tpm: Add a basic API implementation for TPMv2

Add support for TPMv2 versions of API functions. So far this is not
complete as the standard is quite large, but it implements everything
currently available for TPMv2 in U-Boot.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

1 files changed, 77 insertions, 7 deletions

diff --git a/lib/tpm_api.c b/lib/tpm_api.c
index 758350b..f155351 100644
--- a/lib/tpm_api.c
+++ b/lib/tpm_api.c
@@ -16,18 +16,41 @@ static bool is_tpm1(struct udevice *dev)
 	return IS_ENABLED(CONFIG_TPM_V1) && tpm_get_version(dev) == TPM_V1;
 }
 
+static bool is_tpm2(struct udevice *dev)
+{
+	return IS_ENABLED(CONFIG_TPM_V2) && tpm_get_version(dev) == TPM_V2;
+}
+
 u32 tpm_startup(struct udevice *dev, enum tpm_startup_type mode)
 {
-	if (is_tpm1(dev))
+	if (is_tpm1(dev)) {
 		return tpm1_startup(dev, mode);
-	else
+	} else if (is_tpm2(dev)) {
+		enum tpm2_startup_types type;
+
+		switch (mode) {
+		case TPM_ST_CLEAR:
+			type = TPM2_SU_CLEAR;
+			break;
+		case TPM_ST_STATE:
+			type = TPM2_SU_STATE;
+			break;
+		default:
+		case TPM_ST_DEACTIVATED:
+			return -EINVAL;
+		}
+		return tpm2_startup(dev, type);
+	} else {
 		return -ENOSYS;
+	}
 }
 
 u32 tpm_resume(struct udevice *dev)
 {
 	if (is_tpm1(dev))
 		return tpm1_startup(dev, TPM_ST_STATE);
+	else if (is_tpm2(dev))
+		return tpm2_startup(dev, TPM2_SU_STATE);
 	else
 		return -ENOSYS;
 }
@@ -36,6 +59,8 @@ u32 tpm_self_test_full(struct udevice *dev)
 {
 	if (is_tpm1(dev))
 		return tpm1_self_test_full(dev);
+	else if (is_tpm2(dev))
+		return tpm2_self_test(dev, TPMI_YES);
 	else
 		return -ENOSYS;
 }
@@ -44,6 +69,8 @@ u32 tpm_continue_self_test(struct udevice *dev)
 {
 	if (is_tpm1(dev))
 		return tpm1_continue_self_test(dev);
+	else if (is_tpm2(dev))
+		return tpm2_self_test(dev, TPMI_NO);
 	else
 		return -ENOSYS;
 }
@@ -71,8 +98,6 @@ u32 tpm_clear_and_reenable(struct udevice *dev)
 			log_err("TPM: Can't set deactivated state\n");
 			return ret;
 		}
-	} else {
-		return -ENOSYS;
 	}
 
