linux - arch/alpha/kernel/es1888.c

50 lines · 1.3 KiB

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
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	}