X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=drivers%2Frtc%2Frtc-mv.c;h=e0263d2005eeba6beb78c73809bae192f9c40bfb;hb=ed40d0c472b136682b2fcba05f89762859c7374f;hp=45f12dcd37160986e014345018f065f9cc75c6fb;hpb=4b48d9d44ebe0e8c31b4fe3b7480941576fff613;p=linux-2.6-omap-h63xx.git

diff --git a/drivers/rtc/rtc-mv.c b/drivers/rtc/rtc-mv.c
index 45f12dcd371..e0263d2005e 100644
--- a/drivers/rtc/rtc-mv.c
+++ b/drivers/rtc/rtc-mv.c
@@ -12,6 +12,7 @@
 #include <linux/bcd.h>
 #include <linux/io.h>
 #include <linux/platform_device.h>
+#include <linux/delay.h>
 
 
 #define RTC_TIME_REG_OFFS	0
@@ -119,6 +120,16 @@ static int __init mv_rtc_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	/* make sure it is actually functional */
+	if (rtc_time == 0x01000000) {
+		ssleep(1);
+		rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
+		if (rtc_time == 0x01000000) {
+			dev_err(&pdev->dev, "internal RTC not ticking\n");
+			return -ENODEV;
+		}
+	}
+
 	platform_set_drvdata(pdev, pdata);
 	pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
 					 &mv_rtc_ops, THIS_MODULE);