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 - 2006, 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 <linux/module.h>
  47
  48 #include <acpi/acpi.h>
  49 #include <acpi/acnamesp.h>
  50 #include <acpi/acevents.h>
  51
  52 #define _COMPONENT          ACPI_HARDWARE
  53 ACPI_MODULE_NAME("hwregs")
  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  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
  65  *
  66  ******************************************************************************/
  67 acpi_status acpi_hw_clear_acpi_status(u32 flags)
  68 {
  69         acpi_status status;
  70
  71         ACPI_FUNCTION_TRACE("hw_clear_acpi_status");
  72
  73         ACPI_DEBUG_PRINT((ACPI_DB_IO, "About to write %04X to %04X\n",
  74                           ACPI_BITMASK_ALL_FIXED_STATUS,
  75                           (u16) acpi_gbl_FADT->xpm1a_evt_blk.address));
  76
  77         if (flags & ACPI_MTX_LOCK) {
  78                 status = acpi_ut_acquire_mutex(ACPI_MTX_HARDWARE);
  79                 if (ACPI_FAILURE(status)) {
  80                         return_ACPI_STATUS(status);
  81                 }
  82         }
  83
  84         status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
  85                                         ACPI_REGISTER_PM1_STATUS,
  86                                         ACPI_BITMASK_ALL_FIXED_STATUS);
  87         if (ACPI_FAILURE(status)) {
  88                 goto unlock_and_exit;
  89         }
  90
  91         /* Clear the fixed events */
  92
  93         if (acpi_gbl_FADT->xpm1b_evt_blk.address) {
  94                 status =
  95                     acpi_hw_low_level_write(16, ACPI_BITMASK_ALL_FIXED_STATUS,
  96                                             &acpi_gbl_FADT->xpm1b_evt_blk);
  97                 if (ACPI_FAILURE(status)) {
  98                         goto unlock_and_exit;
  99                 }
 100         }
 101
 102         /* Clear the GPE Bits in all GPE registers in all GPE blocks */
 103
 104         status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block);
 105
 106       unlock_and_exit:
 107         if (flags & ACPI_MTX_LOCK) {
 108                 (void)acpi_ut_release_mutex(ACPI_MTX_HARDWARE);
 109         }
 110         return_ACPI_STATUS(status);
 111 }
 112
 113 /*******************************************************************************
 114  *
 115  * FUNCTION:    acpi_get_sleep_type_data
 116  *
 117  * PARAMETERS:  sleep_state         - Numeric sleep state
 118  *              *sleep_type_a        - Where SLP_TYPa is returned
 119  *              *sleep_type_b        - Where SLP_TYPb is returned
 120  *
 121  * RETURN:      Status - ACPI status
 122  *
 123  * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep
 124  *              state.
 125  *
 126  ******************************************************************************/
 127
 128 acpi_status
 129 acpi_get_sleep_type_data(u8 sleep_state, u8 * sleep_type_a, u8 * sleep_type_b)
 130 {
 131         acpi_status status = AE_OK;
 132         struct acpi_parameter_info info;
 133         char *sleep_state_name;
 134
 135         ACPI_FUNCTION_TRACE("acpi_get_sleep_type_data");
 136
 137         /* Validate parameters */
 138
 139         if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) {
 140                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 141         }
 142
 143         /* Evaluate the namespace object containing the values for this state */
 144
 145         info.parameters = NULL;
 146         info.return_object = NULL;
 147         sleep_state_name =
 148             ACPI_CAST_PTR(char, acpi_gbl_sleep_state_names[sleep_state]);
 149
 150         status = acpi_ns_evaluate_by_name(sleep_state_name, &info);
 151         if (ACPI_FAILURE(status)) {
 152                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 153                                   "%s while evaluating sleep_state [%s]\n",
 154                                   acpi_format_exception(status),
 155                                   sleep_state_name));
 156
 157                 return_ACPI_STATUS(status);
 158         }
 159
 160         /* Must have a return object */
 161
 162         if (!info.return_object) {
 163                 ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]",
 164                             sleep_state_name));
 165                 status = AE_NOT_EXIST;
 166         }
 167
 168         /* It must be of type Package */
 169
 170         else if (ACPI_GET_OBJECT_TYPE(info.return_object) != ACPI_TYPE_PACKAGE) {
 171                 ACPI_ERROR((AE_INFO,
 172                             "Sleep State return object is not a Package"));
 173                 status = AE_AML_OPERAND_TYPE;
 174         }
 175
 176         /*
 177          * The package must have at least two elements.  NOTE (March 2005): This
 178          * goes against the current ACPI spec which defines this object as a
 179          * package with one encoded DWORD element.  However, existing practice
 180          * by BIOS vendors seems to be to have 2 or more elements, at least
 181          * one per sleep type (A/B).
