drivers/acpi/acpica/hwgpe.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: hwgpe - Low level GPE enable/disable/clear functions
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2010, Intel Corp.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include "accommon.h"
  47 #include "acevents.h"
  48
  49 #define _COMPONENT          ACPI_HARDWARE
  50 ACPI_MODULE_NAME("hwgpe")
  51
  52 /* Local prototypes */
  53 static acpi_status
  54 acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
  55                                 struct acpi_gpe_block_info *gpe_block,
  56                                 void *context);
  57
  58 /******************************************************************************
  59  *
  60  * FUNCTION:    acpi_hw_get_gpe_register_bit
  61  *
  62  * PARAMETERS:  gpe_event_info      - Info block for the GPE
  63  *              gpe_register_info   - Info block for the GPE register
  64  *
  65  * RETURN:      Register mask with a one in the GPE bit position
  66  *
  67  * DESCRIPTION: Compute the register mask for this GPE. One bit is set in the
  68  *              correct position for the input GPE.
  69  *
  70  ******************************************************************************/
  71
  72 u32 acpi_hw_get_gpe_register_bit(struct acpi_gpe_event_info *gpe_event_info,
  73                              struct acpi_gpe_register_info *gpe_register_info)
  74 {
  75         return (u32)1 << (gpe_event_info->gpe_number -
  76                                 gpe_register_info->base_gpe_number);
  77 }
  78
  79 /******************************************************************************
  80  *
  81  * FUNCTION:    acpi_hw_low_set_gpe
  82  *
  83  * PARAMETERS:  gpe_event_info      - Info block for the GPE to be disabled
  84  *              action              - Enable or disable
  85  *
  86  * RETURN:      Status
  87  *
  88  * DESCRIPTION: Enable or disable a single GPE in the parent enable register.
  89  *
  90  ******************************************************************************/
  91
  92 acpi_status
  93 acpi_hw_low_set_gpe(struct acpi_gpe_event_info *gpe_event_info, u32 action)
  94 {
  95         struct acpi_gpe_register_info *gpe_register_info;
  96         acpi_status status;
  97         u32 enable_mask;
  98         u32 register_bit;
  99
 100         ACPI_FUNCTION_ENTRY();
 101
 102         /* Get the info block for the entire GPE register */
 103
 104         gpe_register_info = gpe_event_info->register_info;
 105         if (!gpe_register_info) {
 106                 return (AE_NOT_EXIST);
 107         }
 108
 109         /* Get current value of the enable register that contains this GPE */
 110
 111         status = acpi_hw_read(&enable_mask, &gpe_register_info->enable_address);
 112         if (ACPI_FAILURE(status)) {
 113                 return (status);
 114         }
 115
 116         /* Set or clear just the bit that corresponds to this GPE */
 117
 118         register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info,
 119                                                 gpe_register_info);
 120         switch (action) {
 121         case ACPI_GPE_CONDITIONAL_ENABLE:
 122
 123                 /* Only enable if the enable_for_run bit is set */
 124
 125                 if (!(register_bit & gpe_register_info->enable_for_run)) {
 126                         return (AE_BAD_PARAMETER);
 127                 }
 128
 129                 /*lint -fallthrough */
 130
 131         case ACPI_GPE_ENABLE:
 132                 ACPI_SET_BIT(enable_mask, register_bit);
 133                 break;
 134
 135         case ACPI_GPE_DISABLE:
 136                 ACPI_CLEAR_BIT(enable_mask, register_bit);
 137                 break;
 138
 139         default:
 140                 ACPI_ERROR((AE_INFO, "Invalid GPE Action, %u\n", action));
 141                 return (AE_BAD_PARAMETER);
 142         }
 143
 144         /* Write the updated enable mask */
 145
 146         status = acpi_hw_write(enable_mask, &gpe_register_info->enable_address);
 147         return (status);
 148 }
 149
 150 /******************************************************************************
 151  *
 152  * FUNCTION:    acpi_hw_clear_gpe
 153  *
 154  * PARAMETERS:  gpe_event_info      - Info block for the GPE to be cleared
 155  *
 156  * RETURN:      Status
 157  *
 158  * DESCRIPTION: Clear the status bit for a single GPE.
 159  *
 160  ******************************************************************************/
 161
 162 acpi_status acpi_hw_clear_gpe(struct acpi_gpe_event_info * gpe_event_info)
 163 {
 164         struct acpi_gpe_register_info *gpe_register_info;
 165         acpi_status status;
 166         u32 register_bit;
 167
 168         ACPI_FUNCTION_ENTRY();
 169
 170         /* Get the info block for the entire GPE register */
 171
 172         gpe_register_info = gpe_event_info->register_info;
 173         if (!gpe_register_info) {
 174                 return (AE_NOT_EXIST);
 175         }
 176
 177         /*
 178          * Write a one to the appropriate bit in the status register to
 179          * clear this GPE.
