Re: GPIO on the Au1500

[Charles Eidsness <charles.eidsness@xxxxxxxx>]

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
> > > >>>
> > > >>>
> > > >>>
> > > >>
> > > > > >