release/src-rt-6.x.4708/linux/linux-2.6.36/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 - 2010, 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
  50 ACPI_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  ******************************************************************************/
  69 acpi_status
  70 acpi_ex_system_memory_space_handler(u32 function,
  71                                     acpi_physical_address address,
  72                                     u32 bit_width,
  73                                     u64 *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 %u",
 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((u64) address, length, NULL, &remainder);
 119         if (remainder != 0) {
 120                 return_ACPI_STATUS(AE_AML_ALIGNMENT);
 121         }
 122 #endif
 123
 124         /*
 125          * Does the request fit into the cached memory mapping?
 126          * Is 1) Address below the current mapping? OR
 127          *    2) Address beyond the current mapping?
 128          */
 129         if ((address < mem_info->mapped_physical_address) ||
 130             (((u64) address + length) > ((u64)
 131                                          mem_info->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                  * Attempt to map from the requested address to the end of the region.
 147                  * However, we will never map more than one page, nor will we cross
 148                  * a page boundary.
 149                  */
 150                 map_length = (acpi_size)
 151                     ((mem_info->address + mem_info->length) - address);
 152
 153                 /*
 154                  * If mapping the entire remaining portion of the region will cross
 155                  * a page boundary, just map up to the page boundary, do not cross.
 156                  * On some systems, crossing a page boundary while mapping regions
 157                  * can cause warnings if the pages have different attributes
 158                  * due to resource management
 159                  */
 160                 page_boundary_map_length =
 161                     ACPI_ROUND_UP(address, ACPI_DEFAULT_PAGE_SIZE) - address;
 162
 163                 if (!page_boundary_map_length) {
 164                         page_boundary_map_length = ACPI_DEFAULT_PAGE_SIZE;
 165                 }
 166
 167                 if (map_length > page_boundary_map_length) {
 168                         map_length = page_boundary_map_length;
 169                 }
 170
 171                 /* Create a new mapping starting at the address given */
 172
 173                 mem_info->mapped_logical_address = acpi_os_map_memory((acpi_physical_address) address, map_length);
 174                 if (!mem_info->mapped_logical_address) {
 175                         ACPI_ERROR((AE_INFO,
 176                                     "Could not map memory at 0x%8.8X%8.8X, size %u",
 177                                     ACPI_FORMAT_NATIVE_UINT(address),
 178                                     (u32) map_length));
 179                         mem_info->mapped_length = 0;
 180                         return_ACPI_STATUS(AE_NO_MEMORY);
 181                 }
 182
 183                 /* Save the physical address and mapping size */
 184
 185                 mem_info->mapped_physical_address = address;
 186                 mem_info->mapped_length = map_length;
 187         }
 188
 189         /*
 190          * Generate a logical pointer corresponding to the address we want to
 191          * access
 192          */
 193         logical_addr_ptr = mem_info->mapped_logical_address +
 194             ((u64) address - (u64) mem_info->mapped_physical_address);
 195
 196         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 197                           "System-Memory (width %u) R/W %u Address=%8.8X%8.8X\n",
 198                           bit_width, function,
 199                           ACPI_FORMAT_NATIVE_UINT(address)));
 200
 201         /*
 202          * Perform the memory read or write
 203          *
 204          * Note: For machines that do not support non-aligned transfers, the target
 205          * address was checked for alignment above.  We do not attempt to break the
 206          * transfer up into smaller (byte-size) chunks because the AML specifically
 207          * asked for a transfer width that the hardware may require.
