drivers/acpi/hardware/hwgpe.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: hwgpe - Low level GPE enable/disable/clear functions
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2005, R. Byron Moore
  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 <acpi/acevents.h>
  47
  48 #define _COMPONENT          ACPI_HARDWARE
  49          ACPI_MODULE_NAME    ("hwgpe")
  50
  51
  52 /******************************************************************************
  53  *
  54  * FUNCTION:    acpi_hw_write_gpe_enable_reg
  55  *
  56  * PARAMETERS:  gpe_event_info      - Info block for the GPE to be enabled
  57  *
  58  * RETURN:      Status
  59  *
  60  * DESCRIPTION: Write a GPE enable register.  Note: The bit for this GPE must
  61  *              already be cleared or set in the parent register
  62  *              enable_for_run mask.
  63  *
  64  ******************************************************************************/
  65
  66 acpi_status
  67 acpi_hw_write_gpe_enable_reg (
  68         struct acpi_gpe_event_info      *gpe_event_info)
  69 {
  70         struct acpi_gpe_register_info   *gpe_register_info;
  71         acpi_status                     status;
  72
  73
  74         ACPI_FUNCTION_ENTRY ();
  75
  76
  77         /* Get the info block for the entire GPE register */
  78
  79         gpe_register_info = gpe_event_info->register_info;
  80         if (!gpe_register_info) {
  81                 return (AE_NOT_EXIST);
  82         }
  83
  84         /* Write the entire GPE (runtime) enable register */
  85
  86         status = acpi_hw_low_level_write (8, gpe_register_info->enable_for_run,
  87                           &gpe_register_info->enable_address);
  88
  89         return (status);
  90 }
  91
  92
  93 /******************************************************************************
  94  *
  95  * FUNCTION:    acpi_hw_clear_gpe
  96  *
  97  * PARAMETERS:  gpe_event_info      - Info block for the GPE to be cleared
  98  *
  99  * RETURN:      Status
 100  *
 101  * DESCRIPTION: Clear the status bit for a single GPE.
 102  *
 103  ******************************************************************************/
 104
 105 acpi_status
 106 acpi_hw_clear_gpe (
 107         struct acpi_gpe_event_info      *gpe_event_info)
 108 {
 109         acpi_status                     status;
 110
 111
 112         ACPI_FUNCTION_ENTRY ();
 113
 114
 115         /*
 116          * Write a one to the appropriate bit in the status register to
 117          * clear this GPE.
 118          */
 119         status = acpi_hw_low_level_write (8, gpe_event_info->register_bit,
 120                           &gpe_event_info->register_info->status_address);
 121
 122         return (status);
 123 }
 124
 125
 126 /******************************************************************************
 127  *
 128  * FUNCTION:    acpi_hw_get_gpe_status
 129  *
 130  * PARAMETERS:  gpe_event_info      - Info block for the GPE to queried
 131  *              event_status        - Where the GPE status is returned
 132  *
 133  * RETURN:      Status
 134  *
 135  * DESCRIPTION: Return the status of a single GPE.
 136  *
 137  ******************************************************************************/
 138 #ifdef ACPI_FUTURE_USAGE
 139 acpi_status
 140 acpi_hw_get_gpe_status (
 141         struct acpi_gpe_event_info      *gpe_event_info,
 142         acpi_event_status               *event_status)
 143 {
 144         u32                             in_byte;
 145         u8                              register_bit;
 146         struct acpi_gpe_register_info   *gpe_register_info;
 147         acpi_status                     status;
 148         acpi_event_status               local_event_status = 0;
 149
 150
 151         ACPI_FUNCTION_ENTRY ();
 152
 153
 154         if (!event_status) {
 155                 return (AE_BAD_PARAMETER);
 156         }
 157
 158         /* Get the info block for the entire GPE register */
 159
 160         gpe_register_info = gpe_event_info->register_info;
 161
 162         /* Get the register bitmask for this GPE */
 163
 164         register_bit = gpe_event_info->register_bit;
 165
 166         /* GPE currently enabled? (enabled for runtime?) */
 167
 168         if (register_bit & gpe_register_info->enable_for_run) {
 169                 local_event_status |= ACPI_EVENT_FLAG_ENABLED;
 170         }
 171
 172         /* GPE enabled for wake? */
 173
 174         if (register_bit & gpe_register_info->enable_for_wake) {
 175                 local_event_status |= ACPI_EVENT_FLAG_WAKE_ENABLED;
 176         }
 177
 178         /* GPE currently active (status bit == 1)? */
 179
 180         status = acpi_hw_low_level_read (8, &in_byte, &gpe_register_info->status_address);
 181         if (ACPI_FAILURE (status)) {
 182                 goto unlock_and_exit;
 183         }
 184
 185         if (register_bit & in_byte) {
