diff options
Diffstat (limited to 'drivers/tpm/tpm_tis_st33zp24_i2c.c')
| -rw-r--r-- | drivers/tpm/tpm_tis_st33zp24_i2c.c | 545 |
1 files changed, 0 insertions, 545 deletions
diff --git a/drivers/tpm/tpm_tis_st33zp24_i2c.c b/drivers/tpm/tpm_tis_st33zp24_i2c.c deleted file mode 100644 index 1a265b28b22..00000000000 --- a/drivers/tpm/tpm_tis_st33zp24_i2c.c +++ /dev/null @@ -1,545 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* - * STMicroelectronics TPM ST33ZP24 I2C UBOOT driver - * - * Copyright (C) 2016, STMicroelectronics - All Rights Reserved - * Author(s): Christophe Ricard <christophe-h.ricard@st.com> for STMicroelectronics. - * - * Description: Device driver for ST33ZP24 I2C TPM TCG. - * - * This device driver implements the TPM interface as defined in - * the TCG TPM Interface Spec version 1.21, revision 1.0 and the - * STMicroelectronics Protocol Stack Specification version 1.2.0. - */ - -#include <dm.h> -#include <fdtdec.h> -#include <i2c.h> -#include <log.h> -#include <tpm-v1.h> -#include <errno.h> -#include <linux/delay.h> -#include <linux/types.h> -#include <asm/unaligned.h> - -#include "tpm_tis.h" -#include "tpm_internal.h" - -#define TPM_ACCESS 0x0 -#define TPM_STS 0x18 -#define TPM_DATA_FIFO 0x24 - -#define LOCALITY0 0 - -#define TPM_DUMMY_BYTE 0xAA -#define TPM_ST33ZP24_I2C_SLAVE_ADDR 0x13 - -#define TPM_WRITE_DIRECTION 0x80 - -/* - * st33zp24_i2c_write8_reg - * Send byte to the TIS register according to the ST33ZP24 I2C protocol. - * @param: tpm_register, the tpm tis register where the data should be written - * @param: tpm_data, the tpm_data to write inside the tpm_register - * @param: tpm_size, The length of the data - * @return: Number of byte written successfully else an error code. - */ -static int st33zp24_i2c_write8_reg(struct udevice *dev, u8 tpm_register, - const u8 *tpm_data, size_t tpm_size) -{ - struct tpm_chip_priv *chip_priv = dev_get_uclass_priv(dev); - - chip_priv->buf[0] = tpm_register; - memcpy(chip_priv->buf + 1, tpm_data, tpm_size); - - return dm_i2c_write(dev, 0, chip_priv->buf, tpm_size + 1); -} - -/* -* st33zp24_i2c_read8_reg -* Recv byte from the TIS register according to the ST33ZP24 I2C protocol. -* @param: tpm_register, the tpm tis register where the data should be read -* @param: tpm_data, the TPM response -* @param: tpm_size, tpm TPM response size to read. -* @return: Number of byte read successfully else an error code. -*/ -static int st33zp24_i2c_read8_reg(struct udevice *dev, u8 tpm_register, - u8 *tpm_data, size_t tpm_size) -{ - int status; - u8 data; - - data = TPM_DUMMY_BYTE; - status = st33zp24_i2c_write8_reg(dev, tpm_register, &data, 1); - if (status < 0) - return status; - - return dm_i2c_read(dev, 0, tpm_data, tpm_size); -} - -/* - * st33zp24_i2c_write - * Send byte to the TIS register according to the ST33ZP24 I2C protocol. - * @param: phy_id, the phy description - * @param: tpm_register, the tpm tis register where the data should be written - * @param: tpm_data, the tpm_data to write inside the tpm_register - * @param: tpm_size, the length of the data - * @return: number of byte written successfully: should be one if success. - */ -static int st33zp24_i2c_write(struct udevice *dev, u8 tpm_register, - const u8 *tpm_data, size_t tpm_size) -{ - return st33zp24_i2c_write8_reg(dev, tpm_register | TPM_WRITE_DIRECTION, - tpm_data, tpm_size); -} - -/* - * st33zp24_i2c_read - * Recv byte from the TIS register according to the ST33ZP24 I2C protocol. - * @param: phy_id, the phy description - * @param: tpm_register, the tpm tis register where the data should be read - * @param: tpm_data, the TPM response - * @param: tpm_size, tpm TPM response size to read. - * @return: number of byte read successfully: should be one if success. - */ -static int st33zp24_i2c_read(struct udevice *dev, u8 tpm_register, - u8 *tpm_data, size_t tpm_size) -{ - return