Commit | Line | Data |
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2e62c498 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
90074dce | 2 | /* |
3 | * Watchdog driver for Broadcom BCM47XX | |
4 | * | |
5 | * Copyright (C) 2008 Aleksandar Radovanovic <biblbroks@sezampro.rs> | |
6 | * Copyright (C) 2009 Matthieu CASTET <castet.matthieu@free.fr> | |
f82dedf8 | 7 | * Copyright (C) 2012-2013 Hauke Mehrtens <hauke@hauke-m.de> |
90074dce | 8 | * |
90074dce | 9 | */ |
10 | ||
27c766aa JP |
11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
12 | ||
f82dedf8 | 13 | #include <linux/bcm47xx_wdt.h> |
90074dce | 14 | #include <linux/bitops.h> |
15 | #include <linux/errno.h> | |
90074dce | 16 | #include <linux/kernel.h> |
90074dce | 17 | #include <linux/module.h> |
18 | #include <linux/moduleparam.h> | |
f82dedf8 | 19 | #include <linux/platform_device.h> |
90074dce | 20 | #include <linux/types.h> |
90074dce | 21 | #include <linux/watchdog.h> |
22 | #include <linux/timer.h> | |
23 | #include <linux/jiffies.h> | |
90074dce | 24 | |
25 | #define DRV_NAME "bcm47xx_wdt" | |
26 | ||
27 | #define WDT_DEFAULT_TIME 30 /* seconds */ | |
a3906892 | 28 | #define WDT_SOFTTIMER_MAX 255 /* seconds */ |
e3e83d00 | 29 | #define WDT_SOFTTIMER_THRESHOLD 60 /* seconds */ |
90074dce | 30 | |
93aed1f0 | 31 | static int timeout = WDT_DEFAULT_TIME; |
86a1e189 | 32 | static bool nowayout = WATCHDOG_NOWAYOUT; |
90074dce | 33 | |
93aed1f0 HM |
34 | module_param(timeout, int, 0); |
35 | MODULE_PARM_DESC(timeout, "Watchdog time in seconds. (default=" | |
90074dce | 36 | __MODULE_STRING(WDT_DEFAULT_TIME) ")"); |
37 | ||
86a1e189 | 38 | module_param(nowayout, bool, 0); |
90074dce | 39 | MODULE_PARM_DESC(nowayout, |
40 | "Watchdog cannot be stopped once started (default=" | |
41 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
90074dce | 42 | |
f82dedf8 | 43 | static inline struct bcm47xx_wdt *bcm47xx_wdt_get(struct watchdog_device *wdd) |
90074dce | 44 | { |
f82dedf8 | 45 | return container_of(wdd, struct bcm47xx_wdt, wdd); |
90074dce | 46 | } |
47 | ||
e3e83d00 HM |
48 | static int bcm47xx_wdt_hard_keepalive(struct watchdog_device *wdd) |
49 | { | |
50 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); | |
51 | ||
52 | wdt->timer_set_ms(wdt, wdd->timeout * 1000); | |
53 | ||
54 | return 0; | |
55 | } | |
56 | ||
57 | static int bcm47xx_wdt_hard_start(struct watchdog_device *wdd) | |
58 | { | |
59 | return 0; | |
60 | } | |
61 | ||
62 | static int bcm47xx_wdt_hard_stop(struct watchdog_device *wdd) | |
63 | { | |
64 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); | |
65 | ||
66 | wdt->timer_set(wdt, 0); | |
67 | ||
68 | return 0; | |
69 | } | |
70 | ||
71 | static int bcm47xx_wdt_hard_set_timeout(struct watchdog_device *wdd, | |
72 | unsigned int new_time) | |
73 | { | |
74 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); | |
75 | u32 max_timer = wdt->max_timer_ms; | |
76 | ||
77 | if (new_time < 1 || new_time > max_timer / 1000) { | |
78 | pr_warn("timeout value must be 1<=x<=%d, using %d\n", | |
79 | max_timer / 1000, new_time); | |
