[mirror_ubuntu-zesty-kernel.git] / drivers / watchdog / pnx4008_wdt.c

/*
 * drivers/char/watchdog/pnx4008_wdt.c
 *
 * Watchdog driver for PNX4008 board
 *
 * Authors: Dmitry Chigirev <source@mvista.com>,
 * 	    Vitaly Wool <vitalywool@gmail.com>
 * Based on sa1100 driver,
 * Copyright (C) 2000 Oleg Drokin <green@crimea.edu>
 *
 * 2005-2006 (c) MontaVista Software, Inc. This file is licensed under
 * the terms of the GNU General Public License version 2. This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/ioport.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include <linux/io.h>

#include <asm/hardware.h>

#define MODULE_NAME "PNX4008-WDT: "

/* WatchDog Timer - Chapter 23 Page 207 */

#define DEFAULT_HEARTBEAT 19
#define MAX_HEARTBEAT     60

/* Watchdog timer register set definition */
#define WDTIM_INT(p)     ((p) + 0x0)
#define WDTIM_CTRL(p)    ((p) + 0x4)
#define WDTIM_COUNTER(p) ((p) + 0x8)
#define WDTIM_MCTRL(p)   ((p) + 0xC)
#define WDTIM_MATCH0(p)  ((p) + 0x10)
#define WDTIM_EMR(p)     ((p) + 0x14)
#define WDTIM_PULSE(p)   ((p) + 0x18)
#define WDTIM_RES(p)     ((p) + 0x1C)

/* WDTIM_INT bit definitions */
#define MATCH_INT      1

/* WDTIM_CTRL bit definitions */
#define COUNT_ENAB     1
#define RESET_COUNT    (1<<1)
#define DEBUG_EN       (1<<2)

/* WDTIM_MCTRL bit definitions */
#define MR0_INT        1
#undef  RESET_COUNT0
#define RESET_COUNT0   (1<<2)
#define STOP_COUNT0    (1<<2)
#define M_RES1         (1<<3)
#define M_RES2         (1<<4)
#define RESFRC1        (1<<5)
#define RESFRC2        (1<<6)

/* WDTIM_EMR bit definitions */
#define EXT_MATCH0      1
#define MATCH_OUTPUT_HIGH (2<<4)	/*a MATCH_CTRL setting */

/* WDTIM_RES bit definitions */
#define WDOG_RESET      1	/* read only */

#define WDOG_COUNTER_RATE 13000000	/*the counter clock is 13 MHz fixed */

static int nowayout = WATCHDOG_NOWAYOUT;
static int heartbeat = DEFAULT_HEARTBEAT;

static DEFINE_SPINLOCK(io_lock);
static unsigned long wdt_status;
#define WDT_IN_USE        0
#define WDT_OK_TO_CLOSE   1
#define WDT_REGION_INITED 2
#define WDT_DEVICE_INITED 3

static unsigned long boot_status;

static struct resource	*wdt_mem;
static void __iomem	*wdt_base;
struct clk		*wdt_clk;

static void wdt_enable(void)
{
	spin_lock(&io_lock);

	if (wdt_clk)
		clk_set_rate(wdt_clk, 1);

	/* stop counter, initiate counter reset */
	__raw_writel(RESET_COUNT, WDTIM_CTRL(wdt_base));
	/*wait for reset to complete. 100% guarantee event */
	while (__raw_readl(WDTIM_COUNTER(wdt_base)))
		cpu_relax();
	/* internal and external reset, stop after that */
	__raw_writel(M_RES2 | STOP_COUNT0 | RESET_COUNT0,
		WDTIM_MCTRL(wdt_base));
	/* configure match output */
	__raw_writel(MATCH_OUTPUT_HIGH, WDTIM_EMR(wdt_base));
	/* clear interrupt, just in case */
	__raw_writel(MATCH_INT, WDTIM_INT(wdt_base));
	/* the longest pulse period 65541/(13*10^6) seconds ~ 5 ms. */
	__raw_writel(0xFFFF, WDTIM_PULSE(wdt_base));
	__raw_writel(heartbeat * WDOG_COUNTER_RATE, WDTIM_MATCH0(wdt_base));
	/*enable counter, stop when debugger active */
	__raw_writel(COUNT_ENAB | DEBUG_EN, WDTIM_CTRL(wdt_base));

	spin_unlock(&io_lock);
}

static void wdt_disable(void)
{
	spin_lock(&io_lock);

