[deliverable/linux.git] / drivers / watchdog / at32ap700x_wdt.c

/*
 * Watchdog driver for Atmel AT32AP700X devices
 *
 * Copyright (C) 2005-2006 Atmel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/miscdevice.h>
#include <linux/fs.h>
#include <linux/platform_device.h>
#include <linux/watchdog.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/spinlock.h>

#define TIMEOUT_MIN		1
#define TIMEOUT_MAX		2
#define TIMEOUT_DEFAULT		TIMEOUT_MAX

/* module parameters */
static int timeout =  TIMEOUT_DEFAULT;
module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout,
		"Timeout value. Limited to be 1 or 2 seconds. (default="
		__MODULE_STRING(TIMEOUT_DEFAULT) ")");

static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
		__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

/* Watchdog registers and write/read macro */
#define WDT_CTRL		0x00
#define WDT_CTRL_EN		   0
#define WDT_CTRL_PSEL		   8
#define WDT_CTRL_KEY		  24

#define WDT_CLR			0x04

#define WDT_BIT(name)		(1 << WDT_##name)
#define WDT_BF(name, value)	((value) << WDT_##name)

#define wdt_readl(dev, reg)				\
	__raw_readl((dev)->regs + WDT_##reg)
#define wdt_writel(dev, reg, value)			\
	__raw_writel((value), (dev)->regs + WDT_##reg)

struct wdt_at32ap700x {
	void __iomem		*regs;
	spinlock_t		io_lock;
	int			timeout;
	unsigned long		users;
	struct miscdevice	miscdev;
};

static struct wdt_at32ap700x *wdt;
static char expect_release;

/*
 * Disable the watchdog.
 */
static inline void at32_wdt_stop(void)
{
	unsigned long psel;

	spin_lock(&wdt->io_lock);
	psel = wdt_readl(wdt, CTRL) & WDT_BF(CTRL_PSEL, 0x0f);
	wdt_writel(wdt, CTRL, psel | WDT_BF(CTRL_KEY, 0x55));
	wdt_writel(wdt, CTRL, psel | WDT_BF(CTRL_KEY, 0xaa));
	spin_unlock(&wdt->io_lock);
}

/*
 * Enable and reset the watchdog.
 */
static inline void at32_wdt_start(void)
{
	/* 0xf is 2^16 divider = 2 sec, 0xe is 2^15 divider = 1 sec */
	unsigned long psel = (wdt->timeout > 1) ? 0xf : 0xe;

	spin_lock(&wdt->io_lock);
	wdt_writel(wdt, CTRL, WDT_BIT(CTRL_EN)
			| WDT_BF(CTRL_PSEL, psel)
			| WDT_BF(CTRL_KEY, 0x55));
	wdt_writel(wdt, CTRL, WDT_BIT(CTRL_EN)
			| WDT_BF(CTRL_PSEL, psel)
			| WDT_BF(CTRL_KEY, 0xaa));
	spin_unlock(&wdt->io_lock);
}

/*
 * Pat the watchdog timer.
 */
static inline void at32_wdt_pat(void)
{
	spin_lock(&wdt->io_lock);
	wdt_writel(wdt, CLR, 0x42);
	spin_unlock(&wdt->io_lock);
}

/*
 * Watchdog device is opened, and watchdog starts running.
 */
static int at32_wdt_open(struct inode *inode, struct file *file)
{
	if (test_and_set_bit(1, &wdt->users))
		return -EBUSY;

	at32_wdt_start();
	return nonseekable_open(inode, file);
}

/*
 * Close the watchdog device.
 */
static int at32_wdt_close(struct inode *inode, struct file *file)
{
	if (expect_release == 42) {
		at32_wdt_stop();
	} else {
		dev_dbg(wdt->miscdev.parent,
			"Unexpected close, not stopping watchdog!\n");
		at32_wdt_pat();
	}
	clear_bit(1, &wdt->users);
	expect_release = 0;
	return 0;
}

/*
 * Change the watchdog time interval.
 */
static int at32_wdt_settimeout(int time)
{
	/*
	 * All counting occurs at 1 / SLOW_CLOCK (32 kHz) and max prescaler is
	 * 2 ^ 16 allowing up to 2 seconds timeout.
	 */
	if ((time < TIMEOUT_MIN) || (time > TIMEOUT_MAX))
		return -EINVAL;

