summaryrefslogtreecommitdiffstats
path: root/drivers/serial/mux.c
diff options
context:
space:
mode:
authorRyan Bradetich <rbrad@j6000.bradetich.net>2006-11-03 06:34:16 +0000
committerKyle McMartin <kyle@ubuntu.com>2006-12-08 00:34:14 -0500
commit9c6416ce6a9829ede1594403d19b22d23cf54e2e (patch)
tree19c0002be37dcf21f9d75f694eef137481137d90 /drivers/serial/mux.c
parent3de7b6482b4e9a34f91604ee0fb7a3ace250f3bb (diff)
downloadop-kernel-dev-9c6416ce6a9829ede1594403d19b22d23cf54e2e.zip
op-kernel-dev-9c6416ce6a9829ede1594403d19b22d23cf54e2e.tar.gz
[PARISC] [MUX] Claim resources for the Mux driver
This patch claims the iomem resources for the Mux driver. Signed-off-by: Ryan Bradetich <rbrad@parisc-linux.org> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
Diffstat (limited to 'drivers/serial/mux.c')
-rw-r--r--drivers/serial/mux.c61
1 files changed, 60 insertions, 1 deletions
diff --git a/drivers/serial/mux.c b/drivers/serial/mux.c
index 6408b9b..f21faf1 100644
--- a/drivers/serial/mux.c
+++ b/drivers/serial/mux.c
@@ -66,6 +66,13 @@ static struct uart_driver mux_driver = {
.nr = MUX_NR,
};
+struct mux_card {
+ int port_count;
+ struct parisc_device *dev;
+ struct mux_card *next;
+};
+
+static struct mux_card *mux_card_head;
static struct timer_list mux_timer;
#define UART_PUT_CHAR(p, c) __raw_writel((c), (p)->membase + IO_DATA_REG_OFFSET)
@@ -434,6 +441,37 @@ static struct uart_ops mux_pops = {
};
/**
+ * get_new_mux_card - Allocate and return a new mux card.
+ *
+ * This function is used to allocate and return a new mux card.
+ */
+static struct mux_card * __init get_new_mux_card(void)
+{
+ struct mux_card *card = mux_card_head;
+
+ if(card == NULL) {
+ mux_card_head = kzalloc(sizeof(struct mux_card), GFP_KERNEL);
+ if(!mux_card_head) {
+ printk(KERN_ERR "MUX: Unable to allocate memory.\n");
+ return NULL;
+ }
+ return mux_card_head;
+ }
+
+ while(card->next) {
+ card = card->next;
+ }
+
+ card->next = kzalloc(sizeof(struct mux_card), GFP_KERNEL);
+ if(!card->next) {
+ printk(KERN_ERR "MUX: Unable to allocate memory.\n");
+ return NULL;
+ }
+
+ return card->next;
+}
+
+/**
* mux_probe - Determine if the Serial Mux should claim this device.
* @dev: The parisc device.
*
@@ -446,6 +484,7 @@ static int __init mux_probe(struct parisc_device *dev)
u8 iodc_data[32];
unsigned long bytecnt;
struct uart_port *port;
+ struct mux_card *card;
status = pdc_iodc_read(&bytecnt, dev->hpa.start, 0, iodc_data, 32);
if(status != PDC_OK) {
@@ -454,7 +493,16 @@ static int __init mux_probe(struct parisc_device *dev)
}
ports = GET_MUX_PORTS(iodc_data);
- printk(KERN_INFO "Serial mux driver (%d ports) Revision: 0.3\n", ports);
+ printk(KERN_INFO "Serial mux driver (%d ports) Revision: 0.4\n", ports);
+
+ card = get_new_mux_card();
+ if(card == NULL)
+ return 1;
+
+ card->dev = dev;
+ card->port_count = ports;
+ request_mem_region(card->dev->hpa.start + MUX_OFFSET,
+ card->port_count * MUX_LINE_OFFSET, "Mux");
if(!port_cnt) {
mux_driver.cons = MUX_CONSOLE;
@@ -534,6 +582,8 @@ static int __init mux_init(void)
static void __exit mux_exit(void)
{
int i;
+ struct mux_card *next;
+ struct mux_card *card = mux_card_head;
for (i = 0; i < port_cnt; i++) {
uart_remove_one_port(&mux_driver, &mux_ports[i].port);
@@ -541,6 +591,15 @@ static void __exit mux_exit(void)
iounmap(mux_ports[i].port.membase);
}
+ while(card != NULL) {
+ release_mem_region(card->dev->hpa.start + MUX_OFFSET,
+ card->port_count * MUX_LINE_OFFSET);
+
+ next = card->next;
+ kfree(card);
+ card = next;
+ }
+
uart_unregister_driver(&mux_driver);
}
OpenPOWER on IntegriCloud