I think the later Barefoot controllers were public enough, with the two different speed grades of Barefoot 3 being used in the OCZ Arc 100 and Vector 180 (which still exists as the VT180): http://www.anandtech.com/show/9009/ocz-vector-180-240gb-480g...

But it's a dead end and last I heard Toshiba doesn't plan on doing another revision of the silicon to update it with anything like support for SATA link power saving modes.