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/** @file
This driver installs Single Segment Pci Configuration 2 PPI
to provide read, write and modify access to Pci configuration space in PEI phase.
To follow PI specification, these services also support access to the unaligned Pci address.
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiPei.h>
#include <Ppi/PciCfg2.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/PciLib.h>
#include <Library/PeimEntryPoint.h>
#include <Library/PeiServicesLib.h>
#include <IndustryStandard/Pci.h>
/**
Convert EFI_PEI_PCI_CFG_PPI_PCI_ADDRESS to PCI_LIB_ADDRESS.
@param Address PCI address with EFI_PEI_PCI_CFG_PPI_PCI_ADDRESS format.
@return PCI address with PCI_LIB_ADDRESS format.
**/
UINTN
PciCfgAddressConvert (
EFI_PEI_PCI_CFG_PPI_PCI_ADDRESS *Address
)
{
if (Address->ExtendedRegister == 0) {
return PCI_LIB_ADDRESS (Address->Bus, Address->Device, Address->Function, Address->Register);
}
return PCI_LIB_ADDRESS (Address->Bus, Address->Device, Address->Function, Address->ExtendedRegister);
}
/**
Reads from a given location in the PCI configuration space.
@param PeiServices An indirect pointer to the PEI Services Table published by the PEI Foundation.
@param This Pointer to local data for the interface.
@param Width The width of the access. Enumerated in bytes.
See EFI_PEI_PCI_CFG_PPI_WIDTH above.
@param Address The physical address of the access. The format of
the address is described by EFI_PEI_PCI_CFG_PPI_PCI_ADDRESS.
@param Buffer A pointer to the buffer of data.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_INVALID_PARAMETER The invalid access width.
**/
EFI_STATUS
EFIAPI
PciCfg2Read (
IN CONST EFI_PEI_SERVICES **PeiServices,
IN CONST EFI_PEI_PCI_CFG2_PPI *This,
IN EFI_PEI_PCI_CFG_PPI_WIDTH Width,
IN UINT64 Address,
IN OUT VOID *Buffer
)
{
UINTN PciLibAddress;
PciLibAddress = PciCfgAddressConvert ((EFI_PEI_PCI_CFG_PPI_PCI_ADDRESS *) &Address);
if (Width == EfiPeiPciCfgWidthUint8) {
*((UINT8 *) Buffer) = PciRead8 (PciLibAddress);
} else if (Width == EfiPeiPciCfgWidthUint16) {
if ((PciLibAddress & 0x01) == 0) {
//
// Aligned Pci address access
//
WriteUnaligned16 (((UINT16 *) Buffer), PciRead16 (PciLibAddress));
} else {
//
// Unaligned Pci address access, break up the request into byte by byte.
//
*((UINT8 *) Buffer) = PciRead8 (PciLibAddress);
*((UINT8 *) Buffer + 1) = PciRead8 (PciLibAddress + 1);
}
} else if (Width == EfiPeiPciCfgWidthUint32) {
if ((PciLibAddress & 0x03) == 0) {
//
// Aligned Pci address access
//
WriteUnaligned32 (((UINT32 *) Buffer), PciRead32 (PciLibAddress));
} else if ((PciLibAddress & 0x01) == 0) {
//
// Unaligned Pci address access, break up the request into word by word.
//
WriteUnaligned16 (((UINT16 *) Buffer), PciRead16 (PciLibAddress));
WriteUnaligned16 (((UINT16 *) Buffer + 1), PciRead16 (PciLibAddress + 2));
} else {
//
// Unaligned Pci address access, break up the request into byte by byte.
//
*((UINT8 *) Buffer) = PciRead8 (PciLibAddress);
*((UINT8 *) Buffer + 1) = PciRead8 (PciLibAddress + 1);
*((UINT8 *) Buffer + 2) = PciRead8 (PciLibAddress + 2);
*((UINT8 *) Buffer + 3) = PciRead8 (PciLibAddress + 3);
}
} else {
return EFI_INVALID_PARAMETER;
}
return EFI_SUCCESS;
}
/**
Write to a given location in the PCI configuration space.
@param PeiServices An indirect pointer to the PEI Services Table published by the PEI Foundation.
@param This Pointer to local data for the interface.
@param Width The width of the access. Enumerated in bytes.
See EFI_PEI_PCI_CFG_PPI_WIDTH above.
@param Address The physical address of the access. The format of
the address is described by EFI_PEI_PCI_CFG_PPI_PCI_ADDRESS.
@param Buffer A pointer to the buffer of data.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_INVALID_PARAMETER The invalid access width.
**/
EFI_STATUS
EFIAPI
PciCfg2Write (
IN CONST EFI_PEI_SERVICES **PeiServices,
IN CONST EFI_PEI_PCI_CFG2_PPI *This,
IN EFI_PEI_PCI_CFG_PPI_WIDTH Width,
IN UINT64 Address,
IN OUT VOID *Buffer
)
{
UINTN PciLibAddress;
PciLibAddress = PciCfgAddressConvert ((EFI_PEI_PCI_CFG_PPI_PCI_ADDRESS *) &Address);
if (Width == EfiPeiPciCfgWidthUint8) {
PciWrite8 (PciLibAddress, *((UINT8 *) Buffer));
} else if (Width == EfiPeiPciCfgWidthUint16) {
if ((PciLibAddress & 0x01) == 0) {
//
// Aligned Pci address access
//
PciWrite16 (PciLibAddress, ReadUnaligned16 ((UINT16 *) Buffer));
} else {
//
// Unaligned Pci address access, break up the request into byte by byte.
//
PciWrite8 (PciLibAddress, *((UINT8 *) Buffer));
PciWrite8 (PciLibAddress + 1, *((UINT8 *) Buffer + 1));
}
} else if (Width == EfiPeiPciCfgWidthUint32) {
if ((PciLibAddress & 0x03) == 0) {
//
// Aligned Pci address access
//
PciWrite32 (PciLibAddress, ReadUnaligned32 ((UINT32 *) Buffer));
} else if ((PciLibAddress & 0x01) == 0) {
//
// Unaligned Pci address access, break up the request into word by word.
//
PciWrite16 (PciLibAddress, ReadUnaligned16 ((UINT16 *) Buffer));
PciWrite16 (PciLibAddress + 2, ReadUnaligned16 ((UINT16 *) Buffer + 1));
} else {
//
// Unaligned Pci address access, break up the request into byte by byte.
//
PciWrite8 (PciLibAddress, *((UINT8 *) Buffer));
PciWrite8 (PciLibAddress + 1, *((UINT8 *) Buffer + 1));
PciWrite8 (PciLibAddress + 2, *((UINT8 *) Buffer + 2));
PciWrite8 (PciLibAddress + 3, *((UINT8 *) Buffer + 3));
}
} else {
return EFI_INVALID_PARAMETER;
}
return EFI_SUCCESS;
}
/**
This function performs a read-modify-write operation on the contents from a given
location in the PCI configuration space.
@param PeiServices An indirect pointer to the PEI Services Table
published by the PEI Foundation.
@param This Pointer to local data for the interface.
@param Width The width of the access. Enumerated in bytes. Type
EFI_PEI_PCI_CFG_PPI_WIDTH is defined in Read().
@param Address The physical address of the access.
@param SetBits Points to value to bitwise-OR with the read configuration value.
The size of the value is determined by Width.
@param ClearBits Points to the value to negate and bitwise-AND with the read configuration value.
The size of the value is determined by Width.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_INVALID_PARAMETER The invalid access width.
