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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                                unsigned long action, void *data)
 92 {
 93         struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
 94 
 95         wdt->timer_set(wdt, 1);
 96 
 97         return 0;
 98 }
 99 
100 static struct watchdog_ops bcm47xx_wdt_hard_ops = {
101         .owner          = THIS_MODULE,
102         .start          = bcm47xx_wdt_hard_start,
103         .stop           = bcm47xx_wdt_hard_stop,
104         .ping           = bcm47xx_wdt_hard_keepalive,
105         .set_timeout    = bcm47xx_wdt_hard_set_timeout,
106         .restart        = bcm47xx_wdt_restart,
107 };
108 
109 static void bcm47xx_wdt_soft_timer_tick(unsigned long data)
110 {
111         struct bcm47xx_wdt *wdt = (struct bcm47xx_wdt *)data;
112         u32 next_tick = min(wdt->wdd.timeout * 1000, wdt->max_timer_ms);
113 
114         if (!atomic_dec_and_test(&wdt->soft_ticks)) {
115                 wdt->timer_set_ms(wdt, next_tick);
116                 mod_timer(&wdt->soft_timer, jiffies + HZ);
117         } else {
118                 pr_crit("Watchdog will fire soon!!!\n");
119         }
120 }
121 
122 static int bcm47xx_wdt_soft_keepalive(struct watchdog_device *wdd)
123 {
124         struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
125 
126         atomic_set(&wdt->soft_ticks, wdd->timeout);
127 
128         return 0;
129 }
130 
131 static int bcm47xx_wdt_soft_start(struct watchdog_device *wdd)
132 {
133         struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
134 
135         bcm47xx_wdt_soft_keepalive(wdd);
136         bcm47xx_wdt_soft_timer_tick((unsigned long)wdt);
137 
138         return 0;
139 }
140 
141 static int bcm47xx_wdt_soft_stop(struct watchdog_device *wdd)
142 {
143         struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
144 
145         del_timer_sync(&wdt->soft_timer);
146         wdt->timer_set(wdt, 0);
147 
148         return 0;
149 }
150 
151 static int bcm47xx_wdt_soft_set_timeout(struct watchdog_device *wdd,
152                                         unsigned int new_time)
153 {
154         if (new_time < 1 || new_time > WDT_SOFTTIMER_MAX) {
155                 pr_warn("timeout value must be 1<=x<=%d, using %d\n",
156                         WDT_SOFTTIMER_MAX, new_time);
157                 return -EINVAL;
158         }
159 
160         wdd->timeout = new_time;
161         return 0;
162 }
163 
164 static const struct watchdog_info bcm47xx_wdt_info = {
165         .identity       = DRV_NAME,
166         .options        = WDIOF_SETTIMEOUT |
167                                 WDIOF_KEEPALIVEPING |
168                                 WDIOF_MAGICCLOSE,
169 };
170 
171 static struct watchdog_ops bcm47xx_wdt_soft_ops = {
172         .owner          = THIS_MODULE,
173         .start          = bcm47xx_wdt_soft_start,
174         .stop           = bcm47xx_wdt_soft_stop,
175         .ping           = bcm47xx_wdt_soft_keepalive,
176         .set_timeout    = bcm47xx_wdt_soft_set_timeout,
177         .restart        = bcm47xx_wdt_restart,
178 };
179 
180 static int bcm47xx_wdt_probe(struct platform_device *pdev)
181 {
182         int ret;
183         bool soft;
184         struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev);
185 
186         if (!wdt)
187                 return -ENXIO;
188 
189         soft = wdt->max_timer_ms < WDT_SOFTTIMER_THRESHOLD * 1000;
190 
191         if (soft) {
192                 wdt->wdd.ops = &bcm47xx_wdt_soft_ops;
193                 setup_timer(&wdt->soft_timer, bcm47xx_wdt_soft_timer_tick,
194                             (long unsigned int)wdt);
195         } else {
196                 wdt->wdd.ops = &bcm47xx_wdt_hard_ops;
197         }
198 
199         wdt->wdd.info = &bcm47xx_wdt_info;
200         wdt->wdd.timeout = WDT_DEFAULT_TIME;
201         wdt->wdd.parent = &pdev->dev;
202         ret = wdt->wdd.ops->set_timeout(&wdt->wdd, timeout);
203         if (ret)
204                 goto err_timer;
205         watchdog_set_nowayout(&wdt->wdd, nowayout);
206         watchdog_set_restart_priority(&wdt->wdd, 64);
207         watchdog_stop_on_reboot(&wdt->wdd);
208 
209         ret = watchdog_register_device(&wdt->wdd);
210         if (ret)
211                 goto err_timer;
212 
213         dev_info(&pdev->dev, "BCM47xx Watchdog Timer enabled (%d seconds%s%s)\n",
214                 timeout, nowayout ? ", nowayout" : "",
215                 soft ? ", Software Timer" : "");
216         return 0;
217 
218 err_timer:
219         if (soft)
220                 del_timer_sync(&wdt->soft_timer);
221 
222         return ret;
223 }
224 
225 static int bcm47xx_wdt_remove(struct platform_device *pdev)
226 {
227         struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev);
228 
229         if (!wdt)
230                 return -ENXIO;
231 
232         watchdog_unregister_device(&wdt->wdd);
233 
234         return 0;
235 }
236 
237 static struct platform_driver bcm47xx_wdt_driver = {
238         .driver         = {
239                 .name   = "bcm47xx-wdt",
240         },
241         .probe          = bcm47xx_wdt_probe,
242         .remove         = bcm47xx_wdt_remove,
243 };
244 
245 module_platform_driver(bcm47xx_wdt_driver);
246 
247 MODULE_AUTHOR("Aleksandar Radovanovic");
248 MODULE_AUTHOR("Hauke Mehrtens <hauke@hauke-m.de>");
249 MODULE_DESCRIPTION("Watchdog driver for Broadcom BCM47xx");
250 MODULE_LICENSE("GPL");
251 

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