blob: f9200a65c632b9421d02b16106feded2eb3eb4eb [file] [log] [blame]
Paul Mackerrasc55377e2005-11-14 17:22:01 +11001#ifndef _ASM_POWERPC_DELAY_H
2#define _ASM_POWERPC_DELAY_H
Arnd Bergmann88ced032005-12-16 22:43:46 +01003#ifdef __KERNEL__
Linus Torvalds1da177e2005-04-16 15:20:36 -07004
5/*
6 * Copyright 1996, Paul Mackerras.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 *
13 * PPC64 Support added by Dave Engebretsen, Todd Inglett, Mike Corrigan,
14 * Anton Blanchard.
15 */
16
Paul Mackerras6defa382005-11-18 13:44:17 +110017extern void __delay(unsigned long loops);
18extern void udelay(unsigned long usecs);
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
Anton Blanchard1e92a552006-06-15 14:11:22 +100020/*
21 * On shared processor machines the generic implementation of mdelay can
22 * result in large errors. While each iteration of the loop inside mdelay
23 * is supposed to take 1ms, the hypervisor could sleep our partition for
24 * longer (eg 10ms). With the right timing these errors can add up.
25 *
26 * Since there is no 32bit overflow issue on 64bit kernels, just call
27 * udelay directly.
28 */
29#ifdef CONFIG_PPC64
30#define mdelay(n) udelay((n) * 1000)
31#endif
32
Arnd Bergmann88ced032005-12-16 22:43:46 +010033#endif /* __KERNEL__ */
Paul Mackerrasc55377e2005-11-14 17:22:01 +110034#endif /* _ASM_POWERPC_DELAY_H */