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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 <semaphore.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 (all in units of microseconds) */
#define MMCSD_POWERUP_DELAY 250 /* 74 clock cycles @ 400KHz = 185uS */
#define MMCSD_IDLE_DELAY (50*1000) /* Short delay to allow change to IDLE state */
#define MMCSD_DSR_DELAY (100*1000) /* Time to wait after setting DSR */
#define MMCSD_CLK_DELAY (500*1000) /* Delay after changing clock speeds */
/* Event delays (all in units of milliseconds) */
#define MMCSD_SCR_DATADELAY (100) /* Wait up to 100MS to get SCR */
#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 */
sem_t sem; /* Assures mutually exclusive access to the slot */
/* 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 */
ubyte dsrimp:1; /* TRUE: card supports CMD4/DSR setting (from CSD) */
#ifdef CONFIG_SDIO_DMA
ubyte dma:1; /* TRUE: hardware supports DMA */
#endif
ubyte mode:2; /* (See MMCSDMODE_* definitions) */
ubyte type:4; /* Card type (See MMCSD_CARDTYPE_* definitions) */
ubyte buswidth:4; /* Bus widthes supported (SD only) */
uint16 selblocklen; /* The currently selected block length */
uint16 rca; /* Relative Card Address (RCS) register */
/* Memory card geometry (extracted from the CSD) */
uint16 blocksize; /* Read block length (== block size) */
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
****************************************************************************/
/* Misc Helpers *************************************************************/
static void mmcsd_takesem(struct mmcsd_state_s *priv);
#define mmcsd_givesem(p) sem_post(&priv->sem);
/* Command/response helpers *************************************************/
static int mmcsd_sendcmdpoll(struct mmcsd_state_s *priv, uint32 cmd,
uint32 arg);
static int mmcsd_recvR1(struct mmcsd_state_s *priv, uint32 cmd);
static int mmcsd_getSCR(struct mmcsd_state_s *priv, uint32 scr[2]);
static void mmcsd_decodeCSD(struct mmcsd_state_s *priv, uint32 csd[4]);
#if defined(CONFIG_DEBUG) && defined (CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_FS)
static void mmcsd_decodeCID(struct mmcsd_state_s *priv, uint32 cid[4]);
#else
# define mmcsd_decodeCID(priv,cid)
#endif
static void mmcsd_decodeSCR(struct mmcsd_state_s *priv, uint32 scr[2]);
static int mmcsd_verifystandby(struct mmcsd_state_s *priv);
static int mmcsd_verifyidle(struct mmcsd_state_s *priv);
/* 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 void mmcsd_mediachange(FAR void *arg);
static int mmcsd_widebus(struct mmcsd_state_s *priv);
static int mmcsd_mmcinitialize(struct mmcsd_state_s *priv);
static int mmcsd_sdinitialize(struct mmcsd_state_s *priv);
static 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 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
****************************************************************************/
/****************************************************************************
* Misc Helpers
****************************************************************************/
static void mmcsd_takesem(struct mmcsd_state_s *priv)
{
/* Take the semaphore (perhaps waiting) */
while (sem_wait(&priv->sem) != 0)
{
/* The only case that an error should occr here is if the wait was
* awakened by a signal.
*/
ASSERT(errno == EINTR);
}
}
/****************************************************************************
* 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;
}
/****************************************************************************
* Name: mmcsd_sendcmdpoll
*
* Description:
* Set the Driver Stage Register (DSR) if (1) a CONFIG_MMCSD_DSR has been
* provided and (2) the card supports a DSR register. If no DSR value
* the card default value (0x0404) will be used.
*
****************************************************************************/
static inline int mmcsd_sendcmd4(struct mmcsd_state_s *priv)
{
int ret = OK;
#ifdef CONFIG_MMCSD_DSR
/* The dsr_imp bit from the CSD will tell us if the card supports setting
* the DSR via CMD4 or not.
*/
if (priv->dsrimp != FALSE)
{
/* CMD4 = SET_DSR will set the cards DSR register. The DSR and CMD4
* support are optional. However, since this is a broadcast command
* with no response (like CMD0), we will never know if the DSR was
* set correctly or not
*/
mmcsd_sendcmdpoll(priv, MMCSD_CMD4, CONFIG_MMCSD_DSR << 16);
up_udelay(MMCSD_DSR_DELAY);
/* Send it again to have more confidence */
mmcsd_sendcmdpoll(priv, MMCSD_CMD4, CONFIG_MMCSD_DSR << 16);
up_udelay(MMCSD_DSR_DELAY);
}
#endif
return ret;
}
/****************************************************************************
* Name: mmcsd_recvR1
*
* Description:
* Receive R1 response and check for errors.
*
****************************************************************************/
static int mmcsd_recvR1(struct mmcsd_state_s *priv, uint32 cmd)
{
uint32 r1;
int ret;
/* Get the R1 response from the hardware */
ret = SDIO_RECVR1(priv->dev, cmd, &r1);
if (ret == OK)
{
/* Check if R1 reports an error */
if ((r1 & MMCSD_R1_ERRORMASK) != 0)
{
ret = -EIO;
}
}
return ret;
}
/****************************************************************************
* Name: mmcsd_getSCR
*
* Description:
* Obtain the SD card's Configuration Register (SCR)
*
* Returned Value:
* OK on success; a negated ernno on failure.
