hwacpi.c revision 85756
154976Sache 254976Sache/****************************************************************************** 354976Sache * 454976Sache * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface 554976Sache * $Revision: 46 $ 654976Sache * 754976Sache *****************************************************************************/ 854976Sache 954976Sache/****************************************************************************** 1054976Sache * 1154976Sache * 1. Copyright Notice 1254976Sache * 1354976Sache * Some or all of this work - Copyright (c) 1999, 2000, 2001, Intel Corp. 1454976Sache * All rights reserved. 1554976Sache * 1654976Sache * 2. License 1754976Sache * 1854976Sache * 2.1. This is your license from Intel Corp. under its intellectual property 1954976Sache * rights. You may have additional license terms from the party that provided 2054976Sache * you this software, covering your right to use that party's intellectual 2154976Sache * property rights. 2254976Sache * 2354976Sache * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 2454976Sache * copy of the source code appearing in this file ("Covered Code") an 2554976Sache * irrevocable, perpetual, worldwide license under Intel's copyrights in the 2654976Sache * base code distributed originally by Intel ("Original Intel Code") to copy, 2754976Sache * make derivatives, distribute, use and display any portion of the Covered 2854976Sache * Code in any form, with the right to sublicense such rights; and 2954976Sache * 3054976Sache * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 3154976Sache * license (with the right to sublicense), under only those claims of Intel 3254976Sache * patents that are infringed by the Original Intel Code, to make, use, sell, 3354976Sache * offer to sell, and import the Covered Code and derivative works thereof 3454976Sache * solely to the minimum extent necessary to exercise the above copyright 3554976Sache * license, and in no event shall the patent license extend to any additions 3654976Sache * to or modifications of the Original Intel Code. No other license or right 3754976Sache * is granted directly or by implication, estoppel or otherwise; 3854976Sache * 3954976Sache * The above copyright and patent license is granted only if the following 4054976Sache * conditions are met: 4154976Sache * 4254976Sache * 3. Conditions 4354976Sache * 4454976Sache * 3.1. Redistribution of Source with Rights to Further Distribute Source. 4554976Sache * Redistribution of source code of any substantial portion of the Covered 4654976Sache * Code or modification with rights to further distribute source must include 4754976Sache * the above Copyright Notice, the above License, this list of Conditions, 4854976Sache * and the following Disclaimer and Export Compliance provision. In addition, 4954976Sache * Licensee must cause all Covered Code to which Licensee contributes to 5054976Sache * contain a file documenting the changes Licensee made to create that Covered 5154976Sache * Code and the date of any change. Licensee must include in that file the 5254976Sache * documentation of any changes made by any predecessor Licensee. Licensee 5354976Sache * must include a prominent statement that the modification is derived, 5454976Sache * directly or indirectly, from Original Intel Code. 5554976Sache * 5654976Sache * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 5754976Sache * Redistribution of source code of any substantial portion of the Covered 5854976Sache * Code or modification without rights to further distribute source must 5954976Sache * include the following Disclaimer and Export Compliance provision in the 6054976Sache * documentation and/or other materials provided with distribution. In 6154976Sache * addition, Licensee may not authorize further sublicense of source of any 6254976Sache * portion of the Covered Code, and must include terms to the effect that the 6354976Sache * license from Licensee to its licensee is limited to the intellectual 6454976Sache * property embodied in the software Licensee provides to its licensee, and 6554976Sache * not to intellectual property embodied in modifications its licensee may 6654976Sache * make. 6754976Sache * 6854976Sache * 3.3. Redistribution of Executable. Redistribution in executable form of any 6954976Sache * substantial portion of the Covered Code or modification must reproduce the 7054976Sache * above Copyright Notice, and the following Disclaimer and Export Compliance 7154976Sache * provision in the documentation and/or other materials provided with the 7254976Sache * distribution. 