1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Marvell MVEBU pinctrl core driver
4  *
5  * Authors: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
6  *          Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
7  */
8 
9 #include <linux/err.h>
10 #include <linux/gpio/driver.h>
11 #include <linux/io.h>
12 #include <linux/mfd/syscon.h>
13 #include <linux/of.h>
14 #include <linux/platform_device.h>
15 #include <linux/regmap.h>
16 #include <linux/seq_file.h>
17 #include <linux/slab.h>
18 
19 #include <linux/pinctrl/machine.h>
20 #include <linux/pinctrl/pinconf.h>
21 #include <linux/pinctrl/pinctrl.h>
22 #include <linux/pinctrl/pinmux.h>
23 
24 #include "pinctrl-mvebu.h"
25 
26 #define MPPS_PER_REG	8
27 #define MPP_BITS	4
28 #define MPP_MASK	0xf
29 
30 struct mvebu_pinctrl_function {
31 	const char *name;
32 	const char **groups;
33 	unsigned num_groups;
34 };
35 
36 struct mvebu_pinctrl_group {
37 	const char *name;
38 	const struct mvebu_mpp_ctrl *ctrl;
39 	struct mvebu_mpp_ctrl_data *data;
40 	struct mvebu_mpp_ctrl_setting *settings;
41 	unsigned num_settings;
42 	unsigned gid;
43 	unsigned *pins;
44 	unsigned npins;
45 };
46 
47 struct mvebu_pinctrl {
48 	struct device *dev;
49 	struct pinctrl_dev *pctldev;
50 	struct pinctrl_desc desc;
51 	struct mvebu_pinctrl_group *groups;
52 	unsigned num_groups;
53 	struct mvebu_pinctrl_function *functions;
54 	unsigned num_functions;
55 	u8 variant;
56 };
57 
58 int mvebu_mmio_mpp_ctrl_get(struct mvebu_mpp_ctrl_data *data,
59 			     unsigned int pid, unsigned long *config)
60 {
61 	unsigned off = (pid / MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
62 	unsigned shift = (pid % MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
63 
64 	*config = (readl(data->base + off) >> shift) & MVEBU_MPP_MASK;
65 
66 	return 0;
67 }
68 
69 int mvebu_mmio_mpp_ctrl_set(struct mvebu_mpp_ctrl_data *data,
70 			     unsigned int pid, unsigned long config)
71 {
72 	unsigned off = (pid / MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
73 	unsigned shift = (pid % MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
74 	unsigned long reg;
75 
76 	reg = readl(data->base + off) & ~(MVEBU_MPP_MASK << shift);
77 	writel(reg | (config << shift), data->base + off);
78 
79 	return 0;
80 }
81 
82 static struct mvebu_pinctrl_group *mvebu_pinctrl_find_group_by_pid(
83 	struct mvebu_pinctrl *pctl, unsigned pid)
84 {
85 	unsigned n;
86 	for (n = 0; n < pctl->num_groups; n++) {
87 		if (pid >= pctl->groups[n].pins[0] &&
88 		    pid < pctl->groups[n].pins[0] +
89 			pctl->groups[n].npins)
90 			return &pctl->groups[n];
91 	}
92 	return NULL;
93 }
94 
95 static struct mvebu_pinctrl_group *mvebu_pinctrl_find_group_by_name(
96 	struct mvebu_pinctrl *pctl, const char *name)
97 {
98 	unsigned n;
99 
100 	for (n = 0; n < pctl->num_groups; n++) {
101 		if (strcmp(name, pctl->groups[n].name) == 0)
102 			return &pctl->groups[n];
103 	}
104 
105 	return NULL;
106 }
107 
108 static struct mvebu_mpp_ctrl_setting *mvebu_pinctrl_find_setting_by_val(
109 	struct mvebu_pinctrl *pctl, struct mvebu_pinctrl_group *grp,
110 	unsigned long config)
111 {
112 	unsigned n;
113 
114 	for (n = 0; n < grp->num_settings; n++) {
115 		if (config == grp->settings[n].val) {
116 			if (!pctl->variant || (pctl->variant &
117 					       grp->settings[n].variant))
118 				return &grp->settings[n];
119 		}
120 	}
121 
122 	return NULL;
123 }
124 
125 static struct mvebu_mpp_ctrl_setting *mvebu_pinctrl_find_setting_by_name(
126 	struct mvebu_pinctrl *pctl, struct mvebu_pinctrl_group *grp,
127 	const char *name)
128 {
129 	unsigned n;
130 
131 	for (n = 0; n < grp->num_settings; n++) {
132 		if (strcmp(name, grp->settings[n].name) == 0) {
133 			if (!pctl->variant || (pctl->variant &
134 					       grp->settings[n].variant))
135 				return &grp->settings[n];
136 		}
137 	}
138 
139 	return NULL;
140 }
141 
142 static struct mvebu_mpp_ctrl_setting *mvebu_pinctrl_find_gpio_setting(
143 	struct mvebu_pinctrl *pctl, struct mvebu_pinctrl_group *grp)
144 {
145 	unsigned n;
146 
147 	for (n = 0; n < grp->num_settings; n++) {
148 		if (grp->settings[n].flags &
149 			(MVEBU_SETTING_GPO | MVEBU_SETTING_GPI)) {
150 			if (!pctl->variant || (pctl->variant &
151 						grp->settings[n].variant))
152 				return &grp->settings[n];
153 		}
154 	}
155 
156 	return NULL;
157 }
158 
159 static struct mvebu_pinctrl_function *mvebu_pinctrl_find_function_by_name(
160 	struct mvebu_pinctrl *pctl, const char *name)
161 {
162 	unsigned n;
163 
164 	for (n = 0; n < pctl->num_functions; n++) {
165 		if (strcmp(name, pctl->functions[n].name) == 0)
166 			return &pctl->functions[n];
167 	}
168 
169 	return NULL;
170 }
171 
172 static int mvebu_pinconf_group_get(struct pinctrl_dev *pctldev,
173 				unsigned gid, unsigned long *config)
174 {
175 	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
176 	struct mvebu_pinctrl_group *grp = &pctl->groups[gid];
177 
178 	if (!grp->ctrl)
179 		return -EINVAL;
180 
181 	return grp->ctrl->mpp_get(grp->data, grp->pins[0], config);
182 }
183 
184 static int mvebu_pinconf_group_set(struct pinctrl_dev *pctldev,
185 				unsigned gid, unsigned long *configs,
186 				unsigned num_configs)
187 {
188 	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
189 	struct mvebu_pinctrl_group *grp = &pctl->groups[gid];
190 	int i, ret;
191 
192 	if (!grp->ctrl)
193 		return -EINVAL;
194 
195 	for (i = 0; i < num_configs; i++) {
196 		ret = grp->ctrl->mpp_set(grp->data, grp->pins[0], configs[i]);
197 		if (ret)
198 			return ret;
199 	} /* for each config */
200 
201 	return 0;
202 }
203 
204 static void mvebu_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
205 					struct seq_file *s, unsigned gid)
206 {
207 	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
208 	struct mvebu_pinctrl_group *grp = &pctl->groups[gid];
209 	struct mvebu_mpp_ctrl_setting *curr;
210 	unsigned long config;
211 	unsigned n;
212 
213 	if (mvebu_pinconf_group_get(pctldev, gid, &config))
214 		return;
215 
216 	curr = mvebu_pinctrl_find_setting_by_val(pctl, grp, config);
217 
218 	if (curr) {
219 		seq_printf(s, "current: %s", curr->name);
220 		if (curr->subname)
221 			seq_printf(s, "(%s)", curr->subname);
222 		if (curr->flags & (MVEBU_SETTING_GPO | MVEBU_SETTING_GPI)) {
223 			seq_putc(s, '(');
224 			if (curr->flags & MVEBU_SETTING_GPI)
225 				seq_putc(s, 'i');
226 			if (curr->flags & MVEBU_SETTING_GPO)
227 				seq_putc(s, 'o');
228 			seq_putc(s, ')');
229 		}
230 	} else {
231 		seq_puts(s, "current: UNKNOWN");
232 	}
233 
234 	if (grp->num_settings > 1) {
235 		seq_puts(s, ", available = [");
236 		for (n = 0; n < grp->num_settings; n++) {
237 			if (curr == &grp->settings[n])
238 				continue;
239 
240 			/* skip unsupported settings for this variant */
241 			if (pctl->variant &&
242 			    !(pctl->variant & grp->settings[n].variant))
243 				continue;
244 
245 			seq_printf(s, " %s", grp->settings[n].name);
246 			if (grp->settings[n].subname)
247 				seq_printf(s, "(%s)", grp->settings[n].subname);
248 			if (grp->settings[n].flags &
249 				(MVEBU_SETTING_GPO | MVEBU_SETTING_GPI)) {
250 				seq_putc(s, '(');
251 				if (grp->settings[n].flags & MVEBU_SETTING_GPI)
