drivers/pinctrl/stm32/pinctrl-stm32.c

   1 /*
   2  * Copyright (C) Maxime Coquelin 2015
   3  * Author:  Maxime Coquelin <mcoquelin.stm32@gmail.com>
   4  * License terms:  GNU General Public License (GPL), version 2
   5  *
   6  * Heavily based on Mediatek's pinctrl driver
   7  */
   8 #include <linux/clk.h>
   9 #include <linux/gpio/driver.h>
  10 #include <linux/io.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/of_address.h>
  14 #include <linux/of_device.h>
  15 #include <linux/of_irq.h>
  16 #include <linux/pinctrl/consumer.h>
  17 #include <linux/pinctrl/machine.h>
  18 #include <linux/pinctrl/pinconf.h>
  19 #include <linux/pinctrl/pinconf-generic.h>
  20 #include <linux/pinctrl/pinctrl.h>
  21 #include <linux/pinctrl/pinmux.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/reset.h>
  24 #include <linux/slab.h>
  25
  26 #include "../core.h"
  27 #include "../pinconf.h"
  28 #include "../pinctrl-utils.h"
  29 #include "pinctrl-stm32.h"
  30
  31 #define STM32_GPIO_MODER        0x00
  32 #define STM32_GPIO_TYPER        0x04
  33 #define STM32_GPIO_SPEEDR       0x08
  34 #define STM32_GPIO_PUPDR        0x0c
  35 #define STM32_GPIO_IDR          0x10
  36 #define STM32_GPIO_ODR          0x14
  37 #define STM32_GPIO_BSRR         0x18
  38 #define STM32_GPIO_LCKR         0x1c
  39 #define STM32_GPIO_AFRL         0x20
  40 #define STM32_GPIO_AFRH         0x24
  41
  42 #define STM32_GPIO_PINS_PER_BANK 16
  43
  44 #define gpio_range_to_bank(chip) \
  45                 container_of(chip, struct stm32_gpio_bank, range)
  46
  47 static const char * const stm32_gpio_functions[] = {
  48         "gpio", "af0", "af1",
  49         "af2", "af3", "af4",
  50         "af5", "af6", "af7",
  51         "af8", "af9", "af10",
  52         "af11", "af12", "af13",
  53         "af14", "af15", "analog",
  54 };
  55
  56 struct stm32_pinctrl_group {
  57         const char *name;
  58         unsigned long config;
  59         unsigned pin;
  60 };
  61
  62 struct stm32_gpio_bank {
  63         void __iomem *base;
  64         struct clk *clk;
  65         spinlock_t lock;
  66         struct gpio_chip gpio_chip;
  67         struct pinctrl_gpio_range range;
  68 };
  69
  70 struct stm32_pinctrl {
  71         struct device *dev;
  72         struct pinctrl_dev *pctl_dev;
  73         struct pinctrl_desc pctl_desc;
  74         struct stm32_pinctrl_group *groups;
  75         unsigned ngroups;
  76         const char **grp_names;
  77         struct stm32_gpio_bank *banks;
  78         unsigned nbanks;
  79         const struct stm32_pinctrl_match_data *match_data;
  80 };
  81
  82 static inline int stm32_gpio_pin(int gpio)
  83 {
  84         return gpio % STM32_GPIO_PINS_PER_BANK;
  85 }
  86
  87 static inline u32 stm32_gpio_get_mode(u32 function)
  88 {
  89         switch (function) {
  90         case STM32_PIN_GPIO:
  91                 return 0;
  92         case STM32_PIN_AF(0) ... STM32_PIN_AF(15):
  93                 return 2;
  94         case STM32_PIN_ANALOG:
  95                 return 3;
  96         }
  97
  98         return 0;
  99 }
 100
 101 static inline u32 stm32_gpio_get_alt(u32 function)
 102 {
 103         switch (function) {
 104         case STM32_PIN_GPIO:
 105                 return 0;
 106         case STM32_PIN_AF(0) ... STM32_PIN_AF(15):
 107                 return function - 1;
 108         case STM32_PIN_ANALOG:
 109                 return 0;
 110         }
 111
 112         return 0;
 113 }
 114
 115 /* GPIO functions */
 116
 117 static inline void __stm32_gpio_set(struct stm32_gpio_bank *bank,
 118         unsigned offset, int value)
 119 {
 120         if (!value)
 121                 offset += STM32_GPIO_PINS_PER_BANK;
 122
 123         clk_enable(bank->clk);
 124
 125         writel_relaxed(BIT(offset), bank->base + STM32_GPIO_BSRR);
 126
 127         clk_disable(bank->clk);
 128 }
 129
 130 static int stm32_gpio_request(struct gpio_chip *chip, unsigned offset)
 131 {
 132         return pinctrl_request_gpio(chip->base + offset);
 133 }
 134
 135 static void stm32_gpio_free(struct gpio_chip *chip, unsigned offset)
 136 {
 137         pinctrl_free_gpio(chip->base + offset);
 138 }
 139
