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1// SPDX-License-Identifier: GPL-2.0+2/*3 * Driver for BCM6328 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 BCM6328_NUM_GPIOS 3222 23#define BCM6328_MODE_REG 0x1824#define BCM6328_MUX_HI_REG 0x1c25#define BCM6328_MUX_LO_REG 0x2026#define BCM6328_MUX_OTHER_REG 0x2427#define BCM6328_MUX_MASK GENMASK(1, 0)28 29struct bcm6328_function {30 const char *name;31 const char * const *groups;32 const unsigned num_groups;33 34 unsigned mode_val:1;35 unsigned mux_val:2;36};37 38static const unsigned int bcm6328_mux[] = {39 BCM6328_MUX_LO_REG,40 BCM6328_MUX_HI_REG,41 BCM6328_MUX_OTHER_REG42};43 44static const struct pinctrl_pin_desc bcm6328_pins[] = {45 PINCTRL_PIN(0, "gpio0"),46 PINCTRL_PIN(1, "gpio1"),47 PINCTRL_PIN(2, "gpio2"),48 PINCTRL_PIN(3, "gpio3"),49 PINCTRL_PIN(4, "gpio4"),50 PINCTRL_PIN(5, "gpio5"),51 PINCTRL_PIN(6, "gpio6"),52 PINCTRL_PIN(7, "gpio7"),53 PINCTRL_PIN(8, "gpio8"),54 PINCTRL_PIN(9, "gpio9"),55 PINCTRL_PIN(10, "gpio10"),56 PINCTRL_PIN(11, "gpio11"),57 PINCTRL_PIN(12, "gpio12"),58 PINCTRL_PIN(13, "gpio13"),59 PINCTRL_PIN(14, "gpio14"),60 PINCTRL_PIN(15, "gpio15"),61 PINCTRL_PIN(16, "gpio16"),62 PINCTRL_PIN(17, "gpio17"),63 PINCTRL_PIN(18, "gpio18"),64 PINCTRL_PIN(19, "gpio19"),65 PINCTRL_PIN(20, "gpio20"),66 PINCTRL_PIN(21, "gpio21"),67 PINCTRL_PIN(22, "gpio22"),68 PINCTRL_PIN(23, "gpio23"),69 PINCTRL_PIN(24, "gpio24"),70 PINCTRL_PIN(25, "gpio25"),71 PINCTRL_PIN(26, "gpio26"),72 PINCTRL_PIN(27, "gpio27"),73 PINCTRL_PIN(28, "gpio28"),74 PINCTRL_PIN(29, "gpio29"),75 PINCTRL_PIN(30, "gpio30"),76 PINCTRL_PIN(31, "gpio31"),77 78 /*79 * No idea where they really are; so let's put them according80 * to their mux offsets.81 */82 PINCTRL_PIN(36, "hsspi_cs1"),83 PINCTRL_PIN(38, "usb_p2"),84};85 86static unsigned gpio0_pins[] = { 0 };87static unsigned gpio1_pins[] = { 1 };88static unsigned gpio2_pins[] = { 2 };89static unsigned gpio3_pins[] = { 3 };90static unsigned gpio4_pins[] = { 4 };91static unsigned gpio5_pins[] = { 5 };92static unsigned gpio6_pins[] = { 6 };93static unsigned gpio7_pins[] = { 7 };94static unsigned gpio8_pins[] = { 8 };95static unsigned gpio9_pins[] = { 9 };96static unsigned gpio10_pins[] = { 10 };97static unsigned gpio11_pins[] = { 11 };98static unsigned gpio12_pins[] = { 12 };99static unsigned gpio13_pins[] = { 13 };100static unsigned gpio14_pins[] = { 14 };101static unsigned gpio15_pins[] = { 15 };102static unsigned gpio16_pins[] = { 16 };103static unsigned gpio17_pins[] = { 17 };104static unsigned gpio18_pins[] = { 18 };105static unsigned gpio19_pins[] = { 19 };106static unsigned gpio20_pins[] = { 20 };107static unsigned gpio21_pins[] = { 21 };108static unsigned gpio22_pins[] = { 22 };109static unsigned gpio23_pins[] = { 23 };110static unsigned gpio24_pins[] = { 24 };111static unsigned gpio25_pins[] = { 25 };112static unsigned gpio26_pins[] = { 26 };113static unsigned gpio27_pins[] = { 27 };114static unsigned gpio28_pins[] = { 28 };115static unsigned gpio29_pins[] = { 29 };116static unsigned gpio30_pins[] = { 30 };117static unsigned gpio31_pins[] = { 31 };118 119static unsigned hsspi_cs1_pins[] = { 36 };120static unsigned usb_port1_pins[] = { 38 };121 122static struct pingroup bcm6328_groups[] = {123 BCM_PIN_GROUP(gpio0),124 BCM_PIN_GROUP(gpio1),125 