[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / watchdog / alim1535_wdt.c

/*
 *	Watchdog for the 7101 PMU version found in the ALi M1535 chipsets
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/ioport.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/pci.h>
#include <linux/uaccess.h>
#include <linux/io.h>

#define WATCHDOG_NAME "ALi_M1535"
#define WATCHDOG_TIMEOUT 60	/* 60 sec default timeout */

/* internal variables */
static unsigned long ali_is_open;
static char ali_expect_release;
static struct pci_dev *ali_pci;
static u32 ali_timeout_bits;		/* stores the computed timeout */
static DEFINE_SPINLOCK(ali_lock);	/* Guards the hardware */

/* module parameters */
static int timeout = WATCHDOG_TIMEOUT;
module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout,
		"Watchdog timeout in seconds. (0 < timeout < 18000, default="
				__MODULE_STRING(WATCHDOG_TIMEOUT) ")");

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

/*
 *	ali_start	-	start watchdog countdown
 *
 *	Starts the timer running providing the timer has a counter
 *	configuration set.
 */

static void ali_start(void)
{
	u32 val;

	spin_lock(&ali_lock);

	pci_read_config_dword(ali_pci, 0xCC, &val);
	val &= ~0x3F;	/* Mask count */
	val |= (1 << 25) | ali_timeout_bits;
	pci_write_config_dword(ali_pci, 0xCC, val);

	spin_unlock(&ali_lock);
}

/*
 *	ali_stop	-	stop the timer countdown
 *
 *	Stop the ALi watchdog countdown
 */

static void ali_stop(void)
{
	u32 val;

	spin_lock(&ali_lock);

	pci_read_config_dword(ali_pci, 0xCC, &val);
	val &= ~0x3F;		/* Mask count to zero (disabled) */
	val &= ~(1 << 25);	/* and for safety mask the reset enable */
	pci_write_config_dword(ali_pci, 0xCC, val);

	spin_unlock(&ali_lock);
}

/*
 *	ali_keepalive	-	send a keepalive to the watchdog
 *
 *	Send a keepalive to the timer (actually we restart the timer).
 */

static void ali_keepalive(void)
{
	ali_start();
}

/*
 *	ali_settimer	-	compute the timer reload value
 *	@t: time in seconds
 *
 *	Computes the timeout values needed
 */

static int ali_settimer(int t)
{
	if (t < 0)
		return -EINVAL;
	else if (t < 60)
		ali_timeout_bits = t|(1 << 6);
	else if (t < 3600)
		ali_timeout_bits = (t / 60)|(1 << 7);
	else if (t < 18000)
		ali_timeout_bits = (t / 300)|(1 << 6)|(1 << 7);
	else
		return -EINVAL;

	timeout = t;
	return 0;
}

/*
 *	/dev/watchdog handling
 */

/*
 *	ali_write	-	writes to ALi watchdog
 *	@file: file from VFS
 *	@data: user address of data
 *	@len: length of data
 *	@ppos: pointer to the file offset
 *
 *	Handle a write to the ALi watchdog. Writing to the file pings
 *	the watchdog and resets it. Writing the magic 'V' sequence allows
 *	the next close to turn off the watchdog.
 */

static ssize_t ali_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... */
			ali_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')
					ali_expect_release = 42;
			}
		}

		/* someone wrote to us, we should reload the timer */
		ali_start();
	}
	return len;
}

/*
 *	ali_ioctl	-	handle watchdog ioctls
 *	@file: VFS file pointer
 *	@cmd: ioctl number
 *	@arg: arguments to the ioctl
 *
 *	Handle the watchdog ioctls supported by the ALi driver. Really
 *	we want an extension to enable irq ack monitoring and the like
 */

static long ali_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	void __user *argp = (void __user *)arg;
	int __user *p = argp;
	static const struct watchdog_info ident = {
		.options =		WDIOF_KEEPALIVEPING |
					WDIOF_SETTIMEOUT |
					WDIOF_MAGICCLOSE,
		.firmware_version =	0,
		.identity =		"ALi M1535 WatchDog Timer",
	};

