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 - 2013, 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
  92                 length = 1;
  93                 break;
  94
  95         case 16:
  96
  97                 length = 2;
  98                 break;
  99
 100         case 32:
 101
 102                 length = 4;
 103                 break;
 104
 105         case 64:
 106
 107                 length = 8;
 108                 break;
 109
 110         default:
 111
 112                 ACPI_ERROR((AE_INFO, "Invalid SystemMemory width %u",
 113                             bit_width));
 114                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 115         }
 116
 117 #ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
 118         /*
 119          * Hardware does not support non-aligned data transfers, we must verify
 120          * the request.
 121          */
 122         (void)acpi_ut_short_divide((u64) address, length, NULL, &remainder);
 123         if (remainder != 0) {
 124                 return_ACPI_STATUS(AE_AML_ALIGNMENT);
 125         }
 126 #endif
 127
 128         /*
 129          * Does the request fit into the cached memory mapping?
 130          * Is 1) Address below the current mapping? OR
 131          *    2) Address beyond the current mapping?
 132          */
 133         if ((address < mem_info->mapped_physical_address) ||
 134             (((u64) address + length) > ((u64)
 135                                          mem_info->mapped_physical_address +
 136                                          mem_info->mapped_length))) {
 137                 /*
 138                  * The request cannot be resolved by the current memory mapping;
 139                  * Delete the existing mapping and create a new one.
 140                  */
 141                 if (mem_info->mapped_length) {
 142
 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                  * October 2009: Attempt to map from the requested address to the
 151                  * end of the region. However, we will never map more than one
 152                  * page, nor will we cross a page boundary.
 153                  */
 154                 map_length = (acpi_size)
 155                     ((mem_info->address + mem_info->length) - address);
 156
 157                 /*
 158                  * If mapping the entire remaining portion of the region will cross
 159                  * a page boundary, just map up to the page boundary, do not cross.
 160                  * On some systems, crossing a page boundary while mapping regions
 161                  * can cause warnings if the pages have different attributes
 162                  * due to resource management.
 163                  *
 164                  * This has the added benefit of constraining a single mapping to
 165                  * one page, which is similar to the original code that used a 4k
 166                  * maximum window.
 167                  */
 168                 page_boundary_map_length =
 169                     ACPI_ROUND_UP(address, ACPI_DEFAULT_PAGE_SIZE) - address;
 170                 if (page_boundary_map_length == 0) {
 171                         page_boundary_map_length = ACPI_DEFAULT_PAGE_SIZE;
 172                 }
 173
 174                 if (map_length > page_boundary_map_length) {
 175                         map_length = page_boundary_map_length;
 176                 }
 177
 178                 /* Create a new mapping starting at the address given */
 179
 180                 mem_info->mapped_logical_address = acpi_os_map_memory((acpi_physical_address) address, map_length);
 181                 if (!mem_info->mapped_logical_address) {
 182                         ACPI_ERROR((AE_INFO,
 183                                     "Could not map memory at 0x%8.8X%8.8X, size %u",
 184                                     ACPI_FORMAT_NATIVE_UINT(address),
 185                                     (u32) map_length));
 186                         mem_info->mapped_length = 0;
 187                         return_ACPI_STATUS(AE_NO_MEMORY);
 188                 }
 189
 190                 /* Save the physical address and mapping size */
 191
 192                 mem_info->mapped_physical_address = address;
 193                 mem_info->mapped_length = map_length;
 194         }
 195
 196         /*
 197          * Generate a logical pointer corresponding to the address we want to
 198          * access
 199          */
 200         logical_addr_ptr = mem_info->mapped_logical_address +
 201             ((u64) address - (u64) mem_info->mapped_physical_address);
 202
 203         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 204                           "System-Memory (width %u) R/W %u Address=%8.8X%8.8X\n",
 205                           bit_width, function,
 206                           ACPI_FORMAT_NATIVE_UINT(address)));
 207
 208         /*
 209          * Perform the memory read or write
 210          *
 211          * Note: For machines that do not support non-aligned transfers, the target
 212          * address was checked for alignment above. We do not attempt to break the
 213          * transfer up into smaller (byte-size) chunks because the AML specifically
 214          * asked for a transfer width that the hardware may require.
