[net-next-2.6.git] / drivers / watchdog / ar7_wdt.c

/*
 * drivers/watchdog/ar7_wdt.c
 *
 * Copyright (C) 2007 Nicolas Thill <nico@openwrt.org>
 * Copyright (c) 2005 Enrik Berkhan <Enrik.Berkhan@akk.org>
 *
 * Some code taken from:
 * National Semiconductor SCx200 Watchdog support
 * Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

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

#include <asm/addrspace.h>
#include <asm/mach-ar7/ar7.h>

#define DRVNAME "ar7_wdt"
#define LONGNAME "TI AR7 Watchdog Timer"

MODULE_AUTHOR("Nicolas Thill <nico@openwrt.org>");
MODULE_DESCRIPTION(LONGNAME);
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

static int margin = 60;
module_param(margin, int, 0);
MODULE_PARM_DESC(margin, "Watchdog margin in seconds");

static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");

#define READ_REG(x) readl((void __iomem *)&(x))
#define WRITE_REG(x, v) writel((v), (void __iomem *)&(x))

struct ar7_wdt {
	u32 kick_lock;
	u32 kick;
	u32 change_lock;
	u32 change;
	u32 disable_lock;
	u32 disable;
	u32 prescale_lock;
	u32 prescale;
};

static unsigned long wdt_is_open;
static spinlock_t wdt_lock;
static unsigned expect_close;

/* XXX currently fixed, allows max margin ~68.72 secs */
#define prescale_value 0xffff

/* Resource of the WDT registers */
static struct resource *ar7_regs_wdt;
/* Pointer to the remapped WDT IO space */
static struct ar7_wdt *ar7_wdt;

static void ar7_wdt_kick(u32 value)
{
	WRITE_REG(ar7_wdt->kick_lock, 0x5555);
	if ((READ_REG(ar7_wdt->kick_lock) & 3) == 1) {
		WRITE_REG(ar7_wdt->kick_lock, 0xaaaa);
		if ((READ_REG(ar7_wdt->kick_lock) & 3) == 3) {
			WRITE_REG(ar7_wdt->kick, value);
			return;
		}
	}
	printk(KERN_ERR DRVNAME ": failed to unlock WDT kick reg\n");
}

static void ar7_wdt_prescale(u32 value)
{
	WRITE_REG(ar7_wdt->prescale_lock, 0x5a5a);
	if ((READ_REG(ar7_wdt->prescale_lock) & 3) == 1) {
		WRITE_REG(ar7_wdt->prescale_lock, 0xa5a5);
		if ((READ_REG(ar7_wdt->prescale_lock) & 3) == 3) {
			WRITE_REG(ar7_wdt->prescale, value);
			return;
		}
	}
	printk(KERN_ERR DRVNAME ": failed to unlock WDT prescale reg\n");
}

static void ar7_wdt_change(u32 value)
{
	WRITE_REG(ar7_wdt->change_lock, 0x6666);
	if ((READ_REG(ar7_wdt->change_lock) & 3) == 1) {
		WRITE_REG(ar7_wdt->change_lock, 0xbbbb);
		if ((READ_REG(ar7_wdt->change_lock) & 3) == 3) {
			WRITE_REG(ar7_wdt->change, value);
			return;
		}
	}
	printk(KERN_ERR DRVNAME ": failed to unlock WDT change reg\n");
}

static void ar7_wdt_disable(u32 value)
{
	WRITE_REG(ar7_wdt->disable_lock, 0x7777);
	if ((READ_REG(ar7_wdt->disable_lock) & 3) == 1) {
		WRITE_REG(ar7_wdt->disable_lock, 0xcccc);
		if ((READ_REG(ar7_wdt->disable_lock) & 3) == 2) {
			WRITE_REG(ar7_wdt->disable_lock, 0xdddd);
			if ((READ_REG(ar7_wdt->disable_lock) & 3) == 3) {
				WRITE_REG(ar7_wdt->disable, value);
				return;
			}
		}
	}
	printk(KERN_ERR DRVNAME ": failed to unlock WDT disable reg\n");
}

static void ar7_wdt_update_margin(int new_margin)
{
	u32 change;

