![Jeremy Boone](/assets/img/avatar_default.png)
Discrete TPMs are often connected over slow serial buses which, on some platforms, can have glitches causing bit flips. In all the driver _recv() functions, we need to use a u32 to unmarshal the response size, otherwise a bit flip of the 31st bit would cause the expected variable to go negative, which would then try to read a huge amount of data. Also sanity check that the expected amount of data is large enough for the TPM header. Signed-off-by: Jeremy Boone <jeremy.boone@nccgroup.trust> Cc: stable@vger.kernel.org Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: James Morris <james.morris@microsoft.com>
741 lines
18 KiB
C
741 lines
18 KiB
C
/*
|
|
* Copyright (C) 2012,2013 Infineon Technologies
|
|
*
|
|
* Authors:
|
|
* Peter Huewe <peter.huewe@infineon.com>
|
|
*
|
|
* 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 original tpm_tis device driver from Leendert van
|
|
* Dorn and Kyleen Hall.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation, version 2 of the
|
|
* License.
|
|
*
|
|
*
|
|
*/
|
|
#include <linux/i2c.h>
|
|
#include <linux/module.h>
|
|
#include <linux/wait.h>
|
|
#include "tpm.h"
|
|
|
|
/* max. buffer size supported by our TPM */
|
|
#define TPM_BUFSIZE 1260
|
|
|
|
/* max. number of iterations after I2C NAK */
|
|
#define MAX_COUNT 3
|
|
|
|
#define SLEEP_DURATION_LOW 55
|
|
#define SLEEP_DURATION_HI 65
|
|
|
|
/* 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_LONG_LOW 200
|
|
#define SLEEP_DURATION_LONG_HI 220
|
|
|
|
/* After sending TPM_READY to 'reset' the TPM we have to sleep even longer */
|
|
#define SLEEP_DURATION_RESET_LOW 2400
|
|
#define SLEEP_DURATION_RESET_HI 2600
|
|
|
|
/* we want to use usleep_range instead of msleep for the 5ms TPM_TIMEOUT */
|
|
#define TPM_TIMEOUT_US_LOW (TPM_TIMEOUT * 1000)
|
|
#define TPM_TIMEOUT_US_HI (TPM_TIMEOUT_US_LOW + 2000)
|
|
|
|
/* expected value for DIDVID register */
|
|
#define TPM_TIS_I2C_DID_VID_9635 0xd1150b00L
|
|
#define TPM_TIS_I2C_DID_VID_9645 0x001a15d1L
|
|
|
|
enum i2c_chip_type {
|
|
SLB9635,
|
|
SLB9645,
|
|
UNKNOWN,
|
|
};
|
|
|
|
/* Structure to store I2C TPM specific stuff */
|
|
struct tpm_inf_dev {
|
|
struct i2c_client *client;
|
|
int locality;
|
|
u8 buf[TPM_BUFSIZE + sizeof(u8)]; /* max. buffer size + addr */
|
|
struct tpm_chip *chip;
|
|
enum i2c_chip_type chip_type;
|
|
unsigned int adapterlimit;
|
|
};
|
|
|
|
static struct tpm_inf_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.
|
|
*
|
|
* NOTE: We can't unfortunately use the combined read/write functions
|
|
* provided by the i2c core as the TPM currently does not support the
|
|
* repeated start condition and due to it's special requirements.
|
|
* The i2c_smbus* functions do not work for this chip.
|
|
*
|
|
* Return -EIO on error, 0 on success.
|
|
*/
|
|
static int iic_tpm_read(u8 addr, u8 *buffer, size_t len)
|
|
{
|
|
|
|
struct i2c_msg msg1 = {
|
|
.addr = tpm_dev.client->addr,
|
|
.len = 1,
|
|
.buf = &addr
|
|
};
|
|
struct i2c_msg msg2 = {
|
|
.addr = tpm_dev.client->addr,
|
|
.flags = I2C_M_RD,
|
|
.len = len,
|
|
.buf = buffer
|
|
};
|
|
struct i2c_msg msgs[] = {msg1, msg2};
|
|
|
|
int rc = 0;
|
|
int count;
|
|
unsigned int msglen = len;
|
|
|
|
/* Lock the adapter for the duration of the whole sequence. */
|
|
if (!tpm_dev.client->adapter->algo->master_xfer)
|
|
return -EOPNOTSUPP;
|
|
i2c_lock_adapter(tpm_dev.client->adapter);
|
|
|
|
if (tpm_dev.chip_type == SLB9645) {
|
|
/* 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 on the safe side.
