drivers/pinctrl/mediatek/pinctrl-paris.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * MediaTek Pinctrl Paris Driver, which implement the vendor per-pin
   4  * bindings for MediaTek SoC.
   5  *
   6  * Copyright (C) 2018 MediaTek Inc.
   7  * Author: Sean Wang <sean.wang@mediatek.com>
   8  *         Zhiyong Tao <zhiyong.tao@mediatek.com>
   9  *         Hongzhou.Yang <hongzhou.yang@mediatek.com>
  10  */
  11
  12 #include <linux/gpio/driver.h>
  13 #include <linux/module.h>
  14 #include <linux/seq_file.h>
  15
  16 #include <linux/pinctrl/consumer.h>
  17
  18 #include <dt-bindings/pinctrl/mt65xx.h>
  19
  20 #include "pinctrl-paris.h"
  21
  22 #define PINCTRL_PINCTRL_DEV     KBUILD_MODNAME
  23
  24 /* Custom pinconf parameters */
  25 #define MTK_PIN_CONFIG_TDSEL    (PIN_CONFIG_END + 1)
  26 #define MTK_PIN_CONFIG_RDSEL    (PIN_CONFIG_END + 2)
  27 #define MTK_PIN_CONFIG_PU_ADV   (PIN_CONFIG_END + 3)
  28 #define MTK_PIN_CONFIG_PD_ADV   (PIN_CONFIG_END + 4)
  29 #define MTK_PIN_CONFIG_DRV_ADV  (PIN_CONFIG_END + 5)
  30
  31 static const struct pinconf_generic_params mtk_custom_bindings[] = {
  32         {"mediatek,tdsel",      MTK_PIN_CONFIG_TDSEL,           0},
  33         {"mediatek,rdsel",      MTK_PIN_CONFIG_RDSEL,           0},
  34         {"mediatek,pull-up-adv", MTK_PIN_CONFIG_PU_ADV,         1},
  35         {"mediatek,pull-down-adv", MTK_PIN_CONFIG_PD_ADV,       1},
  36         {"mediatek,drive-strength-adv", MTK_PIN_CONFIG_DRV_ADV, 2},
  37 };
  38
  39 #ifdef CONFIG_DEBUG_FS
  40 static const struct pin_config_item mtk_conf_items[] = {
  41         PCONFDUMP(MTK_PIN_CONFIG_TDSEL, "tdsel", NULL, true),
  42         PCONFDUMP(MTK_PIN_CONFIG_RDSEL, "rdsel", NULL, true),
  43         PCONFDUMP(MTK_PIN_CONFIG_PU_ADV, "pu-adv", NULL, true),
  44         PCONFDUMP(MTK_PIN_CONFIG_PD_ADV, "pd-adv", NULL, true),
  45         PCONFDUMP(MTK_PIN_CONFIG_DRV_ADV, "drive-strength-adv", NULL, true),
  46 };
  47 #endif
  48
  49 static const char * const mtk_gpio_functions[] = {
  50         "func0", "func1", "func2", "func3",
  51         "func4", "func5", "func6", "func7",
  52         "func8", "func9", "func10", "func11",
  53         "func12", "func13", "func14", "func15",
  54 };
  55
  56 /*
  57  * This section supports converting to/from custom MTK_PIN_CONFIG_DRV_ADV
  58  * and standard PIN_CONFIG_DRIVE_STRENGTH_UA pin configs.
  59  *
  60  * The custom value encodes three hardware bits as follows:
  61  *
  62  *   |           Bits           |
  63  *   | 2 (E1) | 1 (E0) | 0 (EN) | drive strength (uA)
  64  *   ------------------------------------------------
  65  *   |    x   |    x   |    0   | disabled, use standard drive strength
  66  *   -------------------------------------
  67  *   |    0   |    0   |    1   |  125 uA
  68  *   |    0   |    1   |    1   |  250 uA
  69  *   |    1   |    0   |    1   |  500 uA
  70  *   |    1   |    1   |    1   | 1000 uA
  71  */
  72 static const int mtk_drv_adv_uA[] = { 125, 250, 500, 1000 };
  73
  74 static int mtk_drv_adv_to_uA(int val)
  75 {
  76         /* This should never happen. */
  77         if (WARN_ON_ONCE(val < 0 || val > 7))
  78                 return -EINVAL;
  79
  80         /* Bit 0 simply enables this hardware part */
  81         if (!(val & BIT(0)))
  82                 return -EINVAL;
  83
  84         return mtk_drv_adv_uA[(val >> 1)];
  85 }
  86
  87 static int mtk_drv_uA_to_adv(int val)
  88 {
  89         switch (val) {
  90         case 125:
  91                 return 0x1;
  92         case 250:
  93                 return 0x3;
  94         case 500:
  95                 return 0x5;
  96         case 1000:
  97                 return 0x7;
  98         }
  99
 100         return -EINVAL;
 101 }
 102
 103 static int mtk_pinmux_gpio_request_enable(struct pinctrl_dev *pctldev,
 104                                           struct pinctrl_gpio_range *range,
 105                                           unsigned int pin)
 106 {
 107         struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
 108         const struct mtk_pin_desc *desc;
 109
 110         desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
 111
 112         return mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_MODE,
 113                                 hw->soc->gpio_m);
 114 }
 115
 116 static int mtk_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
 117                                          struct pinctrl_gpio_range *range,
 118                                          unsigned int pin, bool input)
 119 {
 120         struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
 121         const struct mtk_pin_desc *desc;
 122
 123         desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
 124
 125         /* hardware would take 0 as input direction */
 126         return mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, !input);
 127 }
 128
 129 static int mtk_pinconf_get(struct pinctrl_dev *pctldev,
 130                            unsigned int pin, unsigned long *config)
 131 {
 132         struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
 133         u32 param = pinconf_to_config_param(*config);
 134         int pullup, reg, err = -ENOTSUPP, ret = 1;
 135         const struct mtk_pin_desc *desc;
 136
 137         if (pin >= hw->soc->npins)
 138                 return -EINVAL;
 139
 140         desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
 141
 142         switch (param) {
 143         case PIN_CONFIG_BIAS_DISABLE:
 144         case PIN_CONFIG_BIAS_PULL_UP:
 145         case PIN_CONFIG_BIAS_PULL_DOWN:
 146                 if (!hw->soc->bias_get_combo)
 147                         break;
 148                 err = hw->soc->bias_get_combo(hw, desc, &pullup, &ret);
 149                 if (err)
 150                         break;
 151                 if (ret == MTK_PUPD_SET_R1R0_00)
 152                         ret = MTK_DISABLE;
 153                 if (param == PIN_CONFIG_BIAS_DISABLE) {
 154                         if (ret != MTK_DISABLE)
 155                                 err = -EINVAL;
 156                 } else if (param == PIN_CONFIG_BIAS_PULL_UP) {
 157                         if (!pullup || ret == MTK_DISABLE)
 158                                 err = -EINVAL;
 159                 } else if (param == PIN_CONFIG_BIAS_PULL_DOWN) {
 160                         if (pullup || ret == MTK_DISABLE)
 161                                 err = -EINVAL;
 162                 }
 163                 break;
 164         case PIN_CONFIG_SLEW_RATE:
 165                 err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_SR, &ret);
 166                 break;
 167         case PIN_CONFIG_INPUT_ENABLE:
 168         case PIN_CONFIG_OUTPUT_ENABLE:
 169                 err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &ret);
 170                 if (err)
 171                         break;
 172                 /*     CONFIG     Current direction return value
 173                  * -------------  ----------------- ----------------------
 174                  * OUTPUT_ENABLE       output       1 (= HW value)
 175                  *                     input        0 (= HW value)
 176                  * INPUT_ENABLE        output       0 (= reverse HW value)
 177                  *                     input        1 (= reverse HW value)
 178                  */
 179                 if (param == PIN_CONFIG_INPUT_ENABLE)
 180                         ret = !ret;
 181
 182                 break;
 183         case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
 184                 err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &ret);
 185                 if (err)
 186                         break;
 187                 /* return error when in output mode
 188                  * because schmitt trigger only work in input mode
 189                  */
 190                 if (ret) {
 191                         err = -EINVAL;
 192                         break;
 193                 }
 194
 195                 err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_SMT, &ret);
 196                 break;
 197         case PIN_CONFIG_DRIVE_STRENGTH:
 198                 if (!hw->soc->drive_get)
 199                         break;
 200
 201                 if (hw->soc->adv_drive_get) {
 202                         err = hw->soc->adv_drive_get(hw, desc, &ret);
 203                         if (!err) {
 204                                 err = mtk_drv_adv_to_uA(ret);
 205                                 if (err > 0) {
 206                                         /* PIN_CONFIG_DRIVE_STRENGTH_UA used */
 207                                         err = -EINVAL;
 208                                         break;
 209                                 }
 210                         }
 211                 }
 212
 213                 err = hw->soc->drive_get(hw, desc, &ret);
 214                 break;
 215         case PIN_CONFIG_DRIVE_STRENGTH_UA:
 216                 if (!hw->soc->adv_drive_get)
 217                         break;
 218
 219                 err = hw->soc->adv_drive_get(hw, desc, &ret);
 220                 if (err)
 221                         break;
 222                 err = mtk_drv_adv_to_uA(ret);
 223                 if (err < 0)
 224                         break;
 225
 226                 ret = err;
 227                 err = 0;
 228                 break;
 229         case MTK_PIN_CONFIG_TDSEL:
 230         case MTK_PIN_CONFIG_RDSEL:
 231                 reg = (param == MTK_PIN_CONFIG_TDSEL) ?