	change = new_margin * (ar7_vbus_freq() / prescale_value);
	if (change < 1)
		change = 1;
	if (change > 0xffff)
		change = 0xffff;
	ar7_wdt_change(change);
	margin = change * prescale_value / ar7_vbus_freq();
	printk(KERN_INFO DRVNAME
	       ": timer margin %d seconds (prescale %d, change %d, freq %d)\n",
	       margin, prescale_value, change, ar7_vbus_freq());
}

static void ar7_wdt_enable_wdt(void)
{
	printk(KERN_DEBUG DRVNAME ": enabling watchdog timer\n");
	ar7_wdt_disable(1);
	ar7_wdt_kick(1);
}

static void ar7_wdt_disable_wdt(void)
{
	printk(KERN_DEBUG DRVNAME ": disabling watchdog timer\n");
	ar7_wdt_disable(0);
}

static int ar7_wdt_open(struct inode *inode, struct file *file)
{
	/* only allow one at a time */
	if (test_and_set_bit(0, &wdt_is_open))
		return -EBUSY;
	ar7_wdt_enable_wdt();
	expect_close = 0;

	return nonseekable_open(inode, file);
}

static int ar7_wdt_release(struct inode *inode, struct file *file)
{
	if (!expect_close)
		printk(KERN_WARNING DRVNAME
		": watchdog device closed unexpectedly,"
		"will not disable the watchdog timer\n");
	else if (!nowayout)
		ar7_wdt_disable_wdt();
	clear_bit(0, &wdt_is_open);
	return 0;
}

static ssize_t ar7_wdt_write(struct file *file, const char *data,
			     size_t len, loff_t *ppos)
{
	/* check for a magic close character */
	if (len) {
		size_t i;

		spin_lock(&wdt_lock);
		ar7_wdt_kick(1);
		spin_unlock(&wdt_lock);

		expect_close = 0;
		for (i = 0; i < len; ++i) {
			char c;
			if (get_user(c, data + i))
				return -EFAULT;
			if (c == 'V')
				expect_close = 1;
		}

	}
	return len;
}

static long ar7_wdt_ioctl(struct file *file,
					unsigned int cmd, unsigned long arg)
{
	static struct watchdog_info ident = {
		.identity = LONGNAME,
		.firmware_version = 1,
		.options = (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
						WDIOF_MAGICCLOSE),
	};
	int new_margin;

	switch (cmd) {
	case WDIOC_GETSUPPORT:
		if (copy_to_user((struct watchdog_info *)arg, &ident,
				sizeof(ident)))
			return -EFAULT;
		return 0;
	case WDIOC_GETSTATUS:
	case WDIOC_GETBOOTSTATUS:
		if (put_user(0, (int *)arg))
			return -EFAULT;
		return 0;
	case WDIOC_KEEPALIVE:
		ar7_wdt_kick(1);
		return 0;
	case WDIOC_SETTIMEOUT:
		if (get_user(new_margin, (int *)arg))
			return -EFAULT;
		if (new_margin < 1)
			return -EINVAL;

		spin_lock(&wdt_lock);
		ar7_wdt_update_margin(new_margin);
		ar7_wdt_kick(1);
		spin_unlock(&wdt_lock);

	case WDIOC_GETTIMEOUT:
		if (put_user(margin, (int *)arg))
			return -EFAULT;
		return 0;
	default:
		return -ENOTTY;
	}
}

static const struct file_operations ar7_wdt_fops = {
	.owner		= THIS_MODULE,
	.write		= ar7_wdt_write,
	.unlocked_ioctl	= ar7_wdt_ioctl,
	.open		= ar7_wdt_open,
	.release	= ar7_wdt_release,
};

static struct miscdevice ar7_wdt_miscdev = {
	.minor		= WATCHDOG_MINOR,
	.name		= "watchdog",
	.fops		= &ar7_wdt_fops,
};

static int __devinit ar7_wdt_probe(struct platform_device *pdev)
{
	int rc;

	spin_lock_init(&wdt_lock);

