drivers/acpi/acpica/hwxface.c

   1 /******************************************************************************
   2  *
   3  * Module Name: hwxface - Public ACPICA hardware interfaces
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #define EXPORT_ACPI_INTERFACES
  45
  46 #include <acpi/acpi.h>
  47 #include "accommon.h"
  48 #include "acnamesp.h"
  49
  50 #define _COMPONENT          ACPI_HARDWARE
  51 ACPI_MODULE_NAME("hwxface")
  52
  53 /******************************************************************************
  54  *
  55  * FUNCTION:    acpi_reset
  56  *
  57  * PARAMETERS:  None
  58  *
  59  * RETURN:      Status
  60  *
  61  * DESCRIPTION: Set reset register in memory or IO space. Note: Does not
  62  *              support reset register in PCI config space, this must be
  63  *              handled separately.
  64  *
  65  ******************************************************************************/
  66 acpi_status acpi_reset(void)
  67 {
  68         struct acpi_generic_address *reset_reg;
  69         acpi_status status;
  70
  71         ACPI_FUNCTION_TRACE(acpi_reset);
  72
  73         reset_reg = &acpi_gbl_FADT.reset_register;
  74
  75         /* Check if the reset register is supported */
  76
  77         if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) ||
  78             !reset_reg->address) {
  79                 return_ACPI_STATUS(AE_NOT_EXIST);
  80         }
  81
  82         if (reset_reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
  83                 /*
  84                  * For I/O space, write directly to the OSL. This bypasses the port
  85                  * validation mechanism, which may block a valid write to the reset
  86                  * register.
  87                  *
  88                  * NOTE:
  89                  * The ACPI spec requires the reset register width to be 8, so we
  90                  * hardcode it here and ignore the FADT value. This maintains
  91                  * compatibility with other ACPI implementations that have allowed
  92                  * BIOS code with bad register width values to go unnoticed.
  93                  */
  94                 status =
  95                     acpi_os_write_port((acpi_io_address) reset_reg->address,
  96                                        acpi_gbl_FADT.reset_value,
  97                                        ACPI_RESET_REGISTER_WIDTH);
  98         } else {
  99                 /* Write the reset value to the reset register */
 100
 101                 status = acpi_hw_write(acpi_gbl_FADT.reset_value, reset_reg);
 102         }
 103
 104         return_ACPI_STATUS(status);
 105 }
 106
 107 ACPI_EXPORT_SYMBOL(acpi_reset)
 108
 109 /******************************************************************************
 110  *
 111  * FUNCTION:    acpi_read
 112  *
 113  * PARAMETERS:  value               - Where the value is returned
 114  *              reg                 - GAS register structure
 115  *
 116  * RETURN:      Status
 117  *
 118  * DESCRIPTION: Read from either memory or IO space.
 119  *
 120  * LIMITATIONS: <These limitations also apply to acpi_write>
 121  *      bit_width must be exactly 8, 16, 32, or 64.
 122  *      space_ID must be system_memory or system_IO.
 123  *      bit_offset and access_width are currently ignored, as there has
 124  *          not been a need to implement these.
