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* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
* Machine specific IO port address definition for generic.
* Written by Osamu Tomita <>
#ifndef __LINUX_I8253_H
#define __LINUX_I8253_H
#include <linux/param.h>
#include <linux/spinlock.h>
#include <linux/timex.h>
/* i8253A PIT registers */
#define PIT_MODE 0x43
#define PIT_CH0 0x40
#define PIT_CH2 0x42
#define PIT_LATCH ((PIT_TICK_RATE + HZ/2) / HZ)
extern raw_spinlock_t i8253_lock;
extern struct clock_event_device i8253_clockevent;
extern void clockevent_i8253_init(bool oneshot);
extern void setup_pit_timer(void);
#endif /* __LINUX_I8253_H */