|
|
*/
|
|
for (count = 0; count < MAX_COUNT; count++) {
|
|
rc = __i2c_transfer(tpm_dev.client->adapter, msgs, 2);
|
|
if (rc > 0)
|
|
break; /* break here to skip sleep */
|
|
usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
|
|
}
|
|
} else {
|
|
/* Expect to send one command message and one data message, but
|
|
* support looping over each or both if necessary.
|
|
*/
|
|
while (len > 0) {
|
|
/* slb9635 protocol should work in all cases */
|
|
for (count = 0; count < MAX_COUNT; count++) {
|
|
rc = __i2c_transfer(tpm_dev.client->adapter,
|
|
&msg1, 1);
|
|
if (rc > 0)
|
|
break; /* break here to skip sleep */
|
|
|
|
usleep_range(SLEEP_DURATION_LOW,
|
|
SLEEP_DURATION_HI);
|
|
}
|
|
|
|
if (rc <= 0)
|
|
goto out;
|
|
|
|
/* 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++) {
|
|
if (tpm_dev.adapterlimit) {
|
|
msglen = min_t(unsigned int,
|
|
tpm_dev.adapterlimit,
|
|
len);
|
|
msg2.len = msglen;
|
|
}
|
|
usleep_range(SLEEP_DURATION_LOW,
|
|
SLEEP_DURATION_HI);
|
|
rc = __i2c_transfer(tpm_dev.client->adapter,
|
|
&msg2, 1);
|
|
if (rc > 0) {
|
|
/* Since len is unsigned, make doubly
|
|
* sure we do not underflow it.
|
|
*/
|
|
if (msglen > len)
|
|
len = 0;
|
|
else
|
|
len -= msglen;
|
|
msg2.buf += msglen;
|
|
break;
|
|
}
|
|
/* If the I2C adapter rejected the request (e.g
|
|
* when the quirk read_max_len < len) fall back
|
|
* to a sane minimum value and try again.
|
|
*/
|
|
if (rc == -EOPNOTSUPP)
|
|
tpm_dev.adapterlimit =
|
|
I2C_SMBUS_BLOCK_MAX;
|
|
}
|
|
|
|
if (rc <= 0)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
i2c_unlock_adapter(tpm_dev.client->adapter);
|
|
/* take care of 'guard time' */
|
|
usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
|
|
|
|
/* __i2c_transfer returns the number of successfully transferred
|
|
* messages.
|
|
* So rc should be greater than 0 here otherwise we have an error.
|
|
*/
|
|
if (rc <= 0)
|
|
return -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iic_tpm_write_generic(u8 addr, u8 *buffer, size_t len,
|
|
unsigned int sleep_low,
|
|
unsigned int sleep_hi, u8 max_count)
|
|
{
|
|
int rc = -EIO;
|
|
int count;
|
|
|
|
struct i2c_msg msg1 = {
|
|
.addr = tpm_dev.client->addr,
|
|
.len = len + 1,
|
|
.buf = tpm_dev.buf
|
|
};
|
|
|
|
if (len > TPM_BUFSIZE)
|
|
return -EINVAL;
|
|
|
|
if (!tpm_dev.client->adapter->algo->master_xfer)
|
|
return -EOPNOTSUPP;
|
|
i2c_lock_adapter(tpm_dev.client->adapter);
|
|
|
|
/* prepend the 'register address' to the buffer */
|
|
tpm_dev.buf[0] = addr;
|
|
memcpy(&(tpm_dev.buf[1]), buffer, len);
|
|
|
|
/*
|
|
* NOTE: We have to use these special mechanisms here and unfortunately
|
|
* cannot rely on the standard behavior of i2c_transfer.
|
|
* Even for newer chips the smbus functions are not
|
|
* suitable due to the 32 byte limit of the smbus.
|
|
*/
|
|
for (count = 0; count < max_count; count++) {
|
|
rc = __i2c_transfer(tpm_dev.client->adapter, &msg1, 1);
|
|
if (rc > 0)
|
|
break;
|
|
usleep_range(sleep_low, sleep_hi);
|
|
}
|
|
|
|
i2c_unlock_adapter(tpm_dev.client->adapter);
|
|
/* take care of 'guard time' */
|
|
usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
|
|
|
|
/* __i2c_transfer returns the number of successfully transferred
|
|
* messages.
|
|
* So rc should be greater than 0 here otherwise we have an error.
