summaryrefslogtreecommitdiffstats
path: root/drivers/tty
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2013-09-03 11:38:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-09-03 11:38:36 -0700
commit2f01ea908bcf838e815c0124b579513dbda3b8c8 (patch)
treef42db47c1695daaf369f08a21b2267d4a8ece756 /drivers/tty
parent751144271f4b63d5de9005ea4e5e6e5c7c6fd629 (diff)
parent2d1d3f3ae985ec5676fb56ff2c7acad2e1c4e6eb (diff)
downloadop-kernel-dev-2f01ea908bcf838e815c0124b579513dbda3b8c8.zip
op-kernel-dev-2f01ea908bcf838e815c0124b579513dbda3b8c8.tar.gz
Merge tag 'tty-3.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Pull tty/serial driver patches from Greg KH: "Here's the big tty/serial driver pull request for 3.12-rc1. Lots of n_tty reworks to resolve some very long-standing issues, removing the 3-4 different locks that were taken for every character. This code has been beaten on for a long time in linux-next with no reported regressions. Other than that, a range of serial and tty driver updates and revisions. Full details in the shortlog" * tag 'tty-3.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (226 commits) hvc_xen: Remove unnecessary __GFP_ZERO from kzalloc serial: imx: initialize the local variable tty: ar933x_uart: add device tree support and binding documentation tty: ar933x_uart: allow to build the driver as a module ARM: dts: msm: Update uartdm compatible strings devicetree: serial: Document msm_serial bindings serial: unify serial bindings into a single dir serial: fsl-imx-uart: Cleanup duplicate device tree binding tty: ar933x_uart: use config_enabled() macro to clean up ifdefs tty: ar933x_uart: remove superfluous assignment of ar933x_uart_driver.nr tty: ar933x_uart: use the clk API to get the uart clock tty: serial: cpm_uart: Adding proper request of GPIO used by cpm_uart driver serial: sirf: fix the amount of serial ports serial: sirf: define macro for some magic numbers of USP serial: icom: move array overflow checks earlier TTY: amiserial, remove unnecessary platform_set_drvdata() serial: st-asc: remove unnecessary platform_set_drvdata() msm_serial: Send more than 1 character on the console w/ UARTDM msm_serial: Add support for non-GSBI UARTDM devices msm_serial: Switch clock consumer strings and simplify code ...
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/amiserial.c2
-rw-r--r--drivers/tty/hvc/hvc_console.c11
-rw-r--r--drivers/tty/hvc/hvc_console.h3
-rw-r--r--drivers/tty/hvc/hvc_iucv.c64
-rw-r--r--drivers/tty/hvc/hvc_xen.c6
-rw-r--r--drivers/tty/n_gsm.c29
-rw-r--r--drivers/tty/n_tty.c1414
-rw-r--r--drivers/tty/pty.c18
-rw-r--r--drivers/tty/serial/8250/8250_core.c2
-rw-r--r--drivers/tty/serial/8250/8250_dw.c34
-rw-r--r--drivers/tty/serial/8250/8250_early.c2
-rw-r--r--drivers/tty/serial/8250/8250_em.c27
-rw-r--r--drivers/tty/serial/8250/8250_pci.c15
-rw-r--r--drivers/tty/serial/8250/Kconfig2
-rw-r--r--drivers/tty/serial/Kconfig33
-rw-r--r--drivers/tty/serial/Makefile1
-rw-r--r--drivers/tty/serial/altera_jtaguart.c5
-rw-r--r--drivers/tty/serial/altera_uart.c4
-rw-r--r--drivers/tty/serial/amba-pl010.c2
-rw-r--r--drivers/tty/serial/amba-pl011.c18
-rw-r--r--drivers/tty/serial/apbuart.c2
-rw-r--r--drivers/tty/serial/ar933x_uart.c111
-rw-r--r--drivers/tty/serial/arc_uart.c35
-rw-r--r--drivers/tty/serial/atmel_serial.c857
-rw-r--r--drivers/tty/serial/bcm63xx_uart.c3
-rw-r--r--drivers/tty/serial/bfin_sport_uart.c14
-rw-r--r--drivers/tty/serial/bfin_uart.c21
-rw-r--r--drivers/tty/serial/clps711x.c11
-rw-r--r--drivers/tty/serial/cpm_uart/cpm_uart_core.c28
-rw-r--r--drivers/tty/serial/efm32-uart.c29
-rw-r--r--drivers/tty/serial/fsl_lpuart.c7
-rw-r--r--drivers/tty/serial/icom.c103
-rw-r--r--drivers/tty/serial/ifx6x60.c2
-rw-r--r--drivers/tty/serial/imx.c520
-rw-r--r--drivers/tty/serial/ioc4_serial.c4
-rw-r--r--drivers/tty/serial/lantiq.c7
-rw-r--r--drivers/tty/serial/lpc32xx_hs.c7
-rw-r--r--drivers/tty/serial/m32r_sio.c3
-rw-r--r--drivers/tty/serial/max3100.c2
-rw-r--r--drivers/tty/serial/max310x.c991
-rw-r--r--drivers/tty/serial/mcf.c5
-rw-r--r--drivers/tty/serial/mfd.c14
-rw-r--r--drivers/tty/serial/mpsc.c15
-rw-r--r--drivers/tty/serial/mrst_max3110.c4
-rw-r--r--drivers/tty/serial/msm_serial.c276
-rw-r--r--drivers/tty/serial/msm_serial.h19
-rw-r--r--drivers/tty/serial/msm_serial_hs.c2
-rw-r--r--drivers/tty/serial/mxs-auart.c16
-rw-r--r--drivers/tty/serial/netx-serial.c8
-rw-r--r--drivers/tty/serial/nwpserial.c3
-rw-r--r--drivers/tty/serial/omap-serial.c214
-rw-r--r--drivers/tty/serial/pch_uart.c84
-rw-r--r--drivers/tty/serial/pmac_zilog.c1
-rw-r--r--drivers/tty/serial/pnx8xxx_uart.c5
-rw-r--r--drivers/tty/serial/pxa.c33
-rw-r--r--drivers/tty/serial/rp2.c2
-rw-r--r--drivers/tty/serial/sa1100.c5
-rw-r--r--drivers/tty/serial/samsung.c9
-rw-r--r--drivers/tty/serial/samsung.h3
-rw-r--r--drivers/tty/serial/sc26xx.c2
-rw-r--r--drivers/tty/serial/sccnxp.c339
-rw-r--r--drivers/tty/serial/serial-tegra.c16
-rw-r--r--drivers/tty/serial/serial_core.c4
-rw-r--r--drivers/tty/serial/serial_txx9.c2
-rw-r--r--drivers/tty/serial/sh-sci.c4
-rw-r--r--drivers/tty/serial/sirfsoc_uart.c1195
-rw-r--r--drivers/tty/serial/sirfsoc_uart.h501
-rw-r--r--drivers/tty/serial/st-asc.c932
-rw-r--r--drivers/tty/serial/timbuart.c4
-rw-r--r--drivers/tty/serial/vr41xx_siu.c2
-rw-r--r--drivers/tty/serial/vt8500_serial.c3
-rw-r--r--drivers/tty/synclink.c130
-rw-r--r--drivers/tty/tty_buffer.c417
-rw-r--r--drivers/tty/tty_io.c33
-rw-r--r--drivers/tty/tty_ioctl.c90
-rw-r--r--drivers/tty/tty_ldisc.c461
-rw-r--r--drivers/tty/vt/keyboard.c21
-rw-r--r--drivers/tty/vt/selection.c8
-rw-r--r--drivers/tty/vt/vt.c8
79 files changed, 6422 insertions, 2917 deletions
diff --git a/drivers/tty/amiserial.c b/drivers/tty/amiserial.c
index 083710e..2b86f8e 100644
--- a/drivers/tty/amiserial.c
+++ b/drivers/tty/amiserial.c
@@ -1785,8 +1785,6 @@ static int __exit amiga_serial_remove(struct platform_device *pdev)
free_irq(IRQ_AMIGA_TBE, state);
free_irq(IRQ_AMIGA_RBF, state);
- platform_set_drvdata(pdev, NULL);
-
return error;
}
diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c
index eb255e8..9eba119 100644
--- a/drivers/tty/hvc/hvc_console.c
+++ b/drivers/tty/hvc/hvc_console.c
@@ -361,7 +361,12 @@ static int hvc_open(struct tty_struct *tty, struct file * filp)
tty->driver_data = NULL;
tty_port_put(&hp->port);
printk(KERN_ERR "hvc_open: request_irq failed with rc %d.\n", rc);
- }
+ } else
+ /* We are ready... raise DTR/RTS */
+ if (C_BAUD(tty))
+ if (hp->ops->dtr_rts)
+ hp->ops->dtr_rts(hp, 1);
+
/* Force wakeup of the polling thread */
hvc_kick();
@@ -393,6 +398,10 @@ static void hvc_close(struct tty_struct *tty, struct file * filp)
/* We are done with the tty pointer now. */
tty_port_tty_set(&hp->port, NULL);
+ if (C_HUPCL(tty))
+ if (hp->ops->dtr_rts)
+ hp->ops->dtr_rts(hp, 0);
+
if (hp->ops->notifier_del)
hp->ops->notifier_del(hp, hp->data);
diff --git a/drivers/tty/hvc/hvc_console.h b/drivers/tty/hvc/hvc_console.h
index 674d23c..9131019 100644
--- a/drivers/tty/hvc/hvc_console.h
+++ b/drivers/tty/hvc/hvc_console.h
@@ -75,6 +75,9 @@ struct hv_ops {
/* tiocmget/set implementation */
int (*tiocmget)(struct hvc_struct *hp);
int (*tiocmset)(struct hvc_struct *hp, unsigned int set, unsigned int clear);
+
+ /* Callbacks to handle tty ports */
+ void (*dtr_rts)(struct hvc_struct *hp, int raise);
};
/* Register a vterm and a slot index for use as a console (console_init) */
diff --git a/drivers/tty/hvc/hvc_iucv.c b/drivers/tty/hvc/hvc_iucv.c
index 9d47f50..fd17a9b 100644
--- a/drivers/tty/hvc/hvc_iucv.c
+++ b/drivers/tty/hvc/hvc_iucv.c
@@ -656,21 +656,64 @@ static void hvc_iucv_notifier_hangup(struct hvc_struct *hp, int id)
}
/**
+ * hvc_iucv_dtr_rts() - HVC notifier for handling DTR/RTS
+ * @hp: Pointer the HVC device (struct hvc_struct)
+ * @raise: Non-zero to raise or zero to lower DTR/RTS lines
+ *
+ * This routine notifies the HVC back-end to raise or lower DTR/RTS
+ * lines. Raising DTR/RTS is ignored. Lowering DTR/RTS indicates to
+ * drop the IUCV connection (similar to hang up the modem).
+ */
+static void hvc_iucv_dtr_rts(struct hvc_struct *hp, int raise)
+{
+ struct hvc_iucv_private *priv;
+ struct iucv_path *path;
+
+ /* Raising the DTR/RTS is ignored as IUCV connections can be
+ * established at any times.
+ */
+ if (raise)
+ return;
+
+ priv = hvc_iucv_get_private(hp->vtermno);
+ if (!priv)
+ return;
+
+ /* Lowering the DTR/RTS lines disconnects an established IUCV
+ * connection.
+ */
+ flush_sndbuf_sync(priv);
+
+ spin_lock_bh(&priv->lock);
+ path = priv->path; /* save reference to IUCV path */
+ priv->path = NULL;
+ priv->iucv_state = IUCV_DISCONN;
+ spin_unlock_bh(&priv->lock);
+
+ /* Sever IUCV path outside of priv->lock due to lock ordering of:
+ * priv->lock <--> iucv_table_lock */
+ if (path) {
+ iucv_path_sever(path, NULL);
+ iucv_path_free(path);
+ }
+}
+
+/**
* hvc_iucv_notifier_del() - HVC notifier for closing a TTY for the last time.
* @hp: Pointer to the HVC device (struct hvc_struct)
* @id: Additional data (originally passed to hvc_alloc):
* the index of an struct hvc_iucv_private instance.
*
* This routine notifies the HVC back-end that the last tty device fd has been
- * closed. The function calls hvc_iucv_cleanup() to clean up the struct
- * hvc_iucv_private instance.
+ * closed. The function cleans up tty resources. The clean-up of the IUCV
+ * connection is done in hvc_iucv_dtr_rts() and depends on the HUPCL termios
+ * control setting.
*
* Locking: struct hvc_iucv_private->lock
*/
static void hvc_iucv_notifier_del(struct hvc_struct *hp, int id)
{
struct hvc_iucv_private *priv;
- struct iucv_path *path;
priv = hvc_iucv_get_private(id);
if (!priv)
@@ -679,17 +722,11 @@ static void hvc_iucv_notifier_del(struct hvc_struct *hp, int id)
flush_sndbuf_sync(priv);
spin_lock_bh(&priv->lock);
- path = priv->path; /* save reference to IUCV path */
- priv->path = NULL;
- hvc_iucv_cleanup(priv);
+ destroy_tty_buffer_list(&priv->tty_outqueue);
+ destroy_tty_buffer_list(&priv->tty_inqueue);
+ priv->tty_state = TTY_CLOSED;
+ priv->sndbuf_len = 0;
spin_unlock_bh(&priv->lock);
-
- /* sever IUCV path outside of priv->lock due to lock ordering of:
- * priv->lock <--> iucv_table_lock */
- if (path) {
- iucv_path_sever(path, NULL);
- iucv_path_free(path);
- }
}
/**
@@ -931,6 +968,7 @@ static const struct hv_ops hvc_iucv_ops = {
.notifier_add = hvc_iucv_notifier_add,
.notifier_del = hvc_iucv_notifier_del,
.notifier_hangup = hvc_iucv_notifier_hangup,
+ .dtr_rts = hvc_iucv_dtr_rts,
};
/* Suspend / resume device operations */
diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c
index 682210d..e61c36c 100644
--- a/drivers/tty/hvc/hvc_xen.c
+++ b/drivers/tty/hvc/hvc_xen.c
@@ -208,7 +208,7 @@ static int xen_hvm_console_init(void)
info = vtermno_to_xencons(HVC_COOKIE);
if (!info) {
- info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL | __GFP_ZERO);
+ info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL);
if (!info)
return -ENOMEM;
} else if (info->intf != NULL) {
@@ -257,7 +257,7 @@ static int xen_pv_console_init(void)
info = vtermno_to_xencons(HVC_COOKIE);
if (!info) {
- info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL | __GFP_ZERO);
+ info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL);
if (!info)
return -ENOMEM;
} else if (info->intf != NULL) {
@@ -284,7 +284,7 @@ static int xen_initial_domain_console_init(void)
info = vtermno_to_xencons(HVC_COOKIE);
if (!info) {
- info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL | __GFP_ZERO);
+ info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL);
if (!info)
return -ENOMEM;
}
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 6422390..c0f76da 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -807,7 +807,7 @@ static int gsm_dlci_data_output(struct gsm_mux *gsm, struct gsm_dlci *dlci)
int h = dlci->adaption - 1;
total_size = 0;
- while(1) {
+ while (1) {
len = kfifo_len(dlci->fifo);
if (len == 0)
return total_size;
@@ -827,8 +827,8 @@ static int gsm_dlci_data_output(struct gsm_mux *gsm, struct gsm_dlci *dlci)
switch (dlci->adaption) {
case 1: /* Unstructured */
break;
- case 2: /* Unstructed with modem bits. Always one byte as we never
- send inline break data */
+ case 2: /* Unstructed with modem bits.
+ Always one byte as we never send inline break data */
*dp++ = gsm_encode_modem(dlci);
break;
}
@@ -968,7 +968,7 @@ static void gsm_dlci_data_kick(struct gsm_dlci *dlci)
unsigned long flags;
int sweep;
- if (dlci->constipated)
+ if (dlci->constipated)
return;
spin_lock_irqsave(&dlci->gsm->tx_lock, flags);
@@ -981,7 +981,7 @@ static void gsm_dlci_data_kick(struct gsm_dlci *dlci)
gsm_dlci_data_output(dlci->gsm, dlci);
}
if (sweep)
- gsm_dlci_data_sweep(dlci->gsm);
+ gsm_dlci_data_sweep(dlci->gsm);
spin_unlock_irqrestore(&dlci->gsm->tx_lock, flags);
}
@@ -1138,7 +1138,7 @@ static void gsm_control_modem(struct gsm_mux *gsm, u8 *data, int clen)
static void gsm_control_rls(struct gsm_mux *gsm, u8 *data, int clen)
{
struct tty_port *port;
- unsigned int addr = 0 ;
+ unsigned int addr = 0;
u8 bits;
int len = clen;
u8 *dp = data;
@@ -1740,10 +1740,11 @@ static void gsm_queue(struct gsm_mux *gsm)
if ((gsm->control & ~PF) == UI)
gsm->fcs = gsm_fcs_add_block(gsm->fcs, gsm->buf, gsm->len);
- if (gsm->encoding == 0){
- /* WARNING: gsm->received_fcs is used for gsm->encoding = 0 only.
- In this case it contain the last piece of data
- required to generate final CRC */
+ if (gsm->encoding == 0) {
+ /* WARNING: gsm->received_fcs is used for
+ gsm->encoding = 0 only.
+ In this case it contain the last piece of data
+ required to generate final CRC */
gsm->fcs = gsm_fcs_add(gsm->fcs, gsm->received_fcs);
}
if (gsm->fcs != GOOD_FCS) {
@@ -2904,9 +2905,11 @@ static int gsmtty_install(struct tty_driver *driver, struct tty_struct *tty)
gsm = gsm_mux[mux];
if (gsm->dead)
return -EL2HLT;
- /* If DLCI 0 is not yet fully open return an error. This is ok from a locking
- perspective as we don't have to worry about this if DLCI0 is lost */
- if (gsm->dlci[0] && gsm->dlci[0]->state != DLCI_OPEN)
+ /* If DLCI 0 is not yet fully open return an error.
+ This is ok from a locking
+ perspective as we don't have to worry about this
+ if DLCI0 is lost */
+ if (gsm->dlci[0] && gsm->dlci[0]->state != DLCI_OPEN)
return -EL2NSYNC;
dlci = gsm->dlci[line];
if (dlci == NULL) {
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 4bf0fc0..c9a9ddd 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -50,6 +50,7 @@
#include <linux/uaccess.h>
#include <linux/module.h>
#include <linux/ratelimit.h>
+#include <linux/vmalloc.h>
/* number of characters left in xmit buffer before select has we have room */
@@ -74,37 +75,81 @@
#define ECHO_OP_SET_CANON_COL 0x81
#define ECHO_OP_ERASE_TAB 0x82
+#define ECHO_COMMIT_WATERMARK 256
+#define ECHO_BLOCK 256
+#define ECHO_DISCARD_WATERMARK N_TTY_BUF_SIZE - (ECHO_BLOCK + 32)
+
+
+#undef N_TTY_TRACE
+#ifdef N_TTY_TRACE
+# define n_tty_trace(f, args...) trace_printk(f, ##args)
+#else
+# define n_tty_trace(f, args...)
+#endif
+
struct n_tty_data {
- unsigned int column;
+ /* producer-published */
+ size_t read_head;
+ size_t canon_head;
+ size_t echo_head;
+ size_t echo_commit;
+ DECLARE_BITMAP(char_map, 256);
+
+ /* private to n_tty_receive_overrun (single-threaded) */
unsigned long overrun_time;
int num_overrun;
+ /* non-atomic */
+ bool no_room;
+
+ /* must hold exclusive termios_rwsem to reset these */
unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
- unsigned char echo_overrun:1;
- DECLARE_BITMAP(process_char_map, 256);
+ /* shared by producer and consumer */
+ char read_buf[N_TTY_BUF_SIZE];
DECLARE_BITMAP(read_flags, N_TTY_BUF_SIZE);
+ unsigned char echo_buf[N_TTY_BUF_SIZE];
- char *read_buf;
- int read_head;
- int read_tail;
- int read_cnt;
int minimum_to_wake;
- unsigned char *echo_buf;
- unsigned int echo_pos;
- unsigned int echo_cnt;
+ /* consumer-published */
+ size_t read_tail;
+ size_t line_start;
- int canon_data;
- unsigned long canon_head;
+ /* protected by output lock */
+ unsigned int column;
unsigned int canon_column;
+ size_t echo_tail;
struct mutex atomic_read_lock;
struct mutex output_lock;
- struct mutex echo_lock;
- raw_spinlock_t read_lock;
};
+static inline size_t read_cnt(struct n_tty_data *ldata)
+{
+ return ldata->read_head - ldata->read_tail;
+}
+
+static inline unsigned char read_buf(struct n_tty_data *ldata, size_t i)
+{
+ return ldata->read_buf[i & (N_TTY_BUF_SIZE - 1)];
+}
+
+static inline unsigned char *read_buf_addr(struct n_tty_data *ldata, size_t i)
+{
+ return &ldata->read_buf[i & (N_TTY_BUF_SIZE - 1)];
+}
+
+static inline unsigned char echo_buf(struct n_tty_data *ldata, size_t i)
+{
+ return ldata->echo_buf[i & (N_TTY_BUF_SIZE - 1)];
+}
+
+static inline unsigned char *echo_buf_addr(struct n_tty_data *ldata, size_t i)
+{
+ return &ldata->echo_buf[i & (N_TTY_BUF_SIZE - 1)];
+}
+
static inline int tty_put_user(struct tty_struct *tty, unsigned char x,
unsigned char __user *ptr)
{
@@ -114,33 +159,18 @@ static inline int tty_put_user(struct tty_struct *tty, unsigned char x,
return put_user(x, ptr);
}
-/**
- * n_tty_set_room - receive space
- * @tty: terminal
- *
- * Updates tty->receive_room to reflect the currently available space
- * in the input buffer, and re-schedules the flip buffer work if space
- * just became available.
- *
- * Locks: Concurrent update is protected with read_lock
- */
-
-static int set_room(struct tty_struct *tty)
+static int receive_room(struct tty_struct *tty)
{
struct n_tty_data *ldata = tty->disc_data;
int left;
- int old_left;
- unsigned long flags;
-
- raw_spin_lock_irqsave(&ldata->read_lock, flags);
if (I_PARMRK(tty)) {
/* Multiply read_cnt by 3, since each byte might take up to
* three times as many spaces when PARMRK is set (depending on
* its flags, e.g. parity error). */
- left = N_TTY_BUF_SIZE - ldata->read_cnt * 3 - 1;
+ left = N_TTY_BUF_SIZE - read_cnt(ldata) * 3 - 1;
} else
- left = N_TTY_BUF_SIZE - ldata->read_cnt - 1;
+ left = N_TTY_BUF_SIZE - read_cnt(ldata) - 1;
/*
* If we are doing input canonicalization, and there are no
@@ -149,19 +179,31 @@ static int set_room(struct tty_struct *tty)
* characters will be beeped.
*/
if (left <= 0)
- left = ldata->icanon && !ldata->canon_data;
- old_left = tty->receive_room;
- tty->receive_room = left;
+ left = ldata->icanon && ldata->canon_head == ldata->read_tail;
- raw_spin_unlock_irqrestore(&ldata->read_lock, flags);
-
- return left && !old_left;
+ return left;
}
+/**
+ * n_tty_set_room - receive space
+ * @tty: terminal
+ *
+ * Re-schedules the flip buffer work if space just became available.
+ *
+ * Caller holds exclusive termios_rwsem
+ * or
+ * n_tty_read()/consumer path:
+ * holds non-exclusive termios_rwsem
+ */
+
static void n_tty_set_room(struct tty_struct *tty)
{
+ struct n_tty_data *ldata = tty->disc_data;
+
/* Did this open up the receive buffer? We may need to flip */
- if (set_room(tty)) {
+ if (unlikely(ldata->no_room) && receive_room(tty)) {
+ ldata->no_room = 0;
+
WARN_RATELIMIT(tty->port->itty == NULL,
"scheduling with invalid itty\n");
/* see if ldisc has been killed - if so, this means that
@@ -170,17 +212,93 @@ static void n_tty_set_room(struct tty_struct *tty)
*/
WARN_RATELIMIT(test_bit(TTY_LDISC_HALTED, &tty->flags),
"scheduling buffer work for halted ldisc\n");
- schedule_work(&tty->port->buf.work);
+ queue_work(system_unbound_wq, &tty->port->buf.work);
}
}
-static void put_tty_queue_nolock(unsigned char c, struct n_tty_data *ldata)
+static ssize_t chars_in_buffer(struct tty_struct *tty)
+{
+ struct n_tty_data *ldata = tty->disc_data;
+ ssize_t n = 0;
+
+ if (!ldata->icanon)
+ n = read_cnt(ldata);
+ else
+ n = ldata->canon_head - ldata->read_tail;
+ return n;
+}
+
+/**
+ * n_tty_write_wakeup - asynchronous I/O notifier
+ * @tty: tty device
+ *
+ * Required for the ptys, serial driver etc. since processes
+ * that attach themselves to the master and rely on ASYNC
+ * IO must be woken up
+ */
+
+static void n_tty_write_wakeup(struct tty_struct *tty)
{
- if (ldata->read_cnt < N_TTY_BUF_SIZE) {
- ldata->read_buf[ldata->read_head] = c;
- ldata->read_head = (ldata->read_head + 1) & (N_TTY_BUF_SIZE-1);
- ldata->read_cnt++;
+ if (tty->fasync && test_and_clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags))
+ kill_fasync(&tty->fasync, SIGIO, POLL_OUT);
+}
+
+static void n_tty_check_throttle(struct tty_struct *tty)
+{
+ if (tty->driver->type == TTY_DRIVER_TYPE_PTY)
+ return;
+ /*
+ * Check the remaining room for the input canonicalization
+ * mode. We don't want to throttle the driver if we're in
+ * canonical mode and don't have a newline yet!
+ */
+ while (1) {
+ int throttled;
+ tty_set_flow_change(tty, TTY_THROTTLE_SAFE);
+ if (receive_room(tty) >= TTY_THRESHOLD_THROTTLE)
+ break;
+ throttled = tty_throttle_safe(tty);
+ if (!throttled)
+ break;
+ }
+ __tty_set_flow_change(tty, 0);
+}
+
+static void n_tty_check_unthrottle(struct tty_struct *tty)
+{
+ if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
+ tty->link->ldisc->ops->write_wakeup == n_tty_write_wakeup) {
+ if (chars_in_buffer(tty) > TTY_THRESHOLD_UNTHROTTLE)
+ return;
+ if (!tty->count)
+ return;
+ n_tty_set_room(tty);
+ n_tty_write_wakeup(tty->link);
+ wake_up_interruptible_poll(&tty->link->write_wait, POLLOUT);
+ return;
+ }
+
+ /* If there is enough space in the read buffer now, let the
+ * low-level driver know. We use chars_in_buffer() to
+ * check the buffer, as it now knows about canonical mode.
+ * Otherwise, if the driver is throttled and the line is
+ * longer than TTY_THRESHOLD_UNTHROTTLE in canonical mode,
+ * we won't get any more characters.
+ */
+
+ while (1) {
+ int unthrottled;
+ tty_set_flow_change(tty, TTY_UNTHROTTLE_SAFE);
+ if (chars_in_buffer(tty) > TTY_THRESHOLD_UNTHROTTLE)
+ break;
+ if (!tty->count)
+ break;
+ n_tty_set_room(tty);
+ unthrottled = tty_unthrottle_safe(tty);
+ if (!unthrottled)
+ break;
}
+ __tty_set_flow_change(tty, 0);
}
/**
@@ -188,21 +306,19 @@ static void put_tty_queue_nolock(unsigned char c, struct n_tty_data *ldata)
* @c: character
* @ldata: n_tty data
*
- * Add a character to the tty read_buf queue. This is done under the
- * read_lock to serialize character addition and also to protect us
- * against parallel reads or flushes
+ * Add a character to the tty read_buf queue.
+ *
+ * n_tty_receive_buf()/producer path:
+ * caller holds non-exclusive termios_rwsem
+ * modifies read_head
+ *
+ * read_head is only considered 'published' if canonical mode is
+ * not active.
*/
-static void put_tty_queue(unsigned char c, struct n_tty_data *ldata)
+static inline void put_tty_queue(unsigned char c, struct n_tty_data *ldata)
{
- unsigned long flags;
- /*
- * The problem of stomping on the buffers ends here.
- * Why didn't anyone see this one coming? --AJK
- */
- raw_spin_lock_irqsave(&ldata->read_lock, flags);
- put_tty_queue_nolock(c, ldata);
- raw_spin_unlock_irqrestore(&ldata->read_lock, flags);
+ *read_buf_addr(ldata, ldata->read_head++) = c;
}
/**
@@ -212,22 +328,17 @@ static void put_tty_queue(unsigned char c, struct n_tty_data *ldata)
* Reset the read buffer counters and clear the flags.
* Called from n_tty_open() and n_tty_flush_buffer().
*
- * Locking: tty_read_lock for read fields.
+ * Locking: caller holds exclusive termios_rwsem
+ * (or locking is not required)
*/
static void reset_buffer_flags(struct n_tty_data *ldata)
{
- unsigned long flags;
+ ldata->read_head = ldata->canon_head = ldata->read_tail = 0;
+ ldata->echo_head = ldata->echo_tail = ldata->echo_commit = 0;
+ ldata->line_start = 0;
- raw_spin_lock_irqsave(&ldata->read_lock, flags);
- ldata->read_head = ldata->read_tail = ldata->read_cnt = 0;
- raw_spin_unlock_irqrestore(&ldata->read_lock, flags);
-
- mutex_lock(&ldata->echo_lock);
- ldata->echo_pos = ldata->echo_cnt = ldata->echo_overrun = 0;
- mutex_unlock(&ldata->echo_lock);
-
- ldata->canon_head = ldata->canon_data = ldata->erasing = 0;
+ ldata->erasing = 0;
bitmap_zero(ldata->read_flags, N_TTY_BUF_SIZE);
}
@@ -251,16 +362,21 @@ static void n_tty_packet_mode_flush(struct tty_struct *tty)
* buffer flushed (eg at hangup) or when the N_TTY line discipline
* internally has to clean the pending queue (for example some signals).
*
- * Locking: ctrl_lock, read_lock.
+ * Holds termios_rwsem to exclude producer/consumer while
+ * buffer indices are reset.
+ *
+ * Locking: ctrl_lock, exclusive termios_rwsem
*/
static void n_tty_flush_buffer(struct tty_struct *tty)
{
+ down_write(&tty->termios_rwsem);
reset_buffer_flags(tty->disc_data);
n_tty_set_room(tty);
if (tty->link)
n_tty_packet_mode_flush(tty);
+ up_write(&tty->termios_rwsem);
}
/**
@@ -270,24 +386,18 @@ static void n_tty_flush_buffer(struct tty_struct *tty)
* Report the number of characters buffered to be delivered to user
* at this instant in time.
*
- * Locking: read_lock
+ * Locking: exclusive termios_rwsem
*/
static ssize_t n_tty_chars_in_buffer(struct tty_struct *tty)
{
- struct n_tty_data *ldata = tty->disc_data;
- unsigned long flags;
- ssize_t n = 0;
+ ssize_t n;
- raw_spin_lock_irqsave(&ldata->read_lock, flags);
- if (!ldata->icanon) {
- n = ldata->read_cnt;
- } else if (ldata->canon_data) {
- n = (ldata->canon_head > ldata->read_tail) ?
- ldata->canon_head - ldata->read_tail :
- ldata->canon_head + (N_TTY_BUF_SIZE - ldata->read_tail);
- }
- raw_spin_unlock_irqrestore(&ldata->read_lock, flags);
+ WARN_ONCE(1, "%s is deprecated and scheduled for removal.", __func__);
+
+ down_write(&tty->termios_rwsem);
+ n = chars_in_buffer(tty);
+ up_write(&tty->termios_rwsem);
return n;
}
@@ -532,33 +642,23 @@ break_out:
* are prioritized. Also, when control characters are echoed with a
* prefixed "^", the pair is treated atomically and thus not separated.
*
- * Locking: output_lock to protect column state and space left,
- * echo_lock to protect the echo buffer
+ * Locking: callers must hold output_lock
*/
-static void process_echoes(struct tty_struct *tty)
+static size_t __process_echoes(struct tty_struct *tty)
{
struct n_tty_data *ldata = tty->disc_data;
- int space, nr;
+ int space, old_space;
+ size_t tail;
unsigned char c;
- unsigned char *cp, *buf_end;
-
- if (!ldata->echo_cnt)
- return;
-
- mutex_lock(&ldata->output_lock);
- mutex_lock(&ldata->echo_lock);
- space = tty_write_room(tty);
+ old_space = space = tty_write_room(tty);
- buf_end = ldata->echo_buf + N_TTY_BUF_SIZE;
- cp = ldata->echo_buf + ldata->echo_pos;
- nr = ldata->echo_cnt;
- while (nr > 0) {
- c = *cp;
+ tail = ldata->echo_tail;
+ while (ldata->echo_commit != tail) {
+ c = echo_buf(ldata, tail);
if (c == ECHO_OP_START) {
unsigned char op;
- unsigned char *opp;
int no_space_left = 0;
/*
@@ -566,18 +666,13 @@ static void process_echoes(struct tty_struct *tty)
* operation, get the next byte, which is either the
* op code or a control character value.
*/
- opp = cp + 1;
- if (opp == buf_end)
- opp -= N_TTY_BUF_SIZE;
- op = *opp;
+ op = echo_buf(ldata, tail + 1);
switch (op) {
unsigned int num_chars, num_bs;
case ECHO_OP_ERASE_TAB:
- if (++opp == buf_end)
- opp -= N_TTY_BUF_SIZE;
- num_chars = *opp;
+ num_chars = echo_buf(ldata, tail + 2);
/*
* Determine how many columns to go back
@@ -603,21 +698,18 @@ static void process_echoes(struct tty_struct *tty)
if (ldata->column > 0)
ldata->column--;
}
- cp += 3;
- nr -= 3;
+ tail += 3;
break;
case ECHO_OP_SET_CANON_COL:
ldata->canon_column = ldata->column;
- cp += 2;
- nr -= 2;
+ tail += 2;
break;
case ECHO_OP_MOVE_BACK_COL:
if (ldata->column > 0)
ldata->column--;
- cp += 2;
- nr -= 2;
+ tail += 2;
break;
case ECHO_OP_START:
@@ -629,8 +721,7 @@ static void process_echoes(struct tty_struct *tty)
tty_put_char(tty, ECHO_OP_START);
ldata->column++;
space--;
- cp += 2;
- nr -= 2;
+ tail += 2;
break;
default:
@@ -651,8 +742,7 @@ static void process_echoes(struct tty_struct *tty)
tty_put_char(tty, op ^ 0100);
ldata->column += 2;
space -= 2;
- cp += 2;
- nr -= 2;
+ tail += 2;
}
if (no_space_left)
@@ -669,80 +759,92 @@ static void process_echoes(struct tty_struct *tty)
tty_put_char(tty, c);
space -= 1;
}
- cp += 1;
- nr -= 1;
+ tail += 1;
}
-
- /* When end of circular buffer reached, wrap around */
- if (cp >= buf_end)
- cp -= N_TTY_BUF_SIZE;
}
- if (nr == 0) {
- ldata->echo_pos = 0;
- ldata->echo_cnt = 0;
- ldata->echo_overrun = 0;
- } else {
- int num_processed = ldata->echo_cnt - nr;
- ldata->echo_pos += num_processed;
- ldata->echo_pos &= N_TTY_BUF_SIZE - 1;
- ldata->echo_cnt = nr;
- if (num_processed > 0)
- ldata->echo_overrun = 0;
+ /* If the echo buffer is nearly full (so that the possibility exists
+ * of echo overrun before the next commit), then discard enough
+ * data at the tail to prevent a subsequent overrun */
+ while (ldata->echo_commit - tail >= ECHO_DISCARD_WATERMARK) {
+ if (echo_buf(ldata, tail == ECHO_OP_START)) {
+ if (echo_buf(ldata, tail) == ECHO_OP_ERASE_TAB)
+ tail += 3;
+ else
+ tail += 2;
+ } else
+ tail++;
}
- mutex_unlock(&ldata->echo_lock);
+ ldata->echo_tail = tail;
+ return old_space - space;
+}
+
+static void commit_echoes(struct tty_struct *tty)
+{
+ struct n_tty_data *ldata = tty->disc_data;
+ size_t nr, old, echoed;
+ size_t head;
+
+ head = ldata->echo_head;
+ old = ldata->echo_commit - ldata->echo_tail;
+
+ /* Process committed echoes if the accumulated # of bytes
+ * is over the threshold (and try again each time another
+ * block is accumulated) */
+ nr = head - ldata->echo_tail;
+ if (nr < ECHO_COMMIT_WATERMARK || (nr % ECHO_BLOCK > old % ECHO_BLOCK))
+ return;
+
+ mutex_lock(&ldata->output_lock);
+ ldata->echo_commit = head;
+ echoed = __process_echoes(tty);
+ mutex_unlock(&ldata->output_lock);
+
+ if (echoed && tty->ops->flush_chars)
+ tty->ops->flush_chars(tty);
+}
+
+static void process_echoes(struct tty_struct *tty)
+{
+ struct n_tty_data *ldata = tty->disc_data;
+ size_t echoed;
+
+ if (!L_ECHO(tty) || ldata->echo_commit == ldata->echo_tail)
+ return;
+
+ mutex_lock(&ldata->output_lock);
+ echoed = __process_echoes(tty);
mutex_unlock(&ldata->output_lock);
- if (tty->ops->flush_chars)
+ if (echoed && tty->ops->flush_chars)
tty->ops->flush_chars(tty);
}
+static void flush_echoes(struct tty_struct *tty)
+{
+ struct n_tty_data *ldata = tty->disc_data;
+
+ if (!L_ECHO(tty) || ldata->echo_commit == ldata->echo_head)
+ return;
+
+ mutex_lock(&ldata->output_lock);
+ ldata->echo_commit = ldata->echo_head;
+ __process_echoes(tty);
+ mutex_unlock(&ldata->output_lock);
+}
+
/**
* add_echo_byte - add a byte to the echo buffer
* @c: unicode byte to echo
* @ldata: n_tty data
*
* Add a character or operation byte to the echo buffer.
- *
- * Should be called under the echo lock to protect the echo buffer.
*/
-static void add_echo_byte(unsigned char c, struct n_tty_data *ldata)
+static inline void add_echo_byte(unsigned char c, struct n_tty_data *ldata)
{
- int new_byte_pos;
-
- if (ldata->echo_cnt == N_TTY_BUF_SIZE) {
- /* Circular buffer is already at capacity */
- new_byte_pos = ldata->echo_pos;
-
- /*
- * Since the buffer start position needs to be advanced,
- * be sure to step by a whole operation byte group.
- */
- if (ldata->echo_buf[ldata->echo_pos] == ECHO_OP_START) {
- if (ldata->echo_buf[(ldata->echo_pos + 1) &
- (N_TTY_BUF_SIZE - 1)] ==
- ECHO_OP_ERASE_TAB) {
- ldata->echo_pos += 3;
- ldata->echo_cnt -= 2;
- } else {
- ldata->echo_pos += 2;
- ldata->echo_cnt -= 1;
- }
- } else {
- ldata->echo_pos++;
- }
- ldata->echo_pos &= N_TTY_BUF_SIZE - 1;
-
- ldata->echo_overrun = 1;
- } else {
- new_byte_pos = ldata->echo_pos + ldata->echo_cnt;
- new_byte_pos &= N_TTY_BUF_SIZE - 1;
- ldata->echo_cnt++;
- }
-
- ldata->echo_buf[new_byte_pos] = c;
+ *echo_buf_addr(ldata, ldata->echo_head++) = c;
}
/**
@@ -750,16 +852,12 @@ static void add_echo_byte(unsigned char c, struct n_tty_data *ldata)
* @ldata: n_tty data
*
* Add an operation to the echo buffer to move back one column.
- *
- * Locking: echo_lock to protect the echo buffer
*/
static void echo_move_back_col(struct n_tty_data *ldata)
{
- mutex_lock(&ldata->echo_lock);
add_echo_byte(ECHO_OP_START, ldata);
add_echo_byte(ECHO_OP_MOVE_BACK_COL, ldata);
- mutex_unlock(&ldata->echo_lock);
}
/**
@@ -768,16 +866,12 @@ static void echo_move_back_col(struct n_tty_data *ldata)
*
* Add an operation to the echo buffer to set the canon column
* to the current column.
- *
- * Locking: echo_lock to protect the echo buffer
*/
static void echo_set_canon_col(struct n_tty_data *ldata)
{
- mutex_lock(&ldata->echo_lock);
add_echo_byte(ECHO_OP_START, ldata);
add_echo_byte(ECHO_OP_SET_CANON_COL, ldata);
- mutex_unlock(&ldata->echo_lock);
}
/**
@@ -793,15 +887,11 @@ static void echo_set_canon_col(struct n_tty_data *ldata)
* of input. This information will be used later, along with
* canon column (if applicable), to go back the correct number
* of columns.
- *
- * Locking: echo_lock to protect the echo buffer
*/
static void echo_erase_tab(unsigned int num_chars, int after_tab,
struct n_tty_data *ldata)
{
- mutex_lock(&ldata->echo_lock);
-
add_echo_byte(ECHO_OP_START, ldata);
add_echo_byte(ECHO_OP_ERASE_TAB, ldata);
@@ -813,8 +903,6 @@ static void echo_erase_tab(unsigned int num_chars, int after_tab,
num_chars |= 0x80;
add_echo_byte(num_chars, ldata);
-
- mutex_unlock(&ldata->echo_lock);
}
/**
@@ -826,20 +914,16 @@ static void echo_erase_tab(unsigned int num_chars, int after_tab,
* L_ECHO(tty) is true. Called from the driver receive_buf path.
*
* This variant does not treat control characters specially.
- *
- * Locking: echo_lock to protect the echo buffer
*/
static void echo_char_raw(unsigned char c, struct n_tty_data *ldata)
{
- mutex_lock(&ldata->echo_lock);
if (c == ECHO_OP_START) {
add_echo_byte(ECHO_OP_START, ldata);
add_echo_byte(ECHO_OP_START, ldata);
} else {
add_echo_byte(c, ldata);
}
- mutex_unlock(&ldata->echo_lock);
}
/**
@@ -852,16 +936,12 @@ static void echo_char_raw(unsigned char c, struct n_tty_data *ldata)
*
* This variant tags control characters to be echoed as "^X"
* (where X is the letter representing the control char).
- *
- * Locking: echo_lock to protect the echo buffer
*/
static void echo_char(unsigned char c, struct tty_struct *tty)
{
struct n_tty_data *ldata = tty->disc_data;
- mutex_lock(&ldata->echo_lock);
-
if (c == ECHO_OP_START) {
add_echo_byte(ECHO_OP_START, ldata);
add_echo_byte(ECHO_OP_START, ldata);
@@ -870,8 +950,6 @@ static void echo_char(unsigned char c, struct tty_struct *tty)
add_echo_byte(ECHO_OP_START, ldata);
add_echo_byte(c, ldata);
}
-
- mutex_unlock(&ldata->echo_lock);
}
/**
@@ -896,17 +974,22 @@ static inline void finish_erasing(struct n_tty_data *ldata)
* present in the stream from the driver layer. Handles the complexities
* of UTF-8 multibyte symbols.
*
- * Locking: read_lock for tty buffers
+ * n_tty_receive_buf()/producer path:
+ * caller holds non-exclusive termios_rwsem
+ * modifies read_head
+ *
+ * Modifying the read_head is not considered a publish in this context
+ * because canonical mode is active -- only canon_head publishes
*/
static void eraser(unsigned char c, struct tty_struct *tty)
{
struct n_tty_data *ldata = tty->disc_data;
enum { ERASE, WERASE, KILL } kill_type;
- int head, seen_alnums, cnt;
- unsigned long flags;
+ size_t head;
+ size_t cnt;
+ int seen_alnums;
- /* FIXME: locking needed ? */
if (ldata->read_head == ldata->canon_head) {
/* process_output('\a', tty); */ /* what do you think? */
return;
@@ -917,19 +1000,11 @@ static void eraser(unsigned char c, struct tty_struct *tty)
kill_type = WERASE;
else {
if (!L_ECHO(tty)) {
- raw_spin_lock_irqsave(&ldata->read_lock, flags);
- ldata->read_cnt -= ((ldata->read_head - ldata->canon_head) &
- (N_TTY_BUF_SIZE - 1));
ldata->read_head = ldata->canon_head;
- raw_spin_unlock_irqrestore(&ldata->read_lock, flags);
return;
}
if (!L_ECHOK(tty) || !L_ECHOKE(tty) || !L_ECHOE(tty)) {
- raw_spin_lock_irqsave(&ldata->read_lock, flags);
- ldata->read_cnt -= ((ldata->read_head - ldata->canon_head) &
- (N_TTY_BUF_SIZE - 1));
ldata->read_head = ldata->canon_head;
- raw_spin_unlock_irqrestore(&ldata->read_lock, flags);
finish_erasing(ldata);
echo_char(KILL_CHAR(tty), tty);
/* Add a newline if ECHOK is on and ECHOKE is off. */
@@ -941,14 +1016,13 @@ static void eraser(unsigned char c, struct tty_struct *tty)
}
seen_alnums = 0;
- /* FIXME: Locking ?? */
while (ldata->read_head != ldata->canon_head) {
head = ldata->read_head;
/* erase a single possibly multibyte character */
do {
- head = (head - 1) & (N_TTY_BUF_SIZE-1);
- c = ldata->read_buf[head];
+ head--;
+ c = read_buf(ldata, head);
} while (is_continuation(c, tty) && head != ldata->canon_head);
/* do not partially erase */
@@ -962,11 +1036,8 @@ static void eraser(unsigned char c, struct tty_struct *tty)
else if (seen_alnums)
break;
}
- cnt = (ldata->read_head - head) & (N_TTY_BUF_SIZE-1);
- raw_spin_lock_irqsave(&ldata->read_lock, flags);
+ cnt = ldata->read_head - head;
ldata->read_head = head;
- ldata->read_cnt -= cnt;
- raw_spin_unlock_irqrestore(&ldata->read_lock, flags);
if (L_ECHO(tty)) {
if (L_ECHOPRT(tty)) {
if (!ldata->erasing) {
@@ -976,9 +1047,8 @@ static void eraser(unsigned char c, struct tty_struct *tty)
/* if cnt > 1, output a multi-byte character */
echo_char(c, tty);
while (--cnt > 0) {
- head = (head+1) & (N_TTY_BUF_SIZE-1);
- echo_char_raw(ldata->read_buf[head],
- ldata);
+ head++;
+ echo_char_raw(read_buf(ldata, head), ldata);
echo_move_back_col(ldata);
}
} else if (kill_type == ERASE && !L_ECHOE(tty)) {
@@ -986,7 +1056,7 @@ static void eraser(unsigned char c, struct tty_struct *tty)
} else if (c == '\t') {
unsigned int num_chars = 0;
int after_tab = 0;
- unsigned long tail = ldata->read_head;
+ size_t tail = ldata->read_head;
/*
* Count the columns used for characters
@@ -996,8 +1066,8 @@ static void eraser(unsigned char c, struct tty_struct *tty)
* number of columns.
*/
while (tail != ldata->canon_head) {
- tail = (tail-1) & (N_TTY_BUF_SIZE-1);
- c = ldata->read_buf[tail];
+ tail--;
+ c = read_buf(ldata, tail);
if (c == '\t') {
after_tab = 1;
break;
@@ -1040,7 +1110,7 @@ static void eraser(unsigned char c, struct tty_struct *tty)
* Locking: ctrl_lock
*/
-static inline void isig(int sig, struct tty_struct *tty)
+static void isig(int sig, struct tty_struct *tty)
{
struct pid *tty_pgrp = tty_get_pgrp(tty);
if (tty_pgrp) {
@@ -1056,10 +1126,14 @@ static inline void isig(int sig, struct tty_struct *tty)
* An RS232 break event has been hit in the incoming bitstream. This
* can cause a variety of events depending upon the termios settings.
*
- * Called from the receive_buf path so single threaded.
+ * n_tty_receive_buf()/producer path:
+ * caller holds non-exclusive termios_rwsem
+ * publishes read_head via put_tty_queue()
+ *
+ * Note: may get exclusive termios_rwsem if flushing input buffer
*/
-static inline void n_tty_receive_break(struct tty_struct *tty)
+static void n_tty_receive_break(struct tty_struct *tty)
{
struct n_tty_data *ldata = tty->disc_data;
@@ -1068,8 +1142,11 @@ static inline void n_tty_receive_break(struct tty_struct *tty)
if (I_BRKINT(tty)) {
isig(SIGINT, tty);
if (!L_NOFLSH(tty)) {
+ /* flushing needs exclusive termios_rwsem */
+ up_read(&tty->termios_rwsem);
n_tty_flush_buffer(tty);
tty_driver_flush_buffer(tty);
+ down_read(&tty->termios_rwsem);
}
return;
}
@@ -1094,7 +1171,7 @@ static inline void n_tty_receive_break(struct tty_struct *tty)
* private.
*/
-static inline void n_tty_receive_overrun(struct tty_struct *tty)
+static void n_tty_receive_overrun(struct tty_struct *tty)
{
struct n_tty_data *ldata = tty->disc_data;
char buf[64];
@@ -1116,10 +1193,13 @@ static inline void n_tty_receive_overrun(struct tty_struct *tty)
* @c: character
*
* Process a parity error and queue the right data to indicate
- * the error case if necessary. Locking as per n_tty_receive_buf.
+ * the error case if necessary.
+ *
+ * n_tty_receive_buf()/producer path:
+ * caller holds non-exclusive termios_rwsem
+ * publishes read_head via put_tty_queue()
*/
-static inline void n_tty_receive_parity_error(struct tty_struct *tty,
- unsigned char c)
+static void n_tty_receive_parity_error(struct tty_struct *tty, unsigned char c)
{
struct n_tty_data *ldata = tty->disc_data;
@@ -1136,6 +1216,26 @@ static inline void n_tty_receive_parity_error(struct tty_struct *tty,
wake_up_interruptible(&tty->read_wait);
}
+static void
+n_tty_receive_signal_char(struct tty_struct *tty, int signal, unsigned char c)
+{
+ if (!L_NOFLSH(tty)) {
+ /* flushing needs exclusive termios_rwsem */
+ up_read(&tty->termios_rwsem);
+ n_tty_flush_buffer(tty);
+ tty_driver_flush_buffer(tty);
+ down_read(&tty->termios_rwsem);
+ }
+ if (I_IXON(tty))
+ start_tty(tty);
+ if (L_ECHO(tty)) {
+ echo_char(c, tty);
+ commit_echoes(tty);
+ }
+ isig(signal, tty);
+ return;
+}
+
/**
* n_tty_receive_char - perform processing
* @tty: terminal device
@@ -1144,117 +1244,54 @@ static inline void n_tty_receive_parity_error(struct tty_struct *tty,
* Process an individual character of input received from the driver.
* This is serialized with respect to itself by the rules for the
* driver above.
+ *
+ * n_tty_receive_buf()/producer path:
+ * caller holds non-exclusive termios_rwsem
+ * publishes canon_head if canonical mode is active
+ * otherwise, publishes read_head via put_tty_queue()
+ *
+ * Returns 1 if LNEXT was received, else returns 0
*/
-static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
+static int
+n_tty_receive_char_special(struct tty_struct *tty, unsigned char c)
{
struct n_tty_data *ldata = tty->disc_data;
- unsigned long flags;
int parmrk;
- if (ldata->raw) {
- put_tty_queue(c, ldata);
- return;
- }
-
- if (I_ISTRIP(tty))
- c &= 0x7f;
- if (I_IUCLC(tty) && L_IEXTEN(tty))
- c = tolower(c);
-
- if (L_EXTPROC(tty)) {
- put_tty_queue(c, ldata);
- return;
- }
-
- if (tty->stopped && !tty->flow_stopped && I_IXON(tty) &&
- I_IXANY(tty) && c != START_CHAR(tty) && c != STOP_CHAR(tty) &&
- c != INTR_CHAR(tty) && c != QUIT_CHAR(tty) && c != SUSP_CHAR(tty)) {
- start_tty(tty);
- process_echoes(tty);
- }
-
- if (tty->closing) {
- if (I_IXON(tty)) {
- if (c == START_CHAR(tty)) {
- start_tty(tty);
- process_echoes(tty);
- } else if (c == STOP_CHAR(tty))
- stop_tty(tty);
- }
- return;
- }
-
- /*
- * If the previous character was LNEXT, or we know that this
- * character is not one of the characters that we'll have to
- * handle specially, do shortcut processing to speed things
- * up.
- */
- if (!test_bit(c, ldata->process_char_map) || ldata->lnext) {
- ldata->lnext = 0;
- parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty)) ? 1 : 0;
- if (ldata->read_cnt >= (N_TTY_BUF_SIZE - parmrk - 1)) {
- /* beep if no space */
- if (L_ECHO(tty))
- process_output('\a', tty);
- return;
- }
- if (L_ECHO(tty)) {
- finish_erasing(ldata);
- /* Record the column of first canon char. */
- if (ldata->canon_head == ldata->read_head)
- echo_set_canon_col(ldata);
- echo_char(c, tty);
- process_echoes(tty);
- }
- if (parmrk)
- put_tty_queue(c, ldata);
- put_tty_queue(c, ldata);
- return;
- }
-
if (I_IXON(tty)) {
if (c == START_CHAR(tty)) {
start_tty(tty);
- process_echoes(tty);
- return;
+ commit_echoes(tty);
+ return 0;
}
if (c == STOP_CHAR(tty)) {
stop_tty(tty);
- return;
+ return 0;
}
}
if (L_ISIG(tty)) {
- int signal;
- signal = SIGINT;
- if (c == INTR_CHAR(tty))
- goto send_signal;
- signal = SIGQUIT;
- if (c == QUIT_CHAR(tty))
- goto send_signal;
- signal = SIGTSTP;
- if (c == SUSP_CHAR(tty)) {
-send_signal:
- if (!L_NOFLSH(tty)) {
- n_tty_flush_buffer(tty);
- tty_driver_flush_buffer(tty);
- }
- if (I_IXON(tty))
- start_tty(tty);
- if (L_ECHO(tty)) {
- echo_char(c, tty);
- process_echoes(tty);
- }
- isig(signal, tty);
- return;
+ if (c == INTR_CHAR(tty)) {
+ n_tty_receive_signal_char(tty, SIGINT, c);
+ return 0;
+ } else if (c == QUIT_CHAR(tty)) {
+ n_tty_receive_signal_char(tty, SIGQUIT, c);
+ return 0;
+ } else if (c == SUSP_CHAR(tty)) {
+ n_tty_receive_signal_char(tty, SIGTSTP, c);
+ return 0;
}
}
+ if (tty->stopped && !tty->flow_stopped && I_IXON(tty) && I_IXANY(tty)) {
+ start_tty(tty);
+ process_echoes(tty);
+ }
+
if (c == '\r') {
if (I_IGNCR(tty))
- return;
+ return 0;
if (I_ICRNL(tty))
c = '\n';
} else if (c == '\n' && I_INLCR(tty))
@@ -1264,8 +1301,8 @@ send_signal:
if (c == ERASE_CHAR(tty) || c == KILL_CHAR(tty) ||
(c == WERASE_CHAR(tty) && L_IEXTEN(tty))) {
eraser(c, tty);
- process_echoes(tty);
- return;
+ commit_echoes(tty);
+ return 0;
}
if (c == LNEXT_CHAR(tty) && L_IEXTEN(tty)) {
ldata->lnext = 1;
@@ -1274,42 +1311,32 @@ send_signal:
if (L_ECHOCTL(tty)) {
echo_char_raw('^', ldata);
echo_char_raw('\b', ldata);
- process_echoes(tty);
+ commit_echoes(tty);
}
}
- return;
+ return 1;
}
- if (c == REPRINT_CHAR(tty) && L_ECHO(tty) &&
- L_IEXTEN(tty)) {
- unsigned long tail = ldata->canon_head;
+ if (c == REPRINT_CHAR(tty) && L_ECHO(tty) && L_IEXTEN(tty)) {
+ size_t tail = ldata->canon_head;
finish_erasing(ldata);
echo_char(c, tty);
echo_char_raw('\n', ldata);
while (tail != ldata->read_head) {
- echo_char(ldata->read_buf[tail], tty);
- tail = (tail+1) & (N_TTY_BUF_SIZE-1);
+ echo_char(read_buf(ldata, tail), tty);
+ tail++;
}
- process_echoes(tty);
- return;
+ commit_echoes(tty);
+ return 0;
}
if (c == '\n') {
- if (ldata->read_cnt >= N_TTY_BUF_SIZE) {
- if (L_ECHO(tty))
- process_output('\a', tty);
- return;
- }
if (L_ECHO(tty) || L_ECHONL(tty)) {
echo_char_raw('\n', ldata);
- process_echoes(tty);
+ commit_echoes(tty);
}
goto handle_newline;
}
if (c == EOF_CHAR(tty)) {
- if (ldata->read_cnt >= N_TTY_BUF_SIZE)
- return;
- if (ldata->canon_head != ldata->read_head)
- set_bit(TTY_PUSH, &tty->flags);
c = __DISABLED_CHAR;
goto handle_newline;
}
@@ -1317,11 +1344,6 @@ send_signal:
(c == EOL2_CHAR(tty) && L_IEXTEN(tty))) {
parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty))
? 1 : 0;
- if (ldata->read_cnt >= (N_TTY_BUF_SIZE - parmrk)) {
- if (L_ECHO(tty))
- process_output('\a', tty);
- return;
- }
/*
* XXX are EOL_CHAR and EOL2_CHAR echoed?!?
*/
@@ -1330,7 +1352,7 @@ send_signal:
if (ldata->canon_head == ldata->read_head)
echo_set_canon_col(ldata);
echo_char(c, tty);
- process_echoes(tty);
+ commit_echoes(tty);
}
/*
* XXX does PARMRK doubling happen for
@@ -1340,26 +1362,17 @@ send_signal:
put_tty_queue(c, ldata);
handle_newline:
- raw_spin_lock_irqsave(&ldata->read_lock, flags);
- set_bit(ldata->read_head, ldata->read_flags);
- put_tty_queue_nolock(c, ldata);
+ set_bit(ldata->read_head & (N_TTY_BUF_SIZE - 1), ldata->read_flags);
+ put_tty_queue(c, ldata);
ldata->canon_head = ldata->read_head;
- ldata->canon_data++;
- raw_spin_unlock_irqrestore(&ldata->read_lock, flags);
kill_fasync(&tty->fasync, SIGIO, POLL_IN);
if (waitqueue_active(&tty->read_wait))
wake_up_interruptible(&tty->read_wait);
- return;
+ return 0;
}
}
parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty)) ? 1 : 0;
- if (ldata->read_cnt >= (N_TTY_BUF_SIZE - parmrk - 1)) {
- /* beep if no space */
- if (L_ECHO(tty))
- process_output('\a', tty);
- return;
- }
if (L_ECHO(tty)) {
finish_erasing(ldata);
if (c == '\n')
@@ -1370,29 +1383,123 @@ handle_newline:
echo_set_canon_col(ldata);
echo_char(c, tty);
}
- process_echoes(tty);
+ commit_echoes(tty);
}
if (parmrk)
put_tty_queue(c, ldata);
put_tty_queue(c, ldata);
+ return 0;
}
+static inline void
+n_tty_receive_char_inline(struct tty_struct *tty, unsigned char c)
+{
+ struct n_tty_data *ldata = tty->disc_data;
+ int parmrk;
-/**
- * n_tty_write_wakeup - asynchronous I/O notifier
- * @tty: tty device
- *
- * Required for the ptys, serial driver etc. since processes
- * that attach themselves to the master and rely on ASYNC
- * IO must be woken up
- */
+ if (tty->stopped && !tty->flow_stopped && I_IXON(tty) && I_IXANY(tty)) {
+ start_tty(tty);
+ process_echoes(tty);
+ }
+ if (L_ECHO(tty)) {
+ finish_erasing(ldata);
+ /* Record the column of first canon char. */
+ if (ldata->canon_head == ldata->read_head)
+ echo_set_canon_col(ldata);
+ echo_char(c, tty);
+ commit_echoes(tty);
+ }
+ parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty)) ? 1 : 0;
+ if (parmrk)
+ put_tty_queue(c, ldata);
+ put_tty_queue(c, ldata);
+}
-static void n_tty_write_wakeup(struct tty_struct *tty)
+static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
{
- if (tty->fasync && test_and_clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags))
- kill_fasync(&tty->fasync, SIGIO, POLL_OUT);
+ n_tty_receive_char_inline(tty, c);
+}
+
+static inline void
+n_tty_receive_char_fast(struct tty_struct *tty, unsigned char c)
+{
+ struct n_tty_data *ldata = tty->disc_data;
+
+ if (tty->stopped && !tty->flow_stopped && I_IXON(tty) && I_IXANY(tty)) {
+ start_tty(tty);
+ process_echoes(tty);
+ }
+ if (L_ECHO(tty)) {
+ finish_erasing(ldata);
+ /* Record the column of first canon char. */
+ if (ldata->canon_head == ldata->read_head)
+ echo_set_canon_col(ldata);
+ echo_char(c, tty);
+ commit_echoes(tty);
+ }
+ put_tty_queue(c, ldata);
+}
+
+static inline void
+n_tty_receive_char_closing(struct tty_struct *tty, unsigned char c)
+{
+ if (I_ISTRIP(tty))
+ c &= 0x7f;
+ if (I_IUCLC(tty) && L_IEXTEN(tty))
+ c = tolower(c);
+
+ if (I_IXON(tty)) {
+ if (c == STOP_CHAR(tty))
+ stop_tty(tty);
+ else if (c == START_CHAR(tty) ||
+ (tty->stopped && !tty->flow_stopped && I_IXANY(tty) &&
+ c != INTR_CHAR(tty) && c != QUIT_CHAR(tty) &&
+ c != SUSP_CHAR(tty))) {
+ start_tty(tty);
+ process_echoes(tty);
+ }
+ }
+}
+
+static void
+n_tty_receive_char_flagged(struct tty_struct *tty, unsigned char c, char flag)
+{
+ char buf[64];
+
+ switch (flag) {
+ case TTY_BREAK:
+ n_tty_receive_break(tty);
+ break;
+ case TTY_PARITY:
+ case TTY_FRAME:
+ n_tty_receive_parity_error(tty, c);
+ break;
+ case TTY_OVERRUN:
+ n_tty_receive_overrun(tty);
+ break;
+ default:
+ printk(KERN_ERR "%s: unknown flag %d\n",
+ tty_name(tty, buf), flag);
+ break;
+ }
+}
+
+static void
+n_tty_receive_char_lnext(struct tty_struct *tty, unsigned char c, char flag)
+{
+ struct n_tty_data *ldata = tty->disc_data;
+
+ ldata->lnext = 0;
+ if (likely(flag == TTY_NORMAL)) {
+ if (I_ISTRIP(tty))
+ c &= 0x7f;
+ if (I_IUCLC(tty) && L_IEXTEN(tty))
+ c = tolower(c);
+ n_tty_receive_char(tty, c);
+ } else
+ n_tty_receive_char_flagged(tty, c, flag);
}
/**
@@ -1406,86 +1513,220 @@ static void n_tty_write_wakeup(struct tty_struct *tty)
* been received. This function must be called from soft contexts
* not from interrupt context. The driver is responsible for making
* calls one at a time and in order (or using flush_to_ldisc)
+ *
+ * n_tty_receive_buf()/producer path:
+ * claims non-exclusive termios_rwsem
+ * publishes read_head and canon_head
*/
-static void n_tty_receive_buf(struct tty_struct *tty, const unsigned char *cp,
- char *fp, int count)
+static void
+n_tty_receive_buf_real_raw(struct tty_struct *tty, const unsigned char *cp,
+ char *fp, int count)
{
struct n_tty_data *ldata = tty->disc_data;
- const unsigned char *p;
- char *f, flags = TTY_NORMAL;
- int i;
- char buf[64];
- unsigned long cpuflags;
-
- if (ldata->real_raw) {
- raw_spin_lock_irqsave(&ldata->read_lock, cpuflags);
- i = min(N_TTY_BUF_SIZE - ldata->read_cnt,
- N_TTY_BUF_SIZE - ldata->read_head);
- i = min(count, i);
- memcpy(ldata->read_buf + ldata->read_head, cp, i);
- ldata->read_head = (ldata->read_head + i) & (N_TTY_BUF_SIZE-1);
- ldata->read_cnt += i;
- cp += i;
- count -= i;
-
- i = min(N_TTY_BUF_SIZE - ldata->read_cnt,
- N_TTY_BUF_SIZE - ldata->read_head);
- i = min(count, i);
- memcpy(ldata->read_buf + ldata->read_head, cp, i);
- ldata->read_head = (ldata->read_head + i) & (N_TTY_BUF_SIZE-1);
- ldata->read_cnt += i;
- raw_spin_unlock_irqrestore(&ldata->read_lock, cpuflags);
- } else {
- for (i = count, p = cp, f = fp; i; i--, p++) {
- if (f)
- flags = *f++;
- switch (flags) {
- case TTY_NORMAL:
- n_tty_receive_char(tty, *p);
- break;
- case TTY_BREAK:
- n_tty_receive_break(tty);
- break;
- case TTY_PARITY:
- case TTY_FRAME:
- n_tty_receive_parity_error(tty, *p);
- break;
- case TTY_OVERRUN:
- n_tty_receive_overrun(tty);
- break;
- default:
- printk(KERN_ERR "%s: unknown flag %d\n",
- tty_name(tty, buf), flags);
- break;
+ size_t n, head;
+
+ head = ldata->read_head & (N_TTY_BUF_SIZE - 1);
+ n = N_TTY_BUF_SIZE - max(read_cnt(ldata), head);
+ n = min_t(size_t, count, n);
+ memcpy(read_buf_addr(ldata, head), cp, n);
+ ldata->read_head += n;
+ cp += n;
+ count -= n;
+
+ head = ldata->read_head & (N_TTY_BUF_SIZE - 1);
+ n = N_TTY_BUF_SIZE - max(read_cnt(ldata), head);
+ n = min_t(size_t, count, n);
+ memcpy(read_buf_addr(ldata, head), cp, n);
+ ldata->read_head += n;
+}
+
+static void
+n_tty_receive_buf_raw(struct tty_struct *tty, const unsigned char *cp,
+ char *fp, int count)
+{
+ struct n_tty_data *ldata = tty->disc_data;
+ char flag = TTY_NORMAL;
+
+ while (count--) {
+ if (fp)
+ flag = *fp++;
+ if (likely(flag == TTY_NORMAL))
+ put_tty_queue(*cp++, ldata);
+ else
+ n_tty_receive_char_flagged(tty, *cp++, flag);
+ }
+}
+
+static void
+n_tty_receive_buf_closing(struct tty_struct *tty, const unsigned char *cp,
+ char *fp, int count)
+{
+ char flag = TTY_NORMAL;
+
+ while (count--) {
+ if (fp)
+ flag = *fp++;
+ if (likely(flag == TTY_NORMAL))
+ n_tty_receive_char_closing(tty, *cp++);
+ else
+ n_tty_receive_char_flagged(tty, *cp++, flag);
+ }
+}
+
+static void
+n_tty_receive_buf_standard(struct tty_struct *tty, const unsigned char *cp,
+ char *fp, int count)
+{
+ struct n_tty_data *ldata = tty->disc_data;
+ char flag = TTY_NORMAL;
+
+ while (count--) {
+ if (fp)
+ flag = *fp++;
+ if (likely(flag == TTY_NORMAL)) {
+ unsigned char c = *cp++;
+
+ if (I_ISTRIP(tty))
+ c &= 0x7f;
+ if (I_IUCLC(tty) && L_IEXTEN(tty))
+ c = tolower(c);
+ if (L_EXTPROC(tty)) {
+ put_tty_queue(c, ldata);
+ continue;
}
+ if (!test_bit(c, ldata->char_map))
+ n_tty_receive_char_inline(tty, c);
+ else if (n_tty_receive_char_special(tty, c) && count) {
+ if (fp)
+ flag = *fp++;
+ n_tty_receive_char_lnext(tty, *cp++, flag);
+ count--;
+ }
+ } else
+ n_tty_receive_char_flagged(tty, *cp++, flag);
+ }
+}
+
+static void
+n_tty_receive_buf_fast(struct tty_struct *tty, const unsigned char *cp,
+ char *fp, int count)
+{
+ struct n_tty_data *ldata = tty->disc_data;
+ char flag = TTY_NORMAL;
+
+ while (count--) {
+ if (fp)
+ flag = *fp++;
+ if (likely(flag == TTY_NORMAL)) {
+ unsigned char c = *cp++;
+
+ if (!test_bit(c, ldata->char_map))
+ n_tty_receive_char_fast(tty, c);
+ else if (n_tty_receive_char_special(tty, c) && count) {
+ if (fp)
+ flag = *fp++;
+ n_tty_receive_char_lnext(tty, *cp++, flag);
+ count--;
+ }
+ } else
+ n_tty_receive_char_flagged(tty, *cp++, flag);
+ }
+}
+
+static void __receive_buf(struct tty_struct *tty, const unsigned char *cp,
+ char *fp, int count)
+{
+ struct n_tty_data *ldata = tty->disc_data;
+ bool preops = I_ISTRIP(tty) || (I_IUCLC(tty) && L_IEXTEN(tty));
+
+ if (ldata->real_raw)
+ n_tty_receive_buf_real_raw(tty, cp, fp, count);
+ else if (ldata->raw || (L_EXTPROC(tty) && !preops))
+ n_tty_receive_buf_raw(tty, cp, fp, count);
+ else if (tty->closing && !L_EXTPROC(tty))
+ n_tty_receive_buf_closing(tty, cp, fp, count);
+ else {
+ if (ldata->lnext) {
+ char flag = TTY_NORMAL;
+
+ if (fp)
+ flag = *fp++;
+ n_tty_receive_char_lnext(tty, *cp++, flag);
+ count--;
}
+
+ if (!preops && !I_PARMRK(tty))
+ n_tty_receive_buf_fast(tty, cp, fp, count);
+ else
+ n_tty_receive_buf_standard(tty, cp, fp, count);
+
+ flush_echoes(tty);
if (tty->ops->flush_chars)
tty->ops->flush_chars(tty);
}
- set_room(tty);
-
- if ((!ldata->icanon && (ldata->read_cnt >= ldata->minimum_to_wake)) ||
+ if ((!ldata->icanon && (read_cnt(ldata) >= ldata->minimum_to_wake)) ||
L_EXTPROC(tty)) {
kill_fasync(&tty->fasync, SIGIO, POLL_IN);
if (waitqueue_active(&tty->read_wait))
wake_up_interruptible(&tty->read_wait);
}
+}
+
+static void n_tty_receive_buf(struct tty_struct *tty, const unsigned char *cp,
+ char *fp, int count)
+{
+ int room, n;
+
+ down_read(&tty->termios_rwsem);
- /*
- * Check the remaining room for the input canonicalization
- * mode. We don't want to throttle the driver if we're in
- * canonical mode and don't have a newline yet!
- */
while (1) {
- tty_set_flow_change(tty, TTY_THROTTLE_SAFE);
- if (tty->receive_room >= TTY_THRESHOLD_THROTTLE)
+ room = receive_room(tty);
+ n = min(count, room);
+ if (!n)
break;
- if (!tty_throttle_safe(tty))
+ __receive_buf(tty, cp, fp, n);
+ cp += n;
+ if (fp)
+ fp += n;
+ count -= n;
+ }
+
+ tty->receive_room = room;
+ n_tty_check_throttle(tty);
+ up_read(&tty->termios_rwsem);
+}
+
+static int n_tty_receive_buf2(struct tty_struct *tty, const unsigned char *cp,
+ char *fp, int count)
+{
+ struct n_tty_data *ldata = tty->disc_data;
+ int room, n, rcvd = 0;
+
+ down_read(&tty->termios_rwsem);
+
+ while (1) {
+ room = receive_room(tty);
+ n = min(count, room);
+ if (!n) {
+ if (!room)
+ ldata->no_room = 1;
break;
+ }
+ __receive_buf(tty, cp, fp, n);
+ cp += n;
+ if (fp)
+ fp += n;
+ count -= n;
+ rcvd += n;
}
- __tty_set_flow_change(tty, 0);
+
+ tty->receive_room = room;
+ n_tty_check_throttle(tty);
+ up_read(&tty->termios_rwsem);
+
+ return rcvd;
}
int is_ignored(int sig)
@@ -1505,7 +1746,7 @@ int is_ignored(int sig)
* guaranteed that this function will not be re-entered or in progress
* when the ldisc is closed.
*
- * Locking: Caller holds tty->termios_mutex
+ * Locking: Caller holds tty->termios_rwsem
*/
static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
@@ -1517,12 +1758,13 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
canon_change = (old->c_lflag ^ tty->termios.c_lflag) & ICANON;
if (canon_change) {
bitmap_zero(ldata->read_flags, N_TTY_BUF_SIZE);
+ ldata->line_start = 0;
ldata->canon_head = ldata->read_tail;
- ldata->canon_data = 0;
ldata->erasing = 0;
+ ldata->lnext = 0;
}
- if (canon_change && !L_ICANON(tty) && ldata->read_cnt)
+ if (canon_change && !L_ICANON(tty) && read_cnt(ldata))
wake_up_interruptible(&tty->read_wait);
ldata->icanon = (L_ICANON(tty) != 0);
@@ -1531,41 +1773,38 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
I_ICRNL(tty) || I_INLCR(tty) || L_ICANON(tty) ||
I_IXON(tty) || L_ISIG(tty) || L_ECHO(tty) ||
I_PARMRK(tty)) {
- bitmap_zero(ldata->process_char_map, 256);
+ bitmap_zero(ldata->char_map, 256);
if (I_IGNCR(tty) || I_ICRNL(tty))
- set_bit('\r', ldata->process_char_map);
+ set_bit('\r', ldata->char_map);
if (I_INLCR(tty))
- set_bit('\n', ldata->process_char_map);
+ set_bit('\n', ldata->char_map);
if (L_ICANON(tty)) {
- set_bit(ERASE_CHAR(tty), ldata->process_char_map);
- set_bit(KILL_CHAR(tty), ldata->process_char_map);
- set_bit(EOF_CHAR(tty), ldata->process_char_map);
- set_bit('\n', ldata->process_char_map);
- set_bit(EOL_CHAR(tty), ldata->process_char_map);
+ set_bit(ERASE_CHAR(tty), ldata->char_map);
+ set_bit(KILL_CHAR(tty), ldata->char_map);
+ set_bit(EOF_CHAR(tty), ldata->char_map);
+ set_bit('\n', ldata->char_map);
+ set_bit(EOL_CHAR(tty), ldata->char_map);
if (L_IEXTEN(tty)) {
- set_bit(WERASE_CHAR(tty),
- ldata->process_char_map);
- set_bit(LNEXT_CHAR(tty),
- ldata->process_char_map);
- set_bit(EOL2_CHAR(tty),
- ldata->process_char_map);
+ set_bit(WERASE_CHAR(tty), ldata->char_map);
+ set_bit(LNEXT_CHAR(tty), ldata->char_map);
+ set_bit(EOL2_CHAR(tty), ldata->char_map);
if (L_ECHO(tty))
set_bit(REPRINT_CHAR(tty),
- ldata->process_char_map);
+ ldata->char_map);
}
}
if (I_IXON(tty)) {
- set_bit(START_CHAR(tty), ldata->process_char_map);
- set_bit(STOP_CHAR(tty), ldata->process_char_map);
+ set_bit(START_CHAR(tty), ldata->char_map);
+ set_bit(STOP_CHAR(tty), ldata->char_map);
}
if (L_ISIG(tty)) {
- set_bit(INTR_CHAR(tty), ldata->process_char_map);
- set_bit(QUIT_CHAR(tty), ldata->process_char_map);
- set_bit(SUSP_CHAR(tty), ldata->process_char_map);
+ set_bit(INTR_CHAR(tty), ldata->char_map);
+ set_bit(QUIT_CHAR(tty), ldata->char_map);
+ set_bit(SUSP_CHAR(tty), ldata->char_map);
}
- clear_bit(__DISABLED_CHAR, ldata->process_char_map);
+ clear_bit(__DISABLED_CHAR, ldata->char_map);
ldata->raw = 0;
ldata->real_raw = 0;
} else {
@@ -1608,9 +1847,7 @@ static void n_tty_close(struct tty_struct *tty)
if (tty->link)
n_tty_packet_mode_flush(tty);
- kfree(ldata->read_buf);
- kfree(ldata->echo_buf);
- kfree(ldata);
+ vfree(ldata);
tty->disc_data = NULL;
}
@@ -1628,26 +1865,23 @@ static int n_tty_open(struct tty_struct *tty)
{
struct n_tty_data *ldata;
- ldata = kzalloc(sizeof(*ldata), GFP_KERNEL);
+ /* Currently a malloc failure here can panic */
+ ldata = vmalloc(sizeof(*ldata));
if (!ldata)
goto err;
ldata->overrun_time = jiffies;
mutex_init(&ldata->atomic_read_lock);
mutex_init(&ldata->output_lock);
- mutex_init(&ldata->echo_lock);
- raw_spin_lock_init(&ldata->read_lock);
-
- /* These are ugly. Currently a malloc failure here can panic */
- ldata->read_buf = kzalloc(N_TTY_BUF_SIZE, GFP_KERNEL);
- ldata->echo_buf = kzalloc(N_TTY_BUF_SIZE, GFP_KERNEL);
- if (!ldata->read_buf || !ldata->echo_buf)
- goto err_free_bufs;
tty->disc_data = ldata;
reset_buffer_flags(tty->disc_data);
ldata->column = 0;
+ ldata->canon_column = 0;
ldata->minimum_to_wake = 1;
+ ldata->num_overrun = 0;
+ ldata->no_room = 0;
+ ldata->lnext = 0;
tty->closing = 0;
/* indicate buffer work may resume */
clear_bit(TTY_LDISC_HALTED, &tty->flags);
@@ -1655,10 +1889,6 @@ static int n_tty_open(struct tty_struct *tty)
tty_unthrottle(tty);
return 0;
-err_free_bufs:
- kfree(ldata->read_buf);
- kfree(ldata->echo_buf);
- kfree(ldata);
err:
return -ENOMEM;
}
@@ -1667,11 +1897,10 @@ static inline int input_available_p(struct tty_struct *tty, int amt)
{
struct n_tty_data *ldata = tty->disc_data;
- tty_flush_to_ldisc(tty);
if (ldata->icanon && !L_EXTPROC(tty)) {
- if (ldata->canon_data)
+ if (ldata->canon_head != ldata->read_tail)
return 1;
- } else if (ldata->read_cnt >= (amt ? amt : 1))
+ } else if (read_cnt(ldata) >= (amt ? amt : 1))
return 1;
return 0;
@@ -1692,6 +1921,9 @@ static inline int input_available_p(struct tty_struct *tty, int amt)
*
* Called under the ldata->atomic_read_lock sem
*
+ * n_tty_read()/consumer path:
+ * caller holds non-exclusive termios_rwsem
+ * read_tail published
*/
static int copy_from_read_buf(struct tty_struct *tty,
@@ -1702,34 +1934,114 @@ static int copy_from_read_buf(struct tty_struct *tty,
struct n_tty_data *ldata = tty->disc_data;
int retval;
size_t n;
- unsigned long flags;
bool is_eof;
+ size_t tail = ldata->read_tail & (N_TTY_BUF_SIZE - 1);
retval = 0;
- raw_spin_lock_irqsave(&ldata->read_lock, flags);
- n = min(ldata->read_cnt, N_TTY_BUF_SIZE - ldata->read_tail);
+ n = min(read_cnt(ldata), N_TTY_BUF_SIZE - tail);
n = min(*nr, n);
- raw_spin_unlock_irqrestore(&ldata->read_lock, flags);
if (n) {
- retval = copy_to_user(*b, &ldata->read_buf[ldata->read_tail], n);
+ retval = copy_to_user(*b, read_buf_addr(ldata, tail), n);
n -= retval;
- is_eof = n == 1 &&
- ldata->read_buf[ldata->read_tail] == EOF_CHAR(tty);
- tty_audit_add_data(tty, &ldata->read_buf[ldata->read_tail], n,
+ is_eof = n == 1 && read_buf(ldata, tail) == EOF_CHAR(tty);
+ tty_audit_add_data(tty, read_buf_addr(ldata, tail), n,
ldata->icanon);
- raw_spin_lock_irqsave(&ldata->read_lock, flags);
- ldata->read_tail = (ldata->read_tail + n) & (N_TTY_BUF_SIZE-1);
- ldata->read_cnt -= n;
+ ldata->read_tail += n;
/* Turn single EOF into zero-length read */
- if (L_EXTPROC(tty) && ldata->icanon && is_eof && !ldata->read_cnt)
+ if (L_EXTPROC(tty) && ldata->icanon && is_eof && !read_cnt(ldata))
n = 0;
- raw_spin_unlock_irqrestore(&ldata->read_lock, flags);
*b += n;
*nr -= n;
}
return retval;
}
+/**
+ * canon_copy_from_read_buf - copy read data in canonical mode
+ * @tty: terminal device
+ * @b: user data
+ * @nr: size of data
+ *
+ * Helper function for n_tty_read. It is only called when ICANON is on;
+ * it copies one line of input up to and including the line-delimiting
+ * character into the user-space buffer.
+ *
+ * Called under the atomic_read_lock mutex
+ *
+ * n_tty_read()/consumer path:
+ * caller holds non-exclusive termios_rwsem
+ * read_tail published
+ */
+
+static int canon_copy_from_read_buf(struct tty_struct *tty,
+ unsigned char __user **b,
+ size_t *nr)
+{
+ struct n_tty_data *ldata = tty->disc_data;
+ size_t n, size, more, c;
+ size_t eol;
+ size_t tail;
+ int ret, found = 0;
+ bool eof_push = 0;
+
+ /* N.B. avoid overrun if nr == 0 */
+ n = min(*nr, read_cnt(ldata));
+ if (!n)
+ return 0;
+
+ tail = ldata->read_tail & (N_TTY_BUF_SIZE - 1);
+ size = min_t(size_t, tail + n, N_TTY_BUF_SIZE);
+
+ n_tty_trace("%s: nr:%zu tail:%zu n:%zu size:%zu\n",
+ __func__, *nr, tail, n, size);
+
+ eol = find_next_bit(ldata->read_flags, size, tail);
+ more = n - (size - tail);
+ if (eol == N_TTY_BUF_SIZE && more) {
+ /* scan wrapped without finding set bit */
+ eol = find_next_bit(ldata->read_flags, more, 0);
+ if (eol != more)
+ found = 1;
+ } else if (eol != size)
+ found = 1;
+
+ size = N_TTY_BUF_SIZE - tail;
+ n = (found + eol + size) & (N_TTY_BUF_SIZE - 1);
+ c = n;
+
+ if (found && read_buf(ldata, eol) == __DISABLED_CHAR) {
+ n--;
+ eof_push = !n && ldata->read_tail != ldata->line_start;
+ }
+
+ n_tty_trace("%s: eol:%zu found:%d n:%zu c:%zu size:%zu more:%zu\n",
+ __func__, eol, found, n, c, size, more);
+
+ if (n > size) {
+ ret = copy_to_user(*b, read_buf_addr(ldata, tail), size);
+ if (ret)
+ return -EFAULT;
+ ret = copy_to_user(*b + size, ldata->read_buf, n - size);
+ } else
+ ret = copy_to_user(*b, read_buf_addr(ldata, tail), n);
+
+ if (ret)
+ return -EFAULT;
+ *b += n;
+ *nr -= n;
+
+ if (found)
+ clear_bit(eol, ldata->read_flags);
+ smp_mb__after_clear_bit();
+ ldata->read_tail += c;
+
+ if (found) {
+ ldata->line_start = ldata->read_tail;
+ tty_audit_push(tty);
+ }
+ return eof_push ? -EAGAIN : 0;
+}
+
extern ssize_t redirected_tty_write(struct file *, const char __user *,
size_t, loff_t *);
@@ -1787,6 +2099,10 @@ static int job_control(struct tty_struct *tty, struct file *file)
* a hangup. Always called in user context, may sleep.
*
* This code must be sure never to sleep through a hangup.
+ *
+ * n_tty_read()/consumer path:
+ * claims non-exclusive termios_rwsem
+ * publishes read_tail
*/
static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
@@ -1798,16 +2114,27 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
int c;
int minimum, time;
ssize_t retval = 0;
- ssize_t size;
long timeout;
unsigned long flags;
int packet;
-do_it_again:
c = job_control(tty, file);
if (c < 0)
return c;
+ /*
+ * Internal serialization of reads.
+ */
+ if (file->f_flags & O_NONBLOCK) {
+ if (!mutex_trylock(&ldata->atomic_read_lock))
+ return -EAGAIN;
+ } else {
+ if (mutex_lock_interruptible(&ldata->atomic_read_lock))
+ return -ERESTARTSYS;
+ }
+
+ down_read(&tty->termios_rwsem);
+
minimum = time = 0;
timeout = MAX_SCHEDULE_TIMEOUT;
if (!ldata->icanon) {
@@ -1825,16 +2152,6 @@ do_it_again:
}
}
- /*
- * Internal serialization of reads.
- */
- if (file->f_flags & O_NONBLOCK) {
- if (!mutex_trylock(&ldata->atomic_read_lock))
- return -EAGAIN;
- } else {
- if (mutex_lock_interruptible(&ldata->atomic_read_lock))
- return -ERESTARTSYS;
- }
packet = tty->packet;
add_wait_queue(&tty->read_wait, &wait);
@@ -1883,7 +2200,11 @@ do_it_again:
break;
}
n_tty_set_room(tty);
+ up_read(&tty->termios_rwsem);
+
timeout = schedule_timeout(timeout);
+
+ down_read(&tty->termios_rwsem);
continue;
}
__set_current_state(TASK_RUNNING);
@@ -1899,45 +2220,11 @@ do_it_again:
}
if (ldata->icanon && !L_EXTPROC(tty)) {
- /* N.B. avoid overrun if nr == 0 */
- raw_spin_lock_irqsave(&ldata->read_lock, flags);
- while (nr && ldata->read_cnt) {
- int eol;
-
- eol = test_and_clear_bit(ldata->read_tail,
- ldata->read_flags);
- c = ldata->read_buf[ldata->read_tail];
- ldata->read_tail = ((ldata->read_tail+1) &
- (N_TTY_BUF_SIZE-1));
- ldata->read_cnt--;
- if (eol) {
- /* this test should be redundant:
- * we shouldn't be reading data if
- * canon_data is 0
- */
- if (--ldata->canon_data < 0)
- ldata->canon_data = 0;
- }
- raw_spin_unlock_irqrestore(&ldata->read_lock, flags);
-
- if (!eol || (c != __DISABLED_CHAR)) {
- if (tty_put_user(tty, c, b++)) {
- retval = -EFAULT;
- b--;
- raw_spin_lock_irqsave(&ldata->read_lock, flags);
- break;
- }
- nr--;
- }
- if (eol) {
- tty_audit_push(tty);
- raw_spin_lock_irqsave(&ldata->read_lock, flags);
- break;
- }
- raw_spin_lock_irqsave(&ldata->read_lock, flags);
- }
- raw_spin_unlock_irqrestore(&ldata->read_lock, flags);
- if (retval)
+ retval = canon_copy_from_read_buf(tty, &b, &nr);
+ if (retval == -EAGAIN) {
+ retval = 0;
+ continue;
+ } else if (retval)
break;
} else {
int uncopied;
@@ -1951,24 +2238,7 @@ do_it_again:
}
}
- /* If there is enough space in the read buffer now, let the
- * low-level driver know. We use n_tty_chars_in_buffer() to
- * check the buffer, as it now knows about canonical mode.
- * Otherwise, if the driver is throttled and the line is
- * longer than TTY_THRESHOLD_UNTHROTTLE in canonical mode,
- * we won't get any more characters.
- */
- while (1) {
- tty_set_flow_change(tty, TTY_UNTHROTTLE_SAFE);
- if (n_tty_chars_in_buffer(tty) > TTY_THRESHOLD_UNTHROTTLE)
- break;
- if (!tty->count)
- break;
- n_tty_set_room(tty);
- if (!tty_unthrottle_safe(tty))
- break;
- }
- __tty_set_flow_change(tty, 0);
+ n_tty_check_unthrottle(tty);
if (b - buf >= minimum)
break;
@@ -1982,15 +2252,11 @@ do_it_again:
ldata->minimum_to_wake = minimum;
__set_current_state(TASK_RUNNING);
- size = b - buf;
- if (size) {
- retval = size;
- if (nr)
- clear_bit(TTY_PUSH, &tty->flags);
- } else if (test_and_clear_bit(TTY_PUSH, &tty->flags))
- goto do_it_again;
+ if (b - buf)
+ retval = b - buf;
n_tty_set_room(tty);
+ up_read(&tty->termios_rwsem);
return retval;
}
@@ -2031,6 +2297,8 @@ static ssize_t n_tty_write(struct tty_struct *tty, struct file *file,
return retval;
}
+ down_read(&tty->termios_rwsem);
+
/* Write out any echoed characters that are still pending */
process_echoes(tty);
@@ -2084,13 +2352,18 @@ static ssize_t n_tty_write(struct tty_struct *tty, struct file *file,
retval = -EAGAIN;
break;
}
+ up_read(&tty->termios_rwsem);
+
schedule();
+
+ down_read(&tty->termios_rwsem);
}
break_out:
__set_current_state(TASK_RUNNING);
remove_wait_queue(&tty->write_wait, &wait);
if (b - buf != nr && tty->fasync)
set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
+ up_read(&tty->termios_rwsem);
return (b - buf) ? b - buf : retval;
}
@@ -2139,19 +2412,19 @@ static unsigned int n_tty_poll(struct tty_struct *tty, struct file *file,
static unsigned long inq_canon(struct n_tty_data *ldata)
{
- int nr, head, tail;
+ size_t nr, head, tail;
- if (!ldata->canon_data)
+ if (ldata->canon_head == ldata->read_tail)
return 0;
head = ldata->canon_head;
tail = ldata->read_tail;
- nr = (head - tail) & (N_TTY_BUF_SIZE-1);
+ nr = head - tail;
/* Skip EOF-chars.. */
while (head != tail) {
- if (test_bit(tail, ldata->read_flags) &&
- ldata->read_buf[tail] == __DISABLED_CHAR)
+ if (test_bit(tail & (N_TTY_BUF_SIZE - 1), ldata->read_flags) &&
+ read_buf(ldata, tail) == __DISABLED_CHAR)
nr--;
- tail = (tail+1) & (N_TTY_BUF_SIZE-1);
+ tail++;
}
return nr;
}
@@ -2166,10 +2439,12 @@ static int n_tty_ioctl(struct tty_struct *tty, struct file *file,
case TIOCOUTQ:
return put_user(tty_chars_in_buffer(tty), (int __user *) arg);
case TIOCINQ:
- /* FIXME: Locking */
- retval = ldata->read_cnt;
+ down_write(&tty->termios_rwsem);
if (L_ICANON(tty))
retval = inq_canon(ldata);
+ else
+ retval = read_cnt(ldata);
+ up_write(&tty->termios_rwsem);
return put_user(retval, (unsigned int __user *) arg);
default:
return n_tty_ioctl_helper(tty, file, cmd, arg);
@@ -2203,6 +2478,7 @@ struct tty_ldisc_ops tty_ldisc_N_TTY = {
.receive_buf = n_tty_receive_buf,
.write_wakeup = n_tty_write_wakeup,
.fasync = n_tty_fasync,
+ .receive_buf2 = n_tty_receive_buf2,
};
/**
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index abfd990..25c9bc7 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -89,17 +89,13 @@ static void pty_unthrottle(struct tty_struct *tty)
* pty_space - report space left for writing
* @to: tty we are writing into
*
- * The tty buffers allow 64K but we sneak a peak and clip at 8K this
- * allows a lot of overspill room for echo and other fun messes to
- * be handled properly
+ * Limit the buffer space used by ptys to 8k.
*/
static int pty_space(struct tty_struct *to)
{
- int n = 8192 - to->port->buf.memory_used;
- if (n < 0)
- return 0;
- return n;
+ int n = tty_buffer_space_avail(to->port);
+ return min(n, 8192);
}
/**
@@ -125,10 +121,8 @@ static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c)
/* Stuff the data into the input queue of the other end */
c = tty_insert_flip_string(to->port, buf, c);
/* And shovel */
- if (c) {
+ if (c)
tty_flip_buffer_push(to->port);
- tty_wakeup(tty);
- }
}
return c;
}
@@ -287,7 +281,7 @@ static int pty_resize(struct tty_struct *tty, struct winsize *ws)
struct tty_struct *pty = tty->link;
/* For a PTY we need to lock the tty side */
- mutex_lock(&tty->termios_mutex);
+ mutex_lock(&tty->winsize_mutex);
if (!memcmp(ws, &tty->winsize, sizeof(*ws)))
goto done;
@@ -314,7 +308,7 @@ static int pty_resize(struct tty_struct *tty, struct winsize *ws)
tty->winsize = *ws;
pty->winsize = *ws; /* Never used so will go away soon */
done:
- mutex_unlock(&tty->termios_mutex);
+ mutex_unlock(&tty->winsize_mutex);
return 0;
}
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 86c00b1..570df9d 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -3062,7 +3062,7 @@ void serial8250_resume_port(int line)
*/
static int serial8250_probe(struct platform_device *dev)
{
- struct plat_serial8250_port *p = dev->dev.platform_data;
+ struct plat_serial8250_port *p = dev_get_platdata(&dev->dev);
struct uart_8250_port uart;
int ret, i, irqflag = 0;
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 76a8daa..daf710f 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -57,11 +57,25 @@
struct dw8250_data {
int last_lcr;
+ int last_mcr;
int line;
struct clk *clk;
u8 usr_reg;
};
+static inline int dw8250_modify_msr(struct uart_port *p, int offset, int value)
+{
+ struct dw8250_data *d = p->private_data;
+
+ /* If reading MSR, report CTS asserted when auto-CTS/RTS enabled */
+ if (offset == UART_MSR && d->last_mcr & UART_MCR_AFE) {
+ value |= UART_MSR_CTS;
+ value &= ~UART_MSR_DCTS;
+ }
+
+ return value;
+}
+
static void dw8250_serial_out(struct uart_port *p, int offset, int value)
{
struct dw8250_data *d = p->private_data;
@@ -69,15 +83,17 @@ static void dw8250_serial_out(struct uart_port *p, int offset, int value)
if (offset == UART_LCR)
d->last_lcr = value;
- offset <<= p->regshift;
- writeb(value, p->membase + offset);
+ if (offset == UART_MCR)
+ d->last_mcr = value;
+
+ writeb(value, p->membase + (offset << p->regshift));
}
static unsigned int dw8250_serial_in(struct uart_port *p, int offset)
{
- offset <<= p->regshift;
+ unsigned int value = readb(p->membase + (offset << p->regshift));
- return readb(p->membase + offset);
+ return dw8250_modify_msr(p, offset, value);
}
/* Read Back (rb) version to ensure register access ording. */
@@ -94,15 +110,17 @@ static void dw8250_serial_out32(struct uart_port *p, int offset, int value)
if (offset == UART_LCR)
d->last_lcr = value;
- offset <<= p->regshift;
- writel(value, p->membase + offset);
+ if (offset == UART_MCR)
+ d->last_mcr = value;
+
+ writel(value, p->membase + (offset << p->regshift));
}
static unsigned int dw8250_serial_in32(struct uart_port *p, int offset)
{
- offset <<= p->regshift;
+ unsigned int value = readl(p->membase + (offset << p->regshift));
- return readl(p->membase + offset);
+ return dw8250_modify_msr(p, offset, value);
}
static int dw8250_handle_irq(struct uart_port *p)
diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c
index 946ddd2..c100d63 100644
--- a/drivers/tty/serial/8250/8250_early.c
+++ b/drivers/tty/serial/8250/8250_early.c
@@ -194,7 +194,7 @@ static int __init parse_options(struct early_serial8250_device *device,
options++;
device->baud = simple_strtoul(options, NULL, 0);
length = min(strcspn(options, " ") + 1,
- sizeof(device->options));
+ (size_t)(sizeof(device->options)));
strlcpy(device->options, options, length);
} else {
device->baud = probe_baud(port);
diff --git a/drivers/tty/serial/8250/8250_em.c b/drivers/tty/serial/8250/8250_em.c
index 916cc19..5f3bba1 100644
--- a/drivers/tty/serial/8250/8250_em.c
+++ b/drivers/tty/serial/8250/8250_em.c
@@ -95,25 +95,23 @@ static int serial8250_em_probe(struct platform_device *pdev)
struct resource *irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
struct serial8250_em_priv *priv;
struct uart_8250_port up;
- int ret = -EINVAL;
+ int ret;
if (!regs || !irq) {
dev_err(&pdev->dev, "missing registers or irq\n");
- goto err0;
+ return -EINVAL;
}
- priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv) {
dev_err(&pdev->dev, "unable to allocate private data\n");
- ret = -ENOMEM;
- goto err0;
+ return -ENOMEM;
}
- priv->sclk = clk_get(&pdev->dev, "sclk");
+ priv->sclk = devm_clk_get(&pdev->dev, "sclk");
if (IS_ERR(priv->sclk)) {
dev_err(&pdev->dev, "unable to get clock\n");
- ret = PTR_ERR(priv->sclk);
- goto err1;
+ return PTR_ERR(priv->sclk);
}
memset(&up, 0, sizeof(up));
@@ -136,20 +134,13 @@ static int serial8250_em_probe(struct platform_device *pdev)
ret = serial8250_register_8250_port(&up);
if (ret < 0) {
dev_err(&pdev->dev, "unable to register 8250 port\n");
- goto err2;
+ clk_disable(priv->sclk);
+ return ret;
}
priv->line = ret;
platform_set_drvdata(pdev, priv);
return 0;
-
- err2:
- clk_disable(priv->sclk);
- clk_put(priv->sclk);
- err1:
- kfree(priv);
- err0:
- return ret;
}
static int serial8250_em_remove(struct platform_device *pdev)
@@ -158,8 +149,6 @@ static int serial8250_em_remove(struct platform_device *pdev)
serial8250_unregister_port(priv->line);
clk_disable(priv->sclk);
- clk_put(priv->sclk);
- kfree(priv);
return 0;
}
diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index c52948b..c810da7 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -1565,6 +1565,7 @@ pci_wch_ch353_setup(struct serial_private *priv,
#define PCI_DEVICE_ID_COMMTECH_4228PCIE 0x0021
#define PCI_DEVICE_ID_COMMTECH_4222PCIE 0x0022
#define PCI_DEVICE_ID_BROADCOM_TRUMANAGE 0x160a
+#define PCI_DEVICE_ID_AMCC_ADDIDATA_APCI7800 0x818e
#define PCI_VENDOR_ID_SUNIX 0x1fd4
#define PCI_DEVICE_ID_SUNIX_1999 0x1999
@@ -1587,8 +1588,8 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
* ADDI-DATA GmbH communication cards <info@addi-data.com>
*/
{
- .vendor = PCI_VENDOR_ID_ADDIDATA_OLD,
- .device = PCI_DEVICE_ID_ADDIDATA_APCI7800,
+ .vendor = PCI_VENDOR_ID_AMCC,
+ .device = PCI_DEVICE_ID_AMCC_ADDIDATA_APCI7800,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.setup = addidata_apci7800_setup,
@@ -4697,8 +4698,8 @@ static struct pci_device_id serial_pci_tbl[] = {
0,
pbn_b0_1_115200 },
- { PCI_VENDOR_ID_ADDIDATA_OLD,
- PCI_DEVICE_ID_ADDIDATA_APCI7800,
+ { PCI_VENDOR_ID_AMCC,
+ PCI_DEVICE_ID_AMCC_ADDIDATA_APCI7800,
PCI_ANY_ID,
PCI_ANY_ID,
0,
@@ -4797,6 +4798,12 @@ static struct pci_device_id serial_pci_tbl[] = {
PCI_VENDOR_ID_IBM, 0x0299,
0, 0, pbn_b0_bt_2_115200 },
+ /*
+ * other NetMos 9835 devices are most likely handled by the
+ * parport_serial driver, check drivers/parport/parport_serial.c
+ * before adding them here.
+ */
+
{ PCI_VENDOR_ID_NETMOS, PCI_DEVICE_ID_NETMOS_9901,
0xA000, 0x1000,
0, 0, pbn_b0_1_115200 },
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index a1ba94d..f3b306e 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -116,6 +116,8 @@ config SERIAL_8250_PCI
This builds standard PCI serial support. You may be able to
disable this feature if you only need legacy serial support.
Saves about 9K.
+ Note that serial ports on NetMos 9835 Multi-I/O cards are handled
+ by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL.
config SERIAL_8250_HP300
tristate
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 1456673..cc4c868 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -291,13 +291,13 @@ config SERIAL_MAX3100
config SERIAL_MAX310X
bool "MAX310X support"
- depends on SPI
+ depends on SPI_MASTER
select SERIAL_CORE
- select REGMAP_SPI if SPI
+ select REGMAP_SPI if SPI_MASTER
default n
help
This selects support for an advanced UART from Maxim (Dallas).
- Supported ICs are MAX3107, MAX3108.
+ Supported ICs are MAX3107, MAX3108, MAX3109, MAX14830.
Each IC contains 128 words each of receive and transmit FIFO
that can be controlled through I2C or high-speed SPI.
@@ -1401,13 +1401,16 @@ config SERIAL_XILINX_PS_UART_CONSOLE
Enable a Xilinx PS UART port to be the system console.
config SERIAL_AR933X
- bool "AR933X serial port support"
- depends on SOC_AR933X
+ tristate "AR933X serial port support"
+ depends on HAVE_CLK && SOC_AR933X
select SERIAL_CORE
help
If you have an Atheros AR933X SOC based board and want to use the
built-in UART of the SoC, say Y to this option.
+ To compile this driver as a module, choose M here: the
+ module will be called ar933x_uart.
+
config SERIAL_AR933X_CONSOLE
bool "Console on AR933X serial port"
depends on SERIAL_AR933X=y
@@ -1424,8 +1427,8 @@ config SERIAL_AR933X_NR_UARTS
to support.
config SERIAL_EFM32_UART
- tristate "EFM32 UART/USART port."
- depends on ARCH_EFM32
+ tristate "EFM32 UART/USART port"
+ depends on ARM && (ARCH_EFM32 || COMPILE_TEST)
select SERIAL_CORE
help
This driver support the USART and UART ports on
@@ -1497,6 +1500,22 @@ config SERIAL_FSL_LPUART_CONSOLE
If you have enabled the lpuart serial port on the Freescale SoCs,
you can make it the console by answering Y to this option.
+config SERIAL_ST_ASC
+ tristate "ST ASC serial port support"
+ select SERIAL_CORE
+ help
+ This driver is for the on-chip Asychronous Serial Controller on
+ STMicroelectronics STi SoCs.
+ ASC is embedded in ST COMMS IP block. It supports Rx & Tx functionality.
+ It support all industry standard baud rates.
+
+ If unsure, say N.
+
+config SERIAL_ST_ASC_CONSOLE
+ bool "Support for console on ST ASC"
+ depends on SERIAL_ST_ASC=y
+ select SERIAL_CORE_CONSOLE
+
endmenu
endif # TTY
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index cf650f0..47b679c 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -65,6 +65,7 @@ obj-$(CONFIG_SERIAL_KGDB_NMI) += kgdb_nmi.o
obj-$(CONFIG_SERIAL_KS8695) += serial_ks8695.o
obj-$(CONFIG_SERIAL_OMAP) += omap-serial.o
obj-$(CONFIG_SERIAL_ALTERA_UART) += altera_uart.o
+obj-$(CONFIG_SERIAL_ST_ASC) += st-asc.o
obj-$(CONFIG_KGDB_SERIAL_CONSOLE) += kgdboc.o
obj-$(CONFIG_SERIAL_QE) += ucc_uart.o
obj-$(CONFIG_SERIAL_TIMBERDALE) += timbuart.o
diff --git a/drivers/tty/serial/altera_jtaguart.c b/drivers/tty/serial/altera_jtaguart.c
index c6bdb94..18e038f 100644
--- a/drivers/tty/serial/altera_jtaguart.c
+++ b/drivers/tty/serial/altera_jtaguart.c
@@ -139,7 +139,9 @@ static void altera_jtaguart_rx_chars(struct altera_jtaguart *pp)
uart_insert_char(port, 0, 0, ch, flag);
}
+ spin_unlock(&port->lock);
tty_flip_buffer_push(&port->state->port);
+ spin_lock(&port->lock);
}
static void altera_jtaguart_tx_chars(struct altera_jtaguart *pp)
@@ -408,7 +410,8 @@ static struct uart_driver altera_jtaguart_driver = {
static int altera_jtaguart_probe(struct platform_device *pdev)
{
- struct altera_jtaguart_platform_uart *platp = pdev->dev.platform_data;
+ struct altera_jtaguart_platform_uart *platp =
+ dev_get_platdata(&pdev->dev);
struct uart_port *port;
struct resource *res_irq, *res_mem;
int i = pdev->id;
diff --git a/drivers/tty/serial/altera_uart.c b/drivers/tty/serial/altera_uart.c
index 1d46966..6431472 100644
--- a/drivers/tty/serial/altera_uart.c
+++ b/drivers/tty/serial/altera_uart.c
@@ -231,7 +231,9 @@ static void altera_uart_rx_chars(struct altera_uart *pp)
flag);
}
+ spin_unlock(&port->lock);
tty_flip_buffer_push(&port->state->port);
+ spin_lock(&port->lock);
}
static void altera_uart_tx_chars(struct altera_uart *pp)
@@ -534,7 +536,7 @@ static int altera_uart_get_of_uartclk(struct platform_device *pdev,
static int altera_uart_probe(struct platform_device *pdev)
{
- struct altera_uart_platform_uart *platp = pdev->dev.platform_data;
+ struct altera_uart_platform_uart *platp = dev_get_platdata(&pdev->dev);
struct uart_port *port;
struct resource *res_mem;
struct resource *res_irq;
diff --git a/drivers/tty/serial/amba-pl010.c b/drivers/tty/serial/amba-pl010.c
index c368405..8b90f0b 100644
--- a/drivers/tty/serial/amba-pl010.c
+++ b/drivers/tty/serial/amba-pl010.c
@@ -721,7 +721,7 @@ static int pl010_probe(struct amba_device *dev, const struct amba_id *id)
uap->port.flags = UPF_BOOT_AUTOCONF;
uap->port.line = i;
uap->dev = dev;
- uap->data = dev->dev.platform_data;
+ uap->data = dev_get_platdata(&dev->dev);
amba_ports[i] = uap;
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 28b35ad..aaa2286 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -265,7 +265,7 @@ static void pl011_sgbuf_free(struct dma_chan *chan, struct pl011_sgbuf *sg,
static void pl011_dma_probe_initcall(struct device *dev, struct uart_amba_port *uap)
{
/* DMA is the sole user of the platform data right now */
- struct amba_pl011_data *plat = uap->port.dev->platform_data;
+ struct amba_pl011_data *plat = dev_get_platdata(uap->port.dev);
struct dma_slave_config tx_conf = {
.dst_addr = uap->port.mapbase + UART01x_DR,
.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
@@ -677,6 +677,8 @@ static inline bool pl011_dma_tx_start(struct uart_amba_port *uap)
* Locking: called with port lock held and IRQs disabled.
*/
static void pl011_dma_flush_buffer(struct uart_port *port)
+__releases(&uap->port.lock)
+__acquires(&uap->port.lock)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
@@ -1198,6 +1200,8 @@ static void pl011_enable_ms(struct uart_port *port)
}
static void pl011_rx_chars(struct uart_amba_port *uap)
+__releases(&uap->port.lock)
+__acquires(&uap->port.lock)
{
pl011_fifo_to_tty(uap);
@@ -1497,10 +1501,10 @@ static int pl011_hwinit(struct uart_port *port)
uap->im = readw(uap->port.membase + UART011_IMSC);
writew(UART011_RTIM | UART011_RXIM, uap->port.membase + UART011_IMSC);
- if (uap->port.dev->platform_data) {
+ if (dev_get_platdata(uap->port.dev)) {
struct amba_pl011_data *plat;
- plat = uap->port.dev->platform_data;
+ plat = dev_get_platdata(uap->port.dev);
if (plat->init)
plat->init();
}
@@ -1645,10 +1649,10 @@ static void pl011_shutdown(struct uart_port *port)
/* Optionally let pins go into sleep states */
pinctrl_pm_select_sleep_state(port->dev);
- if (uap->port.dev->platform_data) {
+ if (dev_get_platdata(uap->port.dev)) {
struct amba_pl011_data *plat;
- plat = uap->port.dev->platform_data;
+ plat = dev_get_platdata(uap->port.dev);
if (plat->exit)
plat->exit();
}
@@ -2002,10 +2006,10 @@ static int __init pl011_console_setup(struct console *co, char *options)
if (ret)
return ret;
- if (uap->port.dev->platform_data) {
+ if (dev_get_platdata(uap->port.dev)) {
struct amba_pl011_data *plat;
- plat = uap->port.dev->platform_data;
+ plat = dev_get_platdata(uap->port.dev);
if (plat->init)
plat->init();
}
diff --git a/drivers/tty/serial/apbuart.c b/drivers/tty/serial/apbuart.c
index 6331464..de11ab8 100644
--- a/drivers/tty/serial/apbuart.c
+++ b/drivers/tty/serial/apbuart.c
@@ -125,7 +125,9 @@ static void apbuart_rx_chars(struct uart_port *port)
status = UART_GET_STATUS(port);
}
+ spin_unlock(&port->lock);
tty_flip_buffer_push(&port->state->port);
+ spin_lock(&port->lock);
}
static void apbuart_tx_chars(struct uart_port *port)
diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
index 27f20c5..acd03af 100644
--- a/drivers/tty/serial/ar933x_uart.c
+++ b/drivers/tty/serial/ar933x_uart.c
@@ -17,6 +17,8 @@
#include <linux/sysrq.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
@@ -24,11 +26,11 @@
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/irq.h>
+#include <linux/clk.h>
#include <asm/div64.h>
#include <asm/mach-ath79/ar933x_uart.h>
-#include <asm/mach-ath79/ar933x_uart_platform.h>
#define DRIVER_NAME "ar933x-uart"
@@ -47,8 +49,14 @@ struct ar933x_uart_port {
unsigned int ier; /* shadow Interrupt Enable Register */
unsigned int min_baud;
unsigned int max_baud;
+ struct clk *clk;
};
+static inline bool ar933x_uart_console_enabled(void)
+{
+ return config_enabled(CONFIG_SERIAL_AR933X_CONSOLE);
+}
+
static inline unsigned int ar933x_uart_read(struct ar933x_uart_port *up,
int offset)
{
@@ -322,7 +330,9 @@ static void ar933x_uart_rx_chars(struct ar933x_uart_port *up)
tty_insert_flip_char(port, ch, TTY_NORMAL);
} while (max_count-- > 0);
+ spin_unlock(&up->port.lock);
tty_flip_buffer_push(port);
+ spin_lock(&up->port.lock);
}
static void ar933x_uart_tx_chars(struct ar933x_uart_port *up)
@@ -497,8 +507,6 @@ static struct uart_ops ar933x_uart_ops = {
.verify_port = ar933x_uart_verify_port,
};
-#ifdef CONFIG_SERIAL_AR933X_CONSOLE
-
static struct ar933x_uart_port *
ar933x_console_ports[CONFIG_SERIAL_AR933X_NR_UARTS];
@@ -597,80 +605,88 @@ static struct console ar933x_uart_console = {
static void ar933x_uart_add_console_port(struct ar933x_uart_port *up)
{
+ if (!ar933x_uart_console_enabled())
+ return;
+
ar933x_console_ports[up->port.line] = up;
}
-#define AR933X_SERIAL_CONSOLE (&ar933x_uart_console)
-
-#else
-
-static inline void ar933x_uart_add_console_port(struct ar933x_uart_port *up) {}
-
-#define AR933X_SERIAL_CONSOLE NULL
-
-#endif /* CONFIG_SERIAL_AR933X_CONSOLE */
-
static struct uart_driver ar933x_uart_driver = {
.owner = THIS_MODULE,
.driver_name = DRIVER_NAME,
.dev_name = "ttyATH",
.nr = CONFIG_SERIAL_AR933X_NR_UARTS,
- .cons = AR933X_SERIAL_CONSOLE,
+ .cons = NULL, /* filled in runtime */
};
static int ar933x_uart_probe(struct platform_device *pdev)
{
- struct ar933x_uart_platform_data *pdata;
struct ar933x_uart_port *up;
struct uart_port *port;
struct resource *mem_res;
struct resource *irq_res;
+ struct device_node *np;
unsigned int baud;
int id;
int ret;
- pdata = pdev->dev.platform_data;
- if (!pdata)
- return -EINVAL;
-
- id = pdev->id;
- if (id == -1)
- id = 0;
+ np = pdev->dev.of_node;
+ if (config_enabled(CONFIG_OF) && np) {
+ id = of_alias_get_id(np, "serial");
+ if (id < 0) {
+ dev_err(&pdev->dev, "unable to get alias id, err=%d\n",
+ id);
+ return id;
+ }
+ } else {
+ id = pdev->id;
+ if (id == -1)
+ id = 0;
+ }
if (id > CONFIG_SERIAL_AR933X_NR_UARTS)
return -EINVAL;
- mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!mem_res) {
- dev_err(&pdev->dev, "no MEM resource\n");
- return -EINVAL;
- }
-
irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!irq_res) {
dev_err(&pdev->dev, "no IRQ resource\n");
return -EINVAL;
}
- up = kzalloc(sizeof(struct ar933x_uart_port), GFP_KERNEL);
+ up = devm_kzalloc(&pdev->dev, sizeof(struct ar933x_uart_port),
+ GFP_KERNEL);
if (!up)
return -ENOMEM;
+ up->clk = devm_clk_get(&pdev->dev, "uart");
+ if (IS_ERR(up->clk)) {
+ dev_err(&pdev->dev, "unable to get UART clock\n");
+ return PTR_ERR(up->clk);
+ }
+
port = &up->port;
- port->mapbase = mem_res->start;
- port->membase = ioremap(mem_res->start, AR933X_UART_REGS_SIZE);
- if (!port->membase) {
- ret = -ENOMEM;
- goto err_free_up;
+ mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ port->membase = devm_ioremap_resource(&pdev->dev, mem_res);
+ if (IS_ERR(port->membase))
+ return PTR_ERR(port->membase);
+
+ ret = clk_prepare_enable(up->clk);
+ if (ret)
+ return ret;
+
+ port->uartclk = clk_get_rate(up->clk);
+ if (!port->uartclk) {
+ ret = -EINVAL;
+ goto err_disable_clk;
}
+ port->mapbase = mem_res->start;
port->line = id;
port->irq = irq_res->start;
port->dev = &pdev->dev;
port->type = PORT_AR933X;
port->iotype = UPIO_MEM32;
- port->uartclk = pdata->uartclk;
port->regshift = 2;
port->fifosize = AR933X_UART_FIFO_SIZE;
@@ -686,15 +702,13 @@ static int ar933x_uart_probe(struct platform_device *pdev)
ret = uart_add_one_port(&ar933x_uart_driver, &up->port);
if (ret)
- goto err_unmap;
+ goto err_disable_clk;
platform_set_drvdata(pdev, up);
return 0;
-err_unmap:
- iounmap(up->port.membase);
-err_free_up:
- kfree(up);
+err_disable_clk:
+ clk_disable_unprepare(up->clk);
return ret;
}
@@ -703,23 +717,30 @@ static int ar933x_uart_remove(struct platform_device *pdev)
struct ar933x_uart_port *up;
up = platform_get_drvdata(pdev);
- platform_set_drvdata(pdev, NULL);
if (up) {
uart_remove_one_port(&ar933x_uart_driver, &up->port);
- iounmap(up->port.membase);
- kfree(up);
+ clk_disable_unprepare(up->clk);
}
return 0;
}
+#ifdef CONFIG_OF
+static const struct of_device_id ar933x_uart_of_ids[] = {
+ { .compatible = "qca,ar9330-uart" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ar933x_uart_of_ids);
+#endif
+
static struct platform_driver ar933x_uart_platform_driver = {
.probe = ar933x_uart_probe,
.remove = ar933x_uart_remove,
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(ar933x_uart_of_ids),
},
};
@@ -727,7 +748,9 @@ static int __init ar933x_uart_init(void)
{
int ret;
- ar933x_uart_driver.nr = CONFIG_SERIAL_AR933X_NR_UARTS;
+ if (ar933x_uart_console_enabled())
+ ar933x_uart_driver.cons = &ar933x_uart_console;
+
ret = uart_register_driver(&ar933x_uart_driver);
if (ret)
goto err_out;
diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c
index 22f280a..569872f 100644
--- a/drivers/tty/serial/arc_uart.c
+++ b/drivers/tty/serial/arc_uart.c
@@ -209,9 +209,9 @@ static void arc_serial_start_tx(struct uart_port *port)
arc_serial_tx_chars(uart);
}
-static void arc_serial_rx_chars(struct arc_uart_port *uart)
+static void arc_serial_rx_chars(struct arc_uart_port *uart, unsigned int status)
{
- unsigned int status, ch, flg = 0;
+ unsigned int ch, flg = 0;
/*
* UART has 4 deep RX-FIFO. Driver's recongnition of this fact
@@ -222,11 +222,11 @@ static void arc_serial_rx_chars(struct arc_uart_port *uart)
* before RX-EMPTY=0, implies some sort of buffering going on in the
* controller, which is indeed the Rx-FIFO.
*/
- while (!((status = UART_GET_STATUS(uart)) & RXEMPTY)) {
-
- ch = UART_GET_DATA(uart);
- uart->port.icount.rx++;
-
+ do {
+ /*
+ * This could be an Rx Intr for err (no data),
+ * so check err and clear that Intr first
+ */
if (unlikely(status & (RXOERR | RXFERR))) {
if (status & RXOERR) {
uart->port.icount.overrun++;
@@ -242,14 +242,19 @@ static void arc_serial_rx_chars(struct arc_uart_port *uart)
} else
flg = TTY_NORMAL;
- if (unlikely(uart_handle_sysrq_char(&uart->port, ch)))
- goto done;
+ if (status & RXEMPTY)
+ continue;
- uart_insert_char(&uart->port, status, RXOERR, ch, flg);
+ ch = UART_GET_DATA(uart);
+ uart->port.icount.rx++;
+
+ if (!(uart_handle_sysrq_char(&uart->port, ch)))
+ uart_insert_char(&uart->port, status, RXOERR, ch, flg);
-done:
+ spin_unlock(&uart->port.lock);
tty_flip_buffer_push(&uart->port.state->port);
- }
+ spin_lock(&uart->port.lock);
+ } while (!((status = UART_GET_STATUS(uart)) & RXEMPTY));
}
/*
@@ -292,11 +297,11 @@ static irqreturn_t arc_serial_isr(int irq, void *dev_id)
* notifications from the UART Controller.
* To demultiplex between the two, we check the relevant bits
*/
- if ((status & RXIENB) && !(status & RXEMPTY)) {
+ if (status & RXIENB) {
/* already in ISR, no need of xx_irqsave */
spin_lock(&uart->port.lock);
- arc_serial_rx_chars(uart);
+ arc_serial_rx_chars(uart, status);
spin_unlock(&uart->port.lock);
}
@@ -528,7 +533,7 @@ arc_uart_init_one(struct platform_device *pdev, int dev_id)
unsigned long *plat_data;
struct arc_uart_port *uart = &arc_uart_ports[dev_id];
- plat_data = ((unsigned long *)(pdev->dev.platform_data));
+ plat_data = (unsigned long *)dev_get_platdata(&pdev->dev);
if (!plat_data)
return -ENODEV;
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 691265f..d067285 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -39,8 +39,8 @@
#include <linux/atmel_pdc.h>
#include <linux/atmel_serial.h>
#include <linux/uaccess.h>
-#include <linux/pinctrl/consumer.h>
#include <linux/platform_data/atmel.h>
+#include <linux/timer.h>
#include <asm/io.h>
#include <asm/ioctls.h>
@@ -98,6 +98,7 @@ static void atmel_stop_rx(struct uart_port *port);
#define UART_PUT_BRGR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_BRGR)
#define UART_PUT_RTOR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_RTOR)
#define UART_PUT_TTGR(port, v) __raw_writel(v, (port)->membase + ATMEL_US_TTGR)
+#define UART_GET_IP_NAME(port) __raw_readl((port)->membase + ATMEL_US_NAME)
/* PDC registers */
#define UART_PUT_PTCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_PTCR)
@@ -140,13 +141,25 @@ struct atmel_uart_port {
u32 backup_imr; /* IMR saved during suspend */
int break_active; /* break being received */
- short use_dma_rx; /* enable PDC receiver */
+ bool use_dma_rx; /* enable DMA receiver */
+ bool use_pdc_rx; /* enable PDC receiver */
short pdc_rx_idx; /* current PDC RX buffer */
struct atmel_dma_buffer pdc_rx[2]; /* PDC receier */
- short use_dma_tx; /* enable PDC transmitter */
+ bool use_dma_tx; /* enable DMA transmitter */
+ bool use_pdc_tx; /* enable PDC transmitter */
struct atmel_dma_buffer pdc_tx; /* PDC transmitter */
+ spinlock_t lock_tx; /* port lock */
+ spinlock_t lock_rx; /* port lock */
+ struct dma_chan *chan_tx;
+ struct dma_chan *chan_rx;
+ struct dma_async_tx_descriptor *desc_tx;
+ struct dma_async_tx_descriptor *desc_rx;
+ dma_cookie_t cookie_tx;
+ dma_cookie_t cookie_rx;
+ struct scatterlist sg_tx;
+ struct scatterlist sg_rx;
struct tasklet_struct tasklet;
unsigned int irq_status;
unsigned int irq_status_prev;
@@ -155,6 +168,14 @@ struct atmel_uart_port {
struct serial_rs485 rs485; /* rs485 settings */
unsigned int tx_done_mask;
+ bool is_usart; /* usart or uart */
+ struct timer_list uart_timer; /* uart timer */
+ int (*prepare_rx)(struct uart_port *port);
+ int (*prepare_tx)(struct uart_port *port);
+ void (*schedule_rx)(struct uart_port *port);
+ void (*schedule_tx)(struct uart_port *port);
+ void (*release_rx)(struct uart_port *port);
+ void (*release_tx)(struct uart_port *port);
};
static struct atmel_uart_port atmel_ports[ATMEL_MAX_UART];
@@ -181,31 +202,45 @@ to_atmel_uart_port(struct uart_port *uart)
}
#ifdef CONFIG_SERIAL_ATMEL_PDC
-static bool atmel_use_dma_rx(struct uart_port *port)
+static bool atmel_use_pdc_rx(struct uart_port *port)
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
- return atmel_port->use_dma_rx;
+ return atmel_port->use_pdc_rx;
}
-static bool atmel_use_dma_tx(struct uart_port *port)
+static bool atmel_use_pdc_tx(struct uart_port *port)
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
- return atmel_port->use_dma_tx;
+ return atmel_port->use_pdc_tx;
}
#else
-static bool atmel_use_dma_rx(struct uart_port *port)
+static bool atmel_use_pdc_rx(struct uart_port *port)
{
return false;
}
-static bool atmel_use_dma_tx(struct uart_port *port)
+static bool atmel_use_pdc_tx(struct uart_port *port)
{
return false;
}
#endif
+static bool atmel_use_dma_tx(struct uart_port *port)
+{
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
+ return atmel_port->use_dma_tx;
+}
+
+static bool atmel_use_dma_rx(struct uart_port *port)
+{
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
+ return atmel_port->use_dma_rx;
+}
+
/* Enable or disable the rs485 support */
void atmel_config_rs485(struct uart_port *port, struct serial_rs485 *rs485conf)
{
@@ -233,7 +268,7 @@ void atmel_config_rs485(struct uart_port *port, struct serial_rs485 *rs485conf)
mode |= ATMEL_US_USMODE_RS485;
} else {
dev_dbg(port->dev, "Setting UART to RS232\n");
- if (atmel_use_dma_tx(port))
+ if (atmel_use_pdc_tx(port))
atmel_port->tx_done_mask = ATMEL_US_ENDTX |
ATMEL_US_TXBUFE;
else
@@ -345,7 +380,7 @@ static void atmel_stop_tx(struct uart_port *port)
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
- if (atmel_use_dma_tx(port)) {
+ if (atmel_use_pdc_tx(port)) {
/* disable PDC transmit */
UART_PUT_PTCR(port, ATMEL_PDC_TXTDIS);
}
@@ -364,7 +399,7 @@ static void atmel_start_tx(struct uart_port *port)
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
- if (atmel_use_dma_tx(port)) {
+ if (atmel_use_pdc_tx(port)) {
if (UART_GET_PTSR(port) & ATMEL_PDC_TXTEN)
/* The transmitter is already running. Yes, we
really need this.*/
@@ -390,7 +425,7 @@ static void atmel_start_rx(struct uart_port *port)
UART_PUT_CR(port, ATMEL_US_RXEN);
- if (atmel_use_dma_rx(port)) {
+ if (atmel_use_pdc_rx(port)) {
/* enable PDC controller */
UART_PUT_IER(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT |
port->read_status_mask);
@@ -407,7 +442,7 @@ static void atmel_stop_rx(struct uart_port *port)
{
UART_PUT_CR(port, ATMEL_US_RXDIS);
- if (atmel_use_dma_rx(port)) {
+ if (atmel_use_pdc_rx(port)) {
/* disable PDC receive */
UART_PUT_PTCR(port, ATMEL_PDC_RXTDIS);
UART_PUT_IDR(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT |
@@ -564,6 +599,372 @@ static void atmel_tx_chars(struct uart_port *port)
UART_PUT_IER(port, atmel_port->tx_done_mask);
}
+static void atmel_complete_tx_dma(void *arg)
+{
+ struct atmel_uart_port *atmel_port = arg;
+ struct uart_port *port = &atmel_port->uart;
+ struct circ_buf *xmit = &port->state->xmit;
+ struct dma_chan *chan = atmel_port->chan_tx;
+ unsigned long flags;
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ if (chan)
+ dmaengine_terminate_all(chan);
+ xmit->tail += sg_dma_len(&atmel_port->sg_tx);
+ xmit->tail &= UART_XMIT_SIZE - 1;
+
+ port->icount.tx += sg_dma_len(&atmel_port->sg_tx);
+
+ spin_lock_irq(&atmel_port->lock_tx);
+ async_tx_ack(atmel_port->desc_tx);
+ atmel_port->cookie_tx = -EINVAL;
+ atmel_port->desc_tx = NULL;
+ spin_unlock_irq(&atmel_port->lock_tx);
+
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(port);
+
+ /* Do we really need this? */
+ if (!uart_circ_empty(xmit))
+ tasklet_schedule(&atmel_port->tasklet);
+
+ spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void atmel_release_tx_dma(struct uart_port *port)
+{
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+ struct dma_chan *chan = atmel_port->chan_tx;
+
+ if (chan) {
+ dmaengine_terminate_all(chan);
+ dma_release_channel(chan);
+ dma_unmap_sg(port->dev, &atmel_port->sg_tx, 1,
+ DMA_MEM_TO_DEV);
+ }
+
+ atmel_port->desc_tx = NULL;
+ atmel_port->chan_tx = NULL;
+ atmel_port->cookie_tx = -EINVAL;
+}
+
+/*
+ * Called from tasklet with TXRDY interrupt is disabled.
+ */
+static void atmel_tx_dma(struct uart_port *port)
+{
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+ struct circ_buf *xmit = &port->state->xmit;
+ struct dma_chan *chan = atmel_port->chan_tx;
+ struct dma_async_tx_descriptor *desc;
+ struct scatterlist *sg = &atmel_port->sg_tx;
+
+ /* Make sure we have an idle channel */
+ if (atmel_port->desc_tx != NULL)
+ return;
+
+ if (!uart_circ_empty(xmit) && !uart_tx_stopped(port)) {
+ /*
+ * DMA is idle now.
+ * Port xmit buffer is already mapped,
+ * and it is one page... Just adjust
+ * offsets and lengths. Since it is a circular buffer,
+ * we have to transmit till the end, and then the rest.
+ * Take the port lock to get a
+ * consistent xmit buffer state.
+ */
+ sg->offset = xmit->tail & (UART_XMIT_SIZE - 1);
+ sg_dma_address(sg) = (sg_dma_address(sg) &
+ ~(UART_XMIT_SIZE - 1))
+ + sg->offset;
+ sg_dma_len(sg) = CIRC_CNT_TO_END(xmit->head,
+ xmit->tail,
+ UART_XMIT_SIZE);
+ BUG_ON(!sg_dma_len(sg));
+
+ desc = dmaengine_prep_slave_sg(chan,
+ sg,
+ 1,
+ DMA_MEM_TO_DEV,
+ DMA_PREP_INTERRUPT |
+ DMA_CTRL_ACK);
+ if (!desc) {
+ dev_err(port->dev, "Failed to send via dma!\n");
+ return;
+ }
+
+ dma_sync_sg_for_device(port->dev, sg, 1, DMA_MEM_TO_DEV);
+
+ atmel_port->desc_tx = desc;
+ desc->callback = atmel_complete_tx_dma;
+ desc->callback_param = atmel_port;
+ atmel_port->cookie_tx = dmaengine_submit(desc);
+
+ } else {
+ if (atmel_port->rs485.flags & SER_RS485_ENABLED) {
+ /* DMA done, stop TX, start RX for RS485 */
+ atmel_start_rx(port);
+ }
+ }
+
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(port);
+}
+
+static int atmel_prepare_tx_dma(struct uart_port *port)
+{
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+ dma_cap_mask_t mask;
+ struct dma_slave_config config;
+ int ret, nent;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+
+ atmel_port->chan_tx = dma_request_slave_channel(port->dev, "tx");
+ if (atmel_port->chan_tx == NULL)
+ goto chan_err;
+ dev_info(port->dev, "using %s for tx DMA transfers\n",
+ dma_chan_name(atmel_port->chan_tx));
+
+ spin_lock_init(&atmel_port->lock_tx);
+ sg_init_table(&atmel_port->sg_tx, 1);
+ /* UART circular tx buffer is an aligned page. */
+ BUG_ON((int)port->state->xmit.buf & ~PAGE_MASK);
+ sg_set_page(&atmel_port->sg_tx,
+ virt_to_page(port->state->xmit.buf),
+ UART_XMIT_SIZE,
+ (int)port->state->xmit.buf & ~PAGE_MASK);
+ nent = dma_map_sg(port->dev,
+ &atmel_port->sg_tx,
+ 1,
+ DMA_MEM_TO_DEV);
+
+ if (!nent) {
+ dev_dbg(port->dev, "need to release resource of dma\n");
+ goto chan_err;
+ } else {
+ dev_dbg(port->dev, "%s: mapped %d@%p to %x\n", __func__,
+ sg_dma_len(&atmel_port->sg_tx),
+ port->state->xmit.buf,
+ sg_dma_address(&atmel_port->sg_tx));
+ }
+
+ /* Configure the slave DMA */
+ memset(&config, 0, sizeof(config));
+ config.direction = DMA_MEM_TO_DEV;
+ config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+ config.dst_addr = port->mapbase + ATMEL_US_THR;
+
+ ret = dmaengine_device_control(atmel_port->chan_tx,
+ DMA_SLAVE_CONFIG,
+ (unsigned long)&config);
+ if (ret) {
+ dev_err(port->dev, "DMA tx slave configuration failed\n");
+ goto chan_err;
+ }
+
+ return 0;
+
+chan_err:
+ dev_err(port->dev, "TX channel not available, switch to pio\n");
+ atmel_port->use_dma_tx = 0;
+ if (atmel_port->chan_tx)
+ atmel_release_tx_dma(port);
+ return -EINVAL;
+}
+
+static void atmel_flip_buffer_rx_dma(struct uart_port *port,
+ char *buf, size_t count)
+{
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+ struct tty_port *tport = &port->state->port;
+
+ dma_sync_sg_for_cpu(port->dev,
+ &atmel_port->sg_rx,
+ 1,
+ DMA_DEV_TO_MEM);
+
+ tty_insert_flip_string(tport, buf, count);
+
+ dma_sync_sg_for_device(port->dev,
+ &atmel_port->sg_rx,
+ 1,
+ DMA_DEV_TO_MEM);
+ /*
+ * Drop the lock here since it might end up calling
+ * uart_start(), which takes the lock.
+ */
+ spin_unlock(&port->lock);
+ tty_flip_buffer_push(tport);
+ spin_lock(&port->lock);
+}
+
+static void atmel_complete_rx_dma(void *arg)
+{
+ struct uart_port *port = arg;
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
+ tasklet_schedule(&atmel_port->tasklet);
+}
+
+static void atmel_release_rx_dma(struct uart_port *port)
+{
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+ struct dma_chan *chan = atmel_port->chan_rx;
+
+ if (chan) {
+ dmaengine_terminate_all(chan);
+ dma_release_channel(chan);
+ dma_unmap_sg(port->dev, &atmel_port->sg_rx, 1,
+ DMA_DEV_TO_MEM);
+ }
+
+ atmel_port->desc_rx = NULL;
+ atmel_port->chan_rx = NULL;
+ atmel_port->cookie_rx = -EINVAL;
+
+ if (!atmel_port->is_usart)
+ del_timer_sync(&atmel_port->uart_timer);
+}
+
+static void atmel_rx_from_dma(struct uart_port *port)
+{
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+ struct circ_buf *ring = &atmel_port->rx_ring;
+ struct dma_chan *chan = atmel_port->chan_rx;
+ struct dma_tx_state state;
+ enum dma_status dmastat;
+ size_t pending, count;
+
+
+ /* Reset the UART timeout early so that we don't miss one */
+ UART_PUT_CR(port, ATMEL_US_STTTO);
+ dmastat = dmaengine_tx_status(chan,
+ atmel_port->cookie_rx,
+ &state);
+ /* Restart a new tasklet if DMA status is error */
+ if (dmastat == DMA_ERROR) {
+ dev_dbg(port->dev, "Get residue error, restart tasklet\n");
+ UART_PUT_IER(port, ATMEL_US_TIMEOUT);
+ tasklet_schedule(&atmel_port->tasklet);
+ return;
+ }
+ /* current transfer size should no larger than dma buffer */
+ pending = sg_dma_len(&atmel_port->sg_rx) - state.residue;
+ BUG_ON(pending > sg_dma_len(&atmel_port->sg_rx));
+
+ /*
+ * This will take the chars we have so far,
+ * ring->head will record the transfer size, only new bytes come
+ * will insert into the framework.
+ */
+ if (pending > ring->head) {
+ count = pending - ring->head;
+
+ atmel_flip_buffer_rx_dma(port, ring->buf + ring->head, count);
+
+ ring->head += count;
+ if (ring->head == sg_dma_len(&atmel_port->sg_rx))
+ ring->head = 0;
+
+ port->icount.rx += count;
+ }
+
+ UART_PUT_IER(port, ATMEL_US_TIMEOUT);
+}
+
+static int atmel_prepare_rx_dma(struct uart_port *port)
+{
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+ struct dma_async_tx_descriptor *desc;
+ dma_cap_mask_t mask;
+ struct dma_slave_config config;
+ struct circ_buf *ring;
+ int ret, nent;
+
+ ring = &atmel_port->rx_ring;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_CYCLIC, mask);
+
+ atmel_port->chan_rx = dma_request_slave_channel(port->dev, "rx");
+ if (atmel_port->chan_rx == NULL)
+ goto chan_err;
+ dev_info(port->dev, "using %s for rx DMA transfers\n",
+ dma_chan_name(atmel_port->chan_rx));
+
+ spin_lock_init(&atmel_port->lock_rx);
+ sg_init_table(&atmel_port->sg_rx, 1);
+ /* UART circular rx buffer is an aligned page. */
+ BUG_ON((int)port->state->xmit.buf & ~PAGE_MASK);
+ sg_set_page(&atmel_port->sg_rx,
+ virt_to_page(ring->buf),
+ ATMEL_SERIAL_RINGSIZE,
+ (int)ring->buf & ~PAGE_MASK);
+ nent = dma_map_sg(port->dev,
+ &atmel_port->sg_rx,
+ 1,
+ DMA_DEV_TO_MEM);
+
+ if (!nent) {
+ dev_dbg(port->dev, "need to release resource of dma\n");
+ goto chan_err;
+ } else {
+ dev_dbg(port->dev, "%s: mapped %d@%p to %x\n", __func__,
+ sg_dma_len(&atmel_port->sg_rx),
+ ring->buf,
+ sg_dma_address(&atmel_port->sg_rx));
+ }
+
+ /* Configure the slave DMA */
+ memset(&config, 0, sizeof(config));
+ config.direction = DMA_DEV_TO_MEM;
+ config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+ config.src_addr = port->mapbase + ATMEL_US_RHR;
+
+ ret = dmaengine_device_control(atmel_port->chan_rx,
+ DMA_SLAVE_CONFIG,
+ (unsigned long)&config);
+ if (ret) {
+ dev_err(port->dev, "DMA rx slave configuration failed\n");
+ goto chan_err;
+ }
+ /*
+ * Prepare a cyclic dma transfer, assign 2 descriptors,
+ * each one is half ring buffer size
+ */
+ desc = dmaengine_prep_dma_cyclic(atmel_port->chan_rx,
+ sg_dma_address(&atmel_port->sg_rx),
+ sg_dma_len(&atmel_port->sg_rx),
+ sg_dma_len(&atmel_port->sg_rx)/2,
+ DMA_DEV_TO_MEM,
+ DMA_PREP_INTERRUPT);
+ desc->callback = atmel_complete_rx_dma;
+ desc->callback_param = port;
+ atmel_port->desc_rx = desc;
+ atmel_port->cookie_rx = dmaengine_submit(desc);
+
+ return 0;
+
+chan_err:
+ dev_err(port->dev, "RX channel not available, switch to pio\n");
+ atmel_port->use_dma_rx = 0;
+ if (atmel_port->chan_rx)
+ atmel_release_rx_dma(port);
+ return -EINVAL;
+}
+
+static void atmel_uart_timer_callback(unsigned long data)
+{
+ struct uart_port *port = (void *)data;
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
+ tasklet_schedule(&atmel_port->tasklet);
+ mod_timer(&atmel_port->uart_timer, jiffies + uart_poll_timeout(port));
+}
+
/*
* receive interrupt handler.
*/
@@ -572,7 +973,7 @@ atmel_handle_receive(struct uart_port *port, unsigned int pending)
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
- if (atmel_use_dma_rx(port)) {
+ if (atmel_use_pdc_rx(port)) {
/*
* PDC receive. Just schedule the tasklet and let it
* figure out the details.
@@ -591,6 +992,13 @@ atmel_handle_receive(struct uart_port *port, unsigned int pending)
atmel_pdc_rxerr(port, pending);
}
+ if (atmel_use_dma_rx(port)) {
+ if (pending & ATMEL_US_TIMEOUT) {
+ UART_PUT_IDR(port, ATMEL_US_TIMEOUT);
+ tasklet_schedule(&atmel_port->tasklet);
+ }
+ }
+
/* Interrupt receive */
if (pending & ATMEL_US_RXRDY)
atmel_rx_chars(port);
@@ -658,10 +1066,21 @@ static irqreturn_t atmel_interrupt(int irq, void *dev_id)
return pass_counter ? IRQ_HANDLED : IRQ_NONE;
}
+static void atmel_release_tx_pdc(struct uart_port *port)
+{
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+ struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx;
+
+ dma_unmap_single(port->dev,
+ pdc->dma_addr,
+ pdc->dma_size,
+ DMA_TO_DEVICE);
+}
+
/*
* Called from tasklet with ENDTX and TXBUFE interrupts disabled.
*/
-static void atmel_tx_dma(struct uart_port *port)
+static void atmel_tx_pdc(struct uart_port *port)
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
struct circ_buf *xmit = &port->state->xmit;
@@ -710,6 +1129,23 @@ static void atmel_tx_dma(struct uart_port *port)
uart_write_wakeup(port);
}
+static int atmel_prepare_tx_pdc(struct uart_port *port)
+{
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+ struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx;
+ struct circ_buf *xmit = &port->state->xmit;
+
+ pdc->buf = xmit->buf;
+ pdc->dma_addr = dma_map_single(port->dev,
+ pdc->buf,
+ UART_XMIT_SIZE,
+ DMA_TO_DEVICE);
+ pdc->dma_size = UART_XMIT_SIZE;
+ pdc->ofs = 0;
+
+ return 0;
+}
+
static void atmel_rx_from_ring(struct uart_port *port)
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
@@ -778,7 +1214,26 @@ static void atmel_rx_from_ring(struct uart_port *port)
spin_lock(&port->lock);
}
-static void atmel_rx_from_dma(struct uart_port *port)
+static void atmel_release_rx_pdc(struct uart_port *port)
+{
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+ int i;
+
+ for (i = 0; i < 2; i++) {
+ struct atmel_dma_buffer *pdc = &atmel_port->pdc_rx[i];
+
+ dma_unmap_single(port->dev,
+ pdc->dma_addr,
+ pdc->dma_size,
+ DMA_FROM_DEVICE);
+ kfree(pdc->buf);
+ }
+
+ if (!atmel_port->is_usart)
+ del_timer_sync(&atmel_port->uart_timer);
+}
+
+static void atmel_rx_from_pdc(struct uart_port *port)
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
struct tty_port *tport = &port->state->port;
@@ -855,6 +1310,45 @@ static void atmel_rx_from_dma(struct uart_port *port)
UART_PUT_IER(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT);
}
+static int atmel_prepare_rx_pdc(struct uart_port *port)
+{
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+ int i;
+
+ for (i = 0; i < 2; i++) {
+ struct atmel_dma_buffer *pdc = &atmel_port->pdc_rx[i];
+
+ pdc->buf = kmalloc(PDC_BUFFER_SIZE, GFP_KERNEL);
+ if (pdc->buf == NULL) {
+ if (i != 0) {
+ dma_unmap_single(port->dev,
+ atmel_port->pdc_rx[0].dma_addr,
+ PDC_BUFFER_SIZE,
+ DMA_FROM_DEVICE);
+ kfree(atmel_port->pdc_rx[0].buf);
+ }
+ atmel_port->use_pdc_rx = 0;
+ return -ENOMEM;
+ }
+ pdc->dma_addr = dma_map_single(port->dev,
+ pdc->buf,
+ PDC_BUFFER_SIZE,
+ DMA_FROM_DEVICE);
+ pdc->dma_size = PDC_BUFFER_SIZE;
+ pdc->ofs = 0;
+ }
+
+ atmel_port->pdc_rx_idx = 0;
+
+ UART_PUT_RPR(port, atmel_port->pdc_rx[0].dma_addr);
+ UART_PUT_RCR(port, PDC_BUFFER_SIZE);
+
+ UART_PUT_RNPR(port, atmel_port->pdc_rx[1].dma_addr);
+ UART_PUT_RNCR(port, PDC_BUFFER_SIZE);
+
+ return 0;
+}
+
/*
* tasklet handling tty stuff outside the interrupt handler.
*/
@@ -868,10 +1362,7 @@ static void atmel_tasklet_func(unsigned long data)
/* The interrupt handler does not take the lock */
spin_lock(&port->lock);
- if (atmel_use_dma_tx(port))
- atmel_tx_dma(port);
- else
- atmel_tx_chars(port);
+ atmel_port->schedule_tx(port);
status = atmel_port->irq_status;
status_change = status ^ atmel_port->irq_status_prev;
@@ -893,19 +1384,152 @@ static void atmel_tasklet_func(unsigned long data)
atmel_port->irq_status_prev = status;
}
- if (atmel_use_dma_rx(port))
- atmel_rx_from_dma(port);
- else
- atmel_rx_from_ring(port);
+ atmel_port->schedule_rx(port);
spin_unlock(&port->lock);
}
+static int atmel_init_property(struct atmel_uart_port *atmel_port,
+ struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct atmel_uart_data *pdata = dev_get_platdata(&pdev->dev);
+
+ if (np) {
+ /* DMA/PDC usage specification */
+ if (of_get_property(np, "atmel,use-dma-rx", NULL)) {
+ if (of_get_property(np, "dmas", NULL)) {
+ atmel_port->use_dma_rx = true;
+ atmel_port->use_pdc_rx = false;
+ } else {
+ atmel_port->use_dma_rx = false;
+ atmel_port->use_pdc_rx = true;
+ }
+ } else {
+ atmel_port->use_dma_rx = false;
+ atmel_port->use_pdc_rx = false;
+ }
+
+ if (of_get_property(np, "atmel,use-dma-tx", NULL)) {
+ if (of_get_property(np, "dmas", NULL)) {
+ atmel_port->use_dma_tx = true;
+ atmel_port->use_pdc_tx = false;
+ } else {
+ atmel_port->use_dma_tx = false;
+ atmel_port->use_pdc_tx = true;
+ }
+ } else {
+ atmel_port->use_dma_tx = false;
+ atmel_port->use_pdc_tx = false;
+ }
+
+ } else {
+ atmel_port->use_pdc_rx = pdata->use_dma_rx;
+ atmel_port->use_pdc_tx = pdata->use_dma_tx;
+ atmel_port->use_dma_rx = false;
+ atmel_port->use_dma_tx = false;
+ }
+
+ return 0;
+}
+
+static void atmel_init_rs485(struct atmel_uart_port *atmel_port,
+ struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct atmel_uart_data *pdata = dev_get_platdata(&pdev->dev);
+
+ if (np) {
+ u32 rs485_delay[2];
+ /* rs485 properties */
+ if (of_property_read_u32_array(np, "rs485-rts-delay",
+ rs485_delay, 2) == 0) {
+ struct serial_rs485 *rs485conf = &atmel_port->rs485;
+
+ rs485conf->delay_rts_before_send = rs485_delay[0];
+ rs485conf->delay_rts_after_send = rs485_delay[1];
+ rs485conf->flags = 0;
+
+ if (of_get_property(np, "rs485-rx-during-tx", NULL))
+ rs485conf->flags |= SER_RS485_RX_DURING_TX;
+
+ if (of_get_property(np, "linux,rs485-enabled-at-boot-time",
+ NULL))
+ rs485conf->flags |= SER_RS485_ENABLED;
+ }
+ } else {
+ atmel_port->rs485 = pdata->rs485;
+ }
+
+}
+
+static void atmel_set_ops(struct uart_port *port)
+{
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
+ if (atmel_use_dma_rx(port)) {
+ atmel_port->prepare_rx = &atmel_prepare_rx_dma;
+ atmel_port->schedule_rx = &atmel_rx_from_dma;
+ atmel_port->release_rx = &atmel_release_rx_dma;
+ } else if (atmel_use_pdc_rx(port)) {
+ atmel_port->prepare_rx = &atmel_prepare_rx_pdc;
+ atmel_port->schedule_rx = &atmel_rx_from_pdc;
+ atmel_port->release_rx = &atmel_release_rx_pdc;
+ } else {
+ atmel_port->prepare_rx = NULL;
+ atmel_port->schedule_rx = &atmel_rx_from_ring;
+ atmel_port->release_rx = NULL;
+ }
+
+ if (atmel_use_dma_tx(port)) {
+ atmel_port->prepare_tx = &atmel_prepare_tx_dma;
+ atmel_port->schedule_tx = &atmel_tx_dma;
+ atmel_port->release_tx = &atmel_release_tx_dma;
+ } else if (atmel_use_pdc_tx(port)) {
+ atmel_port->prepare_tx = &atmel_prepare_tx_pdc;
+ atmel_port->schedule_tx = &atmel_tx_pdc;
+ atmel_port->release_tx = &atmel_release_tx_pdc;
+ } else {
+ atmel_port->prepare_tx = NULL;
+ atmel_port->schedule_tx = &atmel_tx_chars;
+ atmel_port->release_tx = NULL;
+ }
+}
+
+/*
+ * Get ip name usart or uart
+ */
+static int atmel_get_ip_name(struct uart_port *port)
+{
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+ int name = UART_GET_IP_NAME(port);
+ int usart, uart;
+ /* usart and uart ascii */
+ usart = 0x55534152;
+ uart = 0x44424755;
+
+ atmel_port->is_usart = false;
+
+ if (name == usart) {
+ dev_dbg(port->dev, "This is usart\n");
+ atmel_port->is_usart = true;
+ } else if (name == uart) {
+ dev_dbg(port->dev, "This is uart\n");
+ atmel_port->is_usart = false;
+ } else {
+ dev_err(port->dev, "Not supported ip name, set to uart\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
/*
* Perform initialization and enable port for reception
*/
static int atmel_startup(struct uart_port *port)
{
+ struct platform_device *pdev = to_platform_device(port->dev);
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
struct tty_struct *tty = port->state->port.tty;
int retval;
@@ -930,53 +1554,19 @@ static int atmel_startup(struct uart_port *port)
/*
* Initialize DMA (if necessary)
*/
- if (atmel_use_dma_rx(port)) {
- int i;
-
- for (i = 0; i < 2; i++) {
- struct atmel_dma_buffer *pdc = &atmel_port->pdc_rx[i];
-
- pdc->buf = kmalloc(PDC_BUFFER_SIZE, GFP_KERNEL);
- if (pdc->buf == NULL) {
- if (i != 0) {
- dma_unmap_single(port->dev,
- atmel_port->pdc_rx[0].dma_addr,
- PDC_BUFFER_SIZE,
- DMA_FROM_DEVICE);
- kfree(atmel_port->pdc_rx[0].buf);
- }
- free_irq(port->irq, port);
- return -ENOMEM;
- }
- pdc->dma_addr = dma_map_single(port->dev,
- pdc->buf,
- PDC_BUFFER_SIZE,
- DMA_FROM_DEVICE);
- pdc->dma_size = PDC_BUFFER_SIZE;
- pdc->ofs = 0;
- }
+ atmel_init_property(atmel_port, pdev);
- atmel_port->pdc_rx_idx = 0;
-
- UART_PUT_RPR(port, atmel_port->pdc_rx[0].dma_addr);
- UART_PUT_RCR(port, PDC_BUFFER_SIZE);
-
- UART_PUT_RNPR(port, atmel_port->pdc_rx[1].dma_addr);
- UART_PUT_RNCR(port, PDC_BUFFER_SIZE);
+ if (atmel_port->prepare_rx) {
+ retval = atmel_port->prepare_rx(port);
+ if (retval < 0)
+ atmel_set_ops(port);
}
- if (atmel_use_dma_tx(port)) {
- struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx;
- struct circ_buf *xmit = &port->state->xmit;
- pdc->buf = xmit->buf;
- pdc->dma_addr = dma_map_single(port->dev,
- pdc->buf,
- UART_XMIT_SIZE,
- DMA_TO_DEVICE);
- pdc->dma_size = UART_XMIT_SIZE;
- pdc->ofs = 0;
+ if (atmel_port->prepare_tx) {
+ retval = atmel_port->prepare_tx(port);
+ if (retval < 0)
+ atmel_set_ops(port);
}
-
/*
* If there is a specific "open" function (to register
* control line interrupts)
@@ -1000,14 +1590,38 @@ static int atmel_startup(struct uart_port *port)
/* enable xmit & rcvr */
UART_PUT_CR(port, ATMEL_US_TXEN | ATMEL_US_RXEN);
- if (atmel_use_dma_rx(port)) {
+ if (atmel_use_pdc_rx(port)) {
/* set UART timeout */
- UART_PUT_RTOR(port, PDC_RX_TIMEOUT);
- UART_PUT_CR(port, ATMEL_US_STTTO);
-
- UART_PUT_IER(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT);
+ if (!atmel_port->is_usart) {
+ setup_timer(&atmel_port->uart_timer,
+ atmel_uart_timer_callback,
+ (unsigned long)port);
+ mod_timer(&atmel_port->uart_timer,
+ jiffies + uart_poll_timeout(port));
+ /* set USART timeout */
+ } else {
+ UART_PUT_RTOR(port, PDC_RX_TIMEOUT);
+ UART_PUT_CR(port, ATMEL_US_STTTO);
+
+ UART_PUT_IER(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT);
+ }
/* enable PDC controller */
UART_PUT_PTCR(port, ATMEL_PDC_RXTEN);
+ } else if (atmel_use_dma_rx(port)) {
+ /* set UART timeout */
+ if (!atmel_port->is_usart) {
+ setup_timer(&atmel_port->uart_timer,
+ atmel_uart_timer_callback,
+ (unsigned long)port);
+ mod_timer(&atmel_port->uart_timer,
+ jiffies + uart_poll_timeout(port));
+ /* set USART timeout */
+ } else {
+ UART_PUT_RTOR(port, PDC_RX_TIMEOUT);
+ UART_PUT_CR(port, ATMEL_US_STTTO);
+
+ UART_PUT_IER(port, ATMEL_US_TIMEOUT);
+ }
} else {
/* enable receive only */
UART_PUT_IER(port, ATMEL_US_RXRDY);
@@ -1031,27 +1645,10 @@ static void atmel_shutdown(struct uart_port *port)
/*
* Shut-down the DMA.
*/
- if (atmel_use_dma_rx(port)) {
- int i;
-
- for (i = 0; i < 2; i++) {
- struct atmel_dma_buffer *pdc = &atmel_port->pdc_rx[i];
-
- dma_unmap_single(port->dev,
- pdc->dma_addr,
- pdc->dma_size,
- DMA_FROM_DEVICE);
- kfree(pdc->buf);
- }
- }
- if (atmel_use_dma_tx(port)) {
- struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx;
-
- dma_unmap_single(port->dev,
- pdc->dma_addr,
- pdc->dma_size,
- DMA_TO_DEVICE);
- }
+ if (atmel_port->release_rx)
+ atmel_port->release_rx(port);
+ if (atmel_port->release_tx)
+ atmel_port->release_tx(port);
/*
* Disable all interrupts, port and break condition.
@@ -1080,7 +1677,7 @@ static void atmel_flush_buffer(struct uart_port *port)
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
- if (atmel_use_dma_tx(port)) {
+ if (atmel_use_pdc_tx(port)) {
UART_PUT_TCR(port, 0);
atmel_port->pdc_tx.ofs = 0;
}
@@ -1193,7 +1790,7 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
if (termios->c_iflag & (BRKINT | PARMRK))
port->read_status_mask |= ATMEL_US_RXBRK;
- if (atmel_use_dma_rx(port))
+ if (atmel_use_pdc_rx(port))
/* need to enable error interrupts */
UART_PUT_IER(port, port->read_status_mask);
@@ -1423,38 +2020,6 @@ static struct uart_ops atmel_pops = {
#endif
};
-static void atmel_of_init_port(struct atmel_uart_port *atmel_port,
- struct device_node *np)
-{
- u32 rs485_delay[2];
-
- /* DMA/PDC usage specification */
- if (of_get_property(np, "atmel,use-dma-rx", NULL))
- atmel_port->use_dma_rx = 1;
- else
- atmel_port->use_dma_rx = 0;
- if (of_get_property(np, "atmel,use-dma-tx", NULL))
- atmel_port->use_dma_tx = 1;
- else
- atmel_port->use_dma_tx = 0;
-
- /* rs485 properties */
- if (of_property_read_u32_array(np, "rs485-rts-delay",
- rs485_delay, 2) == 0) {
- struct serial_rs485 *rs485conf = &atmel_port->rs485;
-
- rs485conf->delay_rts_before_send = rs485_delay[0];
- rs485conf->delay_rts_after_send = rs485_delay[1];
- rs485conf->flags = 0;
-
- if (of_get_property(np, "rs485-rx-during-tx", NULL))
- rs485conf->flags |= SER_RS485_RX_DURING_TX;
-
- if (of_get_property(np, "linux,rs485-enabled-at-boot-time", NULL))
- rs485conf->flags |= SER_RS485_ENABLED;
- }
-}
-
/*
* Configure the port from the platform device resource info.
*/
@@ -1463,15 +2028,12 @@ static int atmel_init_port(struct atmel_uart_port *atmel_port,
{
int ret;
struct uart_port *port = &atmel_port->uart;
- struct atmel_uart_data *pdata = pdev->dev.platform_data;
+ struct atmel_uart_data *pdata = dev_get_platdata(&pdev->dev);
- if (pdev->dev.of_node) {
- atmel_of_init_port(atmel_port, pdev->dev.of_node);
- } else {
- atmel_port->use_dma_rx = pdata->use_dma_rx;
- atmel_port->use_dma_tx = pdata->use_dma_tx;
- atmel_port->rs485 = pdata->rs485;
- }
+ if (!atmel_init_property(atmel_port, pdev))
+ atmel_set_ops(port);
+
+ atmel_init_rs485(atmel_port, pdev);
port->iotype = UPIO_MEM;
port->flags = UPF_BOOT_AUTOCONF;
@@ -1516,7 +2078,7 @@ static int atmel_init_port(struct atmel_uart_port *atmel_port,
/* Use TXEMPTY for interrupt when rs485 else TXRDY or ENDTX|TXBUFE */
if (atmel_port->rs485.flags & SER_RS485_ENABLED)
atmel_port->tx_done_mask = ATMEL_US_TXEMPTY;
- else if (atmel_use_dma_tx(port)) {
+ else if (atmel_use_pdc_tx(port)) {
port->fifosize = PDC_BUFFER_SIZE;
atmel_port->tx_done_mask = ATMEL_US_ENDTX | ATMEL_US_TXBUFE;
} else {
@@ -1664,7 +2226,7 @@ static int __init atmel_console_init(void)
int ret;
if (atmel_default_console_device) {
struct atmel_uart_data *pdata =
- atmel_default_console_device->dev.platform_data;
+ dev_get_platdata(&atmel_default_console_device->dev);
int id = pdata->num;
struct atmel_uart_port *port = &atmel_ports[id];
@@ -1772,10 +2334,9 @@ static int atmel_serial_probe(struct platform_device *pdev)
{
struct atmel_uart_port *port;
struct device_node *np = pdev->dev.of_node;
- struct atmel_uart_data *pdata = pdev->dev.platform_data;
+ struct atmel_uart_data *pdata = dev_get_platdata(&pdev->dev);
void *data;
int ret = -ENODEV;
- struct pinctrl *pinctrl;
BUILD_BUG_ON(ATMEL_SERIAL_RINGSIZE & (ATMEL_SERIAL_RINGSIZE - 1));
@@ -1809,13 +2370,7 @@ static int atmel_serial_probe(struct platform_device *pdev)
if (ret)
goto err;
- pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
- if (IS_ERR(pinctrl)) {
- ret = PTR_ERR(pinctrl);
- goto err;
- }
-
- if (!atmel_use_dma_rx(&port->uart)) {
+ if (!atmel_use_pdc_rx(&port->uart)) {
ret = -ENOMEM;
data = kmalloc(sizeof(struct atmel_uart_char)
* ATMEL_SERIAL_RINGSIZE, GFP_KERNEL);
@@ -1847,6 +2402,13 @@ static int atmel_serial_probe(struct platform_device *pdev)
UART_PUT_CR(&port->uart, ATMEL_US_RTSEN);
}
+ /*
+ * Get port name of usart or uart
+ */
+ ret = atmel_get_ip_name(&port->uart);
+ if (ret < 0)
+ goto err_add_port;
+
return 0;
err_add_port:
@@ -1868,7 +2430,6 @@ static int atmel_serial_remove(struct platform_device *pdev)
int ret = 0;
device_init_wakeup(&pdev->dev, 0);
- platform_set_drvdata(pdev, NULL);
ret = uart_remove_one_port(&atmel_uart, port);
diff --git a/drivers/tty/serial/bcm63xx_uart.c b/drivers/tty/serial/bcm63xx_uart.c
index 6fa2ae77..649d512 100644
--- a/drivers/tty/serial/bcm63xx_uart.c
+++ b/drivers/tty/serial/bcm63xx_uart.c
@@ -302,7 +302,9 @@ static void bcm_uart_do_rx(struct uart_port *port)
} while (--max_count);
+ spin_unlock(&port->lock);
tty_flip_buffer_push(tty_port);
+ spin_lock(&port->lock);
}
/*
@@ -852,7 +854,6 @@ static int bcm_uart_remove(struct platform_device *pdev)
port = platform_get_drvdata(pdev);
uart_remove_one_port(&bcm_uart_driver, port);
- platform_set_drvdata(pdev, NULL);
/* mark port as free */
ports[pdev->id].membase = 0;
return 0;
diff --git a/drivers/tty/serial/bfin_sport_uart.c b/drivers/tty/serial/bfin_sport_uart.c
index 487c173..87636cc 100644
--- a/drivers/tty/serial/bfin_sport_uart.c
+++ b/drivers/tty/serial/bfin_sport_uart.c
@@ -161,11 +161,12 @@ static irqreturn_t sport_uart_rx_irq(int irq, void *dev_id)
if (!uart_handle_sysrq_char(&up->port, ch))
tty_insert_flip_char(port, ch, TTY_NORMAL);
}
- /* XXX this won't deadlock with lowlat? */
- tty_flip_buffer_push(port);
spin_unlock(&up->port.lock);
+ /* XXX this won't deadlock with lowlat? */
+ tty_flip_buffer_push(port);
+
return IRQ_HANDLED;
}
@@ -766,7 +767,8 @@ static int sport_uart_probe(struct platform_device *pdev)
}
ret = peripheral_request_list(
- (unsigned short *)pdev->dev.platform_data, DRV_NAME);
+ (unsigned short *)dev_get_platdata(&pdev->dev),
+ DRV_NAME);
if (ret) {
dev_err(&pdev->dev,
"Fail to request SPORT peripherals\n");
@@ -843,7 +845,7 @@ out_error_unmap:
iounmap(sport->port.membase);
out_error_free_peripherals:
peripheral_free_list(
- (unsigned short *)pdev->dev.platform_data);
+ (unsigned short *)dev_get_platdata(&pdev->dev));
out_error_free_mem:
kfree(sport);
bfin_sport_uart_ports[pdev->id] = NULL;
@@ -863,7 +865,7 @@ static int sport_uart_remove(struct platform_device *pdev)
uart_remove_one_port(&sport_uart_reg, &sport->port);
iounmap(sport->port.membase);
peripheral_free_list(
- (unsigned short *)pdev->dev.platform_data);
+ (unsigned short *)dev_get_platdata(&pdev->dev));
kfree(sport);
bfin_sport_uart_ports[pdev->id] = NULL;
}
@@ -883,7 +885,7 @@ static struct platform_driver sport_uart_driver = {
};
#ifdef CONFIG_SERIAL_BFIN_SPORT_CONSOLE
-static __initdata struct early_platform_driver early_sport_uart_driver = {
+static struct early_platform_driver early_sport_uart_driver __initdata = {
.class_str = CLASS_BFIN_SPORT_CONSOLE,
.pdrv = &sport_uart_driver,
.requested_id = EARLY_PLATFORM_ID_UNSET,
diff --git a/drivers/tty/serial/bfin_uart.c b/drivers/tty/serial/bfin_uart.c
index 26a3be7..3c75e8e 100644
--- a/drivers/tty/serial/bfin_uart.c
+++ b/drivers/tty/serial/bfin_uart.c
@@ -41,10 +41,6 @@
# undef CONFIG_EARLY_PRINTK
#endif
-#ifdef CONFIG_SERIAL_BFIN_MODULE
-# undef CONFIG_EARLY_PRINTK
-#endif
-
/* UART name and device definitions */
#define BFIN_SERIAL_DEV_NAME "ttyBF"
#define BFIN_SERIAL_MAJOR 204
@@ -1180,7 +1176,7 @@ bfin_earlyprintk_console_write(struct console *co, const char *s, unsigned int c
* don't let the common infrastructure play with things. (see calls to setup
* & earlysetup in ./kernel/printk.c:register_console()
*/
-static struct __initdata console bfin_early_serial_console = {
+static struct console bfin_early_serial_console __initdata = {
.name = "early_BFuart",
.write = bfin_earlyprintk_console_write,
.device = uart_console_device,
@@ -1244,7 +1240,8 @@ static int bfin_serial_probe(struct platform_device *pdev)
*/
#endif
ret = peripheral_request_list(
- (unsigned short *)pdev->dev.platform_data, DRIVER_NAME);
+ (unsigned short *)dev_get_platdata(&pdev->dev),
+ DRIVER_NAME);
if (ret) {
dev_err(&pdev->dev,
"fail to request bfin serial peripherals\n");
@@ -1362,7 +1359,7 @@ out_error_unmap:
iounmap(uart->port.membase);
out_error_free_peripherals:
peripheral_free_list(
- (unsigned short *)pdev->dev.platform_data);
+ (unsigned short *)dev_get_platdata(&pdev->dev));
out_error_free_mem:
kfree(uart);
bfin_serial_ports[pdev->id] = NULL;
@@ -1381,7 +1378,7 @@ static int bfin_serial_remove(struct platform_device *pdev)
uart_remove_one_port(&bfin_serial_reg, &uart->port);
iounmap(uart->port.membase);
peripheral_free_list(
- (unsigned short *)pdev->dev.platform_data);
+ (unsigned short *)dev_get_platdata(&pdev->dev));
kfree(uart);
bfin_serial_ports[pdev->id] = NULL;
}
@@ -1401,7 +1398,7 @@ static struct platform_driver bfin_serial_driver = {
};
#if defined(CONFIG_SERIAL_BFIN_CONSOLE)
-static __initdata struct early_platform_driver early_bfin_serial_driver = {
+static struct early_platform_driver early_bfin_serial_driver __initdata = {
.class_str = CLASS_BFIN_CONSOLE,
.pdrv = &bfin_serial_driver,
.requested_id = EARLY_PLATFORM_ID_UNSET,
@@ -1436,7 +1433,7 @@ static int bfin_earlyprintk_probe(struct platform_device *pdev)
}
ret = peripheral_request_list(
- (unsigned short *)pdev->dev.platform_data, DRIVER_NAME);
+ (unsigned short *)dev_get_platdata(&pdev->dev), DRIVER_NAME);
if (ret) {
dev_err(&pdev->dev,
"fail to request bfin serial peripherals\n");
@@ -1467,7 +1464,7 @@ static int bfin_earlyprintk_probe(struct platform_device *pdev)
out_error_free_peripherals:
peripheral_free_list(
- (unsigned short *)pdev->dev.platform_data);
+ (unsigned short *)dev_get_platdata(&pdev->dev));
return ret;
}
@@ -1480,7 +1477,7 @@ static struct platform_driver bfin_earlyprintk_driver = {
},
};
-static __initdata struct early_platform_driver early_bfin_earlyprintk_driver = {
+static struct early_platform_driver early_bfin_earlyprintk_driver __initdata = {
.class_str = CLASS_BFIN_EARLYPRINTK,
.pdrv = &bfin_earlyprintk_driver,
.requested_id = EARLY_PLATFORM_ID_UNSET,
diff --git a/drivers/tty/serial/clps711x.c b/drivers/tty/serial/clps711x.c
index bfb1796..7e4e408 100644
--- a/drivers/tty/serial/clps711x.c
+++ b/drivers/tty/serial/clps711x.c
@@ -438,8 +438,7 @@ static int uart_clps711x_probe(struct platform_device *pdev)
s->uart_clk = devm_clk_get(&pdev->dev, "uart");
if (IS_ERR(s->uart_clk)) {
dev_err(&pdev->dev, "Can't get UART clocks\n");
- ret = PTR_ERR(s->uart_clk);
- goto err_out;
+ return PTR_ERR(s->uart_clk);
}
s->uart.owner = THIS_MODULE;
@@ -461,7 +460,7 @@ static int uart_clps711x_probe(struct platform_device *pdev)
if (ret) {
dev_err(&pdev->dev, "Registering UART driver failed\n");
devm_clk_put(&pdev->dev, s->uart_clk);
- goto err_out;
+ return ret;
}
for (i = 0; i < UART_CLPS711X_NR; i++) {
@@ -478,11 +477,6 @@ static int uart_clps711x_probe(struct platform_device *pdev)
}
return 0;
-
-err_out:
- platform_set_drvdata(pdev, NULL);
-
- return ret;
}
static int uart_clps711x_remove(struct platform_device *pdev)
@@ -495,7 +489,6 @@ static int uart_clps711x_remove(struct platform_device *pdev)
devm_clk_put(&pdev->dev, s->uart_clk);
uart_unregister_driver(&s->uart);
- platform_set_drvdata(pdev, NULL);
return 0;
}
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
index f7672ca..1a535f7 100644
--- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
@@ -1213,8 +1213,32 @@ static int cpm_uart_init_port(struct device_node *np,
goto out_pram;
}
- for (i = 0; i < NUM_GPIOS; i++)
- pinfo->gpios[i] = of_get_gpio(np, i);
+ for (i = 0; i < NUM_GPIOS; i++) {
+ int gpio;
+
+ pinfo->gpios[i] = -1;
+
+ gpio = of_get_gpio(np, i);
+
+ if (gpio_is_valid(gpio)) {
+ ret = gpio_request(gpio, "cpm_uart");
+ if (ret) {
+ pr_err("can't request gpio #%d: %d\n", i, ret);
+ continue;
+ }
+ if (i == GPIO_RTS || i == GPIO_DTR)
+ ret = gpio_direction_output(gpio, 0);
+ else
+ ret = gpio_direction_input(gpio);
+ if (ret) {
+ pr_err("can't set direction for gpio #%d: %d\n",
+ i, ret);
+ gpio_free(gpio);
+ continue;
+ }
+ pinfo->gpios[i] = gpio;
+ }
+ }
#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
udbg_putc = NULL;
diff --git a/drivers/tty/serial/efm32-uart.c b/drivers/tty/serial/efm32-uart.c
index 7d199c8..0eb5b56 100644
--- a/drivers/tty/serial/efm32-uart.c
+++ b/drivers/tty/serial/efm32-uart.c
@@ -268,10 +268,10 @@ static irqreturn_t efm32_uart_rxirq(int irq, void *data)
handled = IRQ_HANDLED;
}
- tty_flip_buffer_push(tport);
-
spin_unlock(&port->lock);
+ tty_flip_buffer_push(tport);
+
return handled;
}
@@ -698,6 +698,7 @@ static int efm32_uart_probe(struct platform_device *pdev)
{
struct efm32_uart_port *efm_port;
struct resource *res;
+ unsigned int line;
int ret;
efm_port = kzalloc(sizeof(*efm_port), GFP_KERNEL);
@@ -750,18 +751,21 @@ static int efm32_uart_probe(struct platform_device *pdev)
if (pdata)
efm_port->pdata = *pdata;
- }
+ } else if (ret < 0)
+ goto err_probe_dt;
+
+ line = efm_port->port.line;
- if (efm_port->port.line >= 0 &&
- efm_port->port.line < ARRAY_SIZE(efm32_uart_ports))
- efm32_uart_ports[efm_port->port.line] = efm_port;
+ if (line >= 0 && line < ARRAY_SIZE(efm32_uart_ports))
+ efm32_uart_ports[line] = efm_port;
ret = uart_add_one_port(&efm32_uart_reg, &efm_port->port);
if (ret) {
dev_dbg(&pdev->dev, "failed to add port: %d\n", ret);
- if (pdev->id >= 0 && pdev->id < ARRAY_SIZE(efm32_uart_ports))
- efm32_uart_ports[pdev->id] = NULL;
+ if (line >= 0 && line < ARRAY_SIZE(efm32_uart_ports))
+ efm32_uart_ports[line] = NULL;
+err_probe_dt:
err_get_rxirq:
err_too_small:
err_get_base:
@@ -777,20 +781,19 @@ err_get_base:
static int efm32_uart_remove(struct platform_device *pdev)
{
struct efm32_uart_port *efm_port = platform_get_drvdata(pdev);
-
- platform_set_drvdata(pdev, NULL);
+ unsigned int line = efm_port->port.line;
uart_remove_one_port(&efm32_uart_reg, &efm_port->port);
- if (pdev->id >= 0 && pdev->id < ARRAY_SIZE(efm32_uart_ports))
- efm32_uart_ports[pdev->id] = NULL;
+ if (line >= 0 && line < ARRAY_SIZE(efm32_uart_ports))
+ efm32_uart_ports[line] = NULL;
kfree(efm_port);
return 0;
}
-static struct of_device_id efm32_uart_dt_ids[] = {
+static const struct of_device_id efm32_uart_dt_ids[] = {
{
.compatible = "efm32,uart",
}, {
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 263cfaa..8978dc9a 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -342,8 +342,10 @@ static void lpuart_break_ctl(struct uart_port *port, int break_state)
static void lpuart_setup_watermark(struct lpuart_port *sport)
{
unsigned char val, cr2;
+ unsigned char cr2_saved;
cr2 = readb(sport->port.membase + UARTCR2);
+ cr2_saved = cr2;
cr2 &= ~(UARTCR2_TIE | UARTCR2_TCIE | UARTCR2_TE |
UARTCR2_RIE | UARTCR2_RE);
writeb(cr2, sport->port.membase + UARTCR2);
@@ -366,6 +368,9 @@ static void lpuart_setup_watermark(struct lpuart_port *sport)
writeb(2, sport->port.membase + UARTTWFIFO);
writeb(1, sport->port.membase + UARTRWFIFO);
+
+ /* Restore cr2 */
+ writeb(cr2_saved, sport->port.membase + UARTCR2);
}
static int lpuart_startup(struct uart_port *port)
@@ -858,7 +863,7 @@ static int __init lpuart_serial_init(void)
if (ret)
uart_unregister_driver(&lpuart_reg);
- return 0;
+ return ret;
}
static void __exit lpuart_serial_exit(void)
diff --git a/drivers/tty/serial/icom.c b/drivers/tty/serial/icom.c
index 18ed5ae..d98e433 100644
--- a/drivers/tty/serial/icom.c
+++ b/drivers/tty/serial/icom.c
@@ -105,7 +105,7 @@ static const struct pci_device_id icom_pci_table[] = {
{}
};
-struct lookup_proc_table start_proc[4] = {
+static struct lookup_proc_table start_proc[4] = {
{NULL, ICOM_CONTROL_START_A},
{NULL, ICOM_CONTROL_START_B},
{NULL, ICOM_CONTROL_START_C},
@@ -113,14 +113,14 @@ struct lookup_proc_table start_proc[4] = {
};
-struct lookup_proc_table stop_proc[4] = {
+static struct lookup_proc_table stop_proc[4] = {
{NULL, ICOM_CONTROL_STOP_A},
{NULL, ICOM_CONTROL_STOP_B},
{NULL, ICOM_CONTROL_STOP_C},
{NULL, ICOM_CONTROL_STOP_D}
};
-struct lookup_int_table int_mask_tbl[4] = {
+static struct lookup_int_table int_mask_tbl[4] = {
{NULL, ICOM_INT_MASK_PRC_A},
{NULL, ICOM_INT_MASK_PRC_B},
{NULL, ICOM_INT_MASK_PRC_C},
@@ -297,25 +297,25 @@ static void stop_processor(struct icom_port *icom_port)
spin_lock_irqsave(&icom_lock, flags);
port = icom_port->port;
+ if (port >= ARRAY_SIZE(stop_proc)) {
+ dev_err(&icom_port->adapter->pci_dev->dev,
+ "Invalid port assignment\n");
+ goto unlock;
+ }
+
if (port == 0 || port == 1)
stop_proc[port].global_control_reg = &icom_port->global_reg->control;
else
stop_proc[port].global_control_reg = &icom_port->global_reg->control_2;
+ temp = readl(stop_proc[port].global_control_reg);
+ temp = (temp & ~start_proc[port].processor_id) | stop_proc[port].processor_id;
+ writel(temp, stop_proc[port].global_control_reg);
- if (port < 4) {
- temp = readl(stop_proc[port].global_control_reg);
- temp =
- (temp & ~start_proc[port].processor_id) | stop_proc[port].processor_id;
- writel(temp, stop_proc[port].global_control_reg);
-
- /* write flush */
- readl(stop_proc[port].global_control_reg);
- } else {
- dev_err(&icom_port->adapter->pci_dev->dev,
- "Invalid port assignment\n");
- }
+ /* write flush */
+ readl(stop_proc[port].global_control_reg);
+unlock:
spin_unlock_irqrestore(&icom_lock, flags);
}
@@ -328,23 +328,25 @@ static void start_processor(struct icom_port *icom_port)
spin_lock_irqsave(&icom_lock, flags);
port = icom_port->port;
+ if (port >= ARRAY_SIZE(start_proc)) {
+ dev_err(&icom_port->adapter->pci_dev->dev,
+ "Invalid port assignment\n");
+ goto unlock;
+ }
+
if (port == 0 || port == 1)
start_proc[port].global_control_reg = &icom_port->global_reg->control;
else
start_proc[port].global_control_reg = &icom_port->global_reg->control_2;
- if (port < 4) {
- temp = readl(start_proc[port].global_control_reg);
- temp =
- (temp & ~stop_proc[port].processor_id) | start_proc[port].processor_id;
- writel(temp, start_proc[port].global_control_reg);
- /* write flush */
- readl(start_proc[port].global_control_reg);
- } else {
- dev_err(&icom_port->adapter->pci_dev->dev,
- "Invalid port assignment\n");
- }
+ temp = readl(start_proc[port].global_control_reg);
+ temp = (temp & ~stop_proc[port].processor_id) | start_proc[port].processor_id;
+ writel(temp, start_proc[port].global_control_reg);
+
+ /* write flush */
+ readl(start_proc[port].global_control_reg);
+unlock:
spin_unlock_irqrestore(&icom_lock, flags);
}
@@ -557,6 +559,12 @@ static int startup(struct icom_port *icom_port)
*/
spin_lock_irqsave(&icom_lock, flags);
port = icom_port->port;
+ if (port >= ARRAY_SIZE(int_mask_tbl)) {
+ dev_err(&icom_port->adapter->pci_dev->dev,
+ "Invalid port assignment\n");
+ goto unlock;
+ }
+
if (port == 0 || port == 1)
int_mask_tbl[port].global_int_mask = &icom_port->global_reg->int_mask;
else
@@ -566,17 +574,14 @@ static int startup(struct icom_port *icom_port)
writew(0x00FF, icom_port->int_reg);
else
writew(0x3F00, icom_port->int_reg);
- if (port < 4) {
- temp = readl(int_mask_tbl[port].global_int_mask);
- writel(temp & ~int_mask_tbl[port].processor_id, int_mask_tbl[port].global_int_mask);
- /* write flush */
- readl(int_mask_tbl[port].global_int_mask);
- } else {
- dev_err(&icom_port->adapter->pci_dev->dev,
- "Invalid port assignment\n");
- }
+ temp = readl(int_mask_tbl[port].global_int_mask);
+ writel(temp & ~int_mask_tbl[port].processor_id, int_mask_tbl[port].global_int_mask);
+ /* write flush */
+ readl(int_mask_tbl[port].global_int_mask);
+
+unlock:
spin_unlock_irqrestore(&icom_lock, flags);
return 0;
}
@@ -595,21 +600,23 @@ static void shutdown(struct icom_port *icom_port)
* disable all interrupts
*/
port = icom_port->port;
+ if (port >= ARRAY_SIZE(int_mask_tbl)) {
+ dev_err(&icom_port->adapter->pci_dev->dev,
+ "Invalid port assignment\n");
+ goto unlock;
+ }
if (port == 0 || port == 1)
int_mask_tbl[port].global_int_mask = &icom_port->global_reg->int_mask;
else
int_mask_tbl[port].global_int_mask = &icom_port->global_reg->int_mask_2;
- if (port < 4) {
- temp = readl(int_mask_tbl[port].global_int_mask);
- writel(temp | int_mask_tbl[port].processor_id, int_mask_tbl[port].global_int_mask);
+ temp = readl(int_mask_tbl[port].global_int_mask);
+ writel(temp | int_mask_tbl[port].processor_id, int_mask_tbl[port].global_int_mask);
- /* write flush */
- readl(int_mask_tbl[port].global_int_mask);
- } else {
- dev_err(&icom_port->adapter->pci_dev->dev,
- "Invalid port assignment\n");
- }
+ /* write flush */
+ readl(int_mask_tbl[port].global_int_mask);
+
+unlock:
spin_unlock_irqrestore(&icom_lock, flags);
/*
@@ -834,7 +841,10 @@ ignore_char:
status = cpu_to_le16(icom_port->statStg->rcv[rcv_buff].flags);
}
icom_port->next_rcv = rcv_buff;
+
+ spin_unlock(&icom_port->uart_port.lock);
tty_flip_buffer_push(port);
+ spin_lock(&icom_port->uart_port.lock);
}
static void process_interrupt(u16 port_int_reg,
@@ -1087,8 +1097,7 @@ static void icom_close(struct uart_port *port)
/* stop receiver */
cmdReg = readb(&ICOM_PORT->dram->CmdReg);
- writeb(cmdReg & (unsigned char) ~CMD_RCV_ENABLE,
- &ICOM_PORT->dram->CmdReg);
+ writeb(cmdReg & ~CMD_RCV_ENABLE, &ICOM_PORT->dram->CmdReg);
shutdown(ICOM_PORT);
@@ -1567,7 +1576,7 @@ static int icom_probe(struct pci_dev *dev,
icom_port->uart_port.type = PORT_ICOM;
icom_port->uart_port.iotype = UPIO_MEM;
icom_port->uart_port.membase =
- (char *) icom_adapter->base_addr_pci;
+ (unsigned char __iomem *)icom_adapter->base_addr_pci;
icom_port->uart_port.fifosize = 16;
icom_port->uart_port.ops = &icom_ops;
icom_port->uart_port.line =
diff --git a/drivers/tty/serial/ifx6x60.c b/drivers/tty/serial/ifx6x60.c
index 8b1534c..af286e6 100644
--- a/drivers/tty/serial/ifx6x60.c
+++ b/drivers/tty/serial/ifx6x60.c
@@ -1008,7 +1008,7 @@ static int ifx_spi_spi_probe(struct spi_device *spi)
return -ENODEV;
}
- pl_data = (struct ifx_modem_platform_data *)spi->dev.platform_data;
+ pl_data = (struct ifx_modem_platform_data *)dev_get_platdata(&spi->dev);
if (!pl_data) {
dev_err(&spi->dev, "missing platform data!");
return -ENODEV;
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 415cec6..a0ebbc9 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -47,11 +47,12 @@
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_device.h>
-#include <linux/pinctrl/consumer.h>
#include <linux/io.h>
+#include <linux/dma-mapping.h>
#include <asm/irq.h>
#include <linux/platform_data/serial-imx.h>
+#include <linux/platform_data/dma-imx.h>
/* Register definitions */
#define URXD0 0x0 /* Receiver Register */
@@ -83,6 +84,7 @@
#define UCR1_ADBR (1<<14) /* Auto detect baud rate */
#define UCR1_TRDYEN (1<<13) /* Transmitter ready interrupt enable */
#define UCR1_IDEN (1<<12) /* Idle condition interrupt */
+#define UCR1_ICD_REG(x) (((x) & 3) << 10) /* idle condition detect */
#define UCR1_RRDYEN (1<<9) /* Recv ready interrupt enable */
#define UCR1_RDMAEN (1<<8) /* Recv ready DMA enable */
#define UCR1_IREN (1<<7) /* Infrared interface enable */
@@ -91,6 +93,7 @@
#define UCR1_SNDBRK (1<<4) /* Send break */
#define UCR1_TDMAEN (1<<3) /* Transmitter ready DMA enable */
#define IMX1_UCR1_UARTCLKEN (1<<2) /* UART clock enabled, i.mx1 only */
+#define UCR1_ATDMAEN (1<<2) /* Aging DMA Timer Enable */
#define UCR1_DOZE (1<<1) /* Doze */
#define UCR1_UARTEN (1<<0) /* UART enabled */
#define UCR2_ESCI (1<<15) /* Escape seq interrupt enable */
@@ -126,6 +129,7 @@
#define UCR4_ENIRI (1<<8) /* Serial infrared interrupt enable */
#define UCR4_WKEN (1<<7) /* Wake interrupt enable */
#define UCR4_REF16 (1<<6) /* Ref freq 16 MHz */
+#define UCR4_IDDMAEN (1<<6) /* DMA IDLE Condition Detected */
#define UCR4_IRSC (1<<5) /* IR special case */
#define UCR4_TCEN (1<<3) /* Transmit complete interrupt enable */
#define UCR4_BKEN (1<<2) /* Break condition interrupt enable */
@@ -187,6 +191,7 @@
enum imx_uart_type {
IMX1_UART,
IMX21_UART,
+ IMX6Q_UART,
};
/* device type dependent stuff */
@@ -209,6 +214,19 @@ struct imx_port {
struct clk *clk_ipg;
struct clk *clk_per;
const struct imx_uart_data *devdata;
+
+ /* DMA fields */
+ unsigned int dma_is_inited:1;
+ unsigned int dma_is_enabled:1;
+ unsigned int dma_is_rxing:1;
+ unsigned int dma_is_txing:1;
+ struct dma_chan *dma_chan_rx, *dma_chan_tx;
+ struct scatterlist rx_sgl, tx_sgl[2];
+ void *rx_buf;
+ unsigned int rx_bytes, tx_bytes;
+ struct work_struct tsk_dma_rx, tsk_dma_tx;
+ unsigned int dma_tx_nents;
+ wait_queue_head_t dma_wait;
};
struct imx_port_ucrs {
@@ -232,6 +250,10 @@ static struct imx_uart_data imx_uart_devdata[] = {
.uts_reg = IMX21_UTS,
.devtype = IMX21_UART,
},
+ [IMX6Q_UART] = {
+ .uts_reg = IMX21_UTS,
+ .devtype = IMX6Q_UART,
+ },
};
static struct platform_device_id imx_uart_devtype[] = {
@@ -242,12 +264,16 @@ static struct platform_device_id imx_uart_devtype[] = {
.name = "imx21-uart",
.driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX21_UART],
}, {
+ .name = "imx6q-uart",
+ .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX6Q_UART],
+ }, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(platform, imx_uart_devtype);
static struct of_device_id imx_uart_dt_ids[] = {
+ { .compatible = "fsl,imx6q-uart", .data = &imx_uart_devdata[IMX6Q_UART], },
{ .compatible = "fsl,imx1-uart", .data = &imx_uart_devdata[IMX1_UART], },
{ .compatible = "fsl,imx21-uart", .data = &imx_uart_devdata[IMX21_UART], },
{ /* sentinel */ }
@@ -269,6 +295,10 @@ static inline int is_imx21_uart(struct imx_port *sport)
return sport->devdata->devtype == IMX21_UART;
}
+static inline int is_imx6q_uart(struct imx_port *sport)
+{
+ return sport->devdata->devtype == IMX6Q_UART;
+}
/*
* Save and restore functions for UCR1, UCR2 and UCR3 registers
*/
@@ -387,6 +417,13 @@ static void imx_stop_tx(struct uart_port *port)
return;
}
+ /*
+ * We are maybe in the SMP context, so if the DMA TX thread is running
+ * on other cpu, we have to wait for it to finish.
+ */
+ if (sport->dma_is_enabled && sport->dma_is_txing)
+ return;
+
temp = readl(sport->port.membase + UCR1);
writel(temp & ~UCR1_TXMPTYEN, sport->port.membase + UCR1);
}
@@ -399,6 +436,13 @@ static void imx_stop_rx(struct uart_port *port)
struct imx_port *sport = (struct imx_port *)port;
unsigned long temp;
+ /*
+ * We are maybe in the SMP context, so if the DMA TX thread is running
+ * on other cpu, we have to wait for it to finish.
+ */
+ if (sport->dma_is_enabled && sport->dma_is_rxing)
+ return;
+
temp = readl(sport->port.membase + UCR2);
writel(temp & ~UCR2_RXEN, sport->port.membase + UCR2);
}
@@ -434,6 +478,95 @@ static inline void imx_transmit_buffer(struct imx_port *sport)
imx_stop_tx(&sport->port);
}
+static void dma_tx_callback(void *data)
+{
+ struct imx_port *sport = data;
+ struct scatterlist *sgl = &sport->tx_sgl[0];
+ struct circ_buf *xmit = &sport->port.state->xmit;
+ unsigned long flags;
+
+ dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
+
+ sport->dma_is_txing = 0;
+
+ /* update the stat */
+ spin_lock_irqsave(&sport->port.lock, flags);
+ xmit->tail = (xmit->tail + sport->tx_bytes) & (UART_XMIT_SIZE - 1);
+ sport->port.icount.tx += sport->tx_bytes;
+ spin_unlock_irqrestore(&sport->port.lock, flags);
+
+ dev_dbg(sport->port.dev, "we finish the TX DMA.\n");
+
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(&sport->port);
+
+ if (waitqueue_active(&sport->dma_wait)) {
+ wake_up(&sport->dma_wait);
+ dev_dbg(sport->port.dev, "exit in %s.\n", __func__);
+ return;
+ }
+
+ schedule_work(&sport->tsk_dma_tx);
+}
+
+static void dma_tx_work(struct work_struct *w)
+{
+ struct imx_port *sport = container_of(w, struct imx_port, tsk_dma_tx);
+ struct circ_buf *xmit = &sport->port.state->xmit;
+ struct scatterlist *sgl = sport->tx_sgl;
+ struct dma_async_tx_descriptor *desc;
+ struct dma_chan *chan = sport->dma_chan_tx;
+ struct device *dev = sport->port.dev;
+ enum dma_status status;
+ unsigned long flags;
+ int ret;
+
+ status = chan->device->device_tx_status(chan, (dma_cookie_t)0, NULL);
+ if (DMA_IN_PROGRESS == status)
+ return;
+
+ spin_lock_irqsave(&sport->port.lock, flags);
+ sport->tx_bytes = uart_circ_chars_pending(xmit);
+ if (sport->tx_bytes == 0) {
+ spin_unlock_irqrestore(&sport->port.lock, flags);
+ return;
+ }
+
+ if (xmit->tail > xmit->head) {
+ sport->dma_tx_nents = 2;
+ sg_init_table(sgl, 2);
+ sg_set_buf(sgl, xmit->buf + xmit->tail,
+ UART_XMIT_SIZE - xmit->tail);
+ sg_set_buf(sgl + 1, xmit->buf, xmit->head);
+ } else {
+ sport->dma_tx_nents = 1;
+ sg_init_one(sgl, xmit->buf + xmit->tail, sport->tx_bytes);
+ }
+ spin_unlock_irqrestore(&sport->port.lock, flags);
+
+ ret = dma_map_sg(dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
+ if (ret == 0) {
+ dev_err(dev, "DMA mapping error for TX.\n");
+ return;
+ }
+ desc = dmaengine_prep_slave_sg(chan, sgl, sport->dma_tx_nents,
+ DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
+ if (!desc) {
+ dev_err(dev, "We cannot prepare for the TX slave dma!\n");
+ return;
+ }
+ desc->callback = dma_tx_callback;
+ desc->callback_param = sport;
+
+ dev_dbg(dev, "TX: prepare to send %lu bytes by DMA.\n",
+ uart_circ_chars_pending(xmit));
+ /* fire it */
+ sport->dma_is_txing = 1;
+ dmaengine_submit(desc);
+ dma_async_issue_pending(chan);
+ return;
+}
+
/*
* interrupts disabled on entry
*/
@@ -460,8 +593,10 @@ static void imx_start_tx(struct uart_port *port)
temp |= UCR4_OREN;
writel(temp, sport->port.membase + UCR4);
- temp = readl(sport->port.membase + UCR1);
- writel(temp | UCR1_TXMPTYEN, sport->port.membase + UCR1);
+ if (!sport->dma_is_enabled) {
+ temp = readl(sport->port.membase + UCR1);
+ writel(temp | UCR1_TXMPTYEN, sport->port.membase + UCR1);
+ }
if (USE_IRDA(sport)) {
temp = readl(sport->port.membase + UCR1);
@@ -473,6 +608,15 @@ static void imx_start_tx(struct uart_port *port)
writel(temp, sport->port.membase + UCR4);
}
+ if (sport->dma_is_enabled) {
+ /*
+ * We may in the interrupt context, so arise a work_struct to
+ * do the real job.
+ */
+ schedule_work(&sport->tsk_dma_tx);
+ return;
+ }
+
if (readl(sport->port.membase + uts_reg(sport)) & UTS_TXEMPTY)
imx_transmit_buffer(sport);
}
@@ -588,6 +732,28 @@ out:
return IRQ_HANDLED;
}
+/*
+ * If the RXFIFO is filled with some data, and then we
+ * arise a DMA operation to receive them.
+ */
+static void imx_dma_rxint(struct imx_port *sport)
+{
+ unsigned long temp;
+
+ temp = readl(sport->port.membase + USR2);
+ if ((temp & USR2_RDR) && !sport->dma_is_rxing) {
+ sport->dma_is_rxing = 1;
+
+ /* disable the `Recerver Ready Interrrupt` */
+ temp = readl(sport->port.membase + UCR1);
+ temp &= ~(UCR1_RRDYEN);
+ writel(temp, sport->port.membase + UCR1);
+
+ /* tell the DMA to receive the data. */
+ schedule_work(&sport->tsk_dma_rx);
+ }
+}
+
static irqreturn_t imx_int(int irq, void *dev_id)
{
struct imx_port *sport = dev_id;
@@ -596,8 +762,12 @@ static irqreturn_t imx_int(int irq, void *dev_id)
sts = readl(sport->port.membase + USR1);
- if (sts & USR1_RRDY)
- imx_rxint(irq, dev_id);
+ if (sts & USR1_RRDY) {
+ if (sport->dma_is_enabled)
+ imx_dma_rxint(sport);
+ else
+ imx_rxint(irq, dev_id);
+ }
if (sts & USR1_TRDY &&
readl(sport->port.membase + UCR1) & UCR1_TXMPTYEN)
@@ -654,7 +824,8 @@ static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl)
temp = readl(sport->port.membase + UCR2) & ~UCR2_CTS;
if (mctrl & TIOCM_RTS)
- temp |= UCR2_CTS;
+ if (!sport->dma_is_enabled)
+ temp |= UCR2_CTS;
writel(temp, sport->port.membase + UCR2);
}
@@ -693,6 +864,226 @@ static int imx_setup_ufcr(struct imx_port *sport, unsigned int mode)
return 0;
}
+#define RX_BUF_SIZE (PAGE_SIZE)
+static int start_rx_dma(struct imx_port *sport);
+static void dma_rx_work(struct work_struct *w)
+{
+ struct imx_port *sport = container_of(w, struct imx_port, tsk_dma_rx);
+ struct tty_port *port = &sport->port.state->port;
+
+ if (sport->rx_bytes) {
+ tty_insert_flip_string(port, sport->rx_buf, sport->rx_bytes);
+ tty_flip_buffer_push(port);
+ sport->rx_bytes = 0;
+ }
+
+ if (sport->dma_is_rxing)
+ start_rx_dma(sport);
+}
+
+static void imx_rx_dma_done(struct imx_port *sport)
+{
+ unsigned long temp;
+
+ /* Enable this interrupt when the RXFIFO is empty. */
+ temp = readl(sport->port.membase + UCR1);
+ temp |= UCR1_RRDYEN;
+ writel(temp, sport->port.membase + UCR1);
+
+ sport->dma_is_rxing = 0;
+
+ /* Is the shutdown waiting for us? */
+ if (waitqueue_active(&sport->dma_wait))
+ wake_up(&sport->dma_wait);
+}
+
+/*
+ * There are three kinds of RX DMA interrupts(such as in the MX6Q):
+ * [1] the RX DMA buffer is full.
+ * [2] the Aging timer expires(wait for 8 bytes long)
+ * [3] the Idle Condition Detect(enabled the UCR4_IDDMAEN).
+ *
+ * The [2] is trigger when a character was been sitting in the FIFO
+ * meanwhile [3] can wait for 32 bytes long when the RX line is
+ * on IDLE state and RxFIFO is empty.
+ */
+static void dma_rx_callback(void *data)
+{
+ struct imx_port *sport = data;
+ struct dma_chan *chan = sport->dma_chan_rx;
+ struct scatterlist *sgl = &sport->rx_sgl;
+ struct dma_tx_state state;
+ enum dma_status status;
+ unsigned int count;
+
+ /* unmap it first */
+ dma_unmap_sg(sport->port.dev, sgl, 1, DMA_FROM_DEVICE);
+
+ status = chan->device->device_tx_status(chan, (dma_cookie_t)0, &state);
+ count = RX_BUF_SIZE - state.residue;
+ dev_dbg(sport->port.dev, "We get %d bytes.\n", count);
+
+ if (count) {
+ sport->rx_bytes = count;
+ schedule_work(&sport->tsk_dma_rx);
+ } else
+ imx_rx_dma_done(sport);
+}
+
+static int start_rx_dma(struct imx_port *sport)
+{
+ struct scatterlist *sgl = &sport->rx_sgl;
+ struct dma_chan *chan = sport->dma_chan_rx;
+ struct device *dev = sport->port.dev;
+ struct dma_async_tx_descriptor *desc;
+ int ret;
+
+ sg_init_one(sgl, sport->rx_buf, RX_BUF_SIZE);
+ ret = dma_map_sg(dev, sgl, 1, DMA_FROM_DEVICE);
+ if (ret == 0) {
+ dev_err(dev, "DMA mapping error for RX.\n");
+ return -EINVAL;
+ }
+ desc = dmaengine_prep_slave_sg(chan, sgl, 1, DMA_DEV_TO_MEM,
+ DMA_PREP_INTERRUPT);
+ if (!desc) {
+ dev_err(dev, "We cannot prepare for the RX slave dma!\n");
+ return -EINVAL;
+ }
+ desc->callback = dma_rx_callback;
+ desc->callback_param = sport;
+
+ dev_dbg(dev, "RX: prepare for the DMA.\n");
+ dmaengine_submit(desc);
+ dma_async_issue_pending(chan);
+ return 0;
+}
+
+static void imx_uart_dma_exit(struct imx_port *sport)
+{
+ if (sport->dma_chan_rx) {
+ dma_release_channel(sport->dma_chan_rx);
+ sport->dma_chan_rx = NULL;
+
+ kfree(sport->rx_buf);
+ sport->rx_buf = NULL;
+ }
+
+ if (sport->dma_chan_tx) {
+ dma_release_channel(sport->dma_chan_tx);
+ sport->dma_chan_tx = NULL;
+ }
+
+ sport->dma_is_inited = 0;
+}
+
+static int imx_uart_dma_init(struct imx_port *sport)
+{
+ struct dma_slave_config slave_config = {};
+ struct device *dev = sport->port.dev;
+ int ret;
+
+ /* Prepare for RX : */
+ sport->dma_chan_rx = dma_request_slave_channel(dev, "rx");
+ if (!sport->dma_chan_rx) {
+ dev_dbg(dev, "cannot get the DMA channel.\n");
+ ret = -EINVAL;
+ goto err;
+ }
+
+ slave_config.direction = DMA_DEV_TO_MEM;
+ slave_config.src_addr = sport->port.mapbase + URXD0;
+ slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+ slave_config.src_maxburst = RXTL;
+ ret = dmaengine_slave_config(sport->dma_chan_rx, &slave_config);
+ if (ret) {
+ dev_err(dev, "error in RX dma configuration.\n");
+ goto err;
+ }
+
+ sport->rx_buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!sport->rx_buf) {
+ dev_err(dev, "cannot alloc DMA buffer.\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+ sport->rx_bytes = 0;
+
+ /* Prepare for TX : */
+ sport->dma_chan_tx = dma_request_slave_channel(dev, "tx");
+ if (!sport->dma_chan_tx) {
+ dev_err(dev, "cannot get the TX DMA channel!\n");
+ ret = -EINVAL;
+ goto err;
+ }
+
+ slave_config.direction = DMA_MEM_TO_DEV;
+ slave_config.dst_addr = sport->port.mapbase + URTX0;
+ slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+ slave_config.dst_maxburst = TXTL;
+ ret = dmaengine_slave_config(sport->dma_chan_tx, &slave_config);
+ if (ret) {
+ dev_err(dev, "error in TX dma configuration.");
+ goto err;
+ }
+
+ sport->dma_is_inited = 1;
+
+ return 0;
+err:
+ imx_uart_dma_exit(sport);
+ return ret;
+}
+
+static void imx_enable_dma(struct imx_port *sport)
+{
+ unsigned long temp;
+ struct tty_port *port = &sport->port.state->port;
+
+ port->low_latency = 1;
+ INIT_WORK(&sport->tsk_dma_tx, dma_tx_work);
+ INIT_WORK(&sport->tsk_dma_rx, dma_rx_work);
+ init_waitqueue_head(&sport->dma_wait);
+
+ /* set UCR1 */
+ temp = readl(sport->port.membase + UCR1);
+ temp |= UCR1_RDMAEN | UCR1_TDMAEN | UCR1_ATDMAEN |
+ /* wait for 32 idle frames for IDDMA interrupt */
+ UCR1_ICD_REG(3);
+ writel(temp, sport->port.membase + UCR1);
+
+ /* set UCR4 */
+ temp = readl(sport->port.membase + UCR4);
+ temp |= UCR4_IDDMAEN;
+ writel(temp, sport->port.membase + UCR4);
+
+ sport->dma_is_enabled = 1;
+}
+
+static void imx_disable_dma(struct imx_port *sport)
+{
+ unsigned long temp;
+ struct tty_port *port = &sport->port.state->port;
+
+ /* clear UCR1 */
+ temp = readl(sport->port.membase + UCR1);
+ temp &= ~(UCR1_RDMAEN | UCR1_TDMAEN | UCR1_ATDMAEN);
+ writel(temp, sport->port.membase + UCR1);
+
+ /* clear UCR2 */
+ temp = readl(sport->port.membase + UCR2);
+ temp &= ~(UCR2_CTSC | UCR2_CTS);
+ writel(temp, sport->port.membase + UCR2);
+
+ /* clear UCR4 */
+ temp = readl(sport->port.membase + UCR4);
+ temp &= ~UCR4_IDDMAEN;
+ writel(temp, sport->port.membase + UCR4);
+
+ sport->dma_is_enabled = 0;
+ port->low_latency = 0;
+}
+
/* half the RX buffer size */
#define CTSTL 16
@@ -702,15 +1093,13 @@ static int imx_startup(struct uart_port *port)
int retval;
unsigned long flags, temp;
- if (!uart_console(port)) {
- retval = clk_prepare_enable(sport->clk_per);
- if (retval)
- goto error_out1;
- retval = clk_prepare_enable(sport->clk_ipg);
- if (retval) {
- clk_disable_unprepare(sport->clk_per);
- goto error_out1;
- }
+ retval = clk_prepare_enable(sport->clk_per);
+ if (retval)
+ goto error_out1;
+ retval = clk_prepare_enable(sport->clk_ipg);
+ if (retval) {
+ clk_disable_unprepare(sport->clk_per);
+ goto error_out1;
}
imx_setup_ufcr(sport, 0);
@@ -803,7 +1192,7 @@ static int imx_startup(struct uart_port *port)
}
}
- if (is_imx21_uart(sport)) {
+ if (!is_imx1_uart(sport)) {
temp = readl(sport->port.membase + UCR3);
temp |= IMX21_UCR3_RXDMUXSEL;
writel(temp, sport->port.membase + UCR3);
@@ -833,7 +1222,7 @@ static int imx_startup(struct uart_port *port)
if (USE_IRDA(sport)) {
struct imxuart_platform_data *pdata;
- pdata = sport->port.dev->platform_data;
+ pdata = dev_get_platdata(sport->port.dev);
sport->irda_inv_rx = pdata->irda_inv_rx;
sport->irda_inv_tx = pdata->irda_inv_tx;
sport->trcv_delay = pdata->transceiver_delay;
@@ -859,6 +1248,15 @@ static void imx_shutdown(struct uart_port *port)
unsigned long temp;
unsigned long flags;
+ if (sport->dma_is_enabled) {
+ /* We have to wait for the DMA to finish. */
+ wait_event(sport->dma_wait,
+ !sport->dma_is_rxing && !sport->dma_is_txing);
+ imx_stop_rx(port);
+ imx_disable_dma(sport);
+ imx_uart_dma_exit(sport);
+ }
+
spin_lock_irqsave(&sport->port.lock, flags);
temp = readl(sport->port.membase + UCR2);
temp &= ~(UCR2_TXEN);
@@ -867,7 +1265,7 @@ static void imx_shutdown(struct uart_port *port)
if (USE_IRDA(sport)) {
struct imxuart_platform_data *pdata;
- pdata = sport->port.dev->platform_data;
+ pdata = dev_get_platdata(sport->port.dev);
if (pdata->irda_enable)
pdata->irda_enable(0);
}
@@ -901,10 +1299,8 @@ static void imx_shutdown(struct uart_port *port)
writel(temp, sport->port.membase + UCR1);
spin_unlock_irqrestore(&sport->port.lock, flags);
- if (!uart_console(&sport->port)) {
- clk_disable_unprepare(sport->clk_per);
- clk_disable_unprepare(sport->clk_ipg);
- }
+ clk_disable_unprepare(sport->clk_per);
+ clk_disable_unprepare(sport->clk_ipg);
}
static void
@@ -947,6 +1343,11 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
if (sport->have_rtscts) {
ucr2 &= ~UCR2_IRTS;
ucr2 |= UCR2_CTSC;
+
+ /* Can we enable the DMA support? */
+ if (is_imx6q_uart(sport) && !uart_console(port)
+ && !sport->dma_is_inited)
+ imx_uart_dma_init(sport);
} else {
termios->c_cflag &= ~CRTSCTS;
}
@@ -1020,6 +1421,11 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
*/
div = 1;
} else {
+ /* custom-baudrate handling */
+ div = sport->port.uartclk / (baud * 16);
+ if (baud == 38400 && quot != div)
+ baud = sport->port.uartclk / (quot * 16);
+
div = sport->port.uartclk / (baud * 16);
if (div > 7)
div = 7;
@@ -1048,7 +1454,7 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
writel(num, sport->port.membase + UBIR);
writel(denom, sport->port.membase + UBMR);
- if (is_imx21_uart(sport))
+ if (!is_imx1_uart(sport))
writel(sport->port.uartclk / div / 1000,
sport->port.membase + IMX21_ONEMS);
@@ -1060,6 +1466,8 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
imx_enable_ms(&sport->port);
+ if (sport->dma_is_inited && !sport->dma_is_enabled)
+ imx_enable_dma(sport);
spin_unlock_irqrestore(&sport->port.lock, flags);
}
@@ -1251,6 +1659,16 @@ imx_console_write(struct console *co, const char *s, unsigned int count)
unsigned int ucr1;
unsigned long flags = 0;
int locked = 1;
+ int retval;
+
+ retval = clk_enable(sport->clk_per);
+ if (retval)
+ return;
+ retval = clk_enable(sport->clk_ipg);
+ if (retval) {
+ clk_disable(sport->clk_per);
+ return;
+ }
if (sport->port.sysrq)
locked = 0;
@@ -1286,6 +1704,9 @@ imx_console_write(struct console *co, const char *s, unsigned int count)
if (locked)
spin_unlock_irqrestore(&sport->port.lock, flags);
+
+ clk_disable(sport->clk_ipg);
+ clk_disable(sport->clk_per);
}
/*
@@ -1359,6 +1780,7 @@ imx_console_setup(struct console *co, char *options)
int bits = 8;
int parity = 'n';
int flow = 'n';
+ int retval;
/*
* Check whether an invalid uart number has been specified, and
@@ -1371,6 +1793,11 @@ imx_console_setup(struct console *co, char *options)
if (sport == NULL)
return -ENODEV;
+ /* For setting the registers, we only need to enable the ipg clock. */
+ retval = clk_prepare_enable(sport->clk_ipg);
+ if (retval)
+ goto error_console;
+
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
else
@@ -1378,7 +1805,20 @@ imx_console_setup(struct console *co, char *options)
imx_setup_ufcr(sport, 0);
- return uart_set_options(&sport->port, co, baud, parity, bits, flow);
+ retval = uart_set_options(&sport->port, co, baud, parity, bits, flow);
+
+ clk_disable(sport->clk_ipg);
+ if (retval) {
+ clk_unprepare(sport->clk_ipg);
+ goto error_console;
+ }
+
+ retval = clk_prepare(sport->clk_per);
+ if (retval)
+ clk_disable_unprepare(sport->clk_ipg);
+
+error_console:
+ return retval;
}
static struct uart_driver imx_reg;
@@ -1472,6 +1912,9 @@ static int serial_imx_probe_dt(struct imx_port *sport,
sport->devdata = of_id->data;
+ if (of_device_is_stdout_path(np))
+ add_preferred_console(imx_reg.cons->name, sport->port.line, 0);
+
return 0;
}
#else
@@ -1485,7 +1928,7 @@ static inline int serial_imx_probe_dt(struct imx_port *sport,
static void serial_imx_probe_pdata(struct imx_port *sport,
struct platform_device *pdev)
{
- struct imxuart_platform_data *pdata = pdev->dev.platform_data;
+ struct imxuart_platform_data *pdata = dev_get_platdata(&pdev->dev);
sport->port.line = pdev->id;
sport->devdata = (struct imx_uart_data *) pdev->id_entry->driver_data;
@@ -1507,7 +1950,6 @@ static int serial_imx_probe(struct platform_device *pdev)
void __iomem *base;
int ret = 0;
struct resource *res;
- struct pinctrl *pinctrl;
sport = devm_kzalloc(&pdev->dev, sizeof(*sport), GFP_KERNEL);
if (!sport)
@@ -1543,13 +1985,6 @@ static int serial_imx_probe(struct platform_device *pdev)
sport->timer.function = imx_timeout;
sport->timer.data = (unsigned long)sport;
- pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
- if (IS_ERR(pinctrl)) {
- ret = PTR_ERR(pinctrl);
- dev_err(&pdev->dev, "failed to get default pinctrl: %d\n", ret);
- return ret;
- }
-
sport->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
if (IS_ERR(sport->clk_ipg)) {
ret = PTR_ERR(sport->clk_ipg);
@@ -1564,18 +1999,15 @@ static int serial_imx_probe(struct platform_device *pdev)
return ret;
}
- clk_prepare_enable(sport->clk_per);
- clk_prepare_enable(sport->clk_ipg);
-
sport->port.uartclk = clk_get_rate(sport->clk_per);
imx_ports[sport->port.line] = sport;
- pdata = pdev->dev.platform_data;
+ pdata = dev_get_platdata(&pdev->dev);
if (pdata && pdata->init) {
ret = pdata->init(pdev);
if (ret)
- goto clkput;
+ return ret;
}
ret = uart_add_one_port(&imx_reg, &sport->port);
@@ -1583,18 +2015,10 @@ static int serial_imx_probe(struct platform_device *pdev)
goto deinit;
platform_set_drvdata(pdev, sport);
- if (!uart_console(&sport->port)) {
- clk_disable_unprepare(sport->clk_per);
- clk_disable_unprepare(sport->clk_ipg);
- }
-
return 0;
deinit:
if (pdata && pdata->exit)
pdata->exit(pdev);
-clkput:
- clk_disable_unprepare(sport->clk_per);
- clk_disable_unprepare(sport->clk_ipg);
return ret;
}
@@ -1603,9 +2027,7 @@ static int serial_imx_remove(struct platform_device *pdev)
struct imxuart_platform_data *pdata;
struct imx_port *sport = platform_get_drvdata(pdev);
- pdata = pdev->dev.platform_data;
-
- platform_set_drvdata(pdev, NULL);
+ pdata = dev_get_platdata(&pdev->dev);
uart_remove_one_port(&imx_reg, &sport->port);
diff --git a/drivers/tty/serial/ioc4_serial.c b/drivers/tty/serial/ioc4_serial.c
index e2520ab..1274499 100644
--- a/drivers/tty/serial/ioc4_serial.c
+++ b/drivers/tty/serial/ioc4_serial.c
@@ -297,7 +297,7 @@ struct ioc4_serial {
struct ioc4_uartregs uart_1;
struct ioc4_uartregs uart_2;
struct ioc4_uartregs uart_3;
-} ioc4_serial;
+};
/* UART clock speed */
#define IOC4_SER_XIN_CLK_66 66666667
@@ -2767,7 +2767,7 @@ ioc4_serial_core_attach(struct pci_dev *pdev, int port_type)
* called per card found from IOC4 master module.
