355 lines
11 KiB
C
355 lines
11 KiB
C
/******************************************************************************
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*
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* Name: hwsleep.c - ACPI Hardware Sleep/Wake Support functions for the
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* original/legacy sleep/PM registers.
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2013, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include "acpi.h"
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#include "accommon.h"
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#define _COMPONENT ACPI_HARDWARE
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ACPI_MODULE_NAME ("hwsleep")
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#if (!ACPI_REDUCED_HARDWARE) /* Entire module */
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/*******************************************************************************
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*
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* FUNCTION: AcpiHwLegacySleep
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*
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* PARAMETERS: SleepState - Which sleep state to enter
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*
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* RETURN: Status
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*
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* DESCRIPTION: Enter a system sleep state via the legacy FADT PM registers
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* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiHwLegacySleep (
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UINT8 SleepState)
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{
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ACPI_BIT_REGISTER_INFO *SleepTypeRegInfo;
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ACPI_BIT_REGISTER_INFO *SleepEnableRegInfo;
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UINT32 Pm1aControl;
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UINT32 Pm1bControl;
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UINT32 InValue;
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ACPI_STATUS Status;
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ACPI_FUNCTION_TRACE (HwLegacySleep);
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SleepTypeRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_TYPE);
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SleepEnableRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_ENABLE);
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/* Clear wake status */
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Status = AcpiWriteBitRegister (ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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/* Clear all fixed and general purpose status bits */
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Status = AcpiHwClearAcpiStatus ();
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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/*
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* 1) Disable/Clear all GPEs
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* 2) Enable all wakeup GPEs
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*/
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Status = AcpiHwDisableAllGpes ();
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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AcpiGbl_SystemAwakeAndRunning = FALSE;
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Status = AcpiHwEnableAllWakeupGpes ();
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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/* Get current value of PM1A control */
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Status = AcpiHwRegisterRead (ACPI_REGISTER_PM1_CONTROL,
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&Pm1aControl);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
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"Entering sleep state [S%u]\n", SleepState));
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/* Clear the SLP_EN and SLP_TYP fields */
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Pm1aControl &= ~(SleepTypeRegInfo->AccessBitMask |
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SleepEnableRegInfo->AccessBitMask);
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Pm1bControl = Pm1aControl;
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/* Insert the SLP_TYP bits */
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Pm1aControl |= (AcpiGbl_SleepTypeA << SleepTypeRegInfo->BitPosition);
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Pm1bControl |= (AcpiGbl_SleepTypeB << SleepTypeRegInfo->BitPosition);
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/*
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* We split the writes of SLP_TYP and SLP_EN to workaround
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* poorly implemented hardware.
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*/
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/* Write #1: write the SLP_TYP data to the PM1 Control registers */
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Status = AcpiHwWritePm1Control (Pm1aControl, Pm1bControl);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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/* Insert the sleep enable (SLP_EN) bit */
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Pm1aControl |= SleepEnableRegInfo->AccessBitMask;
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Pm1bControl |= SleepEnableRegInfo->AccessBitMask;
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/* Flush caches, as per ACPI specification */
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ACPI_FLUSH_CPU_CACHE ();
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/* Write #2: Write both SLP_TYP + SLP_EN */
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Status = AcpiHwWritePm1Control (Pm1aControl, Pm1bControl);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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if (SleepState > ACPI_STATE_S3)
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{
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/*
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* We wanted to sleep > S3, but it didn't happen (by virtue of the
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* fact that we are still executing!)
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*
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* Wait ten seconds, then try again. This is to get S4/S5 to work on
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* all machines.
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*
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* We wait so long to allow chipsets that poll this reg very slowly
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* to still read the right value. Ideally, this block would go
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* away entirely.
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*/
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AcpiOsStall (10 * ACPI_USEC_PER_SEC);
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Status = AcpiHwRegisterWrite (ACPI_REGISTER_PM1_CONTROL,
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SleepEnableRegInfo->AccessBitMask);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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}
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/* Wait for transition back to Working State */
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do
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{
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Status = AcpiReadBitRegister (ACPI_BITREG_WAKE_STATUS, &InValue);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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} while (!InValue);
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return_ACPI_STATUS (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiHwLegacyWakePrep
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*
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* PARAMETERS: SleepState - Which sleep state we just exited
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*
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* RETURN: Status
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*
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* DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
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* sleep.
