drivers/watchdog/ie6xx_wdt.c

1 // SPDX-License-Identifier: GPL-2.0-only
3  *      Intel Atom E6xx Watchdog driver
6  *                <alexander.stein@systec-electronic.com>
15 #include <linux/watchdog.h>
48 static unsigned int timeout = DEFAULT_TIME;  variable
49 module_param(timeout, uint, 0);
50 MODULE_PARM_DESC(timeout,
51 		"Default Watchdog timer setting ("
58 	"Watchdog cannot be stopped once started (default="
101 	/* Watchdog clock is PCI Clock (33MHz) */  in ie6xx_wdt_set_timeout()
109 	preload -= 1;  in ie6xx_wdt_set_timeout()
113 	/* Set ResetMode & Enable prescaler for range 10ms to 10 min */  in ie6xx_wdt_set_timeout()
128 	wdd->timeout = t;  in ie6xx_wdt_set_timeout()
134 	ie6xx_wdt_set_timeout(wdd, wdd->timeout);  in ie6xx_wdt_start()
136 	/* Enable the watchdog timer */  in ie6xx_wdt_start()
147 		return -1;  in ie6xx_wdt_stop()
149 	/* Disable the watchdog timer */  in ie6xx_wdt_stop()
158 	.identity =	"Intel Atom E6xx Watchdog",
232 		return -ENODEV;  in ie6xx_wdt_probe()
234 	if (!request_region(res->start, resource_size(res), pdev->name)) {  in ie6xx_wdt_probe()
235 		dev_err(&pdev->dev, "Watchdog region 0x%llx already in use!\n",  in ie6xx_wdt_probe()
236 			(u64)res->start);  in ie6xx_wdt_probe()
237 		return -EBUSY;  in ie6xx_wdt_probe()
240 	ie6xx_wdt_data.sch_wdtba = res->start;  in ie6xx_wdt_probe()
241 	dev_dbg(&pdev->dev, "WDT = 0x%X\n", ie6xx_wdt_data.sch_wdtba);  in ie6xx_wdt_probe()
243 	ie6xx_wdt_dev.timeout = timeout;  in ie6xx_wdt_probe()
245 	ie6xx_wdt_dev.parent = &pdev->dev;  in ie6xx_wdt_probe()
251 		dev_warn(&pdev->dev,  in ie6xx_wdt_probe()
252 			"Watchdog Timer is Locked (Reg=0x%x)\n", wdtlr);  in ie6xx_wdt_probe()
264 	release_region(res->start, resource_size(res));  in ie6xx_wdt_probe()
277 	release_region(res->start, resource_size(res));  in ie6xx_wdt_remove()
295 	if ((timeout < MIN_TIME) ||  in ie6xx_wdt_init()
296 	    (timeout > MAX_TIME)) {  in ie6xx_wdt_init()
297 		pr_err("Watchdog timer: value of timeout %d (dec) "  in ie6xx_wdt_init()
299 		  timeout, MIN_TIME, MAX_TIME);  in ie6xx_wdt_init()
300 		return -EINVAL;  in ie6xx_wdt_init()
314 MODULE_AUTHOR("Alexander Stein <alexander.stein@systec-electronic.com>");
315 MODULE_DESCRIPTION("Intel Atom E6xx Watchdog Device Driver");