1 // SPDX-License-Identifier: GPL-2.0-only
3  * framebuffer-coreboot.c
5  * Memory based framebuffer accessed through coreboot table.
7  * Copyright 2012-2013 David Herrmann <[email protected]>
30 	struct lb_framebuffer *fb = &dev->framebuffer;  in framebuffer_probe()
34 		.width = fb->x_resolution,  in framebuffer_probe()
35 		.height = fb->y_resolution,  in framebuffer_probe()
36 		.stride = fb->bytes_per_line,  in framebuffer_probe()
43 	 * not pass a framebuffer information to the Linux kernel.  in framebuffer_probe()
48 	 * that can scan-out using the system provided framebuffer.  in framebuffer_probe()
51 		return -ENODEV;  in framebuffer_probe()
53 	if (!fb->physical_address)  in framebuffer_probe()
54 		return -ENODEV;  in framebuffer_probe()
57 		if (fb->bits_per_pixel     == formats[i].bits_per_pixel &&  in framebuffer_probe()
58 		    fb->red_mask_pos       == formats[i].red.offset &&  in framebuffer_probe()
59 		    fb->red_mask_size      == formats[i].red.length &&  in framebuffer_probe()
60 		    fb->green_mask_pos     == formats[i].green.offset &&  in framebuffer_probe()
61 		    fb->green_mask_size    == formats[i].green.length &&  in framebuffer_probe()
62 		    fb->blue_mask_pos      == formats[i].blue.offset &&  in framebuffer_probe()
63 		    fb->blue_mask_size     == formats[i].blue.length)  in framebuffer_probe()
67 		return -ENODEV;  in framebuffer_probe()
71 	res.name = "Coreboot Framebuffer";  in framebuffer_probe()
72 	res.start = fb->physical_address;  in framebuffer_probe()
73 	length = PAGE_ALIGN(fb->y_resolution * fb->bytes_per_line);  in framebuffer_probe()
74 	res.end = res.start + length - 1;  in framebuffer_probe()
76 		return -EINVAL;  in framebuffer_probe()
78 	pdev = platform_device_register_resndata(&dev->dev,  in framebuffer_probe()
79 						 "simple-framebuffer", 0,  in framebuffer_probe()
83 		pr_warn("coreboot: could not register framebuffer\n");  in framebuffer_probe()
85 		dev_set_drvdata(&dev->dev, pdev);  in framebuffer_probe()
92 	struct platform_device *pdev = dev_get_drvdata(&dev->dev);  in framebuffer_remove()
107 		.name = "framebuffer",
114 MODULE_DESCRIPTION("Memory based framebuffer accessed through coreboot table");