/* * 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 * document number TBD : Lynx Point * document number TBD : Lynx Point-LP */ /* * Includes, defines, variables, module parameters, ... */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt /* Module and version information */ #define DRV_NAME "iTCO_wdt" #define DRV_VERSION "1.11" /* Includes */ #include <linux/acpi.h> /* For ACPI support */ #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/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 <linux/platform_data/itco_wdt.h> #include "iTCO_vendor.h" /* Address definitions for the TCO */ /* TCO base address */ #define TCOBASE (iTCO_wdt_private.tco_res->start) /* SMI Control and Enable Register */ #define SMI_EN (iTCO_wdt_private.smi_res->start) #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 struct { /* this is private data for the iTCO_wdt device */ /* TCO version/generation */ unsigned int iTCO_version; struct resource *tco_res; struct resource *smi_res; /* * NO_REBOOT flag is Memory-Mapped GCS register bit 5 (TCO version 2), * or memory-mapped PMC register bit 4 (TCO version 3). */ struct resource *gcs_pmc_res; unsigned long __iomem *gcs_pmc; /* the lock for io operations */ spinlock_t io_lock; struct platform_device *dev; /* the PCI-device */ struct pci_dev *pdev; /* whether or not the watchdog has been suspended */ bool suspended; } iTCO_wdt_private; /* module parameters */ #define WATCHDOG_TIMEOUT 30 /* 30 sec default heartbeat */ static int heartbeat = WATCHDOG_TIMEOUT; /* 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_TIMEOUT) ")"); static bool nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); static int turn_SMI_watchdog_clear_off = 1; module_param(turn_SMI_watchdog_clear_off, int, 0); MODULE_PARM_DESC(turn_SMI_watchdog_clear_off, "Turn off SMI clearing watchdog (depends on TCO-version)(default=1)"); /* * Some TCO specific functions */ /* * The iTCO v1 and v2's internal timer is stored as ticks which decrement * every 0.6 seconds. v3's internal timer is stored as seconds (some * datasheets incorrectly state 0.6 seconds). */ static inline unsigned int seconds_to_ticks(int secs) { return iTCO_wdt_private.iTCO_version == 3 ? secs : (secs * 10) / 6; } static inline unsigned int ticks_to_seconds(int ticks) { return iTCO_wdt_private.iTCO_version == 3 ? ticks : (ticks * 6) / 10; } static inline u32 no_reboot_bit(void) { u32 enable_bit; switch (iTCO_wdt_private.iTCO_version) { case 5: case 3: enable_bit = 0x00000010; break; case 2: enable_bit = 0x00000020; break; case 4: case 1: default: enable_bit = 0x00000002; break; } return enable_bit; } 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_pmc); val32 |= no_reboot_bit(); writel(val32, iTCO_wdt_private.gcs_pmc); } else if (iTCO_wdt_private.iTCO_version == 1) { pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32); val32 |= no_reboot_bit(); pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32); } } static int iTCO_wdt_unset_NO_REBOOT_bit(void) { u32 enable_bit = no_reboot_bit(); u32 val32 = 0; /* Unset the NO_REBOOT bit: this enables reboots */ if (iTCO_wdt_private.iTCO_version >= 2) { val32 = readl(iTCO_wdt_private.gcs_pmc); val32 &= ~enable_bit; writel(val32, iTCO_wdt_private.gcs_pmc); val32 = readl(iTCO_wdt_private.gcs_pmc); } else if (iTCO_wdt_private.iTCO_version == 1) { pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32); val32 &= ~enable_bit; pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32); pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32); } if (val32 & enable_bit) return -EIO; return 0; } static int iTCO_wdt_start(struct watchdog_device *wd_dev) { unsigned int val; spin_lock(&iTCO_wdt_private.io_lock); iTCO_vendor_pre_start(iTCO_wdt_private.smi_res, wd_dev->timeout); /* disable chipset's NO_REBOOT bit */ if (iTCO_wdt_unset_NO_REBOOT_bit()) { spin_unlock(&iTCO_wdt_private.io_lock); pr_err("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(struct watchdog_device *wd_dev) { unsigned int val; spin_lock(&iTCO_wdt_private.io_lock); iTCO_vendor_pre_stop(iTCO_wdt_private.smi_res); /* 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_ping(struct watchdog_device *wd_dev) { spin_lock(&iTCO_wdt_private.io_lock); iTCO_vendor_pre_keepalive(iTCO_wdt_private.smi_res, wd_dev->timeout); /* 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_timeout(struct watchdog_device *wd_dev, unsigned 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; } wd_dev->timeout = t; return 0; } static unsigned int iTCO_wdt_get_timeleft(struct watchdog_device *wd_dev) { unsigned int val16; unsigned char val8; unsigned int time_left = 0; /* 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 = ticks_to_seconds(val16); } 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 = ticks_to_seconds(val8); } return time_left; } /* * Kernel Interfaces */ static const struct watchdog_info ident = { .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, .firmware_version = 0, .identity = DRV_NAME, }; static const struct watchdog_ops iTCO_wdt_ops = { .owner = THIS_MODULE, .start = iTCO_wdt_start, .stop = iTCO_wdt_stop, .ping = iTCO_wdt_ping, .set_timeout = iTCO_wdt_set_timeout, .get_timeleft = iTCO_wdt_get_timeleft, }; static struct watchdog_device iTCO_wdt_watchdog_dev = { .info = &ident, .ops = &iTCO_wdt_ops, }; /* * Init & exit routines */ static void iTCO_wdt_cleanup(void) { /* Stop the timer before we leave */ if (!nowayout) iTCO_wdt_stop(&iTCO_wdt_watchdog_dev); /* Deregister */ watchdog_unregister_device(&iTCO_wdt_watchdog_dev); /* release resources */ release_region(iTCO_wdt_private.tco_res->start, resource_size(iTCO_wdt_private.tco_res)); release_region(iTCO_wdt_private.smi_res->start, resource_size(iTCO_wdt_private.smi_res)); if (iTCO_wdt_private.iTCO_version >= 2) { iounmap(iTCO_wdt_private.gcs_pmc); release_mem_region(iTCO_wdt_private.gcs_pmc_res->start, resource_size(iTCO_wdt_private.gcs_pmc_res)); } iTCO_wdt_private.tco_res = NULL; iTCO_wdt_private.smi_res = NULL; iTCO_wdt_private.gcs_pmc_res = NULL; iTCO_wdt_private.gcs_pmc = NULL; } static int iTCO_wdt_probe(struct platform_device *dev) { int ret = -ENODEV; unsigned long val32; struct itco_wdt_platform_data *pdata = dev_get_platdata(&dev->dev); if (!pdata) goto out; spin_lock_init(&iTCO_wdt_private.io_lock); iTCO_wdt_private.tco_res = platform_get_resource(dev, IORESOURCE_IO, ICH_RES_IO_TCO); if (!iTCO_wdt_private.tco_res) goto out; iTCO_wdt_private.smi_res = platform_get_resource(dev, IORESOURCE_IO, ICH_RES_IO_SMI); if (!iTCO_wdt_private.smi_res) goto out; iTCO_wdt_private.iTCO_version = pdata->version; iTCO_wdt_private.dev = dev; iTCO_wdt_private.pdev = to_pci_dev(dev->dev.parent); /* * Get the Memory-Mapped GCS or PMC register, we need it for the * NO_REBOOT flag (TCO v2 and v3). */ if (iTCO_wdt_private.iTCO_version >= 2) { iTCO_wdt_private.gcs_pmc_res = platform_get_resource(dev, IORESOURCE_MEM, ICH_RES_MEM_GCS_PMC); if (!iTCO_wdt_private.gcs_pmc_res) goto out; if (!request_mem_region(iTCO_wdt_private.gcs_pmc_res->start, resource_size(iTCO_wdt_private.gcs_pmc_res), dev->name)) { ret = -EBUSY; goto out; } iTCO_wdt_private.gcs_pmc = ioremap(iTCO_wdt_private.gcs_pmc_res->start, resource_size(iTCO_wdt_private.gcs_pmc_res)); if (!iTCO_wdt_private.gcs_pmc) { ret = -EIO; goto unreg_gcs_pmc; } } /* Check chipset's NO_REBOOT bit */ if (iTCO_wdt_unset_NO_REBOOT_bit() && iTCO_vendor_check_noreboot_on()) { pr_info("unable to reset NO_REBOOT flag, device disabled by hardware/BIOS\n"); ret = -ENODEV; /* Cannot reset NO_REBOOT bit */ goto unmap_gcs_pmc; } /* 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(iTCO_wdt_private.smi_res->start, resource_size(iTCO_wdt_private.smi_res), dev->name)) { pr_err("I/O address 0x%04llx already in use, device disabled\n", (u64)SMI_EN); ret = -EBUSY; goto unmap_gcs_pmc; } if (turn_SMI_watchdog_clear_off >= iTCO_wdt_private.iTCO_version) { /* * 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); } if (!request_region(iTCO_wdt_private.tco_res->start, resource_size(iTCO_wdt_private.tco_res), dev->name)) { pr_err("I/O address 0x%04llx already in use, device disabled\n", (u64)TCOBASE); ret = -EBUSY; goto unreg_smi; } pr_info("Found a %s TCO device (Version=%d, TCOBASE=0x%04llx)\n", pdata->name, pdata->version, (u64)TCOBASE); /* Clear out the (probably old) status */ switch (iTCO_wdt_private.iTCO_version) { case 5: case 4: outw(0x0008, TCO1_STS); /* Clear the Time Out Status bit */ outw(0x0002, TCO2_STS); /* Clear SECOND_TO_STS bit */ break; case 3: outl(0x20008, TCO1_STS); break; case 2: case 1: default: 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 */ break; } iTCO_wdt_watchdog_dev.bootstatus = 0; iTCO_wdt_watchdog_dev.timeout = WATCHDOG_TIMEOUT; watchdog_set_nowayout(&iTCO_wdt_watchdog_dev, nowayout); iTCO_wdt_watchdog_dev.parent = &dev->dev; /* Make sure the watchdog is not running */ iTCO_wdt_stop(&iTCO_wdt_watchdog_dev); /* Check that the heartbeat value is within it's range; if not reset to the default */ if (iTCO_wdt_set_timeout(&iTCO_wdt_watchdog_dev, heartbeat)) { iTCO_wdt_set_timeout(&iTCO_wdt_watchdog_dev, WATCHDOG_TIMEOUT); pr_info("timeout value out of range, using %d\n", WATCHDOG_TIMEOUT); } ret = watchdog_register_device(&iTCO_wdt_watchdog_dev); if (ret != 0) { pr_err("cannot register watchdog device (err=%d)\n", ret); goto unreg_tco; } pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n", heartbeat, nowayout); return 0; unreg_tco: release_region(iTCO_wdt_private.tco_res->start, resource_size(iTCO_wdt_private.tco_res)); unreg_smi: release_region(iTCO_wdt_private.smi_res->start, resource_size(iTCO_wdt_private.smi_res)); unmap_gcs_pmc: if (iTCO_wdt_private.iTCO_version >= 2) iounmap(iTCO_wdt_private.gcs_pmc); unreg_gcs_pmc: if (iTCO_wdt_private.iTCO_version >= 2) release_mem_region(iTCO_wdt_private.gcs_pmc_res->start, resource_size(iTCO_wdt_private.gcs_pmc_res)); out: iTCO_wdt_private.tco_res = NULL; iTCO_wdt_private.smi_res = NULL; iTCO_wdt_private.gcs_pmc_res = NULL; iTCO_wdt_private.gcs_pmc = NULL; return ret; } static int iTCO_wdt_remove(struct platform_device *dev) { if (iTCO_wdt_private.tco_res || iTCO_wdt_private.smi_res) iTCO_wdt_cleanup(); return 0; } static void iTCO_wdt_shutdown(struct platform_device *dev) { iTCO_wdt_stop(NULL); } #ifdef CONFIG_PM_SLEEP /* * Suspend-to-idle requires this, because it stops the ticks and timekeeping, so * the watchdog cannot be pinged while in that state. In ACPI sleep states the * watchdog is stopped by the platform firmware. */ #ifdef CONFIG_ACPI static inline bool need_suspend(void) { return acpi_target_system_state() == ACPI_STATE_S0; } #else static inline bool need_suspend(void) { return true; } #endif static int iTCO_wdt_suspend_noirq(struct device *dev) { int ret = 0; iTCO_wdt_private.suspended = false; if (watchdog_active(&iTCO_wdt_watchdog_dev) && need_suspend()) { ret = iTCO_wdt_stop(&iTCO_wdt_watchdog_dev); if (!ret) iTCO_wdt_private.suspended = true; } return ret; } static int iTCO_wdt_resume_noirq(struct device *dev) { if (iTCO_wdt_private.suspended) iTCO_wdt_start(&iTCO_wdt_watchdog_dev); return 0; } static struct dev_pm_ops iTCO_wdt_pm = { .suspend_noirq = iTCO_wdt_suspend_noirq, .resume_noirq = iTCO_wdt_resume_noirq, }; #define ITCO_WDT_PM_OPS (&iTCO_wdt_pm) #else #define ITCO_WDT_PM_OPS NULL #endif /* CONFIG_PM_SLEEP */ static struct platform_driver iTCO_wdt_driver = { .probe = iTCO_wdt_probe, .remove = iTCO_wdt_remove, .shutdown = iTCO_wdt_shutdown, .driver = { .name = DRV_NAME, .pm = ITCO_WDT_PM_OPS, }, }; static int __init iTCO_wdt_init_module(void) { int err; pr_info("Intel TCO WatchDog Timer Driver v%s\n", DRV_VERSION); err = platform_driver_register(&iTCO_wdt_driver); if (err) return err; return 0; } static void __exit iTCO_wdt_cleanup_module(void) { platform_driver_unregister(&iTCO_wdt_driver); pr_info("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("platform:" DRV_NAME);