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Wolfram Sangbb2fd8a2010-04-29 10:03:17 +02001/*
2 * Watchdog driver for IMX2 and later processors
3 *
4 * Copyright (C) 2010 Wolfram Sang, Pengutronix e.K. <w.sang@pengutronix.de>
Anson Huang1a9c5ef2014-01-13 19:58:34 +08005 * Copyright (C) 2014 Freescale Semiconductor, Inc.
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +02006 *
7 * some parts adapted by similar drivers from Darius Augulis and Vladimir
8 * Zapolskiy, additional improvements by Wim Van Sebroeck.
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published by
12 * the Free Software Foundation.
13 *
14 * NOTE: MX1 has a slightly different Watchdog than MX2 and later:
15 *
16 * MX1: MX2+:
17 * ---- -----
18 * Registers: 32-bit 16-bit
19 * Stopable timer: Yes No
20 * Need to enable clk: No Yes
21 * Halt on suspend: Manual Can be automatic
22 */
23
Xiubo Li30cb0422014-04-04 09:33:24 +080024#include <linux/clk.h>
Jingchang Lu334a9d82014-09-12 15:24:36 +080025#include <linux/delay.h>
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +020026#include <linux/init.h>
Xiubo Li30cb0422014-04-04 09:33:24 +080027#include <linux/io.h>
28#include <linux/jiffies.h>
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +020029#include <linux/kernel.h>
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +020030#include <linux/module.h>
31#include <linux/moduleparam.h>
Jingchang Lu334a9d82014-09-12 15:24:36 +080032#include <linux/notifier.h>
Xiubo Lif728f4b2014-06-03 10:45:14 +080033#include <linux/of_address.h>
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +020034#include <linux/platform_device.h>
Jingchang Lu334a9d82014-09-12 15:24:36 +080035#include <linux/reboot.h>
Xiubo Lia7977002014-04-04 09:33:25 +080036#include <linux/regmap.h>
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +020037#include <linux/timer.h>
Xiubo Li30cb0422014-04-04 09:33:24 +080038#include <linux/watchdog.h>
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +020039
40#define DRIVER_NAME "imx2-wdt"
41
42#define IMX2_WDT_WCR 0x00 /* Control Register */
43#define IMX2_WDT_WCR_WT (0xFF << 8) /* -> Watchdog Timeout Field */
44#define IMX2_WDT_WCR_WRE (1 << 3) /* -> WDOG Reset Enable */
45#define IMX2_WDT_WCR_WDE (1 << 2) /* -> Watchdog Enable */
Anson Huang1a9c5ef2014-01-13 19:58:34 +080046#define IMX2_WDT_WCR_WDZST (1 << 0) /* -> Watchdog timer Suspend */
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +020047
48#define IMX2_WDT_WSR 0x02 /* Service Register */
49#define IMX2_WDT_SEQ1 0x5555 /* -> service sequence 1 */
50#define IMX2_WDT_SEQ2 0xAAAA /* -> service sequence 2 */
51
Oskar Schirmer474ef122012-02-16 12:17:45 +000052#define IMX2_WDT_WRSR 0x04 /* Reset Status Register */
53#define IMX2_WDT_WRSR_TOUT (1 << 1) /* -> Reset due to Timeout */
54
Markus Pargmann5fe65ce2014-09-08 09:14:07 +020055#define IMX2_WDT_WMCR 0x08 /* Misc Register */
56
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +020057#define IMX2_WDT_MAX_TIME 128
58#define IMX2_WDT_DEFAULT_TIME 60 /* in seconds */
59
60#define WDOG_SEC_TO_COUNT(s) ((s * 2 - 1) << 8)
61
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +020062struct imx2_wdt_device {
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +020063 struct clk *clk;
Xiubo Lia7977002014-04-04 09:33:25 +080064 struct regmap *regmap;
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +020065 struct timer_list timer; /* Pings the watchdog when closed */
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +020066 struct watchdog_device wdog;
Jingchang Lu334a9d82014-09-12 15:24:36 +080067 struct notifier_block restart_handler;
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +020068};
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +020069
Wim Van Sebroeck86a1e182012-03-05 16:51:11 +010070static bool nowayout = WATCHDOG_NOWAYOUT;
71module_param(nowayout, bool, 0);
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +020072MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
73 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
74
75
76static unsigned timeout = IMX2_WDT_DEFAULT_TIME;
77module_param(timeout, uint, 0);
78MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default="
79 __MODULE_STRING(IMX2_WDT_DEFAULT_TIME) ")");
80
81static const struct watchdog_info imx2_wdt_info = {
82 .identity = "imx2+ watchdog",
83 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
84};
85
Jingchang Lu334a9d82014-09-12 15:24:36 +080086static int imx2_restart_handler(struct notifier_block *this, unsigned long mode,
87 void *cmd)
88{
89 unsigned int wcr_enable = IMX2_WDT_WCR_WDE;
90 struct imx2_wdt_device *wdev = container_of(this,
91 struct imx2_wdt_device,
92 restart_handler);
93 /* Assert SRS signal */
94 regmap_write(wdev->regmap, 0, wcr_enable);
95 /*
