1/****************************************************************************** 2 * 3 * Module Name: hwxface - Public ACPICA hardware interfaces 4 * 5 *****************************************************************************/ 6 7/* 8 * Copyright (C) 2000 - 2015, 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#define EXPORT_ACPI_INTERFACES 45 46#include <acpi/acpi.h> 47#include "accommon.h" 48#include "acnamesp.h" 49 50#define _COMPONENT ACPI_HARDWARE 51ACPI_MODULE_NAME("hwxface") 52 53/****************************************************************************** 54 * 55 * FUNCTION: acpi_reset 56 * 57 * PARAMETERS: None 58 * 59 * RETURN: Status 60 * 61 * DESCRIPTION: Set reset register in memory or IO space. Note: Does not 62 * support reset register in PCI config space, this must be 63 * handled separately. 64 * 65 ******************************************************************************/ 66acpi_status acpi_reset(void) 67{ 68 struct acpi_generic_address *reset_reg; 69 acpi_status status; 70 71 ACPI_FUNCTION_TRACE(acpi_reset); 72 73 reset_reg = &acpi_gbl_FADT.reset_register; 74 75 /* Check if the reset register is supported */ 76 77 if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) || 78 !reset_reg->address) { 79 return_ACPI_STATUS(AE_NOT_EXIST); 80 } 81 82 if (reset_reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) { 83 /* 84 * For I/O space, write directly to the OSL. This bypasses the port 85 * validation mechanism, which may block a valid write to the reset 86 * register. 87 * 88 * NOTE: 89 * The ACPI spec requires the reset register width to be 8, so we 90 * hardcode it here and ignore the FADT value. This maintains 91 * compatibility with other ACPI implementations that have allowed 92 * BIOS code with bad register width values to go unnoticed. 93 */ 94 status = 95 acpi_os_write_port((acpi_io_address) reset_reg->address, 96 acpi_gbl_FADT.reset_value, 97 ACPI_RESET_REGISTER_WIDTH); 98 } else { 99 /* Write the reset value to the reset register */ 100 101 status = acpi_hw_write(acpi_gbl_FADT.reset_value, reset_reg); 102 } 103 104 return_ACPI_STATUS(status); 105} 106 107ACPI_EXPORT_SYMBOL(acpi_reset) 108 109/****************************************************************************** 110 * 111 * FUNCTION: acpi_read 112 * 113 * PARAMETERS: value - Where the value is returned 114 * reg - GAS register structure 115 * 116 * RETURN: Status 117 * 118 * DESCRIPTION: Read from either memory or IO space. 119 * 120 * LIMITATIONS: <These limitations also apply to acpi_write> 121 * bit_width must be exactly 8, 16, 32, or 64. 122 * space_ID must be system_memory or system_IO. 123 * bit_offset and access_width are currently ignored, as there has 124 * not been a need to implement these. 125 * 126 ******************************************************************************/ 127acpi_status acpi_read(u64 *return_value, struct acpi_generic_address *reg) 128{ 129 u32 value_lo; 130 u32 value_hi; 131 u32 width; 132 u64 address; 133 acpi_status status; 134 135 ACPI_FUNCTION_NAME(acpi_read); 136 137 if (!return_value) { 138 return (AE_BAD_PARAMETER); 139 } 140 141 /* Validate contents of the GAS register. Allow 64-bit transfers */ 142 143 status = acpi_hw_validate_register(reg, 64, &address); 144 if (ACPI_FAILURE(status)) { 145 return (status); 146 } 147 148 /* 149 * Two address spaces supported: Memory or I/O. PCI_Config is 150 * not supported here because the GAS structure is insufficient 151 */ 152 if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { 153 status = acpi_os_read_memory((acpi_physical_address) 154 address, return_value, 155 reg->bit_width); 156 if (ACPI_FAILURE(status)) { 157 return (status); 158 } 159 } else { /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */ 160 161 value_lo = 0; 162 value_hi = 0; 163 164 width = reg->bit_width; 165 if (width == 64) { 166 width = 32; /* Break into two 32-bit transfers */ 167 } 168 169 status = acpi_hw_read_port((acpi_io_address) 170 address, &value_lo, width); 171 if (ACPI_FAILURE(status)) { 172 return (status); 173 } 174 175 if (reg->bit_width == 64) { 176 177 /* Read the top 32 bits */ 178 179 status = acpi_hw_read_port((acpi_io_address) 180 (address + 4), &value_hi, 181 32); 182 if (ACPI_FAILURE(status)) { 183 return (status); 184 } 185 } 186 187 /* Set the return value only if status is AE_OK */ 188 189 *return_value = (value_lo | ((u64)value_hi << 32)); 190 } 191 192 ACPI_DEBUG_PRINT((ACPI_DB_IO, 193 "Read: %8.8X%8.8X width %2d from %8.8X%8.8X (%s)\n", 194 ACPI_FORMAT_UINT64(*return_value), reg->bit_width, 195 ACPI_FORMAT_UINT64(address), 196 acpi_ut_get_region_name(reg->space_id))); 197 198 return (AE_OK); 199} 200 201ACPI_EXPORT_SYMBOL(acpi_read) 202 203/****************************************************************************** 204 * 205 * FUNCTION: acpi_write 206 * 207 * PARAMETERS: value - Value to be written 208 * reg - GAS register structure 209 * 210 * RETURN: Status 211 * 212 * DESCRIPTION: Write to either memory or IO space. 213 * 214 ******************************************************************************/ 215acpi_status acpi_write(u64 value, struct acpi_generic_address *reg) 216{ 217 u32 width; 218 u64 address; 219 acpi_status status; 220 221 ACPI_FUNCTION_NAME(acpi_write); 222 223 /* Validate contents of the GAS register. Allow 64-bit transfers */ 224 225 status = acpi_hw_validate_register(reg, 64, &address); 226 if (ACPI_FAILURE(status)) { 227 return (status); 228 } 229 230 /* 231 * Two address spaces supported: Memory or IO. PCI_Config is 232 * not supported here because the GAS structure is insufficient 233 */ 234 if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { 235 status = acpi_os_write_memory((acpi_physical_address) 236 address, value, reg->bit_width); 237 if (ACPI_FAILURE(status)) { 238 return (status); 239 } 240 } else { /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */ 241 242 width = reg->bit_width; 243 if (width == 64) { 244 width = 32; /* Break into two 32-bit transfers */ 245 } 246 247 status = acpi_hw_write_port((acpi_io_address) 248 address, ACPI_LODWORD(value), 249 width); 250 if (ACPI_FAILURE(status)) { 251 return (status); 252 } 253 254 if (reg->bit_width == 64) { 255 status = acpi_hw_write_port((acpi_io_address) 256 (address + 4), 257 ACPI_HIDWORD(value), 32); 258 if (ACPI_FAILURE(status)) { 259 return (status); 260 } 261 } 262 } 263 264 ACPI_DEBUG_PRINT((ACPI_DB_IO, 265 "Wrote: %8.8X%8.8X width %2d to %8.8X%8.8X (%s)\n", 266 ACPI_FORMAT_UINT64(value), reg->bit_width, 267 ACPI_FORMAT_UINT64(address), 268 acpi_ut_get_region_name(reg->space_id))); 269 270 return (status); 271} 272 273ACPI_EXPORT_SYMBOL(acpi_write) 274 275#if (!ACPI_REDUCED_HARDWARE) 276/******************************************************************************* 277 * 278 * FUNCTION: acpi_read_bit_register 279 * 280 * PARAMETERS: register_id - ID of ACPI Bit Register to access 281 * return_value - Value that was read from the register, 282 * normalized to bit position zero. 283 * 284 * RETURN: Status and the value read from the specified Register. Value 285 * returned is normalized to bit0 (is shifted all the way right) 286 * 287 * DESCRIPTION: ACPI bit_register read function. Does not acquire the HW lock. 288 * 289 * SUPPORTS: Bit fields in PM1 Status, PM1 Enable, PM1 Control, and 290 * PM2 Control. 291 * 292 * Note: The hardware lock is not required when reading the ACPI bit registers 293 * since almost all of them are single bit and it does not matter that 294 * the parent hardware register can be split across two physical 295 * registers. The only multi-bit field is SLP_TYP in the PM1 control 296 * register, but this field does not cross an 8-bit boundary (nor does 297 * it make much sense to actually read this field.) 