 182          */
 183         else if (info.return_object->package.count < 2) {
 184                 ACPI_ERROR((AE_INFO,
 185                             "Sleep State return package does not have at least two elements"));
 186                 status = AE_AML_NO_OPERAND;
 187         }
 188
 189         /* The first two elements must both be of type Integer */
 190
 191         else if ((ACPI_GET_OBJECT_TYPE(info.return_object->package.elements[0])
 192                   != ACPI_TYPE_INTEGER) ||
 193                  (ACPI_GET_OBJECT_TYPE(info.return_object->package.elements[1])
 194                   != ACPI_TYPE_INTEGER)) {
 195                 ACPI_ERROR((AE_INFO,
 196                             "Sleep State return package elements are not both Integers (%s, %s)",
 197                             acpi_ut_get_object_type_name(info.return_object->
 198                                                          package.elements[0]),
 199                             acpi_ut_get_object_type_name(info.return_object->
 200                                                          package.elements[1])));
 201                 status = AE_AML_OPERAND_TYPE;
 202         } else {
 203                 /* Valid _Sx_ package size, type, and value */
 204
 205                 *sleep_type_a = (u8)
 206                     (info.return_object->package.elements[0])->integer.value;
 207                 *sleep_type_b = (u8)
 208                     (info.return_object->package.elements[1])->integer.value;
 209         }
 210
 211         if (ACPI_FAILURE(status)) {
 212                 ACPI_EXCEPTION((AE_INFO, status,
 213                                 "While evaluating sleep_state [%s], bad Sleep object %p type %s",
 214                                 sleep_state_name, info.return_object,
 215                                 acpi_ut_get_object_type_name(info.
 216                                                              return_object)));
 217         }
 218
 219         acpi_ut_remove_reference(info.return_object);
 220         return_ACPI_STATUS(status);
 221 }
 222
 223 EXPORT_SYMBOL(acpi_get_sleep_type_data);
 224
 225 /*******************************************************************************
 226  *
 227  * FUNCTION:    acpi_hw_get_register_bit_mask
 228  *
 229  * PARAMETERS:  register_id         - Index of ACPI Register to access
 230  *
 231  * RETURN:      The bitmask to be used when accessing the register
 232  *
 233  * DESCRIPTION: Map register_id into a register bitmask.
 234  *
 235  ******************************************************************************/
 236
 237 struct acpi_bit_register_info *acpi_hw_get_bit_register_info(u32 register_id)
 238 {
 239         ACPI_FUNCTION_ENTRY();
 240
 241         if (register_id > ACPI_BITREG_MAX) {
 242                 ACPI_ERROR((AE_INFO, "Invalid bit_register ID: %X",
 243                             register_id));
 244                 return (NULL);
 245         }
 246
 247         return (&acpi_gbl_bit_register_info[register_id]);
 248 }
 249
 250 /*******************************************************************************
 251  *
 252  * FUNCTION:    acpi_get_register
 253  *
 254  * PARAMETERS:  register_id     - ID of ACPI bit_register to access
 255  *              return_value    - Value that was read from the register
 256  *              Flags           - Lock the hardware or not
 257  *
 258  * RETURN:      Status and the value read from specified Register.  Value
 259  *              returned is normalized to bit0 (is shifted all the way right)
 260  *
 261  * DESCRIPTION: ACPI bit_register read function.
