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_address.h> 17 #include <linux/of_device.h> 18 #include <linux/of.h> 19 #include <linux/of_irq.h> 20 #include <linux/platform_device.h> 21 #include <linux/property.h> 22 #include <linux/regmap.h> 23 #include <linux/reset.h> 24 #include <linux/seq_file.h> 25 #include <linux/slab.h> 26 27 #include <linux/pinctrl/consumer.h> 28 #include <linux/pinctrl/machine.h> 29 #include <linux/pinctrl/pinconf-generic.h> 30 #include <linux/pinctrl/pinconf.h> 31 #include <linux/pinctrl/pinctrl.h> 32 #include <linux/pinctrl/pinmux.h> 33 34 #include "../core.h" 35 #include "../pinconf.h" 36 #include "../pinctrl-utils.h" 37 #include "pinctrl-stm32.h" 38 39 #define STM32_GPIO_MODER 0x00 40 #define STM32_GPIO_TYPER 0x04 41 #define STM32_GPIO_SPEEDR 0x08 42 #define STM32_GPIO_PUPDR 0x0c 43 #define STM32_GPIO_IDR 0x10 44 #define STM32_GPIO_ODR 0x14 45 #define STM32_GPIO_BSRR 0x18 46 #define STM32_GPIO_LCKR 0x1c 47 #define STM32_GPIO_AFRL 0x20 48 #define STM32_GPIO_AFRH 0x24 49 #define STM32_GPIO_SECCFGR 0x30 50 51 /* custom bitfield to backup pin status */ 52 #define STM32_GPIO_BKP_MODE_SHIFT 0 53 #define STM32_GPIO_BKP_MODE_MASK GENMASK(1, 0) 54 #define STM32_GPIO_BKP_ALT_SHIFT 2 55 #define STM32_GPIO_BKP_ALT_MASK GENMASK(5, 2) 56 #define STM32_GPIO_BKP_SPEED_SHIFT 6 57 #define STM32_GPIO_BKP_SPEED_MASK GENMASK(7, 6) 58 #define STM32_GPIO_BKP_PUPD_SHIFT 8 59 #define STM32_GPIO_BKP_PUPD_MASK GENMASK(9, 8) 60 #define STM32_GPIO_BKP_TYPE 10 61 #define STM32_GPIO_BKP_VAL 11 62 63 #define STM32_GPIO_PINS_PER_BANK 16 64 #define STM32_GPIO_IRQ_LINE 16 65 66 #define SYSCFG_IRQMUX_MASK GENMASK(3, 0) 67 68 #define gpio_range_to_bank(chip) \ 69 container_of(chip, struct stm32_gpio_bank, range) 70 71 #define HWSPNLCK_TIMEOUT 1000 /* usec */ 72 73 static const char * const stm32_gpio_functions[] = { 74 "gpio", "af0", "af1", 75 "af2", "af3", "af4", 76 "af5", "af6", "af7", 77 "af8", "af9", "af10", 78 "af11", "af12", "af13", 79 "af14", "af15", "analog", 80 }; 81 82 struct stm32_pinctrl_group { 83 const char *name; 84 unsigned long config; 85 unsigned pin; 86 }; 87 88 struct stm32_gpio_bank { 89 void __iomem *base; 90 struct clk *clk; 91 struct reset_control *rstc; 92 spinlock_t lock; 93 struct gpio_chip gpio_chip; 94 struct pinctrl_gpio_range range; 95 struct fwnode_handle *fwnode; 96 struct irq_domain *domain; 97 u32 bank_nr; 98 u32 bank_ioport_nr; 99 u32 pin_backup[STM32_GPIO_PINS_PER_BANK]; 100 u8 irq_type[STM32_GPIO_PINS_PER_BANK]; 101 bool secure_control; 102 }; 103 104 struct stm32_pinctrl { 105 struct device *dev; 106 struct pinctrl_dev *pctl_dev; 107 struct pinctrl_desc pctl_desc; 108 struct stm32_pinctrl_group *groups; 109 unsigned ngroups; 110 const char **grp_names; 111 struct stm32_gpio_bank *banks; 112 unsigned nbanks; 113 const struct stm32_pinctrl_match_data *match_data; 114 struct irq_domain *domain; 115 struct regmap *regmap; 116 struct regmap_field *irqmux[STM32_GPIO_PINS_PER_BANK]; 117 struct hwspinlock *hwlock; 118 struct stm32_desc_pin *pins; 119 u32 npins; 120 u32 pkg; 121 u16 irqmux_map; 122 spinlock_t irqmux_lock; 123 }; 124 125 static inline int stm32_gpio_pin(int gpio) 126 { 127 return gpio % STM32_GPIO_PINS_PER_BANK; 128 } 129 130 static inline u32 stm32_gpio_get_mode(u32 function) 131 { 132 switch (function) { 133 case STM32_PIN_GPIO: 134 return 0; 135 case STM32_PIN_AF(0) ... STM32_PIN_AF(15): 136 return 2; 137 case STM32_PIN_ANALOG: 138 return 3; 139 } 140 141 return 0; 142 } 143 144 static inline u32 stm32_gpio_get_alt(u32 function) 145 { 146 switch (function) { 147 case STM32_PIN_GPIO: 148 return 0; 149 case STM32_PIN_AF(0) ... STM32_PIN_AF(15): 150 return function - 1; 151 case STM32_PIN_ANALOG: 152 return 0; 153 } 154 155 return 0; 156 } 157 158 static void stm32_gpio_backup_value(struct stm32_gpio_bank *bank, 159 u32 offset, u32 value) 160 { 161 bank->pin_backup[offset] &= ~BIT(STM32_GPIO_BKP_VAL); 162 bank->pin_backup[offset] |= value << STM32_GPIO_BKP_VAL; 163 } 164 165 static void stm32_gpio_backup_mode(struct stm32_gpio_bank *bank, u32 offset, 166 u32 mode, u32 alt) 167 { 168 bank->pin_backup[offset] &= ~(STM32_GPIO_BKP_MODE_MASK | 169 STM32_GPIO_BKP_ALT_MASK); 170 bank->pin_backup[offset] |= mode << STM32_GPIO_BKP_MODE_SHIFT; 171 bank->pin_backup[offset] |= alt << STM32_GPIO_BKP_ALT_SHIFT; 172 } 173 174 static void stm32_gpio_backup_driving(struct stm32_gpio_bank *bank, u32 offset, 175 u32 drive) 176 { 177 bank->pin_backup[offset] &= ~BIT(STM32_GPIO_BKP_TYPE); 178 bank->pin_backup[offset] |= drive << STM32_GPIO_BKP_TYPE; 179 } 180 181 static void stm32_gpio_backup_speed(struct stm32_gpio_bank *bank, u32 offset, 182 u32 speed) 183 { 184 bank->pin_backup[offset] &= ~STM32_GPIO_BKP_SPEED_MASK; 185 bank->pin_backup[offset] |= speed << STM32_GPIO_BKP_SPEED_SHIFT; 186 } 187 188 static void stm32_gpio_backup_bias(struct stm32_gpio_bank *bank, u32 offset, 189 u32 bias) 190 { 191 bank->pin_backup[offset] &= ~STM32_GPIO_BKP_PUPD_MASK; 192 bank->pin_backup[offset] |= bias << STM32_GPIO_BKP_PUPD_SHIFT; 193 } 194 195 /* GPIO functions */ 196 197 static inline void __stm32_gpio_set(struct stm32_gpio_bank *bank, 198 unsigned offset, int value) 199 { 200 stm32_gpio_backup_value(bank, offset, value); 201 202 if (!value) 203 offset += STM32_GPIO_PINS_PER_BANK; 204 205 writel_relaxed(BIT(offset), bank->base + STM32_GPIO_BSRR); 206 } 207 208 static int stm32_gpio_request(struct gpio_chip *chip, unsigned offset) 209 { 210 struct stm32_gpio_bank *bank = gpiochip_get_data(chip); 211 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); 212 struct pinctrl_gpio_range *range; 213 int pin = offset + (bank->bank_nr * STM32_GPIO_PINS_PER_BANK); 214 215 range = pinctrl_find_gpio_range_from_pin_nolock(pctl->pctl_dev, pin); 216 if (!range) { 217 dev_err(pctl->dev, "pin %d not in range.