ssize_t dw_wdt_write(struct file *filp, const char __user *buf, size_t len,
		     loff_t *offset)
{
	if (!len)
		return 0;

	if (!nowayout) {
		size_t i;

		dw_wdt.expect_close = 0;

		for (i = 0; i < len; ++i) {
			char c;

			if (get_user(c, buf + i))
				return -EFAULT;

			if (c == 'V') {
				dw_wdt.expect_close = 1;
				break;
			}
		}
	}

	dw_wdt_set_next_heartbeat();
	mod_timer(&dw_wdt.timer, jiffies + WDT_TIMEOUT);

	return len;
}
Example #2
0
static int dw_wdt_set_top(unsigned top_s)
{
	int i, top_val = DW_WDT_MAX_TOP;

	/*
	 * Iterate over the timeout values until we find the closest match. We
	 * always look for >=.
	 */
	for (i = 0; i <= DW_WDT_MAX_TOP; ++i)
		if (dw_wdt_top_in_seconds(i) >= top_s) {
			top_val = i;
			break;
		}

	/*
	 * Set the new value in the watchdog.  Some versions of dw_wdt
	 * have have TOPINIT in the TIMEOUT_RANGE register (as per
	 * CP_WDT_DUAL_TOP in WDT_COMP_PARAMS_1).  On those we
	 * effectively get a pat of the watchdog right here.
	 */
	writel(top_val | top_val << WDOG_TIMEOUT_RANGE_TOPINIT_SHIFT,
		dw_wdt.regs + WDOG_TIMEOUT_RANGE_REG_OFFSET);

	/*
	 * Add an explicit pat to handle versions of the watchdog that
	 * don't have TOPINIT.  This won't hurt on versions that have
	 * it.
	 */
	dw_wdt_keepalive();

	dw_wdt_set_next_heartbeat();

	return dw_wdt_top_in_seconds(top_val);
}
Example #3
0
static int dw_wdt_open(struct inode *inode, struct file *filp)
{
	if (test_and_set_bit(0, &dw_wdt.in_use))
		return -EBUSY;

	/* Make sure we don't get unloaded. */
	__module_get(THIS_MODULE);

	spin_lock(&dw_wdt.lock);
	if (!dw_wdt_is_enabled()) {
		/*
		 * The watchdog is not currently enabled. Set the timeout to
		 * the maximum and then start it.
		 */
		dw_wdt_set_top(DW_WDT_MAX_TOP);
		writel(WDOG_CONTROL_REG_WDT_EN_MASK,
		       dw_wdt.regs + WDOG_CONTROL_REG_OFFSET);
	}

	dw_wdt_set_next_heartbeat();

	spin_unlock(&dw_wdt.lock);

	return nonseekable_open(inode, filp);
}
static int dw_wdt_set_top(unsigned top_s)
{
	int i, top_val = DW_WDT_MAX_TOP;

	for (i = 0; i <= DW_WDT_MAX_TOP; ++i)
		if (dw_wdt_top_in_seconds(i) >= top_s) {
			top_val = i;
			break;
		}

	
	writel(top_val, dw_wdt.regs + WDOG_TIMEOUT_RANGE_REG_OFFSET);

	dw_wdt_set_next_heartbeat();

	return dw_wdt_top_in_seconds(top_val);
}
Example #5
0
static int __devinit dw_wdt_drv_probe(struct platform_device *pdev)
{
	int ret;
	struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!mem)
		return -EINVAL;

	if (!devm_request_mem_region(&pdev->dev, mem->start, resource_size(mem),
				     "dw_wdt"))
		return -ENOMEM;

	dw_wdt.regs = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
	if (!dw_wdt.regs)
		return -ENOMEM;

	dw_wdt.clk = clk_get(&pdev->dev, NULL);
	if (IS_ERR(dw_wdt.clk))
		return PTR_ERR(dw_wdt.clk);

	ret = clk_enable(dw_wdt.clk);
	if (ret)
		goto out_put_clk;

	spin_lock_init(&dw_wdt.lock);

	ret = misc_register(&dw_wdt_miscdev);
	if (ret)
		goto out_disable_clk;

	dw_wdt_set_next_heartbeat();
	setup_timer(&dw_wdt.timer, dw_wdt_ping, 0);
	mod_timer(&dw_wdt.timer, jiffies + WDT_TIMEOUT);

	return 0;

out_disable_clk:
	clk_disable(dw_wdt.clk);
out_put_clk:
	clk_put(dw_wdt.clk);

	return ret;
}
static int dw_wdt_open(struct inode *inode, struct file *filp)
{
	if (test_and_set_bit(0, &dw_wdt.in_use))
		return -EBUSY;

