1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * linux/drivers/pinctrl/pinctrl-lantiq.c |
4 | * based on linux/drivers/pinctrl/pinctrl-pxa3xx.c |
5 | * |
6 | * Copyright (C) 2012 John Crispin <john@phrozen.org> |
7 | */ |
8 | |
9 | #include <linux/device.h> |
10 | #include <linux/io.h> |
11 | #include <linux/module.h> |
12 | #include <linux/of.h> |
13 | #include <linux/platform_device.h> |
14 | #include <linux/seq_file.h> |
15 | #include <linux/slab.h> |
16 | |
17 | #include "pinctrl-lantiq.h" |
18 | |
19 | static int ltq_get_group_count(struct pinctrl_dev *pctrldev) |
20 | { |
21 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctldev: pctrldev); |
22 | return info->num_grps; |
23 | } |
24 | |
25 | static const char *ltq_get_group_name(struct pinctrl_dev *pctrldev, |
26 | unsigned selector) |
27 | { |
28 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctldev: pctrldev); |
29 | if (selector >= info->num_grps) |
30 | return NULL; |
31 | return info->grps[selector].name; |
32 | } |
33 | |
34 | static int ltq_get_group_pins(struct pinctrl_dev *pctrldev, |
35 | unsigned selector, |
36 | const unsigned **pins, |
37 | unsigned *num_pins) |
38 | { |
39 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctldev: pctrldev); |
40 | if (selector >= info->num_grps) |
41 | return -EINVAL; |
42 | *pins = info->grps[selector].pins; |
43 | *num_pins = info->grps[selector].npins; |
44 | return 0; |
45 | } |
46 | |
47 | static void ltq_pinctrl_dt_free_map(struct pinctrl_dev *pctldev, |
48 | struct pinctrl_map *map, unsigned num_maps) |
49 | { |
50 | int i; |
51 | |
52 | for (i = 0; i < num_maps; i++) |
53 | if (map[i].type == PIN_MAP_TYPE_CONFIGS_PIN || |
54 | map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP) |
55 | kfree(objp: map[i].data.configs.configs); |
56 | kfree(objp: map); |
57 | } |
58 | |
59 | static void ltq_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev, |
60 | struct seq_file *s, |
61 | unsigned offset) |
62 | { |
63 | seq_printf(m: s, fmt: " %s" , dev_name(dev: pctldev->dev)); |
64 | } |
65 | |
66 | static void ltq_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev, |
67 | struct device_node *np, |
68 | struct pinctrl_map **map) |
69 | { |
70 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctldev); |
71 | struct property *pins = of_find_property(np, name: "lantiq,pins" , NULL); |
72 | struct property *groups = of_find_property(np, name: "lantiq,groups" , NULL); |
73 | unsigned long configs[3]; |
74 | unsigned num_configs = 0; |
75 | struct property *prop; |
76 | const char *group, *pin; |
77 | const char *function; |
78 | int ret, i; |
79 | |
80 | if (!pins && !groups) { |
81 | dev_err(pctldev->dev, "%pOFn defines neither pins nor groups\n" , |
82 | np); |
83 | return; |
84 | } |
85 | |
86 | if (pins && groups) { |
87 | dev_err(pctldev->dev, "%pOFn defines both pins and groups\n" , |
88 | np); |
89 | return; |
90 | } |
91 | |
92 | ret = of_property_read_string(np, propname: "lantiq,function" , out_string: &function); |
93 | if (groups && !ret) { |
94 | of_property_for_each_string(np, "lantiq,groups" , prop, group) { |
95 | (*map)->type = PIN_MAP_TYPE_MUX_GROUP; |
96 | (*map)->name = function; |
97 | (*map)->data.mux.group = group; |
98 | (*map)->data.mux.function = function; |
99 | (*map)++; |
100 | } |
101 | } |
102 | |
103 | for (i = 0; i < info->num_params; i++) { |
104 | u32 val; |
105 | int ret = of_property_read_u32(np, |
106 | propname: info->params[i].property, out_value: &val); |
107 | if (!ret) |
108 | configs[num_configs++] = |
109 | LTQ_PINCONF_PACK(info->params[i].param, |
110 | val); |
111 | } |
112 | |
113 | if (!num_configs) |
114 | return; |
115 | |
116 | of_property_for_each_string(np, "lantiq,pins" , prop, pin) { |
117 | (*map)->data.configs.configs = kmemdup(p: configs, |
118 | size: num_configs * sizeof(unsigned long), |
119 | GFP_KERNEL); |
120 | (*map)->type = PIN_MAP_TYPE_CONFIGS_PIN; |
121 | (*map)->name = pin; |
122 | (*map)->data.configs.group_or_pin = pin; |
123 | (*map)->data.configs.num_configs = num_configs; |
124 | (*map)++; |
125 | } |
126 | of_property_for_each_string(np, "lantiq,groups" , prop, group) { |
127 | (*map)->data.configs.configs = kmemdup(p: configs, |
128 | size: num_configs * sizeof(unsigned long), |
129 | GFP_KERNEL); |
130 | (*map)->type = PIN_MAP_TYPE_CONFIGS_GROUP; |
131 | (*map)->name = group; |
132 | (*map)->data.configs.group_or_pin = group; |
133 | (*map)->data.configs.num_configs = num_configs; |
134 | (*map)++; |
135 | } |
136 | } |
137 | |
138 | static int ltq_pinctrl_dt_subnode_size(struct device_node *np) |
139 | { |
140 | int ret; |
141 | |
142 | ret = of_property_count_strings(np, propname: "lantiq,groups" ); |
143 | if (ret < 0) |
144 | ret = of_property_count_strings(np, propname: "lantiq,pins" ); |
145 | return ret; |
146 | } |
147 | |
148 | static int ltq_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev, |
149 | struct device_node *np_config, |
150 | struct pinctrl_map **map, |
151 | unsigned *num_maps) |
152 | { |
153 | struct pinctrl_map *tmp; |
154 | struct device_node *np; |
155 | int max_maps = 0; |
156 | |
157 | for_each_child_of_node(np_config, np) |
158 | max_maps += ltq_pinctrl_dt_subnode_size(np); |
159 | *map = kzalloc(array3_size(max_maps, sizeof(struct pinctrl_map), 2), |
160 | GFP_KERNEL); |
161 | if (!*map) |
162 | return -ENOMEM; |
163 | tmp = *map; |
164 | |
165 | for_each_child_of_node(np_config, np) |
166 | ltq_pinctrl_dt_subnode_to_map(pctldev, np, map: &tmp); |
167 | *num_maps = ((int)(tmp - *map)); |
168 | |
169 | return 0; |
170 | } |
171 | |
172 | static const struct pinctrl_ops ltq_pctrl_ops = { |
173 | .get_groups_count = ltq_get_group_count, |
174 | .get_group_name = ltq_get_group_name, |
175 | .get_group_pins = ltq_get_group_pins, |
176 | .pin_dbg_show = ltq_pinctrl_pin_dbg_show, |
177 | .dt_node_to_map = ltq_pinctrl_dt_node_to_map, |
178 | .dt_free_map = ltq_pinctrl_dt_free_map, |
179 | }; |
180 | |
181 | static int ltq_pmx_func_count(struct pinctrl_dev *pctrldev) |
182 | { |
183 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctldev: pctrldev); |
184 | |
185 | return info->num_funcs; |
186 | } |
187 | |
188 | static const char *ltq_pmx_func_name(struct pinctrl_dev *pctrldev, |
189 | unsigned selector) |
190 | { |
191 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctldev: pctrldev); |
192 | |
193 | if (selector >= info->num_funcs) |
194 | return NULL; |
195 | |
196 | return info->funcs[selector].name; |
197 | } |
198 | |
199 | static int ltq_pmx_get_groups(struct pinctrl_dev *pctrldev, |
200 | unsigned func, |
201 | const char * const **groups, |
202 | unsigned * const num_groups) |
203 | { |
204 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctldev: pctrldev); |
205 | |
206 | *groups = info->funcs[func].groups; |
207 | *num_groups = info->funcs[func].num_groups; |
208 | |
209 | return 0; |
210 | } |
211 | |
212 | /* Return function number. If failure, return negative value. */ |
213 | static int match_mux(const struct ltq_mfp_pin *mfp, unsigned mux) |
214 | { |
215 | int i; |
216 | for (i = 0; i < LTQ_MAX_MUX; i++) { |
217 | if (mfp->func[i] == mux) |
218 | break; |
219 | } |
220 | if (i >= LTQ_MAX_MUX) |
221 | return -EINVAL; |
222 | return i; |
223 | } |
224 | |
225 | /* don't assume .mfp is linearly mapped. find the mfp with the correct .pin */ |
226 | static int match_mfp(const struct ltq_pinmux_info *info, int pin) |
227 | { |
228 | int i; |
229 | for (i = 0; i < info->num_mfp; i++) { |
