src/dev/io_device.cc

   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
  49 PioPort::PioPort(PioDevice *dev)
  50     : SimpleTimingPort(dev->name() + "-pio", dev), device(dev)
  51 {
  52 }
  53
  54 Tick
  55 PioPort::recvAtomic(PacketPtr pkt)
  56 {
  57     return pkt->isRead() ? device->read(pkt) : device->write(pkt);
  58 }
  59
  60 AddrRangeList
  61 PioPort::getAddrRanges() const
  62 {
  63     return device->getAddrRanges();
  64 }
  65
  66 PioDevice::PioDevice(const Params *p)
  67     : MemObject(p), sys(p->system), pioPort(this)
  68 {}
  69
  70 PioDevice::~PioDevice()
  71 {
  72 }
  73
  74 void
  75 PioDevice::init()
  76 {
  77     if (!pioPort.isConnected())
  78         panic("Pio port of %s not connected to anything!", name());
  79     pioPort.sendRangeChange();
  80 }
  81
  82 SlavePort &
  83 PioDevice::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
  91 unsigned int
  92 PioDevice::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
 103 BasicPioDevice::BasicPioDevice(const Params *p)
 104     : PioDevice(p), pioAddr(p->pio_addr), pioSize(0),
 105       pioDelay(p->pio_latency)
 106 {}
 107
 108 AddrRangeList
 109 BasicPioDevice::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 }