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![Miquel Raynal](/assets/img/avatar_default.png)
There are no changes in this commit but a new organization of the code as follow. * cmd/ directory: > move existing code from cmd/tpm.c in cmd/tpm-common.c > move specific code in cmd/tpm-v1.c > create a specific header file with generic definitions for commands only called cmd/tpm-user-utils.h * lib/ directory: > move existing code from lib/tpm.c in lib/tpm-common.c > move specific code in lib/tpm-v1.c > create a specific header file with generic definitions for the library itself called lib/tpm-utils.h * include/ directory: > move existing code from include/tpm.h in include/tpm-common.h > move specific code in include/tpm-v1.h Code designated as 'common' is compiled if TPM are used. Code designated as 'specific' is compiled only if the right specification has been selected. All files include tpm-common.h. Files in cmd/ include tpm-user-utils.h. Files in lib/ include tpm-utils.h. Depending on the specification, files may include either (not both) tpm-v1.h or tpm-v2.h. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Reviewed-by: Tom Rini <trini@konsulko.com> [trini: Fix a few more cases of tpm.h -> tpm-v1.h, some Kconfig logic] Signed-off-by: Tom Rini <trini@konsulko.com>
636 lines
15 KiB
C
636 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2011 Infineon Technologies
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*
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* Authors:
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* Peter Huewe <huewe.external@infineon.com>
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*
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* Description:
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* Device driver for TCG/TCPA TPM (trusted platform module).
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* Specifications at www.trustedcomputinggroup.org
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*
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* This device driver implements the TPM interface as defined in
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* the TCG TPM Interface Spec version 1.2, revision 1.0 and the
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* Infineon I2C Protocol Stack Specification v0.20.
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*
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* It is based on the Linux kernel driver tpm.c from Leendert van
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* Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall.
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*
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* Version: 2.1.1
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*/
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#include <common.h>
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#include <dm.h>
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#include <fdtdec.h>
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#include <i2c.h>
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#include <tpm-v1.h>
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#include <linux/errno.h>
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#include <linux/compiler.h>
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#include <linux/types.h>
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#include <linux/unaligned/be_byteshift.h>
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#include "tpm_tis.h"
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#include "tpm_internal.h"
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enum i2c_chip_type {
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SLB9635,
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SLB9645,
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UNKNOWN,
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};
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/* expected value for DIDVID register */
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#define TPM_TIS_I2C_DID_VID_9635 0x000b15d1L
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#define TPM_TIS_I2C_DID_VID_9645 0x001a15d1L
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static const char * const chip_name[] = {
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[SLB9635] = "slb9635tt",
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[SLB9645] = "slb9645tt",
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[UNKNOWN] = "unknown/fallback to slb9635",
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};
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#define TPM_ACCESS(l) (0x0000 | ((l) << 4))
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#define TPM_STS(l) (0x0001 | ((l) << 4))
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#define TPM_DATA_FIFO(l) (0x0005 | ((l) << 4))
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#define TPM_DID_VID(l) (0x0006 | ((l) << 4))
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/*
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* tpm_tis_i2c_read() - read from TPM register
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* @addr: register address to read from
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* @buffer: provided by caller
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* @len: number of bytes to read
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*
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* Read len bytes from TPM register and put them into
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* buffer (little-endian format, i.e. first byte is put into buffer[0]).
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*
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* NOTE: TPM is big-endian for multi-byte values. Multi-byte
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* values have to be swapped.
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*
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* Return -EIO on error, 0 on success.
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*/
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static int tpm_tis_i2c_read(struct udevice *dev, u8 addr, u8 *buffer,
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size_t len)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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int rc;
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int count;
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uint32_t addrbuf = addr;
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if ((chip->chip_type == SLB9635) || (chip->chip_type == UNKNOWN)) {
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/* slb9635 protocol should work in both cases */
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for (count = 0; count < MAX_COUNT; count++) {
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rc = dm_i2c_write(dev, 0, (uchar *)&addrbuf, 1);
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if (rc == 0)
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break; /* Success, break to skip sleep */
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udelay(SLEEP_DURATION_US);
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}
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if (rc)
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return rc;
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/* After the TPM has successfully received the register address
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* it needs some time, thus we're sleeping here again, before
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* retrieving the data
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*/
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for (count = 0; count < MAX_COUNT; count++) {
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udelay(SLEEP_DURATION_US);
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rc = dm_i2c_read(dev, 0, buffer, len);
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if (rc == 0)
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break; /* success, break to skip sleep */
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}
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} else {
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/*
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* Use a combined read for newer chips.
