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ARM: sa1100: convert sched_clock() to use new infrastructure

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Convert sa1100 to use the new sched_clock() infrastructure for extending
32bit counters to full 64-bit nanoseconds.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2010-12-15 21:49:06 +00:00
parent 7ce8301881
commit 5094b92f1c
3 changed files with 31 additions and 23 deletions
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23
arch/arm/mach-sa1100/generic.c
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@@ -16,9 +16,7 @@
#include <linux/pm.h>
#include <linux/cpufreq.h>
#include <linux/ioport.h>
#include <linux/sched.h> /* just for sched_clock() - funny that */
#include <linux/platform_device.h>
#include <linux/cnt32_to_63.h>
#include <asm/div64.h>
#include <mach/hardware.h>
@@ -109,27 +107,6 @@ unsigned int sa11x0_getspeed(unsigned int cpu)
return cclk_frequency_100khz[PPCR & 0xf] * 100;
}
/*
* This is the SA11x0 sched_clock implementation. This has
* a resolution of 271ns, and a maximum value of 32025597s (370 days).
*
* The return value is guaranteed to be monotonic in that range as
* long as there is always less than 582 seconds between successive
* calls to this function.
*
* ( * 1E9 / 3686400 => * 78125 / 288)
*/
unsigned long long notrace sched_clock(void)
{
unsigned long long v = cnt32_to_63(OSCR);
/* the <<1 gets rid of the cnt_32_to_63 top bit saving on a bic insn */
v *= 78125<<1;
do_div(v, 288<<1);
return v;
}
/*
* Default power-off for SA1100
*/