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watchdog: pnx4008: add restart handler 

Add restart handler capability to the driver;
the restart handler implementation was taken from
"mach-lpc32xx" ("lpc23xx_restart" function).

Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Sylvain Lemieux 2016-03-04 13:44:06 -05:00 committed by Wim Van Sebroeck
parent 43eec2f50c
commit 4ed5443d91
1 changed files with 17 additions and 0 deletions
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17
drivers/watchdog/pnx4008_wdt.c
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@ -31,6 +31,8 @@
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/err.h> #include <linux/err.h>
#include <linux/of.h> #include <linux/of.h>
#include <linux/delay.h>
#include <linux/reboot.h>
#include <mach/hardware.h> #include <mach/hardware.h>
/* WatchDog Timer - Chapter 23 Page 207 */ /* WatchDog Timer - Chapter 23 Page 207 */
@ -124,6 +126,19 @@ static int pnx4008_wdt_set_timeout(struct watchdog_device *wdd,
return 0; return 0;
} }
static int pnx4008_restart_handler(struct watchdog_device *wdd,
unsigned long mode, void *cmd)
{
/* Instant assert of RESETOUT_N with pulse length 1mS */
writel(13000, WDTIM_PULSE(wdt_base));
writel(M_RES2 | RESFRC1 | RESFRC2, WDTIM_MCTRL(wdt_base));
/* Wait for watchdog to reset system */
mdelay(1000);
return NOTIFY_DONE;
}
static const struct watchdog_info pnx4008_wdt_ident = { static const struct watchdog_info pnx4008_wdt_ident = {
.options = WDIOF_CARDRESET | WDIOF_MAGICCLOSE | .options = WDIOF_CARDRESET | WDIOF_MAGICCLOSE |
WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
@ -135,6 +150,7 @@ static const struct watchdog_ops pnx4008_wdt_ops = {
.start = pnx4008_wdt_start, .start = pnx4008_wdt_start,
.stop = pnx4008_wdt_stop, .stop = pnx4008_wdt_stop,
.set_timeout = pnx4008_wdt_set_timeout, .set_timeout = pnx4008_wdt_set_timeout,
.restart = pnx4008_restart_handler,
}; };
static struct watchdog_device pnx4008_wdd = { static struct watchdog_device pnx4008_wdd = {
@ -169,6 +185,7 @@ static int pnx4008_wdt_probe(struct platform_device *pdev)
WDIOF_CARDRESET : 0; WDIOF_CARDRESET : 0;
pnx4008_wdd.parent = &pdev->dev; pnx4008_wdd.parent = &pdev->dev;
watchdog_set_nowayout(&pnx4008_wdd, nowayout); watchdog_set_nowayout(&pnx4008_wdd, nowayout);
watchdog_set_restart_priority(&pnx4008_wdd, 128);
pnx4008_wdt_stop(&pnx4008_wdd); /* disable for now */ pnx4008_wdt_stop(&pnx4008_wdd); /* disable for now */