LXR linux/drivers/acpi/executer/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 <acpi/acinterp.h>
  47
  48#define _COMPONENT          ACPI_EXECUTER
  49ACPI_MODULE_NAME("exregion")
  50
  51/*******************************************************************************
  52 *
  53 * FUNCTION:    acpi_ex_system_memory_space_handler
  54 *
  55 * PARAMETERS:  Function            - Read or Write operation
  56 *              Address             - Where in the space to read or write
  57 *              bit_width           - Field width in bits (8, 16, or 32)
  58 *              Value               - Pointer to in or out value
  59 *              handler_context     - Pointer to Handler's context
  60 *              region_context      - Pointer to context specific to the
  61 *                                    accessed region
  62 *
  63 * RETURN:      Status
  64 *
  65 * DESCRIPTION: Handler for the System Memory address space (Op Region)
  66 *
  67 ******************************************************************************/
  68acpi_status
  69acpi_ex_system_memory_space_handler(u32 function,
  70                                    acpi_physical_address address,
  71                                    u32 bit_width,
  72                                    acpi_integer * value,
  73                                    void *handler_context, void *region_context)
  74{
  75        acpi_status status = AE_OK;
  76        void *logical_addr_ptr = NULL;
  77        struct acpi_mem_space_context *mem_info = region_context;
  78        u32 length;
  79        acpi_size window_size;
  80#ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
  81        u32 remainder;
  82#endif
  83
  84        ACPI_FUNCTION_TRACE(ex_system_memory_space_handler);
  85
  86        /* Validate and translate the bit width */
  87
  88        switch (bit_width) {
  89        case 8:
  90                length = 1;
  91                break;
  92
  93        case 16:
  94                length = 2;
  95                break;
  96
  97        case 32:
  98                length = 4;
  99                break;
 100
 101        case 64:
 102                length = 8;
 103                break;
 104
 105        default:
 106                ACPI_ERROR((AE_INFO, "Invalid SystemMemory width %d",
 107                            bit_width));
 108                return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 109        }
 110
 111#ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
 112        /*
 113         * Hardware does not support non-aligned data transfers, we must verify
 114         * the request.
 115         */
 116        (void)acpi_ut_short_divide((acpi_integer) address, length, NULL,
 117                                   &remainder);
 118        if (remainder != 0) {
 119                return_ACPI_STATUS(AE_AML_ALIGNMENT);
 120        }
 121#endif
 122
 123        /*
 124         * Does the request fit into the cached memory mapping?
 125         * Is 1) Address below the current mapping? OR
 126         *    2) Address beyond the current mapping?
 127         */
 128        if ((address < mem_info->mapped_physical_address) ||
 129            (((acpi_integer) address + length) > ((acpi_integer)
 130                                                  mem_info->
 131                                                  mapped_physical_address +
 132                                                  mem_info->mapped_length))) {
 133                /*
 134                 * The request cannot be resolved by the current memory mapping;
 135                 * Delete the existing mapping and create a new one.
 136                 */
 137                if (mem_info->mapped_length) {
 138
 139                        /* Valid mapping, delete it */
 140
 141                        acpi_os_unmap_memory(mem_info->mapped_logical_address,
 142                                             mem_info->mapped_length);
 143                }
 144
 145                /*
 146                 * Don't attempt to map memory beyond the end of the region, and
 147                 * constrain the maximum mapping size to something reasonable.
 148                 */
 149                window_size = (acpi_size)
 150                    ((mem_info->address + mem_info->length) - address);
 151
 152                if (window_size > ACPI_SYSMEM_REGION_WINDOW_SIZE) {
 153                        window_size = ACPI_SYSMEM_REGION_WINDOW_SIZE;
 154                }
 155
 156                /* Create a new mapping starting at the address given */
 157
 158                mem_info->mapped_logical_address =
 159                        acpi_os_map_memory((acpi_physical_address) address, window_size);
 160                if (!mem_info->mapped_logical_address) {
 161                        ACPI_ERROR((AE_INFO,
 162                                    "Could not map memory at %8.8X%8.8X, size %X",
 163                                    ACPI_FORMAT_NATIVE_UINT(address),
 164                                    (u32) window_size));
 165                        mem_info->mapped_length = 0;
 166                        return_ACPI_STATUS(AE_NO_MEMORY);
 167                }
 168
 169                /* Save the physical address and mapping size */
 170
 171                mem_info->mapped_physical_address = address;
 172                mem_info->mapped_length = window_size;
 173        }
 174
 175        /*
 176         * Generate a logical pointer corresponding to the address we want to
 177         * access
 178         */
 179        logical_addr_ptr = mem_info->mapped_logical_address +
 180            ((acpi_integer) address -
 181             (acpi_integer) mem_info->mapped_physical_address);
 182
 183        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 184                          "System-Memory (width %d) R/W %d Address=%8.8X%8.8X\n",
 185                          bit_width, function,
 186                          ACPI_FORMAT_NATIVE_UINT(address)));
 187
 188        /*
 189         * Perform the memory read or write
 190         *
 191         * Note: For machines that do not support non-aligned transfers, the target
 192         * address was checked for alignment above.  We do not attempt to break the
 193         * transfer up into smaller (byte-size) chunks because the AML specifically
 194         * asked for a transfer width that the hardware may require.
