drivers/pinctrl/pinctrl-rk805.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Pinctrl driver for Rockchip RK805 PMIC
   4  *
   5  * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
   6  *
   7  * Author: Joseph Chen <chenjh@rock-chips.com>
   8  *
   9  * Based on the pinctrl-as3722 driver
  10  */
  11
  12 #include <linux/gpio/driver.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/mfd/rk808.h>
  16 #include <linux/of.h>
  17 #include <linux/of_device.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/pinctrl/consumer.h>
  20 #include <linux/pinctrl/machine.h>
  21 #include <linux/pinctrl/pinctrl.h>
  22 #include <linux/pinctrl/pinconf-generic.h>
  23 #include <linux/pinctrl/pinconf.h>
  24 #include <linux/pinctrl/pinmux.h>
  25 #include <linux/pm.h>
  26 #include <linux/slab.h>
  27
  28 #include "core.h"
  29 #include "pinconf.h"
  30 #include "pinctrl-utils.h"
  31
  32 struct rk805_pin_function {
  33         const char *name;
  34         const char *const *groups;
  35         unsigned int ngroups;
  36         int mux_option;
  37 };
  38
  39 struct rk805_pin_group {
  40         const char *name;
  41         const unsigned int pins[1];
  42         unsigned int npins;
  43 };
  44
  45 /*
  46  * @reg: gpio setting register;
  47  * @fun_mask: functions select mask value, when set is gpio;
  48  * @dir_mask: input or output mask value, when set is output, otherwise input;
  49  * @val_mask: gpio set value, when set is level high, otherwise low;
  50  *
  51  * Different PMIC has different pin features, belowing 3 mask members are not
  52  * all necessary for every PMIC. For example, RK805 has 2 pins that can be used
  53  * as output only GPIOs, so func_mask and dir_mask are not needed. RK816 has 1
  54  * pin that can be used as TS/GPIO, so fun_mask, dir_mask and val_mask are all
  55  * necessary.
  56  */
  57 struct rk805_pin_config {
  58         u8 reg;
  59         u8 fun_msk;
  60         u8 dir_msk;
  61         u8 val_msk;
  62 };
  63
  64 struct rk805_pctrl_info {
  65         struct rk808 *rk808;
  66         struct device *dev;
  67         struct pinctrl_dev *pctl;
  68         struct gpio_chip gpio_chip;
  69         struct pinctrl_desc pinctrl_desc;
  70         const struct rk805_pin_function *functions;
  71         unsigned int num_functions;
  72         const struct rk805_pin_group *groups;
  73         int num_pin_groups;
  74         const struct pinctrl_pin_desc *pins;
  75         unsigned int num_pins;
  76         struct rk805_pin_config *pin_cfg;
  77 };
  78
  79 enum rk805_pinmux_option {
  80         RK805_PINMUX_GPIO,
  81 };
  82
  83 enum {
  84         RK805_GPIO0,
  85         RK805_GPIO1,
  86 };
  87
  88 static const char *const rk805_gpio_groups[] = {
  89         "gpio0",
  90         "gpio1",
  91 };
  92
  93 /* RK805: 2 output only GPIOs */
  94 static const struct pinctrl_pin_desc rk805_pins_desc[] = {
  95         PINCTRL_PIN(RK805_GPIO0, "gpio0"),
  96         PINCTRL_PIN(RK805_GPIO1, "gpio1"),
  97 };
  98
  99 static const struct rk805_pin_function rk805_pin_functions[] = {
 100         {
 101                 .name = "gpio",
 102                 .groups = rk805_gpio_groups,
 103                 .ngroups = ARRAY_SIZE(rk805_gpio_groups),
 104                 .mux_option = RK805_PINMUX_GPIO,
 105         },
 106 };
 107
 108 static const struct rk805_pin_group rk805_pin_groups[] = {
 109         {
 110                 .name = "gpio0",
 111                 .pins = { RK805_GPIO0 },
 112                 .npins = 1,
 113         },
 114         {
 115                 .name = "gpio1",
 116                 .pins = { RK805_GPIO1 },
 117                 .npins = 1,
 118         },
 119 };
 120
 121 #define RK805_GPIO0_VAL_MSK     BIT(0)
 122 #define RK805_GPIO1_VAL_MSK     BIT(1)
 123
 124 static struct rk805_pin_config rk805_gpio_cfgs[] = {
 125         {
 126                 .reg = RK805_OUT_REG,
 127                 .val_msk = RK805_GPIO0_VAL_MSK,
 128         },
 129         {
 130                 .reg = RK805_OUT_REG,
 131                 .val_msk = RK805_GPIO1_VAL_MSK,
 132         },
 133 };
 134
 135 /* generic gpio chip */
 136 static int rk805_gpio_get(struct gpio_chip *chip, unsigned int offset)
 137 {
 138         struct rk805_pctrl_info *pci = gpiochip_get_data(chip);
 139         int ret, val;
 140
 141         ret = regmap_read(pci->rk808->regmap, pci->pin_cfg[offset].reg, &val);
 142         if (ret) {
 143                 dev_err(pci->dev, "get gpio%d value failed\n", offset);
