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9f806850 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e51c288e KS |
2 | /* |
3 | * Kontron PLD watchdog driver | |
4 | * | |
5 | * Copyright (c) 2010-2013 Kontron Europe GmbH | |
6 | * Author: Michael Brunner <michael.brunner@kontron.com> | |
7 | * | |
e51c288e KS |
8 | * Note: From the PLD watchdog point of view timeout and pretimeout are |
9 | * defined differently than in the kernel. | |
10 | * First the pretimeout stage runs out before the timeout stage gets | |
11 | * active. | |
12 | * | |
13 | * Kernel/API: P-----| pretimeout | |
14 | * |-----------------------T timeout | |
15 | * Watchdog: |-----------------P pretimeout_stage | |
16 | * |-----T timeout_stage | |
17 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/moduleparam.h> | |
e51c288e KS |
21 | #include <linux/uaccess.h> |
22 | #include <linux/watchdog.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/mfd/kempld.h> | |
25 | ||
26 | #define KEMPLD_WDT_STAGE_TIMEOUT(x) (0x1b + (x) * 4) | |
27 | #define KEMPLD_WDT_STAGE_CFG(x) (0x18 + (x)) | |
28 | #define STAGE_CFG_GET_PRESCALER(x) (((x) & 0x30) >> 4) | |
4c4e4566 | 29 | #define STAGE_CFG_SET_PRESCALER(x) (((x) & 0x3) << 4) |
e51c288e KS |
30 | #define STAGE_CFG_PRESCALER_MASK 0x30 |
31 | #define STAGE_CFG_ACTION_MASK 0x7 | |
32 | #define STAGE_CFG_ASSERT (1 << 3) | |
33 | ||
34 | #define KEMPLD_WDT_MAX_STAGES 2 | |
35 | #define KEMPLD_WDT_KICK 0x16 | |
36 | #define KEMPLD_WDT_CFG 0x17 | |
37 | #define KEMPLD_WDT_CFG_ENABLE 0x10 | |
38 | #define KEMPLD_WDT_CFG_ENABLE_LOCK 0x8 | |
39 | #define KEMPLD_WDT_CFG_GLOBAL_LOCK 0x80 | |
40 | ||
41 | enum { | |
42 | ACTION_NONE = 0, | |
43 | ACTION_RESET, | |
44 | ACTION_NMI, | |
45 | ACTION_SMI, | |
46 | ACTION_SCI, | |
47 | ACTION_DELAY, | |
48 | }; | |
49 | ||
50 | enum { | |
51 | STAGE_TIMEOUT = 0, | |
52 | STAGE_PRETIMEOUT, | |
53 | }; | |
54 | ||
55 | enum { | |
56 | PRESCALER_21 = 0, | |
57 | PRESCALER_17, | |
58 | PRESCALER_12, | |
59 | }; | |
60 | ||
b3970bde | 61 | static const u32 kempld_prescaler[] = { |
e51c288e KS |
62 | [PRESCALER_21] = (1 << 21) - 1, |
63 | [PRESCALER_17] = (1 << 17) - 1, | |
64 | [PRESCALER_12] = (1 << 12) - 1, | |
65 | 0, | |
66 | }; | |
67 | ||
68 | struct kempld_wdt_stage { | |
69 | unsigned int id; | |
70 | u32 mask; | |
71 | }; | |
72 | ||
73 | struct kempld_wdt_data { | |
74 | struct kempld_device_data *pld; | |
75 | struct watchdog_device wdd; | |
76 | unsigned int pretimeout; | |
77 | struct kempld_wdt_stage stage[KEMPLD_WDT_MAX_STAGES]; | |
78 | #ifdef CONFIG_PM | |
79 | u8 pm_status_store; | |
80 | #endif | |
81 | }; | |
82 | ||
83 | #define DEFAULT_TIMEOUT 30 /* seconds */ | |
84 | #define DEFAULT_PRETIMEOUT 0 | |
85 | ||
86 | static unsigned int timeout = DEFAULT_TIMEOUT; | |
87 | module_param(timeout, uint, 0); | |
88 | MODULE_PARM_DESC(timeout, | |
89 | "Watchdog timeout in seconds. (>=0, default=" | |
90 | __MODULE_STRING(DEFAULT_TIMEOUT) ")"); | |
91 | ||
92 | static unsigned int pretimeout = DEFAULT_PRETIMEOUT; | |
93 | module_param(pretimeout, uint, 0); | |
94 | MODULE_PARM_DESC(pretimeout, | |