 232                        PINCTRL_PIN_REG_TDSEL : PINCTRL_PIN_REG_RDSEL;
 233                 err = mtk_hw_get_value(hw, desc, reg, &ret);
 234                 break;
 235         case MTK_PIN_CONFIG_PU_ADV:
 236         case MTK_PIN_CONFIG_PD_ADV:
 237                 if (!hw->soc->adv_pull_get)
 238                         break;
 239                 pullup = param == MTK_PIN_CONFIG_PU_ADV;
 240                 err = hw->soc->adv_pull_get(hw, desc, pullup, &ret);
 241                 break;
 242         case MTK_PIN_CONFIG_DRV_ADV:
 243                 if (!hw->soc->adv_drive_get)
 244                         break;
 245                 err = hw->soc->adv_drive_get(hw, desc, &ret);
 246                 break;
 247         }
 248
 249         if (!err)
 250                 *config = pinconf_to_config_packed(param, ret);
 251
 252         return err;
 253 }
 254
 255 static int mtk_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
 256                            enum pin_config_param param, u32 arg)
 257 {
 258         struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
 259         const struct mtk_pin_desc *desc;
 260         int err = -ENOTSUPP;
 261         u32 reg;
 262
 263         if (pin >= hw->soc->npins)
 264                 return -EINVAL;
 265
 266         desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
 267
 268         switch ((u32)param) {
 269         case PIN_CONFIG_BIAS_DISABLE:
 270                 if (!hw->soc->bias_set_combo)
 271                         break;
 272                 err = hw->soc->bias_set_combo(hw, desc, 0, MTK_DISABLE);
 273                 break;
 274         case PIN_CONFIG_BIAS_PULL_UP:
 275                 if (!hw->soc->bias_set_combo)
 276                         break;
 277                 err = hw->soc->bias_set_combo(hw, desc, 1, arg);
 278                 break;
 279         case PIN_CONFIG_BIAS_PULL_DOWN:
 280                 if (!hw->soc->bias_set_combo)
 281                         break;
 282                 err = hw->soc->bias_set_combo(hw, desc, 0, arg);
 283                 break;
 284         case PIN_CONFIG_OUTPUT_ENABLE:
 285                 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT,
 286                                        MTK_DISABLE);
 287                 /* Keep set direction to consider the case that a GPIO pin
 288                  *  does not have SMT control
 289                  */
 290                 if (err != -ENOTSUPP)
 291                         break;
 292
 293                 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR,
 294                                        MTK_OUTPUT);
 295                 break;
 296         case PIN_CONFIG_INPUT_ENABLE:
 297                 /* regard all non-zero value as enable */
 298                 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_IES, !!arg);
 299                 if (err)
 300                         break;
 301
 302                 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR,
 303                                        MTK_INPUT);
 304                 break;
 305         case PIN_CONFIG_SLEW_RATE:
 306                 /* regard all non-zero value as enable */
 307                 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SR, !!arg);
 308                 break;
 309         case PIN_CONFIG_OUTPUT:
 310                 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DO,
 311                                        arg);
 312                 if (err)
 313                         break;
 314
 315                 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR,
 316                                        MTK_OUTPUT);
 317                 break;
 318         case PIN_CONFIG_INPUT_SCHMITT:
 319         case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
 320                 /* arg = 1: Input mode & SMT enable ;
 321                  * arg = 0: Output mode & SMT disable
 322                  */
 323                 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, !arg);
 324                 if (err)
 325                         break;
 326
 327                 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT, !!arg);
 328                 break;
 329         case PIN_CONFIG_DRIVE_STRENGTH:
 330                 if (!hw->soc->drive_set)
 331                         break;
 332                 err = hw->soc->drive_set(hw, desc, arg);
 333                 break;
 334         case PIN_CONFIG_DRIVE_STRENGTH_UA:
 335                 if (!hw->soc->adv_drive_set)
 336                         break;
 337
 338                 err = mtk_drv_uA_to_adv(arg);
 339                 if (err < 0)
 340                         break;
 341                 err = hw->soc->adv_drive_set(hw, desc, err);
 342                 break;
 343         case MTK_PIN_CONFIG_TDSEL:
 344         case MTK_PIN_CONFIG_RDSEL:
 345                 reg = (param == MTK_PIN_CONFIG_TDSEL) ?
 346                        PINCTRL_PIN_REG_TDSEL : PINCTRL_PIN_REG_RDSEL;
 347                 err = mtk_hw_set_value(hw, desc, reg, arg);
 348                 break;
 349         case MTK_PIN_CONFIG_PU_ADV:
 350         case MTK_PIN_CONFIG_PD_ADV:
 351                 if (!hw->soc->adv_pull_set)
 352                         break;
 353                 err = hw->soc->adv_pull_set(hw, desc,
 354                                             (param == MTK_PIN_CONFIG_PU_ADV),
 355                                             arg);
 356                 break;
 357         case MTK_PIN_CONFIG_DRV_ADV:
 358                 if (!hw->soc->adv_drive_set)
 359                         break;
 360                 err = hw->soc->adv_drive_set(hw, desc, arg);
 361                 break;
 362         }
 363
 364         return err;
 365 }
 366
 367 static struct mtk_pinctrl_group *
 368 mtk_pctrl_find_group_by_pin(struct mtk_pinctrl *hw, u32 pin)
 369 {
 370         int i;
 371
 372         for (i = 0; i < hw->soc->ngrps; i++) {
