Add mmc and emmc drivers.

4 files changed, 627 insertions, 26 deletions

diff --git a/components/drivers/sdio/SConscript b/components/drivers/sdio/SConscript
index d2c8aa4e58..95dcfa2578 100644
--- a/components/drivers/sdio/SConscript
+++ b/components/drivers/sdio/SConscript
@@ -7,6 +7,7 @@ block_dev.c
 mmcsd_core.c
 sd.c
 sdio.c
+mmc.c
 """)
 
 # The set of source files associated with this SConscript file.
diff --git a/components/drivers/sdio/block_dev.c b/components/drivers/sdio/block_dev.c
index 12986ae1de..6e78c9cd06 100644
--- a/components/drivers/sdio/block_dev.c
+++ b/components/drivers/sdio/block_dev.c
@@ -149,7 +149,7 @@ static rt_err_t rt_mmcsd_req_blk(struct rt_mmcsd_card *card,
     }
     else
     {
-        req.stop = NULL;
+        req.stop = RT_NULL;
         r_cmd = READ_SINGLE_BLOCK;
         w_cmd = WRITE_BLOCK;
     }
@@ -408,15 +408,8 @@ rt_int32_t rt_mmcsd_blk_probe(struct rt_mmcsd_card *card)
 
                     blk_dev->geometry.bytes_per_sector = 1<<9;
                     blk_dev->geometry.block_size = card->card_blksize;
-                    if (card->flags & CARD_FLAG_SDHC) 
-                    {
-                        blk_dev->geometry.sector_count = (card->csd.c_size + 1) * 1024;
-                    }
-                    else
-                    {
-                        blk_dev->geometry.sector_count = 
-                            card->card_capacity * 1024 / 512;
-                    }
+                    blk_dev->geometry.sector_count = 
+                        card->card_capacity * (1024 / 512);
     
                     rt_device_register(&blk_dev->dev, "sd0",
                         RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_REMOVABLE | RT_DEVICE_FLAG_STANDALONE);
diff --git a/components/drivers/sdio/mmc.c b/components/drivers/sdio/mmc.c
new file mode 100644
index 0000000000..badc75fcfd
--- /dev/null
+++ b/components/drivers/sdio/mmc.c
@@ -0,0 +1,586 @@
+/*
+ * File      : mmc.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author        Notes
+ * 2015-06-15     hichard     first version
+ */
+
+#include <drivers/mmcsd_core.h>
+#include <drivers/mmc.h>
+
+static const rt_uint32_t tran_unit[] =
+{
+    10000, 100000, 1000000, 10000000,
+    0,     0,      0,       0
+};
+
+static const rt_uint8_t tran_value[] =
+{
+    0,  10, 12, 13, 15, 20, 25, 30,
+    35, 40, 45, 50, 55, 60, 70, 80,
+};
+
+static const rt_uint32_t tacc_uint[] =
+{
+    1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
+};
+
+static const rt_uint8_t tacc_value[] =
+{
+    0,  10, 12, 13, 15, 20, 25, 30,
+    35, 40, 45, 50, 55, 60, 70, 80,
+};
+
+rt_inline rt_uint32_t GET_BITS(rt_uint32_t *resp,
+                               rt_uint32_t  start,
+                               rt_uint32_t  size)
+{                               
+        const rt_int32_t __size = size;
+        const rt_uint32_t __mask = (__size < 32 ? 1 << __size : 0) - 1; 
+        const rt_int32_t __off = 3 - ((start) / 32);
+        const rt_int32_t __shft = (start) & 31;
+        rt_uint32_t __res;
+
+        __res = resp[__off] >> __shft;
+        if (__size + __shft > 32)
+            __res |= resp[__off-1] << ((32 - __shft) % 32);
+
+        return __res & __mask;
+}
+
+/*
+ * Given a 128-bit response, decode to our card CSD structure.
+ */
+static rt_int32_t mmcsd_parse_csd(struct rt_mmcsd_card *card)
+{
+      rt_uint32_t a, b;
+      struct rt_mmcsd_csd *csd = &card->csd;
+      rt_uint32_t *resp = card->resp_csd;
+      
+      /*
+      * We only understand CSD structure v1.1 and v1.2.
+      * v1.2 has extra information in bits 15, 11 and 10.
+      * We also support eMMC v4.4 & v4.41.
