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