\n", pin); 218 return -EINVAL; 219 } 220 221 return pinctrl_gpio_request(chip->base + offset); 222 } 223 224 static void stm32_gpio_free(struct gpio_chip *chip, unsigned offset) 225 { 226 pinctrl_gpio_free(chip->base + offset); 227 } 228 229 static int stm32_gpio_get(struct gpio_chip *chip, unsigned offset) 230 { 231 struct stm32_gpio_bank *bank = gpiochip_get_data(chip); 232 233 return !!(readl_relaxed(bank->base + STM32_GPIO_IDR) & BIT(offset)); 234 } 235 236 static void stm32_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 237 { 238 struct stm32_gpio_bank *bank = gpiochip_get_data(chip); 239 240 __stm32_gpio_set(bank, offset, value); 241 } 242 243 static int stm32_gpio_direction_input(struct gpio_chip *chip, unsigned offset) 244 { 245 return pinctrl_gpio_direction_input(chip->base + offset); 246 } 247 248 static int stm32_gpio_direction_output(struct gpio_chip *chip, 249 unsigned offset, int value) 250 { 251 struct stm32_gpio_bank *bank = gpiochip_get_data(chip); 252 253 __stm32_gpio_set(bank, offset, value); 254 pinctrl_gpio_direction_output(chip->base + offset); 255 256 return 0; 257 } 258 259 260 static int stm32_gpio_to_irq(struct gpio_chip *chip, unsigned int offset) 261 { 262 struct stm32_gpio_bank *bank = gpiochip_get_data(chip); 263 struct irq_fwspec fwspec; 264 265 fwspec.fwnode = bank->fwnode; 266 fwspec.param_count = 2; 267 fwspec.param[0] = offset; 268 fwspec.param[1] = IRQ_TYPE_NONE; 269 270 return irq_create_fwspec_mapping(&fwspec); 271 } 272 273 static int stm32_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) 274 { 275 struct stm32_gpio_bank *bank = gpiochip_get_data(chip); 276 int pin = stm32_gpio_pin(offset); 277 int ret; 278 u32 mode, alt; 279 280 stm32_pmx_get_mode(bank, pin, &mode, &alt); 281 if ((alt == 0) && (mode == 0)) 282 ret = GPIO_LINE_DIRECTION_IN; 283 else if ((alt == 0) && (mode == 1)) 284 ret = GPIO_LINE_DIRECTION_OUT; 285 else 286 ret = -EINVAL; 287 288 return ret; 289 } 290 291 static int stm32_gpio_init_valid_mask(struct gpio_chip *chip, 292 unsigned long *valid_mask, 293 unsigned int ngpios) 294 { 295 struct stm32_gpio_bank *bank = gpiochip_get_data(chip); 296 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); 297 unsigned int i; 298 u32 sec; 299 300 /* All gpio are valid per default */ 301 bitmap_fill(valid_mask, ngpios); 302 303 if (bank->secure_control) { 304 /* Tag secured pins as invalid */ 305 sec = readl_relaxed(bank->base + STM32_GPIO_SECCFGR); 306 307 for (i = 0; i < ngpios; i++) { 308 if (sec & BIT(i)) { 309 clear_bit(i, valid_mask); 310 dev_dbg(pctl->dev, "No access to gpio %d - %d\n", bank->bank_nr, i); 311 } 312 } 313 } 314 315 return 0; 316 } 317 318 static const struct gpio_chip stm32_gpio_template = { 319 .request = stm32_gpio_request, 320 .free = stm32_gpio_free, 321 .get = stm32_gpio_get, 322 .set = stm32_gpio_set, 323 .direction_input = stm32_gpio_direction_input, 324 .direction_output = stm32_gpio_direction_output, 325 .to_irq = stm32_gpio_to_irq, 326 .get_direction = stm32_gpio_get_direction, 327 .set_config = gpiochip_generic_config, 328 .init_valid_mask = stm32_gpio_init_valid_mask, 329 }; 330 331 static void stm32_gpio_irq_trigger(struct irq_data *d) 332 { 333 struct stm32_gpio_bank *bank = d->domain->host_data; 334 int level; 335 336 /* Do not access the GPIO if this is not LEVEL triggered IRQ. */ 337 if (!(bank->irq_type[d->hwirq] & IRQ_TYPE_LEVEL_MASK)) 338 return; 339 340 /* If level interrupt type then retrig */ 341 level = stm32_gpio_get(&bank->gpio_chip, d->hwirq); 342 if ((level == 0 && bank->irq_type[d->hwirq] == IRQ_TYPE_LEVEL_LOW) || 343 (level == 1 && bank->irq_type[d->hwirq] == IRQ_TYPE_LEVEL_HIGH)) 344 irq_chip_retrigger_hierarchy(d); 345 } 346 347 static void stm32_gpio_irq_eoi(struct irq_data *d) 348 { 349 irq_chip_eoi_parent(d); 350 stm32_gpio_irq_trigger(d); 351 }; 352 353 static int stm32_gpio_set_type(struct irq_data *d, unsigned int type) 354 { 355 struct stm32_gpio_bank *bank = d->domain->host_data; 356 u32 parent_type; 357 358 switch (type) { 359 case IRQ_TYPE_EDGE_RISING: 360 case IRQ_TYPE_EDGE_FALLING: 361 case IRQ_TYPE_EDGE_BOTH: 362 parent_type = type; 363 break; 364 case IRQ_TYPE_LEVEL_HIGH: 365 parent_type = IRQ_TYPE_EDGE_RISING; 366 break; 367 case IRQ_TYPE_LEVEL_LOW: 368 parent_type = IRQ_TYPE_EDGE_FALLING; 369 break; 370 default: 371 return -EINVAL; 372 } 373 374 bank->irq_type[d->hwirq] = type; 375 376 return irq_chip_set_type_parent(d, parent_type); 377 }; 378 379 static int stm32_gpio_irq_request_resources(struct irq_data *irq_data) 380 { 381 struct stm32_gpio_bank *bank = irq_data->domain->host_data; 382 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); 383 int ret; 384 385 ret = stm32_gpio_direction_input(&bank->gpio_chip, irq_data->hwirq); 386 if (ret) 387 return ret; 388 389 ret = gpiochip_lock_as_irq(&bank->gpio_chip, irq_data->hwirq); 390 if (ret) { 391 dev_err(pctl->dev, "unable to lock HW IRQ %lu for IRQ\n", 392 irq_data->hwirq); 393 return ret; 394 } 395 396 return 0; 397 } 398 399 static void stm32_gpio_irq_release_resources(struct irq_data *irq_data) 400 { 401 struct stm32_gpio_bank *bank = irq_data->domain->host_data; 402 403 gpiochip_unlock_as_irq(&bank->gpio_chip, irq_data->hwirq); 404 } 405 406 static void stm32_gpio_irq_unmask(struct irq_data *d) 407 { 408 irq_chip_unmask_parent(d); 409 stm32_gpio_irq_trigger(d); 410 } 411 412 static struct irq_chip stm32_gpio_irq_chip = { 413 .name = "stm32gpio", 414 .irq_eoi = stm32_gpio_irq_eoi, 415 .irq_ack = irq_chip_ack_parent, 416 .irq_mask = irq_chip_mask_parent, 417 .irq_unmask = stm32_gpio_irq_unmask, 418 .irq_set_type = stm32_gpio_set_type, 419 .irq_set_wake = irq_chip_set_wake_parent, 420 .irq_request_resources = stm32_gpio_irq_request_resources, 421 .irq_release_resources = stm32_gpio_irq_release_resources, 422 }; 423 424 static int stm32_gpio_domain_translate(struct irq_domain *d, 425 struct irq_fwspec *fwspec, 426 unsigned long *hwirq, 427 unsigned int *type) 428 { 429 if ((fwspec->param_count != 2) || 430 (fwspec->param[0] >= STM32_GPIO_IRQ_LINE)) 431 return -EINVAL; 432 433 *hwirq = fwspec->param[0]; 434 *type = fwspec->param[1]; 435 return 0; 436 } 437 438 static int stm32_gpio_domain_activate(struct irq_domain *d, 439 struct irq_data *irq_data, bool reserve) 440 { 441 struct stm32_gpio_bank *bank = d->host_data; 442 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); 443 int ret = 0; 444 445 if (pctl->hwlock) { 446 ret = hwspin_lock_timeout_in_atomic(pctl->hwlock, 447 HWSPNLCK_TIMEOUT); 448 if (ret) { 449 dev_err(pctl->dev, "Can't get hwspinlock\n"); 450 return ret; 451 } 452 } 453 454 regmap_field_write(pctl->irqmux[irq_data->hwirq], bank->bank_ioport_nr); 455 456 if (pctl->hwlock) 457 hwspin_unlock_in_atomic(pctl->hwlock); 458 459 return ret; 460 } 461 462 static int stm32_gpio_domain_alloc(struct irq_domain *d, 463 unsigned int virq, 464 unsigned int nr_irqs, void *data) 465 { 466 struct stm32_gpio_bank *bank = d->host_data; 467 struct irq_fwspec *fwspec = data; 468 struct irq_fwspec parent_fwspec; 469 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); 470 irq_hw_number_t hwirq = fwspec->param[0]; 471 unsigned long flags; 472 int ret = 0; 473 474 /* 475 * Check first that the IRQ MUX of that line is free. 476 * gpio irq mux is shared between several banks, protect with a lock 477 */ 478 spin_lock_irqsave(&pctl->irqmux_lock, flags); 479 480 if (pctl->irqmux_map & BIT(hwirq)) { 481 dev_err(pctl->dev, "irq line %ld already requested.\n", hwirq); 482 ret = -EBUSY; 483 } else { 484 pctl->irqmux_map |= BIT(hwirq); 485 } 486 487 spin_unlock_irqrestore(&pctl->irqmux_lock, flags); 488 if (ret) 489 return ret; 490 491 parent_fwspec.fwnode = d->parent->fwnode; 492 parent_fwspec.param_count = 2; 493 parent_fwspec.param[0] = fwspec->param[0]; 494 parent_fwspec.param[1] = fwspec->param[1]; 495 496 irq_domain_set_hwirq_and_chip(d, virq, hwirq, &stm32_gpio_irq_chip, 497 bank); 498 499 return irq_domain_alloc_irqs_parent(d, virq, nr_irqs, &parent_fwspec); 500 } 501 502 static void stm32_gpio_domain_free(struct irq_domain *d, unsigned int virq, 503 unsigned int nr_irqs) 504 { 505 struct stm32_gpio_bank *bank = d->host_data; 506 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); 507 struct irq_data *irq_data = irq_domain_get_irq_data(d, virq); 508 unsigned long flags, hwirq = irq_data->hwirq; 509 510 irq_domain_free_irqs_common(d, virq, nr_irqs); 511 512 spin_lock_irqsave(&pctl->irqmux_lock, flags); 513 pctl->irqmux_map &= ~BIT(hwirq); 514 spin_unlock_irqrestore(&pctl->irqmux_lock, flags); 515 } 516 517 static const struct irq_domain_ops stm32_gpio_domain_ops = { 518 .translate = stm32_gpio_domain_translate, 519 .alloc = stm32_gpio_domain_alloc, 520 .free = stm32_gpio_domain_free, 521 .activate = stm32_gpio_domain_activate, 522 }; 523 524 /* Pinctrl functions */ 525 static struct stm32_pinctrl_group * 526 stm32_pctrl_find_group_by_pin(struct stm32_pinctrl *pctl, u32 pin) 527 { 528 int i; 529 530 for (i = 0; i < pctl->ngroups; i++) { 531 struct stm32_pinctrl_group *grp = pctl->groups + i; 532 533 if (grp->pin == pin) 534 return grp; 535 } 536 537 return NULL; 538 } 539 540 static bool stm32_pctrl_is_function_valid(struct stm32_pinctrl *pctl, 541 u32 pin_num, u32 fnum) 542 { 543 int i, k; 544 545 for (i = 0; i < pctl->npins; i++) { 546 const struct stm32_desc_pin *pin = pctl->pins + i; 547 const struct stm32_desc_function *func = pin->functions; 548 549 if (pin->pin.number != pin_num) 550 continue; 551 552 for (k = 0; k < STM32_CONFIG_NUM; k++) { 553 if (func->num == fnum) 554 return true; 555 func++; 556 } 557 558 break; 559 } 560 561 dev_err(pctl->dev, "invalid function %d on pin %d .\n", fnum, pin_num); 562 563 return false; 564 } 565 566 static int stm32_pctrl_dt_node_to_map_func(struct stm32_pinctrl *pctl, 567 u32 pin, u32 fnum, struct stm32_pinctrl_group *grp, 568 struct pinctrl_map **map, unsigned *reserved_maps, 569 unsigned *num_maps) 570 { 571 if (*num_maps == *reserved_maps) 572 return -ENOSPC; 573 574 (*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP; 575 (*map)[*num_maps].data.mux.group = grp->name; 576 577 if (!stm32_pctrl_is_function_valid(pctl, pin, fnum)) 578 return -EINVAL; 579 580 (*map)[*num_maps].data.mux.function = stm32_gpio_functions[fnum]; 581 (*num_maps)++; 582 583 return 0; 584 } 585 586 static int stm32_pctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev, 587 struct device_node *node, 588 struct pinctrl_map **map, 589 unsigned *reserved_maps, 590 unsigned *num_maps) 591 { 592 struct stm32_pinctrl *pctl; 593 struct stm32_pinctrl_group *grp; 594 struct property *pins; 595 u32 pinfunc, pin, func; 596 unsigned long *configs; 597 unsigned int num_configs; 598 bool has_config = 0; 599 unsigned reserve = 0; 600 int num_pins, num_funcs, maps_per_pin, i, err = 0; 601 602 pctl = pinctrl_dev_get_drvdata(pctldev); 603 604 pins = of_find_property(node, "pinmux", NULL); 605 if (!pins) { 606 dev_err(pctl->dev, "missing pins property in node %pOFn .\n", 607 node); 608 return -EINVAL; 609 } 610 611 err = pinconf_generic_parse_dt_config(node, pctldev, &configs, 612 &num_configs); 613 if (err) 614 return err; 615 616 if (num_configs) 617 has_config = 1; 618 619 num_pins = pins->length / sizeof(u32); 620 num_funcs = num_pins; 621 maps_per_pin = 0; 622 if (num_funcs) 623 maps_per_pin++; 624 if (has_config && num_pins >= 1) 625 maps_per_pin++; 626 627 if (!num_pins || !maps_per_pin) { 628 err = -EINVAL; 629 goto exit; 630 } 631 632 reserve = num_pins * maps_per_pin; 633 634 err = pinctrl_utils_reserve_map(pctldev, map, 635 reserved_maps, num_maps, reserve); 636 if (err) 637 goto exit; 638 639 for (i = 0; i < num_pins; i++) { 640 err = of_property_read_u32_index(node, "pinmux", 641 i, &pinfunc); 642 if (err) 643 goto exit; 644 645 pin = STM32_GET_PIN_NO(pinfunc); 646 func = STM32_GET_PIN_FUNC(pinfunc); 647 648 if (!stm32_pctrl_is_function_valid(pctl, pin, func)) { 