 	return TPM_SUCCESS;
@@ -82,6 +107,8 @@ u32 tpm_nv_enable_locking(struct udevice *dev)
 {
 	if (is_tpm1(dev))
 		return tpm1_nv_define_space(dev, TPM_NV_INDEX_LOCK, 0, 0);
+	else if (is_tpm2(dev))
+		return -ENOSYS;
 	else
 		return -ENOSYS;
 }
@@ -90,6 +117,8 @@ u32 tpm_nv_read_value(struct udevice *dev, u32 index, void *data, u32 count)
 {
 	if (is_tpm1(dev))
 		return tpm1_nv_read_value(dev, index, data, count);
+	else if (is_tpm2(dev))
+		return -ENOSYS;
 	else
 		return -ENOSYS;
 }
@@ -99,6 +128,8 @@ u32 tpm_nv_write_value(struct udevice *dev, u32 index, const void *data,
 {
 	if (is_tpm1(dev))
 		return tpm1_nv_write_value(dev, index, data, count);
+	else if (is_tpm2(dev))
+		return -ENOSYS;
 	else
 		return -ENOSYS;
 }
@@ -112,6 +143,8 @@ u32 tpm_write_lock(struct udevice *dev, u32 index)
 {
 	if (is_tpm1(dev))
 		return -ENOSYS;
+	else if (is_tpm2(dev))
+		return -ENOSYS;
 	else
 		return -ENOSYS;
 }
@@ -121,6 +154,9 @@ u32 tpm_pcr_extend(struct udevice *dev, u32 index, const void *in_digest,
 {
 	if (is_tpm1(dev))
 		return tpm1_extend(dev, index, in_digest, out_digest);
+	else if (is_tpm2(dev))
+		return tpm2_pcr_extend(dev, index, TPM2_ALG_SHA256, in_digest,
+				       TPM2_DIGEST_LEN);
 	else
 		return -ENOSYS;
 }
@@ -129,6 +165,8 @@ u32 tpm_pcr_read(struct udevice *dev, u32 index, void *data, size_t count)
 {
 	if (is_tpm1(dev))
 		return tpm1_pcr_read(dev, index, data, count);
+	else if (is_tpm2(dev))
+		return -ENOSYS;
 	else
 		return -ENOSYS;
 }
@@ -137,6 +175,13 @@ u32 tpm_tsc_physical_presence(struct udevice *dev, u16 presence)
 {
 	if (is_tpm1(dev))
 		return tpm1_tsc_physical_presence(dev, presence);
+
+	/*
+	 * Nothing to do on TPM2 for this; use platform hierarchy availability
+	 * instead.
+	 */
+	else if (is_tpm2(dev))
+		return 0;
 	else
 		return -ENOSYS;
 }
@@ -145,6 +190,10 @@ u32 tpm_finalise_physical_presence(struct udevice *dev)
 {
 	if (is_tpm1(dev))
 		return tpm1_finalise_physical_presence(dev);
+
+	/* Nothing needs to be done with tpm2 */
+	else if (is_tpm2(dev))
+		return 0;
 	else
 		return -ENOSYS;
 }
@@ -153,14 +202,18 @@ u32 tpm_read_pubek(struct udevice *dev, void *data, size_t count)
 {
 	if (is_tpm1(dev))
 		return tpm1_read_pubek(dev, data, count);
-	else
+	else if (is_tpm2(dev))
 		return -ENOSYS; /* not implemented yet */
+	else
+		return -ENOSYS;
 }
 
 u32 tpm_force_clear(struct udevice *dev)
 {
 	if (is_tpm1(dev))
 		return tpm1_force_clear(dev);
+	else if (is_tpm2(dev))
+		return tpm2_clear(dev, TPM2_RH_PLATFORM, NULL, 0);
 	else
 		return -ENOSYS;
 }
@@ -169,6 +222,10 @@ u32 tpm_physical_enable(struct udevice *dev)
 {
 	if (is_tpm1(dev))
 		return tpm1_physical_enable(dev);
+
+	/* Nothing needs to be done with tpm2 */
+	else if (is_tpm2(dev))
+		return 0;
 	else
 		return -ENOSYS;
 }
@@ -177,6 +234,10 @@ u32 tpm_physical_disable(struct udevice *dev)
 {
 	if (is_tpm1(dev))
 		return tpm1_physical_disable(dev);
+
+	/* Nothing needs to be done with tpm2 */
+	else if (is_tpm2(dev))
+		return 0;
 	else
 		return -ENOSYS;
 }
@@ -185,6 +246,9 @@ u32 tpm_physical_set_deactivated(struct udevice *dev, u8 state)
 {
 	if (is_tpm1(dev))
 		return tpm1_physical_set_deactivated(dev, state);
+	/* Nothing needs to be done with tpm2 */
+	else if (is_tpm2(dev))
+		return 0;
 	else
 		return -ENOSYS;
 }
@@ -194,6 +258,8 @@ u32 tpm_get_capability(struct udevice *dev, u32 cap_area, u32 sub_cap,
 {
 	if (is_tpm1(dev))
 		return tpm1_get_capability(dev, cap_area, sub_cap, cap, count);
+	else if (is_tpm2(dev))
+		return tpm2_get_capability(dev, cap_area, sub_cap, cap, count);
 	else
 		return -ENOSYS;
 }
@@ -202,14 +268,18 @@ u32 tpm_get_permissions(struct udevice *dev, u32 index, u32 *perm)
 {
 	if (is_tpm1(dev))
 		return tpm1_get_permissions(dev, index, perm);
-	else
+	else if (is_tpm2(dev))
 		return -ENOSYS; /* not implemented yet */
+	else
+		return -ENOSYS;
 }
 
 u32 tpm_get_random(struct udevice *dev, void *data, u32 count)
 {
 	if (is_tpm1(dev))
 		return tpm1_get_random(dev, data, count);
-	else
+	else if (is_tpm2(dev))
 		return -ENOSYS; /* not implemented yet */
+	else
+		return -ENOSYS;
 }