tpm: factor out tpm_startup function

TPM manual startup is used only from within TPM 1.x or TPM 2.x
code, hence remove tpm_startup() function from tpm-interface.c
and add two static functions implementations tpm1_startup()
and tpm2_startup() into to tpm1-cmd.c and tpm2-cmd.c respectively.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

1 files changed, 32 insertions, 2 deletions

diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index dd2e98f4de08..6ca4fc0a0d6f 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -949,6 +949,36 @@ out:
 }
 
 /**
+ * tpm2_startup - turn on the TPM
+ * @chip: TPM chip to use
+ *
+ * Normally the firmware should start the TPM. This function is provided as a
+ * workaround if this does not happen. A legal case for this could be for
+ * example when a TPM emulator is used.
+ *
+ * Return: same as tpm_transmit_cmd()
+ */
+
+static int tpm2_startup(struct tpm_chip *chip)
+{
+	struct tpm_buf buf;
+	int rc;
+
+	dev_info(&chip->dev, "starting up the TPM manually\n");
+
+	rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_STARTUP);
+	if (rc < 0)
+		return rc;
+
+	tpm_buf_append_u16(&buf, TPM2_SU_CLEAR);
+	rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 0, 0,
+			      "attempting to start the TPM");
+	tpm_buf_destroy(&buf);
+
+	return rc;
+}
+
+/**
  * tpm2_auto_startup - Perform the standard automatic TPM initialization
  *                     sequence
  * @chip: TPM chip to use
@@ -959,7 +989,7 @@ int tpm2_auto_startup(struct tpm_chip *chip)
 {
 	int rc;
 
-	rc = tpm_get_timeouts(chip);
+	rc = tpm2_get_timeouts(chip);
 	if (rc)
 		goto out;
 
@@ -968,7 +998,7 @@ int tpm2_auto_startup(struct tpm_chip *chip)
 		goto out;
 
 	if (rc == TPM2_RC_INITIALIZE) {
-		rc = tpm_startup(chip);
+		rc = tpm2_startup(chip);
 		if (rc)
 			goto out;