649 err = -EINVAL; 650 goto exit; 651 } 652 653 grp = stm32_pctrl_find_group_by_pin(pctl, pin); 654 if (!grp) { 655 dev_err(pctl->dev, "unable to match pin %d to group\n", 656 pin); 657 err = -EINVAL; 658 goto exit; 659 } 660 661 err = stm32_pctrl_dt_node_to_map_func(pctl, pin, func, grp, map, 662 reserved_maps, num_maps); 663 if (err) 664 goto exit; 665 666 if (has_config) { 667 err = pinctrl_utils_add_map_configs(pctldev, map, 668 reserved_maps, num_maps, grp->name, 669 configs, num_configs, 670 PIN_MAP_TYPE_CONFIGS_GROUP); 671 if (err) 672 goto exit; 673 } 674 } 675 676 exit: 677 kfree(configs); 678 return err; 679 } 680 681 static int stm32_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev, 682 struct device_node *np_config, 683 struct pinctrl_map **map, unsigned *num_maps) 684 { 685 struct device_node *np; 686 unsigned reserved_maps; 687 int ret; 688 689 *map = NULL; 690 *num_maps = 0; 691 reserved_maps = 0; 692 693 for_each_child_of_node(np_config, np) { 694 ret = stm32_pctrl_dt_subnode_to_map(pctldev, np, map, 695 &reserved_maps, num_maps); 696 if (ret < 0) { 697 pinctrl_utils_free_map(pctldev, *map, *num_maps); 698 of_node_put(np); 699 return ret; 700 } 701 } 702 703 return 0; 704 } 705 706 static int stm32_pctrl_get_groups_count(struct pinctrl_dev *pctldev) 707 { 708 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); 709 710 return pctl->ngroups; 711 } 712 713 static const char *stm32_pctrl_get_group_name(struct pinctrl_dev *pctldev, 714 unsigned group) 715 { 716 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); 717 718 return pctl->groups[group].name; 719 } 720 721 static int stm32_pctrl_get_group_pins(struct pinctrl_dev *pctldev, 722 unsigned group, 723 const unsigned **pins, 724 unsigned *num_pins) 725 { 726 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); 727 728 *pins = (unsigned *)&pctl->groups[group].pin; 729 *num_pins = 1; 730 731 return 0; 732 } 733 734 static const struct pinctrl_ops stm32_pctrl_ops = { 735 .dt_node_to_map = stm32_pctrl_dt_node_to_map, 736 .dt_free_map = pinctrl_utils_free_map, 737 .get_groups_count = stm32_pctrl_get_groups_count, 738 .get_group_name = stm32_pctrl_get_group_name, 739 .get_group_pins = stm32_pctrl_get_group_pins, 740 }; 741 742 743 /* Pinmux functions */ 744 745 static int stm32_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev) 746 { 747 return ARRAY_SIZE(stm32_gpio_functions); 748 } 749 750 static const char *stm32_pmx_get_func_name(struct pinctrl_dev *pctldev, 751 unsigned selector) 752 { 753 return stm32_gpio_functions[selector]; 754 } 755 756 static int stm32_pmx_get_func_groups(struct pinctrl_dev *pctldev, 757 unsigned function, 758 const char * const **groups, 759 unsigned * const num_groups) 760 { 761 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); 762 763 *groups = pctl->grp_names; 764 *num_groups = pctl->ngroups; 765 766 return 0; 767 } 768 769 static int stm32_pmx_set_mode(struct stm32_gpio_bank *bank, 770 int pin, u32 mode, u32 alt) 771 { 772 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); 773 u32 val; 774 int alt_shift = (pin % 8) * 4; 775 int alt_offset = STM32_GPIO_AFRL + (pin / 8) * 4; 776 unsigned long flags; 777 int err = 0; 778 779 spin_lock_irqsave(&bank->lock, flags); 780 781 if (pctl->hwlock) { 782 err = hwspin_lock_timeout_in_atomic(pctl->hwlock, 783 HWSPNLCK_TIMEOUT); 784 if (err) { 785 dev_err(pctl->dev, "Can't get hwspinlock\n"); 786 goto unlock; 787 } 788 } 789 790 val = readl_relaxed(bank->base + alt_offset); 791 val &= ~GENMASK(alt_shift + 3, alt_shift); 792 val |= (alt << alt_shift); 793 writel_relaxed(val, bank->base + alt_offset); 794 795 val = readl_relaxed(bank->base + STM32_GPIO_MODER); 796 val &= ~GENMASK(pin * 2 + 1, pin * 2); 797 val |= mode << (pin * 2); 798 writel_relaxed(val, bank->base + STM32_GPIO_MODER); 799 800 if (pctl->hwlock) 801 hwspin_unlock_in_atomic(pctl->hwlock); 802 803 stm32_gpio_backup_mode(bank, pin, mode, alt); 804 805 unlock: 806 spin_unlock_irqrestore(&bank->lock, flags); 807 808 return err; 809 } 810 811 void stm32_pmx_get_mode(struct stm32_gpio_bank *bank, int pin, u32 *mode, 812 u32 *alt) 813 { 814 u32 val; 815 int alt_shift = (pin % 8) * 4; 816 int alt_offset = STM32_GPIO_AFRL + (pin / 8) * 4; 817 unsigned long flags; 818 819 spin_lock_irqsave(&bank->lock, flags); 820 821 val = readl_relaxed(bank->base + alt_offset); 822 val &= GENMASK(alt_shift + 3, alt_shift); 823 *alt = val >> alt_shift; 824 825 val = readl_relaxed(bank->base + STM32_GPIO_MODER); 826 val &= GENMASK(pin * 2 + 1, pin * 2); 827 *mode = val >> (pin * 2); 828 829 spin_unlock_irqrestore(&bank->lock, flags); 830 } 831 832 static int stm32_pmx_set_mux(struct pinctrl_dev *pctldev, 833 unsigned function, 834 unsigned group) 835 { 836 bool ret; 837 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); 838 struct stm32_pinctrl_group *g = pctl->groups + group; 839 struct pinctrl_gpio_range *range; 840 struct stm32_gpio_bank *bank; 841 u32 mode, alt; 842 int pin; 843 844 ret = stm32_pctrl_is_function_valid(pctl, g->pin, function); 845 if (!ret) 846 return -EINVAL; 847 848 range = pinctrl_find_gpio_range_from_pin(pctldev, g->pin); 849 if (!range) { 850 dev_err(pctl->dev, "No gpio range defined.\n"); 851 return -EINVAL; 852 } 853 854 bank = gpiochip_get_data(range->gc); 855 pin = stm32_gpio_pin(g->pin); 856 857 mode = stm32_gpio_get_mode(function); 858 alt = stm32_gpio_get_alt(function); 859 860 return stm32_pmx_set_mode(bank, pin, mode, alt); 861 } 862 863 static int stm32_pmx_gpio_set_direction(struct pinctrl_dev *pctldev, 864 struct pinctrl_gpio_range *range, unsigned gpio, 865 bool input) 866 { 867 struct stm32_gpio_bank *bank = gpiochip_get_data(range->gc); 868 int pin = stm32_gpio_pin(gpio); 869 870 return stm32_pmx_set_mode(bank, pin, !input, 0); 871 } 872 873 static int stm32_pmx_request(struct pinctrl_dev *pctldev, unsigned int gpio) 874 { 875 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); 876 struct pinctrl_gpio_range *range; 877 878 range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, gpio); 879 if (!range) { 880 dev_err(pctl->dev, "No gpio range defined.