	switch (cmd) {
	case WDIOC_GETSUPPORT:
		return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;

	case WDIOC_GETSTATUS:
	case WDIOC_GETBOOTSTATUS:
		return put_user(0, p);
	case WDIOC_SETOPTIONS:
	{
		int new_options, retval = -EINVAL;

		if (get_user(new_options, p))
			return -EFAULT;
		if (new_options & WDIOS_DISABLECARD) {
			ali_stop();
			retval = 0;
		}
		if (new_options & WDIOS_ENABLECARD) {
			ali_start();
			retval = 0;
		}
		return retval;
	}
	case WDIOC_KEEPALIVE:
		ali_keepalive();
		return 0;
	case WDIOC_SETTIMEOUT:
	{
		int new_timeout;
		if (get_user(new_timeout, p))
			return -EFAULT;
		if (ali_settimer(new_timeout))
			return -EINVAL;
		ali_keepalive();
		/* Fall */
	}
	case WDIOC_GETTIMEOUT:
		return put_user(timeout, p);
	default:
		return -ENOTTY;
	}
}

/*
 *	ali_open	-	handle open of ali watchdog
 *	@inode: inode from VFS
 *	@file: file from VFS
 *
 *	Open the ALi watchdog device. Ensure only one person opens it
 *	at a time. Also start the watchdog running.
 */

static int ali_open(struct inode *inode, struct file *file)
{
	/* /dev/watchdog can only be opened once */
	if (test_and_set_bit(0, &ali_is_open))
		return -EBUSY;

	/* Activate */
	ali_start();
	return nonseekable_open(inode, file);
}

/*
 *	ali_release	-	close an ALi watchdog
 *	@inode: inode from VFS
 *	@file: file from VFS
 *
 *	Close the ALi watchdog device. Actual shutdown of the timer
 *	only occurs if the magic sequence has been set.
 */

static int ali_release(struct inode *inode, struct file *file)
{
	/*
	 *      Shut off the timer.
	 */
	if (ali_expect_release == 42)
		ali_stop();
	else {
		pr_crit("Unexpected close, not stopping watchdog!\n");
		ali_keepalive();
	}
	clear_bit(0, &ali_is_open);
	ali_expect_release = 0;
	return 0;
}

/*
 *	ali_notify_sys	-	System down notifier
 *
 *	Notifier for system down
 */


static int ali_notify_sys(struct notifier_block *this,
					unsigned long code, void *unused)
{
	if (code == SYS_DOWN || code == SYS_HALT)
		ali_stop();		/* Turn the WDT off */
	return NOTIFY_DONE;
}

/*
 *	Data for PCI driver interface
 *
 *	This data only exists for exporting the supported
 *	PCI ids via MODULE_DEVICE_TABLE.  We do not actually
 *	register a pci_driver, because someone else might one day
 *	want to register another driver on the same PCI id.
 */

static DEFINE_PCI_DEVICE_TABLE(ali_pci_tbl) __used = {
	{ PCI_VENDOR_ID_AL, 0x1533, PCI_ANY_ID, PCI_ANY_ID,},
	{ PCI_VENDOR_ID_AL, 0x1535, PCI_ANY_ID, PCI_ANY_ID,},
	{ 0, },
};
MODULE_DEVICE_TABLE(pci, ali_pci_tbl);

/*
 *	ali_find_watchdog	-	find a 1535 and 7101
 *
 *	Scans the PCI hardware for a 1535 series bridge and matching 7101
 *	watchdog device. This may be overtight but it is better to be safe
 */

static int __init ali_find_watchdog(void)
{
	struct pci_dev *pdev;
	u32 wdog;

	/* Check for a 1533/1535 series bridge */
	pdev = pci_get_device(PCI_VENDOR_ID_AL, 0x1535, NULL);
	if (pdev == NULL)
		pdev = pci_get_device(PCI_VENDOR_ID_AL, 0x1533, NULL);
	if (pdev == NULL)
		return -ENODEV;
	pci_dev_put(pdev);

