1 files changed, 57 insertions, 0 deletions
diff --git a/drivers/arm/ethosn/ethosn_big_fw.c b/drivers/arm/ethosn/ethosn_big_fw.c
new file mode 100644
index 0000000..2aad5da
--- /dev/null
+++ b/drivers/arm/ethosn/ethosn_big_fw.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2023, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <common/debug.h>
+
+#include "ethosn_big_fw.h"
+
+/* Magic (FourCC) number to identify the big firmware binary */
+#define ETHOSN_BIG_FW_MAGIC	('E' | ('N' << 8) | ('F' << 16) | ('W' << 24))
+
+/* Supported big firmware version */
+#define ETHOSN_BIG_FW_VERSION_MAJOR	15
+
+#define ETHOSN_ARCH_VER_MAJOR_MASK	U(0xF000)
+#define ETHOSN_ARCH_VER_MAJOR_SHIFT	U(0xC)
+#define ETHOSN_ARCH_VER_MINOR_MASK	U(0xF00)
+#define ETHOSN_ARCH_VER_MINOR_SHIFT	U(0x8)
+#define ETHOSN_ARCH_VER_REV_MASK	U(0xFF)
+
+/* Convert Arm(R) Ethos(TM)-N NPU architecture version to big firmware format */
+#define ETHOSN_BIG_FW_FORMAT_ARCH_VER(arch_ver)					 \
+	(arch_ver & ETHOSN_ARCH_VER_MAJOR_MASK) << ETHOSN_ARCH_VER_MAJOR_SHIFT | \
+	(arch_ver & ETHOSN_ARCH_VER_MINOR_MASK) << ETHOSN_ARCH_VER_MINOR_SHIFT | \
+	(arch_ver & ETHOSN_ARCH_VER_REV_MASK)
+
+
+bool ethosn_big_fw_verify_header(const struct ethosn_big_fw *big_fw,
+				 uint32_t npu_arch_ver)
+{
+	const uint32_t arch_ver = ETHOSN_BIG_FW_FORMAT_ARCH_VER(npu_arch_ver);
+
+	if (big_fw->fw_magic != ETHOSN_BIG_FW_MAGIC) {
+		ERROR("ETHOSN: Unable to find firmware. Invalid magic value: 0x%02x\n",
+		      big_fw->fw_magic);
+
+		return false;
+	}
+
+	if (big_fw->fw_ver_major != ETHOSN_BIG_FW_VERSION_MAJOR) {
+		ERROR("ETHOSN: Unsupported firmware version: %u.%u.%u. Expected Version %u.x.x.\n",
+		      big_fw->fw_ver_major, big_fw->fw_ver_minor,
+		      big_fw->fw_ver_patch, ETHOSN_BIG_FW_VERSION_MAJOR);
+
+		return false;
+	}
+
+	if (big_fw->arch_min > arch_ver || arch_ver > big_fw->arch_max) {
+		ERROR("ETHOSN: Firmware is not compatbile with architecture version: 0x%02x\n",
+		      npu_arch_ver);
+		return false;
+	}
+
+	return true;
+}