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Commit 67bea88d authored by Maxime Ripard's avatar Maxime Ripard
Browse files

ARM: sunxi: Add sunxi restart function via onchip watchdog 



Signed-off-by: default avatarStefan Roese <sr@denx.de>
Signed-off-by: default avatarMaxime Ripard <maxime.ripard@free-electrons.com>
parent f055f1f6

Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt

0 → 100644
+13 −0
Original line number Diff line number Diff line 
Allwinner sunXi Watchdog timer



Required properties:



- compatible : should be "allwinner,sunxi-wdt"

- reg : Specifies base physical address and size of the registers.



Example:



wdt: watchdog@01c20c90 {

	compatible = "allwinner,sunxi-wdt";

	reg = <0x01c20c90 0x10>;

};

arch/arm/boot/dts/sunxi.dtsi

+6 −1
Original line number Diff line number Diff line
@@ -42,11 +42,16 @@ 


		timer@01c20c00 {

			compatible = "allwinner,sunxi-timer";

			reg = <0x01c20c00 0x400>;

			reg = <0x01c20c00 0x90>;

			interrupts = <22>;

			clocks = <&osc>;

		};



		wdt: watchdog@01c20c90 {

			compatible = "allwinner,sunxi-wdt";

			reg = <0x01c20c90 0x10>;

		};



		intc: interrupt-controller@01c20400 {

			compatible = "allwinner,sunxi-ic";

			reg = <0x01c20400 0x400>;

arch/arm/mach-sunxi/sunxi.c

+34 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 


#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/of_address.h>

#include <linux/of_irq.h>

#include <linux/of_platform.h>

#include <linux/io.h>
@@ -26,6 +27,36 @@ 


#include "sunxi.h"



#define WATCHDOG_CTRL_REG	0x00

#define WATCHDOG_MODE_REG	0x04



static void __iomem *wdt_base;



static void sunxi_setup_restart(void)

{

	struct device_node *np = of_find_compatible_node(NULL, NULL,

						"allwinner,sunxi-wdt");

	if (WARN(!np, "unable to setup watchdog restart"))

		return;



	wdt_base = of_iomap(np, 0);

	WARN(!wdt_base, "failed to map watchdog base address");

}



static void sunxi_restart(char mode, const char *cmd)

{

	if (!wdt_base)

		return;



	/* Enable timer and set reset bit in the watchdog */

	writel(3, wdt_base + WATCHDOG_MODE_REG);

	writel(0xa57 << 1 | 1, wdt_base + WATCHDOG_CTRL_REG);

	while(1) {

		mdelay(5);

		writel(3, wdt_base + WATCHDOG_MODE_REG);

	}

}



static struct map_desc sunxi_io_desc[] __initdata = {

	{

		.virtual	= (unsigned long) SUNXI_REGS_VIRT_BASE,
@@ -42,6 +73,8 @@ void __init sunxi_map_io(void) 


static void __init sunxi_dt_init(void)

{

	sunxi_setup_restart();



	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);

}
@@ -56,6 +89,7 @@ DT_MACHINE_START(SUNXI_DT, "Allwinner A1X (Device Tree)") 
	.map_io		= sunxi_map_io,

	.init_irq	= sunxi_init_irq,

	.handle_irq	= sunxi_handle_irq,

	.restart	= sunxi_restart,

	.timer		= &sunxi_timer,

	.dt_compat	= sunxi_board_dt_compat,

MACHINE_END