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Fix timer code for ARM systems: make sure that udelay() does not

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reset timers so it's save to use udelay() in timeout code.
This commit is contained in:
wdenk
2005-04-04 12:08:28 +00:00
parent 50712ba16e
commit 101e8dfa2a
14 changed files with 140 additions and 80 deletions
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14
cpu/arm925t/interrupts.c
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@@ -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
}