io_device.cc revision 2664:d341e9b3506a 
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    Tick latency = device->recvAtomic(pkt);
84    // turn packet around to go back to requester
85    pkt->makeTimingResponse();
86    sendTiming(pkt, latency);
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    bool result = true;
147    while (result && transmitList.size()) {
148        DPRINTF(DMA, "Retry on  Packet %#x with senderState: %#x\n",
149                   pkt, pkt->senderState);
150        result = sendTiming(pkt);
151        if (result) {
152            DPRINTF(DMA, "-- Done\n");
153            transmitList.pop_front();
154            pendingCount--;
155            assert(pendingCount >= 0);
156        } else {
157            DPRINTF(DMA, "-- Failed, queued\n");
158        }
159    }
160}
161
162
163void
164DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event,
165                   uint8_t *data)
166{
167    assert(event);
168
169    int prevSize = 0;
170
171    for (ChunkGenerator gen(addr, size, peerBlockSize());
172         !gen.done(); gen.next()) {
173            Request *req = new Request(gen.addr(), gen.size(), 0);
174            Packet *pkt = new Packet(req, cmd, Packet::Broadcast);
175
176            // Increment the data pointer on a write
177            if (data)
178                pkt->dataStatic(data + prevSize);
179
180            prevSize += gen.size();
181
182            // Set the last bit of the dma as the final packet for this dma
183            // and set it's completion event.
184            if (prevSize == size) {
185                pkt->senderState = new DmaReqState(event, true);
186            }
187            assert(pendingCount >= 0);
188            pendingCount++;
189            sendDma(pkt);
190    }
191}
192
193
194void
195DmaPort::sendDma(Packet *pkt)
196{
197   // some kind of selction between access methods
198   // more work is going to have to be done to make
199   // switching actually work
200  /* MemState state = device->platform->system->memState;
201
202   if (state == Timing) {  */
203       DPRINTF(DMA, "Attempting to send Packet %#x with senderState: %#x\n",
204               pkt, pkt->senderState);
205       if (transmitList.size() || !sendTiming(pkt)) {
206           transmitList.push_back(pkt);
207           DPRINTF(DMA, "-- Failed: queued\n");
208       } else {
209           DPRINTF(DMA, "-- Done\n");
210           pendingCount--;
211           assert(pendingCount >= 0);
212       }
213  /*  } else if (state == Atomic) {
214       sendAtomic(pkt);
215       if (pkt->senderState) {
216           DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState);
217           assert(state);
218           state->completionEvent->schedule(curTick + (pkt->time - pkt->req->getTime()) +1);
219       }
220       pendingCount--;
221       assert(pendingCount >= 0);
222       delete pkt->req;
223       delete pkt;
224
225   } else if (state == Functional) {
226       sendFunctional(pkt);
227       // Is this correct???
228       completionEvent->schedule(pkt->req->responseTime - pkt->req->requestTime);
229       completionEvent == NULL;
230   } else
231       panic("Unknown memory command state.");
232  */
233}
234
235DmaDevice::~DmaDevice()
236{
237    if (dmaPort)
238        delete dmaPort;
239}
240
241
242