/* *	Eurotech CPU-1220/1410 on board WDT driver for Linux 2.4.x * *	(c) Copyright 2001 Ascensit <support@ascensit.com> *	(c) Copyright 2001 Rodolfo Giometti <giometti@ascensit.com> * *	Based on wdt.c. *	Original copyright messages: * *      (c) Copyright 1996-1997 Alan Cox <alan@redhat.com>, All Rights Reserved. *                              http://www.redhat.com * *      This program is free software; you can redistribute it and/or *      modify it under the terms of the GNU General Public License *      as published by the Free Software Foundation; either version *      2 of the License, or (at your option) any later version. * *      Neither Alan Cox nor CymruNet Ltd. admit liability nor provide *      warranty for any of this software. This material is provided *      "AS-IS" and at no charge. * *      (c) Copyright 1995    Alan Cox <alan@lxorguk.ukuu.org.uk>* */#include <linux/config.h>#include <linux/module.h>#include <linux/version.h>#include <linux/types.h>#include <linux/errno.h>#include <linux/kernel.h>#include <linux/sched.h>#include <linux/smp_lock.h>#include <linux/miscdevice.h>#include <linux/watchdog.h>#include <linux/slab.h>#include <linux/ioport.h>#include <linux/fcntl.h>#include <asm/io.h>#include <asm/uaccess.h>#include <asm/system.h>#include <linux/notifier.h>#include <linux/reboot.h>#include <linux/init.h>#include <linux/spinlock.h>#include <linux/smp_lock.h>static int eurwdt_is_open;static int eurwdt_timeout; static spinlock_t eurwdt_lock; /* *      You must set these - there is no sane way to probe for this board. *      You can use wdt=x,y to set these now. */ static int io = 0x3f0;static int irq = 10;static char *ev = "int"; #define WDT_TIMEOUT		60                /* 1 minute *//* * Some symbolic names  */#define WDT_CTRL_REG		0x30#define WDT_OUTPIN_CFG		0xe2   #define WDT_EVENT_INT	   0x00   #define WDT_EVENT_REBOOT	   0x08#define WDT_UNIT_SEL		0xf1   #define WDT_UNIT_SECS	   0x80#define WDT_TIMEOUT_VAL		0xf2#define WDT_TIMER_CFG		0xf3 #ifndef MODULE/** *      eurwdt_setup: *      @str: command line string * *      Setup options. The board isn't really probe-able so we have to *      get the user to tell us the configuration. Sane people build it *      modular but the others come here. */ static int __init eurwdt_setup(char *str){   int ints[4];    str = get_options (str, ARRAY_SIZE(ints), ints);    if (ints[0] > 0) {      io = ints[1];      if (ints[0] > 1)         irq = ints[2];   }    return 1;} __setup("wdt=", eurwdt_setup);#endif /* !MODULE */ MODULE_PARM(io, "i");MODULE_PARM_DESC(io, "Eurotech WDT io port (default=0x3f0)");MODULE_PARM(irq, "i");MODULE_PARM_DESC(irq, "Eurotech WDT irq (default=10)");MODULE_PARM(ev, "s");MODULE_PARM_DESC(ev, "Eurotech WDT event type (default is `reboot')");/* *      Programming support */static inline void eurwdt_write_reg(u8 index, u8 data){   outb(index, io);   outb(data, io+1);}static inline void eurwdt_lock_chip(void){   outb(0xaa, io);}static inline void eurwdt_unlock_chip(void){   outb(0x55, io);   eurwdt_write_reg(0x07, 0x08);   /* set the logical device */}static inline void eurwdt_set_timeout(int timeout){   eurwdt_write_reg(WDT_TIMEOUT_VAL, (u8) timeout);}static inline void eurwdt_disable_timer(void){   eurwdt_set_timeout(0);} static void eurwdt_activate_timer(void){   eurwdt_disable_timer();   eurwdt_write_reg(WDT_CTRL_REG, 0x01);      /* activate the WDT */   eurwdt_write_reg(WDT_OUTPIN_CFG, !strcmp("int", ev) ?                                    