|
|
*/
|
|
if (rc <= 0)
|
|
return -EIO;
|
|
|
|
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_LOW,
|
|
SLEEP_DURATION_HI, 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_LOW,
|
|
SLEEP_DURATION_LONG_HI, MAX_COUNT_LONG);
|
|
}
|
|
|
|
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, /* 2 sec */
|
|
};
|
|
|
|
#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))
|
|
|
|
static bool check_locality(struct tpm_chip *chip, int loc)
|
|
{
|
|
u8 buf;
|
|
int rc;
|
|
|
|
rc = iic_tpm_read(TPM_ACCESS(loc), &buf, 1);
|
|
if (rc < 0)
|
|
return false;
|
|
|
|
if ((buf & (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
|
|
(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) {
|
|
tpm_dev.locality = loc;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/* implementation similar to tpm_tis */
|
|
static void release_locality(struct tpm_chip *chip, int loc, int force)
|
|
{
|
|
u8 buf;
|
|
if (iic_tpm_read(TPM_ACCESS(loc), &buf, 1) < 0)
|
|
return;
|
|
|
|
if (force || (buf & (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) ==
|
|
(TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) {
|
|
buf = TPM_ACCESS_ACTIVE_LOCALITY;
|
|
iic_tpm_write(TPM_ACCESS(loc), &buf, 1);
|
|
}
|
|
}
|
|
|
|
static int request_locality(struct tpm_chip *chip, int loc)
|
|
{
|
|
unsigned long stop;
|
|
u8 buf = TPM_ACCESS_REQUEST_USE;
|
|
|
|
if (check_locality(chip, loc))
|
|
return loc;
|
|
|
|
iic_tpm_write(TPM_ACCESS(loc), &buf, 1);
|
|
|
|
/* wait for burstcount */
|
|
stop = jiffies + chip->timeout_a;
|
|
do {
|
|
if (check_locality(chip, loc))
|
|
return loc;
|
|
usleep_range(TPM_TIMEOUT_US_LOW, TPM_TIMEOUT_US_HI);
|
|
} while (time_before(jiffies, stop));
|
|
|
|
return -ETIME;
|
|
}
|
|
|
|
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 = 0xFF;
|
|
u8 i = 0;
|
|
|
|
do {
|
|
if (iic_tpm_read(TPM_STS(tpm_dev.locality), &buf, 1) < 0)
|
|
return 0;
|
|
|
|
i++;
|
|
/* if locallity is set STS should not be 0xFF */
|
|
} while ((buf == 0xFF) && i < 10);
|
|
|
|
return buf;
|
|
}
|
|
|
|
static void tpm_tis_i2c_ready(struct tpm_chip *chip)
|
|
{
|
|
/* this causes the current command to be aborted */
|
|
u8 buf = TPM_STS_COMMAND_READY;
|
|
iic_tpm_write_long(TPM_STS(tpm_dev.locality), &buf, 1);
|
|
}
|
|
|
|
static ssize_t get_burstcount(struct tpm_chip *chip)
|
|
{
|
|
unsigned long stop;
|
|
ssize_t burstcnt;
|
|
u8 buf[3];
|
|
|
|
/* wait for burstcount */
|
|
/* which timeout value, spec has 2 answers (c & d) */
|
|
stop = jiffies + chip->timeout_d;
|
|
do {
|
|
/* Note: STS is little endian */
|
|
if (iic_tpm_read(TPM_STS(tpm_dev.locality)+1, buf, 3) < 0)
|
|
burstcnt = 0;
|
|
else
|
|
burstcnt = (buf[2] << 16) + (buf[1] << 8) + buf[0];
|
|
|
|
if (burstcnt)
|
|
return burstcnt;
|
|
|
|
usleep_range(TPM_TIMEOUT_US_LOW, TPM_TIMEOUT_US_HI);
|
|
} while (time_before(jiffies, stop));
|
|
return -EBUSY;
|
|
}
|
|
|
|
static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
|
|
int *status)
|
|
{
|
|
unsigned long stop;
|
|
|
|
/* check current status */
|
|
*status = tpm_tis_i2c_status(chip);
|
|
if ((*status != 0xFF) && (*status & mask) == mask)
|
|
return 0;
|
|
|
|
stop = jiffies + timeout;
|
|
do {
|
|
/* since we just checked the status, give the TPM some time */
|
|
usleep_range(TPM_TIMEOUT_US_LOW, TPM_TIMEOUT_US_HI);
|
|
*status = tpm_tis_i2c_status(chip);
|
|
if ((*status & mask) == mask)
|
|
return 0;
|
|
|
|
} while (time_before(jiffies, stop));
|
|
|
|
return -ETIME;
|
|
}
|
|
|
|
