1 /*
2 * sleep.c - ACPI sleep support.
3 *
4 * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
5 * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
6 * Copyright (c) 2000-2003 Patrick Mochel
7 * Copyright (c) 2003 Open Source Development Lab
8 *
9 * This file is released under the GPLv2.
10 *
11 */
12
13 #include <linux/delay.h>
14 #include <linux/irq.h>
15 #include <linux/dmi.h>
16 #include <linux/device.h>
17 #include <linux/interrupt.h>
18 #include <linux/suspend.h>
19 #include <linux/reboot.h>
20 #include <linux/acpi.h>
21 #include <linux/module.h>
22 #include <linux/syscore_ops.h>
23 #include <asm/io.h>
24 #include <trace/events/power.h>
25
26 #include "internal.h"
27 #include "sleep.h"
28
29 /*
30 * Some HW-full platforms do not have _S5, so they may need
31 * to leverage efi power off for a shutdown.
32 */
33 bool acpi_no_s5;
34 static u8 sleep_states[ACPI_S_STATE_COUNT];
35
acpi_sleep_tts_switch(u32 acpi_state)36 static void acpi_sleep_tts_switch(u32 acpi_state)
37 {
38 acpi_status status;
39
40 status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state);
41 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
42 /*
43 * OS can't evaluate the _TTS object correctly. Some warning
44 * message will be printed. But it won't break anything.
45 */
46 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
47 }
48 }
49
tts_notify_reboot(struct notifier_block * this,unsigned long code,void * x)50 static int tts_notify_reboot(struct notifier_block *this,
51 unsigned long code, void *x)
52 {
53 acpi_sleep_tts_switch(ACPI_STATE_S5);
54 return NOTIFY_DONE;
55 }
56
57 static struct notifier_block tts_notifier = {
58 .notifier_call = tts_notify_reboot,
59 .next = NULL,
60 .priority = 0,
61 };
62
acpi_sleep_prepare(u32 acpi_state)63 static int acpi_sleep_prepare(u32 acpi_state)
64 {
65 #ifdef CONFIG_ACPI_SLEEP
66 /* do we have a wakeup address for S2 and S3? */
67 if (acpi_state == ACPI_STATE_S3) {
68 if (!acpi_wakeup_address)
69 return -EFAULT;
70 acpi_set_waking_vector(acpi_wakeup_address);
71
72 }
73 ACPI_FLUSH_CPU_CACHE();
74 #endif
75 printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
76 acpi_state);
77 acpi_enable_wakeup_devices(acpi_state);
78 acpi_enter_sleep_state_prep(acpi_state);
79 return 0;
80 }
81
acpi_sleep_state_supported(u8 sleep_state)82 static bool acpi_sleep_state_supported(u8 sleep_state)
83 {
84 acpi_status status;
85 u8 type_a, type_b;
86
87 status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b);
88 return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware
89 || (acpi_gbl_FADT.sleep_control.address
90 && acpi_gbl_FADT.sleep_status.address));
91 }
92
93 #ifdef CONFIG_ACPI_SLEEP
94 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
95
acpi_target_system_state(void)96 u32 acpi_target_system_state(void)
97 {
98 return acpi_target_sleep_state;
99 }
100 EXPORT_SYMBOL_GPL(acpi_target_system_state);
101
102 static bool pwr_btn_event_pending;
103
104 /*
105 * The ACPI specification wants us to save NVS memory regions during hibernation
106 * and to restore them during the subsequent resume. Windows does that also for
107 * suspend to RAM. However, it is known that this mechanism does not work on
108 * all machines, so we allow the user to disable it with the help of the
109 * 'acpi_sleep=nonvs' kernel command line option.
110 */
111 static bool nvs_nosave;
112
acpi_nvs_nosave(void)113 void __init acpi_nvs_nosave(void)
114 {
115 nvs_nosave = true;
116 }
117
118 /*
119 * The ACPI specification wants us to save NVS memory regions during hibernation
120 * but says nothing about saving NVS during S3. Not all versions of Windows
121 * save NVS on S3 suspend either, and it is clear that not all systems need
122 * NVS to be saved at S3 time. To improve suspend/resume time, allow the
123 * user to disable saving NVS on S3 if their system does not require it, but
124 * continue to save/restore NVS for S4 as specified.
