1 #ifndef _PARISC_DELAY_H 2 #define _PARISC_DELAY_H 3 4 #include <asm/special_insns.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) */ 44