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fbdev: simplefb: add init through platform_data

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If we create proper platform-devices in x86 boot-code, we can use simplefb
for VBE or EFI framebuffers, too. However, there is normally no OF support
so we introduce a platform_data object so x86 boot-code can pass the
parameters via plain old platform-data.

This also removes the OF dependency as it is not needed. The headers
provide proper dummies for the case OF is disabled.

Furthermore, we move the FORMAT-definitions to the common platform header
so initialization code can use it to transform "struct screen_info" to
the right format-name.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Link: http://lkml.kernel.org/r/1375445127-15480-2-git-send-email-dh.herrmann@gmail.com
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
David Herrmann 2013-08-02 14:05:20 +02:00 • committed by H. Peter Anvin
commit 5ef76da644
3 changed files with 93 additions and 16 deletions
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56
include/linux/platform_data/simplefb.h Normal file
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/*
* simplefb.h - Simple Framebuffer Device
*
* Copyright (C) 2013 David Herrmann <dh.herrmann@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef __PLATFORM_DATA_SIMPLEFB_H__
#define __PLATFORM_DATA_SIMPLEFB_H__
#include <drm/drm_fourcc.h>
#include <linux/fb.h>
#include <linux/kernel.h>
/* format array, use it to initialize a "struct simplefb_format" array */
#define SIMPLEFB_FORMATS \
{ \
{ "r5g6b5", 16, {11, 5}, {5, 6}, {0, 5}, {0, 0}, DRM_FORMAT_RGB565 }, \
}
/*
* Data-Format for Simple-Framebuffers
* @name: unique 0-terminated name that can be used to identify the mode
* @red,green,blue: Offsets and sizes of the single RGB parts
* @transp: Offset and size of the alpha bits. length=0 means no alpha
* @fourcc: 32bit DRM four-CC code (see drm_fourcc.h)
*/
struct simplefb_format {
const char *name;
u32 bits_per_pixel;
struct fb_bitfield red;
struct fb_bitfield green;
struct fb_bitfield blue;
struct fb_bitfield transp;
u32 fourcc;
};
/*
* Simple-Framebuffer description
* If the arch-boot code creates simple-framebuffers without DT support, it
* can pass the width, height, stride and format via this platform-data object.
* The framebuffer location must be given as IORESOURCE_MEM resource.
* @format must be a format as described in "struct simplefb_format" above.
*/
struct simplefb_platform_data {
u32 width;
u32 height;
u32 stride;
const char *format;
};
#endif /* __PLATFORM_DATA_SIMPLEFB_H__ */