125 */
126 static bool nvs_nosave_s3;
127
acpi_nvs_nosave_s3(void)128 void __init acpi_nvs_nosave_s3(void)
129 {
130 nvs_nosave_s3 = true;
131 }
132
init_nvs_save_s3(const struct dmi_system_id * d)133 static int __init init_nvs_save_s3(const struct dmi_system_id *d)
134 {
135 nvs_nosave_s3 = false;
136 return 0;
137 }
138
139 /*
140 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
141 * user to request that behavior by using the 'acpi_old_suspend_ordering'
142 * kernel command line option that causes the following variable to be set.
143 */
144 static bool old_suspend_ordering;
145
acpi_old_suspend_ordering(void)146 void __init acpi_old_suspend_ordering(void)
147 {
148 old_suspend_ordering = true;
149 }
150
init_old_suspend_ordering(const struct dmi_system_id * d)151 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
152 {
153 acpi_old_suspend_ordering();
154 return 0;
155 }
156
init_nvs_nosave(const struct dmi_system_id * d)157 static int __init init_nvs_nosave(const struct dmi_system_id *d)
158 {
159 acpi_nvs_nosave();
160 return 0;
161 }
162
163 static struct dmi_system_id acpisleep_dmi_table[] __initdata = {
164 {
165 .callback = init_old_suspend_ordering,
166 .ident = "Abit KN9 (nForce4 variant)",
167 .matches = {
168 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
169 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
170 },
171 },
172 {
173 .callback = init_old_suspend_ordering,
174 .ident = "HP xw4600 Workstation",
175 .matches = {
176 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
177 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
178 },
179 },
180 {
181 .callback = init_old_suspend_ordering,
182 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
183 .matches = {
184 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
185 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
186 },
187 },
188 {
189 .callback = init_old_suspend_ordering,
190 .ident = "Panasonic CF51-2L",
191 .matches = {
192 DMI_MATCH(DMI_BOARD_VENDOR,
193 "Matsushita Electric Industrial Co.,Ltd."),
194 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
195 },
196 },
197 {
198 .callback = init_nvs_nosave,
199 .ident = "Sony Vaio VGN-FW41E_H",
200 .matches = {
201 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
202 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
203 },
204 },
205 {
206 .callback = init_nvs_nosave,
207 .ident = "Sony Vaio VGN-FW21E",
208 .matches = {
209 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
210 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
211 },
212 },
213 {
214 .callback = init_nvs_nosave,
215 .ident = "Sony Vaio VGN-FW21M",
216 .matches = {
217 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
218 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
219 },
220 },
221 {
222 .callback = init_nvs_nosave,
223 .ident = "Sony Vaio VPCEB17FX",
224 .matches = {
225 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
226 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
227 },
228 },
229 {
230 .callback = init_nvs_nosave,
231 .ident = "Sony Vaio VGN-SR11M",
232 .matches = {
233 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
234 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
235 },
236 },
237 {
238 .callback = init_nvs_nosave,
239 .ident = "Everex StepNote Series",
240 .matches = {
241 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
242 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
243 },
244 },
245 {
246 .callback = init_nvs_nosave,
247 .ident = "Sony Vaio VPCEB1Z1E",
248 .matches = {
249 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
250 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
251 },
252 },
253 {
254 .callback = init_nvs_nosave,
255 .ident = "Sony Vaio VGN-NW130D",
256 .matches = {
257 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
258 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
259 },
260 },
261 {
262 .callback = init_nvs_nosave,
263 .ident = "Sony Vaio VPCCW29FX",
264 .matches = {
265 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
266 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
267 },
268 },
269 {
270 .callback = init_nvs_nosave,
271 .ident = "Averatec AV1020-ED2",
272 .matches = {
273 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
274 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
275 },
276 },
277 {
278 .callback = init_old_suspend_ordering,
279 .ident = "Asus A8N-SLI DELUXE",
280 .matches = {
281 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
282 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
283 },
284 },
285 {
286 .callback = init_old_suspend_ordering,
287 .ident = "Asus A8N-SLI Premium",
288 .matches = {
289 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
290 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
291 },
292 },
293 {
294 .callback = init_nvs_nosave,
295 .ident = "Sony Vaio VGN-SR26GN_P",
296 .matches = {
297 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
298 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
299 },
300 },
301 {
302 .callback = init_nvs_nosave,
303 .ident = "Sony Vaio VPCEB1S1E",
304 .matches = {
305 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
306 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
307 },
308 },
309 {
310 .callback = init_nvs_nosave,
311 .ident = "Sony Vaio VGN-FW520F",
312 .matches = {
313 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
314 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
315 },
316 },
317 {
318 .callback = init_nvs_nosave,
319 .ident = "Asus K54C",
320 .matches = {
321 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
322 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
323 },
324 },
325 {
326 .callback = init_nvs_nosave,
327 .ident = "Asus K54HR",
328 .matches = {
329 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
330 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
331 },
332 },
333 /*
334 * https://bugzilla.kernel.org/show_bug.cgi?id=189431
335 * Lenovo G50-45 is a platform later than 2012, but needs nvs memory
336 * saving during S3.
