rtc: interface: ignore expired timers when enqueuing new timers

[pandora-kernel.git] / drivers / rtc / rtc-s3c.c

diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 4e7c04e..5b979d9 100644 (file)
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -51,6 +51,27 @@ static enum s3c_cpu_type s3c_rtc_cpu_type;
 
 static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
 
+static void s3c_rtc_alarm_clk_enable(bool enable)
+{
+       static DEFINE_SPINLOCK(s3c_rtc_alarm_clk_lock);
+       static bool alarm_clk_enabled;
+       unsigned long irq_flags;
+
+       spin_lock_irqsave(&s3c_rtc_alarm_clk_lock, irq_flags);
+       if (enable) {
+               if (!alarm_clk_enabled) {
+                       clk_enable(rtc_clk);
+                       alarm_clk_enabled = true;
+               }
+       } else {
+               if (alarm_clk_enabled) {
+                       clk_disable(rtc_clk);
+                       alarm_clk_enabled = false;
+               }
+       }
+       spin_unlock_irqrestore(&s3c_rtc_alarm_clk_lock, irq_flags);
+}
+
 /* IRQ Handlers */
 
 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
@@ -64,6 +85,9 @@ static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
                writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
 
        clk_disable(rtc_clk);
+
+       s3c_rtc_alarm_clk_enable(false);
+
        return IRQ_HANDLED;
 }
 
@@ -97,6 +121,8 @@ static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
        writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
        clk_disable(rtc_clk);
 
+       s3c_rtc_alarm_clk_enable(enabled);
+
        return 0;
 }
 
@@ -176,7 +202,6 @@ static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
        void __iomem *base = s3c_rtc_base;
        int year = tm->tm_year - 100;
 
-       clk_enable(rtc_clk);
        pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
                 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
                 tm->tm_hour, tm->tm_min, tm->tm_sec);
@@ -188,6 +213,7 @@ static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
                return -EINVAL;
        }
 
+       clk_enable(rtc_clk);
        writeb(bin2bcd(tm->tm_sec),  base + S3C2410_RTCSEC);
        writeb(bin2bcd(tm->tm_min),  base + S3C2410_RTCMIN);
        writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);