| 1 | /******************************************************************************* |
| 2 | * |
| 3 | * Module Name: hwregs - Read/write access functions for the various ACPI |
| 4 | * control and status registers. |
| 5 | * |
| 6 | ******************************************************************************/ |
| 7 | |
| 8 | /* |
| 9 | * Copyright (C) 2000 - 2016, 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.h" |
| 46 | #include "accommon.h" |
| 47 | #include "acevents.h" |
| 48 | |
| 49 | #define _COMPONENT ACPI_HARDWARE |
| 50 | ACPI_MODULE_NAME ("hwregs" ) |
| 51 | |
| 52 | |
| 53 | #if (!ACPI_REDUCED_HARDWARE) |
| 54 | |
| 55 | /* Local Prototypes */ |
| 56 | |
| 57 | static ACPI_STATUS |
| 58 | AcpiHwReadMultiple ( |
| 59 | UINT32 *Value, |
| 60 | ACPI_GENERIC_ADDRESS *RegisterA, |
| 61 | ACPI_GENERIC_ADDRESS *RegisterB); |
| 62 | |
| 63 | static ACPI_STATUS |
| 64 | AcpiHwWriteMultiple ( |
| 65 | UINT32 Value, |
| 66 | ACPI_GENERIC_ADDRESS *RegisterA, |
| 67 | ACPI_GENERIC_ADDRESS *RegisterB); |
| 68 | |
| 69 | #endif /* !ACPI_REDUCED_HARDWARE */ |
| 70 | |
| 71 | |
| 72 | /****************************************************************************** |
| 73 | * |
| 74 | * FUNCTION: AcpiHwValidateRegister |
| 75 | * |
| 76 | * PARAMETERS: Reg - GAS register structure |
| 77 | * MaxBitWidth - Max BitWidth supported (32 or 64) |
| 78 | * Address - Pointer to where the gas->address |
| 79 | * is returned |
| 80 | * |
| 81 | * RETURN: Status |
| 82 | * |
| 83 | * DESCRIPTION: Validate the contents of a GAS register. Checks the GAS |
| 84 | * pointer, Address, SpaceId, BitWidth, and BitOffset. |
| 85 | * |
| 86 | ******************************************************************************/ |
| 87 | |
| 88 | ACPI_STATUS |
| 89 | AcpiHwValidateRegister ( |
| 90 | ACPI_GENERIC_ADDRESS *Reg, |
| 91 | UINT8 MaxBitWidth, |
| 92 | UINT64 *Address) |
| 93 | { |
| 94 | |
| 95 | /* Must have a valid pointer to a GAS structure */ |
| 96 | |
| 97 | if (!Reg) |
| 98 | { |
| 99 | return (AE_BAD_PARAMETER); |
| 100 | } |
| 101 | |
| 102 | /* |
| 103 | * Copy the target address. This handles possible alignment issues. |
| 104 | * Address must not be null. A null address also indicates an optional |
| 105 | * ACPI register that is not supported, so no error message. |
| 106 | */ |
| 107 | ACPI_MOVE_64_TO_64 (Address, &Reg->Address); |
| 108 | if (!(*Address)) |
| 109 | { |
| 110 | return (AE_BAD_ADDRESS); |
| 111 | } |
| 112 | |
| 113 | /* Validate the SpaceID */ |
| 114 | |
| 115 | if ((Reg->SpaceId != ACPI_ADR_SPACE_SYSTEM_MEMORY) && |
| 116 | (Reg->SpaceId != ACPI_ADR_SPACE_SYSTEM_IO)) |
| 117 | { |
| 118 | ACPI_ERROR ((AE_INFO, |
| 119 | "Unsupported address space: 0x%X" , Reg->SpaceId)); |
| 120 | return (AE_SUPPORT); |
| 121 | } |
| 122 | |
| 123 | /* Validate the BitWidth */ |
| 124 | |
| 125 | if ((Reg->BitWidth != 8) && |
| 126 | (Reg->BitWidth != 16) && |
| 127 | (Reg->BitWidth != 32) && |
| 128 | (Reg->BitWidth != MaxBitWidth)) |
| 129 | { |
| 130 | ACPI_ERROR ((AE_INFO, |
| 131 | "Unsupported register bit width: 0x%X" , Reg->BitWidth)); |
| 132 | return (AE_SUPPORT); |
| 133 | } |
| 134 | |
| 135 | /* Validate the BitOffset. Just a warning for now. */ |
| 136 | |
| 137 | if (Reg->BitOffset != 0) |
| 138 | { |
