git.oblomov.eu Git - linux-2.6/blob - 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 - 2007, 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 #include <acpi/acpi.h>
  47 #include <acpi/acnamesp.h>
  48 #include <acpi/acevents.h>
  49
  50 #define _COMPONENT          ACPI_HARDWARE
  51 ACPI_MODULE_NAME("hwregs")
  52
  53 /*******************************************************************************
  54  *
  55  * FUNCTION:    acpi_hw_clear_acpi_status
  56  *
  57  * PARAMETERS:  None
  58  *
  59  * RETURN:      None
  60  *
  61  * DESCRIPTION: Clears all fixed and general purpose status bits
  62  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
  63  *
  64  ******************************************************************************/
  65 acpi_status acpi_hw_clear_acpi_status(void)
  66 {
  67         acpi_status status;
  68         acpi_cpu_flags lock_flags = 0;
  69
  70         ACPI_FUNCTION_TRACE(hw_clear_acpi_status);
  71
  72         ACPI_DEBUG_PRINT((ACPI_DB_IO, "About to write %04X to %04X\n",
  73                           ACPI_BITMASK_ALL_FIXED_STATUS,
  74                           (u16) acpi_gbl_FADT.xpm1a_event_block.address));
  75
  76         lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
  77
  78         status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
  79                                         ACPI_REGISTER_PM1_STATUS,
  80                                         ACPI_BITMASK_ALL_FIXED_STATUS);
  81         if (ACPI_FAILURE(status)) {
  82                 goto unlock_and_exit;
  83         }
  84
  85         /* Clear the fixed events */
  86
  87         if (acpi_gbl_FADT.xpm1b_event_block.address) {
  88                 status =
  89                     acpi_hw_low_level_write(16, ACPI_BITMASK_ALL_FIXED_STATUS,
  90                                             &acpi_gbl_FADT.xpm1b_event_block);
  91                 if (ACPI_FAILURE(status)) {
  92                         goto unlock_and_exit;
  93                 }
  94         }
  95
  96         /* Clear the GPE Bits in all GPE registers in all GPE blocks */
  97
  98         status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block);
  99
 100       unlock_and_exit:
 101         acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
 102         return_ACPI_STATUS(status);
 103 }
 104
 105 /*******************************************************************************
 106  *
 107  * FUNCTION:    acpi_get_sleep_type_data
 108  *
 109  * PARAMETERS:  sleep_state         - Numeric sleep state
 110  *              *sleep_type_a        - Where SLP_TYPa is returned
 111  *              *sleep_type_b        - Where SLP_TYPb is returned
 112  *
 113  * RETURN:      Status - ACPI status
 114  *
 115  * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep
 116  *              state.
 117  *
 118  ******************************************************************************/
 119
 120 acpi_status
 121 acpi_get_sleep_type_data(u8 sleep_state, u8 * sleep_type_a, u8 * sleep_type_b)
 122 {
 123         acpi_status status = AE_OK;
 124         struct acpi_evaluate_info *info;
 125
 126         ACPI_FUNCTION_TRACE(acpi_get_sleep_type_data);
 127
 128         /* Validate parameters */
 129
 130         if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) {
 131                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 132         }
 133
 134         /* Allocate the evaluation information block */
 135
 136         info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 137         if (!info) {
 138                 return_ACPI_STATUS(AE_NO_MEMORY);
 139         }
 140
 141         info->pathname =
 142             ACPI_CAST_PTR(char, acpi_gbl_sleep_state_names[sleep_state]);
 143
 144         /* Evaluate the namespace object containing the values for this state */
 145
 146         status = acpi_ns_evaluate(info);
 147         if (ACPI_FAILURE(status)) {
 148                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 149                                   "%s while evaluating SleepState [%s]\n",
 150                                   acpi_format_exception(status),
 151                                   info->pathname));
 152
 153                 goto cleanup;
 154         }
 155
 156         /* Must have a return object */
 157
 158         if (!info->return_object) {
 159                 ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]",
 160                             info->pathname));
 161                 status = AE_NOT_EXIST;
 162         }
 163
 164         /* It must be of type Package */
 165
 166         else if (ACPI_GET_OBJECT_TYPE(info->return_object) != ACPI_TYPE_PACKAGE) {
 167                 ACPI_ERROR((AE_INFO,
 168                             "Sleep State return object is not a Package"));
 169                 status = AE_AML_OPERAND_TYPE;
 170         }
 171
 172         /*
 173          * The package must have at least two elements. NOTE (March 2005): This
 174          * goes against the current ACPI spec which defines this object as a
 175          * package with one encoded DWORD element. However, existing practice
 176          * by BIOS vendors seems to be to have 2 or more elements, at least
 177          * one per sleep type (A/B).
 178          */
 179         else if (info->return_object->package.count < 2) {
 180                 ACPI_ERROR((AE_INFO,
 181                             "Sleep State return package does not have at least two elements"));
 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(info->return_object->package.elements[0])
 188                   != ACPI_TYPE_INTEGER) ||
 189                  (ACPI_GET_OBJECT_TYPE(info->return_object->package.elements[1])
 190                   != ACPI_TYPE_INTEGER)) {
 191                 ACPI_ERROR((AE_INFO,
 192                             "Sleep State return package elements are not both Integers (%s, %s)",
 193                             acpi_ut_get_object_type_name(info->return_object->
 194                                                          package.elements[0]),
 195                             acpi_ut_get_object_type_name(info->return_object->
 196                                                          package.elements[1])));
 197                 status = AE_AML_OPERAND_TYPE;
 198         } else {
 199                 /* Valid _Sx_ package size, type, and value */
 200
 201                 *sleep_type_a = (u8)
 202                     (info->return_object->package.elements[0])->integer.value;
 203                 *sleep_type_b = (u8)
 204                     (info->return_object->package.elements[1])->integer.value;
 205         }
 206
 207         if (ACPI_FAILURE(status)) {
 208                 ACPI_EXCEPTION((AE_INFO, status,
 209                                 "While evaluating SleepState [%s], bad Sleep object %p type %s",
 210                                 info->pathname, info->return_object,
 211                                 acpi_ut_get_object_type_name(info->
 212                                                              return_object)));
 213         }
 214
 215         acpi_ut_remove_reference(info->return_object);
 216
 217       cleanup:
 218         ACPI_FREE(info);
 219         return_ACPI_STATUS(status);
 220 }
 221
 222 ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data)
 223
 224 /*******************************************************************************
 225  *
 226  * FUNCTION:    acpi_hw_get_register_bit_mask
 227  *
 228  * PARAMETERS:  register_id         - Index of ACPI Register to access
 229  *
 230  * RETURN:      The bitmask to be used when accessing the register
 231  *
 232  * DESCRIPTION: Map register_id into a register bitmask.
 233  *
 234  ******************************************************************************/
 235 struct acpi_bit_register_info *acpi_hw_get_bit_register_info(u32 register_id)
 236 {
 237         ACPI_FUNCTION_ENTRY();
 238
 239         if (register_id > ACPI_BITREG_MAX) {
 240                 ACPI_ERROR((AE_INFO, "Invalid BitRegister ID: %X",
 241                             register_id));
 242                 return (NULL);
 243         }
 244
 245         return (&acpi_gbl_bit_register_info[register_id]);
 246 }
 247
 248 /*******************************************************************************
 249  *
 250  * FUNCTION:    acpi_get_register
 251  *
 252  * PARAMETERS:  register_id     - ID of ACPI bit_register to access
 253  *              return_value    - Value that was read from the register
 254  *
 255  * RETURN:      Status and the value read from specified Register. Value
 256  *              returned is normalized to bit0 (is shifted all the way right)
 257  *
 258  * DESCRIPTION: ACPI bit_register read function.
