drivers/pinctrl/pinctrl-ocelot.c

   1 // SPDX-License-Identifier: (GPL-2.0 OR MIT)
   2 /*
   3  * Microsemi SoCs pinctrl driver
   4  *
   5  * Author: <alexandre.belloni@free-electrons.com>
   6  * License: Dual MIT/GPL
   7  * Copyright (c) 2017 Microsemi Corporation
   8  */
   9
  10 #include <linux/gpio/driver.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/io.h>
  13 #include <linux/of_device.h>
  14 #include <linux/of_platform.h>
  15 #include <linux/pinctrl/pinctrl.h>
  16 #include <linux/pinctrl/pinmux.h>
  17 #include <linux/pinctrl/pinconf.h>
  18 #include <linux/pinctrl/pinconf-generic.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/regmap.h>
  21 #include <linux/slab.h>
  22
  23 #include "core.h"
  24 #include "pinconf.h"
  25 #include "pinmux.h"
  26
  27 #define OCELOT_GPIO_OUT_SET     0x0
  28 #define OCELOT_GPIO_OUT_CLR     0x4
  29 #define OCELOT_GPIO_OUT         0x8
  30 #define OCELOT_GPIO_IN          0xc
  31 #define OCELOT_GPIO_OE          0x10
  32 #define OCELOT_GPIO_INTR        0x14
  33 #define OCELOT_GPIO_INTR_ENA    0x18
  34 #define OCELOT_GPIO_INTR_IDENT  0x1c
  35 #define OCELOT_GPIO_ALT0        0x20
  36 #define OCELOT_GPIO_ALT1        0x24
  37 #define OCELOT_GPIO_SD_MAP      0x28
  38
  39 #define OCELOT_PINS             22
  40 #define OCELOT_FUNC_PER_PIN     4
  41
  42 enum {
  43         FUNC_NONE,
  44         FUNC_GPIO,
  45         FUNC_IRQ0_IN,
  46         FUNC_IRQ0_OUT,
  47         FUNC_IRQ1_IN,
  48         FUNC_IRQ1_OUT,
  49         FUNC_MIIM1,
  50         FUNC_PCI_WAKE,
  51         FUNC_PTP0,
  52         FUNC_PTP1,
  53         FUNC_PTP2,
  54         FUNC_PTP3,
  55         FUNC_PWM,
  56         FUNC_RECO_CLK0,
  57         FUNC_RECO_CLK1,
  58         FUNC_SFP0,
  59         FUNC_SFP1,
  60         FUNC_SFP2,
  61         FUNC_SFP3,
  62         FUNC_SFP4,
  63         FUNC_SFP5,
  64         FUNC_SG0,
  65         FUNC_SI,
  66         FUNC_TACHO,
  67         FUNC_TWI,
  68         FUNC_TWI_SCL_M,
  69         FUNC_UART,
  70         FUNC_UART2,
  71         FUNC_MAX
  72 };
  73
  74 static const char *const ocelot_function_names[] = {
  75         [FUNC_NONE]             = "none",
  76         [FUNC_GPIO]             = "gpio",
  77         [FUNC_IRQ0_IN]          = "irq0_in",
  78         [FUNC_IRQ0_OUT]         = "irq0_out",
  79         [FUNC_IRQ1_IN]          = "irq1_in",
  80         [FUNC_IRQ1_OUT]         = "irq1_out",
  81         [FUNC_MIIM1]            = "miim1",
  82         [FUNC_PCI_WAKE]         = "pci_wake",
  83         [FUNC_PTP0]             = "ptp0",
  84         [FUNC_PTP1]             = "ptp1",
  85         [FUNC_PTP2]             = "ptp2",
  86         [FUNC_PTP3]             = "ptp3",
  87         [FUNC_PWM]              = "pwm",
  88         [FUNC_RECO_CLK0]        = "reco_clk0",
  89         [FUNC_RECO_CLK1]        = "reco_clk1",
  90         [FUNC_SFP0]             = "sfp0",
  91         [FUNC_SFP1]             = "sfp1",
  92         [FUNC_SFP2]             = "sfp2",
  93         [FUNC_SFP3]             = "sfp3",
  94         [FUNC_SFP4]             = "sfp4",
  95         [FUNC_SFP5]             = "sfp5",
  96         [FUNC_SG0]              = "sg0",
  97         [FUNC_SI]               = "si",
  98         [FUNC_TACHO]            = "tacho",
  99         [FUNC_TWI]              = "twi",
 100         [FUNC_TWI_SCL_M]        = "twi_scl_m",
 101         [FUNC_UART]             = "uart",
 102         [FUNC_UART2]            = "uart2",
 103 };
 104
 105 struct ocelot_pmx_func {
 106         const char **groups;
 107         unsigned int ngroups;
 108 };
 109
 110 struct ocelot_pin_caps {
 111         unsigned int pin;
 112         unsigned char functions[OCELOT_FUNC_PER_PIN];
 113 };
 114
 115 struct ocelot_pinctrl {
 116         struct device *dev;
 117         struct pinctrl_dev *pctl;
 118         struct gpio_chip gpio_chip;
 119         struct regmap *map;
 120         struct ocelot_pmx_func func[FUNC_MAX];
 121 };
 122
 123 #define OCELOT_P(p, f0, f1, f2)                                         \
 124 static struct ocelot_pin_caps ocelot_pin_##p = {                        \
 125         .pin = p,                                                       \
 126         .functions = {                                                  \
 127                         FUNC_GPIO, FUNC_##f0, FUNC_##f1, FUNC_##f2,     \
 128         },                                                              \
 129 }
 130
 131 OCELOT_P(0,  SG0,       NONE,      NONE);
 132 OCELOT_P(1,  SG0,       NONE,      NONE);
 133 OCELOT_P(2,  SG0,       NONE,      NONE);
 134 OCELOT_P(3,  SG0,       NONE,      NONE);
 135 OCELOT_P(4,  IRQ0_IN,   IRQ0_OUT,  TWI);
 136 OCELOT_P(5,  IRQ1_IN,   IRQ1_OUT,  PCI_WAKE);
 137 OCELOT_P(6,  UART,      TWI_SCL_M, NONE);
 138 OCELOT_P(7,  UART,      TWI_SCL_M, NONE);
 139 OCELOT_P(8,  SI,        TWI_SCL_M, IRQ0_OUT);
 140 OCELOT_P(9,  SI,        TWI_SCL_M, IRQ1_OUT);
 141 OCELOT_P(10, PTP2,      TWI_SCL_M, SFP0);
 142 OCELOT_P(11, PTP3,      TWI_SCL_M, SFP1);
 143 OCELOT_P(12, UART2,     TWI_SCL_M, SFP2);
 144 OCELOT_P(13, UART2,     TWI_SCL_M, SFP3);
 145 OCELOT_P(14, MIIM1,     TWI_SCL_M, SFP4);
 146 OCELOT_P(15, MIIM1,     TWI_SCL_M, SFP5);
 147 OCELOT_P(16, TWI,       NONE,      SI);
 148 OCELOT_P(17, TWI,       TWI_SCL_M, SI);
 149 OCELOT_P(18, PTP0,      TWI_SCL_M, NONE);
 150 OCELOT_P(19, PTP1,      TWI_SCL_M, NONE);
 151 OCELOT_P(20, RECO_CLK0, TACHO,     NONE);
 152 OCELOT_P(21, RECO_CLK1, PWM,       NONE);
 153
 154 #define OCELOT_PIN(n) {                                         \
 155         .number = n,                                            \
 156         .name = "GPIO_"#n,                                      \
 157         .drv_data = &ocelot_pin_##n                             \
 158 }
 159
 160 static const struct pinctrl_pin_desc ocelot_pins[] = {
 161         OCELOT_PIN(0),
 162         OCELOT_PIN(1),
 163         OCELOT_PIN(2),
 164         OCELOT_PIN(3),
 165         OCELOT_PIN(4),
 166         OCELOT_PIN(5),
 167         OCELOT_PIN(6),
 168         OCELOT_PIN(7),
 169         OCELOT_PIN(8),
 170         OCELOT_PIN(9),
 171         OCELOT_PIN(10),
 172         OCELOT_PIN(11),
 173         OCELOT_PIN(12),
 174         OCELOT_PIN(13),
 175         OCELOT_PIN(14),
 176         OCELOT_PIN(15),
 177         OCELOT_PIN(16),
 178         OCELOT_PIN(17),
 179         OCELOT_PIN(18),
 180         OCELOT_PIN(19),
 181         OCELOT_PIN(20),
 182         OCELOT_PIN(21),
 183 };
 184
 185 static int ocelot_get_functions_count(struct pinctrl_dev *pctldev)
 186 {
 187         return ARRAY_SIZE(ocelot_function_names);
 188 }
 189
 190 static const char *ocelot_get_function_name(struct pinctrl_dev *pctldev,
 191                                             unsigned int function)
 192 {
 193         return ocelot_function_names[function];
 194 }
 195
 196 static int ocelot_get_function_groups(struct pinctrl_dev *pctldev,
 197                                       unsigned int function,
 198                                       const char *const **groups,
 199                                       unsigned *const num_groups)
 200 {
 201         struct ocelot_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
 202
 203         *groups  = info->func[function].groups;
 204         *num_groups = info->func[function].ngroups;
 205
 206         return 0;
 207 }
 208
