Alan Stern wrote: > On Sun, 7 Feb 2010, Albert Herranz wrote: > >> The wii has no uhci, but has 2 ohci controllers. >> For ohci we need a similar approach as done for ehci. > > So you'll need to write a patch splitting up the OHCI data structures > in the same way the EHCI qh was split up. >
Yes. >> It turns out that we have more limitations. >> The wii has 2 discontiguous memory areas (usually called MEM1 and MEM2). I >> have checked that the ehci controller doesn't work properly when performing >> dma to buffers allocated in MEM1 (it corrupts part of the data) but has no >> problems if the buffers sit within MEM2. >> So usb buffers will need to be bounced anyway if they are part of MEM1. > > This sounds like the sort of restriction that dma_map_single() should > be capable of handling. > On powerpc you can have per-device specific dma ops. I'll work on that direction and create a special dma ops set for devices which need their dma buffers on mem2, and then use those for ehci-hlwd. > Alan Stern > Thanks, Albert _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