 373                 struct mtk_pinctrl_group *grp = hw->groups + i;
 374
 375                 if (grp->pin == pin)
 376                         return grp;
 377         }
 378
 379         return NULL;
 380 }
 381
 382 static const struct mtk_func_desc *
 383 mtk_pctrl_find_function_by_pin(struct mtk_pinctrl *hw, u32 pin_num, u32 fnum)
 384 {
 385         const struct mtk_pin_desc *pin = hw->soc->pins + pin_num;
 386         const struct mtk_func_desc *func = pin->funcs;
 387
 388         while (func && func->name) {
 389                 if (func->muxval == fnum)
 390                         return func;
 391                 func++;
 392         }
 393
 394         return NULL;
 395 }
 396
 397 static bool mtk_pctrl_is_function_valid(struct mtk_pinctrl *hw, u32 pin_num,
 398                                         u32 fnum)
 399 {
 400         int i;
 401
 402         for (i = 0; i < hw->soc->npins; i++) {
 403                 const struct mtk_pin_desc *pin = hw->soc->pins + i;
 404
 405                 if (pin->number == pin_num) {
 406                         const struct mtk_func_desc *func = pin->funcs;
 407
 408                         while (func && func->name) {
 409                                 if (func->muxval == fnum)
 410                                         return true;
 411                                 func++;
 412                         }
 413
 414                         break;
 415                 }
 416         }
 417
 418         return false;
 419 }
 420
 421 static int mtk_pctrl_dt_node_to_map_func(struct mtk_pinctrl *pctl,
 422                                          u32 pin, u32 fnum,
 423                                          struct mtk_pinctrl_group *grp,
 424                                          struct pinctrl_map **map,
 425                                          unsigned *reserved_maps,
 426                                          unsigned *num_maps)
 427 {
 428         bool ret;
 429
 430         if (*num_maps == *reserved_maps)
 431                 return -ENOSPC;
 432
 433         (*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
 434         (*map)[*num_maps].data.mux.group = grp->name;
 435
 436         ret = mtk_pctrl_is_function_valid(pctl, pin, fnum);
 437         if (!ret) {
 438                 dev_err(pctl->dev, "invalid function %d on pin %d .\n",
 439                         fnum, pin);
 440                 return -EINVAL;
 441         }
 442
 443         (*map)[*num_maps].data.mux.function = mtk_gpio_functions[fnum];
 444         (*num_maps)++;
 445
 446         return 0;
 447 }
 448
 449 static int mtk_pctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
 450                                        struct device_node *node,
 451                                        struct pinctrl_map **map,
 452                                        unsigned *reserved_maps,
 453                                        unsigned *num_maps)
 454 {
 455         struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
 456         int num_pins, num_funcs, maps_per_pin, i, err;
 457         struct mtk_pinctrl_group *grp;
 458         unsigned int num_configs;
 459         bool has_config = false;
 460         unsigned long *configs;
 461         u32 pinfunc, pin, func;
 462         struct property *pins;
 463         unsigned reserve = 0;
 464
 465         pins = of_find_property(node, "pinmux", NULL);
 466         if (!pins) {
 467                 dev_err(hw->dev, "missing pins property in node %pOFn .\n",
 468                         node);
 469                 return -EINVAL;
 470         }
 471
 472         err = pinconf_generic_parse_dt_config(node, pctldev, &configs,
 473                                               &num_configs);
 474         if (err)
 475                 return err;
 476
 477         if (num_configs)
 478                 has_config = true;
 479
 480         num_pins = pins->length / sizeof(u32);
 481         num_funcs = num_pins;
 482         maps_per_pin = 0;
 483         if (num_funcs)
 484                 maps_per_pin++;
 485         if (has_config && num_pins >= 1)
 486                 maps_per_pin++;
 487
 488         if (!num_pins || !maps_per_pin) {
 489                 err = -EINVAL;
 490                 goto exit;
 491         }
 492
 493         reserve = num_pins * maps_per_pin;
 494
 495         err = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps,
 496                                         reserve);
 497         if (err < 0)
 498                 goto exit;
 499
 500         for (i = 0; i < num_pins; i++) {
 501                 err = of_property_read_u32_index(node, "pinmux", i, &pinfunc);
 502                 if (err)
 503                         goto exit;
 504
 505                 pin = MTK_GET_PIN_NO(pinfunc);
 506                 func = MTK_GET_PIN_FUNC(pinfunc);
 507
 508                 if (pin >= hw->soc->npins ||
 509                     func >= ARRAY_SIZE(mtk_gpio_functions)) {
 510                         dev_err(hw->dev, "invalid pins value.\n");
 511                         err = -EINVAL;
 512                         goto exit;
 513                 }
 514
 515                 grp = mtk_pctrl_find_group_by_pin(hw, pin);
 516                 if (!grp) {
 517                         dev_err(hw->dev, "unable to match pin %d to group\n",
 518                                 pin);
 519                         err = -EINVAL;
 520                         goto exit;
 521                 }
 522
 523                 err = mtk_pctrl_dt_node_to_map_func(hw, pin, func, grp, map,
 524                                                     reserved_maps, num_maps);
 525                 if (err < 0)
 526                         goto exit;
 527
 528                 if (has_config) {
 529                         err = pinctrl_utils_add_map_configs(pctldev, map,
 530                                                             reserved_maps,
 531                                                             num_maps,