 209 static int ocelot_pin_function_idx(unsigned int pin, unsigned int function)
 210 {
 211         struct ocelot_pin_caps *p = ocelot_pins[pin].drv_data;
 212         int i;
 213
 214         for (i = 0; i < OCELOT_FUNC_PER_PIN; i++) {
 215                 if (function == p->functions[i])
 216                         return i;
 217         }
 218
 219         return -1;
 220 }
 221
 222 static int ocelot_pinmux_set_mux(struct pinctrl_dev *pctldev,
 223                                  unsigned int selector, unsigned int group)
 224 {
 225         struct ocelot_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
 226         struct ocelot_pin_caps *pin = ocelot_pins[group].drv_data;
 227         int f;
 228
 229         f = ocelot_pin_function_idx(group, selector);
 230         if (f < 0)
 231                 return -EINVAL;
 232
 233         /*
 234          * f is encoded on two bits.
 235          * bit 0 of f goes in BIT(pin) of ALT0, bit 1 of f goes in BIT(pin) of
 236          * ALT1
 237          * This is racy because both registers can't be updated at the same time
 238          * but it doesn't matter much for now.
 239          */
 240         regmap_update_bits(info->map, OCELOT_GPIO_ALT0, BIT(pin->pin),
 241                            f << pin->pin);
 242         regmap_update_bits(info->map, OCELOT_GPIO_ALT1, BIT(pin->pin),
 243                            f << (pin->pin - 1));
 244
 245         return 0;
 246 }
 247
 248 static int ocelot_gpio_set_direction(struct pinctrl_dev *pctldev,
 249                                      struct pinctrl_gpio_range *range,
 250                                      unsigned int pin, bool input)
 251 {
 252         struct ocelot_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
 253
 254         regmap_update_bits(info->map, OCELOT_GPIO_OE, BIT(pin),
 255                            input ? 0 : BIT(pin));
 256
 257         return 0;
 258 }
 259
 260 static int ocelot_gpio_request_enable(struct pinctrl_dev *pctldev,
 261                                       struct pinctrl_gpio_range *range,
 262                                       unsigned int offset)
 263 {
 264         struct ocelot_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
 265
 266         regmap_update_bits(info->map, OCELOT_GPIO_ALT0, BIT(offset), 0);
 267         regmap_update_bits(info->map, OCELOT_GPIO_ALT1, BIT(offset), 0);
 268
 269         return 0;
 270 }
 271
 272 static const struct pinmux_ops ocelot_pmx_ops = {
 273         .get_functions_count = ocelot_get_functions_count,
 274         .get_function_name = ocelot_get_function_name,
 275         .get_function_groups = ocelot_get_function_groups,
 276         .set_mux = ocelot_pinmux_set_mux,
 277         .gpio_set_direction = ocelot_gpio_set_direction,
 278         .gpio_request_enable = ocelot_gpio_request_enable,
 279 };
 280
 281 static int ocelot_pctl_get_groups_count(struct pinctrl_dev *pctldev)
 282 {
 283         return ARRAY_SIZE(ocelot_pins);
 284 }
 285
 286 static const char *ocelot_pctl_get_group_name(struct pinctrl_dev *pctldev,
 287                                               unsigned int group)
 288 {
 289         return ocelot_pins[group].name;
 290 }
 291
 292 static int ocelot_pctl_get_group_pins(struct pinctrl_dev *pctldev,
 293                                       unsigned int group,
 294                                       const unsigned int **pins,
 295                                       unsigned int *num_pins)
 296 {
 297         *pins = &ocelot_pins[group].number;
 298         *num_pins = 1;
 299
 300         return 0;
 301 }
 302
 303 static const struct pinctrl_ops ocelot_pctl_ops = {
 304         .get_groups_count = ocelot_pctl_get_groups_count,
