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| author | Maxime Ripard <maxime.ripard@free-electrons.com> | 2012-11-19 21:57:08 +0400 |
|---|---|---|
| committer | Maxime Ripard <maxime.ripard@free-electrons.com> | 2012-11-21 12:25:25 +0400 |
| commit | 67bea88dd842deb3ed8327ad101970dbd615ddcb (patch) | |
| tree | b13cb72433c2289d1c67f3bad7733350fa02de14 | |
| parent | f055f1f682b84b3b785813f5c11efacab6001253 (diff) | |
| download | linux-67bea88dd842deb3ed8327ad101970dbd615ddcb.tar.xz | |
ARM: sunxi: Add sunxi restart function via onchip watchdog
Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
| -rw-r--r-- | Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt | 13 | ||||
| -rw-r--r-- | arch/arm/boot/dts/sunxi.dtsi | 7 | ||||
| -rw-r--r-- | arch/arm/mach-sunxi/sunxi.c | 34 |
3 files changed, 53 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt b/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt new file mode 100644 index 000000000000..0b2717775600 --- /dev/null +++ b/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt @@ -0,0 +1,13 @@ +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>; +}; diff --git a/arch/arm/boot/dts/sunxi.dtsi b/arch/arm/boot/dts/sunxi.dtsi index 8284fbd7ddab..8bbc2bfef221 100644 --- a/arch/arm/boot/dts/sunxi.dtsi +++ b/arch/arm/boot/dts/sunxi.dtsi @@ -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>; diff --git a/arch/arm/mach-sunxi/sunxi.c b/arch/arm/mach-sunxi/sunxi.c index 13d4d96cbc85..dc634ae2081f 100644 --- a/arch/arm/mach-sunxi/sunxi.c +++ b/arch/arm/mach-sunxi/sunxi.c @@ -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 |