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
berlin_pinctrl_get_group_count(struct pinctrl_dev * pctrl_dev)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
berlin_pinctrl_get_group_name(struct pinctrl_dev * pctrl_dev,unsigned group)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
berlin_pinctrl_dt_node_to_map(struct pinctrl_dev * pctrl_dev,struct device_node * node,struct pinctrl_map ** map,unsigned * num_maps)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
berlin_pinmux_get_functions_count(struct pinctrl_dev * pctrl_dev)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
berlin_pinmux_get_function_name(struct pinctrl_dev * pctrl_dev,unsigned function)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
berlin_pinmux_get_function_groups(struct pinctrl_dev * pctrl_dev,unsigned function,const char * const ** groups,unsigned * const num_groups)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 *
berlin_pinctrl_find_function_by_name(struct berlin_pinctrl * pctrl,const struct berlin_desc_group * group,const char * fname)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
berlin_pinmux_set(struct pinctrl_dev * pctrl_dev,unsigned function,unsigned group)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
berlin_pinctrl_add_function(struct berlin_pinctrl * pctrl,const char * name)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
berlin_pinctrl_build_state(struct platform_device * pdev)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 maximum 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 if (!pctrl->functions)
237 return -ENOMEM;
238
239 /* map functions to theirs groups */
240 for (i = 0; i < pctrl->desc->ngroups; i++) {
241 desc_group = pctrl->desc->groups + i;
242 desc_function = desc_group->functions;
243
244 while (desc_function->name) {
245 struct berlin_pinctrl_function
246 *function = pctrl->functions;
247 const char **groups;
248 bool found = false;
249
250 while (function->name) {
251 if (!strcmp(desc_function->name, function->name)) {
252 found = true;
253 break;
254 }
255 function++;
256 }
257
258 if (!found) {
259 kfree(pctrl->functions);
260 return -EINVAL;
261 }
262
263 if (!function->groups) {
264 function->groups =
265 devm_kcalloc(&pdev->dev,
266 function->ngroups,
267 sizeof(char *),
268 GFP_KERNEL);
269
270 if (!function->groups) {
271 kfree(pctrl->functions);
272 return -ENOMEM;
273 }
274 }
275
276 groups = function->groups;
277 while (*groups)
278 groups++;
279
280 *groups = desc_group->name;
281
282 desc_function++;
283 }
284 }
285
286 return 0;
287 }
288
289 static struct pinctrl_desc berlin_pctrl_desc = {
290 .name = "berlin-pinctrl",
291 .pctlops = &berlin_pinctrl_ops,
292 .pmxops = &berlin_pinmux_ops,
293 .owner = THIS_MODULE,
294 };
295
berlin_pinctrl_probe_regmap(struct platform_device * pdev,const struct berlin_pinctrl_desc * desc,struct regmap * regmap)296 int berlin_pinctrl_probe_regmap(struct platform_device *pdev,
297 const struct berlin_pinctrl_desc *desc,
298 struct regmap *regmap)
299 {
300 struct device *dev = &pdev->dev;
301 struct berlin_pinctrl *pctrl;
302 int ret;
303
304 pctrl = devm_kzalloc(dev, sizeof(*pctrl), GFP_KERNEL);
305 if (!pctrl)
306 return -ENOMEM;
307
308 platform_set_drvdata(pdev, pctrl);
309
310 pctrl->regmap = regmap;
311 pctrl->dev = &pdev->dev;
312 pctrl->desc = desc;
313
314 ret = berlin_pinctrl_build_state(pdev);
315 if (ret) {
316 dev_err(dev, "cannot build driver state: %d\n", ret);
317 return ret;
318 }
319
320 pctrl->pctrl_dev = devm_pinctrl_register(dev, &berlin_pctrl_desc,
321 pctrl);
322 if (IS_ERR(pctrl->pctrl_dev)) {
323 dev_err(dev, "failed to register pinctrl driver\n");
324 return PTR_ERR(pctrl->pctrl_dev);
325 }
326
327 return 0;
328 }
329
berlin_pinctrl_probe(struct platform_device * pdev,const struct berlin_pinctrl_desc * desc)330 int berlin_pinctrl_probe(struct platform_device *pdev,
331 const struct berlin_pinctrl_desc *desc)
332 {
333 struct device *dev = &pdev->dev;
334 struct device_node *parent_np = of_get_parent(dev->of_node);
335 struct regmap *regmap = syscon_node_to_regmap(parent_np);
336
337 of_node_put(parent_np);
338 if (IS_ERR(regmap))
339 return PTR_ERR(regmap);
340
341 return berlin_pinctrl_probe_regmap(pdev, desc, regmap);
342 }
343