i8253: Consolidate definitions of PIT_LATCH
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>
diff --git a/include/linux/i8253.h b/include/linux/i8253.h
index 13048d3..1ec6323 100644
--- a/include/linux/i8253.h
+++ b/include/linux/i8253.h
@@ -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