diff options
Diffstat (limited to 'arch/powerpc/include/asm/delay.h')
-rw-r--r-- | arch/powerpc/include/asm/delay.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/delay.h b/arch/powerpc/include/asm/delay.h new file mode 100644 index 00000000000..f9200a65c63 --- /dev/null +++ b/arch/powerpc/include/asm/delay.h | |||
@@ -0,0 +1,34 @@ | |||
1 | #ifndef _ASM_POWERPC_DELAY_H | ||
2 | #define _ASM_POWERPC_DELAY_H | ||
3 | #ifdef __KERNEL__ | ||
4 | |||
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 | |||
17 | extern void __delay(unsigned long loops); | ||
18 | extern void udelay(unsigned long usecs); | ||
19 | |||
20 | /* | ||
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 | |||
33 | #endif /* __KERNEL__ */ | ||
34 | #endif /* _ASM_POWERPC_DELAY_H */ | ||