drivers/acpi/acpica/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 "accommon.h"
  47 #include "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 map_length;
  81         acpi_size page_boundary_map_length;
  82 #ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
  83         u32 remainder;
  84 #endif
  85
  86         ACPI_FUNCTION_TRACE(ex_system_memory_space_handler);
  87
  88         /* Validate and translate the bit width */
  89
  90         switch (bit_width) {
  91         case 8:
  92                 length = 1;
  93                 break;
  94
  95         case 16:
  96                 length = 2;
  97                 break;
  98
  99         case 32:
 100                 length = 4;
 101                 break;
 102
 103         case 64:
 104                 length = 8;
 105                 break;
 106
 107         default:
 108                 ACPI_ERROR((AE_INFO, "Invalid SystemMemory width %d",
 109                             bit_width));
 110                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 111         }
 112
 113 #ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
 114         /*
 115          * Hardware does not support non-aligned data transfers, we must verify
 116          * the request.
 117          */
 118         (void)acpi_ut_short_divide((acpi_integer) address, length, NULL,
 119                                    &remainder);
 120         if (remainder != 0) {
 121                 return_ACPI_STATUS(AE_AML_ALIGNMENT);
 122         }
 123 #endif
 124
 125         /*
 126          * Does the request fit into the cached memory mapping?
 127          * Is 1) Address below the current mapping? OR
 128          *    2) Address beyond the current mapping?
 129          */
 130         if ((address < mem_info->mapped_physical_address) ||
 131             (((acpi_integer) address + length) > ((acpi_integer)
 132                                                   mem_info->
 133                                                   mapped_physical_address +
 134                                                   mem_info->mapped_length))) {
 135                 /*
 136                  * The request cannot be resolved by the current memory mapping;
 137                  * Delete the existing mapping and create a new one.
 138                  */
 139                 if (mem_info->mapped_length) {
 140
 141                         /* Valid mapping, delete it */
 142
 143                         acpi_os_unmap_memory(mem_info->mapped_logical_address,
 144                                              mem_info->mapped_length);
 145                 }
 146
 147                 /*
 148                  * Attempt to map from the requested address to the end of the region.
 149                  * However, we will never map more than one page, nor will we cross
 150                  * a page boundary.
 151                  */
 152                 map_length = (acpi_size)
 153                     ((mem_info->address + mem_info->length) - address);
 154
 155                 /*
 156                  * If mapping the entire remaining portion of the region will cross
 157                  * a page boundary, just map up to the page boundary, do not cross.
 158                  * On some systems, crossing a page boundary while mapping regions
 159                  * can cause warnings if the pages have different attributes
 160                  * due to resource management
 161                  */
 162                 page_boundary_map_length =
 163                     ACPI_ROUND_UP(address, ACPI_DEFAULT_PAGE_SIZE) - address;
 164
 165                 if (!page_boundary_map_length) {
 166                         page_boundary_map_length = ACPI_DEFAULT_PAGE_SIZE;
 167                 }
 168
 169                 if (map_length > page_boundary_map_length) {
 170                         map_length = page_boundary_map_length;
 171                 }
 172
 173                 /* Create a new mapping starting at the address given */
 174
 175                 mem_info->mapped_logical_address = acpi_os_map_memory((acpi_physical_address) address, map_length);
 176                 if (!mem_info->mapped_logical_address) {
 177                         ACPI_ERROR((AE_INFO,
 178                                     "Could not map memory at %8.8X%8.8X, size %X",
 179                                     ACPI_FORMAT_NATIVE_UINT(address),
 180                                     (u32) map_length));
 181                         mem_info->mapped_length = 0;
 182                         return_ACPI_STATUS(AE_NO_MEMORY);
 183                 }
 184
 185                 /* Save the physical address and mapping size */
 186
 187                 mem_info->mapped_physical_address = address;
 188                 mem_info->mapped_length = map_length;
 189         }
 190
 191         /*
 192          * Generate a logical pointer corresponding to the address we want to
 193          * access
 194          */
 195         logical_addr_ptr = mem_info->mapped_logical_address +
 196             ((acpi_integer) address -
 197              (acpi_integer) mem_info->mapped_physical_address);
 198
 199         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 200                           "System-Memory (width %d) R/W %d Address=%8.8X%8.8X\n",
 201                           bit_width, function,
 202                           ACPI_FORMAT_NATIVE_UINT(address)));
 203
 204         /*
 205          * Perform the memory read or write
 206          *
 207          * Note: For machines that do not support non-aligned transfers, the target
 208          * address was checked for alignment above.  We do not attempt to break the
 209          * transfer up into smaller (byte-size) chunks because the AML specifically
 210          * asked for a transfer width that the hardware may require.
