LXR linux/drivers/acpi/acpica/exregion.c

   1
   2/******************************************************************************
   3 *
   4 * Module Name: exregion - ACPI default op_region (address space) handlers
   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 "acinterp.h"
  48
  49#define _COMPONENT          ACPI_EXECUTER
  50ACPI_MODULE_NAME("exregion")
  51
  52/*******************************************************************************
  53 *
  54 * FUNCTION:    acpi_ex_system_memory_space_handler
  55 *
  56 * PARAMETERS:  Function            - Read or Write operation
  57 *              Address             - Where in the space to read or write
  58 *              bit_width           - Field width in bits (8, 16, or 32)
  59 *              Value               - Pointer to in or out value
  60 *              handler_context     - Pointer to Handler's context
  61 *              region_context      - Pointer to context specific to the
  62 *                                    accessed region
  63 *
  64 * RETURN:      Status
  65 *
  66 * DESCRIPTION: Handler for the System Memory address space (Op Region)
  67 *
  68 ******************************************************************************/
  69acpi_status
  70acpi_ex_system_memory_space_handler(u32 function,
  71                                    acpi_physical_address address,
  72                                    u32 bit_width,
  73                                    acpi_integer * value,
  74                                    void *handler_context, void *region_context)
  75{
  76        acpi_status status = AE_OK;
  77        void *logical_addr_ptr = NULL;
  78        struct acpi_mem_space_context *mem_info = region_context;
  79        u32 length;
  80        acpi_size map_length;
  81        acpi_size page_boundary_map_length;
  82#ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
  83        u32 remainder;
  84#endif
  85
  86        ACPI_FUNCTION_TRACE(ex_system_memory_space_handler);
  87
  88        /* Validate and translate the bit width */
  89
  90        switch (bit_width) {
  91        case 8:
  92                length = 1;
  93                break;
  94
  95        case 16:
  96                length = 2;
  97                break;
  98
  99        case 32:
 100                length = 4;
 101                break;
 102
 103        case 64:
 104                length = 8;
 105                break;
 106
 107        default:
 108                ACPI_ERROR((AE_INFO, "Invalid SystemMemory width %d",
 109                            bit_width));
 110                return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 111        }
 112
 113#ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
 114        /*
 115         * Hardware does not support non-aligned data transfers, we must verify
 116         * the request.
 117         */
 118        (void)acpi_ut_short_divide((acpi_integer) address, length, NULL,
 119                                   &remainder);
 120        if (remainder != 0) {
 121                return_ACPI_STATUS(AE_AML_ALIGNMENT);
 122        }
 123#endif
 124
 125        /*
 126         * Does the request fit into the cached memory mapping?
 127         * Is 1) Address below the current mapping? OR
 128         *    2) Address beyond the current mapping?
 129         */
 130        if ((address < mem_info->mapped_physical_address) ||
 131            (((acpi_integer) address + length) > ((acpi_integer)
 132                                                  mem_info->
 133                                                  mapped_physical_address +
 134                                                  mem_info->mapped_length))) {
 135                /*
 136                 * The request cannot be resolved by the current memory mapping;
 137                 * Delete the existing mapping and create a new one.
 138                 */
 139                if (mem_info->mapped_length) {
 140
 141                        /* Valid mapping, delete it */
 142
 143                        acpi_os_unmap_memory(mem_info->mapped_logical_address,
 144                                             mem_info->mapped_length);
 145                }
 146
 147                /*
 148                 * Attempt to map from the requested address to the end of the region.
 149                 * However, we will never map more than one page, nor will we cross
 150                 * a page boundary.
 151                 */
 152                map_length = (acpi_size)
 153                    ((mem_info->address + mem_info->length) - address);
 154
 155                /*
 156                 * If mapping the entire remaining portion of the region will cross
 157                 * a page boundary, just map up to the page boundary, do not cross.
