Fix timer code for ARM systems: make sure that udelay() does not
reset timers so it's save to use udelay() in timeout code.
diff --git a/cpu/s3c44b0/interrupts.c b/cpu/s3c44b0/interrupts.c
index dea8118..5d2c13d 100644
--- a/cpu/s3c44b0/interrupts.c
+++ b/cpu/s3c44b0/interrupts.c
@@ -219,15 +219,22 @@
void udelay_masked (unsigned long usec)
{
ulong tmo;
+ ulong endtime;
+ signed long diff;
- tmo = usec / 1000;
- tmo *= CFG_HZ;
- tmo /= 8;
+ if (usec >= 1000) {
+ tmo = usec / 1000;
+ tmo *= CFG_HZ;
+ tmo /= 8;
+ } else {
+ tmo = usec * CFG_HZ;
+ tmo /= (1000*8);
+ }
- tmo += get_timer (0);
+ endtime = get_timer(0) + tmo;
- reset_timer_masked ();
-
- while (get_timer_masked () < tmo)
- /*NOP*/;
+ do {
+ ulong now = get_timer_masked ();
+ diff = endtime - now;
+ } while (diff >= 0);
}
