Up to now NVIDIA has just supported their proprietary Linux graphics driver for GeForce, Quadro, and Tesla hardware on Intel x86 and x86-64 architectures (and formerly for Itanium), but now ARM support is coming.
NVIDIA has announced their 319.xx driver (their current latest graphics series) is being ported to the ARMv7 instruction set with Thumb and hard floating-point. This ARM driver has feature-parity to the x86 driver and supports the same range of NVIDIA graphics processors.
News of this NVIDIA ARM Linux driver support was shared via NVIDIA Devtalk.
This news comes when the company just as well announced they would begin licensing their latest-generation Kepler architecture to SoC vendors. The only NVIDIA ARM driver up to now was for their own Tegra SoC and didn't support discrete GeForce hardware. Hopefully in the future the Tegra GPU will move closer to their mainline architecture and be able to benefit from a unified driver across all their mobile and desktop products.