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* Unfortunately the smbus functions are not suitable due to
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* the 32 byte limit of the smbus.
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* Retries should usually not be needed, but are kept just to
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* be safe on the safe side.
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*/
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for (count = 0; count < MAX_COUNT; count++) {
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rc = dm_i2c_read(dev, addr, buffer, len);
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if (rc == 0)
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break; /* break here to skip sleep */
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udelay(SLEEP_DURATION_US);
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}
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}
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/* Take care of 'guard time' */
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udelay(SLEEP_DURATION_US);
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if (rc)
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return rc;
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return 0;
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}
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static int tpm_tis_i2c_write_generic(struct udevice *dev, u8 addr,
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const u8 *buffer, size_t len,
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unsigned int sleep_time_us, u8 max_count)
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{
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struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
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struct tpm_chip *chip = dev_get_priv(dev);
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int rc = 0;
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int count;
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if (chip->chip_type == SLB9635) {
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/* Prepare send buffer to include the address */
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priv->buf[0] = addr;
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memcpy(&(priv->buf[1]), buffer, len);
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buffer = priv->buf;
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len++;
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addr = 0;
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}
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for (count = 0; count < max_count; count++) {
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rc = dm_i2c_write(dev, addr, buffer, len);
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if (rc == 0)
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break; /* Success, break to skip sleep */
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udelay(sleep_time_us);
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}
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/* take care of 'guard time' */
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udelay(sleep_time_us);
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if (rc)
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return rc;
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return 0;
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}
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/*
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* tpm_tis_i2c_write() - write to TPM register
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* @addr: register address to write to
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* @buffer: containing data to be written
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* @len: number of bytes to write
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*
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* Write len bytes from provided buffer to TPM register (little
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* endian format, i.e. buffer[0] is written as first byte).
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*
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* NOTE: TPM is big-endian for multi-byte values. Multi-byte
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* values have to be swapped.
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*
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* NOTE: use this function instead of the tpm_tis_i2c_write_generic function.
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*
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* Return -EIO on error, 0 on success
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*/
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static int tpm_tis_i2c_write(struct udevice *dev, u8 addr, const u8 *buffer,
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size_t len)
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{
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return tpm_tis_i2c_write_generic(dev, addr, buffer, len,
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SLEEP_DURATION_US, MAX_COUNT);
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}
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/*
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* This function is needed especially for the cleanup situation after
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* sending TPM_READY
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*/
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static int tpm_tis_i2c_write_long(struct udevice *dev, u8 addr, u8 *buffer,
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size_t len)
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{
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return tpm_tis_i2c_write_generic(dev, addr, buffer, len,
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SLEEP_DURATION_LONG_US,
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MAX_COUNT_LONG);
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}
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static int tpm_tis_i2c_check_locality(struct udevice *dev, int loc)
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{
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const u8 mask = TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID;
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struct tpm_chip *chip = dev_get_priv(dev);
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u8 buf;
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int rc;
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rc = tpm_tis_i2c_read(dev, TPM_ACCESS(loc), &buf, 1);
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if (rc < 0)
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return rc;
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if ((buf & mask) == mask) {
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chip->locality = loc;
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return loc;
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}
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return -ENOENT;
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}
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static void tpm_tis_i2c_release_locality(struct udevice *dev, int loc,
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int force)
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{
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const u8 mask = TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID;
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u8 buf;
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if (tpm_tis_i2c_read(dev, TPM_ACCESS(loc), &buf, 1) < 0)
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return;
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if (force || (buf & mask) == mask) {
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buf = TPM_ACCESS_ACTIVE_LOCALITY;
