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upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/drivers/tpm/tpm_tis_i2c.c

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/*
* 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 <linux/compiler.h>
#include <i2c.h>
#include <tpm.h>
#include <asm-generic/errno.h>
#include <linux/types.h>
#include <linux/unaligned/be_byteshift.h>
#include "tpm_tis_i2c.h"
DECLARE_GLOBAL_DATA_PTR;
/* Max buffer size supported by our tpm */
#define TPM_DEV_BUFSIZE 1260
/* 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
#define SLEEP_DURATION 60 /* in usec */
#define SLEEP_DURATION_LONG 210 /* in usec */
#define TPM_HEADER_SIZE 10
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,
};
enum tis_defaults {
TIS_SHORT_TIMEOUT = 750, /* ms */
TIS_LONG_TIMEOUT = 2000, /* ms */
};
/* expected value for DIDVID register */
#define TPM_TIS_I2C_DID_VID_9635 0x000b15d1L
#define TPM_TIS_I2C_DID_VID_9645 0x001a15d1L
enum i2c_chip_type {
SLB9635,
SLB9645,
UNKNOWN,
};
static const char * const chip_name[] = {
[SLB9635] = "slb9635tt",
[SLB9645] = "slb9645tt",
[UNKNOWN] = "unknown/fallback to slb9635",
};
#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))
enum tpm_duration {
TPM_SHORT = 0,
TPM_MEDIUM = 1,
TPM_LONG = 2,
TPM_UNDEFINED,
};
/* Extended error numbers from linux (see errno.h) */
#define ECANCELED 125 /* Operation Canceled */
/* Timer frequency. Corresponds to msec timer resolution*/
#define HZ 1000
#define TPM_MAX_ORDINAL 243
#define TPM_MAX_PROTECTED_ORDINAL 12
#define TPM_PROTECTED_ORDINAL_MASK 0xFF
#define TPM_CMD_COUNT_BYTE 2
#define TPM_CMD_ORDINAL_BYTE 6
/*
* Array with one entry per ordinal defining the maximum amount
* of time the chip could take to return the result. The ordinal
* designation of short, medium or long is defined in a table in
* TCG Specification TPM Main Part 2 TPM Structures Section 17. The
* values of the SHORT, MEDIUM, and LONG durations are retrieved
* from the chip during initialization with a call to tpm_get_timeouts.
*/
static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
TPM_UNDEFINED, /* 0 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 5 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 10 */
TPM_SHORT,
};
static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
TPM_UNDEFINED, /* 0 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 5 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 10 */
TPM_SHORT,
TPM_MEDIUM,
TPM_LONG,
TPM_LONG,
TPM_MEDIUM, /* 15 */
TPM_SHORT,
TPM_SHORT,
TPM_MEDIUM,
TPM_LONG,
TPM_SHORT, /* 20 */
TPM_SHORT,
TPM_MEDIUM,
TPM_MEDIUM,
TPM_MEDIUM,
TPM_SHORT, /* 25 */
TPM_SHORT,
TPM_MEDIUM,
TPM_SHORT,
TPM_SHORT,
TPM_MEDIUM, /* 30 */
TPM_LONG,
TPM_MEDIUM,
TPM_SHORT,
TPM_SHORT,
TPM_SHORT, /* 35 */
TPM_MEDIUM,
TPM_MEDIUM,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_MEDIUM, /* 40 */
TPM_LONG,
TPM_MEDIUM,
TPM_SHORT,
TPM_SHORT,
TPM_SHORT, /* 45 */
TPM_SHORT,
TPM_SHORT,
TPM_SHORT,
TPM_LONG,
TPM_MEDIUM, /* 50 */
TPM_MEDIUM,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 55 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_MEDIUM, /* 60 */
TPM_MEDIUM,
TPM_MEDIUM,
TPM_SHORT,
TPM_SHORT,
TPM_MEDIUM, /* 65 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 70 */
TPM_SHORT,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 75 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_LONG, /* 80 */
TPM_UNDEFINED,
TPM_MEDIUM,
TPM_LONG,
TPM_SHORT,
TPM_UNDEFINED, /* 85 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 90 */
TPM_SHORT,
TPM_SHORT,
TPM_SHORT,
TPM_SHORT,
TPM_UNDEFINED, /* 95 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_MEDIUM, /* 100 */
