1 files changed, 67 insertions, 0 deletions
diff --git a/arch/arm/mach-uniphier/base-address.c b/arch/arm/mach-uniphier/base-address.c
new file mode 100644
index 00000000000..5ee742e363f
--- /dev/null
+++ b/arch/arm/mach-uniphier/base-address.c
@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Copyright (C) 2019 Socionext Inc.
+//   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
+
+#include <common.h>
+#include <dm/of.h>
+#include <fdt_support.h>
+#include <linux/io.h>
+#include <linux/libfdt.h>
+#include <linux/sizes.h>
+#include <asm/global_data.h>
+
+#include "base-address.h"
+#include "sc64-regs.h"
+#include "sg-regs.h"
+
+/*
+ * Dummy initializers are needed to allocate these to .data section instead of
+ * .bss section. The .bss section is unusable before relocation because the
+ * .bss section and DT share the same address. Without the initializers,
+ * DT would be broken.
+ */
+void __iomem *sc_base = (void *)0xdeadbeef;
+void __iomem *sg_base = (void *)0xdeadbeef;
+
+static u64 uniphier_base_address_get(const char *compat_tail)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+	const void *fdt = gd->fdt_blob;
+	int offset, len, i;
+	const char *str;
+
+	for (offset = fdt_next_node(fdt, 0, NULL);
+	     offset >= 0;
+	     offset = fdt_next_node(fdt, offset, NULL)) {
+		for (i = 0;
+		     (str = fdt_stringlist_get(fdt, offset, "compatible", i, &len));
+		     i++) {
+			if (!memcmp(compat_tail,
+				    str + len - strlen(compat_tail),
+				    strlen(compat_tail)))
+				return fdt_get_base_address(fdt, offset);
+		}
+	}
+
+	return OF_BAD_ADDR;
+}
+
+int uniphier_base_address_init(void)
+{
+	u64 base;
+
+	base = uniphier_base_address_get("-soc-glue");
+	if (base == OF_BAD_ADDR)
+		return -EINVAL;
+
+	sg_base = ioremap(base, SZ_8K);
+
+	base = uniphier_base_address_get("-sysctrl");
+	if (base == OF_BAD_ADDR)
+		return -EINVAL;
+
+	sc_base = ioremap(base, SZ_64K);
+
+	return 0;
+}