It is now fully handled by the drm/i915 driver.
fe75dd5 agp: Remove support for Valleyview hardware
sys/dev/agp/agp_i810.c | 82 ------------------------------------------------
sys/dev/agp/agpreg.h | 10 ++----
2 files changed, 2 insertions(+), 90 deletions(-)
Upstream: gitweb.dragonflybsd.org