337 */
338 {
339 .callback = init_nvs_save_s3,
340 .ident = "Lenovo G50-45",
341 .matches = {
342 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
343 DMI_MATCH(DMI_PRODUCT_NAME, "80E3"),
344 },
345 },
346 {},
347 };
348
acpi_sleep_dmi_check(void)349 static void __init acpi_sleep_dmi_check(void)
350 {
351 int year;
352
353 if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year >= 2012)
354 acpi_nvs_nosave_s3();
355
356 dmi_check_system(acpisleep_dmi_table);
357 }
358
359 /**
360 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
361 */
acpi_pm_freeze(void)362 static int acpi_pm_freeze(void)
363 {
364 acpi_disable_all_gpes();
365 acpi_os_wait_events_complete();
366 acpi_ec_block_transactions();
367 return 0;
368 }
369
370 /**
371 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
372 */
acpi_pm_pre_suspend(void)373 static int acpi_pm_pre_suspend(void)
374 {
375 acpi_pm_freeze();
376 return suspend_nvs_save();
377 }
378
379 /**
380 * __acpi_pm_prepare - Prepare the platform to enter the target state.
381 *
382 * If necessary, set the firmware waking vector and do arch-specific
383 * nastiness to get the wakeup code to the waking vector.
384 */
__acpi_pm_prepare(void)385 static int __acpi_pm_prepare(void)
386 {
387 int error = acpi_sleep_prepare(acpi_target_sleep_state);
388 if (error)
389 acpi_target_sleep_state = ACPI_STATE_S0;
390
391 return error;
392 }
393
394 /**
395 * acpi_pm_prepare - Prepare the platform to enter the target sleep
396 * state and disable the GPEs.
397 */
acpi_pm_prepare(void)398 static int acpi_pm_prepare(void)
399 {
400 int error = __acpi_pm_prepare();
401 if (!error)
402 error = acpi_pm_pre_suspend();
403
404 return error;
405 }
406
find_powerf_dev(struct device * dev,void * data)407 static int find_powerf_dev(struct device *dev, void *data)
408 {
409 struct acpi_device *device = to_acpi_device(dev);
410 const char *hid = acpi_device_hid(device);
411
412 return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
413 }
414
415 /**
416 * acpi_pm_finish - Instruct the platform to leave a sleep state.
417 *
418 * This is called after we wake back up (or if entering the sleep state
419 * failed).
420 */
acpi_pm_finish(void)421 static void acpi_pm_finish(void)
422 {
423 struct device *pwr_btn_dev;
424 u32 acpi_state = acpi_target_sleep_state;
425
426 acpi_ec_unblock_transactions();
427 suspend_nvs_free();
428
429 if (acpi_state == ACPI_STATE_S0)
430 return;
431
432 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
433 acpi_state);
434 acpi_disable_wakeup_devices(acpi_state);
435 acpi_leave_sleep_state(acpi_state);
436
437 /* reset firmware waking vector */
438 acpi_set_waking_vector(0);
439
440 acpi_target_sleep_state = ACPI_STATE_S0;
441
442 acpi_resume_power_resources();
443
444 /* If we were woken with the fixed power button, provide a small
445 * hint to userspace in the form of a wakeup event on the fixed power
446 * button device (if it can be found).
