ARM: ux500: Initial Device Tree support for Snowball

This provides very basic Device Tree support for ST-Ericsson's
low-cost development platform, Snowball. If Device Tree for
ux500 is enabled and the correct board is configured within the
Device Tree blob, the correct *_init_machine() will be called.

This patch is based on some original work completed by:
  Niklas Hernaeus <niklas.hernaeus@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Niklas Hernaeus <niklas.hernaeus@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/boot/dts/snowball.dts

+/*
+ * Copyright 2011 ST-Ericsson AB
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+/dts-v1/;
+
+/ {
+	model = "Calao Systems Snowball platform with device tree";
+	compatible = "calaosystems,snowball-a9500";
+
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	memory {
+		reg = <0x00000000 0x20000000>;
+	};
+
+	soc-u9500 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "simple-bus";
+		ranges;
+	};
+};

arch/arm/mach-ux500/Makefile.boot

@@ -2,3 +2,4 @@
 params_phys-y	:= 0x00000100
 initrd_phys-y	:= 0x00800000
 
+dtb-$(CONFIG_MACH_SNOWBALL) += snowball.dtb

arch/arm/mach-ux500/board-mop500.c

@@ -30,6 +30,9 @@
 #include <linux/gpio_keys.h>
 #include <linux/delay.h>
 
+#include <linux/of.h>
+#include <linux/of_platform.h>
+
 #include <linux/leds.h>
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
@@ -738,3 +741,34 @@ MACHINE_START(SNOWBALL, "Calao Systems Snowball platform")
 	.handle_irq	= gic_handle_irq,
 	.init_machine	= snowball_init_machine,
 MACHINE_END
+
+#ifdef CONFIG_MACH_UX500_DT
+static void __init u8500_init_machine(void)
+{
+	if (of_machine_is_compatible("calaosystems,snowball-a9500"))
+		return snowball_init_machine();
+	else if (of_machine_is_compatible("st-ericsson,hrefv60+"))
+		return hrefv60_init_machine();
+	else if (of_machine_is_compatible("st-ericsson,mop500"))
+		return mop500_init_machine();
+}
+
+static const char * u8500_dt_board_compat[] = {
+	"calaosystems,snowball-a9500",
+	"st-ericsson,hrefv60+",
+	"st-ericsson,u8500",
+	"st-ericsson,mop500",
+	NULL,
+};
+
+
+DT_MACHINE_START(U8500_DT, "ST-Ericsson U8500 platform (Device Tree Support)")
+	.map_io		= u8500_map_io,
+	.init_irq	= ux500_init_irq,
+	/* we re-use nomadik timer here */
+	.timer		= &ux500_timer,
+	.handle_irq	= gic_handle_irq,
+	.init_machine	= u8500_init_machine,
+	.dt_compat      = u8500_dt_board_compat,
+MACHINE_END
+#endif