Add TPM st33zp24 tpm with i2c and spi phy. This is a port from Linux. This driver relies on tpm uclass.
Signed-off-by: Christophe Ricard christophe-h.ricard@st.com ---
README | 11 + drivers/tpm/Makefile | 1 + drivers/tpm/st33zp24/Makefile | 7 + drivers/tpm/st33zp24/i2c.c | 226 ++++++++++++++++ drivers/tpm/st33zp24/spi.c | 286 ++++++++++++++++++++ drivers/tpm/st33zp24/st33zp24.c | 454 ++++++++++++++++++++++++++++++++ drivers/tpm/st33zp24/st33zp24.h | 29 ++ include/dm/platform_data/st33zp24_i2c.h | 28 ++ include/dm/platform_data/st33zp24_spi.h | 30 +++ include/fdtdec.h | 5 +- lib/fdtdec.c | 2 + 11 files changed, 1078 insertions(+), 1 deletion(-) create mode 100644 drivers/tpm/st33zp24/Makefile create mode 100644 drivers/tpm/st33zp24/i2c.c create mode 100644 drivers/tpm/st33zp24/spi.c create mode 100644 drivers/tpm/st33zp24/st33zp24.c create mode 100644 drivers/tpm/st33zp24/st33zp24.h create mode 100644 include/dm/platform_data/st33zp24_i2c.h create mode 100644 include/dm/platform_data/st33zp24_spi.h
diff --git a/README b/README index 506ff6c..d3f9590 100644 --- a/README +++ b/README @@ -1499,6 +1499,17 @@ The following options need to be configured: CONFIG_TPM_TIS_I2C_BURST_LIMITATION Define the burst count bytes upper limit
+ CONFIG_TPM_ST33ZP24 + Support for STMicroelectronics TPM devices. Requires DM_TPM support. + + CONFIG_TPM_ST33ZP24_I2C + Support for STMicroelectronics ST33ZP24 I2C devices. + Requires TPM_ST33ZP24 and I2C. + + CONFIG_TPM_ST33ZP24_SPI + Support for STMicroelectronics ST33ZP24 SPI devices. + Requires TPM_ST33ZP24 and SPI. + CONFIG_TPM_ATMEL_TWI Support for Atmel TWI TPM device. Requires I2C support.
diff --git a/drivers/tpm/Makefile b/drivers/tpm/Makefile index bd2cd6d..48bc5f3 100644 --- a/drivers/tpm/Makefile +++ b/drivers/tpm/Makefile @@ -9,3 +9,4 @@ obj-$(CONFIG_DM_TPM) += tpm.o obj-$(CONFIG_TPM_INFINEON_I2C) += tpm_i2c_infineon.o obj-$(CONFIG_TPM_TIS_LPC) += tpm_tis_lpc.o obj-$(CONFIG_TPM_TIS_SANDBOX) += tpm_tis_sandbox.o +obj-$(CONFIG_TPM_ST33ZP24) += st33zp24/ diff --git a/drivers/tpm/st33zp24/Makefile b/drivers/tpm/st33zp24/Makefile new file mode 100644 index 0000000..ed28e8c --- /dev/null +++ b/drivers/tpm/st33zp24/Makefile @@ -0,0 +1,7 @@ +# +# Makefile for ST33ZP24 TPM 1.2 driver +# + +obj-$(CONFIG_TPM_ST33ZP24) += st33zp24.o +obj-$(CONFIG_TPM_ST33ZP24_I2C) += i2c.o +obj-$(CONFIG_TPM_ST33ZP24_SPI) += spi.o diff --git a/drivers/tpm/st33zp24/i2c.c b/drivers/tpm/st33zp24/i2c.c new file mode 100644 index 0000000..204021a --- /dev/null +++ b/drivers/tpm/st33zp24/i2c.c @@ -0,0 +1,226 @@ +/* + * STMicroelectronics TPM ST33ZP24 I2C phy for UBOOT + * Copyright (C) 2015 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 I2C Protocol Stack Specification version 1.2.0. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <i2c.h> +#include <dm.h> +#include <linux/types.h> +#include <malloc.h> +#include <tpm.h> +#include <errno.h> +#include <asm/unaligned.h> +#include <dm/platform_data/st33zp24_i2c.h> + +#include "../tpm_private.h" +#include "st33zp24.h" + +DECLARE_GLOBAL_DATA_PTR; + +#define TPM_DUMMY_BYTE 0xAA +#define TPM_ST33ZP24_I2C_SLAVE_ADDR 0x13 + +struct st33zp24_i2c_phy { + uint8_t slave_addr; + int i2c_bus; + int old_bus; + u8 buf[TPM_BUFSIZE + 1]; +} __packed; + +/* + * 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 write8_reg(void *phy_id, u8 tpm_register, u8 *tpm_data, u16 tpm_size) +{ + struct st33zp24_i2c_phy *phy = phy_id; + int ret; + phy->buf[0] = tpm_register; + memcpy(phy->buf + 1, tpm_data, tpm_size); + ret = i2c_write(phy->slave_addr, 0, 0, phy->buf, tpm_size + 1); + if (!ret) + return tpm_size + 1; + return ret; +} /* write8_reg() */ + +/* +* 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 read8_reg(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size) +{ + struct st33zp24_i2c_phy *phy = phy_id; + int status; + u8 data; + + data = TPM_DUMMY_BYTE; + status = write8_reg(phy, tpm_register, &data, 1); + if (status == 2) { + status = i2c_read(phy->slave_addr, 0, 0, tpm_data, tpm_size); + if (!status) + return tpm_size; + } + return status; +} /* read8_reg() */ + +static int tpm_select(void *phy_id) +{ + int ret; + struct st33zp24_i2c_phy *phy = phy_id; + + phy->old_bus = i2c_get_bus_num(); + if (phy->old_bus != phy->i2c_bus) { + ret = i2c_set_bus_num(phy->i2c_bus); + if (ret) { + debug("%s: Fail to set i2c bus %d\n", __func__, + phy->i2c_bus); + return -1; + } + } + + return 0; +} + +static int tpm_deselect(void *phy_id) +{ + int ret; + struct st33zp24_i2c_phy *phy = phy_id; + + if (phy->old_bus != i2c_get_bus_num()) { + ret = i2c_set_bus_num(phy->old_bus); + if (ret) { + debug("%s: Fail to restore i2c bus %d\n", + __func__, phy->old_bus); + return -1; + } + } + phy->old_bus = -1; + + return 0; +} + +/* + * st33zp24_i2c_send + * 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_send(void *phy_id, u8 tpm_register, u8 *tpm_data, + int tpm_size) +{ + int rc; + + tpm_select(phy_id); + rc = write8_reg(phy_id, tpm_register | TPM_WRITE_DIRECTION, tpm_data, + tpm_size); + tpm_deselect(phy_id); + return rc; +} + +/* + * st33zp24_i2c_recv + * 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_recv(void *phy_id, u8 tpm_register, u8 *tpm_data, + int tpm_size) +{ + int rc; + + tpm_select(phy_id); + rc = read8_reg(phy_id, tpm_register, tpm_data, tpm_size); + tpm_deselect(phy_id); + return rc; +} + +static const struct st33zp24_phy_ops i2c_phy_ops = { + .send = st33zp24_i2c_send, + .recv = st33zp24_i2c_recv, +}; + +static int st33zp24_i2c_probe(struct udevice *dev) +{ + struct st33zp24_i2c_platdata *platdata = dev_get_platdata(dev); + struct st33zp24_i2c_phy *i2c_phy = dev_get_priv(dev); + + i2c_phy->slave_addr = platdata->slave_addr; + i2c_phy->i2c_bus = platdata->i2c_bus; + + return st33zp24_init(dev, i2c_phy, &i2c_phy_ops); +} + +static int st33zp24_i2c_remove(struct udevice *dev) +{ + return st33zp24_remove(dev); +} + +#ifdef CONFIG_OF_CONTROL +static const struct udevice_id st33zp24_i2c_ids[] = { + { .compatible = "st,st33zp24-i2c" }, + { } +}; + +static int st33zp24_i2c_ofdata_to_platdata(struct udevice *dev) +{ + int node, parent, i2c_bus; + const void *blob = gd->fdt_blob; + struct st33zp24_i2c_platdata *platdata = dev_get_platdata(dev); + + node = fdtdec_next_compatible(blob, 0, + COMPAT_STMICROELECTRONICS_ST33ZP24_I2C); + if (node < 0) { + debug("%s: Node not found\n", __func__); + return -1; + } + + parent = fdt_parent_offset(blob, node); + if (parent < 0) { + debug("%s: Cannot find node parent\n", __func__); + return -1; + } + + i2c_bus = i2c_get_bus_num_fdt(parent); + if (i2c_bus < 0) + return -1; + + platdata->i2c_bus = i2c_bus; + platdata->slave_addr = fdtdec_get_addr(blob, node, "reg"); + + return 0; +} +#endif + +U_BOOT_DRIVER(st33zp24_i2c) = { + .name = "st33zp24-i2c", + .id = UCLASS_TPM, + .of_match = of_match_ptr(st33zp24_i2c_ids), + .ofdata_to_platdata = of_match_ptr(st33zp24_i2c_ofdata_to_platdata), + .probe = st33zp24_i2c_probe, + .remove = st33zp24_i2c_remove, + .priv_auto_alloc_size = sizeof(struct st33zp24_i2c_phy), + .platdata_auto_alloc_size = sizeof(struct st33zp24_i2c_platdata), +}; diff --git a/drivers/tpm/st33zp24/spi.c b/drivers/tpm/st33zp24/spi.c new file mode 100644 index 0000000..312ea07 --- /dev/null +++ b/drivers/tpm/st33zp24/spi.c @@ -0,0 +1,286 @@ +/* + * STMicroelectronics TPM ST33ZP24 SPI phy for UBOOT + * Copyright (C) 2015 STMicroelectronics + * + * Description: Device driver for ST33ZP24 SPI 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 SPI Protocol Stack Specification version 1.2.0. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <spi.h> +#include <dm.h> +#include <linux/types.h> +#include <tpm.h> +#include <errno.h> +#include <asm/unaligned.h> +#include <dm/platform_data/st33zp24_spi.h> + +#include "../tpm_private.h" +#include "st33zp24.h" + +#define TPM_DATA_FIFO 0x24 +#define TPM_INTF_CAPABILITY 0x14 + +#define TPM_DUMMY_BYTE 0x00 +#define TPM_WRITE_DIRECTION 0x80 + +#define MAX_SPI_LATENCY 15 +#define LOCALITY0 0 + +#define ST33ZP24_OK 0x5A +#define ST33ZP24_UNDEFINED_ERR 0x80 +#define ST33ZP24_BADLOCALITY 0x81 +#define ST33ZP24_TISREGISTER_UKNOWN 0x82 +#define ST33ZP24_LOCALITY_NOT_ACTIVATED 0x83 +#define ST33ZP24_HASH_END_BEFORE_HASH_START 0x84 +#define ST33ZP24_BAD_COMMAND_ORDER 0x85 +#define ST33ZP24_INCORECT_RECEIVED_LENGTH 0x86 +#define ST33ZP24_TPM_FIFO_OVERFLOW 0x89 +#define ST33ZP24_UNEXPECTED_READ_FIFO 0x8A +#define ST33ZP24_UNEXPECTED_WRITE_FIFO 0x8B +#define ST33ZP24_CMDRDY_SET_WHEN_PROCESSING_HASH_END 0x90 +#define ST33ZP24_DUMMY_BYTES 0x00 + +/* + * TPM command can be up to 2048 byte, A TPM response can be up to + * 1024 byte. + * Between command and response, there are latency byte (up to 15 + * usually on st33zp24 2 are enough). + * + * Overall when sending a command and expecting an answer we need if + * worst case: + * 2048 (for the TPM command) + 1024 (for the TPM answer). We need + * some latency byte before the answer is available (max 15). + * We have 2048 + 1024 + 15. + */ +#define ST33ZP24_SPI_BUFFER_SIZE (TPM_BUFSIZE + (TPM_BUFSIZE / 2) +\ + MAX_SPI_LATENCY) + +struct st33zp24_spi_phy { + struct spi_slave *spi_slave; + int latency; + + u8 tx_buf[ST33ZP24_SPI_BUFFER_SIZE]; + u8 rx_buf[ST33ZP24_SPI_BUFFER_SIZE]; +}; + +static int st33zp24_status_to_errno(u8 code) +{ + switch (code) { + case ST33ZP24_OK: + return 0; + case ST33ZP24_UNDEFINED_ERR: + case ST33ZP24_BADLOCALITY: + case ST33ZP24_TISREGISTER_UKNOWN: + case ST33ZP24_LOCALITY_NOT_ACTIVATED: + case ST33ZP24_HASH_END_BEFORE_HASH_START: + case ST33ZP24_BAD_COMMAND_ORDER: + case ST33ZP24_UNEXPECTED_READ_FIFO: + case ST33ZP24_UNEXPECTED_WRITE_FIFO: + case ST33ZP24_CMDRDY_SET_WHEN_PROCESSING_HASH_END: + return -EPROTO; + case ST33ZP24_INCORECT_RECEIVED_LENGTH: + case ST33ZP24_TPM_FIFO_OVERFLOW: + return -EMSGSIZE; + case ST33ZP24_DUMMY_BYTES: + return -ENOSYS; + } + return code; +} + +/* + * st33zp24_spi_send + * Send byte to TPM register according to the ST33ZP24 SPI protocol. + * @param: tpm, the chip 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: should be zero if success else a negative error code. + */ +static int st33zp24_spi_send(void *phy_id, u8 tpm_register, u8 *tpm_data, + int tpm_size) +{ + int total_length = 0, ret; + struct st33zp24_spi_phy *phy = phy_id; + + struct spi_slave *dev = phy->spi_slave; + u8 *tx_buf = (u8 *)phy->tx_buf; + u8 *rx_buf = phy->rx_buf; + + tx_buf[total_length++] = TPM_WRITE_DIRECTION | LOCALITY0; + tx_buf[total_length++] = tpm_register; + + if (tpm_size > 0 && tpm_register == TPM_DATA_FIFO) { + tx_buf[total_length++] = tpm_size >> 8; + tx_buf[total_length++] = tpm_size; + } + memcpy(tx_buf + total_length, tpm_data, tpm_size); + total_length += tpm_size; + + memset(tx_buf + total_length, TPM_DUMMY_BYTE, phy->latency); + + total_length += phy->latency; + + spi_claim_bus(dev); + ret = spi_xfer(dev, total_length * 8, tx_buf, rx_buf, + SPI_XFER_BEGIN | SPI_XFER_END); + spi_release_bus(dev); + + if (ret == 0) + ret = rx_buf[total_length - 1]; + + return st33zp24_status_to_errno(ret); +} /* st33zp24_spi_send() */ + +/* + * spi_read8_reg + * Recv byte from the TIS register according to the ST33ZP24 SPI protocol. + * @param: tpm, the chip description + * @param: tpm_loc, the locality to read register from + * @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: should be zero if success else a negative error code. + */ +static u8 read8_reg(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size) +{ + int total_length = 0, nbr_dummy_bytes, ret; + struct st33zp24_spi_phy *phy = phy_id; + struct spi_slave *dev = phy->spi_slave; + u8 *tx_buf = (u8 *)phy->tx_buf; + u8 *rx_buf = phy->rx_buf; + + /* Pre-Header */ + tx_buf[total_length++] = LOCALITY0; + tx_buf[total_length++] = tpm_register; + + nbr_dummy_bytes = phy->latency; + memset(&tx_buf[total_length], TPM_DUMMY_BYTE, + nbr_dummy_bytes + tpm_size); + total_length += nbr_dummy_bytes + tpm_size; + + spi_claim_bus(dev); + ret = spi_xfer(dev, total_length * 8, tx_buf, rx_buf, + SPI_XFER_BEGIN | SPI_XFER_END); + spi_release_bus(dev); + + if (tpm_size > 0 && ret == 0) { + ret = rx_buf[total_length - tpm_size - 1]; + memcpy(tpm_data, rx_buf + total_length - tpm_size, tpm_size); + } + return ret; +} /* read8_reg() */ + +/* + * st33zp24_spi_recv + * Recv byte from the TIS register according to the ST33ZP24 SPI 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_spi_recv(void *phy_id, u8 tpm_register, u8 *tpm_data, + int tpm_size) +{ + int ret; + + ret = read8_reg(phy_id, tpm_register, tpm_data, tpm_size); + if (!st33zp24_status_to_errno(ret)) + return tpm_size; + return ret; +} /* st33zp24_spi_recv() */ + +static int evaluate_latency(void *phy_id) +{ + struct st33zp24_spi_phy *phy = phy_id; + int latency = 1, status = 0; + u8 data = 0; + + while (!status && latency < MAX_SPI_LATENCY) { + phy->latency = latency; + status = read8_reg(phy_id, TPM_INTF_CAPABILITY, &data, 1); + latency++; + } + return latency - 1; +} /* evaluate_latency() */ + +static const struct st33zp24_phy_ops spi_phy_ops = { + .send = st33zp24_spi_send, + .recv = st33zp24_spi_recv, +}; + +static int st33zp24_spi_probe(struct udevice *dev) +{ + struct st33zp24_spi_platdata *platdata = dev_get_platdata(dev); + struct st33zp24_spi_phy *spi_phy = dev_get_priv(dev); + + #ifndef CONFIG_OF_CONTROL + spi_phy->spi_slave = spi_setup_slave(platdata->bus_num, + platdata->cs, + platdata->max_speed, + platdata->mode); + #endif + + spi_phy->latency = evaluate_latency(spi_phy); + if (spi_phy->latency <= 0) + return -ENODEV; + + return st33zp24_init(dev, spi_phy, &spi_phy_ops); +} /* st33zp24_spi_probe() */ + +static int st33zp24_spi_remove(struct udevice *dev) +{ + return st33zp24_remove(dev); +} + +#ifdef CONFIG_OF_CONTROL +static const struct udevice_id st33zp24_spi_ids[] = { + { .compatible = "st,st33zp24-spi" }, + { } +}; + +static int st33zp24_spi_ofdata_to_platdata(struct udevice *dev) +{ + int node, parent; + int i2c_bus; + const void *blob = gd->fdt_blob; + struct st33zp24_spi_platdata *platdata = dev_get_platdata(dev); + struct st33zp24_spi_phy *spi_phy = dev_get_priv(dev); + + node = fdtdec_next_compatible(blob, 0, + COMPAT_STMICROELECTRONICS_ST33ZP24_SPI); + if (node < 0) { + debug("%s: Node not found\n", __func__); + return -1; + } + + parent = fdt_parent_offset(blob, node); + if (parent < 0) { + debug("%s: Cannot find node parent\n", __func__); + return -1; + } + + spi_phy->spi_slave = spi_setup_slave_fdt(blob, node, parent); + if (!spi_phy->spi_slave) + return -1; + + return 0; +} +#endif + +U_BOOT_DRIVER(st33zp24_spi) = { + .name = "st33zp24-spi", + .id = UCLASS_TPM, + .of_match = of_match_ptr(st33zp24_spi_ids), + .ofdata_to_platdata = of_match_ptr(st33zp24_spi_ofdata_to_platdata), + .probe = st33zp24_spi_probe, + .remove = st33zp24_spi_remove, + .priv_auto_alloc_size = sizeof(struct st33zp24_spi_phy), + .platdata_auto_alloc_size = sizeof(struct st33zp24_spi_platdata), +}; diff --git a/drivers/tpm/st33zp24/st33zp24.c b/drivers/tpm/st33zp24/st33zp24.c new file mode 100644 index 0000000..862b98a --- /dev/null +++ b/drivers/tpm/st33zp24/st33zp24.c @@ -0,0 +1,454 @@ +/* + * STMicroelectronics TPM ST33ZP24 UBOOT driver + * + * Copyright (C) 2015 STMicroelectronics + * + * Description: Device driver for ST33ZP24 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. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <linux/types.h> +#include <linux/compat.h> +#include <malloc.h> +#include <tpm.h> +#include <dm.h> +#include <errno.h> +#include <asm/unaligned.h> + +#include "st33zp24.h" +#include "../tpm_private.h" + +#define TPM_ACCESS 0x0 +#define TPM_STS 0x18 +#define TPM_DATA_FIFO 0x24 + +#define LOCALITY0 0 + +enum st33zp24_access { + TPM_ACCESS_VALID = 0x80, + TPM_ACCESS_ACTIVE_LOCALITY = 0x20, + TPM_ACCESS_REQUEST_PENDING = 0x04, + TPM_ACCESS_REQUEST_USE = 0x02, +}; + +enum st33zp24_status { + TPM_STS_VALID = 0x80, + TPM_STS_COMMAND_READY = 0x40, + TPM_STS_GO = 0x20, + TPM_STS_DATA_AVAIL = 0x10, + TPM_STS_DATA_EXPECT = 0x08, +}; + +enum st33zp24_int_flags { + TPM_GLOBAL_INT_ENABLE = 0x80, + TPM_INTF_CMD_READY_INT = 0x080, + TPM_INTF_FIFO_AVALAIBLE_INT = 0x040, + TPM_INTF_WAKE_UP_READY_INT = 0x020, + TPM_INTF_LOCTPM_BUFSIZE4SOFTRELEASE_INT = 0x008, + TPM_INTF_LOCALITY_CHANGE_INT = 0x004, + TPM_INTF_STS_VALID_INT = 0x002, + TPM_INTF_DATA_AVAIL_INT = 0x001, +}; + +enum tis_defaults { + TIS_SHORT_TIMEOUT = 750, /* ms */ + TIS_LONG_TIMEOUT = 2000, /* 2 sec */ +}; + +struct st33zp24_dev { + void *phy_id; + const struct st33zp24_phy_ops *ops; +}; + +/* + * release_locality release the active locality + * @param: chip, the tpm chip description. + */ +static void release_locality(struct tpm_chip *chip) +{ + struct st33zp24_dev *tpm_dev; + u8 data = TPM_ACCESS_ACTIVE_LOCALITY; + + tpm_dev = (struct st33zp24_dev *)TPM_VPRIV(chip); + + tpm_dev->ops->send(tpm_dev->phy_id, TPM_ACCESS, &data, 1); +} /* release_locality() */ + +/* + * check_locality if the locality is active + * @param: chip, the tpm chip description + * @return: the active locality or -EACCES. + */ +static int check_locality(struct tpm_chip *chip) +{ + struct st33zp24_dev *tpm_dev; + u8 data; + u8 status; + + tpm_dev = (struct st33zp24_dev *)TPM_VPRIV(chip); + + status = tpm_dev->ops->recv(tpm_dev->phy_id, TPM_ACCESS, &data, 1); + if (status && (data & + (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) == + (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) + return chip->vendor.locality; + + return -EACCES; +} /* check_locality() */ + +/* + * request_locality request the TPM locality + * @param: chip, the chip description + * @return: the active locality or negative value. + */ +static int request_locality(struct tpm_chip *chip) +{ + unsigned long start, stop; + long ret; + struct st33zp24_dev *tpm_dev; + u8 data; + + if (check_locality(chip) == chip->vendor.locality) + return chip->vendor.locality; + + tpm_dev = (struct st33zp24_dev *)TPM_VPRIV(chip); + + data = TPM_ACCESS_REQUEST_USE; + ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_ACCESS, &data, 1); + if (ret < 0) + return ret; + + /* wait for locality activated */ + start = get_timer(0); + stop = chip->vendor.timeout_a; + do { + if (check_locality(chip) >= 0) + return chip->vendor.locality; + udelay(TPM_TIMEOUT * 1000); + } while (get_timer(start) < stop); + + return -EACCES; +} /* request_locality() */ + +/* + * st33zp24_status return the TPM_STS register + * @param: chip, the tpm chip description + * @return: the TPM_STS register value. + */ +static u8 st33zp24_status(struct tpm_chip *chip) +{ + struct st33zp24_dev *tpm_dev; + u8 data; + + tpm_dev = (struct st33zp24_dev *)TPM_VPRIV(chip); + + tpm_dev->ops->recv(tpm_dev->phy_id, TPM_STS, &data, 1); + return data; +} /* st33zp24_status() */ + +/* + * 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 get_burstcount(struct tpm_chip *chip) +{ + unsigned long start, stop; + int burstcnt, status; + u8 tpm_reg, temp; + struct st33zp24_dev *tpm_dev; + + tpm_dev = (struct st33zp24_dev *)TPM_VPRIV(chip); + + /* wait for burstcount */ + start = get_timer(0); + stop = chip->vendor.timeout_d; + do { + tpm_reg = TPM_STS + 1; + status = tpm_dev->ops->recv(tpm_dev->phy_id, tpm_reg, &temp, 1); + if (status < 0) + return -EBUSY; + + tpm_reg = TPM_STS + 2; + burstcnt = temp; + status = tpm_dev->ops->recv(tpm_dev->phy_id, tpm_reg, &temp, 1); + if (status < 0) + return -EBUSY; + + burstcnt |= temp << 8; + if (burstcnt) + return burstcnt; + udelay(TIS_SHORT_TIMEOUT * 1000); + } while (get_timer(start) < stop); + return -EBUSY; +} /* get_burstcount() */ + +/* + * st33zp24_cancel, cancel the current command execution or + * set STS to COMMAND READY. + * @param: chip, tpm_chip description. + */ +static void st33zp24_cancel(struct tpm_chip *chip) +{ + struct st33zp24_dev *tpm_dev; + u8 data; + + tpm_dev = (struct st33zp24_dev *)TPM_VPRIV(chip); + + data = TPM_STS_COMMAND_READY; + tpm_dev->ops->send(tpm_dev->phy_id, TPM_STS, &data, 1); +} /* st33zp24_cancel() */ + +/* + * 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 wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout, + int *status) +{ + unsigned long start, stop; + + /* Check current status */ + *status = st33zp24_status(chip); + if ((*status & mask) == mask) + return 0; + + start = get_timer(0); + stop = timeout; + do { + udelay(TPM_TIMEOUT * 1000); + *status = st33zp24_status(chip); + if ((*status & mask) == mask) + return 0; + } while (get_timer(start) < stop); + + return -ETIME; +} /* wait_for_stat() */ + +/* + * 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 recv_data(struct tpm_chip *chip, u8 *buf, size_t count) +{ + int size = 0, burstcnt, len, ret, status; + struct st33zp24_dev *tpm_dev; + + tpm_dev = (struct st33zp24_dev *)TPM_VPRIV(chip); + + while (size < count && + wait_for_stat(chip, + TPM_STS_DATA_AVAIL | TPM_STS_VALID, + chip->vendor.timeout_c, &status) == 0) { + burstcnt = get_burstcount(chip); + if (burstcnt < 0) + return burstcnt; + len = min_t(int, burstcnt, count - size); + ret = tpm_dev->ops->recv(tpm_dev->phy_id, TPM_DATA_FIFO, + buf + size, len); + if (ret < 0) + return ret; + + size += len; + } + return size; +} /* recv_data() */ + +/* + * st33zp24_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_recv(struct tpm_chip *chip, unsigned char *buf, + size_t count) +{ + int size = 0; + int expected; + + if (!chip) + return -ENODEV; + + if (count < TPM_HEADER_SIZE) { + size = -EIO; + goto out; + } + + size = recv_data(chip, buf, TPM_HEADER_SIZE); + if (size < TPM_HEADER_SIZE) { + printf("TPM error, unable to read header\n"); + goto out; + } + + expected = get_unaligned_be32(buf + 2); + if (expected > count) { + size = -EIO; + goto out; + } + + size += recv_data(chip, &buf[TPM_HEADER_SIZE], + expected - TPM_HEADER_SIZE); + if (size < expected) { + printf("TPM error, unable to read remaining bytes of result\n"); + size = -EIO; + goto out; + } + +out: + st33zp24_cancel(chip); + release_locality(chip); + return size; +} /* st33zp24_recv() */ + +/* + * st33zp24_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_send(struct tpm_chip *chip, u8 *buf, + size_t len) +{ + u32 i, size; + int burstcnt, ret, status; + u8 data, tpm_stat; + struct st33zp24_dev *tpm_dev; + + if (!chip) + return -ENODEV; + if (len < TPM_HEADER_SIZE) + return -EIO; + + tpm_dev = (struct st33zp24_dev *)TPM_VPRIV(chip); + + ret = request_locality(chip); + if (ret < 0) + return ret; + + tpm_stat = st33zp24_status(chip); + if ((tpm_stat & TPM_STS_COMMAND_READY) == 0) { + st33zp24_cancel(chip); + if (wait_for_stat(chip, TPM_STS_COMMAND_READY, + chip->vendor.timeout_b, &status) < 0) { + ret = -ETIME; + goto out_err; + } + } + + for (i = 0; i < len - 1;) { + burstcnt = get_burstcount(chip); + if (burstcnt < 0) + return burstcnt; + size = min_t(int, len - i - 1, burstcnt); + ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_DATA_FIFO, + buf + i, size); + if (ret < 0) + goto out_err; + + i += size; + } + + tpm_stat = st33zp24_status(chip); + if ((tpm_stat & TPM_STS_DATA_EXPECT) == 0) { + ret = -EIO; + goto out_err; + } + + ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_DATA_FIFO, + buf + len - 1, 1); + if (ret < 0) + goto out_err; + + tpm_stat = st33zp24_status(chip); + if ((tpm_stat & TPM_STS_DATA_EXPECT) != 0) { + ret = -EIO; + goto out_err; + } + + data = TPM_STS_GO; + ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_STS, &data, 1); + if (ret < 0) + goto out_err; + + return len; + +out_err: + st33zp24_cancel(chip); + release_locality(chip); + return ret; +} /* st33zp24_send() */ + +static struct tpm_vendor_specific st33zp24_tpm = { + .recv = st33zp24_recv, + .send = st33zp24_send, + .cancel = st33zp24_cancel, + .status = st33zp24_status, + .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID, + .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID, + .req_canceled = TPM_STS_COMMAND_READY, +}; + +int st33zp24_init(struct udevice *dev, void *phy_id, + const struct st33zp24_phy_ops *ops) +{ + int ret; + struct tpm_chip *chip; + struct st33zp24_dev *tpm_dev; + + chip = tpm_register_hardware(dev, &st33zp24_tpm); + if (chip < 0) { + ret = -ENODEV; + goto out_err; + } + + tpm_dev = (struct st33zp24_dev *)malloc(sizeof(struct st33zp24_dev)); + if (!tpm_dev) { + ret = -ENODEV; + goto out_err; + } + + /* Disable interrupts (not supported) */ + chip->vendor.irq = 0; + + /* Default timeouts */ + chip->vendor.timeout_a = TIS_SHORT_TIMEOUT; + chip->vendor.timeout_b = TIS_LONG_TIMEOUT; + chip->vendor.timeout_c = TIS_SHORT_TIMEOUT; + chip->vendor.timeout_d = TIS_SHORT_TIMEOUT; + + chip->vendor.locality = LOCALITY0; + TPM_VPRIV(chip) = tpm_dev; + tpm_dev->phy_id = phy_id; + tpm_dev->ops = ops; + + printf("ST33ZP24 TPM from STMicroelectronics found\n"); + return 0; + +out_err: + return ret; +} + +int st33zp24_remove(struct udevice *dev) +{ + struct tpm_chip *chip = dev_get_uclass_priv(dev); + struct st33zp24_dev *tpm_dev = TPM_VPRIV(chip); + + release_locality(chip); + free(tpm_dev); + return 0; +} diff --git a/drivers/tpm/st33zp24/st33zp24.h b/drivers/tpm/st33zp24/st33zp24.h new file mode 100644 index 0000000..4be06cb --- /dev/null +++ b/drivers/tpm/st33zp24/st33zp24.h @@ -0,0 +1,29 @@ +/* + * STMicroelectronics TPM UBOOT driver for TPM ST33ZP24 + * + * Copyright (C) 2015 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. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef __LOCAL_ST33ZP24_H__ +#define __LOCAL_ST33ZP24_H__ + +#define TPM_WRITE_DIRECTION 0x80 +#define TPM_HEADER_SIZE 10 + +struct st33zp24_phy_ops { + int (*send)(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size); + int (*recv)(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size); +}; + +int st33zp24_init(struct udevice *dev, void *phy_id, + const struct st33zp24_phy_ops *ops); +int st33zp24_remove(struct udevice *dev); +#endif /* __LOCAL_ST33ZP24_H__ */ diff --git a/include/dm/platform_data/st33zp24_i2c.h b/include/dm/platform_data/st33zp24_i2c.h new file mode 100644 index 0000000..e71c9e3 --- /dev/null +++ b/include/dm/platform_data/st33zp24_i2c.h @@ -0,0 +1,28 @@ +/* + * STMicroelectronics TPM Linux driver for TPM 1.2 ST33ZP24 + * Copyright (C) 2009 - 2015 STMicroelectronics + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see http://www.gnu.org/licenses/. + */ +#ifndef __ST33ZP24_I2C_H__ +#define __ST33ZP24_I2C_H__ + +#define TPM_ST33ZP24_I2C "st33zp24-i2c" + +struct st33zp24_i2c_platdata { + int i2c_bus; + uint8_t slave_addr; +} __packed; + +#endif /* __ST33ZP24_I2C_H__ */ diff --git a/include/dm/platform_data/st33zp24_spi.h b/include/dm/platform_data/st33zp24_spi.h new file mode 100644 index 0000000..82f560b --- /dev/null +++ b/include/dm/platform_data/st33zp24_spi.h @@ -0,0 +1,30 @@ +/* + * STMicroelectronics TPM Linux driver for TPM 1.2 ST33ZP24 + * Copyright (C) 2009 - 2015 STMicroelectronics + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see http://www.gnu.org/licenses/. + */ +#ifndef __ST33ZP24_SPI_H__ +#define __ST33ZP24_SPI_H__ + +#define TPM_ST33ZP24_SPI "st33zp24-spi" + +struct st33zp24_spi_platdata { + int bus_num; + int cs; + int max_speed; + int mode; +}; + +#endif /* __ST33ZP24_SPI_H__ */ diff --git a/include/fdtdec.h b/include/fdtdec.h index eac679e..9eb2b3d 100644 --- a/include/fdtdec.h +++ b/include/fdtdec.h @@ -182,7 +182,10 @@ enum fdt_compat_id { COMPAT_INTEL_PCH, /* Intel PCH */ COMPAT_INTEL_IRQ_ROUTER, /* Intel Interrupt Router */ COMPAT_ALTERA_SOCFPGA_DWMAC, /* SoCFPGA Ethernet controller */ - + COMPAT_STMICROELECTRONICS_ST33ZP24_I2C, + /* STMicroelectronics ST33ZP24 I2C TPM */ + COMPAT_STMICROELECTRONICS_ST33ZP24_SPI, + /* STMicroelectronics ST33ZP24 SPI TPM */ COMPAT_COUNT, };
diff --git a/lib/fdtdec.c b/lib/fdtdec.c index b201787..55c64a0 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -76,6 +76,8 @@ static const char * const compat_names[COMPAT_COUNT] = { COMPAT(COMPAT_INTEL_PCH, "intel,bd82x6x"), COMPAT(COMPAT_INTEL_IRQ_ROUTER, "intel,irq-router"), COMPAT(ALTERA_SOCFPGA_DWMAC, "altr,socfpga-stmmac"), + COMPAT(STMICROELECTRONICS_ST33ZP24_I2C, "st,st33zp24-i2c"), + COMPAT(STMICROELECTRONICS_ST33ZP24_SPI, "st,st33zp24-spi"), };
const char *fdtdec_get_compatible(enum fdt_compat_id id)