fbdev: add fb_read/fb_write functions for framebuffers in system RAM
The functions fb_read() and fb_write in fbmem.c 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/__raw_write (fb_readl/fb_writel) for these drivers is
illegal, especially in other platforms.
Create file read and write methods for these types of drivers. These are
named fb_sys_read() and fb_sys_write().
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>
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 6d32726..85d0e87 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -122,6 +122,11 @@
blitting. This is used by drivers that don't provide their own
(accelerated) version and the framebuffer is in system RAM.
+config FB_SYS_FOPS
+ tristate
+ depends on FB
+ default n
+
config FB_DEFERRED_IO
bool
depends on FB