 259  *
 260  ******************************************************************************/
 261
 262 acpi_status acpi_get_register(u32 register_id, u32 * return_value)
 263 {
 264         u32 register_value = 0;
 265         struct acpi_bit_register_info *bit_reg_info;
 266         acpi_status status;
 267
 268         ACPI_FUNCTION_TRACE(acpi_get_register);
 269
 270         /* Get the info structure corresponding to the requested ACPI Register */
 271
 272         bit_reg_info = acpi_hw_get_bit_register_info(register_id);
 273         if (!bit_reg_info) {
 274                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 275         }
 276
 277         /* Read from the register */
 278
 279         status = acpi_hw_register_read(ACPI_MTX_LOCK,
 280                                        bit_reg_info->parent_register,
 281                                        &register_value);
 282
 283         if (ACPI_SUCCESS(status)) {
 284
 285                 /* Normalize the value that was read */
 286
 287                 register_value =
 288                     ((register_value & bit_reg_info->access_bit_mask)
 289                      >> bit_reg_info->bit_position);
 290
 291                 *return_value = register_value;
 292
 293                 ACPI_DEBUG_PRINT((ACPI_DB_IO, "Read value %8.8X register %X\n",
 294                                   register_value,
 295                                   bit_reg_info->parent_register));
 296         }
 297
 298         return_ACPI_STATUS(status);
 299 }
 300
 301 ACPI_EXPORT_SYMBOL(acpi_get_register)
 302
 303 /*******************************************************************************
 304  *
 305  * FUNCTION:    acpi_set_register
 306  *
 307  * PARAMETERS:  register_id     - ID of ACPI bit_register to access
 308  *              Value           - (only used on write) value to write to the
 309  *                                Register, NOT pre-normalized to the bit pos
 310  *
 311  * RETURN:      Status
 312  *
 313  * DESCRIPTION: ACPI Bit Register write function.
 314  *
 315  ******************************************************************************/
 316 acpi_status acpi_set_register(u32 register_id, u32 value)
 317 {
 318         u32 register_value = 0;
 319         struct acpi_bit_register_info *bit_reg_info;
 320         acpi_status status;
 321         acpi_cpu_flags lock_flags;
 322
 323         ACPI_FUNCTION_TRACE_U32(acpi_set_register, register_id);
 324
 325         /* Get the info structure corresponding to the requested ACPI Register */
 326
 327         bit_reg_info = acpi_hw_get_bit_register_info(register_id);
 328         if (!bit_reg_info) {
 329                 ACPI_ERROR((AE_INFO, "Bad ACPI HW RegisterId: %X",
 330                             register_id));
 331                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 332         }
 333
 334         lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
 335
 336         /* Always do a register read first so we can insert the new bits  */
 337
 338         status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
 339                                        bit_reg_info->parent_register,
 340                                        &register_value);
 341         if (ACPI_FAILURE(status)) {
 342                 goto unlock_and_exit;
 343         }
 344
 345         /*
 346          * Decode the Register ID
 347          * Register ID = [Register block ID] | [bit ID]
 348          *
 349          * Check bit ID to fine locate Register offset.
 350          * Check Mask to determine Register offset, and then read-write.
 351          */
 352         switch (bit_reg_info->parent_register) {
 353         case ACPI_REGISTER_PM1_STATUS:
 354
 355                 /*
 356                  * Status Registers are different from the rest. Clear by
 357                  * writing 1, and writing 0 has no effect. So, the only relevant
 358                  * information is the single bit we're interested in, all others should
 359                  * be written as 0 so they will be left unchanged.
 360                  */
 361                 value = ACPI_REGISTER_PREPARE_BITS(value,
 362                                                    bit_reg_info->bit_position,
 363                                                    bit_reg_info->
 364                                                    access_bit_mask);
 365                 if (value) {
 366                         status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 367                                                         ACPI_REGISTER_PM1_STATUS,
 368                                                         (u16) value);
 369                         register_value = 0;
 370                 }
 371                 break;
 372
 373         case ACPI_REGISTER_PM1_ENABLE:
 374
 375                 ACPI_REGISTER_INSERT_VALUE(register_value,
 376                                            bit_reg_info->bit_position,
 377                                            bit_reg_info->access_bit_mask,
 378                                            value);
 379
 380                 status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 381                                                 ACPI_REGISTER_PM1_ENABLE,
 382                                                 (u16) register_value);
 383                 break;
 384
 385         case ACPI_REGISTER_PM1_CONTROL:
 386
 387                 /*
 388                  * Write the PM1 Control register.
 389                  * Note that at this level, the fact that there are actually TWO
 390                  * registers (A and B - and B may not exist) is abstracted.
 391                  */
 392                 ACPI_DEBUG_PRINT((ACPI_DB_IO, "PM1 control: Read %X\n",
 393                                   register_value));
 394
 395                 ACPI_REGISTER_INSERT_VALUE(register_value,
 396                                            bit_reg_info->bit_position,
 397                                            bit_reg_info->access_bit_mask,
 398                                            value);
 399
 400                 status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 401                                                 ACPI_REGISTER_PM1_CONTROL,
 402                                                 (u16) register_value);
 403                 break;
 404
 405         case ACPI_REGISTER_PM2_CONTROL:
 406
 407                 status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
 408                                                ACPI_REGISTER_PM2_CONTROL,
 409                                                &register_value);
 410                 if (ACPI_FAILURE(status)) {
 411                         goto unlock_and_exit;
 412                 }
 413
 414                 ACPI_DEBUG_PRINT((ACPI_DB_IO,
 415                                   "PM2 control: Read %X from %8.8X%8.8X\n",
 416                                   register_value,
 417                                   ACPI_FORMAT_UINT64(acpi_gbl_FADT.
 418                                                      xpm2_control_block.
 419                                                      address)));
 420
 421                 ACPI_REGISTER_INSERT_VALUE(register_value,
 422                                            bit_reg_info->bit_position,
 423                                            bit_reg_info->access_bit_mask,
 424                                            value);
 425
 426                 ACPI_DEBUG_PRINT((ACPI_DB_IO,
 427                                   "About to write %4.4X to %8.8X%8.8X\n",
 428                                   register_value,
 429                                   ACPI_FORMAT_UINT64(acpi_gbl_FADT.
 430                                                      xpm2_control_block.
 431                                                      address)));
 432
 433                 status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 434                                                 ACPI_REGISTER_PM2_CONTROL,
 435                                                 (u8) (register_value));
 436                 break;
 437
 438         default:
 439                 break;
 440         }
 441
 442       unlock_and_exit:
 443
 444         acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
 445
 446         /* Normalize the value that was read */
 447
 448         ACPI_DEBUG_EXEC(register_value =
 449                         ((register_value & bit_reg_info->access_bit_mask) >>
 450                          bit_reg_info->bit_position));
 451
 452         ACPI_DEBUG_PRINT((ACPI_DB_IO,
 453                           "Set bits: %8.8X actual %8.8X register %X\n", value,
 454                           register_value, bit_reg_info->parent_register));
 455         return_ACPI_STATUS(status);
 456 }
 457
 458 ACPI_EXPORT_SYMBOL(acpi_set_register)
 459
 460 /******************************************************************************
 461  *
 462  * FUNCTION:    acpi_hw_register_read
 463  *
 464  * PARAMETERS:  use_lock            - Lock hardware? True/False
 465  *              register_id         - ACPI Register ID
 466  *              return_value        - Where the register value is returned
 467  *
 468  * RETURN:      Status and the value read.
