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_irq.h>
19 #include <linux/platform_device.h>
20 #include <linux/property.h>
21 #include <linux/regmap.h>
22 #include <linux/reset.h>
23 #include <linux/seq_file.h>
24 #include <linux/slab.h>
25
26 #include <linux/pinctrl/consumer.h>
27 #include <linux/pinctrl/machine.h>
28 #include <linux/pinctrl/pinconf-generic.h>
29 #include <linux/pinctrl/pinconf.h>
30 #include <linux/pinctrl/pinctrl.h>
31 #include <linux/pinctrl/pinmux.h>
32
33 #include "../core.h"
34 #include "../pinconf.h"
35 #include "../pinctrl-utils.h"
36 #include "pinctrl-stm32.h"
37
38 #define STM32_GPIO_MODER 0x00
39 #define STM32_GPIO_TYPER 0x04
40 #define STM32_GPIO_SPEEDR 0x08
41 #define STM32_GPIO_PUPDR 0x0c
42 #define STM32_GPIO_IDR 0x10
43 #define STM32_GPIO_ODR 0x14
44 #define STM32_GPIO_BSRR 0x18
45 #define STM32_GPIO_LCKR 0x1c
46 #define STM32_GPIO_AFRL 0x20
47 #define STM32_GPIO_AFRH 0x24
48 #define STM32_GPIO_SECCFGR 0x30
49
50 /* custom bitfield to backup pin status */
51 #define STM32_GPIO_BKP_MODE_SHIFT 0
52 #define STM32_GPIO_BKP_MODE_MASK GENMASK(1, 0)
53 #define STM32_GPIO_BKP_ALT_SHIFT 2
54 #define STM32_GPIO_BKP_ALT_MASK GENMASK(5, 2)
55 #define STM32_GPIO_BKP_SPEED_SHIFT 6
56 #define STM32_GPIO_BKP_SPEED_MASK GENMASK(7, 6)
57 #define STM32_GPIO_BKP_PUPD_SHIFT 8
58 #define STM32_GPIO_BKP_PUPD_MASK GENMASK(9, 8)
59 #define STM32_GPIO_BKP_TYPE 10
60 #define STM32_GPIO_BKP_VAL 11
61
62 #define STM32_GPIO_PINS_PER_BANK 16
63 #define STM32_GPIO_IRQ_LINE 16
64
65 #define SYSCFG_IRQMUX_MASK GENMASK(3, 0)
66
67 #define gpio_range_to_bank(chip) \
68 container_of(chip, struct stm32_gpio_bank, range)
69
70 #define HWSPNLCK_TIMEOUT 1000 /* usec */
71
72 static const char * const stm32_gpio_functions[] = {
73 "gpio", "af0", "af1",
74 "af2", "af3", "af4",
75 "af5", "af6", "af7",
76 "af8", "af9", "af10",
77 "af11", "af12", "af13",
78 "af14", "af15", "analog",
79 };
80
81 struct stm32_pinctrl_group {
82 const char *name;
83 unsigned long config;
84 unsigned pin;
85 };
86
87 struct stm32_gpio_bank {
88 void __iomem *base;
89 struct clk *clk;
90 struct reset_control *rstc;
91 spinlock_t lock;
92 struct gpio_chip gpio_chip;
93 struct pinctrl_gpio_range range;
94 struct fwnode_handle *fwnode;
95 struct irq_domain *domain;
96 u32 bank_nr;
97 u32 bank_ioport_nr;
98 u32 pin_backup[STM32_GPIO_PINS_PER_BANK];
99 u8 irq_type[STM32_GPIO_PINS_PER_BANK];
100 bool secure_control;
101 };
102
103 struct stm32_pinctrl {
104 struct device *dev;
105 struct pinctrl_dev *pctl_dev;
106 struct pinctrl_desc pctl_desc;
107 struct stm32_pinctrl_group *groups;
108 unsigned ngroups;
109 const char **grp_names;
110 struct stm32_gpio_bank *banks;
111 unsigned nbanks;
112 const struct stm32_pinctrl_match_data *match_data;
113 struct irq_domain *domain;
114 struct regmap *regmap;
115 struct regmap_field *irqmux[STM32_GPIO_PINS_PER_BANK];
116 struct hwspinlock *hwlock;
117 struct stm32_desc_pin *pins;
118 u32 npins;
119 u32 pkg;
120 u16 irqmux_map;
121 spinlock_t irqmux_lock;
122 };
123
stm32_gpio_pin(int gpio)124 static inline int stm32_gpio_pin(int gpio)
125 {
126 return gpio % STM32_GPIO_PINS_PER_BANK;
127 }
128
stm32_gpio_get_mode(u32 function)129 static inline u32 stm32_gpio_get_mode(u32 function)
130 {
131 switch (function) {
132 case STM32_PIN_GPIO:
133 return 0;
134 case STM32_PIN_AF(0) ... STM32_PIN_AF(15):
135 return 2;
136 case STM32_PIN_ANALOG:
137 return 3;
138 }
139
140 return 0;
141 }
142
stm32_gpio_get_alt(u32 function)143 static inline u32 stm32_gpio_get_alt(u32 function)
144 {
145 switch (function) {
146 case STM32_PIN_GPIO:
147 return 0;
148 case STM32_PIN_AF(0) ... STM32_PIN_AF(15):
149 return function - 1;
150 case STM32_PIN_ANALOG:
151 return 0;
152 }
153
154 return 0;
155 }
156
stm32_gpio_backup_value(struct stm32_gpio_bank * bank,u32 offset,u32 value)157 static void stm32_gpio_backup_value(struct stm32_gpio_bank *bank,
158 u32 offset, u32 value)
159 {
160 bank->pin_backup[offset] &= ~BIT(STM32_GPIO_BKP_VAL);
161 bank->pin_backup[offset] |= value << STM32_GPIO_BKP_VAL;
162 }
163
stm32_gpio_backup_mode(struct stm32_gpio_bank * bank,u32 offset,u32 mode,u32 alt)164 static void stm32_gpio_backup_mode(struct stm32_gpio_bank *bank, u32 offset,
165 u32 mode, u32 alt)
166 {
167 bank->pin_backup[offset] &= ~(STM32_GPIO_BKP_MODE_MASK |
168 STM32_GPIO_BKP_ALT_MASK);
169 bank->pin_backup[offset] |= mode << STM32_GPIO_BKP_MODE_SHIFT;
170 bank->pin_backup[offset] |= alt << STM32_GPIO_BKP_ALT_SHIFT;
171 }
172
stm32_gpio_backup_driving(struct stm32_gpio_bank * bank,u32 offset,u32 drive)173 static void stm32_gpio_backup_driving(struct stm32_gpio_bank *bank, u32 offset,
174 u32 drive)
175 {
176 bank->pin_backup[offset] &= ~BIT(STM32_GPIO_BKP_TYPE);
177 bank->pin_backup[offset] |= drive << STM32_GPIO_BKP_TYPE;
178 }
179
stm32_gpio_backup_speed(struct stm32_gpio_bank * bank,u32 offset,u32 speed)180 static void stm32_gpio_backup_speed(struct stm32_gpio_bank *bank, u32 offset,
181 u32 speed)
182 {
183 bank->pin_backup[offset] &= ~STM32_GPIO_BKP_SPEED_MASK;
184 bank->pin_backup[offset] |= speed << STM32_GPIO_BKP_SPEED_SHIFT;
185 }
186
stm32_gpio_backup_bias(struct stm32_gpio_bank * bank,u32 offset,u32 bias)187 static void stm32_gpio_backup_bias(struct stm32_gpio_bank *bank, u32 offset,
188 u32 bias)
189 {
190 bank->pin_backup[offset] &= ~STM32_GPIO_BKP_PUPD_MASK;
191 bank->pin_backup[offset] |= bias << STM32_GPIO_BKP_PUPD_SHIFT;
192 }
193
194 /* GPIO functions */
195
__stm32_gpio_set(struct stm32_gpio_bank * bank,unsigned offset,int value)196 static inline void __stm32_gpio_set(struct stm32_gpio_bank *bank,
197 unsigned offset, int value)
198 {
199 stm32_gpio_backup_value(bank, offset, value);
200
201 if (!value)
202 offset += STM32_GPIO_PINS_PER_BANK;
203
204 writel_relaxed(BIT(offset), bank->base + STM32_GPIO_BSRR);
205 }
206
stm32_gpio_request(struct gpio_chip * chip,unsigned offset)207 static int stm32_gpio_request(struct gpio_chip *chip, unsigned offset)
208 {
209 struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
210 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
211 struct pinctrl_gpio_range *range;
212 int pin = offset + (bank->bank_nr * STM32_GPIO_PINS_PER_BANK);
213
214 range = pinctrl_find_gpio_range_from_pin_nolock(pctl->pctl_dev, pin);
215 if (!range) {
216 dev_err(pctl->dev, "pin %d not in range.\n", pin);
217 return -EINVAL;
218 }
219
220 return pinctrl_gpio_request(chip, offset);
221 }
222
stm32_gpio_get(struct gpio_chip * chip,unsigned offset)223 static int stm32_gpio_get(struct gpio_chip *chip, unsigned offset)
224 {
225 struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
226
227 return !!(readl_relaxed(bank->base + STM32_GPIO_IDR) & BIT(offset));
228 }
229
stm32_gpio_set(struct gpio_chip * chip,unsigned offset,int value)230 static void stm32_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
231 {
232 struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
233
234 __stm32_gpio_set(bank, offset, value);
235 }
236
stm32_gpio_direction_output(struct gpio_chip * chip,unsigned offset,int value)237 static int stm32_gpio_direction_output(struct gpio_chip *chip,
238 unsigned offset, int value)
239 {
240 struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
241
242 __stm32_gpio_set(bank, offset, value);
243
244 return pinctrl_gpio_direction_output(chip, offset);
245 }
246
247
stm32_gpio_to_irq(struct gpio_chip * chip,unsigned int offset)248 static int stm32_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
249 {
250 struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
251 struct irq_fwspec fwspec;
252
253 fwspec.fwnode = bank->fwnode;
254 fwspec.param_count = 2;
255 fwspec.param[0] = offset;
256 fwspec.param[1] = IRQ_TYPE_NONE;
257
258 return irq_create_fwspec_mapping(&fwspec);
259 }
260
stm32_gpio_get_direction(struct gpio_chip * chip,unsigned int offset)261 static int stm32_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
262 {
263 struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
264 int pin = stm32_gpio_pin(offset);
265 int ret;
266 u32 mode, alt;
267
268 stm32_pmx_get_mode(bank, pin, &mode, &alt);
269 if ((alt == 0) && (mode == 0))
270 ret = GPIO_LINE_DIRECTION_IN;
271 else if ((alt == 0) && (mode == 1))
272 ret = GPIO_LINE_DIRECTION_OUT;
273 else
274 ret = -EINVAL;
275
276 return ret;
277 }
278
stm32_gpio_init_valid_mask(struct gpio_chip * chip,unsigned long * valid_mask,unsigned int ngpios)279 static int stm32_gpio_init_valid_mask(struct gpio_chip *chip,
280 unsigned long *valid_mask,
281 unsigned int ngpios)
282 {
283 struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
284 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
285 unsigned int i;
286 u32 sec;
287
288 /* All gpio are valid per default */
289 bitmap_fill(valid_mask, ngpios);
290
291 if (bank->secure_control) {
292 /* Tag secured pins as invalid */
293 sec = readl_relaxed(bank->base + STM32_GPIO_SECCFGR);
294
295 for (i = 0; i < ngpios; i++) {
296 if (sec & BIT(i)) {
297 clear_bit(i, valid_mask);
298 dev_dbg(pctl->dev, "No access to gpio %d - %d\n", bank->bank_nr, i);
299 }
300 }
301 }
302
303 return 0;
304 }
305
306 static const struct gpio_chip stm32_gpio_template = {
307 .request = stm32_gpio_request,
308 .free = pinctrl_gpio_free,
309 .get = stm32_gpio_get,
310 .set = stm32_gpio_set,
311 .direction_input = pinctrl_gpio_direction_input,
312 .direction_output = stm32_gpio_direction_output,
313 .to_irq = stm32_gpio_to_irq,
314 .get_direction = stm32_gpio_get_direction,
315 .set_config = gpiochip_generic_config,
316 .init_valid_mask = stm32_gpio_init_valid_mask,
317 };
318
stm32_gpio_irq_trigger(struct irq_data * d)319 static void stm32_gpio_irq_trigger(struct irq_data *d)
320 {
321 struct stm32_gpio_bank *bank = d->domain->host_data;
322 int level;
323
324 /* Do not access the GPIO if this is not LEVEL triggered IRQ. */
325 if (!(bank->irq_type[d->hwirq] & IRQ_TYPE_LEVEL_MASK))
326 return;
327
328 /* If level interrupt type then retrig */
329 level = stm32_gpio_get(&bank->gpio_chip, d->hwirq);
330 if ((level == 0 && bank->irq_type[d->hwirq] == IRQ_TYPE_LEVEL_LOW) ||
331 (level == 1 && bank->irq_type[d->hwirq] == IRQ_TYPE_LEVEL_HIGH))
332 irq_chip_retrigger_hierarchy(d);
333 }
334
stm32_gpio_irq_eoi(struct irq_data * d)335 static void stm32_gpio_irq_eoi(struct irq_data *d)
336 {
337 irq_chip_eoi_parent(d);
338 stm32_gpio_irq_trigger(d);
339 };
340
stm32_gpio_set_type(struct irq_data * d,unsigned int type)341 static int stm32_gpio_set_type(struct irq_data *d, unsigned int type)
342 {
343 struct stm32_gpio_bank *bank = d->domain->host_data;
344 u32 parent_type;
345
346 switch (type) {
347 case IRQ_TYPE_EDGE_RISING:
348 case IRQ_TYPE_EDGE_FALLING:
349 case IRQ_TYPE_EDGE_BOTH:
350 parent_type = type;
351 break;
352 case IRQ_TYPE_LEVEL_HIGH:
353 parent_type = IRQ_TYPE_EDGE_RISING;
354 break;
355 case IRQ_TYPE_LEVEL_LOW:
356 parent_type = IRQ_TYPE_EDGE_FALLING;
357 break;
358 default:
359 return -EINVAL;
360 }
361
362 bank->irq_type[d->hwirq] = type;
363
364 return irq_chip_set_type_parent(d, parent_type);
365 };
366
stm32_gpio_irq_request_resources(struct irq_data * irq_data)367 static int stm32_gpio_irq_request_resources(struct irq_data *irq_data)
368 {
369 struct stm32_gpio_bank *bank = irq_data->domain->host_data;
370 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
371 int ret;
372
373 ret = pinctrl_gpio_direction_input(&bank->gpio_chip, irq_data->hwirq);
374 if (ret)
375 return ret;
376
377 ret = gpiochip_lock_as_irq(&bank->gpio_chip, irq_data->hwirq);
378 if (ret) {
379 dev_err(pctl->dev, "unable to lock HW IRQ %lu for IRQ\n",
380 irq_data->hwirq);
381 return ret;
382 }
383
384 return 0;
385 }
386
stm32_gpio_irq_release_resources(struct irq_data * irq_data)387 static void stm32_gpio_irq_release_resources(struct irq_data *irq_data)
388 {
389 struct stm32_gpio_bank *bank = irq_data->domain->host_data;
390
391 gpiochip_unlock_as_irq(&bank->gpio_chip, irq_data->hwirq);
392 }
393
stm32_gpio_irq_unmask(struct irq_data * d)394 static void stm32_gpio_irq_unmask(struct irq_data *d)
395 {
396 irq_chip_unmask_parent(d);
397 stm32_gpio_irq_trigger(d);
398 }
399
400 static struct irq_chip stm32_gpio_irq_chip = {
401 .name = "stm32gpio",
402 .irq_eoi = stm32_gpio_irq_eoi,
403 .irq_ack = irq_chip_ack_parent,
404 .irq_mask = irq_chip_mask_parent,
405 .irq_unmask = stm32_gpio_irq_unmask,
406 .irq_set_type = stm32_gpio_set_type,
407 .irq_set_wake = irq_chip_set_wake_parent,
408 .irq_request_resources = stm32_gpio_irq_request_resources,
409 .irq_release_resources = stm32_gpio_irq_release_resources,
410 };
411
stm32_gpio_domain_translate(struct irq_domain * d,struct irq_fwspec * fwspec,unsigned long * hwirq,unsigned int * type)412 static int stm32_gpio_domain_translate(struct irq_domain *d,
413 struct irq_fwspec *fwspec,
414 unsigned long *hwirq,
415 unsigned int *type)
416 {
417 if ((fwspec->param_count != 2) ||
418 (fwspec->param[0] >= STM32_GPIO_IRQ_LINE))
419 return -EINVAL;
420
421 *hwirq = fwspec->param[0];
422 *type = fwspec->param[1];
423 return 0;
424 }
425
stm32_gpio_domain_activate(struct irq_domain * d,struct irq_data * irq_data,bool reserve)426 static int stm32_gpio_domain_activate(struct irq_domain *d,
427 struct irq_data *irq_data, bool reserve)
428 {
429 struct stm32_gpio_bank *bank = d->host_data;
430 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
431 int ret = 0;
432
433 if (pctl->hwlock) {
434 ret = hwspin_lock_timeout_in_atomic(pctl->hwlock,
435 HWSPNLCK_TIMEOUT);
436 if (ret) {
437 dev_err(pctl->dev, "Can't get hwspinlock\n");
438 return ret;
439 }
440 }
441
442 regmap_field_write(pctl->irqmux[irq_data->hwirq], bank->bank_ioport_nr);
443
444 if (pctl->hwlock)
445 hwspin_unlock_in_atomic(pctl->hwlock);
446
447 return ret;
448 }
449
stm32_gpio_domain_alloc(struct irq_domain * d,unsigned int virq,unsigned int nr_irqs,void * data)450 static int stm32_gpio_domain_alloc(struct irq_domain *d,
451 unsigned int virq,
452 unsigned int nr_irqs, void *data)
453 {
454 struct stm32_gpio_bank *bank = d->host_data;
455 struct irq_fwspec *fwspec = data;
456 struct irq_fwspec parent_fwspec;
457 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
458 irq_hw_number_t hwirq = fwspec->param[0];
459 unsigned long flags;
460 int ret = 0;
461
462 /*
463 * Check first that the IRQ MUX of that line is free.
464 * gpio irq mux is shared between several banks, protect with a lock
465 */
466 spin_lock_irqsave(&pctl->irqmux_lock, flags);
467
468 if (pctl->irqmux_map & BIT(hwirq)) {
469 dev_err(pctl->dev, "irq line %ld already requested.\n", hwirq);
470 ret = -EBUSY;
471 } else {
472 pctl->irqmux_map |= BIT(hwirq);
473 }
474
475 spin_unlock_irqrestore(&pctl->irqmux_lock, flags);
476 if (ret)
477 return ret;
478
479 parent_fwspec.fwnode = d->parent->fwnode;
480 parent_fwspec.param_count = 2;
481 parent_fwspec.param[0] = fwspec->param[0];
482 parent_fwspec.param[1] = fwspec->param[1];
483
484 irq_domain_set_hwirq_and_chip(d, virq, hwirq, &stm32_gpio_irq_chip,
485 bank);
486
487 return irq_domain_alloc_irqs_parent(d, virq, nr_irqs, &parent_fwspec);
488 }
489
stm32_gpio_domain_free(struct irq_domain * d,unsigned int virq,unsigned int nr_irqs)490 static void stm32_gpio_domain_free(struct irq_domain *d, unsigned int virq,
491 unsigned int nr_irqs)
492 {
493 struct stm32_gpio_bank *bank = d->host_data;
494 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
495 struct irq_data *irq_data = irq_domain_get_irq_data(d, virq);
496 unsigned long flags, hwirq = irq_data->hwirq;
497
498 irq_domain_free_irqs_common(d, virq, nr_irqs);
499
500 spin_lock_irqsave(&pctl->irqmux_lock, flags);
501 pctl->irqmux_map &= ~BIT(hwirq);
502 spin_unlock_irqrestore(&pctl->irqmux_lock, flags);
503 }
504
505 static const struct irq_domain_ops stm32_gpio_domain_ops = {
506 .translate = stm32_gpio_domain_translate,
507 .alloc = stm32_gpio_domain_alloc,
508 .free = stm32_gpio_domain_free,
509 .activate = stm32_gpio_domain_activate,
510 };
511
512 /* Pinctrl functions */
513 static struct stm32_pinctrl_group *
stm32_pctrl_find_group_by_pin(struct stm32_pinctrl * pctl,u32 pin)514 stm32_pctrl_find_group_by_pin(struct stm32_pinctrl *pctl, u32 pin)
515 {
516 int i;
517
518 for (i = 0; i < pctl->ngroups; i++) {
519 struct stm32_pinctrl_group *grp = pctl->groups + i;
520
521 if (grp->pin == pin)
522 return grp;
523 }
524
525 return NULL;
526 }
527
stm32_pctrl_is_function_valid(struct stm32_pinctrl * pctl,u32 pin_num,u32 fnum)528 static bool stm32_pctrl_is_function_valid(struct stm32_pinctrl *pctl,
529 u32 pin_num, u32 fnum)
530 {
531 int i, k;
532
533 for (i = 0; i < pctl->npins; i++) {
534 const struct stm32_desc_pin *pin = pctl->pins + i;
535 const struct stm32_desc_function *func = pin->functions;
536
537 if (pin->pin.number != pin_num)
538 continue;
539
540 for (k = 0; k < STM32_CONFIG_NUM; k++) {
541 if (func->num == fnum)
542 return true;
543 func++;
544 }
545
546 break;
547 }
548
549 dev_err(pctl->dev, "invalid function %d on pin %d .\n", fnum, pin_num);
550
551 return false;
552 }
553
stm32_pctrl_dt_node_to_map_func(struct stm32_pinctrl * pctl,u32 pin,u32 fnum,struct stm32_pinctrl_group * grp,struct pinctrl_map ** map,unsigned * reserved_maps,unsigned * num_maps)554 static int stm32_pctrl_dt_node_to_map_func(struct stm32_pinctrl *pctl,
555 u32 pin, u32 fnum, struct stm32_pinctrl_group *grp,
556 struct pinctrl_map **map, unsigned *reserved_maps,
557 unsigned *num_maps)
558 {
559 if (*num_maps == *reserved_maps)
560 return -ENOSPC;
561
562 (*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
563 (*map)[*num_maps].data.mux.group = grp->name;
564
565 if (!stm32_pctrl_is_function_valid(pctl, pin, fnum))
566 return -EINVAL;
567
568 (*map)[*num_maps].data.mux.function = stm32_gpio_functions[fnum];
569 (*num_maps)++;
570
571 return 0;
572 }
573
stm32_pctrl_dt_subnode_to_map(struct pinctrl_dev * pctldev,struct device_node * node,struct pinctrl_map ** map,unsigned * reserved_maps,unsigned * num_maps)574 static int stm32_pctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
575 struct device_node *node,
576 struct pinctrl_map **map,
577 unsigned *reserved_maps,
578 unsigned *num_maps)
579 {
580 struct stm32_pinctrl *pctl;
581 struct stm32_pinctrl_group *grp;
582 struct property *pins;
583 u32 pinfunc, pin, func;
584 unsigned long *configs;
585 unsigned int num_configs;
586 bool has_config = 0;
587 unsigned reserve = 0;
588 int num_pins, num_funcs, maps_per_pin, i, err = 0;
589
590 pctl = pinctrl_dev_get_drvdata(pctldev);
591
592 pins = of_find_property(node, "pinmux", NULL);
593 if (!pins) {
594 dev_err(pctl->dev, "missing pins property in node %pOFn .\n",
595 node);
596 return -EINVAL;
597 }
598
599 err = pinconf_generic_parse_dt_config(node, pctldev, &configs,
600 &num_configs);
601 if (err)
602 return err;
603
604 if (num_configs)
605 has_config = 1;
606
607 num_pins = pins->length / sizeof(u32);
608 num_funcs = num_pins;
609 maps_per_pin = 0;
610 if (num_funcs)
611 maps_per_pin++;
612 if (has_config && num_pins >= 1)
613 maps_per_pin++;
614
615 if (!num_pins || !maps_per_pin) {
616 err = -EINVAL;
617 goto exit;
618 }
619
620 reserve = num_pins * maps_per_pin;
621
622 err = pinctrl_utils_reserve_map(pctldev, map,
623 reserved_maps, num_maps, reserve);
624 if (err)
625 goto exit;
626
627 for (i = 0; i < num_pins; i++) {
628 err = of_property_read_u32_index(node, "pinmux",
629 i, &pinfunc);
630 if (err)
631 goto exit;
632
633 pin = STM32_GET_PIN_NO(pinfunc);
634 func = STM32_GET_PIN_FUNC(pinfunc);
635
636 if (!stm32_pctrl_is_function_valid(pctl, pin, func)) {
637 err = -EINVAL;
638 goto exit;
639 }
640
641 grp = stm32_pctrl_find_group_by_pin(pctl, pin);
642 if (!grp) {
643 dev_err(pctl->dev, "unable to match pin %d to group\n",
644 pin);
645 err = -EINVAL;
646 goto exit;
647 }
648
649 err = stm32_pctrl_dt_node_to_map_func(pctl, pin, func, grp, map,
650 reserved_maps, num_maps);
651 if (err)
652 goto exit;
653
654 if (has_config) {
655 err = pinctrl_utils_add_map_configs(pctldev, map,
656 reserved_maps, num_maps, grp->name,
657 configs, num_configs,
658 PIN_MAP_TYPE_CONFIGS_GROUP);
659 if (err)
660 goto exit;
661 }
662 }
663
664 exit:
665 kfree(configs);
666 return err;
667 }
668
stm32_pctrl_dt_node_to_map(struct pinctrl_dev * pctldev,struct device_node * np_config,struct pinctrl_map ** map,unsigned * num_maps)669 static int stm32_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
670 struct device_node *np_config,
671 struct pinctrl_map **map, unsigned *num_maps)
672 {
673 struct device_node *np;
674 unsigned reserved_maps;
675 int ret;
676
677 *map = NULL;
678 *num_maps = 0;
679 reserved_maps = 0;
680
681 for_each_child_of_node(np_config, np) {
682 ret = stm32_pctrl_dt_subnode_to_map(pctldev, np, map,
683 &reserved_maps, num_maps);
684 if (ret < 0) {
685 pinctrl_utils_free_map(pctldev, *map, *num_maps);
686 of_node_put(np);
687 return ret;
688 }
689 }
690
691 return 0;
692 }
693
stm32_pctrl_get_groups_count(struct pinctrl_dev * pctldev)694 static int stm32_pctrl_get_groups_count(struct pinctrl_dev *pctldev)
695 {
696 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
697
698 return pctl->ngroups;
699 }
700
stm32_pctrl_get_group_name(struct pinctrl_dev * pctldev,unsigned group)701 static const char *stm32_pctrl_get_group_name(struct pinctrl_dev *pctldev,
702 unsigned group)
703 {
704 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
705
706 return pctl->groups[group].name;
707 }
708
stm32_pctrl_get_group_pins(struct pinctrl_dev * pctldev,unsigned group,const unsigned ** pins,unsigned * num_pins)709 static int stm32_pctrl_get_group_pins(struct pinctrl_dev *pctldev,
710 unsigned group,
711 const unsigned **pins,
712 unsigned *num_pins)
713 {
714 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
715
716 *pins = (unsigned *)&pctl->groups[group].pin;
717 *num_pins = 1;
718
719 return 0;
720 }
721
722 static const struct pinctrl_ops stm32_pctrl_ops = {
723 .dt_node_to_map = stm32_pctrl_dt_node_to_map,
724 .dt_free_map = pinctrl_utils_free_map,
725 .get_groups_count = stm32_pctrl_get_groups_count,
726 .get_group_name = stm32_pctrl_get_group_name,
727 .get_group_pins = stm32_pctrl_get_group_pins,
728 };
729
730
731 /* Pinmux functions */
732
stm32_pmx_get_funcs_cnt(struct pinctrl_dev * pctldev)733 static int stm32_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev)
734 {
735 return ARRAY_SIZE(stm32_gpio_functions);
736 }
737
stm32_pmx_get_func_name(struct pinctrl_dev * pctldev,unsigned selector)738 static const char *stm32_pmx_get_func_name(struct pinctrl_dev *pctldev,
739 unsigned selector)
740 {
741 return stm32_gpio_functions[selector];
742 }
743
stm32_pmx_get_func_groups(struct pinctrl_dev * pctldev,unsigned function,const char * const ** groups,unsigned * const num_groups)744 static int stm32_pmx_get_func_groups(struct pinctrl_dev *pctldev,
745 unsigned function,
746 const char * const **groups,
747 unsigned * const num_groups)
748 {
749 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
750
751 *groups = pctl->grp_names;
752 *num_groups = pctl->ngroups;
753
754 return 0;
755 }
756
stm32_pmx_set_mode(struct stm32_gpio_bank * bank,int pin,u32 mode,u32 alt)757 static int stm32_pmx_set_mode(struct stm32_gpio_bank *bank,
758 int pin, u32 mode, u32 alt)
759 {
760 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
761 u32 val;
762 int alt_shift = (pin % 8) * 4;
763 int alt_offset = STM32_GPIO_AFRL + (pin / 8) * 4;
764 unsigned long flags;
765 int err = 0;
766
767 spin_lock_irqsave(&bank->lock, flags);
768
769 if (pctl->hwlock) {
770 err = hwspin_lock_timeout_in_atomic(pctl->hwlock,
771 HWSPNLCK_TIMEOUT);
772 if (err) {
773 dev_err(pctl->dev, "Can't get hwspinlock\n");
774 goto unlock;
775 }
776 }
777
778 val = readl_relaxed(bank->base + alt_offset);
779 val &= ~GENMASK(alt_shift + 3, alt_shift);
780 val |= (alt << alt_shift);
781 writel_relaxed(val, bank->base + alt_offset);
782
783 val = readl_relaxed(bank->base + STM32_GPIO_MODER);
784 val &= ~GENMASK(pin * 2 + 1, pin * 2);
785 val |= mode << (pin * 2);
786 writel_relaxed(val, bank->base + STM32_GPIO_MODER);
787
788 if (pctl->hwlock)
789 hwspin_unlock_in_atomic(pctl->hwlock);
790
791 stm32_gpio_backup_mode(bank, pin, mode, alt);
792
793 unlock:
794 spin_unlock_irqrestore(&bank->lock, flags);
795
796 return err;
797 }
798
stm32_pmx_get_mode(struct stm32_gpio_bank * bank,int pin,u32 * mode,u32 * alt)799 void stm32_pmx_get_mode(struct stm32_gpio_bank *bank, int pin, u32 *mode,
800 u32 *alt)
801 {
802 u32 val;
803 int alt_shift = (pin % 8) * 4;
804 int alt_offset = STM32_GPIO_AFRL + (pin / 8) * 4;
805 unsigned long flags;
806
807 spin_lock_irqsave(&bank->lock, flags);
808
809 val = readl_relaxed(bank->base + alt_offset);
810 val &= GENMASK(alt_shift + 3, alt_shift);
811 *alt = val >> alt_shift;
812
813 val = readl_relaxed(bank->base + STM32_GPIO_MODER);
814 val &= GENMASK(pin * 2 + 1, pin * 2);
815 *mode = val >> (pin * 2);
816
817 spin_unlock_irqrestore(&bank->lock, flags);
818 }
819
stm32_pmx_set_mux(struct pinctrl_dev * pctldev,unsigned function,unsigned group)820 static int stm32_pmx_set_mux(struct pinctrl_dev *pctldev,
821 unsigned function,
822 unsigned group)
823 {
824 bool ret;
825 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
826 struct stm32_pinctrl_group *g = pctl->groups + group;
827 struct pinctrl_gpio_range *range;
828 struct stm32_gpio_bank *bank;
829 u32 mode, alt;
830 int pin;
831
832 ret = stm32_pctrl_is_function_valid(pctl, g->pin, function);
833 if (!ret)
834 return -EINVAL;
835
836 range = pinctrl_find_gpio_range_from_pin(pctldev, g->pin);
837 if (!range) {
838 dev_err(pctl->dev, "No gpio range defined.\n");
839 return -EINVAL;
840 }
841
842 bank = gpiochip_get_data(range->gc);
843 pin = stm32_gpio_pin(g->pin);
844
845 mode = stm32_gpio_get_mode(function);
846 alt = stm32_gpio_get_alt(function);
847
848 return stm32_pmx_set_mode(bank, pin, mode, alt);
849 }
850
stm32_pmx_gpio_set_direction(struct pinctrl_dev * pctldev,struct pinctrl_gpio_range * range,unsigned gpio,bool input)851 static int stm32_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
852 struct pinctrl_gpio_range *range, unsigned gpio,
853 bool input)
854 {
855 struct stm32_gpio_bank *bank = gpiochip_get_data(range->gc);
856 int pin = stm32_gpio_pin(gpio);
857
858 return stm32_pmx_set_mode(bank, pin, !input, 0);
859 }
860
stm32_pmx_request(struct pinctrl_dev * pctldev,unsigned int gpio)861 static int stm32_pmx_request(struct pinctrl_dev *pctldev, unsigned int gpio)
862 {
863 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
864 struct pinctrl_gpio_range *range;
865
866 range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, gpio);
867 if (!range) {
868 dev_err(pctl->dev, "No gpio range defined.\n");
869 return -EINVAL;
870 }
871
872 if (!gpiochip_line_is_valid(range->gc, stm32_gpio_pin(gpio))) {
873 dev_warn(pctl->dev, "Can't access gpio %d\n", gpio);
874 return -EACCES;
875 }
876
877 return 0;
878 }
879
880 static const struct pinmux_ops stm32_pmx_ops = {
881 .get_functions_count = stm32_pmx_get_funcs_cnt,
882 .get_function_name = stm32_pmx_get_func_name,
883 .get_function_groups = stm32_pmx_get_func_groups,
884 .set_mux = stm32_pmx_set_mux,
885 .gpio_set_direction = stm32_pmx_gpio_set_direction,
886 .request = stm32_pmx_request,
887 .strict = true,
888 };
889
890 /* Pinconf functions */
