diff options
Diffstat (limited to 'arch/alpha/kernel/es1888.c')
| -rw-r--r-- | arch/alpha/kernel/es1888.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/alpha/kernel/es1888.c b/arch/alpha/kernel/es1888.c new file mode 100644 index 000000000..297476bb0 --- /dev/null +++ b/arch/alpha/kernel/es1888.c @@ -0,0 +1,50 @@ +// 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 */ +} |