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nuttx/drivers/mmcsd/mmcsd_sdio.c
patacongo 1c036b928f Need to use poll-waiting 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2254 42af7a65-404d-4744-a932-0658087f49c3
2009-11-13 23:47:36 +00:00

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/****************************************************************************
* drivers/mmcsd/mmcsd_sdio.c
*
* Copyright (C) 2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 <sys/types.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <debug.h>
#include <errno.h>
#include <nuttx/fs.h>
#include <nuttx/ioctl.h>
#include <nuttx/clock.h>
#include <nuttx/arch.h>
#include <nuttx/rwbuffer.h>
#include <nuttx/sdio.h>
#include <nuttx/mmcsd.h>
#include "mmcsd_internal.h"
#include "mmcsd_sdio.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* The maximum number of references on the driver (because a ubyte is used.
* Use a larger type if more references are needed.
*/
#define MAX_CREFS 0xff
/* Timing */
#define MMCSD_POWERUP_DELAY 250 /* 74 clock cycles @ 400KHz = 185uS */
#define MMCSD_IDLE_DELAY 50 /* Short delay to allow change to IDLE state */
#define IS_EMPTY(priv) (priv->type == MMCSD_CARDTYPE_UNKNOWN)
/* Transfer mode */
#define MMCSDMODE_POLLED 0
#define MMCSDMODE_INTERRUPT 1
#define MMCSDMODE_DMA 2
/****************************************************************************
* Private Types
****************************************************************************/
/* This structure is contains the unique state of the MMC/SD block driver */
struct mmcsd_state_s
{
struct sdio_dev_s *dev; /* The SDIO device bound to this instance */
ubyte crefs; /* Open references on the driver */
/* Status flags */
ubyte probed:1; /* TRUE: mmcsd_probe() discovered a card */
ubyte widebus:1; /* TRUE: Wide 4-bit bus selected */
ubyte mediachanged:1; /* TRUE: Media changed since last check */
ubyte wrprotect:1; /* TRUE: Media is write protected */
ubyte selected:1; /* TRUE: card is selected */
#ifdef CONFIG_SDIO_DMA
ubyte dma:1; /* TRUE: hardware supports DMA */
#endif
ubyte type; /* Card type (See MMCSD_CARDTYPE_* definitions) */
ubyte mode; /* (See MMCSDMODE_* definitions) */
uint16 selblocklen; /* The currently selected block length */
uint16 rca; /* Relative Card Address (RCS) register */
/* Memory card geometry (extracted from the CSD) */
uint16 rdblocklen; /* Read block length (== block size) */
uint16 wrblocklen; /* Write block length */
size_t nblocks; /* Number of blocks */
size_t capacity; /* Total capacity of volume */
/* Read-ahead and write buffering support */
#if defined(CONFIG_FS_WRITEBUFFER) || defined(CONFIG_FS_READAHEAD)
struct rwbuffer_s rwbuffer;
#endif
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Command/response helpers *************************************************/
static int mmcsd_sendcmdpoll(struct mmcsd_state_s *priv, uint32 cmd, uint32 arg);
/* Transfer helpers *********************************************************/
static ssize_t mmcsd_doread(FAR void *dev, FAR ubyte *buffer,
off_t startblock, size_t nblocks);
static ssize_t mmcsd_dowrite(FAR void *dev, FAR const ubyte *buffer,
off_t startblock, size_t nblocks);
/* Block driver methods *****************************************************/
static int mmcsd_open(FAR struct inode *inode);
static int mmcsd_close(FAR struct inode *inode);
static ssize_t mmcsd_read(FAR struct inode *inode, unsigned char *buffer,
size_t start_sector, unsigned int nsectors);
#ifdef CONFIG_FS_WRITABLE
static ssize_t mmcsd_write(FAR struct inode *inode, const unsigned char *buffer,
size_t start_sector, unsigned int nsectors);
#endif
static int mmcsd_geometry(FAR struct inode *inode,
struct geometry *geometry);
static int mmcsd_ioctl(FAR struct inode *inode, int cmd,
unsigned long arg);
/* Initialization/uninitialization/reset ************************************/
static inline int
mmcsd_mmcinitialize(struct mmcsd_state_s *priv);
static inline int
mmcsd_sdinitialize(struct mmcsd_state_s *priv);
static inline int
mmcsd_cardidentify(struct mmcsd_state_s *priv);
static int mmcsd_probe(struct mmcsd_state_s *priv);
static int mmcsd_removed(struct mmcsd_state_s *priv);
static int mmcsd_hwinitialize(struct mmcsd_state_s *priv);
static inline void
mmcsd_hwuninitialize(struct mmcsd_state_s *priv);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct block_operations g_bops =
{
mmcsd_open, /* open */
mmcsd_close, /* close */
mmcsd_read, /* read */
#ifdef CONFIG_FS_WRITABLE
mmcsd_write, /* write */
#else
NULL, /* write */
#endif
mmcsd_geometry, /* geometry */
mmcsd_ioctl /* ioctl */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Command/Response Helpers
****************************************************************************/
/****************************************************************************
* Name: mmcsd_sendcmdpoll
*
* Description:
* send a command and poll-wait for the response.
