io_device.cc revision 13784:1941dc118243 
1/*
2 * Copyright (c) 2012, 2015 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 "dev/io_device.hh"
45
46#include "base/trace.hh"
47#include "debug/AddrRanges.hh"
48#include "sim/system.hh"
49
50PioPort::PioPort(PioDevice *dev)
51    : SimpleTimingPort(dev->name() + ".pio", dev), device(dev)
52{
53}
54
55Tick
56PioPort::recvAtomic(PacketPtr pkt)
57{
58    // technically the packet only reaches us after the header delay,
59    // and typically we also need to deserialise any payload
60    Tick receive_delay = pkt->headerDelay + pkt->payloadDelay;
61    pkt->headerDelay = pkt->payloadDelay = 0;
62
63    const Tick delay(pkt->isRead() ? device->read(pkt) : device->write(pkt));
64    assert(pkt->isResponse() || pkt->isError());
65    return delay + receive_delay;
66}
67
68AddrRangeList
69PioPort::getAddrRanges() const
70{
71    return device->getAddrRanges();
72}
73
74PioDevice::PioDevice(const Params *p)
75    : MemObject(p), sys(p->system), pioPort(this)
76{}
77
78PioDevice::~PioDevice()
79{
80}
81
82void
83PioDevice::init()
84{
85    if (!pioPort.isConnected())
86        panic("Pio port of %s not connected to anything!", name());
87    pioPort.sendRangeChange();
88}
89
90Port &
91PioDevice::getPort(const std::string &if_name, PortID idx)
92{
93    if (if_name == "pio") {
94        return pioPort;
95    }
96    return MemObject::getPort(if_name, idx);
97}
98
99BasicPioDevice::BasicPioDevice(const Params *p, Addr size)
100    : PioDevice(p), pioAddr(p->pio_addr), pioSize(size),
101      pioDelay(p->pio_latency)
102{}
103
104AddrRangeList
105BasicPioDevice::getAddrRanges() const
106{
107    assert(pioSize != 0);
108    AddrRangeList ranges;
109    DPRINTF(AddrRanges, "registering range: %#x-%#x\n", pioAddr, pioSize);
110    ranges.push_back(RangeSize(pioAddr, pioSize));
111    return ranges;
112}
113