drivers/acpi/hardware/hwregs.c

   1
   2 /*******************************************************************************
   3  *
   4  * Module Name: hwregs - Read/write access functions for the various ACPI
   5  *                       control and status registers.
   6  *
   7  ******************************************************************************/
   8
   9 /*
  10  * Copyright (C) 2000 - 2004, R. Byron Moore
  11  * All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions, and the following disclaimer,
  18  *    without modification.
  19  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  20  *    substantially similar to the "NO WARRANTY" disclaimer below
  21  *    ("Disclaimer") and any redistribution must be conditioned upon
  22  *    including a substantially similar Disclaimer requirement for further
  23  *    binary redistribution.
  24  * 3. Neither the names of the above-listed copyright holders nor the names
  25  *    of any contributors may be used to endorse or promote products derived
  26  *    from this software without specific prior written permission.
  27  *
  28  * Alternatively, this software may be distributed under the terms of the
  29  * GNU General Public License ("GPL") version 2 as published by the Free
  30  * Software Foundation.
  31  *
  32  * NO WARRANTY
  33  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  34  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  35  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  36  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  37  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  38  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  39  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  40  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  41  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  42  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  43  * POSSIBILITY OF SUCH DAMAGES.
  44  */
  45
  46
  47 #include <acpi/acpi.h>
  48 #include <acpi/acnamesp.h>
  49 #include <acpi/acevents.h>
  50
  51 #define _COMPONENT          ACPI_HARDWARE
  52          ACPI_MODULE_NAME    ("hwregs")
  53
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_hw_clear_acpi_status
  58  *
  59  * PARAMETERS:  Flags           - Lock the hardware or not
  60  *
  61  * RETURN:      none
  62  *
  63  * DESCRIPTION: Clears all fixed and general purpose status bits
  64  *
  65  ******************************************************************************/
  66
  67 acpi_status
  68 acpi_hw_clear_acpi_status (
  69         u32                             flags)
  70 {
  71         acpi_status                     status;
  72
  73
  74         ACPI_FUNCTION_TRACE ("hw_clear_acpi_status");
  75
  76
  77         ACPI_DEBUG_PRINT ((ACPI_DB_IO, "About to write %04X to %04X\n",
  78                 ACPI_BITMASK_ALL_FIXED_STATUS,
  79                 (u16) acpi_gbl_FADT->xpm1a_evt_blk.address));
  80
  81         if (flags & ACPI_MTX_LOCK) {
  82                 status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE);
  83                 if (ACPI_FAILURE (status)) {
  84                         return_ACPI_STATUS (status);
  85                 }
  86         }
  87
  88         status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1_STATUS,
  89                           ACPI_BITMASK_ALL_FIXED_STATUS);
  90         if (ACPI_FAILURE (status)) {
  91                 goto unlock_and_exit;
  92         }
  93
  94         /* Clear the fixed events */
  95
  96         if (acpi_gbl_FADT->xpm1b_evt_blk.address) {
  97                 status = acpi_hw_low_level_write (16, ACPI_BITMASK_ALL_FIXED_STATUS,
  98                                  &acpi_gbl_FADT->xpm1b_evt_blk);
  99                 if (ACPI_FAILURE (status)) {
 100                         goto unlock_and_exit;
 101                 }
 102         }
 103
 104         /* Clear the GPE Bits in all GPE registers in all GPE blocks */
 105
 106         status = acpi_ev_walk_gpe_list (acpi_hw_clear_gpe_block);
 107
 108 unlock_and_exit:
 109         if (flags & ACPI_MTX_LOCK) {
 110                 (void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE);
 111         }
 112         return_ACPI_STATUS (status);
 113 }
 114
 115
 116 /*******************************************************************************
 117  *
 118  * FUNCTION:    acpi_get_sleep_type_data
 119  *
 120  * PARAMETERS:  sleep_state         - Numeric sleep state
 121  *              *sleep_type_a        - Where SLP_TYPa is returned
 122  *              *sleep_type_b        - Where SLP_TYPb is returned
 123  *
 124  * RETURN:      Status - ACPI status
 125  *
 126  * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep
 127  *              state.
