drivers/acpi/hardware/hwgpe.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: hwgpe - Low level GPE enable/disable/clear functions
   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 #include "acevents.h"
 120
 121 #define _COMPONENT          ACPI_HARDWARE
 122         ACPI_MODULE_NAME    ("hwgpe")
 123
 124 /* Local prototypes */
 125
 126 static ACPI_STATUS
 127 AcpiHwEnableWakeupGpeBlock (
 128     ACPI_GPE_XRUPT_INFO     *GpeXruptInfo,
 129     ACPI_GPE_BLOCK_INFO     *GpeBlock,
 130     void                    *Context);
 131
 132
 133 /******************************************************************************
 134  *
 135  * FUNCTION:    AcpiHwGetGpeRegisterBit
 136  *
 137  * PARAMETERS:  GpeEventInfo        - Info block for the GPE
 138  *              GpeRegisterInfo     - Info block for the GPE register
 139  *
 140  * RETURN:      Register mask with a one in the GPE bit position
 141  *
 142  * DESCRIPTION: Compute the register mask for this GPE. One bit is set in the
 143  *              correct position for the input GPE.
 144  *
 145  ******************************************************************************/
 146
 147 UINT32
 148 AcpiHwGetGpeRegisterBit (
 149     ACPI_GPE_EVENT_INFO     *GpeEventInfo,
 150     ACPI_GPE_REGISTER_INFO  *GpeRegisterInfo)
 151 {
 152
 153     return ((UINT32) 1 <<
 154         (GpeEventInfo->GpeNumber - GpeRegisterInfo->BaseGpeNumber));
 155 }
 156
 157
 158 /******************************************************************************
 159  *
 160  * FUNCTION:    AcpiHwLowSetGpe
 161  *
 162  * PARAMETERS:  GpeEventInfo        - Info block for the GPE to be disabled
 163  *              Action              - Enable or disable
 164  *
 165  * RETURN:      Status
 166  *
 167  * DESCRIPTION: Enable or disable a single GPE in the parent enable register.
 168  *
 169  ******************************************************************************/
 170
 171 ACPI_STATUS
 172 AcpiHwLowSetGpe (
 173     ACPI_GPE_EVENT_INFO     *GpeEventInfo,
 174     UINT32                  Action)
 175 {
 176     ACPI_GPE_REGISTER_INFO  *GpeRegisterInfo;
 177     ACPI_STATUS             Status;
 178     UINT32                  EnableMask;
 179     UINT32                  RegisterBit;
 180
 181
 182     ACPI_FUNCTION_ENTRY ();
 183
 184
 185     /* Get the info block for the entire GPE register */
 186
 187     GpeRegisterInfo = GpeEventInfo->RegisterInfo;
 188     if (!GpeRegisterInfo)
 189     {
 190         return (AE_NOT_EXIST);
 191     }
 192
 193     /* Get current value of the enable register that contains this GPE */
 194
 195     Status = AcpiHwRead (&EnableMask, &GpeRegisterInfo->EnableAddress);
 196     if (ACPI_FAILURE (Status))
 197     {
 198         return (Status);
 199     }
 200
 201     /* Set or clear just the bit that corresponds to this GPE */
 202
 203     RegisterBit = AcpiHwGetGpeRegisterBit (GpeEventInfo, GpeRegisterInfo);
 204     switch (Action)
 205     {
 206     case ACPI_GPE_CONDITIONAL_ENABLE:
 207
 208         /* Only enable if the EnableForRun bit is set */
 209
 210         if (!(RegisterBit & GpeRegisterInfo->EnableForRun))
 211         {
 212             return (AE_BAD_PARAMETER);
 213         }
 214
 215         /*lint -fallthrough */
 216
 217     case ACPI_GPE_ENABLE:
 218         ACPI_SET_BIT (EnableMask, RegisterBit);
 219         break;
 220
 221     case ACPI_GPE_DISABLE:
 222         ACPI_CLEAR_BIT (EnableMask, RegisterBit);
 223         break;
 224
 225     default:
 226         ACPI_ERROR ((AE_INFO, "Invalid GPE Action, %u\n", Action));
 227         return (AE_BAD_PARAMETER);
 228     }
 229
 230     /* Write the updated enable mask */
 231
 232     Status = AcpiHwWrite (EnableMask, &GpeRegisterInfo->EnableAddress);
 233     return (Status);
 234 }
 235
 236
 237 /******************************************************************************
 238  *
 239  * FUNCTION:    AcpiHwClearGpe
 240  *
 241  * PARAMETERS:  GpeEventInfo        - Info block for the GPE to be cleared
 242  *
 243  * RETURN:      Status
 244  *
 245  * DESCRIPTION: Clear the status bit for a single GPE.
