text: /****************************************************************************
   * boards/arm/stm32f7/nucleo-144/src/stm32_sdio.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 <stdbool.h>
  #include <stdio.h>
  #include <debug.h>
  #include <errno.h>
  
  #include <nuttx/sdio.h>
  #include <nuttx/mmcsd.h>
  
  #include "chip.h"
  #include "nucleo-144.h"
  #include "stm32_gpio.h"
  #include "stm32_sdmmc.h"
  
  #ifdef CONFIG_MMCSD
  
  /****************************************************************************
   * Pre-processor Definitions
   ****************************************************************************/
  
  /* Configuration ************************************************************/
  
  /* Card detections requires card support and a card detection GPIO */
  
  #define HAVE_NCD   1
  #if !defined(GPIO_SDMMC1_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_SDMMC1_NCD);
    if (g_sdio_dev && 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_SDMMC1_NCD);
  
    /* Register an interrupt handler for the card detect pin */
  
    stm32_gpiosetevent(GPIO_SDMMC1_NCD, true, true, true,
                       stm32_ncd_interrupt, NULL);
  #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_SDMMC1_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 */
  