summaryrefslogtreecommitdiff
path: root/drivers/pinctrl/pinctrl-generic.c
blob: 3629322dbb380ad9867dfcd855ef22eb55556d24 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
/*
 * Copyright (C) 2015  Masahiro Yamada <yamada.masahiro@socionext.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <linux/compat.h>
#include <dm/device.h>
#include <dm/pinctrl.h>

DECLARE_GLOBAL_DATA_PTR;

/**
 * pinctrl_pin_name_to_selector() - return the pin selector for a pin
 *
 * @dev: pin controller device
 * @pin: the pin name to look up
 * @return: pin selector, or negative error code on failure
 */
static int pinctrl_pin_name_to_selector(struct udevice *dev, const char *pin)
{
	const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
	unsigned npins, selector;

	if (!ops->get_pins_count || !ops->get_pin_name) {
		dev_dbg(dev, "get_pins_count or get_pin_name missing\n");
		return -ENOSYS;
	}

	npins = ops->get_pins_count(dev);

	/* See if this pctldev has this pin */
	for (selector = 0; selector < npins; selector++) {
		const char *pname = ops->get_pin_name(dev, selector);

		if (!strcmp(pin, pname))
			return selector;
	}

	return -ENOSYS;
}

/**
 * pinctrl_group_name_to_selector() - return the group selector for a group
 *
 * @dev: pin controller device
 * @group: the pin group name to look up
 * @return: pin group selector, or negative error code on failure
 */
static int pinctrl_group_name_to_selector(struct udevice *dev,
					  const char *group)
{
	const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
	unsigned ngroups, selector;

	if (!ops->get_groups_count || !ops->get_group_name) {
		dev_dbg(dev, "get_groups_count or get_group_name missing\n");
		return -ENOSYS;
	}

	ngroups = ops->get_groups_count(dev);

	/* See if this pctldev has this group */
	for (selector = 0; selector < ngroups; selector++) {
		const char *gname = ops->get_group_name(dev, selector);

		if (!strcmp(group, gname))
			return selector;
	}

	return -ENOSYS;
}

#if CONFIG_IS_ENABLED(PINMUX)
/**
 * pinmux_func_name_to_selector() - return the function selector for a function
 *
 * @dev: pin controller device
 * @function: the function name to look up
 * @return: function selector, or negative error code on failure
 */
static int pinmux_func_name_to_selector(struct udevice *dev,
					const char *function)
{
	const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
	unsigned nfuncs, selector = 0;

	if (!ops->get_functions_count || !ops->get_function_name) {
		dev_dbg(dev,
			"get_functions_count or get_function_name missing\n");
		return -ENOSYS;
	}

	nfuncs = ops->get_functions_count(dev);

	/* See if this pctldev has this function */
	for (selector = 0; selector < nfuncs; selector++) {
		const char *fname = ops->get_function_name(dev, selector);

		if (!strcmp(function, fname))
			return selector;
	}

	return -ENOSYS;
}

/**
 * pinmux_enable_setting() - enable pin-mux setting for a certain pin/group
 *
 * @dev: pin controller device
 * @is_group: target of operation (true: pin group, false: pin)
 * @selector: pin selector or group selector, depending on @is_group
 * @func_selector: function selector
 * @return: 0 on success, or negative error code on failure
 */
static int pinmux_enable_setting(struct udevice *dev, bool is_group,
				 unsigned selector, unsigned func_selector)
{
	const struct pinctrl_ops *ops = pinctrl_get_ops(dev);

	if (is_group) {
		if (!ops->pinmux_group_set) {
			dev_dbg(dev, "pinmux_group_set op missing\n");
			return -ENOSYS;
		}

		return ops->pinmux_group_set(dev, selector, func_selector);
	} else {
		if (!ops->pinmux_set) {
			dev_dbg(dev, "pinmux_set op missing\n");
			return -ENOSYS;
		}
		return ops->pinmux_set(dev, selector, func_selector);
	}
}
#else
static int pinmux_func_name_to_selector(struct udevice *dev,
					const char *function)
{
	return 0;
}

static int pinmux_enable_setting(struct udevice *dev, bool is_group,
				 unsigned selector, unsigned func_selector)
{
	return 0;
}
#endif

#if CONFIG_IS_ENABLED(PINCONF)
/**
 * pinconf_prop_name_to_param() - return parameter ID for a property name
 *
 * @dev: pin controller device
 * @property: property name in DTS, such as "bias-pull-up", "slew-rate", etc.
 * @default_value: return default value in case no value is specified in DTS
 * @return: return pamater ID, or negative error code on failure
 */
static int pinconf_prop_name_to_param(struct udevice *dev,
				      const char *property, u32 *default_value)
{
	const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
	const struct pinconf_param *p, *end;

	if (!ops->pinconf_num_params || !ops->pinconf_params) {
		dev_dbg(dev, "pinconf_num_params or pinconf_params missing\n");
		return -ENOSYS;
	}

	p = ops->pinconf_params;
	end = p + ops->pinconf_num_params;

