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 void iTCO_wdt_last_kick(int last_delay)
{
/* Set new heart beat giving last_delay to kernel to shutdown cleanly */
iTCO_wdt_set_heartbeat(last_delay);
/* Do a last keep alive before bypassing to allow shutdown
to proceed with new timing */
iTCO_wdt_keepalive();
bypass_keepalive = true;
}
static int iTCO_wdt_release(struct inode *inode, struct file *file)
{
/*
* Shut off the timer.
*/
if (expect_release == 42) {
iTCO_wdt_stop();
} else {
pr_crit("Unexpected close, not stopping watchdog!\n");
iTCO_wdt_keepalive();
}
clear_bit(0, &is_active);
expect_release = 0;
return 0;
}
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 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 void __devexit iTCO_wdt_cleanup(void)
{
/* Stop the timer before we leave */
if (!nowayout)
iTCO_wdt_stop();
/* Deregister */
misc_deregister(&iTCO_wdt_miscdev);
/* 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);
release_mem_region(iTCO_wdt_private.gcs_res->start,
resource_size(iTCO_wdt_private.gcs_res));
}
iTCO_wdt_private.tco_res = NULL;
iTCO_wdt_private.smi_res = NULL;
iTCO_wdt_private.gcs_res = NULL;
iTCO_wdt_private.gcs = NULL;
}
static int __devinit iTCO_wdt_probe(struct platform_device *dev)
{
int ret = -ENODEV;
unsigned long val32;
struct lpc_ich_info *ich_info = dev->dev.platform_data;
if (!ich_info)
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 = ich_info->iTCO_version;
iTCO_wdt_private.dev = dev;
iTCO_wdt_private.pdev = to_pci_dev(dev->dev.parent);
/*
* Get the Memory-Mapped GCS register, we need it for the
* NO_REBOOT flag (TCO v2).
*/
if (iTCO_wdt_private.iTCO_version == 2) {
iTCO_wdt_private.gcs_res = platform_get_resource(dev,
IORESOURCE_MEM,
ICH_RES_MEM_GCS);
if (!iTCO_wdt_private.gcs_res)
goto out;
if (!request_mem_region(iTCO_wdt_private.gcs_res->start,
resource_size(iTCO_wdt_private.gcs_res), dev->name)) {
ret = -EBUSY;
goto out;
}
iTCO_wdt_private.gcs = ioremap(iTCO_wdt_private.gcs_res->start,
resource_size(iTCO_wdt_private.gcs_res));
if (!iTCO_wdt_private.gcs) {
ret = -EIO;
goto unreg_gcs;
}
}
/* 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;
}
/* 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",
SMI_EN);
ret = -EBUSY;
goto unmap_gcs;
}
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",
TCOBASE);
ret = -EBUSY;
goto unreg_smi;
}
pr_info("Found a %s TCO device (Version=%d, TCOBASE=0x%04llx)\n",
ich_info->name, ich_info->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);
pr_info("timeout value out of range, using %d\n", heartbeat);
}
ret = misc_register(&iTCO_wdt_miscdev);
if (ret != 0) {
pr_err("cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, 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:
if (iTCO_wdt_private.iTCO_version == 2)
iounmap(iTCO_wdt_private.gcs);
unreg_gcs:
if (iTCO_wdt_private.iTCO_version == 2)
release_mem_region(iTCO_wdt_private.gcs_res->start,
resource_size(iTCO_wdt_private.gcs_res));
out:
iTCO_wdt_private.tco_res = NULL;
iTCO_wdt_private.smi_res = NULL;
iTCO_wdt_private.gcs_res = NULL;
iTCO_wdt_private.gcs = NULL;
return ret;
}
static int __devexit 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();
}
#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;
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 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,
};
/*
* Reboot notifier
*/
static int TCO_reboot_notifier(struct notifier_block *this,
unsigned long code,
void *another_unused)
{
if (code == SYS_HALT || code == SYS_POWER_OFF) {
iTCO_wdt_set_reset_type(TCO_POLICY_HALT);
}
iTCO_wdt_last_kick(5);
#ifdef CONFIG_DEBUG_FS
if (iTCO_wdt_private.panic_reboot_notifier) {
BUG();
}
#endif
return NOTIFY_DONE;
}
static irqreturn_t tco_irq_handler(int irq, void *arg)
{
pr_warn("[SHTDWN] %s, WATCHDOG TIMEOUT HANDLER!\n", __func__);
/* reduce the timeout to the minimum, but sufficient for tracing */
bypass_keepalive = false;
iTCO_wdt_last_kick(15);
trigger_all_cpu_backtrace();
/* Let the watchdog reset the board */
panic_timeout = 0;
panic("Kernel Watchdog");
/* This code should not be reached */
return IRQ_HANDLED;
}
static ssize_t shutdown_ongoing_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size)
