summaryrefslogtreecommitdiff
path: root/drivers/pinctrl/berlin/berlin.c
blob: c372a2a24be4bb80b1f2475ef8512171c8e1326f (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Marvell Berlin SoC pinctrl core driver
 *
 * Copyright (C) 2014 Marvell Technology Group Ltd.
 *
 * Antoine Ténart <antoine.tenart@free-electrons.com>
 */

#include <linux/io.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>

#include "../core.h"
#include "../pinctrl-utils.h"
#include "berlin.h"

struct berlin_pinctrl {
	struct regmap *regmap;
	struct device *dev;
	const struct berlin_pinctrl_desc *desc;
	struct pinfunction *functions;
	unsigned nfunctions;
	struct pinctrl_dev *pctrl_dev;
};

static int berlin_pinctrl_get_group_count(struct pinctrl_dev *pctrl_dev)
{
	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);

	return pctrl->desc->ngroups;
}

static const char *berlin_pinctrl_get_group_name(struct pinctrl_dev *pctrl_dev,
						 unsigned group)
{
	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);

	return pctrl->desc->groups[group].name;
}

static int berlin_pinctrl_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
					 struct device_node *node,
					 struct pinctrl_map **map,
					 unsigned *num_maps)
{
	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
	struct property *prop;
	const char *function_name, *group_name;
	unsigned reserved_maps = 0;
	int ret, ngroups;

	*map = NULL;
	*num_maps = 0;

	ret = of_property_read_string(node, "function", &function_name);
	if (ret) {
		dev_err(pctrl->dev,
			"missing function property in node %pOFn\n", node);
		return -EINVAL;
	}

	ngroups = of_property_count_strings(node, "groups");
	if (ngroups < 0) {
		dev_err(pctrl->dev,
			"missing groups property in node %pOFn\n", node);
		return -EINVAL;
	}

	ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
					num_maps, ngroups);
	if (ret) {
		dev_err(pctrl->dev, "can't reserve map: %d\n", ret);
		return ret;
	}

	of_property_for_each_string(node, "groups", prop, group_name) {
		ret = pinctrl_utils_add_map_mux(pctrl_dev, map, &reserved_maps,
						num_maps, group_name,
						function_name);
		if (ret) {
			dev_err(pctrl->dev, "can't add map: %d\n", ret);
			return ret;
		}
	}

	return 0;
}

static const struct pinctrl_ops berlin_pinctrl_ops = {
	.get_groups_count	= berlin_pinctrl_get_group_count,
	.get_group_name		= berlin_pinctrl_get_group_name,
	.dt_node_to_map		= berlin_pinctrl_dt_node_to_map,
	.dt_free_map		= pinctrl_utils_free_map,
};

static int berlin_pinmux_get_functions_count(struct pinctrl_dev *pctrl_dev)
{
	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);

	return pctrl->nfunctions;
}

static const char *berlin_pinmux_get_function_name(struct pinctrl_dev *pctrl_dev,
						   unsigned function)
{
	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);

	return pctrl->functions[function].name;
}

static int berlin_pinmux_get_function_groups(struct pinctrl_dev *pctrl_dev,
					     unsigned function,
					     const char * const **groups,
					     unsigned * const ngroups)
{
	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);

	*groups = pctrl->functions[function].groups;
	*ngroups = pctrl->functions[function].ngroups;

	return 0;
}

static struct berlin_desc_function *
berlin_pinctrl_find_function_by_name(struct berlin_pinctrl *pctrl,
				     const struct berlin_desc_group *group,
				     const char *fname)
{
	struct berlin_desc_function *function = group->functions;

	while (function->name) {
		if (!strcmp(function->name, fname))
			return function;

		function++;
	}

	return NULL;
}

static int berlin_pinmux_set(struct pinctrl_dev *pctrl_dev,
			     unsigned function,
			     unsigned group)
{
	struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
	const struct berlin_desc_group *group_desc = pctrl->desc->groups + group;
	struct pinfunction *func = pctrl->functions + function;
	struct berlin_desc_function *function_desc =
		berlin_pinctrl_find_function_by_name(pctrl, group_desc,
						     func->name);
	u32 mask, val;

	if (!function_desc)
		return -EINVAL;

	mask = GENMASK(group_desc->lsb + group_desc->bit_width - 1,
		       group_desc->lsb);
	val = function_desc->muxval << group_desc->lsb;
	regmap_update_bits(pctrl->regmap, group_desc->offset, mask, val);

	return 0;
}

static const struct pinmux_ops berlin_pinmux_ops = {
	.get_functions_count	= &berlin_pinmux_get_functions_count,
	.get_function_name	= &berlin_pinmux_get_function_name,
	.get_function_groups	= &berlin_pinmux_get_function_groups,
	.set_mux		= &berlin_pinmux_set,
};

