MB89352.hh

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/* Ported from:
** Source: /cvsroot/bluemsx/blueMSX/Src/IoDevice/MB89352.h,v
** Revision: 1.4
** Date: 2007/03/28 17:35:35
**
** More info: http://www.bluemsx.com
**
** Copyright (C) 2003-2007 Daniel Vik, white cat
*/
 
#ifndef MB89352_HH
#define MB89352_HH
 
#include "SCSI.hh"
#include "SCSIDevice.hh"
#include "AlignedBuffer.hh"
#include <array>
#include <memory>
 
namespace openmsx {
 
class DeviceConfig;
 
class MB89352
{
public:
        explicit MB89352(const DeviceConfig& config);
 
        void reset(bool scsiReset);
        [[nodiscard]] uint8_t readRegister(uint8_t reg);
        [[nodiscard]] uint8_t peekRegister(uint8_t reg) const;
        [[nodiscard]] uint8_t readDREG();
        [[nodiscard]] uint8_t peekDREG() const;
        void writeRegister(uint8_t reg, uint8_t value);
        void writeDREG(uint8_t value);
 
        template<typename Archive>
        void serialize(Archive& ar, unsigned version);
 
private:
        void disconnect();
        void softReset();
        void setACKREQ(uint8_t& value);
        void resetACKREQ();
        [[nodiscard]] uint8_t getSSTS() const;
 
private:
        static constexpr unsigned MAX_DEV = 8;
 
        std::array<std::unique_ptr<SCSIDevice>, MAX_DEV> dev;
        AlignedByteArray<SCSIDevice::BUFFER_SIZE> buffer; // buffer for transfer
        unsigned cdbIdx;                // cdb index
        unsigned bufIdx;                // buffer index
        int msgin = 0;                  // Message In flag
        int counter;                    // read and written number of bytes
                                        // within the range in the buffer
        unsigned blockCounter = 0;      // Number of blocks outside buffer
                                        // (512bytes / block)
        int tc;                         // counter for hardware transfer
        SCSI::Phase phase;              //
        SCSI::Phase nextPhase = SCSI::UNDEFINED; // for message system
        uint8_t myId;                   // SPC SCSI ID 0..7
        uint8_t targetId = 0;           // SCSI Device target ID 0..7
        std::array<uint8_t, 16> regs;   // SPC register
        bool rst;                       // SCSI bus reset signal
        uint8_t atn;                    // SCSI bus attention signal
        bool isEnabled;                 // spc enable flag
        bool isBusy;                    // spc now working
        bool isTransfer;                // hardware transfer mode
        //TODO: bool devBusy;           // CD-ROM busy (buffer conflict prevention)
        std::array<uint8_t, 12> cdb;    // Command Descriptor Block
};
 
} // namespace openmsx
 
#endif