*
****************************************************************************/
static int mmcsd_getSCR(struct mmcsd_state_s *priv, uint32 scr[2])
{
int ret;
/* Set Block Size To 8 Bytes */
/* Send CMD55 APP_CMD with argument as card's RCA */
mmcsd_sendcmdpoll(priv, MMCSD_CMD16, 8);
ret = mmcsd_recvR1(priv, MMCSD_CMD16);
if (ret != OK)
{
fdbg("ERROR: RECVR1 for CMD16 failed: %d\n", ret);
return ret;
}
/* Send CMD55 APP_CMD with argument as card's RCA */
mmcsd_sendcmdpoll(priv, SD_CMD55, (uint32)priv->rca << 16);
ret = mmcsd_recvR1(priv, SD_CMD55);
if (ret != OK)
{
fdbg("ERROR: RECVR1 for CMD55 failed: %d\n", ret);
return ret;
}
/* Setup up to receive data with interrupt mode */
SDIO_RECVSETUP(priv->dev, (FAR ubyte*)scr, 8);
/* Send ACMD51 SD_APP_SEND_SCR with argument as 0 to start data receipt */
(void)SDIO_WAITENABLE(priv->dev, SDIOWAIT_TRANSFERDONE);
mmcsd_sendcmdpoll(priv, SD_ACMD51, 0);
ret = mmcsd_recvR1(priv, SD_ACMD51);
if (ret != OK)
{
fdbg("ERROR: RECVR1 for ACMD51 failed: %d\n", ret);
return ret;
}
/* Wait for data to be transferred */
ret = SDIO_EVENTWAIT(priv->dev, MMCSD_SCR_DATADELAY);
if (ret != OK)
{
fdbg("ERROR: WAITEVENT for READ DATA failed: %d\n", ret);
}
return ret;
}
/****************************************************************************
* Name: mmcsd_decodeCSD
*
* Description:
* Decode and extract necessary information from the CSD. If debug is
* enabled, then decode and show the full contents of the CSD.
*
* Returned Value:
* OK on success; a negated ernno on failure. On success, the following
* values will be set in the driver state structure:
*
* priv->dsrimp TRUE: card supports CMD4/DSR setting (from CSD)
* priv->blocksize Read block length (== block size)
* priv->nblocks Number of blocks
* priv->capacity Total capacity of volume
*
****************************************************************************/
static void mmcsd_decodeCSD(struct mmcsd_state_s *priv, uint32 csd[4])
{
#if defined(CONFIG_DEBUG) && defined (CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_FS)
struct mmcsd_csd_s decoded;
#endif
unsigned int readbllen;
/* Word 1: Bits 127-96:
*
* CSD_STRUCTURE 127:126 CSD structure
* SPEC_VERS 125:122 (MMC) Spec version
* TAAC 119:112 Data read access-time-1
* TIME_VALUE 6:3 Time mantissa
* TIME_UNIT 2:0 Time exponent
* NSAC 111:104 Data read access-time-2 in CLK cycle(NSAC*100)
* TRAN_SPEED 103:96 Max. data transfer rate
* TIME_VALUE 6:3 Rate exponent
* TRANSFER_RATE_UNIT 2:0 Rate mantissa
*/
#if defined(CONFIG_DEBUG) && defined (CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_FS)
decoded.csdstructure = csd[0] >> 30;
decoded.mmcspecvers = (csd[0] >> 26) & 0x0f;
decoded.taac.timevalue = (csd[0] >> 19) & 0x0f;
decoded.taac.timeunit = (csd[0] >> 16) & 7;
decoded.nsac = (csd[0] >> 8) & 0xff;
decoded.transpeed.timevalue = (csd[0] >> 3) & 0x0f;
decoded.transpeed.transferrateunit = csd[0] & 7;
#endif
/* Word 2: Bits 64:95
* CCC 95:84 Card command classes
* READ_BL_LEN 83:80 Max. read data block length
* READ_BL_PARTIAL 79:79 Partial blocks for read allowed
* WRITE_BLK_MISALIGN 78:78 Write block misalignment
* READ_BLK_MISALIGN 77:77 Read block misalignment
* DSR_IMP 76:76 DSR implemented
* Byte addressed SD and MMC:
* C_SIZE 73:62 Device size
* Block addressed SD:
* 75:70 (reserved)
* C_SIZE 48:69 Device size
*/
priv->dsrimp = (csd[1] >> 12) & 1;
readbllen = (csd[1] >> 16) & 0x0f;
#if defined(CONFIG_DEBUG) && defined (CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_FS)
decoded.ccc = (csd[1] >> 20) & 0x0fff;
decoded.readbllen = (csd[1] >> 16) & 0x0f;
decoded.readblpartial = (csd[1] >> 15) & 1;
decoded.writeblkmisalign = (csd[1] >> 14) & 1;
decoded.readblkmisalign = (csd[1] >> 13) & 1;
decoded.dsrimp = priv->dsrimp;
#endif
/* Word 3: Bits 32-63
*
* Byte addressed SD:
* C_SIZE 73:62 Device size
* VDD_R_CURR_MIN 61:59 Max. read current at Vcc min
* VDD_R_CURR_MAX 58:56 Max. read current at Vcc max
* VDD_W_CURR_MIN 55:53 Max. write current at Vcc min
* VDD_W_CURR_MAX 52:50 Max. write current at Vcc max
* C_SIZE_MULT 49:47 Device size multiplier
* SD_ER_BLK_EN 46:46 Erase single block enable (SD only)
* SD_SECTOR_SIZE 45:39 Erase sector size
* SD_WP_GRP_SIZE 38:32 Write protect group size
* Block addressed SD:
* 75:70 (reserved)
* C_SIZE 48:69 Device size
* 47:47 (reserved)
* SD_ER_BLK_EN 46:46 Erase single block enable (SD only)
