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-rw-r--r--drivers/tpm/tpm_tis_i2c.c113
1 files changed, 58 insertions, 55 deletions
diff --git a/drivers/tpm/tpm_tis_i2c.c b/drivers/tpm/tpm_tis_i2c.c
index 9dd40dd..e04e8f5 100644
--- a/drivers/tpm/tpm_tis_i2c.c
+++ b/drivers/tpm/tpm_tis_i2c.c
@@ -43,7 +43,7 @@ static const char * const chip_name[] = {
static struct tpm_chip g_chip;
/*
- * iic_tpm_read() - read from TPM register
+ * tpm_tis_i2c_read() - read from TPM register
* @addr: register address to read from
* @buffer: provided by caller
* @len: number of bytes to read
@@ -56,7 +56,7 @@ static struct tpm_chip g_chip;
*
* Return -EIO on error, 0 on success.
*/
-static int iic_tpm_read(u8 addr, u8 *buffer, size_t len)
+static int tpm_tis_i2c_read(u8 addr, u8 *buffer, size_t len)
{
int rc;
int count;
@@ -107,8 +107,8 @@ static int iic_tpm_read(u8 addr, u8 *buffer, size_t len)
return 0;
}
-static int iic_tpm_write_generic(u8 addr, u8 *buffer, size_t len,
- unsigned int sleep_time, u8 max_count)
+static int tpm_tis_i2c_write_generic(u8 addr, u8 *buffer, size_t len,
+ unsigned int sleep_time, u8 max_count)
{
int rc = 0;
int count;
@@ -129,7 +129,7 @@ static int iic_tpm_write_generic(u8 addr, u8 *buffer, size_t len,
}
/*
- * iic_tpm_write() - write to TPM register
+ * 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
@@ -140,13 +140,13 @@ static int iic_tpm_write_generic(u8 addr, u8 *buffer, size_t len,
* 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.
+ * NOTE: use this function instead of the tpm_tis_i2c_write_generic function.
*
* Return -EIO on error, 0 on success
*/
-static int iic_tpm_write(u8 addr, u8 *buffer, size_t len)
+static int tpm_tis_i2c_write(u8 addr, u8 *buffer, size_t len)
{
- return iic_tpm_write_generic(addr, buffer, len, SLEEP_DURATION,
+ return tpm_tis_i2c_write_generic(addr, buffer, len, SLEEP_DURATION,
MAX_COUNT);
}
@@ -154,19 +154,19 @@ static int iic_tpm_write(u8 addr, u8 *buffer, size_t len)
* 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)
+static int tpm_tis_i2c_write_long(u8 addr, u8 *buffer, size_t len)
{
- return iic_tpm_write_generic(addr, buffer, len, SLEEP_DURATION_LONG,
+ return tpm_tis_i2c_write_generic(addr, buffer, len, SLEEP_DURATION_LONG,
MAX_COUNT_LONG);
}
-static int check_locality(struct tpm_chip *chip, int loc)
+static int tpm_tis_i2c_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);
+ rc = tpm_tis_i2c_read(TPM_ACCESS(loc), &buf, 1);
if (rc < 0)
return rc;
@@ -178,30 +178,31 @@ static int check_locality(struct tpm_chip *chip, int loc)
return -1;
}
-static void release_locality(struct tpm_chip *chip, int loc, int force)
+static void tpm_tis_i2c_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)
+ if (tpm_tis_i2c_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);
+ tpm_tis_i2c_write(TPM_ACCESS(loc), &buf, 1);
}
}
-static int request_locality(struct tpm_chip *chip, int loc)
+static int tpm_tis_i2c_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)
+ if (tpm_tis_i2c_check_locality(chip, loc) >= 0)
return loc; /* We already have the locality */
- rc = iic_tpm_write(TPM_ACCESS(loc), &buf, 1);
+ rc = tpm_tis_i2c_write(TPM_ACCESS(loc), &buf, 1);
if (rc)
return rc;
@@ -209,7 +210,7 @@ static int request_locality(struct tpm_chip *chip, int loc)
start = get_timer(0);
stop = chip->timeout_a;
do {
- if (check_locality(chip, loc) >= 0)
+ if (tpm_tis_i2c_check_locality(chip, loc) >= 0)
return loc;
udelay(TPM_TIMEOUT * 1000);
} while (get_timer(start) < stop);
@@ -222,7 +223,7 @@ 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->locality), &buf, 1) < 0)
+ if (tpm_tis_i2c_read(TPM_STS(chip->locality), &buf, 1) < 0)
return 0;
