diff options
Diffstat (limited to 'src/drivers')
| -rw-r--r-- | src/drivers/i2c/tpm/Kconfig | 18 | ||||
| -rw-r--r-- | src/drivers/i2c/tpm/Makefile.inc | 19 | ||||
| -rw-r--r-- | src/drivers/i2c/tpm/cr50.c | 466 | ||||
| -rw-r--r-- | src/drivers/i2c/tpm/tpm.c | 242 |
4 files changed, 508 insertions, 237 deletions
diff --git a/src/drivers/i2c/tpm/Kconfig b/src/drivers/i2c/tpm/Kconfig index 903fc3bbe5..1725eaf0ff 100644 --- a/src/drivers/i2c/tpm/Kconfig +++ b/src/drivers/i2c/tpm/Kconfig @@ -2,6 +2,24 @@ config I2C_TPM bool "I2C TPM" depends on TPM || TPM2 +config MAINBOARD_HAS_I2C_TPM_CR50 + bool + default n + +choice + prompt "I2C TPM Driver" + default I2C_TPM_CR50 if MAINBOARD_HAS_I2C_TPM_CR50 + default I2C_TPM_GENERIC if !MAINBOARD_HAS_I2C_TPM_CR50 + depends on I2C_TPM + +config I2C_TPM_GENERIC + bool "Generic I2C TPM Driver" + +config I2C_TPM_CR50 + bool "CR50 I2C TPM Driver" + +endchoice + config DRIVER_TPM_I2C_BUS hex "I2C TPM chip bus" default 9 # FIXME, workaround for Kconfig BS diff --git a/src/drivers/i2c/tpm/Makefile.inc b/src/drivers/i2c/tpm/Makefile.inc index 3eb5de0518..7fcfc78d56 100644 --- a/src/drivers/i2c/tpm/Makefile.inc +++ b/src/drivers/i2c/tpm/Makefile.inc @@ -1,6 +1,17 @@ -ramstage-$(CONFIG_I2C_TPM) += tis.c tpm.c -romstage-$(CONFIG_I2C_TPM) += tis.c tpm.c -verstage-$(CONFIG_I2C_TPM) += tis.c tpm.c -bootblock-$(CONFIG_I2C_TPM) += tis.c tpm.c + +ramstage-$(CONFIG_I2C_TPM) += tis.c +romstage-$(CONFIG_I2C_TPM) += tis.c +verstage-$(CONFIG_I2C_TPM) += tis.c +bootblock-$(CONFIG_I2C_TPM) += tis.c + +ramstage-$(CONFIG_I2C_TPM_GENERIC) += tpm.c +romstage-$(CONFIG_I2C_TPM_GENERIC) += tpm.c +verstage-$(CONFIG_I2C_TPM_GENERIC) += tpm.c +bootblock-$(CONFIG_I2C_TPM_GENERIC) += tpm.c + +ramstage-$(CONFIG_I2C_TPM_CR50) += cr50.c +romstage-$(CONFIG_I2C_TPM_CR50) += cr50.c +verstage-$(CONFIG_I2C_TPM_CR50) += cr50.c +bootblock-$(CONFIG_I2C_TPM_CR50) += cr50.c ramstage-$(CONFIG_DRIVER_I2C_TPM_ACPI) += chip.c diff --git a/src/drivers/i2c/tpm/cr50.c b/src/drivers/i2c/tpm/cr50.c new file mode 100644 index 0000000000..419ac1e68f --- /dev/null +++ b/src/drivers/i2c/tpm/cr50.c @@ -0,0 +1,466 @@ +/* + * Copyright 2016 Google Inc. + * + * Based on Linux Kernel TPM driver by + * Peter Huewe <peter.huewe@infineon.com> + * Copyright (C) 2011 Infineon Technologies + * + * 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, version 2 of the + * License. + * + * 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. + */ + +/* + * cr50 is a TPM 2.0 capable device that requries special + * handling for the I2C interface. + * + * - Use an interrupt for transaction status instead of hardcoded delays + * - Must use write+wait+read read protocol + * - All 4 bytes of status register must be read/written at once + * - Burst count max is 63 bytes, and burst count behaves + * slightly differently than other I2C TPMs + * - When reading from FIFO the full burstcnt must be read + * instead of just reading header and determining the remainder + */ + +#include <arch/early_variables.h> +#include <commonlib/endian.h> +#include <stdint.h> +#include <string.h> +#include <types.h> +#include <delay.h> +#include <console/console.h> +#include <device/i2c.h> +#include <endian.h> +#include <timer.h> +#include "tpm.h" + +#define CR50_MAX_BURSTCOUNT 63 + +#define SLEEP_DURATION 60 /* in usec */ +#define SLEEP_DURATION_LONG 210 /* in usec */ +#define SLEEP_DURATION_SAFE 750 /* in usec */ +#define SLEEP_DURATION_PROBE_MS 1000 /* in msec */ + +#define CR50_DID_VID 0x00281ae0L + +struct tpm_inf_dev { + int bus; + unsigned int addr; + uint8_t buf[TPM_BUFSIZE + sizeof(uint8_t)]; +}; + +static struct tpm_inf_dev g_tpm_dev CAR_GLOBAL; + +/* + * iic_tpm_read() - read from TPM register + * + * @addr: register address to read from + * @buffer: provided by caller + * @len: number of bytes to read + * + * 1) send register address byte 'addr' to the TPM + * 2) wait for TPM to indicate it is ready + * 3) read 'len' bytes of TPM response into the provided 'buffer' + * + * Return -1 on error, 0 on success. + */ +static int iic_tpm_read(uint8_t addr, uint8_t *buffer, size_t len) +{ + struct tpm_inf_dev *tpm_dev = car_get_var_ptr(&g_tpm_dev); + + if (tpm_dev->addr == 0) + return -1; + + /* Send the register address byte to the TPM */ + if (i2c_write_raw(tpm_dev->bus, tpm_dev->addr, &addr, 1)) { + printk(BIOS_ERR, "%s: Address write failed\n", __func__); + return -1; + } + + /* Wait for TPM to be ready with response data */ + udelay(SLEEP_DURATION_SAFE); + + /* Read response data from the TPM */ + if (i2c_read_raw(tpm_dev->bus, tpm_dev->addr, buffer, len)) { + printk(BIOS_ERR, "%s: Read response failed\n", __func__); + return -1; + } + + return 0; +} + +/* + * iic_tpm_write() - write to TPM register + * + * @addr: register address to write to + * @buffer: data to write + * @len: number of bytes to write + * + * 1) prepend the provided address to the provided data + * 2) send the address+data to the TPM + * 3) wait for TPM to indicate it is done writing + * + * Returns -1 on error, 0 on success. + */ +static int iic_tpm_write(uint8_t addr, uint8_t *buffer, size_t len) +{ + struct tpm_inf_dev *tpm_dev = car_get_var_ptr(&g_tpm_dev); + + if (tpm_dev->addr == 0) + return -1; + if (len > TPM_BUFSIZE) + return -1; + + /* Prepend the 'register address' to the buffer */ + tpm_dev->buf[0] = addr; + memcpy(tpm_dev->buf + 1, buffer, len); + + /* Send write request buffer with address */ + if (i2c_write_raw(tpm_dev->bus, tpm_dev->addr, tpm_dev->buf, len + 1)) { + printk(BIOS_ERR, "%s: Error writing to TPM\n", __func__); + return -1; + } + + /* Wait for TPM to be ready */ + udelay(SLEEP_DURATION_SAFE); + + return 0; +} + +static int check_locality(struct tpm_chip *chip, int loc) +{ + uint8_t buf; + + if (iic_tpm_read(TPM_ACCESS(loc), &buf, 1) < 0) + return -1; + + if ((buf & (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) == + (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) { + chip->vendor.locality = loc; + return loc; + } + + return -1; +} + +static void release_locality(struct tpm_chip *chip, int loc, int force) +{ + uint8_t buf; + if (iic_tpm_read(TPM_ACCESS(loc), &buf, 1) < 0) + return; + + if (force || (buf & (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) == + (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) { + buf = TPM_ACCESS_ACTIVE_LOCALITY; + iic_tpm_write(TPM_ACCESS(loc), &buf, 1); + } +} + +static int request_locality(struct tpm_chip *chip, int loc) +{ + uint8_t buf = TPM_ACCESS_REQUEST_USE; + + if (check_locality(chip, loc) >= 0) + return loc; /* we already have the locality */ + + iic_tpm_write(TPM_ACCESS(loc), &buf, 1); + + /* wait for burstcount */ + int timeout = 2 * 1000; /* 2s timeout */ + while (timeout) { + if (check_locality(chip, loc) >= 0) + return loc; + mdelay(TPM_TIMEOUT); + timeout--; + } + + return -1; +} + +/* cr50 requires all 4 bytes of status register to be read */ +static uint8_t cr50_tis_i2c_status(struct tpm_chip *chip) +{ + uint8_t buf[4]; + if (iic_tpm_read(TPM_STS(chip->vendor.locality), + buf, sizeof(buf)) < 0) { + printk(BIOS_ERR, "%s: Failed to read status\n", __func__); + return 0; + } + return buf[0]; +} + +/* cr50 requires all 4 bytes of status register to be written */ +static void cr50_tis_i2c_ready(struct tpm_chip *chip) +{ + uint8_t buf[4] = { TPM_STS_COMMAND_READY }; + iic_tpm_write(TPM_STS(chip->vendor.locality), buf, sizeof(buf)); +} + +/* cr50 uses bytes 3:2 of status register for burst count and + * all 4 bytes must be read */ +static int cr50_wait_burst_status(struct tpm_chip *chip, uint8_t mask, + size_t *burst, int *status) +{ + uint8_t buf[4]; + struct stopwatch sw; + + stopwatch_init_msecs_expire(&sw, 2000); + + while (!stopwatch_expired(&sw)) { + if (iic_tpm_read(TPM_STS(chip->vendor.locality), + buf, sizeof(buf)) != 0) { + printk(BIOS_WARNING, "%s: Read failed\n", __func__); + udelay(SLEEP_DURATION_SAFE); + continue; + } + + *status = buf[0]; + *burst = read_le16(&buf[1]); + + /* Check if mask matches and burst is valid */ + if ((*status & mask) == mask && + *burst > 0 && *burst <= CR50_MAX_BURSTCOUNT) + return 0; + + udelay(SLEEP_DURATION_SAFE); + } + + printk(BIOS_ERR, "%s: Timeout reading burst and status\n", __func__); + return -1; +} + +static int cr50_tis_i2c_recv(struct tpm_chip *chip, uint8_t *buf, + size_t buf_len) +{ + size_t burstcnt, current, len, expected; + uint8_t addr = TPM_DATA_FIFO(chip->vendor.locality); + int status; + int ret = -1; + + if (buf_len < TPM_HEADER_SIZE) + goto out; + + if (cr50_wait_burst_status(chip, TPM_STS_VALID, &burstcnt, &status) < 0) + goto out; + if (!(status & TPM_STS_DATA_AVAIL)) { + printk(BIOS_ERR, "%s: First chunk not available\n", __func__); + goto out; + } + + /* Read first chunk of burstcnt bytes */ + if (iic_tpm_read(addr, buf, burstcnt) != 0) { + printk(BIOS_ERR, "%s: Read failed\n", __func__); + goto out; + } + + /* Determine expected data in the return buffer */ + expected = read_be32(buf + TPM_RSP_SIZE_BYTE); + if (expected > buf_len) { + printk(BIOS_ERR, "%s: Too much data: %zu > %zu\n", + __func__, expected, buf_len); + goto out; + } + + /* Now read the rest of the data */ + current = burstcnt; + while (current < expected) { + /* Read updated burst count and check status */ + if (cr50_wait_burst_status(chip, TPM_STS_VALID, + &burstcnt, &status) < 0) + goto out; + if (!(status & TPM_STS_DATA_AVAIL)) { + printk(BIOS_ERR, "%s: Data not available\n", __func__); + goto out; + } + + len = min(burstcnt, expected - current); + if (iic_tpm_read(addr, buf + current, len) != 0) { + printk(BIOS_ERR, "%s: Read failed\n", __func__); + goto out; + } + + current += len; + } + + /* Ensure TPM is done reading data */ + if (cr50_wait_burst_status(chip, TPM_STS_VALID, &burstcnt, &status) < 0) + goto out; + if (status & TPM_STS_DATA_AVAIL) { + printk(BIOS_ERR, "%s: Data still available\n", __func__); + goto out; + } + + ret = current; + +out: + return ret; +} + +static int cr50_tis_i2c_send(struct tpm_chip *chip, uint8_t *buf, size_t len) +{ + int status; + size_t burstcnt, limit, sent = 0; + uint8_t tpm_go[4] = { TPM_STS_GO }; + struct stopwatch sw; + + if (len > TPM_BUFSIZE) + return -1; + + stopwatch_init_msecs_expire(&sw, 2000); + + /* Wait until TPM is ready for a command */ + while (!(cr50_tis_i2c_status(chip) & TPM_STS_COMMAND_READY)) { + if (stopwatch_expired(&sw)) { + printk(BIOS_ERR, "%s: Command ready timeout\n", + __func__); + return -1; + } + + cr50_tis_i2c_ready(chip); + udelay(SLEEP_DURATION_SAFE); + } + + while (len > 0) { + /* Read burst count and check status */ + if (cr50_wait_burst_status(chip, TPM_STS_VALID, + &burstcnt, &status) < 0) + goto out; + if (sent > 0 && !(status & TPM_STS_DATA_EXPECT)) { + printk(BIOS_ERR, "%s: Data not expected\n", __func__); + goto out; + } + + /* Use burstcnt - 1 to account for the address byte + * that is inserted by iic_tpm_write() */ + limit = min(burstcnt - 1, len); + if (iic_tpm_write(TPM_DATA_FIFO(chip->vendor.locality), + &buf[sent], limit) != 0) { + printk(BIOS_ERR, "%s: Write failed\n", __func__); + goto out; + } + + sent += limit; + len -= limit; + } + + /* Ensure TPM is not expecting more data */ + if (cr50_wait_burst_status(chip, TPM_STS_VALID, &burstcnt, &status) < 0) + goto out; + if (status & TPM_STS_DATA_EXPECT) { + printk(BIOS_ERR, "%s: Data still expected\n", __func__); + goto out; + } + + /* Start the TPM command */ + if (iic_tpm_write(TPM_STS(chip->vendor.locality), tpm_go, + sizeof(tpm_go)) < 0) { + printk(BIOS_ERR, "%s: Start command failed\n", __func__); + goto out; + } + return sent; + +out: + /* Abort current transaction if still pending */ + if (cr50_tis_i2c_status(chip) & TPM_STS_COMMAND_READY) + cr50_tis_i2c_ready(chip); + return -1; +} + +static void cr50_vendor_init(struct tpm_chip *chip) +{ + memset(&chip->vendor, 0, sizeof(struct tpm_vendor_specific)); + chip->vendor.req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID; + chip->vendor.req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID; + chip->vendor.req_canceled = TPM_STS_COMMAND_READY; + chip->vendor.status = &cr50_tis_i2c_status; + chip->vendor.recv = &cr50_tis_i2c_recv; + chip->vendor.send = &cr50_tis_i2c_send; + chip->vendor.cancel = &cr50_tis_i2c_ready; +} + +int tpm_vendor_probe(unsigned bus, uint32_t addr) +{ + struct tpm_inf_dev *tpm_dev = car_get_var_ptr(&g_tpm_dev); + struct stopwatch sw; + uint8_t buf = 0; + int ret; + long sw_run_duration = SLEEP_DURATION_PROBE_MS; + + tpm_dev->bus = bus; + tpm_dev->addr = addr; + + /* Wait for TPM_ACCESS register ValidSts bit to be set */ + stopwatch_init_msecs_expire(&sw, sw_run_duration); + do { + ret = iic_tpm_read(TPM_ACCESS(0), &buf, 1); + if (!ret && (buf & TPM_STS_VALID)) { + sw_run_duration = stopwatch_duration_msecs(&sw); + break; + } + udelay(SLEEP_DURATION_SAFE); + } while (!stopwatch_expired(&sw)); + + printk(BIOS_INFO, + "%s: ValidSts bit %s(%d) in TPM_ACCESS register after %ld ms\n", + __func__, (buf & TPM_STS_VALID) ? "set" : "clear", + (buf & TPM_STS_VALID) >> 7, sw_run_duration); + + /* Claim failure if the ValidSts (bit 7) is clear */ + if (!