	
	__module_get(THIS_MODULE);

	spin_lock(&dw_wdt.lock);
	if (!dw_wdt_is_enabled()) {
		dw_wdt_set_top(DW_WDT_MAX_TOP);
		writel(WDOG_CONTROL_REG_WDT_EN_MASK,
		       dw_wdt.regs + WDOG_CONTROL_REG_OFFSET);
	}

	dw_wdt_set_next_heartbeat();

	spin_unlock(&dw_wdt.lock);

	return nonseekable_open(inode, filp);
}
Example #7
0
static int dw_wdt_set_top(unsigned top_s)
{
	int i, top_val = DW_WDT_MAX_TOP;

	/*
	 * Iterate over the timeout values until we find the closest match. We
	 * always look for >=.
	 */
	for (i = 0; i <= DW_WDT_MAX_TOP; ++i)
		if (dw_wdt_top_in_seconds(i) >= top_s) {
			top_val = i;
			break;
		}

	/* Set the new value in the watchdog. */
	writel(top_val, dw_wdt.regs + WDOG_TIMEOUT_RANGE_REG_OFFSET);

	dw_wdt_set_next_heartbeat();

	return dw_wdt_top_in_seconds(top_val);
}
static long dw_wdt_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	unsigned long val;
	int timeout;

	switch (cmd) {
	case WDIOC_GETSUPPORT:
		return copy_to_user((struct watchdog_info *)arg, &dw_wdt_ident,
				    sizeof(dw_wdt_ident)) ? -EFAULT : 0;

	case WDIOC_GETSTATUS:
	case WDIOC_GETBOOTSTATUS:
		return put_user(0, (int *)arg);

	case WDIOC_KEEPALIVE:
		dw_wdt_set_next_heartbeat();
		return 0;

	case WDIOC_SETTIMEOUT:
		if (get_user(val, (int __user *)arg))
			return -EFAULT;
		timeout = dw_wdt_set_top(val);
		return put_user(timeout , (int __user *)arg);

	case WDIOC_GETTIMEOUT:
		return put_user(dw_wdt_get_top(), (int __user *)arg);

	case WDIOC_GETTIMELEFT:
		
		if (get_user(val, (int __user *)arg))
			return -EFAULT;
		return put_user(dw_wdt_time_left(), (int __user *)arg);

	default:
		return -ENOTTY;
	}
}
Example #9
0
static int dw_wdt_drv_probe(struct platform_device *pdev)
{
    int ret;
    struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);

    if (!mem)
        return -EINVAL;

    dw_wdt.regs = devm_ioremap_resource(&pdev->dev, mem);
    if (IS_ERR(dw_wdt.regs))
        return PTR_ERR(dw_wdt.regs);

    dw_wdt.clk = devm_clk_get(&pdev->dev, NULL);
    if (IS_ERR(dw_wdt.clk))
        return PTR_ERR(dw_wdt.clk);

    ret = clk_prepare_enable(dw_wdt.clk);
    if (ret)
        return ret;

    spin_lock_init(&dw_wdt.lock);

    ret = misc_register(&dw_wdt_miscdev);
    if (ret)
        goto out_disable_clk;

    dw_wdt_set_next_heartbeat();
    setup_timer(&dw_wdt.timer, dw_wdt_ping, 0);
    mod_timer(&dw_wdt.timer, jiffies + WDT_TIMEOUT);

    return 0;

out_disable_clk:
    clk_disable_unprepare(dw_wdt.clk);

    return ret;
}