release/src-rt-6.x.4708/linux/linux-2.6.36/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:      Status
  66  *
  67  * DESCRIPTION: Compute GPE enable mask with one bit corresponding to the given
  68  *              GPE set.
  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 its enable register.
  89  *
  90  ******************************************************************************/
  91
  92 acpi_status
  93 acpi_hw_low_set_gpe(struct acpi_gpe_event_info *gpe_event_info, u8 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 ot 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_COND_ENABLE:
 122                 if (!(register_bit & gpe_register_info->enable_for_run))
 123                         return (AE_BAD_PARAMETER);
 124
 125         case ACPI_GPE_ENABLE:
 126                 ACPI_SET_BIT(enable_mask, register_bit);
 127                 break;
 128
 129         case ACPI_GPE_DISABLE:
 130                 ACPI_CLEAR_BIT(enable_mask, register_bit);
 131                 break;
 132
 133         default:
 134                 ACPI_ERROR((AE_INFO, "Invalid action\n"));
 135                 return (AE_BAD_PARAMETER);
 136         }
 137
 138         /* Write the updated enable mask */
 139
 140         status = acpi_hw_write(enable_mask, &gpe_register_info->enable_address);
 141         return (status);
 142 }
 143
 144 /******************************************************************************
 145  *
 146  * FUNCTION:    acpi_hw_clear_gpe
 147  *
 148  * PARAMETERS:  gpe_event_info      - Info block for the GPE to be cleared
 149  *
 150  * RETURN:      Status
 151  *
 152  * DESCRIPTION: Clear the status bit for a single GPE.
 153  *
 154  ******************************************************************************/
 155
 156 acpi_status acpi_hw_clear_gpe(struct acpi_gpe_event_info * gpe_event_info)
 157 {
 158         struct acpi_gpe_register_info *gpe_register_info;
 159         acpi_status status;
 160         u32 register_bit;
 161
 162         ACPI_FUNCTION_ENTRY();
 163
 164         /* Get the info block for the entire GPE register */
 165
 166         gpe_register_info = gpe_event_info->register_info;
 167         if (!gpe_register_info) {
 168                 return (AE_NOT_EXIST);
 169         }
 170
 171         register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info,
 172                                                 gpe_register_info);
 173
 174         /*
 175          * Write a one to the appropriate bit in the status register to
 176          * clear this GPE.
 177          */
 178         status = acpi_hw_write(register_bit,
 179                                &gpe_register_info->status_address);
 180
 181         return (status);
 182 }
 183
 184 /******************************************************************************
 185  *
 186  * FUNCTION:    acpi_hw_get_gpe_status
 187  *
 188  * PARAMETERS:  gpe_event_info      - Info block for the GPE to queried
 189  *              event_status        - Where the GPE status is returned
 190  *
 191  * RETURN:      Status
 192  *
 193  * DESCRIPTION: Return the status of a single GPE.
 194  *
 195  ******************************************************************************/
 196
 197 acpi_status
 198 acpi_hw_get_gpe_status(struct acpi_gpe_event_info * gpe_event_info,
 199                        acpi_event_status * event_status)
 200 {
 201         u32 in_byte;
 202         u32 register_bit;
 203         struct acpi_gpe_register_info *gpe_register_info;
 204         acpi_status status;
 205         acpi_event_status local_event_status = 0;
 206
 207         ACPI_FUNCTION_ENTRY();
 208
 209         if (!event_status) {
 210                 return (AE_BAD_PARAMETER);
 211         }
 212
 213         /* Get the info block for the entire GPE register */
 214
 215         gpe_register_info = gpe_event_info->register_info;
 216
 217         /* Get the register bitmask for this GPE */
 218
 219         register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info,
 220                                                 gpe_register_info);
 221
 222         /* GPE currently enabled? (enabled for runtime?) */
 223
 224         if (register_bit & gpe_register_info->enable_for_run) {
 225                 local_event_status |= ACPI_EVENT_FLAG_ENABLED;
 226         }
 227
 228         /* GPE enabled for wake? */
 229
 230         if (register_bit & gpe_register_info->enable_for_wake) {
 231                 local_event_status |= ACPI_EVENT_FLAG_WAKE_ENABLED;
 232         }
 233
 234         /* GPE currently active (status bit == 1)? */
 235
 236         status = acpi_hw_read(&in_byte, &gpe_register_info->status_address);
 237         if (ACPI_FAILURE(status)) {
 238                 return (status);
 239         }
 240
 241         if (register_bit & in_byte) {
 242                 local_event_status |= ACPI_EVENT_FLAG_SET;
 243         }
 244
 245         /* Set return value */
 246
 247         (*event_status) = local_event_status;
 248         return (AE_OK);
 249 }
 250
 251 /******************************************************************************
 252  *
 253  * FUNCTION:    acpi_hw_disable_gpe_block
 254  *
 255  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 256  *              gpe_block           - Gpe Block info
 257  *
 258  * RETURN:      Status
 259  *
 260  * DESCRIPTION: Disable all GPEs within a single GPE block
 261  *
 262  ******************************************************************************/
 263
 264 acpi_status
 265 acpi_hw_disable_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 266                           struct acpi_gpe_block_info *gpe_block, void *context)
 267 {
 268         u32 i;
 269         acpi_status status;
 270
 271         /* Examine each GPE Register within the block */
 272
 273         for (i = 0; i < gpe_block->register_count; i++) {
 274
 275                 /* Disable all GPEs in this register */
 276
 277                 status =
 278                     acpi_hw_write(0x00,
 279                                   &gpe_block->register_info[i].enable_address);
 280                 if (ACPI_FAILURE(status)) {
 281                         return (status);
 282                 }
 283         }
 284
 285         return (AE_OK);
 286 }
 287
 288 /******************************************************************************
 289  *
 290  * FUNCTION:    acpi_hw_clear_gpe_block
 291  *
 292  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 293  *              gpe_block           - Gpe Block info
 294  *
 295  * RETURN:      Status
 296  *
 297  * DESCRIPTION: Clear status bits for all GPEs within a single GPE block
 298  *
 299  ******************************************************************************/
 300
 301 acpi_status
 302 acpi_hw_clear_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 303                         struct acpi_gpe_block_info *gpe_block, void *context)
 304 {
 305         u32 i;
 306         acpi_status status;
 307
 308         /* Examine each GPE Register within the block */
 309
 310         for (i = 0; i < gpe_block->register_count; i++) {
 311
 312                 /* Clear status on all GPEs in this register */
 313
 314                 status =
 315                     acpi_hw_write(0xFF,
 316                                   &gpe_block->register_info[i].status_address);
 317                 if (ACPI_FAILURE(status)) {
 318                         return (status);
 319                 }
 320         }
 321
 322         return (AE_OK);
 323 }
 324
 325 /******************************************************************************
 326  *
 327  * FUNCTION:    acpi_hw_enable_runtime_gpe_block
 328  *
 329  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 330  *              gpe_block           - Gpe Block info
 331  *
 332  * RETURN:      Status
 333  *
 334  * DESCRIPTION: Enable all "runtime" GPEs within a single GPE block. Includes
 335  *              combination wake/run GPEs.
