Initial AWACS sound device emulation.

devices/awacs.cpp

@@ -0,0 +1,83 @@
+/*
+DingusPPC - The Experimental PowerPC Macintosh emulator
+Copyright (C) 2018-20 divingkatae and maximum
+                      (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 device emulation.
+
+    Author: Max Poliakovski 2019-20
+*/
+
+#include <thirdparty/loguru.hpp>
+#include "awacs.h"
+#include "machines/machinebase.h"
+
+AWACDevice::AWACDevice()
+{
+    this->audio_proc = new AudioProcessor();
+
+    /* register audio processor chip with the I2C bus */
+    I2CBus *i2c_bus = dynamic_cast<I2CBus *>(gMachineObj->get_comp_by_type(HWCompType::I2C_HOST));
+    i2c_bus->register_device(0x45, this->audio_proc);
+}
+
+AWACDevice::~AWACDevice()
+{
+    delete this->audio_proc;
+}
+
+uint32_t AWACDevice::snd_ctrl_read(uint32_t offset, int size)
+{
+    switch(offset) {
+    case AWAC_SOUND_CTRL_REG:
+        return this->snd_ctrl_reg;
+    case AWAC_CODEC_CTRL_REG:
+        return this->is_busy;
+    case AWAC_CODEC_STATUS_REG:
+        return (AWAC_AVAILABLE << 8) | (AWAC_MAKER_CRYSTAL << 16) |
+               (AWAC_REV_SCREAMER << 20);
+        break;
+    default:
+        LOG_F(ERROR, "AWAC: unsupported register at offset 0x%X", offset);
+    }
+
+    return 0;
+}
+
+void AWACDevice::snd_ctrl_write(uint32_t offset, uint32_t value, int size)
+{
+    int subframe, reg_num;
+    uint16_t data;
+
+    switch(offset) {
+    case AWAC_SOUND_CTRL_REG:
+        this->snd_ctrl_reg = value;
+        break;
+    case AWAC_CODEC_CTRL_REG:
+        subframe = (value >> 14) & 3;
+        reg_num  = (value >> 20) & 7;
+        data = ((value >> 8) & 0xF00) | ((value >> 24) & 0xFF);
+        LOG_F(INFO, "AWAC subframe = %d, reg = %d, data = %08X\n", subframe, reg_num, data);
+        if (!subframe)
+            this->control_regs[reg_num] = data;
+        break;
+    default:
+        LOG_F(ERROR, "AWAC: unsupported register at offset 0x%X", offset);
+    }
+}

devices/awacs.h

@@ -0,0 +1,117 @@
+/*
+DingusPPC - The Experimental PowerPC Macintosh emulator
+Copyright (C) 2018-20 divingkatae and maximum
+                      (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.
+
+    Audio Waveform Aplifier and Converter (AWAC) is a family of custom audio
+    chips used in Power Macintosh.
+ */
+
+#ifndef AWAC_H
+#define AWAC_H
+
+#include <cinttypes>
+#include "i2c.h"
+
+/** AWAC registers offsets. */
+enum {
+    AWAC_SOUND_CTRL_REG   = 0x00,
+    AWAC_CODEC_CTRL_REG   = 0x10,
+    AWAC_CODEC_STATUS_REG = 0x20,
+};
+
+/** AWAC manufacturer and revision. */
+#define AWAC_MAKER_CRYSTAL 1
+#define AWAC_REV_SCREAMER  3
+
+/** 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;
+
+    void start_transaction() { this->pos = 0; };
+
+    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(INFO, "TDA7433 subaddress = 0x%X, auto increment = %d",
+            this->sub_addr, this->auto_inc);
+        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(INFO, "TDA7433 byte 0x%X received", data);
+            this->regs[this->sub_addr] =  data;
+            if (this->auto_inc) {
+                this->sub_addr++;
+            }
+            return true;
+        } else {
+            return false; /* invalid sub_addr -> no acknowledge */
+        }
+    };
+
+    bool receive_byte(uint8_t *p_data) {
+        *p_data = this->regs[this->sub_addr];
+        LOG_F(INFO, "TDA7433 byte 0x%X sent", *p_data);
+        return true;
+    };
+
+private:
+    uint8_t regs[7];    /* control registers, see TDA7433 datasheet */
+    uint8_t sub_addr;
+    int     pos;
+    int     auto_inc;
+};
+
+
+class AWACDevice {
+public:
+    AWACDevice();
+    ~AWACDevice();
+
+    uint32_t snd_ctrl_read(uint32_t offset, int size);
+    void     snd_ctrl_write(uint32_t offset, uint32_t value, int size);
+
+private:
+    uint32_t snd_ctrl_reg = {0};
+    uint16_t control_regs[8] = {0}; /* control registers, each 12-bits wide */
+    uint8_t  is_busy = 0;
+    AudioProcessor *audio_proc;
+};
+
+
+#endif /* AWAC_H */

devices/heathrow.cpp

@@ -24,6 +24,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #include <iostream>
 #include "macio.h"
 #include "viacuda.h"
+#include "awacs.h"
 #include "machines/machinebase.h"
 
 /** Heathrow Mac I/O device emulation.
@@ -35,10 +36,12 @@ using namespace std;
 
 HeathrowIC::HeathrowIC() : PCIDevice("mac-io/heathrow")
 {
-    this->viacuda = new ViaCuda();
+    this->nvram    = new NVram();
-    this->nvram   = new NVram();
 
+    this->viacuda  = new ViaCuda();
     gMachineObj->add_subdevice("ViaCuda", this->viacuda);
+
+    this->screamer = new AWACDevice();
 }
 
 HeathrowIC::~HeathrowIC()
@@ -93,10 +96,10 @@ uint32_t HeathrowIC::read(uint32_t offset, int size)
         res = mio_ctrl_read(offset, size);
         break;
     case 8:
-        LOG_F(9, "Attempting to read DMA channel register space \n");
+        LOG_F(WARNING, "Attempting to read DMA channel register space \n");
         break;
     case 0x14:
-        LOG_F(9, "Attempting to read AWACS-Screamer register space \n");
+        res = this->screamer->snd_ctrl_read(offset - 0x14000, size);
         break;
     case 0x16:
     case 0x17:
@@ -125,10 +128,10 @@ void HeathrowIC::write(uint32_t offset, uint32_t value, int size)
         mio_ctrl_write(offset, value, size);
         break;
     case 8:
-        LOG_F(9, "Attempting to write to DMA channel register space \n");
+        LOG_F(WARNING, "Attempting to write to DMA channel register space \n");
         break;
     case 0x14:
-        LOG_F(9, "Attempting to write to AWACS-Screamer register space \n");
+        this->screamer->snd_ctrl_write(offset - 0x14000, value, size);
         break;
     case 0x16:
     case 0x17:

devices/macio.h

@@ -59,6 +59,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #include "pcihost.h"
 #include "viacuda.h"
 #include "nvram.h"
+#include "awacs.h"
 
 /**
     Heathrow ASIC emulation
@@ -126,8 +127,9 @@ private:
     uint32_t feat_ctrl;  // features control register
 
     /* device cells */
-    ViaCuda *viacuda; /* VIA cell with Cuda MCU attached to it */
+    ViaCuda *viacuda;     /* VIA cell with Cuda MCU attached to it */
-    NVram   *nvram;   /* NVRAM cell */
+    NVram   *nvram;       /* NVRAM cell */
+    AWACDevice *screamer; /* Screamer audio codec instance */
 };
 
 #endif /* MACIO_H */