text: /****************************************************************************
   * config/stm32f4discovery/src/stm32_sdio.c
   *
   *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * 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.
   * 3. Neither the name NuttX nor the names of its contributors may be
   *    used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * 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.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <stdbool.h>
  #include <stdio.h>
  #include <debug.h>
  #include <errno.h>
  
  #include <nuttx/sdio.h>
  #include <nuttx/mmcsd.h>
  
  #include "stm32.h"
  #include "stm32f4discovery.h"
  
  #ifdef HAVE_SDIO
  
  /****************************************************************************
   * Pre-processor Definitions
   ****************************************************************************/
  /* Configuration ************************************************************/
  
  /* Card detections requires card support and a card detection GPIO */
  
  #define HAVE_NCD   1
  #if !defined(HAVE_SDIO) || !defined(GPIO_SDIO_NCD)
  #  undef HAVE_NCD
  #endif
  
  /****************************************************************************
   * Private Data
   ****************************************************************************/
  
  static FAR struct sdio_dev_s *g_sdio_dev;
  #ifdef HAVE_NCD
  static bool g_sd_inserted = 0xff; /* Impossible value */
  #endif
  
  /****************************************************************************
   * Private Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: stm32_ncd_interrupt
   *
   * Description:
   *   Card detect interrupt handler.
   *
   ****************************************************************************/
  
  #ifdef HAVE_NCD
  static int stm32_ncd_interrupt(int irq, FAR void *context)
  {
    bool present;
  
    present = !stm32_gpioread(GPIO_SDIO_NCD);
    if (present != g_sd_inserted)
      {
        sdio_mediachange(g_sdio_dev, present);
        g_sd_inserted = present;
      }
  
    return OK;
  }
  #endif
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: stm32_sdio_initialize
   *
   * Description:
   *   Initialize SDIO-based MMC/SD card support
   *
   ****************************************************************************/
  
  int stm32_sdio_initialize(void)
  {
    int ret;
  
  #ifdef HAVE_NCD
    /* Card detect */
  
    bool cd_status;
  
    /* Configure the card detect GPIO */
  
    stm32_configgpio(GPIO_SDIO_NCD);
  
    /* Register an interrupt handler for the card detect pin */
  
    stm32_gpiosetevent(GPIO_SDIO_NCD, true, true, true, stm32_ncd_interrupt);
  #endif
  
    /* Mount the SDIO-based MMC/SD block driver */
    /* First, get an instance of the SDIO interface */
  
    finfo("Initializing SDIO slot %d\n", SDIO_SLOTNO);
  
    g_sdio_dev = sdio_initialize(SDIO_SLOTNO);
    if (!g_sdio_dev)
      {
        ferr("ERROR: Failed to initialize SDIO slot %d\n", SDIO_SLOTNO);
        return -ENODEV;
      }
  
    /* Now bind the SDIO interface to the MMC/SD driver */
  
    finfo("Bind SDIO to the MMC/SD driver, minor=%d\n", SDIO_MINOR);
  
    ret = mmcsd_slotinitialize(SDIO_MINOR, g_sdio_dev);
    if (ret != OK)
      {
        ferr("ERROR: Failed to bind SDIO to the MMC/SD driver: %d\n", ret);
        return ret;
      }
  
    finfo("Successfully bound SDIO to the MMC/SD driver\n");
  
  #ifdef HAVE_NCD
    /* Use SD card detect pin to check if a card is g_sd_inserted */
  
    cd_status = !stm32_gpioread(GPIO_SDIO_NCD);
    finfo("Card detect : %d\n", cd_status);
  
    sdio_mediachange(g_sdio_dev, cd_status);
  #else
    /* Assume that the SD card is inserted.  What choice do we have? */
  
    sdio_mediachange(g_sdio_dev, true);
  #endif
  
    return OK;
  }
  
  #endif /* HAVE_SDIO */
  