es1888.c

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/*
 *  linux/arch/alpha/kernel/es1888.c
 *
 * Init the built-in ES1888 sound chip (SB16 compatible)
 */

#include <linux/init.h>
#include <asm/io.h>
#include "proto.h"

void __init
es1888_init(void)
{
    /* Sequence of IO reads to init the audio controller */
    inb(0x0229);
    inb(0x0229);
    inb(0x0229);
    inb(0x022b);
    inb(0x0229);
    inb(0x022b);
    inb(0x0229);
    inb(0x0229);
    inb(0x022b);
    inb(0x0229);
    inb(0x0220); /* This sets the base address to 0x220 */

    /* Sequence to set DMA channels */
    outb(0x01, 0x0226);     /* reset */
    inb(0x0226);            /* pause */
    outb(0x00, 0x0226);     /* release reset */
    while (!(inb(0x022e) & 0x80))   /* wait for bit 7 to assert*/
        continue;
    inb(0x022a);            /* pause */
    outb(0xc6, 0x022c);     /* enable extended mode */
    inb(0x022a);            /* pause, also forces the write */
    while (inb(0x022c) & 0x80)  /* wait for bit 7 to deassert */
        continue;
    outb(0xb1, 0x022c);     /* setup for write to Interrupt CR */
    while (inb(0x022c) & 0x80)  /* wait for bit 7 to deassert */
        continue;
    outb(0x14, 0x022c);     /* set IRQ 5 */
    while (inb(0x022c) & 0x80)  /* wait for bit 7 to deassert */
        continue;
    outb(0xb2, 0x022c);     /* setup for write to DMA CR */
    while (inb(0x022c) & 0x80)  /* wait for bit 7 to deassert */
        continue;
    outb(0x18, 0x022c);     /* set DMA channel 1 */
    inb(0x022c);            /* force the write */
}