252 					seq_putc(s, 'i');
253 				if (grp->settings[n].flags & MVEBU_SETTING_GPO)
254 					seq_putc(s, 'o');
255 				seq_putc(s, ')');
256 			}
257 		}
258 		seq_puts(s, " ]");
259 	}
260 }
261 
262 static const struct pinconf_ops mvebu_pinconf_ops = {
263 	.pin_config_group_get = mvebu_pinconf_group_get,
264 	.pin_config_group_set = mvebu_pinconf_group_set,
265 	.pin_config_group_dbg_show = mvebu_pinconf_group_dbg_show,
266 };
267 
268 static int mvebu_pinmux_get_funcs_count(struct pinctrl_dev *pctldev)
269 {
270 	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
271 
272 	return pctl->num_functions;
273 }
274 
275 static const char *mvebu_pinmux_get_func_name(struct pinctrl_dev *pctldev,
276 					unsigned fid)
277 {
278 	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
279 
280 	return pctl->functions[fid].name;
281 }
282 
283 static int mvebu_pinmux_get_groups(struct pinctrl_dev *pctldev, unsigned fid,
284 				const char * const **groups,
285 				unsigned * const num_groups)
286 {
287 	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
288 
289 	*groups = pctl->functions[fid].groups;
290 	*num_groups = pctl->functions[fid].num_groups;
291 	return 0;
292 }
293 
294 static int mvebu_pinmux_set(struct pinctrl_dev *pctldev, unsigned fid,
295 			    unsigned gid)
296 {
297 	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
298 	struct mvebu_pinctrl_function *func = &pctl->functions[fid];
299 	struct mvebu_pinctrl_group *grp = &pctl->groups[gid];
300 	struct mvebu_mpp_ctrl_setting *setting;
301 	int ret;
302 	unsigned long config;
303 
304 	setting = mvebu_pinctrl_find_setting_by_name(pctl, grp,
305 						     func->name);
306 	if (!setting) {
307 		dev_err(pctl->dev,
308 			"unable to find setting %s in group %s\n",
309 			func->name, func->groups[gid]);
310 		return -EINVAL;
311 	}
312 
313 	config = setting->val;
314 	ret = mvebu_pinconf_group_set(pctldev, grp->gid, &config, 1);
315 	if (ret) {
316 		dev_err(pctl->dev, "cannot set group %s to %s\n",
317 			func->groups[gid], func->name);
318 		return ret;
319 	}
320 
321 	return 0;
322 }
323 
324 static int mvebu_pinmux_gpio_request_enable(struct pinctrl_dev *pctldev,
325 			struct pinctrl_gpio_range *range, unsigned offset)
326 {
327 	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
328 	struct mvebu_pinctrl_group *grp;
329 	struct mvebu_mpp_ctrl_setting *setting;
330 	unsigned long config;
331 
332 	grp = mvebu_pinctrl_find_group_by_pid(pctl, offset);
333 	if (!grp)
334 		return -EINVAL;
335 
336 	if (grp->ctrl->mpp_gpio_req)
337 		return grp->ctrl->mpp_gpio_req(grp->data, offset);
338 
339 	setting = mvebu_pinctrl_find_gpio_setting(pctl, grp);
340 	if (!setting)
341 		return -ENOTSUPP;
342 
343 	config = setting->val;
344 
345 	return mvebu_pinconf_group_set(pctldev, grp->gid, &config, 1);
346 }
347 
348 static int mvebu_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
349 	   struct pinctrl_gpio_range *range, unsigned offset, bool input)
350 {
351 	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
352 	struct mvebu_pinctrl_group *grp;
353 	struct mvebu_mpp_ctrl_setting *setting;
354 
355 	grp = mvebu_pinctrl_find_group_by_pid(pctl, offset);
356 	if (!grp)
357 		return -EINVAL;
358 
359 	if (grp->ctrl->mpp_gpio_dir)
360 		return grp->ctrl->mpp_gpio_dir(grp->data, offset, input);
361 
362 	setting = mvebu_pinctrl_find_gpio_setting(pctl, grp);
363 	if (!setting)
364 		return -ENOTSUPP;
365 
366 	if ((input && (setting->flags & MVEBU_SETTING_GPI)) ||
367 	    (!input && (setting->flags & MVEBU_SETTING_GPO)))
368 		return 0;
369 
370 	return -ENOTSUPP;
