1 // SPDX-License-Identifier: GPL-2.0-only
3  * Watchdog driver for Faraday Technology FTWDT010
7  * Inspired by the out-of-tree drivers from OpenWRT:
20 #include <linux/watchdog.h>
54 	u32 enable;  in ftwdt010_enable()  local
56 	writel(timeout * WDT_CLOCK, gwdt->base + FTWDT010_WDLOAD);  in ftwdt010_enable()
57 	writel(WDRESTART_MAGIC, gwdt->base + FTWDT010_WDRESTART);  in ftwdt010_enable()
59 	enable = WDCR_CLOCK_5MHZ | WDCR_SYS_RST;  in ftwdt010_enable()
60 	writel(enable, gwdt->base + FTWDT010_WDCR);  in ftwdt010_enable()
62 		enable |= WDCR_WDINTR;  in ftwdt010_enable()
63 	enable |= WDCR_ENABLE;  in ftwdt010_enable()
64 	writel(enable, gwdt->base + FTWDT010_WDCR);  in ftwdt010_enable()
71 	ftwdt010_enable(gwdt, wdd->timeout, gwdt->has_irq);  in ftwdt010_wdt_start()
79 	writel(0, gwdt->base + FTWDT010_WDCR);  in ftwdt010_wdt_stop()
88 	writel(WDRESTART_MAGIC, gwdt->base + FTWDT010_WDRESTART);  in ftwdt010_wdt_ping()
96 	wdd->timeout = timeout;  in ftwdt010_wdt_set_timeout()
114 	watchdog_notify_pretimeout(&gwdt->wdd);  in ftwdt010_wdt_interrupt()
138 	struct device *dev = &pdev->dev;  in ftwdt010_wdt_probe()
146 		return -ENOMEM;  in ftwdt010_wdt_probe()
148 	gwdt->base = devm_platform_ioremap_resource(pdev, 0);  in ftwdt010_wdt_probe()
149 	if (IS_ERR(gwdt->base))  in ftwdt010_wdt_probe()
150 		return PTR_ERR(gwdt->base);  in ftwdt010_wdt_probe()
152 	gwdt->dev = dev;  in ftwdt010_wdt_probe()
153 	gwdt->wdd.info = &ftwdt010_wdt_info;  in ftwdt010_wdt_probe()
154 	gwdt->wdd.ops = &ftwdt010_wdt_ops;  in ftwdt010_wdt_probe()
155 	gwdt->wdd.min_timeout = 1;  in ftwdt010_wdt_probe()
156 	gwdt->wdd.max_timeout = 0xFFFFFFFF / WDT_CLOCK;  in ftwdt010_wdt_probe()
157 	gwdt->wdd.parent = dev;  in ftwdt010_wdt_probe()
160 	 * If 'timeout-sec' unspecified in devicetree, assume a 13 second  in ftwdt010_wdt_probe()
163 	gwdt->wdd.timeout = 13U;  in ftwdt010_wdt_probe()
164 	watchdog_init_timeout(&gwdt->wdd, 0, dev);  in ftwdt010_wdt_probe()
166 	reg = readw(gwdt->base + FTWDT010_WDCR);  in ftwdt010_wdt_probe()
168 		/* Watchdog was enabled by the bootloader, disable it. */  in ftwdt010_wdt_probe()
170 		writel(reg, gwdt->base + FTWDT010_WDCR);  in ftwdt010_wdt_probe()
176 				       "watchdog bark", gwdt);  in ftwdt010_wdt_probe()
179 		gwdt->has_irq = true;  in ftwdt010_wdt_probe()
182 	ret = devm_watchdog_register_device(dev, &gwdt->wdd);  in ftwdt010_wdt_probe()
188 	dev_info(dev, "FTWDT010 watchdog driver enabled\n");  in ftwdt010_wdt_probe()
198 	reg = readw(gwdt->base + FTWDT010_WDCR);  in ftwdt010_wdt_suspend()
200 	writel(reg, gwdt->base + FTWDT010_WDCR);  in ftwdt010_wdt_suspend()
210 	if (watchdog_active(&gwdt->wdd)) {  in ftwdt010_wdt_resume()
211 		reg = readw(gwdt->base + FTWDT010_WDCR);  in ftwdt010_wdt_resume()
213 		writel(reg, gwdt->base + FTWDT010_WDCR);  in ftwdt010_wdt_resume()
226 	{ .compatible = "cortina,gemini-watchdog" },
234 		.name	= "ftwdt010-wdt",
241 MODULE_DESCRIPTION("Watchdog driver for Faraday Technology FTWDT010");