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7e8d9415 SH |
1 | /* |
2 | * Marvell MVEBU pinctrl core driver | |
3 | * | |
4 | * Authors: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> | |
5 | * Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | */ | |
12 | ||
13 | #include <linux/platform_device.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/io.h> | |
17 | #include <linux/of.h> | |
18 | #include <linux/of_address.h> | |
19 | #include <linux/of_platform.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/gpio.h> | |
22 | #include <linux/pinctrl/machine.h> | |
23 | #include <linux/pinctrl/pinconf.h> | |
24 | #include <linux/pinctrl/pinctrl.h> | |
25 | #include <linux/pinctrl/pinmux.h> | |
26 | ||
7e8d9415 SH |
27 | #include "pinctrl-mvebu.h" |
28 | ||
29 | #define MPPS_PER_REG 8 | |
30 | #define MPP_BITS 4 | |
31 | #define MPP_MASK 0xf | |
32 | ||
33 | struct mvebu_pinctrl_function { | |
34 | const char *name; | |
35 | const char **groups; | |
36 | unsigned num_groups; | |
37 | }; | |
38 | ||
39 | struct mvebu_pinctrl_group { | |
40 | const char *name; | |
41 | struct mvebu_mpp_ctrl *ctrl; | |
42 | struct mvebu_mpp_ctrl_setting *settings; | |
43 | unsigned num_settings; | |
44 | unsigned gid; | |
45 | unsigned *pins; | |
46 | unsigned npins; | |
47 | }; | |
48 | ||
49 | struct mvebu_pinctrl { | |
50 | struct device *dev; | |
51 | struct pinctrl_dev *pctldev; | |
52 | struct pinctrl_desc desc; | |
53 | void __iomem *base; | |
54 | struct mvebu_pinctrl_group *groups; | |
55 | unsigned num_groups; | |
56 | struct mvebu_pinctrl_function *functions; | |
57 | unsigned num_functions; | |
58 | u8 variant; | |
59 | }; | |
60 | ||
61 | static struct mvebu_pinctrl_group *mvebu_pinctrl_find_group_by_pid( | |
62 | struct mvebu_pinctrl *pctl, unsigned pid) | |
63 | { | |
64 | unsigned n; | |
65 | for (n = 0; n < pctl->num_groups; n++) { | |
66 | if (pid >= pctl->groups[n].pins[0] && | |
67 | pid < pctl->groups[n].pins[0] + | |
68 | pctl->groups[n].npins) | |
69 | return &pctl->groups[n]; | |
70 | } | |
71 | return NULL; | |
72 | } | |
73 | ||
74 | static struct mvebu_pinctrl_group *mvebu_pinctrl_find_group_by_name( | |
75 | struct mvebu_pinctrl *pctl, const char *name) | |
76 | { | |
77 | unsigned n; | |
78 | for (n = 0; n < pctl->num_groups; n++) { | |
79 | if (strcmp(name, pctl->groups[n].name) == 0) | |
80 | return &pctl->groups[n]; | |
81 | } | |
82 | return NULL; | |
83 | } | |
84 | ||
85 | static struct mvebu_mpp_ctrl_setting *mvebu_pinctrl_find_setting_by_val( | |
86 | struct mvebu_pinctrl *pctl, struct mvebu_pinctrl_group *grp, | |
87 | unsigned long config) | |
88 | { | |
89 | unsigned n; | |
90 | for (n = 0; n < grp->num_settings; n++) { | |
91 | if (config == grp->settings[n].val) { | |
92 | if (!pctl->variant || (pctl->variant & | |
93 | grp->settings[n].variant)) | |
94 | return &grp->settings[n]; | |
95 | } | |
96 | } | |
97 | return NULL; | |
98 | } | |
99 | ||
100 | static struct mvebu_mpp_ctrl_setting *mvebu_pinctrl_find_setting_by_name( | |
101 | struct mvebu_pinctrl *pctl, struct mvebu_pinctrl_group *grp, | |
102 | const char *name) | |
103 | { | |
104 | unsigned n; | |
105 | for (n = 0; n < grp->num_settings; n++) { | |
