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Sourcecode: linux-fsl-imx51 version File versions  Download package

es1888.c

/*
 *    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 */
}

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