diff options
Diffstat (limited to 'drivers/char/vme_scc.c')
| -rw-r--r-- | drivers/char/vme_scc.c | 1035 |
1 files changed, 1035 insertions, 0 deletions
diff --git a/drivers/char/vme_scc.c b/drivers/char/vme_scc.c new file mode 100644 index 0000000..1718b3c --- /dev/null +++ b/drivers/char/vme_scc.c @@ -0,0 +1,1035 @@ +/* + * drivers/char/vme_scc.c: MVME147, MVME162, BVME6000 SCC serial ports + * implementation. + * Copyright 1999 Richard Hirst <richard@sleepie.demon.co.uk> + * + * Based on atari_SCC.c which was + * Copyright 1994-95 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> + * Partially based on PC-Linux serial.c by Linus Torvalds and Theodore Ts'o + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + * + */ + +#include <linux/module.h> +#include <linux/kdev_t.h> +#include <asm/io.h> +#include <linux/kernel.h> +#include <linux/ioport.h> +#include <linux/interrupt.h> +#include <linux/errno.h> +#include <linux/tty.h> +#include <linux/tty_flip.h> +#include <linux/mm.h> +#include <linux/serial.h> +#include <linux/fcntl.h> +#include <linux/major.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/miscdevice.h> +#include <linux/console.h> +#include <linux/init.h> +#include <asm/setup.h> +#include <asm/bootinfo.h> + +#ifdef CONFIG_MVME147_SCC +#include <asm/mvme147hw.h> +#endif +#ifdef CONFIG_MVME162_SCC +#include <asm/mvme16xhw.h> +#endif +#ifdef CONFIG_BVME6000_SCC +#include <asm/bvme6000hw.h> +#endif + +#include <linux/generic_serial.h> +#include "scc.h" + + +#define CHANNEL_A 0 +#define CHANNEL_B 1 + +#define SCC_MINOR_BASE 64 + +/* Shadows for all SCC write registers */ +static unsigned char scc_shadow[2][16]; + +/* Location to access for SCC register access delay */ +static volatile unsigned char *scc_del = NULL; + +/* To keep track of STATUS_REG state for detection of Ext/Status int source */ +static unsigned char scc_last_status_reg[2]; + +/***************************** Prototypes *****************************/ + +/* Function prototypes */ +static void scc_disable_tx_interrupts(void * ptr); +static void scc_enable_tx_interrupts(void * ptr); +static void scc_disable_rx_interrupts(void * ptr); +static void scc_enable_rx_interrupts(void * ptr); +static int scc_get_CD(void * ptr); +static void scc_shutdown_port(void * ptr); +static int scc_set_real_termios(void *ptr); +static void scc_hungup(void *ptr); +static void scc_close(void *ptr); +static int scc_chars_in_buffer(void * ptr); +static int scc_open(struct tty_struct * tty, struct file * filp); +static int scc_ioctl(struct tty_struct * tty, struct file * filp, + unsigned int cmd, unsigned long arg); +static void scc_throttle(struct tty_struct *tty); +static void scc_unthrottle(struct tty_struct *tty); +static irqreturn_t scc_tx_int(int irq, void *data); +static irqreturn_t scc_rx_int(int irq, void *data); +static irqreturn_t scc_stat_int(int irq, void *data); +static irqreturn_t scc_spcond_int(int irq, void *data); +static void scc_setsignals(struct scc_port *port, int dtr, int rts); +static int scc_break_ctl(struct tty_struct *tty, int break_state); + +static struct tty_driver *scc_driver; + +static struct scc_port scc_ports[2]; + +/*--------------------------------------------------------------------------- + * Interface from generic_serial.c back here + *--------------------------------------------------------------------------*/ + +static struct real_driver scc_real_driver = { + scc_disable_tx_interrupts, + scc_enable_tx_interrupts, + scc_disable_rx_interrupts, + scc_enable_rx_interrupts, + scc_get_CD, + scc_shutdown_port, + scc_set_real_termios, + scc_chars_in_buffer, + scc_close, + scc_hungup, + NULL +}; + + +static const struct tty_operations