	ar7_regs_wdt =
		platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
	if (!ar7_regs_wdt) {
		printk(KERN_ERR DRVNAME ": could not get registers resource\n");
		rc = -ENODEV;
		goto out;
	}

	if (!request_mem_region(ar7_regs_wdt->start,
				resource_size(ar7_regs_wdt), LONGNAME)) {
		printk(KERN_WARNING DRVNAME ": watchdog I/O region busy\n");
		rc = -EBUSY;
		goto out;
	}

	ar7_wdt = ioremap(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
	if (!ar7_wdt) {
		printk(KERN_ERR DRVNAME ": could not ioremap registers\n");
		rc = -ENXIO;
		goto out_mem_region;
	}

	ar7_wdt_disable_wdt();
	ar7_wdt_prescale(prescale_value);
	ar7_wdt_update_margin(margin);

	rc = misc_register(&ar7_wdt_miscdev);
	if (rc) {
		printk(KERN_ERR DRVNAME ": unable to register misc device\n");
		goto out_alloc;
	}
	goto out;

out_alloc:
	iounmap(ar7_wdt);
out_mem_region:
	release_mem_region(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
out:
	return rc;
}

static int __devexit ar7_wdt_remove(struct platform_device *pdev)
{
	misc_deregister(&ar7_wdt_miscdev);
	iounmap(ar7_wdt);
	release_mem_region(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));

	return 0;
}

static void ar7_wdt_shutdown(struct platform_device *pdev)
{
	if (!nowayout)
		ar7_wdt_disable_wdt();
}

static struct platform_driver ar7_wdt_driver = {
	.probe = ar7_wdt_probe,
	.remove = __devexit_p(ar7_wdt_remove),
	.shutdown = ar7_wdt_shutdown,
	.driver = {
		.owner = THIS_MODULE,
		.name = "ar7_wdt",
	},
};

static int __init ar7_wdt_init(void)
{
	return platform_driver_register(&ar7_wdt_driver);
}

static void __exit ar7_wdt_cleanup(void)
{
	platform_driver_unregister(&ar7_wdt_driver);
}

