text: /****************************************************************************
   * boards/arm/tms570/tms570ls31x-usb-kit/src/tms570_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 <nuttx/spi/spi.h>
  #include <arch/board/board.h>
  
  #include "arm_internal.h"
  #include "chip.h"
  #include "tms570_spi.h"
  #include "tms570ls31x_usb_kit.h"
  
  #if defined(CONFIG_TMS570_SPI1) || defined(CONFIG_TMS570_SPI4)
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: tms570_spidev_initialize
   *
   * Description:
   *   Called to configure SPI chip select GPIO pins for the HY-MiniTMS570
   *   board.
   *
   ****************************************************************************/
  
  void tms570_spidev_initialize(void)
  {
  #ifdef CONFIG_MMCSD_SPI
  #if defined (CONFIG_TMS570_SPI1)
      tms570_spi_gio_config(SPI1_SDCARD_CS);       /* SD/MMC Card chip select */
  #endif
  #if defined (CONFIG_TMS570_SPI4)
      tms570_spi_gio_config(SPI4_SDCARD_CS);
  #endif
  #endif
  }
  
  /****************************************************************************
   * Name:  tms570_spi1/2select and tms570_spi1/2status
   *
   * Description:
   *   The external functions, tms570_spi1/2/3select and tms570_spi1/2/3status
   *   must be provided by board-specific logic.
   *   They are implementations of the select and status methods of the SPI
   *   interface defined by struct spi_ops_s (see include/nuttx/spi/spi.h).
   *   All other methods (including tms570_spibus_initialize())
   *   are provided by common TMS570 logic.
   *   To use this common SPI logic on your board:
   *
   *   1. Provide logic in tms570_boardinitialize() to configure SPI chip
   *      select pins.
   *   2. Provide tms570_spi1/2/3select() and tms570_spi1/2/3status() functions
   *      in your board-specific logic.
   *      These functions will perform chip selection and status operations
   *      using GPIOs in the way your board is configured.
   *   3. Add a calls to tms570_spibus_initialize() in your low level
   *      application initialization logic
   *   4. The handle returned by tms570_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).
   *
   ****************************************************************************/
  
  #ifdef CONFIG_TMS570_SPI1
  void tms570_spi1select(struct spi_dev_s *dev, uint32_t devid,
                         bool selected)
  {
  #ifdef CONFIG_MMCSD_SPI
    if (devid == SPIDEV_MMCSD(0))
      {
        tms570_spi_giowrite(SPI1_SDCARD_CS, !selected);
      }
  #endif
  }
  
  uint8_t tms570_spi1status(struct spi_dev_s *dev, uint32_t devid)
  {
    uint8_t status = 0;
  
  #ifdef CONFIG_MMCSD_SPI
    if (devid == SPIDEV_MMCSD(0))
      {
         status |= SPI_STATUS_PRESENT;
      }
  #endif
  
    return status;
  }
  #endif
  
  #ifdef CONFIG_TMS570_SPI4
  void tms570_spi4select(struct spi_dev_s *dev, uint32_t devid,
                         bool selected)
  {
  #ifdef CONFIG_MMCSD_SPI
    if (devid == SPIDEV_MMCSD(0))
      {
        tms570_spi_giowrite(SPI4_SDCARD_CS, !selected);
      }
  #endif
  }
  
  uint8_t tms570_spi4status(struct spi_dev_s *dev, uint32_t devid)
  {
    uint8_t status = 0;
  
  #ifdef CONFIG_MMCSD_SPI
    if (devid == SPIDEV_MMCSD(0))
      {
         status |= SPI_STATUS_PRESENT;
      }
  #endif
  
    return status;
  }
  #endif
  #endif /* CONFIG_TMS570_SPI1 || CONFIG_TMS570_SPI2 */
  