	/*
	 * Set new watchdog time. It will be used when at32_wdt_start() is
	 * called.
	 */
	wdt->timeout = time;
	return 0;
}

static struct watchdog_info at32_wdt_info = {
	.identity	= "at32ap700x watchdog",
	.options	= WDIOF_SETTIMEOUT |
			  WDIOF_KEEPALIVEPING |
			  WDIOF_MAGICCLOSE,
};

/*
 * Handle commands from user-space.
 */
static int at32_wdt_ioctl(struct inode *inode, struct file *file,
		unsigned int cmd, unsigned long arg)
{
	int ret = -ENOTTY;
	int time;
	void __user *argp = (void __user *)arg;
	int __user *p = argp;

	switch (cmd) {
	case WDIOC_KEEPALIVE:
		at32_wdt_pat();
		ret = 0;
		break;
	case WDIOC_GETSUPPORT:
		ret = copy_to_user(argp, &at32_wdt_info,
				sizeof(at32_wdt_info)) ? -EFAULT : 0;
		break;
	case WDIOC_SETTIMEOUT:
		ret = get_user(time, p);
		if (ret)
			break;
		ret = at32_wdt_settimeout(time);
		if (ret)
			break;
		/* Enable new time value */
		at32_wdt_start();
		/* fall through */
	case WDIOC_GETTIMEOUT:
		ret = put_user(wdt->timeout, p);
		break;
	case WDIOC_GETSTATUS: /* fall through */
	case WDIOC_GETBOOTSTATUS:
		ret = put_user(0, p);
		break;
	case WDIOC_SETOPTIONS:
		ret = get_user(time, p);
		if (ret)
			break;
		if (time & WDIOS_DISABLECARD)
			at32_wdt_stop();
		if (time & WDIOS_ENABLECARD)
			at32_wdt_start();
		ret = 0;
		break;
	}

	return ret;
}

static ssize_t at32_wdt_write(struct file *file, const char __user *data,
				size_t len, loff_t *ppos)
{
	/* See if we got the magic character 'V' and reload the timer */
	if (len) {
		if (!nowayout) {
			size_t i;

			/*
			 * note: just in case someone wrote the magic
			 * character five months ago...
			 */
			expect_release = 0;

			/*
			 * scan to see whether or not we got the magic
			 * character
			 */
			for (i = 0; i != len; i++) {
				char c;
				if (get_user(c, data+i))
					return -EFAULT;
				if (c == 'V')
					expect_release = 42;
			}
		}
		/* someone wrote to us, we should pat the watchdog */
		at32_wdt_pat();
	}
	return len;
}

static const struct file_operations at32_wdt_fops = {
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.ioctl		= at32_wdt_ioctl,
	.open		= at32_wdt_open,
	.release	= at32_wdt_close,
	.write		= at32_wdt_write,
};

static int __init at32_wdt_probe(struct platform_device *pdev)
{
	struct resource	*regs;
	int ret;

	if (wdt) {
		dev_dbg(&pdev->dev, "only 1 wdt instance supported.\n");
		return -EBUSY;
	}

	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!regs) {
		dev_dbg(&pdev->dev, "missing mmio resource\n");
		return -ENXIO;
	}

	wdt = kzalloc(sizeof(struct wdt_at32ap700x), GFP_KERNEL);
	if (!wdt) {
		dev_dbg(&pdev->dev, "no memory for wdt structure\n");
		return -ENOMEM;
	}

	wdt->regs = ioremap(regs->start, regs->end - regs->start + 1);
	if (!wdt->regs) {
		ret = -ENOMEM;
		dev_dbg(&pdev->dev, "could not map I/O memory\n");
		goto err_free;
	}
	spin_lock_init(&wdt->io_lock);
	wdt->users = 0;
	wdt->miscdev.minor = WATCHDOG_MINOR;
	wdt->miscdev.name = "watchdog";
	wdt->miscdev.fops = &at32_wdt_fops;

	if (at32_wdt_settimeout(timeout)) {
		at32_wdt_settimeout(TIMEOUT_DEFAULT);
		dev_dbg(&pdev->dev,
			"default timeout invalid, set to %d sec.\n",
			TIMEOUT_DEFAULT);
	}

	ret = misc_register(&wdt->miscdev);
	if (ret) {
		dev_dbg(&pdev->dev, "failed to register wdt miscdev\n");
		goto err_iounmap;
	}

