fbdev: add drawing functions for framebuffers in system RAM

The generic drawing functions (cfbimgblt, cfbcopyarea, cfbfillrect) assume
that the framebuffer is in IO memory.  However, we have 3 drivers (hecubafb,
arcfb, and vfb) where the framebuffer is allocated from system RAM (via
vmalloc). Using _raw_read/write and family for these drivers (as used in
the cfb* functions) is illegal, especially in other platforms.

Create 3 new drawing functions, based almost entirely from the original
except that the framebuffer memory is assumed to be in system RAM.
These are named as sysimgblt, syscopyarea, and sysfillrect.

Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index d9aed1033442..f0bc5d908e2c 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -95,6 +95,33 @@ config FB_CFB_IMAGEBLIT
           blitting. This is used by drivers that don't provide their own
           (accelerated) version.
 
+config FB_SYS_FILLRECT
+        tristate
+        depends on FB
+        default n
+        ---help---
+          Include the sys_fillrect function for generic software rectangle
+          filling. This is used by drivers that don't provide their own
+          (accelerated) version and the framebuffer is in system RAM.
+
+config FB_SYS_COPYAREA
+        tristate
+        depends on FB
+        default n
+        ---help---
+          Include the sys_copyarea function for generic software area copying.
+          This is used by drivers that don't provide their own (accelerated)
+          version and the framebuffer is in system RAM.
+
+config FB_SYS_IMAGEBLIT
+        tristate
+        depends on FB
+        default n
+        ---help---
+          Include the sys_imageblit function for generic software image
+          blitting. This is used by drivers that don't provide their own
+          (accelerated) version and the framebuffer is in system RAM.
+
 config FB_DEFERRED_IO
         bool
         depends on FB