 469  *
 470  * DESCRIPTION: Read from the specified ACPI register
 471  *
 472  ******************************************************************************/
 473 acpi_status
 474 acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value)
 475 {
 476         u32 value1 = 0;
 477         u32 value2 = 0;
 478         acpi_status status;
 479         acpi_cpu_flags lock_flags = 0;
 480
 481         ACPI_FUNCTION_TRACE(hw_register_read);
 482
 483         if (ACPI_MTX_LOCK == use_lock) {
 484                 lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
 485         }
 486
 487         switch (register_id) {
 488         case ACPI_REGISTER_PM1_STATUS:  /* 16-bit access */
 489
 490                 status =
 491                     acpi_hw_low_level_read(16, &value1,
 492                                            &acpi_gbl_FADT.xpm1a_event_block);
 493                 if (ACPI_FAILURE(status)) {
 494                         goto unlock_and_exit;
 495                 }
 496
 497                 /* PM1B is optional */
 498
 499                 status =
 500                     acpi_hw_low_level_read(16, &value2,
 501                                            &acpi_gbl_FADT.xpm1b_event_block);
 502                 value1 |= value2;
 503                 break;
 504
 505         case ACPI_REGISTER_PM1_ENABLE:  /* 16-bit access */
 506
 507                 status =
 508                     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 =
 516                     acpi_hw_low_level_read(16, &value2, &acpi_gbl_xpm1b_enable);
 517                 value1 |= value2;
 518                 break;
 519
 520         case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */
 521
 522                 status =
 523                     acpi_hw_low_level_read(16, &value1,
 524                                            &acpi_gbl_FADT.xpm1a_control_block);
 525                 if (ACPI_FAILURE(status)) {
 526                         goto unlock_and_exit;
 527                 }
 528
 529                 status =
 530                     acpi_hw_low_level_read(16, &value2,
 531                                            &acpi_gbl_FADT.xpm1b_control_block);
 532                 value1 |= value2;
 533                 break;
 534
 535         case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */
 536
 537                 status =
 538                     acpi_hw_low_level_read(8, &value1,
 539                                            &acpi_gbl_FADT.xpm2_control_block);
 540                 break;
 541
 542         case ACPI_REGISTER_PM_TIMER:    /* 32-bit access */
 543
 544                 status =
 545                     acpi_hw_low_level_read(32, &value1,
 546                                            &acpi_gbl_FADT.xpm_timer_block);
 547                 break;
 548
 549         case ACPI_REGISTER_SMI_COMMAND_BLOCK:   /* 8-bit access */
 550
 551                 status =
 552                     acpi_os_read_port(acpi_gbl_FADT.smi_command, &value1, 8);
 553                 break;
 554
 555         default:
 556                 ACPI_ERROR((AE_INFO, "Unknown Register ID: %X", register_id));
 557                 status = AE_BAD_PARAMETER;
 558                 break;
 559         }
 560
 561       unlock_and_exit:
 562         if (ACPI_MTX_LOCK == use_lock) {
 563                 acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
 564         }
 565
 566         if (ACPI_SUCCESS(status)) {
 567                 *return_value = value1;
 568         }
 569
 570         return_ACPI_STATUS(status);
 571 }
 572
 573 /******************************************************************************
 574  *
 575  * FUNCTION:    acpi_hw_register_write
 576  *
 577  * PARAMETERS:  use_lock            - Lock hardware? True/False
 578  *              register_id         - ACPI Register ID
 579  *              Value               - The value to write
 580  *
 581  * RETURN:      Status
 582  *
 583  * DESCRIPTION: Write to the specified ACPI register
 584  *
 585  * NOTE: In accordance with the ACPI specification, this function automatically
 586  * preserves the value of the following bits, meaning that these bits cannot be
 587  * changed via this interface:
 588  *
 589  * PM1_CONTROL[0] = SCI_EN
 590  * PM1_CONTROL[9]
 591  * PM1_STATUS[11]
 592  *
 593  * ACPI References:
 594  * 1) Hardware Ignored Bits: When software writes to a register with ignored
 595  *      bit fields, it preserves the ignored bit fields
 596  * 2) SCI_EN: OSPM always preserves this bit position
 597  *
 598  ******************************************************************************/
 599
 600 acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value)
 601 {
 602         acpi_status status;
 603         acpi_cpu_flags lock_flags = 0;
 604         u32 read_value;
 605
 606         ACPI_FUNCTION_TRACE(hw_register_write);
 607
 608         if (ACPI_MTX_LOCK == use_lock) {
 609                 lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
 610         }
 611
 612         switch (register_id) {
 613         case ACPI_REGISTER_PM1_STATUS:  /* 16-bit access */
 614
 615                 /* Perform a read first to preserve certain bits (per ACPI spec) */
