tpm: add TPM2_SelfTest command support

Add support for the TPM2_Selftest command.

Change the command file and the help accordingly.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

3 files changed, 47 insertions, 0 deletions

diff --git a/cmd/tpm-v2.c b/cmd/tpm-v2.c
index 8589daeb0a..885bb0591f 100644
--- a/cmd/tpm-v2.c
+++ b/cmd/tpm-v2.c
@@ -31,10 +31,31 @@ static int do_tpm2_startup(cmd_tbl_t *cmdtp, int flag, int argc,
 	return report_return_code(tpm2_startup(mode));
 }
 
+static int do_tpm2_self_test(cmd_tbl_t *cmdtp, int flag, int argc,
+			     char * const argv[])
+{
+	enum tpm2_yes_no full_test;
+
+	if (argc != 2)
+		return CMD_RET_USAGE;
+
+	if (!strcasecmp("full", argv[1])) {
+		full_test = TPMI_YES;
+	} else if (!strcasecmp("continue", argv[1])) {
+		full_test = TPMI_NO;
+	} else {
+		printf("Couldn't recognize test mode: %s\n", argv[1]);
+		return CMD_RET_FAILURE;
+	}
+
+	return report_return_code(tpm2_self_test(full_test));
+}
+
 static cmd_tbl_t tpm2_commands[] = {
 	U_BOOT_CMD_MKENT(info, 0, 1, do_tpm_info, "", ""),
 	U_BOOT_CMD_MKENT(init, 0, 1, do_tpm_init, "", ""),
 	U_BOOT_CMD_MKENT(startup, 0, 1, do_tpm2_startup, "", ""),
+	U_BOOT_CMD_MKENT(self_test, 0, 1, do_tpm2_self_test, "", ""),
 };
 
 cmd_tbl_t *get_tpm_commands(unsigned int *size)
@@ -56,4 +77,9 @@ U_BOOT_CMD(tpm, CONFIG_SYS_MAXARGS, 1, do_tpm, "Issue a TPMv2.x command",
 "    <mode> is one of:\n"
 "        * TPM2_SU_CLEAR (reset state)\n"
 "        * TPM2_SU_STATE (preserved state)\n"
+"self_test <type>\n"
+"    Test the TPM capabilities.\n"
+"    <type> is one of:\n"
+"        * full (perform all tests)\n"
+"        * continue (only check untested tests)\n"
 );
diff --git a/include/tpm-v2.h b/include/tpm-v2.h
index a9c604dd52..29422ee11b 100644
--- a/include/tpm-v2.h
+++ b/include/tpm-v2.h
@@ -134,4 +134,13 @@ enum tpm2_algorithms {
  */
 u32 tpm2_startup(enum tpm2_startup_types mode);
 
+/**
+ * Issue a TPM2_SelfTest command.
+ *
+ * @full_test	Asking to perform all tests or only the untested ones
+ *
+ * @return code of the operation
+ */
+u32 tpm2_self_test(enum tpm2_yes_no full_test);
+
 #endif /* __TPM_V2_H */
diff --git a/lib/tpm-v2.c b/lib/tpm-v2.c
index 1a81177f75..a317e03607 100644
--- a/lib/tpm-v2.c
+++ b/lib/tpm-v2.c
@@ -30,3 +30,15 @@ u32 tpm2_startup(enum tpm2_startup_types mode)
 
 	return 0;
 }
+
+u32 tpm2_self_test(enum tpm2_yes_no full_test)
+{
+	const u8 command_v2[12] = {
+		tpm_u16(TPM2_ST_NO_SESSIONS),
+		tpm_u32(11),
+		tpm_u32(TPM2_CC_SELF_TEST),
+		full_test,
+	};
+
+	return tpm_sendrecv_command(command_v2, NULL, NULL);
+}