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authorRyan Bradetich <rbradetich@gmail.com>2006-11-05 01:21:44 +0000
committerKyle McMartin <kyle@ubuntu.com>2006-12-08 00:34:21 -0500
commitc380f057269686e17db74d360c923663889ac702 (patch)
treef9f063b72dbabc17777d11099a166f292b5be071 /drivers/serial/mux.c
parent9c6416ce6a9829ede1594403d19b22d23cf54e2e (diff)
[PARISC] [MUX] Make the Serial Mux driver work as module
The following updates are based off a patch from willy: * Removal of the mux_card list. * Add the mux_remove function. Other updates: * Re-organize the driver structure a bit to make the mux_init and mux_exit functions more symmetrical. * Added the del_timer. * Unregistered the console. At this point I can insmod, rmmod, and re-insmod the mux without any failures. 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.c135
1 files changed, 57 insertions, 78 deletions
diff --git a/drivers/serial/mux.c b/drivers/serial/mux.c
index f21faf16395..5ff7e05a152 100644
--- a/drivers/serial/mux.c
+++ b/drivers/serial/mux.c
@@ -66,13 +66,6 @@ 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)
@@ -441,37 +434,6 @@ 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.
*
@@ -480,11 +442,9 @@ static struct mux_card * __init get_new_mux_card(void)
*/
static int __init mux_probe(struct parisc_device *dev)
{
- int i, status, ports;
+ int i, status, port_count;
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) {
@@ -492,17 +452,12 @@ static int __init mux_probe(struct parisc_device *dev)
return 1;
}
- ports = GET_MUX_PORTS(iodc_data);
- printk(KERN_INFO "Serial mux driver (%d ports) Revision: 0.4\n", ports);
+ port_count = GET_MUX_PORTS(iodc_data);
+ printk(KERN_INFO "Serial mux driver (%d ports) Revision: 0.5\n", port_count);
- 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");
+ dev_set_drvdata(&dev->dev, (void *)(long)port_count);
+ request_mem_region(dev->hpa.start + MUX_OFFSET,
+ port_count * MUX_LINE_OFFSET, "Mux");
if(!port_cnt) {
mux_driver.cons = MUX_CONSOLE;
@@ -512,13 +467,10 @@ static int __init mux_probe(struct parisc_device *dev)
printk(KERN_ERR "Serial mux: Unable to register driver.\n");
return 1;
}
-
- init_timer(&mux_timer);
- mux_timer.function = mux_poll;
}
- for(i = 0; i < ports; ++i, ++port_cnt) {
- port = &mux_ports[port_cnt].port;
+ for(i = 0; i < port_count; ++i, ++port_cnt) {
+ struct uart_port *port = &mux_ports[port_cnt].port;
port->iobase = 0;
port->mapbase = dev->hpa.start + MUX_OFFSET +
(i * MUX_LINE_OFFSET);
@@ -543,11 +495,34 @@ static int __init mux_probe(struct parisc_device *dev)
BUG_ON(status);
}
-#ifdef CONFIG_SERIAL_MUX_CONSOLE
- register_console(&mux_console);
-#endif
- mod_timer(&mux_timer, jiffies + MUX_POLL_DELAY);
+ return 0;
+}
+static int __devexit mux_remove(struct parisc_device *dev)
+{
+ int i;
+ int port_count = (long)dev_get_drvdata(&dev->dev);
+
+ /* Delete the Mux timer. */
+ del_timer(&mux_timer);
+
+ /* Find Port 0 for this card in the mux_ports list. */
+ for(i = 0; i < port_cnt; ++i) {
+ if(mux_ports[i].port.mapbase == dev->hpa.start + MUX_OFFSET)
+ break;
+ }
+ BUG_ON(i + port_count > port_cnt);
+
+ /* Release the resources associated with each port on the device. */
+ for(; i < port_count; ++i) {
+ struct uart_port *port = &mux_ports[i].port;
+
+ uart_remove_one_port(&mux_driver, port);
+ if(port->membase)
+ iounmap(port->membase);
+ }
+
+ release_mem_region(dev->hpa.start + MUX_OFFSET, port_count * MUX_LINE_OFFSET);
return 0;
}
@@ -562,6 +537,7 @@ static struct parisc_driver serial_mux_driver = {
.name = "serial_mux",
.id_table = mux_tbl,
.probe = mux_probe,
+ .remove = __devexit_p(mux_remove),
};
/**
@@ -571,7 +547,20 @@ static struct parisc_driver serial_mux_driver = {
*/
static int __init mux_init(void)
{
- return register_parisc_driver(&serial_mux_driver);
+ int status = register_parisc_driver(&serial_mux_driver);
+
+ if(port_cnt > 0) {
+ /* Start the Mux timer */
+ init_timer(&mux_timer);
+ mux_timer.function = mux_poll;
+ mod_timer(&mux_timer, jiffies + MUX_POLL_DELAY);
+
+#ifdef CONFIG_SERIAL_MUX_CONSOLE
+ register_console(&mux_console);
+#endif
+ }
+
+ return status;
}
/**
@@ -581,25 +570,15 @@ 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);
- if (mux_ports[i].port.membase)
- 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;
+ /* Delete the Mux timer. */
+ if(port_cnt > 0) {
+ del_timer(&mux_timer);
+#ifdef CONFIG_SERIAL_MUX_CONSOLE
+ unregister_console(&mux_console);
+#endif
}
+ unregister_parisc_driver(&serial_mux_driver);
uart_unregister_driver(&mux_driver);
}