1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2020, The Linux Foundation. All rights reserved.
6 #include <linux/interconnect.h>
7 #include <linux/interconnect-provider.h>
8 #include <linux/module.h>
10 #include <linux/of_device.h>
11 #include <linux/slab.h>
13 #include "bcm-voter.h"
14 #include "icc-common.h"
18 * qcom_icc_pre_aggregate - cleans up stale values from prior icc_set
19 * @node: icc node to operate on
21 void qcom_icc_pre_aggregate(struct icc_node *node)
24 struct qcom_icc_node *qn;
25 struct qcom_icc_provider *qp;
28 qp = to_qcom_provider(node->provider);
30 for (i = 0; i < QCOM_ICC_NUM_BUCKETS; i++) {
35 for (i = 0; i < qn->num_bcms; i++)
36 qcom_icc_bcm_voter_add(qp->voter, qn->bcms[i]);
38 EXPORT_SYMBOL_GPL(qcom_icc_pre_aggregate);
41 * qcom_icc_aggregate - aggregate bw for buckets indicated by tag
42 * @node: node to aggregate
43 * @tag: tag to indicate which buckets to aggregate
44 * @avg_bw: new bw to sum aggregate
45 * @peak_bw: new bw to max aggregate
46 * @agg_avg: existing aggregate avg bw val
47 * @agg_peak: existing aggregate peak bw val
49 int qcom_icc_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
50 u32 peak_bw, u32 *agg_avg, u32 *agg_peak)
53 struct qcom_icc_node *qn;
58 tag = QCOM_ICC_TAG_ALWAYS;
60 for (i = 0; i < QCOM_ICC_NUM_BUCKETS; i++) {
62 qn->sum_avg[i] += avg_bw;
63 qn->max_peak[i] = max_t(u32, qn->max_peak[i], peak_bw);
66 if (node->init_avg || node->init_peak) {
67 qn->sum_avg[i] = max_t(u64, qn->sum_avg[i], node->init_avg);
68 qn->max_peak[i] = max_t(u64, qn->max_peak[i], node->init_peak);
73 *agg_peak = max_t(u32, *agg_peak, peak_bw);
77 EXPORT_SYMBOL_GPL(qcom_icc_aggregate);
80 * qcom_icc_set - set the constraints based on path
81 * @src: source node for the path to set constraints on
82 * @dst: destination node for the path to set constraints on
84 * Return: 0 on success, or an error code otherwise
86 int qcom_icc_set(struct icc_node *src, struct icc_node *dst)
88 struct qcom_icc_provider *qp;
89 struct icc_node *node;
96 qp = to_qcom_provider(node->provider);
98 qcom_icc_bcm_voter_commit(qp->voter);
102 EXPORT_SYMBOL_GPL(qcom_icc_set);
105 * qcom_icc_bcm_init - populates bcm aux data and connect qnodes
106 * @bcm: bcm to be initialized
107 * @dev: associated provider device
109 * Return: 0 on success, or an error code otherwise
111 int qcom_icc_bcm_init(struct qcom_icc_bcm *bcm, struct device *dev)
113 struct qcom_icc_node *qn;
114 const struct bcm_db *data;
118 /* BCM is already initialised*/
122 bcm->addr = cmd_db_read_addr(bcm->name);
124 dev_err(dev, "%s could not find RPMh address\n",
129 data = cmd_db_read_aux_data(bcm->name, &data_count);
131 dev_err(dev, "%s command db read error (%ld)\n",
132 bcm->name, PTR_ERR(data));
133 return PTR_ERR(data);
136 dev_err(dev, "%s command db missing or partial aux data\n",
141 bcm->aux_data.unit = le32_to_cpu(data->unit);
142 bcm->aux_data.width = le16_to_cpu(data->width);
143 bcm->aux_data.vcd = data->vcd;
144 bcm->aux_data.reserved = data->reserved;
145 INIT_LIST_HEAD(&bcm->list);
146 INIT_LIST_HEAD(&bcm->ws_list);
148 if (!bcm->vote_scale)
149 bcm->vote_scale = 1000;
151 /* Link Qnodes to their respective BCMs */
152 for (i = 0; i < bcm->num_nodes; i++) {
154 qn->bcms[qn->num_bcms] = bcm;
160 EXPORT_SYMBOL_GPL(qcom_icc_bcm_init);
162 int qcom_icc_rpmh_probe(struct platform_device *pdev)
164 const struct qcom_icc_desc *desc;
165 struct device *dev = &pdev->dev;
166 struct icc_onecell_data *data;
167 struct icc_provider *provider;
168 struct qcom_icc_node * const *qnodes, *qn;
169 struct qcom_icc_provider *qp;
170 struct icc_node *node;
171 size_t num_nodes, i, j;
174 desc = of_device_get_match_data(dev);
178 qnodes = desc->nodes;
179 num_nodes = desc->num_nodes;
181 qp = devm_kzalloc(dev, sizeof(*qp), GFP_KERNEL);
185 data = devm_kzalloc(dev, struct_size(data, nodes, num_nodes), GFP_KERNEL);
189 provider = &qp->provider;
191 provider->set = qcom_icc_set;
192 provider->pre_aggregate = qcom_icc_pre_aggregate;
193 provider->aggregate = qcom_icc_aggregate;
194 provider->xlate_extended = qcom_icc_xlate_extended;
195 INIT_LIST_HEAD(&provider->nodes);
196 provider->data = data;
199 qp->bcms = desc->bcms;
200 qp->num_bcms = desc->num_bcms;
202 qp->voter = of_bcm_voter_get(qp->dev, NULL);
203 if (IS_ERR(qp->voter))
204 return PTR_ERR(qp->voter);
206 ret = icc_provider_add(provider);
210 for (i = 0; i < qp->num_bcms; i++)
211 qcom_icc_bcm_init(qp->bcms[i], dev);
213 for (i = 0; i < num_nodes; i++) {
218 node = icc_node_create(qn->id);
224 node->name = qn->name;
226 icc_node_add(node, provider);
228 for (j = 0; j < qn->num_links; j++)
229 icc_link_create(node, qn->links[j]);
231 data->nodes[i] = node;
234 data->num_nodes = num_nodes;
235 platform_set_drvdata(pdev, qp);
237 /* Populate child NoC devices if any */
238 if (of_get_child_count(dev->of_node) > 0)
239 return of_platform_populate(dev->of_node, NULL, NULL, dev);
243 icc_nodes_remove(provider);
244 icc_provider_del(provider);
247 EXPORT_SYMBOL_GPL(qcom_icc_rpmh_probe);
249 int qcom_icc_rpmh_remove(struct platform_device *pdev)
251 struct qcom_icc_provider *qp = platform_get_drvdata(pdev);
253 icc_nodes_remove(&qp->provider);
254 icc_provider_del(&qp->provider);
258 EXPORT_SYMBOL_GPL(qcom_icc_rpmh_remove);
260 MODULE_LICENSE("GPL v2");