.\"
.\" Copyright (c) 2020 Henri Hennebert <hlh@restart.be>
.\" 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 February 10, 2022
.Dt RTSX 4
.Os
.Sh NAME
.Nm rtsx
.Nd Realtek SD card reader
.Sh SYNOPSIS
To compile this driver into the kernel, place the following
lines in the kernel configuration file:
.Bd -ragged -offset indent
.Cd "device mmc"
.Cd "device mmcsd"
.Cd "device rtsx"
.Ed
.Pp
Alternatively, to load the driver as a module at boot time,
place the following lines in
.Xr loader.conf 5 :
.Bd -literal -offset indent
mmc_load="YES"
mmcsd_load="YES"
rtsx_load="YES"
.Ed
.Sh DESCRIPTION
The
.Nm
driver provides support for Realtek SD card reader.
Driver attaches mmc bus on card insertion and detaches it on card removing.
.Sh HARDWARE
The
.Nm
driver supports different specification compatible chips.
The following chips have been verified to work:
.Pp
.Bl -bullet -compact
.It
RTS5209
.It
RTS5227
.It
RTS5229
.It
RTS522A
.It
RTS525A
.It
RTS5260
.It
RTL8411B
.El
.Pp
It should also work for:
.Pp
.Bl -bullet -compact
.It
RTS5249
.It
RTL8402
.It
RTL8411
.El
.Sh SEE ALSO
.Xr mmc 4 ,
.Xr mmcsd 4
.Rs
.%T "SD Specifications, Part 2, SD Host Controller, Simplified Specification"
.%T "SanDisk Secure Digital Card"
.Re
.Sh HISTORY
The
.Nm
driver was ported from
.Ox
with modifications found in Linux and
.Nx .
.Sh AUTHORS
.An Henri Hennebert Aq Mt hlh@restart.be
.An Gary Jennejohn Aq Mt gj@freebsd.org
.An Jesper Schmitz Mouridsen Aq Mt jsm@FreeBSD.org
.Sh CONTRIBUTORS
.An Lutz Bichler Aq Mt Lutz.Bichler@gmail.com
.Sh DEBUGGING INFORMATION
.Em dev.rtsx.0.debug_mask
can be set with the following masks:
.Bl -bullet
.It
0x01 - to show the basic flow of the driver,
.It
0x02 - to trace the SD commands,
.It
0x04 - to trace the tuning phase.
.El
.Sh BUGS
.Bl -bullet
.It
RTS522A on Lenovo T470p, card detection and read-only switch are reversed.
This is solved by adding in
.Em loader.conf(5) :
.Bd -ragged
.Cd dev.rtsx.0.inversion=1
.Ed
.Pp
The driver tries to automate those exceptions.
If this automation is wrong, it can be avoided by adding in
.Em loader.conf(5) :
.Bd -ragged
.Cd dev.rtsx.0.inversion=0
.Ed
.It
Mounting a filesystem with write access on a card write protected may involve a kernel crash.
.It
Suspend/Resume do not work under MMCCAM.
.El