es1888.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:1k
- /*
- * 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 */
- }