drivers/gpio/gpio_rv32m1.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2016 Freescale Semiconductor, Inc.
  * Copyright (c) 2017, NXP
  * Copyright (c) 2018 Foundries.io
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #include <errno.h>
 #include <device.h>
 #include <drivers/gpio.h>
 #include <soc.h>
 #include <fsl_common.h>
 #include <fsl_port.h>
 #include <drivers/clock_control.h>

 #include "gpio_utils.h"

 struct gpio_rv32m1_config {
 	GPIO_Type *gpio_base;
 	PORT_Type *port_base;
 	unsigned int flags;
 	char *clock_controller;
 	clock_control_subsys_t clock_subsys;
 	int (*irq_config_func)(struct device *dev);
 };

 struct gpio_rv32m1_data {
 	/* port ISR callback routine address */
 	sys_slist_t callbacks;
 	/* pin callback routine enable flags, by pin number */
 	u32_t pin_callback_enables;
 };

 static int gpio_rv32m1_configure(struct device *dev,
 				 int access_op, u32_t pin, int flags)
 {
 	const struct gpio_rv32m1_config *config = dev->config->config_info;
 	GPIO_Type *gpio_base = config->gpio_base;
 	PORT_Type *port_base = config->port_base;
 	port_interrupt_t port_interrupt = 0;
 	u32_t mask = 0U;
 	u32_t pcr = 0U;
 	u8_t i;

 	/* Check for an invalid pin configuration */
 	if ((flags & GPIO_INT) && (flags & GPIO_DIR_OUT)) {
 		return -EINVAL;
 	}

 	/* Check if GPIO port supports interrupts */
 	if ((flags & GPIO_INT) && ((config->flags & GPIO_INT) == 0U)) {
 		return -EINVAL;
 	}

 	/* The flags contain options that require touching registers in the
 	 * GPIO module and the corresponding PORT module.
 	 *
 	 * Start with the GPIO module and set up the pin direction register.
 	 * 0 - pin is input, 1 - pin is output
 	 */

 	if (access_op == GPIO_ACCESS_BY_PIN) {
 		if ((flags & GPIO_DIR_MASK) == GPIO_DIR_IN) {
 			gpio_base->PDDR &= ~BIT(pin);
 		} else {  /* GPIO_DIR_OUT */
 			gpio_base->PDDR |= BIT(pin);
 		}
 	} else {	/* GPIO_ACCESS_BY_PORT */
 		if ((flags & GPIO_DIR_MASK) == GPIO_DIR_IN) {
 			gpio_base->PDDR = 0x0;
 		} else {  /* GPIO_DIR_OUT */
 			gpio_base->PDDR = 0xFFFFFFFF;
 		}
 	}

 	/* Now do the PORT module. Figure out the pullup/pulldown
 	 * configuration, but don't write it to the PCR register yet.
 	 */
 	mask |= PORT_PCR_PE_MASK | PORT_PCR_PS_MASK;

 	if ((flags & GPIO_PUD_MASK) == GPIO_PUD_PULL_UP) {
 		/* Enable the pull and select the pullup resistor. */
 		pcr |= PORT_PCR_PE_MASK | PORT_PCR_PS_MASK;

 	} else if ((flags & GPIO_PUD_MASK) == GPIO_PUD_PULL_DOWN) {
 		/* Enable the pull and select the pulldown resistor (deselect
 		 * the pullup resistor.
 		 */
 		pcr |= PORT_PCR_PE_MASK;
 	}

 	/* Still in the PORT module. Figure out the interrupt configuration,
 	 * but don't write it to the PCR register yet.
 	 */
 	mask |= PORT_PCR_IRQC_MASK;

 	if (flags & GPIO_INT) {
 		if (flags & GPIO_INT_EDGE) {
 			if (flags & GPIO_INT_ACTIVE_HIGH) {
 				port_interrupt = kPORT_InterruptRisingEdge;
 			} else if (flags & GPIO_INT_DOUBLE_EDGE) {
 				port_interrupt = kPORT_InterruptEitherEdge;
 			} else {
 				port_interrupt = kPORT_InterruptFallingEdge;
 			}
 		} else { /* GPIO_INT_LEVEL */
 			if (flags & GPIO_INT_ACTIVE_HIGH) {
 				port_interrupt = kPORT_InterruptLogicOne;
 			} else {
 				port_interrupt = kPORT_InterruptLogicZero;
 			}
 		}
 		pcr |= PORT_PCR_IRQC(port_interrupt);
 	}

 	mask |= PORT_PCR_MUX_MASK;

 	/* Now we can write the PORT PCR register(s). If accessing by pin, we
 	 * only need to write one PCR register. Otherwise, write all the PCR
 	 * registers in the PORT module (one for each pin).
 	 */
 	if (access_op == GPIO_ACCESS_BY_PIN) {
 		port_base->PCR[pin] = (port_base->PCR[pin] & ~mask) | pcr |
 				      PORT_PCR_MUX(kPORT_MuxAsGpio);
 	} else {  /* GPIO_ACCESS_BY_PORT */
 		for (i = 0U; i < ARRAY_SIZE(port_base->PCR); i++) {
 			port_base->PCR[i] = (port_base->PCR[pin] & ~mask) | pcr
 					     | PORT_PCR_MUX(kPORT_MuxAsGpio);
 		}
 	}

 	return 0;
 }

 static int gpio_rv32m1_write(struct device *dev,
 			   int access_op, u32_t pin, u32_t value)
 {
 	const struct gpio_rv32m1_config *config = dev->config->config_info;
 	GPIO_Type *gpio_base = config->gpio_base;

 	if (access_op == GPIO_ACCESS_BY_PIN) {
 		if (value) {
 			/* Set the data output for the corresponding pin.
 			 * Writing zeros to the other bits leaves the data
 			 * output unchanged for the other pins.
 			 */
 			gpio_base->PSOR = BIT(pin);
 		} else {
 			/* Clear the data output for the corresponding pin.
 			 * Writing zeros to the other bits leaves the data
 			 * output unchanged for the other pins.
 			 */
 			gpio_base->PCOR = BIT(pin);
 		}
 	} else { /* GPIO_ACCESS_BY_PORT */
 		/* Write the data output for all the pins */
 		gpio_base->PDOR = value;
 	}

 	return 0;
 }

 static int gpio_rv32m1_read(struct device *dev,
 			  int access_op, u32_t pin, u32_t *value)
 {
 	const struct gpio_rv32m1_config *config = dev->config->config_info;
 	GPIO_Type *gpio_base = config->gpio_base;

 	*value = gpio_base->PDIR;

 	if (access_op == GPIO_ACCESS_BY_PIN) {
 		*value = (*value & BIT(pin)) >> pin;
 	}

 	/* nothing more to do for GPIO_ACCESS_BY_PORT */

 	return 0;
 }

 static int gpio_rv32m1_manage_callback(struct device *dev,
 				     struct gpio_callback *callback, bool set)
 {
 	struct gpio_rv32m1_data *data = dev->driver_data;

 	gpio_manage_callback(&data->callbacks, callback, set);

 	return 0;
 }

 static int gpio_rv32m1_enable_callback(struct device *dev,
 				     int access_op, u32_t pin)
 {
 	struct gpio_rv32m1_data *data = dev->driver_data;

 	if (access_op == GPIO_ACCESS_BY_PIN) {
 		data->pin_callback_enables |= BIT(pin);
 	} else {
 		data->pin_callback_enables = 0xFFFFFFFF;
 	}

 	return 0;
 }

 static int gpio_rv32m1_disable_callback(struct device *dev,
 				      int access_op, u32_t pin)
 {
 	struct gpio_rv32m1_data *data = dev->driver_data;

 	if (access_op == GPIO_ACCESS_BY_PIN) {
 		data->pin_callback_enables &= ~BIT(pin);
 	} else {
 		data->pin_callback_enables = 0U;
 	}

 	return 0;
 }

 static void gpio_rv32m1_port_isr(void *arg)
 {
 	struct device *dev = (struct device *)arg;
 	const struct gpio_rv32m1_config *config = dev->config->config_info;
 	struct gpio_rv32m1_data *data = dev->driver_data;
 	u32_t enabled_int, int_status;

 	int_status = config->port_base->ISFR;
 	enabled_int = int_status & data->pin_callback_enables;

 	gpio_fire_callbacks(&data->callbacks, dev, enabled_int);

 	/* Clear the port interrupts */
 	config->port_base->ISFR = 0xFFFFFFFF;
 }

 static int gpio_rv32m1_init(struct device *dev)
 {
 	const struct gpio_rv32m1_config *config = dev->config->config_info;
 	struct device *clk;
 	int ret;

 	if (config->clock_controller) {
 		clk = device_get_binding(config->clock_controller);
 		if (!clk) {
 			return -ENODEV;
 		}

 		ret = clock_control_on(clk, config->clock_subsys);

 		if (ret < 0) {
 			return ret;
 		}
 	}

 	return config->irq_config_func(dev);
 }

 static const struct gpio_driver_api gpio_rv32m1_driver_api = {
 	.config = gpio_rv32m1_configure,
 	.write = gpio_rv32m1_write,
 	.read = gpio_rv32m1_read,
 	.manage_callback = gpio_rv32m1_manage_callback,
 	.enable_callback = gpio_rv32m1_enable_callback,
 	.disable_callback = gpio_rv32m1_disable_callback,
 };