st33zp24_i2c_read8_reg(dev, tpm_register, tpm_data, tpm_size); -} - -/* - * st33zp24_i2c_release_locality release the active locality - * @param: chip, the tpm chip description. - */ -static void st33zp24_i2c_release_locality(struct udevice *dev) -{ - u8 data = TPM_ACCESS_ACTIVE_LOCALITY; - - st33zp24_i2c_write(dev, TPM_ACCESS, &data, 1); -} - -/* - * st33zp24_i2c_check_locality if the locality is active - * @param: chip, the tpm chip description - * @return: the active locality or -EACCES. - */ -static int st33zp24_i2c_check_locality(struct udevice *dev) -{ - struct tpm_chip *chip = dev_get_priv(dev); - u8 data; - u8 status; - - status = st33zp24_i2c_read(dev, TPM_ACCESS, &data, 1); - if (!status && (data & - (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) == - (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) - return chip->locality; - - return -EACCES; -} - -/* - * st33zp24_i2c_request_locality request the TPM locality - * @param: chip, the chip description - * @return: the active locality or negative value. - */ -static int st33zp24_i2c_request_locality(struct udevice *dev) -{ - struct tpm_chip *chip = dev_get_priv(dev); - unsigned long start, stop; - long ret; - u8 data; - - if (st33zp24_i2c_check_locality(dev) == chip->locality) - return chip->locality; - - data = TPM_ACCESS_REQUEST_USE; - ret = st33zp24_i2c_write(dev, TPM_ACCESS, &data, 1); - if (ret < 0) - return ret; - - /* wait for locality activated */ - start = get_timer(0); - stop = chip->timeout_a; - do { - if (st33zp24_i2c_check_locality(dev) >= 0) - return chip->locality; - udelay(TPM_TIMEOUT_MS * 1000); - } while (get_timer(start) < stop); - - return -EACCES; -} - -/* - * st33zp24_i2c_status return the TPM_STS register - * @param: chip, the tpm chip description - * @return: the TPM_STS register value. - */ -static u8 st33zp24_i2c_status(struct udevice *dev) -{ - u8 data; - - st33zp24_i2c_read(dev, TPM_STS, &data, 1); - - return data; -} - -/* - * st33zp24_i2c_get_burstcount return the burstcount address 0x19 0x1A - * @param: chip, the chip description - * return: the burstcount or -TPM_DRIVER_ERR in case of error. - */ -static int st33zp24_i2c_get_burstcount(struct udevice *dev) -{ - struct tpm_chip *chip = dev_get_priv(dev); - unsigned long start, stop; - int burstcnt, status; - u8 tpm_reg, temp; - - /* wait for burstcount */ - start = get_timer(0); - stop = chip->timeout_d; - do { - tpm_reg = TPM_STS + 1; - status = st33zp24_i2c_read(dev, tpm_reg, &temp, 1); - if (status < 0) - return -EBUSY; - - tpm_reg = TPM_STS + 2; - burstcnt = temp; - status = st33zp24_i2c_read(dev, tpm_reg, &temp, 1); - if (status < 0) - return -EBUSY; - - burstcnt |= temp << 8; - if (burstcnt) - return burstcnt; - udelay(TIS_SHORT_TIMEOUT_MS * 1000); - } while (get_timer(start) < stop); - - return -EBUSY; -} - -/* - * st33zp24_i2c_cancel, cancel the current command execution or - * set STS to COMMAND READY. - * @param: chip, tpm_chip description. - */ -static void st33zp24_i2c_cancel(struct udevice *dev) -{ - u8 data; - - data = TPM_STS_COMMAND_READY; - st33zp24_i2c_write(dev, TPM_STS, &data, 1); -} - -/* - * st33zp24_i2c_wait_for_stat wait for a TPM_STS value - * @param: chip, the tpm chip description - * @param: mask, the value mask to wait - * @param: timeout, the timeout - * @param: status, - * @return: the tpm status, 0 if success, -ETIME if timeout is reached. - */ -static int st33zp24_i2c_wait_for_stat(struct udevice *dev, u8 mask, - unsigned long timeout, int *status) -{ - unsigned long start, stop; - - /* Check current status */ - *status = st33zp24_i2c_status(dev); - if ((*status & mask) == mask) - return 0; - - start = get_timer(0); - stop = timeout; - do { - udelay(TPM_TIMEOUT_MS * 1000); - *status = st33zp24_i2c_status(dev); - if ((*status & mask) == mask) - return 0; - } while (get_timer(start) < stop); - - return -ETIME; -} - -/* - * st33zp24_i2c_recv_data