arm64: mvebu: do not map firmware RT service region

There is region left by ATF, which needs to remain in memory to provide RT
services. To prevent overwriting it by u-boot, do not provide any mapping
for this memory region, so any attempt to access it will trigger
synchronous exception.

Update sr 2021-04-12:
Don't update armada3700/cpu.c mmu table, as this has specific changes
included in mainline.
Signed-off-by: NGrzegorz Jaszczyk <jaz@semihalf.com>
Signed-off-by: NStefan Roese <sr@denx.de>

arch/arm/mach-mvebu/armada8k/cpu.c

@@ -14,6 +14,7 @@
 #include <asm/arch/cpu.h>
 #include <asm/arch/soc.h>
 #include <asm/armv8/mmu.h>
+#include <mach/fw_info.h>
 
 /* Armada 7k/8k */
 #define MVEBU_RFU_BASE			(MVEBU_REGISTER(0x6f0000))
@@ -27,9 +28,18 @@
 static struct mm_region mvebu_mem_map[] = {
 	/* Armada 80x0 memory regions include the CP1 (slave) units */
 	{
-		/* RAM */
+		/* RAM 0-64MB */
 		.phys = 0x0UL,
 		.virt = 0x0UL,
+		.size = ATF_REGION_START,
+		.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
+			 PTE_BLOCK_INNER_SHARE
+	},
+	/* ATF and TEE region 0x4000000-0x5400000 not mapped */
+	{
+		/* RAM 66MB-2GB */
+		.phys = ATF_REGION_END,
+		.virt = ATF_REGION_END,
 		.size = SZ_2G,
 		.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
 			 PTE_BLOCK_INNER_SHARE

arch/arm/mach-mvebu/include/mach/fw_info.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2018 Marvell International Ltd.
+ */
+
+#ifndef _FW_INFO_H_
+#define _FW_INFO_H_
+
+/* Protected ATF and TEE region */
+#define ATF_REGION_START		0x4000000
+#define ATF_REGION_END			0x5400000
+
+#endif /* _FW_INFO_H_ */