io_device.cc revision 9095:0e6bd7082fac 
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
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2006 The Regents of The University of Michigan
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Ali Saidi
41 *          Nathan Binkert
42 */
43
44#include "base/trace.hh"
45#include "debug/BusAddrRanges.hh"
46#include "dev/io_device.hh"
47#include "sim/system.hh"
48
49PioPort::PioPort(PioDevice *dev)
50    : SimpleTimingPort(dev->name() + ".pio", dev), device(dev)
51{
52}
53
54Tick
55PioPort::recvAtomic(PacketPtr pkt)
56{
57    return pkt->isRead() ? device->read(pkt) : device->write(pkt);
58}
59
60AddrRangeList
61PioPort::getAddrRanges() const
62{
63    return device->getAddrRanges();
64}
65
66PioDevice::PioDevice(const Params *p)
67    : MemObject(p), sys(p->system), pioPort(this)
68{}
69
70PioDevice::~PioDevice()
71{
72}
73
74void
75PioDevice::init()
76{
77    if (!pioPort.isConnected())
78        panic("Pio port of %s not connected to anything!", name());
79    pioPort.sendRangeChange();
80}
81
82SlavePort &
83PioDevice::getSlavePort(const std::string &if_name, int idx)
84{
85    if (if_name == "pio") {
86        return pioPort;
87    }
88    return MemObject::getSlavePort(if_name, idx);
89}
90
91unsigned int
92PioDevice::drain(Event *de)
93{
94    unsigned int count;
95    count = pioPort.drain(de);
96    if (count)
97        changeState(Draining);
98    else
99        changeState(Drained);
100    return count;
101}
102
103BasicPioDevice::BasicPioDevice(const Params *p)
104    : PioDevice(p), pioAddr(p->pio_addr), pioSize(0),
105      pioDelay(p->pio_latency)
106{}
107
108AddrRangeList
109BasicPioDevice::getAddrRanges() const
110{
111    assert(pioSize != 0);
112    AddrRangeList ranges;
113    DPRINTF(BusAddrRanges, "registering range: %#x-%#x\n", pioAddr, pioSize);
114    ranges.push_back(RangeSize(pioAddr, pioSize));
115    return ranges;
116}
117