 616
 617                 status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
 618                                                ACPI_REGISTER_PM1_STATUS,
 619                                                &read_value);
 620                 if (ACPI_FAILURE(status)) {
 621                         goto unlock_and_exit;
 622                 }
 623
 624                 /* Insert the bits to be preserved */
 625
 626                 ACPI_INSERT_BITS(value, ACPI_PM1_STATUS_PRESERVED_BITS,
 627                                  read_value);
 628
 629                 /* Now we can write the data */
 630
 631                 status =
 632                     acpi_hw_low_level_write(16, value,
 633                                             &acpi_gbl_FADT.xpm1a_event_block);
 634                 if (ACPI_FAILURE(status)) {
 635                         goto unlock_and_exit;
 636                 }
 637
 638                 /* PM1B is optional */
 639
 640                 status =
 641                     acpi_hw_low_level_write(16, value,
 642                                             &acpi_gbl_FADT.xpm1b_event_block);
 643                 break;
 644
 645         case ACPI_REGISTER_PM1_ENABLE:  /* 16-bit access */
 646
 647                 status =
 648                     acpi_hw_low_level_write(16, value, &acpi_gbl_xpm1a_enable);
 649                 if (ACPI_FAILURE(status)) {
 650                         goto unlock_and_exit;
 651                 }
 652
 653                 /* PM1B is optional */
 654
 655                 status =
 656                     acpi_hw_low_level_write(16, value, &acpi_gbl_xpm1b_enable);
 657                 break;
 658
 659         case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */
 660
 661                 /*
 662                  * Perform a read first to preserve certain bits (per ACPI spec)
 663                  */
 664                 status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
 665                                                ACPI_REGISTER_PM1_CONTROL,
 666                                                &read_value);
 667                 if (ACPI_FAILURE(status)) {
 668                         goto unlock_and_exit;
 669                 }
 670
 671                 /* Insert the bits to be preserved */
 672
 673                 ACPI_INSERT_BITS(value, ACPI_PM1_CONTROL_PRESERVED_BITS,
 674                                  read_value);
 675
 676                 /* Now we can write the data */
 677
 678                 status =
 679                     acpi_hw_low_level_write(16, value,
 680                                             &acpi_gbl_FADT.xpm1a_control_block);
 681                 if (ACPI_FAILURE(status)) {
 682                         goto unlock_and_exit;
 683                 }
 684
 685                 status =
 686                     acpi_hw_low_level_write(16, value,
 687                                             &acpi_gbl_FADT.xpm1b_control_block);
 688                 break;
 689
 690         case ACPI_REGISTER_PM1A_CONTROL:        /* 16-bit access */
 691
 692                 status =
 693                     acpi_hw_low_level_write(16, value,
 694                                             &acpi_gbl_FADT.xpm1a_control_block);
 695                 break;
 696
 697         case ACPI_REGISTER_PM1B_CONTROL:        /* 16-bit access */
 698
 699                 status =
 700                     acpi_hw_low_level_write(16, value,
 701                                             &acpi_gbl_FADT.xpm1b_control_block);
 702                 break;
 703
 704         case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */
 705
 706                 status =
 707                     acpi_hw_low_level_write(8, value,
 708                                             &acpi_gbl_FADT.xpm2_control_block);
 709                 break;
 710
 711         case ACPI_REGISTER_PM_TIMER:    /* 32-bit access */
 712
 713                 status =
 714                     acpi_hw_low_level_write(32, value,
 715                                             &acpi_gbl_FADT.xpm_timer_block);
 716                 break;
 717
 718         case ACPI_REGISTER_SMI_COMMAND_BLOCK:   /* 8-bit access */
 719
 720                 /* SMI_CMD is currently always in IO space */
 721
 722                 status =
 723                     acpi_os_write_port(acpi_gbl_FADT.smi_command, value, 8);
 724                 break;
 725
 726         default:
 727                 status = AE_BAD_PARAMETER;
 728                 break;
 729         }
 730
 731       unlock_and_exit:
 732         if (ACPI_MTX_LOCK == use_lock) {
 733                 acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
 734         }
 735
 736         return_ACPI_STATUS(status);
 737 }
 738
 739 /******************************************************************************
 740  *
 741  * FUNCTION:    acpi_hw_low_level_read
 742  *
 743  * PARAMETERS:  Width               - 8, 16, or 32
 744  *              Value               - Where the value is returned
 745  *              Reg                 - GAS register structure
 746  *
 747  * RETURN:      Status
 748  *
 749  * DESCRIPTION: Read from either memory or IO space.
 750  *
 751  ******************************************************************************/
 752
 753 acpi_status
 754 acpi_hw_low_level_read(u32 width, u32 * value, struct acpi_generic_address *reg)
 755 {
 756         u64 address;
 757         acpi_status status;
 758
 759         ACPI_FUNCTION_NAME(hw_low_level_read);
 760
 761         /*
 762          * Must have a valid pointer to a GAS structure, and
 763          * a non-zero address within. However, don't return an error
 764          * because the PM1A/B code must not fail if B isn't present.
 765          */
 766         if (!reg) {
 767                 return (AE_OK);
 768         }
 769
 770         /* Get a local copy of the address. Handles possible alignment issues */
 771
 772         ACPI_MOVE_64_TO_64(&address, &reg->address);
 773         if (!address) {
 774                 return (AE_OK);
 775         }
 776         *value = 0;
 777
 778         /*
 779          * Two address spaces supported: Memory or IO.
 780          * PCI_Config is not supported here because the GAS struct is insufficient
 781          */
 782         switch (reg->space_id) {
 783         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 784
 785                 status = acpi_os_read_memory((acpi_physical_address) address,
 786                                              value, width);
 787                 break;
 788
 789         case ACPI_ADR_SPACE_SYSTEM_IO:
 790
 791                 status =
 792                     acpi_os_read_port((acpi_io_address) address, value, width);
 793                 break;
 794
 795         default:
 796                 ACPI_ERROR((AE_INFO,
 797                             "Unsupported address space: %X", reg->space_id));
 798                 return (AE_BAD_PARAMETER);
 799         }
 800
 801         ACPI_DEBUG_PRINT((ACPI_DB_IO,
 802                           "Read:  %8.8X width %2d from %8.8X%8.8X (%s)\n",
 803                           *value, width, ACPI_FORMAT_UINT64(address),
 804                           acpi_ut_get_region_name(reg->space_id)));
 805
 806         return (status);
 807 }
 808
 809 /******************************************************************************
 810  *
 811  * FUNCTION:    acpi_hw_low_level_write
 812  *
 813  * PARAMETERS:  Width               - 8, 16, or 32
 814  *              Value               - To be written
 815  *              Reg                 - GAS register structure
 816  *
 817  * RETURN:      Status
 818  *
 819  * DESCRIPTION: Write to either memory or IO space.
 820  *
 821  ******************************************************************************/
 822
 823 acpi_status
 824 acpi_hw_low_level_write(u32 width, u32 value, struct acpi_generic_address * reg)
 825 {
 826         u64 address;
 827         acpi_status status;
 828
 829         ACPI_FUNCTION_NAME(hw_low_level_write);
 830
 831         /*
 832          * Must have a valid pointer to a GAS structure, and
 833          * a non-zero address within. However, don't return an error
 834          * because the PM1A/B code must not fail if B isn't present.
 835          */
 836         if (!reg) {
 837                 return (AE_OK);
 838         }
 839
 840         /* Get a local copy of the address. Handles possible alignment issues */
 841
 842         ACPI_MOVE_64_TO_64(&address, &reg->address);
 843         if (!address) {
 844                 return (AE_OK);
 845         }
 846
 847         /*
 848          * Two address spaces supported: Memory or IO.
 849          * PCI_Config is not supported here because the GAS struct is insufficient
 850          */
 851         switch (reg->space_id) {
 852         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 853
 854                 status = acpi_os_write_memory((acpi_physical_address) address,
 855                                               value, width);
 856                 break;
 857
 858         case ACPI_ADR_SPACE_SYSTEM_IO:
 859
 860                 status = acpi_os_write_port((acpi_io_address) address, value,
 861                                             width);
 862                 break;
 863
 864         default:
 865                 ACPI_ERROR((AE_INFO,
 866                             "Unsupported address space: %X", reg->space_id));
 867                 return (AE_BAD_PARAMETER);
 868         }
 869
 870         ACPI_DEBUG_PRINT((ACPI_DB_IO,
 871                           "Wrote: %8.8X width %2d   to %8.8X%8.8X (%s)\n",
 872                           value, width, ACPI_FORMAT_UINT64(address),
 873                           acpi_ut_get_region_name(reg->space_id)));
 874
 875         return (status);
 876 }