scc_ops = { + .open = scc_open, + .close = gs_close, + .write = gs_write, + .put_char = gs_put_char, + .flush_chars = gs_flush_chars, + .write_room = gs_write_room, + .chars_in_buffer = gs_chars_in_buffer, + .flush_buffer = gs_flush_buffer, + .ioctl = scc_ioctl, + .throttle = scc_throttle, + .unthrottle = scc_unthrottle, + .set_termios = gs_set_termios, + .stop = gs_stop, + .start = gs_start, + .hangup = gs_hangup, + .break_ctl = scc_break_ctl, +}; + +/*---------------------------------------------------------------------------- + * vme_scc_init() and support functions + *---------------------------------------------------------------------------*/ + +static int scc_init_drivers(void) +{ + int error; + + scc_driver = alloc_tty_driver(2); + if (!scc_driver) + return -ENOMEM; + scc_driver->owner = THIS_MODULE; + scc_driver->driver_name = "scc"; + scc_driver->name = "ttyS"; + scc_driver->major = TTY_MAJOR; + scc_driver->minor_start = SCC_MINOR_BASE; + scc_driver->type = TTY_DRIVER_TYPE_SERIAL; + scc_driver->subtype = SERIAL_TYPE_NORMAL; + scc_driver->init_termios = tty_std_termios; + scc_driver->init_termios.c_cflag = + B9600 | CS8 | CREAD | HUPCL | CLOCAL; + scc_driver->init_termios.c_ispeed = 9600; + scc_driver->init_termios.c_ospeed = 9600; + scc_driver->flags = TTY_DRIVER_REAL_RAW; + tty_set_operations(scc_driver, &scc_ops); + + if ((error = tty_register_driver(scc_driver))) { + printk(KERN_ERR "scc: Couldn't register scc driver, error = %d\n", + error); + put_tty_driver(scc_driver); + return 1; + } + + return 0; +} + + +/* ports[] array is indexed by line no (i.e. [0] for ttyS0, [1] for ttyS1). + */ + +static void scc_init_portstructs(void) +{ + struct scc_port *port; + int i; + + for (i = 0; i < 2; i++) { + port = scc_ports + i; + port->gs.magic = SCC_MAGIC; + port->gs.close_delay = HZ/2; + port->gs.closing_wait = 30 * HZ; + port->gs.rd = &scc_real_driver; +#ifdef NEW_WRITE_LOCKING + port->gs.port_write_mutex = MUTEX; +#endif + init_waitqueue_head(&port->gs.port.open_wait); + init_waitqueue_head(&port->gs.port.close_wait); + } +} + + +#ifdef CONFIG_MVME147_SCC +static int mvme147_scc_init(void) +{ + struct scc_port *port; + + printk(KERN_INFO "SCC: MVME147 Serial Driver\n"); + /* Init channel A */ + port = &scc_ports[0]; + port->channel = CHANNEL_A; + port->ctrlp = (volatile unsigned char *)M147_SCC_A_ADDR; + port->datap = port->ctrlp + 1; + port->port_a = &scc_ports[0]; + port->port_b = &scc_ports[1]; + request_irq(MVME147_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED, + "SCC-A TX", port); + request_irq(MVME147_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED, + "SCC-A status", port); + request_irq(MVME147_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED, + "SCC-A RX", port); + request_irq(MVME147_IRQ_SCCA_SPCOND, scc_spcond_int, IRQF_DISABLED, + "SCC-A special cond", port); + { + SCC_ACCESS_INIT(port); + + /* disable interrupts for this channel */ + SCCwrite(INT_AND_DMA_REG, 0); + /* Set the interrupt vector */ + SCCwrite(INT_VECTOR_REG, MVME147_IRQ_SCC_BASE); + /* Interrupt parameters: vector includes status, status low */ + SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT); + SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB); + } + + /* Init channel B */ + port = &scc_ports[1]; + port->channel = CHANNEL_B; + port->ctrlp = (volatile unsigned char *)M147_SCC_B_ADDR; + port->datap = port->ctrlp + 1; + port->port_a = &scc_ports[0]; + port->port_b = &scc_ports[1]; + request_irq(MVME147_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED, + "SCC-B TX", port); + request_irq(MVME147_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED, + "SCC-B