tpm: Add 'tpm autostart' shell command

For a TPM device to be operational we need to initialize it and
perform its startup sequence.  The 'tpm init' command currently calls
tpm_init() which ends up calling the ->open() per-device callback and
performs the initial hardware configuration as well as requesting
locality 0 for the caller.  There no code that currently calls
tpm_init() without following up with a tpm_startup() and tpm_self_test_full()
or tpm_continue_self_test().

So let's add a 'tpm autostart' command and call tpm_auto_start() which
leaves the device in an operational state.

It's worth noting that calling tpm_init() only, doesn't allow a someone
to use the TPM since the startup sequence is mandatory. We always
repeat the pattern of calling
- tpm_init()
- tpm_startup()
- tpm_self_test_full() or tpm_continue_self_test()

Reviewed-by: Simon Glass <[email protected]>
Signed-off-by: Ilias Apalodimas <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/cmd/tpm-user-utils.h b/cmd/tpm-user-utils.h
index de4a934aab6..dfa11353e12 100644
--- a/cmd/tpm-user-utils.h
+++ b/cmd/tpm-user-utils.h
@@ -20,6 +20,7 @@ int get_tpm(struct udevice **devp);
 int do_tpm_device(struct cmd_tbl *cmdtp, int flag, int argc,
 		  char *const argv[]);
 int do_tpm_init(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);
+int do_tpm_autostart(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);
 int do_tpm_info(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);
 int do_tpm_report_state(struct cmd_tbl *cmdtp, int flag, int argc,
 			char *const argv[]);