io_device.cc revision 10603:6099331da328 
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/AddrRanges.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    // @todo: We need to pay for this and not just zero it out
58    pkt->firstWordDelay = pkt->lastWordDelay = 0;
59
60    const Tick delay(pkt->isRead() ? device->read(pkt) : device->write(pkt));
61    assert(pkt->isResponse() || pkt->isError());
62    return delay;
63}
64
65AddrRangeList
66PioPort::getAddrRanges() const
67{
68    return device->getAddrRanges();
69}
70
71PioDevice::PioDevice(const Params *p)
72    : MemObject(p), sys(p->system), pioPort(this)
73{}
74
75PioDevice::~PioDevice()
76{
77}
78
79void
80PioDevice::init()
81{
82    if (!pioPort.isConnected())
83        panic("Pio port of %s not connected to anything!", name());
84    pioPort.sendRangeChange();
85}
86
87BaseSlavePort &
88PioDevice::getSlavePort(const std::string &if_name, PortID idx)
89{
90    if (if_name == "pio") {
91        return pioPort;
92    }
93    return MemObject::getSlavePort(if_name, idx);
94}
95
96unsigned int
97PioDevice::drain(DrainManager *dm)
98{
99    unsigned int count;
100    count = pioPort.drain(dm);
101    if (count)
102        setDrainState(Drainable::Draining);
103    else
104        setDrainState(Drainable::Drained);
105    return count;
106}
107
108BasicPioDevice::BasicPioDevice(const Params *p, Addr size)
109    : PioDevice(p), pioAddr(p->pio_addr), pioSize(size),
110      pioDelay(p->pio_latency)
111{}
112
113AddrRangeList
114BasicPioDevice::getAddrRanges() const
115{
116    assert(pioSize != 0);
117    AddrRangeList ranges;
118    DPRINTF(AddrRanges, "registering range: %#x-%#x\n", pioAddr, pioSize);
119    ranges.push_back(RangeSize(pioAddr, pioSize));
120    return ranges;
121}
122