[PATCH 2/7] arm-dt: Allow CONFIG_OF on ARM

[grant.likely@secretlab.ca (Grant Likely)]

From: Jeremy Kerr <jeremy.kerr@canonical.com>

Add some basic empty infrastructure for DT support on ARM.

Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
---

 arch/arm/Kconfig            |    6 ++++++
 arch/arm/include/asm/prom.h |   19 +++++++++++++++++++
 arch/arm/kernel/Makefile    |    1 +
 arch/arm/kernel/devtree.c   |   34 ++++++++++++++++++++++++++++++++++
 4 files changed, 60 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/include/asm/prom.h
 create mode 100644 arch/arm/kernel/devtree.c

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 4c33ca8..5a8edc2 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1258,6 +1258,12 @@ endmenu
 
 menu "Boot options"
 
+config OF
+	bool "Device tree support"
+	select OF_FLATTREE
+	help
+	  Support for OpenFirmware-style device trees
+
 # Compressed boot loader in ROM.  Yes, we really want to ask about
 # TEXT and BSS so we preserve their values in the config files.
 config ZBOOT_ROM_TEXT
diff --git a/arch/arm/include/asm/prom.h b/arch/arm/include/asm/prom.h
new file mode 100644
index 0000000..20b42fb
--- /dev/null
+++ b/arch/arm/include/asm/prom.h
@@ -0,0 +1,19 @@
+/*
+ *  arch/arm/include/asm/prom.h
+ *
+ *  Copyright (C) 2009 Canonical Ltd. <jeremy.kerr@canonical.com>
+ *
+ * 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.
+ *
+ */
+#ifndef __ASMARM_PROM_H
+#define __ASMARM_PROM_H
+
+#include <asm/setup.h>
+
+/* _ALIGN expects upwards alignment */
+#define _ALIGN(addr, size)		(((addr)+((size)-1))&(~((size)-1)))
+
+#endif
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index dd00f74..35c8bdf 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -38,6 +38,7 @@ obj-$(CONFIG_ARM_THUMBEE)	+= thumbee.o
 obj-$(CONFIG_KGDB)		+= kgdb.o
 obj-$(CONFIG_ARM_UNWIND)	+= unwind.o
 obj-$(CONFIG_HAVE_TCM)		+= tcm.o
+obj-$(CONFIG_OF)		+= devtree.o
 
 obj-$(CONFIG_CRUNCH)		+= crunch.o crunch-bits.o
 AFLAGS_crunch-bits.o		:= -Wa,-mcpu=ep9312
diff --git a/arch/arm/kernel/devtree.c b/arch/arm/kernel/devtree.c
new file mode 100644
index 0000000..5909d08
--- /dev/null
+++ b/arch/arm/kernel/devtree.c
@@ -0,0 +1,34 @@
+/*
+ *  linux/arch/arm/kernel/devtree.c
+ *
+ *  Copyright (C) 2009 Canonical Ltd. <jeremy.kerr@canonical.com>
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/bootmem.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+
+#include <asm/setup.h>
+#include <asm/page.h>
+
+void __init early_init_dt_add_memory_arch(u64 base, u64 size)
+{
+	arm_add_memory(base, size);
+}
+
+u64 __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
+{
+	return __pa(__alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS)));
+}
+
+void early_init_dt_scan_chosen_arch(unsigned long node) { }
+
+void early_init_dt_setup_initrd_arch(unsigned long start,
+					    unsigned long end) { }