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Commit 9ab45f3f authored by Alexandre Belloni's avatar Alexandre Belloni Committed by Nicolas Ferre
Browse files

watchdog: at91rm9200: implement restart handler 



Restarting the at91rm9200 is done through programming the watchdog and waiting
for it to reset.

Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
parent 8432f9e5

drivers/watchdog/at91rm9200_wdt.c

+32 −0
Original line number Original line Diff line number Diff line
@@ -12,6 +12,7 @@ 
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt





#include <linux/bitops.h>

#include <linux/bitops.h>

#include <linux/delay.h>

#include <linux/errno.h>

#include <linux/errno.h>

#include <linux/fs.h>

#include <linux/fs.h>

#include <linux/init.h>

#include <linux/init.h>
@@ -23,6 +24,7 @@ 
#include <linux/module.h>

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/moduleparam.h>

#include <linux/platform_device.h>

#include <linux/platform_device.h>

#include <linux/reboot.h>

#include <linux/regmap.h>

#include <linux/regmap.h>

#include <linux/types.h>

#include <linux/types.h>

#include <linux/watchdog.h>

#include <linux/watchdog.h>
@@ -53,6 +55,27 @@ static unsigned long at91wdt_busy; 




/* ......................................................................... */

/* ......................................................................... */





static int at91rm9200_restart(struct notifier_block *this,

					unsigned long mode, void *cmd)

{

	/*

	 * Perform a hardware reset with the use of the Watchdog timer.

	 */

	regmap_write(regmap_st, AT91_ST_WDMR,

		     AT91_ST_RSTEN | AT91_ST_EXTEN | 1);

	regmap_write(regmap_st, AT91_ST_CR, AT91_ST_WDRST);



	mdelay(2000);



	pr_emerg("Unable to restart system\n");

	return NOTIFY_DONE;

}



static struct notifier_block at91rm9200_restart_nb = {

	.notifier_call = at91rm9200_restart,

	.priority = 192,

};



/*

/*

 * Disable the watchdog.

 * Disable the watchdog.

 */

 */
@@ -228,6 +251,10 @@ static int at91wdt_probe(struct platform_device *pdev) 
	if (res)

	if (res)

		return res;

		return res;





	res = register_restart_handler(&at91rm9200_restart_nb);

	if (res)

		dev_warn(dev, "failed to register restart handler\n");



	pr_info("AT91 Watchdog Timer enabled (%d seconds%s)\n",

	pr_info("AT91 Watchdog Timer enabled (%d seconds%s)\n",

		wdt_time, nowayout ? ", nowayout" : "");

		wdt_time, nowayout ? ", nowayout" : "");

	return 0;

	return 0;
@@ -235,8 +262,13 @@ static int at91wdt_probe(struct platform_device *pdev) 




static int at91wdt_remove(struct platform_device *pdev)

static int at91wdt_remove(struct platform_device *pdev)

{

{

	struct device *dev = &pdev->dev;

	int res;

	int res;





	res = unregister_restart_handler(&at91rm9200_restart_nb);

	if (res)

		dev_warn(dev, "failed to unregister restart handler\n");



	res = misc_deregister(&at91wdt_miscdev);

	res = misc_deregister(&at91wdt_miscdev);

	if (!res)

	if (!res)

		at91wdt_miscdev.parent = NULL;

		at91wdt_miscdev.parent = NULL;