rt-thread-official/components/drivers/sdio/block_dev.c

/*
 * Copyright (c) 2006-2023, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author        Notes
 * 2011-07-25     weety     first version
 */

#include <rtthread.h>
#include <dfs_fs.h>
#include <dfs_file.h>

#include <drivers/mmcsd_core.h>
#include <drivers/gpt.h>

#define DBG_TAG               "SDIO"
#ifdef RT_SDIO_DEBUG
#define DBG_LVL               DBG_LOG
#else
#define DBG_LVL               DBG_INFO
#endif /* RT_SDIO_DEBUG */
#include <rtdbg.h>

static rt_list_t blk_devices = RT_LIST_OBJECT_INIT(blk_devices);

#define BLK_MIN(a, b) ((a) < (b) ? (a) : (b))
#define RT_DEVICE_CTRL_BLK_SSIZEGET      0x1268                                     /**< get number of bytes per sector */
#define RT_DEVICE_CTRL_ALL_BLK_SSIZEGET  0x80081272                                 /**< get number of bytes per sector * sector counts*/

struct mmcsd_blk_device
{
    struct rt_mmcsd_card *card;
    rt_list_t list;
    struct rt_device dev;
    struct dfs_partition part;
    struct rt_device_blk_geometry geometry;
    rt_size_t max_req_size;
};

#ifndef RT_MMCSD_MAX_PARTITION
#define RT_MMCSD_MAX_PARTITION 16
#endif
#define RT_GPT_PARTITION_MAX 128

static int __send_status(struct rt_mmcsd_card *card, rt_uint32_t *status, unsigned retries)
{
    int err;
    struct rt_mmcsd_cmd cmd;

    cmd.busy_timeout = 0;
    cmd.cmd_code = SEND_STATUS;
    cmd.arg = card->rca << 16;
    cmd.flags = RESP_R1 | CMD_AC;
    err = mmcsd_send_cmd(card->host, &cmd, retries);
    if (err)
        return err;

    if (status)
        *status = cmd.resp[0];

    return 0;
}

static int card_busy_detect(struct rt_mmcsd_card *card, unsigned int timeout_ms,
                            rt_uint32_t *resp_errs)
{
    int timeout = rt_tick_from_millisecond(timeout_ms);
    int err = 0;
    rt_uint32_t status;
    rt_tick_t start;

    start = rt_tick_get();
    do
    {
        rt_bool_t out = (int)(rt_tick_get() - start) > timeout;

        err = __send_status(card, &status, 5);
        if (err)
        {
            LOG_E("error %d requesting status", err);
            return err;
        }

        /* Accumulate any response error bits seen */
        if (resp_errs)
            *resp_errs |= status;

        if (out)
        {
            LOG_E("wait card busy timeout");
            return -RT_ETIMEOUT;
        }
        /*
         * Some cards mishandle the status bits,
         * so make sure to check both the busy
         * indication and the card state.
         */
    }
    while (!(status & R1_READY_FOR_DATA) ||
            (R1_CURRENT_STATE(status) == 7));

    return err;
}

rt_int32_t mmcsd_num_wr_blocks(struct rt_mmcsd_card *card)
{
    rt_int32_t err;
    rt_uint32_t blocks;

    struct rt_mmcsd_req req;
    struct rt_mmcsd_cmd cmd;
    struct rt_mmcsd_data data;
    rt_uint32_t timeout_us;

    rt_memset(&cmd, 0, sizeof(struct rt_mmcsd_cmd));

    cmd.cmd_code = APP_CMD;
    cmd.arg = card->rca << 16;
    cmd.flags = RESP_SPI_R1 | RESP_R1 | CMD_AC;

    err = mmcsd_send_cmd(card->host, &cmd, 0);
    if (err)
        return -RT_ERROR;
    if (!controller_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
        return -RT_ERROR;

    rt_memset(&cmd, 0, sizeof(struct rt_mmcsd_cmd));

    cmd.cmd_code = SD_APP_SEND_NUM_WR_BLKS;
    cmd.arg = 0;
    cmd.flags = RESP_SPI_R1 | RESP_R1 | CMD_ADTC;

    rt_memset(&data, 0, sizeof(struct rt_mmcsd_data));

    data.timeout_ns = card->tacc_ns * 100;
    data.timeout_clks = card->tacc_clks * 100;

    timeout_us = data.timeout_ns / 1000;
    timeout_us += data.timeout_clks * 1000 /
                  (card->host->io_cfg.clock / 1000);

