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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42
43
44Tick
45PioPort::recvAtomic(PacketPtr pkt)
46{
47 return pkt->isRead() ? device->read(pkt) : device->write(pkt);
48}
49
50void
51PioPort::getDeviceAddressRanges(AddrRangeList &resp, bool &snoop)
52{
53 snoop = false;
54 device->addressRanges(resp);
55 for (AddrRangeIter i = resp.begin(); i != resp.end(); i++)
56 DPRINTF(BusAddrRanges, "Adding Range %#x-%#x\n", i->start, i->end);
57}
58
59
60PioDevice::PioDevice(const Params *p)
61 : MemObject(p), sys(p->system), pioPort(NULL)
62{}
63
64PioDevice::~PioDevice()
65{
66 if (pioPort)
67 delete pioPort;
68}
69
70void
71PioDevice::init()
72{
73 if (!pioPort)
74 panic("Pio port not connected to anything!");
75 pioPort->sendStatusChange(Port::RangeChange);
76}
77
78
79unsigned int
80PioDevice::drain(Event *de)
81{
82 unsigned int count;
83 count = pioPort->drain(de);
84 if (count)
85 changeState(Draining);
86 else
87 changeState(Drained);
88 return count;
89}
90
91BasicPioDevice::BasicPioDevice(const Params *p)
92 : PioDevice(p), pioAddr(p->pio_addr), pioSize(0),
93 pioDelay(p->pio_latency)
94{}
95
96void
97BasicPioDevice::addressRanges(AddrRangeList &range_list)
98{
99 assert(pioSize != 0);
100 range_list.clear();
101 DPRINTF(BusAddrRanges, "registering range: %#x-%#x\n", pioAddr, pioSize);
102 range_list.push_back(RangeSize(pioAddr, pioSize));
103}
104
105
106DmaPort::DmaPort(MemObject *dev, System *s, Tick min_backoff, Tick max_backoff)
107 : Port(dev->name() + "-dmaport", dev), device(dev), sys(s),
108 pendingCount(0), actionInProgress(0), drainEvent(NULL),
109 backoffTime(0), minBackoffDelay(min_backoff),
110 maxBackoffDelay(max_backoff), inRetry(false), backoffEvent(this)
111{ }
112
113bool
114DmaPort::recvTiming(PacketPtr pkt)
115{
116 if (pkt->wasNacked()) {
117 DPRINTF(DMA, "Received nacked %s addr %#x\n",
118 pkt->cmdString(), pkt->getAddr());
119
120 if (backoffTime < minBackoffDelay)
121 backoffTime = minBackoffDelay;
122 else if (backoffTime < maxBackoffDelay)
123 backoffTime <<= 1;
124
125 reschedule(backoffEvent, curTick() + backoffTime, true);
126
127 DPRINTF(DMA, "Backoff time set to %d ticks\n", backoffTime);
128
129 pkt->reinitNacked();
130 queueDma(pkt, true);
131 } else if (pkt->senderState) {
132 DmaReqState *state;
133 backoffTime >>= 2;
134
135 DPRINTF(DMA, "Received response %s addr %#x size %#x\n",
136 pkt->cmdString(), pkt->getAddr(), pkt->req->getSize());
137 state = dynamic_cast<DmaReqState*>(pkt->senderState);
138 pendingCount--;

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143 // We shouldn't ever get a block in ownership state
144 assert(!(pkt->memInhibitAsserted() && !pkt->sharedAsserted()));
145
146 state->numBytes += pkt->req->getSize();
147 assert(state->totBytes >= state->numBytes);
148 if (state->totBytes == state->numBytes) {
149 if (state->completionEvent) {
150 if (state->delay)
151 schedule(state->completionEvent, curTick() + state->delay);
152 else
153 state->completionEvent->process();
154 }
155 delete state;
156 }
157 delete pkt->req;
158 delete pkt;
159

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213 inRetry = true;
214 DPRINTF(DMA, "-- Failed, queued\n");
215 }
216 } while (!backoffTime && result && transmitList.size());
217
218 if (transmitList.size() && backoffTime && !inRetry) {
219 DPRINTF(DMA, "Scheduling backoff for %d\n", curTick()+backoffTime);
220 if (!backoffEvent.scheduled())
221 schedule(backoffEvent, backoffTime + curTick());
222 }
223 DPRINTF(DMA, "TransmitList: %d, backoffTime: %d inRetry: %d es: %d\n",
224 transmitList.size(), backoffTime, inRetry,
225 backoffEvent.scheduled());
226}
227
228
229void

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299 DPRINTF(DMA, "-- Failed: queued\n");
300 }
301 } while (result && !backoffTime && transmitList.size());
302
303 if (transmitList.size() && backoffTime && !inRetry &&
304 !backoffEvent.scheduled()) {
305 DPRINTF(DMA, "-- Scheduling backoff timer for %d\n",
306 backoffTime+curTick());
307 schedule(backoffEvent, backoffTime + curTick());
308 }
309 } else if (state == Enums::atomic) {
310 transmitList.pop_front();
311
312 Tick lat;
313 DPRINTF(DMA, "--Sending DMA for addr: %#x size: %d\n",
314 pkt->req->getPaddr(), pkt->req->getSize());
315 lat = sendAtomic(pkt);

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321 DPRINTF(DMA, "--Received response for DMA for addr: %#x size: %d nb: %d, tot: %d sched %d\n",
322 pkt->req->getPaddr(), pkt->req->getSize(), state->numBytes,
323 state->totBytes,
324 state->completionEvent ? state->completionEvent->scheduled() : 0 );
325
326 if (state->totBytes == state->numBytes) {
327 if (state->completionEvent) {
328 assert(!state->completionEvent->scheduled());
329 schedule(state->completionEvent, curTick() + lat + state->delay);
330 }
331 delete state;
332 delete pkt->req;
333 }
334 pendingCount--;
335 assert(pendingCount >= 0);
336 delete pkt;
337

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344 panic("Unknown memory command state.");
345}
346
347DmaDevice::~DmaDevice()
348{
349 if (dmaPort)
350 delete dmaPort;
351}