ARM: uniphier: add PH1-LD20 SoC support

This is the first ARMv8 SoC from Socionext Inc.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/mach-uniphier/arm64/smp.S b/arch/arm/mach-uniphier/arm64/smp.S
new file mode 100644
index 0000000..9348ec9
--- /dev/null
+++ b/arch/arm/mach-uniphier/arm64/smp.S
@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <linux/linkage.h>
+
+ENTRY(uniphier_smp_setup)
+	mrs	x0, s3_1_c15_c2_1	/* CPUECTLR_EL1 */
+	orr	x0, x0, #(1 << 6)	/* SMPEN */
+	msr	s3_1_c15_c2_1, x0
+	ret
+ENDPROC(uniphier_smp_setup)
+
+ENTRY(uniphier_secondary_startup)
+	bl	uniphier_smp_setup
+	b	_start
+ENDPROC(uniphier_secondary_startup)