[U-Boot] USB Host driver for ISP1362?

[Steve Strobel]

On Wed, Oct 17, 2012 at 2:48 AM, Wolfgang Denk <wd at denx.de> wrote:
>
> CONFIG_ISP1362_USB is an option used only in the respective board
> config files, used there to set up a mapping for the respective
> device memory; if enabled, we define CONFIG_SYS_BR5_ISP1362 and
> CONFIG_SYS_OR5_ISP1362 which are then used in the code to program the
> memory controller of the SoC used on these boards as needed; see
> "board/tqc/tqm8xx/tqm8xx.c"

That part is clear to me.  I don't think I need to do that on the
Blackfin, as the
external chip selects have pre-defined addresses (and it doesn't have a MMU).

>> ...And there is no way it could work without using them as the
>> ISP1362 sits on the data bus as a memory-mapped part and
>> the driver would need to know where to find it.
>
> Well, the memory controller does get programmed for a valid mapping,
> see "board/tqc/tqm8xx/tqm8xx.c"...this really
> only makes sure the device is mapped at the right address.  But you
> are right - I don't even see USB enabled in the NSCU board config
> file.  eventually all that gets done is setting up the memory
> controller (for later use in Linux?).

Now that you mention it, it makes sense that they are just setting
things up for later use in Linux.  I guess I followed a major bunny
trail thinking it did more.

If I were to pursue adding ISP1362 support to U-Boot, would it be best
to port the Linux driver or is there another way?  Would that support
need to be built on top of something else like EHCI, or would it sit
in parallel with it?  FWIW, I think that the ISP1362 Linux driver
supports only host mode (not gadget or OTG).

Thank you very much for clearing up my confusion and ending my search
for the driver that apparently doesn't exist.

Steve

-- 
Steve Strobel
Link Communications, Inc.
1035 Cerise Rd
Billings, MT 59101-7378
(406) 245-5002 ext 102
(406) 245-4889 (fax)
WWW: http://www.link-comm.com
MailTo:steve.strobel at link-comm.com