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linux/drivers/watchdog/iTCO_wdt.c
Wim Van Sebroeck deb9197b70 watchdog: iTCO_wdt.c - problems with newer hardware due to SMI clearing 
Redhat Bugzilla: Bug 727875 - TCO_EN bit is disabled by TCO driver
Jiri Slaby: 28d41f53f broke temperature sensors on a ICH10 chipset

The iTCO_wdt driver disables the SMI. This breaks good working of newer hardware.
The disabling of the SMI by the TCO logic dates back from the i810-tco driver
from Nils Faerber (around 28 July 2000). The reason for this was that some BIOSes
install handlers reset or disable the watchdog timer instead of resetting the system.
The trick to fix this was to disable the SMI (by clearing the SMI_TCO_EN bit of the
SMI_EN register) to prevent this from happening.

This however has strange effects on newer hardware. So we are in a situation that
a fix for broken old hardware affects newer hardware.

The correct solution is to make this fix an option (with the new module parameter:
turn_SMI_watchdog_clear_off) so that the default behaviour is the unfixed version.

the next patch will be to move this in the start and stop functions of the driver
and to add a new module parameter for the global_smi_en bit and to get rid of the
vendor_support code.

This fix can have an effect on old (typical ICH & ICH2 chipsets) motherboards that
have a broken BIOS implementation concerning TCO logic. In these case the module
parameter turn_SMI_watchdog_clear_off=1 will need to be added.

Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2011-11-05 21:22:06 +01:00

983 lines
28 KiB
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/*
* intel TCO Watchdog Driver
*
* (c) Copyright 2006-2011 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.)
* document number 290655-003, 290677-014: 82801AA (ICH), 82801AB (ICHO)
* document number 290687-002, 298242-027: 82801BA (ICH2)
* document number 290733-003, 290739-013: 82801CA (ICH3-S)
* document number 290716-001, 290718-007: 82801CAM (ICH3-M)
* document number 290744-001, 290745-025: 82801DB (ICH4)
* document number 252337-001, 252663-008: 82801DBM (ICH4-M)
* document number 273599-001, 273645-002: 82801E (C-ICH)
* document number 252516-001, 252517-028: 82801EB (ICH5), 82801ER (ICH5R)
* document number 300641-004, 300884-013: 6300ESB
* document number 301473-002, 301474-026: 82801F (ICH6)
* document number 313082-001, 313075-006: 631xESB, 632xESB
* document number 307013-003, 307014-024: 82801G (ICH7)
* document number 322896-001, 322897-001: NM10
* document number 313056-003, 313057-017: 82801H (ICH8)
* document number 316972-004, 316973-012: 82801I (ICH9)
* document number 319973-002, 319974-002: 82801J (ICH10)
* document number 322169-001, 322170-003: 5 Series, 3400 Series (PCH)
* document number 320066-003, 320257-008: EP80597 (IICH)
* document number 324645-001, 324646-001: Cougar Point (CPT)
* document number TBD : Patsburg (PBG)
* document number TBD : DH89xxCC
* document number TBD : Panther Point
*/
/*
* Includes, defines, variables, module parameters, ...
*/
/* Module and version information */
#define DRV_NAME "iTCO_wdt"
#define DRV_VERSION "1.07"
#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_NM10, /* NM10 */
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 */
TCO_PCH, /* PCH Desktop Full Featured */
TCO_PCHM, /* PCH Mobile Full Featured */
TCO_P55, /* P55 */
TCO_PM55, /* PM55 */
TCO_H55, /* H55 */
TCO_QM57, /* QM57 */
TCO_H57, /* H57 */
TCO_HM55, /* HM55 */
TCO_Q57, /* Q57 */
TCO_HM57, /* HM57 */
TCO_PCHMSFF, /* PCH Mobile SFF Full Featured */
TCO_QS57, /* QS57 */
TCO_3400, /* 3400 */
TCO_3420, /* 3420 */
TCO_3450, /* 3450 */
TCO_EP80579, /* EP80579 */
TCO_CPT, /* Cougar Point */
TCO_CPTD, /* Cougar Point Desktop */
TCO_CPTM, /* Cougar Point Mobile */
TCO_PBG, /* Patsburg */
TCO_DH89XXCC, /* DH89xxCC */
TCO_PPT, /* Panther Point */
};
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},
{"NM10", 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},
{"PCH Desktop Full Featured", 2},
{"PCH Mobile Full Featured", 2},
{"P55", 2},
{"PM55", 2},
{"H55", 2},
{"QM57", 2},
{"H57", 2},
{"HM55", 2},
{"Q57", 2},
{"HM57", 2},
{"PCH Mobile SFF Full Featured", 2},
{"QS57", 2},
{"3400", 2},
{"3420", 2},
{"3450", 2},
{"EP80579", 2},
{"Cougar Point", 2},
{"Cougar Point Desktop", 2},
{"Cougar Point Mobile", 2},
{"Patsburg", 2},
{"DH89xxCC", 2},
{"Panther Point", 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 DEFINE_PCI_DEVICE_TABLE(iTCO_wdt_pci_tbl) = {
{ PCI_VDEVICE(INTEL, 0x2410), TCO_ICH},
{ PCI_VDEVICE(INTEL, 0x2420), TCO_ICH0},
{ PCI_VDEVICE(INTEL, 0x2440), TCO_ICH2},
{ PCI_VDEVICE(INTEL, 0x244c), TCO_ICH2M},
{ PCI_VDEVICE(INTEL, 0x2480), TCO_ICH3},
{ PCI_VDEVICE(INTEL, 0x248c), TCO_ICH3M},
{ PCI_VDEVICE(INTEL, 0x24c0), TCO_ICH4},
{ PCI_VDEVICE(INTEL, 0x24cc), TCO_ICH4M},
{ PCI_VDEVICE(INTEL, 0x2450), TCO_CICH},
{ PCI_VDEVICE(INTEL, 0x24d0), TCO_ICH5},
{ PCI_VDEVICE(INTEL, 0x25a1), TCO_6300ESB},
{ PCI_VDEVICE(INTEL, 0x2640), TCO_ICH6},
{ PCI_VDEVICE(INTEL, 0x2641), TCO_ICH6M},
{ PCI_VDEVICE(INTEL, 0x2642), TCO_ICH6W},
{ PCI_VDEVICE(INTEL, 0x2670), TCO_631XESB},
{ PCI_VDEVICE(INTEL, 0x2671), TCO_631XESB},
{ PCI_VDEVICE(INTEL, 0x2672), TCO_631XESB},
{ PCI_VDEVICE(INTEL, 0x2673), TCO_631XESB},
{ PCI_VDEVICE(INTEL, 0x2674), TCO_631XESB},
{ PCI_VDEVICE(INTEL, 0x2675), TCO_631XESB},
{ PCI_VDEVICE(INTEL, 0x2676), TCO_631XESB},
{ PCI_VDEVICE(INTEL, 0x2677), TCO_631XESB},
{ PCI_VDEVICE(INTEL, 0x2678), TCO_631XESB},
{ PCI_VDEVICE(INTEL, 0x2679), TCO_631XESB},
{ PCI_VDEVICE(INTEL, 0x267a), TCO_631XESB},
{ PCI_VDEVICE(INTEL, 0x267b), TCO_631XESB},
{ PCI_VDEVICE(INTEL, 0x267c), TCO_631XESB},
{ PCI_VDEVICE(INTEL, 0x267d), TCO_631XESB},
{ PCI_VDEVICE(INTEL, 0x267e), TCO_631XESB},
{ PCI_VDEVICE(INTEL, 0x267f), TCO_631XESB},
{ PCI_VDEVICE(INTEL, 0x27b8), TCO_ICH7},
{ PCI_VDEVICE(INTEL, 0x27b0), TCO_ICH7DH},
{ PCI_VDEVICE(INTEL, 0x27b9), TCO_ICH7M},
{ PCI_VDEVICE(INTEL, 0x27bd), TCO_ICH7MDH},
{ PCI_VDEVICE(INTEL, 0x27bc), TCO_NM10},
{ PCI_VDEVICE(INTEL, 0x2810), TCO_ICH8},
{ PCI_VDEVICE(INTEL, 0x2812), TCO_ICH8DH},
{ PCI_VDEVICE(INTEL, 0x2814), TCO_ICH8DO},
{ PCI_VDEVICE(INTEL, 0x2815), TCO_ICH8M},
{ PCI_VDEVICE(INTEL, 0x2811), TCO_ICH8ME},
{ PCI_VDEVICE(INTEL, 0x2918), TCO_ICH9},
{ PCI_VDEVICE(INTEL, 0x2916), TCO_ICH9R},
{ PCI_VDEVICE(INTEL, 0x2912), TCO_ICH9DH},
{ PCI_VDEVICE(INTEL, 0x2914), TCO_ICH9DO},
{ PCI_VDEVICE(INTEL, 0x2919), TCO_ICH9M},
{ PCI_VDEVICE(INTEL, 0x2917), TCO_ICH9ME},
{ PCI_VDEVICE(INTEL, 0x3a18), TCO_ICH10},
{ PCI_VDEVICE(INTEL, 0x3a16), TCO_ICH10R},
{ PCI_VDEVICE(INTEL, 0x3a1a), TCO_ICH10D},
{ PCI_VDEVICE(INTEL, 0x3a14), TCO_ICH10DO},
{ PCI_VDEVICE(INTEL, 0x3b00), TCO_PCH},
{ PCI_VDEVICE(INTEL, 0x3b01), TCO_PCHM},
{ PCI_VDEVICE(INTEL, 0x3b02), TCO_P55},
{ PCI_VDEVICE(INTEL, 0x3b03), TCO_PM55},
{ PCI_VDEVICE(INTEL, 0x3b06), TCO_H55},
{ PCI_VDEVICE(INTEL, 0x3b07), TCO_QM57},
{ PCI_VDEVICE(INTEL, 0x3b08), TCO_H57},
{ PCI_VDEVICE(INTEL, 0x3b09), TCO_HM55},
{ PCI_VDEVICE(INTEL, 0x3b0a), TCO_Q57},
{ PCI_VDEVICE(INTEL, 0x3b0b), TCO_HM57},
{ PCI_VDEVICE(INTEL, 0x3b0d), TCO_PCHMSFF},
{ PCI_VDEVICE(INTEL, 0x3b0f), TCO_QS57},
{ PCI_VDEVICE(INTEL, 0x3b12), TCO_3400},
{ PCI_VDEVICE(INTEL, 0x3b14), TCO_3420},
{ PCI_VDEVICE(INTEL, 0x3b16), TCO_3450},
{ PCI_VDEVICE(INTEL, 0x5031), TCO_EP80579},
{ PCI_VDEVICE(INTEL, 0x1c41), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c42), TCO_CPTD},
{ PCI_VDEVICE(INTEL, 0x1c43), TCO_CPTM},