module_init(ar7_wdt_init);
module_exit(ar7_wdt_cleanup);
Commit	Line	Data
c283cf2c MC	1	/*
	2	* drivers/watchdog/ar7_wdt.c
	3	*
	4	* Copyright (C) 2007 Nicolas Thill <nico@openwrt.org>
	5	* Copyright (c) 2005 Enrik Berkhan <Enrik.Berkhan@akk.org>
	6	*
	7	* Some code taken from:
	8	* National Semiconductor SCx200 Watchdog support
	9	* Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or
	14	* (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	24	*/
	25
	26	#include <linux/module.h>
	27	#include <linux/moduleparam.h>
	28	#include <linux/errno.h>
	29	#include <linux/init.h>
	30	#include <linux/miscdevice.h>
64d4062a	31	#include <linux/platform_device.h>
c283cf2c	32	#include <linux/watchdog.h>
c283cf2c MC	33	#include <linux/fs.h>
	34	#include <linux/ioport.h>
	35	#include <linux/io.h>
	36	#include <linux/uaccess.h>
	37
	38	#include <asm/addrspace.h>
c5e7f5a3	39	#include <asm/mach-ar7/ar7.h>
c283cf2c MC	40
	41	#define DRVNAME "ar7_wdt"
	42	#define LONGNAME "TI AR7 Watchdog Timer"
	43
	44	MODULE_AUTHOR("Nicolas Thill <nico@openwrt.org>");
	45	MODULE_DESCRIPTION(LONGNAME);
	46	MODULE_LICENSE("GPL");
	47	MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
	48
	49	static int margin = 60;
	50	module_param(margin, int, 0);
	51	MODULE_PARM_DESC(margin, "Watchdog margin in seconds");
	52
	53	static int nowayout = WATCHDOG_NOWAYOUT;
	54	module_param(nowayout, int, 0);
	55	MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
	56
	57	#define READ_REG(x) readl((void __iomem *)&(x))
	58	#define WRITE_REG(x, v) writel((v), (void __iomem *)&(x))
	59
	60	struct ar7_wdt {
	61	u32 kick_lock;
	62	u32 kick;
	63	u32 change_lock;
	64	u32 change;
	65	u32 disable_lock;
	66	u32 disable;
	67	u32 prescale_lock;
	68	u32 prescale;
	69	};
	70
670d59c0 AC	71	static unsigned long wdt_is_open;
670d59c0 AC	72	static spinlock_t wdt_lock;
c283cf2c MC	73	static unsigned expect_close;
	74
	75	/* XXX currently fixed, allows max margin ~68.72 secs */
	76	#define prescale_value 0xffff
	77
64d4062a FF	78	/* Resource of the WDT registers */
64d4062a FF	79	static struct resource *ar7_regs_wdt;
c283cf2c MC	80	/* Pointer to the remapped WDT IO space */
c283cf2c MC	81	static struct ar7_wdt *ar7_wdt;
c283cf2c MC	82
	83	static void ar7_wdt_kick(u32 value)
	84	{
	85	WRITE_REG(ar7_wdt->kick_lock, 0x5555);
	86	if ((READ_REG(ar7_wdt->kick_lock) & 3) == 1) {
	87	WRITE_REG(ar7_wdt->kick_lock, 0xaaaa);
	88	if ((READ_REG(ar7_wdt->kick_lock) & 3) == 3) {
	89	WRITE_REG(ar7_wdt->kick, value);
	90	return;
	91	}
	92	}
	93	printk(KERN_ERR DRVNAME ": failed to unlock WDT kick reg\n");
	94	}
	95
	96	static void ar7_wdt_prescale(u32 value)
	97	{
	98	WRITE_REG(ar7_wdt->prescale_lock, 0x5a5a);
	99	if ((READ_REG(ar7_wdt->prescale_lock) & 3) == 1) {
	100	WRITE_REG(ar7_wdt->prescale_lock, 0xa5a5);
	101	if ((READ_REG(ar7_wdt->prescale_lock) & 3) == 3) {
	102	WRITE_REG(ar7_wdt->prescale, value);
	103	return;
	104	}
	105	}
	106	printk(KERN_ERR DRVNAME ": failed to unlock WDT prescale reg\n");
	107	}
	108
	109	static void ar7_wdt_change(u32 value)
	110	{
	111	WRITE_REG(ar7_wdt->change_lock, 0x6666);
	112	if ((READ_REG(ar7_wdt->change_lock) & 3) == 1) {
	113	WRITE_REG(ar7_wdt->change_lock, 0xbbbb);
	114	if ((READ_REG(ar7_wdt->change_lock) & 3) == 3) {
	115	WRITE_REG(ar7_wdt->change, value);
	116	return;
	117	}
	118	}
	119	printk(KERN_ERR DRVNAME ": failed to unlock WDT change reg\n");
