drivers/watchdog/ep93xx_wdt.c

1 // SPDX-License-Identifier: GPL-2.0-only
15  * This watchdog fires after 250msec, which is a too short interval
17  * wdt each ~200msec and eventually stop doing it if the user space
49 	writel(0xaaaa, priv->mmio + EP93XX_WATCHDOG);  in ep93xx_wdt_start()
58 	writel(0xaa55, priv->mmio + EP93XX_WATCHDOG);  in ep93xx_wdt_stop()
67 	writel(0x5555, priv->mmio + EP93XX_WATCHDOG);  in ep93xx_wdt_ping()
89 	struct device *dev = &pdev->dev;  in ep93xx_wdt_probe()
97 		return -ENOMEM;  in ep93xx_wdt_probe()
99 	priv->mmio = devm_platform_ioremap_resource(pdev, 0);  in ep93xx_wdt_probe()
100 	if (IS_ERR(priv->mmio))  in ep93xx_wdt_probe()
101 		return PTR_ERR(priv->mmio);  in ep93xx_wdt_probe()
103 	val = readl(priv->mmio + EP93XX_WATCHDOG);  in ep93xx_wdt_probe()
105 	wdd = &priv->wdd;  in ep93xx_wdt_probe()
106 	wdd->bootstatus = (val & 0x01) ? WDIOF_CARDRESET : 0;  in ep93xx_wdt_probe()
107 	wdd->info = &ep93xx_wdt_ident;  in ep93xx_wdt_probe()
108 	wdd->ops = &ep93xx_wdt_ops;  in ep93xx_wdt_probe()
109 	wdd->min_timeout = 1;  in ep93xx_wdt_probe()
110 	wdd->max_hw_heartbeat_ms = 200;  in ep93xx_wdt_probe()
111 	wdd->parent = dev;  in ep93xx_wdt_probe()
115 	wdd->timeout = WDT_TIMEOUT;  in ep93xx_wdt_probe()
132 		.name	= "ep93xx-wdt",