 140 static int stm32_gpio_get(struct gpio_chip *chip, unsigned offset)
 141 {
 142         struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
 143         int ret;
 144
 145         clk_enable(bank->clk);
 146
 147         ret = !!(readl_relaxed(bank->base + STM32_GPIO_IDR) & BIT(offset));
 148
 149         clk_disable(bank->clk);
 150
 151         return ret;
 152 }
 153
 154 static void stm32_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 155 {
 156         struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
 157
 158         __stm32_gpio_set(bank, offset, value);
 159 }
 160
 161 static int stm32_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 162 {
 163         return pinctrl_gpio_direction_input(chip->base + offset);
 164 }
 165
 166 static int stm32_gpio_direction_output(struct gpio_chip *chip,
 167         unsigned offset, int value)
 168 {
 169         struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
 170
 171         __stm32_gpio_set(bank, offset, value);
 172         pinctrl_gpio_direction_output(chip->base + offset);
 173
 174         return 0;
 175 }
 176
 177 static struct gpio_chip stm32_gpio_template = {
 178         .request                = stm32_gpio_request,
 179         .free                   = stm32_gpio_free,
 180         .get                    = stm32_gpio_get,
 181         .set                    = stm32_gpio_set,
 182         .direction_input        = stm32_gpio_direction_input,
 183         .direction_output       = stm32_gpio_direction_output,
 184 };
 185
 186 /* Pinctrl functions */
 187
 188 static struct stm32_pinctrl_group *
 189 stm32_pctrl_find_group_by_pin(struct stm32_pinctrl *pctl, u32 pin)
 190 {
 191         int i;
 192
 193         for (i = 0; i < pctl->ngroups; i++) {
 194                 struct stm32_pinctrl_group *grp = pctl->groups + i;
 195
 196                 if (grp->pin == pin)
 197                         return grp;
 198         }
 199
 200         return NULL;
 201 }
 202
 203 static bool stm32_pctrl_is_function_valid(struct stm32_pinctrl *pctl,
 204                 u32 pin_num, u32 fnum)
 205 {
 206         int i;
 207
 208         for (i = 0; i < pctl->match_data->npins; i++) {
 209                 const struct stm32_desc_pin *pin = pctl->match_data->pins + i;
 210                 const struct stm32_desc_function *func = pin->functions;
 211
 212                 if (pin->pin.number != pin_num)
 213                         continue;
 214
 215                 while (func && func->name) {
 216                         if (func->num == fnum)
 217                                 return true;
 218                         func++;
 219                 }
 220
 221                 break;
 222         }
 223
 224         return false;
 225 }
 226
 227 static int stm32_pctrl_dt_node_to_map_func(struct stm32_pinctrl *pctl,
 228                 u32 pin, u32 fnum, struct stm32_pinctrl_group *grp,
 229                 struct pinctrl_map **map, unsigned *reserved_maps,
 230                 unsigned *num_maps)
 231 {
 232         if (*num_maps == *reserved_maps)
 233                 return -ENOSPC;
 234
 235         (*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
 236         (*map)[*num_maps].data.mux.group = grp->name;
 237
 238         if (!stm32_pctrl_is_function_valid(pctl, pin, fnum)) {
 239                 dev_err(pctl->dev, "invalid function %d on pin %d .\n",
 240                                 fnum, pin);
 241                 return -EINVAL;
 242         }
 243
 244         (*map)[*num_maps].data.mux.function = stm32_gpio_functions[fnum];
 245         (*num_maps)++;
 246
 247         return 0;
 248 }
 249
 250 static int stm32_pctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
 251                                       struct device_node *node,
 252                                       struct pinctrl_map **map,
 253                                       unsigned *reserved_maps,
 254                                       unsigned *num_maps)
 255 {
 256         struct stm32_pinctrl *pctl;
 257         struct stm32_pinctrl_group *grp;
 258         struct property *pins;
 259         u32 pinfunc, pin, func;
 260         unsigned long *configs;
