linux-kernel - [PATCH] watchdog: sp805: add restart handler

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Date:   Mon, 30 Apr 2018 15:44:33 +0900
From:   Jongsung Kim <neidhard.kim@....com>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        Wim Van Sebroeck <wim@...ana.be>,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Chanho Min <chanho.min@....com>,
        Jongsung Kim <neidhard.kim@....com>
Subject: [PATCH] watchdog: sp805: add restart handler

Add restart handler for SP805 watchdog so that the driver can be
used to reboot the system.

Signed-off-by: Jongsung Kim <neidhard.kim@....com>
---
 drivers/watchdog/sp805_wdt.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/watchdog/sp805_wdt.c b/drivers/watchdog/sp805_wdt.c
index 01d816251302..01f7b6c29f92 100644
--- a/drivers/watchdog/sp805_wdt.c
+++ b/drivers/watchdog/sp805_wdt.c
@@ -23,6 +23,7 @@
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/pm.h>
+#include <linux/reboot.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/types.h>
@@ -67,6 +68,7 @@ struct sp805_wdt {
 	struct clk			*clk;
 	struct amba_device		*adev;
 	unsigned int			load_val;
+	struct notifier_block		restart;
 };
 
 static bool nowayout = WATCHDOG_NOWAYOUT;
@@ -200,6 +202,18 @@ static const struct watchdog_ops wdt_ops = {
 	.get_timeleft	= wdt_timeleft,
 };
 
+static int
+wdt_restart(struct notifier_block *this, unsigned long mode, void *cmd)
+{
+	struct sp805_wdt *wdt = container_of(this, struct sp805_wdt, restart);
+
+	writel_relaxed(0, wdt->base + WDTCONTROL);
+	writel_relaxed(0, wdt->base + WDTLOAD);
+	writel_relaxed(INT_ENABLE | RESET_ENABLE, wdt->base + WDTCONTROL);
+
+	return 0;
+}
+
 static int
 sp805_wdt_probe(struct amba_device *adev, const struct amba_id *id)
 {
@@ -241,6 +255,10 @@ sp805_wdt_probe(struct amba_device *adev, const struct amba_id *id)
 	}
 	amba_set_drvdata(adev, wdt);
 
+	wdt->restart.notifier_call = wdt_restart;
+	wdt->restart.priority = 128;
+	register_restart_handler(&wdt->restart);
+
 	dev_info(&adev->dev, "registration successful\n");
 	return 0;
 
@@ -253,6 +271,7 @@ static int sp805_wdt_remove(struct amba_device *adev)
 {
 	struct sp805_wdt *wdt = amba_get_drvdata(adev);
 
+	unregister_restart_handler(&wdt->restart);
 	watchdog_unregister_device(&wdt->wdd);
 	watchdog_set_drvdata(&wdt->wdd, NULL);
 
-- 
2.14.1