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/****************************************************************************
* config/sam4s-xplained-pro/src/sam_hsmci.c
*
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
* Authors: Gregory Nutt <gnutt@nuttx.org>
* Bob Doiron
*
* 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 "sam_gpio.h"
#include "sam_hsmci.h"
#include "sam4s-xplained-pro.h"
#ifdef HAVE_HSMCI
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/* This structure holds static information unique to one HSMCI peripheral */
struct sam_hsmci_state_s
{
struct sdio_dev_s *hsmci; /* R/W device handle */
bool initialized; /* TRUE: HSMCI block driver is initialized */
bool inserted; /* TRUE: card is inserted */
};
/****************************************************************************
* Private Data
****************************************************************************/
/* HSCMI device state */
static struct sam_hsmci_state_s g_hsmci;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: sam_hsmci_cardetect_int
*
* Description:
* Card detect interrupt handler
*
* TODO: Any way to automatically moun/unmount filesystem based on card
* detect status? Yes... send a message or signal to an application.
*
****************************************************************************/
#ifdef CONFIG_MMCSD_HAVECARDDETECT
static int sam_hsmci_cardetect_int(int irq, void *regs)
{
bool inserted;
/* Get the state of the GPIO pin */
inserted = sam_cardinserted(0);
/* Has the card detect state changed? */
if (inserted != g_hsmci.inserted)
{
/* Yes... remember that new state and inform the HSMCI driver */
g_hsmci.inserted = inserted;
/* Report the new state to the SDIO driver */
sdio_mediachange(g_hsmci.hsmci, inserted);
}
return OK;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: sam_hsmci_initialize
*
* Description:
* Perform architecture specific initialization
*
****************************************************************************/
int sam_hsmci_initialize(void)
{
int ret;
fdbg("Initializing SDIO\n");
/* Have we already initialized? */
if (!g_hsmci.initialized)
{
/* Mount the SDIO-based MMC/SD block driver */
/* First, get an instance of the SDIO interface */
g_hsmci.hsmci = sdio_initialize(CONFIG_NSH_MMCSDSLOTNO);
if (!g_hsmci.hsmci)
{
fdbg("Failed to initialize SDIO\n");
return -ENODEV;
}
/* Now bind the SDIO interface to the MMC/SD driver */
ret = mmcsd_slotinitialize(CONFIG_NSH_MMCSDMINOR, g_hsmci.hsmci);
if (ret != OK)
{
fdbg("Failed to bind SDIO to the MMC/SD driver: %d\n", ret);
return ret;
}
#ifdef CONFIG_MMCSD_HAVECARDDETECT
/* Initialize card-detect GPIO. There is no write-protection GPIO. */
sam_configgpio(GPIO_MCI_CD);
/* Configure card detect interrupts */
sam_gpioirq(GPIO_MCI_CD);
(void)irq_attach(MCI_CD_IRQ, sam_hsmci_cardetect_int);
g_hsmci.inserted = sam_cardinserted(0);
#else
g_hsmci.inserted = true; /* An assumption? */
#endif
/* Then inform the HSMCI driver if there is or is not a card in the slot. */
sdio_mediachange(g_hsmci.hsmci, g_hsmci.inserted);
/* Now we are initialized */
g_hsmci.initialized = true;
/* Enable card detect interrupts */
#ifdef CONFIG_MMCSD_HAVECARDDETECT
sam_gpioirqenable(MCI_CD_IRQ);
#endif
}
return OK;
}
/****************************************************************************
* Name: sam_cardinserted
*
* Description:
* Check if a card is inserted into the selected HSMCI slot
*
****************************************************************************/
#ifdef CONFIG_MMCSD_HAVECARDDETECT
bool sam_cardinserted(int slotno)
{
bool removed;
/* Get the state of the GPIO pin */
removed = sam_gpioread(GPIO_MCI_CD);
fllvdbg("Slot %d inserted: %s\n", slotno, removed ? "NO" : "YES");
return !removed;
}
#endif
/****************************************************************************
* Name: sam_writeprotected
*
* Description:
* Check if a card is inserted into the selected HSMCI slot
*
****************************************************************************/
bool sam_writeprotected(int slotno)
{
/* There are no write protect pins */
return false;
}
#endif /* HAVE_HSMCI */
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