*
****************************************************************************/
static int mmcsd_sendcmdpoll(struct mmcsd_state_s *priv, uint32 cmd, uint32 arg)
{
int ret;
/* Send the command */
SDIO_SENDCMD(priv->dev, cmd, arg);
/* Then poll-wait until the response is available */
ret = SDIO_WAITRESPONSE(priv->dev, cmd);
if (ret != OK)
{
fdbg("ERROR: Wait for response to cmd=%08x failed: %d\n", cmd, ret);
}
return ret;
}
/****************************************************************************
* Transfer Helpers
****************************************************************************/
/****************************************************************************
* Name: mmcsd_doread
*
* Description:
* Read the specified numer of sectors from the physical device.
*
****************************************************************************/
static ssize_t mmcsd_doread(FAR void *dev, FAR ubyte *buffer,
off_t startblock, size_t nblocks)
{
struct mmcsd_state_s *priv = (struct mmcsd_state_s *)dev;
#ifdef CONFIG_CPP_HAVE_WARNING
# warning "Not implemented"
#endif
return -ENOSYS;
}
/****************************************************************************
* Name: mmcsd_dowrite
*
* Description: Write the specified number of sectors
*
****************************************************************************/
#ifdef CONFIG_FS_WRITABLE
static ssize_t mmcsd_dowrite(FAR void *dev, FAR const ubyte *buffer,
off_t startblock, size_t nblocks)
{
struct mmcsd_state_s *priv = (struct mmcsd_state_s *)dev;
#ifdef CONFIG_CPP_HAVE_WARNING
# warning "Not implemented"
#endif
return -ENOSYS;
}
#endif
/****************************************************************************
* Block Driver Methods
****************************************************************************/
/****************************************************************************
* Name: mmcsd_open
*
* Description: Open the block device
*
****************************************************************************/
static int mmcsd_open(FAR struct inode *inode)
{
struct mmcsd_state_s *priv;
fvdbg("Entry\n");
DEBUGASSERT(inode && inode->i_private);
priv = (struct mmcsd_state_s *)inode->i_private;
/* Just increment the reference count on the driver */
DEBUGASSERT(priv->crefs < MAX_CREFS);
priv->crefs++;
return OK;
}
/****************************************************************************
* Name: mmcsd_close
*
* Description: close the block device
*
****************************************************************************/
static int mmcsd_close(FAR struct inode *inode)
{
struct mmcsd_state_s *priv;
fvdbg("Entry\n");
DEBUGASSERT(inode && inode->i_private);
priv = (struct mmcsd_state_s *)inode->i_private;
/* Decrement the reference count on the block driver */
DEBUGASSERT(priv->crefs > 0);
priv->crefs--;
return OK;
}
/****************************************************************************
* Name: mmcsd_read
*
* Description:
* Read the specified numer of sectors from the read-ahead buffer or from
* the physical device.
*
****************************************************************************/
static ssize_t mmcsd_read(FAR struct inode *inode, unsigned char *buffer,
size_t start_sector, unsigned int nsectors)
{
struct mmcsd_state_s *priv;
fvdbg("sector: %d nsectors: %d sectorsize: %d\n");
DEBUGASSERT(inode && inode->i_private);
priv = (struct mmcsd_state_s *)inode->i_private;
#ifdef CONFIG_FS_READAHEAD
return rwb_read(&priv->rwbuffer, start_sector, nsectors, buffer);
#else
return mmcsd_doread(priv, buffer, start_sector, nsectors);
#endif
}
/****************************************************************************
* Name: mmcsd_write
*
* Description:
* Write the specified number of sectors to the write buffer or to the
* physical device.
