1 // SPDX-License-Identifier: GPL-2.0-or-later
33 static unsigned int timeout;  variable
34 module_param(timeout, uint, 0);
35 MODULE_PARM_DESC(timeout,
36 		 "Watchdog timeout in seconds. (default="
63 	return period * counter - period / 2;  in nic7018_timeout()
66 static const struct nic7018_config *nic7018_get_config(u32 timeout,  in nic7018_get_config()  argument
72 	if (timeout < 30 && timeout != 16) {  in nic7018_get_config()
74 		count = timeout / 2 + 1;  in nic7018_get_config()
77 		count = DIV_ROUND_UP(timeout + 16, 32);  in nic7018_get_config()
87 			       unsigned int timeout)  in nic7018_set_timeout()  argument
89 	struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd);  in nic7018_set_timeout()  local
93 	config = nic7018_get_config(timeout, &counter);  in nic7018_set_timeout()
95 	outb(counter << 4 | config->divider,  in nic7018_set_timeout()
96 	     wdt->io_base + WDT_PRESET_PRESCALE);  in nic7018_set_timeout()
98 	wdd->timeout = nic7018_timeout(config->period, counter);  in nic7018_set_timeout()
99 	wdt->period = config->period;  in nic7018_set_timeout()
106 	struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd);  in nic7018_start()  local
109 	nic7018_set_timeout(wdd, wdd->timeout);  in nic7018_start()
111 	control = inb(wdt->io_base + WDT_RELOAD_CTRL);  in nic7018_start()
112 	outb(control | WDT_RELOAD_PORT_EN, wdt->io_base + WDT_RELOAD_CTRL);  in nic7018_start()
114 	outb(1, wdt->io_base + WDT_RELOAD_PORT);  in nic7018_start()
116 	control = inb(wdt->io_base + WDT_CTRL);  in nic7018_start()
117 	outb(control | WDT_CTRL_RESET_EN, wdt->io_base + WDT_CTRL);  in nic7018_start()
124 	struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd);  in nic7018_stop()  local
126 	outb(0, wdt->io_base + WDT_CTRL);  in nic7018_stop()
127 	outb(0, wdt->io_base + WDT_RELOAD_CTRL);  in nic7018_stop()
128 	outb(0xF0, wdt->io_base + WDT_PRESET_PRESCALE);  in nic7018_stop()
135 	struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd);  in nic7018_ping()  local
137 	outb(1, wdt->io_base + WDT_RELOAD_PORT);  in nic7018_ping()
144 	struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd);  in nic7018_get_timeleft()  local
147 	count = inb(wdt->io_base + WDT_COUNT) & 0xF;  in nic7018_get_timeleft()
151 	return nic7018_timeout(wdt->period, count);  in nic7018_get_timeleft()
170 	struct device *dev = &pdev->dev;  in nic7018_probe()
172 	struct nic7018_wdt *wdt;  in nic7018_probe()  local
176 	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);  in nic7018_probe()
177 	if (!wdt)  in nic7018_probe()
178 		return -ENOMEM;  in nic7018_probe()
180 	platform_set_drvdata(pdev, wdt);  in nic7018_probe()
185 		return -EINVAL;  in nic7018_probe()
188 	if (!devm_request_region(dev, io_rc->start, resource_size(io_rc),  in nic7018_probe()
191 		return -EBUSY;  in nic7018_probe()
194 	wdt->io_base = io_rc->start;  in nic7018_probe()
195 	wdd = &wdt->wdd;  in nic7018_probe()
196 	wdd->info = &nic7018_wdd_info;  in nic7018_probe()
197 	wdd->ops = &nic7018_wdd_ops;  in nic7018_probe()
198 	wdd->min_timeout = WDT_MIN_TIMEOUT;  in nic7018_probe()
199 	wdd->max_timeout = WDT_MAX_TIMEOUT;  in nic7018_probe()
200 	wdd->timeout = WDT_DEFAULT_TIMEOUT;  in nic7018_probe()
201 	wdd->parent = dev;  in nic7018_probe()
203 	watchdog_set_drvdata(wdd, wdt);  in nic7018_probe()
205 	watchdog_init_timeout(wdd, timeout, dev);  in nic7018_probe()
207 	/* Unlock WDT register */  in nic7018_probe()
208 	outb(UNLOCK, wdt->io_base + WDT_REG_LOCK);  in nic7018_probe()
212 		outb(LOCK, wdt->io_base + WDT_REG_LOCK);  in nic7018_probe()
216 	dev_dbg(dev, "io_base=0x%04X, timeout=%d, nowayout=%d\n",  in nic7018_probe()
217 		wdt->io_base, timeout, nowayout);  in nic7018_probe()
223 	struct nic7018_wdt *wdt = platform_get_drvdata(pdev);  in nic7018_remove()  local
225 	watchdog_unregister_device(&wdt->wdd);  in nic7018_remove()
227 	/* Lock WDT register */  in nic7018_remove()
228 	outb(LOCK, wdt->io_base + WDT_REG_LOCK);  in nic7018_remove()