/****************************************************************************
 * config/kwikstik-k40/src/up_nsh.c
 * arch/arm/src/board/up_nsh.c
 *
 *   Copyright (C) 2011 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>

#ifdef CONFIG_KINETIS_SDHC
#  include <nuttx/sdio.h>
#  include <nuttx/mmcsd.h>
#endif

#include "kinetis_internal.h"
#include "kwikstik-internal.h"

/****************************************************************************
 * Pre-Processor Definitions
 ****************************************************************************/
/* Configuration ************************************************************/

/* PORT and SLOT number probably depend on the board configuration */

#ifdef CONFIG_ARCH_BOARD_KWIKSTIK_K40
#  define NSH_HAVEUSBDEV 1
#  define NSH_HAVEMMCSD  1
#  if defined(CONFIG_NSH_MMCSDSLOTNO) && CONFIG_NSH_MMCSDSLOTNO != 0
#    error "Only one MMC/SD slot, slot 0"
#    undef CONFIG_NSH_MMCSDSLOTNO
#  endif
#  ifndef CONFIG_NSH_MMCSDSLOTNO
#    define CONFIG_NSH_MMCSDSLOTNO 0
#  endif
#else
   /* Add configuration for new Kinetis boards here */
#  error "Unrecognized Kinetis board"
#  undef NSH_HAVEUSBDEV
#  undef NSH_HAVEMMCSD
#endif

/* Can't support USB features if USB is not enabled */

#ifndef CONFIG_USBDEV
#  undef NSH_HAVEUSBDEV
#endif

/* Can't support MMC/SD features if mountpoints are disabled or if SDHC support
 * is not enabled.
 */

#if defined(CONFIG_DISABLE_MOUNTPOINT) || !defined(CONFIG_KINETIS_SDHC)
#  undef NSH_HAVEMMCSD
#endif

#ifndef CONFIG_NSH_MMCSDMINOR
#  define CONFIG_NSH_MMCSDMINOR 0
#endif

/* We expect to receive GPIO interrupts for card insertion events */

#ifndef CONFIG_GPIO_IRQ
#  error "CONFIG_GPIO_IRQ required for card detect interrupt"
#endif

#ifndef CONFIG_KINETIS_PORTEINTS
#  error "CONFIG_KINETIS_PORTEINTS required for card detect interrupt"
#endif

/* Debug ********************************************************************/

#ifdef CONFIG_CPP_HAVE_VARARGS
#  ifdef CONFIG_DEBUG
#    define message(...) lowsyslog(__VA_ARGS__)
#  else
#    define message(...) printf(__VA_ARGS__)
#  endif
#else
#  ifdef CONFIG_DEBUG
#    define message lowsyslog
#  else
#    define message printf
#  endif
#endif

/****************************************************************************
 * Private Types
 ****************************************************************************/

/* This structure encapsulates the global variable used in this file and
 * reduces the probability of name collistions.
 */

#ifdef NSH_HAVEMMCSD
struct kinetis_nsh_s
{
  FAR struct sdio_dev_s *sdhc; /* SDIO driver handle */
  bool inserted;               /* True: card is inserted */
};
#endif

/****************************************************************************
 * Private Data
 ****************************************************************************/

#ifdef NSH_HAVEMMCSD
static struct kinetis_nsh_s g_nsh;
#endif

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Name: kinetis_mediachange
 ****************************************************************************/

#ifdef NSH_HAVEMMCSD
static void kinetis_mediachange(void)
{
  bool inserted;

  /* Get the current value of the card detect pin.  This pin is pulled up on
   * board.  So low means that a card is present.
   */

  inserted = !kinetis_gpioread(GPIO_SD_CARDDETECT);

  /* Has the pin changed state? */

  if (inserted != g_nsh.inserted)
    {
      /* Yes.. perform the appropriate action (this might need some debounce). */

      g_nsh.inserted = inserted;
      sdhc_mediachange(g_nsh.sdhc, inserted);
    }
}
#endif

/****************************************************************************
 * Name: kinetis_cdinterrupt
 ****************************************************************************/

#ifdef NSH_HAVEMMCSD
static int kinetis_cdinterrupt(int irq, FAR void *context)
{
  /* All of the work is done by kinetis_mediachange() */

  kinetis_mediachange();
  return OK;
}
#endif

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: nsh_archinitialize
 *
 * Description:
 *   Perform architecture specific initialization
 *
 ****************************************************************************/

int nsh_archinitialize(void)
{
#ifdef NSH_HAVEMMCSD
  int ret;

  /* Configure GPIO pins.
   *
   * First CD power.  The initial state will provide SD power.
   */

  kinetis_pinconfig(GPIO_SD_CARDON);      /* Applies power to the card */

  /* Attached the card detect interrupt (but don't enable it yet) */

  kinetis_pinconfig(GPIO_SD_CARDDETECT);
  kinetis_pinirqattach(GPIO_SD_CARDDETECT, kinetis_cdinterrupt);

  /* Mount the SDHC-based MMC/SD block driver */
  /* First, get an instance of the SDHC interface */

  message("nsh_archinitialize: Initializing SDHC slot %d\n",
          CONFIG_NSH_MMCSDSLOTNO);

  g_nsh.sdhc = sdhc_initialize(CONFIG_NSH_MMCSDSLOTNO);
  if (!g_nsh.sdhc)
    {
      message("nsh_archinitialize: Failed to initialize SDHC slot %d\n",
              CONFIG_NSH_MMCSDSLOTNO);
      return -ENODEV;
    }

  /* Now bind the SDHC interface to the MMC/SD driver */

  message("nsh_archinitialize: Bind SDHC to the MMC/SD driver, minor=%d\n",
          CONFIG_NSH_MMCSDMINOR);

  ret = mmcsd_slotinitialize(CONFIG_NSH_MMCSDMINOR, g_nsh.sdhc);
  if (ret != OK)
    {
      message("nsh_archinitialize: Failed to bind SDHC to the MMC/SD driver: %d\n", ret);
      return ret;
    }
  message("nsh_archinitialize: Successfully bound SDHC to the MMC/SD driver\n");

  /* Handle the initial card state */

  kinetis_mediachange();

  /* Enable CD interrupts to handle subsequent media changes */

  kinetis_pinirqenable(GPIO_SD_CARDDETECT);
#endif
  return OK;
}