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(port: 0x0229); |
17 | inb(port: 0x0229); |
18 | inb(port: 0x0229); |
19 | inb(port: 0x022b); |
20 | inb(port: 0x0229); |
21 | inb(port: 0x022b); |
22 | inb(port: 0x0229); |
23 | inb(port: 0x0229); |
24 | inb(port: 0x022b); |
25 | inb(port: 0x0229); |
26 | inb(port: 0x0220); /* This sets the base address to 0x220 */ |
27 | |
28 | /* Sequence to set DMA channels */ |
29 | outb(value: 0x01, port: 0x0226); /* reset */ |
30 | inb(port: 0x0226); /* pause */ |
31 | outb(value: 0x00, port: 0x0226); /* release reset */ |
32 | while (!(inb(port: 0x022e) & 0x80)) /* wait for bit 7 to assert*/ |
33 | continue; |
34 | inb(port: 0x022a); /* pause */ |
35 | outb(value: 0xc6, port: 0x022c); /* enable extended mode */ |
36 | inb(port: 0x022a); /* pause, also forces the write */ |
37 | while (inb(port: 0x022c) & 0x80) /* wait for bit 7 to deassert */ |
38 | continue; |
39 | outb(value: 0xb1, port: 0x022c); /* setup for write to Interrupt CR */ |
40 | while (inb(port: 0x022c) & 0x80) /* wait for bit 7 to deassert */ |
41 | continue; |
42 | outb(value: 0x14, port: 0x022c); /* set IRQ 5 */ |
43 | while (inb(port: 0x022c) & 0x80) /* wait for bit 7 to deassert */ |
44 | continue; |
45 | outb(value: 0xb2, port: 0x022c); /* setup for write to DMA CR */ |
46 | while (inb(port: 0x022c) & 0x80) /* wait for bit 7 to deassert */ |
47 | continue; |
48 | outb(value: 0x18, port: 0x022c); /* set DMA channel 1 */ |
49 | inb(port: 0x022c); /* force the write */ |
50 | } |
51 | |