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[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>
This commit is contained in:
Ryan Bradetich 2006-11-03 06:34:16 +00:00 committed by Kyle McMartin
parent 3de7b6482b
commit 9c6416ce6a
1 changed files with 60 additions and 1 deletions
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61
drivers/serial/mux.c
View File

@ -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)
@ -433,6 +440,37 @@ 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.
@ -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);
}