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[IA64] remove time interpolator

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Remove time_interpolator code (This is generic code, but
only user was ia64.  It has been superseded by the
CONFIG_GENERIC_TIME code).

Signed-off-by: Bob Picco <[email protected]>
Signed-off-by: John Stultz <[email protected]>
Signed-off-by: Peter Keilty <[email protected]>
Signed-off-by: Tony Luck <[email protected]>
This commit is contained in:
Bob Picco 2007-07-18 15:51:28 -07:00 • committed by Tony Luck
commit 1f564ad6d4
6 changed files with 0 additions and 391 deletions
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41
Documentation/time_interpolators.txt
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@ -1,41 +0,0 @@
Time Interpolators
------------------
Time interpolators are a base of time calculation between timer ticks and
allow an accurate determination of time down to the accuracy of the time
source in nanoseconds.
The architecture specific code typically provides gettimeofday and
settimeofday under Linux. The time interpolator provides both if an arch
defines CONFIG_TIME_INTERPOLATION. The arch still must set up timer tick
operations and call the necessary functions to advance the clock.
With the time interpolator a standardized interface exists for time
interpolation between ticks. The provided logic is highly scalable
and has been tested in SMP situations of up to 512 CPUs.
If CONFIG_TIME_INTERPOLATION is defined then the architecture specific code
(or the device drivers - like HPET) may register time interpolators.
These are typically defined in the following way:
static struct time_interpolator my_interpolator {
.frequency = MY_FREQUENCY,
.source = TIME_SOURCE_MMIO32,
.shift = 8, /* scaling for higher accuracy */
.drift = -1, /* Unknown drift */
.jitter = 0 /* time source is stable */
};
void time_init(void)
{
....
/* Initialization of the timer *.
my_interpolator.address = &my_timer;
register_time_interpolator(&my_interpolator);
....
}
For more details see include/linux/timex.h and kernel/timer.c.
Christoph Lameter <[email protected]>, October 31, 2004