1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
460 lines
10 KiB
C
460 lines
10 KiB
C
/*
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* Wdt977 0.03: A Watchdog Device for Netwinder W83977AF chip
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*
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* (c) Copyright 1998 Rebel.com (Woody Suwalski <woody@netwinder.org>)
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*
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* -----------------------
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* -----------------------
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* 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
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* Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
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* 19-Dec-2001 Woody Suwalski: Netwinder fixes, ioctl interface
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* 06-Jan-2002 Woody Suwalski: For compatibility, convert all timeouts
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* from minutes to seconds.
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* 07-Jul-2003 Daniele Bellucci: Audit return code of misc_register in
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* nwwatchdog_init.
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/miscdevice.h>
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#include <linux/init.h>
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#include <linux/watchdog.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <asm/io.h>
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#include <asm/system.h>
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#include <asm/mach-types.h>
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#include <asm/uaccess.h>
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#define PFX "Wdt977: "
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#define WATCHDOG_MINOR 130
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#define DEFAULT_TIMEOUT 60 /* default timeout in seconds */
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static int timeout = DEFAULT_TIMEOUT;
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static int timeoutM; /* timeout in minutes */
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static unsigned long timer_alive;
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static int testmode;
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static char expect_close;
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module_param(timeout, int, 0);
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MODULE_PARM_DESC(timeout,"Watchdog timeout in seconds (60..15300), default=" __MODULE_STRING(DEFAULT_TIMEOUT) ")");
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module_param(testmode, int, 0);
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MODULE_PARM_DESC(testmode,"Watchdog testmode (1 = no reboot), default=0");
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#ifdef CONFIG_WATCHDOG_NOWAYOUT
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static int nowayout = 1;
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#else
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static int nowayout = 0;
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#endif
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module_param(nowayout, int, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
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/*
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* Start the watchdog
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*/
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static int wdt977_start(void)
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{
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/* unlock the SuperIO chip */
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outb(0x87,0x370);
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outb(0x87,0x370);
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/* select device Aux2 (device=8) and set watchdog regs F2, F3 and F4
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* F2 has the timeout in minutes
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* F3 could be set to the POWER LED blink (with GP17 set to PowerLed)
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* at timeout, and to reset timer on kbd/mouse activity (not impl.)
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* F4 is used to just clear the TIMEOUT'ed state (bit 0)
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*/
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outb(0x07,0x370);
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outb(0x08,0x371);
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outb(0xF2,0x370);
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outb(timeoutM,0x371);
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outb(0xF3,0x370);
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outb(0x00,0x371); /* another setting is 0E for kbd/mouse/LED */
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outb(0xF4,0x370);
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outb(0x00,0x371);
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/* at last select device Aux1 (dev=7) and set GP16 as a watchdog output */
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/* in test mode watch the bit 1 on F4 to indicate "triggered" */
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if (!testmode)
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{
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outb(0x07,0x370);
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outb(0x07,0x371);
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outb(0xE6,0x370);
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outb(0x08,0x371);
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}
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/* lock the SuperIO chip */
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outb(0xAA,0x370);
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printk(KERN_INFO PFX "activated.\n");
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return 0;
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}
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/*
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* Stop the watchdog
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*/
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static int wdt977_stop(void)
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{
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/* unlock the SuperIO chip */
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outb(0x87,0x370);
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outb(0x87,0x370);
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/* select device Aux2 (device=8) and set watchdog regs F2,F3 and F4
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* F3 is reset to its default state
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* F4 can clear the TIMEOUT'ed state (bit 0) - back to default
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* We can not use GP17 as a PowerLed, as we use its usage as a RedLed
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*/
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outb(0x07,0x370);
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outb(0x08,0x371);
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outb(0xF2,0x370);
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outb(0xFF,0x371);
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outb(0xF3,0x370);
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outb(0x00,0x371);
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outb(0xF4,0x370);
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outb(0x00,0x371);
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outb(0xF2,0x370);
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outb(0x00,0x371);
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/* at last select device Aux1 (dev=7) and set GP16 as a watchdog output */
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outb(0x07,0x370);
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outb(0x07,0x371);
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outb(0xE6,0x370);
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outb(0x08,0x371);
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/* lock the SuperIO chip */
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outb(0xAA,0x370);
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printk(KERN_INFO PFX "shutdown.\n");
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return 0;
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}
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/*
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* Send a keepalive ping to the watchdog
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* This is done by simply re-writing the timeout to reg. 0xF2
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*/
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static int wdt977_keepalive(void)