 532                                                             grp->name,
 533                                                             configs,
 534                                                             num_configs,
 535                                                             PIN_MAP_TYPE_CONFIGS_GROUP);
 536                         if (err < 0)
 537                                 goto exit;
 538                 }
 539         }
 540
 541         err = 0;
 542
 543 exit:
 544         kfree(configs);
 545         return err;
 546 }
 547
 548 static int mtk_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
 549                                     struct device_node *np_config,
 550                                     struct pinctrl_map **map,
 551                                     unsigned *num_maps)
 552 {
 553         struct device_node *np;
 554         unsigned reserved_maps;
 555         int ret;
 556
 557         *map = NULL;
 558         *num_maps = 0;
 559         reserved_maps = 0;
 560
 561         for_each_child_of_node(np_config, np) {
 562                 ret = mtk_pctrl_dt_subnode_to_map(pctldev, np, map,
 563                                                   &reserved_maps,
 564                                                   num_maps);
 565                 if (ret < 0) {
 566                         pinctrl_utils_free_map(pctldev, *map, *num_maps);
 567                         of_node_put(np);
 568                         return ret;
 569                 }
 570         }
 571
 572         return 0;
 573 }
 574
 575 static int mtk_pctrl_get_groups_count(struct pinctrl_dev *pctldev)
 576 {
 577         struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
 578
 579         return hw->soc->ngrps;
 580 }
 581
 582 static const char *mtk_pctrl_get_group_name(struct pinctrl_dev *pctldev,
 583                                             unsigned group)
 584 {
 585         struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
 586
 587         return hw->groups[group].name;
 588 }
 589
 590 static int mtk_pctrl_get_group_pins(struct pinctrl_dev *pctldev,
 591                                     unsigned group, const unsigned **pins,
 592                                     unsigned *num_pins)
 593 {
 594         struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
 595
 596         *pins = (unsigned *)&hw->groups[group].pin;
 597         *num_pins = 1;
 598
 599         return 0;
 600 }
 601
 602 static int mtk_hw_get_value_wrap(struct mtk_pinctrl *hw, unsigned int gpio, int field)
 603 {
 604         const struct mtk_pin_desc *desc;
 605         int value, err;
 606
 607         if (gpio >= hw->soc->npins)
 608                 return -EINVAL;
 609
 610         desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
 611
 612         err = mtk_hw_get_value(hw, desc, field, &value);
 613         if (err)
 614                 return err;
 615
 616         return value;
 617 }
 618
 619 #define mtk_pctrl_get_pinmux(hw, gpio)                  \
 620         mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_MODE)
 621
 622 #define mtk_pctrl_get_direction(hw, gpio)               \
 623         mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_DIR)
 624
 625 #define mtk_pctrl_get_out(hw, gpio)                     \
 626         mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_DO)
 627
 628 #define mtk_pctrl_get_in(hw, gpio)                      \
 629         mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_DI)
 630
 631 #define mtk_pctrl_get_smt(hw, gpio)                     \
 632         mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_SMT)
 633
 634 #define mtk_pctrl_get_ies(hw, gpio)                     \
 635         mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_IES)
 636
 637 #define mtk_pctrl_get_driving(hw, gpio)                 \
 638         mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_DRV)
 639
 640 ssize_t mtk_pctrl_show_one_pin(struct mtk_pinctrl *hw,
 641         unsigned int gpio, char *buf, unsigned int buf_len)
 642 {
 643         int pinmux, pullup = 0, pullen = 0, len = 0, r1 = -1, r0 = -1, rsel = -1;
 644         const struct mtk_pin_desc *desc;
 645         u32 try_all_type = 0;
 646
 647         if (gpio >= hw->soc->npins)
 648                 return -EINVAL;
 649
 650         if (mtk_is_virt_gpio(hw, gpio))
 651                 return -EINVAL;
 652
 653         desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
 654         pinmux = mtk_pctrl_get_pinmux(hw, gpio);
 655         if (pinmux >= hw->soc->nfuncs)
 656                 pinmux -= hw->soc->nfuncs;
 657
 658         mtk_pinconf_bias_get_combo(hw, desc, &pullup, &pullen);
 659
 660         if (hw->soc->pull_type)
 661                 try_all_type = hw->soc->pull_type[desc->number];
 662
 663         if (hw->rsel_si_unit && (try_all_type & MTK_PULL_RSEL_TYPE)) {
 664                 rsel = pullen;
 665                 pullen = 1;
 666         } else {
 667                 /* Case for: R1R0 */
 668                 if (pullen == MTK_PUPD_SET_R1R0_00) {
 669                         pullen = 0;
 670                         r1 = 0;
 671                         r0 = 0;
 672                 } else if (pullen == MTK_PUPD_SET_R1R0_01) {
 673                         pullen = 1;
 674                         r1 = 0;
 675                         r0 = 1;
 676                 } else if (pullen == MTK_PUPD_SET_R1R0_10) {
 677                         pullen = 1;
 678                         r1 = 1;
 679                         r0 = 0;
 680                 } else if (pullen == MTK_PUPD_SET_R1R0_11) {
 681                         pullen = 1;
 682                         r1 = 1;
 683                         r0 = 1;
 684                 }
 685
 686                 /* Case for: RSEL */
 687                 if (pullen >= MTK_PULL_SET_RSEL_000 &&
 688                     pullen <= MTK_PULL_SET_RSEL_111) {
 689                         rsel = pullen - MTK_PULL_SET_RSEL_000;
