io_device.cc revision 9808
1/* 2 * Copyright (c) 2012 ARM Limited 3 * All rights reserved. 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Copyright (c) 2006 The Regents of The University of Michigan 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions are 19 * met: redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer; 21 * redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution; 24 * neither the name of the copyright holders nor the names of its 25 * contributors may be used to endorse or promote products derived from 26 * this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * Authors: Ali Saidi 41 * Nathan Binkert 42 */ 43 44#include "base/trace.hh" 45#include "debug/BusAddrRanges.hh" 46#include "dev/io_device.hh" 47#include "sim/system.hh" 48 49PioPort::PioPort(PioDevice *dev) 50 : SimpleTimingPort(dev->name() + ".pio", dev), device(dev) 51{ 52} 53 54Tick 55PioPort::recvAtomic(PacketPtr pkt) 56{ 57 // @todo: We need to pay for this and not just zero it out 58 pkt->busFirstWordDelay = pkt->busLastWordDelay = 0; 59 60 return pkt->isRead() ? device->read(pkt) : device->write(pkt); 61} 62 63AddrRangeList 64PioPort::getAddrRanges() const 65{ 66 return device->getAddrRanges(); 67} 68 69PioDevice::PioDevice(const Params *p) 70 : MemObject(p), sys(p->system), pioPort(this) 71{} 72 73PioDevice::~PioDevice() 74{ 75} 76 77void 78PioDevice::init() 79{ 80 if (!pioPort.isConnected()) 81 panic("Pio port of %s not connected to anything!", name()); 82 pioPort.sendRangeChange(); 83} 84 85BaseSlavePort & 86PioDevice::getSlavePort(const std::string &if_name, PortID idx) 87{ 88 if (if_name == "pio") { 89 return pioPort; 90 } 91 return MemObject::getSlavePort(if_name, idx); 92} 93 94unsigned int 95PioDevice::drain(DrainManager *dm) 96{ 97 unsigned int count; 98 count = pioPort.drain(dm); 99 if (count) 100 setDrainState(Drainable::Draining); 101 else 102 setDrainState(Drainable::Drained); 103 return count; 104} 105 106BasicPioDevice::BasicPioDevice(const Params *p, Addr size) 107 : PioDevice(p), pioAddr(p->pio_addr), pioSize(size), 108 pioDelay(p->pio_latency) 109{} 110 111AddrRangeList 112BasicPioDevice::getAddrRanges() const 113{ 114 assert(pioSize != 0); 115 AddrRangeList ranges; 116 DPRINTF(BusAddrRanges, "registering range: %#x-%#x\n", pioAddr, pioSize); 117 ranges.push_back(RangeSize(pioAddr, pioSize)); 118 return ranges; 119} 120