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| author | wdenk <wdenk> | 2005-04-04 12:08:28 +0000 |
|---|---|---|
| committer | wdenk <wdenk> | 2005-04-04 12:08:28 +0000 |
| commit | 101e8dfa2a8b045c6655bf2b3d6fba8d378453cd (patch) | |
| tree | 1c39acefbaf435ddc2e9f42540eb64ea267cb530 /cpu/arm720t | |
| parent | 50712ba16e7e469e90952a7f197efa46e2f8e311 (diff) | |
| download | u-boot-101e8dfa2a8b045c6655bf2b3d6fba8d378453cd.tar.gz u-boot-101e8dfa2a8b045c6655bf2b3d6fba8d378453cd.tar.bz2 u-boot-101e8dfa2a8b045c6655bf2b3d6fba8d378453cd.zip | |
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/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 a7ea70a266..ab28e602c5 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) |