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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / pinctrl / stm32 / pinctrl-stm32.c
blob2d5e0435af0a4428d887e9d3d7e49eebe70d2bc9
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) Maxime Coquelin 2015
4 * Copyright (C) STMicroelectronics 2017
5 * Author: Maxime Coquelin <mcoquelin.stm32@gmail.com>
6 *
7 * Heavily based on Mediatek's pinctrl driver
8 */
9 #include <linux/clk.h>
10 #include <linux/gpio/driver.h>
11 #include <linux/hwspinlock.h>
12 #include <linux/io.h>
13 #include <linux/irq.h>
14 #include <linux/mfd/syscon.h>
15 #include <linux/module.h>
16 #include <linux/of.h>
17 #include <linux/of_address.h>
18 #include <linux/of_device.h>
19 #include <linux/of_irq.h>
20 #include <linux/pinctrl/consumer.h>
21 #include <linux/pinctrl/machine.h>
22 #include <linux/pinctrl/pinconf.h>
23 #include <linux/pinctrl/pinconf-generic.h>
24 #include <linux/pinctrl/pinctrl.h>
25 #include <linux/pinctrl/pinmux.h>
26 #include <linux/platform_device.h>
27 #include <linux/regmap.h>
28 #include <linux/reset.h>
29 #include <linux/slab.h>
30
31 #include "../core.h"
32 #include "../pinconf.h"
33 #include "../pinctrl-utils.h"
34 #include "pinctrl-stm32.h"
35
36 #define STM32_GPIO_MODER 0x00
37 #define STM32_GPIO_TYPER 0x04
38 #define STM32_GPIO_SPEEDR 0x08
39 #define STM32_GPIO_PUPDR 0x0c
40 #define STM32_GPIO_IDR 0x10
41 #define STM32_GPIO_ODR 0x14
42 #define STM32_GPIO_BSRR 0x18
43 #define STM32_GPIO_LCKR 0x1c
44 #define STM32_GPIO_AFRL 0x20
45 #define STM32_GPIO_AFRH 0x24
46
47 /* custom bitfield to backup pin status */
48 #define STM32_GPIO_BKP_MODE_SHIFT 0
49 #define STM32_GPIO_BKP_MODE_MASK GENMASK(1, 0)
50 #define STM32_GPIO_BKP_ALT_SHIFT 2
51 #define STM32_GPIO_BKP_ALT_MASK GENMASK(5, 2)
52 #define STM32_GPIO_BKP_SPEED_SHIFT 6
53 #define STM32_GPIO_BKP_SPEED_MASK GENMASK(7, 6)
54 #define STM32_GPIO_BKP_PUPD_SHIFT 8
55 #define STM32_GPIO_BKP_PUPD_MASK GENMASK(9, 8)
56 #define STM32_GPIO_BKP_TYPE 10
57 #define STM32_GPIO_BKP_VAL 11
58
59 #define STM32_GPIO_PINS_PER_BANK 16
60 #define STM32_GPIO_IRQ_LINE 16
61
62 #define SYSCFG_IRQMUX_MASK GENMASK(3, 0)
63
64 #define gpio_range_to_bank(chip) \
65 container_of(chip, struct stm32_gpio_bank, range)
66
67 #define HWSPINLOCK_TIMEOUT 5 /* msec */
68
69 static const char * const stm32_gpio_functions[] = {
70 "gpio", "af0", "af1",
71 "af2", "af3", "af4",
72 "af5", "af6", "af7",
73 "af8", "af9", "af10",
74 "af11", "af12", "af13",
75 "af14", "af15", "analog",
76 };
77
78 struct stm32_pinctrl_group {
79 const char *name;
80 unsigned long config;
81 unsigned pin;
82 };
83
84 struct stm32_gpio_bank {
85 void __iomem *base;
86 struct clk *clk;
87 spinlock_t lock;
88 struct gpio_chip gpio_chip;
89 struct pinctrl_gpio_range range;
90 struct fwnode_handle *fwnode;
91 struct irq_domain *domain;
92 u32 bank_nr;
93 u32 bank_ioport_nr;
94 u32 pin_backup[STM32_GPIO_PINS_PER_BANK];
95 };
96
97 struct stm32_pinctrl {
98 struct device *dev;
99 struct pinctrl_dev *pctl_dev;
100 struct pinctrl_desc pctl_desc;
101 struct stm32_pinctrl_group *groups;
102 unsigned ngroups;
103 const char **grp_names;
104 struct stm32_gpio_bank *banks;
105 unsigned nbanks;
106 const struct stm32_pinctrl_match_data *match_data;
107 struct irq_domain *domain;
108 struct regmap *regmap;
109 struct regmap_field *irqmux[STM32_GPIO_PINS_PER_BANK];
110 struct hwspinlock *hwlock;
111 struct stm32_desc_pin *pins;
112 u32 npins;
113 u32 pkg;
114 u16 irqmux_map;
115 spinlock_t irqmux_lock;
116 };
117
118 static inline int stm32_gpio_pin(int gpio)
119 {
120 return gpio % STM32_GPIO_PINS_PER_BANK;
121 }
122
123 static inline u32 stm32_gpio_get_mode(u32 function)
124 {
125 switch (function) {
126 case STM32_PIN_GPIO:
127 return 0;
128 case STM32_PIN_AF(0) ... STM32_PIN_AF(15):
129 return 2;
130 case STM32_PIN_ANALOG:
131 return 3;
132 }
133
134 return 0;
135 }
136
137 static inline u32 stm32_gpio_get_alt(u32 function)
138 {
139 switch (function) {
140 case STM32_PIN_GPIO:
141 return 0;
142 case STM32_PIN_AF(0) ... STM32_PIN_AF(15):
143 return function - 1;
144 case STM32_PIN_ANALOG:
145 return 0;
146 }
147
148 return 0;
149 }
150
151 static void stm32_gpio_backup_value(struct stm32_gpio_bank *bank,
152 u32 offset, u32 value)
153 {
154 bank->pin_backup[offset] &= ~BIT(STM32_GPIO_BKP_VAL);
155 bank->pin_backup[offset] |= value << STM32_GPIO_BKP_VAL;
156 }
157
158 static void stm32_gpio_backup_mode(struct stm32_gpio_bank *bank, u32 offset,
159 u32 mode, u32 alt)
160 {
161 bank->pin_backup[offset] &= ~(STM32_GPIO_BKP_MODE_MASK |
162 STM32_GPIO_BKP_ALT_MASK);
163 bank->pin_backup[offset] |= mode << STM32_GPIO_BKP_MODE_SHIFT;
164 bank->pin_backup[offset] |= alt << STM32_GPIO_BKP_ALT_SHIFT;
165 }
166
167 static void stm32_gpio_backup_driving(struct stm32_gpio_bank *bank, u32 offset,
168 u32 drive)
169 {
170 bank->pin_backup[offset] &= ~BIT(STM32_GPIO_BKP_TYPE);
171 bank->pin_backup[offset] |= drive << STM32_GPIO_BKP_TYPE;
172 }
173
174 static void stm32_gpio_backup_speed(struct stm32_gpio_bank *bank, u32 offset,
175 u32 speed)
176 {
177 bank->pin_backup[offset] &= ~STM32_GPIO_BKP_SPEED_MASK;
178 bank->pin_backup[offset] |= speed << STM32_GPIO_BKP_SPEED_SHIFT;
179 }
180
181 static void stm32_gpio_backup_bias(struct stm32_gpio_bank *bank, u32 offset,
182 u32 bias)
