From b7e04f8c61a46d742de23af5d7ca2b41b33e40ac Mon Sep 17 00:00:00 2001 From: Wim Van Sebroeck Date: Fri, 17 Aug 2007 08:38:02 +0000 Subject: mv watchdog tree under drivers move watchdog tree from drivers/char/watchdog to drivers/watchdog. Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/wdt_pci.c | 756 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 756 insertions(+) create mode 100644 drivers/watchdog/wdt_pci.c (limited to 'drivers/watchdog/wdt_pci.c') diff --git a/drivers/watchdog/wdt_pci.c b/drivers/watchdog/wdt_pci.c new file mode 100644 index 00000000000..6baf4ae42c9 --- /dev/null +++ b/drivers/watchdog/wdt_pci.c @@ -0,0 +1,756 @@ +/* + * Industrial Computer Source PCI-WDT500/501 driver + * + * (c) Copyright 1996-1997 Alan Cox , All Rights Reserved. + * http://www.redhat.com + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide + * warranty for any of this software. This material is provided + * "AS-IS" and at no charge. + * + * (c) Copyright 1995 Alan Cox + * + * Release 0.10. + * + * Fixes + * Dave Gregorich : Modularisation and minor bugs + * Alan Cox : Added the watchdog ioctl() stuff + * Alan Cox : Fixed the reboot problem (as noted by + * Matt Crocker). + * Alan Cox : Added wdt= boot option + * Alan Cox : Cleaned up copy/user stuff + * Tim Hockin : Added insmod parameters, comment cleanup + * Parameterized timeout + * JP Nollmann : Added support for PCI wdt501p + * Alan Cox : Split ISA and PCI cards into two drivers + * Jeff Garzik : PCI cleanups + * Tigran Aivazian : Restructured wdtpci_init_one() to handle failures + * Joel Becker : Added WDIOC_GET/SETTIMEOUT + * Zwane Mwaikambo : Magic char closing, locking changes, cleanups + * Matt Domsch : nowayout module option + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#define WDT_IS_PCI +#include "wd501p.h" + +#define PFX "wdt_pci: " + +/* + * Until Access I/O gets their application for a PCI vendor ID approved, + * I don't think that it's appropriate to move these constants into the + * regular pci_ids.h file. -- JPN 2000/01/18 + */ + +#ifndef PCI_VENDOR_ID_ACCESSIO +#define PCI_VENDOR_ID_ACCESSIO 0x494f +#endif +#ifndef PCI_DEVICE_ID_WDG_CSM +#define PCI_DEVICE_ID_WDG_CSM 0x22c0 +#endif + +/* We can only use 1 card due to the /dev/watchdog restriction */ +static int dev_count; + +static struct semaphore open_sem; +static spinlock_t wdtpci_lock; +static char expect_close; + +static int io; +static int irq; + +/* Default timeout */ +#define WD_TIMO 60 /* Default heartbeat = 60 seconds */ + +static int heartbeat = WD_TIMO; +static int wd_heartbeat; +module_param(heartbeat, int, 0); +MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0>8, WDT_COUNT0+ctr); +} + +/** + * wdtpci_start: + * + * Start the watchdog driver. + */ + +static int wdtpci_start(void) +{ + unsigned long flags; + + spin_lock_irqsave(&wdtpci_lock, flags); + + /* + * "pet" the watchdog, as Access says. + * This resets the clock outputs. + */ + inb_p(WDT_DC); /* Disable watchdog */ + wdtpci_ctr_mode(2,0); /* Program CTR2 for Mode 0: Pulse on Terminal Count */ + outb_p(0, WDT_DC); /* Enable watchdog */ + + inb_p(WDT_DC); /* Disable watchdog */ + outb_p(0, WDT_CLOCK); /* 2.0833MHz clock */ + inb_p(WDT_BUZZER); /* disable */ + inb_p(WDT_OPTONOTRST); /* disable */ + inb_p(WDT_OPTORST); /* disable */ + inb_p(WDT_PROGOUT); /* disable */ + wdtpci_ctr_mode(0,3); /* Program CTR0 for Mode 3: Square Wave Generator */ + wdtpci_ctr_mode(1,2); /* Program CTR1 for Mode 2: Rate Generator */ + wdtpci_ctr_mode(2,1); /* Program CTR2 for Mode 1: Retriggerable One-Shot */ + wdtpci_ctr_load(0,20833); /* count at 100Hz */ + wdtpci_ctr_load(1,wd_heartbeat);/* Heartbeat */ + /* DO NOT LOAD CTR2 on PCI card! -- JPN */ + outb_p(0, WDT_DC); /* Enable watchdog */ + + spin_unlock_irqrestore(&wdtpci_lock, flags); + return 0; +} + +/** + * wdtpci_stop: + * + * Stop the watchdog driver. + */ + +static int wdtpci_stop (void) +{ + unsigned long flags; + + /* Turn the card off */ + spin_lock_irqsave(&wdtpci_lock, flags); + inb_p(WDT_DC); /* Disable watchdog */ + wdtpci_ctr_load(2,0); /* 0 length reset pulses now */ + spin_unlock_irqrestore(&wdtpci_lock, flags); + return 0; +} + +/** + * wdtpci_ping: + * + * Reload counter one with the watchdog heartbeat. We don't bother reloading + * the cascade counter. + */ + +static int wdtpci_ping(void) +{ + unsigned long flags; + + /* Write a watchdog value */ + spin_lock_irqsave(&wdtpci_lock, flags); + inb_p(WDT_DC); /* Disable watchdog */ + wdtpci_ctr_mode(1,2); /* Re-Program CTR1 for Mode 2: Rate Generator */ + wdtpci_ctr_load(1,wd_heartbeat);/* Heartbeat */ + outb_p(0, WDT_DC); /* Enable watchdog */ + spin_unlock_irqrestore(&wdtpci_lock, flags); + return 0; +} + +/** + * wdtpci_set_heartbeat: + * @t: the new heartbeat value that needs to be set. + * + * Set a new heartbeat value for the watchdog device. If the heartbeat value is + * incorrect we keep the old value and return -EINVAL. If successfull we + * return 0. + */ +static int wdtpci_set_heartbeat(int t) +{ + /* Arbitrary, can't find the card's limits */ + if ((t < 1) || (t > 65535)) + return -EINVAL; + + heartbeat = t; + wd_heartbeat = t * 100; + return 0; +} + +/** + * wdtpci_get_status: + * @status: the new status. + * + * Extract the status information from a WDT watchdog device. There are + * several board variants so we have to know which bits are valid. Some + * bits default to one and some to zero in order to be maximally painful. + * + * we then map the bits onto the status ioctl flags. + */ + +static int wdtpci_get_status(int *status) +{ + unsigned char new_status=inb_p(WDT_SR); + + *status=0; + if (new_status & WDC_SR_ISOI0) + *status |= WDIOF_EXTERN1; + if (new_status & WDC_SR_ISII1) + *status |= WDIOF_EXTERN2; +#ifdef CONFIG_WDT_501_PCI + if (!(new_status & WDC_SR_TGOOD)) + *status |= WDIOF_OVERHEAT; + if (!(new_status & WDC_SR_PSUOVER)) + *status |= WDIOF_POWEROVER; + if (!(new_status & WDC_SR_PSUUNDR)) + *status |= WDIOF_POWERUNDER; + if (tachometer) { + if (!(new_status & WDC_SR_FANGOOD)) + *status |= WDIOF_FANFAULT; + } +#endif /* CONFIG_WDT_501_PCI */ + return 0; +} + +#ifdef CONFIG_WDT_501_PCI +/** + * wdtpci_get_temperature: + * + * Reports the temperature in degrees Fahrenheit. The API is in + * farenheit. It was designed by an imperial measurement luddite. + */ + +static int wdtpci_get_temperature(int *temperature) +{ + unsigned short c=inb_p(WDT_RT); + + *temperature = (c * 11 / 15) + 7; + return 0; +} +#endif /* CONFIG_WDT_501_PCI */ + +/** + * wdtpci_interrupt: + * @irq: Interrupt number + * @dev_id: Unused as we don't allow multiple devices. + * + * Handle an interrupt from the board. These are raised when the status + * map changes in what the board considers an interesting way. That means + * a failure condition occurring. + */ + +static irqreturn_t wdtpci_interrupt(int irq, void *dev_id) +{ + /* + * Read the status register see what is up and + * then printk it. + */ + unsigned char status=inb_p(WDT_SR); + + printk(KERN_CRIT PFX "status %d\n", status); + +#ifdef CONFIG_WDT_501_PCI + if (!(status & WDC_SR_TGOOD)) + printk(KERN_CRIT PFX "Overheat alarm.(%d)\n",inb_p(WDT_RT)); + if (!