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IB/uverbs: Fix reference counting usage of event files
[linux/fpc-iii.git] / drivers / watchdog / iTCO_wdt.c
blob3c3fd417ddeb135db14f50a9de9a5d8411bab8e8
1 /*
2 * intel TCO Watchdog Driver
3 *
4 * (c) Copyright 2006-2011 Wim Van Sebroeck <wim@iguana.be>.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
12 * provide warranty for any of this software. This material is
13 * provided "AS-IS" and at no charge.
14 *
15 * The TCO watchdog is implemented in the following I/O controller hubs:
16 * (See the intel documentation on http://developer.intel.com.)
17 * document number 290655-003, 290677-014: 82801AA (ICH), 82801AB (ICHO)
18 * document number 290687-002, 298242-027: 82801BA (ICH2)
19 * document number 290733-003, 290739-013: 82801CA (ICH3-S)
20 * document number 290716-001, 290718-007: 82801CAM (ICH3-M)
21 * document number 290744-001, 290745-025: 82801DB (ICH4)
22 * document number 252337-001, 252663-008: 82801DBM (ICH4-M)
23 * document number 273599-001, 273645-002: 82801E (C-ICH)
24 * document number 252516-001, 252517-028: 82801EB (ICH5), 82801ER (ICH5R)
25 * document number 300641-004, 300884-013: 6300ESB
26 * document number 301473-002, 301474-026: 82801F (ICH6)
27 * document number 313082-001, 313075-006: 631xESB, 632xESB
28 * document number 307013-003, 307014-024: 82801G (ICH7)
29 * document number 322896-001, 322897-001: NM10
30 * document number 313056-003, 313057-017: 82801H (ICH8)
31 * document number 316972-004, 316973-012: 82801I (ICH9)
32 * document number 319973-002, 319974-002: 82801J (ICH10)
33 * document number 322169-001, 322170-003: 5 Series, 3400 Series (PCH)
34 * document number 320066-003, 320257-008: EP80597 (IICH)
35 * document number 324645-001, 324646-001: Cougar Point (CPT)
36 * document number TBD : Patsburg (PBG)
37 * document number TBD : DH89xxCC
38 * document number TBD : Panther Point
39 * document number TBD : Lynx Point
40 * document number TBD : Lynx Point-LP
41 */
42
43 /*
44 * Includes, defines, variables, module parameters, ...
45 */
46
47 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
48
49 /* Module and version information */
50 #define DRV_NAME "iTCO_wdt"
51 #define DRV_VERSION "1.11"
52
53 /* Includes */
54 #include <linux/acpi.h> /* For ACPI support */
55 #include <linux/module.h> /* For module specific items */
56 #include <linux/moduleparam.h> /* For new moduleparam's */
57 #include <linux/types.h> /* For standard types (like size_t) */
58 #include <linux/errno.h> /* For the -ENODEV/... values */
59 #include <linux/kernel.h> /* For printk/panic/... */
60 #include <linux/watchdog.h> /* For the watchdog specific items */
61 #include <linux/init.h> /* For __init/__exit/... */
62 #include <linux/fs.h> /* For file operations */
63 #include <linux/platform_device.h> /* For platform_driver framework */
64 #include <linux/pci.h> /* For pci functions */
