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Commit f5e0e93f authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Thomas Gleixner
Browse files

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: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarChris Wright <chrisw@sous-sol.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarArjan van de Ven <arjan@linux.intel.com>
parent 28769149

arch/x86/kernel/i8253_32.c

+3 −1
Original line number Diff line number Diff line
@@ -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

include/asm-x86/i8253_32.h

+4 −2
Original line number Diff line number Diff line 
#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__ */