447 *
448 * We delay the event generation til now, as the PM layer requires
449 * timekeeping to be running before we generate events. */
450 if (!pwr_btn_event_pending)
451 return;
452
453 pwr_btn_event_pending = false;
454 pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
455 find_powerf_dev);
456 if (pwr_btn_dev) {
457 pm_wakeup_event(pwr_btn_dev, 0);
458 put_device(pwr_btn_dev);
459 }
460 }
461
462 /**
463 * acpi_pm_start - Start system PM transition.
464 */
acpi_pm_start(u32 acpi_state)465 static void acpi_pm_start(u32 acpi_state)
466 {
467 acpi_target_sleep_state = acpi_state;
468 acpi_sleep_tts_switch(acpi_target_sleep_state);
469 acpi_scan_lock_acquire();
470 }
471
472 /**
473 * acpi_pm_end - Finish up system PM transition.
474 */
acpi_pm_end(void)475 static void acpi_pm_end(void)
476 {
477 acpi_turn_off_unused_power_resources();
478 acpi_scan_lock_release();
479 /*
480 * This is necessary in case acpi_pm_finish() is not called during a
481 * failing transition to a sleep state.
482 */
483 acpi_target_sleep_state = ACPI_STATE_S0;
484 acpi_sleep_tts_switch(acpi_target_sleep_state);
485 }
486 #else /* !CONFIG_ACPI_SLEEP */
487 #define acpi_target_sleep_state ACPI_STATE_S0
acpi_sleep_dmi_check(void)488 static inline void acpi_sleep_dmi_check(void) {}
489 #endif /* CONFIG_ACPI_SLEEP */
490
491 #ifdef CONFIG_SUSPEND
492 static u32 acpi_suspend_states[] = {
493 [PM_SUSPEND_ON] = ACPI_STATE_S0,
494 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
495 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
496 [PM_SUSPEND_MAX] = ACPI_STATE_S5
497 };
498
499 /**
500 * acpi_suspend_begin - Set the target system sleep state to the state
501 * associated with given @pm_state, if supported.
502 */
acpi_suspend_begin(suspend_state_t pm_state)503 static int acpi_suspend_begin(suspend_state_t pm_state)
504 {
505 u32 acpi_state = acpi_suspend_states[pm_state];
506 int error;
507
508 error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
509 if (error)
510 return error;
511
512 if (!sleep_states[acpi_state]) {
513 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
514 return -ENOSYS;
515 }
516 if (acpi_state > ACPI_STATE_S1)
517 pm_set_suspend_via_firmware();
518
519 acpi_pm_start(acpi_state);
520 return 0;
521 }
522
523 /**
524 * acpi_suspend_enter - Actually enter a sleep state.
525 * @pm_state: ignored
526 *
527 * Flush caches and go to sleep. For STR we have to call arch-specific
528 * assembly, which in turn call acpi_enter_sleep_state().
529 * It's unfortunate, but it works. Please fix if you're feeling frisky.
530 */
acpi_suspend_enter(suspend_state_t pm_state)531 static int acpi_suspend_enter(suspend_state_t pm_state)
532 {
533 acpi_status status = AE_OK;
534 u32 acpi_state = acpi_target_sleep_state;
535 int error;
536
537 ACPI_FLUSH_CPU_CACHE();
538
539 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
540 switch (acpi_state) {
541 case ACPI_STATE_S1:
542 barrier();
543 status = acpi_enter_sleep_state(acpi_state);
544 break;
545
546 case ACPI_STATE_S3:
547 if (!acpi_suspend_lowlevel)
548 return -ENOSYS;
549 error = acpi_suspend_lowlevel();
550 if (error)
551 return error;
552 pr_info(PREFIX "Low-level resume complete\n");
553 pm_set_resume_via_firmware();
554 break;
555 }
556 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
557
558 /* This violates the spec but is required for bug compatibility. */
559 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
560
561 /* Reprogram control registers */
562 acpi_leave_sleep_state_prep(acpi_state);
563
564 /* ACPI 3.0 specs (P62) says that it's the responsibility
565 * of the OSPM to clear the status bit [ implying that the
566 * POWER_BUTTON event should not reach userspace ]
567 *
568 * However, we do generate a small hint for userspace in the form of
569 * a wakeup event. We flag this condition for now and generate the
570 * event later, as we're currently too early in resume to be able to
571 * generate wakeup events.
572 */
573 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
574 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
575
576 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
577
578 if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
579 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
580 /* Flag for later */
581 pwr_btn_event_pending = true;
582 }
583 }
584
585 /*
586 * Disable and clear GPE status before interrupt is enabled. Some GPEs
587 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
588 * acpi_leave_sleep_state will reenable specific GPEs later
589 */
590 acpi_disable_all_gpes();
591 /* Allow EC transactions to happen. */
592 acpi_ec_unblock_transactions();
593
594 suspend_nvs_restore();
595
596 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
597 }
598
acpi_suspend_state_valid(suspend_state_t pm_state)599 static int acpi_suspend_state_valid(suspend_state_t pm_state)
600 {
601 u32 acpi_state;
602
603 switch (pm_state) {
604 case PM_SUSPEND_ON:
605 case PM_SUSPEND_STANDBY:
606 case PM_SUSPEND_MEM:
607 acpi_state = acpi_suspend_states[pm_state];
608
609 return sleep_states[acpi_state];
610 default:
611 return 0;
612 }
613 }
614
615 static const struct platform_suspend_ops acpi_suspend_ops = {
616 .valid = acpi_suspend_state_valid,
617 .begin = acpi_suspend_begin,
618 .prepare_late = acpi_pm_prepare,
619 .enter = acpi_suspend_enter,
620 .wake = acpi_pm_finish,
621 .end = acpi_pm_end,
622 };
623
624 /**
625 * acpi_suspend_begin_old - Set the target system sleep state to the
626 * state associated with given @pm_state, if supported, and
627 * execute the _PTS control method. This function is used if the
628 * pre-ACPI 2.0 suspend ordering has been requested.
629 */
acpi_suspend_begin_old(suspend_state_t pm_state)630 static int acpi_suspend_begin_old(suspend_state_t pm_state)
631 {
632 int error = acpi_suspend_begin(pm_state);
633 if (!error)
634 error = __acpi_pm_prepare();
635
636 return error;
637 }
638
639 /*
640 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
641 * been requested.
642 */
643 static const struct platform_suspend_ops acpi_suspend_ops_old = {
644 .valid = acpi_suspend_state_valid,
645 .begin = acpi_suspend_begin_old,
646 .prepare_late = acpi_pm_pre_suspend,
647 .enter = acpi_suspend_enter,
648 .wake = acpi_pm_finish,
649 .end = acpi_pm_end,
650 .recover = acpi_pm_finish,
651 };
652
acpi_freeze_begin(void)653 static int acpi_freeze_begin(void)
654 {
655 acpi_scan_lock_acquire();
656 return 0;
657 }
658
acpi_freeze_prepare(void)659 static int acpi_freeze_prepare(void)
660 {
661 acpi_enable_wakeup_devices(ACPI_STATE_S0);
662 acpi_enable_all_wakeup_gpes();
663 acpi_os_wait_events_complete();
664 if (acpi_sci_irq_valid())
665 enable_irq_wake(acpi_sci_irq);
666 return 0;
667 }
668
acpi_freeze_restore(void)669 static void acpi_freeze_restore(void)
670 {
671 acpi_disable_wakeup_devices(ACPI_STATE_S0);
672 if (acpi_sci_irq_valid())
673 disable_irq_wake(acpi_sci_irq);
674 acpi_enable_all_runtime_gpes();
675 }
676
acpi_freeze_end(void)677 static void acpi_freeze_end(void)
678 {
679 acpi_scan_lock_release();
680 }
681
682 static const struct platform_freeze_ops acpi_freeze_ops = {
683 .begin = acpi_freeze_begin,
684 .prepare = acpi_freeze_prepare,
685 .restore = acpi_freeze_restore,
686 .end = acpi_freeze_end,
687 };
688
acpi_sleep_suspend_setup(void)689 static void acpi_sleep_suspend_setup(void)
690 {
691 int i;
692
693 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
694 if (acpi_sleep_state_supported(i))
695 sleep_states[i] = 1;
696
697 suspend_set_ops(old_suspend_ordering ?
