Commit | Line | Data |
---|---|---|
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 */ | |
33 | #define WDT_MAX_TIME 255 /* seconds */ | |
34 | ||
35 | static int wdt_time = WDT_DEFAULT_TIME; | |
86a1e189 | 36 | static bool nowayout = WATCHDOG_NOWAYOUT; |
90074dce | 37 | |
38 | module_param(wdt_time, int, 0); | |
39 | MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default=" | |
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 | ||
f82dedf8 | 52 | static void bcm47xx_timer_tick(unsigned long data) |
90074dce | 53 | { |
f82dedf8 HM |
54 | struct bcm47xx_wdt *wdt = (struct bcm47xx_wdt *)data; |
55 | u32 next_tick = min(wdt->wdd.timeout * 1000, wdt->max_timer_ms); | |
90074dce | 56 | |
f82dedf8 HM |
57 | if (!atomic_dec_and_test(&wdt->soft_ticks)) { |
58 | wdt->timer_set_ms(wdt, next_tick); | |
59 | mod_timer(&wdt->soft_timer, jiffies + HZ); | |
90074dce | 60 | } else { |
27c766aa | 61 | pr_crit("Watchdog will fire soon!!!\n"); |
90074dce | 62 | } |
63 | } | |
64 | ||
5434a04d | 65 | static int bcm47xx_wdt_keepalive(struct watchdog_device *wdd) |
90074dce | 66 | { |
f82dedf8 HM |
67 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); |
68 | ||
69 | atomic_set(&wdt->soft_ticks, wdd->timeout); | |
5434a04d HM |
70 | |
71 | return 0; | |
90074dce | 72 | } |
73 | ||
5434a04d | 74 | static int bcm47xx_wdt_start(struct watchdog_device *wdd) |
90074dce | 75 | { |
f82dedf8 HM |
76 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); |
77 | ||
78 | bcm47xx_wdt_keepalive(wdd); | |
79 | bcm47xx_timer_tick((unsigned long)wdt); | |
5434a04d HM |
80 | |
81 | return 0; | |
90074dce | 82 | } |
83 | ||
5434a04d | 84 | static int bcm47xx_wdt_stop(struct watchdog_device *wdd) |
90074dce | 85 | { |
f82dedf8 HM |
86 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); |
87 | ||
88 | del_timer_sync(&wdt->soft_timer); | |
89 | wdt->timer_set(wdt, 0); | |
90074dce | 90 | |
5434a04d | 91 | return 0; |
90074dce | 92 | } |
93 | ||
5434a04d HM |
94 | static int bcm47xx_wdt_set_timeout(struct watchdog_device *wdd, |
95 | unsigned int new_time) | |
90074dce | 96 | { |
f82dedf8 HM |
97 | if (new_time < 1 || new_time > WDT_MAX_TIME) { |
98 | pr_warn("timeout value must be 1<=x<=%d, using %d\n", | |
99 | WDT_MAX_TIME, new_time); | |
90074dce | 100 | return -EINVAL; |
f82dedf8 | 101 | } |
90074dce | 102 | |
f82dedf8 | 103 | wdd->timeout = new_time; |
90074dce | 104 | return 0; |
105 | } | |
106 | ||
42747d71 | 107 | static const struct watchdog_info bcm47xx_wdt_info = { |
5f3b2756 WVS |
108 | .identity = DRV_NAME, |
109 | .options = WDIOF_SETTIMEOUT | | |
90074dce | 110 | WDIOF_KEEPALIVEPING | |
111 | WDIOF_MAGICCLOSE, | |
112 | }; | |
113 | ||
90074dce | 114 | static int bcm47xx_wdt_notify_sys(struct notifier_block *this, |
5434a04d | 115 | unsigned long code, void *unused) |
90074dce | 116 | { |
f82dedf8 HM |
117 | struct bcm47xx_wdt *wdt; |
118 | ||
119 | wdt = container_of(this, struct bcm47xx_wdt, notifier); | |
