1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (c) 2023, Linaro Ltd.
7 #include <linux/device.h>
8 #include <linux/interconnect-clk.h>
9 #include <linux/interconnect-provider.h>
16 struct icc_clk_provider {
17 struct icc_provider provider;
19 struct icc_clk_node clocks[] __counted_by(num_clocks);
22 #define to_icc_clk_provider(_provider) \
23 container_of(_provider, struct icc_clk_provider, provider)
25 static int icc_clk_set(struct icc_node *src, struct icc_node *dst)
27 struct icc_clk_node *qn = src->data;
35 clk_disable_unprepare(qn->clk);
42 ret = clk_prepare_enable(qn->clk);
48 return clk_set_rate(qn->clk, icc_units_to_bps(src->peak_bw));
51 static int icc_clk_get_bw(struct icc_node *node, u32 *avg, u32 *peak)
53 struct icc_clk_node *qn = node->data;
58 *peak = Bps_to_icc(clk_get_rate(qn->clk));
64 * icc_clk_register() - register a new clk-based interconnect provider
65 * @dev: device supporting this provider
66 * @first_id: an ID of the first provider's node
67 * @num_clocks: number of instances of struct icc_clk_data
68 * @data: data for the provider
70 * Registers and returns a clk-based interconnect provider. It is a simple
71 * wrapper around COMMON_CLK framework, allowing other devices to vote on the
74 * Return: 0 on success, or an error code otherwise
76 struct icc_provider *icc_clk_register(struct device *dev,
77 unsigned int first_id,
78 unsigned int num_clocks,
79 const struct icc_clk_data *data)
81 struct icc_clk_provider *qp;
82 struct icc_provider *provider;
83 struct icc_onecell_data *onecell;
84 struct icc_node *node;
87 onecell = devm_kzalloc(dev, struct_size(onecell, nodes, 2 * num_clocks), GFP_KERNEL);
89 return ERR_PTR(-ENOMEM);
90 onecell->num_nodes = 2 * num_clocks;
92 qp = devm_kzalloc(dev, struct_size(qp, clocks, num_clocks), GFP_KERNEL);
94 return ERR_PTR(-ENOMEM);
96 qp->num_clocks = num_clocks;
98 provider = &qp->provider;
100 provider->get_bw = icc_clk_get_bw;
101 provider->set = icc_clk_set;
102 provider->aggregate = icc_std_aggregate;
103 provider->xlate = of_icc_xlate_onecell;
104 INIT_LIST_HEAD(&provider->nodes);
105 provider->data = onecell;
107 icc_provider_init(provider);
109 for (i = 0, j = 0; i < num_clocks; i++) {
110 qp->clocks[i].clk = data[i].clk;
112 node = icc_node_create(first_id + data[i].master_id);
118 node->name = devm_kasprintf(dev, GFP_KERNEL, "%s_master", data[i].name);
119 node->data = &qp->clocks[i];
120 icc_node_add(node, provider);
121 /* link to the next node, slave */
122 icc_link_create(node, first_id + data[i].slave_id);
123 onecell->nodes[j++] = node;
125 node = icc_node_create(first_id + data[i].slave_id);
131 node->name = devm_kasprintf(dev, GFP_KERNEL, "%s_slave", data[i].name);
132 /* no data for slave node */
133 icc_node_add(node, provider);
134 onecell->nodes[j++] = node;
137 ret = icc_provider_register(provider);
144 icc_nodes_remove(provider);
148 EXPORT_SYMBOL_GPL(icc_clk_register);
150 static void devm_icc_release(void *res)
152 icc_clk_unregister(res);
155 int devm_icc_clk_register(struct device *dev, unsigned int first_id,
156 unsigned int num_clocks, const struct icc_clk_data *data)
158 struct icc_provider *prov;
160 prov = icc_clk_register(dev, first_id, num_clocks, data);
162 return PTR_ERR(prov);
164 return devm_add_action_or_reset(dev, devm_icc_release, prov);
166 EXPORT_SYMBOL_GPL(devm_icc_clk_register);
169 * icc_clk_unregister() - unregister a previously registered clk interconnect provider
170 * @provider: provider returned by icc_clk_register()
172 void icc_clk_unregister(struct icc_provider *provider)
174 struct icc_clk_provider *qp = container_of(provider, struct icc_clk_provider, provider);
177 icc_provider_deregister(&qp->provider);
178 icc_nodes_remove(&qp->provider);
180 for (i = 0; i < qp->num_clocks; i++) {
181 struct icc_clk_node *qn = &qp->clocks[i];
184 clk_disable_unprepare(qn->clk);
187 EXPORT_SYMBOL_GPL(icc_clk_unregister);
189 MODULE_LICENSE("GPL");
190 MODULE_DESCRIPTION("Interconnect wrapper for clocks");
191 MODULE_AUTHOR("Dmitry Baryshkov <dmitry.baryshkov@linaro.org>");