reset-uclass.c 7.4 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362
  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * Copyright (c) 2016, NVIDIA CORPORATION.
  4. */
  5. #include <common.h>
  6. #include <dm.h>
  7. #include <fdtdec.h>
  8. #include <log.h>
  9. #include <malloc.h>
  10. #include <reset.h>
  11. #include <reset-uclass.h>
  12. #include <dm/devres.h>
  13. #include <dm/lists.h>
  14. static inline struct reset_ops *reset_dev_ops(struct udevice *dev)
  15. {
  16. return (struct reset_ops *)dev->driver->ops;
  17. }
  18. static int reset_of_xlate_default(struct reset_ctl *reset_ctl,
  19. struct ofnode_phandle_args *args)
  20. {
  21. debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
  22. if (args->args_count != 1) {
  23. debug("Invaild args_count: %d\n", args->args_count);
  24. return -EINVAL;
  25. }
  26. reset_ctl->id = args->args[0];
  27. return 0;
  28. }
  29. static int reset_get_by_index_tail(int ret, ofnode node,
  30. struct ofnode_phandle_args *args,
  31. const char *list_name, int index,
  32. struct reset_ctl *reset_ctl)
  33. {
  34. struct udevice *dev_reset;
  35. struct reset_ops *ops;
  36. assert(reset_ctl);
  37. reset_ctl->dev = NULL;
  38. if (ret)
  39. return ret;
  40. ret = uclass_get_device_by_ofnode(UCLASS_RESET, args->node,
  41. &dev_reset);
  42. if (ret) {
  43. debug("%s: uclass_get_device_by_ofnode() failed: %d\n",
  44. __func__, ret);
  45. debug("%s %d\n", ofnode_get_name(args->node), args->args[0]);
  46. return ret;
  47. }
  48. ops = reset_dev_ops(dev_reset);
  49. reset_ctl->dev = dev_reset;
  50. if (ops->of_xlate)
  51. ret = ops->of_xlate(reset_ctl, args);
  52. else
  53. ret = reset_of_xlate_default(reset_ctl, args);
  54. if (ret) {
  55. debug("of_xlate() failed: %d\n", ret);
  56. return ret;
  57. }
  58. ret = ops->request(reset_ctl);
  59. if (ret) {
  60. debug("ops->request() failed: %d\n", ret);
  61. return ret;
  62. }
  63. return 0;
  64. }
  65. int reset_get_by_index(struct udevice *dev, int index,
  66. struct reset_ctl *reset_ctl)
  67. {
  68. struct ofnode_phandle_args args;
  69. int ret;
  70. ret = dev_read_phandle_with_args(dev, "resets", "#reset-cells", 0,
  71. index, &args);
  72. return reset_get_by_index_tail(ret, dev_ofnode(dev), &args, "resets",
  73. index > 0, reset_ctl);
  74. }
  75. int reset_get_by_index_nodev(ofnode node, int index,
  76. struct reset_ctl *reset_ctl)
  77. {
  78. struct ofnode_phandle_args args;
  79. int ret;
  80. ret = ofnode_parse_phandle_with_args(node, "resets", "#reset-cells", 0,
  81. index > 0, &args);
  82. return reset_get_by_index_tail(ret, node, &args, "resets",
  83. index > 0, reset_ctl);
  84. }
  85. static int __reset_get_bulk(struct udevice *dev, ofnode node,
  86. struct reset_ctl_bulk *bulk)
  87. {
  88. int i, ret, err, count;
  89. bulk->count = 0;
  90. count = ofnode_count_phandle_with_args(node, "resets", "#reset-cells");
  91. if (count < 1)
  92. return count;
  93. bulk->resets = devm_kcalloc(dev, count, sizeof(struct reset_ctl),
  94. GFP_KERNEL);
  95. if (!bulk->resets)
  96. return -ENOMEM;
  97. for (i = 0; i < count; i++) {
  98. ret = reset_get_by_index_nodev(node, i, &bulk->resets[i]);
  99. if (ret < 0)
  100. goto bulk_get_err;
  101. ++bulk->count;
  102. }
  103. return 0;
  104. bulk_get_err:
  105. err = reset_release_all(bulk->resets, bulk->count);
  106. if (err)
  107. debug("%s: could release all resets for %p\n",
  108. __func__, dev);
  109. return ret;
  110. }
  111. int reset_get_bulk(struct udevice *dev, struct reset_ctl_bulk *bulk)
  112. {
  113. return __reset_get_bulk(dev, dev_ofnode(dev), bulk);
  114. }
  115. int reset_get_by_name(struct udevice *dev, const char *name,
  116. struct reset_ctl *reset_ctl)
  117. {
  118. int index;
  119. debug("%s(dev=%p, name=%s, reset_ctl=%p)\n", __func__, dev, name,
  120. reset_ctl);
  121. reset_ctl->dev = NULL;
  122. index = dev_read_stringlist_search(dev, "reset-names", name);
  123. if (index < 0) {
  124. debug("fdt_stringlist_search() failed: %d\n", index);
  125. return index;
  126. }
  127. return reset_get_by_index(dev, index, reset_ctl);
  128. }
  129. int reset_request(struct reset_ctl *reset_ctl)
  130. {
  131. struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
  132. debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
  133. return ops->request(reset_ctl);
  134. }
  135. int reset_free(struct reset_ctl *reset_ctl)
  136. {
  137. struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
