drivers/acpi/hardware/hwsleep.c

   1
   2 /******************************************************************************
   3  *
   4  * Name: hwsleep.c - ACPI Hardware Sleep/Wake Interface
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2006, R. Byron Moore
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <linux/module.h>
  46 #include <acpi/acpi.h>
  47
  48 #define _COMPONENT          ACPI_HARDWARE
  49 ACPI_MODULE_NAME("hwsleep")
  50
  51 /*******************************************************************************
  52  *
  53  * FUNCTION:    acpi_set_firmware_waking_vector
  54  *
  55  * PARAMETERS:  physical_address    - Physical address of ACPI real mode
  56  *                                    entry point.
  57  *
  58  * RETURN:      Status
  59  *
  60  * DESCRIPTION: Access function for the firmware_waking_vector field in FACS
  61  *
  62  ******************************************************************************/
  63 acpi_status
  64 acpi_set_firmware_waking_vector(acpi_physical_address physical_address)
  65 {
  66
  67         ACPI_FUNCTION_TRACE("acpi_set_firmware_waking_vector");
  68
  69         /* Set the vector */
  70
  71         if (acpi_gbl_common_fACS.vector_width == 32) {
  72                 *(ACPI_CAST_PTR
  73                   (u32, acpi_gbl_common_fACS.firmware_waking_vector))
  74                     = (u32) physical_address;
  75         } else {
  76                 *acpi_gbl_common_fACS.firmware_waking_vector = physical_address;
  77         }
  78
  79         return_ACPI_STATUS(AE_OK);
  80 }
  81
  82 /*******************************************************************************
  83  *
  84  * FUNCTION:    acpi_get_firmware_waking_vector
  85  *
  86  * PARAMETERS:  *physical_address   - Where the contents of
  87  *                                    the firmware_waking_vector field of
  88  *                                    the FACS will be returned.
  89  *
  90  * RETURN:      Status, vector
  91  *
  92  * DESCRIPTION: Access function for the firmware_waking_vector field in FACS
  93  *
  94  ******************************************************************************/
  95
  96 #ifdef ACPI_FUTURE_USAGE
  97 acpi_status
  98 acpi_get_firmware_waking_vector(acpi_physical_address * physical_address)
  99 {
 100
 101         ACPI_FUNCTION_TRACE("acpi_get_firmware_waking_vector");
 102
 103         if (!physical_address) {
 104                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 105         }
 106
 107         /* Get the vector */
 108
 109         if (acpi_gbl_common_fACS.vector_width == 32) {
 110                 *physical_address = (acpi_physical_address)
 111                     *
 112                     (ACPI_CAST_PTR
 113                      (u32, acpi_gbl_common_fACS.firmware_waking_vector));
 114         } else {
 115                 *physical_address =
 116                     *acpi_gbl_common_fACS.firmware_waking_vector;
 117         }
 118
 119         return_ACPI_STATUS(AE_OK);
 120 }
 121 #endif
 122
 123 /*******************************************************************************
 124  *
 125  * FUNCTION:    acpi_enter_sleep_state_prep
 126  *
 127  * PARAMETERS:  sleep_state         - Which sleep state to enter
 128  *
 129  * RETURN:      Status
 130  *
 131  * DESCRIPTION: Prepare to enter a system sleep state (see ACPI 2.0 spec p 231)
 132  *              This function must execute with interrupts enabled.
 133  *              We break sleeping into 2 stages so that OSPM can handle
 134  *              various OS-specific tasks between the two steps.
 135  *
 136  ******************************************************************************/
 137
 138 acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
 139 {
 140         acpi_status status;
 141         struct acpi_object_list arg_list;
 142         union acpi_object arg;
 143
 144         ACPI_FUNCTION_TRACE("acpi_enter_sleep_state_prep");
 145
 146         /*
 147          * _PSW methods could be run here to enable wake-on keyboard, LAN, etc.
 148          */
 149         status = acpi_get_sleep_type_data(sleep_state,
 150                                           &acpi_gbl_sleep_type_a,
 151                                           &acpi_gbl_sleep_type_b);
 152         if (ACPI_FAILURE(status)) {
 153                 return_ACPI_STATUS(status);
 154         }
 155
 156         /* Setup parameter object */
 157
 158         arg_list.count = 1;
 159         arg_list.pointer = &arg;
 160
 161         arg.type = ACPI_TYPE_INTEGER;
 162         arg.integer.value = sleep_state;
 163
 164         /* Run the _PTS and _GTS methods */
 165
 166         status = acpi_evaluate_object(NULL, METHOD_NAME__PTS, &arg_list, NULL);
 167         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 168                 return_ACPI_STATUS(status);
 169         }
 170
 171         status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &arg_list, NULL);
 172         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 173                 return_ACPI_STATUS(status);
 174         }
 175
 176         /* Setup the argument to _SST */
 177
 178         switch (sleep_state) {
 179         case ACPI_STATE_S0:
 180                 arg.integer.value = ACPI_SST_WORKING;
 181                 break;
 182
 183         case ACPI_STATE_S1:
 184         case ACPI_STATE_S2:
 185         case ACPI_STATE_S3:
 186                 arg.integer.value = ACPI_SST_SLEEPING;
 187                 break;
 188
 189         case ACPI_STATE_S4:
 190                 arg.integer.value = ACPI_SST_SLEEP_CONTEXT;
 191                 break;
 192
 193         default:
 194                 arg.integer.value = ACPI_SST_INDICATOR_OFF;     /* Default is off */
 195                 break;
 196         }
 197
 198         /* Set the system indicators to show the desired sleep state. */
 199
 200         status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
 201         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 202                 ACPI_REPORT_ERROR(("Method _SST failed, %s\n",
 203                                    acpi_format_exception(status)));
 204         }
 205
 206         return_ACPI_STATUS(AE_OK);
 207 }
 208
 209 /*******************************************************************************
 210  *
 211  * FUNCTION:    acpi_enter_sleep_state
 212  *
 213  * PARAMETERS:  sleep_state         - Which sleep state to enter
 214  *
 215  * RETURN:      Status
 216  *
 217  * DESCRIPTION: Enter a system sleep state (see ACPI 2.0 spec p 231)
 218  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 219  *
 220  ******************************************************************************/
 221
 222 acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
 223 {
 224         u32 PM1Acontrol;
 225         u32 PM1Bcontrol;
 226         struct acpi_bit_register_info *sleep_type_reg_info;
 227         struct acpi_bit_register_info *sleep_enable_reg_info;
 228         u32 in_value;
 229         acpi_status status;
 230
 231         ACPI_FUNCTION_TRACE("acpi_enter_sleep_state");
 232
 233         if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
 234             (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
 235                 ACPI_REPORT_ERROR(("Sleep values out of range: A=%X B=%X\n",
 236                                    acpi_gbl_sleep_type_a,
 237                                    acpi_gbl_sleep_type_b));
 238                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 239         }
 240
 241         sleep_type_reg_info =
 242             acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE_A);
 243         sleep_enable_reg_info =
 244             acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
 245
 246         /* Clear wake status */
 247
 248         status =
 249             acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1, ACPI_MTX_DO_NOT_LOCK);
 250         if (ACPI_FAILURE(status)) {
 251                 return_ACPI_STATUS(status);
 252         }
 253
 254         /* Clear all fixed and general purpose status bits */
 255
 256         status = acpi_hw_clear_acpi_status(ACPI_MTX_DO_NOT_LOCK);
 257         if (ACPI_FAILURE(status)) {
 258                 return_ACPI_STATUS(status);
 259         }
 260
 261         /*
 262          * 1) Disable/Clear all GPEs
 263          * 2) Enable all wakeup GPEs
 264          */
 265         status = acpi_hw_disable_all_gpes();
 266         if (ACPI_FAILURE(status)) {
 267                 return_ACPI_STATUS(status);
 268         }
 269         acpi_gbl_system_awake_and_running = FALSE;
 270
 271         status = acpi_hw_enable_all_wakeup_gpes();
 272         if (ACPI_FAILURE(status)) {
 273                 return_ACPI_STATUS(status);
 274         }
 275
 276         /* Get current value of PM1A control */
 277
 278         status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
 279                                        ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);
 280         if (ACPI_FAILURE(status)) {
 281                 return_ACPI_STATUS(status);
 282         }
 283         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 284                           "Entering sleep state [S%d]\n", sleep_state));
 285
 286         /* Clear SLP_EN and SLP_TYP fields */
 287
 288         PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask |
 289                          sleep_enable_reg_info->access_bit_mask);
 290         PM1Bcontrol = PM1Acontrol;
 291
 292         /* Insert SLP_TYP bits */
 293
 294         PM1Acontrol |=
 295             (acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position);
 296         PM1Bcontrol |=
 297             (acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position);
 298
 299         /*
 300          * We split the writes of SLP_TYP and SLP_EN to workaround
 301          * poorly implemented hardware.
 302          */
 303
 304         /* Write #1: fill in SLP_TYP data */
 305
 306         status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 307                                         ACPI_REGISTER_PM1A_CONTROL,
 308                                         PM1Acontrol);
 309         if (ACPI_FAILURE(status)) {
 310                 return_ACPI_STATUS(status);
 311         }
 312
 313         status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 314                                         ACPI_REGISTER_PM1B_CONTROL,
 315                                         PM1Bcontrol);
 316         if (ACPI_FAILURE(status)) {
 317                 return_ACPI_STATUS(status);
 318         }
 319
 320         /* Insert SLP_ENABLE bit */
 321
 322         PM1Acontrol |= sleep_enable_reg_info->access_bit_mask;
 323         PM1Bcontrol |= sleep_enable_reg_info->access_bit_mask;
 324
 325         /* Write #2: SLP_TYP + SLP_EN */
 326
 327         ACPI_FLUSH_CPU_CACHE();
 328
 329         status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 330                                         ACPI_REGISTER_PM1A_CONTROL,
 331                                         PM1Acontrol);
 332         if (ACPI_FAILURE(status)) {
 333                 return_ACPI_STATUS(status);
 334         }
 335
 336         status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 337                                         ACPI_REGISTER_PM1B_CONTROL,
 338                                         PM1Bcontrol);
 339         if (ACPI_FAILURE(status)) {
 340                 return_ACPI_STATUS(status);
 341         }
 342
 343         if (sleep_state > ACPI_STATE_S3) {
 344                 /*
 345                  * We wanted to sleep > S3, but it didn't happen (by virtue of the
 346                  * fact that we are still executing!)
 347                  *
 348                  * Wait ten seconds, then try again. This is to get S4/S5 to work on
 349                  * all machines.
 350                  *
 351                  * We wait so long to allow chipsets that poll this reg very slowly to
 352                  * still read the right value. Ideally, this block would go
 353                  * away entirely.
 354                  */
 355                 acpi_os_stall(10000000);
 356
 357                 status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 358                                                 ACPI_REGISTER_PM1_CONTROL,
 359                                                 sleep_enable_reg_info->
 360                                                 access_bit_mask);
 361                 if (ACPI_FAILURE(status)) {
 362                         return_ACPI_STATUS(status);
 363                 }
 364         }
 365
 366         /* Wait until we enter sleep state */
 367
 368         do {
 369                 status = acpi_get_register(ACPI_BITREG_WAKE_STATUS, &in_value,
 370                                            ACPI_MTX_DO_NOT_LOCK);
 371                 if (ACPI_FAILURE(status)) {
 372                         return_ACPI_STATUS(status);
 373                 }
 374
 375                 /* Spin until we wake */
 376
 377         } while (!in_value);
 378
 379         return_ACPI_STATUS(AE_OK);
 380 }
 381
 382 EXPORT_SYMBOL(acpi_enter_sleep_state);
 383
 384 /*******************************************************************************
 385  *
 386  * FUNCTION:    acpi_enter_sleep_state_s4bios
 387  *
 388  * PARAMETERS:  None
 389  *
 390  * RETURN:      Status
 391  *
 392  * DESCRIPTION: Perform a S4 bios request.
