[deliverable/linux.git] / drivers / watchdog / mpc8xxx_wdt.c

/*
 * mpc8xxx_wdt.c - MPC8xx/MPC83xx/MPC86xx watchdog userspace interface
 *
 * Authors: Dave Updegraff <dave@cray.org>
 *	    Kumar Gala <galak@kernel.crashing.org>
 *		Attribution: from 83xx_wst: Florian Schirmer <jolt@tuxbox.org>
 *				..and from sc520_wdt
 * Copyright (c) 2008  MontaVista Software, Inc.
 *                     Anton Vorontsov <avorontsov@ru.mvista.com>
 *
 * Note: it appears that you can only actually ENABLE or DISABLE the thing
 * once after POR. Once enabled, you cannot disable, and vice versa.
 *
 * 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.
 */

#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/miscdevice.h>
#include <linux/of_platform.h>
#include <linux/module.h>
#include <linux/watchdog.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <sysdev/fsl_soc.h>

struct mpc8xxx_wdt {
	__be32 res0;
	__be32 swcrr; /* System watchdog control register */
#define SWCRR_SWTC 0xFFFF0000 /* Software Watchdog Time Count. */
#define SWCRR_SWEN 0x00000004 /* Watchdog Enable bit. */
#define SWCRR_SWRI 0x00000002 /* Software Watchdog Reset/Interrupt Select bit.*/
#define SWCRR_SWPR 0x00000001 /* Software Watchdog Counter Prescale bit. */
	__be32 swcnr; /* System watchdog count register */
	u8 res1[2];
	__be16 swsrr; /* System watchdog service register */
	u8 res2[0xF0];
};

struct mpc8xxx_wdt_type {
	int prescaler;
	bool hw_enabled;
};

static struct mpc8xxx_wdt __iomem *wd_base;
static int mpc8xxx_wdt_init_late(void);

static u16 timeout = 0xffff;
module_param(timeout, ushort, 0);
MODULE_PARM_DESC(timeout,
	"Watchdog timeout in ticks. (0<timeout<65536, default=65535)");

static int reset = 1;
module_param(reset, bool, 0);
MODULE_PARM_DESC(reset,
	"Watchdog Interrupt/Reset Mode. 0 = interrupt, 1 = reset");

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) ")");

/*
 * We always prescale, but if someone really doesn't want to they can set this
 * to 0
 */
static int prescale = 1;
static unsigned int timeout_sec;

static unsigned long wdt_is_open;
static DEFINE_SPINLOCK(wdt_spinlock);

static void mpc8xxx_wdt_keepalive(void)
{
	/* Ping the WDT */
	spin_lock(&wdt_spinlock);
	out_be16(&wd_base->swsrr, 0x556c);
	out_be16(&wd_base->swsrr, 0xaa39);
	spin_unlock(&wdt_spinlock);
}

static void mpc8xxx_wdt_timer_ping(unsigned long arg);
static DEFINE_TIMER(wdt_timer, mpc8xxx_wdt_timer_ping, 0, 0);

static void mpc8xxx_wdt_timer_ping(unsigned long arg)
{
	mpc8xxx_wdt_keepalive();
	/* We're pinging it twice faster than needed, just to be sure. */
	mod_timer(&wdt_timer, jiffies + HZ * timeout_sec / 2);
}

static void mpc8xxx_wdt_pr_warn(const char *msg)
{
	pr_crit("mpc8xxx_wdt: %s, expect the %s soon!\n", msg,
		reset ? "reset" : "machine check exception");
}

static ssize_t mpc8xxx_wdt_write(struct file *file, const char __user *buf,
				 size_t count, loff_t *ppos)
{
	if (count)
		mpc8xxx_wdt_keepalive();
	return count;
}

static int mpc8xxx_wdt_open(struct inode *inode, struct file *file)
{
	u32 tmp = SWCRR_SWEN;
	if (test_and_set_bit(0, &wdt_is_open))
		return -EBUSY;

	/* Once we start the watchdog we can't stop it */
	if (nowayout)
		__module_get(THIS_MODULE);