 180          */
 181         register_bit =
 182             acpi_hw_get_gpe_register_bit(gpe_event_info, gpe_register_info);
 183
 184         status = acpi_hw_write(register_bit,
 185                                &gpe_register_info->status_address);
 186
 187         return (status);
 188 }
 189
 190 /******************************************************************************
 191  *
 192  * FUNCTION:    acpi_hw_get_gpe_status
 193  *
 194  * PARAMETERS:  gpe_event_info      - Info block for the GPE to queried
 195  *              event_status        - Where the GPE status is returned
 196  *
 197  * RETURN:      Status
 198  *
 199  * DESCRIPTION: Return the status of a single GPE.
 200  *
 201  ******************************************************************************/
 202
 203 acpi_status
 204 acpi_hw_get_gpe_status(struct acpi_gpe_event_info * gpe_event_info,
 205                        acpi_event_status * event_status)
 206 {
 207         u32 in_byte;
 208         u32 register_bit;
 209         struct acpi_gpe_register_info *gpe_register_info;
 210         acpi_event_status local_event_status = 0;
 211         acpi_status status;
 212
 213         ACPI_FUNCTION_ENTRY();
 214
 215         if (!event_status) {
 216                 return (AE_BAD_PARAMETER);
 217         }
 218
 219         /* Get the info block for the entire GPE register */
 220
 221         gpe_register_info = gpe_event_info->register_info;
 222
 223         /* Get the register bitmask for this GPE */
 224
 225         register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info,
 226                                                 gpe_register_info);
 227
 228         /* GPE currently enabled? (enabled for runtime?) */
 229
 230         if (register_bit & gpe_register_info->enable_for_run) {
 231                 local_event_status |= ACPI_EVENT_FLAG_ENABLED;
 232         }
 233
 234         /* GPE enabled for wake? */
 235
 236         if (register_bit & gpe_register_info->enable_for_wake) {
 237                 local_event_status |= ACPI_EVENT_FLAG_WAKE_ENABLED;
 238         }
 239
 240         /* GPE currently active (status bit == 1)? */
 241
 242         status = acpi_hw_read(&in_byte, &gpe_register_info->status_address);
 243         if (ACPI_FAILURE(status)) {
 244                 return (status);
 245         }
 246
 247         if (register_bit & in_byte) {
 248                 local_event_status |= ACPI_EVENT_FLAG_SET;
 249         }
 250
 251         /* Set return value */
 252
 253         (*event_status) = local_event_status;
 254         return (AE_OK);
 255 }
 256
 257 /******************************************************************************
 258  *
 259  * FUNCTION:    acpi_hw_disable_gpe_block
 260  *
 261  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 262  *              gpe_block           - Gpe Block info
 263  *
 264  * RETURN:      Status
 265  *
 266  * DESCRIPTION: Disable all GPEs within a single GPE block
 267  *
 268  ******************************************************************************/
 269
 270 acpi_status
 271 acpi_hw_disable_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 272                           struct acpi_gpe_block_info *gpe_block, void *context)
 273 {
 274         u32 i;
 275         acpi_status status;
 276
 277         /* Examine each GPE Register within the block */
 278
 279         for (i = 0; i < gpe_block->register_count; i++) {
 280
 281                 /* Disable all GPEs in this register */
 282
 283                 status =
 284                     acpi_hw_write(0x00,
 285                                   &gpe_block->register_info[i].enable_address);
 286                 if (ACPI_FAILURE(status)) {
 287                         return (status);
 288                 }
 289         }
 290
 291         return (AE_OK);
 292 }
 293
 294 /******************************************************************************
 295  *
 296  * FUNCTION:    acpi_hw_clear_gpe_block
 297  *
 298  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 299  *              gpe_block           - Gpe Block info
 300  *
 301  * RETURN:      Status
 302  *
 303  * DESCRIPTION: Clear status bits for all GPEs within a single GPE block
 304  *
 305  ******************************************************************************/
 306
 307 acpi_status
 308 acpi_hw_clear_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 309                         struct acpi_gpe_block_info *gpe_block, void *context)
 310 {
 311         u32 i;
 312         acpi_status status;
 313
 314         /* Examine each GPE Register within the block */
 315
 316         for (i = 0; i < gpe_block->register_count; i++) {
 317
 318                 /* Clear status on all GPEs in this register */
 319
 320                 status =
 321                     acpi_hw_write(0xFF,
 322                                   &gpe_block->register_info[i].status_address);
 323                 if (ACPI_FAILURE(status)) {
 324                         return (status);
 325                 }
 326         }
 327
 328         return (AE_OK);
 329 }
 330
 331 /******************************************************************************
 332  *
 333  * FUNCTION:    acpi_hw_enable_runtime_gpe_block
 334  *
 335  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 336  *              gpe_block           - Gpe Block info
 337  *
 338  * RETURN:      Status
 339  *
 340  * DESCRIPTION: Enable all "runtime" GPEs within a single GPE block. Includes
 341  *              combination wake/run GPEs.
