[linux-2.6-block.git] / drivers / watchdog / ie6xx_wdt.c

/*
 *      Intel Atom E6xx Watchdog driver
 *
 *      Copyright (C) 2011 Alexander Stein
 *                <alexander.stein@systec-electronic.com>
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of version 2 of the GNU General
 *      Public License as published by the Free Software Foundation.
 *
 *      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., 59 Temple Place - Suite 330,
 *      Boston, MA  02111-1307, USA.
 *      The full GNU General Public License is included in this
 *      distribution in the file called COPYING.
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/watchdog.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/spinlock.h>

#define DRIVER_NAME "ie6xx_wdt"

#define PV1	0x00
#define PV2	0x04

#define RR0	0x0c
#define RR1	0x0d
#define WDT_RELOAD	0x01
#define WDT_TOUT	0x02

#define WDTCR	0x10
#define WDT_PRE_SEL	0x04
#define WDT_RESET_SEL	0x08
#define WDT_RESET_EN	0x10
#define WDT_TOUT_EN	0x20

#define DCR	0x14

#define WDTLR	0x18
#define WDT_LOCK	0x01
#define WDT_ENABLE	0x02
#define WDT_TOUT_CNF	0x03

#define MIN_TIME	1
#define MAX_TIME	(10 * 60) /* 10 minutes */
#define DEFAULT_TIME	60

static unsigned int timeout = DEFAULT_TIME;
module_param(timeout, uint, 0);
MODULE_PARM_DESC(timeout,
		"Default Watchdog timer setting ("
		__MODULE_STRING(DEFAULT_TIME) "s)."
		"The range is from 1 to 600");

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) ")");

static u8 resetmode = 0x10;
module_param(resetmode, byte, 0);
MODULE_PARM_DESC(resetmode,
	"Resetmode bits: 0x08 warm reset (cold reset otherwise), "
	"0x10 reset enable, 0x20 disable toggle GPIO[4] (default=0x10)");

static struct {
	unsigned short sch_wdtba;
	struct spinlock unlock_sequence;
#ifdef CONFIG_DEBUG_FS
	struct dentry *debugfs;
#endif
} ie6xx_wdt_data;

/*
 * This is needed to write to preload and reload registers
 * struct ie6xx_wdt_data.unlock_sequence must be used
 * to prevent sequence interrupts
 */
static void ie6xx_wdt_unlock_registers(void)
{
	outb(0x80, ie6xx_wdt_data.sch_wdtba + RR0);
	outb(0x86, ie6xx_wdt_data.sch_wdtba + RR0);
}

static int ie6xx_wdt_ping(struct watchdog_device *wdd)
{
	spin_lock(&ie6xx_wdt_data.unlock_sequence);
	ie6xx_wdt_unlock_registers();
	outb(WDT_RELOAD, ie6xx_wdt_data.sch_wdtba + RR1);
	spin_unlock(&ie6xx_wdt_data.unlock_sequence);
	return 0;
}

static int ie6xx_wdt_set_timeout(struct watchdog_device *wdd, unsigned int t)
{
	u32 preload;
	u64 clock;
	u8 wdtcr;

	/* Watchdog clock is PCI Clock (33MHz) */
	clock = 33000000;
	/* and the preload value is loaded into [34:15] of the down counter */
	preload = (t * clock) >> 15;
	/*
	 * Manual states preload must be one less.
	 * Does not wrap as t is at least 1
	 */
	preload -= 1;

	spin_lock(&ie6xx_wdt_data.unlock_sequence);

	/* Set ResetMode & Enable prescaler for range 10ms to 10 min */
	wdtcr = resetmode & 0x38;
	outb(wdtcr, ie6xx_wdt_data.sch_wdtba + WDTCR);

	ie6xx_wdt_unlock_registers();
	outl(0, ie6xx_wdt_data.sch_wdtba + PV1);

	ie6xx_wdt_unlock_registers();
	outl(preload, ie6xx_wdt_data.sch_wdtba + PV2);

	ie6xx_wdt_unlock_registers();
	outb(WDT_RELOAD | WDT_TOUT, ie6xx_wdt_data.sch_wdtba + RR1);

	spin_unlock(&ie6xx_wdt_data.unlock_sequence);

	wdd->timeout = t;
	return 0;
}

static int ie6xx_wdt_start(struct watchdog_device *wdd)
{
	ie6xx_wdt_set_timeout(wdd, wdd->timeout);

