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.\"
.\" Copyright (c) 2000 Michael Smith
.\" Copyright (c) 2000 BSDi
.\" 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. 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.
.\"
.\" $FreeBSD$
.\"
.Dd April 10, 2000
.Dt TWE 4
.Os
.Sh NAME
.Nm twe
.Nd 3ware Escalade ATA RAID adapter driver
.Sh SYNOPSIS
.Cd device pci
.Cd device twe
.Sh DESCRIPTION
The
.Nm
driver provides support for the Escalade 3W-5x00 and 3W-6x00 series
of ATA RAID controllers.
These devices support 2, 4 or 8 ATA disk drives
and provide RAID0 (striping) and RAID1 (mirroring) functionality.
.Sh DIAGNOSTICS
.Ss Controller initialisation phase
.Bl -diag
.It twe%d: microcontroller not ready
.Pp
The controller's onboard CPU is not reporting that it is ready;
this may be due to either a board or system failure.
Initialisation has failed.
.It twe%d: no attention interrupt
.It twe%d: can't drain AEN queue
.It twe%d: reset not reported
.It twe%d: controller errors detected
.It twe%d: can't drain response queue
.It twe%d: reset %d failed, trying again
.Pp
The controller is not responding correctly to
the driver's attempts to reset and initialise it.
This process is retried several times.
.It twe%d: can't initialise controller, giving up
.Pp
Several attempts to reset and initialise the controller have failed;
initialisation has failed
and the driver will not attach to this controller.
.Ss Driver initialisation/shutdown phase
.Bl -diag
.It twe%d: register window not available
.It twe%d: can't allocate register window
.It twe%d: can't allocate parent DMA tag
.It twe%d: can't allocate interrupt
.It twe%d: can't set up interrupt
.It twe%d: can't establish configuration hook
.Pp
A resource allocation error occurred while initialising the driver;
initialisation has failed
and the driver will not attach to this controller.
.It twe%d: can't detect attached units
.Pp
Fetching the list of attached units failed; initialisation has failed.
.It twe%d: error fetching capacity for unit %d
.It twe%d: device_add_child failed
.It twe%d: bus_generic_attach returned %d
.Pp
Creation of the disk devices failed;
attachment of one or more units may have been aborted.
.It twe%d: command failed - 0x%x
.It twe%d: command failed - controller wedged
.Pp
A command was reported as failed by the controller,
or could not be delivered to the controller.
.It twe%d: host interrupt
.Pp
The controller has signalled a host interrupt.
This serves an unknown purpose and is ignored.
.It twe%d: command interrupt
.Pp
The controller has signalled a command interrupt.
This is not used, and will be disabled.
.It twe%d: error polling for signalled AENs
.Pp
The controller has reported
that one or more status messages are ready for the driver,
but attempting to fetch one of these has returned an error.
.It twe%d: AEN queue overflow, lost AEN <%s>
.Pp
A status message was retrieved from the controller,
but there is no more room to queue it in the driver.
The message is lost.
.It twe%d: missing expected status bits %s
.It twe%d: unexpected status bits %s
.Pp
A check of the controller's status bits
indicates an unexpected condition.
.Sh BUGS
Much of the controller's status cannot currently be interpreted,
due to lack of information from 3ware.
.Pp
The controller cannot handle I/O transfers
that are not aligned to a 512-byte boundary.
In order to support raw device access from user-space,
the driver will perform alignment fixup on non-aligned data.
This process is inefficient,
and thus in order to obtain best performance
user-space applications accessing the device
should do so with aligned buffers.
.Sh AUTHORS
The
.Nm
driver and manpage were written by
.An Michael Smith
.Aq msmith@FreeBSD.org .
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