mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 02:51:00 +00:00
d677bfe2f7
There are no changes in this commit but a new organization of the code as follow. * cmd/ directory: > move existing code from cmd/tpm.c in cmd/tpm-common.c > move specific code in cmd/tpm-v1.c > create a specific header file with generic definitions for commands only called cmd/tpm-user-utils.h * lib/ directory: > move existing code from lib/tpm.c in lib/tpm-common.c > move specific code in lib/tpm-v1.c > create a specific header file with generic definitions for the library itself called lib/tpm-utils.h * include/ directory: > move existing code from include/tpm.h in include/tpm-common.h > move specific code in include/tpm-v1.h Code designated as 'common' is compiled if TPM are used. Code designated as 'specific' is compiled only if the right specification has been selected. All files include tpm-common.h. Files in cmd/ include tpm-user-utils.h. Files in lib/ include tpm-utils.h. Depending on the specification, files may include either (not both) tpm-v1.h or tpm-v2.h. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Reviewed-by: Tom Rini <trini@konsulko.com> [trini: Fix a few more cases of tpm.h -> tpm-v1.h, some Kconfig logic] Signed-off-by: Tom Rini <trini@konsulko.com>
544 lines
13 KiB
C
544 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* STMicroelectronics TPM ST33ZP24 I2C UBOOT driver
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*
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* Copyright (C) 2016, STMicroelectronics - All Rights Reserved
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* Author(s): Christophe Ricard <christophe-h.ricard@st.com> for STMicroelectronics.
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*
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* Description: Device driver for ST33ZP24 I2C 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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#include <common.h>
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#include <dm.h>
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#include <fdtdec.h>
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#include <i2c.h>
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#include <tpm-v1.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 "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_DUMMY_BYTE 0xAA
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#define TPM_ST33ZP24_I2C_SLAVE_ADDR 0x13
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#define TPM_WRITE_DIRECTION 0x80
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/*
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* st33zp24_i2c_write8_reg
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* Send byte to the TIS register according to the ST33ZP24 I2C protocol.
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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: Number of byte written successfully else an error code.
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*/
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static int st33zp24_i2c_write8_reg(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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struct tpm_chip_priv *chip_priv = dev_get_uclass_priv(dev);
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chip_priv->buf[0] = tpm_register;
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memcpy(chip_priv->buf + 1, tpm_data, tpm_size);
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return dm_i2c_write(dev, 0, chip_priv->buf, tpm_size + 1);
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}
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/*
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* st33zp24_i2c_read8_reg
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* Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
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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 else an error code.
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*/
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static int st33zp24_i2c_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 status;
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u8 data;
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data = TPM_DUMMY_BYTE;
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status = st33zp24_i2c_write8_reg(dev, tpm_register, &data, 1);
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if (status < 0)
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return status;
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return dm_i2c_read(dev, 0, tpm_data, tpm_size);
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}
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/*
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* st33zp24_i2c_write
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* Send byte to the TIS register according to the ST33ZP24 I2C 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 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: number of byte written successfully: should be one if success.
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*/
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static int st33zp24_i2c_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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return st33zp24_i2c_write8_reg(dev, tpm_register | TPM_WRITE_DIRECTION,
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tpm_data, tpm_size);
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}
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/*
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* st33zp24_i2c_read
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* Recv byte from the TIS register according to the ST33ZP24 I2C 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_i2c_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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return st33zp24_i2c_read8_reg(dev, tpm_register, tpm_data, tpm_size);
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}
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/*
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* st33zp24_i2c_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_i2c_release_locality(struct udevice *dev)
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{
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u8 data = TPM_ACCESS_ACTIVE_LOCALITY;
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st33zp24_i2c_write(dev, TPM_ACCESS, &data, 1);
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}
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/*
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* st33zp24_i2c_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_i2c_check_locality(struct udevice *dev)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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u8 data;
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u8 status;
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status = st33zp24_i2c_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_i2c_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_i2c_request_locality(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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long ret;
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u8 data;
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if (st33zp24_i2c_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_i2c_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_i2c_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_i2c_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_i2c_status(struct udevice *dev)
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{
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u8 data;
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st33zp24_i2c_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_i2c_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_i2c_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_i2c_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_i2c_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_i2c_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_i2c_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_i2c_write(dev, TPM_STS, &data, 1);
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}
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/*
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* st33zp24_i2c_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_i2c_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_i2c_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_i2c_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_i2c_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_i2c_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_i2c_wait_for_stat(dev, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
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chip->timeout_c, &status) == 0) {
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burstcnt = st33zp24_i2c_get_burstcount(dev);
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if (burstcnt < 0)
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return burstcnt;
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len = min_t(int, burstcnt, count - size);
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ret = st33zp24_i2c_read(dev, TPM_DATA_FIFO, buf + size, len);
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if (ret < 0)
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return ret;
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size += len;
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}
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return size;
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}
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/*
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* st33zp24_i2c_recv received TPM response through TPM phy.
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* @param: chip, tpm_chip description.
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* @param: buf, the buffer to store data.
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* @param: count, the number of bytes that can received (sizeof buf).
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* @return: Returns zero in case of success else -EIO.
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*/
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static int st33zp24_i2c_recv(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;
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unsigned int expected;
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if (!chip)
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return -ENODEV;
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if (count < TPM_HEADER_SIZE) {
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size = -EIO;
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goto out;
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}
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size = st33zp24_i2c_recv_data(dev, buf, TPM_HEADER_SIZE);
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if (size < TPM_HEADER_SIZE) {
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debug("TPM error, unable to read header\n");
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goto out;
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}
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expected = get_unaligned_be32(buf + 2);
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if (expected > count || expected < TPM_HEADER_SIZE) {
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size = -EIO;
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goto out;
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}
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size += st33zp24_i2c_recv_data(dev, &buf[TPM_HEADER_SIZE],
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expected - TPM_HEADER_SIZE);
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if (size < expected) {
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debug("TPM error, unable to read remaining bytes of result\n");
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size = -EIO;
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goto out;
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}
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out:
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st33zp24_i2c_cancel(dev);
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st33zp24_i2c_release_locality(dev);
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return size;
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}
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/*
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* st33zp24_i2c_send send TPM commands through TPM phy.
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* @param: chip, tpm_chip description.
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* @param: buf, the buffer to send.
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* @param: len, the number of bytes to send.
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* @return: Returns zero in case of success else the negative error code.
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*/
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static int st33zp24_i2c_send(struct udevice *dev, const u8 *buf, size_t len)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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u32 i, size;
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int burstcnt, ret, status;
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u8 data, tpm_stat;
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if (!chip)
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return -ENODEV;
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if (len < TPM_HEADER_SIZE)
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return -EIO;
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ret = st33zp24_i2c_request_locality(dev);
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if (ret < 0)
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return ret;
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tpm_stat = st33zp24_i2c_status(dev);
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if ((tpm_stat & TPM_STS_COMMAND_READY) == 0) {
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st33zp24_i2c_cancel(dev);
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if (st33zp24_i2c_wait_for_stat(dev, TPM_STS_COMMAND_READY,
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chip->timeout_b, &status) < 0) {
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ret = -ETIME;
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goto out_err;
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}
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}
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for (i = 0; i < len - 1;) {
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burstcnt = st33zp24_i2c_get_burstcount(dev);
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if (burstcnt < 0)
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return burstcnt;
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size = min_t(int, len - i - 1, burstcnt);
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ret = st33zp24_i2c_write(dev, TPM_DATA_FIFO, buf + i, size);
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if (ret < 0)
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goto out_err;
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i += size;
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}
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tpm_stat = st33zp24_i2c_status(dev);
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if ((tpm_stat & TPM_STS_DATA_EXPECT) == 0) {
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ret = -EIO;
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goto out_err;
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}
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ret = st33zp24_i2c_write(dev, TPM_DATA_FIFO, buf + len - 1, 1);
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if (ret < 0)
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goto out_err;
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tpm_stat = st33zp24_i2c_status(dev);
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if ((tpm_stat & TPM_STS_DATA_EXPECT) != 0) {
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ret = -EIO;
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goto out_err;
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}
