/** @file
  TIS (TPM Interface Specification) functions used by TPM1.2.
  
Copyright (c) 2013 - 2016, Intel Corporation. All rights reserved.<BR>
(C) Copyright 2015 Hewlett Packard Enterprise Development LP<BR>
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.

**/

#include <Uefi.h>
#include <IndustryStandard/Tpm12.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/IoLib.h>
#include <Library/TimerLib.h>
#include <Library/DebugLib.h>
#include <Library/Tpm12CommandLib.h>
#include <Library/PcdLib.h>

#include <IndustryStandard/TpmPtp.h>
#include <IndustryStandard/TpmTis.h>

typedef enum {
  PtpInterfaceTis,
  PtpInterfaceFifo,
  PtpInterfaceCrb,
  PtpInterfaceMax,
} PTP_INTERFACE_TYPE;

//
// Max TPM command/reponse length
//
#define TPMCMDBUFLENGTH             1024

/**
  Check whether TPM chip exist.

  @param[in] TisReg  Pointer to TIS register.

  @retval    TRUE    TPM chip exists.
  @retval    FALSE   TPM chip is not found.
**/
BOOLEAN
Tpm12TisPcPresenceCheck (
  IN      TIS_PC_REGISTERS_PTR      TisReg
  )
{
  UINT8                             RegRead;
  
  RegRead = MmioRead8 ((UINTN)&TisReg->Access);
  return (BOOLEAN)(RegRead != (UINT8)-1);
}

/**
  Return PTP interface type.

  @param[in] Register                Pointer to PTP register.

  @return PTP interface type.
**/
PTP_INTERFACE_TYPE
Tpm12GetPtpInterface (
  IN VOID *Register
  )
{
  PTP_CRB_INTERFACE_IDENTIFIER  InterfaceId;
  PTP_FIFO_INTERFACE_CAPABILITY InterfaceCapability;

  if (!Tpm12TisPcPresenceCheck (Register)) {
    return PtpInterfaceMax;
  }
  //
  // Check interface id
  //
  InterfaceId.Uint32 = MmioRead32 ((UINTN)&((PTP_CRB_REGISTERS *)Register)->InterfaceId);
  InterfaceCapability.Uint32 = MmioRead32 ((UINTN)&((PTP_FIFO_REGISTERS *)Register)->InterfaceCapability);

  if ((InterfaceId.Bits.InterfaceType == PTP_INTERFACE_IDENTIFIER_INTERFACE_TYPE_CRB) &&
      (InterfaceId.Bits.InterfaceVersion == PTP_INTERFACE_IDENTIFIER_INTERFACE_VERSION_CRB) &&
      (InterfaceId.Bits.CapCRB != 0)) {
    return PtpInterfaceCrb;
  }
  if ((InterfaceId.Bits.InterfaceType == PTP_INTERFACE_IDENTIFIER_INTERFACE_TYPE_FIFO) &&
      (InterfaceId.Bits.InterfaceVersion == PTP_INTERFACE_IDENTIFIER_INTERFACE_VERSION_FIFO) &&
      (InterfaceId.Bits.CapFIFO != 0) &&
      (InterfaceCapability.Bits.InterfaceVersion == INTERFACE_CAPABILITY_INTERFACE_VERSION_PTP)) {
    return PtpInterfaceFifo;
  }
  return PtpInterfaceTis;
}

/**
  Check whether the value of a TPM chip register satisfies the input BIT setting.

  @param[in]  Register     Address port of register to be checked.
  @param[in]  BitSet       Check these data bits are set.
  @param[in]  BitClear     Check these data bits are clear.
  @param[in]  TimeOut      The max wait time (unit MicroSecond) when checking register.

  @retval     EFI_SUCCESS  The register satisfies the check bit.
  @retval     EFI_TIMEOUT  The register can't run into the expected status in time.
**/
EFI_STATUS
Tpm12TisPcWaitRegisterBits (
  IN      UINT8                     *Register,
  IN      UINT8                     BitSet,
  IN      UINT8                     BitClear,
  IN      UINT32                    TimeOut
  )
{
  UINT8                             RegRead;
  UINT32                            WaitTime;

  for (WaitTime = 0; WaitTime < TimeOut; WaitTime += 30){
    RegRead = MmioRead8 ((UINTN)Register);
    if ((RegRead & BitSet) == BitSet && (RegRead & BitClear) == 0)
      return EFI_SUCCESS;
    MicroSecondDelay (30);
  }
  return EFI_TIMEOUT;
}

/**
  Get BurstCount by reading the burstCount field of a TIS regiger 
  in the time of default TIS_TIMEOUT_D.