371 }
372 
373 static const struct pinmux_ops mvebu_pinmux_ops = {
374 	.get_functions_count = mvebu_pinmux_get_funcs_count,
375 	.get_function_name = mvebu_pinmux_get_func_name,
376 	.get_function_groups = mvebu_pinmux_get_groups,
377 	.gpio_request_enable = mvebu_pinmux_gpio_request_enable,
378 	.gpio_set_direction = mvebu_pinmux_gpio_set_direction,
379 	.set_mux = mvebu_pinmux_set,
380 };
381 
382 static int mvebu_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
383 {
384 	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
385 	return pctl->num_groups;
386 }
387 
388 static const char *mvebu_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
389 						unsigned gid)
390 {
391 	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
392 	return pctl->groups[gid].name;
393 }
394 
395 static int mvebu_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
396 					unsigned gid, const unsigned **pins,
397 					unsigned *num_pins)
398 {
399 	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
400 	*pins = pctl->groups[gid].pins;
401 	*num_pins = pctl->groups[gid].npins;
402 	return 0;
403 }
404 
405 static int mvebu_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
406 					struct device_node *np,
407 					struct pinctrl_map **map,
408 					unsigned *num_maps)
409 {
410 	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
411 	struct property *prop;
412 	const char *function;
413 	const char *group;
414 	int ret, nmaps, n;
415 
416 	*map = NULL;
417 	*num_maps = 0;
418 
419 	ret = of_property_read_string(np, "marvell,function", &function);
420 	if (ret) {
421 		dev_err(pctl->dev,
422 			"missing marvell,function in node %pOFn\n", np);
423 		return 0;
424 	}
425 
426 	nmaps = of_property_count_strings(np, "marvell,pins");
427 	if (nmaps < 0) {
428 		dev_err(pctl->dev,
429 			"missing marvell,pins in node %pOFn\n", np);
430 		return 0;
431 	}
432 
433 	*map = kmalloc_array(nmaps, sizeof(**map), GFP_KERNEL);
434 	if (!*map)
435 		return -ENOMEM;
436 
437 	n = 0;
438 	of_property_for_each_string(np, "marvell,pins", prop, group) {
439 		struct mvebu_pinctrl_group *grp =
440 			mvebu_pinctrl_find_group_by_name(pctl, group);
441 
442 		if (!grp) {
443 			dev_err(pctl->dev, "unknown pin %s", group);
444 			continue;
445 		}
446 
447 		if (!mvebu_pinctrl_find_setting_by_name(pctl, grp, function)) {
448 			dev_err(pctl->dev, "unsupported function %s on pin %s",
449 				function, group);
450 			continue;
451 		}
452 
453 		(*map)[n].type = PIN_MAP_TYPE_MUX_GROUP;
454 		(*map)[n].data.mux.group = group;
455 		(*map)[n].data.mux.function = function;
456 		n++;
457 	}
458 
459 	*num_maps = nmaps;
460 
461 	return 0;
462 }
463 
464 static void mvebu_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
465 				struct pinctrl_map *map, unsigned num_maps)
466 {
467 	kfree(map);
468 }
469 
470 static const struct pinctrl_ops mvebu_pinctrl_ops = {
471 	.get_groups_count = mvebu_pinctrl_get_groups_count,
472 	.get_group_name = mvebu_pinctrl_get_group_name,
473 	.get_group_pins = mvebu_pinctrl_get_group_pins,
474 	.dt_node_to_map = mvebu_pinctrl_dt_node_to_map,
475 	.dt_free_map = mvebu_pinctrl_dt_free_map,
476 };
477 
478 static int _add_function(struct mvebu_pinctrl_function *funcs, int *funcsize,
479 			const char *name)
480 {
481 	if (*funcsize <= 0)
482 		return -EOVERFLOW;
483 
484 	while (funcs->num_groups) {
485 		/* function already there */
486 		if (strcmp(funcs->name, name) == 0) {
487 			funcs->num_groups++;
488 			return -EEXIST;
489 		}
490 		funcs++;
491 	}
492 
493 	/* append new unique function */
494 	funcs->name = name;
