git.oblomov.eu Git - linux-2.6/blob - 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
  49 ACPI_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  ******************************************************************************/
  68 acpi_status
  69 acpi_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
 274 acpi_status
 275 acpi_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
 333 acpi_status
 334 acpi_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
 408 acpi_status
 409 acpi_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
 440 acpi_status
 441 acpi_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
 472 acpi_status
 473 acpi_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 }