source: rtems/bsps/arm/atsam/include/bsp/sc16is752.h @ 6fc04f4c

/* SPDX-License-Identifier: BSD-2-Clause */

/*
 * Copyright (c) 2016 embedded brains GmbH.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef LIBBSP_ARM_ATSAM_SC16IS752_H
#define LIBBSP_ARM_ATSAM_SC16IS752_H

#include <rtems/irq-extension.h>
#include <libchip/chip.h>

#include <dev/serial/sc16is752.h>

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

/**
 * @brief The SC16IS752 device context.
 *
 * All members are private to the device driver.
 */
typedef struct {
  sc16is752_spi_context base;
  Pin irq_pin;
  rtems_interrupt_server_entry irqs_entry;
  rtems_interrupt_server_action irqs_action;
  uint32_t irqs_index;
} atsam_sc16is752_spi_context;

/**
 * @brief The SC16IS752 device configuration.
 *
 * @see atsam_sc16is752_spi_create().
 */
typedef struct {
  /**
   * @brief The device file path for the new device.
   */
  const char *device_path;

  /**
   * @brief The SC16IS752 mode.
   */
  sc16is752_mode mode;

  /**
   * @brief The input frequency in Hertz of the SC16IS752 chip.  See XTAL1 and
   * XTAL2 pins.
   */
  uint32_t input_frequency;

  /**
   * @brief The SPI bus device path.
   */
  const char *spi_path;

  /**
   * @brief The SPI chip select (starts with 0, the SPI driver uses
   * SPI_ChipSelect(1 << spi_chip_select)).
   */
  uint8_t spi_chip_select;

  /**
   * @brief The SPI bus speed in Hertz.
   */
  uint32_t spi_speed_hz;

  /**
   * @brief The interrupt pin, e.g. { PIO_PD28, PIOD, ID_PIOD, PIO_INPUT,
   * PIO_IT_LOW_LEVEL }.
   */
  const Pin irq_pin;

  /**
   * @brief The index to identify the interrupt server used for interrupt
   * processing.
   */
  uint32_t server_index;
} atsam_sc16is752_spi_config;

/**
 * @brief Creates an SPI connected SC16IS752 device.
 *
 * This devices uses the interrupt server, see rtems_interrupt_server_create().
 *
 * The device claims the interrupt of the PIO block.
 *
 * @param[out] ctx is the device context.  It may have an arbitrary content.
 * @param config is the device configuration.
 *
 * @return See sc16is752_spi_create().
 */
int atsam_sc16is752_spi_create(
  atsam_sc16is752_spi_context      *ctx,
  const atsam_sc16is752_spi_config *config
);

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* LIBBSP_ARM_ATSAM_SC16IS752_H */