106 | if (strcmp(name, grp->settings[n].name) == 0) { | |
107 | if (!pctl->variant || (pctl->variant & | |
108 | grp->settings[n].variant)) | |
109 | return &grp->settings[n]; | |
110 | } | |
111 | } | |
112 | return NULL; | |
113 | } | |
114 | ||
115 | static struct mvebu_mpp_ctrl_setting *mvebu_pinctrl_find_gpio_setting( | |
116 | struct mvebu_pinctrl *pctl, struct mvebu_pinctrl_group *grp) | |
117 | { | |
118 | unsigned n; | |
119 | for (n = 0; n < grp->num_settings; n++) { | |
120 | if (grp->settings[n].flags & | |
121 | (MVEBU_SETTING_GPO | MVEBU_SETTING_GPI)) { | |
122 | if (!pctl->variant || (pctl->variant & | |
123 | grp->settings[n].variant)) | |
124 | return &grp->settings[n]; | |
125 | } | |
126 | } | |
127 | return NULL; | |
128 | } | |
129 | ||
130 | static struct mvebu_pinctrl_function *mvebu_pinctrl_find_function_by_name( | |
131 | struct mvebu_pinctrl *pctl, const char *name) | |
132 | { | |
133 | unsigned n; | |
134 | for (n = 0; n < pctl->num_functions; n++) { | |
135 | if (strcmp(name, pctl->functions[n].name) == 0) | |
136 | return &pctl->functions[n]; | |
137 | } | |
138 | return NULL; | |
139 | } | |
140 | ||
141 | /* | |
142 | * Common mpp pin configuration registers on MVEBU are | |
143 | * registers of eight 4-bit values for each mpp setting. | |
144 | * Register offset and bit mask are calculated accordingly below. | |
145 | */ | |
146 | static int mvebu_common_mpp_get(struct mvebu_pinctrl *pctl, | |
147 | struct mvebu_pinctrl_group *grp, | |
148 | unsigned long *config) | |
149 | { | |
150 | unsigned pin = grp->gid; | |
151 | unsigned off = (pin / MPPS_PER_REG) * MPP_BITS; | |
152 | unsigned shift = (pin % MPPS_PER_REG) * MPP_BITS; | |
153 | ||
154 | *config = readl(pctl->base + off); | |
155 | *config >>= shift; | |
156 | *config &= MPP_MASK; | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | static int mvebu_common_mpp_set(struct mvebu_pinctrl *pctl, | |
162 | struct mvebu_pinctrl_group *grp, | |
163 | unsigned long config) | |
164 | { | |
165 | unsigned pin = grp->gid; | |
166 | unsigned off = (pin / MPPS_PER_REG) * MPP_BITS; | |
167 | unsigned shift = (pin % MPPS_PER_REG) * MPP_BITS; | |
168 | unsigned long reg; | |
169 | ||
170 | reg = readl(pctl->base + off); | |
171 | reg &= ~(MPP_MASK << shift); | |
172 | reg |= (config << shift); | |
173 | writel(reg, pctl->base + off); | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | static int mvebu_pinconf_group_get(struct pinctrl_dev *pctldev, | |
179 | unsigned gid, unsigned long *config) | |
180 | { | |
181 | struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); | |
182 | struct mvebu_pinctrl_group *grp = &pctl->groups[gid]; | |
183 | ||
184 | if (!grp->ctrl) | |
185 | return -EINVAL; | |
186 | ||
187 | if (grp->ctrl->mpp_get) | |
188 | return grp->ctrl->mpp_get(grp->ctrl, config); | |
189 | ||
190 | return mvebu_common_mpp_get(pctl, grp, config); | |
191 | } | |
192 | ||
193 | static int mvebu_pinconf_group_set(struct pinctrl_dev *pctldev, | |
194 | unsigned gid, unsigned long config) | |
195 | { | |
196 | struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); | |
197 | struct mvebu_pinctrl_group *grp = &pctl->groups[gid]; | |
198 | ||
