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 - 2005, R. Byron Moore
  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
  46 #include <acpi/acpi.h>
  47 #include <acpi/acinterp.h>
  48
  49
  50 #define _COMPONENT          ACPI_EXECUTER
  51          ACPI_MODULE_NAME    ("exregion")
  52
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_ex_system_memory_space_handler
  57  *
  58  * PARAMETERS:  Function            - Read or Write operation
  59  *              Address             - Where in the space to read or write
  60  *              bit_width           - Field width in bits (8, 16, or 32)
  61  *              Value               - Pointer to in or out value
  62  *              handler_context     - Pointer to Handler's context
  63  *              region_context      - Pointer to context specific to the
  64  *                                    accessed region
  65  *
  66  * RETURN:      Status
  67  *
  68  * DESCRIPTION: Handler for the System Memory address space (Op Region)
  69  *
  70  ******************************************************************************/
  71
  72 acpi_status
  73 acpi_ex_system_memory_space_handler (
  74         u32                             function,
  75         acpi_physical_address           address,
  76         u32                             bit_width,
  77         acpi_integer                    *value,
  78         void                            *handler_context,
  79         void                            *region_context)
  80 {
  81         acpi_status                     status = AE_OK;
  82         void                            *logical_addr_ptr = NULL;
  83         struct acpi_mem_space_context   *mem_info = region_context;
  84         u32                             length;
  85         acpi_size                       window_size;
  86 #ifndef ACPI_MISALIGNED_TRANSFERS
  87         u32                             remainder;
  88 #endif
  89
  90         ACPI_FUNCTION_TRACE ("ex_system_memory_space_handler");
  91
  92
  93         /* Validate and translate the bit width */
  94
  95         switch (bit_width) {
  96         case 8:
  97                 length = 1;
  98                 break;
  99
 100         case 16:
 101                 length = 2;
 102                 break;
 103
 104         case 32:
 105                 length = 4;
 106                 break;
 107
 108         case 64:
 109                 length = 8;
 110                 break;
 111
 112         default:
 113                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid system_memory width %d\n",
 114                         bit_width));
 115                 return_ACPI_STATUS (AE_AML_OPERAND_VALUE);
 116         }
 117
 118 #ifndef ACPI_MISALIGNED_TRANSFERS
 119         /*
 120          * Hardware does not support non-aligned data transfers, we must verify
 121          * the request.
 122          */
 123         (void) acpi_ut_short_divide ((acpi_integer) address, length, NULL, &remainder);
 124         if (remainder != 0) {
 125                 return_ACPI_STATUS (AE_AML_ALIGNMENT);
 126         }
 127 #endif
 128
 129         /*
 130          * Does the request fit into the cached memory mapping?
 131          * Is 1) Address below the current mapping? OR
 132          *    2) Address beyond the current mapping?
 133          */
 134         if ((address < mem_info->mapped_physical_address) ||
 135                 (((acpi_integer) address + length) >
 136                         ((acpi_integer)
 137                         mem_info->mapped_physical_address + mem_info->mapped_length))) {
 138                 /*
 139                  * The request cannot be resolved by the current memory mapping;
 140                  * Delete the existing mapping and create a new one.
 141                  */
 142                 if (mem_info->mapped_length) {
 143                         /* Valid mapping, delete it */
 144
 145                         acpi_os_unmap_memory (mem_info->mapped_logical_address,
 146                                            mem_info->mapped_length);
 147                 }
 148
 149                 /*
 150                  * Don't attempt to map memory beyond the end of the region, and
 151                  * constrain the maximum mapping size to something reasonable.
 152                  */
 153                 window_size = (acpi_size)
 154                         ((mem_info->address + mem_info->length) - address);
 155
 156                 if (window_size > ACPI_SYSMEM_REGION_WINDOW_SIZE) {
 157                         window_size = ACPI_SYSMEM_REGION_WINDOW_SIZE;
 158                 }
 159
 160                 /* Create a new mapping starting at the address given */
 161
 162                 status = acpi_os_map_memory (address, window_size,
 163                                   (void **) &mem_info->mapped_logical_address);
 164                 if (ACPI_FAILURE (status)) {
 165                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 166                                 "Could not map memory at %8.8X%8.8X, size %X\n",
 167                                 ACPI_FORMAT_UINT64 (address), (u32) window_size));
 168                         mem_info->mapped_length = 0;
 169                         return_ACPI_STATUS (status);
 170                 }
 171
 172                 /* Save the physical address and mapping size */
 173
 174                 mem_info->mapped_physical_address = address;
 175                 mem_info->mapped_length = window_size;
 176         }
 177
 178         /*
 179          * Generate a logical pointer corresponding to the address we want to
 180          * access
 181          */
 182         logical_addr_ptr = mem_info->mapped_logical_address +
 183                            ((acpi_integer) address -
 184                                           (acpi_integer) mem_info->mapped_physical_address);
 185
 186         ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 187                         "system_memory %d (%d width) Address=%8.8X%8.8X\n",
 188                         function, bit_width,
 189                         ACPI_FORMAT_UINT64 (address)));
 190
 191    /*
 192         * Perform the memory read or write
 193         *
 194         * Note: For machines that do not support non-aligned transfers, the target
 195         * address was checked for alignment above.  We do not attempt to break the
 196         * transfer up into smaller (byte-size) chunks because the AML specifically
 197         * asked for a transfer width that the hardware may require.
 198         */
 199         switch (function) {
 200         case ACPI_READ:
 201
 202                 *value = 0;
 203                 switch (bit_width) {
 204                 case 8:
 205                         *value = (acpi_integer) *((u8 *) logical_addr_ptr);
 206                         break;
 207
 208                 case 16:
 209                         *value = (acpi_integer) *((u16 *) logical_addr_ptr);
 210                         break;
 211
 212                 case 32:
 213                         *value = (acpi_integer) *((u32 *) logical_addr_ptr);
 214                         break;
 215
 216 #if ACPI_MACHINE_WIDTH != 16
 217                 case 64:
 218                         *value = (acpi_integer) *((u64 *) logical_addr_ptr);
 219                         break;
 220 #endif
 221                 default:
 222                         /* bit_width was already validated */
 223                         break;
 224                 }
 225                 break;
 226
 227         case ACPI_WRITE:
 228
 229                 switch (bit_width) {
 230                 case 8:
 231                         *(u8 *) logical_addr_ptr = (u8) *value;
 232                         break;
 233
 234                 case 16:
 235                         *(u16 *) logical_addr_ptr = (u16) *value;
 236                         break;
 237
 238                 case 32:
 239                         *(u32 *) logical_addr_ptr = (u32) *value;
 240                         break;
 241
 242 #if ACPI_MACHINE_WIDTH != 16
 243                 case 64:
 244                         *(u64 *) logical_addr_ptr = (u64) *value;
 245                         break;
 246 #endif
 247
 248                 default:
 249                         /* bit_width was already validated */
 250                         break;
 251                 }
 252                 break;
 253
 254         default:
 255                 status = AE_BAD_PARAMETER;
 256                 break;
 257         }
 258
 259         return_ACPI_STATUS (status);
 260 }
 261
 262
 263 /*******************************************************************************
 264  *
 265  * FUNCTION:    acpi_ex_system_io_space_handler
 266  *
 267  * PARAMETERS:  Function            - Read or Write operation
 268  *              Address             - Where in the space to read or write
 269  *              bit_width           - Field width in bits (8, 16, or 32)
 270  *              Value               - Pointer to in or out value
 271  *              handler_context     - Pointer to Handler's context
 272  *              region_context      - Pointer to context specific to the
 273  *                                    accessed region
 274  *
 275  * RETURN:      Status
 276  *
 277  * DESCRIPTION: Handler for the System IO address space (Op Region)
 278  *
 279  ******************************************************************************/
 280
 281 acpi_status
 282 acpi_ex_system_io_space_handler (
 283         u32                             function,
 284         acpi_physical_address           address,
 285         u32                             bit_width,
 286         acpi_integer                    *value,
 287         void                            *handler_context,
 288         void                            *region_context)
 289 {
 290         acpi_status                     status = AE_OK;
 291         u32                             value32;
 292
 293
 294         ACPI_FUNCTION_TRACE ("ex_system_io_space_handler");
 295
 296
 297         ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 298                         "system_iO %d (%d width) Address=%8.8X%8.8X\n", function, bit_width,
 299                         ACPI_FORMAT_UINT64 (address)));
 300
 301         /* Decode the function parameter */
 302
 303         switch (function) {
 304         case ACPI_READ:
 305
 306                 status = acpi_os_read_port ((acpi_io_address) address,
 307                                  &value32, bit_width);
 308                 *value = value32;
 309                 break;
 310
 311         case ACPI_WRITE:
 312
 313                 status = acpi_os_write_port ((acpi_io_address) address,
 314                                  (u32) *value, bit_width);
 315                 break;
 316
 317         default:
 318                 status = AE_BAD_PARAMETER;
 319                 break;
 320         }
 321
 322         return_ACPI_STATUS (status);
 323 }
 324
 325
 326 /*******************************************************************************
 327  *
 328  * FUNCTION:    acpi_ex_pci_config_space_handler
 329  *
 330  * PARAMETERS:  Function            - Read or Write operation
 331  *              Address             - Where in the space to read or write
 332  *              bit_width           - Field width in bits (8, 16, or 32)
 333  *              Value               - Pointer to in or out value
 334  *              handler_context     - Pointer to Handler's context
 335  *              region_context      - Pointer to context specific to the
 336  *                                    accessed region
 337  *
 338  * RETURN:      Status
 339  *
 340  * DESCRIPTION: Handler for the PCI Config address space (Op Region)
 341  *
 342  ******************************************************************************/
 343
 344 acpi_status
 345 acpi_ex_pci_config_space_handler (
 346         u32                             function,
 347         acpi_physical_address           address,
 348         u32                             bit_width,
 349         acpi_integer                    *value,
 350         void                            *handler_context,
 351         void                            *region_context)
 352 {
 353         acpi_status                     status = AE_OK;
 354         struct acpi_pci_id              *pci_id;
 355         u16                             pci_register;
 356
 357
 358         ACPI_FUNCTION_TRACE ("ex_pci_config_space_handler");
 359
 360
 361         /*
 362          *  The arguments to acpi_os(Read|Write)pci_configuration are:
 363          *
 364          *  pci_segment is the PCI bus segment range 0-31
 365          *  pci_bus     is the PCI bus number range 0-255
 366          *  pci_device  is the PCI device number range 0-31
 367          *  pci_function is the PCI device function number
 368          *  pci_register is the Config space register range 0-255 bytes
 369          *
 370          *  Value - input value for write, output address for read
 371          *
 372          */
 373         pci_id      = (struct acpi_pci_id *) region_context;
 374         pci_register = (u16) (u32) address;
 375
 376         ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 377                 "pci_config %d (%d) Seg(%04x) Bus(%04x) Dev(%04x) Func(%04x) Reg(%04x)\n",
 378                 function, bit_width, pci_id->segment, pci_id->bus, pci_id->device,
 379                 pci_id->function, pci_register));
 380
 381         switch (function) {
 382         case ACPI_READ:
 383
 384                 *value = 0;
 385                 status = acpi_os_read_pci_configuration (pci_id, pci_register,
 386                                  value, bit_width);
 387                 break;
 388
 389         case ACPI_WRITE:
 390
 391                 status = acpi_os_write_pci_configuration (pci_id, pci_register,
 392                                  *value, bit_width);
 393                 break;
 394
 395         default:
 396
 397                 status = AE_BAD_PARAMETER;
 398                 break;
 399         }
 400
 401         return_ACPI_STATUS (status);
 402 }
 403
 404
 405 /*******************************************************************************
 406  *
