aspeed: watchdog: Set bootstatus during probe

Check the aspeed timeout status register to see if the system has booted
from the secondary boot source. If so, set the watchdog device
bootstatus flag for "Card previously reset the CPU."

Signed-off-by: Eddie James <eajames@linux.vnet.ibm.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c
index a5b8eb2..1abe4d0 100644 (file)
--- a/drivers/watchdog/aspeed_wdt.c
+++ b/drivers/watchdog/aspeed_wdt.c
@@ -55,6 +55,8 @@ MODULE_DEVICE_TABLE(of, aspeed_wdt_of_table);
 #define   WDT_CTRL_WDT_INTR            BIT(2)
 #define   WDT_CTRL_RESET_SYSTEM                BIT(1)
 #define   WDT_CTRL_ENABLE              BIT(0)
+#define WDT_TIMEOUT_STATUS     0x10
+#define   WDT_TIMEOUT_STATUS_BOOT_SECONDARY    BIT(1)
 
 /*
  * WDT_RESET_WIDTH controls the characteristics of the external pulse (if
@@ -192,6 +194,7 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
        struct device_node *np;
        const char *reset_type;
        u32 duration;
+       u32 status;
        int ret;
 
        wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
@@ -307,6 +310,10 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
                writel(duration - 1, wdt->base + WDT_RESET_WIDTH);
        }
 
+       status = readl(wdt->base + WDT_TIMEOUT_STATUS);
+       if (status & WDT_TIMEOUT_STATUS_BOOT_SECONDARY)
+               wdt->wdd.bootstatus = WDIOF_CARDRESET;
+
        ret = devm_watchdog_register_device(&pdev->dev, &wdt->wdd);
        if (ret) {
                dev_err(&pdev->dev, "failed to register\n");