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 __asm__("dmulu.l %0, %2\n\t" 25 "sts mach, %0" 26 : "=r" (xloops) 27 : "0" (xloops), "r" (cpu_data[raw_smp_processor_id()].loops_per_jiffy) 28 : "macl", "mach"); 29 __delay(xloops * HZ); 30 } 31 32 void __udelay(unsigned long usecs) 33 { 34 __const_udelay(usecs * 0x000010c6); /* 2**32 / 1000000 */ 35 } 36 37 void __ndelay(unsigned long nsecs) 38 { 39 __const_udelay(nsecs * 0x00000005); 40 } 41 42