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_pingroup { 30 const char *name; 31 const unsigned * const pins; 32 const unsigned num_pins; 33 }; 34 35 struct bcm6368_function { 36 const char *name; 37 const char * const *groups; 38 const unsigned num_groups; 39 40 unsigned dir_out:16; 41 unsigned basemode:3; 42 }; 43 44 struct bcm6368_priv { 45 struct regmap_field *overlays; 46 }; 47 48 #define BCM6368_BASEMODE_PIN(a, b) \ 49 { \ 50 .number = a, \ 51 .name = b, \ 52 .drv_data = (void *)true \ 53 } 54 55 static const struct pinctrl_pin_desc bcm6368_pins[] = { 56 PINCTRL_PIN(0, "gpio0"), 57 PINCTRL_PIN(1, "gpio1"), 58 PINCTRL_PIN(2, "gpio2"), 59 PINCTRL_PIN(3, "gpio3"), 60 PINCTRL_PIN(4, "gpio4"), 61 PINCTRL_PIN(5, "gpio5"), 62 PINCTRL_PIN(6, "gpio6"), 63 PINCTRL_PIN(7, "gpio7"), 64 PINCTRL_PIN(8, "gpio8"), 65 PINCTRL_PIN(9, "gpio9"), 66 PINCTRL_PIN(10, "gpio10"), 67 PINCTRL_PIN(11, "gpio11"), 68 PINCTRL_PIN(12, "gpio12"), 69 PINCTRL_PIN(13, "gpio13"), 70 PINCTRL_PIN(14, "gpio14"), 71 PINCTRL_PIN(15, "gpio15"), 72 PINCTRL_PIN(16, "gpio16"), 73 PINCTRL_PIN(17, "gpio17"), 74 PINCTRL_PIN(18, "gpio18"), 75 PINCTRL_PIN(19, "gpio19"), 76 PINCTRL_PIN(20, "gpio20"), 77 PINCTRL_PIN(21, "gpio21"), 78 PINCTRL_PIN(22, "gpio22"), 79 PINCTRL_PIN(23, "gpio23"), 80 PINCTRL_PIN(24, "gpio24"), 81 PINCTRL_PIN(25, "gpio25"), 82 PINCTRL_PIN(26, "gpio26"), 83 PINCTRL_PIN(27, "gpio27"), 84 PINCTRL_PIN(28, "gpio28"), 85 PINCTRL_PIN(29, "gpio29"), 86 BCM6368_BASEMODE_PIN(30, "gpio30"), 87 BCM6368_BASEMODE_PIN(31, "gpio31"), 88 BCM6368_BASEMODE_PIN(32, "gpio32"), 89 BCM6368_BASEMODE_PIN(33, "gpio33"), 90 PINCTRL_PIN(34, "gpio34"), 91 PINCTRL_PIN(35, "gpio35"), 92 PINCTRL_PIN(36, "gpio36"), 93 PINCTRL_PIN(37, "gpio37"), 94 }; 95 96 static unsigned gpio0_pins[] = { 0 }; 97 static unsigned gpio1_pins[] = { 1 }; 98 static unsigned gpio2_pins[] = { 2 }; 99 static unsigned gpio3_pins[] = { 3 }; 100 static unsigned gpio4_pins[] = { 4 }; 101 static unsigned gpio5_pins[] = { 5 }; 102 static unsigned gpio6_pins[] = { 6 }; 103 static unsigned gpio7_pins[] = { 7 }; 104 static unsigned gpio8_pins[] = { 8 }; 105 static unsigned gpio9_pins[] = { 9 }; 106 static unsigned gpio10_pins[] = { 10 }; 107 static unsigned gpio11_pins[] = { 11 }; 108 static unsigned gpio12_pins[] = { 12 }; 109 static unsigned gpio13_pins[] = { 13 }; 110 static unsigned gpio14_pins[] = { 14 }; 111 static unsigned gpio15_pins[] = { 15 }; 112 static unsigned gpio16_pins[] = { 16 }; 113 static unsigned gpio17_pins[] = { 17 }; 114 static unsigned gpio18_pins[] = { 18 }; 115 static unsigned gpio19_pins[] = { 19 }; 116 static unsigned gpio20_pins[] = { 20 }; 117 static unsigned gpio21_pins[] = { 21 }; 118 static unsigned gpio22_pins[] = { 22 }; 119 static unsigned gpio23_pins[] = { 23 }; 120 static unsigned gpio24_pins[] = { 24 }; 121 static unsigned gpio25_pins[] = { 25 }; 122 static unsigned gpio26_pins[] = { 26 }; 123 static unsigned gpio27_pins[] = { 27 }; 124 static unsigned gpio28_pins[] = { 28 }; 125 static unsigned gpio29_pins[] = { 29 }; 126 static unsigned gpio30_pins[] = { 30 }; 127 static unsigned gpio31_pins[] = { 31 }; 128 static unsigned uart1_grp_pins[] = { 30, 31, 32, 33 }; 129 130 #define BCM6368_GROUP(n) \ 131 { \ 132 .name = #n, \ 133 .pins = n##_pins, \ 134 .num_pins = ARRAY_SIZE(n##_pins), \ 135 } 136 