* SD_SECTOR_SIZE 45:39 Erase sector size
* SD_WP_GRP_SIZE 38:32 Write protect group size
* MMC:
* C_SIZE 73:62 Device size
* VDD_R_CURR_MIN 61:59 Max. read current at Vcc min
* VDD_R_CURR_MAX 58:56 Max. read current at Vcc max
* VDD_W_CURR_MIN 55:53 Max. write current at Vcc min
* VDD_W_CURR_MAX 52:50 Max. write current at Vcc max
* C_SIZE_MULT 49:47 Device size multiplier
* MMC_SECTOR_SIZE 46:42 Erase sector size
* MMC_ER_GRP_SIZE 41:37 Erase group size (MMC)
* MMC_WP_GRP_SIZE 36:32 Write protect group size
*/
if (IS_BLOCK(priv->type))
{
/* C_SIZE: 69:64 from Word 2 and 63:48 from Word 3
*
* 512 = (1 << 9)
* 1024 = (1 << 10)
* 512*1024 = (1 << 19)
*/
uint32 csize = ((csd[1] & 0x3f) << 16) | (csd[2] >> 16);
priv->capacity = (csize + 1) << 19;
priv->blocksize = 1 << 9;
priv->nblocks = priv->capacity >> 9;
#if defined(CONFIG_DEBUG) && defined (CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_FS)
decoded.u.sdblock.csize = csize;
decoded.u.sdblock.sderblen = (csd[2] >> 14) & 1;
decoded.u.sdblock.sdsectorsize = (csd[2] >> 7) & 0x7f;
decoded.u.sdblock.sdwpgrpsize = csd[2] & 0x7f;
#endif
}
else
{
/* C_SIZE: 73:64 from Word 2 and 63:62 from Word 3 */
uint16 csize = ((csd[1] & 0x03ff) << 2) | ((csd[2] >> 30) & 3);
ubyte csizemult = (csd[2] >> 15) & 7;
priv->nblocks = ((uint32)csize + 1) * (1 << (csizemult + 2));
priv->blocksize = (1 << readbllen);
priv->capacity = priv->nblocks * priv->blocksize;
#if defined(CONFIG_DEBUG) && defined (CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_FS)
if (IS_SD(priv->type))
{
decoded.u.sdbyte.csize = csize;
decoded.u.sdbyte.vddrcurrmin = (csd[2] >> 27) & 7;
decoded.u.sdbyte.vddrcurrmax = (csd[2] >> 24) & 7;
decoded.u.sdbyte.vddwcurrmin = (csd[2] >> 21) & 7;
decoded.u.sdbyte.vddwcurrmax = (csd[2] >> 18) & 7;
decoded.u.sdbyte.csizemult = csizemult;
decoded.u.sdbyte.sderblen = (csd[2] >> 14) & 1;
decoded.u.sdbyte.sdsectorsize = (csd[2] >> 7) & 0x7f;
decoded.u.sdbyte.sdwpgrpsize = csd[2] & 0x7f;
}
#ifdef CONFIG_MMCSD_MMCSUPPORT
else if (IS_MMC(priv->type))
{
decoded.u.mmc.csize = csize;
decoded.u.mmc.vddrcurrmin = (csd[2] >> 27) & 7;
decoded.u.mmc.vddrcurrmax = (csd[2] >> 24) & 7;
decoded.u.mmc.vddwcurrmin = (csd[2] >> 21) & 7;
decoded.u.mmc.vddwcurrmax = (csd[2] >> 18) & 7;
decoded.u.mmc.csizemult = csizemult;
decoded.u.mmc.er.mmc22.sectorsize = (csd[2] >> 10) & 0x1f;
decoded.u.mmc.er.mmc22.ergrpsize = (csd[2] >> 5) & 0x1f;
decoded.u.mmc.mmcwpgrpsize = csd[2] & 0x1f;
}
#endif
#endif
}
/* Word 4: Bits 0-31
* WP_GRP_EN 31:31 Write protect group enable
* MMC DFLT_ECC 30:29 Manufacturer default ECC (MMC only)
* R2W_FACTOR 28:26 Write speed factor
* WRITE_BL_LEN 25:22 Max. write data block length
* WRITE_BL_PARTIAL 21:21 Partial blocks for write allowed
* FILE_FORMAT_GROUP 15:15 File format group
* COPY 14:14 Copy flag (OTP)
* PERM_WRITE_PROTECT 13:13 Permanent write protection
* TMP_WRITE_PROTECT 12:12 Temporary write protection
* FILE_FORMAT 10:11 File format
* ECC 9:8 ECC (MMC only)
* CRC 7:1 CRC
* Not used 0:0
*/
#if defined(CONFIG_DEBUG) && defined (CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_FS)
decoded.wpgrpen = csd[3] >> 31;
decoded.mmcdfltecc = (csd[3] >> 29) & 3;
decoded.r2wfactor = (csd[3] >> 26) & 7;
decoded.writebllen = (csd[3] >> 22) & 0x0f;
decoded.writeblpartial = (csd[3] >> 21) & 1;
decoded.fileformatgrp = (csd[3] >> 15) & 1;
decoded.copy = (csd[3] >> 14) & 1;
decoded.permwriteprotect = (csd[3] >> 13) & 1;
decoded.tmpwriteprotect = (csd[3] >> 12) & 1;
decoded.fileformat = (csd[3] >> 10) & 3;
decoded.mmcecc = (csd[3] >> 8) & 3;
decoded.crc = (csd[3] >> 1) & 0x7f;
fvdbg("CSD:\n");
fvdbg(" CSD_STRUCTURE: %d SPEC_VERS: %d (MMC)\n",
decoded.csdstructure, decoded.mmcspecvers);
fvdbg(" TAAC {TIME_UNIT: %d TIME_UNIT: %d} NSAC: %d\n",
decoded.taac.timeunit, decoded.taac.timevalue, decoded.nsac);
fvdbg(" TRAN_SPEED {TRANSFER_RATE_UNIT: %d TIME_VALUE: %d}\n",
decoded.transpeed.transferrateunit, decoded.transpeed.timevalue);
fvdbg(" CCC: %d\n", decoded.ccc);
fvdbg(" READ_BL_LEN: %d READ_BL_PARTIAL: %d\n",
decoded.readbllen, decoded.readblpartial);
fvdbg(" WRITE_BLK_MISALIGN: %d READ_BLK_MISALIGN: %d\n",
decoded.writeblkmisalign, decoded.readblkmisalign);
fvdbg(" DSR_IMP: %d\n",
decoded.dsrimp);
if (IS_BLOCK(priv->type))
{
fvdbg(" SD Block Addressing:\n");
fvdbg(" C_SIZE: %d SD_ER_BLK_EN: %d\n",
decoded.u.sdblock.csize, decoded.u.sdblock.sderblen);