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* Called with interrupts ENABLED.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiHwLegacyWakePrep (
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UINT8 SleepState)
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{
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ACPI_STATUS Status;
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ACPI_BIT_REGISTER_INFO *SleepTypeRegInfo;
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ACPI_BIT_REGISTER_INFO *SleepEnableRegInfo;
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UINT32 Pm1aControl;
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UINT32 Pm1bControl;
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ACPI_FUNCTION_TRACE (HwLegacyWakePrep);
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/*
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* Set SLP_TYPE and SLP_EN to state S0.
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* This is unclear from the ACPI Spec, but it is required
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* by some machines.
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*/
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Status = AcpiGetSleepTypeData (ACPI_STATE_S0,
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&AcpiGbl_SleepTypeA, &AcpiGbl_SleepTypeB);
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if (ACPI_SUCCESS (Status))
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{
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SleepTypeRegInfo =
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AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_TYPE);
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SleepEnableRegInfo =
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AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_ENABLE);
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/* Get current value of PM1A control */
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Status = AcpiHwRegisterRead (ACPI_REGISTER_PM1_CONTROL,
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&Pm1aControl);
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if (ACPI_SUCCESS (Status))
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{
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/* Clear the SLP_EN and SLP_TYP fields */
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Pm1aControl &= ~(SleepTypeRegInfo->AccessBitMask |
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SleepEnableRegInfo->AccessBitMask);
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Pm1bControl = Pm1aControl;
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/* Insert the SLP_TYP bits */
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Pm1aControl |= (AcpiGbl_SleepTypeA <<
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SleepTypeRegInfo->BitPosition);
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Pm1bControl |= (AcpiGbl_SleepTypeB <<
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SleepTypeRegInfo->BitPosition);
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/* Write the control registers and ignore any errors */
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(void) AcpiHwWritePm1Control (Pm1aControl, Pm1bControl);
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}
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}
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return_ACPI_STATUS (Status);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiHwLegacyWake
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*
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* PARAMETERS: SleepState - Which sleep state we just exited
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*
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* RETURN: Status
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*
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* DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
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* Called with interrupts ENABLED.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiHwLegacyWake (
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UINT8 SleepState)
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{
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ACPI_STATUS Status;
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ACPI_FUNCTION_TRACE (HwLegacyWake);
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/* Ensure EnterSleepStatePrep -> EnterSleepState ordering */
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AcpiGbl_SleepTypeA = ACPI_SLEEP_TYPE_INVALID;
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AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WAKING);
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/*
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* GPEs must be enabled before _WAK is called as GPEs
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* might get fired there
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*
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* Restore the GPEs:
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* 1) Disable/Clear all GPEs
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* 2) Enable all runtime GPEs
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*/
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Status = AcpiHwDisableAllGpes ();
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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Status = AcpiHwEnableAllRuntimeGpes ();
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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/*
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* Now we can execute _WAK, etc. Some machines require that the GPEs
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* are enabled before the wake methods are executed.
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*/
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AcpiHwExecuteSleepMethod (METHOD_PATHNAME__WAK, SleepState);
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/*
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* Some BIOS code assumes that WAK_STS will be cleared on resume
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* and use it to determine whether the system is rebooting or
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* resuming. Clear WAK_STS for compatibility.
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*/
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(void) AcpiWriteBitRegister (ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
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AcpiGbl_SystemAwakeAndRunning = TRUE;
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/* Enable power button */
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(void) AcpiWriteBitRegister(
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AcpiGbl_FixedEventInfo[ACPI_EVENT_POWER_BUTTON].EnableRegisterId,
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ACPI_ENABLE_EVENT);
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(void) AcpiWriteBitRegister(
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AcpiGbl_FixedEventInfo[ACPI_EVENT_POWER_BUTTON].StatusRegisterId,
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ACPI_CLEAR_STATUS);
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AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WORKING);
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return_ACPI_STATUS (Status);
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}
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#endif /* !ACPI_REDUCED_HARDWARE */
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