BCM_PIN_GROUP(gpio2),126 BCM_PIN_GROUP(gpio3),127 BCM_PIN_GROUP(gpio4),128 BCM_PIN_GROUP(gpio5),129 BCM_PIN_GROUP(gpio6),130 BCM_PIN_GROUP(gpio7),131 BCM_PIN_GROUP(gpio8),132 BCM_PIN_GROUP(gpio9),133 BCM_PIN_GROUP(gpio10),134 BCM_PIN_GROUP(gpio11),135 BCM_PIN_GROUP(gpio12),136 BCM_PIN_GROUP(gpio13),137 BCM_PIN_GROUP(gpio14),138 BCM_PIN_GROUP(gpio15),139 BCM_PIN_GROUP(gpio16),140 BCM_PIN_GROUP(gpio17),141 BCM_PIN_GROUP(gpio18),142 BCM_PIN_GROUP(gpio19),143 BCM_PIN_GROUP(gpio20),144 BCM_PIN_GROUP(gpio21),145 BCM_PIN_GROUP(gpio22),146 BCM_PIN_GROUP(gpio23),147 BCM_PIN_GROUP(gpio24),148 BCM_PIN_GROUP(gpio25),149 BCM_PIN_GROUP(gpio26),150 BCM_PIN_GROUP(gpio27),151 BCM_PIN_GROUP(gpio28),152 BCM_PIN_GROUP(gpio29),153 BCM_PIN_GROUP(gpio30),154 BCM_PIN_GROUP(gpio31),155 156 BCM_PIN_GROUP(hsspi_cs1),157 BCM_PIN_GROUP(usb_port1),158};159 160/* GPIO_MODE */161static const char * const led_groups[] = {162 "gpio0",163 "gpio1",164 "gpio2",165 "gpio3",166 "gpio4",167 "gpio5",168 "gpio6",169 "gpio7",170 "gpio8",171 "gpio9",172 "gpio10",173 "gpio11",174 "gpio12",175 "gpio13",176 "gpio14",177 "gpio15",178 "gpio16",179 "gpio17",180 "gpio18",181 "gpio19",182 "gpio20",183 "gpio21",184 "gpio22",185 "gpio23",186};187 188/* PINMUX_SEL */189static const char * const serial_led_data_groups[] = {190 "gpio6",191};192 193static const char * const serial_led_clk_groups[] = {194 "gpio7",195};196 197static const char * const inet_act_led_groups[] = {198 "gpio11",199};200 201static const char * const pcie_clkreq_groups[] = {202 "gpio16",203};204 205static const char * const ephy0_act_led_groups[] = {206 "gpio25",207};208 209static const char * const ephy1_act_led_groups[] = {210 "gpio26",211};212 213static const char * const ephy2_act_led_groups[] = {214 "gpio27",215};216 217static const char * const ephy3_act_led_groups[] = {218 "gpio28",219};220 221static const char * const hsspi_cs1_groups[] = {222 "hsspi_cs1"223};224 225static const char * const usb_host_port_groups[] = {226 "usb_port1",227};228 229static const char * const usb_device_port_groups[] = {230 "usb_port1",231};232 233#define BCM6328_MODE_FUN(n) \234 { \235 .name = #n, \236 .groups = n##_groups, \237 .num_groups = ARRAY_SIZE(n##_groups), \238 .mode_val = 1, \239 }240 241#define BCM6328_MUX_FUN(n, mux) \242 { \243 .name = #n, \244 .groups = n##_groups, \245 .num_groups = ARRAY_SIZE(n##_groups), \246 .mux_val = mux, \247 }248 249static const struct bcm6328_function bcm6328_funcs[] = {250 BCM6328_MODE_FUN(led),251 BCM6328_MUX_FUN(serial_led_data, 2),252 BCM6328_MUX_FUN(serial_led_clk, 2),253 BCM6328_MUX_FUN(inet_act_led, 1),254 BCM6328_MUX_FUN(pcie_clkreq, 2),255 BCM6328_MUX_FUN(ephy0_act_led, 1),256 BCM6328_MUX_FUN(ephy1_act_led, 1),257 BCM6328_MUX_FUN(ephy2_act_led, 1),258 BCM6328_MUX_FUN(ephy3_act_led, 1),259 BCM6328_MUX_FUN(hsspi_cs1, 2),260 BCM6328_MUX_FUN(usb_host_port, 1),261 BCM6328_MUX_FUN(usb_device_port, 2),262};263 264static inline unsigned int bcm6328_mux_off(unsigned int pin)265{266 return bcm6328_mux[pin / 16];267}268 269static int bcm6328_pinctrl_get_group_count(struct pinctrl_dev *pctldev)270{271 return ARRAY_SIZE(bcm6328_groups);272}273 274static const char *bcm6328_pinctrl_get_group_name(struct pinctrl_dev *pctldev,275 unsigned group)276{277 return bcm6328_groups[group].name;278}279 280static