drivers/pinctrl/pinctrl-zynqmp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * ZynqMP pin controller
   4  *
   5  * Copyright (C) 2020, 2021 Xilinx, Inc.
   6  *
   7  * Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@xilinx.com>
   8  * Rajan Vaja <rajan.vaja@xilinx.com>
   9  */
  10
  11 #include <dt-bindings/pinctrl/pinctrl-zynqmp.h>
  12
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/of_address.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/firmware/xlnx-zynqmp.h>
  18
  19 #include <linux/pinctrl/pinmux.h>
  20 #include <linux/pinctrl/pinconf-generic.h>
  21
  22 #include "core.h"
  23 #include "pinctrl-utils.h"
  24
  25 #define ZYNQMP_PIN_PREFIX                       "MIO"
  26 #define PINCTRL_GET_FUNC_NAME_RESP_LEN          16
  27 #define MAX_FUNC_NAME_LEN                       16
  28 #define MAX_GROUP_PIN                           50
  29 #define MAX_PIN_GROUPS                          50
  30 #define END_OF_FUNCTIONS                        "END_OF_FUNCTIONS"
  31 #define NUM_GROUPS_PER_RESP                     6
  32
  33 #define PINCTRL_GET_FUNC_GROUPS_RESP_LEN        12
  34 #define PINCTRL_GET_PIN_GROUPS_RESP_LEN         12
  35 #define NA_GROUP                                0xFFFF
  36 #define RESERVED_GROUP                          0xFFFE
  37
  38 #define DRIVE_STRENGTH_2MA      2
  39 #define DRIVE_STRENGTH_4MA      4
  40 #define DRIVE_STRENGTH_8MA      8
  41 #define DRIVE_STRENGTH_12MA     12
  42
  43 /**
  44  * struct zynqmp_pmux_function - a pinmux function
  45  * @name:       Name of the pin mux function
  46  * @groups:     List of pin groups for this function
  47  * @ngroups:    Number of entries in @groups
  48  * @node:       Firmware node matching with the function
  49  *
  50  * This structure holds information about pin control function
  51  * and function group names supporting that function.
  52  */
  53 struct zynqmp_pmux_function {
  54         char name[MAX_FUNC_NAME_LEN];
  55         const char * const *groups;
  56         unsigned int ngroups;
  57 };
  58
  59 /**
  60  * struct zynqmp_pinctrl - driver data
  61  * @pctrl:      Pin control device
  62  * @groups:     Pin groups
  63  * @ngroups:    Number of @groups
  64  * @funcs:      Pin mux functions
  65  * @nfuncs:     Number of @funcs
  66  *
  67  * This struct is stored as driver data and used to retrieve
  68  * information regarding pin control functions, groups and
  69  * group pins.
  70  */
  71 struct zynqmp_pinctrl {
  72         struct pinctrl_dev *pctrl;
  73         const struct zynqmp_pctrl_group *groups;
  74         unsigned int ngroups;
  75         const struct zynqmp_pmux_function *funcs;
  76         unsigned int nfuncs;
  77 };
  78
  79 /**
  80  * struct zynqmp_pctrl_group - Pin control group info
  81  * @name:       Group name
  82  * @pins:       Group pin numbers
  83  * @npins:      Number of pins in the group
  84  */
  85 struct zynqmp_pctrl_group {
  86         const char *name;
  87         unsigned int pins[MAX_GROUP_PIN];
  88         unsigned int npins;
  89 };
  90
  91 static struct pinctrl_desc zynqmp_desc;
  92
  93 static int zynqmp_pctrl_get_groups_count(struct pinctrl_dev *pctldev)
  94 {
  95         struct zynqmp_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
  96
  97         return pctrl->ngroups;
  98 }
  99
 100 static const char *zynqmp_pctrl_get_group_name(struct pinctrl_dev *pctldev,
 101                                                unsigned int selector)
 102 {
 103         struct zynqmp_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 104
 105         return pctrl->groups[selector].name;
 106 }
 107
 108 static int zynqmp_pctrl_get_group_pins(struct pinctrl_dev *pctldev,
 109                                        unsigned int selector,
 110                                        const unsigned int **pins,
 111                                        unsigned int *npins)
 112 {
 113         struct zynqmp_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 114
 115         *pins = pctrl->groups[selector].pins;
 116         *npins = pctrl->groups[selector].npins;
 117
 118         return 0;
 119 }
 120
 121 static const struct pinctrl_ops zynqmp_pctrl_ops = {
 122         .get_groups_count = zynqmp_pctrl_get_groups_count,
