xref: /openbmc/linux/drivers/interconnect/imx/imx.c (revision 9fbd3552)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Interconnect framework driver for i.MX SoC
4  *
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>
9  */
10 
11 #include <linux/device.h>
12 #include <linux/interconnect-provider.h>
13 #include <linux/io.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/of_platform.h>
17 #include <linux/platform_device.h>
18 #include <linux/pm_qos.h>
19 
20 #include "imx.h"
21 
22 /* private icc_node data */
23 struct imx_icc_node {
24 	const struct imx_icc_node_desc *desc;
25 	const struct imx_icc_noc_setting *setting;
26 	struct device *qos_dev;
27 	struct dev_pm_qos_request qos_req;
28 	struct imx_icc_provider *imx_provider;
29 };
30 
imx_icc_get_bw(struct icc_node * node,u32 * avg,u32 * peak)31 static int imx_icc_get_bw(struct icc_node *node, u32 *avg, u32 *peak)
32 {
33 	*avg = 0;
34 	*peak = 0;
35 
36 	return 0;
37 }
38 
imx_icc_node_set(struct icc_node * node)39 static int imx_icc_node_set(struct icc_node *node)
40 {
41 	struct device *dev = node->provider->dev;
42 	struct imx_icc_node *node_data = node->data;
43 	void __iomem *base;
44 	u32 prio;
45 	u64 freq;
46 
47 	if (node_data->setting && node->peak_bw) {
48 		base = node_data->setting->reg + node_data->imx_provider->noc_base;
49 		if (node_data->setting->mode == IMX_NOC_MODE_FIXED) {
50 			prio = node_data->setting->prio_level;
51 			prio = PRIORITY_COMP_MARK | (prio << 8) | prio;
52 			writel(prio, base + IMX_NOC_PRIO_REG);
53 			writel(node_data->setting->mode, base + IMX_NOC_MODE_REG);
54 			writel(node_data->setting->ext_control, base + IMX_NOC_EXT_CTL_REG);
55 			dev_dbg(dev, "%s: mode: 0x%x, prio: 0x%x, ext_control: 0x%x\n",
56 				node_data->desc->name, node_data->setting->mode, prio,
57 				node_data->setting->ext_control);
58 		} else if (node_data->setting->mode == IMX_NOC_MODE_UNCONFIGURED) {
59 			dev_dbg(dev, "%s: mode not unconfigured\n", node_data->desc->name);
60 		} else {
61 			dev_info(dev, "%s: mode: %d not supported\n",
62 				 node_data->desc->name, node_data->setting->mode);
63 			return -EOPNOTSUPP;
64 		}
65 	}
66 
67 	if (!node_data->qos_dev)
68 		return 0;
69 
70 	freq = (node->avg_bw + node->peak_bw) * node_data->desc->adj->bw_mul;
71 	do_div(freq, node_data->desc->adj->bw_div);
72 	dev_dbg(dev, "node %s device %s avg_bw %ukBps peak_bw %ukBps min_freq %llukHz\n",
73 		node->name, dev_name(node_data->qos_dev),
74 		node->avg_bw, node->peak_bw, freq);
75 
76 	if (freq > S32_MAX) {
77 		dev_err(dev, "%s can't request more than S32_MAX freq\n",
78 				node->name);
79 		return -ERANGE;
80 	}
81 
82 	dev_pm_qos_update_request(&node_data->qos_req, freq);
83 
84 	return 0;
85 }
86 
imx_icc_set(struct icc_node * src,struct icc_node * dst)87 static int imx_icc_set(struct icc_node *src, struct icc_node *dst)
88 {
89 	int ret;
90 
91 	ret = imx_icc_node_set(src);
92 	if (ret)
93 		return ret;
94 
95 	return imx_icc_node_set(dst);
96 }
97 
98 /* imx_icc_node_destroy() - Destroy an imx icc_node, including private data */
imx_icc_node_destroy(struct icc_node * node)99 static void imx_icc_node_destroy(struct icc_node *node)
100 {
101 	struct imx_icc_node *node_data = node->data;
102 	int ret;
103 
104 	if (dev_pm_qos_request_active(&node_data->qos_req)) {
105 		ret = dev_pm_qos_remove_request(&node_data->qos_req);
106 		if (ret)
107 			dev_warn(node->provider->dev,
108 				 "failed to remove qos request for %s\n",
109 				 dev_name(node_data->qos_dev));
110 	}
111 
112 	put_device(node_data->qos_dev);
113 	icc_node_del(node);
114 	icc_node_destroy(node->id);
115 }
116 