fvdbg(" SD_SECTOR_SIZE: %d SD_WP_GRP_SIZE: %d\n",
decoded.u.sdblock.sdsectorsize, decoded.u.sdblock.sdwpgrpsize);
}
else if (IS_SD(priv->type))
{
fvdbg(" SD Byte Addressing:\n");
fvdbg(" C_SIZE: %d C_SIZE_MULT: %d\n",
decoded.u.sdbyte.csize, decoded.u.sdbyte.csizemult);
fvdbg(" VDD_R_CURR_MIN: %d VDD_R_CURR_MAX: %d\n",
decoded.u.sdbyte.vddrcurrmin, decoded.u.sdbyte.vddrcurrmax);
fvdbg(" VDD_W_CURR_MIN: %d VDD_W_CURR_MAX: %d\n",
decoded.u.sdbyte.vddwcurrmin, decoded.u.sdbyte.vddwcurrmax);
fvdbg(" SD_ER_BLK_EN: %d SD_SECTOR_SIZE: %d (SD) SD_WP_GRP_SIZE: %d\n",
decoded.u.sdbyte.sderblen, decoded.u.sdbyte.sdsectorsize, decoded.u.sdbyte.sdwpgrpsize);
}
#ifdef CONFIG_MMCSD_MMCSUPPORT
else if (IS_MMC(priv->type))
{
fvdbg(" MMC:\n");
fvdbg(" C_SIZE: %d C_SIZE_MULT: %d\n",
decoded.u.mmc.csize, decoded.u.mmc.csizemult);
fvdbg(" VDD_R_CURR_MIN: %d VDD_R_CURR_MAX: %d\n",
decoded.u.mmc.vddrcurrmin, decoded.u.mmc.vddrcurrmax);
fvdbg(" VDD_W_CURR_MIN: %d VDD_W_CURR_MAX: %d\n",
decoded.u.mmc.vddwcurrmin, decoded.u.mmc.vddwcurrmax);
fvdbg(" MMC_SECTOR_SIZE: %d MMC_ER_GRP_SIZE: %d MMC_WP_GRP_SIZE: %d\n",
decoded.u.mmc.er.mmc22.sectorsize, decoded.u.mmc.er.mmc22.ergrpsize,
decoded.u.mmc.mmcwpgrpsize);
}
#endif
fvdbg(" WP_GRP_EN: %d MMC DFLT_ECC: %d (MMC) R2W_FACTOR: %d\n",
decoded.wpgrpen, decoded.mmcdfltecc, decoded.r2wfactor);
fvdbg(" WRITE_BL_LEN: %d WRITE_BL_PARTIAL: %d\n",
decoded.writebllen, decoded.writeblpartial);
fvdbg(" FILE_FORMAT_GROUP: %d COPY: %d\n",
decoded.fileformatgrp, decoded.copy);
fvdbg(" PERM_WRITE_PROTECT: %d TMP_WRITE_PROTECT: %d\n",
decoded.permwriteprotect, decoded.tmpwriteprotect);
fvdbg(" FILE_FORMAT: %d ECC: %d (MMC) CRC: %d\n",
decoded.fileformat, decoded.mmcecc, decoded.crc);
fvdbg("Capacity: %dKb, Block size: %db, nblocks: %d\n",
priv->capacity / 1024, priv->blocksize, priv->nblocks);
#endif
}
/****************************************************************************
* Name: mmcsd_decodeCID
*
* Description:
* Show the contents of the Card Indentification Data (CID) (for debug
* purposes only)
*
****************************************************************************/
#if defined(CONFIG_DEBUG) && defined (CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_FS)
static void mmcsd_decodeCID(struct mmcsd_state_s *priv, uint32 cid[4])
{
struct mmcsd_cid_s decoded;
/* Word 1: Bits 127-96:
* mid - 127-120 8-bit Manufacturer ID
* oid - 119-104 16-bit OEM/Application ID (ascii)
* pnm - 103-64 40-bit Product Name (ascii) + null terminator
* pnm[0] 103:96
*/
decoded.mid = cid[0] >> 24;
decoded.oid = (cid[0] >> 16) & 0xffff;
decoded.pnm[0] = cid[0] & 0xff;
/* Word 2: Bits 64:95
* pnm - 103-64 40-bit Product Name (ascii) + null terminator
* pnm[1] 95:88
* pnm[2] 87:80
* pnm[3] 79:72
* pnm[4] 71:64
*/
decoded.pnm[1] = cid[1] >> 24;
decoded.pnm[2] = (cid[1] >> 16) & 0xff;
decoded.pnm[3] = (cid[1] >> 8) & 0xff;
decoded.pnm[4] = cid[1] & 0xff;
decoded.pnm[5] = '\0';
/* Word 3: Bits 32-63
* prv - 63-56 8-bit Product revision
* psn - 55-24 32-bit Product serial number
*/
decoded.prv = cid[2] >> 24;
decoded.psn = cid[2] << 8;
/* Word 4: Bits 0-31
* psn - 55-24 32-bit Product serial number
* 23-20 4-bit (reserved)
* mdt - 19:8 12-bit Manufacturing date
* crc - 7:1 7-bit CRC7
*/
decoded.psn |= cid[3] >> 24;
decoded.mdt = (cid[3] >> 8) & 0x0fff;
decoded.crc = (cid[3] >> 1) & 0x7f;
fvdbg("mid: %02x oid: %04x pnm: %s prv: %d psn: %d mdt: %02x crc: %02x\n",
decoded.mid, decoded.oid, decoded.pnm, decoded.prv,
decoded.psn, decoded.mdt, decoded.crc);
}
#endif
/****************************************************************************
* Name: mmcsd_decodeSCR
*
* Description:
* Show the contents of the SD Configuration Register (SCR). The only
* value retained is: priv->buswidth;
*
****************************************************************************/
static void mmcsd_decodeSCR(struct mmcsd_state_s *priv, uint32 scr[2])
{
#if defined(CONFIG_DEBUG) && defined (CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_FS)
struct mmcsd_scr_s decoded;
#endif
/* Word 1, bits 63:32
* SCR_STRUCTURE 63:60 4-bit SCR structure version
* SD_VERSION 59:56 4-bit SD memory spec. version
* DATA_STATE_AFTER_ERASE 55:55 1-bit erase status
* SD_SECURITY 54:52 3-bit SD security support level
* SD_BUS_WIDTHS 51:48 4-bit bus width indicator
* Reserved 47:32 16-bit SD reserved space
* usage.