 246  *
 247  ******************************************************************************/
 248
 249 ACPI_STATUS
 250 AcpiHwClearGpe (
 251     ACPI_GPE_EVENT_INFO     *GpeEventInfo)
 252 {
 253     ACPI_GPE_REGISTER_INFO  *GpeRegisterInfo;
 254     ACPI_STATUS             Status;
 255     UINT32                  RegisterBit;
 256
 257
 258     ACPI_FUNCTION_ENTRY ();
 259
 260     /* Get the info block for the entire GPE register */
 261
 262     GpeRegisterInfo = GpeEventInfo->RegisterInfo;
 263     if (!GpeRegisterInfo)
 264     {
 265         return (AE_NOT_EXIST);
 266     }
 267
 268     /*
 269      * Write a one to the appropriate bit in the status register to
 270      * clear this GPE.
 271      */
 272     RegisterBit = AcpiHwGetGpeRegisterBit (GpeEventInfo, GpeRegisterInfo);
 273
 274     Status = AcpiHwWrite (RegisterBit,
 275                     &GpeRegisterInfo->StatusAddress);
 276
 277     return (Status);
 278 }
 279
 280
 281 /******************************************************************************
 282  *
 283  * FUNCTION:    AcpiHwGetGpeStatus
 284  *
 285  * PARAMETERS:  GpeEventInfo        - Info block for the GPE to queried
 286  *              EventStatus         - Where the GPE status is returned
 287  *
 288  * RETURN:      Status
 289  *
 290  * DESCRIPTION: Return the status of a single GPE.
 291  *
 292  ******************************************************************************/
 293
 294 ACPI_STATUS
 295 AcpiHwGetGpeStatus (
 296     ACPI_GPE_EVENT_INFO     *GpeEventInfo,
 297     ACPI_EVENT_STATUS       *EventStatus)
 298 {
 299     UINT32                  InByte;
 300     UINT32                  RegisterBit;
 301     ACPI_GPE_REGISTER_INFO  *GpeRegisterInfo;
 302     ACPI_EVENT_STATUS       LocalEventStatus = 0;
 303     ACPI_STATUS             Status;
 304
 305
 306     ACPI_FUNCTION_ENTRY ();
 307
 308
 309     if (!EventStatus)
 310     {
 311         return (AE_BAD_PARAMETER);
 312     }
 313
 314     /* Get the info block for the entire GPE register */
 315
 316     GpeRegisterInfo = GpeEventInfo->RegisterInfo;
 317
 318     /* Get the register bitmask for this GPE */
 319
 320     RegisterBit = AcpiHwGetGpeRegisterBit (GpeEventInfo, GpeRegisterInfo);
 321
 322     /* GPE currently enabled? (enabled for runtime?) */
 323
 324     if (RegisterBit & GpeRegisterInfo->EnableForRun)
 325     {
 326         LocalEventStatus |= ACPI_EVENT_FLAG_ENABLED;
 327     }
 328
 329     /* GPE enabled for wake? */
 330
 331     if (RegisterBit & GpeRegisterInfo->EnableForWake)
 332     {
 333         LocalEventStatus |= ACPI_EVENT_FLAG_WAKE_ENABLED;
 334     }
 335
 336     /* GPE currently active (status bit == 1)? */
 337
 338     Status = AcpiHwRead (&InByte, &GpeRegisterInfo->StatusAddress);
 339     if (ACPI_FAILURE (Status))
 340     {
 341         return (Status);
 342     }
 343
 344     if (RegisterBit & InByte)
 345     {
 346         LocalEventStatus |= ACPI_EVENT_FLAG_SET;
 347     }
 348
 349     /* Set return value */
 350
 351     (*EventStatus) = LocalEventStatus;
 352     return (AE_OK);
 353 }
 354
 355
 356 /******************************************************************************
 357  *
 358  * FUNCTION:    AcpiHwDisableGpeBlock
 359  *
 360  * PARAMETERS:  GpeXruptInfo        - GPE Interrupt info
 361  *              GpeBlock            - Gpe Block info
 362  *
 363  * RETURN:      Status
 364  *
 365  * DESCRIPTION: Disable all GPEs within a single GPE block
 366  *
 367  ******************************************************************************/
 368
 369 ACPI_STATUS
 370 AcpiHwDisableGpeBlock (
 371     ACPI_GPE_XRUPT_INFO     *GpeXruptInfo,
 372     ACPI_GPE_BLOCK_INFO     *GpeBlock,