183 {
184 bank->pin_backup[offset] &= ~STM32_GPIO_BKP_PUPD_MASK;
185 bank->pin_backup[offset] |= bias << STM32_GPIO_BKP_PUPD_SHIFT;
186 }
187
188 /* GPIO functions */
189
190 static inline void __stm32_gpio_set(struct stm32_gpio_bank *bank,
191 unsigned offset, int value)
192 {
193 stm32_gpio_backup_value(bank, offset, value);
194
195 if (!value)
196 offset += STM32_GPIO_PINS_PER_BANK;
197
198 clk_enable(bank->clk);
199
200 writel_relaxed(BIT(offset), bank->base + STM32_GPIO_BSRR);
201
202 clk_disable(bank->clk);
203 }
204
205 static int stm32_gpio_request(struct gpio_chip *chip, unsigned offset)
206 {
207 struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
208 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
209 struct pinctrl_gpio_range *range;
210 int pin = offset + (bank->bank_nr * STM32_GPIO_PINS_PER_BANK);
211
212 range = pinctrl_find_gpio_range_from_pin_nolock(pctl->pctl_dev, pin);
213 if (!range) {
214 dev_err(pctl->dev, "pin %d not in range.\n", pin);
215 return -EINVAL;
216 }
217
218 return pinctrl_gpio_request(chip->base + offset);
219 }
220
221 static void stm32_gpio_free(struct gpio_chip *chip, unsigned offset)
222 {
223 pinctrl_gpio_free(chip->base + offset);
224 }
225
226 static int stm32_gpio_get(struct gpio_chip *chip, unsigned offset)
227 {
228 struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
229 int ret;
230
231 clk_enable(bank->clk);
232
233 ret = !!(readl_relaxed(bank->base + STM32_GPIO_IDR) & BIT(offset));
234
235 clk_disable(bank->clk);
236
237 return ret;
238 }
239
240 static void stm32_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
241 {
242 struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
243
244 __stm32_gpio_set(bank, offset, value);
245 }
246
247 static int stm32_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
248 {
249 return pinctrl_gpio_direction_input(chip->base + offset);
250 }
251
252 static int stm32_gpio_direction_output(struct gpio_chip *chip,
253 unsigned offset, int value)
254 {
255 struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
256
257 __stm32_gpio_set(bank, offset, value);
258 pinctrl_gpio_direction_output(chip->base + offset);
259
260 return 0;
261 }
262
263
264 static int stm32_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
265 {
266 struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
267 struct irq_fwspec fwspec;
268
269 fwspec.fwnode = bank->fwnode;
270 fwspec.param_count = 2;
271 fwspec.param[0] = offset;
272 fwspec.param[1] = IRQ_TYPE_NONE;
273
274 return irq_create_fwspec_mapping(&fwspec);
275 }
276
277 static int stm32_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
278 {
279 struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
280 int pin = stm32_gpio_pin(offset);
281 int ret;
282 u32 mode, alt;
283
284 stm32_pmx_get_mode(bank, pin, &mode, &alt);
285 if ((alt == 0) && (mode == 0))
286 ret = 1;
287 else if ((alt == 0) && (mode == 1))
288 ret = 0;
289 else
290 ret = -EINVAL;
291
292 return ret;
293 }
294
295 static const struct gpio_chip stm32_gpio_template = {
296 .request = stm32_gpio_request,
297 .free = stm32_gpio_free,
298 .get = stm32_gpio_get,
299 .set = stm32_gpio_set,
300 .direction_input = stm32_gpio_direction_input,
301 .direction_output = stm32_gpio_direction_output,
302 .to_irq = stm32_gpio_to_irq,
303 .get_direction = stm32_gpio_get_direction,
304 };
305
306 static int stm32_gpio_irq_request_resources(struct irq_data *irq_data)
307 {
308 struct stm32_gpio_bank *bank = irq_data->domain->host_data;
309 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
310 int ret;
311
312 ret = stm32_gpio_direction_input(&bank->gpio_chip, irq_data->hwirq);
313 if (ret)
314 return ret;
315
316 ret = gpiochip_lock_as_irq(&bank->gpio_chip, irq_data->hwirq);
317 if (ret) {
318 dev_err(pctl->dev, "unable to lock HW IRQ %lu for IRQ\n",
319 irq_data->hwirq);
320 return ret;
321 }
322
323 return 0;
324 }
325
326 static void stm32_gpio_irq_release_resources(struct irq_data *irq_data)
327 {
328 struct stm32_gpio_bank *bank = irq_data->domain->host_data;
329
330 gpiochip_unlock_as_irq(&bank->gpio_chip, irq_data->hwirq);
331 }
332
333 static struct irq_chip stm32_gpio_irq_chip = {
334 .name = "stm32gpio",
335 .irq_eoi = irq_chip_eoi_parent,
336 .irq_ack = irq_chip_ack_parent,
337 .irq_mask = irq_chip_mask_parent,
338 .irq_unmask = irq_chip_unmask_parent,
339 .irq_set_type = irq_chip_set_type_parent,
340 .irq_set_wake = irq_chip_set_wake_parent,
341 .irq_request_resources = stm32_gpio_irq_request_resources,
342 .irq_release_resources = stm32_gpio_irq_release_resources,
343 };
344
345 static int stm32_gpio_domain_translate(struct irq_domain *d,
346 struct irq_fwspec *fwspec,
347 unsigned long *hwirq,
348 unsigned int *type)
349 {
350 if ((fwspec->param_count != 2) ||
351 (fwspec->param[0] >= STM32_GPIO_IRQ_LINE))
352 return -EINVAL;
353
354 *hwirq = fwspec->param[0];
355 *type = fwspec->param[1];
356 return 0;
357 }
358
359 static int stm32_gpio_domain_activate(struct irq_domain *d,
360 struct irq_data *irq_data, bool reserve)
361 {
362 struct stm32_gpio_bank *bank = d->host_data;
363 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
364 unsigned long flags;
365 int ret = 0;
366
367 /*
368 * gpio irq mux is shared between several banks, a lock has to be done
369 * to avoid overriding.
