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[PARISC] [MUX] Make the Serial Mux driver work as module

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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>
This commit is contained in:
Ryan Bradetich 2006-11-05 01:21:44 +00:00 committed by Kyle McMartin
parent 9c6416ce6a
commit c380f05726
1 changed files with 57 additions and 78 deletions
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135
drivers/serial/mux.c
View file

@ -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)
@ -440,37 +433,6 @@ static struct uart_ops mux_pops = {
.verify_port = mux_verify_port,
};
/**
* 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);
}