137 static struct bcm6368_pingroup bcm6368_groups[] = { 138 BCM6368_GROUP(gpio0), 139 BCM6368_GROUP(gpio1), 140 BCM6368_GROUP(gpio2), 141 BCM6368_GROUP(gpio3), 142 BCM6368_GROUP(gpio4), 143 BCM6368_GROUP(gpio5), 144 BCM6368_GROUP(gpio6), 145 BCM6368_GROUP(gpio7), 146 BCM6368_GROUP(gpio8), 147 BCM6368_GROUP(gpio9), 148 BCM6368_GROUP(gpio10), 149 BCM6368_GROUP(gpio11), 150 BCM6368_GROUP(gpio12), 151 BCM6368_GROUP(gpio13), 152 BCM6368_GROUP(gpio14), 153 BCM6368_GROUP(gpio15), 154 BCM6368_GROUP(gpio16), 155 BCM6368_GROUP(gpio17), 156 BCM6368_GROUP(gpio18), 157 BCM6368_GROUP(gpio19), 158 BCM6368_GROUP(gpio20), 159 BCM6368_GROUP(gpio21), 160 BCM6368_GROUP(gpio22), 161 BCM6368_GROUP(gpio23), 162 BCM6368_GROUP(gpio24), 163 BCM6368_GROUP(gpio25), 164 BCM6368_GROUP(gpio26), 165 BCM6368_GROUP(gpio27), 166 BCM6368_GROUP(gpio28), 167 BCM6368_GROUP(gpio29), 168 BCM6368_GROUP(gpio30), 169 BCM6368_GROUP(gpio31), 170 BCM6368_GROUP(uart1_grp), 171 }; 172 173 static const char * const analog_afe_0_groups[] = { 174 "gpio0", 175 }; 176 177 static const char * const analog_afe_1_groups[] = { 178 "gpio1", 179 }; 180 181 static const char * const sys_irq_groups[] = { 182 "gpio2", 183 }; 184 185 static const char * const serial_led_data_groups[] = { 186 "gpio3", 187 }; 188 189 static const char * const serial_led_clk_groups[] = { 190 "gpio4", 191 }; 192 193 static const char * const inet_led_groups[] = { 194 "gpio5", 195 }; 196 197 static const char * const ephy0_led_groups[] = { 198 "gpio6", 199 }; 200 201 static const char * const ephy1_led_groups[] = { 202 "gpio7", 203 }; 204 205 static const char * const ephy2_led_groups[] = { 206 "gpio8", 207 }; 208 209 static const char * const ephy3_led_groups[] = { 210 "gpio9", 211 }; 212 213 static const char * const robosw_led_data_groups[] = { 214 "gpio10", 215 }; 216 217 static const char * const robosw_led_clk_groups[] = { 218 "gpio11", 219 }; 220 221 static const char * const robosw_led0_groups[] = { 222 "gpio12", 223 }; 224 225 static const char * const robosw_led1_groups[] = { 226 "gpio13", 227 }; 228 229 static const char * const usb_device_led_groups[] = { 230 "gpio14", 231 }; 232 233 static const char * const pci_req1_groups[] = { 234 "gpio16", 235 }; 236 237 static const char * const pci_gnt1_groups[] = { 238 "gpio17", 239 }; 240 241 static const char * const pci_intb_groups[] = { 242 "gpio18", 243 }; 244 245 static const char * const pci_req0_groups[] = { 246 "gpio19", 247 }; 248 249 static const char * const pci_gnt0_groups[] = { 250 "gpio20", 251 }; 252 253 static const char * const pcmcia_cd1_groups[] = { 254 "gpio22", 255 }; 256 257 static const char * const pcmcia_cd2_groups[] = { 258 "gpio23", 259 }; 260 261 static const char * const pcmcia_vs1_groups[] = { 262 "gpio24", 263 }; 264 265 static const char * const pcmcia_vs2_groups[] = { 266 "gpio25", 267 }; 268 269 static const char * const ebi_cs2_groups[] = { 270 "gpio26", 271 }; 272 273 static const char * const ebi_cs3_groups[] = { 274 "gpio27", 275 }; 276 277 static const char * const spi_cs2_groups[] = { 278 "gpio28", 279 }; 280 281 static const char * const spi_cs3_groups[] = { 282 "gpio29", 283 }; 284 285 static const char * const spi_cs4_groups[] = { 286 "gpio30", 287 }; 288 289 static const char * const spi_cs5_groups[] = { 290 "gpio31", 291 }; 292 293 static const