*
****************************************************************************/
#ifdef CONFIG_FS_WRITABLE
static ssize_t mmcsd_write(FAR struct inode *inode, const unsigned char *buffer,
size_t start_sector, unsigned int nsectors)
{
struct mmcsd_state_s *priv;
fvdbg("sector: %d nsectors: %d sectorsize: %d\n");
DEBUGASSERT(inode && inode->i_private);
priv = (struct mmcsd_state_s *)inode->i_private;
#ifdef CONFIG_FS_WRITEBUFFER
return rwb_write(&priv->rwbuffer, start_sector, nsectors, buffer);
#else
return mmcsd_dowrite(priv, buffer, start_sector, nsectors);
#endif
}
#endif
/****************************************************************************
* Name: mmcsd_geometry
*
* Description: Return device geometry
*
****************************************************************************/
static int mmcsd_geometry(FAR struct inode *inode, struct geometry *geometry)
{
struct mmcsd_state_s *priv;
int ret = -EINVAL;
fvdbg("Entry\n");
DEBUGASSERT(inode && inode->i_private);
if (geometry)
{
/* Is there a (supported) card inserted in the slot? */
priv = (struct mmcsd_state_s *)inode->i_private;
if (IS_EMPTY(priv))
{
/* No.. return ENODEV */
fvdbg("IS_EMPTY\n");
ret = -ENODEV;
}
else
{
/* Yes.. return the geometry of the card */
geometry->geo_available = TRUE;
geometry->geo_mediachanged = priv->mediachanged;
#ifdef CONFIG_FS_WRITABLE
geometry->geo_writeenabled = !priv->wrprotect;
#else
geometry->geo_writeenabled = FALSE;
#endif
geometry->geo_nsectors = priv->nblocks;
geometry->geo_sectorsize = priv->rdblocklen;
fvdbg("available: TRUE mediachanged: %s writeenabled: %s\n",
geometry->geo_mediachanged ? "TRUE" : "FALSE",
geometry->geo_writeenabled ? "TRUE" : "FALSE");
fvdbg("nsectors: %ld sectorsize: %d\n",
(long)geometry->geo_nsectors, geometry->geo_sectorsize);
priv->mediachanged = FALSE;
ret = OK;
}
}
return ret;
}
/****************************************************************************
* Name: mmcsd_ioctl
*
* Description: Return device geometry
*
****************************************************************************/
static int mmcsd_ioctl(FAR struct inode *inode, int cmd, unsigned long arg)
{
struct mmcsd_state_s *priv;
int ret;
fvdbg("Entry\n");
DEBUGASSERT(inode && inode->i_private);
priv = (struct mmcsd_state_s *)inode->i_private;
/* Process the IOCTL by command */
switch (cmd)
{
case BIOC_PROBE: /* Check for media in the slot */
{
fvdbg("BIOC_PROBE\n");
/* Probe the MMC/SD slot for media */
ret = mmcsd_probe(priv);
if (ret != OK)
{
fdbg("ERROR: mmcsd_probe failed: %d\n", ret);
}
}
break;
case BIOC_EJECT: /* Media has been removed from the slot */
{
fvdbg("BIOC_EJECT\n");
/* Process the removal of the card */
ret = mmcsd_removed(priv);
if (ret != OK)
{
fdbg("ERROR: mmcsd_removed failed: %d\n", ret);
}
}
break;
default:
ret = -ENOTTY;
break;
}
return ret;
}
/****************************************************************************
* Initialization/uninitialization/reset
****************************************************************************/
/****************************************************************************
* Name: mmcsd_mmcinitialize
*
* Description:
* We believe that there is an MMC card in the slot. Attempt to initialize
* and configure the MMC card. This is called only from mmcsd_probe().
*
****************************************************************************/
static inline int mmcsd_mmcinitialize(struct mmcsd_state_s *priv)
{
return -ENOSYS;
}
/****************************************************************************
* Name: mmcsd_sdinitialize
*
* Description:
* We believe that there is an SD card in the slot. Attempt to initialize
* and configure the SD card. This is called only from mmcsd_probe().
*
****************************************************************************/
static inline int mmcsd_sdinitialize(struct mmcsd_state_s *priv)
{
return -ENOSYS;
}
/****************************************************************************
* Name: mmcsd_cardidentify
*
* Description:
* We believe that there is media in the slot. Attempt to initialize and
* configure the card. This is called only from mmcsd_probe().