 342  *
 343  ******************************************************************************/
 344
 345 acpi_status
 346 acpi_hw_enable_runtime_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 347                                  struct acpi_gpe_block_info *gpe_block, void *context)
 348 {
 349         u32 i;
 350         acpi_status status;
 351
 352         /* NOTE: assumes that all GPEs are currently disabled */
 353
 354         /* Examine each GPE Register within the block */
 355
 356         for (i = 0; i < gpe_block->register_count; i++) {
 357                 if (!gpe_block->register_info[i].enable_for_run) {
 358                         continue;
 359                 }
 360
 361                 /* Enable all "runtime" GPEs in this register */
 362
 363                 status =
 364                     acpi_hw_write(gpe_block->register_info[i].enable_for_run,
 365                                   &gpe_block->register_info[i].enable_address);
 366                 if (ACPI_FAILURE(status)) {
 367                         return (status);
 368                 }
 369         }
 370
 371         return (AE_OK);
 372 }
 373
 374 /******************************************************************************
 375  *
 376  * FUNCTION:    acpi_hw_enable_wakeup_gpe_block
 377  *
 378  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 379  *              gpe_block           - Gpe Block info
 380  *
 381  * RETURN:      Status
 382  *
 383  * DESCRIPTION: Enable all "wake" GPEs within a single GPE block. Includes
 384  *              combination wake/run GPEs.
 385  *
 386  ******************************************************************************/
 387
 388 static acpi_status
 389 acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 390                                 struct acpi_gpe_block_info *gpe_block,
 391                                 void *context)
 392 {
 393         u32 i;
 394         acpi_status status;
 395
 396         /* Examine each GPE Register within the block */
 397
 398         for (i = 0; i < gpe_block->register_count; i++) {
 399                 if (!gpe_block->register_info[i].enable_for_wake) {
 400                         continue;
 401                 }
 402
 403                 /* Enable all "wake" GPEs in this register */
 404
 405                 status =
 406                     acpi_hw_write(gpe_block->register_info[i].enable_for_wake,
 407                                   &gpe_block->register_info[i].enable_address);
 408                 if (ACPI_FAILURE(status)) {
 409                         return (status);
 410                 }
 411         }
 412
 413         return (AE_OK);
 414 }
 415
 416 /******************************************************************************
 417  *
 418  * FUNCTION:    acpi_hw_disable_all_gpes
 419  *
 420  * PARAMETERS:  None
 421  *
 422  * RETURN:      Status
 423  *
 424  * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 425  *
 426  ******************************************************************************/
 427
 428 acpi_status acpi_hw_disable_all_gpes(void)
 429 {
 430         acpi_status status;
 431
 432         ACPI_FUNCTION_TRACE(hw_disable_all_gpes);
 433
 434         status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block, NULL);
 435         status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block, NULL);
 436         return_ACPI_STATUS(status);
 437 }
 438
 439 /******************************************************************************
 440  *
 441  * FUNCTION:    acpi_hw_enable_all_runtime_gpes
 442  *
 443  * PARAMETERS:  None
 444  *
 445  * RETURN:      Status
 446  *
 447  * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 448  *
 449  ******************************************************************************/
 450
 451 acpi_status acpi_hw_enable_all_runtime_gpes(void)
 452 {
 453         acpi_status status;
 454
 455         ACPI_FUNCTION_TRACE(hw_enable_all_runtime_gpes);
 456
 457         status = acpi_ev_walk_gpe_list(acpi_hw_enable_runtime_gpe_block, NULL);
 458         return_ACPI_STATUS(status);
 459 }
 460
 461 /******************************************************************************
 462  *
 463  * FUNCTION:    acpi_hw_enable_all_wakeup_gpes
 464  *
 465  * PARAMETERS:  None
 466  *
 467  * RETURN:      Status
 468  *
 469  * DESCRIPTION: Enable all "wakeup" GPEs, in all GPE blocks
 470  *
 471  ******************************************************************************/
 472
 473 acpi_status acpi_hw_enable_all_wakeup_gpes(void)
 474 {
 475         acpi_status status;
 476
 477         ACPI_FUNCTION_TRACE(hw_enable_all_wakeup_gpes);
 478
 479         status = acpi_ev_walk_gpe_list(acpi_hw_enable_wakeup_gpe_block, NULL);
 480         return_ACPI_STATUS(status);
 481 }