drm/nouveau/fb/gf100-: declare constants as unsigned long long.

Explicitly declare constants as unsigned long long to address the
following sparse warnings:
warning: constant is so big it is long

v2: convert to unsigned long long for compatibility with 32-bit
architectures.

Signed-off-by: Wambui Karuga <wambui.karugax@gmail.com>
Suggested by: lia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drm/nouveau/fb/ram: remove old allocators

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drm/nouveau/fb/ram/nv40-: use new devinit script interpreter entry-point

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drm/nouveau/fb/gf100-: rework ram detection

This commit reworks the RAM detection algorithm, using RAM-per-LTC to
determine whether a board has a mixed-memory configuration instead of
using RAM-per-FBPA. I'm not certain the algorithm is perfect, but it
should handle all currently known configurations in the very least.

This should fix GTX 970 boards with 4GiB of RAM where the last 512MiB
isn't fully accessible, as well as only detecting half the VRAM on
GF108 boards.

As a nice side-effect, GP10x memory detection now reuses the majority
of the code from earlier chipsets.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drm/nouveau/fb/ram/gp100-: fix memory detection where FBP_NUM != FBPA_NUM

In this situation, we'd have ended up detecting less VRAM than we have.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drm/nouveau/fb/gp100: initial support

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>