[PATCH 1/7] mmc: mxs-mmc: add mmc host driver for i.MX23/28

[Lothar Waßmann]

Hi,

Shawn Guo writes:
> Hi Lothar,
> 
> On Wed, Feb 09, 2011 at 08:46:18AM +0100, Lothar Waßmann wrote:
> > Hi Shawn,
> > 
> > Shawn Guo writes:
> > > This adds the mmc host driver for Freescale MXS-based SoC i.MX23/28.
> > > The driver calls into mxs-dma via generic dmaengine api for both pio
> > > and data transfer.
> > > 
> > > Signed-off-by: Shawn Guo <shawn.guo at freescale.com>
> > > ---
> > >  arch/arm/mach-mxs/include/mach/mmc.h |   15 +
> > >  drivers/mmc/host/Kconfig             |    9 +
> > >  drivers/mmc/host/Makefile            |    1 +
> > >  drivers/mmc/host/mxs-mmc.c           |  884 ++++++++++++++++++++++++++++++++++
> > >  4 files changed, 909 insertions(+), 0 deletions(-)
> > >  create mode 100644 arch/arm/mach-mxs/include/mach/mmc.h
> > >  create mode 100644 drivers/mmc/host/mxs-mmc.c
> > > 
> > I've run the mmc-test kernel module with this driver on our TX28
> > module which fails in the following tests:
> > |mmc0: Test case 15. Correct xfer_size at write (start failure)...
> > |mmc0: Result: ERROR (-110)
> > |mmc0: Test case 16. Correct xfer_size at read (start failure)...
> > |mmc0: Result: ERROR (-110)
> > |mmc0: Test case 17. Correct xfer_size at write (midway failure)...
> > |mmc0: Result: ERROR (-110)
> > |mmc0: Test case 18. Correct xfer_size at read (midway failure)...
> > |mmc0: Result: ERROR (-110)
> > 
> > Could you try the test on your hardware?
> > 
> I'm new to this test.  I enabled MMC_TEST but did not see "test"
> under /sys for mmc.  Can you please elaborate how to launch this
> test?  Thanks.
> 
You need debugfs mounted and the mmc-test module loaded.
An inserted card will normally be grabbed by the mmc-block driver. You
can 'unbind' the driver and 'bind' it to the mmc-test driver using the
corresponding entries in sysfs. The mmc-test driver can be controlled
via debugfs.

The following script steals an inserted card from the mmc-block driver
and performs all mmc-test testcases (TRASHING THE CONTENTS OF THE
CARD!).
<--------
#!/bin/bash
drv_path=/sys/bus/mmc/drivers
dbg_path=/sys/kernel/debug
testdrv=mmc_test

shopt -s nullglob
card=""

cleanup() {
    if [ -n "$card" -a -n "$driver" -a "$driver" != "$testdrv" ];then
	echo "Restoring driver $driver"
	echo "$card" > "$drv_path/$testdrv/unbind"
	echo "$card" > "$drv_path/$driver/bind"
    fi
}

trap cleanup 0
set -e
cd "$drv_path"
for d in *;do
    for l in "$d/"*;do
	[ -h "$l" ] || continue
	card="$(basename "$l")"
	driver="$(dirname "$l")"
	break
    done
    [ -n "$card" ] && break
done
if [ -z "$card" ];then
    echo "No MMC/SD card found"
    exit 1
fi
if [ "$driver" != "$testdrv" ];then
    echo "Trying to claim card $card from driver $driver"
    echo "$card" > "$drv_path/$driver/unbind"
    echo "$card" > "$drv_path/$testdrv/bind"
fi
echo "WARNING: Card $card will be overwritten!"
echo "Hit <ENTER> to continue; <CTRL-C> to abort"
read
# perform all testcases (> 0 for individual tests)
echo 0 > "$dbg_path/${card%:*}/$card/test"
>--------


Lothar Waßmann
-- 
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