reactos/drivers/bus/acpi/acpica/events/evgpeinit.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evgpeinit - System GPE initialization and update
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2016, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include "acpi.h"
  45 #include "accommon.h"
  46 #include "acevents.h"
  47 #include "acnamesp.h"
  48
  49 #define _COMPONENT          ACPI_EVENTS
  50         ACPI_MODULE_NAME    ("evgpeinit")
  51
  52 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
  53
  54 /*
  55  * Note: History of _PRW support in ACPICA
  56  *
  57  * Originally (2000 - 2010), the GPE initialization code performed a walk of
  58  * the entire namespace to execute the _PRW methods and detect all GPEs
  59  * capable of waking the system.
  60  *
  61  * As of 10/2010, the _PRW method execution has been removed since it is
  62  * actually unnecessary. The host OS must in fact execute all _PRW methods
  63  * in order to identify the device/power-resource dependencies. We now put
  64  * the onus on the host OS to identify the wake GPEs as part of this process
  65  * and to inform ACPICA of these GPEs via the AcpiSetupGpeForWake interface. This
  66  * not only reduces the complexity of the ACPICA initialization code, but in
  67  * some cases (on systems with very large namespaces) it should reduce the
  68  * kernel boot time as well.
  69  */
  70
  71 /*******************************************************************************
  72  *
  73  * FUNCTION:    AcpiEvGpeInitialize
  74  *
  75  * PARAMETERS:  None
  76  *
  77  * RETURN:      Status
  78  *
  79  * DESCRIPTION: Initialize the GPE data structures and the FADT GPE 0/1 blocks
  80  *
  81  ******************************************************************************/
  82
  83 ACPI_STATUS
  84 AcpiEvGpeInitialize (
  85     void)
  86 {
  87     UINT32                  RegisterCount0 = 0;
  88     UINT32                  RegisterCount1 = 0;
  89     UINT32                  GpeNumberMax = 0;
  90     ACPI_STATUS             Status;
  91
  92
  93     ACPI_FUNCTION_TRACE (EvGpeInitialize);
  94
  95
  96     ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT,
  97         "Initializing General Purpose Events (GPEs):\n"));
  98
  99     Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
 100     if (ACPI_FAILURE (Status))
 101     {
 102         return_ACPI_STATUS (Status);
 103     }
 104
 105     /*
 106      * Initialize the GPE Block(s) defined in the FADT
 107      *
 108      * Why the GPE register block lengths are divided by 2:  From the ACPI
 109      * Spec, section "General-Purpose Event Registers", we have:
 110      *
 111      * "Each register block contains two registers of equal length
 112      *  GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
 113      *  GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
 114      *  The length of the GPE1_STS and GPE1_EN registers is equal to
 115      *  half the GPE1_LEN. If a generic register block is not supported
 116      *  then its respective block pointer and block length values in the
 117      *  FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
 118      *  to be the same size."
 119      */
 120
 121     /*
 122      * Determine the maximum GPE number for this machine.
 123      *
 124      * Note: both GPE0 and GPE1 are optional, and either can exist without
 125      * the other.
 126      *
 127      * If EITHER the register length OR the block address are zero, then that
 128      * particular block is not supported.