imx_icc_node_init_qos(struct icc_provider * provider,struct icc_node * node)117 static int imx_icc_node_init_qos(struct icc_provider *provider,
118 				 struct icc_node *node)
119 {
120 	struct imx_icc_node *node_data = node->data;
121 	const struct imx_icc_node_adj_desc *adj = node_data->desc->adj;
122 	struct device *dev = provider->dev;
123 	struct device_node *dn = NULL;
124 	struct platform_device *pdev;
125 
126 	if (adj->main_noc) {
127 		node_data->qos_dev = dev;
128 		dev_dbg(dev, "icc node %s[%d] is main noc itself\n",
129 			node->name, node->id);
130 	} else {
131 		dn = of_parse_phandle(dev->of_node, adj->phandle_name, 0);
132 		if (!dn) {
133 			dev_warn(dev, "Failed to parse %s\n",
134 				 adj->phandle_name);
135 			return -ENODEV;
136 		}
137 		/* Allow scaling to be disabled on a per-node basis */
138 		if (!of_device_is_available(dn)) {
139 			dev_warn(dev, "Missing property %s, skip scaling %s\n",
140 				 adj->phandle_name, node->name);
141 			of_node_put(dn);
142 			return 0;
143 		}
144 
145 		pdev = of_find_device_by_node(dn);
146 		of_node_put(dn);
147 		if (!pdev) {
148 			dev_warn(dev, "node %s[%d] missing device for %pOF\n",
149 				 node->name, node->id, dn);
150 			return -EPROBE_DEFER;
151 		}
152 		node_data->qos_dev = &pdev->dev;
153 		dev_dbg(dev, "node %s[%d] has device node %pOF\n",
154 			node->name, node->id, dn);
155 	}
156 
157 	return dev_pm_qos_add_request(node_data->qos_dev,
158 				      &node_data->qos_req,
159 				      DEV_PM_QOS_MIN_FREQUENCY, 0);
160 }
161 
imx_icc_node_add(struct imx_icc_provider * imx_provider,const struct imx_icc_node_desc * node_desc,const struct imx_icc_noc_setting * setting)162 static struct icc_node *imx_icc_node_add(struct imx_icc_provider *imx_provider,
163 					 const struct imx_icc_node_desc *node_desc,
164 					 const struct imx_icc_noc_setting *setting)
165 {
166 	struct icc_provider *provider = &imx_provider->provider;
167 	struct device *dev = provider->dev;
168 	struct imx_icc_node *node_data;
169 	struct icc_node *node;
170 	int ret;
171 
172 	node = icc_node_create(node_desc->id);
173 	if (IS_ERR(node)) {
174 		dev_err(dev, "failed to create node %d\n", node_desc->id);
175 		return node;
176 	}
177 
178 	if (node->data) {
179 		dev_err(dev, "already created node %s id=%d\n",
180 			node_desc->name, node_desc->id);
181 		return ERR_PTR(-EEXIST);
182 	}
183 
184 	node_data = devm_kzalloc(dev, sizeof(*node_data), GFP_KERNEL);
185 	if (!node_data) {
186 		icc_node_destroy(node->id);
187 		return ERR_PTR(-ENOMEM);
188 	}
189 
190 	node->name = node_desc->name;
191 	node->data = node_data;
192 	node_data->desc = node_desc;
193 	node_data->setting = setting;
194 	node_data->imx_provider = imx_provider;
195 	icc_node_add(node, provider);
196 
197 	if (node_desc->adj) {
198 		ret = imx_icc_node_init_qos(provider, node);
199 		if (ret < 0) {
200 			imx_icc_node_destroy(node);
201 			return ERR_PTR(ret);
202 		}
203 	}
204 
205 	return node;
206 }
207 
imx_icc_unregister_nodes(struct icc_provider * provider)208 static void imx_icc_unregister_nodes(struct icc_provider *provider)
209 {
210 	struct icc_node *node, *tmp;
211 
212 	list_for_each_entry_safe(node, tmp, &provider->nodes, node_list)
213 		imx_icc_node_destroy(node);
214 }
215 
imx_icc_register_nodes(struct imx_icc_provider * imx_provider,const struct imx_icc_node_desc * descs,int count,const struct imx_icc_noc_setting * settings)216 static int imx_icc_register_nodes(struct imx_icc_provider *imx_provider,
217 				  const struct imx_icc_node_desc *descs,
218 				  int count,
219 				  const struct imx_icc_noc_setting *settings)
220 {
221 	struct icc_provider *provider = &imx_provider->provider;
222 	struct icc_onecell_data *provider_data = provider->data;
223 	int ret;
224 	int i;
225 
226 	for (i = 0; i < count; i++) {
227 		struct icc_node *node;
228 		const struct imx_icc_node_desc *node_desc = &descs[i];
229 		size_t j;
230 
231 		node = imx_icc_node_add(imx_provider, node_desc,
232 					settings ? &settings[node_desc->id] : NULL);
233 		if (IS_ERR(node)) {
234 			ret = dev_err_probe(provider->dev, PTR_ERR(node),
235 					    "failed to add %s\n", node_desc->name);
236 			goto err;
237 		}
238 		provider_data->nodes[node->id] = node;
239 
240 		for (j = 0; j < node_desc->num_links; j++) {
241 			ret = icc_link_create(node, node_desc->links[j]);
242 			if (ret) {
243 				dev_err(provider->dev, "failed to link node %d to %d: %d\n",
244 					node->id, node_desc->links[j], ret);
245 				goto err;
246 			}
247 		}
248 	}
249 
250 	return 0;
251 
252 err:
253 	imx_icc_unregister_nodes(provider);
254 
255 	return ret;
256 }
257 
get_max_node_id(struct imx_icc_node_desc * nodes,int nodes_count)258 static int get_max_node_id(struct imx_icc_node_desc *nodes, int nodes_count)
259 {
260 	int i, ret = 0;
261 
262 	for (i = 0; i < nodes_count; ++i)
263 		if (nodes[i].id > ret)
264 			ret = nodes[i].id;
265 
266 	return ret;
267 }
268 
imx_icc_register(struct platform_device * pdev,struct imx_icc_node_desc * nodes,int nodes_count,struct imx_icc_noc_setting * settings)269 int imx_icc_register(struct platform_device *pdev,
270 		     struct imx_icc_node_desc *nodes, int nodes_count,
271 		     struct imx_icc_noc_setting *settings)
272 {
273 	struct device *dev = &pdev->dev;
274 	struct icc_onecell_data *data;
275 	struct imx_icc_provider *imx_provider;
276 	struct icc_provider *provider;
277 	int num_nodes;
278 	int ret;
279 
280 	/* icc_onecell_data is indexed by node_id, unlike nodes param */
281 	num_nodes = get_max_node_id(nodes, nodes_count) + 1;
282 	data = devm_kzalloc(dev, struct_size(data, nodes, num_nodes),
283 			    GFP_KERNEL);
284 	if (!data)
285 		return -ENOMEM;
286 	data->num_nodes = num_nodes;
287 
288 	imx_provider = devm_kzalloc(dev, sizeof(*imx_provider), GFP_KERNEL);
289 	if (!imx_provider)
290 		return -ENOMEM;
291 	provider = &imx_provider->provider;
292 	provider->set = imx_icc_set;
293 	provider->get_bw = imx_icc_get_bw;
294 	provider->aggregate = icc_std_aggregate;
295 	provider->xlate = of_icc_xlate_onecell;
296 	provider->data = data;
297 	provider->dev = dev->parent;
298 
299 	icc_provider_init(provider);
300 
301 	platform_set_drvdata(pdev, imx_provider);
302 
303 	if (settings) {
304 		imx_provider->noc_base = devm_of_iomap(dev, provider->dev->of_node, 0, NULL);
305 		if (IS_ERR(imx_provider->noc_base)) {
306 			ret = PTR_ERR(imx_provider->noc_base);
307 			dev_err(dev, "Error mapping NoC: %d\n", ret);
308 			return ret;
309 		}
310 	}
311 
312 	ret = imx_icc_register_nodes(imx_provider, nodes, nodes_count, settings);
313 	if (ret)
314 		return ret;
315 
316 	ret = icc_provider_register(provider);
317 	if (ret)
318 		goto err_unregister_nodes;
319 
320 	return 0;
321 
322 err_unregister_nodes:
323 	imx_icc_unregister_nodes(&imx_provider->provider);
324 	return ret;
325 }
326 EXPORT_SYMBOL_GPL(imx_icc_register);
327 
imx_icc_unregister(struct platform_device * pdev)328 void imx_icc_unregister(struct platform_device *pdev)
329 {
330 	struct imx_icc_provider *imx_provider = platform_get_drvdata(pdev);
331 
332 	icc_provider_deregister(&imx_provider->provider);
333 	imx_icc_unregister_nodes(&imx_provider->provider);
334 }
335 EXPORT_SYMBOL_GPL(imx_icc_unregister);
336 
337 MODULE_LICENSE("GPL v2");
338