| 139 | ACPI_WARNING ((AE_INFO, |
| 140 | "Unsupported register bit offset: 0x%X" , Reg->BitOffset)); |
| 141 | } |
| 142 | |
| 143 | return (AE_OK); |
| 144 | } |
| 145 | |
| 146 | |
| 147 | /****************************************************************************** |
| 148 | * |
| 149 | * FUNCTION: AcpiHwRead |
| 150 | * |
| 151 | * PARAMETERS: Value - Where the value is returned |
| 152 | * Reg - GAS register structure |
| 153 | * |
| 154 | * RETURN: Status |
| 155 | * |
| 156 | * DESCRIPTION: Read from either memory or IO space. This is a 32-bit max |
| 157 | * version of AcpiRead, used internally since the overhead of |
| 158 | * 64-bit values is not needed. |
| 159 | * |
| 160 | * LIMITATIONS: <These limitations also apply to AcpiHwWrite> |
| 161 | * BitWidth must be exactly 8, 16, or 32. |
| 162 | * SpaceID must be SystemMemory or SystemIO. |
| 163 | * BitOffset and AccessWidth are currently ignored, as there has |
| 164 | * not been a need to implement these. |
| 165 | * |
| 166 | ******************************************************************************/ |
| 167 | |
| 168 | ACPI_STATUS |
| 169 | AcpiHwRead ( |
| 170 | UINT32 *Value, |
| 171 | ACPI_GENERIC_ADDRESS *Reg) |
| 172 | { |
| 173 | UINT64 Address; |
| 174 | UINT64 Value64; |
| 175 | ACPI_STATUS Status; |
| 176 | |
| 177 | |
| 178 | ACPI_FUNCTION_NAME (HwRead); |
| 179 | |
| 180 | |
| 181 | /* Validate contents of the GAS register */ |
| 182 | |
| 183 | Status = AcpiHwValidateRegister (Reg, 32, &Address); |
| 184 | if (ACPI_FAILURE (Status)) |
| 185 | { |
| 186 | return (Status); |
| 187 | } |
| 188 | |
| 189 | /* Initialize entire 32-bit return value to zero */ |
| 190 | |
| 191 | *Value = 0; |
| 192 | |
| 193 | /* |
| 194 | * Two address spaces supported: Memory or IO. PCI_Config is |
| 195 | * not supported here because the GAS structure is insufficient |
| 196 | */ |
| 197 | if (Reg->SpaceId == ACPI_ADR_SPACE_SYSTEM_MEMORY) |
| 198 | { |
| 199 | Status = AcpiOsReadMemory ((ACPI_PHYSICAL_ADDRESS) |
| 200 | Address, &Value64, Reg->BitWidth); |
| 201 | |
| 202 | *Value = (UINT32) Value64; |
| 203 | } |
| 204 | else /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */ |
| 205 | { |
| 206 | Status = AcpiHwReadPort ((ACPI_IO_ADDRESS) |
| 207 | Address, Value, Reg->BitWidth); |
| 208 | } |
| 209 | |
| 210 | ACPI_DEBUG_PRINT ((ACPI_DB_IO, |
| 211 | "Read: %8.8X width %2d from %8.8X%8.8X (%s)\n" , |
| 212 | *Value, Reg->BitWidth, ACPI_FORMAT_UINT64 (Address), |
| 213 | AcpiUtGetRegionName (Reg->SpaceId))); |
| 214 | |
| 215 | return (Status); |
| 216 | } |
| 217 | |
| 218 | |
| 219 | /****************************************************************************** |
| 220 | * |
| 221 | * FUNCTION: AcpiHwWrite |
| 222 | * |
| 223 | * PARAMETERS: Value - Value to be written |
| 224 | * Reg - GAS register structure |
| 225 | * |
| 226 | * RETURN: Status |
| 227 | * |
| 228 | * DESCRIPTION: Write to either memory or IO space. This is a 32-bit max |
| 229 | * version of AcpiWrite, used internally since the overhead of |
| 230 | * 64-bit values is not needed. |
| 231 | * |
| 232 | ******************************************************************************/ |
| 233 | |
| 234 | ACPI_STATUS |
| 235 | AcpiHwWrite ( |
| 236 | UINT32 Value, |