	120	}
	121
	122	static void ar7_wdt_disable(u32 value)
	123	{
	124	WRITE_REG(ar7_wdt->disable_lock, 0x7777);
	125	if ((READ_REG(ar7_wdt->disable_lock) & 3) == 1) {
	126	WRITE_REG(ar7_wdt->disable_lock, 0xcccc);
	127	if ((READ_REG(ar7_wdt->disable_lock) & 3) == 2) {
	128	WRITE_REG(ar7_wdt->disable_lock, 0xdddd);
	129	if ((READ_REG(ar7_wdt->disable_lock) & 3) == 3) {
	130	WRITE_REG(ar7_wdt->disable, value);
	131	return;
	132	}
	133	}
	134	}
	135	printk(KERN_ERR DRVNAME ": failed to unlock WDT disable reg\n");
	136	}
	137
	138	static void ar7_wdt_update_margin(int new_margin)
	139	{
	140	u32 change;
	141
	142	change = new_margin * (ar7_vbus_freq() / prescale_value);
670d59c0 AC	143	if (change < 1)
	144	change = 1;
	145	if (change > 0xffff)
	146	change = 0xffff;
c283cf2c MC	147	ar7_wdt_change(change);
	148	margin = change * prescale_value / ar7_vbus_freq();
	149	printk(KERN_INFO DRVNAME
	150	": timer margin %d seconds (prescale %d, change %d, freq %d)\n",
	151	margin, prescale_value, change, ar7_vbus_freq());
	152	}
	153
	154	static void ar7_wdt_enable_wdt(void)
	155	{
	156	printk(KERN_DEBUG DRVNAME ": enabling watchdog timer\n");
	157	ar7_wdt_disable(1);
	158	ar7_wdt_kick(1);
	159	}
	160
	161	static void ar7_wdt_disable_wdt(void)
	162	{
	163	printk(KERN_DEBUG DRVNAME ": disabling watchdog timer\n");
	164	ar7_wdt_disable(0);
	165	}
	166
	167	static int ar7_wdt_open(struct inode inode, struct file file)
	168	{
	169	/* only allow one at a time */
670d59c0	170	if (test_and_set_bit(0, &wdt_is_open))
c283cf2c MC	171	return -EBUSY;
	172	ar7_wdt_enable_wdt();
	173	expect_close = 0;
	174
	175	return nonseekable_open(inode, file);
	176	}
	177
	178	static int ar7_wdt_release(struct inode inode, struct file file)
	179	{
	180	if (!expect_close)
	181	printk(KERN_WARNING DRVNAME
	182	": watchdog device closed unexpectedly,"
	183	"will not disable the watchdog timer\n");
	184	else if (!nowayout)
	185	ar7_wdt_disable_wdt();
670d59c0	186	clear_bit(0, &wdt_is_open);
c283cf2c MC	187	return 0;
	188	}
	189
c283cf2c MC	190	static ssize_t ar7_wdt_write(struct file file, const char data,
	191	size_t len, loff_t *ppos)
	192	{
	193	/* check for a magic close character */
	194	if (len) {
	195	size_t i;
	196
670d59c0	197	spin_lock(&wdt_lock);
c283cf2c	198	ar7_wdt_kick(1);
670d59c0	199	spin_unlock(&wdt_lock);
c283cf2c MC	200
	201	expect_close = 0;
	202	for (i = 0; i < len; ++i) {
	203	char c;
7944d3a5	204	if (get_user(c, data + i))
c283cf2c MC	205	return -EFAULT;
	206	if (c == 'V')
	207	expect_close = 1;
	208	}
	209
	210	}
	211	return len;
	212	}
	213
670d59c0 AC	214	static long ar7_wdt_ioctl(struct file *file,
670d59c0 AC	215	unsigned int cmd, unsigned long arg)
c283cf2c MC	216	{
	217	static struct watchdog_info ident = {
	218	.identity = LONGNAME,
	219	.firmware_version = 1,
e73a7802 WVS	220	.options = (WDIOF_SETTIMEOUT \| WDIOF_KEEPALIVEPING \|
e73a7802 WVS	221	WDIOF_MAGICCLOSE),
c283cf2c MC	222	};
	223	int new_margin;
	224
	225	switch (cmd) {
c283cf2c MC	226	case WDIOC_GETSUPPORT:
	227	if (copy_to_user((struct watchdog_info *)arg, &ident,
	228	sizeof(ident)))
	229	return -EFAULT;
	230	return 0;
	231	case WDIOC_GETSTATUS:
	232	case WDIOC_GETBOOTSTATUS:
	233	if (put_user(0, (int *)arg))
	234	return -EFAULT;
	235	return 0;
	236	case WDIOC_KEEPALIVE:
	237	ar7_wdt_kick(1);
	238	return 0;
	239	case WDIOC_SETTIMEOUT:
	240	if (get_user(new_margin, (int *)arg))
	241	return -EFAULT;
	242	if (new_margin < 1)
	243	return -EINVAL;
	244
670d59c0	245	spin_lock(&wdt_lock);
c283cf2c MC	246	ar7_wdt_update_margin(new_margin);
c283cf2c MC	247	ar7_wdt_kick(1);
670d59c0	248	spin_unlock(&wdt_lock);
c283cf2c MC	249
	250	case WDIOC_GETTIMEOUT:
	251	if (put_user(margin, (int *)arg))
	252	return -EFAULT;
	253	return 0;
0c06090c WVS	254	default:
0c06090c WVS	255	return -ENOTTY;
c283cf2c MC	256	}
	257	}
	258
b47a166e	259	static const struct file_operations ar7_wdt_fops = {
c283cf2c MC	260	.owner = THIS_MODULE,
c283cf2c MC	261	.write = ar7_wdt_write,
670d59c0	262	.unlocked_ioctl = ar7_wdt_ioctl,
c283cf2c MC	263	.open = ar7_wdt_open,
	264	.release = ar7_wdt_release,
	265	};
	266
	267	static struct miscdevice ar7_wdt_miscdev = {
	268	.minor = WATCHDOG_MINOR,
	269	.name = "watchdog",
	270	.fops = &ar7_wdt_fops,
	271	};
	272
64d4062a	273	static int __devinit ar7_wdt_probe(struct platform_device *pdev)
c283cf2c MC	274	{
	275	int rc;
	276
670d59c0 AC	277	spin_lock_init(&wdt_lock);
670d59c0 AC	278
64d4062a FF	279	ar7_regs_wdt =
	280	platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
	281	if (!ar7_regs_wdt) {
	282	printk(KERN_ERR DRVNAME ": could not get registers resource\n");
	283	rc = -ENODEV;
	284	goto out;
	285	}
c283cf2c	286
64d4062a FF	287	if (!request_mem_region(ar7_regs_wdt->start,
64d4062a FF	288	resource_size(ar7_regs_wdt), LONGNAME)) {
c283cf2c	289	printk(KERN_WARNING DRVNAME ": watchdog I/O region busy\n");
64d4062a FF	290	rc = -EBUSY;
64d4062a FF	291	goto out;
c283cf2c MC	292	}
c283cf2c MC	293
64d4062a FF	294	ar7_wdt = ioremap(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
	295	if (!ar7_wdt) {
	296	printk(KERN_ERR DRVNAME ": could not ioremap registers\n");
	297	rc = -ENXIO;
d7e9791b	298	goto out_mem_region;
64d4062a	299	}
c283cf2c MC	300
	301	ar7_wdt_disable_wdt();
	302	ar7_wdt_prescale(prescale_value);
	303	ar7_wdt_update_margin(margin);
	304
c283cf2c MC	305	rc = misc_register(&ar7_wdt_miscdev);
	306	if (rc) {
	307	printk(KERN_ERR DRVNAME ": unable to register misc device\n");
64d4062a	308	goto out_alloc;
c283cf2c MC	309	}
	310	goto out;
	311
c283cf2c MC	312	out_alloc:
c283cf2c MC	313	iounmap(ar7_wdt);
d7e9791b	314	out_mem_region:
64d4062a	315	release_mem_region(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
c283cf2c MC	316	out:
	317	return rc;
	318	}
	319
64d4062a	320	static int __devexit ar7_wdt_remove(struct platform_device *pdev)
c283cf2c MC	321	{
c283cf2c MC	322	misc_deregister(&ar7_wdt_miscdev);
c283cf2c	323	iounmap(ar7_wdt);
64d4062a FF	324	release_mem_region(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
	325
	326	return 0;
	327	}
	328
	329	static void ar7_wdt_shutdown(struct platform_device *pdev)
	330	{
	331	if (!nowayout)
	332	ar7_wdt_disable_wdt();
	333	}
	334
	335	static struct platform_driver ar7_wdt_driver = {
	336	.probe = ar7_wdt_probe,
	337	.remove = __devexit_p(ar7_wdt_remove),
	338	.shutdown = ar7_wdt_shutdown,
	339	.driver = {
	340	.owner = THIS_MODULE,
	341	.name = "ar7_wdt",
	342	},
	343	};
	344
	345	static int __init ar7_wdt_init(void)
	346	{
	347	return platform_driver_register(&ar7_wdt_driver);
	348	}
	349
	350	static void __exit ar7_wdt_cleanup(void)
	351	{
	352	platform_driver_unregister(&ar7_wdt_driver);
c283cf2c MC	353	}
	354
	355	module_init(ar7_wdt_init);
	356	module_exit(ar7_wdt_cleanup);