Merge remote branch 'origin/master' into next

1 files changed, 13 insertions, 18 deletions

diff --git a/cpu/arm920t/ep93xx/timer.c b/cpu/arm920t/ep93xx/timer.c
index b1a01a05e9..31304b7f97 100644
--- a/cpu/arm920t/ep93xx/timer.c
+++ b/cpu/arm920t/ep93xx/timer.c
@@ -36,7 +36,7 @@
 #define TIMER_CLKSEL	(1 << 3)
 #define TIMER_ENABLE	(1 << 7)
 
-#define TIMER_FREQ			508469
+#define TIMER_FREQ			508469		/* ticks / second */
 #define TIMER_MAX_VAL			0xFFFFFFFF
 
 static struct ep93xx_timer
@@ -53,18 +53,10 @@ static inline unsigned long clk_to_systicks(unsigned long long clk_ticks)
 	return (unsigned long)sys_ticks;
 }
 
-static inline unsigned long usecs_to_ticks(unsigned long usecs)
+static inline unsigned long long usecs_to_ticks(unsigned long usecs)
 {
-	unsigned long ticks;
-
-	if (usecs >= 1000) {
-		ticks = usecs / 1000;
-		ticks *= TIMER_FREQ;
-		ticks /= 1000;
-	} else {
-		ticks = usecs * TIMER_FREQ;
-		ticks /= (1000 * 1000);
-	}
+	unsigned long long ticks = (unsigned long long)usecs * TIMER_FREQ;
+	do_div(ticks, 1000 * 1000);
 
 	return ticks;
 }
@@ -77,7 +69,7 @@ static inline unsigned long read_timer(void)
 }
 
 /*
- * timer without interrupts
+ * Get the number of ticks (in CONFIG_SYS_HZ resolution)
  */
 unsigned long long get_ticks(void)
 {
@@ -91,12 +83,12 @@ unsigned long long get_ticks(void)
 
 	timer.last_update = now;
 
-	return timer.ticks;
+	return clk_to_systicks(timer.ticks);
 }
 
 unsigned long get_timer_masked(void)
 {
-	return clk_to_systicks(get_ticks());
+	return get_ticks();
 }
 
 unsigned long get_timer(unsigned long base)
@@ -117,10 +109,13 @@ void reset_timer(void)
 
 void __udelay(unsigned long usec)
 {
-	const unsigned long target = get_ticks() + usecs_to_ticks(usec);
+	/* read the timer and update timer.ticks */
+	get_ticks();
+
+	const unsigned long long target = timer.ticks + usecs_to_ticks(usec);
 
-	while (get_ticks() < target)
-		/* noop */;
+	while (timer.ticks < target)
+		get_ticks();
 }
 
 int timer_init(void)