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path: root/drivers/char/tpm/tpm_tis_i2c_cr50.c
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Diffstat (limited to 'drivers/char/tpm/tpm_tis_i2c_cr50.c')
-rw-r--r--drivers/char/tpm/tpm_tis_i2c_cr50.c146
1 files changed, 94 insertions, 52 deletions
diff --git a/drivers/char/tpm/tpm_tis_i2c_cr50.c b/drivers/char/tpm/tpm_tis_i2c_cr50.c
index adf22992138e..3b55a7b05c46 100644
--- a/drivers/char/tpm/tpm_tis_i2c_cr50.c
+++ b/drivers/char/tpm/tpm_tis_i2c_cr50.c
@@ -17,6 +17,7 @@
*/
#include <linux/acpi.h>
+#include <linux/bug.h>
#include <linux/completion.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
@@ -30,11 +31,13 @@
#define TPM_CR50_MAX_BUFSIZE 64
#define TPM_CR50_TIMEOUT_SHORT_MS 2 /* Short timeout during transactions */
#define TPM_CR50_TIMEOUT_NOIRQ_MS 20 /* Timeout for TPM ready without IRQ */
-#define TPM_CR50_I2C_DID_VID 0x00281ae0L /* Device and vendor ID reg value */
-#define TPM_TI50_I2C_DID_VID 0x504a6666L /* Device and vendor ID reg value */
+#define TPM_CR50_I2C_DID_VID 0x00281ae0L /* Device and vendor ID for Cr50 H1 */
+#define TPM_TI50_DT_I2C_DID_VID 0x504a6666L /* Device and vendor ID for Ti50 DT */
+#define TPM_TI50_OT_I2C_DID_VID 0x50666666L /* Device and vendor ID for TI50 OT */
#define TPM_CR50_I2C_MAX_RETRIES 3 /* Max retries due to I2C errors */
#define TPM_CR50_I2C_RETRY_DELAY_LO 55 /* Min usecs between retries on I2C */
#define TPM_CR50_I2C_RETRY_DELAY_HI 65 /* Max usecs between retries on I2C */
+#define TPM_CR50_I2C_DEFAULT_LOC 0
#define TPM_I2C_ACCESS(l) (0x0000 | ((l) << 4))
#define TPM_I2C_STS(l) (0x0001 | ((l) << 4))
@@ -199,8 +202,6 @@ static int tpm_cr50_i2c_read(struct tpm_chip *chip, u8 addr, u8 *buffer, size_t
};
int rc;
- i2c_lock_bus(client->adapter, I2C_LOCK_SEGMENT);
-
/* Prepare for completion interrupt */
tpm_cr50_i2c_enable_tpm_irq(chip);
@@ -219,7 +220,6 @@ static int tpm_cr50_i2c_read(struct tpm_chip *chip, u8 addr, u8 *buffer, size_t
out:
tpm_cr50_i2c_disable_tpm_irq(chip);
- i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT);
if (rc < 0)
return rc;
@@ -261,8 +261,6 @@ static int tpm_cr50_i2c_write(struct tpm_chip *chip, u8 addr, u8 *buffer,
priv->buf[0] = addr;
memcpy(priv->buf + 1, buffer, len);
- i2c_lock_bus(client->adapter, I2C_LOCK_SEGMENT);
-
/* Prepare for completion interrupt */
tpm_cr50_i2c_enable_tpm_irq(chip);
@@ -276,7 +274,6 @@ static int tpm_cr50_i2c_write(struct tpm_chip *chip, u8 addr, u8 *buffer,
out:
tpm_cr50_i2c_disable_tpm_irq(chip);
- i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT);
if (rc < 0)
return rc;
@@ -285,25 +282,26 @@ out:
}
/**
- * tpm_cr50_check_locality() - Verify TPM locality 0 is active.
+ * tpm_cr50_check_locality() - Verify if required TPM locality is active.
* @chip: A TPM chip.
+ * @loc: Locality to be verified
*
* Return:
- * - 0: Success.
+ * - loc: Success.
* - -errno: A POSIX error code.
