1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * SuperH Pin Function Controller pinmux support.
4  *
5  * Copyright (C) 2012  Paul Mundt
6  */
7 
8 #define DRV_NAME "sh-pfc"
9 
10 #include <linux/device.h>
11 #include <linux/err.h>
12 #include <linux/io.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/seq_file.h>
16 #include <linux/slab.h>
17 #include <linux/spinlock.h>
18 
19 #include <linux/pinctrl/consumer.h>
20 #include <linux/pinctrl/machine.h>
21 #include <linux/pinctrl/pinconf-generic.h>
22 #include <linux/pinctrl/pinconf.h>
23 #include <linux/pinctrl/pinctrl.h>
24 #include <linux/pinctrl/pinmux.h>
25 
26 #include "core.h"
27 #include "../core.h"
28 #include "../pinconf.h"
29 
30 struct sh_pfc_pin_config {
31 	u16 gpio_enabled:1;
32 	u16 mux_mark:15;
33 };
34 
35 struct sh_pfc_pinctrl {
36 	struct pinctrl_dev *pctl;
37 	struct pinctrl_desc pctl_desc;
38 
39 	struct sh_pfc *pfc;
40 
41 	struct pinctrl_pin_desc *pins;
42 	struct sh_pfc_pin_config *configs;
43 };
44 
sh_pfc_get_groups_count(struct pinctrl_dev * pctldev)45 static int sh_pfc_get_groups_count(struct pinctrl_dev *pctldev)
46 {
47 	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
48 
49 	return pmx->pfc->info->nr_groups;
50 }
51 
sh_pfc_get_group_name(struct pinctrl_dev * pctldev,unsigned selector)52 static const char *sh_pfc_get_group_name(struct pinctrl_dev *pctldev,
53 					 unsigned selector)
54 {
55 	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
56 
57 	return pmx->pfc->info->groups[selector].name;
58 }
59 
sh_pfc_get_group_pins(struct pinctrl_dev * pctldev,unsigned selector,const unsigned ** pins,unsigned * num_pins)60 static int sh_pfc_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
61 				 const unsigned **pins, unsigned *num_pins)
62 {
63 	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
64 
65 	*pins = pmx->pfc->info->groups[selector].pins;
66 	*num_pins = pmx->pfc->info->groups[selector].nr_pins;
67 
68 	return 0;
69 }
70 
sh_pfc_pin_dbg_show(struct pinctrl_dev * pctldev,struct seq_file * s,unsigned offset)71 static void sh_pfc_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
72 				unsigned offset)
73 {
74 	seq_puts(s, DRV_NAME);
75 }
76 
77 #ifdef CONFIG_OF
sh_pfc_map_add_config(struct pinctrl_map * map,const char * group_or_pin,enum pinctrl_map_type type,unsigned long * configs,unsigned int num_configs)78 static int sh_pfc_map_add_config(struct pinctrl_map *map,
79 				 const char *group_or_pin,
80 				 enum pinctrl_map_type type,
81 				 unsigned long *configs,
82 				 unsigned int num_configs)
83 {
84 	unsigned long *cfgs;
85 
86 	cfgs = kmemdup(configs, num_configs * sizeof(*cfgs),
87 		       GFP_KERNEL);
88 	if (cfgs == NULL)
89 		return -ENOMEM;
90 
91 	map->type = type;
92 	map->data.configs.group_or_pin = group_or_pin;
93 	map->data.configs.configs = cfgs;
94 	map->data.configs.num_configs = num_configs;
95 
96 	return 0;
97 }
98 
sh_pfc_dt_subnode_to_map(struct pinctrl_dev * pctldev,struct device_node * np,struct pinctrl_map ** map,unsigned int * num_maps,unsigned int * index)99 static int sh_pfc_dt_subnode_to_map(struct pinctrl_dev *pctldev,
100 				    struct device_node *np,
101 				    struct pinctrl_map **map,
102 				    unsigned int *num_maps, unsigned int *index)
103 {
104 	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
105 	struct device *dev = pmx->pfc->dev;
106 	struct pinctrl_map *maps = *map;
107 	unsigned int nmaps = *num_maps;
108 	unsigned int idx = *index;
109 	unsigned int num_configs;
110 	const char *function = NULL;
111 	unsigned long *configs;
112 	struct property *prop;
113 	unsigned int num_groups;
114 	unsigned int num_pins;
115 	const char *group;
116 	const char *pin;
117 	int ret;
118 
119 	/* Parse the function and configuration properties. At least a function
120 	 * or one configuration must be specified.
