blob: 4bc3744e14e4bf54f80a84585d3626d64635ba21 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* linux/drivers/char/watchdog/s3c2410_wdt.c
2 *
3 * Copyright (c) 2004 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 *
6 * S3C2410 Watchdog Timer Support
7 *
8 * Based on, softdog.c by Alan Cox,
Alan Cox29fa0582008-10-27 15:17:56 +00009 * (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 *
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Linus Torvalds1da177e2005-04-16 15:20:36 -070024*/
25
26#include <linux/module.h>
27#include <linux/moduleparam.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/types.h>
29#include <linux/timer.h>
Wolfram Sang25dc46e2011-09-26 15:40:14 +020030#include <linux/miscdevice.h> /* for MODULE_ALIAS_MISCDEV */
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/watchdog.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/init.h>
Russell Kingd052d1b2005-10-29 19:07:23 +010033#include <linux/platform_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/interrupt.h>
Russell Kingf8ce2542006-01-07 16:15:52 +000035#include <linux/clk.h>
Alan Cox41dc8b72008-08-04 17:54:46 +010036#include <linux/uaccess.h>
37#include <linux/io.h>
Ben Dookse02f8382009-10-30 00:30:25 +000038#include <linux/cpufreq.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090039#include <linux/slab.h>
Wolfram Sang25dc46e2011-09-26 15:40:14 +020040#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Russell Kinga09e64f2008-08-05 16:14:15 +010042#include <mach/map.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
Ben Dooksb4307082007-07-24 13:28:01 +010044#undef S3C_VA_WATCHDOG
45#define S3C_VA_WATCHDOG (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Ben Dooks180ee702008-10-30 10:14:32 +000047#include <plat/regs-watchdog.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49#define PFX "s3c2410-wdt: "
50
51#define CONFIG_S3C2410_WATCHDOG_ATBOOT (0)
52#define CONFIG_S3C2410_WATCHDOG_DEFAULT_TIME (15)
53
Ben Dooks25ff3782006-09-06 12:24:35 +010054static int nowayout = WATCHDOG_NOWAYOUT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070055static int tmr_margin = CONFIG_S3C2410_WATCHDOG_DEFAULT_TIME;
56static int tmr_atboot = CONFIG_S3C2410_WATCHDOG_ATBOOT;
Alan Cox41dc8b72008-08-04 17:54:46 +010057static int soft_noboot;
58static int debug;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
60module_param(tmr_margin, int, 0);
61module_param(tmr_atboot, int, 0);
62module_param(nowayout, int, 0);
63module_param(soft_noboot, int, 0);
64module_param(debug, int, 0);
65
Randy Dunlap76550d32010-05-01 09:46:15 -070066MODULE_PARM_DESC(tmr_margin, "Watchdog tmr_margin in seconds. (default="
Alan Cox41dc8b72008-08-04 17:54:46 +010067 __MODULE_STRING(CONFIG_S3C2410_WATCHDOG_DEFAULT_TIME) ")");
68MODULE_PARM_DESC(tmr_atboot,
69 "Watchdog is started at boot time if set to 1, default="
70 __MODULE_STRING(CONFIG_S3C2410_WATCHDOG_ATBOOT));
71MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
72 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
Wim Van Sebroecka77dba72009-04-14 20:20:07 +000073MODULE_PARM_DESC(soft_noboot, "Watchdog action, set to 1 to ignore reboots, "
Randy Dunlap76550d32010-05-01 09:46:15 -070074 "0 to reboot (default 0)");
75MODULE_PARM_DESC(debug, "Watchdog debug, set to >1 for debug (default 0)");
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Ben Dookse8ef92b2007-06-14 12:08:55 +010077static struct device *wdt_dev; /* platform device attached to */