95 | "Watchdog pretimeout in seconds. (>=0, default=" | |
96 | __MODULE_STRING(DEFAULT_PRETIMEOUT) ")"); | |
97 | ||
98 | static bool nowayout = WATCHDOG_NOWAYOUT; | |
99 | module_param(nowayout, bool, 0); | |
100 | MODULE_PARM_DESC(nowayout, | |
101 | "Watchdog cannot be stopped once started (default=" | |
102 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
103 | ||
104 | static int kempld_wdt_set_stage_action(struct kempld_wdt_data *wdt_data, | |
105 | struct kempld_wdt_stage *stage, | |
106 | u8 action) | |
107 | { | |
108 | struct kempld_device_data *pld = wdt_data->pld; | |
109 | u8 stage_cfg; | |
110 | ||
111 | if (!stage || !stage->mask) | |
112 | return -EINVAL; | |
113 | ||
114 | kempld_get_mutex(pld); | |
115 | stage_cfg = kempld_read8(pld, KEMPLD_WDT_STAGE_CFG(stage->id)); | |
116 | stage_cfg &= ~STAGE_CFG_ACTION_MASK; | |
117 | stage_cfg |= (action & STAGE_CFG_ACTION_MASK); | |
118 | ||
119 | if (action == ACTION_RESET) | |
120 | stage_cfg |= STAGE_CFG_ASSERT; | |
121 | else | |
122 | stage_cfg &= ~STAGE_CFG_ASSERT; | |
123 | ||
124 | kempld_write8(pld, KEMPLD_WDT_STAGE_CFG(stage->id), stage_cfg); | |
125 | kempld_release_mutex(pld); | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | static int kempld_wdt_set_stage_timeout(struct kempld_wdt_data *wdt_data, | |
131 | struct kempld_wdt_stage *stage, | |
132 | unsigned int timeout) | |
133 | { | |
134 | struct kempld_device_data *pld = wdt_data->pld; | |
3736d4eb | 135 | u32 prescaler; |
e51c288e KS |
136 | u64 stage_timeout64; |
137 | u32 stage_timeout; | |
138 | u32 remainder; | |
139 | u8 stage_cfg; | |
140 | ||
3736d4eb | 141 | prescaler = kempld_prescaler[PRESCALER_21]; |
3736d4eb | 142 | |
e51c288e KS |
143 | if (!stage) |
144 | return -EINVAL; | |
145 | ||
146 | stage_timeout64 = (u64)timeout * pld->pld_clock; | |
147 | remainder = do_div(stage_timeout64, prescaler); | |
148 | if (remainder) | |
149 | stage_timeout64++; | |
150 | ||
151 | if (stage_timeout64 > stage->mask) | |
152 | return -EINVAL; | |
153 | ||
154 | stage_timeout = stage_timeout64 & stage->mask; | |
155 | ||
156 | kempld_get_mutex(pld); | |
157 | stage_cfg = kempld_read8(pld, KEMPLD_WDT_STAGE_CFG(stage->id)); | |
158 | stage_cfg &= ~STAGE_CFG_PRESCALER_MASK; | |
a9e0436b | 159 | stage_cfg |= STAGE_CFG_SET_PRESCALER(PRESCALER_21); |
e51c288e KS |
160 | kempld_write8(pld, KEMPLD_WDT_STAGE_CFG(stage->id), stage_cfg); |
161 | kempld_write32(pld, KEMPLD_WDT_STAGE_TIMEOUT(stage->id), | |
162 | stage_timeout); | |
163 | kempld_release_mutex(pld); | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
168 | /* | |
169 | * kempld_get_mutex must be called prior to calling this function. | |
170 | */ | |
171 | static unsigned int kempld_wdt_get_timeout(struct kempld_wdt_data *wdt_data, | |
172 | struct kempld_wdt_stage *stage) | |
173 | { | |
174 | struct kempld_device_data *pld = wdt_data->pld; | |
175 | unsigned int timeout; | |
176 | u64 stage_timeout; | |
177 | u32 prescaler; | |
178 | u32 remainder; | |
179 | u8 stage_cfg; | |
180 | ||
181 | if (!stage->mask) | |
182 | return 0; | |
183 | ||
184 | stage_cfg = kempld_read8(pld, KEMPLD_WDT_STAGE_CFG(stage->id)); | |
185 | stage_timeout = kempld_read32(pld, KEMPLD_WDT_STAGE_TIMEOUT(stage->id)); | |
186 | prescaler = kempld_prescaler[STAGE_CFG_GET_PRESCALER(stage_cfg)]; | |
187 | ||
188 | stage_timeout = (stage_timeout & stage->mask) * prescaler; | |
189 | remainder = do_div(stage_timeout, pld->pld_clock); | |
190 | if (remainder) | |
191 | stage_timeout++; | |
192 | ||
193 | timeout = stage_timeout; | |
194 | WARN_ON_ONCE(timeout != stage_timeout); | |
195 | ||
196 | return timeout; | |
197 | } | |
198 | ||
199 | static int kempld_wdt_set_timeout(struct watchdog_device *wdd, | |
200 | unsigned int timeout) | |
201 | { | |
202 | struct kempld_wdt_data *wdt_data = watchdog_get_drvdata(wdd); | |
203 | struct kempld_wdt_stage *pretimeout_stage; | |
204 | struct kempld_wdt_stage *timeout_stage; | |
205 | int ret; | |
206 | ||
207 | timeout_stage = &wdt_data->stage[STAGE_TIMEOUT]; | |
208 | pretimeout_stage = &wdt_data->stage[STAGE_PRETIMEOUT]; | |
209 | ||
210 | if (pretimeout_stage->mask && wdt_data->pretimeout > 0) | |
211 | timeout = wdt_data->pretimeout; | |
212 | ||
213 | ret = kempld_wdt_set_stage_action(wdt_data, timeout_stage, | |
214 | ACTION_RESET); | |
215 | if (ret) | |
216 | return ret; | |
217 | ret = kempld_wdt_set_stage_timeout(wdt_data, timeout_stage, | |
218 | timeout); | |
219 | if (ret) | |
220 | return ret; | |
221 | ||
222 | wdd->timeout = timeout; | |
223 | return 0; | |
224 | } | |
225 | ||
226 | static int kempld_wdt_set_pretimeout(struct watchdog_device *wdd, | |
227 | unsigned int pretimeout) | |
228 | { | |
229 | struct kempld_wdt_data *wdt_data = watchdog_get_drvdata(wdd); | |
230 | struct kempld_wdt_stage *pretimeout_stage; | |
231 | u8 action = ACTION_NONE; | |
232 | int ret; | |
233 | ||
234 | pretimeout_stage = &wdt_data->stage[STAGE_PRETIMEOUT]; | |
235 | ||
236 | if (!pretimeout_stage->mask) | |
237 | return -ENXIO; | |
238 | ||
239 | if (pretimeout > wdd->timeout) | |
240 | return -EINVAL; | |
241 | ||
242 | if (pretimeout > 0) | |
243 | action = ACTION_NMI; | |
244 | ||
245 | ret = kempld_wdt_set_stage_action(wdt_data, pretimeout_stage, | |
246 | action); | |
247 | if (ret) | |
248 | return ret; | |
249 | ret = kempld_wdt_set_stage_timeout(wdt_data, pretimeout_stage, | |
250 | wdd->timeout - pretimeout); | |
251 | if (ret) | |
252 | return ret; | |
253 | ||
254 | wdt_data->pretimeout = pretimeout; | |
255 | return 0; | |
256 | } | |
257 | ||
258 | static void kempld_wdt_update_timeouts(struct kempld_wdt_data *wdt_data) | |
259 | { | |
260 | struct kempld_device_data *pld = wdt_data->pld; | |
261 | struct kempld_wdt_stage *pretimeout_stage; | |
262 | struct kempld_wdt_stage *timeout_stage; | |
263 | unsigned int pretimeout, timeout; | |
264 | ||
265 | pretimeout_stage = &wdt_data->stage[STAGE_PRETIMEOUT]; | |
266 | timeout_stage = &wdt_data->stage[STAGE_TIMEOUT]; | |
267 | ||
268 | kempld_get_mutex(pld); | |
269 | pretimeout = kempld_wdt_get_timeout(wdt_data, pretimeout_stage); | |
270 | timeout = kempld_wdt_get_timeout(wdt_data, timeout_stage); | |
271 | kempld_release_mutex(pld); | |
272 | ||
273 | if (pretimeout) | |
274 | wdt_data->pretimeout = timeout; | |
275 | else | |
276 | wdt_data->pretimeout = 0; | |
