git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/acpica/hwxface.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: hwxface - Public ACPICA hardware interfaces
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2008, Intel Corp.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include "accommon.h"
  47 #include "acnamesp.h"
  48
  49 #define _COMPONENT          ACPI_HARDWARE
  50 ACPI_MODULE_NAME("hwxface")
  51
  52 /******************************************************************************
  53  *
  54  * FUNCTION:    acpi_reset
  55  *
  56  * PARAMETERS:  None
  57  *
  58  * RETURN:      Status
  59  *
  60  * DESCRIPTION: Set reset register in memory or IO space. Note: Does not
  61  *              support reset register in PCI config space, this must be
  62  *              handled separately.
  63  *
  64  ******************************************************************************/
  65 acpi_status acpi_reset(void)
  66 {
  67         struct acpi_generic_address *reset_reg;
  68         acpi_status status;
  69
  70         ACPI_FUNCTION_TRACE(acpi_reset);
  71
  72         reset_reg = &acpi_gbl_FADT.reset_register;
  73
  74         /* Check if the reset register is supported */
  75
  76         if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) ||
  77             !reset_reg->address) {
  78                 return_ACPI_STATUS(AE_NOT_EXIST);
  79         }
  80
  81         /* Write the reset value to the reset register */
  82
  83         status = acpi_write(acpi_gbl_FADT.reset_value, reset_reg);
  84         return_ACPI_STATUS(status);
  85 }
  86
  87 ACPI_EXPORT_SYMBOL(acpi_reset)
  88
  89 /******************************************************************************
  90  *
  91  * FUNCTION:    acpi_read
  92  *
  93  * PARAMETERS:  Value               - Where the value is returned
  94  *              Reg                 - GAS register structure
  95  *
  96  * RETURN:      Status
  97  *
  98  * DESCRIPTION: Read from either memory or IO space.
  99  *
 100  ******************************************************************************/
 101 acpi_status acpi_read(u32 *value, struct acpi_generic_address *reg)
 102 {
 103         u32 width;
 104         u64 address;
 105         acpi_status status;
 106
 107         ACPI_FUNCTION_NAME(acpi_read);
 108
 109         /*
 110          * Must have a valid pointer to a GAS structure, and
 111          * a non-zero address within. However, don't return an error
 112          * because the PM1A/B code must not fail if B isn't present.
 113          */
 114         if (!reg) {
 115                 return (AE_OK);
 116         }
 117
 118         /* Get a local copy of the address. Handles possible alignment issues */
 119
 120         ACPI_MOVE_64_TO_64(&address, &reg->address);
 121         if (!address) {
 122                 return (AE_OK);
 123         }
 124
 125         /* Supported widths are 8/16/32 */
 126
 127         width = reg->bit_width;
 128         if ((width != 8) && (width != 16) && (width != 32)) {
 129                 return (AE_SUPPORT);
 130         }
 131
 132         /* Initialize entire 32-bit return value to zero */
 133
 134         *value = 0;
 135
 136         /*
 137          * Two address spaces supported: Memory or IO.
 138          * PCI_Config is not supported here because the GAS struct is insufficient
 139          */
 140         switch (reg->space_id) {
 141         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 142
 143                 status = acpi_os_read_memory((acpi_physical_address) address,
 144                                              value, width);
 145                 break;
 146
 147         case ACPI_ADR_SPACE_SYSTEM_IO:
 148
 149                 status =
 150                     acpi_os_read_port((acpi_io_address) address, value, width);
 151                 break;
 152
 153         default:
 154                 ACPI_ERROR((AE_INFO,
 155                             "Unsupported address space: %X", reg->space_id));
 156                 return (AE_BAD_PARAMETER);
 157         }
 158
 159         ACPI_DEBUG_PRINT((ACPI_DB_IO,
 160                           "Read:  %8.8X width %2d from %8.8X%8.8X (%s)\n",
 161                           *value, width, ACPI_FORMAT_UINT64(address),
 162                           acpi_ut_get_region_name(reg->space_id)));
 163
 164         return (status);
 165 }
 166
 167 ACPI_EXPORT_SYMBOL(acpi_read)
 168
 169 /******************************************************************************
 170  *
 171  * FUNCTION:    acpi_write
 172  *
 173  * PARAMETERS:  Value               - To be written
 174  *              Reg                 - GAS register structure
 175  *
 176  * RETURN:      Status
 177  *
 178  * DESCRIPTION: Write to either memory or IO space.
 179  *
 180  ******************************************************************************/
 181 acpi_status acpi_write(u32 value, struct acpi_generic_address *reg)
 182 {
 183         u32 width;
 184         u64 address;
 185         acpi_status status;
 186
 187         ACPI_FUNCTION_NAME(acpi_write);
 188
 189         /*
 190          * Must have a valid pointer to a GAS structure, and
 191          * a non-zero address within. However, don't return an error
 192          * because the PM1A/B code must not fail if B isn't present.
 193          */
 194         if (!reg) {
 195                 return (AE_OK);
 196         }
 197
 198         /* Get a local copy of the address. Handles possible alignment issues */
 199
 200         ACPI_MOVE_64_TO_64(&address, &reg->address);
 201         if (!address) {
 202                 return (AE_OK);
 203         }
 204
 205         /* Supported widths are 8/16/32 */
 206
 207         width = reg->bit_width;
 208         if ((width != 8) && (width != 16) && (width != 32)) {
 209                 return (AE_SUPPORT);
 210         }
 211
 212         /*
 213          * Two address spaces supported: Memory or IO.
 214          * PCI_Config is not supported here because the GAS struct is insufficient
 215          */
 216         switch (reg->space_id) {
 217         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 218
 219                 status = acpi_os_write_memory((acpi_physical_address) address,
 220                                               value, width);
 221                 break;
 222
 223         case ACPI_ADR_SPACE_SYSTEM_IO:
 224
 225                 status = acpi_os_write_port((acpi_io_address) address, value,
 226                                             width);
 227                 break;
 228
 229         default:
 230                 ACPI_ERROR((AE_INFO,
 231                             "Unsupported address space: %X", reg->space_id));
 232                 return (AE_BAD_PARAMETER);
 233         }
 234
 235         ACPI_DEBUG_PRINT((ACPI_DB_IO,
 236                           "Wrote: %8.8X width %2d   to %8.8X%8.8X (%s)\n",
 237                           value, width, ACPI_FORMAT_UINT64(address),
 238                           acpi_ut_get_region_name(reg->space_id)));
 239
 240         return (status);
 241 }
 242
 243 ACPI_EXPORT_SYMBOL(acpi_write)
 244
 245 /*******************************************************************************
 246  *
 247  * FUNCTION:    acpi_get_register_unlocked
 248  *
 249  * PARAMETERS:  register_id     - ID of ACPI bit_register to access
 250  *              return_value    - Value that was read from the register
 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. Does not acquire the HW lock.
 256  *
 257  ******************************************************************************/
 258 acpi_status acpi_get_register_unlocked(u32 register_id, u32 *return_value)
 259 {
 260         u32 register_value = 0;
 261         struct acpi_bit_register_info *bit_reg_info;
 262         acpi_status status;
 263
 264         ACPI_FUNCTION_TRACE(acpi_get_register_unlocked);
 265
 266         /* Get the info structure corresponding to the requested ACPI Register */
 267
 268         bit_reg_info = acpi_hw_get_bit_register_info(register_id);
 269         if (!bit_reg_info) {
 270                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 271         }
 272
 273         /* Read from the register */
 274
 275         status = acpi_hw_register_read(bit_reg_info->parent_register,
 276                                        &register_value);
 277
 278         if (ACPI_SUCCESS(status)) {
 279
 280                 /* Normalize the value that was read */
 281
 282                 register_value =
 283                     ((register_value & bit_reg_info->access_bit_mask)
 284                      >> bit_reg_info->bit_position);
 285
 286                 *return_value = register_value;
 287
 288                 ACPI_DEBUG_PRINT((ACPI_DB_IO, "Read value %8.8X register %X\n",
 289                                   register_value,
 290                                   bit_reg_info->parent_register));
 291         }
 292
 293         return_ACPI_STATUS(status);
 294 }
 295
 296 ACPI_EXPORT_SYMBOL(acpi_get_register_unlocked)
 297
 298 /*******************************************************************************
 299  *
 300  * FUNCTION:    acpi_get_register
 301  *
 302  * PARAMETERS:  register_id     - ID of ACPI bit_register to access
 303  *              return_value    - Value that was read from the register
 304  *
 305  * RETURN:      Status and the value read from specified Register. Value
 306  *              returned is normalized to bit0 (is shifted all the way right)
 307  *
 308  * DESCRIPTION: ACPI bit_register read function.
 309  *
 310  ******************************************************************************/
 311 acpi_status acpi_get_register(u32 register_id, u32 *return_value)
 312 {
 313         acpi_status status;
 314         acpi_cpu_flags flags;
 315
 316         flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
 317         status = acpi_get_register_unlocked(register_id, return_value);
 318         acpi_os_release_lock(acpi_gbl_hardware_lock, flags);
 319
 320         return (status);
 321 }
 322
 323 ACPI_EXPORT_SYMBOL(acpi_get_register)
 324
 325 /*******************************************************************************
 326  *
 327  * FUNCTION:    acpi_set_register
 328  *
 329  * PARAMETERS:  register_id     - ID of ACPI bit_register to access
 330  *              Value           - (only used on write) value to write to the
 331  *                                Register, NOT pre-normalized to the bit pos
 332  *
 333  * RETURN:      Status
 334  *
 335  * DESCRIPTION: ACPI Bit Register write function.
