288 lines
8.7 KiB
C
288 lines
8.7 KiB
C
/****************************************************************************
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* configs/sam3u-ek/src/up_mmcsd.c
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*
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* Copyright (C) 2010, 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdbool.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/mmcsd.h>
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#include <nuttx/spi/spi.h>
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#include <nuttx/spi/spi_bitbang.h>
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#include "up_arch.h"
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#include "sam_gpio.h"
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#include "chip/sam3u_pio.h"
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#include "arduino-due.h"
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/* In order to use the SD card on the ITEAD shield, you must enable the SPI bit-bang
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* driver as well as support for SPI-based MMC/SD cards.
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*/
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#if defined(CONFIG_ARDUINO_ITHEAD_TFT) && defined(CONFIG_SPI_BITBANG) && \
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defined(CONFIG_MMCSD_SPI)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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#ifdef CONFIG_DISABLE_MOUNTPOINT
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# error Mountpoints are disabled (CONFIG_DISABLE_MOUNTPOINT=y)
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#endif
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/* Definitions for include/nuttx/spi/spi_bitbang.c. */
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#define SPI_SETSCK putreg32(1 << 27, SAM_PIOB_SODR)
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#define SPI_CLRSCK putreg32(1 << 27, SAM_PIOB_CODR)
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#define SPI_SETMOSI putreg32(1 << 7, SAM_PIOD_SODR)
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#define SPI_CLRMOSI putreg32(1 << 7, SAM_PIOD_CODR)
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#define SPI_GETMISO ((getreg32(SAM_PIOD_PDSR) >> 8) & 1)
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#define SPI_SETCS putreg32(1 << 28, SAM_PIOA_SODR)
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#define SPI_CLRCS putreg32(1 << 28, SAM_PIOA_CODR)
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/* Only mode 0 */
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#undef SPI_BITBANG_DISABLEMODE0
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#define SPI_BITBANG_DISABLEMODE1 1
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#define SPI_BITBANG_DISABLEMODE2 1
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#define SPI_BITBANG_DISABLEMODE3 1
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/* Only 8-bit data width */
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#undef SPI_BITBANG_VARWIDTH
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/* Calibration value for timing loop */
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#define SPI_BITBAND_LOOPSPERMSEC CONFIG_BOARD_LOOPSPERMSEC
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/* SPI_PERBIT_NSEC is the minimum time to transfer one bit. This determines
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* the maximum frequency and is also used to calculate delays to achieve
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* other SPI frequencies.
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*/
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#define SPI_PERBIT_NSEC 100
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/* Misc definitions */
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#define SAM34_MMCSDSLOTNO 0 /* There is only one slot */
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static void spi_select(FAR struct spi_bitbang_s *priv, enum spi_dev_e devid,
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bool selected);
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static uint8_t spi_status(FAR struct spi_bitbang_s *priv, enum spi_dev_e devid);
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#ifdef CONFIG_SPI_CMDDATA
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static int spi_cmddata(FAR struct spi_bitbang_s *priv, enum spi_dev_e devid,
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bool cmd);
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Include the bit-band skeleton logic
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****************************************************************************/
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#include <nuttx/spi/spi_bitbang.c>
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/****************************************************************************
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* Name: spi_select
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*
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* Description:
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* Select or de-selected the SPI device specified by 'devid'
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*
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* Input Parameters:
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* priv - An instance of the bit-bang driver structure
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* devid - The device to select or de-select
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* selected - True:select false:de-select
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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static void spi_select(FAR struct spi_bitbang_s *priv, enum spi_dev_e devid,
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bool selected)
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{
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if (devid == SPIDEV_MMCSD)
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{
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if (selected)
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{
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SPI_CLRCS;
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}
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else
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{
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SPI_SETCS;
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}
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}
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}
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/****************************************************************************
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* Name: spi_status
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*
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* Description:
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* Return status of the SPI device specified by 'devid'
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*
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* Input Parameters:
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* priv - An instance of the bit-bang driver structure
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* devid - The device to select or de-select
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*
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* Returned Value:
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* An 8-bit, bit-encoded status byte
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*
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****************************************************************************/
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static uint8_t spi_status(FAR struct spi_bitbang_s *priv, enum spi_dev_e devid)
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{
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if (devid == SPIDEV_MMCSD)
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{
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return SPI_STATUS_PRESENT;
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}
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return 0;
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}
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/****************************************************************************
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* Name: spi_cmddata
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*
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* Description:
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* If there were was a CMD/DATA line, this function would manage it
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*
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* Input Parameters:
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* priv - An instance of the bit-bang driver structure
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* devid - The device to use
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* cmd - True=MCD false=DATA
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*
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* Returned Value:
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* OK
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*
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****************************************************************************/
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#ifdef CONFIG_SPI_CMDDATA
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static int spi_cmddata(FAR struct spi_bitbang_s *priv, enum spi_dev_e devid,
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bool cmd)
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{
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return OK;
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}
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#endif
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/****************************************************************************
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* Name: sam_mmcsd_spiinitialize
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*
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* Description:
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* Initialize the SPI bit-bang driver
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* A non-NULL reference to the SPI driver on success
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*
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****************************************************************************/
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static FAR struct spi_dev_s *sam_mmcsd_spiinitialize(void)
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{
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/* Initialize GPIOs */
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sam_configgpio(GPIO_SD_SCK);
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sam_configgpio(GPIO_SD_MISO);
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sam_configgpio(GPIO_SD_MOSI);
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sam_configgpio(GPIO_SD_CS);
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/* Create the SPI driver instance */
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return spi_create_bitbang(&g_spiops);
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sam_sdinitialize
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*
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* Description:
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* Initialize the SPI-based SD card.
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*
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*****************************************************************************/
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int sam_sdinitialize(int minor)
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{
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FAR struct spi_dev_s *spi;
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int ret;
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/* Get the SPI driver instance for the SD chip select */
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fvdbg("Initializing bit bang SPI for the MMC/SD slot\n");
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spi = sam_mmcsd_spiinitialize();
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if (!spi)
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{
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fdbg("Failed to bit bang SPI for the MMC/SD slot\n");
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return -ENODEV;
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}
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fvdbg("Successfully initialized bit bang SPI for the MMC/SD slot\n");
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/* Bind the SPI device for the chip select to the slot */
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fvdbg("Binding bit bang SPI device to MMC/SD slot %d\n",
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SAM34_MMCSDSLOTNO);
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ret = mmcsd_spislotinitialize(minor, SAM34_MMCSDSLOTNO, spi);
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if (ret < 0)
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{
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fdbg("Failed to bind bit bang SPI device to MMC/SD slot %d: %d\n",
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SAM34_MMCSDSLOTNO, ret);
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return ret;
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}
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fvdbg("Successfuly bound bit bang SPI device to MMC/SD slot %d\n",
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SAM34_MMCSDSLOTNO);
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return OK;
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}
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#endif /* CONFIG_ARDUINO_ITHEAD_TFT && CONFIG_SPI_BITBANG && CONFIG_MMC_SPI */
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