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linux-next/drivers/watchdog/iTCO_wdt.c
Denis V. Lunev de8cd9a306 [WATCHDOG] iTCO_wdt: fix memory corruption when RCBA is disabled by hardware 
According to 9.1.33 on p.343 of ICH8.pdf RCBA can be disabled by
hardware if bit 0 of RCBA register is not set.

Perform correct check for this to prevent memory corruption under
some virtual machines where this feature is disabled.

Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Vasily Averin <vvs@openvz.org>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2009-06-18 07:31:44 +00:00

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/*
* intel TCO Watchdog Driver (Used in i82801 and i63xxESB chipsets)
*
* (c) Copyright 2006-2009 Wim Van Sebroeck <wim@iguana.be>.
*
* 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 Wim Van Sebroeck nor Iguana vzw. admit liability nor
* provide warranty for any of this software. This material is
* provided "AS-IS" and at no charge.
*
* The TCO watchdog 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, 290745-025,
* 82801DBM (ICH4-M) : document number 252337-001, 252663-008,
* 82801E (C-ICH) : document number 273599-001, 273645-002,
* 82801EB (ICH5) : document number 252516-001, 252517-028,
* 82801ER (ICH5R) : document number 252516-001, 252517-028,
* 6300ESB (6300ESB) : document number 300641-004, 300884-013,
* 82801FB (ICH6) : document number 301473-002, 301474-026,
* 82801FR (ICH6R) : document number 301473-002, 301474-026,
* 82801FBM (ICH6-M) : document number 301473-002, 301474-026,
* 82801FW (ICH6W) : document number 301473-001, 301474-026,
* 82801FRW (ICH6RW) : document number 301473-001, 301474-026,
* 631xESB (631xESB) : document number 313082-001, 313075-006,
* 632xESB (632xESB) : document number 313082-001, 313075-006,
* 82801GB (ICH7) : document number 307013-003, 307014-024,
* 82801GR (ICH7R) : document number 307013-003, 307014-024,
* 82801GDH (ICH7DH) : document number 307013-003, 307014-024,
* 82801GBM (ICH7-M) : document number 307013-003, 307014-024,
* 82801GHM (ICH7-M DH) : document number 307013-003, 307014-024,
* 82801GU (ICH7-U) : document number 307013-003, 307014-024,
* 82801HB (ICH8) : document number 313056-003, 313057-017,
* 82801HR (ICH8R) : document number 313056-003, 313057-017,
* 82801HBM (ICH8M) : document number 313056-003, 313057-017,
* 82801HH (ICH8DH) : document number 313056-003, 313057-017,
* 82801HO (ICH8DO) : document number 313056-003, 313057-017,
* 82801HEM (ICH8M-E) : document number 313056-003, 313057-017,
* 82801IB (ICH9) : document number 316972-004, 316973-012,
* 82801IR (ICH9R) : document number 316972-004, 316973-012,
* 82801IH (ICH9DH) : document number 316972-004, 316973-012,
* 82801IO (ICH9DO) : document number 316972-004, 316973-012,
* 82801IBM (ICH9M) : document number 316972-004, 316973-012,
* 82801IEM (ICH9M-E) : document number 316972-004, 316973-012,
* 82801JIB (ICH10) : document number 319973-002, 319974-002,
* 82801JIR (ICH10R) : document number 319973-002, 319974-002,
* 82801JD (ICH10D) : document number 319973-002, 319974-002,
* 82801JDO (ICH10DO) : document number 319973-002, 319974-002
*/
/*
* Includes, defines, variables, module parameters, ...
