On Thu, 2011-04-07 at 02:54 +0200, RafaÅ MiÅecki wrote: > W dniu 7 kwietnia 2011 02:00 uÅytkownik George Kashperko > <george@xxxxxxxxxxx> napisaÅ: > > For PCI function description take a look at PCI specs or PCI > > configuration space description (e. g. > > http://en.wikipedia.org/wiki/PCI_configuration_space) > > > > Sorry for missleading short-ups, w11 - bcm80211 core, under two-head I > > mean ssb/axi with two functional cores on same interconnect (like w11 > > +w11, not a lot of these exists I guess). Also there were some b43+b44 > > on single PCI ssb host and those where implemented as ssb interconnect > > on multifunctional PCI host therefore providing separate access windows > > for each function. > > > > Might I mussunderstood something (its late night here at my place) when > > you where talking about using coreswitching involved for two drivers > > therefore I remembered about those functions. Seems now you were talking > > about chipcommon+b43 access sharing same window. > > > > As for core switching requirments for earlier SSB interconnects on PCI > > hosts where there were no direct chipcommon access, that one can be > > accomplished without spin_lock/mutex for b43 or b44 cores with proper > > bus design. > > > > AXI doesn't need spinlocks/mutexes as both chipcommon and pci bridge are > > available directly and b43 will be the only one requiring window access. > > Ahh, so while talking about 4 windows, I guess you counted fixes > windows as well. That would be right, matching my knowledge. > > When asking question about amount of cores we may want to use > simultaneously I didn't think about ChipCommon or PCIe. The real > problem would be to support for example two 802.11 cores and one > ethernet core at the same time. That gives us 3 cores while we have > only 2 sliding windows. Would that really be a problem? Think of it. This combination will only be available on embedded devices. But do we have windows on embedded devices? I guess not. If AXI is similar to SSB, the MMIO of all cores will always be mapped. So accesses can be done without switch or lock. I do really think that engineers at broadcom are clever enough to design a hardware that does not require expensive window sliding all the time while operating. -- Greetings Michael. -- 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
