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