 261         unsigned int num_configs;
 262         bool has_config = 0;
 263         unsigned reserve = 0;
 264         int num_pins, num_funcs, maps_per_pin, i, err;
 265
 266         pctl = pinctrl_dev_get_drvdata(pctldev);
 267
 268         pins = of_find_property(node, "pinmux", NULL);
 269         if (!pins) {
 270                 dev_err(pctl->dev, "missing pins property in node %s .\n",
 271                                 node->name);
 272                 return -EINVAL;
 273         }
 274
 275         err = pinconf_generic_parse_dt_config(node, pctldev, &configs,
 276                 &num_configs);
 277         if (err)
 278                 return err;
 279
 280         if (num_configs)
 281                 has_config = 1;
 282
 283         num_pins = pins->length / sizeof(u32);
 284         num_funcs = num_pins;
 285         maps_per_pin = 0;
 286         if (num_funcs)
 287                 maps_per_pin++;
 288         if (has_config && num_pins >= 1)
 289                 maps_per_pin++;
 290
 291         if (!num_pins || !maps_per_pin)
 292                 return -EINVAL;
 293
 294         reserve = num_pins * maps_per_pin;
 295
 296         err = pinctrl_utils_reserve_map(pctldev, map,
 297                         reserved_maps, num_maps, reserve);
 298         if (err)
 299                 return err;
 300
 301         for (i = 0; i < num_pins; i++) {
 302                 err = of_property_read_u32_index(node, "pinmux",
 303                                 i, &pinfunc);
 304                 if (err)
 305                         return err;
 306
 307                 pin = STM32_GET_PIN_NO(pinfunc);
 308                 func = STM32_GET_PIN_FUNC(pinfunc);
 309
 310                 if (pin >= pctl->match_data->npins) {
 311                         dev_err(pctl->dev, "invalid pin number.\n");
 312                         return -EINVAL;
 313                 }
 314
 315                 if (!stm32_pctrl_is_function_valid(pctl, pin, func)) {
 316                         dev_err(pctl->dev, "invalid function.\n");
 317                         return -EINVAL;
 318                 }
 319
 320                 grp = stm32_pctrl_find_group_by_pin(pctl, pin);
 321                 if (!grp) {
 322                         dev_err(pctl->dev, "unable to match pin %d to group\n",
 323                                         pin);
 324                         return -EINVAL;
 325                 }
 326
 327                 err = stm32_pctrl_dt_node_to_map_func(pctl, pin, func, grp, map,
 328                                 reserved_maps, num_maps);
 329                 if (err)
 330                         return err;
 331
 332                 if (has_config) {
 333                         err = pinctrl_utils_add_map_configs(pctldev, map,
 334                                         reserved_maps, num_maps, grp->name,
 335                                         configs, num_configs,
 336                                         PIN_MAP_TYPE_CONFIGS_GROUP);
 337                         if (err)
 338                                 return err;
 339                 }
 340         }
 341
 342         return 0;
 343 }
 344
 345 static int stm32_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
 346                                  struct device_node *np_config,
 347                                  struct pinctrl_map **map, unsigned *num_maps)
 348 {
 349         struct device_node *np;
 350         unsigned reserved_maps;
 351         int ret;
 352
 353         *map = NULL;
 354         *num_maps = 0;
 355         reserved_maps = 0;
 356
 357         for_each_child_of_node(np_config, np) {
 358                 ret = stm32_pctrl_dt_subnode_to_map(pctldev, np, map,
 359                                 &reserved_maps, num_maps);
 360                 if (ret < 0) {
 361                         pinctrl_utils_dt_free_map(pctldev, *map, *num_maps);
 362                         return ret;
 363                 }
 364         }
 365
 366         return 0;
 367 }
 368
 369 static int stm32_pctrl_get_groups_count(struct pinctrl_dev *pctldev)
 370 {
 371         struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 372
 373         return pctl->ngroups;
 374 }
 375
