Is anyone working on SD/MMC driver for i.MX35 ?

Is anyone working on SD/MMC driver for i.MX35 ?

[Hans J. Koch]

I need to get the MMC interface of an i.MX35 to work in the near future.
To avoid duplicate work, I'd like to know if anybody already started
work on this.

Any hints?

Thanks,
Hans

Re: Is anyone working on SD/MMC driver for i.MX35 ?

[Wolfram Sang]

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On Thu, Apr 01, 2010 at 03:22:35PM +0200, Hans J. Koch wrote:
> On Thu, Apr 01, 2010 at 03:20:17PM +0200, Daniel Mack wrote:
> > On Thu, Apr 01, 2010 at 02:57:40PM +0200, Hans J. Koch wrote:
> > > I need to get the MMC interface of an i.MX35 to work in the near future.
> > > To avoid duplicate work, I'd like to know if anybody already started
> > > work on this.
> > 
> > Is the controller very different from the one which is already supported
> > for MX31?
> 
> Yep. Completely different beast. Unfortunately.

(CCing linux-mmc)

And it is a mess, really :(

The kernel already has an esdhc-driver (and Anton already worked around a
number of hardware-bugs), but is tied into an of-driver because the core was
also used on PowerPC. There, it utilizes a 32-bit-byte-swaper which is not
needed on ARM. So, one has to rip all that out, generalize the sdhc-platform
support (possibly also abstract the quirk support) and make sure nothing
breaks.

I started and got MMC working, but it is by far not mainline quality (and maybe
bitrotten by now). Check the sdhci-pltfm branch at

http://git.pengutronix.de/?p=wsa/linux-2.6.git;a=summary

You see, there is still some of_* left in the platform-part.

Maybe you can push this a bit further,

   Wolfram

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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Re: Is anyone working on SD/MMC driver for i.MX35 ?

[Anton Vorontsov]

On Fri, Apr 02, 2010 at 03:29:32AM +0200, Wolfram Sang wrote:
> On Thu, Apr 01, 2010 at 03:22:35PM +0200, Hans J. Koch wrote:
> > On Thu, Apr 01, 2010 at 03:20:17PM +0200, Daniel Mack wrote:
> > > On Thu, Apr 01, 2010 at 02:57:40PM +0200, Hans J. Koch wrote:
> > > > I need to get the MMC interface of an i.MX35 to work in the near future.
> > > > To avoid duplicate work, I'd like to know if anybody already started
> > > > work on this.
> > > 
> > > Is the controller very different from the one which is already supported
> > > for MX31?
> > 
> > Yep. Completely different beast. Unfortunately.
> 
> (CCing linux-mmc)
> 
> And it is a mess, really :(
> 
> The kernel already has an esdhc-driver (and Anton already worked around a
> number of hardware-bugs), but is tied into an of-driver because the core was
> also used on PowerPC. There, it utilizes a 32-bit-byte-swaper which is not
> needed on ARM. So, one has to rip all that out, generalize the sdhc-platform
> support (possibly also abstract the quirk support) and make sure nothing
> breaks.

FYI, there is sdhci-pltfm driver, + some patches to add
quirks support:

http://lkml.org/lkml/2010/3/16/337

These patches are already in the -mm tree.

Thanks,

-- 
Anton Vorontsov
email: cbouatmailru@gmail.com
irc://irc.freenode.net/bd2

Re: Is anyone working on SD/MMC driver for i.MX35 ?

[Hans J. Koch]

On Mon, Apr 05, 2010 at 10:21:03PM +0400, Anton Vorontsov wrote:
> On Fri, Apr 02, 2010 at 03:29:32AM +0200, Wolfram Sang wrote:
> > On Thu, Apr 01, 2010 at 03:22:35PM +0200, Hans J. Koch wrote:
> > > On Thu, Apr 01, 2010 at 03:20:17PM +0200, Daniel Mack wrote:
> > > > On Thu, Apr 01, 2010 at 02:57:40PM +0200, Hans J. Koch wrote:
> > > > > I need to get the MMC interface of an i.MX35 to work in the near future.
> > > > > To avoid duplicate work, I'd like to know if anybody already started
> > > > > work on this.
> > > > 
> > > > Is the controller very different from the one which is already supported
> > > > for MX31?
> > > 
> > > Yep. Completely different beast. Unfortunately.
> > 
> > (CCing linux-mmc)
> > 
> > And it is a mess, really :(
> > 
> > The kernel already has an esdhc-driver (and Anton already worked around a
> > number of hardware-bugs), but is tied into an of-driver because the core was
> > also used on PowerPC. There, it utilizes a 32-bit-byte-swaper which is not
> > needed on ARM. So, one has to rip all that out, generalize the sdhc-platform
> > support (possibly also abstract the quirk support) and make sure nothing
> > breaks.
> 
> FYI, there is sdhci-pltfm driver, + some patches to add
> quirks support:
> 
> http://lkml.org/lkml/2010/3/16/337
> 
> These patches are already in the -mm tree.

Thanks a lot for all your hints! Will have a deeper look at that.

Thanks,
Hans

Re: Is anyone working on SD/MMC driver for i.MX35 ?

[Wolfram Sang]

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> Thanks a lot for all your hints! Will have a deeper look at that.

Any success?

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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Re: Is anyone working on SD/MMC driver for i.MX35 ?

[Hans J. Koch]

On Tue, Apr 27, 2010 at 01:04:39PM +0200, Wolfram Sang wrote:
> > Thanks a lot for all your hints! Will have a deeper look at that.
> 
> Any success?

I was delayed by some other project, don't know when I'll have something.

Hans

Re: Is anyone working on SD/MMC driver for i.MX35 ?

[Wolfram Sang]

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> > > Thanks a lot for all your hints! Will have a deeper look at that.
> > 
> > Any success?
> 
> I was delayed by some other project, don't know when I'll have something.

Meanwhile? I might need to touch it in the future again...

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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Re: Is anyone working on SD/MMC driver for i.MX35 ?

[Hans J. Koch]

On Tue, Aug 03, 2010 at 04:31:26PM +0200, Wolfram Sang wrote:
> > > > Thanks a lot for all your hints! Will have a deeper look at that.
> > > 
> > > Any success?
> > 
> > I was delayed by some other project, don't know when I'll have something.
> 
> Meanwhile? I might need to touch it in the future again...

No, sorry. I probably won't work on that anymore.

Thanks,
Hans