diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-11-01 09:51:51 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-11-01 09:51:51 -0700 |
commit | 0242909a6135e10a28822c64f9ad50fdad52757c (patch) | |
tree | c5f9c8abe95a65433e6ac356871f2379c02488fe /arch/cris/include/arch-v10/arch/timex.h | |
parent | 0a6d2fac615972142715d736289abeeb7382e81d (diff) | |
parent | 556dcee7b829e5c350c3ffdbdb87a8b15aa3c5d3 (diff) |
Merge branch 'cris_move' of git://www.jni.nu/cris
* 'cris_move' of git://www.jni.nu/cris:
[CRIS] Move header files from include to arch/cris/include.
[CRISv32] Remove warning in io.h
Diffstat (limited to 'arch/cris/include/arch-v10/arch/timex.h')
-rw-r--r-- | arch/cris/include/arch-v10/arch/timex.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/cris/include/arch-v10/arch/timex.h b/arch/cris/include/arch-v10/arch/timex.h new file mode 100644 index 00000000000..e48447d94fa --- /dev/null +++ b/arch/cris/include/arch-v10/arch/timex.h @@ -0,0 +1,30 @@ +/* + * 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); + +static inline unsigned long get_us_in_jiffie_highres(void) +{ + return get_ns_in_jiffie()/1000; +} + +#endif |