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/****************************************************************************
* config/sama5d3x-ek/src/sam_at24.c
*
* Copyright (C) 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.
*
****************************************************************************/
/* AT24 Serial EEPROM
*
* A AT24C512 Serial EEPPROM was used for tested I2C. There are other I2C/TWI
* devices on-board, but the serial EEPROM is the simplest test.
*
* There is, however, no AT24 EEPROM on board the SAMA5D3x-EK: The Serial
* EEPROM was mounted on an external adaptor board and connected to the
* SAMA5D3x-EK thusly:
*
* - VCC -- VCC
* - GND -- GND
* - TWCK0(PA31) -- SCL
* - TWD0(PA30) -- SDA
*
* By default, PA30 and PA31 are SWJ-DP pins, it can be used as a pin for TWI
* peripheral in the end application.
*/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/mount.h>
#include <stdbool.h>
#include <stdio.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/i2c.h>
#include <nuttx/mtd/mtd.h>
#include <nuttx/fs/nxffs.h>
#include "sama5d3x-ek.h"
#ifdef HAVE_AT24
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: sam_at24_automount
*
* Description:
* Initialize and configure the AT24 serial EEPROM
*
****************************************************************************/
int sam_at24_automount(int minor)
{
FAR struct i2c_dev_s *i2c;
FAR struct mtd_dev_s *mtd;
static bool initialized = false;
int ret;
/* Have we already initialized? */
if (!initialized)
{
/* No.. Get the I2C bus driver */
fvdbg("Initialize TWI%d\n", AT24_BUS);
i2c = up_i2cinitialize(AT24_BUS);
if (!i2c)
{
fdbg("ERROR: Failed to initialize TWI%d\n", AT24_BUS);
return -ENODEV;
}
/* Now bind the I2C interface to the AT24 I2C EEPROM driver */
fvdbg("Bind the AT24 EEPROM driver to TWI%d\n", AT24_BUS);
mtd = at24c_initialize(i2c);
if (!mtd)
{
fdbg("ERROR: Failed to bind TWI%d to the AT24 EEPROM driver\n",
AT24_BUS);
return -ENODEV;
}
#if defined(CONFIG_SAMA5D3xEK_AT24_FTL)
/* And finally, use the FTL layer to wrap the MTD driver as a block driver */
fvdbg("Initialize the FTL layer to create /dev/mtdblock%d\n", AT24_MINOR);
ret = ftl_initialize(AT24_MINOR, mtd);
if (ret < 0)
{
fdbg("ERROR: Failed to initialize the FTL layer: %d\n", ret);
return ret;
}
#elif defined(CONFIG_SAMA5D3xEK_AT24_NXFFS)
/* Initialize to provide NXFFS on the MTD interface */
fvdbg("Initialize the NXFFS file system\n");
ret = nxffs_initialize(mtd);
if (ret < 0)
{
fdbg("ERROR: NXFFS initialization failed: %d\n", ret);
return ret;
}
/* Mount the file system at /mnt/at24 */
fvdbg("Mount the NXFFS file system at /dev/at24\n");
ret = mount(NULL, "/mnt/at24", "nxffs", 0, NULL);
if (ret < 0)
{
fdbg("ERROR: Failed to mount the NXFFS volume: %d\n", errno);
return ret;
}
#endif
/* Now we are initializeed */
initialized = true;
}
return OK;
}
#endif /* HAVE_AT24 */
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