pinctrl-generic.c 9.0 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
  4. */
  5. #include <common.h>
  6. #include <dm.h>
  7. #include <dm/device_compat.h>
  8. #include <linux/compat.h>
  9. #include <dm/pinctrl.h>
  10. /**
  11. * pinctrl_pin_name_to_selector() - return the pin selector for a pin
  12. *
  13. * @dev: pin controller device
  14. * @pin: the pin name to look up
  15. * @return: pin selector, or negative error code on failure
  16. */
  17. static int pinctrl_pin_name_to_selector(struct udevice *dev, const char *pin)
  18. {
  19. const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
  20. unsigned npins, selector;
  21. if (!ops->get_pins_count || !ops->get_pin_name) {
  22. dev_dbg(dev, "get_pins_count or get_pin_name missing\n");
  23. return -ENOSYS;
  24. }
  25. npins = ops->get_pins_count(dev);
  26. /* See if this pctldev has this pin */
  27. for (selector = 0; selector < npins; selector++) {
  28. const char *pname = ops->get_pin_name(dev, selector);
  29. if (!strcmp(pin, pname))
  30. return selector;
  31. }
  32. return -ENOSYS;
  33. }
  34. /**
  35. * pinctrl_group_name_to_selector() - return the group selector for a group
  36. *
  37. * @dev: pin controller device
  38. * @group: the pin group name to look up
  39. * @return: pin group selector, or negative error code on failure
  40. */
  41. static int pinctrl_group_name_to_selector(struct udevice *dev,
  42. const char *group)
  43. {
  44. const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
  45. unsigned ngroups, selector;
  46. if (!ops->get_groups_count || !ops->get_group_name) {
  47. dev_dbg(dev, "get_groups_count or get_group_name missing\n");
  48. return -ENOSYS;
  49. }
  50. ngroups = ops->get_groups_count(dev);
  51. /* See if this pctldev has this group */
  52. for (selector = 0; selector < ngroups; selector++) {
  53. const char *gname = ops->get_group_name(dev, selector);
  54. if (!strcmp(group, gname))
  55. return selector;
  56. }
  57. return -ENOSYS;
  58. }
  59. #if CONFIG_IS_ENABLED(PINMUX)
  60. /**
  61. * pinmux_func_name_to_selector() - return the function selector for a function
  62. *
  63. * @dev: pin controller device
  64. * @function: the function name to look up
  65. * @return: function selector, or negative error code on failure
  66. */
  67. static int pinmux_func_name_to_selector(struct udevice *dev,
  68. const char *function)
  69. {
  70. const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
  71. unsigned nfuncs, selector = 0;
  72. if (!ops->get_functions_count || !ops->get_function_name) {
  73. dev_dbg(dev,
  74. "get_functions_count or get_function_name missing\n");
  75. return -ENOSYS;
  76. }
  77. nfuncs = ops->get_functions_count(dev);
  78. /* See if this pctldev has this function */
  79. for (selector = 0; selector < nfuncs; selector++) {
  80. const char *fname = ops->get_function_name(dev, selector);
  81. if (!strcmp(function, fname))
  82. return selector;
  83. }
  84. return -ENOSYS;
  85. }
  86. /**
  87. * pinmux_enable_setting() - enable pin-mux setting for a certain pin/group
  88. *
  89. * @dev: pin controller device
  90. * @is_group: target of operation (true: pin group, false: pin)
  91. * @selector: pin selector or group selector, depending on @is_group
  92. * @func_selector: function selector
  93. * @return: 0 on success, or negative error code on failure
  94. */
  95. static int pinmux_enable_setting(struct udevice *dev, bool is_group,
  96. unsigned selector, unsigned func_selector)
  97. {
  98. const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
  99. if (is_group) {
  100. if (!ops->pinmux_group_set) {
  101. dev_dbg(dev, "pinmux_group_set op missing\n");
  102. return -ENOSYS;
  103. }
  104. return ops->pinmux_group_set(dev, selector, func_selector);
  105. } else {
  106. if (!ops->pinmux_set) {
  107. dev_dbg(dev, "pinmux_set op missing\n");
  108. return -ENOSYS;
  109. }
  110. return ops->pinmux_set(dev, selector, func_selector);
  111. }
  112. }
  113. #else
  114. static int pinmux_func_name_to_selector(struct udevice *dev,
  115. const char *function)
  116. {
  117. return 0;
  118. }
  119. static int pinmux_enable_setting(struct udevice *dev, bool is_group,
  120. unsigned selector, unsigned func_selector)
  121. {
  122. return 0;
  123. }
  124. #endif
  125. #if CONFIG_IS_ENABLED(PINCONF)
  126. /**
  127. * pinconf_prop_name_to_param() - return parameter ID for a property name
  128. *
  129. * @dev: pin controller device
  130. * @property: property name in DTS, such as "bias-pull-up", "slew-rate", etc.