 123         .get_group_name = zynqmp_pctrl_get_group_name,
 124         .get_group_pins = zynqmp_pctrl_get_group_pins,
 125         .dt_node_to_map = pinconf_generic_dt_node_to_map_all,
 126         .dt_free_map = pinctrl_utils_free_map,
 127 };
 128
 129 static int zynqmp_pinmux_request_pin(struct pinctrl_dev *pctldev,
 130                                      unsigned int pin)
 131 {
 132         int ret;
 133
 134         ret = zynqmp_pm_pinctrl_request(pin);
 135         if (ret) {
 136                 dev_err(pctldev->dev, "request failed for pin %u\n", pin);
 137                 return ret;
 138         }
 139
 140         return 0;
 141 }
 142
 143 static int zynqmp_pmux_get_functions_count(struct pinctrl_dev *pctldev)
 144 {
 145         struct zynqmp_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 146
 147         return pctrl->nfuncs;
 148 }
 149
 150 static const char *zynqmp_pmux_get_function_name(struct pinctrl_dev *pctldev,
 151                                                  unsigned int selector)
 152 {
 153         struct zynqmp_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 154
 155         return pctrl->funcs[selector].name;
 156 }
 157
 158 /**
 159  * zynqmp_pmux_get_function_groups() - Get groups for the function
 160  * @pctldev:    Pincontrol device pointer.
 161  * @selector:   Function ID
 162  * @groups:     Group names.
 163  * @num_groups: Number of function groups.
 164  *
 165  * Get function's group count and group names.
 166  */
 167 static int zynqmp_pmux_get_function_groups(struct pinctrl_dev *pctldev,
 168                                            unsigned int selector,
 169                                            const char * const **groups,
 170                                            unsigned * const num_groups)
 171 {
 172         struct zynqmp_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 173
 174         *groups = pctrl->funcs[selector].groups;
 175         *num_groups = pctrl->funcs[selector].ngroups;
 176
 177         return 0;
 178 }
 179
 180 /**
 181  * zynqmp_pinmux_set_mux() - Set requested function for the group
 182  * @pctldev:    Pincontrol device pointer.
 183  * @function:   Function ID.
 184  * @group:      Group ID.
 185  *
 186  * Loop through all pins of the group and call firmware API
 187  * to set requested function for all pins in the group.
 188  *
 189  * Return: 0 on success else error code.
 190  */
 191 static int zynqmp_pinmux_set_mux(struct pinctrl_dev *pctldev,
 192                                  unsigned int function,
 193                                  unsigned int group)
 194 {
 195         struct zynqmp_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 196         const struct zynqmp_pctrl_group *pgrp = &pctrl->groups[group];
 197         int ret, i;
 198
 199         for (i = 0; i < pgrp->npins; i++) {
 200                 unsigned int pin = pgrp->pins[i];
 201
 202                 ret = zynqmp_pm_pinctrl_set_function(pin, function);
 203                 if (ret) {
 204                         dev_err(pctldev->dev, "set mux failed for pin %u\n",
 205                                 pin);
 206                         return ret;
 207                 }
 208         }
 209
 210         return 0;
 211 }
 212
 213 static int zynqmp_pinmux_release_pin(struct pinctrl_dev *pctldev,
 214                                      unsigned int pin)
 215 {
 216         int ret;
 217
 218         ret = zynqmp_pm_pinctrl_release(pin);
 219         if (ret) {
 220                 dev_err(pctldev->dev, "free pin failed for pin %u\n",
 221                         pin);
 222                 return ret;
 223         }
 224
 225         return 0;
 226 }
 227
 228 static const struct pinmux_ops zynqmp_pinmux_ops = {
 229         .request = zynqmp_pinmux_request_pin,
 230         .get_functions_count = zynqmp_pmux_get_functions_count,
 231         .get_function_name = zynqmp_pmux_get_function_name,
 232         .get_function_groups = zynqmp_pmux_get_function_groups,
 233         .set_mux = zynqmp_pinmux_set_mux,
 234         .free = zynqmp_pinmux_release_pin,
 235 };
 236
 237 /**
 238  * zynqmp_pinconf_cfg_get() - get config value for the pin
 239  * @pctldev:    Pin control device pointer.
