release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/acpi/acpica/evgpeblk.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evgpeblk - GPE block creation and initialization.
   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
  49 #define _COMPONENT          ACPI_EVENTS
  50 ACPI_MODULE_NAME("evgpeblk")
  51
  52 /* Local prototypes */
  53 static acpi_status
  54 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
  55                           u32 interrupt_number);
  56
  57 static acpi_status
  58 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block);
  59
  60 /*******************************************************************************
  61  *
  62  * FUNCTION:    acpi_ev_install_gpe_block
  63  *
  64  * PARAMETERS:  gpe_block               - New GPE block
  65  *              interrupt_number        - Xrupt to be associated with this
  66  *                                        GPE block
  67  *
  68  * RETURN:      Status
  69  *
  70  * DESCRIPTION: Install new GPE block with mutex support
  71  *
  72  ******************************************************************************/
  73
  74 static acpi_status
  75 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
  76                           u32 interrupt_number)
  77 {
  78         struct acpi_gpe_block_info *next_gpe_block;
  79         struct acpi_gpe_xrupt_info *gpe_xrupt_block;
  80         acpi_status status;
  81         acpi_cpu_flags flags;
  82
  83         ACPI_FUNCTION_TRACE(ev_install_gpe_block);
  84
  85         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
  86         if (ACPI_FAILURE(status)) {
  87                 return_ACPI_STATUS(status);
  88         }
  89
  90         gpe_xrupt_block = acpi_ev_get_gpe_xrupt_block(interrupt_number);
  91         if (!gpe_xrupt_block) {
  92                 status = AE_NO_MEMORY;
  93                 goto unlock_and_exit;
  94         }
  95
  96         /* Install the new block at the end of the list with lock */
  97
  98         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
  99         if (gpe_xrupt_block->gpe_block_list_head) {
 100                 next_gpe_block = gpe_xrupt_block->gpe_block_list_head;
 101                 while (next_gpe_block->next) {
 102                         next_gpe_block = next_gpe_block->next;
 103                 }
 104
 105                 next_gpe_block->next = gpe_block;
 106                 gpe_block->previous = next_gpe_block;
 107         } else {
 108                 gpe_xrupt_block->gpe_block_list_head = gpe_block;
 109         }
 110
 111         gpe_block->xrupt_block = gpe_xrupt_block;
 112         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 113
 114       unlock_and_exit:
 115         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 116         return_ACPI_STATUS(status);
 117 }
 118
 119 /*******************************************************************************
 120  *
 121  * FUNCTION:    acpi_ev_delete_gpe_block
 122  *
 123  * PARAMETERS:  gpe_block           - Existing GPE block
 124  *
 125  * RETURN:      Status
 126  *
 127  * DESCRIPTION: Remove a GPE block
 128  *
 129  ******************************************************************************/
 130
 131 acpi_status acpi_ev_delete_gpe_block(struct acpi_gpe_block_info *gpe_block)
 132 {
 133         acpi_status status;
 134         acpi_cpu_flags flags;
 135
 136         ACPI_FUNCTION_TRACE(ev_install_gpe_block);
 137
 138         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 139         if (ACPI_FAILURE(status)) {
 140                 return_ACPI_STATUS(status);
 141         }
 142
 143         /* Disable all GPEs in this block */
 144
 145         status =
 146             acpi_hw_disable_gpe_block(gpe_block->xrupt_block, gpe_block, NULL);
 147
 148         if (!gpe_block->previous && !gpe_block->next) {
 149
 150                 /* This is the last gpe_block on this interrupt */
 151
 152                 status = acpi_ev_delete_gpe_xrupt(gpe_block->xrupt_block);
 153                 if (ACPI_FAILURE(status)) {
 154                         goto unlock_and_exit;
 155                 }
 156         } else {
 157                 /* Remove the block on this interrupt with lock */
 158
 159                 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 160                 if (gpe_block->previous) {
 161                         gpe_block->previous->next = gpe_block->next;
 162                 } else {
 163                         gpe_block->xrupt_block->gpe_block_list_head =
 164                             gpe_block->next;
 165                 }
 166
 167                 if (gpe_block->next) {
 168                         gpe_block->next->previous = gpe_block->previous;
