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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/arm1136/interrupts.c | |
| parent | 50712ba16e7e469e90952a7f197efa46e2f8e311 (diff) | |
| download | u-boot-imx-101e8dfa2a8b045c6655bf2b3d6fba8d378453cd.zip u-boot-imx-101e8dfa2a8b045c6655bf2b3d6fba8d378453cd.tar.gz u-boot-imx-101e8dfa2a8b045c6655bf2b3d6fba8d378453cd.tar.bz2 | |
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/arm1136/interrupts.c')
| -rw-r--r-- | cpu/arm1136/interrupts.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/cpu/arm1136/interrupts.c b/cpu/arm1136/interrupts.c index c80d9a5..23236dc 100644 --- a/cpu/arm1136/interrupts.c +++ b/cpu/arm1136/interrupts.c @@ -254,6 +254,8 @@ ulong get_timer_masked (void) void udelay_masked (unsigned long usec) { ulong tmo; + ulong endtime; + signed long diff; if (usec >= 1000) { /* if "big" number, spread normalization to seconds */ tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ @@ -263,9 +265,12 @@ void udelay_masked (unsigned long usec) tmo = usec * CFG_HZ; tmo /= (1000*1000); } - reset_timer_masked (); /* set "advancing" timestamp to 0, set lastinc vaule */ - while (get_timer_masked () < tmo) /* wait for time stamp to overtake tick number.*/ - /* NOP */; + endtime = get_timer_masked () + tmo; + + do { + ulong now = get_timer_masked (); + diff = endtime - now; + } while (diff >= 0); } /* |