drivers/acpi/interpreter/amregion.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: amregion - ACPI default Op_region (address space) handlers
   5  *              $Revision: 41 $
   6  *
   7  *****************************************************************************/
   8
   9 /*
  10  *  Copyright (C) 2000 R. Byron Moore
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  */
  26
  27
  28 #include "acpi.h"
  29 #include "acinterp.h"
  30 #include "amlcode.h"
  31 #include "acnamesp.h"
  32 #include "achware.h"
  33 #include "acevents.h"
  34
  35
  36 #define _COMPONENT          INTERPRETER
  37          MODULE_NAME         ("amregion")
  38
  39
  40 /*******************************************************************************
  41  *
  42  * FUNCTION:    Acpi_aml_system_memory_space_handler
  43  *
  44  * PARAMETERS:  Function            - Read or Write operation
  45  *              Address             - Where in the space to read or write
  46  *              Bit_width           - Field width in bits (8, 16, or 32)
  47  *              Value               - Pointer to in or out value
  48  *              Handler_context     - Pointer to Handler's context
  49  *              Region_context      - Pointer to context specific to the
  50  *                                      accessed region
  51  *
  52  * RETURN:      Status
  53  *
  54  * DESCRIPTION: Handler for the System Memory address space (Op Region)
  55  *
  56  ******************************************************************************/
  57
  58 ACPI_STATUS
  59 acpi_aml_system_memory_space_handler (
  60         u32                     function,
  61         ACPI_PHYSICAL_ADDRESS   address,
  62         u32                     bit_width,
  63         u32                     *value,
  64         void                    *handler_context,
  65         void                    *region_context)
  66 {
  67         ACPI_STATUS             status = AE_OK;
  68         void                    *logical_addr_ptr = NULL;
  69         MEM_HANDLER_CONTEXT     *mem_info = region_context;
  70         u32                     length;
  71
  72
  73         /* Validate and translate the bit width */
  74
  75         switch (bit_width)
  76         {
  77         case 8:
  78                 length = 1;
  79                 break;
  80
  81         case 16:
  82                 length = 2;
  83                 break;
  84
  85         case 32:
  86                 length = 4;
  87                 break;
  88
  89         default:
  90                 return (AE_AML_OPERAND_VALUE);
  91                 break;
  92         }
  93
  94
  95         /*
  96          * Does the request fit into the cached memory mapping?
  97          * Is 1) Address below the current mapping? OR
  98          *    2) Address beyond the current mapping?
  99          */
 100
 101         if ((address < mem_info->mapped_physical_address) ||
 102                 ((address + length) >
 103                         (mem_info->mapped_physical_address + mem_info->mapped_length)))
 104         {
 105                 /*
 106                  * The request cannot be resolved by the current memory mapping;
 107                  * Delete the existing mapping and create a new one.
 108                  */
 109
 110                 if (mem_info->mapped_length) {
 111                         /* Valid mapping, delete it */
 112
 113                         acpi_os_unmap_memory (mem_info->mapped_logical_address,
 114                                            mem_info->mapped_length);
 115                 }
 116
 117                 mem_info->mapped_length = 0; /* In case of failure below */
 118
 119                 /* Create a new mapping starting at the address given */
 120
 121                 status = acpi_os_map_memory (address, SYSMEM_REGION_WINDOW_SIZE,
 122                                   (void **) &mem_info->mapped_logical_address);
 123                 if (ACPI_FAILURE (status)) {
 124                         return (status);
 125                 }
 126
 127                 /* TBD: should these pointers go to 64-bit in all cases ? */
 128
 129                 mem_info->mapped_physical_address = address;
 130                 mem_info->mapped_length = SYSMEM_REGION_WINDOW_SIZE;
 131         }
 132
 133
 134         /*
 135          * Generate a logical pointer corresponding to the address we want to
 136          * access
 137          */
 138
 139         /* TBD: should these pointers go to 64-bit in all cases ? */
 140
 141         logical_addr_ptr = mem_info->mapped_logical_address +