230 | if (info->mfp[i].pin == pin) |
231 | return i; |
232 | } |
233 | return -1; |
234 | } |
235 | |
236 | /* check whether current pin configuration is valid. Negative for failure */ |
237 | static int match_group_mux(const struct ltq_pin_group *grp, |
238 | const struct ltq_pinmux_info *info, |
239 | unsigned mux) |
240 | { |
241 | int i, pin, ret = 0; |
242 | for (i = 0; i < grp->npins; i++) { |
243 | pin = match_mfp(info, pin: grp->pins[i]); |
244 | if (pin < 0) { |
245 | dev_err(info->dev, "could not find mfp for pin %d\n" , |
246 | grp->pins[i]); |
247 | return -EINVAL; |
248 | } |
249 | ret = match_mux(mfp: &info->mfp[pin], mux); |
250 | if (ret < 0) { |
251 | dev_err(info->dev, "Can't find mux %d on pin%d\n" , |
252 | mux, pin); |
253 | break; |
254 | } |
255 | } |
256 | return ret; |
257 | } |
258 | |
259 | static int ltq_pmx_set(struct pinctrl_dev *pctrldev, |
260 | unsigned func, |
261 | unsigned group) |
262 | { |
263 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctldev: pctrldev); |
264 | const struct ltq_pin_group *pin_grp = &info->grps[group]; |
265 | int i, pin, pin_func, ret; |
266 | |
267 | if (!pin_grp->npins || |
268 | (match_group_mux(grp: pin_grp, info, mux: pin_grp->mux) < 0)) { |
269 | dev_err(info->dev, "Failed to set the pin group: %s\n" , |
270 | info->grps[group].name); |
271 | return -EINVAL; |
272 | } |
273 | for (i = 0; i < pin_grp->npins; i++) { |
274 | pin = match_mfp(info, pin: pin_grp->pins[i]); |
275 | if (pin < 0) { |
276 | dev_err(info->dev, "could not find mfp for pin %d\n" , |
277 | pin_grp->pins[i]); |
278 | return -EINVAL; |
279 | } |
280 | pin_func = match_mux(mfp: &info->mfp[pin], mux: pin_grp->mux); |
281 | ret = info->apply_mux(pctrldev, pin, pin_func); |
282 | if (ret) { |
283 | dev_err(info->dev, |
284 | "failed to apply mux %d for pin %d\n" , |
285 | pin_func, pin); |
286 | return ret; |
287 | } |
288 | } |
289 | return 0; |
290 | } |
291 | |
292 | static int ltq_pmx_gpio_request_enable(struct pinctrl_dev *pctrldev, |
293 | struct pinctrl_gpio_range *range, |
294 | unsigned pin) |
295 | { |
296 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctldev: pctrldev); |
297 | int mfp = match_mfp(info, pin); |
298 | int pin_func; |
299 | |
300 | if (mfp < 0) { |
301 | dev_err(info->dev, "could not find mfp for pin %d\n" , pin); |
302 | return -EINVAL; |
303 | } |
304 | |
305 | pin_func = match_mux(mfp: &info->mfp[mfp], mux: 0); |
306 | if (pin_func < 0) { |
307 | dev_err(info->dev, "No GPIO function on pin%d\n" , mfp); |
308 | return -EINVAL; |
309 | } |
310 | |
311 | return info->apply_mux(pctrldev, mfp, pin_func); |
312 | } |
313 | |
314 | static const struct pinmux_ops ltq_pmx_ops = { |
315 | .get_functions_count = ltq_pmx_func_count, |
316 | .get_function_name = ltq_pmx_func_name, |
317 | .get_function_groups = ltq_pmx_get_groups, |
318 | .set_mux = ltq_pmx_set, |
319 | .gpio_request_enable = ltq_pmx_gpio_request_enable, |
320 | }; |
321 | |
322 | /* |
323 | * allow different socs to register with the generic part of the lanti |
324 | * pinctrl code |
325 | */ |
326 | int ltq_pinctrl_register(struct platform_device *pdev, |
327 | struct ltq_pinmux_info *info) |
328 | { |
329 | struct pinctrl_desc *desc; |
330 | |
331 | if (!info) |
332 | return -EINVAL; |
333 | desc = info->desc; |
334 | desc->pctlops = <q_pctrl_ops; |
335 | desc->pmxops = <q_pmx_ops; |
336 | info->dev = &pdev->dev; |
337 | |
338 | info->pctrl = devm_pinctrl_register(dev: &pdev->dev, pctldesc: desc, driver_data: info); |
339 | if (IS_ERR(ptr: info->pctrl)) { |
340 | dev_err(&pdev->dev, "failed to register LTQ pinmux driver\n" ); |
341 | return PTR_ERR(ptr: info->pctrl); |
342 | } |
343 | platform_set_drvdata(pdev, data: info); |
344 | return 0; |
345 | } |
346 | |