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d017327893
This gets rid of the unnecessary license boilerplate, and avoids having to deal with individual patches one by one. No functional changes. Reviewed-by: Jerry Hoemann <jerry.hoemann@hpe.com> Acked-by: Sylvain Lemieux <slemieux.tyco@gmail.com> Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com> Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
742 lines
17 KiB
C
742 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Industrial Computer Source PCI-WDT500/501 driver
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*
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* (c) Copyright 1996-1997 Alan Cox <alan@lxorguk.ukuu.org.uk>,
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* All Rights Reserved.
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*
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* Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
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* warranty for any of this software. This material is provided
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* "AS-IS" and at no charge.
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*
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* (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
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*
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* Release 0.10.
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*
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* Fixes
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* Dave Gregorich : Modularisation and minor bugs
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* Alan Cox : Added the watchdog ioctl() stuff
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* Alan Cox : Fixed the reboot problem (as noted by
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* Matt Crocker).
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* Alan Cox : Added wdt= boot option
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* Alan Cox : Cleaned up copy/user stuff
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* Tim Hockin : Added insmod parameters, comment cleanup
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* Parameterized timeout
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* JP Nollmann : Added support for PCI wdt501p
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* Alan Cox : Split ISA and PCI cards into two drivers
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* Jeff Garzik : PCI cleanups
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* Tigran Aivazian : Restructured wdtpci_init_one() to handle
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* failures
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* Joel Becker : Added WDIOC_GET/SETTIMEOUT
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* Zwane Mwaikambo : Magic char closing, locking changes,
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* cleanups
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* Matt Domsch : nowayout module option
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/interrupt.h>
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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/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/fs.h>
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#include <linux/pci.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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#define WDT_IS_PCI
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#include "wd501p.h"
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/* We can only use 1 card due to the /dev/watchdog restriction */
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static int dev_count;
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static unsigned long open_lock;
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static DEFINE_SPINLOCK(wdtpci_lock);
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static char expect_close;
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static resource_size_t io;
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static int irq;
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/* Default timeout */
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#define WD_TIMO 60 /* Default heartbeat = 60 seconds */
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static int heartbeat = WD_TIMO;
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static int wd_heartbeat;
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module_param(heartbeat, int, 0);
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MODULE_PARM_DESC(heartbeat,
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"Watchdog heartbeat in seconds. (0<heartbeat<65536, default="
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__MODULE_STRING(WD_TIMO) ")");
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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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/* Support for the Fan Tachometer on the PCI-WDT501 */
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static int tachometer;
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module_param(tachometer, int, 0);
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MODULE_PARM_DESC(tachometer,
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"PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
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static int type = 500;
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module_param(type, int, 0);
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MODULE_PARM_DESC(type,
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"PCI-WDT501 Card type (500 or 501 , default=500)");
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/*
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* Programming support
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*/
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static void wdtpci_ctr_mode(int ctr, int mode)
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{
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ctr <<= 6;
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ctr |= 0x30;
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ctr |= (mode << 1);
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outb(ctr, WDT_CR);
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udelay(8);
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}
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static void wdtpci_ctr_load(int ctr, int val)
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{
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outb(val & 0xFF, WDT_COUNT0 + ctr);
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udelay(8);
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outb(val >> 8, WDT_COUNT0 + ctr);
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udelay(8);
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}
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/**
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* wdtpci_start:
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*
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* Start the watchdog driver.
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*/
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static int wdtpci_start(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&wdtpci_lock, flags);
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/*
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* "pet" the watchdog, as Access says.
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* This resets the clock outputs.