199 | if (!grp->ctrl) | |
200 | return -EINVAL; | |
201 | ||
202 | if (grp->ctrl->mpp_set) | |
203 | return grp->ctrl->mpp_set(grp->ctrl, config); | |
204 | ||
205 | return mvebu_common_mpp_set(pctl, grp, config); | |
206 | } | |
207 | ||
208 | static void mvebu_pinconf_group_dbg_show(struct pinctrl_dev *pctldev, | |
209 | struct seq_file *s, unsigned gid) | |
210 | { | |
211 | struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); | |
212 | struct mvebu_pinctrl_group *grp = &pctl->groups[gid]; | |
213 | struct mvebu_mpp_ctrl_setting *curr; | |
214 | unsigned long config; | |
215 | unsigned n; | |
216 | ||
217 | if (mvebu_pinconf_group_get(pctldev, gid, &config)) | |
218 | return; | |
219 | ||
220 | curr = mvebu_pinctrl_find_setting_by_val(pctl, grp, config); | |
221 | ||
222 | if (curr) { | |
223 | seq_printf(s, "current: %s", curr->name); | |
224 | if (curr->subname) | |
225 | seq_printf(s, "(%s)", curr->subname); | |
226 | if (curr->flags & (MVEBU_SETTING_GPO | MVEBU_SETTING_GPI)) { | |
227 | seq_printf(s, "("); | |
228 | if (curr->flags & MVEBU_SETTING_GPI) | |
229 | seq_printf(s, "i"); | |
230 | if (curr->flags & MVEBU_SETTING_GPO) | |
231 | seq_printf(s, "o"); | |
232 | seq_printf(s, ")"); | |
233 | } | |
234 | } else | |
235 | seq_printf(s, "current: UNKNOWN"); | |
236 | ||
237 | if (grp->num_settings > 1) { | |
238 | seq_printf(s, ", available = ["); | |
239 | for (n = 0; n < grp->num_settings; n++) { | |
240 | if (curr == &grp->settings[n]) | |
241 | continue; | |
242 | ||
243 | /* skip unsupported settings for this variant */ | |
244 | if (pctl->variant && | |
245 | !(pctl->variant & grp->settings[n].variant)) | |
246 | continue; | |
247 | ||
248 | seq_printf(s, " %s", grp->settings[n].name); | |
249 | if (grp->settings[n].subname) | |
250 | seq_printf(s, "(%s)", grp->settings[n].subname); | |
251 | if (grp->settings[n].flags & | |
252 | (MVEBU_SETTING_GPO | MVEBU_SETTING_GPI)) { | |
253 | seq_printf(s, "("); | |
254 | if (grp->settings[n].flags & MVEBU_SETTING_GPI) | |
255 | seq_printf(s, "i"); | |
256 | if (grp->settings[n].flags & MVEBU_SETTING_GPO) | |
257 | seq_printf(s, "o"); | |
258 | seq_printf(s, ")"); | |
259 | } | |
260 | } | |
261 | seq_printf(s, " ]"); | |
262 | } | |
263 | return; | |
264 | } | |
265 | ||
266 | static struct pinconf_ops mvebu_pinconf_ops = { | |
267 | .pin_config_group_get = mvebu_pinconf_group_get, | |
268 | .pin_config_group_set = mvebu_pinconf_group_set, | |
269 | .pin_config_group_dbg_show = mvebu_pinconf_group_dbg_show, | |
270 | }; | |
271 | ||
272 | static int mvebu_pinmux_get_funcs_count(struct pinctrl_dev *pctldev) | |
273 | { | |
274 | struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); | |
275 | ||
276 | return pctl->num_functions; | |
277 | } | |
278 | ||
279 | static const char *mvebu_pinmux_get_func_name(struct pinctrl_dev *pctldev, | |
280 | unsigned fid) | |
281 | { | |
282 | struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); | |
283 | ||
284 | return pctl->functions[fid].name; | |
285 | } | |
286 | ||
287 | static int mvebu_pinmux_get_groups(struct pinctrl_dev *pctldev, unsigned fid, | |
288 | const char * const **groups, | |
289 | unsigned * const num_groups) | |
290 | { | |
