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watchdog: sp805: set WDOG_HW_RUNNING when appropriate

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If the watchdog hardware is already enabled during the boot process,
when the Linux watchdog driver loads, it should reset the watchdog and
tell the watchdog framework. As a result, ping can be generated from
the watchdog framework, until the userspace watchdog daemon takes over
control

Signed-off-by: Ray Jui <ray.jui@broadcom.com>
Reviewed-by: Vladimir Olovyannikov <vladimir.olovyannikov@broadcom.com>
Reviewed-by: Scott Branden <scott.branden@broadcom.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Ray Jui 2018-05-28 11:01:35 -07:00 committed by Wim Van Sebroeck
parent b800885888
commit fa5072ed8f
1 changed files with 19 additions and 0 deletions
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19
drivers/watchdog/sp805_wdt.c
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@ -42,6 +42,7 @@
/* control register masks */
#define INT_ENABLE (1 << 0)
#define RESET_ENABLE (1 << 1)
#define ENABLE_MASK (INT_ENABLE | RESET_ENABLE)
#define WDTINTCLR 0x00C
#define WDTRIS 0x010
#define WDTMIS 0x014
@ -74,6 +75,15 @@ module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout,
"Set to 1 to keep watchdog running after device release");
/* returns true if wdt is running; otherwise returns false */
static bool wdt_is_running(struct watchdog_device *wdd)
{
struct sp805_wdt *wdt = watchdog_get_drvdata(wdd);
u32 wdtcontrol = readl_relaxed(wdt->base + WDTCONTROL);
return (wdtcontrol & ENABLE_MASK) == ENABLE_MASK;
}
/* This routine finds load value that will reset system in required timout */
static int wdt_setload(struct watchdog_device *wdd, unsigned int timeout)
{
@ -253,6 +263,15 @@ sp805_wdt_probe(struct amba_device *adev, const struct amba_id *id)
watchdog_init_timeout(&wdt->wdd, 0, &adev->dev);
wdt_setload(&wdt->wdd, wdt->wdd.timeout);
/*
* If HW is already running, enable/reset the wdt and set the running
* bit to tell the wdt subsystem
*/
if (wdt_is_running(&wdt->wdd)) {
wdt_enable(&wdt->wdd);
set_bit(WDOG_HW_RUNNING, &wdt->wdd.status);
}
ret = watchdog_register_device(&wdt->wdd);
if (ret) {
dev_err(&adev->dev, "watchdog_register_device() failed: %d\n",