(buf & TPM_STS_VALID)) + return -1; + + return 0; +} + +int tpm_vendor_init(struct tpm_chip *chip, unsigned bus, uint32_t dev_addr) +{ + struct tpm_inf_dev *tpm_dev = car_get_var_ptr(&g_tpm_dev); + uint32_t vendor; + + if (dev_addr == 0) { + printk(BIOS_ERR, "%s: missing device address\n", __func__); + return -1; + } + + tpm_dev->bus = bus; + tpm_dev->addr = dev_addr; + + cr50_vendor_init(chip); + + /* Disable interrupts (not supported) */ + chip->vendor.irq = 0; + + if (request_locality(chip, 0) != 0) + return -1; + + /* Read four bytes from DID_VID register */ + if (iic_tpm_read(TPM_DID_VID(0), (uint8_t *)&vendor, 4) < 0) + goto out_err; + + if (vendor != CR50_DID_VID) { + printk(BIOS_DEBUG, "Vendor ID 0x%08x not recognized\n", vendor); + goto out_err; + } + + printk(BIOS_DEBUG, "cr50 TPM %u:%02x (device-id 0x%X)\n", + tpm_dev->bus, tpm_dev->addr, vendor >> 16); + + chip->is_open = 1; + return 0; + +out_err: + release_locality(chip, 0, 1); + return -1; +} + +void tpm_vendor_cleanup(struct tpm_chip *chip) +{ + release_locality(chip, chip->vendor.locality, 1); +} diff --git a/src/drivers/i2c/tpm/tpm.c b/src/drivers/i2c/tpm/tpm.c index 6b96774f60..55c25fefa4 100644 --- a/src/drivers/i2c/tpm/tpm.c +++ b/src/drivers/i2c/tpm/tpm.c @@ -45,7 +45,6 @@ #define SLEEP_DURATION 60 /* in usec */ #define SLEEP_DURATION_LONG 210 /* in usec */ -#define SLEEP_DURATION_SAFE 750 /* in usec */ #define SLEEP_DURATION_PROBE_MS 1000 /* in msec */ /* max. number of iterations after I2C NAK for 'long' commands @@ -58,19 +57,16 @@ /* expected value for DIDVID register */ #define TPM_TIS_I2C_DID_VID_9635 0x000b15d1L #define TPM_TIS_I2C_DID_VID_9645 0x001a15d1L -#define TPM_TIS_I2C_DID_VID_CR50 0x00281ae0L enum i2c_chip_type { SLB9635, SLB9645, - CR50, UNKNOWN, }; static const char * const chip_name[] = { [SLB9635] = "slb9635tt", [SLB9645] = "slb9645tt", - [CR50] = "cr50", [UNKNOWN] = "unknown/fallback to slb9635", }; @@ -111,7 +107,6 @@ static int iic_tpm_read(uint8_t addr, uint8_t *buffer, size_t len) switch (tpm_dev->chip_type) { case SLB9635: - case CR50: case UNKNOWN: /* slb9635 protocol should work in both cases */ for (count = 0; count < MAX_COUNT; count++) { @@ -474,211 +469,6 @@ out_err: return -1; } -/* - * cr50 is a TPM 2.0 capable device that requries special - * handling for the I2C interface. - * - * - Timeouts need to be longer - * - Must use the older SLB9635 style write+wait+read read protocol - * - All 4 bytes of status register must be read at once - * - Burst count max is 63 bytes, and burst count behaves - * slightly differently than other I2C TPMs - * - When reading from FIFO the full burstcnt must be read - * instead of just reading header and determining the remainder - */ - -/* cr50 max burst count */ -#define CR50_MAX_BURSTCOUNT 63 - -/* cr50 requires all 4 bytes of status register to be read */ -static uint8_t cr50_tis_i2c_status(struct tpm_chip *chip) -{ - uint8_t buf[4]; - if (iic_tpm_read(TPM_STS(chip->vendor.locality), - buf, sizeof(buf)) < 0) { - printk(BIOS_ERR, "%s: Failed to read status\n", __func__); - return 0; - } - return buf[0]; -} - -/* cr50 requires all 4 bytes of status register to be written */ -static void cr50_tis_i2c_ready(struct tpm_chip *chip) -{ - uint8_t buf[4] = { TPM_STS_COMMAND_READY }; - iic_tpm_write_long(TPM_STS(chip->vendor.locality), buf, sizeof(buf)); -} - -/* cr50 uses bytes 3:2 of status register for burst count and - * all 4 bytes must be read */ -static int cr50_wait_burst_status(struct tpm_chip *chip, uint8_t mask, - size_t *burst, int *status) -{ - uint8_t buf[4]; - struct stopwatch sw; - - stopwatch_init_msecs_expire(&sw, 2000); - - while (!stopwatch_expired(&sw)) { - if (iic_tpm_read(TPM_STS(chip->vendor.locality), - buf, sizeof(buf)) != 0) { - printk(BIOS_WARNING, "%s: Read failed\n", __func__); - udelay(SLEEP_DURATION_SAFE); - continue; - } - - *status = buf[0]; - *burst = read_le16(&buf[1]); - - /* Check if mask matches and burst is valid */ - if ((*status & mask) == mask && - *burst > 0 && *burst <= CR50_MAX_BURSTCOUNT) - return 0; - - udelay(SLEEP_DURATION_SAFE); - } - - printk(BIOS_ERR, "%s: Timeout reading burst and status\n", __func__); - return -1; -} - -static int cr50_tis_i2c_recv(struct tpm_chip *chip, uint8_t *buf, - size_t buf_len) -{ - size_t burstcnt, current, len, expected; - uint8_t addr = TPM_DATA_FIFO(chip->vendor.locality); - int status; - int ret = -1; - - if (buf_len < TPM_HEADER_SIZE) - goto out; - - if (cr50_wait_burst_status(chip, TPM_STS_VALID, &burstcnt, &status) < 0) - goto out; - if (!(status & TPM_STS_DATA_AVAIL)) { - printk(BIOS_ERR, "%s: First chunk not available\n", __func__); - goto out; - } - - /* Read first chunk of burstcnt bytes */ - if (iic_tpm_read(addr, buf, burstcnt) != 0) { - printk(BIOS_ERR, "%s: Read failed\n", __func__); - goto out; - } - - /* Determine expected data in the return buffer */ - expected = read_be32(buf + TPM_RSP_SIZE_BYTE); - if (expected > buf_len) { - printk(BIOS_ERR, "%s: Too much data: %zu > %zu\n", - __func__, expected, buf_len); - goto out; - } - - /* Now read the rest of the data */ - current = burstcnt; - while (current < expected) { - /* Read updated burst count and check status */ - if (cr50_wait_burst_status(chip, TPM_STS_VALID, - &burstcnt, &status) < 0) - goto out; - if (!(status & TPM_STS_DATA_AVAIL)) { - printk(BIOS_ERR, "%s: Data not available\n", __func__); - goto out; - } - - len = min(burstcnt, expected - current); - if (iic_tpm_read(addr, buf + current, len) != 0) { - printk(BIOS_ERR, "%s: Read failed\n", __func__); - goto out; - } - - current += len; - } - - /* Ensure TPM is done reading data */ - if (cr50_wait_burst_status(chip, TPM_STS_VALID, &burstcnt, &status) < 0) - goto out; - if (status & TPM_STS_DATA_AVAIL) { - printk(BIOS_ERR, "%s: Data still available\n", __func__); - goto out; - } - - ret = current; - -out: - return ret; -} - -static int cr50_tis_i2c_send(struct tpm_chip *chip, uint8_t *buf, size_t len) -{ - int status; - size_t burstcnt, limit, sent = 0; - uint8_t tpm_go[4] = { TPM_STS_GO }; - struct stopwatch sw; - - if (len > TPM_BUFSIZE) - return -1; - - stopwatch_init_msecs_expire(&sw, 2000); - - /* Wait until TPM is ready for a command */ - while (!(cr50_tis_i2c_status(chip) & TPM_STS_COMMAND_READY)) { - if (stopwatch_expired(&sw)) { - printk(BIOS_ERR, "%s: Command ready timeout\n", - __func__); - return -1; - } - - cr50_tis_i2c_ready(chip); - udelay(SLEEP_DURATION_SAFE); - } - - while (len > 0) { - /* Read burst count and check status */ - if (cr50_wait_burst_status(chip, TPM_STS_VALID, - &burstcnt, &status) < 0) - goto out; - if (sent > 0 && !