/* * intel TCO Watchdog Driver * * (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.) * 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 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 TBD : Cougar Point (CPT) */ /* * Includes, defines, variables, module parameters, ... */ /* Module and version information */ #define DRV_NAME "iTCO_wdt" #define DRV_VERSION "1.06" #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 */ 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_CPT1, /* Cougar Point */ TCO_CPT2, /* Cougar Point Desktop */ TCO_CPT3, /* Cougar Point Mobile */ TCO_CPT4, /* Cougar Point */ TCO_CPT5, /* Cougar Point */ TCO_CPT6, /* Cougar Point */ TCO_CPT7, /* Cougar Point */ TCO_CPT8, /* Cougar Point */ TCO_CPT9, /* Cougar Point */ TCO_CPT10, /* Cougar Point */ TCO_CPT11, /* Cougar Point */ TCO_CPT12, /* Cougar Point */ TCO_CPT13, /* Cougar Point */ TCO_CPT14, /* Cougar Point */ TCO_CPT15, /* Cougar Point */ TCO_CPT16, /* Cougar Point */ TCO_CPT17, /* Cougar Point */ TCO_CPT18, /* Cougar Point */ TCO_CPT19, /* Cougar Point */ TCO_CPT20, /* Cougar Point */ TCO_CPT21, /* Cougar Point */ TCO_CPT22, /* Cougar Point */ TCO_CPT23, /* Cougar Point */ TCO_CPT24, /* Cougar Point */ TCO_CPT25, /* Cougar Point */ TCO_CPT26, /* Cougar Point */ TCO_CPT27, /* Cougar Point */ TCO_CPT28, /* Cougar Point */ TCO_CPT29, /* Cougar Point */ TCO_CPT30, /* Cougar Point */ TCO_CPT31, /* Cougar 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}, {"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", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 2}, {"Cougar Point", 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)}, { ITCO_PCI_DEVICE(0x3b00, TCO_PCH)}, { ITCO_PCI_DEVICE(0x3b01, TCO_PCHM)}, { ITCO_PCI_DEVICE(0x3b02, TCO_P55)}, { ITCO_PCI_DEVICE(0x3b03, TCO_PM55)}, { ITCO_PCI_DEVICE(0x3b06, TCO_H55)}, { ITCO_PCI_DEVICE(0x3b07, TCO_QM57)}, { ITCO_PCI_DEVICE(0x3b08, TCO_H57)}, { ITCO_PCI_DEVICE(0x3b09, TCO_HM55)}, { ITCO_PCI_DEVICE(0x3b0a, TCO_Q57)}, { ITCO_PCI_DEVICE(0x3b0b, TCO_HM57)}, { ITCO_PCI_DEVICE(0x3b0d, TCO_PCHMSFF)}, { ITCO_PCI_DEVICE(0x3b0f, TCO_QS57)}, { ITCO_PCI_DEVICE(0x3b12, TCO_3400)}, { ITCO_PCI_DEVICE(0x3b14, TCO_3420)}, { ITCO_PCI_DEVICE(0x3b16, TCO_3450)}, { ITCO_PCI_DEVICE(0x5031, TCO_EP80579)}, { ITCO_PCI_DEVICE(0x1c41, TCO_CPT1)}, { ITCO_PCI_DEVICE(0x1c42, TCO_CPT2)}, { ITCO_PCI_DEVICE(0x1c43, TCO_CPT3)}, { ITCO_PCI_DEVICE(0x1c44, TCO_CPT4)}, { ITCO_PCI_DEVICE(0x1c45, TCO_CPT5)}, { ITCO_PCI_DEVICE(0x1c46, TCO_CPT6)}, { ITCO_PCI_DEVICE(0x1c47, TCO_CPT7)}, { ITCO_PCI_DEVICE(0x1c48, TCO_CPT8)}, { ITCO_PCI_DEVICE(0x1c49, TCO_CPT9)}, { ITCO_PCI_DEVICE(0x1c4a, TCO_CPT10)}, { ITCO_PCI_DEVICE(0x1c4b, TCO_CPT11)}, { ITCO_PCI_DEVICE(0x1c4c, TCO_CPT12)}, { ITCO_PCI_DEVICE(0x1c4d, TCO_CPT13)}, { ITCO_PCI_DEVICE(0x1c4e, TCO_CPT14)}, { ITCO_PCI_DEVICE(0x1c4f, TCO_CPT15)}, { ITCO_PCI_DEVICE(0x1c50, TCO_CPT16)}, { ITCO_PCI_DEVICE(0x1c51, TCO_CPT17)}, { ITCO_PCI_DEVICE(0x1c52, TCO_CPT18)}, { ITCO_PCI_DEVICE(0x1c53, TCO_CPT19)}, { ITCO_PCI_DEVICE(0x1c54, TCO_CPT20)}, { ITCO_PCI_DEVICE(0x1c55, TCO_CPT21)}, { ITCO_PCI_DEVICE(0x1c56, TCO_CPT22)}, { ITCO_PCI_DEVICE(0x1c57, TCO_CPT23)}, { ITCO_PCI_DEVICE(0x1c58, TCO_CPT24)}, { ITCO_PCI_DEVICE(0x1c59, TCO_CPT25)}, { ITCO_PCI_DEVICE(0x1c5a, TCO_CPT26)}, { ITCO_PCI_DEVICE(0x1c5b, TCO_CPT27)}, { ITCO_PCI_DEVICE(0x1c5c, TCO_CPT28)}, { ITCO_PCI_DEVICE(0x1c5d, TCO_CPT29)}, { ITCO_PCI_DEVICE(0x1c5e, TCO_CPT30)}, { ITCO_PCI_DEVICE(0x1c5f, TCO_CPT31)}, { 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 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) ")"); /* * 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) { /* 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\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 hardware\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, " "platform may have disabled it\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 */ 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: 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 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 card 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(); } #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);