This source file includes following definitions.
- seconds_to_ticks
- ticks_to_seconds
- no_reboot_bit
- update_no_reboot_bit_def
- update_no_reboot_bit_pci
- update_no_reboot_bit_mem
- update_no_reboot_bit_cnt
- iTCO_wdt_no_reboot_bit_setup
- iTCO_wdt_start
- iTCO_wdt_stop
- iTCO_wdt_ping
- iTCO_wdt_set_timeout
- iTCO_wdt_get_timeleft
- iTCO_wdt_probe
- need_suspend
- need_suspend
- iTCO_wdt_suspend_noirq
- iTCO_wdt_resume_noirq
- iTCO_wdt_init_module
- iTCO_wdt_cleanup_module
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42
43 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
44
45
46 #define DRV_NAME "iTCO_wdt"
47 #define DRV_VERSION "1.11"
48
49
50 #include <linux/acpi.h>
51 #include <linux/bits.h>
52 #include <linux/module.h>
53 #include <linux/moduleparam.h>
54 #include <linux/types.h>
55 #include <linux/errno.h>
56 #include <linux/kernel.h>
57 #include <linux/watchdog.h>
58 #include <linux/init.h>
59 #include <linux/fs.h>
60 #include <linux/platform_device.h>
61 #include <linux/pci.h>
62 #include <linux/ioport.h>
63 #include <linux/spinlock.h>
64 #include <linux/uaccess.h>
65 #include <linux/io.h>
66 #include <linux/platform_data/itco_wdt.h>
67
68 #include "iTCO_vendor.h"
69
70
71
72 #define TCOBASE(p) ((p)->tco_res->start)
73
74 #define SMI_EN(p) ((p)->smi_res->start)
75
76 #define TCO_RLD(p) (TCOBASE(p) + 0x00)
77 #define TCOv1_TMR(p) (TCOBASE(p) + 0x01)
78 #define TCO_DAT_IN(p) (TCOBASE(p) + 0x02)
79 #define TCO_DAT_OUT(p) (TCOBASE(p) + 0x03)
80 #define TCO1_STS(p) (TCOBASE(p) + 0x04)
81 #define TCO2_STS(p) (TCOBASE(p) + 0x06)
82 #define TCO1_CNT(p) (TCOBASE(p) + 0x08)
83 #define TCO2_CNT(p) (TCOBASE(p) + 0x0a)
84 #define TCOv2_TMR(p) (TCOBASE(p) + 0x12)
85
86
87 struct iTCO_wdt_private {
88 struct watchdog_device wddev;
89
90
91 unsigned int iTCO_version;
92 struct resource *tco_res;
93 struct resource *smi_res;
94
95
96
97
98 struct resource *gcs_pmc_res;
99 unsigned long __iomem *gcs_pmc;
100
101 spinlock_t io_lock;
102
103 struct pci_dev *pci_dev;
104
105 bool suspended;
106
107 void *no_reboot_priv;
108
109 int (*update_no_reboot_bit)(void *p, bool set);
110 };
111
112
113 #define WATCHDOG_TIMEOUT 30
114 static int heartbeat = WATCHDOG_TIMEOUT;
115 module_param(heartbeat, int, 0);
116 MODULE_PARM_DESC(heartbeat, "Watchdog timeout in seconds. "
117 "5..76 (TCO v1) or 3..614 (TCO v2), default="
118 __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
119
120 static bool nowayout = WATCHDOG_NOWAYOUT;
121 module_param(nowayout, bool, 0);
122 MODULE_PARM_DESC(nowayout,
123 "Watchdog cannot be stopped once started (default="
124 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
125
126 static int turn_SMI_watchdog_clear_off = 1;
127 module_param(turn_SMI_watchdog_clear_off, int, 0);
128 MODULE_PARM_DESC(turn_SMI_watchdog_clear_off,
129 "Turn off SMI clearing watchdog (depends on TCO-version)(default=1)");
130
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139
140 static inline unsigned int seconds_to_ticks(struct iTCO_wdt_private *p,
