Linux Kernel  3.7.1
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timex.h
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1 #ifndef _ASM_CRIS_ARCH_TIMEX_H
2 #define _ASM_CRIS_ARCH_TIMEX_H
3 
4 #include <hwregs/reg_map.h>
5 #include <hwregs/reg_rdwr.h>
6 #include <hwregs/timer_defs.h>
7 
8 /*
9  * The clock runs at 100MHz, we divide it by 1000000. If you change anything
10  * here you must check time.c as well.
11  */
12 
13 #define CLOCK_TICK_RATE 100000000 /* Underlying frequency of the HZ timer */
14 
15 /* The timer0 values gives 10 ns resolution but interrupts at HZ. */
16 #define TIMER0_FREQ (CLOCK_TICK_RATE)
17 #define TIMER0_DIV (TIMER0_FREQ/(HZ))
18 
19 /* Convert the value in step of 10 ns to 1us without overflow: */
20 #define GET_JIFFIES_USEC() \
21  ((TIMER0_DIV - REG_RD(timer, regi_timer0, r_tmr0_data)) / 100)
22 
23 extern 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
31