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tpm_tis_i2c_write(dev, TPM_ACCESS(loc), &buf, 1);
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}
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}
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static int tpm_tis_i2c_request_locality(struct udevice *dev, int loc)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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unsigned long start, stop;
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u8 buf = TPM_ACCESS_REQUEST_USE;
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int rc;
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rc = tpm_tis_i2c_check_locality(dev, loc);
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if (rc >= 0) {
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debug("%s: Already have locality\n", __func__);
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return loc; /* We already have the locality */
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} else if (rc != -ENOENT) {
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debug("%s: Failed to get locality: %d\n", __func__, rc);
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return rc;
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}
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rc = tpm_tis_i2c_write(dev, TPM_ACCESS(loc), &buf, 1);
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if (rc) {
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debug("%s: Failed to write to TPM: %d\n", __func__, rc);
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return rc;
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}
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/* Wait for burstcount */
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start = get_timer(0);
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stop = chip->timeout_a;
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do {
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rc = tpm_tis_i2c_check_locality(dev, loc);
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if (rc >= 0) {
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debug("%s: Have locality\n", __func__);
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return loc;
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} else if (rc != -ENOENT) {
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debug("%s: Failed to get locality: %d\n", __func__, rc);
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return rc;
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}
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mdelay(TPM_TIMEOUT_MS);
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} while (get_timer(start) < stop);
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debug("%s: Timeout getting locality: %d\n", __func__, rc);
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return rc;
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}
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static u8 tpm_tis_i2c_status(struct udevice *dev)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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/* NOTE: Since i2c read may fail, return 0 in this case --> time-out */
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u8 buf;
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if (tpm_tis_i2c_read(dev, TPM_STS(chip->locality), &buf, 1) < 0)
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return 0;
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else
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return buf;
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}
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static int tpm_tis_i2c_ready(struct udevice *dev)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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int rc;
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/* This causes the current command to be aborted */
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u8 buf = TPM_STS_COMMAND_READY;
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debug("%s\n", __func__);
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rc = tpm_tis_i2c_write_long(dev, TPM_STS(chip->locality), &buf, 1);
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if (rc)
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debug("%s: rc=%d\n", __func__, rc);
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return rc;
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}
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static ssize_t tpm_tis_i2c_get_burstcount(struct udevice *dev)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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unsigned long start, stop;
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ssize_t burstcnt;
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u8 addr, buf[3];
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/* Wait for burstcount */
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/* XXX: Which timeout value? Spec has 2 answers (c & d) */
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start = get_timer(0);
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stop = chip->timeout_d;
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do {
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/* Note: STS is little endian */
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addr = TPM_STS(chip->locality) + 1;
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if (tpm_tis_i2c_read(dev, addr, buf, 3) < 0)
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burstcnt = 0;
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else
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burstcnt = (buf[2] << 16) + (buf[1] << 8) + buf[0];
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if (burstcnt)
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return burstcnt;
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mdelay(TPM_TIMEOUT_MS);
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} while (get_timer(start) < stop);
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return -EBUSY;
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}
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static int tpm_tis_i2c_wait_for_stat(struct udevice *dev, u8 mask,
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unsigned long timeout, int *status)
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{
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unsigned long start, stop;
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/* Check current status */
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*status = tpm_tis_i2c_status(dev);
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if ((*status & mask) == mask)
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return 0;
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start = get_timer(0);
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stop = timeout;
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do {
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mdelay(TPM_TIMEOUT_MS);
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*status = tpm_tis_i2c_status(dev);
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if ((*status & mask) == mask)
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return 0;
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} while (get_timer(start) < stop);
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return -ETIMEDOUT;
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}
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static int tpm_tis_i2c_recv_data(struct udevice *dev, u8 *buf, size_t count)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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size_t size = 0;
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ssize_t burstcnt;
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int rc;
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while (size < count) {
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burstcnt = tpm_tis_i2c_get_burstcount(dev);
