drivers/pinctrl/freescale/pinctrl-mxs.c

   1 /*
   2  * Copyright 2012 Freescale Semiconductor, Inc.
   3  *
   4  * The code contained herein is licensed under the GNU General Public
   5  * License. You may obtain a copy of the GNU General Public License
   6  * Version 2 or later at the following locations:
   7  *
   8  * http://www.opensource.org/licenses/gpl-license.html
   9  * http://www.gnu.org/copyleft/gpl.html
  10  */
  11
  12 #include <linux/err.h>
  13 #include <linux/init.h>
  14 #include <linux/io.h>
  15 #include <linux/of.h>
  16 #include <linux/of_address.h>
  17 #include <linux/pinctrl/machine.h>
  18 #include <linux/pinctrl/pinconf.h>
  19 #include <linux/pinctrl/pinctrl.h>
  20 #include <linux/pinctrl/pinmux.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/slab.h>
  23 #include "../core.h"
  24 #include "pinctrl-mxs.h"
  25
  26 #define SUFFIX_LEN      4
  27
  28 struct mxs_pinctrl_data {
  29         struct device *dev;
  30         struct pinctrl_dev *pctl;
  31         void __iomem *base;
  32         struct mxs_pinctrl_soc_data *soc;
  33 };
  34
  35 static int mxs_get_groups_count(struct pinctrl_dev *pctldev)
  36 {
  37         struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev);
  38
  39         return d->soc->ngroups;
  40 }
  41
  42 static const char *mxs_get_group_name(struct pinctrl_dev *pctldev,
  43                                       unsigned group)
  44 {
  45         struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev);
  46
  47         return d->soc->groups[group].name;
  48 }
  49
  50 static int mxs_get_group_pins(struct pinctrl_dev *pctldev, unsigned group,
  51                               const unsigned **pins, unsigned *num_pins)
  52 {
  53         struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev);
  54
  55         *pins = d->soc->groups[group].pins;
  56         *num_pins = d->soc->groups[group].npins;
  57
  58         return 0;
  59 }
  60
  61 static void mxs_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
  62                              unsigned offset)
  63 {
  64         seq_printf(s, " %s", dev_name(pctldev->dev));
  65 }
  66
  67 static int mxs_dt_node_to_map(struct pinctrl_dev *pctldev,
  68                               struct device_node *np,
  69                               struct pinctrl_map **map, unsigned *num_maps)
  70 {
  71         struct pinctrl_map *new_map;
  72         char *group = NULL;
  73         unsigned new_num = 1;
  74         unsigned long config = 0;
  75         unsigned long *pconfig;
  76         int length = strlen(np->name) + SUFFIX_LEN;
  77         bool purecfg = false;
  78         u32 val, reg;
  79         int ret, i = 0;
  80
  81         /* Check for pin config node which has no 'reg' property */
  82         if (of_property_read_u32(np, "reg", &reg))
  83                 purecfg = true;
  84
  85         ret = of_property_read_u32(np, "fsl,drive-strength", &val);
  86         if (!ret)
  87                 config = val | MA_PRESENT;
  88         ret = of_property_read_u32(np, "fsl,voltage", &val);
  89         if (!ret)
  90                 config |= val << VOL_SHIFT | VOL_PRESENT;
  91         ret = of_property_read_u32(np, "fsl,pull-up", &val);
  92         if (!ret)
  93                 config |= val << PULL_SHIFT | PULL_PRESENT;
  94
  95         /* Check for group node which has both mux and config settings */
  96         if (!purecfg && config)
  97                 new_num = 2;
  98
  99         new_map = kzalloc(sizeof(*new_map) * new_num, GFP_KERNEL);
 100         if (!new_map)
 101                 return -ENOMEM;
 102
 103         if (!purecfg) {
 104                 new_map[i].type = PIN_MAP_TYPE_MUX_GROUP;
 105                 new_map[i].data.mux.function = np->name;
 106
 107                 /* Compose group name */
 108                 group = kzalloc(length, GFP_KERNEL);
 109                 if (!group) {
 110                         ret = -ENOMEM;
 111                         goto free;
 112                 }
 113                 snprintf(group, length, "%s.%d", np->name, reg);
 114                 new_map[i].data.mux.group = group;
 115                 i++;
 116         }
 117
 118         if (config) {
 119                 pconfig = kmemdup(&config, sizeof(config), GFP_KERNEL);
 120                 if (!pconfig) {
 121                         ret = -ENOMEM;
