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 - 2008, 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 <acpi/acevents.h>
  47
  48 #define _COMPONENT          ACPI_HARDWARE
  49 ACPI_MODULE_NAME("hwgpe")
  50
  51 /* Local prototypes */
  52 static acpi_status
  53 acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
  54                                 struct acpi_gpe_block_info *gpe_block);
  55
  56 /******************************************************************************
  57  *
  58  * FUNCTION:    acpi_hw_low_disable_gpe
  59  *
  60  * PARAMETERS:  gpe_event_info      - Info block for the GPE to be disabled
  61  *
  62  * RETURN:      Status
  63  *
  64  * DESCRIPTION: Disable a single GPE in the enable register.
  65  *
  66  ******************************************************************************/
  67
  68 acpi_status acpi_hw_low_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
  69 {
  70         struct acpi_gpe_register_info *gpe_register_info;
  71         acpi_status status;
  72         u32 enable_mask;
  73
  74         /* Get the info block for the entire GPE register */
  75
  76         gpe_register_info = gpe_event_info->register_info;
  77         if (!gpe_register_info) {
  78                 return (AE_NOT_EXIST);
  79         }
  80
  81         /* Get current value of the enable register that contains this GPE */
  82
  83         status = acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH, &enable_mask,
  84                                         &gpe_register_info->enable_address);
  85         if (ACPI_FAILURE(status)) {
  86                 return (status);
  87         }
  88
  89         /* Clear just the bit that corresponds to this GPE */
  90
  91         ACPI_CLEAR_BIT(enable_mask,
  92                        ((u32) 1 <<
  93                         (gpe_event_info->gpe_number -
  94                          gpe_register_info->base_gpe_number)));
  95
  96         /* Write the updated enable mask */
  97
  98         status = acpi_hw_low_level_write(ACPI_GPE_REGISTER_WIDTH, enable_mask,
  99                                          &gpe_register_info->enable_address);
 100
 101         return (status);
 102 }
 103
 104 /******************************************************************************
 105  *
 106  * FUNCTION:    acpi_hw_write_gpe_enable_reg
 107  *
 108  * PARAMETERS:  gpe_event_info      - Info block for the GPE to be enabled
 109  *
 110  * RETURN:      Status
 111  *
 112  * DESCRIPTION: Write a GPE enable register.  Note: The bit for this GPE must
 113  *              already be cleared or set in the parent register
 114  *              enable_for_run mask.
 115  *
 116  ******************************************************************************/
 117
 118 acpi_status
 119 acpi_hw_write_gpe_enable_reg(struct acpi_gpe_event_info * gpe_event_info)
 120 {
 121         struct acpi_gpe_register_info *gpe_register_info;
 122         acpi_status status;
 123
 124         ACPI_FUNCTION_ENTRY();
 125
 126         /* Get the info block for the entire GPE register */
 127
 128         gpe_register_info = gpe_event_info->register_info;
 129         if (!gpe_register_info) {
 130                 return (AE_NOT_EXIST);
 131         }
 132
 133         /* Write the entire GPE (runtime) enable register */
 134
 135         status = acpi_hw_low_level_write(8, gpe_register_info->enable_for_run,
 136                                          &gpe_register_info->enable_address);
 137
 138         return (status);
 139 }
 140
 141 /******************************************************************************
 142  *
 143  * FUNCTION:    acpi_hw_clear_gpe
 144  *
 145  * PARAMETERS:  gpe_event_info      - Info block for the GPE to be cleared
 146  *
 147  * RETURN:      Status
 148  *
 149  * DESCRIPTION: Clear the status bit for a single GPE.
 150  *
 151  ******************************************************************************/
 152
 153 acpi_status acpi_hw_clear_gpe(struct acpi_gpe_event_info * gpe_event_info)
 154 {
 155         acpi_status status;
 156         u8 register_bit;
 157
 158         ACPI_FUNCTION_ENTRY();
 159
 160         register_bit = (u8)
 161             (1 <<
 162              (gpe_event_info->gpe_number -
 163               gpe_event_info->register_info->base_gpe_number));
 164
 165         /*
 166          * Write a one to the appropriate bit in the status register to
 167          * clear this GPE.
 168          */
 169         status = acpi_hw_low_level_write(8, register_bit,
 170                                          &gpe_event_info->register_info->
 171                                          status_address);
 172
 173         return (status);
 174 }
 175
 176 /******************************************************************************
 177  *
 178  * FUNCTION:    acpi_hw_get_gpe_status
 179  *
 180  * PARAMETERS:  gpe_event_info      - Info block for the GPE to queried
 181  *              event_status        - Where the GPE status is returned
 182  *
 183  * RETURN:      Status
 184  *
 185  * DESCRIPTION: Return the status of a single GPE.
 186  *
 187  ******************************************************************************/
 188
 189 acpi_status
 190 acpi_hw_get_gpe_status(struct acpi_gpe_event_info * gpe_event_info,
 191                        acpi_event_status * event_status)
 192 {
 193         u32 in_byte;
 194         u8 register_bit;
 195         struct acpi_gpe_register_info *gpe_register_info;
 196         acpi_status status;
 197         acpi_event_status local_event_status = 0;
 198
 199         ACPI_FUNCTION_ENTRY();
 200
 201         if (!event_status) {
 202                 return (AE_BAD_PARAMETER);
 203         }
 204
 205         /* Get the info block for the entire GPE register */
 206
 207         gpe_register_info = gpe_event_info->register_info;
 208
 209         /* Get the register bitmask for this GPE */
 210
 211         register_bit = (u8)
 212             (1 <<
 213              (gpe_event_info->gpe_number -
 214               gpe_event_info->register_info->base_gpe_number));
 215
 216         /* GPE currently enabled? (enabled for runtime?) */
 217
 218         if (register_bit & gpe_register_info->enable_for_run) {
 219                 local_event_status |= ACPI_EVENT_FLAG_ENABLED;
 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 active (status bit == 1)? */
 229
 230         status =
 231             acpi_hw_low_level_read(8, &in_byte,
 232                                    &gpe_register_info->status_address);
 233         if (ACPI_FAILURE(status)) {
 234                 goto unlock_and_exit;
 235         }
 236
 237         if (register_bit & in_byte) {
 238                 local_event_status |= ACPI_EVENT_FLAG_SET;
 239         }
 240
 241         /* Set return value */
 242
 243         (*event_status) = local_event_status;
 244
 245       unlock_and_exit:
 246         return (status);
 247 }
 248
 249 /******************************************************************************
 250  *
 251  * FUNCTION:    acpi_hw_disable_gpe_block
 252  *
 253  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 254  *              gpe_block           - Gpe Block info
 255  *
 256  * RETURN:      Status
 257  *
 258  * DESCRIPTION: Disable all GPEs within a single GPE block
 259  *
 260  ******************************************************************************/
 261
 262 acpi_status
 263 acpi_hw_disable_gpe_block(struct acpi_gpe_xrupt_info * gpe_xrupt_info,
 264                           struct acpi_gpe_block_info * gpe_block)
 265 {
 266         u32 i;
 267         acpi_status status;
 268
 269         /* Examine each GPE Register within the block */
 270
 271         for (i = 0; i < gpe_block->register_count; i++) {
 272
 273                 /* Disable all GPEs in this register */
 274
 275                 status = acpi_hw_low_level_write(8, 0x00,
 276                                                  &gpe_block->register_info[i].
 277                                                  enable_address);
 278                 if (ACPI_FAILURE(status)) {
 279                         return (status);
 280                 }
 281         }
 282
 283         return (AE_OK);
 284 }
 285
 286 /******************************************************************************
 287  *
 288  * FUNCTION:    acpi_hw_clear_gpe_block
 289  *
 290  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 291  *              gpe_block           - Gpe Block info
 292  *
 293  * RETURN:      Status
 294  *
 295  * DESCRIPTION: Clear status bits for all GPEs within a single GPE block
 296  *
 297  ******************************************************************************/
 298
 299 acpi_status
 300 acpi_hw_clear_gpe_block(struct acpi_gpe_xrupt_info * gpe_xrupt_info,
 301                         struct acpi_gpe_block_info * gpe_block)
 302 {
 303         u32 i;
 304         acpi_status status;
 305
 306         /* Examine each GPE Register within the block */
 307
 308         for (i = 0; i < gpe_block->register_count; i++) {
 309
 310                 /* Clear status on all GPEs in this register */
 311
 312                 status = acpi_hw_low_level_write(8, 0xFF,
 313                                                  &gpe_block->register_info[i].
 314                                                  status_address);
 315                 if (ACPI_FAILURE(status)) {
 316                         return (status);
 317                 }
 318         }
 319
 320         return (AE_OK);
 321 }
 322
 323 /******************************************************************************
 324  *
 325  * FUNCTION:    acpi_hw_enable_runtime_gpe_block
 326  *
 327  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 328  *              gpe_block           - Gpe Block info
 329  *
 330  * RETURN:      Status
 331  *
 332  * DESCRIPTION: Enable all "runtime" GPEs within a single GPE block. Includes
 333  *              combination wake/run GPEs.
