rt-thread/bsp/mini4020/drivers/sdcard.c

/*
 * File      : sdcard.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2007 - 2012, RT-Thread Development Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rt-thread.org/license/LICENSE
 *
 * Change Logs:
 * Date           Author      Notes
 * 2007-12-02     Yi.Qiu      the first version
 * 2010-01-01     Bernard     Modify for mini2440
 * 2010-10-13     Wangmeng    Added sep4020 support
 */

#include "sdcard.h"
//#include <dfs_config.h>

volatile rt_int32_t RCA;

#ifdef RT_USING_DFS

/* RT-Thread Device Driver Interface */
#include <rtthread.h>						  
#include <dfs_fs.h>

/*GLOBAL SD DEVICE PONITER*/
static struct sd_device *ptr_sddev;
static rt_uint8_t gsec_buf[SECTOR_SIZE];

#define USE_TIMEOUT

/*This file is to power on/off the SEP4020 SDC*/
/**
 * This function will power on/off the SEP4020 SDC
 *
 * @param sd_ctl: 0/power on; 1/power off
 * @return none
 *
 */
static void sd_pwr(int sd_ctl)
{
	if (sd_ctl)
	{
	    *(RP)GPIO_PORTA_SEL  |= 0x0200;
	    *(RP)GPIO_PORTA_DIR  &= (~0x0200);
	    *(RP)GPIO_PORTA_DATA |= 0x0200;
	}
	else
	{
	     
	   *(RP)GPIO_PORTA_SEL |= 0x0200;
	   *(RP)GPIO_PORTA_DIR &= (~0x0200);
	   *(RP)GPIO_PORTA_DATA &= (~0x0200);     
	}
}

/*a nop operation to delay*/
static void delay (U32 j)
{ 
  U32 i;
  
  for (i=0;i<j;i++)
  {};

}
/*
* Send the command to set the data transfer mode
* @param cmd:the command to sent
* @param arg:the argument of the command
* @param mode:SDC transfer mode
* @param blk_len:the block size of each data
* @param num:number of blocks
* @param mask:sdc interrupt mask
*/
static rt_err_t cmd_data(U16 cmd,U32 arg,U16 mode,U16 blk_len,U16 num,U16 mask)
{
    U32 i;
	#ifdef USE_TIMEOUT
	U32 to = 10000;
	#endif
    
    *(RP)SDC_CLOCK_CONTROL = 0Xff00;                  //配置SD时钟，512分频,关闭SD 时钟
    *(RP)SDC_CLOCK_CONTROL = 0Xff04;                  //打开SD时钟，512分频,开启SD 时钟
    *(RP)SDC_INTERRUPT_STATUS_MASK = mask;         //中断状态屏蔽寄存器赋值
    
    *(RP)SDC_TRANSFER_MODE = mode;               //传输模式选择寄存器赋值
    
    *(RP)SDC_BLOCK_SIZE = blk_len;                     //数据块长度寄存器赋值
    *(RP)SDC_BLOCK_COUNT = num;                       //数据块数目寄存器赋值
    *(RP)SDC_ARGUMENT = arg;                          //命令参数寄存器赋值
    *(RP)SDC_COMMAND = cmd;                           //命令控制寄存器赋值
    
    delay(10);                                  
   
    i = *(RP)SDC_INTERRUPT_STATUS & 0x1000;
	
    while(i != 0x1000)                             //判断：是否命令发送完毕，并且收到响应
    {
	   i = *(RP)SDC_INTERRUPT_STATUS & 0x1000;
	   #ifdef USE_TIMEOUT
	   to --;
	   if(!to)
	   {
	   		EOUT("%s TIMEOUT\n",__FUNCTION__);
			return RT_ETIMEOUT;
	   }
	   #endif
    }
    delay(160);

	#ifdef USE_TIMEOUT
	//DBOUT("cmd_data TO is %d\n",to);
	#endif

    return *(RP)SDC_RESPONSE0;                     //返回命令反馈信息
}

static rt_err_t cmd_response(U16 Cmd,U32 Arg,U16 TransMode,U16 BlkLen,U16 Nob,U16 IntMask)
{
   U32 i;
   #ifdef USE_TIMEOUT
   U32 to = 50000;
   #endif
    