 142                           (address - mem_info->mapped_physical_address);
 143
 144         /* Perform the memory read or write */
 145
 146         switch (function)
 147         {
 148
 149         case ADDRESS_SPACE_READ:
 150
 151                 switch (bit_width)
 152                 {
 153                 case 8:
 154                         *value = (u32)* (u8 *) logical_addr_ptr;
 155                         break;
 156
 157                 case 16:
 158                         MOVE_UNALIGNED16_TO_32 (value, logical_addr_ptr);
 159                         break;
 160
 161                 case 32:
 162                         MOVE_UNALIGNED32_TO_32 (value, logical_addr_ptr);
 163                         break;
 164                 }
 165
 166                 break;
 167
 168
 169         case ADDRESS_SPACE_WRITE:
 170
 171                 switch (bit_width)
 172                 {
 173                 case 8:
 174                         *(u8 *) logical_addr_ptr = (u8) *value;
 175                         break;
 176
 177                 case 16:
 178                         MOVE_UNALIGNED16_TO_16 (logical_addr_ptr, value);
 179                         break;
 180
 181                 case 32:
 182                         MOVE_UNALIGNED32_TO_32 (logical_addr_ptr, value);
 183                         break;
 184                 }
 185
 186                 break;
 187
 188
 189         default:
 190                 status = AE_BAD_PARAMETER;
 191                 break;
 192         }
 193
 194         return (status);
 195 }
 196
 197
 198 /*******************************************************************************
 199  *
 200  * FUNCTION:    Acpi_aml_system_io_space_handler
 201  *
 202  * PARAMETERS:  Function            - Read or Write operation
 203  *              Address             - Where in the space to read or write
 204  *              Bit_width           - Field width in bits (8, 16, or 32)
 205  *              Value               - Pointer to in or out value
 206  *              Handler_context     - Pointer to Handler's context
 207  *              Region_context      - Pointer to context specific to the
 208  *                                      accessed region
 209  *
 210  * RETURN:      Status
 211  *
 212  * DESCRIPTION: Handler for the System IO address space (Op Region)
 213  *
 214  ******************************************************************************/
 215
 216 ACPI_STATUS
 217 acpi_aml_system_io_space_handler (
 218         u32                     function,
 219         ACPI_PHYSICAL_ADDRESS   address,
 220         u32                     bit_width,
 221         u32                     *value,
 222         void                    *handler_context,
 223         void                    *region_context)
 224 {
 225         ACPI_STATUS             status = AE_OK;
 226
 227
 228         /* Decode the function parameter */
 229
 230         switch (function)
 231         {
 232
 233         case ADDRESS_SPACE_READ:
 234
 235                 switch (bit_width)
 236                 {
 237                 /* I/O Port width */
 238
 239                 case 8:
 240                         *value = (u32) acpi_os_in8 ((ACPI_IO_ADDRESS) address);
 241                         break;
 242
 243                 case 16:
 244                         *value = (u32) acpi_os_in16 ((ACPI_IO_ADDRESS) address);
 245                         break;
 246
 247                 case 32:
 248                         *value = acpi_os_in32 ((ACPI_IO_ADDRESS) address);
 249                         break;
 250
 251                 default:
 252                         status = AE_AML_OPERAND_VALUE;
 253                 }
 254
 255                 break;
 256
 257
 258         case ADDRESS_SPACE_WRITE:
 259
 260                 switch (bit_width)
 261                 {
 262                 /* I/O Port width */
 263                 case 8:
 264                         acpi_os_out8 ((ACPI_IO_ADDRESS) address, (u8) *value);
 265                         break;
 266
 267                 case 16:
 268                         acpi_os_out16 ((ACPI_IO_ADDRESS) address, (u16) *value);
 269                         break;
 270
 271                 case 32:
 272                         acpi_os_out32 ((ACPI_IO_ADDRESS) address, *value);
 273                         break;
 274
 275                 default:
 276                         status = AE_AML_OPERAND_VALUE;
 277                 }
 278
 279                 break;
 280
 281
 282         default:
 283                 status = AE_BAD_PARAMETER;
 284                 break;
 285         }
 286
 287         return (status);
 288 }
 289