 129      */
 130     if (AcpiGbl_FADT.Gpe0BlockLength &&
 131         AcpiGbl_FADT.XGpe0Block.Address)
 132     {
 133         /* GPE block 0 exists (has both length and address > 0) */
 134
 135         RegisterCount0 = (UINT16) (AcpiGbl_FADT.Gpe0BlockLength / 2);
 136         GpeNumberMax = (RegisterCount0 * ACPI_GPE_REGISTER_WIDTH) - 1;
 137
 138         /* Install GPE Block 0 */
 139
 140         Status = AcpiEvCreateGpeBlock (AcpiGbl_FadtGpeDevice,
 141             AcpiGbl_FADT.XGpe0Block.Address,
 142             AcpiGbl_FADT.XGpe0Block.SpaceId,
 143             RegisterCount0, 0,
 144             AcpiGbl_FADT.SciInterrupt, &AcpiGbl_GpeFadtBlocks[0]);
 145
 146         if (ACPI_FAILURE (Status))
 147         {
 148             ACPI_EXCEPTION ((AE_INFO, Status,
 149                 "Could not create GPE Block 0"));
 150         }
 151     }
 152
 153     if (AcpiGbl_FADT.Gpe1BlockLength &&
 154         AcpiGbl_FADT.XGpe1Block.Address)
 155     {
 156         /* GPE block 1 exists (has both length and address > 0) */
 157
 158         RegisterCount1 = (UINT16) (AcpiGbl_FADT.Gpe1BlockLength / 2);
 159
 160         /* Check for GPE0/GPE1 overlap (if both banks exist) */
 161
 162         if ((RegisterCount0) &&
 163             (GpeNumberMax >= AcpiGbl_FADT.Gpe1Base))
 164         {
 165             ACPI_ERROR ((AE_INFO,
 166                 "GPE0 block (GPE 0 to %u) overlaps the GPE1 block "
 167                 "(GPE %u to %u) - Ignoring GPE1",
 168                 GpeNumberMax, AcpiGbl_FADT.Gpe1Base,
 169                 AcpiGbl_FADT.Gpe1Base +
 170                 ((RegisterCount1 * ACPI_GPE_REGISTER_WIDTH) - 1)));
 171
 172             /* Ignore GPE1 block by setting the register count to zero */
 173
 174             RegisterCount1 = 0;
 175         }
 176         else
 177         {
 178             /* Install GPE Block 1 */
 179
 180             Status = AcpiEvCreateGpeBlock (AcpiGbl_FadtGpeDevice,
 181                 AcpiGbl_FADT.XGpe1Block.Address,
 182                 AcpiGbl_FADT.XGpe1Block.SpaceId,
 183                 RegisterCount1,
 184                 AcpiGbl_FADT.Gpe1Base,
 185                 AcpiGbl_FADT.SciInterrupt, &AcpiGbl_GpeFadtBlocks[1]);
 186
 187             if (ACPI_FAILURE (Status))
 188             {
 189                 ACPI_EXCEPTION ((AE_INFO, Status,
 190                     "Could not create GPE Block 1"));
 191             }
 192
 193             /*
 194              * GPE0 and GPE1 do not have to be contiguous in the GPE number
 195              * space. However, GPE0 always starts at GPE number zero.
 196              */
 197             GpeNumberMax = AcpiGbl_FADT.Gpe1Base +
 198                 ((RegisterCount1 * ACPI_GPE_REGISTER_WIDTH) - 1);
 199         }
 200     }
 201
 202     /* Exit if there are no GPE registers */
 203
 204     if ((RegisterCount0 + RegisterCount1) == 0)
 205     {
 206         /* GPEs are not required by ACPI, this is OK */
 207
 208         ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
 209             "There are no GPE blocks defined in the FADT\n"));
 210         Status = AE_OK;
 211         goto Cleanup;
 212     }
 213
 214
 215 Cleanup:
 216     (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
 217     return_ACPI_STATUS (AE_OK);
 218 }
 219
 220
 221 /*******************************************************************************
 222  *
 223  * FUNCTION:    AcpiEvUpdateGpes
 224  *
 225  * PARAMETERS:  TableOwnerId        - ID of the newly-loaded ACPI table
 226  *
 227  * RETURN:      None
 228  *
 229  * DESCRIPTION: Check for new GPE methods (_Lxx/_Exx) made available as a
 230  *              result of a Load() or LoadTable() operation. If new GPE
 231  *              methods have been installed, register the new methods.
 232  *
 233  ******************************************************************************/
 234
 235 void
 236 AcpiEvUpdateGpes (
 237     ACPI_OWNER_ID           TableOwnerId)
 238 {
 239     ACPI_GPE_XRUPT_INFO     *GpeXruptInfo;
 240     ACPI_GPE_BLOCK_INFO     *GpeBlock;
 241     ACPI_GPE_WALK_INFO      WalkInfo;
 242     ACPI_STATUS             Status = AE_OK;
 243
 244
 245     /*
 246      * Find any _Lxx/_Exx GPE methods that have just been loaded.
 247      *
 248      * Any GPEs that correspond to new _Lxx/_Exx methods are immediately
 249      * enabled.
 250      *
 251      * Examine the namespace underneath each GpeDevice within the
 252      * GpeBlock lists.