{ PCI_VDEVICE(INTEL, 0x1c44), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c45), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c46), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c47), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c48), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c49), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c4a), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c4b), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c4c), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c4d), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c4e), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c4f), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c50), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c51), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c52), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c53), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c54), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c55), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c56), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c57), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c58), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c59), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c5a), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c5b), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c5c), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c5d), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c5e), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1c5f), TCO_CPT},
{ PCI_VDEVICE(INTEL, 0x1d40), TCO_PBG},
{ PCI_VDEVICE(INTEL, 0x1d41), TCO_PBG},
{ PCI_VDEVICE(INTEL, 0x2310), TCO_DH89XXCC},
{ PCI_VDEVICE(INTEL, 0x1e40), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e41), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e42), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e43), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e44), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e45), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e46), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e47), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e48), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e49), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e4a), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e4b), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e4c), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e4d), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e4e), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e4f), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e50), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e51), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e52), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e53), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e54), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e55), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e56), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e57), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e58), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e59), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e5a), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e5b), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e5c), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e5d), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e5e), TCO_PPT},
{ PCI_VDEVICE(INTEL, 0x1e5f), TCO_PPT},
{ 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 device's 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 timeout in seconds. "
"5..76 (TCO v1) or 3..614 (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) ")");
static int turn_SMI_watchdog_clear_off = 0;
module_param(turn_SMI_watchdog_clear_off, int, 0);
MODULE_PARM_DESC(turn_SMI_watchdog_clear_off,
"Turn off SMI clearing watchdog (default=0)");
/*
* 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/BIOS\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) {
/* Reset the timeout status bit so that the timer
* needs to count down twice again before rebooting */
outw(0x0008, TCO1_STS); /* write 1 to clear bit */
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);
/* For TCO v1 the timer counts down twice before rebooting */
if (iTCO_wdt_private.iTCO_version == 1)
tmrval /= 2;
/* 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;
if (!(inw(TCO1_STS) & 0x0008))
val8 += (inb(TCOv1_TMR) & 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 const 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, "
"device disabled by hardware/BIOS\n");
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 hardware"
"/BIOS, device disabled\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_INFO PFX "unable to reset NO_REBOOT flag, "
"device disabled by hardware/BIOS\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, "
"device disabled\n", SMI_EN);
ret = -EIO;
goto out_unmap;
}
if (turn_SMI_watchdog_clear_off) {
/* 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 "
"device disabled\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 */
outw(0x0008, TCO1_STS); /* Clear the Time Out Status bit */
outw(0x0002, TCO2_STS); /* Clear SECOND_TO_STS bit */
outw(0x0004, 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
"timeout value out of range, 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:
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 ret = -ENODEV;
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) {
found++;
ret = iTCO_wdt_init(pdev, ent, dev);
if (!ret)
break;
}
}
if (!found)
printk(KERN_INFO PFX "No device detected.\n");
return ret;
}
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();
}
static struct platform_driver iTCO_wdt_driver = {
.probe = iTCO_wdt_probe,
.remove = __devexit_p(iTCO_wdt_remove),
.shutdown = iTCO_wdt_shutdown,
.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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