31 lines
943 B
C
31 lines
943 B
C
|
/*
|
||
|
|
* Use prescale timer at 25000 Hz instead of the baudrate timer at
|
||
|
|
* 19200 to get rid of the 64ppm to fast timer (and we get better
|
||
|
|
* resolution within a jiffie as well.
|
||
|
|
*/
|
||
|
|
#ifndef _ASM_CRIS_ARCH_TIMEX_H
|
||
|
|
#define _ASM_CRIS_ARCH_TIMEX_H
|
||
|
|
|
||
|
|
/* The prescaler clock runs at 25MHz, we divide it by 1000 in the prescaler */
|
||
|
|
/* If you change anything here you must check time.c as well... */
|
||
|
|
#define PRESCALE_FREQ 25000000
|
||
|
|
#define PRESCALE_VALUE 1000
|
||
|
|
#define CLOCK_TICK_RATE 25000 /* Underlying frequency of the HZ timer */
|
||
|
|
/* The timer0 values gives 40us resolution (1/25000) but interrupts at HZ*/
|
||
|
|
#define TIMER0_FREQ (CLOCK_TICK_RATE)
|
||
|
|
#define TIMER0_CLKSEL flexible
|
||
|
|
#define TIMER0_DIV (TIMER0_FREQ/(HZ))
|
||
|
|
|
||
|
|
|
||
|
|
#define GET_JIFFIES_USEC() \
|
||
|
|
( (TIMER0_DIV - *R_TIMER0_DATA) * (1000000/HZ)/TIMER0_DIV )
|
||
|
|
|
||
|
|
unsigned long get_ns_in_jiffie(void);
|
||
|
|
|
||
|
|
extern inline unsigned long get_us_in_jiffie_highres(void)
|
||
|
|
{
|
||
|
|
return get_ns_in_jiffie()/1000;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|