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author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2008-12-20 04:54:54 -0500 |
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committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2008-12-20 04:54:54 -0500 |
commit | 93b8eef1c098efbea2f1fc0be7e3c681f259a7e7 (patch) | |
tree | 462cc8c2bc07bbc825dab2a200891a28d8643329 /arch/cris/include/arch-v10/arch/timex.h | |
parent | Input: libps2 - handle 0xfc responses from devices (diff) | |
parent | Linux 2.6.28-rc9 (diff) | |
download | linux-dev-93b8eef1c098efbea2f1fc0be7e3c681f259a7e7.tar.xz linux-dev-93b8eef1c098efbea2f1fc0be7e3c681f259a7e7.zip |
Merge commit 'v2.6.28-rc9' into next
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 000000000000..e48447d94faf --- /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 |