linux-imx

/*

 * framebuffer-coreboot.c

 *

 * Memory based framebuffer accessed through coreboot table.

 *

 * Copyright 2012-2013 David Herrmann <dh.herrmann@gmail.com>

 * Copyright 2017 Google Inc.

 * Copyright 2017 Samuel Holland <samuel@sholland.org>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License v2.0 as published by

 * the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */

​

#include <linux/device.h>

#include <linux/kernel.h>

#include <linux/mm.h>

#include <linux/module.h>

#include <linux/platform_data/simplefb.h>

#include <linux/platform_device.h>

​

#include "coreboot_table.h"

​

#define CB_TAG_FRAMEBUFFER 0x12

​

static const struct simplefb_format formats[] = SIMPLEFB_FORMATS;

​

static int framebuffer_probe(struct coreboot_device *dev)

{

    int i;

    u32 length;

    struct lb_framebuffer *fb = &dev->framebuffer;

    struct platform_device *pdev;

    struct resource res;

    struct simplefb_platform_data pdata = {

        .width = fb->x_resolution,

        .height = fb->y_resolution,

        .stride = fb->bytes_per_line,

        .format = NULL,

    };

​

    for (i = 0; i < ARRAY_SIZE(formats); ++i) {

        if (fb->bits_per_pixel     == formats[i].bits_per_pixel &&

            fb->red_mask_pos       == formats[i].red.offset &&

            fb->red_mask_size      == formats[i].red.length &&

            fb->green_mask_pos     == formats[i].green.offset &&

            fb->green_mask_size    == formats[i].green.length &&

            fb->blue_mask_pos      == formats[i].blue.offset &&

            fb->blue_mask_size     == formats[i].blue.length &&

            fb->reserved_mask_pos  == formats[i].transp.offset &&

            fb->reserved_mask_size == formats[i].transp.length)

            pdata.format = formats[i].name;

    }

    if (!pdata.format)

        return -ENODEV;

​

    memset(&res, 0, sizeof(res));

    res.flags = IORESOURCE_MEM | IORESOURCE_BUSY;