diff options
Diffstat (limited to 'cpu/arm720t')
| -rw-r--r-- | cpu/arm720t/interrupts.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/cpu/arm720t/interrupts.c b/cpu/arm720t/interrupts.c index a7ea70a..ab28e60 100644 --- a/cpu/arm720t/interrupts.c +++ b/cpu/arm720t/interrupts.c @@ -358,15 +358,24 @@ 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 /= 1000; + if (usec >= 1000) { + tmo = usec / 1000; + tmo *= CFG_HZ; + tmo /= 1000; + } else { + tmo = usec * CFG_HZ; + 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); } #elif defined(CONFIG_S3C4510B) |