 336  *
 337  ******************************************************************************/
 338
 339 acpi_status
 340 acpi_hw_enable_runtime_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 341                                  struct acpi_gpe_block_info *gpe_block, void *context)
 342 {
 343         u32 i;
 344         acpi_status status;
 345
 346         /* NOTE: assumes that all GPEs are currently disabled */
 347
 348         /* Examine each GPE Register within the block */
 349
 350         for (i = 0; i < gpe_block->register_count; i++) {
 351                 if (!gpe_block->register_info[i].enable_for_run) {
 352                         continue;
 353                 }
 354
 355                 /* Enable all "runtime" GPEs in this register */
 356
 357                 status =
 358                     acpi_hw_write(gpe_block->register_info[i].enable_for_run,
 359                                   &gpe_block->register_info[i].enable_address);
 360                 if (ACPI_FAILURE(status)) {
 361                         return (status);
 362                 }
 363         }
 364
 365         return (AE_OK);
 366 }
 367
 368 /******************************************************************************
 369  *
 370  * FUNCTION:    acpi_hw_enable_wakeup_gpe_block
 371  *
 372  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 373  *              gpe_block           - Gpe Block info
 374  *
 375  * RETURN:      Status
 376  *
 377  * DESCRIPTION: Enable all "wake" GPEs within a single GPE block. Includes
 378  *              combination wake/run GPEs.
 379  *
 380  ******************************************************************************/
 381
 382 static acpi_status
 383 acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 384                                 struct acpi_gpe_block_info *gpe_block,
 385                                 void *context)
 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 =
 400                     acpi_hw_write(gpe_block->register_info[i].enable_for_wake,
 401                                   &gpe_block->register_info[i].enable_address);
 402                 if (ACPI_FAILURE(status)) {
 403                         return (status);
 404                 }
 405         }
 406
 407         return (AE_OK);
 408 }
 409
 410 /******************************************************************************
 411  *
 412  * FUNCTION:    acpi_hw_disable_all_gpes
 413  *
 414  * PARAMETERS:  None
 415  *
 416  * RETURN:      Status
 417  *
 418  * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 419  *
 420  ******************************************************************************/
 421
 422 acpi_status acpi_hw_disable_all_gpes(void)
 423 {
 424         acpi_status status;
 425
 426         ACPI_FUNCTION_TRACE(hw_disable_all_gpes);
 427
 428         status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block, NULL);
 429         status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block, NULL);
 430         return_ACPI_STATUS(status);
 431 }
 432
 433 /******************************************************************************
 434  *
 435  * FUNCTION:    acpi_hw_enable_all_runtime_gpes
 436  *
 437  * PARAMETERS:  None
 438  *
 439  * RETURN:      Status
 440  *
 441  * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 442  *
 443  ******************************************************************************/
 444
 445 acpi_status acpi_hw_enable_all_runtime_gpes(void)
 446 {
 447         acpi_status status;
 448
 449         ACPI_FUNCTION_TRACE(hw_enable_all_runtime_gpes);
 450
 451         status = acpi_ev_walk_gpe_list(acpi_hw_enable_runtime_gpe_block, NULL);
 452         return_ACPI_STATUS(status);
 453 }
 454
 455 /******************************************************************************
 456  *
 457  * FUNCTION:    acpi_hw_enable_all_wakeup_gpes
 458  *
 459  * PARAMETERS:  None
 460  *
 461  * RETURN:      Status
 462  *
 463  * DESCRIPTION: Enable all "wakeup" GPEs, in all GPE blocks
 464  *
 465  ******************************************************************************/
 466
 467 acpi_status acpi_hw_enable_all_wakeup_gpes(void)
 468 {
 469         acpi_status status;
 470
 471         ACPI_FUNCTION_TRACE(hw_enable_all_wakeup_gpes);
 472
 473         status = acpi_ev_walk_gpe_list(acpi_hw_enable_wakeup_gpe_block, NULL);
 474         return_ACPI_STATUS(status);
 475 }