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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 23 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141901.115786599@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* framebuffer-coreboot.c
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*
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* Memory based framebuffer accessed through coreboot table.
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*
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* Copyright 2012-2013 David Herrmann <dh.herrmann@gmail.com>
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* Copyright 2017 Google Inc.
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* Copyright 2017 Samuel Holland <samuel@sholland.org>
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*/
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/platform_data/simplefb.h>
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#include <linux/platform_device.h>
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#include "coreboot_table.h"
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#define CB_TAG_FRAMEBUFFER 0x12
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static const struct simplefb_format formats[] = SIMPLEFB_FORMATS;
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static int framebuffer_probe(struct coreboot_device *dev)
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{
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int i;
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u32 length;
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struct lb_framebuffer *fb = &dev->framebuffer;
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struct platform_device *pdev;
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struct resource res;
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struct simplefb_platform_data pdata = {
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.width = fb->x_resolution,
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.height = fb->y_resolution,
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.stride = fb->bytes_per_line,
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.format = NULL,
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};
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for (i = 0; i < ARRAY_SIZE(formats); ++i) {
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if (fb->bits_per_pixel == formats[i].bits_per_pixel &&
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fb->red_mask_pos == formats[i].red.offset &&
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fb->red_mask_size == formats[i].red.length &&
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fb->green_mask_pos == formats[i].green.offset &&
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fb->green_mask_size == formats[i].green.length &&
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fb->blue_mask_pos == formats[i].blue.offset &&
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fb->blue_mask_size == formats[i].blue.length &&
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fb->reserved_mask_pos == formats[i].transp.offset &&
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fb->reserved_mask_size == formats[i].transp.length)
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pdata.format = formats[i].name;
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}
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if (!pdata.format)
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return -ENODEV;
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memset(&res, 0, sizeof(res));
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res.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
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res.name = "Coreboot Framebuffer";
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res.start = fb->physical_address;
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length = PAGE_ALIGN(fb->y_resolution * fb->bytes_per_line);
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res.end = res.start + length - 1;
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if (res.end <= res.start)
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return -EINVAL;
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pdev = platform_device_register_resndata(&dev->dev,
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"simple-framebuffer", 0,
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&res, 1, &pdata,
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sizeof(pdata));
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if (IS_ERR(pdev))
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pr_warn("coreboot: could not register framebuffer\n");
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else
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dev_set_drvdata(&dev->dev, pdev);
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return PTR_ERR_OR_ZERO(pdev);
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}
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static int framebuffer_remove(struct coreboot_device *dev)
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{
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struct platform_device *pdev = dev_get_drvdata(&dev->dev);
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platform_device_unregister(pdev);
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return 0;
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}
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static struct coreboot_driver framebuffer_driver = {
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.probe = framebuffer_probe,
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.remove = framebuffer_remove,
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.drv = {
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.name = "framebuffer",
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},
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.tag = CB_TAG_FRAMEBUFFER,
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};
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static int __init coreboot_framebuffer_init(void)
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{
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return coreboot_driver_register(&framebuffer_driver);
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}
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static void coreboot_framebuffer_exit(void)
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{
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coreboot_driver_unregister(&framebuffer_driver);
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}
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module_init(coreboot_framebuffer_init);
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module_exit(coreboot_framebuffer_exit);
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MODULE_AUTHOR("Samuel Holland <samuel@sholland.org>");
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MODULE_LICENSE("GPL");
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