Replying to EF/EF-S Canon Adapter to EF-M Mount

I really enjoy astrophotography and landscape photography, so I'm looking at getting an ultra wide lens like the 11-16mm Tokina f/2.0 or the Rokinon 12mm f/2.0. The thing is, if I want the f/2.0's, I need to find an adapter because they only come in the M Mounts. Otherwise I'll have to get the f/2.8.

Does anyone know of an adapter from EF/EF-S to the old M Mount? I've found the reverse, but nothing that I'm trying to find.

Thanks for the help!