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[PATCH] ARM Netwinder watchdog wdt977 update
Cleanup for the ARM-only watchdog driver wdt977. This is probably the last update, since we want to merge with w83977f_wdt. Jose Goncalves has ported this driver to i386, so probably we can iron out configuration differences. Signed-off-by: Woody Suwalski <woodys@xandros.com> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Woody Suwalski
Linus Torvalds
parent
70c00ba0bb
commit
4dab06fa7b
@ -1,5 +1,5 @@
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/*
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* Wdt977 0.03: A Watchdog Device for Netwinder W83977AF chip
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* Wdt977 0.04: 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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@ -18,6 +18,8 @@
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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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* 25-Oct-2005 Woody Suwalski: Convert addresses to #defs, add spinlocks
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* remove limitiation to be used on Netwinders only
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*/
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#include <linux/module.h>
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@ -28,6 +30,7 @@
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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/ioport.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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@ -37,8 +40,18 @@
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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 WATCHDOG_VERSION "0.04"
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#define WATCHDOG_NAME "Wdt977"
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#define PFX WATCHDOG_NAME ": "
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#define DRIVER_VERSION WATCHDOG_NAME " driver, v" WATCHDOG_VERSION "\n"
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#define IO_INDEX_PORT 0x370 /* on some systems it can be 0x3F0 */
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#define IO_DATA_PORT (IO_INDEX_PORT+1)
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#define UNLOCK_DATA 0x87
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#define LOCK_DATA 0xAA
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#define DEVICE_REGISTER 0x07
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#define DEFAULT_TIMEOUT 60 /* default timeout in seconds */
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@ -47,6 +60,7 @@ 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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static spinlock_t spinlock;
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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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@ -63,9 +77,13 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CON
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static int wdt977_start(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&spinlock, flags);
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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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outb_p(UNLOCK_DATA, IO_INDEX_PORT);
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outb_p(UNLOCK_DATA, IO_INDEX_PORT);
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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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@ -73,28 +91,29 @@ static int wdt977_start(void)
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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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outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
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outb_p(0x08, IO_DATA_PORT);
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outb_p(0xF2, IO_INDEX_PORT);
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outb_p(timeoutM, IO_DATA_PORT);
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outb_p(0xF3, IO_INDEX_PORT);
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outb_p(0x00, IO_DATA_PORT); /* another setting is 0E for kbd/mouse/LED */
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outb_p(0xF4, IO_INDEX_PORT);
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outb_p(0x00, IO_DATA_PORT);
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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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outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
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outb_p(0x07, IO_DATA_PORT);
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outb_p(0xE6, IO_INDEX_PORT);
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outb_p(0x08, IO_DATA_PORT);
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}
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/* lock the SuperIO chip */
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outb(0xAA,0x370);
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outb_p(LOCK_DATA, IO_INDEX_PORT);
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spin_unlock_irqrestore(&spinlock, flags);
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printk(KERN_INFO PFX "activated.\n");
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return 0;
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@ -106,35 +125,39 @@ static int wdt977_start(void)
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static int wdt977_stop(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&spinlock, flags);
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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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outb_p(UNLOCK_DATA, IO_INDEX_PORT);
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outb_p(UNLOCK_DATA, IO_INDEX_PORT);
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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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outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
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outb_p(0x08, IO_DATA_PORT);
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outb_p(0xF2, IO_INDEX_PORT);
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outb_p(0xFF, IO_DATA_PORT);
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outb_p(0xF3, IO_INDEX_PORT);
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outb_p(0x00, IO_DATA_PORT);
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outb_p(0xF4, IO_INDEX_PORT);
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outb_p(0x00, IO_DATA_PORT);
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outb_p(0xF2, IO_INDEX_PORT);
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outb_p(0x00, IO_DATA_PORT);
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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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outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
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outb_p(0x07, IO_DATA_PORT);
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outb_p(0xE6, IO_INDEX_PORT);
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outb_p(0x08, IO_DATA_PORT);
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/* lock the SuperIO chip */
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outb(0xAA,0x370);
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outb_p(LOCK_DATA, IO_INDEX_PORT);
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spin_unlock_irqrestore(&spinlock, flags);
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printk(KERN_INFO PFX "shutdown.\n");
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return 0;
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@ -147,19 +170,23 @@ static int wdt977_stop(void)
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static int wdt977_keepalive(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&spinlock, flags);
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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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outb_p(UNLOCK_DATA, IO_INDEX_PORT);
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outb_p(UNLOCK_DATA, IO_INDEX_PORT);
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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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outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
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outb_p(0x08, IO_DATA_PORT);
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outb_p(0xF2, IO_INDEX_PORT);
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outb_p(timeoutM, IO_DATA_PORT);
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/* lock the SuperIO chip */
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outb(0xAA,0x370);
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outb_p(LOCK_DATA, IO_INDEX_PORT);
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spin_unlock_irqrestore(&spinlock, flags);