	/* Check for the a 7101 PMU */
	pdev = pci_get_device(PCI_VENDOR_ID_AL, 0x7101, NULL);
	if (pdev == NULL)
		return -ENODEV;

	if (pci_enable_device(pdev)) {
		pci_dev_put(pdev);
		return -EIO;
	}

	ali_pci = pdev;

	/*
	 *	Initialize the timer bits
	 */
	pci_read_config_dword(pdev, 0xCC, &wdog);

	/* Timer bits */
	wdog &= ~0x3F;
	/* Issued events */
	wdog &= ~((1 << 27)|(1 << 26)|(1 << 25)|(1 << 24));
	/* No monitor bits */
	wdog &= ~((1 << 16)|(1 << 13)|(1 << 12)|(1 << 11)|(1 << 10)|(1 << 9));

	pci_write_config_dword(pdev, 0xCC, wdog);

	return 0;
}

/*
 *	Kernel Interfaces
 */

static const struct file_operations ali_fops = {
	.owner		=	THIS_MODULE,
	.llseek		=	no_llseek,
	.write		=	ali_write,
	.unlocked_ioctl =	ali_ioctl,
	.open		=	ali_open,
	.release	=	ali_release,
};

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

static struct notifier_block ali_notifier = {
	.notifier_call =	ali_notify_sys,
};

/*
 *	watchdog_init	-	module initialiser
 *
 *	Scan for a suitable watchdog and if so initialize it. Return an error
 *	if we cannot, the error causes the module to unload
 */

static int __init watchdog_init(void)
{
	int ret;

	/* Check whether or not the hardware watchdog is there */
	if (ali_find_watchdog() != 0)
		return -ENODEV;

	/* Check that the timeout value is within it's range;
	   if not reset to the default */
	if (timeout < 1 || timeout >= 18000) {
		timeout = WATCHDOG_TIMEOUT;
		pr_info("timeout value must be 0 < timeout < 18000, using %d\n",
			timeout);
	}

	/* Calculate the watchdog's timeout */
	ali_settimer(timeout);

	ret = register_reboot_notifier(&ali_notifier);
	if (ret != 0) {
		pr_err("cannot register reboot notifier (err=%d)\n", ret);
		goto out;
	}

	ret = misc_register(&ali_miscdev);
	if (ret != 0) {
		pr_err("cannot register miscdev on minor=%d (err=%d)\n",
		       WATCHDOG_MINOR, ret);
		goto unreg_reboot;
	}

	pr_info("initialized. timeout=%d sec (nowayout=%d)\n",
		timeout, nowayout);

out:
	return ret;
unreg_reboot:
	unregister_reboot_notifier(&ali_notifier);
	goto out;
}

/*
 *	watchdog_exit	-	module de-initialiser
 *
 *	Called while unloading a successfully installed watchdog module.
 */

static void __exit watchdog_exit(void)
{
	/* Stop the timer before we leave */
	ali_stop();

	/* Deregister */
	misc_deregister(&ali_miscdev);
	unregister_reboot_notifier(&ali_notifier);
	pci_dev_put(ali_pci);
}

module_init(watchdog_init);
module_exit(watchdog_exit);

