arch/ppc-chrp/efika/timer/lowlevel.h

   1 /*
   2  * lowlevel.h
   3  *
   4  *  Created on: Sep 30, 2008
   5  *      Author: misc
   6  */
   7
   8 #ifndef LOWLEVEL_H_
   9 #define LOWLEVEL_H_
  10
  11 #include <inttypes.h>
  12 #include "timer_intern.h"
  13
  14 #define TIMEBASE_FREQUENCY 33000000
  15
  16 void EClockUpdate(struct TimerBase *TimerBase);
  17 void EClockSet(struct TimerBase *TimerBase);
  18 void TimerSetup(struct TimerBase *TimerBase, uint32_t waste);
  19
  20 static volatile uint32_t mftbl()
  21 {
  22         uint32_t tb;
  23
  24         asm volatile("mftb %0":"=r"(tb));
  25
  26         return tb;
  27 }
  28
  29 static inline uint64_t mftb()
  30 {
  31         uint32_t lo,hi,tmp;
  32
  33         do {
  34                 asm volatile("mftbu %0; mftb %1; mftbu %2":"=r"(hi),"=r"(lo),"=r"(tmp));
  35         } while(tmp != hi);
  36
  37         return (((uint64_t)hi) << 32) | ((uint64_t)lo);
  38 }
  39
  40 #endif /* LOWLEVEL_H_ */