// SPDX-License-Identifier: GPL-2.0-or-later /* * MachZ ZF-Logic Watchdog Timer driver for Linux * * The author does NOT admit liability nor provide warranty for * any of this software. This material is provided "AS-IS" in * the hope that it may be useful for others. * * Author: Fernando Fuganti <[email protected]> * * Based on sbc60xxwdt.c by Jakob Oestergaard * * We have two timers (wd#1, wd#2) driven by a 32 KHz clock with the * following periods: * wd#1 - 2 seconds; * wd#2 - 7.2 ms; * After the expiration of wd#1, it can generate a NMI, SCI, SMI, or * a system RESET and it starts wd#2 that unconditionally will RESET * the system when the counter reaches zero. * * 14-Dec-2001 Matt Domsch <[email protected]> * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT */ #define pr_fmt(fmt) … #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/types.h> #include <linux/timer.h> #include <linux/jiffies.h> #include <linux/miscdevice.h> #include <linux/watchdog.h> #include <linux/fs.h> #include <linux/ioport.h> #include <linux/notifier.h> #include <linux/reboot.h> #include <linux/init.h> #include <linux/io.h> #include <linux/uaccess.h> /* ports */ #define ZF_IOBASE … #define INDEX … #define DATA_B … #define DATA_W … #define DATA_D … /* indexes */ /* size */ #define ZFL_VERSION … #define CONTROL … #define STATUS … #define COUNTER_1 … #define COUNTER_2 … #define PULSE_LEN … /* controls */ #define ENABLE_WD1 … #define ENABLE_WD2 … #define RESET_WD1 … #define RESET_WD2 … #define GEN_SCI … #define GEN_NMI … #define GEN_SMI … #define GEN_RESET … /* utilities */ #define WD1 … #define WD2 … #define zf_writew(port, data) … #define zf_writeb(port, data) … #define zf_get_ZFL_version() … static unsigned short zf_readw(unsigned char port) { … } MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; static bool nowayout = … WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(…) …; #define PFX … static const struct watchdog_info zf_info = …; /* * action refers to action taken when watchdog resets * 0 = GEN_RESET * 1 = GEN_SMI * 2 = GEN_NMI * 3 = GEN_SCI * defaults to GEN_RESET (0) */ static int action; module_param(action, int, 0); MODULE_PARM_DESC(…) …; static void zf_ping(struct timer_list *unused); static int zf_action = …; static unsigned long zf_is_open; static char zf_expect_close; static DEFINE_SPINLOCK(zf_port_lock); static DEFINE_TIMER(zf_timer, zf_ping); static unsigned long next_heartbeat; /* timeout for user land heart beat (10 seconds) */ #define ZF_USER_TIMEO … /* timeout for hardware watchdog (~500ms) */ #define ZF_HW_TIMEO … /* number of ticks on WD#1 (driven by a 32KHz clock, 2s) */ #define ZF_CTIMEOUT … #ifndef ZF_DEBUG #define dprintk(format, args...) … #else #define dprintk … #endif static inline void zf_set_status(unsigned char new) { … } /* CONTROL register functions */ static inline unsigned short zf_get_control(void) { … } static inline void zf_set_control(unsigned short new) { … } /* WD#? counter functions */ /* * Just set counter value */ static inline void zf_set_timer(unsigned short new, unsigned char n) { … } /* * stop hardware timer */ static void zf_timer_off(void) { … } /* * start hardware timer */ static void zf_timer_on(void) { … } static void zf_ping(struct timer_list *unused) { … } static ssize_t zf_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { … } static long zf_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { … } static int zf_open(struct inode *inode, struct file *file) { … } static int zf_close(struct inode *inode, struct file *file) { … } /* * Notifier for system down */ static int zf_notify_sys(struct notifier_block *this, unsigned long code, void *unused) { … } static const struct file_operations zf_fops = …; static struct miscdevice zf_miscdev = …; /* * The device needs to learn about soft shutdowns in order to * turn the timebomb registers off. */ static struct notifier_block zf_notifier = …; static void __init zf_show_action(int act) { … } static int __init zf_init(void) { … } static void __exit zf_exit(void) { … } module_init(…) …; module_exit(zf_exit);
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