forked from luck/tmp_suning_uos_patched
Merge master.kernel.org:/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog
* master.kernel.org:/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog: [WATCHDOG] iTCO_wdt.c shutdown patch [WATCHDOG] iTCO_wdt.c - pci_dev_put fix [WATCHDOG] iTCO_wdt (Intel TCO Timer) driver [WATCHDOG] iTCO_wdt (Intel TCO Timer) driver
This commit is contained in:
Linus Torvalds
commit
2fee7b1845
|
|
@ -316,6 +316,27 @@ config I8XX_TCO
|
|||
To compile this driver as a module, choose M here: the
|
||||
module will be called i8xx_tco.
|
||||
|
||||
config ITCO_WDT
|
||||
tristate "Intel TCO Timer/Watchdog (EXPERIMENTAL)"
|
||||
depends on WATCHDOG && (X86 || IA64) && PCI && EXPERIMENTAL
|
||||
---help---
|
||||
Hardware driver for the intel TCO timer based watchdog devices.
|
||||
These drivers are included in the Intel 82801 I/O Controller
|
||||
Hub family 'from ICH0 up to ICH7) and in the Intel 6300ESB
|
||||
controller hub.
|
||||
|
||||
The TCO (Total Cost of Ownership) timer is a watchdog timer
|
||||
that will reboot the machine after its second expiration. The
|
||||
expiration time can be configured with the "heartbeat" parameter.
|
||||
|
||||
On some motherboards the driver may fail to reset the chipset's
|
||||
NO_REBOOT flag which prevents the watchdog from rebooting the
|
||||
machine. If this is the case you will get a kernel message like
|
||||
"failed to reset NO_REBOOT flag, reboot disabled by hardware".
|
||||
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called iTCO_wdt.
|
||||
|
||||
config SC1200_WDT
|
||||
tristate "National Semiconductor PC87307/PC97307 (ala SC1200) Watchdog"
|
||||
depends on WATCHDOG && X86
|
||||
|
|
|
|||
|
|
@ -47,6 +47,7 @@ obj-$(CONFIG_IBMASR) += ibmasr.o
|
|||
obj-$(CONFIG_WAFER_WDT) += wafer5823wdt.o
|
||||
obj-$(CONFIG_I6300ESB_WDT) += i6300esb.o
|
||||
obj-$(CONFIG_I8XX_TCO) += i8xx_tco.o
|
||||
obj-$(CONFIG_ITCO_WDT) += iTCO_wdt.o
|
||||
obj-$(CONFIG_SC1200_WDT) += sc1200wdt.o
|
||||
obj-$(CONFIG_SCx200_WDT) += scx200_wdt.o
|
||||
obj-$(CONFIG_60XX_WDT) += sbc60xxwdt.o
|
||||
|
|
|
|||
735
drivers/char/watchdog/iTCO_wdt.c
Normal file
735
drivers/char/watchdog/iTCO_wdt.c
Normal file
|
|
@ -0,0 +1,735 @@
|
|||
/*
|
||||
* intel TCO Watchdog Driver (Used in i82801 and i6300ESB chipsets)
|
||||
*
|
||||
* (c) Copyright 2006 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, 290745-020,
|
||||
* 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,
|
||||
* 82801GB (ICH7) : document number 307013-002, 307014-009,
|
||||
* 82801GR (ICH7R) : document number 307013-002, 307014-009,
|
||||
* 82801GDH (ICH7DH) : document number 307013-002, 307014-009,
|
||||
* 82801GBM (ICH7-M) : document number 307013-002, 307014-009,
|
||||
* 82801GHM (ICH7-M DH) : document number 307013-002, 307014-009,
|
||||
* 6300ESB (6300ESB) : document number 300641-003
|
||||
*/
|
||||
|
||||
/*
|
||||
* Includes, defines, variables, module parameters, ...
|
||||
*/
|
||||
|
||||
/* Module and version information */
|
||||
#define DRV_NAME "iTCO_wdt"
|
||||
#define DRV_VERSION "1.00"
|
||||
#define DRV_RELDATE "30-Jul-2006"
|
||||
#define PFX DRV_NAME ": "
|
||||
|
||||
/* Includes */
|
||||
#include <linux/config.h> /* For CONFIG_WATCHDOG_NOWAYOUT/... */
|
||||
#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 <asm/uaccess.h> /* For copy_to_user/put_user/... */
|
||||
#include <asm/io.h> /* For inb/outb/... */
|
||||
|
||||
/* 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_ICH7, /* ICH7 & ICH7R */
|
||||
TCO_ICH7M, /* ICH7-M */
|
||||
TCO_ICH7MDH, /* ICH7-M DH */
|
||||
};
|
||||
|
||||
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},
|
||||
{"ICH7 or ICH7R", 2},
|
||||
{"ICH7-M", 2},
|
||||
{"ICH7-M DH", 2},
|
||||
{NULL,0}
|
||||
};
|
||||
|
||||
/*
|
||||
* 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[] = {
|
||||
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AA_0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH },
|
||||
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AB_0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH0 },
|
||||
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH2 },
|
||||
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_10, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH2M },
|
||||
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH3 },
|
||||
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH3M },
|
||||
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH4 },
|
||||
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH4M },
|
||||
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801E_0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_CICH },
|
||||
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH5 },
|
||||
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_1, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_6300ESB },
|
||||
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH6 },
|
||||
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH6M },
|
||||
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_2, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH6W },
|
||||
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH7 },
|
||||
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_1, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH7M },
|
||||
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_31, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH7MDH },
|
||||
{ 0, }, /* End of list */
|
||||
};
|
||||
MODULE_DEVICE_TABLE (pci, iTCO_wdt_pci_tbl);
|
||||
|
||||
/* Address definitions for the TCO */
|
||||
#define TCOBASE iTCO_wdt_private.ACPIBASE + 0x60 /* TCO base address */
|
||||
#define SMI_EN iTCO_wdt_private.ACPIBASE + 0x30 /* SMI Control and Enable Register */
|
||||
|
||||
#define TCO_RLD TCOBASE + 0x00 /* TCO Timer Reload and Current 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 */
|
||||
unsigned int iTCO_version; /* TCO version/generation */
|
||||
unsigned long ACPIBASE; /* The cards ACPIBASE address (TCOBASE = ACPIBASE+0x60) */
|
||||
unsigned long __iomem *gcs; /* NO_REBOOT flag is Memory-Mapped GCS register bit 5 (TCO version 2) */
|
||||
spinlock_t io_lock; /* the lock for io operations */
|
||||
struct pci_dev *pdev; /* the PCI-device */
|
||||
} iTCO_wdt_private;
|
||||
|
||||
static struct platform_device *iTCO_wdt_platform_device; /* the watchdog 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=CONFIG_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);
|
||||
|
||||
/* disable chipset's NO_REBOOT bit */
|
||||
if (iTCO_wdt_unset_NO_REBOOT_bit()) {
|
||||
printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, reboot disabled by hardware\n");
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
/* 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);
|
||||
|
||||
/* 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);
|
||||
|
||||
/* 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;
|
||||
|
||||
/* 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;
|
||||
}
|
||||
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_keepalive();
|
||||
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 int iTCO_wdt_ioctl (struct inode *inode, struct file *file,
|
||||
unsigned int cmd, unsigned long arg)
|
||||
{
|
||||
int new_options, retval = -EINVAL;
|
||||
int new_heartbeat;
|
||||
int time_left;
|
||||
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_KEEPALIVE:
|
||||
iTCO_wdt_keepalive();
|
||||
return 0;
|
||||
|
||||
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_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:
|
||||
{
|
||||
if (iTCO_wdt_get_timeleft(&time_left))
|
||||
return -EINVAL;
|
||||
|
||||
return put_user(time_left, p);
|
||||
}
|
||||
|
||||
default:
|
||||
return -ENOIOCTLCMD;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Kernel Interfaces
|
||||
*/
|
||||
|
||||
static struct file_operations iTCO_wdt_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.llseek = no_llseek,
|
||||
.write = iTCO_wdt_write,
|
||||
.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 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 &= 0x00007f80;
|
||||
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);
|
||||
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()) {
|
||||
printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, reboot disabled by hardware\n");
|
||||
ret = -ENODEV; /* Cannot reset NO_REBOOT bit */
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* Set the NO_REBOOT bit to prevent later reboots, just for sure */
|
||||
iTCO_wdt_set_NO_REBOOT_bit();
|
||||
|
||||
/* Set the TCO_EN bit in 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;
|
||||
}
|
||||
val32 = inl(SMI_EN);
|
||||
val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */
|
||||
outl(val32, SMI_EN);
|
||||
release_region(SMI_EN, 4);
|
||||
|
||||
/* 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 out;
|
||||
}
|
||||
|
||||
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(0, TCO1_STS);
|
||||
outb(3, TCO2_STS);
|
||||
|
||||
/* 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);
|
||||
out:
|
||||
if (iTCO_wdt_private.iTCO_version == 2)
|
||||
iounmap(iTCO_wdt_private.gcs);
|
||||
pci_dev_put(iTCO_wdt_private.pdev);
|
||||
iTCO_wdt_private.ACPIBASE = 0;
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void 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);
|
||||
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 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 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 = 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 (%s)\n",
|
||||
DRV_VERSION, DRV_RELDATE);
|
||||
|
||||
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);
|
||||
Loading…
Reference in New Issue
Block a user