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linux/drivers/char/watchdog/i8xx_tco.c
Greg Kroah-Hartman 7586585897 [PATCH] PCI: clean up dynamic pci id logic 
The dynamic pci id logic has been bothering me for a while, and now that
I started to look into how to move some of this to the driver core, I
thought it was time to clean it all up.

It ends up making the code smaller, and easier to follow, and fixes a
few bugs at the same time (dynamic ids were not being matched
everywhere, and so could be missed on some call paths for new devices,
semaphore not needed to be grabbed when adding a new id and calling the
driver core, etc.)

I also renamed the function pci_match_device() to pci_match_id() as
that's what it really does.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-07-01 13:35:50 -07:00

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/*
* i8xx_tco 0.07: TCO timer driver for i8xx chipsets
*
* (c) Copyright 2000 kernel concepts <nils@kernelconcepts.de>, All Rights Reserved.
* http://www.kernelconcepts.de
*
* 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 kernel concepts nor Nils Faerber admit liability nor provide
* warranty for any of this software. This material is provided
* "AS-IS" and at no charge.
*
* (c) Copyright 2000 kernel concepts <nils@kernelconcepts.de>
* developed for
* Jentro AG, Haar/Munich (Germany)
*
* TCO timer driver for i8xx chipsets
* based on softdog.c by Alan Cox <alan@redhat.com>
*
* The TCO timer is implemented in the following I/O controller hubs:
* (See the intel documentation on http://developer.intel.com.)
* 82801AA (ICH) : document number 290655-003, 290677-014,
* 82801AB (ICHO) : document number 290655-003, 290677-014,
* 82801BA (ICH2) : document number 290687-002, 298242-027,
* 82801BAM (ICH2-M) : document number 290687-002, 298242-027,
* 82801CA (ICH3-S) : document number 290733-003, 290739-013,
* 82801CAM (ICH3-M) : document number 290716-001, 290718-007,
* 82801DB (ICH4) : document number 290744-001, 290745-020,
* 82801DBM (ICH4-M) : document number 252337-001, 252663-005,
* 82801E (C-ICH) : document number 273599-001, 273645-002,
* 82801EB (ICH5) : document number 252516-001, 252517-003,
* 82801ER (ICH5R) : document number 252516-001, 252517-003,
* 82801FB (ICH6) : document number 301473-002, 301474-007,
* 82801FR (ICH6R) : document number 301473-002, 301474-007,
* 82801FBM (ICH6-M) : document number 301473-002, 301474-007,
* 82801FW (ICH6W) : document number 301473-001, 301474-007,
* 82801FRW (ICH6RW) : document number 301473-001, 301474-007
*
* 20000710 Nils Faerber
* Initial Version 0.01
* 20000728 Nils Faerber
* 0.02 Fix for SMI_EN->TCO_EN bit, some cleanups
* 20011214 Matt Domsch <Matt_Domsch@dell.com>
* 0.03 Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
* Didn't add timeout option as i810_margin already exists.
* 20020224 Joel Becker, Wim Van Sebroeck
* 0.04 Support for 82801CA(M) chipset, timer margin needs to be > 3,
* add support for WDIOC_SETTIMEOUT and WDIOC_GETTIMEOUT.
* 20020412 Rob Radez <rob@osinvestor.com>, Wim Van Sebroeck
* 0.05 Fix possible timer_alive race, add expect close support,
* clean up ioctls (WDIOC_GETSTATUS, WDIOC_GETBOOTSTATUS and
* WDIOC_SETOPTIONS), made i810tco_getdevice __init,
* removed boot_status, removed tco_timer_read,
* added support for 82801DB and 82801E chipset,
* added support for 82801EB and 8280ER chipset,
* general cleanup.
* 20030921 Wim Van Sebroeck <wim@iguana.be>
* 0.06 change i810_margin to heartbeat, use module_param,
* added notify system support, renamed module to i8xx_tco.
* 20050128 Wim Van Sebroeck <wim@iguana.be>
* 0.07 Added support for the ICH4-M, ICH6, ICH6R, ICH6-M, ICH6W and ICH6RW
* chipsets. Also added support for the "undocumented" ICH7 chipset.
