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https://github.com/brain-hackers/u-boot-brain
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673 lines
16 KiB
C
673 lines
16 KiB
C
![]() |
/*
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* STMicroelectronics TPM ST33ZP24 SPI UBOOT driver
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*
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* Copyright (C) 2016 STMicroelectronics
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*
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* Description: Device driver for ST33ZP24 SPI TPM TCG.
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*
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* This device driver implements the TPM interface as defined in
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* the TCG TPM Interface Spec version 1.21, revision 1.0 and the
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* STMicroelectronics Protocol Stack Specification version 1.2.0.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <fdtdec.h>
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#include <spi.h>
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#include <tpm.h>
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#include <errno.h>
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#include <linux/types.h>
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#include <asm/unaligned.h>
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#include <linux/compat.h>
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#include "tpm_tis.h"
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#include "tpm_internal.h"
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#define TPM_ACCESS 0x0
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#define TPM_STS 0x18
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#define TPM_DATA_FIFO 0x24
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#define LOCALITY0 0
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#define TPM_DATA_FIFO 0x24
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#define TPM_INTF_CAPABILITY 0x14
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#define TPM_DUMMY_BYTE 0x00
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#define TPM_WRITE_DIRECTION 0x80
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#define MAX_SPI_LATENCY 15
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#define LOCALITY0 0
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#define ST33ZP24_OK 0x5A
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#define ST33ZP24_UNDEFINED_ERR 0x80
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#define ST33ZP24_BADLOCALITY 0x81
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#define ST33ZP24_TISREGISTER_UKNOWN 0x82
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#define ST33ZP24_LOCALITY_NOT_ACTIVATED 0x83
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#define ST33ZP24_HASH_END_BEFORE_HASH_START 0x84
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#define ST33ZP24_BAD_COMMAND_ORDER 0x85
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#define ST33ZP24_INCORECT_RECEIVED_LENGTH 0x86
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#define ST33ZP24_TPM_FIFO_OVERFLOW 0x89
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#define ST33ZP24_UNEXPECTED_READ_FIFO 0x8A
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#define ST33ZP24_UNEXPECTED_WRITE_FIFO 0x8B
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#define ST33ZP24_CMDRDY_SET_WHEN_PROCESSING_HASH_END 0x90
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#define ST33ZP24_DUMMY_BYTES 0x00
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/*
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* TPM command can be up to 2048 byte, A TPM response can be up to
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* 1024 byte.
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* Between command and response, there are latency byte (up to 15
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* usually on st33zp24 2 are enough).
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*
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* Overall when sending a command and expecting an answer we need if
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* worst case:
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* 2048 (for the TPM command) + 1024 (for the TPM answer). We need
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* some latency byte before the answer is available (max 15).
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* We have 2048 + 1024 + 15.
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*/
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#define ST33ZP24_SPI_BUFFER_SIZE (TPM_BUFSIZE + (TPM_BUFSIZE / 2) +\
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MAX_SPI_LATENCY)
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struct st33zp24_spi_phy {
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int latency;
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u8 tx_buf[ST33ZP24_SPI_BUFFER_SIZE];
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u8 rx_buf[ST33ZP24_SPI_BUFFER_SIZE];
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};
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static int st33zp24_spi_status_to_errno(u8 code)
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{
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switch (code) {
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case ST33ZP24_OK:
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return 0;
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case ST33ZP24_UNDEFINED_ERR:
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case ST33ZP24_BADLOCALITY:
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case ST33ZP24_TISREGISTER_UKNOWN:
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case ST33ZP24_LOCALITY_NOT_ACTIVATED:
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case ST33ZP24_HASH_END_BEFORE_HASH_START:
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case ST33ZP24_BAD_COMMAND_ORDER:
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case ST33ZP24_UNEXPECTED_READ_FIFO:
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case ST33ZP24_UNEXPECTED_WRITE_FIFO:
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case ST33ZP24_CMDRDY_SET_WHEN_PROCESSING_HASH_END:
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return -EPROTO;
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case ST33ZP24_INCORECT_RECEIVED_LENGTH:
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case ST33ZP24_TPM_FIFO_OVERFLOW:
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return -EMSGSIZE;
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case ST33ZP24_DUMMY_BYTES:
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return -ENOSYS;
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}
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return code;
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}
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/*
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* st33zp24_spi_send
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* Send byte to TPM register according to the ST33ZP24 SPI protocol.
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* @param: tpm, the chip description
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* @param: tpm_register, the tpm tis register where the data should be written
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* @param: tpm_data, the tpm_data to write inside the tpm_register
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* @param: tpm_size, The length of the data
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* @return: should be zero if success else a negative error code.
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*/
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static int st33zp24_spi_write(struct udevice *dev, u8 tpm_register,
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const u8 *tpm_data, size_t tpm_size)
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{
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int total_length = 0, ret;
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struct spi_slave *slave = dev_get_parent_priv(dev);
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struct st33zp24_spi_phy *phy = dev_get_platdata(dev);
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u8 *tx_buf = (u8 *)phy->tx_buf;
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u8 *rx_buf = phy->rx_buf;
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tx_buf[total_length++] = TPM_WRITE_DIRECTION | LOCALITY0;
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tx_buf[total_length++] = tpm_register;
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if (tpm_size > 0 && tpm_register == TPM_DATA_FIFO) {
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tx_buf[total_length++] = tpm_size >> 8;
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tx_buf[total_length++] = tpm_size;
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}
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memcpy(tx_buf + total_length, tpm_data, tpm_size);
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total_length += tpm_size;
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memset(tx_buf + total_length, TPM_DUMMY_BYTE, phy->latency);
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total_length += phy->latency;
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ret = spi_claim_bus(slave);
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if (ret < 0)
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return ret;
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ret = spi_xfer(slave, total_length * 8, tx_buf, rx_buf,
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SPI_XFER_BEGIN | SPI_XFER_END);
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if (ret < 0)
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return ret;
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spi_release_bus(slave);
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if (ret == 0)
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ret = rx_buf[total_length - 1];
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return st33zp24_spi_status_to_errno(ret);
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}
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/*
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* spi_st33zp24_spi_read8_reg
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* Recv byte from the TIS register according to the ST33ZP24 SPI protocol.
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* @param: tpm, the chip description
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* @param: tpm_loc, the locality to read register from
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* @param: tpm_register, the tpm tis register where the data should be read
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* @param: tpm_data, the TPM response
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* @param: tpm_size, tpm TPM response size to read.
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* @return: should be zero if success else a negative error code.
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*/
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static u8 st33zp24_spi_read8_reg(struct udevice *dev, u8 tpm_register,
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u8 *tpm_data, size_t tpm_size)
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{
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int total_length = 0, ret;
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struct spi_slave *slave = dev_get_parent_priv(dev);
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struct st33zp24_spi_phy *phy = dev_get_platdata(dev);
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u8 *tx_buf = (u8 *)phy->tx_buf;
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u8 *rx_buf = phy->rx_buf;
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/* Pre-Header */
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tx_buf[total_length++] = LOCALITY0;
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tx_buf[total_length++] = tpm_register;
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memset(&tx_buf[total_length], TPM_DUMMY_BYTE,
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phy->latency + tpm_size);
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total_length += phy->latency + tpm_size;
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ret = spi_claim_bus(slave);
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if (ret < 0)
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return 0;
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ret = spi_xfer(slave, total_length * 8, tx_buf, rx_buf,
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SPI_XFER_BEGIN | SPI_XFER_END);
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if (ret < 0)
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return 0;
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spi_release_bus(slave);
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if (tpm_size > 0 && ret == 0) {
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ret = rx_buf[total_length - tpm_size - 1];
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memcpy(tpm_data, rx_buf + total_length - tpm_size, tpm_size);
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}
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return ret;
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}
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/*
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* st33zp24_spi_recv
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* Recv byte from the TIS register according to the ST33ZP24 SPI protocol.
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* @param: phy_id, the phy description
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* @param: tpm_register, the tpm tis register where the data should be read
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* @param: tpm_data, the TPM response
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* @param: tpm_size, tpm TPM response size to read.
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* @return: number of byte read successfully: should be one if success.
