git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/events/evgpeblk.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evgpeblk - GPE block creation and initialization.
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2005, R. Byron Moore
   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 <acpi/acevents.h>
  46 #include <acpi/acnamesp.h>
  47
  48 #define _COMPONENT          ACPI_EVENTS
  49          ACPI_MODULE_NAME    ("evgpeblk")
  50
  51
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_ev_valid_gpe_event
  55  *
  56  * PARAMETERS:  gpe_event_info              - Info for this GPE
  57  *
  58  * RETURN:      TRUE if the gpe_event is valid
  59  *
  60  * DESCRIPTION: Validate a GPE event.  DO NOT CALL FROM INTERRUPT LEVEL.
  61  *              Should be called only when the GPE lists are semaphore locked
  62  *              and not subject to change.
  63  *
  64  ******************************************************************************/
  65
  66 u8
  67 acpi_ev_valid_gpe_event (
  68         struct acpi_gpe_event_info      *gpe_event_info)
  69 {
  70         struct acpi_gpe_xrupt_info      *gpe_xrupt_block;
  71         struct acpi_gpe_block_info      *gpe_block;
  72
  73
  74         ACPI_FUNCTION_ENTRY ();
  75
  76
  77         /* No need for spin lock since we are not changing any list elements */
  78
  79         /* Walk the GPE interrupt levels */
  80
  81         gpe_xrupt_block = acpi_gbl_gpe_xrupt_list_head;
  82         while (gpe_xrupt_block) {
  83                 gpe_block = gpe_xrupt_block->gpe_block_list_head;
  84
  85                 /* Walk the GPE blocks on this interrupt level */
  86
  87                 while (gpe_block) {
  88                         if ((&gpe_block->event_info[0] <= gpe_event_info) &&
  89                                 (&gpe_block->event_info[((acpi_size) gpe_block->register_count) * 8] > gpe_event_info)) {
  90                                 return (TRUE);
  91                         }
  92
  93                         gpe_block = gpe_block->next;
  94                 }
  95
  96                 gpe_xrupt_block = gpe_xrupt_block->next;
  97         }
  98
  99         return (FALSE);
 100 }
 101
 102
 103 /*******************************************************************************
 104  *
 105  * FUNCTION:    acpi_ev_walk_gpe_list
 106  *
 107  * PARAMETERS:  gpe_walk_callback   - Routine called for each GPE block
 108  *              Flags               - ACPI_NOT_ISR or ACPI_ISR
 109  *
 110  * RETURN:      Status
 111  *
 112  * DESCRIPTION: Walk the GPE lists.
 113  *
 114  ******************************************************************************/
 115
 116 acpi_status
 117 acpi_ev_walk_gpe_list (
 118         ACPI_GPE_CALLBACK       gpe_walk_callback,
 119         u32                             flags)
 120 {
 121         struct acpi_gpe_block_info      *gpe_block;
 122         struct acpi_gpe_xrupt_info      *gpe_xrupt_info;
 123         acpi_status                     status = AE_OK;
 124
 125
 126         ACPI_FUNCTION_TRACE ("ev_walk_gpe_list");
 127
 128
 129         acpi_os_acquire_lock (acpi_gbl_gpe_lock, flags);
 130
 131         /* Walk the interrupt level descriptor list */
 132
 133         gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
 134         while (gpe_xrupt_info) {
 135                 /* Walk all Gpe Blocks attached to this interrupt level */
 136
 137                 gpe_block = gpe_xrupt_info->gpe_block_list_head;
 138                 while (gpe_block) {
 139                         /* One callback per GPE block */
 140
 141                         status = gpe_walk_callback (gpe_xrupt_info, gpe_block);
 142                         if (ACPI_FAILURE (status)) {
 143                                 goto unlock_and_exit;
 144                         }
 145
 146                         gpe_block = gpe_block->next;
 147                 }
 148
 149                 gpe_xrupt_info = gpe_xrupt_info->next;
 150         }
 151
 152 unlock_and_exit:
 153         acpi_os_release_lock (acpi_gbl_gpe_lock, flags);
 154         return_ACPI_STATUS (status);
 155 }
 156
 157
 158 /******************************************************************************
 159  *
 160  * FUNCTION:    acpi_ev_delete_gpe_handlers
 161  *
 162  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 163  *              gpe_block           - Gpe Block info
 164  *
 165  * RETURN:      Status
 166  *
 167  * DESCRIPTION: Delete all Handler objects found in the GPE data structs.
 168  *              Used only prior to termination.
 169  *
 170  ******************************************************************************/
 171
 172 acpi_status
 173 acpi_ev_delete_gpe_handlers (
 174         struct acpi_gpe_xrupt_info      *gpe_xrupt_info,
 175         struct acpi_gpe_block_info      *gpe_block)
 176 {
 177         struct acpi_gpe_event_info      *gpe_event_info;
 178         acpi_native_uint                i;
 179         acpi_native_uint                j;
 180
 181
 182         ACPI_FUNCTION_TRACE ("ev_delete_gpe_handlers");
 183
 184
 185         /* Examine each GPE Register within the block */
 186
 187         for (i = 0; i < gpe_block->register_count; i++) {
 188                 /* Now look at the individual GPEs in this byte register */
 189
 190                 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 191                         gpe_event_info = &gpe_block->event_info[(i * ACPI_GPE_REGISTER_WIDTH) + j];
 192
 193                         if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) == ACPI_GPE_DISPATCH_HANDLER) {
 194                                 ACPI_MEM_FREE (gpe_event_info->dispatch.handler);
 195                                 gpe_event_info->dispatch.handler = NULL;
 196                                 gpe_event_info->flags &= ~ACPI_GPE_DISPATCH_MASK;
 197                         }
 198                 }
 199         }
 200
 201         return_ACPI_STATUS (AE_OK);
 202 }
 203
 204
 205 /*******************************************************************************
 206  *
 207  * FUNCTION:    acpi_ev_save_method_info
 208  *
 209  * PARAMETERS:  Callback from walk_namespace
 210  *
 211  * RETURN:      Status
 212  *
 213  * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
 214  *              control method under the _GPE portion of the namespace.
 215  *              Extract the name and GPE type from the object, saving this
 216  *              information for quick lookup during GPE dispatch
 217  *
 218  *              The name of each GPE control method is of the form:
 219  *              "_Lxx" or "_Exx"
 220  *              Where:
 221  *                  L      - means that the GPE is level triggered
 222  *                  E      - means that the GPE is edge triggered
 223  *                  xx     - is the GPE number [in HEX]
 224  *
 225  ******************************************************************************/
 226
 227 static acpi_status
 228 acpi_ev_save_method_info (
 229         acpi_handle                     obj_handle,
 230         u32                             level,
 231         void                            *obj_desc,
 232         void                            **return_value)
 233 {
 234         struct acpi_gpe_block_info      *gpe_block = (void *) obj_desc;
 235         struct acpi_gpe_event_info      *gpe_event_info;
 236         u32                             gpe_number;
 237         char                            name[ACPI_NAME_SIZE + 1];
 238         u8                              type;
 239         acpi_status                     status;
 240
 241
 242         ACPI_FUNCTION_TRACE ("ev_save_method_info");
 243
 244
 245         /*
 246          * _Lxx and _Exx GPE method support
 247          *
 248          * 1) Extract the name from the object and convert to a string
 249          */
 250         ACPI_MOVE_32_TO_32 (name,
 251                            &((struct acpi_namespace_node *) obj_handle)->name.integer);
 252         name[ACPI_NAME_SIZE] = 0;
 253
 254         /*
 255          * 2) Edge/Level determination is based on the 2nd character
 256          *    of the method name
 257          *
 258          * NOTE: Default GPE type is RUNTIME.  May be changed later to WAKE
 259          * if a _PRW object is found that points to this GPE.
 260          */
 261         switch (name[1]) {
 262         case 'L':
 263                 type = ACPI_GPE_LEVEL_TRIGGERED;
 264                 break;
 265
 266         case 'E':
 267                 type = ACPI_GPE_EDGE_TRIGGERED;
 268                 break;
 269
 270         default:
 271                 /* Unknown method type, just ignore it! */
 272
 273                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 274                         "Unknown GPE method type: %s (name not of form _Lxx or _Exx)\n",
 275                         name));
 276                 return_ACPI_STATUS (AE_OK);
 277         }
 278
 279         /* Convert the last two characters of the name to the GPE Number */
 280
 281         gpe_number = ACPI_STRTOUL (&name[2], NULL, 16);
 282         if (gpe_number == ACPI_UINT32_MAX) {
 283                 /* Conversion failed; invalid method, just ignore it */
 284
 285                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 286                         "Could not extract GPE number from name: %s (name is not of form _Lxx or _Exx)\n",
 287                         name));
 288                 return_ACPI_STATUS (AE_OK);
 289         }
 290
 291         /* Ensure that we have a valid GPE number for this GPE block */
 292
 293         if ((gpe_number < gpe_block->block_base_number) ||
 294                 (gpe_number >= (gpe_block->block_base_number + (gpe_block->register_count * 8)))) {
 295                 /*
 296                  * Not valid for this GPE block, just ignore it
 297                  * However, it may be valid for a different GPE block, since GPE0 and GPE1
 298                  * methods both appear under \_GPE.
 299                  */
 300                 return_ACPI_STATUS (AE_OK);
 301         }
 302
 303         /*
 304          * Now we can add this information to the gpe_event_info block
 305          * for use during dispatch of this GPE.  Default type is RUNTIME, although
 306          * this may change when the _PRW methods are executed later.
 307          */
 308         gpe_event_info = &gpe_block->event_info[gpe_number - gpe_block->block_base_number];
 309
 310         gpe_event_info->flags = (u8) (type | ACPI_GPE_DISPATCH_METHOD |
 311                            ACPI_GPE_TYPE_RUNTIME);
 312
 313         gpe_event_info->dispatch.method_node = (struct acpi_namespace_node *) obj_handle;
 314
 315         /* Update enable mask, but don't enable the HW GPE as of yet */
 316
 317         status = acpi_ev_enable_gpe (gpe_event_info, FALSE);
 318
 319         ACPI_DEBUG_PRINT ((ACPI_DB_LOAD,
 320                 "Registered GPE method %s as GPE number 0x%.2X\n",
 321                 name, gpe_number));
 322         return_ACPI_STATUS (status);
 323 }
 324
 325
 326 /*******************************************************************************
 327  *
 328  * FUNCTION:    acpi_ev_match_prw_and_gpe
 329  *
 330  * PARAMETERS:  Callback from walk_namespace
 331  *
 332  * RETURN:      Status.  NOTE: We ignore errors so that the _PRW walk is
 333  *              not aborted on a single _PRW failure.