370 */
371 spin_lock_irqsave(&pctl->irqmux_lock, flags);
372 if (pctl->hwlock)
373 ret = hwspin_lock_timeout(pctl->hwlock, HWSPINLOCK_TIMEOUT);
374
375 if (ret) {
376 dev_err(pctl->dev, "Can't get hwspinlock\n");
377 goto unlock;
378 }
379
380 if (pctl->irqmux_map & BIT(irq_data->hwirq)) {
381 dev_err(pctl->dev, "irq line %ld already requested.\n",
382 irq_data->hwirq);
383 ret = -EBUSY;
384 if (pctl->hwlock)
385 hwspin_unlock(pctl->hwlock);
386 goto unlock;
387 } else {
388 pctl->irqmux_map |= BIT(irq_data->hwirq);
389 }
390
391 regmap_field_write(pctl->irqmux[irq_data->hwirq], bank->bank_ioport_nr);
392
393 if (pctl->hwlock)
394 hwspin_unlock(pctl->hwlock);
395
396 unlock:
397 spin_unlock_irqrestore(&pctl->irqmux_lock, flags);
398 return ret;
399 }
400
401 static void stm32_gpio_domain_deactivate(struct irq_domain *d,
402 struct irq_data *irq_data)
403 {
404 struct stm32_gpio_bank *bank = d->host_data;
405 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
406 unsigned long flags;
407
408 spin_lock_irqsave(&pctl->irqmux_lock, flags);
409 pctl->irqmux_map &= ~BIT(irq_data->hwirq);
410 spin_unlock_irqrestore(&pctl->irqmux_lock, flags);
411 }
412
413 static int stm32_gpio_domain_alloc(struct irq_domain *d,
414 unsigned int virq,
415 unsigned int nr_irqs, void *data)
416 {
417 struct stm32_gpio_bank *bank = d->host_data;
418 struct irq_fwspec *fwspec = data;
419 struct irq_fwspec parent_fwspec;
420 irq_hw_number_t hwirq;
421
422 hwirq = fwspec->param[0];
423 parent_fwspec.fwnode = d->parent->fwnode;
424 parent_fwspec.param_count = 2;
425 parent_fwspec.param[0] = fwspec->param[0];
426 parent_fwspec.param[1] = fwspec->param[1];
427
428 irq_domain_set_hwirq_and_chip(d, virq, hwirq, &stm32_gpio_irq_chip,
429 bank);
430
431 return irq_domain_alloc_irqs_parent(d, virq, nr_irqs, &parent_fwspec);
432 }
433
434 static const struct irq_domain_ops stm32_gpio_domain_ops = {
435 .translate = stm32_gpio_domain_translate,
436 .alloc = stm32_gpio_domain_alloc,
437 .free = irq_domain_free_irqs_common,
438 .activate = stm32_gpio_domain_activate,
439 .deactivate = stm32_gpio_domain_deactivate,
440 };
441
442 /* Pinctrl functions */
443 static struct stm32_pinctrl_group *
444 stm32_pctrl_find_group_by_pin(struct stm32_pinctrl *pctl, u32 pin)
445 {
446 int i;
447
448 for (i = 0; i < pctl->ngroups; i++) {
449 struct stm32_pinctrl_group *grp = pctl->groups + i;
450
451 if (grp->pin == pin)
452 return grp;
453 }
454
455 return NULL;
456 }
457
458 static bool stm32_pctrl_is_function_valid(struct stm32_pinctrl *pctl,
459 u32 pin_num, u32 fnum)
460 {
461 int i;
462
463 for (i = 0; i < pctl->npins; i++) {
464 const struct stm32_desc_pin *pin = pctl->pins + i;
465 const struct stm32_desc_function *func = pin->functions;
466
467 if (pin->pin.number != pin_num)
468 continue;
469
470 while (func && func->name) {
471 if (func->num == fnum)
472 return true;
473 func++;
474 }
475
476 break;
477 }
478
479 return false;
480 }
481
482 static int stm32_pctrl_dt_node_to_map_func(struct stm32_pinctrl *pctl,
483 u32 pin, u32 fnum, struct stm32_pinctrl_group *grp,
484 struct pinctrl_map **map, unsigned *reserved_maps,
485 unsigned *num_maps)
486 {
487 if (*num_maps == *reserved_maps)
488 return -ENOSPC;
489
490 (*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
491 (*map)[*num_maps].data.mux.group = grp->name;
492
493 if (!stm32_pctrl_is_function_valid(pctl, pin, fnum)) {
494 dev_err(pctl->dev, "invalid function %d on pin %d .\n",
495 fnum, pin);
496 return -EINVAL;
497 }
498
499 (*map)[*num_maps].data.mux.function = stm32_gpio_functions[fnum];
500 (*num_maps)++;
501
502 return 0;
503 }
504
505 static int stm32_pctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
506 struct device_node *node,
507 struct pinctrl_map **map,
508 unsigned *reserved_maps,
509 unsigned *num_maps)
510 {
511 struct stm32_pinctrl *pctl;
512 struct stm32_pinctrl_group *grp;
513 struct property *pins;
514 u32 pinfunc, pin, func;
515 unsigned long *configs;
516 unsigned int num_configs;
517 bool has_config = 0;
518 unsigned reserve = 0;
519 int num_pins, num_funcs, maps_per_pin, i, err = 0;
520
521 pctl = pinctrl_dev_get_drvdata(pctldev);
522
523 pins = of_find_property(node, "pinmux", NULL);
524 if (!pins) {
525 dev_err(pctl->dev, "missing pins property in node %pOFn .\n",
526 node);
527 return -EINVAL;
528 }
529
530 err = pinconf_generic_parse_dt_config(node, pctldev, &configs,
531 &num_configs);
532 if (err)
533 return err;
534
535 if (num_configs)
536 has_config = 1;
537
538 num_pins = pins->length / sizeof(u32);
539 num_funcs = num_pins;
540 maps_per_pin = 0;
541 if (num_funcs)
542 maps_per_pin++;
543 if (has_config && num_pins >= 1)
544 maps_per_pin++;
545
546 if (!num_pins || !maps_per_pin) {
547 err = -EINVAL;
548 goto exit;
549 }
550
551 reserve = num_pins * maps_per_pin;
552
553 err = pinctrl_utils_reserve_map(pctldev, map,
554 reserved_maps, num_maps, reserve);
555 if (err)
556 goto exit;
557
558 for (i = 0; i < num_pins; i++) {
559 err = of_property_read_u32_index(node, "pinmux",
560 i, &pinfunc);
561 if (err)
562 goto exit;
563
564 pin = STM32_GET_PIN_NO(pinfunc);
565 func = STM32_GET_PIN_FUNC(pinfunc);
566
567 if (!stm32_pctrl_is_function_valid(pctl, pin, func)) {
568 dev_err(pctl->dev, "invalid function.\n");
569 err = -EINVAL;
570 goto exit;
571 }
572
573 grp = stm32_pctrl_find_group_by_pin(pctl, pin);
574 if (!grp) {
