drivers/pinctrl/mvebu/pinctrl-mvebu.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Marvell MVEBU pinctrl core driver
   4  *
   5  * Authors: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
   6  *          Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
   7  */
   8
   9 #include <linux/err.h>
  10 #include <linux/gpio/driver.h>
  11 #include <linux/io.h>
  12 #include <linux/mfd/syscon.h>
  13 #include <linux/of.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/regmap.h>
  16 #include <linux/seq_file.h>
  17 #include <linux/slab.h>
  18
  19 #include <linux/pinctrl/machine.h>
  20 #include <linux/pinctrl/pinconf.h>
  21 #include <linux/pinctrl/pinctrl.h>
  22 #include <linux/pinctrl/pinmux.h>
  23
  24 #include "pinctrl-mvebu.h"
  25
  26 #define MPPS_PER_REG    8
  27 #define MPP_BITS        4
  28 #define MPP_MASK        0xf
  29
  30 struct mvebu_pinctrl_function {
  31         const char *name;
  32         const char **groups;
  33         unsigned num_groups;
  34 };
  35
  36 struct mvebu_pinctrl_group {
  37         const char *name;
  38         const struct mvebu_mpp_ctrl *ctrl;
  39         struct mvebu_mpp_ctrl_data *data;
  40         struct mvebu_mpp_ctrl_setting *settings;
  41         unsigned num_settings;
  42         unsigned gid;
  43         unsigned *pins;
  44         unsigned npins;
  45 };
  46
  47 struct mvebu_pinctrl {
  48         struct device *dev;
  49         struct pinctrl_dev *pctldev;
  50         struct pinctrl_desc desc;
  51         struct mvebu_pinctrl_group *groups;
  52         unsigned num_groups;
  53         struct mvebu_pinctrl_function *functions;
  54         unsigned num_functions;
  55         u8 variant;
  56 };
  57
  58 int mvebu_mmio_mpp_ctrl_get(struct mvebu_mpp_ctrl_data *data,
  59                              unsigned int pid, unsigned long *config)
  60 {
  61         unsigned off = (pid / MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
  62         unsigned shift = (pid % MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
  63
  64         *config = (readl(data->base + off) >> shift) & MVEBU_MPP_MASK;
  65
  66         return 0;
  67 }
  68
  69 int mvebu_mmio_mpp_ctrl_set(struct mvebu_mpp_ctrl_data *data,
  70                              unsigned int pid, unsigned long config)
  71 {
  72         unsigned off = (pid / MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
  73         unsigned shift = (pid % MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
  74         unsigned long reg;
  75
  76         reg = readl(data->base + off) & ~(MVEBU_MPP_MASK << shift);
  77         writel(reg | (config << shift), data->base + off);
  78
  79         return 0;
  80 }
  81
  82 static struct mvebu_pinctrl_group *mvebu_pinctrl_find_group_by_pid(
  83         struct mvebu_pinctrl *pctl, unsigned pid)
  84 {
  85         unsigned n;
  86         for (n = 0; n < pctl->num_groups; n++) {
  87                 if (pid >= pctl->groups[n].pins[0] &&
  88                     pid < pctl->groups[n].pins[0] +
  89                         pctl->groups[n].npins)
  90                         return &pctl->groups[n];
  91         }
  92         return NULL;
  93 }
  94
  95 static struct mvebu_pinctrl_group *mvebu_pinctrl_find_group_by_name(
  96         struct mvebu_pinctrl *pctl, const char *name)
  97 {
  98         unsigned n;
  99
 100         for (n = 0; n < pctl->num_groups; n++) {
 101                 if (strcmp(name, pctl->groups[n].name) == 0)
 102                         return &pctl->groups[n];
 103         }
 104
 105         return NULL;
 106 }
 107
 108 static struct mvebu_mpp_ctrl_setting *mvebu_pinctrl_find_setting_by_val(
 109         struct mvebu_pinctrl *pctl, struct mvebu_pinctrl_group *grp,
 110         unsigned long config)
 111 {
 112         unsigned n;
 113
 114         for (n = 0; n < grp->num_settings; n++) {
 115                 if (config == grp->settings[n].val) {
 116                         if (!pctl->variant || (pctl->variant &
 117                                                grp->settings[n].variant))
 118                                 return &grp->settings[n];
 119                 }
 120         }
 121
