UioAccess.h

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// SPDX-FileCopyrightText: Deutsches Elektronen-Synchrotron DESY, MSK, ChimeraTK Project <chimeratk-support@desy.de>
// SPDX-License-Identifier: LGPL-3.0-or-later
#pragma once
 
#include <atomic>
#include <filesystem>
#include <memory>
#include <string>
 
namespace ChimeraTK {
  class UioAccess {
   private:
    std::filesystem::path _deviceFilePath;
    int _deviceFileDescriptor = 0;
    void* _deviceUserBase = nullptr;
    void* _deviceKernelBase = nullptr;
    size_t _deviceMemSize = 0;
    uint32_t _lastInterruptCount = 0;
    std::atomic<bool> _opened{false};
 
    void UioMMap();
 
    void UioUnmap();
 
    static std::string lookupUioDevFromDtNode(const std::string dtNodeNname);
 
    uint32_t subtractUint32OverflowSafe(uint32_t minuend, uint32_t subtrahend);
 
    uint32_t readUint32FromFile(std::string fileName);
 
    uint64_t readUint64HexFromFile(std::string fileName);
 
   public:
    explicit UioAccess(const std::string& deviceFilePath);
    ~UioAccess();
 
    void open();
 
    void close();
 
    void read(uint64_t map, uint64_t address, int32_t* data, size_t sizeInBytes);
 
    void write(uint64_t map, uint64_t address, int32_t const* data, size_t sizeInBytes);
 
    uint32_t waitForInterrupt(int timeoutMs);
 
    void clearInterrupts();
 
    std::string getDeviceFilePath();
  };
} // namespace ChimeraTK