@@ -53,6 +53,13 @@ static unsigned timer_margin;
module_param(timer_margin, uint, 0);
MODULE_PARM_DESC(timer_margin, "initial watchdog timeout (in seconds)");
+static int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout,
+ "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+
static unsigned int wdt_trgr_pattern = 0x1234;
static spinlock_t wdt_lock;
@@ -188,22 +195,20 @@ static int omap_wdt_release(struct inode *inode, struct file *file)
{
struct omap_wdt_dev *wdev = file->private_data;
- /*
- * Shut off the timer unless NOWAYOUT is defined.
- */
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
-
omap_wdt_ick_enable(wdev->mpu_wdt_ick, 1);
- omap_wdt_disable(wdev);
- omap_wdt_ick_enable(wdev->mpu_wdt_ick, 0);
+ if (nowayout) {
+ /* Give the user application some time to recover
+ * in case of crash.
+ * */
+ omap_wdt_ping(wdev);
+ printk(KERN_CRIT "omap_wdt: Unexpected close, not stopping!\n");
+ } else {
+ omap_wdt_disable(wdev);
- clk_disable(wdev->mpu_wdt_fck);
- wdev->omap_wdt_state &= ~(1 << OMAP_WDT_STATE_ACTIVATED_BIT);
-#else
- /* Give the user application some time to recover in case of crash. */
- omap_wdt_ping(wdev);
- printk(KERN_CRIT "omap_wdt: Unexpected close, not stopping!\n");
-#endif
+ clk_disable(wdev->mpu_wdt_fck);
+ wdev->omap_wdt_state &= ~(1 << OMAP_WDT_STATE_ACTIVATED_BIT);
+ }
+ omap_wdt_ick_enable(wdev->mpu_wdt_ick, 0);
wdev->omap_wdt_state &= ~(1 << OMAP_WDT_STATE_OPENED_BIT);
return 0;
@@ -385,9 +390,10 @@ static int __init omap_wdt_probe(struct platform_device *pdev)
if (ret)
goto err_misc;
- pr_info("OMAP Watchdog Timer Rev 0x%02x: initial timeout %d sec\n",
+ pr_info("OMAP Watchdog Timer Rev 0x%02x: initial "
+ "timeout %d sec, nowayout is %s\n",
__raw_readl(wdev->base + OMAP_WATCHDOG_REV) & 0xFF,
- timer_margin);
+ timer_margin, (nowayout ? "on" : "off"));
/* autogate OCP interface clock */
__raw_writel(0x01, wdev->base + OMAP_WATCHDOG_SYS_CONFIG);
@@ -467,12 +473,6 @@ static int omap_wdt_remove(struct platform_device *pdev)
#ifdef CONFIG_PM
-/* REVISIT ... not clear this is the best way to handle system suspend; and
- * it's very inappropriate for selective device suspend (e.g. suspending this
- * through sysfs rather than by stopping the watchdog daemon). Also, this
- * may not play well enough with NOWAYOUT...
- */
-
static int omap_wdt_suspend(struct platform_device *pdev, pm_message_t state)
{
struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
@@ -481,6 +481,8 @@ static int omap_wdt_suspend(struct platform_device *pdev, pm_message_t state)
omap_wdt_ick_enable(wdev->mpu_wdt_ick, 1);
omap_wdt_disable(wdev);
omap_wdt_ick_enable(wdev->mpu_wdt_ick, 0);
+ clk_disable(wdev->mpu_wdt_fck);
+printk (KERN_EMERG "omap_wdt: suspend \n");
}
return 0;
@@ -491,10 +493,12 @@ static int omap_wdt_resume(struct platform_device *pdev)
struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
if (wdev->omap_wdt_state & (1<<OMAP_WDT_STATE_ACTIVATED_BIT)) {
+ clk_enable(wdev->mpu_wdt_fck);
omap_wdt_ick_enable(wdev->mpu_wdt_ick, 1);
omap_wdt_enable(wdev);
omap_wdt_ping(wdev);
omap_wdt_ick_enable(wdev->mpu_wdt_ick, 0);
+printk (KERN_EMERG "omap_wdt: resume\n");
}
return 0;
By introducing additional module parameter we make the CONFIG_WATCHDOG_NOWAYOUT to be a mere default module behavior, which can be overriden by providing nowayout=[01] parameter at load time. Signed-off-by: Atal Shargorodsky <ext-atal.shargorodsky@nokia.com> --- drivers/watchdog/omap_wdt.c | 48 +++++++++++++++++++++++------------------- 1 files changed, 26 insertions(+), 22 deletions(-)