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/****************************************************************************
* configs/sam3u-ek/src/up_mmcsd.c
*
* Copyright (C) 2010, 2013 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 <errno.h>
#include <debug.h>
#include <nuttx/mmcsd.h>
#include <nuttx/spi/spi.h>
#include <nuttx/spi/spi_bitbang.h>
#include "up_arch.h"
#include "sam_gpio.h"
#include "chip/sam3u_pio.h"
#include "arduino-due.h"
/* In order to use the SD card on the ITEAD shield, you must enable the SPI bit-bang
* driver as well as support for SPI-based MMC/SD cards.
*/
#if defined(CONFIG_ARDUINO_ITHEAD_TFT) && defined(CONFIG_SPI_BITBANG) && \
defined(CONFIG_MMCSD_SPI)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
#ifdef CONFIG_DISABLE_MOUNTPOINT
# error Mountpoints are disabled (CONFIG_DISABLE_MOUNTPOINT=y)
#endif
/* Definitions for include/nuttx/spi/spi_bitbang.c. */
#define SPI_SETSCK putreg32(1 << 27, SAM_PIOB_SODR)
#define SPI_CLRSCK putreg32(1 << 27, SAM_PIOB_CODR)
#define SPI_SETMOSI putreg32(1 << 7, SAM_PIOD_SODR)
#define SPI_CLRMOSI putreg32(1 << 7, SAM_PIOD_CODR)
#define SPI_GETMISO ((getreg32(SAM_PIOD_PDSR) >> 8) & 1)
/* Only mode 0 */
#undef SPI_BITBANG_DISABLEMODE0
#define SPI_BITBANG_DISABLEMODE1 1
#define SPI_BITBANG_DISABLEMODE2 1
#define SPI_BITBANG_DISABLEMODE3 1
/* Only 8-bit data width */
#undef SPI_BITBANG_VARWIDTH
/* Calibration value for timing loop */
#define SPI_BITBAND_LOOPSPERMSEC CONFIG_BOARD_LOOPSPERMSEC
/* SPI_PERBIT_NSEC is the minimum time to transfer one bit. This determines
* the maximum frequency and is also used to calculate delays to achieve
* other SPI frequencies.
*/
#define SPI_PERBIT_NSEC 100
/* Misc definitions */
#define SAM34_MMCSDSLOTNO 0 /* There is only one slot */
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static void spi_select(FAR struct spi_bitbang_s *priv, enum spi_dev_e devid,
bool selected);
static uint8_t spi_status(FAR struct spi_bitbang_s *priv, enum spi_dev_e devid);
#ifdef CONFIG_SPI_CMDDATA
static int spi_cmddata(FAR struct spi_bitbang_s *priv, enum spi_dev_e devid,
bool cmd);
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Include the bit-band skeleton logic
****************************************************************************/
#include <nuttx/spi/spi_bitbang.c>
/****************************************************************************
* Name: spi_select
*
* Description:
* Select or de-selected the SPI device specified by 'devid'
*
* Input Parameters:
* priv - An instance of the bit-bang driver structure
* devid - The device to select or de-select
* selected - True:select false:de-select
*
* Returned Value:
* None
*
****************************************************************************/
static void spi_select(FAR struct spi_bitbang_s *priv, enum spi_dev_e devid,
bool selected)
{
# warning Still need CS GPIO pin
}
/****************************************************************************
* Name: spi_status
*
* Description:
* Return status of the SPI device specified by 'devid'
*
* Input Parameters:
* priv - An instance of the bit-bang driver structure
* devid - The device to select or de-select
*
* Returned Value:
* An 8-bit, bit-encoded status byte
*
****************************************************************************/
static uint8_t spi_status(FAR struct spi_bitbang_s *priv, enum spi_dev_e devid)
{
if (devid == SPIDEV_MMCSD)
{
return SPI_STATUS_PRESENT;
}
return 0;
}
/****************************************************************************
* Name: spi_cmddata
*
* Description:
* If there were was a CMD/DATA line, this function would manage it
*
* Input Parameters:
* priv - An instance of the bit-bang driver structure
* devid - The device to use
* cmd - True=MCD false=DATA
*
* Returned Value:
* OK
*
****************************************************************************/
#ifdef CONFIG_SPI_CMDDATA
static int spi_cmddata(FAR struct spi_bitbang_s *priv, enum spi_dev_e devid,
bool cmd)
{
return OK;
}
#endif
/****************************************************************************
* Name: sam_mmcsd_spiinitialize
*
* Description:
* Initialize the SPI bit-bang driver
*
* Input Parameters:
* None
*
* Returned Value:
* A non-NULL reference to the SPI driver on success
*
****************************************************************************/
static FAR struct spi_dev_s *sam_mmcsd_spiinitialize(void)
{
/* Initialize GPIOs */
sam_configgpio(GPIO_SD_SCK);
sam_configgpio(GPIO_SD_MISO);
sam_configgpio(GPIO_SD_MOSI);
// sam_configgpio(GPIO_SD_CS);
# warning Still need CS GPIO pin
/* Create the SPI driver instance */
return spi_create_bitbang(&g_spiops);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: sam_sdinitialize
*
* Description:
* Initialize the SPI-based SD card.
*
*****************************************************************************/
int sam_sdinitialize(int minor)
{
FAR struct spi_dev_s *spi;
int ret;
/* Get the SPI driver instance for the SD chip select */
fvdbg("Initializing bit bang SPI for the MMC/SD slot\n");
spi = sam_mmcsd_spiinitialize();
if (!spi)
{
fdbg("Failed to bit bang SPI for the MMC/SD slot\n");
return -ENODEV;
}
fvdbg("Successfully initialized bit bang SPI for the MMC/SD slot\n");
/* Bind the SPI device for the chip select to the slot */
fvdbg("Binding bit bang SPI device to MMC/SD slot %d\n",
SAM34_MMCSDSLOTNO);
ret = mmcsd_spislotinitialize(minor, SAM34_MMCSDSLOTNO, spi);
if (ret < 0)
{
fdbg("Failed to bind bit bang SPI device to MMC/SD slot %d: %d\n",
SAM34_MMCSDSLOTNO, ret);
return ret;
}
fvdbg("Successfuly bound bit bang SPI device to MMC/SD slot %d\n",
SAM34_MMCSDSLOTNO);
return OK;
}
#endif /* CONFIG_ARDUINO_ITHEAD_TFT && CONFIG_SPI_BITBANG && CONFIG_MMC_SPI */
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