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1d0ea069 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3f8c50c9 JC |
2 | /* |
3 | * linux/drivers/pinctrl/pinctrl-lantiq.c | |
4 | * based on linux/drivers/pinctrl/pinctrl-pxa3xx.c | |
5 | * | |
55e40950 | 6 | * Copyright (C) 2012 John Crispin <john@phrozen.org> |
3f8c50c9 JC |
7 | */ |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/device.h> | |
11 | #include <linux/io.h> | |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/of.h> | |
15 | ||
16 | #include "pinctrl-lantiq.h" | |
17 | ||
18 | static int ltq_get_group_count(struct pinctrl_dev *pctrldev) | |
19 | { | |
20 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev); | |
21 | return info->num_grps; | |
22 | } | |
23 | ||
24 | static const char *ltq_get_group_name(struct pinctrl_dev *pctrldev, | |
25 | unsigned selector) | |
26 | { | |
27 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev); | |
28 | if (selector >= info->num_grps) | |
29 | return NULL; | |
30 | return info->grps[selector].name; | |
31 | } | |
32 | ||
33 | static int ltq_get_group_pins(struct pinctrl_dev *pctrldev, | |
34 | unsigned selector, | |
35 | const unsigned **pins, | |
36 | unsigned *num_pins) | |
37 | { | |
38 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev); | |
39 | if (selector >= info->num_grps) | |
40 | return -EINVAL; | |
41 | *pins = info->grps[selector].pins; | |
42 | *num_pins = info->grps[selector].npins; | |
43 | return 0; | |
44 | } | |
45 | ||
89377aa5 AL |
46 | static void ltq_pinctrl_dt_free_map(struct pinctrl_dev *pctldev, |
47 | struct pinctrl_map *map, unsigned num_maps) | |
3f8c50c9 JC |
48 | { |
49 | int i; | |
50 | ||
51 | for (i = 0; i < num_maps; i++) | |
1dda2fa6 LP |
52 | if (map[i].type == PIN_MAP_TYPE_CONFIGS_PIN || |
53 | map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP) | |
3f8c50c9 JC |
54 | kfree(map[i].data.configs.configs); |
55 | kfree(map); | |
56 | } | |
57 | ||
58 | static void ltq_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev, | |
59 | struct seq_file *s, | |
60 | unsigned offset) | |
61 | { | |
62 | seq_printf(s, " %s", dev_name(pctldev->dev)); | |
63 | } | |
64 | ||
3a6b04ca | 65 | static void ltq_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev, |
3f8c50c9 JC |
66 | struct device_node *np, |
67 | struct pinctrl_map **map) | |
68 | { | |
69 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctldev); | |
3a6b04ca JC |
70 | struct property *pins = of_find_property(np, "lantiq,pins", NULL); |
71 | struct property *groups = of_find_property(np, "lantiq,groups", NULL); | |
3f8c50c9 JC |
72 | unsigned long configs[3]; |
73 | unsigned num_configs = 0; | |
74 | struct property *prop; | |
75 | const char *group, *pin; | |
76 | const char *function; | |
77 | int ret, i; | |
78 | ||
3a6b04ca | 79 | if (!pins && !groups) { |
94f4e54c RH |
80 | dev_err(pctldev->dev, "%pOFn defines neither pins nor groups\n", |
81 | np); | |
3a6b04ca JC |
82 | return; |
83 | } | |
84 | ||
85 | if (pins && groups) { | |
94f4e54c RH |
86 | dev_err(pctldev->dev, "%pOFn defines both pins and groups\n", |
87 | np); | |
3a6b04ca JC |
88 | return; |
89 | } | |
90 | ||
3f8c50c9 | 91 | ret = of_property_read_string(np, "lantiq,function", &function); |
3a6b04ca | 92 | if (groups && !ret) { |
3f8c50c9 JC |
93 | of_property_for_each_string(np, "lantiq,groups", prop, group) { |
94 | (*map)->type = PIN_MAP_TYPE_MUX_GROUP; | |
95 | (*map)->name = function; | |
96 | (*map)->data.mux.group = group; | |
97 | (*map)->data.mux.function = function; | |
98 | (*map)++; | |
99 | } | |
3f8c50c9 JC |
100 | } |
101 | ||
102 | for (i = 0; i < info->num_params; i++) { | |
103 | u32 val; | |
104 | int ret = of_property_read_u32(np, | |
105 | info->params[i].property, &val); | |
106 | if (!ret) | |
107 | configs[num_configs++] = | |
108 | LTQ_PINCONF_PACK(info->params[i].param, | |
109 | val); | |
110 | } | |
111 | ||
112 | if (!num_configs) | |
3a6b04ca | 113 | return; |
3f8c50c9 JC |
114 | |
115 | of_property_for_each_string(np, "lantiq,pins", prop, pin) { | |
