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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Paul Mundtb1fa8882010-05-24 10:55:59 +09002 * drivers/watchdog/shwdt.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * Watchdog driver for integrated watchdog in the SuperH processors.
5 *
Paul Mundtb1fa8882010-05-24 10:55:59 +09006 * Copyright (C) 2001 - 2010 Paul Mundt <lethal@linux-sh.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 * 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
14 * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
15 *
16 * 19-Apr-2002 Rob Radez <rob@osinvestor.com>
17 * Added expect close support, made emulated timeout runtime changeable
18 * general cleanups, add some ioctls
19 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/module.h>
21#include <linux/moduleparam.h>
Paul Mundt8f5585e2010-05-25 18:31:12 +090022#include <linux/platform_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/init.h>
24#include <linux/types.h>
25#include <linux/miscdevice.h>
26#include <linux/watchdog.h>
27#include <linux/reboot.h>
28#include <linux/notifier.h>
29#include <linux/ioport.h>
30#include <linux/fs.h>
Paul Mundtf1184202006-09-27 17:53:59 +090031#include <linux/mm.h>
Paul Mundt8f5585e2010-05-25 18:31:12 +090032#include <linux/slab.h>
Alan Cox70b814e2008-05-19 14:08:55 +010033#include <linux/io.h>
34#include <linux/uaccess.h>
Adrian Bunk58cf4192008-08-08 18:39:11 +030035#include <asm/watchdog.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Paul Mundt8f5585e2010-05-25 18:31:12 +090037#define DRV_NAME "sh-wdt"
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39/*
40 * Default clock division ratio is 5.25 msecs. For an additional table of
41 * values, consult the asm-sh/watchdog.h. Overload this at module load
42 * time.
43 *
44 * In order for this to work reliably we need to have HZ set to 1000 or
45 * something quite higher than 100 (or we need a proper high-res timer
46 * implementation that will deal with this properly), otherwise the 10ms
47 * resolution of a jiffy is enough to trigger the overflow. For things like
48 * the SH-4 and SH-5, this isn't necessarily that big of a problem, though
49 * for the SH-2 and SH-3, this isn't recommended unless the WDT is absolutely
50 * necssary.
51 *
52 * As a result of this timing problem, the only modes that are particularly
Lucas De Marchi25985ed2011-03-30 22:57:33 -030053 * feasible are the 4096 and the 2048 divisors, which yield 5.25 and 2.62ms
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 * overflow periods respectively.
55 *
56 * Also, since we can't really expect userspace to be responsive enough
Joe Perchesee0fc092008-02-03 17:32:52 +020057 * before the overflow happens, we maintain two separate timers .. One in
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 * the kernel for clearing out WOVF every 2ms or so (again, this depends on
59 * HZ == 1000), and another for monitoring userspace writes to the WDT device.
60 *
61 * As such, we currently use a configurable heartbeat interval which defaults
62 * to 30s. In this case, the userspace daemon is only responsible for periodic
63 * writes to the device before the next heartbeat is scheduled. If the daemon
64 * misses its deadline, the kernel timer will allow the WDT to overflow.
65 */
66static int clock_division_ratio = WTCSR_CKS_4096;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#define next_ping_period(cks) msecs_to_jiffies(cks - 4)
68
Adrian Bunk58cf4192008-08-08 18:39:11 +030069static const struct watchdog_info sh_wdt_info;
Paul Mundt8f5585e2010-05-25 18:31:12 +090070static struct platform_device *sh_wdt_dev;
Alan Cox70b814e2008-05-19 14:08:55 +010071static DEFINE_SPINLOCK(shwdt_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73#define WATCHDOG_HEARTBEAT 30 /* 30 sec default heartbeat */
74static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */
Andrey Panin4bfdf372005-07-27 11:43:58 -070075static int nowayout = WATCHDOG_NOWAYOUT;
Paul Mundt8f5585e2010-05-25 18:31:12 +090076static unsigned long next_heartbeat;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
Paul Mundt8f5585e2010-05-25 18:31:12 +090078struct sh_wdt {
79 void __iomem *base;
80 struct device *dev;
81
82 struct timer_list timer;
83
84 unsigned long enabled;
85 char expect_close;
86};
87
88static void sh_wdt_start(struct sh_wdt *wdt)
Linus Torvalds1da177e2005-04-16 15:20:36 -070089{
Alan Cox70b814e2008-05-19 14:08:55 +010090 unsigned long flags;
Paul Mundt8f5585e2010-05-25 18:31:12 +090091 u8 csr;
Alan Cox70b814e2008-05-19 14:08:55 +010092
Adrian Bunk58cf4192008-08-08 18:39:11 +030093 spin_lock_irqsave(&shwdt_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
95 next_heartbeat = jiffies + (heartbeat * HZ);
Paul Mundt8f5585e2010-05-25 18:31:12 +090096 mod_timer(&wdt->timer, next_ping_period(clock_division_ratio));
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
98 csr = sh_wdt_read_csr();
99 csr |= WTCSR_WT | clock_division_ratio;
100 sh_wdt_write_csr(csr);
101
102 sh_wdt_write_cnt(0);
103
104 /*
105 * These processors have a bit of an inconsistent initialization
106 * process.. starting with SH-3, RSTS was moved to WTCSR, and the
107 * RSTCSR register was removed.