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("ALi M1535 PMU Watchdog Timer driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Watchdog for the 7101 PMU version found in the ALi M1535 chipsets
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
	8	*/
	9
27c766aa JP	10	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27c766aa JP	11
1da177e4 LT	12	#include <linux/module.h>
	13	#include <linux/moduleparam.h>
	14	#include <linux/types.h>
	15	#include <linux/miscdevice.h>
	16	#include <linux/watchdog.h>
	17	#include <linux/ioport.h>
	18	#include <linux/notifier.h>
	19	#include <linux/reboot.h>
	20	#include <linux/init.h>
	21	#include <linux/fs.h>
	22	#include <linux/pci.h>
173d95bc AC	23	#include <linux/uaccess.h>
173d95bc AC	24	#include <linux/io.h>
1da177e4 LT	25
1da177e4 LT	26	#define WATCHDOG_NAME "ALi_M1535"
1da177e4 LT	27	#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
	28
	29	/* internal variables */
	30	static unsigned long ali_is_open;
	31	static char ali_expect_release;
	32	static struct pci_dev *ali_pci;
173d95bc	33	static u32 ali_timeout_bits; /* stores the computed timeout */
c7dfd0cc	34	static DEFINE_SPINLOCK(ali_lock); /* Guards the hardware */
1da177e4 LT	35
	36	/* module parameters */
	37	static int timeout = WATCHDOG_TIMEOUT;
	38	module_param(timeout, int, 0);
173d95bc AC	39	MODULE_PARM_DESC(timeout,
	40	"Watchdog timeout in seconds. (0 < timeout < 18000, default="
	41	__MODULE_STRING(WATCHDOG_TIMEOUT) ")");
1da177e4	42
86a1e189 WVS	43	static bool nowayout = WATCHDOG_NOWAYOUT;
86a1e189 WVS	44	module_param(nowayout, bool, 0);
173d95bc AC	45	MODULE_PARM_DESC(nowayout,
	46	"Watchdog cannot be stopped once started (default="
	47	__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
1da177e4 LT	48
	49	/*
	50	* ali_start - start watchdog countdown
	51	*
	52	* Starts the timer running providing the timer has a counter
	53	* configuration set.
	54	*/
	55
	56	static void ali_start(void)
	57	{
	58	u32 val;
	59
	60	spin_lock(&ali_lock);
	61
	62	pci_read_config_dword(ali_pci, 0xCC, &val);
	63	val &= ~0x3F; /* Mask count */
143a2e54	64	val \|= (1 << 25) \| ali_timeout_bits;
1da177e4 LT	65	pci_write_config_dword(ali_pci, 0xCC, val);
	66
	67	spin_unlock(&ali_lock);
	68	}
	69
	70	/*
	71	* ali_stop - stop the timer countdown
	72	*
	73	* Stop the ALi watchdog countdown
	74	*/
	75
	76	static void ali_stop(void)
	77	{
	78	u32 val;
	79
	80	spin_lock(&ali_lock);
	81
	82	pci_read_config_dword(ali_pci, 0xCC, &val);
143a2e54 WVS	83	val &= ~0x3F; /* Mask count to zero (disabled) */
143a2e54 WVS	84	val &= ~(1 << 25); /* and for safety mask the reset enable */
1da177e4 LT	85	pci_write_config_dword(ali_pci, 0xCC, val);
	86
	87	spin_unlock(&ali_lock);
	88	}
	89
	90	/*
	91	* ali_keepalive - send a keepalive to the watchdog
	92	*
143a2e54	93	* Send a keepalive to the timer (actually we restart the timer).
1da177e4 LT	94	*/
	95
	96	static void ali_keepalive(void)
	97	{
	98	ali_start();
	99	}
	100
	101	/*
	102	* ali_settimer - compute the timer reload value
	103	* @t: time in seconds
	104	*
	105	* Computes the timeout values needed
	106	*/
	107
	108	static int ali_settimer(int t)
	109	{
173d95bc	110	if (t < 0)
1da177e4	111	return -EINVAL;
173d95bc	112	else if (t < 60)
143a2e54	113	ali_timeout_bits = t\|(1 << 6);