	/* Enable the watchdog timer */
	spin_lock(&ie6xx_wdt_data.unlock_sequence);
	outb(WDT_ENABLE, ie6xx_wdt_data.sch_wdtba + WDTLR);
	spin_unlock(&ie6xx_wdt_data.unlock_sequence);

	return 0;
}

static int ie6xx_wdt_stop(struct watchdog_device *wdd)
{
	if (inb(ie6xx_wdt_data.sch_wdtba + WDTLR) & WDT_LOCK)
		return -1;

	/* Disable the watchdog timer */
	spin_lock(&ie6xx_wdt_data.unlock_sequence);
	outb(0, ie6xx_wdt_data.sch_wdtba + WDTLR);
	spin_unlock(&ie6xx_wdt_data.unlock_sequence);

	return 0;
}

static const struct watchdog_info ie6xx_wdt_info = {
	.identity =	"Intel Atom E6xx Watchdog",
	.options =	WDIOF_SETTIMEOUT |
			WDIOF_MAGICCLOSE |
			WDIOF_KEEPALIVEPING,
};

static const struct watchdog_ops ie6xx_wdt_ops = {
	.owner =	THIS_MODULE,
	.start =	ie6xx_wdt_start,
	.stop =		ie6xx_wdt_stop,
	.ping =		ie6xx_wdt_ping,
	.set_timeout =	ie6xx_wdt_set_timeout,
};

static struct watchdog_device ie6xx_wdt_dev = {
	.info =		&ie6xx_wdt_info,
	.ops =		&ie6xx_wdt_ops,
	.min_timeout =	MIN_TIME,
	.max_timeout =	MAX_TIME,
};

#ifdef CONFIG_DEBUG_FS

static int ie6xx_wdt_show(struct seq_file *s, void *unused)
{
	seq_printf(s, "PV1   = 0x%08x\n",
		inl(ie6xx_wdt_data.sch_wdtba + PV1));
	seq_printf(s, "PV2   = 0x%08x\n",
		inl(ie6xx_wdt_data.sch_wdtba + PV2));
	seq_printf(s, "RR    = 0x%08x\n",
		inw(ie6xx_wdt_data.sch_wdtba + RR0));
	seq_printf(s, "WDTCR = 0x%08x\n",
		inw(ie6xx_wdt_data.sch_wdtba + WDTCR));
	seq_printf(s, "DCR   = 0x%08x\n",
		inl(ie6xx_wdt_data.sch_wdtba + DCR));
	seq_printf(s, "WDTLR = 0x%08x\n",
		inw(ie6xx_wdt_data.sch_wdtba + WDTLR));

	seq_printf(s, "\n");
	return 0;
}

DEFINE_SHOW_ATTRIBUTE(ie6xx_wdt);

static void ie6xx_wdt_debugfs_init(void)
{
	/* /sys/kernel/debug/ie6xx_wdt */
	ie6xx_wdt_data.debugfs = debugfs_create_file("ie6xx_wdt",
		S_IFREG | S_IRUGO, NULL, NULL, &ie6xx_wdt_fops);
}

static void ie6xx_wdt_debugfs_exit(void)
{
	debugfs_remove(ie6xx_wdt_data.debugfs);
}

#else
static void ie6xx_wdt_debugfs_init(void)
{
}

static void ie6xx_wdt_debugfs_exit(void)
{
}
#endif

static int ie6xx_wdt_probe(struct platform_device *pdev)
{
	struct resource *res;
	u8 wdtlr;
	int ret;