| 237 | ACPI_GENERIC_ADDRESS *Reg) |
| 238 | { |
| 239 | UINT64 Address; |
| 240 | ACPI_STATUS Status; |
| 241 | |
| 242 | |
| 243 | ACPI_FUNCTION_NAME (HwWrite); |
| 244 | |
| 245 | |
| 246 | /* Validate contents of the GAS register */ |
| 247 | |
| 248 | Status = AcpiHwValidateRegister (Reg, 32, &Address); |
| 249 | if (ACPI_FAILURE (Status)) |
| 250 | { |
| 251 | return (Status); |
| 252 | } |
| 253 | |
| 254 | /* |
| 255 | * Two address spaces supported: Memory or IO. PCI_Config is |
| 256 | * not supported here because the GAS structure is insufficient |
| 257 | */ |
| 258 | if (Reg->SpaceId == ACPI_ADR_SPACE_SYSTEM_MEMORY) |
| 259 | { |
| 260 | Status = AcpiOsWriteMemory ((ACPI_PHYSICAL_ADDRESS) |
| 261 | Address, (UINT64) Value, Reg->BitWidth); |
| 262 | } |
| 263 | else /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */ |
| 264 | { |
| 265 | Status = AcpiHwWritePort ((ACPI_IO_ADDRESS) |
| 266 | Address, Value, Reg->BitWidth); |
| 267 | } |
| 268 | |
| 269 | ACPI_DEBUG_PRINT ((ACPI_DB_IO, |
| 270 | "Wrote: %8.8X width %2d to %8.8X%8.8X (%s)\n" , |
| 271 | Value, Reg->BitWidth, ACPI_FORMAT_UINT64 (Address), |
| 272 | AcpiUtGetRegionName (Reg->SpaceId))); |
| 273 | |
| 274 | return (Status); |
| 275 | } |
| 276 | |
| 277 | |
| 278 | #if (!ACPI_REDUCED_HARDWARE) |
| 279 | /******************************************************************************* |
| 280 | * |
| 281 | * FUNCTION: AcpiHwClearAcpiStatus |
| 282 | * |
| 283 | * PARAMETERS: None |
| 284 | * |
| 285 | * RETURN: Status |
| 286 | * |
| 287 | * DESCRIPTION: Clears all fixed and general purpose status bits |
| 288 | * |
| 289 | ******************************************************************************/ |
| 290 | |
| 291 | ACPI_STATUS |
| 292 | AcpiHwClearAcpiStatus ( |
| 293 | void) |
| 294 | { |
| 295 | ACPI_STATUS Status; |
| 296 | ACPI_CPU_FLAGS LockFlags = 0; |
| 297 | |
| 298 | |
| 299 | ACPI_FUNCTION_TRACE (HwClearAcpiStatus); |
| 300 | |
| 301 | |
| 302 | ACPI_DEBUG_PRINT ((ACPI_DB_IO, "About to write %04X to %8.8X%8.8X\n" , |
| 303 | ACPI_BITMASK_ALL_FIXED_STATUS, |
| 304 | ACPI_FORMAT_UINT64 (AcpiGbl_XPm1aStatus.Address))); |
| 305 | |
| 306 | LockFlags = AcpiOsAcquireLock (AcpiGbl_HardwareLock); |
| 307 | |
| 308 | /* Clear the fixed events in PM1 A/B */ |
| 309 | |
| 310 | Status = AcpiHwRegisterWrite (ACPI_REGISTER_PM1_STATUS, |
| 311 | ACPI_BITMASK_ALL_FIXED_STATUS); |
| 312 | |
| 313 | AcpiOsReleaseLock (AcpiGbl_HardwareLock, LockFlags); |
| 314 | |
| 315 | if (ACPI_FAILURE (Status)) |
| 316 | { |
| 317 | goto Exit; |
| 318 | } |
| 319 | |
| 320 | /* Clear the GPE Bits in all GPE registers in all GPE blocks */ |
| 321 | |
| 322 | Status = AcpiEvWalkGpeList (AcpiHwClearGpeBlock, NULL); |
| 323 | |
| 324 | Exit: |
| 325 | return_ACPI_STATUS (Status); |
| 326 | } |
| 327 | |
| 328 | |
| 329 | /******************************************************************************* |
| 330 | * |
| 331 | * FUNCTION: AcpiHwGetBitRegisterInfo |
| 332 | * |
| 333 | * PARAMETERS: RegisterId - Index of ACPI Register to access |
| 334 | * |
| 335 | * RETURN: The bitmask to be used when accessing the register |
| 336 | * |
| 337 | * DESCRIPTION: Map RegisterId into a register bitmask. |
| 338 | * |
| 339 | ******************************************************************************/ |
