fb: add support for foreign endianness

Add support for the framebuffers with non-native endianness.  This is done via
FBINFO_FOREIGN_ENDIAN flag that will be used by the drivers.  Depending on the
host endianness this flag will be overwritten by FBINFO_BE_MATH internal flag,
or cleared.

Tested to work on MPC8360E-RDK (BE) + Fujitsu MINT framebuffer (LE).

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: <Valdis.Kletnieks@vt.edu>
Cc: Clemens Koller <clemens.koller@anagramm.de>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 13 insertions, 10 deletions

diff --git a/drivers/video/cfbcopyarea.c b/drivers/video/cfbcopyarea.c
index b07e419b12d2..df03f3776dcc 100644
--- a/drivers/video/cfbcopyarea.c
+++ b/drivers/video/cfbcopyarea.c
@@ -44,15 +44,16 @@
      */
 
 static void
-bitcpy(unsigned long __iomem *dst, int dst_idx, const unsigned long __iomem *src,
-        int src_idx, int bits, unsigned n, u32 bswapmask)
+bitcpy(struct fb_info *p, unsigned long __iomem *dst, int dst_idx,
+                const unsigned long __iomem *src, int src_idx, int bits,
+                unsigned n, u32 bswapmask)
 {
         unsigned long first, last;
         int const shift = dst_idx-src_idx;
         int left, right;
 
-        first = fb_shifted_pixels_mask_long(dst_idx, bswapmask);
-        last = ~fb_shifted_pixels_mask_long((dst_idx+n) % bits, bswapmask);
+        first = fb_shifted_pixels_mask_long(p, dst_idx, bswapmask);
+        last = ~fb_shifted_pixels_mask_long(p, (dst_idx+n) % bits, bswapmask);
 
         if (!shift) {
                 // Same alignment for source and dest
@@ -202,8 +203,9 @@ bitcpy(unsigned long __iomem *dst, int dst_idx, const unsigned long __iomem *src
      */
 
 static void
-bitcpy_rev(unsigned long __iomem *dst, int dst_idx, const unsigned long __iomem *src,
-                int src_idx, int bits, unsigned n, u32 bswapmask)
+bitcpy_rev(struct fb_info *p, unsigned long __iomem *dst, int dst_idx,
+                const unsigned long __iomem *src, int src_idx, int bits,
+                unsigned n, u32 bswapmask)
 {
         unsigned long first, last;
         int shift;
@@ -221,8 +223,9 @@ bitcpy_rev(unsigned long __iomem *dst, int dst_idx, const unsigned long __iomem
 
         shift = dst_idx-src_idx;
 
-        first = fb_shifted_pixels_mask_long(bits - 1 - dst_idx, bswapmask);
-        last = ~fb_shifted_pixels_mask_long(bits - 1 - ((dst_idx-n) % bits), bswapmask);
+        first = fb_shifted_pixels_mask_long(p, bits - 1 - dst_idx, bswapmask);
+        last = ~fb_shifted_pixels_mask_long(p, bits - 1 - ((dst_idx-n) % bits),
+                                            bswapmask);
 
         if (!shift) {
                 // Same alignment for source and dest
@@ -404,7 +407,7 @@ void cfb_copyarea(struct fb_info *p, const struct fb_copyarea *area)
                         dst_idx &= (bytes - 1);
                         src += src_idx >> (ffs(bits) - 1);
                         src_idx &= (bytes - 1);
-                        bitcpy_rev(dst, dst_idx, src, src_idx, bits,
+                        bitcpy_rev(p, dst, dst_idx, src, src_idx, bits,
                                 width*p->var.bits_per_pixel, bswapmask);
                 }
         } else {
@@ -413,7 +416,7 @@ void cfb_copyarea(struct fb_info *p, const struct fb_copyarea *area)
                         dst_idx &= (bytes - 1);
                         src += src_idx >> (ffs(bits) - 1);
                         src_idx &= (bytes - 1);
-                        bitcpy(dst, dst_idx, src, src_idx, bits,
+                        bitcpy(p, dst, dst_idx, src, src_idx, bits,
                                 width*p->var.bits_per_pixel, bswapmask);
                         dst_idx += bits_per_line;
                         src_idx += bits_per_line;