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/*-
* Copyright (c) 2001 Mitsuru IWASAKI
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include "acpi.h"
#include <machine/cpufunc.h>
#include <dev/acpica/acpica_support.h>
ACPI_MODULE_NAME("SUPPORT")
/*
* Implement support code temporary here until officially merged into
* Intel ACPI CA release.
*/
#undef _COMPONENT
#define _COMPONENT ACPI_HARDWARE
/******************************************************************************
*
* FUNCTION: AcpiEnterSleepStateS4Bios
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Enter a system sleep state S4BIOS
*
******************************************************************************/
ACPI_STATUS
AcpiEnterSleepStateS4Bios (
void)
{
ACPI_OBJECT_LIST ArgList;
ACPI_OBJECT Arg;
UINT32 Value;
ACPI_FUNCTION_TRACE ("AcpiEnterSleepStateS4Bios");
/* run the _PTS and _GTS methods */
ACPI_MEMSET(&ArgList, 0, sizeof(ArgList));
ArgList.Count = 1;
ArgList.Pointer = &Arg;
ACPI_MEMSET(&Arg, 0, sizeof(Arg));
Arg.Type = ACPI_TYPE_INTEGER;
Arg.Integer.Value = ACPI_STATE_S4;
AcpiEvaluateObject (NULL, "\\_PTS", &ArgList, NULL);
AcpiEvaluateObject (NULL, "\\_GTS", &ArgList, NULL);
/* clear wake status */
AcpiSetRegister (ACPI_BITREG_WAKE_STATUS, 1, ACPI_MTX_LOCK);
ACPI_DISABLE_IRQS ();
AcpiHwDisableNonWakeupGpes();
/* flush caches */
ACPI_FLUSH_CPU_CACHE ();
/* write the value to command port and wait until we enter sleep state */
do
{
AcpiOsStall(1000000);
AcpiOsWritePort (AcpiGbl_FADT->SmiCmd, AcpiGbl_FADT->S4BiosReq, 8);
AcpiGetRegister (ACPI_BITREG_WAKE_STATUS, &Value, ACPI_MTX_LOCK);
}
while (!Value);
AcpiHwEnableNonWakeupGpes();
ACPI_ENABLE_IRQS ();
return_ACPI_STATUS (AE_OK);
}
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