arch/all-pc/acpica/source/components/events/evgpeinit.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evgpeinit - System GPE initialization and update
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, 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
  45 #include "acpi.h"
  46 #include "accommon.h"
  47 #include "acevents.h"
  48 #include "acnamesp.h"
  49
  50 #define _COMPONENT          ACPI_EVENTS
  51         ACPI_MODULE_NAME    ("evgpeinit")
  52
  53 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
  54
  55 /*
  56  * Note: History of _PRW support in ACPICA
  57  *
  58  * Originally (2000 - 2010), the GPE initialization code performed a walk of
  59  * the entire namespace to execute the _PRW methods and detect all GPEs
  60  * capable of waking the system.
  61  *
  62  * As of 10/2010, the _PRW method execution has been removed since it is
  63  * actually unnecessary. The host OS must in fact execute all _PRW methods
  64  * in order to identify the device/power-resource dependencies. We now put
  65  * the onus on the host OS to identify the wake GPEs as part of this process
  66  * and to inform ACPICA of these GPEs via the AcpiSetupGpeForWake interface. This
  67  * not only reduces the complexity of the ACPICA initialization code, but in
  68  * some cases (on systems with very large namespaces) it should reduce the
  69  * kernel boot time as well.
  70  */
  71
  72 /*******************************************************************************
  73  *
  74  * FUNCTION:    AcpiEvGpeInitialize
  75  *
  76  * PARAMETERS:  None
  77  *
  78  * RETURN:      Status
  79  *
  80  * DESCRIPTION: Initialize the GPE data structures and the FADT GPE 0/1 blocks
  81  *
  82  ******************************************************************************/
  83
  84 ACPI_STATUS
  85 AcpiEvGpeInitialize (
  86     void)
  87 {
  88     UINT32                  RegisterCount0 = 0;
  89     UINT32                  RegisterCount1 = 0;
  90     UINT32                  GpeNumberMax = 0;
  91     ACPI_STATUS             Status;
  92
  93
  94     ACPI_FUNCTION_TRACE (EvGpeInitialize);
  95
  96
  97     ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT,
  98         "Initializing General Purpose Events (GPEs):\n"));
  99
 100     Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
 101     if (ACPI_FAILURE (Status))
 102     {
 103         return_ACPI_STATUS (Status);
 104     }
 105
 106     /*
 107      * Initialize the GPE Block(s) defined in the FADT
 108      *
 109      * Why the GPE register block lengths are divided by 2:  From the ACPI
 110      * Spec, section "General-Purpose Event Registers", we have:
 111      *
 112      * "Each register block contains two registers of equal length
 113      *  GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
 114      *  GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
 115      *  The length of the GPE1_STS and GPE1_EN registers is equal to
 116      *  half the GPE1_LEN. If a generic register block is not supported
 117      *  then its respective block pointer and block length values in the
 118      *  FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
 119      *  to be the same size."
 120      */
 121
 122     /*
 123      * Determine the maximum GPE number for this machine.
 124      *
 125      * Note: both GPE0 and GPE1 are optional, and either can exist without
 126      * the other.
 127      *
 128      * If EITHER the register length OR the block address are zero, then that
 129      * particular block is not supported.