495 	funcs->num_groups = 1;
496 	(*funcsize)--;
497 
498 	return 0;
499 }
500 
501 static int mvebu_pinctrl_build_functions(struct platform_device *pdev,
502 					 struct mvebu_pinctrl *pctl)
503 {
504 	struct mvebu_pinctrl_function *funcs;
505 	int num = 0, funcsize = pctl->desc.npins;
506 	int n, s;
507 
508 	/* we allocate functions for number of pins and hope
509 	 * there are fewer unique functions than pins available */
510 	funcs = devm_kcalloc(&pdev->dev,
511 			     funcsize, sizeof(struct mvebu_pinctrl_function),
512 			     GFP_KERNEL);
513 	if (!funcs)
514 		return -ENOMEM;
515 
516 	for (n = 0; n < pctl->num_groups; n++) {
517 		struct mvebu_pinctrl_group *grp = &pctl->groups[n];
518 		for (s = 0; s < grp->num_settings; s++) {
519 			int ret;
520 
521 			/* skip unsupported settings on this variant */
522 			if (pctl->variant &&
523 			    !(pctl->variant & grp->settings[s].variant))
524 				continue;
525 
526 			/* check for unique functions and count groups */
527 			ret = _add_function(funcs, &funcsize,
528 					    grp->settings[s].name);
529 			if (ret == -EOVERFLOW)
530 				dev_err(&pdev->dev,
531 					"More functions than pins(%d)\n",
532 					pctl->desc.npins);
533 			if (ret < 0)
534 				continue;
535 
536 			num++;
537 		}
538 	}
539 
540 	pctl->num_functions = num;
541 	pctl->functions = funcs;
542 
543 	for (n = 0; n < pctl->num_groups; n++) {
544 		struct mvebu_pinctrl_group *grp = &pctl->groups[n];
545 		for (s = 0; s < grp->num_settings; s++) {
546 			struct mvebu_pinctrl_function *f;
547 			const char **groups;
548 
549 			/* skip unsupported settings on this variant */
550 			if (pctl->variant &&
551 			    !(pctl->variant & grp->settings[s].variant))
552 				continue;
553 
554 			f = mvebu_pinctrl_find_function_by_name(pctl,
555 							grp->settings[s].name);
556 
557 			/* allocate group name array if not done already */
558 			if (!f->groups) {
559 				f->groups = devm_kcalloc(&pdev->dev,
560 						 f->num_groups,
561 						 sizeof(char *),
562 						 GFP_KERNEL);
563 				if (!f->groups)
564 					return -ENOMEM;
565 			}
566 
567 			/* find next free group name and assign current name */
568 			groups = f->groups;
569 			while (*groups)
570 				groups++;
571 			*groups = grp->name;
572 		}
573 	}
574 
575 	return 0;
576 }
577 
578 int mvebu_pinctrl_probe(struct platform_device *pdev)
579 {
580 	struct mvebu_pinctrl_soc_info *soc = dev_get_platdata(&pdev->dev);
581 	struct mvebu_pinctrl *pctl;
582 	struct pinctrl_pin_desc *pdesc;
583 	unsigned gid, n, k;
584 	unsigned size, noname = 0;
585 	char *noname_buf;
586 	void *p;
587 	int ret;
588 
589 	if (!soc || !soc->controls || !soc->modes) {
590 		dev_err(&pdev->dev, "wrong pinctrl soc info\n");
591 		return -EINVAL;
592 	}
593 
594 	pctl = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_pinctrl),
595 			GFP_KERNEL);
596 	if (!pctl)
597 		return -ENOMEM;
598 
599 	pctl->desc.name = dev_name(&pdev->dev);
600 	pctl->desc.owner = THIS_MODULE;
601 	pctl->desc.pctlops = &mvebu_pinctrl_ops;
602 	pctl->desc.pmxops = &mvebu_pinmux_ops;
603 	pctl->desc.confops = &mvebu_pinconf_ops;
604 	pctl->variant = soc->variant;
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 		const struct mvebu_mpp_ctrl *ctrl = &soc->controls[n];
614 
615 		pctl->desc.npins += ctrl->npins;
616 		/* initialize control's pins[] array */
617 		for (k = 0; k < ctrl->npins; k++)
618 			ctrl->pins[k] = ctrl->pid + k;
619 
620 		/*
621 		 * We allow to pass controls with NULL name that we treat
622 		 * as a range of one-pin groups with generic mvebu register
623 		 * controls.
