1/* 2 * linux/include/asm-cris/timex.h 3 * 4 * CRIS architecture timex specifications 5 * 2002-03-04 Johan Adolfsson 6 * Use prescale timer at 25000 Hz instead of the baudrate timer at 7 * 19200 to get rid of the 64ppm to fast timer (and we get better 8 * resolution within a jiffie as well. 9 */ 10#ifndef _ASM_CRIS_TIMEX_H 11#define _ASM_CRIS_TIMEX_H 12 13/* The prescaler clock runs at 25MHz, we divide it by 1000 in the prescaler */ 14/* If you change anything here you must check time.c as well... */ 15#define PRESCALE_FREQ 25000000 16#define PRESCALE_VALUE 1000 17#define CLOCK_TICK_RATE 25000 /* Underlying frequency of the HZ timer */ 18/* The timer0 values gives 40us resolution (1/25000) but interrupts at HZ*/ 19#define TIMER0_FREQ (CLOCK_TICK_RATE) 20#define TIMER0_CLKSEL flexible 21#define TIMER0_DIV (TIMER0_FREQ/(HZ)) 22 23 24#define GET_JIFFIES_USEC() \ 25 ( (TIMER0_DIV - *R_TIMER0_DATA) * (1000000/HZ)/TIMER0_DIV ) 26 27unsigned long get_ns_in_jiffie(void); 28 29unsigned long timer_data_to_ns(unsigned long timer_data); 30 31extern inline unsigned long get_us_in_jiffie_highres(void) 32{ 33 return get_ns_in_jiffie()/1000; 34} 35/* 36 * We don't have a cycle-counter.. but we do not support SMP anyway where this is 37 * used so it does not matter. 38 */ 39 40typedef unsigned int cycles_t; 41 42extern inline cycles_t get_cycles(void) 43{ 44 return 0; 45} 46 47#define vxtime_lock() do {} while (0) 48#define vxtime_unlock() do {} while (0) 49 50#endif 51