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