 373     void                    *Context)
 374 {
 375     UINT32                  i;
 376     ACPI_STATUS             Status;
 377
 378
 379     /* Examine each GPE Register within the block */
 380
 381     for (i = 0; i < GpeBlock->RegisterCount; i++)
 382     {
 383         /* Disable all GPEs in this register */
 384
 385         Status = AcpiHwWrite (0x00, &GpeBlock->RegisterInfo[i].EnableAddress);
 386         if (ACPI_FAILURE (Status))
 387         {
 388             return (Status);
 389         }
 390     }
 391
 392     return (AE_OK);
 393 }
 394
 395
 396 /******************************************************************************
 397  *
 398  * FUNCTION:    AcpiHwClearGpeBlock
 399  *
 400  * PARAMETERS:  GpeXruptInfo        - GPE Interrupt info
 401  *              GpeBlock            - Gpe Block info
 402  *
 403  * RETURN:      Status
 404  *
 405  * DESCRIPTION: Clear status bits for all GPEs within a single GPE block
 406  *
 407  ******************************************************************************/
 408
 409 ACPI_STATUS
 410 AcpiHwClearGpeBlock (
 411     ACPI_GPE_XRUPT_INFO     *GpeXruptInfo,
 412     ACPI_GPE_BLOCK_INFO     *GpeBlock,
 413     void                    *Context)
 414 {
 415     UINT32                  i;
 416     ACPI_STATUS             Status;
 417
 418
 419     /* Examine each GPE Register within the block */
 420
 421     for (i = 0; i < GpeBlock->RegisterCount; i++)
 422     {
 423         /* Clear status on all GPEs in this register */
 424
 425         Status = AcpiHwWrite (0xFF, &GpeBlock->RegisterInfo[i].StatusAddress);
 426         if (ACPI_FAILURE (Status))
 427         {
 428             return (Status);
 429         }
 430     }
 431
 432     return (AE_OK);
 433 }
 434
 435
 436 /******************************************************************************
 437  *
 438  * FUNCTION:    AcpiHwEnableRuntimeGpeBlock
 439  *
 440  * PARAMETERS:  GpeXruptInfo        - GPE Interrupt info
 441  *              GpeBlock            - Gpe Block info
 442  *
 443  * RETURN:      Status
 444  *
 445  * DESCRIPTION: Enable all "runtime" GPEs within a single GPE block. Includes
 446  *              combination wake/run GPEs.
 447  *
 448  ******************************************************************************/
 449
 450 ACPI_STATUS
 451 AcpiHwEnableRuntimeGpeBlock (
 452     ACPI_GPE_XRUPT_INFO     *GpeXruptInfo,
 453     ACPI_GPE_BLOCK_INFO     *GpeBlock,
 454     void                    *Context)
 455 {
 456     UINT32                  i;
 457     ACPI_STATUS             Status;
 458
 459
 460     /* NOTE: assumes that all GPEs are currently disabled */
 461
 462     /* Examine each GPE Register within the block */
 463
 464     for (i = 0; i < GpeBlock->RegisterCount; i++)
 465     {
 466         if (!GpeBlock->RegisterInfo[i].EnableForRun)
 467         {
 468             continue;
 469         }
 470
 471         /* Enable all "runtime" GPEs in this register */
 472
 473         Status = AcpiHwWrite (GpeBlock->RegisterInfo[i].EnableForRun,
 474                     &GpeBlock->RegisterInfo[i].EnableAddress);
 475         if (ACPI_FAILURE (Status))
 476         {
 477             return (Status);
 478         }
 479     }
 480
 481     return (AE_OK);
 482 }
 483
 484
 485 /******************************************************************************
 486  *
 487  * FUNCTION:    AcpiHwEnableWakeupGpeBlock
 488  *
 489  * PARAMETERS:  GpeXruptInfo        - GPE Interrupt info
 490  *              GpeBlock            - Gpe Block info
 491  *
 492  * RETURN:      Status
 493  *
 494  * DESCRIPTION: Enable all "wake" GPEs within a single GPE block. Includes
 495  *              combination wake/run GPEs.
