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3f8c50c9 JC |
1 | /* |
2 | * linux/drivers/pinctrl/pinctrl-lantiq.c | |
3 | * based on linux/drivers/pinctrl/pinctrl-pxa3xx.c | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * publishhed by the Free Software Foundation. | |
8 | * | |
9 | * Copyright (C) 2012 John Crispin <blogic@openwrt.org> | |
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 | ||
21 | static 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 | ||
27 | static 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 | ||
36 | static 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 | ||
89377aa5 AL |
49 | static void ltq_pinctrl_dt_free_map(struct pinctrl_dev *pctldev, |
50 | struct pinctrl_map *map, unsigned num_maps) | |
3f8c50c9 JC |
51 | { |
52 | int i; | |
53 | ||
54 | for (i = 0; i < num_maps; i++) | |
1dda2fa6 LP |
55 | if (map[i].type == PIN_MAP_TYPE_CONFIGS_PIN || |
56 | map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP) | |
3f8c50c9 JC |
57 | kfree(map[i].data.configs.configs); |
58 | kfree(map); | |
59 | } | |
60 | ||
61 | static 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 | ||
3a6b04ca | 68 | static void ltq_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev, |
3f8c50c9 JC |
69 | struct device_node *np, |
70 | struct pinctrl_map **map) | |
71 | { | |
72 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctldev); | |
3a6b04ca JC |
73 | struct property *pins = of_find_property(np, "lantiq,pins", NULL); |
74 | struct property *groups = of_find_property(np, "lantiq,groups", NULL); | |
3f8c50c9 JC |
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 | ||
3a6b04ca JC |
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 | ||
3f8c50c9 | 94 | ret = of_property_read_string(np, "lantiq,function", &function); |
3a6b04ca | 95 | if (groups && !ret) { |
3f8c50c9 JC |
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 | } | |
3f8c50c9 JC |
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) | |
3a6b04ca | 116 | return; |
3f8c50c9 JC |
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 | } | |
3a6b04ca JC |
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 | } | |
3f8c50c9 JC |
138 | } |
139 | ||
140 | static 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 | ||
89377aa5 AL |
150 | static 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) | |
3f8c50c9 JC |
154 | { |
155 | struct pinctrl_map *tmp; | |
156 | struct device_node *np; | |
3a6b04ca | 157 | int max_maps = 0; |
3f8c50c9 | 158 | |
3f8c50c9 | 159 | for_each_child_of_node(np_config, np) |
3a6b04ca JC |
160 | max_maps += ltq_pinctrl_dt_subnode_size(np); |
161 | *map = kzalloc(max_maps * sizeof(struct pinctrl_map) * 2, GFP_KERNEL); | |
3f8c50c9 JC |
162 | if (!*map) |
163 | return -ENOMEM; | |
164 | tmp = *map; | |
165 | ||
3a6b04ca JC |
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 | ||
3f8c50c9 JC |
170 | return 0; |
171 | } | |
172 | ||
022ab148 | 173 | static const struct pinctrl_ops ltq_pctrl_ops = { |
3f8c50c9 JC |
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 | ||
182 | static 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 | ||
189 | static 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 | ||
200 | static 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 | /* Return function number. If failure, return negative value. */ | |
214 | static 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 | /* dont assume .mfp is linearly mapped. find the mfp with the correct .pin */ | |
227 | static 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 | /* check whether current pin configuration is valid. Negative for failure */ | |
238 | static 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 | ||
260 | static int ltq_pmx_enable(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 | ||
3f8c50c9 JC |
293 | static 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); | |
d8a7c1f1 | 298 | int mfp = match_mfp(info, pin); |
3f8c50c9 JC |
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 | ||
022ab148 | 315 | static const struct pinmux_ops ltq_pmx_ops = { |
3f8c50c9 JC |
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 | .enable = ltq_pmx_enable, | |
3f8c50c9 JC |
320 | .gpio_request_enable = ltq_pmx_gpio_request_enable, |
321 | }; | |
322 | ||
323 | /* | |
324 | * allow different socs to register with the generic part of the lanti | |
325 | * pinctrl code | |
326 | */ | |
327 | int 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 = pinctrl_register(desc, &pdev->dev, info); | |
340 | if (!info->pctrl) { | |
341 | dev_err(&pdev->dev, "failed to register LTQ pinmux driver\n"); | |
342 | return -EINVAL; | |
343 | } | |
344 | platform_set_drvdata(pdev, info); | |
345 | return 0; | |
346 | } |