  @param[in]  TisReg                Pointer to TIS register.
  @param[out] BurstCount            Pointer to a buffer to store the got BurstConut.

  @retval     EFI_SUCCESS           Get BurstCount.
  @retval     EFI_INVALID_PARAMETER TisReg is NULL or BurstCount is NULL.
  @retval     EFI_TIMEOUT           BurstCount can't be got in time.
**/
EFI_STATUS
Tpm12TisPcReadBurstCount (
  IN      TIS_PC_REGISTERS_PTR      TisReg,
     OUT  UINT16                    *BurstCount
  )
{
  UINT32                            WaitTime;
  UINT8                             DataByte0;
  UINT8                             DataByte1;

  if (BurstCount == NULL || TisReg == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  WaitTime = 0;
  do {
    //
    // TIS_PC_REGISTERS_PTR->burstCount is UINT16, but it is not 2bytes aligned,
    // so it needs to use MmioRead8 to read two times
    //
    DataByte0   = MmioRead8 ((UINTN)&TisReg->BurstCount);
    DataByte1   = MmioRead8 ((UINTN)&TisReg->BurstCount + 1);
    *BurstCount = (UINT16)((DataByte1 << 8) + DataByte0);
    if (*BurstCount != 0) {
      return EFI_SUCCESS;
    }
    MicroSecondDelay (30);
    WaitTime += 30;
  } while (WaitTime < TIS_TIMEOUT_D);

  return EFI_TIMEOUT;
}

/**
  Set TPM chip to ready state by sending ready command TIS_PC_STS_READY 
  to Status Register in time.

  @param[in] TisReg                Pointer to TIS register.

  @retval    EFI_SUCCESS           TPM chip enters into ready state.
  @retval    EFI_INVALID_PARAMETER TisReg is NULL.
  @retval    EFI_TIMEOUT           TPM chip can't be set to ready state in time.
**/
EFI_STATUS
Tpm12TisPcPrepareCommand (
  IN      TIS_PC_REGISTERS_PTR      TisReg
  )
{
  EFI_STATUS                        Status;

  if (TisReg == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  MmioWrite8((UINTN)&TisReg->Status, TIS_PC_STS_READY);
  Status = Tpm12TisPcWaitRegisterBits (
             &TisReg->Status,
             TIS_PC_STS_READY,
             0,
             TIS_TIMEOUT_B
             );
  return Status;
}

/**
  Get the control of TPM chip by sending requestUse command TIS_PC_ACC_RQUUSE 
  to ACCESS Register in the time of default TIS_TIMEOUT_A.

  @param[in] TisReg                Pointer to TIS register.

  @retval    EFI_SUCCESS           Get the control of TPM chip.
  @retval    EFI_INVALID_PARAMETER TisReg is NULL.
  @retval    EFI_NOT_FOUND         TPM chip doesn't exit.
  @retval    EFI_TIMEOUT           Can't get the TPM control in time.
**/
EFI_STATUS
Tpm12TisPcRequestUseTpm (
  IN      TIS_PC_REGISTERS_PTR      TisReg
  )
{
  EFI_STATUS                        Status;
  
  if (TisReg == NULL) {
    return EFI_INVALID_PARAMETER;
  }
  
  if (!Tpm12TisPcPresenceCheck (TisReg)) {
    return EFI_NOT_FOUND;
  }

  MmioWrite8((UINTN)&TisReg->Access, TIS_PC_ACC_RQUUSE);
  Status = Tpm12TisPcWaitRegisterBits (
             &TisReg->Access,
             (UINT8)(TIS_PC_ACC_ACTIVE |TIS_PC_VALID),
             0,
             TIS_TIMEOUT_A
             );
  return Status;
}

/**
  Send a command to TPM for execution and return response data.

  @param[in]      TisReg        TPM register space base address.  
  @param[in]      BufferIn      Buffer for command data.  
  @param[in]      SizeIn        Size of command data.  
  @param[in, out] BufferOut     Buffer for response data.  
  @param[in, out] SizeOut       Size of response data.  
 
  @retval EFI_SUCCESS           Operation completed successfully.
  @retval EFI_BUFFER_TOO_SMALL  Response data buffer is too small.
  @retval EFI_DEVICE_ERROR      Unexpected device behavior.
  @retval EFI_UNSUPPORTED       Unsupported TPM version

**/
EFI_STATUS
Tpm12TisTpmCommand (
  IN     TIS_PC_REGISTERS_PTR       TisReg,
  IN     UINT8                      *BufferIn,
  IN     UINT32                     SizeIn,
  IN OUT UINT8                      *BufferOut,
  IN OUT UINT32                     *SizeOut
  )
{
  EFI_STATUS                        Status;
  UINT16                            BurstCount;
  UINT32                            Index;
  UINT32                            TpmOutSize;
  UINT16                            Data16;
  UINT32                            Data32;
  UINT16                            RspTag;

  DEBUG_CODE (
    UINTN  DebugSize;

    DEBUG ((EFI_D_VERBOSE, "Tpm12TisTpmCommand Send - "));
    if (SizeIn > 0x100) {
      DebugSize = 0x40;
    } else {
      DebugSize = SizeIn;
    }
    for (Index = 0; Index < DebugSize; Index++) {
      DEBUG ((EFI_D_VERBOSE, "%02x ", BufferIn[Index]));
    }
    if (DebugSize != SizeIn) {
      DEBUG ((EFI_D_VERBOSE, "...... "));
      for (Index = SizeIn - 0x20; Index < SizeIn; Index++) {
        DEBUG ((EFI_D_VERBOSE, "%02x ", BufferIn[Index]));
      }
    }
    DEBUG ((EFI_D_VERBOSE, "\n"));
  );
  TpmOutSize = 0;

  Status = Tpm12TisPcPrepareCommand (TisReg);
  if (EFI_ERROR (Status)){
    DEBUG ((DEBUG_ERROR, "Tpm12 is not ready for command!\n"));
    return EFI_DEVICE_ERROR;
  }
  //
  // Send the command data to Tpm
  //
  Index = 0;
  while (Index < SizeIn) {
    Status = Tpm12TisPcReadBurstCount (TisReg, &BurstCount);
    if (EFI_ERROR (Status)) {
      Status = EFI_DEVICE_ERROR;
      goto Exit;
    }
    for (; BurstCount > 0 && Index < SizeIn; BurstCount--) {
      MmioWrite8((UINTN)&TisReg->DataFifo, *(BufferIn + Index));
      Index++;
    }
  }
  //
  // Check the Tpm status STS_EXPECT change from 1 to 0
  //
  Status = Tpm12TisPcWaitRegisterBits (
             &TisReg->Status,
             (UINT8) TIS_PC_VALID,
             TIS_PC_STS_EXPECT,
             TIS_TIMEOUT_C
             );
  if (EFI_ERROR (Status)) {
    DEBUG ((DEBUG_ERROR, "Tpm12 The send buffer too small!\n"));
    Status = EFI_BUFFER_TOO_SMALL;
    goto Exit;
  }
  //
  // Executed the TPM command and waiting for the response data ready
  //
  MmioWrite8((UINTN)&TisReg->Status, TIS_PC_STS_GO);
  Status = Tpm12TisPcWaitRegisterBits (
             &TisReg->Status,
             (UINT8) (TIS_PC_VALID | TIS_PC_STS_DATA),
             0,
             TIS_TIMEOUT_B
             );
  if (EFI_ERROR (Status)) {
    DEBUG ((DEBUG_ERROR, "Wait for Tpm12 response data time out!!\n"));
    Status = EFI_DEVICE_ERROR;
    goto Exit;
  }
  //
  // Get response data header
  //
  Index = 0;
  BurstCount = 0;
  while (Index < sizeof (TPM_RSP_COMMAND_HDR)) {
    Status = Tpm12TisPcReadBurstCount (TisReg, &BurstCount);
    if (EFI_ERROR (Status)) {
      Status = EFI_DEVICE_ERROR;
      goto Exit;
    }
    for (; BurstCount > 0; BurstCount--) {
      *(BufferOut + Index) = MmioRead8 ((UINTN)&TisReg->DataFifo);
      Index++;
      if (Index == sizeof (TPM_RSP_COMMAND_HDR)) break;
    }
  }
  DEBUG_CODE (
    DEBUG ((EFI_D_VERBOSE, "Tpm12TisTpmCommand ReceiveHeader - "));
    for (Index = 0; Index < sizeof (TPM_RSP_COMMAND_HDR); Index++) {
      DEBUG ((EFI_D_VERBOSE, "%02x ", BufferOut[Index]));
    }
    DEBUG ((EFI_D_VERBOSE, "\n"));
  );
  //
  // Check the response data header (tag, parasize and returncode)
  //
  CopyMem (&Data16, BufferOut, sizeof (UINT16));
  RspTag = SwapBytes16 (Data16);
  if (RspTag != TPM_TAG_RSP_COMMAND && RspTag != TPM_TAG_RSP_AUTH1_COMMAND && RspTag != TPM_TAG_RSP_AUTH2_COMMAND) {
    DEBUG ((EFI_D_ERROR, "TPM12: Response tag error - current tag value is %x\n", RspTag));
    Status = EFI_UNSUPPORTED;
    goto Exit;
  }

  CopyMem (&Data32, (BufferOut + 2), sizeof (UINT32));
  TpmOutSize  = SwapBytes32 (Data32);
  if (*SizeOut < TpmOutSize) {
    Status = EFI_BUFFER_TOO_SMALL;
    goto Exit;
  }
  *SizeOut = TpmOutSize;
  //
  // Continue reading the remaining data
  //
  while ( Index < TpmOutSize ) {
    for (; BurstCount > 0; BurstCount--) {
      *(BufferOut + Index) = MmioRead8 ((UINTN)&TisReg->DataFifo);
      Index++;
      if (Index == TpmOutSize) {
        Status = EFI_SUCCESS;
        goto Exit;
      }
    }
    Status = Tpm12TisPcReadBurstCount (TisReg, &BurstCount);
    if (EFI_ERROR (Status)) {
      Status = EFI_DEVICE_ERROR;
      goto Exit;
    }
  }
Exit:
  DEBUG_CODE (
    DEBUG ((EFI_D_VERBOSE, "Tpm12TisTpmCommand Receive - "));
    for (Index = 0; Index < TpmOutSize; Index++) {
      DEBUG ((EFI_D_VERBOSE, "%02x ", BufferOut[Index]));
    }
    DEBUG ((EFI_D_VERBOSE, "\n"));
  );
  MmioWrite8((UINTN)&TisReg->Status, TIS_PC_STS_READY);
  return Status;
}

/**
  This service enables the sending of commands to the TPM12.

  @param[in]      InputParameterBlockSize  Size of the TPM12 input parameter block.
  @param[in]      InputParameterBlock      Pointer to the TPM12 input parameter block.
  @param[in,out]  OutputParameterBlockSize Size of the TPM12 output parameter block.
  @param[in]      OutputParameterBlock     Pointer to the TPM12 output parameter block.

  @retval EFI_SUCCESS            The command byte stream was successfully sent to the device and a response was successfully received.
  @retval EFI_DEVICE_ERROR       The command was not successfully sent to the device or a response was not successfully received from the device.
  @retval EFI_BUFFER_TOO_SMALL   The output parameter block is too small. 
**/
EFI_STATUS
EFIAPI
Tpm12SubmitCommand (
  IN UINT32            InputParameterBlockSize,
  IN UINT8             *InputParameterBlock,
  IN OUT UINT32        *OutputParameterBlockSize,
  IN UINT8             *OutputParameterBlock
  )
{
  PTP_INTERFACE_TYPE  PtpInterface;