 158                 * On some systems, crossing a page boundary while mapping regions
 159                 * can cause warnings if the pages have different attributes
 160                 * due to resource management
 161                 */
 162                page_boundary_map_length =
 163                    ACPI_ROUND_UP(address, ACPI_DEFAULT_PAGE_SIZE) - address;
 164
 165                if (!page_boundary_map_length) {
 166                        page_boundary_map_length = ACPI_DEFAULT_PAGE_SIZE;
 167                }
 168
 169                if (map_length > page_boundary_map_length) {
 170                        map_length = page_boundary_map_length;
 171                }
 172
 173                /* Create a new mapping starting at the address given */
 174
 175                mem_info->mapped_logical_address = acpi_os_map_memory((acpi_physical_address) address, map_length);
 176                if (!mem_info->mapped_logical_address) {
 177                        ACPI_ERROR((AE_INFO,
 178                                    "Could not map memory at %8.8X%8.8X, size %X",
 179                                    ACPI_FORMAT_NATIVE_UINT(address),
 180                                    (u32) map_length));
 181                        mem_info->mapped_length = 0;
 182                        return_ACPI_STATUS(AE_NO_MEMORY);
 183                }
 184
 185                /* Save the physical address and mapping size */
 186
 187                mem_info->mapped_physical_address = address;
 188                mem_info->mapped_length = map_length;
 189        }
 190
 191        /*
 192         * Generate a logical pointer corresponding to the address we want to
 193         * access
 194         */
 195        logical_addr_ptr = mem_info->mapped_logical_address +
 196            ((acpi_integer) address -
 197             (acpi_integer) mem_info->mapped_physical_address);
 198
 199        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 200                          "System-Memory (width %d) R/W %d Address=%8.8X%8.8X\n",
 201                          bit_width, function,
 202                          ACPI_FORMAT_NATIVE_UINT(address)));
 203
 204        /*
 205         * Perform the memory read or write
 206         *
 207         * Note: For machines that do not support non-aligned transfers, the target
 208         * address was checked for alignment above.  We do not attempt to break the
 209         * transfer up into smaller (byte-size) chunks because the AML specifically
 210         * asked for a transfer width that the hardware may require.
 211         */
 212        switch (function) {
 213        case ACPI_READ:
 214
 215                *value = 0;
 216                switch (bit_width) {
 217                case 8:
 218                        *value = (acpi_integer) ACPI_GET8(logical_addr_ptr);
 219                        break;
 220
 221                case 16:
 222                        *value = (acpi_integer) ACPI_GET16(logical_addr_ptr);
 223                        break;
 224
 225                case 32:
 226                        *value = (acpi_integer) ACPI_GET32(logical_addr_ptr);
 227                        break;
 228
 229                case 64:
 230                        *value = (acpi_integer) ACPI_GET64(logical_addr_ptr);
 231                        break;
 232
 233                default:
 234                        /* bit_width was already validated */
 235                        break;
 236                }
 237                break;
 238
 239        case ACPI_WRITE:
 240
 241                switch (bit_width) {
 242                case 8:
 243                        ACPI_SET8(logical_addr_ptr) = (u8) * value;
 244                        break;
 245
 246                case 16:
 247                        ACPI_SET16(logical_addr_ptr) = (u16) * value;
 248                        break;
 249
 250                case 32:
 251                        ACPI_SET32(logical_addr_ptr) = (u32) * value;
 252                        break;
 253
 254                case 64:
 255                        ACPI_SET64(logical_addr_ptr) = (u64) * value;
 256                        break;
 257
 258                default:
 259                        /* bit_width was already validated */
 260                        break;
 261                }
 262                break;
 263
 264        default:
 265                status = AE_BAD_PARAMETER;
 266                break;
 267        }
 268
 269        return_ACPI_STATUS(status);
 270}
 271
 272/*******************************************************************************
 273 *
 274 * FUNCTION:    acpi_ex_system_io_space_handler
 275 *
 276 * PARAMETERS:  Function            - Read or Write operation
