drivers/pinctrl/tegra/pinctrl-tegra.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Driver for the NVIDIA Tegra pinmux
   4  *
   5  * Copyright (c) 2011-2012, NVIDIA CORPORATION.  All rights reserved.
   6  *
   7  * Derived from code:
   8  * Copyright (C) 2010 Google, Inc.
   9  * Copyright (C) 2010 NVIDIA Corporation
  10  * Copyright (C) 2009-2011 ST-Ericsson AB
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/init.h>
  15 #include <linux/io.h>
  16 #include <linux/of.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/seq_file.h>
  19 #include <linux/slab.h>
  20
  21 #include <linux/pinctrl/machine.h>
  22 #include <linux/pinctrl/pinconf.h>
  23 #include <linux/pinctrl/pinctrl.h>
  24 #include <linux/pinctrl/pinmux.h>
  25
  26 #include "../core.h"
  27 #include "../pinctrl-utils.h"
  28 #include "pinctrl-tegra.h"
  29
  30 static inline u32 pmx_readl(struct tegra_pmx *pmx, u32 bank, u32 reg)
  31 {
  32         return readl(pmx->regs[bank] + reg);
  33 }
  34
  35 static inline void pmx_writel(struct tegra_pmx *pmx, u32 val, u32 bank, u32 reg)
  36 {
  37         writel_relaxed(val, pmx->regs[bank] + reg);
  38         /* make sure pinmux register write completed */
  39         pmx_readl(pmx, bank, reg);
  40 }
  41
  42 static int tegra_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
  43 {
  44         struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
  45
  46         return pmx->soc->ngroups;
  47 }
  48
  49 static const char *tegra_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
  50                                                 unsigned group)
  51 {
  52         struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
  53
  54         return pmx->soc->groups[group].name;
  55 }
  56
  57 static int tegra_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
  58                                         unsigned group,
  59                                         const unsigned **pins,
  60                                         unsigned *num_pins)
  61 {
  62         struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
  63
  64         *pins = pmx->soc->groups[group].pins;
  65         *num_pins = pmx->soc->groups[group].npins;
  66
  67         return 0;
  68 }
  69
  70 #ifdef CONFIG_DEBUG_FS
  71 static void tegra_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
  72                                        struct seq_file *s,
  73                                        unsigned offset)
  74 {
  75         seq_printf(s, " %s", dev_name(pctldev->dev));
  76 }
  77 #endif
  78
  79 static const struct cfg_param {
  80         const char *property;
  81         enum tegra_pinconf_param param;
  82 } cfg_params[] = {
  83         {"nvidia,pull",                 TEGRA_PINCONF_PARAM_PULL},
  84         {"nvidia,tristate",             TEGRA_PINCONF_PARAM_TRISTATE},
  85         {"nvidia,enable-input",         TEGRA_PINCONF_PARAM_ENABLE_INPUT},
  86         {"nvidia,open-drain",           TEGRA_PINCONF_PARAM_OPEN_DRAIN},
  87         {"nvidia,lock",                 TEGRA_PINCONF_PARAM_LOCK},
  88         {"nvidia,io-reset",             TEGRA_PINCONF_PARAM_IORESET},
  89         {"nvidia,rcv-sel",              TEGRA_PINCONF_PARAM_RCV_SEL},
  90         {"nvidia,io-hv",                TEGRA_PINCONF_PARAM_RCV_SEL},
  91         {"nvidia,high-speed-mode",      TEGRA_PINCONF_PARAM_HIGH_SPEED_MODE},
  92         {"nvidia,schmitt",              TEGRA_PINCONF_PARAM_SCHMITT},
  93         {"nvidia,low-power-mode",       TEGRA_PINCONF_PARAM_LOW_POWER_MODE},
  94         {"nvidia,pull-down-strength",   TEGRA_PINCONF_PARAM_DRIVE_DOWN_STRENGTH},
  95         {"nvidia,pull-up-strength",     TEGRA_PINCONF_PARAM_DRIVE_UP_STRENGTH},
  96         {"nvidia,slew-rate-falling",    TEGRA_PINCONF_PARAM_SLEW_RATE_FALLING},
  97         {"nvidia,slew-rate-rising",     TEGRA_PINCONF_PARAM_SLEW_RATE_RISING},
  98         {"nvidia,drive-type",           TEGRA_PINCONF_PARAM_DRIVE_TYPE},
  99 };
 100
 101 static int tegra_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
 102                                            struct device_node *np,
 103                                            struct pinctrl_map **map,
 104                                            unsigned *reserved_maps,
 105                                            unsigned *num_maps)
 106 {