	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	if (!res)
		return -ENODEV;

	if (!request_region(res->start, resource_size(res), pdev->name)) {
		dev_err(&pdev->dev, "Watchdog region 0x%llx already in use!\n",
			(u64)res->start);
		return -EBUSY;
	}

	ie6xx_wdt_data.sch_wdtba = res->start;
	dev_dbg(&pdev->dev, "WDT = 0x%X\n", ie6xx_wdt_data.sch_wdtba);

	ie6xx_wdt_dev.timeout = timeout;
	watchdog_set_nowayout(&ie6xx_wdt_dev, nowayout);
	ie6xx_wdt_dev.parent = &pdev->dev;

	spin_lock_init(&ie6xx_wdt_data.unlock_sequence);

	wdtlr = inb(ie6xx_wdt_data.sch_wdtba + WDTLR);
	if (wdtlr & WDT_LOCK)
		dev_warn(&pdev->dev,
			"Watchdog Timer is Locked (Reg=0x%x)\n", wdtlr);

	ie6xx_wdt_debugfs_init();

	ret = watchdog_register_device(&ie6xx_wdt_dev);
	if (ret) {
		dev_err(&pdev->dev,
			"Watchdog timer: cannot register device (err =%d)\n",
									ret);
		goto misc_register_error;
	}

	return 0;

misc_register_error:
	ie6xx_wdt_debugfs_exit();
	release_region(res->start, resource_size(res));
	ie6xx_wdt_data.sch_wdtba = 0;
	return ret;
}

static int ie6xx_wdt_remove(struct platform_device *pdev)
{
	struct resource *res;

	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	ie6xx_wdt_stop(NULL);
	watchdog_unregister_device(&ie6xx_wdt_dev);
	ie6xx_wdt_debugfs_exit();
	release_region(res->start, resource_size(res));
	ie6xx_wdt_data.sch_wdtba = 0;

	return 0;
}

static struct platform_driver ie6xx_wdt_driver = {
	.probe		= ie6xx_wdt_probe,
	.remove		= ie6xx_wdt_remove,
	.driver		= {
		.name	= DRIVER_NAME,
	},
};

static int __init ie6xx_wdt_init(void)
{
	/* Check boot parameters to verify that their initial values */
	/* are in range. */
	if ((timeout < MIN_TIME) ||
	    (timeout > MAX_TIME)) {
		pr_err("Watchdog timer: value of timeout %d (dec) "
		  "is out of range from %d to %d (dec)\n",
		  timeout, MIN_TIME, MAX_TIME);
		return -EINVAL;
	}

	return platform_driver_register(&ie6xx_wdt_driver);
}

static void __exit ie6xx_wdt_exit(void)
{
	platform_driver_unregister(&ie6xx_wdt_driver);
}

late_initcall(ie6xx_wdt_init);
module_exit(ie6xx_wdt_exit);