	__raw_writel(0, WDTIM_CTRL(wdt_base));	/*stop counter */
	if (wdt_clk)
		clk_set_rate(wdt_clk, 0);

	spin_unlock(&io_lock);
}

static int pnx4008_wdt_open(struct inode *inode, struct file *file)
{
	if (test_and_set_bit(WDT_IN_USE, &wdt_status))
		return -EBUSY;

	clear_bit(WDT_OK_TO_CLOSE, &wdt_status);

	wdt_enable();

	return nonseekable_open(inode, file);
}

static ssize_t pnx4008_wdt_write(struct file *file, const char *data,
					size_t len, loff_t *ppos)
{
	if (len) {
		if (!nowayout) {
			size_t i;

			clear_bit(WDT_OK_TO_CLOSE, &wdt_status);

			for (i = 0; i != len; i++) {
				char c;

				if (get_user(c, data + i))
					return -EFAULT;
				if (c == 'V')
					set_bit(WDT_OK_TO_CLOSE, &wdt_status);
			}
		}
		wdt_enable();
	}

	return len;
}

static const struct watchdog_info ident = {
	.options = WDIOF_CARDRESET | WDIOF_MAGICCLOSE |
	    WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
	.identity = "PNX4008 Watchdog",
};

static long pnx4008_wdt_ioctl(struct inode *inode, struct file *file,
					unsigned int cmd, unsigned long arg)
{
	int ret = -ENOTTY;
	int time;

	switch (cmd) {
	case WDIOC_GETSUPPORT:
		ret = copy_to_user((struct watchdog_info *)arg, &ident,
				   sizeof(ident)) ? -EFAULT : 0;
		break;

	case WDIOC_GETSTATUS:
		ret = put_user(0, (int *)arg);
		break;

	case WDIOC_GETBOOTSTATUS:
		ret = put_user(boot_status, (int *)arg);
		break;

	case WDIOC_KEEPALIVE:
		wdt_enable();
		ret = 0;
		break;

	case WDIOC_SETTIMEOUT:
		ret = get_user(time, (int *)arg);
		if (ret)
			break;

		if (time <= 0 || time > MAX_HEARTBEAT) {
			ret = -EINVAL;
			break;
		}

		heartbeat = time;
		wdt_enable();
		/* Fall through */

	case WDIOC_GETTIMEOUT:
		ret = put_user(heartbeat, (int *)arg);
		break;
	}
	return ret;
}

static int pnx4008_wdt_release(struct inode *inode, struct file *file)
{
	if (!test_bit(WDT_OK_TO_CLOSE, &wdt_status))
		printk(KERN_WARNING "WATCHDOG: Device closed unexpectdly\n");

	wdt_disable();
	clear_bit(WDT_IN_USE, &wdt_status);
	clear_bit(WDT_OK_TO_CLOSE, &wdt_status);

	return 0;
}

static const struct file_operations pnx4008_wdt_fops = {
	.owner = THIS_MODULE,
	.llseek = no_llseek,
	.write = pnx4008_wdt_write,
	.unlocked_ioctl = pnx4008_wdt_ioctl,
	.open = pnx4008_wdt_open,
	.release = pnx4008_wdt_release,
};

static struct miscdevice pnx4008_wdt_miscdev = {
	.minor = WATCHDOG_MINOR,
	.name = "watchdog",
	.fops = &pnx4008_wdt_fops,
};

static int pnx4008_wdt_probe(struct platform_device *pdev)
{
	int ret = 0, size;
	struct resource *res;

	if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT)
		heartbeat = DEFAULT_HEARTBEAT;

	printk(KERN_INFO MODULE_NAME
		"PNX4008 Watchdog Timer: heartbeat %d sec\n", heartbeat);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL) {
		printk(KERN_INFO MODULE_NAME
			"failed to get memory region resouce\n");
		return -ENOENT;
	}

	size = res->end - res->start + 1;
	wdt_mem = request_mem_region(res->start, size, pdev->name);

	if (wdt_mem == NULL) {
		printk(KERN_INFO MODULE_NAME "failed to get memory region\n");
		return -ENOENT;
	}
	wdt_base = (void __iomem *)IO_ADDRESS(res->start);

