/* | |
* Precise Delay Loops for SuperH | |
* | |
* Copyright (C) 1999 Niibe Yutaka & Kaz Kojima | |
*/ | |
#include <linux/sched.h> | |
#include <linux/delay.h> | |
void __delay(unsigned long loops) | |
{ | |
__asm__ __volatile__( | |
"tst %0, %0\n\t" | |
"1:\t" | |
"bf/s 1b\n\t" | |
" dt %0" | |
: "=r" (loops) | |
: "0" (loops) | |
: "t"); | |
} | |
inline void __const_udelay(unsigned long xloops) | |
{ | |
xloops *= 4; | |
__asm__("dmulu.l %0, %2\n\t" | |
"sts mach, %0" | |
: "=r" (xloops) | |
: "0" (xloops), | |
"r" (cpu_data[raw_smp_processor_id()].loops_per_jiffy * (HZ/4)) | |
: "macl", "mach"); | |
__delay(++xloops); | |
} | |
void __udelay(unsigned long usecs) | |
{ | |
__const_udelay(usecs * 0x000010c6); /* 2**32 / 1000000 */ | |
} | |
void __ndelay(unsigned long nsecs) | |
{ | |
__const_udelay(nsecs * 0x00000005); | |
} | |