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*/
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inb(WDT_DC); /* Disable watchdog */
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udelay(8);
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wdtpci_ctr_mode(2, 0); /* Program CTR2 for Mode 0:
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Pulse on Terminal Count */
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outb(0, WDT_DC); /* Enable watchdog */
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udelay(8);
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inb(WDT_DC); /* Disable watchdog */
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udelay(8);
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outb(0, WDT_CLOCK); /* 2.0833MHz clock */
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udelay(8);
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inb(WDT_BUZZER); /* disable */
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udelay(8);
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inb(WDT_OPTONOTRST); /* disable */
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udelay(8);
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inb(WDT_OPTORST); /* disable */
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udelay(8);
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inb(WDT_PROGOUT); /* disable */
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udelay(8);
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wdtpci_ctr_mode(0, 3); /* Program CTR0 for Mode 3:
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Square Wave Generator */
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wdtpci_ctr_mode(1, 2); /* Program CTR1 for Mode 2:
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Rate Generator */
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wdtpci_ctr_mode(2, 1); /* Program CTR2 for Mode 1:
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Retriggerable One-Shot */
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wdtpci_ctr_load(0, 20833); /* count at 100Hz */
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wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
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/* DO NOT LOAD CTR2 on PCI card! -- JPN */
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outb(0, WDT_DC); /* Enable watchdog */
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udelay(8);
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spin_unlock_irqrestore(&wdtpci_lock, flags);
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return 0;
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}
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/**
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* wdtpci_stop:
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*
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* Stop the watchdog driver.
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*/
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static int wdtpci_stop(void)
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{
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unsigned long flags;
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/* Turn the card off */
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spin_lock_irqsave(&wdtpci_lock, flags);
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inb(WDT_DC); /* Disable watchdog */
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udelay(8);
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wdtpci_ctr_load(2, 0); /* 0 length reset pulses now */
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spin_unlock_irqrestore(&wdtpci_lock, flags);
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return 0;
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}
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/**
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* wdtpci_ping:
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*
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* Reload counter one with the watchdog heartbeat. We don't bother
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* reloading the cascade counter.
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*/
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static int wdtpci_ping(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&wdtpci_lock, flags);
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/* Write a watchdog value */
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inb(WDT_DC); /* Disable watchdog */
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udelay(8);
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wdtpci_ctr_mode(1, 2); /* Re-Program CTR1 for Mode 2:
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Rate Generator */
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wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
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outb(0, WDT_DC); /* Enable watchdog */
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udelay(8);
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spin_unlock_irqrestore(&wdtpci_lock, flags);
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return 0;
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}
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/**
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* wdtpci_set_heartbeat:
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* @t: the new heartbeat value that needs to be set.
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*
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* Set a new heartbeat value for the watchdog device. If the heartbeat
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* value is incorrect we keep the old value and return -EINVAL.
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* If successful we return 0.
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*/
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static int wdtpci_set_heartbeat(int t)
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{
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/* Arbitrary, can't find the card's limits */
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if (t < 1 || t > 65535)
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return -EINVAL;
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heartbeat = t;
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wd_heartbeat = t * 100;
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return 0;
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}
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/**
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* wdtpci_get_status:
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* @status: the new status.
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*
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* Extract the status information from a WDT watchdog device. There are
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* several board variants so we have to know which bits are valid. Some
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* bits default to one and some to zero in order to be maximally painful.
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*
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* we then map the bits onto the status ioctl flags.
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*/
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static int wdtpci_get_status(int *status)
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{
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unsigned char new_status;
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unsigned long flags;
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spin_lock_irqsave(&wdtpci_lock, flags);
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new_status = inb(WDT_SR);
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spin_unlock_irqrestore(&wdtpci_lock, flags);
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*status = 0;
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if (new_status & WDC_SR_ISOI0)
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*status |= WDIOF_EXTERN1;
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if (new_status & WDC_SR_ISII1)
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*status |= WDIOF_EXTERN2;
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if (type == 501) {
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if (!(new_status & WDC_SR_TGOOD))
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*status |= WDIOF_OVERHEAT;
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if (!(new_status & WDC_SR_PSUOVER))
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*status |= WDIOF_POWEROVER;
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if (!(new_status & WDC_SR_PSUUNDR))
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*status |= WDIOF_POWERUNDER;
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if (tachometer) {
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if (!(new_status & WDC_SR_FANGOOD))
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*status |= WDIOF_FANFAULT;
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}
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}
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return 0;
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}
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/**
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* wdtpci_get_temperature:
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*
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* Reports the temperature in degrees Fahrenheit. The API is in
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* farenheit. It was designed by an imperial measurement luddite.
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*/
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static int wdtpci_get_temperature(int *temperature)
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{
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unsigned short c;
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unsigned long flags;
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spin_lock_irqsave(&wdtpci_lock, flags);
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c = inb(WDT_RT);
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udelay(8);
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spin_unlock_irqrestore(&wdtpci_lock, flags);
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*temperature = (c * 11 / 15) + 7;
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return 0;
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}
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/**
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* wdtpci_interrupt:
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* @irq: Interrupt number
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* @dev_id: Unused as we don't allow multiple devices.
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*
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* Handle an interrupt from the board. These are raised when the status
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* map changes in what the board considers an interesting way. That means
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* a failure condition occurring.
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*/
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static irqreturn_t wdtpci_interrupt(int irq, void *dev_id)
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{
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/*
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* Read the status register see what is up and
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* then printk it.
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*/
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unsigned char status;
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spin_lock(&wdtpci_lock);
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status = inb(WDT_SR);
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udelay(8);
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pr_crit("status %d\n", status);
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if (type == 501) {
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if (!(status & WDC_SR_TGOOD)) {
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pr_crit("Overheat alarm (%d)\n", inb(WDT_RT));
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udelay(8);
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}
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if (!(status & WDC_SR_PSUOVER))
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pr_crit("PSU over voltage\n");
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if (!(status & WDC_SR_PSUUNDR))
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pr_crit("PSU under voltage\n");
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if (tachometer) {
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if (!(status & WDC_SR_FANGOOD))
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pr_crit("Possible fan fault\n");
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}
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}
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if (!(status & WDC_SR_WCCR)) {
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#ifdef SOFTWARE_REBOOT
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#ifdef ONLY_TESTING
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pr_crit("Would Reboot\n");
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#else
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pr_crit("Initiating system reboot\n");
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emergency_restart();
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#endif
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#else
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pr_crit("Reset in 5ms\n");
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#endif
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}
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spin_unlock(&wdtpci_lock);
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return IRQ_HANDLED;
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}
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/**
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* wdtpci_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 wdtpci_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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wdtpci_ping();
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}
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return count;
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}
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/**
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* wdtpci_ioctl:
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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. We only actually usefully support
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* querying capabilities and current status.
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*/
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static long wdtpci_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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int __user *p = argp;
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int new_heartbeat;
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int status;
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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 = "PCI-WDT500/501",
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};
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/* Add options according to the card we have */
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ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
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if (type == 501) {
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ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|
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WDIOF_POWEROVER);
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if (tachometer)
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ident.options |= WDIOF_FANFAULT;
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}
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
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case WDIOC_GETSTATUS:
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wdtpci_get_status(&status);
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return put_user(status, p);
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, p);
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case WDIOC_KEEPALIVE:
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wdtpci_ping();
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return 0;
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case WDIOC_SETTIMEOUT:
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if (get_user(new_heartbeat, p))
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return -EFAULT;
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if (wdtpci_set_heartbeat(new_heartbeat))
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return -EINVAL;
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wdtpci_ping();
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/* fall through */
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case WDIOC_GETTIMEOUT:
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return put_user(heartbeat, p);
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default:
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return -ENOTTY;
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}
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}
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/**
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* wdtpci_open:
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* @inode: inode of device
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* @file: file handle to device
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*
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* The watchdog device has been opened. The watchdog device is single
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* open and on opening we load the counters. Counter zero is a 100Hz
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* cascade, into counter 1 which downcounts to reboot. When the counter
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* triggers counter 2 downcounts the length of the reset pulse which
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* set set to be as long as possible.
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*/
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static int wdtpci_open(struct inode *inode, struct file *file)
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{
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if (test_and_set_bit(0, &open_lock))
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return -EBUSY;
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if (nowayout)
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__module_get(THIS_MODULE);
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/*
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* Activate
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*/
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wdtpci_start();
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return stream_open(inode, file);
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}
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/**
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* wdtpci_release:
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* @inode: inode to board
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* @file: file handle to board
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*
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* The watchdog has a configurable API. There is a religious dispute
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* between people who want their watchdog to be able to shut down and
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* those who want to be sure if the watchdog manager dies the machine
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* reboots. In the former case we disable the counters, in the latter
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* case you have to open it again very soon.