 334  *
 335  * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
 336  *              Device.  Run the _PRW method.  If present, extract the GPE
 337  *              number and mark the GPE as a WAKE GPE.
 338  *
 339  ******************************************************************************/
 340
 341 static acpi_status
 342 acpi_ev_match_prw_and_gpe (
 343         acpi_handle                     obj_handle,
 344         u32                             level,
 345         void                            *info,
 346         void                            **return_value)
 347 {
 348         struct acpi_gpe_walk_info       *gpe_info = (void *) info;
 349         struct acpi_namespace_node      *gpe_device;
 350         struct acpi_gpe_block_info      *gpe_block;
 351         struct acpi_namespace_node      *target_gpe_device;
 352         struct acpi_gpe_event_info      *gpe_event_info;
 353         union acpi_operand_object       *pkg_desc;
 354         union acpi_operand_object       *obj_desc;
 355         u32                             gpe_number;
 356         acpi_status                     status;
 357
 358
 359         ACPI_FUNCTION_TRACE ("ev_match_prw_and_gpe");
 360
 361
 362         /* Check for a _PRW method under this device */
 363
 364         status = acpi_ut_evaluate_object (obj_handle, METHOD_NAME__PRW,
 365                          ACPI_BTYPE_PACKAGE, &pkg_desc);
 366         if (ACPI_FAILURE (status)) {
 367                 /* Ignore all errors from _PRW, we don't want to abort the subsystem */
 368
 369                 return_ACPI_STATUS (AE_OK);
 370         }
 371
 372         /* The returned _PRW package must have at least two elements */
 373
 374         if (pkg_desc->package.count < 2) {
 375                 goto cleanup;
 376         }
 377
 378         /* Extract pointers from the input context */
 379
 380         gpe_device = gpe_info->gpe_device;
 381         gpe_block = gpe_info->gpe_block;
 382
 383         /*
 384          * The _PRW object must return a package, we are only interested
 385          * in the first element
 386          */
 387         obj_desc = pkg_desc->package.elements[0];
 388
 389         if (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_INTEGER) {
 390                 /* Use FADT-defined GPE device (from definition of _PRW) */
 391
 392                 target_gpe_device = acpi_gbl_fadt_gpe_device;
 393
 394                 /* Integer is the GPE number in the FADT described GPE blocks */
 395
 396                 gpe_number = (u32) obj_desc->integer.value;
 397         }
 398         else if (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_PACKAGE) {
 399                 /* Package contains a GPE reference and GPE number within a GPE block */
 400
 401                 if ((obj_desc->package.count < 2) ||
 402                         (ACPI_GET_OBJECT_TYPE (obj_desc->package.elements[0]) != ACPI_TYPE_LOCAL_REFERENCE) ||
 403                         (ACPI_GET_OBJECT_TYPE (obj_desc->package.elements[1]) != ACPI_TYPE_INTEGER)) {
 404                         goto cleanup;
 405                 }
 406
 407                 /* Get GPE block reference and decode */
 408
 409                 target_gpe_device = obj_desc->package.elements[0]->reference.node;
 410                 gpe_number = (u32) obj_desc->package.elements[1]->integer.value;
 411         }
 412         else {
 413                 /* Unknown type, just ignore it */
 414
 415                 goto cleanup;
 416         }
 417
 418         /*
 419          * Is this GPE within this block?
 420          *
 421          * TRUE iff these conditions are true:
 422          *     1) The GPE devices match.
 423          *     2) The GPE index(number) is within the range of the Gpe Block
 424          *          associated with the GPE device.
 425          */
 426         if ((gpe_device == target_gpe_device) &&
 427                 (gpe_number >= gpe_block->block_base_number) &&
 428                 (gpe_number < gpe_block->block_base_number + (gpe_block->register_count * 8))) {
 429                 gpe_event_info = &gpe_block->event_info[gpe_number - gpe_block->block_base_number];
 430
 431                 /* Mark GPE for WAKE-ONLY but WAKE_DISABLED */
 432
 433                 gpe_event_info->flags &= ~(ACPI_GPE_WAKE_ENABLED | ACPI_GPE_RUN_ENABLED);
 434                 status = acpi_ev_set_gpe_type (gpe_event_info, ACPI_GPE_TYPE_WAKE);
 435                 if (ACPI_FAILURE (status)) {
 436                         goto cleanup;
 437                 }
 438                 status = acpi_ev_update_gpe_enable_masks (gpe_event_info, ACPI_GPE_DISABLE);
 439         }
 440
 441 cleanup:
 442         acpi_ut_remove_reference (pkg_desc);
 443         return_ACPI_STATUS (AE_OK);
 444 }
 445
 446
 447 /*******************************************************************************
 448  *
 449  * FUNCTION:    acpi_ev_get_gpe_xrupt_block
 450  *
 451  * PARAMETERS:  interrupt_level     - Interrupt for a GPE block
 452  *
 453  * RETURN:      A GPE interrupt block
 454  *
 455  * DESCRIPTION: Get or Create a GPE interrupt block.  There is one interrupt
 456  *              block per unique interrupt level used for GPEs.
