io_device.cc revision 2657 
1/*
2 * Copyright (c) 2006 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include "base/trace.hh"
30#include "dev/io_device.hh"
31#include "sim/builder.hh"
32
33
34PioPort::PioPort(PioDevice *dev, Platform *p)
35    : Port(dev->name() + "-pioport"), device(dev), platform(p)
36{ }
37
38
39Tick
40PioPort::recvAtomic(Packet *pkt)
41{
42    return device->recvAtomic(pkt);
43}
44
45void
46PioPort::recvFunctional(Packet *pkt)
47{
48    device->recvAtomic(pkt);
49}
50
51void
52PioPort::getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop)
53{
54    snoop.clear();
55    device->addressRanges(resp);
56}
57
58
59void
60PioPort::recvRetry()
61{
62    Packet* pkt = transmitList.front();
63    if (Port::sendTiming(pkt)) {
64        transmitList.pop_front();
65    }
66}
67
68
69void
70PioPort::SendEvent::process()
71{
72    if (port->Port::sendTiming(packet))
73        return;
74
75    port->transmitList.push_back(packet);
76}
77
78
79
80bool
81PioPort::recvTiming(Packet *pkt)
82{
83    device->recvAtomic(pkt);
84    // turn packet around to go back to requester
85    pkt->makeTimingResponse();
86    sendTiming(pkt, pkt->time - pkt->req->getTime());
87    return true;
88}
89
90PioDevice::~PioDevice()
91{
92    if (pioPort)
93        delete pioPort;
94}
95
96void
97PioDevice::init()
98{
99    if (!pioPort)
100        panic("Pio port not connected to anything!");
101    pioPort->sendStatusChange(Port::RangeChange);
102}
103
104void
105BasicPioDevice::addressRanges(AddrRangeList &range_list)
106{
107    assert(pioSize != 0);
108    range_list.clear();
109    range_list.push_back(RangeSize(pioAddr, pioSize));
110}
111
112
113DmaPort::DmaPort(DmaDevice *dev, Platform *p)
114    : Port(dev->name() + "-dmaport"), device(dev), platform(p), pendingCount(0)
115{ }
116
117bool
118DmaPort::recvTiming(Packet *pkt)
119{
120    if (pkt->senderState) {
121        DmaReqState *state;
122        DPRINTF(DMA, "Received response Packet %#x with senderState: %#x\n",
123               pkt, pkt->senderState);
124        state = dynamic_cast<DmaReqState*>(pkt->senderState);
125        assert(state);
126        state->completionEvent->process();
127        delete pkt->req;
128        delete pkt;
129    }  else {
130        DPRINTF(DMA, "Received response Packet %#x with no senderState\n", pkt);
131        delete pkt->req;
132        delete pkt;
133    }
134
135    return true;
136}
137
138DmaDevice::DmaDevice(Params *p)
139    : PioDevice(p), dmaPort(NULL)
140{ }
141
142void
143DmaPort::recvRetry()
144{
145    Packet* pkt = transmitList.front();
146    DPRINTF(DMA, "Retry on  Packet %#x with senderState: %#x\n",
147               pkt, pkt->senderState);
148    if (sendTiming(pkt)) {
149        DPRINTF(DMA, "-- Done\n");
150        transmitList.pop_front();
151        pendingCount--;
152        assert(pendingCount >= 0);
153    } else {
154        DPRINTF(DMA, "-- Failed, queued\n");
155    }
156}
157
158
159void
160DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event,
161                   uint8_t *data)
162{
163    assert(event);
164
165    int prevSize = 0;
166
167    for (ChunkGenerator gen(addr, size, peerBlockSize());
168         !gen.done(); gen.next()) {
169            Request *req = new Request(false);
170            req->setPaddr(gen.addr());
171            req->setSize(gen.size());
172            req->setTime(curTick);
173            Packet *pkt = new Packet(req, cmd, Packet::Broadcast);
174
175            // Increment the data pointer on a write
176            if (data)
177                pkt->dataStatic(data + prevSize) ;
178
179            prevSize += gen.size();
180
181            // Set the last bit of the dma as the final packet for this dma
182            // and set it's completion event.
183            if (prevSize == size) {
184                pkt->senderState = new DmaReqState(event, true);
185            }
186            assert(pendingCount >= 0);
187            pendingCount++;
188            sendDma(pkt);
189    }
190}
191
192
193void
194DmaPort::sendDma(Packet *pkt)
195{
196   // some kind of selction between access methods
197   // more work is going to have to be done to make
198   // switching actually work
199  /* MemState state = device->platform->system->memState;
200
201   if (state == Timing) {  */
202       DPRINTF(DMA, "Attempting to send Packet %#x with senderState: %#x\n",
203               pkt, pkt->senderState);
204       if (!sendTiming(pkt)) {
205           transmitList.push_back(pkt);
206           DPRINTF(DMA, "-- Failed: queued\n");
207       } else {
208           DPRINTF(DMA, "-- Done\n");
209           pendingCount--;
210           assert(pendingCount >= 0);
211       }
212  /*  } else if (state == Atomic) {
213       sendAtomic(pkt);
214       if (pkt->senderState) {
215           DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState);
216           assert(state);
217           state->completionEvent->schedule(curTick + (pkt->time - pkt->req->getTime()) +1);
218       }
219       pendingCount--;
220       assert(pendingCount >= 0);
221       delete pkt->req;
222       delete pkt;
223
224   } else if (state == Functional) {
225       sendFunctional(pkt);
226       // Is this correct???
227       completionEvent->schedule(pkt->req->responseTime - pkt->req->requestTime);
228       completionEvent == NULL;
229   } else
230       panic("Unknown memory command state.");
231  */
232}
233
234DmaDevice::~DmaDevice()
235{
236    if (dmaPort)
237        delete dmaPort;
238}
239
240
241