Commit | Line | Data |
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90074dce | 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> | |
f82dedf8 | 6 | * Copyright (C) 2012-2013 Hauke Mehrtens <hauke@hauke-m.de> |
90074dce | 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 | ||
27c766aa JP |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
15 | ||
f82dedf8 | 16 | #include <linux/bcm47xx_wdt.h> |
90074dce | 17 | #include <linux/bitops.h> |
18 | #include <linux/errno.h> | |
90074dce | 19 | #include <linux/kernel.h> |
90074dce | 20 | #include <linux/module.h> |
21 | #include <linux/moduleparam.h> | |
f82dedf8 | 22 | #include <linux/platform_device.h> |
90074dce | 23 | #include <linux/reboot.h> |
24 | #include <linux/types.h> | |
90074dce | 25 | #include <linux/watchdog.h> |
26 | #include <linux/timer.h> | |
27 | #include <linux/jiffies.h> | |
90074dce | 28 | |
29 | #define DRV_NAME "bcm47xx_wdt" | |
30 | ||
31 | #define WDT_DEFAULT_TIME 30 /* seconds */ | |
a3906892 | 32 | #define WDT_SOFTTIMER_MAX 255 /* seconds */ |
e3e83d00 | 33 | #define WDT_SOFTTIMER_THRESHOLD 60 /* seconds */ |
90074dce | 34 | |
93aed1f0 | 35 | static int timeout = WDT_DEFAULT_TIME; |
86a1e189 | 36 | static bool nowayout = WATCHDOG_NOWAYOUT; |
90074dce | 37 | |
93aed1f0 HM |
38 | module_param(timeout, int, 0); |
39 | MODULE_PARM_DESC(timeout, "Watchdog time in seconds. (default=" | |
90074dce | 40 | __MODULE_STRING(WDT_DEFAULT_TIME) ")"); |
41 | ||
86a1e189 | 42 | module_param(nowayout, bool, 0); |
90074dce | 43 | MODULE_PARM_DESC(nowayout, |
44 | "Watchdog cannot be stopped once started (default=" | |
45 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
90074dce | 46 | |
f82dedf8 | 47 | static inline struct bcm47xx_wdt *bcm47xx_wdt_get(struct watchdog_device *wdd) |
90074dce | 48 | { |
f82dedf8 | 49 | return container_of(wdd, struct bcm47xx_wdt, wdd); |
90074dce | 50 | } |
51 | ||
e3e83d00 HM |
52 | static int bcm47xx_wdt_hard_keepalive(struct watchdog_device *wdd) |
53 | { | |
54 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); | |
55 | ||
56 | wdt->timer_set_ms(wdt, wdd->timeout * 1000); | |
57 | ||
58 | return 0; | |
59 | } | |
60 | ||
61 | static int bcm47xx_wdt_hard_start(struct watchdog_device *wdd) | |
62 | { | |
63 | return 0; | |
64 | } | |
65 | ||
66 | static int bcm47xx_wdt_hard_stop(struct watchdog_device *wdd) | |
67 | { | |
68 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); | |
69 | ||
70 | wdt->timer_set(wdt, 0); | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
75 | static int bcm47xx_wdt_hard_set_timeout(struct watchdog_device *wdd, | |
76 | unsigned int new_time) | |
77 | { | |
78 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); | |
79 | u32 max_timer = wdt->max_timer_ms; | |
80 | ||
81 | if (new_time < 1 || new_time > max_timer / 1000) { | |
82 | pr_warn("timeout value must be 1<=x<=%d, using %d\n", | |
83 | max_timer / 1000, new_time); | |
84 | return -EINVAL; | |
85 | } | |
86 | ||
87 | wdd->timeout = new_time; | |
88 | return 0; | |
89 | } | |
90 | ||
91 | static struct watchdog_ops bcm47xx_wdt_hard_ops = { | |
92 | .owner = THIS_MODULE, | |
93 | .start = bcm47xx_wdt_hard_start, | |
94 | .stop = bcm47xx_wdt_hard_stop, | |
95 | .ping = bcm47xx_wdt_hard_keepalive, | |
96 | .set_timeout = bcm47xx_wdt_hard_set_timeout, | |
97 | }; | |