96 * Due to imx6q errata ERR004346 (WDOG: WDOG SRS bit requires to be
97 * written twice), we add another two writes to ensure there must be at
98 * least two writes happen in the same one 32kHz clock period. We save
99 * the target check here, since the writes shouldn't be a huge burden
100 * for other platforms.
101 */
102 regmap_write(wdev->regmap, 0, wcr_enable);
103 regmap_write(wdev->regmap, 0, wcr_enable);
104
105 /* wait for reset to assert... */
106 mdelay(500);
107
108 return NOTIFY_DONE;
109}
110
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200111static inline void imx2_wdt_setup(struct watchdog_device *wdog)
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200112{
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200113 struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
Xiubo Lia7977002014-04-04 09:33:25 +0800114 u32 val;
115
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200116 regmap_read(wdev->regmap, IMX2_WDT_WCR, &val);
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200117
Anson Huang1a9c5ef2014-01-13 19:58:34 +0800118 /* Suspend timer in low power mode, write once-only */
119 val |= IMX2_WDT_WCR_WDZST;
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200120 /* Strip the old watchdog Time-Out value */
121 val &= ~IMX2_WDT_WCR_WT;
122 /* Generate reset if WDOG times out */
123 val &= ~IMX2_WDT_WCR_WRE;
124 /* Keep Watchdog Disabled */
125 val &= ~IMX2_WDT_WCR_WDE;
126 /* Set the watchdog's Time-Out value */
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200127 val |= WDOG_SEC_TO_COUNT(wdog->timeout);
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200128
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200129 regmap_write(wdev->regmap, IMX2_WDT_WCR, val);
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200130
131 /* enable the watchdog */
132 val |= IMX2_WDT_WCR_WDE;
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200133 regmap_write(wdev->regmap, IMX2_WDT_WCR, val);
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200134}
135
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200136static inline bool imx2_wdt_is_running(struct imx2_wdt_device *wdev)
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200137{
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200138 u32 val;
139
140 regmap_read(wdev->regmap, IMX2_WDT_WCR, &val);
141
142 return val & IMX2_WDT_WCR_WDE;
143}
144
145static int imx2_wdt_ping(struct watchdog_device *wdog)
146{
147 struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
148
149 regmap_write(wdev->regmap, IMX2_WDT_WSR, IMX2_WDT_SEQ1);
150 regmap_write(wdev->regmap, IMX2_WDT_WSR, IMX2_WDT_SEQ2);
151 return 0;
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200152}
153
154static void imx2_wdt_timer_ping(unsigned long arg)
155{
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200156 struct watchdog_device *wdog = (struct watchdog_device *)arg;
157 struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
158
159 /* ping it every wdog->timeout / 2 seconds to prevent reboot */
160 imx2_wdt_ping(wdog);
161 mod_timer(&wdev->timer, jiffies + wdog->timeout * HZ / 2);
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200162}
163
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200164static int imx2_wdt_set_timeout(struct watchdog_device *wdog,
165 unsigned int new_timeout)
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200166{
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200167 struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200168
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200169 regmap_update_bits(wdev->regmap, IMX2_WDT_WCR, IMX2_WDT_WCR_WT,
Xiubo Lia7977002014-04-04 09:33:25 +0800170 WDOG_SEC_TO_COUNT(new_timeout));
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200171 return 0;
172}
173
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200174static int imx2_wdt_start(struct watchdog_device *wdog)
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200175{
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200176 struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200177
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200178 if (imx2_wdt_is_running(wdev)) {
179 /* delete the timer that pings the watchdog after close */
180 del_timer_sync(&wdev->timer);
181 imx2_wdt_set_timeout(wdog, wdog->timeout);
182 } else
183 imx2_wdt_setup(wdog);
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200184
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200185 return imx2_wdt_ping(wdog);
186}
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200187
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200188static int imx2_wdt_stop(struct watchdog_device *wdog)
189{
190 /*
191 * We don't need a clk_disable, it cannot be disabled once started.
