mirror of https://github.com/acidanthera/audk.git
84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
/*++
|
|
|
|
Copyright (c) 2006, Intel Corporation
|
|
All rights reserved. This program and the accompanying materials
|
|
are licensed and made available under the terms and conditions of the BSD License
|
|
which accompanies this distribution. The full text of the license may be found at
|
|
http://opensource.org/licenses/bsd-license.php
|
|
|
|
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
|
|
|
|
Module Name:
|
|
|
|
PciPowerManagement.c
|
|
|
|
Abstract:
|
|
|
|
PCI Bus Driver
|
|
|
|
Revision History
|
|
|
|
--*/
|
|
|
|
#include "pcibus.h"
|
|
|
|
EFI_STATUS
|
|
ResetPowerManagementFeature (
|
|
IN PCI_IO_DEVICE *PciIoDevice
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This function is intended to turn off PWE assertion and
|
|
put the device to D0 state if the device supports
|
|
PCI Power Management.
|
|
|
|
Arguments:
|
|
|
|
Returns:
|
|
|
|
None
|
|
|
|
--*/
|
|
// TODO: PciIoDevice - add argument and description to function comment
|
|
// TODO: EFI_UNSUPPORTED - add return value to function comment
|
|
// TODO: EFI_SUCCESS - add return value to function comment
|
|
{
|
|
EFI_STATUS Status;
|
|
UINT8 PowerManagementRegBlock;
|
|
UINT16 PMCSR;
|
|
|
|
PowerManagementRegBlock = 0;
|
|
|
|
Status = LocateCapabilityRegBlock (
|
|
PciIoDevice,
|
|
EFI_PCI_CAPABILITY_ID_PMI,
|
|
&PowerManagementRegBlock,
|
|
NULL
|
|
);
|
|
|
|
if (EFI_ERROR (Status)) {
|
|
return EFI_UNSUPPORTED;
|
|
}
|
|
|
|
//
|
|
// Turn off the PWE assertion and put the device into D0 State
|
|
//
|
|
PMCSR = 0x8000;
|
|
|
|
//
|
|
// Write PMCSR
|
|
//
|
|
PciIoDevice->PciIo.Pci.Write (
|
|
&PciIoDevice->PciIo,
|
|
EfiPciIoWidthUint16,
|
|
PowerManagementRegBlock + 4,
|
|
1,
|
|
&PMCSR
|
|
);
|
|
|
|
return EFI_SUCCESS;
|
|
}
|