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return 0;
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}
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@ -198,22 +225,26 @@ static int wdt977_set_timeout(int t)
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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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unsigned long flags;
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*status=0;
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spin_lock_irqsave(&spinlock, flags);
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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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outb_p(UNLOCK_DATA, IO_INDEX_PORT);
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outb_p(UNLOCK_DATA, IO_INDEX_PORT);
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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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outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
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outb_p(0x08, IO_DATA_PORT);
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outb_p(0xF4, IO_INDEX_PORT);
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new_status = inb_p(IO_DATA_PORT);
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/* lock the SuperIO chip */
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outb(0xAA,0x370);
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outb_p(LOCK_DATA, IO_INDEX_PORT);
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spin_unlock_irqrestore(&spinlock, flags);
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*status=0;
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if (new_status & 1)
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*status |= WDIOF_CARDRESET;
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@ -249,8 +280,8 @@ static int wdt977_release(struct inode *inode, struct file *file)
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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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printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
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}
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expect_close = 0;
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return 0;
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@ -271,14 +302,17 @@ static int wdt977_release(struct inode *inode, struct file *file)
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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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if (count)
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{
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if (!nowayout)
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{
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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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for (i = 0; i != count; i++)
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{
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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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@ -287,6 +321,7 @@ static ssize_t wdt977_write(struct file *file, const char __user *buf,
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}
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}
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/* someone wrote to us, we should restart timer */
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wdt977_keepalive();
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}
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return count;
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@ -308,7 +343,7 @@ static struct watchdog_info ident = {
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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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.identity = WATCHDOG_NAME,
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};
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static int wdt977_ioctl(struct inode *inode, struct file *file,
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@ -405,50 +440,81 @@ 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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static int __init wd977_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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int rc;
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//if (!machine_is_netwinder())
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// return -ENODEV;
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printk(KERN_INFO PFX DRIVER_VERSION);
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spin_lock_init(&spinlock);
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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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if (wdt977_set_timeout(timeout))
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{
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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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/* on Netwinder the IOports are already reserved by
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* arch/arm/mach-footbridge/netwinder-hw.c
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*/
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if (!machine_is_netwinder())
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{
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if (!request_region(IO_INDEX_PORT, 2, WATCHDOG_NAME))
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{
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printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
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IO_INDEX_PORT);
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rc = -EIO;
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goto err_out;
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}
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}
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retval = misc_register(&wdt977_miscdev);
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if (retval) {
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rc = misc_register(&wdt977_miscdev);
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if (rc)
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{
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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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wdt977_miscdev.minor, rc);
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goto err_out_region;
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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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rc = register_reboot_notifier(&wdt977_notifier);
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if (rc)
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{
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printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
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rc);
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goto err_out_miscdev;
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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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err_out_miscdev:
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misc_deregister(&wdt977_miscdev);
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err_out_region:
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if (!machine_is_netwinder())
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release_region(IO_INDEX_PORT,2);
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err_out:
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return rc;
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}
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static void __exit nwwatchdog_exit(void)
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static void __exit wd977_exit(void)
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{
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wdt977_stop();
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misc_deregister(&wdt977_miscdev);
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unregister_reboot_notifier(&wdt977_notifier);
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release_region(IO_INDEX_PORT,2);
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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_init(wd977_init);
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module_exit(wd977_exit);
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MODULE_AUTHOR("Woody Suwalski <woody@netwinder.org>");
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MODULE_AUTHOR("Woody Suwalski <woodys@xandros.com>");
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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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