* @idd: Master module data for this IOC4
*/
-int
+static int
ioc4_serial_attach_one(struct ioc4_driver_data *idd)
{
unsigned long tmp_addr1;
diff --git a/drivers/tty/serial/lantiq.c b/drivers/tty/serial/lantiq.c
index 15733da..88d01e0 100644
--- a/drivers/tty/serial/lantiq.c
+++ b/drivers/tty/serial/lantiq.c
@@ -318,7 +318,7 @@ lqasc_startup(struct uart_port *port)
struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
int retval;
- if (ltq_port->clk)
+ if (!IS_ERR(ltq_port->clk))
clk_enable(ltq_port->clk);
port->uartclk = clk_get_rate(ltq_port->fpiclk);
@@ -386,7 +386,7 @@ lqasc_shutdown(struct uart_port *port)
port->membase + LTQ_ASC_RXFCON);
ltq_w32_mask(ASCTXFCON_TXFEN, ASCTXFCON_TXFFLU,
port->membase + LTQ_ASC_TXFCON);
- if (ltq_port->clk)
+ if (!IS_ERR(ltq_port->clk))
clk_disable(ltq_port->clk);
}
@@ -636,6 +636,9 @@ lqasc_console_setup(struct console *co, char *options)
port = &ltq_port->port;
+ if (!IS_ERR(ltq_port->clk))
+ clk_enable(ltq_port->clk);
+
port->uartclk = clk_get_rate(ltq_port->fpiclk);
if (options)
diff --git a/drivers/tty/serial/lpc32xx_hs.c b/drivers/tty/serial/lpc32xx_hs.c
index dffea6b..701644f 100644
--- a/drivers/tty/serial/lpc32xx_hs.c
+++ b/drivers/tty/serial/lpc32xx_hs.c
@@ -279,7 +279,10 @@ static void __serial_lpc32xx_rx(struct uart_port *port)
tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
}
+
+ spin_unlock(&port->lock);
tty_flip_buffer_push(tport);
+ spin_lock(&port->lock);
}
static void __serial_lpc32xx_tx(struct uart_port *port)
@@ -351,10 +354,8 @@ static irqreturn_t serial_lpc32xx_interrupt(int irq, void *dev_id)
}
/* Data received? */
- if (status & (LPC32XX_HSU_RX_TIMEOUT_INT | LPC32XX_HSU_RX_TRIG_INT)) {
+ if (status & (LPC32XX_HSU_RX_TIMEOUT_INT | LPC32XX_HSU_RX_TRIG_INT))
__serial_lpc32xx_rx(port);
- tty_flip_buffer_push(tport);
- }
/* Transmit data request? */
if ((status & LPC32XX_HSU_TX_INT) && (!uart_tx_stopped(port))) {
diff --git a/drivers/tty/serial/m32r_sio.c b/drivers/tty/serial/m32r_sio.c
index bb1afa0..9cd9b4e 100644
--- a/drivers/tty/serial/m32r_sio.c
+++ b/drivers/tty/serial/m32r_sio.c
@@ -368,7 +368,10 @@ static void receive_chars(struct uart_sio_port *up, int *status)
ignore_char:
*status = serial_in(up, UART_LSR);
} while ((*status & UART_LSR_DR) && (max_count-- > 0));
+
+ spin_unlock(&up->port.lock);
tty_flip_buffer_push(port);
+ spin_lock(&up->port.lock);
}
static void transmit_chars(struct uart_sio_port *up)
diff --git a/drivers/tty/serial/max3100.c b/drivers/tty/serial/max3100.c
index 35866d5..79f9a9e 100644
--- a/drivers/tty/serial/max3100.c
+++ b/drivers/tty/serial/max3100.c
@@ -779,7 +779,7 @@ static int max3100_probe(struct spi_device *spi)
max3100s[i]->irq = spi->irq;
spin_lock_init(&max3100s[i]->conf_lock);
spi_set_drvdata(spi, max3100s[i]);
- pdata = spi->dev.platform_data;
+ pdata = dev_get_platdata(&spi->dev);
max3100s[i]->crystal = pdata->crystal;
max3100s[i]->loopback = pdata->loopback;
max3100s[i]->poll_time = pdata->poll_time * HZ / 1000;
diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index 8941e64..b2e707aa 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -1,7 +1,7 @@
/*
- * Maxim (Dallas) MAX3107/8 serial driver
+ * Maxim (Dallas) MAX3107/8/9, MAX14830 serial driver
*
- * Copyright (C) 2012 Alexander Shiyan <shc_work@mail.ru>
+ * Copyright (C) 2012-2013 Alexander Shiyan <shc_work@mail.ru>
*
* Based on max3100.c, by Christian Pellegrin <chripell@evolware.org>
* Based on max3110.c, by Feng Tang <feng.tang@intel.com>
@@ -13,11 +13,10 @@
* (at your option) any later version.
*/
-/* TODO: MAX3109 support (Dual) */
-/* TODO: MAX14830 support (Quad) */
-
#include <linux/module.h>
+#include <linux/delay.h>
#include <linux/device.h>
+#include <linux/bitops.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
#include <linux/tty.h>
@@ -25,8 +24,10 @@
#include <linux/regmap.h>
#include <linux/gpio.h>
#include <linux/spi/spi.h>
+
#include <linux/platform_data/max310x.h>
+#define MAX310X_NAME "max310x"
#define MAX310X_MAJOR 204
#define MAX310X_MINOR 209
@@ -37,7 +38,8 @@
#define MAX310X_IRQSTS_REG (0x02) /* IRQ status */
#define MAX310X_LSR_IRQEN_REG (0x03) /* LSR IRQ enable */
#define MAX310X_LSR_IRQSTS_REG (0x04) /* LSR IRQ status */
-#define MAX310X_SPCHR_IRQEN_REG (0x05) /* Special char IRQ enable */
+#define MAX310X_REG_05 (0x05)
+#define MAX310X_SPCHR_IRQEN_REG MAX310X_REG_05 /* Special char IRQ en */
#define MAX310X_SPCHR_IRQSTS_REG (0x06) /* Special char IRQ status */
#define MAX310X_STS_IRQEN_REG (0x07) /* Status IRQ enable */
#define MAX310X_STS_IRQSTS_REG (0x08) /* Status IRQ status */
@@ -63,8 +65,15 @@
#define MAX310X_BRGDIVLSB_REG (0x1c) /* Baud rate divisor LSB */
#define MAX310X_BRGDIVMSB_REG (0x1d) /* Baud rate divisor MSB */
#define MAX310X_CLKSRC_REG (0x1e) /* Clock source */
-/* Only present in MAX3107 */
-#define MAX3107_REVID_REG (0x1f) /* Revision identification */
+#define MAX310X_REG_1F (0x1f)
+
+#define MAX310X_REVID_REG MAX310X_REG_1F /* Revision ID */
+
+#define MAX310X_GLOBALIRQ_REG MAX310X_REG_1F /* Global IRQ (RO) */
+#define MAX310X_GLOBALCMD_REG MAX310X_REG_1F /* Global Command (WO) */
+
+/* Extended registers */
+#define MAX310X_REVID_EXTREG MAX310X_REG_05 /* Revision ID */
/* IRQ register bits */
#define MAX310X_IRQ_LSR_BIT (1 << 0) /* LSR interrupt */
@@ -246,58 +255,210 @@
#define MAX310X_CLKSRC_EXTCLK_BIT (1 << 4) /* External clock enable */
#define MAX310X_CLKSRC_CLK2RTS_BIT (1 << 7) /* Baud clk to RTS pin */
+/* Global commands */
+#define MAX310X_EXTREG_ENBL (0xce)
+#define MAX310X_EXTREG_DSBL (0xcd)
+
/* Misc definitions */
#define MAX310X_FIFO_SIZE (128)
+#define MAX310x_REV_MASK (0xfc)
/* MAX3107 specific */
#define MAX3107_REV_ID (0xa0)
-#define MAX3107_REV_MASK (0xfe)
-
-/* IRQ status bits definitions */
-#define MAX310X_IRQ_TX (MAX310X_IRQ_TXFIFO_BIT | \
- MAX310X_IRQ_TXEMPTY_BIT)
-#define MAX310X_IRQ_RX (MAX310X_IRQ_RXFIFO_BIT | \
- MAX310X_IRQ_RXEMPTY_BIT)
-
-/* Supported chip types */
-enum {
- MAX310X_TYPE_MAX3107 = 3107,
- MAX310X_TYPE_MAX3108 = 3108,
+
+/* MAX3109 specific */
+#define MAX3109_REV_ID (0xc0)
+
+/* MAX14830 specific */
+#define MAX14830_BRGCFG_CLKDIS_BIT (1 << 6) /* Clock Disable */
+#define MAX14830_REV_ID (0xb0)
+
+struct max310x_devtype {
+ char name[9];
+ int nr;
+ int (*detect)(struct device *);
+ void (*power)(struct uart_port *, int);
};
-struct max310x_port {
- struct uart_driver uart;
+struct max310x_one {
struct uart_port port;
+ struct work_struct tx_work;
+};
- const char *name;
- int uartclk;
-
- unsigned int nr_gpio;
+struct max310x_port {
+ struct uart_driver uart;
+ struct max310x_devtype *devtype;
+ struct regmap *regmap;
+ struct regmap_config regcfg;
+ struct mutex mutex;
+ struct max310x_pdata *pdata;
+ int gpio_used;
#ifdef CONFIG_GPIOLIB
struct gpio_chip gpio;
#endif
+ struct max310x_one p[0];
+};
- struct regmap *regmap;
- struct regmap_config regcfg;
+static u8 max310x_port_read(struct uart_port *port, u8 reg)
+{
+ struct max310x_port *s = dev_get_drvdata(port->dev);
+ unsigned int val = 0;
- struct workqueue_struct *wq;
- struct work_struct tx_work;
+ regmap_read(s->regmap, port->iobase + reg, &val);
- struct mutex max310x_mutex;
+ return val;
+}
- struct max310x_pdata *pdata;
+static void max310x_port_write(struct uart_port *port, u8 reg, u8 val)
+{
+ struct max310x_port *s = dev_get_drvdata(port->dev);
+
+ regmap_write(s->regmap, port->iobase + reg, val);
+}
+
+static void max310x_port_update(struct uart_port *port, u8 reg, u8 mask, u8 val)
+{
+ struct max310x_port *s = dev_get_drvdata(port->dev);
+
+ regmap_update_bits(s->regmap, port->iobase + reg, mask, val);
+}
+
+static int max3107_detect(struct device *dev)
+{
+ struct max310x_port *s = dev_get_drvdata(dev);
+ unsigned int val = 0;
+ int ret;
+
+ ret = regmap_read(s->regmap, MAX310X_REVID_REG, &val);
+ if (ret)
+ return ret;
+
+ if (((val & MAX310x_REV_MASK) != MAX3107_REV_ID)) {
+ dev_err(dev,
+ "%s ID 0x%02x does not match\n", s->devtype->name, val);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int max3108_detect(struct device *dev)
+{
+ struct max310x_port *s = dev_get_drvdata(dev);
+ unsigned int val = 0;
+ int ret;
+
+ /* MAX3108 have not REV ID register, we just check default value
+ * from clocksource register to make sure everything works.
+ */
+ ret = regmap_read(s->regmap, MAX310X_CLKSRC_REG, &val);
+ if (ret)
+ return ret;
+
+ if (val != (MAX310X_CLKSRC_EXTCLK_BIT | MAX310X_CLKSRC_PLLBYP_BIT)) {
+ dev_err(dev, "%s not present\n", s->devtype->name);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int max3109_detect(struct device *dev)
+{
+ struct max310x_port *s = dev_get_drvdata(dev);
+ unsigned int val = 0;
+ int ret;
+
+ ret = regmap_read(s->regmap, MAX310X_REVID_REG, &val);
+ if (ret)
+ return ret;
+
+ if (((val & MAX310x_REV_MASK) != MAX3109_REV_ID)) {
+ dev_err(dev,
+ "%s ID 0x%02x does not match\n", s->devtype->name, val);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static void max310x_power(struct uart_port *port, int on)
+{
+ max310x_port_update(port, MAX310X_MODE1_REG,
+ MAX310X_MODE1_FORCESLEEP_BIT,
+ on ? 0 : MAX310X_MODE1_FORCESLEEP_BIT);
+ if (on)
+ msleep(50);
+}
+
+static int max14830_detect(struct device *dev)
+{
+ struct max310x_port *s = dev_get_drvdata(dev);
+ unsigned int val = 0;
+ int ret;
+
+ ret = regmap_write(s->regmap, MAX310X_GLOBALCMD_REG,
+ MAX310X_EXTREG_ENBL);
+ if (ret)
+ return ret;
+
+ regmap_read(s->regmap, MAX310X_REVID_EXTREG, &val);
+ regmap_write(s->regmap, MAX310X_GLOBALCMD_REG, MAX310X_EXTREG_DSBL);
+ if (((val & MAX310x_REV_MASK) != MAX14830_REV_ID)) {
+ dev_err(dev,
+ "%s ID 0x%02x does not match\n", s->devtype->name, val);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static void max14830_power(struct uart_port *port, int on)
+{
+ max310x_port_update(port, MAX310X_BRGCFG_REG,
+ MAX14830_BRGCFG_CLKDIS_BIT,
+ on ? 0 : MAX14830_BRGCFG_CLKDIS_BIT);
+ if (on)
+ msleep(50);
+}
+
+static const struct max310x_devtype max3107_devtype = {
+ .name = "MAX3107",
+ .nr = 1,
+ .detect = max3107_detect,
+ .power = max310x_power,
+};
+
+static const struct max310x_devtype max3108_devtype = {
+ .name = "MAX3108",
+ .nr = 1,
+ .detect = max3108_detect,
+ .power = max310x_power,
+};
+
+static const struct max310x_devtype max3109_devtype = {
+ .name = "MAX3109",
+ .nr = 2,
+ .detect = max3109_detect,
+ .power = max310x_power,
+};
+
+static const struct max310x_devtype max14830_devtype = {
+ .name = "MAX14830",
+ .nr = 4,
+ .detect = max14830_detect,
+ .power = max14830_power,
};
-static bool max3107_8_reg_writeable(struct device *dev, unsigned int reg)
+static bool max310x_reg_writeable(struct device *dev, unsigned int reg)
{
- switch (reg) {
+ switch (reg & 0x1f) {
case MAX310X_IRQSTS_REG:
case MAX310X_LSR_IRQSTS_REG:
case MAX310X_SPCHR_IRQSTS_REG:
case MAX310X_STS_IRQSTS_REG:
case MAX310X_TXFIFOLVL_REG:
case MAX310X_RXFIFOLVL_REG:
- case MAX3107_REVID_REG: /* Only available on MAX3107 */
return false;
default:
break;
@@ -308,7 +469,7 @@ static bool max3107_8_reg_writeable(struct device *dev, unsigned int reg)
static bool max310x_reg_volatile(struct device *dev, unsigned int reg)
{
- switch (reg) {
+ switch (reg & 0x1f) {
case MAX310X_RHR_REG:
case MAX310X_IRQSTS_REG:
case MAX310X_LSR_IRQSTS_REG:
@@ -317,6 +478,9 @@ static bool max310x_reg_volatile(struct device *dev, unsigned int reg)
case MAX310X_TXFIFOLVL_REG:
case MAX310X_RXFIFOLVL_REG:
case MAX310X_GPIODATA_REG:
+ case MAX310X_BRGDIVLSB_REG:
+ case MAX310X_REG_05:
+ case MAX310X_REG_1F:
return true;
default:
break;
@@ -327,7 +491,7 @@ static bool max310x_reg_volatile(struct device *dev, unsigned int reg)
static bool max310x_reg_precious(struct device *dev, unsigned int reg)
{
- switch (reg) {
+ switch (reg & 0x1f) {
case MAX310X_RHR_REG:
case MAX310X_IRQSTS_REG:
case MAX310X_SPCHR_IRQSTS_REG:
@@ -340,42 +504,25 @@ static bool max310x_reg_precious(struct device *dev, unsigned int reg)
return false;
}
-static void max310x_set_baud(struct max310x_port *s, int baud)
+static void max310x_set_baud(struct uart_port *port, int baud)
{
- unsigned int mode = 0, div = s->uartclk / baud;
+ unsigned int mode = 0, div = port->uartclk / baud;
if (!(div / 16)) {
/* Mode x2 */
mode = MAX310X_BRGCFG_2XMODE_BIT;
- div = (s->uartclk * 2) / baud;
+ div = (port->uartclk * 2) / baud;
}
if (!(div / 16)) {
/* Mode x4 */
mode = MAX310X_BRGCFG_4XMODE_BIT;
- div = (s->uartclk * 4) / baud;
+ div = (port->uartclk * 4) / baud;
}
- regmap_write(s->regmap, MAX310X_BRGDIVMSB_REG,
- ((div / 16) >> 8) & 0xff);
- regmap_write(s->regmap, MAX310X_BRGDIVLSB_REG, (div / 16) & 0xff);
- regmap_write(s->regmap, MAX310X_BRGCFG_REG, (div % 16) | mode);
-}
-
-static void max310x_wait_pll(struct max310x_port *s)
-{
- int tryes = 1000;
-
- /* Wait for PLL only if crystal is used */
- if (!(s->pdata->driver_flags & MAX310X_EXT_CLK)) {
- unsigned int sts = 0;
-
- while (tryes--) {
- regmap_read(s->regmap, MAX310X_STS_IRQSTS_REG, &sts);
- if (sts & MAX310X_STS_CLKREADY_BIT)
- break;
- }
- }
+ max310x_port_write(port, MAX310X_BRGDIVMSB_REG, (div / 16) >> 8);
+ max310x_port_write(port, MAX310X_BRGDIVLSB_REG, div / 16);
+ max310x_port_write(port, MAX310X_BRGCFG_REG, (div % 16) | mode);
}
static int max310x_update_best_err(unsigned long f, long *besterr)
@@ -449,49 +596,49 @@ static int max310x_set_ref_clk(struct max310x_port *s)
regmap_write(s->regmap, MAX310X_CLKSRC_REG, clksrc);
- if (pllcfg)
- max310x_wait_pll(s);
-
- dev_dbg(s->port.dev, "Reference clock set to %lu Hz\n", bestfreq);
+ /* Wait for crystal */
+ if (pllcfg && !(s->pdata->driver_flags & MAX310X_EXT_CLK))
+ msleep(10);
return (int)bestfreq;
}
-static void max310x_handle_rx(struct max310x_port *s, unsigned int rxlen)
+static void max310x_handle_rx(struct uart_port *port, unsigned int rxlen)
{
- unsigned int sts = 0, ch = 0, flag;
+ unsigned int sts, ch, flag;
- if (unlikely(rxlen >= MAX310X_FIFO_SIZE)) {
- dev_warn(s->port.dev, "Possible RX FIFO overrun %d\n", rxlen);
+ if (unlikely(rxlen >= port->fifosize)) {
+ dev_warn_ratelimited(port->dev,
+ "Port %i: Possible RX FIFO overrun\n",
+ port->line);
+ port->icount.buf_overrun++;
/* Ensure sanity of RX level */
- rxlen = MAX310X_FIFO_SIZE;
+ rxlen = port->fifosize;
}
- dev_dbg(s->port.dev, "RX Len = %u\n", rxlen);
-
while (rxlen--) {
- regmap_read(s->regmap, MAX310X_RHR_REG, &ch);
- regmap_read(s->regmap, MAX310X_LSR_IRQSTS_REG, &sts);
+ ch = max310x_port_read(port, MAX310X_RHR_REG);
+ sts = max310x_port_read(port, MAX310X_LSR_IRQSTS_REG);
sts &= MAX310X_LSR_RXPAR_BIT | MAX310X_LSR_FRERR_BIT |
MAX310X_LSR_RXOVR_BIT | MAX310X_LSR_RXBRK_BIT;
- s->port.icount.rx++;
+ port->icount.rx++;
flag = TTY_NORMAL;
if (unlikely(sts)) {
if (sts & MAX310X_LSR_RXBRK_BIT) {
- s->port.icount.brk++;
- if (uart_handle_break(&s->port))
+ port->icount.brk++;
+ if (uart_handle_break(port))
continue;
} else if (sts & MAX310X_LSR_RXPAR_BIT)
- s->port.icount.parity++;
+ port->icount.parity++;
else if (sts & MAX310X_LSR_FRERR_BIT)
- s->port.icount.frame++;
+ port->icount.frame++;
else if (sts & MAX310X_LSR_RXOVR_BIT)
- s->port.icount.overrun++;
+ port->icount.overrun++;
- sts &= s->port.read_status_mask;
+ sts &= port->read_status_mask;
if (sts & MAX310X_LSR_RXBRK_BIT)
flag = TTY_BREAK;
else if (sts & MAX310X_LSR_RXPAR_BIT)
@@ -502,129 +649,129 @@ static void max310x_handle_rx(struct max310x_port *s, unsigned int rxlen)
flag = TTY_OVERRUN;
}
- if (uart_handle_sysrq_char(s->port, ch))
+ if (uart_handle_sysrq_char(port, ch))
continue;
- if (sts & s->port.ignore_status_mask)
+ if (sts & port->ignore_status_mask)
continue;
- uart_insert_char(&s->port, sts, MAX310X_LSR_RXOVR_BIT,
- ch, flag);
+ uart_insert_char(port, sts, MAX310X_LSR_RXOVR_BIT, ch, flag);
}
- tty_flip_buffer_push(&s->port.state->port);
+ tty_flip_buffer_push(&port->state->port);
}
-static void max310x_handle_tx(struct max310x_port *s)
+static void max310x_handle_tx(struct uart_port *port)
{
- struct circ_buf *xmit = &s->port.state->xmit;
- unsigned int txlen = 0, to_send;
+ struct circ_buf *xmit = &port->state->xmit;
+ unsigned int txlen, to_send;
- if (unlikely(s->port.x_char)) {
- regmap_write(s->regmap, MAX310X_THR_REG, s->port.x_char);
- s->port.icount.tx++;
- s->port.x_char = 0;
+ if (unlikely(port->x_char)) {
+ max310x_port_write(port, MAX310X_THR_REG, port->x_char);
+ port->icount.tx++;
+ port->x_char = 0;
return;
}
- if (uart_circ_empty(xmit) || uart_tx_stopped(&s->port))
+ if (uart_circ_empty(xmit) || uart_tx_stopped(port))
return;
/* Get length of data pending in circular buffer */
to_send = uart_circ_chars_pending(xmit);
if (likely(to_send)) {
/* Limit to size of TX FIFO */
- regmap_read(s->regmap, MAX310X_TXFIFOLVL_REG, &txlen);
- txlen = MAX310X_FIFO_SIZE - txlen;
+ txlen = max310x_port_read(port, MAX310X_TXFIFOLVL_REG);
+ txlen = port->fifosize - txlen;
to_send = (to_send > txlen) ? txlen : to_send;
- dev_dbg(s->port.dev, "TX Len = %u\n", to_send);
-
/* Add data to send */
- s->port.icount.tx += to_send;
+ port->icount.tx += to_send;
while (to_send--) {
- regmap_write(s->regmap, MAX310X_THR_REG,
- xmit->buf[xmit->tail]);
+ max310x_port_write(port, MAX310X_THR_REG,
+ xmit->buf[xmit->tail]);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
};
}
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(&s->port);
+ uart_write_wakeup(port);
}
-static irqreturn_t max310x_ist(int irq, void *dev_id)
+static void max310x_port_irq(struct max310x_port *s, int portno)
{
- struct max310x_port *s = (struct max310x_port *)dev_id;
- unsigned int ists = 0, lsr = 0, rxlen = 0;
+ struct uart_port *port = &s->p[portno].port;
- mutex_lock(&s->max310x_mutex);
+ do {
+ unsigned int ists, lsr, rxlen;
- for (;;) {
/* Read IRQ status & RX FIFO level */
- regmap_read(s->regmap, MAX310X_IRQSTS_REG, &ists);
- regmap_read(s->regmap, MAX310X_LSR_IRQSTS_REG, &lsr);
- regmap_read(s->regmap, MAX310X_RXFIFOLVL_REG, &rxlen);
- if (!ists && !(lsr & MAX310X_LSR_RXTO_BIT) && !rxlen)
+ ists = max310x_port_read(port, MAX310X_IRQSTS_REG);
+ rxlen = max310x_port_read(port, MAX310X_RXFIFOLVL_REG);
+ if (!ists && !rxlen)
break;
- dev_dbg(s->port.dev, "IRQ status: 0x%02x\n", ists);
-
- if (rxlen)
- max310x_handle_rx(s, rxlen);
- if (ists & MAX310X_IRQ_TX)
- max310x_handle_tx(s);
- if (ists & MAX310X_IRQ_CTS_BIT)
- uart_handle_cts_change(&s->port,
+ if (ists & MAX310X_IRQ_CTS_BIT) {
+ lsr = max310x_port_read(port, MAX310X_LSR_IRQSTS_REG);
+ uart_handle_cts_change(port,
!!(lsr & MAX310X_LSR_CTS_BIT));
- }
+ }
+ if (rxlen)
+ max310x_handle_rx(port, rxlen);
+ if (ists & MAX310X_IRQ_TXEMPTY_BIT) {
+ mutex_lock(&s->mutex);
+ max310x_handle_tx(port);
+ mutex_unlock(&s->mutex);
+ }
+ } while (1);
+}
+
+static irqreturn_t max310x_ist(int irq, void *dev_id)
+{
+ struct max310x_port *s = (struct max310x_port *)dev_id;
- mutex_unlock(&s->max310x_mutex);
+ if (s->uart.nr > 1) {
+ do {
+ unsigned int val = ~0;
+
+ WARN_ON_ONCE(regmap_read(s->regmap,
+ MAX310X_GLOBALIRQ_REG, &val));
+ val = ((1 << s->uart.nr) - 1) & ~val;
+ if (!val)
+ break;
+ max310x_port_irq(s, fls(val) - 1);
+ } while (1);
+ } else
+ max310x_port_irq(s, 0);
return IRQ_HANDLED;
}
static void max310x_wq_proc(struct work_struct *ws)
{
- struct max310x_port *s = container_of(ws, struct max310x_port, tx_work);
+ struct max310x_one *one = container_of(ws, struct max310x_one, tx_work);
+ struct max310x_port *s = dev_get_drvdata(one->port.dev);
- mutex_lock(&s->max310x_mutex);
- max310x_handle_tx(s);
- mutex_unlock(&s->max310x_mutex);
+ mutex_lock(&s->mutex);
+ max310x_handle_tx(&one->port);
+ mutex_unlock(&s->mutex);
}
static void max310x_start_tx(struct uart_port *port)
{
- struct max310x_port *s = container_of(port, struct max310x_port, port);
-
- queue_work(s->wq, &s->tx_work);
-}
-
-static void max310x_stop_tx(struct uart_port *port)
-{
- /* Do nothing */
-}
+ struct max310x_one *one = container_of(port, struct max310x_one, port);
-static void max310x_stop_rx(struct uart_port *port)
-{
- /* Do nothing */
+ if (!work_pending(&one->tx_work))
+ schedule_work(&one->tx_work);
}
static unsigned int max310x_tx_empty(struct uart_port *port)
{
- unsigned int val = 0;
- struct max310x_port *s = container_of(port, struct max310x_port, port);
+ unsigned int lvl, sts;
- mutex_lock(&s->max310x_mutex);
- regmap_read(s->regmap, MAX310X_TXFIFOLVL_REG, &val);
- mutex_unlock(&s->max310x_mutex);
+ lvl = max310x_port_read(port, MAX310X_TXFIFOLVL_REG);
+ sts = max310x_port_read(port, MAX310X_IRQSTS_REG);
- return val ? 0 : TIOCSER_TEMT;
-}
-
-static void max310x_enable_ms(struct uart_port *port)
-{
- /* Modem status not supported */
+ return ((sts & MAX310X_IRQ_TXEMPTY_BIT) && !lvl) ? TIOCSER_TEMT : 0;
}
static unsigned int max310x_get_mctrl(struct uart_port *port)
@@ -644,28 +791,20 @@ static void max310x_set_mctrl(struct uart_port *port, unsigned int mctrl)
static void max310x_break_ctl(struct uart_port *port, int break_state)
{
- struct max310x_port *s = container_of(port, struct max310x_port, port);
-
- mutex_lock(&s->max310x_mutex);
- regmap_update_bits(s->regmap, MAX310X_LCR_REG,
- MAX310X_LCR_TXBREAK_BIT,
- break_state ? MAX310X_LCR_TXBREAK_BIT : 0);
- mutex_unlock(&s->max310x_mutex);
+ max310x_port_update(port, MAX310X_LCR_REG,
+ MAX310X_LCR_TXBREAK_BIT,
+ break_state ? MAX310X_LCR_TXBREAK_BIT : 0);
}
static void max310x_set_termios(struct uart_port *port,
struct ktermios *termios,
struct ktermios *old)
{
- struct max310x_port *s = container_of(port, struct max310x_port, port);
unsigned int lcr, flow = 0;
int baud;
- mutex_lock(&s->max310x_mutex);
-
/* Mask termios capabilities we don't support */
termios->c_cflag &= ~CMSPAR;
- termios->c_iflag &= ~IXANY;
/* Word size */
switch (termios->c_cflag & CSIZE) {
@@ -696,7 +835,7 @@ static void max310x_set_termios(struct uart_port *port,
lcr |= MAX310X_LCR_STOPLEN_BIT; /* 2 stops */
/* Update LCR register */
- regmap_write(s->regmap, MAX310X_LCR_REG, lcr);
+ max310x_port_write(port, MAX310X_LCR_REG, lcr);
/* Set read status mask */
port->read_status_mask = MAX310X_LSR_RXOVR_BIT;
@@ -717,8 +856,8 @@ static void max310x_set_termios(struct uart_port *port,
MAX310X_LSR_RXBRK_BIT;
/* Configure flow control */
- regmap_write(s->regmap, MAX310X_XON1_REG, termios->c_cc[VSTART]);
- regmap_write(s->regmap, MAX310X_XOFF1_REG, termios->c_cc[VSTOP]);
+ max310x_port_write(port, MAX310X_XON1_REG, termios->c_cc[VSTART]);
+ max310x_port_write(port, MAX310X_XOFF1_REG, termios->c_cc[VSTOP]);
if (termios->c_cflag & CRTSCTS)
flow |= MAX310X_FLOWCTRL_AUTOCTS_BIT |
MAX310X_FLOWCTRL_AUTORTS_BIT;
@@ -728,7 +867,7 @@ static void max310x_set_termios(struct uart_port *port,
if (termios->c_iflag & IXOFF)
flow |= MAX310X_FLOWCTRL_SWFLOW1_BIT |
MAX310X_FLOWCTRL_SWFLOWEN_BIT;
- regmap_write(s->regmap, MAX310X_FLOWCTRL_REG, flow);
+ max310x_port_write(port, MAX310X_FLOWCTRL_REG, flow);
/* Get baud rate generator configuration */
baud = uart_get_baud_rate(port, termios, old,
@@ -736,36 +875,30 @@ static void max310x_set_termios(struct uart_port *port,
port->uartclk / 4);
/* Setup baudrate generator */
- max310x_set_baud(s, baud);
+ max310x_set_baud(port, baud);
/* Update timeout according to new baud rate */
uart_update_timeout(port, termios->c_cflag, baud);
-
- mutex_unlock(&s->max310x_mutex);
}
static int max310x_startup(struct uart_port *port)
{
unsigned int val, line = port->line;
- struct max310x_port *s = container_of(port, struct max310x_port, port);
-
- if (s->pdata->suspend)
- s->pdata->suspend(0);
+ struct max310x_port *s = dev_get_drvdata(port->dev);
- mutex_lock(&s->max310x_mutex);
+ s->devtype->power(port, 1);
/* Configure baud rate, 9600 as default */
- max310x_set_baud(s, 9600);
+ max310x_set_baud(port, 9600);
/* Configure LCR register, 8N1 mode by default */
- val = MAX310X_LCR_WORD_LEN_8;
- regmap_write(s->regmap, MAX310X_LCR_REG, val);
+ max310x_port_write(port, MAX310X_LCR_REG, MAX310X_LCR_WORD_LEN_8);
/* Configure MODE1 register */
- regmap_update_bits(s->regmap, MAX310X_MODE1_REG,
- MAX310X_MODE1_TRNSCVCTRL_BIT,
- (s->pdata->uart_flags[line] & MAX310X_AUTO_DIR_CTRL)
- ? MAX310X_MODE1_TRNSCVCTRL_BIT : 0);
+ max310x_port_update(port, MAX310X_MODE1_REG,
+ MAX310X_MODE1_TRNSCVCTRL_BIT,
+ (s->pdata->uart_flags[line] & MAX310X_AUTO_DIR_CTRL)
+ ? MAX310X_MODE1_TRNSCVCTRL_BIT : 0);
/* Configure MODE2 register */
val = MAX310X_MODE2_RXEMPTINV_BIT;
@@ -776,63 +909,40 @@ static int max310x_startup(struct uart_port *port)
/* Reset FIFOs */
val |= MAX310X_MODE2_FIFORST_BIT;
- regmap_write(s->regmap, MAX310X_MODE2_REG, val);
-
- /* Configure FIFO trigger level register */
- /* RX FIFO trigger for 16 words, TX FIFO trigger for 64 words */
- val = MAX310X_FIFOTRIGLVL_RX(16) | MAX310X_FIFOTRIGLVL_TX(64);
- regmap_write(s->regmap, MAX310X_FIFOTRIGLVL_REG, val);
+ max310x_port_write(port, MAX310X_MODE2_REG, val);
+ max310x_port_update(port, MAX310X_MODE2_REG,
+ MAX310X_MODE2_FIFORST_BIT, 0);
/* Configure flow control levels */
/* Flow control halt level 96, resume level 48 */
- val = MAX310X_FLOWLVL_RES(48) | MAX310X_FLOWLVL_HALT(96);
- regmap_write(s->regmap, MAX310X_FLOWLVL_REG, val);
-
- /* Clear timeout register */
- regmap_write(s->regmap, MAX310X_RXTO_REG, 0);
+ max310x_port_write(port, MAX310X_FLOWLVL_REG,
+ MAX310X_FLOWLVL_RES(48) | MAX310X_FLOWLVL_HALT(96));
- /* Configure LSR interrupt enable register */
- /* Enable RX timeout interrupt */
- val = MAX310X_LSR_RXTO_BIT;
- regmap_write(s->regmap, MAX310X_LSR_IRQEN_REG, val);
+ /* Clear IRQ status register */
+ max310x_port_read(port, MAX310X_IRQSTS_REG);
- /* Clear FIFO reset */
- regmap_update_bits(s->regmap, MAX310X_MODE2_REG,
- MAX310X_MODE2_FIFORST_BIT, 0);
-
- /* Clear IRQ status register by reading it */
- regmap_read(s->regmap, MAX310X_IRQSTS_REG, &val);
-
- /* Configure interrupt enable register */
- /* Enable CTS change interrupt */
- val = MAX310X_IRQ_CTS_BIT;
- /* Enable RX, TX interrupts */
- val |= MAX310X_IRQ_RX | MAX310X_IRQ_TX;
- regmap_write(s->regmap, MAX310X_IRQEN_REG, val);
-
- mutex_unlock(&s->max310x_mutex);
+ /* Enable RX, TX, CTS change interrupts */
+ val = MAX310X_IRQ_RXEMPTY_BIT | MAX310X_IRQ_TXEMPTY_BIT;
+ max310x_port_write(port, MAX310X_IRQEN_REG, val | MAX310X_IRQ_CTS_BIT);
return 0;
}
static void max310x_shutdown(struct uart_port *port)
{
- struct max310x_port *s = container_of(port, struct max310x_port, port);
+ struct max310x_port *s = dev_get_drvdata(port->dev);
/* Disable all interrupts */
- mutex_lock(&s->max310x_mutex);
- regmap_write(s->regmap, MAX310X_IRQEN_REG, 0);
- mutex_unlock(&s->max310x_mutex);
+ max310x_port_write(port, MAX310X_IRQEN_REG, 0);
- if (s->pdata->suspend)
- s->pdata->suspend(1);
+ s->devtype->power(port, 0);
}
static const char *max310x_type(struct uart_port *port)
{
- struct max310x_port *s = container_of(port, struct max310x_port, port);
+ struct max310x_port *s = dev_get_drvdata(port->dev);
- return (port->type == PORT_MAX310X) ? s->name : NULL;
+ return (port->type == PORT_MAX310X) ? s->devtype->name : NULL;
}
static int max310x_request_port(struct uart_port *port)
@@ -841,134 +951,99 @@ static int max310x_request_port(struct uart_port *port)
return 0;
}
-static void max310x_release_port(struct uart_port *port)
-{
- /* Do nothing */
-}
-
static void max310x_config_port(struct uart_port *port, int flags)
{
if (flags & UART_CONFIG_TYPE)
port->type = PORT_MAX310X;
}
-static int max310x_verify_port(struct uart_port *port, struct serial_struct *ser)
+static int max310x_verify_port(struct uart_port *port, struct serial_struct *s)
{
- if ((ser->type == PORT_UNKNOWN) || (ser->type == PORT_MAX310X))
- return 0;
- if (ser->irq == port->irq)
- return 0;
+ if ((s->type != PORT_UNKNOWN) && (s->type != PORT_MAX310X))
+ return -EINVAL;
+ if (s->irq != port->irq)
+ return -EINVAL;
- return -EINVAL;
+ return 0;
}
-static struct uart_ops max310x_ops = {
+static void max310x_null_void(struct uart_port *port)
+{
+ /* Do nothing */
+}
+
+static const struct uart_ops max310x_ops = {
.tx_empty = max310x_tx_empty,
.set_mctrl = max310x_set_mctrl,
.get_mctrl = max310x_get_mctrl,
- .stop_tx = max310x_stop_tx,
+ .stop_tx = max310x_null_void,
.start_tx = max310x_start_tx,
- .stop_rx = max310x_stop_rx,
- .enable_ms = max310x_enable_ms,
+ .stop_rx = max310x_null_void,
+ .enable_ms = max310x_null_void,
.break_ctl = max310x_break_ctl,
.startup = max310x_startup,
.shutdown = max310x_shutdown,
.set_termios = max310x_set_termios,
.type = max310x_type,
.request_port = max310x_request_port,
- .release_port = max310x_release_port,
+ .release_port = max310x_null_void,
.config_port = max310x_config_port,
.verify_port = max310x_verify_port,
};
-#ifdef CONFIG_PM_SLEEP
-
-static int max310x_suspend(struct device *dev)
+static int __maybe_unused max310x_suspend(struct device *dev)
{
- int ret;
struct max310x_port *s = dev_get_drvdata(dev);
+ int i;
- dev_dbg(dev, "Suspend\n");
-
- ret = uart_suspend_port(&s->uart, &s->port);
-
- mutex_lock(&s->max310x_mutex);
-
- /* Enable sleep mode */
- regmap_update_bits(s->regmap, MAX310X_MODE1_REG,
- MAX310X_MODE1_FORCESLEEP_BIT,
- MAX310X_MODE1_FORCESLEEP_BIT);
-
- mutex_unlock(&s->max310x_mutex);
-
- if (s->pdata->suspend)
- s->pdata->suspend(1);
+ for (i = 0; i < s->uart.nr; i++) {
+ uart_suspend_port(&s->uart, &s->p[i].port);
+ s->devtype->power(&s->p[i].port, 0);
+ }
- return ret;
+ return 0;
}
-static int max310x_resume(struct device *dev)
+static int __maybe_unused max310x_resume(struct device *dev)
{
struct max310x_port *s = dev_get_drvdata(dev);
+ int i;
- dev_dbg(dev, "Resume\n");
-
- if (s->pdata->suspend)
- s->pdata->suspend(0);
-
- mutex_lock(&s->max310x_mutex);
-
- /* Disable sleep mode */
- regmap_update_bits(s->regmap, MAX310X_MODE1_REG,
- MAX310X_MODE1_FORCESLEEP_BIT,
- 0);
-
- max310x_wait_pll(s);
-
- mutex_unlock(&s->max310x_mutex);
+ for (i = 0; i < s->uart.nr; i++) {
+ s->devtype->power(&s->p[i].port, 1);
+ uart_resume_port(&s->uart, &s->p[i].port);
+ }
- return uart_resume_port(&s->uart, &s->port);
+ return 0;
}
-static SIMPLE_DEV_PM_OPS(max310x_pm_ops, max310x_suspend, max310x_resume);
-#define MAX310X_PM_OPS (&max310x_pm_ops)
-
-#else
-#define MAX310X_PM_OPS NULL
-#endif
-
#ifdef CONFIG_GPIOLIB
static int max310x_gpio_get(struct gpio_chip *chip, unsigned offset)
{
- unsigned int val = 0;
+ unsigned int val;
struct max310x_port *s = container_of(chip, struct max310x_port, gpio);
+ struct uart_port *port = &s->p[offset / 4].port;
- mutex_lock(&s->max310x_mutex);
- regmap_read(s->regmap, MAX310X_GPIODATA_REG, &val);
- mutex_unlock(&s->max310x_mutex);
+ val = max310x_port_read(port, MAX310X_GPIODATA_REG);
- return !!((val >> 4) & (1 << offset));
+ return !!((val >> 4) & (1 << (offset % 4)));
}
static void max310x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct max310x_port *s = container_of(chip, struct max310x_port, gpio);
+ struct uart_port *port = &s->p[offset / 4].port;
- mutex_lock(&s->max310x_mutex);
- regmap_update_bits(s->regmap, MAX310X_GPIODATA_REG, 1 << offset, value ?
- 1 << offset : 0);
- mutex_unlock(&s->max310x_mutex);
+ max310x_port_update(port, MAX310X_GPIODATA_REG, 1 << (offset % 4),
+ value ? 1 << (offset % 4) : 0);
}
static int max310x_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
struct max310x_port *s = container_of(chip, struct max310x_port, gpio);
+ struct uart_port *port = &s->p[offset / 4].port;
- mutex_lock(&s->max310x_mutex);
-
- regmap_update_bits(s->regmap, MAX310X_GPIOCFG_REG, 1 << offset, 0);
-
- mutex_unlock(&s->max310x_mutex);
+ max310x_port_update(port, MAX310X_GPIOCFG_REG, 1 << (offset % 4), 0);
return 0;
}
@@ -977,74 +1052,42 @@ static int max310x_gpio_direction_output(struct gpio_chip *chip,
unsigned offset, int value)
{
struct max310x_port *s = container_of(chip, struct max310x_port, gpio);
+ struct uart_port *port = &s->p[offset / 4].port;
- mutex_lock(&s->max310x_mutex);
-
- regmap_update_bits(s->regmap, MAX310X_GPIOCFG_REG, 1 << offset,
- 1 << offset);
- regmap_update_bits(s->regmap, MAX310X_GPIODATA_REG, 1 << offset, value ?
- 1 << offset : 0);
-
- mutex_unlock(&s->max310x_mutex);
+ max310x_port_update(port, MAX310X_GPIODATA_REG, 1 << (offset % 4),
+ value ? 1 << (offset % 4) : 0);
+ max310x_port_update(port, MAX310X_GPIOCFG_REG, 1 << (offset % 4),
+ 1 << (offset % 4));
return 0;
}
#endif
-/* Generic platform data */
-static struct max310x_pdata generic_plat_data = {
- .driver_flags = MAX310X_EXT_CLK,
- .uart_flags[0] = MAX310X_ECHO_SUPRESS,
- .frequency = 26000000,
-};
-
-static int max310x_probe(struct spi_device *spi)
+static int max310x_probe(struct device *dev, int is_spi,
+ struct max310x_devtype *devtype, int irq)
{
struct max310x_port *s;
- struct device *dev = &spi->dev;
- int chiptype = spi_get_device_id(spi)->driver_data;
- struct max310x_pdata *pdata = dev->platform_data;
- unsigned int val = 0;
- int ret;
+ struct max310x_pdata *pdata = dev_get_platdata(dev);
+ int i, ret, uartclk;
/* Check for IRQ */
- if (spi->irq <= 0) {
+ if (irq <= 0) {
dev_err(dev, "No IRQ specified\n");
return -ENOTSUPP;
}
+ if (!pdata) {
+ dev_err(dev, "No platform data supplied\n");
+ return -EINVAL;
+ }
+
/* Alloc port structure */
- s = devm_kzalloc(dev, sizeof(struct max310x_port), GFP_KERNEL);
+ s = devm_kzalloc(dev, sizeof(*s) +
+ sizeof(struct max310x_one) * devtype->nr, GFP_KERNEL);
if (!s) {
dev_err(dev, "Error allocating port structure\n");
return -ENOMEM;
}
- dev_set_drvdata(dev, s);
-
- if (!pdata) {
- dev_warn(dev, "No platform data supplied, using defaults\n");
- pdata = &generic_plat_data;
- }
- s->pdata = pdata;
-
- /* Individual chip settings */
- switch (chiptype) {
- case MAX310X_TYPE_MAX3107:
- s->name = "MAX3107";
- s->nr_gpio = 4;
- s->uart.nr = 1;
- s->regcfg.max_register = 0x1f;
- break;
- case MAX310X_TYPE_MAX3108:
- s->name = "MAX3108";
- s->nr_gpio = 4;
- s->uart.nr = 1;
- s->regcfg.max_register = 0x1e;
- break;
- default:
- dev_err(dev, "Unsupported chip type %i\n", chiptype);
- return -ENOTSUPP;
- }
/* Check input frequency */
if ((pdata->driver_flags & MAX310X_EXT_CLK) &&
@@ -1055,13 +1098,11 @@ static int max310x_probe(struct spi_device *spi)
((pdata->frequency < 1000000) || (pdata->frequency > 4000000)))
goto err_freq;
- mutex_init(&s->max310x_mutex);
+ s->pdata = pdata;
+ s->devtype = devtype;
+ dev_set_drvdata(dev, s);
- /* Setup SPI bus */
- spi->mode = SPI_MODE_0;
- spi->bits_per_word = 8;
- spi->max_speed_hz = 26000000;
- spi_setup(spi);
+ mutex_init(&s->mutex);
/* Setup regmap */
s->regcfg.reg_bits = 8;
@@ -1069,109 +1110,100 @@ static int max310x_probe(struct spi_device *spi)
s->regcfg.read_flag_mask = 0x00;
s->regcfg.write_flag_mask = 0x80;
s->regcfg.cache_type = REGCACHE_RBTREE;
- s->regcfg.writeable_reg = max3107_8_reg_writeable;
+ s->regcfg.writeable_reg = max310x_reg_writeable;
s->regcfg.volatile_reg = max310x_reg_volatile;
s->regcfg.precious_reg = max310x_reg_precious;
- s->regmap = devm_regmap_init_spi(spi, &s->regcfg);
+ s->regcfg.max_register = devtype->nr * 0x20 - 1;
+
+ if (IS_ENABLED(CONFIG_SPI_MASTER) && is_spi) {
+ struct spi_device *spi = to_spi_device(dev);
+
+ s->regmap = devm_regmap_init_spi(spi, &s->regcfg);
+ } else
+ return -ENOTSUPP;
+
if (IS_ERR(s->regmap)) {
- ret = PTR_ERR(s->regmap);
dev_err(dev, "Failed to initialize register map\n");
- goto err_out;
- }
-
- /* Reset chip & check SPI function */
- ret = regmap_write(s->regmap, MAX310X_MODE2_REG, MAX310X_MODE2_RST_BIT);
- if (ret) {
- dev_err(dev, "SPI transfer failed\n");
- goto err_out;
- }
- /* Clear chip reset */
- regmap_write(s->regmap, MAX310X_MODE2_REG, 0);
-
- switch (chiptype) {
- case MAX310X_TYPE_MAX3107:
- /* Check REV ID to ensure we are talking to what we expect */
- regmap_read(s->regmap, MAX3107_REVID_REG, &val);
- if (((val & MAX3107_REV_MASK) != MAX3107_REV_ID)) {
- dev_err(dev, "%s ID 0x%02x does not match\n",
- s->name, val);
- ret = -ENODEV;
- goto err_out;
- }
- break;
- case MAX310X_TYPE_MAX3108:
- /* MAX3108 have not REV ID register, we just check default value
- * from clocksource register to make sure everything works.
- */
- regmap_read(s->regmap, MAX310X_CLKSRC_REG, &val);
- if (val != (MAX310X_CLKSRC_EXTCLK_BIT |
- MAX310X_CLKSRC_PLLBYP_BIT)) {
- dev_err(dev, "%s not present\n", s->name);
- ret = -ENODEV;
- goto err_out;
- }
- break;
+ return PTR_ERR(s->regmap);
}
/* Board specific configure */
- if (pdata->init)
- pdata->init();
- if (pdata->suspend)
- pdata->suspend(0);
-
- /* Calculate referecne clock */
- s->uartclk = max310x_set_ref_clk(s);
-
- /* Disable all interrupts */
- regmap_write(s->regmap, MAX310X_IRQEN_REG, 0);
-
- /* Setup MODE1 register */
- val = MAX310X_MODE1_IRQSEL_BIT; /* Enable IRQ pin */
- if (pdata->driver_flags & MAX310X_AUTOSLEEP)
- val = MAX310X_MODE1_AUTOSLEEP_BIT;
- regmap_write(s->regmap, MAX310X_MODE1_REG, val);
-
- /* Setup interrupt */
- ret = devm_request_threaded_irq(dev, spi->irq, NULL, max310x_ist,
- IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
- dev_name(dev), s);
- if (ret) {
- dev_err(dev, "Unable to reguest IRQ %i\n", spi->irq);
- goto err_out;
+ if (s->pdata->init)
+ s->pdata->init();
+
+ /* Check device to ensure we are talking to what we expect */
+ ret = devtype->detect(dev);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < devtype->nr; i++) {
+ unsigned int offs = i << 5;
+
+ /* Reset port */
+ regmap_write(s->regmap, MAX310X_MODE2_REG + offs,
+ MAX310X_MODE2_RST_BIT);
+ /* Clear port reset */
+ regmap_write(s->regmap, MAX310X_MODE2_REG + offs, 0);
+
+ /* Wait for port startup */
+ do {
+ regmap_read(s->regmap,
+ MAX310X_BRGDIVLSB_REG + offs, &ret);
+ } while (ret != 0x01);
+
+ regmap_update_bits(s->regmap, MAX310X_MODE1_REG + offs,
+ MAX310X_MODE1_AUTOSLEEP_BIT,
+ MAX310X_MODE1_AUTOSLEEP_BIT);
}
+ uartclk = max310x_set_ref_clk(s);
+ dev_dbg(dev, "Reference clock set to %i Hz\n", uartclk);
+
/* Register UART driver */
s->uart.owner = THIS_MODULE;
- s->uart.driver_name = dev_name(dev);
s->uart.dev_name = "ttyMAX";
s->uart.major = MAX310X_MAJOR;
s->uart.minor = MAX310X_MINOR;
+ s->uart.nr = devtype->nr;
ret = uart_register_driver(&s->uart);
if (ret) {
dev_err(dev, "Registering UART driver failed\n");
- goto err_out;
+ return ret;
}
- /* Initialize workqueue for start TX */
- s->wq = create_freezable_workqueue(dev_name(dev));
- INIT_WORK(&s->tx_work, max310x_wq_proc);
-
- /* Initialize UART port data */
- s->port.line = 0;
- s->port.dev = dev;
- s->port.irq = spi->irq;
- s->port.type = PORT_MAX310X;
- s->port.fifosize = MAX310X_FIFO_SIZE;
- s->port.flags = UPF_SKIP_TEST | UPF_FIXED_TYPE;
- s->port.iotype = UPIO_PORT;
- s->port.membase = (void __iomem *)0xffffffff; /* Bogus value */
- s->port.uartclk = s->uartclk;
- s->port.ops = &max310x_ops;
- uart_add_one_port(&s->uart, &s->port);
+ for (i = 0; i < devtype->nr; i++) {
+ /* Initialize port data */
+ s->p[i].port.line = i;
+ s->p[i].port.dev = dev;
+ s->p[i].port.irq = irq;
+ s->p[i].port.type = PORT_MAX310X;
+ s->p[i].port.fifosize = MAX310X_FIFO_SIZE;
+ s->p[i].port.flags = UPF_SKIP_TEST | UPF_FIXED_TYPE |
+ UPF_LOW_LATENCY;
+ s->p[i].port.iotype = UPIO_PORT;
+ s->p[i].port.iobase = i * 0x20;
+ s->p[i].port.membase = (void __iomem *)~0;
+ s->p[i].port.uartclk = uartclk;
+ s->p[i].port.ops = &max310x_ops;
+ /* Disable all interrupts */
+ max310x_port_write(&s->p[i].port, MAX310X_IRQEN_REG, 0);
+ /* Clear IRQ status register */
+ max310x_port_read(&s->p[i].port, MAX310X_IRQSTS_REG);
+ /* Enable IRQ pin */
+ max310x_port_update(&s->p[i].port, MAX310X_MODE1_REG,
+ MAX310X_MODE1_IRQSEL_BIT,
+ MAX310X_MODE1_IRQSEL_BIT);
+ /* Initialize queue for start TX */
+ INIT_WORK(&s->p[i].tx_work, max310x_wq_proc);
+ /* Register port */
+ uart_add_one_port(&s->uart, &s->p[i].port);
+ /* Go to suspend mode */
+ devtype->power(&s->p[i].port, 0);
+ }
#ifdef CONFIG_GPIOLIB
/* Setup GPIO cotroller */
- if (pdata->gpio_base) {
+ if (s->pdata->gpio_base) {
s->gpio.owner = THIS_MODULE;
s->gpio.dev = dev;
s->gpio.label = dev_name(dev);
@@ -1179,86 +1211,107 @@ static int max310x_probe(struct spi_device *spi)
s->gpio.get = max310x_gpio_get;
s->gpio.direction_output= max310x_gpio_direction_output;
s->gpio.set = max310x_gpio_set;
- s->gpio.base = pdata->gpio_base;
- s->gpio.ngpio = s->nr_gpio;
+ s->gpio.base = s->pdata->gpio_base;
+ s->gpio.ngpio = devtype->nr * 4;
s->gpio.can_sleep = 1;
- if (gpiochip_add(&s->gpio)) {
- /* Indicate that we should not call gpiochip_remove */
- s->gpio.base = 0;
- }
+ if (!gpiochip_add(&s->gpio))
+ s->gpio_used = 1;
} else
dev_info(dev, "GPIO support not enabled\n");
#endif
- /* Go to suspend mode */
- if (pdata->suspend)
- pdata->suspend(1);
+ /* Setup interrupt */
+ ret = devm_request_threaded_irq(dev, irq, NULL, max310x_ist,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ dev_name(dev), s);
+ if (ret) {
+ dev_err(dev, "Unable to reguest IRQ %i\n", irq);
+#ifdef CONFIG_GPIOLIB
+ if (s->gpio_used)
+ WARN_ON(gpiochip_remove(&s->gpio));
+#endif
+ }
- return 0;
+ return ret;
err_freq:
dev_err(dev, "Frequency parameter incorrect\n");
- ret = -EINVAL;
-
-err_out:
- dev_set_drvdata(dev, NULL);
-
- return ret;
+ return -EINVAL;
}
-static int max310x_remove(struct spi_device *spi)
+static int max310x_remove(struct device *dev)
{
- struct device *dev = &spi->dev;
struct max310x_port *s = dev_get_drvdata(dev);
- int ret = 0;
-
- dev_dbg(dev, "Removing port\n");
-
- devm_free_irq(dev, s->port.irq, s);
-
- destroy_workqueue(s->wq);
+ int i, ret = 0;
- uart_remove_one_port(&s->uart, &s->port);
+ for (i = 0; i < s->uart.nr; i++) {
+ cancel_work_sync(&s->p[i].tx_work);
+ uart_remove_one_port(&s->uart, &s->p[i].port);
+ s->devtype->power(&s->p[i].port, 0);
+ }
uart_unregister_driver(&s->uart);
#ifdef CONFIG_GPIOLIB
- if (s->pdata->gpio_base) {
+ if (s->gpio_used)
ret = gpiochip_remove(&s->gpio);
- if (ret)
- dev_err(dev, "Failed to remove gpio chip: %d\n", ret);
- }
#endif
- dev_set_drvdata(dev, NULL);
-
- if (s->pdata->suspend)
- s->pdata->suspend(1);
if (s->pdata->exit)
s->pdata->exit();
return ret;
}
+#ifdef CONFIG_SPI_MASTER
+static int max310x_spi_probe(struct spi_device *spi)
+{
+ struct max310x_devtype *devtype =
+ (struct max310x_devtype *)spi_get_device_id(spi)->driver_data;
+ int ret;
+
+ /* Setup SPI bus */
+ spi->bits_per_word = 8;
+ spi->mode = spi->mode ? : SPI_MODE_0;
+ spi->max_speed_hz = spi->max_speed_hz ? : 26000000;
+ ret = spi_setup(spi);
+ if (ret) {
+ dev_err(&spi->dev, "SPI setup failed\n");
+ return ret;
+ }
+
+ return max310x_probe(&spi->dev, 1, devtype, spi->irq);
+}
+
+static int max310x_spi_remove(struct spi_device *spi)
+{
+ return max310x_remove(&spi->dev);
+}
+
+static SIMPLE_DEV_PM_OPS(max310x_pm_ops, max310x_suspend, max310x_resume);
+
static const struct spi_device_id max310x_id_table[] = {
- { "max3107", MAX310X_TYPE_MAX3107 },
- { "max3108", MAX310X_TYPE_MAX3108 },
+ { "max3107", (kernel_ulong_t)&max3107_devtype, },
+ { "max3108", (kernel_ulong_t)&max3108_devtype, },
+ { "max3109", (kernel_ulong_t)&max3109_devtype, },
+ { "max14830", (kernel_ulong_t)&max14830_devtype, },
{ }
};
MODULE_DEVICE_TABLE(spi, max310x_id_table);
-static struct spi_driver max310x_driver = {
+static struct spi_driver max310x_uart_driver = {
.driver = {
- .name = "max310x",
+ .name = MAX310X_NAME,
.owner = THIS_MODULE,
- .pm = MAX310X_PM_OPS,
+ .pm = &max310x_pm_ops,
},
- .probe = max310x_probe,
- .remove = max310x_remove,
+ .probe = max310x_spi_probe,
+ .remove = max310x_spi_remove,
.id_table = max310x_id_table,
};
-module_spi_driver(max310x_driver);
+module_spi_driver(max310x_uart_driver);
+#endif
-MODULE_LICENSE("GPL v2");
+MODULE_LICENSE("GPL");
MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
MODULE_DESCRIPTION("MAX310X serial driver");
diff --git a/drivers/tty/serial/mcf.c b/drivers/tty/serial/mcf.c
index 65be0c0..0edfaf8 100644
--- a/drivers/tty/serial/mcf.c
+++ b/drivers/tty/serial/mcf.c
@@ -24,6 +24,7 @@
#include <linux/serial_core.h>
#include <linux/io.h>
#include <linux/uaccess.h>
+#include <linux/platform_device.h>
#include <asm/coldfire.h>
#include <asm/mcfsim.h>
#include <asm/mcfuart.h>
@@ -324,7 +325,9 @@ static void mcf_rx_chars(struct mcf_uart *pp)
uart_insert_char(port, status, MCFUART_USR_RXOVERRUN, ch, flag);
}
+ spin_unlock(&port->lock);
tty_flip_buffer_push(&port->state->port);
+ spin_lock(&port->lock);
}
/****************************************************************************/
@@ -644,7 +647,7 @@ static struct uart_driver mcf_driver = {
static int mcf_probe(struct platform_device *pdev)
{
- struct mcf_platform_uart *platp = pdev->dev.platform_data;
+ struct mcf_platform_uart *platp = dev_get_platdata(&pdev->dev);
struct uart_port *port;
int i;
diff --git a/drivers/tty/serial/mfd.c b/drivers/tty/serial/mfd.c
index 4a82267..d3db042 100644
--- a/drivers/tty/serial/mfd.c
+++ b/drivers/tty/serial/mfd.c
@@ -386,7 +386,7 @@ static void serial_hsu_stop_tx(struct uart_port *port)
/* This is always called in spinlock protected mode, so
* modify timeout timer is safe here */
-void hsu_dma_rx(struct uart_hsu_port *up, u32 int_sts)
+void hsu_dma_rx(struct uart_hsu_port *up, u32 int_sts, unsigned long *flags)
{
struct hsu_dma_buffer *dbuf = &up->rxbuf;
struct hsu_dma_chan *chan = up->rxc;
@@ -438,7 +438,9 @@ void hsu_dma_rx(struct uart_hsu_port *up, u32 int_sts)
| (0x1 << 16)
| (0x1 << 24) /* timeout bit, see HSU Errata 1 */
);
+ spin_unlock_irqrestore(&up->port.lock, *flags);
tty_flip_buffer_push(tport);
+ spin_lock_irqsave(&up->port.lock, *flags);
chan_writel(chan, HSU_CH_CR, 0x3);
@@ -459,7 +461,8 @@ static void serial_hsu_stop_rx(struct uart_port *port)
}
}
-static inline void receive_chars(struct uart_hsu_port *up, int *status)
+static inline void receive_chars(struct uart_hsu_port *up, int *status,
+ unsigned long *flags)
{
unsigned int ch, flag;
unsigned int max_count = 256;
@@ -519,7 +522,10 @@ static inline void receive_chars(struct uart_hsu_port *up, int *status)
ignore_char:
*status = serial_in(up, UART_LSR);
} while ((*status & UART_LSR_DR) && max_count--);
+
+ spin_unlock_irqrestore(&up->port.lock, *flags);
tty_flip_buffer_push(&up->port.state->port);
+ spin_lock_irqsave(&up->port.lock, *flags);
}
static void transmit_chars(struct uart_hsu_port *up)
@@ -613,7 +619,7 @@ static irqreturn_t port_irq(int irq, void *dev_id)
lsr = serial_in(up, UART_LSR);
if (lsr & UART_LSR_DR)
- receive_chars(up, &lsr);
+ receive_chars(up, &lsr, &flags);
check_modem_status(up);
/* lsr will be renewed during the receive_chars */
@@ -643,7 +649,7 @@ static inline void dma_chan_irq(struct hsu_dma_chan *chan)
/* Rx channel */
if (chan->dirt == DMA_FROM_DEVICE)
- hsu_dma_rx(up, int_sts);
+ hsu_dma_rx(up, int_sts, &flags);
/* Tx channel */
if (chan->dirt == DMA_TO_DEVICE) {
diff --git a/drivers/tty/serial/mpsc.c b/drivers/tty/serial/mpsc.c
index bc24f49..8d70267 100644
--- a/drivers/tty/serial/mpsc.c
+++ b/drivers/tty/serial/mpsc.c
@@ -934,7 +934,7 @@ static int serial_polled;
******************************************************************************
*/
-static int mpsc_rx_intr(struct mpsc_port_info *pi)
+static int mpsc_rx_intr(struct mpsc_port_info *pi, unsigned long *flags)
{
struct mpsc_rx_desc *rxre;
struct tty_port *port = &pi->port.state->port;
@@ -969,8 +969,11 @@ static int mpsc_rx_intr(struct mpsc_port_info *pi)
#endif
/* Following use of tty struct directly is deprecated */
if (tty_buffer_request_room(port, bytes_in) < bytes_in) {
- if (port->low_latency)
+ if (port->low_latency) {
+ spin_unlock_irqrestore(&pi->port.lock, *flags);
tty_flip_buffer_push(port);
+ spin_lock_irqsave(&pi->port.lock, *flags);
+ }
/*
* If this failed then we will throw away the bytes
* but must do so to clear interrupts.
