include/hw/audio/asc.h

   1 /*
   2  * QEMU Apple Sound Chip emulation
   3  *
   4  * Apple Sound Chip (ASC) 344S0063
   5  * Enhanced Apple Sound Chip (EASC) 343S1063
   6  *
   7  * Copyright (c) 2012-2018 Laurent Vivier <laurent@vivier.eu>
   8  * Copyright (c) 2022 Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
   9  *
  10  * SPDX-License-Identifier: GPL-2.0-or-later
  11  */
  12
  13 #ifndef HW_AUDIO_ASC_H
  14 #define HW_AUDIO_ASC_H
  15
  16 #include "hw/sysbus.h"
  17 #include "audio/audio.h"
  18
  19 #define ASC_FREQ 22257
  20
  21 enum {
  22     ASC_TYPE_ASC    = 0,  /* original discrete Apple Sound Chip */
  23     ASC_TYPE_EASC   = 1   /* discrete Enhanced Apple Sound Chip */
  24 };
  25
  26 #define ASC_FIFO_OFFSET    0x0
  27 #define ASC_FIFO_SIZE      0x400
  28
  29 #define ASC_REG_OFFSET     0x800
  30 #define ASC_REG_SIZE       0x60
  31
  32 #define ASC_EXTREG_OFFSET  0xf00
  33 #define ASC_EXTREG_SIZE    0x20
  34
  35 typedef struct ASCFIFOState {
  36     int index;
  37
  38     MemoryRegion mem_fifo;
  39     uint8_t fifo[ASC_FIFO_SIZE];
  40     uint8_t int_status;
  41
  42     int cnt;
  43     int wptr;
  44     int rptr;
  45
  46     MemoryRegion mem_extregs;
  47     uint8_t extregs[ASC_EXTREG_SIZE];
  48
  49     int xa_cnt;
  50     uint8_t xa_val;
  51     uint8_t xa_flags;
  52     int16_t xa_last[2];
  53 } ASCFIFOState;
  54
  55 struct ASCState {
  56     SysBusDevice parent_obj;
  57
  58     uint8_t type;
  59     MemoryRegion asc;
  60     MemoryRegion mem_fifo;
  61     MemoryRegion mem_regs;
  62     MemoryRegion mem_extregs;
  63
  64     QEMUSoundCard card;
  65     SWVoiceOut *voice;
  66     uint8_t *mixbuf;
  67     int samples;
  68     int shift;
  69
  70     uint8_t *silentbuf;
  71
  72     /* Time when we were last able to generate samples */
  73     int64_t fifo_empty_ns;
  74
  75     qemu_irq irq;
  76
  77     ASCFIFOState fifos[2];
  78
  79     uint8_t regs[ASC_REG_SIZE];
  80 };
  81
  82 #define TYPE_ASC "apple-sound-chip"
  83 OBJECT_DECLARE_SIMPLE_TYPE(ASCState, ASC)
  84
  85 #endif