 169                 }
 170                 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 171         }
 172
 173         acpi_current_gpe_count -= gpe_block->gpe_count;
 174
 175         /* Free the gpe_block */
 176
 177         ACPI_FREE(gpe_block->register_info);
 178         ACPI_FREE(gpe_block->event_info);
 179         ACPI_FREE(gpe_block);
 180
 181       unlock_and_exit:
 182         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 183         return_ACPI_STATUS(status);
 184 }
 185
 186 /*******************************************************************************
 187  *
 188  * FUNCTION:    acpi_ev_create_gpe_info_blocks
 189  *
 190  * PARAMETERS:  gpe_block   - New GPE block
 191  *
 192  * RETURN:      Status
 193  *
 194  * DESCRIPTION: Create the register_info and event_info blocks for this GPE block
 195  *
 196  ******************************************************************************/
 197
 198 static acpi_status
 199 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block)
 200 {
 201         struct acpi_gpe_register_info *gpe_register_info = NULL;
 202         struct acpi_gpe_event_info *gpe_event_info = NULL;
 203         struct acpi_gpe_event_info *this_event;
 204         struct acpi_gpe_register_info *this_register;
 205         u32 i;
 206         u32 j;
 207         acpi_status status;
 208
 209         ACPI_FUNCTION_TRACE(ev_create_gpe_info_blocks);
 210
 211         /* Allocate the GPE register information block */
 212
 213         gpe_register_info = ACPI_ALLOCATE_ZEROED((acpi_size) gpe_block->
 214                                                  register_count *
 215                                                  sizeof(struct
 216                                                         acpi_gpe_register_info));
 217         if (!gpe_register_info) {
 218                 ACPI_ERROR((AE_INFO,
 219                             "Could not allocate the GpeRegisterInfo table"));
 220                 return_ACPI_STATUS(AE_NO_MEMORY);
 221         }
 222
 223         /*
 224          * Allocate the GPE event_info block. There are eight distinct GPEs
 225          * per register. Initialization to zeros is sufficient.
 226          */
 227         gpe_event_info = ACPI_ALLOCATE_ZEROED((acpi_size) gpe_block->gpe_count *
 228                                               sizeof(struct
 229                                                      acpi_gpe_event_info));
 230         if (!gpe_event_info) {
 231                 ACPI_ERROR((AE_INFO,
 232                             "Could not allocate the GpeEventInfo table"));
 233                 status = AE_NO_MEMORY;
 234                 goto error_exit;
 235         }
 236
 237         /* Save the new Info arrays in the GPE block */
 238
 239         gpe_block->register_info = gpe_register_info;
 240         gpe_block->event_info = gpe_event_info;
 241
 242         /*
 243          * Initialize the GPE Register and Event structures. A goal of these
 244          * tables is to hide the fact that there are two separate GPE register
 245          * sets in a given GPE hardware block, the status registers occupy the
 246          * first half, and the enable registers occupy the second half.
 247          */
 248         this_register = gpe_register_info;
 249         this_event = gpe_event_info;
 250
 251         for (i = 0; i < gpe_block->register_count; i++) {
 252
 253                 /* Init the register_info for this GPE register (8 GPEs) */
 254
 255                 this_register->base_gpe_number =
 256                     (u8) (gpe_block->block_base_number +
 257                           (i * ACPI_GPE_REGISTER_WIDTH));
 258
 259                 this_register->status_address.address =
 260                     gpe_block->block_address.address + i;
 261
 262                 this_register->enable_address.address =
 263                     gpe_block->block_address.address + i +
 264                     gpe_block->register_count;
 265
 266                 this_register->status_address.space_id =
 267                     gpe_block->block_address.space_id;
 268                 this_register->enable_address.space_id =
 269                     gpe_block->block_address.space_id;
 270                 this_register->status_address.bit_width =
 271                     ACPI_GPE_REGISTER_WIDTH;
 272                 this_register->enable_address.bit_width =
 273                     ACPI_GPE_REGISTER_WIDTH;
 274                 this_register->status_address.bit_offset = 0;
 275                 this_register->enable_address.bit_offset = 0;
 276
 277                 /* Init the event_info for each GPE within this register */
 278
