| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/alpha/kernel/es1888.c |
| 3 | * |
| 4 | * Init the built-in ES1888 sound chip (SB16 compatible) |
| 5 | */ |
| 6 | |
| 7 | #include <linux/init.h> |
| 8 | #include <asm/io.h> |
| 9 | #include "proto.h" |
| 10 | |
| 11 | void __init |
| 12 | es1888_init(void) |
| 13 | { |
| 14 | /* Sequence of IO reads to init the audio controller */ |
| 15 | inb(0x0229); |
| 16 | inb(0x0229); |
| 17 | inb(0x0229); |
| 18 | inb(0x022b); |
| 19 | inb(0x0229); |
| 20 | inb(0x022b); |
| 21 | inb(0x0229); |
| 22 | inb(0x0229); |
| 23 | inb(0x022b); |
| 24 | inb(0x0229); |
| 25 | inb(0x0220); /* This sets the base address to 0x220 */ |
| 26 | |
| 27 | /* Sequence to set DMA channels */ |
| 28 | outb(0x01, 0x0226); /* reset */ |
| 29 | inb(0x0226); /* pause */ |
| 30 | outb(0x00, 0x0226); /* release reset */ |
| 31 | while (!(inb(0x022e) & 0x80)) /* wait for bit 7 to assert*/ |
| 32 | continue; |
| 33 | inb(0x022a); /* pause */ |
| 34 | outb(0xc6, 0x022c); /* enable extended mode */ |
| 35 | inb(0x022a); /* pause, also forces the write */ |
| 36 | while (inb(0x022c) & 0x80) /* wait for bit 7 to deassert */ |
| 37 | continue; |
| 38 | outb(0xb1, 0x022c); /* setup for write to Interrupt CR */ |
| 39 | while (inb(0x022c) & 0x80) /* wait for bit 7 to deassert */ |
| 40 | continue; |
| 41 | outb(0x14, 0x022c); /* set IRQ 5 */ |
| 42 | while (inb(0x022c) & 0x80) /* wait for bit 7 to deassert */ |
| 43 | continue; |
| 44 | outb(0xb2, 0x022c); /* setup for write to DMA CR */ |
| 45 | while (inb(0x022c) & 0x80) /* wait for bit 7 to deassert */ |
| 46 | continue; |
| 47 | outb(0x18, 0x022c); /* set DMA channel 1 */ |
| 48 | inb(0x022c); /* force the write */ |
| 49 | } |