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drivers/watchdog/w83627hf_wdt.c
8.77 KB
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/* |
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* w83627hf/thf WDT driver * * (c) Copyright 2007 Vlad Drukker <vlad@storewiz.com> * added support for W83627THF. |
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* |
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* (c) Copyright 2003,2007 Pádraig Brady <P@draigBrady.com> |
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* * Based on advantechwdt.c which is based on wdt.c. * Original copyright messages: * * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl> * |
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* (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>, * All Rights Reserved. |
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* * 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. * |
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* (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk> |
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*/ #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> |
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#include <linux/spinlock.h> |
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#include <linux/io.h> #include <linux/uaccess.h> |
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#include <asm/system.h> |
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#define WATCHDOG_NAME "w83627hf/thf/hg WDT" |
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#define PFX WATCHDOG_NAME ": " #define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */ static unsigned long wdt_is_open; static char expect_close; |
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static DEFINE_SPINLOCK(io_lock); |
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/* You must set this - there is no sane way to probe for this board. */ static int wdt_io = 0x2E; module_param(wdt_io, int, 0); |
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MODULE_PARM_DESC(wdt_io, "w83627hf/thf WDT io port (default 0x2E)"); |
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static int timeout = WATCHDOG_TIMEOUT; /* in seconds */ module_param(timeout, int, 0); |
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MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1 <= timeout <= 255, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) "."); |
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static int nowayout = WATCHDOG_NOWAYOUT; |
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module_param(nowayout, int, 0); |
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
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/* * Kernel methods. */ #define WDT_EFER (wdt_io+0) /* Extended Function Enable Registers */ |
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#define WDT_EFIR (wdt_io+0) /* Extended Function Index Register (same as EFER) */ |
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#define WDT_EFDR (WDT_EFIR+1) /* Extended Function Data Register */ |
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static void w83627hf_select_wd_register(void) |
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{ |
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unsigned char c; |
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outb_p(0x87, WDT_EFER); /* Enter extended function mode */ outb_p(0x87, WDT_EFER); /* Again according to manual */ |
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outb(0x20, WDT_EFER); /* check chip version */ |
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c = inb(WDT_EFDR); |
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if (c == 0x82) { /* W83627THF */ |
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outb_p(0x2b, WDT_EFER); /* select GPIO3 */ c = ((inb_p(WDT_EFDR) & 0xf7) | 0x04); /* select WDT0 */ outb_p(0x2b, WDT_EFER); outb_p(c, WDT_EFDR); /* set GPIO3 to WDT0 */ |
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} else if (c == 0x88) { /* W83627EHF */ outb_p(0x2d, WDT_EFER); /* select GPIO5 */ c = inb_p(WDT_EFDR) & ~0x01; /* PIN77 -> WDT0# */ outb_p(0x2d, WDT_EFER); outb_p(c, WDT_EFDR); /* set GPIO5 to WDT0 */ |
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} |
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outb_p(0x07, WDT_EFER); /* point to logical device number reg */ outb_p(0x08, WDT_EFDR); /* select logical device 8 (GPIO2) */ outb_p(0x30, WDT_EFER); /* select CR30 */ outb_p(0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */ } |
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static void w83627hf_unselect_wd_register(void) |
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{ outb_p(0xAA, WDT_EFER); /* Leave extended function mode */ } /* tyan motherboards seem to set F5 to 0x4C ? * So explicitly init to appropriate value. */ |
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static void w83627hf_init(void) |
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{ unsigned char t; w83627hf_select_wd_register(); |
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outb_p(0xF6, WDT_EFER); /* Select CRF6 */ |
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t = inb_p(WDT_EFDR); /* read CRF6 */ |
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if (t != 0) { |
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printk(KERN_INFO PFX "Watchdog already running. Resetting timeout to %d sec ", timeout); |
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outb_p(timeout, WDT_EFDR); /* Write back to CRF6 */ } |
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outb_p(0xF5, WDT_EFER); /* Select CRF5 */ |
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t = inb_p(WDT_EFDR); /* read CRF5 */ t &= ~0x0C; /* set second mode & disable keyboard turning off watchdog */ |
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outb_p(t, WDT_EFDR); /* Write back to CRF5 */ |
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outb_p(0xF7, WDT_EFER); /* Select CRF7 */ |
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t = inb_p(WDT_EFDR); /* read CRF7 */ t &= ~0xC0; /* disable keyboard & mouse turning off watchdog */ |
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outb_p(t, WDT_EFDR); /* Write back to CRF7 */ |
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w83627hf_unselect_wd_register(); } |
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static void wdt_ctrl(int timeout) |
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{ |
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spin_lock(&io_lock); |
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w83627hf_select_wd_register(); outb_p(0xF6, WDT_EFER); /* Select CRF6 */ outb_p(timeout, WDT_EFDR); /* Write Timeout counter to CRF6 */ w83627hf_unselect_wd_register(); |
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spin_unlock(&io_lock); |
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} |
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static int wdt_ping(void) |
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{ wdt_ctrl(timeout); return 0; } |
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static int wdt_disable(void) |