   *(RP)SDC_CLOCK_CONTROL=0Xff00;               //配置SD时钟
   
   *(RP)SDC_CLOCK_CONTROL=0Xff04;               //打开SD时钟		
    
    
    *(RP)SDC_INTERRUPT_STATUS_MASK=IntMask;     //中断状态屏蔽寄存器赋值
    *(RP)SDC_TRANSFER_MODE=TransMode;           //传输模式选择寄存器赋值
    *(RP)SDC_BLOCK_SIZE=BlkLen;                 //数据块长度寄存器赋值
    *(RP)SDC_BLOCK_COUNT=Nob;                   //数据块数目寄存器赋值
    *(RP)SDC_ARGUMENT=Arg;                      //命令参数寄存器赋值
    *(RP)SDC_COMMAND=Cmd;                       //命令控制寄存器赋值
    
    delay(10);    
        
    i = *(RP)SDC_INTERRUPT_STATUS & 0x1040;
	
    while(i != 0x1040)                         //判断：命令发送完毕，并且收到响应，数据传输完毕。这三项是否已经都完成。
    {
		i = *(RP)SDC_INTERRUPT_STATUS & 0x1040;
		#ifdef USE_TIMEOUT
		to--;
		if(!to)
		{
			EOUT("%s Timeout\n",__FUNCTION__);
			return RT_ETIMEOUT;
		}
		#endif
    }
    
	//DBOUT("cmd_response TO is %d\n",to);
    delay(100);
    
    return RT_EOK;                  //返回命令反馈信息
}
static rt_err_t cmd_wait(U16 Cmd,U32 Arg,U16 IntMask )
{
    int i;
	#ifdef USE_TIMEOUT
	U32 to=200000;
	#endif

    *(RP)SDC_CLOCK_CONTROL=0Xff00;                       //配置SD时钟
    
    *(RP)SDC_CLOCK_CONTROL=0Xff04;                       //打开SD时钟
       
    *(RP)SDC_COMMAND=Cmd;                                //命令控制寄存器赋值    
                    
    *(RP)SDC_INTERRUPT_STATUS_MASK=IntMask;              //中断状态屏蔽寄存器赋值
    
    *(RP)SDC_ARGUMENT=Arg;                               //命令参数寄存器赋值
	
    i = *(RP)SDC_INTERRUPT_STATUS & 0x1000;
	
    while(i != 0x1000)                                  //判断：是否命令发送完毕，并且收到响应
    {
		i = *(RP)SDC_INTERRUPT_STATUS & 0x1000;
		#ifdef USE_TIMEOUT
		to--;
		if(!to)
		{
			EOUT("%s Timeout\n",__FUNCTION__);
			return RT_ETIMEOUT;
		}
		#endif

    }

	//DBOUT("cmd_wait TO is %d\n",to);    

    delay(10);
        	                	             
    return RT_EOK;                           //返回命令反馈信息以及数值1
}
/**
 * This function will set a hook function, which will be invoked when a memory
 * block is allocated from heap memory.
 *
 * @param hook the hook function
 */
static rt_err_t sd_init(void)
{
	rt_err_t err;
	#ifdef USE_TIMEOUT
	rt_uint32_t to=1000;
	#endif
	sd_pwr(1);
    
    *(RP)SDC_SOFTWARE_RESET=0x0;                   //触发软复位,对其写0是进行reset    
    delay(200);
    *(RP)SDC_SOFTWARE_RESET=0x1;                   //不触发软复位    
    delay(200);
 
    cmd_wait(0x08,0x0,0xfff);               //CMD0，命令发送使能
       
	do
    {
    	err = cmd_wait(0x6ea,0x0,0xfff);          //CMD55,以切换到ACMD命令

		#ifdef USE_TIMEOUT
		if(err != RT_EOK)
		{	
			EOUT("cmd_wait err in %s\n",__FUNCTION__);
			return RT_ETIMEOUT;
		}
		#endif
    	
    	delay(3);  
    	err = cmd_wait(0x52a,0x80ff8000,0xfff);   //ACMD41，向SD控制器发送命令，等待SD控制器确认收到命令
		if(err != RT_EOK)
		{	
			EOUT("cmd_wait err in %s\n",__FUNCTION__);
			return RT_ETIMEOUT;
		}
		#ifdef USE_TIMEOUT
		to--;
		if(!to)
		{
			EOUT("%s timeout\n",__FUNCTION__);
			return RT_ETIMEOUT;
		}
		#endif
       
    }while(*(RP)SDC_RESPONSE0<0X80008000);

	#ifdef USE_TIMEOUT
    //DBOUT("%s TO is %d\n",__FUNCTION__,to);
	#endif

    cmd_data(0x49,0X0,0X0,0x0,0x0,0Xfff);//CMD2，发送CID    
    cmd_data(0x6a,0X0,0X0,0x0,0x0,0Xfff);//CMD3，询问卡片发出新的相关地址    
    RCA = *(RP)SDC_RESPONSE0;    
    cmd_data(0xea,RCA,0X0,0x0,0x0,0Xfff);//CMD7，设置选择性的相关参数

	return RT_EOK;
}

/**
 * This function will set a hook function, which will be invoked when a memory
 * block is allocated from heap memory.
 *
 * @param hook the hook function
 */
static rt_err_t sd_readblock(rt_uint32_t address, rt_uint8_t* buf)
{
	U32 complete,i;
	rt_uint8_t temp;
	rt_err_t err;
	UNUSED rt_uint32_t discard;
	#ifdef USE_TIMEOUT
	rt_uint32_t to = 10;
	#endif