298 * 299 ******************************************************************************/ 300acpi_status acpi_read_bit_register(u32 register_id, u32 *return_value) 301{ 302 struct acpi_bit_register_info *bit_reg_info; 303 u32 register_value; 304 u32 value; 305 acpi_status status; 306 307 ACPI_FUNCTION_TRACE_U32(acpi_read_bit_register, register_id); 308 309 /* Get the info structure corresponding to the requested ACPI Register */ 310 311 bit_reg_info = acpi_hw_get_bit_register_info(register_id); 312 if (!bit_reg_info) { 313 return_ACPI_STATUS(AE_BAD_PARAMETER); 314 } 315 316 /* Read the entire parent register */ 317 318 status = acpi_hw_register_read(bit_reg_info->parent_register, 319 ®ister_value); 320 if (ACPI_FAILURE(status)) { 321 return_ACPI_STATUS(status); 322 } 323 324 /* Normalize the value that was read, mask off other bits */ 325 326 value = ((register_value & bit_reg_info->access_bit_mask) 327 >> bit_reg_info->bit_position); 328 329 ACPI_DEBUG_PRINT((ACPI_DB_IO, 330 "BitReg %X, ParentReg %X, Actual %8.8X, ReturnValue %8.8X\n", 331 register_id, bit_reg_info->parent_register, 332 register_value, value)); 333 334 *return_value = value; 335 return_ACPI_STATUS(AE_OK); 336} 337 338ACPI_EXPORT_SYMBOL(acpi_read_bit_register) 339 340/******************************************************************************* 341 * 342 * FUNCTION: acpi_write_bit_register 343 * 344 * PARAMETERS: register_id - ID of ACPI Bit Register to access 345 * value - Value to write to the register, in bit 346 * position zero. The bit is automatically 347 * shifted to the correct position. 348 * 349 * RETURN: Status 350 * 351 * DESCRIPTION: ACPI Bit Register write function. Acquires the hardware lock 352 * since most operations require a read/modify/write sequence. 353 * 354 * SUPPORTS: Bit fields in PM1 Status, PM1 Enable, PM1 Control, and 355 * PM2 Control. 356 * 357 * Note that at this level, the fact that there may be actually two 358 * hardware registers (A and B - and B may not exist) is abstracted. 359 * 360 ******************************************************************************/ 361acpi_status acpi_write_bit_register(u32 register_id, u32 value) 362{ 363 struct acpi_bit_register_info *bit_reg_info; 364 acpi_cpu_flags lock_flags; 365 u32 register_value; 366 acpi_status status = AE_OK; 367 368 ACPI_FUNCTION_TRACE_U32(acpi_write_bit_register, register_id); 369 370 /* Get the info structure corresponding to the requested ACPI Register */ 371 372 bit_reg_info = acpi_hw_get_bit_register_info(register_id); 373 if (!bit_reg_info) { 374 return_ACPI_STATUS(AE_BAD_PARAMETER); 375 } 376 377 lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock); 378 379 /* 380 * At this point, we know that the parent register is one of the 381 * following: PM1 Status, PM1 Enable, PM1 Control, or PM2 Control 382 */ 383 if (bit_reg_info->parent_register != ACPI_REGISTER_PM1_STATUS) { 384 /* 385 * 1) Case for PM1 Enable, PM1 Control, and PM2 Control 386 * 387 * Perform a register read to preserve the bits that we are not 388 * interested in 389 */ 390 status = acpi_hw_register_read(bit_reg_info->parent_register, 391 ®ister_value); 392 if (ACPI_FAILURE(status)) { 393 goto unlock_and_exit; 394 } 395 396 /* 397 * Insert the input bit into the value that was just read 398 * and write the register 399 */ 400 ACPI_REGISTER_INSERT_VALUE(register_value, 401 bit_reg_info->bit_position, 402 bit_reg_info->access_bit_mask, 403 value); 404 405 status = acpi_hw_register_write(bit_reg_info->parent_register, 406 register_value); 407 } else { 408 /* 409 * 2) Case for PM1 Status 410 * 411 * The Status register is different from the rest. Clear an event 412 * by writing 1, writing 0 has no effect. So, the only relevant 413 * information is the single bit we're interested in, all others 414 * should be written as 0 so they will be left unchanged. 415 */ 416 register_value = ACPI_REGISTER_PREPARE_BITS(value, 417 bit_reg_info-> 418 bit_position, 419 bit_reg_info-> 420 access_bit_mask); 421 422 /* No need to write the register if value is all zeros */ 423 424 if (register_value) { 425 status = 426 acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS, 427 register_value); 428 } 429 } 430 431 ACPI_DEBUG_PRINT((ACPI_DB_IO, 432 "BitReg %X, ParentReg %X, Value %8.8X, Actual %8.8X\n", 433 register_id, bit_reg_info->parent_register, value, 434 register_value)); 435 436unlock_and_exit: 437 438 acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags); 439 return_ACPI_STATUS(status); 440} 441 442ACPI_EXPORT_SYMBOL(acpi_write_bit_register) 443#endif /* !ACPI_REDUCED_HARDWARE */ 444/******************************************************************************* 445 * 446 * FUNCTION: acpi_get_sleep_type_data 447 * 448 * PARAMETERS: sleep_state - Numeric sleep state 449 * *sleep_type_a - Where SLP_TYPa is returned 450 * *sleep_type_b - Where SLP_TYPb is returned 451 * 452 * RETURN: Status 453 * 454 * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested 455 * sleep state via the appropriate \_Sx object. 