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 a non-zero address
 111          * within.
 112          */
 113         if (!reg) {
 114                 return (AE_BAD_PARAMETER);
 115         }
 116
 117         /* Get a local copy of the address. Handles possible alignment issues */
 118
 119         ACPI_MOVE_64_TO_64(&address, &reg->address);
 120         if (!address) {
 121                 return (AE_BAD_ADDRESS);
 122         }
 123
 124         /* Supported widths are 8/16/32 */
 125
 126         width = reg->bit_width;
 127         if ((width != 8) && (width != 16) && (width != 32)) {
 128                 return (AE_SUPPORT);
 129         }
 130
 131         /* Initialize entire 32-bit return value to zero */
 132
 133         *value = 0;
 134
 135         /*
 136          * Two address spaces supported: Memory or IO. PCI_Config is
 137          * not supported here because the GAS structure is insufficient
 138          */
 139         switch (reg->space_id) {
 140         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 141
 142                 status = acpi_os_read_memory((acpi_physical_address) address,
 143                                              value, width);
 144                 break;
 145
 146         case ACPI_ADR_SPACE_SYSTEM_IO:
 147
 148                 status =
 149                     acpi_hw_read_port((acpi_io_address) address, value, width);
 150                 break;
 151
 152         default:
 153                 ACPI_ERROR((AE_INFO,
 154                             "Unsupported address space: %X", reg->space_id));
 155                 return (AE_BAD_PARAMETER);
 156         }
 157
 158         ACPI_DEBUG_PRINT((ACPI_DB_IO,
 159                           "Read:  %8.8X width %2d from %8.8X%8.8X (%s)\n",
 160                           *value, width, ACPI_FORMAT_UINT64(address),
 161                           acpi_ut_get_region_name(reg->space_id)));
 162
 163         return (status);
 164 }
 165
 166 ACPI_EXPORT_SYMBOL(acpi_read)
 167
 168 /******************************************************************************
 169  *
 170  * FUNCTION:    acpi_write
 171  *
 172  * PARAMETERS:  Value               - To be written
 173  *              Reg                 - GAS register structure
 174  *
 175  * RETURN:      Status
 176  *
 177  * DESCRIPTION: Write to either memory or IO space.
 178  *
 179  ******************************************************************************/
 180 acpi_status acpi_write(u32 value, struct acpi_generic_address *reg)
 181 {
 182         u32 width;
 183         u64 address;
 184         acpi_status status;
 185
 186         ACPI_FUNCTION_NAME(acpi_write);
 187
 188         /*
 189          * Must have a valid pointer to a GAS structure, and a non-zero address
 190          * within.
 191          */
 192         if (!reg) {
 193                 return (AE_BAD_PARAMETER);
 194         }
 195
 196         /* Get a local copy of the address. Handles possible alignment issues */
 197
 198         ACPI_MOVE_64_TO_64(&address, &reg->address);
 199         if (!address) {
 200                 return (AE_BAD_ADDRESS);
 201         }
 202
 203         /* Supported widths are 8/16/32 */
 204
 205         width = reg->bit_width;
 206         if ((width != 8) && (width != 16) && (width != 32)) {
 207                 return (AE_SUPPORT);
 208         }
 209
 210         /*
 211          * Two address spaces supported: Memory or IO.
 212          * PCI_Config is not supported here because the GAS struct is insufficient
 213          */
 214         switch (reg->space_id) {
 215         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 216
 217                 status = acpi_os_write_memory((acpi_physical_address) address,
 218                                               value, width);
 219                 break;
 220
 221         case ACPI_ADR_SPACE_SYSTEM_IO:
 222
 223                 status = acpi_hw_write_port((acpi_io_address) address, value,
 224                                             width);
 225                 break;
 226
 227         default:
 228                 ACPI_ERROR((AE_INFO,
 229                             "Unsupported address space: %X", reg->space_id));
 230                 return (AE_BAD_PARAMETER);
 231         }
 232
 233         ACPI_DEBUG_PRINT((ACPI_DB_IO,
 234                           "Wrote: %8.8X width %2d   to %8.8X%8.8X (%s)\n",
 235                           value, width, ACPI_FORMAT_UINT64(address),
 236                           acpi_ut_get_region_name(reg->space_id)));
 237
 238         return (status);
 239 }
 240
 241 ACPI_EXPORT_SYMBOL(acpi_write)
 242
 243 /*******************************************************************************
 244  *
 245  * FUNCTION:    acpi_read_bit_register
 246  *
 247  * PARAMETERS:  register_id     - ID of ACPI Bit Register to access
 248  *              return_value    - Value that was read from the register,
 249  *                                normalized to bit position zero.
 250  *
 251  * RETURN:      Status and the value read from the specified Register. Value
 252  *              returned is normalized to bit0 (is shifted all the way right)
 253  *
 254  * DESCRIPTION: ACPI bit_register read function. Does not acquire the HW lock.
 255  *
 256  * SUPPORTS:    Bit fields in PM1 Status, PM1 Enable, PM1 Control, and
 257  *              PM2 Control.