116 | (*map)->data.configs.configs = kmemdup(configs, | |
117 | num_configs * sizeof(unsigned long), | |
118 | GFP_KERNEL); | |
119 | (*map)->type = PIN_MAP_TYPE_CONFIGS_PIN; | |
120 | (*map)->name = pin; | |
121 | (*map)->data.configs.group_or_pin = pin; | |
122 | (*map)->data.configs.num_configs = num_configs; | |
123 | (*map)++; | |
124 | } | |
3a6b04ca JC |
125 | of_property_for_each_string(np, "lantiq,groups", prop, group) { |
126 | (*map)->data.configs.configs = kmemdup(configs, | |
127 | num_configs * sizeof(unsigned long), | |
128 | GFP_KERNEL); | |
129 | (*map)->type = PIN_MAP_TYPE_CONFIGS_GROUP; | |
130 | (*map)->name = group; | |
131 | (*map)->data.configs.group_or_pin = group; | |
132 | (*map)->data.configs.num_configs = num_configs; | |
133 | (*map)++; | |
134 | } | |
3f8c50c9 JC |
135 | } |
136 | ||
137 | static int ltq_pinctrl_dt_subnode_size(struct device_node *np) | |
138 | { | |
139 | int ret; | |
140 | ||
141 | ret = of_property_count_strings(np, "lantiq,groups"); | |
142 | if (ret < 0) | |
143 | ret = of_property_count_strings(np, "lantiq,pins"); | |
144 | return ret; | |
145 | } | |
146 | ||
89377aa5 AL |
147 | static int ltq_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev, |
148 | struct device_node *np_config, | |
149 | struct pinctrl_map **map, | |
150 | unsigned *num_maps) | |
3f8c50c9 JC |
151 | { |
152 | struct pinctrl_map *tmp; | |
153 | struct device_node *np; | |
3a6b04ca | 154 | int max_maps = 0; |
3f8c50c9 | 155 | |
3f8c50c9 | 156 | for_each_child_of_node(np_config, np) |
3a6b04ca | 157 | max_maps += ltq_pinctrl_dt_subnode_size(np); |
6396bb22 KC |
158 | *map = kzalloc(array3_size(max_maps, sizeof(struct pinctrl_map), 2), |
159 | GFP_KERNEL); | |
3f8c50c9 JC |
160 | if (!*map) |
161 | return -ENOMEM; | |
162 | tmp = *map; | |
163 | ||
3a6b04ca JC |
164 | for_each_child_of_node(np_config, np) |
165 | ltq_pinctrl_dt_subnode_to_map(pctldev, np, &tmp); | |
166 | *num_maps = ((int)(tmp - *map)); | |
167 | ||
3f8c50c9 JC |
168 | return 0; |
169 | } | |
170 | ||
022ab148 | 171 | static const struct pinctrl_ops ltq_pctrl_ops = { |
3f8c50c9 JC |
172 | .get_groups_count = ltq_get_group_count, |
173 | .get_group_name = ltq_get_group_name, | |
174 | .get_group_pins = ltq_get_group_pins, | |
175 | .pin_dbg_show = ltq_pinctrl_pin_dbg_show, | |
176 | .dt_node_to_map = ltq_pinctrl_dt_node_to_map, | |
177 | .dt_free_map = ltq_pinctrl_dt_free_map, | |
178 | }; | |
179 | ||
180 | static int ltq_pmx_func_count(struct pinctrl_dev *pctrldev) | |
181 | { | |
182 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev); | |
183 | ||
184 | return info->num_funcs; | |
185 | } | |
186 | ||
187 | static const char *ltq_pmx_func_name(struct pinctrl_dev *pctrldev, | |
188 | unsigned selector) | |
189 | { | |
190 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev); | |
191 | ||
192 | if (selector >= info->num_funcs) | |
193 | return NULL; | |
194 | ||
195 | return info->funcs[selector].name; | |
196 | } | |
197 | ||
198 | static int ltq_pmx_get_groups(struct pinctrl_dev *pctrldev, | |
199 | unsigned func, | |
200 | const char * const **groups, | |
201 | unsigned * const num_groups) | |
202 | { | |
203 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev); | |
204 | ||
205 | *groups = info->funcs[func].groups; | |
206 | *num_groups = info->funcs[func].num_groups; | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | /* Return function number. If failure, return negative value. */ | |
212 | static int match_mux(const struct ltq_mfp_pin *mfp, unsigned mux) | |
213 | { | |
214 | int i; | |
215 | for (i = 0; i < LTQ_MAX_MUX; i++) { | |
216 | if (mfp->func[i] == mux) | |
217 | break; | |
218 | } | |
219 | if (i >= LTQ_MAX_MUX) | |
220 | return -EINVAL; | |
221 | return i; | |
222 | } | |
223 | ||
d71ffeb9 | 224 | /* don't assume .mfp is linearly mapped. find the mfp with the correct .pin */ |
3f8c50c9 JC |
225 | static int match_mfp(const struct ltq_pinmux_info *info, int pin) |
226 | { | |
227 | int i; | |
