93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
/* serial.h - serial device interface */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2000,2001,2002,2005,2007 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef GRUB_NS8250_HEADER
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#define GRUB_NS8250_HEADER 1
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/* Macros. */
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/* The offsets of UART registers. */
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#define UART_TX 0
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#define UART_RX 0
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#define UART_DLL 0
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#define UART_IER 1
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#define UART_DLH 1
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#define UART_IIR 2
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#define UART_FCR 2
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#define UART_LCR 3
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#define UART_MCR 4
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#define UART_LSR 5
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#define UART_MSR 6
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#define UART_SR 7
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/* For LSR bits. */
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#define UART_DATA_READY 0x01
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#define UART_EMPTY_TRANSMITTER 0x20
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/* The type of parity. */
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#define UART_NO_PARITY 0x00
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#define UART_ODD_PARITY 0x08
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#define UART_EVEN_PARITY 0x18
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/* The type of word length. */
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#define UART_5BITS_WORD 0x00
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#define UART_6BITS_WORD 0x01
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#define UART_7BITS_WORD 0x02
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#define UART_8BITS_WORD 0x03
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/* The type of the length of stop bit. */
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#define UART_1_STOP_BIT 0x00
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#define UART_2_STOP_BITS 0x04
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/* the switch of DLAB. */
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#define UART_DLAB 0x80
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/* Enable the FIFO. */
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#define UART_ENABLE_FIFO_TRIGGER14 0xC7
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/* Enable the FIFO. */
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#define UART_ENABLE_FIFO_TRIGGER1 0x07
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/* Turn on DTR, RTS, and OUT2. */
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#define UART_ENABLE_DTRRTS 0x03
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/* Turn on DTR, RTS, and OUT2. */
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#define UART_ENABLE_OUT2 0x08
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/*
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* Default clock input of the UART (feeds the baud rate generator).
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*
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* The standard value here is 1.8432 MHz, which corresponds to
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* 115200 bauds * 16 (16 times oversampling).
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*
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*/
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#ifdef GRUB_MACHINE_MIPS_LOONGSON
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#define UART_DEFAULT_BASE_CLOCK ((2 * 115200) << 4)
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#else
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#define UART_DEFAULT_BASE_CLOCK (115200 << 4)
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#endif
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#ifndef ASM_FILE
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#include <grub/cpu/io.h>
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grub_port_t
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grub_ns8250_hw_get_port (const unsigned int unit);
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#endif
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#endif /* ! GRUB_SERIAL_MACHINE_HEADER */
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