drivers/acpi/sleep.c

   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 }