	platform_set_drvdata(pdev, wdt);
	wdt->miscdev.parent = &pdev->dev;
	dev_info(&pdev->dev,
		"AT32AP700X WDT at 0x%p, timeout %d sec (nowayout=%d)\n",
		wdt->regs, wdt->timeout, nowayout);

	return 0;

err_iounmap:
	iounmap(wdt->regs);
err_free:
	kfree(wdt);
	wdt = NULL;
	return ret;
}

static int __exit at32_wdt_remove(struct platform_device *pdev)
{
	if (wdt && platform_get_drvdata(pdev) == wdt) {
		/* Stop the timer before we leave */
		if (!nowayout)
			at32_wdt_stop();

		misc_deregister(&wdt->miscdev);
		iounmap(wdt->regs);
		kfree(wdt);
		wdt = NULL;
		platform_set_drvdata(pdev, NULL);
	}

	return 0;
}

static void at32_wdt_shutdown(struct platform_device *pdev)
{
	at32_wdt_stop();
}

#ifdef CONFIG_PM
static int at32_wdt_suspend(struct platform_device *pdev, pm_message_t message)
{
	at32_wdt_stop();
	return 0;
}

static int at32_wdt_resume(struct platform_device *pdev)
{
	if (wdt->users)
		at32_wdt_start();
	return 0;
}
#else
#define at32_wdt_suspend NULL
#define at32_wdt_resume NULL
#endif

static struct platform_driver at32_wdt_driver = {
	.remove		= __exit_p(at32_wdt_remove),
	.suspend	= at32_wdt_suspend,
	.resume		= at32_wdt_resume,
	.driver		= {
		.name	= "at32_wdt",
		.owner	= THIS_MODULE,
	},
	.shutdown	= at32_wdt_shutdown,
};

static int __init at32_wdt_init(void)
{
	return platform_driver_probe(&at32_wdt_driver, at32_wdt_probe);
}
module_init(at32_wdt_init);

static void __exit at32_wdt_exit(void)
{
	platform_driver_unregister(&at32_wdt_driver);
}
module_exit(at32_wdt_exit);