    if (timeout_us > 100000)
    {
        data.timeout_ns = 100000000;
        data.timeout_clks = 0;
    }

    data.blksize = 4;
    data.blks = 1;
    data.flags = DATA_DIR_READ;
    data.buf = &blocks;

    rt_memset(&req, 0, sizeof(struct rt_mmcsd_req));

    req.cmd = &cmd;
    req.data = &data;

    mmcsd_send_request(card->host, &req);

    if (cmd.err || data.err)
        return -RT_ERROR;

    return blocks;
}

static rt_err_t rt_mmcsd_req_blk(struct rt_mmcsd_card *card,
                                 rt_uint32_t           sector,
                                 void                 *buf,
                                 rt_size_t             blks,
                                 rt_uint8_t            dir)
{
    struct rt_mmcsd_cmd  cmd, stop;
    struct rt_mmcsd_data  data;
    struct rt_mmcsd_req  req;
    struct rt_mmcsd_host *host = card->host;
    rt_uint32_t r_cmd, w_cmd;

    mmcsd_host_lock(host);
    rt_memset(&req, 0, sizeof(struct rt_mmcsd_req));
    rt_memset(&cmd, 0, sizeof(struct rt_mmcsd_cmd));
    rt_memset(&stop, 0, sizeof(struct rt_mmcsd_cmd));
    rt_memset(&data, 0, sizeof(struct rt_mmcsd_data));
    req.cmd = &cmd;
    req.data = &data;

    cmd.arg = sector;
    if (!(card->flags & CARD_FLAG_SDHC))
    {
        cmd.arg <<= 9;
    }
    cmd.flags = RESP_SPI_R1 | RESP_R1 | CMD_ADTC;

    data.blksize = SECTOR_SIZE;
    data.blks  = blks;

    if (blks > 1)
    {
        if (!controller_is_spi(card->host) || !dir)
        {
            req.stop = &stop;
            stop.cmd_code = STOP_TRANSMISSION;
            stop.arg = 0;
            stop.flags = RESP_SPI_R1B | RESP_R1B | CMD_AC;
        }
        r_cmd = READ_MULTIPLE_BLOCK;
        w_cmd = WRITE_MULTIPLE_BLOCK;
    }
    else
    {
        req.stop = RT_NULL;
        r_cmd = READ_SINGLE_BLOCK;
        w_cmd = WRITE_BLOCK;
    }

    if (!controller_is_spi(card->host) && (card->flags & 0x8000))
    {
        /* last request is WRITE,need check busy */
        card_busy_detect(card, 10000, RT_NULL);
    }

    if (!dir)
    {
        cmd.cmd_code = r_cmd;
        data.flags |= DATA_DIR_READ;
        card->flags &= 0x7fff;
    }
    else
    {
        cmd.cmd_code = w_cmd;
        data.flags |= DATA_DIR_WRITE;
        card->flags |= 0x8000;
    }

    mmcsd_set_data_timeout(&data, card);
    data.buf = buf;

    mmcsd_send_request(host, &req);

    mmcsd_host_unlock(host);

    if (cmd.err || data.err || stop.err)
    {
        LOG_E("mmcsd request blocks error");
        LOG_E("%d,%d,%d, 0x%08x,0x%08x",
              cmd.err, data.err, stop.err, data.flags, sector);

        return -RT_ERROR;
    }

    return RT_EOK;
}

static rt_err_t rt_mmcsd_init(rt_device_t dev)
{
    return RT_EOK;
}

static rt_err_t rt_mmcsd_open(rt_device_t dev, rt_uint16_t oflag)
{
    return RT_EOK;
}

static rt_err_t rt_mmcsd_close(rt_device_t dev)
{
    return RT_EOK;
}

static rt_err_t rt_mmcsd_control(rt_device_t dev, int cmd, void *args)
{
    struct mmcsd_blk_device *blk_dev = (struct mmcsd_blk_device *)dev->user_data;