 376 static const char *stm32_pctrl_get_group_name(struct pinctrl_dev *pctldev,
 377                                               unsigned group)
 378 {
 379         struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 380
 381         return pctl->groups[group].name;
 382 }
 383
 384 static int stm32_pctrl_get_group_pins(struct pinctrl_dev *pctldev,
 385                                       unsigned group,
 386                                       const unsigned **pins,
 387                                       unsigned *num_pins)
 388 {
 389         struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 390
 391         *pins = (unsigned *)&pctl->groups[group].pin;
 392         *num_pins = 1;
 393
 394         return 0;
 395 }
 396
 397 static const struct pinctrl_ops stm32_pctrl_ops = {
 398         .dt_node_to_map         = stm32_pctrl_dt_node_to_map,
 399         .dt_free_map            = pinctrl_utils_dt_free_map,
 400         .get_groups_count       = stm32_pctrl_get_groups_count,
 401         .get_group_name         = stm32_pctrl_get_group_name,
 402         .get_group_pins         = stm32_pctrl_get_group_pins,
 403 };
 404
 405
 406 /* Pinmux functions */
 407
 408 static int stm32_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev)
 409 {
 410         return ARRAY_SIZE(stm32_gpio_functions);
 411 }
 412
 413 static const char *stm32_pmx_get_func_name(struct pinctrl_dev *pctldev,
 414                                            unsigned selector)
 415 {
 416         return stm32_gpio_functions[selector];
 417 }
 418
 419 static int stm32_pmx_get_func_groups(struct pinctrl_dev *pctldev,
 420                                      unsigned function,
 421                                      const char * const **groups,
 422                                      unsigned * const num_groups)
 423 {
 424         struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 425
 426         *groups = pctl->grp_names;
 427         *num_groups = pctl->ngroups;
 428
 429         return 0;
 430 }
 431
 432 static void stm32_pmx_set_mode(struct stm32_gpio_bank *bank,
 433                 int pin, u32 mode, u32 alt)
 434 {
 435         u32 val;
 436         int alt_shift = (pin % 8) * 4;
 437         int alt_offset = STM32_GPIO_AFRL + (pin / 8) * 4;
 438         unsigned long flags;
 439
 440         clk_enable(bank->clk);
 441         spin_lock_irqsave(&bank->lock, flags);
 442
 443         val = readl_relaxed(bank->base + alt_offset);
 444         val &= ~GENMASK(alt_shift + 3, alt_shift);
 445         val |= (alt << alt_shift);
 446         writel_relaxed(val, bank->base + alt_offset);
 447
 448         val = readl_relaxed(bank->base + STM32_GPIO_MODER);
 449         val &= ~GENMASK(pin * 2 + 1, pin * 2);
 450         val |= mode << (pin * 2);
 451         writel_relaxed(val, bank->base + STM32_GPIO_MODER);
 452
 453         spin_unlock_irqrestore(&bank->lock, flags);
 454         clk_disable(bank->clk);
 455 }
 456
 457 static int stm32_pmx_set_mux(struct pinctrl_dev *pctldev,
 458                             unsigned function,
 459                             unsigned group)
 460 {
 461         bool ret;
 462         struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 463         struct stm32_pinctrl_group *g = pctl->groups + group;
 464         struct pinctrl_gpio_range *range;
 465         struct stm32_gpio_bank *bank;
 466         u32 mode, alt;
 467         int pin;
 468
 469         ret = stm32_pctrl_is_function_valid(pctl, g->pin, function);
 470         if (!ret) {
 471                 dev_err(pctl->dev, "invalid function %d on group %d .\n",
 472                                 function, group);
 473                 return -EINVAL;
 474         }
 475
 476         range = pinctrl_find_gpio_range_from_pin(pctldev, g->pin);
 477         bank = gpio_range_to_bank(range);
 478         pin = stm32_gpio_pin(g->pin);
 479
 480         mode = stm32_gpio_get_mode(function);
 481         alt = stm32_gpio_get_alt(function);
 482
 483         stm32_pmx_set_mode(bank, pin, mode, alt);
 484
 485         return 0;
 486 }
 487
 488 static int stm32_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