*/
/* Module and version information */
#define DRV_NAME "iTCO_wdt"
#define DRV_VERSION "1.05"
#define PFX DRV_NAME ": "
/* Includes */
#include <linux/module.h> /* For module specific items */
#include <linux/moduleparam.h> /* For new moduleparam's */
#include <linux/types.h> /* For standard types (like size_t) */
#include <linux/errno.h> /* For the -ENODEV/... values */
#include <linux/kernel.h> /* For printk/panic/... */
#include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV
(WATCHDOG_MINOR) */
#include <linux/watchdog.h> /* For the watchdog specific items */
#include <linux/init.h> /* For __init/__exit/... */
#include <linux/fs.h> /* For file operations */
#include <linux/platform_device.h> /* For platform_driver framework */
#include <linux/pci.h> /* For pci functions */
#include <linux/ioport.h> /* For io-port access */
#include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
#include <linux/uaccess.h> /* For copy_to_user/put_user/... */
#include <linux/io.h> /* For inb/outb/... */
#include "iTCO_vendor.h"
/* TCO related info */
enum iTCO_chipsets {
TCO_ICH = 0, /* ICH */
TCO_ICH0, /* ICH0 */
TCO_ICH2, /* ICH2 */
TCO_ICH2M, /* ICH2-M */
TCO_ICH3, /* ICH3-S */
TCO_ICH3M, /* ICH3-M */
TCO_ICH4, /* ICH4 */
TCO_ICH4M, /* ICH4-M */
TCO_CICH, /* C-ICH */
TCO_ICH5, /* ICH5 & ICH5R */
TCO_6300ESB, /* 6300ESB */
TCO_ICH6, /* ICH6 & ICH6R */
TCO_ICH6M, /* ICH6-M */
TCO_ICH6W, /* ICH6W & ICH6RW */
TCO_631XESB, /* 631xESB/632xESB */
TCO_ICH7, /* ICH7 & ICH7R */
TCO_ICH7DH, /* ICH7DH */
TCO_ICH7M, /* ICH7-M & ICH7-U */
TCO_ICH7MDH, /* ICH7-M DH */
TCO_ICH8, /* ICH8 & ICH8R */
TCO_ICH8DH, /* ICH8DH */
TCO_ICH8DO, /* ICH8DO */
TCO_ICH8M, /* ICH8M */
TCO_ICH8ME, /* ICH8M-E */
TCO_ICH9, /* ICH9 */
TCO_ICH9R, /* ICH9R */
TCO_ICH9DH, /* ICH9DH */
TCO_ICH9DO, /* ICH9DO */
TCO_ICH9M, /* ICH9M */
TCO_ICH9ME, /* ICH9M-E */
TCO_ICH10, /* ICH10 */
TCO_ICH10R, /* ICH10R */
TCO_ICH10D, /* ICH10D */
TCO_ICH10DO, /* ICH10DO */
};
static struct {
char *name;
unsigned int iTCO_version;
} iTCO_chipset_info[] __devinitdata = {
{"ICH", 1},
{"ICH0", 1},
{"ICH2", 1},
{"ICH2-M", 1},
{"ICH3-S", 1},
{"ICH3-M", 1},
{"ICH4", 1},
{"ICH4-M", 1},
{"C-ICH", 1},
{"ICH5 or ICH5R", 1},
{"6300ESB", 1},
{"ICH6 or ICH6R", 2},
{"ICH6-M", 2},
{"ICH6W or ICH6RW", 2},
{"631xESB/632xESB", 2},
{"ICH7 or ICH7R", 2},
{"ICH7DH", 2},
{"ICH7-M or ICH7-U", 2},
{"ICH7-M DH", 2},
{"ICH8 or ICH8R", 2},
{"ICH8DH", 2},
{"ICH8DO", 2},
{"ICH8M", 2},
{"ICH8M-E", 2},
{"ICH9", 2},
{"ICH9R", 2},
{"ICH9DH", 2},
{"ICH9DO", 2},
{"ICH9M", 2},
{"ICH9M-E", 2},
{"ICH10", 2},
{"ICH10R", 2},
{"ICH10D", 2},
{"ICH10DO", 2},
{NULL, 0}
};
#define ITCO_PCI_DEVICE(dev, data) \
.vendor = PCI_VENDOR_ID_INTEL, \
.device = dev, \
.subvendor = PCI_ANY_ID, \
.subdevice = PCI_ANY_ID, \
.class = 0, \
.class_mask = 0, \
.driver_data = data
/*
* This data only exists for exporting the supported PCI ids
* via MODULE_DEVICE_TABLE. We do not actually register a
* pci_driver, because the I/O Controller Hub has also other
* functions that probably will be registered by other drivers.
