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 
__delay(unsigned long loops)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 
__const_udelay(unsigned long xloops)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" (current_cpu_data.loops_per_jiffy)
28 		: "macl", "mach");
29 	__delay(xloops * HZ);
30 }
31 
__udelay(unsigned long usecs)32 void __udelay(unsigned long usecs)
33 {
34 	__const_udelay(usecs * 0x000010c6);  /* 2**32 / 1000000 */
35 }
36 
__ndelay(unsigned long nsecs)37 void __ndelay(unsigned long nsecs)
38 {
39 	__const_udelay(nsecs * 5);  /* 2**32 / 1000000000 (rounded up) */
40 }
41