 130      */
 131     if (AcpiGbl_FADT.Gpe0BlockLength &&
 132         AcpiGbl_FADT.XGpe0Block.Address)
 133     {
 134         /* GPE block 0 exists (has both length and address > 0) */
 135
 136         RegisterCount0 = (UINT16) (AcpiGbl_FADT.Gpe0BlockLength / 2);
 137         GpeNumberMax = (RegisterCount0 * ACPI_GPE_REGISTER_WIDTH) - 1;
 138
 139         /* Install GPE Block 0 */
 140
 141         Status = AcpiEvCreateGpeBlock (AcpiGbl_FadtGpeDevice,
 142                     &AcpiGbl_FADT.XGpe0Block, RegisterCount0, 0,
 143                     AcpiGbl_FADT.SciInterrupt, &AcpiGbl_GpeFadtBlocks[0]);
 144
 145         if (ACPI_FAILURE (Status))
 146         {
 147             ACPI_EXCEPTION ((AE_INFO, Status,
 148                 "Could not create GPE Block 0"));
 149         }
 150     }
 151
 152     if (AcpiGbl_FADT.Gpe1BlockLength &&
 153         AcpiGbl_FADT.XGpe1Block.Address)
 154     {
 155         /* GPE block 1 exists (has both length and address > 0) */
 156
 157         RegisterCount1 = (UINT16) (AcpiGbl_FADT.Gpe1BlockLength / 2);
 158
 159         /* Check for GPE0/GPE1 overlap (if both banks exist) */
 160
 161         if ((RegisterCount0) &&
 162             (GpeNumberMax >= AcpiGbl_FADT.Gpe1Base))
 163         {
 164             ACPI_ERROR ((AE_INFO,
 165                 "GPE0 block (GPE 0 to %u) overlaps the GPE1 block "
 166                 "(GPE %u to %u) - Ignoring GPE1",
 167                 GpeNumberMax, AcpiGbl_FADT.Gpe1Base,
 168                 AcpiGbl_FADT.Gpe1Base +
 169                 ((RegisterCount1 * ACPI_GPE_REGISTER_WIDTH) - 1)));
 170
 171             /* Ignore GPE1 block by setting the register count to zero */
 172
 173             RegisterCount1 = 0;
 174         }
 175         else
 176         {
 177             /* Install GPE Block 1 */
 178
 179             Status = AcpiEvCreateGpeBlock (AcpiGbl_FadtGpeDevice,
 180                         &AcpiGbl_FADT.XGpe1Block, RegisterCount1,
 181                         AcpiGbl_FADT.Gpe1Base,
 182                         AcpiGbl_FADT.SciInterrupt, &AcpiGbl_GpeFadtBlocks[1]);
 183
 184             if (ACPI_FAILURE (Status))
 185             {
 186                 ACPI_EXCEPTION ((AE_INFO, Status,
 187                     "Could not create GPE Block 1"));
 188             }
 189
 190             /*
 191              * GPE0 and GPE1 do not have to be contiguous in the GPE number
 192              * space. However, GPE0 always starts at GPE number zero.
 193              */
 194             GpeNumberMax = AcpiGbl_FADT.Gpe1Base +
 195                             ((RegisterCount1 * ACPI_GPE_REGISTER_WIDTH) - 1);
 196         }
 197     }
 198
 199     /* Exit if there are no GPE registers */
 200
 201     if ((RegisterCount0 + RegisterCount1) == 0)
 202     {
 203         /* GPEs are not required by ACPI, this is OK */
 204
 205         ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
 206             "There are no GPE blocks defined in the FADT\n"));
 207         Status = AE_OK;
 208         goto Cleanup;
 209     }
 210
 211
 212 Cleanup:
 213     (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
 214     return_ACPI_STATUS (AE_OK);
 215 }
 216
 217
 218 /*******************************************************************************
 219  *
 220  * FUNCTION:    AcpiEvUpdateGpes
 221  *
 222  * PARAMETERS:  TableOwnerId        - ID of the newly-loaded ACPI table
 223  *
 224  * RETURN:      None
 225  *
 226  * DESCRIPTION: Check for new GPE methods (_Lxx/_Exx) made available as a
 227  *              result of a Load() or LoadTable() operation. If new GPE
 228  *              methods have been installed, register the new methods.
 229  *
 230  ******************************************************************************/
 231
 232 void
 233 AcpiEvUpdateGpes (
 234     ACPI_OWNER_ID           TableOwnerId)
 235 {
 236     ACPI_GPE_XRUPT_INFO     *GpeXruptInfo;
 237     ACPI_GPE_BLOCK_INFO     *GpeBlock;
 238     ACPI_GPE_WALK_INFO      WalkInfo;
 239     ACPI_STATUS             Status = AE_OK;
 240
 241
 242     /*
 243      * Find any _Lxx/_Exx GPE methods that have just been loaded.
 244      *
 245      * Any GPEs that correspond to new _Lxx/_Exx methods are immediately
 246      * enabled.