121 	 */
122 	ret = of_property_read_string(np, "function", &function);
123 	if (ret < 0 && ret != -EINVAL) {
124 		dev_err(dev, "Invalid function in DT\n");
125 		return ret;
126 	}
127 
128 	ret = pinconf_generic_parse_dt_config(np, NULL, &configs, &num_configs);
129 	if (ret < 0)
130 		return ret;
131 
132 	if (!function && num_configs == 0) {
133 		dev_err(dev,
134 			"DT node must contain at least a function or config\n");
135 		ret = -ENODEV;
136 		goto done;
137 	}
138 
139 	/* Count the number of pins and groups and reallocate mappings. */
140 	ret = of_property_count_strings(np, "pins");
141 	if (ret == -EINVAL) {
142 		num_pins = 0;
143 	} else if (ret < 0) {
144 		dev_err(dev, "Invalid pins list in DT\n");
145 		goto done;
146 	} else {
147 		num_pins = ret;
148 	}
149 
150 	ret = of_property_count_strings(np, "groups");
151 	if (ret == -EINVAL) {
152 		num_groups = 0;
153 	} else if (ret < 0) {
154 		dev_err(dev, "Invalid pin groups list in DT\n");
155 		goto done;
156 	} else {
157 		num_groups = ret;
158 	}
159 
160 	if (!num_pins && !num_groups) {
161 		dev_err(dev, "No pin or group provided in DT node\n");
162 		ret = -ENODEV;
163 		goto done;
164 	}
165 
166 	if (function)
167 		nmaps += num_groups;
168 	if (configs)
169 		nmaps += num_pins + num_groups;
170 
171 	maps = krealloc(maps, sizeof(*maps) * nmaps, GFP_KERNEL);
172 	if (maps == NULL) {
173 		ret = -ENOMEM;
174 		goto done;
175 	}
176 
177 	*map = maps;
178 	*num_maps = nmaps;
179 
180 	/* Iterate over pins and groups and create the mappings. */
181 	of_property_for_each_string(np, "groups", prop, group) {
182 		if (function) {
183 			maps[idx].type = PIN_MAP_TYPE_MUX_GROUP;
184 			maps[idx].data.mux.group = group;
185 			maps[idx].data.mux.function = function;
186 			idx++;
187 		}
188 
189 		if (configs) {
190 			ret = sh_pfc_map_add_config(&maps[idx], group,
191 						    PIN_MAP_TYPE_CONFIGS_GROUP,
192 						    configs, num_configs);
193 			if (ret < 0)
194 				goto done;
195 
196 			idx++;
197 		}
198 	}
199 
200 	if (!configs) {
201 		ret = 0;
202 		goto done;
203 	}
204 
205 	of_property_for_each_string(np, "pins", prop, pin) {
206 		ret = sh_pfc_map_add_config(&maps[idx], pin,
207 					    PIN_MAP_TYPE_CONFIGS_PIN,
208 					    configs, num_configs);
209 		if (ret < 0)
210 			goto done;
211 
212 		idx++;
213 	}
214 
215 done:
216 	*index = idx;
217 	kfree(configs);
218 	return ret;
219 }
220 
sh_pfc_dt_free_map(struct pinctrl_dev * pctldev,struct pinctrl_map * map,unsigned num_maps)221 static void sh_pfc_dt_free_map(struct pinctrl_dev *pctldev,
222 			       struct pinctrl_map *map, unsigned num_maps)
223 {
224 	unsigned int i;
225 
226 	if (map == NULL)
227 		return;
228 
229 	for (i = 0; i < num_maps; ++i) {
230 		if (map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP ||
231 		    map[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
232 			kfree(map[i].data.configs.configs);
233 	}
234 
235 	kfree(map);
236 }
237 
sh_pfc_dt_node_to_map(struct pinctrl_dev * pctldev,struct device_node * np,struct pinctrl_map ** map,unsigned * num_maps)238 static int sh_pfc_dt_node_to_map(struct pinctrl_dev *pctldev,
239 				 struct device_node *np,
240 				 struct pinctrl_map **map, unsigned *num_maps)
241 {
242 	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
243 	struct device *dev = pmx->pfc->dev;
244 	struct device_node *child;
245 	unsigned int index;
246 	int ret;
247 
248 	*map = NULL;
249 	*num_maps = 0;
250 	index = 0;
251 
252 	for_each_child_of_node(np, child) {
253 		ret = sh_pfc_dt_subnode_to_map(pctldev, child, map, num_maps,
254 					       &index);
255 		if (ret < 0) {
256 			of_node_put(child);
257 			goto done;
258 		}
259 	}
260 
261 	/* If no mapping has been found in child nodes try the config node. */
262 	if (*num_maps == 0) {
263 		ret = sh_pfc_dt_subnode_to_map(pctldev, np, map, num_maps,
264 					       &index);
265 		if (ret < 0)