 107         struct device *dev = pctldev->dev;
 108         int ret, i;
 109         const char *function;
 110         u32 val;
 111         unsigned long config;
 112         unsigned long *configs = NULL;
 113         unsigned num_configs = 0;
 114         unsigned reserve;
 115         struct property *prop;
 116         const char *group;
 117
 118         ret = of_property_read_string(np, "nvidia,function", &function);
 119         if (ret < 0) {
 120                 /* EINVAL=missing, which is fine since it's optional */
 121                 if (ret != -EINVAL)
 122                         dev_err(dev,
 123                                 "%pOF: could not parse property nvidia,function\n", np);
 124                 function = NULL;
 125         }
 126
 127         for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
 128                 ret = of_property_read_u32(np, cfg_params[i].property, &val);
 129                 if (!ret) {
 130                         config = TEGRA_PINCONF_PACK(cfg_params[i].param, val);
 131                         ret = pinctrl_utils_add_config(pctldev, &configs,
 132                                         &num_configs, config);
 133                         if (ret < 0)
 134                                 goto exit;
 135                 /* EINVAL=missing, which is fine since it's optional */
 136                 } else if (ret != -EINVAL) {
 137                         dev_err(dev, "%pOF: could not parse property %s\n",
 138                                 np, cfg_params[i].property);
 139                 }
 140         }
 141
 142         reserve = 0;
 143         if (function != NULL)
 144                 reserve++;
 145         if (num_configs)
 146                 reserve++;
 147         ret = of_property_count_strings(np, "nvidia,pins");
 148         if (ret < 0) {
 149                 dev_err(dev, "%pOF: could not parse property nvidia,pins\n", np);
 150                 goto exit;
 151         }
 152         reserve *= ret;
 153
 154         ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
 155                                         num_maps, reserve);
 156         if (ret < 0)
 157                 goto exit;
 158
 159         of_property_for_each_string(np, "nvidia,pins", prop, group) {
 160                 if (function) {
 161                         ret = pinctrl_utils_add_map_mux(pctldev, map,
 162                                         reserved_maps, num_maps, group,
 163                                         function);
 164                         if (ret < 0)
 165                                 goto exit;
 166                 }
 167
 168                 if (num_configs) {
 169                         ret = pinctrl_utils_add_map_configs(pctldev, map,
 170                                         reserved_maps, num_maps, group,
 171                                         configs, num_configs,
 172                                         PIN_MAP_TYPE_CONFIGS_GROUP);
 173                         if (ret < 0)
 174                                 goto exit;
 175                 }
 176         }
 177
 178         ret = 0;
 179
 180 exit:
 181         kfree(configs);
 182         return ret;
 183 }
 184
 185 static int tegra_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
 186                                         struct device_node *np_config,
 187                                         struct pinctrl_map **map,
 188                                         unsigned *num_maps)
 189 {
 190         unsigned reserved_maps;
 191         struct device_node *np;
 192         int ret;
 193
 194         reserved_maps = 0;
 195         *map = NULL;
 196         *num_maps = 0;
 197
 198         for_each_child_of_node(np_config, np) {
 199                 ret = tegra_pinctrl_dt_subnode_to_map(pctldev, np, map,
 200                                                       &reserved_maps, num_maps);
 201                 if (ret < 0) {
 202                         pinctrl_utils_free_map(pctldev, *map,
 203                                 *num_maps);
 204                         of_node_put(np);
 205                         return ret;
 206                 }
 207         }
 208
 209         return 0;
 210 }
 211
 212 static const struct pinctrl_ops tegra_pinctrl_ops = {
 213         .get_groups_count = tegra_pinctrl_get_groups_count,
 214         .get_group_name = tegra_pinctrl_get_group_name,