	/* See if this pctldev supports this parameter */
	for (; p < end; p++) {
		if (!strcmp(property, p->property)) {
			*default_value = p->default_value;
			return p->param;
		}
	}

	return -ENOSYS;
}

/**
 * pinconf_enable_setting() - apply pin configuration for a certain pin/group
 *
 * @dev: pin controller device
 * @is_group: target of operation (true: pin group, false: pin)
 * @selector: pin selector or group selector, depending on @is_group
 * @param: configuration paramter
 * @argument: argument taken by some configuration parameters
 * @return: 0 on success, or negative error code on failure
 */
static int pinconf_enable_setting(struct udevice *dev, bool is_group,
				  unsigned selector, unsigned param,
				  u32 argument)
{
	const struct pinctrl_ops *ops = pinctrl_get_ops(dev);

	if (is_group) {
		if (!ops->pinconf_group_set) {
			dev_dbg(dev, "pinconf_group_set op missing\n");
			return -ENOSYS;
		}

		return ops->pinconf_group_set(dev, selector, param,
					      argument);
	} else {
		if (!ops->pinconf_set) {
			dev_dbg(dev, "pinconf_set op missing\n");
			return -ENOSYS;
		}
		return ops->pinconf_set(dev, selector, param, argument);
	}
}
#else
static int pinconf_prop_name_to_param(struct udevice *dev,
				      const char *property, u32 *default_value)
{
	return -ENOSYS;
}

static int pinconf_enable_setting(struct udevice *dev, bool is_group,
				  unsigned selector, unsigned param,
				  u32 argument)
{
	return 0;
}
#endif

/**
 * pinctrl_generic_set_state_one() - set state for a certain pin/group
 * Apply all pin multiplexing and pin configurations specified by @config
 * for a given pin or pin group.
 *
 * @dev: pin controller device
 * @config: pseudo device pointing to config node
 * @is_group: target of operation (true: pin group, false: pin)
 * @selector: pin selector or group selector, depending on @is_group
 * @return: 0 on success, or negative error code on failure
 */
static int pinctrl_generic_set_state_one(struct udevice *dev,
					 struct udevice *config,
					 bool is_group, unsigned selector)
{
	const void *fdt = gd->fdt_blob;
	int node_offset = config->of_offset;
	const char *propname;
	const void *value;
	int prop_offset, len, func_selector, param, ret;
	u32 arg, default_val;

	for (prop_offset = fdt_first_property_offset(fdt, node_offset);
	     prop_offset > 0;
	     prop_offset = fdt_next_property_offset(fdt, prop_offset)) {
		value = fdt_getprop_by_offset(fdt, prop_offset,
					      &propname, &len);
		if (!value)
			return -EINVAL;

		if (!strcmp(propname, "function")) {
			func_selector = pinmux_func_name_to_selector(dev,
								     value);
			if (func_selector < 0)
				return func_selector;
			ret = pinmux_enable_setting(dev, is_group,
						    selector,
						    func_selector);
		} else {
			param = pinconf_prop_name_to_param(dev, propname,
							   &default_val);
			if (param < 0)
				continue; /* just skip unknown properties */

			if (len >= sizeof(fdt32_t))
				arg = fdt32_to_cpu(*(fdt32_t *)value);
			else
				arg = default_val;

			ret = pinconf_enable_setting(dev, is_group,
						     selector, param, arg);
		}

		if (ret)
			return ret;
	}

	return 0;
}

/**
 * pinctrl_generic_set_state_subnode() - apply all settings in config node
 *
 * @dev: pin controller device
 * @config: pseudo device pointing to config node
 * @return: 0 on success, or negative error code on failure
 */
static int pinctrl_generic_set_state_subnode(struct udevice *dev,
					     struct udevice *config)
{
	const void *fdt = gd->fdt_blob;
	int node = config->of_offset;
	const char *subnode_target_type = "pins";
	bool is_group = false;
	const char *name;
	int strings_count, selector, i, ret;

	strings_count = fdt_stringlist_count(fdt, node, subnode_target_type);
	if (strings_count < 0) {
		subnode_target_type = "groups";
		is_group = true;
		strings_count = fdt_stringlist_count(fdt, node,
						     subnode_target_type);
		if (strings_count < 0) {
			/* skip this node; may contain config child nodes */
			return 0;
		}
	}

	for (i = 0; i < strings_count; i++) {
		name = fdt_stringlist_get(fdt, node, subnode_target_type, i,
					  NULL);
		if (!name)
			return -EINVAL;

		if (is_group)
			selector = pinctrl_group_name_to_selector(dev, name);
		else
			selector = pinctrl_pin_name_to_selector(dev, name);
		if (selector < 0)
			return selector;

		ret = pinctrl_generic_set_state_one(dev, config,
						    is_group, selector);
		if (ret)
			return ret;
	}

	return 0;
}

int pinctrl_generic_set_state(struct udevice *dev, struct udevice *config)
{
	struct udevice *child;
	int ret;

	ret = pinctrl_generic_set_state_subnode(dev, config);
	if (ret)
		return ret;

	for (device_find_first_child(config, &child);
	     child;
	     device_find_next_child(&child)) {
		ret = pinctrl_generic_set_state_subnode(dev, child);
		if (ret)
			return ret;
	}

	return 0;
}