44 lines
974 B
C
44 lines
974 B
C
|
#ifndef _PARISC_DELAY_H
|
||
|
|
#define _PARISC_DELAY_H
|
||
|
|
|
||
|
|
#include <asm/system.h> /* for mfctl() */
|
||
|
|
#include <asm/processor.h> /* for boot_cpu_data */
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Copyright (C) 1993 Linus Torvalds
|
||
|
|
*
|
||
|
|
* Delay routines
|
||
|
|
*/
|
||
|
|
|
||
|
|
static __inline__ void __delay(unsigned long loops) {
|
||
|
|
asm volatile(
|
||
|
|
" .balignl 64,0x34000034\n"
|
||
|
|
" addib,UV -1,%0,.\n"
|
||
|
|
" nop\n"
|
||
|
|
: "=r" (loops) : "0" (loops));
|
||
|
|
}
|
||
|
|
|
||
|
|
static __inline__ void __cr16_delay(unsigned long clocks) {
|
||
|
|
unsigned long start;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Note: Due to unsigned math, cr16 rollovers shouldn't be
|
||
|
|
* a problem here. However, on 32 bit, we need to make sure
|
||
|
|
* we don't pass in too big a value. The current default
|
||
|
|
* value of MAX_UDELAY_MS should help prevent this.
|
||
|
|
*/
|
||
|
|
|
||
|
|
start = mfctl(16);
|
||
|
|
while ((mfctl(16) - start) < clocks)
|
||
|
|
;
|
||
|
|
}
|
||
|
|
|
||
|
|
static __inline__ void __udelay(unsigned long usecs) {
|
||
|
|
__cr16_delay(usecs * ((unsigned long)boot_cpu_data.cpu_hz / 1000000UL));
|
||
|
|
}
|
||
|
|
|
||
|
|
#define udelay(n) __udelay(n)
|
||
|
|
|
||
|
|
#endif /* defined(_PARISC_DELAY_H) */
|