serial.hh

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/*
 * Copyright (c) 2014, 2017 ARM Limited
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 *
 * 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
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 * this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * Authors: Andreas Sandberg
 */

#ifndef __DEV_SERIAL_HH__
#define __DEV_SERIAL_HH__

#include "base/callback.hh"
#include "sim/sim_object.hh"

struct SerialDeviceParams;
struct SerialNullDeviceParams;

class SerialDevice : public SimObject
{
  public:
    SerialDevice(const SerialDeviceParams *p);
    ~SerialDevice();

  public: // Serial device API (UART->Device)
    void regInterfaceCallback(Callback *c);

    virtual bool dataAvailable() const = 0;

    virtual void writeData(uint8_t c) = 0;

    virtual uint8_t readData() = 0;

  protected:
    void notifyInterface();

  private:
    Callback *interfaceCallback;
};

class SerialNullDevice : public SerialDevice
{
  public:
    SerialNullDevice(const SerialNullDeviceParams *p);

  public:
    bool dataAvailable() const override { return false; }
    void writeData(uint8_t c) override {};
    uint8_t readData() override;
};

#endif // __DEV_SERIAL_HH__