Linux-2.6.12-rc2
[linux-2.6.git] / 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 }