 290 /*******************************************************************************
 291  *
 292  * FUNCTION:    Acpi_aml_pci_config_space_handler
 293  *
 294  * PARAMETERS:  Function            - Read or Write operation
 295  *              Address             - Where in the space to read or write
 296  *              Bit_width           - Field width in bits (8, 16, or 32)
 297  *              Value               - Pointer to in or out value
 298  *              Handler_context     - Pointer to Handler's context
 299  *              Region_context      - Pointer to context specific to the
 300  *                                      accessed region
 301  *
 302  * RETURN:      Status
 303  *
 304  * DESCRIPTION: Handler for the PCI Config address space (Op Region)
 305  *
 306  ******************************************************************************/
 307
 308 ACPI_STATUS
 309 acpi_aml_pci_config_space_handler (
 310         u32                     function,
 311         ACPI_PHYSICAL_ADDRESS   address,
 312         u32                     bit_width,
 313         u32                     *value,
 314         void                    *handler_context,
 315         void                    *region_context)
 316 {
 317         ACPI_STATUS             status = AE_OK;
 318         u32                     pci_bus;
 319         u32                     dev_func;
 320         u8                      pci_reg;
 321         PCI_HANDLER_CONTEXT    *PCIcontext;
 322
 323
 324         /*
 325          *  The arguments to Acpi_os(Read|Write)Pci_cfg(Byte|Word|Dword) are:
 326          *
 327          *  Seg_bus - 0xSSSSBBBB    - SSSS is the PCI bus segment
 328          *                            BBBB is the PCI bus number
 329          *
 330          *  Dev_func - 0xDDDDFFFF   - DDDD is the PCI device number
 331          *                            FFFF is the PCI device function number
 332          *
 333          *  Reg_num - Config space register must be < 40h
 334          *
 335          *  Value - input value for write, output for read
 336          *
 337          */
 338
 339         PCIcontext = (PCI_HANDLER_CONTEXT *) region_context;
 340
 341         pci_bus = LOWORD(PCIcontext->seg) << 16;
 342         pci_bus |= LOWORD(PCIcontext->bus);
 343
 344         dev_func = PCIcontext->dev_func;
 345
 346         pci_reg = (u8) address;
 347
 348         switch (function)
 349         {
 350
 351         case ADDRESS_SPACE_READ:
 352
 353                 *value  = 0;
 354
 355                 switch (bit_width)
 356                 {
 357                 /* PCI Register width */
 358
 359                 case 8:
 360                         status = acpi_os_read_pci_cfg_byte (pci_bus, dev_func, pci_reg,
 361                                            (u8 *) value);
 362                         break;
 363
 364                 case 16:
 365                         status = acpi_os_read_pci_cfg_word (pci_bus, dev_func, pci_reg,
 366                                            (u16 *) value);
 367                         break;
 368
 369                 case 32:
 370                         status = acpi_os_read_pci_cfg_dword (pci_bus, dev_func, pci_reg,
 371                                            value);
 372                         break;
 373
 374                 default:
 375                         status = AE_AML_OPERAND_VALUE;
 376
 377                 } /* Switch bit_width */
 378
 379                 break;
 380
 381
 382         case ADDRESS_SPACE_WRITE:
 383
 384                 switch (bit_width)
 385                 {
 386                 /* PCI Register width */
 387
 388                 case 8:
 389                         status = acpi_os_write_pci_cfg_byte (pci_bus, dev_func, pci_reg,
 390                                          *(u8 *) value);
 391                         break;
 392
 393                 case 16:
 394                         status = acpi_os_write_pci_cfg_word (pci_bus, dev_func, pci_reg,
 395                                          *(u16 *) value);
 396                         break;
 397
 398                 case 32:
 399                         status = acpi_os_write_pci_cfg_dword (pci_bus, dev_func, pci_reg,
 400                                          *value);
 401                         break;
 402
 403                 default:
 404                         status = AE_AML_OPERAND_VALUE;
 405
 406                 } /* Switch bit_width */
 407
 408                 break;
 409
 410
 411         default:
 412
 413                 status = AE_BAD_PARAMETER;
 414                 break;
 415
 416         }
 417
 418         return (status);
 419 }
 420