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
es1888_init(void)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 }
51