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{ wdt_ctrl(0); return 0; } |
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static int wdt_set_heartbeat(int t) |
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{ |
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if (t < 1 || t > 255) |
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return -EINVAL; |
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timeout = t; return 0; } |
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static ssize_t wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) |
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{ if (count) { if (!nowayout) { size_t i; expect_close = 0; for (i = 0; i != count; i++) { char c; |
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if (get_user(c, buf + i)) |
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return -EFAULT; if (c == 'V') expect_close = 42; } } wdt_ping(); } return count; } |
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static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
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{ void __user *argp = (void __user *)arg; int __user *p = argp; int new_timeout; static struct watchdog_info ident = { |
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.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, |
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.firmware_version = 1, .identity = "W83627HF WDT", }; switch (cmd) { case WDIOC_GETSUPPORT: |
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if (copy_to_user(argp, &ident, sizeof(ident))) return -EFAULT; break; |
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case WDIOC_GETSTATUS: case WDIOC_GETBOOTSTATUS: |
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return put_user(0, p); |
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case WDIOC_SETOPTIONS: { |
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int options, retval = -EINVAL; |
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if (get_user(options, p)) return -EFAULT; if (options & WDIOS_DISABLECARD) { wdt_disable(); retval = 0; } if (options & WDIOS_ENABLECARD) { wdt_ping(); retval = 0; } return retval; |
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} |
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case WDIOC_KEEPALIVE: wdt_ping(); break; case WDIOC_SETTIMEOUT: if (get_user(new_timeout, p)) return -EFAULT; if (wdt_set_heartbeat(new_timeout)) return -EINVAL; wdt_ping(); /* Fall */ case WDIOC_GETTIMEOUT: return put_user(timeout, p); |
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default: |
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return -ENOTTY; |
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} return 0; } |
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static int wdt_open(struct inode *inode, struct file *file) |
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{ if (test_and_set_bit(0, &wdt_is_open)) return -EBUSY; /* * Activate */ wdt_ping(); return nonseekable_open(inode, file); } |
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static int wdt_close(struct inode *inode, struct file *file) |
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{ |
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if (expect_close == 42) |
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wdt_disable(); |
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else { printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog! "); |
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wdt_ping(); } expect_close = 0; clear_bit(0, &wdt_is_open); return 0; } /* * Notifier for system down */ |
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static int wdt_notify_sys(struct notifier_block *this, unsigned long code, |
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void *unused) { |
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if (code == SYS_DOWN || code == SYS_HALT) wdt_disable(); /* Turn the WDT off */ |
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return NOTIFY_DONE; } /* * Kernel Interfaces */ |
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static const struct file_operations wdt_fops = { |
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.owner = THIS_MODULE, .llseek = no_llseek, .write = wdt_write, |
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.unlocked_ioctl = wdt_ioctl, |
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.open = wdt_open, .release = wdt_close, }; static struct miscdevice wdt_miscdev = { .minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &wdt_fops, }; /* * The WDT needs to learn about soft shutdowns in order to * turn the timebomb registers off. */ static struct notifier_block wdt_notifier = { .notifier_call = wdt_notify_sys, }; |
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static int __init wdt_init(void) |
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{ int ret; |
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printk(KERN_INFO "WDT driver for the Winbond(TM) W83627HF/THF/HG Super I/O chip initialising. "); |
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if (wdt_set_heartbeat(timeout)) { wdt_set_heartbeat(WATCHDOG_TIMEOUT); |
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printk(KERN_INFO PFX "timeout value must be 1 <= timeout <= 255, using %d ", WATCHDOG_TIMEOUT); |
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} if (!request_region(wdt_io, 1, WATCHDOG_NAME)) { |
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printk(KERN_ERR PFX "I/O address 0x%04x already in use ", |
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wdt_io); ret = -EIO; goto out; } w83627hf_init(); ret = register_reboot_notifier(&wdt_notifier); if (ret != 0) { |
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printk(KERN_ERR PFX "cannot register reboot notifier (err=%d) ", ret); |
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goto unreg_regions; } ret = misc_register(&wdt_miscdev); if (ret != 0) { |
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printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d) ", WATCHDOG_MINOR, ret); |
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goto unreg_reboot; } |
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printk(KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d) ", timeout, nowayout); |
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out: return ret; unreg_reboot: unregister_reboot_notifier(&wdt_notifier); unreg_regions: release_region(wdt_io, 1); goto out; } |
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static void __exit wdt_exit(void) |
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{ misc_deregister(&wdt_miscdev); unregister_reboot_notifier(&wdt_notifier); |
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release_region(wdt_io, 1); |
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} module_init(wdt_init); module_exit(wdt_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Pádraig Brady <P@draigBrady.com>"); |
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MODULE_DESCRIPTION("w83627hf/thf WDT driver"); |
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MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |