drivers/pinctrl/bcm/pinctrl-bcm6368.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Driver for BCM6368 GPIO unit (pinctrl + GPIO)
   4  *
   5  * Copyright (C) 2021 Álvaro Fernández Rojas <noltari@gmail.com>
   6  * Copyright (C) 2016 Jonas Gorski <jonas.gorski@gmail.com>
   7  */
   8
   9 #include <linux/bits.h>
  10 #include <linux/gpio/driver.h>
  11 #include <linux/kernel.h>
  12 #include <linux/of.h>
  13 #include <linux/pinctrl/pinmux.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/regmap.h>
  16
  17 #include "../pinctrl-utils.h"
  18
  19 #include "pinctrl-bcm63xx.h"
  20
  21 #define BCM6368_NUM_GPIOS       38
  22
  23 #define BCM6368_MODE_REG        0x18
  24 #define BCM6368_BASEMODE_REG    0x38
  25 #define  BCM6368_BASEMODE_MASK  0x7
  26 #define  BCM6368_BASEMODE_GPIO  0x0
  27 #define  BCM6368_BASEMODE_UART1 0x1
  28
  29 struct bcm6368_function {
  30         const char *name;
  31         const char * const *groups;
  32         const unsigned num_groups;
  33
  34         unsigned dir_out:16;
  35         unsigned basemode:3;
  36 };
  37
  38 struct bcm6368_priv {
  39         struct regmap_field *overlays;
  40 };
  41
  42 #define BCM6368_BASEMODE_PIN(a, b)              \
  43         {                                       \
  44                 .number = a,                    \
  45                 .name = b,                      \
  46                 .drv_data = (void *)true        \
  47         }
  48
  49 static const struct pinctrl_pin_desc bcm6368_pins[] = {
  50         PINCTRL_PIN(0, "gpio0"),
  51         PINCTRL_PIN(1, "gpio1"),
  52         PINCTRL_PIN(2, "gpio2"),
  53         PINCTRL_PIN(3, "gpio3"),
  54         PINCTRL_PIN(4, "gpio4"),
  55         PINCTRL_PIN(5, "gpio5"),
  56         PINCTRL_PIN(6, "gpio6"),
  57         PINCTRL_PIN(7, "gpio7"),
  58         PINCTRL_PIN(8, "gpio8"),
  59         PINCTRL_PIN(9, "gpio9"),
  60         PINCTRL_PIN(10, "gpio10"),
  61         PINCTRL_PIN(11, "gpio11"),
  62         PINCTRL_PIN(12, "gpio12"),
  63         PINCTRL_PIN(13, "gpio13"),
  64         PINCTRL_PIN(14, "gpio14"),
  65         PINCTRL_PIN(15, "gpio15"),
  66         PINCTRL_PIN(16, "gpio16"),
  67         PINCTRL_PIN(17, "gpio17"),
  68         PINCTRL_PIN(18, "gpio18"),
  69         PINCTRL_PIN(19, "gpio19"),
  70         PINCTRL_PIN(20, "gpio20"),
  71         PINCTRL_PIN(21, "gpio21"),
  72         PINCTRL_PIN(22, "gpio22"),
  73         PINCTRL_PIN(23, "gpio23"),
  74         PINCTRL_PIN(24, "gpio24"),
  75         PINCTRL_PIN(25, "gpio25"),
  76         PINCTRL_PIN(26, "gpio26"),
  77         PINCTRL_PIN(27, "gpio27"),
  78         PINCTRL_PIN(28, "gpio28"),
  79         PINCTRL_PIN(29, "gpio29"),
  80         BCM6368_BASEMODE_PIN(30, "gpio30"),
  81         BCM6368_BASEMODE_PIN(31, "gpio31"),
  82         BCM6368_BASEMODE_PIN(32, "gpio32"),
  83         BCM6368_BASEMODE_PIN(33, "gpio33"),
  84         PINCTRL_PIN(34, "gpio34"),
  85         PINCTRL_PIN(35, "gpio35"),
  86         PINCTRL_PIN(36, "gpio36"),
  87         PINCTRL_PIN(37, "gpio37"),
  88 };
  89
  90 static unsigned gpio0_pins[] = { 0 };
  91 static unsigned gpio1_pins[] = { 1 };
  92 static unsigned gpio2_pins[] = { 2 };
  93 static unsigned gpio3_pins[] = { 3 };
  94 static unsigned gpio4_pins[] = { 4 };
  95 static unsigned gpio5_pins[] = { 5 };
  96 static unsigned gpio6_pins[] = { 6 };
  97 static unsigned gpio7_pins[] = { 7 };
  98 static unsigned gpio8_pins[] = { 8 };
  99 static unsigned gpio9_pins[] = { 9 };
 100 static unsigned gpio10_pins[] = { 10 };
 101 static unsigned gpio11_pins[] = { 11 };
 102 static unsigned gpio12_pins[] = { 12 };
 103 static unsigned gpio13_pins[] = { 13 };
 104 static unsigned gpio14_pins[] = { 14 };
 105 static unsigned gpio15_pins[] = { 15 };
 106 static unsigned gpio16_pins[] = { 16 };
 107 static unsigned gpio17_pins[] = { 17 };
 108 static unsigned gpio18_pins[] = { 18 };
 109 static unsigned gpio19_pins[] = { 19 };
 110 static unsigned gpio20_pins[] = { 20 };
 111 static unsigned gpio21_pins[] = { 21 };
 112 static unsigned gpio22_pins[] = { 22 };
 113 static unsigned gpio23_pins[] = { 23 };
 114 static unsigned gpio24_pins[] = { 24 };
 115 static unsigned gpio25_pins[] = { 25 };
 116 static unsigned gpio26_pins[] = { 26 };
 117 static unsigned gpio27_pins[] = { 27 };
 118 static unsigned gpio28_pins[] = { 28 };
 119 static unsigned gpio29_pins[] = { 29 };
 120 static unsigned gpio30_pins[] = { 30 };
 121 static unsigned gpio31_pins[] = { 31 };
 122 static unsigned uart1_grp_pins[] = { 30, 31, 32, 33 };
 123
 124 static struct pingroup bcm6368_groups[] = {
 125         BCM_PIN_GROUP(gpio0),
 126         BCM_PIN_GROUP(gpio1),
 127         BCM_PIN_GROUP(gpio2),
 128         BCM_PIN_GROUP(gpio3),
 129         BCM_PIN_GROUP(gpio4),
 130         BCM_PIN_GROUP(gpio5),
 131         BCM_PIN_GROUP(gpio6),
 132         BCM_PIN_GROUP(gpio7),
 133         BCM_PIN_GROUP(gpio8),
 134         BCM_PIN_GROUP(gpio9),
 135         BCM_PIN_GROUP(gpio10),
 136         BCM_PIN_GROUP(gpio11),
 137         BCM_PIN_GROUP(gpio12),
 138         BCM_PIN_GROUP(gpio13),
 139         BCM_PIN_GROUP(gpio14),
 140         BCM_PIN_GROUP(gpio15),
 141         BCM_PIN_GROUP(gpio16),
 142         BCM_PIN_GROUP(gpio17),
 143         BCM_PIN_GROUP(gpio18),
 144         BCM_PIN_GROUP(gpio19),
 145         BCM_PIN_GROUP(gpio20),
 146         BCM_PIN_GROUP(gpio21),
 147         BCM_PIN_GROUP(gpio22),
 148         BCM_PIN_GROUP(gpio23),
 149         BCM_PIN_GROUP(gpio24),
 150         BCM_PIN_GROUP(gpio25),
 151         BCM_PIN_GROUP(gpio26),
 152         BCM_PIN_GROUP(gpio27),
 153         BCM_PIN_GROUP(gpio28),
 154         BCM_PIN_GROUP(gpio29),
 155         BCM_PIN_GROUP(gpio30),
 156         BCM_PIN_GROUP(gpio31),
 157         BCM_PIN_GROUP(uart1_grp),
 158 };
 159
 160 static const char * const analog_afe_0_groups[] = {
 161         "gpio0",
 162 };
 163
 164 static const char * const analog_afe_1_groups[] = {
 165         "gpio1",
 166 };
 167
 168 static const char * const sys_irq_groups[] = {
 169         "gpio2",
 170 };
 171
 172 static const char * const serial_led_data_groups[] = {
 173         "gpio3",
 174 };
 175
 176 static const char * const serial_led_clk_groups[] = {
 177         "gpio4",
 178 };
 179
 180 static const char * const inet_led_groups[] = {
 181         "gpio5",
 182 };
 183
 184 static const char * const ephy0_led_groups[] = {
 185         "gpio6",
 186 };
 187
 188 static const char * const ephy1_led_groups[] = {
 189         "gpio7",
 190 };
 191
 192 static const char * const ephy2_led_groups[] = {
 193         "gpio8",
 194 };
 195
 196 static const char * const ephy3_led_groups[] = {
 197         "gpio9",
 198 };
 199
 200 static const char * const robosw_led_data_groups[] = {
 201         "gpio10",
 202 };
 203
 204 static const char * const robosw_led_clk_groups[] = {
 205         "gpio11",
 206 };
 207
 208 static const char * const robosw_led0_groups[] = {
 209         "gpio12",
 210 };
 211
 212 static const char * const robosw_led1_groups[] = {
 213         "gpio13",
