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 %s\n",
68 node->name);
69 return -EINVAL;
70 }
71
72 ngroups = of_property_count_strings(node, "groups");
73 if (ngroups < 0) {
74 dev_err(pctrl->dev,
75 "missing groups property in node %s\n",
76 node->name);
77 return -EINVAL;
78 }
79
80 ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
81 num_maps, ngroups);
82 if (ret) {
83 dev_err(pctrl->dev, "can't reserve map: %d\n", ret);
84 return ret;
85 }
86
87 of_property_for_each_string(node, "groups", prop, group_name) {
88 ret = pinctrl_utils_add_map_mux(pctrl_dev, map, &reserved_maps,
89 num_maps, group_name,
90 function_name);
91 if (ret) {
92 dev_err(pctrl->dev, "can't add map: %d\n", ret);
93 return ret;
94 }
95 }
96
97 return 0;
98 }
99
100 static const struct pinctrl_ops berlin_pinctrl_ops = {
101 .get_groups_count = &berlin_pinctrl_get_group_count,
102 .get_group_name = &berlin_pinctrl_get_group_name,
103 .dt_node_to_map = &berlin_pinctrl_dt_node_to_map,
104 .dt_free_map = &pinctrl_utils_free_map,
105 };
106
berlin_pinmux_get_functions_count(struct pinctrl_dev * pctrl_dev)107 static int berlin_pinmux_get_functions_count(struct pinctrl_dev *pctrl_dev)
108 {
109 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
110
111 return pctrl->nfunctions;
112 }
113
berlin_pinmux_get_function_name(struct pinctrl_dev * pctrl_dev,unsigned function)114 static const char *berlin_pinmux_get_function_name(struct pinctrl_dev *pctrl_dev,
115 unsigned function)
116 {
117 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
118
119 return pctrl->functions[function].name;
120 }
121
berlin_pinmux_get_function_groups(struct pinctrl_dev * pctrl_dev,unsigned function,const char * const ** groups,unsigned * const num_groups)122 static int berlin_pinmux_get_function_groups(struct pinctrl_dev *pctrl_dev,
123 unsigned function,
124 const char * const **groups,
125 unsigned * const num_groups)
126 {
127 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
128
129 *groups = pctrl->functions[function].groups;
130 *num_groups = pctrl->functions[function].ngroups;
131
132 return 0;
133 }
134
135 static struct berlin_desc_function *
berlin_pinctrl_find_function_by_name(struct berlin_pinctrl * pctrl,const struct berlin_desc_group * group,const char * fname)136 berlin_pinctrl_find_function_by_name(struct berlin_pinctrl *pctrl,
137 const struct berlin_desc_group *group,
138 const char *fname)
139 {
140 struct berlin_desc_function *function = group->functions;
141
142 while (function->name) {
143 if (!strcmp(function->name, fname))
144 return function;
145
146 function++;
147 }
148
149 return NULL;
150 }
151
berlin_pinmux_set(struct pinctrl_dev * pctrl_dev,unsigned function,unsigned group)152 static int berlin_pinmux_set(struct pinctrl_dev *pctrl_dev,
153 unsigned function,
154 unsigned group)
155 {
156 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
157 const struct berlin_desc_group *group_desc = pctrl->desc->groups + group;
158 struct berlin_pinctrl_function *func = pctrl->functions + function;
159 struct berlin_desc_function *function_desc =
160 berlin_pinctrl_find_function_by_name(pctrl, group_desc,
161 func->name);
162 u32 mask, val;
163
164 if (!function_desc)
165 return -EINVAL;
166
167 mask = GENMASK(group_desc->lsb + group_desc->bit_width - 1,
168 group_desc->lsb);
169 val = function_desc->muxval << group_desc->lsb;
170 regmap_update_bits(pctrl->regmap, group_desc->offset, mask, val);
171
172 return 0;
173 }
174
175 static const struct pinmux_ops berlin_pinmux_ops = {
176 .get_functions_count = &berlin_pinmux_get_functions_count,
177 .get_function_name = &berlin_pinmux_get_function_name,
178 .get_function_groups = &berlin_pinmux_get_function_groups,
179 .set_mux = &berlin_pinmux_set,
180 };
181
berlin_pinctrl_add_function(struct berlin_pinctrl * pctrl,const char * name)182 static int berlin_pinctrl_add_function(struct berlin_pinctrl *pctrl,
183 const char *name)
184 {
185 struct berlin_pinctrl_function *function = pctrl->functions;
186
187 while (function->name) {
188 if (!strcmp(function->name, name)) {
189 function->ngroups++;
190 return -EEXIST;
191 }
192 function++;
193 }
194
195 function->name = name;
196 function->ngroups = 1;
197
198 pctrl->nfunctions++;
199
200 return 0;
201 }
202
berlin_pinctrl_build_state(struct platform_device * pdev)203 static int berlin_pinctrl_build_state(struct platform_device *pdev)
204 {
205 struct berlin_pinctrl *pctrl = platform_get_drvdata(pdev);
206 const struct berlin_desc_group *desc_group;
207 const struct berlin_desc_function *desc_function;
208 int i, max_functions = 0;
209
210 pctrl->nfunctions = 0;
211
212 for (i = 0; i < pctrl->desc->ngroups; i++) {
213 desc_group = pctrl->desc->groups + i;
214 /* compute the maxiumum number of functions a group can have */
215 max_functions += 1 << (desc_group->bit_width + 1);
216 }
217
218 /* we will reallocate later */
219 pctrl->functions = kcalloc(max_functions,
220 sizeof(*pctrl->functions), GFP_KERNEL);
221 if (!pctrl->functions)
222 return -ENOMEM;
223
224 /* register all functions */
225 for (i = 0; i < pctrl->desc->ngroups; i++) {
226 desc_group = pctrl->desc->groups + i;
227 desc_function = desc_group->functions;
228
229 while (desc_function->name) {
230 berlin_pinctrl_add_function(pctrl, desc_function->name);
231 desc_function++;
232 }
233 }
234
235 pctrl->functions = krealloc(pctrl->functions,
236 pctrl->nfunctions * sizeof(*pctrl->functions),
237 GFP_KERNEL);
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
