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-rw-r--r--drivers/char/tpm/tpm-chip.c44
-rw-r--r--drivers/char/tpm/tpm-interface.c53
-rw-r--r--drivers/char/tpm/tpm-sysfs.c8
-rw-r--r--drivers/char/tpm/tpm.h5
-rw-r--r--drivers/char/tpm/tpm2-cmd.c2
-rw-r--r--drivers/char/tpm/tpm_crb.c3
-rw-r--r--drivers/char/tpm/tpm_i2c_nuvoton.c24
-rw-r--r--drivers/char/tpm/tpm_ibmvtpm.c17
-rw-r--r--drivers/char/tpm/tpm_tis.c2
-rw-r--r--drivers/char/tpm/tpm_tis_core.c6
-rw-r--r--drivers/char/tpm/tpm_tis_spi.c160
11 files changed, 186 insertions, 138 deletions
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index e5950131bd90..9ff853229957 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -130,6 +130,41 @@ static void tpm_dev_release(struct device *dev)
kfree(chip);
}
+
+/**
+ * tpm_class_shutdown() - prepare the TPM device for loss of power.
+ * @dev: device to which the chip is associated.
+ *
+ * Issues a TPM2_Shutdown command prior to loss of power, as required by the
+ * TPM 2.0 spec.
+ * Then, calls bus- and device- specific shutdown code.
+ *
+ * XXX: This codepath relies on the fact that sysfs is not enabled for
+ * TPM2: sysfs uses an implicit lock on chip->ops, so this could race if TPM2
+ * has sysfs support enabled before TPM sysfs's implicit locking is fixed.
+ */
+static int tpm_class_shutdown(struct device *dev)
+{
+ struct tpm_chip *chip = container_of(dev, struct tpm_chip, dev);
+
+ if (chip->flags & TPM_CHIP_FLAG_TPM2) {
+ down_write(&chip->ops_sem);
+ tpm2_shutdown(chip, TPM2_SU_CLEAR);
+ chip->ops = NULL;
+ up_write(&chip->ops_sem);
+ }
+ /* Allow bus- and device-specific code to run. Note: since chip->ops
+ * is NULL, more-specific shutdown code will not be able to issue TPM
+ * commands.
+ */
+ if (dev->bus && dev->bus->shutdown)
+ dev->bus->shutdown(dev);
+ else if (dev->driver && dev->driver->shutdown)
+ dev->driver->shutdown(dev);
+ return 0;
+}
+
+
/**
* tpm_chip_alloc() - allocate a new struct tpm_chip instance
* @pdev: device to which the chip is associated
@@ -140,7 +175,7 @@ static void tpm_dev_release(struct device *dev)
* Allocates a new struct tpm_chip instance and assigns a free
* device number for it. Must be paired with put_device(&chip->dev).
*/
-struct tpm_chip *tpm_chip_alloc(struct device *dev,
+struct tpm_chip *tpm_chip_alloc(struct device *pdev,
const struct tpm_class_ops *ops)
{
struct tpm_chip *chip;
@@ -159,7 +194,7 @@ struct tpm_chip *tpm_chip_alloc(struct device *dev,
rc = idr_alloc(&dev_nums_idr, NULL, 0, TPM_NUM_DEVICES, GFP_KERNEL);
mutex_unlock(&idr_lock);
if (rc < 0) {
- dev_err(dev, "No available tpm device numbers\n");
+ dev_err(pdev, "No available tpm device numbers\n");
kfree(chip);
return ERR_PTR(rc);
}
@@ -168,8 +203,9 @@ struct tpm_chip *tpm_chip_alloc(struct device *dev,
device_initialize(&chip->dev);
chip->dev.class = tpm_class;
+ chip->dev.class->shutdown = tpm_class_shutdown;
chip->dev.release = tpm_dev_release;
- chip->dev.parent = dev;
+ chip->dev.parent = pdev;
chip->dev.groups = chip->groups;
if (chip->dev_num == 0)
@@ -181,7 +217,7 @@ struct tpm_chip *tpm_chip_alloc(struct device *dev,
if (rc)
goto out;
- if (!dev)
+ if (!pdev)
chip->flags |= TPM_CHIP_FLAG_VIRTUAL;
cdev_init(&chip->cdev, &tpm_fops);
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 3a9149cf0110..d0ac2d56520f 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -489,8 +489,7 @@ static int tpm_startup(struct tpm_chip *chip, __be16 startup_type)
int tpm_get_timeouts(struct tpm_chip *chip)
{
struct tpm_cmd_t tpm_cmd;
- unsigned long new_timeout[4];
- unsigned long old_timeout[4];
+ unsigned long timeout_old[4], timeout_chip[4], timeout_eff[4];
struct duration_t *duration_cap;
ssize_t rc;
