ARM: uniphier: make boot_is_swapped() code optional
The planned new SoC does not have SBC (System Bus Controller) block.
Make boot_is_swapped() an optional hook.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/mach-uniphier/sbc/sbc-boot.c b/arch/arm/mach-uniphier/sbc/sbc-boot.c
new file mode 100644
index 0000000..ec22b45
--- /dev/null
+++ b/arch/arm/mach-uniphier/sbc/sbc-boot.c
@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// Copyright (C) 2011-2014 Panasonic Corporation
+// Copyright (C) 2015-2019 Socionext Inc.
+
+#include <linux/io.h>
+
+#include "sbc-regs.h"
+
+int uniphier_sbc_boot_is_swapped(void)
+{
+ return !(readl(SBBASE0) & SBBASE_BANK_ENABLE);
+}