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dm: add tag support

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With dm-tag feature, any U-Boot subsystem is allowed to associate
arbitrary number of data with a particular udevice. This can been
see as expanding "struct udevice" without modifying the definition.

As a first user, UEFI subsystem makes use of tags to associate
an efi_disk object with a block device.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
AKASHI Takahiro
2022-03-08 20:36:46 +09:00
committed by Heinrich Schuchardt
parent 75a9d75041
commit 6b7a6210fd
5 changed files with 256 additions and 1 deletions
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110
include/dm/tag.h Normal file
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@@ -0,0 +1,110 @@
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (c) 2021 Linaro Limited
* Author: AKASHI Takahiro
*/
#ifndef _DM_TAG_H
#define _DM_TAG_H
#include <linux/list.h>
#include <linux/types.h>
struct udevice;
enum dm_tag_t {
/* EFI_LOADER */
DM_TAG_EFI = 0,
DM_TAG_COUNT,
};
/**
* dmtag_node
*
* @sibling: List of dm-tag nodes
* @dev: Associated udevice
* @tag: Tag type
* @ptr: Pointer as a value
* @val: Value
*/
struct dmtag_node {
struct list_head sibling;
struct udevice *dev;
enum dm_tag_t tag;
union {
void *ptr;
ulong val;
};
};
/**
* dev_tag_set_ptr() - set a tag's value as a pointer
* @dev: Device to operate
* @tag: Tag type
* @ptr: Pointer to set
*
* Set the value, @ptr, as of @tag associated with the device, @dev
*
* Return: 0 on success, -ve on error
*/
int dev_tag_set_ptr(struct udevice *dev, enum dm_tag_t tag, void *ptr);
/**
* dev_tag_set_val() set a tag's value as an integer
* @dev: Device to operate
* @tag: Tag type
* @val: Value to set
*
* Set the value, @val, as of @tag associated with the device, @dev
*
* Return: on success, -ve on error
*/
int dev_tag_set_val(struct udevice *dev, enum dm_tag_t tag, ulong val);
/**
* dev_tag_get_ptr() - get a tag's value as a pointer
* @dev: Device to operate
* @tag: Tag type
* @ptrp: Pointer to tag's value (pointer)
*
* Get a tag's value as a pointer
*
* Return: on success, -ve on error
*/
int dev_tag_get_ptr(struct udevice *dev, enum dm_tag_t tag, void **ptrp);
/**
* dev_tag_get_val() - get a tag's value as an integer
* @dev: Device to operate
* @tag: Tag type
* @valp: Pointer to tag's value (ulong)
*
* Get a tag's value as an integer
*
* Return: 0 on success, -ve on error
*/
int dev_tag_get_val(struct udevice *dev, enum dm_tag_t tag, ulong *valp);
/**
* dev_tag_del() - delete a tag
* @dev: Device to operate
* @tag: Tag type
*
* Delete a tag of @tag associated with the device, @dev
*
* Return: 0 on success, -ve on error
*/
int dev_tag_del(struct udevice *dev, enum dm_tag_t tag);
/**
* dev_tag_del_all() - delete all tags
* @dev: Device to operate
*
* Delete all the tags associated with the device, @dev
*
* Return: 0 on success, -ve on error
*/
int dev_tag_del_all(struct udevice *dev);
#endif /* _DM_TAG_H */