MODULE_AUTHOR("Alexander Stein <alexander.stein@systec-electronic.com>");
MODULE_DESCRIPTION("Intel Atom E6xx Watchdog Device Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRIVER_NAME);
Commit	Line	Data
101ce87b AS	1	/*
	2	* Intel Atom E6xx Watchdog driver
	3	*
	4	* Copyright (C) 2011 Alexander Stein
	5	* <alexander.stein@systec-electronic.com>
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of version 2 of the GNU General
	9	* Public License as published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be
	12	* useful, but WITHOUT ANY WARRANTY; without even the implied
	13	* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
	14	* PURPOSE. See the GNU General Public License for more details.
	15	* You should have received a copy of the GNU General Public
	16	* License along with this program; if not, write to the Free
	17	* Software Foundation, Inc., 59 Temple Place - Suite 330,
	18	* Boston, MA 02111-1307, USA.
	19	* The full GNU General Public License is included in this
	20	* distribution in the file called COPYING.
	21	*
	22	*/
	23
	24	#include <linux/module.h>
	25	#include <linux/moduleparam.h>
	26	#include <linux/platform_device.h>
491d9e2a	27	#include <linux/io.h>
101ce87b AS	28	#include <linux/kernel.h>
	29	#include <linux/types.h>
	30	#include <linux/watchdog.h>
101ce87b AS	31	#include <linux/seq_file.h>
	32	#include <linux/debugfs.h>
	33	#include <linux/uaccess.h>
	34	#include <linux/spinlock.h>
	35
	36	#define DRIVER_NAME "ie6xx_wdt"
	37
	38	#define PV1 0x00
	39	#define PV2 0x04
	40
	41	#define RR0 0x0c
	42	#define RR1 0x0d
	43	#define WDT_RELOAD 0x01
	44	#define WDT_TOUT 0x02
	45
	46	#define WDTCR 0x10
	47	#define WDT_PRE_SEL 0x04
	48	#define WDT_RESET_SEL 0x08
	49	#define WDT_RESET_EN 0x10
	50	#define WDT_TOUT_EN 0x20
	51
	52	#define DCR 0x14
	53
	54	#define WDTLR 0x18
	55	#define WDT_LOCK 0x01
	56	#define WDT_ENABLE 0x02
	57	#define WDT_TOUT_CNF 0x03
	58
	59	#define MIN_TIME 1
	60	#define MAX_TIME (10 * 60) /* 10 minutes */
	61	#define DEFAULT_TIME 60
	62
	63	static unsigned int timeout = DEFAULT_TIME;
	64	module_param(timeout, uint, 0);
	65	MODULE_PARM_DESC(timeout,
	66	"Default Watchdog timer setting ("
	67	__MODULE_STRING(DEFAULT_TIME) "s)."
	68	"The range is from 1 to 600");
	69
	70	static bool nowayout = WATCHDOG_NOWAYOUT;
	71	module_param(nowayout, bool, 0);
	72	MODULE_PARM_DESC(nowayout,
	73	"Watchdog cannot be stopped once started (default="
	74	__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
	75
	76	static u8 resetmode = 0x10;
	77	module_param(resetmode, byte, 0);
	78	MODULE_PARM_DESC(resetmode,
	79	"Resetmode bits: 0x08 warm reset (cold reset otherwise), "
	80	"0x10 reset enable, 0x20 disable toggle GPIO[4] (default=0x10)");
	81
	82	static struct {
	83	unsigned short sch_wdtba;
	84	struct spinlock unlock_sequence;
	85	#ifdef CONFIG_DEBUG_FS
	86	struct dentry *debugfs;
	87	#endif
	88	} ie6xx_wdt_data;
	89
	90	/*
	91	* This is needed to write to preload and reload registers
	92	* struct ie6xx_wdt_data.unlock_sequence must be used
	93	* to prevent sequence interrupts
	94	*/
95	static void ie6xx_wdt_unlock_registers(void)
96	{
97	outb(0x80, ie6xx_wdt_data.sch_wdtba + RR0);
98	outb(0x86, ie6xx_wdt_data.sch_wdtba + RR0);
99	}
100
101	static int ie6xx_wdt_ping(struct watchdog_device *wdd)
102	{
103	spin_lock(&ie6xx_wdt_data.unlock_sequence);