| 340 | |
| 341 | ACPI_BIT_REGISTER_INFO * |
| 342 | AcpiHwGetBitRegisterInfo ( |
| 343 | UINT32 RegisterId) |
| 344 | { |
| 345 | ACPI_FUNCTION_ENTRY (); |
| 346 | |
| 347 | |
| 348 | if (RegisterId > ACPI_BITREG_MAX) |
| 349 | { |
| 350 | ACPI_ERROR ((AE_INFO, "Invalid BitRegister ID: 0x%X" , RegisterId)); |
| 351 | return (NULL); |
| 352 | } |
| 353 | |
| 354 | return (&AcpiGbl_BitRegisterInfo[RegisterId]); |
| 355 | } |
| 356 | |
| 357 | |
| 358 | /****************************************************************************** |
| 359 | * |
| 360 | * FUNCTION: AcpiHwWritePm1Control |
| 361 | * |
| 362 | * PARAMETERS: Pm1aControl - Value to be written to PM1A control |
| 363 | * Pm1bControl - Value to be written to PM1B control |
| 364 | * |
| 365 | * RETURN: Status |
| 366 | * |
| 367 | * DESCRIPTION: Write the PM1 A/B control registers. These registers are |
| 368 | * different than than the PM1 A/B status and enable registers |
| 369 | * in that different values can be written to the A/B registers. |
| 370 | * Most notably, the SLP_TYP bits can be different, as per the |
| 371 | * values returned from the _Sx predefined methods. |
| 372 | * |
| 373 | ******************************************************************************/ |
| 374 | |
| 375 | ACPI_STATUS |
| 376 | AcpiHwWritePm1Control ( |
| 377 | UINT32 Pm1aControl, |
| 378 | UINT32 Pm1bControl) |
| 379 | { |
| 380 | ACPI_STATUS Status; |
| 381 | |
| 382 | |
| 383 | ACPI_FUNCTION_TRACE (HwWritePm1Control); |
| 384 | |
| 385 | |
| 386 | Status = AcpiHwWrite (Pm1aControl, &AcpiGbl_FADT.XPm1aControlBlock); |
| 387 | if (ACPI_FAILURE (Status)) |
| 388 | { |
| 389 | return_ACPI_STATUS (Status); |
| 390 | } |
| 391 | |
| 392 | if (AcpiGbl_FADT.XPm1bControlBlock.Address) |
| 393 | { |
| 394 | Status = AcpiHwWrite (Pm1bControl, &AcpiGbl_FADT.XPm1bControlBlock); |
| 395 | } |
| 396 | return_ACPI_STATUS (Status); |
| 397 | } |
| 398 | |
| 399 | |
| 400 | /****************************************************************************** |
| 401 | * |
| 402 | * FUNCTION: AcpiHwRegisterRead |
| 403 | * |
| 404 | * PARAMETERS: RegisterId - ACPI Register ID |
| 405 | * ReturnValue - Where the register value is returned |
| 406 | * |
| 407 | * RETURN: Status and the value read. |
| 408 | * |
| 409 | * DESCRIPTION: Read from the specified ACPI register |
| 410 | * |
| 411 | ******************************************************************************/ |
| 412 | |
| 413 | ACPI_STATUS |
| 414 | AcpiHwRegisterRead ( |
| 415 | UINT32 RegisterId, |
| 416 | UINT32 *ReturnValue) |
| 417 | { |
| 418 | UINT32 Value = 0; |
| 419 | ACPI_STATUS Status; |
| 420 | |
| 421 | |
| 422 | ACPI_FUNCTION_TRACE (HwRegisterRead); |
| 423 | |
| 424 | |
| 425 | switch (RegisterId) |
| 426 | { |
| 427 | case ACPI_REGISTER_PM1_STATUS: /* PM1 A/B: 16-bit access each */ |
| 428 | |
| 429 | Status = AcpiHwReadMultiple (&Value, |
| 430 | &AcpiGbl_XPm1aStatus, |
| 431 | &AcpiGbl_XPm1bStatus); |
| 432 | break; |
| 433 | |
| 434 | case ACPI_REGISTER_PM1_ENABLE: /* PM1 A/B: 16-bit access each */ |
| 435 | |
| 436 | Status = AcpiHwReadMultiple (&Value, |
| 437 | &AcpiGbl_XPm1aEnable, |
| 438 | &AcpiGbl_XPm1bEnable); |
| 439 | break; |
| 440 | |
| 441 | case ACPI_REGISTER_PM1_CONTROL: /* PM1 A/B: 16-bit access each */ |
| 442 | |
| 443 | Status = AcpiHwReadMultiple (&Value, |
| 444 | &AcpiGbl_FADT.XPm1aControlBlock, |
| 445 | &AcpiGbl_FADT.XPm1bControlBlock); |
| 446 | |
| 447 | /* |
| 448 | * Zero the write-only bits. From the ACPI specification, "Hardware |
| 449 | * Write-Only Bits": "Upon reads to registers with write-only bits, |
| 450 | * software masks out all write-only bits." |
| 451 | */ |
| 452 | Value &= ~ACPI_PM1_CONTROL_WRITEONLY_BITS; |
| 453 | break; |
| 454 | |
| 455 | case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */ |
| 456 | |
| 457 | Status = AcpiHwRead (&Value, &AcpiGbl_FADT.XPm2ControlBlock); |
| 458 | break; |
| 459 | |
| 460 | case ACPI_REGISTER_PM_TIMER: /* 32-bit access */ |
| 461 | |
| 462 | Status = AcpiHwRead (&Value, &AcpiGbl_FADT.XPmTimerBlock); |
| 463 | break; |
| 464 | |
| 465 | case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */ |
| 466 | |
| 467 | Status = AcpiHwReadPort (AcpiGbl_FADT.SmiCommand, &Value, 8); |
| 468 | break; |
| 469 | |
| 470 | default: |
| 471 | |
| 472 | ACPI_ERROR ((AE_INFO, "Unknown Register ID: 0x%X" , |
| 473 | RegisterId)); |
| 474 | Status = AE_BAD_PARAMETER; |
| 475 | break; |
| 476 | } |
| 477 | |
| 478 | if (ACPI_SUCCESS (Status)) |
| 479 | { |
| 480 | *ReturnValue = Value; |
| 481 | } |
| 482 | |
| 483 | return_ACPI_STATUS (Status); |
| 484 | } |
| 485 | |
| 486 | |
| 487 | /****************************************************************************** |
| 488 | * |
| 489 | * FUNCTION: AcpiHwRegisterWrite |
| 490 | * |
| 491 | * PARAMETERS: RegisterId - ACPI Register ID |
| 492 | * Value - The value to write |
| 493 | * |
| 494 | * RETURN: Status |
| 495 | * |
| 496 | * DESCRIPTION: Write to the specified ACPI register |
| 497 | * |
| 498 | * NOTE: In accordance with the ACPI specification, this function automatically |
| 499 | * preserves the value of the following bits, meaning that these bits cannot be |
| 500 | * changed via this interface: |
| 501 | * |
| 502 | * PM1_CONTROL[0] = SCI_EN |
| 503 | * PM1_CONTROL[9] |
| 504 | * PM1_STATUS[11] |
| 505 | * |
| 506 | * ACPI References: |
| 507 | * 1) Hardware Ignored Bits: When software writes to a register with ignored |
| 508 | * bit fields, it preserves the ignored bit fields |
| 509 | * 2) SCI_EN: OSPM always preserves this bit position |
| 510 | * |
| 511 | ******************************************************************************/ |
| 512 | |
| 513 | ACPI_STATUS |
| 514 | AcpiHwRegisterWrite ( |
| 515 | UINT32 RegisterId, |
| 516 | UINT32 Value) |
| 517 | { |
| 518 | ACPI_STATUS Status; |
| 519 | UINT32 ReadValue; |
| 520 | |
| 521 | |
| 522 | ACPI_FUNCTION_TRACE (HwRegisterWrite); |
| 523 | |
| 524 | |
| 525 | switch (RegisterId) |
| 526 | { |
| 527 | case ACPI_REGISTER_PM1_STATUS: /* PM1 A/B: 16-bit access each */ |
| 528 | /* |
| 529 | * Handle the "ignored" bit in PM1 Status. According to the ACPI |
| 530 | * specification, ignored bits are to be preserved when writing. |
| 531 | * Normally, this would mean a read/modify/write sequence. However, |
| 532 | * preserving a bit in the status register is different. Writing a |
| 533 | * one clears the status, and writing a zero preserves the status. |
| 534 | * Therefore, we must always write zero to the ignored bit. |
| 535 | * |
| 536 | * This behavior is clarified in the ACPI 4.0 specification. |
| 537 | */ |
| 538 | Value &= ~ACPI_PM1_STATUS_PRESERVED_BITS; |
| 539 | |
| 540 | Status = AcpiHwWriteMultiple (Value, |
| 541 | &AcpiGbl_XPm1aStatus, |
| 542 | &AcpiGbl_XPm1bStatus); |
| 543 | break; |
| 544 | |
| 545 | case ACPI_REGISTER_PM1_ENABLE: /* PM1 A/B: 16-bit access each */ |
| 546 | |
| 547 | Status = AcpiHwWriteMultiple (Value, |
| 548 | &AcpiGbl_XPm1aEnable, |
| 549 | &AcpiGbl_XPm1bEnable); |
| 550 | break; |
| 551 | |
| 552 | case ACPI_REGISTER_PM1_CONTROL: /* PM1 A/B: 16-bit access each */ |
| 553 | /* |
| 554 | * Perform a read first to preserve certain bits (per ACPI spec) |
| 555 | * Note: This includes SCI_EN, we never want to change this bit |
| 556 | */ |
| 557 | Status = AcpiHwReadMultiple (&ReadValue, |
| 558 | &AcpiGbl_FADT.XPm1aControlBlock, |
| 559 | &AcpiGbl_FADT.XPm1bControlBlock); |
| 560 | if (ACPI_FAILURE (Status)) |
| 561 | { |
| 562 | goto Exit; |
| 563 | } |
| 564 | |
| 565 | /* Insert the bits to be preserved */ |
| 566 | |
| 567 | ACPI_INSERT_BITS (Value, ACPI_PM1_CONTROL_PRESERVED_BITS, ReadValue); |
| 568 | |
| 569 | /* Now we can write the data */ |
| 570 | |
| 571 | Status = AcpiHwWriteMultiple (Value, |
| 572 | &AcpiGbl_FADT.XPm1aControlBlock, |
| 573 | &AcpiGbl_FADT.XPm1bControlBlock); |
| 574 | break; |
| 575 | |
| 576 | case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */ |
| 577 | /* |
| 578 | * For control registers, all reserved bits must be preserved, |
| 579 | * as per the ACPI spec. |
| 580 | */ |
| 581 | Status = AcpiHwRead (&ReadValue, &AcpiGbl_FADT.XPm2ControlBlock); |
| 582 | if (ACPI_FAILURE (Status)) |
| 583 | { |
| 584 | goto Exit; |
| 585 | } |
| 586 | |
| 587 | /* Insert the bits to be preserved */ |
| 588 | |
| 589 | ACPI_INSERT_BITS (Value, ACPI_PM2_CONTROL_PRESERVED_BITS, ReadValue); |
| 590 | |
| 591 | Status = AcpiHwWrite (Value, &AcpiGbl_FADT.XPm2ControlBlock); |
| 592 | break; |
| 593 | |
| 594 | case ACPI_REGISTER_PM_TIMER: /* 32-bit access */ |
| 595 | |
| 596 | Status = AcpiHwWrite (Value, &AcpiGbl_FADT.XPmTimerBlock); |
| 597 | break; |
| 598 | |
| 599 | case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */ |
| 600 | |
| 601 | /* SMI_CMD is currently always in IO space */ |
| 602 | |
| 603 | Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand, Value, 8); |
| 604 | break; |
| 605 | |
| 606 | default: |
| 607 | |
| 608 | ACPI_ERROR ((AE_INFO, "Unknown Register ID: 0x%X" , |
| 609 | RegisterId)); |
| 610 | Status = AE_BAD_PARAMETER; |
| 611 | break; |
| 612 | } |
| 613 | |
| 614 | Exit: |
| 615 | return_ACPI_STATUS (Status); |
| 616 | } |
| 617 | |
| 618 | |
| 619 | /****************************************************************************** |
| 620 | * |
| 621 | * FUNCTION: AcpiHwReadMultiple |
| 622 | * |
| 623 | * PARAMETERS: Value - Where the register value is returned |
| 624 | * RegisterA - First ACPI register (required) |
| 625 | * RegisterB - Second ACPI register (optional) |
| 626 | * |
| 627 | * RETURN: Status |
| 628 | * |
| 629 | * DESCRIPTION: Read from the specified two-part ACPI register (such as PM1 A/B) |
| 630 | * |
| 631 | ******************************************************************************/ |
| 632 | |
