drivers/acpi/acpica/evgpeinit.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evgpeinit - System GPE initialization and update
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2010, 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/acpi.h>
  45 #include "accommon.h"
  46 #include "acevents.h"
  47 #include "acnamesp.h"
  48 #include "acinterp.h"
  49
  50 #define _COMPONENT          ACPI_EVENTS
  51 ACPI_MODULE_NAME("evgpeinit")
  52
  53 /*******************************************************************************
  54  *
  55  * FUNCTION:    acpi_ev_gpe_initialize
  56  *
  57  * PARAMETERS:  None
  58  *
  59  * RETURN:      Status
  60  *
  61  * DESCRIPTION: Initialize the GPE data structures and the FADT GPE 0/1 blocks
  62  *
  63  ******************************************************************************/
  64 acpi_status acpi_ev_gpe_initialize(void)
  65 {
  66         u32 register_count0 = 0;
  67         u32 register_count1 = 0;
  68         u32 gpe_number_max = 0;
  69         acpi_status status;
  70
  71         ACPI_FUNCTION_TRACE(ev_gpe_initialize);
  72
  73         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
  74         if (ACPI_FAILURE(status)) {
  75                 return_ACPI_STATUS(status);
  76         }
  77
  78         /*
  79          * Initialize the GPE Block(s) defined in the FADT
  80          *
  81          * Why the GPE register block lengths are divided by 2:  From the ACPI
  82          * Spec, section "General-Purpose Event Registers", we have:
  83          *
  84          * "Each register block contains two registers of equal length
  85          *  GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
  86          *  GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
  87          *  The length of the GPE1_STS and GPE1_EN registers is equal to
  88          *  half the GPE1_LEN. If a generic register block is not supported
  89          *  then its respective block pointer and block length values in the
  90          *  FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
  91          *  to be the same size."
  92          */
  93
  94         /*
  95          * Determine the maximum GPE number for this machine.
  96          *
  97          * Note: both GPE0 and GPE1 are optional, and either can exist without
  98          * the other.
  99          *
 100          * If EITHER the register length OR the block address are zero, then that
 101          * particular block is not supported.
 102          */
 103         if (acpi_gbl_FADT.gpe0_block_length &&
 104             acpi_gbl_FADT.xgpe0_block.address) {
 105
 106                 /* GPE block 0 exists (has both length and address > 0) */
 107
 108                 register_count0 = (u16)(acpi_gbl_FADT.gpe0_block_length / 2);
 109
 110                 gpe_number_max =
 111                     (register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1;
 112
 113                 /* Install GPE Block 0 */
 114
 115                 status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
 116                                                   &acpi_gbl_FADT.xgpe0_block,
 117                                                   register_count0, 0,
 118                                                   acpi_gbl_FADT.sci_interrupt,
 119                                                   &acpi_gbl_gpe_fadt_blocks[0]);
 120
 121                 if (ACPI_FAILURE(status)) {
 122                         ACPI_EXCEPTION((AE_INFO, status,
 123                                         "Could not create GPE Block 0"));
 124                 }
 125         }
 126
 127         if (acpi_gbl_FADT.gpe1_block_length &&
 128             acpi_gbl_FADT.xgpe1_block.address) {
 129
 130                 /* GPE block 1 exists (has both length and address > 0) */
 131
 132                 register_count1 = (u16)(acpi_gbl_FADT.gpe1_block_length / 2);
 133
 134                 /* Check for GPE0/GPE1 overlap (if both banks exist) */
 135
 136                 if ((register_count0) &&
 137                     (gpe_number_max >= acpi_gbl_FADT.gpe1_base)) {
 138                         ACPI_ERROR((AE_INFO,
 139                                     "GPE0 block (GPE 0 to %u) overlaps the GPE1 block "
 140                                     "(GPE %u to %u) - Ignoring GPE1",
 141                                     gpe_number_max, acpi_gbl_FADT.gpe1_base,
 142                                     acpi_gbl_FADT.gpe1_base +
 143                                     ((register_count1 *
 144                                       ACPI_GPE_REGISTER_WIDTH) - 1)));
 145
 146                         /* Ignore GPE1 block by setting the register count to zero */
 147
 148                         register_count1 = 0;
 149                 } else {
 150                         /* Install GPE Block 1 */
 151
 152                         status =
 153                             acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
 154                                                      &acpi_gbl_FADT.xgpe1_block,
 155                                                      register_count1,
 156                                                      acpi_gbl_FADT.gpe1_base,
 157                                                      acpi_gbl_FADT.
 158                                                      sci_interrupt,
 159                                                      &acpi_gbl_gpe_fadt_blocks
 160                                                      [1]);
 161
 162                         if (ACPI_FAILURE(status)) {
 163                                 ACPI_EXCEPTION((AE_INFO, status,
 164                                                 "Could not create GPE Block 1"));
 165                         }
 166
 167                         /*
 168                          * GPE0 and GPE1 do not have to be contiguous in the GPE number
 169                          * space. However, GPE0 always starts at GPE number zero.