 305         .get_group_name = ocelot_pctl_get_group_name,
 306         .get_group_pins = ocelot_pctl_get_group_pins,
 307         .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
 308         .dt_free_map = pinconf_generic_dt_free_map,
 309 };
 310
 311 static struct pinctrl_desc ocelot_desc = {
 312         .name = "ocelot-pinctrl",
 313         .pins = ocelot_pins,
 314         .npins = ARRAY_SIZE(ocelot_pins),
 315         .pctlops = &ocelot_pctl_ops,
 316         .pmxops = &ocelot_pmx_ops,
 317         .owner = THIS_MODULE,
 318 };
 319
 320 static int ocelot_create_group_func_map(struct device *dev,
 321                                         struct ocelot_pinctrl *info)
 322 {
 323         u16 pins[ARRAY_SIZE(ocelot_pins)];
 324         int f, npins, i;
 325
 326         for (f = 0; f < FUNC_MAX; f++) {
 327                 for (npins = 0, i = 0; i < ARRAY_SIZE(ocelot_pins); i++) {
 328                         if (ocelot_pin_function_idx(i, f) >= 0)
 329                                 pins[npins++] = i;
 330                 }
 331
 332                 info->func[f].ngroups = npins;
 333                 info->func[f].groups = devm_kcalloc(dev,
 334                                                          npins,
 335                                                          sizeof(char *),
 336                                                          GFP_KERNEL);
 337                 if (!info->func[f].groups)
 338                         return -ENOMEM;
 339
 340                 for (i = 0; i < npins; i++)
 341                         info->func[f].groups[i] = ocelot_pins[pins[i]].name;
 342         }
 343
 344         return 0;
 345 }
 346
 347 static int ocelot_pinctrl_register(struct platform_device *pdev,
 348                                    struct ocelot_pinctrl *info)
 349 {
 350         int ret;
 351
 352         ret = ocelot_create_group_func_map(&pdev->dev, info);
 353         if (ret) {
 354                 dev_err(&pdev->dev, "Unable to create group func map.\n");
 355                 return ret;
 356         }
 357
 358         info->pctl = devm_pinctrl_register(&pdev->dev, &ocelot_desc, info);
 359         if (IS_ERR(info->pctl)) {
 360                 dev_err(&pdev->dev, "Failed to register pinctrl\n");
 361                 return PTR_ERR(info->pctl);
 362         }
 363
 364         return 0;
 365 }
 366
 367 static int ocelot_gpio_get(struct gpio_chip *chip, unsigned int offset)
 368 {
 369         struct ocelot_pinctrl *info = gpiochip_get_data(chip);
 370         unsigned int val;
 371
 372         regmap_read(info->map, OCELOT_GPIO_IN, &val);
 373
 374         return !!(val & BIT(offset));
 375 }
 376
 377 static void ocelot_gpio_set(struct gpio_chip *chip, unsigned int offset,
 378                             int value)
 379 {
 380         struct ocelot_pinctrl *info = gpiochip_get_data(chip);
 381
 382         if (value)
 383                 regmap_write(info->map, OCELOT_GPIO_OUT_SET, BIT(offset));
 384         else
 385                 regmap_write(info->map, OCELOT_GPIO_OUT_CLR, BIT(offset));
 386 }
 387
 388 static int ocelot_gpio_get_direction(struct gpio_chip *chip,
 389                                      unsigned int offset)
 390 {
 391         struct ocelot_pinctrl *info = gpiochip_get_data(chip);
 392         unsigned int val;
 393
 394         regmap_read(info->map, OCELOT_GPIO_OE, &val);
 395
 396         return !(val & BIT(offset));
 397 }
 398
 399 static int ocelot_gpio_direction_input(struct gpio_chip *chip,
 400                                        unsigned int offset)
 401 {
 402         return pinctrl_gpio_direction_input(chip->base + offset);
 403 }
 404
 405 static int ocelot_gpio_direction_output(struct gpio_chip *chip,