 122         return NULL;
 123 }
 124
 125 static struct mvebu_mpp_ctrl_setting *mvebu_pinctrl_find_setting_by_name(
 126         struct mvebu_pinctrl *pctl, struct mvebu_pinctrl_group *grp,
 127         const char *name)
 128 {
 129         unsigned n;
 130
 131         for (n = 0; n < grp->num_settings; n++) {
 132                 if (strcmp(name, grp->settings[n].name) == 0) {
 133                         if (!pctl->variant || (pctl->variant &
 134                                                grp->settings[n].variant))
 135                                 return &grp->settings[n];
 136                 }
 137         }
 138
 139         return NULL;
 140 }
 141
 142 static struct mvebu_mpp_ctrl_setting *mvebu_pinctrl_find_gpio_setting(
 143         struct mvebu_pinctrl *pctl, struct mvebu_pinctrl_group *grp)
 144 {
 145         unsigned n;
 146
 147         for (n = 0; n < grp->num_settings; n++) {
 148                 if (grp->settings[n].flags &
 149                         (MVEBU_SETTING_GPO | MVEBU_SETTING_GPI)) {
 150                         if (!pctl->variant || (pctl->variant &
 151                                                 grp->settings[n].variant))
 152                                 return &grp->settings[n];
 153                 }
 154         }
 155
 156         return NULL;
 157 }
 158
 159 static struct mvebu_pinctrl_function *mvebu_pinctrl_find_function_by_name(
 160         struct mvebu_pinctrl *pctl, const char *name)
 161 {
 162         unsigned n;
 163
 164         for (n = 0; n < pctl->num_functions; n++) {
 165                 if (strcmp(name, pctl->functions[n].name) == 0)
 166                         return &pctl->functions[n];
 167         }
 168
 169         return NULL;
 170 }
 171
 172 static int mvebu_pinconf_group_get(struct pinctrl_dev *pctldev,
 173                                 unsigned gid, unsigned long *config)
 174 {
 175         struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 176         struct mvebu_pinctrl_group *grp = &pctl->groups[gid];
 177
 178         if (!grp->ctrl)
 179                 return -EINVAL;
 180
 181         return grp->ctrl->mpp_get(grp->data, grp->pins[0], config);
 182 }
 183
 184 static int mvebu_pinconf_group_set(struct pinctrl_dev *pctldev,
 185                                 unsigned gid, unsigned long *configs,
 186                                 unsigned num_configs)
 187 {
 188         struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 189         struct mvebu_pinctrl_group *grp = &pctl->groups[gid];
 190         int i, ret;
 191
 192         if (!grp->ctrl)
 193                 return -EINVAL;
 194
 195         for (i = 0; i < num_configs; i++) {
 196                 ret = grp->ctrl->mpp_set(grp->data, grp->pins[0], configs[i]);
 197                 if (ret)
 198                         return ret;
 199         } /* for each config */
 200
 201         return 0;
 202 }
 203
 204 static void mvebu_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
 205                                         struct seq_file *s, unsigned gid)
 206 {
 207         struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 208         struct mvebu_pinctrl_group *grp = &pctl->groups[gid];
 209         struct mvebu_mpp_ctrl_setting *curr;
 210         unsigned long config;
 211         unsigned n;
 212
 213         if (mvebu_pinconf_group_get(pctldev, gid, &config))
 214                 return;
 215
 216         curr = mvebu_pinctrl_find_setting_by_val(pctl, grp, config);
 217
 218         if (curr) {
 219                 seq_printf(s, "current: %s", curr->name);
 220                 if (curr->subname)
 221                         seq_printf(s, "(%s)", curr->subname);
 222                 if (curr->flags & (MVEBU_SETTING_GPO | MVEBU_SETTING_GPI)) {
 223                         seq_putc(s, '(');
 224                         if (curr->flags & MVEBU_SETTING_GPI)
 225                                 seq_putc(s, 'i');
 226                         if (curr->flags & MVEBU_SETTING_GPO)
 227                                 seq_putc(s, 'o');
 228                         seq_putc(s, ')');
 229                 }
 230         } else {
 231                 seq_puts(s, "current: UNKNOWN");
 232         }
 233
 234         if (grp->num_settings > 1) {
 235                 seq_puts(s, ", available = [");
 236                 for (n = 0; n < grp->num_settings; n++) {
 237                         if (curr == &grp->settings[n])
 238                                 continue;
 239
 240                         /* skip unsupported settings for this variant */
 241                         if (pctl->variant &&
 242                             !(pctl->variant & grp->settings[n].variant))
 243                                 continue;
 244
 245                         seq_printf(s, " %s", grp->settings[n].name);
 246                         if (grp->settings[n].subname)
 247                                 seq_printf(s, "(%s)", grp->settings[n].subname);
 248                         if (grp->settings[n].flags &
 249                                 (MVEBU_SETTING_GPO | MVEBU_SETTING_GPI)) {
 250                                 seq_putc(s, '(');
 251                                 if (grp->settings[n].flags & MVEBU_SETTING_GPI)
 252                                         seq_putc(s, 'i');
 253                                 if (grp->settings[n].flags & MVEBU_SETTING_GPO)
 254                                         seq_putc(s, 'o');
 255                                 seq_putc(s, ')');
 256                         }
 257                 }
 258                 seq_puts(s, " ]");
 259         }
 260 }
 261
 262 static const struct pinconf_ops mvebu_pinconf_ops = {
 263         .pin_config_group_get = mvebu_pinconf_group_get,
 264         .pin_config_group_set = mvebu_pinconf_group_set,
 265         .pin_config_group_dbg_show = mvebu_pinconf_group_dbg_show,
 266 };
 267
 268 static int mvebu_pinmux_get_funcs_count(struct pinctrl_dev *pctldev)
 269 {
 270         struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 271
 272         return pctl->num_functions;
 273 }
 274
 275 static const char *mvebu_pinmux_get_func_name(struct pinctrl_dev *pctldev,
 276                                         unsigned fid)
 277 {
 278         struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 279
 280         return pctl->functions[fid].name;
 281 }
 282
 283 static int mvebu_pinmux_get_groups(struct pinctrl_dev *pctldev, unsigned fid,
 284                                 const char * const **groups,
 285                                 unsigned * const num_groups)
 286 {
 287         struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 288
 289         *groups = pctl->functions[fid].groups;
 290         *num_groups = pctl->functions[fid].num_groups;
 291         return 0;
 292 }
 293
 294 static int mvebu_pinmux_set(struct pinctrl_dev *pctldev, unsigned fid,
 295                             unsigned gid)
 296 {
 297         struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 298         struct mvebu_pinctrl_function *func = &pctl->functions[fid];
 299         struct mvebu_pinctrl_group *grp = &pctl->groups[gid];
 300         struct mvebu_mpp_ctrl_setting *setting;
 301         int ret;
 302         unsigned long config;
 303
 304         setting = mvebu_pinctrl_find_setting_by_name(pctl, grp,
 305                                                      func->name);
 306         if (!setting) {
 307                 dev_err(pctl->dev,
 308                         "unable to find setting %s in group %s\n",
 309                         func->name, func->groups[gid]);
 310                 return -EINVAL;
 311         }
 312
 313         config = setting->val;
 314         ret = mvebu_pinconf_group_set(pctldev, grp->gid, &config, 1);
 315         if (ret) {
 316                 dev_err(pctl->dev, "cannot set group %s to %s\n",
 317                         func->groups[gid], func->name);
 318                 return ret;
 319         }
 320
 321         return 0;
 322 }
 323
 324 static int mvebu_pinmux_gpio_request_enable(struct pinctrl_dev *pctldev,
 325                         struct pinctrl_gpio_range *range, unsigned offset)
 326 {
 327         struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 328         struct mvebu_pinctrl_group *grp;
 329         struct mvebu_mpp_ctrl_setting *setting;
 330         unsigned long config;
