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1/*
2 * coreboot_table.h
3 *
4 * Internal header for coreboot table access.
5 *
6 * Copyright 2014 Gerd Hoffmann <kraxel@redhat.com>
7 * Copyright 2017 Google Inc.
8 * Copyright 2017 Samuel Holland <samuel@sholland.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License v2.0 as published by
12 * the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 */
19
20#ifndef __COREBOOT_TABLE_H
21#define __COREBOOT_TABLE_H
22
23#include <linux/io.h>
24
25/* Coreboot table header structure */
26struct coreboot_table_header {
27 char signature[4];
28 u32 header_bytes;
29 u32 header_checksum;
30 u32 table_bytes;
31 u32 table_checksum;
32 u32 table_entries;
33};
34
35/* List of coreboot entry structures that is used */
36/* Generic */
37struct coreboot_table_entry {
38 u32 tag;
39 u32 size;
40};
41
42/* Points to a CBMEM entry */
43struct lb_cbmem_ref {
44 u32 tag;
45 u32 size;
46
47 u64 cbmem_addr;
48};
49
50/* Describes framebuffer setup by coreboot */
51struct lb_framebuffer {
52 u32 tag;
53 u32 size;
54
55 u64 physical_address;
56 u32 x_resolution;
57 u32 y_resolution;
58 u32 bytes_per_line;
59 u8 bits_per_pixel;
60 u8 red_mask_pos;
61 u8 red_mask_size;
62 u8 green_mask_pos;
63 u8 green_mask_size;
64 u8 blue_mask_pos;
65 u8 blue_mask_size;
66 u8 reserved_mask_pos;
67 u8 reserved_mask_size;
68};
69
70/* A device, additionally with information from coreboot. */
71struct coreboot_device {
72 struct device dev;
73 union {
74 struct coreboot_table_entry entry;
75 struct lb_cbmem_ref cbmem_ref;
76 struct lb_framebuffer framebuffer;
77 };
78};
79
80/* A driver for handling devices described in coreboot tables. */
81struct coreboot_driver {
82 int (*probe)(struct coreboot_device *);
83 int (*remove)(struct coreboot_device *);
84 struct device_driver drv;
85 u32 tag;
86};
87
88/* Register a driver that uses the data from a coreboot table. */
89int coreboot_driver_register(struct coreboot_driver *driver);
90
91/* Unregister a driver that uses the data from a coreboot table. */
92void coreboot_driver_unregister(struct coreboot_driver *driver);
93
94#endif /* __COREBOOT_TABLE_H */