MODULE_AUTHOR("Hans-Christian Egtvedt <hcegtvedt@atmel.com>");
MODULE_DESCRIPTION("Watchdog driver for Atmel AT32AP700X");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
Commit	Line	Data
a9cb3959 HCE	1	/*
	2	* Watchdog driver for Atmel AT32AP700X devices
	3	*
	4	* Copyright (C) 2005-2006 Atmel Corporation
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
	11	#include <linux/init.h>
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
	14	#include <linux/moduleparam.h>
	15	#include <linux/miscdevice.h>
	16	#include <linux/fs.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/watchdog.h>
c37f2713 AM	19	#include <linux/uaccess.h>
c37f2713 AM	20	#include <linux/io.h>
e75e6577	21	#include <linux/spinlock.h>
a9cb3959 HCE	22
a9cb3959 HCE	23	#define TIMEOUT_MIN 1
a9cb3959	24	#define TIMEOUT_MAX 2
726c9f61 WVS	25	#define TIMEOUT_DEFAULT TIMEOUT_MAX
	26
	27	/* module parameters */
	28	static int timeout = TIMEOUT_DEFAULT;
	29	module_param(timeout, int, 0);
	30	MODULE_PARM_DESC(timeout,
	31	"Timeout value. Limited to be 1 or 2 seconds. (default="
	32	__MODULE_STRING(TIMEOUT_DEFAULT) ")");
a9cb3959	33
28401140 WVS	34	static int nowayout = WATCHDOG_NOWAYOUT;
	35	module_param(nowayout, int, 0);
	36	MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
	37	__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
	38
a9cb3959 HCE	39	/* Watchdog registers and write/read macro */
	40	#define WDT_CTRL 0x00
	41	#define WDT_CTRL_EN 0
	42	#define WDT_CTRL_PSEL 8
	43	#define WDT_CTRL_KEY 24
	44
	45	#define WDT_CLR 0x04
	46
	47	#define WDT_BIT(name) (1 << WDT_##name)
c0ead7e0	48	#define WDT_BF(name, value) ((value) << WDT_##name)
a9cb3959	49
c0ead7e0	50	#define wdt_readl(dev, reg) \
a9cb3959	51	__raw_readl((dev)->regs + WDT_##reg)
c0ead7e0	52	#define wdt_writel(dev, reg, value) \
a9cb3959 HCE	53	__raw_writel((value), (dev)->regs + WDT_##reg)
	54
	55	struct wdt_at32ap700x {
	56	void __iomem *regs;
e75e6577	57	spinlock_t io_lock;
a9cb3959	58	int timeout;
7e2a1498	59	unsigned long users;
a9cb3959 HCE	60	struct miscdevice miscdev;
	61	};
	62
	63	static struct wdt_at32ap700x *wdt;
28401140	64	static char expect_release;
a9cb3959 HCE	65
	66	/*
	67	* Disable the watchdog.
	68	*/
c0ead7e0	69	static inline void at32_wdt_stop(void)
a9cb3959	70	{
7e2a1498 WVS	71	unsigned long psel;
7e2a1498 WVS	72
e75e6577	73	spin_lock(&wdt->io_lock);
7e2a1498	74	psel = wdt_readl(wdt, CTRL) & WDT_BF(CTRL_PSEL, 0x0f);
a9cb3959 HCE	75	wdt_writel(wdt, CTRL, psel \| WDT_BF(CTRL_KEY, 0x55));
a9cb3959 HCE	76	wdt_writel(wdt, CTRL, psel \| WDT_BF(CTRL_KEY, 0xaa));
e75e6577	77	spin_unlock(&wdt->io_lock);
a9cb3959 HCE	78	}
	79
	80	/*
	81	* Enable and reset the watchdog.
	82	*/
c0ead7e0	83	static inline void at32_wdt_start(void)
a9cb3959 HCE	84	{
	85	/* 0xf is 2^16 divider = 2 sec, 0xe is 2^15 divider = 1 sec */
	86	unsigned long psel = (wdt->timeout > 1) ? 0xf : 0xe;
	87
e75e6577	88	spin_lock(&wdt->io_lock);
a9cb3959 HCE	89	wdt_writel(wdt, CTRL, WDT_BIT(CTRL_EN)
	90	\| WDT_BF(CTRL_PSEL, psel)
	91	\| WDT_BF(CTRL_KEY, 0x55));
	92	wdt_writel(wdt, CTRL, WDT_BIT(CTRL_EN)
	93	\| WDT_BF(CTRL_PSEL, psel)
	94	\| WDT_BF(CTRL_KEY, 0xaa));
e75e6577	95	spin_unlock(&wdt->io_lock);
a9cb3959 HCE	96	}
	97
	98	/*
	99	* Pat the watchdog timer.
	100	*/
c0ead7e0	101	static inline void at32_wdt_pat(void)
a9cb3959	102	{
e75e6577	103	spin_lock(&wdt->io_lock);
a9cb3959	104	wdt_writel(wdt, CLR, 0x42);
e75e6577	105	spin_unlock(&wdt->io_lock);
a9cb3959 HCE	106	}
	107
	108	/*
	109	* Watchdog device is opened, and watchdog starts running.
	110	*/
	111	static int at32_wdt_open(struct inode inode, struct file file)