	//rt_kprintf("in readblock:%x\n",address);
	//Clear all the errors & interrups
	*(RP)DMAC_INTINTERRCLR  |= 0x1;
	*(RP)DMAC_INTINTERRCLR	&= ~0x1;
	*(RP)DMAC_INTTCCLEAR	|= 0x1;
	*(RP)DMAC_INTTCCLEAR	&= ~0x1; 

	/*Clear read fifo*/
	*(RP)(SDC_INTERRUPT_STATUS_MASK) = ~(0x1<<9); //don't mask fifo empty
	while((*(RP)SDC_INTERRUPT_STATUS)&0x200 != 0x200)
		discard = *(RP)SDC_READ_BUFER_ACCESS;

	/*DMAC2,word,size=0x80*/
    *(RP)DMAC_C2SRCADDR  = SDC_READ_BUFER_ACCESS;           
    *(RP)DMAC_C2DESTADDR = (rt_uint32_t)buf;                
    *(RP)DMAC_C2CONTROL  =0x20249b;                        
    *(RP)DMAC_C2CONFIGURATION = 0x38d;                      	

    err = cmd_wait(0x6ea,RCA,0xfff);                       
	if(err != RT_EOK)
	{
		rt_set_errno(err);
		return err;
	}

    err = cmd_wait(0xca,0x2,0xfff);
	if(err != RT_EOK)
	{
		rt_set_errno(err);
		return err;
	}                       
   						
    err = cmd_response(0x22e,address,0X1,0x0200,0x1,0Xfff); //CMD17 4bit mode
	if(err != RT_EOK)
	{
		rt_set_errno(err);
		return err;
	}
    
    complete = *(RP)SDC_INTERRUPT_STATUS;
    
	/*CRC*/
    if((complete |0xfffffffd) !=0xfffffffd)              
    {
     	rt_kprintf("CRC ERROR!!!\n");
      	complete = *(RP)SDC_INTERRUPT_STATUS;
    }
	while(((*(RP)( DMAC_INTTCSTATUS)) & 0x4) != 0x4 )
	{
		delay(10);
		#ifdef USE_TIMEOUT
		to--;
		if(!to)
		{
			EOUT("%s TIMEOUT\n",__FUNCTION__);
			return RT_ETIMEOUT;
		}
		#endif
	}
	#ifdef USE_TIMEOUT
	//DBOUT("%s timeout is %d\n",__FUNCTION__,to);
	#endif
	/*for the buf is big-endian we must reverse it*/
	for(i = 0;i<0x80;i++)
	{
		temp = buf[0];
		buf[0] = buf[3];
		buf[3] = temp;

		temp = buf[1];
		buf[1] = buf[2];
		buf[2] = temp;

		buf += 4;
	}  

	return RT_EOK;
}

static rt_uint8_t sd_readmultiblock(rt_uint32_t address, rt_uint8_t* buf,rt_uint32_t size)
{
	rt_int32_t index;
	rt_uint8_t status=RT_EOK;
	
	for(index = 0;index < size;index++)
	{
		status = sd_readblock(address+index*SECTOR_SIZE,buf+index*SECTOR_SIZE);
		if(status!=RT_EOK)
			break;	
	}
	return status;
}

/**
 * This function will set a hook function, which will be invoked when a memory
 * block is allocated from heap memory.
 *
 * @param hook the hook function
 */
static rt_uint8_t sd_writeblock(rt_uint32_t address, rt_uint8_t* buf)
{
	U32 complete;
	rt_uint8_t temp;
	rt_uint8_t *ptr = buf;
	rt_err_t err;
	#ifdef USE_TIMEOUT
	rt_uint32_t to = 10;
	#endif

	int i;

	rt_kprintf("in writeblock:%x\n",address);

	/*for the buf is big-endian we must reverse it*/
	for(i = 0;i<0x80;i++)
	{
		temp = ptr[0];
		ptr[0] = ptr[3];
		ptr[3] = temp;

		temp = ptr[1];
		ptr[1] = ptr[2];
		ptr[2] = temp;

		ptr += 4;
	} 
	//Clear all the errors & interrups
	*(RP)DMAC_INTINTERRCLR  |= 0x1;
	*(RP)DMAC_INTINTERRCLR	&= ~0x1;
	*(RP)DMAC_INTTCCLEAR	|= 0x1;
	*(RP)DMAC_INTTCCLEAR	&= ~0x1; 