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*/
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static int wdtpci_release(struct inode *inode, struct file *file)
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{
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if (expect_close == 42) {
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wdtpci_stop();
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} else {
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pr_crit("Unexpected close, not stopping timer!\n");
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wdtpci_ping();
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}
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expect_close = 0;
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clear_bit(0, &open_lock);
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return 0;
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}
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/**
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* wdtpci_temp_read:
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* @file: file handle to the watchdog board
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* @buf: buffer to write 1 byte into
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* @count: length of buffer
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* @ptr: offset (no seek allowed)
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*
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* Read reports the temperature in degrees Fahrenheit. The API is in
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* fahrenheit. It was designed by an imperial measurement luddite.
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*/
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static ssize_t wdtpci_temp_read(struct file *file, char __user *buf,
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size_t count, loff_t *ptr)
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{
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int temperature;
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if (wdtpci_get_temperature(&temperature))
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return -EFAULT;
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if (copy_to_user(buf, &temperature, 1))
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return -EFAULT;
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return 1;
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}
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/**
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* wdtpci_temp_open:
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* @inode: inode of device
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* @file: file handle to device
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*
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* The temperature device has been opened.
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*/
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static int wdtpci_temp_open(struct inode *inode, struct file *file)
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{
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return stream_open(inode, file);
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}
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/**
|
|
* wdtpci_temp_release:
|
|
* @inode: inode to board
|
|
* @file: file handle to board
|
|
*
|
|
* The temperature device has been closed.
|
|
*/
|
|
|
|
static int wdtpci_temp_release(struct inode *inode, struct file *file)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* notify_sys:
|
|
* @this: our notifier block
|
|
* @code: the event being reported
|
|
* @unused: unused
|
|
*
|
|
* Our notifier is called on system shutdowns. We want to turn the card
|
|
* off at reboot otherwise the machine will reboot again during memory
|
|
* test or worse yet during the following fsck. This would suck, in fact
|
|
* trust me - if it happens it does suck.
|
|
*/
|
|
|
|
static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code,
|
|
void *unused)
|
|
{
|
|
if (code == SYS_DOWN || code == SYS_HALT)
|
|
wdtpci_stop();
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
/*
|
|
* Kernel Interfaces
|
|
*/
|
|
|
|
|
|
static const struct file_operations wdtpci_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.write = wdtpci_write,
|
|
.unlocked_ioctl = wdtpci_ioctl,
|
|
.open = wdtpci_open,
|
|
.release = wdtpci_release,
|
|
};
|
|
|
|
static struct miscdevice wdtpci_miscdev = {
|
|
.minor = WATCHDOG_MINOR,
|
|
.name = "watchdog",
|
|
.fops = &wdtpci_fops,
|
|
};
|
|
|
|
static const struct file_operations wdtpci_temp_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.read = wdtpci_temp_read,
|
|
.open = wdtpci_temp_open,
|
|
.release = wdtpci_temp_release,
|
|
};
|
|
|
|
static struct miscdevice temp_miscdev = {
|
|
.minor = TEMP_MINOR,
|
|
.name = "temperature",
|
|
.fops = &wdtpci_temp_fops,
|
|
};
|
|
|
|
/*
|
|
* The WDT card needs to learn about soft shutdowns in order to
|
|
* turn the timebomb registers off.