 240  * @pin:        Pin number.
 241  * @config:     Value of config param.
 242  *
 243  * Get value of the requested configuration parameter for the
 244  * given pin.
 245  *
 246  * Return: 0 on success else error code.
 247  */
 248 static int zynqmp_pinconf_cfg_get(struct pinctrl_dev *pctldev,
 249                                   unsigned int pin,
 250                                   unsigned long *config)
 251 {
 252         unsigned int arg, param = pinconf_to_config_param(*config);
 253         int ret;
 254
 255         switch (param) {
 256         case PIN_CONFIG_SLEW_RATE:
 257                 param = PM_PINCTRL_CONFIG_SLEW_RATE;
 258                 ret = zynqmp_pm_pinctrl_get_config(pin, param, &arg);
 259                 break;
 260         case PIN_CONFIG_BIAS_PULL_UP:
 261                 param = PM_PINCTRL_CONFIG_PULL_CTRL;
 262                 ret = zynqmp_pm_pinctrl_get_config(pin, param, &arg);
 263                 if (arg != PM_PINCTRL_BIAS_PULL_UP)
 264                         return -EINVAL;
 265
 266                 arg = 1;
 267                 break;
 268         case PIN_CONFIG_BIAS_PULL_DOWN:
 269                 param = PM_PINCTRL_CONFIG_PULL_CTRL;
 270                 ret = zynqmp_pm_pinctrl_get_config(pin, param, &arg);
 271                 if (arg != PM_PINCTRL_BIAS_PULL_DOWN)
 272                         return -EINVAL;
 273
 274                 arg = 1;
 275                 break;
 276         case PIN_CONFIG_BIAS_DISABLE:
 277                 param = PM_PINCTRL_CONFIG_BIAS_STATUS;
 278                 ret = zynqmp_pm_pinctrl_get_config(pin, param, &arg);
 279                 if (arg != PM_PINCTRL_BIAS_DISABLE)
 280                         return -EINVAL;
 281
 282                 arg = 1;
 283                 break;
 284         case PIN_CONFIG_POWER_SOURCE:
 285                 param = PM_PINCTRL_CONFIG_VOLTAGE_STATUS;
 286                 ret = zynqmp_pm_pinctrl_get_config(pin, param, &arg);
 287                 break;
 288         case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
 289                 param = PM_PINCTRL_CONFIG_SCHMITT_CMOS;
 290                 ret = zynqmp_pm_pinctrl_get_config(pin, param, &arg);
 291                 break;
 292         case PIN_CONFIG_DRIVE_STRENGTH:
 293                 param = PM_PINCTRL_CONFIG_DRIVE_STRENGTH;
 294                 ret = zynqmp_pm_pinctrl_get_config(pin, param, &arg);
 295                 switch (arg) {
 296                 case PM_PINCTRL_DRIVE_STRENGTH_2MA:
 297                         arg = DRIVE_STRENGTH_2MA;
 298                         break;
 299                 case PM_PINCTRL_DRIVE_STRENGTH_4MA:
 300                         arg = DRIVE_STRENGTH_4MA;
 301                         break;
 302                 case PM_PINCTRL_DRIVE_STRENGTH_8MA:
 303                         arg = DRIVE_STRENGTH_8MA;
 304                         break;
 305                 case PM_PINCTRL_DRIVE_STRENGTH_12MA:
 306                         arg = DRIVE_STRENGTH_12MA;
 307                         break;
 308                 default:
 309                         /* Invalid drive strength */
 310                         dev_warn(pctldev->dev,
 311                                  "Invalid drive strength for pin %d\n",
 312                                  pin);
 313                         return -EINVAL;
 314                 }
 315                 break;
 316         default:
 317                 ret = -ENOTSUPP;
 318                 break;
 319         }
 320
 321         if (ret)
 322                 return ret;
 323
 324         param = pinconf_to_config_param(*config);
 325         *config = pinconf_to_config_packed(param, arg);
 326
 327         return 0;
 328 }
 329
 330 /**
 331  * zynqmp_pinconf_cfg_set() - Set requested config for the pin
 332  * @pctldev:            Pincontrol device pointer.
 333  * @pin:                Pin number.
 334  * @configs:            Configuration to set.
 335  * @num_configs:        Number of configurations.
 336  *
 337  * Loop through all configurations and call firmware API
 338  * to set requested configurations for the pin.
