dingusppc/devices/sound/awacs.h

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/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-21 divingkatae and maximum
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(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/** AWAC sound devices family definitions.
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Audio Waveform Amplifier and Converters (AWACs) is a family of custom audio
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chips used in Power Macintosh.
*/
#ifndef AWAC_H
#define AWAC_H
#include <devices/common/dbdma.h>
#include <devices/common/dmacore.h>
#include <devices/common/i2c/i2c.h>
#include <devices/sound/soundserver.h>
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#include <cinttypes>
#include <memory>
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/** Base class for the AWACs codecs. */
class AwacsBase {
public:
AwacsBase();
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~AwacsBase() = default;
void set_dma_out(DmaOutChannel *dma_out_ch) {
this->dma_out_ch = dma_out_ch;
};
void set_sample_rate(int sr_id);
void start_output_dma();
void stop_output_dma();
protected:
SoundServer *snd_server; // SoundServer instance pointer
DmaOutChannel *dma_out_ch; // DMA output channel instance pointer
int *sr_table; // pointer to the table of supported sample rates
int max_sr_id; // maximum value for sample rate ID
bool out_stream_ready;
int cur_sample_rate;
};
/** AWACs PDM-style sound codec. */
class AwacDevicePdm : public AwacsBase {
public:
AwacDevicePdm();
~AwacDevicePdm() = default;
uint32_t read_stat(void);
void write_ctrl(uint32_t addr, uint16_t value);
void dma_out_start(uint8_t sample_rate_id);
void dma_out_stop();
private:
uint16_t ctrl_regs[5]; // 12-bit wide control registers
};
/** AWACs Screamer registers offsets. */
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enum {
AWAC_SOUND_CTRL_REG = 0x00,
AWAC_CODEC_CTRL_REG = 0x10,
AWAC_CODEC_STATUS_REG = 0x20,
};
/** AWACs Screamer manufacturer and revision. */
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#define AWAC_MAKER_CRYSTAL 1
#define AWAC_REV_SCREAMER 3
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/** Apple source calls this kValidData but doesn't explain
what it actually means. It seems like it's used to check
if the sound codec is available.
*/
#define AWAC_AVAILABLE 0x40
/** Audio processor chip (TDA7433) emulation. */
class AudioProcessor : public I2CDevice {
public:
AudioProcessor() = default;
~AudioProcessor() = default;
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void start_transaction() {
this->pos = 0;
};
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bool send_subaddress(uint8_t sub_addr) {
if ((sub_addr & 0xF) > 6)
return false; /* invalid subaddress -> no acknowledge */
this->sub_addr = sub_addr & 0xF;
this->auto_inc = !!(sub_addr & 0x10);
LOG_F(9, "TDA7433 subaddress = 0x%X, auto increment = %d",
this->sub_addr, this->auto_inc);
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this->pos++;
return true;
};
bool send_byte(uint8_t data) {
if (!this->pos) {
return send_subaddress(data);
} else if (this->sub_addr <= 6) {
LOG_F(9, "TDA7433 byte 0x%X received", data);
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this->regs[this->sub_addr] = data;
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if (this->auto_inc) {
this->sub_addr++;
}
return true;
} else {
return false; /* invalid sub_addr -> no acknowledge */
}
};
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bool receive_byte(uint8_t* p_data) {
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*p_data = this->regs[this->sub_addr];
LOG_F(9, "TDA7433 byte 0x%X sent", *p_data);
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return true;
};
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;
int auto_inc;
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};
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/** AWACs Screamer sound codec. */
class AwacsScreamer : public AwacsBase {
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public:
AwacsScreamer();
~AwacsScreamer() = default;
uint32_t snd_ctrl_read(uint32_t offset, int size);
void snd_ctrl_write(uint32_t offset, uint32_t value, int size);
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void dma_start();
void dma_end();
protected:
void open_stream(int sample_rate);
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private:
uint32_t snd_ctrl_reg = { 0 };
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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int out_sample_rate;
std::unique_ptr<AudioProcessor> audio_proc;
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};
#endif /* AWAC_H */