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{
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/* unlock the SuperIO chip */
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outb(0x87,0x370);
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outb(0x87,0x370);
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/* select device Aux2 (device=8) and kicks watchdog reg F2 */
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/* F2 has the timeout in minutes */
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outb(0x07,0x370);
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outb(0x08,0x371);
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outb(0xF2,0x370);
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outb(timeoutM,0x371);
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/* lock the SuperIO chip */
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outb(0xAA,0x370);
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return 0;
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}
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/*
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* Set the watchdog timeout value
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*/
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static int wdt977_set_timeout(int t)
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{
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int tmrval;
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/* convert seconds to minutes, rounding up */
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tmrval = (t + 59) / 60;
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if (machine_is_netwinder()) {
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/* we have a hw bug somewhere, so each 977 minute is actually only 30sec
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* this limits the max timeout to half of device max of 255 minutes...
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*/
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tmrval += tmrval;
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}
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if ((tmrval < 1) || (tmrval > 255))
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return -EINVAL;
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/* timeout is the timeout in seconds, timeoutM is the timeout in minutes) */
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timeout = t;
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timeoutM = tmrval;
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return 0;
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}
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/*
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* Get the watchdog status
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*/
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static int wdt977_get_status(int *status)
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{
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int new_status;
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*status=0;
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/* unlock the SuperIO chip */
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outb(0x87,0x370);
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outb(0x87,0x370);
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/* select device Aux2 (device=8) and read watchdog reg F4 */
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outb(0x07,0x370);
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outb(0x08,0x371);
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outb(0xF4,0x370);
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new_status = inb(0x371);
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/* lock the SuperIO chip */
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outb(0xAA,0x370);
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if (new_status & 1)
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*status |= WDIOF_CARDRESET;
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return 0;
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}
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/*
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* /dev/watchdog handling
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*/
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static int wdt977_open(struct inode *inode, struct file *file)
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{
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/* If the watchdog is alive we don't need to start it again */
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if( test_and_set_bit(0,&timer_alive) )
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return -EBUSY;
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if (nowayout)
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__module_get(THIS_MODULE);
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wdt977_start();
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return nonseekable_open(inode, file);
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}
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static int wdt977_release(struct inode *inode, struct file *file)
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{
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/*
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* Shut off the timer.
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* Lock it in if it's a module and we set nowayout
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*/
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if (expect_close == 42)
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{
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wdt977_stop();
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clear_bit(0,&timer_alive);
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} else {
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printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
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wdt977_keepalive();
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}
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expect_close = 0;
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return 0;
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}
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/*
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* wdt977_write:
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* @file: file handle to the watchdog
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* @buf: buffer to write (unused as data does not matter here
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* @count: count of bytes
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* @ppos: pointer to the position to write. No seeks allowed
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*
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* A write to a watchdog device is defined as a keepalive signal. Any
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* write of data will do, as we we don't define content meaning.
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*/
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static ssize_t wdt977_write(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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if (count) {
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if (!nowayout) {
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size_t i;
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/* In case it was set long ago */
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expect_close = 0;
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for (i = 0; i != count; i++) {
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char c;
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if (get_user(c, buf + i))
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return -EFAULT;
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if (c == 'V')
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expect_close = 42;
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}
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}
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wdt977_keepalive();
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}
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return count;
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}
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/*
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* wdt977_ioctl:
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* @inode: inode of the device
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* @file: file handle to the device
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* @cmd: watchdog command
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* @arg: argument pointer
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*
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* The watchdog API defines a common set of functions for all watchdogs
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* according to their available features.
