arm: octeontx2: Add support for OcteonTX2 SoC platforms

This patch adds support for all OcteonTX2 96xx/95xx
boards from Marvell.
For 96xx boards, use octeontx_96xx_defconfig and
for 95xx boards, use octeontx_95xx_defconfig.

Signed-off-by: Suneel Garapati <sgarapati@marvell.com>

arch/arm/mach-octeontx2/lowlevel_init.S

@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier:    GPL-2.0
+ *
+ * Copyright (C) 2018 Marvell International Ltd.
+ *
+ * https://spdx.org/licenses
+ */
+
+#include <config.h>
+#include <linux/linkage.h>
+#include <asm/macro.h>
+
+.align 8
+.global fdt_base_addr
+fdt_base_addr:
+	.dword 0x0
+
+.global save_boot_params
+save_boot_params:
+	/* Read FDT base from x1 register passed by ATF */
+	adr	x21, fdt_base_addr
+	str	x1, [x21]
+
+	/* Returns */
+	b	save_boot_params_ret
+
+ENTRY(lowlevel_init)
+	mov	x29, lr			/* Save LR */
+
+	/* any lowlevel init should go here */
+
+	mov	lr, x29			/* Restore LR */
+	ret
+ENDPROC(lowlevel_init)