diff options
Diffstat (limited to 'src/dev/io_device.cc')
| -rw-r--r-- | src/dev/io_device.cc | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/src/dev/io_device.cc b/src/dev/io_device.cc new file mode 100644 index 000000000..f0509429f --- /dev/null +++ b/src/dev/io_device.cc @@ -0,0 +1,244 @@ +/* + * Copyright (c) 2006 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 + * Nathan Binkert + */ + +#include "base/trace.hh" +#include "dev/io_device.hh" +#include "sim/builder.hh" + + +PioPort::PioPort(PioDevice *dev, Platform *p) + : Port(dev->name() + "-pioport"), device(dev), platform(p) +{ } + + +Tick +PioPort::recvAtomic(Packet *pkt) +{ + return device->recvAtomic(pkt); +} + +void +PioPort::recvFunctional(Packet *pkt) +{ + device->recvAtomic(pkt); +} + +void +PioPort::getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop) +{ + snoop.clear(); + device->addressRanges(resp); +} + + +void +PioPort::recvRetry() +{ + Packet* pkt = transmitList.front(); + if (Port::sendTiming(pkt)) { + transmitList.pop_front(); + } +} + + +void +PioPort::SendEvent::process() +{ + if (port->Port::sendTiming(packet)) + return; + + port->transmitList.push_back(packet); +} + + + +bool +PioPort::recvTiming(Packet *pkt) +{ + Tick latency = device->recvAtomic(pkt); + // turn packet around to go back to requester + pkt->makeTimingResponse(); + sendTiming(pkt, latency); + return true; +} + +PioDevice::~PioDevice() +{ + if (pioPort) + delete pioPort; +} + +void +PioDevice::init() +{ + if (!pioPort) + panic("Pio port not connected to anything!"); + pioPort->sendStatusChange(Port::RangeChange); +} + +void +BasicPioDevice::addressRanges(AddrRangeList &range_list) +{ + assert(pioSize != 0); + range_list.clear(); + range_list.push_back(RangeSize(pioAddr, pioSize)); +} + + +DmaPort::DmaPort(DmaDevice *dev, Platform *p) + : Port(dev->name() + "-dmaport"), device(dev), platform(p), pendingCount(0) +{ } + +bool +DmaPort::recvTiming(Packet *pkt) +{ + if (pkt->senderState) { + DmaReqState *state; + DPRINTF(DMA, "Received response Packet %#x with senderState: %#x\n", + pkt, pkt->senderState); + state = dynamic_cast<DmaReqState*>(pkt->senderState); + assert(state); + state->completionEvent->process(); + delete pkt->req; + delete pkt; + } else { + DPRINTF(DMA, "Received response Packet %#x with no senderState\n", pkt); + delete pkt->req; + delete pkt; + } + + return true; +} + +DmaDevice::DmaDevice(Params *p) + : PioDevice(p), dmaPort(NULL) +{ } + +void +DmaPort::recvRetry() +{ + Packet* pkt = transmitList.front(); + bool result = true; + while (result && transmitList.size()) { + DPRINTF(DMA, "Retry on Packet %#x with senderState: %#x\n", + pkt, pkt->senderState); + result = sendTiming(pkt); + if (result) { + DPRINTF(DMA, "-- Done\n"); + transmitList.pop_front(); + pendingCount--; + assert(pendingCount >= 0); + } else { + DPRINTF(DMA, "-- Failed, queued\n"); + } + } +} + + +void +DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event, + uint8_t *data) +{ + assert(event); + + int prevSize = 0; + + for (ChunkGenerator gen(addr, size, peerBlockSize()); + !gen.done(); gen.next()) { + Request *req = new Request(gen.addr(), gen.size(), 0); + Packet *pkt = new Packet(req, cmd, Packet::Broadcast); + + // Increment the data pointer on a write + if (data) + pkt->dataStatic(data + prevSize); + + prevSize += gen.size(); + + // Set the last bit of the dma as the final packet for this dma + // and set it's completion event. + if (prevSize == size) { + pkt->senderState = new DmaReqState(event, true); + } + assert(pendingCount >= 0); + pendingCount++; + sendDma(pkt); + } +} + + +void +DmaPort::sendDma(Packet *pkt) +{ + // some kind of selction between access methods + // more work is going to have to be done to make + // switching actually work + /* MemState state = device->platform->system->memState; + + if (state == Timing) { */ + DPRINTF(DMA, "Attempting to send Packet %#x with senderState: %#x\n", + pkt, pkt->senderState); + if (transmitList.size() || !sendTiming(pkt)) { + transmitList.push_back(pkt); + DPRINTF(DMA, "-- Failed: queued\n"); + } else { + DPRINTF(DMA, "-- Done\n"); + pendingCount--; + assert(pendingCount >= 0); + } + /* } else if (state == Atomic) { + sendAtomic(pkt); + if (pkt->senderState) { + DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState); + assert(state); + state->completionEvent->schedule(curTick + (pkt->time - pkt->req->getTime()) +1); + } + pendingCount--; + assert(pendingCount >= 0); + delete pkt->req; + delete pkt; + + } else if (state == Functional) { + sendFunctional(pkt); + // Is this correct??? + completionEvent->schedule(pkt->req->responseTime - pkt->req->requestTime); + completionEvent == NULL; + } else + panic("Unknown memory command state."); + */ +} + +DmaDevice::~DmaDevice() +{ + if (dmaPort) + delete dmaPort; +} + + |