+      */
+      csd->csd_structure = GET_BITS(resp, 126, 2);
+      if (csd->csd_structure == 0) {
+        rt_kprintf("unrecognised CSD structure version %d\n", csd->csd_structure);
+        
+        return -RT_ERROR;
+      }
+      
+      csd->taac = GET_BITS(resp, 112, 8);
+      csd->nsac = GET_BITS(resp, 104, 8);
+      csd->tran_speed = GET_BITS(resp, 96, 8);
+      csd->card_cmd_class = GET_BITS(resp, 84, 12);
+      csd->rd_blk_len = GET_BITS(resp, 80, 4);
+      csd->rd_blk_part = GET_BITS(resp, 79, 1);
+      csd->wr_blk_misalign = GET_BITS(resp, 78, 1);
+      csd->rd_blk_misalign = GET_BITS(resp, 77, 1);
+      csd->dsr_imp = GET_BITS(resp, 76, 1);
+      csd->c_size = GET_BITS(resp, 62, 12);
+      csd->c_size_mult = GET_BITS(resp, 47, 3);
+      csd->r2w_factor = GET_BITS(resp, 26, 3);
+      csd->wr_blk_len = GET_BITS(resp, 22, 4);
+      csd->wr_blk_partial = GET_BITS(resp, 21, 1);
+      csd->csd_crc = GET_BITS(resp, 1, 7);
+      
+      card->card_blksize = 1 << csd->rd_blk_len;
+      card->tacc_clks = csd->nsac * 100;
+      card->tacc_ns = (tacc_uint[csd->taac&0x07] * tacc_value[(csd->taac&0x78)>>3] + 9) / 10;
+      card->max_data_rate = tran_unit[csd->tran_speed&0x07] * tran_value[(csd->tran_speed&0x78)>>3];
+      if (csd->wr_blk_len >= 9) {
+        a = GET_BITS(resp, 42, 5);
+        b = GET_BITS(resp, 37, 5);
+        card->erase_size = (a + 1) * (b + 1);
+        card->erase_size <<= csd->wr_blk_len - 9;
+      }
+      
+      return 0;
+}
+
+/*
+ * Read extended CSD.
+ */
+static int mmc_get_ext_csd(struct rt_mmcsd_card *card, rt_uint8_t **new_ext_csd)
+{
+  void *ext_csd;
+  struct rt_mmcsd_req req;
+  struct rt_mmcsd_cmd cmd;
+  struct rt_mmcsd_data data;
+  
+  *new_ext_csd = RT_NULL;
+  
+  if (GET_BITS(card->resp_cid, 122, 4) < 4)
+     return 0;
+  
+  /*
+  * As the ext_csd is so large and mostly unused, we don't store the
+  * raw block in mmc_card.
+  */
+  ext_csd = rt_malloc(512);
+  if (!ext_csd) {
+    rt_kprintf("alloc memory failed when get ext csd\n");
+    return -RT_ENOMEM;
+  }
+  
+  rt_memset(&req, 0, sizeof(struct rt_mmcsd_req));
+  rt_memset(&cmd, 0, sizeof(struct rt_mmcsd_cmd));
+  rt_memset(&data, 0, sizeof(struct rt_mmcsd_data));
+  
+  req.cmd = &cmd;
+  req.data = &data;
+  
+  cmd.cmd_code = SEND_EXT_CSD;
+  cmd.arg = 0;
+  
+  /* NOTE HACK:  the RESP_SPI_R1 is always correct here, but we
+  * rely on callers to never use this with "native" calls for reading
+  * CSD or CID.  Native versions of those commands use the R2 type,
+  * not R1 plus a data block.
+  */
+  cmd.flags = RESP_SPI_R1 | RESP_R1 | CMD_ADTC;
+  
+  data.blksize = 512;
+  data.blks = 1;
+  data.flags = DATA_DIR_READ;
+  data.buf = ext_csd;
+  
+  /*
+  * Some cards require longer data read timeout than indicated in CSD.
+  * Address this by setting the read timeout to a "reasonably high"
+  * value. For the cards tested, 300ms has proven enough. If necessary,
+  * this value can be increased if other problematic cards require this.
+  */
+  data.timeout_ns = 300000000;
+  data.timeout_clks = 0;
+  
+  mmcsd_send_request(card->host, &req);
+  
+  if (cmd.err)
+    return cmd.err;
+  if (data.err)
+    return data.err;
+  
+  *new_ext_csd = ext_csd;
+  return 0;
+}
+
+/*
+ * Decode extended CSD.