 393  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 394  *
 395  ******************************************************************************/
 396
 397 acpi_status asmlinkage acpi_enter_sleep_state_s4bios(void)
 398 {
 399         u32 in_value;
 400         acpi_status status;
 401
 402         ACPI_FUNCTION_TRACE("acpi_enter_sleep_state_s4bios");
 403
 404         status =
 405             acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1, ACPI_MTX_DO_NOT_LOCK);
 406         if (ACPI_FAILURE(status)) {
 407                 return_ACPI_STATUS(status);
 408         }
 409
 410         status = acpi_hw_clear_acpi_status(ACPI_MTX_DO_NOT_LOCK);
 411         if (ACPI_FAILURE(status)) {
 412                 return_ACPI_STATUS(status);
 413         }
 414
 415         /*
 416          * 1) Disable/Clear all GPEs
 417          * 2) Enable all wakeup GPEs
 418          */
 419         status = acpi_hw_disable_all_gpes();
 420         if (ACPI_FAILURE(status)) {
 421                 return_ACPI_STATUS(status);
 422         }
 423         acpi_gbl_system_awake_and_running = FALSE;
 424
 425         status = acpi_hw_enable_all_wakeup_gpes();
 426         if (ACPI_FAILURE(status)) {
 427                 return_ACPI_STATUS(status);
 428         }
 429
 430         ACPI_FLUSH_CPU_CACHE();
 431
 432         status = acpi_os_write_port(acpi_gbl_FADT->smi_cmd,
 433                                     (u32) acpi_gbl_FADT->S4bios_req, 8);
 434
 435         do {
 436                 acpi_os_stall(1000);
 437                 status = acpi_get_register(ACPI_BITREG_WAKE_STATUS, &in_value,
 438                                            ACPI_MTX_DO_NOT_LOCK);
 439                 if (ACPI_FAILURE(status)) {
 440                         return_ACPI_STATUS(status);
 441                 }
 442         } while (!in_value);
 443
 444         return_ACPI_STATUS(AE_OK);
 445 }
 446
 447 EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios);
 448
 449 /*******************************************************************************
 450  *
 451  * FUNCTION:    acpi_leave_sleep_state
 452  *
 453  * PARAMETERS:  sleep_state         - Which sleep state we just exited
 454  *
 455  * RETURN:      Status
 456  *
 457  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 458  *              Called with interrupts ENABLED.
 459  *
 460  ******************************************************************************/
 461
 462 acpi_status acpi_leave_sleep_state(u8 sleep_state)
 463 {
 464         struct acpi_object_list arg_list;
 465         union acpi_object arg;
 466         acpi_status status;
 467         struct acpi_bit_register_info *sleep_type_reg_info;
 468         struct acpi_bit_register_info *sleep_enable_reg_info;
 469         u32 PM1Acontrol;
 470         u32 PM1Bcontrol;
 471
 472         ACPI_FUNCTION_TRACE("acpi_leave_sleep_state");
 473
 474         /*
 475          * Set SLP_TYPE and SLP_EN to state S0.
 476          * This is unclear from the ACPI Spec, but it is required
 477          * by some machines.