 339  *
 340  * Return: 0 on success else error code.
 341  */
 342 static int zynqmp_pinconf_cfg_set(struct pinctrl_dev *pctldev,
 343                                   unsigned int pin, unsigned long *configs,
 344                                   unsigned int num_configs)
 345 {
 346         int i, ret;
 347
 348         for (i = 0; i < num_configs; i++) {
 349                 unsigned int param = pinconf_to_config_param(configs[i]);
 350                 unsigned int arg = pinconf_to_config_argument(configs[i]);
 351                 unsigned int value;
 352
 353                 switch (param) {
 354                 case PIN_CONFIG_SLEW_RATE:
 355                         param = PM_PINCTRL_CONFIG_SLEW_RATE;
 356                         ret = zynqmp_pm_pinctrl_set_config(pin, param, arg);
 357                         break;
 358                 case PIN_CONFIG_BIAS_PULL_UP:
 359                         param = PM_PINCTRL_CONFIG_PULL_CTRL;
 360                         arg = PM_PINCTRL_BIAS_PULL_UP;
 361                         ret = zynqmp_pm_pinctrl_set_config(pin, param, arg);
 362                         break;
 363                 case PIN_CONFIG_BIAS_PULL_DOWN:
 364                         param = PM_PINCTRL_CONFIG_PULL_CTRL;
 365                         arg = PM_PINCTRL_BIAS_PULL_DOWN;
 366                         ret = zynqmp_pm_pinctrl_set_config(pin, param, arg);
 367                         break;
 368                 case PIN_CONFIG_BIAS_DISABLE:
 369                         param = PM_PINCTRL_CONFIG_BIAS_STATUS;
 370                         arg = PM_PINCTRL_BIAS_DISABLE;
 371                         ret = zynqmp_pm_pinctrl_set_config(pin, param, arg);
 372                         break;
 373                 case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
 374                         param = PM_PINCTRL_CONFIG_SCHMITT_CMOS;
 375                         ret = zynqmp_pm_pinctrl_set_config(pin, param, arg);
 376                         break;
 377                 case PIN_CONFIG_DRIVE_STRENGTH:
 378                         switch (arg) {
 379                         case DRIVE_STRENGTH_2MA:
 380                                 value = PM_PINCTRL_DRIVE_STRENGTH_2MA;
 381                                 break;
 382                         case DRIVE_STRENGTH_4MA:
 383                                 value = PM_PINCTRL_DRIVE_STRENGTH_4MA;
 384                                 break;
 385                         case DRIVE_STRENGTH_8MA:
 386                                 value = PM_PINCTRL_DRIVE_STRENGTH_8MA;
 387                                 break;
 388                         case DRIVE_STRENGTH_12MA:
 389                                 value = PM_PINCTRL_DRIVE_STRENGTH_12MA;
 390                                 break;
 391                         default:
 392                                 /* Invalid drive strength */
 393                                 dev_warn(pctldev->dev,
 394                                          "Invalid drive strength for pin %d\n",
 395                                          pin);
 396                                 return -EINVAL;
 397                         }
 398
 399                         param = PM_PINCTRL_CONFIG_DRIVE_STRENGTH;
 400                         ret = zynqmp_pm_pinctrl_set_config(pin, param, value);
 401                         break;
 402                 case PIN_CONFIG_POWER_SOURCE:
 403                         param = PM_PINCTRL_CONFIG_VOLTAGE_STATUS;
 404                         ret = zynqmp_pm_pinctrl_get_config(pin, param, &value);
 405
 406                         if (arg != value)
 407                                 dev_warn(pctldev->dev,
 408                                          "Invalid IO Standard requested for pin %d\n",
 409                                          pin);
 410
 411                         break;
 412                 case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
 413                 case PIN_CONFIG_MODE_LOW_POWER:
 414                         /*
 415                          * These cases are mentioned in dts but configurable
 416                          * registers are unknown. So falling through to ignore
 417                          * boot time warnings as of now.
 418                          */
 419                         ret = 0;
 420                         break;
 421                 default:
 422                         dev_warn(pctldev->dev,
 423                                  "unsupported configuration parameter '%u'\n",
 424                                  param);
 425                         ret = -ENOTSUPP;
 426                         break;
 427                 }
 428
 429                 param = pinconf_to_config_param(configs[i]);
 430                 arg = pinconf_to_config_argument(configs[i]);
 431                 if (ret)
 432                         dev_warn(pctldev->dev,
 433                                  "failed to set: pin %u param %u value %u\n",
 434                                  pin, param, arg);
 435         }
 436
 437         return 0;
 438 }
 439
 440 /**
 441  * zynqmp_pinconf_group_set() - Set requested config for the group
 442  * @pctldev:            Pincontrol device pointer.
