tpm: Probe for connected TPM 1.2 or TPM 2

In the TPM passthrough backend driver, modify the probing code so
that we can check whether a TPM 1.2 or TPM 2 is being used
and adapt the behavior of the TPM TIS accordingly.

Move the code that tested for a TPM 1.2 into tpm_utils.c
and extend it with test for probing for TPM 2. Have the
function return the version of TPM found.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/hw/tpm/tpm_int.h b/hw/tpm/tpm_int.h
index 9866c7962a..f2f285b3cc 100644
--- a/hw/tpm/tpm_int.h
+++ b/hw/tpm/tpm_int.h
@@ -66,4 +66,10 @@ struct tpm_resp_hdr {
 #define TPM_ORD_ContinueSelfTest  0x53
 #define TPM_ORD_GetTicks          0xf1
 
+
+/* TPM2 defines */
+#define TPM2_ST_NO_SESSIONS       0x8001
+
+#define TPM2_CC_ReadClock         0x00000181
+
 #endif /* TPM_TPM_INT_H */