 128  *
 129  ******************************************************************************/
 130
 131 acpi_status
 132 acpi_get_sleep_type_data (
 133         u8                              sleep_state,
 134         u8                              *sleep_type_a,
 135         u8                              *sleep_type_b)
 136 {
 137         acpi_status                     status = AE_OK;
 138         union acpi_operand_object       *obj_desc;
 139
 140
 141         ACPI_FUNCTION_TRACE ("acpi_get_sleep_type_data");
 142
 143
 144         /*
 145          * Validate parameters
 146          */
 147         if ((sleep_state > ACPI_S_STATES_MAX) ||
 148                 !sleep_type_a || !sleep_type_b) {
 149                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 150         }
 151
 152         /*
 153          * Evaluate the namespace object containing the values for this state
 154          */
 155         status = acpi_ns_evaluate_by_name ((char *) acpi_gbl_sleep_state_names[sleep_state],
 156                           NULL, &obj_desc);
 157         if (ACPI_FAILURE (status)) {
 158                 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%s while evaluating sleep_state [%s]\n",
 159                         acpi_format_exception (status), acpi_gbl_sleep_state_names[sleep_state]));
 160
 161                 return_ACPI_STATUS (status);
 162         }
 163
 164         /* Must have a return object */
 165
 166         if (!obj_desc) {
 167                 ACPI_REPORT_ERROR (("Missing Sleep State object\n"));
 168                 status = AE_NOT_EXIST;
 169         }
 170
 171         /* It must be of type Package */
 172
 173         else if (ACPI_GET_OBJECT_TYPE (obj_desc) != ACPI_TYPE_PACKAGE) {
 174                 ACPI_REPORT_ERROR (("Sleep State object not a Package\n"));
 175                 status = AE_AML_OPERAND_TYPE;
 176         }
 177
 178         /* The package must have at least two elements */
 179
 180         else if (obj_desc->package.count < 2) {
 181                 ACPI_REPORT_ERROR (("Sleep State package does not have at least two elements\n"));
 182                 status = AE_AML_NO_OPERAND;
 183         }
 184
 185         /* The first two elements must both be of type Integer */
 186
 187         else if ((ACPI_GET_OBJECT_TYPE (obj_desc->package.elements[0]) != ACPI_TYPE_INTEGER) ||
 188                          (ACPI_GET_OBJECT_TYPE (obj_desc->package.elements[1]) != ACPI_TYPE_INTEGER)) {
 189                 ACPI_REPORT_ERROR (("Sleep State package elements are not both Integers (%s, %s)\n",
 190                         acpi_ut_get_object_type_name (obj_desc->package.elements[0]),
 191                         acpi_ut_get_object_type_name (obj_desc->package.elements[1])));
 192                 status = AE_AML_OPERAND_TYPE;
 193         }
 194         else {
 195                 /*
 196                  * Valid _Sx_ package size, type, and value
 197                  */
 198                 *sleep_type_a = (u8) (obj_desc->package.elements[0])->integer.value;
 199                 *sleep_type_b = (u8) (obj_desc->package.elements[1])->integer.value;
 200         }
 201
 202         if (ACPI_FAILURE (status)) {
 203                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "While evaluating sleep_state [%s], bad Sleep object %p type %s\n",
 204                         acpi_gbl_sleep_state_names[sleep_state], obj_desc, acpi_ut_get_object_type_name (obj_desc)));
 205         }
 206
 207         acpi_ut_remove_reference (obj_desc);
 208         return_ACPI_STATUS (status);
 209 }
 210
 211
 212 /*******************************************************************************
 213  *
 214  * FUNCTION:    acpi_hw_get_register_bit_mask
 215  *
 216  * PARAMETERS:  register_id         - Index of ACPI Register to access
 217  *
 218  * RETURN:      The bit mask to be used when accessing the register
 219  *
 220  * DESCRIPTION: Map register_id into a register bit mask.
