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 maximum number of ports we ever try to use. */ 27 #define SERIAL_MAX_PORTS 4 28 29 /* The offsets of UART registers. */ 30 #define UART_TX 0 31 #define UART_RX 0 32 #define UART_DLL 0 33 #define UART_IER 1 34 #define UART_DLH 1 35 #define UART_IIR 2 36 #define UART_FCR 2 37 #define UART_LCR 3 38 #define UART_MCR 4 39 #define UART_LSR 5 40 #define UART_MSR 6 41 #define UART_SR 7 42 43 /* For LSR bits. */ 44 #define UART_DATA_READY 0x01 45 #define UART_EMPTY_TRANSMITTER 0x20 46 47 /* The type of parity. */ 48 #define UART_NO_PARITY 0x00 49 #define UART_ODD_PARITY 0x08 50 #define UART_EVEN_PARITY 0x18 51 52 /* The type of word length. */ 53 #define UART_5BITS_WORD 0x00 54 #define UART_6BITS_WORD 0x01 55 #define UART_7BITS_WORD 0x02 56 #define UART_8BITS_WORD 0x03 57 58 /* The type of the length of stop bit. */ 59 #define UART_1_STOP_BIT 0x00 60 #define UART_2_STOP_BITS 0x04 61 62 /* the switch of DLAB. */ 63 #define UART_DLAB 0x80 64 65 /* Enable the FIFO. */ 66 #define UART_ENABLE_FIFO 0xC7 67 68 /* Turn on DTR, RTS, and OUT2. */ 69 #define UART_ENABLE_MODEM 0x0B 70 71 /* Arbitrary pattern to write during existence testing. */ 72 #define UART_SR_TEST 0x4F 73 74 75 /* Function prototypes. */ 76 77 /* Fetch a key. */ 78 int serial_hw_fetch (void); 79 80 /* Put a character. */ 81 void serial_hw_put (int c); 82 83 /* Insert a delay. */ 84 void serial_hw_delay (void); 85 86 /* Return the port number for the UNITth serial device. */ 87 unsigned short serial_hw_get_port (int unit); 88 89 /* Initialize a serial device. */ 90 int serial_hw_init (unsigned short port, unsigned int speed, 91 int word_len, int parity, int stop_bit_len); 92 93 #ifdef GRUB_UTIL 94 /* Set the file name of a serial device (or a pty device). This is a 95 function specific to the grub shell. */ 96 void serial_set_device (const char *device); 97 #endif /* GRUB_UTIL */ 98 99 #endif /* ! GRUB_SERIAL_HEADER */ 100