On Thursday 13 April 2006 1:32 am, Jan Veldeman wrote:
> The CY7C67300 has 2 SIE's with each 2 ports. The ports can (with some
> restrictions) be configured to be either host, peripheral or OTG.
That seems to be a common design in new non-PC hardware. The host
side driver may then need a lot of request scheduling code corresponding
to stuff done in hardware with {E,O,U}HCI on PCs.
> The structure I'll be using is 1 platform driver which controls the
> hardware and shared pieces, with on top of that a host and gadget
> driver.
And one puzzle would be the Kconfig ... that's a lot of code to get
working right (do the host side on 2.6.recent!), so I suggest you
have an explicit "Driver Mode" choice saying whether the board serves
in host role, peripheral role, or as an OTG device.
A three-component structure seems essential; the core should manage
fifos and DMA (and eventually OTG role management, in conjunction
with usbcore), and two c67300_{host,gadget}.c modules to handle the
host and peripheral side APIs. It might work well to have different
developers working in parallel on the host and peripheral sides, for
all the non-core-code.
> Are there already drivers with a similar interface/structure, or will
> this be the first one?
There's one for Mentor's HDRC RTL as used in certain chips; that driver
isn't quite ready for circulation yet. You could of course look at
the evolved-part-way-from-2.4 code Mentor provided[1] but that version
is especially nasty ... you'd want the one that's about 1/4 the size
and actually passes most Linux 2.6 tests.
- Dave
[1] http://www.mentor.com/products/ip/usb/usb20otg/usb-otg-driver.cfm
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