 221  *
 222  ******************************************************************************/
 223
 224 struct acpi_bit_register_info *
 225 acpi_hw_get_bit_register_info (
 226         u32                             register_id)
 227 {
 228         ACPI_FUNCTION_NAME ("hw_get_bit_register_info");
 229
 230
 231         if (register_id > ACPI_BITREG_MAX) {
 232                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid bit_register ID: %X\n", register_id));
 233                 return (NULL);
 234         }
 235
 236         return (&acpi_gbl_bit_register_info[register_id]);
 237 }
 238
 239
 240 /*******************************************************************************
 241  *
 242  * FUNCTION:    acpi_get_register
 243  *
 244  * PARAMETERS:  register_id     - ID of ACPI bit_register to access
 245  *              return_value    - Value that was read from the register
 246  *              Flags           - Lock the hardware or not
 247  *
 248  * RETURN:      Value is read from specified Register.  Value returned is
 249  *              normalized to bit0 (is shifted all the way right)
 250  *
 251  * DESCRIPTION: ACPI bit_register read function.
 252  *
 253  ******************************************************************************/
 254
 255 acpi_status
 256 acpi_get_register (
 257         u32                             register_id,
 258         u32                             *return_value,
 259         u32                             flags)
 260 {
 261         u32                             register_value = 0;
 262         struct acpi_bit_register_info   *bit_reg_info;
 263         acpi_status                     status;
 264
 265
 266         ACPI_FUNCTION_TRACE ("acpi_get_register");
 267
 268
 269         /* Get the info structure corresponding to the requested ACPI Register */
 270
 271         bit_reg_info = acpi_hw_get_bit_register_info (register_id);
 272         if (!bit_reg_info) {
 273                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 274         }
 275
 276         if (flags & ACPI_MTX_LOCK) {
 277                 status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE);
 278                 if (ACPI_FAILURE (status)) {
 279                         return_ACPI_STATUS (status);
 280                 }
 281         }
 282
 283         status = acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK,
 284                           bit_reg_info->parent_register, &register_value);
 285
 286         if (flags & ACPI_MTX_LOCK) {
 287                 (void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE);
 288         }
 289
 290         if (ACPI_SUCCESS (status)) {
 291                 /* Normalize the value that was read */
 292
 293                 register_value = ((register_value & bit_reg_info->access_bit_mask)
 294                                    >> bit_reg_info->bit_position);
 295
 296                 *return_value = register_value;
 297
 298                 ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Read value %8.8X register %X\n",
 299                                 register_value, bit_reg_info->parent_register));
 300         }
 301
 302         return_ACPI_STATUS (status);
 303 }
 304
 305
 306 /*******************************************************************************
 307  *
 308  * FUNCTION:    acpi_set_register
 309  *
 310  * PARAMETERS:  register_id     - ID of ACPI bit_register to access
 311  *              Value           - (only used on write) value to write to the
 312  *                                Register, NOT pre-normalized to the bit pos.
 313  *              Flags           - Lock the hardware or not
 314  *
 315  * RETURN:      None
 316  *
 317  * DESCRIPTION: ACPI Bit Register write function.
 318  *
 319  ******************************************************************************/
 320
 321 acpi_status
 322 acpi_set_register (
 323         u32                             register_id,
 324         u32                             value,
 325         u32                             flags)
 326 {
 327         u32                             register_value = 0;
 328         struct acpi_bit_register_info   *bit_reg_info;
 329         acpi_status                     status;
 330
 331
 332         ACPI_FUNCTION_TRACE_U32 ("acpi_set_register", register_id);
 333
 334
 335         /* Get the info structure corresponding to the requested ACPI Register */
 336
 337         bit_reg_info = acpi_hw_get_bit_register_info (register_id);
 338         if (!bit_reg_info) {
 339                 ACPI_REPORT_ERROR (("Bad ACPI HW register_id: %X\n", register_id));
 340                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 341         }
 342
 343         if (flags & ACPI_MTX_LOCK) {
 344                 status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE);
 345                 if (ACPI_FAILURE (status)) {
 346                         return_ACPI_STATUS (status);
 347                 }
 348         }
 349
 350         /* Always do a register read first so we can insert the new bits  */
 351
 352         status = acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK,
 353                           bit_reg_info->parent_register, &register_value);
 354         if (ACPI_FAILURE (status)) {
 355                 goto unlock_and_exit;
 356         }
 357
 358         /*
 359          * Decode the Register ID
 360          * Register ID = [Register block ID] | [bit ID]
 361          *
 362          * Check bit ID to fine locate Register offset.
 363          * Check Mask to determine Register offset, and then read-write.