 406                                         unsigned int offset, int value)
 407 {
 408         struct ocelot_pinctrl *info = gpiochip_get_data(chip);
 409         unsigned int pin = BIT(offset);
 410
 411         if (value)
 412                 regmap_write(info->map, OCELOT_GPIO_OUT_SET, pin);
 413         else
 414                 regmap_write(info->map, OCELOT_GPIO_OUT_CLR, pin);
 415
 416         return pinctrl_gpio_direction_output(chip->base + offset);
 417 }
 418
 419 static const struct gpio_chip ocelot_gpiolib_chip = {
 420         .request = gpiochip_generic_request,
 421         .free = gpiochip_generic_free,
 422         .set = ocelot_gpio_set,
 423         .get = ocelot_gpio_get,
 424         .get_direction = ocelot_gpio_get_direction,
 425         .direction_input = ocelot_gpio_direction_input,
 426         .direction_output = ocelot_gpio_direction_output,
 427         .owner = THIS_MODULE,
 428 };
 429
 430 static int ocelot_gpiochip_register(struct platform_device *pdev,
 431                                     struct ocelot_pinctrl *info)
 432 {
 433         struct gpio_chip *gc;
 434         int ret;
 435
 436         info->gpio_chip = ocelot_gpiolib_chip;
 437
 438         gc = &info->gpio_chip;
 439         gc->ngpio = OCELOT_PINS;
 440         gc->parent = &pdev->dev;
 441         gc->base = 0;
 442         gc->of_node = info->dev->of_node;
 443         gc->label = "ocelot-gpio";
 444
 445         ret = devm_gpiochip_add_data(&pdev->dev, gc, info);
 446         if (ret)
 447                 return ret;
 448
 449         /* TODO: this can be used as an irqchip but no board is using that */
 450
 451         return 0;
 452 }
 453
 454 static const struct regmap_config ocelot_pinctrl_regmap_config = {
 455         .reg_bits = 32,
 456         .val_bits = 32,
 457         .reg_stride = 4,
 458         .max_register = 0x64,
 459 };
 460
 461 static const struct of_device_id ocelot_pinctrl_of_match[] = {
 462         { .compatible = "mscc,ocelot-pinctrl" },
 463         {},
 464 };
 465
 466 static int ocelot_pinctrl_probe(struct platform_device *pdev)
 467 {
 468         struct device *dev = &pdev->dev;
 469         struct ocelot_pinctrl *info;
 470         void __iomem *base;
 471         int ret;
 472
 473         info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
 474         if (!info)
 475                 return -ENOMEM;
 476
 477         base = devm_ioremap_resource(dev,
 478                         platform_get_resource(pdev, IORESOURCE_MEM, 0));
 479         if (IS_ERR(base)) {
 480                 dev_err(dev, "Failed to ioremap registers\n");
 481                 return PTR_ERR(base);
 482         }
 483
 484         info->map = devm_regmap_init_mmio(dev, base,
 485                                           &ocelot_pinctrl_regmap_config);
 486         if (IS_ERR(info->map)) {
 487                 dev_err(dev, "Failed to create regmap\n");
 488                 return PTR_ERR(info->map);
 489         }
 490         dev_set_drvdata(dev, info->map);
 491         info->dev = dev;
 492
 493         ret = ocelot_pinctrl_register(pdev, info);
 494         if (ret)
 495                 return ret;
 496
 497         ret = ocelot_gpiochip_register(pdev, info);
 498         if (ret)
 499                 return ret;
 500
 501         return 0;
 502 }
 503
 504 static struct platform_driver ocelot_pinctrl_driver = {
 505         .driver = {
 506                 .name = "pinctrl-ocelot",
 507                 .of_match_table = of_match_ptr(ocelot_pinctrl_of_match),
 508                 .suppress_bind_attrs = true,
 509         },
 510         .probe = ocelot_pinctrl_probe,
 511 };
 512 builtin_platform_driver(ocelot_pinctrl_driver);