    switch (cmd)
    {
    case RT_DEVICE_CTRL_BLK_GETGEOME:
        rt_memcpy(args, &blk_dev->geometry, sizeof(struct rt_device_blk_geometry));
        break;
    case RT_DEVICE_CTRL_BLK_PARTITION:
        rt_memcpy(args, &blk_dev->part, sizeof(struct dfs_partition));
        break;
    case RT_DEVICE_CTRL_BLK_SSIZEGET:
        rt_memcpy(args, &blk_dev->geometry.bytes_per_sector, sizeof(rt_uint32_t));
        break;
    case RT_DEVICE_CTRL_ALL_BLK_SSIZEGET:
    {
        rt_uint64_t count_mul_per = blk_dev->geometry.bytes_per_sector * blk_dev->geometry.sector_count;
        rt_memcpy(args, &count_mul_per, sizeof(rt_uint64_t));
    }
        break;
    default:
        break;
    }
    return RT_EOK;
}

static rt_ssize_t rt_mmcsd_read(rt_device_t dev,
                               rt_off_t    pos,
                               void       *buffer,
                               rt_size_t   size)
{
    rt_err_t err = 0;
    rt_size_t offset = 0;
    rt_size_t req_size = 0;
    rt_size_t remain_size = size;
    void *rd_ptr = (void *)buffer;
    struct mmcsd_blk_device *blk_dev = (struct mmcsd_blk_device *)dev->user_data;
    struct dfs_partition *part = &blk_dev->part;

    if (dev == RT_NULL)
    {
        rt_set_errno(-EINVAL);
        return 0;
    }

    rt_sem_take(part->lock, RT_WAITING_FOREVER);
    while (remain_size)
    {
        req_size = (remain_size > blk_dev->max_req_size) ? blk_dev->max_req_size : remain_size;
        err = rt_mmcsd_req_blk(blk_dev->card, part->offset + pos + offset, rd_ptr, req_size, 0);
        if (err)
            break;
        offset += req_size;
        rd_ptr = (void *)((rt_uint8_t *)rd_ptr + (req_size << 9));
        remain_size -= req_size;
    }
    rt_sem_release(part->lock);

    /* the length of reading must align to SECTOR SIZE */
    if (err)
    {
        rt_set_errno(-EIO);
        return 0;
    }
    return size - remain_size;
}

static rt_ssize_t rt_mmcsd_write(rt_device_t dev,
                                rt_off_t    pos,
                                const void *buffer,
                                rt_size_t   size)
{
    rt_err_t err = 0;
    rt_size_t offset = 0;
    rt_size_t req_size = 0;
    rt_size_t remain_size = size;
    void *wr_ptr = (void *)buffer;
    struct mmcsd_blk_device *blk_dev = (struct mmcsd_blk_device *)dev->user_data;
    struct dfs_partition *part = &blk_dev->part;

    if (dev == RT_NULL)
    {
        rt_set_errno(-EINVAL);
        return 0;
    }

    rt_sem_take(part->lock, RT_WAITING_FOREVER);
    while (remain_size)
    {
        req_size = (remain_size > blk_dev->max_req_size) ? blk_dev->max_req_size : remain_size;
        err = rt_mmcsd_req_blk(blk_dev->card, part->offset + pos + offset, wr_ptr, req_size, 1);
        if (err)
            break;
        offset += req_size;
        wr_ptr = (void *)((rt_uint8_t *)wr_ptr + (req_size << 9));
        remain_size -= req_size;
    }
    rt_sem_release(part->lock);

    /* the length of reading must align to SECTOR SIZE */
    if (err)
    {
        rt_set_errno(-EIO);

        return 0;
    }
    return size - remain_size;
}

static rt_int32_t mmcsd_set_blksize(struct rt_mmcsd_card *card)
{
    struct rt_mmcsd_cmd cmd;
    int err;

    /* Block-addressed cards ignore MMC_SET_BLOCKLEN. */
    if (card->flags & CARD_FLAG_SDHC)
        return 0;

    mmcsd_host_lock(card->host);
    cmd.cmd_code = SET_BLOCKLEN;
    cmd.arg = 512;
    cmd.flags = RESP_SPI_R1 | RESP_R1 | CMD_AC;
    err = mmcsd_send_cmd(card->host, &cmd, 5);
    mmcsd_host_unlock(card->host);

    if (err)
    {
        LOG_E("MMCSD: unable to set block size to %d: %d", cmd.arg, err);

        return -RT_ERROR;
    }

    return 0;
}
rt_int32_t read_lba(struct rt_mmcsd_card *card, size_t lba, uint8_t *buffer, size_t count)
{
    rt_uint8_t status = 0;

    status = mmcsd_set_blksize(card);
    if (status)
    {
        return status;
    }
    rt_thread_mdelay(1);
    status = rt_mmcsd_req_blk(card, lba, buffer, count, 0);
    return status;
}