575 dev_err(pctl->dev, "unable to match pin %d to group\n",
576 pin);
577 err = -EINVAL;
578 goto exit;
579 }
580
581 err = stm32_pctrl_dt_node_to_map_func(pctl, pin, func, grp, map,
582 reserved_maps, num_maps);
583 if (err)
584 goto exit;
585
586 if (has_config) {
587 err = pinctrl_utils_add_map_configs(pctldev, map,
588 reserved_maps, num_maps, grp->name,
589 configs, num_configs,
590 PIN_MAP_TYPE_CONFIGS_GROUP);
591 if (err)
592 goto exit;
593 }
594 }
595
596 exit:
597 kfree(configs);
598 return err;
599 }
600
601 static int stm32_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
602 struct device_node *np_config,
603 struct pinctrl_map **map, unsigned *num_maps)
604 {
605 struct device_node *np;
606 unsigned reserved_maps;
607 int ret;
608
609 *map = NULL;
610 *num_maps = 0;
611 reserved_maps = 0;
612
613 for_each_child_of_node(np_config, np) {
614 ret = stm32_pctrl_dt_subnode_to_map(pctldev, np, map,
615 &reserved_maps, num_maps);
616 if (ret < 0) {
617 pinctrl_utils_free_map(pctldev, *map, *num_maps);
618 of_node_put(np);
619 return ret;
620 }
621 }
622
623 return 0;
624 }
625
626 static int stm32_pctrl_get_groups_count(struct pinctrl_dev *pctldev)
627 {
628 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
629
630 return pctl->ngroups;
631 }
632
633 static const char *stm32_pctrl_get_group_name(struct pinctrl_dev *pctldev,
634 unsigned group)
635 {
636 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
637
638 return pctl->groups[group].name;
639 }
640
641 static int stm32_pctrl_get_group_pins(struct pinctrl_dev *pctldev,
642 unsigned group,
643 const unsigned **pins,
644 unsigned *num_pins)
645 {
646 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
647
648 *pins = (unsigned *)&pctl->groups[group].pin;
649 *num_pins = 1;
650
651 return 0;
652 }
653
654 static const struct pinctrl_ops stm32_pctrl_ops = {
655 .dt_node_to_map = stm32_pctrl_dt_node_to_map,
656 .dt_free_map = pinctrl_utils_free_map,
657 .get_groups_count = stm32_pctrl_get_groups_count,
658 .get_group_name = stm32_pctrl_get_group_name,
659 .get_group_pins = stm32_pctrl_get_group_pins,
660 };
661
662
663 /* Pinmux functions */
664
665 static int stm32_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev)
666 {
667 return ARRAY_SIZE(stm32_gpio_functions);
668 }
669
670 static const char *stm32_pmx_get_func_name(struct pinctrl_dev *pctldev,
671 unsigned selector)
672 {
673 return stm32_gpio_functions[selector];
674 }
675
676 static int stm32_pmx_get_func_groups(struct pinctrl_dev *pctldev,
677 unsigned function,
678 const char * const **groups,
679 unsigned * const num_groups)
680 {
681 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
682
683 *groups = pctl->grp_names;
684 *num_groups = pctl->ngroups;
685
686 return 0;
687 }
688
689 static int stm32_pmx_set_mode(struct stm32_gpio_bank *bank,
690 int pin, u32 mode, u32 alt)
691 {
692 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
693 u32 val;
694 int alt_shift = (pin % 8) * 4;
695 int alt_offset = STM32_GPIO_AFRL + (pin / 8) * 4;
696 unsigned long flags;
697 int err = 0;
698
699 clk_enable(bank->clk);
700 spin_lock_irqsave(&bank->lock, flags);
701
702 if (pctl->hwlock)
703 err = hwspin_lock_timeout(pctl->hwlock, HWSPINLOCK_TIMEOUT);
704
705 if (err) {
706 dev_err(pctl->dev, "Can't get hwspinlock\n");
707 goto unlock;
708 }
709
710 val = readl_relaxed(bank->base + alt_offset);
711 val &= ~GENMASK(alt_shift + 3, alt_shift);
712 val |= (alt << alt_shift);
713 writel_relaxed(val, bank->base + alt_offset);
714
715 val = readl_relaxed(bank->base + STM32_GPIO_MODER);
716 val &= ~GENMASK(pin * 2 + 1, pin * 2);
717 val |= mode << (pin * 2);
718 writel_relaxed(val, bank->base + STM32_GPIO_MODER);
719
720 if (pctl->hwlock)
721 hwspin_unlock(pctl->hwlock);
722
723 stm32_gpio_backup_mode(bank, pin, mode, alt);
724
725 unlock:
726 spin_unlock_irqrestore(&bank->lock, flags);
727 clk_disable(bank->clk);
728
729 return err;
730 }
731
732 void stm32_pmx_get_mode(struct stm32_gpio_bank *bank, int pin, u32 *mode,
733 u32 *alt)
734 {
735 u32 val;
736 int alt_shift = (pin % 8) * 4;
737 int alt_offset = STM32_GPIO_AFRL + (pin / 8) * 4;
738 unsigned long flags;
739
740 clk_enable(bank->clk);
741 spin_lock_irqsave(&bank->lock, flags);
742
743 val = readl_relaxed(bank->base + alt_offset);
744 val &= GENMASK(alt_shift + 3, alt_shift);
745 *alt = val >> alt_shift;
746
747 val = readl_relaxed(bank->base + STM32_GPIO_MODER);
748 val &= GENMASK(pin * 2 + 1, pin * 2);
749 *mode = val >> (pin * 2);
750
751 spin_unlock_irqrestore(&bank->lock, flags);
752 clk_disable(bank->clk);
753 }
754
755 static int stm32_pmx_set_mux(struct pinctrl_dev *pctldev,
756 unsigned function,
757 unsigned group)
758 {
759 bool ret;
760 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
761 struct stm32_pinctrl_group *g = pctl->groups + group;
762 struct pinctrl_gpio_range *range;
763 struct stm32_gpio_bank *bank;
764 u32 mode, alt;
765 int pin;
766
767 ret = stm32_pctrl_is_function_valid(pctl, g->pin, function);
768 if (!ret) {
769 dev_err(pctl->dev, "invalid function %d on group %d .\n",
770 function, group);
771 return -EINVAL;
772 }
773
774 range = pinctrl_find_gpio_range_from_pin(pctldev, g->pin);
775 if (!range) {
776 dev_err(pctl->dev, "No gpio range defined.\n");
777 return -EINVAL;
778 }
779
780 bank = gpiochip_get_data(range->gc);
781 pin = stm32_gpio_pin(g->pin);
782