  131. * @default_value: return default value in case no value is specified in DTS
  132. * @return: return pamater ID, or negative error code on failure
  133. */
  134. static int pinconf_prop_name_to_param(struct udevice *dev,
  135. const char *property, u32 *default_value)
  136. {
  137. const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
  138. const struct pinconf_param *p, *end;
  139. if (!ops->pinconf_num_params || !ops->pinconf_params) {
  140. dev_dbg(dev, "pinconf_num_params or pinconf_params missing\n");
  141. return -ENOSYS;
  142. }
  143. p = ops->pinconf_params;
  144. end = p + ops->pinconf_num_params;
  145. /* See if this pctldev supports this parameter */
  146. for (; p < end; p++) {
  147. if (!strcmp(property, p->property)) {
  148. *default_value = p->default_value;
  149. return p->param;
  150. }
  151. }
  152. return -ENOSYS;
  153. }
  154. /**
  155. * pinconf_enable_setting() - apply pin configuration for a certain pin/group
  156. *
  157. * @dev: pin controller device
  158. * @is_group: target of operation (true: pin group, false: pin)
  159. * @selector: pin selector or group selector, depending on @is_group
  160. * @param: configuration paramter
  161. * @argument: argument taken by some configuration parameters
  162. * @return: 0 on success, or negative error code on failure
  163. */
  164. static int pinconf_enable_setting(struct udevice *dev, bool is_group,
  165. unsigned selector, unsigned param,
  166. u32 argument)
  167. {
  168. const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
  169. if (is_group) {
  170. if (!ops->pinconf_group_set) {
  171. dev_dbg(dev, "pinconf_group_set op missing\n");
  172. return -ENOSYS;
  173. }
  174. return ops->pinconf_group_set(dev, selector, param,
  175. argument);
  176. } else {
  177. if (!ops->pinconf_set) {
  178. dev_dbg(dev, "pinconf_set op missing\n");
  179. return -ENOSYS;
  180. }
  181. return ops->pinconf_set(dev, selector, param, argument);
  182. }
  183. }
  184. #else
  185. static int pinconf_prop_name_to_param(struct udevice *dev,
  186. const char *property, u32 *default_value)
  187. {
  188. return -ENOSYS;
  189. }
  190. static int pinconf_enable_setting(struct udevice *dev, bool is_group,
  191. unsigned selector, unsigned param,
  192. u32 argument)
  193. {
  194. return 0;
  195. }
  196. #endif
  197. /**
  198. * pinctrl_generic_set_state_one() - set state for a certain pin/group
  199. * Apply all pin multiplexing and pin configurations specified by @config
  200. * for a given pin or pin group.
  201. *
  202. * @dev: pin controller device
  203. * @config: pseudo device pointing to config node
  204. * @is_group: target of operation (true: pin group, false: pin)
  205. * @selector: pin selector or group selector, depending on @is_group
  206. * @return: 0 on success, or negative error code on failure
  207. */
  208. static int pinctrl_generic_set_state_one(struct udevice *dev,
  209. struct udevice *config,
  210. bool is_group, unsigned selector)
  211. {
  212. const char *propname;
  213. const void *value;
  214. struct ofprop property;
  215. int len, func_selector, param, ret;
  216. u32 arg, default_val;
  217. dev_for_each_property(property, config) {
  218. value = dev_read_prop_by_prop(&property, &propname, &len);
  219. if (!value)
  220. return -EINVAL;
  221. if (!strcmp(propname, "function")) {
  222. func_selector = pinmux_func_name_to_selector(dev,
  223. value);
  224. if (func_selector < 0)
  225. return func_selector;
  226. ret = pinmux_enable_setting(dev, is_group,
  227. selector,
  228. func_selector);
  229. } else {
  230. param = pinconf_prop_name_to_param(dev, propname,
  231. &default_val);
  232. if (param < 0)
  233. continue; /* just skip unknown properties */
  234. if (len >= sizeof(fdt32_t))
  235. arg = fdt32_to_cpu(*(fdt32_t *)value);
  236. else
  237. arg = default_val;
  238. ret = pinconf_enable_setting(dev, is_group,
  239. selector, param, arg);
  240. }
  241. if (ret)
  242. return ret;
  243. }
  244. return 0;
  245. }
  246. /**
  247. * pinctrl_generic_set_state_subnode() - apply all settings in config node
  248. *
  249. * @dev: pin controller device
  250. * @config: pseudo device pointing to config node
  251. * @return: 0 on success, or negative error code on failure
  252. */
  253. static int pinctrl_generic_set_state_subnode(struct udevice *dev,
  254. struct udevice *config)
  255. {
  256. const char *subnode_target_type = "pins";
  257. bool is_group = false;
  258. const char *name;
  259. int strings_count, selector, i, ret;
  260. strings_count = dev_read_string_count(config, subnode_target_type);
  261. if (strings_count < 0) {
  262. subnode_target_type = "groups";
  263. is_group = true;
  264. strings_count = dev_read_string_count(config,
  265. subnode_target_type);
  266. if (strings_count < 0) {
  267. /* skip this node; may contain config child nodes */
  268. return 0;
  269. }
  270. }
  271. for (i = 0; i < strings_count; i++) {
  272. ret = dev_read_string_index(config, subnode_target_type, i,
  273. &name);
  274. if (ret)
  275. return ret;
  276. if (is_group)
  277. selector = pinctrl_group_name_to_selector(dev, name);
  278. else
  279. selector = pinctrl_pin_name_to_selector(dev, name);
  280. if (selector < 0)
  281. return selector;
  282. ret = pinctrl_generic_set_state_one(dev, config,
  283. is_group, selector);
  284. if (ret)
  285. return ret;
  286. }
  287. return 0;
  288. }
  289. int pinctrl_generic_set_state(struct udevice *dev, struct udevice *config)
  290. {
  291. struct udevice *child;
  292. int ret;
  293. ret = pinctrl_generic_set_state_subnode(dev, config);
  294. if (ret)
  295. return ret;
  296. for (device_find_first_child(config, &child);
  297. child;
  298. device_find_next_child(&child)) {
  299. ret = pinctrl_generic_set_state_subnode(dev, child);
  300. if (ret)
  301. return ret;
  302. }
  303. return 0;
  304. }