	wdt_clk = clk_get(&pdev->dev, "wdt_ck");
	if (IS_ERR(wdt_clk)) {
		ret = PTR_ERR(wdt_clk);
		release_resource(wdt_mem);
		kfree(wdt_mem);
		goto out;
	} else
		clk_set_rate(wdt_clk, 1);

	ret = misc_register(&pnx4008_wdt_miscdev);
	if (ret < 0) {
		printk(KERN_ERR MODULE_NAME "cannot register misc device\n");
		release_resource(wdt_mem);
		kfree(wdt_mem);
		clk_set_rate(wdt_clk, 0);
	} else {
		boot_status = (__raw_readl(WDTIM_RES(wdt_base)) & WDOG_RESET) ?
		    WDIOF_CARDRESET : 0;
		wdt_disable();		/*disable for now */
		set_bit(WDT_DEVICE_INITED, &wdt_status);
	}

out:
	return ret;
}

static int pnx4008_wdt_remove(struct platform_device *pdev)
{
	misc_deregister(&pnx4008_wdt_miscdev);
	if (wdt_clk) {
		clk_set_rate(wdt_clk, 0);
		clk_put(wdt_clk);
		wdt_clk = NULL;
	}
	if (wdt_mem) {
		release_resource(wdt_mem);
		kfree(wdt_mem);
		wdt_mem = NULL;
	}
	return 0;
}

static struct platform_driver platform_wdt_driver = {
	.driver = {
		.name = "watchdog",
		.owner	= THIS_MODULE,
	},
	.probe = pnx4008_wdt_probe,
	.remove = pnx4008_wdt_remove,
};

static int __init pnx4008_wdt_init(void)
{
	return platform_driver_register(&platform_wdt_driver);
}

static void __exit pnx4008_wdt_exit(void)
{
	platform_driver_unregister(&platform_wdt_driver);
}

module_init(pnx4008_wdt_init);
module_exit(pnx4008_wdt_exit);

MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
MODULE_DESCRIPTION("PNX4008 Watchdog Driver");

module_param(heartbeat, int, 0);
MODULE_PARM_DESC(heartbeat,
		 "Watchdog heartbeat period in seconds from 1 to "
		 __MODULE_STRING(MAX_HEARTBEAT) ", default "
		 __MODULE_STRING(DEFAULT_HEARTBEAT));

module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout,
		 "Set to 1 to keep watchdog running after device release");

MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
MODULE_ALIAS("platform:watchdog");
Commit	Line	Data
9325fa36 VW	1	/*
	2	* drivers/char/watchdog/pnx4008_wdt.c
	3	*
	4	* Watchdog driver for PNX4008 board
	5	*
	6	* Authors: Dmitry Chigirev <source@mvista.com>,
	7	* Vitaly Wool <vitalywool@gmail.com>
	8	* Based on sa1100 driver,
	9	* Copyright (C) 2000 Oleg Drokin <green@crimea.edu>
	10	*
	11	* 2005-2006 (c) MontaVista Software, Inc. This file is licensed under
	12	* the terms of the GNU General Public License version 2. This program
	13	* is licensed "as is" without any warranty of any kind, whether express
	14	* or implied.
	15	*/
	16
9325fa36 VW	17	#include <linux/module.h>
	18	#include <linux/moduleparam.h>
	19	#include <linux/types.h>
	20	#include <linux/kernel.h>
	21	#include <linux/fs.h>
	22	#include <linux/miscdevice.h>
	23	#include <linux/watchdog.h>
	24	#include <linux/init.h>
	25	#include <linux/bitops.h>
	26	#include <linux/ioport.h>
	27	#include <linux/device.h>
	28	#include <linux/platform_device.h>
	29	#include <linux/clk.h>
99d2853a	30	#include <linux/spinlock.h>
84ca995c AC	31	#include <linux/uaccess.h>
84ca995c AC	32	#include <linux/io.h>
9325fa36	33
089ab079 WVS	34	#include <asm/hardware.h>
089ab079 WVS	35
9325fa36 VW	36	#define MODULE_NAME "PNX4008-WDT: "
	37
	38	/* WatchDog Timer - Chapter 23 Page 207 */
	39
	40	#define DEFAULT_HEARTBEAT 19
	41	#define MAX_HEARTBEAT 60
	42
	43	/* Watchdog timer register set definition */
	44	#define WDTIM_INT(p) ((p) + 0x0)
	45	#define WDTIM_CTRL(p) ((p) + 0x4)
	46	#define WDTIM_COUNTER(p) ((p) + 0x8)
	47	#define WDTIM_MCTRL(p) ((p) + 0xC)
	48	#define WDTIM_MATCH0(p) ((p) + 0x10)
	49	#define WDTIM_EMR(p) ((p) + 0x14)
	50	#define WDTIM_PULSE(p) ((p) + 0x18)
	51	#define WDTIM_RES(p) ((p) + 0x1C)
	52
	53	/* WDTIM_INT bit definitions */
	54	#define MATCH_INT 1
	55
	56	/* WDTIM_CTRL bit definitions */
	57	#define COUNT_ENAB 1
	58	#define RESET_COUNT (1<<1)
	59	#define DEBUG_EN (1<<2)
	60
	61	/* WDTIM_MCTRL bit definitions */
	62	#define MR0_INT 1
	63	#undef RESET_COUNT0
	64	#define RESET_COUNT0 (1<<2)
	65	#define STOP_COUNT0 (1<<2)
	66	#define M_RES1 (1<<3)
	67	#define M_RES2 (1<<4)
	68	#define RESFRC1 (1<<5)
	69	#define RESFRC2 (1<<6)
	70
	71	/* WDTIM_EMR bit definitions */
	72	#define EXT_MATCH0 1
	73	#define MATCH_OUTPUT_HIGH (2<<4) /a MATCH_CTRL setting /
	74
	75	/* WDTIM_RES bit definitions */
	76	#define WDOG_RESET 1 /* read only */
	77
	78	#define WDOG_COUNTER_RATE 13000000 /the counter clock is 13 MHz fixed /
	79
28981727	80	static int nowayout = WATCHDOG_NOWAYOUT;
9325fa36 VW	81	static int heartbeat = DEFAULT_HEARTBEAT;
9325fa36 VW	82
c7dfd0cc	83	static DEFINE_SPINLOCK(io_lock);
9325fa36 VW	84	static unsigned long wdt_status;
	85	#define WDT_IN_USE 0
	86	#define WDT_OK_TO_CLOSE 1
	87	#define WDT_REGION_INITED 2
	88	#define WDT_DEVICE_INITED 3
	89
	90	static unsigned long boot_status;
	91
	92	static struct resource *wdt_mem;
	93	static void __iomem *wdt_base;
	94	struct clk *wdt_clk;
	95
	96	static void wdt_enable(void)
	97	{
99d2853a WVS	98	spin_lock(&io_lock);
99d2853a WVS	99
9325fa36 VW	100	if (wdt_clk)
	101	clk_set_rate(wdt_clk, 1);
	102
	103	/* stop counter, initiate counter reset */
	104	__raw_writel(RESET_COUNT, WDTIM_CTRL(wdt_base));
	105	/wait for reset to complete. 100% guarantee event /
65a64ec3 VW	106	while (__raw_readl(WDTIM_COUNTER(wdt_base)))
65a64ec3 VW	107	cpu_relax();
9325fa36 VW	108	/* internal and external reset, stop after that */
