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

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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.
61 */
62class PioPort : public SimpleTimingPort
63{
64 protected:
65 /** The device that this port serves. */
66 PioDevice *device;
67
68 virtual Tick recvAtomic(PacketPtr pkt);
69
70 virtual AddrRangeList getAddrRanges() const;
71
72 public:
73
74 PioPort(PioDevice *dev);
75};
76
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 ClockedObject
85{
86 protected:
87 System *sys;
88
89 /** The pioPort that handles the requests for us and provides us requests
90 * that it sees. */
91 PioPort pioPort;
92
93 /**
94 * Every PIO device is obliged to provide an implementation that
95 * returns the address ranges the device responds to.
96 *
97 * @return a list of non-overlapping address ranges
98 */
99 virtual AddrRangeList getAddrRanges() const = 0;

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123 return dynamic_cast<const Params *>(_params);
124 }
125
126 void init() override;
127
128 Port &getPort(const std::string &if_name,
129 PortID idx=InvalidPortID) override;
130
131 friend class PioPort;
132
133};
134
135class BasicPioDevice : public PioDevice
136{
137 protected:
138 /** Address that the device listens to. */
139 Addr pioAddr;

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154 return dynamic_cast<const Params *>(_params);
155 }
156
157 /**
158 * Determine the address ranges that this device responds to.
159 *
160 * @return a list of non-overlapping address ranges
161 */
162 virtual AddrRangeList getAddrRanges() const;
163
164};
165
166#endif // __DEV_IO_DEVICE_HH__