 443  * @selector:           Group ID.
 444  * @configs:            Configuration to set.
 445  * @num_configs:        Number of configurations.
 446  *
 447  * Call function to set configs for each pin in the group.
 448  *
 449  * Return: 0 on success else error code.
 450  */
 451 static int zynqmp_pinconf_group_set(struct pinctrl_dev *pctldev,
 452                                     unsigned int selector,
 453                                     unsigned long *configs,
 454                                     unsigned int num_configs)
 455 {
 456         int i, ret;
 457         struct zynqmp_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 458         const struct zynqmp_pctrl_group *pgrp = &pctrl->groups[selector];
 459
 460         for (i = 0; i < pgrp->npins; i++) {
 461                 ret = zynqmp_pinconf_cfg_set(pctldev, pgrp->pins[i], configs,
 462                                              num_configs);
 463                 if (ret)
 464                         return ret;
 465         }
 466
 467         return 0;
 468 }
 469
 470 static const struct pinconf_ops zynqmp_pinconf_ops = {
 471         .is_generic = true,
 472         .pin_config_get = zynqmp_pinconf_cfg_get,
 473         .pin_config_set = zynqmp_pinconf_cfg_set,
 474         .pin_config_group_set = zynqmp_pinconf_group_set,
 475 };
 476
 477 static struct pinctrl_desc zynqmp_desc = {
 478         .name = "zynqmp_pinctrl",
 479         .owner = THIS_MODULE,
 480         .pctlops = &zynqmp_pctrl_ops,
 481         .pmxops = &zynqmp_pinmux_ops,
 482         .confops = &zynqmp_pinconf_ops,
 483 };
 484
 485 static int zynqmp_pinctrl_get_function_groups(u32 fid, u32 index, u16 *groups)
 486 {
 487         struct zynqmp_pm_query_data qdata = {0};
 488         u32 payload[PAYLOAD_ARG_CNT];
 489         int ret;
 490
 491         qdata.qid = PM_QID_PINCTRL_GET_FUNCTION_GROUPS;
 492         qdata.arg1 = fid;
 493         qdata.arg2 = index;
 494
 495         ret = zynqmp_pm_query_data(qdata, payload);
 496         if (ret)
 497                 return ret;
 498
 499         memcpy(groups, &payload[1], PINCTRL_GET_FUNC_GROUPS_RESP_LEN);
 500
 501         return 0;
 502 }
 503
 504 static int zynqmp_pinctrl_get_func_num_groups(u32 fid, unsigned int *ngroups)
 505 {
 506         struct zynqmp_pm_query_data qdata = {0};
 507         u32 payload[PAYLOAD_ARG_CNT];
 508         int ret;
 509
 510         qdata.qid = PM_QID_PINCTRL_GET_NUM_FUNCTION_GROUPS;
 511         qdata.arg1 = fid;
 512
 513         ret = zynqmp_pm_query_data(qdata, payload);
 514         if (ret)
 515                 return ret;
 516
 517         *ngroups = payload[1];
 518
 519         return 0;
 520 }
 521
 522 /**
 523  * zynqmp_pinctrl_prepare_func_groups() - prepare function and groups data
 524  * @dev:        Device pointer.
 525  * @fid:        Function ID.
 526  * @func:       Function data.
 527  * @groups:     Groups data.
 528  *
 529  * Query firmware to get group IDs for each function. Firmware returns
 530  * group IDs. Based on the group index for the function, group names in
 531  * the function are stored. For example, the first group in "eth0" function
 532  * is named as "eth0_0" and the second group as "eth0_1" and so on.
 533  *
 534  * Based on the group ID received from the firmware, function stores name of
 535  * the group for that group ID. For example, if "eth0" first group ID
 536  * is x, groups[x] name will be stored as "eth0_0".
 537  *
 538  * Once done for each function, each function would have its group names
 539  * and each group would also have their names.
 540  *
 541  * Return: 0 on success else error code.