 215         .get_group_pins = tegra_pinctrl_get_group_pins,
 216 #ifdef CONFIG_DEBUG_FS
 217         .pin_dbg_show = tegra_pinctrl_pin_dbg_show,
 218 #endif
 219         .dt_node_to_map = tegra_pinctrl_dt_node_to_map,
 220         .dt_free_map = pinctrl_utils_free_map,
 221 };
 222
 223 static int tegra_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
 224 {
 225         struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
 226
 227         return pmx->soc->nfunctions;
 228 }
 229
 230 static const char *tegra_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
 231                                                unsigned function)
 232 {
 233         struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
 234
 235         return pmx->functions[function].name;
 236 }
 237
 238 static int tegra_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
 239                                          unsigned function,
 240                                          const char * const **groups,
 241                                          unsigned * const num_groups)
 242 {
 243         struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
 244
 245         *groups = pmx->functions[function].groups;
 246         *num_groups = pmx->functions[function].ngroups;
 247
 248         return 0;
 249 }
 250
 251 static int tegra_pinctrl_set_mux(struct pinctrl_dev *pctldev,
 252                                  unsigned function,
 253                                  unsigned group)
 254 {
 255         struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
 256         const struct tegra_pingroup *g;
 257         int i;
 258         u32 val;
 259
 260         g = &pmx->soc->groups[group];
 261
 262         if (WARN_ON(g->mux_reg < 0))
 263                 return -EINVAL;
 264
 265         for (i = 0; i < ARRAY_SIZE(g->funcs); i++) {
 266                 if (g->funcs[i] == function)
 267                         break;
 268         }
 269         if (WARN_ON(i == ARRAY_SIZE(g->funcs)))
 270                 return -EINVAL;
 271
 272         val = pmx_readl(pmx, g->mux_bank, g->mux_reg);
 273         val &= ~(0x3 << g->mux_bit);
 274         val |= i << g->mux_bit;
 275         pmx_writel(pmx, val, g->mux_bank, g->mux_reg);
 276
 277         return 0;
 278 }
 279
 280 static const struct tegra_pingroup *tegra_pinctrl_get_group(struct pinctrl_dev *pctldev,
 281                                         unsigned int offset)
 282 {
 283         struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
 284         unsigned int group, num_pins, j;
 285         const unsigned int *pins;
 286         int ret;
 287
 288         for (group = 0; group < pmx->soc->ngroups; ++group) {
 289                 ret = tegra_pinctrl_get_group_pins(pctldev, group, &pins, &num_pins);
 290                 if (ret < 0)
 291                         continue;
 292                 for (j = 0; j < num_pins; j++) {
 293                         if (offset == pins[j])
 294                                 return &pmx->soc->groups[group];
 295                 }
 296         }
 297
 298         dev_err(pctldev->dev, "Pingroup not found for pin %u\n", offset);
 299         return NULL;
 300 }
 301
 302 static int tegra_pinctrl_gpio_request_enable(struct pinctrl_dev *pctldev,
 303                                              struct pinctrl_gpio_range *range,
 304                                              unsigned int offset)
 305 {
 306         struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
 307         const struct tegra_pingroup *group;
 308         u32 value;
 309
 310         if (!pmx->soc->sfsel_in_mux)
 311                 return 0;
 312
 313         group = tegra_pinctrl_get_group(pctldev, offset);
 314
 315         if (!group)
 316                 return -EINVAL;
 317
 318         if (group->mux_reg < 0 || group->sfsel_bit < 0)
 319                 return -EINVAL;
 320
 321         value = pmx_readl(pmx, group->mux_bank, group->mux_reg);
 322         value &= ~BIT(group->sfsel_bit);
 323         pmx_writel(pmx, value, group->mux_bank, group->mux_reg);
 324
 325         return 0;
 326 }
 327
 328 static void tegra_pinctrl_gpio_disable_free(struct pinctrl_dev *pctldev,
 329                                             struct pinctrl_gpio_range *range,
 330                                             unsigned int offset)