| 633 | static ACPI_STATUS |
| 634 | AcpiHwReadMultiple ( |
| 635 | UINT32 *Value, |
| 636 | ACPI_GENERIC_ADDRESS *RegisterA, |
| 637 | ACPI_GENERIC_ADDRESS *RegisterB) |
| 638 | { |
| 639 | UINT32 ValueA = 0; |
| 640 | UINT32 ValueB = 0; |
| 641 | ACPI_STATUS Status; |
| 642 | |
| 643 | |
| 644 | /* The first register is always required */ |
| 645 | |
| 646 | Status = AcpiHwRead (&ValueA, RegisterA); |
| 647 | if (ACPI_FAILURE (Status)) |
| 648 | { |
| 649 | return (Status); |
| 650 | } |
| 651 | |
| 652 | /* Second register is optional */ |
| 653 | |
| 654 | if (RegisterB->Address) |
| 655 | { |
| 656 | Status = AcpiHwRead (&ValueB, RegisterB); |
| 657 | if (ACPI_FAILURE (Status)) |
| 658 | { |
| 659 | return (Status); |
| 660 | } |
| 661 | } |
| 662 | |
| 663 | /* |
| 664 | * OR the two return values together. No shifting or masking is necessary, |
| 665 | * because of how the PM1 registers are defined in the ACPI specification: |
| 666 | * |
| 667 | * "Although the bits can be split between the two register blocks (each |
| 668 | * register block has a unique pointer within the FADT), the bit positions |
| 669 | * are maintained. The register block with unimplemented bits (that is, |
| 670 | * those implemented in the other register block) always returns zeros, |
| 671 | * and writes have no side effects" |
| 672 | */ |
| 673 | *Value = (ValueA | ValueB); |
| 674 | return (AE_OK); |
| 675 | } |
| 676 | |
| 677 | |
| 678 | /****************************************************************************** |
| 679 | * |
| 680 | * FUNCTION: AcpiHwWriteMultiple |
| 681 | * |
| 682 | * PARAMETERS: Value - The value to write |
| 683 | * RegisterA - First ACPI register (required) |
| 684 | * RegisterB - Second ACPI register (optional) |
| 685 | * |
| 686 | * RETURN: Status |
| 687 | * |
| 688 | * DESCRIPTION: Write to the specified two-part ACPI register (such as PM1 A/B) |
| 689 | * |
| 690 | ******************************************************************************/ |
| 691 | |
| 692 | static ACPI_STATUS |
| 693 | AcpiHwWriteMultiple ( |
| 694 | UINT32 Value, |
| 695 | ACPI_GENERIC_ADDRESS *RegisterA, |
| 696 | ACPI_GENERIC_ADDRESS *RegisterB) |
| 697 | { |
| 698 | ACPI_STATUS Status; |
| 699 | |
| 700 | |
| 701 | /* The first register is always required */ |
| 702 | |
| 703 | Status = AcpiHwWrite (Value, RegisterA); |
| 704 | if (ACPI_FAILURE (Status)) |
| 705 | { |
| 706 | return (Status); |
| 707 | } |
| 708 | |
| 709 | /* |
| 710 | * Second register is optional |
| 711 | * |
| 712 | * No bit shifting or clearing is necessary, because of how the PM1 |
| 713 | * registers are defined in the ACPI specification: |
| 714 | * |
| 715 | * "Although the bits can be split between the two register blocks (each |
| 716 | * register block has a unique pointer within the FADT), the bit positions |
| 717 | * are maintained. The register block with unimplemented bits (that is, |
| 718 | * those implemented in the other register block) always returns zeros, |
| 719 | * and writes have no side effects" |
| 720 | */ |
| 721 | if (RegisterB->Address) |
| 722 | { |
| 723 | Status = AcpiHwWrite (Value, RegisterB); |
| 724 | } |
| 725 | |
| 726 | return (Status); |
| 727 | } |
| 728 | |
| 729 | #endif /* !ACPI_REDUCED_HARDWARE */ |
| 730 | |