drivers/pinctrl/pinctrl-samsung.c

   1 /*
   2  * pin-controller/pin-mux/pin-config/gpio-driver for Samsung's SoC's.
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *              http://www.samsung.com
   6  * Copyright (c) 2012 Linaro Ltd
   7  *              http://www.linaro.org
   8  *
   9  * Author: Thomas Abraham <thomas.ab@samsung.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This driver implements the Samsung pinctrl driver. It supports setting up of
  17  * pinmux and pinconf configurations. The gpiolib interface is also included.
  18  * External interrupt (gpio and wakeup) support are not included in this driver
  19  * but provides extensions to which platform specific implementation of the gpio
  20  * and wakeup interrupts can be hooked to.
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/io.h>
  26 #include <linux/slab.h>
  27 #include <linux/err.h>
  28 #include <linux/gpio.h>
  29 #include <linux/irqdomain.h>
  30
  31 #include "core.h"
  32 #include "pinctrl-samsung.h"
  33
  34 #define GROUP_SUFFIX            "-grp"
  35 #define GSUFFIX_LEN             sizeof(GROUP_SUFFIX)
  36 #define FUNCTION_SUFFIX         "-mux"
  37 #define FSUFFIX_LEN             sizeof(FUNCTION_SUFFIX)
  38
  39 /* list of all possible config options supported */
  40 static struct pin_config {
  41         char            *prop_cfg;
  42         unsigned int    cfg_type;
  43 } pcfgs[] = {
  44         { "samsung,pin-pud", PINCFG_TYPE_PUD },
  45         { "samsung,pin-drv", PINCFG_TYPE_DRV },
  46         { "samsung,pin-con-pdn", PINCFG_TYPE_CON_PDN },
  47         { "samsung,pin-pud-pdn", PINCFG_TYPE_PUD_PDN },
  48 };
  49
  50 static unsigned int pin_base;
  51
  52 static inline struct samsung_pin_bank *gc_to_pin_bank(struct gpio_chip *gc)
  53 {
  54         return container_of(gc, struct samsung_pin_bank, gpio_chip);
  55 }
  56
  57 /* check if the selector is a valid pin group selector */
  58 static int samsung_get_group_count(struct pinctrl_dev *pctldev)
  59 {
  60         struct samsung_pinctrl_drv_data *drvdata;
  61
  62         drvdata = pinctrl_dev_get_drvdata(pctldev);
  63         return drvdata->nr_groups;
  64 }
  65
  66 /* return the name of the group selected by the group selector */
  67 static const char *samsung_get_group_name(struct pinctrl_dev *pctldev,
  68                                                 unsigned selector)
  69 {
  70         struct samsung_pinctrl_drv_data *drvdata;
  71
  72         drvdata = pinctrl_dev_get_drvdata(pctldev);
  73         return drvdata->pin_groups[selector].name;
  74 }
  75
  76 /* return the pin numbers associated with the specified group */
  77 static int samsung_get_group_pins(struct pinctrl_dev *pctldev,
  78                 unsigned selector, const unsigned **pins, unsigned *num_pins)
  79 {
  80         struct samsung_pinctrl_drv_data *drvdata;
  81
  82         drvdata = pinctrl_dev_get_drvdata(pctldev);
  83         *pins = drvdata->pin_groups[selector].pins;
  84         *num_pins = drvdata->pin_groups[selector].num_pins;
  85         return 0;
  86 }
  87
  88 /* create pinctrl_map entries by parsing device tree nodes */
  89 static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev,
  90                         struct device_node *np, struct pinctrl_map **maps,
  91                         unsigned *nmaps)
  92 {
  93         struct device *dev = pctldev->dev;
  94         struct pinctrl_map *map;
  95         unsigned long *cfg = NULL;
  96         char *gname, *fname;
  97         int cfg_cnt = 0, map_cnt = 0, idx = 0;
  98
  99         /* count the number of config options specfied in the node */
 100         for (idx = 0; idx < ARRAY_SIZE(pcfgs); idx++) {
 101                 if (of_find_property(np, pcfgs[idx].prop_cfg, NULL))
 102                         cfg_cnt++;
 103         }
 104
 105         /*
 106          * Find out the number of map entries to create. All the config options
 107          * can be accomadated into a single config map entry.
 108          */
 109         if (cfg_cnt)
 110                 map_cnt = 1;
 111         if (of_find_property(np, "samsung,pin-function", NULL))
 112                 map_cnt++;
 113         if (!map_cnt) {
 114                 dev_err(dev, "node %s does not have either config or function "
 115                                 "configurations\n", np->name);
 116                 return -EINVAL;
 117         }
 118
 119         /* Allocate memory for pin-map entries */
 120         map = kzalloc(sizeof(*map) * map_cnt, GFP_KERNEL);
 121         if (!map) {
 122                 dev_err(dev, "could not alloc memory for pin-maps\n");
 123                 return -ENOMEM;
 124         }
 125         *nmaps = 0;
 126
 127         /*
 128          * Allocate memory for pin group name. The pin group name is derived
 129          * from the node name from which these map entries are be created.
