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    SubjectRe: [BK PATCH] USB update for 2.6.3
    On Thu, 19 Feb 2004 23:03:31 -0800 (PST)
    Linus Torvalds <> wrote:

    > On Fri, 20 Feb 2004, Benjamin Herrenschmidt wrote:
    > >
    > > > Well, we do. The pcibios_xxx routines get called for all PCI devices
    > > > during discovery, and that's when you'd fill them in.
    > >
    > > But what about USB or FireWire devices ? In theory, I'd like to see
    > > the driver for those not have to bother about beeing hosted by a PCI
    > > device or whatever else (there are typically non-PCI OHCI USBs on
    > > embedded platform, faking a pci_dev is becoming painful).
    > Well, a USB device can't actually do DMA, so .. (it's only the USB _host_
    > that does DMA, and while those aren't always PCI, they normally are).

    You miss how all of this stuff is being used :-)

    USB drivers do things like map DMA memory, and the generic DMA layer vectors it
    so that if the USB device is attached to a PCI host the PCI DMA mapping routines
    get used.
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