CONFIG_TPM
Support TPM devices.
- CONFIG_TPM_TIS_I2C
- Support for i2c bus TPM devices. Only one device
+ CONFIG_TPM_TIS_INFINEON
+ Support for Infineon i2c bus TPM devices. Only one device
per system is supported at this time.
CONFIG_TPM_TIS_I2C_BURST_LIMITATION
CONFIG_SPI_FLASH=y
CONFIG_TEGRA114_SPI=y
CONFIG_DM_TPM=y
-CONFIG_TPM_TIS_I2C=y
+CONFIG_TPM_TIS_INFINEON=y
CONFIG_USB=y
CONFIG_DM_USB=y
CONFIG_DISPLAY_PORT=y
CONFIG_SOUND_MAX98095=y
CONFIG_SOUND_WM8994=y
CONFIG_DM_TPM=y
-CONFIG_TPM_TIS_I2C=y
+CONFIG_TPM_TIS_INFINEON=y
CONFIG_USB=y
CONFIG_DM_USB=y
CONFIG_VIDEO_BRIDGE=y
CONFIG_SOUND_MAX98095=y
CONFIG_SOUND_WM8994=y
CONFIG_DM_TPM=y
-CONFIG_TPM_TIS_I2C=y
+CONFIG_TPM_TIS_INFINEON=y
CONFIG_USB=y
CONFIG_DM_USB=y
CONFIG_VIDEO_BRIDGE=y
CONFIG_SOUND_MAX98095=y
CONFIG_SOUND_WM8994=y
CONFIG_DM_TPM=y
-CONFIG_TPM_TIS_I2C=y
+CONFIG_TPM_TIS_INFINEON=y
CONFIG_USB=y
CONFIG_DM_USB=y
CONFIG_VIDEO_BRIDGE=y
CONFIG_SOUND_MAX98095=y
CONFIG_SOUND_WM8994=y
CONFIG_DM_TPM=y
-CONFIG_TPM_TIS_I2C=y
+CONFIG_TPM_TIS_INFINEON=y
CONFIG_USB=y
CONFIG_DM_USB=y
CONFIG_VIDEO_BRIDGE=y
to the device using the standard TPM Interface Specification (TIS)
protocol
-config TPM_TIS_I2C
+config TPM_TIS_INFINEON
bool "Enable support for Infineon SLB9635/45 TPMs on I2C"
depends on TPM && DM_I2C
help
config TPM_TIS_I2C_BURST_LIMITATION
bool "Enable I2C burst length limitation"
- depends on TPM_TIS_I2C
+ depends on TPM_TIS_INFINEON
help
Some broken TPMs have a limitation on the number of bytes they can
receive in one message. Enable this option to allow you to set this
obj-$(CONFIG_DM_TPM) += tpm-uclass.o
obj-$(CONFIG_TPM_ATMEL_TWI) += tpm_atmel_twi.o
-obj-$(CONFIG_TPM_TIS_I2C) += tpm_tis_i2c.o
+obj-$(CONFIG_TPM_TIS_INFINEON) += tpm_tis_infineon.o
obj-$(CONFIG_TPM_TIS_LPC) += tpm_tis_lpc.o
obj-$(CONFIG_TPM_TIS_SANDBOX) += tpm_tis_sandbox.o
+++ /dev/null
-/*
- * Copyright (C) 2011 Infineon Technologies
- *
- * Authors:
- * Peter Huewe <huewe.external@infineon.com>
- *
- * Description:
- * Device driver for TCG/TCPA TPM (trusted platform module).
- * Specifications at www.trustedcomputinggroup.org
- *
- * This device driver implements the TPM interface as defined in
- * the TCG TPM Interface Spec version 1.2, revision 1.0 and the
- * Infineon I2C Protocol Stack Specification v0.20.
- *
- * It is based on the Linux kernel driver tpm.c from Leendert van
- * Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall.
- *
- * Version: 2.1.1
- *
- * SPDX-License-Identifier: GPL-2.0
- */
-
-#include <common.h>
-#include <dm.h>
-#include <fdtdec.h>
-#include <i2c.h>
-#include <tis.h>
-#include <tpm.h>
-#include <asm-generic/errno.h>
-#include <linux/compiler.h>
-#include <linux/types.h>
-#include <linux/unaligned/be_byteshift.h>
-
-#include "tpm_tis_i2c.h"
-#include "tpm_internal.h"
-
-DECLARE_GLOBAL_DATA_PTR;
-
-static const char * const chip_name[] = {
- [SLB9635] = "slb9635tt",
- [SLB9645] = "slb9645tt",
- [UNKNOWN] = "unknown/fallback to slb9635",
-};
-
-/*
- * tpm_tis_i2c_read() - read from TPM register
- * @addr: register address to read from
- * @buffer: provided by caller
- * @len: number of bytes to read
- *
- * Read len bytes from TPM register and put them into
- * buffer (little-endian format, i.e. first byte is put into buffer[0]).
- *
- * NOTE: TPM is big-endian for multi-byte values. Multi-byte
- * values have to be swapped.
- *
- * Return -EIO on error, 0 on success.
- */
-static int tpm_tis_i2c_read(struct udevice *dev, u8 addr, u8 *buffer,
- size_t len)
-{
- struct tpm_chip *chip = dev_get_priv(dev);
- int rc;
- int count;
- uint32_t addrbuf = addr;
-
- if ((chip->chip_type == SLB9635) || (chip->chip_type == UNKNOWN)) {
- /* slb9635 protocol should work in both cases */
- for (count = 0; count < MAX_COUNT; count++) {
- rc = dm_i2c_write(dev, 0, (uchar *)&addrbuf, 1);
- if (rc == 0)
- break; /* Success, break to skip sleep */
- udelay(SLEEP_DURATION_US);
- }
- if (rc)
- return rc;
-
- /* After the TPM has successfully received the register address
- * it needs some time, thus we're sleeping here again, before
- * retrieving the data
- */
- for (count = 0; count < MAX_COUNT; count++) {
- udelay(SLEEP_DURATION_US);
- rc = dm_i2c_read(dev, 0, buffer, len);
- if (rc == 0)
- break; /* success, break to skip sleep */
- }
- } else {
- /*
- * Use a combined read for newer chips.
- * Unfortunately the smbus functions are not suitable due to
- * the 32 byte limit of the smbus.
- * Retries should usually not be needed, but are kept just to
- * be safe on the safe side.
- */
- for (count = 0; count < MAX_COUNT; count++) {
- rc = dm_i2c_read(dev, addr, buffer, len);
- if (rc == 0)
- break; /* break here to skip sleep */
- udelay(SLEEP_DURATION_US);
- }
- }
-
- /* Take care of 'guard time' */
- udelay(SLEEP_DURATION_US);
- if (rc)
- return rc;
-
- return 0;
-}
-
-static int tpm_tis_i2c_write_generic(struct udevice *dev, u8 addr,
- const u8 *buffer, size_t len,
- unsigned int sleep_time_us, u8 max_count)
-{
- struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
- struct tpm_chip *chip = dev_get_priv(dev);
- int rc = 0;
- int count;
-
- if (chip->chip_type == SLB9635) {
- /* Prepare send buffer to include the address */
- priv->buf[0] = addr;
- memcpy(&(priv->buf[1]), buffer, len);
- buffer = priv->buf;
- len++;
- addr = 0;
- }
-
- for (count = 0; count < max_count; count++) {
- rc = dm_i2c_write(dev, addr, buffer, len);
- if (rc == 0)
- break; /* Success, break to skip sleep */
- udelay(sleep_time_us);
- }
-
- /* take care of 'guard time' */
- udelay(sleep_time_us);
- if (rc)
- return rc;
-
- return 0;
-}
-
-/*
- * tpm_tis_i2c_write() - write to TPM register
- * @addr: register address to write to
- * @buffer: containing data to be written
- * @len: number of bytes to write
- *
- * Write len bytes from provided buffer to TPM register (little
- * endian format, i.e. buffer[0] is written as first byte).
- *
- * NOTE: TPM is big-endian for multi-byte values. Multi-byte
- * values have to be swapped.
- *
- * NOTE: use this function instead of the tpm_tis_i2c_write_generic function.
- *
- * Return -EIO on error, 0 on success
- */
-static int tpm_tis_i2c_write(struct udevice *dev, u8 addr, const u8 *buffer,
- size_t len)
-{
- return tpm_tis_i2c_write_generic(dev, addr, buffer, len,
- SLEEP_DURATION_US, MAX_COUNT);
-}
-
-/*
- * This function is needed especially for the cleanup situation after
- * sending TPM_READY
- */
-static int tpm_tis_i2c_write_long(struct udevice *dev, u8 addr, u8 *buffer,
- size_t len)
-{
- return tpm_tis_i2c_write_generic(dev, addr, buffer, len,
- SLEEP_DURATION_LONG_US,
- MAX_COUNT_LONG);
-}
-
-static int tpm_tis_i2c_check_locality(struct udevice *dev, int loc)
-{
- const u8 mask = TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID;
- struct tpm_chip *chip = dev_get_priv(dev);
- u8 buf;
- int rc;
-
- rc = tpm_tis_i2c_read(dev, TPM_ACCESS(loc), &buf, 1);
- if (rc < 0)
- return rc;
-
- if ((buf & mask) == mask) {
- chip->locality = loc;
- return loc;
- }
-
- return -ENOENT;
-}
-
-static void tpm_tis_i2c_release_locality(struct udevice *dev, int loc,
- int force)
-{
- const u8 mask = TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID;
- u8 buf;
-
- if (tpm_tis_i2c_read(dev, TPM_ACCESS(loc), &buf, 1) < 0)
- return;
-
- if (force || (buf & mask) == mask) {
- buf = TPM_ACCESS_ACTIVE_LOCALITY;
- tpm_tis_i2c_write(dev, TPM_ACCESS(loc), &buf, 1);
- }
-}
-
-static int tpm_tis_i2c_request_locality(struct udevice *dev, int loc)
-{
- struct tpm_chip *chip = dev_get_priv(dev);
- unsigned long start, stop;
- u8 buf = TPM_ACCESS_REQUEST_USE;
- int rc;
-
- rc = tpm_tis_i2c_check_locality(dev, loc);
- if (rc >= 0) {
- debug("%s: Already have locality\n", __func__);
- return loc; /* We already have the locality */
- } else if (rc != -ENOENT) {
- debug("%s: Failed to get locality: %d\n", __func__, rc);
- return rc;
- }
-
- rc = tpm_tis_i2c_write(dev, TPM_ACCESS(loc), &buf, 1);
- if (rc) {
- debug("%s: Failed to write to TPM: %d\n", __func__, rc);
- return rc;
- }
-
- /* Wait for burstcount */
- start = get_timer(0);
- stop = chip->timeout_a;
- do {
- rc = tpm_tis_i2c_check_locality(dev, loc);
- if (rc >= 0) {
- debug("%s: Have locality\n", __func__);
- return loc;
- } else if (rc != -ENOENT) {
- debug("%s: Failed to get locality: %d\n", __func__, rc);
- return rc;
- }
- mdelay(TPM_TIMEOUT_MS);
- } while (get_timer(start) < stop);
- debug("%s: Timeout getting locality: %d\n", __func__, rc);
-
- return rc;
-}
-
-static u8 tpm_tis_i2c_status(struct udevice *dev)
-{
- struct tpm_chip *chip = dev_get_priv(dev);
- /* NOTE: Since i2c read may fail, return 0 in this case --> time-out */
- u8 buf;
-
- if (tpm_tis_i2c_read(dev, TPM_STS(chip->locality), &buf, 1) < 0)
- return 0;
- else
- return buf;
-}
-
-static int tpm_tis_i2c_ready(struct udevice *dev)
-{
- struct tpm_chip *chip = dev_get_priv(dev);
- int rc;
-
- /* This causes the current command to be aborted */
- u8 buf = TPM_STS_COMMAND_READY;
-
- debug("%s\n", __func__);
- rc = tpm_tis_i2c_write_long(dev, TPM_STS(chip->locality), &buf, 1);
- if (rc)
- debug("%s: rc=%d\n", __func__, rc);
-
- return rc;
-}
-
-static ssize_t tpm_tis_i2c_get_burstcount(struct udevice *dev)
-{
- struct tpm_chip *chip = dev_get_priv(dev);
- unsigned long start, stop;
- ssize_t burstcnt;
- u8 addr, buf[3];
-
- /* Wait for burstcount */
- /* XXX: Which timeout value? Spec has 2 answers (c & d) */
- start = get_timer(0);
- stop = chip->timeout_d;
- do {
- /* Note: STS is little endian */
- addr = TPM_STS(chip->locality) + 1;
- if (tpm_tis_i2c_read(dev, addr, buf, 3) < 0)
- burstcnt = 0;
- else
- burstcnt = (buf[2] << 16) + (buf[1] << 8) + buf[0];
-
- if (burstcnt)
- return burstcnt;
- mdelay(TPM_TIMEOUT_MS);
- } while (get_timer(start) < stop);
-
- return -EBUSY;
-}
-
-static int tpm_tis_i2c_wait_for_stat(struct udevice *dev, u8 mask,
