text: /****************************************************************************
   * boards/arm/sama5/sama5d3x-ek/src/sam_spi.c
   *
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.  The
   * ASF licenses this file to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance with the
   * License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
   * License for the specific language governing permissions and limitations
   * under the License.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <stdint.h>
  #include <stdbool.h>
  #include <debug.h>
  #include <errno.h>
  
  #include <nuttx/spi/spi.h>
  #include <arch/board/board.h>
  
  #include "arm_arch.h"
  #include "chip.h"
  #include "sam_pio.h"
  #include "sam_spi.h"
  #include "sama5d3x-ek.h"
  
  #if defined(CONFIG_SAMA5_SPI0) || defined(CONFIG_SAMA5_SPI1)
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: sam_spidev_initialize
   *
   * Description:
   *   Called to configure SPI chip select PIO pins for the SAMA5D3x-EK board.
   *
   ****************************************************************************/
  
  void weak_function sam_spidev_initialize(void)
  {
  #ifdef CONFIG_SAMA5_SPI0
  #ifdef CONFIG_MTD_AT25
    /* The AT25 serial FLASH connects using NPCS0 */
  
    sam_configpio(PIO_AT25_NPCS0);
  #endif
  #endif
  
  #ifdef CONFIG_SAMA5_SPI1
  #endif
  }
  
  /****************************************************************************
   * Name:  sam_spi[0|1]select, sam_spi[0|1]status, and sam_spi[0|1]cmddata
   *
   * Description:
   *   These external functions must be provided by board-specific logic.  They
   *   include:
   *
   *   o sam_spi[0|1]select is a functions tomanage the board-specific chip
   *            selects
   *   o sam_spi[0|1]status and sam_spi[0|1]cmddata:
   *     Implementations of the status and cmddata methods of the SPI interface
   *     defined by struct spi_ops_ (see include/nuttx/spi/spi.h).
   *     All other methods including sam_spibus_initialize()) are provided
   *     by common SAM3/4 logic.
   *
   *  To use this common SPI logic on your board:
   *
   *   1. Provide logic in sam_boardinitialize() to configure SPI chip select
   *      pins.
   *   2. Provide sam_spi[0|1]select() and sam_spi[0|1]status() functions in
   *      your board-specific logic.
   *      These functions will perform chip selection and status operations
   *      using PIOs in the way your board is configured.
   *   2. If CONFIG_SPI_CMDDATA is defined in the NuttX configuration, provide
   *      sam_spi[0|1]cmddata() functions in your board-specific logic.  This
   *      function will perform cmd/data selection operations using PIOs in
   *      the way your board is configured.
   *   3. Add a call to sam_spibus_initialize() in your low level application
   *      initialization logic
   *   4. The handle returned by sam_spibus_initialize() may then be used to
   *      bind the SPI driver to higher level logic (e.g., calling
   *      mmcsd_spislotinitialize(), for example, will bind the SPI driver to
   *      the SPI MMC/SD driver).
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Name: sam_spi[0|1]select
   *
   * Description:
   *   PIO chip select pins may be programmed by the board specific logic in
   *   one of two different ways.  First, the pins may be programmed as SPI
   *   peripherals.  In that case, the pins are completely controlled by the
   *   SPI driver.  This method still needs to be provided, but it may be only
   *   a stub.
   *
   *   An alternative way to program the PIO chip select pins is as a normal
   *   PIO output.  In that case, the automatic control of the CS pins is
   *   bypassed and this function must provide control of the chip select.
   *   NOTE:  In this case, the PIO output pin does *not* have to be the
   *   same as the NPCS pin normal associated with the chip select number.
   *
   * Input Parameters:
   *   devid - Identifies the (logical) device
   *   selected - TRUE:Select the device, FALSE:De-select the device
   *
   * Returned Value:
   *   None
   *
   ****************************************************************************/
  
  #ifdef CONFIG_SAMA5_SPI0
  void sam_spi0select(uint32_t devid, bool selected)
  {
  #ifdef CONFIG_MTD_AT25
    /* The AT25 serial FLASH connects using NPCS0 */
  
    if (devid == SPIDEV_FLASH(0))
      {
        sam_piowrite(PIO_AT25_NPCS0, !selected);
      }
  #endif
  }
  #endif
  
  #ifdef CONFIG_SAMA5_SPI1
  void sam_spi1select(uint32_t devid, bool selected)
  {
  }
  #endif
  
  /****************************************************************************
   * Name: sam_spi[0|1]status
   *
   * Description:
   *   Return status information associated with the SPI device.
   *
   * Input Parameters:
   *   devid - Identifies the (logical) device
   *
   * Returned Value:
   *   Bit-encoded SPI status (see include/nuttx/spi/spi.h.
   *
   ****************************************************************************/
  
  #ifdef CONFIG_SAMA5_SPI0
  uint8_t sam_spi0status(FAR struct spi_dev_s *dev, uint32_t devid)
  {
    return 0;
  }
  #endif
  
  #ifdef CONFIG_SAMA5_SPI0
  uint8_t sam_spi1status(FAR struct spi_dev_s *dev, uint32_t devid)
  {
    return 0;
  }
  #endif
  
  #endif /* CONFIG_SAMA5_SPI0 || CONFIG_SAMA5_SPI1 */
  