From: Matthias Kaehlcke <matthias@kaehlcke.net>
Date: Tue, 9 Mar 2010 21:13:33 +0000 (+0100)
Subject: ep93xx timer: Fix resolution of get_ticks()
X-Git-Tag: v2010.09-rc1~1^2~19^2~18^2~2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=dea86bb9aa663d726a6e6c1cf5c464c3ae351da9;p=platform%2Fkernel%2Fu-boot.git

ep93xx timer: Fix resolution of get_ticks()

ep93xx timer: Make get_ticks() return a value in CONFIG_SYS_HZ resolution,
as announced by get_tbclk()

Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>
---

diff --git a/cpu/arm920t/ep93xx/timer.c b/cpu/arm920t/ep93xx/timer.c
index bc4ec8f..31304b7 100644
--- a/cpu/arm920t/ep93xx/timer.c
+++ b/cpu/arm920t/ep93xx/timer.c
@@ -69,7 +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)
 {
@@ -83,12 +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)
@@ -109,10 +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();
 
-	while (get_ticks() < target)
-		/* noop */;
+	const unsigned long long target = timer.ticks + usecs_to_ticks(usec);
+
+	while (timer.ticks < target)
+		get_ticks();
 }
 
 int timer_init(void)