/* * intel TCO Watchdog Driver * * (c) Copyright 2006-2010 Wim Van Sebroeck . * * 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 "1.06" #define PFX DRV_NAME ": " /* Includes */ #include /* For module specific items */ #include /* For new moduleparam's */ #include /* For standard types (like size_t) */ #include /* For the -ENODEV/... values */ #include /* For printk/panic/... */ #include /* For MODULE_ALIAS_MISCDEV (WATCHDOG_MINOR) */ #include /* For the watchdog specific items */ #include /* For __init/__exit/... */ #include /* For file operations */ #include /* For platform_driver framework */ #include /* For pci functions */ #include /* For io-port access */ #include /* For spin_lock/spin_unlock/... */ #include /* For copy_to_user/put_user/... */ #include /* 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) ")"); /* * 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; } /* 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 "); MODULE_DESCRIPTION("Intel TCO WatchDog Timer Driver"); MODULE_VERSION(DRV_VERSION); MODULE_LICENSE("GPL"); MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);