 208          */
 209         switch (function) {
 210         case ACPI_READ:
 211
 212                 *value = 0;
 213                 switch (bit_width) {
 214                 case 8:
 215                         *value = (u64) ACPI_GET8(logical_addr_ptr);
 216                         break;
 217
 218                 case 16:
 219                         *value = (u64) ACPI_GET16(logical_addr_ptr);
 220                         break;
 221
 222                 case 32:
 223                         *value = (u64) ACPI_GET32(logical_addr_ptr);
 224                         break;
 225
 226                 case 64:
 227                         *value = (u64) ACPI_GET64(logical_addr_ptr);
 228                         break;
 229
 230                 default:
 231                         /* bit_width was already validated */
 232                         break;
 233                 }
 234                 break;
 235
 236         case ACPI_WRITE:
 237
 238                 switch (bit_width) {
 239                 case 8:
 240                         ACPI_SET8(logical_addr_ptr) = (u8) * value;
 241                         break;
 242
 243                 case 16:
 244                         ACPI_SET16(logical_addr_ptr) = (u16) * value;
 245                         break;
 246
 247                 case 32:
 248                         ACPI_SET32(logical_addr_ptr) = (u32) * value;
 249                         break;
 250
 251                 case 64:
 252                         ACPI_SET64(logical_addr_ptr) = (u64) * value;
 253                         break;
 254
 255                 default:
 256                         /* bit_width was already validated */
 257                         break;
 258                 }
 259                 break;
 260
 261         default:
 262                 status = AE_BAD_PARAMETER;
 263                 break;
 264         }
 265
 266         return_ACPI_STATUS(status);
 267 }
 268
 269 /*******************************************************************************
 270  *
 271  * FUNCTION:    acpi_ex_system_io_space_handler
 272  *
 273  * PARAMETERS:  Function            - Read or Write operation
 274  *              Address             - Where in the space to read or write
 275  *              bit_width           - Field width in bits (8, 16, or 32)
 276  *              Value               - Pointer to in or out value
 277  *              handler_context     - Pointer to Handler's context
 278  *              region_context      - Pointer to context specific to the
 279  *                                    accessed region
 280  *
 281  * RETURN:      Status
 282  *
 283  * DESCRIPTION: Handler for the System IO address space (Op Region)
 284  *
 285  ******************************************************************************/
 286
 287 acpi_status
 288 acpi_ex_system_io_space_handler(u32 function,
 289                                 acpi_physical_address address,
 290                                 u32 bit_width,
 291                                 u64 *value,
 292                                 void *handler_context, void *region_context)
 293 {
 294         acpi_status status = AE_OK;
 295         u32 value32;
 296
 297         ACPI_FUNCTION_TRACE(ex_system_io_space_handler);
 298
 299         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 300                           "System-IO (width %u) R/W %u Address=%8.8X%8.8X\n",
 301                           bit_width, function,
 302                           ACPI_FORMAT_NATIVE_UINT(address)));
 303
 304         /* Decode the function parameter */
 305
 306         switch (function) {
 307         case ACPI_READ:
 308
 309                 status = acpi_hw_read_port((acpi_io_address) address,
 310                                            &value32, bit_width);
 311                 *value = value32;
 312                 break;
 313
 314         case ACPI_WRITE:
 315
 316                 status = acpi_hw_write_port((acpi_io_address) address,
 317                                             (u32) * value, bit_width);
 318                 break;
 319
 320         default:
 321                 status = AE_BAD_PARAMETER;
 322                 break;
 323         }
 324
 325         return_ACPI_STATUS(status);
 326 }
 327
 328 /*******************************************************************************
 329  *
 330  * FUNCTION:    acpi_ex_pci_config_space_handler
 331  *
 332  * PARAMETERS:  Function            - Read or Write operation
 333  *              Address             - Where in the space to read or write
 334  *              bit_width           - Field width in bits (8, 16, or 32)
 335  *              Value               - Pointer to in or out value
 336  *              handler_context     - Pointer to Handler's context
 337  *              region_context      - Pointer to context specific to the
 338  *                                    accessed region
 339  *
 340  * RETURN:      Status
 341  *
 342  * DESCRIPTION: Handler for the PCI Config address space (Op Region)
 343  *
 344  ******************************************************************************/
 345
 346 acpi_status
 347 acpi_ex_pci_config_space_handler(u32 function,
 348                                  acpi_physical_address address,
 349                                  u32 bit_width,
 350                                  u64 *value,
 351                                  void *handler_context, void *region_context)
 352 {
 353         acpi_status status = AE_OK;
 354         struct acpi_pci_id *pci_id;
 355         u16 pci_register;
 356         u32 value32;
 357
 358         ACPI_FUNCTION_TRACE(ex_pci_config_space_handler);
 359
 360         /*
 361          *  The arguments to acpi_os(Read|Write)pci_configuration are:
 362          *
 363          *  pci_segment is the PCI bus segment range 0-31
 364          *  pci_bus     is the PCI bus number range 0-255
 365          *  pci_device  is the PCI device number range 0-31
 366          *  pci_function is the PCI device function number
