drivers/gpio/gpio_imx.c

/*
 * Copyright (c) 2018-2019, NXP
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#define DT_DRV_COMPAT nxp_imx_gpio

#include <errno.h>
#include <zephyr/device.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/irq.h>
#include <soc.h>
#include <zephyr/sys/util.h>
#include <gpio_imx.h>
#include <string.h>
#include <zephyr/drivers/pinctrl.h>

#include <zephyr/drivers/gpio/gpio_utils.h>

struct imx_gpio_config {
	/* gpio_driver_config needs to be first */
	struct gpio_driver_config common;
	GPIO_Type *base;
	const struct pinctrl_soc_pinmux *pin_muxes;
	uint8_t mux_count;
};

struct imx_gpio_data {
	/* gpio_driver_data needs to be first */
	struct gpio_driver_data common;
	/* port ISR callback routine address */
	sys_slist_t callbacks;
};

static int imx_gpio_configure(const struct device *port, gpio_pin_t pin,
			      gpio_flags_t flags)
{
	const struct imx_gpio_config *config = port->config;
	GPIO_Type *base = config->base;

	if (((flags & GPIO_INPUT) != 0U) && ((flags & GPIO_OUTPUT) != 0U)) {
		return -ENOTSUP;
	}
	__ASSERT_NO_MSG(pin < config->mux_count);

	struct pinctrl_soc_pin pin_cfg;
	/* Set appropriate bits in pin configuration register */
	volatile uint32_t *gpio_cfg_reg =
		(volatile uint32_t *)config->pin_muxes[pin].config_register;
	uint32_t reg = *gpio_cfg_reg;

#ifdef MCUX_IMX_DRIVE_OPEN_DRAIN_SHIFT
	if ((flags & GPIO_SINGLE_ENDED) != 0) {
		/* Set ODE bit */
		reg |= BIT(MCUX_IMX_DRIVE_OPEN_DRAIN_SHIFT);
	} else {
		reg &= ~BIT(MCUX_IMX_DRIVE_OPEN_DRAIN_SHIFT);
	}
#else
	if ((flags & GPIO_SINGLE_ENDED) != 0) {
		return -ENOTSUP;
	}
#endif
	if (((flags & GPIO_PULL_UP) != 0) || ((flags & GPIO_PULL_DOWN) != 0)) {
		reg |= BIT(MCUX_IMX_PULL_ENABLE_SHIFT);
#ifdef CONFIG_SOC_MCIMX6X_M4
		reg |= BIT(MCUX_IMX_BIAS_BUS_HOLD_SHIFT);
#endif
		if (((flags & GPIO_PULL_UP) != 0)) {
			reg |= BIT(MCUX_IMX_BIAS_PULL_UP_SHIFT);
		} else {
			reg &= ~BIT(MCUX_IMX_BIAS_PULL_UP_SHIFT);
		}
	} else {
		/* Set pin to highz */
		reg &= ~BIT(MCUX_IMX_PULL_ENABLE_SHIFT);
#ifdef CONFIG_SOC_MCIMX6X_M4
		reg &= ~BIT(MCUX_IMX_BIAS_BUS_HOLD_SHIFT);
#endif
	}

	/* Init pin configuration struct, and use pinctrl api to apply settings */
	__ASSERT_NO_MSG(pin < config->mux_count);

	memcpy(&pin_cfg.pinmux, &config->pin_muxes[pin], sizeof(pin_cfg.pinmux));

	unsigned int key = irq_lock();

	/* cfg register will be set by pinctrl_configure_pins */
	pin_cfg.pin_ctrl_flags = reg;
	pinctrl_configure_pins(&pin_cfg, 1, PINCTRL_REG_NONE);

	/* Disable interrupts for pin */
	GPIO_SetPinIntMode(base, pin, false);
	GPIO_SetIntEdgeSelect(base, pin, false);

	if ((flags & GPIO_OUTPUT) != 0U) {
		/* Set output pin initial value */
		if ((flags & GPIO_OUTPUT_INIT_LOW) != 0U) {
			GPIO_WritePinOutput(base, pin, gpioPinClear);
		} else if ((flags & GPIO_OUTPUT_INIT_HIGH) != 0U) {
			GPIO_WritePinOutput(base, pin, gpioPinSet);
		}

		/* Set pin as output */
		WRITE_BIT(base->GDIR, pin, 1U);
	} else {
		/* Set pin as input */
		WRITE_BIT(base->GDIR, pin, 0U);
	}

	irq_unlock(key);

	return 0;
}

static int imx_gpio_port_get_raw(const struct device *port, uint32_t *value)
{
	const struct imx_gpio_config *config = port->config;
	GPIO_Type *base = config->base;

	*value = GPIO_ReadPortInput(base);

	return 0;
}

static int imx_gpio_port_set_masked_raw(const struct device *port,
					gpio_port_pins_t mask,
					gpio_port_value_t value)
{
	const struct imx_gpio_config *config = port->config;
	GPIO_Type *base = config->base;

	unsigned int key = irq_lock();
	GPIO_WritePortOutput(base,
			(GPIO_ReadPortInput(base) & ~mask) | (value & mask));
	irq_unlock(key);

	return 0;
}

static int imx_gpio_port_set_bits_raw(const struct device *port,
				      gpio_port_pins_t pins)
{
	const struct imx_gpio_config *config = port->config;
	GPIO_Type *base = config->base;

	unsigned int key = irq_lock();
	GPIO_WritePortOutput(base, GPIO_ReadPortInput(base) | pins);
	irq_unlock(key);

	return 0;
}

static int imx_gpio_port_clear_bits_raw(const struct device *port,
					gpio_port_pins_t pins)
{
	const struct imx_gpio_config *config = port->config;
	GPIO_Type *base = config->base;

	unsigned int key = irq_lock();
	GPIO_WritePortOutput(base, GPIO_ReadPortInput(base) & ~pins);
	irq_unlock(key);

	return 0;
}

static int imx_gpio_port_toggle_bits(const struct device *port,
				     gpio_port_pins_t pins)
{
	const struct imx_gpio_config *config = port->config;
	GPIO_Type *base = config->base;

	unsigned int key = irq_lock();
	GPIO_WritePortOutput(base, GPIO_ReadPortInput(base) ^ pins);
	irq_unlock(key);

	return 0;
}

static int imx_gpio_pin_interrupt_configure(const struct device *port,
					    gpio_pin_t pin,
					    enum gpio_int_mode mode,
					    enum gpio_int_trig trig)
{
	const struct imx_gpio_config *config = port->config;
	GPIO_Type *base = config->base;
	volatile uint32_t *icr_reg;
	unsigned int key;
	uint32_t icr_val;
	uint8_t shift;

	if (((base->GDIR & BIT(pin)) != 0U)
	    && (mode != GPIO_INT_MODE_DISABLED)) {
		/* Interrupt on output pin not supported */
		return -ENOTSUP;
	}

	if ((mode == GPIO_INT_MODE_EDGE) && (trig == GPIO_INT_TRIG_LOW)) {
		icr_val = 3U;
	} else if ((mode == GPIO_INT_MODE_EDGE) &&
		   (trig == GPIO_INT_TRIG_HIGH)) {
		icr_val = 2U;
	} else if ((mode == GPIO_INT_MODE_LEVEL) &&
		   (trig == GPIO_INT_TRIG_HIGH)) {
		icr_val = 1U;
	} else {
		icr_val = 0U;
	}

	if (pin < 16U) {
		shift = 2U * pin;
		icr_reg = &(base->ICR1);
	} else if (pin < 32U) {
		shift = 2U * (pin - 16U);
		icr_reg = &(base->ICR2);
	} else {
		return -EINVAL;
	}

	key = irq_lock();

	*icr_reg = (*icr_reg & ~(3U << shift)) | (icr_val << shift);