@@ -1080,7 +1083,9 @@ next_frame:
if ((readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_ERD) == 0)
mpsc_start_rx(pi);
+ spin_unlock_irqrestore(&pi->port.lock, *flags);
tty_flip_buffer_push(port);
+ spin_lock_irqsave(&pi->port.lock, *flags);
return rc;
}
@@ -1222,7 +1227,7 @@ static irqreturn_t mpsc_sdma_intr(int irq, void *dev_id)
spin_lock_irqsave(&pi->port.lock, iflags);
mpsc_sdma_intr_ack(pi);
- if (mpsc_rx_intr(pi))
+ if (mpsc_rx_intr(pi, &iflags))
rc = IRQ_HANDLED;
if (mpsc_tx_intr(pi))
rc = IRQ_HANDLED;
@@ -1884,7 +1889,7 @@ static int mpsc_shared_drv_probe(struct platform_device *dev)
if (dev->id == 0) {
if (!(rc = mpsc_shared_map_regs(dev))) {
pdata = (struct mpsc_shared_pdata *)
- dev->dev.platform_data;
+ dev_get_platdata(&dev->dev);
mpsc_shared_regs.MPSC_MRR_m = pdata->mrr_val;
mpsc_shared_regs.MPSC_RCRR_m= pdata->rcrr_val;
@@ -2025,7 +2030,7 @@ static void mpsc_drv_get_platform_data(struct mpsc_port_info *pi,
{
struct mpsc_pdata *pdata;
- pdata = (struct mpsc_pdata *)pd->dev.platform_data;
+ pdata = (struct mpsc_pdata *)dev_get_platdata(&pd->dev);
pi->port.uartclk = pdata->brg_clk_freq;
pi->port.iotype = UPIO_MEM;
diff --git a/drivers/tty/serial/mrst_max3110.c b/drivers/tty/serial/mrst_max3110.c
index 9b6ef20..a67e708 100644
--- a/drivers/tty/serial/mrst_max3110.c
+++ b/drivers/tty/serial/mrst_max3110.c
@@ -713,7 +713,7 @@ static void serial_m3110_enable_ms(struct uart_port *port)
{
}
-struct uart_ops serial_m3110_ops = {
+static struct uart_ops serial_m3110_ops = {
.tx_empty = serial_m3110_tx_empty,
.set_mctrl = serial_m3110_set_mctrl,
.get_mctrl = serial_m3110_get_mctrl,
@@ -844,7 +844,7 @@ static int serial_m3110_probe(struct spi_device *spi)
pmax = max;
/* Give membase a psudo value to pass serial_core's check */
- max->port.membase = (void *)0xff110000;
+ max->port.membase = (unsigned char __iomem *)0xff110000;
uart_add_one_port(&serial_m3110_reg, &max->port);
return 0;
diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index 2c6cfb3..b5d779c 100644
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -45,16 +45,19 @@ struct msm_port {
struct clk *clk;
struct clk *pclk;
unsigned int imr;
- unsigned int *gsbi_base;
+ void __iomem *gsbi_base;
int is_uartdm;
unsigned int old_snap_state;
};
-static inline void wait_for_xmitr(struct uart_port *port, int bits)
+static inline void wait_for_xmitr(struct uart_port *port)
{
- if (!(msm_read(port, UART_SR) & UART_SR_TX_EMPTY))
- while ((msm_read(port, UART_ISR) & bits) != bits)
- cpu_relax();
+ while (!(msm_read(port, UART_SR) & UART_SR_TX_EMPTY)) {
+ if (msm_read(port, UART_ISR) & UART_ISR_TX_READY)
+ break;
+ udelay(1);
+ }
+ msm_write(port, UART_CR_CMD_RESET_TX_READY, UART_CR);
}
static void msm_stop_tx(struct uart_port *port)
@@ -137,7 +140,10 @@ static void handle_rx_dm(struct uart_port *port, unsigned int misr)
count -= 4;
}
+ spin_unlock(&port->lock);
tty_flip_buffer_push(tport);
+ spin_lock(&port->lock);
+
if (misr & (UART_IMR_RXSTALE))
msm_write(port, UART_CR_CMD_RESET_STALE_INT, UART_CR);
msm_write(port, 0xFFFFFF, UARTDM_DMRX);
@@ -189,52 +195,69 @@ static void handle_rx(struct uart_port *port)
tty_insert_flip_char(tport, c, flag);
}
+ spin_unlock(&port->lock);
tty_flip_buffer_push(tport);
+ spin_lock(&port->lock);
}
-static void reset_dm_count(struct uart_port *port)
+static void reset_dm_count(struct uart_port *port, int count)
{
- wait_for_xmitr(port, UART_ISR_TX_READY);
- msm_write(port, 1, UARTDM_NCF_TX);
+ wait_for_xmitr(port);
+ msm_write(port, count, UARTDM_NCF_TX);
+ msm_read(port, UARTDM_NCF_TX);
}
static void handle_tx(struct uart_port *port)
{
struct circ_buf *xmit = &port->state->xmit;
struct msm_port *msm_port = UART_TO_MSM(port);
- int sent_tx;
+ unsigned int tx_count, num_chars;
+ unsigned int tf_pointer = 0;
+
+ tx_count = uart_circ_chars_pending(xmit);
+ tx_count = min3(tx_count, (unsigned int)UART_XMIT_SIZE - xmit->tail,
+ port->fifosize);
if (port->x_char) {
if (msm_port->is_uartdm)
- reset_dm_count(port);
+ reset_dm_count(port, tx_count + 1);
msm_write(port, port->x_char,
msm_port->is_uartdm ? UARTDM_TF : UART_TF);
port->icount.tx++;
port->x_char = 0;
+ } else if (tx_count && msm_port->is_uartdm) {
+ reset_dm_count(port, tx_count);
}
- if (msm_port->is_uartdm)
- reset_dm_count(port);
+ while (tf_pointer < tx_count) {
+ int i;
+ char buf[4] = { 0 };
+ unsigned int *bf = (unsigned int *)&buf;
- while (msm_read(port, UART_SR) & UART_SR_TX_READY) {
- if (uart_circ_empty(xmit)) {
- /* disable tx interrupts */
- msm_port->imr &= ~UART_IMR_TXLEV;
- msm_write(port, msm_port->imr, UART_IMR);
+ if (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
break;
- }
- msm_write(port, xmit->buf[xmit->tail],
- msm_port->is_uartdm ? UARTDM_TF : UART_TF);
if (msm_port->is_uartdm)
- reset_dm_count(port);
+ num_chars = min(tx_count - tf_pointer,
+ (unsigned int)sizeof(buf));
+ else
+ num_chars = 1;
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
- sent_tx = 1;
+ for (i = 0; i < num_chars; i++) {
+ buf[i] = xmit->buf[xmit->tail + i];
+ port->icount.tx++;
+ }
+
+ msm_write(port, *bf, msm_port->is_uartdm ? UARTDM_TF : UART_TF);
+ xmit->tail = (xmit->tail + num_chars) & (UART_XMIT_SIZE - 1);
+ tf_pointer += num_chars;
}
+ /* disable tx interrupts if nothing more to send */
+ if (uart_circ_empty(xmit))
+ msm_stop_tx(port);
+
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
}
@@ -295,7 +318,7 @@ static void msm_reset(struct uart_port *port)
msm_write(port, UART_CR_CMD_SET_RFR, UART_CR);
}
-void msm_set_mctrl(struct uart_port *port, unsigned int mctrl)
+static void msm_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
unsigned int mr;
mr = msm_read(port, UART_MR1);
@@ -318,70 +341,60 @@ static void msm_break_ctl(struct uart_port *port, int break_ctl)
msm_write(port, UART_CR_CMD_STOP_BREAK, UART_CR);
}
+struct msm_baud_map {
+ u16 divisor;
+ u8 code;
+ u8 rxstale;
+};
+
+static const struct msm_baud_map *
+msm_find_best_baud(struct uart_port *port, unsigned int baud)
+{
+ unsigned int i, divisor;
+ const struct msm_baud_map *entry;
+ static const struct msm_baud_map table[] = {
+ { 1536, 0x00, 1 },
+ { 768, 0x11, 1 },
+ { 384, 0x22, 1 },
+ { 192, 0x33, 1 },
+ { 96, 0x44, 1 },
+ { 48, 0x55, 1 },
+ { 32, 0x66, 1 },
+ { 24, 0x77, 1 },
+ { 16, 0x88, 1 },
+ { 12, 0x99, 6 },
+ { 8, 0xaa, 6 },
+ { 6, 0xbb, 6 },
+ { 4, 0xcc, 6 },
+ { 3, 0xdd, 8 },
+ { 2, 0xee, 16 },
+ { 1, 0xff, 31 },
+ };
+
+ divisor = uart_get_divisor(port, baud);
+
+ for (i = 0, entry = table; i < ARRAY_SIZE(table); i++, entry++)
+ if (entry->divisor <= divisor)
+ break;
+
+ return entry; /* Default to smallest divider */
+}
+
static int msm_set_baud_rate(struct uart_port *port, unsigned int baud)
{
- unsigned int baud_code, rxstale, watermark;
+ unsigned int rxstale, watermark;
struct msm_port *msm_port = UART_TO_MSM(port);
+ const struct msm_baud_map *entry;
- switch (baud) {
- case 300:
- baud_code = UART_CSR_300;
- rxstale = 1;
- break;
- case 600:
- baud_code = UART_CSR_600;
- rxstale = 1;
- break;
- case 1200:
- baud_code = UART_CSR_1200;
- rxstale = 1;
- break;
- case 2400:
- baud_code = UART_CSR_2400;
- rxstale = 1;
- break;
- case 4800:
- baud_code = UART_CSR_4800;
- rxstale = 1;
- break;
- case 9600:
- baud_code = UART_CSR_9600;
- rxstale = 2;
- break;
- case 14400:
- baud_code = UART_CSR_14400;
- rxstale = 3;
- break;
- case 19200:
- baud_code = UART_CSR_19200;
- rxstale = 4;
- break;
- case 28800:
- baud_code = UART_CSR_28800;
- rxstale = 6;
- break;
- case 38400:
- baud_code = UART_CSR_38400;
- rxstale = 8;
- break;
- case 57600:
- baud_code = UART_CSR_57600;
- rxstale = 16;
- break;
- case 115200:
- default:
- baud_code = UART_CSR_115200;
- baud = 115200;
- rxstale = 31;
- break;
- }
+ entry = msm_find_best_baud(port, baud);
if (msm_port->is_uartdm)
msm_write(port, UART_CR_CMD_RESET_RX, UART_CR);
- msm_write(port, baud_code, UART_CSR);
+ msm_write(port, entry->code, UART_CSR);
/* RX stale watermark */
+ rxstale = entry->rxstale;
watermark = UART_IPR_STALE_LSB & rxstale;
watermark |= UART_IPR_RXSTALE_LAST;
watermark |= UART_IPR_STALE_TIMEOUT_MSB & (rxstale << 2);
@@ -409,8 +422,7 @@ static void msm_init_clock(struct uart_port *port)
struct msm_port *msm_port = UART_TO_MSM(port);
clk_prepare_enable(msm_port->clk);
- if (!IS_ERR(msm_port->pclk))
- clk_prepare_enable(msm_port->pclk);
+ clk_prepare_enable(msm_port->pclk);
msm_serial_set_mnd_regs(port);
}
@@ -589,12 +601,10 @@ static void msm_release_port(struct uart_port *port)
port->membase = NULL;
if (msm_port->gsbi_base) {
- iowrite32(GSBI_PROTOCOL_IDLE, msm_port->gsbi_base +
- GSBI_CONTROL);
-
- gsbi_resource = platform_get_resource(pdev,
- IORESOURCE_MEM, 1);
+ writel_relaxed(GSBI_PROTOCOL_IDLE,
+ msm_port->gsbi_base + GSBI_CONTROL);
+ gsbi_resource = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (unlikely(!gsbi_resource))
return;
@@ -637,7 +647,7 @@ static int msm_request_port(struct uart_port *port)
if (!request_mem_region(gsbi_resource->start, size,
"msm_serial")) {
ret = -EBUSY;
- goto fail_release_port;
+ goto fail_release_port_membase;
}
msm_port->gsbi_base = ioremap(gsbi_resource->start, size);
@@ -651,6 +661,8 @@ static int msm_request_port(struct uart_port *port)
fail_release_gsbi:
release_mem_region(gsbi_resource->start, size);
+fail_release_port_membase:
+ iounmap(port->membase);
fail_release_port:
release_mem_region(port->mapbase, size);
return ret;
@@ -666,10 +678,9 @@ static void msm_config_port(struct uart_port *port, int flags)
if (ret)
return;
}
-
- if (msm_port->is_uartdm)
- iowrite32(GSBI_PROTOCOL_UART, msm_port->gsbi_base +
- GSBI_CONTROL);
+ if (msm_port->gsbi_base)
+ writel_relaxed(GSBI_PROTOCOL_UART,
+ msm_port->gsbi_base + GSBI_CONTROL);
}
static int msm_verify_port(struct uart_port *port, struct serial_struct *ser)
@@ -689,13 +700,11 @@ static void msm_power(struct uart_port *port, unsigned int state,
switch (state) {
case 0:
clk_prepare_enable(msm_port->clk);
- if (!IS_ERR(msm_port->pclk))
- clk_prepare_enable(msm_port->pclk);
+ clk_prepare_enable(msm_port->pclk);
break;
case 3:
clk_disable_unprepare(msm_port->clk);
- if (!IS_ERR(msm_port->pclk))
- clk_disable_unprepare(msm_port->pclk);
+ clk_disable_unprepare(msm_port->pclk);
break;
default:
printk(KERN_ERR "msm_serial: Unknown PM state %d\n", state);
@@ -760,32 +769,63 @@ static inline struct uart_port *get_port_from_line(unsigned int line)
}
#ifdef CONFIG_SERIAL_MSM_CONSOLE
-
-static void msm_console_putchar(struct uart_port *port, int c)
-{
- struct msm_port *msm_port = UART_TO_MSM(port);
-
- if (msm_port->is_uartdm)
- reset_dm_count(port);
-
- while (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
- ;
- msm_write(port, c, msm_port->is_uartdm ? UARTDM_TF : UART_TF);
-}
-
static void msm_console_write(struct console *co, const char *s,
unsigned int count)
{
+ int i;
struct uart_port *port;
struct msm_port *msm_port;
+ int num_newlines = 0;
+ bool replaced = false;
BUG_ON(co->index < 0 || co->index >= UART_NR);
port = get_port_from_line(co->index);
msm_port = UART_TO_MSM(port);
+ /* Account for newlines that will get a carriage return added */
+ for (i = 0; i < count; i++)
+ if (s[i] == '\n')
+ num_newlines++;
+ count += num_newlines;
+
spin_lock(&port->lock);
- uart_console_write(port, s, count, msm_console_putchar);
+ if (msm_port->is_uartdm)
+ reset_dm_count(port, count);
+
+ i = 0;
+ while (i < count) {
+ int j;
+ unsigned int num_chars;
+ char buf[4] = { 0 };
+ unsigned int *bf = (unsigned int *)&buf;
+
+ if (msm_port->is_uartdm)
+ num_chars = min(count - i, (unsigned int)sizeof(buf));
+ else
+ num_chars = 1;
+
+ for (j = 0; j < num_chars; j++) {
+ char c = *s;
+
+ if (c == '\n' && !replaced) {
+ buf[j] = '\r';
+ j++;
+ replaced = true;
+ }
+ if (j < num_chars) {
+ buf[j] = c;
+ s++;
+ replaced = false;
+ }
+ }
+
+ while (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
+ cpu_relax();
+
+ msm_write(port, *bf, msm_port->is_uartdm ? UARTDM_TF : UART_TF);
+ i += num_chars;
+ }
spin_unlock(&port->lock);
}
@@ -859,6 +899,11 @@ static struct uart_driver msm_uart_driver = {
static atomic_t msm_uart_next_id = ATOMIC_INIT(0);
+static const struct of_device_id msm_uartdm_table[] = {
+ { .compatible = "qcom,msm-uartdm" },
+ { }
+};
+
static int __init msm_serial_probe(struct platform_device *pdev)
{
struct msm_port *msm_port;
@@ -878,23 +923,17 @@ static int __init msm_serial_probe(struct platform_device *pdev)
port->dev = &pdev->dev;
msm_port = UART_TO_MSM(port);
- if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
+ if (of_match_device(msm_uartdm_table, &pdev->dev))
msm_port->is_uartdm = 1;
else
msm_port->is_uartdm = 0;
- if (msm_port->is_uartdm) {
- msm_port->clk = devm_clk_get(&pdev->dev, "gsbi_uart_clk");
- msm_port->pclk = devm_clk_get(&pdev->dev, "gsbi_pclk");
- } else {
- msm_port->clk = devm_clk_get(&pdev->dev, "uart_clk");
- msm_port->pclk = ERR_PTR(-ENOENT);
- }
-
+ msm_port->clk = devm_clk_get(&pdev->dev, "core");
if (IS_ERR(msm_port->clk))
return PTR_ERR(msm_port->clk);
if (msm_port->is_uartdm) {
+ msm_port->pclk = devm_clk_get(&pdev->dev, "iface");
if (IS_ERR(msm_port->pclk))
return PTR_ERR(msm_port->pclk);
@@ -931,6 +970,7 @@ static int msm_serial_remove(struct platform_device *pdev)
static struct of_device_id msm_match_table[] = {
{ .compatible = "qcom,msm-uart" },
+ { .compatible = "qcom,msm-uartdm" },
{}
};
diff --git a/drivers/tty/serial/msm_serial.h b/drivers/tty/serial/msm_serial.h
index e4acef5..469fda5 100644
--- a/drivers/tty/serial/msm_serial.h
+++ b/drivers/tty/serial/msm_serial.h
@@ -38,19 +38,7 @@
#define UART_MR2_PARITY_MODE_SPACE 0x3
#define UART_MR2_PARITY_MODE 0x3
-#define UART_CSR 0x0008
-#define UART_CSR_115200 0xFF
-#define UART_CSR_57600 0xEE
-#define UART_CSR_38400 0xDD
-#define UART_CSR_28800 0xCC
-#define UART_CSR_19200 0xBB
-#define UART_CSR_14400 0xAA
-#define UART_CSR_9600 0x99
-#define UART_CSR_4800 0x77
-#define UART_CSR_2400 0x55
-#define UART_CSR_1200 0x44
-#define UART_CSR_600 0x33
-#define UART_CSR_300 0x22
+#define UART_CSR 0x0008
#define UART_TF 0x000C
#define UARTDM_TF 0x0070
@@ -71,6 +59,7 @@
#define UART_CR_CMD_RESET_RFR (14 << 4)
#define UART_CR_CMD_PROTECTION_EN (16 << 4)
#define UART_CR_CMD_STALE_EVENT_ENABLE (80 << 4)
+#define UART_CR_CMD_RESET_TX_READY (3 << 8)
#define UART_CR_TX_DISABLE (1 << 3)
#define UART_CR_TX_ENABLE (1 << 2)
#define UART_CR_RX_DISABLE (1 << 1)
@@ -151,6 +140,7 @@ static inline void msm_serial_set_mnd_regs_tcxo(struct uart_port *port)
msm_write(port, 0xF1, UART_NREG);
msm_write(port, 0x0F, UART_DREG);
msm_write(port, 0x1A, UART_MNDREG);
+ port->uartclk = 1843200;
}
/*
@@ -162,6 +152,7 @@ static inline void msm_serial_set_mnd_regs_tcxoby4(struct uart_port *port)
msm_write(port, 0xF6, UART_NREG);
msm_write(port, 0x0F, UART_DREG);
msm_write(port, 0x0A, UART_MNDREG);
+ port->uartclk = 1843200;
}
static inline
@@ -169,7 +160,7 @@ void msm_serial_set_mnd_regs_from_uartclk(struct uart_port *port)
{
if (port->uartclk == 19200000)
msm_serial_set_mnd_regs_tcxo(port);
- else
+ else if (port->uartclk == 4800000)
msm_serial_set_mnd_regs_tcxoby4(port);
}
diff --git a/drivers/tty/serial/msm_serial_hs.c b/drivers/tty/serial/msm_serial_hs.c
index 4ca2f64..48e9496 100644
--- a/drivers/tty/serial/msm_serial_hs.c
+++ b/drivers/tty/serial/msm_serial_hs.c
@@ -1618,7 +1618,7 @@ static int msm_hs_probe(struct platform_device *pdev)
struct msm_hs_port *msm_uport;
struct resource *resource;
const struct msm_serial_hs_platform_data *pdata =
- pdev->dev.platform_data;
+ dev_get_platdata(&pdev->dev);
if (pdev->id < 0 || pdev->id >= UARTDM_NR) {
printk(KERN_ERR "Invalid plaform device ID = %d\n", pdev->id);
diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index f85b8e6..10e9d70 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -32,7 +32,6 @@
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/io.h>
-#include <linux/pinctrl/consumer.h>
#include <linux/of_device.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
@@ -134,10 +133,10 @@ enum mxs_auart_type {
struct mxs_auart_port {
struct uart_port port;
-#define MXS_AUART_DMA_CONFIG 0x1
#define MXS_AUART_DMA_ENABLED 0x2
#define MXS_AUART_DMA_TX_SYNC 2 /* bit 2 */
#define MXS_AUART_DMA_RX_READY 3 /* bit 3 */
+#define MXS_AUART_RTSCTS 4 /* bit 4 */
unsigned long flags;
unsigned int ctrl;
enum mxs_auart_type devtype;
@@ -640,7 +639,8 @@ static void mxs_auart_settermios(struct uart_port *u,
* we can only implement the DMA support for auart
* in mx28.
*/
- if (is_imx28_auart(s) && (s->flags & MXS_AUART_DMA_CONFIG)) {
+ if (is_imx28_auart(s)
+ && test_bit(MXS_AUART_RTSCTS, &s->flags)) {
if (!mxs_auart_dma_init(s))
/* enable DMA tranfer */
ctrl2 |= AUART_CTRL2_TXDMAE | AUART_CTRL2_RXDMAE
@@ -1008,7 +1008,8 @@ static int serial_mxs_probe_dt(struct mxs_auart_port *s,
}
s->port.line = ret;
- s->flags |= MXS_AUART_DMA_CONFIG;
+ if (of_get_property(np, "fsl,uart-has-rtscts", NULL))
+ set_bit(MXS_AUART_RTSCTS, &s->flags);
return 0;
}
@@ -1021,7 +1022,6 @@ static int mxs_auart_probe(struct platform_device *pdev)
u32 version;
int ret = 0;
struct resource *r;
- struct pinctrl *pinctrl;
s = kzalloc(sizeof(struct mxs_auart_port), GFP_KERNEL);
if (!s) {
@@ -1035,12 +1035,6 @@ static int mxs_auart_probe(struct platform_device *pdev)
else if (ret < 0)
goto out_free;
- pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
- if (IS_ERR(pinctrl)) {
- ret = PTR_ERR(pinctrl);
- goto out_free;
- }
-
if (of_id) {
pdev->id_entry = of_id->data;
s->devtype = pdev->id_entry->driver_data;
diff --git a/drivers/tty/serial/netx-serial.c b/drivers/tty/serial/netx-serial.c
index b9a40ed..0a4dd70 100644
--- a/drivers/tty/serial/netx-serial.c
+++ b/drivers/tty/serial/netx-serial.c
@@ -196,7 +196,7 @@ static void netx_txint(struct uart_port *port)
uart_write_wakeup(port);
}
-static void netx_rxint(struct uart_port *port)
+static void netx_rxint(struct uart_port *port, unsigned long *flags)
{
unsigned char rx, flg, status;
@@ -236,7 +236,9 @@ static void netx_rxint(struct uart_port *port)
uart_insert_char(port, status, SR_OE, rx, flg);
}
+ spin_unlock_irqrestore(&port->lock, *flags);
tty_flip_buffer_push(&port->state->port);
+ spin_lock_irqsave(&port->lock, *flags);
}
static irqreturn_t netx_int(int irq, void *dev_id)
@@ -250,7 +252,7 @@ static irqreturn_t netx_int(int irq, void *dev_id)
status = readl(port->membase + UART_IIR) & IIR_MASK;
while (status) {
if (status & IIR_RIS)
- netx_rxint(port);
+ netx_rxint(port, &flags);
if (status & IIR_TIS)
netx_txint(port);
if (status & IIR_MIS) {
@@ -693,8 +695,6 @@ static int serial_netx_remove(struct platform_device *pdev)
{
struct netx_port *sport = platform_get_drvdata(pdev);
- platform_set_drvdata(pdev, NULL);
-
if (sport)
uart_remove_one_port(&netx_reg, &sport->port);
diff --git a/drivers/tty/serial/nwpserial.c b/drivers/tty/serial/nwpserial.c
index 549c70a2..693bc6c 100644
--- a/drivers/tty/serial/nwpserial.c
+++ b/drivers/tty/serial/nwpserial.c
@@ -149,7 +149,10 @@ static irqreturn_t nwpserial_interrupt(int irq, void *dev_id)
tty_insert_flip_char(port, ch, TTY_NORMAL);
} while (dcr_read(up->dcr_host, UART_LSR) & UART_LSR_DR);
+ spin_unlock(&up->port.lock);
tty_flip_buffer_push(port);
+ spin_lock(&up->port.lock);
+
ret = IRQ_HANDLED;
/* clear interrupt */
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index b6d1728..816d1a2 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -40,9 +40,11 @@
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/gpio.h>
-#include <linux/pinctrl/consumer.h>
+#include <linux/of_gpio.h>
#include <linux/platform_data/serial-omap.h>
+#include <dt-bindings/gpio/gpio.h>
+
#define OMAP_MAX_HSUART_PORTS 6
#define UART_BUILD_REVISION(x, y) (((x) << 8) | (y))
@@ -52,6 +54,11 @@
#define OMAP_UART_REV_52 0x0502
#define OMAP_UART_REV_63 0x0603
+#define OMAP_UART_TX_WAKEUP_EN BIT(7)
+
+/* Feature flags */
+#define OMAP_UART_WER_HAS_TX_WAKEUP BIT(0)
+
#define UART_ERRATA_i202_MDR1_ACCESS BIT(0)
#define UART_ERRATA_i291_DMA_FORCEIDLE BIT(1)
@@ -137,6 +144,7 @@ struct uart_omap_port {
unsigned char dlh;
unsigned char mdr1;
unsigned char scr;
+ unsigned char wer;
int use_dma;
/*
@@ -151,16 +159,19 @@ struct uart_omap_port {
int context_loss_cnt;
u32 errata;
u8 wakeups_enabled;
+ u32 features;
int DTR_gpio;
int DTR_inverted;
int DTR_active;
+ struct serial_rs485 rs485;
+ int rts_gpio;
+
struct pm_qos_request pm_qos_request;
u32 latency;
u32 calc_latency;
struct work_struct qos_work;
- struct pinctrl *pins;
bool is_suspending;
};
@@ -195,7 +206,7 @@ static inline void serial_omap_clear_fifos(struct uart_omap_port *up)
static int serial_omap_get_context_loss_count(struct uart_omap_port *up)
{
- struct omap_uart_port_info *pdata = up->dev->platform_data;
+ struct omap_uart_port_info *pdata = dev_get_platdata(up->dev);
if (!pdata || !pdata->get_context_loss_count)
return -EINVAL;
@@ -205,7 +216,7 @@ static int serial_omap_get_context_loss_count(struct uart_omap_port *up)
static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable)
{
- struct omap_uart_port_info *pdata = up->dev->platform_data;
+ struct omap_uart_port_info *pdata = dev_get_platdata(up->dev);
if (!pdata || !pdata->enable_wakeup)
return;
@@ -272,13 +283,42 @@ static void serial_omap_enable_ms(struct uart_port *port)
static void serial_omap_stop_tx(struct uart_port *port)
{
struct uart_omap_port *up = to_uart_omap_port(port);
+ struct circ_buf *xmit = &up->port.state->xmit;
+ int res;
pm_runtime_get_sync(up->dev);
+
+ /* handle rs485 */
+ if (up->rs485.flags & SER_RS485_ENABLED) {
+ /* do nothing if current tx not yet completed */
+ res = serial_in(up, UART_LSR) & UART_LSR_TEMT;
+ if (!res)
+ return;
+
+ /* if there's no more data to send, turn off rts */
+ if (uart_circ_empty(xmit)) {
+ /* if rts not already disabled */
+ res = (up->rs485.flags & SER_RS485_RTS_AFTER_SEND) ? 1 : 0;
+ if (gpio_get_value(up->rts_gpio) != res) {
+ if (up->rs485.delay_rts_after_send > 0) {
+ mdelay(up->rs485.delay_rts_after_send);
+ }
+ gpio_set_value(up->rts_gpio, res);
+ }
+ }
+ }
+
if (up->ier & UART_IER_THRI) {
up->ier &= ~UART_IER_THRI;
serial_out(up, UART_IER, up->ier);
}
+ if ((up->rs485.flags & SER_RS485_ENABLED) &&
+ !(up->rs485.flags & SER_RS485_RX_DURING_TX)) {
+ up->ier = UART_IER_RLSI | UART_IER_RDI;
+ serial_out(up, UART_IER, up->ier);
+ }
+
pm_runtime_mark_last_busy(up->dev);
pm_runtime_put_autosuspend(up->dev);
}
@@ -340,8 +380,26 @@ static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
static void serial_omap_start_tx(struct uart_port *port)
{
struct uart_omap_port *up = to_uart_omap_port(port);
+ int res;
pm_runtime_get_sync(up->dev);
+
+ /* handle rs485 */
+ if (up->rs485.flags & SER_RS485_ENABLED) {
+ /* if rts not already enabled */
+ res = (up->rs485.flags & SER_RS485_RTS_ON_SEND) ? 1 : 0;
+ if (gpio_get_value(up->rts_gpio) != res) {
+ gpio_set_value(up->rts_gpio, res);
+ if (up->rs485.delay_rts_before_send > 0) {
+ mdelay(up->rs485.delay_rts_before_send);
+ }
+ }
+ }
+
+ if ((up->rs485.flags & SER_RS485_ENABLED) &&
+ !(up->rs485.flags & SER_RS485_RX_DURING_TX))
+ serial_omap_stop_rx(port);
+
serial_omap_enable_ier_thri(up);
pm_runtime_mark_last_busy(up->dev);
pm_runtime_put_autosuspend(up->dev);
@@ -683,7 +741,11 @@ static int serial_omap_startup(struct uart_port *port)
serial_out(up, UART_IER, up->ier);
/* Enable module level wake up */
- serial_out(up, UART_OMAP_WER, OMAP_UART_WER_MOD_WKUP);
+ up->wer = OMAP_UART_WER_MOD_WKUP;
+ if (up->features & OMAP_UART_WER_HAS_TX_WAKEUP)
+ up->wer |= OMAP_UART_TX_WAKEUP_EN;
+
+ serial_out(up, UART_OMAP_WER, up->wer);
pm_runtime_mark_last_busy(up->dev);
pm_runtime_put_autosuspend(up->dev);
@@ -1254,6 +1316,76 @@ static inline void serial_omap_add_console_port(struct uart_omap_port *up)
#endif
+/* Enable or disable the rs485 support */
+static void
+serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485conf)
+{
+ struct uart_omap_port *up = to_uart_omap_port(port);
+ unsigned long flags;
+ unsigned int mode;
+ int val;
+
+ pm_runtime_get_sync(up->dev);
+ spin_lock_irqsave(&up->port.lock, flags);
+
+ /* Disable interrupts from this port */
+ mode = up->ier;
+ up->ier = 0;
+ serial_out(up, UART_IER, 0);
+
+ /* store new config */
+ up->rs485 = *rs485conf;
+
+ /*
+ * Just as a precaution, only allow rs485
+ * to be enabled if the gpio pin is valid
+ */
+ if (gpio_is_valid(up->rts_gpio)) {
+ /* enable / disable rts */
+ val = (up->rs485.flags & SER_RS485_ENABLED) ?
+ SER_RS485_RTS_AFTER_SEND : SER_RS485_RTS_ON_SEND;
+ val = (up->rs485.flags & val) ? 1 : 0;
+ gpio_set_value(up->rts_gpio, val);
+ } else
+ up->rs485.flags &= ~SER_RS485_ENABLED;
+
+ /* Enable interrupts */
+ up->ier = mode;
+ serial_out(up, UART_IER, up->ier);
+
+ spin_unlock_irqrestore(&up->port.lock, flags);
+ pm_runtime_mark_last_busy(up->dev);
+ pm_runtime_put_autosuspend(up->dev);
+}
+
+static int
+serial_omap_ioctl(struct uart_port *port, unsigned int cmd, unsigned long arg)
+{
+ struct serial_rs485 rs485conf;
+
+ switch (cmd) {
+ case TIOCSRS485:
+ if (copy_from_user(&rs485conf, (struct serial_rs485 *) arg,
+ sizeof(rs485conf)))
+ return -EFAULT;
+
+ serial_omap_config_rs485(port, &rs485conf);
+ break;
+
+ case TIOCGRS485:
+ if (copy_to_user((struct serial_rs485 *) arg,
+ &(to_uart_omap_port(port)->rs485),
+ sizeof(rs485conf)))
+ return -EFAULT;
+ break;
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+
static struct uart_ops serial_omap_pops = {
.tx_empty = serial_omap_tx_empty,
.set_mctrl = serial_omap_set_mctrl,
@@ -1275,6 +1407,7 @@ static struct uart_ops serial_omap_pops = {
.request_port = serial_omap_request_port,
.config_port = serial_omap_config_port,
.verify_port = serial_omap_verify_port,
+ .ioctl = serial_omap_ioctl,
#ifdef CONFIG_CONSOLE_POLL
.poll_put_char = serial_omap_poll_put_char,
.poll_get_char = serial_omap_poll_get_char,
@@ -1334,7 +1467,7 @@ static void omap_serial_fill_features_erratas(struct uart_omap_port *up)
u32 mvr, scheme;
u16 revision, major, minor;
- mvr = serial_in(up, UART_OMAP_MVER);
+ mvr = readl(up->port.membase + (UART_OMAP_MVER << up->port.regshift));
/* Check revision register scheme */
scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT;
@@ -1373,9 +1506,11 @@ static void omap_serial_fill_features_erratas(struct uart_omap_port *up)
case OMAP_UART_REV_52:
up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
UART_ERRATA_i291_DMA_FORCEIDLE);
+ up->features |= OMAP_UART_WER_HAS_TX_WAKEUP;
break;
case OMAP_UART_REV_63:
up->errata |= UART_ERRATA_i202_MDR1_ACCESS;
+ up->features |= OMAP_UART_WER_HAS_TX_WAKEUP;
break;
default:
break;
@@ -1395,15 +1530,64 @@ static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev)
return omap_up_info;
}
+static int serial_omap_probe_rs485(struct uart_omap_port *up,
+ struct device_node *np)
+{
+ struct serial_rs485 *rs485conf = &up->rs485;
+ u32 rs485_delay[2];
+ enum of_gpio_flags flags;
+ int ret;
+
+ rs485conf->flags = 0;
+ up->rts_gpio = -EINVAL;
+
+ if (!np)
+ return 0;
+
+ if (of_property_read_bool(np, "rs485-rts-active-high"))
+ rs485conf->flags |= SER_RS485_RTS_ON_SEND;
+ else
+ rs485conf->flags |= SER_RS485_RTS_AFTER_SEND;
+
+ /* check for tx enable gpio */
+ up->rts_gpio = of_get_named_gpio_flags(np, "rts-gpio", 0, &flags);
+ if (gpio_is_valid(up->rts_gpio)) {
+ ret = gpio_request(up->rts_gpio, "omap-serial");
+ if (ret < 0)
+ return ret;
+ ret = gpio_direction_output(up->rts_gpio,
+ flags & SER_RS485_RTS_AFTER_SEND);
+ if (ret < 0)
+ return ret;
+ } else
+ up->rts_gpio = -EINVAL;
+
+ if (of_property_read_u32_array(np, "rs485-rts-delay",
+ rs485_delay, 2) == 0) {
+ rs485conf->delay_rts_before_send = rs485_delay[0];
+ rs485conf->delay_rts_after_send = rs485_delay[1];
+ }
+
+ if (of_property_read_bool(np, "rs485-rx-during-tx"))
+ rs485conf->flags |= SER_RS485_RX_DURING_TX;
+
+ if (of_property_read_bool(np, "linux,rs485-enabled-at-boot-time"))
+ rs485conf->flags |= SER_RS485_ENABLED;
+
+ return 0;
+}
+
static int serial_omap_probe(struct platform_device *pdev)
{
struct uart_omap_port *up;
struct resource *mem, *irq;
- struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data;
+ struct omap_uart_port_info *omap_up_info = dev_get_platdata(&pdev->dev);
int ret;
- if (pdev->dev.of_node)
+ if (pdev->dev.of_node) {
omap_up_info = of_get_uart_port_info(&pdev->dev);
+ pdev->dev.platform_data = omap_up_info;
+ }
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem) {
@@ -1468,12 +1652,9 @@ static int serial_omap_probe(struct platform_device *pdev)
goto err_port_line;
}
- up->pins = devm_pinctrl_get_select_default(&pdev->dev);
- if (IS_ERR(up->pins)) {
- dev_warn(&pdev->dev, "did not get pins for uart%i error: %li\n",
- up->port.line, PTR_ERR(up->pins));
- up->pins = NULL;
- }
+ ret = serial_omap_probe_rs485(up, pdev->dev.of_node);
+ if (ret < 0)
+ goto err_rs485;
sprintf(up->name, "OMAP UART%d", up->port.line);
up->port.mapbase = mem->start;
@@ -1501,7 +1682,6 @@ static int serial_omap_probe(struct platform_device *pdev)
INIT_WORK(&up->qos_work, serial_omap_uart_qos_work);
platform_set_drvdata(pdev, up);
- pm_runtime_enable(&pdev->dev);
if (omap_up_info->autosuspend_timeout == 0)
omap_up_info->autosuspend_timeout = -1;
device_init_wakeup(up->dev, true);
@@ -1510,6 +1690,8 @@ static int serial_omap_probe(struct platform_device *pdev)
omap_up_info->autosuspend_timeout);
pm_runtime_irq_safe(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+
pm_runtime_get_sync(&pdev->dev);
omap_serial_fill_features_erratas(up);
@@ -1529,6 +1711,7 @@ err_add_port:
pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);
err_ioremap:
+err_rs485:
err_port_line:
dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n",
pdev->id, __func__, ret);
@@ -1609,6 +1792,7 @@ static void serial_omap_restore_context(struct uart_omap_port *up)
serial_omap_mdr1_errataset(up, up->mdr1);
else
serial_out(up, UART_OMAP_MDR1, up->mdr1);
+ serial_out(up, UART_OMAP_WER, up->wer);
}
static int serial_omap_runtime_suspend(struct device *dev)
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index 572d481..52379e5 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -232,7 +232,7 @@ struct eg20t_port {
unsigned int iobase;
struct pci_dev *pdev;
int fifo_size;
- int uartclk;
+ unsigned int uartclk;
int start_tx;
int start_rx;
int tx_empty;
@@ -373,35 +373,62 @@ static const struct file_operations port_regs_ops = {
};
#endif /* CONFIG_DEBUG_FS */
+static struct dmi_system_id pch_uart_dmi_table[] = {
+ {
+ .ident = "CM-iTC",
+ {
+ DMI_MATCH(DMI_BOARD_NAME, "CM-iTC"),
+ },
+ (void *)CMITC_UARTCLK,
+ },
+ {
+ .ident = "FRI2",
+ {
+ DMI_MATCH(DMI_BIOS_VERSION, "FRI2"),
+ },
+ (void *)FRI2_64_UARTCLK,
+ },
+ {
+ .ident = "Fish River Island II",
+ {
+ DMI_MATCH(DMI_PRODUCT_NAME, "Fish River Island II"),
+ },
+ (void *)FRI2_48_UARTCLK,
+ },
+ {
+ .ident = "COMe-mTT",
+ {
+ DMI_MATCH(DMI_BOARD_NAME, "COMe-mTT"),
+ },
+ (void *)NTC1_UARTCLK,
+ },
+ {
+ .ident = "nanoETXexpress-TT",
+ {
+ DMI_MATCH(DMI_BOARD_NAME, "nanoETXexpress-TT"),
+ },
+ (void *)NTC1_UARTCLK,
+ },
+ {
+ .ident = "MinnowBoard",
+ {
+ DMI_MATCH(DMI_BOARD_NAME, "MinnowBoard"),
+ },
+ (void *)MINNOW_UARTCLK,
+ },
+};
+
/* Return UART clock, checking for board specific clocks. */
-static int pch_uart_get_uartclk(void)
+static unsigned int pch_uart_get_uartclk(void)
{
- const char *cmp;
+ const struct dmi_system_id *d;
if (user_uartclk)
return user_uartclk;
- cmp = dmi_get_system_info(DMI_BOARD_NAME);
- if (cmp && strstr(cmp, "CM-iTC"))
- return CMITC_UARTCLK;
-
- cmp = dmi_get_system_info(DMI_BIOS_VERSION);
- if (cmp && strnstr(cmp, "FRI2", 4))
- return FRI2_64_UARTCLK;
-
- cmp = dmi_get_system_info(DMI_PRODUCT_NAME);
- if (cmp && strstr(cmp, "Fish River Island II"))
- return FRI2_48_UARTCLK;
-
- /* Kontron COMe-mTT10 (nanoETXexpress-TT) */
- cmp = dmi_get_system_info(DMI_BOARD_NAME);
- if (cmp && (strstr(cmp, "COMe-mTT") ||
- strstr(cmp, "nanoETXexpress-TT")))
- return NTC1_UARTCLK;
-
- cmp = dmi_get_system_info(DMI_BOARD_NAME);
- if (cmp && strstr(cmp, "MinnowBoard"))
- return MINNOW_UARTCLK;
+ d = dmi_first_match(pch_uart_dmi_table);
+ if (d)
+ return (unsigned long)d->driver_data;
return DEFAULT_UARTCLK;
}
@@ -422,7 +449,7 @@ static void pch_uart_hal_disable_interrupt(struct eg20t_port *priv,
iowrite8(ier, priv->membase + UART_IER);
}
-static int pch_uart_hal_set_line(struct eg20t_port *priv, int baud,
+static int pch_uart_hal_set_line(struct eg20t_port *priv, unsigned int baud,
unsigned int parity, unsigned int bits,
unsigned int stb)
{
@@ -457,7 +484,7 @@ static int pch_uart_hal_set_line(struct eg20t_port *priv, int baud,
lcr |= bits;
lcr |= stb;
- dev_dbg(priv->port.dev, "%s:baud = %d, div = %04x, lcr = %02x (%lu)\n",
+ dev_dbg(priv->port.dev, "%s:baud = %u, div = %04x, lcr = %02x (%lu)\n",
__func__, baud, div, lcr, jiffies);
iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR);
iowrite8(dll, priv->membase + PCH_UART_DLL);
@@ -1363,9 +1390,8 @@ static void pch_uart_shutdown(struct uart_port *port)
static void pch_uart_set_termios(struct uart_port *port,
struct ktermios *termios, struct ktermios *old)
{
- int baud;
int rtn;
- unsigned int parity, bits, stb;
+ unsigned int baud, parity, bits, stb;
struct eg20t_port *priv;
unsigned long flags;
@@ -1498,6 +1524,7 @@ static int pch_uart_verify_port(struct uart_port *port,
return 0;
}
+#if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_PCH_UART_CONSOLE)
/*
* Wait for transmitter & holding register to empty
*/
@@ -1528,6 +1555,7 @@ static void wait_for_xmitr(struct eg20t_port *up, int bits)
}
}
}
+#endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_PCH_UART_CONSOLE */
#ifdef CONFIG_CONSOLE_POLL
/*
diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c
index b1785f5..f87f1a0 100644
--- a/drivers/tty/serial/pmac_zilog.c
+++ b/drivers/tty/serial/pmac_zilog.c
@@ -1798,7 +1798,6 @@ static int __exit pmz_detach(struct platform_device *pdev)
uart_remove_one_port(&pmz_uart_reg, &uap->port);
- platform_set_drvdata(pdev, NULL);
uap->port.dev = NULL;
return 0;
diff --git a/drivers/tty/serial/pnx8xxx_uart.c b/drivers/tty/serial/pnx8xxx_uart.c
index 7e277a5..de6c05c 100644
--- a/drivers/tty/serial/pnx8xxx_uart.c
+++ b/drivers/tty/serial/pnx8xxx_uart.c
@@ -237,7 +237,10 @@ static void pnx8xxx_rx_chars(struct pnx8xxx_port *sport)
status = FIFO_TO_SM(serial_in(sport, PNX8XXX_FIFO)) |
ISTAT_TO_SM(serial_in(sport, PNX8XXX_ISTAT));
}
+
+ spin_unlock(&sport->port.lock);
tty_flip_buffer_push(&sport->port.state->port);
+ spin_lock(&sport->port.lock);
}
static void pnx8xxx_tx_chars(struct pnx8xxx_port *sport)
@@ -801,8 +804,6 @@ static int pnx8xxx_serial_remove(struct platform_device *pdev)
{
struct pnx8xxx_port *sport = platform_get_drvdata(pdev);
- platform_set_drvdata(pdev, NULL);
-
if (sport)
uart_remove_one_port(&pnx8xxx_reg, &sport->port);
diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c
index 05f504e..f9f20f3 100644
--- a/drivers/tty/serial/pxa.c
+++ b/drivers/tty/serial/pxa.c
@@ -332,31 +332,6 @@ static void serial_pxa_break_ctl(struct uart_port *port, int break_state)
spin_unlock_irqrestore(&up->port.lock, flags);
}
-#if 0
-static void serial_pxa_dma_init(struct pxa_uart *up)
-{
- up->rxdma =
- pxa_request_dma(up->name, DMA_PRIO_LOW, pxa_receive_dma, up);
- if (up->rxdma < 0)
- goto out;
- up->txdma =
- pxa_request_dma(up->name, DMA_PRIO_LOW, pxa_transmit_dma, up);
- if (up->txdma < 0)
- goto err_txdma;
- up->dmadesc = kmalloc(4 * sizeof(pxa_dma_desc), GFP_KERNEL);
- if (!up->dmadesc)
- goto err_alloc;
-
- /* ... */
-err_alloc:
- pxa_free_dma(up->txdma);
-err_rxdma:
- pxa_free_dma(up->rxdma);
-out:
- return;
-}
-#endif
-
static int serial_pxa_startup(struct uart_port *port)
{
struct uart_pxa_port *up = (struct uart_pxa_port *)port;
@@ -790,7 +765,7 @@ static struct console serial_pxa_console = {
#define PXA_CONSOLE NULL
#endif
-struct uart_ops serial_pxa_pops = {
+static struct uart_ops serial_pxa_pops = {
.tx_empty = serial_pxa_tx_empty,
.set_mctrl = serial_pxa_set_mctrl,
.get_mctrl = serial_pxa_get_mctrl,
@@ -945,8 +920,6 @@ static int serial_pxa_remove(struct platform_device *dev)
{
struct uart_pxa_port *sport = platform_get_drvdata(dev);
- platform_set_drvdata(dev, NULL);
-
uart_remove_one_port(&serial_pxa_reg, &sport->port);
clk_unprepare(sport->clk);
@@ -970,7 +943,7 @@ static struct platform_driver serial_pxa_driver = {
},
};
-int __init serial_pxa_init(void)
+static int __init serial_pxa_init(void)
{
int ret;
@@ -985,7 +958,7 @@ int __init serial_pxa_init(void)
return ret;
}
-void __exit serial_pxa_exit(void)
+static void __exit serial_pxa_exit(void)
{
platform_driver_unregister(&serial_pxa_driver);
uart_unregister_driver(&serial_pxa_reg);
diff --git a/drivers/tty/serial/rp2.c b/drivers/tty/serial/rp2.c
index a314a94..328d6de 100644
--- a/drivers/tty/serial/rp2.c
+++ b/drivers/tty/serial/rp2.c
@@ -427,7 +427,9 @@ static void rp2_rx_chars(struct rp2_uart_port *up)
up->port.icount.rx++;
}
+ spin_unlock(&up->port.lock);
tty_flip_buffer_push(port);
+ spin_lock(&up->port.lock);
}
static void rp2_tx_chars(struct rp2_uart_port *up)
diff --git a/drivers/tty/serial/sa1100.c b/drivers/tty/serial/sa1100.c
index af6b3e3..ba25722 100644
--- a/drivers/tty/serial/sa1100.c
+++ b/drivers/tty/serial/sa1100.c
@@ -232,7 +232,10 @@ sa1100_rx_chars(struct sa1100_port *sport)
status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
UTSR0_TO_SM(UART_GET_UTSR0(sport));
}
+
+ spin_unlock(&sport->port.lock);
tty_flip_buffer_push(&sport->port.state->port);
+ spin_lock(&sport->port.lock);
}
static void sa1100_tx_chars(struct sa1100_port *sport)
@@ -864,8 +867,6 @@ static int sa1100_serial_remove(struct platform_device *pdev)
{
struct sa1100_port *sport = platform_get_drvdata(pdev);
- platform_set_drvdata(pdev, NULL);
-
if (sport)
uart_remove_one_port(&sa1100_reg, &sport->port);
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 376079b..f3dfa19 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -249,6 +249,8 @@ s3c24xx_serial_rx_chars(int irq, void *dev_id)
ufcon |= S3C2410_UFCON_RESETRX;
wr_regl(port, S3C2410_UFCON, ufcon);
rx_enabled(port) = 1;
+ spin_unlock_irqrestore(&port->lock,
+ flags);
goto out;
}
continue;
@@ -297,10 +299,11 @@ s3c24xx_serial_rx_chars(int irq, void *dev_id)
ignore_char:
continue;
}
+
+ spin_unlock_irqrestore(&port->lock, flags);
tty_flip_buffer_push(&port->state->port);
out:
- spin_unlock_irqrestore(&port->lock, flags);
return IRQ_HANDLED;
}
@@ -1250,8 +1253,8 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
ourport->baudclk = ERR_PTR(-EINVAL);
ourport->info = ourport->drv_data->info;
- ourport->cfg = (pdev->dev.platform_data) ?
- (struct s3c2410_uartcfg *)pdev->dev.platform_data :
+ ourport->cfg = (dev_get_platdata(&pdev->dev)) ?
+ (struct s3c2410_uartcfg *)dev_get_platdata(&pdev->dev) :
ourport->drv_data->def_cfg;
ourport->port.fifosize = (ourport->info->fifosize) ?
diff --git a/drivers/tty/serial/samsung.h b/drivers/tty/serial/samsung.h
index 00a499e..aaa617a 100644
--- a/drivers/tty/serial/samsung.h
+++ b/drivers/tty/serial/samsung.h
@@ -68,7 +68,8 @@ struct s3c24xx_uart_port {
/* register access controls */
#define portaddr(port, reg) ((port)->membase + (reg))
-#define portaddrl(port, reg) ((unsigned long *)((port)->membase + (reg)))
+#define portaddrl(port, reg) \
+ ((unsigned long *)(unsigned long)((port)->membase + (reg)))
#define rd_regb(port, reg) (__raw_readb(portaddr(port, reg)))
#define rd_regl(port, reg) (__raw_readl(portaddr(port, reg)))
diff --git a/drivers/tty/serial/sc26xx.c b/drivers/tty/serial/sc26xx.c
index 4b1434d..887b4f7 100644
--- a/drivers/tty/serial/sc26xx.c
+++ b/drivers/tty/serial/sc26xx.c
@@ -637,7 +637,7 @@ static int sc26xx_probe(struct platform_device *dev)
{
struct resource *res;
struct uart_sc26xx_port *up;
- unsigned int *sc26xx_data = dev->dev.platform_data;
+ unsigned int *sc26xx_data = dev_get_platdata(&dev->dev);
int err;
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
diff --git a/drivers/tty/serial/sccnxp.c b/drivers/tty/serial/sccnxp.c
index c773041..49e9bbf 100644
--- a/drivers/tty/serial/sccnxp.c
+++ b/drivers/tty/serial/sccnxp.c
@@ -15,6 +15,7 @@
#define SUPPORT_SYSRQ
#endif
+#include <linux/clk.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/device.h>
@@ -94,16 +95,17 @@
#define MCTRL_IBIT(cfg, sig) ((((cfg) >> (sig)) & 0xf) - LINE_IP0)
#define MCTRL_OBIT(cfg, sig) ((((cfg) >> (sig)) & 0xf) - LINE_OP0)
-/* Supported chip types */
-enum {
- SCCNXP_TYPE_SC2681 = 2681,
- SCCNXP_TYPE_SC2691 = 2691,
- SCCNXP_TYPE_SC2692 = 2692,
- SCCNXP_TYPE_SC2891 = 2891,
- SCCNXP_TYPE_SC2892 = 2892,
- SCCNXP_TYPE_SC28202 = 28202,
- SCCNXP_TYPE_SC68681 = 68681,
- SCCNXP_TYPE_SC68692 = 68692,
+#define SCCNXP_HAVE_IO 0x00000001
+#define SCCNXP_HAVE_MR0 0x00000002
+
+struct sccnxp_chip {
+ const char *name;
+ unsigned int nr;
+ unsigned long freq_min;
+ unsigned long freq_std;
+ unsigned long freq_max;
+ unsigned int flags;
+ unsigned int fifosize;
};
struct sccnxp_port {
@@ -111,16 +113,10 @@ struct sccnxp_port {
struct uart_port port[SCCNXP_MAX_UARTS];
bool opened[SCCNXP_MAX_UARTS];
- const char *name;
int irq;
-
u8 imr;
- u8 addr_mask;
- int freq_std;
- int flags;
-#define SCCNXP_HAVE_IO 0x00000001
-#define SCCNXP_HAVE_MR0 0x00000002
+ struct sccnxp_chip *chip;
#ifdef CONFIG_SERIAL_SCCNXP_CONSOLE
struct console console;
@@ -136,29 +132,94 @@ struct sccnxp_port {
struct regulator *regulator;
};
-static inline u8 sccnxp_raw_read(void __iomem *base, u8 reg, u8 shift)
-{
- return readb(base + (reg << shift));
-}
+static const struct sccnxp_chip sc2681 = {
+ .name = "SC2681",
+ .nr = 2,
+ .freq_min = 1000000,
+ .freq_std = 3686400,
+ .freq_max = 4000000,
+ .flags = SCCNXP_HAVE_IO,
+ .fifosize = 3,
+};
-static inline void sccnxp_raw_write(void __iomem *base, u8 reg, u8 shift, u8 v)
-{
- writeb(v, base + (reg << shift));
-}
+static const struct sccnxp_chip sc2691 = {
+ .name = "SC2691",
+ .nr = 1,
+ .freq_min = 1000000,
+ .freq_std = 3686400,
+ .freq_max = 4000000,
+ .flags = 0,
+ .fifosize = 3,
+};
+
+static const struct sccnxp_chip sc2692 = {
+ .name = "SC2692",
+ .nr = 2,
+ .freq_min = 1000000,
+ .freq_std = 3686400,
+ .freq_max = 4000000,
+ .flags = SCCNXP_HAVE_IO,
+ .fifosize = 3,
+};
+
+static const struct sccnxp_chip sc2891 = {
+ .name = "SC2891",
+ .nr = 1,
+ .freq_min = 100000,
+ .freq_std = 3686400,
+ .freq_max = 8000000,
+ .flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0,
+ .fifosize = 16,
+};
+
+static const struct sccnxp_chip sc2892 = {
+ .name = "SC2892",
+ .nr = 2,
+ .freq_min = 100000,
+ .freq_std = 3686400,
+ .freq_max = 8000000,
+ .flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0,
+ .fifosize = 16,
+};
+
+static const struct sccnxp_chip sc28202 = {
+ .name = "SC28202",
+ .nr = 2,
+ .freq_min = 1000000,
+ .freq_std = 14745600,
+ .freq_max = 50000000,
+ .flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0,
+ .fifosize = 256,
+};
+
+static const struct sccnxp_chip sc68681 = {
+ .name = "SC68681",
+ .nr = 2,
+ .freq_min = 1000000,
+ .freq_std = 3686400,
+ .freq_max = 4000000,
+ .flags = SCCNXP_HAVE_IO,
+ .fifosize = 3,
+};
+
+static const struct sccnxp_chip sc68692 = {
+ .name = "SC68692",
+ .nr = 2,
+ .freq_min = 1000000,
+ .freq_std = 3686400,
+ .freq_max = 4000000,
+ .flags = SCCNXP_HAVE_IO,
+ .fifosize = 3,
+};
static inline u8 sccnxp_read(struct uart_port *port, u8 reg)
{
- struct sccnxp_port *s = dev_get_drvdata(port->dev);
-
- return sccnxp_raw_read(port->membase, reg & s->addr_mask,
- port->regshift);
+ return readb(port->membase + (reg << port->regshift));
}
static inline void sccnxp_write(struct uart_port *port, u8 reg, u8 v)
{
- struct sccnxp_port *s = dev_get_drvdata(port->dev);
-
- sccnxp_raw_write(port->membase, reg & s->addr_mask, port->regshift, v);
+ writeb(v, port->membase + (reg << port->regshift));
}
static inline u8 sccnxp_port_read(struct uart_port *port, u8 reg)
@@ -224,13 +285,14 @@ static int sccnxp_set_baud(struct uart_port *port, int baud)
{
struct sccnxp_port *s = dev_get_drvdata(port->dev);
int div_std, tmp_baud, bestbaud = baud, besterr = -1;
+ struct sccnxp_chip *chip = s->chip;
u8 i, acr = 0, csr = 0, mr0 = 0;
/* Find best baud from table */
for (i = 0; baud_std[i].baud && besterr; i++) {
- if (baud_std[i].mr0 && !(s->flags & SCCNXP_HAVE_MR0))
+ if (baud_std[i].mr0 && !(chip->flags & SCCNXP_HAVE_MR0))
continue;
- div_std = DIV_ROUND_CLOSEST(s->freq_std, baud_std[i].baud);
+ div_std = DIV_ROUND_CLOSEST(chip->freq_std, baud_std[i].baud);
tmp_baud = DIV_ROUND_CLOSEST(port->uartclk, div_std);
if (!sccnxp_update_best_err(baud, tmp_baud, &besterr)) {
acr = baud_std[i].acr;
@@ -240,7 +302,7 @@ static int sccnxp_set_baud(struct uart_port *port, int baud)
}
}
- if (s->flags & SCCNXP_HAVE_MR0) {
+ if (chip->flags & SCCNXP_HAVE_MR0) {
/* Enable FIFO, set half level for TX */
mr0 |= MR0_FIFO | MR0_TXLVL;
/* Update MR0 */
@@ -363,7 +425,7 @@ static void sccnxp_handle_tx(struct uart_port *port)
sccnxp_disable_irq(port, IMR_TXRDY);
/* Set direction to input */
- if (s->flags & SCCNXP_HAVE_IO)
+ if (s->chip->flags & SCCNXP_HAVE_IO)
sccnxp_set_bit(port, DIR_OP, 0);
}
return;
@@ -437,7 +499,7 @@ static void sccnxp_start_tx(struct uart_port *port)
spin_lock_irqsave(&s->lock, flags);
/* Set direction to output */
- if (s->flags & SCCNXP_HAVE_IO)
+ if (s->chip->flags & SCCNXP_HAVE_IO)
sccnxp_set_bit(port, DIR_OP, 1);
sccnxp_enable_irq(port, IMR_TXRDY);
@@ -483,7 +545,7 @@ static void sccnxp_set_mctrl(struct uart_port *port, unsigned int mctrl)
struct sccnxp_port *s = dev_get_drvdata(port->dev);
unsigned long flags;
- if (!(s->flags & SCCNXP_HAVE_IO))
+ if (!(s->chip->flags & SCCNXP_HAVE_IO))
return;
spin_lock_irqsave(&s->lock, flags);
@@ -501,7 +563,7 @@ static unsigned int sccnxp_get_mctrl(struct uart_port *port)
struct sccnxp_port *s = dev_get_drvdata(port->dev);
unsigned int mctrl = TIOCM_DSR | TIOCM_CTS | TIOCM_CAR;
- if (!(s->flags & SCCNXP_HAVE_IO))
+ if (!(s->chip->flags & SCCNXP_HAVE_IO))
return mctrl;
spin_lock_irqsave(&s->lock, flags);
@@ -617,7 +679,7 @@ static void sccnxp_set_termios(struct uart_port *port,
/* Setup baudrate */
baud = uart_get_baud_rate(port, termios, old, 50,
- (s->flags & SCCNXP_HAVE_MR0) ?
+ (s->chip->flags & SCCNXP_HAVE_MR0) ?