- unsigned long timeout, int *status)
-{
- unsigned long start, stop;
-
- /* Check current status */
- *status = tpm_tis_i2c_status(dev);
- if ((*status & mask) == mask)
- return 0;
-
- start = get_timer(0);
- stop = timeout;
- do {
- mdelay(TPM_TIMEOUT_MS);
- *status = tpm_tis_i2c_status(dev);
- if ((*status & mask) == mask)
- return 0;
- } while (get_timer(start) < stop);
-
- return -ETIMEDOUT;
-}
-
-static int tpm_tis_i2c_recv_data(struct udevice *dev, u8 *buf, size_t count)
-{
- struct tpm_chip *chip = dev_get_priv(dev);
- size_t size = 0;
- ssize_t burstcnt;
- int rc;
-
- while (size < count) {
- burstcnt = tpm_tis_i2c_get_burstcount(dev);
-
- /* burstcount < 0 -> tpm is busy */
- if (burstcnt < 0)
- return burstcnt;
-
- /* Limit received data to max left */
- if (burstcnt > (count - size))
- burstcnt = count - size;
-
- rc = tpm_tis_i2c_read(dev, TPM_DATA_FIFO(chip->locality),
- &(buf[size]), burstcnt);
- if (rc == 0)
- size += burstcnt;
- }
-
- return size;
-}
-
-static int tpm_tis_i2c_recv(struct udevice *dev, u8 *buf, size_t count)
-{
- struct tpm_chip *chip = dev_get_priv(dev);
- int size = 0;
- int expected, status;
- int rc;
-
- status = tpm_tis_i2c_status(dev);
- if (status == TPM_STS_COMMAND_READY)
- return -EINTR;
- if ((status & (TPM_STS_DATA_AVAIL | TPM_STS_VALID)) !=
- (TPM_STS_DATA_AVAIL | TPM_STS_VALID))
- return -EAGAIN;
-
- debug("...got it;\n");
-
- /* Read first 10 bytes, including tag, paramsize, and result */
- size = tpm_tis_i2c_recv_data(dev, buf, TPM_HEADER_SIZE);
- if (size < TPM_HEADER_SIZE) {
- debug("Unable to read header\n");
- return size < 0 ? size : -EIO;
- }
-
- expected = get_unaligned_be32(buf + TPM_RSP_SIZE_BYTE);
- if ((size_t)expected > count) {
- debug("Error size=%x, expected=%x, count=%x\n", size, expected,
- count);
- return -ENOSPC;
- }
-
- size += tpm_tis_i2c_recv_data(dev, &buf[TPM_HEADER_SIZE],
- expected - TPM_HEADER_SIZE);
- if (size < expected) {
- debug("Unable to read remainder of result\n");
- return -ETIMEDOUT;
- }
-
- rc = tpm_tis_i2c_wait_for_stat(dev, TPM_STS_VALID, chip->timeout_c,
- &status);
- if (rc)
- return rc;
- if (status & TPM_STS_DATA_AVAIL) { /* Retry? */
- debug("Error left over data\n");
- return -EIO;
- }
-
- return size;
-}
-
-static int tpm_tis_i2c_send(struct udevice *dev, const u8 *buf, size_t len)
-{
- struct tpm_chip *chip = dev_get_priv(dev);
- int rc, status;
- size_t burstcnt;
- size_t count = 0;
- int retry = 0;
- u8 sts = TPM_STS_GO;
-
- debug("%s: len=%d\n", __func__, len);
- if (len > TPM_DEV_BUFSIZE)
- return -E2BIG; /* Command is too long for our tpm, sorry */
-
- if (tpm_tis_i2c_request_locality(dev, 0) < 0)
- return -EBUSY;
-
- status = tpm_tis_i2c_status(dev);
- if ((status & TPM_STS_COMMAND_READY) == 0) {
- rc = tpm_tis_i2c_ready(dev);
- if (rc)
- return rc;
- rc = tpm_tis_i2c_wait_for_stat(dev, TPM_STS_COMMAND_READY,
- chip->timeout_b, &status);
- if (rc)
- return rc;
- }
-
- burstcnt = tpm_tis_i2c_get_burstcount(dev);
-
- /* burstcount < 0 -> tpm is busy */
- if (burstcnt < 0)
- return burstcnt;
-
- while (count < len) {
- udelay(300);
- if (burstcnt > len - count)
- burstcnt = len - count;
-
-#ifdef CONFIG_TPM_TIS_I2C_BURST_LIMITATION
- if (retry && burstcnt > CONFIG_TPM_TIS_I2C_BURST_LIMITATION_LEN)
- burstcnt = CONFIG_TPM_TIS_I2C_BURST_LIMITATION_LEN;
-#endif /* CONFIG_TPM_TIS_I2C_BURST_LIMITATION */
-
- rc = tpm_tis_i2c_write(dev, TPM_DATA_FIFO(chip->locality),
- &(buf[count]), burstcnt);
- if (rc == 0)
- count += burstcnt;
- else {
- debug("%s: error\n", __func__);
- if (retry++ > 10)
- return -EIO;
- rc = tpm_tis_i2c_wait_for_stat(dev, TPM_STS_VALID,
- chip->timeout_c,
- &status);
- if (rc)
- return rc;
-
- if ((status & TPM_STS_DATA_EXPECT) == 0)
- return -EIO;
- }
- }
-
- /* Go and do it */
- rc = tpm_tis_i2c_write(dev, TPM_STS(chip->locality), &sts, 1);
- if (rc < 0)
- return rc;
- debug("%s: done, rc=%d\n", __func__, rc);
-
- return len;
-}
-
-static int tpm_tis_i2c_cleanup(struct udevice *dev)
-{
- struct tpm_chip *chip = dev_get_priv(dev);
-
- tpm_tis_i2c_ready(dev);
- /*
- * The TPM needs some time to clean up here,
- * so we sleep rather than keeping the bus busy
- */
- mdelay(2);
- tpm_tis_i2c_release_locality(dev, chip->locality, 0);
-
- return 0;
-}
-
-static int tpm_tis_i2c_init(struct udevice *dev)
-{
- struct tpm_chip *chip = dev_get_priv(dev);
- u32 vendor;
- u32 expected_did_vid;
- int rc;
-
- 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;
-
- rc = tpm_tis_i2c_request_locality(dev, 0);
- if (rc < 0)
- return rc;
-
- /* Read four bytes from DID_VID register */
- if (tpm_tis_i2c_read(dev, TPM_DID_VID(0), (uchar *)&vendor, 4) < 0) {
- tpm_tis_i2c_release_locality(dev, 0, 1);
- return -EIO;
- }
-
- if (chip->chip_type == SLB9635) {
- vendor = be32_to_cpu(vendor);
- expected_did_vid = TPM_TIS_I2C_DID_VID_9635;
- } else {
- /* device id and byte order has changed for newer i2c tpms */
- expected_did_vid = TPM_TIS_I2C_DID_VID_9645;
- }
-
- if (chip->chip_type != UNKNOWN && vendor != expected_did_vid) {
- error("Vendor id did not match! ID was %08x\n", vendor);
- return -ENODEV;
- }
-
- chip->vend_dev = vendor;
- debug("1.2 TPM (chip type %s device-id 0x%X)\n",
- chip_name[chip->chip_type], vendor >> 16);
-
- /*
- * A timeout query to TPM can be placed here.
- * Standard timeout values are used so far
- */
-
- return 0;
-}
-
-static int tpm_tis_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 = tpm_tis_i2c_init(dev);
- if (rc < 0)
- chip->is_open = 0;
-
- return rc;
-}
-
-static int tpm_tis_i2c_close(struct udevice *dev)
-{
- struct tpm_chip *chip = dev_get_priv(dev);
-
- if (chip->is_open) {
- tpm_tis_i2c_release_locality(dev, chip->locality, 1);
- chip->is_open = 0;
- chip->vend_dev = 0;
- }
-
- return 0;
-}
-
-static int tpm_tis_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",
- chip_name[chip->chip_type],
- chip->vend_dev >> 16);
-}
-
-static int tpm_tis_i2c_probe(struct udevice *dev)
-{
- struct tpm_chip_priv *uc_priv = dev_get_uclass_priv(dev);
- struct tpm_chip *chip = dev_get_priv(dev);
-
- chip->chip_type = dev_get_driver_data(dev);
-
- /* TODO: These need to be checked and tuned */
- uc_priv->duration_ms[TPM_SHORT] = TIS_SHORT_TIMEOUT_MS;
- uc_priv->duration_ms[TPM_MEDIUM] = TIS_LONG_TIMEOUT_MS;
- uc_priv->duration_ms[TPM_LONG] = TIS_LONG_TIMEOUT_MS;
- uc_priv->retry_time_ms = TPM_TIMEOUT_MS;
-
- return 0;
-}
-
-static const struct tpm_ops tpm_tis_i2c_ops = {
- .open = tpm_tis_i2c_open,
- .close = tpm_tis_i2c_close,
- .get_desc = tpm_tis_get_desc,
- .send = tpm_tis_i2c_send,
- .recv = tpm_tis_i2c_recv,
- .cleanup = tpm_tis_i2c_cleanup,
-};
-
-static const struct udevice_id tpm_tis_i2c_ids[] = {
- { .compatible = "infineon,slb9635tt", .data = SLB9635 },
- { .compatible = "infineon,slb9645tt", .data = SLB9645 },
- { }
-};
-
-U_BOOT_DRIVER(tpm_tis_i2c) = {
- .name = "tpm_tis_i2c",
- .id = UCLASS_TPM,
- .of_match = tpm_tis_i2c_ids,
- .ops = &tpm_tis_i2c_ops,
- .probe = tpm_tis_i2c_probe,
- .priv_auto_alloc_size = sizeof(struct tpm_chip),
-};
+++ /dev/null
-/*
- * Copyright (C) 2011 Infineon Technologies
- *
- * Authors:
- * Peter Huewe <huewe.external@infineon.com>
- *
- * Version: 2.1.1
- *
- * Description:
- * Device driver for TCG/TCPA TPM (trusted platform module).
- * Specifications at www.trustedcomputinggroup.org
- *
- * It is based on the Linux kernel driver tpm.c from Leendert van
- * Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall.
- *
- * SPDX-License-Identifier: GPL-2.0
- */
-
-#ifndef _TPM_TIS_I2C_H
-#define _TPM_TIS_I2C_H
-
-#include <linux/compiler.h>
-#include <linux/types.h>
-
-enum tpm_timeout {
- TPM_TIMEOUT_MS = 5,
- TIS_SHORT_TIMEOUT_MS = 750,
- TIS_LONG_TIMEOUT_MS = 2000,
- SLEEP_DURATION_US = 60,
- SLEEP_DURATION_LONG_US = 210,
-};
-
-/* Size of external transmit buffer (used in tpm_transmit)*/
-#define TPM_BUFSIZE 4096
-
-/* Index of Count field in TPM response buffer */
-#define TPM_RSP_SIZE_BYTE 2
-#define TPM_RSP_RC_BYTE 6
-
-enum i2c_chip_type {
- SLB9635,
- SLB9645,
- UNKNOWN,
-};
-
-struct tpm_chip {
- int is_open;
- int locality;
- u32 vend_dev;
- unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* msec */
- enum i2c_chip_type chip_type;
-};
-
-struct tpm_input_header {
- __be16 tag;
- __be32 length;
- __be32 ordinal;
-} __packed;
-
-struct tpm_output_header {
- __be16 tag;
- __be32 length;
- __be32 return_code;
-} __packed;
-
-struct timeout_t {
- __be32 a;
- __be32 b;
- __be32 c;
- __be32 d;
-} __packed;
-
-struct duration_t {
- __be32 tpm_short;
- __be32 tpm_medium;
- __be32 tpm_long;
-} __packed;
-
-union cap_t {
- struct timeout_t timeout;
- struct duration_t duration;
-};
-
-struct tpm_getcap_params_in {
- __be32 cap;
- __be32 subcap_size;
- __be32 subcap;
-} __packed;
-
-struct tpm_getcap_params_out {
- __be32 cap_size;
- union cap_t cap;
-} __packed;
-
-union tpm_cmd_header {
- struct tpm_input_header in;
- struct tpm_output_header out;
-};
-
-union tpm_cmd_params {
- struct tpm_getcap_params_out getcap_out;
- struct tpm_getcap_params_in getcap_in;
-};
-
-struct tpm_cmd_t {
- union tpm_cmd_header header;
- union tpm_cmd_params params;
-} __packed;
-
-/* Max number of iterations after i2c NAK */
-#define MAX_COUNT 3
-
-/*
- * Max number of iterations after i2c NAK for 'long' commands
- *
- * We need this especially for sending TPM_READY, since the cleanup after the
- * transtion to the ready state may take some time, but it is unpredictable
- * how long it will take.
- */
-#define MAX_COUNT_LONG 50
-
-enum tis_access {
- TPM_ACCESS_VALID = 0x80,
- TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
- TPM_ACCESS_REQUEST_PENDING = 0x04,
- TPM_ACCESS_REQUEST_USE = 0x02,
-};
-
-enum tis_status {
- TPM_STS_VALID = 0x80,
- TPM_STS_COMMAND_READY = 0x40,
- TPM_STS_GO = 0x20,
- TPM_STS_DATA_AVAIL = 0x10,
- TPM_STS_DATA_EXPECT = 0x08,
-};
-
-/* expected value for DIDVID register */
-#define TPM_TIS_I2C_DID_VID_9635 0x000b15d1L
-#define TPM_TIS_I2C_DID_VID_9645 0x001a15d1L
-
-#define TPM_ACCESS(l) (0x0000 | ((l) << 4))
-#define TPM_STS(l) (0x0001 | ((l) << 4))
-#define TPM_DATA_FIFO(l) (0x0005 | ((l) << 4))
-#define TPM_DID_VID(l) (0x0006 | ((l) << 4))
-
-#endif
--- /dev/null
+/*
+ * Copyright (C) 2011 Infineon Technologies
+ *
+ * Authors:
+ * Peter Huewe <huewe.external@infineon.com>
+ *
+ * Description:
+ * Device driver for TCG/TCPA TPM (trusted platform module).
+ * Specifications at www.trustedcomputinggroup.org
+ *
+ * This device driver implements the TPM interface as defined in
+ * the TCG TPM Interface Spec version 1.2, revision 1.0 and the
+ * Infineon I2C Protocol Stack Specification v0.20.
+ *
+ * It is based on the Linux kernel driver tpm.c from Leendert van
+ * Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall.
+ *
+ * Version: 2.1.1
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <i2c.h>
+#include <tis.h>
+#include <tpm.h>
+#include <asm-generic/errno.h>
+#include <linux/compiler.h>
+#include <linux/types.h>
+#include <linux/unaligned/be_byteshift.h>
+
+#include "tpm_tis_infineon.h"
+#include "tpm_internal.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const char * const chip_name[] = {
+ [SLB9635] = "slb9635tt",
+ [SLB9645] = "slb9645tt",
+ [UNKNOWN] = "unknown/fallback to slb9635",
+};
+
+/*
+ * tpm_tis_i2c_read() - read from TPM register
+ * @addr: register address to read from
+ * @buffer: provided by caller
+ * @len: number of bytes to read
+ *
+ * Read len bytes from TPM register and put them into
+ * buffer (little-endian format, i.e. first byte is put into buffer[0]).
+ *
+ * NOTE: TPM is big-endian for multi-byte values. Multi-byte
+ * values have to be swapped.
+ *
+ * Return -EIO on error, 0 on success.
+ */
+static int tpm_tis_i2c_read(struct udevice *dev, u8 addr, u8 *buffer,
+ size_t len)
+{
+ struct tpm_chip *chip = dev_get_priv(dev);
+ int rc;
+ int count;
+ uint32_t addrbuf = addr;
+
+ if ((chip->chip_type == SLB9635) || (chip->chip_type == UNKNOWN)) {
+ /* slb9635 protocol should work in both cases */
+ for (count = 0; count < MAX_COUNT; count++) {
+ rc = dm_i2c_write(dev, 0, (uchar *)&addrbuf, 1);
+ if (rc == 0)
+ break; /* Success, break to skip sleep */
+ udelay(SLEEP_DURATION_US);
+ }
+ if (rc)
+ return rc;
+
+ /* After the TPM has successfully received the register address
+ * it needs some time, thus we're sleeping here again, before
+ * retrieving the data
+ */
+ for (count = 0; count < MAX_COUNT; count++) {
+ udelay(SLEEP_DURATION_US);
+ rc = dm_i2c_read(dev, 0, buffer, len);
+ if (rc == 0)
+ break; /* success, break to skip sleep */
+ }
+ } else {
+ /*
+ * Use a combined read for newer chips.
+ * Unfortunately the smbus functions are not suitable due to
+ * the 32 byte limit of the smbus.
+ * Retries should usually not be needed, but are kept just to
+ * be safe on the safe side.
+ */
+ for (count = 0; count < MAX_COUNT; count++) {
+ rc = dm_i2c_read(dev, addr, buffer, len);
+ if (rc == 0)
+ break; /* break here to skip sleep */
+ udelay(SLEEP_DURATION_US);
+ }
+ }
+
+ /* Take care of 'guard time' */
+ udelay(SLEEP_DURATION_US);
+ if (rc)
+ return rc;
+
+ return 0;
+}
+
+static int tpm_tis_i2c_write_generic(struct udevice *dev, u8 addr,
+ const u8 *buffer, size_t len,
+ unsigned int sleep_time_us, u8 max_count)
+{
+ struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
+ struct tpm_chip *chip = dev_get_priv(dev);
+ int rc = 0;
+ int count;
+
+ if (chip->chip_type == SLB9635) {
+ /* Prepare send buffer to include the address */
+ priv->buf[0] = addr;
+ memcpy(&(priv->buf[1]), buffer, len);
+ buffer = priv->buf;
+ len++;
+ addr = 0;
+ }
+
+ for (count = 0; count < max_count; count++) {
+ rc = dm_i2c_write(dev, addr, buffer, len);
+ if (rc == 0)
+ break; /* Success, break to skip sleep */
+ udelay(sleep_time_us);
+ }
+
+ /* take care of 'guard time' */
+ udelay(sleep_time_us);
+ if (rc)
+ return rc;
+
+ return 0;
+}
+
+/*
+ * tpm_tis_i2c_write() - write to TPM register
+ * @addr: register address to write to
+ * @buffer: containing data to be written
+ * @len: number of bytes to write
+ *
+ * Write len bytes from provided buffer to TPM register (little
+ * endian format, i.e. buffer[0] is written as first byte).
+ *
+ * NOTE: TPM is big-endian for multi-byte values. Multi-byte
+ * values have to be swapped.
+ *
+ * NOTE: use this function instead of the tpm_tis_i2c_write_generic function.