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*/
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static int st33zp24_spi_read(struct udevice *dev, u8 tpm_register,
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u8 *tpm_data, size_t tpm_size)
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{
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int ret;
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ret = st33zp24_spi_read8_reg(dev, tpm_register, tpm_data, tpm_size);
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if (!st33zp24_spi_status_to_errno(ret))
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return tpm_size;
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return ret;
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}
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static int st33zp24_spi_evaluate_latency(struct udevice *dev)
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{
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int latency = 1, status = 0;
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u8 data = 0;
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struct st33zp24_spi_phy *phy = dev_get_platdata(dev);
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while (!status && latency < MAX_SPI_LATENCY) {
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phy->latency = latency;
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status = st33zp24_spi_read8_reg(dev, TPM_INTF_CAPABILITY,
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&data, 1);
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latency++;
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}
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if (status < 0)
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return status;
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if (latency == MAX_SPI_LATENCY)
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return -ENODEV;
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return latency - 1;
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}
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/*
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* st33zp24_spi_release_locality release the active locality
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* @param: chip, the tpm chip description.
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*/
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static void st33zp24_spi_release_locality(struct udevice *dev)
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{
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u8 data = TPM_ACCESS_ACTIVE_LOCALITY;
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st33zp24_spi_write(dev, TPM_ACCESS, &data, 1);
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}
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/*
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* st33zp24_spi_check_locality if the locality is active
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* @param: chip, the tpm chip description
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* @return: the active locality or -EACCES.
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*/
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static int st33zp24_spi_check_locality(struct udevice *dev)
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{
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u8 data;
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u8 status;
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struct tpm_chip *chip = dev_get_priv(dev);
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status = st33zp24_spi_read(dev, TPM_ACCESS, &data, 1);
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if (status && (data &
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(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
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(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
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return chip->locality;
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return -EACCES;
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}
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/*
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* st33zp24_spi_request_locality request the TPM locality
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* @param: chip, the chip description
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* @return: the active locality or negative value.
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*/
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static int st33zp24_spi_request_locality(struct udevice *dev)
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{
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unsigned long start, stop;
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long ret;
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u8 data;
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struct tpm_chip *chip = dev_get_priv(dev);
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if (st33zp24_spi_check_locality(dev) == chip->locality)
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return chip->locality;
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data = TPM_ACCESS_REQUEST_USE;
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ret = st33zp24_spi_write(dev, TPM_ACCESS, &data, 1);
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if (ret < 0)
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return ret;
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/* wait for locality activated */
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start = get_timer(0);
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stop = chip->timeout_a;
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do {
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if (st33zp24_spi_check_locality(dev) >= 0)
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return chip->locality;
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udelay(TPM_TIMEOUT_MS * 1000);
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} while (get_timer(start) < stop);
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return -EACCES;
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}
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/*
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* st33zp24_spi_status return the TPM_STS register
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* @param: chip, the tpm chip description
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* @return: the TPM_STS register value.
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*/
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static u8 st33zp24_spi_status(struct udevice *dev)
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{
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u8 data;
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st33zp24_spi_read(dev, TPM_STS, &data, 1);
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return data;
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}
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/*
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* st33zp24_spi_get_burstcount return the burstcount address 0x19 0x1A
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* @param: chip, the chip description
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* return: the burstcount or -TPM_DRIVER_ERR in case of error.
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*/
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static int st33zp24_spi_get_burstcount(struct udevice *dev)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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unsigned long start, stop;
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int burstcnt, status;
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u8 tpm_reg, temp;
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/* wait for burstcount */
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start = get_timer(0);
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stop = chip->timeout_d;
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do {
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tpm_reg = TPM_STS + 1;
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status = st33zp24_spi_read(dev, tpm_reg, &temp, 1);
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if (status < 0)
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return -EBUSY;
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tpm_reg = TPM_STS + 2;
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burstcnt = temp;
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status = st33zp24_spi_read(dev, tpm_reg, &temp, 1);
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if (status < 0)
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return -EBUSY;
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burstcnt |= temp << 8;
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if (burstcnt)
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return burstcnt;
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udelay(TIS_SHORT_TIMEOUT_MS * 1000);
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} while (get_timer(start) < stop);
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return -EBUSY;
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}
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/*
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* st33zp24_spi_cancel, cancel the current command execution or
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* set STS to COMMAND READY.
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* @param: chip, tpm_chip description.
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*/
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static void st33zp24_spi_cancel(struct udevice *dev)
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{
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u8 data;
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data = TPM_STS_COMMAND_READY;
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st33zp24_spi_write(dev, TPM_STS, &data, 1);
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}
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/*
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* st33zp24_spi_wait_for_stat wait for a TPM_STS value
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* @param: chip, the tpm chip description
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* @param: mask, the value mask to wait
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* @param: timeout, the timeout
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* @param: status,
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* @return: the tpm status, 0 if success, -ETIME if timeout is reached.
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*/
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static int st33zp24_spi_wait_for_stat(struct udevice *dev, u8 mask,
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unsigned long timeout, int *status)
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{
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unsigned long start, stop;
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/* Check current status */
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*status = st33zp24_spi_status(dev);
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if ((*status & mask) == mask)
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return 0;
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start = get_timer(0);
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stop = timeout;
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do {
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udelay(TPM_TIMEOUT_MS * 1000);
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*status = st33zp24_spi_status(dev);
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if ((*status & mask) == mask)
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return 0;
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} while (get_timer(start) < stop);
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return -ETIME;
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}
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/*
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* st33zp24_spi_recv_data receive data
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* @param: chip, the tpm chip description
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* @param: buf, the buffer where the data are received
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* @param: count, the number of data to receive
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* @return: the number of bytes read from TPM FIFO.
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*/
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static int st33zp24_spi_recv_data(struct udevice *dev, u8 *buf, size_t count)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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int size = 0, burstcnt, len, ret, status;
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while (size < count &&
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st33zp24_spi_wait_for_stat(dev, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
|
||
|
chip->timeout_c, &status) == 0) {
|
||
|
burstcnt = st33zp24_spi_get_burstcount(dev);
|
||
|
if (burstcnt < 0)
|
||
|
return burstcnt;
|
||
|
len = min_t(int, burstcnt, count - size);
|
||
|
ret = st33zp24_spi_read(dev, TPM_DATA_FIFO, buf + size, len);
|
||
|
if (ret < 0)
|
||
|
return ret;
|
||
|
|
||
|
size += len;
|
||
|
}
|
||
|
return size;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* st33zp24_spi_recv received TPM response through TPM phy.
|
||
|
* @param: chip, tpm_chip description.
|
||
|
* @param: buf, the buffer to store data.
|
||
|
* @param: count, the number of bytes that can received (sizeof buf).
|
||
|
* @return: Returns zero in case of success else -EIO.
|
||
|
*/
|
||
|
static int st33zp24_spi_recv(struct udevice *dev, u8 *buf, size_t count)
|
||
|
{
|
||
|
struct tpm_chip *chip = dev_get_priv(dev);
|
||
|
int size, expected;
|
||
|
|
||
|
if (!chip)
|
||
|
return -ENODEV;
|
||
|
|
||
|
if (count < TPM_HEADER_SIZE) {
|
||
|
size = -EIO;
|
||
|
goto out;
|
||
|
}
|
||
|
|
||
|
size = st33zp24_spi_recv_data(dev, buf, TPM_HEADER_SIZE);
|
||
|
if (size < TPM_HEADER_SIZE) {
|
||
|
debug("TPM error, unable to read header\n");
|
||
|
goto out;
|
||
|
}
|
||
|
|
||
|
expected = get_unaligned_be32(buf + 2);
|
||
|
if (expected > count) {
|
||
|
size = -EIO;
|
||
|
goto out;
|
||
|
}
|
||
|
|
||
|
size += st33zp24_spi_recv_data(dev, &buf[TPM_HEADER_SIZE],
|
||
|
expected - TPM_HEADER_SIZE);
|
||
|
if (size < expected) {
|
||
|
debug("TPM error, unable to read remaining bytes of result\n");
|
||
|
size = -EIO;
|
||
|
goto out;
|
||
|
}
|
||
|
|
||
|
out:
|
||
|
st33zp24_spi_cancel(dev);
|
||
|
st33zp24_spi_release_locality(dev);
|
||
|
|
||
|
return size;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* st33zp24_spi_send send TPM commands through TPM phy.
|
||
|
* @param: chip, tpm_chip description.
|
||
|
* @param: buf, the buffer to send.
|
||
|
* @param: len, the number of bytes to send.
|
||
|
* @return: Returns zero in case of success else the negative error code.
|
||
|
*/
|
||
|
static int st33zp24_spi_send(struct udevice *dev, const u8 *buf, size_t len)
|
||
|
{
|
||
|
struct tpm_chip *chip = dev_get_priv(dev);
|
||
|
u32 i, size;
|
||
|
int burstcnt, ret, status;
|
||
|
u8 data, tpm_stat;
|
||
|
|
||
|
if (!chip)
|
||
|
return -ENODEV;
|
||
|
if (len < TPM_HEADER_SIZE)
|
||
|
return -EIO;
|
||
|
|
||
|
ret = st33zp24_spi_request_locality(dev);
|
||
|
if (ret < 0)
|
||
|
return ret;
|
||
|
|
||
|
tpm_stat = st33zp24_spi_status(dev);
|
||
|
if ((tpm_stat & TPM_STS_COMMAND_READY) == 0) {
|
||
|
st33zp24_spi_cancel(dev);
|
||
|
if (st33zp24_spi_wait_for_stat(dev, TPM_STS_COMMAND_READY,
|
||
|
chip->timeout_b, &status) < 0) {
|
||
|
ret = -ETIME;
|
||
|
goto out_err;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
for (i = 0; i < len - 1;) {
|
||
|
burstcnt = st33zp24_spi_get_burstcount(dev);
|
||
|
if (burstcnt < 0)
|
||
|
return burstcnt;
|
||
|
|
||
|
size = min_t(int, len - i - 1, burstcnt);
|
||
|
ret = st33zp24_spi_write(dev, TPM_DATA_FIFO, buf + i, size);
|
||
|
if (ret < 0)
|
||
|
goto out_err;
|
||
|
|
||
|
i += size;
|
||
|
}
|
||
|
|
||
|
tpm_stat = st33zp24_spi_status(dev);
|
||
|
if ((tpm_stat & TPM_STS_DATA_EXPECT) == 0) {
|
||
|
ret = -EIO;
|
||
|
goto out_err;
|
||
|
}
|
||
|
|
||
|
ret = st33zp24_spi_write(dev, TPM_DATA_FIFO, buf + len - 1, 1);
|
||
|
if (ret < 0)
|
||
|
goto out_err;
|
||
|
|
||
|
tpm_stat = st33zp24_spi_status(dev);
|
||
|
if ((tpm_stat & TPM_STS_DATA_EXPECT) != 0) {
|
||
|
ret = -EIO;
|
||
|
goto out_err;
|
||
|
}
|
||
|
|
||
|
data = TPM_STS_GO;
|
||
|
ret = st33zp24_spi_write(dev, TPM_STS, &data, 1);
|
||
|
if (ret < 0)
|
||
|
goto out_err;
|
||
|
|
||
|
return len;
|
||
|
|
||
|
out_err:
|
||
|
st33zp24_spi_cancel(dev);
|
||
|
st33zp24_spi_release_locality(dev);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static int st33zp24_spi_cleanup(struct udevice *dev)
|
||
|
{
|
||
|
st33zp24_spi_cancel(dev);
|
||
|
/*
|
||
|
* The TPM needs some time to clean up here,
|
||
|
* so we sleep rather than keeping the bus busy
|
||
|
*/
|
||
|
mdelay(2);
|
||
|
st33zp24_spi_release_locality(dev);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int st33zp24_spi_init(struct udevice *dev)
|
||
|
{
|
||
|
struct tpm_chip *chip = dev_get_priv(dev);
|
||
|
struct st33zp24_spi_phy *phy = dev_get_platdata(dev);
|
||
|
|
||
|
chip->is_open = 1;
|
||
|
|
||
|
/* Default timeouts - these could move to the device tree */
|
||
|
chip->timeout_a = TIS_SHORT_TIMEOUT_MS;
|
||
|
chip->timeout_b = TIS_LONG_TIMEOUT_MS;
|
||
|
chip->timeout_c = TIS_SHORT_TIMEOUT_MS;
|
||
|
chip->timeout_d = TIS_SHORT_TIMEOUT_MS;
|
||
|
|
||
|
chip->locality = LOCALITY0;
|
||
|
|
||
|
phy->latency = st33zp24_spi_evaluate_latency(dev);
|
||
|
if (phy->latency <= 0)
|
||
|
return -ENODEV;
|
||
|
|
||
|
/*
|
||
|
* A timeout query to TPM can be placed here.