 130          */
 131         gname = kzalloc(strlen(np->name) + GSUFFIX_LEN, GFP_KERNEL);
 132         if (!gname) {
 133                 dev_err(dev, "failed to alloc memory for group name\n");
 134                 goto free_map;
 135         }
 136         sprintf(gname, "%s%s", np->name, GROUP_SUFFIX);
 137
 138         /*
 139          * don't have config options? then skip over to creating function
 140          * map entries.
 141          */
 142         if (!cfg_cnt)
 143                 goto skip_cfgs;
 144
 145         /* Allocate memory for config entries */
 146         cfg = kzalloc(sizeof(*cfg) * cfg_cnt, GFP_KERNEL);
 147         if (!cfg) {
 148                 dev_err(dev, "failed to alloc memory for configs\n");
 149                 goto free_gname;
 150         }
 151
 152         /* Prepare a list of config settings */
 153         for (idx = 0, cfg_cnt = 0; idx < ARRAY_SIZE(pcfgs); idx++) {
 154                 u32 value;
 155                 if (!of_property_read_u32(np, pcfgs[idx].prop_cfg, &value))
 156                         cfg[cfg_cnt++] =
 157                                 PINCFG_PACK(pcfgs[idx].cfg_type, value);
 158         }
 159
 160         /* create the config map entry */
 161         map[*nmaps].data.configs.group_or_pin = gname;
 162         map[*nmaps].data.configs.configs = cfg;
 163         map[*nmaps].data.configs.num_configs = cfg_cnt;
 164         map[*nmaps].type = PIN_MAP_TYPE_CONFIGS_GROUP;
 165         *nmaps += 1;
 166
 167 skip_cfgs:
 168         /* create the function map entry */
 169         if (of_find_property(np, "samsung,pin-function", NULL)) {
 170                 fname = kzalloc(strlen(np->name) + FSUFFIX_LEN, GFP_KERNEL);
 171                 if (!fname) {
 172                         dev_err(dev, "failed to alloc memory for func name\n");
 173                         goto free_cfg;
 174                 }
 175                 sprintf(fname, "%s%s", np->name, FUNCTION_SUFFIX);
 176
 177                 map[*nmaps].data.mux.group = gname;
 178                 map[*nmaps].data.mux.function = fname;
 179                 map[*nmaps].type = PIN_MAP_TYPE_MUX_GROUP;
 180                 *nmaps += 1;
 181         }
 182
 183         *maps = map;
 184         return 0;
 185
 186 free_cfg:
 187         kfree(cfg);
 188 free_gname:
 189         kfree(gname);
 190 free_map:
 191         kfree(map);
 192         return -ENOMEM;
 193 }
 194
 195 /* free the memory allocated to hold the pin-map table */
 196 static void samsung_dt_free_map(struct pinctrl_dev *pctldev,
 197                              struct pinctrl_map *map, unsigned num_maps)
 198 {
 199         int idx;
 200
 201         for (idx = 0; idx < num_maps; idx++) {
 202                 if (map[idx].type == PIN_MAP_TYPE_MUX_GROUP) {
 203                         kfree(map[idx].data.mux.function);
 204                         if (!idx)
 205                                 kfree(map[idx].data.mux.group);
 206                 } else if (map->type == PIN_MAP_TYPE_CONFIGS_GROUP) {
 207                         kfree(map[idx].data.configs.configs);
 208                         if (!idx)
 209                                 kfree(map[idx].data.configs.group_or_pin);
 210                 }
 211         };
 212
 213         kfree(map);
 214 }
 215
 216 /* list of pinctrl callbacks for the pinctrl core */
 217 static struct pinctrl_ops samsung_pctrl_ops = {
 218         .get_groups_count       = samsung_get_group_count,
 219         .get_group_name         = samsung_get_group_name,
 220         .get_group_pins         = samsung_get_group_pins,
 221         .dt_node_to_map         = samsung_dt_node_to_map,
 222         .dt_free_map            = samsung_dt_free_map,
 223 };
 224
 225 /* check if the selector is a valid pin function selector */
 226 static int samsung_get_functions_count(struct pinctrl_dev *pctldev)
 227 {
 228         struct samsung_pinctrl_drv_data *drvdata;
 229
 230         drvdata = pinctrl_dev_get_drvdata(pctldev);
 231         return drvdata->nr_functions;
 232 }
 233
 234 /* return the name of the pin function specified */
 235 static const char *samsung_pinmux_get_fname(struct pinctrl_dev *pctldev,
 236                                                 unsigned selector)
 237 {
 238         struct samsung_pinctrl_drv_data *drvdata;
 239
 240         drvdata = pinctrl_dev_get_drvdata(pctldev);
 241         return drvdata->pmx_functions[selector].name;
 242 }
 243
 244 /* return the groups associated for the specified function selector */
 245 static int samsung_pinmux_get_groups(struct pinctrl_dev *pctldev,
 246                 unsigned selector, const char * const **groups,
 247                 unsigned * const num_groups)
 248 {
 249         struct samsung_pinctrl_drv_data *drvdata;
 250
 251         drvdata = pinctrl_dev_get_drvdata(pctldev);
 252         *groups = drvdata->pmx_functions[selector].groups;
 253         *num_groups = drvdata->pmx_functions[selector].num_groups;
 254         return 0;
 255 }
 256
 257 /*
 258  * given a pin number that is local to a pin controller, find out the pin bank
 259  * and the register base of the pin bank.
