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fb: add support for foreign endianness

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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>
This commit is contained in:
Anton Vorontsov
2008-04-28 02:14:49 -07:00
committed by Linus Torvalds
parent 6b745b6fd0
commit e4c690e061
10 changed files with 228 additions and 140 deletions
Download Patch File Download Diff File Expand all files Collapse all files

44
include/linux/fb.h
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@@ -791,6 +791,17 @@ struct fb_tile_ops {
*/
#define FBINFO_MISC_ALWAYS_SETPAR 0x40000
/*
* Host and GPU endianness differ.
*/
#define FBINFO_FOREIGN_ENDIAN 0x100000
/*
* Big endian math. This is the same flags as above, but with different
* meaning, it is set by the fb subsystem depending FOREIGN_ENDIAN flag
* and host endianness. Drivers should not use this flag.
*/
#define FBINFO_BE_MATH 0x100000
struct fb_info {
int node;
int flags;
@@ -899,15 +910,11 @@ struct fb_info {
#endif
#if defined (__BIG_ENDIAN)
#define FB_LEFT_POS(bpp) (32 - bpp)
#define FB_SHIFT_HIGH(val, bits) ((val) >> (bits))
#define FB_SHIFT_LOW(val, bits) ((val) << (bits))
#else
#define FB_LEFT_POS(bpp) (0)
#define FB_SHIFT_HIGH(val, bits) ((val) << (bits))
#define FB_SHIFT_LOW(val, bits) ((val) >> (bits))
#endif
#define FB_LEFT_POS(p, bpp) (fb_be_math(p) ? (32 - (bpp)) : 0)
#define FB_SHIFT_HIGH(p, val, bits) (fb_be_math(p) ? (val) >> (bits) : \
(val) << (bits))
#define FB_SHIFT_LOW(p, val, bits) (fb_be_math(p) ? (val) << (bits) : \
(val) >> (bits))
/*
* `Generic' versions of the frame buffer device operations
@@ -970,6 +977,25 @@ extern void fb_deferred_io_cleanup(struct fb_info *info);
extern int fb_deferred_io_fsync(struct file *file, struct dentry *dentry,
int datasync);
static inline bool fb_be_math(struct fb_info *info)
{
#ifdef CONFIG_FB_FOREIGN_ENDIAN
#if defined(CONFIG_FB_BOTH_ENDIAN)
return info->flags & FBINFO_BE_MATH;
#elif defined(CONFIG_FB_BIG_ENDIAN)
return true;
#elif defined(CONFIG_FB_LITTLE_ENDIAN)
return false;
#endif /* CONFIG_FB_BOTH_ENDIAN */
#else
#ifdef __BIG_ENDIAN
return true;
#else
return false;
#endif /* __BIG_ENDIAN */
#endif /* CONFIG_FB_FOREIGN_ENDIAN */
}
/* drivers/video/fbsysfs.c */
extern struct fb_info *framebuffer_alloc(size_t size, struct device *dev);
extern void framebuffer_release(struct fb_info *info);