291 | struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); | |
292 | ||
293 | *groups = pctl->functions[fid].groups; | |
294 | *num_groups = pctl->functions[fid].num_groups; | |
295 | return 0; | |
296 | } | |
297 | ||
298 | static int mvebu_pinmux_enable(struct pinctrl_dev *pctldev, unsigned fid, | |
299 | unsigned gid) | |
300 | { | |
301 | struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); | |
302 | struct mvebu_pinctrl_function *func = &pctl->functions[fid]; | |
303 | struct mvebu_pinctrl_group *grp = &pctl->groups[gid]; | |
304 | struct mvebu_mpp_ctrl_setting *setting; | |
305 | int ret; | |
306 | ||
307 | setting = mvebu_pinctrl_find_setting_by_name(pctl, grp, | |
308 | func->name); | |
309 | if (!setting) { | |
310 | dev_err(pctl->dev, | |
311 | "unable to find setting %s in group %s\n", | |
312 | func->name, func->groups[gid]); | |
313 | return -EINVAL; | |
314 | } | |
315 | ||
316 | ret = mvebu_pinconf_group_set(pctldev, grp->gid, setting->val); | |
317 | if (ret) { | |
318 | dev_err(pctl->dev, "cannot set group %s to %s\n", | |
319 | func->groups[gid], func->name); | |
320 | return ret; | |
321 | } | |
322 | ||
323 | return 0; | |
324 | } | |
325 | ||
326 | static int mvebu_pinmux_gpio_request_enable(struct pinctrl_dev *pctldev, | |
327 | struct pinctrl_gpio_range *range, unsigned offset) | |
328 | { | |
329 | struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); | |
330 | struct mvebu_pinctrl_group *grp; | |
331 | struct mvebu_mpp_ctrl_setting *setting; | |
332 | ||
333 | grp = mvebu_pinctrl_find_group_by_pid(pctl, offset); | |
334 | if (!grp) | |
335 | return -EINVAL; | |
336 | ||
337 | if (grp->ctrl->mpp_gpio_req) | |
338 | return grp->ctrl->mpp_gpio_req(grp->ctrl, offset); | |
339 | ||
340 | setting = mvebu_pinctrl_find_gpio_setting(pctl, grp); | |
341 | if (!setting) | |
342 | return -ENOTSUPP; | |
343 | ||
344 | return mvebu_pinconf_group_set(pctldev, grp->gid, setting->val); | |
345 | } | |
346 | ||
347 | static int mvebu_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev, | |
348 | struct pinctrl_gpio_range *range, unsigned offset, bool input) | |
349 | { | |
350 | struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); | |
351 | struct mvebu_pinctrl_group *grp; | |
352 | struct mvebu_mpp_ctrl_setting *setting; | |
353 | ||
354 | grp = mvebu_pinctrl_find_group_by_pid(pctl, offset); | |
355 | if (!grp) | |
356 | return -EINVAL; | |
357 | ||
358 | if (grp->ctrl->mpp_gpio_dir) | |
359 | return grp->ctrl->mpp_gpio_dir(grp->ctrl, offset, input); | |
360 | ||
361 | setting = mvebu_pinctrl_find_gpio_setting(pctl, grp); | |
362 | if (!setting) | |
363 | return -ENOTSUPP; | |
364 | ||
365 | if ((input && (setting->flags & MVEBU_SETTING_GPI)) || | |
366 | (!input && (setting->flags & MVEBU_SETTING_GPO))) | |
367 | return 0; | |
368 | ||
369 | return -ENOTSUPP; | |
370 | } | |
371 | ||
372 | static struct pinmux_ops mvebu_pinmux_ops = { | |
373 | .get_functions_count = mvebu_pinmux_get_funcs_count, | |
374 | .get_function_name = mvebu_pinmux_get_func_name, | |
375 | .get_function_groups = mvebu_pinmux_get_groups, | |
376 | .gpio_request_enable = mvebu_pinmux_gpio_request_enable, | |