#ifdef RT_USING_DEVICE_OPS
const static struct rt_device_ops mmcsd_blk_ops =
{
    rt_mmcsd_init,
    rt_mmcsd_open,
    rt_mmcsd_close,
    rt_mmcsd_read,
    rt_mmcsd_write,
    rt_mmcsd_control
};
#endif

#ifdef RT_USING_DFS_V2

static ssize_t rt_mmcsd_fops_read(struct dfs_file *file, void *buf, size_t count, off_t *pos)
{
    int result = 0;
    rt_device_t dev = (rt_device_t)file->vnode->data;
    struct mmcsd_blk_device *blk_dev = (struct mmcsd_blk_device *)dev->user_data;
    int bytes_per_sector = blk_dev->geometry.bytes_per_sector;
    int blk_pos = *pos / bytes_per_sector;
    int first_offs = *pos % bytes_per_sector;
    char *rbuf;
    int rsize = 0;

    rbuf = rt_malloc(bytes_per_sector);
    if (!rbuf)
    {
        return 0;
    }

    /*
    ** #1: read first unalign block size.
    */
    result = rt_mmcsd_read(dev, blk_pos, rbuf, 1);
    if (result != 1)
    {
        rt_free(rbuf);
        return 0;
    }

    if (count > bytes_per_sector - first_offs)
    {
        rsize = bytes_per_sector - first_offs;
    }
    else
    {
        rsize = count;
    }
    rt_memcpy(buf, rbuf + first_offs, rsize);
    blk_pos++;

    /*
    ** #2: read continuous block size.
    */
    while (rsize < count)
    {
        result = rt_mmcsd_read(dev, blk_pos++, rbuf, 1);
        if (result != 1)
        {
            break;
        }

        if (count - rsize >= bytes_per_sector)
        {
            rt_memcpy(buf + rsize, rbuf, bytes_per_sector);
            rsize += bytes_per_sector;
        }
        else
        {
            rt_memcpy(buf + rsize, rbuf, count - rsize);
            rsize = count;
        }
    }

    rt_free(rbuf);
    *pos += rsize;

    return rsize;
}

static int rt_mmcsd_fops_ioctl(struct dfs_file *file, int cmd, void *arg)
{
    rt_device_t dev = (rt_device_t)file->vnode->data;

    return rt_mmcsd_control(dev,cmd,arg);
}

static int rt_mmcsd_fops_open(struct dfs_file *file)
{
    rt_device_t dev = (rt_device_t)file->vnode->data;
    rt_mmcsd_control(dev, RT_DEVICE_CTRL_ALL_BLK_SSIZEGET, &file->vnode->size);
    return RT_EOK;
}

static int rt_mmcsd_fops_close(struct dfs_file *file)
{
    return RT_EOK;
}

static ssize_t rt_mmcsd_fops_write(struct dfs_file *file, const void *buf, size_t count, off_t *pos)
{
    int result = 0;
    rt_device_t dev = (rt_device_t)file->vnode->data;
    struct mmcsd_blk_device *blk_dev = (struct mmcsd_blk_device *)dev->user_data;
    int bytes_per_sector = blk_dev->geometry.bytes_per_sector;
    int blk_pos = *pos / bytes_per_sector;
    int first_offs = *pos % bytes_per_sector;
    char *rbuf = 0;
    int wsize = 0;

    /*
    ** #1: write first unalign block size.
    */
    if (first_offs != 0)
    {
        if (count > bytes_per_sector - first_offs)
        {
            wsize = bytes_per_sector - first_offs;
        }
        else
        {
            wsize = count;
        }

        rbuf = rt_malloc(bytes_per_sector);
        if (!rbuf)
        {
            return 0;
        }

        result = rt_mmcsd_read(dev, blk_pos, rbuf, 1);
        if (result != 1)
        {
            rt_free(rbuf);
            return 0;
        }

        rt_memcpy(rbuf + first_offs, buf, wsize);
        result = rt_mmcsd_write(dev, blk_pos, rbuf, 1);
        if (result != 1)
        {
            rt_free(rbuf);
            return 0;
        }
        rt_free(rbuf);
        blk_pos += 1;
    }