(status & WDC_SR_PSUOVER)) + printk(KERN_CRIT PFX "PSU over voltage.\n"); + if (!(status & WDC_SR_PSUUNDR)) + printk(KERN_CRIT PFX "PSU under voltage.\n"); + if (tachometer) { + if (!(status & WDC_SR_FANGOOD)) + printk(KERN_CRIT PFX "Possible fan fault.\n"); + } +#endif /* CONFIG_WDT_501_PCI */ + if (!(status&WDC_SR_WCCR)) +#ifdef SOFTWARE_REBOOT +#ifdef ONLY_TESTING + printk(KERN_CRIT PFX "Would Reboot.\n"); +#else + printk(KERN_CRIT PFX "Initiating system reboot.\n"); + emergency_restart(NULL); +#endif +#else + printk(KERN_CRIT PFX "Reset in 5ms.\n"); +#endif + return IRQ_HANDLED; +} + + +/** + * wdtpci_write: + * @file: file handle to the watchdog + * @buf: buffer to write (unused as data does not matter here + * @count: count of bytes + * @ppos: pointer to the position to write. No seeks allowed + * + * A write to a watchdog device is defined as a keepalive signal. Any + * write of data will do, as we we don't define content meaning. + */ + +static ssize_t wdtpci_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) +{ + if (count) { + if (!nowayout) { + size_t i; + + expect_close = 0; + + for (i = 0; i != count; i++) { + char c; + if(get_user(c, buf+i)) + return -EFAULT; + if (c == 'V') + expect_close = 42; + } + } + wdtpci_ping(); + } + + return count; +} + +/** + * wdtpci_ioctl: + * @inode: inode of the device + * @file: file handle to the device + * @cmd: watchdog command + * @arg: argument pointer + * + * The watchdog API defines a common set of functions for all watchdogs + * according to their available features. We only actually usefully support + * querying capabilities and current status. + */ + +static int wdtpci_ioctl(struct inode *inode, struct file *file, unsigned int cmd, + unsigned long arg) +{ + int new_heartbeat; + int status; + void __user *argp = (void __user *)arg; + int __user *p = argp; + + static struct watchdog_info ident = { + .options = WDIOF_SETTIMEOUT| + WDIOF_MAGICCLOSE| + WDIOF_KEEPALIVEPING, + .firmware_version = 1, + .identity = "PCI-WDT500/501", + }; + + /* Add options according to the card we have */ + ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2); +#ifdef CONFIG_WDT_501_PCI + ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER); + if (tachometer) + ident.options |= WDIOF_FANFAULT; +#endif /* CONFIG_WDT_501_PCI */ + + switch(cmd) + { + default: + return -ENOTTY; + case WDIOC_GETSUPPORT: + return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0; + + case WDIOC_GETSTATUS: + wdtpci_get_status(&status); + return put_user(status, p); + case WDIOC_GETBOOTSTATUS: + return put_user(0, p); + case WDIOC_KEEPALIVE: + wdtpci_ping(); + return 0; + case WDIOC_SETTIMEOUT: + if (get_user(new_heartbeat, p)) + return -EFAULT; + + if (wdtpci_set_heartbeat(new_heartbeat)) + return -EINVAL; + + wdtpci_ping(); + /* Fall */ + case WDIOC_GETTIMEOUT: + return put_user(heartbeat, p); + } +} + +/** + * wdtpci_open: + * @inode: inode of device + * @file: file handle to device + * + * The watchdog device has been opened. The watchdog device is single + * open and on opening we load the counters. Counter zero is a 100Hz + * cascade, into counter 1 which downcounts to reboot. When the counter + * triggers counter 2 downcounts the length of the reset pulse which + * set set to be as long as possible. + */ + +static int wdtpci_open(struct inode *inode, struct file *file) +{ + if (down_trylock(&open_sem)) + return -EBUSY; + + if (nowayout) { + __module_get(THIS_MODULE); + } + /* + * Activate + */ + wdtpci_start(); + return nonseekable_open(inode, file); +} + +/** + * wdtpci_release: + * @inode: inode to board + * @file: file handle to board + * + * The watchdog has a configurable API. There is a religious dispute + * between people who want their watchdog to be able to shut down and + * those who want to be sure if the watchdog manager dies the machine + * reboots. In the former case we disable the counters, in the latter + * case you have to open it again very soon. + */ + +static int wdtpci_release(struct inode *inode, struct file *file) +{ + if (expect_close == 42) { + wdtpci_stop(); + } else { + printk(KERN_CRIT PFX "Unexpected close, not stopping timer!"); + wdtpci_ping(); + } + expect_close = 0; + up(&open_sem); + return 0; +} + +#ifdef CONFIG_WDT_501_PCI +/** + * wdtpci_temp_read: + * @file: file handle to the watchdog board + * @buf: buffer to write 1 byte into + * @count: length of buffer + * @ptr: offset (no seek allowed) + * + * Read reports the temperature in degrees Fahrenheit. The API is in + * fahrenheit. It was designed by an imperial measurement luddite. + */ + +static ssize_t wdtpci_temp_read(struct file *file, char __user *buf, size_t count, loff_t *ptr) +{ + int temperature; + + if (wdtpci_get_temperature(&temperature)) + return -EFAULT; + + if (copy_to_user (buf, &temperature, 1)) + return -EFAULT; + + return 1; +} + +/** + * wdtpci_temp_open: + * @inode: inode of device + * @file: file handle to device + * + * The temperature device has been opened. + */ + +static int wdtpci_temp_open(struct inode *inode, struct file *file) +{ + return nonseekable_open(inode, file); +} + +/** + * 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; +} +#endif /* CONFIG_WDT_501_PCI */ + +/** + * 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) { + /* Turn the card off */ + wdtpci_stop(); + } + return NOTIFY_DONE; +} + +/* + * Kernel Interfaces + */ + + +static const struct file_operations wdtpci_fops = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .write = wdtpci_write, + .ioctl = wdtpci_ioctl, + .open = wdtpci_open, + .release = wdtpci_release, +}; + +static struct miscdevice wdtpci_miscdev = { + .minor = WATCHDOG_MINOR, + .name = "watchdog", + .fops = &wdtpci_fops, +}; + +#ifdef CONFIG_WDT_501_PCI +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, +}; +#endif /* CONFIG_WDT_501_PCI */ + +/* + * 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 __devinit wdtpci_init_one (struct pci_dev *dev, + const struct pci_device_id *ent) +{ + int ret = -EIO; + + dev_count++; + if (dev_count > 1) { + printk (KERN_ERR PFX "this driver only supports 1 device\n"); + return -ENODEV; + } + + if (pci_enable_device (dev)) { + printk (KERN_ERR PFX "Not possible to enable PCI Device\n"); + return -ENODEV; + } + + if (pci_resource_start (dev, 2) == 0x0000) { + printk (KERN_ERR PFX "No I/O-Address for card detected\n"); + ret = -ENODEV; + goto out_pci; + } + + sema_init(&open_sem, 1); + spin_lock_init(&wdtpci_lock); + + irq = dev->irq; + io = pci_resource_start (dev, 2); + + if (request_region (io, 16, "wdt_pci") == NULL) { + printk (KERN_ERR PFX "I/O address 0x%04x already in use\n", io); + goto out_pci; + } + + if (request_irq (irq, wdtpci_interrupt, IRQF_DISABLED | IRQF_SHARED, + "wdt_pci", &wdtpci_miscdev)) { + printk (KERN_ERR PFX "IRQ %d is not free\n", irq); + goto out_reg; + } + + printk ("PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%04x (Interrupt %d)\n", + io, irq); + + /* Check that the heartbeat value is within it's range ; if not reset to the default */ + if (wdtpci_set_heartbeat(heartbeat)) { + wdtpci_set_heartbeat(WD_TIMO); + printk(KERN_INFO PFX "heartbeat value must be 0