static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
|
|
{
|
|
size_t size = 0;
|
|
ssize_t burstcnt;
|
|
u8 retries = 0;
|
|
int rc;
|
|
|
|
while (size < count) {
|
|
burstcnt = get_burstcount(chip);
|
|
|
|
/* burstcnt < 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(tpm_dev.locality),
|
|
&(buf[size]), burstcnt);
|
|
if (rc == 0)
|
|
size += burstcnt;
|
|
else if (rc < 0)
|
|
retries++;
|
|
|
|
/* avoid endless loop in case of broken HW */
|
|
if (retries > MAX_COUNT_LONG)
|
|
return -EIO;
|
|
}
|
|
return size;
|
|
}
|
|
|
|
static int tpm_tis_i2c_recv(struct tpm_chip *chip, u8 *buf, size_t count)
|
|
{
|
|
int size = 0;
|
|
int status;
|
|
u32 expected;
|
|
|
|
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) {
|
|
dev_err(&chip->dev, "Unable to read header\n");
|
|
goto out;
|
|
}
|
|
|
|
expected = be32_to_cpu(*(__be32 *)(buf + 2));
|
|
if (((size_t) expected > count) || (expected < TPM_HEADER_SIZE)) {
|
|
size = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
size += recv_data(chip, &buf[TPM_HEADER_SIZE],
|
|
expected - TPM_HEADER_SIZE);
|
|
if (size < expected) {
|
|
dev_err(&chip->dev, "Unable to read remainder of result\n");
|
|
size = -ETIME;
|
|
goto out;
|
|
}
|
|
|
|
wait_for_stat(chip, TPM_STS_VALID, chip->timeout_c, &status);
|
|
if (status & TPM_STS_DATA_AVAIL) { /* retry? */
|
|
dev_err(&chip->dev, "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
|
|
*/
|
|
usleep_range(SLEEP_DURATION_RESET_LOW, SLEEP_DURATION_RESET_HI);
|
|
release_locality(chip, tpm_dev.locality, 0);
|
|
return size;
|
|
}
|
|
|
|
static int tpm_tis_i2c_send(struct tpm_chip *chip, u8 *buf, size_t len)
|
|
{
|
|
int rc, status;
|
|
ssize_t burstcnt;
|
|
size_t count = 0;
|
|
u8 retries = 0;
|
|
u8 sts = TPM_STS_GO;
|
|
|
|
if (len > TPM_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->timeout_b, &status) < 0) {
|
|
rc = -ETIME;
|
|
goto out_err;
|
|
}
|
|
}
|
|
|
|
while (count < len - 1) {
|
|
burstcnt = get_burstcount(chip);
|
|
|
|
/* burstcnt < 0 = TPM is busy */
|
|
if (burstcnt < 0)
|
|
return burstcnt;
|
|
|
|
if (burstcnt > (len - 1 - count))
|
|
burstcnt = len - 1 - count;
|
|
|
|
rc = iic_tpm_write(TPM_DATA_FIFO(tpm_dev.locality),
|
|
&(buf[count]), burstcnt);
|
|
if (rc == 0)
|
|
count += burstcnt;
|
|
else if (rc < 0)
|
|
retries++;
|
|
|
|
/* avoid endless loop in case of broken HW */
|
|
if (retries > MAX_COUNT_LONG) {
|
|
rc = -EIO;
|
|
goto out_err;
|
|
}
|
|
|
|
wait_for_stat(chip, TPM_STS_VALID,
|
|
chip->timeout_c, &status);
|
|
|
|
if ((status & TPM_STS_DATA_EXPECT) == 0) {
|
|
rc = -EIO;
|
|
goto out_err;
|
|
}
|
|
}
|
|
|
|
/* write last byte */
|
|
iic_tpm_write(TPM_DATA_FIFO(tpm_dev.locality), &(buf[count]), 1);
|
|
wait_for_stat(chip, TPM_STS_VALID, chip->timeout_c, &status);
|
|
if ((status & TPM_STS_DATA_EXPECT) != 0) {
|
|
rc = -EIO;
|
|
goto out_err;
|
|
}
|
|
|
|
/* go and do it */
|
|
iic_tpm_write(TPM_STS(tpm_dev.locality), &sts, 1);
|
|
|
|
return len;
|
|
out_err:
|
|
tpm_tis_i2c_ready(chip);
|
|
/* The TPM needs some time to clean up here,
|
|
* so we sleep rather than keeping the bus busy
|
|
*/
|
|
usleep_range(SLEEP_DURATION_RESET_LOW, SLEEP_DURATION_RESET_HI);
|
|
release_locality(chip, tpm_dev.locality, 0);
|
|
return rc;
|
|
}
|
|
|
|
static bool tpm_tis_i2c_req_canceled(struct tpm_chip *chip, u8 status)
|
|
{
|
|
return (status == TPM_STS_COMMAND_READY);
|
|
}
|
|
|
|
static const struct tpm_class_ops tpm_tis_i2c = {
|
|
.flags = TPM_OPS_AUTO_STARTUP,
|
|
