GNU Linux-libre 5.13.14-gnu1
[releases.git] / drivers / pinctrl / berlin / berlin.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Marvell Berlin SoC pinctrl core driver
4  *
5  * Copyright (C) 2014 Marvell Technology Group Ltd.
6  *
7  * Antoine Ténart <antoine.tenart@free-electrons.com>
8  */
9
10 #include <linux/io.h>
11 #include <linux/mfd/syscon.h>
12 #include <linux/module.h>
13 #include <linux/of.h>
14 #include <linux/of_address.h>
15 #include <linux/of_device.h>
16 #include <linux/pinctrl/pinctrl.h>
17 #include <linux/pinctrl/pinmux.h>
18 #include <linux/platform_device.h>
19 #include <linux/regmap.h>
20 #include <linux/slab.h>
21
22 #include "../core.h"
23 #include "../pinctrl-utils.h"
24 #include "berlin.h"
25
26 struct berlin_pinctrl {
27         struct regmap *regmap;
28         struct device *dev;
29         const struct berlin_pinctrl_desc *desc;
30         struct berlin_pinctrl_function *functions;
31         unsigned nfunctions;
32         struct pinctrl_dev *pctrl_dev;
33 };
34
35 static int berlin_pinctrl_get_group_count(struct pinctrl_dev *pctrl_dev)
36 {
37         struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
38
39         return pctrl->desc->ngroups;
40 }
41
42 static const char *berlin_pinctrl_get_group_name(struct pinctrl_dev *pctrl_dev,
43                                                  unsigned group)
44 {
45         struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
46
47         return pctrl->desc->groups[group].name;
48 }
49
50 static int berlin_pinctrl_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
51                                          struct device_node *node,
52                                          struct pinctrl_map **map,
53                                          unsigned *num_maps)
54 {
55         struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
56         struct property *prop;
57         const char *function_name, *group_name;
58         unsigned reserved_maps = 0;
59         int ret, ngroups;
60
61         *map = NULL;
62         *num_maps = 0;
63
64         ret = of_property_read_string(node, "function", &function_name);
65         if (ret) {
66                 dev_err(pctrl->dev,
67                         "missing function property in node %pOFn\n", node);
68                 return -EINVAL;
69         }
70
71         ngroups = of_property_count_strings(node, "groups");
72         if (ngroups < 0) {
73                 dev_err(pctrl->dev,
74                         "missing groups property in node %pOFn\n", node);
75                 return -EINVAL;
76         }
77
78         ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
79                                         num_maps, ngroups);
80         if (ret) {
81                 dev_err(pctrl->dev, "can't reserve map: %d\n", ret);
82                 return ret;
83         }
84
85         of_property_for_each_string(node, "groups", prop, group_name) {
86                 ret = pinctrl_utils_add_map_mux(pctrl_dev, map, &reserved_maps,
87                                                 num_maps, group_name,
88                                                 function_name);
89                 if (ret) {
90                         dev_err(pctrl->dev, "can't add map: %d\n", ret);
91                         return ret;
92                 }
93         }
94
95         return 0;
96 }
97
98 static const struct pinctrl_ops berlin_pinctrl_ops = {
99         .get_groups_count       = &berlin_pinctrl_get_group_count,
100         .get_group_name         = &berlin_pinctrl_get_group_name,
101         .dt_node_to_map         = &berlin_pinctrl_dt_node_to_map,
102         .dt_free_map            = &pinctrl_utils_free_map,
103 };
104
105 static int berlin_pinmux_get_functions_count(struct pinctrl_dev *pctrl_dev)
106 {
107         struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
108
109         return pctrl->nfunctions;
110 }
111
112 static const char *berlin_pinmux_get_function_name(struct pinctrl_dev *pctrl_dev,
113                                                    unsigned function)
114 {
115         struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
116
117         return pctrl->functions[function].name;
118 }
119
120 static int berlin_pinmux_get_function_groups(struct pinctrl_dev *pctrl_dev,
121                                              unsigned function,
122                                              const char * const **groups,
123                                              unsigned * const num_groups)
124 {
125         struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
126
127         *groups = pctrl->functions[function].groups;
128         *num_groups = pctrl->functions[function].ngroups;
129
130         return 0;
131 }
132
133 static struct berlin_desc_function *
134 berlin_pinctrl_find_function_by_name(struct berlin_pinctrl *pctrl,
135                                      const struct berlin_desc_group *group,
136                                      const char *fname)
137 {
138         struct berlin_desc_function *function = group->functions;
139
140         while (function->name) {
141                 if (!strcmp(function->name, fname))
142                         return function;
143
144                 function++;
145         }
146
147         return NULL;
148 }
149
150 static int berlin_pinmux_set(struct pinctrl_dev *pctrl_dev,
151                              unsigned function,
152                              unsigned group)
153 {
154         struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
155         const struct berlin_desc_group *group_desc = pctrl->desc->groups + group;
156         struct berlin_pinctrl_function *func = pctrl->functions + function;
157         struct berlin_desc_function *function_desc =
158                 berlin_pinctrl_find_function_by_name(pctrl, group_desc,
159                                                      func->name);
160         u32 mask, val;
161
162         if (!function_desc)
163                 return -EINVAL;
164
165         mask = GENMASK(group_desc->lsb + group_desc->bit_width - 1,
166                        group_desc->lsb);
167         val = function_desc->muxval << group_desc->lsb;
168         regmap_update_bits(pctrl->regmap, group_desc->offset, mask, val);
169
170         return 0;
171 }
172
173 static const struct pinmux_ops berlin_pinmux_ops = {