 262  *
 263  ******************************************************************************/
 264
 265 acpi_status acpi_get_register(u32 register_id, u32 * return_value, u32 flags)
 266 {
 267         u32 register_value = 0;
 268         struct acpi_bit_register_info *bit_reg_info;
 269         acpi_status status;
 270
 271         ACPI_FUNCTION_TRACE("acpi_get_register");
 272
 273         /* Get the info structure corresponding to the requested ACPI Register */
 274
 275         bit_reg_info = acpi_hw_get_bit_register_info(register_id);
 276         if (!bit_reg_info) {
 277                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 278         }
 279
 280         if (flags & ACPI_MTX_LOCK) {
 281                 status = acpi_ut_acquire_mutex(ACPI_MTX_HARDWARE);
 282                 if (ACPI_FAILURE(status)) {
 283                         return_ACPI_STATUS(status);
 284                 }
 285         }
 286
 287         /* Read from the register */
 288
 289         status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
 290                                        bit_reg_info->parent_register,
 291                                        &register_value);
 292
 293         if (flags & ACPI_MTX_LOCK) {
 294                 (void)acpi_ut_release_mutex(ACPI_MTX_HARDWARE);
 295         }
 296
 297         if (ACPI_SUCCESS(status)) {
 298                 /* Normalize the value that was read */
 299
 300                 register_value =
 301                     ((register_value & bit_reg_info->access_bit_mask)
 302                      >> bit_reg_info->bit_position);
 303
 304                 *return_value = register_value;
 305
 306                 ACPI_DEBUG_PRINT((ACPI_DB_IO, "Read value %8.8X register %X\n",
 307                                   register_value,
 308                                   bit_reg_info->parent_register));
 309         }
 310
 311         return_ACPI_STATUS(status);
 312 }
 313
 314 EXPORT_SYMBOL(acpi_get_register);
 315
 316 /*******************************************************************************
 317  *
 318  * FUNCTION:    acpi_set_register
 319  *
 320  * PARAMETERS:  register_id     - ID of ACPI bit_register to access
 321  *              Value           - (only used on write) value to write to the
 322  *                                Register, NOT pre-normalized to the bit pos
 323  *              Flags           - Lock the hardware or not
 324  *
 325  * RETURN:      Status
 326  *
 327  * DESCRIPTION: ACPI Bit Register write function.
 328  *
 329  ******************************************************************************/
 330
 331 acpi_status acpi_set_register(u32 register_id, u32 value, u32 flags)
 332 {
 333         u32 register_value = 0;
 334         struct acpi_bit_register_info *bit_reg_info;
 335         acpi_status status;
 336
 337         ACPI_FUNCTION_TRACE_U32("acpi_set_register", register_id);
 338
 339         /* Get the info structure corresponding to the requested ACPI Register */
 340
 341         bit_reg_info = acpi_hw_get_bit_register_info(register_id);
 342         if (!bit_reg_info) {
 343                 ACPI_ERROR((AE_INFO, "Bad ACPI HW register_id: %X",
 344                             register_id));
 345                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 346         }
 347
 348         if (flags & ACPI_MTX_LOCK) {
 349                 status = acpi_ut_acquire_mutex(ACPI_MTX_HARDWARE);
 350                 if (ACPI_FAILURE(status)) {
 351                         return_ACPI_STATUS(status);
 352                 }
 353         }
 354
 355         /* Always do a register read first so we can insert the new bits  */
 356
 357         status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
 358                                        bit_reg_info->parent_register,
 359                                        &register_value);
 360         if (ACPI_FAILURE(status)) {
 361                 goto unlock_and_exit;
 362         }
 363
 364         /*
 365          * Decode the Register ID
 366          * Register ID = [Register block ID] | [bit ID]
 367          *
 368          * Check bit ID to fine locate Register offset.
 369          * Check Mask to determine Register offset, and then read-write.
 370          */
 371         switch (bit_reg_info->parent_register) {
 372         case ACPI_REGISTER_PM1_STATUS:
 373
 374                 /*
 375                  * Status Registers are different from the rest.  Clear by
 376                  * writing 1, and writing 0 has no effect.  So, the only relevant
 377                  * information is the single bit we're interested in, all others should
 378                  * be written as 0 so they will be left unchanged.