status", port); + request_irq(MVME147_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED, + "SCC-B RX", port); + request_irq(MVME147_IRQ_SCCB_SPCOND, scc_spcond_int, IRQF_DISABLED, + "SCC-B special cond", port); + { + SCC_ACCESS_INIT(port); + + /* disable interrupts for this channel */ + SCCwrite(INT_AND_DMA_REG, 0); + } + + /* Ensure interrupts are enabled in the PCC chip */ + m147_pcc->serial_cntrl=PCC_LEVEL_SERIAL|PCC_INT_ENAB; + + /* Initialise the tty driver structures and register */ + scc_init_portstructs(); + scc_init_drivers(); + + return 0; +} +#endif + + +#ifdef CONFIG_MVME162_SCC +static int mvme162_scc_init(void) +{ + struct scc_port *port; + + if (!(mvme16x_config & MVME16x_CONFIG_GOT_SCCA)) + return (-ENODEV); + + printk(KERN_INFO "SCC: MVME162 Serial Driver\n"); + /* Init channel A */ + port = &scc_ports[0]; + port->channel = CHANNEL_A; + port->ctrlp = (volatile unsigned char *)MVME_SCC_A_ADDR; + port->datap = port->ctrlp + 2; + port->port_a = &scc_ports[0]; + port->port_b = &scc_ports[1]; + request_irq(MVME162_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED, + "SCC-A TX", port); + request_irq(MVME162_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED, + "SCC-A status", port); + request_irq(MVME162_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED, + "SCC-A RX", port); + request_irq(MVME162_IRQ_SCCA_SPCOND, scc_spcond_int, IRQF_DISABLED, + "SCC-A special cond", port); + { + SCC_ACCESS_INIT(port); + + /* disable interrupts for this channel */ + SCCwrite(INT_AND_DMA_REG, 0); + /* Set the interrupt vector */ + SCCwrite(INT_VECTOR_REG, MVME162_IRQ_SCC_BASE); + /* Interrupt parameters: vector includes status, status low */ + SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT); + SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB); + } + + /* Init channel B */ + port = &scc_ports[1]; + port->channel = CHANNEL_B; + port->ctrlp = (volatile unsigned char *)MVME_SCC_B_ADDR; + port->datap = port->ctrlp + 2; + port->port_a = &scc_ports[0]; + port->port_b = &scc_ports[1]; + request_irq(MVME162_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED, + "SCC-B TX", port); + request_irq(MVME162_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED, + "SCC-B status", port); + request_irq(MVME162_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED, + "SCC-B RX", port); + request_irq(MVME162_IRQ_SCCB_SPCOND, scc_spcond_int, IRQF_DISABLED, + "SCC-B special cond", port); + + { + SCC_ACCESS_INIT(port); /* Either channel will do */ + + /* disable interrupts for this channel */ + SCCwrite(INT_AND_DMA_REG, 0); + } + + /* Ensure interrupts are enabled in the MC2 chip */ + *(volatile char *)0xfff4201d = 0x14; + + /* Initialise the tty driver structures and register */ + scc_init_portstructs(); + scc_init_drivers(); + + return 0; +} +#endif + + +#ifdef CONFIG_BVME6000_SCC +static int bvme6000_scc_init(void) +{ + struct scc_port *port; + + printk(KERN_INFO "SCC: BVME6000 Serial Driver\n"); + /* Init channel A */ + port = &scc_ports[0]; + port->channel = CHANNEL_A; + port->ctrlp = (volatile unsigned char *)BVME_SCC_A_ADDR; + port->datap = port->ctrlp + 4; + port->port_a = &scc_ports[0]; + port->port_b = &scc_ports[1]; + request_irq(BVME_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED, + "SCC-A TX", port); + request_irq(BVME_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED, + "SCC-A status", port); + request_irq(BVME_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED, + "SCC-A RX", port); + request_irq(BVME_IRQ_SCCA_SPCOND, scc_spcond_int, IRQF_DISABLED, + "SCC-A special cond", port); + { + SCC_ACCESS_INIT(port); + + /* disable interrupts for this channel */ + SCCwrite(INT_AND_DMA_REG, 