[PATCH v3 6/6] tpm: TPM 2.0 FIFO Interface

[Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>]

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 | 75 ++++++++++++++++++++++++++++++++++++----------
 1 file changed, 59 insertions(+), 16 deletions(-)

diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index e2cb04d..ec89c61d 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;
@@ -542,6 +554,8 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
 	u32 vendor, intfcaps, intmask;
 	int rc, i, irq_s, irq_e, probe;
 	struct tpm_chip *chip;
+	u8 sts3;
+	u32 dummy;
 
 	chip = tpmm_chip_alloc(dev, &tpm_tis);
 	if (IS_ERR(chip))
@@ -551,11 +565,28 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
 	if (!chip->vendor.iobase)
 		return -EIO;
 
-	/* 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);
+	sts3 = ioread8(chip->vendor.iobase + TPM_STS3(1));
+	if (sts3 & TPM_STS3_TPM2_FAM)
+		chip->flags = TPM_CHIP_FLAG_TPM2;
+
+        /* Default timeouts */
+        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;
@@ -570,9 +601,9 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
 	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",
-		 vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
+        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) {
 		probe = probe_itpm(chip);
@@ -619,7 +650,11 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
 		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;
@@ -680,7 +715,11 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
 			chip->vendor.probed_irq = 0;
 
 			/* Generate Interrupts */
-			tpm_gen_interrupt(chip);
+			if (chip->flags & TPM_CHIP_FLAG_TPM2)
+				rc = tpm2_get_tpm_pt(chip, TPM2_CAP_TPM_PROPERTIES, &dummy,
+						     "attempting to generate an interrupt");
+			else
+				tpm_gen_interrupt(chip);
 
 			chip->vendor.irq = chip->vendor.probed_irq;
 
@@ -756,14 +795,18 @@ 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