[PATCH] EHCI driver - USB 2.0 support

[Aleš Nesrsta]

Hi,

because I still see no EHCI driver in GRUB for long time, I slowly
prepared myself something what looks to be working...
EHCI driver code is based on UHCI (OHCI) GRUB driver, no other source
code was used (copied).

There are included two files:
ehci.c - The driver itself. It should be located on the same place as
uhci.c, ohci.c etc., i.e. in grub-core/bus/usb.
usb_ehci_110625_0 - Patch which includes changes in some other existing
files in GRUB. Patch was made against today's GRUB trunk revision 3350.

Limitations - see ehci.c.

Known issue:
USB keyboard (and probably any low speed HID device) is not working when
connected via USB 2.0 hub. I don't know why - control transfers are OK
but bulk transfer halts with STALL. Maybe USB 2.0 hub strictly
distinguishes between bulk / interrupt transfers when Split Transaction
is used. (?)

I shortly tested main functions:
- high speed device connected directly to EHCI port - working, OK
- low/full speed device connected directly to EHCI port - not working
but it is OK (it cannot work according to specification)
- high speed device connected via USB 2.0 hub - working, OK
- full speed device connected via USB 2.0 hub - working, OK
- low speed device connected via USB 2.0 hub - I have only keyboard and
it is not working - see known issue above.

I tried also test EHCI and UHCI drivers together - it also looks to be
working:
- full speed device connected directly to EHCI/UHCI port is working (via
UHCI driver), OK
- low speed device (keyboard) connected directly to EHCI/UHCI port is
working (via UHCI driver), OK

Best regards
Ales

ehci.c
Description: Text Data

usb_ehci_110625_0
Description: Text Data