// SPDX-License-Identifier: GPL-2.0+ /* * Watchdog driver for Atmel AT91SAM9x processors. * * Copyright (C) 2008 Renaud CERRATO [email protected] * */ /* * The Watchdog Timer Mode Register can be only written to once. If the * timeout need to be set from Linux, be sure that the bootstrap or the * bootloader doesn't write to this register. */ #define pr_fmt(fmt) … #include <linux/clk.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/platform_device.h> #include <linux/reboot.h> #include <linux/types.h> #include <linux/watchdog.h> #include <linux/jiffies.h> #include <linux/timer.h> #include <linux/bitops.h> #include <linux/uaccess.h> #include <linux/of.h> #include <linux/of_irq.h> #include "at91sam9_wdt.h" #define DRV_NAME … #define wdt_read(wdt, field) … #define wdt_write(wtd, field, val) … /* AT91SAM9 watchdog runs a 12bit counter @ 256Hz, * use this to convert a watchdog * value from/to milliseconds. */ #define ticks_to_hz_rounddown(t) … #define ticks_to_hz_roundup(t) … #define ticks_to_secs(t) … #define secs_to_ticks(s) … #define WDT_MR_RESET … /* Watchdog max counter value in ticks */ #define WDT_COUNTER_MAX_TICKS … /* Watchdog max delta/value in secs */ #define WDT_COUNTER_MAX_SECS … /* Hardware timeout in seconds */ #define WDT_HW_TIMEOUT … /* Timer heartbeat (500ms) */ #define WDT_TIMEOUT … /* User land timeout */ #define WDT_HEARTBEAT … static int heartbeat; module_param(heartbeat, int, 0); MODULE_PARM_DESC(…) …; static bool nowayout = … WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(…) …; #define to_wdt(wdd) … struct at91wdt { … }; /* ......................................................................... */ static irqreturn_t wdt_interrupt(int irq, void *dev_id) { … } /* * Reload the watchdog timer. (ie, pat the watchdog) */ static inline void at91_wdt_reset(struct at91wdt *wdt) { … } /* * Timer tick */ static void at91_ping(struct timer_list *t) { … } static int at91_wdt_start(struct watchdog_device *wdd) { … } static int at91_wdt_stop(struct watchdog_device *wdd) { … } static int at91_wdt_set_timeout(struct watchdog_device *wdd, unsigned int new_timeout) { … } static int at91_wdt_init(struct platform_device *pdev, struct at91wdt *wdt) { … } /* ......................................................................... */ static const struct watchdog_info at91_wdt_info = …; static const struct watchdog_ops at91_wdt_ops = …; #if defined(CONFIG_OF) static int of_at91wdt_init(struct device_node *np, struct at91wdt *wdt) { … } #else static inline int of_at91wdt_init(struct device_node *np, struct at91wdt *wdt) { return 0; } #endif static int at91wdt_probe(struct platform_device *pdev) { … } static void at91wdt_remove(struct platform_device *pdev) { … } #if defined(CONFIG_OF) static const struct of_device_id at91_wdt_dt_ids[] = …; MODULE_DEVICE_TABLE(of, at91_wdt_dt_ids); #endif static struct platform_driver at91wdt_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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