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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/s3c44b0/interrupts.c
parent50712ba16e7e469e90952a7f197efa46e2f8e311 (diff)
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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/s3c44b0/interrupts.c')
-rw-r--r--cpu/s3c44b0/interrupts.c23
1 files changed, 15 insertions, 8 deletions
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 @@ ulong get_timer_masked (void)
void udelay_masked (unsigned long usec)
{
ulong tmo;
+ ulong endtime;
+ signed long diff;
- tmo = usec / 1000;
- tmo *= CFG_HZ;
- tmo /= 8;
-
- tmo += get_timer (0);
+ if (usec >= 1000) {
+ tmo = usec / 1000;
+ tmo *= CFG_HZ;
+ tmo /= 8;
+ } else {
+ tmo = usec * CFG_HZ;
+ tmo /= (1000*8);
+ }
- reset_timer_masked ();
+ endtime = get_timer(0) + tmo;
- while (get_timer_masked () < tmo)
- /*NOP*/;
+ do {
+ ulong now = get_timer_masked ();
+ diff = endtime - now;
+ } while (diff >= 0);
}