 496  *
 497  ******************************************************************************/
 498
 499 static ACPI_STATUS
 500 AcpiHwEnableWakeupGpeBlock (
 501     ACPI_GPE_XRUPT_INFO     *GpeXruptInfo,
 502     ACPI_GPE_BLOCK_INFO     *GpeBlock,
 503     void                    *Context)
 504 {
 505     UINT32                  i;
 506     ACPI_STATUS             Status;
 507
 508
 509     /* Examine each GPE Register within the block */
 510
 511     for (i = 0; i < GpeBlock->RegisterCount; i++)
 512     {
 513         if (!GpeBlock->RegisterInfo[i].EnableForWake)
 514         {
 515             continue;
 516         }
 517
 518         /* Enable all "wake" GPEs in this register */
 519
 520         Status = AcpiHwWrite (GpeBlock->RegisterInfo[i].EnableForWake,
 521                     &GpeBlock->RegisterInfo[i].EnableAddress);
 522         if (ACPI_FAILURE (Status))
 523         {
 524             return (Status);
 525         }
 526     }
 527
 528     return (AE_OK);
 529 }
 530
 531
 532 /******************************************************************************
 533  *
 534  * FUNCTION:    AcpiHwDisableAllGpes
 535  *
 536  * PARAMETERS:  None
 537  *
 538  * RETURN:      Status
 539  *
 540  * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 541  *
 542  ******************************************************************************/
 543
 544 ACPI_STATUS
 545 AcpiHwDisableAllGpes (
 546     void)
 547 {
 548     ACPI_STATUS             Status;
 549
 550
 551     ACPI_FUNCTION_TRACE (HwDisableAllGpes);
 552
 553
 554     Status = AcpiEvWalkGpeList (AcpiHwDisableGpeBlock, NULL);
 555     Status = AcpiEvWalkGpeList (AcpiHwClearGpeBlock, NULL);
 556     return_ACPI_STATUS (Status);
 557 }
 558
 559
 560 /******************************************************************************
 561  *
 562  * FUNCTION:    AcpiHwEnableAllRuntimeGpes
 563  *
 564  * PARAMETERS:  None
 565  *
 566  * RETURN:      Status
 567  *
 568  * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 569  *
 570  ******************************************************************************/
 571
 572 ACPI_STATUS
 573 AcpiHwEnableAllRuntimeGpes (
 574     void)
 575 {
 576     ACPI_STATUS             Status;
 577
 578
 579     ACPI_FUNCTION_TRACE (HwEnableAllRuntimeGpes);
 580
 581
 582     Status = AcpiEvWalkGpeList (AcpiHwEnableRuntimeGpeBlock, NULL);
 583     return_ACPI_STATUS (Status);
 584 }
 585
 586
 587 /******************************************************************************
 588  *
 589  * FUNCTION:    AcpiHwEnableAllWakeupGpes
 590  *
 591  * PARAMETERS:  None
 592  *
 593  * RETURN:      Status
 594  *
 595  * DESCRIPTION: Enable all "wakeup" GPEs, in all GPE blocks
 596  *
 597  ******************************************************************************/
 598
 599 ACPI_STATUS
 600 AcpiHwEnableAllWakeupGpes (
 601     void)
 602 {
 603     ACPI_STATUS             Status;
 604
 605
 606     ACPI_FUNCTION_TRACE (HwEnableAllWakeupGpes);
 607
 608
 609     Status = AcpiEvWalkGpeList (AcpiHwEnableWakeupGpeBlock, NULL);
 610     return_ACPI_STATUS (Status);
 611 }
 612