 331 {
 332         struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
 333         const struct tegra_pingroup *group;
 334         u32 value;
 335
 336         if (!pmx->soc->sfsel_in_mux)
 337                 return;
 338
 339         group = tegra_pinctrl_get_group(pctldev, offset);
 340
 341         if (!group)
 342                 return;
 343
 344         if (group->mux_reg < 0 || group->sfsel_bit < 0)
 345                 return;
 346
 347         value = pmx_readl(pmx, group->mux_bank, group->mux_reg);
 348         value |= BIT(group->sfsel_bit);
 349         pmx_writel(pmx, value, group->mux_bank, group->mux_reg);
 350 }
 351
 352 static const struct pinmux_ops tegra_pinmux_ops = {
 353         .get_functions_count = tegra_pinctrl_get_funcs_count,
 354         .get_function_name = tegra_pinctrl_get_func_name,
 355         .get_function_groups = tegra_pinctrl_get_func_groups,
 356         .set_mux = tegra_pinctrl_set_mux,
 357         .gpio_request_enable = tegra_pinctrl_gpio_request_enable,
 358         .gpio_disable_free = tegra_pinctrl_gpio_disable_free,
 359 };
 360
 361 static int tegra_pinconf_reg(struct tegra_pmx *pmx,
 362                              const struct tegra_pingroup *g,
 363                              enum tegra_pinconf_param param,
 364                              bool report_err,
 365                              s8 *bank, s32 *reg, s8 *bit, s8 *width)
 366 {
 367         switch (param) {
 368         case TEGRA_PINCONF_PARAM_PULL:
 369                 *bank = g->pupd_bank;
 370                 *reg = g->pupd_reg;
 371                 *bit = g->pupd_bit;
 372                 *width = 2;
 373                 break;
 374         case TEGRA_PINCONF_PARAM_TRISTATE:
 375                 *bank = g->tri_bank;
 376                 *reg = g->tri_reg;
 377                 *bit = g->tri_bit;
 378                 *width = 1;
 379                 break;
 380         case TEGRA_PINCONF_PARAM_ENABLE_INPUT:
 381                 *bank = g->mux_bank;
 382                 *reg = g->mux_reg;
 383                 *bit = g->einput_bit;
 384                 *width = 1;
 385                 break;
 386         case TEGRA_PINCONF_PARAM_OPEN_DRAIN:
 387                 *bank = g->mux_bank;
 388                 *reg = g->mux_reg;
 389                 *bit = g->odrain_bit;
 390                 *width = 1;
 391                 break;
 392         case TEGRA_PINCONF_PARAM_LOCK:
 393                 *bank = g->mux_bank;
 394                 *reg = g->mux_reg;
 395                 *bit = g->lock_bit;
 396                 *width = 1;
 397                 break;
 398         case TEGRA_PINCONF_PARAM_IORESET:
 399                 *bank = g->mux_bank;
 400                 *reg = g->mux_reg;
 401                 *bit = g->ioreset_bit;
 402                 *width = 1;
 403                 break;
 404         case TEGRA_PINCONF_PARAM_RCV_SEL:
 405                 *bank = g->mux_bank;
 406                 *reg = g->mux_reg;
 407                 *bit = g->rcv_sel_bit;
 408                 *width = 1;
 409                 break;
 410         case TEGRA_PINCONF_PARAM_HIGH_SPEED_MODE:
 411                 if (pmx->soc->hsm_in_mux) {
 412                         *bank = g->mux_bank;
 413                         *reg = g->mux_reg;
 414                 } else {
 415                         *bank = g->drv_bank;
 416                         *reg = g->drv_reg;
 417                 }
 418                 *bit = g->hsm_bit;
 419                 *width = 1;
 420                 break;
 421         case TEGRA_PINCONF_PARAM_SCHMITT:
 422                 if (pmx->soc->schmitt_in_mux) {
 423                         *bank = g->mux_bank;
 424                         *reg = g->mux_reg;
 425                 } else {
 426                         *bank = g->drv_bank;
 427                         *reg = g->drv_reg;
 428                 }
 429                 *bit = g->schmitt_bit;
 430                 *width = 1;
 431                 break;
 432         case TEGRA_PINCONF_PARAM_LOW_POWER_MODE:
 433                 *bank = g->drv_bank;
 434                 *reg = g->drv_reg;
 435                 *bit = g->lpmd_bit;
 436                 *width = 2;
 437                 break;
 438         case TEGRA_PINCONF_PARAM_DRIVE_DOWN_STRENGTH:
 439                 *bank = g->drv_bank;
 440                 *reg = g->drv_reg;