 331
 332         grp = mvebu_pinctrl_find_group_by_pid(pctl, offset);
 333         if (!grp)
 334                 return -EINVAL;
 335
 336         if (grp->ctrl->mpp_gpio_req)
 337                 return grp->ctrl->mpp_gpio_req(grp->data, offset);
 338
 339         setting = mvebu_pinctrl_find_gpio_setting(pctl, grp);
 340         if (!setting)
 341                 return -ENOTSUPP;
 342
 343         config = setting->val;
 344
 345         return mvebu_pinconf_group_set(pctldev, grp->gid, &config, 1);
 346 }
 347
 348 static int mvebu_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
 349            struct pinctrl_gpio_range *range, unsigned offset, bool input)
 350 {
 351         struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 352         struct mvebu_pinctrl_group *grp;
 353         struct mvebu_mpp_ctrl_setting *setting;
 354
 355         grp = mvebu_pinctrl_find_group_by_pid(pctl, offset);
 356         if (!grp)
 357                 return -EINVAL;
 358
 359         if (grp->ctrl->mpp_gpio_dir)
 360                 return grp->ctrl->mpp_gpio_dir(grp->data, offset, input);
 361
 362         setting = mvebu_pinctrl_find_gpio_setting(pctl, grp);
 363         if (!setting)
 364                 return -ENOTSUPP;
 365
 366         if ((input && (setting->flags & MVEBU_SETTING_GPI)) ||
 367             (!input && (setting->flags & MVEBU_SETTING_GPO)))
 368                 return 0;
 369
 370         return -ENOTSUPP;
 371 }
 372
 373 static const struct pinmux_ops mvebu_pinmux_ops = {
 374         .get_functions_count = mvebu_pinmux_get_funcs_count,
 375         .get_function_name = mvebu_pinmux_get_func_name,
 376         .get_function_groups = mvebu_pinmux_get_groups,
 377         .gpio_request_enable = mvebu_pinmux_gpio_request_enable,
 378         .gpio_set_direction = mvebu_pinmux_gpio_set_direction,
 379         .set_mux = mvebu_pinmux_set,
 380 };
 381
 382 static int mvebu_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
 383 {
 384         struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 385         return pctl->num_groups;
 386 }
 387
 388 static const char *mvebu_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
 389                                                 unsigned gid)
 390 {
 391         struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 392         return pctl->groups[gid].name;
 393 }
 394
 395 static int mvebu_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
 396                                         unsigned gid, const unsigned **pins,
 397                                         unsigned *num_pins)
 398 {
 399         struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 400         *pins = pctl->groups[gid].pins;
 401         *num_pins = pctl->groups[gid].npins;
 402         return 0;
 403 }
 404
 405 static int mvebu_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
 406                                         struct device_node *np,
 407                                         struct pinctrl_map **map,
 408                                         unsigned *num_maps)
 409 {
 410         struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 411         struct property *prop;
 412         const char *function;
 413         const char *group;
 414         int ret, nmaps, n;
 415
 416         *map = NULL;
 417         *num_maps = 0;
 418
 419         ret = of_property_read_string(np, "marvell,function", &function);
 420         if (ret) {
 421                 dev_err(pctl->dev,
 422                         "missing marvell,function in node %pOFn\n", np);
 423                 return 0;
 424         }
 425
 426         nmaps = of_property_count_strings(np, "marvell,pins");
 427         if (nmaps < 0) {
 428                 dev_err(pctl->dev,
 429                         "missing marvell,pins in node %pOFn\n", np);
 430                 return 0;
 431         }
 432
 433         *map = kmalloc_array(nmaps, sizeof(**map), GFP_KERNEL);
 434         if (!*map)
 435                 return -ENOMEM;
 436
 437         n = 0;
 438         of_property_for_each_string(np, "marvell,pins", prop, group) {
 439                 struct mvebu_pinctrl_group *grp =
