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;

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115
116DmaPort::DmaPort(DmaDevice *dev, Platform *p)
117 : Port(dev->name() + "-dmaport"), device(dev), platform(p), pendingCount(0)
118{ }
119
120bool
121DmaPort::recvTiming(Packet *pkt)
122{
123 if (pkt->senderState) {
124 DmaReqState *state;
125 DPRINTF(DMA, "Received response Packet %#x with senderState: %#x\n",
126 pkt, pkt->senderState);
127 state = dynamic_cast<DmaReqState*>(pkt->senderState);
128 assert(state);
129 state->completionEvent->process();
130 delete pkt->req;
131 delete pkt;
132 } else {
133 DPRINTF(DMA, "Received response Packet %#x with no senderState\n", pkt);
134 delete pkt->req;
135 delete pkt;
136 }
137
138 return true;
139}
140
141DmaDevice::DmaDevice(Params *p)
142 : PioDevice(p), dmaPort(NULL)
143{ }

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

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