141 int secs)
142 {
143 return p->iTCO_version == 3 ? secs : (secs * 10) / 6;
144 }
145
146 static inline unsigned int ticks_to_seconds(struct iTCO_wdt_private *p,
147 int ticks)
148 {
149 return p->iTCO_version == 3 ? ticks : (ticks * 6) / 10;
150 }
151
152 static inline u32 no_reboot_bit(struct iTCO_wdt_private *p)
153 {
154 u32 enable_bit;
155
156 switch (p->iTCO_version) {
157 case 5:
158 case 3:
159 enable_bit = 0x00000010;
160 break;
161 case 2:
162 enable_bit = 0x00000020;
163 break;
164 case 4:
165 case 1:
166 default:
167 enable_bit = 0x00000002;
168 break;
169 }
170
171 return enable_bit;
172 }
173
174 static int update_no_reboot_bit_def(void *priv, bool set)
175 {
176 return 0;
177 }
178
179 static int update_no_reboot_bit_pci(void *priv, bool set)
180 {
181 struct iTCO_wdt_private *p = priv;
182 u32 val32 = 0, newval32 = 0;
183
184 pci_read_config_dword(p->pci_dev, 0xd4, &val32);
185 if (set)
186 val32 |= no_reboot_bit(p);
187 else
188 val32 &= ~no_reboot_bit(p);
189 pci_write_config_dword(p->pci_dev, 0xd4, val32);
190 pci_read_config_dword(p->pci_dev, 0xd4, &newval32);
191
192
193 if (val32 != newval32)
194 return -EIO;
195
196 return 0;
197 }
198
199 static int update_no_reboot_bit_mem(void *priv, bool set)
200 {
201 struct iTCO_wdt_private *p = priv;
202 u32 val32 = 0, newval32 = 0;
203
204 val32 = readl(p->gcs_pmc);
205 if (set)
206 val32 |= no_reboot_bit(p);
207 else
208 val32 &= ~no_reboot_bit(p);
209 writel(val32, p->gcs_pmc);
210 newval32 = readl(p->gcs_pmc);
211
212
213 if (val32 != newval32)
214 return -EIO;
215
216 return 0;
217 }
218
219 static int update_no_reboot_bit_cnt(void *priv, bool set)
220 {
221 struct iTCO_wdt_private *p = priv;
222 u16 val, newval;
223
224 val = inw(TCO1_CNT(p));
225 if (set)
226 val |= BIT(0);
227 else
228 val &= ~BIT(0);
229 outw(val, TCO1_CNT(p));
230 newval = inw(TCO1_CNT(p));
231
232
233 return val != newval ? -EIO : 0;
234 }
235
236 static void iTCO_wdt_no_reboot_bit_setup(struct iTCO_wdt_private *p,
237 struct itco_wdt_platform_data *pdata)
238 {
239 if (pdata->update_no_reboot_bit) {
240 p->update_no_reboot_bit = pdata->update_no_reboot_bit;
241 p->no_reboot_priv = pdata->no_reboot_priv;
242 return;
243 }
244
245 if (p->iTCO_version >= 6)
246 p->update_no_reboot_bit = update_no_reboot_bit_cnt;
247 else if (p->iTCO_version >= 2)
248 p->update_no_reboot_bit = update_no_reboot_bit_mem;
249 else if (p->iTCO_version == 1)
250 p->update_no_reboot_bit = update_no_reboot_bit_pci;
251 else
252 p->update_no_reboot_bit = update_no_reboot_bit_def;
253
254 p->no_reboot_priv = p;
255 }
256
257 static int iTCO_wdt_start(struct watchdog_device *wd_dev)
258 {
259 struct iTCO_wdt_private *p = watchdog_get_drvdata(wd_dev);
260 unsigned int val;
261
262 spin_lock(&p->io_lock);
263
264 iTCO_vendor_pre_start(p->smi_res, wd_dev->timeout);
265
266
267 if (p->update_no_reboot_bit(p->no_reboot_priv, false)) {
268 spin_unlock(&p->io_lock);
269 pr_err("failed to reset NO_REBOOT flag, reboot disabled by hardware/BIOS\n");