 364          */
 365         switch (bit_reg_info->parent_register) {
 366         case ACPI_REGISTER_PM1_STATUS:
 367
 368                 /*
 369                  * Status Registers are different from the rest.  Clear by
 370                  * writing 1, and writing 0 has no effect.  So, the only relevant
 371                  * information is the single bit we're interested in, all others should
 372                  * be written as 0 so they will be left unchanged.
 373                  */
 374                 value = ACPI_REGISTER_PREPARE_BITS (value,
 375                                  bit_reg_info->bit_position, bit_reg_info->access_bit_mask);
 376                 if (value) {
 377                         status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK,
 378                                          ACPI_REGISTER_PM1_STATUS, (u16) value);
 379                         register_value = 0;
 380                 }
 381                 break;
 382
 383
 384         case ACPI_REGISTER_PM1_ENABLE:
 385
 386                 ACPI_REGISTER_INSERT_VALUE (register_value, bit_reg_info->bit_position,
 387                                 bit_reg_info->access_bit_mask, value);
 388
 389                 status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK,
 390                                   ACPI_REGISTER_PM1_ENABLE, (u16) register_value);
 391                 break;
 392
 393
 394         case ACPI_REGISTER_PM1_CONTROL:
 395
 396                 /*
 397                  * Write the PM1 Control register.
 398                  * Note that at this level, the fact that there are actually TWO
 399                  * registers (A and B - and B may not exist) is abstracted.
 400                  */
 401                 ACPI_DEBUG_PRINT ((ACPI_DB_IO, "PM1 control: Read %X\n", register_value));
 402
 403                 ACPI_REGISTER_INSERT_VALUE (register_value, bit_reg_info->bit_position,
 404                                 bit_reg_info->access_bit_mask, value);
 405
 406                 status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK,
 407                                   ACPI_REGISTER_PM1_CONTROL, (u16) register_value);
 408                 break;
 409
 410
 411         case ACPI_REGISTER_PM2_CONTROL:
 412
 413                 status = acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK,
 414                                  ACPI_REGISTER_PM2_CONTROL, &register_value);
 415                 if (ACPI_FAILURE (status)) {
 416                         goto unlock_and_exit;
 417                 }
 418
 419                 ACPI_DEBUG_PRINT ((ACPI_DB_IO, "PM2 control: Read %X from %8.8X%8.8X\n",
 420                         register_value,
 421                         ACPI_FORMAT_UINT64 (acpi_gbl_FADT->xpm2_cnt_blk.address)));
 422
 423                 ACPI_REGISTER_INSERT_VALUE (register_value, bit_reg_info->bit_position,
 424                                 bit_reg_info->access_bit_mask, value);
 425
 426                 ACPI_DEBUG_PRINT ((ACPI_DB_IO, "About to write %4.4X to %8.8X%8.8X\n",
 427                         register_value,
 428                         ACPI_FORMAT_UINT64 (acpi_gbl_FADT->xpm2_cnt_blk.address)));
 429
 430                 status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK,
 431                                    ACPI_REGISTER_PM2_CONTROL, (u8) (register_value));
 432                 break;
 433
 434
 435         default:
 436                 break;
 437         }
 438
 439
 440 unlock_and_exit:
 441
 442         if (flags & ACPI_MTX_LOCK) {
 443                 (void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE);
 444         }
 445
 446         /* Normalize the value that was read */
 447
 448         ACPI_DEBUG_EXEC (register_value = ((register_value & bit_reg_info->access_bit_mask) >> bit_reg_info->bit_position));
 449
 450         ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Set bits: %8.8X actual %8.8X register %X\n",
 451                         value, register_value, bit_reg_info->parent_register));
 452         return_ACPI_STATUS (status);
 453 }
 454
 455
 456 /******************************************************************************
 457  *
 458  * FUNCTION:    acpi_hw_register_read
 459  *
 460  * PARAMETERS:  use_lock               - Mutex hw access.
 461  *              register_id            - register_iD + Offset.
 462  *
 463  * RETURN:      Value read or written.
 464  *
 465  * DESCRIPTION: Acpi register read function.  Registers are read at the
 466  *              given offset.