266 			goto done;
267 	}
268 
269 	if (*num_maps)
270 		return 0;
271 
272 	dev_err(dev, "no mapping found in node %pOF\n", np);
273 	ret = -EINVAL;
274 
275 done:
276 	if (ret < 0)
277 		sh_pfc_dt_free_map(pctldev, *map, *num_maps);
278 
279 	return ret;
280 }
281 #endif /* CONFIG_OF */
282 
283 static const struct pinctrl_ops sh_pfc_pinctrl_ops = {
284 	.get_groups_count	= sh_pfc_get_groups_count,
285 	.get_group_name		= sh_pfc_get_group_name,
286 	.get_group_pins		= sh_pfc_get_group_pins,
287 	.pin_dbg_show		= sh_pfc_pin_dbg_show,
288 #ifdef CONFIG_OF
289 	.dt_node_to_map		= sh_pfc_dt_node_to_map,
290 	.dt_free_map		= sh_pfc_dt_free_map,
291 #endif
292 };
293 
sh_pfc_get_functions_count(struct pinctrl_dev * pctldev)294 static int sh_pfc_get_functions_count(struct pinctrl_dev *pctldev)
295 {
296 	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
297 
298 	return pmx->pfc->info->nr_functions;
299 }
300 
sh_pfc_get_function_name(struct pinctrl_dev * pctldev,unsigned selector)301 static const char *sh_pfc_get_function_name(struct pinctrl_dev *pctldev,
302 					    unsigned selector)
303 {
304 	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
305 
306 	return pmx->pfc->info->functions[selector].name;
307 }
308 
sh_pfc_get_function_groups(struct pinctrl_dev * pctldev,unsigned selector,const char * const ** groups,unsigned * const num_groups)309 static int sh_pfc_get_function_groups(struct pinctrl_dev *pctldev,
310 				      unsigned selector,
311 				      const char * const **groups,
312 				      unsigned * const num_groups)
313 {
314 	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
315 
316 	*groups = pmx->pfc->info->functions[selector].groups;
317 	*num_groups = pmx->pfc->info->functions[selector].nr_groups;
318 
319 	return 0;
320 }
321 
sh_pfc_func_set_mux(struct pinctrl_dev * pctldev,unsigned selector,unsigned group)322 static int sh_pfc_func_set_mux(struct pinctrl_dev *pctldev, unsigned selector,
323 			       unsigned group)
324 {
325 	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
326 	struct sh_pfc *pfc = pmx->pfc;
327 	const struct sh_pfc_pin_group *grp = &pfc->info->groups[group];
328 	unsigned long flags;
329 	unsigned int i;
330 	int ret = 0;
331 
332 	dev_dbg(pctldev->dev, "Configuring pin group %s\n", grp->name);
333 
334 	spin_lock_irqsave(&pfc->lock, flags);
335 
336 	for (i = 0; i < grp->nr_pins; ++i) {
337 		int idx = sh_pfc_get_pin_index(pfc, grp->pins[i]);
338 		struct sh_pfc_pin_config *cfg = &pmx->configs[idx];
339 
340 		/*
341 		 * This driver cannot manage both gpio and mux when the gpio
342 		 * pin is already enabled. So, this function fails.
343 		 */
344 		if (cfg->gpio_enabled) {
345 			ret = -EBUSY;
346 			goto done;
347 		}
348 
349 		ret = sh_pfc_config_mux(pfc, grp->mux[i], PINMUX_TYPE_FUNCTION);
350 		if (ret < 0)
351 			goto done;
352 	}
353 
354 	/* All group pins are configured, mark the pins as muxed */
355 	for (i = 0; i < grp->nr_pins; ++i) {
356 		int idx = sh_pfc_get_pin_index(pfc, grp->pins[i]);
357 		struct sh_pfc_pin_config *cfg = &pmx->configs[idx];
358 
359 		cfg->mux_mark = grp->mux[i];
360 	}
361 
362 done:
363 	spin_unlock_irqrestore(&pfc->lock, flags);
364 	return ret;
365 }
366 
sh_pfc_gpio_request_enable(struct pinctrl_dev * pctldev,struct pinctrl_gpio_range * range,unsigned offset)367 static int sh_pfc_gpio_request_enable(struct pinctrl_dev *pctldev,
368 				      struct pinctrl_gpio_range *range,
369 				      unsigned offset)
370 {
371 	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
372 	struct sh_pfc *pfc = pmx->pfc;
373 	int idx = sh_pfc_get_pin_index(pfc, offset);
374 	struct sh_pfc_pin_config *cfg = &pmx->configs[idx];
375 	unsigned long flags;
376 	int ret;
377 
378 	spin_lock_irqsave(&pfc->lock, flags);
379 
380 	if (!pfc->gpio && !cfg->mux_mark) {
381 		/* If GPIOs are handled externally the pin mux type needs to be
382 		 * set to GPIO here.
