From: "David S. Miller" <davem@redhat.com>
To: Linus Torvalds <torvalds@osdl.org>
Cc: benh@kernel.crashing.org, greg@kroah.com, akpm@osdl.org,
linux-usb-devel@lists.sourceforge.net,
linux-kernel@vger.kernel.org
Subject: Re: [BK PATCH] USB update for 2.6.3
Date: Thu, 19 Feb 2004 23:04:07 -0800 [thread overview]
Message-ID: <20040219230407.063ef209.davem@redhat.com> (raw)
In-Reply-To: <Pine.LNX.4.58.0402192257190.1107@ppc970.osdl.org>
On Thu, 19 Feb 2004 23:03:31 -0800 (PST)
Linus Torvalds <torvalds@osdl.org> 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.
next prev parent reply other threads:[~2004-02-20 7:04 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-20 1:28 [BK PATCH] USB update for 2.6.3 Greg KH
2004-02-20 5:58 ` Linus Torvalds
2004-02-20 6:03 ` Benjamin Herrenschmidt
2004-02-20 6:30 ` Linus Torvalds
2004-02-20 6:28 ` Benjamin Herrenschmidt
2004-02-20 6:47 ` Linus Torvalds
2004-02-20 6:42 ` Benjamin Herrenschmidt
2004-02-20 7:00 ` Greg KH
2004-02-20 7:06 ` Benjamin Herrenschmidt
2004-02-20 7:58 ` [linux-usb-devel] " David Brownell
2004-02-20 7:03 ` Linus Torvalds
2004-02-20 7:04 ` David S. Miller [this message]
2004-02-20 7:10 ` Benjamin Herrenschmidt
2004-02-20 7:32 ` David S. Miller
2004-02-20 15:15 ` Linus Torvalds
2004-02-20 18:15 ` Hollis Blanchard
2004-02-20 18:39 ` Linus Torvalds
2004-02-20 19:20 ` Hollis Blanchard
2004-02-20 19:32 ` Linus Torvalds
2004-02-20 22:40 ` [linux-usb-devel] " Benjamin Herrenschmidt
2004-02-20 19:30 ` Alan Stern
2004-02-20 7:08 ` Benjamin Herrenschmidt
2004-02-20 8:08 ` David Brownell
2004-02-20 9:26 ` Russell King
2004-02-20 7:40 ` Deepak Saxena
2004-02-20 7:47 ` [linux-usb-devel] " Benjamin Herrenschmidt
2004-02-20 8:08 ` Deepak Saxena
2004-02-20 8:43 ` David Brownell
2004-02-20 8:48 ` Benjamin Herrenschmidt
2004-02-20 9:27 ` Russell King
[not found] <fa.d7mjamc.1l40pri@ifi.uio.no>
2004-02-20 6:34 ` Andy Lutomirski
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