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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/arm920t
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/arm920t')
-rw-r--r--cpu/arm920t/imx/interrupts.c9
-rw-r--r--cpu/arm920t/s3c24x0/interrupts.c21
2 files changed, 21 insertions, 9 deletions
diff --git a/cpu/arm920t/imx/interrupts.c b/cpu/arm920t/imx/interrupts.c
index 12ae2fa..2f2e754 100644
--- a/cpu/arm920t/imx/interrupts.c
+++ b/cpu/arm920t/imx/interrupts.c
@@ -81,10 +81,13 @@ ulong get_timer_masked (void)
void udelay_masked (unsigned long usec)
{
- ulong start = get_timer_masked();
+ ulong endtime = get_timer_masked() + usec;
+ signed long diff;
- while (get_timer_masked () - start < usec )
- /*NOP*/;
+ do {
+ ulong now = get_timer_masked ();
+ diff = endtime - now;
+ } while (diff >= 0);
}
void udelay (unsigned long usec)
diff --git a/cpu/arm920t/s3c24x0/interrupts.c b/cpu/arm920t/s3c24x0/interrupts.c
index f581d6d..868621f 100644
--- a/cpu/arm920t/s3c24x0/interrupts.c
+++ b/cpu/arm920t/s3c24x0/interrupts.c
@@ -137,15 +137,24 @@ ulong get_timer_masked (void)
void udelay_masked (unsigned long usec)
{
ulong tmo;
+ ulong endtime;
+ signed long diff;
- tmo = usec / 1000;
- tmo *= (timer_load_val * 100);
- tmo /= 1000;
+ if (usec >= 1000) {
+ tmo = usec / 1000;
+ tmo *= (timer_load_val * 100);
+ tmo /= 1000;
+ } else {
+ tmo = usec * (timer_load_val * 100);
+ tmo /= (1000*1000);
+ }
- reset_timer_masked ();
+ endtime = get_timer_masked () + tmo;
- while (get_timer_masked () < tmo)
- /*NOP*/;
+ do {
+ ulong now = get_timer_masked ();
+ diff = endtime - now;
+ } while (diff >= 0);
}
/*