891
stm32_pconf_set_driving(struct stm32_gpio_bank * bank,unsigned offset,u32 drive)892 static int stm32_pconf_set_driving(struct stm32_gpio_bank *bank,
893 unsigned offset, u32 drive)
894 {
895 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
896 unsigned long flags;
897 u32 val;
898 int err = 0;
899
900 spin_lock_irqsave(&bank->lock, flags);
901
902 if (pctl->hwlock) {
903 err = hwspin_lock_timeout_in_atomic(pctl->hwlock,
904 HWSPNLCK_TIMEOUT);
905 if (err) {
906 dev_err(pctl->dev, "Can't get hwspinlock\n");
907 goto unlock;
908 }
909 }
910
911 val = readl_relaxed(bank->base + STM32_GPIO_TYPER);
912 val &= ~BIT(offset);
913 val |= drive << offset;
914 writel_relaxed(val, bank->base + STM32_GPIO_TYPER);
915
916 if (pctl->hwlock)
917 hwspin_unlock_in_atomic(pctl->hwlock);
918
919 stm32_gpio_backup_driving(bank, offset, drive);
920
921 unlock:
922 spin_unlock_irqrestore(&bank->lock, flags);
923
924 return err;
925 }
926
stm32_pconf_get_driving(struct stm32_gpio_bank * bank,unsigned int offset)927 static u32 stm32_pconf_get_driving(struct stm32_gpio_bank *bank,
928 unsigned int offset)
929 {
930 unsigned long flags;
931 u32 val;
932
933 spin_lock_irqsave(&bank->lock, flags);
934
935 val = readl_relaxed(bank->base + STM32_GPIO_TYPER);
936 val &= BIT(offset);
937
938 spin_unlock_irqrestore(&bank->lock, flags);
939
940 return (val >> offset);
941 }
942
stm32_pconf_set_speed(struct stm32_gpio_bank * bank,unsigned offset,u32 speed)943 static int stm32_pconf_set_speed(struct stm32_gpio_bank *bank,
944 unsigned offset, u32 speed)
945 {
946 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
947 unsigned long flags;
948 u32 val;
949 int err = 0;
950
951 spin_lock_irqsave(&bank->lock, flags);
952
953 if (pctl->hwlock) {
954 err = hwspin_lock_timeout_in_atomic(pctl->hwlock,
955 HWSPNLCK_TIMEOUT);
956 if (err) {
957 dev_err(pctl->dev, "Can't get hwspinlock\n");
958 goto unlock;
959 }
960 }
961
962 val = readl_relaxed(bank->base + STM32_GPIO_SPEEDR);
963 val &= ~GENMASK(offset * 2 + 1, offset * 2);
964 val |= speed << (offset * 2);
965 writel_relaxed(val, bank->base + STM32_GPIO_SPEEDR);
966
967 if (pctl->hwlock)
968 hwspin_unlock_in_atomic(pctl->hwlock);
969
970 stm32_gpio_backup_speed(bank, offset, speed);
971
972 unlock:
973 spin_unlock_irqrestore(&bank->lock, flags);
974
975 return err;
976 }
977
stm32_pconf_get_speed(struct stm32_gpio_bank * bank,unsigned int offset)978 static u32 stm32_pconf_get_speed(struct stm32_gpio_bank *bank,
979 unsigned int offset)
980 {
981 unsigned long flags;
982 u32 val;
983
984 spin_lock_irqsave(&bank->lock, flags);
985
986 val = readl_relaxed(bank->base + STM32_GPIO_SPEEDR);
987 val &= GENMASK(offset * 2 + 1, offset * 2);
988
989 spin_unlock_irqrestore(&bank->lock, flags);
990
991 return (val >> (offset * 2));
992 }
993
stm32_pconf_set_bias(struct stm32_gpio_bank * bank,unsigned offset,u32 bias)994 static int stm32_pconf_set_bias(struct stm32_gpio_bank *bank,
995 unsigned offset, u32 bias)
996 {
997 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
998 unsigned long flags;
999 u32 val;
1000 int err = 0;
1001
1002 spin_lock_irqsave(&bank->lock, flags);
1003
1004 if (pctl->hwlock) {
1005 err = hwspin_lock_timeout_in_atomic(pctl->hwlock,
1006 HWSPNLCK_TIMEOUT);
1007 if (err) {
1008 dev_err(pctl->dev, "Can't get hwspinlock\n");
1009 goto unlock;
1010 }
1011 }
1012
1013 val = readl_relaxed(bank->base + STM32_GPIO_PUPDR);
1014 val &= ~GENMASK(offset * 2 + 1, offset * 2);
1015 val |= bias << (offset * 2);
1016 writel_relaxed(val, bank->base + STM32_GPIO_PUPDR);
1017
1018 if (pctl->hwlock)
1019 hwspin_unlock_in_atomic(pctl->hwlock);
1020
1021 stm32_gpio_backup_bias(bank, offset, bias);
1022
1023 unlock:
1024 spin_unlock_irqrestore(&bank->lock, flags);
1025
1026 return err;
1027 }
1028
stm32_pconf_get_bias(struct stm32_gpio_bank * bank,unsigned int offset)1029 static u32 stm32_pconf_get_bias(struct stm32_gpio_bank *bank,
1030 unsigned int offset)
1031 {
1032 unsigned long flags;
1033 u32 val;
1034
1035 spin_lock_irqsave(&bank->lock, flags);
1036
1037 val = readl_relaxed(bank->base + STM32_GPIO_PUPDR);
1038 val &= GENMASK(offset * 2 + 1, offset * 2);
1039
1040 spin_unlock_irqrestore(&bank->lock, flags);
1041
1042 return (val >> (offset * 2));
1043 }
1044
stm32_pconf_get(struct stm32_gpio_bank * bank,unsigned int offset,bool dir)1045 static bool stm32_pconf_get(struct stm32_gpio_bank *bank,
1046 unsigned int offset, bool dir)
1047 {
1048 unsigned long flags;
1049 u32 val;
1050
1051 spin_lock_irqsave(&bank->lock, flags);
1052
1053 if (dir)
1054 val = !!(readl_relaxed(bank->base + STM32_GPIO_IDR) &
1055 BIT(offset));
1056 else
1057 val = !!(readl_relaxed(bank->base + STM32_GPIO_ODR) &
1058 BIT(offset));
1059
1060 spin_unlock_irqrestore(&bank->lock, flags);
1061
1062 return val;
1063 }
1064
stm32_pconf_parse_conf(struct pinctrl_dev * pctldev,unsigned int pin,enum pin_config_param param,enum pin_config_param arg)1065 static int stm32_pconf_parse_conf(struct pinctrl_dev *pctldev,
1066 unsigned int pin, enum pin_config_param param,
1067 enum pin_config_param arg)
1068 {
1069 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
1070 struct pinctrl_gpio_range *range;
1071 struct stm32_gpio_bank *bank;
1072 int offset, ret = 0;
1073
1074 range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin);
1075 if (!range) {
1076 dev_err(pctl->dev, "No gpio range defined.\n");
1077 return -EINVAL;
1078 }
1079
1080 bank = gpiochip_get_data(range->gc);
1081 offset = stm32_gpio_pin(pin);
1082
1083 if (!gpiochip_line_is_valid(range->gc, offset)) {
1084 dev_warn(pctl->dev, "Can't access gpio %d\n", pin);
1085 return -EACCES;
1086 }
1087
1088 switch (param) {
1089 case PIN_CONFIG_DRIVE_PUSH_PULL:
1090 ret = stm32_pconf_set_driving(bank, offset, 0);
1091 break;
1092 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
1093 ret = stm32_pconf_set_driving(bank, offset, 1);
1094 break;
1095 case PIN_CONFIG_SLEW_RATE:
1096 ret = stm32_pconf_set_speed(bank, offset, arg);
1097 break;
1098 case PIN_CONFIG_BIAS_DISABLE:
1099 ret = stm32_pconf_set_bias(bank, offset, 0);
1100 break;
1101 case PIN_CONFIG_BIAS_PULL_UP:
1102 ret = stm32_pconf_set_bias(bank, offset, 1);
1103 break;
1104 case PIN_CONFIG_BIAS_PULL_DOWN:
1105 ret = stm32_pconf_set_bias(bank, offset, 2);
1106 break;
1107 case PIN_CONFIG_OUTPUT:
1108 __stm32_gpio_set(bank, offset, arg);
1109 ret = stm32_pmx_gpio_set_direction(pctldev, range, pin, false);
1110 break;
1111 default:
1112 ret = -ENOTSUPP;
1113 }
1114
1115 return ret;
1116 }
1117
stm32_pconf_group_get(struct pinctrl_dev * pctldev,unsigned group,unsigned long * config)1118 static int stm32_pconf_group_get(struct pinctrl_dev *pctldev,
1119 unsigned group,
1120 unsigned long *config)
1121 {
1122 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
1123
1124 *config = pctl->groups[group].config;
1125
1126 return 0;
1127 }
1128
stm32_pconf_group_set(struct pinctrl_dev * pctldev,unsigned group,unsigned long * configs,unsigned num_configs)1129 static int stm32_pconf_group_set(struct pinctrl_dev *pctldev, unsigned group,
1130 unsigned long *configs, unsigned num_configs)
1131 {
1132 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
1133 struct stm32_pinctrl_group *g = &pctl->groups[group];
1134 int i, ret;
1135
1136 for (i = 0; i < num_configs; i++) {
1137 mutex_lock(&pctldev->mutex);
1138 ret = stm32_pconf_parse_conf(pctldev, g->pin,
1139 pinconf_to_config_param(configs[i]),
1140 pinconf_to_config_argument(configs[i]));
1141 mutex_unlock(&pctldev->mutex);
1142 if (ret < 0)
1143 return ret;
1144
1145 g->config = configs[i];
1146 }
1147
1148 return 0;
1149 }
1150
stm32_pconf_set(struct pinctrl_dev * pctldev,unsigned int pin,unsigned long * configs,unsigned int num_configs)1151 static int stm32_pconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
1152 unsigned long *configs, unsigned int num_configs)
1153 {
1154 int i, ret;
1155
1156 for (i = 0; i < num_configs; i++) {
1157 ret = stm32_pconf_parse_conf(pctldev, pin,
1158 pinconf_to_config_param(configs[i]),
1159 pinconf_to_config_argument(configs[i]));
1160 if (ret < 0)
1161 return ret;
1162 }
1163
1164 return 0;
1165 }
1166
1167 static struct stm32_desc_pin *
stm32_pconf_get_pin_desc_by_pin_number(struct stm32_pinctrl * pctl,unsigned int pin_number)1168 stm32_pconf_get_pin_desc_by_pin_number(struct stm32_pinctrl *pctl,
1169 unsigned int pin_number)
1170 {
1171 struct stm32_desc_pin *pins = pctl->pins;
1172 int i;
1173
1174 for (i = 0; i < pctl->npins; i++) {
1175 if (pins->pin.number == pin_number)
1176 return pins;
1177 pins++;
1178 }
1179 return NULL;
1180 }
1181
stm32_pconf_dbg_show(struct pinctrl_dev * pctldev,struct seq_file * s,unsigned int pin)1182 static void stm32_pconf_dbg_show(struct pinctrl_dev *pctldev,
1183 struct seq_file *s,
1184 unsigned int pin)
1185 {
1186 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
1187 const struct stm32_desc_pin *pin_desc;
1188 struct pinctrl_gpio_range *range;
1189 struct stm32_gpio_bank *bank;
1190 int offset;
1191 u32 mode, alt, drive, speed, bias;
1192 static const char * const modes[] = {
1193 "input", "output", "alternate", "analog" };
1194 static const char * const speeds[] = {
1195 "low", "medium", "high", "very high" };
1196 static const char * const biasing[] = {
1197 "floating", "pull up", "pull down", "" };
1198 bool val;
1199
1200 range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin);
1201 if (!range)
1202 return;
1203
1204 bank = gpiochip_get_data(range->gc);
1205 offset = stm32_gpio_pin(pin);
1206
1207 if (!gpiochip_line_is_valid(range->gc, offset)) {
1208 seq_puts(s, "NO ACCESS");
1209 return;
1210 }
1211
1212 stm32_pmx_get_mode(bank, offset, &mode, &alt);
1213 bias = stm32_pconf_get_bias(bank, offset);
1214
1215 seq_printf(s, "%s ", modes[mode]);
1216
1217 switch (mode) {
1218 /* input */
1219 case 0:
1220 val = stm32_pconf_get(bank, offset, true);
1221 seq_printf(s, "- %s - %s",
1222 val ? "high" : "low",
1223 biasing[bias]);
1224 break;
1225
1226 /* output */
1227 case 1:
1228 drive = stm32_pconf_get_driving(bank, offset);
1229 speed = stm32_pconf_get_speed(bank, offset);
1230 val = stm32_pconf_get(bank, offset, false);
1231 seq_printf(s, "- %s - %s - %s - %s %s",
1232 val ? "high" : "low",
1233 drive ? "open drain" : "push pull",
1234 biasing[bias],
1235 speeds[speed], "speed");
1236 break;
1237
1238 /* alternate */
1239 case 2:
1240 drive = stm32_pconf_get_driving(bank, offset);
1241 speed = stm32_pconf_get_speed(bank, offset);
1242 pin_desc = stm32_pconf_get_pin_desc_by_pin_number(pctl, pin);
1243 if (!pin_desc)
1244 return;
1245
1246 seq_printf(s, "%d (%s) - %s - %s - %s %s", alt,
1247 pin_desc->functions[alt + 1].name,
1248 drive ? "open drain" : "push pull",
1249 biasing[bias],
1250 speeds[speed], "speed");
1251 break;
1252
1253 /* analog */
1254 case 3:
1255 break;
1256 }
1257 }
1258
1259 static const struct pinconf_ops stm32_pconf_ops = {
1260 .pin_config_group_get = stm32_pconf_group_get,
1261 .pin_config_group_set = stm32_pconf_group_set,
1262 .pin_config_set = stm32_pconf_set,
1263 .pin_config_dbg_show = stm32_pconf_dbg_show,
1264 };
1265
stm32_pctrl_get_desc_pin_from_gpio(struct stm32_pinctrl * pctl,struct stm32_gpio_bank * bank,unsigned int offset)1266 static struct stm32_desc_pin *stm32_pctrl_get_desc_pin_from_gpio(struct stm32_pinctrl *pctl,
1267 struct stm32_gpio_bank *bank,
1268 unsigned int offset)
1269 {
1270 unsigned int stm32_pin_nb = bank->bank_nr * STM32_GPIO_PINS_PER_BANK + offset;
1271 struct stm32_desc_pin *pin_desc;
1272 int i;
1273
1274 /* With few exceptions (e.g. bank 'Z'), pin number matches with pin index in array */
1275 if (stm32_pin_nb < pctl->npins) {
1276 pin_desc = pctl->pins + stm32_pin_nb;
1277 if (pin_desc->pin.number == stm32_pin_nb)
1278 return pin_desc;
1279 }
1280
1281 /* Otherwise, loop all array to find the pin with the right number */
1282 for (i = 0; i < pctl->npins; i++) {
1283 pin_desc = pctl->pins + i;
1284 if (pin_desc->pin.number == stm32_pin_nb)
1285 return pin_desc;
1286 }
1287 return NULL;
1288 }
1289
stm32_gpiolib_register_bank(struct stm32_pinctrl * pctl,struct fwnode_handle * fwnode)1290 static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl, struct fwnode_handle *fwnode)
1291 {
1292 struct stm32_gpio_bank *bank = &pctl->banks[pctl->nbanks];
1293 int bank_ioport_nr;
1294 struct pinctrl_gpio_range *range = &bank->range;
1295 struct fwnode_reference_args args;
1296 struct device *dev = pctl->dev;
1297 struct resource res;
1298 int npins = STM32_GPIO_PINS_PER_BANK;
1299 int bank_nr, err, i = 0;
1300 struct stm32_desc_pin *stm32_pin;
1301 char **names;
1302
1303 if (!IS_ERR(bank->rstc))
1304 reset_control_deassert(bank->rstc);
1305
1306 if (of_address_to_resource(to_of_node(fwnode), 0, &res))
1307 return -ENODEV;
1308
1309 bank->base = devm_ioremap_resource(dev, &res);
1310 if (IS_ERR(bank->base))
1311 return PTR_ERR(bank->base);
1312
1313 err = clk_prepare_enable(bank->clk);
1314 if (err) {
1315 dev_err(dev, "failed to prepare_enable clk (%d)\n", err);
1316 return err;
1317 }
1318
1319 bank->gpio_chip = stm32_gpio_template;
1320
1321 fwnode_property_read_string(fwnode, "st,bank-name", &bank->gpio_chip.label);
1322
1323 if (!fwnode_property_get_reference_args(fwnode, "gpio-ranges", NULL, 3, i, &args)) {
1324 bank_nr = args.args[1] / STM32_GPIO_PINS_PER_BANK;
1325 bank->gpio_chip.base = args.args[1];
1326
1327 /* get the last defined gpio line (offset + nb of pins) */
1328 npins = args.args[0] + args.args[2];
1329 while (!fwnode_property_get_reference_args(fwnode, "gpio-ranges", NULL, 3, ++i, &args))
1330 npins = max(npins, (int)(args.args[0] + args.args[2]));
1331 } else {
1332 bank_nr = pctl->nbanks;
1333 bank->gpio_chip.base = bank_nr * STM32_GPIO_PINS_PER_BANK;
1334 range->name = bank->gpio_chip.label;
1335 range->id = bank_nr;
1336 range->pin_base = range->id * STM32_GPIO_PINS_PER_BANK;
1337 range->base = range->id * STM32_GPIO_PINS_PER_BANK;
1338 range->npins = npins;
1339 range->gc = &bank->gpio_chip;
1340 pinctrl_add_gpio_range(pctl->pctl_dev,
1341 &pctl->banks[bank_nr].range);
1342 }
1343
1344 if (fwnode_property_read_u32(fwnode, "st,bank-ioport", &bank_ioport_nr))
1345 bank_ioport_nr = bank_nr;
1346
1347 bank->gpio_chip.base = -1;
1348
1349 bank->gpio_chip.ngpio = npins;
1350 bank->gpio_chip.fwnode = fwnode;
1351 bank->gpio_chip.parent = dev;
1352 bank->bank_nr = bank_nr;
1353 bank->bank_ioport_nr = bank_ioport_nr;
1354 bank->secure_control = pctl->match_data->secure_control;
1355 spin_lock_init(&bank->lock);
1356
1357 if (pctl->domain) {
1358 /* create irq hierarchical domain */
1359 bank->fwnode = fwnode;
1360
1361 bank->domain = irq_domain_create_hierarchy(pctl->domain, 0, STM32_GPIO_IRQ_LINE,
1362 bank->fwnode, &stm32_gpio_domain_ops,
1363 bank);
1364
1365 if (!bank->domain) {
1366 err = -ENODEV;
1367 goto err_clk;
1368 }
1369 }
1370
1371 names = devm_kcalloc(dev, npins, sizeof(char *), GFP_KERNEL);
1372 if (!names) {
1373 err = -ENOMEM;
1374 goto err_clk;
1375 }
1376
1377 for (i = 0; i < npins; i++) {
1378 stm32_pin = stm32_pctrl_get_desc_pin_from_gpio(pctl, bank, i);
1379 if (stm32_pin && stm32_pin->pin.name)
1380 names[i] = devm_kasprintf(dev, GFP_KERNEL, "%s", stm32_pin->pin.name);
1381 else
1382 names[i] = NULL;
1383 }
1384
1385 bank->gpio_chip.names = (const char * const *)names;
1386
1387 err = gpiochip_add_data(&bank->gpio_chip, bank);
1388 if (err) {
1389 dev_err(dev, "Failed to add gpiochip(%d)!\n", bank_nr);
1390 goto err_clk;
1391 }
1392
1393 dev_info(dev, "%s bank added\n", bank->gpio_chip.label);
1394 return 0;
1395
1396 err_clk:
1397 clk_disable_unprepare(bank->clk);
1398 return err;
1399 }
1400
stm32_pctrl_get_irq_domain(struct platform_device * pdev)1401 static struct irq_domain *stm32_pctrl_get_irq_domain(struct platform_device *pdev)
1402 {
1403 struct device_node *np = pdev->dev.of_node;
1404 struct device_node *parent;
1405 struct irq_domain *domain;
1406
1407 if (!of_property_present(np, "interrupt-parent"))
1408 return NULL;
1409
1410 parent = of_irq_find_parent(np);
1411 if (!parent)
1412 return ERR_PTR(-ENXIO);
1413
1414 domain = irq_find_host(parent);
1415 of_node_put(parent);
1416 if (!domain)
1417 /* domain not registered yet */
1418 return ERR_PTR(-EPROBE_DEFER);
1419
1420 return domain;
1421 }
1422
stm32_pctrl_dt_setup_irq(struct platform_device * pdev,struct stm32_pinctrl * pctl)1423 static int stm32_pctrl_dt_setup_irq(struct platform_device *pdev,
1424 struct stm32_pinctrl *pctl)
1425 {
1426 struct device_node *np = pdev->dev.of_node;
1427 struct device *dev = &pdev->dev;
1428 struct regmap *rm;
1429 int offset, ret, i;
1430 int mask, mask_width;
1431
1432 pctl->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
1433 if (IS_ERR(pctl->regmap))
1434 return PTR_ERR(pctl->regmap);
1435
1436 rm = pctl->regmap;
1437
1438 ret = of_property_read_u32_index(np, "st,syscfg", 1, &offset);
1439 if (ret)
1440 return ret;
1441
1442 ret = of_property_read_u32_index(np, "st,syscfg", 2, &mask);
1443 if (ret)
1444 mask = SYSCFG_IRQMUX_MASK;
1445
1446 mask_width = fls(mask);
1447
1448 for (i = 0; i < STM32_GPIO_PINS_PER_BANK; i++) {
1449 struct reg_field mux;
1450
1451 mux.reg = offset + (i / 4) * 4;
1452 mux.lsb = (i % 4) * mask_width;
1453 mux.msb = mux.lsb + mask_width - 1;
1454
1455 dev_dbg(dev, "irqmux%d: reg:%#x, lsb:%d, msb:%d\n",
1456 i, mux.reg, mux.lsb, mux.msb);
1457
1458 pctl->irqmux[i] = devm_regmap_field_alloc(dev, rm, mux);
1459 if (IS_ERR(pctl->irqmux[i]))
1460 return PTR_ERR(pctl->irqmux[i]);
1461 }
1462
1463 return 0;
1464 }
1465
stm32_pctrl_build_state(struct platform_device * pdev)1466 static int stm32_pctrl_build_state(struct platform_device *pdev)
1467 {
1468 struct stm32_pinctrl *pctl = platform_get_drvdata(pdev);
1469 int i;
1470
1471 pctl->ngroups = pctl->npins;
1472
1473 /* Allocate groups */
1474 pctl->groups = devm_kcalloc(&pdev->dev, pctl->ngroups,
1475 sizeof(*pctl->groups), GFP_KERNEL);
1476 if (!pctl->groups)
1477 return -ENOMEM;
1478
1479 /* We assume that one pin is one group, use pin name as group name. */
1480 pctl->grp_names = devm_kcalloc(&pdev->dev, pctl->ngroups,
1481 sizeof(*pctl->grp_names), GFP_KERNEL);
1482 if (!pctl->grp_names)
1483 return -ENOMEM;
1484
1485 for (i = 0; i < pctl->npins; i++) {
1486 const struct stm32_desc_pin *pin = pctl->pins + i;
1487 struct stm32_pinctrl_group *group = pctl->groups + i;
1488
1489 group->name = pin->pin.name;
1490 group->pin = pin->pin.number;
1491 pctl->grp_names[i] = pin->pin.name;
1492 }
1493
1494 return 0;
1495 }
1496
stm32_pctrl_create_pins_tab(struct stm32_pinctrl * pctl,struct stm32_desc_pin * pins)1497 static int stm32_pctrl_create_pins_tab(struct stm32_pinctrl *pctl,
1498 struct stm32_desc_pin *pins)
1499 {
1500 const struct stm32_desc_pin *p;
1501 int i, nb_pins_available = 0;
1502
1503 for (i = 0; i < pctl->match_data->npins; i++) {
1504 p = pctl->match_data->pins + i;
1505 if (pctl->pkg && !(pctl->pkg & p->pkg))
1506 continue;
1507 pins->pin = p->pin;
1508 memcpy((struct stm32_desc_pin *)pins->functions, p->functions,
1509 STM32_CONFIG_NUM * sizeof(struct stm32_desc_function));
1510 pins++;
1511 nb_pins_available++;
1512 }
1513
1514 pctl->npins = nb_pins_available;
1515
1516 return 0;
1517 }
1518
stm32_pctl_probe(struct platform_device * pdev)1519 int stm32_pctl_probe(struct platform_device *pdev)
1520 {
1521 const struct stm32_pinctrl_match_data *match_data;
1522 struct fwnode_handle *child;
1523 struct device *dev = &pdev->dev;