783 mode = stm32_gpio_get_mode(function);
784 alt = stm32_gpio_get_alt(function);
785
786 return stm32_pmx_set_mode(bank, pin, mode, alt);
787 }
788
789 static int stm32_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
790 struct pinctrl_gpio_range *range, unsigned gpio,
791 bool input)
792 {
793 struct stm32_gpio_bank *bank = gpiochip_get_data(range->gc);
794 int pin = stm32_gpio_pin(gpio);
795
796 return stm32_pmx_set_mode(bank, pin, !input, 0);
797 }
798
799 static const struct pinmux_ops stm32_pmx_ops = {
800 .get_functions_count = stm32_pmx_get_funcs_cnt,
801 .get_function_name = stm32_pmx_get_func_name,
802 .get_function_groups = stm32_pmx_get_func_groups,
803 .set_mux = stm32_pmx_set_mux,
804 .gpio_set_direction = stm32_pmx_gpio_set_direction,
805 .strict = true,
806 };
807
808 /* Pinconf functions */
809
810 static int stm32_pconf_set_driving(struct stm32_gpio_bank *bank,
811 unsigned offset, u32 drive)
812 {
813 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
814 unsigned long flags;
815 u32 val;
816 int err = 0;
817
818 clk_enable(bank->clk);
819 spin_lock_irqsave(&bank->lock, flags);
820
821 if (pctl->hwlock)
822 err = hwspin_lock_timeout(pctl->hwlock, HWSPINLOCK_TIMEOUT);
823
824 if (err) {
825 dev_err(pctl->dev, "Can't get hwspinlock\n");
826 goto unlock;
827 }
828
829 val = readl_relaxed(bank->base + STM32_GPIO_TYPER);
830 val &= ~BIT(offset);
831 val |= drive << offset;
832 writel_relaxed(val, bank->base + STM32_GPIO_TYPER);
833
834 if (pctl->hwlock)
835 hwspin_unlock(pctl->hwlock);
836
837 stm32_gpio_backup_driving(bank, offset, drive);
838
839 unlock:
840 spin_unlock_irqrestore(&bank->lock, flags);
841 clk_disable(bank->clk);
842
843 return err;
844 }
845
846 static u32 stm32_pconf_get_driving(struct stm32_gpio_bank *bank,
847 unsigned int offset)
848 {
849 unsigned long flags;
850 u32 val;
851
852 clk_enable(bank->clk);
853 spin_lock_irqsave(&bank->lock, flags);
854
855 val = readl_relaxed(bank->base + STM32_GPIO_TYPER);
856 val &= BIT(offset);
857
858 spin_unlock_irqrestore(&bank->lock, flags);
859 clk_disable(bank->clk);
860
861 return (val >> offset);
862 }
863
864 static int stm32_pconf_set_speed(struct stm32_gpio_bank *bank,
865 unsigned offset, u32 speed)
866 {
867 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
868 unsigned long flags;
869 u32 val;
870 int err = 0;
871
872 clk_enable(bank->clk);
873 spin_lock_irqsave(&bank->lock, flags);
874
875 if (pctl->hwlock)
876 err = hwspin_lock_timeout(pctl->hwlock, HWSPINLOCK_TIMEOUT);
877
878 if (err) {
879 dev_err(pctl->dev, "Can't get hwspinlock\n");
880 goto unlock;
881 }
882
883 val = readl_relaxed(bank->base + STM32_GPIO_SPEEDR);
884 val &= ~GENMASK(offset * 2 + 1, offset * 2);
885 val |= speed << (offset * 2);
886 writel_relaxed(val, bank->base + STM32_GPIO_SPEEDR);
887
888 if (pctl->hwlock)
889 hwspin_unlock(pctl->hwlock);
890
891 stm32_gpio_backup_speed(bank, offset, speed);
892
893 unlock:
894 spin_unlock_irqrestore(&bank->lock, flags);
895 clk_disable(bank->clk);
896
897 return err;
898 }
899
900 static u32 stm32_pconf_get_speed(struct stm32_gpio_bank *bank,
901 unsigned int offset)
902 {
903 unsigned long flags;
904 u32 val;
905
906 clk_enable(bank->clk);
907 spin_lock_irqsave(&bank->lock, flags);
908
909 val = readl_relaxed(bank->base + STM32_GPIO_SPEEDR);
910 val &= GENMASK(offset * 2 + 1, offset * 2);
911
912 spin_unlock_irqrestore(&bank->lock, flags);
913 clk_disable(bank->clk);
914
915 return (val >> (offset * 2));
916 }
917
918 static int stm32_pconf_set_bias(struct stm32_gpio_bank *bank,
919 unsigned offset, u32 bias)
920 {
921 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
922 unsigned long flags;
923 u32 val;
924 int err = 0;
925
926 clk_enable(bank->clk);
927 spin_lock_irqsave(&bank->lock, flags);
928
929 if (pctl->hwlock)
930 err = hwspin_lock_timeout(pctl->hwlock, HWSPINLOCK_TIMEOUT);
931
932 if (err) {
933 dev_err(pctl->dev, "Can't get hwspinlock\n");
934 goto unlock;
935 }
936
937 val = readl_relaxed(bank->base + STM32_GPIO_PUPDR);
938 val &= ~GENMASK(offset * 2 + 1, offset * 2);
939 val |= bias << (offset * 2);
940 writel_relaxed(val, bank->base + STM32_GPIO_PUPDR);
941
942 if (pctl->hwlock)
943 hwspin_unlock(pctl->hwlock);
944
945 stm32_gpio_backup_bias(bank, offset, bias);
946
947 unlock:
948 spin_unlock_irqrestore(&bank->lock, flags);
949 clk_disable(bank->clk);
950
951 return err;
952 }
953
954 static u32 stm32_pconf_get_bias(struct stm32_gpio_bank *bank,
955 unsigned int offset)
956 {
957 unsigned long flags;
958 u32 val;
959
960 clk_enable(bank->clk);
961 spin_lock_irqsave(&bank->lock, flags);
962
963 val = readl_relaxed(bank->base + STM32_GPIO_PUPDR);
964 val &= GENMASK(offset * 2 + 1, offset * 2);
965
966 spin_unlock_irqrestore(&bank->lock, flags);
967 clk_disable(bank->clk);
968
969 return (val >> (offset * 2));
970 }
971
972 static bool stm32_pconf_get(struct stm32_gpio_bank *bank,
973 unsigned int offset, bool dir)
974 {
975 unsigned long flags;
976 u32 val;
977
978 clk_enable(bank->clk);
979 spin_lock_irqsave(&bank->lock, flags);
980
981 if (dir)
982 val = !!(readl_relaxed(bank->base + STM32_GPIO_IDR) &
983 BIT(offset));
984 else
985 val = !!(readl_relaxed(bank->base + STM32_GPIO_ODR) &
986 BIT(offset));
987
988 spin_unlock_irqrestore(&bank->lock, flags);
989 clk_disable(bank->clk);
990
991 return val;
992 }
993
994 static int stm32_pconf_parse_conf(struct pinctrl_dev *pctldev,