277 | ||
278 | wdt_data->wdd.timeout = pretimeout + timeout; | |
279 | } | |
280 | ||
281 | static int kempld_wdt_start(struct watchdog_device *wdd) | |
282 | { | |
283 | struct kempld_wdt_data *wdt_data = watchdog_get_drvdata(wdd); | |
284 | struct kempld_device_data *pld = wdt_data->pld; | |
285 | u8 status; | |
286 | int ret; | |
287 | ||
288 | ret = kempld_wdt_set_timeout(wdd, wdd->timeout); | |
289 | if (ret) | |
290 | return ret; | |
291 | ||
292 | kempld_get_mutex(pld); | |
293 | status = kempld_read8(pld, KEMPLD_WDT_CFG); | |
294 | status |= KEMPLD_WDT_CFG_ENABLE; | |
295 | kempld_write8(pld, KEMPLD_WDT_CFG, status); | |
296 | status = kempld_read8(pld, KEMPLD_WDT_CFG); | |
297 | kempld_release_mutex(pld); | |
298 | ||
299 | /* Check if the watchdog was enabled */ | |
300 | if (!(status & KEMPLD_WDT_CFG_ENABLE)) | |
301 | return -EACCES; | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | static int kempld_wdt_stop(struct watchdog_device *wdd) | |
307 | { | |
308 | struct kempld_wdt_data *wdt_data = watchdog_get_drvdata(wdd); | |
309 | struct kempld_device_data *pld = wdt_data->pld; | |
310 | u8 status; | |
311 | ||
312 | kempld_get_mutex(pld); | |
313 | status = kempld_read8(pld, KEMPLD_WDT_CFG); | |
314 | status &= ~KEMPLD_WDT_CFG_ENABLE; | |
315 | kempld_write8(pld, KEMPLD_WDT_CFG, status); | |
316 | status = kempld_read8(pld, KEMPLD_WDT_CFG); | |
317 | kempld_release_mutex(pld); | |
318 | ||
319 | /* Check if the watchdog was disabled */ | |
320 | if (status & KEMPLD_WDT_CFG_ENABLE) | |
321 | return -EACCES; | |
322 | ||
323 | return 0; | |
324 | } | |
325 | ||
326 | static int kempld_wdt_keepalive(struct watchdog_device *wdd) | |
327 | { | |
328 | struct kempld_wdt_data *wdt_data = watchdog_get_drvdata(wdd); | |
329 | struct kempld_device_data *pld = wdt_data->pld; | |
330 | ||
331 | kempld_get_mutex(pld); | |
332 | kempld_write8(pld, KEMPLD_WDT_KICK, 'K'); | |
333 | kempld_release_mutex(pld); | |
334 | ||
335 | return 0; | |
336 | } | |
337 | ||
338 | static long kempld_wdt_ioctl(struct watchdog_device *wdd, unsigned int cmd, | |
339 | unsigned long arg) | |
340 | { | |
341 | struct kempld_wdt_data *wdt_data = watchdog_get_drvdata(wdd); | |
342 | void __user *argp = (void __user *)arg; | |
343 | int ret = -ENOIOCTLCMD; | |
344 | int __user *p = argp; | |
345 | int new_value; | |
346 | ||
347 | switch (cmd) { | |
348 | case WDIOC_SETPRETIMEOUT: | |
349 | if (get_user(new_value, p)) | |
350 | return -EFAULT; | |
351 | ret = kempld_wdt_set_pretimeout(wdd, new_value); | |
352 | if (ret) | |
353 | return ret; | |
354 | ret = kempld_wdt_keepalive(wdd); | |
355 | break; | |
356 | case WDIOC_GETPRETIMEOUT: | |
b3970bde | 357 | ret = put_user(wdt_data->pretimeout, (int __user *)arg); |
e51c288e KS |
358 | break; |
359 | } | |
360 | ||
361 | return ret; | |
362 | } | |
363 | ||
364 | static int kempld_wdt_probe_stages(struct watchdog_device *wdd) | |
365 | { | |
366 | struct kempld_wdt_data *wdt_data = watchdog_get_drvdata(wdd); | |
367 | struct kempld_device_data *pld = wdt_data->pld; | |
368 | struct kempld_wdt_stage *pretimeout_stage; | |
369 | struct kempld_wdt_stage *timeout_stage; | |
