/** @file

Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#ifndef __SILICON_REG_ACCESS_PPI_H__
#define __SILICON_REG_ACCESS_PPI_H__

#include <UsraAccessType.h>

extern EFI_GUID gUsraPpiGuid;

/**
  This API Perform 8-bit, 16-bit, 32-bit or 64-bit silicon register read operations.
  It transfers data from a register into a naturally aligned data buffer.

  @param[in] Address              A pointer of the address of the USRA Address Structure to be read out
  @param[in] Buffer               A pointer of buffer for the value read from the register

  @retval NULL                    The function completed successfully.
  @retval <>NULL                  Return Error
**/
typedef
INTN
(EFIAPI *USRA_PPI_REG_READ)(
  IN USRA_ADDRESS             *Address,
  OUT VOID                    *Buffer
  );

/**
  This API Perform 8-bit, 16-bit, 32-bit or 64-bit silicon register write operations.
  It transfers data from a naturally aligned data buffer into a silicon register.

  @param[in] Address              A pointer of the address of the USRA Address Structure to be written
  @param[in] Buffer               A pointer of buffer for the value write to the register

  @retval NULL                    The function completed successfully.
  @retval <>NULL                  Return Error
**/
typedef
INTN
(EFIAPI *USRA_PPI_REG_WRITE)(
  IN USRA_ADDRESS             *Address,
  IN VOID                     *Buffer
  );

/**
  This API Perform 8-bit, 16-bit, 32-bit or 64-bit silicon register AND then OR operations. It read data from a
  register, And it with the AndBuffer, then Or it with the OrBuffer, and write the result back to the register

  @param[in] Address              A pointer of the address of the silicon register to be written
  @param[in] AndBuffer            A pointer of buffer for the value used for AND operation
                                  A NULL pointer means no AND operation. RegisterModify() equivalents to RegisterOr()
  @param[in] OrBuffer             A pointer of buffer for the value used for OR operation
                                  A NULL pointer means no OR operation. RegisterModify() equivalents to RegisterAnd()

  @retval NULL                    The function completed successfully.
  @retval <>NULL                  Return Error
**/
typedef
INTN
(EFIAPI *USRA_PPI_REG_MODIFY)(
  IN USRA_ADDRESS             *Address,
  IN VOID                     *AndBuffer,
  IN VOID                     *OrBuffer
  );

/**
  This API get the flat address from the given USRA Address.

  @param[in] Address              A pointer of the address of the USRA Address Structure to be read out

  @retval                         The flat address
**/
typedef
INTN
(EFIAPI *USRA_PPI_GET_ADDR)(
  IN USRA_ADDRESS              *Address
  );

///
/// This service abstracts the ability to read/write silicon register.
///
typedef struct {
  USRA_PPI_REG_READ            RegRead;
  USRA_PPI_REG_WRITE           RegWrite;

  USRA_PPI_REG_MODIFY          RegModify;
  USRA_PPI_GET_ADDR            GetRegAddr;
} USRA_PPI;

/**
  This API Perform 8-bit, 16-bit, 32-bit or 64-bit silicon register read operations.
  It transfers data from a register into a naturally aligned data buffer.

  @param[in] Address              A pointer of the address of the USRA Address Structure to be read out
  @param[in] Buffer               A pointer of buffer for the value read from the register

  @retval NULL                    The function completed successfully.
  @retval <>NULL                  Return Error
**/
INTN
EFIAPI
PeiRegRead (
  IN USRA_ADDRESS             *Address,
  IN VOID                     *Buffer
  );

/**
  This API Perform 8-bit, 16-bit, 32-bit or 64-bit silicon register write operations.
  It transfers data from a naturally aligned data buffer into a silicon register.

  @param[in] Address              A pointer of the address of the USRA Address Structure to be written
  @param[in] Buffer               A pointer of buffer for the value write to the register

  @retval NULL                    The function completed successfully.
  @retval <>NULL                  Return Error
**/
INTN
EFIAPI
PeiRegWrite (
  IN USRA_ADDRESS             *Address,
  IN VOID                     *Buffer
  );

/**
  This API Perform 8-bit, 16-bit, 32-bit or 64-bit Pcie silicon register AND then OR operations. It read data from a
  register, And it with the AndBuffer, then Or it with the OrBuffer, and write the result back to the register

  @param[in] Address              A pointer of the address of the silicon register to be written
  @param[in] AndBuffer            A pointer of buffer for the value used for AND operation
                                  A NULL pointer means no AND operation. RegisterModify() equivalents to RegisterOr()
  @param[in] OrBuffer             A pointer of buffer for the value used for OR operation
                                  A NULL pointer means no OR operation. RegisterModify() equivalents to RegisterAnd()

  @retval NULL                    The function completed successfully.
  @retval <>NULL                  Return Error
**/
INTN
EFIAPI
PeiRegModify (
  IN USRA_ADDRESS             *Address,
  IN VOID                     *AndBuffer,
  IN VOID                     *OrBuffer
  );

/**
  This API get the flat address from the given USRA Address.

  @param[in] Address              A pointer of the address of the USRA Address Structure to be read out

  @retval                         The flat address
**/
INTN
EFIAPI
PeiGetRegAddr (
  IN USRA_ADDRESS             *Address
  );

#endif