[SDIO] Create SD block device.

1. New naming rule for multiple cards: sdXpY. Ex: sd0, sd0p0, sd0p1, sd1, sd1p0, sd1p1, .... sdXpY.
2. Always create super-node for backward-compatible and fdisk-like utility. EX: sd0, sd1, ..... sdX.
3. Shrink code.

components/drivers/sdio/block_dev.c

@@ -351,14 +351,83 @@ const static struct rt_device_ops mmcsd_blk_ops =
 };
 #endif
 
+
+static struct mmcsd_blk_device * rt_mmcsd_create_blkdev(struct rt_mmcsd_card *card, const char* dname, struct dfs_partition* psPart, rt_bool_t bMount)
+{
+    struct mmcsd_blk_device *blk_dev;
+    char sname[12];
+
+    blk_dev = rt_calloc(1, sizeof(struct mmcsd_blk_device));
+    if (!blk_dev)
+    {
+        LOG_E("mmcsd:malloc memory failed!");
+        return RT_NULL;
+    }
+
+    if (psPart != RT_NULL)
+    {
+        rt_memcpy(&blk_dev->part, psPart, sizeof(struct dfs_partition));
+        blk_dev->geometry.sector_count = psPart->size;
+    }
+    else
+    {
+        blk_dev->part.offset = 0;
+        blk_dev->part.size   = 0;
+        blk_dev->geometry.sector_count = card->card_capacity * (1024 / 512);
+    }
+
+    blk_dev->geometry.bytes_per_sector = 1<<9;
+    blk_dev->geometry.block_size = card->card_blksize;
+
+    blk_dev->part.lock = rt_sem_create(sname, 1, RT_IPC_FLAG_FIFO);
+
+    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);
+
+    rt_snprintf(sname, sizeof(sname), "sem_%s", dname);
+
+    /* 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->dev.user_data = blk_dev;
+
+    blk_dev->card = card;
+
+
+    rt_device_register(&blk_dev->dev, dname,
+        RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_REMOVABLE | RT_DEVICE_FLAG_STANDALONE);
+
+    /* Insert to list. */
+    rt_list_insert_after(&card->blk_devices, &blk_dev->list);
+
+#ifdef RT_USING_DFS_MNTTABLE
+    if ( bMount && 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
+
+    return blk_dev;
+}
+
 rt_int32_t rt_mmcsd_blk_probe(struct rt_mmcsd_card *card)
 {
     rt_int32_t err = 0;
-    rt_uint8_t i, status;
+    rt_uint8_t status;
     rt_uint8_t *sector;
-    char dname[8];
-    char sname[12];
-    struct mmcsd_blk_device *blk_dev = RT_NULL;
 
     err = mmcsd_set_blksize(card);
     if(err)
@@ -380,108 +449,43 @@ rt_int32_t rt_mmcsd_blk_probe(struct rt_mmcsd_card *card)
     status = rt_mmcsd_req_blk(card, 0, sector, 1, 0);
     if (status == RT_EOK)
     {
+        rt_uint8_t i; 
+        char dname[8];
+        struct dfs_partition part;
+        struct mmcsd_blk_device *blk_dev = RT_NULL;
         rt_int32_t host_id = card->host->id;
 
         /* Initial blk_device link-list. */
         rt_list_init(&card->blk_devices);
+
         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;
-            }
-
-            /* Given block device name is with allocated host id and its partition index. */
-            rt_snprintf(dname, sizeof(dname), "sd%c%d", (host_id+'a'), i);
-            rt_snprintf(sname, sizeof(sname), "sem_sd%c%d", (host_id+'a'), i);
-
-            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);
+            /* Get the first partition */
+            status = dfs_filesystem_get_partition(&part, sector, i);
             if (status == RT_EOK)
             {
-                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->dev.user_data = blk_dev;
-
-                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;
-
-                rt_device_register(&blk_dev->dev, dname,
-                    RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_REMOVABLE | RT_DEVICE_FLAG_STANDALONE);
-                rt_list_insert_after(&card->blk_devices, &blk_dev->list);
-            }
-            else
-            {
-                if (i == 0)
+                /* Given name is with allocated host id and its partition index. */
+                rt_snprintf(dname, sizeof(dname), "sd%dp%d", host_id, i);
+                blk_dev = rt_mmcsd_create_blkdev(card, (const char*)dname, &part, RT_TRUE);
+                if ( blk_dev == RT_NULL )
                 {
-                    /* there is no partition table */
-                    blk_dev->part.offset = 0;
-                    blk_dev->part.size   = 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->dev.user_data = blk_dev;
-
-                    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);
-
-                    rt_device_register(&blk_dev->dev, dname,
-                        RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_REMOVABLE | RT_DEVICE_FLAG_STANDALONE);
-                    rt_list_insert_after(&card->blk_devices, &blk_dev->list);
-                }
-                else
-                {
-                    rt_free(blk_dev);
-                    blk_dev = RT_NULL;
-                    break;
+                    err = -RT_ENOMEM;
+                    goto exit_rt_mmcsd_blk_probe;
                 }
             }
-
-#ifdef RT_USING_DFS_MNTTABLE
-            if (blk_dev)
+            else
             {
-                LOG_I("try to mount file system!");
-                /* try to mount file system on this block device */
-                dfs_mount_device(&(blk_dev->dev));
+                break;
             }
-#endif
+        } // for
+
+        /* Always create the super node, given name is with allocated host id. */
+        rt_snprintf(dname, sizeof(dname), "sd%d", host_id);
+        blk_dev = rt_mmcsd_create_blkdev(card, (const char*)dname, RT_NULL, RT_TRUE /*(i==0)?RT_TRUE:RT_FALSE*/);
+        if ( blk_dev == RT_NULL )
+        {
+            err = -RT_ENOMEM;
+            goto exit_rt_mmcsd_blk_probe;
         }
     }
     else
@@ -490,6 +494,8 @@ rt_int32_t rt_mmcsd_blk_probe(struct rt_mmcsd_card *card)
         err = -RT_ERROR;
     }
 
+exit_rt_mmcsd_blk_probe:
+
     /* release sector buffer */
     rt_free(sector);