Linus Torvalds1da177e2005-04-16 15:20:36 -070078static struct resource *wdt_mem;
79static struct resource *wdt_irq;
80static struct clk *wdt_clock;
81static void __iomem *wdt_base;
82static unsigned int wdt_count;
Alan Cox41dc8b72008-08-04 17:54:46 +010083static DEFINE_SPINLOCK(wdt_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
85/* watchdog control routines */
86
87#define DBG(msg...) do { \
88 if (debug) \
89 printk(KERN_INFO msg); \
Alan Cox41dc8b72008-08-04 17:54:46 +010090 } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
92/* functions */
93
Wolfram Sang25dc46e2011-09-26 15:40:14 +020094static int s3c2410wdt_keepalive(struct watchdog_device *wdd)
Linus Torvalds1da177e2005-04-16 15:20:36 -070095{
Alan Cox41dc8b72008-08-04 17:54:46 +010096 spin_lock(&wdt_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 writel(wdt_count, wdt_base + S3C2410_WTCNT);
Alan Cox41dc8b72008-08-04 17:54:46 +010098 spin_unlock(&wdt_lock);
Wolfram Sang25dc46e2011-09-26 15:40:14 +020099
100 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101}
102
Alan Cox41dc8b72008-08-04 17:54:46 +0100103static void __s3c2410wdt_stop(void)
104{
105 unsigned long wtcon;
106
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 wtcon = readl(wdt_base + S3C2410_WTCON);
108 wtcon &= ~(S3C2410_WTCON_ENABLE | S3C2410_WTCON_RSTEN);
109 writel(wtcon, wdt_base + S3C2410_WTCON);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110}
111
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200112static int s3c2410wdt_stop(struct watchdog_device *wdd)
Alan Cox41dc8b72008-08-04 17:54:46 +0100113{
114 spin_lock(&wdt_lock);
115 __s3c2410wdt_stop();
116 spin_unlock(&wdt_lock);
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200117
118 return 0;
Alan Cox41dc8b72008-08-04 17:54:46 +0100119}
120
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200121static int s3c2410wdt_start(struct watchdog_device *wdd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122{
123 unsigned long wtcon;
124
Alan Cox41dc8b72008-08-04 17:54:46 +0100125 spin_lock(&wdt_lock);
126
127 __s3c2410wdt_stop();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
129 wtcon = readl(wdt_base + S3C2410_WTCON);
130 wtcon |= S3C2410_WTCON_ENABLE | S3C2410_WTCON_DIV128;
131
132 if (soft_noboot) {
133 wtcon |= S3C2410_WTCON_INTEN;
134 wtcon &= ~S3C2410_WTCON_RSTEN;
135 } else {
136 wtcon &= ~S3C2410_WTCON_INTEN;
137 wtcon |= S3C2410_WTCON_RSTEN;
138 }
139
140 DBG("%s: wdt_count=0x%08x, wtcon=%08lx\n",
Harvey Harrisonfa9363c2008-03-05 18:24:58 -0800141 __func__, wdt_count, wtcon);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
143 writel(wdt_count, wdt_base + S3C2410_WTDAT);
144 writel(wdt_count, wdt_base + S3C2410_WTCNT);
145 writel(wtcon, wdt_base + S3C2410_WTCON);
Alan Cox41dc8b72008-08-04 17:54:46 +0100146 spin_unlock(&wdt_lock);
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200147
148 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149}
150
Ben Dookse02f8382009-10-30 00:30:25 +0000151static inline int s3c2410wdt_is_running(void)
152{
153 return readl(wdt_base + S3C2410_WTCON) & S3C2410_WTCON_ENABLE;
154}
155
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200156static int s3c2410wdt_set_heartbeat(struct watchdog_device *wdd, unsigned timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157{
Ben Dookse02f8382009-10-30 00:30:25 +0000158 unsigned long freq = clk_get_rate(wdt_clock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 unsigned int count;