 277 *              Address             - Where in the space to read or write
 278 *              bit_width           - Field width in bits (8, 16, or 32)
 279 *              Value               - Pointer to in or out value
 280 *              handler_context     - Pointer to Handler's context
 281 *              region_context      - Pointer to context specific to the
 282 *                                    accessed region
 283 *
 284 * RETURN:      Status
 285 *
 286 * DESCRIPTION: Handler for the System IO address space (Op Region)
 287 *
 288 ******************************************************************************/
 289
 290acpi_status
 291acpi_ex_system_io_space_handler(u32 function,
 292                                acpi_physical_address address,
 293                                u32 bit_width,
 294                                acpi_integer * value,
 295                                void *handler_context, void *region_context)
 296{
 297        acpi_status status = AE_OK;
 298        u32 value32;
 299
 300        ACPI_FUNCTION_TRACE(ex_system_io_space_handler);
 301
 302        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 303                          "System-IO (width %d) R/W %d Address=%8.8X%8.8X\n",
 304                          bit_width, function,
 305                          ACPI_FORMAT_NATIVE_UINT(address)));
 306
 307        /* Decode the function parameter */
 308
 309        switch (function) {
 310        case ACPI_READ:
 311
 312                status = acpi_hw_read_port((acpi_io_address) address,
 313                                           &value32, bit_width);
 314                *value = value32;
 315                break;
 316
 317        case ACPI_WRITE:
 318
 319                status = acpi_hw_write_port((acpi_io_address) address,
 320                                            (u32) * value, bit_width);
 321                break;
 322
 323        default:
 324                status = AE_BAD_PARAMETER;
 325                break;
 326        }
 327
 328        return_ACPI_STATUS(status);
 329}
 330
 331/*******************************************************************************
 332 *
 333 * FUNCTION:    acpi_ex_pci_config_space_handler
 334 *
 335 * PARAMETERS:  Function            - Read or Write operation
 336 *              Address             - Where in the space to read or write
 337 *              bit_width           - Field width in bits (8, 16, or 32)
 338 *              Value               - Pointer to in or out value
 339 *              handler_context     - Pointer to Handler's context
 340 *              region_context      - Pointer to context specific to the
 341 *                                    accessed region
 342 *
 343 * RETURN:      Status
 344 *
 345 * DESCRIPTION: Handler for the PCI Config address space (Op Region)
 346 *
 347 ******************************************************************************/
 348
 349acpi_status
 350acpi_ex_pci_config_space_handler(u32 function,
 351                                 acpi_physical_address address,
 352                                 u32 bit_width,
 353                                 acpi_integer * value,
 354                                 void *handler_context, void *region_context)
 355{
 356        acpi_status status = AE_OK;
 357        struct acpi_pci_id *pci_id;
 358        u16 pci_register;
 359        u32 value32;
 360
 361        ACPI_FUNCTION_TRACE(ex_pci_config_space_handler);
 362
 363        /*
 364         *  The arguments to acpi_os(Read|Write)pci_configuration are:
 365         *
 366         *  pci_segment is the PCI bus segment range 0-31
 367         *  pci_bus     is the PCI bus number range 0-255
 368         *  pci_device  is the PCI device number range 0-31
 369         *  pci_function is the PCI device function number
 370         *  pci_register is the Config space register range 0-255 bytes
 371         *
 372         *  Value - input value for write, output address for read
 373         *
 374         */
 375        pci_id = (struct acpi_pci_id *)region_context;
 376        pci_register = (u16) (u32) address;
 377
 378        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 379                          "Pci-Config %d (%d) Seg(%04x) Bus(%04x) Dev(%04x) Func(%04x) Reg(%04x)\n",
 380                          function, bit_width, pci_id->segment, pci_id->bus,
 381                          pci_id->device, pci_id->function, pci_register));
 382
 383        switch (function) {
 384        case ACPI_READ:
 385
 386                status = acpi_os_read_pci_configuration(pci_id, pci_register,
 387                                                        &value32, bit_width);
 388                *value = value32;
 389                break;
 390
 391        case ACPI_WRITE:
 392
