drivers/watchdog/via_wdt.c

1 // SPDX-License-Identifier: GPL-2.0-only
26 #define VIA_WDT_CONF		0xec	/* watchdog enable state */
29 #define VIA_WDT_CONF_ENABLE	0x01	/* 1: enable watchdog */
30 #define VIA_WDT_CONF_MMIO	0x02	/* 1: enable watchdog MMIO */
53 /* User space timeout in seconds */
56 static int timeout = WDT_TIMEOUT;  variable
57 module_param(timeout, int, 0);
58 MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds, between 1 and 1023 "
103 	/* calculate when the next userspace timeout will be */  in wdt_ping()
104 	next_heartbeat = jiffies + wdd->timeout * HZ;  in wdt_ping()
112 	writel(wdd->timeout, wdt_mem + VIA_WDT_COUNT);  in wdt_start()
131 	wdd->timeout = new_timeout;  in wdt_set_timeout()
162 	int ret = -ENODEV;  in wdt_probe()
165 		dev_err(&pdev->dev, "cannot enable PCI device\n");  in wdt_probe()
166 		return -ENODEV;  in wdt_probe()
177 		dev_err(&pdev->dev, "MMIO allocation failed\n");  in wdt_probe()
188 		dev_info(&pdev->dev, "VIA Chipset watchdog MMIO: %x\n", mmio);  in wdt_probe()
190 		dev_err(&pdev->dev, "MMIO setting failed. Check BIOS.\n");  in wdt_probe()
195 		dev_err(&pdev->dev, "MMIO region busy\n");  in wdt_probe()
201 		dev_err(&pdev->dev, "cannot remap VIA wdt MMIO registers\n");  in wdt_probe()
205 	if (timeout < 1 || timeout > WDT_TIMEOUT_MAX)  in wdt_probe()
206 		timeout = WDT_TIMEOUT;  in wdt_probe()
208 	wdt_dev.timeout = timeout;  in wdt_probe()
209 	wdt_dev.parent = &pdev->dev;  in wdt_probe()