 122                         goto free_group;
 123                 }
 124
 125                 new_map[i].type = PIN_MAP_TYPE_CONFIGS_GROUP;
 126                 new_map[i].data.configs.group_or_pin = purecfg ? np->name :
 127                                                                  group;
 128                 new_map[i].data.configs.configs = pconfig;
 129                 new_map[i].data.configs.num_configs = 1;
 130         }
 131
 132         *map = new_map;
 133         *num_maps = new_num;
 134
 135         return 0;
 136
 137 free_group:
 138         if (!purecfg)
 139                 kfree(group);
 140 free:
 141         kfree(new_map);
 142         return ret;
 143 }
 144
 145 static void mxs_dt_free_map(struct pinctrl_dev *pctldev,
 146                             struct pinctrl_map *map, unsigned num_maps)
 147 {
 148         u32 i;
 149
 150         for (i = 0; i < num_maps; i++) {
 151                 if (map[i].type == PIN_MAP_TYPE_MUX_GROUP)
 152                         kfree(map[i].data.mux.group);
 153                 if (map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP)
 154                         kfree(map[i].data.configs.configs);
 155         }
 156
 157         kfree(map);
 158 }
 159
 160 static const struct pinctrl_ops mxs_pinctrl_ops = {
 161         .get_groups_count = mxs_get_groups_count,
 162         .get_group_name = mxs_get_group_name,
 163         .get_group_pins = mxs_get_group_pins,
 164         .pin_dbg_show = mxs_pin_dbg_show,
 165         .dt_node_to_map = mxs_dt_node_to_map,
 166         .dt_free_map = mxs_dt_free_map,
 167 };
 168
 169 static int mxs_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
 170 {
 171         struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev);
 172
 173         return d->soc->nfunctions;
 174 }
 175
 176 static const char *mxs_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
 177                                              unsigned function)
 178 {
 179         struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev);
 180
 181         return d->soc->functions[function].name;
 182 }
 183
 184 static int mxs_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
 185                                        unsigned group,
 186                                        const char * const **groups,
 187                                        unsigned * const num_groups)
 188 {
 189         struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev);
 190
 191         *groups = d->soc->functions[group].groups;
 192         *num_groups = d->soc->functions[group].ngroups;
 193
 194         return 0;
 195 }
 196
 197 static int mxs_pinctrl_set_mux(struct pinctrl_dev *pctldev, unsigned selector,
 198                                unsigned group)
 199 {
 200         struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev);
 201         struct mxs_group *g = &d->soc->groups[group];
 202         void __iomem *reg;
 203         u8 bank, shift;
 204         u16 pin;
 205         u32 i;
 206
 207         for (i = 0; i < g->npins; i++) {
 208                 bank = PINID_TO_BANK(g->pins[i]);
 209                 pin = PINID_TO_PIN(g->pins[i]);
 210                 reg = d->base + d->soc->regs->muxsel;
 211                 reg += bank * 0x20 + pin / 16 * 0x10;
 212                 shift = pin % 16 * 2;
 213
 214                 writel(0x3 << shift, reg + CLR);
 215                 writel(g->muxsel[i] << shift, reg + SET);
 216         }
 217
 218         return 0;
 219 }
 220
 221 static const struct pinmux_ops mxs_pinmux_ops = {
 222         .get_functions_count = mxs_pinctrl_get_funcs_count,
 223         .get_function_name = mxs_pinctrl_get_func_name,
 224         .get_function_groups = mxs_pinctrl_get_func_groups,
 225         .set_mux = mxs_pinctrl_set_mux,
 226 };
 227
 228 static int mxs_pinconf_get(struct pinctrl_dev *pctldev,
 229                            unsigned pin, unsigned long *config)
 230 {
 231         return -ENOTSUPP;
 232 }
 233
 234 static int mxs_pinconf_set(struct pinctrl_dev *pctldev,
 235                            unsigned pin, unsigned long *configs,
 236                            unsigned num_configs)
 237 {
 238         return -ENOTSUPP;
 239 }
 240
 241 static int mxs_pinconf_group_get(struct pinctrl_dev *pctldev,
 242                                  unsigned group, unsigned long *config)
 243 {
 244         struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev);
 245
 246         *config = d->soc->groups[group].config;
 247
 248         return 0;
 249 }
 250
 251 static int mxs_pinconf_group_set(struct pinctrl_dev *pctldev,
 252                                  unsigned group, unsigned long *configs,
 253                                  unsigned num_configs)
 254 {
 255         struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev);
 256         struct mxs_group *g = &d->soc->groups[group];
 257         void __iomem *reg;
 258         u8 ma, vol, pull, bank, shift;
 259         u16 pin;
 260         u32 i;
 261         int n;
 262         unsigned long config;
 263
 264         for (n = 0; n < num_configs; n++) {
 265                 config = configs[n];
 266
 267                 ma = CONFIG_TO_MA(config);
 268                 vol = CONFIG_TO_VOL(config);
 269                 pull = CONFIG_TO_PULL(config);
 270
 271                 for (i = 0; i < g->npins; i++) {
 272                         bank = PINID_TO_BANK(g->pins[i]);
 273                         pin = PINID_TO_PIN(g->pins[i]);
 274
 275                         /* drive */
 276                         reg = d->base + d->soc->regs->drive;
 277                         reg += bank * 0x40 + pin / 8 * 0x10;
 278
 279                         /* mA */
 280                         if (config & MA_PRESENT) {
 281                                 shift = pin % 8 * 4;
 282                                 writel(0x3 << shift, reg + CLR);
 283                                 writel(ma << shift, reg + SET);
 284                         }
 285
 286                         /* vol */
 287                         if (config & VOL_PRESENT) {
 288                                 shift = pin % 8 * 4 + 2;
 289                                 if (vol)
 290                                         writel(1 << shift, reg + SET);
 291                                 else
 292                                         writel(1 << shift, reg + CLR);
 293                         }
 294
 295                         /* pull */
 296                         if (config & PULL_PRESENT) {
 297                                 reg = d->base + d->soc->regs->pull;
 298                                 reg += bank * 0x10;
 299                                 shift = pin;
 300                                 if (pull)
 301                                         writel(1 << shift, reg + SET);
 302                                 else
 303                                         writel(1 << shift, reg + CLR);
 304                         }
 305                 }
 306
 307                 /* cache the config value for mxs_pinconf_group_get() */
 308                 g->config = config;
 309
 310         } /* for each config */
 311
 312         return 0;
 313 }
 314
 315 static void mxs_pinconf_dbg_show(struct pinctrl_dev *pctldev,
 316                                  struct seq_file *s, unsigned pin)
 317 {
 318         /* Not support */
 319 }
 320
 321 static void mxs_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
 322                                        struct seq_file *s, unsigned group)
 323 {
 324         unsigned long config;
 325
 326         if (!mxs_pinconf_group_get(pctldev, group, &config))
 327                 seq_printf(s, "0x%lx", config);
 328 }
 329
 330 static const struct pinconf_ops mxs_pinconf_ops = {
 331         .pin_config_get = mxs_pinconf_get,
 332         .pin_config_set = mxs_pinconf_set,
 333         .pin_config_group_get = mxs_pinconf_group_get,
 334         .pin_config_group_set = mxs_pinconf_group_set,
 335         .pin_config_dbg_show = mxs_pinconf_dbg_show,
 336         .pin_config_group_dbg_show = mxs_pinconf_group_dbg_show,
 337 };
 338
 339 static struct pinctrl_desc mxs_pinctrl_desc = {
 340         .pctlops = &mxs_pinctrl_ops,
 341         .pmxops = &mxs_pinmux_ops,
 342         .confops = &mxs_pinconf_ops,
 343         .owner = THIS_MODULE,
 344 };
 345
 346 static int mxs_pinctrl_parse_group(struct platform_device *pdev,
 347                                    struct device_node *np, int idx,
 348                                    const char **out_name)
 349 {
 350         struct mxs_pinctrl_data *d = platform_get_drvdata(pdev);
 351         struct mxs_group *g = &d->soc->groups[idx];
 352         struct property *prop;
 353         const char *propname = "fsl,pinmux-ids";
 354         char *group;
 355         int length = strlen(np->name) + SUFFIX_LEN;
 356         u32 val, i;
 357
 358         group = devm_kzalloc(&pdev->dev, length, GFP_KERNEL);
 359         if (!group)
 360                 return -ENOMEM;
 361         if (of_property_read_u32(np, "reg", &val))
 362                 snprintf(group, length, "%s", np->name);
 363         else
 364                 snprintf(group, length, "%s.%d", np->name, val);
 365         g->name = group;
 366
 367         prop = of_find_property(np, propname, &length);
 368         if (!prop)
 369                 return -EINVAL;
 370         g->npins = length / sizeof(u32);
 371
 372         g->pins = devm_kzalloc(&pdev->dev, g->npins * sizeof(*g->pins),
 373                                GFP_KERNEL);
 374         if (!g->pins)
 375                 return -ENOMEM;
 376
 377         g->muxsel = devm_kzalloc(&pdev->dev, g->npins * sizeof(*g->muxsel),
 378                                  GFP_KERNEL);
 379         if (!g->muxsel)
 380                 return -ENOMEM;
 381
 382         of_property_read_u32_array(np, propname, g->pins, g->npins);
 383         for (i = 0; i < g->npins; i++) {
 384                 g->muxsel[i] = MUXID_TO_MUXSEL(g->pins[i]);
 385                 g->pins[i] = MUXID_TO_PINID(g->pins[i]);
 386         }
 387
 388         if (out_name)
 389                 *out_name = g->name;
 390
 391         return 0;
 392 }
 393
 394 static int mxs_pinctrl_probe_dt(struct platform_device *pdev,
 395                                 struct mxs_pinctrl_data *d)
 396 {
 397         struct mxs_pinctrl_soc_data *soc = d->soc;
 398         struct device_node *np = pdev->dev.of_node;
 399         struct device_node *child;
 400         struct mxs_function *f;
 401         const char *gpio_compat = "fsl,mxs-gpio";
 402         const char *fn, *fnull = "";
 403         int i = 0, idxf = 0, idxg = 0;
 404         int ret;
 405         u32 val;
 406
 407         child = of_get_next_child(np, NULL);
 408         if (!child) {
 409                 dev_err(&pdev->dev, "no group is defined\n");
 410                 return -ENOENT;
 411         }
 412
 413         /* Count total functions and groups */
 414         fn = fnull;
 415         for_each_child_of_node(np, child) {
 416                 if (of_device_is_compatible(child, gpio_compat))
 417                         continue;
 418                 soc->ngroups++;
 419                 /* Skip pure pinconf node */
 420                 if (of_property_read_u32(child, "reg", &val))
 421                         continue;
 422                 if (strcmp(fn, child->name)) {
 423                         fn = child->name;
 424                         soc->nfunctions++;
 425                 }
 426         }
 427
 428         soc->functions = devm_kzalloc(&pdev->dev, soc->nfunctions *
 429                                       sizeof(*soc->functions), GFP_KERNEL);
 430         if (!soc->functions)
 431                 return -ENOMEM;
 432
 433         soc->groups = devm_kzalloc(&pdev->dev, soc->ngroups *
 434                                    sizeof(*soc->groups), GFP_KERNEL);
 435         if (!soc->groups)
 436                 return -ENOMEM;
 437
 438         /* Count groups for each function */
 439         fn = fnull;
 440         f = &soc->functions[idxf];
 441         for_each_child_of_node(np, child) {
 442                 if (of_device_is_compatible(child, gpio_compat))
 443                         continue;
 444                 if (of_property_read_u32(child, "reg", &val))
 445                         continue;
 446                 if (strcmp(fn, child->name)) {
 447                         struct device_node *child2;
 448
 449                         /*
 450                          * This reference is dropped by
 451                          * of_get_next_child(np, * child)
 452                          */
 453                         of_node_get(child);
 454
 455                         /*
 456                          * The logic parsing the functions from dt currently
 457                          * doesn't handle if functions with the same name are
 458                          * not grouped together. Only the first contiguous
 459                          * cluster is usable for each function name. This is a
 460                          * bug that is not trivial to fix, but at least warn
 461                          * about it.