 379                  */
 380                 value = ACPI_REGISTER_PREPARE_BITS(value,
 381                                                    bit_reg_info->bit_position,
 382                                                    bit_reg_info->
 383                                                    access_bit_mask);
 384                 if (value) {
 385                         status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 386                                                         ACPI_REGISTER_PM1_STATUS,
 387                                                         (u16) value);
 388                         register_value = 0;
 389                 }
 390                 break;
 391
 392         case ACPI_REGISTER_PM1_ENABLE:
 393
 394                 ACPI_REGISTER_INSERT_VALUE(register_value,
 395                                            bit_reg_info->bit_position,
 396                                            bit_reg_info->access_bit_mask,
 397                                            value);
 398
 399                 status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 400                                                 ACPI_REGISTER_PM1_ENABLE,
 401                                                 (u16) register_value);
 402                 break;
 403
 404         case ACPI_REGISTER_PM1_CONTROL:
 405
 406                 /*
 407                  * Write the PM1 Control register.
 408                  * Note that at this level, the fact that there are actually TWO
 409                  * registers (A and B - and B may not exist) is abstracted.
 410                  */
 411                 ACPI_DEBUG_PRINT((ACPI_DB_IO, "PM1 control: Read %X\n",
 412                                   register_value));
 413
 414                 ACPI_REGISTER_INSERT_VALUE(register_value,
 415                                            bit_reg_info->bit_position,
 416                                            bit_reg_info->access_bit_mask,
 417                                            value);
 418
 419                 status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 420                                                 ACPI_REGISTER_PM1_CONTROL,
 421                                                 (u16) register_value);
 422                 break;
 423
 424         case ACPI_REGISTER_PM2_CONTROL:
 425
 426                 status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
 427                                                ACPI_REGISTER_PM2_CONTROL,
 428                                                &register_value);
 429                 if (ACPI_FAILURE(status)) {
 430                         goto unlock_and_exit;
 431                 }
 432
 433                 ACPI_DEBUG_PRINT((ACPI_DB_IO,
 434                                   "PM2 control: Read %X from %8.8X%8.8X\n",
 435                                   register_value,
 436                                   ACPI_FORMAT_UINT64(acpi_gbl_FADT->
 437                                                      xpm2_cnt_blk.address)));
 438
 439                 ACPI_REGISTER_INSERT_VALUE(register_value,
 440                                            bit_reg_info->bit_position,
 441                                            bit_reg_info->access_bit_mask,
 442                                            value);
 443
 444                 ACPI_DEBUG_PRINT((ACPI_DB_IO,
 445                                   "About to write %4.4X to %8.8X%8.8X\n",
 446                                   register_value,
 447                                   ACPI_FORMAT_UINT64(acpi_gbl_FADT->
 448                                                      xpm2_cnt_blk.address)));
 449
 450                 status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
 451                                                 ACPI_REGISTER_PM2_CONTROL,
 452                                                 (u8) (register_value));
 453                 break;
 454
 455         default:
 456                 break;
 457         }
 458
 459       unlock_and_exit:
 460
 461         if (flags & ACPI_MTX_LOCK) {
 462                 (void)acpi_ut_release_mutex(ACPI_MTX_HARDWARE);
 463         }
 464
 465         /* Normalize the value that was read */
 466
 467         ACPI_DEBUG_EXEC(register_value =
 468                         ((register_value & bit_reg_info->access_bit_mask) >>
 469                          bit_reg_info->bit_position));
 470
 471         ACPI_DEBUG_PRINT((ACPI_DB_IO,
 472                           "Set bits: %8.8X actual %8.8X register %X\n", value,
 473                           register_value, bit_reg_info->parent_register));
 474         return_ACPI_STATUS(status);
 475 }
 476
 477 EXPORT_SYMBOL(acpi_set_register);
 478
 479 /******************************************************************************
 480  *
 481  * FUNCTION:    acpi_hw_register_read
 482  *
 483  * PARAMETERS:  use_lock            - Mutex hw access
 484  *              register_id         - register_iD + Offset
 485  *              return_value        - Where the register value is returned
 486  *
 487  * RETURN:      Status and the value read.
 488  *
 489  * DESCRIPTION: Acpi register read function.  Registers are read at the
 490  *              given offset.
