gem5/src/dev/uart.hh

/*
 * Copyright (c) 2004-2005 The Regents of The University of Michigan
 * All rights reserved.
 *
 * 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
 * documentation and/or other materials provided with the distribution;
 * 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
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Authors: Ali Saidi
 */

/** @file
 * Base class for UART
 */

#ifndef __UART_HH__
#define __UART_HH__

#include "dev/io_device.hh"
#include "dev/terminal.hh"
#include "params/Uart.hh"

class Platform;

const int RX_INT = 0x1;
const int TX_INT = 0x2;

class Uart : public BasicPioDevice
{
  protected:
    int status;
    Platform *platform;
    Terminal *term;

  public:
    typedef UartParams Params;
    Uart(const Params *p, Addr pio_size);

    const Params *
    params() const
    {
        return dynamic_cast<const Params *>(_params);
    }

    /**
     * Inform the uart that there is data available.
     */
    virtual void dataAvailable() = 0;

    /**
     * Return if we have an interrupt pending
     * @return interrupt status
     */
    bool intStatus() { return status ? true : false; }

  protected:
    MakeCallback<Uart, &Uart::dataAvailable> callbackDataAvail;
};

#endif // __UART_HH__