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Commit 9c6416ce authored by Ryan Bradetich's avatar Ryan Bradetich Committed by Kyle McMartin
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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: default avatarRyan Bradetich <rbrad@parisc-linux.org>
Signed-off-by: default avatarKyle McMartin <kyle@parisc-linux.org>
parent 3de7b648

drivers/serial/mux.c

+60 −1
Original line number Diff line number Diff line
@@ -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);

}