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/******************************************************************************
*
* Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2025, 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 MERCHANTABILITY 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.
*/
#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);
/* If the Hardware Reduced flag is set, machine is always in acpi mode */
if (AcpiGbl_ReducedHardware)
{
return_ACPI_STATUS (AE_OK);
}
/*
* 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 (ACPI_USEC_PER_MSEC);
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);
/* If the Hardware Reduced flag is set, machine is always in acpi mode */
if (AcpiGbl_ReducedHardware)
{
return_UINT32 (ACPI_SYS_MODE_ACPI);
}
/*
* 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 */
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