lkml.org 
[lkml]   [2008]   [Nov]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: EHCI "on the go"
Miguel Ángel Álvarez wrote:
> Hi.
>
> Due to some problems with the EHCI in an IXP465, I have found that
> this micro has an "on the go" feature. One of its features seems to be
> an "Embedded Transaction Translator", that seems to be quite
> "propietary".
>
> I see in ehci.h, that using CONFIG_USB_EHCI_ROOT_HUB_TT, a function
> called "ehci_port_speed" has been added, and the comments suggest to
> implement the particularities of each controller with other functions.
>
> The question is:
> - Are there many different implementations (it seems there are not,
> because I cannot see code for each of them... unless they are so
> particular that they do not even use the general interface)?
> - Is there any place comparing the similarities / differences between them?
>

I only know of one interface for this, which is based on hardware IP I
believe is currently owned by ChipIdea. It's pretty straightforward; it
functionally does the same translation for the root port as a separate
hub would do for a full speed/low speed downstream port.

-hpa
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2008-11-10 18:51    [W:0.035 / U:0.664 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site