jabyengine/include/PSX/System/IOPorts/cd_io.hpp

#ifndef __JABYENGINE_CD_IO_HPP__
#define __JABYENGINE_CD_IO_HPP__
#include "ioport.hpp"

namespace JabyEngine {
    namespace CD_IO {
        enum struct Index {
            Index0 = 0,
            Index1 = 1,
            Index2 = 2,
            Index3 = 3,
        };

        struct CDDAVolume {
            typedef uint8_t Type;

            static constexpr uint8_t Off     = 0x0;
            static constexpr uint8_t Default = 0x80;
            static constexpr uint8_t Max     = 0xFF;
        };

        typedef struct IndexStatus : public ComplexBitMap<uint8_t> {
            static constexpr auto PortIndex             = BitRange<Index>::from_to(0, 1);
            static constexpr auto HasXAFifoData         = Bit<uint8_t>(2);
            static constexpr auto IsParameterFifoEmpty  = Bit<uint8_t>(3);
            static constexpr auto HasParameterFifoSpace = Bit<uint8_t>(4);
            static constexpr auto HasResponseFifoData   = Bit<uint8_t>(5);
            static constexpr auto HasDataFifoData       = Bit<uint8_t>(6);
            static constexpr auto IsTransmissionBusy    = Bit<uint8_t>(7);
        } IndexStatus_t;

        struct InterruptEnable : public ComplexBitMap<uint8_t> {
            static constexpr auto InterruptTypValue = BitRange<uint8_t>::from_to(0, 2);
            static constexpr auto UnknownIRQ        = Bit<uint8_t>(3);
            static constexpr auto CommandStartIRQ   = Bit<uint8_t>(4);
        };
        typedef InterruptEnable InterruptFlag;

        struct Request : public ComplexBitMap<uint8_t> {
            static constexpr auto WantCommandStartIRQ = Bit<uint8_t>(5);
            static constexpr auto WantData            = Bit<uint8_t>(7);
        };

        struct SoundMapCoding : public ComplexBitMap<uint8_t> {
            static constexpr auto Stereo             = Bit<uint8_t>(0);
            static constexpr auto Mono               = !Stereo;
            static constexpr auto SampleRate_18900hz = Bit<uint8_t>(2);
            static constexpr auto SampleRate_37800hz = !SampleRate_18900hz;
            static constexpr auto BitsPerSample8     = Bit<uint8_t>(4);
            static constexpr auto BitsPerSample4     = !BitsPerSample8;
            static constexpr auto Emphasis           = Bit<uint8_t>(6);
        };

        struct AudioVolumeApply : public ComplexBitMap<uint8_t> {
            static constexpr auto Mute         = Bit<uint8_t>(0);
            static constexpr auto ApplyChanges = Bit<uint8_t>(5);
        };        

        struct Interrupt {
            static void enable_all(VolatileBitMapPOD<InterruptEnable>& port) {
                port.write({InterruptEnable::with(InterruptEnable::InterruptTypValue.max(), InterruptEnable::UnknownIRQ, InterruptEnable::CommandStartIRQ)});
            }

            static uint8_t get_type(const VolatileBitMapPOD<InterruptFlag>& port) {
                return port.read().get_value(InterruptFlag::InterruptTypValue);
            }

            static void ack(VolatileBitMapPOD<InterruptFlag>& port) {
                port.write(InterruptFlag::InterruptTypValue.max());
            }
        };

        __declare_io_port_global(IndexStatus_t, IndexStatus, 0x1F801800);
        
        static constexpr auto IORegister1Adr = 0x1F801801;
        static constexpr auto IORegister2Adr = 0x1F801802;
        static constexpr auto IORegister3Adr = 0x1F801803;

        struct Index0 {
            __declare_io_port_member_const_simple(uint8_t, ResponseFifo, IORegister1Adr);
                  __declare_io_port_member_simple(uint8_t, CommandFifo,  IORegister1Adr);