*/
static struct pci_device_id iTCO_wdt_pci_tbl[] = {
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801AA_0, TCO_ICH)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801AB_0, TCO_ICH0)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801BA_0, TCO_ICH2)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801BA_10, TCO_ICH2M)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801CA_0, TCO_ICH3)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801CA_12, TCO_ICH3M)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801DB_0, TCO_ICH4)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801DB_12, TCO_ICH4M)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801E_0, TCO_CICH)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801EB_0, TCO_ICH5)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ESB_1, TCO_6300ESB)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_0, TCO_ICH6)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_1, TCO_ICH6M)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_2, TCO_ICH6W)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ESB2_0, TCO_631XESB)},
{ ITCO_PCI_DEVICE(0x2671, TCO_631XESB)},
{ ITCO_PCI_DEVICE(0x2672, TCO_631XESB)},
{ ITCO_PCI_DEVICE(0x2673, TCO_631XESB)},
{ ITCO_PCI_DEVICE(0x2674, TCO_631XESB)},
{ ITCO_PCI_DEVICE(0x2675, TCO_631XESB)},
{ ITCO_PCI_DEVICE(0x2676, TCO_631XESB)},
{ ITCO_PCI_DEVICE(0x2677, TCO_631XESB)},
{ ITCO_PCI_DEVICE(0x2678, TCO_631XESB)},
{ ITCO_PCI_DEVICE(0x2679, TCO_631XESB)},
{ ITCO_PCI_DEVICE(0x267a, TCO_631XESB)},
{ ITCO_PCI_DEVICE(0x267b, TCO_631XESB)},
{ ITCO_PCI_DEVICE(0x267c, TCO_631XESB)},
{ ITCO_PCI_DEVICE(0x267d, TCO_631XESB)},
{ ITCO_PCI_DEVICE(0x267e, TCO_631XESB)},
{ ITCO_PCI_DEVICE(0x267f, TCO_631XESB)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_0, TCO_ICH7)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_30, TCO_ICH7DH)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_1, TCO_ICH7M)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_31, TCO_ICH7MDH)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_0, TCO_ICH8)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_2, TCO_ICH8DH)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_3, TCO_ICH8DO)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_4, TCO_ICH8M)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_1, TCO_ICH8ME)},
{ ITCO_PCI_DEVICE(0x2918, TCO_ICH9)},
{ ITCO_PCI_DEVICE(0x2916, TCO_ICH9R)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH9_2, TCO_ICH9DH)},
{ ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH9_4, TCO_ICH9DO)},
{ ITCO_PCI_DEVICE(0x2919, TCO_ICH9M)},
{ ITCO_PCI_DEVICE(0x2917, TCO_ICH9ME)},
{ ITCO_PCI_DEVICE(0x3a18, TCO_ICH10)},
{ ITCO_PCI_DEVICE(0x3a16, TCO_ICH10R)},
{ ITCO_PCI_DEVICE(0x3a1a, TCO_ICH10D)},
{ ITCO_PCI_DEVICE(0x3a14, TCO_ICH10DO)},
{ 0, }, /* End of list */
};
MODULE_DEVICE_TABLE(pci, iTCO_wdt_pci_tbl);
/* Address definitions for the TCO */
/* TCO base address */
#define TCOBASE (iTCO_wdt_private.ACPIBASE + 0x60)
/* SMI Control and Enable Register */
#define SMI_EN (iTCO_wdt_private.ACPIBASE + 0x30)
#define TCO_RLD (TCOBASE + 0x00) /* TCO Timer Reload and Curr. Value */
