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5fd861b682
s390 has fast read access to realtime clock (nanosecond resolution). So it makes sense to have an arch-specific implementation not only of __delay, but __udelay also. Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
33 lines
523 B
C
33 lines
523 B
C
#include "linux/delay.h"
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#include "asm/param.h"
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void __delay(unsigned long time)
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{
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/* Stolen from the i386 __loop_delay */
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int d0;
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__asm__ __volatile__(
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"\tjmp 1f\n"
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".align 16\n"
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"1:\tjmp 2f\n"
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".align 16\n"
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"2:\tdecl %0\n\tjns 2b"
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:"=&a" (d0)
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:"0" (time));
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}
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void __udelay(unsigned long usecs)
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{
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int i, n;
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n = (loops_per_jiffy * HZ * usecs) / MILLION;
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for(i=0;i<n;i++) ;
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}
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void __const_udelay(unsigned long usecs)
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{
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int i, n;
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n = (loops_per_jiffy * HZ * usecs) / MILLION;
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for(i=0;i<n;i++) ;
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}
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