How-to use the sdio driver?

[Lars Holowko]

Thanks Dan,

For the hint concerning debug and the MMC bus. I don't see anything
happening there with my wifi card.

One source of the problem could be that the MMC slot seems to get
scanned only at boot up. It only recognizes a SD card when it is already
plugged in when the kernel gets booted but not if I plug it in later.

By that time the libertas module is not loaded yet. But when I configure
libertas_sdio to be linked statically, I don't see any difference
either...

I also added a couple of printks in
drives/mmc/core/sdio_bus.c:sdio_bus_event and
drives/mmc/core/sdio_bus.c:sdio_bus_probe but they never seem to get
called either - neither with the SD card nor the wireless board. Do you
know who is supposed to call those probe functions?

Lars

-----Original Message-----
From: Dan Williams [mailto:dcbw at redhat.com] 
Sent: Thursday, July 09, 2009 8:17 AM
To: Lars Holowko
Cc: libertas-dev at lists.infradead.org
Subject: Re: How-to use the sdio driver?

On Wed, 2009-07-08 at 14:14 -0700, Lars Holowko wrote:
> Hi everyone,
> 
> I am trying to get to run the libertas SDIO driver to work on an Atmel

> AT91SAM9G20-EK eval board (linux-2.6.30.1).
> 
> After an insmod libertas_sdio.ko I see this on the console
> 
> libertas_sdio: Libertas SDIO driver
> libertas_sdio: Copyright Pierre Ossman
> 
> but obviously if_sdio_probe never gets called (I added a printk
there).
> 
> Is there anything else I have to do? I looked at 
> arch/arm/mach-at91/board-sam9g20ek.c and it looked like the default 
> configuration for the GPIO's look ok (I try to use the MCDB* GPIOS).

Load or build the MMC/SDIO stack modules with debugging.  If you don't
see a lot of log spew when the MMC/SDIO modules load, then obviously
libertas won't be able to find your card because the MMC bus doesn't
know about it.  You should also see stuff in /sys/bus/mmc/devices when
the card has actually been found.

Dan

> I think it would already help me if someone could outline for any 
> platform what needs to be done in general.
> 
> I would also appreciate if some could share an example how one can 
> activate the GSPI version (the docu for this on the website is a 
> little bit brief) - I want to compare the throughput that can be 
> achieved with both versions.
> 
> Thanks in advance,
> 
> Lars
>  
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