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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