    /*
    ** #2: write continuous block size.
    */
    if ((count - wsize) / bytes_per_sector != 0)
    {
        result = rt_mmcsd_write(dev, blk_pos, buf + wsize, (count - wsize) / bytes_per_sector);
        wsize += result * bytes_per_sector;
        blk_pos += result;
        if (result != (count - wsize) / bytes_per_sector)
        {
            *pos += wsize;
            return wsize;
        }
    }

    /*
    ** # 3: write last unalign block size.
    */
    if ((count - wsize) != 0)
    {
        rbuf = rt_malloc(bytes_per_sector);
        if (rbuf != RT_NULL)
        {
            result = rt_mmcsd_read(dev, blk_pos, rbuf, 1);
            if (result == 1)
            {
                rt_memcpy(rbuf, buf + wsize, count - wsize);
                result = rt_mmcsd_write(dev, blk_pos, rbuf, 1);
                if (result == 1)
                {
                    wsize += count - wsize;
                }
            }

            rt_free(rbuf);
        }
    }

    *pos += wsize;
    return wsize;
}

static int rt_mmcsd_fops_poll(struct dfs_file *file, struct rt_pollreq *req)
{
    int mask = 0;

    return mask;
}

const static struct dfs_file_ops mmcsd_blk_fops =
{
    rt_mmcsd_fops_open,
    rt_mmcsd_fops_close,
    rt_mmcsd_fops_ioctl,
    rt_mmcsd_fops_read,
    rt_mmcsd_fops_write,
    RT_NULL,
    generic_dfs_lseek,
    RT_NULL,
    RT_NULL,
    rt_mmcsd_fops_poll
};
#endif

rt_int32_t gpt_device_probe(struct rt_mmcsd_card *card)
{
    rt_int32_t err = RT_EOK;
    rt_uint8_t i, status;
    char dname[10];
    char sname[16];
    struct mmcsd_blk_device *blk_dev = RT_NULL;

    blk_dev = rt_calloc(1, sizeof(struct mmcsd_blk_device));
    if (!blk_dev)
    {
        LOG_E("mmcsd:malloc memory failed!");
        return -1;
    }

    blk_dev->max_req_size = BLK_MIN((card->host->max_dma_segs *
                                     card->host->max_seg_size) >> 9,
                                    (card->host->max_blk_count *
                                     card->host->max_blk_size) >> 9);
    blk_dev->part.offset = 0;
    blk_dev->part.size   = 0;
    rt_snprintf(sname, sizeof(sname) - 1, "sem_%s%d", card->host->name, 0);
    blk_dev->part.lock = rt_sem_create(sname, 1, RT_IPC_FLAG_FIFO);
    /* register mmcsd device */
    blk_dev->dev.type  = RT_Device_Class_Block;
#ifdef RT_USING_DEVICE_OPS
    blk_dev->dev.ops  = &mmcsd_blk_ops;
#else
    blk_dev->dev.init = rt_mmcsd_init;
    blk_dev->dev.open = rt_mmcsd_open;
    blk_dev->dev.close = rt_mmcsd_close;
    blk_dev->dev.read = rt_mmcsd_read;
    blk_dev->dev.write = rt_mmcsd_write;
    blk_dev->dev.control = rt_mmcsd_control;
#endif
    blk_dev->card = card;

    blk_dev->geometry.bytes_per_sector = 1 << 9;
    blk_dev->geometry.block_size = card->card_blksize;
    blk_dev->geometry.sector_count =
        card->card_capacity * (1024 / 512);

    blk_dev->dev.user_data = blk_dev;

    rt_device_register(&(blk_dev->dev), card->host->name,
                       RT_DEVICE_FLAG_RDWR);
#ifdef RT_USING_POSIX_DEVIO
#ifdef RT_USING_DFS_V2
    blk_dev->dev.fops  = &mmcsd_blk_fops;
#endif
#endif
    rt_list_insert_after(&blk_devices, &blk_dev->list);

    for (i = 0; i < RT_GPT_PARTITION_MAX; i++)
    {
        blk_dev = rt_calloc(1, sizeof(struct mmcsd_blk_device));
        if (!blk_dev)
        {
            LOG_E("mmcsd:malloc memory failed!");
            break;
        }
        blk_dev->max_req_size = BLK_MIN((card->host->max_dma_segs *
                                         card->host->max_seg_size) >> 9,
                                        (card->host->max_blk_count *
                                         card->host->max_blk_size) >> 9);