WDT_EVENT_INT : WDT_EVENT_REBOOT);   /* Setting interrupt line */   if (irq == 2 || irq > 15 || irq < 0) {      printk(KERN_ERR ": invalid irq number\n");      irq = 0;   /* if invalid we disable interrupt */   }   if (irq == 0)      printk(KERN_INFO ": interrupt disabled\n");   eurwdt_write_reg(WDT_TIMER_CFG, irq<<4);   eurwdt_write_reg(WDT_UNIT_SEL, WDT_UNIT_SECS);   /* we use seconds */   eurwdt_set_timeout(0);                           /* the default timeout */ }/* *      Kernel methods. */ void eurwdt_interrupt(int irq, void *dev_id, struct pt_regs *regs){   printk(KERN_CRIT "timeout WDT timeout\n"); #ifdef ONLY_TESTING   printk(KERN_CRIT "Would Reboot.\n");#else   printk(KERN_CRIT "Initiating system reboot.\n");   machine_restart(NULL);#endif}/** *      eurwdt_ping: * *      Reload counter one with the watchdog timeout. */ static void eurwdt_ping(void){   /* Write the watchdog default value */   eurwdt_set_timeout(eurwdt_timeout);} /** *      eurwdt_write: *      @file: file handle to the watchdog *      @buf: buffer to write (unused as data does not matter here *      @count: count of bytes *      @ppos: pointer to the position to write. No seeks allowed * *      A write to a watchdog device is defined as a keepalive signal. Any *      write of data will do, as we we don't define content meaning. */ static ssize_t eurwdt_write(struct file *file, const char *buf, size_t count,loff_t *ppos){   /*  Can't seek (pwrite) on this device  */   if (ppos != &file->f_pos)      return -ESPIPE;    if (count) {      eurwdt_ping();   /* the default timeout */      return 1;   }   return 0;}/** *      eurwdt_ioctl: *      @inode: inode of the device *      @file: file handle to the device *      @cmd: watchdog command *      @arg: argument pointer * *      The watchdog API defines a common set of functions for all watchdogs *      according to their available features. */ static int eurwdt_ioctl(struct inode *inode, struct file *file,        unsigned int cmd, unsigned long arg){   static struct watchdog_info ident = {      options		: WDIOF_CARDRESET | WDIOF_SETTIMEOUT,      firmware_version	: 1,      identity		: "WDT Eurotech CPU-1220/1410"   };   int time;    switch(cmd) {      default:         return -ENOTTY;      case WDIOC_GETSUPPORT:         return copy_to_user((struct watchdog_info *)arg, &ident,               sizeof(ident)) ? -EFAULT : 0;       case WDIOC_GETBOOTSTATUS:         return put_user(0, (int *) arg);      case WDIOC_KEEPALIVE:         eurwdt_ping();         return 0;      case WDIOC_SETTIMEOUT:         if (copy_from_user(&time, (int *) arg, sizeof(int)))            return -EFAULT;         /* Sanity check */         if (time < 0 || time > 255)            return -EINVAL;         eurwdt_timeout = time;          eurwdt_set_timeout(time); 	 /* Fall */      case WDIOC_GETTIMEOUT:	 return put_user(eurwdt_timeout, (int *)arg);   }}/** *      eurwdt_open: *      @inode: inode of device *      @file: file handle to device * *      The misc device has been opened. The watchdog device is single *      open and on opening we load the counter. */ static int eurwdt_open(struct inode *inode, struct file *file){   switch (MINOR(inode->i_rdev)) {      case WATCHDOG_MINOR:         spin_lock(&eurwdt_lock);         if (eurwdt_is_open) {            spin_unlock(&eurwdt_lock);            return -EBUSY;         }         eurwdt_is_open = 1;         eurwdt_timeout = WDT_TIMEOUT;   /* initial timeout */         /* Activate the WDT */         eurwdt_activate_timer();                      spin_unlock(&eurwdt_lock);         MOD_INC_USE_COUNT;         return 0;         case TEMP_MINOR:            return 0;         default:            return -ENODEV;   }} /** *      eurwdt_release: *      @inode: inode to board *      @file: file handle to board * *      The watchdog has a configurable API. There is a religious dispute *      between people who want their watchdog to be able to shut down and *      those who want to be sure if the watchdog manager dies the machine *      reboots. In the former case we disable the counters, in the latter *      case you have to open it again very soon. */ static int eurwdt_release(struct inode *inode, struct file *file){   if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) {#ifndef CONFIG_WATCHDOG_NOWAYOUT      eurwdt_disable_timer();#endif      eurwdt_is_open = 0;      MOD_DEC_USE_COUNT;   }   return 0;} /** *      eurwdt_notify_sys: *      @this: our notifier block *      @code: the event being reported *      @unused: unused * *      Our notifier is called on system shutdowns. We want to turn the card *      off at reboot otherwise the machine will reboot again during memory *      test or worse yet during the following fsck. This would suck, in fact *      trust me - if it happens it does suck. */ static int eurwdt_notify_sys(struct notifier_block *this, unsigned long code,        void *unused){   if (code == SYS_DOWN || code == SYS_HALT) {      /* Turn the card off */      eurwdt_disable_timer();   }   return NOTIFY_DONE;} /* *      Kernel Interfaces */  static struct file_operations eurwdt_fops = {        owner:          THIS_MODULE,        llseek:         no_llseek,        write:          eurwdt_write,        ioctl:          eurwdt_ioctl,        open:           eurwdt_open,        release:        eurwdt_release,};static struct miscdevice eurwdt_miscdev ={        WATCHDOG_MINOR,        "watchdog",        &eurwdt_fops}; /* *      The WDT card needs to learn about soft shutdowns in order to *      turn the timebomb registers off. */ static struct notifier_block eurwdt_notifier ={        eurwdt_notify_sys,        NULL,        0}; /** *      cleanup_module: * *      Unload the watchdog. You cannot do this with any file handles open. *      If your watchdog is set to continue ticking on close and you unload *      it, well it keeps ticking. We won't get the interrupt but the board *      will not touch PC memory so all is fine. You just have to load a new *      module in 60 seconds or reboot. */ static void __exit eurwdt_exit(void){   eurwdt_lock_chip();   misc_deregister(&eurwdt_miscdev);   unregister_reboot_notifier(&eurwdt_notifier);   release_region(io, 2);   free_irq(irq, NULL);} /** *      eurwdt_init: * *      Set up the WDT watchdog board. After grabbing the resources  *      we require we need also to unlock the device. *      The open() function will actually kick the board off. */ static int __init eurwdt_init(void){   int ret;    ret = misc_register(&eurwdt_miscdev);   if (ret) {      printk(KERN_ERR "eurwdt: can't misc_register on minor=%d\n",            WATCHDOG_MINOR);      goto out;   }   ret = request_irq(irq, eurwdt_interrupt, SA_INTERRUPT, "eurwdt", NULL);   if(ret) {      printk(KERN_ERR "eurwdt: IRQ %d is not free.\n", irq);      goto outmisc;   }   if (!request_region(io, 2, "eurwdt")) {       printk(KERN_ERR "eurwdt: IO %X is not free.\n", io);       ret = -EBUSY;       goto outirq;   }   ret = register_reboot_notifier(&eurwdt_notifier);   if (ret) {      printk(KERN_ERR "eurwdt: can't register reboot notifier (err=%d)\n", ret);      goto outreg;   }   eurwdt_unlock_chip();    ret = 0;   printk(KERN_INFO "Eurotech WDT driver 0.01 at %X (Interrupt %d)"                    " - timeout event: %s\n",          io, irq, (!strcmp("int", ev) ? "int" : "reboot"));   spin_lock_init(&eurwdt_lock);   out:      return ret;    outreg:      release_region(io, 2);   outirq:      free_irq(irq, NULL);   outmisc:      misc_deregister(&eurwdt_miscdev);      goto out;} module_init(eurwdt_init);module_exit(eurwdt_exit); MODULE_AUTHOR("Rodolfo Giometti");MODULE_DESCRIPTION("Driver for Eurotech CPU-1220/1410 on board watchdog");MODULE_LICENSE("GPL");EXPORT_NO_SYMBOLS;