192 * We use a timer to ping the watchdog while /dev/watchdog is closed
193 */
194 imx2_wdt_timer_ping((unsigned long)wdog);
195 return 0;
196}
Oskar Schirmer474ef122012-02-16 12:17:45 +0000197
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200198static inline void imx2_wdt_ping_if_active(struct watchdog_device *wdog)
199{
200 struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200201
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200202 if (imx2_wdt_is_running(wdev)) {
203 imx2_wdt_set_timeout(wdog, wdog->timeout);
204 imx2_wdt_timer_ping((unsigned long)wdog);
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200205 }
206}
207
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200208static struct watchdog_ops imx2_wdt_ops = {
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200209 .owner = THIS_MODULE,
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200210 .start = imx2_wdt_start,
211 .stop = imx2_wdt_stop,
212 .ping = imx2_wdt_ping,
213 .set_timeout = imx2_wdt_set_timeout,
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200214};
215
Xiubo Lia7977002014-04-04 09:33:25 +0800216static struct regmap_config imx2_wdt_regmap_config = {
217 .reg_bits = 16,
218 .reg_stride = 2,
219 .val_bits = 16,
220 .max_register = 0x8,
221};
222
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200223static int __init imx2_wdt_probe(struct platform_device *pdev)
224{
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200225 struct imx2_wdt_device *wdev;
226 struct watchdog_device *wdog;
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200227 struct resource *res;
Xiubo Lia7977002014-04-04 09:33:25 +0800228 void __iomem *base;
229 int ret;
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200230 u32 val;
231
232 wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL);
233 if (!wdev)
234 return -ENOMEM;
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200235
236 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
Xiubo Lia7977002014-04-04 09:33:25 +0800237 base = devm_ioremap_resource(&pdev->dev, res);
238 if (IS_ERR(base))
239 return PTR_ERR(base);
240
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200241 wdev->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
242 &imx2_wdt_regmap_config);
243 if (IS_ERR(wdev->regmap)) {
Xiubo Lia7977002014-04-04 09:33:25 +0800244 dev_err(&pdev->dev, "regmap init failed\n");
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200245 return PTR_ERR(wdev->regmap);
Xiubo Lia7977002014-04-04 09:33:25 +0800246 }
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200247
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200248 wdev->clk = devm_clk_get(&pdev->dev, NULL);
249 if (IS_ERR(wdev->clk)) {
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200250 dev_err(&pdev->dev, "can't get Watchdog clock\n");
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200251 return PTR_ERR(wdev->clk);
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200252 }
253
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200254 wdog = &wdev->wdog;
255 wdog->info = &imx2_wdt_info;
256 wdog->ops = &imx2_wdt_ops;
257 wdog->min_timeout = 1;
258 wdog->max_timeout = IMX2_WDT_MAX_TIME;
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200259
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200260 clk_prepare_enable(wdev->clk);
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200261
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200262 regmap_read(wdev->regmap, IMX2_WDT_WRSR, &val);
263 wdog->bootstatus = val & IMX2_WDT_WRSR_TOUT ? WDIOF_CARDRESET : 0;
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200264
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200265 wdog->timeout = clamp_t(unsigned, timeout, 1, IMX2_WDT_MAX_TIME);
266 if (wdog->timeout != timeout)
267 dev_warn(&pdev->dev, "Initial timeout out of range! Clamped from %u to %u\n",
268 timeout, wdog->timeout);
269
270 platform_set_drvdata(pdev, wdog);
271 watchdog_set_drvdata(wdog, wdev);
272 watchdog_set_nowayout(wdog, nowayout);
273 watchdog_init_timeout(wdog, timeout, &pdev->dev);
274
275 setup_timer(&wdev->timer, imx2_wdt_timer_ping, (unsigned long)wdog);
276
277 imx2_wdt_ping_if_active(wdog);
278
Markus Pargmann5fe65ce2014-09-08 09:14:07 +0200279 /*
280 * Disable the watchdog power down counter at boot. Otherwise the power
281 * down counter will pull down the #WDOG interrupt line for one clock
282 * cycle.
283 */
284 regmap_write(wdev->regmap, IMX2_WDT_WMCR, 0);
285
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200286 ret = watchdog_register_device(wdog);
287 if (ret) {
288 dev_err(&pdev->dev, "cannot register watchdog device\n");
289 return ret;
290 }
291
Jingchang Lu334a9d82014-09-12 15:24:36 +0800292 wdev->restart_handler.notifier_call = imx2_restart_handler;
293 wdev->restart_handler.priority = 128;
294 ret = register_restart_handler(&wdev->restart_handler);
295 if (ret)
296 dev_err(&pdev->dev, "cannot register restart handler\n");
297
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200298 dev_info(&pdev->dev, "timeout %d sec (nowayout=%d)\n",
299 wdog->timeout, nowayout);
300
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200301 return 0;
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200302}
303
304static int __exit imx2_wdt_remove(struct platform_device *pdev)
305{
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200306 struct watchdog_device *wdog = platform_get_drvdata(pdev);
307 struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200308
Jingchang Lu334a9d82014-09-12 15:24:36 +0800309 unregister_restart_handler(&wdev->restart_handler);
310
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200311 watchdog_unregister_device(wdog);
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200312
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200313 if (imx2_wdt_is_running(wdev)) {
314 del_timer_sync(&wdev->timer);
315 imx2_wdt_ping(wdog);
316 dev_crit(&pdev->dev, "Device removed: Expect reboot!\n");
Jingoo Hanbdf49572013-04-29 18:15:53 +0900317 }
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200318 return 0;
319}
320
321static void imx2_wdt_shutdown(struct platform_device *pdev)
322{
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200323 struct watchdog_device *wdog = platform_get_drvdata(pdev);
324 struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200325
Anatolij Gustschinfaad5de2014-04-11 08:57:14 +0200326 if (imx2_wdt_is_running(wdev)) {
327 /*
328 * We are running, we need to delete the timer but will
329 * give max timeout before reboot will take place
330 */
331 del_timer_sync(&wdev->timer);
332 imx2_wdt_set_timeout(wdog, IMX2_WDT_MAX_TIME);
333 imx2_wdt_ping(wdog);
334 dev_crit(&pdev->dev, "Device shutdown: Expect reboot!\n");
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200335 }