{
iTCO_wdt_set_reset_type(TCO_POLICY_HALT);
return size;
}
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,
};
/*
* Reboot notifier
*/
static int TCO_reboot_notifier(struct notifier_block *this,
unsigned long code,
void *another_unused)
{
if (code == SYS_HALT || code == SYS_POWER_OFF) {
iTCO_wdt_set_reset_type(TCO_POLICY_HALT);
}
iTCO_wdt_last_kick(5);
#ifdef CONFIG_DEBUG_FS
if (iTCO_wdt_private.panic_reboot_notifier) {
BUG();
}
#endif
return NOTIFY_DONE;
}
static irqreturn_t tco_irq_handler(int irq, void *arg)
{
unsigned long val32;
pr_warn("[SHTDWN] %s, WATCHDOG TIMEOUT HANDLER!\n", __func__);
/* reduce the timeout to the minimum, but sufficient for tracing */
iTCO_wdt_set_heartbeat(15);
iTCO_wdt_keepalive();
trigger_all_cpu_backtrace();
panic("Kernel Watchdog");
/* This code should not be reached */
return IRQ_HANDLED;
}
/*
* Init & exit routines
*/
static int iTCO_wdt_init(struct pci_dev *pdev,
const struct pci_device_id *ent, struct platform_device *dev)
{
int ret;
u32 base_address;
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 */
pr_err("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;
pci_read_config_dword(pdev, 0x44, &pmc_base_address);
pmc_base_address &= 0xFFFFFE00;
/*
* Disable watchdog on command-line demand
*/
if (strstr(saved_command_line, "disable_kernel_watchdog=1")) {
pr_warn("disable_kernel_watchdog=1 watchdog will not be started\n");
iTCO_wdt_private.enable = false;
/* Set the NO_REBOOT bit to prevent later reboots */
iTCO_wdt_set_NO_REBOOT_bit();
/* Ensure Wdt is well stopped in case started by IAFW */
iTCO_wdt_stop();
} else {
iTCO_wdt_private.enable = true;
/* Check chipset's NO_REBOOT bit */
if (iTCO_wdt_unset_NO_REBOOT_bit()) {
pr_err("unable to reset NO_REBOOT flag, device disabled by hardware/BIOS\n");
ret = -ENODEV; /* Cannot reset NO_REBOOT bit */
goto out;
}
}
/* The TCO logic uses the TCO_EN bit in the SMI_EN register */
if (!request_region(SMI_EN, 4, "iTCO_wdt")) {
pr_err("I/O address 0x%04lx already in use, device disabled\n",
SMI_EN);
ret = -EIO;
goto out;
}
if (!request_region(SMI_STS, 4, "iTCO_wdt")) {
pr_err("I/O address 0x%04lx already in use, device disabled\n",
SMI_STS);
ret = -EIO;
goto unreg_smi_sts;
}
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 &= ~TCO_EN_BIT; /* Turn off TCO watchdog timer */
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")) {
pr_err("I/O address 0x%04lx already in use, device disabled\n",
TCOBASE);
ret = -EIO;
goto unreg_smi_en;
}
pr_info("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);
/* 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);
pr_info("timeout value out of range, using %d\n", heartbeat);
}
ret = misc_register(&iTCO_wdt_miscdev);
if (ret != 0) {
pr_err("cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, ret);
goto unreg_region;
}
pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
heartbeat, nowayout);
/* Reset OS policy */
iTCO_wdt_set_reset_type(TCO_POLICY_NORM);
ret = acpi_register_gsi(NULL, TCO_WARNING_IRQ,
ACPI_EDGE_SENSITIVE, ACPI_ACTIVE_HIGH);
if (ret < 0) {
pr_err("failed to configure TCO warning IRQ %d\n", TCO_WARNING_IRQ);
goto misc_unreg;
}
ret = request_irq(TCO_WARNING_IRQ, tco_irq_handler, 0, "tco_watchdog", NULL);
if (ret < 0) {
pr_err("failed to request TCO warning IRQ %d\n", TCO_WARNING_IRQ);
goto gsi_unreg;
}
/* Clear old TCO timeout status */
val32 = TCO_TIMEOUT_BIT | SECOND_TO_STS_BIT;
outl(val32, TCO1_STS);
/* Clear the SMI status */
outl(TCO_STS_BIT, SMI_STS);
/* Enable SMI for TCO */
val32 = inl(SMI_EN);
val32 |= TCO_EN_BIT;
outl(val32, SMI_EN);
/* then ensure that PMC is ready to handle next SMI */
val32 |= EOS_BIT;
outl(val32, SMI_EN);
reboot_notifier.notifier_call = TCO_reboot_notifier;
reboot_notifier.priority = 1;
ret = register_reboot_notifier(&reboot_notifier);
if (ret)
/* We continue as reboot notifier is not critical for
* watchdog */
pr_err("cannot register reboot notifier %d\n", ret);
return 0;
gsi_unreg:
acpi_unregister_gsi(TCO_WARNING_IRQ);
misc_unreg:
misc_deregister(&iTCO_wdt_miscdev);
unreg_region:
release_region(TCOBASE, 0x20);
unreg_smi_sts:
release_region(SMI_STS, 4);
unreg_smi_en:
release_region(SMI_EN, 4);
out:
iTCO_wdt_private.ACPIBASE = 0;
return ret;
}