  138. debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
  139. return ops->rfree(reset_ctl);
  140. }
  141. int reset_assert(struct reset_ctl *reset_ctl)
  142. {
  143. struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
  144. debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
  145. return ops->rst_assert(reset_ctl);
  146. }
  147. int reset_assert_bulk(struct reset_ctl_bulk *bulk)
  148. {
  149. int i, ret;
  150. for (i = 0; i < bulk->count; i++) {
  151. ret = reset_assert(&bulk->resets[i]);
  152. if (ret < 0)
  153. return ret;
  154. }
  155. return 0;
  156. }
  157. int reset_deassert(struct reset_ctl *reset_ctl)
  158. {
  159. struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
  160. debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
  161. return ops->rst_deassert(reset_ctl);
  162. }
  163. int reset_deassert_bulk(struct reset_ctl_bulk *bulk)
  164. {
  165. int i, ret;
  166. for (i = 0; i < bulk->count; i++) {
  167. ret = reset_deassert(&bulk->resets[i]);
  168. if (ret < 0)
  169. return ret;
  170. }
  171. return 0;
  172. }
  173. int reset_status(struct reset_ctl *reset_ctl)
  174. {
  175. struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
  176. debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
  177. return ops->rst_status(reset_ctl);
  178. }
  179. int reset_release_all(struct reset_ctl *reset_ctl, int count)
  180. {
  181. int i, ret;
  182. for (i = 0; i < count; i++) {
  183. debug("%s(reset_ctl[%d]=%p)\n", __func__, i, &reset_ctl[i]);
  184. /* check if reset has been previously requested */
  185. if (!reset_ctl[i].dev)
  186. continue;
  187. ret = reset_assert(&reset_ctl[i]);
  188. if (ret)
  189. return ret;
  190. ret = reset_free(&reset_ctl[i]);
  191. if (ret)
  192. return ret;
  193. }
  194. return 0;
  195. }
  196. static void devm_reset_release(struct udevice *dev, void *res)
  197. {
  198. reset_free(res);
  199. }
  200. struct reset_ctl *devm_reset_control_get_by_index(struct udevice *dev,
  201. int index)
  202. {
  203. int rc;
  204. struct reset_ctl *reset_ctl;
  205. reset_ctl = devres_alloc(devm_reset_release, sizeof(struct reset_ctl),
  206. __GFP_ZERO);
  207. if (unlikely(!reset_ctl))
  208. return ERR_PTR(-ENOMEM);
  209. rc = reset_get_by_index(dev, index, reset_ctl);
  210. if (rc)
  211. return ERR_PTR(rc);
  212. devres_add(dev, reset_ctl);
  213. return reset_ctl;
  214. }
  215. struct reset_ctl *devm_reset_control_get(struct udevice *dev, const char *id)
  216. {
  217. int rc;
  218. struct reset_ctl *reset_ctl;
  219. reset_ctl = devres_alloc(devm_reset_release, sizeof(struct reset_ctl),
  220. __GFP_ZERO);
  221. if (unlikely(!reset_ctl))
  222. return ERR_PTR(-ENOMEM);
  223. rc = reset_get_by_name(dev, id, reset_ctl);
  224. if (rc)
  225. return ERR_PTR(rc);
  226. devres_add(dev, reset_ctl);
  227. return reset_ctl;
  228. }
  229. struct reset_ctl *devm_reset_control_get_optional(struct udevice *dev,
  230. const char *id)
  231. {
  232. struct reset_ctl *r = devm_reset_control_get(dev, id);
  233. if (IS_ERR(r))
  234. return NULL;
  235. return r;
  236. }
  237. static void devm_reset_bulk_release(struct udevice *dev, void *res)
  238. {
  239. struct reset_ctl_bulk *bulk = res;
  240. reset_release_all(bulk->resets, bulk->count);
  241. }
  242. struct reset_ctl_bulk *devm_reset_bulk_get_by_node(struct udevice *dev,
  243. ofnode node)
  244. {
  245. int rc;
  246. struct reset_ctl_bulk *bulk;
  247. bulk = devres_alloc(devm_reset_bulk_release,
  248. sizeof(struct reset_ctl_bulk),
  249. __GFP_ZERO);
  250. if (unlikely(!bulk))
  251. return ERR_PTR(-ENOMEM);
  252. rc = __reset_get_bulk(dev, node, bulk);
  253. if (rc)
  254. return ERR_PTR(rc);
  255. devres_add(dev, bulk);
  256. return bulk;
  257. }
  258. struct reset_ctl_bulk *devm_reset_bulk_get_optional_by_node(struct udevice *dev,
  259. ofnode node)
  260. {
  261. struct reset_ctl_bulk *bulk;
  262. bulk = devm_reset_bulk_get_by_node(dev, node);
  263. if (IS_ERR(bulk))
  264. return NULL;
  265. return bulk;
  266. }
  267. struct reset_ctl_bulk *devm_reset_bulk_get(struct udevice *dev)
  268. {
  269. return devm_reset_bulk_get_by_node(dev, dev_ofnode(dev));
  270. }
  271. struct reset_ctl_bulk *devm_reset_bulk_get_optional(struct udevice *dev)
  272. {
  273. return devm_reset_bulk_get_optional_by_node(dev, dev_ofnode(dev));
  274. }
  275. UCLASS_DRIVER(reset) = {
  276. .id = UCLASS_RESET,
  277. .name = "reset",
  278. };