*/
-static int tpm_cr50_check_locality(struct tpm_chip *chip)
+static int tpm_cr50_check_locality(struct tpm_chip *chip, int loc)
{
u8 mask = TPM_ACCESS_VALID | TPM_ACCESS_ACTIVE_LOCALITY;
u8 buf;
int rc;
- rc = tpm_cr50_i2c_read(chip, TPM_I2C_ACCESS(0), &buf, sizeof(buf));
+ rc = tpm_cr50_i2c_read(chip, TPM_I2C_ACCESS(loc), &buf, sizeof(buf));
if (rc < 0)
return rc;
if ((buf & mask) == mask)
- return 0;
+ return loc;
return -EIO;
}
@@ -311,53 +309,72 @@ static int tpm_cr50_check_locality(struct tpm_chip *chip)
/**
* tpm_cr50_release_locality() - Release TPM locality.
* @chip: A TPM chip.
- * @force: Flag to force release if set.
+ * @loc: Locality to be released
+ *
+ * Return:
+ * - 0: Success.
+ * - -errno: A POSIX error code.
*/
-static void tpm_cr50_release_locality(struct tpm_chip *chip, bool force)
+static int tpm_cr50_release_locality(struct tpm_chip *chip, int loc)
{
+ struct i2c_client *client = to_i2c_client(chip->dev.parent);
u8 mask = TPM_ACCESS_VALID | TPM_ACCESS_REQUEST_PENDING;
- u8 addr = TPM_I2C_ACCESS(0);
+ u8 addr = TPM_I2C_ACCESS(loc);
u8 buf;
+ int rc;
- if (tpm_cr50_i2c_read(chip, addr, &buf, sizeof(buf)) < 0)
- return;
+ rc = tpm_cr50_i2c_read(chip, addr, &buf, sizeof(buf));
+ if (rc < 0)
+ goto unlock_out;
- if (force || (buf & mask) == mask) {
+ if ((buf & mask) == mask) {
buf = TPM_ACCESS_ACTIVE_LOCALITY;
- tpm_cr50_i2c_write(chip, addr, &buf, sizeof(buf));
+ rc = tpm_cr50_i2c_write(chip, addr, &buf, sizeof(buf));
}
+
+unlock_out:
+ i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT);
+ return rc;
}
/**
- * tpm_cr50_request_locality() - Request TPM locality 0.
+ * tpm_cr50_request_locality() - Request TPM locality.
* @chip: A TPM chip.
+ * @loc: Locality to be requested.
*
* Return:
- * - 0: Success.
+ * - loc: Success.
* - -errno: A POSIX error code.
*/
-static int tpm_cr50_request_locality(struct tpm_chip *chip)
+static int tpm_cr50_request_locality(struct tpm_chip *chip, int loc)
{
+ struct i2c_client *client = to_i2c_client(chip->dev.parent);
u8 buf = TPM_ACCESS_REQUEST_USE;
unsigned long stop;
int rc;
- if (!tpm_cr50_check_locality(chip))
- return 0;
+ i2c_lock_bus(client->adapter, I2C_LOCK_SEGMENT);
- rc = tpm_cr50_i2c_write(chip, TPM_I2C_ACCESS(0), &buf, sizeof(buf));
+ if (tpm_cr50_check_locality(chip, loc) == loc)
+ return loc;
+
+ rc = tpm_cr50_i2c_write(chip, TPM_I2C_ACCESS(loc), &buf, sizeof(buf));
if (rc < 0)
- return rc;
+ goto unlock_out;
stop = jiffies + chip->timeout_a;
do {
- if (!tpm_cr50_check_locality(chip))
- return 0;
+ if (tpm_cr50_check_locality(chip, loc) == loc)
+ return loc;
msleep(TPM_CR50_TIMEOUT_SHORT_MS);
} while (time_before(jiffies, stop));
- return -ETIMEDOUT;
+ rc = -ETIMEDOUT;
+
+unlock_out:
+ i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT);
+ return rc;
}
/**
@@ -373,7 +390,7 @@ static u8 tpm_cr50_i2c_tis_status(struct tpm_chip *chip)
{
u8 buf[4];
- if (tpm_cr50_i2c_read(chip, TPM_I2C_STS(0), buf, sizeof(buf)) < 0)
+ if (tpm_cr50_i2c_read(chip, TPM_I2C_STS(chip->locality), buf, sizeof(buf)) < 0)
return 0;
return buf[0];
@@ -389,7 +406,7 @@ static void tpm_cr50_i2c_tis_set_ready(struct tpm_chip *chip)
{
u8 buf[4] = { TPM_STS_COMMAND_READY };
- tpm_cr50_i2c_write(chip, TPM_I2C_STS(0), buf, sizeof(buf));
+ tpm_cr50_i2c_write(chip, TPM_I2C_STS(chip->locality), buf, sizeof(buf));
msleep(TPM_CR50_TIMEOUT_SHORT_MS);
}
@@ -419,7 +436,7 @@ static int tpm_cr50_i2c_get_burst_and_status(struct tpm_chip *chip, u8 mask,
stop = jiffies + chip->timeout_b;
do {
- if (tpm_cr50_i2c_read(chip, TPM_I2C_STS(0), buf, sizeof(buf)) < 0) {
+ if (tpm_cr50_i2c_read(chip, TPM_I2C_STS(chip->locality), buf, sizeof(buf)) < 0) {
msleep(TPM_CR50_TIMEOUT_SHORT_MS);
continue;
}
@@ -453,7 +470,7 @@ static int tpm_cr50_i2c_tis_recv(struct tpm_chip *chip, u8 *buf, size_t buf_len)
u8 mask = TPM_STS_VALID | TPM_STS_DATA_AVAIL;
size_t burstcnt, cur, len, expected;
- u8 addr = TPM_I2C_DATA_FIFO(0);
+ u8 addr = TPM_I2C_DATA_FIFO(chip->locality);
u32 status;
int rc;
@@ -515,7 +532,6 @@ static int tpm_cr50_i2c_tis_recv(struct tpm_chip *chip, u8 *buf, size_t buf_len)
goto out_err;
}
- tpm_cr50_release_locality(chip, false);
return cur;
out_err:
@@ -523,7 +539,6 @@ out_err:
if (tpm_cr50_i2c_tis_status(chip) & TPM_STS_COMMAND_READY)
tpm_cr50_i2c_tis_set_ready(chip);
- tpm_cr50_release_locality(chip, false);
return rc;
}
@@ -545,10 +560,6 @@ static int tpm_cr50_i2c_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
u32 status;
int rc;
- rc = tpm_cr50_request_locality(chip);
- if (rc < 0)
- return rc;
-
/* Wait until TPM is ready for a command */
stop = jiffies + chip->timeout_b;
while (!(tpm_cr50_i2c_tis_status(chip) & TPM_STS_COMMAND_READY)) {
@@ -577,7 +588,8 @@ static int tpm_cr50_i2c_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
* that is inserted by tpm_cr50_i2c_write()
*/
limit = min_t(size_t, burstcnt - 1, len);
- rc = tpm_cr50_i2c_write(chip, TPM_I2C_DATA_FIFO(0), &buf[sent], limit);
+ rc = tpm_cr50_i2c_write(chip, TPM_I2C_DATA_FIFO(chip->locality),
+ &buf[sent], limit);
if (rc < 0) {
dev_err(&chip->dev, "Write failed\n");
goto out_err;
@@ -598,7 +610,7 @@ static int tpm_cr50_i2c_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
}
/* Start the TPM command */
- rc = tpm_cr50_i2c_write(chip, TPM_I2C_STS(0), tpm_go,
+ rc = tpm_cr50_i2c_write(chip, TPM_I2C_STS(chip->locality), tpm_go,
sizeof(tpm_go));
if (rc < 0) {
dev_err(&chip->dev, "Start command failed\n");
@@ -611,7 +623,6 @@ out_err:
if (tpm_cr50_i2c_tis_status(chip) & TPM_STS_COMMAND_READY)
tpm_cr50_i2c_tis_set_ready(chip);
- tpm_cr50_release_locality(chip, false);
return rc;
}
@@ -650,6 +661,8 @@ static const struct tpm_class_ops cr50_i2c = {
.req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
.req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
.req_canceled = &tpm_cr50_i2c_req_canceled,
+ .request_locality = &tpm_cr50_request_locality,
+ .relinquish_locality = &tpm_cr50_release_locality,
};
#ifdef CONFIG_ACPI
@@ -669,6 +682,27 @@ MODULE_DEVICE_TABLE(of, of_cr50_i2c_match);
#endif
/**
+ * tpm_cr50_vid_to_name() - Maps VID to name.
+ * @vendor: Vendor identifier to map to name
+ *
+ * Return:
+ * A valid string for the vendor or empty string
+ */
+static const char *tpm_cr50_vid_to_name(u32 vendor)
+{
+ switch (vendor) {
+ case TPM_CR50_I2C_DID_VID:
+ return "cr50";
+ case TPM_TI50_DT_I2C_DID_VID:
+ return "ti50 DT";
+ case TPM_TI50_OT_I2C_DID_VID:
+ return "ti50 OT";
+ default:
+ return "unknown";
+ }
+}
+
+/**
* tpm_cr50_i2c_probe() - Driver probe function.
* @client: I2C client information.
*
@@ -684,6 +718,7 @@ static int tpm_cr50_i2c_probe(struct i2c_client *client)
u32 vendor;
u8 buf[4];
int rc;
+ int loc;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
return -ENODEV;
@@ -726,29 +761,37 @@ static int tpm_cr50_i2c_probe(struct i2c_client *client)
TPM_CR50_TIMEOUT_NOIRQ_MS);
}
- rc = tpm_cr50_request_locality(chip);
- if (rc < 0) {
+ loc = tpm_cr50_request_locality(chip, TPM_CR50_I2C_DEFAULT_LOC);
+ if (loc < 0) {
dev_err(dev, "Could not request locality\n");
- return rc;
+ return loc;
}
/* Read four bytes from DID_VID register */
- rc = tpm_cr50_i2c_read(chip, TPM_I2C_DID_VID(0), buf, sizeof(buf));
+ rc = tpm_cr50_i2c_read(chip, TPM_I2C_DID_VID(loc), buf, sizeof(buf));
if (rc < 0) {
dev_err(dev, "Could not read vendor id\n");
- tpm_cr50_release_locality(chip, true);
+ if (tpm_cr50_release_locality(chip, loc))
+ dev_err(dev, "Could not release locality\n");
+ return rc;
+ }
+
+ rc = tpm_cr50_release_locality(chip, loc);
+ if (rc) {
+ dev_err(dev, "Could not release locality\n");
return rc;
}
vendor = le32_to_cpup((__le32 *)buf);
- if (vendor != TPM_CR50_I2C_DID_VID && vendor != TPM_TI50_I2C_DID_VID) {
+ if (vendor != TPM_CR50_I2C_DID_VID &&
+ vendor != TPM_TI50_DT_I2C_DID_VID &&
+ vendor != TPM_TI50_OT_I2C_DID_VID) {
dev_err(dev, "Vendor ID did not match! ID was %08x\n", vendor);
- tpm_cr50_release_locality(chip, true);
return -ENODEV;
}
dev_info(dev, "%s TPM 2.0 (i2c 0x%02x irq %d id 0x%x)\n",
- vendor == TPM_TI50_I2C_DID_VID ? "ti50" : "cr50",
+ tpm_cr50_vid_to_name(vendor),
client->addr, client->irq, vendor >> 16);
return tpm_chip_register(chip);
}
@@ -772,7 +815,6 @@ static void tpm_cr50_i2c_remove(struct i2c_client *client)
}
tpm_chip_unregister(chip);
- tpm_cr50_release_locality(chip, true);
}
static SIMPLE_DEV_PM_OPS(cr50_i2c_pm, tpm_pm_suspend, tpm_pm_resume);
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-28 22:29:51 +0100