80 | return -EINVAL; | |
81 | } | |
82 | ||
83 | wdd->timeout = new_time; | |
84 | return 0; | |
85 | } | |
86 | ||
4d8b229d GR |
87 | static int bcm47xx_wdt_restart(struct watchdog_device *wdd, |
88 | unsigned long action, void *data) | |
65a4a1dc DR |
89 | { |
90 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); | |
91 | ||
92 | wdt->timer_set(wdt, 1); | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
d34f1f48 | 97 | static const struct watchdog_ops bcm47xx_wdt_hard_ops = { |
e3e83d00 HM |
98 | .owner = THIS_MODULE, |
99 | .start = bcm47xx_wdt_hard_start, | |
100 | .stop = bcm47xx_wdt_hard_stop, | |
101 | .ping = bcm47xx_wdt_hard_keepalive, | |
102 | .set_timeout = bcm47xx_wdt_hard_set_timeout, | |
65a4a1dc | 103 | .restart = bcm47xx_wdt_restart, |
e3e83d00 HM |
104 | }; |
105 | ||
e99e88a9 | 106 | static void bcm47xx_wdt_soft_timer_tick(struct timer_list *t) |
90074dce | 107 | { |
e99e88a9 | 108 | struct bcm47xx_wdt *wdt = from_timer(wdt, t, soft_timer); |
f82dedf8 | 109 | u32 next_tick = min(wdt->wdd.timeout * 1000, wdt->max_timer_ms); |
90074dce | 110 | |
f82dedf8 HM |
111 | if (!atomic_dec_and_test(&wdt->soft_ticks)) { |
112 | wdt->timer_set_ms(wdt, next_tick); | |
113 | mod_timer(&wdt->soft_timer, jiffies + HZ); | |
90074dce | 114 | } else { |
27c766aa | 115 | pr_crit("Watchdog will fire soon!!!\n"); |
90074dce | 116 | } |
117 | } | |
118 | ||
a3906892 | 119 | static int bcm47xx_wdt_soft_keepalive(struct watchdog_device *wdd) |
90074dce | 120 | { |
f82dedf8 HM |
121 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); |
122 | ||
123 | atomic_set(&wdt->soft_ticks, wdd->timeout); | |
5434a04d HM |
124 | |
125 | return 0; | |
90074dce | 126 | } |
127 | ||
a3906892 | 128 | static int bcm47xx_wdt_soft_start(struct watchdog_device *wdd) |
90074dce | 129 | { |
f82dedf8 HM |
130 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); |
131 | ||
a3906892 | 132 | bcm47xx_wdt_soft_keepalive(wdd); |
e99e88a9 | 133 | bcm47xx_wdt_soft_timer_tick(&wdt->soft_timer); |
5434a04d HM |
134 | |
135 | return 0; | |
90074dce | 136 | } |
137 | ||
a3906892 | 138 | static int bcm47xx_wdt_soft_stop(struct watchdog_device *wdd) |
90074dce | 139 | { |
f82dedf8 HM |
140 | struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); |
141 | ||
142 | del_timer_sync(&wdt->soft_timer); | |
143 | wdt->timer_set(wdt, 0); | |
90074dce | 144 | |
5434a04d | 145 | return 0; |
90074dce | 146 | } |
147 | ||
a3906892 HM |
148 | static int bcm47xx_wdt_soft_set_timeout(struct watchdog_device *wdd, |
149 | unsigned int new_time) | |
90074dce | 150 | { |
a3906892 | 151 | if (new_time < 1 || new_time > WDT_SOFTTIMER_MAX) { |
f82dedf8 | 152 | pr_warn("timeout value must be 1<=x<=%d, using %d\n", |
a3906892 | 153 | WDT_SOFTTIMER_MAX, new_time); |
90074dce | 154 | return -EINVAL; |
f82dedf8 | 155 | } |
90074dce | 156 | |
f82dedf8 | 157 | wdd->timeout = new_time; |
90074dce | 158 | return 0; |
159 | } | |
160 | ||
42747d71 | 161 | static const struct watchdog_info bcm47xx_wdt_info = { |
5f3b2756 WVS |
162 | .identity = DRV_NAME, |
163 | .options = WDIOF_SETTIMEOUT | | |