#define TCOv1_TMR (TCOBASE + 0x01) /* TCOv1 Timer Initial Value */
#define TCO_DAT_IN (TCOBASE + 0x02) /* TCO Data In Register */
#define TCO_DAT_OUT (TCOBASE + 0x03) /* TCO Data Out Register */
#define TCO1_STS (TCOBASE + 0x04) /* TCO1 Status Register */
#define TCO2_STS (TCOBASE + 0x06) /* TCO2 Status Register */
#define TCO1_CNT (TCOBASE + 0x08) /* TCO1 Control Register */
#define TCO2_CNT (TCOBASE + 0x0a) /* TCO2 Control Register */
#define TCOv2_TMR (TCOBASE + 0x12) /* TCOv2 Timer Initial Value */
/* internal variables */
static unsigned long is_active;
static char expect_release;
static struct { /* this is private data for the iTCO_wdt device */
/* TCO version/generation */
unsigned int iTCO_version;
/* The cards ACPIBASE address (TCOBASE = ACPIBASE+0x60) */
unsigned long ACPIBASE;
/* NO_REBOOT flag is Memory-Mapped GCS register bit 5 (TCO version 2)*/
unsigned long __iomem *gcs;
/* the lock for io operations */
spinlock_t io_lock;
/* the PCI-device */
struct pci_dev *pdev;
} iTCO_wdt_private;
/* the watchdog platform device */
static struct platform_device *iTCO_wdt_platform_device;
/* module parameters */
#define WATCHDOG_HEARTBEAT 30 /* 30 sec default heartbeat */
static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */
module_param(heartbeat, int, 0);
MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
"(2<heartbeat<39 (TCO v1) or 613 (TCO v2), default="
__MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout,
"Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
/*
* Some TCO specific functions
*/
static inline unsigned int seconds_to_ticks(int seconds)
{
/* the internal timer is stored as ticks which decrement
* every 0.6 seconds */
return (seconds * 10) / 6;
}
static void iTCO_wdt_set_NO_REBOOT_bit(void)
{
u32 val32;
/* Set the NO_REBOOT bit: this disables reboots */
if (iTCO_wdt_private.iTCO_version == 2) {
val32 = readl(iTCO_wdt_private.gcs);
val32 |= 0x00000020;
writel(val32, iTCO_wdt_private.gcs);
} else if (iTCO_wdt_private.iTCO_version == 1) {
pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
val32 |= 0x00000002;
pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
}
}
static int iTCO_wdt_unset_NO_REBOOT_bit(void)
{
int ret = 0;
u32 val32;
/* Unset the NO_REBOOT bit: this enables reboots */
if (iTCO_wdt_private.iTCO_version == 2) {
val32 = readl(iTCO_wdt_private.gcs);
val32 &= 0xffffffdf;
writel(val32, iTCO_wdt_private.gcs);
val32 = readl(iTCO_wdt_private.gcs);
if (val32 & 0x00000020)
ret = -EIO;
} else if (iTCO_wdt_private.iTCO_version == 1) {
pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
val32 &= 0xfffffffd;
pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
if (val32 & 0x00000002)
ret = -EIO;
}
return ret; /* returns: 0 = OK, -EIO = Error */
}
static int iTCO_wdt_start(void)
{
unsigned int val;
spin_lock(&iTCO_wdt_private.io_lock);
iTCO_vendor_pre_start(iTCO_wdt_private.ACPIBASE, heartbeat);
/* disable chipset's NO_REBOOT bit */
if (iTCO_wdt_unset_NO_REBOOT_bit()) {
spin_unlock(&iTCO_wdt_private.io_lock);
printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, "
"reboot disabled by hardware\n");
return -EIO;
}
/* Force the timer to its reload value by writing to the TCO_RLD
register */