 279                 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 280                         this_event->gpe_number =
 281                             (u8) (this_register->base_gpe_number + j);
 282                         this_event->register_info = this_register;
 283                         this_event++;
 284                 }
 285
 286                 /* Disable all GPEs within this register */
 287
 288                 status = acpi_hw_write(0x00, &this_register->enable_address);
 289                 if (ACPI_FAILURE(status)) {
 290                         goto error_exit;
 291                 }
 292
 293                 /* Clear any pending GPE events within this register */
 294
 295                 status = acpi_hw_write(0xFF, &this_register->status_address);
 296                 if (ACPI_FAILURE(status)) {
 297                         goto error_exit;
 298                 }
 299
 300                 this_register++;
 301         }
 302
 303         return_ACPI_STATUS(AE_OK);
 304
 305       error_exit:
 306         if (gpe_register_info) {
 307                 ACPI_FREE(gpe_register_info);
 308         }
 309         if (gpe_event_info) {
 310                 ACPI_FREE(gpe_event_info);
 311         }
 312
 313         return_ACPI_STATUS(status);
 314 }
 315
 316 /*******************************************************************************
 317  *
 318  * FUNCTION:    acpi_ev_create_gpe_block
 319  *
 320  * PARAMETERS:  gpe_device          - Handle to the parent GPE block
 321  *              gpe_block_address   - Address and space_iD
 322  *              register_count      - Number of GPE register pairs in the block
 323  *              gpe_block_base_number - Starting GPE number for the block
 324  *              interrupt_number    - H/W interrupt for the block
 325  *              return_gpe_block    - Where the new block descriptor is returned
 326  *
 327  * RETURN:      Status
 328  *
 329  * DESCRIPTION: Create and Install a block of GPE registers. All GPEs within
 330  *              the block are disabled at exit.
 331  *              Note: Assumes namespace is locked.
 332  *
 333  ******************************************************************************/
 334
 335 acpi_status
 336 acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device,
 337                          struct acpi_generic_address *gpe_block_address,
 338                          u32 register_count,
 339                          u8 gpe_block_base_number,
 340                          u32 interrupt_number,
 341                          struct acpi_gpe_block_info **return_gpe_block)
 342 {
 343         acpi_status status;
 344         struct acpi_gpe_block_info *gpe_block;
 345         struct acpi_gpe_walk_info walk_info;
 346
 347         ACPI_FUNCTION_TRACE(ev_create_gpe_block);
 348
 349         if (!register_count) {
 350                 return_ACPI_STATUS(AE_OK);
 351         }
 352
 353         /* Allocate a new GPE block */
 354
 355         gpe_block = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_block_info));
 356         if (!gpe_block) {
 357                 return_ACPI_STATUS(AE_NO_MEMORY);
 358         }
 359
 360         /* Initialize the new GPE block */
 361
 362         gpe_block->node = gpe_device;
 363         gpe_block->gpe_count = (u16)(register_count * ACPI_GPE_REGISTER_WIDTH);
 364         gpe_block->register_count = register_count;
 365         gpe_block->block_base_number = gpe_block_base_number;
 366
 367         ACPI_MEMCPY(&gpe_block->block_address, gpe_block_address,
 368                     sizeof(struct acpi_generic_address));
 369
 370         /*
 371          * Create the register_info and event_info sub-structures
 372          * Note: disables and clears all GPEs in the block
 373          */
 374         status = acpi_ev_create_gpe_info_blocks(gpe_block);
 375         if (ACPI_FAILURE(status)) {
 376                 ACPI_FREE(gpe_block);
 377                 return_ACPI_STATUS(status);
 378         }
 379
 380         /* Install the new block in the global lists */
 381
 382         status = acpi_ev_install_gpe_block(gpe_block, interrupt_number);
 383         if (ACPI_FAILURE(status)) {
 384                 ACPI_FREE(gpe_block);
 385                 return_ACPI_STATUS(status);
 386         }
 387
 388         /* Find all GPE methods (_Lxx or_Exx) for this block */
 389
 390         walk_info.gpe_block = gpe_block;
 391         walk_info.gpe_device = gpe_device;
 392         walk_info.enable_this_gpe = FALSE;
 393         walk_info.execute_by_owner_id = FALSE;
 394
 395         status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD, gpe_device,
 396                                         ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK,
 397                                         acpi_ev_match_gpe_method, NULL,
 398                                         &walk_info, NULL);
 399
 400         /* Return the new block */
 401
 402         if (return_gpe_block) {
 403                 (*return_gpe_block) = gpe_block;
 404         }
 405
 406         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 407                           "GPE %02X to %02X [%4.4s] %u regs on int 0x%X\n",
 408                           (u32) gpe_block->block_base_number,
 409                           (u32) (gpe_block->block_base_number +
 410                                 (gpe_block->gpe_count - 1)),
 411                           gpe_device->name.ascii, gpe_block->register_count,
 412                           interrupt_number));
 413
 414         /* Update global count of currently available GPEs */
 415
 416         acpi_current_gpe_count += gpe_block->gpe_count;
 417         return_ACPI_STATUS(AE_OK);
 418 }
 419
 420 /*******************************************************************************
 421  *
 422  * FUNCTION:    acpi_ev_initialize_gpe_block
 423  *
 424  * PARAMETERS:  gpe_device          - Handle to the parent GPE block
 425  *              gpe_block           - Gpe Block info
 426  *
 427  * RETURN:      Status
 428  *
 429  * DESCRIPTION: Initialize and enable a GPE block. First find and run any
 430  *              _PRT methods associated with the block, then enable the
 431  *              appropriate GPEs.
 432  *              Note: Assumes namespace is locked.
 433  *
 434  ******************************************************************************/
 435
 436 acpi_status
 437 acpi_ev_initialize_gpe_block(struct acpi_namespace_node *gpe_device,
 438                              struct acpi_gpe_block_info *gpe_block)
 439 {
 440         acpi_status status;
 441         struct acpi_gpe_event_info *gpe_event_info;
 442         u32 gpe_enabled_count;
 443         u32 gpe_index;
 444         u32 gpe_number;
 445         u32 i;
 446         u32 j;
 447
 448         ACPI_FUNCTION_TRACE(ev_initialize_gpe_block);
 449
 450         /* Ignore a null GPE block (e.g., if no GPE block 1 exists) */
 451
 452         if (!gpe_block) {
 453                 return_ACPI_STATUS(AE_OK);
 454         }
 455
 456         /*
 457          * Enable all GPEs that have a corresponding method.  Any other GPEs
 458          * within this block must be enabled via the acpi_enable_gpe interface.
 459          */
 460         gpe_enabled_count = 0;
 461
 462         if (gpe_device == acpi_gbl_fadt_gpe_device) {
 463                 gpe_device = NULL;
 464         }
 465
 466         for (i = 0; i < gpe_block->register_count; i++) {
 467                 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 468
 469                         /* Get the info block for this particular GPE */
 470
 471                         gpe_index = (i * ACPI_GPE_REGISTER_WIDTH) + j;
 472                         gpe_event_info = &gpe_block->event_info[gpe_index];
 473                         gpe_number = gpe_index + gpe_block->block_base_number;
 474
 475                         /* Ignore GPEs that have no corresponding _Lxx/_Exx method */
 476
 477                         if (!(gpe_event_info->flags & ACPI_GPE_DISPATCH_METHOD)) {
 478                                 continue;
 479                         }
 480
 481                         /*
 482                          * If the GPE has already been enabled for runtime
 483                          * signaling, make sure it remains enabled, but do not
 484                          * increment its reference counter.
 485                          */
 486                         status = gpe_event_info->runtime_count ?
 487                                 acpi_ev_enable_gpe(gpe_event_info) :
 488                                 acpi_enable_gpe(gpe_device, gpe_number);
 489
 490                         if (ACPI_FAILURE(status)) {
 491                                 ACPI_EXCEPTION((AE_INFO, status,
 492                                                 "Could not enable GPE 0x%02X",
 493                                                 gpe_number));
 494                                 continue;
 495                         }
 496
 497                         gpe_enabled_count++;
 498                 }
 499         }
 500
 501         if (gpe_enabled_count) {
 502                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 503                                   "Enabled %u GPEs in this block\n",
 504                                   gpe_enabled_count));
 505         }
 506
 507         return_ACPI_STATUS(AE_OK);
 508 }