 440                         mvebu_pinctrl_find_group_by_name(pctl, group);
 441
 442                 if (!grp) {
 443                         dev_err(pctl->dev, "unknown pin %s", group);
 444                         continue;
 445                 }
 446
 447                 if (!mvebu_pinctrl_find_setting_by_name(pctl, grp, function)) {
 448                         dev_err(pctl->dev, "unsupported function %s on pin %s",
 449                                 function, group);
 450                         continue;
 451                 }
 452
 453                 (*map)[n].type = PIN_MAP_TYPE_MUX_GROUP;
 454                 (*map)[n].data.mux.group = group;
 455                 (*map)[n].data.mux.function = function;
 456                 n++;
 457         }
 458
 459         *num_maps = nmaps;
 460
 461         return 0;
 462 }
 463
 464 static void mvebu_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
 465                                 struct pinctrl_map *map, unsigned num_maps)
 466 {
 467         kfree(map);
 468 }
 469
 470 static const struct pinctrl_ops mvebu_pinctrl_ops = {
 471         .get_groups_count = mvebu_pinctrl_get_groups_count,
 472         .get_group_name = mvebu_pinctrl_get_group_name,
 473         .get_group_pins = mvebu_pinctrl_get_group_pins,
 474         .dt_node_to_map = mvebu_pinctrl_dt_node_to_map,
 475         .dt_free_map = mvebu_pinctrl_dt_free_map,
 476 };
 477
 478 static int _add_function(struct mvebu_pinctrl_function *funcs, int *funcsize,
 479                         const char *name)
 480 {
 481         if (*funcsize <= 0)
 482                 return -EOVERFLOW;
 483
 484         while (funcs->num_groups) {
 485                 /* function already there */
 486                 if (strcmp(funcs->name, name) == 0) {
 487                         funcs->num_groups++;
 488                         return -EEXIST;
 489                 }
 490                 funcs++;
 491         }
 492
 493         /* append new unique function */
 494         funcs->name = name;
 495         funcs->num_groups = 1;
 496         (*funcsize)--;
 497
 498         return 0;
 499 }
 500
 501 static int mvebu_pinctrl_build_functions(struct platform_device *pdev,
 502                                          struct mvebu_pinctrl *pctl)
 503 {
 504         struct mvebu_pinctrl_function *funcs;
 505         int num = 0, funcsize = pctl->desc.npins;
 506         int n, s;
 507
 508         /* we allocate functions for number of pins and hope
 509          * there are fewer unique functions than pins available */
 510         funcs = devm_kcalloc(&pdev->dev,
 511                              funcsize, sizeof(struct mvebu_pinctrl_function),
 512                              GFP_KERNEL);
 513         if (!funcs)
 514                 return -ENOMEM;
 515
 516         for (n = 0; n < pctl->num_groups; n++) {
 517                 struct mvebu_pinctrl_group *grp = &pctl->groups[n];
 518                 for (s = 0; s < grp->num_settings; s++) {
 519                         int ret;
 520
 521                         /* skip unsupported settings on this variant */
 522                         if (pctl->variant &&
 523                             !(pctl->variant & grp->settings[s].variant))
 524                                 continue;
 525
 526                         /* check for unique functions and count groups */
 527                         ret = _add_function(funcs, &funcsize,
 528                                             grp->settings[s].name);
 529                         if (ret == -EOVERFLOW)
 530                                 dev_err(&pdev->dev,
 531                                         "More functions than pins(%d)\n",
 532                                         pctl->desc.npins);
 533                         if (ret < 0)
 534                                 continue;
 535
 536                         num++;
 537                 }
 538         }
 539
 540         pctl->num_functions = num;
 541         pctl->functions = funcs;
 542
 543         for (n = 0; n < pctl->num_groups; n++) {
 544                 struct mvebu_pinctrl_group *grp = &pctl->groups[n];
 545                 for (s = 0; s < grp->num_settings; s++) {
