static long rdc321x_wdt_ioctl(struct file *file, unsigned int cmd,
				unsigned long arg)
{
	void __user *argp = (void __user *)arg;
	unsigned int value;
	static struct watchdog_info ident = {
		.options = WDIOF_CARDRESET,
		.identity = "RDC321x WDT",
	};
	unsigned long flags;

	switch (cmd) {
	case WDIOC_KEEPALIVE:
		rdc321x_wdt_reset();
		break;
	case WDIOC_GETSTATUS:
		/* Read the value from the DATA register */
		spin_lock_irqsave(&rdc321x_wdt_device.lock, flags);
		value = inl(RDC3210_CFGREG_DATA);
		spin_unlock_irqrestore(&rdc321x_wdt_device.lock, flags);
		if (copy_to_user(argp, &value, sizeof(int)))
			return -EFAULT;
		break;
	case WDIOC_GETSUPPORT:
		if (copy_to_user(argp, &ident, sizeof(ident)))
			return -EFAULT;
		break;
	case WDIOC_SETOPTIONS:
		if (copy_from_user(&value, argp, sizeof(int)))
			return -EFAULT;
		switch (value) {
		case WDIOS_ENABLECARD:
			rdc321x_wdt_start();
			break;
		case WDIOS_DISABLECARD:
			return rdc321x_wdt_stop();
		default:
			return -EINVAL;
		}
		break;
	default:
		return -ENOTTY;
	}
	return 0;
}

static ssize_t rdc321x_wdt_write(struct file *file, const char __user *buf,
				size_t count, loff_t *ppos)
{
	if (!count)
		return -EIO;

	rdc321x_wdt_reset();

	return count;
}

static const struct file_operations rdc321x_wdt_fops = {
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.unlocked_ioctl	= rdc321x_wdt_ioctl,
	.open		= rdc321x_wdt_open,
	.write		= rdc321x_wdt_write,
	.release	= rdc321x_wdt_release,
};

static struct miscdevice rdc321x_wdt_misc = {
	.minor	= WATCHDOG_MINOR,
	.name	= "watchdog",
	.fops	= &rdc321x_wdt_fops,
};

static int __devinit rdc321x_wdt_probe(struct platform_device *pdev)
{
	int err;

	err = misc_register(&rdc321x_wdt_misc);
	if (err < 0) {
		printk(KERN_ERR PFX "watchdog misc_register failed\n");
		return err;
	}

	spin_lock_init(&rdc321x_wdt_device.lock);

	/* Reset the watchdog */
	outl(RDC_WDT_RST, RDC3210_CFGREG_DATA);

	init_completion(&rdc321x_wdt_device.stop);
	rdc321x_wdt_device.queue = 0;

	clear_bit(0, &rdc321x_wdt_device.inuse);

	setup_timer(&rdc321x_wdt_device.timer, rdc321x_wdt_trigger, 0);

	rdc321x_wdt_device.default_ticks = ticks;

	printk(KERN_INFO PFX "watchdog init success\n");

	return 0;
}

static int rdc321x_wdt_remove(struct platform_device *pdev)
{
	if (rdc321x_wdt_device.queue) {
		rdc321x_wdt_device.queue = 0;
		wait_for_completion(&rdc321x_wdt_device.stop);
	}

	misc_deregister(&rdc321x_wdt_misc);

	return 0;
}

static struct platform_driver rdc321x_wdt_driver = {
	.probe = rdc321x_wdt_probe,
	.remove = rdc321x_wdt_remove,
	.driver = {
		.owner = THIS_MODULE,
		.name = "rdc321x-wdt",
	},
};

static int __init rdc321x_wdt_init(void)
{
	return platform_driver_register(&rdc321x_wdt_driver);
}

static void __exit rdc321x_wdt_exit(void)
{
	platform_driver_unregister(&rdc321x_wdt_driver);
}
static long rdc321x_wdt_ioctl(struct file *file, unsigned int cmd,
				unsigned long arg)
{
	void __user *argp = (void __user *)arg;
	u32 value;
	static const struct watchdog_info ident = {
		.options = WDIOF_CARDRESET,
		.identity = "RDC321x WDT",
	};
	unsigned long flags;