90074dce | 164 | WDIOF_KEEPALIVEPING | |
165 | WDIOF_MAGICCLOSE, | |
166 | }; | |
167 | ||
d34f1f48 | 168 | static const struct watchdog_ops bcm47xx_wdt_soft_ops = { |
90074dce | 169 | .owner = THIS_MODULE, |
a3906892 HM |
170 | .start = bcm47xx_wdt_soft_start, |
171 | .stop = bcm47xx_wdt_soft_stop, | |
172 | .ping = bcm47xx_wdt_soft_keepalive, | |
173 | .set_timeout = bcm47xx_wdt_soft_set_timeout, | |
65a4a1dc | 174 | .restart = bcm47xx_wdt_restart, |
90074dce | 175 | }; |
176 | ||
f82dedf8 | 177 | static int bcm47xx_wdt_probe(struct platform_device *pdev) |
90074dce | 178 | { |
179 | int ret; | |
e3e83d00 | 180 | bool soft; |
f82dedf8 | 181 | struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev); |
90074dce | 182 | |
f82dedf8 HM |
183 | if (!wdt) |
184 | return -ENXIO; | |
90074dce | 185 | |
e3e83d00 HM |
186 | soft = wdt->max_timer_ms < WDT_SOFTTIMER_THRESHOLD * 1000; |
187 | ||
188 | if (soft) { | |
189 | wdt->wdd.ops = &bcm47xx_wdt_soft_ops; | |
e99e88a9 | 190 | timer_setup(&wdt->soft_timer, bcm47xx_wdt_soft_timer_tick, 0); |
e3e83d00 HM |
191 | } else { |
192 | wdt->wdd.ops = &bcm47xx_wdt_hard_ops; | |
193 | } | |
90074dce | 194 | |
f82dedf8 HM |
195 | wdt->wdd.info = &bcm47xx_wdt_info; |
196 | wdt->wdd.timeout = WDT_DEFAULT_TIME; | |
6551881c | 197 | wdt->wdd.parent = &pdev->dev; |
f82dedf8 HM |
198 | ret = wdt->wdd.ops->set_timeout(&wdt->wdd, timeout); |
199 | if (ret) | |
200 | goto err_timer; | |
201 | watchdog_set_nowayout(&wdt->wdd, nowayout); | |
65a4a1dc | 202 | watchdog_set_restart_priority(&wdt->wdd, 64); |
2786aade | 203 | watchdog_stop_on_reboot(&wdt->wdd); |
90074dce | 204 | |
1cc7495c RM |
205 | ret = watchdog_register_device(&wdt->wdd); |
206 | if (ret) | |
2786aade | 207 | goto err_timer; |
1cc7495c | 208 | |
e3e83d00 HM |
209 | dev_info(&pdev->dev, "BCM47xx Watchdog Timer enabled (%d seconds%s%s)\n", |
210 | timeout, nowayout ? ", nowayout" : "", | |
211 | soft ? ", Software Timer" : ""); | |
90074dce | 212 | return 0; |
f82dedf8 | 213 | |
f82dedf8 | 214 | err_timer: |
e3e83d00 HM |
215 | if (soft) |
216 | del_timer_sync(&wdt->soft_timer); | |
f82dedf8 HM |
217 | |
218 | return ret; | |
90074dce | 219 | } |
220 | ||
f82dedf8 | 221 | static int bcm47xx_wdt_remove(struct platform_device *pdev) |
90074dce | 222 | { |
f82dedf8 HM |
223 | struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev); |
224 | ||
f82dedf8 | 225 | watchdog_unregister_device(&wdt->wdd); |
90074dce | 226 | |
f82dedf8 | 227 | return 0; |
90074dce | 228 | } |
229 | ||
f82dedf8 HM |
230 | static struct platform_driver bcm47xx_wdt_driver = { |
231 | .driver = { | |
f82dedf8 HM |
232 | .name = "bcm47xx-wdt", |
233 | }, | |
234 | .probe = bcm47xx_wdt_probe, | |
235 | .remove = bcm47xx_wdt_remove, | |
236 | }; | |
237 | ||
238 | module_platform_driver(bcm47xx_wdt_driver); | |
90074dce | 239 | |
240 | MODULE_AUTHOR("Aleksandar Radovanovic"); | |
f82dedf8 | 241 | MODULE_AUTHOR("Hauke Mehrtens <hauke@hauke-m.de>"); |
90074dce | 242 | MODULE_DESCRIPTION("Watchdog driver for Broadcom BCM47xx"); |
243 | MODULE_LICENSE("GPL"); |