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52ac9c69 RG |
1 | .\" Copyright (c) 1990, 1991 The Regents of the University of California. |
2 | .\" All rights reserved. | |
3 | .\" | |
4 | .\" This code is derived from software contributed to Berkeley by | |
5 | .\" the Systems Programming Group of the University of Utah Computer | |
6 | .\" Science Department. | |
7 | .\" Redistribution and use in source and binary forms, with or without | |
8 | .\" modification, are permitted provided that the following conditions | |
9 | .\" are met: | |
10 | .\" 1. Redistributions of source code must retain the above copyright | |
11 | .\" notice, this list of conditions and the following disclaimer. | |
12 | .\" 2. Redistributions in binary form must reproduce the above copyright | |
13 | .\" notice, this list of conditions and the following disclaimer in the | |
14 | .\" documentation and/or other materials provided with the distribution. | |
15 | .\" 3. All advertising materials mentioning features or use of this software | |
16 | .\" must display the following acknowledgement: | |
17 | .\" This product includes software developed by the University of | |
18 | .\" California, Berkeley and its contributors. | |
19 | .\" 4. Neither the name of the University nor the names of its contributors | |
20 | .\" may be used to endorse or promote products derived from this software | |
21 | .\" without specific prior written permission. | |
22 | .\" | |
23 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
24 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
25 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
26 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
27 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
28 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
29 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
30 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
31 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
32 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
33 | .\" SUCH DAMAGE. | |
34 | .\" | |
35 | .\" from: @(#)dca.4 5.2 (Berkeley) 3/27/91 | |
36 | .\" from: com.4,v 1.1 1993/08/06 11:19:07 cgd Exp | |
63ec8d43 | 37 | .\" $Id: sio.4,v 1.1 1993/08/28 12:41:23 rgrimes Exp $ |
52ac9c69 | 38 | .\" |
63ec8d43 | 39 | .Dd February 9, 1994 |
52ac9c69 RG |
40 | .Dt SIO 4 i386 |
41 | .Os FreeBSD | |
42 | .Sh NAME | |
43 | .Nm sio | |
44 | .Nd | |
63ec8d43 | 45 | fast interrupt driven asynchronous serial communications interface |
52ac9c69 | 46 | .Sh SYNOPSIS |
63ec8d43 | 47 | For standard ports: |
52ac9c69 RG |
48 | .Cd "device sio0 at isa? port" \&"IO_COM1\&" tty irq 4 vector siointr |
49 | .Cd "device sio1 at isa? port" \&"IO_COM2\&" tty irq 3 vector siointr | |
50 | .Cd "device sio2 at isa? port" \&"IO_COM3\&" tty irq 5 vector siointr | |
51 | .Cd "device sio3 at isa? port" \&"IO_COM4\&" tty irq 9 vector siointr | |
63ec8d43 AC |
52 | .sp |
53 | For multiport cards: | |
54 | .Cd "options" \&"COM_MULTIPORT\&" | |
55 | .Cd "device sio4 at isa? port 0x2a0 tty irq 12 vector siointr flags 0x401" | |
56 | .Cd "device sio5 at isa? port 0x2a8 tty vector siointr flags 0x401" | |
57 | .Cd "device sio6 at isa? port 0x2b0 tty vector siointr flags 0x401" | |
58 | .Cd "device sio7 at isa? port 0x2b8 tty vector siointr flags 0x401" | |
59 | .sp | |
60 | For bidirectional use of ports: | |
61 | .Cd "options" \&"COM_BIDIR\&" | |
62 | .sp | |
63 | For control FIFO trigger: | |
64 | .Cd "options" \&"FIFO_TRIGGER=FIFO_TRIGGER_14\&" | |
65 | .sp | |
66 | Use 0x02 bit in flags field to disable FIFO on specified port. | |
52ac9c69 RG |
67 | .Sh DESCRIPTION |
68 | The | |
69 | .Nm sio | |
63ec8d43 | 70 | driver provides support for NS8250-, NS16450-, NS16550 and NS16550A-based |
52ac9c69 RG |
71 | .Tn EIA |
72 | .Tn RS-232C | |
