1
2
3
4
5
6
7
8
9
10
11
12#include <linux/module.h>
13#include <linux/device.h>
14#include <linux/io.h>
15#include <linux/platform_device.h>
16#include <linux/slab.h>
17#include <linux/of.h>
18
19#include "pinctrl-lantiq.h"
20
21static int ltq_get_group_count(struct pinctrl_dev *pctrldev)
22{
23 struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
24 return info->num_grps;
25}
26
27static const char *ltq_get_group_name(struct pinctrl_dev *pctrldev,
28 unsigned selector)
29{
30 struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
31 if (selector >= info->num_grps)
32 return NULL;
33 return info->grps[selector].name;
34}
35
36static int ltq_get_group_pins(struct pinctrl_dev *pctrldev,
37 unsigned selector,
38 const unsigned **pins,
39 unsigned *num_pins)
40{
41 struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
42 if (selector >= info->num_grps)
43 return -EINVAL;
44 *pins = info->grps[selector].pins;
45 *num_pins = info->grps[selector].npins;
46 return 0;
47}
48
49static void ltq_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
50 struct pinctrl_map *map, unsigned num_maps)
51{
52 int i;
53
54 for (i = 0; i < num_maps; i++)
55 if (map[i].type == PIN_MAP_TYPE_CONFIGS_PIN ||
56 map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP)
57 kfree(map[i].data.configs.configs);
58 kfree(map);
59}
60
61static void ltq_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
62 struct seq_file *s,
63 unsigned offset)
64{
65 seq_printf(s, " %s", dev_name(pctldev->dev));
66}
67
68static void ltq_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
69 struct device_node *np,
70 struct pinctrl_map **map)
71{
72 struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctldev);
73 struct property *pins = of_find_property(np, "lantiq,pins", NULL);
74 struct property *groups = of_find_property(np, "lantiq,groups", NULL);
75 unsigned long configs[3];
76 unsigned num_configs = 0;
77 struct property *prop;
78 const char *group, *pin;
79 const char *function;
80 int ret, i;
81
82 if (!pins && !groups) {
83 dev_err(pctldev->dev, "%s defines neither pins nor groups\n",
84 np->name);
85 return;
86 }
87
88 if (pins && groups) {
89 dev_err(pctldev->dev, "%s defines both pins and groups\n",
90 np->name);
91 return;
92 }
93
94 ret = of_property_read_string(np, "lantiq,function", &function);
95 if (groups && !ret) {
96 of_property_for_each_string(np, "lantiq,groups", prop, group) {
97 (*map)->type = PIN_MAP_TYPE_MUX_GROUP;
98 (*map)->name = function;
99 (*map)->data.mux.group = group;
100 (*map)->data.mux.function = function;
101 (*map)++;
102 }
103 }
104
105 for (i = 0; i < info->num_params; i++) {
106 u32 val;
107 int ret = of_property_read_u32(np,
108 info->params[i].property, &val);
109 if (!ret)
110 configs[num_configs++] =
111 LTQ_PINCONF_PACK(info->params[i].param,
112 val);
113 }
114
115 if (!num_configs)
116 return;
117
118 of_property_for_each_string(np, "lantiq,pins", prop, pin) {
119 (*map)->data.configs.configs = kmemdup(configs,
120 num_configs * sizeof(unsigned long),
121 GFP_KERNEL);
122 (*map)->type = PIN_MAP_TYPE_CONFIGS_PIN;
123 (*map)->name = pin;
124 (*map)->data.configs.group_or_pin = pin;
125 (*map)->data.configs.num_configs = num_configs;
126 (*map)++;
127 }
128 of_property_for_each_string(np, "lantiq,groups", prop, group) {
129 (*map)->data.configs.configs = kmemdup(configs,
130 num_configs * sizeof(unsigned long),
131 GFP_KERNEL);
132 (*map)->type = PIN_MAP_TYPE_CONFIGS_GROUP;
133 (*map)->name = group;
134 (*map)->data.configs.group_or_pin = group;
135 (*map)->data.configs.num_configs = num_configs;
136 (*map)++;
137 }
138}
139
140static int ltq_pinctrl_dt_subnode_size(struct device_node *np)
141{
142 int ret;
143
144 ret = of_property_count_strings(np, "lantiq,groups");
145 if (ret < 0)
146 ret = of_property_count_strings(np, "lantiq,pins");
147 return ret;
148}
149
150static int ltq_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
151 struct device_node *np_config,
152 struct pinctrl_map **map,
153 unsigned *num_maps)
154{
155 struct pinctrl_map *tmp;
156 struct device_node *np;
157 int max_maps = 0;
158
159 for_each_child_of_node(np_config, np)
160 max_maps += ltq_pinctrl_dt_subnode_size(np);
161 *map = kzalloc(max_maps * sizeof(struct pinctrl_map) * 2, GFP_KERNEL);
162 if (!*map)
163 return -ENOMEM;
164 tmp = *map;
165
166 for_each_child_of_node(np_config, np)
167 ltq_pinctrl_dt_subnode_to_map(pctldev, np, &tmp);
168 *num_maps = ((int)(tmp - *map));
169
170 return 0;