 542  */
 543 static int zynqmp_pinctrl_prepare_func_groups(struct device *dev, u32 fid,
 544                                               struct zynqmp_pmux_function *func,
 545                                               struct zynqmp_pctrl_group *groups)
 546 {
 547         u16 resp[NUM_GROUPS_PER_RESP] = {0};
 548         const char **fgroups;
 549         int ret, index, i;
 550
 551         fgroups = devm_kzalloc(dev, sizeof(*fgroups) * func->ngroups, GFP_KERNEL);
 552         if (!fgroups)
 553                 return -ENOMEM;
 554
 555         for (index = 0; index < func->ngroups; index += NUM_GROUPS_PER_RESP) {
 556                 ret = zynqmp_pinctrl_get_function_groups(fid, index, resp);
 557                 if (ret)
 558                         return ret;
 559
 560                 for (i = 0; i < NUM_GROUPS_PER_RESP; i++) {
 561                         if (resp[i] == NA_GROUP)
 562                                 goto done;
 563
 564                         if (resp[i] == RESERVED_GROUP)
 565                                 continue;
 566
 567                         fgroups[index + i] = devm_kasprintf(dev, GFP_KERNEL,
 568                                                             "%s_%d_grp",
 569                                                             func->name,
 570                                                             index + i);
 571                         if (!fgroups[index + i])
 572                                 return -ENOMEM;
 573
 574                         groups[resp[i]].name = devm_kasprintf(dev, GFP_KERNEL,
 575                                                               "%s_%d_grp",
 576                                                               func->name,
 577                                                               index + i);
 578                         if (!groups[resp[i]].name)
 579                                 return -ENOMEM;
 580                 }
 581         }
 582 done:
 583         func->groups = fgroups;
 584
 585         return 0;
 586 }
 587
 588 static void zynqmp_pinctrl_get_function_name(u32 fid, char *name)
 589 {
 590         struct zynqmp_pm_query_data qdata = {0};
 591         u32 payload[PAYLOAD_ARG_CNT];
 592
 593         qdata.qid = PM_QID_PINCTRL_GET_FUNCTION_NAME;
 594         qdata.arg1 = fid;
 595
 596         /*
 597          * Name of the function is maximum 16 bytes and cannot
 598          * accommodate the return value in SMC buffers, hence ignoring
 599          * the return value for this specific qid.
 600          */
 601         zynqmp_pm_query_data(qdata, payload);
 602         memcpy(name, payload, PINCTRL_GET_FUNC_NAME_RESP_LEN);
 603 }
 604
 605 static int zynqmp_pinctrl_get_num_functions(unsigned int *nfuncs)
 606 {
 607         struct zynqmp_pm_query_data qdata = {0};
 608         u32 payload[PAYLOAD_ARG_CNT];
 609         int ret;
 610
 611         qdata.qid = PM_QID_PINCTRL_GET_NUM_FUNCTIONS;
 612
 613         ret = zynqmp_pm_query_data(qdata, payload);
 614         if (ret)
 615                 return ret;
 616
 617         *nfuncs = payload[1];
 618
 619         return 0;
 620 }
 621
 622 static int zynqmp_pinctrl_get_pin_groups(u32 pin, u32 index, u16 *groups)
 623 {
 624         struct zynqmp_pm_query_data qdata = {0};
 625         u32 payload[PAYLOAD_ARG_CNT];
 626         int ret;
 627
 628         qdata.qid = PM_QID_PINCTRL_GET_PIN_GROUPS;
 629         qdata.arg1 = pin;
 630         qdata.arg2 = index;
 631
 632         ret = zynqmp_pm_query_data(qdata, payload);
 633         if (ret)
 634                 return ret;
 635
 636         memcpy(groups, &payload[1], PINCTRL_GET_PIN_GROUPS_RESP_LEN);
 637
 638         return 0;
 639 }
 640
 641 static void zynqmp_pinctrl_group_add_pin(struct zynqmp_pctrl_group *group,
 642                                          unsigned int pin)
 643 {
 644         group->pins[group->npins++] = pin;
 645 }
 646
 647 /**
 648  * zynqmp_pinctrl_create_pin_groups() - assign pins to respective groups
 649  * @dev:        Device pointer.
 650  * @groups:     Groups data.
 651  * @pin:        Pin number.
 652  *
 653  * Query firmware to get groups available for the given pin.
 654  * Based on the firmware response(group IDs for the pin), add
 655  * pin number to the respective group's pin array.