 546                         struct mvebu_pinctrl_function *f;
 547                         const char **groups;
 548
 549                         /* skip unsupported settings on this variant */
 550                         if (pctl->variant &&
 551                             !(pctl->variant & grp->settings[s].variant))
 552                                 continue;
 553
 554                         f = mvebu_pinctrl_find_function_by_name(pctl,
 555                                                         grp->settings[s].name);
 556
 557                         /* allocate group name array if not done already */
 558                         if (!f->groups) {
 559                                 f->groups = devm_kcalloc(&pdev->dev,
 560                                                  f->num_groups,
 561                                                  sizeof(char *),
 562                                                  GFP_KERNEL);
 563                                 if (!f->groups)
 564                                         return -ENOMEM;
 565                         }
 566
 567                         /* find next free group name and assign current name */
 568                         groups = f->groups;
 569                         while (*groups)
 570                                 groups++;
 571                         *groups = grp->name;
 572                 }
 573         }
 574
 575         return 0;
 576 }
 577
 578 int mvebu_pinctrl_probe(struct platform_device *pdev)
 579 {
 580         struct mvebu_pinctrl_soc_info *soc = dev_get_platdata(&pdev->dev);
 581         struct mvebu_pinctrl *pctl;
 582         struct pinctrl_pin_desc *pdesc;
 583         unsigned gid, n, k;
 584         unsigned size, noname = 0;
 585         char *noname_buf;
 586         void *p;
 587         int ret;
 588
 589         if (!soc || !soc->controls || !soc->modes) {
 590                 dev_err(&pdev->dev, "wrong pinctrl soc info\n");
 591                 return -EINVAL;
 592         }
 593
 594         pctl = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_pinctrl),
 595                         GFP_KERNEL);
 596         if (!pctl)
 597                 return -ENOMEM;
 598
 599         pctl->desc.name = dev_name(&pdev->dev);
 600         pctl->desc.owner = THIS_MODULE;
 601         pctl->desc.pctlops = &mvebu_pinctrl_ops;
 602         pctl->desc.pmxops = &mvebu_pinmux_ops;
 603         pctl->desc.confops = &mvebu_pinconf_ops;
 604         pctl->variant = soc->variant;
 605         pctl->dev = &pdev->dev;
 606         platform_set_drvdata(pdev, pctl);
 607
 608         /* count controls and create names for mvebu generic
 609            register controls; also does sanity checks */
 610         pctl->num_groups = 0;
 611         pctl->desc.npins = 0;
 612         for (n = 0; n < soc->ncontrols; n++) {
 613                 const struct mvebu_mpp_ctrl *ctrl = &soc->controls[n];
 614
 615                 pctl->desc.npins += ctrl->npins;
 616                 /* initialize control's pins[] array */
 617                 for (k = 0; k < ctrl->npins; k++)
 618                         ctrl->pins[k] = ctrl->pid + k;
 619
 620                 /*
 621                  * We allow to pass controls with NULL name that we treat
 622                  * as a range of one-pin groups with generic mvebu register
 623                  * controls.
 624                  */
 625                 if (!ctrl->name) {
 626                         pctl->num_groups += ctrl->npins;
 627                         noname += ctrl->npins;
 628                 } else {
 629                         pctl->num_groups += 1;
 630                 }
 631         }
 632
 633         pdesc = devm_kcalloc(&pdev->dev,
 634                              pctl->desc.npins,
 635                              sizeof(struct pinctrl_pin_desc),
 636                              GFP_KERNEL);
 637         if (!pdesc)
 638                 return -ENOMEM;
 639
 640         for (n = 0; n < pctl->desc.npins; n++)
 641                 pdesc[n].number = n;
 642         pctl->desc.pins = pdesc;
 643
 644         /*
 645          * allocate groups and name buffers for unnamed groups.