	109	__raw_writel(M_RES2 \| STOP_COUNT0 \| RESET_COUNT0,
	110	WDTIM_MCTRL(wdt_base));
	111	/* configure match output */
	112	__raw_writel(MATCH_OUTPUT_HIGH, WDTIM_EMR(wdt_base));
	113	/* clear interrupt, just in case */
	114	__raw_writel(MATCH_INT, WDTIM_INT(wdt_base));
	115	/* the longest pulse period 65541/(1310^6) seconds ~ 5 ms. /
	116	__raw_writel(0xFFFF, WDTIM_PULSE(wdt_base));
	117	__raw_writel(heartbeat * WDOG_COUNTER_RATE, WDTIM_MATCH0(wdt_base));
	118	/enable counter, stop when debugger active /
	119	__raw_writel(COUNT_ENAB \| DEBUG_EN, WDTIM_CTRL(wdt_base));
99d2853a WVS	120
99d2853a WVS	121	spin_unlock(&io_lock);
9325fa36 VW	122	}
	123
	124	static void wdt_disable(void)
	125	{
99d2853a WVS	126	spin_lock(&io_lock);
99d2853a WVS	127
9325fa36 VW	128	__raw_writel(0, WDTIM_CTRL(wdt_base)); /stop counter /
	129	if (wdt_clk)
	130	clk_set_rate(wdt_clk, 0);
99d2853a WVS	131
99d2853a WVS	132	spin_unlock(&io_lock);
9325fa36 VW	133	}
	134
	135	static int pnx4008_wdt_open(struct inode inode, struct file file)
	136	{
	137	if (test_and_set_bit(WDT_IN_USE, &wdt_status))
	138	return -EBUSY;
	139
	140	clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
	141
	142	wdt_enable();
	143
	144	return nonseekable_open(inode, file);
	145	}
	146
84ca995c AC	147	static ssize_t pnx4008_wdt_write(struct file file, const char data,
84ca995c AC	148	size_t len, loff_t *ppos)
9325fa36	149	{
9325fa36 VW	150	if (len) {
	151	if (!nowayout) {
	152	size_t i;
	153
	154	clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
	155
	156	for (i = 0; i != len; i++) {
	157	char c;
	158
	159	if (get_user(c, data + i))
	160	return -EFAULT;
	161	if (c == 'V')
	162	set_bit(WDT_OK_TO_CLOSE, &wdt_status);
	163	}
	164	}
	165	wdt_enable();
	166	}
	167
	168	return len;
	169	}
	170
84ca995c	171	static const struct watchdog_info ident = {
9325fa36 VW	172	.options = WDIOF_CARDRESET \| WDIOF_MAGICCLOSE \|
	173	WDIOF_SETTIMEOUT \| WDIOF_KEEPALIVEPING,
	174	.identity = "PNX4008 Watchdog",
	175	};
	176
84ca995c AC	177	static long pnx4008_wdt_ioctl(struct inode inode, struct file file,
84ca995c AC	178	unsigned int cmd, unsigned long arg)
9325fa36	179	{
f311896a	180	int ret = -ENOTTY;
9325fa36 VW	181	int time;
	182
	183	switch (cmd) {
	184	case WDIOC_GETSUPPORT:
	185	ret = copy_to_user((struct watchdog_info *)arg, &ident,
	186	sizeof(ident)) ? -EFAULT : 0;
	187	break;
	188
	189	case WDIOC_GETSTATUS:
	190	ret = put_user(0, (int *)arg);
	191	break;
	192
	193	case WDIOC_GETBOOTSTATUS:
	194	ret = put_user(boot_status, (int *)arg);
	195	break;
	196
0c06090c WVS	197	case WDIOC_KEEPALIVE:
	198	wdt_enable();
	199	ret = 0;
	200	break;
	201
9325fa36 VW	202	case WDIOC_SETTIMEOUT:
	203	ret = get_user(time, (int *)arg);
	204	if (ret)
	205	break;
	206
	207	if (time <= 0 \|\| time > MAX_HEARTBEAT) {
	208	ret = -EINVAL;
	209	break;
	210	}
	211
	212	heartbeat = time;
	213	wdt_enable();
	214	/* Fall through */
	215
	216	case WDIOC_GETTIMEOUT:
	217	ret = put_user(heartbeat, (int *)arg);
	218	break;
9325fa36 VW	219	}
	220	return ret;
	221	}
	222
	223	static int pnx4008_wdt_release(struct inode inode, struct file file)
	224	{
	225	if (!test_bit(WDT_OK_TO_CLOSE, &wdt_status))
	226	printk(KERN_WARNING "WATCHDOG: Device closed unexpectdly\n");
	227
	228	wdt_disable();
	229	clear_bit(WDT_IN_USE, &wdt_status);
	230	clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
	231
	232	return 0;
	233	}
	234
2b8693c0	235	static const struct file_operations pnx4008_wdt_fops = {
9325fa36 VW	236	.owner = THIS_MODULE,