65 #include <linux/ioport.h> /* For io-port access */
66 #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
67 #include <linux/uaccess.h> /* For copy_to_user/put_user/... */
68 #include <linux/io.h> /* For inb/outb/... */
69 #include <linux/mfd/core.h>
70 #include <linux/mfd/lpc_ich.h>
71
72 #include "iTCO_vendor.h"
73
74 /* Address definitions for the TCO */
75 /* TCO base address */
76 #define TCOBASE (iTCO_wdt_private.tco_res->start)
77 /* SMI Control and Enable Register */
78 #define SMI_EN (iTCO_wdt_private.smi_res->start)
79
80 #define TCO_RLD (TCOBASE + 0x00) /* TCO Timer Reload and Curr. Value */
81 #define TCOv1_TMR (TCOBASE + 0x01) /* TCOv1 Timer Initial Value */
82 #define TCO_DAT_IN (TCOBASE + 0x02) /* TCO Data In Register */
83 #define TCO_DAT_OUT (TCOBASE + 0x03) /* TCO Data Out Register */
84 #define TCO1_STS (TCOBASE + 0x04) /* TCO1 Status Register */
85 #define TCO2_STS (TCOBASE + 0x06) /* TCO2 Status Register */
86 #define TCO1_CNT (TCOBASE + 0x08) /* TCO1 Control Register */
87 #define TCO2_CNT (TCOBASE + 0x0a) /* TCO2 Control Register */
88 #define TCOv2_TMR (TCOBASE + 0x12) /* TCOv2 Timer Initial Value */
89
90 /* internal variables */
91 static struct { /* this is private data for the iTCO_wdt device */
92 /* TCO version/generation */
93 unsigned int iTCO_version;
94 struct resource *tco_res;
95 struct resource *smi_res;
96 /*
97 * NO_REBOOT flag is Memory-Mapped GCS register bit 5 (TCO version 2),
98 * or memory-mapped PMC register bit 4 (TCO version 3).
99 */
100 struct resource *gcs_pmc_res;
101 unsigned long __iomem *gcs_pmc;
102 /* the lock for io operations */
103 spinlock_t io_lock;
104 struct platform_device *dev;
105 /* the PCI-device */
106 struct pci_dev *pdev;
107 /* whether or not the watchdog has been suspended */
108 bool suspended;
109 } iTCO_wdt_private;
110
111 /* module parameters */
112 #define WATCHDOG_TIMEOUT 30 /* 30 sec default heartbeat */
113 static int heartbeat = WATCHDOG_TIMEOUT; /* in seconds */
114 module_param(heartbeat, int, 0);
115 MODULE_PARM_DESC(heartbeat, "Watchdog timeout in seconds. "
116 "5..76 (TCO v1) or 3..614 (TCO v2), default="
117 __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
118
119 static bool nowayout = WATCHDOG_NOWAYOUT;
120 module_param(nowayout, bool, 0);
121 MODULE_PARM_DESC(nowayout,
122 "Watchdog cannot be stopped once started (default="
123 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
124
125 static int turn_SMI_watchdog_clear_off = 1;
126 module_param(turn_SMI_watchdog_clear_off, int, 0);
127 MODULE_PARM_DESC(turn_SMI_watchdog_clear_off,
128 "Turn off SMI clearing watchdog (depends on TCO-version)(default=1)");
129
130 /*
131 * Some TCO specific functions
132 */
133
134 /*
135 * The iTCO v1 and v2's internal timer is stored as ticks which decrement
136 * every 0.6 seconds. v3's internal timer is stored as seconds (some
137 * datasheets incorrectly state 0.6 seconds).
