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ARM: sunxi: Add sunxi restart function via onchip watchdog

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Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
This commit is contained in:
Maxime Ripard 2012-11-19 18:57:08 +01:00
parent f055f1f682
commit 67bea88dd8
3 changed files with 53 additions and 1 deletions
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13
Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt Normal file
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@ -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>;
};

7
arch/arm/boot/dts/sunxi.dtsi
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@ -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>;

34
arch/arm/mach-sunxi/sunxi.c
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@ -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