511 lines · 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 3822 23#define BCM6368_MODE_REG 0x1824#define BCM6368_BASEMODE_REG 0x3825#define BCM6368_BASEMODE_MASK 0x726#define BCM6368_BASEMODE_GPIO 0x027#define BCM6368_BASEMODE_UART1 0x128 29struct 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 38struct 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 49static 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 90static unsigned gpio0_pins[] = { 0 };91static unsigned gpio1_pins[] = { 1 };92static unsigned gpio2_pins[] = { 2 };93static unsigned gpio3_pins[] = { 3 };94static unsigned gpio4_pins[] = { 4 };95static unsigned gpio5_pins[] = { 5 };96static unsigned gpio6_pins[] = { 6 };97static unsigned gpio7_pins[] = { 7 };98static unsigned gpio8_pins[] = { 8 };99static unsigned gpio9_pins[] = { 9 };100static unsigned gpio10_pins[] = { 10 };101static unsigned gpio11_pins[] = { 11 };102static unsigned gpio12_pins[] = { 12 };103static unsigned gpio13_pins[] = { 13 };104static unsigned gpio14_pins[] = { 14 };105static unsigned gpio15_pins[] = { 15 };106static unsigned gpio16_pins[] = { 16 };107static unsigned gpio17_pins[] = { 17 };108static unsigned gpio18_pins[] = { 18 };109static unsigned gpio19_pins[] = { 19 };110static unsigned gpio20_pins[] = { 20 };111static unsigned gpio21_pins[] = { 21 };112static unsigned gpio22_pins[] = { 22 };113static unsigned gpio23_pins[] = { 23 };114static unsigned gpio24_pins[] = { 24 };115static unsigned gpio25_pins[] = { 25 };116static unsigned gpio26_pins[] = { 26 };117static unsigned gpio27_pins[] = { 27 };118static unsigned gpio28_pins[] = { 28 };119static unsigned gpio29_pins[] = { 29 };120static unsigned gpio30_pins[] = { 30 };121static unsigned gpio31_pins[] = { 31 };122static unsigned uart1_grp_pins[] = { 30, 31, 32, 33 };123 124static 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 160static const char * const analog_afe_0_groups[] = {161 "gpio0",162};163 164static const char * const analog_afe_1_groups[] = {165 "gpio1",166};167 168static const char * const sys_irq_groups[] = {169 "gpio2",170};171 172static const char * const serial_led_data_groups[] = {173 "gpio3",174};175 176static const char * const serial_led_clk_groups[] = {177 "gpio4",178};179 180static const char * const inet_led_groups[] = {181 "gpio5",182};183 184static const char * const ephy0_led_groups[] = {185 "gpio6",186};187 188static const char * const ephy1_led_groups[] = {189 "gpio7",190};191 192static const char * const ephy2_led_groups[] = {193 "gpio8",194};195 196static const char * const ephy3_led_groups[] = {197 "gpio9",198};199 200static const char * const robosw_led_data_groups[] = {201 "gpio10",202};203 204static const char * const robosw_led_clk_groups[] = {205 "gpio11",206};207 208static const char * const robosw_led0_groups[] = {209 "gpio12",210};211 212static const char * const robosw_led1_groups[] = {213 "gpio13",214};215 216static const char * const usb_device_led_groups[] = {217 "gpio14",218};219 220static const char * const pci_req1_groups[] = {221 "gpio16",222};223 224static const char * const pci_gnt1_groups[] = {225 "gpio17",226};227 228static const char * const pci_intb_groups[] = {229 "gpio18",230};231 232static const char * const pci_req0_groups[] = {233 "gpio19",234};235 236static const char * const pci_gnt0_groups[] = {237 "gpio20",238};239 240static const char * const pcmcia_cd1_groups[] = {241 "gpio22",242};243 244static const char * const pcmcia_cd2_groups[] = {245 "gpio23",246};247 248static const char * const pcmcia_vs1_groups[] = {249 "gpio24",250};251 252static const char * const pcmcia_vs2_groups[] = {253 "gpio25",254};255 256static const char * const ebi_cs2_groups[] = {257 "gpio26",258};259 260static const char * const ebi_cs3_groups[] = {261 "gpio27",262};263 264static const char * const spi_cs2_groups[] = {265 "gpio28",266};267 268static const char * const spi_cs3_groups[] = {269 "gpio29",270};271 272static const char * const spi_cs4_groups[] = {273 "gpio30",274};275 276static const char * const spi_cs5_groups[] = {277 "gpio31",278};279 280static 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 301static 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 335static int bcm6368_pinctrl_get_group_count(struct pinctrl_dev *pctldev)336{337 return ARRAY_SIZE(bcm6368_groups);338}339 340static const char *bcm6368_pinctrl_get_group_name(struct pinctrl_dev *pctldev,341 unsigned group)342{343 return bcm6368_groups[group].name;344}345 346static 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 356static int bcm6368_pinctrl_get_func_count(struct pinctrl_dev *pctldev)357{358 return ARRAY_SIZE(bcm6368_funcs);359}360 361static const char *bcm6368_pinctrl_get_func_name(struct pinctrl_dev *pctldev,362 unsigned selector)363{364 return bcm6368_funcs[selector].name;365}366 367static 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 378static 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 else420 gc->direction_input(gc, hw_gpio);421 }422 }423 424 return 0;425}426 427static 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 447static 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 455static 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 464static 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 472static 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 497static const struct of_device_id bcm6368_pinctrl_match[] = {498 { .compatible = "brcm,bcm6368-pinctrl", },499 { /* sentinel */ }500};501 502static 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 510builtin_platform_driver(bcm6368_pinctrl_driver);511