char * const uart1_groups[] = { 294 "uart1_grp", 295 }; 296 297 #define BCM6368_FUN(n, out) \ 298 { \ 299 .name = #n, \ 300 .groups = n##_groups, \ 301 .num_groups = ARRAY_SIZE(n##_groups), \ 302 .dir_out = out, \ 303 } 304 305 #define BCM6368_BASEMODE_FUN(n, val, out) \ 306 { \ 307 .name = #n, \ 308 .groups = n##_groups, \ 309 .num_groups = ARRAY_SIZE(n##_groups), \ 310 .basemode = BCM6368_BASEMODE_##val, \ 311 .dir_out = out, \ 312 } 313 314 static const struct bcm6368_function bcm6368_funcs[] = { 315 BCM6368_FUN(analog_afe_0, 1), 316 BCM6368_FUN(analog_afe_1, 1), 317 BCM6368_FUN(sys_irq, 1), 318 BCM6368_FUN(serial_led_data, 1), 319 BCM6368_FUN(serial_led_clk, 1), 320 BCM6368_FUN(inet_led, 1), 321 BCM6368_FUN(ephy0_led, 1), 322 BCM6368_FUN(ephy1_led, 1), 323 BCM6368_FUN(ephy2_led, 1), 324 BCM6368_FUN(ephy3_led, 1), 325 BCM6368_FUN(robosw_led_data, 1), 326 BCM6368_FUN(robosw_led_clk, 1), 327 BCM6368_FUN(robosw_led0, 1), 328 BCM6368_FUN(robosw_led1, 1), 329 BCM6368_FUN(usb_device_led, 1), 330 BCM6368_FUN(pci_req1, 0), 331 BCM6368_FUN(pci_gnt1, 0), 332 BCM6368_FUN(pci_intb, 0), 333 BCM6368_FUN(pci_req0, 0), 334 BCM6368_FUN(pci_gnt0, 0), 335 BCM6368_FUN(pcmcia_cd1, 0), 336 BCM6368_FUN(pcmcia_cd2, 0), 337 BCM6368_FUN(pcmcia_vs1, 0), 338 BCM6368_FUN(pcmcia_vs2, 0), 339 BCM6368_FUN(ebi_cs2, 1), 340 BCM6368_FUN(ebi_cs3, 1), 341 BCM6368_FUN(spi_cs2, 1), 342 BCM6368_FUN(spi_cs3, 1), 343 BCM6368_FUN(spi_cs4, 1), 344 BCM6368_FUN(spi_cs5, 1), 345 BCM6368_BASEMODE_FUN(uart1, UART1, 0x6), 346 }; 347 348 static int bcm6368_pinctrl_get_group_count(struct pinctrl_dev *pctldev) 349 { 350 return ARRAY_SIZE(bcm6368_groups); 351 } 352 353 static const char *bcm6368_pinctrl_get_group_name(struct pinctrl_dev *pctldev, 354 unsigned group) 355 { 356 return bcm6368_groups[group].name; 357 } 358 359 static int bcm6368_pinctrl_get_group_pins(struct pinctrl_dev *pctldev, 360 unsigned group, const unsigned **pins, 361 unsigned *num_pins) 362 { 363 *pins = bcm6368_groups[group].pins; 364 *num_pins = bcm6368_groups[group].num_pins; 365 366 return 0; 367 } 368 369 static int bcm6368_pinctrl_get_func_count(struct pinctrl_dev *pctldev) 370 { 371 return ARRAY_SIZE(bcm6368_funcs); 372 } 373 374 static const char *bcm6368_pinctrl_get_func_name(struct pinctrl_dev *pctldev, 375 unsigned selector) 376 { 377 return bcm6368_funcs[selector].name; 378 } 379 380 static int bcm6368_pinctrl_get_groups(struct pinctrl_dev *pctldev, 381 unsigned selector, 382 const char * const **groups, 383 unsigned * const num_groups) 384 { 385 *groups = bcm6368_funcs[selector].groups; 386 *num_groups = bcm6368_funcs[selector].num_groups; 387 388 return 0; 389 } 390 391 static int bcm6368_pinctrl_set_mux(struct pinctrl_dev *pctldev, 392 unsigned selector, unsigned group) 393 { 394 struct bcm63xx_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); 395 struct bcm6368_priv *priv = pc->driver_data; 396 const struct bcm6368_pingroup *pg = &bcm6368_groups[group]; 397 const struct bcm6368_function *fun = &bcm6368_funcs[selector]; 398 int i, pin; 399 400 if (fun->basemode) { 401 unsigned int mask = 0; 402 403 for (i = 0; i < pg->num_pins; i++) { 404 pin = pg->pins[i]; 405 if (pin < BCM63XX_BANK_GPIOS) 406 mask |= BIT(pin); 407 } 408 409 regmap_update_bits(pc->regs, BCM6368_MODE_REG, mask, 0); 410 regmap_field_write(priv->overlays, fun->basemode); 