 211          */
 212         switch (function) {
 213         case ACPI_READ:
 214
 215                 *value = 0;
 216                 switch (bit_width) {
 217                 case 8:
 218                         *value = (acpi_integer) ACPI_GET8(logical_addr_ptr);
 219                         break;
 220
 221                 case 16:
 222                         *value = (acpi_integer) ACPI_GET16(logical_addr_ptr);
 223                         break;
 224
 225                 case 32:
 226                         *value = (acpi_integer) ACPI_GET32(logical_addr_ptr);
 227                         break;
 228
 229                 case 64:
 230                         *value = (acpi_integer) ACPI_GET64(logical_addr_ptr);
 231                         break;
 232
 233                 default:
 234                         /* bit_width was already validated */
 235                         break;
 236                 }
 237                 break;
 238
 239         case ACPI_WRITE:
 240
 241                 switch (bit_width) {
 242                 case 8:
 243                         ACPI_SET8(logical_addr_ptr) = (u8) * value;
 244                         break;
 245
 246                 case 16:
 247                         ACPI_SET16(logical_addr_ptr) = (u16) * value;
 248                         break;
 249
 250                 case 32:
 251                         ACPI_SET32(logical_addr_ptr) = (u32) * value;
 252                         break;
 253
 254                 case 64:
 255                         ACPI_SET64(logical_addr_ptr) = (u64) * value;
 256                         break;
 257
 258                 default:
 259                         /* bit_width was already validated */
 260                         break;
 261                 }
 262                 break;
 263
 264         default:
 265                 status = AE_BAD_PARAMETER;
 266                 break;
 267         }
 268
 269         return_ACPI_STATUS(status);
 270 }
 271
 272 /*******************************************************************************
 273  *
 274  * FUNCTION:    acpi_ex_system_io_space_handler
 275  *
 276  * PARAMETERS:  Function            - Read or Write operation
 277  *              Address             - Where in the space to read or write
 278  *              bit_width           - Field width in bits (8, 16, or 32)
 279  *              Value               - Pointer to in or out value
 280  *              handler_context     - Pointer to Handler's context
 281  *              region_context      - Pointer to context specific to the
 282  *                                    accessed region
 283  *
 284  * RETURN:      Status
 285  *
 286  * DESCRIPTION: Handler for the System IO address space (Op Region)
 287  *
 288  ******************************************************************************/
 289
 290 acpi_status
 291 acpi_ex_system_io_space_handler(u32 function,
 292                                 acpi_physical_address address,
 293                                 u32 bit_width,
 294                                 acpi_integer * value,
 295                                 void *handler_context, void *region_context)
 296 {
 297         acpi_status status = AE_OK;
 298         u32 value32;
 299
 300         ACPI_FUNCTION_TRACE(ex_system_io_space_handler);
 301
 302         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 303                           "System-IO (width %d) R/W %d Address=%8.8X%8.8X\n",
 304                           bit_width, function,
 305                           ACPI_FORMAT_NATIVE_UINT(address)));
 306
 307         /* Decode the function parameter */
 308
 309         switch (function) {
 310         case ACPI_READ:
 311
 312                 status = acpi_hw_read_port((acpi_io_address) address,
 313                                            &value32, bit_width);
 314                 *value = value32;
 315                 break;
 316
 317         case ACPI_WRITE:
 318
 319                 status = acpi_hw_write_port((acpi_io_address) address,
 320                                             (u32) * value, bit_width);
 321                 break;
 322
 323         default:
 324                 status = AE_BAD_PARAMETER;
 325                 break;
 326         }
 327
 328         return_ACPI_STATUS(status);
 329 }
 330
 331 /*******************************************************************************
 332  *
 333  * FUNCTION:    acpi_ex_pci_config_space_handler
 334  *
 335  * PARAMETERS:  Function            - Read or Write operation
 336  *              Address             - Where in the space to read or write
 337  *              bit_width           - Field width in bits (8, 16, or 32)
 338  *              Value               - Pointer to in or out value
 339  *              handler_context     - Pointer to Handler's context
 340  *              region_context      - Pointer to context specific to the
 341  *                                    accessed region
 342  *
 343  * RETURN:      Status
 344  *
 345  * DESCRIPTION: Handler for the PCI Config address space (Op Region)
 346  *
 347  ******************************************************************************/
 348
 349 acpi_status
 350 acpi_ex_pci_config_space_handler(u32 function,
 351                                  acpi_physical_address address,
 352                                  u32 bit_width,
 353                                  acpi_integer * value,
 354                                  void *handler_context, void *region_context)
 355 {
 356         acpi_status status = AE_OK;
 357         struct acpi_pci_id *pci_id;
 358         u16 pci_register;
 359         u32 value32;
 360
 361         ACPI_FUNCTION_TRACE(ex_pci_config_space_handler);
 362
 363         /*
 364          *  The arguments to acpi_os(Read|Write)pci_configuration are:
 365          *
 366          *  pci_segment is the PCI bus segment range 0-31
 367          *  pci_bus     is the PCI bus number range 0-255
 368          *  pci_device  is the PCI device number range 0-31
 369          *  pci_function is the PCI device function number
 370          *  pci_register is the Config space register range 0-255 bytes
 371          *
 372          *  Value - input value for write, output address for read
 373          *
 374          */
 375         pci_id = (struct acpi_pci_id *)region_context;
 376         pci_register = (u16) (u32) address;
 377
 378         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 379                           "Pci-Config %d (%d) Seg(%04x) Bus(%04x) Dev(%04x) Func(%04x) Reg(%04x)\n",
 380                           function, bit_width, pci_id->segment, pci_id->bus,
 381                           pci_id->device, pci_id->function, pci_register));
 382
 383         switch (function) {
 384         case ACPI_READ:
 385
 386                 status = acpi_os_read_pci_configuration(pci_id, pci_register,
 387                                                         &value32, bit_width);
 388                 *value = value32;
 389                 break;
 390
 391         case ACPI_WRITE:
 392
 393                 status = acpi_os_write_pci_configuration(pci_id, pci_register,
 394                                                          *value, bit_width);
 395                 break;
 396
 397         default:
 398
 399                 status = AE_BAD_PARAMETER;
 400                 break;
 401         }
 402
 403         return_ACPI_STATUS(status);
 404 }
 405
 406 /*******************************************************************************
 407  *
 408  * FUNCTION:    acpi_ex_cmos_space_handler
 409  *
 410  * PARAMETERS:  Function            - Read or Write operation
 411  *              Address             - Where in the space to read or write
 412  *              bit_width           - Field width in bits (8, 16, or 32)
 413  *              Value               - Pointer to in or out value
 414  *              handler_context     - Pointer to Handler's context
 415  *              region_context      - Pointer to context specific to the
 416  *                                    accessed region
 417  *
 418  * RETURN:      Status
 419  *
 420  * DESCRIPTION: Handler for the CMOS address space (Op Region)
 421  *
 422  ******************************************************************************/
 423
 424 acpi_status
 425 acpi_ex_cmos_space_handler(u32 function,
 426                            acpi_physical_address address,
 427                            u32 bit_width,
 428                            acpi_integer * value,
 429                            void *handler_context, void *region_context)
 430 {
 431         acpi_status status = AE_OK;
 432
 433         ACPI_FUNCTION_TRACE(ex_cmos_space_handler);
 434
 435         return_ACPI_STATUS(status);
 436 }
 437
 438 /*******************************************************************************
 439  *
 440  * FUNCTION:    acpi_ex_pci_bar_space_handler
 441  *
 442  * PARAMETERS:  Function            - Read or Write operation
 443  *              Address             - Where in the space to read or write
 444  *              bit_width           - Field width in bits (8, 16, or 32)
 445  *              Value               - Pointer to in or out value
 446  *              handler_context     - Pointer to Handler's context
 447  *              region_context      - Pointer to context specific to the
 448  *                                    accessed region
 449  *
 450  * RETURN:      Status
 451  *
 452  * DESCRIPTION: Handler for the PCI bar_target address space (Op Region)
 453  *
 454  ******************************************************************************/
 455
 456 acpi_status
 457 acpi_ex_pci_bar_space_handler(u32 function,
 458                               acpi_physical_address address,
 459                               u32 bit_width,
 460                               acpi_integer * value,
 461                               void *handler_context, void *region_context)
 462 {
 463         acpi_status status = AE_OK;
 464
 465         ACPI_FUNCTION_TRACE(ex_pci_bar_space_handler);
 466
 467         return_ACPI_STATUS(status);
 468 }
 469
 470 /*******************************************************************************
 471  *
 472  * FUNCTION:    acpi_ex_data_table_space_handler
 473  *
 474  * PARAMETERS:  Function            - Read or Write operation
 475  *              Address             - Where in the space to read or write
 476  *              bit_width           - Field width in bits (8, 16, or 32)
 477  *              Value               - Pointer to in or out value
 478  *              handler_context     - Pointer to Handler's context
 479  *              region_context      - Pointer to context specific to the
 480  *                                    accessed region
 481  *
 482  * RETURN:      Status
 483  *
 484  * DESCRIPTION: Handler for the Data Table address space (Op Region)
 485  *
 486  ******************************************************************************/
 487
 488 acpi_status
 489 acpi_ex_data_table_space_handler(u32 function,
 490                                  acpi_physical_address address,
 491                                  u32 bit_width,
 492                                  acpi_integer * value,
 493                                  void *handler_context, void *region_context)
 494 {
 495         ACPI_FUNCTION_TRACE(ex_data_table_space_handler);
 496
 497         /* Perform the memory read or write */
 498
 499         switch (function) {
 500         case ACPI_READ:
 501
 502                 ACPI_MEMCPY(ACPI_CAST_PTR(char, value),
 503                             ACPI_PHYSADDR_TO_PTR(address),
 504                             ACPI_DIV_8(bit_width));
 505                 break;
 506
 507         case ACPI_WRITE:
 508         default:
 509
 510                 return_ACPI_STATUS(AE_SUPPORT);
 511         }
 512
 513         return_ACPI_STATUS(AE_OK);
 514 }