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