From 54226819429bb3d34b4914a69713046c52e03973 Mon Sep 17 00:00:00 2001
From: Christian Walter <christian.walter@9elements.com>
Date: Tue, 16 Jul 2019 20:07:36 +0200
Subject: drivers/crb: Add support for PTT

When we use Intel Platform Trust Technologies, we need to verify
that the enable bit is set before we use the integrated TPM.

Change-Id: I3b262a5d5253648fb96fb1fd9ba3995f92755bb1
Signed-off-by: Christian Walter <christian.walter@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34381
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
---
 src/drivers/crb/tis.c | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'src')

diff --git a/src/drivers/crb/tis.c b/src/drivers/crb/tis.c
index c110151766..94bfb9ef15 100644
--- a/src/drivers/crb/tis.c
+++ b/src/drivers/crb/tis.c
@@ -16,6 +16,7 @@
 #include <security/tpm/tis.h>
 #include <arch/acpigen.h>
 #include <device/device.h>
+#include <drivers/intel/ptt/ptt.h>
 
 #include "tpm.h"
 #include "chip.h"
@@ -49,6 +50,14 @@ int tis_open(void)
 		return -1;
 	}
 
+	if (CONFIG(HAVE_INTEL_PTT)) {
+		if (!ptt_active()) {
+			printk(BIOS_ERR, "%s: Intel PTT is not active.\n", __func__);
+			return -1;
+		}
+		printk(BIOS_DEBUG, "%s: Intel PTT is active.\n", __func__);
+	}
+
 	return 0;
 }
 
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