reset-uclass.c 7.4 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365
  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * Copyright (c) 2016, NVIDIA CORPORATION.
  4. */
  5. #define LOG_CATEGORY UCLASS_RESET
  6. #include <common.h>
  7. #include <dm.h>
  8. #include <fdtdec.h>
  9. #include <log.h>
  10. #include <malloc.h>
  11. #include <reset.h>
  12. #include <reset-uclass.h>
  13. #include <dm/devres.h>
  14. #include <dm/lists.h>
  15. static inline struct reset_ops *reset_dev_ops(struct udevice *dev)
  16. {
  17. return (struct reset_ops *)dev->driver->ops;
  18. }
  19. static int reset_of_xlate_default(struct reset_ctl *reset_ctl,
  20. struct ofnode_phandle_args *args)
  21. {
  22. debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
  23. if (args->args_count != 1) {
  24. debug("Invaild args_count: %d\n", args->args_count);
  25. return -EINVAL;
  26. }
  27. reset_ctl->id = args->args[0];
  28. return 0;
  29. }
  30. static int reset_get_by_index_tail(int ret, ofnode node,
  31. struct ofnode_phandle_args *args,
  32. const char *list_name, int index,
  33. struct reset_ctl *reset_ctl)
  34. {
  35. struct udevice *dev_reset;
  36. struct reset_ops *ops;
  37. assert(reset_ctl);
  38. reset_ctl->dev = NULL;
  39. if (ret)
  40. return ret;
  41. ret = uclass_get_device_by_ofnode(UCLASS_RESET, args->node,
  42. &dev_reset);
  43. if (ret) {
  44. debug("%s: uclass_get_device_by_ofnode() failed: %d\n",
  45. __func__, ret);
  46. debug("%s %d\n", ofnode_get_name(args->node), args->args[0]);
  47. return ret;
  48. }
  49. ops = reset_dev_ops(dev_reset);
  50. reset_ctl->dev = dev_reset;
  51. if (ops->of_xlate)
  52. ret = ops->of_xlate(reset_ctl, args);
  53. else
  54. ret = reset_of_xlate_default(reset_ctl, args);
  55. if (ret) {
  56. debug("of_xlate() failed: %d\n", ret);
  57. return ret;
  58. }
  59. ret = ops->request(reset_ctl);
  60. if (ret) {
  61. debug("ops->request() failed: %d\n", ret);
  62. return ret;
  63. }
  64. return 0;
  65. }
  66. int reset_get_by_index(struct udevice *dev, int index,
  67. struct reset_ctl *reset_ctl)
  68. {
  69. struct ofnode_phandle_args args;
  70. int ret;
  71. ret = dev_read_phandle_with_args(dev, "resets", "#reset-cells", 0,
  72. index, &args);
  73. return reset_get_by_index_tail(ret, dev_ofnode(dev), &args, "resets",
  74. index > 0, reset_ctl);
  75. }
  76. int reset_get_by_index_nodev(ofnode node, int index,
  77. struct reset_ctl *reset_ctl)
  78. {
  79. struct ofnode_phandle_args args;
  80. int ret;
  81. ret = ofnode_parse_phandle_with_args(node, "resets", "#reset-cells", 0,
  82. index, &args);
  83. return reset_get_by_index_tail(ret, node, &args, "resets",
  84. index > 0, reset_ctl);
  85. }
  86. static int __reset_get_bulk(struct udevice *dev, ofnode node,
  87. struct reset_ctl_bulk *bulk)
  88. {
  89. int i, ret, err, count;
  90. bulk->count = 0;
  91. count = ofnode_count_phandle_with_args(node, "resets", "#reset-cells",
  92. 0);
  93. if (count < 1)
  94. return count;
  95. bulk->resets = devm_kcalloc(dev, count, sizeof(struct reset_ctl),
  96. GFP_KERNEL);
  97. if (!bulk->resets)
  98. return -ENOMEM;
  99. for (i = 0; i < count; i++) {
  100. ret = reset_get_by_index_nodev(node, i, &bulk->resets[i]);
  101. if (ret < 0)
  102. goto bulk_get_err;
  103. ++bulk->count;
  104. }
  105. return 0;
  106. bulk_get_err:
  107. err = reset_release_all(bulk->resets, bulk->count);
  108. if (err)
  109. debug("%s: could release all resets for %p\n",
  110. __func__, dev);
  111. return ret;
  112. }
  113. int reset_get_bulk(struct udevice *dev, struct reset_ctl_bulk *bulk)
  114. {
  115. return __reset_get_bulk(dev, dev_ofnode(dev), bulk);
  116. }
  117. int reset_get_by_name(struct udevice *dev, const char *name,
  118. struct reset_ctl *reset_ctl)
  119. {
  120. int index;
  121. debug("%s(dev=%p, name=%s, reset_ctl=%p)\n", __func__, dev, name,
  122. reset_ctl);
  123. reset_ctl->dev = NULL;
  124. index = dev_read_stringlist_search(dev, "reset-names", name);
  125. if (index < 0) {
  126. debug("fdt_stringlist_search() failed: %d\n", index);
  127. return index;
  128. }
  129. return reset_get_by_index(dev, index, reset_ctl);
  130. }
  131. int reset_request(struct reset_ctl *reset_ctl)
  132. {
  133. struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
  134. debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
  135. return ops->request(reset_ctl);
  136. }
  137. int reset_free(struct reset_ctl *reset_ctl)
  138. {