TPM_SHORT,
TPM_SHORT,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 105 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 110 */
TPM_SHORT,
TPM_SHORT,
TPM_SHORT,
TPM_SHORT,
TPM_SHORT, /* 115 */
TPM_SHORT,
TPM_SHORT,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_LONG, /* 120 */
TPM_LONG,
TPM_MEDIUM,
TPM_UNDEFINED,
TPM_SHORT,
TPM_SHORT, /* 125 */
TPM_SHORT,
TPM_LONG,
TPM_SHORT,
TPM_SHORT,
TPM_SHORT, /* 130 */
TPM_MEDIUM,
TPM_UNDEFINED,
TPM_SHORT,
TPM_MEDIUM,
TPM_UNDEFINED, /* 135 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 140 */
TPM_SHORT,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 145 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 150 */
TPM_MEDIUM,
TPM_MEDIUM,
TPM_SHORT,
TPM_SHORT,
TPM_UNDEFINED, /* 155 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 160 */
TPM_SHORT,
TPM_SHORT,
TPM_SHORT,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 165 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_LONG, /* 170 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 175 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_MEDIUM, /* 180 */
TPM_SHORT,
TPM_MEDIUM,
TPM_MEDIUM,
TPM_MEDIUM,
TPM_MEDIUM, /* 185 */
TPM_SHORT,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 190 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 195 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 200 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT,
TPM_SHORT, /* 205 */
TPM_SHORT,
TPM_SHORT,
TPM_SHORT,
TPM_SHORT,
TPM_MEDIUM, /* 210 */
TPM_UNDEFINED,
TPM_MEDIUM,
TPM_MEDIUM,
TPM_MEDIUM,
TPM_UNDEFINED, /* 215 */
TPM_MEDIUM,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT,
TPM_SHORT, /* 220 */
TPM_SHORT,
TPM_SHORT,
TPM_SHORT,
TPM_SHORT,
TPM_UNDEFINED, /* 225 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 230 */
TPM_LONG,
TPM_MEDIUM,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 235 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 240 */
TPM_UNDEFINED,
TPM_MEDIUM,
};
/* TPM configuration */
struct tpm {
struct udevice *dev;
char inited;
} tpm;
/* Global structure for tpm chip data */
static struct tpm_chip g_chip;
/* Structure to store I2C TPM specific stuff */
struct tpm_dev {
struct udevice *dev;
u8 buf[TPM_DEV_BUFSIZE + sizeof(u8)]; /* Max buffer size + addr */
enum i2c_chip_type chip_type;
};
static struct tpm_dev tpm_dev;
/*
* iic_tpm_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 iic_tpm_read(u8 addr, u8 *buffer, size_t len)
{
int rc;
int count;
uint32_t addrbuf = addr;
if ((tpm_dev.chip_type == SLB9635) || (tpm_dev.chip_type == UNKNOWN)) {
/* slb9635 protocol should work in both cases */
for (count = 0; count < MAX_COUNT; count++) {
rc = dm_i2c_write(tpm_dev.dev, 0, (uchar *)&addrbuf, 1);
if (rc == 0)
break; /* Success, break to skip sleep */
udelay(SLEEP_DURATION);
}
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);
rc = dm_i2c_read(tpm_dev.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(tpm_dev.dev, addr, buffer, len);
if (rc == 0)
break; /* break here to skip sleep */
udelay(SLEEP_DURATION);
}
}
/* Take care of 'guard time' */
udelay(SLEEP_DURATION);
if (rc)
return -rc;
return 0;
}
static int iic_tpm_write_generic(u8 addr, u8 *buffer, size_t len,
unsigned int sleep_time, u8 max_count)
{
int rc = 0;
int count;
for (count = 0; count < max_count; count++) {
rc = dm_i2c_write(tpm_dev.dev, addr, buffer, len);
if (rc == 0)
break; /* Success, break to skip sleep */
udelay(sleep_time);
}
/* take care of 'guard time' */
udelay(sleep_time);
if (rc)
return -rc;
return 0;
}
/*
* iic_tpm_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 iic_tpm_write_generic function.