if (iTCO_wdt_private.iTCO_version == 2)
outw(0x01, TCO_RLD);
else if (iTCO_wdt_private.iTCO_version == 1)
outb(0x01, TCO_RLD);
/* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled to count */
val = inw(TCO1_CNT);
val &= 0xf7ff;
outw(val, TCO1_CNT);
val = inw(TCO1_CNT);
spin_unlock(&iTCO_wdt_private.io_lock);
if (val & 0x0800)
return -1;
return 0;
}
static int iTCO_wdt_stop(void)
{
unsigned int val;
spin_lock(&iTCO_wdt_private.io_lock);
iTCO_vendor_pre_stop(iTCO_wdt_private.ACPIBASE);
/* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */
val = inw(TCO1_CNT);
val |= 0x0800;
outw(val, TCO1_CNT);
val = inw(TCO1_CNT);
/* Set the NO_REBOOT bit to prevent later reboots, just for sure */
iTCO_wdt_set_NO_REBOOT_bit();
spin_unlock(&iTCO_wdt_private.io_lock);
if ((val & 0x0800) == 0)
return -1;
return 0;
}
static int iTCO_wdt_keepalive(void)
{
spin_lock(&iTCO_wdt_private.io_lock);
iTCO_vendor_pre_keepalive(iTCO_wdt_private.ACPIBASE, heartbeat);
/* Reload the timer by writing to the TCO Timer Counter register */
if (iTCO_wdt_private.iTCO_version == 2)
outw(0x01, TCO_RLD);
else if (iTCO_wdt_private.iTCO_version == 1)
outb(0x01, TCO_RLD);
spin_unlock(&iTCO_wdt_private.io_lock);
return 0;
}
static int iTCO_wdt_set_heartbeat(int t)
{
unsigned int val16;
unsigned char val8;
unsigned int tmrval;
tmrval = seconds_to_ticks(t);
/* from the specs: */
/* "Values of 0h-3h are ignored and should not be attempted" */
if (tmrval < 0x04)
return -EINVAL;
if (((iTCO_wdt_private.iTCO_version == 2) && (tmrval > 0x3ff)) ||
((iTCO_wdt_private.iTCO_version == 1) && (tmrval > 0x03f)))
return -EINVAL;
iTCO_vendor_pre_set_heartbeat(tmrval);
/* Write new heartbeat to watchdog */
if (iTCO_wdt_private.iTCO_version == 2) {
spin_lock(&iTCO_wdt_private.io_lock);
val16 = inw(TCOv2_TMR);
val16 &= 0xfc00;
val16 |= tmrval;
outw(val16, TCOv2_TMR);
val16 = inw(TCOv2_TMR);
spin_unlock(&iTCO_wdt_private.io_lock);
if ((val16 & 0x3ff) != tmrval)
return -EINVAL;
} else if (iTCO_wdt_private.iTCO_version == 1) {
spin_lock(&iTCO_wdt_private.io_lock);
val8 = inb(TCOv1_TMR);
val8 &= 0xc0;
val8 |= (tmrval & 0xff);
outb(val8, TCOv1_TMR);
val8 = inb(TCOv1_TMR);
spin_unlock(&iTCO_wdt_private.io_lock);
if ((val8 & 0x3f) != tmrval)
return -EINVAL;
}
heartbeat = t;
return 0;
}
static int iTCO_wdt_get_timeleft(int *time_left)
{
unsigned int val16;
unsigned char val8;
/* read the TCO Timer */
if (iTCO_wdt_private.iTCO_version == 2) {
spin_lock(&iTCO_wdt_private.io_lock);
val16 = inw(TCO_RLD);
val16 &= 0x3ff;
spin_unlock(&iTCO_wdt_private.io_lock);
*time_left = (val16 * 6) / 10;
} else if (iTCO_wdt_private.iTCO_version == 1) {
spin_lock(&iTCO_wdt_private.io_lock);
val8 = inb(TCO_RLD);
val8 &= 0x3f;
spin_unlock(&iTCO_wdt_private.io_lock);
*time_left = (val8 * 6) / 10;
} else
return -EINVAL;
return 0;
}
/*
* /dev/watchdog handling
*/
static int iTCO_wdt_open(struct inode *inode, struct file *file)
{
/* /dev/watchdog can only be opened once */
if (test_and_set_bit(0, &is_active))
return -EBUSY;
/*
* Reload and activate timer
*/
iTCO_wdt_start();
return nonseekable_open(inode, file);
}
static int iTCO_wdt_release(struct inode *inode, struct file *file)
{
/*
* Shut off the timer.
