Basic SWIM3 and Superdrive emulation.

devices/floppy/superdrive.cpp

@@ -0,0 +1,70 @@
+/*
+DingusPPC - The Experimental PowerPC Macintosh emulator
+Copyright (C) 2018-21 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/>.
+*/
+
+/** @file Macintosh Superdrive emulation. */
+
+#include "superdrive.h"
+#include <loguru.hpp>
+
+#include <cinttypes>
+
+using namespace MacSuperdrive;
+
+MacSuperDrive::MacSuperDrive()
+{
+    this->media_kind = MediaKind::high_density;
+}
+
+void MacSuperDrive::command(uint8_t addr, uint8_t value)
+{
+    LOG_F(9, "Superdrive: command addr=0x%X, value=%d", addr, value);
+
+    switch(addr) {
+    case CommandAddr::Motor_On_Off:
+        if (value) {
+            LOG_F(INFO, "Superdrive: turn spindle motor off");
+        } else {
+            LOG_F(INFO, "Superdrive: turn spindle motor on");
+        }
+        break;
+    default:
+        LOG_F(WARNING, "Superdrive: unimplemented command, addr=0x%X", addr);
+    }
+}
+
+uint8_t MacSuperDrive::status(uint8_t addr)
+{
+    LOG_F(9, "Superdrive: status request, addr = 0x%X", addr);
+
+    switch(addr) {
+    case StatusAddr::MFM_Support:
+        return 1; // Superdrive does support MFM encoding scheme
+    case StatusAddr::Double_Sided:
+        return 1; // yes, Superdrive is double sided
+    case StatusAddr::Drive_Exists:
+        return 0; // tell the world I'm here
+    case StatusAddr::Media_Kind:
+        return this->media_kind;
+    default:
+        LOG_F(WARNING, "Superdrive: unimplemented status request, addr=0x%X", addr);
+        return 0;
+    }
+}

devices/floppy/superdrive.h

@@ -0,0 +1,64 @@
+/*
+DingusPPC - The Experimental PowerPC Macintosh emulator
+Copyright (C) 2018-21 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/>.
+*/
+
+/** @file Macintosh Superdrive definitions. */
+
+#ifndef MAC_SUPERDRIVE_H
+#define MAC_SUPERDRIVE_H
+
+#include <cinttypes>
+
+namespace MacSuperdrive {
+
+/** Apple Drive status request addresses. */
+enum StatusAddr : uint8_t {
+    MFM_Support  = 5,
+    Double_Sided = 6,
+    Drive_Exists = 7,
+    Media_Kind   = 0xF
+};
+
+/** Apple Drive command addresses. */
+enum CommandAddr : uint8_t {
+    Motor_On_Off = 2,
+};
+
+/** Type of media currently in the drive. */
+enum MediaKind : uint8_t {
+    high_density = 0, // 1 or 2 MB disk
+    low_density  = 1
+};
+
+class MacSuperDrive {
+public:
+    MacSuperDrive();
+    ~MacSuperDrive() = default;
+
+    void command(uint8_t addr, uint8_t value);
+    uint8_t status(uint8_t addr);
+
+private:
+    uint8_t media_kind;
+};
+
+}; // namespace MacSuperdrive
+
+#endif // MAC_SUPERDRIVE_H

