nuttx/configs/nucleo-l496zg/src/stm32_sdio.c
2017-09-26 06:23:15 -06:00

181 lines
5.5 KiB
C

/****************************************************************************
* config/nucleo-144/src/stm32_sdio.c
*
* Copyright (C) 2014, 2016-2017 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 <stdio.h>
#include <debug.h>
#include <errno.h>
#include <nuttx/sdio.h>
#include <nuttx/mmcsd.h>
#include "chip.h"
#include "nucleo-144.h"
#include "stm32l4_gpio.h"
#include "stm32l4_sdmmc.h"
#ifdef CONFIG_MMCSD
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* Card detections requires card support and a card detection GPIO */
#define HAVE_NCD 1
#if !defined(GPIO_SDMMC1_NCD)
# undef HAVE_NCD
#endif
/****************************************************************************
* Private Data
****************************************************************************/
static FAR struct sdio_dev_s *g_sdio_dev;
#ifdef HAVE_NCD
static bool g_sd_inserted = 0xff; /* Impossible value */
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: stm32_ncd_interrupt
*
* Description:
* Card detect interrupt handler.
*
****************************************************************************/
#ifdef HAVE_NCD
static int stm32l4_ncd_interrupt(int irq, FAR void *context)
{
bool present;
present = !stm32l4_gpioread(GPIO_SDMMC1_NCD);
if (g_sdio_dev && present != g_sd_inserted)
{
sdio_mediachange(g_sdio_dev, present);
g_sd_inserted = present;
}
return OK;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: stm32_sdio_initialize
*
* Description:
* Initialize SDIO-based MMC/SD card support
*
****************************************************************************/
int stm32l4_sdio_initialize(void)
{
int ret;
#ifdef HAVE_NCD
/* Card detect */
bool cd_status;
/* Configure the card detect GPIO */
stm32l4_configgpio(GPIO_SDMMC1_NCD);
/* Register an interrupt handler for the card detect pin */
(void)stm32l4_gpiosetevent(GPIO_SDMMC1_NCD, true, true, true,
stm32l4_ncd_interrupt, NULL);
#endif
/* Mount the SDIO-based MMC/SD block driver */
/* First, get an instance of the SDIO interface */
finfo("Initializing SDIO slot %d\n", SDIO_SLOTNO);
g_sdio_dev = sdio_initialize(SDIO_SLOTNO);
if (!g_sdio_dev)
{
ferr("ERROR: Failed to initialize SDIO slot %d\n", SDIO_SLOTNO);
return -ENODEV;
}
/* Now bind the SDIO interface to the MMC/SD driver */
finfo("Bind SDIO to the MMC/SD driver, minor=%d\n", SDIO_MINOR);
ret = mmcsd_slotinitialize(SDIO_MINOR, g_sdio_dev);
if (ret != OK)
{
ferr("ERROR: Failed to bind SDIO to the MMC/SD driver: %d\n", ret);
return ret;
}
finfo("Successfully bound SDIO to the MMC/SD driver\n");
#ifdef HAVE_NCD
/* Use SD card detect pin to check if a card is g_sd_inserted */
cd_status = !stm32l4_gpioread(GPIO_SDMMC1_NCD);
finfo("Card detect : %d\n", cd_status);
sdio_mediachange(g_sdio_dev, cd_status);
#else
/* Assume that the SD card is inserted. What choice do we have? */
sdio_mediachange(g_sdio_dev, true);
#endif
return OK;
}
#endif /* HAVE_SDIO */