@@ -542,11 +541,15 @@ int tpm_get_timeouts(struct tpm_chip *chip)
!= sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
return -EINVAL;
- old_timeout[0] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.a);
- old_timeout[1] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.b);
- old_timeout[2] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.c);
- old_timeout[3] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.d);
- memcpy(new_timeout, old_timeout, sizeof(new_timeout));
+ timeout_old[0] = jiffies_to_usecs(chip->timeout_a);
+ timeout_old[1] = jiffies_to_usecs(chip->timeout_b);
+ timeout_old[2] = jiffies_to_usecs(chip->timeout_c);
+ timeout_old[3] = jiffies_to_usecs(chip->timeout_d);
+ timeout_chip[0] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.a);
+ timeout_chip[1] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.b);
+ timeout_chip[2] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.c);
+ timeout_chip[3] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.d);
+ memcpy(timeout_eff, timeout_chip, sizeof(timeout_eff));
/*
* Provide ability for vendor overrides of timeout values in case
@@ -554,16 +557,24 @@ int tpm_get_timeouts(struct tpm_chip *chip)
*/
if (chip->ops->update_timeouts != NULL)
chip->timeout_adjusted =
- chip->ops->update_timeouts(chip, new_timeout);
+ chip->ops->update_timeouts(chip, timeout_eff);
if (!chip->timeout_adjusted) {
- /* Don't overwrite default if value is 0 */
- if (new_timeout[0] != 0 && new_timeout[0] < 1000) {
- int i;
+ /* Restore default if chip reported 0 */
+ int i;
+ for (i = 0; i < ARRAY_SIZE(timeout_eff); i++) {
+ if (timeout_eff[i])
+ continue;
+
+ timeout_eff[i] = timeout_old[i];
+ chip->timeout_adjusted = true;
+ }
+
+ if (timeout_eff[0] != 0 && timeout_eff[0] < 1000) {
/* timeouts in msec rather usec */
- for (i = 0; i != ARRAY_SIZE(new_timeout); i++)
- new_timeout[i] *= 1000;
+ for (i = 0; i != ARRAY_SIZE(timeout_eff); i++)
+ timeout_eff[i] *= 1000;
chip->timeout_adjusted = true;
}
}
@@ -572,16 +583,16 @@ int tpm_get_timeouts(struct tpm_chip *chip)
if (chip->timeout_adjusted) {
dev_info(&chip->dev,
HW_ERR "Adjusting reported timeouts: A %lu->%luus B %lu->%luus C %lu->%luus D %lu->%luus\n",
- old_timeout[0], new_timeout[0],
- old_timeout[1], new_timeout[1],
- old_timeout[2], new_timeout[2],
- old_timeout[3], new_timeout[3]);
+ timeout_chip[0], timeout_eff[0],
+ timeout_chip[1], timeout_eff[1],
+ timeout_chip[2], timeout_eff[2],
+ timeout_chip[3], timeout_eff[3]);
}
- chip->timeout_a = usecs_to_jiffies(new_timeout[0]);
- chip->timeout_b = usecs_to_jiffies(new_timeout[1]);
- chip->timeout_c = usecs_to_jiffies(new_timeout[2]);
- chip->timeout_d = usecs_to_jiffies(new_timeout[3]);
+ chip->timeout_a = usecs_to_jiffies(timeout_eff[0]);
+ chip->timeout_b = usecs_to_jiffies(timeout_eff[1]);
+ chip->timeout_c = usecs_to_jiffies(timeout_eff[2]);
+ chip->timeout_d = usecs_to_jiffies(timeout_eff[3]);
duration:
tpm_cmd.header.in = tpm_getcap_header;
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index a76ab4af9fb2..edf8c59a6ed4 100644
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -35,9 +35,10 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
ssize_t err;
int i, rc;
char *str = buf;
-
struct tpm_chip *chip = to_tpm_chip(dev);
+ memset(&tpm_cmd, 0, sizeof(tpm_cmd));
+
tpm_cmd.header.in = tpm_readpubek_header;
err = tpm_transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE, 0,
"attempting to read the PUBEK");
@@ -284,6 +285,11 @@ static const struct attribute_group tpm_dev_group = {
void tpm_sysfs_add_device(struct tpm_chip *chip)
{
+ /* XXX: If you wish to remove this restriction, you must first update
+ * tpm_sysfs to explicitly lock chip->ops.
