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32 #ifndef __DEV_IO_DEVICE_HH__
33 #define __DEV_IO_DEVICE_HH__
35 #include "base/chunk_generator.hh"
36 #include "mem/mem_object.hh"
37 #include "mem/packet_impl.hh"
38 #include "sim/eventq.hh"
39 #include "sim/sim_object.hh"
47 * The PioPort class is a programmed i/o port that all devices that are
48 * sensitive to an address range use. The port takes all the memory
49 * access types and roles them into one read() and write() call that the device
50 * must respond to. The device must also provide the addressRanges() function
51 * with which it returns the address ranges it is interested in. An extra
52 * sendTiming() function is implemented which takes an delay. In this way the
53 * device can immediatly call sendTiming(pkt, time) after processing a request
54 * and the request will be handled by the port even if the port bus the device
55 * connects to is blocked.
57 class PioPort : public Port
60 /** The device that this port serves. */
63 /** The platform that device/port are in. This is used to select which mode
64 * we are currently operating in. */
67 /** A list of outgoing timing response packets that haven't been serviced
69 std::list<Packet*> transmitList;
71 /** The current status of the peer(bus) that we are connected to. */
74 virtual bool recvTiming(Packet *pkt);
76 virtual Tick recvAtomic(Packet *pkt);
78 virtual void recvFunctional(Packet *pkt) ;
80 virtual void recvStatusChange(Status status)
81 { peerStatus = status; }
83 virtual void getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop);
86 * This class is used to implemented sendTiming() with a delay. When a delay
87 * is requested a new event is created. When the event time expires it
88 * attempts to send the packet. If it cannot, the packet is pushed onto the
89 * transmit list to be sent when recvRetry() is called. */
90 class SendEvent : public Event
95 SendEvent(PioPort *p, Packet *pkt, Tick t)
96 : Event(&mainEventQueue), port(p), packet(pkt)
97 { schedule(curTick + t); }
99 virtual void process();
101 virtual const char *description()
102 { return "Future scheduled sendTiming event"; }
104 friend class PioPort;
107 /** Schedule a sendTiming() event to be called in the future. */
108 void sendTiming(Packet *pkt, Tick time)
109 { new PioPort::SendEvent(this, pkt, time); }
111 /** This function is notification that the device should attempt to send a
113 virtual void recvRetry();
116 PioPort(PioDevice *dev, Platform *p);
118 friend class PioPort::SendEvent;
122 struct DmaReqState : public Packet::SenderState
124 /** Event to call on the device when this transaction (all packets)
126 Event *completionEvent;
128 /** Where we came from for some sanity checking. */
131 /** Total number of bytes that this transaction involves. */
134 /** Number of bytes that have been acked for this transaction. */
138 DmaReqState(Event *ce, Port *p, Addr tb)
139 : completionEvent(ce), outPort(p), totBytes(tb), numBytes(0)
143 class DmaPort : public Port
147 std::list<Packet*> transmitList;
149 /** The platform that device/port are in. This is used to select which mode
150 * we are currently operating in. */
153 /** Number of outstanding packets the dma port has. */
156 virtual bool recvTiming(Packet *pkt);
157 virtual Tick recvAtomic(Packet *pkt)
158 { panic("dma port shouldn't be used for pio access."); }
159 virtual void recvFunctional(Packet *pkt)
160 { panic("dma port shouldn't be used for pio access."); }
162 virtual void recvStatusChange(Status status)
165 virtual void recvRetry() ;
167 virtual void getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop)
168 { resp.clear(); snoop.clear(); }
170 void sendDma(Packet *pkt, bool front = false);
173 DmaPort(DmaDevice *dev, Platform *p);
175 void dmaAction(Packet::Command cmd, Addr addr, int size, Event *event,
176 uint8_t *data = NULL);
178 bool dmaPending() { return pendingCount > 0; }
183 * This device is the base class which all devices senstive to an address range
184 * inherit from. There are three pure virtual functions which all devices must
185 * implement addressRanges(), read(), and write(). The magic do choose which
186 * mode we are in, etc is handled by the PioPort so the device doesn't have to
190 class PioDevice : public MemObject
194 /** The platform we are in. This is used to decide what type of memory
195 * transaction we should perform. */
198 /** The pioPort that handles the requests for us and provides us requests
202 virtual void addressRanges(AddrRangeList &range_list) = 0;
204 /** As far as the devices are concerned they only accept atomic transactions
205 * which are converted to either a write or a read. */
206 Tick recvAtomic(Packet *pkt)
207 { return pkt->isRead() ? this->read(pkt) : this->write(pkt); }
209 /** Pure virtual function that the device must implement. Called when a read
210 * 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(Packet *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(Packet *pkt) = 0;
224 /** Params struct which is extended through each device based on the
225 * parameters it needs. Since we are re-writing everything, we might as well
226 * start from the bottom this time. */
239 const Params *params() const { return _params; }
242 : MemObject(p->name), platform(p->platform), pioPort(NULL),
246 virtual ~PioDevice();
250 virtual Port *getPort(const std::string &if_name, int idx = -1)
252 if (if_name == "pio") {
254 panic("pio port already connected to.");
255 pioPort = new PioPort(this, params()->platform);
260 friend class PioPort;
264 class BasicPioDevice : public PioDevice
267 struct Params : public PioDevice::Params
274 /** Address that the device listens to. */
277 /** Size that the device's address range. */
280 /** Delay that the device experinces on an access. */
284 BasicPioDevice(Params *p)
285 : PioDevice(p), pioAddr(p->pio_addr), pioSize(0), pioDelay(p->pio_delay)
288 /** return the address ranges that this device responds to.
289 * @params range_list range list to populate with ranges
291 void addressRanges(AddrRangeList &range_list);
295 class DmaDevice : public PioDevice
301 DmaDevice(Params *p);
302 virtual ~DmaDevice();
304 void dmaWrite(Addr addr, int size, Event *event, uint8_t *data)
305 { dmaPort->dmaAction(Packet::WriteReq, addr, size, event, data) ; }
307 void dmaRead(Addr addr, int size, Event *event, uint8_t *data = NULL)
308 { dmaPort->dmaAction(Packet::ReadReq, addr, size, event, data); }
310 bool dmaPending() { return dmaPort->dmaPending(); }
312 virtual Port *getPort(const std::string &if_name, int idx = -1)
314 if (if_name == "pio") {
316 panic("pio port already connected to.");
317 pioPort = new PioPort(this, params()->platform);
319 } else if (if_name == "dma") {
321 panic("dma port already connected to.");
322 dmaPort = new DmaPort(this, params()->platform);
328 friend class DmaPort;
332 #endif // __DEV_IO_DEVICE_HH__