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, 22 insertions, 25 deletions

diff --git a/drivers/video/sysimgblt.c b/drivers/video/sysimgblt.c
index bd7e7e9d155f..88daa9b6f69a 100644
--- a/drivers/video/sysimgblt.c
+++ b/drivers/video/sysimgblt.c
@@ -23,30 +23,26 @@
 #define DPRINTK(fmt, args...)
 #endif
 
-static const u32 cfb_tab8[] = {
-#if defined(__BIG_ENDIAN)
+static const u32 cfb_tab8_be[] = {
     0x00000000,0x000000ff,0x0000ff00,0x0000ffff,
     0x00ff0000,0x00ff00ff,0x00ffff00,0x00ffffff,
     0xff000000,0xff0000ff,0xff00ff00,0xff00ffff,
     0xffff0000,0xffff00ff,0xffffff00,0xffffffff
-#elif defined(__LITTLE_ENDIAN)
+};
+
+static const u32 cfb_tab8_le[] = {
     0x00000000,0xff000000,0x00ff0000,0xffff0000,
     0x0000ff00,0xff00ff00,0x00ffff00,0xffffff00,
     0x000000ff,0xff0000ff,0x00ff00ff,0xffff00ff,
     0x0000ffff,0xff00ffff,0x00ffffff,0xffffffff
-#else
-#error FIXME: No endianness??
-#endif
 };
 
-static const u32 cfb_tab16[] = {
-#if defined(__BIG_ENDIAN)
+static const u32 cfb_tab16_be[] = {
     0x00000000, 0x0000ffff, 0xffff0000, 0xffffffff
-#elif defined(__LITTLE_ENDIAN)
+};
+
+static const u32 cfb_tab16_le[] = {
     0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff
-#else
-#error FIXME: No endianness??
-#endif
 };
 
 static const u32 cfb_tab32[] = {
@@ -72,7 +68,7 @@ static void color_imageblit(const struct fb_image *image, struct fb_info *p,
                 val = 0;
 
                 if (start_index) {
-                        u32 start_mask = ~(FB_SHIFT_HIGH(~(u32)0,
+                        u32 start_mask = ~(FB_SHIFT_HIGH(p, ~(u32)0,
                                                          start_index));
                         val = *dst & start_mask;
                         shift = start_index;
@@ -83,20 +79,20 @@ static void color_imageblit(const struct fb_image *image, struct fb_info *p,
                                 color = palette[*src];
                         else
                                 color = *src;
-                        color <<= FB_LEFT_POS(bpp);
-                        val |= FB_SHIFT_HIGH(color, shift);
+                        color <<= FB_LEFT_POS(p, bpp);
+                        val |= FB_SHIFT_HIGH(p, color, shift);
                         if (shift >= null_bits) {
                                 *dst++ = val;
 
                                 val = (shift == null_bits) ? 0 :
-                                        FB_SHIFT_LOW(color, 32 - shift);
+                                        FB_SHIFT_LOW(p, color, 32 - shift);
                         }
                         shift += bpp;
                         shift &= (32 - 1);
                         src++;
                 }
                 if (shift) {
-                        u32 end_mask = FB_SHIFT_HIGH(~(u32)0, shift);
+                        u32 end_mask = FB_SHIFT_HIGH(p, ~(u32)0, shift);
 
                         *dst &= end_mask;
                         *dst |= val;
@@ -125,8 +121,8 @@ static void slow_imageblit(const struct fb_image *image, struct fb_info *p,
         u32 i, j, l;
 
         dst2 = dst1;
-        fgcolor <<= FB_LEFT_POS(bpp);
-        bgcolor <<= FB_LEFT_POS(bpp);
+        fgcolor <<= FB_LEFT_POS(p, bpp);
+        bgcolor <<= FB_LEFT_POS(p, bpp);
 
         for (i = image->height; i--; ) {
                 shift = val = 0;
@@ -137,7 +133,8 @@ static void slow_imageblit(const struct fb_image *image, struct fb_info *p,
 
                 /* write leading bits */
                 if (start_index) {
-                        u32 start_mask = ~(FB_SHIFT_HIGH(~(u32)0,start_index));
+                        u32 start_mask = ~(FB_SHIFT_HIGH(p, ~(u32)0,
+                                                         start_index));
                         val = *dst & start_mask;
                         shift = start_index;
                 }
@@ -145,13 +142,13 @@ static void slow_imageblit(const struct fb_image *image, struct fb_info *p,
                 while (j--) {
                         l--;
                         color = (*s & (1 << l)) ? fgcolor : bgcolor;
-                        val |= FB_SHIFT_HIGH(color, shift);
+                        val |= FB_SHIFT_HIGH(p, color, shift);
 
                         /* Did the bitshift spill bits to the next long? */
                         if (shift >= null_bits) {
                                 *dst++ = val;
                                 val = (shift == null_bits) ? 0 :
-                                        FB_SHIFT_LOW(color,32 - shift);
+                                        FB_SHIFT_LOW(p, color, 32 - shift);
                         }
                         shift += bpp;
                         shift &= (32 - 1);
@@ -160,7 +157,7 @@ static void slow_imageblit(const struct fb_image *image, struct fb_info *p,
 
                 /* write trailing bits */
                 if (shift) {
-                        u32 end_mask = FB_SHIFT_HIGH(~(u32)0, shift);
+                        u32 end_mask = FB_SHIFT_HIGH(p, ~(u32)0, shift);
 
                         *dst &= end_mask;
                         *dst |= val;
@@ -199,10 +196,10 @@ static void fast_imageblit(const struct fb_image *image, struct fb_info *p,
 
         switch (bpp) {
         case 8:
-                tab = cfb_tab8;
+                tab = fb_be_math(p) ? cfb_tab8_be : cfb_tab8_le;
                 break;
         case 16:
-                tab = cfb_tab16;
+                tab = fb_be_math(p) ? cfb_tab16_be : cfb_tab16_le;
                 break;
         case 32:
         default: