/**
Receive a response to a command from Atmel I2c TPM breaking response into
multiple I2C transfers if required.
@param[out] Buffer Pointer to TPM response data.
@param[in] Length Maximum number of bytes to receive.
@retval EFI_SUCCESS TPM response received.
@retval EFI_NOT_FOUND TPM chip doesn't exit.
@retval EFI_TIMEOUT Can't get the TPM control in time.
**/
EFI_STATUS
ReadTpmBufferMultiple (
OUT UINT8 *Buffer,
IN UINTN Length
)
{
EFI_STATUS Status;
EFI_I2C_DEVICE_ADDRESS I2CDeviceAddr;
UINTN WriteLength;
UINTN Index;
UINTN PartialLength;
Status = EFI_SUCCESS;
I2CDeviceAddr.I2CDeviceAddress = ATMEL_I2C_TPM_SLAVE_ADDRESS;
WriteLength = 0;
DEBUG ((EFI_D_VERBOSE, "ReadTpmBufferMultiple: Addr=%02x Length=%02x\n", I2CDeviceAddr.I2CDeviceAddress, Length));
for (PartialLength = 0; Length > 0; Length -= PartialLength, Buffer += PartialLength) {
//
// Read data from TPM.
//
PartialLength = MIN (Length, ATMEL_I2C_TPM_MAX_TRANSFER_SIZE);
Status = I2cReadMultipleByte (
I2CDeviceAddr,
EfiI2CSevenBitAddrMode,
&WriteLength,
&PartialLength,
Buffer
);
if (!EFI_ERROR (Status)) {
DEBUG ((EFI_D_VERBOSE, " "));
for (Index = 0; Index < PartialLength; Index++) {
DEBUG ((EFI_D_VERBOSE, "%02x ", Buffer[Index]));
}
DEBUG ((EFI_D_VERBOSE, "\n"));
}
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_VERBOSE, " Status = %r\n", Status));
return Status;
}
}
DEBUG ((EFI_D_VERBOSE, " Status = %r\n", Status));
return Status;
}
/**
Initialize state of I2C GPIO expanders.
**/
EFI_STATUS
EarlyPlatformConfigGpioExpanders (
VOID
)
{
EFI_STATUS Status;
EFI_I2C_DEVICE_ADDRESS I2CSlaveAddress;
UINTN Length;
UINTN ReadLength;
UINT8 Buffer[2];
//
// Configure GPIO expanders for Galileo
// Set all GPIO expander pins connected to the Reset Button as inputs
// Route I2C pins to Arduino header
//
//
// Detect the I2C Slave Address of the GPIO Expander
//
if (PlatformLegacyGpioGetLevel(R_QNC_GPIO_RGLVL_RESUME_WELL, GALILEO_DETERMINE_IOEXP_SLA_RESUMEWELL_GPIO)) {
I2CSlaveAddress.I2CDeviceAddress = GALILEO_IOEXP_J2HI_7BIT_SLAVE_ADDR;
} else {
I2CSlaveAddress.I2CDeviceAddress = GALILEO_IOEXP_J2LO_7BIT_SLAVE_ADDR;
}
DEBUG((EFI_D_INFO, "Galileo GPIO Expender Slave Address = %02x\n", I2CSlaveAddress.I2CDeviceAddress));
//
// Set I2C_MUX (GPORT1_BIT5) low to route I2C to Arduino Shield connector
//
//
// Select GPIO Expander GPORT1
//
Length = 2;
Buffer[0] = 0x18; //sub-address
Buffer[1] = 0x01; //data
Status = I2cWriteMultipleByte(
I2CSlaveAddress,
EfiI2CSevenBitAddrMode,
&Length,
&Buffer
);
if (EFI_ERROR(Status)) {
DEBUG((EFI_D_WARN, "Fail to select GPIO Expander\n"));
return EFI_SUCCESS;
}
//
// Read "Pin Direction" of GPIO Expander GPORT1
//
Length = 1;
ReadLength = 1;
Buffer[1] = 0x1C;
Status = I2cReadMultipleByte (
I2CSlaveAddress,
EfiI2CSevenBitAddrMode,
&Length,
&ReadLength,
&Buffer[1]
);
ASSERT_EFI_ERROR (Status);
//
// Configure GPIO Expander GPORT1_BIT5 as an output
//
Length = 2;
Buffer[0] = 0x1C; //sub-address
Buffer[1] = (UINT8)(Buffer[1] & (~BIT5)); //data
Status = I2cWriteMultipleByte (
I2CSlaveAddress,
EfiI2CSevenBitAddrMode,
&Length,
&Buffer
);
ASSERT_EFI_ERROR (Status);
//
// Set GPIO Expander GPORT1_BIT5 low
//
Length = 2;
Buffer[0] = 0x09; //sub-address
Buffer[1] = (UINT8)(~BIT5); //data
Status = I2cWriteMultipleByte (
I2CSlaveAddress,
EfiI2CSevenBitAddrMode,
&Length,
&Buffer
);
ASSERT_EFI_ERROR (Status);
//
// Configure RESET_N_SHLD (GPORT5_BIT0) and SW_RESET_N_SHLD (GPORT5_BIT1) as inputs
//
//
// Select GPIO Expander GPORT5
//
Length = 2;
Buffer[0] = 0x18;
Buffer[1] = 0x05;
Status = I2cWriteMultipleByte (
I2CSlaveAddress,
EfiI2CSevenBitAddrMode,
&Length,
&Buffer
);
ASSERT_EFI_ERROR (Status);
//
// Read "Pin Direction" of GPIO Expander GPORT5
//
Length = 1;
ReadLength = 1;
Buffer[1] = 0x1C;
Status = I2cReadMultipleByte (
I2CSlaveAddress,
EfiI2CSevenBitAddrMode,
&Length,
&ReadLength,
&Buffer[1]
);
ASSERT_EFI_ERROR (Status);
//
// Configure GPIO Expander GPORT5_BIT0 and GPORT5_BIT1 as inputs
//
Length = 2;
Buffer[0] = 0x1C;
Buffer[1] = Buffer[1] | BIT0 | BIT1;
Status = I2cWriteMultipleByte (
I2CSlaveAddress,
EfiI2CSevenBitAddrMode,
&Length,
&Buffer
);
ASSERT_EFI_ERROR (Status);
return EFI_SUCCESS;
}