 260  */
 261 static void pin_to_reg_bank(struct samsung_pinctrl_drv_data *drvdata,
 262                         unsigned pin, void __iomem **reg, u32 *offset,
 263                         struct samsung_pin_bank **bank)
 264 {
 265         struct samsung_pin_bank *b;
 266
 267         b = drvdata->ctrl->pin_banks;
 268
 269         while ((pin >= b->pin_base) &&
 270                         ((b->pin_base + b->nr_pins - 1) < pin))
 271                 b++;
 272
 273         *reg = drvdata->virt_base + b->pctl_offset;
 274         *offset = pin - b->pin_base;
 275         if (bank)
 276                 *bank = b;
 277
 278         /* some banks have two config registers in a single bank */
 279         if (*offset * b->func_width > BITS_PER_LONG)
 280                 *reg += 4;
 281 }
 282
 283 /* enable or disable a pinmux function */
 284 static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
 285                                         unsigned group, bool enable)
 286 {
 287         struct samsung_pinctrl_drv_data *drvdata;
 288         const unsigned int *pins;
 289         struct samsung_pin_bank *bank;
 290         void __iomem *reg;
 291         u32 mask, shift, data, pin_offset, cnt;
 292
 293         drvdata = pinctrl_dev_get_drvdata(pctldev);
 294         pins = drvdata->pin_groups[group].pins;
 295
 296         /*
 297          * for each pin in the pin group selected, program the correspoding pin
 298          * pin function number in the config register.
 299          */
 300         for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++) {
 301                 pin_to_reg_bank(drvdata, pins[cnt] - drvdata->ctrl->base,
 302                                 &reg, &pin_offset, &bank);
 303                 mask = (1 << bank->func_width) - 1;
 304                 shift = pin_offset * bank->func_width;
 305
 306                 data = readl(reg);
 307                 data &= ~(mask << shift);
 308                 if (enable)
 309                         data |= drvdata->pin_groups[group].func << shift;
 310                 writel(data, reg);
 311         }
 312 }
 313
 314 /* enable a specified pinmux by writing to registers */
 315 static int samsung_pinmux_enable(struct pinctrl_dev *pctldev, unsigned selector,
 316                                         unsigned group)
 317 {
 318         samsung_pinmux_setup(pctldev, selector, group, true);
 319         return 0;
 320 }
 321
 322 /* disable a specified pinmux by writing to registers */
 323 static void samsung_pinmux_disable(struct pinctrl_dev *pctldev,
 324                                         unsigned selector, unsigned group)
 325 {
 326         samsung_pinmux_setup(pctldev, selector, group, false);
 327 }
 328
 329 /*
 330  * The calls to gpio_direction_output() and gpio_direction_input()
 331  * leads to this function call (via the pinctrl_gpio_direction_{input|output}()
 332  * function called from the gpiolib interface).
 333  */
 334 static int samsung_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
 335                 struct pinctrl_gpio_range *range, unsigned offset, bool input)
 336 {
 337         struct samsung_pin_bank *bank;
 338         struct samsung_pinctrl_drv_data *drvdata;
 339         void __iomem *reg;
 340         u32 data, pin_offset, mask, shift;
 341
 342         bank = gc_to_pin_bank(range->gc);
 343         drvdata = pinctrl_dev_get_drvdata(pctldev);
 344
 345         pin_offset = offset - bank->pin_base;
 346         reg = drvdata->virt_base + bank->pctl_offset;
 347
 348         mask = (1 << bank->func_width) - 1;
 349         shift = pin_offset * bank->func_width;
 350
 351         data = readl(reg);
 352         data &= ~(mask << shift);
 353         if (!input)
 354                 data |= FUNC_OUTPUT << shift;
 355         writel(data, reg);
 356         return 0;
 357 }
 358
 359 /* list of pinmux callbacks for the pinmux vertical in pinctrl core */
 360 static struct pinmux_ops samsung_pinmux_ops = {
 361         .get_functions_count    = samsung_get_functions_count,
 362         .get_function_name      = samsung_pinmux_get_fname,
 363         .get_function_groups    = samsung_pinmux_get_groups,
 364         .enable                 = samsung_pinmux_enable,
 365         .disable                = samsung_pinmux_disable,
 366         .gpio_set_direction     = samsung_pinmux_gpio_set_direction,
 367 };
 368
 369 /* set or get the pin config settings for a specified pin */
 370 static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
 371                                 unsigned long *config, bool set)
 372 {
 373         struct samsung_pinctrl_drv_data *drvdata;
 374         struct samsung_pin_bank *bank;
 375         void __iomem *reg_base;
 376         enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config);
 377         u32 data, width, pin_offset, mask, shift;
 378         u32 cfg_value, cfg_reg;
 379
 380         drvdata = pinctrl_dev_get_drvdata(pctldev);
 381         pin_to_reg_bank(drvdata, pin - drvdata->ctrl->base, &reg_base,
 382                                         &pin_offset, &bank);
 383
 384         switch (cfg_type) {
 385         case PINCFG_TYPE_PUD:
 386                 width = bank->pud_width;
 387                 cfg_reg = PUD_REG;
 388                 break;
 389         case PINCFG_TYPE_DRV:
 390                 width = bank->drv_width;
 391                 cfg_reg = DRV_REG;
 392                 break;
 393         case PINCFG_TYPE_CON_PDN:
 394                 width = bank->conpdn_width;
 395                 cfg_reg = CONPDN_REG;
 396                 break;
 397         case PINCFG_TYPE_PUD_PDN:
 398                 width = bank->pudpdn_width;
 399                 cfg_reg = PUDPDN_REG;
 400                 break;
 401         default:
 402                 WARN_ON(1);
 403                 return -EINVAL;
 404         }
 405
 406         if (!width)
 407                 return -EINVAL;
 408
 409         mask = (1 << width) - 1;
 410         shift = pin_offset * width;
 411         data = readl(reg_base + cfg_reg);
 412
 413         if (set) {
 414                 cfg_value = PINCFG_UNPACK_VALUE(*config);
 415                 data &= ~(mask << shift);
 416                 data |= (cfg_value << shift);
 417                 writel(data, reg_base + cfg_reg);
 418         } else {
 419                 data >>= shift;
 420                 data &= mask;
 421                 *config = PINCFG_PACK(cfg_type, data);
 422         }
 423         return 0;
 424 }
 425
 426 /* set the pin config settings for a specified pin */
 427 static int samsung_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
 428                                 unsigned long config)
 429 {
 430         return samsung_pinconf_rw(pctldev, pin, &config, true);
 431 }
 432
 433 /* get the pin config settings for a specified pin */
 434 static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
 435                                         unsigned long *config)
 436 {
 437         return samsung_pinconf_rw(pctldev, pin, config, false);
 438 }
 439
 440 /* set the pin config settings for a specified pin group */
 441 static int samsung_pinconf_group_set(struct pinctrl_dev *pctldev,
 442                         unsigned group, unsigned long config)
 443 {
 444         struct samsung_pinctrl_drv_data *drvdata;
 445         const unsigned int *pins;
 446         unsigned int cnt;
 447
 448         drvdata = pinctrl_dev_get_drvdata(pctldev);
 449         pins = drvdata->pin_groups[group].pins;
 450
 451         for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++)
 452                 samsung_pinconf_set(pctldev, pins[cnt], config);
 453
 454         return 0;
 455 }
 456
 457 /* get the pin config settings for a specified pin group */
 458 static int samsung_pinconf_group_get(struct pinctrl_dev *pctldev,
 459                                 unsigned int group, unsigned long *config)
 460 {
 461         struct samsung_pinctrl_drv_data *drvdata;
 462         const unsigned int *pins;
 463
 464         drvdata = pinctrl_dev_get_drvdata(pctldev);
 465         pins = drvdata->pin_groups[group].pins;
 466         samsung_pinconf_get(pctldev, pins[0], config);
 467         return 0;
 468 }
 469
 470 /* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */
 471 static struct pinconf_ops samsung_pinconf_ops = {
 472         .pin_config_get         = samsung_pinconf_get,
 473         .pin_config_set         = samsung_pinconf_set,
 474         .pin_config_group_get   = samsung_pinconf_group_get,
 475         .pin_config_group_set   = samsung_pinconf_group_set,
 476 };
 477
 478 /* gpiolib gpio_set callback function */
 479 static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
 480 {
 481         struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
 482         void __iomem *reg;
 483         u32 data;
 484
 485         reg = bank->drvdata->virt_base + bank->pctl_offset;
 486
 487         data = readl(reg + DAT_REG);
 488         data &= ~(1 << offset);
 489         if (value)
 490                 data |= 1 << offset;
 491         writel(data, reg + DAT_REG);
 492 }
 493
 494 /* gpiolib gpio_get callback function */
 495 static int samsung_gpio_get(struct gpio_chip *gc, unsigned offset)
 496 {
 497         void __iomem *reg;
 498         u32 data;
 499         struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
 500
 501         reg = bank->drvdata->virt_base + bank->pctl_offset;
 502
 503         data = readl(reg + DAT_REG);
 504         data >>= offset;
 505         data &= 1;
 506         return data;
 507 }
 508
 509 /*
 510  * gpiolib gpio_direction_input callback function. The setting of the pin
 511  * mux function as 'gpio input' will be handled by the pinctrl susbsystem
 512  * interface.