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/* burstcount < 0 -> tpm is busy */
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if (burstcnt < 0)
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return burstcnt;
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/* Limit received data to max left */
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if (burstcnt > (count - size))
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burstcnt = count - size;
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rc = tpm_tis_i2c_read(dev, TPM_DATA_FIFO(chip->locality),
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&(buf[size]), burstcnt);
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if (rc == 0)
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size += burstcnt;
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}
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return size;
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}
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static int tpm_tis_i2c_recv(struct udevice *dev, u8 *buf, size_t count)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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int size = 0;
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int status;
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unsigned int expected;
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int rc;
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status = tpm_tis_i2c_status(dev);
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if (status == TPM_STS_COMMAND_READY)
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return -EINTR;
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if ((status & (TPM_STS_DATA_AVAIL | TPM_STS_VALID)) !=
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(TPM_STS_DATA_AVAIL | TPM_STS_VALID))
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return -EAGAIN;
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debug("...got it;\n");
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/* Read first 10 bytes, including tag, paramsize, and result */
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size = tpm_tis_i2c_recv_data(dev, buf, TPM_HEADER_SIZE);
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if (size < TPM_HEADER_SIZE) {
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debug("Unable to read header\n");
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return size < 0 ? size : -EIO;
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}
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expected = get_unaligned_be32(buf + TPM_RSP_SIZE_BYTE);
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if ((size_t)expected > count || (size_t)expected < TPM_HEADER_SIZE) {
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debug("Error size=%x, expected=%x, count=%x\n", size, expected,
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count);
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return -ENOSPC;
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}
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size += tpm_tis_i2c_recv_data(dev, &buf[TPM_HEADER_SIZE],
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expected - TPM_HEADER_SIZE);
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if (size < expected) {
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debug("Unable to read remainder of result\n");
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return -ETIMEDOUT;
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}
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rc = tpm_tis_i2c_wait_for_stat(dev, TPM_STS_VALID, chip->timeout_c,
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&status);
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if (rc)
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return rc;
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if (status & TPM_STS_DATA_AVAIL) { /* Retry? */
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debug("Error left over data\n");
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return -EIO;
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}
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return size;
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}
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static int tpm_tis_i2c_send(struct udevice *dev, const u8 *buf, size_t len)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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int rc, status;
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size_t burstcnt;
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size_t count = 0;
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int retry = 0;
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u8 sts = TPM_STS_GO;
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debug("%s: len=%d\n", __func__, len);
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if (len > TPM_DEV_BUFSIZE)
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return -E2BIG; /* Command is too long for our tpm, sorry */
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if (tpm_tis_i2c_request_locality(dev, 0) < 0)
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return -EBUSY;
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status = tpm_tis_i2c_status(dev);
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if ((status & TPM_STS_COMMAND_READY) == 0) {
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rc = tpm_tis_i2c_ready(dev);
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if (rc)
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return rc;
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rc = tpm_tis_i2c_wait_for_stat(dev, TPM_STS_COMMAND_READY,
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chip->timeout_b, &status);
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if (rc)
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return rc;
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}
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burstcnt = tpm_tis_i2c_get_burstcount(dev);
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/* burstcount < 0 -> tpm is busy */
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if (burstcnt < 0)
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return burstcnt;
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while (count < len) {
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udelay(300);
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if (burstcnt > len - count)
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burstcnt = len - count;
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#ifdef CONFIG_TPM_TIS_I2C_BURST_LIMITATION
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if (retry && burstcnt > CONFIG_TPM_TIS_I2C_BURST_LIMITATION_LEN)
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burstcnt = CONFIG_TPM_TIS_I2C_BURST_LIMITATION_LEN;
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#endif /* CONFIG_TPM_TIS_I2C_BURST_LIMITATION */
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rc = tpm_tis_i2c_write(dev, TPM_DATA_FIFO(chip->locality),
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&(buf[count]), burstcnt);
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if (rc == 0)
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count += burstcnt;
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else {
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debug("%s: error\n", __func__);
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if (retry++ > 10)
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return -EIO;
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rc = tpm_tis_i2c_wait_for_stat(dev, TPM_STS_VALID,
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chip->timeout_c,
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&status);
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if (rc)
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return rc;
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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) {
|
|
pr_err("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),
|
|
};
|