 186                 local_event_status |= ACPI_EVENT_FLAG_SET;
 187         }
 188
 189         /* Set return value */
 190
 191         (*event_status) = local_event_status;
 192
 193
 194 unlock_and_exit:
 195         return (status);
 196 }
 197 #endif  /*  ACPI_FUTURE_USAGE  */
 198
 199
 200 /******************************************************************************
 201  *
 202  * FUNCTION:    acpi_hw_disable_gpe_block
 203  *
 204  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 205  *              gpe_block           - Gpe Block info
 206  *
 207  * RETURN:      Status
 208  *
 209  * DESCRIPTION: Disable all GPEs within a GPE block
 210  *
 211  ******************************************************************************/
 212
 213 acpi_status
 214 acpi_hw_disable_gpe_block (
 215         struct acpi_gpe_xrupt_info      *gpe_xrupt_info,
 216         struct acpi_gpe_block_info      *gpe_block)
 217 {
 218         u32                             i;
 219         acpi_status                     status;
 220
 221
 222         /* Examine each GPE Register within the block */
 223
 224         for (i = 0; i < gpe_block->register_count; i++) {
 225                 /* Disable all GPEs in this register */
 226
 227                 status = acpi_hw_low_level_write (8, 0x00,
 228                                  &gpe_block->register_info[i].enable_address);
 229                 if (ACPI_FAILURE (status)) {
 230                         return (status);
 231                 }
 232         }
 233
 234         return (AE_OK);
 235 }
 236
 237
 238 /******************************************************************************
 239  *
 240  * FUNCTION:    acpi_hw_clear_gpe_block
 241  *
 242  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 243  *              gpe_block           - Gpe Block info
 244  *
 245  * RETURN:      Status
 246  *
 247  * DESCRIPTION: Clear status bits for all GPEs within a GPE block
 248  *
 249  ******************************************************************************/
 250
 251 acpi_status
 252 acpi_hw_clear_gpe_block (
 253         struct acpi_gpe_xrupt_info      *gpe_xrupt_info,
 254         struct acpi_gpe_block_info      *gpe_block)
 255 {
 256         u32                             i;
 257         acpi_status                     status;
 258
 259
 260         /* Examine each GPE Register within the block */
 261
 262         for (i = 0; i < gpe_block->register_count; i++) {
 263                 /* Clear status on all GPEs in this register */
 264
 265                 status = acpi_hw_low_level_write (8, 0xFF,
 266                                  &gpe_block->register_info[i].status_address);
 267                 if (ACPI_FAILURE (status)) {
 268                         return (status);
 269                 }
 270         }
 271
 272         return (AE_OK);
 273 }
 274
 275
 276 /******************************************************************************
 277  *
 278  * FUNCTION:    acpi_hw_enable_runtime_gpe_block
 279  *
 280  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 281  *              gpe_block           - Gpe Block info
 282  *
 283  * RETURN:      Status
 284  *
 285  * DESCRIPTION: Enable all "runtime" GPEs within a GPE block. (Includes
 286  *              combination wake/run GPEs.)
 287  *
 288  ******************************************************************************/
 289
 290 acpi_status
 291 acpi_hw_enable_runtime_gpe_block (
 292         struct acpi_gpe_xrupt_info      *gpe_xrupt_info,
 293         struct acpi_gpe_block_info      *gpe_block)
 294 {
 295         u32                             i;
 296         acpi_status                     status;
 297
 298
 299         /* NOTE: assumes that all GPEs are currently disabled */
 300
 301         /* Examine each GPE Register within the block */
 302
 303         for (i = 0; i < gpe_block->register_count; i++) {
 304                 if (!gpe_block->register_info[i].enable_for_run) {
 305                         continue;
 306                 }
 307
 308                 /* Enable all "runtime" GPEs in this register */
 309
 310                 status = acpi_hw_low_level_write (8, gpe_block->register_info[i].enable_for_run,
 311                                  &gpe_block->register_info[i].enable_address);
 312                 if (ACPI_FAILURE (status)) {
 313                         return (status);
 314                 }
 315         }
 316
 317         return (AE_OK);
 318 }
 319
 320
 321 /******************************************************************************
 322  *
 323  * FUNCTION:    acpi_hw_enable_wakeup_gpe_block
 324  *
 325  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 326  *              gpe_block           - Gpe Block info
 327  *
 328  * RETURN:      Status
 329  *
 330  * DESCRIPTION: Enable all "wake" GPEs within a GPE block.  (Includes
 331  *              combination wake/run GPEs.)
