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Commit c631f200 authored by Andrew Bresticker's avatar Andrew Bresticker Committed by Wim Van Sebroeck
Browse files

watchdog: imgpdc: Add reboot support 



Register a restart handler that will restart the system by writing
to the watchdog's SOFT_RESET register.

Signed-off-by: default avatarAndrew Bresticker <abrestic@chromium.org>
Reviewed-by: default avatarEzequiel Garcia <ezequiel.garcia@imgtec.com>
Tested-by: default avatarEzequiel Garcia <ezequiel.garcia@imgtec.com>
Cc: James Hogan <james.hogan@imgtec.com>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent 8aa453a5

drivers/watchdog/imgpdc_wdt.c

+21 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/log2.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/reboot.h>

#include <linux/slab.h>

#include <linux/watchdog.h>
@@ -57,6 +58,7 @@ struct pdc_wdt_dev { 
	struct clk *wdt_clk;

	struct clk *sys_clk;

	void __iomem *base;

	struct notifier_block restart_handler;

};



static int pdc_wdt_keepalive(struct watchdog_device *wdt_dev)
@@ -136,6 +138,18 @@ static const struct watchdog_ops pdc_wdt_ops = { 
	.set_timeout	= pdc_wdt_set_timeout,

};



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

			   void *cmd)

{

	struct pdc_wdt_dev *wdt = container_of(this, struct pdc_wdt_dev,

					       restart_handler);



	/* Assert SOFT_RESET */

	writel(0x1, wdt->base + PDC_WDT_SOFT_RESET);



	return NOTIFY_OK;

}



static int pdc_wdt_probe(struct platform_device *pdev)

{

	int ret, val;
@@ -242,6 +256,13 @@ static int pdc_wdt_probe(struct platform_device *pdev) 
	if (ret)

		goto disable_wdt_clk;



	pdc_wdt->restart_handler.notifier_call = pdc_wdt_restart;

	pdc_wdt->restart_handler.priority = 128;

	ret = register_restart_handler(&pdc_wdt->restart_handler);

	if (ret)

		dev_warn(&pdev->dev, "failed to register restart handler: %d\n",

			 ret);



	return 0;



disable_wdt_clk: