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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 | /******************************************************************************* * * Module Name: hwregs - Read/write access functions for the various ACPI * control and status registers. * ******************************************************************************/ /* * Copyright (C) 2000 - 2003, R. Byron Moore * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer, * without modification. * 2. Redistributions in binary form must reproduce at minimum a disclaimer * substantially similar to the "NO WARRANTY" disclaimer below * ("Disclaimer") and any redistribution must be conditioned upon * including a substantially similar Disclaimer requirement for further * binary redistribution. * 3. Neither the names of the above-listed copyright holders nor the names * of any contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * NO WARRANTY * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGES. */ #include <acpi/acpi.h> #include <acpi/acnamesp.h> #include <acpi/acevents.h> #define _COMPONENT ACPI_HARDWARE ACPI_MODULE_NAME ("hwregs") /******************************************************************************* * * FUNCTION: acpi_hw_clear_acpi_status * * PARAMETERS: Flags - Lock the hardware or not * * RETURN: none * * DESCRIPTION: Clears all fixed and general purpose status bits * ******************************************************************************/ acpi_status acpi_hw_clear_acpi_status ( u32 flags) { acpi_status status; ACPI_FUNCTION_TRACE ("hw_clear_acpi_status"); ACPI_DEBUG_PRINT ((ACPI_DB_IO, "About to write %04X to %04X\n", ACPI_BITMASK_ALL_FIXED_STATUS, (u16) acpi_gbl_FADT->xpm1a_evt_blk.address)); if (flags & ACPI_MTX_LOCK) { status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE); if (ACPI_FAILURE (status)) { return_ACPI_STATUS (status); } } status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1_STATUS, ACPI_BITMASK_ALL_FIXED_STATUS); if (ACPI_FAILURE (status)) { goto unlock_and_exit; } /* Clear the fixed events */ if (acpi_gbl_FADT->xpm1b_evt_blk.address) { status = acpi_hw_low_level_write (16, ACPI_BITMASK_ALL_FIXED_STATUS, &acpi_gbl_FADT->xpm1b_evt_blk); if (ACPI_FAILURE (status)) { goto unlock_and_exit; } } /* Clear the GPE Bits in all GPE registers in all GPE blocks */ status = acpi_ev_walk_gpe_list (acpi_hw_clear_gpe_block); unlock_and_exit: if (flags & ACPI_MTX_LOCK) { (void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE); } return_ACPI_STATUS (status); } /******************************************************************************* * * FUNCTION: acpi_get_sleep_type_data * * PARAMETERS: sleep_state - Numeric sleep state * *sleep_type_a - Where SLP_TYPa is returned * *sleep_type_b - Where SLP_TYPb is returned * * RETURN: Status - ACPI status * * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep * state. * ******************************************************************************/ acpi_status acpi_get_sleep_type_data ( u8 sleep_state, u8 *sleep_type_a, u8 *sleep_type_b) { acpi_status status = AE_OK; union acpi_operand_object *obj_desc; ACPI_FUNCTION_TRACE ("acpi_get_sleep_type_data"); /* * Validate parameters */ if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) { return_ACPI_STATUS (AE_BAD_PARAMETER); } /* * Evaluate the namespace object containing the values for this state */ status = acpi_ns_evaluate_by_name ((char *) acpi_gbl_db_sleep_states[sleep_state], NULL, &obj_desc); if (ACPI_FAILURE (status)) { ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%s while evaluating sleep_state [%s]\n", acpi_format_exception (status), acpi_gbl_db_sleep_states[sleep_state])); return_ACPI_STATUS (status); } /* Must have a return object */ if (!obj_desc) { ACPI_REPORT_ERROR (("Missing Sleep State object\n")); status = AE_NOT_EXIST; } /* It must be of type Package */ else if (ACPI_GET_OBJECT_TYPE (obj_desc) != ACPI_TYPE_PACKAGE) { ACPI_REPORT_ERROR (("Sleep State object not a Package\n")); status = AE_AML_OPERAND_TYPE; } /* The