Commit 08604bd9 authored Jun 16, 2009 by Arnd Bergmann Committed by Linus Torvalds Jun 16, 2009

time: move PIT_TICK_RATE to linux/timex.h



PIT_TICK_RATE is currently defined in four architectures, but in three
different places.  While linux/timex.h is not the perfect place for it, it
is still a reasonable replacement for those drivers that traditionally use
asm/timex.h to get CLOCK_TICK_RATE and expect it to be the PIT frequency.

Note that for Alpha, the actual value changed from 1193182UL to 1193180UL.
 This is unlikely to make a difference, and probably can only improve
accuracy.  There was a discussion on the correct value of CLOCK_TICK_RATE
a few years ago, after which every existing instance was getting changed
to 1193182.  According to the specification, it should be
1193181.818181...

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Len Brown <lenb@kernel.org>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Dmitry Torokhov <dtor@mail.ru>
Cc: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 03347e25

arch/alpha/include/asm/8253pit.h

+0 −7

Original line number	Diff line number	Diff line
		/*
		* 8253/8254 Programmable Interval Timer
		*/

		#ifndef _8253PIT_H
		#define _8253PIT_H

		#define PIT_TICK_RATE 1193180UL

		#endif

arch/alpha/kernel/sys_ruffian.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -14,6 +14,7 @@
		#include <linux/sched.h>
		#include <linux/pci.h>
		#include <linux/ioport.h>
		#include <linux/timex.h>
		#include <linux/init.h>

		#include <asm/ptrace.h>

arch/mips/include/asm/i8253.h

+0 −2

Original line number	Diff line number	Diff line
		@@ -12,8 +12,6 @@
		#define PIT_CH0 0x40
		#define PIT_CH2 0x42

		#define PIT_TICK_RATE 1193182UL

		extern spinlock_t i8253_lock;

		extern void setup_pit_timer(void);

arch/powerpc/include/asm/8253pit.h

+0 −7

Original line number	Diff line number	Diff line
		#ifndef _ASM_POWERPC_8253PIT_H
		#define _ASM_POWERPC_8253PIT_H

		/*
		* 8253/8254 Programmable Interval Timer
		*/

		#define PIT_TICK_RATE 1193182UL

		#endif /* _ASM_POWERPC_8253PIT_H */

arch/x86/include/asm/timex.h

+1 −3

Original line number	Diff line number	Diff line
		@@ -4,9 +4,7 @@
		#include <asm/processor.h>
		#include <asm/tsc.h>

		/* The PIT ticks at this frequency (in HZ): */
		#define PIT_TICK_RATE 1193182

		/* Assume we use the PIT time source for the clock tick */
		#define CLOCK_TICK_RATE PIT_TICK_RATE

		#define ARCH_HAS_READ_CURRENT_TIMER