rtc: rtc-s3c: Updates driver for S3C64XX and newer SoCs

This Patch does followings.
1) Enables support for alarm and time tick pending register
   for periodic interrupt generation.
2) Changes writeb to writew beacuse the macro S3C64XX_RTCCON_TICEN
   (Tick Timer Enable) is 9th bit of register.
3) Changes writeb to writel as max_user_freq used in s3c64xx is 32768 and
   requires 15 bits to update the Tick Count Register.
Signed-off-by: Atul Dahiya <atul.dahiya@samsung.com>
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>

drivers/rtc/rtc-s3c.c

@@ -57,6 +57,10 @@ static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
 	struct rtc_device *rdev = id;
 
 	rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
+
+	if (s3c_rtc_cpu_type == TYPE_S3C64XX)
+		writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
+
 	return IRQ_HANDLED;
 }
 
@@ -65,6 +69,10 @@ static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
 	struct rtc_device *rdev = id;
 
 	rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
+
+	if (s3c_rtc_cpu_type == TYPE_S3C64XX)
+		writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
+
 	return IRQ_HANDLED;
 }
 
@@ -98,7 +106,7 @@ static int s3c_rtc_setpie(struct device *dev, int enabled)
 		if (enabled)
 			tmp |= S3C64XX_RTCCON_TICEN;
 
-		writeb(tmp, s3c_rtc_base + S3C2410_RTCCON);
+		writew(tmp, s3c_rtc_base + S3C2410_RTCCON);
 	} else {
 		tmp = readb(s3c_rtc_base + S3C2410_TICNT);
 		tmp &= ~S3C2410_TICNT_ENABLE;
@@ -132,7 +140,7 @@ static int s3c_rtc_setfreq(struct device *dev, int freq)
 
 	tmp |= (rtc_dev->max_user_freq / freq)-1;
 
-	writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
+	writel(tmp, s3c_rtc_base + S3C2410_TICNT);
 	spin_unlock_irq(&s3c_rtc_pie_lock);
 
 	return 0;