 467  *
 468  ******************************************************************************/
 469
 470 acpi_status
 471 acpi_hw_register_read (
 472         u8                              use_lock,
 473         u32                             register_id,
 474         u32                             *return_value)
 475 {
 476         u32                             value1 = 0;
 477         u32                             value2 = 0;
 478         acpi_status                     status;
 479
 480
 481         ACPI_FUNCTION_TRACE ("hw_register_read");
 482
 483
 484         if (ACPI_MTX_LOCK == use_lock) {
 485                 status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE);
 486                 if (ACPI_FAILURE (status)) {
 487                         return_ACPI_STATUS (status);
 488                 }
 489         }
 490
 491         switch (register_id) {
 492         case ACPI_REGISTER_PM1_STATUS:           /* 16-bit access */
 493
 494                 status = acpi_hw_low_level_read (16, &value1, &acpi_gbl_FADT->xpm1a_evt_blk);
 495                 if (ACPI_FAILURE (status)) {
 496                         goto unlock_and_exit;
 497                 }
 498
 499                 /* PM1B is optional */
 500
 501                 status = acpi_hw_low_level_read (16, &value2, &acpi_gbl_FADT->xpm1b_evt_blk);
 502                 value1 |= value2;
 503                 break;
 504
 505
 506         case ACPI_REGISTER_PM1_ENABLE:           /* 16-bit access */
 507
 508                 status = acpi_hw_low_level_read (16, &value1, &acpi_gbl_xpm1a_enable);
 509                 if (ACPI_FAILURE (status)) {
 510                         goto unlock_and_exit;
 511                 }
 512
 513                 /* PM1B is optional */
 514
 515                 status = acpi_hw_low_level_read (16, &value2, &acpi_gbl_xpm1b_enable);
 516                 value1 |= value2;
 517                 break;
 518
 519
 520         case ACPI_REGISTER_PM1_CONTROL:          /* 16-bit access */
 521
 522                 status = acpi_hw_low_level_read (16, &value1, &acpi_gbl_FADT->xpm1a_cnt_blk);
 523                 if (ACPI_FAILURE (status)) {
 524                         goto unlock_and_exit;
 525                 }
 526
 527                 status = acpi_hw_low_level_read (16, &value2, &acpi_gbl_FADT->xpm1b_cnt_blk);
 528                 value1 |= value2;
 529                 break;
 530
 531
 532         case ACPI_REGISTER_PM2_CONTROL:          /* 8-bit access */
 533
 534                 status = acpi_hw_low_level_read (8, &value1, &acpi_gbl_FADT->xpm2_cnt_blk);
 535                 break;
 536
 537
 538         case ACPI_REGISTER_PM_TIMER:             /* 32-bit access */
 539
 540                 status = acpi_hw_low_level_read (32, &value1, &acpi_gbl_FADT->xpm_tmr_blk);
 541                 break;
 542
 543         case ACPI_REGISTER_SMI_COMMAND_BLOCK:    /* 8-bit access */
 544
 545                 status = acpi_os_read_port (acpi_gbl_FADT->smi_cmd, &value1, 8);
 546                 break;
 547
 548         default:
 549                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown Register ID: %X\n", register_id));
 550                 status = AE_BAD_PARAMETER;
 551                 break;
 552         }
 553
 554 unlock_and_exit:
 555         if (ACPI_MTX_LOCK == use_lock) {
 556                 (void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE);
 557         }
 558
 559         if (ACPI_SUCCESS (status)) {
 560                 *return_value = value1;
 561         }
 562
 563         return_ACPI_STATUS (status);
 564 }
 565
 566
 567 /******************************************************************************
 568  *
 569  * FUNCTION:    acpi_hw_register_write
 570  *
 571  * PARAMETERS:  use_lock               - Mutex hw access.
 572  *              register_id            - register_iD + Offset.
 573  *
 574  * RETURN:      Value read or written.
 575  *
 576  * DESCRIPTION: Acpi register Write function.  Registers are written at the
 577  *              given offset.
