129 lines
4.3 KiB
C++
129 lines
4.3 KiB
C++
// Copyright 2018 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include "audio_core/lle/lle.h"
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#include "common/assert.h"
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#include "common/swap.h"
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#include "teakra/teakra.h"
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namespace AudioCore {
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struct PipeStatus {
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u16_le waddress;
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u16_le bsize;
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u16_le read_bptr;
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u16_le write_bptr;
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u8 slot_index;
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u8 flags;
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};
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static_assert(sizeof(PipeStatus) == 10);
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enum class PipeDirection : u8 {
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DSPtoCPU = 0,
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CPUtoDSP = 1,
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};
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static u8 PipeIndexToSlotIndex(u8 pipe_index, PipeDirection direction) {
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return (pipe_index << 1) + (u8)direction;
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}
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struct DspLle::Impl final {
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Teakra::Teakra teakra;
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u16 pipe_base_waddr = 0;
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static constexpr unsigned TeakraSlice = 20000;
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void RunTeakraSlice() {
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teakra.Run(TeakraSlice);
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}
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u8* GetDspDataPointer(u32 baddr) {
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auto& memory = teakra.GetDspMemory();
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return &memory[0x40000 + baddr];
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}
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PipeStatus GetPipeStatus(u8 pipe_index, PipeDirection direction) {
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u8 slot_index = PipeIndexToSlotIndex(pipe_index, direction);
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PipeStatus pipe_status;
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std::memcpy(&pipe_status,
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GetDspDataPointer(pipe_base_waddr * 2 + slot_index * sizeof(PipeStatus)),
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sizeof(PipeStatus));
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ASSERT(pipe_status.slot_index == slot_index);
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return pipe_status;
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}
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void UpdatePipeStatus(const PipeStatus& pipe_status) {
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u8 slot_index = pipe_status.slot_index;
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u8* status_address =
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GetDspDataPointer(pipe_base_waddr * 2 + slot_index * sizeof(PipeStatus));
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if (slot_index % 2 == 0) {
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std::memcpy(status_address + 4, &pipe_status.read_bptr, sizeof(u16));
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} else {
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std::memcpy(status_address + 6, &pipe_status.write_bptr, sizeof(u16));
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}
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}
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void WritePipe(u8 pipe_index, const std::vector<u8>& data) {
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PipeStatus pipe_status = GetPipeStatus(pipe_index, PipeDirection::CPUtoDSP);
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bool need_update = false;
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const u8* buffer_ptr = data.data();
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u16 bsize = (u16)data.size();
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while (bsize != 0) {
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u16 x = pipe_status.read_bptr ^ pipe_status.write_bptr;
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ASSERT_MSG(x != 0x8000, "Pipe is Full");
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u16 write_bend;
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if (x > 0x8000)
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write_bend = pipe_status.read_bptr & 0x7FFF;
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else
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write_bend = pipe_status.bsize;
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u16 write_bbegin = pipe_status.write_bptr & 0x7FFF;
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ASSERT_MSG(write_bend > write_bbegin,
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"Pipe is in inconsistent state: end {:04X} <= begin {:04X}, size {:04X}",
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write_bend, write_bbegin, pipe_status.bsize);
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u16 write_bsize = std::min<u16>(bsize, write_bend - write_bbegin);
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std::memcpy(GetDspDataPointer(pipe_status.waddress * 2 + write_bbegin), buffer_ptr,
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write_bsize);
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buffer_ptr += write_bsize;
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pipe_status.write_bptr += write_bsize;
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bsize -= write_bsize;
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ASSERT_MSG((pipe_status.write_bptr & 0x7FFF) <= pipe_status.bsize,
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"Pipe is in inconsistent state: write > size");
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if ((pipe_status.write_bptr & 0x7FFF) == pipe_status.bsize) {
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pipe_status.write_bptr &= 0x8000;
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pipe_status.write_bptr ^= 0x8000;
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}
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need_update = true;
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}
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if (need_update) {
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UpdatePipeStatus(pipe_status);
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while (!teakra.SendDataIsEmpty(2))
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RunTeakraSlice();
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teakra.SendData(2, pipe_status.slot_index);
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}
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}
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};
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u16 DspLle::RecvData(u32 register_number) {
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while (!impl->teakra.RecvDataIsReady(register_number)) {
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impl->RunTeakraSlice();
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}
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return impl->teakra.RecvData(static_cast<u8>(register_number));
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}
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bool DspLle::RecvDataIsReady(u32 register_number) const {
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return impl->teakra.RecvDataIsReady(register_number);
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}
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void DspLle::SetSemaphore(u16 semaphore_value) {
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impl->teakra.SetSemaphore(semaphore_value);
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}
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void DspLle::PipeWrite(DspPipe pipe_number, const std::vector<u8>& buffer) {
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impl->WritePipe(static_cast<u8>(pipe_number), buffer);
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}
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DspLle::DspLle() : impl(std::make_unique<Impl>()) {}
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DspLle::~DspLle() = default;
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} // namespace AudioCore
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