 457  *              Should be called only when the GPE lists are semaphore locked
 458  *              and not subject to change.
 459  *
 460  ******************************************************************************/
 461
 462 static struct acpi_gpe_xrupt_info *
 463 acpi_ev_get_gpe_xrupt_block (
 464         u32                             interrupt_level)
 465 {
 466         struct acpi_gpe_xrupt_info      *next_gpe_xrupt;
 467         struct acpi_gpe_xrupt_info      *gpe_xrupt;
 468         acpi_status                     status;
 469
 470
 471         ACPI_FUNCTION_TRACE ("ev_get_gpe_xrupt_block");
 472
 473
 474         /* No need for spin lock since we are not changing any list elements here */
 475
 476         next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
 477         while (next_gpe_xrupt) {
 478                 if (next_gpe_xrupt->interrupt_level == interrupt_level) {
 479                         return_PTR (next_gpe_xrupt);
 480                 }
 481
 482                 next_gpe_xrupt = next_gpe_xrupt->next;
 483         }
 484
 485         /* Not found, must allocate a new xrupt descriptor */
 486
 487         gpe_xrupt = ACPI_MEM_CALLOCATE (sizeof (struct acpi_gpe_xrupt_info));
 488         if (!gpe_xrupt) {
 489                 return_PTR (NULL);
 490         }
 491
 492         gpe_xrupt->interrupt_level = interrupt_level;
 493
 494         /* Install new interrupt descriptor with spin lock */
 495
 496         acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
 497         if (acpi_gbl_gpe_xrupt_list_head) {
 498                 next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
 499                 while (next_gpe_xrupt->next) {
 500                         next_gpe_xrupt = next_gpe_xrupt->next;
 501                 }
 502
 503                 next_gpe_xrupt->next = gpe_xrupt;
 504                 gpe_xrupt->previous = next_gpe_xrupt;
 505         }
 506         else {
 507                 acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;
 508         }
 509         acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
 510
 511         /* Install new interrupt handler if not SCI_INT */
 512
 513         if (interrupt_level != acpi_gbl_FADT->sci_int) {
 514                 status = acpi_os_install_interrupt_handler (interrupt_level,
 515                                  acpi_ev_gpe_xrupt_handler, gpe_xrupt);
 516                 if (ACPI_FAILURE (status)) {
 517                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 518                                 "Could not install GPE interrupt handler at level 0x%X\n",
 519                                 interrupt_level));
 520                         return_PTR (NULL);
 521                 }
 522         }
 523
 524         return_PTR (gpe_xrupt);
 525 }
 526
 527
 528 /*******************************************************************************
 529  *
 530  * FUNCTION:    acpi_ev_delete_gpe_xrupt
 531  *
 532  * PARAMETERS:  gpe_xrupt       - A GPE interrupt info block
 533  *
 534  * RETURN:      Status
 535  *
 536  * DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated
 537  *              interrupt handler if not the SCI interrupt.
 538  *
 539  ******************************************************************************/
 540
 541 static acpi_status
 542 acpi_ev_delete_gpe_xrupt (
 543         struct acpi_gpe_xrupt_info      *gpe_xrupt)
 544 {
 545         acpi_status                     status;
 546
 547
 548         ACPI_FUNCTION_TRACE ("ev_delete_gpe_xrupt");
 549
 550
 551         /* We never want to remove the SCI interrupt handler */
 552
 553         if (gpe_xrupt->interrupt_level == acpi_gbl_FADT->sci_int) {
 554                 gpe_xrupt->gpe_block_list_head = NULL;
 555                 return_ACPI_STATUS (AE_OK);
 556         }
 557
 558         /* Disable this interrupt */
 559
 560         status = acpi_os_remove_interrupt_handler (gpe_xrupt->interrupt_level,
 561                            acpi_ev_gpe_xrupt_handler);
 562         if (ACPI_FAILURE (status)) {
 563                 return_ACPI_STATUS (status);
 564         }
 565
 566         /* Unlink the interrupt block with lock */
 567
 568         acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
 569         if (gpe_xrupt->previous) {
 570                 gpe_xrupt->previous->next = gpe_xrupt->next;
 571         }
 572
 573         if (gpe_xrupt->next) {
 574                 gpe_xrupt->next->previous = gpe_xrupt->previous;
 575         }
 576         acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
 577
 578         /* Free the block */
 579
 580         ACPI_MEM_FREE (gpe_xrupt);
 581         return_ACPI_STATUS (AE_OK);
 582 }
 583
 584
 585 /*******************************************************************************
 586  *
 587  * FUNCTION:    acpi_ev_install_gpe_block
 588  *
 589  * PARAMETERS:  gpe_block       - New GPE block
 590  *              interrupt_level - Level to be associated with this GPE block
 591  *
 592  * RETURN:      Status
 593  *
 594  * DESCRIPTION: Install new GPE block with mutex support
 595  *
 596  ******************************************************************************/
 597
 598 static acpi_status
 599 acpi_ev_install_gpe_block (
 600         struct acpi_gpe_block_info      *gpe_block,
 601         u32                             interrupt_level)
 602 {
 603         struct acpi_gpe_block_info      *next_gpe_block;
 604         struct acpi_gpe_xrupt_info      *gpe_xrupt_block;
 605         acpi_status                     status;