 441                 *bit = g->drvdn_bit;
 442                 *width = g->drvdn_width;
 443                 break;
 444         case TEGRA_PINCONF_PARAM_DRIVE_UP_STRENGTH:
 445                 *bank = g->drv_bank;
 446                 *reg = g->drv_reg;
 447                 *bit = g->drvup_bit;
 448                 *width = g->drvup_width;
 449                 break;
 450         case TEGRA_PINCONF_PARAM_SLEW_RATE_FALLING:
 451                 *bank = g->drv_bank;
 452                 *reg = g->drv_reg;
 453                 *bit = g->slwf_bit;
 454                 *width = g->slwf_width;
 455                 break;
 456         case TEGRA_PINCONF_PARAM_SLEW_RATE_RISING:
 457                 *bank = g->drv_bank;
 458                 *reg = g->drv_reg;
 459                 *bit = g->slwr_bit;
 460                 *width = g->slwr_width;
 461                 break;
 462         case TEGRA_PINCONF_PARAM_DRIVE_TYPE:
 463                 if (pmx->soc->drvtype_in_mux) {
 464                         *bank = g->mux_bank;
 465                         *reg = g->mux_reg;
 466                 } else {
 467                         *bank = g->drv_bank;
 468                         *reg = g->drv_reg;
 469                 }
 470                 *bit = g->drvtype_bit;
 471                 *width = 2;
 472                 break;
 473         default:
 474                 dev_err(pmx->dev, "Invalid config param %04x\n", param);
 475                 return -ENOTSUPP;
 476         }
 477
 478         if (*reg < 0 || *bit < 0)  {
 479                 if (report_err) {
 480                         const char *prop = "unknown";
 481                         int i;
 482
 483                         for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
 484                                 if (cfg_params[i].param == param) {
 485                                         prop = cfg_params[i].property;
 486                                         break;
 487                                 }
 488                         }
 489
 490                         dev_err(pmx->dev,
 491                                 "Config param %04x (%s) not supported on group %s\n",
 492                                 param, prop, g->name);
 493                 }
 494                 return -ENOTSUPP;
 495         }
 496
 497         return 0;
 498 }
 499
 500 static int tegra_pinconf_get(struct pinctrl_dev *pctldev,
 501                              unsigned pin, unsigned long *config)
 502 {
 503         dev_err(pctldev->dev, "pin_config_get op not supported\n");
 504         return -ENOTSUPP;
 505 }
 506
 507 static int tegra_pinconf_set(struct pinctrl_dev *pctldev,
 508                              unsigned pin, unsigned long *configs,
 509                              unsigned num_configs)
 510 {
 511         dev_err(pctldev->dev, "pin_config_set op not supported\n");
 512         return -ENOTSUPP;
 513 }
 514
 515 static int tegra_pinconf_group_get(struct pinctrl_dev *pctldev,
 516                                    unsigned group, unsigned long *config)
 517 {
 518         struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
 519         enum tegra_pinconf_param param = TEGRA_PINCONF_UNPACK_PARAM(*config);
 520         u16 arg;
 521         const struct tegra_pingroup *g;
 522         int ret;
 523         s8 bank, bit, width;
 524         s32 reg;
 525         u32 val, mask;
 526
 527         g = &pmx->soc->groups[group];
 528
 529         ret = tegra_pinconf_reg(pmx, g, param, true, &bank, &reg, &bit,
 530                                 &width);
 531         if (ret < 0)
 532                 return ret;
 533
 534         val = pmx_readl(pmx, bank, reg);
 535         mask = (1 << width) - 1;
 536         arg = (val >> bit) & mask;
 537
 538         *config = TEGRA_PINCONF_PACK(param, arg);
 539
 540         return 0;
 541 }
 542
 543 static int tegra_pinconf_group_set(struct pinctrl_dev *pctldev,
 544                                    unsigned group, unsigned long *configs,
 545                                    unsigned num_configs)
 546 {
 547         struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
 548         enum tegra_pinconf_param param;
 549         u16 arg;
 550         const struct tegra_pingroup *g;
 551         int ret, i;
 552         s8 bank, bit, width;
 553         s32 reg;
 554         u32 val, mask;
 555
 556         g = &pmx->soc->groups[group];
 557
 558         for (i = 0; i < num_configs; i++) {
 559                 param = TEGRA_PINCONF_UNPACK_PARAM(configs[i]);
 560                 arg = TEGRA_PINCONF_UNPACK_ARG(configs[i]);
 561
 562                 ret = tegra_pinconf_reg(pmx, g, param, true, &bank, &reg, &bit,
 563                                         &width);
 564                 if (ret < 0)
 565                         return ret;
 566
 567                 val = pmx_readl(pmx, bank, reg);
 568
 569                 /* LOCK can't be cleared */
 570                 if (param == TEGRA_PINCONF_PARAM_LOCK) {
 571                         if ((val & BIT(bit)) && !arg) {
 572                                 dev_err(pctldev->dev, "LOCK bit cannot be cleared\n");
 573                                 return -EINVAL;
 574                         }
 575                 }
 576
 577                 /* Special-case Boolean values; allow any non-zero as true */
 578                 if (width == 1)
 579                         arg = !!arg;
 580
 581                 /* Range-check user-supplied value */
 582                 mask = (1 << width) - 1;
 583                 if (arg & ~mask) {
 584                         dev_err(pctldev->dev,
 585                                 "config %lx: %x too big for %d bit register\n",
 586                                 configs[i], arg, width);
 587                         return -EINVAL;
 588                 }
 589
 590                 /* Update register */
 591                 val &= ~(mask << bit);
 592                 val |= arg << bit;
 593                 pmx_writel(pmx, val, bank, reg);
 594         } /* for each config */
 595
 596         return 0;
 597 }
 598
 599 #ifdef CONFIG_DEBUG_FS
 600 static void tegra_pinconf_dbg_show(struct pinctrl_dev *pctldev,
 601                                    struct seq_file *s, unsigned offset)
 602 {
 603 }
 604
 605 static const char *strip_prefix(const char *s)
 606 {
 607         const char *comma = strchr(s, ',');
 608         if (!comma)
 609                 return s;
 610
 611         return comma + 1;
 612 }
 613
 614 static void tegra_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
 615                                          struct seq_file *s, unsigned group)
 616 {
 617         struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
 618         const struct tegra_pingroup *g;
 619         int i, ret;
 620         s8 bank, bit, width;
 621         s32 reg;
 622         u32 val;
 623
 624         g = &pmx->soc->groups[group];
 625
 626         for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
 627                 ret = tegra_pinconf_reg(pmx, g, cfg_params[i].param, false,
 628                                         &bank, &reg, &bit, &width);
 629                 if (ret < 0)
 630                         continue;
 631
 632                 val = pmx_readl(pmx, bank, reg);
 633                 val >>= bit;
 634                 val &= (1 << width) - 1;
 635
 636                 seq_printf(s, "\n\t%s=%u",
 637                            strip_prefix(cfg_params[i].property), val);
 638         }
 639
 640         if (g->mux_reg >= 0) {
 641                 /* read pinmux function and dump to seq_file */
 642                 val = pmx_readl(pmx, g->mux_bank, g->mux_reg);
 643                 val = g->funcs[(val >> g->mux_bit) & 0x3];
 644
 645                 seq_printf(s, "\n\tfunction=%s", pmx->functions[val].name);
 646         }
 647 }
 648
 649 static void tegra_pinconf_config_dbg_show(struct pinctrl_dev *pctldev,
 650                                           struct seq_file *s,
 651                                           unsigned long config)
 652 {
 653         enum tegra_pinconf_param param = TEGRA_PINCONF_UNPACK_PARAM(config);
 654         u16 arg = TEGRA_PINCONF_UNPACK_ARG(config);
 655         const char *pname = "unknown";
 656         int i;
 657
 658         for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
 659                 if (cfg_params[i].param == param) {
 660                         pname = cfg_params[i].property;
 661                         break;
 662                 }
 663         }
 664
 665         seq_printf(s, "%s=%d", strip_prefix(pname), arg);
 666 }
 667 #endif
 668
 669 static const struct pinconf_ops tegra_pinconf_ops = {
 670         .pin_config_get = tegra_pinconf_get,