174         .get_functions_count    = &berlin_pinmux_get_functions_count,
175         .get_function_name      = &berlin_pinmux_get_function_name,
176         .get_function_groups    = &berlin_pinmux_get_function_groups,
177         .set_mux                = &berlin_pinmux_set,
178 };
179
180 static int berlin_pinctrl_add_function(struct berlin_pinctrl *pctrl,
181                                        const char *name)
182 {
183         struct berlin_pinctrl_function *function = pctrl->functions;
184
185         while (function->name) {
186                 if (!strcmp(function->name, name)) {
187                         function->ngroups++;
188                         return -EEXIST;
189                 }
190                 function++;
191         }
192
193         function->name = name;
194         function->ngroups = 1;
195
196         pctrl->nfunctions++;
197
198         return 0;
199 }
200
201 static int berlin_pinctrl_build_state(struct platform_device *pdev)
202 {
203         struct berlin_pinctrl *pctrl = platform_get_drvdata(pdev);
204         const struct berlin_desc_group *desc_group;
205         const struct berlin_desc_function *desc_function;
206         int i, max_functions = 0;
207
208         pctrl->nfunctions = 0;
209
210         for (i = 0; i < pctrl->desc->ngroups; i++) {
211                 desc_group = pctrl->desc->groups + i;
212                 /* compute the maxiumum number of functions a group can have */
213                 max_functions += 1 << (desc_group->bit_width + 1);
214         }
215
216         /* we will reallocate later */
217         pctrl->functions = kcalloc(max_functions,
218                                    sizeof(*pctrl->functions), GFP_KERNEL);
219         if (!pctrl->functions)
220                 return -ENOMEM;
221
222         /* register all functions */
223         for (i = 0; i < pctrl->desc->ngroups; i++) {
224                 desc_group = pctrl->desc->groups + i;
225                 desc_function = desc_group->functions;
226
227                 while (desc_function->name) {
228                         berlin_pinctrl_add_function(pctrl, desc_function->name);
229                         desc_function++;
230                 }
231         }
232
233         pctrl->functions = krealloc(pctrl->functions,
234                                     pctrl->nfunctions * sizeof(*pctrl->functions),
235                                     GFP_KERNEL);
236
237         /* map functions to theirs groups */
238         for (i = 0; i < pctrl->desc->ngroups; i++) {
239                 desc_group = pctrl->desc->groups + i;
240                 desc_function = desc_group->functions;
241
242                 while (desc_function->name) {
243                         struct berlin_pinctrl_function
244                                 *function = pctrl->functions;
245                         const char **groups;
246                         bool found = false;
247
248                         while (function->name) {
249                                 if (!strcmp(desc_function->name, function->name)) {
250                                         found = true;
251                                         break;
252                                 }
253                                 function++;
254                         }
255
256                         if (!found) {
257                                 kfree(pctrl->functions);
258                                 return -EINVAL;
259                         }
260
261                         if (!function->groups) {
262                                 function->groups =
263                                         devm_kcalloc(&pdev->dev,
264                                                      function->ngroups,
265                                                      sizeof(char *),
266                                                      GFP_KERNEL);
267
268                                 if (!function->groups) {
269                                         kfree(pctrl->functions);
270                                         return -ENOMEM;
271                                 }
272                         }
273
274                         groups = function->groups;
275                         while (*groups)
276                                 groups++;
277
278                         *groups = desc_group->name;
279
280                         desc_function++;
281                 }
282         }
283
284         return 0;
285 }
286
287 static struct pinctrl_desc berlin_pctrl_desc = {
288         .name           = "berlin-pinctrl",
289         .pctlops        = &berlin_pinctrl_ops,
290         .pmxops         = &berlin_pinmux_ops,
291         .owner          = THIS_MODULE,
292 };
293
294 int berlin_pinctrl_probe_regmap(struct platform_device *pdev,
295                                 const struct berlin_pinctrl_desc *desc,
296                                 struct regmap *regmap)
297 {
298         struct device *dev = &pdev->dev;
299         struct berlin_pinctrl *pctrl;
300         int ret;
301
302         pctrl = devm_kzalloc(dev, sizeof(*pctrl), GFP_KERNEL);
303         if (!pctrl)
304                 return -ENOMEM;
305
306         platform_set_drvdata(pdev, pctrl);
307
308         pctrl->regmap = regmap;
309         pctrl->dev = &pdev->dev;
310         pctrl->desc = desc;
311
312         ret = berlin_pinctrl_build_state(pdev);
313         if (ret) {
314                 dev_err(dev, "cannot build driver state: %d\n", ret);
315                 return ret;
316         }
317
318         pctrl->pctrl_dev = devm_pinctrl_register(dev, &berlin_pctrl_desc,
319                                                  pctrl);
320         if (IS_ERR(pctrl->pctrl_dev)) {
321                 dev_err(dev, "failed to register pinctrl driver\n");
322                 return PTR_ERR(pctrl->pctrl_dev);
323         }
324
325         return 0;
326 }
327
328 int berlin_pinctrl_probe(struct platform_device *pdev,
329                          const struct berlin_pinctrl_desc *desc)
330 {
331         struct device *dev = &pdev->dev;
332         struct device_node *parent_np = of_get_parent(dev->of_node);
333         struct regmap *regmap = syscon_node_to_regmap(parent_np);
334
335         of_node_put(parent_np);
336         if (IS_ERR(regmap))
337                 return PTR_ERR(regmap);
338
339         return berlin_pinctrl_probe_regmap(pdev, desc, regmap);
340 }