.\" Copyright (c) 2009 Alexander Motin <mav@FreeBSD.org>
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.\"
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.\" $FreeBSD: src/share/man/man4/siis.4,v 1.1.2.3.4.1 2010/12/21 17:09:25 kensmith Exp $
.\"
.Dd July 18, 2009
.Dt SIIS 4
.Os
.Sh NAME
.Nm siis
.Nd SiliconImage Serial ATA Host Controller driver
.Sh SYNOPSIS
To compile this driver into the kernel,
place the following lines in your
kernel configuration file:
.Bd -ragged -offset indent
.Cd "device pci"
.Cd "device scbus"
.Cd "device siis"
.Ed
.Pp
Alternatively, to load the driver as a
module at boot time, place the following line in
.Xr loader.conf 5 :
.Bd -literal -offset indent
siis_load="YES"
.Ed
.Pp
The following tunables are settable from the
.Xr loader 8 :
.Bl -ohang
.It Va hint.siis. Ns Ar X Ns Va .msi
controls Message Signaled Interrupts (MSI) usage by the specified controller.
.It Va hint.siisch. Ns Ar X Ns Va .pm_level
controls SATA interface Power Management for the specified channel,
allowing some power to be saved at the cost of additional command
latency.
Possible values:
.Bl -tag -compact
.It 0
interface Power Management is disabled (default);
.It 1
device is allowed to initiate PM state change, host is passive.
.El
Note that interface Power Management is not compatible with
device presence detection.
A manual bus reset is needed on device hot-plug.
.It Va hint.siisch. Ns Ar X Ns Va .sata_rev
setting to nonzero value limits maximum SATA revision (speed).
Values 1, 2 and 3 are respectively 1.5, 3 and 6Gbps.
.El
.Sh DESCRIPTION
This driver provides the
.Xr CAM 4
subsystem with native access to the
.Tn SATA
ports of controller.
Each SATA port is represented to CAM as a separate bus with 16 targets.
Most of the bus-management details are handled by the SATA-specific
transport of CAM.
Connected ATA disks are handled by the ATA protocol disk peripheral driver
.Xr ada 4 .
ATAPI devices are handled by the SCSI protocol peripheral drivers
.Xr cd 4 ,
.Xr da 4 ,
.Xr sa 4 ,
etc.
.Pp
Driver features include support for Serial ATA and ATAPI devices,
Port Multipliers (including FIS-based switching), hardware command queues
(31 command per port), Native Command Queuing, SATA interface Power Management,
device hot-plug and Message Signaled Interrupts.
.Pp
Same hardware is also supported by the atasiliconimage driver from
.Xr ata 4
subsystem.
If both drivers are loaded at the same time, this one will be
given precedence as the more functional of the two.
.Sh HARDWARE
The
.Nm
driver supports the following controllers:
.Bl -bullet -compact
.It
SiI3124
.It
SiI3132
.It
SiI3531
.El
.Sh SEE ALSO
.Xr ada 4 ,
.Xr ata 4 ,
.Xr cam 4 ,
.Xr cd 4 ,
.Xr da 4 ,
.Xr sa 4
.Sh HISTORY
The
.Nm
driver first appeared in
.Fx 8.0 .
.Sh AUTHORS
.An Alexander Motin Aq mav@FreeBSD.org .