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8a0a62941a
Switch the plain 'tag' field in struct coreboot_driver for the newly created coreboot_device_id struct, which also contains a tag field and has the benefit of allowing modalias generation, and update all coreboot drivers accordingly. While at it, also add the id table for each driver to the module device table to allow automatically loading the module. Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Reviewed-by: Brian Norris <briannorris@chromium.org> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com> Link: https://lore.kernel.org/r/20240212-coreboot-mod-defconfig-v4-3-d14172676f6d@collabora.com Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* coreboot_table.h
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*
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* Internal header for coreboot table access.
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*
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* Copyright 2014 Gerd Hoffmann <kraxel@redhat.com>
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* Copyright 2017 Google Inc.
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* Copyright 2017 Samuel Holland <samuel@sholland.org>
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*/
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#ifndef __COREBOOT_TABLE_H
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#define __COREBOOT_TABLE_H
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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/* Coreboot table header structure */
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struct coreboot_table_header {
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char signature[4];
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u32 header_bytes;
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u32 header_checksum;
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u32 table_bytes;
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u32 table_checksum;
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u32 table_entries;
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};
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/* List of coreboot entry structures that is used */
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/* Generic */
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struct coreboot_table_entry {
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u32 tag;
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u32 size;
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};
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/* Points to a CBMEM entry */
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struct lb_cbmem_ref {
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u32 tag;
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u32 size;
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u64 cbmem_addr;
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};
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#define LB_TAG_CBMEM_ENTRY 0x31
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/* Corresponds to LB_TAG_CBMEM_ENTRY */
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struct lb_cbmem_entry {
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u32 tag;
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u32 size;
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u64 address;
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u32 entry_size;
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u32 id;
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};
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/* Describes framebuffer setup by coreboot */
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struct lb_framebuffer {
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u32 tag;
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u32 size;
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u64 physical_address;
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u32 x_resolution;
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u32 y_resolution;
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u32 bytes_per_line;
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u8 bits_per_pixel;
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u8 red_mask_pos;
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u8 red_mask_size;
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u8 green_mask_pos;
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u8 green_mask_size;
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u8 blue_mask_pos;
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u8 blue_mask_size;
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u8 reserved_mask_pos;
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u8 reserved_mask_size;
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};
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/* A device, additionally with information from coreboot. */
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struct coreboot_device {
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struct device dev;
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union {
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struct coreboot_table_entry entry;
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struct lb_cbmem_ref cbmem_ref;
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struct lb_cbmem_entry cbmem_entry;
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struct lb_framebuffer framebuffer;
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DECLARE_FLEX_ARRAY(u8, raw);
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};
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};
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static inline struct coreboot_device *dev_to_coreboot_device(struct device *dev)
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{
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return container_of(dev, struct coreboot_device, dev);
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}
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/* A driver for handling devices described in coreboot tables. */
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struct coreboot_driver {
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int (*probe)(struct coreboot_device *);
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void (*remove)(struct coreboot_device *);
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struct device_driver drv;
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const struct coreboot_device_id *id_table;
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};
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/* Register a driver that uses the data from a coreboot table. */
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int coreboot_driver_register(struct coreboot_driver *driver);
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/* Unregister a driver that uses the data from a coreboot table. */
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void coreboot_driver_unregister(struct coreboot_driver *driver);
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/* module_coreboot_driver() - Helper macro for drivers that don't do
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* anything special in module init/exit. This eliminates a lot of
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* boilerplate. Each module may only use this macro once, and
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* calling it replaces module_init() and module_exit()
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*/
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#define module_coreboot_driver(__coreboot_driver) \
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module_driver(__coreboot_driver, coreboot_driver_register, \
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coreboot_driver_unregister)
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#endif /* __COREBOOT_TABLE_H */
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