5 * Copyright 1996, Paul Mackerras.
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.
12 * PPC64 Support added by Dave Engebretsen, Todd Inglett, Mike Corrigan,
17 extern unsigned long tb_ticks_per_usec;
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 #define __barrier() asm volatile("":::"memory")
24 static inline unsigned long __get_tb(void)
28 asm volatile("mftb %0" : "=r" (rval));
32 static inline void __delay(unsigned long loops)
34 unsigned long start = __get_tb();
36 while((__get_tb()-start) < loops)
42 static inline void udelay(unsigned long usecs)
44 unsigned long loops = tb_ticks_per_usec * usecs;
49 static inline void ndelay(unsigned long nsecs)
51 unsigned long loops = (tb_ticks_per_usec * nsecs) / 1000;
55 #endif /* !__ASSEMBLY__ */
57 #endif /* _PPC64_DELAY_H */