All,
Juniper Networks wrote a driver for the EHCI UCB HC and I'd like to contribute that back if there's interest. Besides a new piece of code, this also changes some of the common USB code so that high-speed devices and split-transactions are supported.
At this time the EHCI driver is exclusive in that there's no support for having the companion controller active. I presume this is one of the major themes for adding EHCI support, so that's definitely open for discussion.
Attached a patch with the common code changes as well as the EHCI driver itself. The patch does not contain any changes to get it built (i.e. included in libusb, etc). A seasoned U-Boot developer should have no problem playing with it, while the details are being worked out for getting this alongside a USB 1.1 HC driver.
Comments and suggestions are welcome. Please let me know how best to move forward with adding this to U-Boot, provided there's interest. FYI,