 214 };
 215
 216 static const char * const usb_device_led_groups[] = {
 217         "gpio14",
 218 };
 219
 220 static const char * const pci_req1_groups[] = {
 221         "gpio16",
 222 };
 223
 224 static const char * const pci_gnt1_groups[] = {
 225         "gpio17",
 226 };
 227
 228 static const char * const pci_intb_groups[] = {
 229         "gpio18",
 230 };
 231
 232 static const char * const pci_req0_groups[] = {
 233         "gpio19",
 234 };
 235
 236 static const char * const pci_gnt0_groups[] = {
 237         "gpio20",
 238 };
 239
 240 static const char * const pcmcia_cd1_groups[] = {
 241         "gpio22",
 242 };
 243
 244 static const char * const pcmcia_cd2_groups[] = {
 245         "gpio23",
 246 };
 247
 248 static const char * const pcmcia_vs1_groups[] = {
 249         "gpio24",
 250 };
 251
 252 static const char * const pcmcia_vs2_groups[] = {
 253         "gpio25",
 254 };
 255
 256 static const char * const ebi_cs2_groups[] = {
 257         "gpio26",
 258 };
 259
 260 static const char * const ebi_cs3_groups[] = {
 261         "gpio27",
 262 };
 263
 264 static const char * const spi_cs2_groups[] = {
 265         "gpio28",
 266 };
 267
 268 static const char * const spi_cs3_groups[] = {
 269         "gpio29",
 270 };
 271
 272 static const char * const spi_cs4_groups[] = {
 273         "gpio30",
 274 };
 275
 276 static const char * const spi_cs5_groups[] = {
 277         "gpio31",
 278 };
 279
 280 static const char * const uart1_groups[] = {
 281         "uart1_grp",
 282 };
 283
 284 #define BCM6368_FUN(n, out)                             \
 285         {                                               \
 286                 .name = #n,                             \
 287                 .groups = n##_groups,                   \
 288                 .num_groups = ARRAY_SIZE(n##_groups),   \
 289                 .dir_out = out,                         \
 290         }
 291
 292 #define BCM6368_BASEMODE_FUN(n, val, out)               \
 293         {                                               \
 294                 .name = #n,                             \
 295                 .groups = n##_groups,                   \
 296                 .num_groups = ARRAY_SIZE(n##_groups),   \
 297                 .basemode = BCM6368_BASEMODE_##val,     \
 298                 .dir_out = out,                         \
 299         }
 300
 301 static const struct bcm6368_function bcm6368_funcs[] = {
 302         BCM6368_FUN(analog_afe_0, 1),
 303         BCM6368_FUN(analog_afe_1, 1),
 304         BCM6368_FUN(sys_irq, 1),
 305         BCM6368_FUN(serial_led_data, 1),
 306         BCM6368_FUN(serial_led_clk, 1),
 307         BCM6368_FUN(inet_led, 1),
 308         BCM6368_FUN(ephy0_led, 1),
 309         BCM6368_FUN(ephy1_led, 1),
 310         BCM6368_FUN(ephy2_led, 1),
 311         BCM6368_FUN(ephy3_led, 1),
 312         BCM6368_FUN(robosw_led_data, 1),
 313         BCM6368_FUN(robosw_led_clk, 1),
 314         BCM6368_FUN(robosw_led0, 1),
 315         BCM6368_FUN(robosw_led1, 1),
 316         BCM6368_FUN(usb_device_led, 1),
 317         BCM6368_FUN(pci_req1, 0),
 318         BCM6368_FUN(pci_gnt1, 0),
 319         BCM6368_FUN(pci_intb, 0),
 320         BCM6368_FUN(pci_req0, 0),
 321         BCM6368_FUN(pci_gnt0, 0),
 322         BCM6368_FUN(pcmcia_cd1, 0),
 323         BCM6368_FUN(pcmcia_cd2, 0),
 324         BCM6368_FUN(pcmcia_vs1, 0),
 325         BCM6368_FUN(pcmcia_vs2, 0),
 326         BCM6368_FUN(ebi_cs2, 1),
 327         BCM6368_FUN(ebi_cs3, 1),
