cr50: vendor command to report tpm state

This vendor command allows the host to retrieve the internal TPM
state. The first version of the command will return the failure
information collected during assert, if it ever happened, retry
counter value and the maximum retry counter value to be able to detect
if TPM is in lockout.

The structure is packed, it is serialized before being sent to the
host.

BRANCH=none
BUG=chrome-os-partner:60555
TEST=when running on a reef with a depthcharge image capable of
     displaying TPM state on errors observed state information added
     to the recovery screen text display.

Change-Id: I9d37f7a971013ce802f63218d43697fab68276c9
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/430952
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Andrey Pronin <apronin@chromium.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/tpm_vendor_cmds.h b/include/tpm_vendor_cmds.h
index f81abf70d0..89d0b8e770 100644
--- a/include/tpm_vendor_cmds.h
+++ b/include/tpm_vendor_cmds.h
@@ -34,6 +34,10 @@ enum vendor_cmd_cc {
 	VENDOR_CC_INVALIDATE_INACTIVE_RW = 20,
 	VENDOR_CC_COMMIT_NVMEM = 21,
 
+	/* A gap left for the deep sleep control command. */
+
+	VENDOR_CC_REPORT_TPM_STATE = 23,
+
 	LAST_VENDOR_COMMAND = 65535,
 };