[U-Boot] Marvell Kirkwood newbie question GPIO functions

[Dieter Kiermaier]

> > -----Original Message-----
> > From: Dieter Kiermaier [mailto:dk-arm-linux at gmx.de]
> > Sent: Friday, June 19, 2009 3:17 PM
> > To: Prafulla Wadaskar
> > Cc: u-boot at lists.denx.de
> > Subject: Re: [U-Boot] Marvell Kirkwood newbie question GPIO functions
> >
> > Prafulla,
> >
> > (...deleted some stuff...)
> >
> > > > > What patches are in the pipeline?
> > >
> > > Some other board supports (MV88F6281GTW_GE) and Kirkwood SPI driver
> > > support Kirkwood USB support (at this moment)
> >
> > Also very interesting :)
> >
> > (...deleted, too...)
> >
> > > > What I forgot to mention is the i2c driver inside u-boot.
> > > > I need this to read the mac address from an additional eeprom.
> > > > This makes mass production more ease and doesn't produce
> >
> > hight costs
> >
> > > > :)
> > >
> > > Kirkwood has in-built i2c(TWSI) controller, well.. the plans are in
> > > place enable driver for it, but this is not blocking issue
> >
> > right now
> >
> > > hence pending ;-)
> > >
> > > Just FYI: you can protect some flash sector and use it in place of
> > > eeprom, this will lower the board cost and complexity too.
> > >
> > > But if you are planning to use some different GPIOs for i2c and
> > > bit-banged driver on the top of it, then you will need gpio
> >
> > control,
> >
> > > so you can do it by using simple readl/writel calls
> >
> > meanwhile driver
> >
> > > to come in :-)
> >
> > Yes, I thought about that, too. GPIO support will also be
> > helpful for doing this!
> > Do you have some snippets how to readl/writel by hand?
>
> You can refer kw_config_gpio function in cpu/arm926ejs/kirkwood/cpu.c

I will have a look and try this, thanks for the hint!

>
> > > The best way I will suggest you is:
> > > Put pre-programmed eeprom around Kirkwood TWSI interface and enable
> > >"TWSI  serial ROM initialization" you don't need anything else for
> > >this. (I hope  you are having enough kirkwood documentation)
> >
> > Ref: table 32:
> > >http://www.marvell.com/files/products/embedded_processors/kir
> >
> > kwood/HW_8
> >
> > >8F62
> > >81_OpenSource.pdf
> >
> > Good idea - I will read about that.
> > I've got access to all documents - including an marvell web
> > account for internal documents.
>
> That's very good...
>
> Regards..
> Prafulla . .
>
> > Regards,
> > Dieter
> >
> > > Regards..
> > > Prafulla . .
> > >
> > > > Dieter
> > > >
> > > > > > > I'm willing to contribute some code if someone
> >
> > guides me a bit?
> >
> > > > > > You are most welcomed....
> > > > > > Pls feel free to raise your queries...
> > > > >
> > > > > Here they are :)
> > > > > Thanks,
> > > > > Dieter
> > > > >
> > > > > > Regards..
> > > > > > Prafulla . .
> > > > > >
> > > > > > > Thanks in advance,
> > > > > > > Dieter
> > > > > > >
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