  139. struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
  140. debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
  141. return ops->rfree(reset_ctl);
  142. }
  143. int reset_assert(struct reset_ctl *reset_ctl)
  144. {
  145. struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
  146. debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
  147. return ops->rst_assert(reset_ctl);
  148. }
  149. int reset_assert_bulk(struct reset_ctl_bulk *bulk)
  150. {
  151. int i, ret;
  152. for (i = 0; i < bulk->count; i++) {
  153. ret = reset_assert(&bulk->resets[i]);
  154. if (ret < 0)
  155. return ret;
  156. }
  157. return 0;
  158. }
  159. int reset_deassert(struct reset_ctl *reset_ctl)
  160. {
  161. struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
  162. debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
  163. return ops->rst_deassert(reset_ctl);
  164. }
  165. int reset_deassert_bulk(struct reset_ctl_bulk *bulk)
  166. {
  167. int i, ret;
  168. for (i = 0; i < bulk->count; i++) {
  169. ret = reset_deassert(&bulk->resets[i]);
  170. if (ret < 0)
  171. return ret;
  172. }
  173. return 0;
  174. }
  175. int reset_status(struct reset_ctl *reset_ctl)
  176. {
  177. struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
  178. debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
  179. return ops->rst_status(reset_ctl);
  180. }
  181. int reset_release_all(struct reset_ctl *reset_ctl, int count)
  182. {
  183. int i, ret;
  184. for (i = 0; i < count; i++) {
  185. debug("%s(reset_ctl[%d]=%p)\n", __func__, i, &reset_ctl[i]);
  186. /* check if reset has been previously requested */
  187. if (!reset_ctl[i].dev)
  188. continue;
  189. ret = reset_assert(&reset_ctl[i]);
  190. if (ret)
  191. return ret;
  192. ret = reset_free(&reset_ctl[i]);
  193. if (ret)
  194. return ret;
  195. }
  196. return 0;
  197. }
  198. static void devm_reset_release(struct udevice *dev, void *res)
  199. {
  200. reset_free(res);
  201. }
  202. struct reset_ctl *devm_reset_control_get_by_index(struct udevice *dev,
  203. int index)
  204. {
  205. int rc;
  206. struct reset_ctl *reset_ctl;
  207. reset_ctl = devres_alloc(devm_reset_release, sizeof(struct reset_ctl),
  208. __GFP_ZERO);
  209. if (unlikely(!reset_ctl))
  210. return ERR_PTR(-ENOMEM);
  211. rc = reset_get_by_index(dev, index, reset_ctl);
  212. if (rc)
  213. return ERR_PTR(rc);
  214. devres_add(dev, reset_ctl);
  215. return reset_ctl;
  216. }
  217. struct reset_ctl *devm_reset_control_get(struct udevice *dev, const char *id)
  218. {
  219. int rc;
  220. struct reset_ctl *reset_ctl;
  221. reset_ctl = devres_alloc(devm_reset_release, sizeof(struct reset_ctl),
  222. __GFP_ZERO);
  223. if (unlikely(!reset_ctl))
  224. return ERR_PTR(-ENOMEM);
  225. rc = reset_get_by_name(dev, id, reset_ctl);
  226. if (rc)
  227. return ERR_PTR(rc);
  228. devres_add(dev, reset_ctl);
  229. return reset_ctl;
  230. }
  231. struct reset_ctl *devm_reset_control_get_optional(struct udevice *dev,
  232. const char *id)
  233. {
  234. struct reset_ctl *r = devm_reset_control_get(dev, id);
  235. if (IS_ERR(r))
  236. return NULL;
  237. return r;
  238. }
  239. static void devm_reset_bulk_release(struct udevice *dev, void *res)
  240. {
  241. struct reset_ctl_bulk *bulk = res;
  242. reset_release_all(bulk->resets, bulk->count);
  243. }
  244. struct reset_ctl_bulk *devm_reset_bulk_get_by_node(struct udevice *dev,
  245. ofnode node)
  246. {
  247. int rc;
  248. struct reset_ctl_bulk *bulk;
  249. bulk = devres_alloc(devm_reset_bulk_release,
  250. sizeof(struct reset_ctl_bulk),
  251. __GFP_ZERO);
  252. if (unlikely(!bulk))
  253. return ERR_PTR(-ENOMEM);
  254. rc = __reset_get_bulk(dev, node, bulk);
  255. if (rc)
  256. return ERR_PTR(rc);
  257. devres_add(dev, bulk);
  258. return bulk;
  259. }
  260. struct reset_ctl_bulk *devm_reset_bulk_get_optional_by_node(struct udevice *dev,
  261. ofnode node)
  262. {
  263. struct reset_ctl_bulk *bulk;
  264. bulk = devm_reset_bulk_get_by_node(dev, node);
  265. if (IS_ERR(bulk))
  266. return NULL;
  267. return bulk;
  268. }
  269. struct reset_ctl_bulk *devm_reset_bulk_get(struct udevice *dev)
  270. {
  271. return devm_reset_bulk_get_by_node(dev, dev_ofnode(dev));
  272. }
  273. struct reset_ctl_bulk *devm_reset_bulk_get_optional(struct udevice *dev)
  274. {
  275. return devm_reset_bulk_get_optional_by_node(dev, dev_ofnode(dev));
  276. }
  277. UCLASS_DRIVER(reset) = {
  278. .id = UCLASS_RESET,
  279. .name = "reset",
  280. };