1 /* 2 * Precise Delay Loops for SuperH 3 * 4 * Copyright (C) 1999 Niibe Yutaka & Kaz Kojima 5 */ 6 7 #include <linux/sched.h> 8 #include <linux/delay.h> 9 10 void __delay(unsigned long loops) 11 { 12 __asm__ __volatile__( 13 "tst %0, %0\n\t" 14 "1:\t" 15 "bf/s 1b\n\t" 16 " dt %0" 17 : "=r" (loops) 18 : "0" (loops) 19 : "t"); 20 } 21 22 inline void __const_udelay(unsigned long xloops) 23 { 24 xloops *= 4; 25 __asm__("dmulu.l %0, %2\n\t" 26 "sts mach, %0" 27 : "=r" (xloops) 28 : "0" (xloops), 29 "r" (cpu_data[raw_smp_processor_id()].loops_per_jiffy * (HZ/4)) 30 : "macl", "mach"); 31 __delay(++xloops); 32 } 33 34 void __udelay(unsigned long usecs) 35 { 36 __const_udelay(usecs * 0x000010c6); /* 2**32 / 1000000 */ 37 } 38 39 void __ndelay(unsigned long nsecs) 40 { 41 __const_udelay(nsecs * 0x00000005); 42 } 43 44