]> Pileus Git - ~andy/linux/blob - drivers/watchdog/w83627hf_wdt.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc
[~andy/linux] / drivers / watchdog / w83627hf_wdt.c
1 /*
2  *      w83627hf/thf WDT driver
3  *
4  *      (c) Copyright 2013 Guenter Roeck
5  *              converted to watchdog infrastructure
6  *
7  *      (c) Copyright 2007 Vlad Drukker <vlad@storewiz.com>
8  *              added support for W83627THF.
9  *
10  *      (c) Copyright 2003,2007 Pádraig Brady <P@draigBrady.com>
11  *
12  *      Based on advantechwdt.c which is based on wdt.c.
13  *      Original copyright messages:
14  *
15  *      (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
16  *
17  *      (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
18  *                                              All Rights Reserved.
19  *
20  *      This program is free software; you can redistribute it and/or
21  *      modify it under the terms of the GNU General Public License
22  *      as published by the Free Software Foundation; either version
23  *      2 of the License, or (at your option) any later version.
24  *
25  *      Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
26  *      warranty for any of this software. This material is provided
27  *      "AS-IS" and at no charge.
28  *
29  *      (c) Copyright 1995    Alan Cox <alan@lxorguk.ukuu.org.uk>
30  */
31
32 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
33
34 #include <linux/module.h>
35 #include <linux/moduleparam.h>
36 #include <linux/types.h>
37 #include <linux/watchdog.h>
38 #include <linux/ioport.h>
39 #include <linux/notifier.h>
40 #include <linux/reboot.h>
41 #include <linux/init.h>
42 #include <linux/io.h>
43
44 #define WATCHDOG_NAME "w83627hf/thf/hg/dhg WDT"
45 #define WATCHDOG_TIMEOUT 60             /* 60 sec default timeout */
46
47 static int wdt_io;
48 static int cr_wdt_timeout;      /* WDT timeout register */
49 static int cr_wdt_control;      /* WDT control register */
50
51 enum chips { w83627hf, w83627s, w83697hf, w83697ug, w83637hf, w83627thf,
52              w83687thf, w83627ehf, w83627dhg, w83627uhg, w83667hg, w83627dhg_p,
53              w83667hg_b, nct6775, nct6776, nct6779 };
54
55 static int timeout;                     /* in seconds */
56 module_param(timeout, int, 0);
57 MODULE_PARM_DESC(timeout,
58                 "Watchdog timeout in seconds. 1 <= timeout <= 255, default="
59                                 __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
60
61 static bool nowayout = WATCHDOG_NOWAYOUT;
62 module_param(nowayout, bool, 0);
63 MODULE_PARM_DESC(nowayout,
64                 "Watchdog cannot be stopped once started (default="
65                                 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
66
67 /*
68  *      Kernel methods.