+ */
+ if (chip->flags & TPM_CHIP_FLAG_TPM2)
+ return;
/* The sysfs routines rely on an implicit tpm_try_get_ops, device_del
* is called before ops is null'd and the sysfs core synchronizes this
* removal so that no callbacks are running or can run again
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 4d183c97f6a6..aa4299cf7e5a 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -518,6 +518,11 @@ static inline void tpm_add_ppi(struct tpm_chip *chip)
}
#endif
+static inline inline u32 tpm2_rc_value(u32 rc)
+{
+ return (rc & BIT(7)) ? rc & 0xff : rc;
+}
+
int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash);
int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max);
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index 7df55d58c939..17896d654033 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -529,7 +529,7 @@ out:
tpm_buf_destroy(&buf);
if (rc > 0) {
- if ((rc & TPM2_RC_HASH) == TPM2_RC_HASH)
+ if (tpm2_rc_value(rc) == TPM2_RC_HASH)
rc = -EINVAL;
else
rc = -EPERM;
diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index a7c870af916c..fa0f66809503 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -111,8 +111,7 @@ static int crb_recv(struct tpm_chip *chip, u8 *buf, size_t count)
memcpy_fromio(buf, priv->rsp, 6);
expected = be32_to_cpup((__be32 *) &buf[2]);
-
- if (expected > count)
+ if (expected > count || expected < 6)
return -EIO;
memcpy_fromio(&buf[6], &priv->rsp[6], expected - 6);
diff --git a/drivers/char/tpm/tpm_i2c_nuvoton.c b/drivers/char/tpm/tpm_i2c_nuvoton.c
index e3a9155ee671..c6428771841f 100644
--- a/drivers/char/tpm/tpm_i2c_nuvoton.c
+++ b/drivers/char/tpm/tpm_i2c_nuvoton.c
@@ -49,9 +49,10 @@
*/
#define TPM_I2C_MAX_BUF_SIZE 32
#define TPM_I2C_RETRY_COUNT 32
-#define TPM_I2C_BUS_DELAY 1 /* msec */
-#define TPM_I2C_RETRY_DELAY_SHORT 2 /* msec */
-#define TPM_I2C_RETRY_DELAY_LONG 10 /* msec */
+#define TPM_I2C_BUS_DELAY 1000 /* usec */
+#define TPM_I2C_RETRY_DELAY_SHORT (2 * 1000) /* usec */
+#define TPM_I2C_RETRY_DELAY_LONG (10 * 1000) /* usec */
+#define TPM_I2C_DELAY_RANGE 300 /* usec */
#define OF_IS_TPM2 ((void *)1)
#define I2C_IS_TPM2 1
@@ -123,7 +124,9 @@ static s32 i2c_nuvoton_write_status(struct i2c_client *client, u8 data)
/* this causes the current command to be aborted */
