/** @file

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

**/

#include "UsraAccessLib.h"

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

  @param[in] Global               Global pointer
  @param[in] Virtual              Virtual address
  @param[in] Address              A pointer of the address of the USRA Address Structure
  @param[out] AlignedAddress      A pointer of aligned address converted from USRA address

  @retval NONE
**/
VOID
GetCsrAccessAddress (
  IN VOID                     *Global,
  IN BOOLEAN                  Virtual,
  IN USRA_ADDRESS             *Address,
  OUT UINTN                   *AlignedAddress
  )
{
  CsrGetPcieAlignAddress (Global, Virtual, Address, AlignedAddress);
}

/**
  This API performs 8-bit, 16-bit, 32-bit or 64-bit CSR 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 RETURN_SUCCESS          The function completed successfully.
**/
RETURN_STATUS
CsrRegisterRead (
  IN USRA_ADDRESS             *Address,
  IN VOID                     *Buffer
  )
{
  UINTN                       AlignedAddress = 0;

  GetCsrAccessAddress (NULL, 0, Address, &AlignedAddress);

    UsraRegAlignedRead((UINT32)Address->Attribute.AccessWidth, AlignedAddress, Buffer);

  return RETURN_SUCCESS;
}

/**
  This API performs 8-bit, 16-bit, 32-bit or 64-bit CSR silicon register write operations.
  It transfers data from a naturally aligned data buffer into a 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 RETURN_SUCCESS          The function completed successfully.
**/
RETURN_STATUS
CsrRegisterWrite (
  IN USRA_ADDRESS             *Address,
  OUT VOID                    *Buffer
  )
{
  UINTN                       AlignedAddress = 0;

  GetCsrAccessAddress (NULL, 0, Address, &AlignedAddress);

    UsraRegAlignedWrite((UINT32)Address->Attribute.AccessWidth, AlignedAddress, Buffer);

  if (FeaturePcdGet (PcdUsraSupportS3))
  {
    if(Address->Attribute.S3Enable)
    {
      S3BootScriptSaveMemWrite ((S3_BOOT_SCRIPT_LIB_WIDTH)Address->Attribute.AccessWidth, (UINT64)AlignedAddress, 1, Buffer);
    }
  }

  return RETURN_SUCCESS;
}

/**
  This API performs 8-bit, 16-bit, 32-bit or 64-bit CSR 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 RETURN_SUCCESS          The function completed successfully.
**/
RETURN_STATUS
CsrRegisterModify (
  IN USRA_ADDRESS             *Address,
  IN VOID                     *AndBuffer,
  IN VOID                     *OrBuffer
  )
{

  UINT64                      Data;
  UINT8                       WidthTable[] = {1,2,4,8};
  UINTN                       AlignedAddress = 0;

  GetCsrAccessAddress (NULL, 0, Address, &AlignedAddress);

    UsraRegAlignedRead((UINT32)Address->Attribute.AccessWidth, AlignedAddress, &Data);
    DataAndOr (&Data, AndBuffer, OrBuffer, WidthTable[(UINT8)Address->Attribute.AccessWidth]);
    UsraRegAlignedWrite((UINT32)Address->Attribute.AccessWidth, AlignedAddress, &Data);

  return RETURN_SUCCESS;
}