\n"); 881 return -EINVAL; 882 } 883 884 if (!gpiochip_line_is_valid(range->gc, stm32_gpio_pin(gpio))) { 885 dev_warn(pctl->dev, "Can't access gpio %d\n", gpio); 886 return -EACCES; 887 } 888 889 return 0; 890 } 891 892 static const struct pinmux_ops stm32_pmx_ops = { 893 .get_functions_count = stm32_pmx_get_funcs_cnt, 894 .get_function_name = stm32_pmx_get_func_name, 895 .get_function_groups = stm32_pmx_get_func_groups, 896 .set_mux = stm32_pmx_set_mux, 897 .gpio_set_direction = stm32_pmx_gpio_set_direction, 898 .request = stm32_pmx_request, 899 .strict = true, 900 }; 901 902 /* Pinconf functions */ 903 904 static int stm32_pconf_set_driving(struct stm32_gpio_bank *bank, 905 unsigned offset, u32 drive) 906 { 907 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); 908 unsigned long flags; 909 u32 val; 910 int err = 0; 911 912 spin_lock_irqsave(&bank->lock, flags); 913 914 if (pctl->hwlock) { 915 err = hwspin_lock_timeout_in_atomic(pctl->hwlock, 916 HWSPNLCK_TIMEOUT); 917 if (err) { 918 dev_err(pctl->dev, "Can't get hwspinlock\n"); 919 goto unlock; 920 } 921 } 922 923 val = readl_relaxed(bank->base + STM32_GPIO_TYPER); 924 val &= ~BIT(offset); 925 val |= drive << offset; 926 writel_relaxed(val, bank->base + STM32_GPIO_TYPER); 927 928 if (pctl->hwlock) 929 hwspin_unlock_in_atomic(pctl->hwlock); 930 931 stm32_gpio_backup_driving(bank, offset, drive); 932 933 unlock: 934 spin_unlock_irqrestore(&bank->lock, flags); 935 936 return err; 937 } 938 939 static u32 stm32_pconf_get_driving(struct stm32_gpio_bank *bank, 940 unsigned int offset) 941 { 942 unsigned long flags; 943 u32 val; 944 945 spin_lock_irqsave(&bank->lock, flags); 946 947 val = readl_relaxed(bank->base + STM32_GPIO_TYPER); 948 val &= BIT(offset); 949 950 spin_unlock_irqrestore(&bank->lock, flags); 951 952 return (val >> offset); 953 } 954 955 static int stm32_pconf_set_speed(struct stm32_gpio_bank *bank, 956 unsigned offset, u32 speed) 957 { 958 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); 959 unsigned long flags; 960 u32 val; 961 int err = 0; 962 963 spin_lock_irqsave(&bank->lock, flags); 964 965 if (pctl->hwlock) { 966 err = hwspin_lock_timeout_in_atomic(pctl->hwlock, 967 HWSPNLCK_TIMEOUT); 968 if (err) { 969 dev_err(pctl->dev, "Can't get hwspinlock\n"); 970 goto unlock; 971 } 972 } 973 974 val = readl_relaxed(bank->base + STM32_GPIO_SPEEDR); 975 val &= ~GENMASK(offset * 2 + 1, offset * 2); 976 val |= speed << (offset * 2); 977 writel_relaxed(val, bank->base + STM32_GPIO_SPEEDR); 978 979 if (pctl->hwlock) 980 hwspin_unlock_in_atomic(pctl->hwlock); 981 982 stm32_gpio_backup_speed(bank, offset, speed); 983 984 unlock: 985 spin_unlock_irqrestore(&bank->lock, flags); 986 987 return err; 988 } 989 990 static u32 stm32_pconf_get_speed(struct stm32_gpio_bank *bank, 991 unsigned int offset) 992 { 993 unsigned long flags; 994 u32 val; 995 996 spin_lock_irqsave(&bank->lock, flags); 997 998 val = readl_relaxed(bank->base + STM32_GPIO_SPEEDR); 999 val &= GENMASK(offset * 2 + 1, offset * 2); 1000 1001 spin_unlock_irqrestore(&bank->lock, flags); 1002 1003 return (val >> (offset * 2)); 1004 } 1005 1006 static int stm32_pconf_set_bias(struct stm32_gpio_bank *bank, 1007 unsigned offset, u32 bias) 1008 { 1009 struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); 1010 unsigned long flags; 1011 u32 val; 1012 int err = 0; 1013 1014 spin_lock_irqsave(&bank->lock, flags); 1015 1016 if (pctl->hwlock) { 1017 err = hwspin_lock_timeout_in_atomic(pctl->hwlock, 1018 HWSPNLCK_TIMEOUT); 1019 if (err) { 1020 dev_err(pctl->dev, "Can't get hwspinlock\n"); 1021 goto unlock; 1022 } 1023 } 1024 1025 val = readl_relaxed(bank->base + STM32_GPIO_PUPDR); 1026 val &= ~GENMASK(offset * 2 + 1, offset * 2); 1027 val |= bias << (offset * 2); 1028 writel_relaxed(val, bank->base + STM32_GPIO_PUPDR); 1029 1030 if (pctl->hwlock) 1031 hwspin_unlock_in_atomic(pctl->hwlock); 1032 1033 stm32_gpio_backup_bias(bank, offset, bias); 1034 1035 unlock: 1036 spin_unlock_irqrestore(&bank->lock, flags); 1037 1038 return err; 1039 } 1040 1041 static u32 stm32_pconf_get_bias(struct stm32_gpio_bank *bank, 1042 unsigned int offset) 1043 { 1044 unsigned long flags; 1045 u32 val; 1046 1047 spin_lock_irqsave(&bank->lock, flags); 1048 1049 val = readl_relaxed(bank->base + STM32_GPIO_PUPDR); 1050 val &= GENMASK(offset * 2 + 1, offset * 2); 1051 1052 spin_unlock_irqrestore(&bank->lock, flags); 1053 1054 return (val >> (offset * 2)); 1055 } 1056 1057 static bool stm32_pconf_get(struct stm32_gpio_bank *bank, 1058 unsigned int offset, bool dir) 1059 { 1060 unsigned long flags; 1061 u32 val; 1062 1063 spin_lock_irqsave(&bank->lock, flags); 1064 1065 if (dir) 1066 val = !!(readl_relaxed(bank->base + STM32_GPIO_IDR) & 1067 BIT(offset)); 1068 else 1069 val = !!(readl_relaxed(bank->base + STM32_GPIO_ODR) & 1070 BIT(offset)); 1071 1072 spin_unlock_irqrestore(&bank->lock, flags); 1073 1074 return val; 1075 } 1076 1077 static int stm32_pconf_parse_conf(struct pinctrl_dev *pctldev, 1078 unsigned int pin, enum pin_config_param param, 1079 enum pin_config_param arg) 1080 { 1081 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); 1082 struct pinctrl_gpio_range *range; 1083 struct stm32_gpio_bank *bank; 1084 int offset, ret = 0; 1085 1086 range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin); 1087 if (!range) { 1088 dev_err(pctl->dev, "No gpio range defined.