173d95bc	114	else if (t < 3600)
143a2e54	115	ali_timeout_bits = (t / 60)\|(1 << 7);
173d95bc	116	else if (t < 18000)
143a2e54	117	ali_timeout_bits = (t / 300)\|(1 << 6)\|(1 << 7);
173d95bc AC	118	else
173d95bc AC	119	return -EINVAL;
1da177e4 LT	120
	121	timeout = t;
	122	return 0;
	123	}
	124
	125	/*
	126	* /dev/watchdog handling
	127	*/
	128
	129	/*
	130	* ali_write - writes to ALi watchdog
	131	* @file: file from VFS
	132	* @data: user address of data
	133	* @len: length of data
	134	* @ppos: pointer to the file offset
	135	*
	136	* Handle a write to the ALi watchdog. Writing to the file pings
	137	* the watchdog and resets it. Writing the magic 'V' sequence allows
	138	* the next close to turn off the watchdog.
	139	*/
	140
	141	static ssize_t ali_write(struct file file, const char __user data,
143a2e54	142	size_t len, loff_t *ppos)
1da177e4 LT	143	{
	144	/* See if we got the magic character 'V' and reload the timer */
	145	if (len) {
	146	if (!nowayout) {
	147	size_t i;
	148
173d95bc AC	149	/* note: just in case someone wrote the
173d95bc AC	150	magic character five months ago... */
1da177e4 LT	151	ali_expect_release = 0;
1da177e4 LT	152
173d95bc AC	153	/* scan to see whether or not we got
173d95bc AC	154	the magic character */
1da177e4 LT	155	for (i = 0; i != len; i++) {
1da177e4 LT	156	char c;
7944d3a5	157	if (get_user(c, data + i))
1da177e4 LT	158	return -EFAULT;
	159	if (c == 'V')
	160	ali_expect_release = 42;
	161	}
	162	}
	163
	164	/* someone wrote to us, we should reload the timer */
	165	ali_start();
	166	}
	167	return len;
	168	}
	169
	170	/*
	171	* ali_ioctl - handle watchdog ioctls
1da177e4 LT	172	* @file: VFS file pointer
	173	* @cmd: ioctl number
	174	* @arg: arguments to the ioctl
	175	*
	176	* Handle the watchdog ioctls supported by the ALi driver. Really
	177	* we want an extension to enable irq ack monitoring and the like
	178	*/
	179
173d95bc	180	static long ali_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1da177e4 LT	181	{
	182	void __user argp = (void __user )arg;
	183	int __user *p = argp;
42747d71	184	static const struct watchdog_info ident = {
1da177e4 LT	185	.options = WDIOF_KEEPALIVEPING \|
	186	WDIOF_SETTIMEOUT \|
	187	WDIOF_MAGICCLOSE,
	188	.firmware_version = 0,
	189	.identity = "ALi M1535 WatchDog Timer",
	190	};
	191
	192	switch (cmd) {
173d95bc AC	193	case WDIOC_GETSUPPORT:
173d95bc AC	194	return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
1da177e4	195
173d95bc AC	196	case WDIOC_GETSTATUS:
	197	case WDIOC_GETBOOTSTATUS:
	198	return put_user(0, p);
173d95bc AC	199	case WDIOC_SETOPTIONS:
	200	{
	201	int new_options, retval = -EINVAL;
	202
	203	if (get_user(new_options, p))
	204	return -EFAULT;
	205	if (new_options & WDIOS_DISABLECARD) {
	206	ali_stop();
	207	retval = 0;
1da177e4	208	}
173d95bc AC	209	if (new_options & WDIOS_ENABLECARD) {
	210	ali_start();
	211	retval = 0;
1da177e4	212	}
173d95bc AC	213	return retval;
173d95bc AC	214	}
0c06090c WVS	215	case WDIOC_KEEPALIVE:
	216	ali_keepalive();
	217	return 0;
173d95bc AC	218	case WDIOC_SETTIMEOUT:
	219	{
	220	int new_timeout;
	221	if (get_user(new_timeout, p))
	222	return -EFAULT;
	223	if (ali_settimer(new_timeout))
	224	return -EINVAL;
	225	ali_keepalive();
	226	/* Fall */
	227	}
	228	case WDIOC_GETTIMEOUT:
	229	return put_user(timeout, p);