 491  *
 492  ******************************************************************************/
 493
 494 acpi_status
 495 acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value)
 496 {
 497         u32 value1 = 0;
 498         u32 value2 = 0;
 499         acpi_status status;
 500
 501         ACPI_FUNCTION_TRACE("hw_register_read");
 502
 503         if (ACPI_MTX_LOCK == use_lock) {
 504                 status = acpi_ut_acquire_mutex(ACPI_MTX_HARDWARE);
 505                 if (ACPI_FAILURE(status)) {
 506                         return_ACPI_STATUS(status);
 507                 }
 508         }
 509
 510         switch (register_id) {
 511         case ACPI_REGISTER_PM1_STATUS:  /* 16-bit access */
 512
 513                 status =
 514                     acpi_hw_low_level_read(16, &value1,
 515                                            &acpi_gbl_FADT->xpm1a_evt_blk);
 516                 if (ACPI_FAILURE(status)) {
 517                         goto unlock_and_exit;
 518                 }
 519
 520                 /* PM1B is optional */
 521
 522                 status =
 523                     acpi_hw_low_level_read(16, &value2,
 524                                            &acpi_gbl_FADT->xpm1b_evt_blk);
 525                 value1 |= value2;
 526                 break;
 527
 528         case ACPI_REGISTER_PM1_ENABLE:  /* 16-bit access */
 529
 530                 status =
 531                     acpi_hw_low_level_read(16, &value1, &acpi_gbl_xpm1a_enable);
 532                 if (ACPI_FAILURE(status)) {
 533                         goto unlock_and_exit;
 534                 }
 535
 536                 /* PM1B is optional */
 537
 538                 status =
 539                     acpi_hw_low_level_read(16, &value2, &acpi_gbl_xpm1b_enable);
 540                 value1 |= value2;
 541                 break;
 542
 543         case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */
 544
 545                 status =
 546                     acpi_hw_low_level_read(16, &value1,
 547                                            &acpi_gbl_FADT->xpm1a_cnt_blk);
 548                 if (ACPI_FAILURE(status)) {
 549                         goto unlock_and_exit;
 550                 }
 551
 552                 status =
 553                     acpi_hw_low_level_read(16, &value2,
 554                                            &acpi_gbl_FADT->xpm1b_cnt_blk);
 555                 value1 |= value2;
 556                 break;
 557
 558         case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */
 559
 560                 status =
 561                     acpi_hw_low_level_read(8, &value1,
 562                                            &acpi_gbl_FADT->xpm2_cnt_blk);
 563                 break;
 564
 565         case ACPI_REGISTER_PM_TIMER:    /* 32-bit access */
 566
 567                 status =
 568                     acpi_hw_low_level_read(32, &value1,
 569                                            &acpi_gbl_FADT->xpm_tmr_blk);
 570                 break;
 571
 572         case ACPI_REGISTER_SMI_COMMAND_BLOCK:   /* 8-bit access */
 573
 574                 status = acpi_os_read_port(acpi_gbl_FADT->smi_cmd, &value1, 8);
 575                 break;
 576
 577         default:
 578                 ACPI_ERROR((AE_INFO, "Unknown Register ID: %X", register_id));
 579                 status = AE_BAD_PARAMETER;
 580                 break;
 581         }
 582
 583       unlock_and_exit:
 584         if (ACPI_MTX_LOCK == use_lock) {
 585                 (void)acpi_ut_release_mutex(ACPI_MTX_HARDWARE);
 586         }
 587
 588         if (ACPI_SUCCESS(status)) {
 589                 *return_value = value1;
 590         }
 591
 592         return_ACPI_STATUS(status);
 593 }
 594
 595 /******************************************************************************
 596  *
 597  * FUNCTION:    acpi_hw_register_write
 598  *
 599  * PARAMETERS:  use_lock            - Mutex hw access
 600  *              register_id         - register_iD + Offset
 601  *              Value               - The value to write
 602  *
 603  * RETURN:      Status
 604  *
 605  * DESCRIPTION: Acpi register Write function.  Registers are written at the
 606  *              given offset.
