drivers/acpi/acpica/hwgpe.c

   1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2 /******************************************************************************
   3  *
   4  * Module Name: hwgpe - Low level GPE enable/disable/clear functions
   5  *
   6  * Copyright (C) 2000 - 2020, Intel Corp.
   7  *
   8  *****************************************************************************/
   9
  10 #include <acpi/acpi.h>
  11 #include "accommon.h"
  12 #include "acevents.h"
  13
  14 #define _COMPONENT          ACPI_HARDWARE
  15 ACPI_MODULE_NAME("hwgpe")
  16 #if (!ACPI_REDUCED_HARDWARE)    /* Entire module */
  17 /* Local prototypes */
  18 static acpi_status
  19 acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
  20                                 struct acpi_gpe_block_info *gpe_block,
  21                                 void *context);
  22
  23 static acpi_status
  24 acpi_hw_gpe_enable_write(u8 enable_mask,
  25                          struct acpi_gpe_register_info *gpe_register_info);
  26
  27 /******************************************************************************
  28  *
  29  * FUNCTION:    acpi_hw_get_gpe_register_bit
  30  *
  31  * PARAMETERS:  gpe_event_info      - Info block for the GPE
  32  *
  33  * RETURN:      Register mask with a one in the GPE bit position
  34  *
  35  * DESCRIPTION: Compute the register mask for this GPE. One bit is set in the
  36  *              correct position for the input GPE.
  37  *
  38  ******************************************************************************/
  39
  40 u32 acpi_hw_get_gpe_register_bit(struct acpi_gpe_event_info *gpe_event_info)
  41 {
  42
  43         return ((u32)1 <<
  44                 (gpe_event_info->gpe_number -
  45                  gpe_event_info->register_info->base_gpe_number));
  46 }
  47
  48 /******************************************************************************
  49  *
  50  * FUNCTION:    acpi_hw_low_set_gpe
  51  *
  52  * PARAMETERS:  gpe_event_info      - Info block for the GPE to be disabled
  53  *              action              - Enable or disable
  54  *
  55  * RETURN:      Status
  56  *
  57  * DESCRIPTION: Enable or disable a single GPE in the parent enable register.
  58  *              The enable_mask field of the involved GPE register must be
  59  *              updated by the caller if necessary.
  60  *
  61  ******************************************************************************/
  62
  63 acpi_status
  64 acpi_hw_low_set_gpe(struct acpi_gpe_event_info *gpe_event_info, u32 action)
  65 {
  66         struct acpi_gpe_register_info *gpe_register_info;
  67         acpi_status status = AE_OK;
  68         u64 enable_mask;
  69         u32 register_bit;
  70
  71         ACPI_FUNCTION_ENTRY();
  72
  73         /* Get the info block for the entire GPE register */
  74
  75         gpe_register_info = gpe_event_info->register_info;
  76         if (!gpe_register_info) {
  77                 return (AE_NOT_EXIST);
  78         }
  79
  80         /* Get current value of the enable register that contains this GPE */
  81
  82         status = acpi_hw_read(&enable_mask, &gpe_register_info->enable_address);
  83         if (ACPI_FAILURE(status)) {
  84                 return (status);
  85         }
  86
  87         /* Set or clear just the bit that corresponds to this GPE */
  88
  89         register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);
  90         switch (action) {
  91         case ACPI_GPE_CONDITIONAL_ENABLE:
  92
  93                 /* Only enable if the corresponding enable_mask bit is set */
  94
  95                 if (!(register_bit & gpe_register_info->enable_mask)) {
  96                         return (AE_BAD_PARAMETER);
  97                 }
  98
  99                 /*lint -fallthrough */
 100
 101         case ACPI_GPE_ENABLE:
 102
 103                 ACPI_SET_BIT(enable_mask, register_bit);
 104                 break;
 105
 106         case ACPI_GPE_DISABLE:
 107
 108                 ACPI_CLEAR_BIT(enable_mask, register_bit);
 109                 break;
 110
 111         default:
 112
 113                 ACPI_ERROR((AE_INFO, "Invalid GPE Action, %u", action));
 114                 return (AE_BAD_PARAMETER);
 115         }
 116
 117         if (!(register_bit & gpe_register_info->mask_for_run)) {
 118
 119                 /* Write the updated enable mask */
 120
 121                 status =
 122                     acpi_hw_write(enable_mask,
 123                                   &gpe_register_info->enable_address);
 124         }
 125         return (status);
 126 }
 127
 128 /******************************************************************************
 129  *
 130  * FUNCTION:    acpi_hw_clear_gpe
 131  *
 132  * PARAMETERS:  gpe_event_info      - Info block for the GPE to be cleared
 133  *
 134  * RETURN:      Status
 135  *
 136  * DESCRIPTION: Clear the status bit for a single GPE.