*
*/
priv->buswidth = (scr[0] >> 16) & 15;
#if defined(CONFIG_DEBUG) && defined (CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_FS)
decoded.scrversion = scr[0] >> 28;
decoded.sdversion = (scr[0] >> 24) & 15;
decoded.erasestate = (scr[0] >> 23) & 1;
decoded.security = (scr[0] >> 20) & 7;
decoded.buswidth = priv->buswidth;
#endif
/* Word 1, bits 63:32
* Reserved 31:0 32-bits reserved for manufacturing
* usage.
*
*/
#if defined(CONFIG_DEBUG) && defined (CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_FS)
decoded.mfgdata = scr[1];
fvdbg("SCR:\n");
fvdbg(" SCR_STRUCTURE: %d SD_VERSION: %d\n",
decoded.scrversion,decoded.sdversion);
fvdbg(" DATA_STATE_AFTER_ERASE: %d SD_SECURITY: %d SD_BUS_WIDTHS: %x\n",
decoded.erasestate, decoded.security, decoded.buswidth);
fvdbg(" Manufacturing data: %08x\n",
decoded.mfgdata);
#endif
}
/****************************************************************************
* Name: mmcsd_verifystandby
*
* Description:
* Verify that the card is in STANDBY state
*
****************************************************************************/
static int mmcsd_verifystandby(struct mmcsd_state_s *priv)
{
#warning "Not implemented"
return -ENOSYS;
}
/****************************************************************************
* Name: mmcsd_verifystandby
*
* Description:
* Verify that the card is in IDLE state
*
****************************************************************************/
static int mmcsd_verifyidle(struct mmcsd_state_s *priv)
{
#warning "Not implemented"
return -ENOSYS;
}
/****************************************************************************
* 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);
mmcsd_takesem(priv);
priv->crefs++;
mmcsd_givesem(priv);
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);
mmcsd_takesem(priv);
priv->crefs--;
mmcsd_givesem(priv);
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;
int ret;
fvdbg("sector: %d nsectors: %d sectorsize: %d\n");
DEBUGASSERT(inode && inode->i_private);
priv = (struct mmcsd_state_s *)inode->i_private;
mmcsd_takesem(priv);
#ifdef CONFIG_FS_READAHEAD
ret = rwb_read(&priv->rwbuffer, start_sector, nsectors, buffer);
#else
ret = mmcsd_doread(priv, buffer, start_sector, nsectors);
#endif
mmcsd_givesem(priv);
return ret;
}
/****************************************************************************
* 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;
int ret;
fvdbg("sector: %d nsectors: %d sectorsize: %d\n");
DEBUGASSERT(inode && inode->i_private);
priv = (struct mmcsd_state_s *)inode->i_private;
mmcsd_takesem(priv);
#ifdef CONFIG_FS_WRITEBUFFER
ret = rwb_write(&priv->rwbuffer, start_sector, nsectors, buffer);
#else
ret = mmcsd_dowrite(priv, buffer, start_sector, nsectors);
#endif
mmcsd_givesem(priv);
return ret;
}
#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;
mmcsd_takesem(priv);
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->blocksize;
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;
}
mmcsd_givesem(priv);
}
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 */
mmcsd_takesem(priv);
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);
}
/* Enable logic to detect if a card is re-inserted */
SDIO_CALLBACKENABLE(priv->dev, SDIOMEDIA_INSERTED);
}
break;
default:
ret = -ENOTTY;
break;
}
mmcsd_givesem(priv);
return ret;
}
/****************************************************************************
* Initialization/uninitialization/reset
****************************************************************************/
/****************************************************************************
* Name: mmcsd_mediachange
*
* Description:
* This is a callback function from the SDIO driver that indicates that
* there has been a change in the slot... either a card has been inserted
* or a card has been removed.
*
* Assumptions:
* This callback is NOT supposd to run in the context of an interrupt
* handler; it is probably running in the context of work thread.
*
****************************************************************************/
static void mmcsd_mediachange(FAR void *arg)
{
struct mmcsd_state_s *priv = (struct mmcsd_state_s *)arg;
DEBUGASSERT(priv);
/* Is there a card present in the slot? */
mmcsd_takesem(priv);
if (SDIO_PRESENT(priv->dev))
{
/* No... process the card insertion. This could cause chaos if we think
* that a card is already present and there are mounted filesystms!
*/
(void)mmcsd_probe(priv);
}
else
{
/* No... process the card removal. This could have very bad implications
* for any mounted file systems!
*/
(void)mmcsd_removed(priv);
/* Enable logic to detect if a card is re-inserted */
SDIO_CALLBACKENABLE(priv->dev, SDIOMEDIA_INSERTED);
}
mmcsd_givesem(priv);
}
/****************************************************************************
* Name: mmcsd_widebus
*
* Description:
* An SD card has been inserted and its SCR has been obtained. Select wide
* (4-bit) bus operation if the card supports it.
*
* Assumptions:
* This function is called only once per card insertion as part of the SD
* card initialization sequence. It is not necessary to reselect the card
* there is not need to check if wide bus operation has already been
* selected.
*
****************************************************************************/
static int mmcsd_widebus(struct mmcsd_state_s *priv)
{
int ret;
/* Check if the SD card supports this feature (as reported in the SCR) */
if ((priv->buswidth & MMCSD_SCR_BUSWIDTH_4BIT) != 0)
{
/* Disconnect any CD/DAT3 pull up using ACMD42. ACMD42 is optional and
* need not be supported by all SD calls.
*
* First end CMD55 APP_CMD with argument as card's RCA.