\n"); 1089 return -EINVAL; 1090 } 1091 1092 bank = gpiochip_get_data(range->gc); 1093 offset = stm32_gpio_pin(pin); 1094 1095 if (!gpiochip_line_is_valid(range->gc, offset)) { 1096 dev_warn(pctl->dev, "Can't access gpio %d\n", pin); 1097 return -EACCES; 1098 } 1099 1100 switch (param) { 1101 case PIN_CONFIG_DRIVE_PUSH_PULL: 1102 ret = stm32_pconf_set_driving(bank, offset, 0); 1103 break; 1104 case PIN_CONFIG_DRIVE_OPEN_DRAIN: 1105 ret = stm32_pconf_set_driving(bank, offset, 1); 1106 break; 1107 case PIN_CONFIG_SLEW_RATE: 1108 ret = stm32_pconf_set_speed(bank, offset, arg); 1109 break; 1110 case PIN_CONFIG_BIAS_DISABLE: 1111 ret = stm32_pconf_set_bias(bank, offset, 0); 1112 break; 1113 case PIN_CONFIG_BIAS_PULL_UP: 1114 ret = stm32_pconf_set_bias(bank, offset, 1); 1115 break; 1116 case PIN_CONFIG_BIAS_PULL_DOWN: 1117 ret = stm32_pconf_set_bias(bank, offset, 2); 1118 break; 1119 case PIN_CONFIG_OUTPUT: 1120 __stm32_gpio_set(bank, offset, arg); 1121 ret = stm32_pmx_gpio_set_direction(pctldev, range, pin, false); 1122 break; 1123 default: 1124 ret = -ENOTSUPP; 1125 } 1126 1127 return ret; 1128 } 1129 1130 static int stm32_pconf_group_get(struct pinctrl_dev *pctldev, 1131 unsigned group, 1132 unsigned long *config) 1133 { 1134 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); 1135 1136 *config = pctl->groups[group].config; 1137 1138 return 0; 1139 } 1140 1141 static int stm32_pconf_group_set(struct pinctrl_dev *pctldev, unsigned group, 1142 unsigned long *configs, unsigned num_configs) 1143 { 1144 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); 1145 struct stm32_pinctrl_group *g = &pctl->groups[group]; 1146 int i, ret; 1147 1148 for (i = 0; i < num_configs; i++) { 1149 mutex_lock(&pctldev->mutex); 1150 ret = stm32_pconf_parse_conf(pctldev, g->pin, 1151 pinconf_to_config_param(configs[i]), 1152 pinconf_to_config_argument(configs[i])); 1153 mutex_unlock(&pctldev->mutex); 1154 if (ret < 0) 1155 return ret; 1156 1157 g->config = configs[i]; 1158 } 1159 1160 return 0; 1161 } 1162 1163 static int stm32_pconf_set(struct pinctrl_dev *pctldev, unsigned int pin, 1164 unsigned long *configs, unsigned int num_configs) 1165 { 1166 int i, ret; 1167 1168 for (i = 0; i < num_configs; i++) { 1169 ret = stm32_pconf_parse_conf(pctldev, pin, 1170 pinconf_to_config_param(configs[i]), 1171 pinconf_to_config_argument(configs[i])); 1172 if (ret < 0) 1173 return ret; 1174 } 1175 1176 return 0; 1177 } 1178 1179 static struct stm32_desc_pin * 1180 stm32_pconf_get_pin_desc_by_pin_number(struct stm32_pinctrl *pctl, 1181 unsigned int pin_number) 1182 { 1183 struct stm32_desc_pin *pins = pctl->pins; 1184 int i; 1185 1186 for (i = 0; i < pctl->npins; i++) { 1187 if (pins->pin.number == pin_number) 1188 return pins; 1189 pins++; 1190 } 1191 return NULL; 1192 } 1193 1194 static void stm32_pconf_dbg_show(struct pinctrl_dev *pctldev, 1195 struct seq_file *s, 1196 unsigned int pin) 1197 { 1198 struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); 1199 const struct stm32_desc_pin *pin_desc; 1200 struct pinctrl_gpio_range *range; 1201 struct stm32_gpio_bank *bank; 1202 int offset; 1203 u32 mode, alt, drive, speed, bias; 1204 static const char * const modes[] = { 1205 "input", "output", "alternate", "analog" }; 1206 static const char * const speeds[] = { 1207 "low", "medium", "high", "very high" }; 1208 static const char * const biasing[] = { 1209 "floating", "pull up", "pull down", "" }; 1210 bool val; 1211 1212 range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin); 1213 if (!range) 1214 return; 1215 1216 bank = gpiochip_get_data(range->gc); 1217 offset = stm32_gpio_pin(pin); 1218 1219 if (!gpiochip_line_is_valid(range->gc, offset)) { 1220 seq_puts(s, "NO ACCESS"); 1221 return; 1222 } 1223 1224 stm32_pmx_get_mode(bank, offset, &mode, &alt); 1225 bias = stm32_pconf_get_bias(bank, offset); 1226 1227 seq_printf(s, "%s ", modes[mode]); 1228 1229 switch (mode) { 1230 /* input */ 1231 case 0: 1232 val = stm32_pconf_get(bank, offset, true); 1233 seq_printf(s, "- %s - %s", 1234 val ? "high" : "low", 1235 biasing[bias]); 1236 break; 1237 1238 /* output */ 1239 case 1: 1240 drive = stm32_pconf_get_driving(bank, offset); 1241 speed = stm32_pconf_get_speed(bank, offset); 1242 val = stm32_pconf_get(bank, offset, false); 1243 seq_printf(s, "- %s - %s - %s - %s %s", 1244 val ? "high" : "low", 1245 drive ? "open drain" : "push pull", 1246 biasing[bias], 1247 speeds[speed], "speed"); 1248 break; 1249 1250 /* alternate */ 1251 case 2: 1252 drive = stm32_pconf_get_driving(bank, offset); 1253 speed = stm32_pconf_get_speed(bank, offset); 1254 pin_desc = stm32_pconf_get_pin_desc_by_pin_number(pctl, pin); 1255 if (!pin_desc) 1256 return; 1257 1258 seq_printf(s, "%d (%s) - %s - %s - %s %s", alt, 1259 pin_desc->functions[alt + 1].name, 1260 drive ? "open drain" : "push pull", 1261 biasing[bias], 1262 speeds[speed], "speed"); 1263 break; 1264 1265 /* analog */ 1266 case 3: 1267 break; 1268 } 1269 } 1270 1271 static const struct pinconf_ops stm32_pconf_ops = { 1272 .pin_config_group_get = stm32_pconf_group_get, 1273 .pin_config_group_set = stm32_pconf_group_set, 1274 .pin_config_set = stm32_pconf_set, 1275 .pin_config_dbg_show = stm32_pconf_dbg_show, 1276 }; 1277 1278 static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl, struct fwnode_handle *fwnode) 1279 { 1280 struct stm32_gpio_bank *bank = &pctl->banks[pctl->nbanks]; 1281 int bank_ioport_nr; 1282 struct pinctrl_gpio_range *range = &bank->range; 1283 struct fwnode_reference_args args; 1284 struct device *dev = pctl->dev; 1285 struct resource res; 1286 int npins = STM32_GPIO_PINS_PER_BANK; 1287 int bank_nr, err, i = 0; 1288 1289 if (!IS_ERR(bank->rstc)) 1290 reset_control_deassert(bank->rstc); 1291 1292 if (of_address_to_resource(to_of_node(fwnode), 0, &res)) 1293 return -ENODEV; 1294 1295 bank->base = devm_ioremap_resource(dev, &res); 1296 if (IS_ERR(bank->base)) 1297 return PTR_ERR(bank->base); 1298 1299 err = clk_prepare_enable(bank->clk); 1300 if (err) { 1301 dev_err(dev, "failed to prepare_enable clk (%d)\n", err); 1302 return err; 1303 } 1304 1305 bank->gpio_chip = stm32_gpio_template; 1306 1307 fwnode_property_read_string(fwnode, "st,bank-name", &bank->gpio_chip.label); 