270 return -EIO;
271 }
272
273
274
275 if (p->iTCO_version >= 2)
276 outw(0x01, TCO_RLD(p));
277 else if (p->iTCO_version == 1)
278 outb(0x01, TCO_RLD(p));
279
280
281 val = inw(TCO1_CNT(p));
282 val &= 0xf7ff;
283 outw(val, TCO1_CNT(p));
284 val = inw(TCO1_CNT(p));
285 spin_unlock(&p->io_lock);
286
287 if (val & 0x0800)
288 return -1;
289 return 0;
290 }
291
292 static int iTCO_wdt_stop(struct watchdog_device *wd_dev)
293 {
294 struct iTCO_wdt_private *p = watchdog_get_drvdata(wd_dev);
295 unsigned int val;
296
297 spin_lock(&p->io_lock);
298
299 iTCO_vendor_pre_stop(p->smi_res);
300
301
302 val = inw(TCO1_CNT(p));
303 val |= 0x0800;
304 outw(val, TCO1_CNT(p));
305 val = inw(TCO1_CNT(p));
306
307
308 p->update_no_reboot_bit(p->no_reboot_priv, true);
309
310 spin_unlock(&p->io_lock);
311
312 if ((val & 0x0800) == 0)
313 return -1;
314 return 0;
315 }
316
317 static int iTCO_wdt_ping(struct watchdog_device *wd_dev)
318 {
319 struct iTCO_wdt_private *p = watchdog_get_drvdata(wd_dev);
320
321 spin_lock(&p->io_lock);
322
323
324 if (p->iTCO_version >= 2) {
325 outw(0x01, TCO_RLD(p));
326 } else if (p->iTCO_version == 1) {
327
328
329 outw(0x0008, TCO1_STS(p));
330
331 outb(0x01, TCO_RLD(p));
332 }
333
334 spin_unlock(&p->io_lock);
335 return 0;
336 }
337
338 static int iTCO_wdt_set_timeout(struct watchdog_device *wd_dev, unsigned int t)
339 {
340 struct iTCO_wdt_private *p = watchdog_get_drvdata(wd_dev);
341 unsigned int val16;
342 unsigned char val8;
343 unsigned int tmrval;
344
345 tmrval = seconds_to_ticks(p, t);
346
347
348 if (p->iTCO_version == 1)
349 tmrval /= 2;
350
351
352
353 if (tmrval < 0x04)
354 return -EINVAL;
355 if ((p->iTCO_version >= 2 && tmrval > 0x3ff) ||
356 (p->iTCO_version == 1 && tmrval > 0x03f))
357 return -EINVAL;
358
359
360 if (p->iTCO_version >= 2) {
361 spin_lock(&p->io_lock);
362 val16 = inw(TCOv2_TMR(p));
363 val16 &= 0xfc00;
364 val16 |= tmrval;
365 outw(val16, TCOv2_TMR(p));
366 val16 = inw(TCOv2_TMR(p));
367 spin_unlock(&p->io_lock);
368
369 if ((val16 & 0x3ff) != tmrval)
370 return -EINVAL;
371 } else if (p->iTCO_version == 1) {
372 spin_lock(&p->io_lock);
373 val8 = inb(TCOv1_TMR(p));
374 val8 &= 0xc0;
375 val8 |= (tmrval & 0xff);
376 outb(val8, TCOv1_TMR(p));
377 val8 = inb(TCOv1_TMR(p));
378 spin_unlock(&p->io_lock);
379
380 if ((val8 & 0x3f) != tmrval)
381 return -EINVAL;
382 }
383
384 wd_dev->timeout = t;
385 return 0;
386 }
387
388 static unsigned int iTCO_wdt_get_timeleft(struct watchdog_device *wd_dev)
389 {
390 struct iTCO_wdt_private *p = watchdog_get_drvdata(wd_dev);
391 unsigned int val16;
392 unsigned char val8;
393 unsigned int time_left = 0;
394
395
396 if (p->iTCO_version >= 2) {
397 spin_lock(&p->io_lock);
398 val16 = inw(TCO_RLD(p));
399 val16 &= 0x3ff;
400 spin_unlock(&p->io_lock);
401
402 time_left = ticks_to_seconds(p, val16);
403 } else if (p->iTCO_version == 1) {
404 spin_lock(&p->io_lock);
405 val8 = inb(TCO_RLD(p));
406 val8 &= 0x3f;
407 if (!(inw(TCO1_STS(p)) & 0x0008))
408 val8 += (inb(TCOv1_TMR(p)) & 0x3f);
409 spin_unlock(&p->io_lock);
410
411 time_left = ticks_to_seconds(p, val8);
412 }
413 return time_left;
414 }
415
416
417
418
419
420 static const struct watchdog_info ident = {
421 .options = WDIOF_SETTIMEOUT |
422 WDIOF_KEEPALIVEPING |
423 WDIOF_MAGICCLOSE,
424 .firmware_version = 0,
425 .identity = DRV_NAME,
426 };
427
428 static const struct watchdog_ops iTCO_wdt_ops = {
429 .owner = THIS_MODULE,
430 .start = iTCO_wdt_start,
431 .stop = iTCO_wdt_stop,
432 .ping = iTCO_wdt_ping,
433 .set_timeout = iTCO_wdt_set_timeout,
434 .get_timeleft = iTCO_wdt_get_timeleft,
435 };
436
437
438
439
440
441 static int iTCO_wdt_probe(struct platform_device *pdev)
442 {
443 struct device *dev = &pdev->dev;
444 struct itco_wdt_platform_data *pdata = dev_get_platdata(dev);
445 struct iTCO_wdt_private *p;
446 unsigned long val32;
447 int ret;
448
449 if (!pdata)
450 return -ENODEV;
451
452 p = devm_kzalloc(dev, sizeof(*p), GFP_KERNEL);
453 if (!p)
454 return -ENOMEM;
455
456 spin_lock_init(&p->io_lock);
457
458 p->tco_res = platform_get_resource(pdev, IORESOURCE_IO, ICH_RES_IO_TCO);
459 if (!p->tco_res)
460 return -ENODEV;
461
462 p->iTCO_version = pdata->version;
463 p->pci_dev = to_pci_dev(dev->parent);
464
465 p->smi_res = platform_get_resource(pdev, IORESOURCE_IO, ICH_RES_IO_SMI);
466 if (p->smi_res) {
467
468 if (!devm_request_region(dev, p->smi_res->start,
469 resource_size(p->smi_res),
470 pdev->name)) {
471 pr_err("I/O address 0x%04llx already in use, device disabled\n",
472 (u64)SMI_EN(p));
473 return -EBUSY;
474 }
475 } else if (iTCO_vendorsupport ||
476 turn_SMI_watchdog_clear_off >= p->iTCO_version) {
477 pr_err("SMI I/O resource is missing\n");
478 return -ENODEV;
479 }
480
481 iTCO_wdt_no_reboot_bit_setup(p, pdata);
482
483
484
485
486
487 if (p->iTCO_version >= 2 && p->iTCO_version < 6 &&
488 !pdata->update_no_reboot_bit) {
489 p->gcs_pmc_res = platform_get_resource(pdev,
490 IORESOURCE_MEM,
491 ICH_RES_MEM_GCS_PMC);
492 p->gcs_pmc = devm_ioremap_resource(dev, p->gcs_pmc_res);
493 if (IS_ERR(p->gcs_pmc))
494 return PTR_ERR(p->gcs_pmc);
495 }
496
497
498 if (p->update_no_reboot_bit(p->no_reboot_priv, false) &&
499 iTCO_vendor_check_noreboot_on()) {
500 pr_info("unable to reset NO_REBOOT flag, device disabled by hardware/BIOS\n");
501 return -ENODEV;
502 }
503
504
505 p->update_no_reboot_bit(p->no_reboot_priv, true);
506
507 if (turn_SMI_watchdog_clear_off >= p->iTCO_version) {
508
509
510
511
512 val32 = inl(SMI_EN(p));
513 val32 &= 0xffffdfff;
514 outl(val32, SMI_EN(p));
515 }
516
517 if (!devm_request_region(dev, p->tco_res->start,
518 resource_size(p->tco_res),
519 pdev->name)) {
520 pr_err("I/O address 0x%04llx already in use, device disabled\n",
521 (u64)TCOBASE(p));
522 return -EBUSY;
523 }
524
525 pr_info("Found a %s TCO device (Version=%d, TCOBASE=0x%04llx)\n",
526 pdata->name, pdata->version, (u64)TCOBASE(p));
527
528
529 switch (p->iTCO_version) {
530 case 6:
531 case 5:
532 case 4:
533 outw(0x0008, TCO1_STS(p));