 671         .pin_config_set = tegra_pinconf_set,
 672         .pin_config_group_get = tegra_pinconf_group_get,
 673         .pin_config_group_set = tegra_pinconf_group_set,
 674 #ifdef CONFIG_DEBUG_FS
 675         .pin_config_dbg_show = tegra_pinconf_dbg_show,
 676         .pin_config_group_dbg_show = tegra_pinconf_group_dbg_show,
 677         .pin_config_config_dbg_show = tegra_pinconf_config_dbg_show,
 678 #endif
 679 };
 680
 681 static void tegra_pinctrl_clear_parked_bits(struct tegra_pmx *pmx)
 682 {
 683         int i = 0;
 684         const struct tegra_pingroup *g;
 685         u32 val;
 686
 687         for (i = 0; i < pmx->soc->ngroups; ++i) {
 688                 g = &pmx->soc->groups[i];
 689                 if (g->parked_bitmask > 0) {
 690                         unsigned int bank, reg;
 691
 692                         if (g->mux_reg != -1) {
 693                                 bank = g->mux_bank;
 694                                 reg = g->mux_reg;
 695                         } else {
 696                                 bank = g->drv_bank;
 697                                 reg = g->drv_reg;
 698                         }
 699
 700                         val = pmx_readl(pmx, bank, reg);
 701                         val &= ~g->parked_bitmask;
 702                         pmx_writel(pmx, val, bank, reg);
 703                 }
 704         }
 705 }
 706
 707 static size_t tegra_pinctrl_get_bank_size(struct device *dev,
 708                                           unsigned int bank_id)
 709 {
 710         struct platform_device *pdev = to_platform_device(dev);
 711         struct resource *res;
 712
 713         res = platform_get_resource(pdev, IORESOURCE_MEM, bank_id);
 714
 715         return resource_size(res) / 4;
 716 }
 717
 718 static int tegra_pinctrl_suspend(struct device *dev)
 719 {
 720         struct tegra_pmx *pmx = dev_get_drvdata(dev);
 721         u32 *backup_regs = pmx->backup_regs;
 722         u32 __iomem *regs;
 723         size_t bank_size;
 724         unsigned int i, k;
 725
 726         for (i = 0; i < pmx->nbanks; i++) {
 727                 bank_size = tegra_pinctrl_get_bank_size(dev, i);
 728                 regs = pmx->regs[i];
 729                 for (k = 0; k < bank_size; k++)
 730                         *backup_regs++ = readl_relaxed(regs++);
 731         }
 732
 733         return pinctrl_force_sleep(pmx->pctl);
 734 }
 735
 736 static int tegra_pinctrl_resume(struct device *dev)
 737 {
 738         struct tegra_pmx *pmx = dev_get_drvdata(dev);
 739         u32 *backup_regs = pmx->backup_regs;
 740         u32 __iomem *regs;
 741         size_t bank_size;
 742         unsigned int i, k;
 743
 744         for (i = 0; i < pmx->nbanks; i++) {
 745                 bank_size = tegra_pinctrl_get_bank_size(dev, i);
 746                 regs = pmx->regs[i];
 747                 for (k = 0; k < bank_size; k++)
 748                         writel_relaxed(*backup_regs++, regs++);
 749         }
 750
 751         /* flush all the prior writes */
 752         readl_relaxed(pmx->regs[0]);
 753         /* wait for pinctrl register read to complete */
 754         rmb();
 755         return 0;
 756 }
 757
 758 DEFINE_NOIRQ_DEV_PM_OPS(tegra_pinctrl_pm, tegra_pinctrl_suspend, tegra_pinctrl_resume);
 759
 760 static bool tegra_pinctrl_gpio_node_has_range(struct tegra_pmx *pmx)
 761 {
 762         struct device_node *np;
 763         bool has_prop = false;
 764
 765         np = of_find_compatible_node(NULL, NULL, pmx->soc->gpio_compatible);
 766         if (!np)
 767                 return has_prop;
 768
 769         has_prop = of_find_property(np, "gpio-ranges", NULL);
 770
 771         of_node_put(np);
 772
 773         return has_prop;
 774 }
 775
 776 int tegra_pinctrl_probe(struct platform_device *pdev,
 777                         const struct tegra_pinctrl_soc_data *soc_data)
 778 {
 779         struct tegra_pmx *pmx;
 780         struct resource *res;
 781         int i;
 782         const char **group_pins;
 783         int fn, gn, gfn;
 784         unsigned long backup_regs_size = 0;
 785
 786         pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
 787         if (!pmx)
 788                 return -ENOMEM;
 789
 790         pmx->dev = &pdev->dev;
 791         pmx->soc = soc_data;
 792
 793         /*
 794          * Each mux group will appear in 4 functions' list of groups.
