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path: root/drivers/char/tpm/tpm_tis.c
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Diffstat (limited to 'drivers/char/tpm/tpm_tis.c')
-rw-r--r--drivers/char/tpm/tpm_tis.c64
1 files changed, 51 insertions, 13 deletions
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index ea31dafbcac2..8a41b6be23a0 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -84,6 +84,9 @@ static int is_itpm(struct pnp_dev *dev)
struct acpi_device *acpi = pnp_acpi_device(dev);
struct acpi_hardware_id *id;
+ if (!acpi)
+ return 0;
+
list_for_each_entry(id, &acpi->pnp.ids, list) {
if (!strcmp("INTC0102", id->id))
return 1;
@@ -98,6 +101,22 @@ static inline int is_itpm(struct pnp_dev *dev)
}
#endif
+/* Before we attempt to access the TPM we must see that the valid bit is set.
+ * The specification says that this bit is 0 at reset and remains 0 until the
+ * 'TPM has gone through its self test and initialization and has established
+ * correct values in the other bits.' */
+static int wait_startup(struct tpm_chip *chip, int l)
+{
+ unsigned long stop = jiffies + chip->vendor.timeout_a;
+ do {
+ if (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
+ TPM_ACCESS_VALID)
+ return 0;
+ msleep(TPM_TIMEOUT);
+ } while (time_before(jiffies, stop));
+ return -1;
+}
+
static int check_locality(struct tpm_chip *chip, int l)
{
if ((ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
@@ -198,7 +217,7 @@ static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
wait_for_tpm_stat(chip,
TPM_STS_DATA_AVAIL | TPM_STS_VALID,
chip->vendor.timeout_c,
- &chip->vendor.read_queue)
+ &chip->vendor.read_queue, true)
== 0) {
burstcnt = get_burstcount(chip);
for (; burstcnt > 0 && size < count; burstcnt--)
@@ -241,7 +260,7 @@ static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
}
wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
- &chip->vendor.int_queue);
+ &chip->vendor.int_queue, false);
status = tpm_tis_status(chip);
if (status & TPM_STS_DATA_AVAIL) { /* retry? */
dev_err(chip->dev, "Error left over data\n");
@@ -277,7 +296,7 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
tpm_tis_ready(chip);
if (wait_for_tpm_stat
(chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
- &chip->vendor.int_queue) < 0) {
+ &chip->vendor.int_queue, false) < 0) {
rc = -ETIME;
goto out_err;
}
@@ -292,7 +311,7 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
}
wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
- &chip->vendor.int_queue);
+ &chip->vendor.int_queue, false);
status = tpm_tis_status(chip);
if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
rc = -EIO;
@@ -304,7 +323,7 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
iowrite8(buf[count],
chip->vendor.iobase + TPM_DATA_FIFO(chip->vendor.locality));
wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
- &chip->vendor.int_queue);
+ &chip->vendor.int_queue, false);
status = tpm_tis_status(chip);
if ((status & TPM_STS_DATA_EXPECT) != 0) {
rc = -EIO;
@@ -342,7 +361,7 @@ static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
if (wait_for_tpm_stat
(chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
tpm_calc_ordinal_duration(chip, ordinal),
- &chip->vendor.read_queue) < 0) {
+ &chip->vendor.read_queue, false) < 0) {
rc = -ETIME;
goto out_err;
}
@@ -374,7 +393,7 @@ static int probe_itpm(struct tpm_chip *chip)
if (vendor != TPM_VID_INTEL)
return 0;
- itpm = 0;
+ itpm = false;
rc = tpm_tis_send_data(chip, cmd_getticks, len);
if (rc == 0)
@@ -383,7 +402,7 @@ static int probe_itpm(struct tpm_chip *chip)
tpm_tis_ready(chip);
release_locality(chip, chip->vendor.locality, 0);
- itpm = 1;
+ itpm = true;
rc = tpm_tis_send_data(chip, cmd_getticks, len);
if (rc == 0) {
@@ -400,6 +419,19 @@ out:
return rc;
}
+static bool tpm_tis_req_canceled(struct tpm_chip *chip, u8 status)
+{
+ switch (chip->vendor.manufacturer_id) {
+ case TPM_VID_WINBOND:
+ return ((status == TPM_STS_VALID) ||
+ (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY)));
+ case TPM_VID_STM:
+ return (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY));
+ default:
+ return (status == TPM_STS_COMMAND_READY);
+ }
+}
+
static const struct file_operations tis_ops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
@@ -445,7 +477,7 @@ static struct tpm_vendor_specific tpm_tis = {
.cancel = tpm_tis_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,
+ .req_canceled = tpm_tis_req_canceled,
.attr_group = &tis_attr_grp,
.miscdev = {
.fops = &tis_ops,},
@@ -502,7 +534,7 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id)
return IRQ_HANDLED;
}
-static bool interrupts = 1;
+static bool interrupts = true;
module_param(interrupts, bool, 0444);
MODULE_PARM_DESC(interrupts, "Enable interrupts");
@@ -528,12 +560,18 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
+ if (wait_startup(chip, 0) != 0) {
+ rc = -ENODEV;
+ goto out_err;
+ }
+
if (request_locality(chip, 0) != 0) {
rc = -ENODEV;
goto out_err;
}
vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
+ chip->vendor.manufacturer_id = vendor;
dev_info(dev,
"1.2 TPM (device-id 0x%X, rev-id %d)\n",
@@ -545,7 +583,7 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
rc = -ENODEV;
goto out_err;
}
- itpm = (probe == 0) ? 0 : 1;
+ itpm = !!probe;
}
if (itpm)
@@ -741,10 +779,10 @@ static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
if (pnp_irq_valid(pnp_dev, 0))
irq = pnp_irq(pnp_dev, 0);
else
- interrupts = 0;
+ interrupts = false;
if (is_itpm(pnp_dev))
- itpm = 1;
+ itpm = true;
return tpm_tis_init(&pnp_dev->dev, start, len, irq);
}
generated by cgit v1.2.3 (git 2.0.4) at 2024-07-10 19:15:43 +0000