dev/uart.cc

   1 /*
   2  * Copyright (c) 2004 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /** @file
  30  * Implements a 8250 UART
  31  */
  32
  33 #include <string>
  34 #include <vector>
  35
  36 #include "base/inifile.hh"
  37 #include "base/str.hh"        // for to_number
  38 #include "base/trace.hh"
  39 #include "dev/simconsole.hh"
  40 #include "dev/uart.hh"
  41 #include "dev/platform.hh"
  42 #include "mem/bus/bus.hh"
  43 #include "mem/bus/pio_interface.hh"
  44 #include "mem/bus/pio_interface_impl.hh"
  45 #include "mem/functional/memory_control.hh"
  46 #include "sim/builder.hh"
  47
  48 using namespace std;
  49
  50 Uart::Uart(const string &name, SimConsole *c, MemoryController *mmu, Addr a,
  51            Addr s, HierParams *hier, Bus *bus, Tick pio_latency, Platform *p)
  52     : PioDevice(name, p), addr(a), size(s), cons(c)
  53 {
  54     mmu->add_child(this, RangeSize(addr, size));
  55
  56
  57     if (bus) {
  58         pioInterface = newPioInterface(name, hier, bus, this,
  59                                       &Uart::cacheAccess);
  60         pioInterface->addAddrRange(RangeSize(addr, size));
  61         pioLatency = pio_latency * bus->clockRate;
  62     }
  63
  64     status = 0;
  65
  66     // set back pointers
  67     cons->uart = this;
  68     platform->uart = this;
  69 }
  70
  71 Tick
  72 Uart::cacheAccess(MemReqPtr &req)
  73 {
  74     return curTick + pioLatency;
  75 }
  76
  77 DEFINE_SIM_OBJECT_CLASS_NAME("Uart", Uart)
  78