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 <dh.herrmann@gmail.com>
15 #include <linux/device-id/coreboot.h>
54 		return ERR_PTR(-ENODEV);  in framebuffer_parent_pci_dev()
74 		return &pdev->dev;  in framebuffer_parent_dev()
81 	struct lb_framebuffer *fb = &dev->framebuffer;  in framebuffer_probe()
88 		.width = fb->x_resolution,  in framebuffer_probe()
89 		.height = fb->y_resolution,  in framebuffer_probe()
90 		.stride = fb->bytes_per_line,  in framebuffer_probe()
100 	 * not pass a framebuffer information to the Linux kernel.  in framebuffer_probe()
105 	 * that can scan-out using the system provided framebuffer.  in framebuffer_probe()
108 		return -ENODEV;  in framebuffer_probe()
110 	if (!fb->physical_address)  in framebuffer_probe()
111 		return -ENODEV;  in framebuffer_probe()
113 	res = DEFINE_RES_MEM(fb->physical_address,  in framebuffer_probe()
114 			     PAGE_ALIGN(fb->y_resolution * fb->bytes_per_line));  in framebuffer_probe()
116 		return -EINVAL;  in framebuffer_probe()
123 	pdev = platform_device_register_resndata(parent, "coreboot-framebuffer", 0,  in framebuffer_probe()
124 						 &res, 1, fb, fb->size);  in framebuffer_probe()
126 		pr_warn("coreboot: could not register framebuffer\n");  in framebuffer_probe()
133 	 *        coreboot-framebuffer devices. Remove support for  in framebuffer_probe()
134 	 *        simple-framebuffer at some point.  in framebuffer_probe()
137 		if (fb->bits_per_pixel     == formats[i].bits_per_pixel &&  in framebuffer_probe()
138 		    fb->red_mask_pos       == formats[i].red.offset &&  in framebuffer_probe()
139 		    fb->red_mask_size      == formats[i].red.length &&  in framebuffer_probe()
140 		    fb->green_mask_pos     == formats[i].green.offset &&  in framebuffer_probe()
141 		    fb->green_mask_size    == formats[i].green.length &&  in framebuffer_probe()
142 		    fb->blue_mask_pos      == formats[i].blue.offset &&  in framebuffer_probe()
143 		    fb->blue_mask_size     == formats[i].blue.length)  in framebuffer_probe()
147 		ret = -ENODEV;  in framebuffer_probe()
152 						 "simple-framebuffer", 0,  in framebuffer_probe()
157 		pr_warn("coreboot: could not register framebuffer\n");  in framebuffer_probe()
179 		.name = "framebuffer",
186 MODULE_DESCRIPTION("Memory based framebuffer accessed through coreboot table");