/* * arch/sh/lib64/udelay.c * * Delay routines, using a pre-computed "loops_per_jiffy" value. * * Copyright (C) 2000, 2001 Paolo Alberelli * Copyright (C) 2003, 2004 Paul Mundt * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #include <linux/sched.h> #include <asm/param.h> /* * Use only for very small delays (< 1 msec). * * The active part of our cycle counter is only 32-bits wide, and * we're treating the difference between two marks as signed. On * a 1GHz box, that's about 2 seconds. */ void __delay(unsigned long loops) { long long dummy; __asm__ __volatile__("gettr tr0, %1\n\t" "pta $+4, tr0\n\t" "addi %0, -1, %0\n\t" "bne %0, r63, tr0\n\t" "ptabs %1, tr0\n\t":"=r"(loops), "=r"(dummy) :"0"(loops)); } void __const_udelay(unsigned long xloops) { __delay(xloops * (HZ * cpu_data[raw_smp_processor_id()].loops_per_jiffy)); } void __udelay(unsigned long usecs) { __const_udelay(usecs * 0x000010c6); /* 2**32 / 1000000 */ } void __ndelay(unsigned long nsecs) { __const_udelay(nsecs * 0x00000005); }