	112	{
	113	if (test_and_set_bit(1, &wdt->users))
	114	return -EBUSY;
	115
	116	at32_wdt_start();
	117	return nonseekable_open(inode, file);
	118	}
	119
	120	/*
28401140	121	* Close the watchdog device.
a9cb3959 HCE	122	*/
	123	static int at32_wdt_close(struct inode inode, struct file file)
	124	{
28401140 WVS	125	if (expect_release == 42) {
	126	at32_wdt_stop();
	127	} else {
	128	dev_dbg(wdt->miscdev.parent,
	129	"Unexpected close, not stopping watchdog!\n");
	130	at32_wdt_pat();
	131	}
a9cb3959	132	clear_bit(1, &wdt->users);
28401140	133	expect_release = 0;
a9cb3959 HCE	134	return 0;
	135	}
	136
	137	/*
	138	* Change the watchdog time interval.
	139	*/
	140	static int at32_wdt_settimeout(int time)
	141	{
	142	/*
	143	* All counting occurs at 1 / SLOW_CLOCK (32 kHz) and max prescaler is
	144	* 2 ^ 16 allowing up to 2 seconds timeout.
	145	*/
	146	if ((time < TIMEOUT_MIN) \|\| (time > TIMEOUT_MAX))
	147	return -EINVAL;
	148
c37f2713 AM	149	/*
	150	* Set new watchdog time. It will be used when at32_wdt_start() is
	151	* called.
	152	*/
a9cb3959 HCE	153	wdt->timeout = time;
	154	return 0;
	155	}
	156
	157	static struct watchdog_info at32_wdt_info = {
	158	.identity = "at32ap700x watchdog",
28401140 WVS	159	.options = WDIOF_SETTIMEOUT \|
	160	WDIOF_KEEPALIVEPING \|
	161	WDIOF_MAGICCLOSE,
a9cb3959 HCE	162	};
	163
	164	/*
	165	* Handle commands from user-space.
	166	*/
	167	static int at32_wdt_ioctl(struct inode inode, struct file file,
	168	unsigned int cmd, unsigned long arg)
	169	{
	170	int ret = -ENOTTY;
	171	int time;
	172	void __user argp = (void __user )arg;
	173	int __user *p = argp;
	174
c37f2713	175	switch (cmd) {
a9cb3959 HCE	176	case WDIOC_KEEPALIVE:
	177	at32_wdt_pat();
	178	ret = 0;
	179	break;
	180	case WDIOC_GETSUPPORT:
	181	ret = copy_to_user(argp, &at32_wdt_info,
	182	sizeof(at32_wdt_info)) ? -EFAULT : 0;
	183	break;
	184	case WDIOC_SETTIMEOUT:
	185	ret = get_user(time, p);
	186	if (ret)
	187	break;
	188	ret = at32_wdt_settimeout(time);
	189	if (ret)
	190	break;
	191	/* Enable new time value */
	192	at32_wdt_start();
	193	/* fall through */
	194	case WDIOC_GETTIMEOUT:
	195	ret = put_user(wdt->timeout, p);
	196	break;
	197	case WDIOC_GETSTATUS: /* fall through */
	198	case WDIOC_GETBOOTSTATUS:
	199	ret = put_user(0, p);
	200	break;
	201	case WDIOC_SETOPTIONS:
	202	ret = get_user(time, p);
	203	if (ret)
	204	break;
	205	if (time & WDIOS_DISABLECARD)
	206	at32_wdt_stop();
	207	if (time & WDIOS_ENABLECARD)
	208	at32_wdt_start();
	209	ret = 0;
	210	break;
	211	}
	212
	213	return ret;
	214	}
	215
28401140 WVS	216	static ssize_t at32_wdt_write(struct file file, const char __user data,
28401140 WVS	217	size_t len, loff_t *ppos)
a9cb3959	218	{
28401140 WVS	219	/* See if we got the magic character 'V' and reload the timer */
	220	if (len) {
	221	if (!nowayout) {
	222	size_t i;
	223
	224	/*
	225	* note: just in case someone wrote the magic
	226	* character five months ago...
	227	*/
	228	expect_release = 0;
	229
	230	/*
	231	* scan to see whether or not we got the magic
	232	* character
	233	*/
	234	for (i = 0; i != len; i++) {
	235	char c;
	236	if (get_user(c, data+i))
	237	return -EFAULT;
	238	if (c == 'V')
	239	expect_release = 42;
	240	}
	241	}
	242	/* someone wrote to us, we should pat the watchdog */
	243	at32_wdt_pat();
	244	}
a9cb3959 HCE	245	return len;
	246	}
	247
	248	static const struct file_operations at32_wdt_fops = {
	249	.owner = THIS_MODULE,
	250	.llseek = no_llseek,
	251	.ioctl = at32_wdt_ioctl,
	252	.open = at32_wdt_open,
	253	.release = at32_wdt_close,
	254	.write = at32_wdt_write,
	255	};
	256
