ARM: davinci: da850: add DT boot support

Add support for booting DA850 using flattened device
tree to describe the hardware. At this time only the
very basic bootup using a serial console is supported.
Signed-off-by: NSekhar Nori <nsekhar@ti.com>

Documentation/devicetree/bindings/arm/davinci.txt

+Texas Instruments DaVinci Platforms Device Tree Bindings
+--------------------------------------------------------
+
+Generic DaVinci Boards
+----------------------
+
+DA850/OMAP-L138/AM18x generic board
+Required root node properties:
+    - compatible = "ti,da850";

arch/arm/Kconfig

@@ -924,6 +924,7 @@ config ARCH_DAVINCI
 	select GENERIC_IRQ_CHIP
 	select HAVE_IDE
 	select NEED_MACH_GPIO_H
+	select USE_OF
 	select ZONE_DMA
 	help
 	  Support for TI's DaVinci platform.

arch/arm/mach-davinci/Kconfig

@@ -58,6 +58,14 @@ config ARCH_DAVINCI_TNETV107X
 
 comment "DaVinci Board Type"
 
+config MACH_DA8XX_DT
+	bool "Support DA8XX platforms using device tree"
+	default y
+	depends on ARCH_DAVINCI_DA8XX
+	help
+	  Say y here to include support for TI DaVinci DA850 based using
+	  Flattened Device Tree. More information at Documentation/devicetree
+
 config MACH_DAVINCI_EVM
 	bool "TI DM644x EVM"
 	default ARCH_DAVINCI_DM644x

arch/arm/mach-davinci/Makefile

@@ -22,6 +22,7 @@ obj-$(CONFIG_AINTC)			+= irq.o
 obj-$(CONFIG_CP_INTC)			+= cp_intc.o
 
 # Board specific
+obj-$(CONFIG_MACH_DA8XX_DT)		+= da8xx-dt.o
 obj-$(CONFIG_MACH_DAVINCI_EVM)  	+= board-dm644x-evm.o
 obj-$(CONFIG_MACH_SFFSDR)		+= board-sffsdr.o
 obj-$(CONFIG_MACH_NEUROS_OSD2)		+= board-neuros-osd2.o

arch/arm/mach-davinci/da8xx-dt.c

+/*
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * Modified from mach-omap/omap2/board-generic.c
+ *
+ * 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/io.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/irqdomain.h>
+
+#include <asm/mach/arch.h>
+
+#include <mach/common.h>
+#include <mach/cp_intc.h>
+#include <mach/da8xx.h>
+
+#define DA8XX_NUM_UARTS	3
+
+void __init da8xx_uart_clk_enable(void)
+{
+	int i;
+	for (i = 0; i < DA8XX_NUM_UARTS; i++)
+		davinci_serial_setup_clk(i, NULL);
+}
+
+static struct of_device_id da8xx_irq_match[] __initdata = {
+	{ .compatible = "ti,cp-intc", .data = cp_intc_of_init, },
+	{ }
+};
+
+static void __init da8xx_init_irq(void)
+{
+	of_irq_init(da8xx_irq_match);
+}
+
+#ifdef CONFIG_ARCH_DAVINCI_DA850
+
+static void __init da850_init_machine(void)
+{
+	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+
+	da8xx_uart_clk_enable();
+}
+
+static const char *da850_boards_compat[] __initdata = {
+	"ti,da850",
+	NULL,
+};
+
+DT_MACHINE_START(DA850_DT, "Generic DA850/OMAP-L138/AM18x")
+	.map_io		= da850_init,
+	.init_irq	= da8xx_init_irq,
+	.timer		= &davinci_timer,
+	.init_machine	= da850_init_machine,
+	.dt_compat	= da850_boards_compat,
+	.init_late	= davinci_init_late,
+	.restart	= da8xx_restart,
+MACHINE_END
+
+#endif