 606
 607
 608         ACPI_FUNCTION_TRACE ("ev_install_gpe_block");
 609
 610
 611         status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 612         if (ACPI_FAILURE (status)) {
 613                 return_ACPI_STATUS (status);
 614         }
 615
 616         gpe_xrupt_block = acpi_ev_get_gpe_xrupt_block (interrupt_level);
 617         if (!gpe_xrupt_block) {
 618                 status = AE_NO_MEMORY;
 619                 goto unlock_and_exit;
 620         }
 621
 622         /* Install the new block at the end of the list for this interrupt with lock */
 623
 624         acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
 625         if (gpe_xrupt_block->gpe_block_list_head) {
 626                 next_gpe_block = gpe_xrupt_block->gpe_block_list_head;
 627                 while (next_gpe_block->next) {
 628                         next_gpe_block = next_gpe_block->next;
 629                 }
 630
 631                 next_gpe_block->next = gpe_block;
 632                 gpe_block->previous = next_gpe_block;
 633         }
 634         else {
 635                 gpe_xrupt_block->gpe_block_list_head = gpe_block;
 636         }
 637
 638         gpe_block->xrupt_block = gpe_xrupt_block;
 639         acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
 640
 641 unlock_and_exit:
 642         status = acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 643         return_ACPI_STATUS (status);
 644 }
 645
 646
 647 /*******************************************************************************
 648  *
 649  * FUNCTION:    acpi_ev_delete_gpe_block
 650  *
 651  * PARAMETERS:  gpe_block       - Existing GPE block
 652  *
 653  * RETURN:      Status
 654  *
 655  * DESCRIPTION: Remove a GPE block
 656  *
 657  ******************************************************************************/
 658
 659 acpi_status
 660 acpi_ev_delete_gpe_block (
 661         struct acpi_gpe_block_info      *gpe_block)
 662 {
 663         acpi_status                     status;
 664
 665
 666         ACPI_FUNCTION_TRACE ("ev_install_gpe_block");
 667
 668
 669         status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
 670         if (ACPI_FAILURE (status)) {
 671                 return_ACPI_STATUS (status);
 672         }
 673
 674         /* Disable all GPEs in this block */
 675
 676         status = acpi_hw_disable_gpe_block (gpe_block->xrupt_block, gpe_block);
 677
 678         if (!gpe_block->previous && !gpe_block->next) {
 679                 /* This is the last gpe_block on this interrupt */
 680
 681                 status = acpi_ev_delete_gpe_xrupt (gpe_block->xrupt_block);
 682                 if (ACPI_FAILURE (status)) {
 683                         goto unlock_and_exit;
 684                 }
 685         }
 686         else {
 687                 /* Remove the block on this interrupt with lock */
 688
 689                 acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
 690                 if (gpe_block->previous) {
 691                         gpe_block->previous->next = gpe_block->next;
 692                 }
 693                 else {
 694                         gpe_block->xrupt_block->gpe_block_list_head = gpe_block->next;
 695                 }
 696
 697                 if (gpe_block->next) {
 698                         gpe_block->next->previous = gpe_block->previous;
 699                 }
 700                 acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
 701         }
 702
 703         /* Free the gpe_block */
 704
 705         ACPI_MEM_FREE (gpe_block->register_info);
 706         ACPI_MEM_FREE (gpe_block->event_info);
 707         ACPI_MEM_FREE (gpe_block);
 708
 709 unlock_and_exit:
 710         status = acpi_ut_release_mutex (ACPI_MTX_EVENTS);
 711         return_ACPI_STATUS (status);
 712 }
 713
 714
 715 /*******************************************************************************
 716  *
 717  * FUNCTION:    acpi_ev_create_gpe_info_blocks
 718  *
 719  * PARAMETERS:  gpe_block   - New GPE block
 720  *
 721  * RETURN:      Status
 722  *
 723  * DESCRIPTION: Create the register_info and event_info blocks for this GPE block
 724  *
 725  ******************************************************************************/
 726
 727 static acpi_status
 728 acpi_ev_create_gpe_info_blocks (
 729         struct acpi_gpe_block_info      *gpe_block)
 730 {
 731         struct acpi_gpe_register_info   *gpe_register_info = NULL;
 732         struct acpi_gpe_event_info      *gpe_event_info = NULL;
 733         struct acpi_gpe_event_info      *this_event;
 734         struct acpi_gpe_register_info   *this_register;
 735         acpi_native_uint                i;
 736         acpi_native_uint                j;
 737         acpi_status                     status;
 738
 739
 740         ACPI_FUNCTION_TRACE ("ev_create_gpe_info_blocks");
 741
 742
 743         /* Allocate the GPE register information block */
 744
 745         gpe_register_info = ACPI_MEM_CALLOCATE (
 746                           (acpi_size) gpe_block->register_count *
 747                           sizeof (struct acpi_gpe_register_info));
 748         if (!gpe_register_info) {
 749                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 750                         "Could not allocate the gpe_register_info table\n"));
 751                 return_ACPI_STATUS (AE_NO_MEMORY);
 752         }
 753
 754         /*
 755          * Allocate the GPE event_info block. There are eight distinct GPEs
 756          * per register.  Initialization to zeros is sufficient.