 407  * FUNCTION:    acpi_ex_cmos_space_handler
 408  *
 409  * PARAMETERS:  Function            - Read or Write operation
 410  *              Address             - Where in the space to read or write
 411  *              bit_width           - Field width in bits (8, 16, or 32)
 412  *              Value               - Pointer to in or out value
 413  *              handler_context     - Pointer to Handler's context
 414  *              region_context      - Pointer to context specific to the
 415  *                                    accessed region
 416  *
 417  * RETURN:      Status
 418  *
 419  * DESCRIPTION: Handler for the CMOS address space (Op Region)
 420  *
 421  ******************************************************************************/
 422
 423 acpi_status
 424 acpi_ex_cmos_space_handler (
 425         u32                             function,
 426         acpi_physical_address           address,
 427         u32                             bit_width,
 428         acpi_integer                    *value,
 429         void                            *handler_context,
 430         void                            *region_context)
 431 {
 432         acpi_status                     status = AE_OK;
 433
 434
 435         ACPI_FUNCTION_TRACE ("ex_cmos_space_handler");
 436
 437
 438         return_ACPI_STATUS (status);
 439 }
 440
 441
 442 /*******************************************************************************
 443  *
 444  * FUNCTION:    acpi_ex_pci_bar_space_handler
 445  *
 446  * PARAMETERS:  Function            - Read or Write operation
 447  *              Address             - Where in the space to read or write
 448  *              bit_width           - Field width in bits (8, 16, or 32)
 449  *              Value               - Pointer to in or out value
 450  *              handler_context     - Pointer to Handler's context
 451  *              region_context      - Pointer to context specific to the
 452  *                                    accessed region
 453  *
 454  * RETURN:      Status
 455  *
 456  * DESCRIPTION: Handler for the PCI bar_target address space (Op Region)
 457  *
 458  ******************************************************************************/
 459
 460 acpi_status
 461 acpi_ex_pci_bar_space_handler (
 462         u32                             function,
 463         acpi_physical_address           address,
 464         u32                             bit_width,
 465         acpi_integer                    *value,
 466         void                            *handler_context,
 467         void                            *region_context)
 468 {
 469         acpi_status                     status = AE_OK;
 470
 471
 472         ACPI_FUNCTION_TRACE ("ex_pci_bar_space_handler");
 473
 474
 475         return_ACPI_STATUS (status);
 476 }
 477
 478
 479 /*******************************************************************************
 480  *
 481  * FUNCTION:    acpi_ex_data_table_space_handler
 482  *
 483  * PARAMETERS:  Function            - Read or Write operation
 484  *              Address             - Where in the space to read or write
 485  *              bit_width           - Field width in bits (8, 16, or 32)
 486  *              Value               - Pointer to in or out value
 487  *              handler_context     - Pointer to Handler's context
 488  *              region_context      - Pointer to context specific to the
 489  *                                    accessed region
 490  *
 491  * RETURN:      Status
 492  *
 493  * DESCRIPTION: Handler for the Data Table address space (Op Region)
 494  *
 495  ******************************************************************************/
 496
 497 acpi_status
 498 acpi_ex_data_table_space_handler (
 499         u32                             function,
 500         acpi_physical_address           address,
 501         u32                             bit_width,
 502         acpi_integer                    *value,
 503         void                            *handler_context,
 504         void                            *region_context)
 505 {
 506         acpi_status                     status = AE_OK;
 507         u32                             byte_width = ACPI_DIV_8 (bit_width);
 508         u32                             i;
 509         char                            *logical_addr_ptr;
 510
 511
 512         ACPI_FUNCTION_TRACE ("ex_data_table_space_handler");
 513
 514
 515         logical_addr_ptr = ACPI_PHYSADDR_TO_PTR (address);
 516
 517         /* Perform the memory read or write */
 518
 519         switch (function) {
 520         case ACPI_READ:
 521
 522                 for (i = 0; i < byte_width; i++) {
 523                         ((char *) value) [i] = logical_addr_ptr[i];
 524                 }
 525                 break;
 526
 527         case ACPI_WRITE:
 528         default:
 529
 530                 return_ACPI_STATUS (AE_SUPPORT);
 531         }
 532
 533         return_ACPI_STATUS (status);
 534 }
 535
 536