 #ifdef CONFIG_GPIO_RV32M1_PORTA
 static int gpio_rv32m1_porta_init(struct device *dev);

 static const struct gpio_rv32m1_config gpio_rv32m1_porta_config = {
 	.gpio_base = (GPIO_Type *) DT_OPENISA_RV32M1_GPIO_GPIO_A_BASE_ADDRESS,
 	.port_base = PORTA,
 #ifdef DT_OPENISA_RV32M1_GPIO_GPIO_A_IRQ_0
 	.flags = GPIO_INT,
 #else
 	.flags = 0,
 #endif
 	.irq_config_func = gpio_rv32m1_porta_init,
 #ifdef DT_OPENISA_RV32M1_GPIO_GPIO_A_CLOCK_CONTROLLER
 	.clock_controller = DT_OPENISA_RV32M1_GPIO_GPIO_A_CLOCK_CONTROLLER,
 	.clock_subsys = (clock_control_subsys_t)
 			DT_OPENISA_RV32M1_GPIO_GPIO_A_CLOCK_NAME,
 #else
 	.clock_controller = NULL,
 #endif
 };

 static struct gpio_rv32m1_data gpio_rv32m1_porta_data;

 DEVICE_AND_API_INIT(gpio_rv32m1_porta, DT_OPENISA_RV32M1_GPIO_GPIO_A_LABEL,
 		    gpio_rv32m1_init,
 		    &gpio_rv32m1_porta_data, &gpio_rv32m1_porta_config,
 		    POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
 		    &gpio_rv32m1_driver_api);

 static int gpio_rv32m1_porta_init(struct device *dev)
 {
 #ifdef DT_OPENISA_RV32M1_GPIO_GPIO_A_IRQ_0
 	IRQ_CONNECT(DT_OPENISA_RV32M1_GPIO_GPIO_A_IRQ_0,
 		    0,
 		    gpio_rv32m1_port_isr, DEVICE_GET(gpio_rv32m1_porta), 0);

 	irq_enable(DT_OPENISA_RV32M1_GPIO_GPIO_A_IRQ_0);

 	return 0;
 #else
 	return -1;
 #endif
 }
 #endif /* CONFIG_GPIO_RV32M1_PORTA */

 #ifdef CONFIG_GPIO_RV32M1_PORTB
 static int gpio_rv32m1_portb_init(struct device *dev);

 static const struct gpio_rv32m1_config gpio_rv32m1_portb_config = {
 	.gpio_base = (GPIO_Type *) DT_OPENISA_RV32M1_GPIO_GPIO_B_BASE_ADDRESS,
 	.port_base = PORTB,
 #ifdef DT_OPENISA_RV32M1_GPIO_GPIO_B_IRQ_0
 	.flags = GPIO_INT,
 #else
 	.flags = 0,
 #endif
 	.irq_config_func = gpio_rv32m1_portb_init,
 #ifdef DT_OPENISA_RV32M1_GPIO_GPIO_B_CLOCK_CONTROLLER
 	.clock_controller = DT_OPENISA_RV32M1_GPIO_GPIO_B_CLOCK_CONTROLLER,
 	.clock_subsys = (clock_control_subsys_t)
 			DT_OPENISA_RV32M1_GPIO_GPIO_B_CLOCK_NAME,
 #else
 	.clock_controller = NULL,
 #endif
 };

 static struct gpio_rv32m1_data gpio_rv32m1_portb_data;

 DEVICE_AND_API_INIT(gpio_rv32m1_portb, DT_OPENISA_RV32M1_GPIO_GPIO_B_LABEL,
 		    gpio_rv32m1_init,
 		    &gpio_rv32m1_portb_data, &gpio_rv32m1_portb_config,
 		    POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
 		    &gpio_rv32m1_driver_api);

 static int gpio_rv32m1_portb_init(struct device *dev)
 {
 #ifdef DT_OPENISA_RV32M1_GPIO_GPIO_B_IRQ_0
 	IRQ_CONNECT(DT_OPENISA_RV32M1_GPIO_GPIO_B_IRQ_0,
 		    0,
 		    gpio_rv32m1_port_isr, DEVICE_GET(gpio_rv32m1_portb), 0);

 	irq_enable(DT_OPENISA_RV32M1_GPIO_GPIO_B_IRQ_0);

 	return 0;
 #else
 	return -1;
 #endif
 }
 #endif /* CONFIG_GPIO_RV32M1_PORTB */

 #ifdef CONFIG_GPIO_RV32M1_PORTC
 static int gpio_rv32m1_portc_init(struct device *dev);

 static const struct gpio_rv32m1_config gpio_rv32m1_portc_config = {
 	.gpio_base = (GPIO_Type *) DT_OPENISA_RV32M1_GPIO_GPIO_C_BASE_ADDRESS,
 	.port_base = PORTC,
 #ifdef DT_OPENISA_RV32M1_GPIO_GPIO_C_IRQ_0
 	.flags = GPIO_INT,
 #else
 	.flags = 0,
 #endif
 	.irq_config_func = gpio_rv32m1_portc_init,
 #ifdef DT_OPENISA_RV32M1_GPIO_GPIO_C_CLOCK_CONTROLLER
 	.clock_controller = DT_OPENISA_RV32M1_GPIO_GPIO_C_CLOCK_CONTROLLER,
 	.clock_subsys = (clock_control_subsys_t)
 			DT_OPENISA_RV32M1_GPIO_GPIO_C_CLOCK_NAME,
 #else
 	.clock_controller = NULL,
 #endif

 };

 static struct gpio_rv32m1_data gpio_rv32m1_portc_data;

