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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (c) 2018, Linaro Ltd.
4 * Author: Georgi Djakov <georgi.djakov@linaro.org>
5 */
6
7#ifndef __LINUX_INTERCONNECT_PROVIDER_H
8#define __LINUX_INTERCONNECT_PROVIDER_H
9
10#include <linux/interconnect.h>
11
12#define icc_units_to_bps(bw) ((bw) * 1000ULL)
13
14struct icc_node;
15struct of_phandle_args;
16
17/**
18 * struct icc_onecell_data - driver data for onecell interconnect providers
19 *
20 * @num_nodes: number of nodes in this device
21 * @nodes: array of pointers to the nodes in this device
22 */
23struct icc_onecell_data {
24 unsigned int num_nodes;
25 struct icc_node *nodes[];
26};
27
28struct icc_node *of_icc_xlate_onecell(struct of_phandle_args *spec,
29 void *data);
30
31/**
32 * struct icc_provider - interconnect provider (controller) entity that might
33 * provide multiple interconnect controls
34 *
35 * @provider_list: list of the registered interconnect providers
36 * @nodes: internal list of the interconnect provider nodes
37 * @set: pointer to device specific set operation function
38 * @aggregate: pointer to device specific aggregate operation function
39 * @pre_aggregate: pointer to device specific function that is called
40 * before the aggregation begins (optional)
41 * @xlate: provider-specific callback for mapping nodes from phandle arguments
42 * @dev: the device this interconnect provider belongs to
43 * @users: count of active users
44 * @data: pointer to private data
45 */
46struct icc_provider {
47 struct list_head provider_list;
48 struct list_head nodes;
49 int (*set)(struct icc_node *src, struct icc_node *dst);
50 int (*aggregate)(struct icc_node *node, u32 tag, u32 avg_bw,
51 u32 peak_bw, u32 *agg_avg, u32 *agg_peak);
52 void (*pre_aggregate)(struct icc_node *node);
53 struct icc_node* (*xlate)(struct of_phandle_args *spec, void *data);
54 struct device *dev;
55 int users;
56 void *data;
57};
58
59/**
60 * struct icc_node - entity that is part of the interconnect topology
61 *
62 * @id: platform specific node id
63 * @name: node name used in debugfs
64 * @links: a list of targets pointing to where we can go next when traversing
65 * @num_links: number of links to other interconnect nodes
66 * @provider: points to the interconnect provider of this node
67 * @node_list: the list entry in the parent provider's "nodes" list
68 * @search_list: list used when walking the nodes graph
69 * @reverse: pointer to previous node when walking the nodes graph
70 * @is_traversed: flag that is used when walking the nodes graph
71 * @req_list: a list of QoS constraint requests associated with this node
72 * @avg_bw: aggregated value of average bandwidth requests from all consumers
73 * @peak_bw: aggregated value of peak bandwidth requests from all consumers
74 * @data: pointer to private data
75 */
76struct icc_node {
77 int id;
78 const char *name;
79 struct icc_node **links;
80 size_t num_links;
81
82 struct icc_provider *provider;
83 struct list_head node_list;
84 struct list_head search_list;
85 struct icc_node *reverse;
86 u8 is_traversed:1;
87 struct hlist_head req_list;
88 u32 avg_bw;
89 u32 peak_bw;
90 void *data;
91};
92
93#if IS_ENABLED(CONFIG_INTERCONNECT)
94
95int icc_std_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
96 u32 peak_bw, u32 *agg_avg, u32 *agg_peak);
97struct icc_node *icc_node_create(int id);
98void icc_node_destroy(int id);
99int icc_link_create(struct icc_node *node, const int dst_id);
100int icc_link_destroy(struct icc_node *src, struct icc_node *dst);
101void icc_node_add(struct icc_node *node, struct icc_provider *provider);
102void icc_node_del(struct icc_node *node);
103int icc_nodes_remove(struct icc_provider *provider);
104int icc_provider_add(struct icc_provider *provider);
105int icc_provider_del(struct icc_provider *provider);
106
107#else
108
109static inline int icc_std_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
110 u32 peak_bw, u32 *agg_avg, u32 *agg_peak)
111{
112 return -ENOTSUPP;
113}
114
115static inline struct icc_node *icc_node_create(int id)
116{
117 return ERR_PTR(-ENOTSUPP);
118}
119
120void icc_node_destroy(int id)
121{
122}
123
124static inline int icc_link_create(struct icc_node *node, const int dst_id)
125{
126 return -ENOTSUPP;
127}
128
129int icc_link_destroy(struct icc_node *src, struct icc_node *dst)
130{
131 return -ENOTSUPP;
132}
133
134void icc_node_add(struct icc_node *node, struct icc_provider *provider)
135{
136}
137
138void icc_node_del(struct icc_node *node)
139{
140}
141
142static inline int icc_nodes_remove(struct icc_provider *provider)
143{
144 return -ENOTSUPP;
145}
146
147static inline int icc_provider_add(struct icc_provider *provider)
148{
149 return -ENOTSUPP;
150}
151
152static inline int icc_provider_del(struct icc_provider *provider)
153{
154 return -ENOTSUPP;
155}
156
157#endif /* CONFIG_INTERCONNECT */
158
159#endif /* __LINUX_INTERCONNECT_PROVIDER_H */