370 | u8 index, data, data_orig; | |
371 | u32 mask; | |
372 | int i, j; | |
373 | ||
374 | pretimeout_stage = &wdt_data->stage[STAGE_PRETIMEOUT]; | |
375 | timeout_stage = &wdt_data->stage[STAGE_TIMEOUT]; | |
376 | ||
377 | pretimeout_stage->mask = 0; | |
378 | timeout_stage->mask = 0; | |
379 | ||
380 | for (i = 0; i < 3; i++) { | |
381 | index = KEMPLD_WDT_STAGE_TIMEOUT(i); | |
382 | mask = 0; | |
383 | ||
384 | kempld_get_mutex(pld); | |
385 | /* Probe each byte individually. */ | |
386 | for (j = 0; j < 4; j++) { | |
387 | data_orig = kempld_read8(pld, index + j); | |
388 | kempld_write8(pld, index + j, 0x00); | |
389 | data = kempld_read8(pld, index + j); | |
390 | /* A failed write means this byte is reserved */ | |
391 | if (data != 0x00) | |
392 | break; | |
393 | kempld_write8(pld, index + j, data_orig); | |
394 | mask |= 0xff << (j * 8); | |
395 | } | |
396 | kempld_release_mutex(pld); | |
397 | ||
398 | /* Assign available stages to timeout and pretimeout */ | |
399 | if (!timeout_stage->mask) { | |
400 | timeout_stage->mask = mask; | |
401 | timeout_stage->id = i; | |
402 | } else { | |
403 | if (pld->feature_mask & KEMPLD_FEATURE_BIT_NMI) { | |
404 | pretimeout_stage->mask = timeout_stage->mask; | |
405 | timeout_stage->mask = mask; | |
406 | pretimeout_stage->id = timeout_stage->id; | |
407 | timeout_stage->id = i; | |
408 | } | |
409 | break; | |
410 | } | |
411 | } | |
412 | ||
413 | if (!timeout_stage->mask) | |
414 | return -ENODEV; | |
415 | ||
416 | return 0; | |
417 | } | |
418 | ||
6c368932 | 419 | static const struct watchdog_info kempld_wdt_info = { |
e51c288e KS |
420 | .identity = "KEMPLD Watchdog", |
421 | .options = WDIOF_SETTIMEOUT | | |
422 | WDIOF_KEEPALIVEPING | | |
423 | WDIOF_MAGICCLOSE | | |
424 | WDIOF_PRETIMEOUT | |
425 | }; | |
426 | ||
85f15cfc | 427 | static const struct watchdog_ops kempld_wdt_ops = { |
e51c288e KS |
428 | .owner = THIS_MODULE, |
429 | .start = kempld_wdt_start, | |
430 | .stop = kempld_wdt_stop, | |
431 | .ping = kempld_wdt_keepalive, | |
432 | .set_timeout = kempld_wdt_set_timeout, | |
433 | .ioctl = kempld_wdt_ioctl, | |
434 | }; | |
435 | ||
436 | static int kempld_wdt_probe(struct platform_device *pdev) | |
437 | { | |
438 | struct kempld_device_data *pld = dev_get_drvdata(pdev->dev.parent); | |
439 | struct kempld_wdt_data *wdt_data; | |
440 | struct device *dev = &pdev->dev; | |
441 | struct watchdog_device *wdd; | |
442 | u8 status; | |
443 | int ret = 0; | |
444 | ||
445 | wdt_data = devm_kzalloc(dev, sizeof(*wdt_data), GFP_KERNEL); | |
446 | if (!wdt_data) | |
447 | return -ENOMEM; | |
448 | ||
449 | wdt_data->pld = pld; | |
450 | wdd = &wdt_data->wdd; | |
451 | wdd->parent = dev; | |
452 | ||
453 | kempld_get_mutex(pld); | |
454 | status = kempld_read8(pld, KEMPLD_WDT_CFG); | |
455 | kempld_release_mutex(pld); | |
456 | ||
457 | /* Enable nowayout if watchdog is already locked */ | |
458 | if (status & (KEMPLD_WDT_CFG_ENABLE_LOCK | | |
459 | KEMPLD_WDT_CFG_GLOBAL_LOCK)) { | |
460 | if (!nowayout) | |
461 | dev_warn(dev, | |
4689ba97 | 462 | "Forcing nowayout - watchdog lock enabled!\n"); |
e51c288e KS |