 DEVICE_AND_API_INIT(gpio_rv32m1_portc, DT_OPENISA_RV32M1_GPIO_GPIO_C_LABEL,
 		    gpio_rv32m1_init,
 		    &gpio_rv32m1_portc_data, &gpio_rv32m1_portc_config,
 		    POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
 		    &gpio_rv32m1_driver_api);

 static int gpio_rv32m1_portc_init(struct device *dev)
 {
 #ifdef DT_OPENISA_RV32M1_GPIO_GPIO_C_IRQ_0
 	IRQ_CONNECT(DT_OPENISA_RV32M1_GPIO_GPIO_C_IRQ_0,
 		    0,
 		    gpio_rv32m1_port_isr, DEVICE_GET(gpio_rv32m1_portc), 0);

 	irq_enable(DT_OPENISA_RV32M1_GPIO_GPIO_C_IRQ_0);

 	return 0;
 #else
 	return -1;
 #endif
 }
 #endif /* CONFIG_GPIO_RV32M1_PORTC */

 #ifdef CONFIG_GPIO_RV32M1_PORTD
 static int gpio_rv32m1_portd_init(struct device *dev);

 static const struct gpio_rv32m1_config gpio_rv32m1_portd_config = {
 	.gpio_base = (GPIO_Type *) DT_OPENISA_RV32M1_GPIO_GPIO_D_BASE_ADDRESS,
 	.port_base = PORTD,
 #ifdef DT_OPENISA_RV32M1_GPIO_GPIO_D_IRQ_0
 	.flags = GPIO_INT,
 #else
 	.flags = 0,
 #endif
 	.irq_config_func = gpio_rv32m1_portd_init,
 #ifdef DT_OPENISA_RV32M1_GPIO_GPIO_D_CLOCK_CONTROLLER
 	.clock_controller = DT_OPENISA_RV32M1_GPIO_GPIO_D_CLOCK_CONTROLLER,
 	.clock_subsys = (clock_control_subsys_t)
 			DT_OPENISA_RV32M1_GPIO_GPIO_D_CLOCK_NAME,
 #else
 	.clock_controller = NULL,
 #endif
 };

 static struct gpio_rv32m1_data gpio_rv32m1_portd_data;

 DEVICE_AND_API_INIT(gpio_rv32m1_portd, DT_OPENISA_RV32M1_GPIO_GPIO_D_LABEL,
 		    gpio_rv32m1_init,
 		    &gpio_rv32m1_portd_data, &gpio_rv32m1_portd_config,
 		    POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
 		    &gpio_rv32m1_driver_api);

 static int gpio_rv32m1_portd_init(struct device *dev)
 {
 #ifdef DT_OPENISA_RV32M1_GPIO_GPIO_D_IRQ_0
 	IRQ_CONNECT(DT_OPENISA_RV32M1_GPIO_GPIO_D_IRQ_0,
 		    0,
 		    gpio_rv32m1_port_isr, DEVICE_GET(gpio_rv32m1_portd), 0);

 	irq_enable(DT_OPENISA_RV32M1_GPIO_GPIO_D_IRQ_0);

 	return 0;
 #else
 	return -1;
 #endif
 }
 #endif /* CONFIG_GPIO_RV32M1_PORTD */

 #ifdef CONFIG_GPIO_RV32M1_PORTE
 static int gpio_rv32m1_porte_init(struct device *dev);

 static const struct gpio_rv32m1_config gpio_rv32m1_porte_config = {
 	.gpio_base = (GPIO_Type *) DT_OPENISA_RV32M1_GPIO_GPIO_E_BASE_ADDRESS,
 	.port_base = PORTE,
 #ifdef DT_OPENISA_RV32M1_GPIO_GPIO_E_IRQ_0
 	.flags = GPIO_INT,
 #else
 	.flags = 0,
 #endif
 	.irq_config_func = gpio_rv32m1_porte_init,
 #ifdef DT_OPENISA_RV32M1_GPIO_GPIO_E_CLOCK_CONTROLLER
 	.clock_controller = DT_OPENISA_RV32M1_GPIO_GPIO_E_CLOCK_CONTROLLER,
 	.clock_subsys = (clock_control_subsys_t)
 			DT_OPENISA_RV32M1_GPIO_GPIO_E_CLOCK_NAME,
 #else
 	.clock_controller = NULL,
 #endif
 };

 static struct gpio_rv32m1_data gpio_rv32m1_porte_data;

