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50 lines
1.3 KiB
50 lines
1.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/arch/alpha/kernel/es1888.c |
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* |
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* Init the built-in ES1888 sound chip (SB16 compatible) |
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*/ |
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#include <linux/init.h> |
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#include <asm/io.h> |
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#include "proto.h" |
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void __init |
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es1888_init(void) |
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{ |
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/* Sequence of IO reads to init the audio controller */ |
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inb(0x0229); |
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inb(0x0229); |
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inb(0x0229); |
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inb(0x022b); |
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inb(0x0229); |
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inb(0x022b); |
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inb(0x0229); |
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inb(0x0229); |
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inb(0x022b); |
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inb(0x0229); |
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inb(0x0220); /* This sets the base address to 0x220 */ |
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/* Sequence to set DMA channels */ |
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outb(0x01, 0x0226); /* reset */ |
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inb(0x0226); /* pause */ |
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outb(0x00, 0x0226); /* release reset */ |
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while (!(inb(0x022e) & 0x80)) /* wait for bit 7 to assert*/ |
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continue; |
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inb(0x022a); /* pause */ |
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outb(0xc6, 0x022c); /* enable extended mode */ |
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inb(0x022a); /* pause, also forces the write */ |
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while (inb(0x022c) & 0x80) /* wait for bit 7 to deassert */ |
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continue; |
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outb(0xb1, 0x022c); /* setup for write to Interrupt CR */ |
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while (inb(0x022c) & 0x80) /* wait for bit 7 to deassert */ |
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continue; |
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outb(0x14, 0x022c); /* set IRQ 5 */ |
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while (inb(0x022c) & 0x80) /* wait for bit 7 to deassert */ |
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continue; |
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outb(0xb2, 0x022c); /* setup for write to DMA CR */ |
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while (inb(0x022c) & 0x80) /* wait for bit 7 to deassert */ |
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continue; |
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outb(0x18, 0x022c); /* set DMA channel 1 */ |
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inb(0x022c); /* force the write */ |
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}
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