int bcm6328_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,281 unsigned group, const unsigned **pins,282 unsigned *npins)283{284 *pins = bcm6328_groups[group].pins;285 *npins = bcm6328_groups[group].npins;286 287 return 0;288}289 290static int bcm6328_pinctrl_get_func_count(struct pinctrl_dev *pctldev)291{292 return ARRAY_SIZE(bcm6328_funcs);293}294 295static const char *bcm6328_pinctrl_get_func_name(struct pinctrl_dev *pctldev,296 unsigned selector)297{298 return bcm6328_funcs[selector].name;299}300 301static int bcm6328_pinctrl_get_groups(struct pinctrl_dev *pctldev,302 unsigned selector,303 const char * const **groups,304 unsigned * const num_groups)305{306 *groups = bcm6328_funcs[selector].groups;307 *num_groups = bcm6328_funcs[selector].num_groups;308 309 return 0;310}311 312static void bcm6328_rmw_mux(struct bcm63xx_pinctrl *pc, unsigned pin,313 unsigned int mode, unsigned int mux)314{315 if (pin < BCM6328_NUM_GPIOS)316 regmap_update_bits(pc->regs, BCM6328_MODE_REG, BIT(pin),317 mode ? BIT(pin) : 0);318 319 regmap_update_bits(pc->regs, bcm6328_mux_off(pin),320 BCM6328_MUX_MASK << ((pin % 16) * 2),321 mux << ((pin % 16) * 2));322}323 324static int bcm6328_pinctrl_set_mux(struct pinctrl_dev *pctldev,325 unsigned selector, unsigned group)326{327 struct bcm63xx_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);328 const struct pingroup *pg = &bcm6328_groups[group];329 const struct bcm6328_function *f = &bcm6328_funcs[selector];330 331 bcm6328_rmw_mux(pc, pg->pins[0], f->mode_val, f->mux_val);332 333 return 0;334}335 336static int bcm6328_gpio_request_enable(struct pinctrl_dev *pctldev,337 struct pinctrl_gpio_range *range,338 unsigned offset)339{340 struct bcm63xx_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);341 342 /* disable all functions using this pin */343 bcm6328_rmw_mux(pc, offset, 0, 0);344 345 return 0;346}347 348static const struct pinctrl_ops bcm6328_pctl_ops = {349 .dt_free_map = pinctrl_utils_free_map,350 .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,351 .get_group_name = bcm6328_pinctrl_get_group_name,352 .get_group_pins = bcm6328_pinctrl_get_group_pins,353 .get_groups_count = bcm6328_pinctrl_get_group_count,354};355 356static const struct pinmux_ops bcm6328_pmx_ops = {357 .get_function_groups = bcm6328_pinctrl_get_groups,358 .get_function_name = bcm6328_pinctrl_get_func_name,359 .get_functions_count = bcm6328_pinctrl_get_func_count,360 .gpio_request_enable = bcm6328_gpio_request_enable,361 .set_mux = bcm6328_pinctrl_set_mux,362 .strict = true,363};364 365static const struct bcm63xx_pinctrl_soc bcm6328_soc = {366 .ngpios = BCM6328_NUM_GPIOS,367 .npins = ARRAY_SIZE(bcm6328_pins),368 .pctl_ops = &bcm6328_pctl_ops,369 .pins = bcm6328_pins,370 .pmx_ops = &bcm6328_pmx_ops,371};372 373static int bcm6328_pinctrl_probe(struct platform_device *pdev)374{375 return bcm63xx_pinctrl_probe(pdev, &bcm6328_soc, NULL);376}377 378static const struct of_device_id bcm6328_pinctrl_match[] = {379 { .compatible = "brcm,bcm6328-pinctrl", },380 { /* sentinel */ }381};382 383static struct platform_driver bcm6328_pinctrl_driver = {384 .probe = bcm6328_pinctrl_probe,385 .driver = {386 .name = "bcm6328-pinctrl",387 .of_match_table = bcm6328_pinctrl_match,388 },389};390 391builtin_platform_driver(bcm6328_pinctrl_driver);392