drivers/pinctrl/pinctrl_stm32.c

/*
 * Copyright (c) 2016 Open-RnD Sp. z o.o.
 * Copyright (c) 2021 Linaro Limited
 * Copyright (c) 2021 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <drivers/clock_control/stm32_clock_control.h>
#include <drivers/pinctrl.h>
#include <gpio/gpio_stm32.h>

#include <stm32_ll_bus.h>
#include <stm32_ll_gpio.h>
#include <stm32_ll_system.h>

/**
 * @brief Array containing pointers to each GPIO port.
 *
 * Entries will be NULL if the GPIO port is not enabled.
 */
static const struct device * const gpio_ports[] = {
	DEVICE_DT_GET_OR_NULL(DT_NODELABEL(gpioa)),
	DEVICE_DT_GET_OR_NULL(DT_NODELABEL(gpiob)),
	DEVICE_DT_GET_OR_NULL(DT_NODELABEL(gpioc)),
	DEVICE_DT_GET_OR_NULL(DT_NODELABEL(gpiod)),
	DEVICE_DT_GET_OR_NULL(DT_NODELABEL(gpioe)),
	DEVICE_DT_GET_OR_NULL(DT_NODELABEL(gpiof)),
	DEVICE_DT_GET_OR_NULL(DT_NODELABEL(gpiog)),
	DEVICE_DT_GET_OR_NULL(DT_NODELABEL(gpioh)),
	DEVICE_DT_GET_OR_NULL(DT_NODELABEL(gpioi)),
	DEVICE_DT_GET_OR_NULL(DT_NODELABEL(gpioj)),
	DEVICE_DT_GET_OR_NULL(DT_NODELABEL(gpiok)),
};

/** Number of GPIO ports. */
static const size_t gpio_ports_cnt = ARRAY_SIZE(gpio_ports);

#if DT_NODE_HAS_PROP(DT_NODELABEL(pinctrl), remap_pa11)
#define REMAP_PA11	DT_PROP(DT_NODELABEL(pinctrl), remap_pa11)
#endif
#if DT_NODE_HAS_PROP(DT_NODELABEL(pinctrl), remap_pa12)
#define REMAP_PA12	DT_PROP(DT_NODELABEL(pinctrl), remap_pa12)
#endif
#if DT_NODE_HAS_PROP(DT_NODELABEL(pinctrl), remap_pa11_pa12)
#define REMAP_PA11_PA12	DT_PROP(DT_NODELABEL(pinctrl), remap_pa11_pa12)
#endif

#if REMAP_PA11 || REMAP_PA12 || REMAP_PA11_PA12

int stm32_pinmux_init_remap(const struct device *dev)
{
	ARG_UNUSED(dev);

#if REMAP_PA11 || REMAP_PA12

#if !defined(CONFIG_SOC_SERIES_STM32G0X)
#error "Pin remap property available only on STM32G0 SoC series"
#endif

	LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_SYSCFG);
#if REMAP_PA11
	LL_SYSCFG_EnablePinRemap(LL_SYSCFG_PIN_RMP_PA11);
#endif
#if REMAP_PA12
	LL_SYSCFG_EnablePinRemap(LL_SYSCFG_PIN_RMP_PA12);
#endif

#elif REMAP_PA11_PA12

#if !defined(SYSCFG_CFGR1_PA11_PA12_RMP)
#error "Pin remap property available only on STM32F070x SoC series"
#endif

	LL_APB1_GRP2_EnableClock(LL_APB1_GRP2_PERIPH_SYSCFG);
	LL_SYSCFG_EnablePinRemap();

#endif /* (REMAP_PA11 || REMAP_PA12) || REMAP_PA11_PA12 */

	return 0;
}

SYS_INIT(stm32_pinmux_init_remap, PRE_KERNEL_1,
	 CONFIG_PINCTRL_STM32_REMAP_INIT_PRIORITY);

#endif /* REMAP_PA11 || REMAP_PA12 || REMAP_PA11_PA12 */

#if DT_HAS_COMPAT_STATUS_OKAY(st_stm32f1_pinctrl)

/**
 * @brief Helper function to check and apply provided pinctrl remap
 * configuration.
 *
 * Check operation verifies that pin remapping configuration is the same on all
 * pins. If configuration is valid AFIO clock is enabled and remap is applied
 *
 * @param pins List of pins to be configured.
 * @param pin_cnt Number of pins.
 *
 * @retval 0 If successful
 * @retval -EINVAL If pins have an incompatible set of remaps.
 */
static int stm32_pins_remap(const pinctrl_soc_pin_t *pins, uint8_t pin_cnt)
{
	uint8_t pos;
	uint32_t reg_val;
	volatile uint32_t *reg;
	uint16_t remap;

	remap = (uint16_t)STM32_DT_PINMUX_REMAP(pins[0].pinmux);

	/* not remappable */
	if (remap == NO_REMAP) {
		return 0;
	}

	for (size_t i = 1U; i < pin_cnt; i++) {
		if (STM32_DT_PINMUX_REMAP(pins[i].pinmux) != remap) {
			return -EINVAL;
		}
	}

	/* A valid remapping configuration is available */
	/* Apply remapping before proceeding with pin configuration */
	LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_AFIO);

	if (STM32_REMAP_REG_GET(remap) == 0U) {
		reg = &AFIO->MAPR;
	} else {
		reg = &AFIO->MAPR2;
	}

	pos = STM32_REMAP_SHIFT_GET(remap);

	reg_val = *reg;
	reg_val &= ~(STM32_REMAP_MASK_GET(remap) << pos);
	reg_val |= STM32_REMAP_VAL_GET(remap) << pos;
	*reg = reg_val;

	return 0;
}

#endif /* DT_HAS_COMPAT_STATUS_OKAY(st_stm32f1_pinctrl) */

static int stm32_pin_configure(uint32_t pin, uint32_t func, uint32_t altf)
{
	const struct device *port_device;

	if (STM32_PORT(pin) >= gpio_ports_cnt) {
		return -EINVAL;
	}

	port_device = gpio_ports[STM32_PORT(pin)];

	if ((port_device == NULL) || (!device_is_ready(port_device))) {
		return -ENODEV;
	}

	return gpio_stm32_configure(port_device, STM32_PIN(pin), func, altf);
}

int pinctrl_configure_pins(const pinctrl_soc_pin_t *pins, uint8_t pin_cnt,
			   uintptr_t reg)
{
	uint32_t pin, mux;
	uint32_t func = 0;
	int ret = 0;

	ARG_UNUSED(reg);

#if DT_HAS_COMPAT_STATUS_OKAY(st_stm32f1_pinctrl)
	ret = stm32_pins_remap(pins, pin_cnt);
	if (ret < 0) {
		return ret;
	}
#endif /* DT_HAS_COMPAT_STATUS_OKAY(st_stm32f1_pinctrl) */

	for (uint8_t i = 0U; i < pin_cnt; i++) {
		mux = pins[i].pinmux;

#if DT_HAS_COMPAT_STATUS_OKAY(st_stm32f1_pinctrl)
		uint32_t pupd;

		if (STM32_DT_PINMUX_FUNC(mux) == ALTERNATE) {
			func = pins[i].pincfg | STM32_MODE_OUTPUT | STM32_CNF_ALT_FUNC;
		} else if (STM32_DT_PINMUX_FUNC(mux) == ANALOG) {
			func = pins[i].pincfg | STM32_MODE_INPUT | STM32_CNF_IN_ANALOG;
		} else if (STM32_DT_PINMUX_FUNC(mux) == GPIO_IN) {
			func = pins[i].pincfg | STM32_MODE_INPUT;
			pupd = func & (STM32_PUPD_MASK << STM32_PUPD_SHIFT);
			if (pupd == STM32_PUPD_NO_PULL) {
				func = func | STM32_CNF_IN_FLOAT;
			} else {
				func = func | STM32_CNF_IN_PUPD;
			}
		} else {
			/* Not supported */
			__ASSERT_NO_MSG(STM32_DT_PINMUX_FUNC(mux));
		}
#else
		if (STM32_DT_PINMUX_FUNC(mux) < STM32_ANALOG) {
			func = pins[i].pincfg | STM32_MODER_ALT_MODE;
		} else if (STM32_DT_PINMUX_FUNC(mux) == STM32_ANALOG) {
			func = STM32_MODER_ANALOG_MODE;
		} else {
			/* Not supported */
			__ASSERT_NO_MSG(STM32_DT_PINMUX_FUNC(mux));
		}
#endif /* DT_HAS_COMPAT_STATUS_OKAY(st_stm32f1_pinctrl) */

		pin = STM32PIN(STM32_DT_PINMUX_PORT(mux),
			       STM32_DT_PINMUX_LINE(mux));

		ret = stm32_pin_configure(pin, func, STM32_DT_PINMUX_FUNC(mux));
		if (ret < 0) {
			return ret;
		}
	}

	return 0;
}