 125  *
 126  ******************************************************************************/
 127 acpi_status acpi_read(u64 *return_value, struct acpi_generic_address *reg)
 128 {
 129         u32 value_lo;
 130         u32 value_hi;
 131         u32 width;
 132         u64 address;
 133         acpi_status status;
 134
 135         ACPI_FUNCTION_NAME(acpi_read);
 136
 137         if (!return_value) {
 138                 return (AE_BAD_PARAMETER);
 139         }
 140
 141         /* Validate contents of the GAS register. Allow 64-bit transfers */
 142
 143         status = acpi_hw_validate_register(reg, 64, &address);
 144         if (ACPI_FAILURE(status)) {
 145                 return (status);
 146         }
 147
 148         /*
 149          * Two address spaces supported: Memory or I/O. PCI_Config is
 150          * not supported here because the GAS structure is insufficient
 151          */
 152         if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
 153                 status = acpi_os_read_memory((acpi_physical_address)
 154                                              address, return_value,
 155                                              reg->bit_width);
 156                 if (ACPI_FAILURE(status)) {
 157                         return (status);
 158                 }
 159         } else {                /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */
 160
 161                 value_lo = 0;
 162                 value_hi = 0;
 163
 164                 width = reg->bit_width;
 165                 if (width == 64) {
 166                         width = 32;     /* Break into two 32-bit transfers */
 167                 }
 168
 169                 status = acpi_hw_read_port((acpi_io_address)
 170                                            address, &value_lo, width);
 171                 if (ACPI_FAILURE(status)) {
 172                         return (status);
 173                 }
 174
 175                 if (reg->bit_width == 64) {
 176
 177                         /* Read the top 32 bits */
 178
 179                         status = acpi_hw_read_port((acpi_io_address)
 180                                                    (address + 4), &value_hi,
 181                                                    32);
 182                         if (ACPI_FAILURE(status)) {
 183                                 return (status);
 184                         }
 185                 }
 186
 187                 /* Set the return value only if status is AE_OK */
 188
 189                 *return_value = (value_lo | ((u64)value_hi << 32));
 190         }
 191
 192         ACPI_DEBUG_PRINT((ACPI_DB_IO,
 193                           "Read:  %8.8X%8.8X width %2d from %8.8X%8.8X (%s)\n",
 194                           ACPI_FORMAT_UINT64(*return_value), reg->bit_width,
 195                           ACPI_FORMAT_UINT64(address),
 196                           acpi_ut_get_region_name(reg->space_id)));
 197
 198         return (AE_OK);
 199 }
 200
 201 ACPI_EXPORT_SYMBOL(acpi_read)
 202
 203 /******************************************************************************
 204  *
 205  * FUNCTION:    acpi_write
 206  *
 207  * PARAMETERS:  value               - Value to be written
 208  *              reg                 - GAS register structure
 209  *
 210  * RETURN:      Status
 211  *
 212  * DESCRIPTION: Write to either memory or IO space.
 213  *
 214  ******************************************************************************/
 215 acpi_status acpi_write(u64 value, struct acpi_generic_address *reg)
 216 {
 217         u32 width;
 218         u64 address;
 219         acpi_status status;
 220
 221         ACPI_FUNCTION_NAME(acpi_write);
 222
 223         /* Validate contents of the GAS register. Allow 64-bit transfers */
 224
 225         status = acpi_hw_validate_register(reg, 64, &address);
 226         if (ACPI_FAILURE(status)) {
 227                 return (status);
 228         }
 229
 230         /*
 231          * Two address spaces supported: Memory or IO. PCI_Config is
 232          * not supported here because the GAS structure is insufficient
 233          */
 234         if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
 235                 status = acpi_os_write_memory((acpi_physical_address)
 236                                               address, value, reg->bit_width);
 237                 if (ACPI_FAILURE(status)) {
 238                         return (status);
 239                 }
 240         } else {                /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */
 241
 242                 width = reg->bit_width;
 243                 if (width == 64) {
 244                         width = 32;     /* Break into two 32-bit transfers */
 245                 }
 246
 247                 status = acpi_hw_write_port((acpi_io_address)
 248                                             address, ACPI_LODWORD(value),
 249                                             width);
 250                 if (ACPI_FAILURE(status)) {
 251                         return (status);
 252                 }
 253
 254                 if (reg->bit_width == 64) {
 255                         status = acpi_hw_write_port((acpi_io_address)
 256                                                     (address + 4),
 257                                                     ACPI_HIDWORD(value), 32);
 258                         if (ACPI_FAILURE(status)) {
 259                                 return (status);
 260                         }
 261                 }
 262         }
 263
 264         ACPI_DEBUG_PRINT((ACPI_DB_IO,
 265                           "Wrote: %8.8X%8.8X width %2d   to %8.8X%8.8X (%s)\n",
 266                           ACPI_FORMAT_UINT64(value), reg->bit_width,
 267                           ACPI_FORMAT_UINT64(address),
 268                           acpi_ut_get_region_name(reg->space_id)));
 269
 270         return (status);
 271 }
 272
 273 ACPI_EXPORT_SYMBOL(acpi_write)
 274
 275 #if (!ACPI_REDUCED_HARDWARE)
 276 /*******************************************************************************
 277  *
 278  * FUNCTION:    acpi_read_bit_register
 279  *
 280  * PARAMETERS:  register_id     - ID of ACPI Bit Register to access
 281  *              return_value    - Value that was read from the register,
 282  *                                normalized to bit position zero.
 283  *
 284  * RETURN:      Status and the value read from the specified Register. Value
 285  *              returned is normalized to bit0 (is shifted all the way right)
 286  *
 287  * DESCRIPTION: ACPI bit_register read function. Does not acquire the HW lock.
 288  *
 289  * SUPPORTS:    Bit fields in PM1 Status, PM1 Enable, PM1 Control, and
 290  *              PM2 Control.
 291  *
 292  * Note: The hardware lock is not required when reading the ACPI bit registers
 293  *       since almost all of them are single bit and it does not matter that
 294  *       the parent hardware register can be split across two physical
 295  *       registers. The only multi-bit field is SLP_TYP in the PM1 control
 296  *       register, but this field does not cross an 8-bit boundary (nor does
 297  *       it make much sense to actually read this field.)
 298  *
 299  ******************************************************************************/
 300 acpi_status acpi_read_bit_register(u32 register_id, u32 *return_value)
 301 {
 302         struct acpi_bit_register_info *bit_reg_info;
 303         u32 register_value;
 304         u32 value;
 305         acpi_status status;
 306
 307         ACPI_FUNCTION_TRACE_U32(acpi_read_bit_register, register_id);
 308
 309         /* Get the info structure corresponding to the requested ACPI Register */
 310
 311         bit_reg_info = acpi_hw_get_bit_register_info(register_id);
 312         if (!bit_reg_info) {
 313                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 314         }
 315
 316         /* Read the entire parent register */
 317
 318         status = acpi_hw_register_read(bit_reg_info->parent_register,
 319                                        &register_value);
 320         if (ACPI_FAILURE(status)) {
 321                 return_ACPI_STATUS(status);
 322         }
 323
 324         /* Normalize the value that was read, mask off other bits */
 325
 326         value = ((register_value & bit_reg_info->access_bit_mask)
 327                  >> bit_reg_info->bit_position);
 328
 329         ACPI_DEBUG_PRINT((ACPI_DB_IO,
 330                           "BitReg %X, ParentReg %X, Actual %8.8X, ReturnValue %8.8X\n",
 331                           register_id, bit_reg_info->parent_register,
 332                           register_value, value));
 333
 334         *return_value = value;
 335         return_ACPI_STATUS(AE_OK);
 336 }
 337
 338 ACPI_EXPORT_SYMBOL(acpi_read_bit_register)
 339
 340 /*******************************************************************************
 341  *
 342  * FUNCTION:    acpi_write_bit_register
 343  *
 344  * PARAMETERS:  register_id     - ID of ACPI Bit Register to access
 345  *              value           - Value to write to the register, in bit
 346  *                                position zero. The bit is automatically
 347  *                                shifted to the correct position.
 348  *
 349  * RETURN:      Status
 350  *
 351  * DESCRIPTION: ACPI Bit Register write function. Acquires the hardware lock
 352  *              since most operations require a read/modify/write sequence.
 353  *
 354  * SUPPORTS:    Bit fields in PM1 Status, PM1 Enable, PM1 Control, and
 355  *              PM2 Control.
 356  *
 357  * Note that at this level, the fact that there may be actually two
 358  * hardware registers (A and B - and B may not exist) is abstracted.
