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i386: prepare sharing the PIT code 

PIT clock events work already and the PIT handling is the same for
i386 and x86_64. x86_64 does not support PIT as a clock source, so
disable the PIT clocksource for x86_64.

Prepare i8253.h to be shared with x8664

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
This commit is contained in:
Thomas Gleixner 2007-10-12 23:04:06 +02:00 committed by Thomas Gleixner
parent 28769149c2
commit f5e0e93faf
2 changed files with 7 additions and 3 deletions
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4
arch/x86/kernel/i8253_32.c
View File

@ -13,7 +13,6 @@
#include <asm/delay.h>
#include <asm/i8253.h>
#include <asm/io.h>
#include <asm/timer.h>
DEFINE_SPINLOCK(i8253_lock);
EXPORT_SYMBOL(i8253_lock);
@ -120,6 +119,7 @@ void __init setup_pit_timer(void)
global_clock_event = &pit_clockevent;
}
#ifndef CONFIG_X86_64
/*
* Since the PIT overflows every tick, its not very useful
* to just read by itself. So use jiffies to emulate a free
@ -204,3 +204,5 @@ static int __init init_pit_clocksource(void)
return clocksource_register(&clocksource_pit);
}
arch_initcall(init_pit_clocksource);
#endif

6
include/asm-x86/i8253_32.h
View File

@ -1,8 +1,6 @@
#ifndef __ASM_I8253_H__
#define __ASM_I8253_H__
#include <linux/clockchips.h>
/* i8253A PIT registers */
#define PIT_MODE 0x43
#define PIT_CH0 0x40
@ -10,8 +8,12 @@
extern spinlock_t i8253_lock;
#ifdef CONFIG_GENERIC_CLOCKEVENTS
extern struct clock_event_device *global_clock_event;
extern void setup_pit_timer(void);
#endif
#endif /* __ASM_I8253_H__ */