108 *
109 * On the SH-2 however, in addition with bits being in different
110 * locations, we must deal with RSTCSR outright..
111 */
112 csr = sh_wdt_read_csr();
113 csr |= WTCSR_TME;
114 csr &= ~WTCSR_RSTS;
115 sh_wdt_write_csr(csr);
116
117#ifdef CONFIG_CPU_SH2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 csr = sh_wdt_read_rstcsr();
119 csr &= ~RSTCSR_RSTS;
120 sh_wdt_write_rstcsr(csr);
121#endif
Adrian Bunk58cf4192008-08-08 18:39:11 +0300122 spin_unlock_irqrestore(&shwdt_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123}
124
Paul Mundt8f5585e2010-05-25 18:31:12 +0900125static void sh_wdt_stop(struct sh_wdt *wdt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126{
Alan Cox70b814e2008-05-19 14:08:55 +0100127 unsigned long flags;
Paul Mundt8f5585e2010-05-25 18:31:12 +0900128 u8 csr;
Alan Cox70b814e2008-05-19 14:08:55 +0100129
Adrian Bunk58cf4192008-08-08 18:39:11 +0300130 spin_lock_irqsave(&shwdt_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Paul Mundt8f5585e2010-05-25 18:31:12 +0900132 del_timer(&wdt->timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
134 csr = sh_wdt_read_csr();
135 csr &= ~WTCSR_TME;
136 sh_wdt_write_csr(csr);
Paul Mundt8f5585e2010-05-25 18:31:12 +0900137
Adrian Bunk58cf4192008-08-08 18:39:11 +0300138 spin_unlock_irqrestore(&shwdt_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139}
140
Paul Mundt8f5585e2010-05-25 18:31:12 +0900141static inline void sh_wdt_keepalive(struct sh_wdt *wdt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142{
Alan Cox70b814e2008-05-19 14:08:55 +0100143 unsigned long flags;
144
Adrian Bunk58cf4192008-08-08 18:39:11 +0300145 spin_lock_irqsave(&shwdt_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 next_heartbeat = jiffies + (heartbeat * HZ);
Adrian Bunk58cf4192008-08-08 18:39:11 +0300147 spin_unlock_irqrestore(&shwdt_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148}
149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150static int sh_wdt_set_heartbeat(int t)
151{
Alan Cox70b814e2008-05-19 14:08:55 +0100152 unsigned long flags;
153
154 if (unlikely(t < 1 || t > 3600)) /* arbitrary upper limit */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 return -EINVAL;
156
Adrian Bunk58cf4192008-08-08 18:39:11 +0300157 spin_lock_irqsave(&shwdt_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 heartbeat = t;
Adrian Bunk58cf4192008-08-08 18:39:11 +0300159 spin_unlock_irqrestore(&shwdt_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 return 0;
161}
162
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163static void sh_wdt_ping(unsigned long data)
164{
Paul Mundt8f5585e2010-05-25 18:31:12 +0900165 struct sh_wdt *wdt = (struct sh_wdt *)data;
Alan Cox70b814e2008-05-19 14:08:55 +0100166 unsigned long flags;
167
Adrian Bunk58cf4192008-08-08 18:39:11 +0300168 spin_lock_irqsave(&shwdt_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 if (time_before(jiffies, next_heartbeat)) {
Paul Mundt8f5585e2010-05-25 18:31:12 +0900170 u8 csr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
172 csr = sh_wdt_read_csr();
173 csr &= ~WTCSR_IOVF;
174 sh_wdt_write_csr(csr);
175
176 sh_wdt_write_cnt(0);
177
Paul Mundt8f5585e2010-05-25 18:31:12 +0900178 mod_timer(&wdt->timer, next_ping_period(clock_division_ratio));
Paul Mundte4c2cfe2006-09-27 12:31:01 +0900179 } else
Paul Mundt8f5585e2010-05-25 18:31:12 +0900180 dev_warn(wdt->dev, "Heartbeat lost! Will not ping "
181 "the watchdog\n");
Adrian Bunk58cf4192008-08-08 18:39:11 +0300182 spin_unlock_irqrestore(&shwdt_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183}
184
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185static int sh_wdt_open(struct inode *inode, struct file *file)