	230	default:
	231	return -ENOTTY;
1da177e4 LT	232	}
	233	}
	234
	235	/*
	236	* ali_open - handle open of ali watchdog
	237	* @inode: inode from VFS
	238	* @file: file from VFS
	239	*
	240	* Open the ALi watchdog device. Ensure only one person opens it
	241	* at a time. Also start the watchdog running.
	242	*/
	243
	244	static int ali_open(struct inode inode, struct file file)
	245	{
	246	/* /dev/watchdog can only be opened once */
	247	if (test_and_set_bit(0, &ali_is_open))
	248	return -EBUSY;
	249
	250	/* Activate */
	251	ali_start();
	252	return nonseekable_open(inode, file);
	253	}
	254
	255	/*
	256	* ali_release - close an ALi watchdog
	257	* @inode: inode from VFS
	258	* @file: file from VFS
	259	*
	260	* Close the ALi watchdog device. Actual shutdown of the timer
	261	* only occurs if the magic sequence has been set.
	262	*/
	263
	264	static int ali_release(struct inode inode, struct file file)
	265	{
	266	/*
	267	* Shut off the timer.
	268	*/
173d95bc	269	if (ali_expect_release == 42)
1da177e4	270	ali_stop();
173d95bc	271	else {
27c766aa	272	pr_crit("Unexpected close, not stopping watchdog!\n");
1da177e4 LT	273	ali_keepalive();
	274	}
	275	clear_bit(0, &ali_is_open);
	276	ali_expect_release = 0;
	277	return 0;
	278	}
	279
	280	/*
	281	* ali_notify_sys - System down notifier
	282	*
	283	* Notifier for system down
	284	*/
	285
	286
173d95bc AC	287	static int ali_notify_sys(struct notifier_block *this,
173d95bc AC	288	unsigned long code, void *unused)
1da177e4	289	{
173d95bc AC	290	if (code == SYS_DOWN \|\| code == SYS_HALT)
173d95bc AC	291	ali_stop(); /* Turn the WDT off */
1da177e4 LT	292	return NOTIFY_DONE;
	293	}
	294
	295	/*
	296	* Data for PCI driver interface
	297	*
	298	* This data only exists for exporting the supported
	299	* PCI ids via MODULE_DEVICE_TABLE. We do not actually
	300	* register a pci_driver, because someone else might one day
	301	* want to register another driver on the same PCI id.
	302	*/
	303
4562f539	304	static DEFINE_PCI_DEVICE_TABLE(ali_pci_tbl) __used = {
6e420b7e	305	{ PCI_VENDOR_ID_AL, 0x1533, PCI_ANY_ID, PCI_ANY_ID,},
b7343f01	306	{ PCI_VENDOR_ID_AL, 0x1535, PCI_ANY_ID, PCI_ANY_ID,},
1da177e4 LT	307	{ 0, },
	308	};
	309	MODULE_DEVICE_TABLE(pci, ali_pci_tbl);
	310
	311	/*
	312	* ali_find_watchdog - find a 1535 and 7101
	313	*
	314	* Scans the PCI hardware for a 1535 series bridge and matching 7101
	315	* watchdog device. This may be overtight but it is better to be safe
	316	*/
	317
	318	static int __init ali_find_watchdog(void)
	319	{
	320	struct pci_dev *pdev;
	321	u32 wdog;
	322
6e420b7e	323	/* Check for a 1533/1535 series bridge */
02be2ee9	324	pdev = pci_get_device(PCI_VENDOR_ID_AL, 0x1535, NULL);
6e420b7e AB	325	if (pdev == NULL)
	326	pdev = pci_get_device(PCI_VENDOR_ID_AL, 0x1533, NULL);
	327	if (pdev == NULL)
1da177e4	328	return -ENODEV;
02be2ee9	329	pci_dev_put(pdev);
1da177e4 LT	330
1da177e4 LT	331	/* Check for the a 7101 PMU */
02be2ee9	332	pdev = pci_get_device(PCI_VENDOR_ID_AL, 0x7101, NULL);
173d95bc	333	if (pdev == NULL)
1da177e4 LT	334	return -ENODEV;
1da177e4 LT	335
173d95bc	336	if (pci_enable_device(pdev)) {
02be2ee9	337	pci_dev_put(pdev);
1da177e4	338	return -EIO;
02be2ee9	339	}
1da177e4 LT	340
	341	ali_pci = pdev;
	342
	343	/*
	344	* Initialize the timer bits
	345	*/