        /* get the first partition */
        status = gpt_get_partition_param(card, &blk_dev->part, i);
        if (status == RT_EOK)
        {
            rt_snprintf(dname, sizeof(dname) - 1, "%s%d", card->host->name, i);
            rt_snprintf(sname, sizeof(sname) - 1, "sem_%s%d", card->host->name, i + 1);
            blk_dev->part.lock = rt_sem_create(sname, 1, RT_IPC_FLAG_FIFO);

            /* register mmcsd device */
            blk_dev->dev.type = RT_Device_Class_Block;
#ifdef RT_USING_DEVICE_OPS
            blk_dev->dev.ops  = &mmcsd_blk_ops;
#else
            blk_dev->dev.init = rt_mmcsd_init;
            blk_dev->dev.open = rt_mmcsd_open;
            blk_dev->dev.close = rt_mmcsd_close;
            blk_dev->dev.read = rt_mmcsd_read;
            blk_dev->dev.write = rt_mmcsd_write;
            blk_dev->dev.control = rt_mmcsd_control;
#endif
            blk_dev->card = card;

            blk_dev->geometry.bytes_per_sector = 1 << 9;
            blk_dev->geometry.block_size = card->card_blksize;
            blk_dev->geometry.sector_count = blk_dev->part.size;

            blk_dev->dev.user_data = blk_dev;

            rt_device_register(&(blk_dev->dev), dname,
                               RT_DEVICE_FLAG_RDWR);
#ifdef RT_USING_POSIX_DEVIO
#ifdef RT_USING_DFS_V2
            blk_dev->dev.fops  = &mmcsd_blk_fops;
#endif
#endif
            rt_list_insert_after(&blk_devices, &blk_dev->list);
        }
        else
        {
            rt_free(blk_dev);
            blk_dev = RT_NULL;
            break;
        }

#ifdef RT_USING_DFS_MNTTABLE
        if (blk_dev)
        {
            LOG_I("try to mount file system!");
            /* try to mount file system on this block device */
            dfs_mount_device(&(blk_dev->dev));
        }
#endif
    }
    gpt_free();

    return err;
}

rt_int32_t mbr_device_probe(struct rt_mmcsd_card *card)
{
    rt_int32_t err = 0;
    rt_uint8_t i, status;
    rt_uint8_t *sector;
    char dname[10];
    char sname[16];
    struct mmcsd_blk_device *blk_dev = RT_NULL;

    err = mmcsd_set_blksize(card);
    if (err)
    {
        return err;
    }
    rt_thread_mdelay(1);
    /* get the first sector to read partition table */
    sector = (rt_uint8_t *)rt_malloc(SECTOR_SIZE);
    if (sector == RT_NULL)
    {
        LOG_E("allocate partition sector buffer failed!");

        return -RT_ENOMEM;
    }

    status = rt_mmcsd_req_blk(card, 0, sector, 1, 0);
    if (status == RT_EOK)
    {
        blk_dev = rt_calloc(1, sizeof(struct mmcsd_blk_device));
        if (!blk_dev)
        {
            LOG_E("mmcsd:malloc memory failed!");
            return -1;
        }
        blk_dev->max_req_size = BLK_MIN((card->host->max_dma_segs *
                                         card->host->max_seg_size) >> 9,
                                        (card->host->max_blk_count *
                                         card->host->max_blk_size) >> 9);
        blk_dev->part.offset = 0;
        blk_dev->part.size   = 0;
        rt_snprintf(sname, sizeof(sname) - 1, "sem_%s%d", card->host->name, 0);
        blk_dev->part.lock = rt_sem_create(sname, 1, RT_IPC_FLAG_FIFO);
        /* register mmcsd device */
        blk_dev->dev.type  = RT_Device_Class_Block;
#ifdef RT_USING_DEVICE_OPS
        blk_dev->dev.ops  = &mmcsd_blk_ops;
#else
        blk_dev->dev.init = rt_mmcsd_init;
        blk_dev->dev.open = rt_mmcsd_open;
        blk_dev->dev.close = rt_mmcsd_close;
        blk_dev->dev.read = rt_mmcsd_read;
        blk_dev->dev.write = rt_mmcsd_write;
        blk_dev->dev.control = rt_mmcsd_control;
#endif
        blk_dev->card = card;

        blk_dev->geometry.bytes_per_sector = 1 << 9;
        blk_dev->geometry.block_size = card->card_blksize;
        blk_dev->geometry.sector_count =
            card->card_capacity * (1024 / 512);

