/******************************************************************************
 *
 * Name: hwesleep.c - ACPI Hardware Sleep/Wake Support functions for the
 *                    extended FADT-V5 sleep registers.
 *
 *****************************************************************************/

/******************************************************************************
 *
 * 1. Copyright Notice
 *
 * Some or all of this work - Copyright (c) 1999 - 2012, 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    ("hwesleep")


/*******************************************************************************
 *
 * FUNCTION:    AcpiHwExecuteSleepMethod
 *
 * PARAMETERS:  MethodPathname      - Pathname of method to execute
 *              IntegerArgument     - Argument to pass to the method
 *
 * RETURN:      None
 *
 * DESCRIPTION: Execute a sleep/wake related method with one integer argument
 *              and no return value.
 *
 ******************************************************************************/

void
AcpiHwExecuteSleepMethod (
    char                    *MethodPathname,
    UINT32                  IntegerArgument)
{
    ACPI_OBJECT_LIST        ArgList;
    ACPI_OBJECT             Arg;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE (HwExecuteSleepMethod);


    /* One argument, IntegerArgument; No return value expected */

    ArgList.Count = 1;
    ArgList.Pointer = &Arg;
    Arg.Type = ACPI_TYPE_INTEGER;
    Arg.Integer.Value = (UINT64) IntegerArgument;

    Status = AcpiEvaluateObject (NULL, MethodPathname, &ArgList, NULL);
    if (ACPI_FAILURE (Status) && Status != AE_NOT_FOUND)
    {
        ACPI_EXCEPTION ((AE_INFO, Status, "While executing method %s",
            MethodPathname));
    }

    return_VOID;
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiHwExtendedSleep
 *
 * PARAMETERS:  SleepState          - Which sleep state to enter
 *              Flags               - ACPI_EXECUTE_GTS to run optional method
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Enter a system sleep state via the extended FADT sleep
 *              registers (V5 FADT).
 *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 *
 ******************************************************************************/

ACPI_STATUS
AcpiHwExtendedSleep (
    UINT8                   SleepState,
    UINT8                   Flags)
{
    ACPI_STATUS             Status;
    UINT8                   SleepTypeValue;
    UINT64                  SleepStatus;


    ACPI_FUNCTION_TRACE (HwExtendedSleep);


    /* Extended sleep registers must be valid */

    if (!AcpiGbl_FADT.SleepControl.Address ||
        !AcpiGbl_FADT.SleepStatus.Address)
    {
        return_ACPI_STATUS (AE_NOT_EXIST);
    }

    /* Clear wake status (WAK_STS) */

    Status = AcpiWrite ((UINT64) ACPI_X_WAKE_STATUS, &AcpiGbl_FADT.SleepStatus);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    AcpiGbl_SystemAwakeAndRunning = FALSE;

    /* Optionally execute _GTS (Going To Sleep) */

    if (Flags & ACPI_EXECUTE_GTS)
    {
        AcpiHwExecuteSleepMethod (METHOD_PATHNAME__GTS, SleepState);
    }

    /* Flush caches, as per ACPI specification */

    ACPI_FLUSH_CPU_CACHE ();

    /*
     * Set the SLP_TYP and SLP_EN bits.
     *
     * Note: We only use the first value returned by the \_Sx method
     * (AcpiGbl_SleepTypeA) - As per ACPI specification.
     */
    ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
        "Entering sleep state [S%u]\n", SleepState));

    SleepTypeValue = ((AcpiGbl_SleepTypeA << ACPI_X_SLEEP_TYPE_POSITION) &
        ACPI_X_SLEEP_TYPE_MASK);

    Status = AcpiWrite ((UINT64) (SleepTypeValue | ACPI_X_SLEEP_ENABLE),
        &AcpiGbl_FADT.SleepControl);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* Wait for transition back to Working State */

    do
    {
        Status = AcpiRead (&SleepStatus, &AcpiGbl_FADT.SleepStatus);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }

    } while (!(((UINT8) SleepStatus) & ACPI_X_WAKE_STATUS));

    return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiHwExtendedWakePrep
 *
 * PARAMETERS:  SleepState          - Which sleep state we just exited
 *              Flags               - ACPI_EXECUTE_BFS to run optional method
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Perform first part of OS-independent ACPI cleanup after
 *              a sleep. Called with interrupts ENABLED.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiHwExtendedWakePrep (
    UINT8                   SleepState,
    UINT8                   Flags)
{
    ACPI_STATUS             Status;
    UINT8                   SleepTypeValue;


    ACPI_FUNCTION_TRACE (HwExtendedWakePrep);


    Status = AcpiGetSleepTypeData (ACPI_STATE_S0,
                    &AcpiGbl_SleepTypeA, &AcpiGbl_SleepTypeB);
    if (ACPI_SUCCESS (Status))
    {
        SleepTypeValue = ((AcpiGbl_SleepTypeA << ACPI_X_SLEEP_TYPE_POSITION) &
            ACPI_X_SLEEP_TYPE_MASK);

        (void) AcpiWrite ((UINT64) (SleepTypeValue | ACPI_X_SLEEP_ENABLE),
            &AcpiGbl_FADT.SleepControl);
    }

    /* Optionally execute _BFS (Back From Sleep) */

    if (Flags & ACPI_EXECUTE_BFS)
    {
        AcpiHwExecuteSleepMethod (METHOD_PATHNAME__BFS, SleepState);
    }
    return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiHwExtendedWake
 *
 * PARAMETERS:  SleepState          - Which sleep state we just exited
 *              Flags               - Reserved, set to zero
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 *              Called with interrupts ENABLED.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiHwExtendedWake (
    UINT8                   SleepState,
    UINT8                   Flags)
{
    ACPI_FUNCTION_TRACE (HwExtendedWake);


    /* Ensure EnterSleepStatePrep -> EnterSleepState ordering */

    AcpiGbl_SleepTypeA = ACPI_SLEEP_TYPE_INVALID;

    /* Execute the wake methods */

    AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WAKING);
    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) AcpiWrite ((UINT64) ACPI_X_WAKE_STATUS, &AcpiGbl_FADT.SleepStatus);
    AcpiGbl_SystemAwakeAndRunning = TRUE;

    AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WORKING);
    return_ACPI_STATUS (AE_OK);
}
