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: Sekhar Nori <nsekhar@ti.com>

diff --git a/Documentation/devicetree/bindings/arm/davinci.txt b/Documentation/devicetree/bindings/arm/davinci.txt
new file mode 100644 (file)
index 0000000..aa4e7a1
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/davinci.txt
@@ -0,0 +1,9 @@
+Texas Instruments DaVinci Platforms Device Tree Bindings
+--------------------------------------------------------
+
+Generic DaVinci Boards
+----------------------
+
+DA850/OMAP-L138/AM18x generic board
+Required root node properties:
+    - compatible = "ti,da850";

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 73067efd484530d4021a220fecce329b4752b3c0..06e0adf2368eb769d4fcca6054e988bcf272821c 100644 (file)
--- a/arch/arm/Kconfig
+++ b/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.

diff --git a/arch/arm/mach-davinci/Kconfig b/arch/arm/mach-davinci/Kconfig
index f8eecb9594132b73375cc9fbe578159755005405..0153950f606806e77eca03b622c2961438221129 100644 (file)
--- a/arch/arm/mach-davinci/Kconfig
+++ b/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

diff --git a/arch/arm/mach-davinci/Makefile b/arch/arm/mach-davinci/Makefile
index 2227effcb0e98bdea4968b95617e06cf3c0b5f39..fb5c1aa98a63ed1d4c0ec1fb9ccff1be6172948e 100644 (file)
--- a/arch/arm/mach-davinci/Makefile
+++ b/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

diff --git a/arch/arm/mach-davinci/da8xx-dt.c b/arch/arm/mach-davinci/da8xx-dt.c
new file mode 100644 (file)
index 0000000..df393d9
--- /dev/null
+++ b/arch/arm/mach-davinci/da8xx-dt.c
@@ -0,0 +1,64 @@
+/*
+ * 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