28 lines
574 B
C
28 lines
574 B
C
/*
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* (C) Copyright 2002
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* Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/i8254.h>
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#define TIMER2_VALUE 0x0a8e /* 440Hz */
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int pcat_timer_init(void)
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{
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/*
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* initialize 2, used to drive the speaker
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* (to start a beep: write 3 to port 0x61,
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* to stop it again: write 0)
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*/
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outb(PIT_CMD_CTR2 | PIT_CMD_BOTH | PIT_CMD_MODE3,
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PIT_BASE + PIT_COMMAND);
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outb(TIMER2_VALUE & 0xff, PIT_BASE + PIT_T2);
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outb(TIMER2_VALUE >> 8, PIT_BASE + PIT_T2);
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return 0;
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}
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