+ */
+static int mmc_parse_ext_csd(struct rt_mmcsd_card *card, rt_uint8_t *ext_csd)
+{
+  card->flags |=  CARD_FLAG_HIGHSPEED;
+  card->hs_max_data_rate = 200000000;
+  
+  card->card_capacity = *((rt_uint32_t *)&ext_csd[EXT_CSD_SEC_CNT]);
+  card->card_capacity *= card->card_blksize;
+  card->card_capacity >>= 10; /* unit:KB */
+  rt_kprintf("emmc card capacity %d KB\n", card->card_capacity);
+  
+  return 0;
+}
+
+/**
+ *   mmc_switch - modify EXT_CSD register
+ *   @card: the MMC card associated with the data transfer
+ *   @set: cmd set values
+ *   @index: EXT_CSD register index
+ *   @value: value to program into EXT_CSD register
+ *
+ *   Modifies the EXT_CSD register for selected card.
+ */
+static int mmc_switch(struct rt_mmcsd_card *card, rt_uint8_t set, 
+                      rt_uint8_t index, rt_uint8_t value)
+{
+  int err;
+  struct rt_mmcsd_host *host = card->host;
+  struct rt_mmcsd_cmd cmd = {0};
+  
+  cmd.cmd_code = SWITCH;
+  cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
+    (index << 16) | (value << 8) | set;
+  cmd.flags = RESP_SPI_R1 | RESP_R1 | CMD_AC;
+  
+  err = mmcsd_send_cmd(host, &cmd, 3);
+  if (err)
+    return err;
+  
+  return 0;
+}
+
+static int mmc_compare_ext_csds(struct rt_mmcsd_card *card, 
+                                rt_uint8_t *ext_csd, rt_uint32_t bus_width)
+{
+  rt_uint8_t *bw_ext_csd;
+  int err;
+  
+  if (bus_width == MMCSD_BUS_WIDTH_1)
+    return 0;
+  
+  err = mmc_get_ext_csd(card, &bw_ext_csd);
+  
+  if (err || bw_ext_csd == RT_NULL) {
+    err = -RT_ERROR;
+    goto out;
+  }
+  
+  /* only compare read only fields */
+  err = !((ext_csd[EXT_CSD_PARTITION_SUPPORT] == bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
+          (ext_csd[EXT_CSD_ERASED_MEM_CONT] == bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
+          (ext_csd[EXT_CSD_REV] == bw_ext_csd[EXT_CSD_REV]) &&
+          (ext_csd[EXT_CSD_STRUCTURE] == bw_ext_csd[EXT_CSD_STRUCTURE]) &&
+          (ext_csd[EXT_CSD_CARD_TYPE] == bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
+          (ext_csd[EXT_CSD_S_A_TIMEOUT] == bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
+          (ext_csd[EXT_CSD_HC_WP_GRP_SIZE] == bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
+          (ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT] == bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
+          (ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] == bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
+          (ext_csd[EXT_CSD_SEC_TRIM_MULT] == bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
+          (ext_csd[EXT_CSD_SEC_ERASE_MULT] == bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
+          (ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT] == bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
+          (ext_csd[EXT_CSD_TRIM_MULT] == bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
+          (ext_csd[EXT_CSD_SEC_CNT + 0] == bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
+          (ext_csd[EXT_CSD_SEC_CNT + 1] == bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
+          (ext_csd[EXT_CSD_SEC_CNT + 2] == bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
+          (ext_csd[EXT_CSD_SEC_CNT + 3] == bw_ext_csd[EXT_CSD_SEC_CNT + 3]) &&
+          (ext_csd[EXT_CSD_PWR_CL_52_195] == bw_ext_csd[EXT_CSD_PWR_CL_52_195]) &&
+          (ext_csd[EXT_CSD_PWR_CL_26_195] == bw_ext_csd[EXT_CSD_PWR_CL_26_195]) &&
+          (ext_csd[EXT_CSD_PWR_CL_52_360] == bw_ext_csd[EXT_CSD_PWR_CL_52_360]) &&
+          (ext_csd[EXT_CSD_PWR_CL_26_360] == bw_ext_csd[EXT_CSD_PWR_CL_26_360]) &&
+          (ext_csd[EXT_CSD_PWR_CL_200_195] == bw_ext_csd[EXT_CSD_PWR_CL_200_195]) &&
+          (ext_csd[EXT_CSD_PWR_CL_200_360] == bw_ext_csd[EXT_CSD_PWR_CL_200_360]) &&
+          (ext_csd[EXT_CSD_PWR_CL_DDR_52_195] == bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_195]) &&
+          (ext_csd[EXT_CSD_PWR_CL_DDR_52_360] == bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360]) &&
+          (ext_csd[EXT_CSD_PWR_CL_DDR_200_360] == bw_ext_csd[EXT_CSD_PWR_CL_DDR_200_360]));
+  
+  if (err)
+     err = -RT_ERROR;
+  
+out:
+  rt_free(bw_ext_csd);
+  return err;
+}
+
+/*
+ * Select the bus width amoung 4-bit and 8-bit(SDR).