456 * 457 * The sleep state package returned from the corresponding \_Sx_ object 458 * must contain at least one integer. 459 * 460 * March 2005: 461 * Added support for a package that contains two integers. This 462 * goes against the ACPI specification which defines this object as a 463 * package with one encoded DWORD integer. However, existing practice 464 * by many BIOS vendors is to return a package with 2 or more integer 465 * elements, at least one per sleep type (A/B). 466 * 467 * January 2013: 468 * Therefore, we must be prepared to accept a package with either a 469 * single integer or multiple integers. 470 * 471 * The single integer DWORD format is as follows: 472 * BYTE 0 - Value for the PM1A SLP_TYP register 473 * BYTE 1 - Value for the PM1B SLP_TYP register 474 * BYTE 2-3 - Reserved 475 * 476 * The dual integer format is as follows: 477 * Integer 0 - Value for the PM1A SLP_TYP register 478 * Integer 1 - Value for the PM1A SLP_TYP register 479 * 480 ******************************************************************************/ 481acpi_status 482acpi_get_sleep_type_data(u8 sleep_state, u8 *sleep_type_a, u8 *sleep_type_b) 483{ 484 acpi_status status; 485 struct acpi_evaluate_info *info; 486 union acpi_operand_object **elements; 487 488 ACPI_FUNCTION_TRACE(acpi_get_sleep_type_data); 489 490 /* Validate parameters */ 491 492 if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) { 493 return_ACPI_STATUS(AE_BAD_PARAMETER); 494 } 495 496 /* Allocate the evaluation information block */ 497 498 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); 499 if (!info) { 500 return_ACPI_STATUS(AE_NO_MEMORY); 501 } 502 503 /* 504 * Evaluate the \_Sx namespace object containing the register values 505 * for this state 506 */ 507 info->relative_pathname = 508 ACPI_CAST_PTR(char, acpi_gbl_sleep_state_names[sleep_state]); 509 status = acpi_ns_evaluate(info); 510 if (ACPI_FAILURE(status)) { 511 goto cleanup; 512 } 513 514 /* Must have a return object */ 515 516 if (!info->return_object) { 517 ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]", 518 info->relative_pathname)); 519 status = AE_AML_NO_RETURN_VALUE; 520 goto cleanup; 521 } 522 523 /* Return object must be of type Package */ 524 525 if (info->return_object->common.type != ACPI_TYPE_PACKAGE) { 526 ACPI_ERROR((AE_INFO, 527 "Sleep State return object is not a Package")); 528 status = AE_AML_OPERAND_TYPE; 529 goto cleanup1; 530 } 531 532 /* 533 * Any warnings about the package length or the object types have 534 * already been issued by the predefined name module -- there is no 535 * need to repeat them here. 536 */ 537 elements = info->return_object->package.elements; 538 switch (info->return_object->package.count) { 539 case 0: 540 541 status = AE_AML_PACKAGE_LIMIT; 542 break; 543 544 case 1: 545 546 if (elements[0]->common.type != ACPI_TYPE_INTEGER) { 547 status = AE_AML_OPERAND_TYPE; 548 break; 549 } 550 551 /* A valid _Sx_ package with one integer */ 552 553 *sleep_type_a = (u8)elements[0]->integer.value; 554 *sleep_type_b = (u8)(elements[0]->integer.value >> 8); 555 break; 556 557 case 2: 558 default: 559 560 if ((elements[0]->common.type != ACPI_TYPE_INTEGER) || 561 (elements[1]->common.type != ACPI_TYPE_INTEGER)) { 562 status = AE_AML_OPERAND_TYPE; 563 break; 564 } 565 566 /* A valid _Sx_ package with two integers */ 567 568 *sleep_type_a = (u8)elements[0]->integer.value; 569 *sleep_type_b = (u8)elements[1]->integer.value; 570 break; 571 } 572 573cleanup1: 574 acpi_ut_remove_reference(info->return_object); 575 576cleanup: 577 if (ACPI_FAILURE(status)) { 578 ACPI_EXCEPTION((AE_INFO, status, 579 "While evaluating Sleep State [%s]", 580 info->relative_pathname)); 581 } 582 583 ACPI_FREE(info); 584 return_ACPI_STATUS(status); 585} 586 587ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data) 588