static inline void ath79_wdt_enable(void)
{
ath79_wdt_keepalive();
ath79_wdt_wr(WDOG_REG_CTRL, WDOG_CTRL_ACTION_FCR);
/* flush write */
ath79_wdt_rr(WDOG_REG_CTRL);
}
static int ath79_wdt_probe(struct platform_device *pdev)
{
struct resource *res;
u32 ctrl;
int err;
if (wdt_base)
return -EBUSY;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
wdt_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(wdt_base))
return PTR_ERR(wdt_base);
wdt_clk = devm_clk_get(&pdev->dev, "wdt");
if (IS_ERR(wdt_clk))
return PTR_ERR(wdt_clk);
err = clk_enable(wdt_clk);
if (err)
return err;
wdt_freq = clk_get_rate(wdt_clk);
if (!wdt_freq) {
err = -EINVAL;
goto err_clk_disable;
}
max_timeout = (0xfffffffful / wdt_freq);
if (timeout < 1 || timeout > max_timeout) {
timeout = max_timeout;
dev_info(&pdev->dev,
"timeout value must be 0 < timeout < %d, using %d\n",
max_timeout, timeout);
}
ctrl = ath79_wdt_rr(WDOG_REG_CTRL);
boot_status = (ctrl & WDOG_CTRL_LAST_RESET) ? WDIOF_CARDRESET : 0;
err = misc_register(&ath79_wdt_miscdev);
if (err) {
dev_err(&pdev->dev,
"unable to register misc device, err=%d\n", err);
goto err_clk_disable;
}
return 0;
err_clk_disable:
clk_disable(wdt_clk);
return err;
}
static inline void ath79_wdt_enable(void)
{
ath79_wdt_keepalive();
/*
* Updating the TIMER register requires a few microseconds
* on the AR934x SoCs at least. Use a small delay to ensure
* that the TIMER register is updated within the hardware
* before enabling the watchdog.
*/
udelay(2);
ath79_wdt_wr(WDOG_REG_CTRL, WDOG_CTRL_ACTION_FCR);
/* flush write */
ath79_wdt_rr(WDOG_REG_CTRL);
}
static inline void ath79_wdt_disable(void)
{
ath79_wdt_wr(WDOG_REG_CTRL, WDOG_CTRL_ACTION_NONE);
/* flush write */
ath79_wdt_rr(WDOG_REG_CTRL);
}
static inline void ath79_wdt_keepalive(void)
{
ath79_wdt_wr(WDOG_REG_TIMER, wdt_freq * timeout);
/* flush write */
ath79_wdt_rr(WDOG_REG_TIMER);
}