1 // SPDX-License-Identifier: GPL-2.0+
3  *	exar_wdt.c - Driver for the watchdog present in some
21 static const unsigned short sio_config_ports[] = { 0x2e, 0x4e };
60 	unsigned short did;
61 	unsigned short config_port;
81 static int exar_sio_enter(const unsigned short config_port,  in exar_sio_enter()
85 		return -EBUSY;  in exar_sio_enter()
87 	/* write the ENTER-KEY twice */  in exar_sio_enter()
94 static void exar_sio_exit(const unsigned short config_port)  in exar_sio_exit()
100 static unsigned char exar_sio_read(const unsigned short config_port,  in exar_sio_read()
107 static void exar_sio_write(const unsigned short config_port,  in exar_sio_write()
114 static unsigned short exar_sio_read16(const unsigned short config_port,  in exar_sio_read16()
125 static void exar_sio_select_wdt(const unsigned short config_port)  in exar_sio_select_wdt()
132 	unsigned short rt_base = priv->wdt_res.start;  in exar_wdt_arm()
135 	outb(priv->timeout, rt_base + WDT_VAL);  in exar_wdt_arm()
136 	outb(priv->timeout, rt_base + WDT_VAL);  in exar_wdt_arm()
141 	unsigned short rt_base = priv->wdt_res.start;  in exar_wdt_disarm()
156 	unsigned short rt_base = priv->wdt_res.start;  in exar_wdt_start()
158 	spin_lock(&priv->io_lock);  in exar_wdt_start()
161 	outb(priv->unit, rt_base + WDT_CTRL);  in exar_wdt_start()
164 	spin_unlock(&priv->io_lock);  in exar_wdt_start()
172 	spin_lock(&priv->io_lock);  in exar_wdt_stop()
176 	spin_unlock(&priv->io_lock);  in exar_wdt_stop()
183 	unsigned short rt_base = priv->wdt_res.start;  in exar_wdt_keepalive()
185 	spin_lock(&priv->io_lock);  in exar_wdt_keepalive()
190 	spin_unlock(&priv->io_lock);  in exar_wdt_keepalive()
209 	priv->unit = unit_min ? WDT_UNITS_MIN : WDT_UNITS_SEC;  in exar_wdt_set_timeout()
210 	priv->timeout = t;  in exar_wdt_set_timeout()
212 	wdog->timeout = unit_min ? t * 60 : t;  in exar_wdt_set_timeout()
231 	.ping		= exar_wdt_keepalive,
241 	ret = exar_sio_enter(priv->config_port, priv->enter_key);  in exar_wdt_config()
245 	exar_sio_select_wdt(priv->config_port);  in exar_wdt_config()
246 	exar_sio_write(priv->config_port, EXAR_WDT, conf);  in exar_wdt_config()
248 	exar_sio_exit(priv->config_port);  in exar_wdt_config()
255 	struct device *dev = &pdev->dev;  in exar_wdt_probe()
256 	struct wdt_priv *priv = dev->platform_data;  in exar_wdt_probe()
257 	struct watchdog_device *wdt_dev = &priv->wdt_dev;  in exar_wdt_probe()
263 		return -ENXIO;  in exar_wdt_probe()
265 	spin_lock_init(&priv->io_lock);  in exar_wdt_probe()
267 	wdt_dev->info = &exar_wdt_info;  in exar_wdt_probe()
268 	wdt_dev->ops = &exar_wdt_ops;  in exar_wdt_probe()
269 	wdt_dev->min_timeout = 1;  in exar_wdt_probe()
270 	wdt_dev->max_timeout = 255 * 60;  in exar_wdt_probe()
291 		 priv->did, timeout, nowayout);  in exar_wdt_probe()
296 static unsigned short __init exar_detect(const unsigned short config_port,  in exar_detect()
298 					 unsigned short *rt_base)  in exar_detect()
301 	unsigned short base = 0;  in exar_detect()
302 	unsigned short vid, did;  in exar_detect()
347 		return -ENOMEM;  in exar_wdt_register()
349 	INIT_LIST_HEAD(&n->list);  in exar_wdt_register()
351 	scnprintf((char *)n->name, sizeof(n->name), DRV_NAME ".%d", idx);  in exar_wdt_register()
352 	priv->wdt_res.name = n->name;  in exar_wdt_register()
354 	n->pdev = platform_device_register_resndata(NULL, DRV_NAME, idx,  in exar_wdt_register()
355 						    &priv->wdt_res, 1,  in exar_wdt_register()
357 	if (IS_ERR(n->pdev)) {  in exar_wdt_register()
358 		int err = PTR_ERR(n->pdev);  in exar_wdt_register()
364 	list_add_tail(&n->list, &pdev_list);  in exar_wdt_register()
374 		platform_device_unregister(n->pdev);  in exar_wdt_unregister()
375 		list_del(&n->list);  in exar_wdt_unregister()
387 			unsigned short did, rt_base = 0;  in exar_wdt_init()
409 		return -ENODEV;  in exar_wdt_init()