for (i = 0, status = -1; i < TPM_I2C_RETRY_COUNT && status < 0; i++) {
status = i2c_nuvoton_write_buf(client, TPM_STS, 1, &data);
- msleep(TPM_I2C_BUS_DELAY);
+ if (status < 0)
+ usleep_range(TPM_I2C_BUS_DELAY, TPM_I2C_BUS_DELAY
+ + TPM_I2C_DELAY_RANGE);
}
return status;
}
@@ -160,7 +163,8 @@ static int i2c_nuvoton_get_burstcount(struct i2c_client *client,
burst_count = min_t(u8, TPM_I2C_MAX_BUF_SIZE, data);
break;
}
- msleep(TPM_I2C_BUS_DELAY);
+ usleep_range(TPM_I2C_BUS_DELAY, TPM_I2C_BUS_DELAY
+ + TPM_I2C_DELAY_RANGE);
} while (time_before(jiffies, stop));
return burst_count;
@@ -203,13 +207,17 @@ static int i2c_nuvoton_wait_for_stat(struct tpm_chip *chip, u8 mask, u8 value,
return 0;
/* use polling to wait for the event */
- ten_msec = jiffies + msecs_to_jiffies(TPM_I2C_RETRY_DELAY_LONG);
+ ten_msec = jiffies + usecs_to_jiffies(TPM_I2C_RETRY_DELAY_LONG);
stop = jiffies + timeout;
do {
if (time_before(jiffies, ten_msec))
- msleep(TPM_I2C_RETRY_DELAY_SHORT);
+ usleep_range(TPM_I2C_RETRY_DELAY_SHORT,
+ TPM_I2C_RETRY_DELAY_SHORT
+ + TPM_I2C_DELAY_RANGE);
else
- msleep(TPM_I2C_RETRY_DELAY_LONG);
+ usleep_range(TPM_I2C_RETRY_DELAY_LONG,
+ TPM_I2C_RETRY_DELAY_LONG
+ + TPM_I2C_DELAY_RANGE);
status_valid = i2c_nuvoton_check_status(chip, mask,
value);
if (status_valid)
diff --git a/drivers/char/tpm/tpm_ibmvtpm.c b/drivers/char/tpm/tpm_ibmvtpm.c
index 946025a7413b..84eca4f93b82 100644
--- a/drivers/char/tpm/tpm_ibmvtpm.c
+++ b/drivers/char/tpm/tpm_ibmvtpm.c
@@ -295,6 +295,8 @@ static int tpm_ibmvtpm_remove(struct vio_dev *vdev)
}
kfree(ibmvtpm);
+ /* For tpm_ibmvtpm_get_desired_dma */
+ dev_set_drvdata(&vdev->dev, NULL);
return 0;
}
@@ -309,13 +311,16 @@ static int tpm_ibmvtpm_remove(struct vio_dev *vdev)
static unsigned long tpm_ibmvtpm_get_desired_dma(struct vio_dev *vdev)
{
struct tpm_chip *chip = dev_get_drvdata(&vdev->dev);
- struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev);
+ struct ibmvtpm_dev *ibmvtpm;
- /* ibmvtpm initializes at probe time, so the data we are
- * asking for may not be set yet. Estimate that 4K required
- * for TCE-mapped buffer in addition to CRQ.
- */
- if (!ibmvtpm)
+ /*
+ * ibmvtpm initializes at probe time, so the data we are
+ * asking for may not be set yet. Estimate that 4K required
+ * for TCE-mapped buffer in addition to CRQ.