 195         */
 196        switch (function) {
 197        case ACPI_READ:
 198
 199                *value = 0;
 200                switch (bit_width) {
 201                case 8:
 202                        *value = (acpi_integer) ACPI_GET8(logical_addr_ptr);
 203                        break;
 204
 205                case 16:
 206                        *value = (acpi_integer) ACPI_GET16(logical_addr_ptr);
 207                        break;
 208
 209                case 32:
 210                        *value = (acpi_integer) ACPI_GET32(logical_addr_ptr);
 211                        break;
 212
 213                case 64:
 214                        *value = (acpi_integer) ACPI_GET64(logical_addr_ptr);
 215                        break;
 216
 217                default:
 218                        /* bit_width was already validated */
 219                        break;
 220                }
 221                break;
 222
 223        case ACPI_WRITE:
 224
 225                switch (bit_width) {
 226                case 8:
 227                        ACPI_SET8(logical_addr_ptr) = (u8) * value;
 228                        break;
 229
 230                case 16:
 231                        ACPI_SET16(logical_addr_ptr) = (u16) * value;
 232                        break;
 233
 234                case 32:
 235                        ACPI_SET32(logical_addr_ptr) = (u32) * value;
 236                        break;
 237
 238                case 64:
 239                        ACPI_SET64(logical_addr_ptr) = (u64) * value;
 240                        break;
 241
 242                default:
 243                        /* bit_width was already validated */
 244                        break;
 245                }
 246                break;
 247
 248        default:
 249                status = AE_BAD_PARAMETER;
 250                break;
 251        }
 252
 253        return_ACPI_STATUS(status);
 254}
 255
 256/*******************************************************************************
 257 *
 258 * FUNCTION:    acpi_ex_system_io_space_handler
 259 *
 260 * PARAMETERS:  Function            - Read or Write operation
 261 *              Address             - Where in the space to read or write
 262 *              bit_width           - Field width in bits (8, 16, or 32)
 263 *              Value               - Pointer to in or out value
 264 *              handler_context     - Pointer to Handler's context
 265 *              region_context      - Pointer to context specific to the
 266 *                                    accessed region
 267 *
 268 * RETURN:      Status
 269 *
 270 * DESCRIPTION: Handler for the System IO address space (Op Region)
 271 *
 272 ******************************************************************************/
 273
 274acpi_status
 275acpi_ex_system_io_space_handler(u32 function,
 276                                acpi_physical_address address,
 277                                u32 bit_width,
 278                                acpi_integer * value,
 279                                void *handler_context, void *region_context)
 280{
 281        acpi_status status = AE_OK;
 282        u32 value32;
 283
 284        ACPI_FUNCTION_TRACE(ex_system_io_space_handler);
 285
 286        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 287                          "System-IO (width %d) R/W %d Address=%8.8X%8.8X\n",
 288                          bit_width, function,
 289                          ACPI_FORMAT_NATIVE_UINT(address)));
 290
 291        /* Decode the function parameter */
 292
 293        switch (function) {
 294        case ACPI_READ:
 295
 296                status = acpi_os_read_port((acpi_io_address) address,
 297                                           &value32, bit_width);
 298                *value = value32;
 299                break;
 300
 301        case ACPI_WRITE:
 302
 303                status = acpi_os_write_port((acpi_io_address) address,
 304                                            (u32) * value, bit_width);
 305                break;
 306
 307        default:
 308                status = AE_BAD_PARAMETER;
 309                break;
 310        }
 311
 312        return_ACPI_STATUS(status);
 313}
 314
 315/*******************************************************************************
 316 *
 317 * FUNCTION:    acpi_ex_pci_config_space_handler
 318 *
 319 * PARAMETERS:  Function            - Read or Write operation
 320 *              Address             - Where in the space to read or write
 321 *              bit_width           - Field width in bits (8, 16, or 32)
 322 *              Value               - Pointer to in or out value
 323 *              handler_context     - Pointer to Handler's context
 324 *              region_context      - Pointer to context specific to the
 325 *                                    accessed region
 326 *
 327 * RETURN:      Status
 328 *
 329 * DESCRIPTION: Handler for the PCI Config address space (Op Region)
 330 *
 331 ******************************************************************************/
 332
 333acpi_status
 334acpi_ex_pci_config_space_handler(u32 function,
 335                                 acpi_physical_address address,
 336                                 u32 bit_width,
 337                                 acpi_integer * value,
 338                                 void *handler_context, void *region_context)
 339{
 340        acpi_status status = AE_OK;
 341        struct acpi_pci_id *pci_id;
 342        u16 pci_register;
 343        u32 value32;
 344
 345        ACPI_FUNCTION_TRACE(ex_pci_config_space_handler);
 346
 347        /*
 348         *  The arguments to acpi_os(Read|Write)pci_configuration are:
 349         *
 350         *  pci_segment is the PCI bus segment range 0-31
 351         *  pci_bus     is the PCI bus number range 0-255
