3 files changed, 24 insertions, 28 deletions

diff --git a/sys/dev/tpm/tpm20.h b/sys/dev/tpm/tpm20.h
index b478f3d0eb22..619b101d2fee 100644
--- a/sys/dev/tpm/tpm20.h
+++ b/sys/dev/tpm/tpm20.h
@@ -93,6 +93,12 @@ __FBSDID("$FreeBSD$");
 #define	TPM_CDEV_NAME		"tpm0"
 #define	TPM_CDEV_PERM_FLAG	0600
 
+
+#define TPM2_START_METHOD_ACPI 2
+#define TPM2_START_METHOD_TIS 6
+#define TPM2_START_METHOD_CRB 7
+#define TPM2_START_METHOD_CRB_ACPI 8
+
 struct tpm_sc {
 	device_t	dev;
 
diff --git a/sys/dev/tpm/tpm_crb.c b/sys/dev/tpm/tpm_crb.c
index d824965b3b92..3643c00f4a36 100644
--- a/sys/dev/tpm/tpm_crb.c
+++ b/sys/dev/tpm/tpm_crb.c
@@ -104,26 +104,21 @@ char *tpmcrb_ids[] = {"MSFT0101", NULL};
 static int
 tpmcrb_acpi_probe(device_t dev)
 {
-	struct resource *res;
-	int rid = 0;
-	uint32_t caps;
+	int err = 0;
+	ACPI_TABLE_TPM23 *tbl;
+	ACPI_STATUS status;
 
 	if (ACPI_ID_PROBE(device_get_parent(dev), dev, tpmcrb_ids) == NULL)
 		return (ENXIO);
 
-	/* Check if device is in CRB mode */
-	res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
-	if (res == NULL)
-		return (ENXIO);
-
-	caps = bus_read_4(res, TPM_CRB_INTF_ID);
-	bus_release_resource(dev, SYS_RES_MEMORY, rid, res);
-
-	if ((caps & TPM_CRB_INTF_ID_TYPE) != TPM_CRB_INTF_ID_TYPE_CRB)
-		return (ENXIO);
+	/*Find TPM2 Header*/
+	status = AcpiGetTable(ACPI_SIG_TPM2, 1, (ACPI_TABLE_HEADER **) &tbl);
+	if(ACPI_FAILURE(status) ||
+	   tbl->StartMethod != TPM2_START_METHOD_CRB)
+		err = ENXIO;
 
 	device_set_desc(dev, "Trusted Platform Module 2.0, CRB mode");
-	return (BUS_PROBE_DEFAULT);
+	return (err);
 }
 
 static ACPI_STATUS
diff --git a/sys/dev/tpm/tpm_tis.c b/sys/dev/tpm/tpm_tis.c
index 9677fc5b9019..a4fa9ee809ad 100644
--- a/sys/dev/tpm/tpm_tis.c
+++ b/sys/dev/tpm/tpm_tis.c
@@ -100,25 +100,20 @@ char *tpmtis_ids[] = {"MSFT0101", NULL};
 static int
 tpmtis_acpi_probe(device_t dev)
 {
-	struct resource *res;
-	int rid = 0;
-	uint32_t caps;
+	int err = 0;
+	ACPI_TABLE_TPM23 *tbl;
+	ACPI_STATUS status;
 
 	if (ACPI_ID_PROBE(device_get_parent(dev), dev, tpmtis_ids) == NULL)
 		return (ENXIO);
-
-	/* Check if device is in TPM 2.0 TIS mode */
-	res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
-	if (res == NULL)
-		return (ENXIO);
-
-	caps = bus_read_4(res, TPM_INTF_CAPS);
-	bus_release_resource(dev, SYS_RES_MEMORY, rid, res);
-	if ((caps & TPM_INTF_CAPS_VERSION) != TPM_INTF_CAPS_TPM20)
-		return (ENXIO);
+	/*Find TPM2 Header*/
+	status = AcpiGetTable(ACPI_SIG_TPM2, 1, (ACPI_TABLE_HEADER **) &tbl);
+	if(ACPI_FAILURE(status) ||
+	   tbl->StartMethod != TPM2_START_METHOD_TIS)
+	    err = ENXIO;
 
 	device_set_desc(dev, "Trusted Platform Module 2.0, FIFO mode");
-	return (BUS_PROBE_DEFAULT);
+	return (err);
 }
 
 static int