1993-10-06 12:45:31 +03:00
|
|
|
.\"
|
|
|
|
|
.\" 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.
|
|
|
|
|
.\"
|
1995-02-17 12:43:38 +03:00
|
|
|
.\" $Id: cy.4,v 1.2 1995/02/17 09:43:40 jtc Exp $
|
1993-10-06 12:45:31 +03:00
|
|
|
.\"
|
|
|
|
|
.Dd 5 October, 1993
|
|
|
|
|
.Dt CY 4 i386
|
|
|
|
|
.Sh NAME
|
|
|
|
|
.Nm cy
|
|
|
|
|
.Nd
|
|
|
|
|
Cyclades Cyclom-{4, 8, 16}Y asynchronous comms board device driver
|
|
|
|
|
.Sh SYNOPSIS
|
1995-02-17 12:43:38 +03:00
|
|
|
.Cd "cy0 at isa? tty irq 10 iomem 0xdc000 iosiz 8192 vector cyintr"
|
1993-10-06 12:45:31 +03:00
|
|
|
.Sh DESCRIPTION
|
|
|
|
|
This driver provides an interface to Cyclades Cyclom-4Y, Cyclom-8Y and
|
|
|
|
|
Cyclom-16Y 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
|
|
|
|
|
c c x x u u u u - bits in the minor device number
|
|
|
|
|
|
|
|
|
|
bits meaning
|
|
|
|
|
---- -------
|
|
|
|
|
uuuu physical serial line (i.e. unit) to use
|
|
|
|
|
0-7 on a cyclom-8Y, 0-15 on a cyclom-16Y
|
|
|
|
|
|
|
|
|
|
xx unused
|
|
|
|
|
|
|
|
|
|
cc carrier control mode
|
|
|
|
|
00 complete hardware carrier control of the tty.
|
|
|
|
|
DCD must be high for the open(2) to complete.
|
|
|
|
|
01 reserved
|
|
|
|
|
10 carrier ignored until a high->low transition
|
|
|
|
|
11 carrier completed ignored
|
|
|
|
|
.Ed
|
|
|
|
|
.Sh DIAGNOSTICS
|
|
|
|
|
.Bl -diag
|
|
|
|
|
.It "cy%d: tty input queue overflow"
|
|
|
|
|
Incoming characters have been discarded due to a buffer overflow. This is
|
|
|
|
|
caused by the process in control of the device not read(2)ing characters
|
|
|
|
|
fast enough.
|
|
|
|
|
.It "cy%d: receive fifo overrun"
|
|
|
|
|
Incoming characters have been discarded due to a CD1400 channel overrun. This
|
|
|
|
|
is caused by interrupts not being serviced sufficiently quickly to prevent
|
|
|
|
|
the 12 byte receive FIFO on a serial channel from overflowing. Reducing
|
|
|
|
|
the value of the \fIRxFifoThreshold\fR #define from 8 to something smaller may
|
|
|
|
|
help slow machines avoid this problem. The driver must have been compiled
|
|
|
|
|
with the \fILogOverruns\fR option defined (the default) in order for this
|
|
|
|
|
condition to be logged.
|
|
|
|
|
.Sh SEE ALSO
|
|
|
|
|
.Xr com 4 ,
|
|
|
|
|
.Xr termios 4 ,
|
|
|
|
|
.Xr tty 4
|
|
|
|
|
.Sh AUTHORS
|
|
|
|
|
The driver was written by Andrew Herbert <andrew@werple.apana.org.au>, and
|
|
|
|
|
is still under development (from time to time :-).
|
|
|
|
|
.Sh HISTORY
|
|
|
|
|
Some ideas for the architecture of this driver's two-layer processing model
|
|
|
|
|
were derived from the fas 2.10 driver by Uwe Doering
|
|
|
|
|
<gemini@geminix.in-berlin.de> and the high-performance com driver by Bruce
|
|
|
|
|
Evans <bde@kralizec.zeta.org.au>.
|
|
|
|
|
.Pp
|
|
|
|
|
This work was made possible through the donation of a Cyclom-8Y board by the
|
|
|
|
|
manufacturer, Cyclades Corporation. However, neither Cyclades nor the author
|
|
|
|
|
make any warranties regarding this software, nor guarantees of support.
|
|
|
|
|
.Sh BUGS
|
|
|
|
|
There is currently no BREAK handling - breaks are ignored.
|
|
|
|
|
There is no support for bad-character reporting, except via PARMRK.
|
|
|
|
|
The Cyclom-[48]Y boards do not listen to the RTS signal for receiver flow
|
|
|
|
|
control.
|
|
|
|
|
FIFO overruns are only logged when the termios IGNPAR setting is enabled.
|