 646          */
 647         size = pctl->num_groups * sizeof(*pctl->groups) + noname * 8;
 648         p = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
 649         if (!p)
 650                 return -ENOMEM;
 651
 652         pctl->groups = p;
 653         noname_buf = p + pctl->num_groups * sizeof(*pctl->groups);
 654
 655         /* assign mpp controls to groups */
 656         gid = 0;
 657         for (n = 0; n < soc->ncontrols; n++) {
 658                 const struct mvebu_mpp_ctrl *ctrl = &soc->controls[n];
 659                 struct mvebu_mpp_ctrl_data *data = soc->control_data ?
 660                                                    &soc->control_data[n] : NULL;
 661
 662                 pctl->groups[gid].gid = gid;
 663                 pctl->groups[gid].ctrl = ctrl;
 664                 pctl->groups[gid].data = data;
 665                 pctl->groups[gid].name = ctrl->name;
 666                 pctl->groups[gid].pins = ctrl->pins;
 667                 pctl->groups[gid].npins = ctrl->npins;
 668
 669                 /*
 670                  * We treat unnamed controls as a range of one-pin groups
 671                  * with generic mvebu register controls. Use one group for
 672                  * each in this range and assign a default group name.
 673                  */
 674                 if (!ctrl->name) {
 675                         pctl->groups[gid].name = noname_buf;
 676                         pctl->groups[gid].npins = 1;
 677                         sprintf(noname_buf, "mpp%d", ctrl->pid+0);
 678                         noname_buf += 8;
 679
 680                         for (k = 1; k < ctrl->npins; k++) {
 681                                 gid++;
 682                                 pctl->groups[gid].gid = gid;
 683                                 pctl->groups[gid].ctrl = ctrl;
 684                                 pctl->groups[gid].data = data;
 685                                 pctl->groups[gid].name = noname_buf;
 686                                 pctl->groups[gid].pins = &ctrl->pins[k];
 687                                 pctl->groups[gid].npins = 1;
 688                                 sprintf(noname_buf, "mpp%d", ctrl->pid+k);
 689                                 noname_buf += 8;
 690                         }
 691                 }
 692                 gid++;
 693         }
 694
 695         /* assign mpp modes to groups */
 696         for (n = 0; n < soc->nmodes; n++) {
 697                 struct mvebu_mpp_mode *mode = &soc->modes[n];
 698                 struct mvebu_mpp_ctrl_setting *set = &mode->settings[0];
 699                 struct mvebu_pinctrl_group *grp;
 700                 unsigned num_settings;
 701                 unsigned supp_settings;
 702
 703                 for (num_settings = 0, supp_settings = 0; ; set++) {
 704                         if (!set->name)
 705                                 break;
 706
 707                         num_settings++;
 708
 709                         /* skip unsupported settings for this variant */
 710                         if (pctl->variant && !(pctl->variant & set->variant))
 711                                 continue;
 712
 713                         supp_settings++;
 714
 715                         /* find gpio/gpo/gpi settings */
 716                         if (strcmp(set->name, "gpio") == 0)
 717                                 set->flags = MVEBU_SETTING_GPI |
 718                                         MVEBU_SETTING_GPO;
 719                         else if (strcmp(set->name, "gpo") == 0)
 720                                 set->flags = MVEBU_SETTING_GPO;
 721                         else if (strcmp(set->name, "gpi") == 0)
 722                                 set->flags = MVEBU_SETTING_GPI;
 723                 }
 724
 725                 /* skip modes with no settings for this variant */
 726                 if (!supp_settings)
 727                         continue;
 728
 729                 grp = mvebu_pinctrl_find_group_by_pid(pctl, mode->pid);
 730                 if (!grp) {
 731                         dev_warn(&pdev->dev, "unknown pinctrl group %d\n",
 732                                 mode->pid);
 733                         continue;
 734                 }
 735
 736                 grp->settings = mode->settings;
 737                 grp->num_settings = num_settings;
 738         }
 739
 740         ret = mvebu_pinctrl_build_functions(pdev, pctl);
 741         if (ret) {
 742                 dev_err(&pdev->dev, "unable to build functions\n");
 743                 return ret;
 744         }
 745
 746         pctl->pctldev = devm_pinctrl_register(&pdev->dev, &pctl->desc, pctl);
 747         if (IS_ERR(pctl->pctldev)) {
 748                 dev_err(&pdev->dev, "unable to register pinctrl driver\n");
 749                 return PTR_ERR(pctl->pctldev);
 750         }
 751
 752         dev_info(&pdev->dev, "registered pinctrl driver\n");
 753
 754         /* register gpio ranges */
 755         for (n = 0; n < soc->ngpioranges; n++)
 756                 pinctrl_add_gpio_range(pctl->pctldev, &soc->gpioranges[n]);
 757
 758         return 0;
 759 }
 760
 761 /*
 762  * mvebu_pinctrl_simple_mmio_probe - probe a simple mmio pinctrl
 763  * @pdev: platform device (with platform data already attached)
 764  *
 765  * Initialise a simple (single base address) mmio pinctrl driver,
 766  * assigning the MMIO base address to all mvebu mpp ctrl instances.