 578  *
 579  ******************************************************************************/
 580
 581 acpi_status
 582 acpi_hw_register_write (
 583         u8                              use_lock,
 584         u32                             register_id,
 585         u32                             value)
 586 {
 587         acpi_status                     status;
 588
 589
 590         ACPI_FUNCTION_TRACE ("hw_register_write");
 591
 592
 593         if (ACPI_MTX_LOCK == use_lock) {
 594                 status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE);
 595                 if (ACPI_FAILURE (status)) {
 596                         return_ACPI_STATUS (status);
 597                 }
 598         }
 599
 600         switch (register_id) {
 601         case ACPI_REGISTER_PM1_STATUS:           /* 16-bit access */
 602
 603                 status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1a_evt_blk);
 604                 if (ACPI_FAILURE (status)) {
 605                         goto unlock_and_exit;
 606                 }
 607
 608                 /* PM1B is optional */
 609
 610                 status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1b_evt_blk);
 611                 break;
 612
 613
 614         case ACPI_REGISTER_PM1_ENABLE:           /* 16-bit access*/
 615
 616                 status = acpi_hw_low_level_write (16, value, &acpi_gbl_xpm1a_enable);
 617                 if (ACPI_FAILURE (status)) {
 618                         goto unlock_and_exit;
 619                 }
 620
 621                 /* PM1B is optional */
 622
 623                 status = acpi_hw_low_level_write (16, value, &acpi_gbl_xpm1b_enable);
 624                 break;
 625
 626
 627         case ACPI_REGISTER_PM1_CONTROL:          /* 16-bit access */
 628
 629                 status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1a_cnt_blk);
 630                 if (ACPI_FAILURE (status)) {
 631                         goto unlock_and_exit;
 632                 }
 633
 634                 status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1b_cnt_blk);
 635                 break;
 636
 637
 638         case ACPI_REGISTER_PM1A_CONTROL:         /* 16-bit access */
 639
 640                 status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1a_cnt_blk);
 641                 break;
 642
 643
 644         case ACPI_REGISTER_PM1B_CONTROL:         /* 16-bit access */
 645
 646                 status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1b_cnt_blk);
 647                 break;
 648
 649
 650         case ACPI_REGISTER_PM2_CONTROL:          /* 8-bit access */
 651
 652                 status = acpi_hw_low_level_write (8, value, &acpi_gbl_FADT->xpm2_cnt_blk);
 653                 break;
 654
 655
 656         case ACPI_REGISTER_PM_TIMER:             /* 32-bit access */
 657
 658                 status = acpi_hw_low_level_write (32, value, &acpi_gbl_FADT->xpm_tmr_blk);
 659                 break;
 660
 661
 662         case ACPI_REGISTER_SMI_COMMAND_BLOCK:    /* 8-bit access */
 663
 664                 /* SMI_CMD is currently always in IO space */
 665
 666                 status = acpi_os_write_port (acpi_gbl_FADT->smi_cmd, value, 8);
 667                 break;
 668
 669
 670         default:
 671                 status = AE_BAD_PARAMETER;
 672                 break;
 673         }
 674
 675 unlock_and_exit:
 676         if (ACPI_MTX_LOCK == use_lock) {
 677                 (void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE);
 678         }
 679
 680         return_ACPI_STATUS (status);
 681 }
 682
 683
 684 /******************************************************************************
 685  *
 686  * FUNCTION:    acpi_hw_low_level_read
 687  *
 688  * PARAMETERS:  Width               - 8, 16, or 32
 689  *              Value               - Where the value is returned
 690  *              Register            - GAS register structure
 691  *
 692  * RETURN:      Status
 693  *
 694  * DESCRIPTION: Read from either memory, IO, or PCI config space.
 695  *
 696  ******************************************************************************/
 697
 698 acpi_status
 699 acpi_hw_low_level_read (
 700         u32                             width,
 701         u32                             *value,
 702         struct acpi_generic_address     *reg)
 703 {
 704         struct acpi_pci_id              pci_id;
 705         u16                             pci_register;
 706         acpi_status                     status;
 707
 708
 709         ACPI_FUNCTION_NAME ("hw_low_level_read");
 710
 711
 712         /*
 713          * Must have a valid pointer to a GAS structure, and
 714          * a non-zero address within. However, don't return an error
 715          * because the PM1A/B code must not fail if B isn't present.
 716          */
 717         if ((!reg) ||
 718                 (!reg->address)) {
 719                 return (AE_OK);
 720         }
 721         *value = 0;
 722
 723         /*
 724          * Three address spaces supported:
 725          * Memory, IO, or PCI_Config.