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data = TPM_STS_GO;
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ret = st33zp24_i2c_write(dev, TPM_STS, &data, 1);
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if (ret < 0)
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goto out_err;
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return len;
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out_err:
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st33zp24_i2c_cancel(dev);
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st33zp24_i2c_release_locality(dev);
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return ret;
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}
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static int st33zp24_i2c_cleanup(struct udevice *dev)
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{
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st33zp24_i2c_cancel(dev);
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/*
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* The TPM needs some time to clean up here,
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* so we sleep rather than keeping the bus busy
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*/
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mdelay(2);
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st33zp24_i2c_release_locality(dev);
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return 0;
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}
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static int st33zp24_i2c_init(struct udevice *dev)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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chip->is_open = 1;
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/* Default timeouts - these could move to the device tree */
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chip->timeout_a = TIS_SHORT_TIMEOUT_MS;
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chip->timeout_b = TIS_LONG_TIMEOUT_MS;
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chip->timeout_c = TIS_SHORT_TIMEOUT_MS;
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chip->timeout_d = TIS_SHORT_TIMEOUT_MS;
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chip->locality = LOCALITY0;
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/*
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* A timeout query to TPM can be placed here.
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* Standard timeout values are used so far
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*/
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return 0;
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}
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static int st33zp24_i2c_open(struct udevice *dev)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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int rc;
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debug("%s: start\n", __func__);
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if (chip->is_open)
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return -EBUSY;
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rc = st33zp24_i2c_init(dev);
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if (rc < 0)
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chip->is_open = 0;
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return rc;
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}
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static int st33zp24_i2c_close(struct udevice *dev)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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|
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if (chip->is_open) {
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st33zp24_i2c_release_locality(dev);
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chip->is_open = 0;
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chip->vend_dev = 0;
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}
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|
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return 0;
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}
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|
|
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static int st33zp24_i2c_get_desc(struct udevice *dev, char *buf, int size)
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|
{
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struct tpm_chip *chip = dev_get_priv(dev);
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|
|
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if (size < 50)
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return -ENOSPC;
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|
|
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return snprintf(buf, size, "1.2 TPM (%s, chip type %s device-id 0x%x)",
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chip->is_open ? "open" : "closed",
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|
dev->name,
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|
chip->vend_dev >> 16);
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}
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|
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static const struct tpm_ops st33zp24_i2c_tpm_ops = {
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.open = st33zp24_i2c_open,
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.close = st33zp24_i2c_close,
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.recv = st33zp24_i2c_recv,
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.send = st33zp24_i2c_send,
|
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.cleanup = st33zp24_i2c_cleanup,
|
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.get_desc = st33zp24_i2c_get_desc,
|
|
};
|
|
|
|
static int st33zp24_i2c_probe(struct udevice *dev)
|
|
{
|
|
struct tpm_chip *chip = dev_get_priv(dev);
|
|
|
|
/* Default timeouts */
|
|
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;
|
|
|
|
i2c_set_chip_offset_len(dev, 0);
|
|
|
|
debug("ST33ZP24 I2C TPM from STMicroelectronics found\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int st33zp24_i2c_remove(struct udevice *dev)
|
|
{
|
|
st33zp24_i2c_release_locality(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct udevice_id st33zp24_i2c_ids[] = {
|
|
{ .compatible = "st,st33zp24-i2c" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(st33zp24_i2c) = {
|
|
.name = "st33zp24-i2c",
|
|
.id = UCLASS_TPM,
|
|
.of_match = of_match_ptr(st33zp24_i2c_ids),
|
|
.probe = st33zp24_i2c_probe,
|
|
.remove = st33zp24_i2c_remove,
|
|
.ops = &st33zp24_i2c_tpm_ops,
|
|
.priv_auto_alloc_size = sizeof(struct tpm_chip),
|
|
};
|