 215          */
 216         switch (function) {
 217         case ACPI_READ:
 218
 219                 *value = 0;
 220                 switch (bit_width) {
 221                 case 8:
 222
 223                         *value = (u64)ACPI_GET8(logical_addr_ptr);
 224                         break;
 225
 226                 case 16:
 227
 228                         *value = (u64)ACPI_GET16(logical_addr_ptr);
 229                         break;
 230
 231                 case 32:
 232
 233                         *value = (u64)ACPI_GET32(logical_addr_ptr);
 234                         break;
 235
 236                 case 64:
 237
 238                         *value = (u64)ACPI_GET64(logical_addr_ptr);
 239                         break;
 240
 241                 default:
 242
 243                         /* bit_width was already validated */
 244
 245                         break;
 246                 }
 247                 break;
 248
 249         case ACPI_WRITE:
 250
 251                 switch (bit_width) {
 252                 case 8:
 253
 254                         ACPI_SET8(logical_addr_ptr, *value);
 255                         break;
 256
 257                 case 16:
 258
 259                         ACPI_SET16(logical_addr_ptr, *value);
 260                         break;
 261
 262                 case 32:
 263
 264                         ACPI_SET32(logical_addr_ptr, *value);
 265                         break;
 266
 267                 case 64:
 268
 269                         ACPI_SET64(logical_addr_ptr, *value);
 270                         break;
 271
 272                 default:
 273
 274                         /* bit_width was already validated */
 275
 276                         break;
 277                 }
 278                 break;
 279
 280         default:
 281
 282                 status = AE_BAD_PARAMETER;
 283                 break;
 284         }
 285
 286         return_ACPI_STATUS(status);
 287 }
 288
 289 /*******************************************************************************
 290  *
 291  * FUNCTION:    acpi_ex_system_io_space_handler
 292  *
 293  * PARAMETERS:  function            - Read or Write operation
 294  *              address             - Where in the space to read or write
 295  *              bit_width           - Field width in bits (8, 16, or 32)
 296  *              value               - Pointer to in or out value
 297  *              handler_context     - Pointer to Handler's context
 298  *              region_context      - Pointer to context specific to the
 299  *                                    accessed region
 300  *
 301  * RETURN:      Status
 302  *
 303  * DESCRIPTION: Handler for the System IO address space (Op Region)
 304  *
 305  ******************************************************************************/
 306
 307 acpi_status
 308 acpi_ex_system_io_space_handler(u32 function,
 309                                 acpi_physical_address address,
 310                                 u32 bit_width,
 311                                 u64 *value,
 312                                 void *handler_context, void *region_context)
 313 {
 314         acpi_status status = AE_OK;
 315         u32 value32;
 316
 317         ACPI_FUNCTION_TRACE(ex_system_io_space_handler);
 318
 319         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 320                           "System-IO (width %u) R/W %u Address=%8.8X%8.8X\n",
 321                           bit_width, function,
 322                           ACPI_FORMAT_NATIVE_UINT(address)));
 323
 324         /* Decode the function parameter */
 325
 326         switch (function) {
 327         case ACPI_READ:
 328
 329                 status = acpi_hw_read_port((acpi_io_address) address,
 330                                            &value32, bit_width);
 331                 *value = value32;
 332                 break;
 333
 334         case ACPI_WRITE:
 335
 336                 status = acpi_hw_write_port((acpi_io_address) address,
 337                                             (u32) * value, bit_width);
 338                 break;
 339
 340         default:
 341
 342                 status = AE_BAD_PARAMETER;
 343                 break;
 344         }
 345
 346         return_ACPI_STATUS(status);
 347 }
 348
 349 /*******************************************************************************
 350  *
 351  * FUNCTION:    acpi_ex_pci_config_space_handler
 352  *
 353  * PARAMETERS:  function            - Read or Write operation
 354  *              address             - Where in the space to read or write
 355  *              bit_width           - Field width in bits (8, 16, or 32)
 356  *              value               - Pointer to in or out value
 357  *              handler_context     - Pointer to Handler's context
 358  *              region_context      - Pointer to context specific to the
 359  *                                    accessed region
 360  *
 361  * RETURN:      Status
 362  *
 363  * DESCRIPTION: Handler for the PCI Config address space (Op Region)
 364  *
 365  ******************************************************************************/
 366
 367 acpi_status
 368 acpi_ex_pci_config_space_handler(u32 function,
 369                                  acpi_physical_address address,
 370                                  u32 bit_width,
 371                                  u64 *value,
 372                                  void *handler_context, void *region_context)
 373 {
 374         acpi_status status = AE_OK;
 375         struct acpi_pci_id *pci_id;
 376         u16 pci_register;
 377
 378         ACPI_FUNCTION_TRACE(ex_pci_config_space_handler);
 379
 380         /*
 381          *  The arguments to acpi_os(Read|Write)pci_configuration are:
 382          *
 383          *  pci_segment is the PCI bus segment range 0-31
 384          *  pci_bus     is the PCI bus number range 0-255
 385          *  pci_device  is the PCI device number range 0-31
 386          *  pci_function is the PCI device function number
 387          *  pci_register is the Config space register range 0-255 bytes
 388          *
 389          *  value - input value for write, output address for read
 390          *
 391          */
 392         pci_id = (struct acpi_pci_id *)region_context;
 393         pci_register = (u16) (u32) address;
 394
 395         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 396                           "Pci-Config %u (%u) Seg(%04x) Bus(%04x) Dev(%04x) Func(%04x) Reg(%04x)\n",
 397                           function, bit_width, pci_id->segment, pci_id->bus,
 398                           pci_id->device, pci_id->function, pci_register));
 399
 400         switch (function) {
 401         case ACPI_READ:
 402
 403                 *value = 0;
 404                 status = acpi_os_read_pci_configuration(pci_id, pci_register,
 405                                                         value, bit_width);
 406                 break;
 407
 408         case ACPI_WRITE:
 409
 410                 status = acpi_os_write_pci_configuration(pci_id, pci_register,
 411                                                          *value, bit_width);
 412                 break;
 413
 414         default:
 415
 416                 status = AE_BAD_PARAMETER;
 417                 break;
 418         }
 419
 420         return_ACPI_STATUS(status);
 421 }
 422
 423 /*******************************************************************************
 424  *
 425  * FUNCTION:    acpi_ex_cmos_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 CMOS address space (Op Region)
 438  *
 439  ******************************************************************************/
 440
 441 acpi_status
 442 acpi_ex_cmos_space_handler(u32 function,
 443                            acpi_physical_address address,
 444                            u32 bit_width,
 445                            u64 *value,
 446                            void *handler_context, void *region_context)
 447 {
 448         acpi_status status = AE_OK;
 449
 450         ACPI_FUNCTION_TRACE(ex_cmos_space_handler);
 451
 452         return_ACPI_STATUS(status);
 453 }
 454
 455 /*******************************************************************************
 456  *
 457  * FUNCTION:    acpi_ex_pci_bar_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 PCI bar_target address space (Op Region)
 470  *
 471  ******************************************************************************/
 472
 473 acpi_status
 474 acpi_ex_pci_bar_space_handler(u32 function,
 475                               acpi_physical_address address,
 476                               u32 bit_width,
 477                               u64 *value,
 478                               void *handler_context, void *region_context)
 479 {
 480         acpi_status status = AE_OK;
 481
 482         ACPI_FUNCTION_TRACE(ex_pci_bar_space_handler);
 483
 484         return_ACPI_STATUS(status);
 485 }
 486
 487 /*******************************************************************************
 488  *
 489  * FUNCTION:    acpi_ex_data_table_space_handler
 490  *
 491  * PARAMETERS:  function            - Read or Write operation
 492  *              address             - Where in the space to read or write
 493  *              bit_width           - Field width in bits (8, 16, or 32)
 494  *              value               - Pointer to in or out value
 495  *              handler_context     - Pointer to Handler's context
 496  *              region_context      - Pointer to context specific to the
 497  *                                    accessed region
 498  *
 499  * RETURN:      Status
 500  *
 501  * DESCRIPTION: Handler for the Data Table address space (Op Region)
 502  *
 503  ******************************************************************************/
 504
 505 acpi_status
 506 acpi_ex_data_table_space_handler(u32 function,
 507                                  acpi_physical_address address,
 508                                  u32 bit_width,
 509                                  u64 *value,
 510                                  void *handler_context, void *region_context)
 511 {
 512         ACPI_FUNCTION_TRACE(ex_data_table_space_handler);
 513
 514         /*
 515          * Perform the memory read or write. The bit_width was already
 516          * validated.
 517          */
 518         switch (function) {
 519         case ACPI_READ:
 520
 521                 ACPI_MEMCPY(ACPI_CAST_PTR(char, value),
 522                             ACPI_PHYSADDR_TO_PTR(address),
 523                             ACPI_DIV_8(bit_width));
 524                 break;
 525
 526         case ACPI_WRITE:
 527
 528                 ACPI_MEMCPY(ACPI_PHYSADDR_TO_PTR(address),
 529                             ACPI_CAST_PTR(char, value), ACPI_DIV_8(bit_width));
 530                 break;
 531
 532         default:
 533
 534                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 535         }
 536
 537         return_ACPI_STATUS(AE_OK);
 538 }