 144                 return ret;
 145         }
 146
 147         return !!(val & pci->pin_cfg[offset].val_msk);
 148 }
 149
 150 static void rk805_gpio_set(struct gpio_chip *chip,
 151                            unsigned int offset,
 152                            int value)
 153 {
 154         struct rk805_pctrl_info *pci = gpiochip_get_data(chip);
 155         int ret;
 156
 157         ret = regmap_update_bits(pci->rk808->regmap,
 158                                  pci->pin_cfg[offset].reg,
 159                                  pci->pin_cfg[offset].val_msk,
 160                                  value ? pci->pin_cfg[offset].val_msk : 0);
 161         if (ret)
 162                 dev_err(pci->dev, "set gpio%d value %d failed\n",
 163                         offset, value);
 164 }
 165
 166 static int rk805_gpio_direction_input(struct gpio_chip *chip,
 167                                       unsigned int offset)
 168 {
 169         return pinctrl_gpio_direction_input(chip->base + offset);
 170 }
 171
 172 static int rk805_gpio_direction_output(struct gpio_chip *chip,
 173                                        unsigned int offset, int value)
 174 {
 175         rk805_gpio_set(chip, offset, value);
 176         return pinctrl_gpio_direction_output(chip->base + offset);
 177 }
 178
 179 static int rk805_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
 180 {
 181         struct rk805_pctrl_info *pci = gpiochip_get_data(chip);
 182         unsigned int val;
 183         int ret;
 184
 185         /* default output*/
 186         if (!pci->pin_cfg[offset].dir_msk)
 187                 return 0;
 188
 189         ret = regmap_read(pci->rk808->regmap,
 190                           pci->pin_cfg[offset].reg,
 191                           &val);
 192         if (ret) {
 193                 dev_err(pci->dev, "get gpio%d direction failed\n", offset);
 194                 return ret;
 195         }
 196
 197         return !(val & pci->pin_cfg[offset].dir_msk);
 198 }
 199
 200 static const struct gpio_chip rk805_gpio_chip = {
 201         .label                  = "rk805-gpio",
 202         .request                = gpiochip_generic_request,
 203         .free                   = gpiochip_generic_free,
 204         .get_direction          = rk805_gpio_get_direction,
 205         .get                    = rk805_gpio_get,
 206         .set                    = rk805_gpio_set,
 207         .direction_input        = rk805_gpio_direction_input,
 208         .direction_output       = rk805_gpio_direction_output,
 209         .can_sleep              = true,
 210         .base                   = -1,
 211         .owner                  = THIS_MODULE,
 212 };
 213
 214 /* generic pinctrl */
 215 static int rk805_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
 216 {
 217         struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
 218
 219         return pci->num_pin_groups;
 220 }
 221
 222 static const char *rk805_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
 223                                                 unsigned int group)
 224 {
 225         struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
 226
 227         return pci->groups[group].name;
 228 }
 229
 230 static int rk805_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
 231                                         unsigned int group,
 232                                         const unsigned int **pins,
 233                                         unsigned int *num_pins)
 234 {
 235         struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
 236
 237         *pins = pci->groups[group].pins;
 238         *num_pins = pci->groups[group].npins;
 239
 240         return 0;
 241 }
 242
 243 static const struct pinctrl_ops rk805_pinctrl_ops = {
 244         .get_groups_count = rk805_pinctrl_get_groups_count,
 245         .get_group_name = rk805_pinctrl_get_group_name,
 246         .get_group_pins = rk805_pinctrl_get_group_pins,
 247         .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
 248         .dt_free_map = pinctrl_utils_free_map,
 249 };
 250
 251 static int rk805_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
 252 {
 253         struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
 254
 255         return pci->num_functions;
 256 }
 257
 258 static const char *rk805_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
 259                                                unsigned int function)