 513  */
 514 static int samsung_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
 515 {
 516         return pinctrl_gpio_direction_input(gc->base + offset);
 517 }
 518
 519 /*
 520  * gpiolib gpio_direction_output callback function. The setting of the pin
 521  * mux function as 'gpio output' will be handled by the pinctrl susbsystem
 522  * interface.
 523  */
 524 static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
 525                                                         int value)
 526 {
 527         samsung_gpio_set(gc, offset, value);
 528         return pinctrl_gpio_direction_output(gc->base + offset);
 529 }
 530
 531 /*
 532  * gpiolib gpio_to_irq callback function. Creates a mapping between a GPIO pin
 533  * and a virtual IRQ, if not already present.
 534  */
 535 static int samsung_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
 536 {
 537         struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
 538         unsigned int virq;
 539
 540         if (!bank->irq_domain)
 541                 return -ENXIO;
 542
 543         virq = irq_create_mapping(bank->irq_domain, offset);
 544
 545         return (virq) ? : -ENXIO;
 546 }
 547
 548 /*
 549  * Parse the pin names listed in the 'samsung,pins' property and convert it
 550  * into a list of gpio numbers are create a pin group from it.
 551  */
 552 static int samsung_pinctrl_parse_dt_pins(struct platform_device *pdev,
 553                                          struct device_node *cfg_np,
 554                                          struct pinctrl_desc *pctl,
 555                                          unsigned int **pin_list,
 556                                          unsigned int *npins)
 557 {
 558         struct device *dev = &pdev->dev;
 559         struct property *prop;
 560         struct pinctrl_pin_desc const *pdesc = pctl->pins;
 561         unsigned int idx = 0, cnt;
 562         const char *pin_name;
 563
 564         *npins = of_property_count_strings(cfg_np, "samsung,pins");
 565         if (IS_ERR_VALUE(*npins)) {
 566                 dev_err(dev, "invalid pin list in %s node", cfg_np->name);
 567                 return -EINVAL;
 568         }
 569
 570         *pin_list = devm_kzalloc(dev, *npins * sizeof(**pin_list), GFP_KERNEL);
 571         if (!*pin_list) {
 572                 dev_err(dev, "failed to allocate memory for pin list\n");
 573                 return -ENOMEM;
 574         }
 575
 576         of_property_for_each_string(cfg_np, "samsung,pins", prop, pin_name) {
 577                 for (cnt = 0; cnt < pctl->npins; cnt++) {
 578                         if (pdesc[cnt].name) {
 579                                 if (!strcmp(pin_name, pdesc[cnt].name)) {
 580                                         (*pin_list)[idx++] = pdesc[cnt].number;
 581                                         break;
 582                                 }
 583                         }
 584                 }
 585                 if (cnt == pctl->npins) {
 586                         dev_err(dev, "pin %s not valid in %s node\n",
 587                                         pin_name, cfg_np->name);
 588                         devm_kfree(dev, *pin_list);
 589                         return -EINVAL;
 590                 }
 591         }
 592
 593         return 0;
 594 }
 595
 596 /*
 597  * Parse the information about all the available pin groups and pin functions
 598  * from device node of the pin-controller. A pin group is formed with all
 599  * the pins listed in the "samsung,pins" property.
 600  */
 601 static int samsung_pinctrl_parse_dt(struct platform_device *pdev,
 602                                     struct samsung_pinctrl_drv_data *drvdata)
 603 {
 604         struct device *dev = &pdev->dev;
 605         struct device_node *dev_np = dev->of_node;
 606         struct device_node *cfg_np;
 607         struct samsung_pin_group *groups, *grp;
 608         struct samsung_pmx_func *functions, *func;
 609         unsigned *pin_list;
 610         unsigned int npins, grp_cnt, func_idx = 0;
 611         char *gname, *fname;
 612         int ret;
 613
 614         grp_cnt = of_get_child_count(dev_np);
 615         if (!grp_cnt)
 616                 return -EINVAL;
 617
 618         groups = devm_kzalloc(dev, grp_cnt * sizeof(*groups), GFP_KERNEL);
 619         if (!groups) {
 620                 dev_err(dev, "failed allocate memory for ping group list\n");
 621                 return -EINVAL;
 622         }
 623         grp = groups;
 624
 625         functions = devm_kzalloc(dev, grp_cnt * sizeof(*functions), GFP_KERNEL);
 626         if (!functions) {
 627                 dev_err(dev, "failed to allocate memory for function list\n");
 628                 return -EINVAL;
 629         }
 630         func = functions;
 631
 632         /*
 633          * Iterate over all the child nodes of the pin controller node
 634          * and create pin groups and pin function lists.
 635          */
 636         for_each_child_of_node(dev_np, cfg_np) {
 637                 u32 function;
 638                 if (!of_find_property(cfg_np, "samsung,pins", NULL))
 639                         continue;
 640
 641                 ret = samsung_pinctrl_parse_dt_pins(pdev, cfg_np,
 642                                         &drvdata->pctl, &pin_list, &npins);
 643                 if (ret)
 644                         return ret;
 645
 646                 /* derive pin group name from the node name */
 647                 gname = devm_kzalloc(dev, strlen(cfg_np->name) + GSUFFIX_LEN,
 648                                         GFP_KERNEL);
 649                 if (!gname) {
 650                         dev_err(dev, "failed to alloc memory for group name\n");
 651                         return -ENOMEM;
 652                 }
 653                 sprintf(gname, "%s%s", cfg_np->name, GROUP_SUFFIX);
 654
 655                 grp->name = gname;
 656                 grp->pins = pin_list;
 657                 grp->num_pins = npins;
 658                 of_property_read_u32(cfg_np, "samsung,pin-function", &function);
 659                 grp->func = function;
 660                 grp++;
 661
 662                 if (!of_find_property(cfg_np, "samsung,pin-function", NULL))
 663                         continue;
 664
 665                 /* derive function name from the node name */
 666                 fname = devm_kzalloc(dev, strlen(cfg_np->name) + FSUFFIX_LEN,
 667                                         GFP_KERNEL);
 668                 if (!fname) {
 669                         dev_err(dev, "failed to alloc memory for func name\n");
 670                         return -ENOMEM;
 671                 }
 672                 sprintf(fname, "%s%s", cfg_np->name, FUNCTION_SUFFIX);
 673
 674                 func->name = fname;
 675                 func->groups = devm_kzalloc(dev, sizeof(char *), GFP_KERNEL);
 676                 if (!func->groups) {
 677                         dev_err(dev, "failed to alloc memory for group list "
 678                                         "in pin function");
 679                         return -ENOMEM;
 680                 }
 681                 func->groups[0] = gname;
 682                 func->num_groups = 1;
 683                 func++;
 684                 func_idx++;
 685         }
 686
 687         drvdata->pin_groups = groups;
 688         drvdata->nr_groups = grp_cnt;
 689         drvdata->pmx_functions = functions;
 690         drvdata->nr_functions = func_idx;
 691
 692         return 0;
 693 }
 694
 695 /* register the pinctrl interface with the pinctrl subsystem */
 696 static int samsung_pinctrl_register(struct platform_device *pdev,
 697                                     struct samsung_pinctrl_drv_data *drvdata)
 698 {
 699         struct pinctrl_desc *ctrldesc = &drvdata->pctl;
 700         struct pinctrl_pin_desc *pindesc, *pdesc;
 701         struct samsung_pin_bank *pin_bank;
 702         char *pin_names;
 703         int pin, bank, ret;
 704
 705         ctrldesc->name = "samsung-pinctrl";
 706         ctrldesc->owner = THIS_MODULE;
 707         ctrldesc->pctlops = &samsung_pctrl_ops;
 708         ctrldesc->pmxops = &samsung_pinmux_ops;
 709         ctrldesc->confops = &samsung_pinconf_ops;
 710
 711         pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) *
 712                         drvdata->ctrl->nr_pins, GFP_KERNEL);
 713         if (!pindesc) {
 714                 dev_err(&pdev->dev, "mem alloc for pin descriptors failed\n");
 715                 return -ENOMEM;
 716         }
 717         ctrldesc->pins = pindesc;
 718         ctrldesc->npins = drvdata->ctrl->nr_pins;
 719         ctrldesc->npins = drvdata->ctrl->nr_pins;
 720
 721         /* dynamically populate the pin number and pin name for pindesc */
 722         for (pin = 0, pdesc = pindesc; pin < ctrldesc->npins; pin++, pdesc++)
 723                 pdesc->number = pin + drvdata->ctrl->base;
 724
 725         /*
 726          * allocate space for storing the dynamically generated names for all
 727          * the pins which belong to this pin-controller.