 489                         struct pinctrl_gpio_range *range, unsigned gpio,
 490                         bool input)
 491 {
 492         struct stm32_gpio_bank *bank = gpio_range_to_bank(range);
 493         int pin = stm32_gpio_pin(gpio);
 494
 495         stm32_pmx_set_mode(bank, pin, !input, 0);
 496
 497         return 0;
 498 }
 499
 500 static const struct pinmux_ops stm32_pmx_ops = {
 501         .get_functions_count    = stm32_pmx_get_funcs_cnt,
 502         .get_function_name      = stm32_pmx_get_func_name,
 503         .get_function_groups    = stm32_pmx_get_func_groups,
 504         .set_mux                = stm32_pmx_set_mux,
 505         .gpio_set_direction     = stm32_pmx_gpio_set_direction,
 506 };
 507
 508 /* Pinconf functions */
 509
 510 static void stm32_pconf_set_driving(struct stm32_gpio_bank *bank,
 511         unsigned offset, u32 drive)
 512 {
 513         unsigned long flags;
 514         u32 val;
 515
 516         clk_enable(bank->clk);
 517         spin_lock_irqsave(&bank->lock, flags);
 518
 519         val = readl_relaxed(bank->base + STM32_GPIO_TYPER);
 520         val &= ~BIT(offset);
 521         val |= drive << offset;
 522         writel_relaxed(val, bank->base + STM32_GPIO_TYPER);
 523
 524         spin_unlock_irqrestore(&bank->lock, flags);
 525         clk_disable(bank->clk);
 526 }
 527
 528 static void stm32_pconf_set_speed(struct stm32_gpio_bank *bank,
 529         unsigned offset, u32 speed)
 530 {
 531         unsigned long flags;
 532         u32 val;
 533
 534         clk_enable(bank->clk);
 535         spin_lock_irqsave(&bank->lock, flags);
 536
 537         val = readl_relaxed(bank->base + STM32_GPIO_SPEEDR);
 538         val &= ~GENMASK(offset * 2 + 1, offset * 2);
 539         val |= speed << (offset * 2);
 540         writel_relaxed(val, bank->base + STM32_GPIO_SPEEDR);
 541
 542         spin_unlock_irqrestore(&bank->lock, flags);
 543         clk_disable(bank->clk);
 544 }
 545
 546 static void stm32_pconf_set_bias(struct stm32_gpio_bank *bank,
 547         unsigned offset, u32 bias)
 548 {
 549         unsigned long flags;
 550         u32 val;
 551
 552         clk_enable(bank->clk);
 553         spin_lock_irqsave(&bank->lock, flags);
 554
 555         val = readl_relaxed(bank->base + STM32_GPIO_PUPDR);
 556         val &= ~GENMASK(offset * 2 + 1, offset * 2);
 557         val |= bias << (offset * 2);
 558         writel_relaxed(val, bank->base + STM32_GPIO_PUPDR);
 559
 560         spin_unlock_irqrestore(&bank->lock, flags);
 561         clk_disable(bank->clk);
 562 }
 563
 564 static int stm32_pconf_parse_conf(struct pinctrl_dev *pctldev,
 565                 unsigned int pin, enum pin_config_param param,
 566                 enum pin_config_param arg)
 567 {
 568         struct pinctrl_gpio_range *range;
 569         struct stm32_gpio_bank *bank;
 570         int offset, ret = 0;
 571
 572         range = pinctrl_find_gpio_range_from_pin(pctldev, pin);
 573         bank = gpio_range_to_bank(range);
 574         offset = stm32_gpio_pin(pin);
 575
 576         switch (param) {
 577         case PIN_CONFIG_DRIVE_PUSH_PULL:
 578                 stm32_pconf_set_driving(bank, offset, 0);
 579                 break;
 580         case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 581                 stm32_pconf_set_driving(bank, offset, 1);
 582                 break;
 583         case PIN_CONFIG_SLEW_RATE:
 584                 stm32_pconf_set_speed(bank, offset, arg);
 585                 break;
 586         case PIN_CONFIG_BIAS_DISABLE:
 587                 stm32_pconf_set_bias(bank, offset, 0);
 588                 break;
 589         case PIN_CONFIG_BIAS_PULL_UP:
 590                 stm32_pconf_set_bias(bank, offset, 1);
 591                 break;
 592         case PIN_CONFIG_BIAS_PULL_DOWN:
 593                 stm32_pconf_set_bias(bank, offset, 2);
 594                 break;
 595         case PIN_CONFIG_OUTPUT:
 596                 __stm32_gpio_set(bank, offset, arg);
 597                 ret = stm32_pmx_gpio_set_direction(pctldev, NULL, pin, false);
 598                 break;
 599         default:
 600                 ret = -EINVAL;
 601         }
 602
 603         return ret;
 604 }
 605