463 | nowayout = true; |
464 | } | |
465 | ||
466 | wdd->info = &kempld_wdt_info; | |
467 | wdd->ops = &kempld_wdt_ops; | |
468 | ||
469 | watchdog_set_drvdata(wdd, wdt_data); | |
470 | watchdog_set_nowayout(wdd, nowayout); | |
471 | ||
472 | ret = kempld_wdt_probe_stages(wdd); | |
473 | if (ret) | |
474 | return ret; | |
475 | ||
476 | kempld_wdt_set_timeout(wdd, timeout); | |
477 | kempld_wdt_set_pretimeout(wdd, pretimeout); | |
478 | ||
479 | /* Check if watchdog is already enabled */ | |
480 | if (status & KEMPLD_WDT_CFG_ENABLE) { | |
481 | /* Get current watchdog settings */ | |
482 | kempld_wdt_update_timeouts(wdt_data); | |
483 | dev_info(dev, "Watchdog was already enabled\n"); | |
484 | } | |
485 | ||
486 | platform_set_drvdata(pdev, wdt_data); | |
4689ba97 GR |
487 | watchdog_stop_on_reboot(wdd); |
488 | watchdog_stop_on_unregister(wdd); | |
489 | ret = devm_watchdog_register_device(dev, wdd); | |
e51c288e KS |
490 | if (ret) |
491 | return ret; | |
492 | ||
493 | dev_info(dev, "Watchdog registered with %ds timeout\n", wdd->timeout); | |
494 | ||
495 | return 0; | |
496 | } | |
497 | ||
e51c288e KS |
498 | #ifdef CONFIG_PM |
499 | /* Disable watchdog if it is active during suspend */ | |
500 | static int kempld_wdt_suspend(struct platform_device *pdev, | |
501 | pm_message_t message) | |
502 | { | |
503 | struct kempld_wdt_data *wdt_data = platform_get_drvdata(pdev); | |
504 | struct kempld_device_data *pld = wdt_data->pld; | |
505 | struct watchdog_device *wdd = &wdt_data->wdd; | |
506 | ||
507 | kempld_get_mutex(pld); | |
508 | wdt_data->pm_status_store = kempld_read8(pld, KEMPLD_WDT_CFG); | |
509 | kempld_release_mutex(pld); | |
510 | ||
511 | kempld_wdt_update_timeouts(wdt_data); | |
512 | ||
513 | if (wdt_data->pm_status_store & KEMPLD_WDT_CFG_ENABLE) | |
514 | return kempld_wdt_stop(wdd); | |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
519 | /* Enable watchdog and configure it if necessary */ | |
520 | static int kempld_wdt_resume(struct platform_device *pdev) | |
521 | { | |
522 | struct kempld_wdt_data *wdt_data = platform_get_drvdata(pdev); | |
523 | struct watchdog_device *wdd = &wdt_data->wdd; | |
524 | ||
525 | /* | |
526 | * If watchdog was stopped before suspend be sure it gets disabled | |
527 | * again, for the case BIOS has enabled it during resume | |
528 | */ | |
529 | if (wdt_data->pm_status_store & KEMPLD_WDT_CFG_ENABLE) | |
530 | return kempld_wdt_start(wdd); | |
531 | else | |
532 | return kempld_wdt_stop(wdd); | |
533 | } | |
534 | #else | |
535 | #define kempld_wdt_suspend NULL | |
536 | #define kempld_wdt_resume NULL | |
537 | #endif | |
538 | ||
539 | static struct platform_driver kempld_wdt_driver = { | |
540 | .driver = { | |
541 | .name = "kempld-wdt", | |
e51c288e KS |
542 | }, |
543 | .probe = kempld_wdt_probe, | |
e51c288e KS |
544 | .suspend = kempld_wdt_suspend, |
545 | .resume = kempld_wdt_resume, | |
546 | }; | |
547 | ||
548 | module_platform_driver(kempld_wdt_driver); | |
549 | ||
550 | MODULE_DESCRIPTION("KEM PLD Watchdog Driver"); | |
551 | MODULE_AUTHOR("Michael Brunner <michael.brunner@kontron.com>"); | |
552 | MODULE_LICENSE("GPL"); |