*/
mmcsd_sendcmdpoll(priv, SD_CMD55, (uint32)priv->rca << 16);
ret = mmcsd_recvR1(priv, SD_CMD55);
if (ret != OK)
{
fdbg("ERROR: RECVR1 for CMD55 of ACMD42: %d\n", ret);
return ret;
}
/* Then send ACMD42 with the argument to disconnect the CD/DAT3
* pullup
*/
mmcsd_sendcmdpoll(priv, SD_ACMD42, MMCSD_ACMD42_CD_DISCONNECT);
ret = mmcsd_recvR1(priv, SD_ACMD42);
if (ret != OK)
{
fvdbg("WARNING: SD card does not support ACMD42: %d\n", ret);
return ret;
}
/* Now send ACMD6 to select wide, 4-bit bus operation, beginning
* with CMD55, APP_CMD:
*/
mmcsd_sendcmdpoll(priv, SD_CMD55, (uint32)priv->rca << 16);
ret = mmcsd_recvR1(priv, SD_CMD55);
if (ret != OK)
{
fdbg("ERROR: RECVR1 for CMD55 of ACMD6: %d\n", ret);
return ret;
}
/* Then send ACMD6 */
mmcsd_sendcmdpoll(priv, SD_ACMD6, MMCSD_ACMD6_BUSWIDTH_4);
ret = mmcsd_recvR1(priv, SD_ACMD6);
if (ret != OK)
{
return ret;
}
/* Configure the SDIO peripheral */
fvdbg("Wide bus operation selected\n");
SDIO_WIDEBUS(priv->dev, TRUE);
priv->widebus = TRUE;
SDIO_CLOCK(priv->dev, CLOCK_SD_TRANSFER_4BIT);
up_udelay(MMCSD_CLK_DELAY);
return OK;
}
/* Wide bus operation not supported */
fdbg("WARNING: Card does not support wide-bus operation\n");
return -ENOSYS;
}
/****************************************************************************
* 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 int mmcsd_mmcinitialize(struct mmcsd_state_s *priv)
{
#ifdef CONFIG_MMCSD_MMCSUPPORT
uint32 cid[4];
uint32 csd[4];
int ret;
/* At this point, slow, ID mode clocking has been supplied to the card
* and CMD0 has been sent successfully. CMD1 succeeded and ACMD41 failed
* so there is good evidence that we have an MMC card inserted into the
* slot.
*
* Send CMD2, ALL_SEND_CID. This implementation supports only one MMC slot.
* If mulitple cards were installed, each card would respond to CMD2 by
* sending its CID (only one card completes the response at a time). The
* driver should send CMD2 and assign an RCAs until no response to
* ALL_SEND_CID is received. CMD2 causes transition to identification state/
* card-identification mode */
mmcsd_sendcmdpoll(priv, MMCSD_CMD2, 0);
ret = SDIO_RECVR2(priv->dev, MMCSD_CMD2, cid);
if (ret != OK)
{
fdbg("ERROR: SDIO_RECVR2 for MMC CID failed: %d\n", ret);
return ret;
}
mmcsd_decodeCID(priv, cid);
/* Send CMD3, SET_RELATIVE_ADDR. This command is used to assign a logical
* address to the card. For MMC, the host assigns the address. CMD3 causes
* transition to standby state/data-transfer mode
*/
priv->rca = 1; /* There is only one card */
mmcsd_sendcmdpoll(priv, MMC_CMD3, priv->rca << 16);
ret = mmcsd_recvR1(priv, MMC_CMD3);
if (ret != OK)
{
fdbg("ERROR: mmcsd_recvR1(CMD3) failed: %d\n", ret);
return ret;
}
/* This should have caused a transition to standby state. However, this will
* not be reflected in the present R1 status. R1/6 contains the state of the
* card when the command was received, not when it completed execution.
*
* Verify that we are in standby state/data-transfer mode
*/
ret = mmcsd_verifystandby(priv);
if (ret != OK)
{
fdbg("ERROR: Failed to enter standby state\n");
return ret;
}
/* Send CMD9, SEND_CSD in standby state/data-transfer mode to obtain the
* Card Specific Data (CSD) register, e.g., block length, card storage
* capacity, etc. (Stays in standy state/data-transfer mode)
*/
mmcsd_sendcmdpoll(priv, MMCSD_CMD9, priv->rca << 16);
ret = SDIO_RECVR2(priv->dev, MMCSD_CMD9, csd);
if (ret != OK)
{
fdbg("ERROR: Could not get SD CSD register: %d\n", ret);
return ret;
}
mmcsd_decodeCSD(priv, csd);
/* Set the Driver Stage Register (DSR) if (1) a CONFIG_MMCSD_DSR has been
* provided and (2) the card supports a DSR register. If no DSR value
* the card default value (0x0404) will be used.
*/
(void)mmcsd_sendcmd4(priv);
/* Select high speed MMC clocking (which may depend on the DSR setting) */
SDIO_CLOCK(priv->dev, CLOCK_MMC_TRANSFER);
up_udelay( MMCSD_CLK_DELAY);
#endif
return OK;
}
/****************************************************************************
* 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 int mmcsd_sdinitialize(struct mmcsd_state_s *priv)
{
uint32 cid[4];
uint32 csd[4];
uint32 scr[2];
uint32 rca;
int ret;
/* At this point, clocking has been supplied to the card, both CMD0 and
* ACMD41 (with OCR=0) have been sent successfully, the card is no longer
* busy and (presumably) in the IDLE state so there is good evidence
* that we have an SD card inserted into the slot.
*
* Send CMD2, ALL_SEND_CID. The SD CMD2 is similar to the MMC CMD2 except
* that the buffer type used to transmit to response of the card (SD Memory
* Card: Push-Pull, MMC: Open-Drain). This implementation supports only a
* single SD card. If multiple cards were installed in the slot, each card
* would respond to CMD2 by sending its CID (only one card completes the
* response at a time). The driver should send CMD2 and obtain RCAs until
* no response to ALL_SEND_CID is received.
*
* When an SD card receives the CMD2 command it should transition to the
* identification state/card-identification mode
*/
mmcsd_sendcmdpoll(priv, MMCSD_CMD2, 0);
ret = SDIO_RECVR2(priv->dev, MMCSD_CMD2, cid);
if (ret != OK)
{
fdbg("ERROR: SDIO_RECVR2 for SD CID failed: %d\n", ret);
return ret;
}
mmcsd_decodeCID(priv, cid);
/* Send CMD3, SET_RELATIVE_ADDR. In both protocols, this command is used
* to assign a logical address to the card. For MMC, the host assigns the
* address; for SD, the memory card has this responsibility. CMD3 causes
* transition to standby state/data-transfer mode
*
* Send CMD3 with argument 0, SD card publishes its RCA in the response.
