/****************************************************************************** * * Name: hwsleep.c - ACPI Hardware Sleep/Wake Support functions for the * original/legacy sleep/PM registers. * *****************************************************************************/ /****************************************************************************** * * 1. Copyright Notice * * Some or all of this work - Copyright (c) 1999 - 2014, Intel Corp. * All rights reserved. * * 2. License * * 2.1. This is your license from Intel Corp. under its intellectual property * rights. You may have additional license terms from the party that provided * you this software, covering your right to use that party's intellectual * property rights. * * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a * copy of the source code appearing in this file ("Covered Code") an * irrevocable, perpetual, worldwide license under Intel's copyrights in the * base code distributed originally by Intel ("Original Intel Code") to copy, * make derivatives, distribute, use and display any portion of the Covered * Code in any form, with the right to sublicense such rights; and * * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent * license (with the right to sublicense), under only those claims of Intel * patents that are infringed by the Original Intel Code, to make, use, sell, * offer to sell, and import the Covered Code and derivative works thereof * solely to the minimum extent necessary to exercise the above copyright * license, and in no event shall the patent license extend to any additions * to or modifications of the Original Intel Code. No other license or right * is granted directly or by implication, estoppel or otherwise; * * The above copyright and patent license is granted only if the following * conditions are met: * * 3. Conditions * * 3.1. Redistribution of Source with Rights to Further Distribute Source. * Redistribution of source code of any substantial portion of the Covered * Code or modification with rights to further distribute source must include * the above Copyright Notice, the above License, this list of Conditions, * and the following Disclaimer and Export Compliance provision. In addition, * Licensee must cause all Covered Code to which Licensee contributes to * contain a file documenting the changes Licensee made to create that Covered * Code and the date of any change. Licensee must include in that file the * documentation of any changes made by any predecessor Licensee. Licensee * must include a prominent statement that the modification is derived, * directly or indirectly, from Original Intel Code. * * 3.2. Redistribution of Source with no Rights to Further Distribute Source. * Redistribution of source code of any substantial portion of the Covered * Code or modification without rights to further distribute source must * include the following Disclaimer and Export Compliance provision in the * documentation and/or other materials provided with distribution. In * addition, Licensee may not authorize further sublicense of source of any * portion of the Covered Code, and must include terms to the effect that the * license from Licensee to its licensee is limited to the intellectual * property embodied in the software Licensee provides to its licensee, and * not to intellectual property embodied in modifications its licensee may * make. * * 3.3. Redistribution of Executable. Redistribution in executable form of any * substantial portion of the Covered Code or modification must reproduce the * above Copyright Notice, and the following Disclaimer and Export Compliance * provision in the documentation and/or other materials provided with the * distribution. * * 3.4. Intel retains all right, title, and interest in and to the Original * Intel Code. * * 3.5. Neither the name Intel nor any other trademark owned or controlled by * Intel shall be used in advertising or otherwise to promote the sale, use or * other dealings in products derived from or relating to the Covered Code * without prior written authorization from Intel. * * 4. Disclaimer and Export Compliance * * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A * PARTICULAR PURPOSE. * * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY * LIMITED REMEDY. * * 4.3. Licensee shall not export, either directly or indirectly, any of this * software or system incorporating such software without first obtaining any * required license or other approval from the U. S. Department of Commerce or * any other agency or department of the United States Government. In the * event Licensee exports any such software from the United States or * re-exports any such software from a foreign destination, Licensee shall * ensure that the distribution and export/re-export of the software is in * compliance with all laws, regulations, orders, or other restrictions of the * U.S. Export Administration Regulations. Licensee agrees that neither it nor * any of its subsidiaries will export/re-export any technical data, process, * software, or service, directly or indirectly, to any country for which the * United States government or any agency thereof requires an export license, * other governmental approval, or letter of assurance, without first obtaining * such license, approval or letter. * *****************************************************************************/ #include "acpi.h" #include "accommon.h" #define _COMPONENT ACPI_HARDWARE ACPI_MODULE_NAME ("hwsleep") #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ /******************************************************************************* * * FUNCTION: AcpiHwLegacySleep * * PARAMETERS: SleepState - Which sleep state to enter * * RETURN: Status * * DESCRIPTION: Enter a system sleep state via the legacy FADT PM registers * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED * ******************************************************************************/ ACPI_STATUS AcpiHwLegacySleep ( UINT8 SleepState) { ACPI_BIT_REGISTER_INFO *SleepTypeRegInfo; ACPI_BIT_REGISTER_INFO *SleepEnableRegInfo; UINT32 Pm1aControl; UINT32 Pm1bControl; UINT32 