.\"     $OpenBSD: spif.4,v 1.13 2004/09/30 19:59:27 mickey Exp $
.\"
.\" Copyright (c) 1999 Jason L. Wright (jason@thought.net)
.\" All rights reserved.
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.Dd February 4, 1999
.Dt SPIF 4 sparc
.Os
.Sh NAME
.Nm spif
.Nd SBus (spiffy) Serial/Parallel Interface
.Sh SYNOPSIS
.Cd "spif* at sbus?   " Pq "sun4c/sun4m"
.Cd "stty* at spif?   " Pq "sun4c/sun4m"
.Cd "sbpp* at spif?   " Pq "sun4c/sun4m"
.Sh DESCRIPTION
The
.Nm spif
driver provides support for the Sun Serial/Parallel Interface card
(Sun part number 501-1931)
based around the
Cirrus Logic CD180 octal serial controller
and the
Cirrus Logic PPC2 parallel port controller.
.Pp
The device minor numbers for this driver are encoded as follows:
.Bd -literal
    +---+---+---+---+---+---+---+---+
    | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
    +---+---+---+---+---+---+---+---+
      |   |   |   |   |   |   |   |
      |   |   |   |   |   +---+---+---> port number
      |   |   |   |   |
      |   |   |   |   +---------------> unused
      |   |   |   |
      |   |   |   +-------------------> dial-out (on tty ports)
      |   |   |
      |   |   +-----------------------> unused
      |   |
      +---+---------------------------> card number
.Ed
.Pp
Up to four cards are supported in the system.
.Pp
Each of the serial ports has an 8 byte FIFO for receive and transmit as
well as automatic hardware (RTS/CTS) flow control.
.Sh FILES
.Bl -tag -width /dev/tty[jkl][0-7] -compact
.It /dev/tty[jkl][0-7]
Serial ports
.It /dev/sbpp[0-3]
Parallel ports
.El
.Sh DIAGNOSTICS
.Bl -diag
.It "spif%d: ccr timeout"
A timeout occurred while writing to one of the CD180 registers.
.It "stty%d-%d: ring overflow"
Incoming characters were discarded because the application
in control of the device did not read the input fast enough.
.El
.Sh SEE ALSO
.Xr intro 4 ,
.Xr sbus 4 ,
.Xr tty 4
.Sh HISTORY
The
.Nm spif
driver was first supported in
.Ox 2.5 .
.Sh AUTHORS
The driver was written by
.An Jason Wright Aq jason@thought.net ,
and is heavily based on the
.Xr magma 4
driver written by
.An Iain Hibbert Aq plunky@skate.demon.co.uk .
.Sh TODO
The parallel port is not supported yet.
.Pp
Dial-out (cua) devices are not yet supported.