 137  *
 138  ******************************************************************************/
 139
 140 acpi_status acpi_hw_clear_gpe(struct acpi_gpe_event_info *gpe_event_info)
 141 {
 142         struct acpi_gpe_register_info *gpe_register_info;
 143         acpi_status status;
 144         u32 register_bit;
 145
 146         ACPI_FUNCTION_ENTRY();
 147
 148         /* Get the info block for the entire GPE register */
 149
 150         gpe_register_info = gpe_event_info->register_info;
 151         if (!gpe_register_info) {
 152                 return (AE_NOT_EXIST);
 153         }
 154
 155         /*
 156          * Write a one to the appropriate bit in the status register to
 157          * clear this GPE.
 158          */
 159         register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);
 160
 161         status =
 162             acpi_hw_write(register_bit, &gpe_register_info->status_address);
 163         return (status);
 164 }
 165
 166 /******************************************************************************
 167  *
 168  * FUNCTION:    acpi_hw_get_gpe_status
 169  *
 170  * PARAMETERS:  gpe_event_info      - Info block for the GPE to queried
 171  *              event_status        - Where the GPE status is returned
 172  *
 173  * RETURN:      Status
 174  *
 175  * DESCRIPTION: Return the status of a single GPE.
 176  *
 177  ******************************************************************************/
 178
 179 acpi_status
 180 acpi_hw_get_gpe_status(struct acpi_gpe_event_info *gpe_event_info,
 181                        acpi_event_status *event_status)
 182 {
 183         u64 in_byte;
 184         u32 register_bit;
 185         struct acpi_gpe_register_info *gpe_register_info;
 186         acpi_event_status local_event_status = 0;
 187         acpi_status status;
 188
 189         ACPI_FUNCTION_ENTRY();
 190
 191         if (!event_status) {
 192                 return (AE_BAD_PARAMETER);
 193         }
 194
 195         /* GPE currently handled? */
 196
 197         if (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) !=
 198             ACPI_GPE_DISPATCH_NONE) {
 199                 local_event_status |= ACPI_EVENT_FLAG_HAS_HANDLER;
 200         }
 201
 202         /* Get the info block for the entire GPE register */
 203
 204         gpe_register_info = gpe_event_info->register_info;
 205
 206         /* Get the register bitmask for this GPE */
 207
 208         register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);
 209
 210         /* GPE currently enabled? (enabled for runtime?) */
 211
 212         if (register_bit & gpe_register_info->enable_for_run) {
 213                 local_event_status |= ACPI_EVENT_FLAG_ENABLED;
 214         }
 215
 216         /* GPE currently masked? (masked for runtime?) */
 217
 218         if (register_bit & gpe_register_info->mask_for_run) {
 219                 local_event_status |= ACPI_EVENT_FLAG_MASKED;
 220         }
 221
 222         /* GPE enabled for wake? */
 223
 224         if (register_bit & gpe_register_info->enable_for_wake) {
 225                 local_event_status |= ACPI_EVENT_FLAG_WAKE_ENABLED;
 226         }
 227
 228         /* GPE currently enabled (enable bit == 1)? */
 229
 230         status = acpi_hw_read(&in_byte, &gpe_register_info->enable_address);
 231         if (ACPI_FAILURE(status)) {
 232                 return (status);
 233         }
 234
 235         if (register_bit & in_byte) {
 236                 local_event_status |= ACPI_EVENT_FLAG_ENABLE_SET;
 237         }
 238
 239         /* GPE currently active (status bit == 1)? */
 240
 241         status = acpi_hw_read(&in_byte, &gpe_register_info->status_address);
 242         if (ACPI_FAILURE(status)) {
 243                 return (status);
 244         }
 245
 246         if (register_bit & in_byte) {
 247                 local_event_status |= ACPI_EVENT_FLAG_STATUS_SET;
 248         }
 249
 250         /* Set return value */
 251
 252         (*event_status) = local_event_status;
 253         return (AE_OK);
 254 }
 255
 256 /******************************************************************************
 257  *
 258  * FUNCTION:    acpi_hw_gpe_enable_write
 259  *
 260  * PARAMETERS:  enable_mask         - Bit mask to write to the GPE register
 261  *              gpe_register_info   - Gpe Register info
 262  *
 263  * RETURN:      Status
 264  *
 265  * DESCRIPTION: Write the enable mask byte to the given GPE register.