534 outw(0x0002, TCO2_STS(p));
535 break;
536 case 3:
537 outl(0x20008, TCO1_STS(p));
538 break;
539 case 2:
540 case 1:
541 default:
542 outw(0x0008, TCO1_STS(p));
543 outw(0x0002, TCO2_STS(p));
544 outw(0x0004, TCO2_STS(p));
545 break;
546 }
547
548 p->wddev.info = &ident,
549 p->wddev.ops = &iTCO_wdt_ops,
550 p->wddev.bootstatus = 0;
551 p->wddev.timeout = WATCHDOG_TIMEOUT;
552 watchdog_set_nowayout(&p->wddev, nowayout);
553 p->wddev.parent = dev;
554
555 watchdog_set_drvdata(&p->wddev, p);
556 platform_set_drvdata(pdev, p);
557
558
559 iTCO_wdt_stop(&p->wddev);
560
561
562
563 if (iTCO_wdt_set_timeout(&p->wddev, heartbeat)) {
564 iTCO_wdt_set_timeout(&p->wddev, WATCHDOG_TIMEOUT);
565 pr_info("timeout value out of range, using %d\n",
566 WATCHDOG_TIMEOUT);
567 }
568
569 watchdog_stop_on_reboot(&p->wddev);
570 watchdog_stop_on_unregister(&p->wddev);
571 ret = devm_watchdog_register_device(dev, &p->wddev);
572 if (ret != 0) {
573 pr_err("cannot register watchdog device (err=%d)\n", ret);
574 return ret;
575 }
576
577 pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
578 heartbeat, nowayout);
579
580 return 0;
581 }
582
583 #ifdef CONFIG_PM_SLEEP
584
585
586
587
588
589
590 #ifdef CONFIG_ACPI
591 static inline bool need_suspend(void)
592 {
593 return acpi_target_system_state() == ACPI_STATE_S0;
594 }
595 #else
596 static inline bool need_suspend(void) { return true; }
597 #endif
598
599 static int iTCO_wdt_suspend_noirq(struct device *dev)
600 {
601 struct iTCO_wdt_private *p = dev_get_drvdata(dev);
602 int ret = 0;
603
604 p->suspended = false;
605 if (watchdog_active(&p->wddev) && need_suspend()) {
606 ret = iTCO_wdt_stop(&p->wddev);
607 if (!ret)
608 p->suspended = true;
609 }
610 return ret;
611 }
612
613 static int iTCO_wdt_resume_noirq(struct device *dev)
614 {
615 struct iTCO_wdt_private *p = dev_get_drvdata(dev);
616
617 if (p->suspended)
618 iTCO_wdt_start(&p->wddev);
619
620 return 0;
621 }
622
623 static const struct dev_pm_ops iTCO_wdt_pm = {
624 .suspend_noirq = iTCO_wdt_suspend_noirq,
625 .resume_noirq = iTCO_wdt_resume_noirq,
626 };
627
628 #define ITCO_WDT_PM_OPS (&iTCO_wdt_pm)
629 #else
630 #define ITCO_WDT_PM_OPS NULL
631 #endif
632
633 static struct platform_driver iTCO_wdt_driver = {
634 .probe = iTCO_wdt_probe,
635 .driver = {
636 .name = DRV_NAME,
637 .pm = ITCO_WDT_PM_OPS,
638 },
639 };
640
641 static int __init iTCO_wdt_init_module(void)
642 {
643 pr_info("Intel TCO WatchDog Timer Driver v%s\n", DRV_VERSION);
644
645 return platform_driver_register(&iTCO_wdt_driver);
646 }
647
648 static void __exit iTCO_wdt_cleanup_module(void)
649 {
650 platform_driver_unregister(&iTCO_wdt_driver);
651 pr_info("Watchdog Module Unloaded\n");
652 }
653
654 module_init(iTCO_wdt_init_module);
655 module_exit(iTCO_wdt_cleanup_module);
656
657 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
658 MODULE_DESCRIPTION("Intel TCO WatchDog Timer Driver");
659 MODULE_VERSION(DRV_VERSION);
660 MODULE_LICENSE("GPL");
661 MODULE_ALIAS("platform:" DRV_NAME);