TC8566AF.hh

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#ifndef TC8566AF_HH
#define TC8566AF_HH
 
#include "DynamicClock.hh"
#include "CRC16.hh"
#include "EmuTime.hh"
#include "Schedulable.hh"
#include "serialize_meta.hh"
#include <array>
#include <cstdint>
#include <span>
 
namespace openmsx {
 
class Scheduler;
class DiskDrive;
class MSXCliComm;
 
class TC8566AF final : public Schedulable
{
public:
        TC8566AF(Scheduler& scheduler, std::span<std::unique_ptr<DiskDrive>, 4>, MSXCliComm& cliComm,
                 EmuTime::param time);
 
        void reset(EmuTime::param time);
        [[nodiscard]] uint8_t peekDataPort(EmuTime::param time) const;
        uint8_t readDataPort(EmuTime::param time);
        [[nodiscard]] uint8_t peekStatus() const;
        uint8_t readStatus(EmuTime::param time);
        void writeControlReg0(uint8_t value, EmuTime::param time);
        void writeControlReg1(uint8_t value, EmuTime::param time);
        void writeDataPort(uint8_t value, EmuTime::param time);
        bool diskChanged(unsigned driveNum);
        [[nodiscard]] bool peekDiskChanged(unsigned driveNum) const;
 
        template<typename Archive>
        void serialize(Archive& ar, unsigned version);
 
        // public for serialization
        enum Command {
                CMD_UNKNOWN,
                CMD_READ_DATA,
                CMD_WRITE_DATA,
                CMD_WRITE_DELETED_DATA,
                CMD_READ_DELETED_DATA,
                CMD_READ_DIAGNOSTIC,
                CMD_READ_ID,
                CMD_FORMAT,
                CMD_SCAN_EQUAL,
                CMD_SCAN_LOW_OR_EQUAL,
                CMD_SCAN_HIGH_OR_EQUAL,
                CMD_SEEK,
                CMD_RECALIBRATE,
                CMD_SENSE_INTERRUPT_STATUS,
                CMD_SPECIFY,
                CMD_SENSE_DEVICE_STATUS,
        };
        enum Phase {
                PHASE_IDLE,
                PHASE_COMMAND,
                PHASE_DATA_TRANSFER,
                PHASE_RESULT,
        };
        enum SeekState {
                SEEK_IDLE,
                SEEK_SEEK,
                SEEK_RECALIBRATE
        };
 
private:
        // Schedulable
        void executeUntil(EmuTime::param time) override;
 
        [[nodiscard]] uint8_t executionPhasePeek(EmuTime::param time) const;
        uint8_t executionPhaseRead(EmuTime::param time);
        [[nodiscard]] uint8_t resultsPhasePeek() const;
        uint8_t resultsPhaseRead(EmuTime::param time);
        void idlePhaseWrite(uint8_t value, EmuTime::param time);
        void commandPhase1(uint8_t value);
        void commandPhaseWrite(uint8_t value, EmuTime::param time);
        void doSeek(int n);
        void executionPhaseWrite(uint8_t value, EmuTime::param time);
        void resultPhase(bool readId = false);
        void endCommand(EmuTime::param time);
 
        [[nodiscard]] bool isHeadLoaded(EmuTime::param time) const;
        [[nodiscard]] EmuDuration getHeadLoadDelay() const;
        [[nodiscard]] EmuDuration getHeadUnloadDelay() const;
        [[nodiscard]] EmuDuration getSeekDelay() const;
 
        [[nodiscard]] EmuTime locateSector(EmuTime::param time, bool readId);
        void startReadWriteSector(EmuTime::param time);
        void writeSector();
        void initTrackHeader(EmuTime::param time);
        void formatSector();
        void setDrqRate(unsigned trackLength);
 
private:
        MSXCliComm& cliComm;
        std::array<DiskDrive*, 4> drive;
        DynamicClock delayTime{EmuTime::zero()};
 
        // Before this time head is loaded, after this time it's unloaded. Set
        // to zero/infinity to force a (un)loaded head.
        EmuTime headUnloadTime = EmuTime::zero(); // head not loaded
 
        Command command;
        Phase phase;
        int phaseStep;
 
        //bool interrupt;
 
        unsigned dataAvailable = 0; // avoid UMR (on savestate)
        int dataCurrent = 0;
        CRC16 crc;
 
        uint8_t driveSelect;
        uint8_t mainStatus;
        uint8_t status0;
        uint8_t status1;
        uint8_t status2;
        uint8_t status3;
        uint8_t commandCode;
 
        uint8_t cylinderNumber;
        uint8_t headNumber;
        uint8_t sectorNumber;
        uint8_t number;
        uint8_t endOfTrack;
        uint8_t sectorsPerCylinder;
        uint8_t fillerByte;
        uint8_t gapLength;
        std::array<uint8_t, 2> specifyData; // filled in by SPECIFY command
 
        struct SeekInfo {
                EmuTime time = EmuTime::zero();
                uint8_t currentTrack = 0;
                uint8_t seekValue = 0;
                SeekState state = SEEK_IDLE;
 
                template<typename Archive>
                void serialize(Archive& ar, unsigned version);
        };
        std::array<SeekInfo, 4> seekInfo;
};
SERIALIZE_CLASS_VERSION(TC8566AF, 7);
 
} // namespace openmsx
 
#endif