1 // SPDX-License-Identifier: GPL-2.0
3 * Interconnect framework driver for i.MX SoC
5 * Copyright (c) 2019, BayLibre
6 * Copyright (c) 2019-2020, NXP
7 * Author: Alexandre Bailon <abailon@baylibre.com>
8 * Author: Leonard Crestez <leonard.crestez@nxp.com>
11 #include <linux/device.h>
12 #include <linux/interconnect-provider.h>
13 #include <linux/module.h>
15 #include <linux/of_platform.h>
16 #include <linux/platform_device.h>
17 #include <linux/pm_qos.h>
21 /* private icc_node data */
23 const struct imx_icc_node_desc *desc;
24 struct device *qos_dev;
25 struct dev_pm_qos_request qos_req;
28 static int imx_icc_get_bw(struct icc_node *node, u32 *avg, u32 *peak)
36 static int imx_icc_node_set(struct icc_node *node)
38 struct device *dev = node->provider->dev;
39 struct imx_icc_node *node_data = node->data;
42 if (!node_data->qos_dev)
45 freq = (node->avg_bw + node->peak_bw) * node_data->desc->adj->bw_mul;
46 do_div(freq, node_data->desc->adj->bw_div);
47 dev_dbg(dev, "node %s device %s avg_bw %ukBps peak_bw %ukBps min_freq %llukHz\n",
48 node->name, dev_name(node_data->qos_dev),
49 node->avg_bw, node->peak_bw, freq);
52 dev_err(dev, "%s can't request more than S32_MAX freq\n",
57 dev_pm_qos_update_request(&node_data->qos_req, freq);
62 static int imx_icc_set(struct icc_node *src, struct icc_node *dst)
64 return imx_icc_node_set(dst);
67 /* imx_icc_node_destroy() - Destroy an imx icc_node, including private data */
68 static void imx_icc_node_destroy(struct icc_node *node)
70 struct imx_icc_node *node_data = node->data;
73 if (dev_pm_qos_request_active(&node_data->qos_req)) {
74 ret = dev_pm_qos_remove_request(&node_data->qos_req);
76 dev_warn(node->provider->dev,
77 "failed to remove qos request for %s\n",
78 dev_name(node_data->qos_dev));
81 put_device(node_data->qos_dev);
83 icc_node_destroy(node->id);
86 static int imx_icc_node_init_qos(struct icc_provider *provider,
87 struct icc_node *node)
89 struct imx_icc_node *node_data = node->data;
90 const struct imx_icc_node_adj_desc *adj = node_data->desc->adj;
91 struct device *dev = provider->dev;
92 struct device_node *dn = NULL;
93 struct platform_device *pdev;
96 node_data->qos_dev = dev;
97 dev_dbg(dev, "icc node %s[%d] is main noc itself\n",
98 node->name, node->id);
100 dn = of_parse_phandle(dev->of_node, adj->phandle_name, 0);
102 dev_warn(dev, "Failed to parse %s\n",
106 /* Allow scaling to be disabled on a per-node basis */
107 if (!of_device_is_available(dn)) {
108 dev_warn(dev, "Missing property %s, skip scaling %s\n",
109 adj->phandle_name, node->name);
114 pdev = of_find_device_by_node(dn);
117 dev_warn(dev, "node %s[%d] missing device for %pOF\n",
118 node->name, node->id, dn);
119 return -EPROBE_DEFER;
121 node_data->qos_dev = &pdev->dev;
122 dev_dbg(dev, "node %s[%d] has device node %pOF\n",
123 node->name, node->id, dn);
126 return dev_pm_qos_add_request(node_data->qos_dev,
128 DEV_PM_QOS_MIN_FREQUENCY, 0);
131 static struct icc_node *imx_icc_node_add(struct icc_provider *provider,
132 const struct imx_icc_node_desc *node_desc)
134 struct device *dev = provider->dev;
135 struct imx_icc_node *node_data;
136 struct icc_node *node;
139 node = icc_node_create(node_desc->id);
141 dev_err(dev, "failed to create node %d\n", node_desc->id);
146 dev_err(dev, "already created node %s id=%d\n",
147 node_desc->name, node_desc->id);
148 return ERR_PTR(-EEXIST);
151 node_data = devm_kzalloc(dev, sizeof(*node_data), GFP_KERNEL);
153 icc_node_destroy(node->id);
154 return ERR_PTR(-ENOMEM);
157 node->name = node_desc->name;
158 node->data = node_data;
159 node_data->desc = node_desc;
160 icc_node_add(node, provider);
162 if (node_desc->adj) {
163 ret = imx_icc_node_init_qos(provider, node);
165 imx_icc_node_destroy(node);
173 static void imx_icc_unregister_nodes(struct icc_provider *provider)
175 struct icc_node *node, *tmp;
177 list_for_each_entry_safe(node, tmp, &provider->nodes, node_list)
178 imx_icc_node_destroy(node);
181 static int imx_icc_register_nodes(struct icc_provider *provider,
182 const struct imx_icc_node_desc *descs,
185 struct icc_onecell_data *provider_data = provider->data;
189 for (i = 0; i < count; i++) {
190 struct icc_node *node;
191 const struct imx_icc_node_desc *node_desc = &descs[i];
194 node = imx_icc_node_add(provider, node_desc);
196 ret = dev_err_probe(provider->dev, PTR_ERR(node),
197 "failed to add %s\n", node_desc->name);
200 provider_data->nodes[node->id] = node;
202 for (j = 0; j < node_desc->num_links; j++) {
203 ret = icc_link_create(node, node_desc->links[j]);
205 dev_err(provider->dev, "failed to link node %d to %d: %d\n",
206 node->id, node_desc->links[j], ret);
215 imx_icc_unregister_nodes(provider);
220 static int get_max_node_id(struct imx_icc_node_desc *nodes, int nodes_count)
224 for (i = 0; i < nodes_count; ++i)
225 if (nodes[i].id > ret)
231 int imx_icc_register(struct platform_device *pdev,
232 struct imx_icc_node_desc *nodes, int nodes_count)
234 struct device *dev = &pdev->dev;
235 struct icc_onecell_data *data;
236 struct icc_provider *provider;
240 /* icc_onecell_data is indexed by node_id, unlike nodes param */
241 max_node_id = get_max_node_id(nodes, nodes_count);
242 data = devm_kzalloc(dev, struct_size(data, nodes, max_node_id),
246 data->num_nodes = max_node_id;
248 provider = devm_kzalloc(dev, sizeof(*provider), GFP_KERNEL);
251 provider->set = imx_icc_set;
252 provider->get_bw = imx_icc_get_bw;
253 provider->aggregate = icc_std_aggregate;
254 provider->xlate = of_icc_xlate_onecell;
255 provider->data = data;
256 provider->dev = dev->parent;
257 platform_set_drvdata(pdev, provider);
259 ret = icc_provider_add(provider);
261 dev_err(dev, "error adding interconnect provider: %d\n", ret);
265 ret = imx_icc_register_nodes(provider, nodes, nodes_count);
272 icc_provider_del(provider);
275 EXPORT_SYMBOL_GPL(imx_icc_register);
277 int imx_icc_unregister(struct platform_device *pdev)
279 struct icc_provider *provider = platform_get_drvdata(pdev);
281 imx_icc_unregister_nodes(provider);
283 return icc_provider_del(provider);
285 EXPORT_SYMBOL_GPL(imx_icc_unregister);
287 MODULE_LICENSE("GPL v2");