160 unsigned int divisor = 1;
161 unsigned long wtcon;
162
163 if (timeout < 1)
164 return -EINVAL;
165
166 freq /= 128;
167 count = timeout * freq;
168
Ben Dookse02f8382009-10-30 00:30:25 +0000169 DBG("%s: count=%d, timeout=%d, freq=%lu\n",
Harvey Harrisonfa9363c2008-03-05 18:24:58 -0800170 __func__, count, timeout, freq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
172 /* if the count is bigger than the watchdog register,
173 then work out what we need to do (and if) we can
174 actually make this value
175 */
176
177 if (count >= 0x10000) {
178 for (divisor = 1; divisor <= 0x100; divisor++) {
179 if ((count / divisor) < 0x10000)
180 break;
181 }
182
183 if ((count / divisor) >= 0x10000) {
Ben Dookse8ef92b2007-06-14 12:08:55 +0100184 dev_err(wdt_dev, "timeout %d too big\n", timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 return -EINVAL;
186 }
187 }
188
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 DBG("%s: timeout=%d, divisor=%d, count=%d (%08x)\n",
Harvey Harrisonfa9363c2008-03-05 18:24:58 -0800190 __func__, timeout, divisor, count, count/divisor);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
192 count /= divisor;
193 wdt_count = count;
194
195 /* update the pre-scaler */
196 wtcon = readl(wdt_base + S3C2410_WTCON);
197 wtcon &= ~S3C2410_WTCON_PRESCALE_MASK;
198 wtcon |= S3C2410_WTCON_PRESCALE(divisor-1);
199
200 writel(count, wdt_base + S3C2410_WTDAT);
201 writel(wtcon, wdt_base + S3C2410_WTCON);
202
203 return 0;
204}
205
Wim Van Sebroecka77dba72009-04-14 20:20:07 +0000206#define OPTIONS (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
Alan Cox41dc8b72008-08-04 17:54:46 +0100208static const struct watchdog_info s3c2410_wdt_ident = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 .options = OPTIONS,
210 .firmware_version = 0,
211 .identity = "S3C2410 Watchdog",
212};
213
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200214static struct watchdog_ops s3c2410wdt_ops = {
215 .owner = THIS_MODULE,
216 .start = s3c2410wdt_start,
217 .stop = s3c2410wdt_stop,
218 .ping = s3c2410wdt_keepalive,
219 .set_timeout = s3c2410wdt_set_heartbeat,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220};
221
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200222static struct watchdog_device s3c2410_wdd = {
223 .info = &s3c2410_wdt_ident,
224 .ops = &s3c2410wdt_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225};
226
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227/* interrupt handler code */
228
David Howells7d12e782006-10-05 14:55:46 +0100229static irqreturn_t s3c2410wdt_irq(int irqno, void *param)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230{
Ben Dookse8ef92b2007-06-14 12:08:55 +0100231 dev_info(wdt_dev, "watchdog timer expired (irq)\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200233 s3c2410wdt_keepalive(&s3c2410_wdd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 return IRQ_HANDLED;
235}
Ben Dookse02f8382009-10-30 00:30:25 +0000236
237
238#ifdef CONFIG_CPU_FREQ
239
240static int s3c2410wdt_cpufreq_transition(struct notifier_block *nb,
241 unsigned long val, void *data)
242{
243 int ret;
244
245 if (!s3c2410wdt_is_running())
246 goto done;
247
248 if (val == CPUFREQ_PRECHANGE) {
249 /* To ensure that over the change we don't cause the
250 * watchdog to trigger, we perform an keep-alive if
251 * the watchdog is running.
252 */
253
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200254 s3c2410wdt_keepalive(&s3c2410_wdd);
Ben Dookse02f8382009-10-30 00:30:25 +0000255 } else if (val == CPUFREQ_POSTCHANGE) {
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200256 s3c2410wdt_stop(&s3c2410_wdd);
Ben Dookse02f8382009-10-30 00:30:25 +0000257
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200258 ret = s3c2410wdt_set_heartbeat(&s3c2410_wdd, s3c2410_wdd.timeout);
Ben Dookse02f8382009-10-30 00:30:25 +0000259
260 if (ret >= 0)
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200261 s3c2410wdt_start(&s3c2410_wdd);
Ben Dookse02f8382009-10-30 00:30:25 +0000262 else
263 goto err;
264 }
265
266done:
267 return 0;
268
269 err:
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200270 dev_err(wdt_dev, "cannot set new value for timeout %d\n",
271 s3c2410_wdd.timeout);
Ben Dookse02f8382009-10-30 00:30:25 +0000272 return ret;
273}
274
275static struct notifier_block s3c2410wdt_cpufreq_transition_nb = {
276 .notifier_call = s3c2410wdt_cpufreq_transition,
277};
278
279static inline int s3c2410wdt_cpufreq_register(void)
280{
281 return cpufreq_register_notifier(&s3c2410wdt_cpufreq_transition_nb,
282 CPUFREQ_TRANSITION_NOTIFIER);
283}
284
285static inline void s3c2410wdt_cpufreq_deregister(void)
286{
287 cpufreq_unregister_notifier(&s3c2410wdt_cpufreq_transition_nb,
288 CPUFREQ_TRANSITION_NOTIFIER);
289}
290
291#else
292static inline int s3c2410wdt_cpufreq_register(void)
293{
294 return 0;
295}
296
297static inline void s3c2410wdt_cpufreq_deregister(void)
298{
299}
300#endif
301
Wim Van Sebroecka77dba72009-04-14 20:20:07 +0000302static int __devinit s3c2410wdt_probe(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303{
Ben Dookse8ef92b2007-06-14 12:08:55 +0100304 struct device *dev;
Ben Dooks46b814d2007-06-14 12:08:54 +0100305 unsigned int wtcon;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 int started = 0;
307 int ret;
308 int size;
309
Harvey Harrisonfa9363c2008-03-05 18:24:58 -0800310 DBG("%s: probe=%p\n", __func__, pdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
Ben Dookse8ef92b2007-06-14 12:08:55 +0100312 dev = &pdev->dev;
313 wdt_dev = &pdev->dev;
314
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 /* get the memory region for the watchdog timer */
316
Julia Lawallf72401e2011-02-26 17:34:38 +0100317 wdt_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
318 if (wdt_mem == NULL) {
Ben Dookse8ef92b2007-06-14 12:08:55 +0100319 dev_err(dev, "no memory resource specified\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 return -ENOENT;
321 }
322
Julia Lawallf72401e2011-02-26 17:34:38 +0100323 size = resource_size(wdt_mem);
324 if (!request_mem_region(wdt_mem->start, size, pdev->name)) {
Ben Dookse8ef92b2007-06-14 12:08:55 +0100325 dev_err(dev, "failed to get memory region\n");
Banajit Goswami100fb762010-05-20 11:58:25 +0100326 return -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 }
328
Julia Lawallf72401e2011-02-26 17:34:38 +0100329 wdt_base = ioremap(wdt_mem->start, size);
Ben Dooksb4253f82008-06-22 22:36:49 +0100330 if (wdt_base == NULL) {
Ben Dookse8ef92b2007-06-14 12:08:55 +0100331 dev_err(dev, "failed to ioremap() region\n");
Ben Dooks0b6dd8a2006-12-18 10:31:32 +0000332 ret = -EINVAL;
333 goto err_req;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 }