230400 : 38400);
baud = sccnxp_set_baud(port, baud);
@@ -641,7 +703,7 @@ static int sccnxp_startup(struct uart_port *port)
spin_lock_irqsave(&s->lock, flags);
- if (s->flags & SCCNXP_HAVE_IO) {
+ if (s->chip->flags & SCCNXP_HAVE_IO) {
/* Outputs are controlled manually */
sccnxp_write(port, SCCNXP_OPCR_REG, 0);
}
@@ -681,7 +743,7 @@ static void sccnxp_shutdown(struct uart_port *port)
sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_DISABLE | CR_TX_DISABLE);
/* Leave direction to input */
- if (s->flags & SCCNXP_HAVE_IO)
+ if (s->chip->flags & SCCNXP_HAVE_IO)
sccnxp_set_bit(port, DIR_OP, 0);
spin_unlock_irqrestore(&s->lock, flags);
@@ -691,7 +753,7 @@ static const char *sccnxp_type(struct uart_port *port)
{
struct sccnxp_port *s = dev_get_drvdata(port->dev);
- return (port->type == PORT_SC26XX) ? s->name : NULL;
+ return (port->type == PORT_SC26XX) ? s->chip->name : NULL;
}
static void sccnxp_release_port(struct uart_port *port)
@@ -778,19 +840,31 @@ static int sccnxp_console_setup(struct console *co, char *options)
}
#endif
+static const struct platform_device_id sccnxp_id_table[] = {
+ { .name = "sc2681", .driver_data = (kernel_ulong_t)&sc2681, },
+ { .name = "sc2691", .driver_data = (kernel_ulong_t)&sc2691, },
+ { .name = "sc2692", .driver_data = (kernel_ulong_t)&sc2692, },
+ { .name = "sc2891", .driver_data = (kernel_ulong_t)&sc2891, },
+ { .name = "sc2892", .driver_data = (kernel_ulong_t)&sc2892, },
+ { .name = "sc28202", .driver_data = (kernel_ulong_t)&sc28202, },
+ { .name = "sc68681", .driver_data = (kernel_ulong_t)&sc68681, },
+ { .name = "sc68692", .driver_data = (kernel_ulong_t)&sc68692, },
+ { }
+};
+MODULE_DEVICE_TABLE(platform, sccnxp_id_table);
+
static int sccnxp_probe(struct platform_device *pdev)
{
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- int chiptype = pdev->id_entry->driver_data;
struct sccnxp_pdata *pdata = dev_get_platdata(&pdev->dev);
- int i, ret, fifosize, freq_min, freq_max;
+ int i, ret, uartclk;
struct sccnxp_port *s;
void __iomem *membase;
+ struct clk *clk;
- if (!res) {
- dev_err(&pdev->dev, "Missing memory resource data\n");
- return -EADDRNOTAVAIL;
- }
+ membase = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(membase))
+ return PTR_ERR(membase);
s = devm_kzalloc(&pdev->dev, sizeof(struct sccnxp_port), GFP_KERNEL);
if (!s) {
@@ -801,99 +875,38 @@ static int sccnxp_probe(struct platform_device *pdev)
spin_lock_init(&s->lock);
- /* Individual chip settings */
- switch (chiptype) {
- case SCCNXP_TYPE_SC2681:
- s->name = "SC2681";
- s->uart.nr = 2;
- s->freq_std = 3686400;
- s->addr_mask = 0x0f;
- s->flags = SCCNXP_HAVE_IO;
- fifosize = 3;
- freq_min = 1000000;
- freq_max = 4000000;
- break;
- case SCCNXP_TYPE_SC2691:
- s->name = "SC2691";
- s->uart.nr = 1;
- s->freq_std = 3686400;
- s->addr_mask = 0x07;
- s->flags = 0;
- fifosize = 3;
- freq_min = 1000000;
- freq_max = 4000000;
- break;
- case SCCNXP_TYPE_SC2692:
- s->name = "SC2692";
- s->uart.nr = 2;
- s->freq_std = 3686400;
- s->addr_mask = 0x0f;
- s->flags = SCCNXP_HAVE_IO;
- fifosize = 3;
- freq_min = 1000000;
- freq_max = 4000000;
- break;
- case SCCNXP_TYPE_SC2891:
- s->name = "SC2891";
- s->uart.nr = 1;
- s->freq_std = 3686400;
- s->addr_mask = 0x0f;
- s->flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0;
- fifosize = 16;
- freq_min = 100000;
- freq_max = 8000000;
- break;
- case SCCNXP_TYPE_SC2892:
- s->name = "SC2892";
- s->uart.nr = 2;
- s->freq_std = 3686400;
- s->addr_mask = 0x0f;
- s->flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0;
- fifosize = 16;
- freq_min = 100000;
- freq_max = 8000000;
- break;
- case SCCNXP_TYPE_SC28202:
- s->name = "SC28202";
- s->uart.nr = 2;
- s->freq_std = 14745600;
- s->addr_mask = 0x7f;
- s->flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0;
- fifosize = 256;
- freq_min = 1000000;
- freq_max = 50000000;
- break;
- case SCCNXP_TYPE_SC68681:
- s->name = "SC68681";
- s->uart.nr = 2;
- s->freq_std = 3686400;
- s->addr_mask = 0x0f;
- s->flags = SCCNXP_HAVE_IO;
- fifosize = 3;
- freq_min = 1000000;
- freq_max = 4000000;
- break;
- case SCCNXP_TYPE_SC68692:
- s->name = "SC68692";
- s->uart.nr = 2;
- s->freq_std = 3686400;
- s->addr_mask = 0x0f;
- s->flags = SCCNXP_HAVE_IO;
- fifosize = 3;
- freq_min = 1000000;
- freq_max = 4000000;
- break;
- default:
- dev_err(&pdev->dev, "Unsupported chip type %i\n", chiptype);
- ret = -ENOTSUPP;
+ s->chip = (struct sccnxp_chip *)pdev->id_entry->driver_data;
+
+ s->regulator = devm_regulator_get(&pdev->dev, "vcc");
+ if (!IS_ERR(s->regulator)) {
+ ret = regulator_enable(s->regulator);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "Failed to enable regulator: %i\n", ret);
+ return ret;
+ }
+ } else if (PTR_ERR(s->regulator) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(clk)) {
+ if (PTR_ERR(clk) == -EPROBE_DEFER) {
+ ret = -EPROBE_DEFER;
+ goto err_out;
+ }
+ dev_notice(&pdev->dev, "Using default clock frequency\n");
+ uartclk = s->chip->freq_std;
+ } else
+ uartclk = clk_get_rate(clk);
+
+ /* Check input frequency */
+ if ((uartclk < s->chip->freq_min) || (uartclk > s->chip->freq_max)) {
+ dev_err(&pdev->dev, "Frequency out of bounds\n");
+ ret = -EINVAL;
goto err_out;
}
- if (!pdata) {
- dev_warn(&pdev->dev,
- "No platform data supplied, using defaults\n");
- s->pdata.frequency = s->freq_std;
- } else
+ if (pdata)
memcpy(&s->pdata, pdata, sizeof(struct sccnxp_pdata));
if (s->pdata.poll_time_us) {
@@ -911,34 +924,11 @@ static int sccnxp_probe(struct platform_device *pdev)
}
}
- /* Check input frequency */
- if ((s->pdata.frequency < freq_min) ||
- (s->pdata.frequency > freq_max)) {
- dev_err(&pdev->dev, "Frequency out of bounds\n");
- ret = -EINVAL;
- goto err_out;
- }
-
- s->regulator = devm_regulator_get(&pdev->dev, "VCC");
- if (!IS_ERR(s->regulator)) {
- ret = regulator_enable(s->regulator);
- if (ret) {
- dev_err(&pdev->dev,
- "Failed to enable regulator: %i\n", ret);
- return ret;
- }
- }
-
- membase = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(membase)) {
- ret = PTR_ERR(membase);
- goto err_out;
- }
-
s->uart.owner = THIS_MODULE;
s->uart.dev_name = "ttySC";
s->uart.major = SCCNXP_MAJOR;
s->uart.minor = SCCNXP_MINOR;
+ s->uart.nr = s->chip->nr;
#ifdef CONFIG_SERIAL_SCCNXP_CONSOLE
s->uart.cons = &s->console;
s->uart.cons->device = uart_console_device;
@@ -960,17 +950,17 @@ static int sccnxp_probe(struct platform_device *pdev)
s->port[i].dev = &pdev->dev;
s->port[i].irq = s->irq;
s->port[i].type = PORT_SC26XX;
- s->port[i].fifosize = fifosize;
+ s->port[i].fifosize = s->chip->fifosize;
s->port[i].flags = UPF_SKIP_TEST | UPF_FIXED_TYPE;
s->port[i].iotype = UPIO_MEM;
s->port[i].mapbase = res->start;
s->port[i].membase = membase;
s->port[i].regshift = s->pdata.reg_shift;
- s->port[i].uartclk = s->pdata.frequency;
+ s->port[i].uartclk = uartclk;
s->port[i].ops = &sccnxp_ops;
uart_add_one_port(&s->uart, &s->port[i]);
/* Set direction to input */
- if (s->flags & SCCNXP_HAVE_IO)
+ if (s->chip->flags & SCCNXP_HAVE_IO)
sccnxp_set_bit(&s->port[i], DIR_OP, 0);
}
@@ -997,7 +987,8 @@ static int sccnxp_probe(struct platform_device *pdev)
}
err_out:
- platform_set_drvdata(pdev, NULL);
+ if (!IS_ERR(s->regulator))
+ return regulator_disable(s->regulator);
return ret;
}
@@ -1016,7 +1007,6 @@ static int sccnxp_remove(struct platform_device *pdev)
uart_remove_one_port(&s->uart, &s->port[i]);
uart_unregister_driver(&s->uart);
- platform_set_drvdata(pdev, NULL);
if (!IS_ERR(s->regulator))
return regulator_disable(s->regulator);
@@ -1024,19 +1014,6 @@ static int sccnxp_remove(struct platform_device *pdev)
return 0;
}
-static const struct platform_device_id sccnxp_id_table[] = {
- { "sc2681", SCCNXP_TYPE_SC2681 },
- { "sc2691", SCCNXP_TYPE_SC2691 },
- { "sc2692", SCCNXP_TYPE_SC2692 },
- { "sc2891", SCCNXP_TYPE_SC2891 },
- { "sc2892", SCCNXP_TYPE_SC2892 },
- { "sc28202", SCCNXP_TYPE_SC28202 },
- { "sc68681", SCCNXP_TYPE_SC68681 },
- { "sc68692", SCCNXP_TYPE_SC68692 },
- { },
-};
-MODULE_DEVICE_TABLE(platform, sccnxp_id_table);
-
static struct platform_driver sccnxp_uart_driver = {
.driver = {
.name = SCCNXP_NAME,
diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c
index ee7c812..d0d972f 100644
--- a/drivers/tty/serial/serial-tegra.c
+++ b/drivers/tty/serial/serial-tegra.c
@@ -571,7 +571,9 @@ static void tegra_uart_rx_dma_complete(void *args)
tegra_uart_handle_rx_pio(tup, port);
if (tty) {
+ spin_unlock_irqrestore(&u->lock, flags);
tty_flip_buffer_push(port);
+ spin_lock_irqsave(&u->lock, flags);
tty_kref_put(tty);
}
tegra_uart_start_rx_dma(tup);
@@ -583,11 +585,13 @@ static void tegra_uart_rx_dma_complete(void *args)
spin_unlock_irqrestore(&u->lock, flags);
}
-static void tegra_uart_handle_rx_dma(struct tegra_uart_port *tup)
+static void tegra_uart_handle_rx_dma(struct tegra_uart_port *tup,
+ unsigned long *flags)
{
struct dma_tx_state state;
struct tty_struct *tty = tty_port_tty_get(&tup->uport.state->port);
struct tty_port *port = &tup->uport.state->port;
+ struct uart_port *u = &tup->uport;
int count;
/* Deactivate flow control to stop sender */
@@ -604,7 +608,9 @@ static void tegra_uart_handle_rx_dma(struct tegra_uart_port *tup)
tegra_uart_handle_rx_pio(tup, port);
if (tty) {
+ spin_unlock_irqrestore(&u->lock, *flags);
tty_flip_buffer_push(port);
+ spin_lock_irqsave(&u->lock, *flags);
tty_kref_put(tty);
}
tegra_uart_start_rx_dma(tup);
@@ -671,7 +677,7 @@ static irqreturn_t tegra_uart_isr(int irq, void *data)
iir = tegra_uart_read(tup, UART_IIR);
if (iir & UART_IIR_NO_INT) {
if (is_rx_int) {
- tegra_uart_handle_rx_dma(tup);
+ tegra_uart_handle_rx_dma(tup, &flags);
if (tup->rx_in_progress) {
ier = tup->ier_shadow;
ier |= (UART_IER_RLSI | UART_IER_RTOIE |
@@ -1206,7 +1212,7 @@ static struct uart_driver tegra_uart_driver = {
.owner = THIS_MODULE,
.driver_name = "tegra_hsuart",
.dev_name = "ttyTHS",
- .cons = 0,
+ .cons = NULL,
.nr = TEGRA_UART_MAXIMUM,
};
@@ -1237,13 +1243,13 @@ static int tegra_uart_parse_dt(struct platform_device *pdev,
return 0;
}
-struct tegra_uart_chip_data tegra20_uart_chip_data = {
+static struct tegra_uart_chip_data tegra20_uart_chip_data = {
.tx_fifo_full_status = false,
.allow_txfifo_reset_fifo_mode = true,
.support_clk_src_div = false,
};
-struct tegra_uart_chip_data tegra30_uart_chip_data = {
+static struct tegra_uart_chip_data tegra30_uart_chip_data = {
.tx_fifo_full_status = true,
.allow_txfifo_reset_fifo_mode = false,
.support_clk_src_div = true,
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 28cdd28..0f02351 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -2095,12 +2095,12 @@ uart_report_port(struct uart_driver *drv, struct uart_port *port)
break;
}
- printk(KERN_INFO "%s%s%s%d at %s (irq = %d) is a %s\n",
+ printk(KERN_INFO "%s%s%s%d at %s (irq = %d, base_baud = %d) is a %s\n",
port->dev ? dev_name(port->dev) : "",
port->dev ? ": " : "",
drv->dev_name,
drv->tty_driver->name_base + port->line,
- address, port->irq, uart_type(port));
+ address, port->irq, port->uartclk / 16, uart_type(port));
}
static void
diff --git a/drivers/tty/serial/serial_txx9.c b/drivers/tty/serial/serial_txx9.c
index fe48a0c..440a962 100644
--- a/drivers/tty/serial/serial_txx9.c
+++ b/drivers/tty/serial/serial_txx9.c
@@ -1097,7 +1097,7 @@ static void serial_txx9_unregister_port(int line)
*/
static int serial_txx9_probe(struct platform_device *dev)
{
- struct uart_port *p = dev->dev.platform_data;
+ struct uart_port *p = dev_get_platdata(&dev->dev);
struct uart_port port;
int ret, i;
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 7477e0e..5377502 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -2380,7 +2380,7 @@ static char early_serial_buf[32];
static int sci_probe_earlyprintk(struct platform_device *pdev)
{
- struct plat_sci_port *cfg = pdev->dev.platform_data;
+ struct plat_sci_port *cfg = dev_get_platdata(&pdev->dev);
if (early_serial_console.data)
return -EEXIST;
@@ -2469,7 +2469,7 @@ static int sci_probe_single(struct platform_device *dev,
static int sci_probe(struct platform_device *dev)
{
- struct plat_sci_port *p = dev->dev.platform_data;
+ struct plat_sci_port *p = dev_get_platdata(&dev->dev);
struct sci_port *sp = &sci_ports[dev->id];
int ret;
diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c
index 1fd564b..61c1ad0 100644
--- a/drivers/tty/serial/sirfsoc_uart.c
+++ b/drivers/tty/serial/sirfsoc_uart.c
@@ -20,9 +20,13 @@
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/io.h>
+#include <linux/of_gpio.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-direction.h>
+#include <linux/dma-mapping.h>
+#include <linux/sirfsoc_dma.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>
-#include <linux/pinctrl/consumer.h>
#include "sirfsoc_uart.h"
@@ -32,6 +36,9 @@ static unsigned int
sirfsoc_uart_pio_rx_chars(struct uart_port *port, unsigned int max_rx_count);
static struct uart_driver sirfsoc_uart_drv;
+static void sirfsoc_uart_tx_dma_complete_callback(void *param);
+static void sirfsoc_uart_start_next_rx_dma(struct uart_port *port);
+static void sirfsoc_uart_rx_dma_complete_callback(void *param);
static const struct sirfsoc_baudrate_to_regv baudrate_to_regv[] = {
{4000000, 2359296},
{3500000, 1310721},
@@ -89,6 +96,13 @@ static struct sirfsoc_uart_port sirfsoc_uart_ports[SIRFSOC_UART_NR] = {
.line = 4,
},
},
+ [5] = {
+ .port = {
+ .iotype = UPIO_MEM,
+ .flags = UPF_BOOT_AUTOCONF,
+ .line = 5,
+ },
+ },
};
static inline struct sirfsoc_uart_port *to_sirfport(struct uart_port *port)
@@ -99,21 +113,28 @@ static inline struct sirfsoc_uart_port *to_sirfport(struct uart_port *port)
static inline unsigned int sirfsoc_uart_tx_empty(struct uart_port *port)
{
unsigned long reg;
- reg = rd_regl(port, SIRFUART_TX_FIFO_STATUS);
- if (reg & SIRFUART_FIFOEMPTY_MASK(port))
- return TIOCSER_TEMT;
- else
- return 0;
+ struct sirfsoc_uart_port *sirfport = to_sirfport(port);
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
+ struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status;
+ reg = rd_regl(port, ureg->sirfsoc_tx_fifo_status);
+
+ return (reg & ufifo_st->ff_empty(port->line)) ? TIOCSER_TEMT : 0;
}
static unsigned int sirfsoc_uart_get_mctrl(struct uart_port *port)
{
struct sirfsoc_uart_port *sirfport = to_sirfport(port);
- if (!(sirfport->ms_enabled)) {
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
+ if (!sirfport->hw_flow_ctrl || !sirfport->ms_enabled)
goto cts_asserted;
- } else if (sirfport->hw_flow_ctrl) {
- if (!(rd_regl(port, SIRFUART_AFC_CTRL) &
- SIRFUART_CTS_IN_STATUS))
+ if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
+ if (!(rd_regl(port, ureg->sirfsoc_afc_ctrl) &
+ SIRFUART_AFC_CTS_STATUS))
+ goto cts_asserted;
+ else
+ goto cts_deasserted;
+ } else {
+ if (!gpio_get_value(sirfport->cts_gpio))
goto cts_asserted;
else
goto cts_deasserted;
@@ -127,89 +148,276 @@ cts_asserted:
static void sirfsoc_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct sirfsoc_uart_port *sirfport = to_sirfport(port);
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
unsigned int assert = mctrl & TIOCM_RTS;
unsigned int val = assert ? SIRFUART_AFC_CTRL_RX_THD : 0x0;
unsigned int current_val;
- if (sirfport->hw_flow_ctrl) {
- current_val = rd_regl(port, SIRFUART_AFC_CTRL) & ~0xFF;
+
+ if (!sirfport->hw_flow_ctrl || !sirfport->ms_enabled)
+ return;
+ if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
+ current_val = rd_regl(port, ureg->sirfsoc_afc_ctrl) & ~0xFF;
val |= current_val;
- wr_regl(port, SIRFUART_AFC_CTRL, val);
+ wr_regl(port, ureg->sirfsoc_afc_ctrl, val);
+ } else {
+ if (!val)
+ gpio_set_value(sirfport->rts_gpio, 1);
+ else
+ gpio_set_value(sirfport->rts_gpio, 0);
}
}
static void sirfsoc_uart_stop_tx(struct uart_port *port)
{
- unsigned int regv;
- regv = rd_regl(port, SIRFUART_INT_EN);
- wr_regl(port, SIRFUART_INT_EN, regv & ~SIRFUART_TX_INT_EN);
+ struct sirfsoc_uart_port *sirfport = to_sirfport(port);
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
+ struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
+
+ if (IS_DMA_CHAN_VALID(sirfport->tx_dma_no)) {
+ if (sirfport->tx_dma_state == TX_DMA_RUNNING) {
+ dmaengine_pause(sirfport->tx_dma_chan);
+ sirfport->tx_dma_state = TX_DMA_PAUSE;
+ } else {
+ if (!sirfport->is_marco)
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ rd_regl(port, ureg->sirfsoc_int_en_reg) &
+ ~uint_en->sirfsoc_txfifo_empty_en);
+ else
+ wr_regl(port, SIRFUART_INT_EN_CLR,
+ uint_en->sirfsoc_txfifo_empty_en);
+ }
+ } else {
+ if (!sirfport->is_marco)
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ rd_regl(port, ureg->sirfsoc_int_en_reg) &
+ ~uint_en->sirfsoc_txfifo_empty_en);
+ else
+ wr_regl(port, SIRFUART_INT_EN_CLR,
+ uint_en->sirfsoc_txfifo_empty_en);
+ }
}
-void sirfsoc_uart_start_tx(struct uart_port *port)
+static void sirfsoc_uart_tx_with_dma(struct sirfsoc_uart_port *sirfport)
+{
+ struct uart_port *port = &sirfport->port;
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
+ struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
+ struct circ_buf *xmit = &port->state->xmit;
+ unsigned long tran_size;
+ unsigned long tran_start;
+ unsigned long pio_tx_size;
+
+ tran_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+ tran_start = (unsigned long)(xmit->buf + xmit->tail);
+ if (uart_circ_empty(xmit) || uart_tx_stopped(port) ||
+ !tran_size)
+ return;
+ if (sirfport->tx_dma_state == TX_DMA_PAUSE) {
+ dmaengine_resume(sirfport->tx_dma_chan);
+ return;
+ }
+ if (sirfport->tx_dma_state == TX_DMA_RUNNING)
+ return;
+ if (!sirfport->is_marco)
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ rd_regl(port, ureg->sirfsoc_int_en_reg)&
+ ~(uint_en->sirfsoc_txfifo_empty_en));
+ else
+ wr_regl(port, SIRFUART_INT_EN_CLR,
+ uint_en->sirfsoc_txfifo_empty_en);
+ /*
+ * DMA requires buffer address and buffer length are both aligned with
+ * 4 bytes, so we use PIO for
+ * 1. if address is not aligned with 4bytes, use PIO for the first 1~3
+ * bytes, and move to DMA for the left part aligned with 4bytes
+ * 2. if buffer length is not aligned with 4bytes, use DMA for aligned
+ * part first, move to PIO for the left 1~3 bytes
+ */
+ if (tran_size < 4 || BYTES_TO_ALIGN(tran_start)) {
+ wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_STOP);
+ wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl,
+ rd_regl(port, ureg->sirfsoc_tx_dma_io_ctrl)|
+ SIRFUART_IO_MODE);
+ if (BYTES_TO_ALIGN(tran_start)) {
+ pio_tx_size = sirfsoc_uart_pio_tx_chars(sirfport,
+ BYTES_TO_ALIGN(tran_start));
+ tran_size -= pio_tx_size;
+ }
+ if (tran_size < 4)
+ sirfsoc_uart_pio_tx_chars(sirfport, tran_size);
+ if (!sirfport->is_marco)
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ rd_regl(port, ureg->sirfsoc_int_en_reg)|
+ uint_en->sirfsoc_txfifo_empty_en);
+ else
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ uint_en->sirfsoc_txfifo_empty_en);
+ wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_START);
+ } else {
+ /* tx transfer mode switch into dma mode */
+ wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_STOP);
+ wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl,
+ rd_regl(port, ureg->sirfsoc_tx_dma_io_ctrl)&
+ ~SIRFUART_IO_MODE);
+ wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_START);
+ tran_size &= ~(0x3);
+
+ sirfport->tx_dma_addr = dma_map_single(port->dev,
+ xmit->buf + xmit->tail,
+ tran_size, DMA_TO_DEVICE);
+ sirfport->tx_dma_desc = dmaengine_prep_slave_single(
+ sirfport->tx_dma_chan, sirfport->tx_dma_addr,
+ tran_size, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
+ if (!sirfport->tx_dma_desc) {
+ dev_err(port->dev, "DMA prep slave single fail\n");
+ return;
+ }
+ sirfport->tx_dma_desc->callback =
+ sirfsoc_uart_tx_dma_complete_callback;
+ sirfport->tx_dma_desc->callback_param = (void *)sirfport;
+ sirfport->transfer_size = tran_size;
+
+ dmaengine_submit(sirfport->tx_dma_desc);
+ dma_async_issue_pending(sirfport->tx_dma_chan);
+ sirfport->tx_dma_state = TX_DMA_RUNNING;
+ }
+}
+
+static void sirfsoc_uart_start_tx(struct uart_port *port)
{
struct sirfsoc_uart_port *sirfport = to_sirfport(port);
- unsigned long regv;
- sirfsoc_uart_pio_tx_chars(sirfport, 1);
- wr_regl(port, SIRFUART_TX_FIFO_OP, SIRFUART_TX_FIFO_START);
- regv = rd_regl(port, SIRFUART_INT_EN);
- wr_regl(port, SIRFUART_INT_EN, regv | SIRFUART_TX_INT_EN);
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
+ struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
+ if (IS_DMA_CHAN_VALID(sirfport->tx_dma_no))
+ sirfsoc_uart_tx_with_dma(sirfport);
+ else {
+ sirfsoc_uart_pio_tx_chars(sirfport, 1);
+ wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_START);
+ if (!sirfport->is_marco)
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ rd_regl(port, ureg->sirfsoc_int_en_reg)|
+ uint_en->sirfsoc_txfifo_empty_en);
+ else
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ uint_en->sirfsoc_txfifo_empty_en);
+ }
}
static void sirfsoc_uart_stop_rx(struct uart_port *port)
{
- unsigned long regv;
- wr_regl(port, SIRFUART_RX_FIFO_OP, 0);
- regv = rd_regl(port, SIRFUART_INT_EN);
- wr_regl(port, SIRFUART_INT_EN, regv & ~SIRFUART_RX_IO_INT_EN);
+ struct sirfsoc_uart_port *sirfport = to_sirfport(port);
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
+ struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
+
+ wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0);
+ if (IS_DMA_CHAN_VALID(sirfport->rx_dma_no)) {
+ if (!sirfport->is_marco)
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ rd_regl(port, ureg->sirfsoc_int_en_reg) &
+ ~(SIRFUART_RX_DMA_INT_EN(port, uint_en) |
+ uint_en->sirfsoc_rx_done_en));
+ else
+ wr_regl(port, SIRFUART_INT_EN_CLR,
+ SIRFUART_RX_DMA_INT_EN(port, uint_en)|
+ uint_en->sirfsoc_rx_done_en);
+ dmaengine_terminate_all(sirfport->rx_dma_chan);
+ } else {
+ if (!sirfport->is_marco)
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ rd_regl(port, ureg->sirfsoc_int_en_reg)&
+ ~(SIRFUART_RX_IO_INT_EN(port, uint_en)));
+ else
+ wr_regl(port, SIRFUART_INT_EN_CLR,
+ SIRFUART_RX_IO_INT_EN(port, uint_en));
+ }
}
static void sirfsoc_uart_disable_ms(struct uart_port *port)
{
struct sirfsoc_uart_port *sirfport = to_sirfport(port);
- unsigned long reg;
- sirfport->ms_enabled = 0;
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
+ struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
+
if (!sirfport->hw_flow_ctrl)
return;
- reg = rd_regl(port, SIRFUART_AFC_CTRL);
- wr_regl(port, SIRFUART_AFC_CTRL, reg & ~0x3FF);
- reg = rd_regl(port, SIRFUART_INT_EN);
- wr_regl(port, SIRFUART_INT_EN, reg & ~SIRFUART_CTS_INT_EN);
+ sirfport->ms_enabled = false;
+ if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
+ wr_regl(port, ureg->sirfsoc_afc_ctrl,
+ rd_regl(port, ureg->sirfsoc_afc_ctrl) & ~0x3FF);
+ if (!sirfport->is_marco)
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ rd_regl(port, ureg->sirfsoc_int_en_reg)&
+ ~uint_en->sirfsoc_cts_en);
+ else
+ wr_regl(port, SIRFUART_INT_EN_CLR,
+ uint_en->sirfsoc_cts_en);
+ } else
+ disable_irq(gpio_to_irq(sirfport->cts_gpio));
+}
+
+static irqreturn_t sirfsoc_uart_usp_cts_handler(int irq, void *dev_id)
+{
+ struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)dev_id;
+ struct uart_port *port = &sirfport->port;
+ if (gpio_is_valid(sirfport->cts_gpio) && sirfport->ms_enabled)
+ uart_handle_cts_change(port,
+ !gpio_get_value(sirfport->cts_gpio));
+ return IRQ_HANDLED;
}
static void sirfsoc_uart_enable_ms(struct uart_port *port)
{
struct sirfsoc_uart_port *sirfport = to_sirfport(port);
- unsigned long reg;
- unsigned long flg;
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
+ struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
+
if (!sirfport->hw_flow_ctrl)
return;
- flg = SIRFUART_AFC_RX_EN | SIRFUART_AFC_TX_EN;
- reg = rd_regl(port, SIRFUART_AFC_CTRL);
- wr_regl(port, SIRFUART_AFC_CTRL, reg | flg);
- reg = rd_regl(port, SIRFUART_INT_EN);
- wr_regl(port, SIRFUART_INT_EN, reg | SIRFUART_CTS_INT_EN);
- uart_handle_cts_change(port,
- !(rd_regl(port, SIRFUART_AFC_CTRL) & SIRFUART_CTS_IN_STATUS));
- sirfport->ms_enabled = 1;
+ sirfport->ms_enabled = true;
+ if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
+ wr_regl(port, ureg->sirfsoc_afc_ctrl,
+ rd_regl(port, ureg->sirfsoc_afc_ctrl) |
+ SIRFUART_AFC_TX_EN | SIRFUART_AFC_RX_EN);
+ if (!sirfport->is_marco)
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ rd_regl(port, ureg->sirfsoc_int_en_reg)
+ | uint_en->sirfsoc_cts_en);
+ else
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ uint_en->sirfsoc_cts_en);
+ } else
+ enable_irq(gpio_to_irq(sirfport->cts_gpio));
}
static void sirfsoc_uart_break_ctl(struct uart_port *port, int break_state)
{
- unsigned long ulcon = rd_regl(port, SIRFUART_LINE_CTRL);
- if (break_state)
- ulcon |= SIRFUART_SET_BREAK;
- else
- ulcon &= ~SIRFUART_SET_BREAK;
- wr_regl(port, SIRFUART_LINE_CTRL, ulcon);
+ struct sirfsoc_uart_port *sirfport = to_sirfport(port);
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
+ if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
+ unsigned long ulcon = rd_regl(port, ureg->sirfsoc_line_ctrl);
+ if (break_state)
+ ulcon |= SIRFUART_SET_BREAK;
+ else
+ ulcon &= ~SIRFUART_SET_BREAK;
+ wr_regl(port, ureg->sirfsoc_line_ctrl, ulcon);
+ }
}
static unsigned int
sirfsoc_uart_pio_rx_chars(struct uart_port *port, unsigned int max_rx_count)
{
+ struct sirfsoc_uart_port *sirfport = to_sirfport(port);
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
+ struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status;
unsigned int ch, rx_count = 0;
-
- while (!(rd_regl(port, SIRFUART_RX_FIFO_STATUS) &
- SIRFUART_FIFOEMPTY_MASK(port))) {
- ch = rd_regl(port, SIRFUART_RX_FIFO_DATA) | SIRFUART_DUMMY_READ;
+ struct tty_struct *tty;
+ tty = tty_port_tty_get(&port->state->port);
+ if (!tty)
+ return -ENODEV;
+ while (!(rd_regl(port, ureg->sirfsoc_rx_fifo_status) &
+ ufifo_st->ff_empty(port->line))) {
+ ch = rd_regl(port, ureg->sirfsoc_rx_fifo_data) |
+ SIRFUART_DUMMY_READ;
if (unlikely(uart_handle_sysrq_char(port, ch)))
continue;
uart_insert_char(port, 0, 0, ch, TTY_NORMAL);
@@ -218,8 +426,12 @@ sirfsoc_uart_pio_rx_chars(struct uart_port *port, unsigned int max_rx_count)
break;
}
+ sirfport->rx_io_count += rx_count;
port->icount.rx += rx_count;
+
+ spin_unlock(&port->lock);
tty_flip_buffer_push(&port->state->port);
+ spin_lock(&port->lock);
return rx_count;
}
@@ -228,13 +440,16 @@ static unsigned int
sirfsoc_uart_pio_tx_chars(struct sirfsoc_uart_port *sirfport, int count)
{
struct uart_port *port = &sirfport->port;
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
+ struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status;
struct circ_buf *xmit = &port->state->xmit;
unsigned int num_tx = 0;
while (!uart_circ_empty(xmit) &&
- !(rd_regl(port, SIRFUART_TX_FIFO_STATUS) &
- SIRFUART_FIFOFULL_MASK(port)) &&
+ !(rd_regl(port, ureg->sirfsoc_tx_fifo_status) &
+ ufifo_st->ff_full(port->line)) &&
count--) {
- wr_regl(port, SIRFUART_TX_FIFO_DATA, xmit->buf[xmit->tail]);
+ wr_regl(port, ureg->sirfsoc_tx_fifo_data,
+ xmit->buf[xmit->tail]);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
num_tx++;
@@ -244,6 +459,166 @@ sirfsoc_uart_pio_tx_chars(struct sirfsoc_uart_port *sirfport, int count)
return num_tx;
}
+static void sirfsoc_uart_tx_dma_complete_callback(void *param)
+{
+ struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param;
+ struct uart_port *port = &sirfport->port;
+ struct circ_buf *xmit = &port->state->xmit;
+ unsigned long flags;
+
+ xmit->tail = (xmit->tail + sirfport->transfer_size) &
+ (UART_XMIT_SIZE - 1);
+ port->icount.tx += sirfport->transfer_size;
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(port);
+ if (sirfport->tx_dma_addr)
+ dma_unmap_single(port->dev, sirfport->tx_dma_addr,
+ sirfport->transfer_size, DMA_TO_DEVICE);
+ spin_lock_irqsave(&sirfport->tx_lock, flags);
+ sirfport->tx_dma_state = TX_DMA_IDLE;
+ sirfsoc_uart_tx_with_dma(sirfport);
+ spin_unlock_irqrestore(&sirfport->tx_lock, flags);
+}
+
+static void sirfsoc_uart_insert_rx_buf_to_tty(
+ struct sirfsoc_uart_port *sirfport, int count)
+{
+ struct uart_port *port = &sirfport->port;
+ struct tty_port *tport = &port->state->port;
+ int inserted;
+
+ inserted = tty_insert_flip_string(tport,
+ sirfport->rx_dma_items[sirfport->rx_completed].xmit.buf, count);
+ port->icount.rx += inserted;
+ tty_flip_buffer_push(tport);
+}
+
+static void sirfsoc_rx_submit_one_dma_desc(struct uart_port *port, int index)
+{
+ struct sirfsoc_uart_port *sirfport = to_sirfport(port);
+
+ sirfport->rx_dma_items[index].xmit.tail =
+ sirfport->rx_dma_items[index].xmit.head = 0;
+ sirfport->rx_dma_items[index].desc =
+ dmaengine_prep_slave_single(sirfport->rx_dma_chan,
+ sirfport->rx_dma_items[index].dma_addr, SIRFSOC_RX_DMA_BUF_SIZE,
+ DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
+ if (!sirfport->rx_dma_items[index].desc) {
+ dev_err(port->dev, "DMA slave single fail\n");
+ return;
+ }
+ sirfport->rx_dma_items[index].desc->callback =
+ sirfsoc_uart_rx_dma_complete_callback;
+ sirfport->rx_dma_items[index].desc->callback_param = sirfport;
+ sirfport->rx_dma_items[index].cookie =
+ dmaengine_submit(sirfport->rx_dma_items[index].desc);
+ dma_async_issue_pending(sirfport->rx_dma_chan);
+}
+
+static void sirfsoc_rx_tmo_process_tl(unsigned long param)
+{
+ struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param;
+ struct uart_port *port = &sirfport->port;
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
+ struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
+ struct sirfsoc_int_status *uint_st = &sirfport->uart_reg->uart_int_st;
+ unsigned int count;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sirfport->rx_lock, flags);
+ while (sirfport->rx_completed != sirfport->rx_issued) {
+ sirfsoc_uart_insert_rx_buf_to_tty(sirfport,
+ SIRFSOC_RX_DMA_BUF_SIZE);
+ sirfsoc_rx_submit_one_dma_desc(port, sirfport->rx_completed++);
+ sirfport->rx_completed %= SIRFSOC_RX_LOOP_BUF_CNT;
+ }
+ count = CIRC_CNT(sirfport->rx_dma_items[sirfport->rx_issued].xmit.head,
+ sirfport->rx_dma_items[sirfport->rx_issued].xmit.tail,
+ SIRFSOC_RX_DMA_BUF_SIZE);
+ if (count > 0)
+ sirfsoc_uart_insert_rx_buf_to_tty(sirfport, count);
+ wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
+ rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) |
+ SIRFUART_IO_MODE);
+ sirfsoc_uart_pio_rx_chars(port, 4 - sirfport->rx_io_count);
+ spin_unlock_irqrestore(&sirfport->rx_lock, flags);
+ if (sirfport->rx_io_count == 4) {
+ spin_lock_irqsave(&sirfport->rx_lock, flags);
+ sirfport->rx_io_count = 0;
+ wr_regl(port, ureg->sirfsoc_int_st_reg,
+ uint_st->sirfsoc_rx_done);
+ if (!sirfport->is_marco)
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ rd_regl(port, ureg->sirfsoc_int_en_reg) &
+ ~(uint_en->sirfsoc_rx_done_en));
+ else
+ wr_regl(port, SIRFUART_INT_EN_CLR,
+ uint_en->sirfsoc_rx_done_en);
+ spin_unlock_irqrestore(&sirfport->rx_lock, flags);
+
+ sirfsoc_uart_start_next_rx_dma(port);
+ } else {
+ spin_lock_irqsave(&sirfport->rx_lock, flags);
+ wr_regl(port, ureg->sirfsoc_int_st_reg,
+ uint_st->sirfsoc_rx_done);
+ if (!sirfport->is_marco)
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ rd_regl(port, ureg->sirfsoc_int_en_reg) |
+ (uint_en->sirfsoc_rx_done_en));
+ else
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ uint_en->sirfsoc_rx_done_en);
+ spin_unlock_irqrestore(&sirfport->rx_lock, flags);
+ }
+}
+
+static void sirfsoc_uart_handle_rx_tmo(struct sirfsoc_uart_port *sirfport)
+{
+ struct uart_port *port = &sirfport->port;
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
+ struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
+ struct dma_tx_state tx_state;
+ spin_lock(&sirfport->rx_lock);
+
+ dmaengine_tx_status(sirfport->rx_dma_chan,
+ sirfport->rx_dma_items[sirfport->rx_issued].cookie, &tx_state);
+ dmaengine_terminate_all(sirfport->rx_dma_chan);
+ sirfport->rx_dma_items[sirfport->rx_issued].xmit.head =
+ SIRFSOC_RX_DMA_BUF_SIZE - tx_state.residue;
+ if (!sirfport->is_marco)
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ rd_regl(port, ureg->sirfsoc_int_en_reg) &
+ ~(uint_en->sirfsoc_rx_timeout_en));
+ else
+ wr_regl(port, SIRFUART_INT_EN_CLR,
+ uint_en->sirfsoc_rx_timeout_en);
+ spin_unlock(&sirfport->rx_lock);
+ tasklet_schedule(&sirfport->rx_tmo_process_tasklet);
+}
+
+static void sirfsoc_uart_handle_rx_done(struct sirfsoc_uart_port *sirfport)
+{
+ struct uart_port *port = &sirfport->port;
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
+ struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
+ struct sirfsoc_int_status *uint_st = &sirfport->uart_reg->uart_int_st;
+
+ sirfsoc_uart_pio_rx_chars(port, 4 - sirfport->rx_io_count);
+ if (sirfport->rx_io_count == 4) {
+ sirfport->rx_io_count = 0;
+ if (!sirfport->is_marco)
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ rd_regl(port, ureg->sirfsoc_int_en_reg) &
+ ~(uint_en->sirfsoc_rx_done_en));
+ else
+ wr_regl(port, SIRFUART_INT_EN_CLR,
+ uint_en->sirfsoc_rx_done_en);
+ wr_regl(port, ureg->sirfsoc_int_st_reg,
+ uint_st->sirfsoc_rx_timeout);
+ sirfsoc_uart_start_next_rx_dma(port);
+ }
+}
+
static irqreturn_t sirfsoc_uart_isr(int irq, void *dev_id)
{
unsigned long intr_status;
@@ -251,79 +626,191 @@ static irqreturn_t sirfsoc_uart_isr(int irq, void *dev_id)
unsigned long flag = TTY_NORMAL;
struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)dev_id;
struct uart_port *port = &sirfport->port;
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
+ struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status;
+ struct sirfsoc_int_status *uint_st = &sirfport->uart_reg->uart_int_st;
+ struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
struct uart_state *state = port->state;
struct circ_buf *xmit = &port->state->xmit;
spin_lock(&port->lock);
- intr_status = rd_regl(port, SIRFUART_INT_STATUS);
- wr_regl(port, SIRFUART_INT_STATUS, intr_status);
- intr_status &= rd_regl(port, SIRFUART_INT_EN);
- if (unlikely(intr_status & (SIRFUART_ERR_INT_STAT))) {
- if (intr_status & SIRFUART_RXD_BREAK) {
+ intr_status = rd_regl(port, ureg->sirfsoc_int_st_reg);
+ wr_regl(port, ureg->sirfsoc_int_st_reg, intr_status);
+ intr_status &= rd_regl(port, ureg->sirfsoc_int_en_reg);
+ if (unlikely(intr_status & (SIRFUART_ERR_INT_STAT(port, uint_st)))) {
+ if (intr_status & uint_st->sirfsoc_rxd_brk) {
+ port->icount.brk++;
if (uart_handle_break(port))
goto recv_char;
- uart_insert_char(port, intr_status,
- SIRFUART_RX_OFLOW, 0, TTY_BREAK);
- spin_unlock(&port->lock);
- return IRQ_HANDLED;
}
- if (intr_status & SIRFUART_RX_OFLOW)
+ if (intr_status & uint_st->sirfsoc_rx_oflow)
port->icount.overrun++;
- if (intr_status & SIRFUART_FRM_ERR) {
+ if (intr_status & uint_st->sirfsoc_frm_err) {
port->icount.frame++;
flag = TTY_FRAME;
}
- if (intr_status & SIRFUART_PARITY_ERR)
+ if (intr_status & uint_st->sirfsoc_parity_err)
flag = TTY_PARITY;
- wr_regl(port, SIRFUART_RX_FIFO_OP, SIRFUART_RX_FIFO_RESET);
- wr_regl(port, SIRFUART_RX_FIFO_OP, 0);
- wr_regl(port, SIRFUART_RX_FIFO_OP, SIRFUART_RX_FIFO_START);
+ wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_RESET);
+ wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0);
+ wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_START);
intr_status &= port->read_status_mask;
uart_insert_char(port, intr_status,
- SIRFUART_RX_OFLOW_INT, 0, flag);
+ uint_en->sirfsoc_rx_oflow_en, 0, flag);
+ tty_flip_buffer_push(&state->port);
}
recv_char:
- if (intr_status & SIRFUART_CTS_INT_EN) {
- cts_status = !(rd_regl(port, SIRFUART_AFC_CTRL) &
- SIRFUART_CTS_IN_STATUS);
- if (cts_status != 0) {
- uart_handle_cts_change(port, 1);
- } else {
- uart_handle_cts_change(port, 0);
- wake_up_interruptible(&state->port.delta_msr_wait);
- }
+ if ((sirfport->uart_reg->uart_type == SIRF_REAL_UART) &&
+ (intr_status & SIRFUART_CTS_INT_ST(uint_st)) &&
+ !sirfport->tx_dma_state) {
+ cts_status = rd_regl(port, ureg->sirfsoc_afc_ctrl) &
+ SIRFUART_AFC_CTS_STATUS;
+ if (cts_status != 0)
+ cts_status = 0;
+ else
+ cts_status = 1;
+ uart_handle_cts_change(port, cts_status);
+ wake_up_interruptible(&state->port.delta_msr_wait);
}
- if (intr_status & SIRFUART_RX_IO_INT_EN)
- sirfsoc_uart_pio_rx_chars(port, SIRFSOC_UART_IO_RX_MAX_CNT);
- if (intr_status & SIRFUART_TX_INT_EN) {
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
- spin_unlock(&port->lock);
- return IRQ_HANDLED;
- } else {
- sirfsoc_uart_pio_tx_chars(sirfport,
+ if (IS_DMA_CHAN_VALID(sirfport->rx_dma_no)) {
+ if (intr_status & uint_st->sirfsoc_rx_timeout)
+ sirfsoc_uart_handle_rx_tmo(sirfport);
+ if (intr_status & uint_st->sirfsoc_rx_done)
+ sirfsoc_uart_handle_rx_done(sirfport);
+ } else {
+ if (intr_status & SIRFUART_RX_IO_INT_ST(uint_st))
+ sirfsoc_uart_pio_rx_chars(port,
+ SIRFSOC_UART_IO_RX_MAX_CNT);
+ }
+ if (intr_status & uint_st->sirfsoc_txfifo_empty) {
+ if (IS_DMA_CHAN_VALID(sirfport->tx_dma_no))
+ sirfsoc_uart_tx_with_dma(sirfport);
+ else {
+ if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+ spin_unlock(&port->lock);
+ return IRQ_HANDLED;
+ } else {
+ sirfsoc_uart_pio_tx_chars(sirfport,
SIRFSOC_UART_IO_TX_REASONABLE_CNT);
- if ((uart_circ_empty(xmit)) &&
- (rd_regl(port, SIRFUART_TX_FIFO_STATUS) &
- SIRFUART_FIFOEMPTY_MASK(port)))
- sirfsoc_uart_stop_tx(port);
+ if ((uart_circ_empty(xmit)) &&
+ (rd_regl(port, ureg->sirfsoc_tx_fifo_status) &
+ ufifo_st->ff_empty(port->line)))
+ sirfsoc_uart_stop_tx(port);
+ }
}
}
spin_unlock(&port->lock);
return IRQ_HANDLED;
}
+static void sirfsoc_uart_rx_dma_complete_tl(unsigned long param)
+{
+ struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param;
+ struct uart_port *port = &sirfport->port;
+ unsigned long flags;
+ spin_lock_irqsave(&sirfport->rx_lock, flags);
+ while (sirfport->rx_completed != sirfport->rx_issued) {
+ sirfsoc_uart_insert_rx_buf_to_tty(sirfport,
+ SIRFSOC_RX_DMA_BUF_SIZE);
+ sirfsoc_rx_submit_one_dma_desc(port, sirfport->rx_completed++);
+ sirfport->rx_completed %= SIRFSOC_RX_LOOP_BUF_CNT;
+ }
+ spin_unlock_irqrestore(&sirfport->rx_lock, flags);
+}
+
+static void sirfsoc_uart_rx_dma_complete_callback(void *param)
+{
+ struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param;
+ spin_lock(&sirfport->rx_lock);
+ sirfport->rx_issued++;
+ sirfport->rx_issued %= SIRFSOC_RX_LOOP_BUF_CNT;
+ spin_unlock(&sirfport->rx_lock);
+ tasklet_schedule(&sirfport->rx_dma_complete_tasklet);
+}
+
+/* submit rx dma task into dmaengine */
+static void sirfsoc_uart_start_next_rx_dma(struct uart_port *port)
+{
+ struct sirfsoc_uart_port *sirfport = to_sirfport(port);
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
+ struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
+ unsigned long flags;
+ int i;
+ spin_lock_irqsave(&sirfport->rx_lock, flags);
+ sirfport->rx_io_count = 0;
+ wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
+ rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) &
+ ~SIRFUART_IO_MODE);
+ spin_unlock_irqrestore(&sirfport->rx_lock, flags);
+ for (i = 0; i < SIRFSOC_RX_LOOP_BUF_CNT; i++)
+ sirfsoc_rx_submit_one_dma_desc(port, i);
+ sirfport->rx_completed = sirfport->rx_issued = 0;
+ spin_lock_irqsave(&sirfport->rx_lock, flags);
+ if (!sirfport->is_marco)
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ rd_regl(port, ureg->sirfsoc_int_en_reg) |
+ SIRFUART_RX_DMA_INT_EN(port, uint_en));
+ else
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ SIRFUART_RX_DMA_INT_EN(port, uint_en));
+ spin_unlock_irqrestore(&sirfport->rx_lock, flags);
+}
+
static void sirfsoc_uart_start_rx(struct uart_port *port)
{
- unsigned long regv;
- regv = rd_regl(port, SIRFUART_INT_EN);
- wr_regl(port, SIRFUART_INT_EN, regv | SIRFUART_RX_IO_INT_EN);
- wr_regl(port, SIRFUART_RX_FIFO_OP, SIRFUART_RX_FIFO_RESET);
- wr_regl(port, SIRFUART_RX_FIFO_OP, 0);
- wr_regl(port, SIRFUART_RX_FIFO_OP, SIRFUART_RX_FIFO_START);
+ struct sirfsoc_uart_port *sirfport = to_sirfport(port);
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
+ struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
+
+ sirfport->rx_io_count = 0;
+ wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_RESET);
+ wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0);
+ wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_START);
+ if (IS_DMA_CHAN_VALID(sirfport->rx_dma_no))
+ sirfsoc_uart_start_next_rx_dma(port);
+ else {
+ if (!sirfport->is_marco)
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ rd_regl(port, ureg->sirfsoc_int_en_reg) |
+ SIRFUART_RX_IO_INT_EN(port, uint_en));
+ else
+ wr_regl(port, ureg->sirfsoc_int_en_reg,
+ SIRFUART_RX_IO_INT_EN(port, uint_en));
+ }
+}
+
+static unsigned int
+sirfsoc_usp_calc_sample_div(unsigned long set_rate,
+ unsigned long ioclk_rate, unsigned long *sample_reg)
+{
+ unsigned long min_delta = ~0UL;
+ unsigned short sample_div;
+ unsigned long ioclk_div = 0;
+ unsigned long temp_delta;
+
+ for (sample_div = SIRF_MIN_SAMPLE_DIV;
+ sample_div <= SIRF_MAX_SAMPLE_DIV; sample_div++) {
+ temp_delta = ioclk_rate -
+ (ioclk_rate + (set_rate * sample_div) / 2)
+ / (set_rate * sample_div) * set_rate * sample_div;
+
+ temp_delta = (temp_delta > 0) ? temp_delta : -temp_delta;
+ if (temp_delta < min_delta) {
+ ioclk_div = (2 * ioclk_rate /
+ (set_rate * sample_div) + 1) / 2 - 1;
+ if (ioclk_div > SIRF_IOCLK_DIV_MAX)
+ continue;
+ min_delta = temp_delta;
+ *sample_reg = sample_div;
+ if (!temp_delta)
+ break;
+ }
+ }
+ return ioclk_div;
}
static unsigned int
-sirfsoc_calc_sample_div(unsigned long baud_rate,
- unsigned long ioclk_rate, unsigned long *setted_baud)
+sirfsoc_uart_calc_sample_div(unsigned long baud_rate,
+ unsigned long ioclk_rate, unsigned long *set_baud)
{
unsigned long min_delta = ~0UL;
unsigned short sample_div;
@@ -346,7 +833,7 @@ sirfsoc_calc_sample_div(unsigned long baud_rate,
regv = regv & (~SIRF_SAMPLE_DIV_MASK);
regv = regv | (sample_div << SIRF_SAMPLE_DIV_SHIFT);
min_delta = temp_delta;
- *setted_baud = baud_tmp;
+ *set_baud = baud_tmp;
}
}
return regv;
@@ -357,63 +844,93 @@ static void sirfsoc_uart_set_termios(struct uart_port *port,
struct ktermios *old)
{
struct sirfsoc_uart_port *sirfport = to_sirfport(port);
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
+ struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
unsigned long config_reg = 0;
unsigned long baud_rate;
- unsigned long setted_baud;
+ unsigned long set_baud;
unsigned long flags;
unsigned long ic;
unsigned int clk_div_reg = 0;
- unsigned long temp_reg_val;
+ unsigned long txfifo_op_reg, ioclk_rate;
unsigned long rx_time_out;
int threshold_div;
- int temp;
+ u32 data_bit_len, stop_bit_len, len_val;
+ unsigned long sample_div_reg = 0xf;
+ ioclk_rate = port->uartclk;
switch (termios->c_cflag & CSIZE) {
default:
case CS8:
+ data_bit_len = 8;
config_reg |= SIRFUART_DATA_BIT_LEN_8;
break;
case CS7:
+ data_bit_len = 7;
config_reg |= SIRFUART_DATA_BIT_LEN_7;
break;
case CS6:
+ data_bit_len = 6;
config_reg |= SIRFUART_DATA_BIT_LEN_6;
break;
case CS5:
+ data_bit_len = 5;
config_reg |= SIRFUART_DATA_BIT_LEN_5;
break;
}
- if (termios->c_cflag & CSTOPB)
+ if (termios->c_cflag & CSTOPB) {
config_reg |= SIRFUART_STOP_BIT_LEN_2;
- baud_rate = uart_get_baud_rate(port, termios, old, 0, 4000000);
+ stop_bit_len = 2;
+ } else
+ stop_bit_len = 1;
+
spin_lock_irqsave(&port->lock, flags);
- port->read_status_mask = SIRFUART_RX_OFLOW_INT;
+ port->read_status_mask = uint_en->sirfsoc_rx_oflow_en;
port->ignore_status_mask = 0;
- /* read flags */
- if (termios->c_iflag & INPCK)
- port->read_status_mask |=
- SIRFUART_FRM_ERR_INT | SIRFUART_PARITY_ERR_INT;
+ if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
+ if (termios->c_iflag & INPCK)
+ port->read_status_mask |= uint_en->sirfsoc_frm_err_en |
+ uint_en->sirfsoc_parity_err_en;
+ } else {
+ if (termios->c_iflag & INPCK)
+ port->read_status_mask |= uint_en->sirfsoc_frm_err_en;
+ }
if (termios->c_iflag & (BRKINT | PARMRK))
- port->read_status_mask |= SIRFUART_RXD_BREAK_INT;
- /* ignore flags */
- if (termios->c_iflag & IGNPAR)
+ port->read_status_mask |= uint_en->sirfsoc_rxd_brk_en;
+ if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
+ if (termios->c_iflag & IGNPAR)
+ port->ignore_status_mask |=
+ uint_en->sirfsoc_frm_err_en |
+ uint_en->sirfsoc_parity_err_en;
+ if (termios->c_cflag & PARENB) {
+ if (termios->c_cflag & CMSPAR) {
+ if (termios->c_cflag & PARODD)
+ config_reg |= SIRFUART_STICK_BIT_MARK;
+ else
+ config_reg |= SIRFUART_STICK_BIT_SPACE;
+ } else if (termios->c_cflag & PARODD) {
+ config_reg |= SIRFUART_STICK_BIT_ODD;
+ } else {
+ config_reg |= SIRFUART_STICK_BIT_EVEN;
+ }
+ }
+ } else {
+ if (termios->c_iflag & IGNPAR)
+ port->ignore_status_mask |=
+ uint_en->sirfsoc_frm_err_en;
+ if (termios->c_cflag & PARENB)
+ dev_warn(port->dev,
+ "USP-UART not support parity err\n");
+ }
+ if (termios->c_iflag & IGNBRK) {
port->ignore_status_mask |=
- SIRFUART_FRM_ERR_INT | SIRFUART_PARITY_ERR_INT;
+ uint_en->sirfsoc_rxd_brk_en;
+ if (termios->c_iflag & IGNPAR)
+ port->ignore_status_mask |=
+ uint_en->sirfsoc_rx_oflow_en;
+ }
if ((termios->c_cflag & CREAD) == 0)
port->ignore_status_mask |= SIRFUART_DUMMY_READ;
- /* enable parity if PARENB is set*/
- if (termios->c_cflag & PARENB) {
- if (termios->c_cflag & CMSPAR) {
- if (termios->c_cflag & PARODD)
- config_reg |= SIRFUART_STICK_BIT_MARK;
- else
- config_reg |= SIRFUART_STICK_BIT_SPACE;
- } else if (termios->c_cflag & PARODD) {
- config_reg |= SIRFUART_STICK_BIT_ODD;
- } else {
- config_reg |= SIRFUART_STICK_BIT_EVEN;
- }
- }
/* Hardware Flow Control Settings */
if (UART_ENABLE_MS(port, termios->c_cflag)) {
if (!sirfport->ms_enabled)
@@ -422,75 +939,184 @@ static void sirfsoc_uart_set_termios(struct uart_port *port,
if (sirfport->ms_enabled)
sirfsoc_uart_disable_ms(port);
}
-
- if (port->uartclk == 150000000) {
- /* common rate: fast calculation */
+ baud_rate = uart_get_baud_rate(port, termios, old, 0, 4000000);
+ if (ioclk_rate == 150000000) {
for (ic = 0; ic < SIRF_BAUD_RATE_SUPPORT_NR; ic++)
if (baud_rate == baudrate_to_regv[ic].baud_rate)
clk_div_reg = baudrate_to_regv[ic].reg_val;
}
-
- setted_baud = baud_rate;
- /* arbitary rate setting */
- if (unlikely(clk_div_reg == 0))
- clk_div_reg = sirfsoc_calc_sample_div(baud_rate, port->uartclk,
- &setted_baud);
- wr_regl(port, SIRFUART_DIVISOR, clk_div_reg);
-
+ set_baud = baud_rate;
+ if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
+ if (unlikely(clk_div_reg == 0))
+ clk_div_reg = sirfsoc_uart_calc_sample_div(baud_rate,
+ ioclk_rate, &set_baud);
+ wr_regl(port, ureg->sirfsoc_divisor, clk_div_reg);
+ } else {
+ clk_div_reg = sirfsoc_usp_calc_sample_div(baud_rate,
+ ioclk_rate, &sample_div_reg);
+ sample_div_reg--;
+ set_baud = ((ioclk_rate / (clk_div_reg+1) - 1) /
+ (sample_div_reg + 1));
+ /* setting usp mode 2 */
+ len_val = ((1 << SIRFSOC_USP_MODE2_RXD_DELAY_OFFSET) |
+ (1 << SIRFSOC_USP_MODE2_TXD_DELAY_OFFSET));
+ len_val |= ((clk_div_reg & SIRFSOC_USP_MODE2_CLK_DIVISOR_MASK)
+ << SIRFSOC_USP_MODE2_CLK_DIVISOR_OFFSET);
+ wr_regl(port, ureg->sirfsoc_mode2, len_val);
+ }
if (tty_termios_baud_rate(termios))
- tty_termios_encode_baud_rate(termios, setted_baud, setted_baud);
-
- /* set receive timeout */
- rx_time_out = SIRFSOC_UART_RX_TIMEOUT(baud_rate, 20000);
- rx_time_out = (rx_time_out > 0xFFFF) ? 0xFFFF : rx_time_out;
- config_reg |= SIRFUART_RECV_TIMEOUT(rx_time_out);
- temp_reg_val = rd_regl(port, SIRFUART_TX_FIFO_OP);
- wr_regl(port, SIRFUART_RX_FIFO_OP, 0);
- wr_regl(port, SIRFUART_TX_FIFO_OP,
- temp_reg_val & ~SIRFUART_TX_FIFO_START);
- wr_regl(port, SIRFUART_TX_DMA_IO_CTRL, SIRFUART_TX_MODE_IO);
- wr_regl(port, SIRFUART_RX_DMA_IO_CTRL, SIRFUART_RX_MODE_IO);
- wr_regl(port, SIRFUART_LINE_CTRL, config_reg);
-
+ tty_termios_encode_baud_rate(termios, set_baud, set_baud);
+ /* set receive timeout && data bits len */
+ rx_time_out = SIRFSOC_UART_RX_TIMEOUT(set_baud, 20000);
+ rx_time_out = SIRFUART_RECV_TIMEOUT_VALUE(rx_time_out);
+ txfifo_op_reg = rd_regl(port, ureg->sirfsoc_tx_fifo_op);
+ wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_STOP);
+ wr_regl(port, ureg->sirfsoc_tx_fifo_op,
+ (txfifo_op_reg & ~SIRFUART_FIFO_START));
+ if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
+ config_reg |= SIRFUART_RECV_TIMEOUT(port, rx_time_out);
+ wr_regl(port, ureg->sirfsoc_line_ctrl, config_reg);
+ } else {
+ /*tx frame ctrl*/
+ len_val = (data_bit_len - 1) << SIRFSOC_USP_TX_DATA_LEN_OFFSET;
+ len_val |= (data_bit_len + 1 + stop_bit_len - 1) <<
+ SIRFSOC_USP_TX_FRAME_LEN_OFFSET;
+ len_val |= ((data_bit_len - 1) <<
+ SIRFSOC_USP_TX_SHIFTER_LEN_OFFSET);
+ len_val |= (((clk_div_reg & 0xc00) >> 10) <<
+ SIRFSOC_USP_TX_CLK_DIVISOR_OFFSET);
+ wr_regl(port, ureg->sirfsoc_tx_frame_ctrl, len_val);
+ /*rx frame ctrl*/
+ len_val = (data_bit_len - 1) << SIRFSOC_USP_RX_DATA_LEN_OFFSET;
+ len_val |= (data_bit_len + 1 + stop_bit_len - 1) <<
+ SIRFSOC_USP_RX_FRAME_LEN_OFFSET;
+ len_val |= (data_bit_len - 1) <<
+ SIRFSOC_USP_RX_SHIFTER_LEN_OFFSET;
+ len_val |= (((clk_div_reg & 0xf000) >> 12) <<
+ SIRFSOC_USP_RX_CLK_DIVISOR_OFFSET);
+ wr_regl(port, ureg->sirfsoc_rx_frame_ctrl, len_val);
+ /*async param*/
+ wr_regl(port, ureg->sirfsoc_async_param_reg,
+ (SIRFUART_RECV_TIMEOUT(port, rx_time_out)) |
+ (sample_div_reg & SIRFSOC_USP_ASYNC_DIV2_MASK) <<
+ SIRFSOC_USP_ASYNC_DIV2_OFFSET);
+ }
+ if (IS_DMA_CHAN_VALID(sirfport->tx_dma_no))
+ wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, SIRFUART_DMA_MODE);
+ else
+ wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, SIRFUART_IO_MODE);
+ if (IS_DMA_CHAN_VALID(sirfport->rx_dma_no))
+ wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, SIRFUART_DMA_MODE);
+ else
+ wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, SIRFUART_IO_MODE);
/* Reset Rx/Tx FIFO Threshold level for proper baudrate */
- if (baud_rate < 1000000)
+ if (set_baud < 1000000)
threshold_div = 1;
else
threshold_div = 2;
- temp = port->line == 1 ? 16 : 64;
- wr_regl(port, SIRFUART_TX_FIFO_CTRL, temp / threshold_div);
- wr_regl(port, SIRFUART_RX_FIFO_CTRL, temp / threshold_div);
- temp_reg_val |= SIRFUART_TX_FIFO_START;
- wr_regl(port, SIRFUART_TX_FIFO_OP, temp_reg_val);
- uart_update_timeout(port, termios->c_cflag, baud_rate);
+ wr_regl(port, ureg->sirfsoc_tx_fifo_ctrl,
+ SIRFUART_FIFO_THD(port) / threshold_div);
+ wr_regl(port, ureg->sirfsoc_rx_fifo_ctrl,
+ SIRFUART_FIFO_THD(port) / threshold_div);
+ txfifo_op_reg |= SIRFUART_FIFO_START;
+ wr_regl(port, ureg->sirfsoc_tx_fifo_op, txfifo_op_reg);
+ uart_update_timeout(port, termios->c_cflag, set_baud);
sirfsoc_uart_start_rx(port);
- wr_regl(port, SIRFUART_TX_RX_EN, SIRFUART_TX_EN | SIRFUART_RX_EN);
+ wr_regl(port, ureg->sirfsoc_tx_rx_en, SIRFUART_TX_EN | SIRFUART_RX_EN);
spin_unlock_irqrestore(&port->lock, flags);
}
-static void startup_uart_controller(struct uart_port *port)
+static unsigned int sirfsoc_uart_init_tx_dma(struct uart_port *port)
{
- unsigned long temp_regv;
- int temp;
- temp_regv = rd_regl(port, SIRFUART_TX_DMA_IO_CTRL);
- wr_regl(port, SIRFUART_TX_DMA_IO_CTRL, temp_regv | SIRFUART_TX_MODE_IO);
- temp_regv = rd_regl(port, SIRFUART_RX_DMA_IO_CTRL);
- wr_regl(port, SIRFUART_RX_DMA_IO_CTRL, temp_regv | SIRFUART_RX_MODE_IO);
- wr_regl(port, SIRFUART_TX_DMA_IO_LEN, 0);
- wr_regl(port, SIRFUART_RX_DMA_IO_LEN, 0);
- wr_regl(port, SIRFUART_TX_RX_EN, SIRFUART_RX_EN | SIRFUART_TX_EN);
- wr_regl(port, SIRFUART_TX_FIFO_OP, SIRFUART_TX_FIFO_RESET);
- wr_regl(port, SIRFUART_TX_FIFO_OP, 0);
- wr_regl(port, SIRFUART_RX_FIFO_OP, SIRFUART_RX_FIFO_RESET);
- wr_regl(port, SIRFUART_RX_FIFO_OP, 0);
- temp = port->line == 1 ? 16 : 64;
- wr_regl(port, SIRFUART_TX_FIFO_CTRL, temp);
- wr_regl(port, SIRFUART_RX_FIFO_CTRL, temp);
+ struct sirfsoc_uart_port *sirfport = to_sirfport(port);
+ dma_cap_mask_t dma_mask;
+ struct dma_slave_config tx_slv_cfg = {
+ .dst_maxburst = 2,
+ };
+
+ dma_cap_zero(dma_mask);
+ dma_cap_set(DMA_SLAVE, dma_mask);
+ sirfport->tx_dma_chan = dma_request_channel(dma_mask,
+ (dma_filter_fn)sirfsoc_dma_filter_id,
+ (void *)sirfport->tx_dma_no);
+ if (!sirfport->tx_dma_chan) {
+ dev_err(port->dev, "Uart Request Dma Channel Fail %d\n",
+ sirfport->tx_dma_no);
+ return -EPROBE_DEFER;
+ }
+ dmaengine_slave_config(sirfport->tx_dma_chan, &tx_slv_cfg);
+
+ return 0;
+}
+
+static unsigned int sirfsoc_uart_init_rx_dma(struct uart_port *port)
+{
+ struct sirfsoc_uart_port *sirfport = to_sirfport(port);
+ dma_cap_mask_t dma_mask;
+ int ret;
+ int i, j;
+ struct dma_slave_config slv_cfg = {
+ .src_maxburst = 2,
+ };
+
+ dma_cap_zero(dma_mask);
+ dma_cap_set(DMA_SLAVE, dma_mask);
+ sirfport->rx_dma_chan = dma_request_channel(dma_mask,
+ (dma_filter_fn)sirfsoc_dma_filter_id,
+ (void *)sirfport->rx_dma_no);
+ if (!sirfport->rx_dma_chan) {
+ dev_err(port->dev, "Uart Request Dma Channel Fail %d\n",
+ sirfport->rx_dma_no);
+ ret = -EPROBE_DEFER;
+ goto request_err;
+ }
+ for (i = 0; i < SIRFSOC_RX_LOOP_BUF_CNT; i++) {
+ sirfport->rx_dma_items[i].xmit.buf =
+ dma_alloc_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE,
+ &sirfport->rx_dma_items[i].dma_addr, GFP_KERNEL);
+ if (!sirfport->rx_dma_items[i].xmit.buf) {
+ dev_err(port->dev, "Uart alloc bufa failed\n");
+ ret = -ENOMEM;
+ goto alloc_coherent_err;
+ }
+ sirfport->rx_dma_items[i].xmit.head =
+ sirfport->rx_dma_items[i].xmit.tail = 0;
+ }
+ dmaengine_slave_config(sirfport->rx_dma_chan, &slv_cfg);
+
+ return 0;
+alloc_coherent_err:
+ for (j = 0; j < i; j++)
+ dma_free_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE,
+ sirfport->rx_dma_items[j].xmit.buf,
+ sirfport->rx_dma_items[j].dma_addr);
+ dma_release_channel(sirfport->rx_dma_chan);
+request_err:
+ return ret;
+}
+
+static void sirfsoc_uart_uninit_tx_dma(struct sirfsoc_uart_port *sirfport)
+{
+ dmaengine_terminate_all(sirfport->tx_dma_chan);
+ dma_release_channel(sirfport->tx_dma_chan);
+}
+
+static void sirfsoc_uart_uninit_rx_dma(struct sirfsoc_uart_port *sirfport)
+{
+ int i;
+ struct uart_port *port = &sirfport->port;
+ dmaengine_terminate_all(sirfport->rx_dma_chan);
+ dma_release_channel(sirfport->rx_dma_chan);
+ for (i = 0; i < SIRFSOC_RX_LOOP_BUF_CNT; i++)
+ dma_free_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE,
+ sirfport->rx_dma_items[i].xmit.buf,
+ sirfport->rx_dma_items[i].dma_addr);
}
static int sirfsoc_uart_startup(struct uart_port *port)
{
struct sirfsoc_uart_port *sirfport = to_sirfport(port);
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
unsigned int index = port->line;
int ret;
set_irq_flags(port->irq, IRQF_VALID | IRQF_NOAUTOEN);
@@ -504,8 +1130,64 @@ static int sirfsoc_uart_startup(struct uart_port *port)
index, port->irq);
goto irq_err;
}
- startup_uart_controller(port);
+
+ /* initial hardware settings */
+ wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl,
+ rd_regl(port, ureg->sirfsoc_tx_dma_io_ctrl) |
+ SIRFUART_IO_MODE);
+ wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
+ rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) |
+ SIRFUART_IO_MODE);
+ wr_regl(port, ureg->sirfsoc_tx_dma_io_len, 0);
+ wr_regl(port, ureg->sirfsoc_rx_dma_io_len, 0);
+ wr_regl(port, ureg->sirfsoc_tx_rx_en, SIRFUART_RX_EN | SIRFUART_TX_EN);
+ if (sirfport->uart_reg->uart_type == SIRF_USP_UART)
+ wr_regl(port, ureg->sirfsoc_mode1,
+ SIRFSOC_USP_ENDIAN_CTRL_LSBF |
+ SIRFSOC_USP_EN);
+ wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_RESET);
+ wr_regl(port, ureg->sirfsoc_tx_fifo_op, 0);
+ wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_RESET);
+ wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0);
+ wr_regl(port, ureg->sirfsoc_tx_fifo_ctrl, SIRFUART_FIFO_THD(port));
+ wr_regl(port, ureg->sirfsoc_rx_fifo_ctrl, SIRFUART_FIFO_THD(port));
+
+ if (IS_DMA_CHAN_VALID(sirfport->rx_dma_no)) {
+ ret = sirfsoc_uart_init_rx_dma(port);
+ if (ret)
+ goto init_rx_err;
+ wr_regl(port, ureg->sirfsoc_rx_fifo_level_chk,
+ SIRFUART_RX_FIFO_CHK_SC(port->line, 0x4) |
+ SIRFUART_RX_FIFO_CHK_LC(port->line, 0xe) |
+ SIRFUART_RX_FIFO_CHK_HC(port->line, 0x1b));
+ }
+ if (IS_DMA_CHAN_VALID(sirfport->tx_dma_no)) {
+ sirfsoc_uart_init_tx_dma(port);
+ sirfport->tx_dma_state = TX_DMA_IDLE;
+ wr_regl(port, ureg->sirfsoc_tx_fifo_level_chk,
+ SIRFUART_TX_FIFO_CHK_SC(port->line, 0x1b) |
+ SIRFUART_TX_FIFO_CHK_LC(port->line, 0xe) |
+ SIRFUART_TX_FIFO_CHK_HC(port->line, 0x4));
+ }
+ sirfport->ms_enabled = false;
+ if (sirfport->uart_reg->uart_type == SIRF_USP_UART &&
+ sirfport->hw_flow_ctrl) {
+ set_irq_flags(gpio_to_irq(sirfport->cts_gpio),
+ IRQF_VALID | IRQF_NOAUTOEN);
+ ret = request_irq(gpio_to_irq(sirfport->cts_gpio),
+ sirfsoc_uart_usp_cts_handler, IRQF_TRIGGER_FALLING |
+ IRQF_TRIGGER_RISING, "usp_cts_irq", sirfport);
+ if (ret != 0) {
+ dev_err(port->dev, "UART-USP:request gpio irq fail\n");
+ goto init_rx_err;
+ }
+ }
+
enable_irq(port->irq);
+
+ return 0;
+init_rx_err:
+ free_irq(port->irq, sirfport);
irq_err:
return ret;
}
@@ -513,11 +1195,25 @@ irq_err:
static void sirfsoc_uart_shutdown(struct uart_port *port)
{
struct sirfsoc_uart_port *sirfport = to_sirfport(port);
- wr_regl(port, SIRFUART_INT_EN, 0);
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
+ if (!sirfport->is_marco)
+ wr_regl(port, ureg->sirfsoc_int_en_reg, 0);
+ else
+ wr_regl(port, SIRFUART_INT_EN_CLR, ~0UL);
+
free_irq(port->irq, sirfport);
- if (sirfport->ms_enabled) {
+ if (sirfport->ms_enabled)
sirfsoc_uart_disable_ms(port);
- sirfport->ms_enabled = 0;
+ if (sirfport->uart_reg->uart_type == SIRF_USP_UART &&
+ sirfport->hw_flow_ctrl) {
+ gpio_set_value(sirfport->rts_gpio, 1);
+ free_irq(gpio_to_irq(sirfport->cts_gpio), sirfport);
+ }
+ if (IS_DMA_CHAN_VALID(sirfport->rx_dma_no))
+ sirfsoc_uart_uninit_rx_dma(sirfport);
+ if (IS_DMA_CHAN_VALID(sirfport->tx_dma_no)) {
+ sirfsoc_uart_uninit_tx_dma(sirfport);
+ sirfport->tx_dma_state = TX_DMA_IDLE;
}
}
@@ -528,9 +1224,11 @@ static const char *sirfsoc_uart_type(struct uart_port *port)
static int sirfsoc_uart_request_port(struct uart_port *port)
{
+ struct sirfsoc_uart_port *sirfport = to_sirfport(port);
+ struct sirfsoc_uart_param *uart_param = &sirfport->uart_reg->uart_param;
void *ret;
ret = request_mem_region(port->mapbase,
- SIRFUART_MAP_SIZE, SIRFUART_PORT_NAME);
+ SIRFUART_MAP_SIZE, uart_param->port_name);
return ret ? 0 : -EBUSY;
}
@@ -566,32 +1264,45 @@ static struct uart_ops sirfsoc_uart_ops = {
};
#ifdef CONFIG_SERIAL_SIRFSOC_CONSOLE
-static int __init sirfsoc_uart_console_setup(struct console *co, char *options)
+static int __init
+sirfsoc_uart_console_setup(struct console *co, char *options)
{
unsigned int baud = 115200;
unsigned int bits = 8;
unsigned int parity = 'n';
unsigned int flow = 'n';
struct uart_port *port = &sirfsoc_uart_ports[co->index].port;
-
+ struct sirfsoc_uart_port *sirfport = to_sirfport(port);
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
if (co->index < 0 || co->index >= SIRFSOC_UART_NR)
return -EINVAL;
if (!port->mapbase)
return -ENODEV;
+ /* enable usp in mode1 register */
+ if (sirfport->uart_reg->uart_type == SIRF_USP_UART)
+ wr_regl(port, ureg->sirfsoc_mode1, SIRFSOC_USP_EN |
+ SIRFSOC_USP_ENDIAN_CTRL_LSBF);
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
port->cons = co;
+
+ /* default console tx/rx transfer using io mode */
+ sirfport->rx_dma_no = UNVALID_DMA_CHAN;
+ sirfport->tx_dma_no = UNVALID_DMA_CHAN;
return uart_set_options(port, co, baud, parity, bits, flow);
}
static void sirfsoc_uart_console_putchar(struct uart_port *port, int ch)
{
+ struct sirfsoc_uart_port *sirfport = to_sirfport(port);
+ struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
+ struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status;
while (rd_regl(port,
- SIRFUART_TX_FIFO_STATUS) & SIRFUART_FIFOFULL_MASK(port))
+ ureg->sirfsoc_tx_fifo_status) & ufifo_st->ff_full(port->line))
cpu_relax();
- wr_regb(port, SIRFUART_TX_FIFO_DATA, ch);
+ wr_regb(port, ureg->sirfsoc_tx_fifo_data, ch);
}
static void sirfsoc_uart_console_write(struct console *co, const char *s,
@@ -633,27 +1344,99 @@ static struct uart_driver sirfsoc_uart_drv = {
#endif
};
-int sirfsoc_uart_probe(struct platform_device *pdev)
+static struct of_device_id sirfsoc_uart_ids[] = {
+ { .compatible = "sirf,prima2-uart", .data = &sirfsoc_uart,},
+ { .compatible = "sirf,marco-uart", .data = &sirfsoc_uart},
+ { .compatible = "sirf,prima2-usp-uart", .data = &sirfsoc_usp},
+ {}
+};
+MODULE_DEVICE_TABLE(of, sirfsoc_uart_ids);
+
+static int sirfsoc_uart_probe(struct platform_device *pdev)
{
struct sirfsoc_uart_port *sirfport;
struct uart_port *port;
struct resource *res;
int ret;
+ const struct of_device_id *match;
+ match = of_match_node(sirfsoc_uart_ids, pdev->dev.of_node);
if (of_property_read_u32(pdev->dev.of_node, "cell-index", &pdev->id)) {
dev_err(&pdev->dev,
"Unable to find cell-index in uart node.\n");
ret = -EFAULT;
goto err;
}
-
+ if (of_device_is_compatible(pdev->dev.of_node, "sirf,prima2-usp-uart"))
+ pdev->id += ((struct sirfsoc_uart_register *)
+ match->data)->uart_param.register_uart_nr;
sirfport = &sirfsoc_uart_ports[pdev->id];
port = &sirfport->port;
port->dev = &pdev->dev;
port->private_data = sirfport;
+ sirfport->uart_reg = (struct sirfsoc_uart_register *)match->data;
+
+ sirfport->hw_flow_ctrl = of_property_read_bool(pdev->dev.of_node,
+ "sirf,uart-has-rtscts");
+ if (of_device_is_compatible(pdev->dev.of_node, "sirf,prima2-uart")) {
+ sirfport->uart_reg->uart_type = SIRF_REAL_UART;
+ if (of_property_read_u32(pdev->dev.of_node,
+ "sirf,uart-dma-rx-channel",
+ &sirfport->rx_dma_no))
+ sirfport->rx_dma_no = UNVALID_DMA_CHAN;
+ if (of_property_read_u32(pdev->dev.of_node,
+ "sirf,uart-dma-tx-channel",
+ &sirfport->tx_dma_no))
+ sirfport->tx_dma_no = UNVALID_DMA_CHAN;
+ }
+ if (of_device_is_compatible(pdev->dev.of_node, "sirf,prima2-usp-uart")) {
+ sirfport->uart_reg->uart_type = SIRF_USP_UART;
+ if (of_property_read_u32(pdev->dev.of_node,
+ "sirf,usp-dma-rx-channel",
+ &sirfport->rx_dma_no))
+ sirfport->rx_dma_no = UNVALID_DMA_CHAN;
+ if (of_property_read_u32(pdev->dev.of_node,
+ "sirf,usp-dma-tx-channel",
+ &sirfport->tx_dma_no))
+ sirfport->tx_dma_no = UNVALID_DMA_CHAN;
+ if (!sirfport->hw_flow_ctrl)
+ goto usp_no_flow_control;
+ if (of_find_property(pdev->dev.of_node, "cts-gpios", NULL))
+ sirfport->cts_gpio = of_get_named_gpio(
+ pdev->dev.of_node, "cts-gpios", 0);
+ else
+ sirfport->cts_gpio = -1;
+ if (of_find_property(pdev->dev.of_node, "rts-gpios", NULL))
+ sirfport->rts_gpio = of_get_named_gpio(
+ pdev->dev.of_node, "rts-gpios", 0);
+ else
+ sirfport->rts_gpio = -1;
- if (of_find_property(pdev->dev.of_node, "hw_flow_ctrl", NULL))
- sirfport->hw_flow_ctrl = 1;
+ if ((!gpio_is_valid(sirfport->cts_gpio) ||
+ !gpio_is_valid(sirfport->rts_gpio))) {
+ ret = -EINVAL;
+ dev_err(&pdev->dev,
+ "Usp flow control must have cts and rts gpio");
+ goto err;
+ }
+ ret = devm_gpio_request(&pdev->dev, sirfport->cts_gpio,
+ "usp-cts-gpio");
+ if (ret) {
+ dev_err(&pdev->dev, "Unable request cts gpio");
+ goto err;
+ }
+ gpio_direction_input(sirfport->cts_gpio);
+ ret = devm_gpio_request(&pdev->dev, sirfport->rts_gpio,
+ "usp-rts-gpio");
+ if (ret) {
+ dev_err(&pdev->dev, "Unable request rts gpio");
+ goto err;
+ }
+ gpio_direction_output(sirfport->rts_gpio, 1);
+ }
+usp_no_flow_control:
+ if (of_device_is_compatible(pdev->dev.of_node, "sirf,marco-uart"))
+ sirfport->is_marco = true;
if (of_property_read_u32(pdev->dev.of_node,
"fifosize",
@@ -670,6 +1453,12 @@ int sirfsoc_uart_probe(struct platform_device *pdev)
ret = -EFAULT;
goto err;
}
+ spin_lock_init(&sirfport->rx_lock);
+ spin_lock_init(&sirfport->tx_lock);
+ tasklet_init(&sirfport->rx_dma_complete_tasklet,
+ sirfsoc_uart_rx_dma_complete_tl, (unsigned long)sirfport);
+ tasklet_init(&sirfport->rx_tmo_process_tasklet,
+ sirfsoc_rx_tmo_process_tl, (unsigned long)sirfport);
port->mapbase = res->start;
port->membase = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (!port->membase) {
@@ -685,18 +1474,10 @@ int sirfsoc_uart_probe(struct platform_device *pdev)
}
port->irq = res->start;
- if (sirfport->hw_flow_ctrl) {
- sirfport->p = pinctrl_get_select_default(&pdev->dev);
- if (IS_ERR(sirfport->p)) {
- ret = PTR_ERR(sirfport->p);
- goto err;
- }
- }
-
sirfport->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(sirfport->clk)) {
ret = PTR_ERR(sirfport->clk);
- goto clk_err;
+ goto err;
}
clk_prepare_enable(sirfport->clk);
port->uartclk = clk_get_rate(sirfport->clk);
@@ -716,10 +1497,6 @@ int sirfsoc_uart_probe(struct platform_device *pdev)
port_err:
clk_disable_unprepare(sirfport->clk);
clk_put(sirfport->clk);
-clk_err:
- platform_set_drvdata(pdev, NULL);
- if (sirfport->hw_flow_ctrl)
- pinctrl_put(sirfport->p);
err:
return ret;
}
@@ -728,9 +1505,6 @@ static int sirfsoc_uart_remove(struct platform_device *pdev)
{
struct sirfsoc_uart_port *sirfport = platform_get_drvdata(pdev);
struct uart_port *port = &sirfport->port;
- platform_set_drvdata(pdev, NULL);
- if (sirfport->hw_flow_ctrl)
- pinctrl_put(sirfport->p);
clk_disable_unprepare(sirfport->clk);
clk_put(sirfport->clk);
uart_remove_one_port(&sirfsoc_uart_drv, port);
@@ -754,13 +1528,6 @@ static int sirfsoc_uart_resume(struct platform_device *pdev)
return 0;
}
-static struct of_device_id sirfsoc_uart_ids[] = {
- { .compatible = "sirf,prima2-uart", },
- { .compatible = "sirf,marco-uart", },
- {}
-};
-MODULE_DEVICE_TABLE(of, sirfsoc_uart_ids);
-
static struct platform_driver sirfsoc_uart_driver = {
.probe = sirfsoc_uart_probe,
.remove = sirfsoc_uart_remove,
diff --git a/drivers/tty/serial/sirfsoc_uart.h b/drivers/tty/serial/sirfsoc_uart.h
index 85328ba..fb8d0a0 100644
--- a/drivers/tty/serial/sirfsoc_uart.h
+++ b/drivers/tty/serial/sirfsoc_uart.h
@@ -6,31 +6,260 @@
* Licensed under GPLv2 or later.