**/
EFI_STATUS
EFIAPI
PciCfg2Modify (
IN CONST EFI_PEI_SERVICES **PeiServices,
IN CONST EFI_PEI_PCI_CFG2_PPI *This,
IN EFI_PEI_PCI_CFG_PPI_WIDTH Width,
IN UINT64 Address,
IN VOID *SetBits,
IN VOID *ClearBits
)
{
UINTN PciLibAddress;
UINT16 ClearValue16;
UINT16 SetValue16;
UINT32 ClearValue32;
UINT32 SetValue32;
PciLibAddress = PciCfgAddressConvert ((EFI_PEI_PCI_CFG_PPI_PCI_ADDRESS *) &Address);
if (Width == EfiPeiPciCfgWidthUint8) {
PciAndThenOr8 (PciLibAddress, (UINT8) (~(*(UINT8 *) ClearBits)), *((UINT8 *) SetBits));
} else if (Width == EfiPeiPciCfgWidthUint16) {
if ((PciLibAddress & 0x01) == 0) {
//
// Aligned Pci address access
//
ClearValue16 = (UINT16) (~ReadUnaligned16 ((UINT16 *) ClearBits));
SetValue16 = ReadUnaligned16 ((UINT16 *) SetBits);
PciAndThenOr16 (PciLibAddress, ClearValue16, SetValue16);
} else {
//
// Unaligned Pci address access, break up the request into byte by byte.
//
PciAndThenOr8 (PciLibAddress, (UINT8) (~(*(UINT8 *) ClearBits)), *((UINT8 *) SetBits));
PciAndThenOr8 (PciLibAddress + 1, (UINT8) (~(*((UINT8 *) ClearBits + 1))), *((UINT8 *) SetBits + 1));
}
} else if (Width == EfiPeiPciCfgWidthUint32) {
if ((PciLibAddress & 0x03) == 0) {
//
// Aligned Pci address access
//
ClearValue32 = (UINT32) (~ReadUnaligned32 ((UINT32 *) ClearBits));
SetValue32 = ReadUnaligned32 ((UINT32 *) SetBits);
PciAndThenOr32 (PciLibAddress, ClearValue32, SetValue32);
} else if ((PciLibAddress & 0x01) == 0) {
//
// Unaligned Pci address access, break up the request into word by word.
//
ClearValue16 = (UINT16) (~ReadUnaligned16 ((UINT16 *) ClearBits));
SetValue16 = ReadUnaligned16 ((UINT16 *) SetBits);
PciAndThenOr16 (PciLibAddress, ClearValue16, SetValue16);
ClearValue16 = (UINT16) (~ReadUnaligned16 ((UINT16 *) ClearBits + 1));
SetValue16 = ReadUnaligned16 ((UINT16 *) SetBits + 1);
PciAndThenOr16 (PciLibAddress + 2, ClearValue16, SetValue16);
} else {
//
// Unaligned Pci address access, break up the request into byte by byte.
//
PciAndThenOr8 (PciLibAddress, (UINT8) (~(*(UINT8 *) ClearBits)), *((UINT8 *) SetBits));
PciAndThenOr8 (PciLibAddress + 1, (UINT8) (~(*((UINT8 *) ClearBits + 1))), *((UINT8 *) SetBits + 1));
PciAndThenOr8 (PciLibAddress + 2, (UINT8) (~(*((UINT8 *) ClearBits + 2))), *((UINT8 *) SetBits + 2));
PciAndThenOr8 (PciLibAddress + 3, (UINT8) (~(*((UINT8 *) ClearBits + 3))), *((UINT8 *) SetBits + 3));
}
} else {
return EFI_INVALID_PARAMETER;
}
return EFI_SUCCESS;
}
EFI_PEI_PCI_CFG2_PPI gPciCfg2Ppi = {
PciCfg2Read,
PciCfg2Write,
PciCfg2Modify,
0
};
EFI_PEI_PPI_DESCRIPTOR gPciCfg2PpiList = {
(EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
&gEfiPciCfg2PpiGuid,
&gPciCfg2Ppi
};
/**
Module's entry function.
This routine will install EFI_PEI_PCI_CFG2_PPI.
@param FileHandle Handle of the file being invoked.
@param PeiServices Describes the list of possible PEI Services.
@return Whether success to install service.
**/
EFI_STATUS
EFIAPI
PeimInitializePciCfg (
IN EFI_PEI_FILE_HANDLE FileHandle,
IN CONST EFI_PEI_SERVICES **PeiServices
)
{
EFI_STATUS Status;
(**(EFI_PEI_SERVICES **)PeiServices).PciCfg = &gPciCfg2Ppi;
Status = PeiServicesInstallPpi (&gPciCfg2PpiList);
ASSERT_EFI_ERROR (Status);
return Status;
}
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