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