89 lines
2.8 KiB
Groff
89 lines
2.8 KiB
Groff
.\"
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.\" Copyright (c) 2008 Alexander Motin <mav@FreeBSD.org>
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.\" All rights reserved.
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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. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd August 25, 2020
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.Dt SDHCI 4
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.Os
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.Sh NAME
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.Nm sdhci
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.Nd PCI SD Host Controller bridge driver
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.Sh SYNOPSIS
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To compile this driver into the kernel, place the following lines in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device mmc"
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.Cd "device mmcsd"
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.Cd "device sdhci"
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.Ed
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.Pp
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Alternatively, to load the driver as a module at boot time, place the
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following lines in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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mmc_load="YES"
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mmcsd_load="YES"
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sdhci_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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driver supports PCI devices with class 8 and subclass 5 according to
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SD Host Controller Specification.
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Driver supports up to six high speed 4bit MMC/SD slots per controller.
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Driver attaches mmc bus to the respective slot on card insertion and
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detaches it on card removing.
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.Sh HARDWARE
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The
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.Nm
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driver supports different specification compatible chips.
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The following chips have been verified to work:
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.Pp
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.Bl -bullet -compact
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.It
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ENE CB712
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.It
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ENE CB714
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.It
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RICOH R5C822
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.It
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RICOH R5CE823
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.It
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TI PCIXX21/XX11/XX12
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.El
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.Sh SEE ALSO
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.Xr mmc 4 ,
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.Xr mmcsd 4
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.Rs
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.%T "SD Specifications, Part 2, SD Host Controller, Simplified Specification"
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.Re
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.Sh AUTHORS
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.An Alexander Motin Aq Mt mav@FreeBSD.org
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.Sh BUGS
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Many of existing SD controller chips have some nonstandard requirements,
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proprietary registers and hardware bugs, requiring additional handling.
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ENE chips are handled to work fine, while some revisions of RICOH and TI
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controllers still do not see cards without some additional initialization.
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