0); + /* Set the interrupt vector */ + SCCwrite(INT_VECTOR_REG, BVME_IRQ_SCC_BASE); + /* Interrupt parameters: vector includes status, status low */ + SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT); + SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB); + } + + /* Init channel B */ + port = &scc_ports[1]; + port->channel = CHANNEL_B; + port->ctrlp = (volatile unsigned char *)BVME_SCC_B_ADDR; + port->datap = port->ctrlp + 4; + port->port_a = &scc_ports[0]; + port->port_b = &scc_ports[1]; + request_irq(BVME_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED, + "SCC-B TX", port); + request_irq(BVME_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED, + "SCC-B status", port); + request_irq(BVME_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED, + "SCC-B RX", port); + request_irq(BVME_IRQ_SCCB_SPCOND, scc_spcond_int, IRQF_DISABLED, + "SCC-B special cond", port); + + { + SCC_ACCESS_INIT(port); /* Either channel will do */ + + /* disable interrupts for this channel */ + SCCwrite(INT_AND_DMA_REG, 0); + } + + /* Initialise the tty driver structures and register */ + scc_init_portstructs(); + scc_init_drivers(); + + return 0; +} +#endif + + +static int vme_scc_init(void) +{ + int res = -ENODEV; + +#ifdef CONFIG_MVME147_SCC + if (MACH_IS_MVME147) + res = mvme147_scc_init(); +#endif +#ifdef CONFIG_MVME162_SCC + if (MACH_IS_MVME16x) + res = mvme162_scc_init(); +#endif +#ifdef CONFIG_BVME6000_SCC + if (MACH_IS_BVME6000) + res = bvme6000_scc_init(); +#endif + return res; +} + +module_init(vme_scc_init); + + +/*--------------------------------------------------------------------------- + * Interrupt handlers + *--------------------------------------------------------------------------*/ + +static irqreturn_t scc_rx_int(int irq, void *data) +{ + unsigned char ch; + struct scc_port *port = data; + struct tty_struct *tty = port->gs.port.tty; + SCC_ACCESS_INIT(port); + + ch = SCCread_NB(RX_DATA_REG); + if (!tty) { + printk(KERN_WARNING "scc_rx_int with NULL tty!\n"); + SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); + return IRQ_HANDLED; + } + tty_insert_flip_char(tty, ch, 0); + + /* Check if another character is already ready; in that case, the + * spcond_int() function must be used, because this character may have an + * error condition that isn't signalled by the interrupt vector used! + */ + if (SCCread(INT_PENDING_REG) & + (port->channel == CHANNEL_A ? IPR_A_RX : IPR_B_RX)) { + scc_spcond_int (irq, data); + return IRQ_HANDLED; + } + + SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); + + tty_flip_buffer_push(tty); + return IRQ_HANDLED; +} + + +static irqreturn_t scc_spcond_int(int irq, void *data) +{ + struct scc_port *port = data; + struct tty_struct *tty = port->gs.port.tty; + unsigned char stat, ch, err; + int int_pending_mask = port->channel == CHANNEL_A ? + IPR_A_RX : IPR_B_RX; + SCC_ACCESS_INIT(port); + + if (!tty) { + printk(KERN_WARNING "scc_spcond_int with NULL tty!\n"); + SCCwrite(COMMAND_REG, CR_ERROR_RESET); + SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); + return IRQ_HANDLED; + } + do { + stat = SCCread(SPCOND_STATUS_REG); + ch = SCCread_NB(RX_DATA_REG); + + if (stat & SCSR_RX_OVERRUN) + err = TTY_OVERRUN; + else if (stat & SCSR_PARITY_ERR) + err = TTY_PARITY; + else if (stat & SCSR_CRC_FRAME_ERR) + err = TTY_FRAME; + else + err = 0; + + tty_insert_flip_char(tty, ch, err); + + /* ++TeSche: *All* errors have to be cleared manually, + * else the condition persists for the next chars + */ + if (err) + SCCwrite(COMMAND_REG, CR_ERROR_RESET); + + } while(SCCread(INT_PENDING_REG) & int_pending_mask); + + SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); + + tty_flip_buffer_push(tty); + return IRQ_HANDLED; +} + + +static irqreturn_t scc_tx_int(int irq, void *data) +{ + struct scc_port *port = data; + SCC_ACCESS_INIT(port); + + if (!port->gs.port.tty) { + printk(KERN_WARNING "scc_tx_int with NULL tty!