 795          * This over-allocates slightly, since not all groups are mux groups.
 796          */
 797         pmx->group_pins = devm_kcalloc(&pdev->dev, pmx->soc->ngroups * 4,
 798                                        sizeof(*pmx->group_pins), GFP_KERNEL);
 799         if (!pmx->group_pins)
 800                 return -ENOMEM;
 801
 802         pmx->functions = devm_kcalloc(&pdev->dev, pmx->soc->nfunctions,
 803                                       sizeof(*pmx->functions), GFP_KERNEL);
 804         if (!pmx->functions)
 805                 return -ENOMEM;
 806
 807         group_pins = pmx->group_pins;
 808
 809         for (fn = 0; fn < pmx->soc->nfunctions; fn++) {
 810                 struct tegra_function *func = &pmx->functions[fn];
 811
 812                 func->name = pmx->soc->functions[fn];
 813                 func->groups = group_pins;
 814
 815                 for (gn = 0; gn < pmx->soc->ngroups; gn++) {
 816                         const struct tegra_pingroup *g = &pmx->soc->groups[gn];
 817
 818                         if (g->mux_reg == -1)
 819                                 continue;
 820
 821                         for (gfn = 0; gfn < 4; gfn++)
 822                                 if (g->funcs[gfn] == fn)
 823                                         break;
 824                         if (gfn == 4)
 825                                 continue;
 826
 827                         BUG_ON(group_pins - pmx->group_pins >=
 828                                 pmx->soc->ngroups * 4);
 829                         *group_pins++ = g->name;
 830                         func->ngroups++;
 831                 }
 832         }
 833
 834         pmx->gpio_range.name = "Tegra GPIOs";
 835         pmx->gpio_range.id = 0;
 836         pmx->gpio_range.base = 0;
 837         pmx->gpio_range.npins = pmx->soc->ngpios;
 838
 839         pmx->desc.pctlops = &tegra_pinctrl_ops;
 840         pmx->desc.pmxops = &tegra_pinmux_ops;
 841         pmx->desc.confops = &tegra_pinconf_ops;
 842         pmx->desc.owner = THIS_MODULE;
 843         pmx->desc.name = dev_name(&pdev->dev);
 844         pmx->desc.pins = pmx->soc->pins;
 845         pmx->desc.npins = pmx->soc->npins;
 846
 847         for (i = 0; ; i++) {
 848                 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
 849                 if (!res)
 850                         break;
 851                 backup_regs_size += resource_size(res);
 852         }
 853         pmx->nbanks = i;
 854
 855         pmx->regs = devm_kcalloc(&pdev->dev, pmx->nbanks, sizeof(*pmx->regs),
 856                                  GFP_KERNEL);
 857         if (!pmx->regs)
 858                 return -ENOMEM;
 859
 860         pmx->backup_regs = devm_kzalloc(&pdev->dev, backup_regs_size,
 861                                         GFP_KERNEL);
 862         if (!pmx->backup_regs)
 863                 return -ENOMEM;
 864
 865         for (i = 0; i < pmx->nbanks; i++) {
 866                 pmx->regs[i] = devm_platform_ioremap_resource(pdev, i);
 867                 if (IS_ERR(pmx->regs[i]))
 868                         return PTR_ERR(pmx->regs[i]);
 869         }
 870
 871         pmx->pctl = devm_pinctrl_register(&pdev->dev, &pmx->desc, pmx);
 872         if (IS_ERR(pmx->pctl)) {
 873                 dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
 874                 return PTR_ERR(pmx->pctl);
 875         }
 876
 877         tegra_pinctrl_clear_parked_bits(pmx);
 878
 879         if (pmx->soc->ngpios > 0 && !tegra_pinctrl_gpio_node_has_range(pmx))
 880                 pinctrl_add_gpio_range(pmx->pctl, &pmx->gpio_range);
 881
 882         platform_set_drvdata(pdev, pmx);
 883
 884         dev_dbg(&pdev->dev, "Probed Tegra pinctrl driver\n");
 885
 886         return 0;
 887 }