 266  *
 267  ******************************************************************************/
 268
 269 static acpi_status
 270 acpi_hw_gpe_enable_write(u8 enable_mask,
 271                          struct acpi_gpe_register_info *gpe_register_info)
 272 {
 273         acpi_status status;
 274
 275         gpe_register_info->enable_mask = enable_mask;
 276
 277         status = acpi_hw_write(enable_mask, &gpe_register_info->enable_address);
 278         return (status);
 279 }
 280
 281 /******************************************************************************
 282  *
 283  * FUNCTION:    acpi_hw_disable_gpe_block
 284  *
 285  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 286  *              gpe_block           - Gpe Block info
 287  *
 288  * RETURN:      Status
 289  *
 290  * DESCRIPTION: Disable all GPEs within a single GPE block
 291  *
 292  ******************************************************************************/
 293
 294 acpi_status
 295 acpi_hw_disable_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 296                           struct acpi_gpe_block_info *gpe_block, void *context)
 297 {
 298         u32 i;
 299         acpi_status status;
 300
 301         /* Examine each GPE Register within the block */
 302
 303         for (i = 0; i < gpe_block->register_count; i++) {
 304
 305                 /* Disable all GPEs in this register */
 306
 307                 status =
 308                     acpi_hw_gpe_enable_write(0x00,
 309                                              &gpe_block->register_info[i]);
 310                 if (ACPI_FAILURE(status)) {
 311                         return (status);
 312                 }
 313         }
 314
 315         return (AE_OK);
 316 }
 317
 318 /******************************************************************************
 319  *
 320  * FUNCTION:    acpi_hw_clear_gpe_block
 321  *
 322  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 323  *              gpe_block           - Gpe Block info
 324  *
 325  * RETURN:      Status
 326  *
 327  * DESCRIPTION: Clear status bits for all GPEs within a single GPE block
 328  *
 329  ******************************************************************************/
 330
 331 acpi_status
 332 acpi_hw_clear_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 333                         struct acpi_gpe_block_info *gpe_block, void *context)
 334 {
 335         u32 i;
 336         acpi_status status;
 337
 338         /* Examine each GPE Register within the block */
 339
 340         for (i = 0; i < gpe_block->register_count; i++) {
 341
 342                 /* Clear status on all GPEs in this register */
 343
 344                 status =
 345                     acpi_hw_write(0xFF,
 346                                   &gpe_block->register_info[i].status_address);
 347                 if (ACPI_FAILURE(status)) {
 348                         return (status);
 349                 }
 350         }
 351
 352         return (AE_OK);
 353 }
 354
 355 /******************************************************************************
 356  *
 357  * FUNCTION:    acpi_hw_enable_runtime_gpe_block
 358  *
 359  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 360  *              gpe_block           - Gpe Block info
 361  *
 362  * RETURN:      Status
 363  *
 364  * DESCRIPTION: Enable all "runtime" GPEs within a single GPE block. Includes
 365  *              combination wake/run GPEs.
