366 lines · c
1// SPDX-License-Identifier: GPL-2.0+2/*3 * Driver for BCM6358 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 BCM6358_NUM_GPIOS 4022 23#define BCM6358_MODE_REG 0x1824#define BCM6358_MODE_MUX_NONE 025#define BCM6358_MODE_MUX_EBI_CS BIT(5)26#define BCM6358_MODE_MUX_UART1 BIT(6)27#define BCM6358_MODE_MUX_SPI_CS BIT(7)28#define BCM6358_MODE_MUX_ASYNC_MODEM BIT(8)29#define BCM6358_MODE_MUX_LEGACY_LED BIT(9)30#define BCM6358_MODE_MUX_SERIAL_LED BIT(10)31#define BCM6358_MODE_MUX_LED BIT(11)32#define BCM6358_MODE_MUX_UTOPIA BIT(12)33#define BCM6358_MODE_MUX_CLKRST BIT(13)34#define BCM6358_MODE_MUX_PWM_SYN_CLK BIT(14)35#define BCM6358_MODE_MUX_SYS_IRQ BIT(15)36 37struct bcm6358_pingroup {38 struct pingroup grp;39 40 const uint16_t mode_val;41 42 /* non-GPIO function muxes require the gpio direction to be set */43 const uint16_t direction;44};45 46struct bcm6358_function {47 const char *name;48 const char * const *groups;49 const unsigned num_groups;50};51 52struct bcm6358_priv {53 struct regmap_field *overlays;54};55 56#define BCM6358_GPIO_PIN(a, b, bit1, bit2, bit3) \57 { \58 .number = a, \59 .name = b, \60 .drv_data = (void *)(BCM6358_MODE_MUX_##bit1 | \61 BCM6358_MODE_MUX_##bit2 | \62 BCM6358_MODE_MUX_##bit3), \63 }64 65static const struct pinctrl_pin_desc bcm6358_pins[] = {66 BCM6358_GPIO_PIN(0, "gpio0", LED, NONE, NONE),67 BCM6358_GPIO_PIN(1, "gpio1", LED, NONE, NONE),68 BCM6358_GPIO_PIN(2, "gpio2", LED, NONE, NONE),69 BCM6358_GPIO_PIN(3, "gpio3", LED, NONE, NONE),70 PINCTRL_PIN(4, "gpio4"),71 BCM6358_GPIO_PIN(5, "gpio5", SYS_IRQ, NONE, NONE),72 BCM6358_GPIO_PIN(6, "gpio6", SERIAL_LED, NONE, NONE),73 BCM6358_GPIO_PIN(7, "gpio7", SERIAL_LED, NONE, NONE),74 BCM6358_GPIO_PIN(8, "gpio8", PWM_SYN_CLK, NONE, NONE),75 BCM6358_GPIO_PIN(9, "gpio09", LEGACY_LED, NONE, NONE),76 BCM6358_GPIO_PIN(10, "gpio10", LEGACY_LED, NONE, NONE),77 BCM6358_GPIO_PIN(11, "gpio11", LEGACY_LED, NONE, NONE),78 BCM6358_GPIO_PIN(12, "gpio12", LEGACY_LED, ASYNC_MODEM, UTOPIA),79 BCM6358_GPIO_PIN(13, "gpio13", LEGACY_LED, ASYNC_MODEM, UTOPIA),80 BCM6358_GPIO_PIN(14, "gpio14", LEGACY_LED, ASYNC_MODEM, UTOPIA),81 BCM6358_GPIO_PIN(15, "gpio15", LEGACY_LED, ASYNC_MODEM, UTOPIA),82 PINCTRL_PIN(16, "gpio16"),83 PINCTRL_PIN(17, "gpio17"),84 PINCTRL_PIN(18, "gpio18"),85 PINCTRL_PIN(19, "gpio19"),86 PINCTRL_PIN(20, "gpio20"),87 PINCTRL_PIN(21, "gpio21"),88 BCM6358_GPIO_PIN(22, "gpio22", UTOPIA, NONE, NONE),89 BCM6358_GPIO_PIN(23, "gpio23", UTOPIA, NONE, NONE),90 BCM6358_GPIO_PIN(24, "gpio24", UTOPIA, NONE, NONE),91 BCM6358_GPIO_PIN(25, "gpio25", UTOPIA, NONE, NONE),92 BCM6358_GPIO_PIN(26, "gpio26", UTOPIA, NONE, NONE),93 BCM6358_GPIO_PIN(27, "gpio27", UTOPIA, NONE, NONE),94 BCM6358_GPIO_PIN(28, "gpio28", UTOPIA, UART1, NONE),95 BCM6358_GPIO_PIN(29, "gpio29", UTOPIA, UART1, NONE),96 BCM6358_GPIO_PIN(30, "gpio30", UTOPIA, UART1, EBI_CS),97 BCM6358_GPIO_PIN(31, "gpio31", UTOPIA, UART1, EBI_CS),98 BCM6358_GPIO_PIN(32, "gpio32", SPI_CS, NONE, NONE),99 BCM6358_GPIO_PIN(33, "gpio33", SPI_CS, NONE, NONE),100 PINCTRL_PIN(34, "gpio34"),101 PINCTRL_PIN(35, "gpio35"),102 PINCTRL_PIN(36, "gpio36"),103 PINCTRL_PIN(37, "gpio37"),104 PINCTRL_PIN(38, "gpio38"),105 PINCTRL_PIN(39, "gpio39"),106};107 108static unsigned ebi_cs_grp_pins[] = { 30, 31 };109 110static unsigned uart1_grp_pins[] = { 28, 29, 30, 31 };111 112static unsigned spi_cs_grp_pins[] = { 32, 33 };113 114static unsigned async_modem_grp_pins[] = { 12, 13, 14, 15 };115 116static unsigned serial_led_grp_pins[] = { 6, 7 };117 118static unsigned legacy_led_grp_pins[] = { 9, 10, 11, 12, 13, 14, 15 };119 120static unsigned led_grp_pins[] = { 0, 1, 2, 3 };121 122static unsigned utopia_grp_pins[] = {123 12, 13, 14, 15, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,124};125 126static unsigned pwm_syn_clk_grp_pins[] = { 8 };127 128static unsigned sys_irq_grp_pins[] = { 5 };129 130#define BCM6358_GPIO_MUX_GROUP(n, bit, dir) \131 { \132 .grp = BCM_PIN_GROUP(n), \133 .mode_val = BCM6358_MODE_MUX_##bit, \134 .direction = dir, \135 }136 137static const struct bcm6358_pingroup bcm6358_groups[] = {138 BCM6358_GPIO_MUX_GROUP(ebi_cs_grp, EBI_CS, 0x3),139 BCM6358_GPIO_MUX_GROUP(uart1_grp, UART1, 0x2),140 BCM6358_GPIO_MUX_GROUP(spi_cs_grp, SPI_CS, 0x6),141 BCM6358_GPIO_MUX_GROUP(async_modem_grp, ASYNC_MODEM, 0x6),142 BCM6358_GPIO_MUX_GROUP(legacy_led_grp, LEGACY_LED, 0x7f),143 BCM6358_GPIO_MUX_GROUP(serial_led_grp, SERIAL_LED, 0x3),144 BCM6358_GPIO_MUX_GROUP(led_grp, LED, 0xf),145 BCM6358_GPIO_MUX_GROUP(utopia_grp, UTOPIA, 0x000f),146 BCM6358_GPIO_MUX_GROUP(pwm_syn_clk_grp, PWM_SYN_CLK, 0x1),147 BCM6358_GPIO_MUX_GROUP(sys_irq_grp, SYS_IRQ, 0x1),148};149 150static const char * const ebi_cs_groups[] = {151 "ebi_cs_grp"152};153 154static const char * const uart1_groups[] = {155 "uart1_grp"156};157 158static const char * const spi_cs_2_3_groups[] = {159 "spi_cs_2_3_grp"160};161 162static const char * const async_modem_groups[] = {163 "async_modem_grp"164};165 166static const char * const legacy_led_groups[] = {167 "legacy_led_grp",168};169 170static const char * const serial_led_groups[] = {171 "serial_led_grp",172};173 174static const char * const led_groups[] = {175 "led_grp",176};177 178static const char * const clkrst_groups[] = {179 "clkrst_grp",180};181 182static const char * const pwm_syn_clk_groups[] = {183 "pwm_syn_clk_grp",184};185 186static const char * const sys_irq_groups[] = {187 "sys_irq_grp",188};189 190#define BCM6358_FUN(n) \191 { \192 .name = #n, \193 .groups = n##_groups, \194 .num_groups = ARRAY_SIZE(n##_groups), \195 }196 197static const struct bcm6358_function bcm6358_funcs[] = {198 BCM6358_FUN(ebi_cs),199 BCM6358_FUN(uart1),200 BCM6358_FUN(spi_cs_2_3),201 BCM6358_FUN(async_modem),202 BCM6358_FUN(legacy_led),203 BCM6358_FUN(serial_led),204 BCM6358_FUN(led),205 BCM6358_FUN(clkrst),206 BCM6358_FUN(pwm_syn_clk),207 BCM6358_FUN(sys_irq),208};209 210static int bcm6358_pinctrl_get_group_count(struct pinctrl_dev *pctldev)211{212 return ARRAY_SIZE(bcm6358_groups);213}214 215static const char *bcm6358_pinctrl_get_group_name(struct pinctrl_dev *pctldev,216 unsigned group)217{218 return bcm6358_groups[group].grp.name;219}220 221static int bcm6358_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,222 unsigned group, const unsigned **pins,223 unsigned *npins)224{225 *pins = bcm6358_groups[group].grp.pins;226 *npins = bcm6358_groups[group].grp.npins;227 228 return 0;229}230 231static int bcm6358_pinctrl_get_func_count(struct pinctrl_dev *pctldev)232{233 return ARRAY_SIZE(bcm6358_funcs);234}235 236static const char *bcm6358_pinctrl_get_func_name(struct pinctrl_dev *pctldev,237 unsigned selector)238{239 return bcm6358_funcs[selector].name;240}241 242static int bcm6358_pinctrl_get_groups(struct pinctrl_dev *pctldev,243 unsigned selector,244 const char * const **groups,245 unsigned * const num_groups)246{247 *groups = bcm6358_funcs[selector].groups;248 *num_groups = bcm6358_funcs[selector].num_groups;249 250 return 0;251}252 253static int bcm6358_pinctrl_set_mux(struct pinctrl_dev *pctldev,254 unsigned selector, unsigned group)255{256 struct bcm63xx_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);257 struct bcm6358_priv *priv = pc->driver_data;258 const struct bcm6358_pingroup *pg = &bcm6358_groups[group];259 unsigned int val = pg->mode_val;260 unsigned int mask = val;261 unsigned pin;262 263 for (pin = 0; pin < pg->grp.npins; pin++)264 mask |= (unsigned long)bcm6358_pins[pin].drv_data;265 266 regmap_field_update_bits(priv->overlays, mask, val);267 268 for (pin = 0; pin < pg->grp.npins; pin++) {269 struct pinctrl_gpio_range *range;270 unsigned int hw_gpio = bcm6358_pins[pin].number;271 272 range = pinctrl_find_gpio_range_from_pin(pctldev, hw_gpio);273 if (range) {274 struct gpio_chip *gc = range->gc;275 276 if (pg->direction & BIT(pin))277 gc->direction_output(gc, hw_gpio, 0);278 else279 gc->direction_input(gc, hw_gpio);280 }281 }282 283 return 0;284}285 286static int bcm6358_gpio_request_enable(struct pinctrl_dev *pctldev,287 struct pinctrl_gpio_range *range,288 unsigned offset)289{290 struct bcm63xx_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);291 struct bcm6358_priv *priv = pc->driver_data;292 unsigned int mask;293 294 mask = (unsigned long) bcm6358_pins[offset].drv_data;295 if (!mask)296 return 0;297 298 /* disable all functions using this pin */299 return regmap_field_update_bits(priv->overlays, mask, 0);300}301 302static const struct pinctrl_ops bcm6358_pctl_ops = {303 .dt_free_map = pinctrl_utils_free_map,304 .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,305 .get_group_name = bcm6358_pinctrl_get_group_name,306 .get_group_pins = bcm6358_pinctrl_get_group_pins,307 .get_groups_count = bcm6358_pinctrl_get_group_count,308};309 310static const struct pinmux_ops bcm6358_pmx_ops = {311 .get_function_groups = bcm6358_pinctrl_get_groups,312 .get_function_name = bcm6358_pinctrl_get_func_name,313 .get_functions_count = bcm6358_pinctrl_get_func_count,314 .gpio_request_enable = bcm6358_gpio_request_enable,315 .set_mux = bcm6358_pinctrl_set_mux,316 .strict = true,317};318 319static const struct bcm63xx_pinctrl_soc bcm6358_soc = {320 .ngpios = BCM6358_NUM_GPIOS,321 .npins = ARRAY_SIZE(bcm6358_pins),322 .pctl_ops = &bcm6358_pctl_ops,323 .pins = bcm6358_pins,324 .pmx_ops = &bcm6358_pmx_ops,325};326 327static int bcm6358_pinctrl_probe(struct platform_device *pdev)328{329 struct reg_field overlays = REG_FIELD(BCM6358_MODE_REG, 0, 15);330 struct device *dev = &pdev->dev;331 struct bcm63xx_pinctrl *pc;332 struct bcm6358_priv *priv;333 int err;334 335 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);336 if (!priv)337 return -ENOMEM;338 339 err = bcm63xx_pinctrl_probe(pdev, &bcm6358_soc, (void *) priv);340 if (err)341 return err;342 343 pc = platform_get_drvdata(pdev);344 345 priv->overlays = devm_regmap_field_alloc(dev, pc->regs, overlays);346 if (IS_ERR(priv->overlays))347 return PTR_ERR(priv->overlays);348 349 return 0;350}351 352static const struct of_device_id bcm6358_pinctrl_match[] = {353 { .compatible = "brcm,bcm6358-pinctrl", },354 { /* sentinel */ }355};356 357static struct platform_driver bcm6358_pinctrl_driver = {358 .probe = bcm6358_pinctrl_probe,359 .driver = {360 .name = "bcm6358-pinctrl",361 .of_match_table = bcm6358_pinctrl_match,362 },363};364 365builtin_platform_driver(bcm6358_pinctrl_driver);366