383 		 */
384 		const struct sh_pfc_pin *pin = &pfc->info->pins[idx];
385 
386 		ret = sh_pfc_config_mux(pfc, pin->enum_id, PINMUX_TYPE_GPIO);
387 		if (ret < 0)
388 			goto done;
389 	}
390 
391 	cfg->gpio_enabled = true;
392 
393 	ret = 0;
394 
395 done:
396 	spin_unlock_irqrestore(&pfc->lock, flags);
397 
398 	return ret;
399 }
400 
sh_pfc_gpio_disable_free(struct pinctrl_dev * pctldev,struct pinctrl_gpio_range * range,unsigned offset)401 static void sh_pfc_gpio_disable_free(struct pinctrl_dev *pctldev,
402 				     struct pinctrl_gpio_range *range,
403 				     unsigned offset)
404 {
405 	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
406 	struct sh_pfc *pfc = pmx->pfc;
407 	int idx = sh_pfc_get_pin_index(pfc, offset);
408 	struct sh_pfc_pin_config *cfg = &pmx->configs[idx];
409 	unsigned long flags;
410 
411 	spin_lock_irqsave(&pfc->lock, flags);
412 	cfg->gpio_enabled = false;
413 	/* If mux is already set, this configures it here */
414 	if (cfg->mux_mark)
415 		sh_pfc_config_mux(pfc, cfg->mux_mark, PINMUX_TYPE_FUNCTION);
416 	spin_unlock_irqrestore(&pfc->lock, flags);
417 }
418 
419 #ifdef CONFIG_PINCTRL_SH_PFC_GPIO
sh_pfc_gpio_set_direction(struct pinctrl_dev * pctldev,struct pinctrl_gpio_range * range,unsigned offset,bool input)420 static int sh_pfc_gpio_set_direction(struct pinctrl_dev *pctldev,
421 				     struct pinctrl_gpio_range *range,
422 				     unsigned offset, bool input)
423 {
424 	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
425 	struct sh_pfc *pfc = pmx->pfc;
426 	int new_type = input ? PINMUX_TYPE_INPUT : PINMUX_TYPE_OUTPUT;
427 	int idx = sh_pfc_get_pin_index(pfc, offset);
428 	const struct sh_pfc_pin *pin = &pfc->info->pins[idx];
429 	unsigned long flags;
430 	unsigned int dir;
431 	int ret;
432 
433 	/* Check if the requested direction is supported by the pin. Not all
434 	 * SoCs provide pin config data, so perform the check conditionally.
435 	 */
436 	if (pin->configs) {
437 		dir = input ? SH_PFC_PIN_CFG_INPUT : SH_PFC_PIN_CFG_OUTPUT;
438 		if (!(pin->configs & dir))
439 			return -EINVAL;
440 	}
441 
442 	spin_lock_irqsave(&pfc->lock, flags);
443 	ret = sh_pfc_config_mux(pfc, pin->enum_id, new_type);
444 	spin_unlock_irqrestore(&pfc->lock, flags);
445 	return ret;
446 }
447 #else
448 #define sh_pfc_gpio_set_direction	NULL
449 #endif
450 
451 static const struct pinmux_ops sh_pfc_pinmux_ops = {
452 	.get_functions_count	= sh_pfc_get_functions_count,
453 	.get_function_name	= sh_pfc_get_function_name,
454 	.get_function_groups	= sh_pfc_get_function_groups,
455 	.set_mux		= sh_pfc_func_set_mux,
456 	.gpio_request_enable	= sh_pfc_gpio_request_enable,
457 	.gpio_disable_free	= sh_pfc_gpio_disable_free,
458 	.gpio_set_direction	= sh_pfc_gpio_set_direction,
459 };
460 
sh_pfc_pinconf_find_drive_strength_reg(struct sh_pfc * pfc,unsigned int pin,unsigned int * offset,unsigned int * size)461 static u32 sh_pfc_pinconf_find_drive_strength_reg(struct sh_pfc *pfc,
462 		unsigned int pin, unsigned int *offset, unsigned int *size)
463 {
464 	const struct pinmux_drive_reg_field *field;
465 	const struct pinmux_drive_reg *reg;
466 	unsigned int i;
467 
468 	for (reg = pfc->info->drive_regs; reg->reg; ++reg) {
469 		for (i = 0; i < ARRAY_SIZE(reg->fields); ++i) {
470 			field = &reg->fields[i];
471 
472 			if (field->size && field->pin == pin) {
473 				*offset = field->offset;
474 				*size = field->size;
475 
476 				return reg->reg;
477 			}
478 		}
479 	}
480 
481 	return 0;
482 }
483 
sh_pfc_pinconf_get_drive_strength(struct sh_pfc * pfc,unsigned int pin)484 static int sh_pfc_pinconf_get_drive_strength(struct sh_pfc *pfc,
485 					     unsigned int pin)
486 {
487 	unsigned int offset;
488 	unsigned int size;
489 	u32 reg;
490 	u32 val;
491 
492 	reg = sh_pfc_pinconf_find_drive_strength_reg(pfc, pin, &offset, &size);
493 	if (!reg)
494 		return -EINVAL;
495 
496 	val = (sh_pfc_read(pfc, reg) >> offset) & GENMASK(size - 1, 0);
497 
498 	/* Convert the value to mA based on a full drive strength value of 24mA.
