freebsd-dev/sys/contrib/dev/acpica/hwacpi.c

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/******************************************************************************
*
* Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
* $Revision: 53 $
*
*****************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2002, 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.
*
*****************************************************************************/
#define __HWACPI_C__
#include "acpi.h"
#include "achware.h"
#define _COMPONENT ACPI_HARDWARE
ACPI_MODULE_NAME ("hwacpi")
/******************************************************************************
*
* FUNCTION: AcpiHwInitialize
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Initialize and validate various ACPI registers
*
******************************************************************************/
ACPI_STATUS
AcpiHwInitialize (
void)
{
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE ("HwInitialize");
/* We must have the ACPI tables by the time we get here */
if (!AcpiGbl_FADT)
{
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "A FADT is not loaded\n"));
return_ACPI_STATUS (AE_NO_ACPI_TABLES);
}
/* Sanity check the FADT for valid values */
Status = AcpiUtValidateFadt ();
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
return_ACPI_STATUS (AE_OK);
}
/******************************************************************************
*
* 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 = AE_NO_HARDWARE_RESPONSE;
ACPI_FUNCTION_TRACE ("HwSetMode");
if (Mode == ACPI_SYS_MODE_ACPI)
{
/* BIOS should have disabled ALL fixed and GP events */
AcpiOsWritePort (AcpiGbl_FADT->SmiCmd, AcpiGbl_FADT->AcpiEnable, 8);
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Attempting to enable ACPI mode\n"));
}
else if (Mode == ACPI_SYS_MODE_LEGACY)
{
/*
* BIOS should clear all fixed status bits and restore fixed event
* enable bits to default
*/
AcpiOsWritePort (AcpiGbl_FADT->SmiCmd, AcpiGbl_FADT->AcpiDisable, 8);
ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
"Attempting to enable Legacy (non-ACPI) mode\n"));
}
/* Give the platform some time to react */
AcpiOsStall (20000);
if (AcpiHwGetMode () == Mode)
{
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Mode %X successfully enabled\n", Mode));
Status = AE_OK;
}
return_ACPI_STATUS (Status);
}
/******************************************************************************
*
* 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_FUNCTION_TRACE ("HwGetMode");
if (AcpiHwBitRegisterRead (ACPI_BITREG_SCI_ENABLE, ACPI_MTX_LOCK))
{
return_VALUE (ACPI_SYS_MODE_ACPI);
}
else
{
return_VALUE (ACPI_SYS_MODE_LEGACY);
}
}