+ */
+ if (chip)
+ ibmvtpm = dev_get_drvdata(&chip->dev);
+ else
return CRQ_RES_BUF_SIZE + PAGE_SIZE;
return CRQ_RES_BUF_SIZE + ibmvtpm->rtce_size;
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index eaf5730d79eb..8022bea27fed 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -421,7 +421,7 @@ err_pnp:
acpi_bus_unregister_driver(&tis_acpi_driver);
err_acpi:
#endif
- platform_device_unregister(force_pdev);
+ platform_driver_unregister(&tis_drv);
err_platform:
if (force_pdev)
platform_device_unregister(force_pdev);
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index a1ce0607bf7b..4d24ec3d7cd6 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -160,8 +160,10 @@ static int get_burstcount(struct tpm_chip *chip)
u32 value;
/* wait for burstcount */
- /* which timeout value, spec has 2 answers (c & d) */
- stop = jiffies + chip->timeout_d;
+ if (chip->flags & TPM_CHIP_FLAG_TPM2)
+ stop = jiffies + chip->timeout_a;
+ else
+ stop = jiffies + chip->timeout_d;
do {
rc = tpm_tis_read32(priv, TPM_STS(priv->locality), &value);
if (rc < 0)
diff --git a/drivers/char/tpm/tpm_tis_spi.c b/drivers/char/tpm/tpm_tis_spi.c
index dbaad9c681e3..3b97b14c3417 100644
--- a/drivers/char/tpm/tpm_tis_spi.c
+++ b/drivers/char/tpm/tpm_tis_spi.c
@@ -48,8 +48,8 @@ struct tpm_tis_spi_phy {
struct tpm_tis_data priv;
struct spi_device *spi_device;
- u8 tx_buf[MAX_SPI_FRAMESIZE + 4];
- u8 rx_buf[MAX_SPI_FRAMESIZE + 4];
+ u8 tx_buf[4];
+ u8 rx_buf[4];
};
static inline struct tpm_tis_spi_phy *to_tpm_tis_spi_phy(struct tpm_tis_data *data)
@@ -57,122 +57,98 @@ static inline struct tpm_tis_spi_phy *to_tpm_tis_spi_phy(struct tpm_tis_data *da
return container_of(data, struct tpm_tis_spi_phy, priv);
}
-static int tpm_tis_spi_read_bytes(struct tpm_tis_data *data, u32 addr,
- u16 len, u8 *result)
+static int tpm_tis_spi_transfer(struct tpm_tis_data *data, u32 addr, u16 len,
+ u8 *buffer, u8 direction)
{
struct tpm_tis_spi_phy *phy = to_tpm_tis_spi_phy(data);
- int ret, i;
+ int ret = 0;
+ int i;
struct spi_message m;
- struct spi_transfer spi_xfer = {
- .tx_buf = phy->tx_buf,
- .rx_buf = phy->rx_buf,
- .len = 4,
- };
+ struct spi_transfer spi_xfer;
+ u8 transfer_len;
- if (len > MAX_SPI_FRAMESIZE)
- return -ENOMEM;
+ spi_bus_lock(phy->spi_device->master);
- phy->tx_buf[0] = 0x80 | (len - 1);
- phy->tx_buf[1] = 0xd4;
- phy->tx_buf[2] = (addr >> 8) & 0xFF;
- phy->tx_buf[3] = addr & 0xFF;
+ while (len) {
+ transfer_len = min_t(u16, len, MAX_SPI_FRAMESIZE);
- spi_xfer.cs_change = 1;
- spi_message_init(&m);
- spi_message_add_tail(&spi_xfer, &m);
+ phy->tx_buf[0] = direction | (transfer_len - 1);
+ phy->tx_buf[1] = 0xd4;
+ phy->tx_buf[2] = addr >> 8;
+ phy->tx_buf[3] = addr;
+
+ memset(&spi_xfer, 0, sizeof(spi_xfer));
+ spi_xfer.tx_buf = phy->tx_buf;
+ spi_xfer.rx_buf = phy->rx_buf;
+ spi_xfer.len = 4;
+ spi_xfer.cs_change = 1;
- spi_bus_lock(phy->spi_device->master);
- ret = spi_sync_locked(phy->spi_device, &m);
- if (ret < 0)
- goto exit;
-
- memset(phy->tx_buf, 0, len);
-
- /* According to TCG PTP specification, if there is no TPM present at
- * all, then the design has a weak pull-up on MISO. If a TPM is not
- * present, a pull-up on MISO means that the SB controller sees a 1,
- * and will latch in 0xFF on the read.
