diff --git a/include/drivers/arm/ethosn.h b/include/drivers/arm/ethosn.h
new file mode 100644
index 0000000..6de2abb
--- /dev/null
+++ b/include/drivers/arm/ethosn.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2021, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef ETHOSN_H
+#define ETHOSN_H
+
+#include <lib/smccc.h>
+
+/* Function numbers */
+#define ETHOSN_FNUM_VERSION		U(0x50)
+#define ETHOSN_FNUM_IS_SEC		U(0x51)
+#define ETHOSN_FNUM_HARD_RESET		U(0x52)
+#define ETHOSN_FNUM_SOFT_RESET		U(0x53)
+/* 0x54-0x5F reserved for future use */
+
+/* SMC64 function IDs */
+#define ETHOSN_FID_64(func_num)		U(0xC2000000 | func_num)
+#define ETHOSN_FID_VERSION_64		ETHOSN_FID_64(ETHOSN_FNUM_VERSION)
+#define ETHOSN_FID_IS_SEC_64		ETHOSN_FID_64(ETHOSN_FNUM_IS_SEC)
+#define ETHOSN_FID_HARD_RESET_64	ETHOSN_FID_64(ETHOSN_FNUM_HARD_RESET)
+#define ETHOSN_FID_SOFT_RESET_64	ETHOSN_FID_64(ETHOSN_FNUM_SOFT_RESET)
+
+/* SMC32 function IDs */
+#define ETHOSN_FID_32(func_num)		U(0x82000000 | func_num)
+#define ETHOSN_FID_VERSION_32		ETHOSN_FID_32(ETHOSN_FNUM_VERSION)
+#define ETHOSN_FID_IS_SEC_32		ETHOSN_FID_32(ETHOSN_FNUM_IS_SEC)
+#define ETHOSN_FID_HARD_RESET_32	ETHOSN_FID_32(ETHOSN_FNUM_HARD_RESET)
+#define ETHOSN_FID_SOFT_RESET_32	ETHOSN_FID_32(ETHOSN_FNUM_SOFT_RESET)
+
+#define ETHOSN_NUM_SMC_CALLS	8
+
+/* Macro to identify function calls */
+#define ETHOSN_FID_MASK		U(0xFFF0)
+#define ETHOSN_FID_VALUE	U(0x50)
+#define is_ethosn_fid(_fid) (((_fid) & ETHOSN_FID_MASK) == ETHOSN_FID_VALUE)
+
+/* Service version  */
+#define ETHOSN_VERSION_MAJOR U(0)
+#define ETHOSN_VERSION_MINOR U(1)
+
+/* Return codes for function calls */
+#define ETHOSN_SUCCESS			 0
+#define ETHOSN_NOT_SUPPORTED		-1
+/* -2 Reserved for NOT_REQUIRED */
+/* -3 Reserved for INVALID_PARAMETER */
+#define ETHOSN_FAILURE			-4
+#define ETHOSN_CORE_IDX_OUT_OF_RANGE	-5
+
+uintptr_t ethosn_smc_handler(uint32_t smc_fid,
+			     u_register_t core_idx,
+			     u_register_t x2,
+			     u_register_t x3,
+			     u_register_t x4,
+			     void *cookie,
+			     void *handle,
+			     u_register_t flags);
+
+#endif  /* ETHOSN_H */