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/*
* QEMU Apple Sound Chip emulation
*
* Apple Sound Chip (ASC) 344S0063
* Enhanced Apple Sound Chip (EASC) 343S1063
*
* Copyright (c) 2012-2018 Laurent Vivier <laurent@vivier.eu>
* Copyright (c) 2022 Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef HW_AUDIO_ASC_H
#define HW_AUDIO_ASC_H
#include "qemu/osdep.h"
#include "hw/sysbus.h"
#include "audio/audio.h"
#define ASC_FREQ 22257
enum {
ASC_TYPE_ASC = 0, /* original discrete Apple Sound Chip */
ASC_TYPE_EASC = 1 /* discrete Enhanced Apple Sound Chip */
};
#define ASC_FIFO_OFFSET 0x0
#define ASC_FIFO_SIZE 0x400
#define ASC_REG_OFFSET 0x800
#define ASC_REG_SIZE 0x60
#define ASC_EXTREG_OFFSET 0xf00
#define ASC_EXTREG_SIZE 0x20
typedef struct ASCFIFOState {
int index;
MemoryRegion mem_fifo;
uint8_t fifo[ASC_FIFO_SIZE];
uint8_t int_status;
int cnt;
int wptr;
int rptr;
MemoryRegion mem_extregs;
uint8_t extregs[ASC_EXTREG_SIZE];
int xa_cnt;
uint8_t xa_val;
uint8_t xa_flags;
int16_t xa_last[2];
} ASCFIFOState;
struct ASCState {
SysBusDevice parent_obj;
uint8_t type;
MemoryRegion asc;
MemoryRegion mem_fifo;
MemoryRegion mem_regs;
MemoryRegion mem_extregs;
QEMUSoundCard card;
SWVoiceOut *voice;
uint8_t *mixbuf;
int samples;
int shift;
/* Time when we were last able to generate samples */
int64_t fifo_empty_ns;
qemu_irq irq;
ASCFIFOState fifos[2];
uint8_t regs[ASC_REG_SIZE];
};
#define TYPE_ASC "apple-sound-chip"
OBJECT_DECLARE_SIMPLE_TYPE(ASCState, ASC)
#endif
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