arch/alpha/kernel/es1888.c

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