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path: root/drivers/firmware/google/framebuffer-coreboot.c
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pre { line-height: 125%; }
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// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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>
 */

#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;
	<
"n">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; res.name = "Coreboot Framebuffer"; res.start = fb->physical_address; length = PAGE_ALIGN(fb->y_resolution * fb->bytes_per_line); res.end = res.start + length - 1; if (res.end <= res.start) return -EINVAL; pdev = platform_device_register_resndata(&dev->dev, "simple-framebuffer", 0, &res, 1, &pdata, sizeof(pdata)); if (IS_ERR(pdev)) pr_warn("coreboot: could not register framebuffer\n"); else dev_set_drvdata(&dev->dev, pdev); return PTR_ERR_OR_ZERO(pdev); } static int framebuffer_remove(struct coreboot_device *dev) { struct platform_device *pdev = dev_get_drvdata(&dev->dev); platform_device_unregister(pdev); return 0; } static struct coreboot_driver framebuffer_driver = { .probe = framebuffer_probe, .remove = framebuffer_remove, .drv = { .name = "framebuffer", }, .tag = CB_TAG_FRAMEBUFFER, }; module_coreboot_driver(framebuffer_driver); MODULE_AUTHOR("Samuel Holland <samuel@sholland.org>"); MODULE_LICENSE("GPL");