  //
  // Special handle for TPM1.2 to check PTP too, because PTP/TIS share same register address.
  //
  PtpInterface = Tpm12GetPtpInterface ((VOID *) (UINTN) PcdGet64 (PcdTpmBaseAddress));
  switch (PtpInterface) {
  case PtpInterfaceFifo:
  case PtpInterfaceTis:
    return Tpm12TisTpmCommand (
             (TIS_PC_REGISTERS_PTR) (UINTN) PcdGet64 (PcdTpmBaseAddress),
             InputParameterBlock,
             InputParameterBlockSize,
             OutputParameterBlock,
             OutputParameterBlockSize
             );
  case PtpInterfaceCrb:
    //
    // No need to support CRB because it is only accept TPM2 command.
    //
  default:
    return EFI_DEVICE_ERROR;
  }

}

/**
  Check whether the value of a TPM chip register satisfies the input BIT setting.

  @param[in]  Register     Address port of register to be checked.
  @param[in]  BitSet       Check these data bits are set.
  @param[in]  BitClear     Check these data bits are clear.
  @param[in]  TimeOut      The max wait time (unit MicroSecond) when checking register.

  @retval     EFI_SUCCESS  The register satisfies the check bit.
  @retval     EFI_TIMEOUT  The register can't run into the expected status in time.
**/
EFI_STATUS
Tpm12PtpCrbWaitRegisterBits (
  IN      UINT32                    *Register,
  IN      UINT32                    BitSet,
  IN      UINT32                    BitClear,
  IN      UINT32                    TimeOut
  )
{
  UINT32                            RegRead;
  UINT32                            WaitTime;

  for (WaitTime = 0; WaitTime < TimeOut; WaitTime += 30){
    RegRead = MmioRead32 ((UINTN)Register);
    if ((RegRead & BitSet) == BitSet && (RegRead & BitClear) == 0) {
      return EFI_SUCCESS;
    }
    MicroSecondDelay (30);
  }
  return EFI_TIMEOUT;
}

/**
  Get the control of TPM chip.

  @param[in] CrbReg                Pointer to CRB register.

  @retval    EFI_SUCCESS           Get the control of TPM chip.
  @retval    EFI_INVALID_PARAMETER CrbReg is NULL.
  @retval    EFI_NOT_FOUND         TPM chip doesn't exit.
  @retval    EFI_TIMEOUT           Can't get the TPM control in time.
**/
EFI_STATUS
Tpm12PtpCrbRequestUseTpm (
  IN      PTP_CRB_REGISTERS_PTR      CrbReg
  )
{
  EFI_STATUS                        Status;

  MmioWrite32((UINTN)&CrbReg->LocalityControl, PTP_CRB_LOCALITY_CONTROL_REQUEST_ACCESS);
  Status = Tpm12PtpCrbWaitRegisterBits (
             &CrbReg->LocalityStatus,
             PTP_CRB_LOCALITY_STATUS_GRANTED,
             0,
             PTP_TIMEOUT_A
             );
  return Status;
}

/**
  This service requests use TPM12.

  @retval EFI_SUCCESS      Get the control of TPM12 chip.
  @retval EFI_NOT_FOUND    TPM12 not found.
  @retval EFI_DEVICE_ERROR Unexpected device behavior.
**/
EFI_STATUS
EFIAPI
Tpm12RequestUseTpm (
  VOID
  )
{
  PTP_INTERFACE_TYPE  PtpInterface;

  //
  // Special handle for TPM1.2 to check PTP too, because PTP/TIS share same register address.
  // Some other program might leverage this function to check the existence of TPM chip.
  //
  PtpInterface = Tpm12GetPtpInterface ((VOID *) (UINTN) PcdGet64 (PcdTpmBaseAddress));
  switch (PtpInterface) {
  case PtpInterfaceCrb:
    return Tpm12PtpCrbRequestUseTpm ((PTP_CRB_REGISTERS_PTR) (UINTN) PcdGet64 (PcdTpmBaseAddress));
  case PtpInterfaceFifo:
  case PtpInterfaceTis:
    return Tpm12TisPcRequestUseTpm ((TIS_PC_REGISTERS_PTR) (UINTN) PcdGet64 (PcdTpmBaseAddress));
  default:
    return EFI_NOT_FOUND;
  }
}