drivers/firmware/google/coreboot_table.h

   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 */
  26 struct 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 */
  37 struct coreboot_table_entry {
  38         u32 tag;
  39         u32 size;
  40 };
  41
  42 /* Points to a CBMEM entry */
  43 struct lb_cbmem_ref {
  44         u32 tag;
  45         u32 size;
  46
  47         u64 cbmem_addr;
  48 };
  49
  50 /* Describes framebuffer setup by coreboot */
  51 struct 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. */
  71 struct 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. */
  81 struct 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. */
  89 int coreboot_driver_register(struct coreboot_driver *driver);
  90
  91 /* Unregister a driver that uses the data from a coreboot table. */
  92 void coreboot_driver_unregister(struct coreboot_driver *driver);
  93
  94 /* Initialize coreboot table module given a pointer to iomem */
  95 int coreboot_table_init(struct device *dev, void __iomem *ptr);
  96
  97 /* Cleanup coreboot table module */
  98 int coreboot_table_exit(void);
  99
 100 #endif /* __COREBOOT_TABLE_H */