	237	.llseek = no_llseek,
	238	.write = pnx4008_wdt_write,
84ca995c	239	.unlocked_ioctl = pnx4008_wdt_ioctl,
9325fa36 VW	240	.open = pnx4008_wdt_open,
	241	.release = pnx4008_wdt_release,
	242	};
	243
	244	static struct miscdevice pnx4008_wdt_miscdev = {
	245	.minor = WATCHDOG_MINOR,
	246	.name = "watchdog",
	247	.fops = &pnx4008_wdt_fops,
	248	};
	249
	250	static int pnx4008_wdt_probe(struct platform_device *pdev)
	251	{
	252	int ret = 0, size;
	253	struct resource *res;
	254
	255	if (heartbeat < 1 \|\| heartbeat > MAX_HEARTBEAT)
	256	heartbeat = DEFAULT_HEARTBEAT;
	257
	258	printk(KERN_INFO MODULE_NAME
	259	"PNX4008 Watchdog Timer: heartbeat %d sec\n", heartbeat);
	260
	261	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	262	if (res == NULL) {
	263	printk(KERN_INFO MODULE_NAME
	264	"failed to get memory region resouce\n");
	265	return -ENOENT;
	266	}
	267
	268	size = res->end - res->start + 1;
	269	wdt_mem = request_mem_region(res->start, size, pdev->name);
	270
	271	if (wdt_mem == NULL) {
	272	printk(KERN_INFO MODULE_NAME "failed to get memory region\n");
	273	return -ENOENT;
	274	}
	275	wdt_base = (void __iomem *)IO_ADDRESS(res->start);
	276
	277	wdt_clk = clk_get(&pdev->dev, "wdt_ck");
9cd44619 AM	278	if (IS_ERR(wdt_clk)) {
9cd44619 AM	279	ret = PTR_ERR(wdt_clk);
9325fa36 VW	280	release_resource(wdt_mem);
	281	kfree(wdt_mem);
	282	goto out;
	283	} else
	284	clk_set_rate(wdt_clk, 1);
	285
	286	ret = misc_register(&pnx4008_wdt_miscdev);
	287	if (ret < 0) {
	288	printk(KERN_ERR MODULE_NAME "cannot register misc device\n");
	289	release_resource(wdt_mem);
	290	kfree(wdt_mem);
	291	clk_set_rate(wdt_clk, 0);
	292	} else {
	293	boot_status = (__raw_readl(WDTIM_RES(wdt_base)) & WDOG_RESET) ?
	294	WDIOF_CARDRESET : 0;
	295	wdt_disable(); /disable for now /
	296	set_bit(WDT_DEVICE_INITED, &wdt_status);
	297	}
	298
	299	out:
	300	return ret;
	301	}
	302
	303	static int pnx4008_wdt_remove(struct platform_device *pdev)
	304	{
f6764497	305	misc_deregister(&pnx4008_wdt_miscdev);
9325fa36 VW	306	if (wdt_clk) {
	307	clk_set_rate(wdt_clk, 0);
	308	clk_put(wdt_clk);
	309	wdt_clk = NULL;
	310	}
f6764497 WVS	311	if (wdt_mem) {
	312	release_resource(wdt_mem);
	313	kfree(wdt_mem);
	314	wdt_mem = NULL;
	315	}
9325fa36 VW	316	return 0;
	317	}
	318
	319	static struct platform_driver platform_wdt_driver = {
	320	.driver = {
	321	.name = "watchdog",
f37d193c	322	.owner = THIS_MODULE,
9325fa36 VW	323	},
	324	.probe = pnx4008_wdt_probe,
	325	.remove = pnx4008_wdt_remove,
	326	};
	327
	328	static int __init pnx4008_wdt_init(void)
	329	{
	330	return platform_driver_register(&platform_wdt_driver);
	331	}
	332
	333	static void __exit pnx4008_wdt_exit(void)
	334	{
bb0a38d8	335	platform_driver_unregister(&platform_wdt_driver);
9325fa36 VW	336	}
	337
	338	module_init(pnx4008_wdt_init);
	339	module_exit(pnx4008_wdt_exit);
	340
	341	MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
	342	MODULE_DESCRIPTION("PNX4008 Watchdog Driver");
	343
	344	module_param(heartbeat, int, 0);
	345	MODULE_PARM_DESC(heartbeat,
	346	"Watchdog heartbeat period in seconds from 1 to "
	347	__MODULE_STRING(MAX_HEARTBEAT) ", default "
	348	__MODULE_STRING(DEFAULT_HEARTBEAT));
	349
	350	module_param(nowayout, int, 0);
	351	MODULE_PARM_DESC(nowayout,
	352	"Set to 1 to keep watchdog running after device release");
	353
	354	MODULE_LICENSE("GPL");
	355	MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
f37d193c	356	MODULE_ALIAS("platform:watchdog");