package must have at least two elements */ else if (obj_desc->package.count < 2) { ACPI_REPORT_ERROR (("Sleep State package does not have at least two elements\n")); status = AE_AML_NO_OPERAND; } /* The first two elements must both be of type Integer */ else if ((ACPI_GET_OBJECT_TYPE (obj_desc->package.elements[0]) != ACPI_TYPE_INTEGER) || (ACPI_GET_OBJECT_TYPE (obj_desc->package.elements[1]) != ACPI_TYPE_INTEGER)) { ACPI_REPORT_ERROR (("Sleep State package elements are not both Integers (%s, %s)\n", acpi_ut_get_object_type_name (obj_desc->package.elements[0]), acpi_ut_get_object_type_name (obj_desc->package.elements[1]))); status = AE_AML_OPERAND_TYPE; } else { /* * Valid _Sx_ package size, type, and value */ *sleep_type_a = (u8) (obj_desc->package.elements[0])->integer.value; *sleep_type_b = (u8) (obj_desc->package.elements[1])->integer.value; } if (ACPI_FAILURE (status)) { ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "While evaluating sleep_state [%s], bad Sleep object %p type %s\n", acpi_gbl_db_sleep_states[sleep_state], obj_desc, acpi_ut_get_object_type_name (obj_desc))); } acpi_ut_remove_reference (obj_desc); return_ACPI_STATUS (status); } /******************************************************************************* * * FUNCTION: acpi_hw_get_register_bit_mask * * PARAMETERS: register_id - Index of ACPI Register to access * * RETURN: The bit mask to be used when accessing the register * * DESCRIPTION: Map register_id into a register bit mask. * ******************************************************************************/ struct acpi_bit_register_info * acpi_hw_get_bit_register_info ( u32 register_id) { ACPI_FUNCTION_NAME ("hw_get_bit_register_info"); if (register_id > ACPI_BITREG_MAX) { ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid bit_register ID: %X\n", register_id)); return (NULL); } return (&acpi_gbl_bit_register_info[register_id]); } /******************************************************************************* * * FUNCTION: acpi_get_register * * PARAMETERS: register_id - ID of ACPI bit_register to access * return_value - Value that was read from the register * Flags - Lock the hardware or not * * RETURN: Value is read from specified Register. Value returned is * normalized to bit0 (is shifted all the way right) * * DESCRIPTION: ACPI bit_register read function. * ******************************************************************************/ acpi_status acpi_get_register ( u32 register_id, u32 *return_value, u32 flags) { u32 register_value = 0; struct acpi_bit_register_info *bit_reg_info; acpi_status status; ACPI_FUNCTION_TRACE ("acpi_get_register"); /* Get the info structure corresponding to the requested ACPI Register */ bit_reg_info = acpi_hw_get_bit_register_info (register_id); if (!bit_reg_info) { return_ACPI_STATUS (AE_BAD_PARAMETER); } if (flags & ACPI_MTX_LOCK) { status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE); if (ACPI_FAILURE (status)) { return_ACPI_STATUS (status); } } status = acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK, bit_reg_info->parent_register, ®ister_value); if (flags & ACPI_MTX_LOCK) { (void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE); } if (ACPI_SUCCESS (status)) { /* Normalize the value that was read */ register_value = ((register_value & bit_reg_info->access_bit_mask) >> bit_reg_info->bit_position); *return_value = register_value; ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Read value %8.8X register %X\n", register_value, bit_reg_info->parent_register)); } return_ACPI_STATUS (status); } /******************************************************************************* * * FUNCTION: acpi_set_register * * PARAMETERS: register_id - ID of ACPI bit_register to access * Value - (only used on write) value to write to the * Register, NOT pre-normalized to the bit pos. * Flags - Lock the hardware or not * * RETURN: None * * DESCRIPTION: ACPI Bit Register write function. * ******************************************************************************/ acpi_status acpi_set_register ( u32 register_id, u32 value, u32 flags) { u32 register_value = 0; struct acpi_bit_register_info *bit_reg_info; acpi_status status; ACPI_FUNCTION_TRACE_U32 ("acpi_set_register", register_id); /* Get the info structure corresponding to the requested ACPI Register */ bit_reg_info = acpi_hw_get_bit_register_info (register_id); if (!bit_reg_info) { ACPI_REPORT_ERROR (("Bad ACPI HW register_id: %X\n", register_id)); return_ACPI_STATUS (AE_BAD_PARAMETER); } if (flags & ACPI_MTX_LOCK) { status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE); if (ACPI_FAILURE (status)) { return_ACPI_STATUS (status); } } /* Always do a register read first so we can insert the new bits */ status = acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK, bit_reg_info->parent_register, ®ister_value); if (ACPI_FAILURE (status)) { goto unlock_and_exit; } /* * Decode the Register ID * Register ID = [Register block ID] | [bit ID] * * Check bit ID to fine locate Register offset. * Check Mask to determine Register offset, and then read-write. */ switch (bit_reg_info->parent_register) { case ACPI_REGISTER_PM1_STATUS: /* * Status Registers are different from the rest. Clear by * writing 1, and writing 0 has no effect. So, the only relevant * information is the single bit we're interested in, all others should * be written as 0 so they will be left unchanged. */ value = ACPI_REGISTER_PREPARE_BITS (value, bit_reg_info->bit_position, bit_reg_info->access_bit_mask); if (value) { status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1_STATUS, (u16) value); register_value = 0; } break; case ACPI_REGISTER_PM1_ENABLE: ACPI_REGISTER_INSERT_VALUE (register_value, bit_reg_info->bit_position, bit_reg_info->access_bit_mask, value); status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1_ENABLE, (u16) register_value); break; case ACPI_REGISTER_PM1_CONTROL: /* * Write the PM1 Control register. * Note that at this level, the fact that there are actually TWO * registers (A and B - and B may not exist) is abstracted. */ ACPI_DEBUG_PRINT ((ACPI_DB_IO, "PM1 control: Read %X\n", register_value)); ACPI_REGISTER_INSERT_VALUE (register_value, bit_reg_info->bit_position, bit_reg_info->access_bit_mask, value); status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1_CONTROL, (u16) register_value); break; case ACPI_REGISTER_PM2_CONTROL: status = acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM2_CONTROL, ®ister_value); if (ACPI_FAILURE (status)) { goto unlock_and_exit; } ACPI_DEBUG_PRINT ((ACPI_DB_IO, "PM2 control: Read %X from %8.8X%8.8X\n", register_value, ACPI_HIDWORD (acpi_gbl_FADT->xpm2_cnt_blk.address), ACPI_LODWORD (acpi_gbl_FADT->xpm2_cnt_blk.address))); ACPI_REGISTER_INSERT_VALUE (register_value, bit_reg_info->bit_position, bit_reg_info->access_bit_mask, value); ACPI_DEBUG_PRINT ((ACPI_DB_IO, "About to write %4.4X to %8.8X%8.8X\n", register_value, ACPI_HIDWORD (acpi_gbl_FADT->xpm2_cnt_blk.address), ACPI_LODWORD (acpi_gbl_FADT->xpm2_cnt_blk.address))); status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM2_CONTROL, (u8) (register_value)); break; default: break; } unlock_and_exit: if (flags & ACPI_MTX_LOCK) { (void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE); } /* Normalize the value that was read */ ACPI_DEBUG_EXEC (register_value = ((register_value & bit_reg_info->access_bit_mask) >> bit_reg_info->bit_position)); ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Set bits: %8.8X actual %8.8X register %X\n", value, register_value, bit_reg_info->parent_register)); return_ACPI_STATUS (status); } /****************************************************************************** * * FUNCTION: acpi_hw_register_read * * PARAMETERS: use_lock - Mutex hw access. * register_id - register_iD + Offset. * * RETURN: Value read or written. * * DESCRIPTION: Acpi register read function. Registers are read at the * given offset. * ******************************************************************************/ acpi_status acpi_hw_register_read ( u8 use_lock, u32 register_id, u32 *return_value) { u32 value1 = 