diff options
| -rw-r--r-- | drivers/char/watchdog/Kconfig | 21 | ||||
| -rw-r--r-- | drivers/char/watchdog/Makefile | 1 | ||||
| -rw-r--r-- | drivers/char/watchdog/iTCO_wdt.c | 706 |
3 files changed, 728 insertions, 0 deletions
diff --git a/drivers/char/watchdog/Kconfig b/drivers/char/watchdog/Kconfig index 06f3fa2..89e46d6 100644 --- a/drivers/char/watchdog/Kconfig +++ b/drivers/char/watchdog/Kconfig @@ -316,6 +316,27 @@ config I8XX_TCO To compile this driver as a module, choose M here: the module will be called i8xx_tco. +config ITCO_WDT + tristate "Intel TCO Timer/Watchdog (EXPERIMENTAL)" + depends on WATCHDOG && (X86 || IA64) && PCI && EXPERIMENTAL + ---help--- + Hardware driver for the intel TCO timer based watchdog devices. + These drivers are included in the Intel 82801 I/O Controller + Hub family 'from ICH0 up to ICH7) and in the Intel 6300ESB + controller hub. + + The TCO (Total Cost of Ownership) timer is a watchdog timer + that will reboot the machine after its second expiration. The + expiration time can be configured with the "heartbeat" parameter. + + On some motherboards the driver may fail to reset the chipset's + NO_REBOOT flag which prevents the watchdog from rebooting the + machine. If this is the case you will get a kernel message like + "failed to reset NO_REBOOT flag, reboot disabled by hardware". + + To compile this driver as a module, choose M here: the + module will be called iTCO_wdt. + config SC1200_WDT tristate "National Semiconductor PC87307/PC97307 (ala SC1200) Watchdog" depends on WATCHDOG && X86 diff --git a/drivers/char/watchdog/Makefile b/drivers/char/watchdog/Makefile index 6ffca7c..7f70aba 100644 --- a/drivers/char/watchdog/Makefile +++ b/drivers/char/watchdog/Makefile @@ -47,6 +47,7 @@ obj-$(CONFIG_IBMASR) += ibmasr.o obj-$(CONFIG_WAFER_WDT) += wafer5823wdt.o obj-$(CONFIG_I6300ESB_WDT) += i6300esb.o obj-$(CONFIG_I8XX_TCO) += i8xx_tco.o +obj-$(CONFIG_ITCO_WDT) += iTCO_wdt.o obj-$(CONFIG_SC1200_WDT) += sc1200wdt.o obj-$(CONFIG_SCx200_WDT) += scx200_wdt.o obj-$(CONFIG_60XX_WDT) += sbc60xxwdt.o diff --git a/drivers/char/watchdog/iTCO_wdt.c b/drivers/char/watchdog/iTCO_wdt.c new file mode 100644 index 0000000..c1a5787 --- /dev/null +++ b/drivers/char/watchdog/iTCO_wdt.c @@ -0,0 +1,706 @@ +/* + * intel TCO Watchdog Driver (Used in i82801 and i6300ESB chipsets) + * + * (c) Copyright 2006 Wim Van Sebroeck <wim@iguana.be>. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor + * provide warranty for any of this software. This material is + * provided "AS-IS" and at no charge. + * + * The TCO watchdog is implemented in the following I/O controller hubs: + * (See the intel documentation on http://developer.intel.com.) + * 82801AA (ICH) : document number 290655-003, 290677-014, + * 82801AB (ICHO) : document number 290655-003, 290677-014, + * 82801BA (ICH2) : document number 290687-002, 298242-027, + * 82801BAM (ICH2-M) : document number 290687-002, 298242-027, + * 82801CA (ICH3-S) : document number 290733-003, 290739-013, + * 82801CAM (ICH3-M) : document number 290716-001, 290718-007, + * 82801DB (ICH4) : document number 290744-001, 290745-020, + * 82801DBM (ICH4-M) : document number 252337-001, 252663-005, + * 82801E (C-ICH) : document number 273599-001, 273645-002, + * 82801EB (ICH5) : document number 252516-001, 252517-003, + * 82801ER (ICH5R) : document number 252516-001, 252517-003, + * 82801FB (ICH6) : document number 301473-002, 301474-007, + * 82801FR (ICH6R) : document number 301473-002, 301474-007, + * 82801FBM (ICH6-M) : document number 301473-002, 301474-007, + * 82801FW (ICH6W) : document number 301473-001, 301474-007, + * 82801FRW (ICH6RW) : document number 301473-001, 