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watchdog: imx2: Convert to use infrastructure triggered keepalives

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The watchdog infrastructure now supports handling watchdog keepalive
if the watchdog is running while the watchdog device is closed.
Convert the driver to use this infrastructure.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Guenter Roeck 2016-02-28 13:12:20 -08:00 committed by Wim Van Sebroeck
parent f29a72c24a
commit 11d7aba9ce
1 changed files with 13 additions and 61 deletions
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74
drivers/watchdog/imx2_wdt.c
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@ -25,14 +25,12 @@
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/timer.h>
#include <linux/watchdog.h>
#define DRIVER_NAME "imx2-wdt"
@ -60,7 +58,6 @@
struct imx2_wdt_device {
struct clk *clk;
struct regmap *regmap;
struct timer_list timer; /* Pings the watchdog when closed */
struct watchdog_device wdog;
};
@ -147,16 +144,6 @@ static int imx2_wdt_ping(struct watchdog_device *wdog)
return 0;
}
static void imx2_wdt_timer_ping(unsigned long arg)
{
struct watchdog_device *wdog = (struct watchdog_device *)arg;
struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
/* ping it every wdog->timeout / 2 seconds to prevent reboot */
imx2_wdt_ping(wdog);
mod_timer(&wdev->timer, jiffies + wdog->timeout * HZ / 2);
}
static int imx2_wdt_set_timeout(struct watchdog_device *wdog,
unsigned int new_timeout)
{
@ -173,40 +160,19 @@ static int imx2_wdt_start(struct watchdog_device *wdog)
{
struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
if (imx2_wdt_is_running(wdev)) {
/* delete the timer that pings the watchdog after close */
del_timer_sync(&wdev->timer);
if (imx2_wdt_is_running(wdev))
imx2_wdt_set_timeout(wdog, wdog->timeout);
} else
else
imx2_wdt_setup(wdog);
set_bit(WDOG_HW_RUNNING, &wdog->status);
return imx2_wdt_ping(wdog);
}
static int imx2_wdt_stop(struct watchdog_device *wdog)
{
/*
* We don't need a clk_disable, it cannot be disabled once started.
* We use a timer to ping the watchdog while /dev/watchdog is closed
*/
imx2_wdt_timer_ping((unsigned long)wdog);
return 0;
}
static inline void imx2_wdt_ping_if_active(struct watchdog_device *wdog)
{
struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
if (imx2_wdt_is_running(wdev)) {
imx2_wdt_set_timeout(wdog, wdog->timeout);
imx2_wdt_timer_ping((unsigned long)wdog);
}
}
static const struct watchdog_ops imx2_wdt_ops = {
.owner = THIS_MODULE,
.start = imx2_wdt_start,
.stop = imx2_wdt_stop,
.ping = imx2_wdt_ping,
.set_timeout = imx2_wdt_set_timeout,
.restart = imx2_wdt_restart,
@ -254,7 +220,7 @@ static int __init imx2_wdt_probe(struct platform_device *pdev)
wdog->info = &imx2_wdt_info;
wdog->ops = &imx2_wdt_ops;
wdog->min_timeout = 1;
wdog->max_timeout = IMX2_WDT_MAX_TIME;
wdog->max_hw_heartbeat_ms = IMX2_WDT_MAX_TIME * 1000;
wdog->parent = &pdev->dev;
ret = clk_prepare_enable(wdev->clk);
@ -275,9 +241,10 @@ static int __init imx2_wdt_probe(struct platform_device *pdev)
watchdog_set_restart_priority(wdog, 128);
watchdog_init_timeout(wdog, timeout, &pdev->dev);
setup_timer(&wdev->timer, imx2_wdt_timer_ping, (unsigned long)wdog);
imx2_wdt_ping_if_active(wdog);
if (imx2_wdt_is_running(wdev)) {
imx2_wdt_set_timeout(wdog, wdog->timeout);
set_bit(WDOG_HW_RUNNING, &wdog->status);
}
/*
* Disable the watchdog power down counter at boot. Otherwise the power
@ -310,7 +277,6 @@ static int __exit imx2_wdt_remove(struct platform_device *pdev)
watchdog_unregister_device(wdog);
if (imx2_wdt_is_running(wdev)) {
del_timer_sync(&wdev->timer);
imx2_wdt_ping(wdog);
dev_crit(&pdev->dev, "Device removed: Expect reboot!\n");
}
@ -324,10 +290,9 @@ static void imx2_wdt_shutdown(struct platform_device *pdev)
if (imx2_wdt_is_running(wdev)) {
/*
* We are running, we need to delete the timer but will
* give max timeout before reboot will take place
* We are running, configure max timeout before reboot
* will take place.
*/
del_timer_sync(&wdev->timer);
imx2_wdt_set_timeout(wdog, IMX2_WDT_MAX_TIME);
imx2_wdt_ping(wdog);
dev_crit(&pdev->dev, "Device shutdown: Expect reboot!\n");
@ -345,10 +310,6 @@ static int imx2_wdt_suspend(struct device *dev)
if (imx2_wdt_is_running(wdev)) {
imx2_wdt_set_timeout(wdog, IMX2_WDT_MAX_TIME);
imx2_wdt_ping(wdog);
/* The watchdog is not active */
if (!watchdog_active(wdog))
del_timer_sync(&wdev->timer);
}
clk_disable_unprepare(wdev->clk);
@ -374,19 +335,10 @@ static int imx2_wdt_resume(struct device *dev)
* watchdog again.
*/
imx2_wdt_setup(wdog);
}
if (imx2_wdt_is_running(wdev)) {
imx2_wdt_set_timeout(wdog, wdog->timeout);
imx2_wdt_ping(wdog);
} else if (imx2_wdt_is_running(wdev)) {
/* Resuming from non-deep sleep state. */
imx2_wdt_set_timeout(wdog, wdog->timeout);
imx2_wdt_ping(wdog);
/*
* But the watchdog is not active, then start
* the timer again.
*/
if (!watchdog_active(wdog))
mod_timer(&wdev->timer,
jiffies + wdog->timeout * HZ / 2);
}
return 0;