377 | .gpio_set_direction = mvebu_pinmux_gpio_set_direction, | |
378 | .enable = mvebu_pinmux_enable, | |
379 | }; | |
380 | ||
381 | static int mvebu_pinctrl_get_groups_count(struct pinctrl_dev *pctldev) | |
382 | { | |
383 | struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); | |
384 | return pctl->num_groups; | |
385 | } | |
386 | ||
387 | static const char *mvebu_pinctrl_get_group_name(struct pinctrl_dev *pctldev, | |
388 | unsigned gid) | |
389 | { | |
390 | struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); | |
391 | return pctl->groups[gid].name; | |
392 | } | |
393 | ||
394 | static int mvebu_pinctrl_get_group_pins(struct pinctrl_dev *pctldev, | |
395 | unsigned gid, const unsigned **pins, | |
396 | unsigned *num_pins) | |
397 | { | |
398 | struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); | |
399 | *pins = pctl->groups[gid].pins; | |
400 | *num_pins = pctl->groups[gid].npins; | |
401 | return 0; | |
402 | } | |
403 | ||
404 | static int mvebu_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev, | |
405 | struct device_node *np, | |
406 | struct pinctrl_map **map, | |
407 | unsigned *num_maps) | |
408 | { | |
409 | struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); | |
410 | struct property *prop; | |
411 | const char *function; | |
412 | const char *group; | |
413 | int ret, nmaps, n; | |
414 | ||
415 | *map = NULL; | |
416 | *num_maps = 0; | |
417 | ||
418 | ret = of_property_read_string(np, "marvell,function", &function); | |
419 | if (ret) { | |
420 | dev_err(pctl->dev, | |
421 | "missing marvell,function in node %s\n", np->name); | |
422 | return 0; | |
423 | } | |
424 | ||
425 | nmaps = of_property_count_strings(np, "marvell,pins"); | |
426 | if (nmaps < 0) { | |
427 | dev_err(pctl->dev, | |
428 | "missing marvell,pins in node %s\n", np->name); | |
429 | return 0; | |
430 | } | |
431 | ||
432 | *map = kmalloc(nmaps * sizeof(struct pinctrl_map), GFP_KERNEL); | |
433 | if (map == NULL) { | |
434 | dev_err(pctl->dev, | |
435 | "cannot allocate pinctrl_map memory for %s\n", | |
436 | np->name); | |
437 | return -ENOMEM; | |
438 | } | |
439 | ||
440 | n = 0; | |
441 | of_property_for_each_string(np, "marvell,pins", prop, group) { | |
442 | struct mvebu_pinctrl_group *grp = | |
443 | mvebu_pinctrl_find_group_by_name(pctl, group); | |
444 | ||
445 | if (!grp) { | |
446 | dev_err(pctl->dev, "unknown pin %s", group); | |
447 | continue; | |
448 | } | |
449 | ||
450 | if (!mvebu_pinctrl_find_setting_by_name(pctl, grp, function)) { | |
451 | dev_err(pctl->dev, "unsupported function %s on pin %s", | |
452 | function, group); | |
453 | continue; | |
454 | } | |
455 | ||
456 | (*map)[n].type = PIN_MAP_TYPE_MUX_GROUP; | |
457 | (*map)[n].data.mux.group = group; | |
458 | (*map)[n].data.mux.function = function; | |
459 | n++; | |
460 | } | |
461 | ||
462 | *num_maps = nmaps; | |
463 | ||
464 | return 0; | |
465 | } | |
466 | ||
467 | static void mvebu_pinctrl_dt_free_map(struct pinctrl_dev *pctldev, | |
468 | struct pinctrl_map *map, unsigned num_maps) | |
469 | { | |
470 | kfree(map); | |
471 | } | |
472 | ||
473 | static struct pinctrl_ops mvebu_pinctrl_ops = { | |
474 | .get_groups_count = mvebu_pinctrl_get_groups_count, | |
475 | .get_group_name = mvebu_pinctrl_get_group_name, | |
476 | .get_group_pins = mvebu_pinctrl_get_group_pins, | |
477 | .dt_node_to_map = mvebu_pinctrl_dt_node_to_map, | |
478 | .dt_free_map = mvebu_pinctrl_dt_free_map, | |
479 | }; | |
480 | ||
150632b0 | 481 | static int _add_function(struct mvebu_pinctrl_function *funcs, const char *name) |
7e8d9415 SH |
482 | { |
483 | while (funcs->num_groups) { | |
484 | /* function already there */ | |
485 | if (strcmp(funcs->name, name) == 0) { | |
486 | funcs->num_groups++; | |
487 | return -EEXIST; | |
488 | } | |
489 | funcs++; | |
490 | } | |
491 | funcs->name = name; | |
492 | funcs->num_groups = 1; | |
493 | return 0; | |
494 | } | |
495 | ||
150632b0 GKH |
496 | static int mvebu_pinctrl_build_functions(struct platform_device *pdev, |
497 | struct mvebu_pinctrl *pctl) | |
7e8d9415 SH |
498 | { |
499 | struct mvebu_pinctrl_function *funcs; | |
500 | int num = 0; | |
501 | int n, s; | |
502 | ||
503 | /* we allocate functions for number of pins and hope | |
504 | * there are less unique functions than pins available */ | |
505 | funcs = devm_kzalloc(&pdev->dev, pctl->desc.npins * | |
506 | sizeof(struct mvebu_pinctrl_function), GFP_KERNEL); | |
507 | if (!funcs) | |
508 | return -ENOMEM; | |
509 | ||
510 | for (n = 0; n < pctl->num_groups; n++) { | |
511 | struct mvebu_pinctrl_group *grp = &pctl->groups[n]; | |
512 | for (s = 0; s < grp->num_settings; s++) { | |
513 | /* skip unsupported settings on this variant */ | |
514 | if (pctl->variant && | |
515 | !(pctl->variant & grp->settings[s].variant)) | |
516 | continue; | |
517 | ||
518 | /* check for unique functions and count groups */ | |
519 | if (_add_function(funcs, grp->settings[s].name)) | |
520 | continue; | |
521 | ||
522 | num++; | |
523 | } | |
524 | } | |
525 | ||
526 | /* with the number of unique functions and it's groups known, | |
527 | reallocate functions and assign group names */ | |
528 | funcs = krealloc(funcs, num * sizeof(struct mvebu_pinctrl_function), | |
529 | GFP_KERNEL); | |
530 | if (!funcs) | |
531 | return -ENOMEM; | |
532 | ||
533 | pctl->num_functions = num; | |
534 | pctl->functions = funcs; | |
535 | ||
536 | for (n = 0; n < pctl->num_groups; n++) { | |
537 | struct mvebu_pinctrl_group *grp = &pctl->groups[n]; | |
538 | for (s = 0; s < grp->num_settings; s++) { | |
539 | struct mvebu_pinctrl_function *f; | |
540 | const char **groups; | |
541 | ||
542 | /* skip unsupported settings on this variant */ | |
543 | if (pctl->variant && | |
544 | !(pctl->variant & grp->settings[s].variant)) | |
545 | continue; | |
546 | ||
547 | f = mvebu_pinctrl_find_function_by_name(pctl, | |
548 | grp->settings[s].name); | |
549 | ||
550 | /* allocate group name array if not done already */ | |
551 | if (!f->groups) { | |
552 | f->groups = devm_kzalloc(&pdev->dev, | |
553 | f->num_groups * sizeof(char *), | |
554 | GFP_KERNEL); | |
555 | if (!f->groups) | |
556 | return -ENOMEM; | |
557 | } | |
558 | ||
559 | /* find next free group name and assign current name */ | |
560 | groups = f->groups; | |
561 | while (*groups) | |
562 | groups++; | |
563 | *groups = grp->name; | |
564 | } | |
565 | } | |
566 | ||
567 | return 0; | |
568 | } | |