*
****************************************************************************/
static inline int mmcsd_cardidentify(struct mmcsd_state_s *priv)
{
uint32 response;
uint32 start;
uint32 elapsed;
uint32 state;
uint32 sdcapacity = MMCD_ACMD41_STDCAPACITY;
boolean cardbusy;
int ret;
/* Assume failure to identify the card */
priv->type = MMCSD_CARDTYPE_UNKNOWN;
priv->mode = MMCSDMODE_POLLED;
/* Check if there is a card present in the slot. This is normally a matter is
* of GPIO sensing.
*/
if (SDIO_PRESENT(priv->dev))
{
fvdbg("No card present\n");
return -ENODEV;
}
/* Initialize device state structure */
priv->type = MMCSD_CARDTYPE_SDV1;
priv->mode = MMCSDMODE_POLLED;
/* Set ID mode clocking (<400KHz) */
SDIO_CLOCK(priv->dev, CLOCK_IDMODE);
/* After power up at least 74 clock cycles are required prior to starting bus
* communication
*/
up_udelay(MMCSD_POWERUP_DELAY);
/* Then send CMD0 (twice just to be sure) */
mmcsd_sendcmdpoll(priv, MMCSD_CMD0, 0);
mmcsd_sendcmdpoll(priv, MMCSD_CMD0, 0);
up_udelay(MMCSD_IDLE_DELAY);
/* Check for SDHC Version 2.x. Send CMD8 to verify SD card interface
* operating condition. CMD 8 is reserved on SD version 1.0 and MMC.
*
* CMD8 Argument:
* [31:12]: Reserved (shall be set to '0')
* [11:8]: Supply Voltage (VHS) 0x1 (Range: 2.7-3.6 V)
* [7:0]: Check Pattern (recommended 0xaa)
* CMD8 Response: R7
*/
mmcsd_sendcmdpoll(priv, SD_CMD8, MMCSD_CMD8CHECKPATTERN|MMCSD_CMD8VOLTAGE_27);
ret = SDIO_RECVR7(priv->dev, SD_CMD8, &response);
if (ret == OK)
{
/* CMD8 succeeded this is probably a SDHC card. Verify the operating
* voltage and that the check pattern was correctly echoed
*/
if (((response & MMCSD_R7VOLTAGE_MASK) == MMCSD_R7VOLTAGE_27) &&
((response & MMCSD_R7ECHO_MASK) == MMCSD_R7CHECKPATTERN))
{
fvdbg("SD V2.x card\n");
priv->type = MMCSD_CARDTYPE_SDV2;
sdcapacity = MMCD_ACMD41_HIGHCAPACITY;
}
else
{
fdbg("ERROR: R7: %08x\n", r7);
return -EIO;
}
}
/* At this point, type is either UNKNOWN or SDV2. Try sending
* CMD55 and (maybe) ACMD41 for up to 1 second or until the card
* exits the IDLE state. CMD55 is supported by SD V1.x and SD V2.x,
* but not MMC
*/
start = g_system_timer;
elapsed = 0;
do
{
/* Send CMD55 */
mmcsd_sendcmdpoll(priv, SD_CMD55, 0);
ret = SDIO_RECVR1(priv->dev, SD_CMD55, &response);
if (ret != OK)
{
/* If the error is a timeout, then it is an MMC card */
if (ret == -ETIMEDOUT)
{
fvdbg("ERROR: CMD55 timeout, assuming MMC card\n");
priv->type = MMCSD_CARDTYPE_MMC;
break;
}
else
{
fdbg("ERROR: CMD55 RECVR1: %d\n", ret);
return -EIO;
}
}
else
{
/* CMD55 succeeded. CMD55 is supported by SD V1.x and SD V2.x,
* but not MMC. If we did not previoulsy determine that this is
* an SD V2.x (via CMD8), then this must be SD V1.x
*/
if (priv->type == MMCSD_CARDTYPE_UNKNOWN)
{
fvdbg("SD V1.x card\n");
priv->type = MMCSD_CARDTYPE_SDV1;
}
/* Save the state from CMD55 R1 response */
state = response & MMCSD_R1_STATE_MASK;
fvdbg("CMD55 R1: %08x\n", response);
/* Send ACMD41 */
mmcsd_sendcmdpoll(priv, SD_ACMD41, MMCD_ACMD41_VOLTAGEWINDOW|sdcapacity);
ret = SDIO_RECVR3(priv->dev, SD_CMD55, &response);
if (ret != OK)
{
fdbg("ERROR: ACMD41 RECVR1: %d\n", ret);
return -EIO;
}
else
{
/* Check if the card is busy */
cardbusy = ((response >> 31) == 1);
if (!cardbusy)
{
/* Check if this is a SD V2.x card that supports block addressing */
if ((response & MMCD_R3_HIGHCAPACITY) != 0)
{
fvdbg("SD V2.x card with block addressing\n");
DEBUGASSERT(priv->type == MMCSD_CARDTYPE_SDV2);
priv->type |= MMCSD_CARDTYPE_BLOCK;
}
}
}
}
elapsed = g_system_timer - start;
}
while (elapsed < TICK_PER_SEC && (ret != OK || state != MMCSD_R1_STATE_IDLE || cardbusy));
/* We get here when the above loop completes, either (1) because this is
* an MMC card, (2) we could not communicate properly with the card due to
* errors (and the loop times out), or (3) it is an SD card that has successfully
* transitioned to the IDLE state.
