]>
Commit | Line | Data |
---|---|---|
d90a5a30 MY |
1 | /* |
2 | * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com> | |
3 | * | |
4 | * SPDX-License-Identifier: GPL-2.0+ | |
5 | */ | |
6 | ||
7 | #include <common.h> | |
8 | #include <linux/compat.h> | |
9 | #include <dm/device.h> | |
10 | #include <dm/pinctrl.h> | |
11 | ||
12 | DECLARE_GLOBAL_DATA_PTR; | |
13 | ||
14 | /** | |
15 | * pinctrl_pin_name_to_selector() - return the pin selector for a pin | |
16 | * | |
17 | * @dev: pin controller device | |
18 | * @pin: the pin name to look up | |
19 | * @return: pin selector, or negative error code on failure | |
20 | */ | |
21 | static int pinctrl_pin_name_to_selector(struct udevice *dev, const char *pin) | |
22 | { | |
23 | const struct pinctrl_ops *ops = pinctrl_get_ops(dev); | |
24 | unsigned npins, selector; | |
25 | ||
26 | if (!ops->get_pins_count || !ops->get_pin_name) { | |
27 | dev_dbg(dev, "get_pins_count or get_pin_name missing\n"); | |
28 | return -ENOSYS; | |
29 | } | |
30 | ||
31 | npins = ops->get_pins_count(dev); | |
32 | ||
33 | /* See if this pctldev has this pin */ | |
34 | for (selector = 0; selector < npins; selector++) { | |
35 | const char *pname = ops->get_pin_name(dev, selector); | |
36 | ||
37 | if (!strcmp(pin, pname)) | |
38 | return selector; | |
39 | } | |
40 | ||
41 | return -ENOSYS; | |
42 | } | |
43 | ||
44 | /** | |
45 | * pinctrl_group_name_to_selector() - return the group selector for a group | |
46 | * | |
47 | * @dev: pin controller device | |
48 | * @group: the pin group name to look up | |
49 | * @return: pin group selector, or negative error code on failure | |
50 | */ | |
51 | static int pinctrl_group_name_to_selector(struct udevice *dev, | |
52 | const char *group) | |
53 | { | |
54 | const struct pinctrl_ops *ops = pinctrl_get_ops(dev); | |
55 | unsigned ngroups, selector; | |
56 | ||
57 | if (!ops->get_groups_count || !ops->get_group_name) { | |
58 | dev_dbg(dev, "get_groups_count or get_group_name missing\n"); | |
59 | return -ENOSYS; | |
60 | } | |
61 | ||
62 | ngroups = ops->get_groups_count(dev); | |
63 | ||
64 | /* See if this pctldev has this group */ | |
65 | for (selector = 0; selector < ngroups; selector++) { | |
66 | const char *gname = ops->get_group_name(dev, selector); | |
67 | ||
68 | if (!strcmp(group, gname)) | |
69 | return selector; | |
70 | } | |
71 | ||
72 | return -ENOSYS; | |
73 | } | |
74 | ||
75 | #if CONFIG_IS_ENABLED(PINMUX) | |
76 | /** | |
77 | * pinmux_func_name_to_selector() - return the function selector for a function | |
78 | * | |
79 | * @dev: pin controller device | |
80 | * @function: the function name to look up | |
81 | * @return: function selector, or negative error code on failure | |
82 | */ | |
83 | static int pinmux_func_name_to_selector(struct udevice *dev, | |
84 | const char *function) | |
85 | { | |
86 | const struct pinctrl_ops *ops = pinctrl_get_ops(dev); | |
87 | unsigned nfuncs, selector = 0; | |
88 | ||
89 | if (!ops->get_functions_count || !ops->get_function_name) { | |
90 | dev_dbg(dev, | |
91 | "get_functions_count or get_function_name missing\n"); | |
92 | return -ENOSYS; | |
93 | } | |
94 | ||
95 | nfuncs = ops->get_functions_count(dev); | |
96 | ||
97 | /* See if this pctldev has this function */ | |
98 | for (selector = 0; selector < nfuncs; selector++) { | |
99 | const char *fname = ops->get_function_name(dev, selector); | |
100 | ||
101 | if (!strcmp(function, fname)) | |
102 | return selector; | |
103 | } | |
104 | ||
105 | return -ENOSYS; | |
106 | } | |
107 | ||
108 | /** | |
109 | * pinmux_enable_setting() - enable pin-mux setting for a certain pin/group | |
110 | * | |
111 | * @dev: pin controller device | |
112 | * @is_group: target of operation (true: pin group, false: pin) | |
113 | * @selector: pin selector or group selector, depending on @is_group | |
114 | * @func_selector: function selector | |
115 | * @return: 0 on success, or negative error code on failure | |
116 | */ | |
117 | static int pinmux_enable_setting(struct udevice *dev, bool is_group, | |
118 | unsigned selector, unsigned func_selector) | |
119 | { | |
120 | const struct pinctrl_ops *ops = pinctrl_get_ops(dev); | |
121 | ||
122 | if (is_group) { | |
123 | if (!ops->pinmux_group_set) { | |
124 | dev_dbg(dev, "pinmux_group_set op missing\n"); | |
125 | return -ENOSYS; | |
126 | } | |
127 | ||
128 | return ops->pinmux_group_set(dev, selector, func_selector); | |
129 | } else { | |
130 | if (!ops->pinmux_set) { | |
131 | dev_dbg(dev, "pinmux_set op missing\n"); | |
132 | return -ENOSYS; | |
133 | } | |
134 | return ops->pinmux_set(dev, selector, func_selector); | |
135 | } | |
136 | } | |
137 | #else | |
138 | static int pinmux_func_name_to_selector(struct udevice *dev, | |
139 | const char *function) | |
140 | { | |
141 | return 0; | |
142 | } | |
143 | ||
144 | static int pinmux_enable_setting(struct udevice *dev, bool is_group, | |
145 | unsigned selector, unsigned func_selector) | |
146 | { | |
147 | return 0; | |
148 | } | |
149 | #endif | |
150 | ||
151 | #if CONFIG_IS_ENABLED(PINCONF) | |
152 | /** | |
153 | * pinconf_prop_name_to_param() - return parameter ID for a property name | |
154 | * | |
155 | * @dev: pin controller device | |
156 | * @property: property name in DTS, such as "bias-pull-up", "slew-rate", etc. | |
157 | * @default_value: return default value in case no value is specified in DTS | |
158 | * @return: return pamater ID, or negative error code on failure | |
159 | */ | |
160 | static int pinconf_prop_name_to_param(struct udevice *dev, | |
161 | const char *property, u32 *default_value) | |
162 | { | |
163 | const struct pinctrl_ops *ops = pinctrl_get_ops(dev); | |
164 | const struct pinconf_param *p, *end; | |
165 | ||
166 | if (!ops->pinconf_num_params || !ops->pinconf_params) { | |
167 | dev_dbg(dev, "pinconf_num_params or pinconf_params missing\n"); | |
168 | return -ENOSYS; | |
169 | } | |
170 | ||
171 | p = ops->pinconf_params; | |
172 | end = p + ops->pinconf_num_params; | |
173 | ||
174 | /* See if this pctldev supports this parameter */ | |
175 | for (; p < end; p++) { | |
176 | if (!strcmp(property, p->property)) { | |
177 | *default_value = p->default_value; | |
178 | return p->param; | |
179 | } | |
180 | } | |
181 | ||
182 | return -ENOSYS; | |
183 | } | |
184 | ||
185 | /** | |
186 | * pinconf_enable_setting() - apply pin configuration for a certain pin/group | |
187 | * | |
188 | * @dev: pin controller device | |
189 | * @is_group: target of operation (true: pin group, false: pin) | |
190 | * @selector: pin selector or group selector, depending on @is_group | |
191 | * @param: configuration paramter | |
192 | * @argument: argument taken by some configuration parameters | |
193 | * @return: 0 on success, or negative error code on failure | |
194 | */ | |
195 | static int pinconf_enable_setting(struct udevice *dev, bool is_group, | |
196 | unsigned selector, unsigned param, | |
197 | u32 argument) | |
198 | { | |
199 | const struct pinctrl_ops *ops = pinctrl_get_ops(dev); | |
200 | ||
201 | if (is_group) { | |
202 | if (!ops->pinconf_group_set) { | |
203 | dev_dbg(dev, "pinconf_group_set op missing\n"); | |
204 | return -ENOSYS; | |
205 | } | |
206 | ||
207 | return ops->pinconf_group_set(dev, selector, param, | |
208 | argument); | |
209 | } else { | |
210 | if (!ops->pinconf_set) { | |
211 | dev_dbg(dev, "pinconf_set op missing\n"); | |
212 | return -ENOSYS; | |
213 | } | |
214 | return ops->pinconf_set(dev, selector, param, argument); | |
215 | } | |
216 | } | |
217 | #else | |
218 | static int pinconf_prop_name_to_param(struct udevice *dev, | |
219 | const char *property, u32 *default_value) | |
220 | { | |
221 | return -ENOSYS; | |
222 | } | |
223 | ||
224 | static int pinconf_enable_setting(struct udevice *dev, bool is_group, | |
225 | unsigned selector, unsigned param, | |
226 | u32 argument) | |
227 | { | |
228 | return 0; | |
229 | } | |
230 | #endif | |
231 | ||
232 | /** | |
233 | * pinctrl_generic_set_state_one() - set state for a certain pin/group | |
234 | * Apply all pin multiplexing and pin configurations specified by @config | |
235 | * for a given pin or pin group. | |