499 	 * We can make the full value configurable later if needed.
500 	 */
501 	return (val + 1) * (size == 2 ? 6 : 3);
502 }
503 
sh_pfc_pinconf_set_drive_strength(struct sh_pfc * pfc,unsigned int pin,u16 strength)504 static int sh_pfc_pinconf_set_drive_strength(struct sh_pfc *pfc,
505 					     unsigned int pin, u16 strength)
506 {
507 	unsigned long flags;
508 	unsigned int offset;
509 	unsigned int size;
510 	unsigned int step;
511 	u32 reg;
512 	u32 val;
513 
514 	reg = sh_pfc_pinconf_find_drive_strength_reg(pfc, pin, &offset, &size);
515 	if (!reg)
516 		return -EINVAL;
517 
518 	step = size == 2 ? 6 : 3;
519 
520 	if (strength < step || strength > 24)
521 		return -EINVAL;
522 
523 	/* Convert the value from mA based on a full drive strength value of
524 	 * 24mA. We can make the full value configurable later if needed.
525 	 */
526 	strength = strength / step - 1;
527 
528 	spin_lock_irqsave(&pfc->lock, flags);
529 
530 	val = sh_pfc_read(pfc, reg);
531 	val &= ~GENMASK(offset + size - 1, offset);
532 	val |= strength << offset;
533 
534 	sh_pfc_write(pfc, reg, val);
535 
536 	spin_unlock_irqrestore(&pfc->lock, flags);
537 
538 	return 0;
539 }
540 
541 /* Check whether the requested parameter is supported for a pin. */
sh_pfc_pinconf_validate(struct sh_pfc * pfc,unsigned int _pin,enum pin_config_param param)542 static bool sh_pfc_pinconf_validate(struct sh_pfc *pfc, unsigned int _pin,
543 				    enum pin_config_param param)
544 {
545 	int idx = sh_pfc_get_pin_index(pfc, _pin);
546 	const struct sh_pfc_pin *pin = &pfc->info->pins[idx];
547 
548 	switch (param) {
549 	case PIN_CONFIG_BIAS_DISABLE:
550 		return pin->configs & SH_PFC_PIN_CFG_PULL_UP_DOWN;
551 
552 	case PIN_CONFIG_BIAS_PULL_UP:
553 		return pin->configs & SH_PFC_PIN_CFG_PULL_UP;
554 
555 	case PIN_CONFIG_BIAS_PULL_DOWN:
556 		return pin->configs & SH_PFC_PIN_CFG_PULL_DOWN;
557 
558 	case PIN_CONFIG_DRIVE_STRENGTH:
559 		return pin->configs & SH_PFC_PIN_CFG_DRIVE_STRENGTH;
560 
561 	case PIN_CONFIG_POWER_SOURCE:
562 		return pin->configs & SH_PFC_PIN_CFG_IO_VOLTAGE_MASK;
563 
564 	default:
565 		return false;
566 	}
567 }
568 
sh_pfc_pinconf_get(struct pinctrl_dev * pctldev,unsigned _pin,unsigned long * config)569 static int sh_pfc_pinconf_get(struct pinctrl_dev *pctldev, unsigned _pin,
570 			      unsigned long *config)
571 {
572 	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
573 	struct sh_pfc *pfc = pmx->pfc;
574 	enum pin_config_param param = pinconf_to_config_param(*config);
575 	unsigned long flags;
576 	unsigned int arg;
577 
578 	if (!sh_pfc_pinconf_validate(pfc, _pin, param))
579 		return -ENOTSUPP;
580 
581 	switch (param) {
582 	case PIN_CONFIG_BIAS_DISABLE:
583 	case PIN_CONFIG_BIAS_PULL_UP:
584 	case PIN_CONFIG_BIAS_PULL_DOWN: {
585 		unsigned int bias;
586 
587 		if (!pfc->info->ops || !pfc->info->ops->get_bias)
588 			return -ENOTSUPP;
589 
590 		spin_lock_irqsave(&pfc->lock, flags);
591 		bias = pfc->info->ops->get_bias(pfc, _pin);
592 		spin_unlock_irqrestore(&pfc->lock, flags);
593 
594 		if (bias != param)
595 			return -EINVAL;
596 
597 		arg = 0;
598 		break;
599 	}
600 
601 	case PIN_CONFIG_DRIVE_STRENGTH: {
602 		int ret;
603 
604 		ret = sh_pfc_pinconf_get_drive_strength(pfc, _pin);
605 		if (ret < 0)
606 			return ret;
607 
608 		arg = ret;
609 		break;
610 	}
611 