 607  *
 608  ******************************************************************************/
 609
 610 acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value)
 611 {
 612         acpi_status status;
 613
 614         ACPI_FUNCTION_TRACE("hw_register_write");
 615
 616         if (ACPI_MTX_LOCK == use_lock) {
 617                 status = acpi_ut_acquire_mutex(ACPI_MTX_HARDWARE);
 618                 if (ACPI_FAILURE(status)) {
 619                         return_ACPI_STATUS(status);
 620                 }
 621         }
 622
 623         switch (register_id) {
 624         case ACPI_REGISTER_PM1_STATUS:  /* 16-bit access */
 625
 626                 status =
 627                     acpi_hw_low_level_write(16, value,
 628                                             &acpi_gbl_FADT->xpm1a_evt_blk);
 629                 if (ACPI_FAILURE(status)) {
 630                         goto unlock_and_exit;
 631                 }
 632
 633                 /* PM1B is optional */
 634
 635                 status =
 636                     acpi_hw_low_level_write(16, value,
 637                                             &acpi_gbl_FADT->xpm1b_evt_blk);
 638                 break;
 639
 640         case ACPI_REGISTER_PM1_ENABLE:  /* 16-bit access */
 641
 642                 status =
 643                     acpi_hw_low_level_write(16, value, &acpi_gbl_xpm1a_enable);
 644                 if (ACPI_FAILURE(status)) {
 645                         goto unlock_and_exit;
 646                 }
 647
 648                 /* PM1B is optional */
 649
 650                 status =
 651                     acpi_hw_low_level_write(16, value, &acpi_gbl_xpm1b_enable);
 652                 break;
 653
 654         case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */
 655
 656                 status =
 657                     acpi_hw_low_level_write(16, value,
 658                                             &acpi_gbl_FADT->xpm1a_cnt_blk);
 659                 if (ACPI_FAILURE(status)) {
 660                         goto unlock_and_exit;
 661                 }
 662
 663                 status =
 664                     acpi_hw_low_level_write(16, value,
 665                                             &acpi_gbl_FADT->xpm1b_cnt_blk);
 666                 break;
 667
 668         case ACPI_REGISTER_PM1A_CONTROL:        /* 16-bit access */
 669
 670                 status =
 671                     acpi_hw_low_level_write(16, value,
 672                                             &acpi_gbl_FADT->xpm1a_cnt_blk);
 673                 break;
 674
 675         case ACPI_REGISTER_PM1B_CONTROL:        /* 16-bit access */
 676
 677                 status =
 678                     acpi_hw_low_level_write(16, value,
 679                                             &acpi_gbl_FADT->xpm1b_cnt_blk);
 680                 break;
 681
 682         case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */
 683
 684                 status =
 685                     acpi_hw_low_level_write(8, value,
 686                                             &acpi_gbl_FADT->xpm2_cnt_blk);
 687                 break;
 688
 689         case ACPI_REGISTER_PM_TIMER:    /* 32-bit access */
 690
 691                 status =
 692                     acpi_hw_low_level_write(32, value,
 693                                             &acpi_gbl_FADT->xpm_tmr_blk);
 694                 break;
 695
 696         case ACPI_REGISTER_SMI_COMMAND_BLOCK:   /* 8-bit access */
 697
 698                 /* SMI_CMD is currently always in IO space */
 699
 700                 status = acpi_os_write_port(acpi_gbl_FADT->smi_cmd, value, 8);
 701                 break;
 702
 703         default:
 704                 status = AE_BAD_PARAMETER;
 705                 break;
 706         }
 707
 708       unlock_and_exit:
 709         if (ACPI_MTX_LOCK == use_lock) {
 710                 (void)acpi_ut_release_mutex(ACPI_MTX_HARDWARE);
 711         }
 712
 713         return_ACPI_STATUS(status);
 714 }
 715
 716 /******************************************************************************
 717  *
 718  * FUNCTION:    acpi_hw_low_level_read
 719  *
 720  * PARAMETERS:  Width               - 8, 16, or 32
 721  *              Value               - Where the value is returned
 722  *              Reg                 - GAS register structure
 723  *
 724  * RETURN:      Status
 725  *
 726  * DESCRIPTION: Read from either memory or IO space.
