| #ifndef _PARISC_DELAY_H |
| #define _PARISC_DELAY_H |
| |
| #include <asm/system.h> /* for mfctl() */ |
| #include <asm/processor.h> /* for boot_cpu_data */ |
| |
| |
| /* |
| * Copyright (C) 1993 Linus Torvalds |
| * |
| * Delay routines |
| */ |
| |
| static __inline__ void __delay(unsigned long loops) { |
| asm volatile( |
| " .balignl 64,0x34000034\n" |
| " addib,UV -1,%0,.\n" |
| " nop\n" |
| : "=r" (loops) : "0" (loops)); |
| } |
| |
| static __inline__ void __cr16_delay(unsigned long clocks) { |
| unsigned long start; |
| |
| /* |
| * Note: Due to unsigned math, cr16 rollovers shouldn't be |
| * a problem here. However, on 32 bit, we need to make sure |
| * we don't pass in too big a value. The current default |
| * value of MAX_UDELAY_MS should help prevent this. |
| */ |
| |
| start = mfctl(16); |
| while ((mfctl(16) - start) < clocks) |
| ; |
| } |
| |
| static __inline__ void __udelay(unsigned long usecs) { |
| __cr16_delay(usecs * ((unsigned long)boot_cpu_data.cpu_hz / 1000000UL)); |
| } |
| |
| #define udelay(n) __udelay(n) |
| |
| #endif /* defined(_PARISC_DELAY_H) */ |