138 */
139 static inline unsigned int seconds_to_ticks(int secs)
140 {
141 return iTCO_wdt_private.iTCO_version == 3 ? secs : (secs * 10) / 6;
142 }
143
144 static inline unsigned int ticks_to_seconds(int ticks)
145 {
146 return iTCO_wdt_private.iTCO_version == 3 ? ticks : (ticks * 6) / 10;
147 }
148
149 static void iTCO_wdt_set_NO_REBOOT_bit(void)
150 {
151 u32 val32;
152
153 /* Set the NO_REBOOT bit: this disables reboots */
154 if (iTCO_wdt_private.iTCO_version == 3) {
155 val32 = readl(iTCO_wdt_private.gcs_pmc);
156 val32 |= 0x00000010;
157 writel(val32, iTCO_wdt_private.gcs_pmc);
158 } else if (iTCO_wdt_private.iTCO_version == 2) {
159 val32 = readl(iTCO_wdt_private.gcs_pmc);
160 val32 |= 0x00000020;
161 writel(val32, iTCO_wdt_private.gcs_pmc);
162 } else if (iTCO_wdt_private.iTCO_version == 1) {
163 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
164 val32 |= 0x00000002;
165 pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
166 }
167 }
168
169 static int iTCO_wdt_unset_NO_REBOOT_bit(void)
170 {
171 int ret = 0;
172 u32 val32;
173
174 /* Unset the NO_REBOOT bit: this enables reboots */
175 if (iTCO_wdt_private.iTCO_version == 3) {
176 val32 = readl(iTCO_wdt_private.gcs_pmc);
177 val32 &= 0xffffffef;
178 writel(val32, iTCO_wdt_private.gcs_pmc);
179
180 val32 = readl(iTCO_wdt_private.gcs_pmc);
181 if (val32 & 0x00000010)
182 ret = -EIO;
183 } else if (iTCO_wdt_private.iTCO_version == 2) {
184 val32 = readl(iTCO_wdt_private.gcs_pmc);
185 val32 &= 0xffffffdf;
186 writel(val32, iTCO_wdt_private.gcs_pmc);
187
188 val32 = readl(iTCO_wdt_private.gcs_pmc);
189 if (val32 & 0x00000020)
190 ret = -EIO;
191 } else if (iTCO_wdt_private.iTCO_version == 1) {
192 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
193 val32 &= 0xfffffffd;
194 pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
195
196 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
197 if (val32 & 0x00000002)
198 ret = -EIO;
199 }
200
201 return ret; /* returns: 0 = OK, -EIO = Error */
202 }
203
204 static int iTCO_wdt_start(struct watchdog_device *wd_dev)
205 {
206 unsigned int val;
207
208 spin_lock(&iTCO_wdt_private.io_lock);
209
210 iTCO_vendor_pre_start(iTCO_wdt_private.smi_res, wd_dev->timeout);
211
212 /* disable chipset's NO_REBOOT bit */
213 if (iTCO_wdt_unset_NO_REBOOT_bit()) {
214 spin_unlock(&iTCO_wdt_private.io_lock);
215 pr_err("failed to reset NO_REBOOT flag, reboot disabled by hardware/BIOS\n");
216 return -EIO;
217 }
218
219 /* Force the timer to its reload value by writing to the TCO_RLD
220 register */
221 if (iTCO_wdt_private.iTCO_version >= 2)
222 outw(0x01, TCO_RLD);
223 else if (iTCO_wdt_private.iTCO_version == 1)
224 outb(0x01, TCO_RLD);
225
226 /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled to count */
227 val = inw(TCO1_CNT);
228 val &= 0xf7ff;
229 outw(val, TCO1_CNT);
230 val = inw(TCO1_CNT);
231 spin_unlock(&iTCO_wdt_private.io_lock);
