1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
/*
* 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 */
}
|
