video: add driver for PXA3xx 2D graphics accelerator
This adds a driver for the the 2D graphics accelerator found on PXA3xx
processors. Only resource mapping, interrupt handling and a simple ioctl
handler is done by the kernel part, the rest of the logic is implemented
in DirectFB userspace.
Graphic applications greatly benefit for line drawing, blend, and
rectangle and triangle filling operations.
Benchmarks done on a PXA303 using the df_dok benchmarking tool follow,
where the value in square brackets show the CPU usage during that test.
Without accelerator (benchmarking 256x252 on 480x262 RGB16 (16bit)):
Signed-off-by: Daniel Mack <daniel@caiaq.de> Tested-by: Sven Neumann <s.neumann@raumfeld.com> Cc: Eric Miao <eric.y.miao@gmail.com> Cc: Denis Oliver Kropp <dok@directfb.org> Cc: Sven Neumann <s.neumann@raumfeld.com> Cc: Haojian Zhuang <haojian.zhuang@gmail.com> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>