else
return buf;
@@ -236,12 +237,12 @@ static void tpm_tis_i2c_ready(struct tpm_chip *chip)
u8 buf = TPM_STS_COMMAND_READY;
debug("%s\n", __func__);
- rc = iic_tpm_write_long(TPM_STS(chip->locality), &buf, 1);
+ rc = tpm_tis_i2c_write_long(TPM_STS(chip->locality), &buf, 1);
if (rc)
debug("%s: rc=%d\n", __func__, rc);
}
-static ssize_t get_burstcount(struct tpm_chip *chip)
+static ssize_t tpm_tis_i2c_get_burstcount(struct tpm_chip *chip)
{
unsigned long start, stop;
ssize_t burstcnt;
@@ -254,7 +255,7 @@ static ssize_t get_burstcount(struct tpm_chip *chip)
do {
/* Note: STS is little endian */
addr = TPM_STS(chip->locality) + 1;
- if (iic_tpm_read(addr, buf, 3) < 0)
+ if (tpm_tis_i2c_read(addr, buf, 3) < 0)
burstcnt = 0;
else
burstcnt = (buf[2] << 16) + (buf[1] << 8) + buf[0];
@@ -267,8 +268,8 @@ static ssize_t get_burstcount(struct tpm_chip *chip)
return -EBUSY;
}
-static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
- int *status)
+static int tpm_tis_i2c_wait_for_stat(struct tpm_chip *chip, u8 mask,
+ unsigned long timeout, int *status)
{
unsigned long start, stop;
@@ -289,14 +290,14 @@ static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
return -ETIME;
}
-static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
+static int tpm_tis_i2c_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);
+ burstcnt = tpm_tis_i2c_get_burstcount(chip);
/* burstcount < 0 -> tpm is busy */
if (burstcnt < 0)
@@ -306,7 +307,7 @@ static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
if (burstcnt > (count - size))
burstcnt = count - size;
- rc = iic_tpm_read(TPM_DATA_FIFO(chip->locality),
+ rc = tpm_tis_i2c_read(TPM_DATA_FIFO(chip->locality),
&(buf[size]), burstcnt);
if (rc == 0)
size += burstcnt;
@@ -326,7 +327,7 @@ static int tpm_tis_i2c_recv(struct tpm_chip *chip, u8 *buf, size_t count)
}
/* Read first 10 bytes, including tag, paramsize, and result */
- size = recv_data(chip, buf, TPM_HEADER_SIZE);
+ size = tpm_tis_i2c_recv_data(chip, buf, TPM_HEADER_SIZE);
if (size < TPM_HEADER_SIZE) {
error("Unable to read header\n");
goto out;
@@ -340,15 +341,16 @@ static int tpm_tis_i2c_recv(struct tpm_chip *chip, u8 *buf, size_t count)
goto out;
}
- size += recv_data(chip, &buf[TPM_HEADER_SIZE],
- expected - TPM_HEADER_SIZE);
+ size += tpm_tis_i2c_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->timeout_c, &status);
+ tpm_tis_i2c_wait_for_stat(chip, TPM_STS_VALID, chip->timeout_c,
+ &status);
if (status & TPM_STS_DATA_AVAIL) { /* Retry? */
error("Error left over data\n");
size = -EIO;
@@ -362,7 +364,7 @@ out:
* so we sleep rather than keeping the bus busy
*/
udelay(2000);
- release_locality(chip, chip->locality, 0);
+ tpm_tis_i2c_release_locality(chip, chip->locality, 0);
return size;
}
@@ -379,20 +381,20 @@ static int tpm_tis_i2c_send(struct tpm_chip *chip, u8 *buf, size_t len)
if (len > TPM_DEV_BUFSIZE)
return -E2BIG; /* Command is too long for our tpm, sorry */
- if (request_locality(chip, 0) < 0)
+ if (tpm_tis_i2c_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) {
+ if (tpm_tis_i2c_wait_for_stat(chip, TPM_STS_COMMAND_READY,
+ chip->timeout_b, &status) < 0) {
rc = -ETIME;
goto out_err;
}
}
- burstcnt = get_burstcount(chip);
+ burstcnt = tpm_tis_i2c_get_burstcount(chip);
/* burstcount < 0 -> tpm is busy */
if (burstcnt < 0)
@@ -408,7 +410,7 @@ static int tpm_tis_i2c_send(struct tpm_chip *chip, u8 *buf, size_t len)
burstcnt = CONFIG_TPM_TIS_I2C_BURST_LIMITATION;
#endif /* CONFIG_TPM_TIS_I2C_BURST_LIMITATION */
- rc = iic_tpm_write(TPM_DATA_FIFO(chip->locality),
+ rc = tpm_tis_i2c_write(TPM_DATA_FIFO(chip->locality),
&(buf[count]), burstcnt);
if (rc == 0)
count += burstcnt;