 656  *
 657  * Once all pins are queries, each group would have its number
 658  * of pins and pin numbers data.
 659  *
 660  * Return: 0 on success else error code.
 661  */
 662 static int zynqmp_pinctrl_create_pin_groups(struct device *dev,
 663                                             struct zynqmp_pctrl_group *groups,
 664                                             unsigned int pin)
 665 {
 666         u16 resp[NUM_GROUPS_PER_RESP] = {0};
 667         int ret, i, index = 0;
 668
 669         do {
 670                 ret = zynqmp_pinctrl_get_pin_groups(pin, index, resp);
 671                 if (ret)
 672                         return ret;
 673
 674                 for (i = 0; i < NUM_GROUPS_PER_RESP; i++) {
 675                         if (resp[i] == NA_GROUP)
 676                                 return ret;
 677
 678                         if (resp[i] == RESERVED_GROUP)
 679                                 continue;
 680
 681                         zynqmp_pinctrl_group_add_pin(&groups[resp[i]], pin);
 682                 }
 683                 index += NUM_GROUPS_PER_RESP;
 684         } while (index <= MAX_PIN_GROUPS);
 685
 686         return 0;
 687 }
 688
 689 /**
 690  * zynqmp_pinctrl_prepare_group_pins() - prepare each group's pin data
 691  * @dev:        Device pointer.
 692  * @groups:     Groups data.
 693  * @ngroups:    Number of groups.
 694  *
 695  * Prepare pin number and number of pins data for each pins.
 696  *
 697  * Return: 0 on success else error code.
 698  */
 699 static int zynqmp_pinctrl_prepare_group_pins(struct device *dev,
 700                                              struct zynqmp_pctrl_group *groups,
 701                                              unsigned int ngroups)
 702 {
 703         unsigned int pin;
 704         int ret;
 705
 706         for (pin = 0; pin < zynqmp_desc.npins; pin++) {
 707                 ret = zynqmp_pinctrl_create_pin_groups(dev, groups, pin);
 708                 if (ret)
 709                         return ret;
 710         }
 711
 712         return 0;
 713 }
 714
 715 /**
 716  * zynqmp_pinctrl_prepare_function_info() - prepare function info
 717  * @dev:        Device pointer.
 718  * @pctrl:      Pin control driver data.
 719  *
 720  * Query firmware for functions, groups and pin information and
 721  * prepare pin control driver data.
 722  *
 723  * Query number of functions and number of function groups (number
 724  * of groups in the given function) to allocate required memory buffers
 725  * for functions and groups. Once buffers are allocated to store
 726  * functions and groups data, query and store required information
 727  * (number of groups and group names for each function, number of
 728  * pins and pin numbers for each group).
 729  *
 730  * Return: 0 on success else error code.
 731  */
 732 static int zynqmp_pinctrl_prepare_function_info(struct device *dev,
 733                                                 struct zynqmp_pinctrl *pctrl)
 734 {
 735         struct zynqmp_pmux_function *funcs;
 736         struct zynqmp_pctrl_group *groups;
 737         int ret, i;
 738
 739         ret = zynqmp_pinctrl_get_num_functions(&pctrl->nfuncs);
 740         if (ret)
 741                 return ret;
 742
 743         funcs = devm_kzalloc(dev, sizeof(*funcs) * pctrl->nfuncs, GFP_KERNEL);
 744         if (!funcs)
 745                 return -ENOMEM;
 746
 747         for (i = 0; i < pctrl->nfuncs; i++) {
 748                 zynqmp_pinctrl_get_function_name(i, funcs[i].name);
 749
 750                 ret = zynqmp_pinctrl_get_func_num_groups(i, &funcs[i].ngroups);
 751                 if (ret)
 752                         return ret;
 753
 754                 pctrl->ngroups += funcs[i].ngroups;
 755         }
 756
 757         groups = devm_kzalloc(dev, sizeof(*groups) * pctrl->ngroups, GFP_KERNEL);
 758         if (!groups)
 759                 return -ENOMEM;
 760
 761         for (i = 0; i < pctrl->nfuncs; i++) {
 762                 ret = zynqmp_pinctrl_prepare_func_groups(dev, i, &funcs[i],
 763                                                          groups);
 764                 if (ret)
 765                         return ret;
 766         }
 767
 768         ret = zynqmp_pinctrl_prepare_group_pins(dev, groups, pctrl->ngroups);
 769         if (ret)
 770                 return ret;
 771
 772         pctrl->funcs = funcs;
 773         pctrl->groups = groups;
 774
 775         return 0;
 776 }
 777
 778 static int zynqmp_pinctrl_get_num_pins(unsigned int *npins)
 779 {
 780         struct zynqmp_pm_query_data qdata = {0};
 781         u32 payload[PAYLOAD_ARG_CNT];
 782         int ret;
 783
 784         qdata.qid = PM_QID_PINCTRL_GET_NUM_PINS;
 785
 786         ret = zynqmp_pm_query_data(qdata, payload);
 787         if (ret)
 788                 return ret;
 789
 790         *npins = payload[1];
 791
 792         return 0;
 793 }
 794
 795 /**
 796  * zynqmp_pinctrl_prepare_pin_desc() - prepare pin description info
 797  * @dev:                Device pointer.
