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