1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
/*
|
|
* linux/arch/alpha/kernel/es1888.c
|
|
*
|
|
* Init the built-in ES1888 sound chip (SB16 compatible)
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <asm/io.h>
|
|
#include "proto.h"
|
|
|
|
void __init
|
|
es1888_init(void)
|
|
{
|
|
/* Sequence of IO reads to init the audio controller */
|
|
inb(0x0229);
|
|
inb(0x0229);
|
|
inb(0x0229);
|
|
inb(0x022b);
|
|
inb(0x0229);
|
|
inb(0x022b);
|
|
inb(0x0229);
|
|
inb(0x0229);
|
|
inb(0x022b);
|
|
inb(0x0229);
|
|
inb(0x0220); /* This sets the base address to 0x220 */
|
|
|
|
/* Sequence to set DMA channels */
|
|
outb(0x01, 0x0226); /* reset */
|
|
inb(0x0226); /* pause */
|
|
outb(0x00, 0x0226); /* release reset */
|
|
while (!(inb(0x022e) & 0x80)) /* wait for bit 7 to assert*/
|
|
continue;
|
|
inb(0x022a); /* pause */
|
|
outb(0xc6, 0x022c); /* enable extended mode */
|
|
inb(0x022a); /* pause, also forces the write */
|
|
while (inb(0x022c) & 0x80) /* wait for bit 7 to deassert */
|
|
continue;
|
|
outb(0xb1, 0x022c); /* setup for write to Interrupt CR */
|
|
while (inb(0x022c) & 0x80) /* wait for bit 7 to deassert */
|
|
continue;
|
|
outb(0x14, 0x022c); /* set IRQ 5 */
|
|
while (inb(0x022c) & 0x80) /* wait for bit 7 to deassert */
|
|
continue;
|
|
outb(0xb2, 0x022c); /* setup for write to DMA CR */
|
|
while (inb(0x022c) & 0x80) /* wait for bit 7 to deassert */
|
|
continue;
|
|
outb(0x18, 0x022c); /* set DMA channel 1 */
|
|
inb(0x022c); /* force the write */
|
|
}
|