*/
mmcsd_sendcmdpoll(priv, SD_CMD3, 0);
ret = SDIO_RECVR6(priv->dev, SD_CMD3, &rca);
if (ret != OK)
{
return ret;
}
/* R6 Published RCA Response (48-bit, SD card only)
* 47 0 Start bit
* 46 0 Transmission bit (0=from card)
* 45:40 bit5 - bit0 Command index (0-63)
* 39:8 bit31 - bit0 32-bit Argument Field, consisting of:
* [31:16] New published RCA of card
* [15:0] Card status bits {23,22,19,12:0}
* 7:1 bit6 - bit0 CRC7
* 0 1 End bit
*/
priv->rca = (uint16)(rca >> 16);
fvdbg("RCA: %04x\n", priv->rca);
/* This should have caused a transition to standby state. However, this will
* not be reflected in the present R1 status. R1/6 contains the state of
* the card when the command was received, not when it completed execution.
*
* Verify that we are in standby state/data-transfer mode
*/
ret = mmcsd_verifystandby(priv);
if (ret != OK)
{
fdbg("ERROR: Failed to enter standby state\n");
return ret;
}
/* Send CMD9, SEND_CSD, in standby state/data-transfer mode to obtain the
* Card Specific Data (CSD) register. The argument is the RCA that we
* just obtained from CMD3. The card stays in standy state/data-transfer
* mode.
*/
mmcsd_sendcmdpoll(priv, MMCSD_CMD9, priv->rca << 16);
ret = SDIO_RECVR2(priv->dev, MMCSD_CMD9, csd);
if (ret != OK)
{
fdbg("ERROR: Could not get SD CSD register(%d)\n", ret);
return ret;
}
mmcsd_decodeCSD(priv, csd);
/* Set the Driver Stage Register (DSR) if (1) a CONFIG_MMCSD_DSR has been
* provided and (2) the card supports a DSR register. If no DSR value
* the card default value (0x0404) will be used.
*/
(void)mmcsd_sendcmd4(priv);
/* Select high speed SD clocking (which may depend on the DSR setting) */
SDIO_CLOCK(priv->dev, CLOCK_SD_TRANSFER_1BIT);
up_udelay(MMCSD_CLK_DELAY);
/* Get the SD card Configuration Register (SCR). We need this now because
* that configuration register contains the indication whether or not
* this card supports wide bus operation.\
*/
ret = mmcsd_getSCR(priv, scr);
if (ret != OK)
{
fdbg("ERROR: Could not get SD SCR register(%d)\n", ret);
return ret;
}
mmcsd_decodeSCR(priv, scr);
/* Select width (4-bit) bus operation (if the card supports it) */
ret = mmcsd_widebus(priv);
if (ret != OK)
{
fdbg("WARN: Failed to set wide bus operation: %d\n", ret);
}
return OK;
}
/****************************************************************************
* 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 int mmcsd_cardidentify(struct mmcsd_state_s *priv)
{
uint32 response;
uint32 start;
uint32 elapsed;
uint32 sdcapacity = MMCSD_ACMD41_STDCAPACITY;
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 = MMCSD_ACMD41_HIGHCAPACITY;
}
else
{
fdbg("ERROR: R7: %08x\n", response);
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
{
/* We may have already determined that his card is an MMC card from
* an earlier pass through through this loop. In that case, we should
* skip the SD-specific commands.
*/
#ifdef CONFIG_MMCSD_MMCSUPPORT
if (priv->type != MMCSD_CARDTYPE_MMC)
#endif
{
/* Send CMD55 */
mmcsd_sendcmdpoll(priv, SD_CMD55, 0);
ret = mmcsd_recvR1(priv, SD_CMD55);
if (ret != OK)
{
/* I am a little confused.. I think both SD and MMC cards support
* CMD55 (but maybe only SD cards support CMD55). We'll make the
* the MMC vs. SD decision based on CMD1 and ACMD41.
*/
fdbg("ERROR: mmcsd_recvR1(CMD55) failed: %d\n", ret);
}
else
{
/* Send ACMD41 */
mmcsd_sendcmdpoll(priv, SD_ACMD41, MMCSD_ACMD41_VOLTAGEWINDOW|sdcapacity);
ret = SDIO_RECVR3(priv->dev, SD_CMD55, &response);
if (ret != OK)
{
/* If the error is a timeout, then it is probably an MMC card,
* but we will make the decision based on CMD1 below
*/
fdbg("ERROR: ACMD41 RECVR3: %d\n", ret);
}
else
{
/* ACMD41 succeeded. ACMD41 is supported by SD V1.x and SD V2.x,
* but not MMC. If we did not previously 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;
}
/* Check if the card is busy */
if ((response & MMCSD_CARD_BUSY) == 0)
{
/* No.. We really should check the current state to see if
* the SD card successfully made it to the IDLE state, but
* at least for now, we will simply assume that that is the
* case.
*
* Now, check if this is a SD V2.x card that supports block
* addressing
*/
if ((response & MMCSD_R3_HIGHCAPACITY) != 0)
{
fvdbg("SD V2.x card with block addressing\n");
DEBUGASSERT(priv->type == MMCSD_CARDTYPE_SDV2);
priv->type |= MMCSD_CARDTYPE_BLOCK;
}
/* And break out of the loop with an SD card identified */
break;
}
}
}
}
/* If we get here then either (1) CMD55 failed, (2) CMD41 failed, or (3)
* and SD or MMC card has been identified, but it is not yet in the IDLE state.
* If SD card has not been identified, then we might be looking at an
* MMC card. We can send the CMD1 to find out for sure. CMD1 is supported
* by MMC cards, but not by SD cards.
*/
#ifdef CONFIG_MMCSD_MMCSUPPORT
if (priv->type == MMCSD_CARDTYPE_UNKNOWN || priv->type == MMCSD_CARDTYPE_MMC)
{
/* Send the MMC CMD1 to specify the operating voltage. CMD1 causes
* transition to ready state/ card-identification mode. NOTE: If the
* card does not support this voltage range, it will go the inactive
* state.
*
* NOTE: An MMC card will only respond once to CMD1 (unless it is busy).
* This is part of the logic used to determine how many MMC cards are
* connected (This implementation supports only a single MMC card). So
* we cannot re-send CMD1 without first placing the card back into
* stand-by state (if the card is busy, it will automatically
* go back to the the standby state).
*/
mmcsd_sendcmdpoll(priv, MMC_CMD1, MMCSD_VDD_33_34);
ret = SDIO_RECVR3(priv->dev, MMC_CMD1, &response);
/* Was the operating range set successfully */
if (ret != OK)
{
fdbg("ERROR: CMD1 RECVR3: %d\n", ret);
}
else
{
/* CMD1 succeeded... this must be an MMC card */
fdbg("CMD1 succeeded, assuming MMC card\n");
priv->type = MMCSD_CARDTYPE_MMC;
/* Check if the card is busy */
if ((response & MMCSD_CARD_BUSY) == 0)
{
/* NO.. We really should check the current state to see if the
* MMC successfully made it to the IDLE state, but at least for now,
* we will simply assume that that is the case.
*
* Then break out of the look with an MMC card identified
*/
break;
}
}
}
#endif
/* Check the elapsed time. We won't keep trying this forever! */
elapsed = g_system_timer - start;
}
while (elapsed < TICK_PER_SEC && ret != OK);
/* We get here when the above loop completes, either (1) we could not
* communicate properly with the card due to errors (and the loop times
* out), or (3) it is an MMC or SD card that has successfully transitioned
* to the IDLE state (well, at least, it provided its OCR saying that it
* it is no longer busy).
*/
if (elapsed >= TICK_PER_SEC || priv->type == MMCSD_CARDTYPE_UNKNOWN)
{
fdbg("ERROR: Failed to identify card\n");
return -EIO;
}
/* Verify that we are in IDLE state */
ret = mmcsd_verifyidle(priv);
if (ret != OK)
{
fdbg("ERROR: Failed to enter IDLE state\n");
return ret;
}
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_CALLBACKENABLE(priv->dev, SDIOMEDIA_INSERTED);
}
else
{
/* Then initialize the driver according to the identified card type */
switch (priv->type)
{
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);
break;
case MMCSD_CARDTYPE_MMC: /* MMC card */
#ifdef CONFIG_MMCSD_MMCSUPPORT
ret = mmcsd_mmcinitialize(priv);
break;
#endif
case MMCSD_CARDTYPE_UNKNOWN: /* Unknown card type */
default:
fdbg("ERROR: Internal confusion: %d\n", priv->type);
ret = -EPERM;
break;
};
/* 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_CALLBACKENABLE(priv->dev, SDIOMEDIA_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_CALLBACKENABLE(priv->dev, SDIOMEDIA_INSERTED);
ret = -ENODEV;
}
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->blocksize = 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);
return OK;
}
/****************************************************************************
* Name: mmcsd_hwinitialize
*
* Description:
* One-time hardware initialization
*
****************************************************************************/
static int mmcsd_hwinitialize(struct mmcsd_state_s *priv)
{
int ret;
mmcsd_takesem(priv);
#ifdef CONFIG_SDIO_DMA
/* Does this architecture support DMA with the MMC/SD device? */
priv->dma = SDIO_DMASUPPORTED(priv->dev);
fvdbg("DMA supported: %d\n", priv->dma);
#endif
/* Attach and prepare MMC/SD interrupts */
if (SDIO_ATTACH(priv->dev))
{
fdbg("ERROR: Unable to attach MMC/SD interrupts\n");
mmcsd_givesem(priv);
return -EBUSY;
}
fvdbg("Successfully attached MMC/SD interrupts\n");
/* Register a callback so that we get informed if media is inserted or
* removed from the slot (Initially all callbacks are disabled).
*/
SDIO_REGISTERCALLBACK(priv->dev, mmcsd_mediachange, (FAR void *)priv);
/* Is there a card in the slot now? For an MMC/SD card, there are three
* possible card detect mechanisms:
*
* 1. Mechanical insertion that can be detected using the WP switch
* that is closed when a card is inserted into then SD slot (SD
* "hot insertion capable" card conector only)
* 2. Electrical insertion that can be sensed using the pull-up resistor
* on CD/DAT3 (both SD/MMC),
* 3. Or by periodic attempts to initialize the card from software.
*
* The behavior of SDIO_PRESENT() is to use whatever information is available
* on the particular platform. If no card insertion information is available
* (polling only), then SDIO_PRESENT() will always return true and we will
* try to initialize the card.
*/
if (SDIO_PRESENT(priv->dev))
{
/* Yes... probe for a card in the slot */
ret = mmcsd_probe(priv);
if (ret != OK)
{
fvdbg("Slot not empty, but initialization failed: %d\n", ret);
/* NOTE: The failure to initialize a card does not mean that
* initialization has failed! A card could be installed in the slot
* at a later time. ENODEV is return in this case, but should not be
* interpreted as an error.
*/
ret = -ENODEV;
}
}
else
{
/* No... Setup to receive the media inserted event */
SDIO_CALLBACKENABLE(priv->dev, SDIOMEDIA_INSERTED);
/* ENODEV is returned to indicate that no card is inserted in the slot. */
ret = -ENODEV;
}
/* OK is returned only if the slot initialized correctly AND the card in
* the slot was successfully configured.
*/
mmcsd_givesem(priv);
return ret;
}
/****************************************************************************
* Name: mmcsd_hwinitialize
*
* Description:
* Restore the MMC/SD slot to the uninitialized state
*
****************************************************************************/
static 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));
sem_init(&priv->sem, 0, 1);
/* 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);
errout_with_hwinit:
#endif
mmcsd_hwuninitialize(priv);
errout_with_alloc:
free(priv);
return ret;
}
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