 332  *
 333  ******************************************************************************/
 334
 335 acpi_status
 336 acpi_hw_enable_wakeup_gpe_block (
 337         struct acpi_gpe_xrupt_info      *gpe_xrupt_info,
 338         struct acpi_gpe_block_info      *gpe_block)
 339 {
 340         u32                             i;
 341         acpi_status                     status;
 342
 343
 344         /* Examine each GPE Register within the block */
 345
 346         for (i = 0; i < gpe_block->register_count; i++) {
 347                 if (!gpe_block->register_info[i].enable_for_wake) {
 348                         continue;
 349                 }
 350
 351                 /* Enable all "wake" GPEs in this register */
 352
 353                 status = acpi_hw_low_level_write (8, gpe_block->register_info[i].enable_for_wake,
 354                                  &gpe_block->register_info[i].enable_address);
 355                 if (ACPI_FAILURE (status)) {
 356                         return (status);
 357                 }
 358         }
 359
 360         return (AE_OK);
 361 }
 362
 363
 364 /******************************************************************************
 365  *
 366  * FUNCTION:    acpi_hw_disable_all_gpes
 367  *
 368  * PARAMETERS:  Flags           - ACPI_NOT_ISR or ACPI_ISR
 369  *
 370  * RETURN:      Status
 371  *
 372  * DESCRIPTION: Disable and clear all GPEs
 373  *
 374  ******************************************************************************/
 375
 376 acpi_status
 377 acpi_hw_disable_all_gpes (
 378         u32                             flags)
 379 {
 380         acpi_status                     status;
 381
 382
 383         ACPI_FUNCTION_TRACE ("hw_disable_all_gpes");
 384
 385
 386         status = acpi_ev_walk_gpe_list (acpi_hw_disable_gpe_block, flags);
 387         status = acpi_ev_walk_gpe_list (acpi_hw_clear_gpe_block, flags);
 388         return_ACPI_STATUS (status);
 389 }
 390
 391
 392 /******************************************************************************
 393  *
 394  * FUNCTION:    acpi_hw_enable_all_runtime_gpes
 395  *
 396  * PARAMETERS:  Flags           - ACPI_NOT_ISR or ACPI_ISR
 397  *
 398  * RETURN:      Status
 399  *
 400  * DESCRIPTION: Enable all GPEs of the given type
 401  *
 402  ******************************************************************************/
 403
 404 acpi_status
 405 acpi_hw_enable_all_runtime_gpes (
 406         u32                             flags)
 407 {
 408         acpi_status                     status;
 409
 410
 411         ACPI_FUNCTION_TRACE ("hw_enable_all_runtime_gpes");
 412
 413
 414         status = acpi_ev_walk_gpe_list (acpi_hw_enable_runtime_gpe_block, flags);
 415         return_ACPI_STATUS (status);
 416 }
 417
 418
 419 /******************************************************************************
 420  *
 421  * FUNCTION:    acpi_hw_enable_all_wakeup_gpes
 422  *
 423  * PARAMETERS:  Flags           - ACPI_NOT_ISR or ACPI_ISR
 424  *
 425  * RETURN:      Status
 426  *
 427  * DESCRIPTION: Enable all GPEs of the given type
 428  *
 429  ******************************************************************************/
 430
 431 acpi_status
 432 acpi_hw_enable_all_wakeup_gpes (
 433         u32                             flags)
 434 {
 435         acpi_status                     status;
 436
 437
 438         ACPI_FUNCTION_TRACE ("hw_enable_all_wakeup_gpes");
 439
 440
 441         status = acpi_ev_walk_gpe_list (acpi_hw_enable_wakeup_gpe_block, flags);
 442         return_ACPI_STATUS (status);
 443 }
 444