1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <Kernel/Devices/CharacterDevice.h>
namespace Kernel {
#define SERIAL_COM1_ADDR 0x3F8
#define SERIAL_COM2_ADDR 0x2F8
#define SERIAL_COM3_ADDR 0x3E8
#define SERIAL_COM4_ADDR 0x2E8
class SerialDevice final : public CharacterDevice {
AK_MAKE_ETERNAL
public:
SerialDevice(int base_addr, unsigned minor);
virtual ~SerialDevice() override;
// ^CharacterDevice
virtual bool can_read(const FileDescription&, size_t) const override;
virtual KResultOr<size_t> read(FileDescription&, size_t, UserOrKernelBuffer&, size_t) override;
virtual bool can_write(const FileDescription&, size_t) const override;
virtual KResultOr<size_t> write(FileDescription&, size_t, const UserOrKernelBuffer&, size_t) override;
enum InterruptEnable {
LowPowerMode = 0x01 << 5,
SleepMode = 0x01 << 4,
ModemStatusInterrupt = 0x01 << 3,
ReceiverLineStatusInterrupt = 0x01 << 2,
TransmitterHoldingRegisterEmptyInterrupt = 0x01 << 1,
ReceivedDataAvailableInterrupt = 0x01 << 0
};
enum Baud {
Baud50 = 2304,
Baud110 = 1047,
Baud220 = 524,
Baud300 = 384,
Baud600 = 192,
Baud1200 = 96,
Baud2400 = 48,
Baud4800 = 24,
Baud9600 = 12,
Baud19200 = 6,
Baud38400 = 3,
Baud57600 = 2,
Baud115200 = 1
};
enum ParitySelect {
None = 0x00 << 3,
Odd = 0x01 << 3,
Even = 0x03 << 3,
Mark = 0x05 << 3,
Space = 0x07 << 3
};
enum StopBits {
One = 0x00 << 2,
Two = 0x01 << 2
};
enum WordLength {
FiveBits = 0x00,
SixBits = 0x01,
SevenBits = 0x02,
EightBits = 0x03
};
enum FIFOControl {
EnableFIFO = 0x01 << 0,
ClearReceiveFIFO = 0x01 << 1,
ClearTransmitFIFO = 0x01 << 2,
Enable64ByteFIFO = 0x01 << 5,
TriggerLevel1 = 0x00 << 6,
TriggerLevel2 = 0x01 << 6,
TriggerLevel3 = 0x02 << 6,
TriggerLevel4 = 0x03 << 6
};
enum ModemControl {
AutoflowControlEnabled = 0x01 << 5,
LoopbackMode = 0x01 << 4,
AuxiliaryOutput2 = 0x01 << 3,
AuxiliaryOutput1 = 0x01 << 2,
RequestToSend = 0x01 << 1,
DataTerminalReady = 0x01 << 0
};
enum LineStatus {
ErrorInReceivedFIFO = 0x01 << 7,
EmptyDataHoldingRegisters = 0x01 << 6,
EmptyTransmitterHoldingRegister = 0x01 << 5,
BreakInterrupt = 0x01 << 4,
FramingError = 0x01 << 3,
ParityError = 0x01 << 2,
OverrunError = 0x01 << 1,
DataReady = 0x01 << 0
};
private:
// ^CharacterDevice
virtual const char* class_name() const override { return "SerialDevice"; }
void initialize();
void set_interrupts(char interrupt_enable);
void set_baud(Baud);
void set_fifo_control(char fifo_control);
void set_line_control(ParitySelect, StopBits, WordLength);
void set_break_enable(bool break_enable);
void set_modem_control(char modem_control);
char get_line_status() const;
bool rx_ready();
bool tx_ready();
int m_base_addr;
char m_interrupt_enable;
char m_fifo_control;
Baud m_baud;
ParitySelect m_parity_select;
StopBits m_stop_bits;
WordLength m_word_length;
bool m_break_enable;
char m_modem_control;
};
}
|
