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authorMatthias Kaehlcke <matthias@kaehlcke.net>2010-03-09 22:13:33 +0100
committertrix <trix@windriver.com>2010-03-22 11:58:28 -0500
commitd650da2dd4af99967aabc43cccbd8f160eb4cea6 (patch)
treeee5b30aa272d6fb1abc65ecd1dae11087d17556a
parent7e67fb5bf27a07d3b8d6b97c76f7195f7d68af58 (diff)
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>
-rw-r--r--cpu/arm920t/ep93xx/timer.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/cpu/arm920t/ep93xx/timer.c b/cpu/arm920t/ep93xx/timer.c
index bc4ec8fcd4..31304b7f97 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)