210 lines
6.2 KiB
C
210 lines
6.2 KiB
C
|
|
/******************************************************************************
|
|
*
|
|
* Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
|
|
*
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
* Copyright (C) 2000 - 2012, Intel Corp.
|
|
* 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,
|
|
* without modification.
|
|
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
|
|
* substantially similar to the "NO WARRANTY" disclaimer below
|
|
* ("Disclaimer") and any redistribution must be conditioned upon
|
|
* including a substantially similar Disclaimer requirement for further
|
|
* binary redistribution.
|
|
* 3. Neither the names of the above-listed copyright holders nor the names
|
|
* of any contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of the
|
|
* GNU General Public License ("GPL") version 2 as published by the Free
|
|
* Software Foundation.
|
|
*
|
|
* NO WARRANTY
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
|
|
*/
|
|
|
|
#define __HWACPI_C__
|
|
|
|
#include "acpi.h"
|
|
#include "accommon.h"
|
|
|
|
|
|
#define _COMPONENT ACPI_HARDWARE
|
|
ACPI_MODULE_NAME ("hwacpi")
|
|
|
|
|
|
#if (!ACPI_REDUCED_HARDWARE) /* Entire module */
|
|
/******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiHwSetMode
|
|
*
|
|
* PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Transitions the system into the requested mode.
|
|
*
|
|
******************************************************************************/
|
|
|
|
ACPI_STATUS
|
|
AcpiHwSetMode (
|
|
UINT32 Mode)
|
|
{
|
|
|
|
ACPI_STATUS Status;
|
|
UINT32 Retry;
|
|
|
|
|
|
ACPI_FUNCTION_TRACE (HwSetMode);
|
|
|
|
/*
|
|
* ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
|
|
* system does not support mode transition.
|
|
*/
|
|
if (!AcpiGbl_FADT.SmiCommand)
|
|
{
|
|
ACPI_ERROR ((AE_INFO, "No SMI_CMD in FADT, mode transition failed"));
|
|
return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
|
|
}
|
|
|
|
/*
|
|
* ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE
|
|
* in FADT: If it is zero, enabling or disabling is not supported.
|
|
* As old systems may have used zero for mode transition,
|
|
* we make sure both the numbers are zero to determine these
|
|
* transitions are not supported.
|
|
*/
|
|
if (!AcpiGbl_FADT.AcpiEnable && !AcpiGbl_FADT.AcpiDisable)
|
|
{
|
|
ACPI_ERROR ((AE_INFO,
|
|
"No ACPI mode transition supported in this system "
|
|
"(enable/disable both zero)"));
|
|
return_ACPI_STATUS (AE_OK);
|
|
}
|
|
|
|
switch (Mode)
|
|
{
|
|
case ACPI_SYS_MODE_ACPI:
|
|
|
|
/* BIOS should have disabled ALL fixed and GP events */
|
|
|
|
Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand,
|
|
(UINT32) AcpiGbl_FADT.AcpiEnable, 8);
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Attempting to enable ACPI mode\n"));
|
|
break;
|
|
|
|
case ACPI_SYS_MODE_LEGACY:
|
|
|
|
/*
|
|
* BIOS should clear all fixed status bits and restore fixed event
|
|
* enable bits to default
|
|
*/
|
|
Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand,
|
|
(UINT32) AcpiGbl_FADT.AcpiDisable, 8);
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
|
|
"Attempting to enable Legacy (non-ACPI) mode\n"));
|
|
break;
|
|
|
|
default:
|
|
return_ACPI_STATUS (AE_BAD_PARAMETER);
|
|
}
|
|
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
ACPI_EXCEPTION ((AE_INFO, Status,
|
|
"Could not write ACPI mode change"));
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
/*
|
|
* Some hardware takes a LONG time to switch modes. Give them 3 sec to
|
|
* do so, but allow faster systems to proceed more quickly.
|
|
*/
|
|
Retry = 3000;
|
|
while (Retry)
|
|
{
|
|
if (AcpiHwGetMode() == Mode)
|
|
{
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Mode %X successfully enabled\n",
|
|
Mode));
|
|
return_ACPI_STATUS (AE_OK);
|
|
}
|
|
AcpiOsStall(1000);
|
|
Retry--;
|
|
}
|
|
|
|
ACPI_ERROR ((AE_INFO, "Hardware did not change modes"));
|
|
return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
|
|
}
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiHwGetMode
|
|
*
|
|
* PARAMETERS: none
|
|
*
|
|
* RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY
|
|
*
|
|
* DESCRIPTION: Return current operating state of system. Determined by
|
|
* querying the SCI_EN bit.
|
|
*
|
|
******************************************************************************/
|
|
|
|
UINT32
|
|
AcpiHwGetMode (
|
|
void)
|
|
{
|
|
ACPI_STATUS Status;
|
|
UINT32 Value;
|
|
|
|
|
|
ACPI_FUNCTION_TRACE (HwGetMode);
|
|
|
|
|
|
/*
|
|
* ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
|
|
* system does not support mode transition.
|
|
*/
|
|
if (!AcpiGbl_FADT.SmiCommand)
|
|
{
|
|
return_UINT32 (ACPI_SYS_MODE_ACPI);
|
|
}
|
|
|
|
Status = AcpiReadBitRegister (ACPI_BITREG_SCI_ENABLE, &Value);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return_UINT32 (ACPI_SYS_MODE_LEGACY);
|
|
}
|
|
|
|
if (Value)
|
|
{
|
|
return_UINT32 (ACPI_SYS_MODE_ACPI);
|
|
}
|
|
else
|
|
{
|
|
return_UINT32 (ACPI_SYS_MODE_LEGACY);
|
|
}
|
|
}
|
|
|
|
#endif /* !ACPI_REDUCED_HARDWARE */
|