 726          */
 727         switch (reg->address_space_id) {
 728         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 729
 730                 status = acpi_os_read_memory (
 731                                  (acpi_physical_address) reg->address,
 732                                  value, width);
 733                 break;
 734
 735
 736         case ACPI_ADR_SPACE_SYSTEM_IO:
 737
 738                 status = acpi_os_read_port ((acpi_io_address) reg->address,
 739                                  value, width);
 740                 break;
 741
 742
 743         case ACPI_ADR_SPACE_PCI_CONFIG:
 744
 745                 pci_id.segment = 0;
 746                 pci_id.bus     = 0;
 747                 pci_id.device  = ACPI_PCI_DEVICE (reg->address);
 748                 pci_id.function = ACPI_PCI_FUNCTION (reg->address);
 749                 pci_register   = (u16) ACPI_PCI_REGISTER (reg->address);
 750
 751                 status = acpi_os_read_pci_configuration (&pci_id, pci_register,
 752                                  value, width);
 753                 break;
 754
 755
 756         default:
 757                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 758                         "Unsupported address space: %X\n", reg->address_space_id));
 759                 return (AE_BAD_PARAMETER);
 760         }
 761
 762         ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Read:  %8.8X width %2d from %8.8X%8.8X (%s)\n",
 763                         *value, width,
 764                         ACPI_FORMAT_UINT64 (reg->address),
 765                         acpi_ut_get_region_name (reg->address_space_id)));
 766
 767         return (status);
 768 }
 769
 770
 771 /******************************************************************************
 772  *
 773  * FUNCTION:    acpi_hw_low_level_write
 774  *
 775  * PARAMETERS:  Width               - 8, 16, or 32
 776  *              Value               - To be written
 777  *              Register            - GAS register structure
 778  *
 779  * RETURN:      Status
 780  *
 781  * DESCRIPTION: Write to either memory, IO, or PCI config space.
 782  *
 783  ******************************************************************************/
 784
 785 acpi_status
 786 acpi_hw_low_level_write (
 787         u32                             width,
 788         u32                             value,
 789         struct acpi_generic_address     *reg)
 790 {
 791         struct acpi_pci_id              pci_id;
 792         u16                             pci_register;
 793         acpi_status                     status;
 794
 795
 796         ACPI_FUNCTION_NAME ("hw_low_level_write");
 797
 798
 799         /*
 800          * Must have a valid pointer to a GAS structure, and
 801          * a non-zero address within. However, don't return an error
 802          * because the PM1A/B code must not fail if B isn't present.
 803          */
 804         if ((!reg) ||
 805                 (!reg->address)) {
 806                 return (AE_OK);
 807         }
 808
 809         /*
 810          * Three address spaces supported:
 811          * Memory, IO, or PCI_Config.
 812          */
 813         switch (reg->address_space_id) {
 814         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 815
 816                 status = acpi_os_write_memory (
 817                                  (acpi_physical_address) reg->address,
 818                                  value, width);
 819                 break;
 820
 821
 822         case ACPI_ADR_SPACE_SYSTEM_IO:
 823
 824                 status = acpi_os_write_port ((acpi_io_address) reg->address,
 825                                  value, width);
 826                 break;
 827
 828
 829         case ACPI_ADR_SPACE_PCI_CONFIG:
 830
 831                 pci_id.segment = 0;
 832                 pci_id.bus     = 0;
 833                 pci_id.device  = ACPI_PCI_DEVICE (reg->address);
 834                 pci_id.function = ACPI_PCI_FUNCTION (reg->address);
 835                 pci_register   = (u16) ACPI_PCI_REGISTER (reg->address);
 836
 837                 status = acpi_os_write_pci_configuration (&pci_id, pci_register,
 838                                  (acpi_integer) value, width);
 839                 break;
 840
 841
 842         default:
 843                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 844                         "Unsupported address space: %X\n", reg->address_space_id));
 845                 return (AE_BAD_PARAMETER);
 846         }
 847
 848         ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Wrote: %8.8X width %2d   to %8.8X%8.8X (%s)\n",
 849                         value, width,
 850                         ACPI_FORMAT_UINT64 (reg->address),
 851                         acpi_ut_get_region_name (reg->address_space_id)));
 852
 853         return (status);
 854 }