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Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * (C) Copyright 2002 | |
3 | * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se> | |
4 | * | |
5 | * SPDX-License-Identifier: GPL-2.0+ | |
6 | */ | |
7 | ||
8 | #include <common.h> | |
9 | #include <asm/io.h> | |
10 | #include <asm/i8254.h> | |
11 | ||
12 | #define TIMER2_VALUE 0x0a8e /* 440Hz */ | |
13 | ||
14 | int pcat_timer_init(void) | |
15 | { | |
16 | /* | |
17 | * initialize 2, used to drive the speaker | |
18 | * (to start a beep: write 3 to port 0x61, | |
19 | * to stop it again: write 0) | |
20 | */ | |
21 | outb(PIT_CMD_CTR2 | PIT_CMD_BOTH | PIT_CMD_MODE3, | |
22 | PIT_BASE + PIT_COMMAND); | |
23 | outb(TIMER2_VALUE & 0xff, PIT_BASE + PIT_T2); | |
24 | outb(TIMER2_VALUE >> 8, PIT_BASE + PIT_T2); | |
25 | ||
26 | return 0; | |
27 | } |