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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_node_data - icc node data
19 *
20 * @node: icc node
21 * @tag: tag
22 */
23struct icc_node_data {
24 struct icc_node *node;
25 u32 tag;
26};
27
28/**
29 * struct icc_onecell_data - driver data for onecell interconnect providers
30 *
31 * @num_nodes: number of nodes in this device
32 * @nodes: array of pointers to the nodes in this device
33 */
34struct icc_onecell_data {
35 unsigned int num_nodes;
36 struct icc_node *nodes[] __counted_by(num_nodes);
37};
38
39struct icc_node *of_icc_xlate_onecell(const struct of_phandle_args *spec,
40 void *data);
41
42/**
43 * struct icc_provider - interconnect provider (controller) entity that might
44 * provide multiple interconnect controls
45 *
46 * @provider_list: list of the registered interconnect providers
47 * @nodes: internal list of the interconnect provider nodes
48 * @set: pointer to device specific set operation function
49 * @aggregate: pointer to device specific aggregate operation function
50 * @pre_aggregate: pointer to device specific function that is called
51 * before the aggregation begins (optional)
52 * @get_bw: pointer to device specific function to get current bandwidth
53 * @xlate: provider-specific callback for mapping nodes from phandle arguments
54 * @xlate_extended: vendor-specific callback for mapping node data from phandle arguments
55 * @dev: the device this interconnect provider belongs to
56 * @users: count of active users
57 * @inter_set: whether inter-provider pairs will be configured with @set
58 * @data: pointer to private data
59 */
60struct icc_provider {
61 struct list_head provider_list;
62 struct list_head nodes;
63 int (*set)(struct icc_node *src, struct icc_node *dst);
64 int (*aggregate)(struct icc_node *node, u32 tag, u32 avg_bw,
65 u32 peak_bw, u32 *agg_avg, u32 *agg_peak);
66 void (*pre_aggregate)(struct icc_node *node);
67 int (*get_bw)(struct icc_node *node, u32 *avg, u32 *peak);
68 struct icc_node* (*xlate)(const struct of_phandle_args *spec, void *data);
69 struct icc_node_data* (*xlate_extended)(const struct of_phandle_args *spec,
70 void *data);
71 struct device *dev;
72 int users;
73 bool inter_set;
74 void *data;
75};
76
77/**
78 * struct icc_node - entity that is part of the interconnect topology
79 *
80 * @id: platform specific node id
81 * @name: node name used in debugfs
82 * @links: a list of targets pointing to where we can go next when traversing
83 * @num_links: number of links to other interconnect nodes
84 * @provider: points to the interconnect provider of this node
85 * @node_list: the list entry in the parent provider's "nodes" list
86 * @search_list: list used when walking the nodes graph
87 * @reverse: pointer to previous node when walking the nodes graph
88 * @is_traversed: flag that is used when walking the nodes graph
89 * @req_list: a list of QoS constraint requests associated with this node
90 * @avg_bw: aggregated value of average bandwidth requests from all consumers
91 * @peak_bw: aggregated value of peak bandwidth requests from all consumers
92 * @init_avg: average bandwidth value that is read from the hardware during init
93 * @init_peak: peak bandwidth value that is read from the hardware during init
94 * @data: pointer to private data
95 */
96struct icc_node {
97 int id;
98 const char *name;
99 struct icc_node **links;
100 size_t num_links;
101
102 struct icc_provider *provider;
103 struct list_head node_list;
104 struct list_head search_list;
105 struct icc_node *reverse;
106 u8 is_traversed:1;
107 struct hlist_head req_list;
108 u32 avg_bw;
109 u32 peak_bw;
110 u32 init_avg;
111 u32 init_peak;
112 void *data;
113};
114
115#if IS_ENABLED(CONFIG_INTERCONNECT)
116
117int icc_std_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
118 u32 peak_bw, u32 *agg_avg, u32 *agg_peak);
119struct icc_node *icc_node_create_dyn(void);
120struct icc_node *icc_node_create(int id);
121void icc_node_destroy(int id);
122int icc_node_set_name(struct icc_node *node, const struct icc_provider *provider, const char *name);
123int icc_link_nodes(struct icc_node *src_node, struct icc_node **dst_node);
124int icc_link_create(struct icc_node *node, const int dst_id);
125void icc_node_add(struct icc_node *node, struct icc_provider *provider);
126void icc_node_del(struct icc_node *node);
127int icc_nodes_remove(struct icc_provider *provider);
128void icc_provider_init(struct icc_provider *provider);
129int icc_provider_register(struct icc_provider *provider);
130void icc_provider_deregister(struct icc_provider *provider);
131struct icc_node_data *of_icc_get_from_provider(const struct of_phandle_args *spec);
132void icc_sync_state(struct device *dev);
133
134#else
135
136static inline int icc_std_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
137 u32 peak_bw, u32 *agg_avg, u32 *agg_peak)
138{
139 return -ENOTSUPP;
140}
141
142static inline struct icc_node *icc_node_create_dyn(void)
143{
144 return ERR_PTR(-EOPNOTSUPP);
145}
146
147static inline struct icc_node *icc_node_create(int id)
148{
149 return ERR_PTR(-ENOTSUPP);
150}
151
152static inline void icc_node_destroy(int id)
153{
154}
155
156static inline int icc_node_set_name(struct icc_node *node, const struct icc_provider *provider,
157 const char *name)
158{
159 return -EOPNOTSUPP;
160}
161
162static inline int icc_link_nodes(struct icc_node *src_node, struct icc_node **dst_node)
163{
164 return -EOPNOTSUPP;
165}
166
167static inline int icc_link_create(struct icc_node *node, const int dst_id)
168{
169 return -ENOTSUPP;
170}
171
172static inline void icc_node_add(struct icc_node *node, struct icc_provider *provider)
173{
174}
175
176static inline void icc_node_del(struct icc_node *node)
177{
178}
179
180static inline int icc_nodes_remove(struct icc_provider *provider)
181{
182 return -ENOTSUPP;
183}
184
185static inline void icc_provider_init(struct icc_provider *provider) { }
186
187static inline int icc_provider_register(struct icc_provider *provider)
188{
189 return -ENOTSUPP;
190}
191
192static inline void icc_provider_deregister(struct icc_provider *provider) { }
193
194static inline struct icc_node_data *of_icc_get_from_provider(const struct of_phandle_args *spec)
195{
196 return ERR_PTR(-ENOTSUPP);
197}
198
199#endif /* CONFIG_INTERCONNECT */
200
201#endif /* __LINUX_INTERCONNECT_PROVIDER_H */