336}
337
Xiubo Liaefbaf32014-09-22 18:00:52 +0800338#ifdef CONFIG_PM_SLEEP
Xiubo Libbd59002014-10-16 11:44:15 +0800339/* Disable watchdog if it is active or non-active but still running */
Xiubo Liaefbaf32014-09-22 18:00:52 +0800340static int imx2_wdt_suspend(struct device *dev)
341{
342 struct watchdog_device *wdog = dev_get_drvdata(dev);
343 struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
344
Xiubo Libbd59002014-10-16 11:44:15 +0800345 /* The watchdog IP block is running */
346 if (imx2_wdt_is_running(wdev)) {
347 imx2_wdt_set_timeout(wdog, IMX2_WDT_MAX_TIME);
348 imx2_wdt_ping(wdog);
Xiubo Liaefbaf32014-09-22 18:00:52 +0800349
Xiubo Libbd59002014-10-16 11:44:15 +0800350 /* The watchdog is not active */
351 if (!watchdog_active(wdog))
352 del_timer_sync(&wdev->timer);
353 }
Xiubo Liaefbaf32014-09-22 18:00:52 +0800354
355 clk_disable_unprepare(wdev->clk);
356
357 return 0;
358}
359
360/* Enable watchdog and configure it if necessary */
361static int imx2_wdt_resume(struct device *dev)
362{
363 struct watchdog_device *wdog = dev_get_drvdata(dev);
364 struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
365
366 clk_prepare_enable(wdev->clk);
367
368 if (watchdog_active(wdog) && !imx2_wdt_is_running(wdev)) {
Xiubo Libbd59002014-10-16 11:44:15 +0800369 /*
370 * If the watchdog is still active and resumes
371 * from deep sleep state, need to restart the
372 * watchdog again.
Xiubo Liaefbaf32014-09-22 18:00:52 +0800373 */
374 imx2_wdt_setup(wdog);
375 imx2_wdt_set_timeout(wdog, wdog->timeout);
376 imx2_wdt_ping(wdog);
377 } else if (imx2_wdt_is_running(wdev)) {
Xiubo Libbd59002014-10-16 11:44:15 +0800378 /* Resuming from non-deep sleep state. */
379 imx2_wdt_set_timeout(wdog, wdog->timeout);
Xiubo Liaefbaf32014-09-22 18:00:52 +0800380 imx2_wdt_ping(wdog);
Xiubo Libbd59002014-10-16 11:44:15 +0800381 /*
382 * But the watchdog is not active, then start
383 * the timer again.
384 */
385 if (!watchdog_active(wdog))
386 mod_timer(&wdev->timer,
387 jiffies + wdog->timeout * HZ / 2);
Xiubo Liaefbaf32014-09-22 18:00:52 +0800388 }
389
390 return 0;
391}
392#endif
393
394static SIMPLE_DEV_PM_OPS(imx2_wdt_pm_ops, imx2_wdt_suspend,
395 imx2_wdt_resume);
396
Shawn Guof5a427e2011-07-18 11:15:21 +0800397static const struct of_device_id imx2_wdt_dt_ids[] = {
398 { .compatible = "fsl,imx21-wdt", },
399 { /* sentinel */ }
400};
Niels de Vos813296a2013-07-29 09:38:18 +0200401MODULE_DEVICE_TABLE(of, imx2_wdt_dt_ids);
Shawn Guof5a427e2011-07-18 11:15:21 +0800402
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200403static struct platform_driver imx2_wdt_driver = {
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200404 .remove = __exit_p(imx2_wdt_remove),
405 .shutdown = imx2_wdt_shutdown,
406 .driver = {
407 .name = DRIVER_NAME,
Xiubo Liaefbaf32014-09-22 18:00:52 +0800408 .pm = &imx2_wdt_pm_ops,
Shawn Guof5a427e2011-07-18 11:15:21 +0800409 .of_match_table = imx2_wdt_dt_ids,
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200410 },
411};
412
Fabio Porcedda1cb92042013-01-09 12:15:27 +0100413module_platform_driver_probe(imx2_wdt_driver, imx2_wdt_probe);
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200414
415MODULE_AUTHOR("Wolfram Sang");
416MODULE_DESCRIPTION("Watchdog driver for IMX2 and later");
417MODULE_LICENSE("GPL v2");
Wolfram Sangbb2fd8a2010-04-29 10:03:17 +0200418MODULE_ALIAS("platform:" DRIVER_NAME);