1.\" 2.\" Copyright (c) 2008 Alexander Motin <mav@FreeBSD.org> 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. The name of the author may not be used to endorse or promote products 11.\" derived from this software without specific prior written permission. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD: src/share/man/man4/sdhci.4,v 1.2 2009/01/16 19:28:25 mav Exp $ 26.\" 27.Dd May 13, 2017 28.Dt SDHCI 4 29.Os 30.Sh NAME 31.Nm sdhci 32.Nd PCI SD Host Controller bridge driver 33.Sh SYNOPSIS 34To compile this driver into the kernel, place the following lines in your 35kernel configuration file: 36.Bd -ragged -offset indent 37.Cd "device mmc" 38.Cd "device mmcsd" 39.Cd "device sdhci" 40.Ed 41.Pp 42Alternatively, to load the driver as a module at boot time, place the 43following lines in 44.Xr loader.conf 5 : 45.Bd -literal -offset indent 46mmc_load="YES" 47mmcsd_load="YES" 48sdhci_pci_load="YES" 49.Ed 50.Sh DESCRIPTION 51The 52.Nm 53driver supports PCI devices with class 8 and subclass 5 according to 54SD Host Controller Specification. 55Driver supports up to six high speed 4bit MMC/SD slots per controller. 56Driver attaches mmc bus to the respective slot on card insertion and 57detaches it on card removing. 58.Sh HARDWARE 59The 60.Nm 61driver supports different specification compatible chips. The following 62chips have been verified to work: 63.Pp 64.Bl -bullet -compact 65.It 66ENE CB712 67.It 68ENE CB714 69.It 70RICOH R5C822 71.It 72RICOH R5CE823 73.It 74TI PCIXX21/XX11 75.El 76.Sh LOADER TUNABLES 77.Bl -tag -width indent 78.It Va hw.sdhci.debug 79Set verbose debugging level. 80Levels 0 to 3 are currently used. 81.It Va hw.sdhci.adma2_test 82Set to 1 to allow using ADMA2 transfer mode on untested controller models. 83.It Va hw.sdhci.sdma_disable 84Set to 1 to disable the SDMA transfer mode. 85.It Va hw.sdhci.adma2_disable 86Set to 1 to disable the ADMA2 transfer mode. 87.El 88.Sh SEE ALSO 89.Xr mmc 4 , 90.Xr mmcsd 4 91.Rs 92.%T "SD Specifications, Part 2, SD Host Controller, Simplified Specification" 93.Re 94.Sh HISTORY 95The 96.Nm 97driver was imported from 98.Fx 99into 100.Dx 2.7 101and updated by 102.An Markus Pfeiffer Aq Mt profmakx@dragonflybsd.org . 103.Sh AUTHORS 104.An Alexander Motin Aq Mt mav@FreeBSD.org 105.Sh BUGS 106Many of existing SD controller chips have some nonstandard requirements, 107proprietary registers and hardware bugs, requiring additional handling. 108ENE chips are handled to work fine, while some revisions of RICOH and TI 109controllers still do not see cards without some additional initialization. 110