drivers/watchdog/pnx4008_wdt.c

1 // SPDX-License-Identifier: GPL-2.0
3  * drivers/char/watchdog/pnx4008_wdt.c
5  * Watchdog driver for PNX4008 board
12  * 2005-2006 (c) MontaVista Software, Inc.
23 #include <linux/watchdog.h>
34 /* WatchDog Timer - Chapter 23 Page 207 */
39 /* Watchdog timer register set definition */
98 	/* the longest pulse period 65541/(13*10^6) seconds ~ 5 ms. */  in pnx4008_wdt_start()
100 	writel(wdd->timeout * WDOG_COUNTER_RATE, WDTIM_MATCH0(wdt_base));  in pnx4008_wdt_start()
121 	wdd->timeout = new_timeout;  in pnx4008_wdt_set_timeout()
133 	 * - For details, see the 'reboot' syscall in kernel/reboot.c  in pnx4008_restart_handler()
134 	 * - If the received "cmd" is not supported, use the default mode.  in pnx4008_restart_handler()
149 		/* Instant assert of RESETOUT_N with pulse length 1mS */  in pnx4008_restart_handler()
154 	/* Wait for watchdog to reset system */  in pnx4008_restart_handler()
163 	.identity = "PNX4008 Watchdog",
177 	.timeout = DEFAULT_HEARTBEAT,
184 	struct device *dev = &pdev->dev;  in pnx4008_wdt_probe()
210 	dev_info(dev, "heartbeat %d sec\n", pnx4008_wdd.timeout);  in pnx4008_wdt_probe()
217 	{ .compatible = "nxp,pnx4008-wdt" },
225 		.name = "pnx4008-watchdog",
235 MODULE_DESCRIPTION("PNX4008 Watchdog Driver");
239 		 "Watchdog heartbeat period in seconds from 1 to "
245 		 "Set to 1 to keep watchdog running after device release");
248 MODULE_ALIAS("platform:pnx4008-watchdog");