 359  *
 360  ******************************************************************************/
 361 acpi_status acpi_write_bit_register(u32 register_id, u32 value)
 362 {
 363         struct acpi_bit_register_info *bit_reg_info;
 364         acpi_cpu_flags lock_flags;
 365         u32 register_value;
 366         acpi_status status = AE_OK;
 367
 368         ACPI_FUNCTION_TRACE_U32(acpi_write_bit_register, register_id);
 369
 370         /* Get the info structure corresponding to the requested ACPI Register */
 371
 372         bit_reg_info = acpi_hw_get_bit_register_info(register_id);
 373         if (!bit_reg_info) {
 374                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 375         }
 376
 377         lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
 378
 379         /*
 380          * At this point, we know that the parent register is one of the
 381          * following: PM1 Status, PM1 Enable, PM1 Control, or PM2 Control
 382          */
 383         if (bit_reg_info->parent_register != ACPI_REGISTER_PM1_STATUS) {
 384                 /*
 385                  * 1) Case for PM1 Enable, PM1 Control, and PM2 Control
 386                  *
 387                  * Perform a register read to preserve the bits that we are not
 388                  * interested in
 389                  */
 390                 status = acpi_hw_register_read(bit_reg_info->parent_register,
 391                                                &register_value);
 392                 if (ACPI_FAILURE(status)) {
 393                         goto unlock_and_exit;
 394                 }
 395
 396                 /*
 397                  * Insert the input bit into the value that was just read
 398                  * and write the register
 399                  */
 400                 ACPI_REGISTER_INSERT_VALUE(register_value,
 401                                            bit_reg_info->bit_position,
 402                                            bit_reg_info->access_bit_mask,
 403                                            value);
 404
 405                 status = acpi_hw_register_write(bit_reg_info->parent_register,
 406                                                 register_value);
 407         } else {
 408                 /*
 409                  * 2) Case for PM1 Status
 410                  *
 411                  * The Status register is different from the rest. Clear an event
 412                  * by writing 1, writing 0 has no effect. So, the only relevant
 413                  * information is the single bit we're interested in, all others
 414                  * should be written as 0 so they will be left unchanged.
 415                  */
 416                 register_value = ACPI_REGISTER_PREPARE_BITS(value,
 417                                                             bit_reg_info->
 418                                                             bit_position,
 419                                                             bit_reg_info->
 420                                                             access_bit_mask);
 421
 422                 /* No need to write the register if value is all zeros */
 423
 424                 if (register_value) {
 425                         status =
 426                             acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,
 427                                                    register_value);
 428                 }
 429         }
 430
 431         ACPI_DEBUG_PRINT((ACPI_DB_IO,
 432                           "BitReg %X, ParentReg %X, Value %8.8X, Actual %8.8X\n",
 433                           register_id, bit_reg_info->parent_register, value,
 434                           register_value));
 435
 436 unlock_and_exit:
 437
 438         acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
 439         return_ACPI_STATUS(status);
 440 }
 441
 442 ACPI_EXPORT_SYMBOL(acpi_write_bit_register)
 443 #endif                          /* !ACPI_REDUCED_HARDWARE */
 444 /*******************************************************************************
 445  *
 446  * FUNCTION:    acpi_get_sleep_type_data
 447  *
 448  * PARAMETERS:  sleep_state         - Numeric sleep state
 449  *              *sleep_type_a        - Where SLP_TYPa is returned
 450  *              *sleep_type_b        - Where SLP_TYPb is returned
 451  *
 452  * RETURN:      Status
 453  *
 454  * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested
 455  *              sleep state via the appropriate \_Sx object.
 456  *
 457  *  The sleep state package returned from the corresponding \_Sx_ object
 458  *  must contain at least one integer.
 459  *
 460  *  March 2005:
 461  *  Added support for a package that contains two integers. This
 462  *  goes against the ACPI specification which defines this object as a
 463  *  package with one encoded DWORD integer. However, existing practice
 464  *  by many BIOS vendors is to return a package with 2 or more integer
 465  *  elements, at least one per sleep type (A/B).
 466  *
 467  *  January 2013:
 468  *  Therefore, we must be prepared to accept a package with either a
 469  *  single integer or multiple integers.