98 | ||
a3906892 | 99 | static void bcm47xx_wdt_soft_timer_tick(unsigned long data) |
90074dce | 100 | { |
f82dedf8 HM |
101 | struct bcm47xx_wdt *wdt = (struct bcm47xx_wdt *)data; |
102 | u32 next_tick = min(wdt->wdd.timeout * 1000, wdt->max_timer_ms); | |
90074dce | 103 | |
f82dedf8 HM |
104 | if (!atomic_dec_and_test(&wdt->soft_ticks)) { |
105 | wdt->timer_set_ms(wdt, next_tick); | |
106 | mod_timer(&wdt->soft_timer, jiffies + HZ); | |
90074dce | 107 | } else { |
27c766aa | 108 | pr_crit("Watchdog will fire soon!!!\n"); |
90074dce | 109 | } |
110 | } | |
111 | ||
a3906892 | 112 | static int bcm47xx_wdt_soft_keepalive(struct watchdog_device *wdd) |
90074dce | 113 | { |
f82dedf8 HM |
114 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); |
115 | ||
116 | atomic_set(&wdt->soft_ticks, wdd->timeout); | |
5434a04d HM |
117 | |
118 | return 0; | |
90074dce | 119 | } |
120 | ||
a3906892 | 121 | static int bcm47xx_wdt_soft_start(struct watchdog_device *wdd) |
90074dce | 122 | { |
f82dedf8 HM |
123 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); |
124 | ||
a3906892 HM |
125 | bcm47xx_wdt_soft_keepalive(wdd); |
126 | bcm47xx_wdt_soft_timer_tick((unsigned long)wdt); | |
5434a04d HM |
127 | |
128 | return 0; | |
90074dce | 129 | } |
130 | ||
a3906892 | 131 | static int bcm47xx_wdt_soft_stop(struct watchdog_device *wdd) |
90074dce | 132 | { |
f82dedf8 HM |
133 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); |
134 | ||
135 | del_timer_sync(&wdt->soft_timer); | |
136 | wdt->timer_set(wdt, 0); | |
90074dce | 137 | |
5434a04d | 138 | return 0; |
90074dce | 139 | } |
140 | ||
a3906892 HM |
141 | static int bcm47xx_wdt_soft_set_timeout(struct watchdog_device *wdd, |
142 | unsigned int new_time) | |
90074dce | 143 | { |
a3906892 | 144 | if (new_time < 1 || new_time > WDT_SOFTTIMER_MAX) { |
f82dedf8 | 145 | pr_warn("timeout value must be 1<=x<=%d, using %d\n", |
a3906892 | 146 | WDT_SOFTTIMER_MAX, new_time); |
90074dce | 147 | return -EINVAL; |
f82dedf8 | 148 | } |
90074dce | 149 | |
f82dedf8 | 150 | wdd->timeout = new_time; |
90074dce | 151 | return 0; |
152 | } | |
153 | ||
42747d71 | 154 | static const struct watchdog_info bcm47xx_wdt_info = { |
5f3b2756 WVS |
155 | .identity = DRV_NAME, |
156 | .options = WDIOF_SETTIMEOUT | | |
90074dce | 157 | WDIOF_KEEPALIVEPING | |
158 | WDIOF_MAGICCLOSE, | |
159 | }; | |
160 | ||
90074dce | 161 | static int bcm47xx_wdt_notify_sys(struct notifier_block *this, |
5434a04d | 162 | unsigned long code, void *unused) |
90074dce | 163 | { |
f82dedf8 HM |
164 | struct bcm47xx_wdt *wdt; |
165 | ||
166 | wdt = container_of(this, struct bcm47xx_wdt, notifier); | |
90074dce | 167 | if (code == SYS_DOWN || code == SYS_HALT) |
f82dedf8 | 168 | wdt->wdd.ops->stop(&wdt->wdd); |
90074dce | 169 | return NOTIFY_DONE; |
170 | } | |
171 | ||
1cc7495c RM |
172 | static int bcm47xx_wdt_restart(struct notifier_block *this, unsigned long mode, |
173 | void *cmd) | |
174 | { | |
175 | struct bcm47xx_wdt *wdt; | |
176 | ||
177 | wdt = container_of(this, struct bcm47xx_wdt, restart_handler); | |
178 | wdt->timer_set(wdt, 1); | |
179 | ||
180 | return NOTIFY_DONE; | |
181 | } | |
182 | ||
a3906892 | 183 | static struct watchdog_ops bcm47xx_wdt_soft_ops = { |
90074dce | 184 | .owner = THIS_MODULE, |
a3906892 HM |
185 | .start = bcm47xx_wdt_soft_start, |
