drivers/acpi/hardware/hwsleep.c

   1
   2 /******************************************************************************
   3  *
   4  * Name: hwsleep.c - ACPI Hardware Sleep/Wake Interface
   5  *
   6  *****************************************************************************/
   7
   8 /******************************************************************************
   9  *
  10  * 1. Copyright Notice
  11  *
  12  * Some or all of this work - Copyright (c) 1999 - 2010, Intel Corp.
  13  * All rights reserved.
  14  *
  15  * 2. License
  16  *
  17  * 2.1. This is your license from Intel Corp. under its intellectual property
  18  * rights.  You may have additional license terms from the party that provided
  19  * you this software, covering your right to use that party's intellectual
  20  * property rights.
  21  *
  22  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
  23  * copy of the source code appearing in this file ("Covered Code") an
  24  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
  25  * base code distributed originally by Intel ("Original Intel Code") to copy,
  26  * make derivatives, distribute, use and display any portion of the Covered
  27  * Code in any form, with the right to sublicense such rights; and
  28  *
  29  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
  30  * license (with the right to sublicense), under only those claims of Intel
  31  * patents that are infringed by the Original Intel Code, to make, use, sell,
  32  * offer to sell, and import the Covered Code and derivative works thereof
  33  * solely to the minimum extent necessary to exercise the above copyright
  34  * license, and in no event shall the patent license extend to any additions
  35  * to or modifications of the Original Intel Code.  No other license or right
  36  * is granted directly or by implication, estoppel or otherwise;
  37  *
  38  * The above copyright and patent license is granted only if the following
  39  * conditions are met:
  40  *
  41  * 3. Conditions
  42  *
  43  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
  44  * Redistribution of source code of any substantial portion of the Covered
  45  * Code or modification with rights to further distribute source must include
  46  * the above Copyright Notice, the above License, this list of Conditions,
  47  * and the following Disclaimer and Export Compliance provision.  In addition,
  48  * Licensee must cause all Covered Code to which Licensee contributes to
  49  * contain a file documenting the changes Licensee made to create that Covered
  50  * Code and the date of any change.  Licensee must include in that file the
  51  * documentation of any changes made by any predecessor Licensee.  Licensee
  52  * must include a prominent statement that the modification is derived,
  53  * directly or indirectly, from Original Intel Code.
  54  *
  55  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
  56  * Redistribution of source code of any substantial portion of the Covered
  57  * Code or modification without rights to further distribute source must
  58  * include the following Disclaimer and Export Compliance provision in the
  59  * documentation and/or other materials provided with distribution.  In
  60  * addition, Licensee may not authorize further sublicense of source of any
  61  * portion of the Covered Code, and must include terms to the effect that the
  62  * license from Licensee to its licensee is limited to the intellectual
  63  * property embodied in the software Licensee provides to its licensee, and
  64  * not to intellectual property embodied in modifications its licensee may
  65  * make.
  66  *
  67  * 3.3. Redistribution of Executable. Redistribution in executable form of any
  68  * substantial portion of the Covered Code or modification must reproduce the
  69  * above Copyright Notice, and the following Disclaimer and Export Compliance
  70  * provision in the documentation and/or other materials provided with the
  71  * distribution.
  72  *
  73  * 3.4. Intel retains all right, title, and interest in and to the Original
  74  * Intel Code.
  75  *
  76  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
  77  * Intel shall be used in advertising or otherwise to promote the sale, use or
  78  * other dealings in products derived from or relating to the Covered Code
  79  * without prior written authorization from Intel.
  80  *
  81  * 4. Disclaimer and Export Compliance
  82  *
  83  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
  84  * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
  85  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
  86  * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
  87  * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
  88  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
  89  * PARTICULAR PURPOSE.
  90  *
  91  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
  92  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
  93  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
  94  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
  95  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
  96  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
  97  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
  98  * LIMITED REMEDY.
