i8253.h

 1/*
 2 * This file is subject to the terms and conditions of the GNU General Public
 3 * License.  See the file "COPYING" in the main directory of this archive
 4 * for more details.
 5 *
 6 *  Machine specific IO port address definition for generic.
 7 *  Written by Osamu Tomita <tomita@cinet.co.jp>
 8 */
 9#ifndef __LINUX_I8253_H
10#define __LINUX_I8253_H
11
12#include <linux/param.h>
13#include <linux/spinlock.h>
14#include <linux/timex.h>
15
16/* i8253A PIT registers */
17#define PIT_MODE	0x43
18#define PIT_CH0		0x40
19#define PIT_CH2		0x42
20
21#define PIT_LATCH	((PIT_TICK_RATE + HZ/2) / HZ)
22
23extern raw_spinlock_t i8253_lock;
24extern struct clock_event_device i8253_clockevent;
25extern void clockevent_i8253_init(bool oneshot);
26extern void clockevent_i8253_disable(void);
27
28extern void setup_pit_timer(void);
29
30#endif /* __LINUX_I8253_H */