.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_tis_i2c_req_canceled,
|
|
};
|
|
|
|
static int tpm_tis_i2c_init(struct device *dev)
|
|
{
|
|
u32 vendor;
|
|
int rc = 0;
|
|
struct tpm_chip *chip;
|
|
|
|
chip = tpmm_chip_alloc(dev, &tpm_tis_i2c);
|
|
if (IS_ERR(chip))
|
|
return PTR_ERR(chip);
|
|
|
|
/* Default timeouts */
|
|
chip->timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
|
|
chip->timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
|
|
chip->timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
|
|
chip->timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
|
|
|
|
if (request_locality(chip, 0) != 0) {
|
|
dev_err(dev, "could not request locality\n");
|
|
rc = -ENODEV;
|
|
goto out_err;
|
|
}
|
|
|
|
/* read four bytes from DID_VID register */
|
|
if (iic_tpm_read(TPM_DID_VID(0), (u8 *)&vendor, 4) < 0) {
|
|
dev_err(dev, "could not read vendor id\n");
|
|
rc = -EIO;
|
|
goto out_release;
|
|
}
|
|
|
|
if (vendor == TPM_TIS_I2C_DID_VID_9645) {
|
|
tpm_dev.chip_type = SLB9645;
|
|
} else if (vendor == TPM_TIS_I2C_DID_VID_9635) {
|
|
tpm_dev.chip_type = SLB9635;
|
|
} else {
|
|
dev_err(dev, "vendor id did not match! ID was %08x\n", vendor);
|
|
rc = -ENODEV;
|
|
goto out_release;
|
|
}
|
|
|
|
dev_info(dev, "1.2 TPM (device-id 0x%X)\n", vendor >> 16);
|
|
|
|
tpm_dev.chip = chip;
|
|
|
|
return tpm_chip_register(chip);
|
|
out_release:
|
|
release_locality(chip, tpm_dev.locality, 1);
|
|
tpm_dev.client = NULL;
|
|
out_err:
|
|
return rc;
|
|
}
|
|
|
|
static const struct i2c_device_id tpm_tis_i2c_table[] = {
|
|
{"tpm_i2c_infineon"},
|
|
{"slb9635tt"},
|
|
{"slb9645tt"},
|
|
{},
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, tpm_tis_i2c_table);
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id tpm_tis_i2c_of_match[] = {
|
|
{.compatible = "infineon,tpm_i2c_infineon"},
|
|
{.compatible = "infineon,slb9635tt"},
|
|
{.compatible = "infineon,slb9645tt"},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, tpm_tis_i2c_of_match);
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(tpm_tis_i2c_ops, tpm_pm_suspend, tpm_pm_resume);
|
|
|
|
static int tpm_tis_i2c_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
int rc;
|
|
struct device *dev = &(client->dev);
|
|
|
|
if (tpm_dev.client != NULL) {
|
|
dev_err(dev, "This driver only supports one client at a time\n");
|
|
return -EBUSY; /* We only support one client */
|
|
}
|
|
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
|
|
dev_err(dev, "no algorithms associated to the i2c bus\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
tpm_dev.client = client;
|
|
rc = tpm_tis_i2c_init(&client->dev);
|
|
if (rc != 0) {
|
|
tpm_dev.client = NULL;
|
|
rc = -ENODEV;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static int tpm_tis_i2c_remove(struct i2c_client *client)
|
|
{
|
|
struct tpm_chip *chip = tpm_dev.chip;
|
|
|
|
tpm_chip_unregister(chip);
|
|
release_locality(chip, tpm_dev.locality, 1);
|
|
tpm_dev.client = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct i2c_driver tpm_tis_i2c_driver = {
|
|
.id_table = tpm_tis_i2c_table,
|
|
.probe = tpm_tis_i2c_probe,
|
|
.remove = tpm_tis_i2c_remove,
|
|
.driver = {
|
|
.name = "tpm_i2c_infineon",
|
|
.pm = &tpm_tis_i2c_ops,
|
|
.of_match_table = of_match_ptr(tpm_tis_i2c_of_match),
|
|
},
|
|
};
|
|
|
|
module_i2c_driver(tpm_tis_i2c_driver);
|
|
MODULE_AUTHOR("Peter Huewe <peter.huewe@infineon.com>");
|
|
MODULE_DESCRIPTION("TPM TIS I2C Infineon Driver");
|
|
MODULE_VERSION("2.2.0");
|
|
MODULE_LICENSE("GPL");
|