i8254.hh revision 7903:7fcfb515d7bf 
1/*
2 * Copyright (c) 2008 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 * Authors: Gabe Black
29 */
30
31#ifndef __DEV_X86_I8254_HH__
32#define __DEV_X86_I8254_HH__
33
34#include "dev/intel_8254_timer.hh"
35#include "dev/io_device.hh"
36#include "params/I8254.hh"
37
38namespace X86ISA
39{
40
41class IntSourcePin;
42
43class I8254 : public BasicPioDevice
44{
45  protected:
46    Tick latency;
47    class X86Intel8254Timer : public Intel8254Timer
48    {
49      protected:
50        I8254 * parent;
51
52        void
53        counterInterrupt(unsigned int num)
54        {
55            parent->counterInterrupt(num);
56        }
57
58      public:
59        X86Intel8254Timer(const std::string &name, I8254 * _parent) :
60            Intel8254Timer(_parent, name), parent(_parent)
61        {}
62    };
63
64
65    X86Intel8254Timer pit;
66
67    IntSourcePin *intPin;
68
69    void counterInterrupt(unsigned int num);
70
71  public:
72    typedef I8254Params Params;
73
74    const Params *
75    params() const
76    {
77        return dynamic_cast<const Params *>(_params);
78    }
79
80    I8254(Params *p) : BasicPioDevice(p), latency(p->pio_latency),
81            pit(p->name, this), intPin(p->int_pin)
82    {
83        pioSize = 4;
84    }
85    Tick read(PacketPtr pkt);
86
87    Tick write(PacketPtr pkt);
88
89    bool
90    outputHigh(unsigned int num)
91    {
92        return pit.outputHigh(num);
93    }
94
95    uint8_t
96    readCounter(unsigned int num)
97    {
98        return pit.readCounter(num);
99    }
100
101    void
102    writeCounter(unsigned int num, const uint8_t data)
103    {
104        pit.writeCounter(num, data);
105    }
106
107    void
108    writeControl(uint8_t val)
109    {
110        pit.writeControl(val);
111    }
112
113    virtual void serialize(std::ostream &os);
114    virtual void unserialize(Checkpoint *cp, const std::string &section);
115
116};
117
118} // namespace X86ISA
119
120#endif //__DEV_X86_SOUTH_BRIDGE_I8254_HH__
121