 328         BCM6368_FUN(spi_cs2, 1),
 329         BCM6368_FUN(spi_cs3, 1),
 330         BCM6368_FUN(spi_cs4, 1),
 331         BCM6368_FUN(spi_cs5, 1),
 332         BCM6368_BASEMODE_FUN(uart1, UART1, 0x6),
 333 };
 334
 335 static int bcm6368_pinctrl_get_group_count(struct pinctrl_dev *pctldev)
 336 {
 337         return ARRAY_SIZE(bcm6368_groups);
 338 }
 339
 340 static const char *bcm6368_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
 341                                                   unsigned group)
 342 {
 343         return bcm6368_groups[group].name;
 344 }
 345
 346 static int bcm6368_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
 347                                           unsigned group, const unsigned **pins,
 348                                           unsigned *npins)
 349 {
 350         *pins = bcm6368_groups[group].pins;
 351         *npins = bcm6368_groups[group].npins;
 352
 353         return 0;
 354 }
 355
 356 static int bcm6368_pinctrl_get_func_count(struct pinctrl_dev *pctldev)
 357 {
 358         return ARRAY_SIZE(bcm6368_funcs);
 359 }
 360
 361 static const char *bcm6368_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
 362                                                  unsigned selector)
 363 {
 364         return bcm6368_funcs[selector].name;
 365 }
 366
 367 static int bcm6368_pinctrl_get_groups(struct pinctrl_dev *pctldev,
 368                                       unsigned selector,
 369                                       const char * const **groups,
 370                                       unsigned * const num_groups)
 371 {
 372         *groups = bcm6368_funcs[selector].groups;
 373         *num_groups = bcm6368_funcs[selector].num_groups;
 374
 375         return 0;
 376 }
 377
 378 static int bcm6368_pinctrl_set_mux(struct pinctrl_dev *pctldev,
 379                                    unsigned selector, unsigned group)
 380 {
 381         struct bcm63xx_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
 382         struct bcm6368_priv *priv = pc->driver_data;
 383         const struct pingroup *pg = &bcm6368_groups[group];
 384         const struct bcm6368_function *fun = &bcm6368_funcs[selector];
 385         int i, pin;
 386
 387         if (fun->basemode) {
 388                 unsigned int mask = 0;
 389
 390                 for (i = 0; i < pg->npins; i++) {
 391                         pin = pg->pins[i];
 392                         if (pin < BCM63XX_BANK_GPIOS)
 393                                 mask |= BIT(pin);
 394                 }
 395
 396                 regmap_update_bits(pc->regs, BCM6368_MODE_REG, mask, 0);
 397                 regmap_field_write(priv->overlays, fun->basemode);
 398         } else {
 399                 pin = pg->pins[0];
 400
 401                 if (bcm6368_pins[pin].drv_data)
 402                         regmap_field_write(priv->overlays,
 403                                            BCM6368_BASEMODE_GPIO);
 404
 405                 regmap_update_bits(pc->regs, BCM6368_MODE_REG, BIT(pin),
 406                                    BIT(pin));
 407         }
 408
 409         for (pin = 0; pin < pg->npins; pin++) {
 410                 struct pinctrl_gpio_range *range;
 411                 int hw_gpio = bcm6368_pins[pin].number;
 412
 413                 range = pinctrl_find_gpio_range_from_pin(pctldev, hw_gpio);
 414                 if (range) {
 415                         struct gpio_chip *gc = range->gc;
 416
 417                         if (fun->dir_out & BIT(pin))
 418                                 gc->direction_output(gc, hw_gpio, 0);
 419                         else
 420                                 gc->direction_input(gc, hw_gpio);
 421                 }
 422         }
 423
 424         return 0;
 425 }
 426
 427 static int bcm6368_gpio_request_enable(struct pinctrl_dev *pctldev,
 428                                        struct pinctrl_gpio_range *range,
 429                                        unsigned offset)
 430 {
 431         struct bcm63xx_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
 432         struct bcm6368_priv *priv = pc->driver_data;
 433
 434         if (offset >= BCM63XX_BANK_GPIOS && !bcm6368_pins[offset].drv_data)
 435                 return 0;
 436
 437         /* disable all functions using this pin */
 438         if (offset < BCM63XX_BANK_GPIOS)
 439                 regmap_update_bits(pc->regs, BCM6368_MODE_REG, BIT(offset), 0);
 440
 441         if (bcm6368_pins[offset].drv_data)
 442                 regmap_field_write(priv->overlays, BCM6368_BASEMODE_GPIO);
 443
 444         return 0;
 445 }
 446
 447 static const struct pinctrl_ops bcm6368_pctl_ops = {
 448         .dt_free_map = pinctrl_utils_free_map,
 449         .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
 450         .get_group_name = bcm6368_pinctrl_get_group_name,
 451         .get_group_pins = bcm6368_pinctrl_get_group_pins,
 452         .get_groups_count = bcm6368_pinctrl_get_group_count,
 453 };
 454
 455 static const struct pinmux_ops bcm6368_pmx_ops = {
 456         .get_function_groups = bcm6368_pinctrl_get_groups,
 457         .get_function_name = bcm6368_pinctrl_get_func_name,
 458         .get_functions_count = bcm6368_pinctrl_get_func_count,
 459         .gpio_request_enable = bcm6368_gpio_request_enable,
 460         .set_mux = bcm6368_pinctrl_set_mux,
 461         .strict = true,
 462 };
 463
 464 static const struct bcm63xx_pinctrl_soc bcm6368_soc = {
 465         .ngpios = BCM6368_NUM_GPIOS,
 466         .npins = ARRAY_SIZE(bcm6368_pins),
 467         .pctl_ops = &bcm6368_pctl_ops,
 468         .pins = bcm6368_pins,
 469         .pmx_ops = &bcm6368_pmx_ops,
 470 };
 471
 472 static int bcm6368_pinctrl_probe(struct platform_device *pdev)
 473 {
 474         struct reg_field overlays = REG_FIELD(BCM6368_BASEMODE_REG, 0, 15);
 475         struct device *dev = &pdev->dev;
 476         struct bcm63xx_pinctrl *pc;
 477         struct bcm6368_priv *priv;
 478         int err;
 479
 480         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 481         if (!priv)
 482                 return -ENOMEM;
 483
 484         err = bcm63xx_pinctrl_probe(pdev, &bcm6368_soc, (void *) priv);
 485         if (err)
 486                 return err;
 487
 488         pc = platform_get_drvdata(pdev);
 489
 490         priv->overlays = devm_regmap_field_alloc(dev, pc->regs, overlays);
 491         if (IS_ERR(priv->overlays))
 492                 return PTR_ERR(priv->overlays);
 493
 494         return 0;
 495 }
 496
 497 static const struct of_device_id bcm6368_pinctrl_match[] = {
 498         { .compatible = "brcm,bcm6368-pinctrl", },
 499         { /* sentinel */ }
 500 };
 501
 502 static struct platform_driver bcm6368_pinctrl_driver = {
 503         .probe = bcm6368_pinctrl_probe,
 504         .driver = {
 505                 .name = "bcm6368-pinctrl",
 506                 .of_match_table = bcm6368_pinctrl_match,
 507         },
 508 };
 509
 510 builtin_platform_driver(bcm6368_pinctrl_driver);