301474-007, + * 82801GB (ICH7) : document number 307013-002, 307014-009, + * 82801GR (ICH7R) : document number 307013-002, 307014-009, + * 82801GDH (ICH7DH) : document number 307013-002, 307014-009, + * 82801GBM (ICH7-M) : document number 307013-002, 307014-009, + * 82801GHM (ICH7-M DH) : document number 307013-002, 307014-009, + * 6300ESB (6300ESB) : document number 300641-003 + */ + +/* + * Includes, defines, variables, module parameters, ... + */ + +/* Module and version information */ +#define DRV_NAME "iTCO_wdt" +#define DRV_VERSION "1.00" +#define DRV_RELDATE "21-May-2006" +#define PFX DRV_NAME ": " + +/* Includes */ +#include <linux/config.h> /* For CONFIG_WATCHDOG_NOWAYOUT/... */ +#include <linux/module.h> /* For module specific items */ +#include <linux/moduleparam.h> /* For new moduleparam's */ +#include <linux/types.h> /* For standard types (like size_t) */ +#include <linux/errno.h> /* For the -ENODEV/... values */ +#include <linux/kernel.h> /* For printk/panic/... */ +#include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */ +#include <linux/watchdog.h> /* For the watchdog specific items */ +#include <linux/notifier.h> /* For notifier support */ +#include <linux/reboot.h> /* For reboot_notifier stuff */ +#include <linux/init.h> /* For __init/__exit/... */ +#include <linux/fs.h> /* For file operations */ +#include <linux/pci.h> /* For pci functions */ +#include <linux/ioport.h> /* For io-port access */ +#include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ + +#include <asm/uaccess.h> /* For copy_to_user/put_user/... */ +#include <asm/io.h> /* For inb/outb/... */ + +/* TCO related info */ +enum iTCO_chipsets { + TCO_ICH = 0, /* ICH */ + TCO_ICH0, /* ICH0 */ + TCO_ICH2, /* ICH2 */ + TCO_ICH2M, /* ICH2-M */ + TCO_ICH3, /* ICH3-S */ + TCO_ICH3M, /* ICH3-M */ + TCO_ICH4, /* ICH4 */ + TCO_ICH4M, /* ICH4-M */ + TCO_CICH, /* C-ICH */ + TCO_ICH5, /* ICH5 & ICH5R */ + TCO_6300ESB, /* 6300ESB */ + TCO_ICH6, /* ICH6 & ICH6R */ + TCO_ICH6M, /* ICH6-M */ + TCO_ICH6W, /* ICH6W & ICH6RW */ + TCO_ICH7, /* ICH7 & ICH7R */ + TCO_ICH7M, /* ICH7-M */ + TCO_ICH7MDH, /* ICH7-M DH */ +}; + +static struct { + char *name; + unsigned int iTCO_version; +} iTCO_chipset_info[] __devinitdata = { + {"ICH", 1}, + {"ICH0", 1}, + {"ICH2", 1}, + {"ICH2-M", 1}, + {"ICH3-S", 1}, + {"ICH3-M", 1}, + {"ICH4", 1}, + {"ICH4-M", 1}, + {"C-ICH", 1}, + {"ICH5 or ICH5R", 1}, + {"6300ESB", 1}, + {"ICH6 or ICH6R", 2}, + {"ICH6-M", 2}, + {"ICH6W or ICH6RW", 2}, + {"ICH7 or ICH7R", 2}, + {"ICH7-M", 2}, + {"ICH7-M DH", 2}, + {NULL,0} +}; + +/* + * This data only exists for exporting the supported PCI ids + * via MODULE_DEVICE_TABLE. We do not actually register a + * pci_driver, because the I/O Controller Hub has also other + * functions that probably will be registered by other drivers. + */ +static struct pci_device_id iTCO_wdt_pci_tbl[] = { + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AA_0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH }, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AB_0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH0 }, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH2 }, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_10, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH2M }, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH3 }, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH3M }, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH4 }, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH4M }, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801E_0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_CICH }, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH5 }, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_1, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_6300ESB }, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH6 }, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH6M }, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_2, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH6W }, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH7 }, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_1, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH7M }, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_31, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TCO_ICH7MDH }, + { 0, }, /* End of list */ +}; +MODULE_DEVICE_TABLE (pci, iTCO_wdt_pci_tbl); + +/* Address definitions for the TCO */ +#define TCOBASE iTCO_wdt_private.ACPIBASE + 0x60 /* TCO base address */ +#define SMI_EN iTCO_wdt_private.ACPIBASE + 0x30 /* SMI Control and Enable Register */ + +#define TCO_RLD TCOBASE + 0x00 /* TCO Timer Reload and Current Value */ +#define TCOv1_TMR TCOBASE + 0x01 /* TCOv1 Timer Initial Value */ +#define TCO_DAT_IN TCOBASE + 0x02 /* TCO Data In Register */ +#define TCO_DAT_OUT TCOBASE + 0x03 /* TCO Data Out Register */ +#define TCO1_STS TCOBASE + 0x04 /* TCO1 Status Register */ +#define TCO2_STS TCOBASE + 0x06 /* TCO2 Status Register */ +#define TCO1_CNT TCOBASE + 0x08 /* TCO1 Control Register */ +#define TCO2_CNT TCOBASE + 0x0a /* TCO2 Control Register */ +#define TCOv2_TMR TCOBASE + 0x12 /* TCOv2 Timer Initial Value */ + +/* internal variables */ +static unsigned long is_active; +static char expect_release; +static struct { /* this is private data for the iTCO_wdt device */ + unsigned int iTCO_version; /* TCO version/generation */ + unsigned long ACPIBASE; /* The cards ACPIBASE address (TCOBASE = ACPIBASE+0x60) */ + unsigned long __iomem *gcs; /* NO_REBOOT flag is Memory-Mapped GCS register bit 5 (TCO version 2) */ + spinlock_t io_lock; /* the lock for io operations */ + struct pci_dev *pdev; /* the PCI-device */ +} iTCO_wdt_private; + +/* module parameters */ +#define WATCHDOG_HEARTBEAT 30 /* 30 sec default heartbeat */ +static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */ +module_param(heartbeat, int, 0); +MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2<heartbeat<39 (TCO v1) or 613 (TCO v2), default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); + +static int nowayout = WATCHDOG_NOWAYOUT; +module_param(nowayout, int, 0); +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); + +/* + * Some TCO specific functions + */ + +static inline unsigned int seconds_to_ticks(int seconds) +{ + /* the internal timer is stored as ticks which decrement + * every 0.6 seconds */ + return (seconds * 10) / 6; +} + +static void iTCO_wdt_set_NO_REBOOT_bit(void) +{ + u32 val32; + + /* Set the NO_REBOOT bit: this disables reboots */ + if (iTCO_wdt_private.iTCO_version == 2) { + val32 = readl(iTCO_wdt_private.gcs); + val32 |= 0x00000020; + writel(val32, iTCO_wdt_private.gcs); + } else if (iTCO_wdt_private.iTCO_version == 1) { + pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32); + val32 |= 0x00000002; + pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32); + } +} + +static int iTCO_wdt_unset_NO_REBOOT_bit(void) +{ + int ret = 0; + u32 val32; + + /* Unset the NO_REBOOT bit: this enables reboots */ + if (iTCO_wdt_private.iTCO_version == 2) { + val32 = readl(iTCO_wdt_private.gcs); + val32 &= 0xffffffdf; + writel(val32, iTCO_wdt_private.gcs); + + val32 = readl(iTCO_wdt_private.gcs); + if (val32 & 0x00000020) + ret = -EIO; + } else if (iTCO_wdt_private.iTCO_version == 1) { + pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32); + val32 &= 0xfffffffd; + pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32); + + pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32); + if (val32 & 0x00000002) + ret = -EIO; + } + + return ret; /* returns: 0 = OK, -EIO = Error */ +} + +static int iTCO_wdt_start(void) +{ + unsigned int val; + + spin_lock(&iTCO_wdt_private.io_lock); + + /* disable chipset's NO_REBOOT bit */ + if (iTCO_wdt_unset_NO_REBOOT_bit()) { + printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, reboot disabled by hardware\n"); + return -EIO; + } + + /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled to count */ + val = inw(TCO1_CNT); + val &= 0xf7ff; + outw(val, TCO1_CNT); + val = inw(TCO1_CNT); + spin_unlock(&iTCO_wdt_private.io_lock); + + if (val & 0x0800) + return -1; + return 0; +} + +static int iTCO_wdt_stop(void) +{ + unsigned int val; + + spin_lock(&iTCO_wdt_private.io_lock); + + /* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */ + val = inw(TCO1_CNT); + val |= 0x0800; + outw(val, TCO1_CNT); + val = inw(TCO1_CNT); + + /* Set the NO_REBOOT bit to prevent later reboots, just for sure */ + iTCO_wdt_set_NO_REBOOT_bit(); + + spin_unlock(&iTCO_wdt_private.io_lock); + + if ((val & 0x0800) == 0) + return -1; + return 0; +} + +static int iTCO_wdt_keepalive(void) +{ + spin_lock(&iTCO_wdt_private.io_lock); + + /* Reload the timer by writing to the TCO Timer Counter register */ + if (iTCO_wdt_private.iTCO_version == 2) { + outw(0x01, TCO_RLD); + } else if (iTCO_wdt_private.iTCO_version == 1) { + outb(0x01, TCO_RLD); + } + + spin_unlock(&iTCO_wdt_private.io_lock); + return 0; +} + +static int iTCO_wdt_set_heartbeat(int t) +{ + unsigned int val16; + unsigned char val8; + unsigned int tmrval; + + tmrval = seconds_to_ticks(t); + /* from the specs: */ + /* "Values of 0h-3h are ignored and should not be attempted" */ + if (tmrval < 0x04) + return -EINVAL; + if (((iTCO_wdt_private.iTCO_version == 2) && (tmrval > 0x3ff)) || + ((iTCO_wdt_private.iTCO_version == 1) && (tmrval > 0x03f))) + return -EINVAL; + + /* Write new heartbeat to watchdog */ + if (iTCO_wdt_private.iTCO_version == 2) { + spin_lock(&iTCO_wdt_private.io_lock); + val16 = inw(TCOv2_TMR); + val16 &= 0xfc00; + val16 |= tmrval; + outw(val16, TCOv2_TMR); + val16 = inw(TCOv2_TMR); + spin_unlock(&iTCO_wdt_private.io_lock); + + if ((val16 & 0x3ff) != tmrval) + return -EINVAL; + } else if (iTCO_wdt_private.iTCO_version == 1) { + spin_lock(&iTCO_wdt_private.io_lock); + val8 = inb(TCOv1_TMR); + val8 &= 0xc0; + val8 |= (tmrval & 0xff); + outb(val8, TCOv1_TMR); + val8 = inb(TCOv1_TMR); + spin_unlock(&iTCO_wdt_private.io_lock); + + if ((val8 & 0x3f) != tmrval) + return -EINVAL; + } + + heartbeat = t; + return 0; +} + +static int iTCO_wdt_get_timeleft (int *time_left) +{ + unsigned int val16; + unsigned char val8; + + /* read the TCO Timer */ + if (iTCO_wdt_private.iTCO_version == 2) { + spin_lock(&iTCO_wdt_private.io_lock); + val16 = inw(TCO_RLD); + val16 &= 0x3ff; + spin_unlock(&iTCO_wdt_private.io_lock); + + *time_left = (val16 * 6) / 10; + } else if (iTCO_wdt_private.iTCO_version == 1) { + spin_lock(&iTCO_wdt_private.io_lock); + val8 = inb(TCO_RLD); + val8 &= 0x3f; + spin_unlock(&iTCO_wdt_private.io_lock); + + *time_left = (val8 * 6) / 10; + } + return 0; +} + +/* + * /dev/watchdog handling + */ + +static int iTCO_wdt_open (struct inode *inode, struct file *file) +{ + /* /dev/watchdog can only be opened once */ + if (test_and_set_bit(0, &is_active)) + return -EBUSY; + + /* + * Reload and activate timer + */ + iTCO_wdt_keepalive(); + iTCO_wdt_start(); + return nonseekable_open(inode, file); +} + +static int iTCO_wdt_release (struct inode *inode, struct file *file) +{ + /* + * Shut off the timer. + */ + if (expect_release == 42) { + iTCO_wdt_stop(); + } else { + printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); + iTCO_wdt_keepalive(); + } + clear_bit(0, &is_active); + expect_release = 0; + return 0; +} + +static ssize_t iTCO_wdt_write (struct file *file, const char __user *data, + size_t len, loff_t * ppos) +{ + /* See if we got the magic character 'V' and reload the timer */ + if (len) { + if (!nowayout) { + size_t i; + + /* note: just in case someone wrote the magic character + * five months ago... */ + expect_release = 0; + + /* scan to see whether or not we got the magic character */ + for (i = 0; i != len; i++) { + char c; + if (get_user(c, data+i)) + return -EFAULT; + if (c == 'V') + expect_release = 42; + } + } + + /* someone wrote to us, we should reload the timer */ + iTCO_wdt_keepalive(); + } + return len; +} + +static int iTCO_wdt_ioctl (struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + int new_options, retval = -EINVAL; + int new_heartbeat; + int time_left; + void __user *argp = (void __user *)arg; + int __user *p = argp; + static struct watchdog_info ident = { + .options = WDIOF_SETTIMEOUT | + WDIOF_KEEPALIVEPING | + WDIOF_MAGICCLOSE, + .firmware_version = 0, + .identity = DRV_NAME, + }; + + switch (cmd) { + case WDIOC_GETSUPPORT: + return copy_to_user(argp, &ident, + sizeof (ident)) ? -EFAULT : 0; + + case WDIOC_GETSTATUS: + case WDIOC_GETBOOTSTATUS: + return put_user(0, p); + + case WDIOC_KEEPALIVE: + iTCO_wdt_keepalive(); + return 0; + + case WDIOC_SETOPTIONS: + { + if (get_user(new_options, p)) + return -EFAULT; + + if (new_options & WDIOS_DISABLECARD) { + iTCO_wdt_stop(); + retval = 0; + } + + if (new_options & WDIOS_ENABLECARD) { + iTCO_wdt_keepalive(); + iTCO_wdt_start(); + retval = 0; + } + + return retval; + } + + case WDIOC_SETTIMEOUT: + { + if (get_user(new_heartbeat, p)) + return -EFAULT; + + if (iTCO_wdt_set_heartbeat(new_heartbeat)) + return -EINVAL; + + iTCO_wdt_keepalive(); + /* Fall */ + } + + case WDIOC_GETTIMEOUT: + return put_user(heartbeat, p); + + case WDIOC_GETTIMELEFT: + { + if (iTCO_wdt_get_timeleft(&time_left)) + return -EINVAL; + + return put_user(time_left, p); + } + + default: + return -ENOIOCTLCMD; + } +} + +/* + * Notify system + */ + +static int iTCO_wdt_notify_sys (struct notifier_block *this, unsigned long code, void *unused) +{ + if (code==SYS_DOWN || code==SYS_HALT) { + /* Turn the WDT off */ + iTCO_wdt_stop(); + } + + return NOTIFY_DONE; +} + +/* + * Kernel Interfaces + */ + +static struct file_operations iTCO_wdt_fops = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .write = iTCO_wdt_write, + .ioctl = iTCO_wdt_ioctl, + .open = iTCO_wdt_open, + .release = iTCO_wdt_release, +}; + +static struct miscdevice iTCO_wdt_miscdev = { + .minor = WATCHDOG_MINOR, + .name = "watchdog", + .fops = &iTCO_wdt_fops, +}; + +static struct notifier_block iTCO_wdt_notifier = { + .notifier_call = iTCO_wdt_notify_sys, +}; + +/* + * Init & exit routines + */ + +static int __init iTCO_wdt_init(struct pci_dev *pdev, const struct pci_device_id *ent) +{ + int ret; + u32 base_address; + unsigned long RCBA; + unsigned long val32; + + /* + * Find the ACPI/PM base I/O address which is the base + * for the TCO registers (TCOBASE=ACPIBASE + 0x60) + * ACPIBASE is bits [15:7] from 0x40-0x43 + */ + pci_read_config_dword(pdev, 0x40, &base_address); + base_address &= 0x00007f80; + if (base_address == 0x00000000) { + /* Something's wrong here, ACPIBASE has to be set */ + printk(KERN_ERR PFX "failed to get TCOBASE address\n"); + return -ENODEV; + } + iTCO_wdt_private.iTCO_version = iTCO_chipset_info[ent->driver_data].iTCO_version; + iTCO_wdt_private.ACPIBASE = base_address; + iTCO_wdt_private.pdev = pdev; + + /* Get the Memory-Mapped GCS register, we need it for the NO_REBOOT flag (TCO v2) */ + /* To get access to it you have to read RCBA from PCI Config space 0xf0 + and use it as base. GCS = RCBA + ICH6_GCS(0x3410). */ + if (iTCO_wdt_private.iTCO_version == 2) { + pci_read_config_dword(pdev, 0xf0, &base_address); + RCBA = base_address & 0xffffc000; + iTCO_wdt_private.gcs = ioremap((RCBA + 0x3410),4); + } + + /* Check chipset's NO_REBOOT bit */ + if (iTCO_wdt_unset_NO_REBOOT_bit()) { + printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, reboot disabled by hardware\n"); + ret = -ENODEV; /* Cannot reset NO_REBOOT bit */ + goto out; + } + + /* Set the NO_REBOOT bit to prevent later reboots, just for sure */ + iTCO_wdt_set_NO_REBOOT_bit(); + + /* Set the TCO_EN bit in SMI_EN register */ + if (!request_region(SMI_EN, 4, "iTCO_wdt")) { + printk(KERN_ERR PFX "I/O address 0x%04lx already in use\n", + SMI_EN ); + ret = -EIO; + goto out; + } + val32 = inl(SMI_EN); + val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */ + outl(val32, SMI_EN); + release_region(SMI_EN, 4); + + /* The TCO I/O registers reside in a 32-byte range pointed to by the TCOBASE value */ + if (!request_region (TCOBASE, 0x20, "iTCO_wdt")) { + printk (KERN_ERR PFX "I/O address 0x%04lx already in use\n", + TCOBASE); + ret = -EIO; + goto out; + } + + printk(KERN_INFO PFX "Found a %s TCO device (Version=%d, TCOBASE=0x%04lx)\n", + iTCO_chipset_info[ent->driver_data].name, + iTCO_chipset_info[ent->driver_data].iTCO_version, + TCOBASE); + + /* Clear out the (probably old) status */ + outb(0, TCO1_STS); + outb(3, TCO2_STS); + + /* Make sure the watchdog is not running */ + iTCO_wdt_stop(); + + /* Check that the heartbeat value is within it's range ; if not reset to the default */ + if (iTCO_wdt_set_heartbeat(heartbeat)) { + iTCO_wdt_set_heartbeat(WATCHDOG_HEARTBEAT); + printk(KERN_INFO PFX "heartbeat value must be 2<heartbeat<39 (TCO v1) or 613 (TCO v2), using %d\n", + heartbeat); + } + + ret = register_reboot_notifier(&iTCO_wdt_notifier); + if (ret != 0) { + printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", + ret); + goto unreg_region; + } + + 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_notifier; + } + + printk (KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", + heartbeat, nowayout); + + return 0; + +unreg_notifier: + unregister_reboot_notifier(&iTCO_wdt_notifier); +unreg_region: + release_region (TCOBASE, 0x20); +out: + if (iTCO_wdt_private.iTCO_version == 2) + iounmap(iTCO_wdt_private.gcs); + iTCO_wdt_private.ACPIBASE = 0; + return ret; +} + +static void __exit iTCO_wdt_cleanup(void) +{ + /* Stop the timer before we leave */ + if (!nowayout) + iTCO_wdt_stop(); + + /* Deregister */ + misc_deregister(&iTCO_wdt_miscdev); + unregister_reboot_notifier(&iTCO_wdt_notifier); + release_region(TCOBASE, 0x20); + if (iTCO_wdt_private.iTCO_version == 2) + iounmap(iTCO_wdt_private.gcs); +} + +static int __init iTCO_wdt_init_module(void) +{ + int found = 0; + struct pci_dev *pdev = NULL; + const struct pci_device_id *ent; + + spin_lock_init(&iTCO_wdt_private.io_lock); + + for_each_pci_dev(pdev) { + ent = pci_match_id(iTCO_wdt_pci_tbl, pdev); + if (ent) { + if (!(iTCO_wdt_init(pdev, ent))) { + found++; + break; + } + } + } + + if (!found) { + printk(KERN_INFO PFX "No card detected\n"); + return -ENODEV; + } + + return 0; +} + +static void __exit iTCO_wdt_cleanup_module(void) +{ + if (iTCO_wdt_private.ACPIBASE) + iTCO_wdt_cleanup(); + + 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_LICENSE("GPL"); +MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |