1 // SPDX-License-Identifier: GPL-2.0-or-later
44 static unsigned int timeout;  variable
45 module_param(timeout, uint, 0);
46 MODULE_PARM_DESC(timeout,
47 		 "Watchdog timeout in seconds. (default="
56 static void ni903x_start(struct ni903x_wdt *wdt)  in ni903x_start()  argument
58 	u8 control = inb(wdt->io_base + NIWD_CONTROL);  in ni903x_start()
60 	outb(control | NIWD_CONTROL_RESET, wdt->io_base + NIWD_CONTROL);  in ni903x_start()
61 	outb(control | NIWD_CONTROL_PET, wdt->io_base + NIWD_CONTROL);  in ni903x_start()
65 				  unsigned int timeout)  in ni903x_wdd_set_timeout()  argument
67 	struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd);  in ni903x_wdd_set_timeout()  local
68 	u32 counter = timeout * (1000000000 / NIWD_PERIOD_NS);  in ni903x_wdd_set_timeout()
70 	outb(((0x00FF0000 & counter) >> 16), wdt->io_base + NIWD_SEED2);  in ni903x_wdd_set_timeout()
71 	outb(((0x0000FF00 & counter) >> 8), wdt->io_base + NIWD_SEED1);  in ni903x_wdd_set_timeout()
72 	outb((0x000000FF & counter), wdt->io_base + NIWD_SEED0);  in ni903x_wdd_set_timeout()
74 	wdd->timeout = timeout;  in ni903x_wdd_set_timeout()
81 	struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd);  in ni903x_wdd_get_timeleft()  local
85 	control = inb(wdt->io_base + NIWD_CONTROL);  in ni903x_wdd_get_timeleft()
87 	outb(control, wdt->io_base + NIWD_CONTROL);  in ni903x_wdd_get_timeleft()
89 	counter2 = inb(wdt->io_base + NIWD_COUNTER2);  in ni903x_wdd_get_timeleft()
90 	counter1 = inb(wdt->io_base + NIWD_COUNTER1);  in ni903x_wdd_get_timeleft()
91 	counter0 = inb(wdt->io_base + NIWD_COUNTER0);  in ni903x_wdd_get_timeleft()
100 	struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd);  in ni903x_wdd_ping()  local
103 	control = inb(wdt->io_base + NIWD_CONTROL);  in ni903x_wdd_ping()
104 	outb(control | NIWD_CONTROL_PET, wdt->io_base + NIWD_CONTROL);  in ni903x_wdd_ping()
111 	struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd);  in ni903x_wdd_start()  local
114 	     wdt->io_base + NIWD_CONTROL);  in ni903x_wdd_start()
116 	ni903x_wdd_set_timeout(wdd, wdd->timeout);  in ni903x_wdd_start()
117 	ni903x_start(wdt);  in ni903x_wdd_start()
124 	struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd);  in ni903x_wdd_stop()  local
126 	outb(NIWD_CONTROL_RESET, wdt->io_base + NIWD_CONTROL);  in ni903x_wdd_stop()
133 	struct ni903x_wdt *wdt = data;  in ni903x_resources()  local
136 	switch (res->type) {  in ni903x_resources()
138 		if (wdt->io_base != 0) {  in ni903x_resources()
139 			dev_err(wdt->dev, "too many IO resources\n");  in ni903x_resources()
143 		wdt->io_base = res->data.io.minimum;  in ni903x_resources()
144 		io_size = res->data.io.address_length;  in ni903x_resources()
147 			dev_err(wdt->dev, "memory region too small\n");  in ni903x_resources()
151 		if (!devm_request_region(wdt->dev, wdt->io_base, io_size,  in ni903x_resources()
153 			dev_err(wdt->dev, "failed to get memory region\n");  in ni903x_resources()
182 	struct device *dev = &device->dev;  in ni903x_acpi_add()
184 	struct ni903x_wdt *wdt;  in ni903x_acpi_add()  local
188 	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);  in ni903x_acpi_add()
189 	if (!wdt)  in ni903x_acpi_add()
190 		return -ENOMEM;  in ni903x_acpi_add()
192 	device->driver_data = wdt;  in ni903x_acpi_add()
193 	wdt->dev = dev;  in ni903x_acpi_add()
195 	status = acpi_walk_resources(device->handle, METHOD_NAME__CRS,  in ni903x_acpi_add()
196 				     ni903x_resources, wdt);  in ni903x_acpi_add()
197 	if (ACPI_FAILURE(status) || wdt->io_base == 0) {  in ni903x_acpi_add()
199 		return -ENODEV;  in ni903x_acpi_add()
202 	wdd = &wdt->wdd;  in ni903x_acpi_add()
203 	wdd->info = &ni903x_wdd_info;  in ni903x_acpi_add()
204 	wdd->ops = &ni903x_wdd_ops;  in ni903x_acpi_add()
205 	wdd->min_timeout = NIWD_MIN_TIMEOUT;  in ni903x_acpi_add()
206 	wdd->max_timeout = NIWD_MAX_TIMEOUT;  in ni903x_acpi_add()
207 	wdd->timeout = NIWD_DEFAULT_TIMEOUT;  in ni903x_acpi_add()
208 	wdd->parent = dev;  in ni903x_acpi_add()
209 	watchdog_set_drvdata(wdd, wdt);  in ni903x_acpi_add()
211 	watchdog_init_timeout(wdd, timeout, dev);  in ni903x_acpi_add()
219 	     wdt->io_base + NIWD_CONTROL);  in ni903x_acpi_add()
221 	dev_dbg(dev, "io_base=0x%04X, timeout=%d, nowayout=%d\n",  in ni903x_acpi_add()
222 		wdt->io_base, timeout, nowayout);  in ni903x_acpi_add()
229 	struct ni903x_wdt *wdt = acpi_driver_data(device);  in ni903x_acpi_remove()  local
231 	ni903x_wdd_stop(&wdt->wdd);  in ni903x_acpi_remove()
232 	watchdog_unregister_device(&wdt->wdd);  in ni903x_acpi_remove()