 352         *  pci_device  is the PCI device number range 0-31
 353         *  pci_function is the PCI device function number
 354         *  pci_register is the Config space register range 0-255 bytes
 355         *
 356         *  Value - input value for write, output address for read
 357         *
 358         */
 359        pci_id = (struct acpi_pci_id *)region_context;
 360        pci_register = (u16) (u32) address;
 361
 362        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 363                          "Pci-Config %d (%d) Seg(%04x) Bus(%04x) Dev(%04x) Func(%04x) Reg(%04x)\n",
 364                          function, bit_width, pci_id->segment, pci_id->bus,
 365                          pci_id->device, pci_id->function, pci_register));
 366
 367        switch (function) {
 368        case ACPI_READ:
 369
 370                status = acpi_os_read_pci_configuration(pci_id, pci_register,
 371                                                        &value32, bit_width);
 372                *value = value32;
 373                break;
 374
 375        case ACPI_WRITE:
 376
 377                status = acpi_os_write_pci_configuration(pci_id, pci_register,
 378                                                         *value, bit_width);
 379                break;
 380
 381        default:
 382
 383                status = AE_BAD_PARAMETER;
 384                break;
 385        }
 386
 387        return_ACPI_STATUS(status);
 388}
 389
 390/*******************************************************************************
 391 *
 392 * FUNCTION:    acpi_ex_cmos_space_handler
 393 *
 394 * PARAMETERS:  Function            - Read or Write operation
 395 *              Address             - Where in the space to read or write
 396 *              bit_width           - Field width in bits (8, 16, or 32)
 397 *              Value               - Pointer to in or out value
 398 *              handler_context     - Pointer to Handler's context
 399 *              region_context      - Pointer to context specific to the
 400 *                                    accessed region
 401 *
 402 * RETURN:      Status
 403 *
 404 * DESCRIPTION: Handler for the CMOS address space (Op Region)
 405 *
 406 ******************************************************************************/
 407
 408acpi_status
 409acpi_ex_cmos_space_handler(u32 function,
 410                           acpi_physical_address address,
 411                           u32 bit_width,
 412                           acpi_integer * value,
 413                           void *handler_context, void *region_context)
 414{
 415        acpi_status status = AE_OK;
 416
 417        ACPI_FUNCTION_TRACE(ex_cmos_space_handler);
 418
 419        return_ACPI_STATUS(status);
 420}
 421
 422/*******************************************************************************
 423 *
 424 * FUNCTION:    acpi_ex_pci_bar_space_handler
 425 *
 426 * PARAMETERS:  Function            - Read or Write operation
 427 *              Address             - Where in the space to read or write
 428 *              bit_width           - Field width in bits (8, 16, or 32)
 429 *              Value               - Pointer to in or out value
 430 *              handler_context     - Pointer to Handler's context
 431 *              region_context      - Pointer to context specific to the
 432 *                                    accessed region
 433 *
 434 * RETURN:      Status
 435 *
 436 * DESCRIPTION: Handler for the PCI bar_target address space (Op Region)
 437 *
 438 ******************************************************************************/
 439
 440acpi_status
 441acpi_ex_pci_bar_space_handler(u32 function,
 442                              acpi_physical_address address,
 443                              u32 bit_width,
 444                              acpi_integer * value,
 445                              void *handler_context, void *region_context)
 446{
 447        acpi_status status = AE_OK;
 448
 449        ACPI_FUNCTION_TRACE(ex_pci_bar_space_handler);
 450
 451        return_ACPI_STATUS(status);
 452}
 453
 454/*******************************************************************************
 455 *
 456 * FUNCTION:    acpi_ex_data_table_space_handler
 457 *
 458 * PARAMETERS:  Function            - Read or Write operation
 459 *              Address             - Where in the space to read or write
 460 *              bit_width           - Field width in bits (8, 16, or 32)
 461 *              Value               - Pointer to in or out value
 462 *              handler_context     - Pointer to Handler's context
 463 *              region_context      - Pointer to context specific to the
 464 *                                    accessed region
 465 *
 466 * RETURN:      Status
 467 *
 468 * DESCRIPTION: Handler for the Data Table address space (Op Region)
 469 *
 470 ******************************************************************************/
 471
 472acpi_status
 473acpi_ex_data_table_space_handler(u32 function,
 474                                 acpi_physical_address address,
 475                                 u32 bit_width,
 476                                 acpi_integer * value,
 477                                 void *handler_context, void *region_context)
 478{
 479        ACPI_FUNCTION_TRACE(ex_data_table_space_handler);
 480
 481        /* Perform the memory read or write */
 482
 483        switch (function) {
 484        case ACPI_READ:
 485
 486                ACPI_MEMCPY(ACPI_CAST_PTR(char, value),
 487                            ACPI_PHYSADDR_TO_PTR(address),
 488                            ACPI_DIV_8(bit_width));
 489                break;
 490
 491        case ACPI_WRITE:
 492        default:
 493
 494                return_ACPI_STATUS(AE_SUPPORT);
 495        }
 496
 497        return_ACPI_STATUS(AE_OK);
 498}
 499