 393                status = acpi_os_write_pci_configuration(pci_id, pci_register,
 394                                                         *value, bit_width);
 395                break;
 396
 397        default:
 398
 399                status = AE_BAD_PARAMETER;
 400                break;
 401        }
 402
 403        return_ACPI_STATUS(status);
 404}
 405
 406/*******************************************************************************
 407 *
 408 * FUNCTION:    acpi_ex_cmos_space_handler
 409 *
 410 * PARAMETERS:  Function            - Read or Write operation
 411 *              Address             - Where in the space to read or write
 412 *              bit_width           - Field width in bits (8, 16, or 32)
 413 *              Value               - Pointer to in or out value
 414 *              handler_context     - Pointer to Handler's context
 415 *              region_context      - Pointer to context specific to the
 416 *                                    accessed region
 417 *
 418 * RETURN:      Status
 419 *
 420 * DESCRIPTION: Handler for the CMOS address space (Op Region)
 421 *
 422 ******************************************************************************/
 423
 424acpi_status
 425acpi_ex_cmos_space_handler(u32 function,
 426                           acpi_physical_address address,
 427                           u32 bit_width,
 428                           acpi_integer * value,
 429                           void *handler_context, void *region_context)
 430{
 431        acpi_status status = AE_OK;
 432
 433        ACPI_FUNCTION_TRACE(ex_cmos_space_handler);
 434
 435        return_ACPI_STATUS(status);
 436}
 437
 438/*******************************************************************************
 439 *
 440 * FUNCTION:    acpi_ex_pci_bar_space_handler
 441 *
 442 * PARAMETERS:  Function            - Read or Write operation
 443 *              Address             - Where in the space to read or write
 444 *              bit_width           - Field width in bits (8, 16, or 32)
 445 *              Value               - Pointer to in or out value
 446 *              handler_context     - Pointer to Handler's context
 447 *              region_context      - Pointer to context specific to the
 448 *                                    accessed region
 449 *
 450 * RETURN:      Status
 451 *
 452 * DESCRIPTION: Handler for the PCI bar_target address space (Op Region)
 453 *
 454 ******************************************************************************/
 455
 456acpi_status
 457acpi_ex_pci_bar_space_handler(u32 function,
 458                              acpi_physical_address address,
 459                              u32 bit_width,
 460                              acpi_integer * value,
 461                              void *handler_context, void *region_context)
 462{
 463        acpi_status status = AE_OK;
 464
 465        ACPI_FUNCTION_TRACE(ex_pci_bar_space_handler);
 466
 467        return_ACPI_STATUS(status);
 468}
 469
 470/*******************************************************************************
 471 *
 472 * FUNCTION:    acpi_ex_data_table_space_handler
 473 *
 474 * PARAMETERS:  Function            - Read or Write operation
 475 *              Address             - Where in the space to read or write
 476 *              bit_width           - Field width in bits (8, 16, or 32)
 477 *              Value               - Pointer to in or out value
 478 *              handler_context     - Pointer to Handler's context
 479 *              region_context      - Pointer to context specific to the
 480 *                                    accessed region
 481 *
 482 * RETURN:      Status
 483 *
 484 * DESCRIPTION: Handler for the Data Table address space (Op Region)
 485 *
 486 ******************************************************************************/
 487
 488acpi_status
 489acpi_ex_data_table_space_handler(u32 function,
 490                                 acpi_physical_address address,
 491                                 u32 bit_width,
 492                                 acpi_integer * value,
 493                                 void *handler_context, void *region_context)
 494{
 495        ACPI_FUNCTION_TRACE(ex_data_table_space_handler);
 496
 497        /* Perform the memory read or write */
 498
 499        switch (function) {
 500        case ACPI_READ:
 501
 502                ACPI_MEMCPY(ACPI_CAST_PTR(char, value),
 503                            ACPI_PHYSADDR_TO_PTR(address),
 504                            ACPI_DIV_8(bit_width));
 505                break;
 506
 507        case ACPI_WRITE:
 508        default:
 509
 510                return_ACPI_STATUS(AE_SUPPORT);
 511        }
 512
 513        return_ACPI_STATUS(AE_OK);
 514}
 515