 606 static int stm32_pconf_group_get(struct pinctrl_dev *pctldev,
 607                                  unsigned group,
 608                                  unsigned long *config)
 609 {
 610         struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 611
 612         *config = pctl->groups[group].config;
 613
 614         return 0;
 615 }
 616
 617 static int stm32_pconf_group_set(struct pinctrl_dev *pctldev, unsigned group,
 618                                  unsigned long *configs, unsigned num_configs)
 619 {
 620         struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 621         struct stm32_pinctrl_group *g = &pctl->groups[group];
 622         int i, ret;
 623
 624         for (i = 0; i < num_configs; i++) {
 625                 ret = stm32_pconf_parse_conf(pctldev, g->pin,
 626                         pinconf_to_config_param(configs[i]),
 627                         pinconf_to_config_argument(configs[i]));
 628                 if (ret < 0)
 629                         return ret;
 630
 631                 g->config = configs[i];
 632         }
 633
 634         return 0;
 635 }
 636
 637 static const struct pinconf_ops stm32_pconf_ops = {
 638         .pin_config_group_get   = stm32_pconf_group_get,
 639         .pin_config_group_set   = stm32_pconf_group_set,
 640 };
 641
 642 static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl,
 643         struct device_node *np)
 644 {
 645         int bank_nr = pctl->nbanks;
 646         struct stm32_gpio_bank *bank = &pctl->banks[bank_nr];
 647         struct pinctrl_gpio_range *range = &bank->range;
 648         struct device *dev = pctl->dev;
 649         struct resource res;
 650         struct reset_control *rstc;
 651         int err, npins;
 652
 653         rstc = of_reset_control_get(np, NULL);
 654         if (!IS_ERR(rstc))
 655                 reset_control_deassert(rstc);
 656
 657         if (of_address_to_resource(np, 0, &res))
 658                 return -ENODEV;
 659
 660         bank->base = devm_ioremap_resource(dev, &res);
 661         if (IS_ERR(bank->base))
 662                 return PTR_ERR(bank->base);
 663
 664         bank->clk = of_clk_get_by_name(np, NULL);
 665         if (IS_ERR(bank->clk)) {
 666                 dev_err(dev, "failed to get clk (%ld)\n", PTR_ERR(bank->clk));
 667                 return PTR_ERR(bank->clk);
 668         }
 669
 670         err = clk_prepare(bank->clk);
 671         if (err) {
 672                 dev_err(dev, "failed to prepare clk (%d)\n", err);
 673                 return err;
 674         }
 675
 676         npins = pctl->match_data->npins;
 677         npins -= bank_nr * STM32_GPIO_PINS_PER_BANK;
 678         if (npins < 0)
 679                 return -EINVAL;
 680         else if (npins > STM32_GPIO_PINS_PER_BANK)
 681                 npins = STM32_GPIO_PINS_PER_BANK;
 682
 683         bank->gpio_chip = stm32_gpio_template;
 684         bank->gpio_chip.base = bank_nr * STM32_GPIO_PINS_PER_BANK;
 685         bank->gpio_chip.ngpio = npins;
 686         bank->gpio_chip.of_node = np;
 687         bank->gpio_chip.parent = dev;
 688         spin_lock_init(&bank->lock);
 689
 690         of_property_read_string(np, "st,bank-name", &range->name);
 691         bank->gpio_chip.label = range->name;
 692
 693         range->id = bank_nr;
 694         range->pin_base = range->base = range->id * STM32_GPIO_PINS_PER_BANK;
 695         range->npins = bank->gpio_chip.ngpio;
 696         range->gc = &bank->gpio_chip;
 697         err = gpiochip_add_data(&bank->gpio_chip, bank);
 698         if (err) {
 699                 dev_err(dev, "Failed to add gpiochip(%d)!\n", bank_nr);
 700                 return err;
 701         }
 702
 703         dev_info(dev, "%s bank added\n", range->name);
 704         return 0;
 705 }
 706
 707 static int stm32_pctrl_build_state(struct platform_device *pdev)
 708 {
 709         struct stm32_pinctrl *pctl = platform_get_drvdata(pdev);
 710         int i;
 711
 712         pctl->ngroups = pctl->match_data->npins;
 713
 714         /* Allocate groups */
 715         pctl->groups = devm_kcalloc(&pdev->dev, pctl->ngroups,
 716                                     sizeof(*pctl->groups), GFP_KERNEL);
