// SPDX-License-Identifier: GPL-2.0+ /* * Driver for BCM6358 GPIO unit (pinctrl + GPIO) * * Copyright (C) 2021 Álvaro Fernández Rojas * Copyright (C) 2016 Jonas Gorski */ #include #include #include #include #include #include #include #include "../pinctrl-utils.h" #include "pinctrl-bcm63xx.h" #define BCM6358_NUM_GPIOS 40 #define BCM6358_MODE_REG 0x18 #define BCM6358_MODE_MUX_NONE 0 #define BCM6358_MODE_MUX_EBI_CS BIT(5) #define BCM6358_MODE_MUX_UART1 BIT(6) #define BCM6358_MODE_MUX_SPI_CS BIT(7) #define BCM6358_MODE_MUX_ASYNC_MODEM BIT(8) #define BCM6358_MODE_MUX_LEGACY_LED BIT(9) #define BCM6358_MODE_MUX_SERIAL_LED BIT(10) #define BCM6358_MODE_MUX_LED BIT(11) #define BCM6358_MODE_MUX_UTOPIA BIT(12) #define BCM6358_MODE_MUX_CLKRST BIT(13) #define BCM6358_MODE_MUX_PWM_SYN_CLK BIT(14) #define BCM6358_MODE_MUX_SYS_IRQ BIT(15) struct bcm6358_pingroup { const char *name; const unsigned * const pins; const unsigned num_pins; const uint16_t mode_val; /* non-GPIO function muxes require the gpio direction to be set */ const uint16_t direction; }; struct bcm6358_function { const char *name; const char * const *groups; const unsigned num_groups; }; struct bcm6358_priv { struct regmap_field *overlays; }; #define BCM6358_GPIO_PIN(a, b, bit1, bit2, bit3) \ { \ .number = a, \ .name = b, \ .drv_data = (void *)(BCM6358_MODE_MUX_##bit1 | \ BCM6358_MODE_MUX_##bit2 | \ BCM6358_MODE_MUX_##bit3), \ } static const struct pinctrl_pin_desc bcm6358_pins[] = { BCM6358_GPIO_PIN(0, "gpio0", LED, NONE, NONE), BCM6358_GPIO_PIN(1, "gpio1", LED, NONE, NONE), BCM6358_GPIO_PIN(2, "gpio2", LED, NONE, NONE), BCM6358_GPIO_PIN(3, "gpio3", LED, NONE, NONE), PINCTRL_PIN(4, "gpio4"), BCM6358_GPIO_PIN(5, "gpio5", SYS_IRQ, NONE, NONE), BCM6358_GPIO_PIN(6, "gpio6", SERIAL_LED, NONE, NONE), BCM6358_GPIO_PIN(7, "gpio7", SERIAL_LED, NONE, NONE), BCM6358_GPIO_PIN(8, "gpio8", PWM_SYN_CLK, NONE, NONE), BCM6358_GPIO_PIN(9, "gpio09", LEGACY_LED, NONE, NONE), BCM6358_GPIO_PIN(10, "gpio10", LEGACY_LED, NONE, NONE), BCM6358_GPIO_PIN(11, "gpio11", LEGACY_LED, NONE, NONE), BCM6358_GPIO_PIN(12, "gpio12", LEGACY_LED, ASYNC_MODEM, UTOPIA), BCM6358_GPIO_PIN(13, "gpio13", LEGACY_LED, ASYNC_MODEM, UTOPIA), BCM6358_GPIO_PIN(14, "gpio14", LEGACY_LED, ASYNC_MODEM, UTOPIA), BCM6358_GPIO_PIN(15, "gpio15", LEGACY_LED, ASYNC_MODEM, UTOPIA), PINCTRL_PIN(16, "gpio16"), PINCTRL_PIN(17, "gpio17"), PINCTRL_PIN(18, "gpio18"), PINCTRL_PIN(19, "gpio19"), PINCTRL_PIN(20, "gpio20"), PINCTRL_PIN(21, "gpio21"), BCM6358_GPIO_PIN(22, "gpio22", UTOPIA, NONE, NONE), BCM6358_GPIO_PIN(23, "gpio23", UTOPIA, NONE, NONE), BCM6358_GPIO_PIN(24, "gpio24", UTOPIA, NONE, NONE), BCM6358_GPIO_PIN(25, "gpio25", UTOPIA, NONE, NONE), BCM6358_GPIO_PIN(26, "gpio26", UTOPIA, NONE, NONE), BCM6358_GPIO_PIN(27, "gpio27", UTOPIA, NONE, NONE), BCM6358_GPIO_PIN(28, "gpio28", UTOPIA, UART1, NONE), BCM6358_GPIO_PIN(29, "gpio29", UTOPIA, UART1, NONE), BCM6358_GPIO_PIN(30, "gpio30", UTOPIA, UART1, EBI_CS), BCM6358_GPIO_PIN(31, "gpio31", UTOPIA, UART1, EBI_CS), BCM6358_GPIO_PIN(32, "gpio32", SPI_CS, NONE, NONE), BCM6358_GPIO_PIN(33, "gpio33", SPI_CS, NONE, NONE), PINCTRL_PIN(34, "gpio34"), PINCTRL_PIN(35, "gpio35"), PINCTRL_PIN(36, "gpio36"), PINCTRL_PIN(37, "gpio37"), PINCTRL_PIN(38, "gpio38"), PINCTRL_PIN(39, "gpio39"), }; static unsigned ebi_cs_grp_pins[] = { 30, 31 }; static unsigned uart1_grp_pins[] = { 28, 29, 30, 31 }; static unsigned spi_cs_grp_pins[] = { 32, 33 }; static unsigned async_modem_grp_pins[] = { 12, 13, 14, 15 }; static unsigned serial_led_grp_pins[] = { 6, 7 }; static unsigned legacy_led_grp_pins[] = { 9, 10, 11, 12, 13, 14, 15 }; static unsigned led_grp_pins[] = { 0, 1, 2, 3 }; static unsigned utopia_grp_pins[] = { 12, 13, 14, 15, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, }; static unsigned pwm_syn_clk_grp_pins[] = { 8 }; static unsigned sys_irq_grp_pins[] = { 5 }; #define BCM6358_GPIO_MUX_GROUP(n, bit, dir) \ { \ .name = #n, \ .pins = n##_pins, \ .num_pins = ARRAY_SIZE(n##_pins), \ .mode_val = BCM6358_MODE_MUX_##bit, \ .direction = dir, \ } static const struct bcm6358_pingroup bcm6358_groups[] = { BCM6358_GPIO_MUX_GROUP(ebi_cs_grp, EBI_CS, 0x3), BCM6358_GPIO_MUX_GROUP(uart1_grp, UART1, 0x2), BCM6358_GPIO_MUX_GROUP(spi_cs_grp, SPI_CS, 0x6), BCM6358_GPIO_MUX_GROUP(async_modem_grp, ASYNC_MODEM, 0x6), BCM6358_GPIO_MUX_GROUP(legacy_led_grp, LEGACY_LED, 0x7f), BCM6358_GPIO_MUX_GROUP(serial_led_grp, SERIAL_LED, 0x3), BCM6358_GPIO_MUX_GROUP(led_grp, LED, 0xf), BCM6358_GPIO_MUX_GROUP(utopia_grp, UTOPIA, 0x000f), BCM6358_GPIO_MUX_GROUP(pwm_syn_clk_grp, PWM_SYN_CLK, 0x1), BCM6358_GPIO_MUX_GROUP(sys_irq_grp, SYS_IRQ, 0x1), }; static const char * const ebi_cs_groups[] = { "ebi_cs_grp" }; static const char * const uart1_groups[] = { "uart1_grp" }; static const char * const spi_cs_2_3_groups[] = { "spi_cs_2_3_grp" }; static const char * const async_modem_groups[] = { "async_modem_grp" }; static const char * const legacy_led_groups[] = { "legacy_led_grp", }; static const char * const serial_led_groups[] = { "serial_led_grp", }; static const char * const led_groups[] = { "led_grp", }; static const char * const clkrst_groups[] = { "clkrst_grp", }; static const char * const pwm_syn_clk_groups[] = { "pwm_syn_clk_grp", }; static const char * const sys_irq_groups[] = { "sys_irq_grp", }; #define BCM6358_FUN(n) \ { \ .name = #n, \ .groups = n##_groups, \ .num_groups = ARRAY_SIZE(n##_groups), \ } static const struct bcm6358_function bcm6358_funcs[] = { BCM6358_FUN(ebi_cs), BCM6358_FUN(uart1), BCM6358_FUN(spi_cs_2_3), BCM6358_FUN(async_modem), BCM6358_FUN(legacy_led), BCM6358_FUN(serial_led), BCM6358_FUN(led), BCM6358_FUN(clkrst), BCM6358_FUN(pwm_syn_clk), BCM6358_FUN(sys_irq), }; static int bcm6358_pinctrl_get_group_count(struct pinctrl_dev *pctldev) { return ARRAY_SIZE(bcm6358_groups); } static const char *bcm6358_pinctrl_get_group_name(struct pinctrl_dev *pctldev, unsigned group) { return bcm6358_groups[group].name; } static int bcm6358_pinctrl_get_group_pins(struct pinctrl_dev *pctldev, unsigned group, const unsigned **pins, unsigned *num_pins) { *pins = bcm6358_groups[group].pins; *num_pins = bcm6358_groups[group].num_pins; return 0; } static int bcm6358_pinctrl_get_func_count(struct pinctrl_dev *pctldev) { return ARRAY_SIZE(bcm6358_funcs); } static const char *bcm6358_pinctrl_get_func_name(struct pinctrl_dev *pctldev, unsigned selector) { return bcm6358_funcs[selector].name; } static int bcm6358_pinctrl_get_groups(struct pinctrl_dev *pctldev, unsigned selector, const char * const **groups, unsigned * const num_groups) { *groups = bcm6358_funcs[selector].groups; *num_groups = bcm6358_funcs[selector].num_groups; return 0; } static int bcm6358_pinctrl_set_mux(struct pinctrl_dev *pctldev, unsigned selector, unsigned group) { struct bcm63xx_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); struct bcm6358_priv *priv = pc->driver_data; const struct bcm6358_pingroup *pg = &bcm6358_groups[group]; unsigned int val = pg->mode_val; unsigned int mask = val; unsigned pin; for (pin = 0; pin < pg->num_pins; pin++) mask |= (unsigned long)bcm6358_pins[pin].drv_data; regmap_field_update_bits(priv->overlays, mask, val); for (pin = 0; pin < pg->num_pins; pin++) { struct pinctrl_gpio_range *range; unsigned int hw_gpio = bcm6358_pins[pin].number; range = pinctrl_find_gpio_range_from_pin(pctldev, hw_gpio); if (range) { struct gpio_chip *gc = range->gc; if (pg->direction & BIT(pin)) gc->direction_output(gc, hw_gpio, 0); else gc->direction_input(gc, hw_gpio); } } return 0; } static int bcm6358_gpio_request_enable(struct pinctrl_dev *pctldev, struct pinctrl_gpio_range *range, unsigned offset) { struct bcm63xx_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); struct bcm6358_priv *priv = pc->driver_data; unsigned int mask; mask = (unsigned long) bcm6358_pins[offset].drv_data; if (!mask) return 0; /* disable all functions using this pin */ return regmap_field_update_bits(priv->overlays, mask, 0); } static struct pinctrl_ops bcm6358_pctl_ops = { .dt_free_map = pinctrl_utils_free_map, .dt_node_to_map = pinconf_generic_dt_node_to_map_pin, .get_group_name = bcm6358_pinctrl_get_group_name, .get_group_pins = bcm6358_pinctrl_get_group_pins, .get_groups_count = bcm6358_pinctrl_get_group_count, }; static struct pinmux_ops bcm6358_pmx_ops = { .get_function_groups = bcm6358_pinctrl_get_groups, .get_function_name = bcm6358_pinctrl_get_func_name, .get_functions_count = bcm6358_pinctrl_get_func_count, .gpio_request_enable = bcm6358_gpio_request_enable, .set_mux = bcm6358_pinctrl_set_mux, .strict = true, }; static const struct bcm63xx_pinctrl_soc bcm6358_soc = { .ngpios = BCM6358_NUM_GPIOS, .npins = ARRAY_SIZE(bcm6358_pins), .pctl_ops = &bcm6358_pctl_ops, .pins = bcm6358_pins, .pmx_ops = &bcm6358_pmx_ops, }; static int bcm6358_pinctrl_probe(struct platform_device *pdev) { struct reg_field overlays = REG_FIELD(BCM6358_MODE_REG, 0, 15); struct device *dev = &pdev->dev; struct bcm63xx_pinctrl *pc; struct bcm6358_priv *priv; int err; priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; err = bcm63xx_pinctrl_probe(pdev, &bcm6358_soc, (void *) priv); if (err) return err; pc = platform_get_drvdata(pdev); priv->overlays = devm_regmap_field_alloc(dev, pc->regs, overlays); if (IS_ERR(priv->overlays)) return PTR_ERR(priv->overlays); return 0; } static const struct of_device_id bcm6358_pinctrl_match[] = { { .compatible = "brcm,bcm6358-pinctrl", }, { /* sentinel */ } }; static struct platform_driver bcm6358_pinctrl_driver = { .probe = bcm6358_pinctrl_probe, .driver = { .name = "bcm6358-pinctrl", .of_match_table = bcm6358_pinctrl_match, }, }; builtin_platform_driver(bcm6358_pinctrl_driver);