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506 lines
12 KiB
506 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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 <[email protected]>) |
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* |
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* ----------------------- |
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* |
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* ----------------------- |
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* 14-Dec-2001 Matt Domsch <[email protected]> |
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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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* 25-Oct-2005 Woody Suwalski: Convert addresses to #defs, add spinlocks |
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* remove limitiation to be used on |
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* Netwinders only |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/module.h> |
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#include <linux/moduleparam.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/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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#include <linux/io.h> |
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#include <linux/uaccess.h> |
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#include <asm/mach-types.h> |
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#define WATCHDOG_VERSION "0.04" |
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#define WATCHDOG_NAME "Wdt977" |
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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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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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static DEFINE_SPINLOCK(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=" |
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__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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static bool nowayout = WATCHDOG_NOWAYOUT; |
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module_param(nowayout, bool, 0); |
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MODULE_PARM_DESC(nowayout, |
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"Watchdog cannot be stopped once started (default=" |
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__MODULE_STRING(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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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_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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* 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_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 |
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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 |
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* watchdog output. In test mode watch the bit 1 on F4 to |
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* indicate "triggered" |
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*/ |
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if (!testmode) { |
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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_p(LOCK_DATA, IO_INDEX_PORT); |
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spin_unlock_irqrestore(&spinlock, flags); |
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pr_info("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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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_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_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 |
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GP16 as a watchdog output */ |
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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_p(LOCK_DATA, IO_INDEX_PORT); |
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spin_unlock_irqrestore(&spinlock, flags); |
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pr_info("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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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_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_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_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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/* |
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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 |
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* only 30sec. This limits the max timeout to half of device |
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* 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 |
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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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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_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_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_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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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 stream_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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wdt977_stop(); |
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clear_bit(0, &timer_alive); |
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} else { |
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wdt977_keepalive(); |
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pr_crit("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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} |
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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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/* 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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} |
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static const 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 = WATCHDOG_NAME, |
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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 long wdt977_ioctl(struct file *file, unsigned int cmd, |
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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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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_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_KEEPALIVE: |
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wdt977_keepalive(); |
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return 0; |
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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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fallthrough; |
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case WDIOC_GETTIMEOUT: |
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return put_user(timeout, uarg.i); |
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default: |
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return -ENOTTY; |
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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 const struct file_operations wdt977_fops = { |
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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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.unlocked_ioctl = wdt977_ioctl, |
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.compat_ioctl = compat_ptr_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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.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 wd977_init(void) |
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{ |
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int rc; |
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pr_info("driver v%s\n", WATCHDOG_VERSION); |
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/* Check that the timeout value is within its range; |
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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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pr_info("timeout value must be 60 < timeout < 15300, using %d\n", |
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DEFAULT_TIMEOUT); |
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} |
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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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if (!request_region(IO_INDEX_PORT, 2, WATCHDOG_NAME)) { |
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pr_err("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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rc = register_reboot_notifier(&wdt977_notifier); |
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if (rc) { |
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pr_err("cannot register reboot notifier (err=%d)\n", rc); |
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goto err_out_region; |
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} |
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rc = misc_register(&wdt977_miscdev); |
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if (rc) { |
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pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
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wdt977_miscdev.minor, rc); |
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goto err_out_reboot; |
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} |
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pr_info("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_reboot: |
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unregister_reboot_notifier(&wdt977_notifier); |
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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 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(wd977_init); |
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module_exit(wd977_exit); |
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MODULE_AUTHOR("Woody Suwalski <[email protected]>"); |
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MODULE_DESCRIPTION("W83977AF Watchdog driver"); |
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MODULE_LICENSE("GPL");
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