serial.cc revision 12239 
1/*
2 * Copyright (c) 2014, 2017 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 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: Andreas Sandberg
38 */
39
40#include "dev/serial/serial.hh"
41
42#include "base/misc.hh"
43#include "params/SerialDevice.hh"
44#include "params/SerialNullDevice.hh"
45
46SerialDevice::SerialDevice(const SerialDeviceParams *p)
47    : SimObject(p), interfaceCallback(nullptr)
48{
49}
50
51SerialDevice::~SerialDevice()
52{
53}
54
55void
56SerialDevice::regInterfaceCallback(Callback *c)
57{
58    // This can happen if the user has connected multiple UARTs to the
59    // same terminal. In that case, each of them tries to register
60    // callbacks.
61    if (interfaceCallback)
62        fatal("A UART has already been associated with this device.\n");
63    interfaceCallback = c;
64}
65
66void
67SerialDevice::notifyInterface()
68{
69    assert(dataAvailable());
70    // Registering a callback is optional.
71    if (interfaceCallback)
72        interfaceCallback->process();
73}
74
75
76
77
78SerialNullDevice::SerialNullDevice(const SerialNullDeviceParams *p)
79    : SerialDevice(p)
80{
81}
82
83uint8_t
84SerialNullDevice::readData()
85{
86    panic("SerialNullDevice does not have pending data.\n");
87}
88
89
90
91SerialNullDevice *
92SerialNullDeviceParams::create()
93{
94    return new SerialNullDevice(this);
95}
96