[U-Boot] Marvell Kirkwood newbie question GPIO functions

[Prafulla Wadaskar]

> -----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

> 
> > 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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> 
>