 366  *
 367  ******************************************************************************/
 368
 369 acpi_status
 370 acpi_hw_enable_runtime_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 371                                  struct acpi_gpe_block_info *gpe_block,
 372                                  void *context)
 373 {
 374         u32 i;
 375         acpi_status status;
 376         struct acpi_gpe_register_info *gpe_register_info;
 377         u8 enable_mask;
 378
 379         /* NOTE: assumes that all GPEs are currently disabled */
 380
 381         /* Examine each GPE Register within the block */
 382
 383         for (i = 0; i < gpe_block->register_count; i++) {
 384                 gpe_register_info = &gpe_block->register_info[i];
 385                 if (!gpe_register_info->enable_for_run) {
 386                         continue;
 387                 }
 388
 389                 /* Enable all "runtime" GPEs in this register */
 390
 391                 enable_mask = gpe_register_info->enable_for_run &
 392                     ~gpe_register_info->mask_for_run;
 393                 status =
 394                     acpi_hw_gpe_enable_write(enable_mask, gpe_register_info);
 395                 if (ACPI_FAILURE(status)) {
 396                         return (status);
 397                 }
 398         }
 399
 400         return (AE_OK);
 401 }
 402
 403 /******************************************************************************
 404  *
 405  * FUNCTION:    acpi_hw_enable_wakeup_gpe_block
 406  *
 407  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 408  *              gpe_block           - Gpe Block info
 409  *
 410  * RETURN:      Status
 411  *
 412  * DESCRIPTION: Enable all "wake" GPEs within a single GPE block. Includes
 413  *              combination wake/run GPEs.
 414  *
 415  ******************************************************************************/
 416
 417 static acpi_status
 418 acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 419                                 struct acpi_gpe_block_info *gpe_block,
 420                                 void *context)
 421 {
 422         u32 i;
 423         acpi_status status;
 424         struct acpi_gpe_register_info *gpe_register_info;
 425
 426         /* Examine each GPE Register within the block */
 427
 428         for (i = 0; i < gpe_block->register_count; i++) {
 429                 gpe_register_info = &gpe_block->register_info[i];
 430
 431                 /*
 432                  * Enable all "wake" GPEs in this register and disable the
 433                  * remaining ones.
 434                  */
 435
 436                 status =
 437                     acpi_hw_gpe_enable_write(gpe_register_info->enable_for_wake,
 438                                              gpe_register_info);
 439                 if (ACPI_FAILURE(status)) {
 440                         return (status);
 441                 }
 442         }
 443
 444         return (AE_OK);
 445 }
 446
 447 /******************************************************************************
 448  *
 449  * FUNCTION:    acpi_hw_disable_all_gpes
 450  *
 451  * PARAMETERS:  None
 452  *
 453  * RETURN:      Status
 454  *
 455  * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 456  *
 457  ******************************************************************************/
 458
 459 acpi_status acpi_hw_disable_all_gpes(void)
 460 {
 461         acpi_status status;
 462
 463         ACPI_FUNCTION_TRACE(hw_disable_all_gpes);
 464
 465         status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block, NULL);
 466         return_ACPI_STATUS(status);
 467 }
 468
 469 /******************************************************************************
 470  *
 471  * FUNCTION:    acpi_hw_enable_all_runtime_gpes
 472  *
 473  * PARAMETERS:  None
 474  *
 475  * RETURN:      Status
 476  *
 477  * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 478  *
 479  ******************************************************************************/
 480
 481 acpi_status acpi_hw_enable_all_runtime_gpes(void)
 482 {
 483         acpi_status status;
 484
 485         ACPI_FUNCTION_TRACE(hw_enable_all_runtime_gpes);
 486
 487         status = acpi_ev_walk_gpe_list(acpi_hw_enable_runtime_gpe_block, NULL);
 488         return_ACPI_STATUS(status);
 489 }
 490
 491 /******************************************************************************
 492  *
 493  * FUNCTION:    acpi_hw_enable_all_wakeup_gpes
 494  *
 495  * PARAMETERS:  None
 496  *
 497  * RETURN:      Status
 498  *
 499  * DESCRIPTION: Enable all "wakeup" GPEs, in all GPE blocks
 500  *
 501  ******************************************************************************/
 502
 503 acpi_status acpi_hw_enable_all_wakeup_gpes(void)
 504 {
 505         acpi_status status;
 506
 507         ACPI_FUNCTION_TRACE(hw_enable_all_wakeup_gpes);
 508
 509         status = acpi_ev_walk_gpe_list(acpi_hw_enable_wakeup_gpe_block, NULL);
 510         return_ACPI_STATUS(status);
 511 }
 512
 513 #endif                          /* !ACPI_REDUCED_HARDWARE */