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