 717         if (!pctl->groups)
 718                 return -ENOMEM;
 719
 720         /* We assume that one pin is one group, use pin name as group name. */
 721         pctl->grp_names = devm_kcalloc(&pdev->dev, pctl->ngroups,
 722                                        sizeof(*pctl->grp_names), GFP_KERNEL);
 723         if (!pctl->grp_names)
 724                 return -ENOMEM;
 725
 726         for (i = 0; i < pctl->match_data->npins; i++) {
 727                 const struct stm32_desc_pin *pin = pctl->match_data->pins + i;
 728                 struct stm32_pinctrl_group *group = pctl->groups + i;
 729
 730                 group->name = pin->pin.name;
 731                 group->pin = pin->pin.number;
 732
 733                 pctl->grp_names[i] = pin->pin.name;
 734         }
 735
 736         return 0;
 737 }
 738
 739 int stm32_pctl_probe(struct platform_device *pdev)
 740 {
 741         struct device_node *np = pdev->dev.of_node;
 742         struct device_node *child;
 743         const struct of_device_id *match;
 744         struct device *dev = &pdev->dev;
 745         struct stm32_pinctrl *pctl;
 746         struct pinctrl_pin_desc *pins;
 747         int i, ret, banks = 0;
 748
 749         if (!np)
 750                 return -EINVAL;
 751
 752         match = of_match_device(dev->driver->of_match_table, dev);
 753         if (!match || !match->data)
 754                 return -EINVAL;
 755
 756         if (!of_find_property(np, "pins-are-numbered", NULL)) {
 757                 dev_err(dev, "only support pins-are-numbered format\n");
 758                 return -EINVAL;
 759         }
 760
 761         pctl = devm_kzalloc(dev, sizeof(*pctl), GFP_KERNEL);
 762         if (!pctl)
 763                 return -ENOMEM;
 764
 765         platform_set_drvdata(pdev, pctl);
 766
 767         pctl->dev = dev;
 768         pctl->match_data = match->data;
 769         ret = stm32_pctrl_build_state(pdev);
 770         if (ret) {
 771                 dev_err(dev, "build state failed: %d\n", ret);
 772                 return -EINVAL;
 773         }
 774
 775         for_each_child_of_node(np, child)
 776                 if (of_property_read_bool(child, "gpio-controller"))
 777                         banks++;
 778
 779         if (!banks) {
 780                 dev_err(dev, "at least one GPIO bank is required\n");
 781                 return -EINVAL;
 782         }
 783
 784         pctl->banks = devm_kcalloc(dev, banks, sizeof(*pctl->banks),
 785                         GFP_KERNEL);
 786         if (!pctl->banks)
 787                 return -ENOMEM;
 788
 789         for_each_child_of_node(np, child) {
 790                 if (of_property_read_bool(child, "gpio-controller")) {
 791                         ret = stm32_gpiolib_register_bank(pctl, child);
 792                         if (ret)
 793                                 return ret;
 794
 795                         pctl->nbanks++;
 796                 }
 797         }
 798
 799         pins = devm_kcalloc(&pdev->dev, pctl->match_data->npins, sizeof(*pins),
 800                             GFP_KERNEL);
 801         if (!pins)
 802                 return -ENOMEM;
 803
 804         for (i = 0; i < pctl->match_data->npins; i++)
 805                 pins[i] = pctl->match_data->pins[i].pin;
 806
 807         pctl->pctl_desc.name = dev_name(&pdev->dev);
 808         pctl->pctl_desc.owner = THIS_MODULE;
 809         pctl->pctl_desc.pins = pins;
 810         pctl->pctl_desc.npins = pctl->match_data->npins;
 811         pctl->pctl_desc.confops = &stm32_pconf_ops;
 812         pctl->pctl_desc.pctlops = &stm32_pctrl_ops;
 813         pctl->pctl_desc.pmxops = &stm32_pmx_ops;
 814         pctl->dev = &pdev->dev;
 815
 816         pctl->pctl_dev = pinctrl_register(&pctl->pctl_desc, &pdev->dev, pctl);
 817         if (!pctl->pctl_dev) {
 818                 dev_err(&pdev->dev, "Failed pinctrl registration\n");
 819                 return -EINVAL;
 820         }
 821
 822         for (i = 0; i < pctl->nbanks; i++)
 823                 pinctrl_add_gpio_range(pctl->pctl_dev, &pctl->banks[i].range);
 824
 825         dev_info(dev, "Pinctrl STM32 initialized\n");
 826
 827         return 0;
 828 }
 829