171}
172
173static const struct pinctrl_ops ltq_pctrl_ops = {
174 .get_groups_count = ltq_get_group_count,
175 .get_group_name = ltq_get_group_name,
176 .get_group_pins = ltq_get_group_pins,
177 .pin_dbg_show = ltq_pinctrl_pin_dbg_show,
178 .dt_node_to_map = ltq_pinctrl_dt_node_to_map,
179 .dt_free_map = ltq_pinctrl_dt_free_map,
180};
181
182static int ltq_pmx_func_count(struct pinctrl_dev *pctrldev)
183{
184 struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
185
186 return info->num_funcs;
187}
188
189static const char *ltq_pmx_func_name(struct pinctrl_dev *pctrldev,
190 unsigned selector)
191{
192 struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
193
194 if (selector >= info->num_funcs)
195 return NULL;
196
197 return info->funcs[selector].name;
198}
199
200static int ltq_pmx_get_groups(struct pinctrl_dev *pctrldev,
201 unsigned func,
202 const char * const **groups,
203 unsigned * const num_groups)
204{
205 struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
206
207 *groups = info->funcs[func].groups;
208 *num_groups = info->funcs[func].num_groups;
209
210 return 0;
211}
212
213
214static int match_mux(const struct ltq_mfp_pin *mfp, unsigned mux)
215{
216 int i;
217 for (i = 0; i < LTQ_MAX_MUX; i++) {
218 if (mfp->func[i] == mux)
219 break;
220 }
221 if (i >= LTQ_MAX_MUX)
222 return -EINVAL;
223 return i;
224}
225
226
227static int match_mfp(const struct ltq_pinmux_info *info, int pin)
228{
229 int i;
230 for (i = 0; i < info->num_mfp; i++) {
231 if (info->mfp[i].pin == pin)
232 return i;
233 }
234 return -1;
235}
236
237
238static int match_group_mux(const struct ltq_pin_group *grp,
239 const struct ltq_pinmux_info *info,
240 unsigned mux)
241{
242 int i, pin, ret = 0;
243 for (i = 0; i < grp->npins; i++) {
244 pin = match_mfp(info, grp->pins[i]);
245 if (pin < 0) {
246 dev_err(info->dev, "could not find mfp for pin %d\n",
247 grp->pins[i]);
248 return -EINVAL;
249 }
250 ret = match_mux(&info->mfp[pin], mux);
251 if (ret < 0) {
252 dev_err(info->dev, "Can't find mux %d on pin%d\n",
253 mux, pin);
254 break;
255 }
256 }
257 return ret;
258}
259
260static int ltq_pmx_set(struct pinctrl_dev *pctrldev,
261 unsigned func,
262 unsigned group)
263{
264 struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
265 const struct ltq_pin_group *pin_grp = &info->grps[group];
266 int i, pin, pin_func, ret;
267
268 if (!pin_grp->npins ||
269 (match_group_mux(pin_grp, info, pin_grp->mux) < 0)) {
270 dev_err(info->dev, "Failed to set the pin group: %s\n",
271 info->grps[group].name);
272 return -EINVAL;
273 }
274 for (i = 0; i < pin_grp->npins; i++) {
275 pin = match_mfp(info, pin_grp->pins[i]);
276 if (pin < 0) {
277 dev_err(info->dev, "could not find mfp for pin %d\n",
278 pin_grp->pins[i]);
279 return -EINVAL;
280 }
281 pin_func = match_mux(&info->mfp[pin], pin_grp->mux);
282 ret = info->apply_mux(pctrldev, pin, pin_func);
283 if (ret) {
284 dev_err(info->dev,
285 "failed to apply mux %d for pin %d\n",
286 pin_func, pin);
287 return ret;
288 }
289 }
290 return 0;
291}
292
293static int ltq_pmx_gpio_request_enable(struct pinctrl_dev *pctrldev,
294 struct pinctrl_gpio_range *range,
295 unsigned pin)
296{
297 struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
298 int mfp = match_mfp(info, pin);
299 int pin_func;
300
301 if (mfp < 0) {
302 dev_err(info->dev, "could not find mfp for pin %d\n", pin);
303 return -EINVAL;
304 }
305
306 pin_func = match_mux(&info->mfp[mfp], 0);
307 if (pin_func < 0) {
308 dev_err(info->dev, "No GPIO function on pin%d\n", mfp);
309 return -EINVAL;
310 }
311
312 return info->apply_mux(pctrldev, mfp, pin_func);
313}
314
315static const struct pinmux_ops ltq_pmx_ops = {
316 .get_functions_count = ltq_pmx_func_count,
317 .get_function_name = ltq_pmx_func_name,
318 .get_function_groups = ltq_pmx_get_groups,
319 .set_mux = ltq_pmx_set,
320 .gpio_request_enable = ltq_pmx_gpio_request_enable,
321};
322
323
324
325
326
327int ltq_pinctrl_register(struct platform_device *pdev,
328 struct ltq_pinmux_info *info)
329{
330 struct pinctrl_desc *desc;
331
332 if (!info)
333 return -EINVAL;
334 desc = info->desc;
335 desc->pctlops = <q_pctrl_ops;
336 desc->pmxops = <q_pmx_ops;
337 info->dev = &pdev->dev;
338
339 info->pctrl = devm_pinctrl_register(&pdev->dev, desc, info);
340 if (IS_ERR(info->pctrl)) {
341 dev_err(&pdev->dev, "failed to register LTQ pinmux driver\n");
342 return PTR_ERR(info->pctrl);
343 }
344 platform_set_drvdata(pdev, info);
345 return 0;
346}
347
