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| author | Maxime Ripard <maxime.ripard@free-electrons.com> | 2012-11-19 18:57:08 +0100 |
|---|---|---|
| committer | Maxime Ripard <maxime.ripard@free-electrons.com> | 2012-11-21 09:25:25 +0100 |
| commit | 67bea88dd842deb3ed8327ad101970dbd615ddcb (patch) | |
| tree | b13cb72433c2289d1c67f3bad7733350fa02de14 /arch/arm/mach-sunxi | |
| parent | ARM: sunxi: Add sun4i and cubieboard support (diff) | |
| download | linux-67bea88dd842deb3ed8327ad101970dbd615ddcb.tar.xz linux-67bea88dd842deb3ed8327ad101970dbd615ddcb.zip | |
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>
Diffstat (limited to 'arch/arm/mach-sunxi')
| -rw-r--r-- | arch/arm/mach-sunxi/sunxi.c | 34 |
1 files changed, 34 insertions, 0 deletions
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 |