 260 {
 261         struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
 262
 263         return pci->functions[function].name;
 264 }
 265
 266 static int rk805_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
 267                                          unsigned int function,
 268                                          const char *const **groups,
 269                                          unsigned int *const num_groups)
 270 {
 271         struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
 272
 273         *groups = pci->functions[function].groups;
 274         *num_groups = pci->functions[function].ngroups;
 275
 276         return 0;
 277 }
 278
 279 static int _rk805_pinctrl_set_mux(struct pinctrl_dev *pctldev,
 280                                   unsigned int offset,
 281                                   int mux)
 282 {
 283         struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
 284         int ret;
 285
 286         if (!pci->pin_cfg[offset].fun_msk)
 287                 return 0;
 288
 289         if (mux == RK805_PINMUX_GPIO) {
 290                 ret = regmap_update_bits(pci->rk808->regmap,
 291                                          pci->pin_cfg[offset].reg,
 292                                          pci->pin_cfg[offset].fun_msk,
 293                                          pci->pin_cfg[offset].fun_msk);
 294                 if (ret) {
 295                         dev_err(pci->dev, "set gpio%d GPIO failed\n", offset);
 296                         return ret;
 297                 }
 298         } else {
 299                 dev_err(pci->dev, "Couldn't find function mux %d\n", mux);
 300                 return -EINVAL;
 301         }
 302
 303         return 0;
 304 }
 305
 306 static int rk805_pinctrl_set_mux(struct pinctrl_dev *pctldev,
 307                                  unsigned int function,
 308                                  unsigned int group)
 309 {
 310         struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
 311         int mux = pci->functions[function].mux_option;
 312         int offset = group;
 313
 314         return _rk805_pinctrl_set_mux(pctldev, offset, mux);
 315 }
 316
 317 static int rk805_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
 318                                         struct pinctrl_gpio_range *range,
 319                                         unsigned int offset, bool input)
 320 {
 321         struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
 322         int ret;
 323
 324         /* switch to gpio function */
 325         ret = _rk805_pinctrl_set_mux(pctldev, offset, RK805_PINMUX_GPIO);
 326         if (ret) {
 327                 dev_err(pci->dev, "set gpio%d mux failed\n", offset);
 328                 return ret;
 329         }
 330
 331         /* set direction */
 332         if (!pci->pin_cfg[offset].dir_msk)
 333                 return 0;
 334
 335         ret = regmap_update_bits(pci->rk808->regmap,
 336                                  pci->pin_cfg[offset].reg,
 337                                  pci->pin_cfg[offset].dir_msk,
 338                                  input ? 0 : pci->pin_cfg[offset].dir_msk);
 339         if (ret) {
 340                 dev_err(pci->dev, "set gpio%d direction failed\n", offset);
 341                 return ret;
 342         }
 343
 344         return ret;
 345 }
 346
 347 static const struct pinmux_ops rk805_pinmux_ops = {
 348         .get_functions_count    = rk805_pinctrl_get_funcs_count,
 349         .get_function_name      = rk805_pinctrl_get_func_name,
 350         .get_function_groups    = rk805_pinctrl_get_func_groups,
 351         .set_mux                = rk805_pinctrl_set_mux,
 352         .gpio_set_direction     = rk805_pmx_gpio_set_direction,
 353 };
 354
 355 static int rk805_pinconf_get(struct pinctrl_dev *pctldev,
 356                              unsigned int pin, unsigned long *config)
 357 {
 358         struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
 359         enum pin_config_param param = pinconf_to_config_param(*config);
 360         u32 arg = 0;
 361
 362         switch (param) {
 363         case PIN_CONFIG_OUTPUT:
 364                 arg = rk805_gpio_get(&pci->gpio_chip, pin);
 365                 break;
 366         default:
 367                 dev_err(pci->dev, "Properties not supported\n");
 368                 return -ENOTSUPP;
 369         }
 370
 371         *config = pinconf_to_config_packed(param, (u16)arg);
 372
