1 /* serial.h - serial device interface */ 2 /* 3 * GRUB -- GRand Unified Bootloader 4 * Copyright (C) 2000,2001,2002 Free Software Foundation, Inc. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19 */ 20 21 #ifndef GRUB_SERIAL_HEADER 22 #define GRUB_SERIAL_HEADER 1 23 24 /* Macros. */ 25 26 /* The offsets of UART registers. */ 27 #define UART_TX 0 28 #define UART_RX 0 29 #define UART_DLL 0 30 #define UART_IER 1 31 #define UART_DLH 1 32 #define UART_IIR 2 33 #define UART_FCR 2 34 #define UART_LCR 3 35 #define UART_MCR 4 36 #define UART_LSR 5 37 #define UART_MSR 6 38 #define UART_SR 7 39 40 /* For LSR bits. */ 41 #define UART_DATA_READY 0x01 42 #define UART_EMPTY_TRANSMITTER 0x20 43 44 /* The type of parity. */ 45 #define UART_NO_PARITY 0x00 46 #define UART_ODD_PARITY 0x08 47 #define UART_EVEN_PARITY 0x18 48 49 /* The type of word length. */ 50 #define UART_5BITS_WORD 0x00 51 #define UART_6BITS_WORD 0x01 52 #define UART_7BITS_WORD 0x02 53 #define UART_8BITS_WORD 0x03 54 55 /* The type of the length of stop bit. */ 56 #define UART_1_STOP_BIT 0x00 57 #define UART_2_STOP_BITS 0x04 58 59 /* the switch of DLAB. */ 60 #define UART_DLAB 0x80 61 62 /* Enable the FIFO. */ 63 #define UART_ENABLE_FIFO 0xC7 64 65 /* Turn on DTR, RTS, and OUT2. */ 66 #define UART_ENABLE_MODEM 0x0B 67 68 69 /* Function prototypes. */ 70 71 /* Fetch a key. */ 72 int serial_hw_fetch (void); 73 74 /* Put a character. */ 75 void serial_hw_put (int c); 76 77 /* Insert a delay. */ 78 void serial_hw_delay (void); 79 80 /* Return the port number for the UNITth serial device. */ 81 unsigned short serial_hw_get_port (int unit); 82 83 /* Initialize a serial device. */ 84 int serial_hw_init (unsigned short port, unsigned int speed, 85 int word_len, int parity, int stop_bit_len); 86 87 #ifdef GRUB_UTIL 88 /* Set the file name of a serial device (or a pty device). This is a 89 function specific to the grub shell. */ 90 void serial_set_device (const char *device); 91 #endif /* GRUB_UTIL */ 92 93 #endif /* ! GRUB_SERIAL_HEADER */ 94