	/* Good, fire up the show */
	if (prescale)
		tmp |= SWCRR_SWPR;
	if (reset)
		tmp |= SWCRR_SWRI;

	tmp |= timeout << 16;

	out_be32(&wd_base->swcrr, tmp);

	del_timer_sync(&wdt_timer);

	return nonseekable_open(inode, file);
}

static int mpc8xxx_wdt_release(struct inode *inode, struct file *file)
{
	if (!nowayout)
		mpc8xxx_wdt_timer_ping(0);
	else
		mpc8xxx_wdt_pr_warn("watchdog closed");
	clear_bit(0, &wdt_is_open);
	return 0;
}

static long mpc8xxx_wdt_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,
		.firmware_version = 1,
		.identity = "MPC8xxx",
	};

	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_KEEPALIVE:
		mpc8xxx_wdt_keepalive();
		return 0;
	case WDIOC_GETTIMEOUT:
		return put_user(timeout_sec, p);
	default:
		return -ENOTTY;
	}
}

static const struct file_operations mpc8xxx_wdt_fops = {
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.write		= mpc8xxx_wdt_write,
	.unlocked_ioctl	= mpc8xxx_wdt_ioctl,
	.open		= mpc8xxx_wdt_open,
	.release	= mpc8xxx_wdt_release,
};

static struct miscdevice mpc8xxx_wdt_miscdev = {
	.minor	= WATCHDOG_MINOR,
	.name	= "watchdog",
	.fops	= &mpc8xxx_wdt_fops,
};

static int __devinit mpc8xxx_wdt_probe(struct platform_device *ofdev)
{
	int ret;
	struct device_node *np = ofdev->dev.of_node;
	struct mpc8xxx_wdt_type *wdt_type;
	u32 freq = fsl_get_sys_freq();
	bool enabled;

	if (!ofdev->dev.of_match)
		return -EINVAL;
	wdt_type = match->data;

	if (!freq || freq == -1)
		return -EINVAL;

	wd_base = of_iomap(np, 0);
	if (!wd_base)
		return -ENOMEM;

	enabled = in_be32(&wd_base->swcrr) & SWCRR_SWEN;
	if (!enabled && wdt_type->hw_enabled) {
		pr_info("mpc8xxx_wdt: could not be enabled in software\n");
		ret = -ENOSYS;
		goto err_unmap;
	}

	/* Calculate the timeout in seconds */
	if (prescale)
		timeout_sec = (timeout * wdt_type->prescaler) / freq;
	else
		timeout_sec = timeout / freq;

#ifdef MODULE
	ret = mpc8xxx_wdt_init_late();
	if (ret)
		goto err_unmap;
#endif

	pr_info("WDT driver for MPC8xxx initialized. mode:%s timeout=%d "
		"(%d seconds)\n", reset ? "reset" : "interrupt", timeout,
		timeout_sec);

	/*
	 * If the watchdog was previously enabled or we're running on
	 * MPC8xxx, we should ping the wdt from the kernel until the
	 * userspace handles it.
	 */
	if (enabled)
		mpc8xxx_wdt_timer_ping(0);
	return 0;
err_unmap:
	iounmap(wd_base);
	wd_base = NULL;
	return ret;
}

static int __devexit mpc8xxx_wdt_remove(struct platform_device *ofdev)
{
	mpc8xxx_wdt_pr_warn("watchdog removed");
	del_timer_sync(&wdt_timer);
	misc_deregister(&mpc8xxx_wdt_miscdev);
	iounmap(wd_base);

	return 0;
}

static const struct of_device_id mpc8xxx_wdt_match[] = {
	{
		.compatible = "mpc83xx_wdt",
		.data = &(struct mpc8xxx_wdt_type) {
			.prescaler = 0x10000,
		},
	},
	{
		.compatible = "fsl,mpc8610-wdt",
		.data = &(struct mpc8xxx_wdt_type) {
			.prescaler = 0x10000,
			.hw_enabled = true,
		},
	},
	{
		.compatible = "fsl,mpc823-wdt",
		.data = &(struct mpc8xxx_wdt_type) {
			.prescaler = 0x800,
		},
	},
	{},
};
MODULE_DEVICE_TABLE(of, mpc8xxx_wdt_match);

static struct platform_driver mpc8xxx_wdt_driver = {
	.probe		= mpc8xxx_wdt_probe,
	.remove		= __devexit_p(mpc8xxx_wdt_remove),
	.driver = {
		.name = "mpc8xxx_wdt",
		.owner = THIS_MODULE,
		.of_match_table = mpc8xxx_wdt_match,
	},
};

