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1da177e4 LT |
1 | #ifndef _PARISC_DELAY_H |
2 | #define _PARISC_DELAY_H | |
3 | ||
4 | #include <asm/system.h> /* for mfctl() */ | |
5 | #include <asm/processor.h> /* for boot_cpu_data */ | |
6 | ||
7 | ||
8 | /* | |
9 | * Copyright (C) 1993 Linus Torvalds | |
10 | * | |
11 | * Delay routines | |
12 | */ | |
13 | ||
14 | static __inline__ void __delay(unsigned long loops) { | |
15 | asm volatile( | |
16 | " .balignl 64,0x34000034\n" | |
17 | " addib,UV -1,%0,.\n" | |
18 | " nop\n" | |
19 | : "=r" (loops) : "0" (loops)); | |
20 | } | |
21 | ||
22 | static __inline__ void __cr16_delay(unsigned long clocks) { | |
23 | unsigned long start; | |
24 | ||
25 | /* | |
26 | * Note: Due to unsigned math, cr16 rollovers shouldn't be | |
27 | * a problem here. However, on 32 bit, we need to make sure | |
28 | * we don't pass in too big a value. The current default | |
29 | * value of MAX_UDELAY_MS should help prevent this. | |
30 | */ | |
31 | ||
32 | start = mfctl(16); | |
33 | while ((mfctl(16) - start) < clocks) | |
34 | ; | |
35 | } | |
36 | ||
37 | static __inline__ void __udelay(unsigned long usecs) { | |
38 | __cr16_delay(usecs * ((unsigned long)boot_cpu_data.cpu_hz / 1000000UL)); | |
39 | } | |
40 | ||
41 | #define udelay(n) __udelay(n) | |
42 | ||
43 | #endif /* defined(_PARISC_DELAY_H) */ |