diff options
Diffstat (limited to 'drivers/char/watchdog/eurotechwdt.c')
| -rw-r--r-- | drivers/char/watchdog/eurotechwdt.c | 473 |
1 files changed, 0 insertions, 473 deletions
diff --git a/drivers/char/watchdog/eurotechwdt.c b/drivers/char/watchdog/eurotechwdt.c deleted file mode 100644 index b14e9d1f164..00000000000 --- a/drivers/char/watchdog/eurotechwdt.c +++ /dev/null @@ -1,473 +0,0 @@ -/* - * Eurotech CPU-1220/1410/1420 on board WDT driver - * - * (c) Copyright 2001 Ascensit <support@ascensit.com> - * (c) Copyright 2001 Rodolfo Giometti <giometti@ascensit.com> - * (c) Copyright 2002 Rob Radez <rob@osinvestor.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>* - */ - -/* Changelog: - * - * 2001 - Rodolfo Giometti - * Initial release - * - * 2002/04/25 - Rob Radez - * clean up #includes - * clean up locking - * make __setup param unique - * proper options in watchdog_info - * add WDIOC_GETSTATUS and WDIOC_SETOPTIONS ioctls - * add expect_close support - * - * 2002.05.30 - Joel Becker <joel.becker@oracle.com> - * Added Matt Domsch's nowayout module option. - */ - -/* - * The eurotech CPU-1220/1410/1420's watchdog is a part - * of the on-board SUPER I/O device SMSC FDC 37B782. - */ - -#include <linux/interrupt.h> -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/types.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 <asm/io.h> -#include <asm/uaccess.h> -#include <asm/system.h> - -static unsigned long eurwdt_is_open; -static int eurwdt_timeout; -static char eur_expect_close; - -/* - * You must set these - there is no sane way to probe for this board. - * You can use eurwdt=x,y to set these now. - */ - -static int io = 0x3f0; -static int irq = 10; -static char *ev = "int"; - -#define WDT_TIMEOUT 60 /* 1 minute */ - -static int nowayout = WATCHDOG_NOWAYOUT; -module_param(nowayout, int, 0); -MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); - -/* - * 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 - - -module_param(io, int, 0); -MODULE_PARM_DESC(io, "Eurotech WDT io port (default=0x3f0)"); -module_param(irq, int, 0); -MODULE_PARM_DESC(irq, "Eurotech WDT irq (default=10)"); -module_param(ev, charp, 0); -MODULE_PARM_DESC(ev, "Eurotech WDT event type (default is `int')"); - - -/* - * 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. - */ - -static irqreturn_t eurwdt_interrupt(int irq, void *dev_id) -{ - printk(KERN_CRIT "timeout WDT timeout\n"); - -#ifdef ONLY_TESTING - printk(KERN_CRIT "Would Reboot.\n"); -#else - printk(KERN_CRIT "Initiating system reboot.\n"); - emergency_restart(); -#endif - return IRQ_HANDLED; -} - - -/** - * 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 __user *buf, -size_t count, loff_t *ppos) -{ - if (count) { - if (!nowayout) { - size_t i; - - eur_expect_close = 0; - - for (i = 0; i != count; i++) { - char c; - if(get_user(c, buf+i)) - return -EFAULT; - if (c == 'V') - eur_expect_close = 42; - } - } - eurwdt_ping(); /* the default timeout */ - } - - return count; -} - -/** - * 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) -{ - void __user *argp = (void __user *)arg; - int __user *p = argp; - static struct watchdog_info ident = { - .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, - .firmware_version = 1, - .identity = "WDT Eurotech CPU-1220/1410", - }; - - int time; - int options, retval = -EINVAL; - - switch(cmd) { - default: - return -ENOTTY; - - case WDIOC_GETSUPPORT: - return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; - - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - return put_user(0, p); - - case WDIOC_KEEPALIVE: - eurwdt_ping(); - return 0; - - case WDIOC_SETTIMEOUT: - if (copy_from_user(&time, p, 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, p); - - case WDIOC_SETOPTIONS: - if (get_user(options, p)) - return -EFAULT; - if (options & WDIOS_DISABLECARD) { - eurwdt_disable_timer(); - retval = 0; - } - if (options & WDIOS_ENABLECARD) { - eurwdt_activate_timer(); - eurwdt_ping(); - retval = 0; - } - return retval; - } -} - -/** - * 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) -{ - if (test_and_set_bit(0, &eurwdt_is_open)) - return -EBUSY; - eurwdt_timeout = WDT_TIMEOUT; /* initial timeout */ - /* Activate the WDT */ - eurwdt_activate_timer(); - return nonseekable_open(inode, file); -} - -/** - * 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 (eur_expect_close == 42) { - eurwdt_disable_timer(); - } else { - printk(KERN_CRIT "eurwdt: Unexpected close, not stopping watchdog!\n"); - eurwdt_ping(); - } - clear_bit(0, &eurwdt_is_open); - eur_expect_close = 0; - 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 const 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 = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &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 = { - .notifier_call = eurwdt_notify_sys, -}; - -/** - * 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 = request_irq(irq, eurwdt_interrupt, IRQF_DISABLED, "eurwdt", NULL); - if(ret) { - printk(KERN_ERR "eurwdt: IRQ %d is not free.\n", irq); - goto out; - } - - 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; - } - - ret = misc_register(&eurwdt_miscdev); - if (ret) { - printk(KERN_ERR "eurwdt: can't misc_register on minor=%d\n", - WATCHDOG_MINOR); - goto outreboot; - } - - 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")); - -out: - return ret; - -outreboot: - unregister_reboot_notifier(&eurwdt_notifier); - -outreg: - release_region(io, 2); - -outirq: - free_irq(irq, NULL); - 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"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |