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Subject[PATCH v6 09/10] tpm: TPM 2.0 FIFO Interface
Date
From: Will Arthur <will.c.arthur@intel.com>

Detect TPM 2.0 by using the extended STS (STS3) register. For TPM 2.0,
instead of calling tpm_get_timeouts(), assign duration and timeout
values defined in the TPM 2.0 PTP specification.

Signed-off-by: Will Arthur <will.c.arthur@intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
drivers/char/tpm/tpm_tis.c | 71 ++++++++++++++++++++++++++++++++++++----------
1 file changed, 56 insertions(+), 15 deletions(-)

diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index 7a2c59b..0b3c089 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -1,5 +1,6 @@
/*
* Copyright (C) 2005, 2006 IBM Corporation
+ * Copyright (C) 2014 Intel Corporation
*
* Authors:
* Leendert van Doorn <leendert@watson.ibm.com>
@@ -44,6 +45,10 @@ enum tis_status {
TPM_STS_DATA_EXPECT = 0x08,
};

+enum tis_status3 {
+ TPM_STS3_TPM2_FAM = 0x04,
+};
+
enum tis_int_flags {
TPM_GLOBAL_INT_ENABLE = 0x80000000,
TPM_INTF_BURST_COUNT_STATIC = 0x100,
@@ -70,6 +75,7 @@ enum tis_defaults {
#define TPM_INT_STATUS(l) (0x0010 | ((l) << 12))
#define TPM_INTF_CAPS(l) (0x0014 | ((l) << 12))
#define TPM_STS(l) (0x0018 | ((l) << 12))
+#define TPM_STS3(l) (0x001b | ((l) << 12))
#define TPM_DATA_FIFO(l) (0x0024 | ((l) << 12))

#define TPM_DID_VID(l) (0x0F00 | ((l) << 12))
@@ -344,6 +350,7 @@ static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
{
int rc;
u32 ordinal;
+ unsigned long dur;

rc = tpm_tis_send_data(chip, buf, len);
if (rc < 0)
@@ -355,9 +362,14 @@ static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)

if (chip->vendor.irq) {
ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
+
+ if (chip->flags & TPM_CHIP_FLAG_TPM2)
+ dur = tpm_calc_ordinal_duration(chip, ordinal);
+ else
+ dur = tpm_calc_ordinal_duration(chip, ordinal);
+
if (wait_for_tpm_stat
- (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
- tpm_calc_ordinal_duration(chip, ordinal),
+ (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID, dur,
&chip->vendor.read_queue, false) < 0) {
rc = -ETIME;
goto out_err;
@@ -543,6 +555,7 @@ static int tpm_tis_init(struct device *dev, acpi_handle acpi_dev_handle,
u32 vendor, intfcaps, intmask;
int rc, i, irq_s, irq_e, probe;
struct tpm_chip *chip;
+ u8 sts3;

chip = tpmm_chip_alloc(dev, &tpm_tis);
if (IS_ERR(chip))
@@ -554,11 +567,28 @@ static int tpm_tis_init(struct device *dev, acpi_handle acpi_dev_handle,
if (!chip->vendor.iobase)
return -EIO;

+ sts3 = ioread8(chip->vendor.iobase + TPM_STS3(1));
+ if (sts3 & TPM_STS3_TPM2_FAM)
+ chip->flags = TPM_CHIP_FLAG_TPM2;
+
/* Default timeouts */
- chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
- chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
- chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
- chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
+ if (chip->flags & TPM_CHIP_FLAG_TPM2) {
+ chip->vendor.timeout_a = usecs_to_jiffies(TPM2_TIMEOUT_A);
+ chip->vendor.timeout_b = usecs_to_jiffies(TPM2_TIMEOUT_B);
+ chip->vendor.timeout_c = usecs_to_jiffies(TPM2_TIMEOUT_C);
+ chip->vendor.timeout_d = usecs_to_jiffies(TPM2_TIMEOUT_D);
+ chip->vendor.duration[TPM_SHORT] =
+ usecs_to_jiffies(TPM2_DURATION_SHORT);
+ chip->vendor.duration[TPM_MEDIUM] =
+ usecs_to_jiffies(TPM2_DURATION_MEDIUM);
+ chip->vendor.duration[TPM_LONG] =
+ usecs_to_jiffies(TPM2_DURATION_LONG);
+ } else {
+ chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
+ chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
+ 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;
@@ -573,8 +603,8 @@ static int tpm_tis_init(struct device *dev, acpi_handle acpi_dev_handle,
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",
+ dev_info(dev, "%s TPM (device-id 0x%X, rev-id %d)\n",
+ (chip->flags & TPM_CHIP_FLAG_TPM2) ? "2.0" : "1.2",
vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));

if (!itpm) {
@@ -616,13 +646,17 @@ static int tpm_tis_init(struct device *dev, acpi_handle acpi_dev_handle,
dev_dbg(dev, "\tData Avail Int Support\n");

/* get the timeouts before testing for irqs */
- if (tpm_get_timeouts(chip)) {
+ if (!(chip->flags & TPM_CHIP_FLAG_TPM2) && tpm_get_timeouts(chip)) {
dev_err(dev, "Could not get TPM timeouts and durations\n");
rc = -ENODEV;
goto out_err;
}

- if (tpm_do_selftest(chip)) {
+ if (chip->flags & TPM_CHIP_FLAG_TPM2)
+ rc = tpm2_do_selftest(chip);
+ else
+ rc = tpm_do_selftest(chip);
+ if (rc) {
dev_err(dev, "TPM self test failed\n");
rc = -ENODEV;
goto out_err;
@@ -683,7 +717,10 @@ static int tpm_tis_init(struct device *dev, acpi_handle acpi_dev_handle,
chip->vendor.probed_irq = 0;

/* Generate Interrupts */
- tpm_gen_interrupt(chip);
+ if (chip->flags & TPM_CHIP_FLAG_TPM2)
+ tpm2_gen_interrupt(chip);
+ else
+ tpm_gen_interrupt(chip);

chip->vendor.irq = chip->vendor.probed_irq;

@@ -759,14 +796,18 @@ static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
static int tpm_tis_resume(struct device *dev)
{
struct tpm_chip *chip = dev_get_drvdata(dev);
- int ret;
+ int ret = 0;

if (chip->vendor.irq)
tpm_tis_reenable_interrupts(chip);

- ret = tpm_pm_resume(dev);
- if (!ret)
- tpm_do_selftest(chip);
+ if (chip->flags & TPM_CHIP_FLAG_TPM2)
+ tpm2_do_selftest(chip);
+ else {
+ ret = tpm_pm_resume(dev);
+ if (!ret)
+ tpm_do_selftest(chip);
+ }

return ret;
}
--
2.1.0


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