*
* Return -EIO on error, 0 on success
*/
static int iic_tpm_write(u8 addr, u8 *buffer, size_t len)
{
return iic_tpm_write_generic(addr, buffer, len, SLEEP_DURATION,
MAX_COUNT);
}
/*
* This function is needed especially for the cleanup situation after
* sending TPM_READY
*/
static int iic_tpm_write_long(u8 addr, u8 *buffer, size_t len)
{
return iic_tpm_write_generic(addr, buffer, len, SLEEP_DURATION_LONG,
MAX_COUNT_LONG);
}
static int check_locality(struct tpm_chip *chip, int loc)
{
const u8 mask = TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID;
u8 buf;
int rc;
rc = iic_tpm_read(TPM_ACCESS(loc), &buf, 1);
if (rc < 0)
return rc;
if ((buf & mask) == mask) {
chip->vendor.locality = loc;
return loc;
}
return -1;
}
static void release_locality(struct tpm_chip *chip, int loc, int force)
{
const u8 mask = TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID;
u8 buf;
if (iic_tpm_read(TPM_ACCESS(loc), &buf, 1) < 0)
return;
if (force || (buf & mask) == mask) {
buf = TPM_ACCESS_ACTIVE_LOCALITY;
iic_tpm_write(TPM_ACCESS(loc), &buf, 1);
}
}
static int request_locality(struct tpm_chip *chip, int loc)
{
unsigned long start, stop;
u8 buf = TPM_ACCESS_REQUEST_USE;
int rc;
if (check_locality(chip, loc) >= 0)
return loc; /* We already have the locality */
rc = iic_tpm_write(TPM_ACCESS(loc), &buf, 1);
if (rc)
return rc;
/* Wait for burstcount */
start = get_timer(0);
stop = chip->vendor.timeout_a;
do {
if (check_locality(chip, loc) >= 0)
return loc;
udelay(TPM_TIMEOUT * 1000);
} while (get_timer(start) < stop);
return -1;
}
static u8 tpm_tis_i2c_status(struct tpm_chip *chip)
{
/* NOTE: Since i2c read may fail, return 0 in this case --> time-out */
u8 buf;
if (iic_tpm_read(TPM_STS(chip->vendor.locality), &buf, 1) < 0)
return 0;
else
return buf;
}
static void tpm_tis_i2c_ready(struct tpm_chip *chip)
{
int rc;
/* This causes the current command to be aborted */
u8 buf = TPM_STS_COMMAND_READY;
debug("%s\n", __func__);
rc = iic_tpm_write_long(TPM_STS(chip->vendor.locality), &buf, 1);
if (rc)
debug("%s: rc=%d\n", __func__, rc);
}
static ssize_t get_burstcount(struct tpm_chip *chip)
{
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->vendor.timeout_d;
do {
/* Note: STS is little endian */
addr = TPM_STS(chip->vendor.locality) + 1;
if (iic_tpm_read(addr, buf, 3) < 0)
burstcnt = 0;
else
burstcnt = (buf[2] << 16) + (buf[1] << 8) + buf[0];
if (burstcnt)
return burstcnt;
udelay(TPM_TIMEOUT * 1000);
} while (get_timer(start) < stop);
return -EBUSY;
}
static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
int *status)
{
unsigned long start, stop;
/* Check current status */
*status = tpm_tis_i2c_status(chip);
if ((*status & mask) == mask)
return 0;
start = get_timer(0);
stop = timeout;
do {
udelay(TPM_TIMEOUT * 1000);
*status = tpm_tis_i2c_status(chip);
if ((*status & mask) == mask)
return 0;
} while (get_timer(start) < stop);
return -ETIME;
}
static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
{
size_t size = 0;
ssize_t burstcnt;
int rc;
while (size < count) {
burstcnt = get_burstcount(chip);
/* burstcount < 0 -> tpm is busy */
if (burstcnt < 0)
return burstcnt;
/* Limit received data to max left */
if (burstcnt > (count - size))
burstcnt = count - size;
rc = iic_tpm_read(TPM_DATA_FIFO(chip->vendor.locality),
&(buf[size]), burstcnt);
if (rc == 0)
size += burstcnt;
}
return size;
}
static int tpm_tis_i2c_recv(struct tpm_chip *chip, u8 *buf, size_t count)
{
int size = 0;
int expected, status;
if (count < TPM_HEADER_SIZE) {
size = -EIO;
goto out;
}
/* Read first 10 bytes, including tag, paramsize, and result */
size = recv_data(chip, buf, TPM_HEADER_SIZE);
if (size < TPM_HEADER_SIZE) {
error("Unable to read header\n");
goto out;
}
expected = get_unaligned_be32(buf + TPM_RSP_SIZE_BYTE);
if ((size_t)expected > count) {
error("Error size=%x, expected=%x, count=%x\n", size, expected,
count);
size = -EIO;
goto out;
}
size += recv_data(chip, &buf[TPM_HEADER_SIZE],
expected - TPM_HEADER_SIZE);
if (size < expected) {
error("Unable to read remainder of result\n");
size = -ETIME;
goto out;
}
wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c, &status);
if (status & TPM_STS_DATA_AVAIL) { /* Retry? */
error("Error left over data\n");
size = -EIO;
goto out;
}
out:
tpm_tis_i2c_ready(chip);
/*
* The TPM needs some time to clean up here,
* so we sleep rather than keeping the bus busy
*/
udelay(2000);
release_locality(chip, chip->vendor.locality, 0);
return size;
}
static int tpm_tis_i2c_send(struct tpm_chip *chip, u8 *buf, size_t len)
{
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 (request_locality(chip, 0) < 0)
return -EBUSY;
status = tpm_tis_i2c_status(chip);
if ((status & TPM_STS_COMMAND_READY) == 0) {
tpm_tis_i2c_ready(chip);
if (wait_for_stat(chip, TPM_STS_COMMAND_READY,
chip->vendor.timeout_b, &status) < 0) {
rc = -ETIME;
goto out_err;
}
}
burstcnt = get_burstcount(chip);
/* 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)
burstcnt = CONFIG_TPM_TIS_I2C_BURST_LIMITATION;
#endif /* CONFIG_TPM_TIS_I2C_BURST_LIMITATION */
rc = iic_tpm_write(TPM_DATA_FIFO(chip->vendor.locality),
&(buf[count]), burstcnt);
if (rc == 0)
count += burstcnt;
else {
debug("%s: error\n", __func__);
if (retry++ > 10) {
rc = -EIO;
goto out_err;
}
rc = wait_for_stat(chip, TPM_STS_VALID,
chip->vendor.timeout_c, &status);
if (rc)
goto out_err;
if ((status & TPM_STS_DATA_EXPECT) == 0) {
rc = -EIO;
goto out_err;
}
}
}
/* Go and do it */
iic_tpm_write(TPM_STS(chip->vendor.locality), &sts, 1);
debug("done\n");
return len;
out_err:
debug("%s: out_err\n", __func__);
tpm_tis_i2c_ready(chip);
/*
* The TPM needs some time to clean up here,
* so we sleep rather than keeping the bus busy
*/
udelay(2000);
release_locality(chip, chip->vendor.locality, 0);
return rc;
}
static struct tpm_vendor_specific tpm_tis_i2c = {
.status = tpm_tis_i2c_status,
.recv = tpm_tis_i2c_recv,
.send = tpm_tis_i2c_send,
.cancel = tpm_tis_i2c_ready,
.req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
.req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
.req_canceled = TPM_STS_COMMAND_READY,
};
static enum i2c_chip_type tpm_vendor_chip_type(void)
{
#if CONFIG_IS_ENABLED(OF_CONTROL)
const void *blob = gd->fdt_blob;
if (fdtdec_next_compatible(blob, 0, COMPAT_INFINEON_SLB9645_TPM) >= 0)
return SLB9645;
if (fdtdec_next_compatible(blob, 0, COMPAT_INFINEON_SLB9635_TPM) >= 0)
return SLB9635;
#endif
return UNKNOWN;
}
int tpm_vendor_init(struct udevice *dev)
{
struct tpm_chip *chip;
u32 vendor;
u32 expected_did_vid;
tpm_dev.dev = dev;
tpm_dev.chip_type = tpm_vendor_chip_type();
chip = tpm_register_hardware(&tpm_tis_i2c);
if (chip < 0)
return -ENODEV;