|
|
*/
|
|
|
|
static struct notifier_block wdtpci_notifier = {
|
|
.notifier_call = wdtpci_notify_sys,
|
|
};
|
|
|
|
|
|
static int wdtpci_init_one(struct pci_dev *dev,
|
|
const struct pci_device_id *ent)
|
|
{
|
|
int ret = -EIO;
|
|
|
|
dev_count++;
|
|
if (dev_count > 1) {
|
|
pr_err("This driver only supports one device\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (type != 500 && type != 501) {
|
|
pr_err("unknown card type '%d'\n", type);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (pci_enable_device(dev)) {
|
|
pr_err("Not possible to enable PCI Device\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (pci_resource_start(dev, 2) == 0x0000) {
|
|
pr_err("No I/O-Address for card detected\n");
|
|
ret = -ENODEV;
|
|
goto out_pci;
|
|
}
|
|
|
|
if (pci_request_region(dev, 2, "wdt_pci")) {
|
|
pr_err("I/O address 0x%llx already in use\n",
|
|
(unsigned long long)pci_resource_start(dev, 2));
|
|
goto out_pci;
|
|
}
|
|
|
|
irq = dev->irq;
|
|
io = pci_resource_start(dev, 2);
|
|
|
|
if (request_irq(irq, wdtpci_interrupt, IRQF_SHARED,
|
|
"wdt_pci", &wdtpci_miscdev)) {
|
|
pr_err("IRQ %d is not free\n", irq);
|
|
goto out_reg;
|
|
}
|
|
|
|
pr_info("PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%llx (Interrupt %d)\n",
|
|
(unsigned long long)io, irq);
|
|
|
|
/* Check that the heartbeat value is within its range;
|
|
if not reset to the default */
|
|
if (wdtpci_set_heartbeat(heartbeat)) {
|
|
wdtpci_set_heartbeat(WD_TIMO);
|
|
pr_info("heartbeat value must be 0 < heartbeat < 65536, using %d\n",
|
|
WD_TIMO);
|
|
}
|
|
|
|
ret = register_reboot_notifier(&wdtpci_notifier);
|
|
if (ret) {
|
|
pr_err("cannot register reboot notifier (err=%d)\n", ret);
|
|
goto out_irq;
|
|
}
|
|
|
|
if (type == 501) {
|
|
ret = misc_register(&temp_miscdev);
|
|
if (ret) {
|
|
pr_err("cannot register miscdev on minor=%d (err=%d)\n",
|
|
TEMP_MINOR, ret);
|
|
goto out_rbt;
|
|
}
|
|
}
|
|
|
|
ret = misc_register(&wdtpci_miscdev);
|
|
if (ret) {
|
|
pr_err("cannot register miscdev on minor=%d (err=%d)\n",
|
|
WATCHDOG_MINOR, ret);
|
|
goto out_misc;
|
|
}
|
|
|
|
pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
|
|
heartbeat, nowayout);
|
|
if (type == 501)
|
|
pr_info("Fan Tachometer is %s\n",
|
|
tachometer ? "Enabled" : "Disabled");
|
|
|
|
ret = 0;
|
|
out:
|
|
return ret;
|
|
|
|
out_misc:
|
|
if (type == 501)
|
|
misc_deregister(&temp_miscdev);
|
|
out_rbt:
|
|
unregister_reboot_notifier(&wdtpci_notifier);
|
|
out_irq:
|
|
free_irq(irq, &wdtpci_miscdev);
|
|
out_reg:
|
|
pci_release_region(dev, 2);
|
|
out_pci:
|
|
pci_disable_device(dev);
|
|
goto out;
|
|
}
|
|
|
|
|
|
static void wdtpci_remove_one(struct pci_dev *pdev)
|
|
{
|
|
/* here we assume only one device will ever have
|
|
* been picked up and registered by probe function */
|
|
misc_deregister(&wdtpci_miscdev);
|
|
if (type == 501)
|
|
misc_deregister(&temp_miscdev);
|
|
unregister_reboot_notifier(&wdtpci_notifier);
|
|
free_irq(irq, &wdtpci_miscdev);
|
|
pci_release_region(pdev, 2);
|
|
pci_disable_device(pdev);
|
|
dev_count--;
|
|
}
|
|
|
|
|
|
static const struct pci_device_id wdtpci_pci_tbl[] = {
|
|
{
|
|
.vendor = PCI_VENDOR_ID_ACCESSIO,
|
|
.device = PCI_DEVICE_ID_ACCESSIO_WDG_CSM,
|
|
.subvendor = PCI_ANY_ID,
|
|
.subdevice = PCI_ANY_ID,
|
|
},
|
|
{ 0, }, /* terminate list */
|
|
};
|
|
MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl);
|
|
|
|
|
|
static struct pci_driver wdtpci_driver = {
|
|
.name = "wdt_pci",
|
|
.id_table = wdtpci_pci_tbl,
|
|
.probe = wdtpci_init_one,
|
|
.remove = wdtpci_remove_one,
|
|
};
|
|
|
|
module_pci_driver(wdtpci_driver);
|
|
|
|
MODULE_AUTHOR("JP Nollmann, Alan Cox");
|
|
MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards");
|
|
MODULE_LICENSE("GPL");
|