698 &acpi_suspend_ops_old : &acpi_suspend_ops);
699 freeze_set_ops(&acpi_freeze_ops);
700 }
701
702 #else /* !CONFIG_SUSPEND */
acpi_sleep_suspend_setup(void)703 static inline void acpi_sleep_suspend_setup(void) {}
704 #endif /* !CONFIG_SUSPEND */
705
706 #ifdef CONFIG_PM_SLEEP
707 static u32 saved_bm_rld;
708
acpi_save_bm_rld(void)709 static int acpi_save_bm_rld(void)
710 {
711 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
712 return 0;
713 }
714
acpi_restore_bm_rld(void)715 static void acpi_restore_bm_rld(void)
716 {
717 u32 resumed_bm_rld = 0;
718
719 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
720 if (resumed_bm_rld == saved_bm_rld)
721 return;
722
723 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
724 }
725
726 static struct syscore_ops acpi_sleep_syscore_ops = {
727 .suspend = acpi_save_bm_rld,
728 .resume = acpi_restore_bm_rld,
729 };
730
acpi_sleep_syscore_init(void)731 void acpi_sleep_syscore_init(void)
732 {
733 register_syscore_ops(&acpi_sleep_syscore_ops);
734 }
735 #else
acpi_sleep_syscore_init(void)736 static inline void acpi_sleep_syscore_init(void) {}
737 #endif /* CONFIG_PM_SLEEP */
738
739 #ifdef CONFIG_HIBERNATION
740 static unsigned long s4_hardware_signature;
741 static struct acpi_table_facs *facs;
742 static bool nosigcheck;
743
acpi_no_s4_hw_signature(void)744 void __init acpi_no_s4_hw_signature(void)
745 {
746 nosigcheck = true;
747 }
748
acpi_hibernation_begin(void)749 static int acpi_hibernation_begin(void)
750 {
751 int error;
752
753 error = nvs_nosave ? 0 : suspend_nvs_alloc();
754 if (!error)
755 acpi_pm_start(ACPI_STATE_S4);
756
757 return error;
758 }
759
acpi_hibernation_enter(void)760 static int acpi_hibernation_enter(void)
761 {
762 acpi_status status = AE_OK;
763
764 ACPI_FLUSH_CPU_CACHE();
765
766 /* This shouldn't return. If it returns, we have a problem */
767 status = acpi_enter_sleep_state(ACPI_STATE_S4);
768 /* Reprogram control registers */
769 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
770
771 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
772 }
773
acpi_hibernation_leave(void)774 static void acpi_hibernation_leave(void)
775 {
776 pm_set_resume_via_firmware();
777 /*
778 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
779 * enable it here.
780 */
781 acpi_enable();
782 /* Reprogram control registers */
783 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
784 /* Check the hardware signature */
785 if (facs && s4_hardware_signature != facs->hardware_signature)
786 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
787 /* Restore the NVS memory area */
788 suspend_nvs_restore();
789 /* Allow EC transactions to happen. */
790 acpi_ec_unblock_transactions();
791 }
792
acpi_pm_thaw(void)793 static void acpi_pm_thaw(void)
794 {
795 acpi_ec_unblock_transactions();
796 acpi_enable_all_runtime_gpes();
797 }
798
799 static const struct platform_hibernation_ops acpi_hibernation_ops = {
800 .begin = acpi_hibernation_begin,
801 .end = acpi_pm_end,
802 .pre_snapshot = acpi_pm_prepare,
803 .finish = acpi_pm_finish,
804 .prepare = acpi_pm_prepare,
805 .enter = acpi_hibernation_enter,
806 .leave = acpi_hibernation_leave,
807 .pre_restore = acpi_pm_freeze,
808 .restore_cleanup = acpi_pm_thaw,
809 };
810
811 /**
812 * acpi_hibernation_begin_old - Set the target system sleep state to
813 * ACPI_STATE_S4 and execute the _PTS control method. This
814 * function is used if the pre-ACPI 2.0 suspend ordering has been
815 * requested.
