1be7f5520a
That code used to be in the machine code, but it's more fit here with other restart hooks. That will allow to cleanup the machine directory, while waiting for a proper watchdog driver for the A31. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
/*
|
|
* Allwinner A31 SoCs reset code
|
|
*
|
|
* Copyright (C) 2012-2014 Maxime Ripard
|
|
*
|
|
* Maxime Ripard <maxime.ripard@free-electrons.com>
|
|
*
|
|
* This file is licensed under the terms of the GNU General Public
|
|
* License version 2. This program is licensed "as is" without any
|
|
* warranty of any kind, whether express or implied.
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/io.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/reboot.h>
|
|
|
|
#include <asm/system_misc.h>
|
|
|
|
#define SUN6I_WATCHDOG1_IRQ_REG 0x00
|
|
#define SUN6I_WATCHDOG1_CTRL_REG 0x10
|
|
#define SUN6I_WATCHDOG1_CTRL_RESTART BIT(0)
|
|
#define SUN6I_WATCHDOG1_CONFIG_REG 0x14
|
|
#define SUN6I_WATCHDOG1_CONFIG_RESTART BIT(0)
|
|
#define SUN6I_WATCHDOG1_CONFIG_IRQ BIT(1)
|
|
#define SUN6I_WATCHDOG1_MODE_REG 0x18
|
|
#define SUN6I_WATCHDOG1_MODE_ENABLE BIT(0)
|
|
|
|
static void __iomem *wdt_base;
|
|
|
|
static void sun6i_wdt_restart(enum reboot_mode mode, const char *cmd)
|
|
{
|
|
if (!wdt_base)
|
|
return;
|
|
|
|
/* Disable interrupts */
|
|
writel(0, wdt_base + SUN6I_WATCHDOG1_IRQ_REG);
|
|
|
|
/* We want to disable the IRQ and just reset the whole system */
|
|
writel(SUN6I_WATCHDOG1_CONFIG_RESTART,
|
|
wdt_base + SUN6I_WATCHDOG1_CONFIG_REG);
|
|
|
|
/* Enable timer. The default and lowest interval value is 0.5s */
|
|
writel(SUN6I_WATCHDOG1_MODE_ENABLE,
|
|
wdt_base + SUN6I_WATCHDOG1_MODE_REG);
|
|
|
|
/* Restart the watchdog. */
|
|
writel(SUN6I_WATCHDOG1_CTRL_RESTART,
|
|
wdt_base + SUN6I_WATCHDOG1_CTRL_REG);
|
|
|
|
while (1) {
|
|
mdelay(5);
|
|
writel(SUN6I_WATCHDOG1_MODE_ENABLE,
|
|
wdt_base + SUN6I_WATCHDOG1_MODE_REG);
|
|
}
|
|
}
|
|
|
|
static int sun6i_reboot_probe(struct platform_device *pdev)
|
|
{
|
|
wdt_base = of_iomap(pdev->dev.of_node, 0);
|
|
if (!wdt_base) {
|
|
WARN(1, "failed to map watchdog base address");
|
|
return -ENODEV;
|
|
}
|
|
|
|
arm_pm_restart = sun6i_wdt_restart;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct of_device_id sun6i_reboot_of_match[] = {
|
|
{ .compatible = "allwinner,sun6i-a31-wdt" },
|
|
{}
|
|
};
|
|
|
|
static struct platform_driver sun6i_reboot_driver = {
|
|
.probe = sun6i_reboot_probe,
|
|
.driver = {
|
|
.name = "sun6i-reboot",
|
|
.of_match_table = sun6i_reboot_of_match,
|
|
},
|
|
};
|
|
module_platform_driver(sun6i_reboot_driver);
|