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/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 | ||
65a4a1dc DR |
90 | static int bcm47xx_wdt_restart(struct watchdog_device *wdd) |
91 | { | |
92 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); | |
93 | ||
94 | wdt->timer_set(wdt, 1); | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
e3e83d00 HM |
99 | static struct watchdog_ops bcm47xx_wdt_hard_ops = { |
100 | .owner = THIS_MODULE, | |
101 | .start = bcm47xx_wdt_hard_start, | |
102 | .stop = bcm47xx_wdt_hard_stop, | |
103 | .ping = bcm47xx_wdt_hard_keepalive, | |
104 | .set_timeout = bcm47xx_wdt_hard_set_timeout, | |
65a4a1dc | 105 | .restart = bcm47xx_wdt_restart, |
e3e83d00 HM |
106 | }; |
107 | ||
a3906892 | 108 | static void bcm47xx_wdt_soft_timer_tick(unsigned long data) |
90074dce | 109 | { |
f82dedf8 HM |
110 | struct bcm47xx_wdt *wdt = (struct bcm47xx_wdt *)data; |
111 | u32 next_tick = min(wdt->wdd.timeout * 1000, wdt->max_timer_ms); | |
90074dce | 112 | |
f82dedf8 HM |
113 | if (!atomic_dec_and_test(&wdt->soft_ticks)) { |
114 | wdt->timer_set_ms(wdt, next_tick); | |
115 | mod_timer(&wdt->soft_timer, jiffies + HZ); | |
90074dce | 116 | } else { |
27c766aa | 117 | pr_crit("Watchdog will fire soon!!!\n"); |
90074dce | 118 | } |
119 | } | |
120 | ||
a3906892 | 121 | static int bcm47xx_wdt_soft_keepalive(struct watchdog_device *wdd) |
90074dce | 122 | { |
f82dedf8 HM |
123 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); |
124 | ||
125 | atomic_set(&wdt->soft_ticks, wdd->timeout); | |
5434a04d HM |
126 | |
127 | return 0; | |
90074dce | 128 | } |
129 | ||
a3906892 | 130 | static int bcm47xx_wdt_soft_start(struct watchdog_device *wdd) |
90074dce | 131 | { |
f82dedf8 HM |
132 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); |
133 | ||
a3906892 HM |
134 | bcm47xx_wdt_soft_keepalive(wdd); |
135 | bcm47xx_wdt_soft_timer_tick((unsigned long)wdt); | |
5434a04d HM |
136 | |
137 | return 0; | |
90074dce | 138 | } |
139 | ||
a3906892 | 140 | static int bcm47xx_wdt_soft_stop(struct watchdog_device *wdd) |
90074dce | 141 | { |
f82dedf8 HM |
142 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); |
143 | ||
144 | del_timer_sync(&wdt->soft_timer); | |
145 | wdt->timer_set(wdt, 0); | |
90074dce | 146 | |
5434a04d | 147 | return 0; |
90074dce | 148 | } |
149 | ||
a3906892 HM |
150 | static int bcm47xx_wdt_soft_set_timeout(struct watchdog_device *wdd, |
151 | unsigned int new_time) | |
90074dce | 152 | { |
a3906892 | 153 | if (new_time < 1 || new_time > WDT_SOFTTIMER_MAX) { |
f82dedf8 | 154 | pr_warn("timeout value must be 1<=x<=%d, using %d\n", |
a3906892 | 155 | WDT_SOFTTIMER_MAX, new_time); |
90074dce | 156 | return -EINVAL; |
f82dedf8 | 157 | } |
90074dce | 158 | |
f82dedf8 | 159 | wdd->timeout = new_time; |
90074dce | 160 | return 0; |
161 | } | |
162 | ||
42747d71 | 163 | static const struct watchdog_info bcm47xx_wdt_info = { |
5f3b2756 WVS |
164 | .identity = DRV_NAME, |
165 | .options = WDIOF_SETTIMEOUT | | |
90074dce | 166 | WDIOF_KEEPALIVEPING | |
167 | WDIOF_MAGICCLOSE, | |
168 | }; | |
169 | ||
a3906892 | 170 | static struct watchdog_ops bcm47xx_wdt_soft_ops = { |
90074dce | 171 | .owner = THIS_MODULE, |
a3906892 HM |
172 | .start = bcm47xx_wdt_soft_start, |
173 | .stop = bcm47xx_wdt_soft_stop, | |
174 | .ping = bcm47xx_wdt_soft_keepalive, | |
175 | .set_timeout = bcm47xx_wdt_soft_set_timeout, | |
65a4a1dc | 176 | .restart = bcm47xx_wdt_restart, |
90074dce | 177 | }; |
178 | ||
f82dedf8 | 179 | static int bcm47xx_wdt_probe(struct platform_device *pdev) |
90074dce | 180 | { |
181 | int ret; | |
e3e83d00 | 182 | bool soft; |
f82dedf8 | 183 | struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev); |
90074dce | 184 | |
f82dedf8 HM |
185 | if (!wdt) |
186 | return -ENXIO; | |
90074dce | 187 | |
e3e83d00 HM |
188 | soft = wdt->max_timer_ms < WDT_SOFTTIMER_THRESHOLD * 1000; |
189 | ||
190 | if (soft) { | |
191 | wdt->wdd.ops = &bcm47xx_wdt_soft_ops; | |
192 | setup_timer(&wdt->soft_timer, bcm47xx_wdt_soft_timer_tick, | |
193 | (long unsigned int)wdt); | |
194 | } else { | |
195 | wdt->wdd.ops = &bcm47xx_wdt_hard_ops; | |
196 | } | |
90074dce | 197 | |
f82dedf8 HM |
198 | wdt->wdd.info = &bcm47xx_wdt_info; |
199 | wdt->wdd.timeout = WDT_DEFAULT_TIME; | |
6551881c | 200 | wdt->wdd.parent = &pdev->dev; |
f82dedf8 HM |
201 | ret = wdt->wdd.ops->set_timeout(&wdt->wdd, timeout); |
202 | if (ret) | |
203 | goto err_timer; | |
204 | watchdog_set_nowayout(&wdt->wdd, nowayout); | |
65a4a1dc | 205 | watchdog_set_restart_priority(&wdt->wdd, 64); |
2786aade | 206 | watchdog_stop_on_reboot(&wdt->wdd); |
90074dce | 207 | |
1cc7495c RM |
208 | ret = watchdog_register_device(&wdt->wdd); |
209 | if (ret) | |
2786aade | 210 | goto err_timer; |
1cc7495c | 211 | |
e3e83d00 HM |
212 | dev_info(&pdev->dev, "BCM47xx Watchdog Timer enabled (%d seconds%s%s)\n", |
213 | timeout, nowayout ? ", nowayout" : "", | |
214 | soft ? ", Software Timer" : ""); | |
90074dce | 215 | return 0; |
f82dedf8 | 216 | |
f82dedf8 | 217 | err_timer: |
e3e83d00 HM |
218 | if (soft) |
219 | del_timer_sync(&wdt->soft_timer); | |
f82dedf8 HM |
220 | |
221 | return ret; | |
90074dce | 222 | } |
223 | ||
f82dedf8 | 224 | static int bcm47xx_wdt_remove(struct platform_device *pdev) |
90074dce | 225 | { |
f82dedf8 HM |
226 | struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev); |
227 | ||
228 | if (!wdt) | |
229 | return -ENXIO; | |
230 | ||
231 | watchdog_unregister_device(&wdt->wdd); | |
90074dce | 232 | |
f82dedf8 | 233 | return 0; |
90074dce | 234 | } |
235 | ||
f82dedf8 HM |
236 | static struct platform_driver bcm47xx_wdt_driver = { |
237 | .driver = { | |
f82dedf8 HM |
238 | .name = "bcm47xx-wdt", |
239 | }, | |
240 | .probe = bcm47xx_wdt_probe, | |
241 | .remove = bcm47xx_wdt_remove, | |
242 | }; | |
243 | ||
244 | module_platform_driver(bcm47xx_wdt_driver); | |
90074dce | 245 | |
246 | MODULE_AUTHOR("Aleksandar Radovanovic"); | |
f82dedf8 | 247 | MODULE_AUTHOR("Hauke Mehrtens <hauke@hauke-m.de>"); |
90074dce | 248 | MODULE_DESCRIPTION("Watchdog driver for Broadcom BCM47xx"); |
249 | MODULE_LICENSE("GPL"); |