include/asm/delay.h

0001 /*
0002  * This file is subject to the terms and conditions of the GNU General Public
0003  * License.  See the file "COPYING" in the main directory of this archive
0004  * for more details.
0005  *
0006  * Copyright (C) 1994 by Waldorf Electronics
0007  * Copyright (C) 1995 - 2000, 01, 03 by Ralf Baechle
0008  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
0009  * Copyright (C) 2007  Maciej W. Rozycki
0010  */
0011 #ifndef _ASM_DELAY_H
0012 #define _ASM_DELAY_H
0013
0014 #include <linux/param.h>
0015
0016 extern void __delay(unsigned long loops);
0017 extern void __ndelay(unsigned long ns);
0018 extern void __udelay(unsigned long us);
0019
0020 #define ndelay(ns) __ndelay(ns)
0021 #define udelay(us) __udelay(us)
0022
0023 /* make sure "usecs *= ..." in udelay do not overflow. */
0024 #if HZ >= 1000
0025 #define MAX_UDELAY_MS   1
0026 #elif HZ <= 200
0027 #define MAX_UDELAY_MS   5
0028 #else
0029 #define MAX_UDELAY_MS   (1000 / HZ)
0030 #endif
0031
0032 #endif /* _ASM_DELAY_H */