+ * If the bus width is changed successfully, return the selected width value.
+ * Zero is returned instead of error value if the wide width is not supported.
+ */
+static int mmc_select_bus_width(struct rt_mmcsd_card *card, rt_uint8_t *ext_csd)
+{
+  rt_uint32_t ext_csd_bits[] = {
+    EXT_CSD_BUS_WIDTH_8,
+    EXT_CSD_BUS_WIDTH_4,
+    EXT_CSD_BUS_WIDTH_1
+  };
+  rt_uint32_t bus_widths[] = {
+    MMCSD_BUS_WIDTH_8,
+    MMCSD_BUS_WIDTH_4,
+    MMCSD_BUS_WIDTH_1
+  };
+  struct rt_mmcsd_host *host = card->host;
+  unsigned idx, bus_width = 0;
+  int err = 0;
+  
+  if (GET_BITS(card->resp_cid, 122, 4) < 4)
+     return 0;
+  
+  /*
+  * Unlike SD, MMC cards dont have a configuration register to notify
+  * supported bus width. So bus test command should be run to identify
+  * the supported bus width or compare the ext csd values of current
+  * bus width and ext csd values of 1 bit mode read earlier.
+  */
+  for (idx = 0; idx < sizeof(bus_widths)/sizeof(rt_uint32_t); idx++) {
+    /*
+    * Host is capable of 8bit transfer, then switch
+    * the device to work in 8bit transfer mode. If the
+    * mmc switch command returns error then switch to
+    * 4bit transfer mode. On success set the corresponding
+    * bus width on the host.
+    */
+    err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+                     EXT_CSD_BUS_WIDTH,
+                     ext_csd_bits[idx]);
+    if (err)
+      continue;
+    
+    bus_width = bus_widths[idx];
+    mmcsd_set_bus_width(host, bus_width);
+    mmcsd_delay_ms(20); //delay 10ms
+    err = mmc_compare_ext_csds(card, ext_csd, bus_width);
+    if (!err) {
+      err = bus_width;
+      break;
+    } else {
+      switch(ext_csd_bits[idx]){
+          case 0:
+            rt_kprintf("switch to bus width 1 bit failed\n");
+            break;
+          case 1:
+            rt_kprintf("switch to bus width 4 bit failed\n");
+            break;
+          case 2:
+            rt_kprintf("switch to bus width 8 bit failed\n");
+            break;
+          default:
+            break;
+      }
+    }
+  }
+  
+  return err;
+}
+rt_err_t mmc_send_op_cond(struct rt_mmcsd_host *host, 
+                          rt_uint32_t ocr, rt_uint32_t *rocr)
+{
+    struct rt_mmcsd_cmd cmd;
+    rt_uint32_t i;
+    rt_err_t err = RT_EOK;
+
+    rt_memset(&cmd, 0, sizeof(struct rt_mmcsd_cmd));
+    
+    cmd.cmd_code = SEND_OP_COND;
+    cmd.arg = controller_is_spi(host) ? 0 : ocr;
+    cmd.flags = RESP_SPI_R1 | RESP_R3 | CMD_BCR;
+  
+    for (i = 100; i; i--) {
+      err = mmcsd_send_cmd(host, &cmd, 3);
+      if (err)
+        break;
+      
+      /* if we're just probing, do a single pass */
+      if (ocr == 0)
+        break;
+      
+      /* otherwise wait until reset completes */
+      if (controller_is_spi(host)) {
+        if (!(cmd.resp[0] & R1_SPI_IDLE))
+          break;
+      } else {
+        if (cmd.resp[0] & CARD_BUSY)
+          break;
+      }
+      
+      err = -RT_ETIMEOUT;
+      
+      mmcsd_delay_ms(10); //delay 10ms
+    }
+  
+  if (rocr && !controller_is_spi(host))
+    *rocr = cmd.resp[0];
+  
+  return err;
+}
+
+static rt_err_t mmc_set_card_addr(struct rt_mmcsd_host *host, rt_uint32_t rca)
+{
+  rt_err_t err;
