2 * Watchdog driver for Broadcom BCM47XX
4 * Copyright (C) 2008 Aleksandar Radovanovic <biblbroks@sezampro.rs>
5 * Copyright (C) 2009 Matthieu CASTET <castet.matthieu@free.fr>
6 * Copyright (C) 2012-2013 Hauke Mehrtens <hauke@hauke-m.de>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16 #include <linux/bcm47xx_wdt.h>
17 #include <linux/bitops.h>
18 #include <linux/errno.h>
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/moduleparam.h>
22 #include <linux/platform_device.h>
23 #include <linux/types.h>
24 #include <linux/watchdog.h>
25 #include <linux/timer.h>
26 #include <linux/jiffies.h>
28 #define DRV_NAME "bcm47xx_wdt"
30 #define WDT_DEFAULT_TIME 30 /* seconds */
31 #define WDT_SOFTTIMER_MAX 255 /* seconds */
32 #define WDT_SOFTTIMER_THRESHOLD 60 /* seconds */
34 static int timeout = WDT_DEFAULT_TIME;
35 static bool nowayout = WATCHDOG_NOWAYOUT;
37 module_param(timeout, int, 0);
38 MODULE_PARM_DESC(timeout, "Watchdog time in seconds. (default="
39 __MODULE_STRING(WDT_DEFAULT_TIME) ")");
41 module_param(nowayout, bool, 0);
42 MODULE_PARM_DESC(nowayout,
43 "Watchdog cannot be stopped once started (default="
44 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
46 static inline struct bcm47xx_wdt *bcm47xx_wdt_get(struct watchdog_device *wdd)
48 return container_of(wdd, struct bcm47xx_wdt, wdd);
51 static int bcm47xx_wdt_hard_keepalive(struct watchdog_device *wdd)
53 struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
55 wdt->timer_set_ms(wdt, wdd->timeout * 1000);
60 static int bcm47xx_wdt_hard_start(struct watchdog_device *wdd)
65 static int bcm47xx_wdt_hard_stop(struct watchdog_device *wdd)
67 struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
69 wdt->timer_set(wdt, 0);
74 static int bcm47xx_wdt_hard_set_timeout(struct watchdog_device *wdd,
75 unsigned int new_time)
77 struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
78 u32 max_timer = wdt->max_timer_ms;
80 if (new_time < 1 || new_time > max_timer / 1000) {
81 pr_warn("timeout value must be 1<=x<=%d, using %d\n",
82 max_timer / 1000, new_time);
86 wdd->timeout = new_time;
90 static int bcm47xx_wdt_restart(struct watchdog_device *wdd)
92 struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
94 wdt->timer_set(wdt, 1);
99 static struct watchdog_ops bcm47xx_wdt_hard_ops = {
100 .owner = THIS_MODULE,
101 .start = bcm47xx_wdt_hard_start,
102 .stop = bcm47xx_wdt_hard_stop,
103 .ping = bcm47xx_wdt_hard_keepalive,
104 .set_timeout = bcm47xx_wdt_hard_set_timeout,
105 .restart = bcm47xx_wdt_restart,
108 static void bcm47xx_wdt_soft_timer_tick(unsigned long data)
110 struct bcm47xx_wdt *wdt = (struct bcm47xx_wdt *)data;
111 u32 next_tick = min(wdt->wdd.timeout * 1000, wdt->max_timer_ms);
113 if (!atomic_dec_and_test(&wdt->soft_ticks)) {
114 wdt->timer_set_ms(wdt, next_tick);
115 mod_timer(&wdt->soft_timer, jiffies + HZ);
117 pr_crit("Watchdog will fire soon!!!\n");
121 static int bcm47xx_wdt_soft_keepalive(struct watchdog_device *wdd)
123 struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
125 atomic_set(&wdt->soft_ticks, wdd->timeout);
130 static int bcm47xx_wdt_soft_start(struct watchdog_device *wdd)
132 struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
134 bcm47xx_wdt_soft_keepalive(wdd);
135 bcm47xx_wdt_soft_timer_tick((unsigned long)wdt);
140 static int bcm47xx_wdt_soft_stop(struct watchdog_device *wdd)
142 struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
144 del_timer_sync(&wdt->soft_timer);
145 wdt->timer_set(wdt, 0);
150 static int bcm47xx_wdt_soft_set_timeout(struct watchdog_device *wdd,
151 unsigned int new_time)
153 if (new_time < 1 || new_time > WDT_SOFTTIMER_MAX) {
154 pr_warn("timeout value must be 1<=x<=%d, using %d\n",
155 WDT_SOFTTIMER_MAX, new_time);
159 wdd->timeout = new_time;
163 static const struct watchdog_info bcm47xx_wdt_info = {
164 .identity = DRV_NAME,
165 .options = WDIOF_SETTIMEOUT |
166 WDIOF_KEEPALIVEPING |
170 static struct watchdog_ops bcm47xx_wdt_soft_ops = {
171 .owner = THIS_MODULE,
172 .start = bcm47xx_wdt_soft_start,
173 .stop = bcm47xx_wdt_soft_stop,
174 .ping = bcm47xx_wdt_soft_keepalive,
175 .set_timeout = bcm47xx_wdt_soft_set_timeout,
176 .restart = bcm47xx_wdt_restart,
179 static int bcm47xx_wdt_probe(struct platform_device *pdev)
183 struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev);
188 soft = wdt->max_timer_ms < WDT_SOFTTIMER_THRESHOLD * 1000;
191 wdt->wdd.ops = &bcm47xx_wdt_soft_ops;
192 setup_timer(&wdt->soft_timer, bcm47xx_wdt_soft_timer_tick,
193 (long unsigned int)wdt);
195 wdt->wdd.ops = &bcm47xx_wdt_hard_ops;
198 wdt->wdd.info = &bcm47xx_wdt_info;
199 wdt->wdd.timeout = WDT_DEFAULT_TIME;
200 wdt->wdd.parent = &pdev->dev;
201 ret = wdt->wdd.ops->set_timeout(&wdt->wdd, timeout);
204 watchdog_set_nowayout(&wdt->wdd, nowayout);
205 watchdog_set_restart_priority(&wdt->wdd, 64);
206 watchdog_stop_on_reboot(&wdt->wdd);
208 ret = watchdog_register_device(&wdt->wdd);
212 dev_info(&pdev->dev, "BCM47xx Watchdog Timer enabled (%d seconds%s%s)\n",
213 timeout, nowayout ? ", nowayout" : "",
214 soft ? ", Software Timer" : "");
219 del_timer_sync(&wdt->soft_timer);
224 static int bcm47xx_wdt_remove(struct platform_device *pdev)
226 struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev);
231 watchdog_unregister_device(&wdt->wdd);
236 static struct platform_driver bcm47xx_wdt_driver = {
238 .name = "bcm47xx-wdt",
240 .probe = bcm47xx_wdt_probe,
241 .remove = bcm47xx_wdt_remove,
244 module_platform_driver(bcm47xx_wdt_driver);
246 MODULE_AUTHOR("Aleksandar Radovanovic");
247 MODULE_AUTHOR("Hauke Mehrtens <hauke@hauke-m.de>");
248 MODULE_DESCRIPTION("Watchdog driver for Broadcom BCM47xx");
249 MODULE_LICENSE("GPL");