 690                         pullen = 1;
 691                 }
 692         }
 693         len += scnprintf(buf + len, buf_len - len,
 694                         "%03d: %1d%1d%1d%1d%02d%1d%1d%1d%1d",
 695                         gpio,
 696                         pinmux,
 697                         mtk_pctrl_get_direction(hw, gpio),
 698                         mtk_pctrl_get_out(hw, gpio),
 699                         mtk_pctrl_get_in(hw, gpio),
 700                         mtk_pctrl_get_driving(hw, gpio),
 701                         mtk_pctrl_get_smt(hw, gpio),
 702                         mtk_pctrl_get_ies(hw, gpio),
 703                         pullen,
 704                         pullup);
 705
 706         if (r1 != -1)
 707                 len += scnprintf(buf + len, buf_len - len, " (%1d %1d)", r1, r0);
 708         else if (rsel != -1)
 709                 len += scnprintf(buf + len, buf_len - len, " (%1d)", rsel);
 710
 711         return len;
 712 }
 713 EXPORT_SYMBOL_GPL(mtk_pctrl_show_one_pin);
 714
 715 #define PIN_DBG_BUF_SZ 96
 716 static void mtk_pctrl_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
 717                           unsigned int gpio)
 718 {
 719         struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
 720         char buf[PIN_DBG_BUF_SZ] = { 0 };
 721
 722         (void)mtk_pctrl_show_one_pin(hw, gpio, buf, PIN_DBG_BUF_SZ);
 723
 724         seq_printf(s, "%s", buf);
 725 }
 726
 727 static const struct pinctrl_ops mtk_pctlops = {
 728         .dt_node_to_map         = mtk_pctrl_dt_node_to_map,
 729         .dt_free_map            = pinctrl_utils_free_map,
 730         .get_groups_count       = mtk_pctrl_get_groups_count,
 731         .get_group_name         = mtk_pctrl_get_group_name,
 732         .get_group_pins         = mtk_pctrl_get_group_pins,
 733         .pin_dbg_show           = mtk_pctrl_dbg_show,
 734 };
 735
 736 static int mtk_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev)
 737 {
 738         return ARRAY_SIZE(mtk_gpio_functions);
 739 }
 740
 741 static const char *mtk_pmx_get_func_name(struct pinctrl_dev *pctldev,
 742                                          unsigned selector)
 743 {
 744         return mtk_gpio_functions[selector];
 745 }
 746
 747 static int mtk_pmx_get_func_groups(struct pinctrl_dev *pctldev,
 748                                    unsigned function,
 749                                    const char * const **groups,
 750                                    unsigned * const num_groups)
 751 {
 752         struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
 753
 754         *groups = hw->grp_names;
 755         *num_groups = hw->soc->ngrps;
 756
 757         return 0;
 758 }
 759
 760 static int mtk_pmx_set_mux(struct pinctrl_dev *pctldev,
 761                            unsigned function,
 762                            unsigned group)
 763 {
 764         struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
 765         struct mtk_pinctrl_group *grp = hw->groups + group;
 766         const struct mtk_func_desc *desc_func;
 767         const struct mtk_pin_desc *desc;
 768         bool ret;
 769
 770         ret = mtk_pctrl_is_function_valid(hw, grp->pin, function);
 771         if (!ret) {
 772                 dev_err(hw->dev, "invalid function %d on group %d .\n",
 773                         function, group);
 774                 return -EINVAL;
 775         }
 776
 777         desc_func = mtk_pctrl_find_function_by_pin(hw, grp->pin, function);
 778         if (!desc_func)
 779                 return -EINVAL;
 780
 781         desc = (const struct mtk_pin_desc *)&hw->soc->pins[grp->pin];
 782         return mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_MODE, desc_func->muxval);
 783 }
 784
 785 static const struct pinmux_ops mtk_pmxops = {
 786         .get_functions_count    = mtk_pmx_get_funcs_cnt,
 787         .get_function_name      = mtk_pmx_get_func_name,
 788         .get_function_groups    = mtk_pmx_get_func_groups,
 789         .set_mux                = mtk_pmx_set_mux,
 790         .gpio_set_direction     = mtk_pinmux_gpio_set_direction,
 791         .gpio_request_enable    = mtk_pinmux_gpio_request_enable,
 792 };
 793
 794 static int mtk_pconf_group_get(struct pinctrl_dev *pctldev, unsigned group,
 795                                unsigned long *config)
 796 {
 797         struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
 798         struct mtk_pinctrl_group *grp = &hw->groups[group];
 799
 800          /* One pin per group only */
 801         return mtk_pinconf_get(pctldev, grp->pin, config);
 802 }
 803
 804 static int mtk_pconf_group_set(struct pinctrl_dev *pctldev, unsigned group,
 805                                unsigned long *configs, unsigned num_configs)
 806 {
 807         struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
 808         struct mtk_pinctrl_group *grp = &hw->groups[group];
 809         bool drive_strength_uA_found = false;
 810         bool adv_drve_strength_found = false;
 811         int i, ret;
 812
 813         for (i = 0; i < num_configs; i++) {
 814                 ret = mtk_pinconf_set(pctldev, grp->pin,
 815                                       pinconf_to_config_param(configs[i]),
 816                                       pinconf_to_config_argument(configs[i]));
 817                 if (ret < 0)
 818                         return ret;
 819
 820                 if (pinconf_to_config_param(configs[i]) == PIN_CONFIG_DRIVE_STRENGTH_UA)
 821                         drive_strength_uA_found = true;
 822                 if (pinconf_to_config_param(configs[i]) == MTK_PIN_CONFIG_DRV_ADV)
 823                         adv_drve_strength_found = true;
 824         }
 825
 826         /*
 827          * Disable advanced drive strength mode if drive-strength-microamp
 828          * is not set. However, mediatek,drive-strength-adv takes precedence
 829          * as its value can explicitly request the mode be enabled or not.
