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/*
* Copyright (c) 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
* Defines a 8250 UART
*/
#ifndef __DEV_UART8250_HH__
#define __DEV_UART8250_HH__
#include "dev/io_device.hh"
#include "dev/uart.hh"
#include "params/Uart8250.hh"
/* UART8250 Interrupt ID Register
* bit 0 Interrupt Pending 0 = true, 1 = false
* bit 2:1 ID of highest priority interrupt
* bit 7:3 zeroes
*/
const uint8_t IIR_NOPEND = 0x1;
// Interrupt IDs
const uint8_t IIR_MODEM = 0x00; /* Modem Status (lowest priority) */
const uint8_t IIR_TXID = 0x02; /* Tx Data */
const uint8_t IIR_RXID = 0x04; /* Rx Data */
const uint8_t IIR_LINE = 0x06; /* Rx Line Status (highest priority)*/
const uint8_t UART_IER_RDI = 0x01;
const uint8_t UART_IER_THRI = 0x02;
const uint8_t UART_IER_RLSI = 0x04;
const uint8_t UART_LSR_TEMT = 0x40;
const uint8_t UART_LSR_THRE = 0x20;
const uint8_t UART_LSR_DR = 0x01;
const uint8_t UART_MCR_LOOP = 0x10;
class Terminal;
class Platform;
class Uart8250 : public Uart
{
protected:
uint8_t IER, DLAB, LCR, MCR;
Tick lastTxInt;
class IntrEvent : public Event
{
protected:
Uart8250 *uart;
int intrBit;
public:
IntrEvent(Uart8250 *u, int bit);
virtual void process();
virtual const char *description() const;
void scheduleIntr();
};
IntrEvent txIntrEvent;
IntrEvent rxIntrEvent;
public:
typedef Uart8250Params Params;
const Params *
params() const
{
return dynamic_cast<const Params *>(_params);
}
Uart8250(const Params *p);
virtual Tick read(PacketPtr pkt);
virtual Tick write(PacketPtr pkt);
virtual AddrRangeList getAddrRanges() const;
/**
* Inform the uart that there is data available.
*/
virtual void dataAvailable();
/**
* Return if we have an interrupt pending
* @return interrupt status
*/
virtual bool intStatus() { return status ? true : false; }
virtual void serialize(std::ostream &os);
virtual void unserialize(Checkpoint *cp, const std::string §ion);
};
#endif // __TSUNAMI_UART_HH__
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