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+.\"	$NetBSD: cy.4,v 1.8 2001/09/12 18:19:17 wiz Exp $
+.\"
+.\" Copyright (c) 1997 Jason R. Thorpe.  All rights reserved.
+.\" Copyright (c) 1993 Andrew Herbert.
+.\" 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
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. The name Andrew Herbert may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (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, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd November 10, 1997
+.Dt CY 4
+.Os
+.Sh NAME
+.Nm cy
+.Nd
+Cyclades Cyclom-{4, 8, 16, 32}Y asynchronous comms board serial device driver
+.Sh SYNOPSIS
+.Cd "cy0 at isa? iomem 0xd4000 irq 12"
+.Cd "cy* at pci? dev ? function ?"
+.Sh DESCRIPTION
+This driver provides an interface to Cyclades Cyclom-4Y, Cyclom-8Y,
+Cyclom-16Y, and Cyclom-32Y asynchronous multiport serial boards.  These
+boards are based around Cirrus Logic CD1400 communication controllers.
+.Pp
+The device minor numbers for this driver are encoded as follows:
+.Pp
+.Bd -literal
+    d c c p p p p p	- bits in the minor device number
+
+    bits    meaning
+    ----    -------
+    ppppp   physical serial line (i.e. port) to use:
+		0-3 on Cyclom-4Y
+		0-7 on Cyclom-8Y
+		0-15 on Cyclom-16Y
+		0-31 on Cyclom-32Y
+
+    cc      card unit number; note this limits the driver to
+	    four cards per system
+
+    d       set to use as a dial-out line
+.Ed
+.Sh FLOW CONTROL
+The
+.Nm
+driver makes use of the CD1400's automatic CTS flow control.  In addition,
+the CD1400's automatic input flow control can be used.  This requires the
+kernel configuration option
+.Em CY_HW_RTS
+and a special cable that exchanges the RTS and DTR lines.
+.Sh DIAGNOSTICS
+.Bl -diag
+.It "cy%d: port %d: can't allocate tty"
+There is not enough memory to allocate tty data structures.
+.It "cy%d: can't allocate input buffer"
+There is not enough memory to allocate the data input buffer.
+.El
+.Pp
+Additional debugging output can be enable with the kernel configuration
+option
+.Em CY_DEBUG .
+Diagnostic counters may be enabled with the kernel configuration option
+.Em CY_DEBUG1 .
+.Sh SEE ALSO
+.Xr termios 4 ,
+.Xr tty 4
+.Sh AUTHORS
+The
+.Nm
+driver was written by Timmo Rossi.
+.Sh BUGS
+Support for the Cyclom-32Y has not been tested.