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i8253: Consolidate definitions of PIT_LATCH

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x86 defines PIT_LATCH as LATCH which in <linux/timex.h> is defined as
((CLOCK_TICK_RATE + HZ/2) / HZ) and <asm/timex.h> again defines
CLOCK_TICK_RATE as PIT_TICK_RATE.

MIPS defines PIT_LATCH as LATCH which in <linux/timex.h> is defined as
((CLOCK_TICK_RATE + HZ/2) / HZ) and <asm/timex.h> again defines
CLOCK_TICK_RATE as 1193182.

ARM defines PITCH_LATCH as ((PIT_TICK_RATE + HZ / 2) / HZ) - and that's
the sanest thing and equivalent to above definitions so use that as the
new definition in <linux/i8253.h>.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-mips@linux-mips.org
Link: http://lkml.kernel.org/r/20110601180610.832810002@duck.linux-mips.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ralf Baechle 2011-06-01 19:05:07 +01:00 committed by Thomas Gleixner
parent 16f871bc30
commit 49cf3f29a1
4 changed files with 4 additions and 6 deletions
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2
arch/arm/include/asm/i8253.h
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@ -1,6 +1,4 @@
#ifndef __ASMARM_I8253_H
#define __ASMARM_I8253_H
#define PIT_LATCH ((PIT_TICK_RATE + HZ / 2) / HZ)
#endif

2
arch/mips/include/asm/i8253.h
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@ -5,8 +5,6 @@
#ifndef __ASM_I8253_H
#define __ASM_I8253_H
#define PIT_LATCH LATCH
extern void setup_pit_timer(void);
#endif /* __ASM_I8253_H */

2
arch/x86/include/asm/i8253.h
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@ -1,8 +1,6 @@
#ifndef _ASM_X86_I8253_H
#define _ASM_X86_I8253_H
#define PIT_LATCH LATCH
extern void setup_pit_timer(void);
#endif /* _ASM_X86_I8253_H */

4
include/linux/i8253.h
View File

@ -9,7 +9,9 @@
#ifndef __LINUX_I8253_H
#define __LINUX_I8253_H
#include <linux/param.h>
#include <linux/spinlock.h>
#include <linux/timex.h>
#include <asm/i8253.h>
/* i8253A PIT registers */
@ -17,6 +19,8 @@
#define PIT_CH0 0x40
#define PIT_CH2 0x42
#define PIT_LATCH ((PIT_TICK_RATE + HZ/2) / HZ)
#define inb_pit inb_p
#define outb_pit outb_p