	switch (cmd) {
	case WDIOC_KEEPALIVE:
		rdc321x_wdt_reset();
		break;
	case WDIOC_GETSTATUS:
		/*                                       */
		spin_lock_irqsave(&rdc321x_wdt_device.lock, flags);
		pci_read_config_dword(rdc321x_wdt_device.sb_pdev,
					rdc321x_wdt_device.base_reg, &value);
		spin_unlock_irqrestore(&rdc321x_wdt_device.lock, flags);
		if (copy_to_user(argp, &value, sizeof(u32)))
			return -EFAULT;
		break;
	case WDIOC_GETSUPPORT:
		if (copy_to_user(argp, &ident, sizeof(ident)))
			return -EFAULT;
		break;
	case WDIOC_SETOPTIONS:
		if (copy_from_user(&value, argp, sizeof(int)))
			return -EFAULT;
		switch (value) {
		case WDIOS_ENABLECARD:
			rdc321x_wdt_start();
			break;
		case WDIOS_DISABLECARD:
			return rdc321x_wdt_stop();
		default:
			return -EINVAL;
		}
		break;
	default:
		return -ENOTTY;
	}
	return 0;
}

static ssize_t rdc321x_wdt_write(struct file *file, const char __user *buf,
				size_t count, loff_t *ppos)
{
	if (!count)
		return -EIO;

	rdc321x_wdt_reset();

	return count;
}

static const struct file_operations rdc321x_wdt_fops = {
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.unlocked_ioctl	= rdc321x_wdt_ioctl,
	.open		= rdc321x_wdt_open,
	.write		= rdc321x_wdt_write,
	.release	= rdc321x_wdt_release,
};

static struct miscdevice rdc321x_wdt_misc = {
	.minor	= WATCHDOG_MINOR,
	.name	= "watchdog",
	.fops	= &rdc321x_wdt_fops,
};

static int __devinit rdc321x_wdt_probe(struct platform_device *pdev)
{
	int err;
	struct resource *r;
	struct rdc321x_wdt_pdata *pdata;

	pdata = pdev->dev.platform_data;
	if (!pdata) {
		dev_err(&pdev->dev, "no platform data supplied\n");
		return -ENODEV;
	}

	r = platform_get_resource_byname(pdev, IORESOURCE_IO, "wdt-reg");
	if (!r) {
		dev_err(&pdev->dev, "failed to get wdt-reg resource\n");
		return -ENODEV;
	}

	rdc321x_wdt_device.sb_pdev = pdata->sb_pdev;
	rdc321x_wdt_device.base_reg = r->start;

	err = misc_register(&rdc321x_wdt_misc);
	if (err < 0) {
		dev_err(&pdev->dev, "misc_register failed\n");
		return err;
	}

	spin_lock_init(&rdc321x_wdt_device.lock);

	/*                    */
	pci_write_config_dword(rdc321x_wdt_device.sb_pdev,
				rdc321x_wdt_device.base_reg, RDC_WDT_RST);

	init_completion(&rdc321x_wdt_device.stop);
	rdc321x_wdt_device.queue = 0;

	clear_bit(0, &rdc321x_wdt_device.inuse);

	setup_timer(&rdc321x_wdt_device.timer, rdc321x_wdt_trigger, 0);

	rdc321x_wdt_device.default_ticks = ticks;

	dev_info(&pdev->dev, "watchdog init success\n");

	return 0;
}

static int __devexit rdc321x_wdt_remove(struct platform_device *pdev)
{
	if (rdc321x_wdt_device.queue) {
		rdc321x_wdt_device.queue = 0;
		wait_for_completion(&rdc321x_wdt_device.stop);
	}

	misc_deregister(&rdc321x_wdt_misc);

	return 0;
}

static struct platform_driver rdc321x_wdt_driver = {
	.probe = rdc321x_wdt_probe,
	.remove = __devexit_p(rdc321x_wdt_remove),
	.driver = {
		.owner = THIS_MODULE,
		.name = "rdc321x-wdt",
	},
};

module_platform_driver(rdc321x_wdt_driver);

MODULE_AUTHOR("Florian Fainelli <*****@*****.**>");
MODULE_DESCRIPTION("RDC321x watchdog driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);