+ *
+ * Return -EIO on error, 0 on success
+ */
+static int tpm_tis_i2c_write(struct udevice *dev, u8 addr, const u8 *buffer,
+ size_t len)
+{
+ return tpm_tis_i2c_write_generic(dev, addr, buffer, len,
+ SLEEP_DURATION_US, MAX_COUNT);
+}
+
+/*
+ * This function is needed especially for the cleanup situation after
+ * sending TPM_READY
+ */
+static int tpm_tis_i2c_write_long(struct udevice *dev, u8 addr, u8 *buffer,
+ size_t len)
+{
+ return tpm_tis_i2c_write_generic(dev, addr, buffer, len,
+ SLEEP_DURATION_LONG_US,
+ MAX_COUNT_LONG);
+}
+
+static int tpm_tis_i2c_check_locality(struct udevice *dev, int loc)
+{
+ const u8 mask = TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID;
+ struct tpm_chip *chip = dev_get_priv(dev);
+ u8 buf;
+ int rc;
+
+ rc = tpm_tis_i2c_read(dev, TPM_ACCESS(loc), &buf, 1);
+ if (rc < 0)
+ return rc;
+
+ if ((buf & mask) == mask) {
+ chip->locality = loc;
+ return loc;
+ }
+
+ return -ENOENT;
+}
+
+static void tpm_tis_i2c_release_locality(struct udevice *dev, int loc,
+ int force)
+{
+ const u8 mask = TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID;
+ u8 buf;
+
+ if (tpm_tis_i2c_read(dev, TPM_ACCESS(loc), &buf, 1) < 0)
+ return;
+
+ if (force || (buf & mask) == mask) {
+ buf = TPM_ACCESS_ACTIVE_LOCALITY;
+ tpm_tis_i2c_write(dev, TPM_ACCESS(loc), &buf, 1);
+ }
+}
+
+static int tpm_tis_i2c_request_locality(struct udevice *dev, int loc)
+{
+ struct tpm_chip *chip = dev_get_priv(dev);
+ unsigned long start, stop;
+ u8 buf = TPM_ACCESS_REQUEST_USE;
+ int rc;
+
+ rc = tpm_tis_i2c_check_locality(dev, loc);
+ if (rc >= 0) {
+ debug("%s: Already have locality\n", __func__);
+ return loc; /* We already have the locality */
+ } else if (rc != -ENOENT) {
+ debug("%s: Failed to get locality: %d\n", __func__, rc);
+ return rc;
+ }
+
+ rc = tpm_tis_i2c_write(dev, TPM_ACCESS(loc), &buf, 1);
+ if (rc) {
+ debug("%s: Failed to write to TPM: %d\n", __func__, rc);
+ return rc;
+ }
+
+ /* Wait for burstcount */
+ start = get_timer(0);
+ stop = chip->timeout_a;
+ do {
+ rc = tpm_tis_i2c_check_locality(dev, loc);
+ if (rc >= 0) {
+ debug("%s: Have locality\n", __func__);
+ return loc;
+ } else if (rc != -ENOENT) {
+ debug("%s: Failed to get locality: %d\n", __func__, rc);
+ return rc;
+ }
+ mdelay(TPM_TIMEOUT_MS);
+ } while (get_timer(start) < stop);
+ debug("%s: Timeout getting locality: %d\n", __func__, rc);
+
+ return rc;
+}
+
+static u8 tpm_tis_i2c_status(struct udevice *dev)
+{
+ struct tpm_chip *chip = dev_get_priv(dev);
+ /* NOTE: Since i2c read may fail, return 0 in this case --> time-out */
+ u8 buf;
+
+ if (tpm_tis_i2c_read(dev, TPM_STS(chip->locality), &buf, 1) < 0)
+ return 0;
+ else
+ return buf;
+}
+
+static int tpm_tis_i2c_ready(struct udevice *dev)
+{
+ struct tpm_chip *chip = dev_get_priv(dev);
+ int rc;
+
+ /* This causes the current command to be aborted */
+ u8 buf = TPM_STS_COMMAND_READY;
+
+ debug("%s\n", __func__);
+ rc = tpm_tis_i2c_write_long(dev, TPM_STS(chip->locality), &buf, 1);
+ if (rc)
+ debug("%s: rc=%d\n", __func__, rc);
+
+ return rc;
+}
+
+static ssize_t tpm_tis_i2c_get_burstcount(struct udevice *dev)
+{
+ struct tpm_chip *chip = dev_get_priv(dev);
+ unsigned long start, stop;
+ ssize_t burstcnt;
+ u8 addr, buf[3];
+
+ /* Wait for burstcount */
+ /* XXX: Which timeout value? Spec has 2 answers (c & d) */
+ start = get_timer(0);
+ stop = chip->timeout_d;
+ do {
+ /* Note: STS is little endian */
+ addr = TPM_STS(chip->locality) + 1;
+ if (tpm_tis_i2c_read(dev, addr, buf, 3) < 0)
+ burstcnt = 0;
+ else
+ burstcnt = (buf[2] << 16) + (buf[1] << 8) + buf[0];
+
+ if (burstcnt)
+ return burstcnt;
+ mdelay(TPM_TIMEOUT_MS);
+ } while (get_timer(start) < stop);
+
+ return -EBUSY;
+}
+
+static int tpm_tis_i2c_wait_for_stat(struct udevice *dev, u8 mask,
+ unsigned long timeout, int *status)
+{
+ unsigned long start, stop;
+
+ /* Check current status */
+ *status = tpm_tis_i2c_status(dev);
+ if ((*status & mask) == mask)
+ return 0;
+
+ start = get_timer(0);
+ stop = timeout;
+ do {
+ mdelay(TPM_TIMEOUT_MS);
+ *status = tpm_tis_i2c_status(dev);
+ if ((*status & mask) == mask)
+ return 0;
+ } while (get_timer(start) < stop);
+
+ return -ETIMEDOUT;
+}
+
+static int tpm_tis_i2c_recv_data(struct udevice *dev, u8 *buf, size_t count)
+{
+ struct tpm_chip *chip = dev_get_priv(dev);
+ size_t size = 0;
+ ssize_t burstcnt;
+ int rc;
+
+ while (size < count) {
+ burstcnt = tpm_tis_i2c_get_burstcount(dev);
+
+ /* burstcount < 0 -> tpm is busy */
+ if (burstcnt < 0)
+ return burstcnt;
+
+ /* Limit received data to max left */