569 | ||
150632b0 | 570 | int mvebu_pinctrl_probe(struct platform_device *pdev) |
7e8d9415 SH |
571 | { |
572 | struct mvebu_pinctrl_soc_info *soc = dev_get_platdata(&pdev->dev); | |
573 | struct device_node *np = pdev->dev.of_node; | |
574 | struct mvebu_pinctrl *pctl; | |
575 | void __iomem *base; | |
576 | struct pinctrl_pin_desc *pdesc; | |
577 | unsigned gid, n, k; | |
578 | int ret; | |
579 | ||
580 | if (!soc || !soc->controls || !soc->modes) { | |
581 | dev_err(&pdev->dev, "wrong pinctrl soc info\n"); | |
582 | return -EINVAL; | |
583 | } | |
584 | ||
585 | base = of_iomap(np, 0); | |
586 | if (!base) { | |
587 | dev_err(&pdev->dev, "unable to get base address\n"); | |
588 | return -ENODEV; | |
589 | } | |
590 | ||
591 | pctl = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_pinctrl), | |
592 | GFP_KERNEL); | |
593 | if (!pctl) { | |
594 | dev_err(&pdev->dev, "unable to alloc driver\n"); | |
595 | return -ENOMEM; | |
596 | } | |
597 | ||
598 | pctl->desc.name = dev_name(&pdev->dev); | |
599 | pctl->desc.owner = THIS_MODULE; | |
600 | pctl->desc.pctlops = &mvebu_pinctrl_ops; | |
601 | pctl->desc.pmxops = &mvebu_pinmux_ops; | |
602 | pctl->desc.confops = &mvebu_pinconf_ops; | |
603 | pctl->variant = soc->variant; | |
604 | pctl->base = base; | |
605 | pctl->dev = &pdev->dev; | |
606 | platform_set_drvdata(pdev, pctl); | |
607 | ||
608 | /* count controls and create names for mvebu generic | |
609 | register controls; also does sanity checks */ | |
610 | pctl->num_groups = 0; | |
611 | pctl->desc.npins = 0; | |
612 | for (n = 0; n < soc->ncontrols; n++) { | |
613 | struct mvebu_mpp_ctrl *ctrl = &soc->controls[n]; | |
614 | char *names; | |
615 | ||
616 | pctl->desc.npins += ctrl->npins; | |
617 | /* initial control pins */ | |
618 | for (k = 0; k < ctrl->npins; k++) | |
619 | ctrl->pins[k] = ctrl->pid + k; | |
620 | ||
621 | /* special soc specific control */ | |
622 | if (ctrl->mpp_get || ctrl->mpp_set) { | |
623 | if (!ctrl->name || !ctrl->mpp_set || !ctrl->mpp_set) { | |
624 | dev_err(&pdev->dev, "wrong soc control info\n"); | |
625 | return -EINVAL; | |
626 | } | |
627 | pctl->num_groups += 1; | |
628 | continue; | |
629 | } | |
630 | ||
631 | /* generic mvebu register control */ | |
632 | names = devm_kzalloc(&pdev->dev, ctrl->npins * 8, GFP_KERNEL); | |
633 | if (!names) { | |
634 | dev_err(&pdev->dev, "failed to alloc mpp names\n"); | |
635 | return -ENOMEM; | |
636 | } | |
637 | for (k = 0; k < ctrl->npins; k++) | |
638 | sprintf(names + 8*k, "mpp%d", ctrl->pid+k); | |
639 | ctrl->name = names; | |
640 | pctl->num_groups += ctrl->npins; | |
641 | } | |
642 | ||
643 | pdesc = devm_kzalloc(&pdev->dev, pctl->desc.npins * | |
644 | sizeof(struct pinctrl_pin_desc), GFP_KERNEL); | |
645 | if (!pdesc) { | |
646 | dev_err(&pdev->dev, "failed to alloc pinctrl pins\n"); | |
647 | return -ENOMEM; | |
648 | } | |
649 | ||
650 | for (n = 0; n < pctl->desc.npins; n++) | |
651 | pdesc[n].number = n; | |
652 | pctl->desc.pins = pdesc; | |
653 | ||
654 | pctl->groups = devm_kzalloc(&pdev->dev, pctl->num_groups * | |
655 | sizeof(struct mvebu_pinctrl_group), GFP_KERNEL); | |
656 | if (!pctl->groups) { | |
657 | dev_err(&pdev->dev, "failed to alloc pinctrl groups\n"); | |