/*
 * We do wdt initialization in two steps: arch_initcall probes the wdt
 * very early to start pinging the watchdog (misc devices are not yet
 * available), and later module_init() just registers the misc device.
 */
static int mpc8xxx_wdt_init_late(void)
{
	int ret;

	if (!wd_base)
		return -ENODEV;

	ret = misc_register(&mpc8xxx_wdt_miscdev);
	if (ret) {
		pr_err("cannot register miscdev on minor=%d (err=%d)\n",
			WATCHDOG_MINOR, ret);
		return ret;
	}
	return 0;
}
#ifndef MODULE
module_init(mpc8xxx_wdt_init_late);
#endif

static int __init mpc8xxx_wdt_init(void)
{
	return platform_driver_register(&mpc8xxx_wdt_driver);
}
arch_initcall(mpc8xxx_wdt_init);

static void __exit mpc8xxx_wdt_exit(void)
{
	platform_driver_unregister(&mpc8xxx_wdt_driver);
}
module_exit(mpc8xxx_wdt_exit);

MODULE_AUTHOR("Dave Updegraff, Kumar Gala");
MODULE_DESCRIPTION("Driver for watchdog timer in MPC8xx/MPC83xx/MPC86xx "
		   "uProcessors");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
Commit	Line	Data
fabbfb9e	1	/*
0d7b1014	2	* mpc8xxx_wdt.c - MPC8xx/MPC83xx/MPC86xx watchdog userspace interface
fabbfb9e KG	3	*
fabbfb9e KG	4	* Authors: Dave Updegraff <dave@cray.org>
5f3b2756 WVS	5	* Kumar Gala <galak@kernel.crashing.org>
	6	* Attribution: from 83xx_wst: Florian Schirmer <jolt@tuxbox.org>
	7	* ..and from sc520_wdt
500c919e AV	8	* Copyright (c) 2008 MontaVista Software, Inc.
500c919e AV	9	* Anton Vorontsov <avorontsov@ru.mvista.com>
fabbfb9e KG	10	*
	11	* Note: it appears that you can only actually ENABLE or DISABLE the thing
	12	* once after POR. Once enabled, you cannot disable, and vice versa.
	13	*
	14	* This program is free software; you can redistribute it and/or modify it
	15	* under the terms of the GNU General Public License as published by the
	16	* Free Software Foundation; either version 2 of the License, or (at your
	17	* option) any later version.
	18	*/
	19
fabbfb9e KG	20	#include <linux/fs.h>
	21	#include <linux/init.h>
	22	#include <linux/kernel.h>
500c919e	23	#include <linux/timer.h>
fabbfb9e	24	#include <linux/miscdevice.h>
ef8ab12e	25	#include <linux/of_platform.h>
fabbfb9e KG	26	#include <linux/module.h>
fabbfb9e KG	27	#include <linux/watchdog.h>
f26ef3dc AC	28	#include <linux/io.h>
f26ef3dc AC	29	#include <linux/uaccess.h>
ef8ab12e	30	#include <sysdev/fsl_soc.h>
fabbfb9e	31
59ca1b0d	32	struct mpc8xxx_wdt {
fabbfb9e KG	33	__be32 res0;
	34	__be32 swcrr; /* System watchdog control register */
	35	#define SWCRR_SWTC 0xFFFF0000 /* Software Watchdog Time Count. */
	36	#define SWCRR_SWEN 0x00000004 /* Watchdog Enable bit. */
	37	#define SWCRR_SWRI 0x00000002 /* Software Watchdog Reset/Interrupt Select bit.*/
	38	#define SWCRR_SWPR 0x00000001 /* Software Watchdog Counter Prescale bit. */
	39	__be32 swcnr; /* System watchdog count register */
	40	u8 res1[2];
	41	__be16 swsrr; /* System watchdog service register */
	42	u8 res2[0xF0];
	43	};
	44
59ca1b0d	45	struct mpc8xxx_wdt_type {
500c919e AV	46	int prescaler;
	47	bool hw_enabled;
	48	};
	49
59ca1b0d	50	static struct mpc8xxx_wdt __iomem *wd_base;
593fc178	51	static int mpc8xxx_wdt_init_late(void);
fabbfb9e KG	52
	53	static u16 timeout = 0xffff;
	54	module_param(timeout, ushort, 0);
f26ef3dc	55	MODULE_PARM_DESC(timeout,
76550d32	56	"Watchdog timeout in ticks. (0<timeout<65536, default=65535)");
fabbfb9e KG	57
	58	static int reset = 1;
	59	module_param(reset, bool, 0);
f26ef3dc AC	60	MODULE_PARM_DESC(reset,
f26ef3dc AC	61	"Watchdog Interrupt/Reset Mode. 0 = interrupt, 1 = reset");
fabbfb9e	62
500c919e AV	63	static int nowayout = WATCHDOG_NOWAYOUT;
	64	module_param(nowayout, int, 0);
	65	MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
	66	"(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
	67
fabbfb9e KG	68	/*
	69	* We always prescale, but if someone really doesn't want to they can set this
	70	* to 0
	71	*/
	72	static int prescale = 1;
	73	static unsigned int timeout_sec;
	74
	75	static unsigned long wdt_is_open;
c7dfd0cc	76	static DEFINE_SPINLOCK(wdt_spinlock);
fabbfb9e	77
59ca1b0d	78	static void mpc8xxx_wdt_keepalive(void)
fabbfb9e KG	79	{
	80	/* Ping the WDT */
	81	spin_lock(&wdt_spinlock);
	82	out_be16(&wd_base->swsrr, 0x556c);
	83	out_be16(&wd_base->swsrr, 0xaa39);
	84	spin_unlock(&wdt_spinlock);
	85	}
	86
59ca1b0d AV	87	static void mpc8xxx_wdt_timer_ping(unsigned long arg);
59ca1b0d AV	88	static DEFINE_TIMER(wdt_timer, mpc8xxx_wdt_timer_ping, 0, 0);
500c919e	89
59ca1b0d	90	static void mpc8xxx_wdt_timer_ping(unsigned long arg)
500c919e	91	{
59ca1b0d	92	mpc8xxx_wdt_keepalive();
500c919e AV	93	/* We're pinging it twice faster than needed, just to be sure. */
	94	mod_timer(&wdt_timer, jiffies + HZ * timeout_sec / 2);
	95	}
	96
59ca1b0d	97	static void mpc8xxx_wdt_pr_warn(const char *msg)
500c919e	98	{
59ca1b0d	99	pr_crit("mpc8xxx_wdt: %s, expect the %s soon!\n", msg,
500c919e AV	100	reset ? "reset" : "machine check exception");
	101	}
	102
59ca1b0d	103	static ssize_t mpc8xxx_wdt_write(struct file file, const char __user buf,
fabbfb9e KG	104	size_t count, loff_t *ppos)
	105	{
	106	if (count)
59ca1b0d	107	mpc8xxx_wdt_keepalive();
fabbfb9e KG	108	return count;
	109	}
	110
59ca1b0d	111	static int mpc8xxx_wdt_open(struct inode inode, struct file file)
fabbfb9e KG	112	{
	113	u32 tmp = SWCRR_SWEN;
	114	if (test_and_set_bit(0, &wdt_is_open))
	115	return -EBUSY;
	116
	117	/* Once we start the watchdog we can't stop it */
500c919e AV	118	if (nowayout)
500c919e AV	119	__module_get(THIS_MODULE);
fabbfb9e KG	120
	121	/* Good, fire up the show */
	122	if (prescale)
	123	tmp \|= SWCRR_SWPR;
	124	if (reset)
	125	tmp \|= SWCRR_SWRI;
	126
	127	tmp \|= timeout << 16;
	128
	129	out_be32(&wd_base->swcrr, tmp);
	130
500c919e AV	131	del_timer_sync(&wdt_timer);
500c919e AV	132
fabbfb9e KG	133	return nonseekable_open(inode, file);
	134	}
	135
59ca1b0d	136	static int mpc8xxx_wdt_release(struct inode inode, struct file file)
fabbfb9e	137	{
500c919e	138	if (!nowayout)
59ca1b0d	139	mpc8xxx_wdt_timer_ping(0);
500c919e	140	else
59ca1b0d	141	mpc8xxx_wdt_pr_warn("watchdog closed");