receive data - * @param: chip, the tpm chip description - * @param: buf, the buffer where the data are received - * @param: count, the number of data to receive - * @return: the number of bytes read from TPM FIFO. - */ -static int st33zp24_i2c_recv_data(struct udevice *dev, u8 *buf, size_t count) -{ - struct tpm_chip *chip = dev_get_priv(dev); - int size = 0, burstcnt, len, ret, status; - - while (size < count && - st33zp24_i2c_wait_for_stat(dev, TPM_STS_DATA_AVAIL | TPM_STS_VALID, - chip->timeout_c, &status) == 0) { - burstcnt = st33zp24_i2c_get_burstcount(dev); - if (burstcnt < 0) - return burstcnt; - len = min_t(int, burstcnt, count - size); - ret = st33zp24_i2c_read(dev, TPM_DATA_FIFO, buf + size, len); - if (ret < 0) - return ret; - - size += len; - } - - return size; -} - -/* - * st33zp24_i2c_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_i2c_recv(struct udevice *dev, u8 *buf, size_t count) -{ - struct tpm_chip *chip = dev_get_priv(dev); - int size; - unsigned int expected; - - if (!chip) - return -ENODEV; - - if (count < TPM_HEADER_SIZE) { - size = -EIO; - goto out; - } - - size = st33zp24_i2c_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 || expected < TPM_HEADER_SIZE) { - size = -EIO; - goto out; - } - - size += st33zp24_i2c_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_i2c_cancel(dev); - st33zp24_i2c_release_locality(dev); - - return size; -} - -/* - * st33zp24_i2c_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_i2c_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_i2c_request_locality(dev); - if (ret < 0) - return ret; - - tpm_stat = st33zp24_i2c_status(dev); - if ((tpm_stat & TPM_STS_COMMAND_READY) == 0) { - st33zp24_i2c_cancel(dev); - if (st33zp24_i2c_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_i2c_get_burstcount(dev); - if (burstcnt < 0) - return burstcnt; - - size = min_t(int, len - i - 1, burstcnt); - ret = st33zp24_i2c_write(dev, TPM_DATA_FIFO, buf + i, size); - if (ret < 0) - goto out_err; - - i += size; - } - - tpm_stat = st33zp24_i2c_status(dev); - if ((tpm_stat & TPM_STS_DATA_EXPECT) == 0) { - ret = -EIO; - goto out_err; - } - - ret = st33zp24_i2c_write(dev, TPM_DATA_FIFO, buf + len - 1, 1); - if (ret < 0) - goto out_err; - - tpm_stat = st33zp24_i2c_status(dev); - if ((tpm_stat & TPM_STS_DATA_EXPECT) != 0) { - ret = -EIO; - goto out_err; - } - - data = TPM_STS_GO; - ret = st33zp24_i2c_write(dev, TPM_STS, &data, 1); - if (ret < 0) - goto out_err; - - return len; - -out_err: - st33zp24_i2c_cancel(dev); - st33zp24_i2c_release_locality(dev); - - return ret; -} - -static int st33zp24_i2c_cleanup(struct udevice *dev) -{ - st33zp24_i2c_cancel(dev); - /* - * The TPM needs some time to clean up here, - * so we sleep rather than keeping the bus busy - */ - mdelay(2); - st33zp24_i2c_release_locality(dev); - - return 0; -} - -static int st33zp24_i2c_init(struct udevice *dev) -{ - struct tpm_chip *chip = dev_get_priv(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; - - /* - * A timeout query to TPM can be placed here. - * Standard timeout values are used so far - */ - - return 0; -} - -static int st33zp24_i2c_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_i2c_init(dev); - if (rc < 0) - chip->is_open = 0; - - return rc; -} - -static int st33zp24_i2c_close(struct udevice *dev) -{ - struct tpm_chip *chip = dev_get_priv(dev); - - if (chip->is_open) { - st33zp24_i2c_release_locality(dev); - chip->is_open = 0; - chip->vend_dev = 0; - } - - return 0; -} - -static int st33zp24_i2c_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); -} - -static const struct tpm_ops st33zp24_i2c_tpm_ops = { - .open = st33zp24_i2c_open, - .close = st33zp24_i2c_close, - .recv = st33zp24_i2c_recv, - .send = st33zp24_i2c_send, - .cleanup = st33zp24_i2c_cleanup, - .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 = sizeof(struct tpm_chip), -}; |