 334  *
 335  ******************************************************************************/
 336
 337 acpi_status
 338 acpi_hw_enable_runtime_gpe_block(struct acpi_gpe_xrupt_info * gpe_xrupt_info,
 339                                  struct acpi_gpe_block_info * gpe_block)
 340 {
 341         u32 i;
 342         acpi_status status;
 343
 344         /* NOTE: assumes that all GPEs are currently disabled */
 345
 346         /* Examine each GPE Register within the block */
 347
 348         for (i = 0; i < gpe_block->register_count; i++) {
 349                 if (!gpe_block->register_info[i].enable_for_run) {
 350                         continue;
 351                 }
 352
 353                 /* Enable all "runtime" GPEs in this register */
 354
 355                 status =
 356                     acpi_hw_low_level_write(8,
 357                                             gpe_block->register_info[i].
 358                                             enable_for_run,
 359                                             &gpe_block->register_info[i].
 360                                             enable_address);
 361                 if (ACPI_FAILURE(status)) {
 362                         return (status);
 363                 }
 364         }
 365
 366         return (AE_OK);
 367 }
 368
 369 /******************************************************************************
 370  *
 371  * FUNCTION:    acpi_hw_enable_wakeup_gpe_block
 372  *
 373  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 374  *              gpe_block           - Gpe Block info
 375  *
 376  * RETURN:      Status
 377  *
 378  * DESCRIPTION: Enable all "wake" GPEs within a single GPE block. Includes
 379  *              combination wake/run GPEs.
 380  *
 381  ******************************************************************************/
 382
 383 static acpi_status
 384 acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 385                                 struct acpi_gpe_block_info *gpe_block)
 386 {
 387         u32 i;
 388         acpi_status status;
 389
 390         /* Examine each GPE Register within the block */
 391
 392         for (i = 0; i < gpe_block->register_count; i++) {
 393                 if (!gpe_block->register_info[i].enable_for_wake) {
 394                         continue;
 395                 }
 396
 397                 /* Enable all "wake" GPEs in this register */
 398
 399                 status = acpi_hw_low_level_write(8,
 400                                                  gpe_block->register_info[i].
 401                                                  enable_for_wake,
 402                                                  &gpe_block->register_info[i].
 403                                                  enable_address);
 404                 if (ACPI_FAILURE(status)) {
 405                         return (status);
 406                 }
 407         }
 408
 409         return (AE_OK);
 410 }
 411
 412 /******************************************************************************
 413  *
 414  * FUNCTION:    acpi_hw_disable_all_gpes
 415  *
 416  * PARAMETERS:  None
 417  *
 418  * RETURN:      Status
 419  *
 420  * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 421  *
 422  ******************************************************************************/
 423
 424 acpi_status acpi_hw_disable_all_gpes(void)
 425 {
 426         acpi_status status;
 427
 428         ACPI_FUNCTION_TRACE(hw_disable_all_gpes);
 429
 430         status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block);
 431         status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block);
 432         return_ACPI_STATUS(status);
 433 }
 434
 435 /******************************************************************************
 436  *
 437  * FUNCTION:    acpi_hw_enable_all_runtime_gpes
 438  *
 439  * PARAMETERS:  None
 440  *
 441  * RETURN:      Status
 442  *
 443  * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 444  *
 445  ******************************************************************************/
 446
 447 acpi_status acpi_hw_enable_all_runtime_gpes(void)
 448 {
 449         acpi_status status;
 450
 451         ACPI_FUNCTION_TRACE(hw_enable_all_runtime_gpes);
 452
 453         status = acpi_ev_walk_gpe_list(acpi_hw_enable_runtime_gpe_block);
 454         return_ACPI_STATUS(status);
 455 }
 456
 457 /******************************************************************************
 458  *
 459  * FUNCTION:    acpi_hw_enable_all_wakeup_gpes
 460  *
 461  * PARAMETERS:  None
 462  *
 463  * RETURN:      Status
 464  *
 465  * DESCRIPTION: Enable all "wakeup" GPEs, in all GPE blocks
 466  *
 467  ******************************************************************************/
 468
 469 acpi_status acpi_hw_enable_all_wakeup_gpes(void)
 470 {
 471         acpi_status status;
 472
 473         ACPI_FUNCTION_TRACE(hw_enable_all_wakeup_gpes);
 474
 475         status = acpi_ev_walk_gpe_list(acpi_hw_enable_wakeup_gpe_block);
 476         return_ACPI_STATUS(status);
 477 }