995 unsigned int pin, enum pin_config_param param,
996 enum pin_config_param arg)
997 {
998 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
999 struct pinctrl_gpio_range *range;
1000 struct stm32_gpio_bank *bank;
1001 int offset, ret = 0;
1002
1003 range = pinctrl_find_gpio_range_from_pin(pctldev, pin);
1004 if (!range) {
1005 dev_err(pctl->dev, "No gpio range defined.\n");
1006 return -EINVAL;
1007 }
1008
1009 bank = gpiochip_get_data(range->gc);
1010 offset = stm32_gpio_pin(pin);
1011
1012 switch (param) {
1013 case PIN_CONFIG_DRIVE_PUSH_PULL:
1014 ret = stm32_pconf_set_driving(bank, offset, 0);
1015 break;
1016 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
1017 ret = stm32_pconf_set_driving(bank, offset, 1);
1018 break;
1019 case PIN_CONFIG_SLEW_RATE:
1020 ret = stm32_pconf_set_speed(bank, offset, arg);
1021 break;
1022 case PIN_CONFIG_BIAS_DISABLE:
1023 ret = stm32_pconf_set_bias(bank, offset, 0);
1024 break;
1025 case PIN_CONFIG_BIAS_PULL_UP:
1026 ret = stm32_pconf_set_bias(bank, offset, 1);
1027 break;
1028 case PIN_CONFIG_BIAS_PULL_DOWN:
1029 ret = stm32_pconf_set_bias(bank, offset, 2);
1030 break;
1031 case PIN_CONFIG_OUTPUT:
1032 __stm32_gpio_set(bank, offset, arg);
1033 ret = stm32_pmx_gpio_set_direction(pctldev, range, pin, false);
1034 break;
1035 default:
1036 ret = -EINVAL;
1037 }
1038
1039 return ret;
1040 }
1041
1042 static int stm32_pconf_group_get(struct pinctrl_dev *pctldev,
1043 unsigned group,
1044 unsigned long *config)
1045 {
1046 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
1047
1048 *config = pctl->groups[group].config;
1049
1050 return 0;
1051 }
1052
1053 static int stm32_pconf_group_set(struct pinctrl_dev *pctldev, unsigned group,
1054 unsigned long *configs, unsigned num_configs)
1055 {
1056 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
1057 struct stm32_pinctrl_group *g = &pctl->groups[group];
1058 int i, ret;
1059
1060 for (i = 0; i < num_configs; i++) {
1061 ret = stm32_pconf_parse_conf(pctldev, g->pin,
1062 pinconf_to_config_param(configs[i]),
1063 pinconf_to_config_argument(configs[i]));
1064 if (ret < 0)
1065 return ret;
1066
1067 g->config = configs[i];
1068 }
1069
1070 return 0;
1071 }
1072
1073 static void stm32_pconf_dbg_show(struct pinctrl_dev *pctldev,
1074 struct seq_file *s,
1075 unsigned int pin)
1076 {
1077 struct pinctrl_gpio_range *range;
1078 struct stm32_gpio_bank *bank;
1079 int offset;
1080 u32 mode, alt, drive, speed, bias;
1081 static const char * const modes[] = {
1082 "input", "output", "alternate", "analog" };
1083 static const char * const speeds[] = {
1084 "low", "medium", "high", "very high" };
1085 static const char * const biasing[] = {
1086 "floating", "pull up", "pull down", "" };
1087 bool val;
1088
1089 range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin);
1090 if (!range)
1091 return;
1092
1093 bank = gpiochip_get_data(range->gc);
1094 offset = stm32_gpio_pin(pin);
1095
1096 stm32_pmx_get_mode(bank, offset, &mode, &alt);
1097 bias = stm32_pconf_get_bias(bank, offset);
1098
1099 seq_printf(s, "%s ", modes[mode]);
1100
1101 switch (mode) {
1102 /* input */
1103 case 0:
1104 val = stm32_pconf_get(bank, offset, true);
1105 seq_printf(s, "- %s - %s",
1106 val ? "high" : "low",
1107 biasing[bias]);
1108 break;
1109
1110 /* output */
1111 case 1:
1112 drive = stm32_pconf_get_driving(bank, offset);
1113 speed = stm32_pconf_get_speed(bank, offset);
1114 val = stm32_pconf_get(bank, offset, false);
1115 seq_printf(s, "- %s - %s - %s - %s %s",
1116 val ? "high" : "low",
1117 drive ? "open drain" : "push pull",
1118 biasing[bias],
1119 speeds[speed], "speed");
1120 break;
1121
1122 /* alternate */
1123 case 2:
1124 drive = stm32_pconf_get_driving(bank, offset);
1125 speed = stm32_pconf_get_speed(bank, offset);
1126 seq_printf(s, "%d - %s - %s - %s %s", alt,
1127 drive ? "open drain" : "push pull",
1128 biasing[bias],
1129 speeds[speed], "speed");
1130 break;
1131
1132 /* analog */
1133 case 3:
1134 break;
1135 }
1136 }
1137
1138
1139 static const struct pinconf_ops stm32_pconf_ops = {
1140 .pin_config_group_get = stm32_pconf_group_get,
1141 .pin_config_group_set = stm32_pconf_group_set,
1142 .pin_config_dbg_show = stm32_pconf_dbg_show,
1143 };
1144
1145 static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl,
1146 struct device_node *np)
1147 {
1148 struct stm32_gpio_bank *bank = &pctl->banks[pctl->nbanks];
1149 int bank_ioport_nr;
1150 struct pinctrl_gpio_range *range = &bank->range;
1151 struct of_phandle_args args;
1152 struct device *dev = pctl->dev;
1153 struct resource res;
1154 struct reset_control *rstc;
1155 int npins = STM32_GPIO_PINS_PER_BANK;
1156 int bank_nr, err;
1157
1158 rstc = of_reset_control_get_exclusive(np, NULL);
1159 if (!IS_ERR(rstc))
1160 reset_control_deassert(rstc);
1161
1162 if (of_address_to_resource(np, 0, &res))
1163 return -ENODEV;
1164
1165 bank->base = devm_ioremap_resource(dev, &res);
1166 if (IS_ERR(bank->base))
1167 return PTR_ERR(bank->base);
1168
1169 bank->clk = of_clk_get_by_name(np, NULL);
1170 if (IS_ERR(bank->clk)) {
1171 dev_err(dev, "failed to get clk (%ld)\n", PTR_ERR(bank->clk));
1172 return PTR_ERR(bank->clk);
1173 }
1174
1175 err = clk_prepare(bank->clk);
1176 if (err) {
1177 dev_err(dev, "failed to prepare clk (%d)\n", err);
1178 return err;
1179 }
1180
1181 bank->gpio_chip = stm32_gpio_template;
1182