612 	case PIN_CONFIG_POWER_SOURCE: {
613 		int idx = sh_pfc_get_pin_index(pfc, _pin);
614 		const struct sh_pfc_pin *pin = &pfc->info->pins[idx];
615 		unsigned int mode, lo, hi;
616 		u32 pocctrl, val;
617 		int bit;
618 
619 		if (!pfc->info->ops || !pfc->info->ops->pin_to_pocctrl)
620 			return -ENOTSUPP;
621 
622 		bit = pfc->info->ops->pin_to_pocctrl(_pin, &pocctrl);
623 		if (WARN(bit < 0, "invalid pin %#x", _pin))
624 			return bit;
625 
626 		val = sh_pfc_read(pfc, pocctrl);
627 
628 		mode = pin->configs & SH_PFC_PIN_CFG_IO_VOLTAGE_MASK;
629 		lo = mode <= SH_PFC_PIN_CFG_IO_VOLTAGE_18_33 ? 1800 : 2500;
630 		hi = mode >= SH_PFC_PIN_CFG_IO_VOLTAGE_18_33 ? 3300 : 2500;
631 
632 		arg = (val & BIT(bit)) ? hi : lo;
633 		break;
634 	}
635 
636 	default:
637 		return -ENOTSUPP;
638 	}
639 
640 	*config = pinconf_to_config_packed(param, arg);
641 	return 0;
642 }
643 
sh_pfc_pinconf_set(struct pinctrl_dev * pctldev,unsigned _pin,unsigned long * configs,unsigned num_configs)644 static int sh_pfc_pinconf_set(struct pinctrl_dev *pctldev, unsigned _pin,
645 			      unsigned long *configs, unsigned num_configs)
646 {
647 	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
648 	struct sh_pfc *pfc = pmx->pfc;
649 	enum pin_config_param param;
650 	unsigned long flags;
651 	unsigned int i;
652 
653 	for (i = 0; i < num_configs; i++) {
654 		param = pinconf_to_config_param(configs[i]);
655 
656 		if (!sh_pfc_pinconf_validate(pfc, _pin, param))
657 			return -ENOTSUPP;
658 
659 		switch (param) {
660 		case PIN_CONFIG_BIAS_PULL_UP:
661 		case PIN_CONFIG_BIAS_PULL_DOWN:
662 		case PIN_CONFIG_BIAS_DISABLE:
663 			if (!pfc->info->ops || !pfc->info->ops->set_bias)
664 				return -ENOTSUPP;
665 
666 			spin_lock_irqsave(&pfc->lock, flags);
667 			pfc->info->ops->set_bias(pfc, _pin, param);
668 			spin_unlock_irqrestore(&pfc->lock, flags);
669 
670 			break;
671 
672 		case PIN_CONFIG_DRIVE_STRENGTH: {
673 			unsigned int arg =
674 				pinconf_to_config_argument(configs[i]);
675 			int ret;
676 
677 			ret = sh_pfc_pinconf_set_drive_strength(pfc, _pin, arg);
678 			if (ret < 0)
679 				return ret;
680 
681 			break;
682 		}
683 
684 		case PIN_CONFIG_POWER_SOURCE: {
685 			unsigned int mV = pinconf_to_config_argument(configs[i]);
686 			int idx = sh_pfc_get_pin_index(pfc, _pin);
687 			const struct sh_pfc_pin *pin = &pfc->info->pins[idx];
688 			unsigned int mode, lo, hi;
689 			u32 pocctrl, val;
690 			int bit;
691 
692 			if (!pfc->info->ops || !pfc->info->ops->pin_to_pocctrl)
693 				return -ENOTSUPP;
694 
695 			bit = pfc->info->ops->pin_to_pocctrl(_pin, &pocctrl);
696 			if (WARN(bit < 0, "invalid pin %#x", _pin))
697 				return bit;
698 
699 			mode = pin->configs & SH_PFC_PIN_CFG_IO_VOLTAGE_MASK;
700 			lo = mode <= SH_PFC_PIN_CFG_IO_VOLTAGE_18_33 ? 1800 : 2500;
701 			hi = mode >= SH_PFC_PIN_CFG_IO_VOLTAGE_18_33 ? 3300 : 2500;
702 
703 			if (mV != lo && mV != hi)
704 				return -EINVAL;
705 
706 			spin_lock_irqsave(&pfc->lock, flags);
707 			val = sh_pfc_read(pfc, pocctrl);
708 			if (mV == hi)
709 				val |= BIT(bit);
710 			else
711 				val &= ~BIT(bit);
712 			sh_pfc_write(pfc, pocctrl, val);
713 			spin_unlock_irqrestore(&pfc->lock, flags);
714 
715 			break;
716 		}
717 
718 		default:
719 			return -ENOTSUPP;
720 		}
721 	} /* for each config */
722 
723 	return 0;
724 }
725 
sh_pfc_pinconf_group_set(struct pinctrl_dev * pctldev,unsigned group,unsigned long * configs,unsigned num_configs)726 static int sh_pfc_pinconf_group_set(struct pinctrl_dev *pctldev, unsigned group,
727 				    unsigned long *configs,
728 				    unsigned num_configs)
729 {
730 	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
731 	const unsigned int *pins;
732 	unsigned int num_pins;
733 	unsigned int i, ret;
734 
735 	pins = pmx->pfc->info->groups[group].pins;
736 	num_pins = pmx->pfc->info->groups[group].nr_pins;
737 
738 	for (i = 0; i < num_pins; ++i) {
739 		ret = sh_pfc_pinconf_set(pctldev, pins[i], configs, num_configs);
740 		if (ret)
741 			return ret;
742 	}
743 
744 	return 0;
745 }
746 
747 static const struct pinconf_ops sh_pfc_pinconf_ops = {
748 	.is_generic			= true,
749 	.pin_config_get			= sh_pfc_pinconf_get,
750 	.pin_config_set			= sh_pfc_pinconf_set,
751 	.pin_config_group_set		= sh_pfc_pinconf_group_set,
752 	.pin_config_config_dbg_show	= pinconf_generic_dump_config,
753 };
754 
755 /* PFC ranges -> pinctrl pin descs */
sh_pfc_map_pins(struct sh_pfc * pfc,struct sh_pfc_pinctrl * pmx)756 static int sh_pfc_map_pins(struct sh_pfc *pfc, struct sh_pfc_pinctrl *pmx)
757 {
758 	unsigned int i;
759 
760 	/* Allocate and initialize the pins and configs arrays. */
761 	pmx->pins = devm_kcalloc(pfc->dev,
762 				 pfc->info->nr_pins, sizeof(*pmx->pins),
763 				 GFP_KERNEL);
764 	if (unlikely(!pmx->pins))
765 		return -ENOMEM;
766 
767 	pmx->configs = devm_kcalloc(pfc->dev,
768 				    pfc->info->nr_pins, sizeof(*pmx->configs),
769 				    GFP_KERNEL);
770 	if (unlikely(!pmx->configs))
771 		return -ENOMEM;
772 
773 	for (i = 0; i < pfc->info->nr_pins; ++i) {
774 		const struct sh_pfc_pin *info = &pfc->info->pins[i];
775 		struct pinctrl_pin_desc *pin = &pmx->pins[i];
776 
777 		/* If the pin number is equal to -1 all pins are considered */
778 		pin->number = info->pin != (u16)-1 ? info->pin : i;
779 		pin->name = info->name;
780 	}
781 
782 	return 0;
783 }
784 
sh_pfc_register_pinctrl(struct sh_pfc * pfc)785 int sh_pfc_register_pinctrl(struct sh_pfc *pfc)
786 {
787 	struct sh_pfc_pinctrl *pmx;
788 	int ret;
789 
790 	pmx = devm_kzalloc(pfc->dev, sizeof(*pmx), GFP_KERNEL);
791 	if (unlikely(!pmx))
792 		return -ENOMEM;
793 
794 	pmx->pfc = pfc;
795 
796 	ret = sh_pfc_map_pins(pfc, pmx);
797 	if (ret < 0)
798 		return ret;
799 
800 	pmx->pctl_desc.name = DRV_NAME;
801 	pmx->pctl_desc.owner = THIS_MODULE;
802 	pmx->pctl_desc.pctlops = &sh_pfc_pinctrl_ops;
803 	pmx->pctl_desc.pmxops = &sh_pfc_pinmux_ops;
804 	pmx->pctl_desc.confops = &sh_pfc_pinconf_ops;
805 	pmx->pctl_desc.pins = pmx->pins;
806 	pmx->pctl_desc.npins = pfc->info->nr_pins;
807 
808 	ret = devm_pinctrl_register_and_init(pfc->dev, &pmx->pctl_desc, pmx,
809 					     &pmx->pctl);
810 	if (ret) {
811 		dev_err(pfc->dev, "could not register: %i\n", ret);
812 
813 		return ret;
814 	}
815 
816 	return pinctrl_enable(pmx->pctl);
817 }
818 
819 const struct pinmux_bias_reg *
rcar_pin_to_bias_reg(const struct sh_pfc_soc_info * info,unsigned int pin,unsigned int * bit)820 rcar_pin_to_bias_reg(const struct sh_pfc_soc_info *info, unsigned int pin,
821 		     unsigned int *bit)
822 {
823 	unsigned int i, j;
824 
825 	for (i = 0; info->bias_regs[i].puen || info->bias_regs[i].pud; i++) {
826 		for (j = 0; j < ARRAY_SIZE(info->bias_regs[i].pins); j++) {
827 			if (info->bias_regs[i].pins[j] == pin) {
828 				*bit = j;
829 				return &info->bias_regs[i];
830 			}
831 		}
832 	}
833 
834 	WARN_ONCE(1, "Pin %u is not in bias info list\n", pin);
835 
836 	return NULL;
837 }
838 
rcar_pinmux_get_bias(struct sh_pfc * pfc,unsigned int pin)839 unsigned int rcar_pinmux_get_bias(struct sh_pfc *pfc, unsigned int pin)
840 {
841 	const struct pinmux_bias_reg *reg;
842 	unsigned int bit;
843 
844 	reg = rcar_pin_to_bias_reg(pfc->info, pin, &bit);
845 	if (!reg)
846 		return PIN_CONFIG_BIAS_DISABLE;
847 
848 	if (reg->puen) {
849 		if (!(sh_pfc_read(pfc, reg->puen) & BIT(bit)))
850 			return PIN_CONFIG_BIAS_DISABLE;
851 		else if (!reg->pud || (sh_pfc_read(pfc, reg->pud) & BIT(bit)))
852 			return PIN_CONFIG_BIAS_PULL_UP;
853 		else
854 			return PIN_CONFIG_BIAS_PULL_DOWN;
855 	} else {
856 		if (sh_pfc_read(pfc, reg->pud) & BIT(bit))
857 			return PIN_CONFIG_BIAS_PULL_DOWN;
858 		else
859 			return PIN_CONFIG_BIAS_DISABLE;
860 	}
861 }
862 
rcar_pinmux_set_bias(struct sh_pfc * pfc,unsigned int pin,unsigned int bias)863 void rcar_pinmux_set_bias(struct sh_pfc *pfc, unsigned int pin,
864 			  unsigned int bias)
865 {
866 	const struct pinmux_bias_reg *reg;
867 	u32 enable, updown;
868 	unsigned int bit;
869 
870 	reg = rcar_pin_to_bias_reg(pfc->info, pin, &bit);
871 	if (!reg)
872 		return;
873 
874 	if (reg->puen) {
875 		enable = sh_pfc_read(pfc, reg->puen) & ~BIT(bit);
876 		if (bias != PIN_CONFIG_BIAS_DISABLE) {
877 			enable |= BIT(bit);
878 
879 			if (reg->pud) {
880 				updown = sh_pfc_read(pfc, reg->pud) & ~BIT(bit);
881 				if (bias == PIN_CONFIG_BIAS_PULL_UP)
882 					updown |= BIT(bit);
883 
884 				sh_pfc_write(pfc, reg->pud, updown);
885 			}
886 		}
887 		sh_pfc_write(pfc, reg->puen, enable);
888 	} else {
889 		enable = sh_pfc_read(pfc, reg->pud) & ~BIT(bit);
890 		if (bias == PIN_CONFIG_BIAS_PULL_DOWN)
891 			enable |= BIT(bit);
892 
893 		sh_pfc_write(pfc, reg->pud, enable);
894 	}
895 }
896 
897 #define PORTnCR_PULMD_OFF	(0 << 6)
898 #define PORTnCR_PULMD_DOWN	(2 << 6)
899 #define PORTnCR_PULMD_UP	(3 << 6)
900 #define PORTnCR_PULMD_MASK	(3 << 6)
901 
rmobile_pinmux_get_bias(struct sh_pfc * pfc,unsigned int pin)902 unsigned int rmobile_pinmux_get_bias(struct sh_pfc *pfc, unsigned int pin)
903 {
904 	void __iomem *reg = pfc->windows->virt +
905 			    pfc->info->ops->pin_to_portcr(pin);
906 	u32 value = ioread8(reg) & PORTnCR_PULMD_MASK;
907 
908 	switch (value) {
909 	case PORTnCR_PULMD_UP:
910 		return PIN_CONFIG_BIAS_PULL_UP;
911 	case PORTnCR_PULMD_DOWN:
912 		return PIN_CONFIG_BIAS_PULL_DOWN;
913 	case PORTnCR_PULMD_OFF:
914 	default:
915 		return PIN_CONFIG_BIAS_DISABLE;
916 	}
917 }
918 
rmobile_pinmux_set_bias(struct sh_pfc * pfc,unsigned int pin,unsigned int bias)919 void rmobile_pinmux_set_bias(struct sh_pfc *pfc, unsigned int pin,
920 			     unsigned int bias)
921 {
922 	void __iomem *reg = pfc->windows->virt +
923 			    pfc->info->ops->pin_to_portcr(pin);
924 	u32 value = ioread8(reg) & ~PORTnCR_PULMD_MASK;
925 
926 	switch (bias) {
927 	case PIN_CONFIG_BIAS_PULL_UP:
928 		value |= PORTnCR_PULMD_UP;
929 		break;
930 	case PIN_CONFIG_BIAS_PULL_DOWN:
931 		value |= PORTnCR_PULMD_DOWN;
932 		break;
933 	}
934 
935 	iowrite8(value, reg);
936 }
937