 373         return 0;
 374 }
 375
 376 static int rk805_pinconf_set(struct pinctrl_dev *pctldev,
 377                              unsigned int pin, unsigned long *configs,
 378                              unsigned int num_configs)
 379 {
 380         struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev);
 381         enum pin_config_param param;
 382         u32 i, arg = 0;
 383
 384         for (i = 0; i < num_configs; i++) {
 385                 param = pinconf_to_config_param(configs[i]);
 386                 arg = pinconf_to_config_argument(configs[i]);
 387
 388                 switch (param) {
 389                 case PIN_CONFIG_OUTPUT:
 390                         rk805_gpio_set(&pci->gpio_chip, pin, arg);
 391                         rk805_pmx_gpio_set_direction(pctldev, NULL, pin, false);
 392                         break;
 393                 default:
 394                         dev_err(pci->dev, "Properties not supported\n");
 395                         return -ENOTSUPP;
 396                 }
 397         }
 398
 399         return 0;
 400 }
 401
 402 static const struct pinconf_ops rk805_pinconf_ops = {
 403         .pin_config_get = rk805_pinconf_get,
 404         .pin_config_set = rk805_pinconf_set,
 405 };
 406
 407 static const struct pinctrl_desc rk805_pinctrl_desc = {
 408         .name = "rk805-pinctrl",
 409         .pctlops = &rk805_pinctrl_ops,
 410         .pmxops = &rk805_pinmux_ops,
 411         .confops = &rk805_pinconf_ops,
 412         .owner = THIS_MODULE,
 413 };
 414
 415 static int rk805_pinctrl_probe(struct platform_device *pdev)
 416 {
 417         struct rk805_pctrl_info *pci;
 418         int ret;
 419
 420         pci = devm_kzalloc(&pdev->dev, sizeof(*pci), GFP_KERNEL);
 421         if (!pci)
 422                 return -ENOMEM;
 423
 424         pci->dev = &pdev->dev;
 425         pci->dev->of_node = pdev->dev.parent->of_node;
 426         pci->rk808 = dev_get_drvdata(pdev->dev.parent);
 427
 428         pci->pinctrl_desc = rk805_pinctrl_desc;
 429         pci->gpio_chip = rk805_gpio_chip;
 430         pci->gpio_chip.parent = &pdev->dev;
 431         pci->gpio_chip.of_node = pdev->dev.parent->of_node;
 432
 433         platform_set_drvdata(pdev, pci);
 434
 435         switch (pci->rk808->variant) {
 436         case RK805_ID:
 437                 pci->pins = rk805_pins_desc;
 438                 pci->num_pins = ARRAY_SIZE(rk805_pins_desc);
 439                 pci->functions = rk805_pin_functions;
 440                 pci->num_functions = ARRAY_SIZE(rk805_pin_functions);
 441                 pci->groups = rk805_pin_groups;
 442                 pci->num_pin_groups = ARRAY_SIZE(rk805_pin_groups);
 443                 pci->pinctrl_desc.pins = rk805_pins_desc;
 444                 pci->pinctrl_desc.npins = ARRAY_SIZE(rk805_pins_desc);
 445                 pci->pin_cfg = rk805_gpio_cfgs;
 446                 pci->gpio_chip.ngpio = ARRAY_SIZE(rk805_gpio_cfgs);
 447                 break;
 448         default:
 449                 dev_err(&pdev->dev, "unsupported RK805 ID %lu\n",
 450                         pci->rk808->variant);
 451                 return -EINVAL;
 452         }
 453
 454         /* Add gpio chip */
 455         ret = devm_gpiochip_add_data(&pdev->dev, &pci->gpio_chip, pci);
 456         if (ret < 0) {
 457                 dev_err(&pdev->dev, "Couldn't add gpiochip\n");
 458                 return ret;
 459         }
 460
 461         /* Add pinctrl */
 462         pci->pctl = devm_pinctrl_register(&pdev->dev, &pci->pinctrl_desc, pci);
 463         if (IS_ERR(pci->pctl)) {
 464                 dev_err(&pdev->dev, "Couldn't add pinctrl\n");
 465                 return PTR_ERR(pci->pctl);
 466         }
 467
 468         /* Add pin range */
 469         ret = gpiochip_add_pin_range(&pci->gpio_chip, dev_name(&pdev->dev),
 470                                      0, 0, pci->gpio_chip.ngpio);
 471         if (ret < 0) {
 472                 dev_err(&pdev->dev, "Couldn't add gpiochip pin range\n");
 473                 return ret;
 474         }
 475
 476         return 0;
 477 }
 478
 479 static struct platform_driver rk805_pinctrl_driver = {
 480         .probe = rk805_pinctrl_probe,
 481         .driver = {
 482                 .name = "rk805-pinctrl",
 483         },
 484 };
 485 module_platform_driver(rk805_pinctrl_driver);
 486
 487 MODULE_DESCRIPTION("RK805 pin control and GPIO driver");
 488 MODULE_AUTHOR("Joseph Chen <chenjh@rock-chips.com>");
 489 MODULE_LICENSE("GPL v2");