/**
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
)
{
EFI_STATUS Status;
//
// Check to see if TPM exists
//
if (TpmReadByte (INFINEON_TPM_ACCESS_0_ADDRESS_DEFAULT) == 0xFF) {
return EFI_NOT_FOUND;
}
TpmWriteByte (INFINEON_TPM_ACCESS_0_ADDRESS_DEFAULT, TIS_PC_ACC_RQUUSE);
//
// No locality set before, ACCESS_X.activeLocality MUST be valid within TIMEOUT_A
//
Status = TisPcWaitRegisterBits (
INFINEON_TPM_ACCESS_0_ADDRESS_DEFAULT,
(UINT8)(TIS_PC_ACC_ACTIVE |TIS_PC_VALID),
0,
TIS_TIMEOUT_A
);
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
EFIAPI
TisPcRequestUseTpm (
IN TIS_PC_REGISTERS_PTR TisReg
)
{
EFI_STATUS Status;
if (TisReg == NULL) {
return EFI_INVALID_PARAMETER;
}
if (!TisPcPresenceCheck (TisReg)) {
return EFI_NOT_FOUND;
}
MmioWrite8((UINTN)&TisReg->Access, TIS_PC_ACC_RQUUSE);
//
// No locality set before, ACCESS_X.activeLocality MUST be valid within TIMEOUT_A
//
Status = TisPcWaitRegisterBits (
&TisReg->Access,
(UINT8)(TIS_PC_ACC_ACTIVE |TIS_PC_VALID),
0,
TIS_TIMEOUT_A
);
return Status;
}
/**
Send command to TPM for execution.
@param[in] TpmBuffer Buffer for TPM command data.
@param[in] DataLength TPM command data length.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_TIMEOUT The register can't run into the expected status in time.
**/
EFI_STATUS
TisPcSend (
IN UINT8 *TpmBuffer,
IN UINT32 DataLength
)
{
UINT16 BurstCount;
UINT32 Index;
EFI_STATUS Status;
Status = TisPcPrepareCommand ();
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "The TPM is not ready!\n"));
goto Done;
}
Index = 0;
while (Index < DataLength) {
Status = TisPcReadBurstCount (&BurstCount);
if (EFI_ERROR (Status)) {
Status = EFI_TIMEOUT;
goto Done;
}
for (; BurstCount > 0 && Index < DataLength; BurstCount--) {
TpmWriteByte (INFINEON_TPM_DATA_FIFO_0_ADDRESS_DEFAULT, *(TpmBuffer + Index));
Index++;
}
}
//
// Ensure the TPM status STS_EXPECT change from 1 to 0
//
Status = TisPcWaitRegisterBits (
INFINEON_TPM_STS_0_ADDRESS_DEFAULT,
(UINT8) TIS_PC_VALID,
TIS_PC_STS_EXPECT,
TIS_TIMEOUT_C
);
if (EFI_ERROR (Status)) {
goto Done;
}
//
// Start the command
//
TpmWriteByte (INFINEON_TPM_STS_0_ADDRESS_DEFAULT, TIS_PC_STS_GO);
Done:
if (EFI_ERROR (Status)) {
//
// Ensure the TPM state change from "Reception" to "Idle/Ready"
//
TpmWriteByte (INFINEON_TPM_STS_0_ADDRESS_DEFAULT, TIS_PC_STS_READY);
}
return Status;
}
/**
Set TPM chip to ready state by sending ready command TIS_PC_STS_READY
to Status Register in time.
@retval EFI_SUCCESS TPM chip enters into ready state.
@retval EFI_TIMEOUT TPM chip can't be set to ready state in time.
**/
EFI_STATUS
TisPcPrepareCommand (
VOID
)
{
EFI_STATUS Status;
TpmWriteByte (INFINEON_TPM_STS_0_ADDRESS_DEFAULT, TIS_PC_STS_READY);
Status = TisPcWaitRegisterBits (
INFINEON_TPM_STS_0_ADDRESS_DEFAULT,
TIS_PC_STS_READY,
0,
TIS_TIMEOUT_B
);
return Status;
}
/**
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
EFIAPI
TisPcPrepareCommand (
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 = TisPcWaitRegisterBits (
&TisReg->Status,
TIS_PC_STS_READY,
0,
TIS_TIMEOUT_B
);
return Status;
}
/**
Receive response data of last command from TPM.
@param[out] TpmBuffer Buffer for response data.
@param[out] RespSize Response data length.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_TIMEOUT The register can't run into the expected status in time.
@retval EFI_DEVICE_ERROR Unexpected device status.
@retval EFI_BUFFER_TOO_SMALL Response data is too long.
**/
EFI_STATUS
TisPcReceive (
OUT UINT8 *TpmBuffer,
OUT UINT32 *RespSize
)
{
EFI_STATUS Status;
UINT16 BurstCount;
UINT32 Index;
UINT32 ResponseSize;
TPM_RSP_COMMAND_HDR *ResponseHeader;
//
// Wait for the command completion
//
Status = TisPcWaitRegisterBits (
INFINEON_TPM_STS_0_ADDRESS_DEFAULT,
(UINT8) (TIS_PC_VALID | TIS_PC_STS_DATA),
0,
TIS_TIMEOUT_B
);
if (EFI_ERROR (Status)) {
Status = EFI_TIMEOUT;
goto Done;
}
//
// Read the response data header and check it
//
Index = 0;
BurstCount = 0;
while (Index < sizeof (TPM_RSP_COMMAND_HDR)) {
Status = TisPcReadBurstCount (&BurstCount);
if (EFI_ERROR (Status)) {
Status = EFI_TIMEOUT;
goto Done;
}
for (; BurstCount > 0 ; BurstCount--) {
*(TpmBuffer + Index) = TpmReadByte (INFINEON_TPM_DATA_FIFO_0_ADDRESS_DEFAULT);
Index++;
if (Index == sizeof (TPM_RSP_COMMAND_HDR))
break;
}
}
//
// Check the response data header (tag, parasize and returncode)
//
ResponseHeader = (TPM_RSP_COMMAND_HDR *)TpmBuffer;
if (SwapBytes16 (ReadUnaligned16 (&ResponseHeader->tag)) != TPM_TAG_RSP_COMMAND) {
Status = EFI_DEVICE_ERROR;
goto Done;
}
ResponseSize = SwapBytes32 (ReadUnaligned32 (&ResponseHeader->paramSize));
if (ResponseSize == sizeof (TPM_RSP_COMMAND_HDR)) {
Status = EFI_SUCCESS;
goto Done;
}
if (ResponseSize < sizeof (TPM_RSP_COMMAND_HDR)) {
Status = EFI_DEVICE_ERROR;
goto Done;
}
if (*RespSize < ResponseSize) {
Status = EFI_BUFFER_TOO_SMALL;
goto Done;
}
*RespSize = ResponseSize;
//
// Continue reading the remaining data
//
while (Index < ResponseSize) {
for (; BurstCount > 0 ; BurstCount--) {
*(TpmBuffer + Index) = TpmReadByte (INFINEON_TPM_DATA_FIFO_0_ADDRESS_DEFAULT);
Index++;
if (Index == ResponseSize) {
Status = EFI_SUCCESS;
goto Done;
}
}
Status = TisPcReadBurstCount (&BurstCount);
if (EFI_ERROR (Status) && (Index < ResponseSize)) {
Status = EFI_DEVICE_ERROR;
goto Done;
}
}
Done:
//
// Ensure the TPM state change from "Execution" or "Completion" to "Idle/Ready"
//
TpmWriteByte (INFINEON_TPM_STS_0_ADDRESS_DEFAULT, TIS_PC_STS_READY);
return Status;
}
/**
Send a command to TPM for execution and return response data.
@param[in] PeiServices Describes the list of possible PEI Services.
@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_TIMEOUT The register can't run into the expected status in time.
@retval EFI_BUFFER_TOO_SMALL Response data buffer is too small.
@retval EFI_DEVICE_ERROR Unexpected device behavior.
**/
EFI_STATUS
TisTpmCommand (
IN EFI_PEI_SERVICES **PeiServices,
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;
Status = TisPcPrepareCommand (TisReg);
if (EFI_ERROR (Status)){
DEBUG ((DEBUG_ERROR, "Tpm is not ready for command!\n"));
return Status;
}
//
// Send the command data to Tpm
//
Index = 0;
while (Index < SizeIn) {
Status = TisPcReadBurstCount (TisReg, &BurstCount);
if (EFI_ERROR (Status)) {
Status = EFI_TIMEOUT;
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 = TisPcWaitRegisterBits (
&TisReg->Status,
(UINT8) TIS_PC_VALID,
TIS_PC_STS_EXPECT,
TIS_TIMEOUT_C
);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "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 = TisPcWaitRegisterBits (
&TisReg->Status,
(UINT8) (TIS_PC_VALID | TIS_PC_STS_DATA),
0,
TIS_TIMEOUT_B
);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "Wait for Tpm response data time out!!\n"));
Status = EFI_TIMEOUT;
goto Exit;
}
//
// Get response data header
//
Index = 0;
BurstCount = 0;
while (Index < sizeof (TPM_RSP_COMMAND_HDR)) {
Status = TisPcReadBurstCount (TisReg, &BurstCount);
if (EFI_ERROR (Status)) {
Status = EFI_TIMEOUT;
goto Exit;
}
for (; BurstCount > 0; BurstCount--) {
*(BufferOut + Index) = MmioRead8 ((UINTN)&TisReg->DataFifo);
Index++;
if (Index == sizeof (TPM_RSP_COMMAND_HDR)) break;
}
}
//
// Check the reponse data header (tag,parasize and returncode )
//
CopyMem (&Data16, BufferOut, sizeof (UINT16));
if (SwapBytes16 (Data16) != TPM_TAG_RSP_COMMAND ) {
Status = EFI_DEVICE_ERROR;
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 = TisPcReadBurstCount (TisReg, &BurstCount);
if (EFI_ERROR (Status)) {
Status = EFI_TIMEOUT;
goto Exit;
}
}
Exit:
MmioWrite8((UINTN)&TisReg->Status, TIS_PC_STS_READY);
return Status;
}