236 | * | |
237 | * @dev: pin controller device | |
238 | * @config: pseudo device pointing to config node | |
239 | * @is_group: target of operation (true: pin group, false: pin) | |
240 | * @selector: pin selector or group selector, depending on @is_group | |
241 | * @return: 0 on success, or negative error code on failure | |
242 | */ | |
243 | static int pinctrl_generic_set_state_one(struct udevice *dev, | |
244 | struct udevice *config, | |
245 | bool is_group, unsigned selector) | |
246 | { | |
247 | const void *fdt = gd->fdt_blob; | |
248 | int node_offset = config->of_offset; | |
249 | const char *propname; | |
250 | const void *value; | |
251 | int prop_offset, len, func_selector, param, ret; | |
252 | u32 arg, default_val; | |
253 | ||
254 | for (prop_offset = fdt_first_property_offset(fdt, node_offset); | |
255 | prop_offset > 0; | |
256 | prop_offset = fdt_next_property_offset(fdt, prop_offset)) { | |
257 | value = fdt_getprop_by_offset(fdt, prop_offset, | |
258 | &propname, &len); | |
259 | if (!value) | |
260 | return -EINVAL; | |
261 | ||
262 | if (!strcmp(propname, "function")) { | |
263 | func_selector = pinmux_func_name_to_selector(dev, | |
264 | value); | |
265 | if (func_selector < 0) | |
266 | return func_selector; | |
267 | ret = pinmux_enable_setting(dev, is_group, | |
268 | selector, | |
269 | func_selector); | |
270 | } else { | |
271 | param = pinconf_prop_name_to_param(dev, propname, | |
272 | &default_val); | |
273 | if (param < 0) | |
274 | continue; /* just skip unknown properties */ | |
275 | ||
276 | if (len >= sizeof(fdt32_t)) | |
277 | arg = fdt32_to_cpu(*(fdt32_t *)value); | |
278 | else | |
279 | arg = default_val; | |
280 | ||
281 | ret = pinconf_enable_setting(dev, is_group, | |
282 | selector, param, arg); | |
283 | } | |
284 | ||
285 | if (ret) | |
286 | return ret; | |
287 | } | |
288 | ||
289 | return 0; | |
290 | } | |
291 | ||
292 | /** | |
293 | * pinctrl_generic_set_state_subnode() - apply all settings in config node | |
294 | * | |
295 | * @dev: pin controller device | |
296 | * @config: pseudo device pointing to config node | |
297 | * @return: 0 on success, or negative error code on failure | |
298 | */ | |
299 | static int pinctrl_generic_set_state_subnode(struct udevice *dev, | |
300 | struct udevice *config) | |
301 | { | |
302 | const void *fdt = gd->fdt_blob; | |
303 | int node = config->of_offset; | |
304 | const char *subnode_target_type = "pins"; | |
305 | bool is_group = false; | |
306 | const char *name; | |
307 | int strings_count, selector, i, ret; | |
308 | ||
309 | strings_count = fdt_count_strings(fdt, node, subnode_target_type); | |
310 | if (strings_count < 0) { | |
311 | subnode_target_type = "groups"; | |
312 | is_group = true; | |
313 | strings_count = fdt_count_strings(fdt, node, | |
314 | subnode_target_type); | |
315 | if (strings_count < 0) | |
316 | return -EINVAL; | |
317 | } | |
318 | ||
319 | for (i = 0; i < strings_count; i++) { | |
320 | ret = fdt_get_string_index(fdt, node, subnode_target_type, | |
321 | i, &name); | |
322 | if (ret < 0) | |
323 | return -EINVAL; | |
324 | ||
325 | if (is_group) | |
326 | selector = pinctrl_group_name_to_selector(dev, name); | |
327 | else | |
328 | selector = pinctrl_pin_name_to_selector(dev, name); | |
329 | if (selector < 0) | |
330 | return selector; | |
331 | ||
332 | ret = pinctrl_generic_set_state_one(dev, config, | |
333 | is_group, selector); | |
334 | if (ret) | |
335 | return ret; | |
336 | } | |
337 | ||
338 | return 0; | |
339 | } | |
340 | ||
341 | int pinctrl_generic_set_state(struct udevice *dev, struct udevice *config) | |
342 | { | |
343 | struct udevice *child; | |
344 | int ret; | |
345 | ||
346 | ret = pinctrl_generic_set_state_subnode(dev, config); | |
347 | if (ret) | |
348 | return ret; | |
349 | ||
350 | for (device_find_first_child(config, &child); | |
351 | child; | |
352 | device_find_next_child(&child)) { | |
353 | ret = pinctrl_generic_set_state_subnode(dev, child); | |
354 | if (ret) | |
355 | return ret; | |
356 | } | |
357 | ||
358 | return 0; | |
359 | } |