 258  *
 259  * Note: The hardware lock is not required when reading the ACPI bit registers
 260  *       since almost all of them are single bit and it does not matter that
 261  *       the parent hardware register can be split across two physical
 262  *       registers. The only multi-bit field is SLP_TYP in the PM1 control
 263  *       register, but this field does not cross an 8-bit boundary (nor does
 264  *       it make much sense to actually read this field.)
 265  *
 266  ******************************************************************************/
 267 acpi_status acpi_read_bit_register(u32 register_id, u32 *return_value)
 268 {
 269         struct acpi_bit_register_info *bit_reg_info;
 270         u32 register_value;
 271         u32 value;
 272         acpi_status status;
 273
 274         ACPI_FUNCTION_TRACE_U32(acpi_read_bit_register, register_id);
 275
 276         /* Get the info structure corresponding to the requested ACPI Register */
 277
 278         bit_reg_info = acpi_hw_get_bit_register_info(register_id);
 279         if (!bit_reg_info) {
 280                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 281         }
 282
 283         /* Read the entire parent register */
 284
 285         status = acpi_hw_register_read(bit_reg_info->parent_register,
 286                                        &register_value);
 287         if (ACPI_FAILURE(status)) {
 288                 return_ACPI_STATUS(status);
 289         }
 290
 291         /* Normalize the value that was read, mask off other bits */
 292
 293         value = ((register_value & bit_reg_info->access_bit_mask)
 294                  >> bit_reg_info->bit_position);
 295
 296         ACPI_DEBUG_PRINT((ACPI_DB_IO,
 297                           "BitReg %X, ParentReg %X, Actual %8.8X, ReturnValue %8.8X\n",
 298                           register_id, bit_reg_info->parent_register,
 299                           register_value, value));
 300
 301         *return_value = value;
 302         return_ACPI_STATUS(AE_OK);
 303 }
 304
 305 ACPI_EXPORT_SYMBOL(acpi_read_bit_register)
 306
 307 /*******************************************************************************
 308  *
 309  * FUNCTION:    acpi_write_bit_register
 310  *
 311  * PARAMETERS:  register_id     - ID of ACPI Bit Register to access
 312  *              Value           - Value to write to the register, in bit
 313  *                                position zero. The bit is automaticallly
 314  *                                shifted to the correct position.
 315  *
 316  * RETURN:      Status
 317  *
 318  * DESCRIPTION: ACPI Bit Register write function. Acquires the hardware lock
 319  *              since most operations require a read/modify/write sequence.
 320  *
 321  * SUPPORTS:    Bit fields in PM1 Status, PM1 Enable, PM1 Control, and
 322  *              PM2 Control.
 323  *
 324  * Note that at this level, the fact that there may be actually two
 325  * hardware registers (A and B - and B may not exist) is abstracted.
 326  *
 327  ******************************************************************************/
 328 acpi_status acpi_write_bit_register(u32 register_id, u32 value)
 329 {
 330         struct acpi_bit_register_info *bit_reg_info;
 331         acpi_cpu_flags lock_flags;
 332         u32 register_value;
 333         acpi_status status = AE_OK;
 334
 335         ACPI_FUNCTION_TRACE_U32(acpi_write_bit_register, register_id);
 336
 337         /* Get the info structure corresponding to the requested ACPI Register */
 338
 339         bit_reg_info = acpi_hw_get_bit_register_info(register_id);
 340         if (!bit_reg_info) {
 341                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 342         }
 343
 344         lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
 345
 346         /*
 347          * At this point, we know that the parent register is one of the
 348          * following: PM1 Status, PM1 Enable, PM1 Control, or PM2 Control
 349          */
 350         if (bit_reg_info->parent_register != ACPI_REGISTER_PM1_STATUS) {
 351                 /*
 352                  * 1) Case for PM1 Enable, PM1 Control, and PM2 Control
 353                  *
 354                  * Perform a register read to preserve the bits that we are not
 355                  * interested in
 356                  */
 357                 status = acpi_hw_register_read(bit_reg_info->parent_register,
 358                                                &register_value);
 359                 if (ACPI_FAILURE(status)) {
 360                         goto unlock_and_exit;
 361                 }
 362
 363                 /*
 364                  * Insert the input bit into the value that was just read
 365                  * and write the register
 366                  */
 367                 ACPI_REGISTER_INSERT_VALUE(register_value,
 368                                            bit_reg_info->bit_position,
 369                                            bit_reg_info->access_bit_mask,
 370                                            value);
 371
 372                 status = acpi_hw_register_write(bit_reg_info->parent_register,
 373                                                 register_value);
 374         } else {
 375                 /*
 376                  * 2) Case for PM1 Status
 377                  *
 378                  * The Status register is different from the rest. Clear an event
 379                  * by writing 1, writing 0 has no effect. So, the only relevant
 380                  * information is the single bit we're interested in, all others
 381                  * should be written as 0 so they will be left unchanged.
 382                  */
 383                 register_value = ACPI_REGISTER_PREPARE_BITS(value,
 384                                                             bit_reg_info->
 385                                                             bit_position,
 386                                                             bit_reg_info->
 387                                                             access_bit_mask);
 388
 389                 /* No need to write the register if value is all zeros */
 390
 391                 if (register_value) {
 392                         status =
 393                             acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,
 394                                                    register_value);
 395                 }
 396         }
 397
 398         ACPI_DEBUG_PRINT((ACPI_DB_IO,
 399                           "BitReg %X, ParentReg %X, Value %8.8X, Actual %8.8X\n",
 400                           register_id, bit_reg_info->parent_register, value,
 401                           register_value));
 402
 403 unlock_and_exit:
 404
 405         acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
 406         return_ACPI_STATUS(status);
 407 }
 408
 409 ACPI_EXPORT_SYMBOL(acpi_write_bit_register)
 410
 411 /*******************************************************************************
 412  *
 413  * FUNCTION:    acpi_get_sleep_type_data
 414  *
 415  * PARAMETERS:  sleep_state         - Numeric sleep state
 416  *              *sleep_type_a        - Where SLP_TYPa is returned
 417  *              *sleep_type_b        - Where SLP_TYPb is returned
 418  *
 419  * RETURN:      Status - ACPI status
 420  *
 421  * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep
 422  *              state.
 423  *
 424  ******************************************************************************/
 425 acpi_status
 426 acpi_get_sleep_type_data(u8 sleep_state, u8 *sleep_type_a, u8 *sleep_type_b)
 427 {
 428         acpi_status status = AE_OK;
 429         struct acpi_evaluate_info *info;
 430
 431         ACPI_FUNCTION_TRACE(acpi_get_sleep_type_data);
 432
 433         /* Validate parameters */
 434
 435         if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) {
 436                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 437         }
 438
 439         /* Allocate the evaluation information block */
 440
 441         info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 442         if (!info) {
 443                 return_ACPI_STATUS(AE_NO_MEMORY);
 444         }
 445
 446         info->pathname =
 447             ACPI_CAST_PTR(char, acpi_gbl_sleep_state_names[sleep_state]);
 448
 449         /* Evaluate the namespace object containing the values for this state */
 450
 451         status = acpi_ns_evaluate(info);
 452         if (ACPI_FAILURE(status)) {
 453                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 454                                   "%s while evaluating SleepState [%s]\n",
 455                                   acpi_format_exception(status),
 456                                   info->pathname));
 457
 458                 goto cleanup;
 459         }
 460
 461         /* Must have a return object */
 462
 463         if (!info->return_object) {
 464                 ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]",
 465                             info->pathname));
 466                 status = AE_NOT_EXIST;
 467         }
 468
 469         /* It must be of type Package */
 470
 471         else if (info->return_object->common.type != ACPI_TYPE_PACKAGE) {
 472                 ACPI_ERROR((AE_INFO,
 473                             "Sleep State return object is not a Package"));
 474                 status = AE_AML_OPERAND_TYPE;
 475         }
 476
 477         /*
 478          * The package must have at least two elements. NOTE (March 2005): This
 479          * goes against the current ACPI spec which defines this object as a
 480          * package with one encoded DWORD element. However, existing practice
 481          * by BIOS vendors seems to be to have 2 or more elements, at least
 482          * one per sleep type (A/B).
 483          */
 484         else if (info->return_object->package.count < 2) {
 485                 ACPI_ERROR((AE_INFO,
 486                             "Sleep State return package does not have at least two elements"));
 487                 status = AE_AML_NO_OPERAND;
 488         }
 489
 490         /* The first two elements must both be of type Integer */
 491
 492         else if (((info->return_object->package.elements[0])->common.type
 493                   != ACPI_TYPE_INTEGER) ||
 494                  ((info->return_object->package.elements[1])->common.type
 495                   != ACPI_TYPE_INTEGER)) {
 496                 ACPI_ERROR((AE_INFO,
 497                             "Sleep State return package elements are not both Integers "
 498                             "(%s, %s)",
 499                             acpi_ut_get_object_type_name(info->return_object->
 500                                                          package.elements[0]),
 501                             acpi_ut_get_object_type_name(info->return_object->
 502                                                          package.elements[1])));
 503                 status = AE_AML_OPERAND_TYPE;
 504         } else {
 505                 /* Valid _Sx_ package size, type, and value */
 506
 507                 *sleep_type_a = (u8)
 508                     (info->return_object->package.elements[0])->integer.value;
 509                 *sleep_type_b = (u8)
 510                     (info->return_object->package.elements[1])->integer.value;
 511         }
 512
 513         if (ACPI_FAILURE(status)) {
 514                 ACPI_EXCEPTION((AE_INFO, status,
 515                                 "While evaluating SleepState [%s], bad Sleep object %p type %s",
 516                                 info->pathname, info->return_object,
 517                                 acpi_ut_get_object_type_name(info->
 518                                                              return_object)));
 519         }
 520
 521         acpi_ut_remove_reference(info->return_object);
 522
 523       cleanup:
 524         ACPI_FREE(info);
 525         return_ACPI_STATUS(status);
 526 }
 527
 528 ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data)