73 | .Pf ( Tn CCITT | |
63ec8d43 | 74 | .Tn V.24 ) |
52ac9c69 | 75 | communications interfaces. The NS8250 and NS16450 have single character |
63ec8d43 | 76 | buffers, the NS16550A has a 16 character FIFO buffer. |
52ac9c69 RG |
77 | .Pp |
78 | Input and output for each line may set to one of following baud rates; | |
79 | 50, 75, 110, 134.5, 150, 300, 600, 1200, 1800, 2400, 4800, 9600, | |
63ec8d43 AC |
80 | 19200, 38400, 57600, or 115200. Your hardware may limit your baud |
81 | rate choices. | |
82 | .Pp | |
83 | For multiport cards the | |
84 | .Nm flags | |
85 | keyword in the kernel configuration file determines which port of | |
86 | your multiport card is the master device, and whether the | |
87 | port is part of a multiport card. The master device is the port with | |
88 | the shared interrupt register. | |
89 | All ports of a multiport card report | |
90 | pending interrupts using this single register. | |
91 | .Pp | |
92 | In the synopsis the | |
93 | .Nm flags 0x401 | |
94 | means that the 4th port (sio4) is the master | |
95 | device (so the MSB of the flags), and that the ports are part of a | |
96 | multiport card (the LSB of the flags, actually only the LS | |
97 | .Nm bit | |
98 | ). | |
99 | F.e. if you have only two standard ports in addition to multiport | |
100 | card, this | |
101 | .Nm flags | |
102 | will be | |
103 | .Nm 0x201 . | |
104 | .Pp | |
105 | Which port is the master device depends on the card type. Consult | |
106 | the hardware documentation of your card. | |
107 | If you are shure, that your master device fully compatible with | |
108 | standard port, you can ommit | |
109 | .Nm flags | |
110 | field from master device description line. | |
111 | .Pp | |
112 | Serial ports controlled by the | |
113 | .Nm sio | |
114 | driver can be used for both dialin and dialout. Use | |
115 | .Xr comcontrol 8 | |
116 | to enable/disable bidirectional use of the | |
117 | .Nm sio | |
118 | ports. The minor number of the dialout | |
119 | port is 128 higher than that of the corresponding dialin port. Use | |
120 | .Xr stty 1 | |
121 | to enable or disable modem control as required by your setup. | |
52ac9c69 RG |
122 | .Sh FILES |
123 | .Bl -tag -width Pa | |
63ec8d43 AC |
124 | .It Pa /dev/tty0? for dialin |
125 | .It Pa /dev/cua0? for dialout | |
52ac9c69 RG |
126 | .El |
127 | .Sh DIAGNOSTICS | |
128 | .Bl -diag | |
129 | .It sio%d: silo overflow. | |
130 | The single-character input | |
131 | .Dq silo | |
132 | has overflowed and incoming data has been lost. | |
133 | .\".It com%d: weird interrupt: %x. | |
134 | .\"The device has generated an unexpected interrupt | |
135 | .\"with the code listed. | |
136 | .El | |
137 | .Sh SEE ALSO | |
63ec8d43 AC |
138 | .Xr tty 4 , |
139 | .Xr comcontrol 8 , | |
140 | .Xr stty 1 . | |
52ac9c69 RG |
141 | .Sh HISTORY |
142 | The | |
143 | .Nm | |
144 | driver is derived from the | |
145 | .Nm HP9000/300 | |
146 | .Nm dca | |
147 | driver and is | |
148 | .Ud | |
149 | .Sh BUGS | |
63ec8d43 AC |
150 | Data loss is not near as likely on busy systems |
151 | but they still can occur at very high baud rates on slow systems. The | |
152 | use of NS16550A's helps lot to handle high baud rates. | |
52ac9c69 RG |
153 | .Pp |
154 | The constants which define the locations | |
63ec8d43 | 155 | of the various serial ports are holdovers from |
52ac9c69 | 156 | .Nm DOS . |
63ec8d43 AC |
157 | As shown, hex addresses can be used instead. |
158 | .Pp | |
159 | As usual, you get what you pay for; cheap NS16550 clones generally don't work. | |
160 | .Pp | |
161 | The multiport example has been successfully tested with an AST/4 card, your | |
162 | mileage may vary however. | |
52ac9c69 | 163 | .Pp |
63ec8d43 | 164 | This man page can not replace the Ultimate Doc(tm): the source. |