335
336 DBG("probe: mapped wdt_base=%p\n", wdt_base);
337
Arnaud Patard62be07412007-05-05 15:53:15 +0200338 wdt_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
339 if (wdt_irq == NULL) {
Ben Dookse8ef92b2007-06-14 12:08:55 +0100340 dev_err(dev, "no irq resource specified\n");
Ben Dooks0b6dd8a2006-12-18 10:31:32 +0000341 ret = -ENOENT;
342 goto err_map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 }
344
Arnaud Patard62be07412007-05-05 15:53:15 +0200345 ret = request_irq(wdt_irq->start, s3c2410wdt_irq, 0, pdev->name, pdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 if (ret != 0) {
Ben Dookse8ef92b2007-06-14 12:08:55 +0100347 dev_err(dev, "failed to install irq (%d)\n", ret);
Ben Dooks0b6dd8a2006-12-18 10:31:32 +0000348 goto err_map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 }
350
Russell King3ae5eae2005-11-09 22:32:44 +0000351 wdt_clock = clk_get(&pdev->dev, "watchdog");
Akinobu Mita9cd44612006-12-19 17:51:44 +0900352 if (IS_ERR(wdt_clock)) {
Ben Dookse8ef92b2007-06-14 12:08:55 +0100353 dev_err(dev, "failed to find watchdog clock source\n");
Akinobu Mita9cd44612006-12-19 17:51:44 +0900354 ret = PTR_ERR(wdt_clock);
Ben Dooks0b6dd8a2006-12-18 10:31:32 +0000355 goto err_irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 }
357
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 clk_enable(wdt_clock);
359
Ben Dookse02f8382009-10-30 00:30:25 +0000360 if (s3c2410wdt_cpufreq_register() < 0) {
361 printk(KERN_ERR PFX "failed to register cpufreq\n");
362 goto err_clk;
363 }
364
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 /* see if we can actually set the requested timer margin, and if
366 * not, try the default value */
367
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200368 if (s3c2410wdt_set_heartbeat(&s3c2410_wdd, tmr_margin)) {
369 started = s3c2410wdt_set_heartbeat(&s3c2410_wdd,
Alan Cox41dc8b72008-08-04 17:54:46 +0100370 CONFIG_S3C2410_WATCHDOG_DEFAULT_TIME);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
Alan Cox41dc8b72008-08-04 17:54:46 +0100372 if (started == 0)
373 dev_info(dev,
374 "tmr_margin value out of range, default %d used\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 CONFIG_S3C2410_WATCHDOG_DEFAULT_TIME);
Alan Cox41dc8b72008-08-04 17:54:46 +0100376 else
Wim Van Sebroecka77dba72009-04-14 20:20:07 +0000377 dev_info(dev, "default timer value is out of range, "
378 "cannot start\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 }
380
Wim Van Sebroeckff0b3cd2011-11-29 16:24:16 +0100381 watchdog_set_nowayout(&s3c2410_wdd, nowayout);
382
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200383 ret = watchdog_register_device(&s3c2410_wdd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 if (ret) {
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200385 dev_err(dev, "cannot register watchdog (%d)\n", ret);
Ben Dookse02f8382009-10-30 00:30:25 +0000386 goto err_cpufreq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 }
388
389 if (tmr_atboot && started == 0) {
Ben Dookse8ef92b2007-06-14 12:08:55 +0100390 dev_info(dev, "starting watchdog timer\n");
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200391 s3c2410wdt_start(&s3c2410_wdd);
Ben Dooks655516c2006-04-19 23:02:56 +0100392 } else if (!tmr_atboot) {
393 /* if we're not enabling the watchdog, then ensure it is
