1/* $Id: delay.h,v 1.1.1.1 2008/10/15 03:27:26 james26_jang Exp $ 2 * delay.h: Linux delay routines on the V9. 3 * 4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu). 5 */ 6 7#ifndef __SPARC64_DELAY_H 8#define __SPARC64_DELAY_H 9 10#include <linux/config.h> 11#include <linux/param.h> 12 13#ifndef __ASSEMBLY__ 14 15#ifdef CONFIG_SMP 16#include <asm/smp.h> 17#else 18extern unsigned long loops_per_jiffy; 19#endif 20 21extern __inline__ void __delay(unsigned long loops) 22{ 23 __asm__ __volatile__( 24" b,pt %%xcc, 1f\n" 25" cmp %0, 0\n" 26" .align 32\n" 27"1:\n" 28" bne,pt %%xcc, 1b\n" 29" subcc %0, 1, %0\n" 30 : "=&r" (loops) 31 : "0" (loops) 32 : "cc"); 33} 34 35extern __inline__ void __udelay(unsigned long usecs, unsigned long lps) 36{ 37 usecs *= 0x00000000000010c6UL; /* 2**32 / 1000000 */ 38 39 __asm__ __volatile__( 40" mulx %1, %2, %0\n" 41" srlx %0, 32, %0\n" 42 : "=r" (usecs) 43 : "r" (usecs), "r" (lps)); 44 45 __delay(usecs * HZ); 46} 47 48#ifdef CONFIG_SMP 49#define __udelay_val cpu_data[smp_processor_id()].udelay_val 50#else 51#define __udelay_val loops_per_jiffy 52#endif 53 54#define udelay(usecs) __udelay((usecs),__udelay_val) 55 56#endif /* !__ASSEMBLY__ */ 57 58#endif /* defined(__SPARC64_DELAY_H) */ 59