1#ifndef _PPC64_DELAY_H 2#define _PPC64_DELAY_H 3 4/* 5 * Copyright 1996, Paul Mackerras. 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 * 12 * PPC64 Support added by Dave Engebretsen, Todd Inglett, Mike Corrigan, 13 * Anton Blanchard. 14 */ 15 16#ifndef __ASSEMBLY__ 17extern unsigned long tb_ticks_per_usec; 18 19/* define these here to prevent circular dependencies */ 20#define __HMT_low() asm volatile("or 1,1,1") 21#define __HMT_medium() asm volatile("or 2,2,2") 22 23static inline unsigned long __get_tb(void) 24{ 25 unsigned long rval; 26 27 asm volatile("mftb %0" : "=r" (rval)); 28 return rval; 29} 30 31static inline void __delay(unsigned long loops) 32{ 33 unsigned long start = __get_tb(); 34 35 while((__get_tb()-start) < loops) 36 __HMT_low(); 37} 38 39static inline void udelay(unsigned long usecs) 40{ 41 unsigned long loops = tb_ticks_per_usec * usecs; 42 43 __delay(loops); 44 __HMT_medium(); 45} 46#endif /* !__ASSEMBLY__ */ 47 48#endif /* _PPC64_DELAY_H */ 49