 DEVICE_AND_API_INIT(gpio_rv32m1_porte, DT_OPENISA_RV32M1_GPIO_GPIO_E_LABEL,
 		    gpio_rv32m1_init,
 		    &gpio_rv32m1_porte_data, &gpio_rv32m1_porte_config,
 		    POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
 		    &gpio_rv32m1_driver_api);

 static int gpio_rv32m1_porte_init(struct device *dev)
 {
 #ifdef DT_OPENISA_RV32M1_GPIO_GPIO_E_IRQ_0
 	IRQ_CONNECT(DT_OPENISA_RV32M1_GPIO_GPIO_E_IRQ_0,
 		    0,
 		    gpio_rv32m1_port_isr, DEVICE_GET(gpio_rv32m1_porte), 0);

 	irq_enable(DT_OPENISA_RV32M1_GPIO_GPIO_E_IRQ_0);

 	return 0;
 #else
 	return -1;
 #endif
 }
 #endif /* CONFIG_GPIO_RV32M1_PORTE */
	/*
	* Copyright (c) 2016 Freescale Semiconductor, Inc.
	* Copyright (c) 2017, NXP
	* Copyright (c) 2018 Foundries.io
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#include <errno.h>
	#include <device.h>
	#include <drivers/gpio.h>
	#include <soc.h>
	#include <fsl_common.h>
	#include <fsl_port.h>
	#include <drivers/clock_control.h>

	#include "gpio_utils.h"

	struct gpio_rv32m1_config {
	GPIO_Type *gpio_base;
	PORT_Type *port_base;
	unsigned int flags;
	char *clock_controller;
	clock_control_subsys_t clock_subsys;
	int (irq_config_func)(struct device dev);
	};

	struct gpio_rv32m1_data {
	/* port ISR callback routine address */
	sys_slist_t callbacks;
	/* pin callback routine enable flags, by pin number */
	u32_t pin_callback_enables;
	};

	static int gpio_rv32m1_configure(struct device *dev,
	int access_op, u32_t pin, int flags)
	{
	const struct gpio_rv32m1_config *config = dev->config->config_info;
	GPIO_Type *gpio_base = config->gpio_base;
	PORT_Type *port_base = config->port_base;
	port_interrupt_t port_interrupt = 0;
	u32_t mask = 0U;
	u32_t pcr = 0U;
	u8_t i;

	/* Check for an invalid pin configuration */
	if ((flags & GPIO_INT) && (flags & GPIO_DIR_OUT)) {
	return -EINVAL;
	}

	/* Check if GPIO port supports interrupts */
	if ((flags & GPIO_INT) && ((config->flags & GPIO_INT) == 0U)) {
	return -EINVAL;
	}

	/* The flags contain options that require touching registers in the
	* GPIO module and the corresponding PORT module.
	*
	* Start with the GPIO module and set up the pin direction register.
	* 0 - pin is input, 1 - pin is output
	*/

	if (access_op == GPIO_ACCESS_BY_PIN) {
	if ((flags & GPIO_DIR_MASK) == GPIO_DIR_IN) {
	gpio_base->PDDR &= ~BIT(pin);
	} else { /* GPIO_DIR_OUT */
	gpio_base->PDDR \|= BIT(pin);
	}
	} else { /* GPIO_ACCESS_BY_PORT */
	if ((flags & GPIO_DIR_MASK) == GPIO_DIR_IN) {
	gpio_base->PDDR = 0x0;
	} else { /* GPIO_DIR_OUT */
	gpio_base->PDDR = 0xFFFFFFFF;
	}
	}

	/* Now do the PORT module. Figure out the pullup/pulldown
	* configuration, but don't write it to the PCR register yet.
	*/
	mask \|= PORT_PCR_PE_MASK \| PORT_PCR_PS_MASK;

	if ((flags & GPIO_PUD_MASK) == GPIO_PUD_PULL_UP) {
	/* Enable the pull and select the pullup resistor. */
	pcr \|= PORT_PCR_PE_MASK \| PORT_PCR_PS_MASK;

	} else if ((flags & GPIO_PUD_MASK) == GPIO_PUD_PULL_DOWN) {
	/* Enable the pull and select the pulldown resistor (deselect
	* the pullup resistor.
	*/
	pcr \|= PORT_PCR_PE_MASK;
	}

	/* Still in the PORT module. Figure out the interrupt configuration,
	* but don't write it to the PCR register yet.
	*/
	mask \|= PORT_PCR_IRQC_MASK;

	if (flags & GPIO_INT) {
	if (flags & GPIO_INT_EDGE) {
	if (flags & GPIO_INT_ACTIVE_HIGH) {
	port_interrupt = kPORT_InterruptRisingEdge;
	} else if (flags & GPIO_INT_DOUBLE_EDGE) {
	port_interrupt = kPORT_InterruptEitherEdge;
	} else {
	port_interrupt = kPORT_InterruptFallingEdge;
	}
	} else { /* GPIO_INT_LEVEL */
	if (flags & GPIO_INT_ACTIVE_HIGH) {
	port_interrupt = kPORT_InterruptLogicOne;
	} else {
	port_interrupt = kPORT_InterruptLogicZero;
	}
	}
	pcr \|= PORT_PCR_IRQC(port_interrupt);
	}

	mask \|= PORT_PCR_MUX_MASK;

