[U-Boot] Porting ehci-exynos.c to handle exynos4412 (odroid-u2)

[Lukasz Majewski]

On Mon, 8 Jul 2013 11:03:05 -0700
Suriyan Ramasami <suriyan.r at gmail.com> wrote:

> Hello Lukasz,
>    Thanks for your response. I guess I was not very clear with my
> question.
> 
>    u-boot code already exists for the odroid-u2 (that is what it
> uses). 

So I assume that the u-boot code was the part of the BSP?
The problem then seems to be with enabling and building the usb code?

Another question is, how close your odroid's u-boot is to the mainline?
Which version of u-boot do you have? 

> Unfortunately, it does not have USB support. I am looking at
> just adding the EHCI and USB (uses a 3503A) part of the code.
> 
>    I checked the TRATS2 patch and it too does not have any code that
> touches the USB part of things.

This is true. We aren't using EHCI (USB Host). Instead we are
supporting USB Device + Composite layer + Gadgets (like DFU + UMS).
Support for those devices is "almost" in mainline :-).

Regards,
Lukasz Majewski

> 
> Thanks
> - Suriyan
> 
> 
> On Sun, Jul 7, 2013 at 11:56 PM, Lukasz Majewski
> <l.majewski at samsung.com>wrote:
> 
> > On Sun, 07 Jul 2013 02:15:17 -0700, Suriyan Ramasami wrote:
> >
> > Hi Suriyan,
> >
> > > Hi wonderful folks!
> > >
> > >     I own an odroid-u2 and the u-boot that comes with it does not
> > > have usb support. Its configuration is smdk4412 and I do not find
> > > that in the u-boot sources. I see it in the arndale and harkernel
> > > branches.
> > >
> > >    I do see that usb support was added to the arndale platform -
> > > which is exynos5 based. Is it easy to port it for exynos4412?
> >
> > Patches for Exynos4412 based board (TRATS2) were already sent on the
> > mailing list:
> >
> >
> > http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/161578/match=introduce+samsung's+new+board+trats2
> >
> > Please refer to them. It shall be relatively easy to add odroid-u2
> > support based on TRATS2.
> >
> > >
> > >    I did try it porting on my own accord and am listing it
> > > below...
> > >
> > >    I seem to be hitting issues in drivers/usb/host/ehci-exynos.c
> > > -> function setup_usb_phy(struct exynos_usb_phy *usb).
> > > Would passing the correct address of usb for the exynos4412 do the
> > > trick? If so what should it be?
> > >   In this same file ehci_hcd_init() uses gpio->x3 and gpio->d1. In
> > > exynos4 looks like x3 is from gpio_part2. Also, do the d1 and x3
> > > translate to the same gpiod1 and gpiox3 in the exynos4412?
> > >
> > > Furthermore, ehci-exynos.c uses functions from
> > > arch/arm/cpu/armv7/exynos/system.c which for the most part  are
> > > exynos5 oriented and do nothing for exynos4.
> > >
> > > Can someone guide me as to what I could do, or some pointers to
> > > helpful docs? I do have the Exynos 4412 user manual.
> > >
> > > Thanks
> > > - Suriyan
> >
> >
> > --
> > Best regards,
> >
> > Lukasz Majewski
> >
> > Samsung R&D Institute Poland (SRPOL) | Linux Platform Group
> >