(status & TPM_STS_DATA_EXPECT)) { - printk(BIOS_ERR, "%s: Data not expected\n", __func__); - goto out; - } - - /* Use burstcnt - 1 to account for the address byte - * that is inserted by iic_tpm_write() */ - limit = min(burstcnt - 1, len); - if (iic_tpm_write(TPM_DATA_FIFO(chip->vendor.locality), - &buf[sent], limit) != 0) { - printk(BIOS_ERR, "%s: Write failed\n", __func__); - goto out; - } - - sent += limit; - len -= limit; - } - - /* Ensure TPM is not expecting more data */ - if (cr50_wait_burst_status(chip, TPM_STS_VALID, &burstcnt, &status) < 0) - goto out; - if (status & TPM_STS_DATA_EXPECT) { - printk(BIOS_ERR, "%s: Data still expected\n", __func__); - goto out; - } - - /* Start the TPM command */ - if (iic_tpm_write(TPM_STS(chip->vendor.locality), tpm_go, - sizeof(tpm_go)) < 0) { - printk(BIOS_ERR, "%s: Start command failed\n", __func__); - goto out; - } - return sent; - -out: - /* Abort current transaction if still pending */ - if (cr50_tis_i2c_status(chip) & TPM_STS_COMMAND_READY) - cr50_tis_i2c_ready(chip); - return -1; -} - /* Initialization of I2C TPM */ int tpm_vendor_probe(unsigned bus, uint32_t addr) @@ -692,8 +482,8 @@ int tpm_vendor_probe(unsigned bus, uint32_t addr) tpm_dev->chip_type = UNKNOWN; tpm_dev->bus = bus; tpm_dev->addr = addr; - tpm_dev->sleep_short = SLEEP_DURATION_SAFE; - tpm_dev->sleep_long = SLEEP_DURATION_SAFE * 2; + tpm_dev->sleep_short = SLEEP_DURATION; + tpm_dev->sleep_long = SLEEP_DURATION_LONG; /* * Probe TPM. Check if the TPM_ACCESS register's ValidSts bit is set(1) @@ -706,7 +496,7 @@ int tpm_vendor_probe(unsigned bus, uint32_t addr) sw_run_duration = stopwatch_duration_msecs(&sw); break; } - udelay(SLEEP_DURATION_SAFE); + udelay(SLEEP_DURATION); } while (!stopwatch_expired(&sw)); printk(BIOS_INFO, @@ -736,10 +526,8 @@ int tpm_vendor_init(struct tpm_chip *chip, unsigned bus, uint32_t dev_addr) tpm_dev->chip_type = UNKNOWN; tpm_dev->bus = bus; tpm_dev->addr = dev_addr; - - /* Use conservative values to read chip id */ - tpm_dev->sleep_short = SLEEP_DURATION_SAFE; - tpm_dev->sleep_long = SLEEP_DURATION_SAFE * 2; + tpm_dev->sleep_short = SLEEP_DURATION; + tpm_dev->sleep_long = SLEEP_DURATION_LONG; memset(&chip->vendor, 0, sizeof(struct tpm_vendor_specific)); chip->is_open = 1; @@ -747,6 +535,10 @@ int tpm_vendor_init(struct tpm_chip *chip, unsigned bus, uint32_t dev_addr) chip->vendor.req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID; chip->vendor.req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID; chip->vendor.req_canceled = TPM_STS_COMMAND_READY; + chip->vendor.status = &tpm_tis_i2c_status; + chip->vendor.recv = &tpm_tis_i2c_recv; + chip->vendor.send = &tpm_tis_i2c_send; + chip->vendor.cancel = &tpm_tis_i2c_ready; /* Disable interrupts (not supported) */ chip->vendor.irq = 0; @@ -762,27 +554,11 @@ int tpm_vendor_init(struct tpm_chip *chip, unsigned bus, uint32_t dev_addr) tpm_dev->chip_type = SLB9645; } else if (be32_to_cpu(vendor) == TPM_TIS_I2C_DID_VID_9635) { tpm_dev->chip_type = SLB9635; - } else if (vendor == TPM_TIS_I2C_DID_VID_CR50) { - tpm_dev->chip_type = CR50; } else { printk(BIOS_DEBUG, "Vendor ID 0x%08x not recognized.\n", vendor); goto out_err; } - if (tpm_dev->chip_type == CR50) { - chip->vendor.status = &cr50_tis_i2c_status; - chip->vendor.recv = &cr50_tis_i2c_recv; - chip->vendor.send = &cr50_tis_i2c_send; - chip->vendor.cancel = &cr50_tis_i2c_ready; - } else { - tpm_dev->sleep_short = SLEEP_DURATION; - tpm_dev->sleep_long = SLEEP_DURATION_LONG; - chip->vendor.status = &tpm_tis_i2c_status; - chip->vendor.recv = &tpm_tis_i2c_recv; - chip->vendor.send = &tpm_tis_i2c_send; - chip->vendor.cancel = &tpm_tis_i2c_ready; - } - printk(BIOS_DEBUG, "I2C TPM %u:%02x (chip type %s device-id 0x%X)\n", tpm_dev->bus, tpm_dev->addr, chip_name[tpm_dev->chip_type], vendor >> 16); |