394 * disabled if it has been left running from the bootloader
395 * or other source */
396
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200397 s3c2410wdt_stop(&s3c2410_wdd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 }
399
Ben Dooks46b814d2007-06-14 12:08:54 +0100400 /* print out a statement of readiness */
401
402 wtcon = readl(wdt_base + S3C2410_WTCON);
403
Ben Dookse8ef92b2007-06-14 12:08:55 +0100404 dev_info(dev, "watchdog %sactive, reset %sabled, irq %sabled\n",
Ben Dooks46b814d2007-06-14 12:08:54 +0100405 (wtcon & S3C2410_WTCON_ENABLE) ? "" : "in",
Dmitry Artamonow20403e82011-11-16 12:46:13 +0400406 (wtcon & S3C2410_WTCON_RSTEN) ? "en" : "dis",
407 (wtcon & S3C2410_WTCON_INTEN) ? "en" : "dis");
Alan Cox41dc8b72008-08-04 17:54:46 +0100408
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 return 0;
Ben Dooks0b6dd8a2006-12-18 10:31:32 +0000410
Ben Dookse02f8382009-10-30 00:30:25 +0000411 err_cpufreq:
412 s3c2410wdt_cpufreq_deregister();
413
Ben Dooks0b6dd8a2006-12-18 10:31:32 +0000414 err_clk:
415 clk_disable(wdt_clock);
416 clk_put(wdt_clock);
417
418 err_irq:
419 free_irq(wdt_irq->start, pdev);
420
421 err_map:
422 iounmap(wdt_base);
423
424 err_req:
Julia Lawallf72401e2011-02-26 17:34:38 +0100425 release_mem_region(wdt_mem->start, size);
426 wdt_mem = NULL;
Ben Dooks0b6dd8a2006-12-18 10:31:32 +0000427
428 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429}
430
Wim Van Sebroecka77dba72009-04-14 20:20:07 +0000431static int __devexit s3c2410wdt_remove(struct platform_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432{
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200433 watchdog_unregister_device(&s3c2410_wdd);
Wim Van Sebroeck9a372562010-05-21 08:11:42 +0000434
Ben Dookse02f8382009-10-30 00:30:25 +0000435 s3c2410wdt_cpufreq_deregister();
436
Ben Dooks0b6dd8a2006-12-18 10:31:32 +0000437 clk_disable(wdt_clock);
438 clk_put(wdt_clock);
439 wdt_clock = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
Wim Van Sebroeck9a372562010-05-21 08:11:42 +0000441 free_irq(wdt_irq->start, dev);
442 wdt_irq = NULL;
443
Amol Lade34477e2006-10-06 13:41:12 -0700444 iounmap(wdt_base);
Wim Van Sebroeck9a372562010-05-21 08:11:42 +0000445
Julia Lawallf72401e2011-02-26 17:34:38 +0100446 release_mem_region(wdt_mem->start, resource_size(wdt_mem));
Wim Van Sebroeck9a372562010-05-21 08:11:42 +0000447 wdt_mem = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 return 0;
449}
450
Russell King3ae5eae2005-11-09 22:32:44 +0000451static void s3c2410wdt_shutdown(struct platform_device *dev)
Ben Dooks94f1e9f2005-08-17 09:04:52 +0200452{
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200453 s3c2410wdt_stop(&s3c2410_wdd);
Ben Dooks94f1e9f2005-08-17 09:04:52 +0200454}
455
Ben Dooksaf4bb822005-08-17 09:03:23 +0200456#ifdef CONFIG_PM
457
458static unsigned long wtcon_save;
459static unsigned long wtdat_save;
460
Russell King3ae5eae2005-11-09 22:32:44 +0000461static int s3c2410wdt_suspend(struct platform_device *dev, pm_message_t state)
Ben Dooksaf4bb822005-08-17 09:03:23 +0200462{
Russell King9480e302005-10-28 09:52:56 -0700463 /* Save watchdog state, and turn it off. */
464 wtcon_save = readl(wdt_base + S3C2410_WTCON);
465 wtdat_save = readl(wdt_base + S3C2410_WTDAT);
Ben Dooksaf4bb822005-08-17 09:03:23 +0200466