*/
/*
* Includes, defines, variables, module parameters, ...
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include "i8xx_tco.h"
/* Module and version information */
#define TCO_VERSION "0.07"
#define TCO_MODULE_NAME "i8xx TCO timer"
#define TCO_DRIVER_NAME TCO_MODULE_NAME ", v" TCO_VERSION
#define PFX TCO_MODULE_NAME ": "
/* internal variables */
static unsigned int ACPIBASE;
static spinlock_t tco_lock; /* Guards the hardware */
static unsigned long timer_alive;
static char tco_expect_close;
static struct pci_dev *i8xx_tco_pci;
/* module parameters */
#define WATCHDOG_HEARTBEAT 30 /* 30 sec default heartbeat (2<heartbeat<39) */
static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */
module_param(heartbeat, int, 0);
MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2<heartbeat<39, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
#ifdef CONFIG_WATCHDOG_NOWAYOUT
static int nowayout = 1;
#else
static int nowayout = 0;
#endif
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
/*
* Some TCO specific functions
*/
static inline unsigned char seconds_to_ticks(int seconds)
{
/* the internal timer is stored as ticks which decrement
* every 0.6 seconds */
return (seconds * 10) / 6;
}
static int tco_timer_start (void)
{
unsigned char val;
spin_lock(&tco_lock);
val = inb (TCO1_CNT + 1);
val &= 0xf7;
outb (val, TCO1_CNT + 1);
val = inb (TCO1_CNT + 1);
spin_unlock(&tco_lock);
if (val & 0x08)
return -1;
return 0;
}
static int tco_timer_stop (void)
{
unsigned char val;
spin_lock(&tco_lock);
val = inb (TCO1_CNT + 1);
val |= 0x08;
outb (val, TCO1_CNT + 1);
val = inb (TCO1_CNT + 1);
spin_unlock(&tco_lock);
if ((val & 0x08) == 0)
return -1;
return 0;
}
static int tco_timer_keepalive (void)
{
spin_lock(&tco_lock);
outb (0x01, TCO1_RLD);
spin_unlock(&tco_lock);
return 0;
}
static int tco_timer_set_heartbeat (int t)
{
unsigned char val;
unsigned char tmrval;
tmrval = seconds_to_ticks(t);
/* from the specs: */
/* "Values of 0h-3h are ignored and should not be attempted" */
if (tmrval > 0x3f || tmrval < 0x04)
return -EINVAL;
/* Write new heartbeat to watchdog */
spin_lock(&tco_lock);
val = inb (TCO1_TMR);
val &= 0xc0;
val |= tmrval;
outb (val, TCO1_TMR);
val = inb (TCO1_TMR);
spin_unlock(&tco_lock);
if ((val & 0x3f) != tmrval)
return -EINVAL;
heartbeat = t;
return 0;
}
/*
* /dev/watchdog handling
*/
static int i8xx_tco_open (struct inode *inode, struct file *file)
{
/* /dev/watchdog can only be opened once */
if (test_and_set_bit(0, &timer_alive))
return -EBUSY;
/*
* Reload and activate timer
*/
tco_timer_keepalive ();
tco_timer_start ();
return nonseekable_open(inode, file);
}
static int i8xx_tco_release (struct inode *inode, struct file *file)
{
/*
* Shut off the timer.