7354976Sache * 7454976Sache * 3.4. Intel retains all right, title, and interest in and to the Original 7554976Sache * Intel Code. 7654976Sache * 7754976Sache * 3.5. Neither the name Intel nor any other trademark owned or controlled by 7854976Sache * Intel shall be used in advertising or otherwise to promote the sale, use or 7954976Sache * other dealings in products derived from or relating to the Covered Code 8054976Sache * without prior written authorization from Intel. 8154976Sache * 8254976Sache * 4. Disclaimer and Export Compliance 8354976Sache * 8454976Sache * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 8554976Sache * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 8654976Sache * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 8754976Sache * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 8854976Sache * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 8954976Sache * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 9054976Sache * PARTICULAR PURPOSE. 9154976Sache * 9254976Sache * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 9354976Sache * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 9454976Sache * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 9554976Sache * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 9654976Sache * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 9754976Sache * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 9854976Sache * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 9954976Sache * LIMITED REMEDY. 10054976Sache * 10154976Sache * 4.3. Licensee shall not export, either directly or indirectly, any of this 10254976Sache * software or system incorporating such software without first obtaining any 10354976Sache * required license or other approval from the U. S. Department of Commerce or 10454976Sache * any other agency or department of the United States Government. In the 10554976Sache * event Licensee exports any such software from the United States or 10654976Sache * re-exports any such software from a foreign destination, Licensee shall 10754976Sache * ensure that the distribution and export/re-export of the software is in 10854976Sache * compliance with all laws, regulations, orders, or other restrictions of the 10954976Sache * U.S. Export Administration Regulations. Licensee agrees that neither it nor 11054976Sache * any of its subsidiaries will export/re-export any technical data, process, 11154976Sache * software, or service, directly or indirectly, to any country for which the 11254976Sache * United States government or any agency thereof requires an export license, 11354976Sache * other governmental approval, or letter of assurance, without first obtaining 11454976Sache * such license, approval or letter. 11554976Sache * 11654976Sache *****************************************************************************/ 11754976Sache 11854976Sache#define __HWACPI_C__ 11954976Sache 12054976Sache#include "acpi.h" 12154976Sache#include "achware.h" 12254976Sache 12354976Sache 12454976Sache#define _COMPONENT ACPI_HARDWARE 12554976Sache MODULE_NAME ("hwacpi") 12654976Sache 12754976Sache 12854976Sache/****************************************************************************** 12954976Sache * 13054976Sache * FUNCTION: AcpiHwInitialize 13154976Sache * 13254976Sache * PARAMETERS: None 13354976Sache * 13454976Sache * RETURN: Status 13554976Sache * 13654976Sache * DESCRIPTION: Initialize and validate various ACPI registers 13754976Sache * 13854976Sache ******************************************************************************/ 13954976Sache 14054976SacheACPI_STATUS 14154976SacheAcpiHwInitialize ( 14254976Sache void) 14354976Sache{ 14454976Sache ACPI_STATUS Status = AE_OK; 14554976Sache UINT32 Index; 14654976Sache 14754976Sache 14854976Sache FUNCTION_TRACE ("HwInitialize"); 14954976Sache 15054976Sache 15154976Sache /* We must have the ACPI tables by the time we get here */ 15254976Sache 15354976Sache if (!AcpiGbl_FADT) 15454976Sache { 15554976Sache AcpiGbl_RestoreAcpiChipset = FALSE; 15654976Sache 15754976Sache ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No FADT!\n")); 15854976Sache 15954976Sache return_ACPI_STATUS (AE_NO_ACPI_TABLES); 16054976Sache } 16154976Sache 16254976Sache /* Identify current ACPI/legacy mode */ 16354976Sache 16454976Sache switch (AcpiGbl_SystemFlags & SYS_MODES_MASK) 16554976Sache { 16654976Sache case (SYS_MODE_ACPI): 16754976Sache 16854976Sache AcpiGbl_OriginalMode = SYS_MODE_ACPI; 16954976Sache ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "System supports ACPI mode only.\n")); 17054976Sache break; 17154976Sache 17254976Sache 17354976Sache case (SYS_MODE_LEGACY): 17454976Sache 17554976Sache AcpiGbl_OriginalMode = SYS_MODE_LEGACY; 17654976Sache ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 17754976Sache "Tables loaded from buffer, hardware assumed to support LEGACY mode only.\n")); 17854976Sache break; 17954976Sache 18054976Sache 18154976Sache case (SYS_MODE_ACPI | SYS_MODE_LEGACY): 18254976Sache 18354976Sache if (AcpiHwGetMode () == SYS_MODE_ACPI) 18454976Sache { 18554976Sache AcpiGbl_OriginalMode = SYS_MODE_ACPI; 18654976Sache } 18754976Sache else 18854976Sache { 18954976Sache AcpiGbl_OriginalMode = SYS_MODE_LEGACY; 19054976Sache } 19154976Sache 19254976Sache ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 19354976Sache "System supports both ACPI and LEGACY modes.\n")); 19454976Sache 19554976Sache ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 19654976Sache "System is currently in %s mode.\n", 19754976Sache (AcpiGbl_OriginalMode == SYS_MODE_ACPI) ? "ACPI" : "LEGACY")); 19854976Sache break; 19954976Sache } 20054976Sache 20154976Sache 20254976Sache if (AcpiGbl_SystemFlags & SYS_MODE_ACPI) 20354976Sache { 20454976Sache /* Target system supports ACPI mode */ 20554976Sache 20654976Sache /* 20754976Sache * The purpose of this code is to save the initial state 20854976Sache * of the ACPI event enable registers. An exit function will be 20954976Sache * registered which will restore this state when the application 21054976Sache * exits. The exit function will also clear all of the ACPI event 21154976Sache * status bits prior to restoring the original mode. 21254976Sache * 21354976Sache * The location of the PM1aEvtBlk enable registers is defined as the 21454976Sache * base of PM1aEvtBlk + DIV_2(PM1aEvtBlkLength). Since the spec further 21554976Sache * fully defines the PM1aEvtBlk to be a total of 4 bytes, the offset 21654976Sache * for the enable registers is always 2 from the base. It is hard 21754976Sache * coded here. If this changes in the spec, this code will need to 21854976Sache * be modified. The PM1bEvtBlk behaves as expected. 21954976Sache */ 22054976Sache AcpiGbl_Pm1EnableRegisterSave = (UINT16) AcpiHwRegisterRead ( 22154976Sache ACPI_MTX_LOCK, PM1_EN); 22254976Sache 22354976Sache 22454976Sache /* 22554976Sache * The GPEs behave similarly, except that the length of the register 22654976Sache * block is not fixed, so the buffer must be allocated with malloc 22754976Sache */ 22854976Sache if (ACPI_VALID_ADDRESS (AcpiGbl_FADT->XGpe0Blk.Address) && 22954976Sache AcpiGbl_FADT->Gpe0BlkLen) 23054976Sache { 23154976Sache /* GPE0 specified in FADT */ 23254976Sache 23354976Sache AcpiGbl_Gpe0EnableRegisterSave = ACPI_MEM_ALLOCATE ( 23454976Sache DIV_2 (AcpiGbl_FADT->Gpe0BlkLen)); 23554976Sache if (!AcpiGbl_Gpe0EnableRegisterSave) 23654976Sache { 23754976Sache return_ACPI_STATUS (AE_NO_MEMORY); 23854976Sache } 23954976Sache 24054976Sache /* Save state of GPE0 enable bits */ 24154976Sache 24254976Sache for (Index = 0; Index < DIV_2 (AcpiGbl_FADT->Gpe0BlkLen); Index++) 24354976Sache { 24454976Sache AcpiGbl_Gpe0EnableRegisterSave[Index] = 24554976Sache (UINT8) AcpiHwRegisterRead (ACPI_MTX_LOCK, GPE0_EN_BLOCK | Index); 24654976Sache } 24754976Sache } 24854976Sache 24954976Sache else 25054976Sache { 25154976Sache AcpiGbl_Gpe0EnableRegisterSave = NULL; 25254976Sache } 25354976Sache 25454976Sache if (ACPI_VALID_ADDRESS (AcpiGbl_FADT->XGpe1Blk.Address) && 25554976Sache AcpiGbl_FADT->Gpe1BlkLen) 25654976Sache { 25754976Sache /* GPE1 defined */ 25854976Sache 25954976Sache AcpiGbl_Gpe1EnableRegisterSave = ACPI_MEM_ALLOCATE ( 26054976Sache DIV_2 (AcpiGbl_FADT->Gpe1BlkLen)); 26154976Sache if (!AcpiGbl_Gpe1EnableRegisterSave) 26254976Sache { 26354976Sache return_ACPI_STATUS (AE_NO_MEMORY); 26454976Sache } 26554976Sache 26654976Sache /* save state of GPE1 enable bits */ 26754976Sache 26854976Sache for (Index = 0; Index < DIV_2 (AcpiGbl_FADT->Gpe1BlkLen); Index++) 26954976Sache { 27054976Sache AcpiGbl_Gpe1EnableRegisterSave[Index] = 27154976Sache (UINT8) AcpiHwRegisterRead (ACPI_MTX_LOCK, GPE1_EN_BLOCK | Index); 27254976Sache } 27354976Sache } 27454976Sache 27554976Sache else 27654976Sache { 27754976Sache AcpiGbl_Gpe1EnableRegisterSave = NULL; 27854976Sache } 27954976Sache } 28054976Sache 28154976Sache return_ACPI_STATUS (Status); 28254976Sache} 28354976Sache 28454976Sache 28554976Sache/****************************************************************************** 28654976Sache * 287 * FUNCTION: AcpiHwSetMode 288 * 289 * PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY 290 * 291 * RETURN: Status 292 * 293 * DESCRIPTION: Transitions the system into the requested mode or does nothing 294 * if the system is already in that mode. 295 * 296 ******************************************************************************/ 297 298ACPI_STATUS 299AcpiHwSetMode ( 300 UINT32 Mode) 301{ 302 303 ACPI_STATUS Status = AE_NO_HARDWARE_RESPONSE; 304 305 306 FUNCTION_TRACE ("HwSetMode"); 307 308 309 if (Mode == SYS_MODE_ACPI) 310 { 311 /* BIOS should have disabled ALL fixed and GP events */ 312 313 AcpiOsWritePort (AcpiGbl_FADT->SmiCmd, AcpiGbl_FADT->AcpiEnable, 8); 314 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Attempting to enable ACPI mode\n")); 315 } 316 317 else if (Mode == SYS_MODE_LEGACY) 318 { 319 /* 320 * BIOS should clear all fixed status bits and restore fixed event 321 * enable bits to default 322 */ 323 AcpiOsWritePort (AcpiGbl_FADT->SmiCmd, AcpiGbl_FADT->AcpiDisable, 8); 324 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 325 "Attempting to enable Legacy (non-ACPI) mode\n")); 326 } 327 328 /* Give the platform some time to react */ 329 330 AcpiOsStall (20000); 331 332 if (AcpiHwGetMode () == Mode) 333 { 334 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Mode %X successfully enabled\n", Mode)); 335 Status = AE_OK; 336 } 337 338 return_ACPI_STATUS (Status); 339} 340 341 342/****************************************************************************** 343 * 344 * FUNCTION: AcpiHwGetMode 345 * 346 * PARAMETERS: none 347 * 348 * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY 349 * 350 * DESCRIPTION: Return current operating state of system. Determined by 351 * querying the SCI_EN bit. 352 * 353 ******************************************************************************/ 354 355UINT32 356AcpiHwGetMode (void) 357{ 358 359 FUNCTION_TRACE ("HwGetMode"); 360 361 362 if (AcpiHwRegisterBitAccess (ACPI_READ, ACPI_MTX_LOCK, SCI_EN)) 363 { 364 return_VALUE (SYS_MODE_ACPI); 365 } 366 else 367 { 368 return_VALUE (SYS_MODE_LEGACY); 369 } 370} 371 372 373/****************************************************************************** 374 * 375 * FUNCTION: AcpiHwGetModeCapabilities 376 * 377 * PARAMETERS: none 378 * 379 * RETURN: logical OR of SYS_MODE_ACPI and SYS_MODE_LEGACY determined at initial 380 * system state. 381 * 382 * DESCRIPTION: Returns capablities of system 383 * 384 ******************************************************************************/ 385 386UINT32 387AcpiHwGetModeCapabilities (void) 388{ 389 390 FUNCTION_TRACE ("HwGetModeCapabilities"); 391 392 393 if (!(AcpiGbl_SystemFlags & SYS_MODES_MASK)) 394 { 395 if (AcpiHwGetMode () == SYS_MODE_LEGACY) 396 { 397 /* 398 * Assume that if this call is being made, AcpiInit has been called 399 * and ACPI support has been established by the presence of the 400 * tables. Therefore since we're in SYS_MODE_LEGACY, the system 401 * must support both modes 402 */ 403 AcpiGbl_SystemFlags |= (SYS_MODE_ACPI | SYS_MODE_LEGACY); 404 } 405 406 else 407 { 408 /* TBD: [Investigate] !!! this may be unsafe... */ 409 /* 410 * system is is ACPI mode, so try to switch back to LEGACY to see if 411 * it is supported 412 */ 413 AcpiHwSetMode (SYS_MODE_LEGACY); 414 415 if (AcpiHwGetMode () == SYS_MODE_LEGACY) 416 { 417 /* Now in SYS_MODE_LEGACY, so both are supported */ 418 419 AcpiGbl_SystemFlags |= (SYS_MODE_ACPI | SYS_MODE_LEGACY); 420 AcpiHwSetMode (SYS_MODE_ACPI); 421 } 422 423 else 424 { 425 /* Still in SYS_MODE_ACPI so this must be an ACPI only system */ 426 427 AcpiGbl_SystemFlags |= SYS_MODE_ACPI; 428 } 429 } 430 } 431 432 return_VALUE (AcpiGbl_SystemFlags & SYS_MODES_MASK); 433} 434 435 436