drivers/acpi/acpica/exregion.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exregion - ACPI default op_region (address space) handlers
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2012, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "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                                     u64 *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 map_length;
  80         acpi_size page_boundary_map_length;
  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 %u",
 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((u64) address, length, NULL, &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             (((u64) address + length) > ((u64)
 130                                          mem_info->mapped_physical_address +
 131                                          mem_info->mapped_length))) {
 132                 /*
 133                  * The request cannot be resolved by the current memory mapping;
 134                  * Delete the existing mapping and create a new one.
 135                  */
 136                 if (mem_info->mapped_length) {
 137
 138                         /* Valid mapping, delete it */
 139
 140                         acpi_os_unmap_memory(mem_info->mapped_logical_address,
 141                                              mem_info->mapped_length);
 142                 }
 143
 144                 /*
 145                  * Attempt to map from the requested address to the end of the region.
 146                  * However, we will never map more than one page, nor will we cross
 147                  * a page boundary.
 148                  */
 149                 map_length = (acpi_size)
 150                     ((mem_info->address + mem_info->length) - address);
 151
 152                 /*
 153                  * If mapping the entire remaining portion of the region will cross
 154                  * a page boundary, just map up to the page boundary, do not cross.
 155                  * On some systems, crossing a page boundary while mapping regions
 156                  * can cause warnings if the pages have different attributes
 157                  * due to resource management
 158                  */
 159                 page_boundary_map_length =
 160                     ACPI_ROUND_UP(address, ACPI_DEFAULT_PAGE_SIZE) - address;
 161
 162                 if (!page_boundary_map_length) {
 163                         page_boundary_map_length = ACPI_DEFAULT_PAGE_SIZE;
 164                 }
 165
 166                 if (map_length > page_boundary_map_length) {
 167                         map_length = page_boundary_map_length;
 168                 }
 169
 170                 /* Create a new mapping starting at the address given */
 171
 172                 mem_info->mapped_logical_address = acpi_os_map_memory((acpi_physical_address) address, map_length);
 173                 if (!mem_info->mapped_logical_address) {
 174                         ACPI_ERROR((AE_INFO,
 175                                     "Could not map memory at 0x%8.8X%8.8X, size %u",
 176                                     ACPI_FORMAT_NATIVE_UINT(address),
 177                                     (u32) map_length));
 178                         mem_info->mapped_length = 0;
 179                         return_ACPI_STATUS(AE_NO_MEMORY);
 180                 }
 181
 182                 /* Save the physical address and mapping size */
 183
 184                 mem_info->mapped_physical_address = address;
 185                 mem_info->mapped_length = map_length;
 186         }
 187
 188         /*
 189          * Generate a logical pointer corresponding to the address we want to
 190          * access
 191          */
 192         logical_addr_ptr = mem_info->mapped_logical_address +
 193             ((u64) address - (u64) mem_info->mapped_physical_address);
 194
 195         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 196                           "System-Memory (width %u) R/W %u Address=%8.8X%8.8X\n",
 197                           bit_width, function,
 198                           ACPI_FORMAT_NATIVE_UINT(address)));
 199
 200         /*
 201          * Perform the memory read or write
 202          *
 203          * Note: For machines that do not support non-aligned transfers, the target
 204          * address was checked for alignment above. We do not attempt to break the
 205          * transfer up into smaller (byte-size) chunks because the AML specifically
 206          * asked for a transfer width that the hardware may require.