 798  * @zynqmp_pins:        Pin information.
 799  * @npins:              Number of pins.
 800  *
 801  * Query number of pins information from firmware and prepare pin
 802  * description containing pin number and pin name.
 803  *
 804  * Return: 0 on success else error code.
 805  */
 806 static int zynqmp_pinctrl_prepare_pin_desc(struct device *dev,
 807                                            const struct pinctrl_pin_desc
 808                                            **zynqmp_pins,
 809                                            unsigned int *npins)
 810 {
 811         struct pinctrl_pin_desc *pins, *pin;
 812         int ret;
 813         int i;
 814
 815         ret = zynqmp_pinctrl_get_num_pins(npins);
 816         if (ret)
 817                 return ret;
 818
 819         pins = devm_kzalloc(dev, sizeof(*pins) * *npins, GFP_KERNEL);
 820         if (!pins)
 821                 return -ENOMEM;
 822
 823         for (i = 0; i < *npins; i++) {
 824                 pin = &pins[i];
 825                 pin->number = i;
 826                 pin->name = devm_kasprintf(dev, GFP_KERNEL, "%s%d",
 827                                            ZYNQMP_PIN_PREFIX, i);
 828                 if (!pin->name)
 829                         return -ENOMEM;
 830         }
 831
 832         *zynqmp_pins = pins;
 833
 834         return 0;
 835 }
 836
 837 static int zynqmp_pinctrl_probe(struct platform_device *pdev)
 838 {
 839         struct zynqmp_pinctrl *pctrl;
 840         int ret;
 841
 842         pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL);
 843         if (!pctrl)
 844                 return -ENOMEM;
 845
 846         ret = zynqmp_pinctrl_prepare_pin_desc(&pdev->dev,
 847                                               &zynqmp_desc.pins,
 848                                               &zynqmp_desc.npins);
 849         if (ret) {
 850                 dev_err(&pdev->dev, "pin desc prepare fail with %d\n", ret);
 851                 return ret;
 852         }
 853
 854         ret = zynqmp_pinctrl_prepare_function_info(&pdev->dev, pctrl);
 855         if (ret) {
 856                 dev_err(&pdev->dev, "function info prepare fail with %d\n", ret);
 857                 return ret;
 858         }
 859
 860         pctrl->pctrl = devm_pinctrl_register(&pdev->dev, &zynqmp_desc, pctrl);
 861         if (IS_ERR(pctrl->pctrl))
 862                 return PTR_ERR(pctrl->pctrl);
 863
 864         platform_set_drvdata(pdev, pctrl);
 865
 866         return ret;
 867 }
 868
 869 static const struct of_device_id zynqmp_pinctrl_of_match[] = {
 870         { .compatible = "xlnx,zynqmp-pinctrl" },
 871         { }
 872 };
 873 MODULE_DEVICE_TABLE(of, zynqmp_pinctrl_of_match);
 874
 875 static struct platform_driver zynqmp_pinctrl_driver = {
 876         .driver = {
 877                 .name = "zynqmp-pinctrl",
 878                 .of_match_table = zynqmp_pinctrl_of_match,
 879         },
 880         .probe = zynqmp_pinctrl_probe,
 881 };
 882 module_platform_driver(zynqmp_pinctrl_driver);
 883
 884 MODULE_AUTHOR("Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@xilinx.com>");
 885 MODULE_DESCRIPTION("ZynqMP Pin Controller Driver");
 886 MODULE_LICENSE("GPL v2");