104	ie6xx_wdt_unlock_registers();
105	outb(WDT_RELOAD, ie6xx_wdt_data.sch_wdtba + RR1);
106	spin_unlock(&ie6xx_wdt_data.unlock_sequence);
107	return 0;
108	}
109
110	static int ie6xx_wdt_set_timeout(struct watchdog_device *wdd, unsigned int t)
111	{
112	u32 preload;
113	u64 clock;
114	u8 wdtcr;
115
116	/* Watchdog clock is PCI Clock (33MHz) */
117	clock = 33000000;
118	/* and the preload value is loaded into [34:15] of the down counter */
119	preload = (t * clock) >> 15;
120	/*
121	* Manual states preload must be one less.
122	* Does not wrap as t is at least 1
123	*/
124	preload -= 1;
125
126	spin_lock(&ie6xx_wdt_data.unlock_sequence);
127
128	/* Set ResetMode & Enable prescaler for range 10ms to 10 min */
129	wdtcr = resetmode & 0x38;
130	outb(wdtcr, ie6xx_wdt_data.sch_wdtba + WDTCR);
131
132	ie6xx_wdt_unlock_registers();
133	outl(0, ie6xx_wdt_data.sch_wdtba + PV1);
134
135	ie6xx_wdt_unlock_registers();
136	outl(preload, ie6xx_wdt_data.sch_wdtba + PV2);
137
138	ie6xx_wdt_unlock_registers();
139	outb(WDT_RELOAD \| WDT_TOUT, ie6xx_wdt_data.sch_wdtba + RR1);
140
141	spin_unlock(&ie6xx_wdt_data.unlock_sequence);
142
143	wdd->timeout = t;
144	return 0;
145	}
146
147	static int ie6xx_wdt_start(struct watchdog_device *wdd)
148	{
149	ie6xx_wdt_set_timeout(wdd, wdd->timeout);
150
151	/* Enable the watchdog timer */
152	spin_lock(&ie6xx_wdt_data.unlock_sequence);
153	outb(WDT_ENABLE, ie6xx_wdt_data.sch_wdtba + WDTLR);
154	spin_unlock(&ie6xx_wdt_data.unlock_sequence);
155
156	return 0;
157	}
158
159	static int ie6xx_wdt_stop(struct watchdog_device *wdd)
160	{
161	if (inb(ie6xx_wdt_data.sch_wdtba + WDTLR) & WDT_LOCK)
162	return -1;
163
164	/* Disable the watchdog timer */
165	spin_lock(&ie6xx_wdt_data.unlock_sequence);
166	outb(0, ie6xx_wdt_data.sch_wdtba + WDTLR);
167	spin_unlock(&ie6xx_wdt_data.unlock_sequence);
168
169	return 0;
170	}
171
172	static const struct watchdog_info ie6xx_wdt_info = {
173	.identity = "Intel Atom E6xx Watchdog",
174	.options = WDIOF_SETTIMEOUT \|
175	WDIOF_MAGICCLOSE \|
176	WDIOF_KEEPALIVEPING,
177	};
178
179	static const struct watchdog_ops ie6xx_wdt_ops = {
180	.owner = THIS_MODULE,
181	.start = ie6xx_wdt_start,
182	.stop = ie6xx_wdt_stop,
183	.ping = ie6xx_wdt_ping,
184	.set_timeout = ie6xx_wdt_set_timeout,
185	};
186
187	static struct watchdog_device ie6xx_wdt_dev = {
188	.info = &ie6xx_wdt_info,
189	.ops = &ie6xx_wdt_ops,
190	.min_timeout = MIN_TIME,
191	.max_timeout = MAX_TIME,
192	};
193
194	#ifdef CONFIG_DEBUG_FS
195
248e655b	196	static int ie6xx_wdt_show(struct seq_file s, void unused)
101ce87b AS	197	{
	198	seq_printf(s, "PV1 = 0x%08x\n",
	199	inl(ie6xx_wdt_data.sch_wdtba + PV1));
	200	seq_printf(s, "PV2 = 0x%08x\n",
	201	inl(ie6xx_wdt_data.sch_wdtba + PV2));
	202	seq_printf(s, "RR = 0x%08x\n",
	203	inw(ie6xx_wdt_data.sch_wdtba + RR0));
	204	seq_printf(s, "WDTCR = 0x%08x\n",
	205	inw(ie6xx_wdt_data.sch_wdtba + WDTCR));
	206	seq_printf(s, "DCR = 0x%08x\n",
	207	inl(ie6xx_wdt_data.sch_wdtba + DCR));
	208	seq_printf(s, "WDTLR = 0x%08x\n",
	209	inw(ie6xx_wdt_data.sch_wdtba + WDTLR));
	210
	211	seq_printf(s, "\n");
	212	return 0;
	213	}
	214
248e655b	215	DEFINE_SHOW_ATTRIBUTE(ie6xx_wdt);
101ce87b	216
2d991a16	217	static void ie6xx_wdt_debugfs_init(void)
101ce87b AS	218	{
	219	/* /sys/kernel/debug/ie6xx_wdt */
	220	ie6xx_wdt_data.debugfs = debugfs_create_file("ie6xx_wdt",