	/* Now we can write the PORT PCR register(s). If accessing by pin, we
	* only need to write one PCR register. Otherwise, write all the PCR
	* registers in the PORT module (one for each pin).
	*/
	if (access_op == GPIO_ACCESS_BY_PIN) {
	port_base->PCR[pin] = (port_base->PCR[pin] & ~mask) \| pcr \|
	PORT_PCR_MUX(kPORT_MuxAsGpio);
	} else { /* GPIO_ACCESS_BY_PORT */
	for (i = 0U; i < ARRAY_SIZE(port_base->PCR); i++) {
	port_base->PCR[i] = (port_base->PCR[pin] & ~mask) \| pcr
	\| PORT_PCR_MUX(kPORT_MuxAsGpio);
	}
	}

	return 0;
	}

	static int gpio_rv32m1_write(struct device *dev,
	int access_op, u32_t pin, u32_t value)
	{
	const struct gpio_rv32m1_config *config = dev->config->config_info;
	GPIO_Type *gpio_base = config->gpio_base;

	if (access_op == GPIO_ACCESS_BY_PIN) {
	if (value) {
	/* Set the data output for the corresponding pin.
	* Writing zeros to the other bits leaves the data
	* output unchanged for the other pins.
	*/
	gpio_base->PSOR = BIT(pin);
	} else {
	/* Clear the data output for the corresponding pin.
	* Writing zeros to the other bits leaves the data
	* output unchanged for the other pins.
	*/
	gpio_base->PCOR = BIT(pin);
	}
	} else { /* GPIO_ACCESS_BY_PORT */
	/* Write the data output for all the pins */
	gpio_base->PDOR = value;
	}

	return 0;
	}

	static int gpio_rv32m1_read(struct device *dev,
	int access_op, u32_t pin, u32_t *value)
	{
	const struct gpio_rv32m1_config *config = dev->config->config_info;
	GPIO_Type *gpio_base = config->gpio_base;

	*value = gpio_base->PDIR;

	if (access_op == GPIO_ACCESS_BY_PIN) {
	value = (value & BIT(pin)) >> pin;
	}

	/* nothing more to do for GPIO_ACCESS_BY_PORT */

	return 0;
	}

	static int gpio_rv32m1_manage_callback(struct device *dev,
	struct gpio_callback *callback, bool set)
	{
	struct gpio_rv32m1_data *data = dev->driver_data;

	gpio_manage_callback(&data->callbacks, callback, set);

	return 0;
	}

	static int gpio_rv32m1_enable_callback(struct device *dev,
	int access_op, u32_t pin)
	{
	struct gpio_rv32m1_data *data = dev->driver_data;

	if (access_op == GPIO_ACCESS_BY_PIN) {
	data->pin_callback_enables \|= BIT(pin);
	} else {
	data->pin_callback_enables = 0xFFFFFFFF;
	}

	return 0;
	}

	static int gpio_rv32m1_disable_callback(struct device *dev,
	int access_op, u32_t pin)
	{
	struct gpio_rv32m1_data *data = dev->driver_data;

	if (access_op == GPIO_ACCESS_BY_PIN) {
	data->pin_callback_enables &= ~BIT(pin);
	} else {
	data->pin_callback_enables = 0U;
	}

	return 0;
	}

	static void gpio_rv32m1_port_isr(void *arg)
	{
	struct device dev = (struct device )arg;
	const struct gpio_rv32m1_config *config = dev->config->config_info;
	struct gpio_rv32m1_data *data = dev->driver_data;
	u32_t enabled_int, int_status;

	int_status = config->port_base->ISFR;
	enabled_int = int_status & data->pin_callback_enables;

	gpio_fire_callbacks(&data->callbacks, dev, enabled_int);

	/* Clear the port interrupts */
	config->port_base->ISFR = 0xFFFFFFFF;
	}

	static int gpio_rv32m1_init(struct device *dev)
	{
	const struct gpio_rv32m1_config *config = dev->config->config_info;
	struct device *clk;
	int ret;

	if (config->clock_controller) {
	clk = device_get_binding(config->clock_controller);
	if (!clk) {
	return -ENODEV;
	}

	ret = clock_control_on(clk, config->clock_subsys);

	if (ret < 0) {
	return ret;
	}
	}

	return config->irq_config_func(dev);
	}

	static const struct gpio_driver_api gpio_rv32m1_driver_api = {
	.config = gpio_rv32m1_configure,
	.write = gpio_rv32m1_write,
	.read = gpio_rv32m1_read,
	.manage_callback = gpio_rv32m1_manage_callback,
	.enable_callback = gpio_rv32m1_enable_callback,
	.disable_callback = gpio_rv32m1_disable_callback,
	};

	#ifdef CONFIG_GPIO_RV32M1_PORTA
	static int gpio_rv32m1_porta_init(struct device *dev);

	static const struct gpio_rv32m1_config gpio_rv32m1_porta_config = {
	.gpio_base = (GPIO_Type *) DT_OPENISA_RV32M1_GPIO_GPIO_A_BASE_ADDRESS,
	.port_base = PORTA,
	#ifdef DT_OPENISA_RV32M1_GPIO_GPIO_A_IRQ_0
	.flags = GPIO_INT,
	#else
	.flags = 0,
	#endif
	.irq_config_func = gpio_rv32m1_porta_init,
	#ifdef DT_OPENISA_RV32M1_GPIO_GPIO_A_CLOCK_CONTROLLER
	.clock_controller = DT_OPENISA_RV32M1_GPIO_GPIO_A_CLOCK_CONTROLLER,
	.clock_subsys = (clock_control_subsys_t)
	DT_OPENISA_RV32M1_GPIO_GPIO_A_CLOCK_NAME,
	#else
	.clock_controller = NULL,
	#endif
	};

	static struct gpio_rv32m1_data gpio_rv32m1_porta_data;