 170                          */
 171                         gpe_number_max = acpi_gbl_FADT.gpe1_base +
 172                             ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1);
 173                 }
 174         }
 175
 176         /* Exit if there are no GPE registers */
 177
 178         if ((register_count0 + register_count1) == 0) {
 179
 180                 /* GPEs are not required by ACPI, this is OK */
 181
 182                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 183                                   "There are no GPE blocks defined in the FADT\n"));
 184                 status = AE_OK;
 185                 goto cleanup;
 186         }
 187
 188         /* Check for Max GPE number out-of-range */
 189
 190         if (gpe_number_max > ACPI_GPE_MAX) {
 191                 ACPI_ERROR((AE_INFO,
 192                             "Maximum GPE number from FADT is too large: 0x%X",
 193                             gpe_number_max));
 194                 status = AE_BAD_VALUE;
 195                 goto cleanup;
 196         }
 197
 198       cleanup:
 199         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 200         return_ACPI_STATUS(AE_OK);
 201 }
 202
 203 /*******************************************************************************
 204  *
 205  * FUNCTION:    acpi_ev_update_gpes
 206  *
 207  * PARAMETERS:  table_owner_id      - ID of the newly-loaded ACPI table
 208  *
 209  * RETURN:      None
 210  *
 211  * DESCRIPTION: Check for new GPE methods (_Lxx/_Exx) made available as a
 212  *              result of a Load() or load_table() operation. If new GPE
 213  *              methods have been installed, register the new methods.
 214  *
 215  ******************************************************************************/
 216
 217 void acpi_ev_update_gpes(acpi_owner_id table_owner_id)
 218 {
 219         struct acpi_gpe_xrupt_info *gpe_xrupt_info;
 220         struct acpi_gpe_block_info *gpe_block;
 221         struct acpi_gpe_walk_info walk_info;
 222         acpi_status status = AE_OK;
 223
 224         /*
 225          * 2) Find any _Lxx/_Exx GPE methods that have just been loaded.
 226          *
 227          * Any GPEs that correspond to new _Lxx/_Exx methods are immediately
 228          * enabled.
 229          *
 230          * Examine the namespace underneath each gpe_device within the
 231          * gpe_block lists.
 232          */
 233         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 234         if (ACPI_FAILURE(status)) {
 235                 return;
 236         }
 237
 238         walk_info.owner_id = table_owner_id;
 239         walk_info.execute_by_owner_id = TRUE;
 240         walk_info.count = 0;
 241
 242         /* Walk the interrupt level descriptor list */
 243
 244         gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
 245         while (gpe_xrupt_info) {
 246
 247                 /* Walk all Gpe Blocks attached to this interrupt level */
 248
 249                 gpe_block = gpe_xrupt_info->gpe_block_list_head;
 250                 while (gpe_block) {
 251                         walk_info.gpe_block = gpe_block;
 252                         walk_info.gpe_device = gpe_block->node;
 253
 254                         status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD,
 255                                                         walk_info.gpe_device,
 256                                                         ACPI_UINT32_MAX,
 257                                                         ACPI_NS_WALK_NO_UNLOCK,
 258                                                         acpi_ev_match_gpe_method,
 259                                                         NULL, &walk_info, NULL);
 260                         if (ACPI_FAILURE(status)) {
 261                                 ACPI_EXCEPTION((AE_INFO, status,
 262                                                 "While decoding _Lxx/_Exx methods"));
 263                         }
 264
 265                         gpe_block = gpe_block->next;
 266                 }
 267
 268                 gpe_xrupt_info = gpe_xrupt_info->next;
 269         }
 270
 271         if (walk_info.count) {
 272                 ACPI_INFO((AE_INFO, "Enabled %u new GPEs", walk_info.count));
 273         }
 274
 275         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 276         return;
 277 }
 278
 279 /*******************************************************************************
 280  *
 281  * FUNCTION:    acpi_ev_match_gpe_method
 282  *
 283  * PARAMETERS:  Callback from walk_namespace
 284  *
 285  * RETURN:      Status
 286  *
 287  * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
 288  *              control method under the _GPE portion of the namespace.
 289  *              Extract the name and GPE type from the object, saving this
 290  *              information for quick lookup during GPE dispatch. Allows a
 291  *              per-owner_id evaluation if execute_by_owner_id is TRUE in the
 292  *              walk_info parameter block.
