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