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/* serial.h - serial device interface */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2000,2001,2002 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef GRUB_SERIAL_HEADER
#define GRUB_SERIAL_HEADER 1
/* Macros. */
/* The offsets of UART registers. */
#define UART_TX 0
#define UART_RX 0
#define UART_DLL 0
#define UART_IER 1
#define UART_DLH 1
#define UART_IIR 2
#define UART_FCR 2
#define UART_LCR 3
#define UART_MCR 4
#define UART_LSR 5
#define UART_MSR 6
#define UART_SR 7
/* For LSR bits. */
#define UART_DATA_READY 0x01
#define UART_EMPTY_TRANSMITTER 0x20
/* The type of parity. */
#define UART_NO_PARITY 0x00
#define UART_ODD_PARITY 0x08
#define UART_EVEN_PARITY 0x18
/* The type of word length. */
#define UART_5BITS_WORD 0x00
#define UART_6BITS_WORD 0x01
#define UART_7BITS_WORD 0x02
#define UART_8BITS_WORD 0x03
/* The type of the length of stop bit. */
#define UART_1_STOP_BIT 0x00
#define UART_2_STOP_BITS 0x04
/* the switch of DLAB. */
#define UART_DLAB 0x80
/* Enable the FIFO. */
#define UART_ENABLE_FIFO 0xC7
/* Turn on DTR, RTS, and OUT2. */
#define UART_ENABLE_MODEM 0x0B
/* Function prototypes. */
/* Fetch a key. */
int serial_hw_fetch (void);
/* Put a character. */
void serial_hw_put (int c);
/* Insert a delay. */
void serial_hw_delay (void);
/* Return the port number for the UNITth serial device. */
unsigned short serial_hw_get_port (int unit);
/* Initialize a serial device. */
int serial_hw_init (unsigned short port, unsigned int speed,
int word_len, int parity, int stop_bit_len);
#ifdef GRUB_UTIL
/* Set the file name of a serial device (or a pty device). This is a
function specific to the grub shell. */
void serial_set_device (const char *device);
#endif /* GRUB_UTIL */
#endif /* ! GRUB_SERIAL_HEADER */
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