186{
Paul Mundt8f5585e2010-05-25 18:31:12 +0900187 struct sh_wdt *wdt = platform_get_drvdata(sh_wdt_dev);
188
189 if (test_and_set_bit(0, &wdt->enabled))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 return -EBUSY;
191 if (nowayout)
192 __module_get(THIS_MODULE);
193
Paul Mundt8f5585e2010-05-25 18:31:12 +0900194 file->private_data = wdt;
195
196 sh_wdt_start(wdt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
198 return nonseekable_open(inode, file);
199}
200
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201static int sh_wdt_close(struct inode *inode, struct file *file)
202{
Paul Mundt8f5585e2010-05-25 18:31:12 +0900203 struct sh_wdt *wdt = file->private_data;
204
205 if (wdt->expect_close == 42) {
206 sh_wdt_stop(wdt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 } else {
Paul Mundt8f5585e2010-05-25 18:31:12 +0900208 dev_crit(wdt->dev, "Unexpected close, not "
209 "stopping watchdog!\n");
210 sh_wdt_keepalive(wdt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 }
212
Paul Mundt8f5585e2010-05-25 18:31:12 +0900213 clear_bit(0, &wdt->enabled);
214 wdt->expect_close = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
216 return 0;
217}
218
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219static ssize_t sh_wdt_write(struct file *file, const char *buf,
220 size_t count, loff_t *ppos)
221{
Paul Mundt8f5585e2010-05-25 18:31:12 +0900222 struct sh_wdt *wdt = file->private_data;
223
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 if (count) {
225 if (!nowayout) {
226 size_t i;
227
Paul Mundt8f5585e2010-05-25 18:31:12 +0900228 wdt->expect_close = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
230 for (i = 0; i != count; i++) {
231 char c;
232 if (get_user(c, buf + i))
233 return -EFAULT;
234 if (c == 'V')
Paul Mundt8f5585e2010-05-25 18:31:12 +0900235 wdt->expect_close = 42;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 }
237 }
Paul Mundt8f5585e2010-05-25 18:31:12 +0900238 sh_wdt_keepalive(wdt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 }
240
241 return count;
242}
243
Alan Cox70b814e2008-05-19 14:08:55 +0100244static long sh_wdt_ioctl(struct file *file, unsigned int cmd,
245 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246{
Paul Mundt8f5585e2010-05-25 18:31:12 +0900247 struct sh_wdt *wdt = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 int new_heartbeat;
249 int options, retval = -EINVAL;
250
251 switch (cmd) {
Alan Cox70b814e2008-05-19 14:08:55 +0100252 case WDIOC_GETSUPPORT:
253 return copy_to_user((struct watchdog_info *)arg,
254 &sh_wdt_info, sizeof(sh_wdt_info)) ? -EFAULT : 0;
255 case WDIOC_GETSTATUS:
256 case WDIOC_GETBOOTSTATUS:
257 return put_user(0, (int *)arg);
Alan Cox70b814e2008-05-19 14:08:55 +0100258 case WDIOC_SETOPTIONS:
259 if (get_user(options, (int *)arg))
260 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
Alan Cox70b814e2008-05-19 14:08:55 +0100262 if (options & WDIOS_DISABLECARD) {
Paul Mundt8f5585e2010-05-25 18:31:12 +0900263 sh_wdt_stop(wdt);
Alan Cox70b814e2008-05-19 14:08:55 +0100264 retval = 0;
265 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
Alan Cox70b814e2008-05-19 14:08:55 +0100267 if (options & WDIOS_ENABLECARD) {
Paul Mundt8f5585e2010-05-25 18:31:12 +0900268 sh_wdt_start(wdt);
Alan Cox70b814e2008-05-19 14:08:55 +0100269 retval = 0;
270 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
Alan Cox70b814e2008-05-19 14:08:55 +0100272 return retval;
Wim Van Sebroeck0c060902008-07-18 11:41:17 +0000273 case WDIOC_KEEPALIVE:
Paul Mundt8f5585e2010-05-25 18:31:12 +0900274 sh_wdt_keepalive(wdt);
Wim Van Sebroeck0c060902008-07-18 11:41:17 +0000275 return 0;
276 case WDIOC_SETTIMEOUT:
277 if (get_user(new_heartbeat, (int *)arg))
278 return -EFAULT;
279
280 if (sh_wdt_set_heartbeat(new_heartbeat))
281 return -EINVAL;
282
Paul Mundt8f5585e2010-05-25 18:31:12 +0900283 sh_wdt_keepalive(wdt);
Wim Van Sebroeck0c060902008-07-18 11:41:17 +0000284 /* Fall */
285 case WDIOC_GETTIMEOUT:
286 return put_user(heartbeat, (int *)arg);
Alan Cox70b814e2008-05-19 14:08:55 +0100287 default:
288 return -ENOTTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 return 0;
291}
292
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293static int sh_wdt_notify_sys(struct notifier_block *this,
294 unsigned long code, void *unused)
295{
Paul Mundt8f5585e2010-05-25 18:31:12 +0900296 struct sh_wdt *wdt = platform_get_drvdata(sh_wdt_dev);
297
Paul Mundte4c2cfe2006-09-27 12:31:01 +0900298 if (code == SYS_DOWN || code == SYS_HALT)
Paul Mundt8f5585e2010-05-25 18:31:12 +0900299 sh_wdt_stop(wdt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
301 return NOTIFY_DONE;
302}
303
Arjan van de Ven62322d22006-07-03 00:24:21 -0700304static const struct file_operations sh_wdt_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 .owner = THIS_MODULE,
306 .llseek = no_llseek,
307 .write = sh_wdt_write,
Alan Cox70b814e2008-05-19 14:08:55 +0100308 .unlocked_ioctl = sh_wdt_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 .open = sh_wdt_open,
310 .release = sh_wdt_close,
311};
312
Alan Cox70b814e2008-05-19 14:08:55 +0100313static const struct watchdog_info sh_wdt_info = {
Paul Mundte4c2cfe2006-09-27 12:31:01 +0900314 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
315 WDIOF_MAGICCLOSE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 .firmware_version = 1,
317 .identity = "SH WDT",
318};
319
320static struct notifier_block sh_wdt_notifier = {
321 .notifier_call = sh_wdt_notify_sys,
322};
323
324static struct miscdevice sh_wdt_miscdev = {
325 .minor = WATCHDOG_MINOR,
326 .name = "watchdog",
327 .fops = &sh_wdt_fops,
328};
329
Paul Mundt8f5585e2010-05-25 18:31:12 +0900330static int __devinit sh_wdt_probe(struct platform_device *pdev)
331{
332 struct sh_wdt *wdt;
333 struct resource *res;
334 int rc;
335
336 /*
337 * As this driver only covers the global watchdog case, reject
338 * any attempts to register per-CPU watchdogs.
339 */
340 if (pdev->id != -1)
341 return -EINVAL;
342
343 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
344 if (unlikely(!res))
345 return -EINVAL;
346
347 if (!devm_request_mem_region(&pdev->dev, res->start,
348 resource_size(res), DRV_NAME))
349 return -EBUSY;
350
351 wdt = devm_kzalloc(&pdev->dev, sizeof(struct sh_wdt), GFP_KERNEL);
352 if (unlikely(!wdt)) {
353 rc = -ENOMEM;
354 goto out_release;
355 }
356
357 wdt->dev = &pdev->dev;
358
359 wdt->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
360 if (unlikely(!wdt->base)) {
361 rc = -ENXIO;
362 goto out_err;
363 }
364
365 rc = register_reboot_notifier(&sh_wdt_notifier);
366 if (unlikely(rc)) {
367 dev_err(&pdev->dev,
368 "Can't register reboot notifier (err=%d)\n", rc);
369 goto out_unmap;
370 }
371
372 sh_wdt_miscdev.parent = wdt->dev;
373
374 rc = misc_register(&sh_wdt_miscdev);
375 if (unlikely(rc)) {
376 dev_err(&pdev->dev,
377 "Can't register miscdev on minor=%d (err=%d)\n",
378 sh_wdt_miscdev.minor, rc);
379 goto out_unreg;
380 }
381
382 init_timer(&wdt->timer);
383 wdt->timer.function = sh_wdt_ping;
384 wdt->timer.data = (unsigned long)wdt;
385 wdt->timer.expires = next_ping_period(clock_division_ratio);
386
387 platform_set_drvdata(pdev, wdt);
388 sh_wdt_dev = pdev;
389
390 dev_info(&pdev->dev, "initialized.\n");
391
392 return 0;
393
394out_unreg:
395 unregister_reboot_notifier(&sh_wdt_notifier);
396out_unmap:
397 devm_iounmap(&pdev->dev, wdt->base);
398out_err:
399 devm_kfree(&pdev->dev, wdt);
400out_release:
401 devm_release_mem_region(&pdev->dev, res->start, resource_size(res));
402
403 return rc;
404}
405
406static int __devexit sh_wdt_remove(struct platform_device *pdev)
407{
408 struct sh_wdt *wdt = platform_get_drvdata(pdev);
409 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
410
411 platform_set_drvdata(pdev, NULL);
412
413 misc_deregister(&sh_wdt_miscdev);
414
415 sh_wdt_dev = NULL;
416
417 unregister_reboot_notifier(&sh_wdt_notifier);
418 devm_release_mem_region(&pdev->dev, res->start, resource_size(res));
419 devm_iounmap(&pdev->dev, wdt->base);
420 devm_kfree(&pdev->dev, wdt);
421
422 return 0;
423}
424
425static struct platform_driver sh_wdt_driver = {
426 .driver = {
427 .name = DRV_NAME,
428 .owner = THIS_MODULE,
429 },
430
431 .probe = sh_wdt_probe,
432 .remove = __devexit_p(sh_wdt_remove),
433};
434
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435static int __init sh_wdt_init(void)
436{
437 int rc;
438
Paul Mundt8f5585e2010-05-25 18:31:12 +0900439 if (unlikely(clock_division_ratio < 0x5 ||
440 clock_division_ratio > 0x7)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 clock_division_ratio = WTCSR_CKS_4096;
Paul Mundt8f5585e2010-05-25 18:31:12 +0900442
443 pr_info("%s: divisor must be 0x5<=x<=0x7, using %d\n",
444 DRV_NAME, clock_division_ratio);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 }
446
Paul Mundte4c2cfe2006-09-27 12:31:01 +0900447 rc = sh_wdt_set_heartbeat(heartbeat);
448 if (unlikely(rc)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 heartbeat = WATCHDOG_HEARTBEAT;
Paul Mundt8f5585e2010-05-25 18:31:12 +0900450
451 pr_info("%s: heartbeat value must be 1<=x<=3600, using %d\n",
452 DRV_NAME, heartbeat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 }
454
Paul Mundt8f5585e2010-05-25 18:31:12 +0900455 pr_info("%s: configured with heartbeat=%d sec (nowayout=%d)\n",
456 DRV_NAME, heartbeat, nowayout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457
Paul Mundt8f5585e2010-05-25 18:31:12 +0900458 return platform_driver_register(&sh_wdt_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459}
460
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461static void __exit sh_wdt_exit(void)
462{
Paul Mundt8f5585e2010-05-25 18:31:12 +0900463 platform_driver_unregister(&sh_wdt_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464}
Paul Mundt8f5585e2010-05-25 18:31:12 +0900465module_init(sh_wdt_init);
466module_exit(sh_wdt_exit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
468MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>");
469MODULE_DESCRIPTION("SuperH watchdog driver");
470MODULE_LICENSE("GPL");
Paul Mundt8f5585e2010-05-25 18:31:12 +0900471MODULE_ALIAS("platform:" DRV_NAME);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
473
474module_param(clock_division_ratio, int, 0);
Wim Van Sebroecka77dba72009-04-14 20:20:07 +0000475MODULE_PARM_DESC(clock_division_ratio,
476 "Clock division ratio. Valid ranges are from 0x5 (1.31ms) "
Randy Dunlap76550d32010-05-01 09:46:15 -0700477 "to 0x7 (5.25ms). (default=" __MODULE_STRING(WTCSR_CKS_4096) ")");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
479module_param(heartbeat, int, 0);
Alan Cox70b814e2008-05-19 14:08:55 +0100480MODULE_PARM_DESC(heartbeat,
481 "Watchdog heartbeat in seconds. (1 <= heartbeat <= 3600, default="
482 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
484module_param(nowayout, int, 0);
Alan Cox70b814e2008-05-19 14:08:55 +0100485MODULE_PARM_DESC(nowayout,
486 "Watchdog cannot be stopped once started (default="
487 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");