include/asm-cris/arch-v10/timex.h

   1 /*
   2  * Use prescale timer at 25000 Hz instead of the baudrate timer at
   3  * 19200 to get rid of the 64ppm to fast timer (and we get better
   4  * resolution within a jiffie as well.
   5  */
   6 #ifndef _ASM_CRIS_ARCH_TIMEX_H
   7 #define _ASM_CRIS_ARCH_TIMEX_H
   8
   9 /* The prescaler clock runs at 25MHz, we divide it by 1000 in the prescaler */
  10 /* If you change anything here you must check time.c as well... */
  11 #define PRESCALE_FREQ 25000000
  12 #define PRESCALE_VALUE 1000
  13 #define CLOCK_TICK_RATE 25000 /* Underlying frequency of the HZ timer */
  14 /* The timer0 values gives 40us resolution (1/25000) but interrupts at HZ*/
  15 #define TIMER0_FREQ (CLOCK_TICK_RATE)
  16 #define TIMER0_CLKSEL flexible
  17 #define TIMER0_DIV (TIMER0_FREQ/(HZ))
  18
  19
  20 #define GET_JIFFIES_USEC() \
  21   ( (TIMER0_DIV - *R_TIMER0_DATA) * (1000000/HZ)/TIMER0_DIV )
  22
  23 unsigned long get_ns_in_jiffie(void);
  24
  25 static inline unsigned long get_us_in_jiffie_highres(void)
  26 {
  27         return get_ns_in_jiffie()/1000;
  28 }
  29
  30 #endif