blob: 14b0b6c45182b9d66c972b1d83adfba548d11c52 [file] [log] [blame]
/*
* Copyright (c) 2017 Intel Corporation.
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file Driver for the Altera Nios-II PIO Core.
*/
#include <errno.h>
#include <kernel.h>
#include <device.h>
#include <init.h>
#include <soc.h>
#include <gpio.h>
#include "gpio_utils.h"
#include "altera_avalon_pio_regs.h"
typedef int (*config_func_t)(struct device *dev, int access_op,
u32_t pin, int flags);
/* Configuration data */
struct gpio_nios2_config {
u32_t pio_base;
config_func_t config_func;
};
static int gpio_nios2_config_oput_port(struct device *dev, int access_op,
u32_t pin, int flags)
{
if ((flags & GPIO_DIR_IN) || (flags & GPIO_INT)) {
return -ENOTSUP;
}
if (access_op == GPIO_ACCESS_BY_PIN) {
return -ENOTSUP;
}
return 0;
}
/**
* @brief Configure pin or port
*
* @param dev Device struct
* @param access_op Access operation (pin or port)
* @param pin The pin number
* @param flags Flags of pin or port
*
* @return 0 if successful, failed otherwise
*/
static int gpio_nios2_config(struct device *dev, int access_op,
u32_t pin, int flags)
{
const struct gpio_nios2_config *cfg = dev->config->config_info;
if (cfg->config_func) {
return cfg->config_func(dev, access_op, pin, flags);
}
return 0;
}
/**
* @brief Set the pin or port output
*
* @param dev Device struct
* @param access_op Access operation (pin or port)
* @param pin The pin number
* @param value Value to set (0 or 1)
*
* @return 0 if successful, failed otherwise
*/
static int gpio_nios2_write(struct device *dev, int access_op,
u32_t pin, u32_t value)
{
const struct gpio_nios2_config *cfg = dev->config->config_info;
switch (access_op) {
case GPIO_ACCESS_BY_PIN:
if (value) {
/* set the pin */
IOWR_ALTERA_AVALON_PIO_SET_BITS(cfg->pio_base,
BIT(pin));
} else {
/* clear the pin */
IOWR_ALTERA_AVALON_PIO_CLEAR_BITS(cfg->pio_base,
BIT(pin));
}
break;
case GPIO_ACCESS_BY_PORT:
IOWR_ALTERA_AVALON_PIO_DATA(cfg->pio_base, value);
break;
default:
return -ENOTSUP;
}
return 0;
}
/**
* @brief Read the pin or port status
*
* @param dev Device struct
* @param access_op Access operation (pin or port)
* @param pin The pin number
* @param value Value of input pin(s)
*
* @return 0 if successful, failed otherwise
*/
static int gpio_nios2_read(struct device *dev, int access_op,
u32_t pin, u32_t *value)
{
const struct gpio_nios2_config *cfg = dev->config->config_info;
*value = IORD_ALTERA_AVALON_PIO_DATA(cfg->pio_base);
switch (access_op) {
case GPIO_ACCESS_BY_PIN:
*value = (*value >> pin) & 0x01;
break;
case GPIO_ACCESS_BY_PORT:
break;
default:
return -ENOTSUP;
}
return 0;
}
static const struct gpio_driver_api gpio_nios2_drv_api_funcs = {
.config = gpio_nios2_config,
.write = gpio_nios2_write,
.read = gpio_nios2_read,
};
/* Output only Port */
#ifdef CONFIG_GPIO_ALTERA_NIOS2_OUTPUT
static const struct gpio_nios2_config gpio_nios2_oput_cfg = {
.pio_base = LED_BASE,
.config_func = gpio_nios2_config_oput_port,
};
/**
* @brief Initialization function of PIO
*
* @param dev Device struct
* @return 0 if successful, failed otherwise.
*/
static int gpio_nios2_oput_init(struct device *dev)
{
return 0;
}
DEVICE_AND_API_INIT(gpio_nios2_oput, CONFIG_GPIO_ALTERA_NIOS2_OUTPUT_DEV_NAME,
gpio_nios2_oput_init, NULL, &gpio_nios2_oput_cfg,
POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
&gpio_nios2_drv_api_funcs);
#endif /* CONFIG_GPIO_ALTERA_NIOS2_OUTPUT */