1183 of_property_read_string(np, "st,bank-name", &bank->gpio_chip.label);
1184
1185 if (!of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 0, &args)) {
1186 bank_nr = args.args[1] / STM32_GPIO_PINS_PER_BANK;
1187 bank->gpio_chip.base = args.args[1];
1188 } else {
1189 bank_nr = pctl->nbanks;
1190 bank->gpio_chip.base = bank_nr * STM32_GPIO_PINS_PER_BANK;
1191 range->name = bank->gpio_chip.label;
1192 range->id = bank_nr;
1193 range->pin_base = range->id * STM32_GPIO_PINS_PER_BANK;
1194 range->base = range->id * STM32_GPIO_PINS_PER_BANK;
1195 range->npins = npins;
1196 range->gc = &bank->gpio_chip;
1197 pinctrl_add_gpio_range(pctl->pctl_dev,
1198 &pctl->banks[bank_nr].range);
1199 }
1200
1201 if (of_property_read_u32(np, "st,bank-ioport", &bank_ioport_nr))
1202 bank_ioport_nr = bank_nr;
1203
1204 bank->gpio_chip.base = bank_nr * STM32_GPIO_PINS_PER_BANK;
1205
1206 bank->gpio_chip.ngpio = npins;
1207 bank->gpio_chip.of_node = np;
1208 bank->gpio_chip.parent = dev;
1209 bank->bank_nr = bank_nr;
1210 bank->bank_ioport_nr = bank_ioport_nr;
1211 spin_lock_init(&bank->lock);
1212
1213 /* create irq hierarchical domain */
1214 bank->fwnode = of_node_to_fwnode(np);
1215
1216 bank->domain = irq_domain_create_hierarchy(pctl->domain, 0,
1217 STM32_GPIO_IRQ_LINE, bank->fwnode,
1218 &stm32_gpio_domain_ops, bank);
1219
1220 if (!bank->domain)
1221 return -ENODEV;
1222
1223 err = gpiochip_add_data(&bank->gpio_chip, bank);
1224 if (err) {
1225 dev_err(dev, "Failed to add gpiochip(%d)!\n", bank_nr);
1226 return err;
1227 }
1228
1229 dev_info(dev, "%s bank added\n", bank->gpio_chip.label);
1230 return 0;
1231 }
1232
1233 static struct irq_domain *stm32_pctrl_get_irq_domain(struct device_node *np)
1234 {
1235 struct device_node *parent;
1236 struct irq_domain *domain;
1237
1238 if (!of_find_property(np, "interrupt-parent", NULL))
1239 return NULL;
1240
1241 parent = of_irq_find_parent(np);
1242 if (!parent)
1243 return ERR_PTR(-ENXIO);
1244
1245 domain = irq_find_host(parent);
1246 if (!domain)
1247 /* domain not registered yet */
1248 return ERR_PTR(-EPROBE_DEFER);
1249
1250 return domain;
1251 }
1252
1253 static int stm32_pctrl_dt_setup_irq(struct platform_device *pdev,
1254 struct stm32_pinctrl *pctl)
1255 {
1256 struct device_node *np = pdev->dev.of_node;
1257 struct device *dev = &pdev->dev;
1258 struct regmap *rm;
1259 int offset, ret, i;
1260 int mask, mask_width;
1261
1262 pctl->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
1263 if (IS_ERR(pctl->regmap))
1264 return PTR_ERR(pctl->regmap);
1265
1266 rm = pctl->regmap;
1267
1268 ret = of_property_read_u32_index(np, "st,syscfg", 1, &offset);
1269 if (ret)
1270 return ret;
1271
1272 ret = of_property_read_u32_index(np, "st,syscfg", 2, &mask);
1273 if (ret)
1274 mask = SYSCFG_IRQMUX_MASK;
1275
1276 mask_width = fls(mask);
1277
1278 for (i = 0; i < STM32_GPIO_PINS_PER_BANK; i++) {
1279 struct reg_field mux;
1280
1281 mux.reg = offset + (i / 4) * 4;
1282 mux.lsb = (i % 4) * mask_width;
1283 mux.msb = mux.lsb + mask_width - 1;
1284
1285 dev_dbg(dev, "irqmux%d: reg:%#x, lsb:%d, msb:%d\n",
1286 i, mux.reg, mux.lsb, mux.msb);
1287
1288 pctl->irqmux[i] = devm_regmap_field_alloc(dev, rm, mux);
1289 if (IS_ERR(pctl->irqmux[i]))
1290 return PTR_ERR(pctl->irqmux[i]);
1291 }
1292
1293 return 0;
1294 }
1295
1296 static int stm32_pctrl_build_state(struct platform_device *pdev)
1297 {
1298 struct stm32_pinctrl *pctl = platform_get_drvdata(pdev);
1299 int i;
1300
1301 pctl->ngroups = pctl->npins;
1302
1303 /* Allocate groups */
1304 pctl->groups = devm_kcalloc(&pdev->dev, pctl->ngroups,
1305 sizeof(*pctl->groups), GFP_KERNEL);
1306 if (!pctl->groups)
1307 return -ENOMEM;
1308
1309 /* We assume that one pin is one group, use pin name as group name. */
1310 pctl->grp_names = devm_kcalloc(&pdev->dev, pctl->ngroups,
1311 sizeof(*pctl->grp_names), GFP_KERNEL);
1312 if (!pctl->grp_names)
1313 return -ENOMEM;
1314
1315 for (i = 0; i < pctl->npins; i++) {
1316 const struct stm32_desc_pin *pin = pctl->pins + i;
1317 struct stm32_pinctrl_group *group = pctl->groups + i;
1318
1319 group->name = pin->pin.name;
1320 group->pin = pin->pin.number;
1321 pctl->grp_names[i] = pin->pin.name;
1322 }
1323
1324 return 0;
1325 }
1326
1327 static int stm32_pctrl_create_pins_tab(struct stm32_pinctrl *pctl,
1328 struct stm32_desc_pin *pins)
1329 {
1330 const struct stm32_desc_pin *p;
1331 int i, nb_pins_available = 0;
1332
1333 for (i = 0; i < pctl->match_data->npins; i++) {
1334 p = pctl->match_data->pins + i;
1335 if (pctl->pkg && !(pctl->pkg & p->pkg))
1336 continue;
1337 pins->pin = p->pin;
1338 pins->functions = p->functions;
1339 pins++;
1340 nb_pins_available++;
1341 }
1342
1343 pctl->npins = nb_pins_available;
1344
1345 return 0;
1346 }
1347
1348 static void stm32_pctl_get_package(struct device_node *np,
1349 struct stm32_pinctrl *pctl)
1350 {
1351 if (of_property_read_u32(np, "st,package", &pctl->pkg)) {
1352 pctl->pkg = 0;
1353 dev_warn(pctl->dev, "No package detected, use default one\n");
1354 } else {
1355 dev_dbg(pctl->dev, "package detected: %x\n", pctl->pkg);
1356 }
1357 }
1358
1359 int stm32_pctl_probe(struct platform_device *pdev)
1360 {
1361 struct device_node *np = pdev->dev.of_node;
1362 struct device_node *child;
1363 const struct of_device_id *match;
1364 struct device *dev = &pdev->dev;
1365 struct stm32_pinctrl *pctl;
1366 struct pinctrl_pin_desc *pins;