\n"); + SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0); + SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET); + SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); + return IRQ_HANDLED; + } + while ((SCCread_NB(STATUS_REG) & SR_TX_BUF_EMPTY)) { + if (port->x_char) { + SCCwrite(TX_DATA_REG, port->x_char); + port->x_char = 0; + } + else if ((port->gs.xmit_cnt <= 0) || + port->gs.port.tty->stopped || + port->gs.port.tty->hw_stopped) + break; + else { + SCCwrite(TX_DATA_REG, port->gs.xmit_buf[port->gs.xmit_tail++]); + port->gs.xmit_tail = port->gs.xmit_tail & (SERIAL_XMIT_SIZE-1); + if (--port->gs.xmit_cnt <= 0) + break; + } + } + if ((port->gs.xmit_cnt <= 0) || port->gs.port.tty->stopped || + port->gs.port.tty->hw_stopped) { + /* disable tx interrupts */ + SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0); + SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET); /* disable tx_int on next tx underrun? */ + port->gs.port.flags &= ~GS_TX_INTEN; + } + if (port->gs.port.tty && port->gs.xmit_cnt <= port->gs.wakeup_chars) + tty_wakeup(port->gs.port.tty); + + SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); + return IRQ_HANDLED; +} + + +static irqreturn_t scc_stat_int(int irq, void *data) +{ + struct scc_port *port = data; + unsigned channel = port->channel; + unsigned char last_sr, sr, changed; + SCC_ACCESS_INIT(port); + + last_sr = scc_last_status_reg[channel]; + sr = scc_last_status_reg[channel] = SCCread_NB(STATUS_REG); + changed = last_sr ^ sr; + + if (changed & SR_DCD) { + port->c_dcd = !!(sr & SR_DCD); + if (!(port->gs.port.flags & ASYNC_CHECK_CD)) + ; /* Don't report DCD changes */ + else if (port->c_dcd) { + wake_up_interruptible(&port->gs.port.open_wait); + } + else { + if (port->gs.port.tty) + tty_hangup (port->gs.port.tty); + } + } + SCCwrite(COMMAND_REG, CR_EXTSTAT_RESET); + SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); + return IRQ_HANDLED; +} + + +/*--------------------------------------------------------------------------- + * generic_serial.c callback funtions + *--------------------------------------------------------------------------*/ + +static void scc_disable_tx_interrupts(void *ptr) +{ + struct scc_port *port = ptr; + unsigned long flags; + SCC_ACCESS_INIT(port); + + local_irq_save(flags); + SCCmod(INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0); + port->gs.port.flags &= ~GS_TX_INTEN; + local_irq_restore(flags); +} + + +static void scc_enable_tx_interrupts(void *ptr) +{ + struct scc_port *port = ptr; + unsigned long flags; + SCC_ACCESS_INIT(port); + + local_irq_save(flags); + SCCmod(INT_AND_DMA_REG, 0xff, IDR_TX_INT_ENAB); + /* restart the transmitter */ + scc_tx_int (0, port); + local_irq_restore(flags); +} + + +static void scc_disable_rx_interrupts(void *ptr) +{ + struct scc_port *port = ptr; + unsigned long flags; + SCC_ACCESS_INIT(port); + + local_irq_save(flags); + SCCmod(INT_AND_DMA_REG, + ~(IDR_RX_INT_MASK|IDR_PARERR_AS_SPCOND|IDR_EXTSTAT_INT_ENAB), 0); + local_irq_restore(flags); +} + + +static void scc_enable_rx_interrupts(void *ptr) +{ + struct scc_port *port = ptr; + unsigned long flags; + SCC_ACCESS_INIT(port); + + local_irq_save(flags); + SCCmod(INT_AND_DMA_REG, 0xff, + IDR_EXTSTAT_INT_ENAB|IDR_PARERR_AS_SPCOND|IDR_RX_INT_ALL); + local_irq_restore(flags); +} + + +static int scc_get_CD(void *ptr) +{ + struct scc_port *port = ptr; + unsigned channel = port->channel; + + return !!