 470  *
 471  *  The single integer DWORD format is as follows:
 472  *      BYTE 0 - Value for the PM1A SLP_TYP register
 473  *      BYTE 1 - Value for the PM1B SLP_TYP register
 474  *      BYTE 2-3 - Reserved
 475  *
 476  *  The dual integer format is as follows:
 477  *      Integer 0 - Value for the PM1A SLP_TYP register
 478  *      Integer 1 - Value for the PM1A SLP_TYP register
 479  *
 480  ******************************************************************************/
 481 acpi_status
 482 acpi_get_sleep_type_data(u8 sleep_state, u8 *sleep_type_a, u8 *sleep_type_b)
 483 {
 484         acpi_status status;
 485         struct acpi_evaluate_info *info;
 486         union acpi_operand_object **elements;
 487
 488         ACPI_FUNCTION_TRACE(acpi_get_sleep_type_data);
 489
 490         /* Validate parameters */
 491
 492         if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) {
 493                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 494         }
 495
 496         /* Allocate the evaluation information block */
 497
 498         info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 499         if (!info) {
 500                 return_ACPI_STATUS(AE_NO_MEMORY);
 501         }
 502
 503         /*
 504          * Evaluate the \_Sx namespace object containing the register values
 505          * for this state
 506          */
 507         info->relative_pathname =
 508             ACPI_CAST_PTR(char, acpi_gbl_sleep_state_names[sleep_state]);
 509         status = acpi_ns_evaluate(info);
 510         if (ACPI_FAILURE(status)) {
 511                 goto cleanup;
 512         }
 513
 514         /* Must have a return object */
 515
 516         if (!info->return_object) {
 517                 ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]",
 518                             info->relative_pathname));
 519                 status = AE_AML_NO_RETURN_VALUE;
 520                 goto cleanup;
 521         }
 522
 523         /* Return object must be of type Package */
 524
 525         if (info->return_object->common.type != ACPI_TYPE_PACKAGE) {
 526                 ACPI_ERROR((AE_INFO,
 527                             "Sleep State return object is not a Package"));
 528                 status = AE_AML_OPERAND_TYPE;
 529                 goto cleanup1;
 530         }
 531
 532         /*
 533          * Any warnings about the package length or the object types have
 534          * already been issued by the predefined name module -- there is no
 535          * need to repeat them here.
 536          */
 537         elements = info->return_object->package.elements;
 538         switch (info->return_object->package.count) {
 539         case 0:
 540
 541                 status = AE_AML_PACKAGE_LIMIT;
 542                 break;
 543
 544         case 1:
 545
 546                 if (elements[0]->common.type != ACPI_TYPE_INTEGER) {
 547                         status = AE_AML_OPERAND_TYPE;
 548                         break;
 549                 }
 550
 551                 /* A valid _Sx_ package with one integer */
 552
 553                 *sleep_type_a = (u8)elements[0]->integer.value;
 554                 *sleep_type_b = (u8)(elements[0]->integer.value >> 8);
 555                 break;
 556
 557         case 2:
 558         default:
 559
 560                 if ((elements[0]->common.type != ACPI_TYPE_INTEGER) ||
 561                     (elements[1]->common.type != ACPI_TYPE_INTEGER)) {
 562                         status = AE_AML_OPERAND_TYPE;
 563                         break;
 564                 }
 565
 566                 /* A valid _Sx_ package with two integers */
 567
 568                 *sleep_type_a = (u8)elements[0]->integer.value;
 569                 *sleep_type_b = (u8)elements[1]->integer.value;
 570                 break;
 571         }
 572
 573 cleanup1:
 574         acpi_ut_remove_reference(info->return_object);
 575
 576 cleanup:
 577         if (ACPI_FAILURE(status)) {
 578                 ACPI_EXCEPTION((AE_INFO, status,
 579                                 "While evaluating Sleep State [%s]",
 580                                 info->relative_pathname));
 581         }
 582
 583         ACPI_FREE(info);
 584         return_ACPI_STATUS(status);
 585 }
 586
 587 ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data)