arch/alpha/kernel/es1888.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *      linux/arch/alpha/kernel/es1888.c
   4  *
   5  * Init the built-in ES1888 sound chip (SB16 compatible)
   6  */
   7
   8 #include <linux/init.h>
   9 #include <asm/io.h>
  10 #include "proto.h"
  11
  12 void __init
  13 es1888_init(void)
  14 {
  15         /* Sequence of IO reads to init the audio controller */
  16         inb(0x0229);
  17         inb(0x0229);
  18         inb(0x0229);
  19         inb(0x022b);
  20         inb(0x0229);
  21         inb(0x022b);
  22         inb(0x0229);
  23         inb(0x0229);
  24         inb(0x022b);
  25         inb(0x0229);
  26         inb(0x0220); /* This sets the base address to 0x220 */
  27
  28         /* Sequence to set DMA channels */
  29         outb(0x01, 0x0226);             /* reset */
  30         inb(0x0226);                    /* pause */
  31         outb(0x00, 0x0226);             /* release reset */
  32         while (!(inb(0x022e) & 0x80))   /* wait for bit 7 to assert*/
  33                 continue;
  34         inb(0x022a);                    /* pause */
  35         outb(0xc6, 0x022c);             /* enable extended mode */
  36         inb(0x022a);                    /* pause, also forces the write */
  37         while (inb(0x022c) & 0x80)      /* wait for bit 7 to deassert */
  38                 continue;
  39         outb(0xb1, 0x022c);             /* setup for write to Interrupt CR */
  40         while (inb(0x022c) & 0x80)      /* wait for bit 7 to deassert */
  41                 continue;
  42         outb(0x14, 0x022c);             /* set IRQ 5 */
  43         while (inb(0x022c) & 0x80)      /* wait for bit 7 to deassert */
  44                 continue;
  45         outb(0xb2, 0x022c);             /* setup for write to DMA CR */
  46         while (inb(0x022c) & 0x80)      /* wait for bit 7 to deassert */
  47                 continue;
  48         outb(0x18, 0x022c);             /* set DMA channel 1 */
  49         inb(0x022c);                    /* force the write */
  50 }