*/
#include <linux/bitops.h>
+struct sirfsoc_uart_param {
+ const char *uart_name;
+ const char *port_name;
+ u32 uart_nr;
+ u32 register_uart_nr;
+};
+
+struct sirfsoc_register {
+ /* hardware uart specific */
+ u32 sirfsoc_line_ctrl;
+ u32 sirfsoc_divisor;
+ /* uart - usp common */
+ u32 sirfsoc_tx_rx_en;
+ u32 sirfsoc_int_en_reg;
+ u32 sirfsoc_int_st_reg;
+ u32 sirfsoc_tx_dma_io_ctrl;
+ u32 sirfsoc_tx_dma_io_len;
+ u32 sirfsoc_tx_fifo_ctrl;
+ u32 sirfsoc_tx_fifo_level_chk;
+ u32 sirfsoc_tx_fifo_op;
+ u32 sirfsoc_tx_fifo_status;
+ u32 sirfsoc_tx_fifo_data;
+ u32 sirfsoc_rx_dma_io_ctrl;
+ u32 sirfsoc_rx_dma_io_len;
+ u32 sirfsoc_rx_fifo_ctrl;
+ u32 sirfsoc_rx_fifo_level_chk;
+ u32 sirfsoc_rx_fifo_op;
+ u32 sirfsoc_rx_fifo_status;
+ u32 sirfsoc_rx_fifo_data;
+ u32 sirfsoc_afc_ctrl;
+ u32 sirfsoc_swh_dma_io;
+ /* hardware usp specific */
+ u32 sirfsoc_mode1;
+ u32 sirfsoc_mode2;
+ u32 sirfsoc_tx_frame_ctrl;
+ u32 sirfsoc_rx_frame_ctrl;
+ u32 sirfsoc_async_param_reg;
+};
+
+typedef u32 (*fifo_full_mask)(int line);
+typedef u32 (*fifo_empty_mask)(int line);
+
+struct sirfsoc_fifo_status {
+ fifo_full_mask ff_full;
+ fifo_empty_mask ff_empty;
+};
-/* UART Register Offset Define */
-#define SIRFUART_LINE_CTRL 0x0040
-#define SIRFUART_TX_RX_EN 0x004c
-#define SIRFUART_DIVISOR 0x0050
-#define SIRFUART_INT_EN 0x0054
-#define SIRFUART_INT_STATUS 0x0058
-#define SIRFUART_TX_DMA_IO_CTRL 0x0100
-#define SIRFUART_TX_DMA_IO_LEN 0x0104
-#define SIRFUART_TX_FIFO_CTRL 0x0108
-#define SIRFUART_TX_FIFO_LEVEL_CHK 0x010C
-#define SIRFUART_TX_FIFO_OP 0x0110
-#define SIRFUART_TX_FIFO_STATUS 0x0114
-#define SIRFUART_TX_FIFO_DATA 0x0118
-#define SIRFUART_RX_DMA_IO_CTRL 0x0120
-#define SIRFUART_RX_DMA_IO_LEN 0x0124
-#define SIRFUART_RX_FIFO_CTRL 0x0128
-#define SIRFUART_RX_FIFO_LEVEL_CHK 0x012C
-#define SIRFUART_RX_FIFO_OP 0x0130
-#define SIRFUART_RX_FIFO_STATUS 0x0134
-#define SIRFUART_RX_FIFO_DATA 0x0138
-#define SIRFUART_AFC_CTRL 0x0140
-#define SIRFUART_SWH_DMA_IO 0x0148
-
-/* UART Line Control Register */
+struct sirfsoc_int_en {
+ u32 sirfsoc_rx_done_en;
+ u32 sirfsoc_tx_done_en;
+ u32 sirfsoc_rx_oflow_en;
+ u32 sirfsoc_tx_allout_en;
+ u32 sirfsoc_rx_io_dma_en;
+ u32 sirfsoc_tx_io_dma_en;
+ u32 sirfsoc_rxfifo_full_en;
+ u32 sirfsoc_txfifo_empty_en;
+ u32 sirfsoc_rxfifo_thd_en;
+ u32 sirfsoc_txfifo_thd_en;
+ u32 sirfsoc_frm_err_en;
+ u32 sirfsoc_rxd_brk_en;
+ u32 sirfsoc_rx_timeout_en;
+ u32 sirfsoc_parity_err_en;
+ u32 sirfsoc_cts_en;
+ u32 sirfsoc_rts_en;
+};
+
+struct sirfsoc_int_status {
+ u32 sirfsoc_rx_done;
+ u32 sirfsoc_tx_done;
+ u32 sirfsoc_rx_oflow;
+ u32 sirfsoc_tx_allout;
+ u32 sirfsoc_rx_io_dma;
+ u32 sirfsoc_tx_io_dma;
+ u32 sirfsoc_rxfifo_full;
+ u32 sirfsoc_txfifo_empty;
+ u32 sirfsoc_rxfifo_thd;
+ u32 sirfsoc_txfifo_thd;
+ u32 sirfsoc_frm_err;
+ u32 sirfsoc_rxd_brk;
+ u32 sirfsoc_rx_timeout;
+ u32 sirfsoc_parity_err;
+ u32 sirfsoc_cts;
+ u32 sirfsoc_rts;
+};
+
+enum sirfsoc_uart_type {
+ SIRF_REAL_UART,
+ SIRF_USP_UART,
+};
+
+struct sirfsoc_uart_register {
+ struct sirfsoc_register uart_reg;
+ struct sirfsoc_int_en uart_int_en;
+ struct sirfsoc_int_status uart_int_st;
+ struct sirfsoc_fifo_status fifo_status;
+ struct sirfsoc_uart_param uart_param;
+ enum sirfsoc_uart_type uart_type;
+};
+
+u32 usp_ff_full(int line)
+{
+ return 0x80;
+}
+u32 usp_ff_empty(int line)
+{
+ return 0x100;
+}
+u32 uart_ff_full(int line)
+{
+ return (line == 1) ? (0x20) : (0x80);
+}
+u32 uart_ff_empty(int line)
+{
+ return (line == 1) ? (0x40) : (0x100);
+}
+struct sirfsoc_uart_register sirfsoc_usp = {
+ .uart_reg = {
+ .sirfsoc_mode1 = 0x0000,
+ .sirfsoc_mode2 = 0x0004,
+ .sirfsoc_tx_frame_ctrl = 0x0008,
+ .sirfsoc_rx_frame_ctrl = 0x000c,
+ .sirfsoc_tx_rx_en = 0x0010,
+ .sirfsoc_int_en_reg = 0x0014,
+ .sirfsoc_int_st_reg = 0x0018,
+ .sirfsoc_async_param_reg = 0x0024,
+ .sirfsoc_tx_dma_io_ctrl = 0x0100,
+ .sirfsoc_tx_dma_io_len = 0x0104,
+ .sirfsoc_tx_fifo_ctrl = 0x0108,
+ .sirfsoc_tx_fifo_level_chk = 0x010c,
+ .sirfsoc_tx_fifo_op = 0x0110,
+ .sirfsoc_tx_fifo_status = 0x0114,
+ .sirfsoc_tx_fifo_data = 0x0118,
+ .sirfsoc_rx_dma_io_ctrl = 0x0120,
+ .sirfsoc_rx_dma_io_len = 0x0124,
+ .sirfsoc_rx_fifo_ctrl = 0x0128,
+ .sirfsoc_rx_fifo_level_chk = 0x012c,
+ .sirfsoc_rx_fifo_op = 0x0130,
+ .sirfsoc_rx_fifo_status = 0x0134,
+ .sirfsoc_rx_fifo_data = 0x0138,
+ },
+ .uart_int_en = {
+ .sirfsoc_rx_done_en = BIT(0),
+ .sirfsoc_tx_done_en = BIT(1),
+ .sirfsoc_rx_oflow_en = BIT(2),
+ .sirfsoc_tx_allout_en = BIT(3),
+ .sirfsoc_rx_io_dma_en = BIT(4),
+ .sirfsoc_tx_io_dma_en = BIT(5),
+ .sirfsoc_rxfifo_full_en = BIT(6),
+ .sirfsoc_txfifo_empty_en = BIT(7),
+ .sirfsoc_rxfifo_thd_en = BIT(8),
+ .sirfsoc_txfifo_thd_en = BIT(9),
+ .sirfsoc_frm_err_en = BIT(10),
+ .sirfsoc_rx_timeout_en = BIT(11),
+ .sirfsoc_rxd_brk_en = BIT(15),
+ },
+ .uart_int_st = {
+ .sirfsoc_rx_done = BIT(0),
+ .sirfsoc_tx_done = BIT(1),
+ .sirfsoc_rx_oflow = BIT(2),
+ .sirfsoc_tx_allout = BIT(3),
+ .sirfsoc_rx_io_dma = BIT(4),
+ .sirfsoc_tx_io_dma = BIT(5),
+ .sirfsoc_rxfifo_full = BIT(6),
+ .sirfsoc_txfifo_empty = BIT(7),
+ .sirfsoc_rxfifo_thd = BIT(8),
+ .sirfsoc_txfifo_thd = BIT(9),
+ .sirfsoc_frm_err = BIT(10),
+ .sirfsoc_rx_timeout = BIT(11),
+ .sirfsoc_rxd_brk = BIT(15),
+ },
+ .fifo_status = {
+ .ff_full = usp_ff_full,
+ .ff_empty = usp_ff_empty,
+ },
+ .uart_param = {
+ .uart_name = "ttySiRF",
+ .port_name = "sirfsoc-uart",
+ .uart_nr = 2,
+ .register_uart_nr = 3,
+ },
+};
+
+struct sirfsoc_uart_register sirfsoc_uart = {
+ .uart_reg = {
+ .sirfsoc_line_ctrl = 0x0040,
+ .sirfsoc_tx_rx_en = 0x004c,
+ .sirfsoc_divisor = 0x0050,
+ .sirfsoc_int_en_reg = 0x0054,
+ .sirfsoc_int_st_reg = 0x0058,
+ .sirfsoc_tx_dma_io_ctrl = 0x0100,
+ .sirfsoc_tx_dma_io_len = 0x0104,
+ .sirfsoc_tx_fifo_ctrl = 0x0108,
+ .sirfsoc_tx_fifo_level_chk = 0x010c,
+ .sirfsoc_tx_fifo_op = 0x0110,
+ .sirfsoc_tx_fifo_status = 0x0114,
+ .sirfsoc_tx_fifo_data = 0x0118,
+ .sirfsoc_rx_dma_io_ctrl = 0x0120,
+ .sirfsoc_rx_dma_io_len = 0x0124,
+ .sirfsoc_rx_fifo_ctrl = 0x0128,
+ .sirfsoc_rx_fifo_level_chk = 0x012c,
+ .sirfsoc_rx_fifo_op = 0x0130,
+ .sirfsoc_rx_fifo_status = 0x0134,
+ .sirfsoc_rx_fifo_data = 0x0138,
+ .sirfsoc_afc_ctrl = 0x0140,
+ .sirfsoc_swh_dma_io = 0x0148,
+ },
+ .uart_int_en = {
+ .sirfsoc_rx_done_en = BIT(0),
+ .sirfsoc_tx_done_en = BIT(1),
+ .sirfsoc_rx_oflow_en = BIT(2),
+ .sirfsoc_tx_allout_en = BIT(3),
+ .sirfsoc_rx_io_dma_en = BIT(4),
+ .sirfsoc_tx_io_dma_en = BIT(5),
+ .sirfsoc_rxfifo_full_en = BIT(6),
+ .sirfsoc_txfifo_empty_en = BIT(7),
+ .sirfsoc_rxfifo_thd_en = BIT(8),
+ .sirfsoc_txfifo_thd_en = BIT(9),
+ .sirfsoc_frm_err_en = BIT(10),
+ .sirfsoc_rxd_brk_en = BIT(11),
+ .sirfsoc_rx_timeout_en = BIT(12),
+ .sirfsoc_parity_err_en = BIT(13),
+ .sirfsoc_cts_en = BIT(14),
+ .sirfsoc_rts_en = BIT(15),
+ },
+ .uart_int_st = {
+ .sirfsoc_rx_done = BIT(0),
+ .sirfsoc_tx_done = BIT(1),
+ .sirfsoc_rx_oflow = BIT(2),
+ .sirfsoc_tx_allout = BIT(3),
+ .sirfsoc_rx_io_dma = BIT(4),
+ .sirfsoc_tx_io_dma = BIT(5),
+ .sirfsoc_rxfifo_full = BIT(6),
+ .sirfsoc_txfifo_empty = BIT(7),
+ .sirfsoc_rxfifo_thd = BIT(8),
+ .sirfsoc_txfifo_thd = BIT(9),
+ .sirfsoc_frm_err = BIT(10),
+ .sirfsoc_rxd_brk = BIT(11),
+ .sirfsoc_rx_timeout = BIT(12),
+ .sirfsoc_parity_err = BIT(13),
+ .sirfsoc_cts = BIT(14),
+ .sirfsoc_rts = BIT(15),
+ },
+ .fifo_status = {
+ .ff_full = uart_ff_full,
+ .ff_empty = uart_ff_empty,
+ },
+ .uart_param = {
+ .uart_name = "ttySiRF",
+ .port_name = "sirfsoc_uart",
+ .uart_nr = 3,
+ .register_uart_nr = 0,
+ },
+};
+/* uart io ctrl */
#define SIRFUART_DATA_BIT_LEN_MASK 0x3
#define SIRFUART_DATA_BIT_LEN_5 BIT(0)
#define SIRFUART_DATA_BIT_LEN_6 1
@@ -50,96 +279,93 @@
#define SIRFUART_LOOP_BACK BIT(7)
#define SIRFUART_PARITY_MASK (7 << 3)
#define SIRFUART_DUMMY_READ BIT(16)
-
-#define SIRFSOC_UART_RX_TIMEOUT(br, to) (((br) * (((to) + 999) / 1000)) / 1000)
-#define SIRFUART_RECV_TIMEOUT_MASK (0xFFFF << 16)
-#define SIRFUART_RECV_TIMEOUT(x) (((x) & 0xFFFF) << 16)
-
-/* UART Auto Flow Control */
-#define SIRFUART_AFC_RX_THD_MASK 0x000000FF
+#define SIRFUART_AFC_CTRL_RX_THD 0x70
#define SIRFUART_AFC_RX_EN BIT(8)
#define SIRFUART_AFC_TX_EN BIT(9)
-#define SIRFUART_CTS_CTRL BIT(10)
-#define SIRFUART_RTS_CTRL BIT(11)
-#define SIRFUART_CTS_IN_STATUS BIT(12)
-#define SIRFUART_RTS_OUT_STATUS BIT(13)
-
-/* UART Interrupt Enable Register */
-#define SIRFUART_RX_DONE_INT BIT(0)
-#define SIRFUART_TX_DONE_INT BIT(1)
-#define SIRFUART_RX_OFLOW_INT BIT(2)
-#define SIRFUART_TX_ALLOUT_INT BIT(3)
-#define SIRFUART_RX_IO_DMA_INT BIT(4)
-#define SIRFUART_TX_IO_DMA_INT BIT(5)
-#define SIRFUART_RXFIFO_FULL_INT BIT(6)
-#define SIRFUART_TXFIFO_EMPTY_INT BIT(7)
-#define SIRFUART_RXFIFO_THD_INT BIT(8)
-#define SIRFUART_TXFIFO_THD_INT BIT(9)
-#define SIRFUART_FRM_ERR_INT BIT(10)
-#define SIRFUART_RXD_BREAK_INT BIT(11)
-#define SIRFUART_RX_TIMEOUT_INT BIT(12)
-#define SIRFUART_PARITY_ERR_INT BIT(13)
-#define SIRFUART_CTS_INT_EN BIT(14)
-#define SIRFUART_RTS_INT_EN BIT(15)
-
-/* UART Interrupt Status Register */
-#define SIRFUART_RX_DONE BIT(0)
-#define SIRFUART_TX_DONE BIT(1)
-#define SIRFUART_RX_OFLOW BIT(2)
-#define SIRFUART_TX_ALL_EMPTY BIT(3)
-#define SIRFUART_DMA_IO_RX_DONE BIT(4)
-#define SIRFUART_DMA_IO_TX_DONE BIT(5)
-#define SIRFUART_RXFIFO_FULL BIT(6)
-#define SIRFUART_TXFIFO_EMPTY BIT(7)
-#define SIRFUART_RXFIFO_THD_REACH BIT(8)
-#define SIRFUART_TXFIFO_THD_REACH BIT(9)
-#define SIRFUART_FRM_ERR BIT(10)
-#define SIRFUART_RXD_BREAK BIT(11)
-#define SIRFUART_RX_TIMEOUT BIT(12)
-#define SIRFUART_PARITY_ERR BIT(13)
-#define SIRFUART_CTS_CHANGE BIT(14)
-#define SIRFUART_RTS_CHANGE BIT(15)
-#define SIRFUART_PLUG_IN BIT(16)
-
-#define SIRFUART_ERR_INT_STAT \
- (SIRFUART_RX_OFLOW | \
- SIRFUART_FRM_ERR | \
- SIRFUART_RXD_BREAK | \
- SIRFUART_PARITY_ERR)
-#define SIRFUART_ERR_INT_EN \
- (SIRFUART_RX_OFLOW_INT | \
- SIRFUART_FRM_ERR_INT | \
- SIRFUART_RXD_BREAK_INT | \
- SIRFUART_PARITY_ERR_INT)
-#define SIRFUART_TX_INT_EN SIRFUART_TXFIFO_EMPTY_INT
-#define SIRFUART_RX_IO_INT_EN \
- (SIRFUART_RX_TIMEOUT_INT | \
- SIRFUART_RXFIFO_THD_INT | \
- SIRFUART_RXFIFO_FULL_INT | \
- SIRFUART_ERR_INT_EN)
-
+#define SIRFUART_AFC_CTS_CTRL BIT(10)
+#define SIRFUART_AFC_RTS_CTRL BIT(11)
+#define SIRFUART_AFC_CTS_STATUS BIT(12)
+#define SIRFUART_AFC_RTS_STATUS BIT(13)
/* UART FIFO Register */
-#define SIRFUART_TX_FIFO_STOP 0x0
-#define SIRFUART_TX_FIFO_RESET 0x1
-#define SIRFUART_TX_FIFO_START 0x2
-#define SIRFUART_RX_FIFO_STOP 0x0
-#define SIRFUART_RX_FIFO_RESET 0x1
-#define SIRFUART_RX_FIFO_START 0x2
-#define SIRFUART_TX_MODE_DMA 0
-#define SIRFUART_TX_MODE_IO 1
-#define SIRFUART_RX_MODE_DMA 0
-#define SIRFUART_RX_MODE_IO 1
-
-#define SIRFUART_RX_EN 0x1
-#define SIRFUART_TX_EN 0x2
+#define SIRFUART_FIFO_STOP 0x0
+#define SIRFUART_FIFO_RESET BIT(0)
+#define SIRFUART_FIFO_START BIT(1)
+#define SIRFUART_RX_EN BIT(0)
+#define SIRFUART_TX_EN BIT(1)
+
+#define SIRFUART_IO_MODE BIT(0)
+#define SIRFUART_DMA_MODE 0x0
+
+/* Macro Specific*/
+#define SIRFUART_INT_EN_CLR 0x0060
+/* Baud Rate Calculation */
+#define SIRF_MIN_SAMPLE_DIV 0xf
+#define SIRF_MAX_SAMPLE_DIV 0x3f
+#define SIRF_IOCLK_DIV_MAX 0xffff
+#define SIRF_SAMPLE_DIV_SHIFT 16
+#define SIRF_IOCLK_DIV_MASK 0xffff
+#define SIRF_SAMPLE_DIV_MASK 0x3f0000
+#define SIRF_BAUD_RATE_SUPPORT_NR 18
+
+/* USP SPEC */
+#define SIRFSOC_USP_ENDIAN_CTRL_LSBF BIT(4)
+#define SIRFSOC_USP_EN BIT(5)
+#define SIRFSOC_USP_MODE2_RXD_DELAY_OFFSET 0
+#define SIRFSOC_USP_MODE2_TXD_DELAY_OFFSET 8
+#define SIRFSOC_USP_MODE2_CLK_DIVISOR_MASK 0x3ff
+#define SIRFSOC_USP_MODE2_CLK_DIVISOR_OFFSET 21
+#define SIRFSOC_USP_TX_DATA_LEN_OFFSET 0
+#define SIRFSOC_USP_TX_SYNC_LEN_OFFSET 8
+#define SIRFSOC_USP_TX_FRAME_LEN_OFFSET 16
+#define SIRFSOC_USP_TX_SHIFTER_LEN_OFFSET 24
+#define SIRFSOC_USP_TX_CLK_DIVISOR_OFFSET 30
+#define SIRFSOC_USP_RX_DATA_LEN_OFFSET 0
+#define SIRFSOC_USP_RX_FRAME_LEN_OFFSET 8
+#define SIRFSOC_USP_RX_SHIFTER_LEN_OFFSET 16
+#define SIRFSOC_USP_RX_CLK_DIVISOR_OFFSET 24
+#define SIRFSOC_USP_ASYNC_DIV2_MASK 0x3f
+#define SIRFSOC_USP_ASYNC_DIV2_OFFSET 16
+
+/* USP-UART Common */
+#define SIRFSOC_UART_RX_TIMEOUT(br, to) (((br) * (((to) + 999) / 1000)) / 1000)
+#define SIRFUART_RECV_TIMEOUT_VALUE(x) \
+ (((x) > 0xFFFF) ? 0xFFFF : ((x) & 0xFFFF))
+#define SIRFUART_RECV_TIMEOUT(port, x) \
+ (((port)->line > 2) ? (x & 0xFFFF) : ((x) & 0xFFFF) << 16)
+
+#define SIRFUART_FIFO_THD(port) ((port->line) == 1 ? 16 : 64)
+#define SIRFUART_ERR_INT_STAT(port, unit_st) \
+ (uint_st->sirfsoc_rx_oflow | \
+ uint_st->sirfsoc_frm_err | \
+ uint_st->sirfsoc_rxd_brk | \
+ ((port->line > 2) ? 0 : uint_st->sirfsoc_parity_err))
+#define SIRFUART_RX_IO_INT_EN(port, uint_en) \
+ (uint_en->sirfsoc_rx_timeout_en |\
+ uint_en->sirfsoc_rxfifo_thd_en |\
+ uint_en->sirfsoc_rxfifo_full_en |\
+ uint_en->sirfsoc_frm_err_en |\
+ uint_en->sirfsoc_rx_oflow_en |\
+ uint_en->sirfsoc_rxd_brk_en |\
+ ((port->line > 2) ? 0 : uint_en->sirfsoc_parity_err_en))
+#define SIRFUART_RX_IO_INT_ST(uint_st) \
+ (uint_st->sirfsoc_rx_timeout |\
+ uint_st->sirfsoc_rxfifo_thd |\
+ uint_st->sirfsoc_rxfifo_full)
+#define SIRFUART_CTS_INT_ST(uint_st) (uint_st->sirfsoc_cts)
+#define SIRFUART_RX_DMA_INT_EN(port, uint_en) \
+ (uint_en->sirfsoc_rx_timeout_en |\
+ uint_en->sirfsoc_frm_err_en |\
+ uint_en->sirfsoc_rx_oflow_en |\
+ uint_en->sirfsoc_rxd_brk_en |\
+ ((port->line > 2) ? 0 : uint_en->sirfsoc_parity_err_en))
/* Generic Definitions */
#define SIRFSOC_UART_NAME "ttySiRF"
#define SIRFSOC_UART_MAJOR 0
#define SIRFSOC_UART_MINOR 0
#define SIRFUART_PORT_NAME "sirfsoc-uart"
#define SIRFUART_MAP_SIZE 0x200
-#define SIRFSOC_UART_NR 5
+#define SIRFSOC_UART_NR 6
#define SIRFSOC_PORT_TYPE 0xa5
/* Baud Rate Calculation */
@@ -151,19 +377,80 @@
#define SIRF_SAMPLE_DIV_MASK 0x3f0000
#define SIRF_BAUD_RATE_SUPPORT_NR 18
+/* Uart Common Use Macro*/
+#define SIRFSOC_RX_DMA_BUF_SIZE 256
+#define BYTES_TO_ALIGN(dma_addr) ((unsigned long)(dma_addr) & 0x3)
+#define LOOP_DMA_BUFA_FILL 1
+#define LOOP_DMA_BUFB_FILL 2
+#define TX_TRAN_PIO 1
+#define TX_TRAN_DMA 2
+/* Uart Fifo Level Chk */
+#define SIRFUART_TX_FIFO_SC_OFFSET 0
+#define SIRFUART_TX_FIFO_LC_OFFSET 10
+#define SIRFUART_TX_FIFO_HC_OFFSET 20
+#define SIRFUART_TX_FIFO_CHK_SC(line, value) ((((line) == 1) ? (value & 0x3) :\
+ (value & 0x1f)) << SIRFUART_TX_FIFO_SC_OFFSET)
+#define SIRFUART_TX_FIFO_CHK_LC(line, value) ((((line) == 1) ? (value & 0x3) :\
+ (value & 0x1f)) << SIRFUART_TX_FIFO_LC_OFFSET)
+#define SIRFUART_TX_FIFO_CHK_HC(line, value) ((((line) == 1) ? (value & 0x3) :\
+ (value & 0x1f)) << SIRFUART_TX_FIFO_HC_OFFSET)
+
+#define SIRFUART_RX_FIFO_CHK_SC SIRFUART_TX_FIFO_CHK_SC
+#define SIRFUART_RX_FIFO_CHK_LC SIRFUART_TX_FIFO_CHK_LC
+#define SIRFUART_RX_FIFO_CHK_HC SIRFUART_TX_FIFO_CHK_HC
+/* Indicate how many buffers used */
+#define SIRFSOC_RX_LOOP_BUF_CNT 2
+
+/* Indicate if DMA channel valid */
+#define IS_DMA_CHAN_VALID(x) ((x) != -1)
+#define UNVALID_DMA_CHAN -1
/* For Fast Baud Rate Calculation */
struct sirfsoc_baudrate_to_regv {
unsigned int baud_rate;
unsigned int reg_val;
};
+enum sirfsoc_tx_state {
+ TX_DMA_IDLE,
+ TX_DMA_RUNNING,
+ TX_DMA_PAUSE,
+};
+
+struct sirfsoc_loop_buffer {
+ struct circ_buf xmit;
+ dma_cookie_t cookie;
+ struct dma_async_tx_descriptor *desc;
+ dma_addr_t dma_addr;
+};
+
struct sirfsoc_uart_port {
- unsigned char hw_flow_ctrl;
- unsigned char ms_enabled;
+ bool hw_flow_ctrl;
+ bool ms_enabled;
struct uart_port port;
- struct pinctrl *p;
struct clk *clk;
+ /* for SiRFmarco, there are SET/CLR for UART_INT_EN */
+ bool is_marco;
+ struct sirfsoc_uart_register *uart_reg;
+ int rx_dma_no;
+ int tx_dma_no;
+ struct dma_chan *rx_dma_chan;
+ struct dma_chan *tx_dma_chan;
+ dma_addr_t tx_dma_addr;
+ struct dma_async_tx_descriptor *tx_dma_desc;
+ spinlock_t rx_lock;
+ spinlock_t tx_lock;
+ struct tasklet_struct rx_dma_complete_tasklet;
+ struct tasklet_struct rx_tmo_process_tasklet;
+ unsigned int rx_io_count;
+ unsigned long transfer_size;
+ enum sirfsoc_tx_state tx_dma_state;
+ unsigned int cts_gpio;
+ unsigned int rts_gpio;
+
+ struct sirfsoc_loop_buffer rx_dma_items[SIRFSOC_RX_LOOP_BUF_CNT];
+ int rx_completed;
+ int rx_issued;
};
/* Hardware Flow Control */
diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c
new file mode 100644
index 0000000..21e6e84
--- /dev/null
+++ b/drivers/tty/serial/st-asc.c
@@ -0,0 +1,932 @@
+/*
+ * st-asc.c: ST Asynchronous serial controller (ASC) driver
+ *
+ * Copyright (C) 2003-2013 STMicroelectronics (R&D) Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#if defined(CONFIG_SERIAL_ST_ASC_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/module.h>
+#include <linux/serial.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/serial_core.h>
+#include <linux/clk.h>
+
+#define DRIVER_NAME "st-asc"
+#define ASC_SERIAL_NAME "ttyAS"
+#define ASC_FIFO_SIZE 16
+#define ASC_MAX_PORTS 8
+
+struct asc_port {
+ struct uart_port port;
+ struct clk *clk;
+ unsigned int hw_flow_control:1;
+ unsigned int force_m1:1;
+};
+
+static struct asc_port asc_ports[ASC_MAX_PORTS];
+static struct uart_driver asc_uart_driver;
+
+/*---- UART Register definitions ------------------------------*/
+
+/* Register offsets */
+
+#define ASC_BAUDRATE 0x00
+#define ASC_TXBUF 0x04
+#define ASC_RXBUF 0x08
+#define ASC_CTL 0x0C
+#define ASC_INTEN 0x10
+#define ASC_STA 0x14
+#define ASC_GUARDTIME 0x18
+#define ASC_TIMEOUT 0x1C
+#define ASC_TXRESET 0x20
+#define ASC_RXRESET 0x24
+#define ASC_RETRIES 0x28
+
+/* ASC_RXBUF */
+#define ASC_RXBUF_PE 0x100
+#define ASC_RXBUF_FE 0x200
+/**
+ * Some of status comes from higher bits of the character and some come from
+ * the status register. Combining both of them in to single status using dummy
+ * bits.
+ */
+#define ASC_RXBUF_DUMMY_RX 0x10000
+#define ASC_RXBUF_DUMMY_BE 0x20000
+#define ASC_RXBUF_DUMMY_OE 0x40000
+
+/* ASC_CTL */
+
+#define ASC_CTL_MODE_MSK 0x0007
+#define ASC_CTL_MODE_8BIT 0x0001
+#define ASC_CTL_MODE_7BIT_PAR 0x0003
+#define ASC_CTL_MODE_9BIT 0x0004
+#define ASC_CTL_MODE_8BIT_WKUP 0x0005
+#define ASC_CTL_MODE_8BIT_PAR 0x0007
+#define ASC_CTL_STOP_MSK 0x0018
+#define ASC_CTL_STOP_HALFBIT 0x0000
+#define ASC_CTL_STOP_1BIT 0x0008
+#define ASC_CTL_STOP_1_HALFBIT 0x0010
+#define ASC_CTL_STOP_2BIT 0x0018
+#define ASC_CTL_PARITYODD 0x0020
+#define ASC_CTL_LOOPBACK 0x0040
+#define ASC_CTL_RUN 0x0080
+#define ASC_CTL_RXENABLE 0x0100
+#define ASC_CTL_SCENABLE 0x0200
+#define ASC_CTL_FIFOENABLE 0x0400
+#define ASC_CTL_CTSENABLE 0x0800
+#define ASC_CTL_BAUDMODE 0x1000
+
+/* ASC_GUARDTIME */
+
+#define ASC_GUARDTIME_MSK 0x00FF
+
+/* ASC_INTEN */
+
+#define ASC_INTEN_RBE 0x0001
+#define ASC_INTEN_TE 0x0002
+#define ASC_INTEN_THE 0x0004
+#define ASC_INTEN_PE 0x0008
+#define ASC_INTEN_FE 0x0010
+#define ASC_INTEN_OE 0x0020
+#define ASC_INTEN_TNE 0x0040
+#define ASC_INTEN_TOI 0x0080
+#define ASC_INTEN_RHF 0x0100
+
+/* ASC_RETRIES */
+
+#define ASC_RETRIES_MSK 0x00FF
+
+/* ASC_RXBUF */
+
+#define ASC_RXBUF_MSK 0x03FF
+
+/* ASC_STA */
+
+#define ASC_STA_RBF 0x0001
+#define ASC_STA_TE 0x0002
+#define ASC_STA_THE 0x0004
+#define ASC_STA_PE 0x0008
+#define ASC_STA_FE 0x0010
+#define ASC_STA_OE 0x0020
+#define ASC_STA_TNE 0x0040
+#define ASC_STA_TOI 0x0080
+#define ASC_STA_RHF 0x0100
+#define ASC_STA_TF 0x0200
+#define ASC_STA_NKD 0x0400
+
+/* ASC_TIMEOUT */
+
+#define ASC_TIMEOUT_MSK 0x00FF
+
+/* ASC_TXBUF */
+
+#define ASC_TXBUF_MSK 0x01FF
+
+/*---- Inline function definitions ---------------------------*/
+
+static inline struct asc_port *to_asc_port(struct uart_port *port)
+{
+ return container_of(port, struct asc_port, port);
+}
+
+static inline u32 asc_in(struct uart_port *port, u32 offset)
+{
+ return readl(port->membase + offset);
+}
+
+static inline void asc_out(struct uart_port *port, u32 offset, u32 value)
+{
+ writel(value, port->membase + offset);
+}
+
+/*
+ * Some simple utility functions to enable and disable interrupts.
+ * Note that these need to be called with interrupts disabled.
+ */
+static inline void asc_disable_tx_interrupts(struct uart_port *port)
+{
+ u32 intenable = asc_in(port, ASC_INTEN) & ~ASC_INTEN_THE;
+ asc_out(port, ASC_INTEN, intenable);
+ (void)asc_in(port, ASC_INTEN); /* Defeat bus write posting */
+}
+
+static inline void asc_enable_tx_interrupts(struct uart_port *port)
+{
+ u32 intenable = asc_in(port, ASC_INTEN) | ASC_INTEN_THE;
+ asc_out(port, ASC_INTEN, intenable);
+}
+
+static inline void asc_disable_rx_interrupts(struct uart_port *port)
+{
+ u32 intenable = asc_in(port, ASC_INTEN) & ~ASC_INTEN_RBE;
+ asc_out(port, ASC_INTEN, intenable);
+ (void)asc_in(port, ASC_INTEN); /* Defeat bus write posting */
+}
+
+static inline void asc_enable_rx_interrupts(struct uart_port *port)
+{
+ u32 intenable = asc_in(port, ASC_INTEN) | ASC_INTEN_RBE;
+ asc_out(port, ASC_INTEN, intenable);
+}
+
+static inline u32 asc_txfifo_is_empty(struct uart_port *port)
+{
+ return asc_in(port, ASC_STA) & ASC_STA_TE;
+}
+
+static inline int asc_txfifo_is_full(struct uart_port *port)
+{
+ return asc_in(port, ASC_STA) & ASC_STA_TF;
+}
+
+static inline const char *asc_port_name(struct uart_port *port)
+{
+ return to_platform_device(port->dev)->name;
+}
+
+/*----------------------------------------------------------------------*/
+
+/*
+ * This section contains code to support the use of the ASC as a
+ * generic serial port.
+ */
+
+static inline unsigned asc_hw_txroom(struct uart_port *port)
+{
+ u32 status = asc_in(port, ASC_STA);
+
+ if (status & ASC_STA_THE)
+ return port->fifosize / 2;
+ else if (!(status & ASC_STA_TF))
+ return 1;
+
+ return 0;
+}
+
+/*
+ * Start transmitting chars.
+ * This is called from both interrupt and task level.
+ * Either way interrupts are disabled.
+ */
+static void asc_transmit_chars(struct uart_port *port)
+{
+ struct circ_buf *xmit = &port->state->xmit;
+ int txroom;
+ unsigned char c;
+
+ txroom = asc_hw_txroom(port);
+
+ if ((txroom != 0) && port->x_char) {
+ c = port->x_char;
+ port->x_char = 0;
+ asc_out(port, ASC_TXBUF, c);
+ port->icount.tx++;
+ txroom = asc_hw_txroom(port);
+ }
+
+ if (uart_tx_stopped(port)) {
+ /*
+ * We should try and stop the hardware here, but I
+ * don't think the ASC has any way to do that.
+ */
+ asc_disable_tx_interrupts(port);
+ return;
+ }
+
+ if (uart_circ_empty(xmit)) {
+ asc_disable_tx_interrupts(port);
+ return;
+ }
+
+ if (txroom == 0)
+ return;
+
+ do {
+ c = xmit->buf[xmit->tail];
+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+ asc_out(port, ASC_TXBUF, c);
+ port->icount.tx++;
+ txroom--;
+ } while ((txroom > 0) && (!uart_circ_empty(xmit)));
+
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(port);
+
+ if (uart_circ_empty(xmit))
+ asc_disable_tx_interrupts(port);
+}
+
+static void asc_receive_chars(struct uart_port *port)
+{
+ struct tty_port *tport = &port->state->port;
+ unsigned long status;
+ unsigned long c = 0;
+ char flag;
+
+ if (port->irq_wake)
+ pm_wakeup_event(tport->tty->dev, 0);
+
+ while ((status = asc_in(port, ASC_STA)) & ASC_STA_RBF) {
+ c = asc_in(port, ASC_RXBUF) | ASC_RXBUF_DUMMY_RX;
+ flag = TTY_NORMAL;
+ port->icount.rx++;
+
+ if ((c & (ASC_RXBUF_FE | ASC_RXBUF_PE)) ||
+ status & ASC_STA_OE) {
+
+ if (c & ASC_RXBUF_FE) {
+ if (c == ASC_RXBUF_FE) {
+ port->icount.brk++;
+ if (uart_handle_break(port))
+ continue;
+ c |= ASC_RXBUF_DUMMY_BE;
+ } else {
+ port->icount.frame++;
+ }
+ } else if (c & ASC_RXBUF_PE) {
+ port->icount.parity++;
+ }
+ /*
+ * Reading any data from the RX FIFO clears the
+ * overflow error condition.
+ */
+ if (status & ASC_STA_OE) {
+ port->icount.overrun++;
+ c |= ASC_RXBUF_DUMMY_OE;
+ }
+
+ c &= port->read_status_mask;
+
+ if (c & ASC_RXBUF_DUMMY_BE)
+ flag = TTY_BREAK;
+ else if (c & ASC_RXBUF_PE)
+ flag = TTY_PARITY;
+ else if (c & ASC_RXBUF_FE)
+ flag = TTY_FRAME;
+ }
+
+ if (uart_handle_sysrq_char(port, c))
+ continue;
+
+ uart_insert_char(port, c, ASC_RXBUF_DUMMY_OE, c & 0xff, flag);
+ }
+
+ /* Tell the rest of the system the news. New characters! */
+ tty_flip_buffer_push(tport);
+}
+
+static irqreturn_t asc_interrupt(int irq, void *ptr)
+{
+ struct uart_port *port = ptr;
+ u32 status;
+
+ spin_lock(&port->lock);
+
+ status = asc_in(port, ASC_STA);
+
+ if (status & ASC_STA_RBF) {
+ /* Receive FIFO not empty */
+ asc_receive_chars(port);
+ }
+
+ if ((status & ASC_STA_THE) &&
+ (asc_in(port, ASC_INTEN) & ASC_INTEN_THE)) {
+ /* Transmitter FIFO at least half empty */
+ asc_transmit_chars(port);
+ }
+
+ spin_unlock(&port->lock);
+
+ return IRQ_HANDLED;
+}
+
+/*----------------------------------------------------------------------*/
+
+/*
+ * UART Functions
+ */
+
+static unsigned int asc_tx_empty(struct uart_port *port)
+{
+ return asc_txfifo_is_empty(port) ? TIOCSER_TEMT : 0;
+}
+
+static void asc_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+ /*
+ * This routine is used for seting signals of: DTR, DCD, CTS/RTS
+ * We use ASC's hardware for CTS/RTS, so don't need any for that.
+ * Some boards have DTR and DCD implemented using PIO pins,
+ * code to do this should be hooked in here.
+ */
+}
+
+static unsigned int asc_get_mctrl(struct uart_port *port)
+{
+ /*
+ * This routine is used for geting signals of: DTR, DCD, DSR, RI,
+ * and CTS/RTS
+ */
+ return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
+}
+
+/* There are probably characters waiting to be transmitted. */
+static void asc_start_tx(struct uart_port *port)
+{
+ struct circ_buf *xmit = &port->state->xmit;
+
+ if (!uart_circ_empty(xmit))
+ asc_enable_tx_interrupts(port);
+}
+
+/* Transmit stop */
+static void asc_stop_tx(struct uart_port *port)
+{
+ asc_disable_tx_interrupts(port);
+}
+
+/* Receive stop */
+static void asc_stop_rx(struct uart_port *port)
+{
+ asc_disable_rx_interrupts(port);
+}
+
+/* Force modem status interrupts on */
+static void asc_enable_ms(struct uart_port *port)
+{
+ /* Nothing here yet .. */
+}
+
+/* Handle breaks - ignored by us */
+static void asc_break_ctl(struct uart_port *port, int break_state)
+{
+ /* Nothing here yet .. */
+}
+
+/*
+ * Enable port for reception.
+ */
+static int asc_startup(struct uart_port *port)
+{
+ if (request_irq(port->irq, asc_interrupt, IRQF_NO_SUSPEND,
+ asc_port_name(port), port)) {
+ dev_err(port->dev, "cannot allocate irq.\n");
+ return -ENODEV;
+ }
+
+ asc_transmit_chars(port);
+ asc_enable_rx_interrupts(port);
+
+ return 0;
+}
+
+static void asc_shutdown(struct uart_port *port)
+{
+ asc_disable_tx_interrupts(port);
+ asc_disable_rx_interrupts(port);
+ free_irq(port->irq, port);
+}
+
+static void asc_pm(struct uart_port *port, unsigned int state,
+ unsigned int oldstate)
+{
+ struct asc_port *ascport = to_asc_port(port);
+ unsigned long flags = 0;
+ u32 ctl;
+
+ switch (state) {
+ case UART_PM_STATE_ON:
+ clk_prepare_enable(ascport->clk);
+ break;
+ case UART_PM_STATE_OFF:
+ /*
+ * Disable the ASC baud rate generator, which is as close as
+ * we can come to turning it off. Note this is not called with
+ * the port spinlock held.
+ */
+ spin_lock_irqsave(&port->lock, flags);
+ ctl = asc_in(port, ASC_CTL) & ~ASC_CTL_RUN;
+ asc_out(port, ASC_CTL, ctl);
+ spin_unlock_irqrestore(&port->lock, flags);
+ clk_disable_unprepare(ascport->clk);
+ break;
+ }
+}
+
+static void asc_set_termios(struct uart_port *port, struct ktermios *termios,
+ struct ktermios *old)
+{
+ struct asc_port *ascport = to_asc_port(port);
+ unsigned int baud;
+ u32 ctrl_val;
+ tcflag_t cflag;
+ unsigned long flags;
+
+ /* Update termios to reflect hardware capabilities */
+ termios->c_cflag &= ~(CMSPAR |
+ (ascport->hw_flow_control ? 0 : CRTSCTS));
+
+ port->uartclk = clk_get_rate(ascport->clk);
+
+ baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
+ cflag = termios->c_cflag;
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ /* read control register */
+ ctrl_val = asc_in(port, ASC_CTL);
+
+ /* stop serial port and reset value */
+ asc_out(port, ASC_CTL, (ctrl_val & ~ASC_CTL_RUN));
+ ctrl_val = ASC_CTL_RXENABLE | ASC_CTL_FIFOENABLE;
+
+ /* reset fifo rx & tx */
+ asc_out(port, ASC_TXRESET, 1);
+ asc_out(port, ASC_RXRESET, 1);
+
+ /* set character length */
+ if ((cflag & CSIZE) == CS7) {
+ ctrl_val |= ASC_CTL_MODE_7BIT_PAR;
+ } else {
+ ctrl_val |= (cflag & PARENB) ? ASC_CTL_MODE_8BIT_PAR :
+ ASC_CTL_MODE_8BIT;
+ }
+
+ /* set stop bit */
+ ctrl_val |= (cflag & CSTOPB) ? ASC_CTL_STOP_2BIT : ASC_CTL_STOP_1BIT;
+
+ /* odd parity */
+ if (cflag & PARODD)
+ ctrl_val |= ASC_CTL_PARITYODD;
+
+ /* hardware flow control */
+ if ((cflag & CRTSCTS))
+ ctrl_val |= ASC_CTL_CTSENABLE;
+
+ if ((baud < 19200) && !ascport->force_m1) {
+ asc_out(port, ASC_BAUDRATE, (port->uartclk / (16 * baud)));
+ } else {
+ /*
+ * MODE 1: recommended for high bit rates (above 19.2K)
+ *
+ * baudrate * 16 * 2^16
+ * ASCBaudRate = ------------------------
+ * inputclock
+ *
+ * However to keep the maths inside 32bits we divide top and
+ * bottom by 64. The +1 is to avoid a divide by zero if the
+ * input clock rate is something unexpected.
+ */
+ u32 counter = (baud * 16384) / ((port->uartclk / 64) + 1);
+ asc_out(port, ASC_BAUDRATE, counter);
+ ctrl_val |= ASC_CTL_BAUDMODE;
+ }
+
+ uart_update_timeout(port, cflag, baud);
+
+ ascport->port.read_status_mask = ASC_RXBUF_DUMMY_OE;
+ if (termios->c_iflag & INPCK)
+ ascport->port.read_status_mask |= ASC_RXBUF_FE | ASC_RXBUF_PE;
+ if (termios->c_iflag & (BRKINT | PARMRK))
+ ascport->port.read_status_mask |= ASC_RXBUF_DUMMY_BE;
+
+ /*
+ * Characters to ignore
+ */
+ ascport->port.ignore_status_mask = 0;
+ if (termios->c_iflag & IGNPAR)
+ ascport->port.ignore_status_mask |= ASC_RXBUF_FE | ASC_RXBUF_PE;
+ if (termios->c_iflag & IGNBRK) {
+ ascport->port.ignore_status_mask |= ASC_RXBUF_DUMMY_BE;
+ /*
+ * If we're ignoring parity and break indicators,
+ * ignore overruns too (for real raw support).
+ */
+ if (termios->c_iflag & IGNPAR)
+ ascport->port.ignore_status_mask |= ASC_RXBUF_DUMMY_OE;
+ }
+
+ /*
+ * Ignore all characters if CREAD is not set.
+ */
+ if (!(termios->c_cflag & CREAD))
+ ascport->port.ignore_status_mask |= ASC_RXBUF_DUMMY_RX;
+
+ /* Set the timeout */
+ asc_out(port, ASC_TIMEOUT, 20);
+
+ /* write final value and enable port */
+ asc_out(port, ASC_CTL, (ctrl_val | ASC_CTL_RUN));
+
+ spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *asc_type(struct uart_port *port)
+{
+ return (port->type == PORT_ASC) ? DRIVER_NAME : NULL;
+}
+
+static void asc_release_port(struct uart_port *port)
+{
+}
+
+static int asc_request_port(struct uart_port *port)
+{
+ return 0;
+}
+
+/*
+ * Called when the port is opened, and UPF_BOOT_AUTOCONF flag is set
+ * Set type field if successful
+ */
+static void asc_config_port(struct uart_port *port, int flags)
+{
+ if ((flags & UART_CONFIG_TYPE))
+ port->type = PORT_ASC;
+}
+
+static int
+asc_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+ /* No user changeable parameters */
+ return -EINVAL;
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+/*
+ * Console polling routines for writing and reading from the uart while
+ * in an interrupt or debug context (i.e. kgdb).
+ */
+
+static int asc_get_poll_char(struct uart_port *port)
+{
+ if (!(asc_in(port, ASC_STA) & ASC_STA_RBF))
+ return NO_POLL_CHAR;
+
+ return asc_in(port, ASC_RXBUF);
+}
+
+static void asc_put_poll_char(struct uart_port *port, unsigned char c)
+{
+ while (asc_txfifo_is_full(port))
+ cpu_relax();
+ asc_out(port, ASC_TXBUF, c);
+}
+
+#endif /* CONFIG_CONSOLE_POLL */
+
+/*---------------------------------------------------------------------*/
+
+static struct uart_ops asc_uart_ops = {
+ .tx_empty = asc_tx_empty,
+ .set_mctrl = asc_set_mctrl,
+ .get_mctrl = asc_get_mctrl,
+ .start_tx = asc_start_tx,
+ .stop_tx = asc_stop_tx,
+ .stop_rx = asc_stop_rx,
+ .enable_ms = asc_enable_ms,
+ .break_ctl = asc_break_ctl,
+ .startup = asc_startup,
+ .shutdown = asc_shutdown,
+ .set_termios = asc_set_termios,
+ .type = asc_type,
+ .release_port = asc_release_port,
+ .request_port = asc_request_port,
+ .config_port = asc_config_port,
+ .verify_port = asc_verify_port,
+ .pm = asc_pm,
+#ifdef CONFIG_CONSOLE_POLL
+ .poll_get_char = asc_get_poll_char,
+ .poll_put_char = asc_put_poll_char,
+#endif /* CONFIG_CONSOLE_POLL */
+};
+
+static int asc_init_port(struct asc_port *ascport,
+ struct platform_device *pdev)
+{
+ struct uart_port *port = &ascport->port;
+ struct resource *res;
+
+ port->iotype = UPIO_MEM;
+ port->flags = UPF_BOOT_AUTOCONF;
+ port->ops = &asc_uart_ops;
+ port->fifosize = ASC_FIFO_SIZE;
+ port->dev = &pdev->dev;
+ port->irq = platform_get_irq(pdev, 0);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ port->membase = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(port->membase))
+ return PTR_ERR(port->membase);
+ port->mapbase = res->start;
+
+ spin_lock_init(&port->lock);
+
+ ascport->clk = devm_clk_get(&pdev->dev, NULL);
+
+ if (WARN_ON(IS_ERR(ascport->clk)))
+ return -EINVAL;
+ /* ensure that clk rate is correct by enabling the clk */
+ clk_prepare_enable(ascport->clk);
+ ascport->port.uartclk = clk_get_rate(ascport->clk);
+ WARN_ON(ascport->port.uartclk == 0);
+ clk_disable_unprepare(ascport->clk);
+
+ return 0;
+}
+
+static struct asc_port *asc_of_get_asc_port(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ int id;
+
+ if (!np)
+ return NULL;
+
+ id = of_alias_get_id(np, ASC_SERIAL_NAME);
+
+ if (id < 0)
+ id = 0;
+
+ if (WARN_ON(id >= ASC_MAX_PORTS))
+ return NULL;
+
+ asc_ports[id].hw_flow_control = of_property_read_bool(np,
+ "st,hw-flow-control");
+ asc_ports[id].force_m1 = of_property_read_bool(np, "st,force_m1");
+ asc_ports[id].port.line = id;
+ return &asc_ports[id];
+}
+
+#ifdef CONFIG_OF
+static struct of_device_id asc_match[] = {
+ { .compatible = "st,asc", },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, asc_match);
+#endif
+
+static int asc_serial_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct asc_port *ascport;
+
+ ascport = asc_of_get_asc_port(pdev);
+ if (!ascport)
+ return -ENODEV;
+
+ ret = asc_init_port(ascport, pdev);
+ if (ret)
+ return ret;
+
+ ret = uart_add_one_port(&asc_uart_driver, &ascport->port);
+ if (ret)
+ return ret;
+
+ platform_set_drvdata(pdev, &ascport->port);
+
+ return 0;
+}
+
+static int asc_serial_remove(struct platform_device *pdev)
+{
+ struct uart_port *port = platform_get_drvdata(pdev);
+
+ return uart_remove_one_port(&asc_uart_driver, port);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int asc_serial_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct uart_port *port = platform_get_drvdata(pdev);
+
+ return uart_suspend_port(&asc_uart_driver, port);
+}
+
+static int asc_serial_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct uart_port *port = platform_get_drvdata(pdev);
+
+ return uart_resume_port(&asc_uart_driver, port);
+}
+
+#endif /* CONFIG_PM_SLEEP */
+
+/*----------------------------------------------------------------------*/
+
+#ifdef CONFIG_SERIAL_ST_ASC_CONSOLE
+static void asc_console_putchar(struct uart_port *port, int ch)
+{
+ unsigned int timeout = 1000000;
+
+ /* Wait for upto 1 second in case flow control is stopping us. */
+ while (--timeout && asc_txfifo_is_full(port))
+ udelay(1);
+
+ asc_out(port, ASC_TXBUF, ch);
+}
+
+/*
+ * Print a string to the serial port trying not to disturb
+ * any possible real use of the port...
+ */
+
+static void asc_console_write(struct console *co, const char *s, unsigned count)
+{
+ struct uart_port *port = &asc_ports[co->index].port;
+ unsigned long flags;
+ unsigned long timeout = 1000000;
+ int locked = 1;
+ u32 intenable;
+
+ local_irq_save(flags);
+ if (port->sysrq)
+ locked = 0; /* asc_interrupt has already claimed the lock */
+ else if (oops_in_progress)
+ locked = spin_trylock(&port->lock);
+ else
+ spin_lock(&port->lock);
+
+ /*
+ * Disable interrupts so we don't get the IRQ line bouncing
+ * up and down while interrupts are disabled.
+ */
+ intenable = asc_in(port, ASC_INTEN);
+ asc_out(port, ASC_INTEN, 0);
+ (void)asc_in(port, ASC_INTEN); /* Defeat bus write posting */
+
+ uart_console_write(port, s, count, asc_console_putchar);
+
+ while (--timeout && !asc_txfifo_is_empty(port))
+ udelay(1);
+
+ asc_out(port, ASC_INTEN, intenable);
+
+ if (locked)
+ spin_unlock(&port->lock);
+ local_irq_restore(flags);
+}
+
+static int asc_console_setup(struct console *co, char *options)
+{
+ struct asc_port *ascport;
+ int baud = 9600;
+ int bits = 8;
+ int parity = 'n';
+ int flow = 'n';
+
+ if (co->index >= ASC_MAX_PORTS)
+ return -ENODEV;
+
+ ascport = &asc_ports[co->index];
+
+ /*
+ * This driver does not support early console initialization
+ * (use ARM early printk support instead), so we only expect
+ * this to be called during the uart port registration when the
+ * driver gets probed and the port should be mapped at that point.
+ */
+ BUG_ON(ascport->port.mapbase == 0 || ascport->port.membase == NULL);
+
+ if (options)
+ uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+ return uart_set_options(&ascport->port, co, baud, parity, bits, flow);
+}
+
+static struct console asc_console = {
+ .name = ASC_SERIAL_NAME,
+ .device = uart_console_device,
+ .write = asc_console_write,
+ .setup = asc_console_setup,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+ .data = &asc_uart_driver,
+};
+
+#define ASC_SERIAL_CONSOLE (&asc_console)
+
+#else
+#define ASC_SERIAL_CONSOLE NULL
+#endif /* CONFIG_SERIAL_ST_ASC_CONSOLE */
+
+static struct uart_driver asc_uart_driver = {
+ .owner = THIS_MODULE,
+ .driver_name = DRIVER_NAME,
+ .dev_name = ASC_SERIAL_NAME,
+ .major = 0,
+ .minor = 0,
+ .nr = ASC_MAX_PORTS,
+ .cons = ASC_SERIAL_CONSOLE,
+};
+
+static const struct dev_pm_ops asc_serial_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(asc_serial_suspend, asc_serial_resume)
+};
+
+static struct platform_driver asc_serial_driver = {
+ .probe = asc_serial_probe,
+ .remove = asc_serial_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ .pm = &asc_serial_pm_ops,
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(asc_match),
+ },
+};
+
+static int __init asc_init(void)
+{
+ int ret;
+ static char banner[] __initdata =
+ KERN_INFO "STMicroelectronics ASC driver initialized\n";
+
+ printk(banner);
+
+ ret = uart_register_driver(&asc_uart_driver);
+ if (ret)
+ return ret;
+
+ ret = platform_driver_register(&asc_serial_driver);
+ if (ret)
+ uart_unregister_driver(&asc_uart_driver);
+
+ return ret;
+}
+
+static void __exit asc_exit(void)
+{
+ platform_driver_unregister(&asc_serial_driver);
+ uart_unregister_driver(&asc_uart_driver);
+}
+
+module_init(asc_init);
+module_exit(asc_exit);
+
+MODULE_ALIAS("platform:" DRIVER_NAME);
+MODULE_AUTHOR("STMicroelectronics (R&D) Limited");
+MODULE_DESCRIPTION("STMicroelectronics ASC serial port driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/timbuart.c b/drivers/tty/serial/timbuart.c
index 6818410..f87097a 100644
--- a/drivers/tty/serial/timbuart.c
+++ b/drivers/tty/serial/timbuart.c
@@ -162,7 +162,7 @@ static void timbuart_handle_tx_port(struct uart_port *port, u32 isr, u32 *ier)
dev_dbg(port->dev, "%s - leaving\n", __func__);
}
-void timbuart_handle_rx_port(struct uart_port *port, u32 isr, u32 *ier)
+static void timbuart_handle_rx_port(struct uart_port *port, u32 isr, u32 *ier)
{
if (isr & RXFLAGS) {
/* Some RX status is set */
@@ -184,7 +184,7 @@ void timbuart_handle_rx_port(struct uart_port *port, u32 isr, u32 *ier)
dev_dbg(port->dev, "%s - leaving\n", __func__);
}
-void timbuart_tasklet(unsigned long arg)
+static void timbuart_tasklet(unsigned long arg)
{
struct timbuart_port *uart = (struct timbuart_port *)arg;
u32 isr, ier = 0;
diff --git a/drivers/tty/serial/vr41xx_siu.c b/drivers/tty/serial/vr41xx_siu.c
index f655997..a63c14b 100644
--- a/drivers/tty/serial/vr41xx_siu.c
+++ b/drivers/tty/serial/vr41xx_siu.c
@@ -705,7 +705,7 @@ static int siu_init_ports(struct platform_device *pdev)
{
struct uart_port *port;
struct resource *res;
- int *type = pdev->dev.platform_data;
+ int *type = dev_get_platdata(&pdev->dev);
int i;
if (!type)
diff --git a/drivers/tty/serial/vt8500_serial.c b/drivers/tty/serial/vt8500_serial.c
index 48af43d..93b697a 100644
--- a/drivers/tty/serial/vt8500_serial.c
+++ b/drivers/tty/serial/vt8500_serial.c
@@ -170,7 +170,9 @@ static void handle_rx(struct uart_port *port)
tty_insert_flip_char(tport, c, flag);
}
+ spin_unlock(&port->lock);
tty_flip_buffer_push(tport);
+ spin_lock(&port->lock);
}
static void handle_tx(struct uart_port *port)
@@ -630,7 +632,6 @@ static int vt8500_serial_remove(struct platform_device *pdev)
{
struct vt8500_port *vt8500_port = platform_get_drvdata(pdev);
- platform_set_drvdata(pdev, NULL);
clk_disable_unprepare(vt8500_port->clk);
uart_remove_one_port(&vt8500_uart_driver, &vt8500_port->uart);
diff --git a/drivers/tty/synclink.c b/drivers/tty/synclink.c
index 8eaf1ab..e1ce141 100644
--- a/drivers/tty/synclink.c
+++ b/drivers/tty/synclink.c
@@ -577,22 +577,22 @@ struct mgsl_struct {
#define SICR_RXC_ACTIVE BIT15
#define SICR_RXC_INACTIVE BIT14
-#define SICR_RXC (BIT15+BIT14)
+#define SICR_RXC (BIT15|BIT14)
#define SICR_TXC_ACTIVE BIT13
#define SICR_TXC_INACTIVE BIT12
-#define SICR_TXC (BIT13+BIT12)
+#define SICR_TXC (BIT13|BIT12)
#define SICR_RI_ACTIVE BIT11
#define SICR_RI_INACTIVE BIT10
-#define SICR_RI (BIT11+BIT10)
+#define SICR_RI (BIT11|BIT10)
#define SICR_DSR_ACTIVE BIT9
#define SICR_DSR_INACTIVE BIT8
-#define SICR_DSR (BIT9+BIT8)
+#define SICR_DSR (BIT9|BIT8)
#define SICR_DCD_ACTIVE BIT7
#define SICR_DCD_INACTIVE BIT6
-#define SICR_DCD (BIT7+BIT6)
+#define SICR_DCD (BIT7|BIT6)
#define SICR_CTS_ACTIVE BIT5
#define SICR_CTS_INACTIVE BIT4
-#define SICR_CTS (BIT5+BIT4)
+#define SICR_CTS (BIT5|BIT4)
#define SICR_RCC_UNDERFLOW BIT3
#define SICR_DPLL_NO_SYNC BIT2
#define SICR_BRG1_ZERO BIT1
@@ -1161,7 +1161,7 @@ static void mgsl_isr_receive_status( struct mgsl_struct *info )
{
u16 status = usc_InReg( info, RCSR );
- if ( debug_level >= DEBUG_LEVEL_ISR )
+ if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s(%d):mgsl_isr_receive_status status=%04X\n",
__FILE__,__LINE__,status);
@@ -1181,7 +1181,7 @@ static void mgsl_isr_receive_status( struct mgsl_struct *info )
(usc_InReg(info, RICR) & ~RXSTATUS_ABORT_RECEIVED));
}
- if (status & (RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED)) {
+ if (status & (RXSTATUS_EXITED_HUNT | RXSTATUS_IDLE_RECEIVED)) {
if (status & RXSTATUS_EXITED_HUNT)
info->icount.exithunt++;
if (status & RXSTATUS_IDLE_RECEIVED)
@@ -1463,21 +1463,21 @@ static void mgsl_isr_receive_data( struct mgsl_struct *info )
/* get the status of the received byte */
status = usc_InReg(info, RCSR);
- if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
- RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) )
+ if ( status & (RXSTATUS_FRAMING_ERROR | RXSTATUS_PARITY_ERROR |
+ RXSTATUS_OVERRUN | RXSTATUS_BREAK_RECEIVED) )
usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
icount->rx++;
flag = 0;
- if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
- RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) ) {
- printk("rxerr=%04X\n",status);
+ if ( status & (RXSTATUS_FRAMING_ERROR | RXSTATUS_PARITY_ERROR |
+ RXSTATUS_OVERRUN | RXSTATUS_BREAK_RECEIVED) ) {
+ printk("rxerr=%04X\n",status);
/* update error statistics */
if ( status & RXSTATUS_BREAK_RECEIVED ) {
- status &= ~(RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR);
+ status &= ~(RXSTATUS_FRAMING_ERROR | RXSTATUS_PARITY_ERROR);
icount->brk++;
- } else if (status & RXSTATUS_PARITY_ERROR)
+ } else if (status & RXSTATUS_PARITY_ERROR)
icount->parity++;
else if (status & RXSTATUS_FRAMING_ERROR)
icount->frame++;
@@ -1488,7 +1488,7 @@ static void mgsl_isr_receive_data( struct mgsl_struct *info )
icount->overrun++;
}
- /* discard char if tty control flags say so */
+ /* discard char if tty control flags say so */
if (status & info->ignore_status_mask)
continue;
@@ -1545,8 +1545,8 @@ static void mgsl_isr_misc( struct mgsl_struct *info )
usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
usc_DmaCmd(info, DmaCmd_ResetRxChannel);
usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
- usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
- usc_DisableInterrupts(info, RECEIVE_DATA + RECEIVE_STATUS);
+ usc_ClearIrqPendingBits(info, RECEIVE_DATA | RECEIVE_STATUS);
+ usc_DisableInterrupts(info, RECEIVE_DATA | RECEIVE_STATUS);
/* schedule BH handler to restart receiver */
info->pending_bh |= BH_RECEIVE;
@@ -1595,7 +1595,7 @@ static void mgsl_isr_receive_dma( struct mgsl_struct *info )
u16 status;
/* clear interrupt pending and IUS bit for Rx DMA IRQ */
- usc_OutDmaReg( info, CDIR, BIT9+BIT1 );
+ usc_OutDmaReg( info, CDIR, BIT9 | BIT1 );
/* Read the receive DMA status to identify interrupt type. */
/* This also clears the status bits. */
@@ -1639,7 +1639,7 @@ static void mgsl_isr_transmit_dma( struct mgsl_struct *info )
u16 status;
/* clear interrupt pending and IUS bit for Tx DMA IRQ */
- usc_OutDmaReg(info, CDIR, BIT8+BIT0 );
+ usc_OutDmaReg(info, CDIR, BIT8 | BIT0 );
/* Read the transmit DMA status to identify interrupt type. */
/* This also clears the status bits. */
@@ -1832,8 +1832,8 @@ static void shutdown(struct mgsl_struct * info)
usc_DisableMasterIrqBit(info);
usc_stop_receiver(info);
usc_stop_transmitter(info);
- usc_DisableInterrupts(info,RECEIVE_DATA + RECEIVE_STATUS +
- TRANSMIT_DATA + TRANSMIT_STATUS + IO_PIN + MISC );
+ usc_DisableInterrupts(info,RECEIVE_DATA | RECEIVE_STATUS |
+ TRANSMIT_DATA | TRANSMIT_STATUS | IO_PIN | MISC );
usc_DisableDmaInterrupts(info,DICR_MASTER + DICR_TRANSMIT + DICR_RECEIVE);
/* Disable DMAEN (Port 7, Bit 14) */
@@ -1886,7 +1886,7 @@ static void mgsl_program_hw(struct mgsl_struct *info)
info->ri_chkcount = 0;
info->dsr_chkcount = 0;
- usc_EnableStatusIrqs(info,SICR_CTS+SICR_DSR+SICR_DCD+SICR_RI);
+ usc_EnableStatusIrqs(info,SICR_CTS+SICR_DSR+SICR_DCD+SICR_RI);
usc_EnableInterrupts(info, IO_PIN);
usc_get_serial_signals(info);
@@ -2773,7 +2773,7 @@ static int mgsl_wait_event(struct mgsl_struct * info, int __user * mask_ptr)
if (!waitqueue_active(&info->event_wait_q)) {
/* disable enable exit hunt mode/idle rcvd IRQs */
usc_OutReg(info, RICR, usc_InReg(info,RICR) &
- ~(RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED));
+ ~(RXSTATUS_EXITED_HUNT | RXSTATUS_IDLE_RECEIVED));
}
spin_unlock_irqrestore(&info->irq_spinlock,flags);
}
@@ -3092,7 +3092,7 @@ static void mgsl_close(struct tty_struct *tty, struct file * filp)
printk("%s(%d):mgsl_close(%s) entry, count=%d\n",
__FILE__,__LINE__, info->device_name, info->port.count);
- if (tty_port_close_start(&info->port, tty, filp) == 0)
+ if (tty_port_close_start(&info->port, tty, filp) == 0)
goto cleanup;
mutex_lock(&info->port.mutex);
@@ -4297,7 +4297,7 @@ static struct mgsl_struct* mgsl_allocate_device(void)
spin_lock_init(&info->irq_spinlock);
spin_lock_init(&info->netlock);
memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
- info->idle_mode = HDLC_TXIDLE_FLAGS;
+ info->idle_mode = HDLC_TXIDLE_FLAGS;
info->num_tx_dma_buffers = 1;
info->num_tx_holding_buffers = 0;
}
@@ -4722,7 +4722,7 @@ static void usc_set_sdlc_mode( struct mgsl_struct *info )
else if ( info->params.flags & HDLC_FLAG_UNDERRUN_FLAG )
RegValue |= BIT15;
else if ( info->params.flags & HDLC_FLAG_UNDERRUN_CRC )
- RegValue |= BIT15 + BIT14;
+ RegValue |= BIT15 | BIT14;
}
if ( info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE )
@@ -4763,11 +4763,11 @@ static void usc_set_sdlc_mode( struct mgsl_struct *info )
switch ( info->params.encoding ) {
case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
- case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
+ case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 | BIT13; break;
case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
- case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
- case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
- case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
+ case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 | BIT13; break;
+ case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 | BIT14; break;
+ case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 | BIT14 | BIT13; break;
}
if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
@@ -4838,15 +4838,15 @@ static void usc_set_sdlc_mode( struct mgsl_struct *info )
switch ( info->params.encoding ) {
case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
- case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
+ case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 | BIT13; break;
case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
- case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
- case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
- case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
+ case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 | BIT13; break;
+ case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 | BIT14; break;
+ case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 | BIT14 | BIT13; break;
}
if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
- RegValue |= BIT9 + BIT8;
+ RegValue |= BIT9 | BIT8;
else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
RegValue |= ( BIT12 | BIT10 | BIT9 | BIT8);
@@ -4957,7 +4957,7 @@ static void usc_set_sdlc_mode( struct mgsl_struct *info )
RegValue = 0x0000;
- if ( info->params.flags & (HDLC_FLAG_RXC_DPLL + HDLC_FLAG_TXC_DPLL) ) {
+ if ( info->params.flags & (HDLC_FLAG_RXC_DPLL | HDLC_FLAG_TXC_DPLL) ) {
u32 XtalSpeed;
u32 DpllDivisor;
u16 Tc;
@@ -5019,7 +5019,7 @@ static void usc_set_sdlc_mode( struct mgsl_struct *info )
case HDLC_ENCODING_BIPHASE_MARK:
case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT9; break;
case HDLC_ENCODING_BIPHASE_LEVEL:
- case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT9 + BIT8; break;
+ case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT9 | BIT8; break;
}
}
@@ -5056,8 +5056,8 @@ static void usc_set_sdlc_mode( struct mgsl_struct *info )
/* enable Master Interrupt Enable bit (MIE) */
usc_EnableMasterIrqBit( info );
- usc_ClearIrqPendingBits( info, RECEIVE_STATUS + RECEIVE_DATA +
- TRANSMIT_STATUS + TRANSMIT_DATA + MISC);
+ usc_ClearIrqPendingBits( info, RECEIVE_STATUS | RECEIVE_DATA |
+ TRANSMIT_STATUS | TRANSMIT_DATA | MISC);
/* arm RCC underflow interrupt */
usc_OutReg(info, SICR, (u16)(usc_InReg(info,SICR) | BIT3));
@@ -5175,14 +5175,14 @@ static void usc_set_sdlc_mode( struct mgsl_struct *info )
switch ( info->params.preamble_length ) {
case HDLC_PREAMBLE_LENGTH_16BITS: RegValue |= BIT10; break;
case HDLC_PREAMBLE_LENGTH_32BITS: RegValue |= BIT11; break;
- case HDLC_PREAMBLE_LENGTH_64BITS: RegValue |= BIT11 + BIT10; break;
+ case HDLC_PREAMBLE_LENGTH_64BITS: RegValue |= BIT11 | BIT10; break;
}
switch ( info->params.preamble ) {
- case HDLC_PREAMBLE_PATTERN_FLAGS: RegValue |= BIT8 + BIT12; break;
+ case HDLC_PREAMBLE_PATTERN_FLAGS: RegValue |= BIT8 | BIT12; break;
case HDLC_PREAMBLE_PATTERN_ONES: RegValue |= BIT8; break;
case HDLC_PREAMBLE_PATTERN_10: RegValue |= BIT9; break;
- case HDLC_PREAMBLE_PATTERN_01: RegValue |= BIT9 + BIT8; break;
+ case HDLC_PREAMBLE_PATTERN_01: RegValue |= BIT9 | BIT8; break;
}
usc_OutReg( info, CCR, RegValue );
@@ -5221,7 +5221,7 @@ static void usc_enable_loopback(struct mgsl_struct *info, int enable)
{
if (enable) {
/* blank external TXD output */
- usc_OutReg(info,IOCR,usc_InReg(info,IOCR) | (BIT7+BIT6));
+ usc_OutReg(info,IOCR,usc_InReg(info,IOCR) | (BIT7 | BIT6));
/* Clock mode Control Register (CMCR)
*
@@ -5260,7 +5260,7 @@ static void usc_enable_loopback(struct mgsl_struct *info, int enable)
outw( 0x0300, info->io_base + CCAR );
} else {
/* enable external TXD output */
- usc_OutReg(info,IOCR,usc_InReg(info,IOCR) & ~(BIT7+BIT6));
+ usc_OutReg(info,IOCR,usc_InReg(info,IOCR) & ~(BIT7 | BIT6));
/* clear Internal Data loopback mode */
info->loopback_bits = 0;
@@ -5447,13 +5447,13 @@ static void usc_process_rxoverrun_sync( struct mgsl_struct *info )
usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
- usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
+ usc_ClearIrqPendingBits( info, RECEIVE_DATA | RECEIVE_STATUS );
usc_EnableInterrupts( info, RECEIVE_STATUS );
/* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
/* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
- usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
+ usc_OutDmaReg( info, RDIAR, BIT3 | BIT2 );
usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
usc_DmaCmd( info, DmaCmd_InitRxChannel );
if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
@@ -5488,8 +5488,8 @@ static void usc_stop_receiver( struct mgsl_struct *info )
usc_DmaCmd( info, DmaCmd_ResetRxChannel );
usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
- usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
- usc_DisableInterrupts( info, RECEIVE_DATA + RECEIVE_STATUS );
+ usc_ClearIrqPendingBits( info, RECEIVE_DATA | RECEIVE_STATUS );
+ usc_DisableInterrupts( info, RECEIVE_DATA | RECEIVE_STATUS );
usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
@@ -5536,13 +5536,13 @@ static void usc_start_receiver( struct mgsl_struct *info )
usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
- usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
+ usc_ClearIrqPendingBits( info, RECEIVE_DATA | RECEIVE_STATUS );
usc_EnableInterrupts( info, RECEIVE_STATUS );
/* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
/* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
- usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
+ usc_OutDmaReg( info, RDIAR, BIT3 | BIT2 );
usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
usc_DmaCmd( info, DmaCmd_InitRxChannel );
if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
@@ -5551,7 +5551,7 @@ static void usc_start_receiver( struct mgsl_struct *info )
usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
} else {
usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
- usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
+ usc_ClearIrqPendingBits(info, RECEIVE_DATA | RECEIVE_STATUS);
usc_EnableInterrupts(info, RECEIVE_DATA);
usc_RTCmd( info, RTCmd_PurgeRxFifo );
@@ -5925,7 +5925,7 @@ static void usc_set_async_mode( struct mgsl_struct *info )
RegValue = 0;
if ( info->params.data_bits != 8 )
- RegValue |= BIT4+BIT3+BIT2;
+ RegValue |= BIT4 | BIT3 | BIT2;
if ( info->params.parity != ASYNC_PARITY_NONE ) {
RegValue |= BIT5;
@@ -5982,7 +5982,7 @@ static void usc_set_async_mode( struct mgsl_struct *info )
RegValue = 0;
if ( info->params.data_bits != 8 )
- RegValue |= BIT4+BIT3+BIT2;
+ RegValue |= BIT4 | BIT3 | BIT2;
if ( info->params.parity != ASYNC_PARITY_NONE ) {
RegValue |= BIT5;
@@ -6129,7 +6129,7 @@ static void usc_loopback_frame( struct mgsl_struct *info )
/* WAIT FOR RECEIVE COMPLETE */
for (i=0 ; i<1000 ; i++)
- if (usc_InReg( info, RCSR ) & (BIT8 + BIT4 + BIT3 + BIT1))
+ if (usc_InReg( info, RCSR ) & (BIT8 | BIT4 | BIT3 | BIT1))
break;
/* clear Internal Data loopback mode */
@@ -6579,8 +6579,8 @@ static bool mgsl_get_rx_frame(struct mgsl_struct *info)
status = info->rx_buffer_list[EndIndex].status;
- if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
- RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
+ if ( status & (RXSTATUS_SHORT_FRAME | RXSTATUS_OVERRUN |
+ RXSTATUS_CRC_ERROR | RXSTATUS_ABORT) ) {
if ( status & RXSTATUS_SHORT_FRAME )
info->icount.rxshort++;
else if ( status & RXSTATUS_ABORT )
@@ -6762,8 +6762,8 @@ static bool mgsl_get_raw_rx_frame(struct mgsl_struct *info)
status = info->rx_buffer_list[CurrentIndex].status;
- if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
- RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
+ if ( status & (RXSTATUS_SHORT_FRAME | RXSTATUS_OVERRUN |
+ RXSTATUS_CRC_ERROR | RXSTATUS_ABORT) ) {
if ( status & RXSTATUS_SHORT_FRAME )
info->icount.rxshort++;
else if ( status & RXSTATUS_ABORT )
@@ -6899,7 +6899,7 @@ static void mgsl_load_tx_dma_buffer(struct mgsl_struct *info,
/* set CMR:13 to start transmit when
* next GoAhead (abort) is received
*/
- info->cmr_value |= BIT13;
+ info->cmr_value |= BIT13;
}
/* begin loading the frame in the next available tx dma
@@ -7278,7 +7278,7 @@ static bool mgsl_dma_test( struct mgsl_struct *info )
spin_unlock_irqrestore(&info->irq_spinlock,flags);
-
+
/******************************/
/* WAIT FOR TRANSMIT COMPLETE */
/******************************/
@@ -7292,7 +7292,7 @@ static bool mgsl_dma_test( struct mgsl_struct *info )
status = usc_InReg( info, TCSR );
spin_unlock_irqrestore(&info->irq_spinlock,flags);
- while ( !(status & (BIT6+BIT5+BIT4+BIT2+BIT1)) ) {
+ while ( !(status & (BIT6 | BIT5 | BIT4 | BIT2 | BIT1)) ) {
if (time_after(jiffies, EndTime)) {
rc = false;
break;
@@ -7307,7 +7307,7 @@ static bool mgsl_dma_test( struct mgsl_struct *info )
if ( rc ){
/* CHECK FOR TRANSMIT ERRORS */
- if ( status & (BIT5 + BIT1) )
+ if ( status & (BIT5 | BIT1) )
rc = false;
}
@@ -7333,7 +7333,7 @@ static bool mgsl_dma_test( struct mgsl_struct *info )
/* CHECK FOR RECEIVE ERRORS */
status = info->rx_buffer_list[0].status;
- if ( status & (BIT8 + BIT3 + BIT1) ) {
+ if ( status & (BIT8 | BIT3 | BIT1) ) {
/* receive error has occurred */
rc = false;
} else {
@@ -7605,7 +7605,7 @@ static void usc_loopmode_send_done( struct mgsl_struct * info )
{
info->loopmode_send_done_requested = false;
/* clear CMR:13 to 0 to start echoing RxData to TxData */
- info->cmr_value &= ~BIT13;
+ info->cmr_value &= ~BIT13;
usc_OutReg(info, CMR, info->cmr_value);
}
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index 9121c1f..c043136f 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -18,31 +18,118 @@
#include <linux/module.h>
#include <linux/ratelimit.h>
+
+#define MIN_TTYB_SIZE 256
+#define TTYB_ALIGN_MASK 255
+
+/*
+ * Byte threshold to limit memory consumption for flip buffers.
+ * The actual memory limit is > 2x this amount.
