// SPDX-License-Identifier: GPL-2.0+ /* * Watchdog driver for Broadcom BCM2835 * * "bcm2708_wdog" driver written by Luke Diamand that was obtained from * branch "rpi-3.6.y" of git://github.com/raspberrypi/linux.git was used * as a hardware reference for the Broadcom BCM2835 watchdog timer. * * Copyright (C) 2013 Lubomir Rintel <[email protected]> * */ #include <linux/delay.h> #include <linux/types.h> #include <linux/mfd/bcm2835-pm.h> #include <linux/module.h> #include <linux/io.h> #include <linux/watchdog.h> #include <linux/platform_device.h> #include <linux/of_address.h> #include <linux/of_platform.h> #define PM_RSTC … #define PM_RSTS … #define PM_WDOG … #define PM_PASSWORD … #define PM_WDOG_TIME_SET … #define PM_RSTC_WRCFG_CLR … #define PM_RSTS_HADWRH_SET … #define PM_RSTC_WRCFG_SET … #define PM_RSTC_WRCFG_FULL_RESET … #define PM_RSTC_RESET … /* * The Raspberry Pi firmware uses the RSTS register to know which partition * to boot from. The partition value is spread into bits 0, 2, 4, 6, 8, 10. * Partition 63 is a special partition used by the firmware to indicate halt. */ #define PM_RSTS_RASPBERRYPI_HALT … #define SECS_TO_WDOG_TICKS(x) … #define WDOG_TICKS_TO_SECS(x) … #define WDOG_TICKS_TO_MSECS(x) … struct bcm2835_wdt { … }; static struct bcm2835_wdt *bcm2835_power_off_wdt; static unsigned int heartbeat; static bool nowayout = … WATCHDOG_NOWAYOUT; static bool bcm2835_wdt_is_running(struct bcm2835_wdt *wdt) { … } static int bcm2835_wdt_start(struct watchdog_device *wdog) { … } static int bcm2835_wdt_stop(struct watchdog_device *wdog) { … } static unsigned int bcm2835_wdt_get_timeleft(struct watchdog_device *wdog) { … } static void __bcm2835_restart(struct bcm2835_wdt *wdt) { … } static int bcm2835_restart(struct watchdog_device *wdog, unsigned long action, void *data) { … } static const struct watchdog_ops bcm2835_wdt_ops = …; static const struct watchdog_info bcm2835_wdt_info = …; static struct watchdog_device bcm2835_wdt_wdd = …; /* * We can't really power off, but if we do the normal reset scheme, and * indicate to bootcode.bin not to reboot, then most of the chip will be * powered off. */ static void bcm2835_power_off(void) { … } static int bcm2835_wdt_probe(struct platform_device *pdev) { … } static void bcm2835_wdt_remove(struct platform_device *pdev) { … } static struct platform_driver bcm2835_wdt_driver = …; module_platform_driver(…) …; module_param(heartbeat, uint, 0); MODULE_PARM_DESC(…) …; module_param(nowayout, bool, 0); MODULE_PARM_DESC(…) …; MODULE_ALIAS(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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