static int berlin_pinctrl_add_function(struct berlin_pinctrl *pctrl,
				       const char *name)
{
	struct pinfunction *function = pctrl->functions;

	while (function->name) {
		if (!strcmp(function->name, name)) {
			function->ngroups++;
			return -EEXIST;
		}
		function++;
	}

	function->name = name;
	function->ngroups = 1;

	pctrl->nfunctions++;

	return 0;
}

static int berlin_pinctrl_build_state(struct platform_device *pdev)
{
	struct berlin_pinctrl *pctrl = platform_get_drvdata(pdev);
	const struct berlin_desc_group *desc_group;
	const struct berlin_desc_function *desc_function;
	int i, max_functions = 0;

	pctrl->nfunctions = 0;

	for (i = 0; i < pctrl->desc->ngroups; i++) {
		desc_group = pctrl->desc->groups + i;
		/* compute the maximum number of functions a group can have */
		max_functions += 1 << (desc_group->bit_width + 1);
	}

	/* we will reallocate later */
	pctrl->functions = kcalloc(max_functions, sizeof(*pctrl->functions), GFP_KERNEL);
	if (!pctrl->functions)
		return -ENOMEM;

	/* register all functions */
	for (i = 0; i < pctrl->desc->ngroups; i++) {
		desc_group = pctrl->desc->groups + i;
		desc_function = desc_group->functions;

		while (desc_function->name) {
			berlin_pinctrl_add_function(pctrl, desc_function->name);
			desc_function++;
		}
	}

	pctrl->functions = krealloc(pctrl->functions,
				    pctrl->nfunctions * sizeof(*pctrl->functions),
				    GFP_KERNEL);
	if (!pctrl->functions)
		return -ENOMEM;

	/* map functions to theirs groups */
	for (i = 0; i < pctrl->desc->ngroups; i++) {
		desc_group = pctrl->desc->groups + i;
		desc_function = desc_group->functions;

		while (desc_function->name) {
			struct pinfunction *function = pctrl->functions;
			const char **groups;
			bool found = false;

			while (function->name) {
				if (!strcmp(desc_function->name, function->name)) {
					found = true;
					break;
				}
				function++;
			}

			if (!found) {
				kfree(pctrl->functions);
				return -EINVAL;
			}

			if (!function->groups) {
				function->groups =
					devm_kcalloc(&pdev->dev,
						     function->ngroups,
						     sizeof(*function->groups),
						     GFP_KERNEL);
				if (!function->groups) {
					kfree(pctrl->functions);
					return -ENOMEM;
				}
			}

			groups = (const char **)function->groups;
			while (*groups)
				groups++;

			*groups = desc_group->name;

			desc_function++;
		}
	}

	return 0;
}

static struct pinctrl_desc berlin_pctrl_desc = {
	.name		= "berlin-pinctrl",
	.pctlops	= &berlin_pinctrl_ops,
	.pmxops		= &berlin_pinmux_ops,
	.owner		= THIS_MODULE,
};

int berlin_pinctrl_probe_regmap(struct platform_device *pdev,
				const struct berlin_pinctrl_desc *desc,
				struct regmap *regmap)
{
	struct device *dev = &pdev->dev;
	struct berlin_pinctrl *pctrl;
	int ret;

	pctrl = devm_kzalloc(dev, sizeof(*pctrl), GFP_KERNEL);
	if (!pctrl)
		return -ENOMEM;

	platform_set_drvdata(pdev, pctrl);

	pctrl->regmap = regmap;
	pctrl->dev = &pdev->dev;
	pctrl->desc = desc;

	ret = berlin_pinctrl_build_state(pdev);
	if (ret) {
		dev_err(dev, "cannot build driver state: %d\n", ret);
		return ret;
	}

	pctrl->pctrl_dev = devm_pinctrl_register(dev, &berlin_pctrl_desc,
						 pctrl);
	if (IS_ERR(pctrl->pctrl_dev)) {
		dev_err(dev, "failed to register pinctrl driver\n");
		return PTR_ERR(pctrl->pctrl_dev);
	}

	return 0;
}

int berlin_pinctrl_probe(struct platform_device *pdev,
			 const struct berlin_pinctrl_desc *desc)
{
	struct device *dev = &pdev->dev;
	struct device_node *parent_np = of_get_parent(dev->of_node);
	struct regmap *regmap = syscon_node_to_regmap(parent_np);

	of_node_put(parent_np);
	if (IS_ERR(regmap))
		return PTR_ERR(regmap);

	return berlin_pinctrl_probe_regmap(pdev, desc, regmap);
}