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Commit 978577ea authored by Linus Walleij's avatar Linus Walleij
Browse files

ARM: u300: basic device tree support 



This register the most basic peripherals and makes the
U300 boot to prompt from a device tree.

Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 351c2163

Documentation/devicetree/bindings/arm/ste-u300.txt

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ST-Ericsson U300 Device Tree Bindings



For various board the "board" node may contain specific properties

that pertain to this particular board, such as board-specific GPIOs

or board power regulator supplies.



Required root node property:



compatible="stericsson,u300";

arch/arm/boot/dts/Makefile

+1 −0
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@@ -197,6 +197,7 @@ dtb-$(CONFIG_ARCH_TEGRA) += tegra20-harmony.dtb \ 
	tegra114-pluto.dtb

dtb-$(CONFIG_ARCH_VERSATILE) += versatile-ab.dtb \

	versatile-pb.dtb

dtb-$(CONFIG_ARCH_U300) += ste-u300.dtb

dtb-$(CONFIG_ARCH_VEXPRESS) += vexpress-v2p-ca5s.dtb \

	vexpress-v2p-ca9.dtb \

	vexpress-v2p-ca15-tc1.dtb \

arch/arm/boot/dts/ste-u300.dts

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/*

 * Device Tree for the ST-Ericsson U300 Machine and SoC

 */



/dts-v1/;

/include/ "skeleton.dtsi"



/ {

	model = "ST-Ericsson U300";

	compatible = "stericsson,u300";

	#address-cells = <1>;

	#size-cells = <1>;



	chosen {

		bootargs = "root=/dev/ram0 console=ttyAMA0,115200n8 earlyprintk";

	};



	aliases {

		serial0 = &uart0;

		serial1 = &uart1;

        };



	memory {

		reg = <0x48000000 0x03c00000>;

	};



	timer: timer@c0014000 {

		compatible = "stericsson,u300-apptimer";

		reg = <0xc0014000 0x1000>;

		interrupt-parent = <&vica>;

		interrupts = <24 25 26 27>;

	};



	gpio: gpio@c0016000 {

		compatible = "stericsson,gpio-coh901";

		reg = <0xc0016000 0x1000>;

		interrupt-parent = <&vicb>;

		interrupts = <0 1 2 18 21 22 23>;

		interrupt-names = "gpio0", "gpio1", "gpio2", "gpio3",

				"gpio4", "gpio5", "gpio6";

		interrupt-controller;

		#interrupt-cells = <2>;

		gpio-controller;

		#gpio-cells = <2>;

	};



	pinctrl: pinctrl@c0011000 {

		compatible = "stericsson,pinctrl-u300";

		reg = <0xc0011000 0x1000>;

	};



	amba {

		compatible = "arm,amba-bus";

		#address-cells = <1>;

		#size-cells = <1>;

		ranges;



		vica: interrupt-controller@a0001000 {

			compatible = "arm,versatile-vic";

			interrupt-controller;

			#interrupt-cells = <1>;

			reg = <0xa0001000 0x20>;

		};



		vicb: interrupt-controller@a0002000 {

			compatible = "arm,versatile-vic";

			interrupt-controller;

			#interrupt-cells = <1>;

			reg = <0xa0002000 0x20>;

		};



		uart0: serial@c0013000 {

			compatible = "arm,pl011", "arm,primecell";

			reg = <0xc0013000 0x1000>;

			interrupt-parent = <&vica>;

			interrupts = <22>;

		};



		uart1: serial@c0007000 {

			compatible = "arm,pl011", "arm,primecell";

			reg = <0xc0007000 0x1000>;

			interrupt-parent = <&vicb>;

			interrupts = <20>;

		};

	};

};

arch/arm/mach-u300/core.c

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@@ -33,6 +33,9 @@ 
#include <linux/platform_data/pinctrl-coh901.h>

#include <linux/platform_data/dma-coh901318.h>

#include <linux/irqchip/arm-vic.h>

#include <linux/irqchip.h>

#include <linux/of_platform.h>

#include <linux/clocksource.h>



#include <asm/types.h>

#include <asm/setup.h>
@@ -698,3 +701,81 @@ MACHINE_START(U300, "Ericsson AB U335 S335/B335 Prototype Board") 
	.init_machine	= u300_init_machine,

	.restart	= u300_restart,

MACHINE_END



#ifdef CONFIG_OF



/* These are mostly to get the right device names for the clock lookups */

static struct of_dev_auxdata u300_auxdata_lookup[] __initdata = {

	OF_DEV_AUXDATA("stericsson,pinctrl-u300", U300_SYSCON_BASE,

		"pinctrl-u300", NULL),

	OF_DEV_AUXDATA("stericsson,gpio-coh901", U300_GPIO_BASE,

		"u300-gpio", &u300_gpio_plat),

	OF_DEV_AUXDATA("arm,primecell", U300_UART0_BASE,

		"uart0", &uart0_plat_data),

	OF_DEV_AUXDATA("arm,primecell", U300_UART1_BASE,

		"uart1", &uart1_plat_data),

	OF_DEV_AUXDATA("arm,primecell", U300_MMCSD_BASE,

		"mmci", &mmcsd_platform_data),

	{ /* sentinel */ },

};



static void __init u300_init_irq_dt(void)

{

	struct clk *clk;



	/* initialize clocking early, we want to clock the INTCON */

	u300_clk_init(U300_SYSCON_VBASE);



	/* Bootstrap EMIF and SEMI clocks */

	clk = clk_get_sys("pl172", NULL);

	BUG_ON(IS_ERR(clk));

	clk_prepare_enable(clk);

	clk = clk_get_sys("semi", NULL);

	BUG_ON(IS_ERR(clk));

	clk_prepare_enable(clk);



	/* Clock the interrupt controller */

	clk = clk_get_sys("intcon", NULL);

	BUG_ON(IS_ERR(clk));

	clk_prepare_enable(clk);



	irqchip_init();

}



static void __init u300_init_machine_dt(void)

{

	u16 val;



	/* Check what platform we run and print some status information */

	u300_init_check_chip();



	u300_assign_physmem();



	/* Initialize pinmuxing */

	pinctrl_register_mappings(u300_pinmux_map,

				  ARRAY_SIZE(u300_pinmux_map));



	of_platform_populate(NULL, of_default_bus_match_table,

			u300_auxdata_lookup, NULL);



	/* Enable SEMI self refresh */

	val = readw(U300_SYSCON_VBASE + U300_SYSCON_SMCR) |

		U300_SYSCON_SMCR_SEMI_SREFREQ_ENABLE;

	writew(val, U300_SYSCON_VBASE + U300_SYSCON_SMCR);

}



static const char * u300_board_compat[] = {

	"stericsson,u300",

	NULL,

};



DT_MACHINE_START(U300_DT, "U300 S335/B335 (Device Tree)")

	.map_io		= u300_map_io,

	.init_irq	= u300_init_irq_dt,

	.init_time	= clocksource_of_init,

	.init_machine	= u300_init_machine_dt,

	.restart	= u300_restart,

	.dt_compat      = u300_board_compat,

MACHINE_END



#endif /* CONFIG_OF */