| 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/core/sysbus.h" |
| 17 | #include "qemu/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 | AudioBackend *audio_be; |
| 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 |