+ */
+#define TTYB_MEM_LIMIT 65536
+
+/*
+ * We default to dicing tty buffer allocations to this many characters
+ * in order to avoid multiple page allocations. We know the size of
+ * tty_buffer itself but it must also be taken into account that the
+ * the buffer is 256 byte aligned. See tty_buffer_find for the allocation
+ * logic this must match
+ */
+
+#define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF)
+
+
+/**
+ * tty_buffer_lock_exclusive - gain exclusive access to buffer
+ * tty_buffer_unlock_exclusive - release exclusive access
+ *
+ * @port - tty_port owning the flip buffer
+ *
+ * Guarantees safe use of the line discipline's receive_buf() method by
+ * excluding the buffer work and any pending flush from using the flip
+ * buffer. Data can continue to be added concurrently to the flip buffer
+ * from the driver side.
+ *
+ * On release, the buffer work is restarted if there is data in the
+ * flip buffer
+ */
+
+void tty_buffer_lock_exclusive(struct tty_port *port)
+{
+ struct tty_bufhead *buf = &port->buf;
+
+ atomic_inc(&buf->priority);
+ mutex_lock(&buf->lock);
+}
+
+void tty_buffer_unlock_exclusive(struct tty_port *port)
+{
+ struct tty_bufhead *buf = &port->buf;
+ int restart;
+
+ restart = buf->head->commit != buf->head->read;
+
+ atomic_dec(&buf->priority);
+ mutex_unlock(&buf->lock);
+ if (restart)
+ queue_work(system_unbound_wq, &buf->work);
+}
+
+/**
+ * tty_buffer_space_avail - return unused buffer space
+ * @port - tty_port owning the flip buffer
+ *
+ * Returns the # of bytes which can be written by the driver without
+ * reaching the buffer limit.
+ *
+ * Note: this does not guarantee that memory is available to write
+ * the returned # of bytes (use tty_prepare_flip_string_xxx() to
+ * pre-allocate if memory guarantee is required).
+ */
+
+int tty_buffer_space_avail(struct tty_port *port)
+{
+ int space = TTYB_MEM_LIMIT - atomic_read(&port->buf.memory_used);
+ return max(space, 0);
+}
+
+static void tty_buffer_reset(struct tty_buffer *p, size_t size)
+{
+ p->used = 0;
+ p->size = size;
+ p->next = NULL;
+ p->commit = 0;
+ p->read = 0;
+}
+
/**
* tty_buffer_free_all - free buffers used by a tty
* @tty: tty to free from
*
* Remove all the buffers pending on a tty whether queued with data
* or in the free ring. Must be called when the tty is no longer in use
- *
- * Locking: none
*/
void tty_buffer_free_all(struct tty_port *port)
{
struct tty_bufhead *buf = &port->buf;
- struct tty_buffer *thead;
+ struct tty_buffer *p, *next;
+ struct llist_node *llist;
- while ((thead = buf->head) != NULL) {
- buf->head = thead->next;
- kfree(thead);
- }
- while ((thead = buf->free) != NULL) {
- buf->free = thead->next;
- kfree(thead);
+ while ((p = buf->head) != NULL) {
+ buf->head = p->next;
+ if (p->size > 0)
+ kfree(p);
}
- buf->tail = NULL;
- buf->memory_used = 0;
+ llist = llist_del_all(&buf->free);
+ llist_for_each_entry_safe(p, next, llist, free)
+ kfree(p);
+
+ tty_buffer_reset(&buf->sentinel, 0);
+ buf->head = &buf->sentinel;
+ buf->tail = &buf->sentinel;
+
+ atomic_set(&buf->memory_used, 0);
}
/**
@@ -51,29 +138,39 @@ void tty_buffer_free_all(struct tty_port *port)
* @size: desired size (characters)
*
* Allocate a new tty buffer to hold the desired number of characters.
+ * We round our buffers off in 256 character chunks to get better
+ * allocation behaviour.
* Return NULL if out of memory or the allocation would exceed the
* per device queue
- *
- * Locking: Caller must hold tty->buf.lock
*/
static struct tty_buffer *tty_buffer_alloc(struct tty_port *port, size_t size)
{
+ struct llist_node *free;
struct tty_buffer *p;
- if (port->buf.memory_used + size > 65536)
+ /* Round the buffer size out */
+ size = __ALIGN_MASK(size, TTYB_ALIGN_MASK);
+
+ if (size <= MIN_TTYB_SIZE) {
+ free = llist_del_first(&port->buf.free);
+ if (free) {
+ p = llist_entry(free, struct tty_buffer, free);
+ goto found;
+ }
+ }
+
+ /* Should possibly check if this fails for the largest buffer we
+ have queued and recycle that ? */
+ if (atomic_read(&port->buf.memory_used) > TTYB_MEM_LIMIT)
return NULL;
p = kmalloc(sizeof(struct tty_buffer) + 2 * size, GFP_ATOMIC);
if (p == NULL)
return NULL;
- p->used = 0;
- p->size = size;
- p->next = NULL;
- p->commit = 0;
- p->read = 0;
- p->char_buf_ptr = (char *)(p->data);
- p->flag_buf_ptr = (unsigned char *)p->char_buf_ptr + size;
- port->buf.memory_used += size;
+
+found:
+ tty_buffer_reset(p, size);
+ atomic_add(size, &port->buf.memory_used);
return p;
}
@@ -84,8 +181,6 @@ static struct tty_buffer *tty_buffer_alloc(struct tty_port *port, size_t size)
*
* Free a tty buffer, or add it to the free list according to our
* internal strategy
- *
- * Locking: Caller must hold tty->buf.lock
*/
static void tty_buffer_free(struct tty_port *port, struct tty_buffer *b)
@@ -93,41 +188,12 @@ static void tty_buffer_free(struct tty_port *port, struct tty_buffer *b)
struct tty_bufhead *buf = &port->buf;
/* Dumb strategy for now - should keep some stats */
- buf->memory_used -= b->size;
- WARN_ON(buf->memory_used < 0);
+ WARN_ON(atomic_sub_return(b->size, &buf->memory_used) < 0);
- if (b->size >= 512)
+ if (b->size > MIN_TTYB_SIZE)
kfree(b);
- else {
- b->next = buf->free;
- buf->free = b;
- }
-}
-
-/**
- * __tty_buffer_flush - flush full tty buffers
- * @tty: tty to flush
- *
- * flush all the buffers containing receive data. Caller must
- * hold the buffer lock and must have ensured no parallel flush to
- * ldisc is running.
- *
- * Locking: Caller must hold tty->buf.lock
- */
-
-static void __tty_buffer_flush(struct tty_port *port)
-{
- struct tty_bufhead *buf = &port->buf;
- struct tty_buffer *thead;
-
- if (unlikely(buf->head == NULL))
- return;
- while ((thead = buf->head->next) != NULL) {
- tty_buffer_free(port, buf->head);
- buf->head = thead;
- }
- WARN_ON(buf->head != buf->tail);
- buf->head->read = buf->head->commit;
+ else if (b->size > 0)
+ llist_add(&b->free, &buf->free);
}
/**
@@ -138,65 +204,28 @@ static void __tty_buffer_flush(struct tty_port *port)
* being processed by flush_to_ldisc then we defer the processing
* to that function
*
- * Locking: none
+ * Locking: takes buffer lock to ensure single-threaded flip buffer
+ * 'consumer'
*/
void tty_buffer_flush(struct tty_struct *tty)
{
struct tty_port *port = tty->port;
struct tty_bufhead *buf = &port->buf;
- unsigned long flags;
-
- spin_lock_irqsave(&buf->lock, flags);
-
- /* If the data is being pushed to the tty layer then we can't
- process it here. Instead set a flag and the flush_to_ldisc
- path will process the flush request before it exits */
- if (test_bit(TTYP_FLUSHING, &port->iflags)) {
- set_bit(TTYP_FLUSHPENDING, &port->iflags);
- spin_unlock_irqrestore(&buf->lock, flags);
- wait_event(tty->read_wait,
- test_bit(TTYP_FLUSHPENDING, &port->iflags) == 0);
- return;
- } else
- __tty_buffer_flush(port);
- spin_unlock_irqrestore(&buf->lock, flags);
-}
+ struct tty_buffer *next;
-/**
- * tty_buffer_find - find a free tty buffer
- * @tty: tty owning the buffer
- * @size: characters wanted
- *
- * Locate an existing suitable tty buffer or if we are lacking one then
- * allocate a new one. We round our buffers off in 256 character chunks
- * to get better allocation behaviour.
- *
- * Locking: Caller must hold tty->buf.lock
- */
+ atomic_inc(&buf->priority);
-static struct tty_buffer *tty_buffer_find(struct tty_port *port, size_t size)
-{
- struct tty_buffer **tbh = &port->buf.free;
- while ((*tbh) != NULL) {
- struct tty_buffer *t = *tbh;
- if (t->size >= size) {
- *tbh = t->next;
- t->next = NULL;
- t->used = 0;
- t->commit = 0;
- t->read = 0;
- port->buf.memory_used += t->size;
- return t;
- }
- tbh = &((*tbh)->next);
+ mutex_lock(&buf->lock);
+ while ((next = buf->head->next) != NULL) {
+ tty_buffer_free(port, buf->head);
+ buf->head = next;
}
- /* Round the buffer size out */
- size = (size + 0xFF) & ~0xFF;
- return tty_buffer_alloc(port, size);
- /* Should possibly check if this fails for the largest buffer we
- have queued and recycle that ? */
+ buf->head->read = buf->head->commit;
+ atomic_dec(&buf->priority);
+ mutex_unlock(&buf->lock);
}
+
/**
* tty_buffer_request_room - grow tty buffer if needed
* @tty: tty structure
@@ -204,38 +233,26 @@ static struct tty_buffer *tty_buffer_find(struct tty_port *port, size_t size)
*
* Make at least size bytes of linear space available for the tty
* buffer. If we fail return the size we managed to find.
- *
- * Locking: Takes port->buf.lock
*/
int tty_buffer_request_room(struct tty_port *port, size_t size)
{
struct tty_bufhead *buf = &port->buf;
struct tty_buffer *b, *n;
int left;
- unsigned long flags;
- spin_lock_irqsave(&buf->lock, flags);
- /* OPTIMISATION: We could keep a per tty "zero" sized buffer to
- remove this conditional if its worth it. This would be invisible
- to the callers */
+
b = buf->tail;
- if (b != NULL)
- left = b->size - b->used;
- else
- left = 0;
+ left = b->size - b->used;
if (left < size) {
/* This is the slow path - looking for new buffers to use */
- if ((n = tty_buffer_find(port, size)) != NULL) {
- if (b != NULL) {
- b->next = n;
- b->commit = b->used;
- } else
- buf->head = n;
+ if ((n = tty_buffer_alloc(port, size)) != NULL) {
buf->tail = n;
+ b->commit = b->used;
+ smp_mb();
+ b->next = n;
} else
size = left;
}
- spin_unlock_irqrestore(&buf->lock, flags);
return size;
}
EXPORT_SYMBOL_GPL(tty_buffer_request_room);
@@ -249,8 +266,6 @@ EXPORT_SYMBOL_GPL(tty_buffer_request_room);
*
* Queue a series of bytes to the tty buffering. All the characters
* passed are marked with the supplied flag. Returns the number added.
- *
- * Locking: Called functions may take port->buf.lock
*/
int tty_insert_flip_string_fixed_flag(struct tty_port *port,
@@ -261,12 +276,10 @@ int tty_insert_flip_string_fixed_flag(struct tty_port *port,
int goal = min_t(size_t, size - copied, TTY_BUFFER_PAGE);
int space = tty_buffer_request_room(port, goal);
struct tty_buffer *tb = port->buf.tail;
- /* If there is no space then tb may be NULL */
- if (unlikely(space == 0)) {
+ if (unlikely(space == 0))
break;
- }
- memcpy(tb->char_buf_ptr + tb->used, chars, space);
- memset(tb->flag_buf_ptr + tb->used, flag, space);
+ memcpy(char_buf_ptr(tb, tb->used), chars, space);
+ memset(flag_buf_ptr(tb, tb->used), flag, space);
tb->used += space;
copied += space;
chars += space;
@@ -287,8 +300,6 @@ EXPORT_SYMBOL(tty_insert_flip_string_fixed_flag);
* Queue a series of bytes to the tty buffering. For each character
* the flags array indicates the status of the character. Returns the
* number added.
- *
- * Locking: Called functions may take port->buf.lock
*/
int tty_insert_flip_string_flags(struct tty_port *port,
@@ -299,12 +310,10 @@ int tty_insert_flip_string_flags(struct tty_port *port,
int goal = min_t(size_t, size - copied, TTY_BUFFER_PAGE);
int space = tty_buffer_request_room(port, goal);
struct tty_buffer *tb = port->buf.tail;
- /* If there is no space then tb may be NULL */
- if (unlikely(space == 0)) {
+ if (unlikely(space == 0))
break;
- }
- memcpy(tb->char_buf_ptr + tb->used, chars, space);
- memcpy(tb->flag_buf_ptr + tb->used, flags, space);
+ memcpy(char_buf_ptr(tb, tb->used), chars, space);
+ memcpy(flag_buf_ptr(tb, tb->used), flags, space);
tb->used += space;
copied += space;
chars += space;
@@ -325,20 +334,14 @@ EXPORT_SYMBOL(tty_insert_flip_string_flags);
* processing by the line discipline.
* Note that this function can only be used when the low_latency flag
* is unset. Otherwise the workqueue won't be flushed.
- *
- * Locking: Takes port->buf.lock
*/
void tty_schedule_flip(struct tty_port *port)
{
struct tty_bufhead *buf = &port->buf;
- unsigned long flags;
WARN_ON(port->low_latency);
- spin_lock_irqsave(&buf->lock, flags);
- if (buf->tail != NULL)
- buf->tail->commit = buf->tail->used;
- spin_unlock_irqrestore(&buf->lock, flags);
+ buf->tail->commit = buf->tail->used;
schedule_work(&buf->work);
}
EXPORT_SYMBOL(tty_schedule_flip);
@@ -354,8 +357,6 @@ EXPORT_SYMBOL(tty_schedule_flip);
* accounted for as ready for normal characters. This is used for drivers
* that need their own block copy routines into the buffer. There is no
* guarantee the buffer is a DMA target!
- *
- * Locking: May call functions taking port->buf.lock
*/
int tty_prepare_flip_string(struct tty_port *port, unsigned char **chars,
@@ -364,8 +365,8 @@ int tty_prepare_flip_string(struct tty_port *port, unsigned char **chars,
int space = tty_buffer_request_room(port, size);
if (likely(space)) {
struct tty_buffer *tb = port->buf.tail;
- *chars = tb->char_buf_ptr + tb->used;
- memset(tb->flag_buf_ptr + tb->used, TTY_NORMAL, space);
+ *chars = char_buf_ptr(tb, tb->used);
+ memset(flag_buf_ptr(tb, tb->used), TTY_NORMAL, space);
tb->used += space;
}
return space;
@@ -384,8 +385,6 @@ EXPORT_SYMBOL_GPL(tty_prepare_flip_string);
* accounted for as ready for characters. This is used for drivers
* that need their own block copy routines into the buffer. There is no
* guarantee the buffer is a DMA target!
- *
- * Locking: May call functions taking port->buf.lock
*/
int tty_prepare_flip_string_flags(struct tty_port *port,
@@ -394,8 +393,8 @@ int tty_prepare_flip_string_flags(struct tty_port *port,
int space = tty_buffer_request_room(port, size);
if (likely(space)) {
struct tty_buffer *tb = port->buf.tail;
- *chars = tb->char_buf_ptr + tb->used;
- *flags = tb->flag_buf_ptr + tb->used;
+ *chars = char_buf_ptr(tb, tb->used);
+ *flags = flag_buf_ptr(tb, tb->used);
tb->used += space;
}
return space;
@@ -403,6 +402,23 @@ int tty_prepare_flip_string_flags(struct tty_port *port,
EXPORT_SYMBOL_GPL(tty_prepare_flip_string_flags);
+static int
+receive_buf(struct tty_struct *tty, struct tty_buffer *head, int count)
+{
+ struct tty_ldisc *disc = tty->ldisc;
+ unsigned char *p = char_buf_ptr(head, head->read);
+ char *f = flag_buf_ptr(head, head->read);
+
+ if (disc->ops->receive_buf2)
+ count = disc->ops->receive_buf2(tty, p, f, count);
+ else {
+ count = min_t(int, count, tty->receive_room);
+ if (count)
+ disc->ops->receive_buf(tty, p, f, count);
+ }
+ head->read += count;
+ return count;
+}
/**
* flush_to_ldisc
@@ -411,9 +427,10 @@ EXPORT_SYMBOL_GPL(tty_prepare_flip_string_flags);
* This routine is called out of the software interrupt to flush data
* from the buffer chain to the line discipline.
*
- * Locking: holds tty->buf.lock to guard buffer list. Drops the lock
- * while invoking the line discipline receive_buf method. The
- * receive_buf method is single threaded for each tty instance.
+ * The receive_buf method is single threaded for each tty instance.
+ *
+ * Locking: takes buffer lock to ensure single-threaded flip buffer
+ * 'consumer'
*/
static void flush_to_ldisc(struct work_struct *work)
@@ -421,7 +438,6 @@ static void flush_to_ldisc(struct work_struct *work)
struct tty_port *port = container_of(work, struct tty_port, buf.work);
struct tty_bufhead *buf = &port->buf;
struct tty_struct *tty;
- unsigned long flags;
struct tty_ldisc *disc;
tty = port->itty;
@@ -429,52 +445,34 @@ static void flush_to_ldisc(struct work_struct *work)
return;
disc = tty_ldisc_ref(tty);
- if (disc == NULL) /* !TTY_LDISC */
+ if (disc == NULL)
return;
- spin_lock_irqsave(&buf->lock, flags);
-
- if (!test_and_set_bit(TTYP_FLUSHING, &port->iflags)) {
- struct tty_buffer *head;
- while ((head = buf->head) != NULL) {
- int count;
- char *char_buf;
- unsigned char *flag_buf;
-
- count = head->commit - head->read;
- if (!count) {
- if (head->next == NULL)
- break;
- buf->head = head->next;
- tty_buffer_free(port, head);
- continue;
- }
- if (!tty->receive_room)
- break;
- if (count > tty->receive_room)
- count = tty->receive_room;
- char_buf = head->char_buf_ptr + head->read;
- flag_buf = head->flag_buf_ptr + head->read;
- head->read += count;
- spin_unlock_irqrestore(&buf->lock, flags);
- disc->ops->receive_buf(tty, char_buf,
- flag_buf, count);
- spin_lock_irqsave(&buf->lock, flags);
- /* Ldisc or user is trying to flush the buffers.
- We may have a deferred request to flush the
- input buffer, if so pull the chain under the lock
- and empty the queue */
- if (test_bit(TTYP_FLUSHPENDING, &port->iflags)) {
- __tty_buffer_flush(port);
- clear_bit(TTYP_FLUSHPENDING, &port->iflags);
- wake_up(&tty->read_wait);
+ mutex_lock(&buf->lock);
+
+ while (1) {
+ struct tty_buffer *head = buf->head;
+ int count;
+
+ /* Ldisc or user is trying to gain exclusive access */
+ if (atomic_read(&buf->priority))
+ break;
+
+ count = head->commit - head->read;
+ if (!count) {
+ if (head->next == NULL)
break;
- }
+ buf->head = head->next;
+ tty_buffer_free(port, head);
+ continue;
}
- clear_bit(TTYP_FLUSHING, &port->iflags);
+
+ count = receive_buf(tty, head, count);
+ if (!count)
+ break;
}
- spin_unlock_irqrestore(&buf->lock, flags);
+ mutex_unlock(&buf->lock);
tty_ldisc_deref(disc);
}
@@ -503,19 +501,13 @@ void tty_flush_to_ldisc(struct tty_struct *tty)
*
* In the event of the queue being busy for flipping the work will be
* held off and retried later.
- *
- * Locking: tty buffer lock. Driver locks in low latency mode.
*/
void tty_flip_buffer_push(struct tty_port *port)
{
struct tty_bufhead *buf = &port->buf;
- unsigned long flags;
- spin_lock_irqsave(&buf->lock, flags);
- if (buf->tail != NULL)
- buf->tail->commit = buf->tail->used;
- spin_unlock_irqrestore(&buf->lock, flags);
+ buf->tail->commit = buf->tail->used;
if (port->low_latency)
flush_to_ldisc(&buf->work);
@@ -530,19 +522,18 @@ EXPORT_SYMBOL(tty_flip_buffer_push);
*
* Set up the initial state of the buffer management for a tty device.
* Must be called before the other tty buffer functions are used.
- *
- * Locking: none
*/
void tty_buffer_init(struct tty_port *port)
{
struct tty_bufhead *buf = &port->buf;
- spin_lock_init(&buf->lock);
- buf->head = NULL;
- buf->tail = NULL;
- buf->free = NULL;
- buf->memory_used = 0;
+ mutex_init(&buf->lock);
+ tty_buffer_reset(&buf->sentinel, 0);
+ buf->head = &buf->sentinel;
+ buf->tail = &buf->sentinel;
+ init_llist_head(&buf->free);
+ atomic_set(&buf->memory_used, 0);
+ atomic_set(&buf->priority, 0);
INIT_WORK(&buf->work, flush_to_ldisc);
}
-
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 366af83..a9355ce 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -603,8 +603,8 @@ static int tty_signal_session_leader(struct tty_struct *tty, int exit_session)
* BTM
* redirect lock for undoing redirection
* file list lock for manipulating list of ttys
- * tty_ldisc_lock from called functions
- * termios_mutex resetting termios data
+ * tty_ldiscs_lock from called functions
+ * termios_rwsem resetting termios data
* tasklist_lock to walk task list for hangup event
* ->siglock to protect ->signal/->sighand
*/
@@ -629,6 +629,11 @@ static void __tty_hangup(struct tty_struct *tty, int exit_session)
tty_lock(tty);
+ if (test_bit(TTY_HUPPED, &tty->flags)) {
+ tty_unlock(tty);
+ return;
+ }
+
/* some functions below drop BTM, so we need this bit */
set_bit(TTY_HUPPING, &tty->flags);
@@ -664,7 +669,6 @@ static void __tty_hangup(struct tty_struct *tty, int exit_session)
spin_lock_irq(&tty->ctrl_lock);
clear_bit(TTY_THROTTLED, &tty->flags);
- clear_bit(TTY_PUSH, &tty->flags);
clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
put_pid(tty->session);
put_pid(tty->pgrp);
@@ -1388,8 +1392,7 @@ static int tty_reopen(struct tty_struct *tty)
struct tty_driver *driver = tty->driver;
if (test_bit(TTY_CLOSING, &tty->flags) ||
- test_bit(TTY_HUPPING, &tty->flags) ||
- test_bit(TTY_LDISC_CHANGING, &tty->flags))
+ test_bit(TTY_HUPPING, &tty->flags))
return -EIO;
if (driver->type == TTY_DRIVER_TYPE_PTY &&
@@ -1405,7 +1408,7 @@ static int tty_reopen(struct tty_struct *tty)
}
tty->count++;
- WARN_ON(!test_bit(TTY_LDISC, &tty->flags));
+ WARN_ON(!tty->ldisc);
return 0;
}
@@ -2202,7 +2205,7 @@ static int tty_fasync(int fd, struct file *filp, int on)
* FIXME: does not honour flow control ??
*
* Locking:
- * Called functions take tty_ldisc_lock
+ * Called functions take tty_ldiscs_lock
* current->signal->tty check is safe without locks
*
* FIXME: may race normal receive processing
@@ -2231,7 +2234,7 @@ static int tiocsti(struct tty_struct *tty, char __user *p)
*
* Copies the kernel idea of the window size into the user buffer.
*
- * Locking: tty->termios_mutex is taken to ensure the winsize data
+ * Locking: tty->winsize_mutex is taken to ensure the winsize data
* is consistent.
*/
@@ -2239,9 +2242,9 @@ static int tiocgwinsz(struct tty_struct *tty, struct winsize __user *arg)
{
int err;
- mutex_lock(&tty->termios_mutex);
+ mutex_lock(&tty->winsize_mutex);
err = copy_to_user(arg, &tty->winsize, sizeof(*arg));
- mutex_unlock(&tty->termios_mutex);
+ mutex_unlock(&tty->winsize_mutex);
return err ? -EFAULT: 0;
}
@@ -2262,7 +2265,7 @@ int tty_do_resize(struct tty_struct *tty, struct winsize *ws)
unsigned long flags;
/* Lock the tty */
- mutex_lock(&tty->termios_mutex);
+ mutex_lock(&tty->winsize_mutex);
if (!memcmp(ws, &tty->winsize, sizeof(*ws)))
goto done;
/* Get the PID values and reference them so we can
@@ -2277,7 +2280,7 @@ int tty_do_resize(struct tty_struct *tty, struct winsize *ws)
tty->winsize = *ws;
done:
- mutex_unlock(&tty->termios_mutex);
+ mutex_unlock(&tty->winsize_mutex);
return 0;
}
EXPORT_SYMBOL(tty_do_resize);
@@ -3016,8 +3019,10 @@ void initialize_tty_struct(struct tty_struct *tty,
tty->session = NULL;
tty->pgrp = NULL;
mutex_init(&tty->legacy_mutex);
- mutex_init(&tty->termios_mutex);
- mutex_init(&tty->ldisc_mutex);
+ mutex_init(&tty->throttle_mutex);
+ init_rwsem(&tty->termios_rwsem);
+ mutex_init(&tty->winsize_mutex);
+ init_ldsem(&tty->ldisc_sem);
init_waitqueue_head(&tty->write_wait);
init_waitqueue_head(&tty->read_wait);
INIT_WORK(&tty->hangup_work, do_tty_hangup);
diff --git a/drivers/tty/tty_ioctl.c b/drivers/tty/tty_ioctl.c
index 3500d41..03ba081 100644
--- a/drivers/tty/tty_ioctl.c
+++ b/drivers/tty/tty_ioctl.c
@@ -94,20 +94,20 @@ EXPORT_SYMBOL(tty_driver_flush_buffer);
* @tty: terminal
*
* Indicate that a tty should stop transmitting data down the stack.
- * Takes the termios mutex to protect against parallel throttle/unthrottle
+ * Takes the termios rwsem to protect against parallel throttle/unthrottle
* and also to ensure the driver can consistently reference its own
* termios data at this point when implementing software flow control.
*/
void tty_throttle(struct tty_struct *tty)
{
- mutex_lock(&tty->termios_mutex);
+ down_write(&tty->termios_rwsem);
/* check TTY_THROTTLED first so it indicates our state */
if (!test_and_set_bit(TTY_THROTTLED, &tty->flags) &&
tty->ops->throttle)
tty->ops->throttle(tty);
tty->flow_change = 0;
- mutex_unlock(&tty->termios_mutex);
+ up_write(&tty->termios_rwsem);
}
EXPORT_SYMBOL(tty_throttle);
@@ -116,7 +116,7 @@ EXPORT_SYMBOL(tty_throttle);
* @tty: terminal
*
* Indicate that a tty may continue transmitting data down the stack.
- * Takes the termios mutex to protect against parallel throttle/unthrottle
+ * Takes the termios rwsem to protect against parallel throttle/unthrottle
* and also to ensure the driver can consistently reference its own
* termios data at this point when implementing software flow control.
*
@@ -126,12 +126,12 @@ EXPORT_SYMBOL(tty_throttle);
void tty_unthrottle(struct tty_struct *tty)
{
- mutex_lock(&tty->termios_mutex);
+ down_write(&tty->termios_rwsem);
if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) &&
tty->ops->unthrottle)
tty->ops->unthrottle(tty);
tty->flow_change = 0;
- mutex_unlock(&tty->termios_mutex);
+ up_write(&tty->termios_rwsem);
}
EXPORT_SYMBOL(tty_unthrottle);
@@ -151,7 +151,7 @@ int tty_throttle_safe(struct tty_struct *tty)
{
int ret = 0;
- mutex_lock(&tty->termios_mutex);
+ mutex_lock(&tty->throttle_mutex);
if (!test_bit(TTY_THROTTLED, &tty->flags)) {
if (tty->flow_change != TTY_THROTTLE_SAFE)
ret = 1;
@@ -161,7 +161,7 @@ int tty_throttle_safe(struct tty_struct *tty)
tty->ops->throttle(tty);
}
}
- mutex_unlock(&tty->termios_mutex);
+ mutex_unlock(&tty->throttle_mutex);
return ret;
}
@@ -182,7 +182,7 @@ int tty_unthrottle_safe(struct tty_struct *tty)
{
int ret = 0;
- mutex_lock(&tty->termios_mutex);
+ mutex_lock(&tty->throttle_mutex);
if (test_bit(TTY_THROTTLED, &tty->flags)) {
if (tty->flow_change != TTY_UNTHROTTLE_SAFE)
ret = 1;
@@ -192,7 +192,7 @@ int tty_unthrottle_safe(struct tty_struct *tty)
tty->ops->unthrottle(tty);
}
}
- mutex_unlock(&tty->termios_mutex);
+ mutex_unlock(&tty->throttle_mutex);
return ret;
}
@@ -468,7 +468,7 @@ EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate);
* @obad: output baud rate
*
* Update the current termios data for the tty with the new speed
- * settings. The caller must hold the termios_mutex for the tty in
+ * settings. The caller must hold the termios_rwsem for the tty in
* question.
*/
@@ -528,7 +528,7 @@ EXPORT_SYMBOL(tty_termios_hw_change);
* is a bit of layering violation here with n_tty in terms of the
* internal knowledge of this function.
*
- * Locking: termios_mutex
+ * Locking: termios_rwsem
*/
int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios)
@@ -544,7 +544,7 @@ int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios)
/* FIXME: we need to decide on some locking/ordering semantics
for the set_termios notification eventually */
- mutex_lock(&tty->termios_mutex);
+ down_write(&tty->termios_rwsem);
old_termios = tty->termios;
tty->termios = *new_termios;
unset_locked_termios(&tty->termios, &old_termios, &tty->termios_locked);
@@ -586,7 +586,7 @@ int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios)
(ld->ops->set_termios)(tty, &old_termios);
tty_ldisc_deref(ld);
}
- mutex_unlock(&tty->termios_mutex);
+ up_write(&tty->termios_rwsem);
return 0;
}
EXPORT_SYMBOL_GPL(tty_set_termios);
@@ -601,7 +601,7 @@ EXPORT_SYMBOL_GPL(tty_set_termios);
* functions before using tty_set_termios to do the actual changes.
*
* Locking:
- * Called functions take ldisc and termios_mutex locks
+ * Called functions take ldisc and termios_rwsem locks
*/
static int set_termios(struct tty_struct *tty, void __user *arg, int opt)
@@ -613,9 +613,9 @@ static int set_termios(struct tty_struct *tty, void __user *arg, int opt)
if (retval)
return retval;
- mutex_lock(&tty->termios_mutex);
+ down_read(&tty->termios_rwsem);
tmp_termios = tty->termios;
- mutex_unlock(&tty->termios_mutex);
+ up_read(&tty->termios_rwsem);
if (opt & TERMIOS_TERMIO) {
if (user_termio_to_kernel_termios(&tmp_termios,
@@ -667,16 +667,16 @@ static int set_termios(struct tty_struct *tty, void __user *arg, int opt)
static void copy_termios(struct tty_struct *tty, struct ktermios *kterm)
{
- mutex_lock(&tty->termios_mutex);
+ down_read(&tty->termios_rwsem);
*kterm = tty->termios;
- mutex_unlock(&tty->termios_mutex);
+ up_read(&tty->termios_rwsem);
}
static void copy_termios_locked(struct tty_struct *tty, struct ktermios *kterm)
{
- mutex_lock(&tty->termios_mutex);
+ down_read(&tty->termios_rwsem);
*kterm = tty->termios_locked;
- mutex_unlock(&tty->termios_mutex);
+ up_read(&tty->termios_rwsem);
}
static int get_termio(struct tty_struct *tty, struct termio __user *termio)
@@ -723,10 +723,10 @@ static int set_termiox(struct tty_struct *tty, void __user *arg, int opt)
return -ERESTARTSYS;
}
- mutex_lock(&tty->termios_mutex);
+ down_write(&tty->termios_rwsem);
if (tty->ops->set_termiox)
tty->ops->set_termiox(tty, &tnew);
- mutex_unlock(&tty->termios_mutex);
+ up_write(&tty->termios_rwsem);
return 0;
}
@@ -761,13 +761,13 @@ static int get_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb)
{
struct sgttyb tmp;
- mutex_lock(&tty->termios_mutex);
+ down_read(&tty->termios_rwsem);
tmp.sg_ispeed = tty->termios.c_ispeed;
tmp.sg_ospeed = tty->termios.c_ospeed;
tmp.sg_erase = tty->termios.c_cc[VERASE];
tmp.sg_kill = tty->termios.c_cc[VKILL];
tmp.sg_flags = get_sgflags(tty);
- mutex_unlock(&tty->termios_mutex);
+ up_read(&tty->termios_rwsem);
return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0;
}
@@ -806,7 +806,7 @@ static void set_sgflags(struct ktermios *termios, int flags)
* Updates a terminal from the legacy BSD style terminal information
* structure.
*
- * Locking: termios_mutex
+ * Locking: termios_rwsem
*/
static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb)
@@ -822,7 +822,7 @@ static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb)
if (copy_from_user(&tmp, sgttyb, sizeof(tmp)))
return -EFAULT;
- mutex_lock(&tty->termios_mutex);
+ down_write(&tty->termios_rwsem);
termios = tty->termios;
termios.c_cc[VERASE] = tmp.sg_erase;
termios.c_cc[VKILL] = tmp.sg_kill;
@@ -832,7 +832,7 @@ static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb)
tty_termios_encode_baud_rate(&termios, termios.c_ispeed,
termios.c_ospeed);
#endif
- mutex_unlock(&tty->termios_mutex);
+ up_write(&tty->termios_rwsem);
tty_set_termios(tty, &termios);
return 0;
}
@@ -843,14 +843,14 @@ static int get_tchars(struct tty_struct *tty, struct tchars __user *tchars)
{
struct tchars tmp;
- mutex_lock(&tty->termios_mutex);
+ down_read(&tty->termios_rwsem);
tmp.t_intrc = tty->termios.c_cc[VINTR];
tmp.t_quitc = tty->termios.c_cc[VQUIT];
tmp.t_startc = tty->termios.c_cc[VSTART];
tmp.t_stopc = tty->termios.c_cc[VSTOP];
tmp.t_eofc = tty->termios.c_cc[VEOF];
tmp.t_brkc = tty->termios.c_cc[VEOL2]; /* what is brkc anyway? */
- mutex_unlock(&tty->termios_mutex);
+ up_read(&tty->termios_rwsem);
return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0;
}
@@ -860,14 +860,14 @@ static int set_tchars(struct tty_struct *tty, struct tchars __user *tchars)
if (copy_from_user(&tmp, tchars, sizeof(tmp)))
return -EFAULT;
- mutex_lock(&tty->termios_mutex);
+ down_write(&tty->termios_rwsem);
tty->termios.c_cc[VINTR] = tmp.t_intrc;
tty->termios.c_cc[VQUIT] = tmp.t_quitc;
tty->termios.c_cc[VSTART] = tmp.t_startc;
tty->termios.c_cc[VSTOP] = tmp.t_stopc;
tty->termios.c_cc[VEOF] = tmp.t_eofc;
tty->termios.c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */
- mutex_unlock(&tty->termios_mutex);
+ up_write(&tty->termios_rwsem);
return 0;
}
#endif
@@ -877,7 +877,7 @@ static int get_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars)
{
struct ltchars tmp;
- mutex_lock(&tty->termios_mutex);
+ down_read(&tty->termios_rwsem);
tmp.t_suspc = tty->termios.c_cc[VSUSP];
/* what is dsuspc anyway? */
tmp.t_dsuspc = tty->termios.c_cc[VSUSP];
@@ -886,7 +886,7 @@ static int get_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars)
tmp.t_flushc = tty->termios.c_cc[VEOL2];
tmp.t_werasc = tty->termios.c_cc[VWERASE];
tmp.t_lnextc = tty->termios.c_cc[VLNEXT];
- mutex_unlock(&tty->termios_mutex);
+ up_read(&tty->termios_rwsem);
return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0;
}
@@ -897,7 +897,7 @@ static int set_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars)
if (copy_from_user(&tmp, ltchars, sizeof(tmp)))
return -EFAULT;
- mutex_lock(&tty->termios_mutex);
+ down_write(&tty->termios_rwsem);
tty->termios.c_cc[VSUSP] = tmp.t_suspc;
/* what is dsuspc anyway? */
tty->termios.c_cc[VEOL2] = tmp.t_dsuspc;
@@ -906,7 +906,7 @@ static int set_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars)
tty->termios.c_cc[VEOL2] = tmp.t_flushc;
tty->termios.c_cc[VWERASE] = tmp.t_werasc;
tty->termios.c_cc[VLNEXT] = tmp.t_lnextc;
- mutex_unlock(&tty->termios_mutex);
+ up_write(&tty->termios_rwsem);
return 0;
}
#endif
@@ -946,7 +946,7 @@ static int send_prio_char(struct tty_struct *tty, char ch)
* @arg: enable/disable CLOCAL
*
* Perform a change to the CLOCAL state and call into the driver
- * layer to make it visible. All done with the termios mutex
+ * layer to make it visible. All done with the termios rwsem
*/
static int tty_change_softcar(struct tty_struct *tty, int arg)
@@ -955,7 +955,7 @@ static int tty_change_softcar(struct tty_struct *tty, int arg)
int bit = arg ? CLOCAL : 0;
struct ktermios old;
- mutex_lock(&tty->termios_mutex);
+ down_write(&tty->termios_rwsem);
old = tty->termios;
tty->termios.c_cflag &= ~CLOCAL;
tty->termios.c_cflag |= bit;
@@ -963,7 +963,7 @@ static int tty_change_softcar(struct tty_struct *tty, int arg)
tty->ops->set_termios(tty, &old);
if ((tty->termios.c_cflag & CLOCAL) != bit)
ret = -EINVAL;
- mutex_unlock(&tty->termios_mutex);
+ up_write(&tty->termios_rwsem);
return ret;
}
@@ -1066,9 +1066,9 @@ int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
if (user_termios_to_kernel_termios(&kterm,
(struct termios __user *) arg))
return -EFAULT;
- mutex_lock(&real_tty->termios_mutex);
+ down_write(&real_tty->termios_rwsem);
real_tty->termios_locked = kterm;
- mutex_unlock(&real_tty->termios_mutex);
+ up_write(&real_tty->termios_rwsem);
return 0;
#else
case TIOCGLCKTRMIOS:
@@ -1083,9 +1083,9 @@ int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
if (user_termios_to_kernel_termios_1(&kterm,
(struct termios __user *) arg))
return -EFAULT;
- mutex_lock(&real_tty->termios_mutex);
+ down_write(&real_tty->termios_rwsem);
real_tty->termios_locked = kterm;
- mutex_unlock(&real_tty->termios_mutex);
+ up_write(&real_tty->termios_rwsem);
return ret;
#endif
#ifdef TCGETX
@@ -1093,9 +1093,9 @@ int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
struct termiox ktermx;
if (real_tty->termiox == NULL)
return -EINVAL;
- mutex_lock(&real_tty->termios_mutex);
+ down_read(&real_tty->termios_rwsem);
memcpy(&ktermx, real_tty->termiox, sizeof(struct termiox));
- mutex_unlock(&real_tty->termios_mutex);
+ up_read(&real_tty->termios_rwsem);
if (copy_to_user(p, &ktermx, sizeof(struct termiox)))
ret = -EFAULT;
return ret;
diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index 1afe192..6458e11 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -31,14 +31,20 @@
#define tty_ldisc_debug(tty, f, args...)
#endif
+/* lockdep nested classes for tty->ldisc_sem */
+enum {
+ LDISC_SEM_NORMAL,
+ LDISC_SEM_OTHER,
+};
+
+
/*
* This guards the refcounted line discipline lists. The lock
* must be taken with irqs off because there are hangup path
* callers who will do ldisc lookups and cannot sleep.
*/
-static DEFINE_RAW_SPINLOCK(tty_ldisc_lock);
-static DECLARE_WAIT_QUEUE_HEAD(tty_ldisc_wait);
+static DEFINE_RAW_SPINLOCK(tty_ldiscs_lock);
/* Line disc dispatch table */
static struct tty_ldisc_ops *tty_ldiscs[NR_LDISCS];
@@ -52,7 +58,7 @@ static struct tty_ldisc_ops *tty_ldiscs[NR_LDISCS];
* from this point onwards.
*
* Locking:
- * takes tty_ldisc_lock to guard against ldisc races
+ * takes tty_ldiscs_lock to guard against ldisc races
*/
int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc)
@@ -63,11 +69,11 @@ int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc)
if (disc < N_TTY || disc >= NR_LDISCS)
return -EINVAL;
- raw_spin_lock_irqsave(&tty_ldisc_lock, flags);
+ raw_spin_lock_irqsave(&tty_ldiscs_lock, flags);
tty_ldiscs[disc] = new_ldisc;
new_ldisc->num = disc;
new_ldisc->refcount = 0;
- raw_spin_unlock_irqrestore(&tty_ldisc_lock, flags);
+ raw_spin_unlock_irqrestore(&tty_ldiscs_lock, flags);
return ret;
}
@@ -82,7 +88,7 @@ EXPORT_SYMBOL(tty_register_ldisc);
* currently in use.
*
* Locking:
- * takes tty_ldisc_lock to guard against ldisc races
+ * takes tty_ldiscs_lock to guard against ldisc races
*/
int tty_unregister_ldisc(int disc)
@@ -93,12 +99,12 @@ int tty_unregister_ldisc(int disc)
if (disc < N_TTY || disc >= NR_LDISCS)
return -EINVAL;
- raw_spin_lock_irqsave(&tty_ldisc_lock, flags);
+ raw_spin_lock_irqsave(&tty_ldiscs_lock, flags);
if (tty_ldiscs[disc]->refcount)
ret = -EBUSY;
else
tty_ldiscs[disc] = NULL;
- raw_spin_unlock_irqrestore(&tty_ldisc_lock, flags);
+ raw_spin_unlock_irqrestore(&tty_ldiscs_lock, flags);
return ret;
}
@@ -109,7 +115,7 @@ static struct tty_ldisc_ops *get_ldops(int disc)
unsigned long flags;
struct tty_ldisc_ops *ldops, *ret;
- raw_spin_lock_irqsave(&tty_ldisc_lock, flags);
+ raw_spin_lock_irqsave(&tty_ldiscs_lock, flags);
ret = ERR_PTR(-EINVAL);
ldops = tty_ldiscs[disc];
if (ldops) {
@@ -119,7 +125,7 @@ static struct tty_ldisc_ops *get_ldops(int disc)
ret = ldops;
}
}
- raw_spin_unlock_irqrestore(&tty_ldisc_lock, flags);
+ raw_spin_unlock_irqrestore(&tty_ldiscs_lock, flags);
return ret;
}
@@ -127,10 +133,10 @@ static void put_ldops(struct tty_ldisc_ops *ldops)
{
unsigned long flags;
- raw_spin_lock_irqsave(&tty_ldisc_lock, flags);
+ raw_spin_lock_irqsave(&tty_ldiscs_lock, flags);
ldops->refcount--;
module_put(ldops->owner);
- raw_spin_unlock_irqrestore(&tty_ldisc_lock, flags);
+ raw_spin_unlock_irqrestore(&tty_ldiscs_lock, flags);
}
/**
@@ -143,10 +149,10 @@ static void put_ldops(struct tty_ldisc_ops *ldops)
* available
*
* Locking:
- * takes tty_ldisc_lock to guard against ldisc races
+ * takes tty_ldiscs_lock to guard against ldisc races
*/
-static struct tty_ldisc *tty_ldisc_get(int disc)
+static struct tty_ldisc *tty_ldisc_get(struct tty_struct *tty, int disc)
{
struct tty_ldisc *ld;
struct tty_ldisc_ops *ldops;
@@ -173,8 +179,7 @@ static struct tty_ldisc *tty_ldisc_get(int disc)
}
ld->ops = ldops;
- atomic_set(&ld->users, 1);
- init_waitqueue_head(&ld->wq_idle);
+ ld->tty = tty;
return ld;
}
@@ -186,20 +191,11 @@ static struct tty_ldisc *tty_ldisc_get(int disc)
*/
static inline void tty_ldisc_put(struct tty_ldisc *ld)
{
- unsigned long flags;
-
if (WARN_ON_ONCE(!ld))
return;
- raw_spin_lock_irqsave(&tty_ldisc_lock, flags);
-
- /* unreleased reader reference(s) will cause this WARN */
- WARN_ON(!atomic_dec_and_test(&ld->users));
-
- ld->ops->refcount--;
- module_put(ld->ops->owner);
+ put_ldops(ld->ops);
kfree(ld);
- raw_spin_unlock_irqrestore(&tty_ldisc_lock, flags);
}
static void *tty_ldiscs_seq_start(struct seq_file *m, loff_t *pos)
@@ -251,34 +247,6 @@ const struct file_operations tty_ldiscs_proc_fops = {
};
/**
- * tty_ldisc_try - internal helper
- * @tty: the tty
- *
- * Make a single attempt to grab and bump the refcount on
- * the tty ldisc. Return 0 on failure or 1 on success. This is
- * used to implement both the waiting and non waiting versions
- * of tty_ldisc_ref
- *
- * Locking: takes tty_ldisc_lock
- */
-
-static struct tty_ldisc *tty_ldisc_try(struct tty_struct *tty)
-{
- unsigned long flags;
- struct tty_ldisc *ld;
-
- /* FIXME: this allows reference acquire after TTY_LDISC is cleared */
- raw_spin_lock_irqsave(&tty_ldisc_lock, flags);
- ld = NULL;
- if (test_bit(TTY_LDISC, &tty->flags) && tty->ldisc) {
- ld = tty->ldisc;
- atomic_inc(&ld->users);
- }
- raw_spin_unlock_irqrestore(&tty_ldisc_lock, flags);
- return ld;
-}
-
-/**
* tty_ldisc_ref_wait - wait for the tty ldisc
* @tty: tty device
*
@@ -291,16 +259,15 @@ static struct tty_ldisc *tty_ldisc_try(struct tty_struct *tty)
* against a discipline change, such as an existing ldisc reference
* (which we check for)
*
- * Locking: call functions take tty_ldisc_lock
+ * Note: only callable from a file_operations routine (which
+ * guarantees tty->ldisc != NULL when the lock is acquired).
*/
struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *tty)
{
- struct tty_ldisc *ld;
-
- /* wait_event is a macro */
- wait_event(tty_ldisc_wait, (ld = tty_ldisc_try(tty)) != NULL);
- return ld;
+ ldsem_down_read(&tty->ldisc_sem, MAX_SCHEDULE_TIMEOUT);
+ WARN_ON(!tty->ldisc);
+ return tty->ldisc;
}
EXPORT_SYMBOL_GPL(tty_ldisc_ref_wait);
@@ -311,13 +278,18 @@ EXPORT_SYMBOL_GPL(tty_ldisc_ref_wait);
* Dereference the line discipline for the terminal and take a
* reference to it. If the line discipline is in flux then
* return NULL. Can be called from IRQ and timer functions.
- *
- * Locking: called functions take tty_ldisc_lock
*/
struct tty_ldisc *tty_ldisc_ref(struct tty_struct *tty)
{
- return tty_ldisc_try(tty);
+ struct tty_ldisc *ld = NULL;
+
+ if (ldsem_down_read_trylock(&tty->ldisc_sem)) {
+ ld = tty->ldisc;
+ if (!ld)
+ ldsem_up_read(&tty->ldisc_sem);
+ }
+ return ld;
}
EXPORT_SYMBOL_GPL(tty_ldisc_ref);
@@ -327,48 +299,91 @@ EXPORT_SYMBOL_GPL(tty_ldisc_ref);
*
* Undoes the effect of tty_ldisc_ref or tty_ldisc_ref_wait. May
* be called in IRQ context.
- *
- * Locking: takes tty_ldisc_lock
*/
void tty_ldisc_deref(struct tty_ldisc *ld)
{
- unsigned long flags;
+ ldsem_up_read(&ld->tty->ldisc_sem);
+}
+EXPORT_SYMBOL_GPL(tty_ldisc_deref);
- if (WARN_ON_ONCE(!ld))
- return;
- raw_spin_lock_irqsave(&tty_ldisc_lock, flags);
- /*
- * WARNs if one-too-many reader references were released
- * - the last reference must be released with tty_ldisc_put
- */
- WARN_ON(atomic_dec_and_test(&ld->users));
- raw_spin_unlock_irqrestore(&tty_ldisc_lock, flags);
+static inline int __lockfunc
+tty_ldisc_lock(struct tty_struct *tty, unsigned long timeout)
+{
+ return ldsem_down_write(&tty->ldisc_sem, timeout);
+}
- if (waitqueue_active(&ld->wq_idle))
- wake_up(&ld->wq_idle);
+static inline int __lockfunc
+tty_ldisc_lock_nested(struct tty_struct *tty, unsigned long timeout)
+{
+ return ldsem_down_write_nested(&tty->ldisc_sem,
+ LDISC_SEM_OTHER, timeout);
}
-EXPORT_SYMBOL_GPL(tty_ldisc_deref);
-/**
- * tty_ldisc_enable - allow ldisc use
- * @tty: terminal to activate ldisc on
- *
- * Set the TTY_LDISC flag when the line discipline can be called
- * again. Do necessary wakeups for existing sleepers. Clear the LDISC
- * changing flag to indicate any ldisc change is now over.
- *
- * Note: nobody should set the TTY_LDISC bit except via this function.
- * Clearing directly is allowed.
- */
+static inline void tty_ldisc_unlock(struct tty_struct *tty)
+{
+ return ldsem_up_write(&tty->ldisc_sem);
+}
-static void tty_ldisc_enable(struct tty_struct *tty)
+static int __lockfunc
+tty_ldisc_lock_pair_timeout(struct tty_struct *tty, struct tty_struct *tty2,
+ unsigned long timeout)
+{
+ int ret;
+
+ if (tty < tty2) {
+ ret = tty_ldisc_lock(tty, timeout);
+ if (ret) {
+ ret = tty_ldisc_lock_nested(tty2, timeout);
+ if (!ret)
+ tty_ldisc_unlock(tty);
+ }
+ } else {
+ /* if this is possible, it has lots of implications */
+ WARN_ON_ONCE(tty == tty2);
+ if (tty2 && tty != tty2) {
+ ret = tty_ldisc_lock(tty2, timeout);
+ if (ret) {
+ ret = tty_ldisc_lock_nested(tty, timeout);
+ if (!ret)
+ tty_ldisc_unlock(tty2);
+ }
+ } else
+ ret = tty_ldisc_lock(tty, timeout);
+ }
+
+ if (!ret)
+ return -EBUSY;
+
+ set_bit(TTY_LDISC_HALTED, &tty->flags);
+ if (tty2)
+ set_bit(TTY_LDISC_HALTED, &tty2->flags);
+ return 0;
+}
+
+static void __lockfunc
+tty_ldisc_lock_pair(struct tty_struct *tty, struct tty_struct *tty2)
+{
+ tty_ldisc_lock_pair_timeout(tty, tty2, MAX_SCHEDULE_TIMEOUT);
+}
+
+static void __lockfunc tty_ldisc_unlock_pair(struct tty_struct *tty,
+ struct tty_struct *tty2)
+{
+ tty_ldisc_unlock(tty);
+ if (tty2)
+ tty_ldisc_unlock(tty2);
+}
+
+static void __lockfunc tty_ldisc_enable_pair(struct tty_struct *tty,
+ struct tty_struct *tty2)
{
clear_bit(TTY_LDISC_HALTED, &tty->flags);
- set_bit(TTY_LDISC, &tty->flags);
- clear_bit(TTY_LDISC_CHANGING, &tty->flags);
- wake_up(&tty_ldisc_wait);
+ if (tty2)
+ clear_bit(TTY_LDISC_HALTED, &tty2->flags);
+
+ tty_ldisc_unlock_pair(tty, tty2);
}
/**
@@ -400,14 +415,14 @@ EXPORT_SYMBOL_GPL(tty_ldisc_flush);
* they are not on hot paths so a little discipline won't do
* any harm.
*
- * Locking: takes termios_mutex
+ * Locking: takes termios_rwsem
*/
static void tty_set_termios_ldisc(struct tty_struct *tty, int num)
{
- mutex_lock(&tty->termios_mutex);
+ down_write(&tty->termios_rwsem);
tty->termios.c_line = num;
- mutex_unlock(&tty->termios_mutex);
+ up_write(&tty->termios_rwsem);
}
/**
@@ -468,14 +483,14 @@ static void tty_ldisc_restore(struct tty_struct *tty, struct tty_ldisc *old)
int r;
/* There is an outstanding reference here so this is safe */
- old = tty_ldisc_get(old->ops->num);
+ old = tty_ldisc_get(tty, old->ops->num);
WARN_ON(IS_ERR(old));
tty->ldisc = old;
tty_set_termios_ldisc(tty, old->ops->num);
if (tty_ldisc_open(tty, old) < 0) {
tty_ldisc_put(old);
/* This driver is always present */
- new_ldisc = tty_ldisc_get(N_TTY);
+ new_ldisc = tty_ldisc_get(tty, N_TTY);
if (IS_ERR(new_ldisc))
panic("n_tty: get");
tty->ldisc = new_ldisc;
@@ -489,101 +504,6 @@ static void tty_ldisc_restore(struct tty_struct *tty, struct tty_ldisc *old)
}
/**
- * tty_ldisc_wait_idle - wait for the ldisc to become idle
- * @tty: tty to wait for
- * @timeout: for how long to wait at most
- *
- * Wait for the line discipline to become idle. The discipline must
- * have been halted for this to guarantee it remains idle.
- */
-static int tty_ldisc_wait_idle(struct tty_struct *tty, long timeout)
-{
- long ret;
- ret = wait_event_timeout(tty->ldisc->wq_idle,
- atomic_read(&tty->ldisc->users) == 1, timeout);
- return ret > 0 ? 0 : -EBUSY;
-}
-
-/**
- * tty_ldisc_halt - shut down the line discipline
- * @tty: tty device
- * @o_tty: paired pty device (can be NULL)
- * @timeout: # of jiffies to wait for ldisc refs to be released
- *
- * Shut down the line discipline and work queue for this tty device and
- * its paired pty (if exists). Clearing the TTY_LDISC flag ensures
- * no further references can be obtained, while waiting for existing
- * references to be released ensures no more data is fed to the ldisc.
- *
- * You need to do a 'flush_scheduled_work()' (outside the ldisc_mutex)
- * in order to make sure any currently executing ldisc work is also
- * flushed.
- */
-
-static int tty_ldisc_halt(struct tty_struct *tty, struct tty_struct *o_tty,
- long timeout)
-{
- int retval;
-
- clear_bit(TTY_LDISC, &tty->flags);
- if (o_tty)
- clear_bit(TTY_LDISC, &o_tty->flags);
-
- retval = tty_ldisc_wait_idle(tty, timeout);
- if (!retval && o_tty)
- retval = tty_ldisc_wait_idle(o_tty, timeout);
- if (retval)
- return retval;
-
- set_bit(TTY_LDISC_HALTED, &tty->flags);
- if (o_tty)
- set_bit(TTY_LDISC_HALTED, &o_tty->flags);
-
- return 0;
-}
-
-/**
- * tty_ldisc_hangup_halt - halt the line discipline for hangup
- * @tty: tty being hung up
- *
- * Shut down the line discipline and work queue for the tty device
- * being hungup. Clear the TTY_LDISC flag to ensure no further
- * references can be obtained and wait for remaining references to be
- * released to ensure no more data is fed to this ldisc.
- * Caller must hold legacy and ->ldisc_mutex.
- *
- * NB: tty_set_ldisc() is prevented from changing the ldisc concurrently
- * with this function by checking the TTY_HUPPING flag.
- */
-static bool tty_ldisc_hangup_halt(struct tty_struct *tty)
-{
- char cur_n[TASK_COMM_LEN], tty_n[64];
- long timeout = 3 * HZ;
-
- clear_bit(TTY_LDISC, &tty->flags);
-
- if (tty->ldisc) { /* Not yet closed */
- tty_unlock(tty);
-
- while (tty_ldisc_wait_idle(tty, timeout) == -EBUSY) {
- timeout = MAX_SCHEDULE_TIMEOUT;
- printk_ratelimited(KERN_WARNING
- "%s: waiting (%s) for %s took too long, but we keep waiting...\n",
- __func__, get_task_comm(cur_n, current),
- tty_name(tty, tty_n));
- }
-
- set_bit(TTY_LDISC_HALTED, &tty->flags);
-
- /* must reacquire both locks and preserve lock order */
- mutex_unlock(&tty->ldisc_mutex);
- tty_lock(tty);
- mutex_lock(&tty->ldisc_mutex);
- }
- return !!tty->ldisc;
-}
-
-/**
* tty_set_ldisc - set line discipline
* @tty: the terminal to set
* @ldisc: the line discipline
@@ -592,110 +512,49 @@ static bool tty_ldisc_hangup_halt(struct tty_struct *tty)
* context. The ldisc change logic has to protect itself against any
* overlapping ldisc change (including on the other end of pty pairs),
* the close of one side of a tty/pty pair, and eventually hangup.
- *
- * Locking: takes tty_ldisc_lock, termios_mutex
*/
int tty_set_ldisc(struct tty_struct *tty, int ldisc)
{
int retval;
- struct tty_ldisc *o_ldisc, *new_ldisc;
- struct tty_struct *o_tty;
+ struct tty_ldisc *old_ldisc, *new_ldisc;
+ struct tty_struct *o_tty = tty->link;
- new_ldisc = tty_ldisc_get(ldisc);
+ new_ldisc = tty_ldisc_get(tty, ldisc);
if (IS_ERR(new_ldisc))
return PTR_ERR(new_ldisc);
- tty_lock(tty);
- /*
- * We need to look at the tty locking here for pty/tty pairs
- * when both sides try to change in parallel.
- */
-
- o_tty = tty->link; /* o_tty is the pty side or NULL */
-
+ retval = tty_ldisc_lock_pair_timeout(tty, o_tty, 5 * HZ);
+ if (retval) {
+ tty_ldisc_put(new_ldisc);
+ return retval;
+ }
/*
* Check the no-op case
*/
if (tty->ldisc->ops->num == ldisc) {
- tty_unlock(tty);
+ tty_ldisc_enable_pair(tty, o_tty);
tty_ldisc_put(new_ldisc);
return 0;
}
- mutex_lock(&tty->ldisc_mutex);
-
- /*
- * We could be midstream of another ldisc change which has
- * dropped the lock during processing. If so we need to wait.
- */
-
- while (test_bit(TTY_LDISC_CHANGING, &tty->flags)) {
- mutex_unlock(&tty->ldisc_mutex);
- tty_unlock(tty);
- wait_event(tty_ldisc_wait,
- test_bit(TTY_LDISC_CHANGING, &tty->flags) == 0);
- tty_lock(tty);
- mutex_lock(&tty->ldisc_mutex);
- }
-
- set_bit(TTY_LDISC_CHANGING, &tty->flags);
-
- /*
- * No more input please, we are switching. The new ldisc
- * will update this value in the ldisc open function
- */
-
- tty->receive_room = 0;
-
- o_ldisc = tty->ldisc;
-
- tty_unlock(tty);
- /*
- * Make sure we don't change while someone holds a
- * reference to the line discipline. The TTY_LDISC bit
- * prevents anyone taking a reference once it is clear.
- * We need the lock to avoid racing reference takers.
- *
- * We must clear the TTY_LDISC bit here to avoid a livelock
- * with a userspace app continually trying to use the tty in
- * parallel to the change and re-referencing the tty.
- */
-
- retval = tty_ldisc_halt(tty, o_tty, 5 * HZ);
-
- /*
- * Wait for hangup to complete, if pending.
- * We must drop the mutex here in case a hangup is also in process.
- */
-
- mutex_unlock(&tty->ldisc_mutex);
-
- flush_work(&tty->hangup_work);
-
+ old_ldisc = tty->ldisc;
tty_lock(tty);
- mutex_lock(&tty->ldisc_mutex);
-
- /* handle wait idle failure locked */
- if (retval) {
- tty_ldisc_put(new_ldisc);
- goto enable;
- }
- if (test_bit(TTY_HUPPING, &tty->flags)) {
+ if (test_bit(TTY_HUPPING, &tty->flags) ||
+ test_bit(TTY_HUPPED, &tty->flags)) {
/* We were raced by the hangup method. It will have stomped
the ldisc data and closed the ldisc down */
- clear_bit(TTY_LDISC_CHANGING, &tty->flags);
- mutex_unlock(&tty->ldisc_mutex);
+ tty_ldisc_enable_pair(tty, o_tty);
tty_ldisc_put(new_ldisc);
tty_unlock(tty);
return -EIO;
}
- /* Shutdown the current discipline. */
- tty_ldisc_close(tty, o_ldisc);
+ /* Shutdown the old discipline. */
+ tty_ldisc_close(tty, old_ldisc);
/* Now set up the new line discipline. */
tty->ldisc = new_ldisc;
@@ -705,26 +564,24 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
if (retval < 0) {
/* Back to the old one or N_TTY if we can't */
tty_ldisc_put(new_ldisc);
- tty_ldisc_restore(tty, o_ldisc);
+ tty_ldisc_restore(tty, old_ldisc);
}
- /* At this point we hold a reference to the new ldisc and a
- a reference to the old ldisc. If we ended up flipping back
- to the existing ldisc we have two references to it */
-
- if (tty->ldisc->ops->num != o_ldisc->ops->num && tty->ops->set_ldisc)
+ if (tty->ldisc->ops->num != old_ldisc->ops->num && tty->ops->set_ldisc)
tty->ops->set_ldisc(tty);
- tty_ldisc_put(o_ldisc);
+ /* At this point we hold a reference to the new ldisc and a
+ reference to the old ldisc, or we hold two references to
+ the old ldisc (if it was restored as part of error cleanup
+ above). In either case, releasing a single reference from
+ the old ldisc is correct. */
+
+ tty_ldisc_put(old_ldisc);
-enable:
/*
* Allow ldisc referencing to occur again
*/
-
- tty_ldisc_enable(tty);
- if (o_tty)
- tty_ldisc_enable(o_tty);
+ tty_ldisc_enable_pair(tty, o_tty);
/* Restart the work queue in case no characters kick it off. Safe if
already running */
@@ -732,7 +589,6 @@ enable:
if (o_tty)
schedule_work(&o_tty->port->buf.work);
- mutex_unlock(&tty->ldisc_mutex);
tty_unlock(tty);
return retval;
}
@@ -746,11 +602,11 @@ enable:
static void tty_reset_termios(struct tty_struct *tty)
{
- mutex_lock(&tty->termios_mutex);
+ down_write(&tty->termios_rwsem);
tty->termios = tty->driver->init_termios;
tty->termios.c_ispeed = tty_termios_input_baud_rate(&tty->termios);
tty->termios.c_ospeed = tty_termios_baud_rate(&tty->termios);
- mutex_unlock(&tty->termios_mutex);
+ up_write(&tty->termios_rwsem);
}
@@ -765,7 +621,7 @@ static void tty_reset_termios(struct tty_struct *tty)
static int tty_ldisc_reinit(struct tty_struct *tty, int ldisc)
{
- struct tty_ldisc *ld = tty_ldisc_get(ldisc);
+ struct tty_ldisc *ld = tty_ldisc_get(tty, ldisc);
if (IS_ERR(ld))
return -1;
@@ -804,14 +660,8 @@ void tty_ldisc_hangup(struct tty_struct *tty)
tty_ldisc_debug(tty, "closing ldisc: %p\n", tty->ldisc);
- /*
- * FIXME! What are the locking issues here? This may me overdoing
- * things... This question is especially important now that we've
- * removed the irqlock.
- */
ld = tty_ldisc_ref(tty);
if (ld != NULL) {
- /* We may have no line discipline at this point */
if (ld->ops->flush_buffer)
ld->ops->flush_buffer(tty);
tty_driver_flush_buffer(tty);
@@ -822,21 +672,22 @@ void tty_ldisc_hangup(struct tty_struct *tty)
ld->ops->hangup(tty);
tty_ldisc_deref(ld);
}
- /*
- * FIXME: Once we trust the LDISC code better we can wait here for
- * ldisc completion and fix the driver call race
- */
+
wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
wake_up_interruptible_poll(&tty->read_wait, POLLIN);
+
+ tty_unlock(tty);
+
/*
* Shutdown the current line discipline, and reset it to
* N_TTY if need be.
*
* Avoid racing set_ldisc or tty_ldisc_release
*/
- mutex_lock(&tty->ldisc_mutex);
+ tty_ldisc_lock_pair(tty, tty->link);
+ tty_lock(tty);
- if (tty_ldisc_hangup_halt(tty)) {
+ if (tty->ldisc) {
/* At this point we have a halted ldisc; we want to close it and
reopen a new ldisc. We could defer the reopen to the next
@@ -855,9 +706,8 @@ void tty_ldisc_hangup(struct tty_struct *tty)
BUG_ON(tty_ldisc_reinit(tty, N_TTY));
WARN_ON(tty_ldisc_open(tty, tty->ldisc));
}
- tty_ldisc_enable(tty);
}
- mutex_unlock(&tty->ldisc_mutex);
+ tty_ldisc_enable_pair(tty, tty->link);
if (reset)
tty_reset_termios(tty);
@@ -889,15 +739,12 @@ int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty)
tty_ldisc_close(tty, ld);
return retval;
}
- tty_ldisc_enable(o_tty);
}
- tty_ldisc_enable(tty);
return 0;
}
static void tty_ldisc_kill(struct tty_struct *tty)
{
- mutex_lock(&tty->ldisc_mutex);
/*
* Now kill off the ldisc
*/
@@ -908,7 +755,6 @@ static void tty_ldisc_kill(struct tty_struct *tty)
/* Ensure the next open requests the N_TTY ldisc */
tty_set_termios_ldisc(tty, N_TTY);
- mutex_unlock(&tty->ldisc_mutex);
}
/**
@@ -930,15 +776,16 @@ void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty)
tty_ldisc_debug(tty, "closing ldisc: %p\n", tty->ldisc);
- tty_ldisc_halt(tty, o_tty, MAX_SCHEDULE_TIMEOUT);
-
+ tty_ldisc_lock_pair(tty, o_tty);
tty_lock_pair(tty, o_tty);
- /* This will need doing differently if we need to lock */
+
tty_ldisc_kill(tty);
if (o_tty)
tty_ldisc_kill(o_tty);
tty_unlock_pair(tty, o_tty);
+ tty_ldisc_unlock_pair(tty, o_tty);
+
/* And the memory resources remaining (buffers, termios) will be
disposed of when the kref hits zero */
@@ -955,7 +802,7 @@ void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty)
void tty_ldisc_init(struct tty_struct *tty)
{
- struct tty_ldisc *ld = tty_ldisc_get(N_TTY);
+ struct tty_ldisc *ld = tty_ldisc_get(tty, N_TTY);
if (IS_ERR(ld))
panic("n_tty: init_tty");
tty->ldisc = ld;
diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c
index a9af1b9a..d0e3a44 100644
--- a/drivers/tty/vt/keyboard.c
+++ b/drivers/tty/vt/keyboard.c
@@ -132,12 +132,6 @@ static int shift_state = 0;
static unsigned char ledstate = 0xff; /* undefined */
static unsigned char ledioctl;
-static struct ledptr {
- unsigned int *addr;
- unsigned int mask;
- unsigned char valid:1;
-} ledptrs[3];
-
/*
* Notifier list for console keyboard events
*/
@@ -994,24 +988,11 @@ void setledstate(struct kbd_struct *kbd, unsigned int led)
static inline unsigned char getleds(void)
{
struct kbd_struct *kbd = kbd_table + fg_console;
- unsigned char leds;
- int i;
if (kbd->ledmode == LED_SHOW_IOCTL)
return ledioctl;
- leds = kbd->ledflagstate;
-
- if (kbd->ledmode == LED_SHOW_MEM) {
- for (i = 0; i < 3; i++)
- if (ledptrs[i].valid) {
- if (*ledptrs[i].addr & ledptrs[i].mask)
- leds |= (1 << i);
- else
- leds &= ~(1 << i);
- }
- }
- return leds;
+ return kbd->ledflagstate;
}
static int kbd_update_leds_helper(struct input_handle *handle, void *data)
diff --git a/drivers/tty/vt/selection.c b/drivers/tty/vt/selection.c
index 60b7b69..ea27804 100644
--- a/drivers/tty/vt/selection.c
+++ b/drivers/tty/vt/selection.c
@@ -24,6 +24,7 @@
#include <linux/selection.h>
#include <linux/tiocl.h>
#include <linux/console.h>
+#include <linux/tty_flip.h>
/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
#define isspace(c) ((c) == ' ')
@@ -346,8 +347,8 @@ int paste_selection(struct tty_struct *tty)
console_unlock();
ld = tty_ldisc_ref_wait(tty);
+ tty_buffer_lock_exclusive(&vc->port);
- /* FIXME: this is completely unsafe */
add_wait_queue(&vc->paste_wait, &wait);
while (sel_buffer && sel_buffer_lth > pasted) {
set_current_state(TASK_INTERRUPTIBLE);
@@ -356,13 +357,14 @@ int paste_selection(struct tty_struct *tty)
continue;
}
count = sel_buffer_lth - pasted;
- count = min(count, tty->receive_room);
- ld->ops->receive_buf(tty, sel_buffer + pasted, NULL, count);
+ count = tty_ldisc_receive_buf(ld, sel_buffer + pasted, NULL,
+ count);
pasted += count;
}
remove_wait_queue(&vc->paste_wait, &wait);
__set_current_state(TASK_RUNNING);
+ tty_buffer_unlock_exclusive(&vc->port);
tty_ldisc_deref(ld);
return 0;
}
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index c677829..9a8e8c5 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -828,7 +828,7 @@ static inline int resize_screen(struct vc_data *vc, int width, int height,
* If the caller passes a tty structure then update the termios winsize
* information and perform any necessary signal handling.
*
- * Caller must hold the console semaphore. Takes the termios mutex and
+ * Caller must hold the console semaphore. Takes the termios rwsem and
* ctrl_lock of the tty IFF a tty is passed.
*/
@@ -972,7 +972,7 @@ int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
* the actual work.
*
* Takes the console sem and the called methods then take the tty
- * termios_mutex and the tty ctrl_lock in that order.
+ * termios_rwsem and the tty ctrl_lock in that order.
*/
static int vt_resize(struct tty_struct *tty, struct winsize *ws)
{
@@ -2809,8 +2809,10 @@ static void con_shutdown(struct tty_struct *tty)
console_unlock();
}
+static int default_color = 7; /* white */
static int default_italic_color = 2; // green (ASCII)
static int default_underline_color = 3; // cyan (ASCII)
+module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
@@ -2832,7 +2834,7 @@ static void vc_init(struct vc_data *vc, unsigned int rows,
vc->vc_palette[k++] = default_grn[j] ;
vc->vc_palette[k++] = default_blu[j] ;
}
- vc->vc_def_color = 0x07; /* white */
+ vc->vc_def_color = default_color;
vc->vc_ulcolor = default_underline_color;
vc->vc_itcolor = default_italic_color;
vc->vc_halfcolor = 0x08; /* grey */
OpenPOWER on IntegriCloud