658 | return -ENOMEM; | |
659 | } | |
660 | ||
661 | /* assign mpp controls to groups */ | |
662 | gid = 0; | |
663 | for (n = 0; n < soc->ncontrols; n++) { | |
664 | struct mvebu_mpp_ctrl *ctrl = &soc->controls[n]; | |
665 | pctl->groups[gid].gid = gid; | |
666 | pctl->groups[gid].ctrl = ctrl; | |
667 | pctl->groups[gid].name = ctrl->name; | |
668 | pctl->groups[gid].pins = ctrl->pins; | |
669 | pctl->groups[gid].npins = ctrl->npins; | |
670 | ||
671 | /* generic mvebu register control maps to a number of groups */ | |
672 | if (!ctrl->mpp_get && !ctrl->mpp_set) { | |
673 | pctl->groups[gid].npins = 1; | |
674 | ||
675 | for (k = 1; k < ctrl->npins; k++) { | |
676 | gid++; | |
677 | pctl->groups[gid].gid = gid; | |
678 | pctl->groups[gid].ctrl = ctrl; | |
679 | pctl->groups[gid].name = &ctrl->name[8*k]; | |
680 | pctl->groups[gid].pins = &ctrl->pins[k]; | |
681 | pctl->groups[gid].npins = 1; | |
682 | } | |
683 | } | |
684 | gid++; | |
685 | } | |
686 | ||
687 | /* assign mpp modes to groups */ | |
688 | for (n = 0; n < soc->nmodes; n++) { | |
689 | struct mvebu_mpp_mode *mode = &soc->modes[n]; | |
690 | struct mvebu_pinctrl_group *grp = | |
691 | mvebu_pinctrl_find_group_by_pid(pctl, mode->pid); | |
692 | unsigned num_settings; | |
693 | ||
694 | if (!grp) { | |
695 | dev_warn(&pdev->dev, "unknown pinctrl group %d\n", | |
696 | mode->pid); | |
697 | continue; | |
698 | } | |
699 | ||
700 | for (num_settings = 0; ;) { | |
701 | struct mvebu_mpp_ctrl_setting *set = | |
702 | &mode->settings[num_settings]; | |
703 | ||
704 | if (!set->name) | |
705 | break; | |
706 | num_settings++; | |
707 | ||
708 | /* skip unsupported settings for this variant */ | |
709 | if (pctl->variant && !(pctl->variant & set->variant)) | |
710 | continue; | |
711 | ||
712 | /* find gpio/gpo/gpi settings */ | |
713 | if (strcmp(set->name, "gpio") == 0) | |
714 | set->flags = MVEBU_SETTING_GPI | | |
715 | MVEBU_SETTING_GPO; | |
716 | else if (strcmp(set->name, "gpo") == 0) | |
717 | set->flags = MVEBU_SETTING_GPO; | |
718 | else if (strcmp(set->name, "gpi") == 0) | |
719 | set->flags = MVEBU_SETTING_GPI; | |
720 | } | |
721 | ||
722 | grp->settings = mode->settings; | |
723 | grp->num_settings = num_settings; | |
724 | } | |
725 | ||
726 | ret = mvebu_pinctrl_build_functions(pdev, pctl); | |
727 | if (ret) { | |
728 | dev_err(&pdev->dev, "unable to build functions\n"); | |
729 | return ret; | |
730 | } | |
731 | ||
732 | pctl->pctldev = pinctrl_register(&pctl->desc, &pdev->dev, pctl); | |
733 | if (!pctl->pctldev) { | |
734 | dev_err(&pdev->dev, "unable to register pinctrl driver\n"); | |
735 | return -EINVAL; | |
736 | } | |
737 | ||
738 | dev_info(&pdev->dev, "registered pinctrl driver\n"); | |
739 | ||
740 | /* register gpio ranges */ | |
741 | for (n = 0; n < soc->ngpioranges; n++) | |
742 | pinctrl_add_gpio_range(pctl->pctldev, &soc->gpioranges[n]); | |
743 | ||
744 | return 0; | |
745 | } | |
746 | ||
150632b0 | 747 | int mvebu_pinctrl_remove(struct platform_device *pdev) |
7e8d9415 SH |
748 | { |
749 | struct mvebu_pinctrl *pctl = platform_get_drvdata(pdev); | |
750 | pinctrl_unregister(pctl->pctldev); | |
751 | return 0; | |
752 | } |