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.
6 #ifndef _ASM_CRIS_ARCH_TIMEX_H
7 #define _ASM_CRIS_ARCH_TIMEX_H
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))
20 #define GET_JIFFIES_USEC() \
21 ( (TIMER0_DIV - *R_TIMER0_DATA) * (1000000/HZ)/TIMER0_DIV )
23 unsigned long get_ns_in_jiffie(void);
25 static inline unsigned long get_us_in_jiffie_highres(void)
27 return get_ns_in_jiffie()/1000;