 728          */
 729         pin_names = devm_kzalloc(&pdev->dev, sizeof(char) * PIN_NAME_LENGTH *
 730                                         drvdata->ctrl->nr_pins, GFP_KERNEL);
 731         if (!pin_names) {
 732                 dev_err(&pdev->dev, "mem alloc for pin names failed\n");
 733                 return -ENOMEM;
 734         }
 735
 736         /* for each pin, the name of the pin is pin-bank name + pin number */
 737         for (bank = 0; bank < drvdata->ctrl->nr_banks; bank++) {
 738                 pin_bank = &drvdata->ctrl->pin_banks[bank];
 739                 for (pin = 0; pin < pin_bank->nr_pins; pin++) {
 740                         sprintf(pin_names, "%s-%d", pin_bank->name, pin);
 741                         pdesc = pindesc + pin_bank->pin_base + pin;
 742                         pdesc->name = pin_names;
 743                         pin_names += PIN_NAME_LENGTH;
 744                 }
 745         }
 746
 747         drvdata->pctl_dev = pinctrl_register(ctrldesc, &pdev->dev, drvdata);
 748         if (!drvdata->pctl_dev) {
 749                 dev_err(&pdev->dev, "could not register pinctrl driver\n");
 750                 return -EINVAL;
 751         }
 752
 753         for (bank = 0; bank < drvdata->ctrl->nr_banks; ++bank) {
 754                 pin_bank = &drvdata->ctrl->pin_banks[bank];
 755                 pin_bank->grange.name = pin_bank->name;
 756                 pin_bank->grange.id = bank;
 757                 pin_bank->grange.pin_base = pin_bank->pin_base;
 758                 pin_bank->grange.base = pin_bank->gpio_chip.base;
 759                 pin_bank->grange.npins = pin_bank->gpio_chip.ngpio;
 760                 pin_bank->grange.gc = &pin_bank->gpio_chip;
 761                 pinctrl_add_gpio_range(drvdata->pctl_dev, &pin_bank->grange);
 762         }
 763
 764         ret = samsung_pinctrl_parse_dt(pdev, drvdata);
 765         if (ret) {
 766                 pinctrl_unregister(drvdata->pctl_dev);
 767                 return ret;
 768         }
 769
 770         return 0;
 771 }
 772
 773 static const struct gpio_chip samsung_gpiolib_chip = {
 774         .set = samsung_gpio_set,
 775         .get = samsung_gpio_get,
 776         .direction_input = samsung_gpio_direction_input,
 777         .direction_output = samsung_gpio_direction_output,
 778         .to_irq = samsung_gpio_to_irq,
 779         .owner = THIS_MODULE,
 780 };
 781
 782 /* register the gpiolib interface with the gpiolib subsystem */
 783 static int samsung_gpiolib_register(struct platform_device *pdev,
 784                                     struct samsung_pinctrl_drv_data *drvdata)
 785 {
 786         struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
 787         struct samsung_pin_bank *bank = ctrl->pin_banks;
 788         struct gpio_chip *gc;
 789         int ret;
 790         int i;
 791
 792         for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
 793                 bank->gpio_chip = samsung_gpiolib_chip;
 794
 795                 gc = &bank->gpio_chip;
 796                 gc->base = ctrl->base + bank->pin_base;
 797                 gc->ngpio = bank->nr_pins;
 798                 gc->dev = &pdev->dev;
 799                 gc->of_node = bank->of_node;
 800                 gc->label = bank->name;
 801
 802                 ret = gpiochip_add(gc);
 803                 if (ret) {
 804                         dev_err(&pdev->dev, "failed to register gpio_chip %s, error code: %d\n",
 805                                                         gc->label, ret);
 806                         goto fail;
 807                 }
 808         }
 809
 810         return 0;
 811
 812 fail:
 813         for (--i, --bank; i >= 0; --i, --bank)
 814                 if (gpiochip_remove(&bank->gpio_chip))
 815                         dev_err(&pdev->dev, "gpio chip %s remove failed\n",
 816                                                         bank->gpio_chip.label);
 817         return ret;
 818 }
 819
 820 /* unregister the gpiolib interface with the gpiolib subsystem */
 821 static int samsung_gpiolib_unregister(struct platform_device *pdev,
 822                                       struct samsung_pinctrl_drv_data *drvdata)
 823 {
 824         struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
 825         struct samsung_pin_bank *bank = ctrl->pin_banks;
 826         int ret = 0;
 827         int i;
 828
 829         for (i = 0; !ret && i < ctrl->nr_banks; ++i, ++bank)
 830                 ret = gpiochip_remove(&bank->gpio_chip);
 831
 832         if (ret)
 833                 dev_err(&pdev->dev, "gpio chip remove failed\n");
 834
 835         return ret;
 836 }
 837
 838 static const struct of_device_id samsung_pinctrl_dt_match[];
 839
 840 /* retrieve the soc specific data */
 841 static struct samsung_pin_ctrl *samsung_pinctrl_get_soc_data(
 842                                 struct samsung_pinctrl_drv_data *d,
 843                                 struct platform_device *pdev)
 844 {
 845         int id;
 846         const struct of_device_id *match;
 847         struct device_node *node = pdev->dev.of_node;
 848         struct device_node *np;
 849         struct samsung_pin_ctrl *ctrl;
 850         struct samsung_pin_bank *bank;
 851         int i;
 852
 853         id = of_alias_get_id(node, "pinctrl");
 854         if (id < 0) {
 855                 dev_err(&pdev->dev, "failed to get alias id\n");
 856                 return NULL;
 857         }
 858         match = of_match_node(samsung_pinctrl_dt_match, node);
 859         ctrl = (struct samsung_pin_ctrl *)match->data + id;
 860
 861         bank = ctrl->pin_banks;
 862         for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
 863                 bank->drvdata = d;
 864                 bank->pin_base = ctrl->nr_pins;
 865                 ctrl->nr_pins += bank->nr_pins;
 866         }
 867
 868         for_each_child_of_node(node, np) {
 869                 if (!of_find_property(np, "gpio-controller", NULL))
 870                         continue;
 871                 bank = ctrl->pin_banks;
 872                 for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
 873                         if (!strcmp(bank->name, np->name)) {
 874                                 bank->of_node = np;
 875                                 break;
 876                         }
 877                 }
 878         }
 879
 880         ctrl->base = pin_base;
 881         pin_base += ctrl->nr_pins;
 882
 883         return ctrl;
 884 }
 885
 886 static int samsung_pinctrl_probe(struct platform_device *pdev)
 887 {
 888         struct samsung_pinctrl_drv_data *drvdata;
 889         struct device *dev = &pdev->dev;
 890         struct samsung_pin_ctrl *ctrl;
 891         struct resource *res;
 892         int ret;
 893
 894         if (!dev->of_node) {
 895                 dev_err(dev, "device tree node not found\n");
 896                 return -ENODEV;
 897         }
 898
 899         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 900         if (!drvdata) {
 901                 dev_err(dev, "failed to allocate memory for driver's "
 902                                 "private data\n");
 903                 return -ENOMEM;
 904         }
 905
 906         ctrl = samsung_pinctrl_get_soc_data(drvdata, pdev);
 907         if (!ctrl) {
 908                 dev_err(&pdev->dev, "driver data not available\n");
 909                 return -EINVAL;
 910         }
 911         drvdata->ctrl = ctrl;
 912         drvdata->dev = dev;
 913
 914         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 915         if (!res) {
 916                 dev_err(dev, "cannot find IO resource\n");
 917                 return -ENOENT;
 918         }
 919
 920         drvdata->virt_base = devm_request_and_ioremap(&pdev->dev, res);
 921         if (!drvdata->virt_base) {
 922                 dev_err(dev, "ioremap failed\n");
 923                 return -ENODEV;
 924         }
 925
 926         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 927         if (res)
 928                 drvdata->irq = res->start;
 929
 930         ret = samsung_gpiolib_register(pdev, drvdata);
 931         if (ret)
 932                 return ret;
 933
 934         ret = samsung_pinctrl_register(pdev, drvdata);
 935         if (ret) {
 936                 samsung_gpiolib_unregister(pdev, drvdata);
 937                 return ret;
 938         }
 939
 940         if (ctrl->eint_gpio_init)
 941                 ctrl->eint_gpio_init(drvdata);
 942         if (ctrl->eint_wkup_init)
 943                 ctrl->eint_wkup_init(drvdata);
 944
 945         platform_set_drvdata(pdev, drvdata);
 946         return 0;
 947 }
 948
 949 static const struct of_device_id samsung_pinctrl_dt_match[] = {
 950         { .compatible = "samsung,pinctrl-exynos4210",
 951                 .data = (void *)exynos4210_pin_ctrl },
 952         { .compatible = "samsung,pinctrl-exynos4x12",
 953                 .data = (void *)exynos4x12_pin_ctrl },
 954         {},
 955 };
 956 MODULE_DEVICE_TABLE(of, samsung_pinctrl_dt_match);
 957
 958 static struct platform_driver samsung_pinctrl_driver = {
 959         .probe          = samsung_pinctrl_probe,
 960         .driver = {
 961                 .name   = "samsung-pinctrl",
 962                 .owner  = THIS_MODULE,
 963                 .of_match_table = of_match_ptr(samsung_pinctrl_dt_match),
 964         },
 965 };
 966
 967 static int __init samsung_pinctrl_drv_register(void)
 968 {
 969         return platform_driver_register(&samsung_pinctrl_driver);
 970 }
 971 postcore_initcall(samsung_pinctrl_drv_register);
 972
 973 static void __exit samsung_pinctrl_drv_unregister(void)
 974 {
 975         platform_driver_unregister(&samsung_pinctrl_driver);
 976 }
 977 module_exit(samsung_pinctrl_drv_unregister);
 978
 979 MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");
 980 MODULE_DESCRIPTION("Samsung pinctrl driver");
 981 MODULE_LICENSE("GPL v2");