  99  *
 100  * 4.3. Licensee shall not export, either directly or indirectly, any of this
 101  * software or system incorporating such software without first obtaining any
 102  * required license or other approval from the U. S. Department of Commerce or
 103  * any other agency or department of the United States Government.  In the
 104  * event Licensee exports any such software from the United States or
 105  * re-exports any such software from a foreign destination, Licensee shall
 106  * ensure that the distribution and export/re-export of the software is in
 107  * compliance with all laws, regulations, orders, or other restrictions of the
 108  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
 109  * any of its subsidiaries will export/re-export any technical data, process,
 110  * software, or service, directly or indirectly, to any country for which the
 111  * United States government or any agency thereof requires an export license,
 112  * other governmental approval, or letter of assurance, without first obtaining
 113  * such license, approval or letter.
 114  *
 115  *****************************************************************************/
 116
 117 #include "acpi.h"
 118 #include "accommon.h"
 119
 120 #define _COMPONENT          ACPI_HARDWARE
 121         ACPI_MODULE_NAME    ("hwsleep")
 122
 123
 124 /*******************************************************************************
 125  *
 126  * FUNCTION:    AcpiSetFirmwareWakingVector
 127  *
 128  * PARAMETERS:  PhysicalAddress     - 32-bit physical address of ACPI real mode
 129  *                                    entry point.
 130  *
 131  * RETURN:      Status
 132  *
 133  * DESCRIPTION: Sets the 32-bit FirmwareWakingVector field of the FACS
 134  *
 135  ******************************************************************************/
 136
 137 ACPI_STATUS
 138 AcpiSetFirmwareWakingVector (
 139     UINT32                  PhysicalAddress)
 140 {
 141     ACPI_FUNCTION_TRACE (AcpiSetFirmwareWakingVector);
 142
 143
 144     /* Set the 32-bit vector */
 145
 146     AcpiGbl_FACS->FirmwareWakingVector = PhysicalAddress;
 147
 148     /* Clear the 64-bit vector if it exists */
 149
 150     if ((AcpiGbl_FACS->Length > 32) && (AcpiGbl_FACS->Version >= 1))
 151     {
 152         AcpiGbl_FACS->XFirmwareWakingVector = 0;
 153     }
 154
 155     return_ACPI_STATUS (AE_OK);
 156 }
 157
 158 ACPI_EXPORT_SYMBOL (AcpiSetFirmwareWakingVector)
 159
 160
 161 #if ACPI_MACHINE_WIDTH == 64
 162 /*******************************************************************************
 163  *
 164  * FUNCTION:    AcpiSetFirmwareWakingVector64
 165  *
 166  * PARAMETERS:  PhysicalAddress     - 64-bit physical address of ACPI protected
 167  *                                    mode entry point.
 168  *
 169  * RETURN:      Status
 170  *
 171  * DESCRIPTION: Sets the 64-bit X_FirmwareWakingVector field of the FACS, if
 172  *              it exists in the table. This function is intended for use with
 173  *              64-bit host operating systems.
 174  *
 175  ******************************************************************************/
 176
 177 ACPI_STATUS
 178 AcpiSetFirmwareWakingVector64 (
 179     UINT64                  PhysicalAddress)
 180 {
 181     ACPI_FUNCTION_TRACE (AcpiSetFirmwareWakingVector64);
 182
 183
 184     /* Determine if the 64-bit vector actually exists */
 185
 186     if ((AcpiGbl_FACS->Length <= 32) || (AcpiGbl_FACS->Version < 1))
 187     {
 188         return_ACPI_STATUS (AE_NOT_EXIST);
 189     }
 190
 191     /* Clear 32-bit vector, set the 64-bit X_ vector */
 192
 193     AcpiGbl_FACS->FirmwareWakingVector = 0;
 194     AcpiGbl_FACS->XFirmwareWakingVector = PhysicalAddress;
 195     return_ACPI_STATUS (AE_OK);
 196 }
 197
 198 ACPI_EXPORT_SYMBOL (AcpiSetFirmwareWakingVector64)
 199 #endif
 200
 201 /*******************************************************************************
 202  *
 203  * FUNCTION:    AcpiEnterSleepStatePrep
 204  *
 205  * PARAMETERS:  SleepState          - Which sleep state to enter
 206  *
 207  * RETURN:      Status
 208  *
 209  * DESCRIPTION: Prepare to enter a system sleep state (see ACPI 2.0 spec p 231)
 210  *              This function must execute with interrupts enabled.
 211  *              We break sleeping into 2 stages so that OSPM can handle
 212  *              various OS-specific tasks between the two steps.
 213  *
 214  ******************************************************************************/
 215
 216 ACPI_STATUS
 217 AcpiEnterSleepStatePrep (
 218     UINT8                   SleepState)
 219 {
 220     ACPI_STATUS             Status;
 221     ACPI_OBJECT_LIST        ArgList;
 222     ACPI_OBJECT             Arg;
 223
 224
 225     ACPI_FUNCTION_TRACE (AcpiEnterSleepStatePrep);
 226
 227
 228     /* _PSW methods could be run here to enable wake-on keyboard, LAN, etc. */
 229
 230     Status = AcpiGetSleepTypeData (SleepState,
 231                     &AcpiGbl_SleepTypeA, &AcpiGbl_SleepTypeB);
 232     if (ACPI_FAILURE (Status))
 233     {
 234         return_ACPI_STATUS (Status);
 235     }
 236
 237     /* Execute the _PTS method (Prepare To Sleep) */
 238
 239     ArgList.Count = 1;
 240     ArgList.Pointer = &Arg;
 241     Arg.Type = ACPI_TYPE_INTEGER;
 242     Arg.Integer.Value = SleepState;
 243
 244     Status = AcpiEvaluateObject (NULL, METHOD_NAME__PTS, &ArgList, NULL);
 245     if (ACPI_FAILURE (Status) && Status != AE_NOT_FOUND)
 246     {
 247         return_ACPI_STATUS (Status);
 248     }
 249
 250     /* Setup the argument to the _SST method (System STatus) */
 251
 252     switch (SleepState)
 253     {
 254     case ACPI_STATE_S0:
 255         Arg.Integer.Value = ACPI_SST_WORKING;
 256         break;
 257
 258     case ACPI_STATE_S1:
 259     case ACPI_STATE_S2:
 260     case ACPI_STATE_S3:
 261         Arg.Integer.Value = ACPI_SST_SLEEPING;
 262         break;
 263
 264     case ACPI_STATE_S4:
 265         Arg.Integer.Value = ACPI_SST_SLEEP_CONTEXT;
 266         break;
 267
 268     default:
 269         Arg.Integer.Value = ACPI_SST_INDICATOR_OFF; /* Default is off */
 270         break;
 271     }
 272
 273     /*
 274      * Set the system indicators to show the desired sleep state.
