src/dev/riscv/rtc.hh

/*
 * Copyright (c) 2021 Huawei International
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
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 * modified or unmodified, in source code or in binary form.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
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 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#ifndef __DEV_RISCV_RTC_HH__
#define __DEV_RISCV_RTC_HH__

#include "dev/intpin.hh"
#include "dev/mc146818.hh"
#include "params/RiscvRTC.hh"
#include "sim/sim_object.hh"

namespace gem5
{

/**
 * NOTE:
 * This is a generic wrapper around the MC146818 RTC
 */

class RiscvRTC : public SimObject
{
  public:

    class RTC: public MC146818
    {
      public:
        using IntSource = IntSourcePin<RTC>;

        std::vector<std::unique_ptr<IntSource>> intPin;

        RTC(EventManager *em, const std::string &n, const struct tm time,
                bool bcd, Tick frequency, int int_pin_count);

      protected:
        void handleEvent();
    } rtc;

    typedef RiscvRTCParams Params;

    RiscvRTC(const Params &params);

    Port & getPort(const std::string &if_name,
                   PortID idx=InvalidPortID) override;

    void startup() override;

    void serialize(CheckpointOut &cp) const override;
    void unserialize(CheckpointIn &cp) override;
};

} // namespace gem5

#endif //__DEV_RISCV_RTC_HH__