(scc_last_status_reg[channel] & SR_DCD); +} + + +static void scc_shutdown_port(void *ptr) +{ + struct scc_port *port = ptr; + + port->gs.port.flags &= ~ GS_ACTIVE; + if (port->gs.port.tty && port->gs.port.tty->termios->c_cflag & HUPCL) { + scc_setsignals (port, 0, 0); + } +} + + +static int scc_set_real_termios (void *ptr) +{ + /* the SCC has char sizes 5,7,6,8 in that order! */ + static int chsize_map[4] = { 0, 2, 1, 3 }; + unsigned cflag, baud, chsize, channel, brgval = 0; + unsigned long flags; + struct scc_port *port = ptr; + SCC_ACCESS_INIT(port); + + if (!port->gs.port.tty || !port->gs.port.tty->termios) return 0; + + channel = port->channel; + + if (channel == CHANNEL_A) + return 0; /* Settings controlled by boot PROM */ + + cflag = port->gs.port.tty->termios->c_cflag; + baud = port->gs.baud; + chsize = (cflag & CSIZE) >> 4; + + if (baud == 0) { + /* speed == 0 -> drop DTR */ + local_irq_save(flags); + SCCmod(TX_CTRL_REG, ~TCR_DTR, 0); + local_irq_restore(flags); + return 0; + } + else if ((MACH_IS_MVME16x && (baud < 50 || baud > 38400)) || + (MACH_IS_MVME147 && (baud < 50 || baud > 19200)) || + (MACH_IS_BVME6000 &&(baud < 50 || baud > 76800))) { + printk(KERN_NOTICE "SCC: Bad speed requested, %d\n", baud); + return 0; + } + + if (cflag & CLOCAL) + port->gs.port.flags &= ~ASYNC_CHECK_CD; + else + port->gs.port.flags |= ASYNC_CHECK_CD; + +#ifdef CONFIG_MVME147_SCC + if (MACH_IS_MVME147) + brgval = (M147_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2; +#endif +#ifdef CONFIG_MVME162_SCC + if (MACH_IS_MVME16x) + brgval = (MVME_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2; +#endif +#ifdef CONFIG_BVME6000_SCC + if (MACH_IS_BVME6000) + brgval = (BVME_SCC_RTxC + baud/2) / (16 * 2 * baud) - 2; +#endif + /* Now we have all parameters and can go to set them: */ + local_irq_save(flags); + + /* receiver's character size and auto-enables */ + SCCmod(RX_CTRL_REG, ~(RCR_CHSIZE_MASK|RCR_AUTO_ENAB_MODE), + (chsize_map[chsize] << 6) | + ((cflag & CRTSCTS) ? RCR_AUTO_ENAB_MODE : 0)); + /* parity and stop bits (both, Tx and Rx), clock mode never changes */ + SCCmod (AUX1_CTRL_REG, + ~(A1CR_PARITY_MASK | A1CR_MODE_MASK), + ((cflag & PARENB + ? (cflag & PARODD ? A1CR_PARITY_ODD : A1CR_PARITY_EVEN) + : A1CR_PARITY_NONE) + | (cflag & CSTOPB ? A1CR_MODE_ASYNC_2 : A1CR_MODE_ASYNC_1))); + /* sender's character size, set DTR for valid baud rate */ + SCCmod(TX_CTRL_REG, ~TCR_CHSIZE_MASK, chsize_map[chsize] << 5 | TCR_DTR); + /* clock sources never change */ + /* disable BRG before changing the value */ + SCCmod(DPLL_CTRL_REG, ~DCR_BRG_ENAB, 0); + /* BRG value */ + SCCwrite(TIMER_LOW_REG, brgval & 0xff); + SCCwrite(TIMER_HIGH_REG, (brgval >> 8) & 0xff); + /* BRG enable, and clock source never changes */ + SCCmod(DPLL_CTRL_REG, 0xff, DCR_BRG_ENAB); + + local_irq_restore(flags); + + return 0; +} + + +static int scc_chars_in_buffer (void *ptr) +{ + struct scc_port *port = ptr; + SCC_ACCESS_INIT(port); + + return (SCCread (SPCOND_STATUS_REG) & SCSR_ALL_SENT) ? 0 : 1; +} + + +/* Comment taken from sx.c (2.4.0): + I haven't the foggiest why the decrement use count has to happen + here. The whole linux serial drivers stuff needs to be redesigned. + My guess is that this is a hack to minimize the impact of a bug + elsewhere. Thinking about it some more. (try it sometime) Try + running minicom on a serial port that is driven by a modularized + driver. Have the modem hangup. Then remove the driver module. Then + exit minicom. I expect an "oops". -- REW */ + +static void scc_hungup(void *ptr) +{ + scc_disable_tx_interrupts(ptr); + scc_disable_rx_interrupts(ptr); +} + + +static void scc_close(void *ptr) +{ + scc_disable_tx_interrupts(ptr); + scc_disable_rx_interrupts(ptr); +} + + +/*--------------------------------------------------------------------------- + * Internal support functions + *--------------------------------------------------------------------------*/ + +static void scc_setsignals(struct scc_port *port, int dtr, int rts) +{ + unsigned long flags; + unsigned char t; + SCC_ACCESS_INIT(port); + + local_irq_save(flags); + t = SCCread(TX_CTRL_REG); + if (dtr >= 0) t = dtr? (t | TCR_DTR): (t & ~TCR_DTR); + if (rts >= 0) t = rts? (t | TCR_RTS): (t & ~TCR_RTS); + SCCwrite(TX_CTRL_REG, t); + local_irq_restore(flags); +} + + +static void scc_send_xchar(struct tty_struct *tty, char ch) +{ + struct scc_port *port = (struct scc_port *)tty->driver_data; + + port->x_char = ch; + if (ch) + scc_enable_tx_interrupts(port); +} + + +/*--------------------------------------------------------------------------- + * Driver entrypoints referenced from above + *--------------------------------------------------------------------------*/ + +static int scc_open (struct tty_struct * tty, struct file * filp) +{ + int line = tty->index; + int retval; + struct scc_port *port = &scc_ports[line]; + int i, channel = port->channel; + unsigned long flags; + SCC_ACCESS_INIT(port); +#if defined(CONFIG_MVME162_SCC) || defined(CONFIG_MVME147_SCC) + static const struct { + unsigned reg, val; + } mvme_init_tab[] = { + /* Values for MVME162 and MVME147 */ + /* no parity, 1 stop bit, async, 1:16 */ + { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 }, + /* parity error is special cond, ints disabled, no DMA */ + { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB }, + /* Rx 8 bits/char, no auto enable, Rx off */ + { RX_CTRL_REG, RCR_CHSIZE_8 }, + /* DTR off, Tx 8 bits/char, RTS off, Tx off */ + { TX_CTRL_REG, TCR_CHSIZE_8 }, + /* special features off */ + { AUX2_CTRL_REG, 0 }, + { CLK_CTRL_REG, CCR_RXCLK_BRG | CCR_TXCLK_BRG }, + { DPLL_CTRL_REG, DCR_BRG_ENAB | DCR_BRG_USE_PCLK }, + /* Start Rx */ + { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 }, + /* Start Tx */ + { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 }, + /* Ext/Stat ints: DCD only */ + { INT_CTRL_REG, ICR_ENAB_DCD_INT }, + /* Reset Ext/Stat ints */ + { COMMAND_REG, CR_EXTSTAT_RESET }, + /* ...again */ + { COMMAND_REG, CR_EXTSTAT_RESET }, + }; +#endif +#if defined(CONFIG_BVME6000_SCC) + static const struct { + unsigned reg, val; + } bvme_init_tab[] = { + /* Values for BVME6000 */ + /* no parity, 1 stop bit, async, 1:16 */ + { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 }, + /* parity error is special cond, ints disabled, no DMA */ + { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB }, + /* Rx 8 bits/char, no auto enable, Rx off */ + { RX_CTRL_REG, RCR_CHSIZE_8 }, + /* DTR off, Tx 8 bits/char, RTS off, Tx off */ + { TX_CTRL_REG, TCR_CHSIZE_8 }, + /* special features off */ + { AUX2_CTRL_REG, 0 }, + { CLK_CTRL_REG, CCR_RTxC_XTAL | CCR_RXCLK_BRG | CCR_TXCLK_BRG }, + { DPLL_CTRL_REG, DCR_BRG_ENAB }, + /* Start Rx */ + { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 }, + /* Start Tx */ + { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 }, + /* Ext/Stat ints: DCD only */ + { INT_CTRL_REG, ICR_ENAB_DCD_INT }, + /* Reset Ext/Stat ints */ + { COMMAND_REG, CR_EXTSTAT_RESET }, + /* ...again */ + { COMMAND_REG, CR_EXTSTAT_RESET }, + }; +#endif + if (!