 727  *
 728  ******************************************************************************/
 729
 730 acpi_status
 731 acpi_hw_low_level_read(u32 width, u32 * value, struct acpi_generic_address *reg)
 732 {
 733         u64 address;
 734         acpi_status status;
 735
 736         ACPI_FUNCTION_NAME("hw_low_level_read");
 737
 738         /*
 739          * Must have a valid pointer to a GAS structure, and
 740          * a non-zero address within. However, don't return an error
 741          * because the PM1A/B code must not fail if B isn't present.
 742          */
 743         if (!reg) {
 744                 return (AE_OK);
 745         }
 746
 747         /* Get a local copy of the address.  Handles possible alignment issues */
 748
 749         ACPI_MOVE_64_TO_64(&address, &reg->address);
 750         if (!address) {
 751                 return (AE_OK);
 752         }
 753         *value = 0;
 754
 755         /*
 756          * Two address spaces supported: Memory or IO.
 757          * PCI_Config is not supported here because the GAS struct is insufficient
 758          */
 759         switch (reg->address_space_id) {
 760         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 761
 762                 status = acpi_os_read_memory((acpi_physical_address) address,
 763                                              value, width);
 764                 break;
 765
 766         case ACPI_ADR_SPACE_SYSTEM_IO:
 767
 768                 status = acpi_os_read_port((acpi_io_address) address,
 769                                            value, width);
 770                 break;
 771
 772         default:
 773                 ACPI_ERROR((AE_INFO,
 774                             "Unsupported address space: %X",
 775                             reg->address_space_id));
 776                 return (AE_BAD_PARAMETER);
 777         }
 778
 779         ACPI_DEBUG_PRINT((ACPI_DB_IO,
 780                           "Read:  %8.8X width %2d from %8.8X%8.8X (%s)\n",
 781                           *value, width,
 782                           ACPI_FORMAT_UINT64(address),
 783                           acpi_ut_get_region_name(reg->address_space_id)));
 784
 785         return (status);
 786 }
 787
 788 /******************************************************************************
 789  *
 790  * FUNCTION:    acpi_hw_low_level_write
 791  *
 792  * PARAMETERS:  Width               - 8, 16, or 32
 793  *              Value               - To be written
 794  *              Reg                 - GAS register structure
 795  *
 796  * RETURN:      Status
 797  *
 798  * DESCRIPTION: Write to either memory or IO space.
 799  *
 800  ******************************************************************************/
 801
 802 acpi_status
 803 acpi_hw_low_level_write(u32 width, u32 value, struct acpi_generic_address * reg)
 804 {
 805         u64 address;
 806         acpi_status status;
 807
 808         ACPI_FUNCTION_NAME("hw_low_level_write");
 809
 810         /*
 811          * Must have a valid pointer to a GAS structure, and
 812          * a non-zero address within. However, don't return an error
 813          * because the PM1A/B code must not fail if B isn't present.
 814          */
 815         if (!reg) {
 816                 return (AE_OK);
 817         }
 818
 819         /* Get a local copy of the address.  Handles possible alignment issues */
 820
 821         ACPI_MOVE_64_TO_64(&address, &reg->address);
 822         if (!address) {
 823                 return (AE_OK);
 824         }
 825
 826         /*
 827          * Two address spaces supported: Memory or IO.
 828          * PCI_Config is not supported here because the GAS struct is insufficient
 829          */
 830         switch (reg->address_space_id) {
 831         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 832
 833                 status = acpi_os_write_memory((acpi_physical_address) address,
 834                                               value, width);
 835                 break;
 836
 837         case ACPI_ADR_SPACE_SYSTEM_IO:
 838
 839                 status = acpi_os_write_port((acpi_io_address) address,
 840                                             value, width);
 841                 break;
 842
 843         default:
 844                 ACPI_ERROR((AE_INFO,
 845                             "Unsupported address space: %X",
 846                             reg->address_space_id));
 847                 return (AE_BAD_PARAMETER);
 848         }
 849
 850         ACPI_DEBUG_PRINT((ACPI_DB_IO,
 851                           "Wrote: %8.8X width %2d   to %8.8X%8.8X (%s)\n",
 852                           value, width,
 853                           ACPI_FORMAT_UINT64(address),
 854                           acpi_ut_get_region_name(reg->address_space_id)));
 855
 856         return (status);
 857 }