2 * include/asm-xtensa/delay.h
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
8 * Copyright (C) 2001 - 2005 Tensilica Inc.
12 #ifndef _XTENSA_DELAY_H
13 #define _XTENSA_DELAY_H
15 #include <asm/timex.h>
16 #include <asm/param.h>
18 extern unsigned long loops_per_jiffy;
20 static inline void __delay(unsigned long loops)
22 if (__builtin_constant_p(loops) && loops < 2)
23 __asm__ __volatile__ ("nop");
25 /* 2 cycles per loop. */
26 __asm__ __volatile__ ("1: addi %0, %0, -2; bgeui %0, 2, 1b"
30 /* For SMP/NUMA systems, change boot_cpu_data to something like
31 * local_cpu_data->... where local_cpu_data points to the current
34 static __inline__ void udelay (unsigned long usecs)
36 unsigned long start = get_ccount();
37 unsigned long cycles = usecs * (loops_per_jiffy / (1000000UL / HZ));
39 /* Note: all variables are unsigned (can wrap around)! */
40 while (((unsigned long)get_ccount()) - start < cycles)