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> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
27c766aa JP |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
90074dce | 15 | #include <linux/bitops.h> |
16 | #include <linux/errno.h> | |
90074dce | 17 | #include <linux/init.h> |
18 | #include <linux/kernel.h> | |
90074dce | 19 | #include <linux/module.h> |
20 | #include <linux/moduleparam.h> | |
21 | #include <linux/reboot.h> | |
22 | #include <linux/types.h> | |
90074dce | 23 | #include <linux/watchdog.h> |
24 | #include <linux/timer.h> | |
25 | #include <linux/jiffies.h> | |
26 | #include <linux/ssb/ssb_embedded.h> | |
27 | #include <asm/mach-bcm47xx/bcm47xx.h> | |
28 | ||
29 | #define DRV_NAME "bcm47xx_wdt" | |
30 | ||
31 | #define WDT_DEFAULT_TIME 30 /* seconds */ | |
32 | #define WDT_MAX_TIME 255 /* seconds */ | |
33 | ||
34 | static int wdt_time = WDT_DEFAULT_TIME; | |
86a1e189 | 35 | static bool nowayout = WATCHDOG_NOWAYOUT; |
90074dce | 36 | |
37 | module_param(wdt_time, int, 0); | |
38 | MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default=" | |
39 | __MODULE_STRING(WDT_DEFAULT_TIME) ")"); | |
40 | ||
86a1e189 | 41 | module_param(nowayout, bool, 0); |
90074dce | 42 | MODULE_PARM_DESC(nowayout, |
43 | "Watchdog cannot be stopped once started (default=" | |
44 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
90074dce | 45 | |
90074dce | 46 | static struct timer_list wdt_timer; |
47 | static atomic_t ticks; | |
48 | ||
49 | static inline void bcm47xx_wdt_hw_start(void) | |
50 | { | |
51 | /* this is 2,5s on 100Mhz clock and 2s on 133 Mhz */ | |
08ccf572 | 52 | switch (bcm47xx_bus_type) { |
a656ffcb | 53 | #ifdef CONFIG_BCM47XX_SSB |
08ccf572 HM |
54 | case BCM47XX_BUS_TYPE_SSB: |
55 | ssb_watchdog_timer_set(&bcm47xx_bus.ssb, 0xfffffff); | |
56 | break; | |
c1d1c5d4 HM |
57 | #endif |
58 | #ifdef CONFIG_BCM47XX_BCMA | |
59 | case BCM47XX_BUS_TYPE_BCMA: | |
60 | bcma_chipco_watchdog_timer_set(&bcm47xx_bus.bcma.bus.drv_cc, | |
61 | 0xfffffff); | |
62 | break; | |
a656ffcb | 63 | #endif |
08ccf572 | 64 | } |
90074dce | 65 | } |
66 | ||
67 | static inline int bcm47xx_wdt_hw_stop(void) | |
68 | { | |
08ccf572 | 69 | switch (bcm47xx_bus_type) { |
a656ffcb | 70 | #ifdef CONFIG_BCM47XX_SSB |
08ccf572 HM |
71 | case BCM47XX_BUS_TYPE_SSB: |
72 | return ssb_watchdog_timer_set(&bcm47xx_bus.ssb, 0); | |
c1d1c5d4 HM |
73 | #endif |
74 | #ifdef CONFIG_BCM47XX_BCMA | |
75 | case BCM47XX_BUS_TYPE_BCMA: | |
76 | bcma_chipco_watchdog_timer_set(&bcm47xx_bus.bcma.bus.drv_cc, 0); | |
77 | return 0; | |
a656ffcb | 78 | #endif |
08ccf572 HM |
79 | } |
80 | return -EINVAL; | |
90074dce | 81 | } |
82 | ||
83 | static void bcm47xx_timer_tick(unsigned long unused) | |
84 | { | |
85 | if (!atomic_dec_and_test(&ticks)) { | |
86 | bcm47xx_wdt_hw_start(); | |
87 | mod_timer(&wdt_timer, jiffies + HZ); | |
88 | } else { | |
27c766aa | 89 | pr_crit("Watchdog will fire soon!!!\n"); |
90074dce | 90 | } |
91 | } | |
92 | ||
5434a04d | 93 | static int bcm47xx_wdt_keepalive(struct watchdog_device *wdd) |
90074dce | 94 | { |
95 | atomic_set(&ticks, wdt_time); | |
5434a04d HM |
96 | |
97 | return 0; | |
90074dce | 98 | } |
99 | ||
5434a04d | 100 | static int bcm47xx_wdt_start(struct watchdog_device *wdd) |
90074dce | 101 | { |
102 | bcm47xx_wdt_pet(); | |
103 | bcm47xx_timer_tick(0); | |
5434a04d HM |
104 | |
105 | return 0; | |
90074dce | 106 | } |
107 | ||
5434a04d | 108 | static int bcm47xx_wdt_stop(struct watchdog_device *wdd) |
90074dce | 109 | { |
110 | del_timer_sync(&wdt_timer); | |
111 | bcm47xx_wdt_hw_stop(); | |
90074dce | 112 | |
5434a04d | 113 | return 0; |
90074dce | 114 | } |
115 | ||
5434a04d HM |
116 | static int bcm47xx_wdt_set_timeout(struct watchdog_device *wdd, |
117 | unsigned int new_time) | |
90074dce | 118 | { |
119 | if ((new_time <= 0) || (new_time > WDT_MAX_TIME)) | |
120 | return -EINVAL; | |
121 | ||
122 | wdt_time = new_time; | |
123 | return 0; | |
124 | } | |
125 | ||
42747d71 | 126 | static const struct watchdog_info bcm47xx_wdt_info = { |
5f3b2756 WVS |
127 | .identity = DRV_NAME, |
128 | .options = WDIOF_SETTIMEOUT | | |
90074dce | 129 | WDIOF_KEEPALIVEPING | |
130 | WDIOF_MAGICCLOSE, | |
131 | }; | |
132 | ||
90074dce | 133 | static int bcm47xx_wdt_notify_sys(struct notifier_block *this, |
5434a04d | 134 | unsigned long code, void *unused) |
90074dce | 135 | { |
136 | if (code == SYS_DOWN || code == SYS_HALT) | |
137 | bcm47xx_wdt_stop(); | |
138 | return NOTIFY_DONE; | |
139 | } | |
140 | ||
5434a04d | 141 | static struct watchdog_ops bcm47xx_wdt_ops = { |
90074dce | 142 | .owner = THIS_MODULE, |
5434a04d HM |
143 | .start = bcm47xx_wdt_start, |
144 | .stop = bcm47xx_wdt_stop, | |
145 | .ping = bcm47xx_wdt_keepalive, | |
146 | .set_timeout = bcm47xx_wdt_set_timeout, | |
90074dce | 147 | }; |
148 | ||
5434a04d HM |
149 | static struct watchdog_device bcm47xx_wdt_wdd = { |
150 | .info = &bcm47xx_wdt_info, | |
151 | .ops = &bcm47xx_wdt_ops, | |
90074dce | 152 | }; |
153 | ||
154 | static struct notifier_block bcm47xx_wdt_notifier = { | |
155 | .notifier_call = bcm47xx_wdt_notify_sys, | |
156 | }; | |
157 | ||
158 | static int __init bcm47xx_wdt_init(void) | |
159 | { | |
160 | int ret; | |
161 | ||
162 | if (bcm47xx_wdt_hw_stop() < 0) | |
163 | return -ENODEV; | |
164 | ||
165 | setup_timer(&wdt_timer, bcm47xx_timer_tick, 0L); | |
166 | ||
167 | if (bcm47xx_wdt_settimeout(wdt_time)) { | |
168 | bcm47xx_wdt_settimeout(WDT_DEFAULT_TIME); | |
27c766aa | 169 | pr_info("wdt_time value must be 0 < wdt_time < %d, using %d\n", |
90074dce | 170 | (WDT_MAX_TIME + 1), wdt_time); |
171 | } | |
5434a04d | 172 | watchdog_set_nowayout(&bcm47xx_wdt_wdd, nowayout); |
90074dce | 173 | |
174 | ret = register_reboot_notifier(&bcm47xx_wdt_notifier); | |
175 | if (ret) | |
176 | return ret; | |
177 | ||
5434a04d | 178 | ret = watchdog_register_device(&bcm47xx_wdt_wdd); |
90074dce | 179 | if (ret) { |
180 | unregister_reboot_notifier(&bcm47xx_wdt_notifier); | |
181 | return ret; | |
182 | } | |
183 | ||
27c766aa JP |
184 | pr_info("BCM47xx Watchdog Timer enabled (%d seconds%s)\n", |
185 | wdt_time, nowayout ? ", nowayout" : ""); | |
90074dce | 186 | return 0; |
187 | } | |
188 | ||
189 | static void __exit bcm47xx_wdt_exit(void) | |
190 | { | |
5434a04d | 191 | watchdog_unregister_device(&bcm47xx_wdt_wdd); |
90074dce | 192 | |
193 | unregister_reboot_notifier(&bcm47xx_wdt_notifier); | |
194 | } | |
195 | ||
196 | module_init(bcm47xx_wdt_init); | |
197 | module_exit(bcm47xx_wdt_exit); | |
198 | ||
199 | MODULE_AUTHOR("Aleksandar Radovanovic"); | |
200 | MODULE_DESCRIPTION("Watchdog driver for Broadcom BCM47xx"); | |
201 | MODULE_LICENSE("GPL"); |