1308 1309 if (!fwnode_property_get_reference_args(fwnode, "gpio-ranges", NULL, 3, i, &args)) { 1310 bank_nr = args.args[1] / STM32_GPIO_PINS_PER_BANK; 1311 bank->gpio_chip.base = args.args[1]; 1312 1313 /* get the last defined gpio line (offset + nb of pins) */ 1314 npins = args.args[0] + args.args[2]; 1315 while (!fwnode_property_get_reference_args(fwnode, "gpio-ranges", NULL, 3, ++i, &args)) 1316 npins = max(npins, (int)(args.args[0] + args.args[2])); 1317 } else { 1318 bank_nr = pctl->nbanks; 1319 bank->gpio_chip.base = bank_nr * STM32_GPIO_PINS_PER_BANK; 1320 range->name = bank->gpio_chip.label; 1321 range->id = bank_nr; 1322 range->pin_base = range->id * STM32_GPIO_PINS_PER_BANK; 1323 range->base = range->id * STM32_GPIO_PINS_PER_BANK; 1324 range->npins = npins; 1325 range->gc = &bank->gpio_chip; 1326 pinctrl_add_gpio_range(pctl->pctl_dev, 1327 &pctl->banks[bank_nr].range); 1328 } 1329 1330 if (fwnode_property_read_u32(fwnode, "st,bank-ioport", &bank_ioport_nr)) 1331 bank_ioport_nr = bank_nr; 1332 1333 bank->gpio_chip.base = -1; 1334 1335 bank->gpio_chip.ngpio = npins; 1336 bank->gpio_chip.fwnode = fwnode; 1337 bank->gpio_chip.parent = dev; 1338 bank->bank_nr = bank_nr; 1339 bank->bank_ioport_nr = bank_ioport_nr; 1340 bank->secure_control = pctl->match_data->secure_control; 1341 spin_lock_init(&bank->lock); 1342 1343 if (pctl->domain) { 1344 /* create irq hierarchical domain */ 1345 bank->fwnode = fwnode; 1346 1347 bank->domain = irq_domain_create_hierarchy(pctl->domain, 0, STM32_GPIO_IRQ_LINE, 1348 bank->fwnode, &stm32_gpio_domain_ops, 1349 bank); 1350 1351 if (!bank->domain) { 1352 err = -ENODEV; 1353 goto err_clk; 1354 } 1355 } 1356 1357 err = gpiochip_add_data(&bank->gpio_chip, bank); 1358 if (err) { 1359 dev_err(dev, "Failed to add gpiochip(%d)!\n", bank_nr); 1360 goto err_clk; 1361 } 1362 1363 dev_info(dev, "%s bank added\n", bank->gpio_chip.label); 1364 return 0; 1365 1366 err_clk: 1367 clk_disable_unprepare(bank->clk); 1368 return err; 1369 } 1370 1371 static struct irq_domain *stm32_pctrl_get_irq_domain(struct platform_device *pdev) 1372 { 1373 struct device_node *np = pdev->dev.of_node; 1374 struct device_node *parent; 1375 struct irq_domain *domain; 1376 1377 if (!of_property_present(np, "interrupt-parent")) 1378 return NULL; 1379 1380 parent = of_irq_find_parent(np); 1381 if (!parent) 1382 return ERR_PTR(-ENXIO); 1383 1384 domain = irq_find_host(parent); 1385 of_node_put(parent); 1386 if (!domain) 1387 /* domain not registered yet */ 1388 return ERR_PTR(-EPROBE_DEFER); 1389 1390 return domain; 1391 } 1392 1393 static int stm32_pctrl_dt_setup_irq(struct platform_device *pdev, 1394 struct stm32_pinctrl *pctl) 1395 { 1396 struct device_node *np = pdev->dev.of_node; 1397 struct device *dev = &pdev->dev; 1398 struct regmap *rm; 1399 int offset, ret, i; 1400 int mask, mask_width; 1401 1402 pctl->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg"); 1403 if (IS_ERR(pctl->regmap)) 1404 return PTR_ERR(pctl->regmap); 1405 1406 rm = pctl->regmap; 1407 1408 ret = of_property_read_u32_index(np, "st,syscfg", 1, &offset); 1409 if (ret) 1410 return ret; 1411 1412 ret = of_property_read_u32_index(np, "st,syscfg", 2, &mask); 1413 if (ret) 1414 mask = SYSCFG_IRQMUX_MASK; 1415 1416 mask_width = fls(mask); 1417 1418 for (i = 0; i < STM32_GPIO_PINS_PER_BANK; i++) { 1419 struct reg_field mux; 1420 1421 mux.reg = offset + (i / 4) * 4; 1422 mux.lsb = (i % 4) * mask_width; 1423 mux.msb = mux.lsb + mask_width - 1; 1424 1425 dev_dbg(dev, "irqmux%d: reg:%#x, lsb:%d, msb:%d\n", 1426 i, mux.reg, mux.lsb, mux.msb); 1427 1428 pctl->irqmux[i] = devm_regmap_field_alloc(dev, rm, mux); 1429 if (IS_ERR(pctl->irqmux[i])) 1430 return PTR_ERR(pctl->irqmux[i]); 1431 } 1432 1433 return 0; 1434 } 1435 1436 static int stm32_pctrl_build_state(struct platform_device *pdev) 1437 { 1438 struct stm32_pinctrl *pctl = platform_get_drvdata(pdev); 1439 int i; 1440 1441 pctl->ngroups = pctl->npins; 1442 1443 /* Allocate groups */ 1444 pctl->groups = devm_kcalloc(&pdev->dev, pctl->ngroups, 1445 sizeof(*pctl->groups), GFP_KERNEL); 1446 if (!pctl->groups) 1447 return -ENOMEM; 1448 1449 /* We assume that one pin is one group, use pin name as group name. */ 1450 pctl->grp_names = devm_kcalloc(&pdev->dev, pctl->ngroups, 1451 sizeof(*pctl->grp_names), GFP_KERNEL); 1452 if (!pctl->grp_names) 1453 return -ENOMEM; 1454 1455 for (i = 0; i < pctl->npins; i++) { 1456 const struct stm32_desc_pin *pin = pctl->pins + i; 1457 struct stm32_pinctrl_group *group = pctl->groups + i; 1458 1459 group->name = pin->pin.name; 1460 group->pin = pin->pin.number; 1461 pctl->grp_names[i] = pin->pin.name; 1462 } 1463 1464 return 0; 1465 } 1466 1467 static int stm32_pctrl_create_pins_tab(struct stm32_pinctrl *pctl, 1468 struct stm32_desc_pin *pins) 1469 { 1470 const struct stm32_desc_pin *p; 1471 int i, nb_pins_available = 0; 1472 1473 for (i = 0; i < pctl->match_data->npins; i++) { 1474 p = pctl->match_data->pins + i; 1475 if (pctl->pkg && !(pctl->pkg & p->pkg)) 1476 continue; 1477 pins->pin = p->pin; 1478 memcpy((struct stm32_desc_pin *)pins->functions, p->functions, 1479 STM32_CONFIG_NUM * sizeof(struct stm32_desc_function)); 1480 pins++; 1481 nb_pins_available++; 1482 } 1483 1484 pctl->npins = nb_pins_available; 1485 1486 return 0; 1487 } 1488 1489 int stm32_pctl_probe(struct platform_device *pdev) 1490 { 1491 const struct stm32_pinctrl_match_data *match_data; 1492 struct fwnode_handle *child; 1493 struct device *dev = &pdev->dev; 1494 struct stm32_pinctrl *pctl; 1495 struct pinctrl_pin_desc *pins; 1496 int i, ret, hwlock_id; 1497 unsigned int banks; 1498 1499 match_data = device_get_match_data(dev); 1500 if (!match_data) 1501 return -EINVAL; 1502 1503 pctl = devm_kzalloc(dev, sizeof(*pctl), GFP_KERNEL); 1504 if (!pctl) 1505 return -ENOMEM; 1506 1507 platform_set_drvdata(pdev, pctl); 1508 1509 /* check for IRQ controller (may require