140 lines
3.7 KiB
C++
140 lines
3.7 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-20 divingkatae and maximum
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/** AWAC sound devices family definitions.
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Audio Waveform Aplifier and Converter (AWAC) is a family of custom audio
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chips used in Power Macintosh.
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*/
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#ifndef AWAC_H
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#define AWAC_H
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#include "dbdma.h"
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#include "i2c.h"
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#include <cinttypes>
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#include <thirdparty/SDL2/include/SDL.h>
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/** AWAC registers offsets. */
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enum {
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AWAC_SOUND_CTRL_REG = 0x00,
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AWAC_CODEC_CTRL_REG = 0x10,
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AWAC_CODEC_STATUS_REG = 0x20,
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};
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/** AWAC manufacturer and revision. */
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#define AWAC_MAKER_CRYSTAL 1
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#define AWAC_REV_SCREAMER 3
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/** Apple source calls this kValidData but doesn't explain
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what it actually means. It seems like it's used to check
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if the sound codec is available.
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*/
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#define AWAC_AVAILABLE 0x40
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/** Audio processor chip (TDA7433) emulation. */
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class AudioProcessor : public I2CDevice {
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public:
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AudioProcessor() = default;
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~AudioProcessor() = default;
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void start_transaction() {
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this->pos = 0;
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};
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bool send_subaddress(uint8_t sub_addr) {
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if ((sub_addr & 0xF) > 6)
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return false; /* invalid subaddress -> no acknowledge */
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this->sub_addr = sub_addr & 0xF;
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this->auto_inc = !!(sub_addr & 0x10);
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LOG_F(INFO, "TDA7433 subaddress = 0x%X, auto increment = %d", this->sub_addr, this->auto_inc);
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this->pos++;
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return true;
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};
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bool send_byte(uint8_t data) {
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if (!this->pos) {
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return send_subaddress(data);
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} else if (this->sub_addr <= 6) {
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LOG_F(INFO, "TDA7433 byte 0x%X received", data);
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this->regs[this->sub_addr] = data;
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if (this->auto_inc) {
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this->sub_addr++;
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}
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return true;
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} else {
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return false; /* invalid sub_addr -> no acknowledge */
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}
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};
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bool receive_byte(uint8_t* p_data) {
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*p_data = this->regs[this->sub_addr];
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LOG_F(INFO, "TDA7433 byte 0x%X sent", *p_data);
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return true;
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};
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private:
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uint8_t regs[7]; /* control registers, see TDA7433 datasheet */
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uint8_t sub_addr;
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int pos;
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int auto_inc;
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};
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class AWACDevice : public DMACallback {
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public:
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AWACDevice();
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~AWACDevice();
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void set_dma_out(DMAChannel* dma_out_ch);
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uint32_t snd_ctrl_read(uint32_t offset, int size);
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void snd_ctrl_write(uint32_t offset, uint32_t value, int size);
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/* DMACallback methods */
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void dma_start();
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void dma_end();
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void dma_push(uint8_t* buf, int size);
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void dma_pull(uint8_t* buf, int size);
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protected:
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uint32_t convert_data(const uint8_t* data, int len);
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private:
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uint32_t snd_ctrl_reg = {0};
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uint16_t control_regs[8] = {0}; /* control registers, each 12-bits wide */
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uint8_t is_busy = 0;
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AudioProcessor* audio_proc;
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SDL_AudioDeviceID snd_out_dev = 0;
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bool wake_up = false;
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DMAChannel* dma_out_ch;
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uint8_t* snd_buf = 0;
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uint32_t buf_len = 0;
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};
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#endif /* AWAC_H */
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