watchdog: meson_wdt: use core restart handler

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/notifier.h>

#include <linux/of.h>

#include <linux/platform_device.h>

#include <linux/reboot.h>

#include <linux/types.h>

#include <linux/watchdog.h>

struct meson_wdt_dev {

	struct watchdog_device wdt_dev;

	void __iomem *wdt_base;

	struct notifier_block restart_handler;

};

static int meson_restart_handle(struct notifier_block *this, unsigned long mode,

				void *cmd)

static int meson_wdt_restart(struct watchdog_device *wdt_dev)

{

	struct meson_wdt_dev *meson_wdt = watchdog_get_drvdata(wdt_dev);

	u32 tc_reboot = MESON_WDT_DC_RESET | MESON_WDT_TC_EN;

	struct meson_wdt_dev *meson_wdt = container_of(this,

						       struct meson_wdt_dev,

						       restart_handler);

	while (1) {

		writel(tc_reboot, meson_wdt->wdt_base + MESON_WDT_TC);

		mdelay(5);

	}

	return NOTIFY_DONE;

	return 0;

}

static int meson_wdt_ping(struct watchdog_device *wdt_dev)

	.stop		= meson_wdt_stop,

	.ping		= meson_wdt_ping,

	.set_timeout	= meson_wdt_set_timeout,

	.restart        = meson_wdt_restart,

};

static int meson_wdt_probe(struct platform_device *pdev)

	watchdog_init_timeout(&meson_wdt->wdt_dev, timeout, &pdev->dev);

	watchdog_set_nowayout(&meson_wdt->wdt_dev, nowayout);

	watchdog_set_restart_priority(&meson_wdt->wdt_dev, 128);

	meson_wdt_stop(&meson_wdt->wdt_dev);

	platform_set_drvdata(pdev, meson_wdt);

	meson_wdt->restart_handler.notifier_call = meson_restart_handle;

	meson_wdt->restart_handler.priority = 128;

	err = register_restart_handler(&meson_wdt->restart_handler);

	if (err)

		dev_err(&pdev->dev,

			"cannot register restart handler (err=%d)\n", err);

	dev_info(&pdev->dev, "Watchdog enabled (timeout=%d sec, nowayout=%d)",

		 meson_wdt->wdt_dev.timeout, nowayout);

{

	struct meson_wdt_dev *meson_wdt = platform_get_drvdata(pdev);

	unregister_restart_handler(&meson_wdt->restart_handler);

	watchdog_unregister_device(&meson_wdt->wdt_dev);

	return 0;