0; u32 value2 = 0; acpi_status status; ACPI_FUNCTION_TRACE ("hw_register_read"); if (ACPI_MTX_LOCK == use_lock) { status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE); if (ACPI_FAILURE (status)) { return_ACPI_STATUS (status); } } switch (register_id) { case ACPI_REGISTER_PM1_STATUS: /* 16-bit access */ status = acpi_hw_low_level_read (16, &value1, &acpi_gbl_FADT->xpm1a_evt_blk); if (ACPI_FAILURE (status)) { goto unlock_and_exit; } /* PM1B is optional */ status = acpi_hw_low_level_read (16, &value2, &acpi_gbl_FADT->xpm1b_evt_blk); value1 |= value2; break; case ACPI_REGISTER_PM1_ENABLE: /* 16-bit access */ status = acpi_hw_low_level_read (16, &value1, &acpi_gbl_xpm1a_enable); if (ACPI_FAILURE (status)) { goto unlock_and_exit; } /* PM1B is optional */ status = acpi_hw_low_level_read (16, &value2, &acpi_gbl_xpm1b_enable); value1 |= value2; break; case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */ status = acpi_hw_low_level_read (16, &value1, &acpi_gbl_FADT->xpm1a_cnt_blk); if (ACPI_FAILURE (status)) { goto unlock_and_exit; } status = acpi_hw_low_level_read (16, &value2, &acpi_gbl_FADT->xpm1b_cnt_blk); value1 |= value2; break; case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */ status = acpi_hw_low_level_read (8, &value1, &acpi_gbl_FADT->xpm2_cnt_blk); break; case ACPI_REGISTER_PM_TIMER: /* 32-bit access */ status = acpi_hw_low_level_read (32, &value1, &acpi_gbl_FADT->xpm_tmr_blk); break; case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */ status = acpi_os_read_port (acpi_gbl_FADT->smi_cmd, &value1, 8); break; default: ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown Register ID: %X\n", register_id)); status = AE_BAD_PARAMETER; break; } unlock_and_exit: if (ACPI_MTX_LOCK == use_lock) { (void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE); } if (ACPI_SUCCESS (status)) { *return_value = value1; } return_ACPI_STATUS (status); } /****************************************************************************** * * FUNCTION: acpi_hw_register_write * * PARAMETERS: use_lock - Mutex hw access. * register_id - register_iD + Offset. * * RETURN: Value read or written. * * DESCRIPTION: Acpi register Write function. Registers are written at the * given offset. * ******************************************************************************/ acpi_status acpi_hw_register_write ( u8 use_lock, u32 register_id, u32 value) { acpi_status status; ACPI_FUNCTION_TRACE ("hw_register_write"); if (ACPI_MTX_LOCK == use_lock) { status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE); if (ACPI_FAILURE (status)) { return_ACPI_STATUS (status); } } switch (register_id) { case ACPI_REGISTER_PM1_STATUS: /* 16-bit access */ status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1a_evt_blk); if (ACPI_FAILURE (status)) { goto unlock_and_exit; } /* PM1B is optional */ status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1b_evt_blk); break; case ACPI_REGISTER_PM1_ENABLE: /* 16-bit access*/ status = acpi_hw_low_level_write (16, value, &acpi_gbl_xpm1a_enable); if (ACPI_FAILURE (status)) { goto unlock_and_exit; } /* PM1B is optional */ status = acpi_hw_low_level_write (16, value, &acpi_gbl_xpm1b_enable); break; case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */ status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1a_cnt_blk); if (ACPI_FAILURE (status)) { goto unlock_and_exit; } status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1b_cnt_blk); break; case ACPI_REGISTER_PM1A_CONTROL: /* 16-bit access */ status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1a_cnt_blk); break; case ACPI_REGISTER_PM1B_CONTROL: /* 16-bit access */ status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1b_cnt_blk); break; case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */ status = acpi_hw_low_level_write (8, value, &acpi_gbl_FADT->xpm2_cnt_blk); break; case ACPI_REGISTER_PM_TIMER: /* 32-bit access */ status = acpi_hw_low_level_write (32, value, &acpi_gbl_FADT->xpm_tmr_blk); break; case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */ /* SMI_CMD