 767  */
 768 int mvebu_pinctrl_simple_mmio_probe(struct platform_device *pdev)
 769 {
 770         struct mvebu_pinctrl_soc_info *soc = dev_get_platdata(&pdev->dev);
 771         struct mvebu_mpp_ctrl_data *mpp_data;
 772         void __iomem *base;
 773         int i;
 774
 775         base = devm_platform_ioremap_resource(pdev, 0);
 776         if (IS_ERR(base))
 777                 return PTR_ERR(base);
 778
 779         mpp_data = devm_kcalloc(&pdev->dev, soc->ncontrols, sizeof(*mpp_data),
 780                                 GFP_KERNEL);
 781         if (!mpp_data)
 782                 return -ENOMEM;
 783
 784         for (i = 0; i < soc->ncontrols; i++)
 785                 mpp_data[i].base = base;
 786
 787         soc->control_data = mpp_data;
 788
 789         return mvebu_pinctrl_probe(pdev);
 790 }
 791
 792 int mvebu_regmap_mpp_ctrl_get(struct mvebu_mpp_ctrl_data *data,
 793                               unsigned int pid, unsigned long *config)
 794 {
 795         unsigned off = (pid / MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
 796         unsigned shift = (pid % MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
 797         unsigned int val;
 798         int err;
 799
 800         err = regmap_read(data->regmap.map, data->regmap.offset + off, &val);
 801         if (err)
 802                 return err;
 803
 804         *config = (val >> shift) & MVEBU_MPP_MASK;
 805
 806         return 0;
 807 }
 808
 809 int mvebu_regmap_mpp_ctrl_set(struct mvebu_mpp_ctrl_data *data,
 810                               unsigned int pid, unsigned long config)
 811 {
 812         unsigned off = (pid / MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
 813         unsigned shift = (pid % MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
 814
 815         return regmap_update_bits(data->regmap.map, data->regmap.offset + off,
 816                                   MVEBU_MPP_MASK << shift, config << shift);
 817 }
 818
 819 int mvebu_pinctrl_simple_regmap_probe(struct platform_device *pdev,
 820                                       struct device *syscon_dev, u32 offset)
 821 {
 822         struct mvebu_pinctrl_soc_info *soc = dev_get_platdata(&pdev->dev);
 823         struct mvebu_mpp_ctrl_data *mpp_data;
 824         struct regmap *regmap;
 825         int i;
 826
 827         regmap = syscon_node_to_regmap(syscon_dev->of_node);
 828         if (IS_ERR(regmap))
 829                 return PTR_ERR(regmap);
 830
 831         mpp_data = devm_kcalloc(&pdev->dev, soc->ncontrols, sizeof(*mpp_data),
 832                                 GFP_KERNEL);
 833         if (!mpp_data)
 834                 return -ENOMEM;
 835
 836         for (i = 0; i < soc->ncontrols; i++) {
 837                 mpp_data[i].regmap.map = regmap;
 838                 mpp_data[i].regmap.offset = offset;
 839         }
 840
 841         soc->control_data = mpp_data;
 842
 843         return mvebu_pinctrl_probe(pdev);
 844 }