        blk_dev->dev.user_data = blk_dev;

        rt_device_register(&(blk_dev->dev), card->host->name,
                           RT_DEVICE_FLAG_RDWR);
        rt_list_insert_after(&blk_devices, &blk_dev->list);
        for (i = 0; i < RT_MMCSD_MAX_PARTITION; i++)
        {
            blk_dev = rt_calloc(1, sizeof(struct mmcsd_blk_device));
            if (!blk_dev)
            {
                LOG_E("mmcsd:malloc memory failed!");
                break;
            }
            blk_dev->max_req_size = BLK_MIN((card->host->max_dma_segs *
                                             card->host->max_seg_size) >> 9,
                                            (card->host->max_blk_count *
                                             card->host->max_blk_size) >> 9);

            /* get the first partition */
            status = dfs_filesystem_get_partition(&blk_dev->part, sector, i);
            if (status == RT_EOK)
            {
                rt_snprintf(dname, sizeof(dname) - 1, "%s%d", card->host->name, i);
                rt_snprintf(sname, sizeof(sname) - 1, "sem_%s%d", card->host->name, i + 1);
                blk_dev->part.lock = rt_sem_create(sname, 1, RT_IPC_FLAG_FIFO);

                /* register mmcsd device */
                blk_dev->dev.type = RT_Device_Class_Block;
#ifdef RT_USING_DEVICE_OPS
                blk_dev->dev.ops  = &mmcsd_blk_ops;
#else
                blk_dev->dev.init = rt_mmcsd_init;
                blk_dev->dev.open = rt_mmcsd_open;
                blk_dev->dev.close = rt_mmcsd_close;
                blk_dev->dev.read = rt_mmcsd_read;
                blk_dev->dev.write = rt_mmcsd_write;
                blk_dev->dev.control = rt_mmcsd_control;
#endif
                blk_dev->card = card;

                blk_dev->geometry.bytes_per_sector = 1 << 9;
                blk_dev->geometry.block_size = card->card_blksize;
                blk_dev->geometry.sector_count = blk_dev->part.size;

                blk_dev->dev.user_data = blk_dev;

                rt_device_register(&(blk_dev->dev), dname,
                                   RT_DEVICE_FLAG_RDWR);
                rt_list_insert_after(&blk_devices, &blk_dev->list);
            }
            else
            {
                rt_free(blk_dev);
                blk_dev = RT_NULL;
                break;
            }

#ifdef RT_USING_DFS_MNTTABLE
            if (blk_dev)
            {
                LOG_I("try to mount file system!");
                /* try to mount file system on this block device */
                dfs_mount_device(&(blk_dev->dev));
            }
#endif
        }
    }
    else
    {
        LOG_E("read mmcsd first sector failed");
        err = -RT_ERROR;
    }

    /* release sector buffer */
    rt_free(sector);

    return err;

}

rt_int32_t rt_mmcsd_blk_probe(struct rt_mmcsd_card *card)
{
    uint32_t err = 0;

    LOG_D("probe mmcsd block device!");
    if (check_gpt(card) != 0)
    {
        err = gpt_device_probe(card);
    }
    else
    {
        err = mbr_device_probe(card);
    }
    return err;
}

void rt_mmcsd_blk_remove(struct rt_mmcsd_card *card)
{
    rt_list_t *l, *n;
    struct mmcsd_blk_device *blk_dev;

    for (l = (&blk_devices)->next, n = l->next; l != &blk_devices; l = n, n = n->next)
    {
        blk_dev = (struct mmcsd_blk_device *)rt_list_entry(l, struct mmcsd_blk_device, list);
        if (blk_dev->card == card)
        {
            /* unmount file system */
            const char *mounted_path = dfs_filesystem_get_mounted_path(&(blk_dev->dev));
            if (mounted_path)
            {
                dfs_unmount(mounted_path);
                LOG_D("unmount file system %s for device %s.\r\n", mounted_path, blk_dev->dev.parent.name);
            }
            rt_sem_delete(blk_dev->part.lock);
            rt_device_unregister(&blk_dev->dev);
            rt_list_remove(&blk_dev->list);
            rt_free(blk_dev);
        }
    }
}

/*
 * This function will initialize block device on the mmc/sd.
 *
 * @deprecated since 2.1.0, this function does not need to be invoked
 * in the system initialization.
 */
int rt_mmcsd_blk_init(void)
{
    /* nothing */
    return 0;
}