fabbfb9e KG	142	clear_bit(0, &wdt_is_open);
	143	return 0;
	144	}
	145
cb55d282	146	static long mpc8xxx_wdt_ioctl(struct file *file, unsigned int cmd,
f26ef3dc	147	unsigned long arg)
fabbfb9e KG	148	{
	149	void __user argp = (void __user )arg;
	150	int __user *p = argp;
42747d71	151	static const struct watchdog_info ident = {
fabbfb9e KG	152	.options = WDIOF_KEEPALIVEPING,
fabbfb9e KG	153	.firmware_version = 1,
59ca1b0d	154	.identity = "MPC8xxx",
fabbfb9e KG	155	};
	156
	157	switch (cmd) {
	158	case WDIOC_GETSUPPORT:
	159	return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
5c4eb61b WVS	160	case WDIOC_GETSTATUS:
	161	case WDIOC_GETBOOTSTATUS:
	162	return put_user(0, p);
fabbfb9e	163	case WDIOC_KEEPALIVE:
59ca1b0d	164	mpc8xxx_wdt_keepalive();
fabbfb9e KG	165	return 0;
	166	case WDIOC_GETTIMEOUT:
	167	return put_user(timeout_sec, p);
	168	default:
795b89d2	169	return -ENOTTY;
fabbfb9e KG	170	}
	171	}
	172
59ca1b0d	173	static const struct file_operations mpc8xxx_wdt_fops = {
fabbfb9e KG	174	.owner = THIS_MODULE,
fabbfb9e KG	175	.llseek = no_llseek,
59ca1b0d AV	176	.write = mpc8xxx_wdt_write,
	177	.unlocked_ioctl = mpc8xxx_wdt_ioctl,
	178	.open = mpc8xxx_wdt_open,
	179	.release = mpc8xxx_wdt_release,
fabbfb9e KG	180	};
fabbfb9e KG	181
59ca1b0d	182	static struct miscdevice mpc8xxx_wdt_miscdev = {
fabbfb9e KG	183	.minor = WATCHDOG_MINOR,
fabbfb9e KG	184	.name = "watchdog",
59ca1b0d	185	.fops = &mpc8xxx_wdt_fops,
fabbfb9e KG	186	};
fabbfb9e KG	187
1c48a5c9	188	static int __devinit mpc8xxx_wdt_probe(struct platform_device *ofdev)
fabbfb9e	189	{
fabbfb9e	190	int ret;
de2b606c	191	struct device_node *np = ofdev->dev.of_node;
1c48a5c9	192	struct mpc8xxx_wdt_type *wdt_type;
ef8ab12e	193	u32 freq = fsl_get_sys_freq();
500c919e	194	bool enabled;
fabbfb9e	195
1c48a5c9 GL	196	if (!ofdev->dev.of_match)
	197	return -EINVAL;
	198	wdt_type = match->data;
	199
ef8ab12e AV	200	if (!freq \|\| freq == -1)
ef8ab12e AV	201	return -EINVAL;
fabbfb9e	202
500c919e	203	wd_base = of_iomap(np, 0);
ef8ab12e AV	204	if (!wd_base)
ef8ab12e AV	205	return -ENOMEM;
fabbfb9e	206
500c919e AV	207	enabled = in_be32(&wd_base->swcrr) & SWCRR_SWEN;
500c919e AV	208	if (!enabled && wdt_type->hw_enabled) {
59ca1b0d	209	pr_info("mpc8xxx_wdt: could not be enabled in software\n");
500c919e AV	210	ret = -ENOSYS;
	211	goto err_unmap;
	212	}
	213
fabbfb9e KG	214	/* Calculate the timeout in seconds */
fabbfb9e KG	215	if (prescale)
500c919e	216	timeout_sec = (timeout * wdt_type->prescaler) / freq;
fabbfb9e	217	else
ef8ab12e	218	timeout_sec = timeout / freq;
fabbfb9e	219
593fc178 AV	220	#ifdef MODULE
	221	ret = mpc8xxx_wdt_init_late();
	222	if (ret)
	223	goto err_unmap;
	224	#endif
	225
59ca1b0d	226	pr_info("WDT driver for MPC8xxx initialized. mode:%s timeout=%d "
ef8ab12e AV	227	"(%d seconds)\n", reset ? "reset" : "interrupt", timeout,
ef8ab12e AV	228	timeout_sec);
500c919e AV	229
	230	/*
	231	* If the watchdog was previously enabled or we're running on
