// SPDX-License-Identifier: GPL-2.0 /* * 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 */ }