deferred probe) */ 1510 pctl->domain = stm32_pctrl_get_irq_domain(pdev); 1511 if (IS_ERR(pctl->domain)) 1512 return PTR_ERR(pctl->domain); 1513 if (!pctl->domain) 1514 dev_warn(dev, "pinctrl without interrupt support\n"); 1515 1516 /* hwspinlock is optional */ 1517 hwlock_id = of_hwspin_lock_get_id(pdev->dev.of_node, 0); 1518 if (hwlock_id < 0) { 1519 if (hwlock_id == -EPROBE_DEFER) 1520 return hwlock_id; 1521 } else { 1522 pctl->hwlock = hwspin_lock_request_specific(hwlock_id); 1523 } 1524 1525 spin_lock_init(&pctl->irqmux_lock); 1526 1527 pctl->dev = dev; 1528 pctl->match_data = match_data; 1529 1530 /* get optional package information */ 1531 if (!device_property_read_u32(dev, "st,package", &pctl->pkg)) 1532 dev_dbg(pctl->dev, "package detected: %x\n", pctl->pkg); 1533 1534 pctl->pins = devm_kcalloc(pctl->dev, pctl->match_data->npins, 1535 sizeof(*pctl->pins), GFP_KERNEL); 1536 if (!pctl->pins) 1537 return -ENOMEM; 1538 1539 ret = stm32_pctrl_create_pins_tab(pctl, pctl->pins); 1540 if (ret) 1541 return ret; 1542 1543 ret = stm32_pctrl_build_state(pdev); 1544 if (ret) { 1545 dev_err(dev, "build state failed: %d\n", ret); 1546 return -EINVAL; 1547 } 1548 1549 if (pctl->domain) { 1550 ret = stm32_pctrl_dt_setup_irq(pdev, pctl); 1551 if (ret) 1552 return ret; 1553 } 1554 1555 pins = devm_kcalloc(&pdev->dev, pctl->npins, sizeof(*pins), 1556 GFP_KERNEL); 1557 if (!pins) 1558 return -ENOMEM; 1559 1560 for (i = 0; i < pctl->npins; i++) 1561 pins[i] = pctl->pins[i].pin; 1562 1563 pctl->pctl_desc.name = dev_name(&pdev->dev); 1564 pctl->pctl_desc.owner = THIS_MODULE; 1565 pctl->pctl_desc.pins = pins; 1566 pctl->pctl_desc.npins = pctl->npins; 1567 pctl->pctl_desc.link_consumers = true; 1568 pctl->pctl_desc.confops = &stm32_pconf_ops; 1569 pctl->pctl_desc.pctlops = &stm32_pctrl_ops; 1570 pctl->pctl_desc.pmxops = &stm32_pmx_ops; 1571 pctl->dev = &pdev->dev; 1572 1573 pctl->pctl_dev = devm_pinctrl_register(&pdev->dev, &pctl->pctl_desc, 1574 pctl); 1575 1576 if (IS_ERR(pctl->pctl_dev)) { 1577 dev_err(&pdev->dev, "Failed pinctrl registration\n"); 1578 return PTR_ERR(pctl->pctl_dev); 1579 } 1580 1581 banks = gpiochip_node_count(dev); 1582 if (!banks) { 1583 dev_err(dev, "at least one GPIO bank is required\n"); 1584 return -EINVAL; 1585 } 1586 pctl->banks = devm_kcalloc(dev, banks, sizeof(*pctl->banks), 1587 GFP_KERNEL); 1588 if (!pctl->banks) 1589 return -ENOMEM; 1590 1591 i = 0; 1592 for_each_gpiochip_node(dev, child) { 1593 struct stm32_gpio_bank *bank = &pctl->banks[i]; 1594 struct device_node *np = to_of_node(child); 1595 1596 bank->rstc = of_reset_control_get_exclusive(np, NULL); 1597 if (PTR_ERR(bank->rstc) == -EPROBE_DEFER) { 1598 fwnode_handle_put(child); 1599 return -EPROBE_DEFER; 1600 } 1601 1602 bank->clk = of_clk_get_by_name(np, NULL); 1603 if (IS_ERR(bank->clk)) { 1604 fwnode_handle_put(child); 1605 return dev_err_probe(dev, PTR_ERR(bank->clk), 1606 "failed to get clk\n"); 1607 } 1608 i++; 1609 } 1610 1611 for_each_gpiochip_node(dev, child) { 1612 ret = stm32_gpiolib_register_bank(pctl, child); 1613 if (ret) { 1614 fwnode_handle_put(child); 1615 1616 for (i = 0; i < pctl->nbanks; i++) 1617 clk_disable_unprepare(pctl->banks[i].clk); 1618 1619 return ret; 1620 } 1621 1622 pctl->nbanks++; 1623 } 1624 1625 dev_info(dev, "Pinctrl STM32 initialized\n"); 1626 1627 return 0; 1628 } 1629 1630 static int __maybe_unused stm32_pinctrl_restore_gpio_regs( 1631 struct stm32_pinctrl *pctl, u32 pin) 1632 { 1633 const struct pin_desc *desc = pin_desc_get(pctl->pctl_dev, pin); 1634 u32 val, alt, mode, offset = stm32_gpio_pin(pin); 1635 struct pinctrl_gpio_range *range; 1636 struct stm32_gpio_bank *bank; 1637 bool pin_is_irq; 1638 int ret; 1639 1640 range = pinctrl_find_gpio_range_from_pin(pctl->pctl_dev, pin); 1641 if (!range) 1642 return 0; 1643 1644 if (!gpiochip_line_is_valid(range->gc, offset)) 1645 return 0; 1646 1647 pin_is_irq = gpiochip_line_is_irq(range->gc, offset); 1648 1649 if (!desc || (!pin_is_irq && !desc->gpio_owner)) 1650 return 0; 1651 1652 bank = gpiochip_get_data(range->gc); 1653 1654 alt = bank->pin_backup[offset] & STM32_GPIO_BKP_ALT_MASK; 1655 alt >>= STM32_GPIO_BKP_ALT_SHIFT; 1656 mode = bank->pin_backup[offset] & STM32_GPIO_BKP_MODE_MASK; 1657 mode >>= STM32_GPIO_BKP_MODE_SHIFT; 1658 1659 ret = stm32_pmx_set_mode(bank, offset, mode, alt); 1660 if (ret) 1661 return ret; 1662 1663 if (mode == 1) { 1664 val = bank->pin_backup[offset] & BIT(STM32_GPIO_BKP_VAL); 1665 val = val >> STM32_GPIO_BKP_VAL; 1666 __stm32_gpio_set(bank, offset, val); 1667 } 1668 1669 val = bank->pin_backup[offset] & BIT(STM32_GPIO_BKP_TYPE); 1670 val >>= STM32_GPIO_BKP_TYPE; 1671 ret = stm32_pconf_set_driving(bank, offset, val); 1672 if (ret) 1673 return ret; 1674 1675 val = bank->pin_backup[offset] & STM32_GPIO_BKP_SPEED_MASK; 1676 val >>= STM32_GPIO_BKP_SPEED_SHIFT; 1677 ret = stm32_pconf_set_speed(bank, offset, val); 1678 if (ret) 1679 return ret; 1680 1681 val = bank->pin_backup[offset] & STM32_GPIO_BKP_PUPD_MASK; 1682 val >>= STM32_GPIO_BKP_PUPD_SHIFT; 1683 ret = stm32_pconf_set_bias(bank, offset, val); 1684 if (ret) 1685 return ret; 1686 1687 if (pin_is_irq) 1688 regmap_field_write(pctl->irqmux[offset], bank->bank_ioport_nr); 1689 1690 return 0; 1691 } 1692 1693 int __maybe_unused stm32_pinctrl_suspend(struct device *dev) 1694 { 1695 struct stm32_pinctrl *pctl = dev_get_drvdata(dev); 1696 int i; 1697 1698 for (i = 0; i < pctl->nbanks; i++) 1699 clk_disable(pctl->banks[i].clk); 1700 1701 return 0; 1702 } 1703 1704 int __maybe_unused stm32_pinctrl_resume(struct device *dev) 1705 { 1706 struct stm32_pinctrl *pctl = dev_get_drvdata(dev); 1707 struct stm32_pinctrl_group *g = pctl->groups; 1708 int i; 1709 1710 for (i = 0; i < pctl->nbanks; i++) 1711 clk_enable(pctl->banks[i].clk); 1712 1713 for (i = 0; i < pctl->ngroups; i++, g++) 1714 stm32_pinctrl_restore_gpio_regs(pctl, g->pin); 1715 1716 return 0; 1717 } 1718