	257	static int __init at32_wdt_probe(struct platform_device *pdev)
	258	{
	259	struct resource *regs;
	260	int ret;
	261
	262	if (wdt) {
	263	dev_dbg(&pdev->dev, "only 1 wdt instance supported.\n");
	264	return -EBUSY;
	265	}
	266
	267	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	268	if (!regs) {
	269	dev_dbg(&pdev->dev, "missing mmio resource\n");
	270	return -ENXIO;
	271	}
	272
	273	wdt = kzalloc(sizeof(struct wdt_at32ap700x), GFP_KERNEL);
	274	if (!wdt) {
	275	dev_dbg(&pdev->dev, "no memory for wdt structure\n");
	276	return -ENOMEM;
	277	}
	278
	279	wdt->regs = ioremap(regs->start, regs->end - regs->start + 1);
47d17763 HCE	280	if (!wdt->regs) {
	281	ret = -ENOMEM;
	282	dev_dbg(&pdev->dev, "could not map I/O memory\n");
	283	goto err_free;
	284	}
e75e6577	285	spin_lock_init(&wdt->io_lock);
a9cb3959 HCE	286	wdt->users = 0;
	287	wdt->miscdev.minor = WATCHDOG_MINOR;
	288	wdt->miscdev.name = "watchdog";
	289	wdt->miscdev.fops = &at32_wdt_fops;
	290
726c9f61 WVS	291	if (at32_wdt_settimeout(timeout)) {
726c9f61 WVS	292	at32_wdt_settimeout(TIMEOUT_DEFAULT);
a9cb3959 HCE	293	dev_dbg(&pdev->dev,
a9cb3959 HCE	294	"default timeout invalid, set to %d sec.\n",
726c9f61	295	TIMEOUT_DEFAULT);
a9cb3959 HCE	296	}
	297
	298	ret = misc_register(&wdt->miscdev);
	299	if (ret) {
	300	dev_dbg(&pdev->dev, "failed to register wdt miscdev\n");
47d17763	301	goto err_iounmap;
a9cb3959 HCE	302	}
	303
	304	platform_set_drvdata(pdev, wdt);
	305	wdt->miscdev.parent = &pdev->dev;
28401140 WVS	306	dev_info(&pdev->dev,
	307	"AT32AP700X WDT at 0x%p, timeout %d sec (nowayout=%d)\n",
	308	wdt->regs, wdt->timeout, nowayout);
a9cb3959 HCE	309
	310	return 0;
	311
47d17763 HCE	312	err_iounmap:
	313	iounmap(wdt->regs);
	314	err_free:
a9cb3959 HCE	315	kfree(wdt);
	316	wdt = NULL;
	317	return ret;
	318	}
	319
	320	static int __exit at32_wdt_remove(struct platform_device *pdev)
	321	{
	322	if (wdt && platform_get_drvdata(pdev) == wdt) {
28401140 WVS	323	/* Stop the timer before we leave */
	324	if (!nowayout)
	325	at32_wdt_stop();
	326
a9cb3959	327	misc_deregister(&wdt->miscdev);
ff732316	328	iounmap(wdt->regs);
a9cb3959 HCE	329	kfree(wdt);
	330	wdt = NULL;
	331	platform_set_drvdata(pdev, NULL);
	332	}
	333
	334	return 0;
	335	}
	336
	337	static void at32_wdt_shutdown(struct platform_device *pdev)
	338	{
	339	at32_wdt_stop();
	340	}
	341
	342	#ifdef CONFIG_PM
	343	static int at32_wdt_suspend(struct platform_device *pdev, pm_message_t message)
	344	{
	345	at32_wdt_stop();
	346	return 0;
	347	}
	348
	349	static int at32_wdt_resume(struct platform_device *pdev)
	350	{
	351	if (wdt->users)
	352	at32_wdt_start();
	353	return 0;
	354	}
97a2a2ea AM	355	#else
	356	#define at32_wdt_suspend NULL
	357	#define at32_wdt_resume NULL
a9cb3959 HCE	358	#endif
	359
	360	static struct platform_driver at32_wdt_driver = {
	361	.remove = __exit_p(at32_wdt_remove),
a9cb3959 HCE	362	.suspend = at32_wdt_suspend,
a9cb3959 HCE	363	.resume = at32_wdt_resume,
a9cb3959 HCE	364	.driver = {
	365	.name = "at32_wdt",
	366	.owner = THIS_MODULE,
	367	},
	368	.shutdown = at32_wdt_shutdown,
	369	};
	370
	371	static int __init at32_wdt_init(void)
	372	{
	373	return platform_driver_probe(&at32_wdt_driver, at32_wdt_probe);
	374	}
	375	module_init(at32_wdt_init);
	376
	377	static void __exit at32_wdt_exit(void)
	378	{
	379	platform_driver_unregister(&at32_wdt_driver);
	380	}
	381	module_exit(at32_wdt_exit);
	382
	383	MODULE_AUTHOR("Hans-Christian Egtvedt <hcegtvedt@atmel.com>");
	384	MODULE_DESCRIPTION("Watchdog driver for Atmel AT32AP700X");
	385	MODULE_LICENSE("GPL");
	386	MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);