2 * Copyright (c) 2004-2005 The Regents of The University of Michigan
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32 #ifndef __DEV_IO_DEVICE_HH__
33 #define __DEV_IO_DEVICE_HH__
35 #include "base/fast_alloc.hh"
36 #include "mem/mem_object.hh"
37 #include "mem/packet.hh"
38 #include "mem/tport.hh"
39 #include "params/BasicPioDevice.hh"
40 #include "params/DmaDevice.hh"
41 #include "params/PioDevice.hh"
42 #include "sim/sim_object.hh"
50 * The PioPort class is a programmed i/o port that all devices that are
51 * sensitive to an address range use. The port takes all the memory
52 * access types and roles them into one read() and write() call that the device
53 * must respond to. The device must also provide the addressRanges() function
54 * with which it returns the address ranges it is interested in.
56 class PioPort : public SimpleTimingPort
59 /** The device that this port serves. */
62 virtual Tick recvAtomic(PacketPtr pkt);
64 virtual void getDeviceAddressRanges(AddrRangeList &resp,
69 PioPort(PioDevice *dev, System *s, std::string pname = "-pioport");
73 class DmaPort : public Port
76 struct DmaReqState : public Packet::SenderState, public FastAlloc
78 /** Event to call on the device when this transaction (all packets)
80 Event *completionEvent;
82 /** Where we came from for some sanity checking. */
85 /** Total number of bytes that this transaction involves. */
88 /** Number of bytes that have been acked for this transaction. */
91 /** Amount to delay completion of dma by */
95 DmaReqState(Event *ce, Port *p, Addr tb, Tick _delay)
96 : completionEvent(ce), outPort(p), totBytes(tb), numBytes(0),
102 std::list<PacketPtr> transmitList;
104 /** The system that device/port are in. This is used to select which mode
105 * we are currently operating in. */
108 /** Number of outstanding packets the dma port has. */
111 /** If a dmaAction is in progress. */
112 int actionInProgress;
114 /** If we need to drain, keep the drain event around until we're done
118 /** time to wait between sending another packet, increases as NACKs are
119 * recived, decreases as responses are recived. */
122 /** Minimum time that device should back off for after failed sendTiming */
123 Tick minBackoffDelay;
125 /** Maximum time that device should back off for after failed sendTiming */
126 Tick maxBackoffDelay;
128 /** If the port is currently waiting for a retry before it can send whatever
129 * it is that it's sending. */
132 /** Port accesses a cache which requires snooping */
135 /** Records snoop response so we only reply once to a status change */
138 virtual bool recvTiming(PacketPtr pkt);
139 virtual Tick recvAtomic(PacketPtr pkt)
141 if (recvSnoops) return 0;
143 panic("dma port shouldn't be used for pio access."); M5_DUMMY_RETURN
145 virtual void recvFunctional(PacketPtr pkt)
147 if (recvSnoops) return;
149 panic("dma port shouldn't be used for pio access.");
152 virtual void recvStatusChange(Status status)
155 if (status == RangeChange) {
156 if (!snoopRangeSent) {
157 snoopRangeSent = true;
158 sendStatusChange(Port::RangeChange);
162 panic("Unexpected recvStatusChange\n");
166 virtual void recvRetry() ;
168 virtual void getDeviceAddressRanges(AddrRangeList &resp,
170 { resp.clear(); snoop = recvSnoops; }
172 void queueDma(PacketPtr pkt, bool front = false);
175 /** event to give us a kick every time we backoff time is reached. */
176 EventWrapper<DmaPort, &DmaPort::sendDma> backoffEvent;
179 DmaPort(MemObject *dev, System *s, Tick min_backoff, Tick max_backoff,
180 bool recv_snoops = false);
182 void dmaAction(Packet::Command cmd, Addr addr, int size, Event *event,
183 uint8_t *data, Tick delay, Request::Flags flag = 0);
185 bool dmaPending() { return pendingCount > 0; }
187 unsigned cacheBlockSize() const { return peerBlockSize(); }
188 unsigned int drain(Event *de);
192 * This device is the base class which all devices senstive to an address range
193 * inherit from. There are three pure virtual functions which all devices must
194 * implement addressRanges(), read(), and write(). The magic do choose which
195 * mode we are in, etc is handled by the PioPort so the device doesn't have to
198 class PioDevice : public MemObject
203 /** The pioPort that handles the requests for us and provides us requests
207 virtual void addressRanges(AddrRangeList &range_list) = 0;
209 /** Pure virtual function that the device must implement. Called
210 * when a read command is recieved by the port.
211 * @param pkt Packet describing this request
212 * @return number of ticks it took to complete
214 virtual Tick read(PacketPtr pkt) = 0;
216 /** Pure virtual function that the device must implement. Called when a
217 * write command is recieved by the port.
218 * @param pkt Packet describing this request
219 * @return number of ticks it took to complete
221 virtual Tick write(PacketPtr pkt) = 0;
224 typedef PioDeviceParams Params;
225 PioDevice(const Params *p);
226 virtual ~PioDevice();
231 return dynamic_cast<const Params *>(_params);
236 virtual unsigned int drain(Event *de);
238 virtual Port *getPort(const std::string &if_name, int idx = -1);
240 friend class PioPort;
244 class BasicPioDevice : public PioDevice
247 /** Address that the device listens to. */
250 /** Size that the device's address range. */
253 /** Delay that the device experinces on an access. */
257 typedef BasicPioDeviceParams Params;
258 BasicPioDevice(const Params *p);
263 return dynamic_cast<const Params *>(_params);
266 /** return the address ranges that this device responds to.
267 * @param range_list range list to populate with ranges
269 void addressRanges(AddrRangeList &range_list);
273 class DmaDevice : public PioDevice
279 typedef DmaDeviceParams Params;
280 DmaDevice(const Params *p);
281 virtual ~DmaDevice();
286 return dynamic_cast<const Params *>(_params);
289 void dmaWrite(Addr addr, int size, Event *event, uint8_t *data, Tick delay = 0)
291 dmaPort->dmaAction(MemCmd::WriteReq, addr, size, event, data, delay);
294 void dmaRead(Addr addr, int size, Event *event, uint8_t *data, Tick delay = 0)
296 dmaPort->dmaAction(MemCmd::ReadReq, addr, size, event, data, delay);
299 bool dmaPending() { return dmaPort->dmaPending(); }
301 virtual unsigned int drain(Event *de);
303 unsigned cacheBlockSize() const { return dmaPort->cacheBlockSize(); }
305 virtual Port *getPort(const std::string &if_name, int idx = -1);
307 friend class DmaPort;
311 #endif // __DEV_IO_DEVICE_HH__