            __declare_io_port_member_const_simple(uint8_t,  DataFifo, IORegister2Adr);
            __declare_io_port_member_const_simple(uint16_t, DataFifo16, IORegister2Adr);
        };

        typedef VolatilePOD<uint8_t>                ResponseFifo;
        typedef VolatilePOD<uint8_t>                CommandFifo;
        typedef VolatilePOD<uint8_t>                DataFifo;
        typedef VolatilePOD<uint16_t>               DataFifo16;
        typedef VolatilePOD<uint8_t>                ParameterFifo;
        typedef VolatilePOD<uint8_t>                SoundMapDataOut;
        typedef VolatilePOD<CDDAVolume::Type>       VolumeRegister;
        typedef VolatileBitMapPOD<InterruptEnable>  InterruptEnableRegister;
        typedef VolatileBitMapPOD<InterruptFlag>    InterruptFlagRegister;
        typedef VolatileBitMapPOD<Request>          RequestRegister;
        typedef VolatileBitMapPOD<SoundMapCoding>   SoundMapCodingInfo;
        typedef VolatileBitMapPOD<AudioVolumeApply> AudioVolumeApplyChange;

        namespace Index0Types {
            struct __no_align IndexTriplet {
                union __no_align {
                    const ResponseFifo response_fifo;
                    CommandFifo        command;
                };

                union __no_align {
                    const DataFifo data_fifo;
                    ParameterFifo  parameter_fifo;
                };

                union __no_align {
                    const InterruptEnableRegister irq_enable;
                    RequestRegister               request;
                };
            };

            static_assert(sizeof(IndexTriplet) == 3);
        }

        namespace Index1Types {
            struct __no_align IndexTriplet {
                union __no_align {
                    const ResponseFifo response_fifo;
                    SoundMapDataOut    sound_map_data_out;
                };

                union __no_align {
                    const DataFifo          data_fifo;
                    InterruptEnableRegister irq_enable;
                };

                union __no_align {
                    InterruptFlagRegister irq_flag;
                };
            };

            static_assert(sizeof(IndexTriplet) == 3);
        }

        namespace Index2Types {
            struct __no_align IndexTriplet {
                union __no_align {
                    const ResponseFifo response_fifo;
                    SoundMapCodingInfo sound_map_coding_info;
                };

                union __no_align {
                    const DataFifo data_fifo;
                    VolumeRegister left_cd_2_left_spu;
                };

                union __no_align {
                    const InterruptEnableRegister irq_enable;
                    VolumeRegister                left_cd_2_right_spu;
                };
            };

            static_assert(sizeof(IndexTriplet) == 3);
        }

        namespace Index3Types {
            struct __no_align IndexTriplet {
                union __no_align {
                    const ResponseFifo response_fifo;
                    VolumeRegister     right_cd_2_right_spu;
                };

                union __no_align {
                    const DataFifo data_fifo;
                    VolumeRegister right_cd_2_left_spu;
                };

                union __no_align {
                    const InterruptFlagRegister irq_flag;
                    AudioVolumeApplyChange      audio_volume_change;
                };
            };

            static_assert(sizeof(IndexTriplet) == 3);            
        }

        

        namespace Helper {
            template<typename S>
            static S& change_to(Index idx) {
                IndexStatus.write({static_cast<uint8_t>(idx)});
                return *reinterpret_cast<S*>(0x1F801801);
            }
        }

        static Index0Types::IndexTriplet& change_to_index0() {
            return Helper::change_to<Index0Types::IndexTriplet>(Index::Index0);
        }

        static Index1Types::IndexTriplet& change_to_index1() {
            return Helper::change_to<Index1Types::IndexTriplet>(Index::Index1);
        }

        static Index2Types::IndexTriplet& change_to_index2() {
            return Helper::change_to<Index2Types::IndexTriplet>(Index::Index2);
        }

        static Index3Types::IndexTriplet& change_to_index3() {
            return Helper::change_to<Index3Types::IndexTriplet>(Index::Index2);
        }
    }
}

#endif //!__JABYENGINE_CD_IO_HPP__