Re: USB 2.0 Host controller chip for Linux
- From: "Michael N. Moran" <mnmoran@xxxxxxxxxxxxx>
- Date: Tue, 29 Jan 2008 20:46:24 -0500
Steve wrote:
Hi,
I have some confusion over the degree of SW/HW
interaction in USB Host controllers.
There is a lot of both.
I have an FPGA design which runs Windriver Linux. I would
like to add to the PCB a USB 2.0 host controller chip
whose sole purpose in life is to perform everything
required to get from the PHY to EHCI. I would then like
to map the EHCI registers to the Linux kernel; so that I should not have to write a device driver. Linux should
handle the majority of the USB protocol's signalling and
the chip the majority of the physical layer stuff.
Is the above valid?
Seems reasonable.
It seems, however, that whenever I try and search for
such a chip, I either get 1) monolithic peripheral/device
chip (that I do not want) 2) Host chips with a PCI
interface (which are okay, but I would like one
specifically designed with a host interface), 3) Some
intermediate chip, either a USB host but without the EHCI
interface, or a large and costly microcontroller.
Obviously, most USB Host controllers are aimed at the
PC market... but then the software stack for a USB host
is ... large. Even without the individual class/peripheral
drivers.
Unless you want to write a *lot* of driver software, you
definitely want to have a host controller with an ECHI
compliant interface. (Or OHCI for USB 1.1)
The question I have therefore is that, given my
understanding of the problem and assuming it is correct,
what chip can I get to fit this role?
If a PCI interface is OK, then use that ... that will
let you take advantage of the PC market and keep the
costs down, although I image that ECHI host controllers
are being built into the supporting chip sets these
days.
good luck,
mike
--
Michael N. Moran (h) 770 516 7918
5009 Old Field Ct. (c) 678 521 5460
Kennesaw, GA, USA 30144 http://mnmoran.org
"So often times it happens, that we live our lives in chains
and we never even know we have the key."
"Already Gone" by Jack Tempchin (recorded by The Eagles)
The Beatles were wrong: 1 & 1 & 1 is 1
.
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- USB 2.0 Host controller chip for Linux
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