mirror of https://gitee.com/openkylin/linux.git
49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
|
#ifndef _PPC64_DELAY_H
|
||
|
|
#define _PPC64_DELAY_H
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Copyright 1996, Paul Mackerras.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU General Public License
|
||
|
|
* as published by the Free Software Foundation; either version
|
||
|
|
* 2 of the License, or (at your option) any later version.
|
||
|
|
*
|
||
|
|
* PPC64 Support added by Dave Engebretsen, Todd Inglett, Mike Corrigan,
|
||
|
|
* Anton Blanchard.
|
||
|
|
*/
|
||
|
|
|
||
|
|
extern unsigned long tb_ticks_per_usec;
|
||
|
|
|
||
|
|
/* define these here to prevent circular dependencies */
|
||
|
|
#define __HMT_low() asm volatile("or 1,1,1")
|
||
|
|
#define __HMT_medium() asm volatile("or 2,2,2")
|
||
|
|
#define __barrier() asm volatile("":::"memory")
|
||
|
|
|
||
|
|
static inline unsigned long __get_tb(void)
|
||
|
|
{
|
||
|
|
unsigned long rval;
|
||
|
|
|
||
|
|
asm volatile("mftb %0" : "=r" (rval));
|
||
|
|
return rval;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void __delay(unsigned long loops)
|
||
|
|
{
|
||
|
|
unsigned long start = __get_tb();
|
||
|
|
|
||
|
|
while((__get_tb()-start) < loops)
|
||
|
|
__HMT_low();
|
||
|
|
__HMT_medium();
|
||
|
|
__barrier();
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void udelay(unsigned long usecs)
|
||
|
|
{
|
||
|
|
unsigned long loops = tb_ticks_per_usec * usecs;
|
||
|
|
|
||
|
|
__delay(loops);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* _PPC64_DELAY_H */
|