411 } else { 412 pin = pg->pins[0]; 413 414 if (bcm6368_pins[pin].drv_data) 415 regmap_field_write(priv->overlays, 416 BCM6368_BASEMODE_GPIO); 417 418 regmap_update_bits(pc->regs, BCM6368_MODE_REG, BIT(pin), 419 BIT(pin)); 420 } 421 422 for (pin = 0; pin < pg->num_pins; pin++) { 423 struct pinctrl_gpio_range *range; 424 int hw_gpio = bcm6368_pins[pin].number; 425 426 range = pinctrl_find_gpio_range_from_pin(pctldev, hw_gpio); 427 if (range) { 428 struct gpio_chip *gc = range->gc; 429 430 if (fun->dir_out & BIT(pin)) 431 gc->direction_output(gc, hw_gpio, 0); 432 else 433 gc->direction_input(gc, hw_gpio); 434 } 435 } 436 437 return 0; 438 } 439 440 static int bcm6368_gpio_request_enable(struct pinctrl_dev *pctldev, 441 struct pinctrl_gpio_range *range, 442 unsigned offset) 443 { 444 struct bcm63xx_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); 445 struct bcm6368_priv *priv = pc->driver_data; 446 447 if (offset >= BCM63XX_BANK_GPIOS && !bcm6368_pins[offset].drv_data) 448 return 0; 449 450 /* disable all functions using this pin */ 451 if (offset < BCM63XX_BANK_GPIOS) 452 regmap_update_bits(pc->regs, BCM6368_MODE_REG, BIT(offset), 0); 453 454 if (bcm6368_pins[offset].drv_data) 455 regmap_field_write(priv->overlays, BCM6368_BASEMODE_GPIO); 456 457 return 0; 458 } 459 460 static const struct pinctrl_ops bcm6368_pctl_ops = { 461 .dt_free_map = pinctrl_utils_free_map, 462 .dt_node_to_map = pinconf_generic_dt_node_to_map_pin, 463 .get_group_name = bcm6368_pinctrl_get_group_name, 464 .get_group_pins = bcm6368_pinctrl_get_group_pins, 465 .get_groups_count = bcm6368_pinctrl_get_group_count, 466 }; 467 468 static const struct pinmux_ops bcm6368_pmx_ops = { 469 .get_function_groups = bcm6368_pinctrl_get_groups, 470 .get_function_name = bcm6368_pinctrl_get_func_name, 471 .get_functions_count = bcm6368_pinctrl_get_func_count, 472 .gpio_request_enable = bcm6368_gpio_request_enable, 473 .set_mux = bcm6368_pinctrl_set_mux, 474 .strict = true, 475 }; 476 477 static const struct bcm63xx_pinctrl_soc bcm6368_soc = { 478 .ngpios = BCM6368_NUM_GPIOS, 479 .npins = ARRAY_SIZE(bcm6368_pins), 480 .pctl_ops = &bcm6368_pctl_ops, 481 .pins = bcm6368_pins, 482 .pmx_ops = &bcm6368_pmx_ops, 483 }; 484 485 static int bcm6368_pinctrl_probe(struct platform_device *pdev) 486 { 487 struct reg_field overlays = REG_FIELD(BCM6368_BASEMODE_REG, 0, 15); 488 struct device *dev = &pdev->dev; 489 struct bcm63xx_pinctrl *pc; 490 struct bcm6368_priv *priv; 491 int err; 492 493 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 494 if (!priv) 495 return -ENOMEM; 496 497 err = bcm63xx_pinctrl_probe(pdev, &bcm6368_soc, (void *) priv); 498 if (err) 499 return err; 500 501 pc = platform_get_drvdata(pdev); 502 503 priv->overlays = devm_regmap_field_alloc(dev, pc->regs, overlays); 504 if (IS_ERR(priv->overlays)) 505 return PTR_ERR(priv->overlays); 506 507 return 0; 508 } 509 510 static const struct of_device_id bcm6368_pinctrl_match[] = { 511 { .compatible = "brcm,bcm6368-pinctrl", }, 512 { /* sentinel */ } 513 }; 514 515 static struct platform_driver bcm6368_pinctrl_driver = { 516 .probe = bcm6368_pinctrl_probe, 517 .driver = { 518 .name = "bcm6368-pinctrl", 519 .of_match_table = bcm6368_pinctrl_match, 520 }, 521 }; 522 523 builtin_platform_driver(bcm6368_pinctrl_driver); 524