69  */
70
71 #define WDT_EFER (wdt_io+0)   /* Extended Function Enable Registers */
72 #define WDT_EFIR (wdt_io+0)   /* Extended Function Index Register
73                                                         (same as EFER) */
74 #define WDT_EFDR (WDT_EFIR+1) /* Extended Function Data Register */
75
76 #define W83627HF_LD_WDT         0x08
77
78 #define W83627HF_ID             0x52
79 #define W83627S_ID              0x59
80 #define W83697HF_ID             0x60
81 #define W83697UG_ID             0x68
82 #define W83637HF_ID             0x70
83 #define W83627THF_ID            0x82
84 #define W83687THF_ID            0x85
85 #define W83627EHF_ID            0x88
86 #define W83627DHG_ID            0xa0
87 #define W83627UHG_ID            0xa2
88 #define W83667HG_ID             0xa5
89 #define W83627DHG_P_ID          0xb0
90 #define W83667HG_B_ID           0xb3
91 #define NCT6775_ID              0xb4
92 #define NCT6776_ID              0xc3
93 #define NCT6779_ID              0xc5
94
95 #define W83627HF_WDT_TIMEOUT    0xf6
96 #define W83697HF_WDT_TIMEOUT    0xf4
97
98 #define W83627HF_WDT_CONTROL    0xf5
99 #define W83697HF_WDT_CONTROL    0xf3
100
101 static void superio_outb(int reg, int val)
102 {
103         outb(reg, WDT_EFER);
104         outb(val, WDT_EFDR);
105 }
106
107 static inline int superio_inb(int reg)
108 {
109         outb(reg, WDT_EFER);
110         return inb(WDT_EFDR);
111 }
112
113 static int superio_enter(void)
114 {
115         if (!request_muxed_region(wdt_io, 2, WATCHDOG_NAME))
116                 return -EBUSY;
117
118         outb_p(0x87, WDT_EFER); /* Enter extended function mode */
119         outb_p(0x87, WDT_EFER); /* Again according to manual */
120
121         return 0;
122 }
123
124 static void superio_select(int ld)
125 {
126         superio_outb(0x07, ld);
127 }
128
129 static void superio_exit(void)
130 {
131         outb_p(0xAA, WDT_EFER); /* Leave extended function mode */
132         release_region(wdt_io, 2);
133 }
134
135 static int w83627hf_init(struct watchdog_device *wdog, enum chips chip)
136 {
137         int ret;
138         unsigned char t;
139
140         ret = superio_enter();
141         if (ret)
142                 return ret;
143
144         superio_select(W83627HF_LD_WDT);
145
146         /* set CR30 bit 0 to activate GPIO2 */
147         t = superio_inb(0x30);
148         if (!(t & 0x01))
149                 superio_outb(0x30, t | 0x01);
150
151         switch (chip) {
152         case w83627hf:
153         case w83627s:
154                 t = superio_inb(0x2B) & ~0x10;
155                 superio_outb(0x2B, t); /* set GPIO24 to WDT0 */
156                 break;
157         case w83697hf:
158                 /* Set pin 119 to WDTO# mode (= CR29, WDT0) */
159                 t = superio_inb(0x29) & ~0x60;
160                 t |= 0x20;
161                 superio_outb(0x29, t);
162                 break;
163         case w83697ug:
164                 /* Set pin 118 to WDTO# mode */
165                 t = superio_inb(0x2b) & ~0x04;
166                 superio_outb(0x2b, t);
167                 break;
168         case w83627thf:
169                 t = (superio_inb(0x2B) & ~0x08) | 0x04;
170                 superio_outb(0x2B, t); /* set GPIO3 to WDT0 */
171                 break;
172         case w83627dhg:
173         case w83627dhg_p:
174                 t = superio_inb(0x2D) & ~0x01; /* PIN77 -> WDT0# */
175                 superio_outb(0x2D, t); /* set GPIO5 to WDT0 */
176                 t = superio_inb(cr_wdt_control);
177                 t |= 0x02;      /* enable the WDTO# output low pulse
178                                  * to the KBRST# pin */
179                 superio_outb(cr_wdt_control, t);
180                 break;
181         case w83637hf:
182                 break;
183         case w83687thf:
184                 t = superio_inb(0x2C) & ~0x80; /* PIN47 -> WDT0# */
185                 superio_outb(0x2C, t);
186                 break;
187         case w83627ehf:
188         case w83627uhg:
189         case w83667hg:
190         case w83667hg_b:
191         case nct6775:
192         case nct6776:
193         case nct6779:
194                 /*
195                  * These chips have a fixed WDTO# output pin (W83627UHG),
196                  * or support more than one WDTO# output pin.
197                  * Don't touch its configuration, and hope the BIOS
198                  * does the right thing.
