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
|
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#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&, u64, UserOrKernelBuffer&, size_t) override;
virtual bool can_write(const FileDescription&, size_t) const override;
virtual KResultOr<size_t> write(FileDescription&, u64, 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
};
// ^Device
virtual mode_t required_mode() const override { return 0620; }
virtual String device_name() const override;
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;
};
}
|