 247      *
 248      * Examine the namespace underneath each GpeDevice within the
 249      * GpeBlock lists.
 250      */
 251     Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
 252     if (ACPI_FAILURE (Status))
 253     {
 254         return;
 255     }
 256
 257     WalkInfo.Count = 0;
 258     WalkInfo.OwnerId = TableOwnerId;
 259     WalkInfo.ExecuteByOwnerId = TRUE;
 260
 261     /* Walk the interrupt level descriptor list */
 262
 263     GpeXruptInfo = AcpiGbl_GpeXruptListHead;
 264     while (GpeXruptInfo)
 265     {
 266         /* Walk all Gpe Blocks attached to this interrupt level */
 267
 268         GpeBlock = GpeXruptInfo->GpeBlockListHead;
 269         while (GpeBlock)
 270         {
 271             WalkInfo.GpeBlock = GpeBlock;
 272             WalkInfo.GpeDevice = GpeBlock->Node;
 273
 274             Status = AcpiNsWalkNamespace (ACPI_TYPE_METHOD,
 275                         WalkInfo.GpeDevice, ACPI_UINT32_MAX,
 276                         ACPI_NS_WALK_NO_UNLOCK, AcpiEvMatchGpeMethod,
 277                         NULL, &WalkInfo, NULL);
 278             if (ACPI_FAILURE (Status))
 279             {
 280                 ACPI_EXCEPTION ((AE_INFO, Status,
 281                     "While decoding _Lxx/_Exx methods"));
 282             }
 283
 284             GpeBlock = GpeBlock->Next;
 285         }
 286
 287         GpeXruptInfo = GpeXruptInfo->Next;
 288     }
 289
 290     if (WalkInfo.Count)
 291     {
 292         ACPI_INFO ((AE_INFO, "Enabled %u new GPEs", WalkInfo.Count));
 293     }
 294
 295     (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
 296     return;
 297 }
 298
 299
 300 /*******************************************************************************
 301  *
 302  * FUNCTION:    AcpiEvMatchGpeMethod
 303  *
 304  * PARAMETERS:  Callback from WalkNamespace
 305  *
 306  * RETURN:      Status
 307  *
 308  * DESCRIPTION: Called from AcpiWalkNamespace. Expects each object to be a
 309  *              control method under the _GPE portion of the namespace.
 310  *              Extract the name and GPE type from the object, saving this
 311  *              information for quick lookup during GPE dispatch. Allows a
 312  *              per-OwnerId evaluation if ExecuteByOwnerId is TRUE in the
 313  *              WalkInfo parameter block.
 314  *
 315  *              The name of each GPE control method is of the form:
 316  *              "_Lxx" or "_Exx", where:
 317  *                  L      - means that the GPE is level triggered
 318  *                  E      - means that the GPE is edge triggered
 319  *                  xx     - is the GPE number [in HEX]
 320  *
 321  * If WalkInfo->ExecuteByOwnerId is TRUE, we only execute examine GPE methods
 322  * with that owner.