624 		 */
625 		if (!ctrl->name) {
626 			pctl->num_groups += ctrl->npins;
627 			noname += ctrl->npins;
628 		} else {
629 			pctl->num_groups += 1;
630 		}
631 	}
632 
633 	pdesc = devm_kcalloc(&pdev->dev,
634 			     pctl->desc.npins,
635 			     sizeof(struct pinctrl_pin_desc),
636 			     GFP_KERNEL);
637 	if (!pdesc)
638 		return -ENOMEM;
639 
640 	for (n = 0; n < pctl->desc.npins; n++)
641 		pdesc[n].number = n;
642 	pctl->desc.pins = pdesc;
643 
644 	/*
645 	 * allocate groups and name buffers for unnamed groups.
646 	 */
647 	size = pctl->num_groups * sizeof(*pctl->groups) + noname * 8;
648 	p = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
649 	if (!p)
650 		return -ENOMEM;
651 
652 	pctl->groups = p;
653 	noname_buf = p + pctl->num_groups * sizeof(*pctl->groups);
654 
655 	/* assign mpp controls to groups */
656 	gid = 0;
657 	for (n = 0; n < soc->ncontrols; n++) {
658 		const struct mvebu_mpp_ctrl *ctrl = &soc->controls[n];
659 		struct mvebu_mpp_ctrl_data *data = soc->control_data ?
660 						   &soc->control_data[n] : NULL;
661 
662 		pctl->groups[gid].gid = gid;
663 		pctl->groups[gid].ctrl = ctrl;
664 		pctl->groups[gid].data = data;
665 		pctl->groups[gid].name = ctrl->name;
666 		pctl->groups[gid].pins = ctrl->pins;
667 		pctl->groups[gid].npins = ctrl->npins;
668 
669 		/*
670 		 * We treat unnamed controls as a range of one-pin groups
671 		 * with generic mvebu register controls. Use one group for
672 		 * each in this range and assign a default group name.
673 		 */
674 		if (!ctrl->name) {
675 			pctl->groups[gid].name = noname_buf;
676 			pctl->groups[gid].npins = 1;
677 			sprintf(noname_buf, "mpp%d", ctrl->pid+0);
678 			noname_buf += 8;
679 
680 			for (k = 1; k < ctrl->npins; k++) {
681 				gid++;
682 				pctl->groups[gid].gid = gid;
683 				pctl->groups[gid].ctrl = ctrl;
684 				pctl->groups[gid].data = data;
685 				pctl->groups[gid].name = noname_buf;
686 				pctl->groups[gid].pins = &ctrl->pins[k];
687 				pctl->groups[gid].npins = 1;
688 				sprintf(noname_buf, "mpp%d", ctrl->pid+k);
689 				noname_buf += 8;
690 			}
691 		}
692 		gid++;
693 	}
694 
695 	/* assign mpp modes to groups */
696 	for (n = 0; n < soc->nmodes; n++) {
697 		struct mvebu_mpp_mode *mode = &soc->modes[n];
698 		struct mvebu_mpp_ctrl_setting *set = &mode->settings[0];
699 		struct mvebu_pinctrl_group *grp;
700 		unsigned num_settings;
701 		unsigned supp_settings;
702 
703 		for (num_settings = 0, supp_settings = 0; ; set++) {
704 			if (!set->name)
705 				break;
706 
707 			num_settings++;
708 
709 			/* skip unsupported settings for this variant */
710 			if (pctl->variant && !(pctl->variant & set->variant))
711 				continue;
712 
713 			supp_settings++;
714 
715 			/* find gpio/gpo/gpi settings */
716 			if (strcmp(set->name, "gpio") == 0)
717 				set->flags = MVEBU_SETTING_GPI |
718 					MVEBU_SETTING_GPO;
719 			else if (strcmp(set->name, "gpo") == 0)
720 				set->flags = MVEBU_SETTING_GPO;
721 			else if (strcmp(set->name, "gpi") == 0)
722 				set->flags = MVEBU_SETTING_GPI;
723 		}
724 
725 		/* skip modes with no settings for this variant */
726 		if (!supp_settings)
727 			continue;
728 
729 		grp = mvebu_pinctrl_find_group_by_pid(pctl, mode->pid);
730 		if (!grp) {
731 			dev_warn(&pdev->dev, "unknown pinctrl group %d\n",
732 				mode->pid);
733 			continue;
734 		}
735 
736 		grp->settings = mode->settings;
737 		grp->num_settings = num_settings;
738 	}
739 
740 	ret = mvebu_pinctrl_build_functions(pdev, pctl);
741 	if (ret) {
742 		dev_err(&pdev->dev, "unable to build functions\n");
743 		return ret;
744 	}
745 
746 	pctl->pctldev = devm_pinctrl_register(&pdev->dev, &pctl->desc, pctl);
747 	if (IS_ERR(pctl->pctldev)) {
748 		dev_err(&pdev->dev, "unable to register pinctrl driver\n");
749 		return PTR_ERR(pctl->pctldev);
750 	}
751 
752 	dev_info(&pdev->dev, "registered pinctrl driver\n");
753 
754 	/* register gpio ranges */
755 	for (n = 0; n < soc->ngpioranges; n++)
756 		pinctrl_add_gpio_range(pctl->pctldev, &soc->gpioranges[n]);
757 
758 	return 0;
759 }
760 
761 /*
762  * mvebu_pinctrl_simple_mmio_probe - probe a simple mmio pinctrl
763  * @pdev: platform device (with platform data already attached)
764  *
765  * Initialise a simple (single base address) mmio pinctrl driver,
766  * assigning the MMIO base address to all mvebu mpp ctrl instances.
767  */
768 int mvebu_pinctrl_simple_mmio_probe(struct platform_device *pdev)
769 {
770 	struct mvebu_pinctrl_soc_info *soc = dev_get_platdata(&pdev->dev);
771 	struct mvebu_mpp_ctrl_data *mpp_data;
772 	void __iomem *base;
773 	int i;
774 
775 	base = devm_platform_ioremap_resource(pdev, 0);
776 	if (IS_ERR(base))
777 		return PTR_ERR(base);
778 
779 	mpp_data = devm_kcalloc(&pdev->dev, soc->ncontrols, sizeof(*mpp_data),
780 				GFP_KERNEL);
781 	if (!mpp_data)
782 		return -ENOMEM;
783 
784 	for (i = 0; i < soc->ncontrols; i++)
785 		mpp_data[i].base = base;
786 
787 	soc->control_data = mpp_data;
788 
789 	return mvebu_pinctrl_probe(pdev);
790 }
791 
792 int mvebu_regmap_mpp_ctrl_get(struct mvebu_mpp_ctrl_data *data,
793 			      unsigned int pid, unsigned long *config)
794 {
795 	unsigned off = (pid / MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
796 	unsigned shift = (pid % MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
797 	unsigned int val;
798 	int err;
799 
800 	err = regmap_read(data->regmap.map, data->regmap.offset + off, &val);
801 	if (err)
802 		return err;
803 
804 	*config = (val >> shift) & MVEBU_MPP_MASK;
805 
806 	return 0;
807 }
808 
809 int mvebu_regmap_mpp_ctrl_set(struct mvebu_mpp_ctrl_data *data,
810 			      unsigned int pid, unsigned long config)
811 {
812 	unsigned off = (pid / MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
813 	unsigned shift = (pid % MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
814 
815 	return regmap_update_bits(data->regmap.map, data->regmap.offset + off,
816 				  MVEBU_MPP_MASK << shift, config << shift);
817 }
818 
819 int mvebu_pinctrl_simple_regmap_probe(struct platform_device *pdev,
820 				      struct device *syscon_dev, u32 offset)
821 {
822 	struct mvebu_pinctrl_soc_info *soc = dev_get_platdata(&pdev->dev);
823 	struct mvebu_mpp_ctrl_data *mpp_data;
824 	struct regmap *regmap;
825 	int i;
826 
827 	regmap = syscon_node_to_regmap(syscon_dev->of_node);
828 	if (IS_ERR(regmap))
829 		return PTR_ERR(regmap);
830 
831 	mpp_data = devm_kcalloc(&pdev->dev, soc->ncontrols, sizeof(*mpp_data),
832 				GFP_KERNEL);
833 	if (!mpp_data)
834 		return -ENOMEM;
835 
836 	for (i = 0; i < soc->ncontrols; i++) {
837 		mpp_data[i].regmap.map = regmap;
838 		mpp_data[i].regmap.offset = offset;
839 	}
840 
841 	soc->control_data = mpp_data;
842 
843 	return mvebu_pinctrl_probe(pdev);
844 }
845