 275      * _SST is an optional method (return no error if not found)
 276      */
 277     Status = AcpiEvaluateObject (NULL, METHOD_NAME__SST, &ArgList, NULL);
 278     if (ACPI_FAILURE (Status) && Status != AE_NOT_FOUND)
 279     {
 280         ACPI_EXCEPTION ((AE_INFO, Status, "While executing method _SST"));
 281     }
 282
 283     return_ACPI_STATUS (AE_OK);
 284 }
 285
 286 ACPI_EXPORT_SYMBOL (AcpiEnterSleepStatePrep)
 287
 288
 289 /*******************************************************************************
 290  *
 291  * FUNCTION:    AcpiEnterSleepState
 292  *
 293  * PARAMETERS:  SleepState          - Which sleep state to enter
 294  *
 295  * RETURN:      Status
 296  *
 297  * DESCRIPTION: Enter a system sleep state
 298  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 299  *
 300  ******************************************************************************/
 301
 302 ACPI_STATUS
 303 AcpiEnterSleepState (
 304     UINT8                   SleepState)
 305 {
 306     UINT32                  Pm1aControl;
 307     UINT32                  Pm1bControl;
 308     ACPI_BIT_REGISTER_INFO  *SleepTypeRegInfo;
 309     ACPI_BIT_REGISTER_INFO  *SleepEnableRegInfo;
 310     UINT32                  InValue;
 311     ACPI_OBJECT_LIST        ArgList;
 312     ACPI_OBJECT             Arg;
 313     ACPI_STATUS             Status;
 314
 315
 316     ACPI_FUNCTION_TRACE (AcpiEnterSleepState);
 317
 318
 319     if ((AcpiGbl_SleepTypeA > ACPI_SLEEP_TYPE_MAX) ||
 320         (AcpiGbl_SleepTypeB > ACPI_SLEEP_TYPE_MAX))
 321     {
 322         ACPI_ERROR ((AE_INFO, "Sleep values out of range: A=0x%X B=0x%X",
 323             AcpiGbl_SleepTypeA, AcpiGbl_SleepTypeB));
 324         return_ACPI_STATUS (AE_AML_OPERAND_VALUE);
 325     }
 326
 327     SleepTypeRegInfo   = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_TYPE);
 328     SleepEnableRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_ENABLE);
 329
 330     /* Clear wake status */
 331
 332     Status = AcpiWriteBitRegister (ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
 333     if (ACPI_FAILURE (Status))
 334     {
 335         return_ACPI_STATUS (Status);
 336     }
 337
 338     /* Clear all fixed and general purpose status bits */
 339
 340     Status = AcpiHwClearAcpiStatus ();
 341     if (ACPI_FAILURE (Status))
 342     {
 343         return_ACPI_STATUS (Status);
 344     }
 345
 346     if (SleepState != ACPI_STATE_S5)
 347     {
 348         /*
 349          * Disable BM arbitration. This feature is contained within an
 350          * optional register (PM2 Control), so ignore a BAD_ADDRESS
 351          * exception.
 352          */
 353         Status = AcpiWriteBitRegister (ACPI_BITREG_ARB_DISABLE, 1);
 354         if (ACPI_FAILURE (Status) && (Status != AE_BAD_ADDRESS))
 355         {
 356             return_ACPI_STATUS (Status);
 357         }
 358     }
 359
 360     /*
 361      * 1) Disable/Clear all GPEs
 362      * 2) Enable all wakeup GPEs
 363      */
 364     Status = AcpiHwDisableAllGpes ();
 365     if (ACPI_FAILURE (Status))
 366     {
 367         return_ACPI_STATUS (Status);
 368     }
 369     AcpiGbl_SystemAwakeAndRunning = FALSE;
 370
 371     Status = AcpiHwEnableAllWakeupGpes ();
 372     if (ACPI_FAILURE (Status))
 373     {
 374         return_ACPI_STATUS (Status);
 375     }
 376
 377     /* Execute the _GTS method (Going To Sleep) */
 378
 379     ArgList.Count = 1;
 380     ArgList.Pointer = &Arg;
 381     Arg.Type = ACPI_TYPE_INTEGER;
 382     Arg.Integer.Value = SleepState;
 383
 384     Status = AcpiEvaluateObject (NULL, METHOD_NAME__GTS, &ArgList, NULL);
 385     if (ACPI_FAILURE (Status) && Status != AE_NOT_FOUND)
 386     {
 387         return_ACPI_STATUS (Status);
 388     }
 389
 390     /* Get current value of PM1A control */
 391
 392     Status = AcpiHwRegisterRead (ACPI_REGISTER_PM1_CONTROL,
 393                 &Pm1aControl);
 394     if (ACPI_FAILURE (Status))
 395     {
 396         return_ACPI_STATUS (Status);
 397     }
 398     ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
 399         "Entering sleep state [S%u]\n", SleepState));
 400
 401     /* Clear the SLP_EN and SLP_TYP fields */
 402
 403     Pm1aControl &= ~(SleepTypeRegInfo->AccessBitMask |
 404                      SleepEnableRegInfo->AccessBitMask);
 405     Pm1bControl = Pm1aControl;
 406
 407     /* Insert the SLP_TYP bits */
 408
 409     Pm1aControl |= (AcpiGbl_SleepTypeA << SleepTypeRegInfo->BitPosition);
 410     Pm1bControl |= (AcpiGbl_SleepTypeB << SleepTypeRegInfo->BitPosition);
 411
 412     /*
 413      * We split the writes of SLP_TYP and SLP_EN to workaround
 414      * poorly implemented hardware.
 415      */
 416
 417     /* Write #1: write the SLP_TYP data to the PM1 Control registers */
 418
 419     Status = AcpiHwWritePm1Control (Pm1aControl, Pm1bControl);
 420     if (ACPI_FAILURE (Status))
 421     {
 422         return_ACPI_STATUS (Status);
 423     }
 424
 425     /* Insert the sleep enable (SLP_EN) bit */
 426
 427     Pm1aControl |= SleepEnableRegInfo->AccessBitMask;
 428     Pm1bControl |= SleepEnableRegInfo->AccessBitMask;
 429
 430     /* Flush caches, as per ACPI specification */
 431
 432     ACPI_FLUSH_CPU_CACHE ();
 433
 434     /* Write #2: Write both SLP_TYP + SLP_EN */
 435
 436     Status = AcpiHwWritePm1Control (Pm1aControl, Pm1bControl);
 437     if (ACPI_FAILURE (Status))
 438     {
 439         return_ACPI_STATUS (Status);
 440     }
 441
 442     if (SleepState > ACPI_STATE_S3)
 443     {
 444         /*
 445          * We wanted to sleep > S3, but it didn't happen (by virtue of the
 446          * fact that we are still executing!)
 447          *
 448          * Wait ten seconds, then try again. This is to get S4/S5 to work on
 449          * all machines.
 450          *
 451          * We wait so long to allow chipsets that poll this reg very slowly
 452          * to still read the right value. Ideally, this block would go
 453          * away entirely.
 454          */
 455         AcpiOsStall (10000000);
 456
 457         Status = AcpiHwRegisterWrite (ACPI_REGISTER_PM1_CONTROL,
 458                     SleepEnableRegInfo->AccessBitMask);
 459         if (ACPI_FAILURE (Status))
 460         {
 461             return_ACPI_STATUS (Status);
 462         }
 463     }
 464
 465     /* Wait until we enter sleep state */
 466
 467     do
 468     {
 469         Status = AcpiReadBitRegister (ACPI_BITREG_WAKE_STATUS, &InValue);
 470         if (ACPI_FAILURE (Status))
 471         {
 472             return_ACPI_STATUS (Status);
 473         }
 474
 475         /* Spin until we wake */
 476
 477     } while (!InValue);
 478
 479     return_ACPI_STATUS (AE_OK);
 480 }
 481
 482 ACPI_EXPORT_SYMBOL (AcpiEnterSleepState)
 483
 484
 485 /*******************************************************************************
 486  *
 487  * FUNCTION:    AcpiEnterSleepStateS4bios
 488  *
 489  * PARAMETERS:  None
 490  *
 491  * RETURN:      Status
 492  *
 493  * DESCRIPTION: Perform a S4 bios request.