 207          */
 208         switch (function) {
 209         case ACPI_READ:
 210
 211                 *value = 0;
 212                 switch (bit_width) {
 213                 case 8:
 214                         *value = (u64) ACPI_GET8(logical_addr_ptr);
 215                         break;
 216
 217                 case 16:
 218                         *value = (u64) ACPI_GET16(logical_addr_ptr);
 219                         break;
 220
 221                 case 32:
 222                         *value = (u64) ACPI_GET32(logical_addr_ptr);
 223                         break;
 224
 225                 case 64:
 226                         *value = (u64) ACPI_GET64(logical_addr_ptr);
 227                         break;
 228
 229                 default:
 230                         /* bit_width was already validated */
 231                         break;
 232                 }
 233                 break;
 234
 235         case ACPI_WRITE:
 236
 237                 switch (bit_width) {
 238                 case 8:
 239                         ACPI_SET8(logical_addr_ptr) = (u8) * value;
 240                         break;
 241
 242                 case 16:
 243                         ACPI_SET16(logical_addr_ptr) = (u16) * value;
 244                         break;
 245
 246                 case 32:
 247                         ACPI_SET32(logical_addr_ptr) = (u32) * value;
 248                         break;
 249
 250                 case 64:
 251                         ACPI_SET64(logical_addr_ptr) = (u64) * value;
 252                         break;
 253
 254                 default:
 255                         /* bit_width was already validated */
 256                         break;
 257                 }
 258                 break;
 259
 260         default:
 261                 status = AE_BAD_PARAMETER;
 262                 break;
 263         }
 264
 265         return_ACPI_STATUS(status);
 266 }
 267
 268 /*******************************************************************************
 269  *
 270  * FUNCTION:    acpi_ex_system_io_space_handler
 271  *
 272  * PARAMETERS:  function            - Read or Write operation
 273  *              address             - Where in the space to read or write
 274  *              bit_width           - Field width in bits (8, 16, or 32)
 275  *              value               - Pointer to in or out value
 276  *              handler_context     - Pointer to Handler's context
 277  *              region_context      - Pointer to context specific to the
 278  *                                    accessed region
 279  *
 280  * RETURN:      Status
 281  *
 282  * DESCRIPTION: Handler for the System IO address space (Op Region)
 283  *
 284  ******************************************************************************/
 285
 286 acpi_status
 287 acpi_ex_system_io_space_handler(u32 function,
 288                                 acpi_physical_address address,
 289                                 u32 bit_width,
 290                                 u64 *value,
 291                                 void *handler_context, void *region_context)
 292 {
 293         acpi_status status = AE_OK;
 294         u32 value32;
 295
 296         ACPI_FUNCTION_TRACE(ex_system_io_space_handler);
 297
 298         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 299                           "System-IO (width %u) R/W %u Address=%8.8X%8.8X\n",
 300                           bit_width, function,
 301                           ACPI_FORMAT_NATIVE_UINT(address)));
 302
 303         /* Decode the function parameter */
 304
 305         switch (function) {
 306         case ACPI_READ:
 307
 308                 status = acpi_hw_read_port((acpi_io_address) address,
 309                                            &value32, bit_width);
 310                 *value = value32;
 311                 break;
 312
 313         case ACPI_WRITE:
 314
 315                 status = acpi_hw_write_port((acpi_io_address) address,
 316                                             (u32) * value, bit_width);
 317                 break;
 318
 319         default:
 320                 status = AE_BAD_PARAMETER;
 321                 break;
 322         }
 323
 324         return_ACPI_STATUS(status);
 325 }
 326
 327 /*******************************************************************************
 328  *
 329  * FUNCTION:    acpi_ex_pci_config_space_handler
 330  *
 331  * PARAMETERS:  function            - Read or Write operation
 332  *              address             - Where in the space to read or write
 333  *              bit_width           - Field width in bits (8, 16, or 32)
 334  *              value               - Pointer to in or out value
 335  *              handler_context     - Pointer to Handler's context
 336  *              region_context      - Pointer to context specific to the
 337  *                                    accessed region
 338  *
 339  * RETURN:      Status
 340  *
 341  * DESCRIPTION: Handler for the PCI Config address space (Op Region)
 342  *
 343  ******************************************************************************/
 344
 345 acpi_status
 346 acpi_ex_pci_config_space_handler(u32 function,
 347                                  acpi_physical_address address,
 348                                  u32 bit_width,
 349                                  u64 *value,
 350                                  void *handler_context, void *region_context)
 351 {
 352         acpi_status status = AE_OK;
 353         struct acpi_pci_id *pci_id;
 354         u16 pci_register;
 355
 356         ACPI_FUNCTION_TRACE(ex_pci_config_space_handler);
 357
 358         /*
 359          *  The arguments to acpi_os(Read|Write)pci_configuration are:
 360          *
 361          *  pci_segment is the PCI bus segment range 0-31
 362          *  pci_bus     is the PCI bus number range 0-255
 363          *  pci_device  is the PCI device number range 0-31
 364          *  pci_function is the PCI device function number