 336  *
 337  ******************************************************************************/
 338 acpi_status acpi_set_register(u32 register_id, u32 value)
 339 {
 340         u32 register_value = 0;
 341         struct acpi_bit_register_info *bit_reg_info;
 342         acpi_status status;
 343         acpi_cpu_flags lock_flags;
 344
 345         ACPI_FUNCTION_TRACE_U32(acpi_set_register, register_id);
 346
 347         /* Get the info structure corresponding to the requested ACPI Register */
 348
 349         bit_reg_info = acpi_hw_get_bit_register_info(register_id);
 350         if (!bit_reg_info) {
 351                 ACPI_ERROR((AE_INFO, "Bad ACPI HW RegisterId: %X",
 352                             register_id));
 353                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 354         }
 355
 356         lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
 357
 358         /* Always do a register read first so we can insert the new bits  */
 359
 360         status = acpi_hw_register_read(bit_reg_info->parent_register,
 361                                        &register_value);
 362         if (ACPI_FAILURE(status)) {
 363                 goto unlock_and_exit;
 364         }
 365
 366         /*
 367          * Decode the Register ID
 368          * Register ID = [Register block ID] | [bit ID]
 369          *
 370          * Check bit ID to fine locate Register offset.
 371          * Check Mask to determine Register offset, and then read-write.
 372          */
 373         switch (bit_reg_info->parent_register) {
 374         case ACPI_REGISTER_PM1_STATUS:
 375
 376                 /*
 377                  * Status Registers are different from the rest. Clear by
 378                  * writing 1, and writing 0 has no effect. So, the only relevant
 379                  * information is the single bit we're interested in, all others should
 380                  * be written as 0 so they will be left unchanged.
 381                  */
 382                 value = ACPI_REGISTER_PREPARE_BITS(value,
 383                                                    bit_reg_info->bit_position,
 384                                                    bit_reg_info->
 385                                                    access_bit_mask);
 386                 if (value) {
 387                         status =
 388                             acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,
 389                                                    (u16) value);
 390                         register_value = 0;
 391                 }
 392                 break;
 393
 394         case ACPI_REGISTER_PM1_ENABLE:
 395
 396                 ACPI_REGISTER_INSERT_VALUE(register_value,
 397                                            bit_reg_info->bit_position,
 398                                            bit_reg_info->access_bit_mask,
 399                                            value);
 400
 401                 status = acpi_hw_register_write(ACPI_REGISTER_PM1_ENABLE,
 402                                                 (u16) register_value);
 403                 break;
 404
 405         case ACPI_REGISTER_PM1_CONTROL:
 406
 407                 /*
 408                  * Write the PM1 Control register.
 409                  * Note that at this level, the fact that there are actually TWO
 410                  * registers (A and B - and B may not exist) is abstracted.
 411                  */
 412                 ACPI_DEBUG_PRINT((ACPI_DB_IO, "PM1 control: Read %X\n",
 413                                   register_value));
 414
 415                 ACPI_REGISTER_INSERT_VALUE(register_value,
 416                                            bit_reg_info->bit_position,
 417                                            bit_reg_info->access_bit_mask,
 418                                            value);
 419
 420                 status = acpi_hw_register_write(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_REGISTER_PM2_CONTROL,
 427                                                &register_value);
 428                 if (ACPI_FAILURE(status)) {
 429                         goto unlock_and_exit;
 430                 }
 431
 432                 ACPI_DEBUG_PRINT((ACPI_DB_IO,
 433                                   "PM2 control: Read %X from %8.8X%8.8X\n",
 434                                   register_value,
 435                                   ACPI_FORMAT_UINT64(acpi_gbl_FADT.
 436                                                      xpm2_control_block.
 437                                                      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_control_block.
