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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/arm925t
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/arm925t')
-rw-r--r--cpu/arm925t/interrupts.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/cpu/arm925t/interrupts.c b/cpu/arm925t/interrupts.c
index ea4aa3b..57bb4ea 100644
--- a/cpu/arm925t/interrupts.c
+++ b/cpu/arm925t/interrupts.c
@@ -275,20 +275,24 @@ void udelay_masked (unsigned long usec)
#else
ulong tmo;
+ ulong endtime;
+ signed long diff;
- if(usec >= 1000){ /* if "big" number, spread normalization to seconds */
+ if (usec >= 1000) { /* if "big" number, spread normalization to seconds */
tmo = usec / 1000; /* start to normalize for usec to ticks per sec */
tmo *= CFG_HZ; /* find number of "ticks" to wait to achieve target */
tmo /= 1000; /* finish normalize. */
- }else{ /* else small number, don't kill it prior to HZ multiply */
+ } else { /* else small number, don't kill it prior to HZ multiply */
tmo = usec * CFG_HZ;
tmo /= (1000*1000);
}
- reset_timer_masked (); /* set "advancing" timestamp to 0, set lastdec vaule */
+ endtime = get_timer_masked () + tmo;
- while (get_timer_masked () < tmo) /* wait for time stamp to overtake tick number.*/
- /*NOP*/;
+ do {
+ ulong now = get_timer_masked ();
+ diff = endtime - now;
+ } while (diff >= 0);
#endif
}