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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
parent 5ae90d8e46
commit 5ef76da644
3 changed files with 93 additions and 16 deletions
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5
drivers/video/Kconfig
View File

@ -2457,7 +2457,7 @@ config FB_HYPERV
config FB_SIMPLE
bool "Simple framebuffer support"
depends on (FB = y) && OF
depends on (FB = y)
select FB_CFB_FILLRECT
select FB_CFB_COPYAREA
select FB_CFB_IMAGEBLIT
@ -2469,8 +2469,7 @@ config FB_SIMPLE
pre-allocated frame buffer surface.
Configuration re: surface address, size, and format must be provided
through device tree, or potentially plain old platform data in the
future.
through device tree, or plain old platform data.
source "drivers/video/omap/Kconfig"
source "drivers/video/omap2/Kconfig"

48
drivers/video/simplefb.c
View File

@ -24,6 +24,7 @@
#include <linux/fb.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_data/simplefb.h>
#include <linux/platform_device.h>
static struct fb_fix_screeninfo simplefb_fix = {
@ -73,18 +74,7 @@ static struct fb_ops simplefb_ops = {
.fb_imageblit = cfb_imageblit,
};
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;
};
static struct simplefb_format simplefb_formats[] = {
{ "r5g6b5", 16, {11, 5}, {5, 6}, {0, 5}, {0, 0} },
};
static struct simplefb_format simplefb_formats[] = SIMPLEFB_FORMATS;
struct simplefb_params {
u32 width;
@ -139,6 +129,33 @@ static int simplefb_parse_dt(struct platform_device *pdev,
return 0;
}
static int simplefb_parse_pd(struct platform_device *pdev,
struct simplefb_params *params)
{
struct simplefb_platform_data *pd = pdev->dev.platform_data;
int i;
params->width = pd->width;
params->height = pd->height;
params->stride = pd->stride;
params->format = NULL;
for (i = 0; i < ARRAY_SIZE(simplefb_formats); i++) {
if (strcmp(pd->format, simplefb_formats[i].name))
continue;
params->format = &simplefb_formats[i];
break;
}
if (!params->format) {
dev_err(&pdev->dev, "Invalid format value\n");
return -EINVAL;
}
return 0;
}
static int simplefb_probe(struct platform_device *pdev)
{
int ret;
@ -149,7 +166,12 @@ static int simplefb_probe(struct platform_device *pdev)
if (fb_get_options("simplefb", NULL))
return -ENODEV;
ret = simplefb_parse_dt(pdev, &params);
ret = -ENODEV;
if (pdev->dev.platform_data)
ret = simplefb_parse_pd(pdev, &params);
else if (pdev->dev.of_node)
ret = simplefb_parse_dt(pdev, &params);
if (ret)
return ret;

56
include/linux/platform_data/simplefb.h Normal file
View File

@ -0,0 +1,56 @@
/*
* 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__ */