diff --git a/plat/intel/soc/common/include/socfpga_fcs.h b/plat/intel/soc/common/include/socfpga_fcs.h
index d3b7141..a3efd80 100644
--- a/plat/intel/soc/common/include/socfpga_fcs.h
+++ b/plat/intel/soc/common/include/socfpga_fcs.h
@@ -17,17 +17,30 @@
 #define FCS_PROV_DATA_BYTE_SIZE		(FCS_PROV_DATA_WORD_SIZE * 4U)
 #define FCS_SHA384_BYTE_SIZE		(FCS_SHA384_WORD_SIZE * 4U)
 
-#define FCS_CRYPTION_DATA_0		0x10100
+#define FCS_MODE_DECRYPT		0x0
+#define FCS_MODE_ENCRYPT		0x1
+#define FCS_ENCRYPTION_DATA_0		0x10100
+#define FCS_DECRYPTION_DATA_0		0x10102
+#define FCS_OWNER_ID_OFFSET		0xC
 
 /* FCS Payload Structure */
 
-typedef struct fcs_crypt_payload_t {
+typedef struct fcs_encrypt_payload_t {
 	uint32_t first_word;
 	uint32_t src_addr;
 	uint32_t src_size;
 	uint32_t dst_addr;
 	uint32_t dst_size;
-} fcs_crypt_payload;
+} fcs_encrypt_payload;
+
+typedef struct fcs_decrypt_payload_t {
+	uint32_t first_word;
+	uint32_t owner_id[2];
+	uint32_t src_addr;
+	uint32_t src_size;
+	uint32_t dst_addr;
+	uint32_t dst_size;
+} fcs_decrypt_payload;
 
 /* Functions Definitions */
 
@@ -36,9 +49,13 @@
 uint32_t intel_fcs_send_cert(uint64_t addr, uint64_t size,
 				uint32_t *send_id);
 uint32_t intel_fcs_get_provision_data(uint32_t *send_id);
-uint32_t intel_fcs_cryption(uint32_t mode, uint32_t src_addr,
-			uint32_t src_size, uint32_t dst_addr,
-			uint32_t dst_size, uint32_t *send_id);
+uint32_t intel_fcs_encryption(uint32_t src_addr, uint32_t src_size,
+				uint32_t dst_addr, uint32_t dst_size,
+				uint32_t *send_id);
+
+uint32_t intel_fcs_decryption(uint32_t src_addr, uint32_t src_size,
+				uint32_t dst_addr, uint32_t dst_size,
+				uint32_t *send_id);
 
 uint32_t intel_fcs_get_rom_patch_sha384(uint64_t addr, uint64_t *ret_size,
 				uint32_t *mbox_error);