 367          *  pci_register is the Config space register range 0-255 bytes
 368          *
 369          *  Value - input value for write, output address for read
 370          *
 371          */
 372         pci_id = (struct acpi_pci_id *)region_context;
 373         pci_register = (u16) (u32) address;
 374
 375         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 376                           "Pci-Config %u (%u) Seg(%04x) Bus(%04x) Dev(%04x) Func(%04x) Reg(%04x)\n",
 377                           function, bit_width, pci_id->segment, pci_id->bus,
 378                           pci_id->device, pci_id->function, pci_register));
 379
 380         switch (function) {
 381         case ACPI_READ:
 382
 383                 status = acpi_os_read_pci_configuration(pci_id, pci_register,
 384                                                         &value32, bit_width);
 385                 *value = value32;
 386                 break;
 387
 388         case ACPI_WRITE:
 389
 390                 status = acpi_os_write_pci_configuration(pci_id, pci_register,
 391                                                          *value, bit_width);
 392                 break;
 393
 394         default:
 395
 396                 status = AE_BAD_PARAMETER;
 397                 break;
 398         }
 399
 400         return_ACPI_STATUS(status);
 401 }
 402
 403 /*******************************************************************************
 404  *
 405  * FUNCTION:    acpi_ex_cmos_space_handler
 406  *
 407  * PARAMETERS:  Function            - Read or Write operation
 408  *              Address             - Where in the space to read or write
 409  *              bit_width           - Field width in bits (8, 16, or 32)
 410  *              Value               - Pointer to in or out value
 411  *              handler_context     - Pointer to Handler's context
 412  *              region_context      - Pointer to context specific to the
 413  *                                    accessed region
 414  *
 415  * RETURN:      Status
 416  *
 417  * DESCRIPTION: Handler for the CMOS address space (Op Region)
 418  *
 419  ******************************************************************************/
 420
 421 acpi_status
 422 acpi_ex_cmos_space_handler(u32 function,
 423                            acpi_physical_address address,
 424                            u32 bit_width,
 425                            u64 *value,
 426                            void *handler_context, void *region_context)
 427 {
 428         acpi_status status = AE_OK;
 429
 430         ACPI_FUNCTION_TRACE(ex_cmos_space_handler);
 431
 432         return_ACPI_STATUS(status);
 433 }
 434
 435 /*******************************************************************************
 436  *
 437  * FUNCTION:    acpi_ex_pci_bar_space_handler
 438  *
 439  * PARAMETERS:  Function            - Read or Write operation
 440  *              Address             - Where in the space to read or write
 441  *              bit_width           - Field width in bits (8, 16, or 32)
 442  *              Value               - Pointer to in or out value
 443  *              handler_context     - Pointer to Handler's context
 444  *              region_context      - Pointer to context specific to the
 445  *                                    accessed region
 446  *
 447  * RETURN:      Status
 448  *
 449  * DESCRIPTION: Handler for the PCI bar_target address space (Op Region)
 450  *
 451  ******************************************************************************/
 452
 453 acpi_status
 454 acpi_ex_pci_bar_space_handler(u32 function,
 455                               acpi_physical_address address,
 456                               u32 bit_width,
 457                               u64 *value,
 458                               void *handler_context, void *region_context)
 459 {
 460         acpi_status status = AE_OK;
 461
 462         ACPI_FUNCTION_TRACE(ex_pci_bar_space_handler);
 463
 464         return_ACPI_STATUS(status);
 465 }
 466
 467 /*******************************************************************************
 468  *
 469  * FUNCTION:    acpi_ex_data_table_space_handler
 470  *
 471  * PARAMETERS:  Function            - Read or Write operation
 472  *              Address             - Where in the space to read or write
 473  *              bit_width           - Field width in bits (8, 16, or 32)
 474  *              Value               - Pointer to in or out value
 475  *              handler_context     - Pointer to Handler's context
 476  *              region_context      - Pointer to context specific to the
 477  *                                    accessed region
 478  *
 479  * RETURN:      Status
 480  *
 481  * DESCRIPTION: Handler for the Data Table address space (Op Region)
 482  *
 483  ******************************************************************************/
 484
 485 acpi_status
 486 acpi_ex_data_table_space_handler(u32 function,
 487                                  acpi_physical_address address,
 488                                  u32 bit_width,
 489                                  u64 *value,
 490                                  void *handler_context, void *region_context)
 491 {
 492         ACPI_FUNCTION_TRACE(ex_data_table_space_handler);
 493
 494         /*
 495          * Perform the memory read or write. The bit_width was already
 496          * validated.
 497          */
 498         switch (function) {
 499         case ACPI_READ:
 500
 501                 ACPI_MEMCPY(ACPI_CAST_PTR(char, value),
 502                             ACPI_PHYSADDR_TO_PTR(address),
 503                             ACPI_DIV_8(bit_width));
 504                 break;
 505
 506         case ACPI_WRITE:
 507
 508                 ACPI_MEMCPY(ACPI_PHYSADDR_TO_PTR(address),
 509                             ACPI_CAST_PTR(char, value), ACPI_DIV_8(bit_width));
 510                 break;
 511
 512         default:
 513
 514                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 515         }
 516
 517         return_ACPI_STATUS(AE_OK);
 518 }