1367 int i, ret, hwlock_id, banks = 0;
1368
1369 if (!np)
1370 return -EINVAL;
1371
1372 match = of_match_device(dev->driver->of_match_table, dev);
1373 if (!match || !match->data)
1374 return -EINVAL;
1375
1376 if (!of_find_property(np, "pins-are-numbered", NULL)) {
1377 dev_err(dev, "only support pins-are-numbered format\n");
1378 return -EINVAL;
1379 }
1380
1381 pctl = devm_kzalloc(dev, sizeof(*pctl), GFP_KERNEL);
1382 if (!pctl)
1383 return -ENOMEM;
1384
1385 platform_set_drvdata(pdev, pctl);
1386
1387 /* check for IRQ controller (may require deferred probe) */
1388 pctl->domain = stm32_pctrl_get_irq_domain(np);
1389 if (IS_ERR(pctl->domain))
1390 return PTR_ERR(pctl->domain);
1391
1392 /* hwspinlock is optional */
1393 hwlock_id = of_hwspin_lock_get_id(pdev->dev.of_node, 0);
1394 if (hwlock_id < 0) {
1395 if (hwlock_id == -EPROBE_DEFER)
1396 return hwlock_id;
1397 } else {
1398 pctl->hwlock = hwspin_lock_request_specific(hwlock_id);
1399 }
1400
1401 spin_lock_init(&pctl->irqmux_lock);
1402
1403 pctl->dev = dev;
1404 pctl->match_data = match->data;
1405
1406 /* get package information */
1407 stm32_pctl_get_package(np, pctl);
1408
1409 pctl->pins = devm_kcalloc(pctl->dev, pctl->match_data->npins,
1410 sizeof(*pctl->pins), GFP_KERNEL);
1411 if (!pctl->pins)
1412 return -ENOMEM;
1413
1414 ret = stm32_pctrl_create_pins_tab(pctl, pctl->pins);
1415 if (ret)
1416 return ret;
1417
1418 ret = stm32_pctrl_build_state(pdev);
1419 if (ret) {
1420 dev_err(dev, "build state failed: %d\n", ret);
1421 return -EINVAL;
1422 }
1423
1424 if (pctl->domain) {
1425 ret = stm32_pctrl_dt_setup_irq(pdev, pctl);
1426 if (ret)
1427 return ret;
1428 }
1429
1430 pins = devm_kcalloc(&pdev->dev, pctl->npins, sizeof(*pins),
1431 GFP_KERNEL);
1432 if (!pins)
1433 return -ENOMEM;
1434
1435 for (i = 0; i < pctl->npins; i++)
1436 pins[i] = pctl->pins[i].pin;
1437
1438 pctl->pctl_desc.name = dev_name(&pdev->dev);
1439 pctl->pctl_desc.owner = THIS_MODULE;
1440 pctl->pctl_desc.pins = pins;
1441 pctl->pctl_desc.npins = pctl->npins;
1442 pctl->pctl_desc.link_consumers = true;
1443 pctl->pctl_desc.confops = &stm32_pconf_ops;
1444 pctl->pctl_desc.pctlops = &stm32_pctrl_ops;
1445 pctl->pctl_desc.pmxops = &stm32_pmx_ops;
1446 pctl->dev = &pdev->dev;
1447
1448 pctl->pctl_dev = devm_pinctrl_register(&pdev->dev, &pctl->pctl_desc,
1449 pctl);
1450
1451 if (IS_ERR(pctl->pctl_dev)) {
1452 dev_err(&pdev->dev, "Failed pinctrl registration\n");
1453 return PTR_ERR(pctl->pctl_dev);
1454 }
1455
1456 for_each_available_child_of_node(np, child)
1457 if (of_property_read_bool(child, "gpio-controller"))
1458 banks++;
1459
1460 if (!banks) {
1461 dev_err(dev, "at least one GPIO bank is required\n");
1462 return -EINVAL;
1463 }
1464 pctl->banks = devm_kcalloc(dev, banks, sizeof(*pctl->banks),
1465 GFP_KERNEL);
1466 if (!pctl->banks)
1467 return -ENOMEM;
1468
1469 for_each_available_child_of_node(np, child) {
1470 if (of_property_read_bool(child, "gpio-controller")) {
1471 ret = stm32_gpiolib_register_bank(pctl, child);
1472 if (ret) {
1473 of_node_put(child);
1474 return ret;
1475 }
1476
1477 pctl->nbanks++;
1478 }
1479 }
1480
1481 dev_info(dev, "Pinctrl STM32 initialized\n");
1482
1483 return 0;
1484 }
1485
1486 static int __maybe_unused stm32_pinctrl_restore_gpio_regs(
1487 struct stm32_pinctrl *pctl, u32 pin)
1488 {
1489 const struct pin_desc *desc = pin_desc_get(pctl->pctl_dev, pin);
1490 u32 val, alt, mode, offset = stm32_gpio_pin(pin);
1491 struct pinctrl_gpio_range *range;
1492 struct stm32_gpio_bank *bank;
1493 bool pin_is_irq;
1494 int ret;
1495
1496 range = pinctrl_find_gpio_range_from_pin(pctl->pctl_dev, pin);
1497 if (!range)
1498 return 0;
1499
1500 pin_is_irq = gpiochip_line_is_irq(range->gc, offset);
1501
1502 if (!desc || (!pin_is_irq && !desc->gpio_owner))
1503 return 0;
1504
1505 bank = gpiochip_get_data(range->gc);
1506
1507 alt = bank->pin_backup[offset] & STM32_GPIO_BKP_ALT_MASK;
1508 alt >>= STM32_GPIO_BKP_ALT_SHIFT;
1509 mode = bank->pin_backup[offset] & STM32_GPIO_BKP_MODE_MASK;
1510 mode >>= STM32_GPIO_BKP_MODE_SHIFT;
1511
1512 ret = stm32_pmx_set_mode(bank, offset, mode, alt);
1513 if (ret)
1514 return ret;
1515
1516 if (mode == 1) {
1517 val = bank->pin_backup[offset] & BIT(STM32_GPIO_BKP_VAL);
1518 val = val >> STM32_GPIO_BKP_VAL;
1519 __stm32_gpio_set(bank, offset, val);
1520 }
1521
1522 val = bank->pin_backup[offset] & BIT(STM32_GPIO_BKP_TYPE);
1523 val >>= STM32_GPIO_BKP_TYPE;
1524 ret = stm32_pconf_set_driving(bank, offset, val);
1525 if (ret)
1526 return ret;
1527
1528 val = bank->pin_backup[offset] & STM32_GPIO_BKP_SPEED_MASK;
1529 val >>= STM32_GPIO_BKP_SPEED_SHIFT;
1530 ret = stm32_pconf_set_speed(bank, offset, val);
1531 if (ret)
1532 return ret;
1533
1534 val = bank->pin_backup[offset] & STM32_GPIO_BKP_PUPD_MASK;
1535 val >>= STM32_GPIO_BKP_PUPD_SHIFT;
1536 ret = stm32_pconf_set_bias(bank, offset, val);
1537 if (ret)
1538 return ret;
1539
1540 if (pin_is_irq)
1541 regmap_field_write(pctl->irqmux[offset], bank->bank_ioport_nr);
1542
1543 return 0;
1544 }
1545
1546 int __maybe_unused stm32_pinctrl_resume(struct device *dev)
1547 {
1548 struct stm32_pinctrl *pctl = dev_get_drvdata(dev);
1549 struct stm32_pinctrl_group *g = pctl->groups;
1550 int i;
1551
1552 for (i = g->pin; i < g->pin + pctl->ngroups; i++)
1553 stm32_pinctrl_restore_gpio_regs(pctl, i);
1554
1555 return 0;
1556 }
Linux with added FPC-III support