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