MIPS: add initial device tree support

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

2 files changed, 63 insertions, 0 deletions

diff --git a/arch/mips/boot/Makefile b/arch/mips/boot/Makefile
index 6b093f1e0e..b865b10f8b 100644
--- a/arch/mips/boot/Makefile
+++ b/arch/mips/boot/Makefile
@@ -1,4 +1,6 @@
 obj-y += start.o
 obj-y += main_entry.o
 
+obj-$(CONFIG_BUILTIN_DTB) += dtb.o
+
 pbl-y += start-pbl.o main_entry-pbl.o
diff --git a/arch/mips/boot/dtb.c b/arch/mips/boot/dtb.c
new file mode 100644
index 0000000000..c1962bfd0c
--- /dev/null
+++ b/arch/mips/boot/dtb.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2013 Antony Pavlov <antonynpavlov@gmail.com>
+ *
+ * Based on arch/arm/cpu/dtb.c:
+ * Copyright (C) 2013 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <common.h>
+#include <init.h>
+#include <of.h>
+#include <memory.h>
+#include <asm/addrspace.h>
+
+void of_add_memory_bank(struct device_node *node, bool dump, int r,
+		u64 base, u64 size)
+{
+	static char str[12];
+
+	sprintf(str, "kseg0_ram%d", r);
+	barebox_add_memory_bank(str, KSEG0 | base, size);
+
+	sprintf(str, "kseg1_ram%d", r);
+	barebox_add_memory_bank(str, KSEG1 | base, size);
+
+	if (dump)
+		pr_info("%s: %s: 0x%llx@0x%llx\n", node->name, str, size, base);
+}
+
+extern char __dtb_start[];
+
+static int of_mips_init(void)
+{
+	struct device_node *root;
+
+	root = of_get_root_node();
+	if (root)
+		return 0;
+
+	root = of_unflatten_dtb(NULL, __dtb_start);
+	if (root) {
+		pr_debug("using internal DTB\n");
+		of_set_root_node(root);
+		if (IS_ENABLED(CONFIG_OFDEVICE))
+			of_probe();
+	}
+
+	return 0;
+}
+core_initcall(of_mips_init);