(port->gs.port.flags & ASYNC_INITIALIZED)) { + local_irq_save(flags); +#if defined(CONFIG_MVME147_SCC) || defined(CONFIG_MVME162_SCC) + if (MACH_IS_MVME147 || MACH_IS_MVME16x) { + for (i = 0; i < ARRAY_SIZE(mvme_init_tab); ++i) + SCCwrite(mvme_init_tab[i].reg, mvme_init_tab[i].val); + } +#endif +#if defined(CONFIG_BVME6000_SCC) + if (MACH_IS_BVME6000) { + for (i = 0; i < ARRAY_SIZE(bvme_init_tab); ++i) + SCCwrite(bvme_init_tab[i].reg, bvme_init_tab[i].val); + } +#endif + + /* remember status register for detection of DCD and CTS changes */ + scc_last_status_reg[channel] = SCCread(STATUS_REG); + + port->c_dcd = 0; /* Prevent initial 1->0 interrupt */ + scc_setsignals (port, 1,1); + local_irq_restore(flags); + } + + tty->driver_data = port; + port->gs.port.tty = tty; + port->gs.port.count++; + retval = gs_init_port(&port->gs); + if (retval) { + port->gs.port.count--; + return retval; + } + port->gs.port.flags |= GS_ACTIVE; + retval = gs_block_til_ready(port, filp); + + if (retval) { + port->gs.port.count--; + return retval; + } + + port->c_dcd = scc_get_CD (port); + + scc_enable_rx_interrupts(port); + + return 0; +} + + +static void scc_throttle (struct tty_struct * tty) +{ + struct scc_port *port = (struct scc_port *)tty->driver_data; + unsigned long flags; + SCC_ACCESS_INIT(port); + + if (tty->termios->c_cflag & CRTSCTS) { + local_irq_save(flags); + SCCmod(TX_CTRL_REG, ~TCR_RTS, 0); + local_irq_restore(flags); + } + if (I_IXOFF(tty)) + scc_send_xchar(tty, STOP_CHAR(tty)); +} + + +static void scc_unthrottle (struct tty_struct * tty) +{ + struct scc_port *port = (struct scc_port *)tty->driver_data; + unsigned long flags; + SCC_ACCESS_INIT(port); + + if (tty->termios->c_cflag & CRTSCTS) { + local_irq_save(flags); + SCCmod(TX_CTRL_REG, 0xff, TCR_RTS); + local_irq_restore(flags); + } + if (I_IXOFF(tty)) + scc_send_xchar(tty, START_CHAR(tty)); +} + + +static int scc_ioctl(struct tty_struct *tty, struct file *file, + unsigned int cmd, unsigned long arg) +{ + return -ENOIOCTLCMD; +} + + +static int scc_break_ctl(struct tty_struct *tty, int break_state) +{ + struct scc_port *port = (struct scc_port *)tty->driver_data; + unsigned long flags; + SCC_ACCESS_INIT(port); + + local_irq_save(flags); + SCCmod(TX_CTRL_REG, ~TCR_SEND_BREAK, + break_state ? TCR_SEND_BREAK : 0); + local_irq_restore(flags); + return 0; +} + + +/*--------------------------------------------------------------------------- + * Serial console stuff... + *--------------------------------------------------------------------------*/ + +#define scc_delay() do { __asm__ __volatile__ (" nop; nop"); } while (0) + +static void scc_ch_write (char ch) +{ + volatile char *p = NULL; + +#ifdef CONFIG_MVME147_SCC + if (MACH_IS_MVME147) + p = (volatile char *)M147_SCC_A_ADDR; +#endif +#ifdef CONFIG_MVME162_SCC + if (MACH_IS_MVME16x) + p = (volatile char *)MVME_SCC_A_ADDR; +#endif +#ifdef CONFIG_BVME6000_SCC + if (MACH_IS_BVME6000) + p = (volatile char *)BVME_SCC_A_ADDR; +#endif + + do { + scc_delay(); + } + while (!(*p & 4)); + scc_delay(); + *p = 8; + scc_delay(); + *p = ch; +} + +/* The console must be locked when we get here. */ + +static void scc_console_write (struct console *co, const char *str, unsigned count) +{ + unsigned long flags; + + local_irq_save(flags); + + while (count--) + { + if (*str == '\n') + scc_ch_write ('\r'); + scc_ch_write (*str++); + } + local_irq_restore(flags); +} + +static struct tty_driver *scc_console_device(struct console *c, int *index) +{ + *index = c->index; + return scc_driver; +} + +static struct console sercons = { + .name = "ttyS", + .write = scc_console_write, + .device = scc_console_device, + .flags = CON_PRINTBUFFER, + .index = -1, +}; + + +static int __init vme_scc_console_init(void) +{ + if (vme_brdtype == VME_TYPE_MVME147 || + vme_brdtype == VME_TYPE_MVME162 || + vme_brdtype == VME_TYPE_MVME172 || + vme_brdtype == VME_TYPE_BVME4000 || + vme_brdtype == VME_TYPE_BVME6000) + register_console(&sercons); + return 0; +} +console_initcall(vme_scc_console_init); |