- */
- for (i = 0; (phy->rx_buf[0] & 0x01) == 0 && i < TPM_RETRY; i++) {
- spi_xfer.len = 1;
spi_message_init(&m);
spi_message_add_tail(&spi_xfer, &m);
ret = spi_sync_locked(phy->spi_device, &m);
if (ret < 0)
goto exit;
- }
-
- spi_xfer.cs_change = 0;
- spi_xfer.len = len;
- spi_xfer.rx_buf = result;
-
- spi_message_init(&m);
- spi_message_add_tail(&spi_xfer, &m);
- ret = spi_sync_locked(phy->spi_device, &m);
-
-exit:
- spi_bus_unlock(phy->spi_device->master);
- return ret;
-}
-
-static int tpm_tis_spi_write_bytes(struct tpm_tis_data *data, u32 addr,
- u16 len, u8 *value)
-{
- struct tpm_tis_spi_phy *phy = to_tpm_tis_spi_phy(data);
- int ret, i;
- struct spi_message m;
- struct spi_transfer spi_xfer = {
- .tx_buf = phy->tx_buf,
- .rx_buf = phy->rx_buf,
- .len = 4,
- };
-
- if (len > MAX_SPI_FRAMESIZE)
- return -ENOMEM;
-
- phy->tx_buf[0] = len - 1;
- phy->tx_buf[1] = 0xd4;
- phy->tx_buf[2] = (addr >> 8) & 0xFF;
- phy->tx_buf[3] = addr & 0xFF;
- spi_xfer.cs_change = 1;
- spi_message_init(&m);
- spi_message_add_tail(&spi_xfer, &m);
+ if ((phy->rx_buf[3] & 0x01) == 0) {
+ // handle SPI wait states
+ phy->tx_buf[0] = 0;
+
+ for (i = 0; i < TPM_RETRY; i++) {
+ spi_xfer.len = 1;
+ spi_message_init(&m);
+ spi_message_add_tail(&spi_xfer, &m);
+ ret = spi_sync_locked(phy->spi_device, &m);
+ if (ret < 0)
+ goto exit;
+ if (phy->rx_buf[0] & 0x01)
+ break;
+ }
+
+ if (i == TPM_RETRY) {
+ ret = -ETIMEDOUT;
+ goto exit;
+ }
+ }
+
+ spi_xfer.cs_change = 0;
+ spi_xfer.len = transfer_len;
+ spi_xfer.delay_usecs = 5;
+
+ if (direction) {
+ spi_xfer.tx_buf = NULL;
+ spi_xfer.rx_buf = buffer;
+ } else {
+ spi_xfer.tx_buf = buffer;
+ spi_xfer.rx_buf = NULL;
+ }
- spi_bus_lock(phy->spi_device->master);
- ret = spi_sync_locked(phy->spi_device, &m);
- if (ret < 0)
- goto exit;
-
- memset(phy->tx_buf, 0, len);
-
- /* According to TCG PTP specification, if there is no TPM present at
- * all, then the design has a weak pull-up on MISO. If a TPM is not
- * present, a pull-up on MISO means that the SB controller sees a 1,
- * and will latch in 0xFF on the read.
- */
- for (i = 0; (phy->rx_buf[0] & 0x01) == 0 && i < TPM_RETRY; i++) {
- spi_xfer.len = 1;
spi_message_init(&m);
spi_message_add_tail(&spi_xfer, &m);
ret = spi_sync_locked(phy->spi_device, &m);
if (ret < 0)
goto exit;
- }
- spi_xfer.len = len;
- spi_xfer.tx_buf = value;
- spi_xfer.cs_change = 0;
- spi_xfer.tx_buf = value;
- spi_message_init(&m);
- spi_message_add_tail(&spi_xfer, &m);
- ret = spi_sync_locked(phy->spi_device, &m);
+ len -= transfer_len;
+ buffer += transfer_len;
+ }
exit:
spi_bus_unlock(phy->spi_device->master);
return ret;
}
+static int tpm_tis_spi_read_bytes(struct tpm_tis_data *data, u32 addr,
+ u16 len, u8 *result)
+{
+ return tpm_tis_spi_transfer(data, addr, len, result, 0x80);
+}
+
+static int tpm_tis_spi_write_bytes(struct tpm_tis_data *data, u32 addr,
+ u16 len, u8 *value)
+{
+ return tpm_tis_spi_transfer(data, addr, len, value, 0);
+}
+
static int tpm_tis_spi_read16(struct tpm_tis_data *data, u32 addr, u16 *result)
{
int rc;
generated by cgit v1.2.3 (git 2.0.4) at 2024-06-22 09:12:02 +0000