diff --git a/plat/hisilicon/hikey/hikey_security.c b/plat/hisilicon/hikey/hikey_security.c
new file mode 100644
index 0000000..2a784e7
--- /dev/null
+++ b/plat/hisilicon/hikey/hikey_security.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <debug.h>
+#include <platform_def.h>
+#include <stdint.h>
+#include <strings.h>
+#include <utils_def.h>
+#include "hikey_private.h"
+
+#define PORTNUM_MAX		5
+
+#define MDDRC_SECURITY_BASE	0xF7121000
+
+struct int_en_reg {
+	unsigned in_en:1;
+	unsigned reserved:31;
+};
+
+struct rgn_map_reg {
+	unsigned rgn_base_addr:24;
+	unsigned rgn_size:6;
+	unsigned reserved:1;
+	unsigned rgn_en:1;
+};
+
+struct rgn_attr_reg {
+	unsigned sp:4;
+	unsigned security_inv:1;
+	unsigned reserved_0:3;
+	unsigned mid_en:1;
+	unsigned mid_inv:1;
+	unsigned reserved_1:6;
+	unsigned rgn_en:1;
+	unsigned subrgn_disable:16;
+};
+
+static volatile struct int_en_reg *get_int_en_reg(uint32_t base)
+{
+	uint64_t addr = base + 0x20;
+	return (struct int_en_reg *)addr;
+}
+
+static volatile struct rgn_map_reg *get_rgn_map_reg(uint32_t base, int region, int port)
+{
+	uint64_t addr = base + 0x100 + 0x10 * region + 0x400 * (uint64_t)port;
+	return (struct rgn_map_reg *)addr;
+}
+
+static volatile struct rgn_attr_reg *get_rgn_attr_reg(uint32_t base, int region,
+					     int port)
+{
+	uint64_t addr = base + 0x104 + 0x10 * region + 0x400 * (uint64_t)port;
+	return (struct rgn_attr_reg *)addr;
+}
+
+/*
+ * Configure secure memory region
+ * region_size must be a power of 2 and at least 64KB
+ * region_base must be region_size aligned
+ */
+static void sec_protect(uint32_t region_base, uint32_t region_size)
+{
+	volatile struct int_en_reg *int_en;
+	volatile struct rgn_map_reg *rgn_map;
+	volatile struct rgn_attr_reg *rgn_attr;
+	uint32_t i = 0;
+
+	assert(!IS_POWER_OF_TWO(region_size) || region_size < 0x10000);
+	/* ensure secure region_base is aligned to region_size */
+	assert((region_base & (region_size - 1)));
+
+	INFO("BL2: TrustZone: protecting %u bytes of memory at 0x%x\n", region_size,
+	     region_base);
+
+	int_en = get_int_en_reg(MDDRC_SECURITY_BASE);
+	int_en->in_en = 0x1;
+
+	for (i = 0; i < PORTNUM_MAX; i++) {
+		rgn_map = get_rgn_map_reg(MDDRC_SECURITY_BASE, 1, i);
+		rgn_attr = get_rgn_attr_reg(MDDRC_SECURITY_BASE, 1, i);
+		rgn_map->rgn_base_addr = region_base >> 16;
+		rgn_attr->subrgn_disable = 0x0;
+		rgn_attr->sp = (i == 3) ? 0xC : 0x0;
+		rgn_map->rgn_size = __builtin_ffs(region_size) - 2;
+		rgn_map->rgn_en = 0x1;
+	}
+}
+
+/*******************************************************************************
+ * Initialize the secure environment.
+ ******************************************************************************/
+void hikey_security_setup(void)
+{
+	sec_protect(DDR_SEC_BASE, DDR_SEC_SIZE);
+}