	346	pci_read_config_dword(pdev, 0xCC, &wdog);
	347
173d95bc AC	348	/* Timer bits */
	349	wdog &= ~0x3F;
	350	/* Issued events */
143a2e54	351	wdog &= ~((1 << 27)\|(1 << 26)\|(1 << 25)\|(1 << 24));
173d95bc	352	/* No monitor bits */
143a2e54	353	wdog &= ~((1 << 16)\|(1 << 13)\|(1 << 12)\|(1 << 11)\|(1 << 10)\|(1 << 9));
1da177e4 LT	354
	355	pci_write_config_dword(pdev, 0xCC, wdog);
	356
	357	return 0;
	358	}
	359
	360	/*
	361	* Kernel Interfaces
	362	*/
	363
62322d25	364	static const struct file_operations ali_fops = {
5f3b2756 WVS	365	.owner = THIS_MODULE,
5f3b2756 WVS	366	.llseek = no_llseek,
173d95bc AC	367	.write = ali_write,
173d95bc AC	368	.unlocked_ioctl = ali_ioctl,
5f3b2756 WVS	369	.open = ali_open,
5f3b2756 WVS	370	.release = ali_release,
1da177e4 LT	371	};
	372
	373	static struct miscdevice ali_miscdev = {
	374	.minor = WATCHDOG_MINOR,
	375	.name = "watchdog",
	376	.fops = &ali_fops,
	377	};
	378
	379	static struct notifier_block ali_notifier = {
	380	.notifier_call = ali_notify_sys,
	381	};
	382
	383	/*
	384	* watchdog_init - module initialiser
	385	*
	386	* Scan for a suitable watchdog and if so initialize it. Return an error
	387	* if we cannot, the error causes the module to unload
	388	*/
	389
	390	static int __init watchdog_init(void)
	391	{
	392	int ret;
	393
1da177e4	394	/* Check whether or not the hardware watchdog is there */
173d95bc	395	if (ali_find_watchdog() != 0)
1da177e4	396	return -ENODEV;
1da177e4	397
173d95bc AC	398	/* Check that the timeout value is within it's range;
173d95bc AC	399	if not reset to the default */
1da177e4 LT	400	if (timeout < 1 \|\| timeout >= 18000) {
1da177e4 LT	401	timeout = WATCHDOG_TIMEOUT;
27c766aa JP	402	pr_info("timeout value must be 0 < timeout < 18000, using %d\n",
27c766aa JP	403	timeout);
1da177e4 LT	404	}
	405
	406	/* Calculate the watchdog's timeout */
	407	ali_settimer(timeout);
	408
c6cb13ae	409	ret = register_reboot_notifier(&ali_notifier);
1da177e4	410	if (ret != 0) {
27c766aa	411	pr_err("cannot register reboot notifier (err=%d)\n", ret);
1da177e4 LT	412	goto out;
	413	}
	414
c6cb13ae	415	ret = misc_register(&ali_miscdev);
1da177e4	416	if (ret != 0) {
27c766aa JP	417	pr_err("cannot register miscdev on minor=%d (err=%d)\n",
27c766aa JP	418	WATCHDOG_MINOR, ret);
c6cb13ae	419	goto unreg_reboot;
1da177e4 LT	420	}
1da177e4 LT	421
27c766aa	422	pr_info("initialized. timeout=%d sec (nowayout=%d)\n",
1da177e4 LT	423	timeout, nowayout);
	424
	425	out:
	426	return ret;
c6cb13ae WVS	427	unreg_reboot:
c6cb13ae WVS	428	unregister_reboot_notifier(&ali_notifier);
1da177e4 LT	429	goto out;
	430	}
	431
	432	/*
	433	* watchdog_exit - module de-initialiser
	434	*
	435	* Called while unloading a successfully installed watchdog module.
	436	*/
	437
	438	static void __exit watchdog_exit(void)
	439	{
	440	/* Stop the timer before we leave */
	441	ali_stop();
	442
	443	/* Deregister */
1da177e4	444	misc_deregister(&ali_miscdev);
c6cb13ae	445	unregister_reboot_notifier(&ali_notifier);
02be2ee9	446	pci_dev_put(ali_pci);
1da177e4 LT	447	}
	448
	449	module_init(watchdog_init);
	450	module_exit(watchdog_exit);
	451
	452	MODULE_AUTHOR("Alan Cox");
	453	MODULE_DESCRIPTION("ALi M1535 PMU Watchdog Timer driver");
	454	MODULE_LICENSE("GPL");
	455	MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);