1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * delay.h: Linux delay routines on the Sparc.
4  *
5  * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu).
6  */
7 
8 #ifndef __SPARC_DELAY_H
9 #define __SPARC_DELAY_H
10 
11 #include <asm/cpudata.h>
12 
__delay(unsigned long loops)13 static inline void __delay(unsigned long loops)
14 {
15 	__asm__ __volatile__("cmp %0, 0\n\t"
16 			     "1: bne 1b\n\t"
17 			     "subcc %0, 1, %0\n" :
18 			     "=&r" (loops) :
19 			     "0" (loops) :
20 			     "cc");
21 }
22 
23 /* This is too messy with inline asm on the Sparc. */
24 void __udelay(unsigned long usecs, unsigned long lpj);
25 void __ndelay(unsigned long nsecs, unsigned long lpj);
26 
27 #ifdef CONFIG_SMP
28 #define __udelay_val	cpu_data(smp_processor_id()).udelay_val
29 #else /* SMP */
30 #define __udelay_val	loops_per_jiffy
31 #endif /* SMP */
32 #define udelay(__usecs)	__udelay(__usecs, __udelay_val)
33 #define ndelay(__nsecs)	__ndelay(__nsecs, __udelay_val)
34 
35 #endif /* defined(__SPARC_DELAY_H) */
36