 830          */
 831         if (hw->soc->adv_drive_set && !drive_strength_uA_found &&
 832             !adv_drve_strength_found)
 833                 hw->soc->adv_drive_set(hw, &hw->soc->pins[grp->pin], 0);
 834
 835         return 0;
 836 }
 837
 838 static const struct pinconf_ops mtk_confops = {
 839         .pin_config_get = mtk_pinconf_get,
 840         .pin_config_group_get   = mtk_pconf_group_get,
 841         .pin_config_group_set   = mtk_pconf_group_set,
 842         .is_generic = true,
 843 };
 844
 845 static struct pinctrl_desc mtk_desc = {
 846         .name = PINCTRL_PINCTRL_DEV,
 847         .pctlops = &mtk_pctlops,
 848         .pmxops = &mtk_pmxops,
 849         .confops = &mtk_confops,
 850         .owner = THIS_MODULE,
 851 };
 852
 853 static int mtk_gpio_get_direction(struct gpio_chip *chip, unsigned int gpio)
 854 {
 855         struct mtk_pinctrl *hw = gpiochip_get_data(chip);
 856         const struct mtk_pin_desc *desc;
 857         int value, err;
 858
 859         if (gpio >= hw->soc->npins)
 860                 return -EINVAL;
 861
 862         /*
 863          * "Virtual" GPIOs are always and only used for interrupts
 864          * Since they are only used for interrupts, they are always inputs
 865          */
 866         if (mtk_is_virt_gpio(hw, gpio))
 867                 return 1;
 868
 869         desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
 870
 871         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &value);
 872         if (err)
 873                 return err;
 874
 875         if (value)
 876                 return GPIO_LINE_DIRECTION_OUT;
 877
 878         return GPIO_LINE_DIRECTION_IN;
 879 }
 880
 881 static int mtk_gpio_get(struct gpio_chip *chip, unsigned int gpio)
 882 {
 883         struct mtk_pinctrl *hw = gpiochip_get_data(chip);
 884         const struct mtk_pin_desc *desc;
 885         int value, err;
 886
 887         if (gpio >= hw->soc->npins)
 888                 return -EINVAL;
 889
 890         desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
 891
 892         err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DI, &value);
 893         if (err)
 894                 return err;
 895
 896         return !!value;
 897 }
 898
 899 static void mtk_gpio_set(struct gpio_chip *chip, unsigned int gpio, int value)
 900 {
 901         struct mtk_pinctrl *hw = gpiochip_get_data(chip);
 902         const struct mtk_pin_desc *desc;
 903
 904         if (gpio >= hw->soc->npins)
 905                 return;
 906
 907         desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
 908
 909         mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DO, !!value);
 910 }
 911
 912 static int mtk_gpio_direction_input(struct gpio_chip *chip, unsigned int gpio)
 913 {
 914         struct mtk_pinctrl *hw = gpiochip_get_data(chip);
 915
 916         if (gpio >= hw->soc->npins)
 917                 return -EINVAL;
 918
 919         return pinctrl_gpio_direction_input(chip, gpio);
 920 }
 921
 922 static int mtk_gpio_direction_output(struct gpio_chip *chip, unsigned int gpio,
 923                                      int value)
 924 {
 925         struct mtk_pinctrl *hw = gpiochip_get_data(chip);
 926
 927         if (gpio >= hw->soc->npins)
 928                 return -EINVAL;
 929
 930         mtk_gpio_set(chip, gpio, value);
 931
 932         return pinctrl_gpio_direction_output(chip, gpio);
 933 }
 934
 935 static int mtk_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
 936 {
 937         struct mtk_pinctrl *hw = gpiochip_get_data(chip);
 938         const struct mtk_pin_desc *desc;
 939
 940         if (!hw->eint)
 941                 return -ENOTSUPP;
 942
 943         desc = (const struct mtk_pin_desc *)&hw->soc->pins[offset];
 944
 945         if (desc->eint.eint_n == EINT_NA)
 946                 return -ENOTSUPP;
 947
 948         return mtk_eint_find_irq(hw->eint, desc->eint.eint_n);
 949 }
 950
 951 static int mtk_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
 952                                unsigned long config)
 953 {
 954         struct mtk_pinctrl *hw = gpiochip_get_data(chip);
 955         const struct mtk_pin_desc *desc;
 956         u32 debounce;
 957
 958         desc = (const struct mtk_pin_desc *)&hw->soc->pins[offset];
 959
 960         if (!hw->eint ||
 961             pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE ||
 962             desc->eint.eint_n == EINT_NA)
 963                 return -ENOTSUPP;
 964
 965         debounce = pinconf_to_config_argument(config);
 966
 967         return mtk_eint_set_debounce(hw->eint, desc->eint.eint_n, debounce);
 968 }
 969
 970 static int mtk_build_gpiochip(struct mtk_pinctrl *hw)
 971 {
 972         struct gpio_chip *chip = &hw->chip;
 973         int ret;
 974
 975         chip->label             = PINCTRL_PINCTRL_DEV;
 976         chip->parent            = hw->dev;
 977         chip->request           = gpiochip_generic_request;
 978         chip->free              = gpiochip_generic_free;
 979         chip->get_direction     = mtk_gpio_get_direction;
 980         chip->direction_input   = mtk_gpio_direction_input;
 981         chip->direction_output  = mtk_gpio_direction_output;
 982         chip->get               = mtk_gpio_get;
 983         chip->set               = mtk_gpio_set;
 984         chip->to_irq            = mtk_gpio_to_irq;
 985         chip->set_config        = mtk_gpio_set_config;
 986         chip->base              = -1;
 987         chip->ngpio             = hw->soc->npins;