*/
if (elapsed >= TICK_PER_SEC || priv->type == MMCSD_CARDTYPE_UNKNOWN)
{
fdbg("ERROR: Failed to identify card\n");
return -EIO;
}
return OK;
}
/****************************************************************************
* Name: mmcsd_probe
*
* Description:
* Check for media inserted in a slot. Called (1) during initialization to
* see if there was a card in the slot at power up, (2) when/if a media
* insertion event occurs, or (3) if the BIOC_PROBE ioctl command is
* received.
*
****************************************************************************/
static int mmcsd_probe(struct mmcsd_state_s *priv)
{
int ret;
fvdbg("type=%d probed=%d\n", priv->type, priv->probed);
/* If we have reliable card detection events and if we have
* already probed the card, then we don't need to do anything
* else
*/
#ifdef CONFIG_MMCSD_HAVECARDDETECT
if (priv->probed && SDIO_PRESENT(priv->dev))
{
return OK;
}
#endif
/* Otherwise, we are going to probe the card. There are lots of
* possibilities here: We may think that there is a card in the slot,
* or not. There may be a card in the slot, or not. If there is
* card in the slot, perhaps it is a different card than we one we
* think is there? The safest thing to do is to process the card
* removal first and start from known place.
*/
mmcsd_removed(priv);
/* Now.. is there a card in the slot? */
if (SDIO_PRESENT(priv->dev))
{
/* Yes.. probe it. First, what kind of card was inserted? */
ret = mmcsd_cardidentify(priv);
if (ret != OK)
{
fdbg("ERROR: Failed to initialize card: %d\n");
SDIO_EVENTENABLE(priv->dev, SDIOEVENT_INSERTED);
}
else
{
/* Then initialize the driver according to the identified card type */
switch (priv->type)
{
case MMCSD_CARDTYPE_MMC: /* MMC card */
ret = mmcsd_mmcinitialize(priv);
case MMCSD_CARDTYPE_SDV1: /* Bit 1: SD version 1.x */
case MMCSD_CARDTYPE_SDV2: /* SD version 2.x with byte addressing */
case MMCSD_CARDTYPE_SDV2|MMCSD_CARDTYPE_BLOCK: /* SD version 2.x with block addressing */
ret = mmcsd_sdinitialize(priv);
case MMCSD_CARDTYPE_UNKNOWN: /* Unknown card type */
default:
fdbg("ERROR: Internal confusion: %d\n", priv->type);
ret = -EPERM;
};
/* Was the card configured successfully? */
if (ret == OK)
{
/* Yes... */
fvdbg("Capacity: %d Kbytes\n", priv->capacity / 1024);
priv->mediachanged = TRUE;
/* Set up to receive asynchronous, media removal events */
SDIO_EVENTENABLE(priv->dev, SDIOEVENT_EJECTED);
}
}
/* In any event, we have probed this card */
priv->probed = TRUE;
}
else
{
/* There is no card in the slot */
fvdbg("No card\n");
SDIO_EVENTENABLE(priv->dev, SDIOEVENT_INSERTED);
}
return ret;
}
/****************************************************************************
* Name: mmcsd_removed
*
* Description:
* Disable support for media in the slot. Called (1) when/if a media
* removal event occurs, or (2) if the BIOC_EJECT ioctl command is
* received.
*
****************************************************************************/
static int mmcsd_removed(struct mmcsd_state_s *priv)
{
fvdbg("type: %d present: %d\n", priv->type, SDIO_PRESENT(priv->dev));
/* Forget the card geometry, pretend the slot is empty (it might not
* be), and that the card has never been initialized.