 462                          */
 463                         for (child2 = of_get_next_child(np, child);
 464                              child2 != NULL;
 465                              child2 = of_get_next_child(np, child2)) {
 466                                 if (!strcmp(child2->name, fn))
 467                                         dev_warn(&pdev->dev,
 468                                                  "function nodes must be grouped by name (failed for: %s)",
 469                                                  fn);
 470                         }
 471
 472                         f = &soc->functions[idxf++];
 473                         f->name = fn = child->name;
 474                 }
 475                 f->ngroups++;
 476         }
 477
 478         /* Get groups for each function */
 479         idxf = 0;
 480         fn = fnull;
 481         for_each_child_of_node(np, child) {
 482                 if (of_device_is_compatible(child, gpio_compat))
 483                         continue;
 484                 if (of_property_read_u32(child, "reg", &val)) {
 485                         ret = mxs_pinctrl_parse_group(pdev, child,
 486                                                       idxg++, NULL);
 487                         if (ret)
 488                                 return ret;
 489                         continue;
 490                 }
 491
 492                 if (strcmp(fn, child->name)) {
 493                         f = &soc->functions[idxf++];
 494                         f->groups = devm_kzalloc(&pdev->dev, f->ngroups *
 495                                                  sizeof(*f->groups),
 496                                                  GFP_KERNEL);
 497                         if (!f->groups)
 498                                 return -ENOMEM;
 499                         fn = child->name;
 500                         i = 0;
 501                 }
 502                 ret = mxs_pinctrl_parse_group(pdev, child, idxg++,
 503                                               &f->groups[i++]);
 504                 if (ret)
 505                         return ret;
 506         }
 507
 508         return 0;
 509 }
 510
 511 int mxs_pinctrl_probe(struct platform_device *pdev,
 512                       struct mxs_pinctrl_soc_data *soc)
 513 {
 514         struct device_node *np = pdev->dev.of_node;
 515         struct mxs_pinctrl_data *d;
 516         int ret;
 517
 518         d = devm_kzalloc(&pdev->dev, sizeof(*d), GFP_KERNEL);
 519         if (!d)
 520                 return -ENOMEM;
 521
 522         d->dev = &pdev->dev;
 523         d->soc = soc;
 524
 525         d->base = of_iomap(np, 0);
 526         if (!d->base)
 527                 return -EADDRNOTAVAIL;
 528
 529         mxs_pinctrl_desc.pins = d->soc->pins;
 530         mxs_pinctrl_desc.npins = d->soc->npins;
 531         mxs_pinctrl_desc.name = dev_name(&pdev->dev);
 532
 533         platform_set_drvdata(pdev, d);
 534
 535         ret = mxs_pinctrl_probe_dt(pdev, d);
 536         if (ret) {
 537                 dev_err(&pdev->dev, "dt probe failed: %d\n", ret);
 538                 goto err;
 539         }
 540
 541         d->pctl = pinctrl_register(&mxs_pinctrl_desc, &pdev->dev, d);
 542         if (IS_ERR(d->pctl)) {
 543                 dev_err(&pdev->dev, "Couldn't register MXS pinctrl driver\n");
 544                 ret = PTR_ERR(d->pctl);
 545                 goto err;
 546         }
 547
 548         return 0;
 549
 550 err:
 551         iounmap(d->base);
 552         return ret;
 553 }
 554 EXPORT_SYMBOL_GPL(mxs_pinctrl_probe);