projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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) */ |