816 */
acpi_hibernation_begin_old(void)817 static int acpi_hibernation_begin_old(void)
818 {
819 int error;
820 /*
821 * The _TTS object should always be evaluated before the _PTS object.
822 * When the old_suspended_ordering is true, the _PTS object is
823 * evaluated in the acpi_sleep_prepare.
824 */
825 acpi_sleep_tts_switch(ACPI_STATE_S4);
826
827 error = acpi_sleep_prepare(ACPI_STATE_S4);
828
829 if (!error) {
830 if (!nvs_nosave)
831 error = suspend_nvs_alloc();
832 if (!error) {
833 acpi_target_sleep_state = ACPI_STATE_S4;
834 acpi_scan_lock_acquire();
835 }
836 }
837 return error;
838 }
839
840 /*
841 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
842 * been requested.
843 */
844 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
845 .begin = acpi_hibernation_begin_old,
846 .end = acpi_pm_end,
847 .pre_snapshot = acpi_pm_pre_suspend,
848 .prepare = acpi_pm_freeze,
849 .finish = acpi_pm_finish,
850 .enter = acpi_hibernation_enter,
851 .leave = acpi_hibernation_leave,
852 .pre_restore = acpi_pm_freeze,
853 .restore_cleanup = acpi_pm_thaw,
854 .recover = acpi_pm_finish,
855 };
856
acpi_sleep_hibernate_setup(void)857 static void acpi_sleep_hibernate_setup(void)
858 {
859 if (!acpi_sleep_state_supported(ACPI_STATE_S4))
860 return;
861
862 hibernation_set_ops(old_suspend_ordering ?
863 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
864 sleep_states[ACPI_STATE_S4] = 1;
865 if (nosigcheck)
866 return;
867
868 acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
869 if (facs)
870 s4_hardware_signature = facs->hardware_signature;
871 }
872 #else /* !CONFIG_HIBERNATION */
acpi_sleep_hibernate_setup(void)873 static inline void acpi_sleep_hibernate_setup(void) {}
874 #endif /* !CONFIG_HIBERNATION */
875
acpi_power_off_prepare(void)876 static void acpi_power_off_prepare(void)
877 {
878 /* Prepare to power off the system */
879 acpi_sleep_prepare(ACPI_STATE_S5);
880 acpi_disable_all_gpes();
881 acpi_os_wait_events_complete();
882 }
883
acpi_power_off(void)884 static void acpi_power_off(void)
885 {
886 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
887 printk(KERN_DEBUG "%s called\n", __func__);
888 local_irq_disable();
889 acpi_enter_sleep_state(ACPI_STATE_S5);
890 }
891
acpi_sleep_init(void)892 int __init acpi_sleep_init(void)
893 {
894 char supported[ACPI_S_STATE_COUNT * 3 + 1];
895 char *pos = supported;
896 int i;
897
898 acpi_sleep_dmi_check();
899
900 sleep_states[ACPI_STATE_S0] = 1;
901
902 acpi_sleep_syscore_init();
903 acpi_sleep_suspend_setup();
904 acpi_sleep_hibernate_setup();
905
906 if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
907 sleep_states[ACPI_STATE_S5] = 1;
908 pm_power_off_prepare = acpi_power_off_prepare;
909 pm_power_off = acpi_power_off;
910 } else {
911 acpi_no_s5 = true;
912 }
913
914 supported[0] = 0;
915 for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
916 if (sleep_states[i])
917 pos += sprintf(pos, " S%d", i);
918 }
919 pr_info(PREFIX "(supports%s)\n", supported);
920
921 /*
922 * Register the tts_notifier to reboot notifier list so that the _TTS
923 * object can also be evaluated when the system enters S5.
924 */
925 register_reboot_notifier(&tts_notifier);
926 return 0;
927 }
928