274 lines
7.8 KiB
C
274 lines
7.8 KiB
C
/****************************************************************************
|
|
* boards/arm/sam34/arduino-due/src/sam_mmcsd.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 <errno.h>
|
|
#include <debug.h>
|
|
|
|
#include <nuttx/mmcsd.h>
|
|
#include <nuttx/spi/spi.h>
|
|
#include <nuttx/spi/spi_bitbang.h>
|
|
|
|
#include "arm_internal.h"
|
|
#include "sam_gpio.h"
|
|
#include "hardware/sam3u_pio.h"
|
|
|
|
#include "arduino-due.h"
|
|
|
|
/* Include the bit-band skeleton logic */
|
|
|
|
#include <nuttx/spi/spi_bitbang.c>
|
|
|
|
/* 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)
|
|
#define SPI_SETCS putreg32(1 << 28, SAM_PIOA_SODR)
|
|
#define SPI_CLRCS putreg32(1 << 28, SAM_PIOA_CODR)
|
|
|
|
/* 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_BITBANG_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(struct spi_bitbang_s *priv, uint32_t devid,
|
|
bool selected);
|
|
static uint8_t spi_status(struct spi_bitbang_s *priv, uint32_t devid);
|
|
#ifdef CONFIG_SPI_CMDDATA
|
|
static int spi_cmddata(struct spi_bitbang_s *priv, uint32_t devid,
|
|
bool cmd);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* 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(struct spi_bitbang_s *priv, uint32_t devid,
|
|
bool selected)
|
|
{
|
|
if (devid == SPIDEV_MMCSD(0))
|
|
{
|
|
if (selected)
|
|
{
|
|
SPI_CLRCS;
|
|
}
|
|
else
|
|
{
|
|
SPI_SETCS;
|
|
}
|
|
}
|
|
}
|
|
|
|
/****************************************************************************
|
|
* 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(struct spi_bitbang_s *priv, uint32_t devid)
|
|
{
|
|
if (devid == SPIDEV_MMCSD(0))
|
|
{
|
|
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(struct spi_bitbang_s *priv, uint32_t 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 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);
|
|
|
|
/* 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)
|
|
{
|
|
struct spi_dev_s *spi;
|
|
int ret;
|
|
|
|
/* Get the SPI driver instance for the SD chip select */
|
|
|
|
finfo("Initializing bit bang SPI for the MMC/SD slot\n");
|
|
|
|
spi = sam_mmcsd_spiinitialize();
|
|
if (!spi)
|
|
{
|
|
ferr("ERROR: Failed to bit bang SPI for the MMC/SD slot\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
finfo("Successfully initialized bit bang SPI for the MMC/SD slot\n");
|
|
|
|
/* Bind the SPI device for the chip select to the slot */
|
|
|
|
finfo("Binding bit bang SPI device to MMC/SD slot %d\n",
|
|
SAM34_MMCSDSLOTNO);
|
|
|
|
ret = mmcsd_spislotinitialize(minor, SAM34_MMCSDSLOTNO, spi);
|
|
if (ret < 0)
|
|
{
|
|
ferr("ERROR: Failed to bind bit bang SPI device"
|
|
" to MMC/SD slot %d: %d\n",
|
|
SAM34_MMCSDSLOTNO, ret);
|
|
return ret;
|
|
}
|
|
|
|
finfo("Successfully 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 */
|