|
||
|
* Standard timeout values are used so far
|
||
|
*/
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int st33zp24_spi_open(struct udevice *dev)
|
||
|
{
|
||
|
struct tpm_chip *chip = dev_get_priv(dev);
|
||
|
int rc;
|
||
|
|
||
|
debug("%s: start\n", __func__);
|
||
|
if (chip->is_open)
|
||
|
return -EBUSY;
|
||
|
|
||
|
rc = st33zp24_spi_init(dev);
|
||
|
if (rc < 0)
|
||
|
chip->is_open = 0;
|
||
|
|
||
|
return rc;
|
||
|
}
|
||
|
|
||
|
static int st33zp24_spi_close(struct udevice *dev)
|
||
|
{
|
||
|
struct tpm_chip *chip = dev_get_priv(dev);
|
||
|
|
||
|
if (chip->is_open) {
|
||
|
st33zp24_spi_release_locality(dev);
|
||
|
chip->is_open = 0;
|
||
|
chip->vend_dev = 0;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int st33zp24_spi_get_desc(struct udevice *dev, char *buf, int size)
|
||
|
{
|
||
|
struct tpm_chip *chip = dev_get_priv(dev);
|
||
|
|
||
|
if (size < 50)
|
||
|
return -ENOSPC;
|
||
|
|
||
|
return snprintf(buf, size, "1.2 TPM (%s, chip type %s device-id 0x%x)",
|
||
|
chip->is_open ? "open" : "closed",
|
||
|
dev->name,
|
||
|
chip->vend_dev >> 16);
|
||
|
}
|
||
|
|
||
|
const struct tpm_ops st33zp24_spi_tpm_ops = {
|
||
|
.open = st33zp24_spi_open,
|
||
|
.close = st33zp24_spi_close,
|
||
|
.recv = st33zp24_spi_recv,
|
||
|
.send = st33zp24_spi_send,
|
||
|
.cleanup = st33zp24_spi_cleanup,
|
||
|
.get_desc = st33zp24_spi_get_desc,
|
||
|
};
|
||
|
|
||
|
static int st33zp24_spi_probe(struct udevice *dev)
|
||
|
{
|
||
|
struct tpm_chip_priv *uc_priv = dev_get_uclass_priv(dev);
|
||
|
|
||
|
uc_priv->duration_ms[TPM_SHORT] = TIS_SHORT_TIMEOUT_MS;
|
||
|
uc_priv->duration_ms[TPM_MEDIUM] = TIS_LONG_TIMEOUT_MS;
|
||
|
uc_priv->duration_ms[TPM_LONG] = TIS_LONG_TIMEOUT_MS;
|
||
|
uc_priv->retry_time_ms = TPM_TIMEOUT_MS;
|
||
|
|
||
|
debug("ST33ZP24 SPI TPM from STMicroelectronics found\n");
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int st33zp24_spi_remove(struct udevice *dev)
|
||
|
{
|
||
|
st33zp24_spi_release_locality(dev);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static const struct udevice_id st33zp24_spi_ids[] = {
|
||
|
{ .compatible = "st,st33zp24-spi" },
|
||
|
{ }
|
||
|
};
|
||
|
|
||
|
U_BOOT_DRIVER(st33zp24_spi_spi) = {
|
||
|
.name = "st33zp24-spi",
|
||
|
.id = UCLASS_TPM,
|
||
|
.of_match = of_match_ptr(st33zp24_spi_ids),
|
||
|
.probe = st33zp24_spi_probe,
|
||
|
.remove = st33zp24_spi_remove,
|
||
|
.ops = &st33zp24_spi_tpm_ops,
|
||
|
.priv_auto_alloc_size = sizeof(struct tpm_chip),
|
||
|
.platdata_auto_alloc_size = sizeof(struct st33zp24_spi_phy),
|
||
|
};
|