 293  *
 294  *              The name of each GPE control method is of the form:
 295  *              "_Lxx" or "_Exx", where:
 296  *                  L      - means that the GPE is level triggered
 297  *                  E      - means that the GPE is edge triggered
 298  *                  xx     - is the GPE number [in HEX]
 299  *
 300  * If walk_info->execute_by_owner_id is TRUE, we only execute examine GPE methods
 301  *    with that owner.
 302  *
 303  ******************************************************************************/
 304
 305 acpi_status
 306 acpi_ev_match_gpe_method(acpi_handle obj_handle,
 307                          u32 level, void *context, void **return_value)
 308 {
 309         struct acpi_namespace_node *method_node =
 310             ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
 311         struct acpi_gpe_walk_info *walk_info =
 312             ACPI_CAST_PTR(struct acpi_gpe_walk_info, context);
 313         struct acpi_gpe_event_info *gpe_event_info;
 314         u32 gpe_number;
 315         char name[ACPI_NAME_SIZE + 1];
 316         u8 type;
 317
 318         ACPI_FUNCTION_TRACE(ev_match_gpe_method);
 319
 320         /* Check if requested owner_id matches this owner_id */
 321
 322         if ((walk_info->execute_by_owner_id) &&
 323             (method_node->owner_id != walk_info->owner_id)) {
 324                 return_ACPI_STATUS(AE_OK);
 325         }
 326
 327         /*
 328          * Match and decode the _Lxx and _Exx GPE method names
 329          *
 330          * 1) Extract the method name and null terminate it
 331          */
 332         ACPI_MOVE_32_TO_32(name, &method_node->name.integer);
 333         name[ACPI_NAME_SIZE] = 0;
 334
 335         /* 2) Name must begin with an underscore */
 336
 337         if (name[0] != '_') {
 338                 return_ACPI_STATUS(AE_OK);      /* Ignore this method */
 339         }
 340
 341         /*
 342          * 3) Edge/Level determination is based on the 2nd character
 343          *    of the method name
 344          */
 345         switch (name[1]) {
 346         case 'L':
 347                 type = ACPI_GPE_LEVEL_TRIGGERED;
 348                 break;
 349
 350         case 'E':
 351                 type = ACPI_GPE_EDGE_TRIGGERED;
 352                 break;
 353
 354         default:
 355                 /* Unknown method type, just ignore it */
 356
 357                 ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
 358                                   "Ignoring unknown GPE method type: %s "
 359                                   "(name not of form _Lxx or _Exx)", name));
 360                 return_ACPI_STATUS(AE_OK);
 361         }
 362
 363         /* 4) The last two characters of the name are the hex GPE Number */
 364
 365         gpe_number = ACPI_STRTOUL(&name[2], NULL, 16);
 366         if (gpe_number == ACPI_UINT32_MAX) {
 367
 368                 /* Conversion failed; invalid method, just ignore it */
 369
 370                 ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
 371                                   "Could not extract GPE number from name: %s "
 372                                   "(name is not of form _Lxx or _Exx)", name));
 373                 return_ACPI_STATUS(AE_OK);
 374         }
 375
 376         /* Ensure that we have a valid GPE number for this GPE block */
 377
 378         gpe_event_info =
 379             acpi_ev_low_get_gpe_info(gpe_number, walk_info->gpe_block);
 380         if (!gpe_event_info) {
 381                 /*
 382                  * This gpe_number is not valid for this GPE block, just ignore it.
 383                  * However, it may be valid for a different GPE block, since GPE0
 384                  * and GPE1 methods both appear under \_GPE.
 385                  */
 386                 return_ACPI_STATUS(AE_OK);
 387         }
 388
 389         if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
 390             ACPI_GPE_DISPATCH_HANDLER) {
 391
 392                 /* If there is already a handler, ignore this GPE method */
 393
 394                 return_ACPI_STATUS(AE_OK);
 395         }
 396
 397         if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
 398             ACPI_GPE_DISPATCH_METHOD) {
 399                 /*
 400                  * If there is already a method, ignore this method. But check
 401                  * for a type mismatch (if both the _Lxx AND _Exx exist)
 402                  */
 403                 if (type != (gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK)) {
 404                         ACPI_ERROR((AE_INFO,
 405                                     "For GPE 0x%.2X, found both _L%2.2X and _E%2.2X methods",
 406                                     gpe_number, gpe_number, gpe_number));
 407                 }
 408                 return_ACPI_STATUS(AE_OK);
 409         }
 410
 411         /*
 412          * Add the GPE information from above to the gpe_event_info block for
 413          * use during dispatch of this GPE.
 414          */
 415         gpe_event_info->flags |= (u8)(type | ACPI_GPE_DISPATCH_METHOD);
 416         gpe_event_info->dispatch.method_node = method_node;
 417
 418         ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
 419                           "Registered GPE method %s as GPE number 0x%.2X\n",
 420                           name, gpe_number));
 421         return_ACPI_STATUS(AE_OK);
 422 }