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authorwdenk <wdenk>2005-04-04 12:08:28 +0000
committerwdenk <wdenk>2005-04-04 12:08:28 +0000
commit101e8dfa2a8b045c6655bf2b3d6fba8d378453cd (patch)
tree1c39acefbaf435ddc2e9f42540eb64ea267cb530 /cpu/arm1136
parent50712ba16e7e469e90952a7f197efa46e2f8e311 (diff)
Fix timer code for ARM systems: make sure that udelay() does not
reset timers so it's save to use udelay() in timeout code.
Diffstat (limited to 'cpu/arm1136')
-rw-r--r--cpu/arm1136/interrupts.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/cpu/arm1136/interrupts.c b/cpu/arm1136/interrupts.c
index c80d9a5d0f..23236dcb0f 100644
--- a/cpu/arm1136/interrupts.c
+++ b/cpu/arm1136/interrupts.c
@@ -254,6 +254,8 @@ ulong get_timer_masked (void)
void udelay_masked (unsigned long usec)
{
ulong tmo;
+ ulong endtime;
+ signed long diff;
if (usec >= 1000) { /* if "big" number, spread normalization to seconds */
tmo = usec / 1000; /* start to normalize for usec to ticks per sec */
@@ -263,9 +265,12 @@ void udelay_masked (unsigned long usec)
tmo = usec * CFG_HZ;
tmo /= (1000*1000);
}
- reset_timer_masked (); /* set "advancing" timestamp to 0, set lastinc vaule */
- while (get_timer_masked () < tmo) /* wait for time stamp to overtake tick number.*/
- /* NOP */;
+ endtime = get_timer_masked () + tmo;
+
+ do {
+ ulong now = get_timer_masked ();
+ diff = endtime - now;
+ } while (diff >= 0);
}
/*