*/
if (tco_expect_close == 42) {
tco_timer_stop ();
} else {
printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
tco_timer_keepalive ();
}
clear_bit(0, &timer_alive);
tco_expect_close = 0;
return 0;
}
static ssize_t i8xx_tco_write (struct file *file, const char __user *data,
size_t len, loff_t * ppos)
{
/* See if we got the magic character 'V' and reload the timer */
if (len) {
if (!nowayout) {
size_t i;
/* note: just in case someone wrote the magic character
* five months ago... */
tco_expect_close = 0;
/* scan to see whether or not we got the magic character */
for (i = 0; i != len; i++) {
char c;
if(get_user(c, data+i))
return -EFAULT;
if (c == 'V')
tco_expect_close = 42;
}
}
/* someone wrote to us, we should reload the timer */
tco_timer_keepalive ();
}
return len;
}
static int i8xx_tco_ioctl (struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
int new_options, retval = -EINVAL;
int new_heartbeat;
void __user *argp = (void __user *)arg;
int __user *p = argp;
static struct watchdog_info ident = {
.options = WDIOF_SETTIMEOUT |
WDIOF_KEEPALIVEPING |
WDIOF_MAGICCLOSE,
.firmware_version = 0,
.identity = TCO_MODULE_NAME,
};
switch (cmd) {
case WDIOC_GETSUPPORT:
return copy_to_user(argp, &ident,
sizeof (ident)) ? -EFAULT : 0;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user (0, p);
case WDIOC_KEEPALIVE:
tco_timer_keepalive ();
return 0;
case WDIOC_SETOPTIONS:
{
if (get_user (new_options, p))
return -EFAULT;
if (new_options & WDIOS_DISABLECARD) {
tco_timer_stop ();
retval = 0;
}
if (new_options & WDIOS_ENABLECARD) {
tco_timer_keepalive ();
tco_timer_start ();
retval = 0;
}
return retval;
}
case WDIOC_SETTIMEOUT:
{
if (get_user(new_heartbeat, p))
return -EFAULT;
if (tco_timer_set_heartbeat(new_heartbeat))
return -EINVAL;
tco_timer_keepalive ();
/* Fall */
}
case WDIOC_GETTIMEOUT:
return put_user(heartbeat, p);
default:
return -ENOIOCTLCMD;
}
}
/*
* Notify system
*/
static int i8xx_tco_notify_sys (struct notifier_block *this, unsigned long code, void *unused)
{
if (code==SYS_DOWN || code==SYS_HALT) {
/* Turn the WDT off */
tco_timer_stop ();
}
return NOTIFY_DONE;
}
/*
* Kernel Interfaces
*/
static struct file_operations i8xx_tco_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = i8xx_tco_write,
.ioctl = i8xx_tco_ioctl,
.open = i8xx_tco_open,
.release = i8xx_tco_release,
};
static struct miscdevice i8xx_tco_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
.fops = &i8xx_tco_fops,
};
static struct notifier_block i8xx_tco_notifier = {
.notifier_call = i8xx_tco_notify_sys,
};
/*
* Data for PCI driver interface
*
* This data only exists for exporting the supported
* PCI ids via MODULE_DEVICE_TABLE. We do not actually
* register a pci_driver, because someone else might one day
* want to register another driver on the same PCI id.
*/
static struct pci_device_id i8xx_tco_pci_tbl[] = {
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AA_0, PCI_ANY_ID, PCI_ANY_ID, },
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AB_0, PCI_ANY_ID, PCI_ANY_ID, },
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0, PCI_ANY_ID, PCI_ANY_ID, },
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_10, PCI_ANY_ID, PCI_ANY_ID, },
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0, PCI_ANY_ID, PCI_ANY_ID, },
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12, PCI_ANY_ID, PCI_ANY_ID, },
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0, PCI_ANY_ID, PCI_ANY_ID, },
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12, PCI_ANY_ID, PCI_ANY_ID, },
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801E_0, PCI_ANY_ID, PCI_ANY_ID, },
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0, PCI_ANY_ID, PCI_ANY_ID, },
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_0, PCI_ANY_ID, PCI_ANY_ID, },
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1, PCI_ANY_ID, PCI_ANY_ID, },
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_2, PCI_ANY_ID, PCI_ANY_ID, },
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_0, PCI_ANY_ID, PCI_ANY_ID, },
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_1, PCI_ANY_ID, PCI_ANY_ID, },
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_1, PCI_ANY_ID, PCI_ANY_ID, },
{ 0, }, /* End of list */
};
MODULE_DEVICE_TABLE (pci, i8xx_tco_pci_tbl);
/*
* Init & exit routines
*/
static unsigned char __init i8xx_tco_getdevice (void)
{
struct pci_dev *dev = NULL;
u8 val1, val2;
u16 badr;
/*
* Find the PCI device
*/
while ((dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
if (pci_match_id(i8xx_tco_pci_tbl, dev)) {
i8xx_tco_pci = dev;
break;
}
}
if (i8xx_tco_pci) {
/*
* Find the ACPI base I/O address which is the base
* for the TCO registers (TCOBASE=ACPIBASE + 0x60)
* ACPIBASE is bits [15:7] from 0x40-0x43
*/
pci_read_config_byte (i8xx_tco_pci, 0x40, &val1);
pci_read_config_byte (i8xx_tco_pci, 0x41, &val2);
badr = ((val2 << 1) | (val1 >> 7)) << 7;
ACPIBASE = badr;
/* Something's wrong here, ACPIBASE has to be set */
if (badr == 0x0001 || badr == 0x0000) {
printk (KERN_ERR PFX "failed to get TCOBASE address\n");
return 0;
}
/*
* Check chipset's NO_REBOOT bit
*/
pci_read_config_byte (i8xx_tco_pci, 0xd4, &val1);
if (val1 & 0x02) {
val1 &= 0xfd;
pci_write_config_byte (i8xx_tco_pci, 0xd4, val1);
pci_read_config_byte (i8xx_tco_pci, 0xd4, &val1);
if (val1 & 0x02) {
printk (KERN_ERR PFX "failed to reset NO_REBOOT flag, reboot disabled by hardware\n");
return 0; /* Cannot reset NO_REBOOT bit */
}
}
/* Set the TCO_EN bit in SMI_EN register */
if (!request_region (SMI_EN + 1, 1, "i8xx TCO")) {
printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
SMI_EN + 1);
return 0;
}
val1 = inb (SMI_EN + 1);
val1 &= 0xdf;
outb (val1, SMI_EN + 1);
release_region (SMI_EN + 1, 1);
return 1;
}
return 0;
}
static int __init watchdog_init (void)
{
int ret;
spin_lock_init(&tco_lock);
/* Check whether or not the hardware watchdog is there */
if (!i8xx_tco_getdevice () || i8xx_tco_pci == NULL)
return -ENODEV;
if (!request_region (TCOBASE, 0x10, "i8xx TCO")) {
printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
TCOBASE);
ret = -EIO;
goto out;
}
/* Clear out the (probably old) status */
outb (0, TCO1_STS);
outb (3, TCO2_STS);
/* Check that the heartbeat value is within it's range ; if not reset to the default */
if (tco_timer_set_heartbeat (heartbeat)) {
heartbeat = WATCHDOG_HEARTBEAT;
tco_timer_set_heartbeat (heartbeat);
printk(KERN_INFO PFX "heartbeat value must be 2<heartbeat<39, using %d\n",
heartbeat);
}
ret = register_reboot_notifier(&i8xx_tco_notifier);
if (ret != 0) {
printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
ret);
goto unreg_region;
}
ret = misc_register(&i8xx_tco_miscdev);
if (ret != 0) {
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, ret);
goto unreg_notifier;
}
tco_timer_stop ();
printk (KERN_INFO PFX "initialized (0x%04x). heartbeat=%d sec (nowayout=%d)\n",
TCOBASE, heartbeat, nowayout);
return 0;
unreg_notifier:
unregister_reboot_notifier(&i8xx_tco_notifier);
unreg_region:
release_region (TCOBASE, 0x10);
out:
return ret;
}
static void __exit watchdog_cleanup (void)
{
u8 val;
/* Stop the timer before we leave */
if (!nowayout)
tco_timer_stop ();
/* Set the NO_REBOOT bit to prevent later reboots, just for sure */
pci_read_config_byte (i8xx_tco_pci, 0xd4, &val);
val |= 0x02;
pci_write_config_byte (i8xx_tco_pci, 0xd4, val);
/* Deregister */
misc_deregister (&i8xx_tco_miscdev);
unregister_reboot_notifier(&i8xx_tco_notifier);
release_region (TCOBASE, 0x10);
}
module_init(watchdog_init);
module_exit(watchdog_cleanup);
MODULE_AUTHOR("Nils Faerber");
MODULE_DESCRIPTION("TCO timer driver for i8xx chipsets");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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