	WRITE_BIT(base->EDGE_SEL, pin, trig == GPIO_INT_TRIG_BOTH);
	WRITE_BIT(base->ISR, pin, mode != GPIO_INT_MODE_DISABLED);
	WRITE_BIT(base->IMR, pin, mode != GPIO_INT_MODE_DISABLED);

	irq_unlock(key);

	return 0;
}

static int imx_gpio_manage_callback(const struct device *port,
				    struct gpio_callback *cb, bool set)
{
	struct imx_gpio_data *data = port->data;

	return gpio_manage_callback(&data->callbacks, cb, set);
}

static void imx_gpio_port_isr(const struct device *port)
{
	const struct imx_gpio_config *config = port->config;
	struct imx_gpio_data *data = port->data;
	uint32_t int_status;

	int_status = config->base->ISR & config->base->IMR;

	config->base->ISR = int_status;

	gpio_fire_callbacks(&data->callbacks, port, int_status);
}

static const struct gpio_driver_api imx_gpio_driver_api = {
	.pin_configure = imx_gpio_configure,
	.port_get_raw = imx_gpio_port_get_raw,
	.port_set_masked_raw = imx_gpio_port_set_masked_raw,
	.port_set_bits_raw = imx_gpio_port_set_bits_raw,
	.port_clear_bits_raw = imx_gpio_port_clear_bits_raw,
	.port_toggle_bits = imx_gpio_port_toggle_bits,
	.pin_interrupt_configure = imx_gpio_pin_interrupt_configure,
	.manage_callback = imx_gpio_manage_callback,
};

/* These macros will declare an array of pinctrl_soc_pinmux types */
#define PINMUX_INIT(node, prop, idx) MCUX_IMX_PINMUX(DT_PROP_BY_IDX(node, prop, idx)),
#define IMX_IGPIO_PIN_DECLARE(n)						\
	const struct pinctrl_soc_pinmux mcux_igpio_pinmux_##n[] = {		\
		DT_INST_FOREACH_PROP_ELEM(n, pinmux, PINMUX_INIT)	\
	};
#define IMX_IGPIO_PIN_INIT(n)							\
	.pin_muxes = mcux_igpio_pinmux_##n,					\
	.mux_count = DT_INST_PROP_LEN(n, pinmux),

#define GPIO_IMX_INIT(n)						\
	IMX_IGPIO_PIN_DECLARE(n)					\
	static int imx_gpio_##n##_init(const struct device *port);	\
									\
	static const struct imx_gpio_config imx_gpio_##n##_config = {	\
		.common = {						\
			.port_pin_mask =				\
				GPIO_PORT_PIN_MASK_FROM_DT_INST(n),	\
		},							\
		.base = (GPIO_Type *)DT_INST_REG_ADDR(n),		\
		IMX_IGPIO_PIN_INIT(n)					\
	};								\
									\
	static struct imx_gpio_data imx_gpio_##n##_data;		\
									\
	DEVICE_DT_INST_DEFINE(n,					\
			    imx_gpio_##n##_init,			\
			    NULL,					\
			    &imx_gpio_##n##_data,			\
			    &imx_gpio_##n##_config,			\
			    PRE_KERNEL_1,				\
			    CONFIG_GPIO_INIT_PRIORITY,			\
			    &imx_gpio_driver_api);			\
									\
	static int imx_gpio_##n##_init(const struct device *port)	\
	{								\
		IRQ_CONNECT(DT_INST_IRQ_BY_IDX(n, 0, irq),		\
			    DT_INST_IRQ_BY_IDX(n, 0, priority),		\
			    imx_gpio_port_isr,				\
			    DEVICE_DT_INST_GET(n), 0);			\
									\
		irq_enable(DT_INST_IRQ_BY_IDX(n, 0, irq));		\
									\
		IRQ_CONNECT(DT_INST_IRQ_BY_IDX(n, 1, irq),		\
			    DT_INST_IRQ_BY_IDX(n, 1, priority),		\
			    imx_gpio_port_isr,				\
			    DEVICE_DT_INST_GET(n), 0);			\
									\
		irq_enable(DT_INST_IRQ_BY_IDX(n, 1, irq));		\
									\
		return 0;						\
	}

DT_INST_FOREACH_STATUS_OKAY(GPIO_IMX_INIT)