90074dce | 120 | if (code == SYS_DOWN || code == SYS_HALT) |
f82dedf8 | 121 | wdt->wdd.ops->stop(&wdt->wdd); |
90074dce | 122 | return NOTIFY_DONE; |
123 | } | |
124 | ||
5434a04d | 125 | static struct watchdog_ops bcm47xx_wdt_ops = { |
90074dce | 126 | .owner = THIS_MODULE, |
5434a04d HM |
127 | .start = bcm47xx_wdt_start, |
128 | .stop = bcm47xx_wdt_stop, | |
129 | .ping = bcm47xx_wdt_keepalive, | |
130 | .set_timeout = bcm47xx_wdt_set_timeout, | |
90074dce | 131 | }; |
132 | ||
f82dedf8 | 133 | static int bcm47xx_wdt_probe(struct platform_device *pdev) |
90074dce | 134 | { |
135 | int ret; | |
f82dedf8 | 136 | struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev); |
90074dce | 137 | |
f82dedf8 HM |
138 | if (!wdt) |
139 | return -ENXIO; | |
90074dce | 140 | |
f82dedf8 HM |
141 | setup_timer(&wdt->soft_timer, bcm47xx_timer_tick, |
142 | (long unsigned int)wdt); | |
90074dce | 143 | |
f82dedf8 HM |
144 | wdt->wdd.ops = &bcm47xx_wdt_ops; |
145 | wdt->wdd.info = &bcm47xx_wdt_info; | |
146 | wdt->wdd.timeout = WDT_DEFAULT_TIME; | |
147 | ret = wdt->wdd.ops->set_timeout(&wdt->wdd, timeout); | |
148 | if (ret) | |
149 | goto err_timer; | |
150 | watchdog_set_nowayout(&wdt->wdd, nowayout); | |
151 | ||
152 | wdt->notifier.notifier_call = &bcm47xx_wdt_notify_sys; | |
90074dce | 153 | |
f82dedf8 | 154 | ret = register_reboot_notifier(&wdt->notifier); |
90074dce | 155 | if (ret) |
f82dedf8 | 156 | goto err_timer; |
90074dce | 157 | |
f82dedf8 HM |
158 | ret = watchdog_register_device(&wdt->wdd); |
159 | if (ret) | |
160 | goto err_notifier; | |
90074dce | 161 | |
27c766aa JP |
162 | pr_info("BCM47xx Watchdog Timer enabled (%d seconds%s)\n", |
163 | wdt_time, nowayout ? ", nowayout" : ""); | |
90074dce | 164 | return 0; |
f82dedf8 HM |
165 | |
166 | err_notifier: | |
167 | unregister_reboot_notifier(&wdt->notifier); | |
168 | err_timer: | |
169 | del_timer_sync(&wdt->soft_timer); | |
170 | ||
171 | return ret; | |
90074dce | 172 | } |
173 | ||
f82dedf8 | 174 | static int bcm47xx_wdt_remove(struct platform_device *pdev) |
90074dce | 175 | { |
f82dedf8 HM |
176 | struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev); |
177 | ||
178 | if (!wdt) | |
179 | return -ENXIO; | |
180 | ||
181 | watchdog_unregister_device(&wdt->wdd); | |
182 | unregister_reboot_notifier(&wdt->notifier); | |
90074dce | 183 | |
f82dedf8 | 184 | return 0; |
90074dce | 185 | } |
186 | ||
f82dedf8 HM |
187 | static struct platform_driver bcm47xx_wdt_driver = { |
188 | .driver = { | |
189 | .owner = THIS_MODULE, | |
190 | .name = "bcm47xx-wdt", | |
191 | }, | |
192 | .probe = bcm47xx_wdt_probe, | |
193 | .remove = bcm47xx_wdt_remove, | |
194 | }; | |
195 | ||
196 | module_platform_driver(bcm47xx_wdt_driver); | |
90074dce | 197 | |
198 | MODULE_AUTHOR("Aleksandar Radovanovic"); | |
f82dedf8 | 199 | MODULE_AUTHOR("Hauke Mehrtens <hauke@hauke-m.de>"); |
90074dce | 200 | MODULE_DESCRIPTION("Watchdog driver for Broadcom BCM47xx"); |
201 | MODULE_LICENSE("GPL"); |