129 lines
4.4 KiB
Groff
129 lines
4.4 KiB
Groff
.\" $NetBSD: cz.4,v 1.5 2001/09/12 18:19:17 wiz Exp $
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.\"
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.\" Copyright (c) 2000 Zembu Labs, Inc.
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.\" All rights reserved.
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.\"
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.\" Author: Jason R. Thorpe <thorpej@zembu.com>
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Zembu Labs, Inc.
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.\" 4. Neither the name of Zembu Labs nor the names of its employees may
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.\" be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY ZEMBU LABS, INC. ``AS IS'' AND ANY EXPRESS
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.\" OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WAR-
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.\" RANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DIS-
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.\" CLAIMED. IN NO EVENT SHALL ZEMBU LABS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd May 17, 2000
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.Dt CZ 4
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.Os
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.Sh NAME
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.Nm cz
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.Nd Cyclades-Z series multi-port serial adapter device driver
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.Sh SYNOPSIS
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.Cd "cz* at pci? dev ? function ?"
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.Sh DESCRIPTION
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The
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.Nm
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device driver supports the Cyclades-Z series of multi-port serial adapters.
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The Cyclades-Z is an intelligent serial controller comprising:
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.Bl -bullet -offset indent
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.It
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PLX9060ES PCI bus interface
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.It
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Xilinx XC5204 FPGA
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.It
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IDT R3052 MIPS CPU
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.El
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.Pp
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The MIPS CPU runs firmware provided by the device driver. Communication
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with the MIPS is performed by modifying data structures located in board
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local RAM or host RAM.
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.Pp
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The Cyclades-Z comes in three basic flavors:
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.Bl -bullet -offset indent
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.It
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Cyclades-8Zo rev. 1 -- This is an older 8-port board with no FPGA. The
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serial ports are provided by an octopus cable.
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.It
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Cyclades-8Zo rev. 2 -- This is the newer 8-port board. The serial ports
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are provided by an octopus cable.
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.It
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Cyclades-Ze -- This is the expandable version of the Cyclades-Z. It uses
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an HD-50 SCSI cable to connect the board to a 1U rack mountable serial
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expansion box. Each box has 16 RJ45 serial ports, and up to 4 boxes may
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be chained together, for a total of 64 ports. Boxes 3 and 4 require their
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own external power supply, otherwise the firmware will refuse to start
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(as it cannot communicate with the UARTs in those boxes).
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.El
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.Pp
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The Cyclades-Z has several features to improve performance under
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high serial I/O load:
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.Bl -bullet -offset indent
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.It
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The board may operate in interrupt-driven mode or polled mode to reduce
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interrupt load.
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.It
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Each channel has a large input and output buffer.
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.It
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Each channel may be programmed to generate an interrupt based on
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reception of a specific character, e.g. a PPP End-Of-Frame character.
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.It
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The MIPS CPU on the board performs all flow-control handling.
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.El
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.Sh FILES
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.Bl -tag -width Pa -compact
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.It Pa /dev/ttyCZnnnn -- dial-in (normal) TTY device
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.It Pa /dev/dtyCZnnnn -- dial-out TTY device
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.El
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.\" .Sh DIAGNOSTICS
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.\" XXX too be done.
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.Sh SEE ALSO
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.Xr pci 4 ,
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.Xr termios 4 ,
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.Xr tty 4
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Nx 1.5 .
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.Sh AUTHORS
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The
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.Nm
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driver was written by
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.An Jason R. Thorpe Aq thorpej@zembu.com
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and
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.An Bill Studenmund Aq wrstuden@zembu.com
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of Zembu Labs, Inc.
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.Sh BUGS
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The
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.Nm
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driver does not currently implement communication via host RAM. While
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this may improve performance by reducing the number of PCI memory
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space read/write cycles, it is not straightforward to implement with
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the current
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.Xr bus_dma 9
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API.
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.Pp
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Interrupt mode has not been tested.
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.Pp
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There is no support for reading or writing the EEPROM connected to
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the PLX PCI bus controller.
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