@@ -418,8 +420,9 @@ static int tpm_tis_i2c_send(struct tpm_chip *chip, u8 *buf, size_t len)
rc = -EIO;
goto out_err;
}
- rc = wait_for_stat(chip, TPM_STS_VALID,
- chip->timeout_c, &status);
+ rc = tpm_tis_i2c_wait_for_stat(chip, TPM_STS_VALID,
+ chip->timeout_c,
+ &status);
if (rc)
goto out_err;
@@ -431,7 +434,7 @@ static int tpm_tis_i2c_send(struct tpm_chip *chip, u8 *buf, size_t len)
}
/* Go and do it */
- iic_tpm_write(TPM_STS(chip->locality), &sts, 1);
+ tpm_tis_i2c_write(TPM_STS(chip->locality), &sts, 1);
debug("done\n");
return len;
@@ -444,7 +447,7 @@ out_err:
* so we sleep rather than keeping the bus busy
*/
udelay(2000);
- release_locality(chip, chip->locality, 0);
+ tpm_tis_i2c_release_locality(chip, chip->locality, 0);
return rc;
}
@@ -476,7 +479,7 @@ static int tpm_tis_i2c_init(struct udevice *dev)
/* Disable interrupts (not supported) */
chip->irq = 0;
- /* Default timeouts */
+ /* Default timeouts - these could move to the device tree */
chip->timeout_a = TIS_SHORT_TIMEOUT;
chip->timeout_b = TIS_LONG_TIMEOUT;
chip->timeout_c = TIS_SHORT_TIMEOUT;
@@ -485,12 +488,12 @@ static int tpm_tis_i2c_init(struct udevice *dev)
chip->req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID;
chip->req_canceled = TPM_STS_COMMAND_READY;
- if (request_locality(chip, 0) < 0)
+ if (tpm_tis_i2c_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);
+ if (tpm_tis_i2c_read(TPM_DID_VID(0), (uchar *)&vendor, 4) < 0) {
+ tpm_tis_i2c_release_locality(chip, 0, 1);
return -EIO;
}
@@ -519,8 +522,8 @@ static int tpm_tis_i2c_init(struct udevice *dev)
}
/* Returns max number of milliseconds to wait */
-static unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
- u32 ordinal)
+static unsigned long tpm_tis_i2c_calc_ordinal_duration(struct tpm_chip *chip,
+ u32 ordinal)
{
int duration_idx = TPM_UNDEFINED;
int duration = 0;
@@ -542,7 +545,7 @@ static unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
return duration;
}
-static ssize_t tpm_transmit(const unsigned char *buf, size_t bufsiz)
+static ssize_t tpm_tis_i2c_transmit(const unsigned char *buf, size_t bufsiz)
{
int rc;
u32 count, ordinal;
@@ -575,7 +578,7 @@ static ssize_t tpm_transmit(const unsigned char *buf, size_t bufsiz)
goto out_recv;
start = get_timer(0);
- stop = tpm_calc_ordinal_duration(chip, ordinal);
+ stop = tpm_tis_i2c_calc_ordinal_duration(chip, ordinal);
do {
debug("waiting for status... %ld %ld\n", start, stop);
u8 status = tpm_tis_i2c_status(chip);
@@ -614,7 +617,7 @@ out:
* @param dev Returns a configuration of TPM device
* @return 0 if ok, -1 on error
*/
-static int tpm_decode_config(struct tpm_chip *chip)
+static int tpm_tis_i2c_decode_config(struct tpm_chip *chip)
{
const void *blob = gd->fdt_blob;
struct udevice *bus;
@@ -657,7 +660,7 @@ static int tpm_decode_config(struct tpm_chip *chip)
}
/*
* 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.
+ * in tpm_tis_i2c_read() so the offset length needs to be 0 here.
*/
ret = i2c_get_chip(bus, chip_addr, 1, &chip->dev);
if (ret) {
@@ -674,7 +677,7 @@ int tis_init(void)
if (g_chip.inited)
return 0;
- if (tpm_decode_config(&g_chip))
+ if (tpm_tis_i2c_decode_config(&g_chip))
return -1;
debug("%s: done\n", __func__);
@@ -707,7 +710,7 @@ int tis_close(void)
return -1;
if (g_chip.is_open) {
- release_locality(&g_chip, g_chip.locality, 1);
+ tpm_tis_i2c_release_locality(&g_chip, g_chip.locality, 1);
g_chip.is_open = 0;
}
@@ -728,7 +731,7 @@ int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size,
memcpy(buf, sendbuf, sbuf_size);
- len = tpm_transmit(buf, sbuf_size);
+ len = tpm_tis_i2c_transmit(buf, sbuf_size);
if (len < 10) {
*rbuf_len = 0;
generated by cgit v1.1 at 2024-11-29 01:28:59 +0000