/* Disable interrupts (not supported) */
chip->vendor.irq = 0;
/* Default timeouts */
chip->vendor.timeout_a = TIS_SHORT_TIMEOUT;
chip->vendor.timeout_b = TIS_LONG_TIMEOUT;
chip->vendor.timeout_c = TIS_SHORT_TIMEOUT;
chip->vendor.timeout_d = TIS_SHORT_TIMEOUT;
if (request_locality(chip, 0) < 0)
return -ENODEV;
/* Read four bytes from DID_VID register */
if (iic_tpm_read(TPM_DID_VID(0), (uchar *)&vendor, 4) < 0) {
release_locality(chip, 0, 1);
return -EIO;
}
if (tpm_dev.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 (tpm_dev.chip_type != UNKNOWN && vendor != expected_did_vid) {
error("Vendor id did not match! ID was %08x\n", vendor);
return -ENODEV;
}
debug("1.2 TPM (chip type %s device-id 0x%X)\n",
chip_name[tpm_dev.chip_type], vendor >> 16);
/*
* A timeout query to TPM can be placed here.
* Standard timeout values are used so far
*/
return 0;
}
void tpm_vendor_cleanup(struct tpm_chip *chip)
{
release_locality(chip, chip->vendor.locality, 1);
}
/* Returns max number of milliseconds to wait */
static unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
u32 ordinal)
{
int duration_idx = TPM_UNDEFINED;
int duration = 0;
if (ordinal < TPM_MAX_ORDINAL) {
duration_idx = tpm_ordinal_duration[ordinal];
} else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
TPM_MAX_PROTECTED_ORDINAL) {
duration_idx = tpm_protected_ordinal_duration[
ordinal & TPM_PROTECTED_ORDINAL_MASK];
}
if (duration_idx != TPM_UNDEFINED)
duration = chip->vendor.duration[duration_idx];
if (duration <= 0)
return 2 * 60 * HZ; /* Two minutes timeout */
else
return duration;
}
static ssize_t tpm_transmit(const unsigned char *buf, size_t bufsiz)
{
int rc;
u32 count, ordinal;
unsigned long start, stop;
struct tpm_chip *chip = &g_chip;
/* switch endianess: big->little */
count = get_unaligned_be32(buf + TPM_CMD_COUNT_BYTE);
ordinal = get_unaligned_be32(buf + TPM_CMD_ORDINAL_BYTE);
if (count == 0) {
error("no data\n");
return -ENODATA;
}
if (count > bufsiz) {
error("invalid count value %x %zx\n", count, bufsiz);
return -E2BIG;
}
debug("Calling send\n");
rc = chip->vendor.send(chip, (u8 *)buf, count);
debug(" ... done calling send\n");
if (rc < 0) {
error("tpm_transmit: tpm_send: error %d\n", rc);
goto out;
}
if (chip->vendor.irq)
goto out_recv;
start = get_timer(0);
stop = tpm_calc_ordinal_duration(chip, ordinal);
do {
debug("waiting for status... %ld %ld\n", start, stop);
u8 status = chip->vendor.status(chip);
if ((status & chip->vendor.req_complete_mask) ==
chip->vendor.req_complete_val) {
debug("...got it;\n");
goto out_recv;
}
if (status == chip->vendor.req_canceled) {
error("Operation Canceled\n");
rc = -ECANCELED;
goto out;
}
udelay(TPM_TIMEOUT * 1000);
} while (get_timer(start) < stop);
chip->vendor.cancel(chip);
error("Operation Timed out\n");
rc = -ETIME;
goto out;
out_recv:
debug("out_recv: reading response...\n");
rc = chip->vendor.recv(chip, (u8 *)buf, TPM_BUFSIZE);
if (rc < 0)
error("tpm_transmit: tpm_recv: error %d\n", rc);
out:
return rc;
}
static int tpm_open_dev(struct udevice *dev)
{
int rc;
debug("%s: start\n", __func__);
if (g_chip.is_open)
return -EBUSY;
rc = tpm_vendor_init(dev);
if (rc < 0)
g_chip.is_open = 0;
return rc;
}
static void tpm_close(void)
{
if (g_chip.is_open) {
tpm_vendor_cleanup(&g_chip);
g_chip.is_open = 0;
}
}
/**
* Decode TPM configuration.