232
233 if (val & 0x0800)
234 return -1;
235 return 0;
236 }
237
238 static int iTCO_wdt_stop(struct watchdog_device *wd_dev)
239 {
240 unsigned int val;
241
242 spin_lock(&iTCO_wdt_private.io_lock);
243
244 iTCO_vendor_pre_stop(iTCO_wdt_private.smi_res);
245
246 /* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */
247 val = inw(TCO1_CNT);
248 val |= 0x0800;
249 outw(val, TCO1_CNT);
250 val = inw(TCO1_CNT);
251
252 /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
253 iTCO_wdt_set_NO_REBOOT_bit();
254
255 spin_unlock(&iTCO_wdt_private.io_lock);
256
257 if ((val & 0x0800) == 0)
258 return -1;
259 return 0;
260 }
261
262 static int iTCO_wdt_ping(struct watchdog_device *wd_dev)
263 {
264 spin_lock(&iTCO_wdt_private.io_lock);
265
266 iTCO_vendor_pre_keepalive(iTCO_wdt_private.smi_res, wd_dev->timeout);
267
268 /* Reload the timer by writing to the TCO Timer Counter register */
269 if (iTCO_wdt_private.iTCO_version >= 2) {
270 outw(0x01, TCO_RLD);
271 } else if (iTCO_wdt_private.iTCO_version == 1) {
272 /* Reset the timeout status bit so that the timer
273 * needs to count down twice again before rebooting */
274 outw(0x0008, TCO1_STS); /* write 1 to clear bit */
275
276 outb(0x01, TCO_RLD);
277 }
278
279 spin_unlock(&iTCO_wdt_private.io_lock);
280 return 0;
281 }
282
283 static int iTCO_wdt_set_timeout(struct watchdog_device *wd_dev, unsigned int t)
284 {
285 unsigned int val16;
286 unsigned char val8;
287 unsigned int tmrval;
288
289 tmrval = seconds_to_ticks(t);
290
291 /* For TCO v1 the timer counts down twice before rebooting */
292 if (iTCO_wdt_private.iTCO_version == 1)
293 tmrval /= 2;
294
295 /* from the specs: */
296 /* "Values of 0h-3h are ignored and should not be attempted" */
297 if (tmrval < 0x04)
298 return -EINVAL;
299 if (((iTCO_wdt_private.iTCO_version >= 2) && (tmrval > 0x3ff)) ||
300 ((iTCO_wdt_private.iTCO_version == 1) && (tmrval > 0x03f)))
301 return -EINVAL;
302
303 iTCO_vendor_pre_set_heartbeat(tmrval);
304
305 /* Write new heartbeat to watchdog */
306 if (iTCO_wdt_private.iTCO_version >= 2) {
307 spin_lock(&iTCO_wdt_private.io_lock);
308 val16 = inw(TCOv2_TMR);
309 val16 &= 0xfc00;
310 val16 |= tmrval;
311 outw(val16, TCOv2_TMR);
312 val16 = inw(TCOv2_TMR);
313 spin_unlock(&iTCO_wdt_private.io_lock);
314
315 if ((val16 & 0x3ff) != tmrval)
316 return -EINVAL;
317 } else if (iTCO_wdt_private.iTCO_version == 1) {
318 spin_lock(&iTCO_wdt_private.io_lock);
319 val8 = inb(TCOv1_TMR);
320 val8 &= 0xc0;
321 val8 |= (tmrval & 0xff);
322 outb(val8, TCOv1_TMR);
323 val8 = inb(TCOv1_TMR);
324 spin_unlock(&iTCO_wdt_private.io_lock);
325
326 if ((val8 & 0x3f) != tmrval)
327 return -EINVAL;
328 }
329
330 wd_dev->timeout = t;
331 return 0;
332 }
333
334 static unsigned int iTCO_wdt_get_timeleft(struct watchdog_device *wd_dev)
335 {
336 unsigned int val16;
337 unsigned char val8;
338 unsigned int time_left = 0;
339