 757          */
 758         gpe_event_info = ACPI_MEM_CALLOCATE (
 759                            ((acpi_size) gpe_block->register_count * ACPI_GPE_REGISTER_WIDTH) *
 760                            sizeof (struct acpi_gpe_event_info));
 761         if (!gpe_event_info) {
 762                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not allocate the gpe_event_info table\n"));
 763                 status = AE_NO_MEMORY;
 764                 goto error_exit;
 765         }
 766
 767         /* Save the new Info arrays in the GPE block */
 768
 769         gpe_block->register_info = gpe_register_info;
 770         gpe_block->event_info  = gpe_event_info;
 771
 772         /*
 773          * Initialize the GPE Register and Event structures.  A goal of these
 774          * tables is to hide the fact that there are two separate GPE register sets
 775          * in a given gpe hardware block, the status registers occupy the first half,
 776          * and the enable registers occupy the second half.
 777          */
 778         this_register = gpe_register_info;
 779         this_event   = gpe_event_info;
 780
 781         for (i = 0; i < gpe_block->register_count; i++) {
 782                 /* Init the register_info for this GPE register (8 GPEs) */
 783
 784                 this_register->base_gpe_number = (u8) (gpe_block->block_base_number +
 785                                    (i * ACPI_GPE_REGISTER_WIDTH));
 786
 787                 ACPI_STORE_ADDRESS (this_register->status_address.address,
 788                                  (gpe_block->block_address.address
 789                                  + i));
 790
 791                 ACPI_STORE_ADDRESS (this_register->enable_address.address,
 792                                  (gpe_block->block_address.address
 793                                  + i
 794                                  + gpe_block->register_count));
 795
 796                 this_register->status_address.address_space_id = gpe_block->block_address.address_space_id;
 797                 this_register->enable_address.address_space_id = gpe_block->block_address.address_space_id;
 798                 this_register->status_address.register_bit_width = ACPI_GPE_REGISTER_WIDTH;
 799                 this_register->enable_address.register_bit_width = ACPI_GPE_REGISTER_WIDTH;
 800                 this_register->status_address.register_bit_offset = ACPI_GPE_REGISTER_WIDTH;
 801                 this_register->enable_address.register_bit_offset = ACPI_GPE_REGISTER_WIDTH;
 802
 803                 /* Init the event_info for each GPE within this register */
 804
 805                 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 806                         this_event->register_bit = acpi_gbl_decode_to8bit[j];
 807                         this_event->register_info = this_register;
 808                         this_event++;
 809                 }
 810
 811                 /*
 812                  * Clear the status/enable registers.  Note that status registers
 813                  * are cleared by writing a '1', while enable registers are cleared
 814                  * by writing a '0'.
 815                  */
 816                 status = acpi_hw_low_level_write (ACPI_GPE_REGISTER_WIDTH, 0x00,
 817                                  &this_register->enable_address);
 818                 if (ACPI_FAILURE (status)) {
 819                         goto error_exit;
 820                 }
 821
 822                 status = acpi_hw_low_level_write (ACPI_GPE_REGISTER_WIDTH, 0xFF,
 823                                  &this_register->status_address);
 824                 if (ACPI_FAILURE (status)) {
 825                         goto error_exit;
 826                 }
 827
 828                 this_register++;
 829         }
 830
 831         return_ACPI_STATUS (AE_OK);
 832
 833
 834 error_exit:
 835         if (gpe_register_info) {
 836                 ACPI_MEM_FREE (gpe_register_info);
 837         }
 838         if (gpe_event_info) {
 839                 ACPI_MEM_FREE (gpe_event_info);
 840         }
 841
 842         return_ACPI_STATUS (status);
 843 }
 844
 845
 846 /*******************************************************************************
 847  *
 848  * FUNCTION:    acpi_ev_create_gpe_block
 849  *
 850  * PARAMETERS:  gpe_device          - Handle to the parent GPE block
 851  *              gpe_block_address   - Address and space_iD
 852  *              register_count      - Number of GPE register pairs in the block
 853  *              gpe_block_base_number - Starting GPE number for the block
 854  *              interrupt_level     - H/W interrupt for the block
 855  *              return_gpe_block    - Where the new block descriptor is returned
 856  *
 857  * RETURN:      Status
 858  *
 859  * DESCRIPTION: Create and Install a block of GPE registers
 860  *
 861  ******************************************************************************/
 862
 863 acpi_status
 864 acpi_ev_create_gpe_block (
 865         struct acpi_namespace_node      *gpe_device,
 866         struct acpi_generic_address     *gpe_block_address,
 867         u32                             register_count,
 868         u8                              gpe_block_base_number,
 869         u32                             interrupt_level,
 870         struct acpi_gpe_block_info      **return_gpe_block)
 871 {
 872         struct acpi_gpe_block_info      *gpe_block;
 873         struct acpi_gpe_event_info      *gpe_event_info;
 874         acpi_native_uint                i;
 875         acpi_native_uint                j;
 876         u32                             wake_gpe_count;
 877         u32                             gpe_enabled_count;
 878         acpi_status                     status;
 879         struct acpi_gpe_walk_info       gpe_info;
 880
 881
 882         ACPI_FUNCTION_TRACE ("ev_create_gpe_block");
 883
 884
 885         if (!register_count) {
 886                 return_ACPI_STATUS (AE_OK);
 887         }
 888
 889         /* Allocate a new GPE block */
 890
 891         gpe_block = ACPI_MEM_CALLOCATE (sizeof (struct acpi_gpe_block_info));
 892         if (!gpe_block) {
 893                 return_ACPI_STATUS (AE_NO_MEMORY);
 894         }
 895
 896         /* Initialize the new GPE block */
 897
 898         gpe_block->register_count = register_count;
 899         gpe_block->block_base_number = gpe_block_base_number;
 900         gpe_block->node           = gpe_device;
 901
 902         ACPI_MEMCPY (&gpe_block->block_address, gpe_block_address, sizeof (struct acpi_generic_address));
 903
 904         /* Create the register_info and event_info sub-structures */
 905
 906         status = acpi_ev_create_gpe_info_blocks (gpe_block);
 907         if (ACPI_FAILURE (status)) {
 908                 ACPI_MEM_FREE (gpe_block);
 909                 return_ACPI_STATUS (status);
 910         }
 911
 912         /* Install the new block in the global list(s) */
 913
 914         status = acpi_ev_install_gpe_block (gpe_block, interrupt_level);
 915         if (ACPI_FAILURE (status)) {
 916                 ACPI_MEM_FREE (gpe_block);
 917                 return_ACPI_STATUS (status);
 918         }
 919
 920         /* Find all GPE methods (_Lxx, _Exx) for this block */
 921
 922         status = acpi_ns_walk_namespace (ACPI_TYPE_METHOD, gpe_device,
 923                           ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK, acpi_ev_save_method_info,
 924                           gpe_block, NULL);
 925
 926         /*
 927          * Runtime option: Should Wake GPEs be enabled at runtime?  The default
 928          * is No, they should only be enabled just as the machine goes to sleep.
 929          */
 930         if (acpi_gbl_leave_wake_gpes_disabled) {
 931                 /*
 932                  * Differentiate RUNTIME vs WAKE GPEs, via the _PRW control methods.
 933                  * (Each GPE that has one or more _PRWs that reference it is by
 934                  * definition a WAKE GPE and will not be enabled while the machine
 935                  * is running.)
 936                  */
 937                 gpe_info.gpe_block = gpe_block;
 938                 gpe_info.gpe_device = gpe_device;
 939
 940                 status = acpi_ns_walk_namespace (ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 941                                   ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK, acpi_ev_match_prw_and_gpe,
 942                                   &gpe_info, NULL);
 943         }
 944
 945         /*
 946          * Enable all GPEs in this block that are 1) "runtime" or "run/wake" GPEs,
 947          * and 2) have a corresponding _Lxx or _Exx method.  All other GPEs must
 948          * be enabled via the acpi_enable_gpe() external interface.
 949          */
 950         wake_gpe_count = 0;
 951         gpe_enabled_count = 0;
 952
 953         for (i = 0; i < gpe_block->register_count; i++) {
 954                 for (j = 0; j < 8; j++) {
 955                         /* Get the info block for this particular GPE */
 956
 957                         gpe_event_info = &gpe_block->event_info[(i * ACPI_GPE_REGISTER_WIDTH) + j];
 958
 959                         if (((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) == ACPI_GPE_DISPATCH_METHOD) &&
 960                                  (gpe_event_info->flags & ACPI_GPE_TYPE_RUNTIME)) {
 961                                 gpe_enabled_count++;
 962                         }
 963
 964                         if (gpe_event_info->flags & ACPI_GPE_TYPE_WAKE) {
 965                                 wake_gpe_count++;
 966                         }
 967                 }
 968         }
 969
 970         /* Dump info about this GPE block */
 971
 972         ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
 973                 "GPE %02X to %02X [%4.4s] %u regs on int 0x%X\n",
 974                 (u32) gpe_block->block_base_number,
 975                 (u32) (gpe_block->block_base_number +
 976                                 ((gpe_block->register_count * ACPI_GPE_REGISTER_WIDTH) -1)),
 977                 gpe_device->name.ascii,
 978                 gpe_block->register_count,
 979                 interrupt_level));
 980
 981         /* Enable all valid GPEs found above */
 982
 983         status = acpi_hw_enable_runtime_gpe_block (NULL, gpe_block);
 984
 985         ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
 986                         "Found %u Wake, Enabled %u Runtime GPEs in this block\n",
 987                         wake_gpe_count, gpe_enabled_count));
 988
 989         /* Return the new block */
 990
 991         if (return_gpe_block) {
 992                 (*return_gpe_block) = gpe_block;
 993         }
 994
 995         return_ACPI_STATUS (AE_OK);
 996 }
 997
 998
 999 /*******************************************************************************
1000  *
1001  * FUNCTION:    acpi_ev_gpe_initialize
1002  *
1003  * PARAMETERS:  None
1004  *
1005  * RETURN:      Status
1006  *
1007  * DESCRIPTION: Initialize the GPE data structures
1008  *
1009  ******************************************************************************/
1010
1011 acpi_status
1012 acpi_ev_gpe_initialize (
1013         void)
1014 {
1015         u32                             register_count0 = 0;
1016         u32                             register_count1 = 0;
1017         u32                             gpe_number_max = 0;
1018         acpi_status                     status;
1019
1020
1021         ACPI_FUNCTION_TRACE ("ev_gpe_initialize");
1022
1023
1024         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
1025         if (ACPI_FAILURE (status)) {
1026                 return_ACPI_STATUS (status);
1027         }
1028
1029         /*
1030          * Initialize the GPE Block(s) defined in the FADT
1031          *
1032          * Why the GPE register block lengths are divided by 2:  From the ACPI Spec,
1033          * section "General-Purpose Event Registers", we have:
1034          *
1035          * "Each register block contains two registers of equal length
1036          *  GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
1037          *  GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
1038          *  The length of the GPE1_STS and GPE1_EN registers is equal to
1039          *  half the GPE1_LEN. If a generic register block is not supported
1040          *  then its respective block pointer and block length values in the
1041          *  FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
1042          *  to be the same size."