+ if (burstcnt > (count - size))
+ burstcnt = count - size;
+
+ rc = tpm_tis_i2c_read(dev, TPM_DATA_FIFO(chip->locality),
+ &(buf[size]), burstcnt);
+ if (rc == 0)
+ size += burstcnt;
+ }
+
+ return size;
+}
+
+static int tpm_tis_i2c_recv(struct udevice *dev, u8 *buf, size_t count)
+{
+ struct tpm_chip *chip = dev_get_priv(dev);
+ int size = 0;
+ int expected, status;
+ int rc;
+
+ status = tpm_tis_i2c_status(dev);
+ if (status == TPM_STS_COMMAND_READY)
+ return -EINTR;
+ if ((status & (TPM_STS_DATA_AVAIL | TPM_STS_VALID)) !=
+ (TPM_STS_DATA_AVAIL | TPM_STS_VALID))
+ return -EAGAIN;
+
+ debug("...got it;\n");
+
+ /* Read first 10 bytes, including tag, paramsize, and result */
+ size = tpm_tis_i2c_recv_data(dev, buf, TPM_HEADER_SIZE);
+ if (size < TPM_HEADER_SIZE) {
+ debug("Unable to read header\n");
+ return size < 0 ? size : -EIO;
+ }
+
+ expected = get_unaligned_be32(buf + TPM_RSP_SIZE_BYTE);
+ if ((size_t)expected > count) {
+ debug("Error size=%x, expected=%x, count=%x\n", size, expected,
+ count);
+ return -ENOSPC;
+ }
+
+ size += tpm_tis_i2c_recv_data(dev, &buf[TPM_HEADER_SIZE],
+ expected - TPM_HEADER_SIZE);
+ if (size < expected) {
+ debug("Unable to read remainder of result\n");
+ return -ETIMEDOUT;
+ }
+
+ rc = tpm_tis_i2c_wait_for_stat(dev, TPM_STS_VALID, chip->timeout_c,
+ &status);
+ if (rc)
+ return rc;
+ if (status & TPM_STS_DATA_AVAIL) { /* Retry? */
+ debug("Error left over data\n");
+ return -EIO;
+ }
+
+ return size;
+}
+
+static int tpm_tis_i2c_send(struct udevice *dev, const u8 *buf, size_t len)
+{
+ struct tpm_chip *chip = dev_get_priv(dev);
+ int rc, status;
+ size_t burstcnt;
+ size_t count = 0;
+ int retry = 0;
+ u8 sts = TPM_STS_GO;
+
+ debug("%s: len=%d\n", __func__, len);
+ if (len > TPM_DEV_BUFSIZE)
+ return -E2BIG; /* Command is too long for our tpm, sorry */
+
+ if (tpm_tis_i2c_request_locality(dev, 0) < 0)
+ return -EBUSY;
+
+ status = tpm_tis_i2c_status(dev);
+ if ((status & TPM_STS_COMMAND_READY) == 0) {
+ rc = tpm_tis_i2c_ready(dev);
+ if (rc)
+ return rc;
+ rc = tpm_tis_i2c_wait_for_stat(dev, TPM_STS_COMMAND_READY,
+ chip->timeout_b, &status);
+ if (rc)
+ return rc;
+ }
+
+ burstcnt = tpm_tis_i2c_get_burstcount(dev);
+
+ /* burstcount < 0 -> tpm is busy */
+ if (burstcnt < 0)
+ return burstcnt;
+
+ while (count < len) {
+ udelay(300);
+ if (burstcnt > len - count)
+ burstcnt = len - count;
+
+#ifdef CONFIG_TPM_TIS_I2C_BURST_LIMITATION
+ if (retry && burstcnt > CONFIG_TPM_TIS_I2C_BURST_LIMITATION_LEN)
+ burstcnt = CONFIG_TPM_TIS_I2C_BURST_LIMITATION_LEN;
+#endif /* CONFIG_TPM_TIS_I2C_BURST_LIMITATION */
+
+ rc = tpm_tis_i2c_write(dev, TPM_DATA_FIFO(chip->locality),
+ &(buf[count]), burstcnt);
+ if (rc == 0)
+ count += burstcnt;
+ else {
+ debug("%s: error\n", __func__);
+ if (retry++ > 10)
+ return -EIO;
+ rc = tpm_tis_i2c_wait_for_stat(dev, TPM_STS_VALID,
+ chip->timeout_c,
+ &status);
+ if (rc)
+ return rc;
+
+ if ((status & TPM_STS_DATA_EXPECT) == 0)
+ return -EIO;
+ }
+ }
+
+ /* Go and do it */
+ rc = tpm_tis_i2c_write(dev, TPM_STS(chip->locality), &sts, 1);
+ if (rc < 0)
+ return rc;
+ debug("%s: done, rc=%d\n", __func__, rc);
+
+ return len;
+}
+
+static int tpm_tis_i2c_cleanup(struct udevice *dev)
+{
+ struct tpm_chip *chip = dev_get_priv(dev);
+
+ tpm_tis_i2c_ready(dev);
+ /*
+ * The TPM needs some time to clean up here,
+ * so we sleep rather than keeping the bus busy
+ */
+ mdelay(2);
+ tpm_tis_i2c_release_locality(dev, chip->locality, 0);
+
+ return 0;
+}
+
+static int tpm_tis_i2c_init(struct udevice *dev)
+{
+ struct tpm_chip *chip = dev_get_priv(dev);
+ u32 vendor;
+ u32 expected_did_vid;
+ int rc;
+
+ 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;
+
+ rc = tpm_tis_i2c_request_locality(dev, 0);
+ if (rc < 0)
+ return rc;
+
+ /* Read four bytes from DID_VID register */
+ if (tpm_tis_i2c_read(dev, TPM_DID_VID(0), (uchar *)&vendor, 4) < 0) {
+ tpm_tis_i2c_release_locality(dev, 0, 1);
+ return -EIO;
+ }
+
+ if (chip->chip_type == SLB9635) {
+ vendor = be32_to_cpu(vendor);
+ expected_did_vid = TPM_TIS_I2C_DID_VID_9635;
+ } else {
+ /* device id and byte order has changed for newer i2c tpms */
+ expected_did_vid = TPM_TIS_I2C_DID_VID_9645;
+ }
+
+ if (chip->chip_type != UNKNOWN && vendor != expected_did_vid) {
+ error("Vendor id did not match! ID was %08x\n", vendor);
+ return -ENODEV;
+ }
+
+ chip->vend_dev = vendor;
+ debug("1.2 TPM (chip type %s device-id 0x%X)\n",
+ chip_name[chip->chip_type], vendor >> 16);
+
+ /*
+ * A timeout query to TPM can be placed here.