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*/
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static struct watchdog_info ident = {
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.options = WDIOF_SETTIMEOUT |
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WDIOF_MAGICCLOSE |
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WDIOF_KEEPALIVEPING,
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.firmware_version = 1,
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.identity = "Winbond 83977",
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};
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static int wdt977_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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int status;
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int new_options, retval = -EINVAL;
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int new_timeout;
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union {
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struct watchdog_info __user *ident;
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int __user *i;
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} uarg;
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uarg.i = (int __user *)arg;
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switch(cmd)
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{
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default:
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return -ENOIOCTLCMD;
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case WDIOC_GETSUPPORT:
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return copy_to_user(uarg.ident, &ident,
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sizeof(ident)) ? -EFAULT : 0;
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case WDIOC_GETSTATUS:
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wdt977_get_status(&status);
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return put_user(status, uarg.i);
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, uarg.i);
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case WDIOC_KEEPALIVE:
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wdt977_keepalive();
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return 0;
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case WDIOC_SETOPTIONS:
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if (get_user (new_options, uarg.i))
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return -EFAULT;
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if (new_options & WDIOS_DISABLECARD) {
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wdt977_stop();
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retval = 0;
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}
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if (new_options & WDIOS_ENABLECARD) {
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wdt977_start();
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retval = 0;
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}
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return retval;
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case WDIOC_SETTIMEOUT:
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if (get_user(new_timeout, uarg.i))
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return -EFAULT;
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if (wdt977_set_timeout(new_timeout))
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return -EINVAL;
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wdt977_keepalive();
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/* Fall */
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case WDIOC_GETTIMEOUT:
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return put_user(timeout, uarg.i);
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}
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}
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static int wdt977_notify_sys(struct notifier_block *this, unsigned long code,
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void *unused)
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{
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if(code==SYS_DOWN || code==SYS_HALT)
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wdt977_stop();
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return NOTIFY_DONE;
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}
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static struct file_operations wdt977_fops=
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{
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = wdt977_write,
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.ioctl = wdt977_ioctl,
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.open = wdt977_open,
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.release = wdt977_release,
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};
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static struct miscdevice wdt977_miscdev=
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{
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &wdt977_fops,
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};
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static struct notifier_block wdt977_notifier = {
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.notifier_call = wdt977_notify_sys,
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};
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static int __init nwwatchdog_init(void)
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{
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int retval;
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if (!machine_is_netwinder())
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return -ENODEV;
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/* Check that the timeout value is within it's range ; if not reset to the default */
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if (wdt977_set_timeout(timeout)) {
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wdt977_set_timeout(DEFAULT_TIMEOUT);
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printk(KERN_INFO PFX "timeout value must be 60<timeout<15300, using %d\n",
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DEFAULT_TIMEOUT);
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}
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retval = register_reboot_notifier(&wdt977_notifier);
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if (retval) {
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printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
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retval);
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return retval;
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}
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retval = misc_register(&wdt977_miscdev);
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if (retval) {
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printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
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WATCHDOG_MINOR, retval);
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unregister_reboot_notifier(&wdt977_notifier);
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return retval;
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}
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printk(KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d, testmode = %i)\n",
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timeout, nowayout, testmode);
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return 0;
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}
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static void __exit nwwatchdog_exit(void)
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{
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misc_deregister(&wdt977_miscdev);
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unregister_reboot_notifier(&wdt977_notifier);
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}
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module_init(nwwatchdog_init);
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module_exit(nwwatchdog_exit);
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MODULE_AUTHOR("Woody Suwalski <woody@netwinder.org>");
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MODULE_DESCRIPTION("W83977AF Watchdog driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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