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/kernel.h> |
90074dce | 20 | #include <linux/module.h> |
21 | #include <linux/moduleparam.h> | |
f82dedf8 | 22 | #include <linux/platform_device.h> |
90074dce | 23 | #include <linux/types.h> |
90074dce | 24 | #include <linux/watchdog.h> |
25 | #include <linux/timer.h> | |
26 | #include <linux/jiffies.h> | |
90074dce | 27 | |
28 | #define DRV_NAME "bcm47xx_wdt" | |
29 | ||
30 | #define WDT_DEFAULT_TIME 30 /* seconds */ | |
a3906892 | 31 | #define WDT_SOFTTIMER_MAX 255 /* seconds */ |
e3e83d00 | 32 | #define WDT_SOFTTIMER_THRESHOLD 60 /* seconds */ |
90074dce | 33 | |
93aed1f0 | 34 | static int timeout = WDT_DEFAULT_TIME; |
86a1e189 | 35 | static bool nowayout = WATCHDOG_NOWAYOUT; |
90074dce | 36 | |
93aed1f0 HM |
37 | module_param(timeout, int, 0); |
38 | MODULE_PARM_DESC(timeout, "Watchdog time in seconds. (default=" | |
90074dce | 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 | |
f82dedf8 | 46 | static inline struct bcm47xx_wdt *bcm47xx_wdt_get(struct watchdog_device *wdd) |
90074dce | 47 | { |
f82dedf8 | 48 | return container_of(wdd, struct bcm47xx_wdt, wdd); |
90074dce | 49 | } |
50 | ||
e3e83d00 HM |
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 | ||
4d8b229d GR |
90 | static int bcm47xx_wdt_restart(struct watchdog_device *wdd, |
91 | unsigned long action, void *data) | |
65a4a1dc DR |
92 | { |
93 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); | |
94 | ||
95 | wdt->timer_set(wdt, 1); | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
e3e83d00 HM |
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, | |
65a4a1dc | 106 | .restart = bcm47xx_wdt_restart, |
e3e83d00 HM |
107 | }; |
108 | ||
a3906892 | 109 | static void bcm47xx_wdt_soft_timer_tick(unsigned long data) |
90074dce | 110 | { |
f82dedf8 HM |
111 | struct bcm47xx_wdt *wdt = (struct bcm47xx_wdt *)data; |
112 | u32 next_tick = min(wdt->wdd.timeout * 1000, wdt->max_timer_ms); | |
90074dce | 113 | |
f82dedf8 HM |
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); | |
90074dce | 117 | } else { |
27c766aa | 118 | pr_crit("Watchdog will fire soon!!!\n"); |
90074dce | 119 | } |
120 | } | |
121 | ||
a3906892 | 122 | static int bcm47xx_wdt_soft_keepalive(struct watchdog_device *wdd) |
90074dce | 123 | { |
f82dedf8 HM |
124 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); |
125 | ||
126 | atomic_set(&wdt->soft_ticks, wdd->timeout); | |
5434a04d HM |
127 | |
128 | return 0; | |
90074dce | 129 | } |
130 | ||
a3906892 | 131 | static int bcm47xx_wdt_soft_start(struct watchdog_device *wdd) |
90074dce | 132 | { |
f82dedf8 HM |
133 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); |
134 | ||
a3906892 HM |
135 | bcm47xx_wdt_soft_keepalive(wdd); |
136 | bcm47xx_wdt_soft_timer_tick((unsigned long)wdt); | |
5434a04d HM |
137 | |
138 | return 0; | |
90074dce | 139 | } |
140 | ||
a3906892 | 141 | static int bcm47xx_wdt_soft_stop(struct watchdog_device *wdd) |
90074dce | 142 | { |
f82dedf8 HM |
143 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); |
144 | ||
145 | del_timer_sync(&wdt->soft_timer); | |
146 | wdt->timer_set(wdt, 0); | |
90074dce | 147 | |
5434a04d | 148 | return 0; |
90074dce | 149 | } |
150 | ||
a3906892 HM |
151 | static int bcm47xx_wdt_soft_set_timeout(struct watchdog_device *wdd, |