 478          */
 479         status = acpi_get_sleep_type_data(ACPI_STATE_S0,
 480                                           &acpi_gbl_sleep_type_a,
 481                                           &acpi_gbl_sleep_type_b);
 482         if (ACPI_SUCCESS(status)) {
 483                 sleep_type_reg_info =
 484                     acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE_A);
 485                 sleep_enable_reg_info =
 486                     acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
 487
 488                 /* Get current value of PM1A control */
 489
 490                 status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
 491                                                ACPI_REGISTER_PM1_CONTROL,
 492                                                &PM1Acontrol);
 493                 if (ACPI_SUCCESS(status)) {
 494                         /* Clear SLP_EN and SLP_TYP fields */
 495
 496                         PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask |
 497                                          sleep_enable_reg_info->
 498                                          access_bit_mask);
 499                         PM1Bcontrol = PM1Acontrol;
 500
 501                         /* Insert SLP_TYP bits */
 502
 503                         PM1Acontrol |=
 504                             (acpi_gbl_sleep_type_a << sleep_type_reg_info->
 505                              bit_position);
 506                         PM1Bcontrol |=
 507                             (acpi_gbl_sleep_type_b << sleep_type_reg_info->
 508                              bit_position);
 509
 510                         /* Just ignore any errors */
 511
 512                         (void)acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 513                                                      ACPI_REGISTER_PM1A_CONTROL,
 514                                                      PM1Acontrol);
 515                         (void)acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 516                                                      ACPI_REGISTER_PM1B_CONTROL,
 517                                                      PM1Bcontrol);
 518                 }
 519         }
 520
 521         /* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
 522
 523         acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
 524
 525         /* Setup parameter object */
 526
 527         arg_list.count = 1;
 528         arg_list.pointer = &arg;
 529         arg.type = ACPI_TYPE_INTEGER;
 530
 531         /* Ignore any errors from these methods */
 532
 533         arg.integer.value = ACPI_SST_WAKING;
 534         status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
 535         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 536                 ACPI_REPORT_ERROR(("Method _SST failed, %s\n",
 537                                    acpi_format_exception(status)));
 538         }
 539
 540         arg.integer.value = sleep_state;
 541         status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL);
 542         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 543                 ACPI_REPORT_ERROR(("Method _BFS failed, %s\n",
 544                                    acpi_format_exception(status)));
 545         }
 546
 547         status = acpi_evaluate_object(NULL, METHOD_NAME__WAK, &arg_list, NULL);
 548         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 549                 ACPI_REPORT_ERROR(("Method _WAK failed, %s\n",
 550                                    acpi_format_exception(status)));
 551         }
 552         /* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */
 553
 554         /*
 555          * Restore the GPEs:
 556          * 1) Disable/Clear all GPEs
 557          * 2) Enable all runtime GPEs
 558          */
 559         status = acpi_hw_disable_all_gpes();
 560         if (ACPI_FAILURE(status)) {
 561                 return_ACPI_STATUS(status);
 562         }
 563         acpi_gbl_system_awake_and_running = TRUE;
 564
 565         status = acpi_hw_enable_all_runtime_gpes();
 566         if (ACPI_FAILURE(status)) {
 567                 return_ACPI_STATUS(status);
 568         }
 569
 570         /* Enable power button */
 571
 572         (void)
 573             acpi_set_register(acpi_gbl_fixed_event_info
 574                               [ACPI_EVENT_POWER_BUTTON].enable_register_id, 1,
 575                               ACPI_MTX_DO_NOT_LOCK);
 576
 577         (void)
 578             acpi_set_register(acpi_gbl_fixed_event_info
 579                               [ACPI_EVENT_POWER_BUTTON].status_register_id, 1,
 580                               ACPI_MTX_DO_NOT_LOCK);
 581
 582         arg.integer.value = ACPI_SST_WORKING;
 583         status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
 584         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 585                 ACPI_REPORT_ERROR(("Method _SST failed, %s\n",
 586                                    acpi_format_exception(status)));
 587         }
 588
 589         return_ACPI_STATUS(status);
 590 }