is currently always in IO space */ status = acpi_os_write_port (acpi_gbl_FADT->smi_cmd, value, 8); break; default: status = AE_BAD_PARAMETER; break; } unlock_and_exit: if (ACPI_MTX_LOCK == use_lock) { (void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE); } return_ACPI_STATUS (status); } /****************************************************************************** * * FUNCTION: acpi_hw_low_level_read * * PARAMETERS: Width - 8, 16, or 32 * Value - Where the value is returned * Register - GAS register structure * * RETURN: Status * * DESCRIPTION: Read from either memory, IO, or PCI config space. * ******************************************************************************/ acpi_status acpi_hw_low_level_read ( u32 width, u32 *value, struct acpi_generic_address *reg) { struct acpi_pci_id pci_id; u16 pci_register; acpi_status status; ACPI_FUNCTION_NAME ("hw_low_level_read"); /* * Must have a valid pointer to a GAS structure, and * a non-zero address within. However, don't return an error * because the PM1A/B code must not fail if B isn't present. */ if ((!reg) || (!reg->address)) { return (AE_OK); } *value = 0; /* * Three address spaces supported: * Memory, IO, or PCI_Config. */ switch (reg->address_space_id) { case ACPI_ADR_SPACE_SYSTEM_MEMORY: status = acpi_os_read_memory ( (acpi_physical_address) reg->address, value, width); break; case ACPI_ADR_SPACE_SYSTEM_IO: status = acpi_os_read_port ((acpi_io_address) reg->address, value, width); break; case ACPI_ADR_SPACE_PCI_CONFIG: pci_id.segment = 0; pci_id.bus = 0; pci_id.device = ACPI_PCI_DEVICE (reg->address); pci_id.function = ACPI_PCI_FUNCTION (reg->address); pci_register = (u16) ACPI_PCI_REGISTER (reg->address); status = acpi_os_read_pci_configuration (&pci_id, pci_register, value, width); break; default: ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unsupported address space: %X\n", reg->address_space_id)); return (AE_BAD_PARAMETER); } ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Read: %8.8X width %2d from %8.8X%8.8X (%s)\n", *value, width, ACPI_HIDWORD (reg->address), ACPI_LODWORD (reg->address), acpi_ut_get_region_name (reg->address_space_id))); return (status); } /****************************************************************************** * * FUNCTION: acpi_hw_low_level_write * * PARAMETERS: Width - 8, 16, or 32 * Value - To be written * Register - GAS register structure * * RETURN: Status * * DESCRIPTION: Write to either memory, IO, or PCI config space. * ******************************************************************************/ acpi_status acpi_hw_low_level_write ( u32 width, u32 value, struct acpi_generic_address *reg) { struct acpi_pci_id pci_id; u16 pci_register; acpi_status status; ACPI_FUNCTION_NAME ("hw_low_level_write"); /* * Must have a valid pointer to a GAS structure, and * a non-zero address within. However, don't return an error * because the PM1A/B code must not fail if B isn't present. */ if ((!reg) || (!reg->address)) { return (AE_OK); } /* * Three address spaces supported: * Memory, IO, or PCI_Config. */ switch (reg->address_space_id) { case ACPI_ADR_SPACE_SYSTEM_MEMORY: status = acpi_os_write_memory ( (acpi_physical_address) reg->address, value, width); break; case ACPI_ADR_SPACE_SYSTEM_IO: status = acpi_os_write_port ((acpi_io_address) reg->address, value, width); break; case ACPI_ADR_SPACE_PCI_CONFIG: pci_id.segment = 0; pci_id.bus = 0; pci_id.device = ACPI_PCI_DEVICE (reg->address); pci_id.function = ACPI_PCI_FUNCTION (reg->address); pci_register = (u16) ACPI_PCI_REGISTER (reg->address); status = acpi_os_write_pci_configuration (&pci_id, pci_register, (acpi_integer) value, width); break; default: ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unsupported address space: %X\n", reg->address_space_id)); return (AE_BAD_PARAMETER); } ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Wrote: %8.8X width %2d to %8.8X%8.8X (%s)\n", value, width, ACPI_HIDWORD (reg->address), ACPI_LODWORD (reg->address), acpi_ut_get_region_name (reg->address_space_id))); return (status); } |