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Masahiro Yamadad90a5a32015-08-27 12:44:29 +09001/*
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
12DECLARE_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 */
21static 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 */
51static 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 */
83static 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 */
117static 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
138static int pinmux_func_name_to_selector(struct udevice *dev,
139 const char *function)
140{
141 return 0;
142}
143
144static 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 */
160static 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 */
195static 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
218static int pinconf_prop_name_to_param(struct udevice *dev,
219 const char *property, u32 *default_value)
220{
221 return -ENOSYS;
222}
223
224static 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 */
243static 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 */
299static 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);
Beniamino Galvani2c936372016-08-16 11:49:47 +0200315 if (strings_count < 0) {
316 /* skip this node; may contain config child nodes */
317 return 0;
318 }
Masahiro Yamadad90a5a32015-08-27 12:44:29 +0900319 }
320
321 for (i = 0; i < strings_count; i++) {
322 ret = fdt_get_string_index(fdt, node, subnode_target_type,
323 i, &name);
324 if (ret < 0)
325 return -EINVAL;
326
327 if (is_group)
328 selector = pinctrl_group_name_to_selector(dev, name);
329 else
330 selector = pinctrl_pin_name_to_selector(dev, name);
331 if (selector < 0)
332 return selector;
333
334 ret = pinctrl_generic_set_state_one(dev, config,
335 is_group, selector);
336 if (ret)
337 return ret;
338 }
339
340 return 0;
341}
342
343int pinctrl_generic_set_state(struct udevice *dev, struct udevice *config)
344{
345 struct udevice *child;
346 int ret;
347
348 ret = pinctrl_generic_set_state_subnode(dev, config);
349 if (ret)
350 return ret;
351
352 for (device_find_first_child(config, &child);
353 child;
354 device_find_next_child(&child)) {
355 ret = pinctrl_generic_set_state_subnode(dev, child);
356 if (ret)
357 return ret;
358 }
359
360 return 0;
361}