*/
if (expect_release == 42) {
iTCO_wdt_stop();
} else {
printk(KERN_CRIT PFX
"Unexpected close, not stopping watchdog!\n");
iTCO_wdt_keepalive();
}
clear_bit(0, &is_active);
expect_release = 0;
return 0;
}
static ssize_t iTCO_wdt_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... */
expect_release = 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')
expect_release = 42;
}
}
/* someone wrote to us, we should reload the timer */
iTCO_wdt_keepalive();
}
return len;
}
static long iTCO_wdt_ioctl(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 = DRV_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_SETOPTIONS:
{
if (get_user(new_options, p))
return -EFAULT;
if (new_options & WDIOS_DISABLECARD) {
iTCO_wdt_stop();
retval = 0;
}
if (new_options & WDIOS_ENABLECARD) {
iTCO_wdt_keepalive();
iTCO_wdt_start();
retval = 0;
}
return retval;
}
case WDIOC_KEEPALIVE:
iTCO_wdt_keepalive();
return 0;
case WDIOC_SETTIMEOUT:
{
if (get_user(new_heartbeat, p))
return -EFAULT;
if (iTCO_wdt_set_heartbeat(new_heartbeat))
return -EINVAL;
iTCO_wdt_keepalive();
/* Fall */
}
case WDIOC_GETTIMEOUT:
return put_user(heartbeat, p);
case WDIOC_GETTIMELEFT:
{
int time_left;
if (iTCO_wdt_get_timeleft(&time_left))
return -EINVAL;
return put_user(time_left, p);
}
default:
return -ENOTTY;
}
}
/*
* Kernel Interfaces
*/
static const struct file_operations iTCO_wdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = iTCO_wdt_write,
.unlocked_ioctl = iTCO_wdt_ioctl,
.open = iTCO_wdt_open,
.release = iTCO_wdt_release,
};
static struct miscdevice iTCO_wdt_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
.fops = &iTCO_wdt_fops,
};
/*
* Init & exit routines
*/
static int __devinit iTCO_wdt_init(struct pci_dev *pdev,
const struct pci_device_id *ent, struct platform_device *dev)
{
int ret;
u32 base_address;
unsigned long RCBA;
unsigned long val32;
/*
* Find the ACPI/PM 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_dword(pdev, 0x40, &base_address);
base_address &= 0x0000ff80;
if (base_address == 0x00000000) {
/* Something's wrong here, ACPIBASE has to be set */
printk(KERN_ERR PFX "failed to get TCOBASE address\n");
pci_dev_put(pdev);
return -ENODEV;
}
iTCO_wdt_private.iTCO_version =
iTCO_chipset_info[ent->driver_data].iTCO_version;
iTCO_wdt_private.ACPIBASE = base_address;
iTCO_wdt_private.pdev = pdev;
/* Get the Memory-Mapped GCS register, we need it for the
NO_REBOOT flag (TCO v2). To get access to it you have to
read RCBA from PCI Config space 0xf0 and use it as base.
GCS = RCBA + ICH6_GCS(0x3410). */
if (iTCO_wdt_private.iTCO_version == 2) {
pci_read_config_dword(pdev, 0xf0, &base_address);
if ((base_address & 1) == 0) {
printk(KERN_ERR PFX "RCBA is disabled by harddware\n");
ret = -ENODEV;
goto out;
}
RCBA = base_address & 0xffffc000;
iTCO_wdt_private.gcs = ioremap((RCBA + 0x3410), 4);
}
/* Check chipset's NO_REBOOT bit */
if (iTCO_wdt_unset_NO_REBOOT_bit() && iTCO_vendor_check_noreboot_on()) {
printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, "
"reboot disabled by hardware\n");
ret = -ENODEV; /* Cannot reset NO_REBOOT bit */
goto out_unmap;
}
/* Set the NO_REBOOT bit to prevent later reboots, just for sure */
iTCO_wdt_set_NO_REBOOT_bit();
/* The TCO logic uses the TCO_EN bit in the SMI_EN register */
if (!request_region(SMI_EN, 4, "iTCO_wdt")) {
printk(KERN_ERR PFX
"I/O address 0x%04lx already in use\n", SMI_EN);
ret = -EIO;
goto out_unmap;
}
/* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI# */
val32 = inl(SMI_EN);
val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */
outl(val32, SMI_EN);
/* The TCO I/O registers reside in a 32-byte range pointed to
by the TCOBASE value */
if (!request_region(TCOBASE, 0x20, "iTCO_wdt")) {