 365          *  pci_register is the Config space register range 0-255 bytes
 366          *
 367          *  value - input value for write, output address for read
 368          *
 369          */
 370         pci_id = (struct acpi_pci_id *)region_context;
 371         pci_register = (u16) (u32) address;
 372
 373         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 374                           "Pci-Config %u (%u) Seg(%04x) Bus(%04x) Dev(%04x) Func(%04x) Reg(%04x)\n",
 375                           function, bit_width, pci_id->segment, pci_id->bus,
 376                           pci_id->device, pci_id->function, pci_register));
 377
 378         switch (function) {
 379         case ACPI_READ:
 380
 381                 status = acpi_os_read_pci_configuration(pci_id, pci_register,
 382                                                         value, bit_width);
 383                 break;
 384
 385         case ACPI_WRITE:
 386
 387                 status = acpi_os_write_pci_configuration(pci_id, pci_register,
 388                                                          *value, bit_width);
 389                 break;
 390
 391         default:
 392
 393                 status = AE_BAD_PARAMETER;
 394                 break;
 395         }
 396
 397         return_ACPI_STATUS(status);
 398 }
 399
 400 /*******************************************************************************
 401  *
 402  * FUNCTION:    acpi_ex_cmos_space_handler
 403  *
 404  * PARAMETERS:  function            - Read or Write operation
 405  *              address             - Where in the space to read or write
 406  *              bit_width           - Field width in bits (8, 16, or 32)
 407  *              value               - Pointer to in or out value
 408  *              handler_context     - Pointer to Handler's context
 409  *              region_context      - Pointer to context specific to the
 410  *                                    accessed region
 411  *
 412  * RETURN:      Status
 413  *
 414  * DESCRIPTION: Handler for the CMOS address space (Op Region)
 415  *
 416  ******************************************************************************/
 417
 418 acpi_status
 419 acpi_ex_cmos_space_handler(u32 function,
 420                            acpi_physical_address address,
 421                            u32 bit_width,
 422                            u64 *value,
 423                            void *handler_context, void *region_context)
 424 {
 425         acpi_status status = AE_OK;
 426
 427         ACPI_FUNCTION_TRACE(ex_cmos_space_handler);
 428
 429         return_ACPI_STATUS(status);
 430 }
 431
 432 /*******************************************************************************
 433  *
 434  * FUNCTION:    acpi_ex_pci_bar_space_handler
 435  *
 436  * PARAMETERS:  function            - Read or Write operation
 437  *              address             - Where in the space to read or write
 438  *              bit_width           - Field width in bits (8, 16, or 32)
 439  *              value               - Pointer to in or out value
 440  *              handler_context     - Pointer to Handler's context
 441  *              region_context      - Pointer to context specific to the
 442  *                                    accessed region
 443  *
 444  * RETURN:      Status
 445  *
 446  * DESCRIPTION: Handler for the PCI bar_target address space (Op Region)
 447  *
 448  ******************************************************************************/
 449
 450 acpi_status
 451 acpi_ex_pci_bar_space_handler(u32 function,
 452                               acpi_physical_address address,
 453                               u32 bit_width,
 454                               u64 *value,
 455                               void *handler_context, void *region_context)
 456 {
 457         acpi_status status = AE_OK;
 458
 459         ACPI_FUNCTION_TRACE(ex_pci_bar_space_handler);
 460
 461         return_ACPI_STATUS(status);
 462 }
 463
 464 /*******************************************************************************
 465  *
 466  * FUNCTION:    acpi_ex_data_table_space_handler
 467  *
 468  * PARAMETERS:  function            - Read or Write operation
 469  *              address             - Where in the space to read or write
 470  *              bit_width           - Field width in bits (8, 16, or 32)
 471  *              value               - Pointer to in or out value
 472  *              handler_context     - Pointer to Handler's context
 473  *              region_context      - Pointer to context specific to the
 474  *                                    accessed region
 475  *
 476  * RETURN:      Status
 477  *
 478  * DESCRIPTION: Handler for the Data Table address space (Op Region)
 479  *
 480  ******************************************************************************/
 481
 482 acpi_status
 483 acpi_ex_data_table_space_handler(u32 function,
 484                                  acpi_physical_address address,
 485                                  u32 bit_width,
 486                                  u64 *value,
 487                                  void *handler_context, void *region_context)
 488 {
 489         ACPI_FUNCTION_TRACE(ex_data_table_space_handler);
 490
 491         /*
 492          * Perform the memory read or write. The bit_width was already
 493          * validated.
 494          */
 495         switch (function) {
 496         case ACPI_READ:
 497
 498                 ACPI_MEMCPY(ACPI_CAST_PTR(char, value),
 499                             ACPI_PHYSADDR_TO_PTR(address),
 500                             ACPI_DIV_8(bit_width));
 501                 break;
 502
 503         case ACPI_WRITE:
 504
 505                 ACPI_MEMCPY(ACPI_PHYSADDR_TO_PTR(address),
 506                             ACPI_CAST_PTR(char, value), ACPI_DIV_8(bit_width));
 507                 break;
 508
 509         default:
 510
 511                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 512         }
 513
 514         return_ACPI_STATUS(AE_OK);
 515 }