linux-kernel - Re: Block request processing for MMC/SD over SPI bus

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Message-Id: <200608081707.26003.hans@rubico.se>
Date:	Tue, 8 Aug 2006 17:07:25 +0200
From:	Hans Eklund <hans@...ico.se>
To:	David Brownell <david-b@...bell.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Block request processing for MMC/SD over SPI bus

On Tuesday 01 August 2006 10:42, Russell King wrote:
> On Tue, Aug 01, 2006 at 10:37:27AM +0200, Hans Eklund wrote:
> > The driver is also independent of any previous MMC related work at this
> > point since MMC over SPI mode differs somewhat from the MMC mode.
>
> You may be interested to know that David Brownell (I believe) has a
> driver which connects the SPI framework to the MMC subsystem, allowing
> the MMC subsystem to talk to cards in SPI mode.
>
> Maybe David can help, or point you in the direction of someone who
> can in the case that I'm misremembering.

Hi again Russel.

I have been talking to David Brownell and some other developers connected to 
ADI(Analgo devices) about the SPI to MMC subsystem driver. That idea will 
probably be implemented in a later phase. For now, i will complete my MMC/SD 
driver that connects to the common SPI framwork and will remain independent 
of the MMC subsystem so it can be used on uClinux platforms(ADI Blackfin 
based to a start) sooner.

For that reason am i talking to you. By a mere coincidence i saw that you are 
the author of /drivers/mmc/mmc_queue.c driver and hence i guess you have some 
knowledge regarding request processing that may be useful to the project.

I would say my driver need some attention to that particular part. And i would 
appreciate any help. As of now, it is a very naive way of walking the request 
queue(a la LDD handbook) and it need to support some basic error handling.

I have posted a copy of the make_request implementation here(~150 lines):

http://hasse.yohoo.nu/strat.txt

It is quite extesively commented, and some important questions at the end.
Hope you can have look at it and maybe give me a guideline.

If you dont have the time, i understand, maybe you know someone who has?

best regards

Hans Eklund,
Rubico AB, www.rubico.se
Sweden.

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