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Linux/drivers/watchdog/bcm47xx_wdt.c

  1 /*
  2  *  Watchdog driver for Broadcom BCM47XX
  3  *
  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>
  7  *
  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.
 12  */
 13 
 14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 15 
 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>
 27 
 28 #define DRV_NAME                "bcm47xx_wdt"
 29 
 30 #define WDT_DEFAULT_TIME        30      /* seconds */
 31 #define WDT_SOFTTIMER_MAX       255     /* seconds */
 32 #define WDT_SOFTTIMER_THRESHOLD 60      /* seconds */
 33 
 34 static int timeout = WDT_DEFAULT_TIME;
 35 static bool nowayout = WATCHDOG_NOWAYOUT;
 36 
 37 module_param(timeout, int, 0);
 38 MODULE_PARM_DESC(timeout, "Watchdog time in seconds. (default="
 39                                 __MODULE_STRING(WDT_DEFAULT_TIME) ")");
 40 
 41 module_param(nowayout, bool, 0);
 42 MODULE_PARM_DESC(nowayout,
 43                 "Watchdog cannot be stopped once started (default="
 44                                 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 45 
 46 static inline struct bcm47xx_wdt *bcm47xx_wdt_get(struct watchdog_device *wdd)
 47 {
 48         return container_of(wdd, struct bcm47xx_wdt, wdd);
 49 }
 50 
 51 static int bcm47xx_wdt_hard_keepalive(struct watchdog_device *wdd)
 52 {
 53         struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
 54 
 55         wdt->timer_set_ms(wdt, wdd->timeout * 1000);
 56 
 57         return 0;
 58 }
 59 
 60 static int bcm47xx_wdt_hard_start(struct watchdog_device *wdd)
 61 {
 62         return 0;
 63 }
 64 
 65 static int bcm47xx_wdt_hard_stop(struct watchdog_device *wdd)
 66 {
 67         struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
 68 
 69         wdt->timer_set(wdt, 0);
 70 
 71         return 0;
 72 }
 73 
 74 static int bcm47xx_wdt_hard_set_timeout(struct watchdog_device *wdd,
 75                                         unsigned int new_time)
 76 {
 77         struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
 78         u32 max_timer = wdt->max_timer_ms;
 79 
 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);
 83                 return -EINVAL;
 84         }
 85 
 86         wdd->timeout = new_time;
 87         return 0;
 88 }
 89 
 90 static int bcm47xx_wdt_restart(struct watchdog_device *wdd)
 91 {
 92         struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
 93 
 94         wdt->timer_set(wdt, 1);
 95 
 96         return 0;
 97 }
 98 
 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,
106 };
107 
108 static void bcm47xx_wdt_soft_timer_tick(unsigned long data)
109 {
110         struct bcm47xx_wdt *wdt = (struct bcm47xx_wdt *)data;
111         u32 next_tick = min(wdt->wdd.timeout * 1000, wdt->max_timer_ms);
112 
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);
116         } else {
117                 pr_crit("Watchdog will fire soon!!!\n");
118         }
119 }
120 
121 static int bcm47xx_wdt_soft_keepalive(struct watchdog_device *wdd)
122 {
123         struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
124 
125         atomic_set(&wdt->soft_ticks, wdd->timeout);
126 
127         return 0;
128 }
129 
130 static int bcm47xx_wdt_soft_start(struct watchdog_device *wdd)
131 {
132         struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
133 
134         bcm47xx_wdt_soft_keepalive(wdd);
135         bcm47xx_wdt_soft_timer_tick((unsigned long)wdt);
136 
137         return 0;
138 }
139 
140 static int bcm47xx_wdt_soft_stop(struct watchdog_device *wdd)
141 {
142         struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
143 
144         del_timer_sync(&wdt->soft_timer);
145         wdt->timer_set(wdt, 0);
146 
147         return 0;
148 }
149 
150 static int bcm47xx_wdt_soft_set_timeout(struct watchdog_device *wdd,
151                                         unsigned int new_time)
152 {
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);
156                 return -EINVAL;
157         }
158 
159         wdd->timeout = new_time;
160         return 0;
161 }
162 
163 static const struct watchdog_info bcm47xx_wdt_info = {
164         .identity       = DRV_NAME,
165         .options        = WDIOF_SETTIMEOUT |
166                                 WDIOF_KEEPALIVEPING |
167                                 WDIOF_MAGICCLOSE,
168 };
169 
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,
177 };
178 
179 static int bcm47xx_wdt_probe(struct platform_device *pdev)
180 {
181         int ret;
182         bool soft;
183         struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev);
184 
185         if (!wdt)
186                 return -ENXIO;
187 
188         soft = wdt->max_timer_ms < WDT_SOFTTIMER_THRESHOLD * 1000;
189 
190         if (soft) {
191                 wdt->wdd.ops = &bcm47xx_wdt_soft_ops;
192                 setup_timer(&wdt->soft_timer, bcm47xx_wdt_soft_timer_tick,
193                             (long unsigned int)wdt);
194         } else {
195                 wdt->wdd.ops = &bcm47xx_wdt_hard_ops;
196         }
197 
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);
202         if (ret)
203                 goto err_timer;
204         watchdog_set_nowayout(&wdt->wdd, nowayout);
205         watchdog_set_restart_priority(&wdt->wdd, 64);
206         watchdog_stop_on_reboot(&wdt->wdd);
207 
208         ret = watchdog_register_device(&wdt->wdd);
209         if (ret)
210                 goto err_timer;
211 
212         dev_info(&pdev->dev, "BCM47xx Watchdog Timer enabled (%d seconds%s%s)\n",
213                 timeout, nowayout ? ", nowayout" : "",
214                 soft ? ", Software Timer" : "");
215         return 0;
216 
217 err_timer:
218         if (soft)
219                 del_timer_sync(&wdt->soft_timer);
220 
221         return ret;
222 }
223 
224 static int bcm47xx_wdt_remove(struct platform_device *pdev)
225 {
226         struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev);
227 
228         if (!wdt)
229                 return -ENXIO;
230 
231         watchdog_unregister_device(&wdt->wdd);
232 
233         return 0;
234 }
235 
236 static struct platform_driver bcm47xx_wdt_driver = {
237         .driver         = {
238                 .name   = "bcm47xx-wdt",
239         },
240         .probe          = bcm47xx_wdt_probe,
241         .remove         = bcm47xx_wdt_remove,
242 };
243 
244 module_platform_driver(bcm47xx_wdt_driver);
245 
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");
250 

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