186 | .stop = bcm47xx_wdt_soft_stop, | |
187 | .ping = bcm47xx_wdt_soft_keepalive, | |
188 | .set_timeout = bcm47xx_wdt_soft_set_timeout, | |
90074dce | 189 | }; |
190 | ||
f82dedf8 | 191 | static int bcm47xx_wdt_probe(struct platform_device *pdev) |
90074dce | 192 | { |
193 | int ret; | |
e3e83d00 | 194 | bool soft; |
f82dedf8 | 195 | struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev); |
90074dce | 196 | |
f82dedf8 HM |
197 | if (!wdt) |
198 | return -ENXIO; | |
90074dce | 199 | |
e3e83d00 HM |
200 | soft = wdt->max_timer_ms < WDT_SOFTTIMER_THRESHOLD * 1000; |
201 | ||
202 | if (soft) { | |
203 | wdt->wdd.ops = &bcm47xx_wdt_soft_ops; | |
204 | setup_timer(&wdt->soft_timer, bcm47xx_wdt_soft_timer_tick, | |
205 | (long unsigned int)wdt); | |
206 | } else { | |
207 | wdt->wdd.ops = &bcm47xx_wdt_hard_ops; | |
208 | } | |
90074dce | 209 | |
f82dedf8 HM |
210 | wdt->wdd.info = &bcm47xx_wdt_info; |
211 | wdt->wdd.timeout = WDT_DEFAULT_TIME; | |
212 | ret = wdt->wdd.ops->set_timeout(&wdt->wdd, timeout); | |
213 | if (ret) | |
214 | goto err_timer; | |
215 | watchdog_set_nowayout(&wdt->wdd, nowayout); | |
216 | ||
217 | wdt->notifier.notifier_call = &bcm47xx_wdt_notify_sys; | |
90074dce | 218 | |
f82dedf8 | 219 | ret = register_reboot_notifier(&wdt->notifier); |
90074dce | 220 | if (ret) |
f82dedf8 | 221 | goto err_timer; |
90074dce | 222 | |
1cc7495c RM |
223 | wdt->restart_handler.notifier_call = &bcm47xx_wdt_restart; |
224 | wdt->restart_handler.priority = 64; | |
225 | ret = register_restart_handler(&wdt->restart_handler); | |
f82dedf8 HM |
226 | if (ret) |
227 | goto err_notifier; | |
90074dce | 228 | |
1cc7495c RM |
229 | ret = watchdog_register_device(&wdt->wdd); |
230 | if (ret) | |
231 | goto err_handler; | |
232 | ||
e3e83d00 HM |
233 | dev_info(&pdev->dev, "BCM47xx Watchdog Timer enabled (%d seconds%s%s)\n", |
234 | timeout, nowayout ? ", nowayout" : "", | |
235 | soft ? ", Software Timer" : ""); | |
90074dce | 236 | return 0; |
f82dedf8 | 237 | |
1cc7495c RM |
238 | err_handler: |
239 | unregister_restart_handler(&wdt->restart_handler); | |
f82dedf8 HM |
240 | err_notifier: |
241 | unregister_reboot_notifier(&wdt->notifier); | |
242 | err_timer: | |
e3e83d00 HM |
243 | if (soft) |
244 | del_timer_sync(&wdt->soft_timer); | |
f82dedf8 HM |
245 | |
246 | return ret; | |
90074dce | 247 | } |
248 | ||
f82dedf8 | 249 | static int bcm47xx_wdt_remove(struct platform_device *pdev) |
90074dce | 250 | { |
f82dedf8 HM |
251 | struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev); |
252 | ||
253 | if (!wdt) | |
254 | return -ENXIO; | |
255 | ||
256 | watchdog_unregister_device(&wdt->wdd); | |
257 | unregister_reboot_notifier(&wdt->notifier); | |
90074dce | 258 | |
f82dedf8 | 259 | return 0; |
90074dce | 260 | } |
261 | ||
f82dedf8 HM |
262 | static struct platform_driver bcm47xx_wdt_driver = { |
263 | .driver = { | |
f82dedf8 HM |
264 | .name = "bcm47xx-wdt", |
265 | }, | |
266 | .probe = bcm47xx_wdt_probe, | |
267 | .remove = bcm47xx_wdt_remove, | |
268 | }; | |
269 | ||
270 | module_platform_driver(bcm47xx_wdt_driver); | |
90074dce | 271 | |
272 | MODULE_AUTHOR("Aleksandar Radovanovic"); | |
f82dedf8 | 273 | MODULE_AUTHOR("Hauke Mehrtens <hauke@hauke-m.de>"); |
90074dce | 274 | MODULE_DESCRIPTION("Watchdog driver for Broadcom BCM47xx"); |
275 | MODULE_LICENSE("GPL"); |