199                  */
200                 t = superio_inb(cr_wdt_control);
201                 t |= 0x02;      /* enable the WDTO# output low pulse
202                                  * to the KBRST# pin */
203                 superio_outb(cr_wdt_control, t);
204                 break;
205         default:
206                 break;
207         }
208
209         t = superio_inb(cr_wdt_timeout);
210         if (t != 0) {
211                 pr_info("Watchdog already running. Resetting timeout to %d sec\n",
212                         wdog->timeout);
213                 superio_outb(cr_wdt_timeout, wdog->timeout);
214         }
215
216         /* set second mode & disable keyboard turning off watchdog */
217         t = superio_inb(cr_wdt_control) & ~0x0C;
218         superio_outb(cr_wdt_control, t);
219
220         /* reset trigger, disable keyboard & mouse turning off watchdog */
221         t = superio_inb(0xF7) & ~0xD0;
222         superio_outb(0xF7, t);
223
224         superio_exit();
225
226         return 0;
227 }
228
229 static int wdt_set_time(unsigned int timeout)
230 {
231         int ret;
232
233         ret = superio_enter();
234         if (ret)
235                 return ret;
236
237         superio_select(W83627HF_LD_WDT);
238         superio_outb(cr_wdt_timeout, timeout);
239         superio_exit();
240
241         return 0;
242 }
243
244 static int wdt_start(struct watchdog_device *wdog)
245 {
246         return wdt_set_time(wdog->timeout);
247 }
248
249 static int wdt_stop(struct watchdog_device *wdog)
250 {
251         return wdt_set_time(0);
252 }
253
254 static int wdt_set_timeout(struct watchdog_device *wdog, unsigned int timeout)
255 {
256         wdog->timeout = timeout;
257
258         return 0;
259 }
260
261 static unsigned int wdt_get_time(struct watchdog_device *wdog)
262 {
263         unsigned int timeleft;
264         int ret;
265
266         ret = superio_enter();
267         if (ret)
268                 return 0;
269
270         superio_select(W83627HF_LD_WDT);
271         timeleft = superio_inb(cr_wdt_timeout);
272         superio_exit();
273
274         return timeleft;
275 }
276
277 /*
278  *      Notifier for system down
279  */
280 static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
281         void *unused)
282 {
283         if (code == SYS_DOWN || code == SYS_HALT)
284                 wdt_set_time(0);        /* Turn the WDT off */
285
286         return NOTIFY_DONE;
287 }
288
289 /*
290  *      Kernel Interfaces
291  */
292
293 static struct watchdog_info wdt_info = {
294         .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
295         .identity = "W83627HF Watchdog",
296 };
297
298 static struct watchdog_ops wdt_ops = {
299         .owner = THIS_MODULE,
300         .start = wdt_start,
301         .stop = wdt_stop,
302         .set_timeout = wdt_set_timeout,
303         .get_timeleft = wdt_get_time,
304 };
305
306 static struct watchdog_device wdt_dev = {
307         .info = &wdt_info,
308         .ops = &wdt_ops,
309         .timeout = WATCHDOG_TIMEOUT,
310         .min_timeout = 1,
311         .max_timeout = 255,
312 };
313
314 /*
315  *      The WDT needs to learn about soft shutdowns in order to
316  *      turn the timebomb registers off.
317  */
318
319 static struct notifier_block wdt_notifier = {
320         .notifier_call = wdt_notify_sys,
321 };
322
323 static int wdt_find(int addr)
324 {
325         u8 val;
326         int ret;
327
328         cr_wdt_timeout = W83627HF_WDT_TIMEOUT;
329         cr_wdt_control = W83627HF_WDT_CONTROL;
330
331         ret = superio_enter();
332         if (ret)
333                 return ret;
334         superio_select(W83627HF_LD_WDT);
335         val = superio_inb(0x20);
336         switch (val) {
337         case W83627HF_ID:
338                 ret = w83627hf;
339                 break;
340         case W83627S_ID:
341                 ret = w83627s;
342                 break;
343         case W83697HF_ID:
344                 ret = w83697hf;
345                 cr_wdt_timeout = W83697HF_WDT_TIMEOUT;
346                 cr_wdt_control = W83697HF_WDT_CONTROL;
347                 break;
348         case W83697UG_ID:
349                 ret = w83697ug;
350                 cr_wdt_timeout = W83697HF_WDT_TIMEOUT;
351                 cr_wdt_control = W83697HF_WDT_CONTROL;
352                 break;
353         case W83637HF_ID:
354                 ret = w83637hf;
355                 break;
356         case W83627THF_ID:
357                 ret = w83627thf;
358                 break;
359         case W83687THF_ID:
360                 ret = w83687thf;
361                 break;
362         case W83627EHF_ID:
363                 ret = w83627ehf;
364                 break;
365         case W83627DHG_ID:
366                 ret = w83627dhg;
367                 break;
368         case W83627DHG_P_ID:
369                 ret = w83627dhg_p;
370                 break;
371         case W83627UHG_ID:
372                 ret = w83627uhg;
373                 break;
374         case W83667HG_ID:
375                 ret = w83667hg;
376                 break;
377         case W83667HG_B_ID:
378                 ret = w83667hg_b;
379                 break;
380         case NCT6775_ID:
381                 ret = nct6775;
382                 break;
383         case NCT6776_ID:
384                 ret = nct6776;
385                 break;
386         case NCT6779_ID:
387                 ret = nct6779;
388                 break;
389         case 0xff:
390                 ret = -ENODEV;
391                 break;
392         default:
393                 ret = -ENODEV;
394                 pr_err("Unsupported chip ID: 0x%02x\n", val);
395                 break;
396         }
397         superio_exit();
398         return ret;
399 }
400
401 static int __init wdt_init(void)
402 {
403         int ret;
404         int chip;
405         const char * const chip_name[] = {
406                 "W83627HF",
407                 "W83627S",
408                 "W83697HF",
409                 "W83697UG",
410                 "W83637HF",
411                 "W83627THF",
412                 "W83687THF",
413                 "W83627EHF",
414                 "W83627DHG",
415                 "W83627UHG",
416                 "W83667HG",
417                 "W83667DHG-P",
418                 "W83667HG-B",
419                 "NCT6775",
420                 "NCT6776",
421                 "NCT6779",
422         };
423
424         wdt_io = 0x2e;
425         chip = wdt_find(0x2e);
426         if (chip < 0) {
427                 wdt_io = 0x4e;
428                 chip = wdt_find(0x4e);
429                 if (chip < 0)
430                         return chip;
431         }
432
433         pr_info("WDT driver for %s Super I/O chip initialising\n",
434                 chip_name[chip]);
435
436         watchdog_init_timeout(&wdt_dev, timeout, NULL);
437         watchdog_set_nowayout(&wdt_dev, nowayout);
438
439         ret = w83627hf_init(&wdt_dev, chip);
440         if (ret) {
441                 pr_err("failed to initialize watchdog (err=%d)\n", ret);
442                 return ret;
443         }
444
445         ret = register_reboot_notifier(&wdt_notifier);
446         if (ret != 0) {
447                 pr_err("cannot register reboot notifier (err=%d)\n", ret);
448                 return ret;
449         }
450
451         ret = watchdog_register_device(&wdt_dev);
452         if (ret)
453                 goto unreg_reboot;
454
455         pr_info("initialized. timeout=%d sec (nowayout=%d)\n",
456                 wdt_dev.timeout, nowayout);
457
458         return ret;
459
460 unreg_reboot:
461         unregister_reboot_notifier(&wdt_notifier);
462         return ret;
463 }
464
465 static void __exit wdt_exit(void)
466 {
467         watchdog_unregister_device(&wdt_dev);
468         unregister_reboot_notifier(&wdt_notifier);
469 }
470
471 module_init(wdt_init);
472 module_exit(wdt_exit);
473
474 MODULE_LICENSE("GPL");
475 MODULE_AUTHOR("Pádraig  Brady <P@draigBrady.com>");
476 MODULE_DESCRIPTION("w83627hf/thf WDT driver");