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 11void __init 12es1888_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} 50