rtc: rtc-s3c: Add BCD register initialization codes
Taekgyun Ko [Thu, 29 Jul 2010 04:00:42 +0000 (13:00 +0900)]
RTC needs to be initialized when BCD registers have invalid value.

Signed-off-by: Taekgyun Ko <taeggyun.ko@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Cc: Ben Dooks <ben-linux@fluff.org>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>

drivers/rtc/rtc-s3c.c

index 2040017..a0d3ec8 100644 (file)
@@ -458,6 +458,7 @@ static int __devinit s3c_rtc_probe(struct platform_device *pdev)
 {
        struct rtc_device *rtc;
        struct resource *res;
+       unsigned int tmp, i;
        int ret;
 
        pr_debug("%s: probe=%p\n", __func__, pdev);
@@ -536,6 +537,15 @@ static int __devinit s3c_rtc_probe(struct platform_device *pdev)
 
        s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;
 
+       /* Check RTC Time */
+
+       for (i = S3C2410_RTCSEC; i <= S3C2410_RTCYEAR; i += 0x4) {
+               tmp = readb(s3c_rtc_base + i);
+
+               if ((tmp & 0xf) > 0x9 || ((tmp >> 4) & 0xf) > 0x9)
+                       writeb(0, s3c_rtc_base + i);
+       }
+
        if (s3c_rtc_cpu_type == TYPE_S3C64XX)
                rtc->max_user_freq = 32768;
        else