.\" $OpenBSD: ahd.4,v 1.14 2007/05/31 19:19:49 jmc Exp $
.\"
.\" Copyright (c) 1995, 1996, 1997, 1998, 2000
.\" 	Justin T. Gibbs.  All rights reserved.
.\" Copyright (c) 2002
.\"	Scott Long.  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 of the author 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.
.\"
.\" $FreeBSD: /repoman/r/ncvs/src/share/man/man4/ahd.4,v 1.5 2004/07/04 14:17:41 simon Exp $
.\"
.Dd $Mdocdate: May 31 2007 $
.Dt AHD 4
.Os
.Sh NAME
.Nm ahd
.Nd Adaptec PCI/PCI-X AIC79xx-based Ultra320 SCSI interface
.Sh SYNOPSIS
.Cd "ahd* at pci?"
.Cd "scsibus* at ahd?"
.Sh DESCRIPTION
.Nm
provides access to the
.Tn SCSI
bus(es) connected to Adaptec
.Tn AIC79xx
host adapter chips.
.Pp
.Nm
supports narrow and wide buses; synchronous and
asynchronous operation; fast, ultra, ultra2, ultra160, and ultra320
(packetized) transfers; tagged queuing and 512 SCBs.
.Pp
.Nm
does not support target mode operation.
.Pp
The
.Nm
driver supports the following:
.Pp
.Bl -bullet -compact -offset indent
.It
Adaptec
.Tn AIC7901
host adapter chip
.It
Adaptec
.Tn AIC7901A
host adapter chip
.It
Adaptec
.Tn AIC7902
host adapter chip
.It
Adaptec
.Tn 29320
host adapter
.It
Adaptec
.Tn 39320
host adapter
.It
Many motherboards with on-board
.Tn SCSI
support
.El
.Pp
To compile in debugging code:
.Bd -ragged -offset indent
.Cd option AHD_DEBUG
.Cd option AHD_DEBUG_OPTS=<bitmask of options>
.Ed
.Pp
The
.Dv AHD_DEBUG_OPTS
option is used to control which diagnostic messages are printed to the
console when
.Dv AHD_DEBUG
is enabled.
Logically OR the following bits together:
.Bl -column -offset indent Value Function
.Em "Value	Function"
0x0001	Show miscellaneous information
0x0002	Show sense data
0x0004	Show Serial EEPROM contents
0x0008	Show bus termination settings
0x0010	Show host memory usage
0x0020	Show SCSI protocol messages
0x0040	Show mode pointer of the chip register window
0x0080	Show selection timeouts
0x0100	Show FIFO usage messages
0x0200	Show Queue Full status
0x0400	Show SCB queue status
0x0800	Show inbound packet information
0x1000	Show S/G list information
0x2000	Enable extra diagnostic code in the firmware
.El
.Pp
Per target configuration performed in the
.Tn SCSI-Select
menu, accessible at boot,
is honored by this driver.
This includes synchronous/asynchronous transfers,
maximum synchronous negotiation rate,
wide transfers,
disconnection,
and the host adapters
.Tn SCSI
ID.
.Sh SEE ALSO
.Xr ahc 4 ,
.Xr cd 4 ,
.Xr ch 4 ,
.Xr intro 4 ,
.Xr pci 4 ,
.Xr scsi 4 ,
.Xr sd 4 ,
.Xr st 4 ,
.Xr uk 4
.Sh HISTORY
The
.Nm
driver was ported from
.Fx 4.7
and first appeared in
.Ox 3.6 .
.Sh AUTHORS
The
.Nm
driver, the
.Tn AIC7xxx
sequencer-code assembler,
and the firmware running on the aic79xx chips was written by
.An Justin T. Gibbs .
.Pp
.Ox
port by Milos Urbanek, Kenneth R. Westerback & Marco Peereboom.