1/* 2 * Copyright (c) 2012 ARM Limited 3 * All rights reserved. 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software
--- 30 unchanged lines hidden (view full) ---
39 * 40 * Authors: Ali Saidi 41 * Nathan Binkert 42 */ 43 44#ifndef __DEV_IO_DEVICE_HH__ 45#define __DEV_IO_DEVICE_HH__ 46
|
47#include "base/fast_alloc.hh"
|
47#include "mem/mem_object.hh"
|
49#include "mem/packet.hh"
|
48#include "mem/tport.hh" 49#include "params/BasicPioDevice.hh"
|
52#include "params/DmaDevice.hh"
|
50#include "params/PioDevice.hh"
|
54#include "sim/sim_object.hh"
|
51
|
56class Event;
|
52class PioDevice;
|
58class DmaDevice;
|
53class System; 54 55/** 56 * The PioPort class is a programmed i/o port that all devices that are 57 * sensitive to an address range use. The port takes all the memory 58 * access types and roles them into one read() and write() call that the device 59 * must respond to. The device must also provide getAddrRanges() function 60 * with which it returns the address ranges it is interested in.
--- 8 unchanged lines hidden (view full) ---
69 70 virtual AddrRangeList getAddrRanges(); 71 72 public: 73 74 PioPort(PioDevice *dev); 75}; 76
|
83
84class DmaPort : public MasterPort
85{
86 protected:
87 struct DmaReqState : public Packet::SenderState, public FastAlloc
88 {
89 /** Event to call on the device when this transaction (all packets)
90 * complete. */
91 Event *completionEvent;
92
93 /** Where we came from for some sanity checking. */
94 Port *outPort;
95
96 /** Total number of bytes that this transaction involves. */
97 Addr totBytes;
98
99 /** Number of bytes that have been acked for this transaction. */
100 Addr numBytes;
101
102 /** Amount to delay completion of dma by */
103 Tick delay;
104
105
106 DmaReqState(Event *ce, Port *p, Addr tb, Tick _delay)
107 : completionEvent(ce), outPort(p), totBytes(tb), numBytes(0),
108 delay(_delay)
109 {}
110 };
111
112 MemObject *device;
113 std::list<PacketPtr> transmitList;
114
115 /** The system that device/port are in. This is used to select which mode
116 * we are currently operating in. */
117 System *sys;
118
119 /** Id for all requests */
120 MasterID masterId;
121
122 /** Number of outstanding packets the dma port has. */
123 int pendingCount;
124
125 /** If a dmaAction is in progress. */
126 int actionInProgress;
127
128 /** If we need to drain, keep the drain event around until we're done
129 * here.*/
130 Event *drainEvent;
131
132 /** time to wait between sending another packet, increases as NACKs are
133 * recived, decreases as responses are recived. */
134 Tick backoffTime;
135
136 /** Minimum time that device should back off for after failed sendTiming */
137 Tick minBackoffDelay;
138
139 /** Maximum time that device should back off for after failed sendTiming */
140 Tick maxBackoffDelay;
141
142 /** If the port is currently waiting for a retry before it can send whatever
143 * it is that it's sending. */
144 bool inRetry;
145
146 virtual bool recvTimingResp(PacketPtr pkt);
147
148 virtual void recvRetry() ;
149
150 void queueDma(PacketPtr pkt, bool front = false);
151 void sendDma();
152
153 /** event to give us a kick every time we backoff time is reached. */
154 EventWrapper<DmaPort, &DmaPort::sendDma> backoffEvent;
155
156 public:
157 DmaPort(MemObject *dev, System *s, Tick min_backoff, Tick max_backoff);
158
159 void dmaAction(Packet::Command cmd, Addr addr, int size, Event *event,
160 uint8_t *data, Tick delay, Request::Flags flag = 0);
161
162 bool dmaPending() { return pendingCount > 0; }
163
164 unsigned cacheBlockSize() const { return peerBlockSize(); }
165 unsigned int drain(Event *de);
166};
167
|
77/** 78 * This device is the base class which all devices senstive to an address range 79 * inherit from. There are three pure virtual functions which all devices must 80 * implement getAddrRanges(), read(), and write(). The magic do choose which 81 * mode we are in, etc is handled by the PioPort so the device doesn't have to 82 * bother. 83 */ 84class PioDevice : public MemObject
--- 74 unchanged lines hidden (view full) ---
159 * Determine the address ranges that this device responds to. 160 * 161 * @return a list of non-overlapping address ranges 162 */ 163 virtual AddrRangeList getAddrRanges(); 164 165}; 166
|
258class DmaDevice : public PioDevice
259{
260 protected:
261 DmaPort dmaPort;
262
263 public:
264 typedef DmaDeviceParams Params;
265 DmaDevice(const Params *p);
266 virtual ~DmaDevice();
267
268 const Params *
269 params() const
270 {
271 return dynamic_cast<const Params *>(_params);
272 }
273
274 void dmaWrite(Addr addr, int size, Event *event, uint8_t *data,
275 Tick delay = 0)
276 {
277 dmaPort.dmaAction(MemCmd::WriteReq, addr, size, event, data, delay);
278 }
279
280 void dmaRead(Addr addr, int size, Event *event, uint8_t *data,
281 Tick delay = 0)
282 {
283 dmaPort.dmaAction(MemCmd::ReadReq, addr, size, event, data, delay);
284 }
285
286 bool dmaPending() { return dmaPort.dmaPending(); }
287
288 virtual void init();
289
290 virtual unsigned int drain(Event *de);
291
292 unsigned cacheBlockSize() const { return dmaPort.cacheBlockSize(); }
293
294 virtual MasterPort &getMasterPort(const std::string &if_name,
295 int idx = -1);
296
297 friend class DmaPort;
298};
299
300
|
167#endif // __DEV_IO_DEVICE_HH__
|