1043          */
1044
1045         /*
1046          * Determine the maximum GPE number for this machine.
1047          *
1048          * Note: both GPE0 and GPE1 are optional, and either can exist without
1049          * the other.
1050          *
1051          * If EITHER the register length OR the block address are zero, then that
1052          * particular block is not supported.
1053          */
1054         if (acpi_gbl_FADT->gpe0_blk_len &&
1055                 acpi_gbl_FADT->xgpe0_blk.address) {
1056                 /* GPE block 0 exists (has both length and address > 0) */
1057
1058                 register_count0 = (u16) (acpi_gbl_FADT->gpe0_blk_len / 2);
1059
1060                 gpe_number_max = (register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1;
1061
1062                 /* Install GPE Block 0 */
1063
1064                 status = acpi_ev_create_gpe_block (acpi_gbl_fadt_gpe_device, &acpi_gbl_FADT->xgpe0_blk,
1065                                  register_count0, 0, acpi_gbl_FADT->sci_int, &acpi_gbl_gpe_fadt_blocks[0]);
1066
1067                 if (ACPI_FAILURE (status)) {
1068                         ACPI_REPORT_ERROR ((
1069                                 "Could not create GPE Block 0, %s\n",
1070                                 acpi_format_exception (status)));
1071                 }
1072         }
1073
1074         if (acpi_gbl_FADT->gpe1_blk_len &&
1075                 acpi_gbl_FADT->xgpe1_blk.address) {
1076                 /* GPE block 1 exists (has both length and address > 0) */
1077
1078                 register_count1 = (u16) (acpi_gbl_FADT->gpe1_blk_len / 2);
1079
1080                 /* Check for GPE0/GPE1 overlap (if both banks exist) */
1081
1082                 if ((register_count0) &&
1083                         (gpe_number_max >= acpi_gbl_FADT->gpe1_base)) {
1084                         ACPI_REPORT_ERROR ((
1085                                 "GPE0 block (GPE 0 to %d) overlaps the GPE1 block (GPE %d to %d) - Ignoring GPE1\n",
1086                                 gpe_number_max, acpi_gbl_FADT->gpe1_base,
1087                                 acpi_gbl_FADT->gpe1_base +
1088                                 ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1)));
1089
1090                         /* Ignore GPE1 block by setting the register count to zero */
1091
1092                         register_count1 = 0;
1093                 }
1094                 else {
1095                         /* Install GPE Block 1 */
1096
1097                         status = acpi_ev_create_gpe_block (acpi_gbl_fadt_gpe_device, &acpi_gbl_FADT->xgpe1_blk,
1098                                          register_count1, acpi_gbl_FADT->gpe1_base,
1099                                          acpi_gbl_FADT->sci_int, &acpi_gbl_gpe_fadt_blocks[1]);
1100
1101                         if (ACPI_FAILURE (status)) {
1102                                 ACPI_REPORT_ERROR ((
1103                                         "Could not create GPE Block 1, %s\n",
1104                                         acpi_format_exception (status)));
1105                         }
1106
1107                         /*
1108                          * GPE0 and GPE1 do not have to be contiguous in the GPE number
1109                          * space. However, GPE0 always starts at GPE number zero.
1110                          */
1111                         gpe_number_max = acpi_gbl_FADT->gpe1_base +
1112                                            ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1);
1113                 }
1114         }
1115
1116         /* Exit if there are no GPE registers */
1117
1118         if ((register_count0 + register_count1) == 0) {
1119                 /* GPEs are not required by ACPI, this is OK */
1120
1121                 ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
1122                                 "There are no GPE blocks defined in the FADT\n"));
1123                 status = AE_OK;
1124                 goto cleanup;
1125         }
1126
1127         /* Check for Max GPE number out-of-range */
1128
1129         if (gpe_number_max > ACPI_GPE_MAX) {
1130                 ACPI_REPORT_ERROR (("Maximum GPE number from FADT is too large: 0x%X\n",
1131                         gpe_number_max));
1132                 status = AE_BAD_VALUE;
1133                 goto cleanup;
1134         }
1135
1136 cleanup:
1137         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
1138         return_ACPI_STATUS (AE_OK);
1139 }
1140
1141