W dniu 17 kwietnia 2011 19:38 uÅytkownik Arnd Bergmann <arnd@xxxxxxxx> napisaÅ: > On Friday 15 April 2011, RafaÅ MiÅecki wrote: >> W dniu 15 kwietnia 2011 20:36 uÅytkownik George Kashperko >> <george@xxxxxxxxxxx> napisaÅ: >> >> >> Arnd: I found you saying: >> >> >> > I believe the one thing we really want from this driver is the bus >> >> >> > scan code, which is not present in the amba bus implementation, >> >> >> I explained how it works, I believe scanning (EPROM in this case) it >> >> >> Broadcom specific, not really AMBA standard. How do you see it? >> >> >> >> Maybe EPROM is not Broadcom specific, but I suspect the content we >> >> deal with in bcmai/axi is Broadcom specific. I didn't see any notes of >> >> manuf/id/rev/class we deal with. So I guess everything we (out >> >> driver) read from EPROM is Bcm specific. >> >> >> > >> > Played around amba registers on bcm4716. For all amba cores present >> > (under all I mean broadcom ip core agents, oob router core, erom core, >> > and other I-dont-know-what-for cores present at 0x18100000). All those >> > feature AMBA_CID (0xb105f00d) as PrimeCell ID, and slightly different >> > PrimeCell PeripheralIDs: >> > * vendor 0xBB, part_number 0x368 for broadcom cores' agents; >> > * vendor 0xBB, part_number 0x367 for OOB router core (don't ask me wth >> > is this please); >> > * vendor 0xBB, part_number 0x366 for EROM core; >> > >> > ARM vendor id is 0x41. Might 0xBB is Broadcom vendor id but I've found >> > no evidence for that with google. >> >> Yeah, as I suspected, everything except Broadcom specific cores >> matches AMBA standards quite nicely. Still, I don't see anything in it >> we could use for driver. >> >> Let's wait for Russell and Arnd to comment. > > In general, the bus_type directly relates to how a device gets probed. > If broadcom uses the same basic register layout as regular AMBA devices, > it should use the amba bus type. >From Broadcom side we *could* use some registers that are AMBA specific, they are present... but there is totally no point in doing that. Everything we use is Broadcom specific. > I think it would be fine to extend the AMBA bus slightly if there are > just minor differences. As I said, Broadcom specific driver use nothing from AMBA common things. Plus we implement routines that are Broadcom specific and no other platform will use them. -- RafaÅ -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