228 | for (i = 0; i < info->num_mfp; i++) { | |
229 | if (info->mfp[i].pin == pin) | |
230 | return i; | |
231 | } | |
232 | return -1; | |
233 | } | |
234 | ||
235 | /* check whether current pin configuration is valid. Negative for failure */ | |
236 | static int match_group_mux(const struct ltq_pin_group *grp, | |
237 | const struct ltq_pinmux_info *info, | |
238 | unsigned mux) | |
239 | { | |
240 | int i, pin, ret = 0; | |
241 | for (i = 0; i < grp->npins; i++) { | |
242 | pin = match_mfp(info, grp->pins[i]); | |
243 | if (pin < 0) { | |
244 | dev_err(info->dev, "could not find mfp for pin %d\n", | |
245 | grp->pins[i]); | |
246 | return -EINVAL; | |
247 | } | |
248 | ret = match_mux(&info->mfp[pin], mux); | |
249 | if (ret < 0) { | |
250 | dev_err(info->dev, "Can't find mux %d on pin%d\n", | |
251 | mux, pin); | |
252 | break; | |
253 | } | |
254 | } | |
255 | return ret; | |
256 | } | |
257 | ||
03e9f0ca LW |
258 | static int ltq_pmx_set(struct pinctrl_dev *pctrldev, |
259 | unsigned func, | |
260 | unsigned group) | |
3f8c50c9 JC |
261 | { |
262 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev); | |
263 | const struct ltq_pin_group *pin_grp = &info->grps[group]; | |
264 | int i, pin, pin_func, ret; | |
265 | ||
266 | if (!pin_grp->npins || | |
267 | (match_group_mux(pin_grp, info, pin_grp->mux) < 0)) { | |
268 | dev_err(info->dev, "Failed to set the pin group: %s\n", | |
269 | info->grps[group].name); | |
270 | return -EINVAL; | |
271 | } | |
272 | for (i = 0; i < pin_grp->npins; i++) { | |
273 | pin = match_mfp(info, pin_grp->pins[i]); | |
274 | if (pin < 0) { | |
275 | dev_err(info->dev, "could not find mfp for pin %d\n", | |
276 | pin_grp->pins[i]); | |
277 | return -EINVAL; | |
278 | } | |
279 | pin_func = match_mux(&info->mfp[pin], pin_grp->mux); | |
280 | ret = info->apply_mux(pctrldev, pin, pin_func); | |
281 | if (ret) { | |
282 | dev_err(info->dev, | |
283 | "failed to apply mux %d for pin %d\n", | |
284 | pin_func, pin); | |
285 | return ret; | |
286 | } | |
287 | } | |
288 | return 0; | |
289 | } | |
290 | ||
3f8c50c9 JC |
291 | static int ltq_pmx_gpio_request_enable(struct pinctrl_dev *pctrldev, |
292 | struct pinctrl_gpio_range *range, | |
293 | unsigned pin) | |
294 | { | |
295 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev); | |
d8a7c1f1 | 296 | int mfp = match_mfp(info, pin); |
3f8c50c9 JC |
297 | int pin_func; |
298 | ||
299 | if (mfp < 0) { | |
300 | dev_err(info->dev, "could not find mfp for pin %d\n", pin); | |
301 | return -EINVAL; | |
302 | } | |
303 | ||
304 | pin_func = match_mux(&info->mfp[mfp], 0); | |
305 | if (pin_func < 0) { | |
306 | dev_err(info->dev, "No GPIO function on pin%d\n", mfp); | |
307 | return -EINVAL; | |
308 | } | |
309 | ||
310 | return info->apply_mux(pctrldev, mfp, pin_func); | |
311 | } | |
312 | ||
022ab148 | 313 | static const struct pinmux_ops ltq_pmx_ops = { |
3f8c50c9 JC |
314 | .get_functions_count = ltq_pmx_func_count, |
315 | .get_function_name = ltq_pmx_func_name, | |
316 | .get_function_groups = ltq_pmx_get_groups, | |
03e9f0ca | 317 | .set_mux = ltq_pmx_set, |
3f8c50c9 JC |
318 | .gpio_request_enable = ltq_pmx_gpio_request_enable, |
319 | }; | |
320 | ||
321 | /* | |
322 | * allow different socs to register with the generic part of the lanti | |
323 | * pinctrl code | |
324 | */ | |
325 | int ltq_pinctrl_register(struct platform_device *pdev, | |
326 | struct ltq_pinmux_info *info) | |
327 | { | |
328 | struct pinctrl_desc *desc; | |
329 | ||
330 | if (!info) | |
331 | return -EINVAL; | |
332 | desc = info->desc; | |
333 | desc->pctlops = <q_pctrl_ops; | |
334 | desc->pmxops = <q_pmx_ops; | |
335 | info->dev = &pdev->dev; | |
336 | ||
280132d1 | 337 | info->pctrl = devm_pinctrl_register(&pdev->dev, desc, info); |
323de9ef | 338 | if (IS_ERR(info->pctrl)) { |
3f8c50c9 | 339 | dev_err(&pdev->dev, "failed to register LTQ pinmux driver\n"); |
323de9ef | 340 | return PTR_ERR(info->pctrl); |
3f8c50c9 JC |
341 | } |
342 | platform_set_drvdata(pdev, info); | |
343 | return 0; | |
344 | } |