On 11/11/2014 08:45 AM, Jarkko Sakkinen wrote:
From: Will Arthur <will.c.art...@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.art...@intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakki...@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 <leend...@watson.ibm.com>
@@ -44,6 +45,10 @@ enum tis_status {
TPM_STS_DATA_EXPECT = 0x08,
};
+enum tis_status3 {
+ TPM_STS3_TPM2_FAM = 0x04,
+};
+
I just looked at the specs: You have to define a mask for bits 2 and 3
-> 0xc0.
@@ -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;
And use the mask here.
((sts3 & XYZ_MASK) == TPM_STS3_TPM2_FAM)
chip->flags = TPM_CHIP_FLAG_TPM2;
Since the bits 00 indicate TPM 1.2, 01 TPM2 and 10 and 11 are reserved!
Stefan
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