	DEVICE_AND_API_INIT(gpio_rv32m1_porta, DT_OPENISA_RV32M1_GPIO_GPIO_A_LABEL,
	gpio_rv32m1_init,
	&gpio_rv32m1_porta_data, &gpio_rv32m1_porta_config,
	POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
	&gpio_rv32m1_driver_api);

	static int gpio_rv32m1_porta_init(struct device *dev)
	{
	#ifdef DT_OPENISA_RV32M1_GPIO_GPIO_A_IRQ_0
	IRQ_CONNECT(DT_OPENISA_RV32M1_GPIO_GPIO_A_IRQ_0,
	0,
	gpio_rv32m1_port_isr, DEVICE_GET(gpio_rv32m1_porta), 0);

	irq_enable(DT_OPENISA_RV32M1_GPIO_GPIO_A_IRQ_0);

	return 0;
	#else
	return -1;
	#endif
	}
	#endif /* CONFIG_GPIO_RV32M1_PORTA */

	#ifdef CONFIG_GPIO_RV32M1_PORTB
	static int gpio_rv32m1_portb_init(struct device *dev);

	static const struct gpio_rv32m1_config gpio_rv32m1_portb_config = {
	.gpio_base = (GPIO_Type *) DT_OPENISA_RV32M1_GPIO_GPIO_B_BASE_ADDRESS,
	.port_base = PORTB,
	#ifdef DT_OPENISA_RV32M1_GPIO_GPIO_B_IRQ_0
	.flags = GPIO_INT,
	#else
	.flags = 0,
	#endif
	.irq_config_func = gpio_rv32m1_portb_init,
	#ifdef DT_OPENISA_RV32M1_GPIO_GPIO_B_CLOCK_CONTROLLER
	.clock_controller = DT_OPENISA_RV32M1_GPIO_GPIO_B_CLOCK_CONTROLLER,
	.clock_subsys = (clock_control_subsys_t)
	DT_OPENISA_RV32M1_GPIO_GPIO_B_CLOCK_NAME,
	#else
	.clock_controller = NULL,
	#endif
	};

	static struct gpio_rv32m1_data gpio_rv32m1_portb_data;

	DEVICE_AND_API_INIT(gpio_rv32m1_portb, DT_OPENISA_RV32M1_GPIO_GPIO_B_LABEL,
	gpio_rv32m1_init,
	&gpio_rv32m1_portb_data, &gpio_rv32m1_portb_config,
	POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
	&gpio_rv32m1_driver_api);

	static int gpio_rv32m1_portb_init(struct device *dev)
	{
	#ifdef DT_OPENISA_RV32M1_GPIO_GPIO_B_IRQ_0
	IRQ_CONNECT(DT_OPENISA_RV32M1_GPIO_GPIO_B_IRQ_0,
	0,
	gpio_rv32m1_port_isr, DEVICE_GET(gpio_rv32m1_portb), 0);

	irq_enable(DT_OPENISA_RV32M1_GPIO_GPIO_B_IRQ_0);

	return 0;
	#else
	return -1;
	#endif
	}
	#endif /* CONFIG_GPIO_RV32M1_PORTB */

	#ifdef CONFIG_GPIO_RV32M1_PORTC
	static int gpio_rv32m1_portc_init(struct device *dev);

	static const struct gpio_rv32m1_config gpio_rv32m1_portc_config = {
	.gpio_base = (GPIO_Type *) DT_OPENISA_RV32M1_GPIO_GPIO_C_BASE_ADDRESS,
	.port_base = PORTC,
	#ifdef DT_OPENISA_RV32M1_GPIO_GPIO_C_IRQ_0
	.flags = GPIO_INT,
	#else
	.flags = 0,
	#endif
	.irq_config_func = gpio_rv32m1_portc_init,
	#ifdef DT_OPENISA_RV32M1_GPIO_GPIO_C_CLOCK_CONTROLLER
	.clock_controller = DT_OPENISA_RV32M1_GPIO_GPIO_C_CLOCK_CONTROLLER,
	.clock_subsys = (clock_control_subsys_t)
	DT_OPENISA_RV32M1_GPIO_GPIO_C_CLOCK_NAME,
	#else
	.clock_controller = NULL,
	#endif

	};

	static struct gpio_rv32m1_data gpio_rv32m1_portc_data;

	DEVICE_AND_API_INIT(gpio_rv32m1_portc, DT_OPENISA_RV32M1_GPIO_GPIO_C_LABEL,
	gpio_rv32m1_init,
	&gpio_rv32m1_portc_data, &gpio_rv32m1_portc_config,
	POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
	&gpio_rv32m1_driver_api);

	static int gpio_rv32m1_portc_init(struct device *dev)
	{
	#ifdef DT_OPENISA_RV32M1_GPIO_GPIO_C_IRQ_0
	IRQ_CONNECT(DT_OPENISA_RV32M1_GPIO_GPIO_C_IRQ_0,
	0,
	gpio_rv32m1_port_isr, DEVICE_GET(gpio_rv32m1_portc), 0);

	irq_enable(DT_OPENISA_RV32M1_GPIO_GPIO_C_IRQ_0);

	return 0;
	#else
	return -1;
	#endif
	}
	#endif /* CONFIG_GPIO_RV32M1_PORTC */

	#ifdef CONFIG_GPIO_RV32M1_PORTD
	static int gpio_rv32m1_portd_init(struct device *dev);

	static const struct gpio_rv32m1_config gpio_rv32m1_portd_config = {
	.gpio_base = (GPIO_Type *) DT_OPENISA_RV32M1_GPIO_GPIO_D_BASE_ADDRESS,
	.port_base = PORTD,
	#ifdef DT_OPENISA_RV32M1_GPIO_GPIO_D_IRQ_0
	.flags = GPIO_INT,
	#else
	.flags = 0,
	#endif
	.irq_config_func = gpio_rv32m1_portd_init,
	#ifdef DT_OPENISA_RV32M1_GPIO_GPIO_D_CLOCK_CONTROLLER
	.clock_controller = DT_OPENISA_RV32M1_GPIO_GPIO_D_CLOCK_CONTROLLER,
	.clock_subsys = (clock_control_subsys_t)
	DT_OPENISA_RV32M1_GPIO_GPIO_D_CLOCK_NAME,
	#else
	.clock_controller = NULL,
	#endif
	};

	static struct gpio_rv32m1_data gpio_rv32m1_portd_data;

	DEVICE_AND_API_INIT(gpio_rv32m1_portd, DT_OPENISA_RV32M1_GPIO_GPIO_D_LABEL,
	gpio_rv32m1_init,
	&gpio_rv32m1_portd_data, &gpio_rv32m1_portd_config,
	POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
	&gpio_rv32m1_driver_api);

	static int gpio_rv32m1_portd_init(struct device *dev)
	{
	#ifdef DT_OPENISA_RV32M1_GPIO_GPIO_D_IRQ_0
	IRQ_CONNECT(DT_OPENISA_RV32M1_GPIO_GPIO_D_IRQ_0,
	0,
	gpio_rv32m1_port_isr, DEVICE_GET(gpio_rv32m1_portd), 0);

	irq_enable(DT_OPENISA_RV32M1_GPIO_GPIO_D_IRQ_0);

	return 0;
	#else
	return -1;
	#endif
	}
	#endif /* CONFIG_GPIO_RV32M1_PORTD */

	#ifdef CONFIG_GPIO_RV32M1_PORTE
	static int gpio_rv32m1_porte_init(struct device *dev);

	static const struct gpio_rv32m1_config gpio_rv32m1_porte_config = {
	.gpio_base = (GPIO_Type *) DT_OPENISA_RV32M1_GPIO_GPIO_E_BASE_ADDRESS,
	.port_base = PORTE,
	#ifdef DT_OPENISA_RV32M1_GPIO_GPIO_E_IRQ_0
	.flags = GPIO_INT,
	#else
	.flags = 0,
	#endif
	.irq_config_func = gpio_rv32m1_porte_init,
	#ifdef DT_OPENISA_RV32M1_GPIO_GPIO_E_CLOCK_CONTROLLER
	.clock_controller = DT_OPENISA_RV32M1_GPIO_GPIO_E_CLOCK_CONTROLLER,
	.clock_subsys = (clock_control_subsys_t)
	DT_OPENISA_RV32M1_GPIO_GPIO_E_CLOCK_NAME,
	#else
	.clock_controller = NULL,
	#endif
	};

	static struct gpio_rv32m1_data gpio_rv32m1_porte_data;

	DEVICE_AND_API_INIT(gpio_rv32m1_porte, DT_OPENISA_RV32M1_GPIO_GPIO_E_LABEL,
	gpio_rv32m1_init,
	&gpio_rv32m1_porte_data, &gpio_rv32m1_porte_config,
	POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
	&gpio_rv32m1_driver_api);

	static int gpio_rv32m1_porte_init(struct device *dev)
	{
	#ifdef DT_OPENISA_RV32M1_GPIO_GPIO_E_IRQ_0
	IRQ_CONNECT(DT_OPENISA_RV32M1_GPIO_GPIO_E_IRQ_0,
	0,
	gpio_rv32m1_port_isr, DEVICE_GET(gpio_rv32m1_porte), 0);

	irq_enable(DT_OPENISA_RV32M1_GPIO_GPIO_E_IRQ_0);

	return 0;
	#else
	return -1;
	#endif
	}
	#endif /* CONFIG_GPIO_RV32M1_PORTE */