devices/floppy/swim3.cpp

@@ -0,0 +1,104 @@
+/*
+DingusPPC - The Experimental PowerPC Macintosh emulator
+Copyright (C) 2018-21 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/>.
+*/
+
+/** @file Sander-Wozniak Machine 3 (SWIM3) emulation. */
+
+#include "superdrive.h"
+#include "swim3.h"
+#include <loguru.hpp>
+
+#include <cinttypes>
+#include <memory>
+
+using namespace Swim3;
+
+Swim3Ctrl::Swim3Ctrl()
+{
+    this->setup_reg = 0;
+    this->mode_reg  = 0;
+    this->int_reg   = 0;
+    this->int_mask  = 0;
+    this->xfer_cnt  = 0;
+    this->first_sec = 0xFF;
+
+    // Attach virtual Superdrive to the internal drive connector
+    // TODO: make SWIM3/drive wiring user selectable
+    this->int_drive = std::unique_ptr<MacSuperdrive::MacSuperDrive>
+        (new MacSuperdrive::MacSuperDrive());
+}
+
+uint8_t Swim3Ctrl::read(uint8_t reg_offset)
+{
+    uint8_t status_addr;
+
+    switch(reg_offset) {
+    case Swim3Reg::Phase:
+        return this->phase_lines;
+    case Swim3Reg::Setup:
+        return this->setup_reg;
+    case Swim3Reg::Handshake_Mode1:
+        if (this->mode_reg & 2) { // internal drive?
+            status_addr = ((this->mode_reg & 0x20) >> 2) | (this->phase_lines & 7);
+            return ((this->int_drive->status(status_addr) & 1) << 2);
+        } else {
+            return 4;
+        }
+    default:
+        LOG_F(INFO, "SWIM3: reading from 0x%X register", reg_offset);
+    }
+    return 0;
+}
+
+void Swim3Ctrl::write(uint8_t reg_offset, uint8_t value)
+{
+    switch(reg_offset) {
+    case Swim3Reg::Param_Data:
+        this->pram = value;
+        break;
+    case Swim3Reg::Phase:
+        this->phase_lines = value & 0xF;
+        if (value & 8) {
+            if (this->mode_reg & 2) { // internal drive?
+                this->int_drive->command(
+                    ((this->mode_reg & 0x20) >> 3) | (this->phase_lines & 3),
+                    (value >> 2) & 1
+                );
+            }
+        }
+        break;
+    case Swim3Reg::Setup:
+        this->setup_reg = value;
+        break;
+    case Swim3Reg::Status_Mode0:
+        // ones in value clear the corresponding bits in the mode register
+        this->mode_reg &= ~value;
+        break;
+    case Swim3Reg::Handshake_Mode1:
+        // ones in value set the corresponding bits in the mode register
+        this->mode_reg |= value;
+        break;
+    case Swim3Reg::Interrupt_Mask:
+        this->int_mask = value;
+        break;
+    default:
+        LOG_F(INFO, "SWIM3: writing 0x%X to register 0x%X", value, reg_offset);
+    }
+}

devices/floppy/swim3.h

@@ -0,0 +1,78 @@
+/*
+DingusPPC - The Experimental PowerPC Macintosh emulator
+Copyright (C) 2018-21 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/>.
+*/
+
+/** @file Sander-Wozniak Machine 3 (SWIM3) definitions. */
+
+#ifndef SWIM3_H
+#define SWIM3_H
+
+#include "superdrive.h"
+
+#include <cinttypes>
+#include <memory>
+
+/** SWIM3 registers offsets. */
+namespace Swim3 {
+
+enum Swim3Reg : uint8_t {
+    Data            = 0,
+    Timer           = 1,
+    Error           = 2,
+    Param_Data      = 3,
+    Phase           = 4,
+    Setup           = 5,
+    Status_Mode0    = 6,  // read: Status, write: zeroes to the mode register
+    Handshake_Mode1 = 7,  // read: Handshake, write: ones to the mode register
+    Interrupt       = 8,
+    Step            = 9,
+    Current_Track   = 10,
+    Current_Sector  = 11,
+    Gap_Format      = 12,
+    First_Sector    = 13,
+    Sectors_To_Xfer = 14,
+    Interrupt_Mask  = 15
+};
+
+class Swim3Ctrl {
+public:
+    Swim3Ctrl();
+    ~Swim3Ctrl() = default;
+
+    // SWIM3 registers access
+    uint8_t read(uint8_t reg_offset);
+    void    write(uint8_t reg_offset, uint8_t value);
+
+private:
+    std::unique_ptr<MacSuperdrive::MacSuperDrive> int_drive;
+
+    uint8_t setup_reg;
+    uint8_t mode_reg;
+    uint8_t phase_lines;
+    uint8_t int_reg;
+    uint8_t int_mask;
+    uint8_t pram;       // parameter RAM: two nibbles = {late_time, early_time}
+    uint8_t first_sec;
+    uint8_t xfer_cnt;
+};
+
+}; // namespace Swim3
+
+#endif // SWIM3_H

devices/ioctrl/amic.cpp

@@ -28,6 +28,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #include <devices/common/scsi/ncr53c94.h>
 #include <devices/common/viacuda.h>
 #include <devices/ethernet/mace.h>
+#include <devices/floppy/swim3.h>
 #include <devices/ioctrl/amic.h>
 #include <devices/serial/escc.h>
 #include <machines/machinebase.h>
@@ -66,6 +67,9 @@ AMIC::AMIC()
     // initialize on-board video
     this->disp_id = std::unique_ptr<DisplayID> (new DisplayID());
     this->def_vid = std::unique_ptr<PdmOnboardVideo> (new PdmOnboardVideo());
+
+    // intialize floppy disk HW
+    this->swim3 = std::unique_ptr<Swim3::Swim3Ctrl> (new Swim3::Swim3Ctrl());
 }
 
 bool AMIC::supports_type(HWCompType type) {
@@ -113,6 +117,9 @@ uint32_t AMIC::read(uint32_t reg_start, uint32_t offset, int size)
         case AMICReg::Snd_Out_DMA:
             return this->snd_out_dma->read_stat();
         }
+    case 0x16: // SWIM3 registers
+    case 0x17:
+        return this->swim3->read((offset >> 9) & 0xF);
     }
 
     switch(offset) {
@@ -196,6 +203,10 @@ void AMIC::write(uint32_t reg_start, uint32_t offset, uint32_t value, int size)
             this->snd_out_dma->write_dma_out_ctrl(value);
             return;
         }
+    case 0x16: // SWIM3 registers
+    case 0x17:
+        this->swim3->write((offset >> 9) & 0xF, value);
+        return;
     }
 
     switch(offset) {

devices/ioctrl/amic.h

@@ -28,6 +28,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #include <devices/common/scsi/ncr53c94.h>
 #include <devices/common/viacuda.h>
 #include <devices/ethernet/mace.h>
+#include <devices/floppy/swim3.h>
 #include <devices/serial/escc.h>
 #include <devices/sound/awacs.h>
 #include <devices/video/displayid.h>
@@ -166,6 +167,8 @@ private:
     std::unique_ptr<DisplayID>          disp_id;
     std::unique_ptr<PdmOnboardVideo>    def_vid;
     uint8_t                             mon_id;
+
+    std::unique_ptr<Swim3::Swim3Ctrl>   swim3;
 };
 
 #endif // AMIC_H

devices/ioctrl/heathrow.cpp

@@ -22,6 +22,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #include <cpu/ppc/ppcemu.h>
 #include <devices/common/dbdma.h>
 #include <devices/common/viacuda.h>
+#include <devices/floppy/swim3.h>
 #include <devices/ioctrl/macio.h>
 #include <devices/serial/escc.h>
 #include <devices/sound/awacs.h>
@@ -58,6 +59,7 @@ HeathrowIC::HeathrowIC() : PCIDevice("mac-io/heathrow") {
 
     this->mesh  = std::unique_ptr<MESHController> (new MESHController(HeathrowMESHID));
     this->escc  = std::unique_ptr<EsccController> (new EsccController());
+    this->swim3 = std::unique_ptr<Swim3::Swim3Ctrl> (new Swim3::Swim3Ctrl());
 }
 
 uint32_t HeathrowIC::pci_cfg_read(uint32_t reg_offs, uint32_t size) {
@@ -136,6 +138,8 @@ uint32_t HeathrowIC::read(uint32_t reg_start, uint32_t offset, int size) {
     case 0x14:
         res = this->screamer->snd_ctrl_read(offset - 0x14000, size);
         break;
+    case 0x15: // SWIM3
+        return this->swim3->read(offset & 0xF);
     case 0x16:
     case 0x17:
         res = this->viacuda->read((offset - 0x16000) >> 9);
@@ -175,6 +179,9 @@ void HeathrowIC::write(uint32_t reg_start, uint32_t offset, uint32_t value, int
     case 0x14:
         this->screamer->snd_ctrl_write(offset - 0x14000, value, size);
         break;
+    case 0x15:
+        this->swim3->write(offset & 0xF, value);
+        break;
     case 0x16:
     case 0x17:
         this->viacuda->write((offset - 0x16000) >> 9, value);

devices/ioctrl/macio.h

@@ -59,6 +59,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #include <devices/common/pci/pcihost.h>
 #include <devices/common/scsi/mesh.h>
 #include <devices/common/viacuda.h>
+#include <devices/floppy/swim3.h>
 #include <devices/memctrl/memctrlbase.h>
 #include <devices/serial/escc.h>
 #include <devices/sound/awacs.h>
@@ -159,6 +160,7 @@ private:
     std::unique_ptr<AwacsScreamer>      screamer; // Screamer audio codec instance
     std::unique_ptr<MESHController>     mesh;     // MESH SCSI cell instance
     std::unique_ptr<EsccController>     escc;     // ESCC serial controller
+    std::unique_ptr<Swim3::Swim3Ctrl>   swim3;    // floppy disk controller
 
     std::unique_ptr<DMAChannel>     snd_out_dma;
 };