*/
priv->capacity = 0; /* Capacity=0 sometimes means no media */
priv->rdblocklen = 0;
priv->wrblocklen = 0;
priv->mediachanged = FALSE;
priv->type = MMCSD_CARDTYPE_UNKNOWN;
priv->probed = FALSE;
priv->selected = FALSE;
priv->rca = 0;
priv->selblocklen = 0;
/* Go back to the default 1-bit data bus. */
SDIO_WIDEBUS(priv->dev, FALSE);
priv->widebus = FALSE;
/* Disable clocking to the card */
(void)SDIO_CLOCK(priv->dev, CLOCK_SDIO_DISABLED);
/* Enable logic to detect if a card is re-inserted */
SDIO_EVENTENABLE(priv->dev, SDIOEVENT_INSERTED);
return OK;
}
/****************************************************************************
* Name: mmcsd_hwinitialize
*
* Description:
* One-time hardware initialization
*
****************************************************************************/
static int mmcsd_hwinitialize(struct mmcsd_state_s *priv)
{
#ifdef CONFIG_CPP_HAVE_WARNING
# warning "Not implemented"
#endif
return -ENODEV;
}
/****************************************************************************
* Name: mmcsd_hwinitialize
*
* Description:
* Restore the MMC/SD slot to the uninitialized state
*
****************************************************************************/
static inline void mmcsd_hwuninitialize(struct mmcsd_state_s *priv)
{
if (priv)
{
mmcsd_removed(priv);
SDIO_RESET(priv->dev);
free(priv);
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: mmcsd_slotinitialize
*
* Description:
* Initialize one slot for operation using the MMC/SD interface
*
* Input Parameters:
* minor - The MMC/SD minor device number. The MMC/SD device will be
* registered as /dev/mmcsdN where N is the minor number
* slotno - The slot number to use. This is only meaningful for architectures
* that support multiple MMC/SD slots. This value must be in the range
* {0, ..., CONFIG_MMCSD_NSLOTS}.
* dev - And instance of an MMC/SD interface. The MMC/SD hardware should
* be initialized and ready to use.
*
****************************************************************************/
int mmcsd_slotinitialize(int minor, int slotno, FAR struct sdio_dev_s *dev)
{
struct mmcsd_state_s *priv;
char devname[16];
int ret = -ENOMEM;
fvdbg("minor: %d slotno: %d\n", minor, slotno);
/* Sanity check */
#ifdef CONFIG_DEBUG
if ((unsigned)slotno >= CONFIG_MMCSD_NSLOTS || minor < 0 || minor > 255 || !dev)
{
return -EINVAL;
}
#endif
/* Allocate a MMC/SD state structure */
priv = (struct mmcsd_state_s *)malloc(sizeof(struct mmcsd_state_s));
if (priv)
{
/* Initialize the MMC/SD state structure */
memset(priv, 0, sizeof(struct mmcsd_state_s));
/* Bind the MMCSD driver to the MMCSD state structure */
priv->dev = dev;
/* Initialize the hardware associated with the slot */
ret = mmcsd_hwinitialize(priv);
/* Was the slot initialized successfully? */
if (ret != OK)
{
/* No... But the error ENODEV is returned if hardware initialization
* succeeded but no card is inserted in the slot. In this case, the
* no error occurred, but the driver is still not ready.
*/
if (ret == -ENODEV)
{
fdbg("MMC/SD slot %d is empty\n", slotno);
}
else
{
fdbg("ERROR: Failed to initialize MMC/SD slot %d: %d\n",
slotno, -ret);
goto errout_with_alloc;
}
}
/* Initialize buffering */
#if defined(CONFIG_FS_WRITEBUFFER) || defined(CONFIG_FS_READAHEAD)
ret = rwb_initialize(&priv->rwbuffer);
if (ret < 0)
{
fdbg("ERROR: Buffer setup failed: %d\n", -ret);
goto errout_with_hwinit;
}
#endif
/* Create a MMCSD device name */
snprintf(devname, 16, "/dev/mmcsd%d", minor);
/* Inode private data is a reference to the MMCSD state structure */
ret = register_blockdriver(devname, &g_bops, 0, priv);
if (ret < 0)
{
fdbg("ERROR: register_blockdriver failed: %d\n", -ret);
goto errout_with_buffers;
}
}
return OK;
errout_with_buffers:
#if defined(CONFIG_FS_WRITEBUFFER) || defined(CONFIG_FS_READAHEAD)
rwb_uninitialize(&priv->rwbuffer);
#endif
errout_with_hwinit:
mmcsd_hwuninitialize(priv);
errout_with_alloc:
free(priv);
return ret;
}
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