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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 | |
23 | extern raw_spinlock_t i8253_lock; |
24 | extern struct clock_event_device i8253_clockevent; |
25 | extern void clockevent_i8253_init(bool oneshot); |
26 | |
27 | extern void setup_pit_timer(void); |
28 | |
29 | #endif /* __LINUX_I8253_H */ |
30 |
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