 494  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 495  *
 496  ******************************************************************************/
 497
 498 ACPI_STATUS
 499 AcpiEnterSleepStateS4bios (
 500     void)
 501 {
 502     UINT32                  InValue;
 503     ACPI_STATUS             Status;
 504
 505
 506     ACPI_FUNCTION_TRACE (AcpiEnterSleepStateS4bios);
 507
 508
 509     /* Clear the wake status bit (PM1) */
 510
 511     Status = AcpiWriteBitRegister (ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
 512     if (ACPI_FAILURE (Status))
 513     {
 514         return_ACPI_STATUS (Status);
 515     }
 516
 517     Status = AcpiHwClearAcpiStatus ();
 518     if (ACPI_FAILURE (Status))
 519     {
 520         return_ACPI_STATUS (Status);
 521     }
 522
 523     /*
 524      * 1) Disable/Clear all GPEs
 525      * 2) Enable all wakeup GPEs
 526      */
 527     Status = AcpiHwDisableAllGpes ();
 528     if (ACPI_FAILURE (Status))
 529     {
 530         return_ACPI_STATUS (Status);
 531     }
 532     AcpiGbl_SystemAwakeAndRunning = FALSE;
 533
 534     Status = AcpiHwEnableAllWakeupGpes ();
 535     if (ACPI_FAILURE (Status))
 536     {
 537         return_ACPI_STATUS (Status);
 538     }
 539
 540     ACPI_FLUSH_CPU_CACHE ();
 541
 542     Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand,
 543                 (UINT32) AcpiGbl_FADT.S4BiosRequest, 8);
 544
 545     do {
 546         AcpiOsStall(1000);
 547         Status = AcpiReadBitRegister (ACPI_BITREG_WAKE_STATUS, &InValue);
 548         if (ACPI_FAILURE (Status))
 549         {
 550             return_ACPI_STATUS (Status);
 551         }
 552     } while (!InValue);
 553
 554     return_ACPI_STATUS (AE_OK);
 555 }
 556
 557 ACPI_EXPORT_SYMBOL (AcpiEnterSleepStateS4bios)
 558
 559
 560 /*******************************************************************************
 561  *
 562  * FUNCTION:    AcpiLeaveSleepState
 563  *
 564  * PARAMETERS:  SleepState          - Which sleep state we just exited
 565  *
 566  * RETURN:      Status
 567  *
 568  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 569  *              Called with interrupts ENABLED.
 570  *
 571  ******************************************************************************/
 572
 573 ACPI_STATUS
 574 AcpiLeaveSleepState (
 575     UINT8                   SleepState)
 576 {
 577     ACPI_OBJECT_LIST        ArgList;
 578     ACPI_OBJECT             Arg;
 579     ACPI_STATUS             Status;
 580     ACPI_BIT_REGISTER_INFO  *SleepTypeRegInfo;
 581     ACPI_BIT_REGISTER_INFO  *SleepEnableRegInfo;
 582     UINT32                  Pm1aControl;
 583     UINT32                  Pm1bControl;
 584
 585
 586     ACPI_FUNCTION_TRACE (AcpiLeaveSleepState);
 587
 588
 589     /*
 590      * Set SLP_TYPE and SLP_EN to state S0.
 591      * This is unclear from the ACPI Spec, but it is required
 592      * by some machines.
 593      */
 594     Status = AcpiGetSleepTypeData (ACPI_STATE_S0,
 595                     &AcpiGbl_SleepTypeA, &AcpiGbl_SleepTypeB);
 596     if (ACPI_SUCCESS (Status))
 597     {
 598         SleepTypeRegInfo =
 599             AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_TYPE);
 600         SleepEnableRegInfo =
 601             AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_ENABLE);
 602
 603         /* Get current value of PM1A control */
 604
 605         Status = AcpiHwRegisterRead (ACPI_REGISTER_PM1_CONTROL,
 606                     &Pm1aControl);
 607         if (ACPI_SUCCESS (Status))
 608         {
 609             /* Clear the SLP_EN and SLP_TYP fields */
 610
 611             Pm1aControl &= ~(SleepTypeRegInfo->AccessBitMask |
 612                 SleepEnableRegInfo->AccessBitMask);
 613             Pm1bControl = Pm1aControl;
 614
 615             /* Insert the SLP_TYP bits */
 616
 617             Pm1aControl |= (AcpiGbl_SleepTypeA <<
 618                 SleepTypeRegInfo->BitPosition);
 619             Pm1bControl |= (AcpiGbl_SleepTypeB <<
 620                 SleepTypeRegInfo->BitPosition);
 621
 622             /* Write the control registers and ignore any errors */
 623
 624             (void) AcpiHwWritePm1Control (Pm1aControl, Pm1bControl);
 625         }
 626     }
 627
 628     /* Ensure EnterSleepStatePrep -> EnterSleepState ordering */
 629
 630     AcpiGbl_SleepTypeA = ACPI_SLEEP_TYPE_INVALID;
 631
 632     /* Setup parameter object */
 633
 634     ArgList.Count = 1;
 635     ArgList.Pointer = &Arg;
 636     Arg.Type = ACPI_TYPE_INTEGER;
 637
 638     /* Ignore any errors from these methods */
 639
 640     Arg.Integer.Value = ACPI_SST_WAKING;
 641     Status = AcpiEvaluateObject (NULL, METHOD_NAME__SST, &ArgList, NULL);
 642     if (ACPI_FAILURE (Status) && Status != AE_NOT_FOUND)
 643     {
 644         ACPI_EXCEPTION ((AE_INFO, Status, "During Method _SST"));
 645     }
 646
 647     Arg.Integer.Value = SleepState;
 648     Status = AcpiEvaluateObject (NULL, METHOD_NAME__BFS, &ArgList, NULL);
 649     if (ACPI_FAILURE (Status) && Status != AE_NOT_FOUND)
 650     {
 651         ACPI_EXCEPTION ((AE_INFO, Status, "During Method _BFS"));
 652     }
 653
 654     Status = AcpiEvaluateObject (NULL, METHOD_NAME__WAK, &ArgList, NULL);
 655     if (ACPI_FAILURE (Status) && Status != AE_NOT_FOUND)
 656     {
 657         ACPI_EXCEPTION ((AE_INFO, Status, "During Method _WAK"));
 658     }
 659     /* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */
 660
 661     /*
 662      * Restore the GPEs:
 663      * 1) Disable/Clear all GPEs
 664      * 2) Enable all runtime GPEs
 665      */
 666     Status = AcpiHwDisableAllGpes ();
 667     if (ACPI_FAILURE (Status))
 668     {
 669         return_ACPI_STATUS (Status);
 670     }
 671     AcpiGbl_SystemAwakeAndRunning = TRUE;
 672
 673     Status = AcpiHwEnableAllRuntimeGpes ();
 674     if (ACPI_FAILURE (Status))
 675     {
 676         return_ACPI_STATUS (Status);
 677     }
 678
 679     /* Enable power button */
 680
 681     (void) AcpiWriteBitRegister(
 682             AcpiGbl_FixedEventInfo[ACPI_EVENT_POWER_BUTTON].EnableRegisterId,
 683             ACPI_ENABLE_EVENT);
 684
 685     (void) AcpiWriteBitRegister(
 686             AcpiGbl_FixedEventInfo[ACPI_EVENT_POWER_BUTTON].StatusRegisterId,
 687             ACPI_CLEAR_STATUS);
 688
 689     /*
 690      * Enable BM arbitration. This feature is contained within an
 691      * optional register (PM2 Control), so ignore a BAD_ADDRESS
 692      * exception.
 693      */
 694     Status = AcpiWriteBitRegister (ACPI_BITREG_ARB_DISABLE, 0);
 695     if (ACPI_FAILURE (Status) && (Status != AE_BAD_ADDRESS))
 696     {
 697         return_ACPI_STATUS (Status);
 698     }
 699
 700     Arg.Integer.Value = ACPI_SST_WORKING;
 701     Status = AcpiEvaluateObject (NULL, METHOD_NAME__SST, &ArgList, NULL);
 702     if (ACPI_FAILURE (Status) && Status != AE_NOT_FOUND)
 703     {
 704         ACPI_EXCEPTION ((AE_INFO, Status, "During Method _SST"));
 705     }
 706
 707     return_ACPI_STATUS (Status);
 708 }
 709
 710 ACPI_EXPORT_SYMBOL (AcpiLeaveSleepState)
 711