248e655b	221	S_IFREG \| S_IRUGO, NULL, NULL, &ie6xx_wdt_fops);
101ce87b AS	222	}
101ce87b AS	223
0402450f	224	static void ie6xx_wdt_debugfs_exit(void)
101ce87b AS	225	{
	226	debugfs_remove(ie6xx_wdt_data.debugfs);
	227	}
	228
	229	#else
2d991a16	230	static void ie6xx_wdt_debugfs_init(void)
101ce87b AS	231	{
	232	}
	233
0402450f	234	static void ie6xx_wdt_debugfs_exit(void)
101ce87b AS	235	{
	236	}
	237	#endif
	238
2d991a16	239	static int ie6xx_wdt_probe(struct platform_device *pdev)
101ce87b AS	240	{
	241	struct resource *res;
	242	u8 wdtlr;
	243	int ret;
	244
	245	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	246	if (!res)
	247	return -ENODEV;
	248
	249	if (!request_region(res->start, resource_size(res), pdev->name)) {
744f6f4d RD	250	dev_err(&pdev->dev, "Watchdog region 0x%llx already in use!\n",
744f6f4d RD	251	(u64)res->start);
101ce87b AS	252	return -EBUSY;
	253	}
	254
	255	ie6xx_wdt_data.sch_wdtba = res->start;
	256	dev_dbg(&pdev->dev, "WDT = 0x%X\n", ie6xx_wdt_data.sch_wdtba);
	257
	258	ie6xx_wdt_dev.timeout = timeout;
	259	watchdog_set_nowayout(&ie6xx_wdt_dev, nowayout);
6551881c	260	ie6xx_wdt_dev.parent = &pdev->dev;
101ce87b AS	261
	262	spin_lock_init(&ie6xx_wdt_data.unlock_sequence);
	263
	264	wdtlr = inb(ie6xx_wdt_data.sch_wdtba + WDTLR);
	265	if (wdtlr & WDT_LOCK)
	266	dev_warn(&pdev->dev,
	267	"Watchdog Timer is Locked (Reg=0x%x)\n", wdtlr);
	268
	269	ie6xx_wdt_debugfs_init();
	270
	271	ret = watchdog_register_device(&ie6xx_wdt_dev);
	272	if (ret) {
	273	dev_err(&pdev->dev,
	274	"Watchdog timer: cannot register device (err =%d)\n",
	275	ret);
	276	goto misc_register_error;
	277	}
	278
	279	return 0;
	280
	281	misc_register_error:
	282	ie6xx_wdt_debugfs_exit();
	283	release_region(res->start, resource_size(res));
	284	ie6xx_wdt_data.sch_wdtba = 0;
	285	return ret;
	286	}
	287
4b12b896	288	static int ie6xx_wdt_remove(struct platform_device *pdev)
101ce87b AS	289	{
	290	struct resource *res;
	291
	292	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	293	ie6xx_wdt_stop(NULL);
	294	watchdog_unregister_device(&ie6xx_wdt_dev);
	295	ie6xx_wdt_debugfs_exit();
	296	release_region(res->start, resource_size(res));
	297	ie6xx_wdt_data.sch_wdtba = 0;
	298
	299	return 0;
	300	}
	301
	302	static struct platform_driver ie6xx_wdt_driver = {
	303	.probe = ie6xx_wdt_probe,
82268714	304	.remove = ie6xx_wdt_remove,
101ce87b AS	305	.driver = {
101ce87b AS	306	.name = DRIVER_NAME,
101ce87b AS	307	},
	308	};
	309
	310	static int __init ie6xx_wdt_init(void)
	311	{
	312	/* Check boot parameters to verify that their initial values */
	313	/* are in range. */
	314	if ((timeout < MIN_TIME) \|\|
	315	(timeout > MAX_TIME)) {
	316	pr_err("Watchdog timer: value of timeout %d (dec) "
	317	"is out of range from %d to %d (dec)\n",
	318	timeout, MIN_TIME, MAX_TIME);
	319	return -EINVAL;
	320	}
	321
	322	return platform_driver_register(&ie6xx_wdt_driver);
	323	}
	324
	325	static void __exit ie6xx_wdt_exit(void)
	326	{
	327	platform_driver_unregister(&ie6xx_wdt_driver);
	328	}
	329
	330	late_initcall(ie6xx_wdt_init);
	331	module_exit(ie6xx_wdt_exit);
	332
	333	MODULE_AUTHOR("Alexander Stein <alexander.stein@systec-electronic.com>");
	334	MODULE_DESCRIPTION("Intel Atom E6xx Watchdog Device Driver");
	335	MODULE_LICENSE("GPL");
101ce87b	336	MODULE_ALIAS("platform:" DRIVER_NAME);