152 | unsigned int new_time) | |
90074dce | 153 | { |
a3906892 | 154 | if (new_time < 1 || new_time > WDT_SOFTTIMER_MAX) { |
f82dedf8 | 155 | pr_warn("timeout value must be 1<=x<=%d, using %d\n", |
a3906892 | 156 | WDT_SOFTTIMER_MAX, new_time); |
90074dce | 157 | return -EINVAL; |
f82dedf8 | 158 | } |
90074dce | 159 | |
f82dedf8 | 160 | wdd->timeout = new_time; |
90074dce | 161 | return 0; |
162 | } | |
163 | ||
42747d71 | 164 | static const struct watchdog_info bcm47xx_wdt_info = { |
5f3b2756 WVS |
165 | .identity = DRV_NAME, |
166 | .options = WDIOF_SETTIMEOUT | | |
90074dce | 167 | WDIOF_KEEPALIVEPING | |
168 | WDIOF_MAGICCLOSE, | |
169 | }; | |
170 | ||
a3906892 | 171 | static struct watchdog_ops bcm47xx_wdt_soft_ops = { |
90074dce | 172 | .owner = THIS_MODULE, |
a3906892 HM |
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, | |
65a4a1dc | 177 | .restart = bcm47xx_wdt_restart, |
90074dce | 178 | }; |
179 | ||
f82dedf8 | 180 | static int bcm47xx_wdt_probe(struct platform_device *pdev) |
90074dce | 181 | { |
182 | int ret; | |
e3e83d00 | 183 | bool soft; |
f82dedf8 | 184 | struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev); |
90074dce | 185 | |
f82dedf8 HM |
186 | if (!wdt) |
187 | return -ENXIO; | |
90074dce | 188 | |
e3e83d00 HM |
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 | } | |
90074dce | 198 | |
f82dedf8 HM |
199 | wdt->wdd.info = &bcm47xx_wdt_info; |
200 | wdt->wdd.timeout = WDT_DEFAULT_TIME; | |
6551881c | 201 | wdt->wdd.parent = &pdev->dev; |
f82dedf8 HM |
202 | ret = wdt->wdd.ops->set_timeout(&wdt->wdd, timeout); |
203 | if (ret) | |
204 | goto err_timer; | |
205 | watchdog_set_nowayout(&wdt->wdd, nowayout); | |
65a4a1dc | 206 | watchdog_set_restart_priority(&wdt->wdd, 64); |
2786aade | 207 | watchdog_stop_on_reboot(&wdt->wdd); |
90074dce | 208 | |
1cc7495c RM |
209 | ret = watchdog_register_device(&wdt->wdd); |
210 | if (ret) | |
2786aade | 211 | goto err_timer; |
1cc7495c | 212 | |
e3e83d00 HM |
213 | dev_info(&pdev->dev, "BCM47xx Watchdog Timer enabled (%d seconds%s%s)\n", |
214 | timeout, nowayout ? ", nowayout" : "", | |
215 | soft ? ", Software Timer" : ""); | |
90074dce | 216 | return 0; |
f82dedf8 | 217 | |
f82dedf8 | 218 | err_timer: |
e3e83d00 HM |
219 | if (soft) |
220 | del_timer_sync(&wdt->soft_timer); | |
f82dedf8 HM |
221 | |
222 | return ret; | |
90074dce | 223 | } |
224 | ||
f82dedf8 | 225 | static int bcm47xx_wdt_remove(struct platform_device *pdev) |
90074dce | 226 | { |
f82dedf8 HM |
227 | struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev); |
228 | ||
229 | if (!wdt) | |
230 | return -ENXIO; | |
231 | ||
232 | watchdog_unregister_device(&wdt->wdd); | |
90074dce | 233 | |
f82dedf8 | 234 | return 0; |
90074dce | 235 | } |
236 | ||
f82dedf8 HM |
237 | static struct platform_driver bcm47xx_wdt_driver = { |
238 | .driver = { | |
f82dedf8 HM |
239 | .name = "bcm47xx-wdt", |
240 | }, | |
241 | .probe = bcm47xx_wdt_probe, | |
242 | .remove = bcm47xx_wdt_remove, | |
243 | }; | |
244 | ||
245 | module_platform_driver(bcm47xx_wdt_driver); | |
90074dce | 246 | |
247 | MODULE_AUTHOR("Aleksandar Radovanovic"); | |
f82dedf8 | 248 | MODULE_AUTHOR("Hauke Mehrtens <hauke@hauke-m.de>"); |
90074dce | 249 | MODULE_DESCRIPTION("Watchdog driver for Broadcom BCM47xx"); |
250 | MODULE_LICENSE("GPL"); |