blob: 36ad7f62cf6c020fbb20a30baf1ef63814ee8581 [file] [log] [blame]
/*
* Copyright (C) 1993, 2000 Linus Torvalds
*
* Delay routines, using a pre-computed "loops_per_jiffy" value.
*/
#include <linux/config.h>
#include <linux/sched.h>
#include <asm/param.h>
#include <asm/smp.h>
#include <linux/delay.h>
/*
* Use only for very small delays (< 1 msec).
*
* The active part of our cycle counter is only 32-bits wide, and
* we're treating the difference between two marks as signed. On
* a 1GHz box, that's about 2 seconds.
*/
void __delay(int loops)
{
long long dummy;
__asm__ __volatile__("gettr " __t0 ", %1\n\t"
"_pta 4, " __t0 "\n\t"
"addi %0, -1, %0\n\t"
"bne %0, r63, " __t0 "\n\t"
"ptabs %1, " __t0 "\n\t":"=r"(loops),
"=r"(dummy)
:"0"(loops));
}
void __udelay(unsigned long long usecs, unsigned long lpj)
{
usecs *= (((unsigned long long) HZ << 32) / 1000000) * lpj;
__delay((long long) usecs >> 32);
}
void __ndelay(unsigned long long nsecs, unsigned long lpj)
{
nsecs *= (((unsigned long long) HZ << 32) / 1000000000) * lpj;
__delay((long long) nsecs >> 32);
}
void udelay(unsigned long usecs)
{
__udelay(usecs, loops_per_jiffy);
}
void ndelay(unsigned long nsecs)
{
__ndelay(nsecs, loops_per_jiffy);
}