 253      */
 254     Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
 255     if (ACPI_FAILURE (Status))
 256     {
 257         return;
 258     }
 259
 260     WalkInfo.Count = 0;
 261     WalkInfo.OwnerId = TableOwnerId;
 262     WalkInfo.ExecuteByOwnerId = TRUE;
 263
 264     /* Walk the interrupt level descriptor list */
 265
 266     GpeXruptInfo = AcpiGbl_GpeXruptListHead;
 267     while (GpeXruptInfo)
 268     {
 269         /* Walk all Gpe Blocks attached to this interrupt level */
 270
 271         GpeBlock = GpeXruptInfo->GpeBlockListHead;
 272         while (GpeBlock)
 273         {
 274             WalkInfo.GpeBlock = GpeBlock;
 275             WalkInfo.GpeDevice = GpeBlock->Node;
 276
 277             Status = AcpiNsWalkNamespace (ACPI_TYPE_METHOD,
 278                 WalkInfo.GpeDevice, ACPI_UINT32_MAX,
 279                 ACPI_NS_WALK_NO_UNLOCK, AcpiEvMatchGpeMethod,
 280                 NULL, &WalkInfo, NULL);
 281             if (ACPI_FAILURE (Status))
 282             {
 283                 ACPI_EXCEPTION ((AE_INFO, Status,
 284                     "While decoding _Lxx/_Exx methods"));
 285             }
 286
 287             GpeBlock = GpeBlock->Next;
 288         }
 289
 290         GpeXruptInfo = GpeXruptInfo->Next;
 291     }
 292
 293     if (WalkInfo.Count)
 294     {
 295         ACPI_INFO (("Enabled %u new GPEs", WalkInfo.Count));
 296     }
 297
 298     (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
 299     return;
 300 }
 301
 302
 303 /*******************************************************************************
 304  *
 305  * FUNCTION:    AcpiEvMatchGpeMethod
 306  *
 307  * PARAMETERS:  Callback from WalkNamespace
 308  *
 309  * RETURN:      Status
 310  *
 311  * DESCRIPTION: Called from AcpiWalkNamespace. Expects each object to be a
 312  *              control method under the _GPE portion of the namespace.
 313  *              Extract the name and GPE type from the object, saving this
 314  *              information for quick lookup during GPE dispatch. Allows a
 315  *              per-OwnerId evaluation if ExecuteByOwnerId is TRUE in the
 316  *              WalkInfo parameter block.
 317  *
 318  *              The name of each GPE control method is of the form:
 319  *              "_Lxx" or "_Exx", where:
 320  *                  L      - means that the GPE is level triggered
 321  *                  E      - means that the GPE is edge triggered
 322  *                  xx     - is the GPE number [in HEX]
 323  *
 324  * If WalkInfo->ExecuteByOwnerId is TRUE, we only execute examine GPE methods
 325  * with that owner.
 326  *
 327  ******************************************************************************/
 328
 329 ACPI_STATUS
 330 AcpiEvMatchGpeMethod (
 331     ACPI_HANDLE             ObjHandle,
 332     UINT32                  Level,
 333     void                    *Context,
 334     void                    **ReturnValue)
 335 {
 336     ACPI_NAMESPACE_NODE     *MethodNode = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjHandle);
 337     ACPI_GPE_WALK_INFO      *WalkInfo = ACPI_CAST_PTR (ACPI_GPE_WALK_INFO, Context);
 338     ACPI_GPE_EVENT_INFO     *GpeEventInfo;
 339     ACPI_STATUS             Status;
 340     UINT32                  GpeNumber;
 341     UINT8                   TempGpeNumber;
 342     char                    Name[ACPI_NAME_SIZE + 1];
 343     UINT8                   Type;
 344
 345
 346     ACPI_FUNCTION_TRACE (EvMatchGpeMethod);
 347
 348
 349     /* Check if requested OwnerId matches this OwnerId */
 350
 351     if ((WalkInfo->ExecuteByOwnerId) &&
 352         (MethodNode->OwnerId != WalkInfo->OwnerId))
 353     {
 354         return_ACPI_STATUS (AE_OK);
 355     }
 356
 357     /*
 358      * Match and decode the _Lxx and _Exx GPE method names
 359      *
 360      * 1) Extract the method name and null terminate it
 361      */
 362     ACPI_MOVE_32_TO_32 (Name, &MethodNode->Name.Integer);
 363     Name[ACPI_NAME_SIZE] = 0;
 364
 365     /* 2) Name must begin with an underscore */
 366
 367     if (Name[0] != '_')
 368     {
 369         return_ACPI_STATUS (AE_OK); /* Ignore this method */
 370     }
 371
 372     /*
 373      * 3) Edge/Level determination is based on the 2nd character
 374      *    of the method name
 375      */
 376     switch (Name[1])
 377     {
 378     case 'L':
 379
 380         Type = ACPI_GPE_LEVEL_TRIGGERED;
 381         break;
 382
 383     case 'E':
 384
 385         Type = ACPI_GPE_EDGE_TRIGGERED;
 386         break;
 387
 388     default:
 389
 390         /* Unknown method type, just ignore it */
 391
 392         ACPI_DEBUG_PRINT ((ACPI_DB_LOAD,
 393             "Ignoring unknown GPE method type: %s "
 394             "(name not of form _Lxx or _Exx)", Name));
 395         return_ACPI_STATUS (AE_OK);
 396     }
 397
 398     /* 4) The last two characters of the name are the hex GPE Number */
 399
 400     Status = AcpiUtAsciiToHexByte (&Name[2], &TempGpeNumber);
 401     if (ACPI_FAILURE (Status))
 402     {
 403         /* Conversion failed; invalid method, just ignore it */
 404
 405         ACPI_DEBUG_PRINT ((ACPI_DB_LOAD,
 406             "Could not extract GPE number from name: %s "
 407             "(name is not of form _Lxx or _Exx)", Name));
 408         return_ACPI_STATUS (AE_OK);
 409     }
 410
 411     /* Ensure that we have a valid GPE number for this GPE block */
 412
 413     GpeNumber = (UINT32) TempGpeNumber;
 414     GpeEventInfo = AcpiEvLowGetGpeInfo (GpeNumber, WalkInfo->GpeBlock);
 415     if (!GpeEventInfo)
 416     {
 417         /*
 418          * This GpeNumber is not valid for this GPE block, just ignore it.
 419          * However, it may be valid for a different GPE block, since GPE0
 420          * and GPE1 methods both appear under \_GPE.
 421          */
 422         return_ACPI_STATUS (AE_OK);
 423     }
 424
 425     if ((ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) ==
 426             ACPI_GPE_DISPATCH_HANDLER) ||
 427         (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) ==
 428             ACPI_GPE_DISPATCH_RAW_HANDLER))
 429     {
 430         /* If there is already a handler, ignore this GPE method */
 431
 432         return_ACPI_STATUS (AE_OK);
 433     }
 434
 435     if (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) ==
 436         ACPI_GPE_DISPATCH_METHOD)
 437     {
 438         /*
 439          * If there is already a method, ignore this method. But check
 440          * for a type mismatch (if both the _Lxx AND _Exx exist)
 441          */
 442         if (Type != (GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK))
 443         {
 444             ACPI_ERROR ((AE_INFO,
 445                 "For GPE 0x%.2X, found both _L%2.2X and _E%2.2X methods",
 446                 GpeNumber, GpeNumber, GpeNumber));
 447         }
 448         return_ACPI_STATUS (AE_OK);
 449     }
 450
 451     /* Disable the GPE in case it's been enabled already. */
 452
 453     (void) AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE);
 454
 455     /*
 456      * Add the GPE information from above to the GpeEventInfo block for
 457      * use during dispatch of this GPE.
 458      */
 459     GpeEventInfo->Flags &= ~(ACPI_GPE_DISPATCH_MASK);
 460     GpeEventInfo->Flags |= (UINT8) (Type | ACPI_GPE_DISPATCH_METHOD);
 461     GpeEventInfo->Dispatch.MethodNode = MethodNode;
 462
 463     ACPI_DEBUG_PRINT ((ACPI_DB_LOAD,
 464         "Registered GPE method %s as GPE number 0x%.2X\n",
 465         Name, GpeNumber));
 466     return_ACPI_STATUS (AE_OK);
 467 }
 468
 469 #endif /* !ACPI_REDUCED_HARDWARE */