InValue; ACPI_STATUS Status; ACPI_FUNCTION_TRACE (HwLegacySleep); SleepTypeRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_TYPE); SleepEnableRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_ENABLE); /* Clear wake status */ Status = AcpiWriteBitRegister (ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } /* Clear all fixed and general purpose status bits */ Status = AcpiHwClearAcpiStatus (); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } /* * 1) Disable/Clear all GPEs * 2) Enable all wakeup GPEs */ Status = AcpiHwDisableAllGpes (); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } AcpiGbl_SystemAwakeAndRunning = FALSE; Status = AcpiHwEnableAllWakeupGpes (); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } /* Get current value of PM1A control */ Status = AcpiHwRegisterRead (ACPI_REGISTER_PM1_CONTROL, &Pm1aControl); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "Entering sleep state [S%u]\n", SleepState)); /* Clear the SLP_EN and SLP_TYP fields */ Pm1aControl &= ~(SleepTypeRegInfo->AccessBitMask | SleepEnableRegInfo->AccessBitMask); Pm1bControl = Pm1aControl; /* Insert the SLP_TYP bits */ Pm1aControl |= (AcpiGbl_SleepTypeA << SleepTypeRegInfo->BitPosition); Pm1bControl |= (AcpiGbl_SleepTypeB << SleepTypeRegInfo->BitPosition); /* * We split the writes of SLP_TYP and SLP_EN to workaround * poorly implemented hardware. */ /* Write #1: write the SLP_TYP data to the PM1 Control registers */ Status = AcpiHwWritePm1Control (Pm1aControl, Pm1bControl); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } /* Insert the sleep enable (SLP_EN) bit */ Pm1aControl |= SleepEnableRegInfo->AccessBitMask; Pm1bControl |= SleepEnableRegInfo->AccessBitMask; /* Flush caches, as per ACPI specification */ ACPI_FLUSH_CPU_CACHE (); /* Write #2: Write both SLP_TYP + SLP_EN */ Status = AcpiHwWritePm1Control (Pm1aControl, Pm1bControl); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } if (SleepState > ACPI_STATE_S3) { /* * We wanted to sleep > S3, but it didn't happen (by virtue of the * fact that we are still executing!) * * Wait ten seconds, then try again. This is to get S4/S5 to work on * all machines. * * We wait so long to allow chipsets that poll this reg very slowly * to still read the right value. Ideally, this block would go * away entirely. */ AcpiOsStall (10 * ACPI_USEC_PER_SEC); Status = AcpiHwRegisterWrite (ACPI_REGISTER_PM1_CONTROL, SleepEnableRegInfo->AccessBitMask); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } } /* Wait for transition back to Working State */ do { Status = AcpiReadBitRegister (ACPI_BITREG_WAKE_STATUS, &InValue); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } } while (!InValue); return_ACPI_STATUS (AE_OK); } /******************************************************************************* * * FUNCTION: AcpiHwLegacyWakePrep * * PARAMETERS: SleepState - Which sleep state we just exited * * RETURN: Status * * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a * sleep. * Called with interrupts ENABLED. * ******************************************************************************/ ACPI_STATUS AcpiHwLegacyWakePrep ( UINT8 SleepState) { ACPI_STATUS Status; ACPI_BIT_REGISTER_INFO *SleepTypeRegInfo; ACPI_BIT_REGISTER_INFO *SleepEnableRegInfo; UINT32 Pm1aControl; UINT32 Pm1bControl; ACPI_FUNCTION_TRACE (HwLegacyWakePrep); /* * Set SLP_TYPE and SLP_EN to state S0. * This is unclear from the ACPI Spec, but it is required * by some machines. */ Status = AcpiGetSleepTypeData (ACPI_STATE_S0, &AcpiGbl_SleepTypeA, &AcpiGbl_SleepTypeB); if (ACPI_SUCCESS (Status)) { SleepTypeRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_TYPE); SleepEnableRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_ENABLE); /* Get current value of PM1A control */ Status = AcpiHwRegisterRead (ACPI_REGISTER_PM1_CONTROL, &Pm1aControl); if (ACPI_SUCCESS (Status)) { /* Clear the SLP_EN and SLP_TYP fields */ Pm1aControl &= ~(SleepTypeRegInfo->AccessBitMask | SleepEnableRegInfo->AccessBitMask); Pm1bControl = Pm1aControl; /* Insert the SLP_TYP bits */ Pm1aControl |= (AcpiGbl_SleepTypeA << SleepTypeRegInfo->BitPosition); Pm1bControl |= (AcpiGbl_SleepTypeB << SleepTypeRegInfo->BitPosition); /* Write the control registers and ignore any errors */ (void) AcpiHwWritePm1Control (Pm1aControl, Pm1bControl); } } return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiHwLegacyWake * * PARAMETERS: SleepState - Which sleep state we just exited * * RETURN: Status * * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep * Called with interrupts ENABLED. * ******************************************************************************/ ACPI_STATUS AcpiHwLegacyWake ( UINT8 SleepState) { ACPI_STATUS Status; ACPI_FUNCTION_TRACE (HwLegacyWake); /* Ensure EnterSleepStatePrep -> EnterSleepState ordering */ AcpiGbl_SleepTypeA = ACPI_SLEEP_TYPE_INVALID; AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WAKING); /* * GPEs must be enabled before _WAK is called as GPEs * might get fired there * * Restore the GPEs: * 1) Disable/Clear all GPEs * 2) Enable all runtime GPEs */ Status = AcpiHwDisableAllGpes (); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } Status = AcpiHwEnableAllRuntimeGpes (); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } /* * Now we can execute _WAK, etc. Some machines require that the GPEs * are enabled before the wake methods are executed. */ AcpiHwExecuteSleepMethod (METHOD_PATHNAME__WAK, SleepState); /* * Some BIOS code assumes that WAK_STS will be cleared on resume * and use it to determine whether the system is rebooting or * resuming. Clear WAK_STS for compatibility. */ (void) AcpiWriteBitRegister (ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS); AcpiGbl_SystemAwakeAndRunning = TRUE; /* Enable power button */ (void) AcpiWriteBitRegister( AcpiGbl_FixedEventInfo[ACPI_EVENT_POWER_BUTTON].EnableRegisterId, ACPI_ENABLE_EVENT); (void) AcpiWriteBitRegister( AcpiGbl_FixedEventInfo[ACPI_EVENT_POWER_BUTTON].StatusRegisterId, ACPI_CLEAR_STATUS); AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WORKING); return_ACPI_STATUS (Status); } #endif /* !ACPI_REDUCED_HARDWARE */