Re: GPIO on the Au1500

["Gilad Rom" <gilad@xxxxxxxxx>]

Thanks Charles.

First of all, I managed to get it working today,
(mmapping /dev/mem) so it is possible ;)

Secondly, I am using the GPIO ports for our own custom
design, so I am not exposing /dev/mem to all kinds
of nasty userland apps.

Gilad.

----- Original Message ----- 
From: "Charles Eidsness" <charles.eidsness@xxxxxxxx>
To: "Gilad Rom" <gilad@xxxxxxxxx>
Cc: <linux-mips@xxxxxxxxxxxxxx>
Sent: Monday, November 15, 2004 6:17 PM
Subject: Re: GPIO on the Au1500


> Hi Gilad,
>
> I'd be really surprised if it's possible. I think that those addresses are 
> beyond the valid physical address range for the mem driver. Even if it did 
> work I personally wouldn't feel comfortable doing that sort of thing. You 
> could inadvertently cause a lot of nasty things to happen. Maybe someone 
> else has a different (better) opinion.
>
> If you do use my driver I uploaded the wrong header file yesterday. I've 
> now uploaded the correct one.
>
> Cheers,
> Charles
>
> Gilad Rom wrote:
> > Thank you for the driver, I'm using it as a reference.
> >
> > Still, I am trying to acccess the GPIO ports of the Au1500
> > using /dev/mem, but I keep getting these odd values
> > (see previous messages to this list)
> >
> > Do you think it is possible, or should I stick to using the driver?
> >
> >
> > Thank you,
> > Gilad.
> >
> > ----- Original Message ----- From: "Pete Popov" 
> > <ppopov@xxxxxxxxxxxxxxxxx>
> > To: <charles.eidsness@xxxxxxxx>; "Gilad Rom" <gilad@xxxxxxxxx>
> > Cc: <linux-mips@xxxxxxxxxxxxxx>
> > Sent: Sunday, November 14, 2004 8:45 PM
> > Subject: Re: GPIO on the Au1500
> >
> >
> > > --- Charles Eidsness <charles.eidsness@xxxxxxxx>
> > > wrote:
> > >
> > > > Hi Gilad,
> > > >
> > > > A little while ago I wrote my own GPIO driver for
> > > > the Au1000, mainly as a learning experience. I never bothered to 
> > > > release it because a driver already exists and I thought it was 
> > > > working.
> > >
> > >
> > > It was, a long time ago, when it was written for the
> > > Au1000. I had a user app and doc somewhere but can't
> > > find it anymore. The driver didn't support gpio2 and
> > > was, in general, stale. So perhaps your driver will
> > > help Gilad.
> > >
> > > Pete
> > >
> > > > I'm not sure if it will work on the Au1550, but if you're interested 
> > > > you can
> > > > find the source code here:
> > > http://members.rogers.com/charles.eidsness/au1000_gpio.c
> > >
> > > >
> > > http://members.rogers.com/charles.eidsness/au1000_gpio.h
> > >
> > > > Cheers,
> > > > Charles
> > > >
> > > > Gilad Rom wrote:
> > > > > Thanks. Can't I just mmap /dev/mem and use the
> > > > > GPIO offset from SYS_BASE?
> > > > > > Gilad.
> > > > > > ----- Original Message ----- From: "Pete Popov"
> > > > <ppopov@xxxxxxxxxxxxxxxxx>
> > > > > To: "Gilad Rom" <gilad@xxxxxxxxx>;
> > > > <linux-mips@xxxxxxxxxxxxxx>
> > > > > Sent: Friday, November 12, 2004 8:13 PM
> > > > > Subject: Re: GPIO on the Au1500
> > > > > > >>
> > > > >> --- Gilad Rom <gilad@xxxxxxxxx> wrote:
> > > > >>
> > > > >>> Hello,
> > > > >>>
> > > > >>> I am trying to use the au1000_gpio driver, but
> > > > I'm a
> > > > >>> little clueless as to how it is meant to be
> > > > used. Can I use the GPIO >>> ioctl's from a userland program, or must I 
> > > > write
> > > > a kernel module?
> > > > >>
> > > > >>
> > > > >> I'll see if I can dig up some docs and the
> > > > example
> > > > >> userland program this weekend. That driver hasn't
> > > > been
> > > > >> tested in a while though.
> > > > >>
> > > > >> Pete
> > > > >>
> > > > >>> Thank you,
> > > > >>> Gilad Rom
> > > > >>> Romat Telecom
> > > > >>>
> > > > >>>
> > > > >>>
> > > > >>
> > > > > > >