Russell King9480e302005-10-28 09:52:56 -0700467 /* Note that WTCNT doesn't need to be saved. */
Wolfram Sang25dc46e2011-09-26 15:40:14 +0200468 s3c2410wdt_stop(&s3c2410_wdd);
Ben Dooksaf4bb822005-08-17 09:03:23 +0200469
470 return 0;
471}
472
Russell King3ae5eae2005-11-09 22:32:44 +0000473static int s3c2410wdt_resume(struct platform_device *dev)
Ben Dooksaf4bb822005-08-17 09:03:23 +0200474{
Russell King9480e302005-10-28 09:52:56 -0700475 /* Restore watchdog state. */
Ben Dooksaf4bb822005-08-17 09:03:23 +0200476
Russell King9480e302005-10-28 09:52:56 -0700477 writel(wtdat_save, wdt_base + S3C2410_WTDAT);
478 writel(wtdat_save, wdt_base + S3C2410_WTCNT); /* Reset count */
479 writel(wtcon_save, wdt_base + S3C2410_WTCON);
Ben Dooksaf4bb822005-08-17 09:03:23 +0200480
Russell King9480e302005-10-28 09:52:56 -0700481 printk(KERN_INFO PFX "watchdog %sabled\n",
482 (wtcon_save & S3C2410_WTCON_ENABLE) ? "en" : "dis");
Ben Dooksaf4bb822005-08-17 09:03:23 +0200483
484 return 0;
485}
486
487#else
488#define s3c2410wdt_suspend NULL
489#define s3c2410wdt_resume NULL
490#endif /* CONFIG_PM */
491
Thomas Abraham9487a9c2011-06-22 15:24:32 +0530492#ifdef CONFIG_OF
493static const struct of_device_id s3c2410_wdt_match[] = {
494 { .compatible = "samsung,s3c2410-wdt" },
495 {},
496};
497MODULE_DEVICE_TABLE(of, s3c2410_wdt_match);
498#else
499#define s3c2410_wdt_match NULL
500#endif
Ben Dooksaf4bb822005-08-17 09:03:23 +0200501
Russell King3ae5eae2005-11-09 22:32:44 +0000502static struct platform_driver s3c2410wdt_driver = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 .probe = s3c2410wdt_probe,
Wim Van Sebroecka77dba72009-04-14 20:20:07 +0000504 .remove = __devexit_p(s3c2410wdt_remove),
Ben Dooks94f1e9f2005-08-17 09:04:52 +0200505 .shutdown = s3c2410wdt_shutdown,
Ben Dooksaf4bb822005-08-17 09:03:23 +0200506 .suspend = s3c2410wdt_suspend,
507 .resume = s3c2410wdt_resume,
Russell King3ae5eae2005-11-09 22:32:44 +0000508 .driver = {
509 .owner = THIS_MODULE,
510 .name = "s3c2410-wdt",
Thomas Abraham9487a9c2011-06-22 15:24:32 +0530511 .of_match_table = s3c2410_wdt_match,
Russell King3ae5eae2005-11-09 22:32:44 +0000512 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513};
514
515
Alan Cox41dc8b72008-08-04 17:54:46 +0100516static char banner[] __initdata =
517 KERN_INFO "S3C2410 Watchdog Timer, (c) 2004 Simtec Electronics\n";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
519static int __init watchdog_init(void)
520{
521 printk(banner);
Russell King3ae5eae2005-11-09 22:32:44 +0000522 return platform_driver_register(&s3c2410wdt_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523}
524
525static void __exit watchdog_exit(void)
526{
Russell King3ae5eae2005-11-09 22:32:44 +0000527 platform_driver_unregister(&s3c2410wdt_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528}
529
530module_init(watchdog_init);
531module_exit(watchdog_exit);
532
Ben Dooksaf4bb822005-08-17 09:03:23 +0200533MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>, "
534 "Dimitry Andric <dimitry.andric@tomtom.com>");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535MODULE_DESCRIPTION("S3C2410 Watchdog Device Driver");
536MODULE_LICENSE("GPL");
537MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
Kay Sieversf37d1932008-04-10 21:29:23 -0700538MODULE_ALIAS("platform:s3c2410-wdt");