59ca1b0d	232	* MPC8xxx, we should ping the wdt from the kernel until the
500c919e AV	233	* userspace handles it.
	234	*/
	235	if (enabled)
59ca1b0d	236	mpc8xxx_wdt_timer_ping(0);
fabbfb9e	237	return 0;
fabbfb9e KG	238	err_unmap:
fabbfb9e KG	239	iounmap(wd_base);
0d7b1014	240	wd_base = NULL;
fabbfb9e KG	241	return ret;
	242	}
	243
2dc11581	244	static int __devexit mpc8xxx_wdt_remove(struct platform_device *ofdev)
fabbfb9e	245	{
59ca1b0d	246	mpc8xxx_wdt_pr_warn("watchdog removed");
500c919e	247	del_timer_sync(&wdt_timer);
59ca1b0d	248	misc_deregister(&mpc8xxx_wdt_miscdev);
fabbfb9e KG	249	iounmap(wd_base);
	250
	251	return 0;
	252	}
	253
59ca1b0d	254	static const struct of_device_id mpc8xxx_wdt_match[] = {
ef8ab12e AV	255	{
ef8ab12e AV	256	.compatible = "mpc83xx_wdt",
59ca1b0d	257	.data = &(struct mpc8xxx_wdt_type) {
500c919e AV	258	.prescaler = 0x10000,
	259	},
	260	},
	261	{
	262	.compatible = "fsl,mpc8610-wdt",
59ca1b0d	263	.data = &(struct mpc8xxx_wdt_type) {
500c919e AV	264	.prescaler = 0x10000,
	265	.hw_enabled = true,
	266	},
ef8ab12e	267	},
0d7b1014 AV	268	{
	269	.compatible = "fsl,mpc823-wdt",
	270	.data = &(struct mpc8xxx_wdt_type) {
	271	.prescaler = 0x800,
	272	},
	273	},
ef8ab12e AV	274	{},
ef8ab12e AV	275	};
59ca1b0d	276	MODULE_DEVICE_TABLE(of, mpc8xxx_wdt_match);
ef8ab12e	277
1c48a5c9	278	static struct platform_driver mpc8xxx_wdt_driver = {
59ca1b0d AV	279	.probe = mpc8xxx_wdt_probe,
59ca1b0d AV	280	.remove = __devexit_p(mpc8xxx_wdt_remove),
4018294b GL	281	.driver = {
	282	.name = "mpc8xxx_wdt",
	283	.owner = THIS_MODULE,
	284	.of_match_table = mpc8xxx_wdt_match,
fabbfb9e KG	285	},
	286	};
	287
0d7b1014 AV	288	/*
	289	* We do wdt initialization in two steps: arch_initcall probes the wdt
	290	* very early to start pinging the watchdog (misc devices are not yet
	291	* available), and later module_init() just registers the misc device.
	292	*/
593fc178	293	static int mpc8xxx_wdt_init_late(void)
0d7b1014 AV	294	{
	295	int ret;
	296
	297	if (!wd_base)
	298	return -ENODEV;
	299
	300	ret = misc_register(&mpc8xxx_wdt_miscdev);
	301	if (ret) {
	302	pr_err("cannot register miscdev on minor=%d (err=%d)\n",
	303	WATCHDOG_MINOR, ret);
	304	return ret;
	305	}
	306	return 0;
	307	}
593fc178	308	#ifndef MODULE
0d7b1014	309	module_init(mpc8xxx_wdt_init_late);
593fc178	310	#endif
0d7b1014	311
59ca1b0d	312	static int __init mpc8xxx_wdt_init(void)
fabbfb9e	313	{
1c48a5c9	314	return platform_driver_register(&mpc8xxx_wdt_driver);
fabbfb9e	315	}
0d7b1014	316	arch_initcall(mpc8xxx_wdt_init);
fabbfb9e	317
59ca1b0d	318	static void __exit mpc8xxx_wdt_exit(void)
fabbfb9e	319	{
1c48a5c9	320	platform_driver_unregister(&mpc8xxx_wdt_driver);
fabbfb9e	321	}
59ca1b0d	322	module_exit(mpc8xxx_wdt_exit);
fabbfb9e KG	323
fabbfb9e KG	324	MODULE_AUTHOR("Dave Updegraff, Kumar Gala");
0d7b1014 AV	325	MODULE_DESCRIPTION("Driver for watchdog timer in MPC8xx/MPC83xx/MPC86xx "
0d7b1014 AV	326	"uProcessors");
fabbfb9e KG	327	MODULE_LICENSE("GPL");
fabbfb9e KG	328	MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);