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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <Kernel/Devices/CharacterDevice.h>
#include <Kernel/IO.h>
namespace Kernel {
class SerialDevice final : public CharacterDevice {
AK_MAKE_ETERNAL
public:
static NonnullRefPtr<SerialDevice> must_create(size_t com_number);
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;
void put_char(char);
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:
friend class PCISerialDevice;
SerialDevice(IOAddress base_addr, unsigned minor);
// ^CharacterDevice
virtual StringView class_name() const override { return "SerialDevice"; }
void initialize();
void set_interrupts(bool interrupt_enable);
void set_baud(Baud);
void set_fifo_control(u8 fifo_control);
void set_line_control(ParitySelect, StopBits, WordLength);
void set_break_enable(bool break_enable);
void set_modem_control(u8 modem_control);
u8 get_line_status() const;
IOAddress m_base_addr;
bool m_interrupt_enable { false };
u8 m_fifo_control { 0 };
Baud m_baud { Baud38400 };
ParitySelect m_parity_select { None };
StopBits m_stop_bits { One };
WordLength m_word_length { EightBits };
bool m_break_enable { false };
u8 m_modem_control { 0 };
bool m_last_put_char_was_carriage_return { false };
SpinLock<u8> m_serial_lock;
};
}
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