+ * Standard timeout values are used so far
+ */
+
+ return 0;
+}
+
+static int tpm_tis_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 = tpm_tis_i2c_init(dev);
+ if (rc < 0)
+ chip->is_open = 0;
+
+ return rc;
+}
+
+static int tpm_tis_i2c_close(struct udevice *dev)
+{
+ struct tpm_chip *chip = dev_get_priv(dev);
+
+ if (chip->is_open) {
+ tpm_tis_i2c_release_locality(dev, chip->locality, 1);
+ chip->is_open = 0;
+ chip->vend_dev = 0;
+ }
+
+ return 0;
+}
+
+static int tpm_tis_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",
+ chip_name[chip->chip_type],
+ chip->vend_dev >> 16);
+}
+
+static int tpm_tis_i2c_probe(struct udevice *dev)
+{
+ struct tpm_chip_priv *uc_priv = dev_get_uclass_priv(dev);
+ struct tpm_chip *chip = dev_get_priv(dev);
+
+ chip->chip_type = dev_get_driver_data(dev);
+
+ /* TODO: These need to be checked and tuned */
+ uc_priv->duration_ms[TPM_SHORT] = TIS_SHORT_TIMEOUT_MS;
+ uc_priv->duration_ms[TPM_MEDIUM] = TIS_LONG_TIMEOUT_MS;
+ uc_priv->duration_ms[TPM_LONG] = TIS_LONG_TIMEOUT_MS;
+ uc_priv->retry_time_ms = TPM_TIMEOUT_MS;
+
+ return 0;
+}
+
+static const struct tpm_ops tpm_tis_i2c_ops = {
+ .open = tpm_tis_i2c_open,
+ .close = tpm_tis_i2c_close,
+ .get_desc = tpm_tis_get_desc,
+ .send = tpm_tis_i2c_send,
+ .recv = tpm_tis_i2c_recv,
+ .cleanup = tpm_tis_i2c_cleanup,
+};
+
+static const struct udevice_id tpm_tis_i2c_ids[] = {
+ { .compatible = "infineon,slb9635tt", .data = SLB9635 },
+ { .compatible = "infineon,slb9645tt", .data = SLB9645 },
+ { }
+};
+
+U_BOOT_DRIVER(tpm_tis_i2c) = {
+ .name = "tpm_tis_infineon",
+ .id = UCLASS_TPM,
+ .of_match = tpm_tis_i2c_ids,
+ .ops = &tpm_tis_i2c_ops,
+ .probe = tpm_tis_i2c_probe,
+ .priv_auto_alloc_size = sizeof(struct tpm_chip),
+};
--- /dev/null
+/*
+ * Copyright (C) 2011 Infineon Technologies
+ *
+ * Authors:
+ * Peter Huewe <huewe.external@infineon.com>
+ *
+ * Version: 2.1.1
+ *
+ * Description:
+ * Device driver for TCG/TCPA TPM (trusted platform module).
+ * Specifications at www.trustedcomputinggroup.org
+ *
+ * It is based on the Linux kernel driver tpm.c from Leendert van
+ * Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#ifndef _TPM_TIS_I2C_H
+#define _TPM_TIS_I2C_H
+
+#include <linux/compiler.h>
+#include <linux/types.h>
+
+enum tpm_timeout {
+ TPM_TIMEOUT_MS = 5,
+ TIS_SHORT_TIMEOUT_MS = 750,
+ TIS_LONG_TIMEOUT_MS = 2000,
+ SLEEP_DURATION_US = 60,
+ SLEEP_DURATION_LONG_US = 210,
+};
+
+/* Size of external transmit buffer (used in tpm_transmit)*/
+#define TPM_BUFSIZE 4096
+
+/* Index of Count field in TPM response buffer */
+#define TPM_RSP_SIZE_BYTE 2
+#define TPM_RSP_RC_BYTE 6
+
+enum i2c_chip_type {
+ SLB9635,
+ SLB9645,
+ UNKNOWN,
+};
+
+struct tpm_chip {
+ int is_open;
+ int locality;
+ u32 vend_dev;
+ unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* msec */
+ enum i2c_chip_type chip_type;
+};
+
+struct tpm_input_header {
+ __be16 tag;
+ __be32 length;
+ __be32 ordinal;
+} __packed;
+
+struct tpm_output_header {
+ __be16 tag;
+ __be32 length;
+ __be32 return_code;
+} __packed;
+
+struct timeout_t {
+ __be32 a;
+ __be32 b;
+ __be32 c;
+ __be32 d;
+} __packed;
+
+struct duration_t {
+ __be32 tpm_short;
+ __be32 tpm_medium;
+ __be32 tpm_long;
+} __packed;
+
+union cap_t {
+ struct timeout_t timeout;
+ struct duration_t duration;
+};
+
+struct tpm_getcap_params_in {
+ __be32 cap;
+ __be32 subcap_size;
+ __be32 subcap;
+} __packed;
+
+struct tpm_getcap_params_out {
+ __be32 cap_size;
+ union cap_t cap;
+} __packed;
+
+union tpm_cmd_header {
+ struct tpm_input_header in;
+ struct tpm_output_header out;
+};
+
+union tpm_cmd_params {
+ struct tpm_getcap_params_out getcap_out;
+ struct tpm_getcap_params_in getcap_in;
+};
+
+struct tpm_cmd_t {
+ union tpm_cmd_header header;
+ union tpm_cmd_params params;
+} __packed;
+
+/* Max number of iterations after i2c NAK */
+#define MAX_COUNT 3
+
+/*
+ * Max number of iterations after i2c NAK for 'long' commands
+ *
+ * We need this especially for sending TPM_READY, since the cleanup after the
+ * transtion to the ready state may take some time, but it is unpredictable
+ * how long it will take.
+ */
+#define MAX_COUNT_LONG 50
+
+enum tis_access {
+ TPM_ACCESS_VALID = 0x80,
+ TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
+ TPM_ACCESS_REQUEST_PENDING = 0x04,
+ TPM_ACCESS_REQUEST_USE = 0x02,
+};
+
+enum tis_status {
+ TPM_STS_VALID = 0x80,
+ TPM_STS_COMMAND_READY = 0x40,
+ TPM_STS_GO = 0x20,
+ TPM_STS_DATA_AVAIL = 0x10,
+ TPM_STS_DATA_EXPECT = 0x08,
+};
+
+/* expected value for DIDVID register */
+#define TPM_TIS_I2C_DID_VID_9635 0x000b15d1L
+#define TPM_TIS_I2C_DID_VID_9645 0x001a15d1L
+
+#define TPM_ACCESS(l) (0x0000 | ((l) << 4))
+#define TPM_STS(l) (0x0001 | ((l) << 4))
+#define TPM_DATA_FIFO(l) (0x0005 | ((l) << 4))
+#define TPM_DID_VID(l) (0x0006 | ((l) << 4))
+
+#endif
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