340 /* read the TCO Timer */
341 if (iTCO_wdt_private.iTCO_version >= 2) {
342 spin_lock(&iTCO_wdt_private.io_lock);
343 val16 = inw(TCO_RLD);
344 val16 &= 0x3ff;
345 spin_unlock(&iTCO_wdt_private.io_lock);
346
347 time_left = ticks_to_seconds(val16);
348 } else if (iTCO_wdt_private.iTCO_version == 1) {
349 spin_lock(&iTCO_wdt_private.io_lock);
350 val8 = inb(TCO_RLD);
351 val8 &= 0x3f;
352 if (!(inw(TCO1_STS) & 0x0008))
353 val8 += (inb(TCOv1_TMR) & 0x3f);
354 spin_unlock(&iTCO_wdt_private.io_lock);
355
356 time_left = ticks_to_seconds(val8);
357 }
358 return time_left;
359 }
360
361 /*
362 * Kernel Interfaces
363 */
364
365 static const struct watchdog_info ident = {
366 .options = WDIOF_SETTIMEOUT |
367 WDIOF_KEEPALIVEPING |
368 WDIOF_MAGICCLOSE,
369 .firmware_version = 0,
370 .identity = DRV_NAME,
371 };
372
373 static const struct watchdog_ops iTCO_wdt_ops = {
374 .owner = THIS_MODULE,
375 .start = iTCO_wdt_start,
376 .stop = iTCO_wdt_stop,
377 .ping = iTCO_wdt_ping,
378 .set_timeout = iTCO_wdt_set_timeout,
379 .get_timeleft = iTCO_wdt_get_timeleft,
380 };
381
382 static struct watchdog_device iTCO_wdt_watchdog_dev = {
383 .info = &ident,
384 .ops = &iTCO_wdt_ops,
385 };
386
387 /*
388 * Init & exit routines
389 */
390
391 static void iTCO_wdt_cleanup(void)
392 {
393 /* Stop the timer before we leave */
394 if (!nowayout)
395 iTCO_wdt_stop(&iTCO_wdt_watchdog_dev);
396
397 /* Deregister */
398 watchdog_unregister_device(&iTCO_wdt_watchdog_dev);
399
400 /* release resources */
401 release_region(iTCO_wdt_private.tco_res->start,
402 resource_size(iTCO_wdt_private.tco_res));
403 release_region(iTCO_wdt_private.smi_res->start,
404 resource_size(iTCO_wdt_private.smi_res));
405 if (iTCO_wdt_private.iTCO_version >= 2) {
406 iounmap(iTCO_wdt_private.gcs_pmc);
407 release_mem_region(iTCO_wdt_private.gcs_pmc_res->start,
408 resource_size(iTCO_wdt_private.gcs_pmc_res));
409 }
410
411 iTCO_wdt_private.tco_res = NULL;
412 iTCO_wdt_private.smi_res = NULL;
413 iTCO_wdt_private.gcs_pmc_res = NULL;
414 iTCO_wdt_private.gcs_pmc = NULL;
415 }
416
417 static int iTCO_wdt_probe(struct platform_device *dev)
418 {
419 int ret = -ENODEV;
420 unsigned long val32;
421 struct lpc_ich_info *ich_info = dev_get_platdata(&dev->dev);
422
423 if (!ich_info)
424 goto out;
425
426 spin_lock_init(&iTCO_wdt_private.io_lock);
427
428 iTCO_wdt_private.tco_res =
429 platform_get_resource(dev, IORESOURCE_IO, ICH_RES_IO_TCO);
430 if (!iTCO_wdt_private.tco_res)
431 goto out;
432
433 iTCO_wdt_private.smi_res =
434 platform_get_resource(dev, IORESOURCE_IO, ICH_RES_IO_SMI);
435 if (!iTCO_wdt_private.smi_res)
436 goto out;
437
438 iTCO_wdt_private.iTCO_version = ich_info->iTCO_version;
439 iTCO_wdt_private.dev = dev;
440 iTCO_wdt_private.pdev = to_pci_dev(dev->dev.parent);
441
442 /*
443 * Get the Memory-Mapped GCS or PMC register, we need it for the
444 * NO_REBOOT flag (TCO v2 and v3).
