[ARM] S3C24XX: Split timer pending code out

Split the timer pending code out to a seperate per-machine
header so that when compiling for mach-s3c2410 or mach-s3c24a0
we can use the right timer code without having to #ifdef the
timer driver.
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

arch/arm/mach-s3c2410/include/mach/tick.h

+/* linux/arch/arm/mach-s3c2410/include/mach/tick.h
+ *
+ * Copyright 2008 Simtec Electronics
+ *      Ben Dooks <ben@simtec.co.uk>
+ *      http://armlinux.simtec.co.uk/
+ *
+ * S3C2410 - timer tick support
+ */
+
+#define SRCPND_TIMER4 (1<<(IRQ_TIMER4 - IRQ_EINT0))
+
+static inline int s3c24xx_ostimer_pending(void)
+{
+	return __raw_readl(S3C2410_SRCPND) & SRCPND_TIMER4;
+}

arch/arm/mach-s3c24a0/include/mach/tick.h

+/* linux/arch/arm/mach-s3c24a0/include/mach/tick.h
+ *
+ * Copyright 2008 Simtec Electronics
+ *      Ben Dooks <ben@simtec.co.uk>
+ *      http://armlinux.simtec.co.uk/
+ *
+ * S3C24A0 - timer tick support
+ */
+
+#define SUBSRC_TIMER4	(1 << (IRQ_TIMER4 - IRQ_S3CUART_RX0))
+
+static inline int s3c24xx_ostimer_pending(void)
+{
+	return __raw_readl(S3C2410_SUBSRCPND) & SUBSRC_TIMER4;
+}

arch/arm/plat-s3c/time.c

@@ -36,6 +36,7 @@
 #include <plat/regs-timer.h>
 #include <mach/regs-irq.h>
 #include <asm/mach/time.h>
+#include <mach/tick.h>
 
 #include <plat/clock.h>
 #include <plat/cpu.h>
@@ -91,12 +92,9 @@ static inline unsigned long timer_ticks_to_usec(unsigned long ticks)
  * IRQs are disabled before entering here from do_gettimeofday()
  */
 
-#define SRCPND_TIMER4 (1<<(IRQ_TIMER4 - IRQ_EINT0))
-
 static unsigned long s3c2410_gettimeoffset (void)
 {
 	unsigned long tdone;
-	unsigned long irqpend;
 	unsigned long tval;
 
 	/* work out how many ticks have gone since last timer interrupt */
@@ -106,8 +104,7 @@ static unsigned long s3c2410_gettimeoffset (void)
 
 	/* check to see if there is an interrupt pending */
 
-	irqpend = __raw_readl(S3C2410_SRCPND);
-	if (irqpend & SRCPND_TIMER4) {
+	if (s3c24xx_ostimer_pending()) {
 		/* re-read the timer, and try and fix up for the missed
 		 * interrupt. Note, the interrupt may go off before the
 		 * timer has re-loaded from wrapping.