 988
 989         ret = gpiochip_add_data(chip, hw);
 990         if (ret < 0)
 991                 return ret;
 992
 993         return 0;
 994 }
 995
 996 static int mtk_pctrl_build_state(struct platform_device *pdev)
 997 {
 998         struct mtk_pinctrl *hw = platform_get_drvdata(pdev);
 999         int i;
1000
1001         /* Allocate groups */
1002         hw->groups = devm_kmalloc_array(&pdev->dev, hw->soc->ngrps,
1003                                         sizeof(*hw->groups), GFP_KERNEL);
1004         if (!hw->groups)
1005                 return -ENOMEM;
1006
1007         /* We assume that one pin is one group, use pin name as group name. */
1008         hw->grp_names = devm_kmalloc_array(&pdev->dev, hw->soc->ngrps,
1009                                            sizeof(*hw->grp_names), GFP_KERNEL);
1010         if (!hw->grp_names)
1011                 return -ENOMEM;
1012
1013         for (i = 0; i < hw->soc->npins; i++) {
1014                 const struct mtk_pin_desc *pin = hw->soc->pins + i;
1015                 struct mtk_pinctrl_group *group = hw->groups + i;
1016
1017                 group->name = pin->name;
1018                 group->pin = pin->number;
1019
1020                 hw->grp_names[i] = pin->name;
1021         }
1022
1023         return 0;
1024 }
1025
1026 int mtk_paris_pinctrl_probe(struct platform_device *pdev)
1027 {
1028         struct device *dev = &pdev->dev;
1029         struct pinctrl_pin_desc *pins;
1030         struct mtk_pinctrl *hw;
1031         int err, i;
1032
1033         hw = devm_kzalloc(&pdev->dev, sizeof(*hw), GFP_KERNEL);
1034         if (!hw)
1035                 return -ENOMEM;
1036
1037         platform_set_drvdata(pdev, hw);
1038
1039         hw->soc = device_get_match_data(dev);
1040         if (!hw->soc)
1041                 return -ENOENT;
1042
1043         hw->dev = &pdev->dev;
1044
1045         if (!hw->soc->nbase_names)
1046                 return dev_err_probe(dev, -EINVAL,
1047                         "SoC should be assigned at least one register base\n");
1048
1049         hw->base = devm_kmalloc_array(&pdev->dev, hw->soc->nbase_names,
1050                                       sizeof(*hw->base), GFP_KERNEL);
1051         if (!hw->base)
1052                 return -ENOMEM;
1053
1054         for (i = 0; i < hw->soc->nbase_names; i++) {
1055                 hw->base[i] = devm_platform_ioremap_resource_byname(pdev,
1056                                         hw->soc->base_names[i]);
1057                 if (IS_ERR(hw->base[i]))
1058                         return PTR_ERR(hw->base[i]);
1059         }
1060
1061         hw->nbase = hw->soc->nbase_names;
1062
1063         if (of_find_property(hw->dev->of_node,
1064                              "mediatek,rsel-resistance-in-si-unit", NULL))
1065                 hw->rsel_si_unit = true;
1066         else
1067                 hw->rsel_si_unit = false;
1068
1069         spin_lock_init(&hw->lock);
1070
1071         err = mtk_pctrl_build_state(pdev);
1072         if (err)
1073                 return dev_err_probe(dev, err, "build state failed\n");
1074
1075         /* Copy from internal struct mtk_pin_desc to register to the core */
1076         pins = devm_kmalloc_array(&pdev->dev, hw->soc->npins, sizeof(*pins),
1077                                   GFP_KERNEL);
1078         if (!pins)
1079                 return -ENOMEM;
1080
1081         for (i = 0; i < hw->soc->npins; i++) {
1082                 pins[i].number = hw->soc->pins[i].number;
1083                 pins[i].name = hw->soc->pins[i].name;
1084         }
1085
1086         /* Setup pins descriptions per SoC types */
1087         mtk_desc.pins = (const struct pinctrl_pin_desc *)pins;
1088         mtk_desc.npins = hw->soc->npins;
1089         mtk_desc.num_custom_params = ARRAY_SIZE(mtk_custom_bindings);
1090         mtk_desc.custom_params = mtk_custom_bindings;
1091 #ifdef CONFIG_DEBUG_FS
1092         mtk_desc.custom_conf_items = mtk_conf_items;
1093 #endif
1094
1095         err = devm_pinctrl_register_and_init(&pdev->dev, &mtk_desc, hw,
1096                                              &hw->pctrl);
1097         if (err)
1098                 return err;
1099
1100         err = pinctrl_enable(hw->pctrl);
1101         if (err)
1102                 return err;
1103
1104         err = mtk_build_eint(hw, pdev);
1105         if (err)
1106                 dev_warn(&pdev->dev,
1107                          "Failed to add EINT, but pinctrl still can work\n");
1108
1109         /* Build gpiochip should be after pinctrl_enable is done */
1110         err = mtk_build_gpiochip(hw);
1111         if (err)
1112                 return dev_err_probe(dev, err, "Failed to add gpio_chip\n");
1113
1114         platform_set_drvdata(pdev, hw);
1115
1116         return 0;
1117 }
1118 EXPORT_SYMBOL_GPL(mtk_paris_pinctrl_probe);
1119
1120 static int mtk_paris_pinctrl_suspend(struct device *device)
1121 {
1122         struct mtk_pinctrl *pctl = dev_get_drvdata(device);
1123
1124         return mtk_eint_do_suspend(pctl->eint);
1125 }
1126
1127 static int mtk_paris_pinctrl_resume(struct device *device)
1128 {
1129         struct mtk_pinctrl *pctl = dev_get_drvdata(device);
1130
1131         return mtk_eint_do_resume(pctl->eint);
1132 }
1133
1134 EXPORT_GPL_DEV_SLEEP_PM_OPS(mtk_paris_pinctrl_pm_ops) = {
1135         NOIRQ_SYSTEM_SLEEP_PM_OPS(mtk_paris_pinctrl_suspend, mtk_paris_pinctrl_resume)
1136 };
1137
1138 MODULE_LICENSE("GPL v2");
1139 MODULE_DESCRIPTION("MediaTek Pinctrl Common Driver V2 Paris");