watchdog: orion: Introduce per-SoC stop() function

In order to support other SoCs, it's needed to have a different stop()
implementation for each SoC. This commit adds no functionality, and it
consists of preparation work.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jason Cooper <jason@lakedaemon.net>
Tested-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Tested-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

drivers/watchdog/orion_wdt.c

@@ -58,6 +58,7 @@ struct orion_watchdog_data {
 	int (*clock_init)(struct platform_device *,
 			  struct orion_watchdog *);
 	int (*start)(struct watchdog_device *);
+	int (*stop)(struct watchdog_device *);
 };
 
 struct orion_watchdog {
@@ -192,7 +193,7 @@ static int orion_wdt_start(struct watchdog_device *wdt_dev)
 	return dev->data->start(wdt_dev);
 }
 
-static int orion_wdt_stop(struct watchdog_device *wdt_dev)
+static int orion_stop(struct watchdog_device *wdt_dev)
 {
 	struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
 
@@ -205,6 +206,29 @@ static int orion_wdt_stop(struct watchdog_device *wdt_dev)
 	return 0;
 }
 
+static int armada370_stop(struct watchdog_device *wdt_dev)
+{
+	struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
+	u32 reg;
+
+	/* Disable reset on watchdog */
+	reg = readl(dev->rstout);
+	reg &= ~dev->data->rstout_enable_bit;
+	writel(reg, dev->rstout);
+
+	/* Disable watchdog timer */
+	atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit, 0);
+
+	return 0;
+}
+
+static int orion_wdt_stop(struct watchdog_device *wdt_dev)
+{
+	struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
+
+	return dev->data->stop(wdt_dev);
+}
+
 static int orion_wdt_enabled(struct orion_watchdog *dev)
 {
 	bool enabled, running;
@@ -277,6 +301,7 @@ static const struct orion_watchdog_data orion_data = {
 	.wdt_counter_offset = 0x24,
 	.clock_init = orion_wdt_clock_init,
 	.start = orion_start,
+	.stop = orion_stop,
 };
 
 static const struct orion_watchdog_data armada370_data = {
@@ -285,6 +310,7 @@ static const struct orion_watchdog_data armada370_data = {
 	.wdt_counter_offset = 0x34,
 	.clock_init = armada370_wdt_clock_init,
 	.start = armada370_start,
+	.stop = armada370_stop,
 };
 
 static const struct orion_watchdog_data armadaxp_data = {
@@ -293,6 +319,7 @@ static const struct orion_watchdog_data armadaxp_data = {
 	.wdt_counter_offset = 0x34,
 	.clock_init = armadaxp_wdt_clock_init,
 	.start = armada370_start,
+	.stop = armada370_stop,
 };
 
 static const struct of_device_id orion_wdt_of_match_table[] = {