 323  *
 324  ******************************************************************************/
 325
 326 ACPI_STATUS
 327 AcpiEvMatchGpeMethod (
 328     ACPI_HANDLE             ObjHandle,
 329     UINT32                  Level,
 330     void                    *Context,
 331     void                    **ReturnValue)
 332 {
 333     ACPI_NAMESPACE_NODE     *MethodNode = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjHandle);
 334     ACPI_GPE_WALK_INFO      *WalkInfo = ACPI_CAST_PTR (ACPI_GPE_WALK_INFO, Context);
 335     ACPI_GPE_EVENT_INFO     *GpeEventInfo;
 336     UINT32                  GpeNumber;
 337     char                    Name[ACPI_NAME_SIZE + 1];
 338     UINT8                   Type;
 339
 340
 341     ACPI_FUNCTION_TRACE (EvMatchGpeMethod);
 342
 343
 344     /* Check if requested OwnerId matches this OwnerId */
 345
 346     if ((WalkInfo->ExecuteByOwnerId) &&
 347         (MethodNode->OwnerId != WalkInfo->OwnerId))
 348     {
 349         return_ACPI_STATUS (AE_OK);
 350     }
 351
 352     /*
 353      * Match and decode the _Lxx and _Exx GPE method names
 354      *
 355      * 1) Extract the method name and null terminate it
 356      */
 357     ACPI_MOVE_32_TO_32 (Name, &MethodNode->Name.Integer);
 358     Name[ACPI_NAME_SIZE] = 0;
 359
 360     /* 2) Name must begin with an underscore */
 361
 362     if (Name[0] != '_')
 363     {
 364         return_ACPI_STATUS (AE_OK); /* Ignore this method */
 365     }
 366
 367     /*
 368      * 3) Edge/Level determination is based on the 2nd character
 369      *    of the method name
 370      */
 371     switch (Name[1])
 372     {
 373     case 'L':
 374
 375         Type = ACPI_GPE_LEVEL_TRIGGERED;
 376         break;
 377
 378     case 'E':
 379
 380         Type = ACPI_GPE_EDGE_TRIGGERED;
 381         break;
 382
 383     default:
 384
 385         /* Unknown method type, just ignore it */
 386
 387         ACPI_DEBUG_PRINT ((ACPI_DB_LOAD,
 388             "Ignoring unknown GPE method type: %s "
 389             "(name not of form _Lxx or _Exx)", Name));
 390         return_ACPI_STATUS (AE_OK);
 391     }
 392
 393     /* 4) The last two characters of the name are the hex GPE Number */
 394
 395     GpeNumber = ACPI_STRTOUL (&Name[2], NULL, 16);
 396     if (GpeNumber == ACPI_UINT32_MAX)
 397     {
 398         /* Conversion failed; invalid method, just ignore it */
 399
 400         ACPI_DEBUG_PRINT ((ACPI_DB_LOAD,
 401             "Could not extract GPE number from name: %s "
 402             "(name is not of form _Lxx or _Exx)", Name));
 403         return_ACPI_STATUS (AE_OK);
 404     }
 405
 406     /* Ensure that we have a valid GPE number for this GPE block */
 407
 408     GpeEventInfo = AcpiEvLowGetGpeInfo (GpeNumber, WalkInfo->GpeBlock);
 409     if (!GpeEventInfo)
 410     {
 411         /*
 412          * This GpeNumber is not valid for this GPE block, just ignore it.
 413          * However, it may be valid for a different GPE block, since GPE0
 414          * and GPE1 methods both appear under \_GPE.
 415          */
 416         return_ACPI_STATUS (AE_OK);
 417     }
 418
 419     if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) ==
 420             ACPI_GPE_DISPATCH_HANDLER)
 421     {
 422         /* If there is already a handler, ignore this GPE method */
 423
 424         return_ACPI_STATUS (AE_OK);
 425     }
 426
 427     if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) ==
 428             ACPI_GPE_DISPATCH_METHOD)
 429     {
 430         /*
 431          * If there is already a method, ignore this method. But check
 432          * for a type mismatch (if both the _Lxx AND _Exx exist)
 433          */
 434         if (Type != (GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK))
 435         {
 436             ACPI_ERROR ((AE_INFO,
 437                 "For GPE 0x%.2X, found both _L%2.2X and _E%2.2X methods",
 438                 GpeNumber, GpeNumber, GpeNumber));
 439         }
 440         return_ACPI_STATUS (AE_OK);
 441     }
 442
 443     /*
 444      * Add the GPE information from above to the GpeEventInfo block for
 445      * use during dispatch of this GPE.
 446      */
 447     GpeEventInfo->Flags &= ~(ACPI_GPE_DISPATCH_MASK);
 448     GpeEventInfo->Flags |= (UINT8) (Type | ACPI_GPE_DISPATCH_METHOD);
 449     GpeEventInfo->Dispatch.MethodNode = MethodNode;
 450
 451     ACPI_DEBUG_PRINT ((ACPI_DB_LOAD,
 452         "Registered GPE method %s as GPE number 0x%.2X\n",
 453         Name, GpeNumber));
 454     return_ACPI_STATUS (AE_OK);
 455 }
 456
 457 #endif /* !ACPI_REDUCED_HARDWARE */