.\"     $NetBSD: spif.4,v 1.7 2014/03/18 18:20:39 riastradh Exp $
.\"     $OpenBSD: spif.4,v 1.12 2003/11/09 16:06:07 jmc Exp $
.\"
.\" Copyright (c) 1999 Jason L. Wright (jason@thought.net)
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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.\" ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\"
.Dd February 4, 1999
.Dt SPIF 4
.Os
.Sh NAME
.Nm spif
.Nd SBus (spiffy) Serial/Parallel Interface
.Sh SYNOPSIS
.Cd "spif* at sbus? slot ? offset ?                " Pq "sun4c/sun4m/sun4u"
.Cd "stty* at spif?                                " Pq "sun4c/sun4m/sun4u"
.Cd "sbpp* at spif?                                " Pq "sun4c/sun4m/sun4u"
.Sh DESCRIPTION
The
.Nm spif
driver provides support for the Sun Serial/Parallel Interface card
(Sun part number 501-1931), which is based on 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/ttyS[0123][0-7] -compact
.It /dev/ttyS[0123][0-7]
Serial ports
.It /dev/bppS[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
adapter was first supported in
.Ox 2.5 .
The driver was ported to
.Nx 3.0 .
.Sh AUTHORS
.An -nosplit
The driver was written by
.An Jason Wright Aq Mt jason@thought.net ,
and is heavily based on the
.Xr magma 4
driver written by
.An Iain Hibbert .
.Sh TODO
The parallel port is not supported yet.
.Pp
Dial-out (cua) devices are not yet supported.