imx.c 6.7 KB

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