RE: [Linux-mips-kernel]Re: enabling usb-ohci on Alchemy Au1000?

[Joseph C. <jo...@id...>]

William A. Gatliff [mailto:bg...@bi...] wrote:

> Not sure what you mean by the "SA1100 version of the usb driver": that
> chip doesn't have USB Host, does it?

The SA-1100 has OHCI on it...  There's supposed to be a modified USB driver
out there with this.  Alas, in my shuffle to get lots of other things
working, I lost the chunk of code that would have generated nice patches
against a fairly recent SF tree.

Right now, what I have is a hodge podge of old HHL-tree derived source and
SF-tree.  My USB work was a proof-of-concept work for [a confidential party]
that I had to put together in a hurry.   If [they] want to proceed with the
project, I'll probably be asked to do some work for them, in which I case I
can make a proper(!) driver patch.

Joseph
-----Original Message-----
From:
Sent: Tuesday, October 29, 2002 9:14 PM
To: Joseph Chiu
Cc: lin...@li...
Subject: Re: [Linux-mips-kernel]Re: enabling usb-ohci on Alchemy Au1000?


Joseph:


On Tue, Oct 29, 2002 at 09:07:27PM -0800, Joseph Chiu wrote:
> I got it to work with my Au1000...  The problem turned out to be two-fold:
>
> 1) The "official" USB code with the PCI registration stuff needed to be
> modified.  The SA1100 version of the usb driver does this.  The MontaVista
> HHL JE-version of the USB drivers also does this.  I looked at those two,
> and hacked away until I did something quite similar.

Not sure what you mean by the "SA1100 version of the usb driver": that
chip doesn't have USB Host, does it?

/me starts downloading arm-linux...

> 2) I moved the USB peripheral setup code from setup.c to the init function
> in the USB driver...  After the USB peripheral setup (in setup.c), if too
> much time has elapsed, the USB driver-init functions die while trying to
> write to the OHCI registers.   By not turning on the USB peripherals until
> the USB driver was starting up, I avoided this problem.

Ok.  I'll take a look at that.

> My implementation is cruddy, and I'm not even sure if it's quite "right",
> but it did work for me.  Alas, I've been tied up with other work and some
> personal emergencies that I haven't had the chance to go back and make a
> patch, or even figure out what all the little details to what I did to get
> it to work.

I know about those personal emergencies, having been fighting a few of
my own lately as well...

I'm heavy into Au1500 work right now.  I'd be happy to try and package
up your work if I could get it working over here, maybe even get it
incorporated into the CVS tree.  Just send me anything.  :^)


Cheers,



b.g.



>
> Sorry ccjoe... I know I said I was going to make a tidy little package for
> this... Haven't gotten there yet. :(
>
> Joseph
> -----Original Message-----
> From: lin...@li...
> [mailto:lin...@li...]On Behalf Of
> William A. Gatliff
> Sent: Tuesday, October 29, 2002 8:36 PM
> To: lin...@li...
> Subject: [Linux-mips-kernel]Re: enabling usb-ohci on Alchemy Au1000?
>
>
> Guys:
>
>
> Any updates on this?  I have an Au1500 board (Cogent CSB250) that I'd
> love to get USB host functionality working on...
>
> Pete: do you have a contact at Alchemy/AMD for this code?
>
>
> Thanks!
>
> b.g.
>
> >On Sat, 2002-09-07 at 17:04, Joseph Chiu wrote:
> > > Hi,
> > > I am trying to use the usb-ohci driver with my Alchemy Au1000, but the
> > > driver won't load because it fails to register with an appropriate PCI
> > > device.
> > > What would be the way to get around this?   Am I supposed to "spoof"
> > > something to makes it look like the on-board OHCI controller is mapped
> to a
> > > PCI bus?  Or am I missing something?
> >
> > The usb code for Alchemy that we did (non pci devices) was not accepted
> > in the usb project, which is why it's not in sourceforge.  I think
> > someone at Alchemy (now AMD) recently our code and did some merging with
> > the sforge tree and got it working.  You might want to ping them and see
> > if you can get a tarball.
>
>
> --
> Bill Gatliff
> I'm an embedded GNU developer first, GNU instructor second.
> See http://billgatliff.com for details.
>
>
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--
Bill Gatliff
I'm an embedded GNU developer first, GNU instructor second.
See http://billgatliff.com for details.