// SPDX-License-Identifier: GPL-2.0
/*
 *      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 */
}