1524 struct stm32_pinctrl *pctl;
1525 struct pinctrl_pin_desc *pins;
1526 int i, ret, hwlock_id;
1527 unsigned int banks;
1528
1529 match_data = device_get_match_data(dev);
1530 if (!match_data)
1531 return -EINVAL;
1532
1533 pctl = devm_kzalloc(dev, sizeof(*pctl), GFP_KERNEL);
1534 if (!pctl)
1535 return -ENOMEM;
1536
1537 platform_set_drvdata(pdev, pctl);
1538
1539 /* check for IRQ controller (may require deferred probe) */
1540 pctl->domain = stm32_pctrl_get_irq_domain(pdev);
1541 if (IS_ERR(pctl->domain))
1542 return PTR_ERR(pctl->domain);
1543 if (!pctl->domain)
1544 dev_warn(dev, "pinctrl without interrupt support\n");
1545
1546 /* hwspinlock is optional */
1547 hwlock_id = of_hwspin_lock_get_id(pdev->dev.of_node, 0);
1548 if (hwlock_id < 0) {
1549 if (hwlock_id == -EPROBE_DEFER)
1550 return hwlock_id;
1551 } else {
1552 pctl->hwlock = hwspin_lock_request_specific(hwlock_id);
1553 }
1554
1555 spin_lock_init(&pctl->irqmux_lock);
1556
1557 pctl->dev = dev;
1558 pctl->match_data = match_data;
1559
1560 /* get optional package information */
1561 if (!device_property_read_u32(dev, "st,package", &pctl->pkg))
1562 dev_dbg(pctl->dev, "package detected: %x\n", pctl->pkg);
1563
1564 pctl->pins = devm_kcalloc(pctl->dev, pctl->match_data->npins,
1565 sizeof(*pctl->pins), GFP_KERNEL);
1566 if (!pctl->pins)
1567 return -ENOMEM;
1568
1569 ret = stm32_pctrl_create_pins_tab(pctl, pctl->pins);
1570 if (ret)
1571 return ret;
1572
1573 ret = stm32_pctrl_build_state(pdev);
1574 if (ret) {
1575 dev_err(dev, "build state failed: %d\n", ret);
1576 return -EINVAL;
1577 }
1578
1579 if (pctl->domain) {
1580 ret = stm32_pctrl_dt_setup_irq(pdev, pctl);
1581 if (ret)
1582 return ret;
1583 }
1584
1585 pins = devm_kcalloc(&pdev->dev, pctl->npins, sizeof(*pins),
1586 GFP_KERNEL);
1587 if (!pins)
1588 return -ENOMEM;
1589
1590 for (i = 0; i < pctl->npins; i++)
1591 pins[i] = pctl->pins[i].pin;
1592
1593 pctl->pctl_desc.name = dev_name(&pdev->dev);
1594 pctl->pctl_desc.owner = THIS_MODULE;
1595 pctl->pctl_desc.pins = pins;
1596 pctl->pctl_desc.npins = pctl->npins;
1597 pctl->pctl_desc.link_consumers = true;
1598 pctl->pctl_desc.confops = &stm32_pconf_ops;
1599 pctl->pctl_desc.pctlops = &stm32_pctrl_ops;
1600 pctl->pctl_desc.pmxops = &stm32_pmx_ops;
1601 pctl->dev = &pdev->dev;
1602
1603 pctl->pctl_dev = devm_pinctrl_register(&pdev->dev, &pctl->pctl_desc,
1604 pctl);
1605
1606 if (IS_ERR(pctl->pctl_dev)) {
1607 dev_err(&pdev->dev, "Failed pinctrl registration\n");
1608 return PTR_ERR(pctl->pctl_dev);
1609 }
1610
1611 banks = gpiochip_node_count(dev);
1612 if (!banks) {
1613 dev_err(dev, "at least one GPIO bank is required\n");
1614 return -EINVAL;
1615 }
1616 pctl->banks = devm_kcalloc(dev, banks, sizeof(*pctl->banks),
1617 GFP_KERNEL);
1618 if (!pctl->banks)
1619 return -ENOMEM;
1620
1621 i = 0;
1622 for_each_gpiochip_node(dev, child) {
1623 struct stm32_gpio_bank *bank = &pctl->banks[i];
1624 struct device_node *np = to_of_node(child);
1625
1626 bank->rstc = of_reset_control_get_exclusive(np, NULL);
1627 if (PTR_ERR(bank->rstc) == -EPROBE_DEFER) {
1628 fwnode_handle_put(child);
1629 return -EPROBE_DEFER;
1630 }
1631
1632 bank->clk = of_clk_get_by_name(np, NULL);
1633 if (IS_ERR(bank->clk)) {
1634 fwnode_handle_put(child);
1635 return dev_err_probe(dev, PTR_ERR(bank->clk),
1636 "failed to get clk\n");
1637 }
1638 i++;
1639 }
1640
1641 for_each_gpiochip_node(dev, child) {
1642 ret = stm32_gpiolib_register_bank(pctl, child);
1643 if (ret) {
1644 fwnode_handle_put(child);
1645
1646 for (i = 0; i < pctl->nbanks; i++)
1647 clk_disable_unprepare(pctl->banks[i].clk);
1648
1649 return ret;
1650 }
1651
1652 pctl->nbanks++;
1653 }
1654
1655 dev_info(dev, "Pinctrl STM32 initialized\n");
1656
1657 return 0;
1658 }
1659
stm32_pinctrl_restore_gpio_regs(struct stm32_pinctrl * pctl,u32 pin)1660 static int __maybe_unused stm32_pinctrl_restore_gpio_regs(
1661 struct stm32_pinctrl *pctl, u32 pin)
1662 {
1663 const struct pin_desc *desc = pin_desc_get(pctl->pctl_dev, pin);
1664 u32 val, alt, mode, offset = stm32_gpio_pin(pin);
1665 struct pinctrl_gpio_range *range;
1666 struct stm32_gpio_bank *bank;
1667 bool pin_is_irq;
1668 int ret;
1669
1670 range = pinctrl_find_gpio_range_from_pin(pctl->pctl_dev, pin);
1671 if (!range)
1672 return 0;
1673
1674 if (!gpiochip_line_is_valid(range->gc, offset))
1675 return 0;
1676
1677 pin_is_irq = gpiochip_line_is_irq(range->gc, offset);
1678
1679 if (!desc || (!pin_is_irq && !desc->gpio_owner))
1680 return 0;
1681
1682 bank = gpiochip_get_data(range->gc);
1683
1684 alt = bank->pin_backup[offset] & STM32_GPIO_BKP_ALT_MASK;
1685 alt >>= STM32_GPIO_BKP_ALT_SHIFT;
1686 mode = bank->pin_backup[offset] & STM32_GPIO_BKP_MODE_MASK;
1687 mode >>= STM32_GPIO_BKP_MODE_SHIFT;
1688
1689 ret = stm32_pmx_set_mode(bank, offset, mode, alt);
1690 if (ret)
1691 return ret;
1692
1693 if (mode == 1) {
1694 val = bank->pin_backup[offset] & BIT(STM32_GPIO_BKP_VAL);
1695 val = val >> STM32_GPIO_BKP_VAL;
1696 __stm32_gpio_set(bank, offset, val);
1697 }
1698
1699 val = bank->pin_backup[offset] & BIT(STM32_GPIO_BKP_TYPE);
1700 val >>= STM32_GPIO_BKP_TYPE;
1701 ret = stm32_pconf_set_driving(bank, offset, val);
1702 if (ret)
1703 return ret;
1704
1705 val = bank->pin_backup[offset] & STM32_GPIO_BKP_SPEED_MASK;
1706 val >>= STM32_GPIO_BKP_SPEED_SHIFT;
1707 ret = stm32_pconf_set_speed(bank, offset, val);
1708 if (ret)
1709 return ret;
1710
1711 val = bank->pin_backup[offset] & STM32_GPIO_BKP_PUPD_MASK;
1712 val >>= STM32_GPIO_BKP_PUPD_SHIFT;
1713 ret = stm32_pconf_set_bias(bank, offset, val);
1714 if (ret)
1715 return ret;
1716
1717 if (pin_is_irq)
1718 regmap_field_write(pctl->irqmux[offset], bank->bank_ioport_nr);
1719
1720 return 0;
1721 }
1722
stm32_pinctrl_suspend(struct device * dev)1723 int __maybe_unused stm32_pinctrl_suspend(struct device *dev)
1724 {
1725 struct stm32_pinctrl *pctl = dev_get_drvdata(dev);
1726 int i;
1727
1728 for (i = 0; i < pctl->nbanks; i++)
1729 clk_disable(pctl->banks[i].clk);
1730
1731 return 0;
1732 }
1733
stm32_pinctrl_resume(struct device * dev)1734 int __maybe_unused stm32_pinctrl_resume(struct device *dev)
1735 {
1736 struct stm32_pinctrl *pctl = dev_get_drvdata(dev);
1737 struct stm32_pinctrl_group *g = pctl->groups;
1738 int i;
1739
1740 for (i = 0; i < pctl->nbanks; i++)
1741 clk_enable(pctl->banks[i].clk);
1742
1743 for (i = 0; i < pctl->ngroups; i++, g++)
1744 stm32_pinctrl_restore_gpio_regs(pctl, g->pin);
1745
1746 return 0;
1747 }
1748