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Simplify delay loop by moving the maths to before the loop.

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There is minimal risk of overflow unless something delays >134s.
This commit is contained in:
chris 2006-04-17 00:03:17 +00:00
parent c75aeaa653
commit 35c6b9f8a4
1 changed files with 6 additions and 11 deletions
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17
sys/arch/arm/footbridge/footbridge_clock.c
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@ -1,4 +1,4 @@
/* $NetBSD: footbridge_clock.c,v 1.20 2005/12/11 12:16:45 christos Exp $ */
/* $NetBSD: footbridge_clock.c,v 1.21 2006/04/17 00:03:17 chris Exp $ */
/*
* Copyright (c) 1997 Mark Brinicombe.
@ -35,7 +35,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: footbridge_clock.c,v 1.20 2005/12/11 12:16:45 christos Exp $");
__KERNEL_RCSID(0, "$NetBSD: footbridge_clock.c,v 1.21 2006/04/17 00:03:17 chris Exp $");
/* Include header files */
@ -421,7 +421,6 @@ delay(n)
if (n == 0) return;
/*
* not calibrated the timer yet, so try to live with this horrible
* loop!
@ -440,9 +439,11 @@ delay(n)
last = bus_space_read_4(clock_sc->sc_iot, clock_sc->sc_ioh,
TIMER_3_VALUE);
delta = usecs = 0;
delta = 0;
while (n > usecs)
usecs = n * delay_count_per_usec;
while (usecs > delta)
{
cur = bus_space_read_4(clock_sc->sc_iot, clock_sc->sc_ioh,
TIMER_3_VALUE);
@ -463,12 +464,6 @@ delay(n)
TIMER_3_CLEAR, 0);
}
last = cur;
if (delta >= delay_count_per_usec)
{
usecs += delta / delay_count_per_usec;
delta %= delay_count_per_usec;
}
}
}