445 */
446 if (iTCO_wdt_private.iTCO_version >= 2) {
447 iTCO_wdt_private.gcs_pmc_res = platform_get_resource(dev,
448 IORESOURCE_MEM,
449 ICH_RES_MEM_GCS_PMC);
450
451 if (!iTCO_wdt_private.gcs_pmc_res)
452 goto out;
453
454 if (!request_mem_region(iTCO_wdt_private.gcs_pmc_res->start,
455 resource_size(iTCO_wdt_private.gcs_pmc_res), dev->name)) {
456 ret = -EBUSY;
457 goto out;
458 }
459 iTCO_wdt_private.gcs_pmc = ioremap(iTCO_wdt_private.gcs_pmc_res->start,
460 resource_size(iTCO_wdt_private.gcs_pmc_res));
461 if (!iTCO_wdt_private.gcs_pmc) {
462 ret = -EIO;
463 goto unreg_gcs_pmc;
464 }
465 }
466
467 /* Check chipset's NO_REBOOT bit */
468 if (iTCO_wdt_unset_NO_REBOOT_bit() && iTCO_vendor_check_noreboot_on()) {
469 pr_info("unable to reset NO_REBOOT flag, device disabled by hardware/BIOS\n");
470 ret = -ENODEV; /* Cannot reset NO_REBOOT bit */
471 goto unmap_gcs_pmc;
472 }
473
474 /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
475 iTCO_wdt_set_NO_REBOOT_bit();
476
477 /* The TCO logic uses the TCO_EN bit in the SMI_EN register */
478 if (!request_region(iTCO_wdt_private.smi_res->start,
479 resource_size(iTCO_wdt_private.smi_res), dev->name)) {
480 pr_err("I/O address 0x%04llx already in use, device disabled\n",
481 (u64)SMI_EN);
482 ret = -EBUSY;
483 goto unmap_gcs_pmc;
484 }
485 if (turn_SMI_watchdog_clear_off >= iTCO_wdt_private.iTCO_version) {
486 /*
487 * Bit 13: TCO_EN -> 0
488 * Disables TCO logic generating an SMI#
489 */
490 val32 = inl(SMI_EN);
491 val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */
492 outl(val32, SMI_EN);
493 }
494
495 if (!request_region(iTCO_wdt_private.tco_res->start,
496 resource_size(iTCO_wdt_private.tco_res), dev->name)) {
497 pr_err("I/O address 0x%04llx already in use, device disabled\n",
498 (u64)TCOBASE);
499 ret = -EBUSY;
500 goto unreg_smi;
501 }
502
503 pr_info("Found a %s TCO device (Version=%d, TCOBASE=0x%04llx)\n",
504 ich_info->name, ich_info->iTCO_version, (u64)TCOBASE);
505
506 /* Clear out the (probably old) status */
507 if (iTCO_wdt_private.iTCO_version == 3) {
508 outl(0x20008, TCO1_STS);
509 } else {
510 outw(0x0008, TCO1_STS); /* Clear the Time Out Status bit */
511 outw(0x0002, TCO2_STS); /* Clear SECOND_TO_STS bit */
512 outw(0x0004, TCO2_STS); /* Clear BOOT_STS bit */
513 }
514
515 iTCO_wdt_watchdog_dev.bootstatus = 0;
516 iTCO_wdt_watchdog_dev.timeout = WATCHDOG_TIMEOUT;
517 watchdog_set_nowayout(&iTCO_wdt_watchdog_dev, nowayout);
518 iTCO_wdt_watchdog_dev.parent = &dev->dev;
519
520 /* Make sure the watchdog is not running */
521 iTCO_wdt_stop(&iTCO_wdt_watchdog_dev);
522
523 /* Check that the heartbeat value is within it's range;
524 if not reset to the default */
525 if (iTCO_wdt_set_timeout(&iTCO_wdt_watchdog_dev, heartbeat)) {
526 iTCO_wdt_set_timeout(&iTCO_wdt_watchdog_dev, WATCHDOG_TIMEOUT);
527 pr_info("timeout value out of range, using %d\n",
528 WATCHDOG_TIMEOUT);
529 }
530
531 ret = watchdog_register_device(&iTCO_wdt_watchdog_dev);
532 if (ret != 0) {
533 pr_err("cannot register watchdog device (err=%d)\n", ret);
534 goto unreg_tco;
535 }
536
537 pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
538 heartbeat, nowayout);
539
540 return 0;
541
542 unreg_tco:
543 release_region(iTCO_wdt_private.tco_res->start,
544 resource_size(iTCO_wdt_private.tco_res));
545 unreg_smi:
546 release_region(iTCO_wdt_private.smi_res->start,
547 resource_size(iTCO_wdt_private.smi_res));
548 unmap_gcs_pmc:
549 if (iTCO_wdt_private.iTCO_version >= 2)
550 iounmap(iTCO_wdt_private.gcs_pmc);
551 unreg_gcs_pmc:
552 if (iTCO_wdt_private.iTCO_version >= 2)
553 release_mem_region(iTCO_wdt_private.gcs_pmc_res->start,
554 resource_size(iTCO_wdt_private.gcs_pmc_res));
555 out:
556 iTCO_wdt_private.tco_res = NULL;
557 iTCO_wdt_private.smi_res = NULL;
558 iTCO_wdt_private.gcs_pmc_res = NULL;
559 iTCO_wdt_private.gcs_pmc = NULL;
560
561 return ret;
562 }
563
564 static int iTCO_wdt_remove(struct platform_device *dev)
565 {
566 if (iTCO_wdt_private.tco_res || iTCO_wdt_private.smi_res)
567 iTCO_wdt_cleanup();
568
569 return 0;
570 }
571
572 static void iTCO_wdt_shutdown(struct platform_device *dev)
573 {
574 iTCO_wdt_stop(NULL);
575 }
576
577 #ifdef CONFIG_PM_SLEEP
578 /*
579 * Suspend-to-idle requires this, because it stops the ticks and timekeeping, so
580 * the watchdog cannot be pinged while in that state. In ACPI sleep states the
581 * watchdog is stopped by the platform firmware.
582 */
583
584 #ifdef CONFIG_ACPI
585 static inline bool need_suspend(void)
586 {
587 return acpi_target_system_state() == ACPI_STATE_S0;
588 }
589 #else
590 static inline bool need_suspend(void) { return true; }
591 #endif
592
593 static int iTCO_wdt_suspend_noirq(struct device *dev)
594 {
595 int ret = 0;
596
597 iTCO_wdt_private.suspended = false;
598 if (watchdog_active(&iTCO_wdt_watchdog_dev) && need_suspend()) {
599 ret = iTCO_wdt_stop(&iTCO_wdt_watchdog_dev);
600 if (!ret)
601 iTCO_wdt_private.suspended = true;
602 }
603 return ret;
604 }
605
606 static int iTCO_wdt_resume_noirq(struct device *dev)
607 {
608 if (iTCO_wdt_private.suspended)
609 iTCO_wdt_start(&iTCO_wdt_watchdog_dev);
610
611 return 0;
612 }
613
614 static struct dev_pm_ops iTCO_wdt_pm = {
615 .suspend_noirq = iTCO_wdt_suspend_noirq,
616 .resume_noirq = iTCO_wdt_resume_noirq,
617 };
618
619 #define ITCO_WDT_PM_OPS (&iTCO_wdt_pm)
620 #else
621 #define ITCO_WDT_PM_OPS NULL
622 #endif /* CONFIG_PM_SLEEP */
623
624 static struct platform_driver iTCO_wdt_driver = {
625 .probe = iTCO_wdt_probe,
626 .remove = iTCO_wdt_remove,
627 .shutdown = iTCO_wdt_shutdown,
628 .driver = {
629 .name = DRV_NAME,
630 .pm = ITCO_WDT_PM_OPS,
631 },
632 };
633
634 static int __init iTCO_wdt_init_module(void)
635 {
636 int err;
637
638 pr_info("Intel TCO WatchDog Timer Driver v%s\n", DRV_VERSION);
639
640 err = platform_driver_register(&iTCO_wdt_driver);
641 if (err)
642 return err;
643
644 return 0;
645 }
646
647 static void __exit iTCO_wdt_cleanup_module(void)
648 {
649 platform_driver_unregister(&iTCO_wdt_driver);
650 pr_info("Watchdog Module Unloaded\n");
651 }
652
653 module_init(iTCO_wdt_init_module);
654 module_exit(iTCO_wdt_cleanup_module);
655
656 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
657 MODULE_DESCRIPTION("Intel TCO WatchDog Timer Driver");
658 MODULE_VERSION(DRV_VERSION);
659 MODULE_LICENSE("GPL");
660 MODULE_ALIAS("platform:" DRV_NAME);
Linux with added FPC-III support