it seems that ati/amd will not
open source their drivers:
We've always supported open source, and for relevant markets such as servers, we release open source drivers so that companies such as Red Hat can include them in their distros.However, for other markets, such as workstation and consumer, performance and feature differentiation are key metrics. Proprietary, patented optimizations are part of the value we provide to our customers and we have no plans to release these drivers to open source. In addition, multimedia elements such as content protection must not, by their very nature, be allowed to go open source.
note: this reply was from ATI, AMD still has not responded to this questions, but it will be similar