*
* @param dev Returns a configuration of TPM device
* @return 0 if ok, -1 on error
*/
static int tpm_decode_config(struct tpm *dev)
{
const void *blob = gd->fdt_blob;
struct udevice *bus;
int chip_addr;
int parent;
int node;
int ret;
node = fdtdec_next_compatible(blob, 0, COMPAT_INFINEON_SLB9635_TPM);
if (node < 0) {
node = fdtdec_next_compatible(blob, 0,
COMPAT_INFINEON_SLB9645_TPM);
}
if (node < 0) {
debug("%s: Node not found\n", __func__);
return -1;
}
parent = fdt_parent_offset(blob, node);
if (parent < 0) {
debug("%s: Cannot find node parent\n", __func__);
return -1;
}
/*
* TODO(sjg@chromium.org): Remove this when driver model supports
* TPMs
*/
ret = uclass_get_device_by_of_offset(UCLASS_I2C, parent, &bus);
if (ret) {
debug("Cannot find bus for node '%s: ret=%d'\n",
fdt_get_name(blob, parent, NULL), ret);
return ret;
}
chip_addr = fdtdec_get_int(blob, node, "reg", -1);
if (chip_addr == -1) {
debug("Cannot find reg property for node '%s: ret=%d'\n",
fdt_get_name(blob, node, NULL), ret);
return ret;
}
/*
* TODO(sjg@chromium.org): Older TPMs will need to use the older method
* in iic_tpm_read() so the offset length needs to be 0 here.
*/
ret = i2c_get_chip(bus, chip_addr, 1, &dev->dev);
if (ret) {
debug("Cannot find device for node '%s: ret=%d'\n",
fdt_get_name(blob, node, NULL), ret);
return ret;
}
return 0;
}
struct tpm_chip *tpm_register_hardware(const struct tpm_vendor_specific *entry)
{
struct tpm_chip *chip;
/* Driver specific per-device data */
chip = &g_chip;
memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
chip->is_open = 1;
return chip;
}
int tis_init(void)
{
if (tpm.inited)
return 0;
if (tpm_decode_config(&tpm))
return -1;
debug("%s: done\n", __func__);
tpm.inited = 1;
return 0;
}
int tis_open(void)
{
int rc;
if (!tpm.inited)
return -1;
rc = tpm_open_dev(tpm.dev);
return rc;
}
int tis_close(void)
{
if (!tpm.inited)
return -1;
tpm_close();
return 0;
}
int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size,
uint8_t *recvbuf, size_t *rbuf_len)
{
int len;
uint8_t buf[4096];
if (!tpm.inited)
return -1;
if (sizeof(buf) < sbuf_size)
return -1;
memcpy(buf, sendbuf, sbuf_size);
len = tpm_transmit(buf, sbuf_size);
if (len < 10) {
*rbuf_len = 0;
return -1;
}
memcpy(recvbuf, buf, len);
*rbuf_len = len;
return 0;
}