text: /************************************************************************************
   * configs/zkit-arm-1769/src/up_spi.c
   * arch/arm/src/board/up_spi.c
   *
   *   Copyright (C) 2013 Zilogic Systems. All rights reserved.
   *   Author: Kannan <code@zilogic.com>
   *
   * Based on configs/lpcxpresso-lpc1768/src/up_ssp.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 <stdint.h>
  #include <stdbool.h>
  #include <debug.h>
  
  #include <nuttx/spi/spi.h>
  #include <arch/board/board.h>
  
  #include "up_arch.h"
  #include "chip.h"
  #include "lpc17_spi.h"
  #include "lpc17_gpio.h"
  #include "zkitarm_internal.h"
  
  #if defined(CONFIG_LPC17_SPI)
  
  /************************************************************************************
   * Definitions
   ************************************************************************************/
  
  /* CONFIG_DEBUG_SPI enables debug output from this file (needs CONFIG_DEBUG too) */
  
  #ifdef CONFIG_DEBUG_SPI
  #  define spidbg  lldbg
  #  ifdef CONFIG_DEBUG_VERBOSE
  #    define spivdbg lldbg
  #  else
  #    define spivdbg(x...)
  #  endif
  #else
  #  define spidbg(x...)
  #  define spivdbg(x...)
  #endif
  
  /* Dump GPIO registers */
  
  #if defined(CONFIG_DEBUG_SPI) && defined(CONFIG_DEBUG_VERBOSE)
  #  define spi_dumpgpio(m) lpc17_dumpgpio(SDCCS_GPIO, m)
  #else
  #  define spi_dumpgpio(m)
  #endif
  
  /************************************************************************************
   * Private Functions
   ************************************************************************************/
  
  /************************************************************************************
   * Public Functions
   ************************************************************************************/
  
  /************************************************************************************
   * Name: zkit_spiinitialize
   *
   * Description:
   *   Called to configure SPI chip select and card detect GPIO pins for the
   *   ZKIT-ARM-1769 Kit.
   *
   ************************************************************************************/
  
  void weak_function zkit_spiinitialize(void)
  {
    /* Configure the SPI-based microSD CS  and Card Detect (CD) GPIO */
  
    spi_dumpgpio("zkit_spiinitialize() Entry)");
  
    /* Configure card detect and chip select for the SD slot. */
  
    (void)lpc17_configgpio(ZKITARM_SD_CS);
    (void)lpc17_configgpio(ZKITARM_SD_CD);
  
    spi_dumpgpio("zkit_spiinitialize() Exit");
  }
  
  /************************************************************************************
   * Name:  lpc17_spiselect and lpc17_spistatus
   *
   * Description:
   *   The external functions, lpc17_spiselect and  lpc17_spistatus
   *   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 up_spiinitialize())
   *   are provided by common LPC17xx logic.  To use this common SPI logic on your
   *   board:
   *
   *   1. Provide logic in lpc17_boardinitialize() to configure SPI/SSP chip select
   *      pins.
   *   2. Provide lpc17_spiselect and  lpc17_spistatus 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 up_spiinitialize() in your low level application
   *      initialization logic
   *   4. The handle returned by up_spiinitialize() 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).
   *
   ************************************************************************************/
  
  void  lpc17_spiselect(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
  {
    spidbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
    spi_dumpgpio("lpc17_spiselect() Entry");
  
    if (devid == SPIDEV_MMCSD)
      {
        /* Assert/de-assert the CS pin to the card */
  
        (void)lpc17_gpiowrite(ZKITARM_SD_CS, !selected);
      }
  
    spi_dumpgpio("lpc17_spiselect() Exit");
  }
  
  uint8_t lpc17_spistatus(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
  {
    if (devid == SPIDEV_MMCSD)
      {
        /* Read the state of the card-detect bit */
  
        if (lpc17_gpioread(ZKITARM_SD_CD) == 0)
          {
            spidbg("Returning SPI_STATUS_PRESENT\n");
            return SPI_STATUS_PRESENT;
          }
      }
  
    spidbg("Returning zero\n");
    return 0;
  }
  
  #ifdef CONFIG_SPI_CMDDATA
  /******************************************************************************
   * Name:  lpc17_spicmddata
   *
   * Description: Dummy Function
   *
   ******************************************************************************/
  
  int lpc17_spicmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd)
  {
    return OK;
  }
  
  #endif /* CONFIG_SPI_CMDDATA */
  #endif /* CONFIG_LPC17_SPI */
  