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11#include <linux/device.h>
12#include <linux/interconnect-provider.h>
13#include <linux/module.h>
14#include <linux/of.h>
15#include <linux/of_platform.h>
16#include <linux/platform_device.h>
17#include <linux/pm_qos.h>
18
19#include "imx.h"
20
21
22struct imx_icc_node {
23 const struct imx_icc_node_desc *desc;
24 struct device *qos_dev;
25 struct dev_pm_qos_request qos_req;
26};
27
28static int imx_icc_node_set(struct icc_node *node)
29{
30 struct device *dev = node->provider->dev;
31 struct imx_icc_node *node_data = node->data;
32 u64 freq;
33
34 if (!node_data->qos_dev)
35 return 0;
36
37 freq = (node->avg_bw + node->peak_bw) * node_data->desc->adj->bw_mul;
38 do_div(freq, node_data->desc->adj->bw_div);
39 dev_dbg(dev, "node %s device %s avg_bw %ukBps peak_bw %ukBps min_freq %llukHz\n",
40 node->name, dev_name(node_data->qos_dev),
41 node->avg_bw, node->peak_bw, freq);
42
43 if (freq > S32_MAX) {
44 dev_err(dev, "%s can't request more than S32_MAX freq\n",
45 node->name);
46 return -ERANGE;
47 }
48
49 dev_pm_qos_update_request(&node_data->qos_req, freq);
50
51 return 0;
52}
53
54static int imx_icc_set(struct icc_node *src, struct icc_node *dst)
55{
56 return imx_icc_node_set(dst);
57}
58
59
60static void imx_icc_node_destroy(struct icc_node *node)
61{
62 struct imx_icc_node *node_data = node->data;
63 int ret;
64
65 if (dev_pm_qos_request_active(&node_data->qos_req)) {
66 ret = dev_pm_qos_remove_request(&node_data->qos_req);
67 if (ret)
68 dev_warn(node->provider->dev,
69 "failed to remove qos request for %s\n",
70 dev_name(node_data->qos_dev));
71 }
72
73 put_device(node_data->qos_dev);
74 icc_node_del(node);
75 icc_node_destroy(node->id);
76}
77
78static int imx_icc_node_init_qos(struct icc_provider *provider,
79 struct icc_node *node)
80{
81 struct imx_icc_node *node_data = node->data;
82 const struct imx_icc_node_adj_desc *adj = node_data->desc->adj;
83 struct device *dev = provider->dev;
84 struct device_node *dn = NULL;
85 struct platform_device *pdev;
86
87 if (adj->main_noc) {
88 node_data->qos_dev = dev;
89 dev_dbg(dev, "icc node %s[%d] is main noc itself\n",
90 node->name, node->id);
91 } else {
92 dn = of_parse_phandle(dev->of_node, adj->phandle_name, 0);
93 if (!dn) {
94 dev_warn(dev, "Failed to parse %s\n",
95 adj->phandle_name);
96 return -ENODEV;
97 }
98
99 if (!dn || !of_device_is_available(dn)) {
100 dev_warn(dev, "Missing property %s, skip scaling %s\n",
101 adj->phandle_name, node->name);
102 return 0;
103 }
104
105 pdev = of_find_device_by_node(dn);
106 of_node_put(dn);
107 if (!pdev) {
108 dev_warn(dev, "node %s[%d] missing device for %pOF\n",
109 node->name, node->id, dn);
110 return -EPROBE_DEFER;
111 }
112 node_data->qos_dev = &pdev->dev;
113 dev_dbg(dev, "node %s[%d] has device node %pOF\n",
114 node->name, node->id, dn);
115 }
116
117 return dev_pm_qos_add_request(node_data->qos_dev,
118 &node_data->qos_req,
119 DEV_PM_QOS_MIN_FREQUENCY, 0);
120}
121
122static struct icc_node *imx_icc_node_add(struct icc_provider *provider,
123 const struct imx_icc_node_desc *node_desc)
124{
125 struct device *dev = provider->dev;
126 struct imx_icc_node *node_data;
127 struct icc_node *node;
128 int ret;
129
130 node = icc_node_create(node_desc->id);
131 if (IS_ERR(node)) {
132 dev_err(dev, "failed to create node %d\n", node_desc->id);
133 return node;
134 }
135
136 if (node->data) {
137 dev_err(dev, "already created node %s id=%d\n",
138 node_desc->name, node_desc->id);
139 return ERR_PTR(-EEXIST);
140 }
141
142 node_data = devm_kzalloc(dev, sizeof(*node_data), GFP_KERNEL);
143 if (!node_data) {
144 icc_node_destroy(node->id);
145 return ERR_PTR(-ENOMEM);
146 }
147
148 node->name = node_desc->name;
149 node->data = node_data;
150 node_data->desc = node_desc;
151 icc_node_add(node, provider);
152
153 if (node_desc->adj) {
154 ret = imx_icc_node_init_qos(provider, node);
155 if (ret < 0) {
156 imx_icc_node_destroy(node);
157 return ERR_PTR(ret);
158 }
159 }
160
161 return node;
162}
163
164static void imx_icc_unregister_nodes(struct icc_provider *provider)
165{
166 struct icc_node *node, *tmp;
167
168 list_for_each_entry_safe(node, tmp, &provider->nodes, node_list)
169 imx_icc_node_destroy(node);
170}
171
172static int imx_icc_register_nodes(struct icc_provider *provider,
173 const struct imx_icc_node_desc *descs,
174 int count)
175{
176 struct icc_onecell_data *provider_data = provider->data;
177 int ret;
178 int i;
179
180 for (i = 0; i < count; i++) {
181 struct icc_node *node;
182 const struct imx_icc_node_desc *node_desc = &descs[i];
183 size_t j;
184
185 node = imx_icc_node_add(provider, node_desc);
186 if (IS_ERR(node)) {
187 ret = dev_err_probe(provider->dev, PTR_ERR(node),
188 "failed to add %s\n", node_desc->name);
189 goto err;
190 }
191 provider_data->nodes[node->id] = node;
192
193 for (j = 0; j < node_desc->num_links; j++) {
194 ret = icc_link_create(node, node_desc->links[j]);
195 if (ret) {
196 dev_err(provider->dev, "failed to link node %d to %d: %d\n",
197 node->id, node_desc->links[j], ret);
198 goto err;
199 }
200 }
201 }
202
203 return 0;
204
205err:
206 imx_icc_unregister_nodes(provider);
207
208 return ret;
209}
210
211static int get_max_node_id(struct imx_icc_node_desc *nodes, int nodes_count)
212{
213 int i, ret = 0;
214
215 for (i = 0; i < nodes_count; ++i)
216 if (nodes[i].id > ret)
217 ret = nodes[i].id;
218
219 return ret;
220}
221
222int imx_icc_register(struct platform_device *pdev,
223 struct imx_icc_node_desc *nodes, int nodes_count)
224{
225 struct device *dev = &pdev->dev;
226 struct icc_onecell_data *data;
227 struct icc_provider *provider;
228 int max_node_id;
229 int ret;
230
231
232 max_node_id = get_max_node_id(nodes, nodes_count);
233 data = devm_kzalloc(dev, struct_size(data, nodes, max_node_id),
234 GFP_KERNEL);
235 if (!data)
236 return -ENOMEM;
237 data->num_nodes = max_node_id;
238
239 provider = devm_kzalloc(dev, sizeof(*provider), GFP_KERNEL);
240 if (!provider)
241 return -ENOMEM;
242 provider->set = imx_icc_set;
243 provider->aggregate = icc_std_aggregate;
244 provider->xlate = of_icc_xlate_onecell;
245 provider->data = data;
246 provider->dev = dev->parent;
247 platform_set_drvdata(pdev, provider);
248
249 ret = icc_provider_add(provider);
250 if (ret) {
251 dev_err(dev, "error adding interconnect provider: %d\n", ret);
252 return ret;
253 }
254
255 ret = imx_icc_register_nodes(provider, nodes, nodes_count);
256 if (ret)
257 goto provider_del;
258
259 return 0;
260
261provider_del:
262 icc_provider_del(provider);
263 return ret;
264}
265EXPORT_SYMBOL_GPL(imx_icc_register);
266
267int imx_icc_unregister(struct platform_device *pdev)
268{
269 struct icc_provider *provider = platform_get_drvdata(pdev);
270
271 imx_icc_unregister_nodes(provider);
272
273 return icc_provider_del(provider);
274}
275EXPORT_SYMBOL_GPL(imx_icc_unregister);
276
277MODULE_LICENSE("GPL v2");
278