+  struct rt_mmcsd_cmd cmd;
+  
+  rt_memset(&cmd, 0, sizeof(struct rt_mmcsd_cmd));
+  
+  cmd.cmd_code = SET_RELATIVE_ADDR;
+  cmd.arg = rca << 16;
+  cmd.flags = RESP_R1 | CMD_AC;
+  
+  err = mmcsd_send_cmd(host, &cmd, 3);
+  if (err)
+    return err;
+  
+  return 0;
+}
+
+static rt_int32_t mmcsd_mmc_init_card(struct rt_mmcsd_host *host,
+                                     rt_uint32_t           ocr)
+{
+    struct rt_mmcsd_card *card;
+    rt_int32_t err;
+    rt_uint32_t resp[4];
+    rt_uint32_t rocr;
+    rt_uint32_t max_data_rate;
+    rt_uint8_t *ext_csd = RT_NULL;
+
+    mmcsd_go_idle(host);
+    
+    /* The extra bit indicates that we support high capacity */
+    err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
+    if (err)
+      goto err;
+    
+    if (controller_is_spi(host)) 
+    {
+        err = mmcsd_spi_use_crc(host, 1);
+        if (err)
+            goto err1;
+    }
+    
+    if (controller_is_spi(host))
+        err = mmcsd_get_cid(host, resp);
+    else
+        err = mmcsd_all_get_cid(host, resp);
+    if (err)
+        goto err;
+
+    card = rt_malloc(sizeof(struct rt_mmcsd_card));
+    if (!card) 
+    {
+        rt_kprintf("malloc card failed\n");
+        err = -RT_ENOMEM;
+        goto err;
+    }
+    rt_memset(card, 0, sizeof(struct rt_mmcsd_card));
+
+    card->card_type = CARD_TYPE_MMC;
+    card->host = host;
+    card->rca = 1;
+    rt_memcpy(card->resp_cid, resp, sizeof(card->resp_cid));
+
+    /*
+     * For native busses:  get card RCA and quit open drain mode.
+     */
+    if (!controller_is_spi(host)) 
+    {
+        err = mmc_set_card_addr(host, card->rca);
+        if (err)
+            goto err1;
+
+        mmcsd_set_bus_mode(host, MMCSD_BUSMODE_PUSHPULL);
+    }
+
+    err = mmcsd_get_csd(card, card->resp_csd);
+    if (err)
+        goto err1;
+
+    err = mmcsd_parse_csd(card);
+    if (err)
+        goto err1;
+
+    if (!controller_is_spi(host)) 
+    {
+        err = mmcsd_select_card(card);
+        if (err)
+            goto err1;
+    }
+    
+    /*
+    * Fetch and process extended CSD.
+    */
+    
+    err = mmc_get_ext_csd(card, &ext_csd);
+    if (err)
+      goto err1;
+    err = mmc_parse_ext_csd(card, ext_csd);
+    if (err)
+      goto err1;
+    
+    /* If doing byte addressing, check if required to do sector
+    * addressing.  Handle the case of <2GB cards needing sector
+    * addressing.  See section 8.1 JEDEC Standard JED84-A441;
+    * ocr register has bit 30 set for sector addressing.
+    */
+    if (!(card->flags & CARD_FLAG_SDHC) && (rocr & (1<<30)))
+        card->flags |= CARD_FLAG_SDHC;
+ 
+    /* set bus speed */
+    max_data_rate = (unsigned int)-1;
+    if (card->flags & CARD_FLAG_HIGHSPEED) 
+    {
+        if (max_data_rate > card->hs_max_data_rate)
+            max_data_rate = card->hs_max_data_rate;
+    } 
+    else if (max_data_rate > card->max_data_rate) 
+    {
+        max_data_rate = card->max_data_rate;
+    }
+
+    mmcsd_set_clock(host, max_data_rate);
+
+    /*switch bus width*/
+    mmc_select_bus_width(card, ext_csd);
+    
+    host->card = card;
+
+    rt_free(ext_csd);
+    return 0;
+
+err1:
+    rt_free(card);
+err:
+
+    return err;
+}
+
+/*
+ * Starting point for mmc card init.