printk(KERN_ERR PFX "I/O address 0x%04lx already in use\n",
TCOBASE);
ret = -EIO;
goto unreg_smi_en;
}
printk(KERN_INFO PFX
"Found a %s TCO device (Version=%d, TCOBASE=0x%04lx)\n",
iTCO_chipset_info[ent->driver_data].name,
iTCO_chipset_info[ent->driver_data].iTCO_version,
TCOBASE);
/* Clear out the (probably old) status */
outb(8, TCO1_STS); /* Clear the Time Out Status bit */
outb(2, TCO2_STS); /* Clear SECOND_TO_STS bit */
outb(4, TCO2_STS); /* Clear BOOT_STS bit */
/* Make sure the watchdog is not running */
iTCO_wdt_stop();
/* Check that the heartbeat value is within it's range;
if not reset to the default */
if (iTCO_wdt_set_heartbeat(heartbeat)) {
iTCO_wdt_set_heartbeat(WATCHDOG_HEARTBEAT);
printk(KERN_INFO PFX
"heartbeat value must be 2 < heartbeat < 39 (TCO v1) "
"or 613 (TCO v2), using %d\n", heartbeat);
}
ret = misc_register(&iTCO_wdt_miscdev);
if (ret != 0) {
printk(KERN_ERR PFX
"cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, ret);
goto unreg_region;
}
printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
heartbeat, nowayout);
return 0;
unreg_region:
release_region(TCOBASE, 0x20);
unreg_smi_en:
release_region(SMI_EN, 4);
out_unmap:
if (iTCO_wdt_private.iTCO_version == 2)
iounmap(iTCO_wdt_private.gcs);
out:
pci_dev_put(iTCO_wdt_private.pdev);
iTCO_wdt_private.ACPIBASE = 0;
return ret;
}
static void __devexit iTCO_wdt_cleanup(void)
{
/* Stop the timer before we leave */
if (!nowayout)
iTCO_wdt_stop();
/* Deregister */
misc_deregister(&iTCO_wdt_miscdev);
release_region(TCOBASE, 0x20);
release_region(SMI_EN, 4);
if (iTCO_wdt_private.iTCO_version == 2)
iounmap(iTCO_wdt_private.gcs);
pci_dev_put(iTCO_wdt_private.pdev);
iTCO_wdt_private.ACPIBASE = 0;
}
static int __devinit iTCO_wdt_probe(struct platform_device *dev)
{
int found = 0;
struct pci_dev *pdev = NULL;
const struct pci_device_id *ent;
spin_lock_init(&iTCO_wdt_private.io_lock);
for_each_pci_dev(pdev) {
ent = pci_match_id(iTCO_wdt_pci_tbl, pdev);
if (ent) {
if (!(iTCO_wdt_init(pdev, ent, dev))) {
found++;
break;
}
}
}
if (!found) {
printk(KERN_INFO PFX "No card detected\n");
return -ENODEV;
}
return 0;
}
static int __devexit iTCO_wdt_remove(struct platform_device *dev)
{
if (iTCO_wdt_private.ACPIBASE)
iTCO_wdt_cleanup();
return 0;
}
static void iTCO_wdt_shutdown(struct platform_device *dev)
{
iTCO_wdt_stop();
}
#define iTCO_wdt_suspend NULL
#define iTCO_wdt_resume NULL
static struct platform_driver iTCO_wdt_driver = {
.probe = iTCO_wdt_probe,
.remove = __devexit_p(iTCO_wdt_remove),
.shutdown = iTCO_wdt_shutdown,
.suspend = iTCO_wdt_suspend,
.resume = iTCO_wdt_resume,
.driver = {
.owner = THIS_MODULE,
.name = DRV_NAME,
},
};
static int __init iTCO_wdt_init_module(void)
{
int err;
printk(KERN_INFO PFX "Intel TCO WatchDog Timer Driver v%s\n",
DRV_VERSION);
err = platform_driver_register(&iTCO_wdt_driver);
if (err)
return err;
iTCO_wdt_platform_device = platform_device_register_simple(DRV_NAME,
-1, NULL, 0);
if (IS_ERR(iTCO_wdt_platform_device)) {
err = PTR_ERR(iTCO_wdt_platform_device);
goto unreg_platform_driver;
}
return 0;
unreg_platform_driver:
platform_driver_unregister(&iTCO_wdt_driver);
return err;
}
static void __exit iTCO_wdt_cleanup_module(void)
{
platform_device_unregister(iTCO_wdt_platform_device);
platform_driver_unregister(&iTCO_wdt_driver);
printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
}
module_init(iTCO_wdt_init_module);
module_exit(iTCO_wdt_cleanup_module);
MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
MODULE_DESCRIPTION("Intel TCO WatchDog Timer Driver");
MODULE_VERSION(DRV_VERSION);
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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