 449                                                      address)));
 450
 451                 status = acpi_hw_register_write(ACPI_REGISTER_PM2_CONTROL,
 452                                                 (u8) (register_value));
 453                 break;
 454
 455         default:
 456                 break;
 457         }
 458
 459       unlock_and_exit:
 460
 461         acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
 462
 463         /* Normalize the value that was read */
 464
 465         ACPI_DEBUG_EXEC(register_value =
 466                         ((register_value & bit_reg_info->access_bit_mask) >>
 467                          bit_reg_info->bit_position));
 468
 469         ACPI_DEBUG_PRINT((ACPI_DB_IO,
 470                           "Set bits: %8.8X actual %8.8X register %X\n", value,
 471                           register_value, bit_reg_info->parent_register));
 472         return_ACPI_STATUS(status);
 473 }
 474
 475 ACPI_EXPORT_SYMBOL(acpi_set_register)
 476
 477 /*******************************************************************************
 478  *
 479  * FUNCTION:    acpi_get_sleep_type_data
 480  *
 481  * PARAMETERS:  sleep_state         - Numeric sleep state
 482  *              *sleep_type_a        - Where SLP_TYPa is returned
 483  *              *sleep_type_b        - Where SLP_TYPb is returned
 484  *
 485  * RETURN:      Status - ACPI status
 486  *
 487  * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep
 488  *              state.
 489  *
 490  ******************************************************************************/
 491 acpi_status
 492 acpi_get_sleep_type_data(u8 sleep_state, u8 *sleep_type_a, u8 *sleep_type_b)
 493 {
 494         acpi_status status = AE_OK;
 495         struct acpi_evaluate_info *info;
 496
 497         ACPI_FUNCTION_TRACE(acpi_get_sleep_type_data);
 498
 499         /* Validate parameters */
 500
 501         if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) {
 502                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 503         }
 504
 505         /* Allocate the evaluation information block */
 506
 507         info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 508         if (!info) {
 509                 return_ACPI_STATUS(AE_NO_MEMORY);
 510         }
 511
 512         info->pathname =
 513             ACPI_CAST_PTR(char, acpi_gbl_sleep_state_names[sleep_state]);
 514
 515         /* Evaluate the namespace object containing the values for this state */
 516
 517         status = acpi_ns_evaluate(info);
 518         if (ACPI_FAILURE(status)) {
 519                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 520                                   "%s while evaluating SleepState [%s]\n",
 521                                   acpi_format_exception(status),
 522                                   info->pathname));
 523
 524                 goto cleanup;
 525         }
 526
 527         /* Must have a return object */
 528
 529         if (!info->return_object) {
 530                 ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]",
 531                             info->pathname));
 532                 status = AE_NOT_EXIST;
 533         }
 534
 535         /* It must be of type Package */
 536
 537         else if (ACPI_GET_OBJECT_TYPE(info->return_object) != ACPI_TYPE_PACKAGE) {
 538                 ACPI_ERROR((AE_INFO,
 539                             "Sleep State return object is not a Package"));
 540                 status = AE_AML_OPERAND_TYPE;
 541         }
 542
 543         /*
 544          * The package must have at least two elements. NOTE (March 2005): This
 545          * goes against the current ACPI spec which defines this object as a
 546          * package with one encoded DWORD element. However, existing practice
 547          * by BIOS vendors seems to be to have 2 or more elements, at least
 548          * one per sleep type (A/B).
 549          */
 550         else if (info->return_object->package.count < 2) {
 551                 ACPI_ERROR((AE_INFO,
 552                             "Sleep State return package does not have at least two elements"));
 553                 status = AE_AML_NO_OPERAND;
 554         }
 555
 556         /* The first two elements must both be of type Integer */
 557
 558         else if ((ACPI_GET_OBJECT_TYPE(info->return_object->package.elements[0])
 559                   != ACPI_TYPE_INTEGER) ||
 560                  (ACPI_GET_OBJECT_TYPE(info->return_object->package.elements[1])
 561                   != ACPI_TYPE_INTEGER)) {
 562                 ACPI_ERROR((AE_INFO,
 563                             "Sleep State return package elements are not both Integers (%s, %s)",
 564                             acpi_ut_get_object_type_name(info->return_object->
 565                                                          package.elements[0]),
 566                             acpi_ut_get_object_type_name(info->return_object->
 567                                                          package.elements[1])));
 568                 status = AE_AML_OPERAND_TYPE;
 569         } else {
 570                 /* Valid _Sx_ package size, type, and value */
 571
 572                 *sleep_type_a = (u8)
 573                     (info->return_object->package.elements[0])->integer.value;
 574                 *sleep_type_b = (u8)
 575                     (info->return_object->package.elements[1])->integer.value;
 576         }
 577
 578         if (ACPI_FAILURE(status)) {
 579                 ACPI_EXCEPTION((AE_INFO, status,
 580                                 "While evaluating SleepState [%s], bad Sleep object %p type %s",
 581                                 info->pathname, info->return_object,
 582                                 acpi_ut_get_object_type_name(info->
 583                                                              return_object)));
 584         }
 585
 586         acpi_ut_remove_reference(info->return_object);
 587
 588       cleanup:
 589         ACPI_FREE(info);
 590         return_ACPI_STATUS(status);
 591 }
 592
 593 ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data)