+ */
+rt_int32_t init_mmc(struct rt_mmcsd_host *host, rt_uint32_t ocr)
+{
+    rt_int32_t err;
+    rt_uint32_t  current_ocr;
+    /*
+     * We need to get OCR a different way for SPI.
+     */
+    if (controller_is_spi(host))
+    {
+        err = mmcsd_spi_read_ocr(host, 0, &ocr);
+        if (err)
+            goto err;
+    }
+
+    current_ocr = mmcsd_select_voltage(host, ocr);
+
+    /*
+     * Can we support the voltage(s) of the card(s)?
+     */
+    if (!current_ocr)
+    {
+        err = -RT_ERROR;
+        goto err;
+    }
+
+    /*
+     * Detect and init the card.
+     */
+    err = mmcsd_mmc_init_card(host, current_ocr);
+    if (err)
+        goto err;
+
+    mmcsd_host_unlock(host);
+
+    err = rt_mmcsd_blk_probe(host->card);
+    if (err)
+        goto remove_card;
+    mmcsd_host_lock(host);
+
+    return 0;
+
+remove_card:
+    mmcsd_host_lock(host);
+    rt_mmcsd_blk_remove(host->card);
+    rt_free(host->card);
+    host->card = RT_NULL;
+err:
+
+    rt_kprintf("init SD card failed\n");
+
+    return err;
+}
diff --git a/components/drivers/sdio/mmcsd_core.c b/components/drivers/sdio/mmcsd_core.c
index 816782f68c..90599dca1f 100644
--- a/components/drivers/sdio/mmcsd_core.c
+++ b/components/drivers/sdio/mmcsd_core.c
@@ -25,6 +25,7 @@
 #include <rtthread.h>
 #include <drivers/mmcsd_core.h>
 #include <drivers/sd.h>
+#include <drivers/mmc.h>
 
 #ifndef RT_MMCSD_STACK_SIZE
 #define RT_MMCSD_STACK_SIZE 1024
@@ -60,22 +61,29 @@ void mmcsd_req_complete(struct rt_mmcsd_host *host)
 
 void mmcsd_send_request(struct rt_mmcsd_host *host, struct rt_mmcsd_req *req)
 {
-    req->cmd->err = 0;
-    req->cmd->mrq = req;
-    if (req->data)
-    {   
-        req->cmd->data = req->data;
-        req->data->err = 0;
-        req->data->mrq = req;
-        if (req->stop)
-        {
-            req->data->stop = req->stop;
-            req->stop->err = 0;
-            req->stop->mrq = req;
-        }       
-   }
-    host->ops->request(host, req);
-    rt_sem_take(&host->sem_ack, RT_WAITING_FOREVER);
+    do {
+        req->cmd->retries--;
+        req->cmd->err = 0;
+        req->cmd->mrq = req;
+        if (req->data)
+        {   
+            req->cmd->data = req->data;
+            req->data->err = 0;
+            req->data->mrq = req;
+            if (req->stop)
+            {
+                req->data->stop = req->stop;
+                req->stop->err = 0;
+                req->stop->mrq = req;
+            }       
+        }
+        host->ops->request(host, req);
+
+        rt_sem_take(&host->sem_ack, RT_WAITING_FOREVER);
+          
+    } while(req->cmd->err && req->cmd->retries);
+
+
 }
 
 rt_int32_t mmcsd_send_cmd(struct rt_mmcsd_host *host,
@@ -86,6 +94,7 @@ rt_int32_t mmcsd_send_cmd(struct rt_mmcsd_host *host,
 
     rt_memset(&req, 0, sizeof(struct rt_mmcsd_req));
     rt_memset(cmd->resp, 0, sizeof(cmd->resp));
+    cmd->retries = retries;
 
     req.cmd = cmd;
     cmd->data = RT_NULL;
@@ -626,6 +635,18 @@ void mmcsd_detect(void *param)
                     mmcsd_host_unlock(host);
                     continue;
                 }
+                
+                /*
+                 * detect mmc card
+                 */
+                err = mmc_send_op_cond(host, 0, &ocr);
+                if (!err) 
+                {
+                    if (init_mmc(host, ocr))
+                        mmcsd_power_off(host);
+                    mmcsd_host_unlock(host);
+                    continue;
+                }
                 mmcsd_host_unlock(host);
             }
         }