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 */ 101