    //***********************配置DMA2进行四位写*************************
    *(RP)DMAC_C2SRCADDR  = (U32)buf;                  //DMAC道2源地址赋为0x30200000
    *(RP)DMAC_C2DESTADDR = SDC_WRITE_BUFER_ACCESS;           //DMAC道2目的地址赋为发送FIFO的地址
    *(RP)DMAC_C2CONTROL  = 0x20149b;                         //传输尺寸0x080,源地址增加目的地址不增加，传输宽度32bit，传输的数目4                                                  				
    *(RP)DMAC_C2CONFIGURATION = 0x380b;	                     //不屏蔽传输中断，屏蔽错误中断，通道使能，传输类型：存储器到外设							       				 	    
    
    
    err = cmd_wait(0x6ea,RCA,0xfff);                        //CMD55，以切换到ACMD命令
	if(err != RT_EOK)
	{
		rt_set_errno(err);
		return err;
	}

    err = cmd_wait(0xca,0x2,0xfff);                         //ACMD6，定义数据线宽度，48 位短反馈，无数据传输
    if(err != RT_EOK)
	{
		rt_set_errno(err);
		return err;
	}
  
    err = cmd_response(0x30e,address,0X3,0x0200,0x1,0Xfff);  //CMD24  1bit mode
    if(err != RT_EOK)
	{
		rt_set_errno(err);
		return err;
	}
 
    complete = *(RP)SDC_INTERRUPT_STATUS;
    
    if((complete |0xfffffffe) !=0xfffffffe)               //响应超时错误
    {
      //printf("CRC ERROR");
      complete = *(RP)SDC_INTERRUPT_STATUS;
    } 
	
	while(((*(RP)( DMAC_INTTCSTATUS)) & 0x4) != 0x4 )
	{
		delay(10);
		#ifdef USE_TIMEOUT
		to--;
		if(!to)
		{
			EOUT("%s TIMEOUT\n",__FUNCTION__);
		}
		#endif
	}
	#ifdef USE_TIMEOUT
	//DBOUT("%s timeout is %d\n",__FUNCTION__,to);
	#endif

	return RT_EOK;
}


/**
 * This function will set a hook function, which will be invoked when a memory
 * block is allocated from heap memory.
 *
 * @param hook the hook function
 */
static rt_err_t rt_sdcard_init(rt_device_t dev)
{
	return 0;
}

/**
 * This function will set a hook function, which will be invoked when a memory
 * block is allocated from heap memory.
 *
 * @param hook the hook function
 */
static rt_err_t rt_sdcard_open(rt_device_t dev, rt_uint16_t oflag)
{
	return 0;
}

/**
 * This function will set a hook function, which will be invoked when a memory
 * block is allocated from heap memory.
 *
 * @param hook the hook function
 */
static rt_err_t rt_sdcard_close(rt_device_t dev)
{
	return 0;
}

/**
 * This function will set a hook function, which will be invoked when a memory
 * block is allocated from heap memory.
 *
 * @param hook the hook function
 */
static rt_err_t rt_sdcard_control(rt_device_t dev, rt_uint8_t cmd, void *args)
{
	rt_kprintf("cmd = %d\n",cmd);
	    RT_ASSERT(dev != RT_NULL);

    if (cmd == RT_DEVICE_CTRL_BLK_GETGEOME)
    {
        struct rt_device_blk_geometry *geometry;

        geometry = (struct rt_device_blk_geometry *)args;
        if (geometry == RT_NULL) return -RT_ERROR;

        geometry->bytes_per_sector = 512;
        geometry->block_size = 0x200000;
		//if (CardType == SDIO_HIGH_CAPACITY_SD_CARD)
		//	geometry->sector_count = (SDCardInfo.SD_csd.DeviceSize + 1)  * 1024;
		//else
        	geometry->sector_count = 0x200000;//SDCardInfo.CardCapacity/SDCardInfo.CardBlockSize;
    }

    return RT_EOK;
}

/**
 * This function will set a hook function, which will be invoked when a memory
 * block is allocated from heap memory.
 *
 * @param hook the hook function
 */
static rt_size_t rt_sdcard_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
{
	rt_uint32_t retry = 3;
	rt_uint8_t	status;
	rt_uint32_t index;

	///*take the semaphore
	struct dfs_partition *part = (struct dfs_partition *)dev->user_data;
	rt_sem_take(part->lock, RT_WAITING_FOREVER);
    while(retry--)
    {
		if (((rt_uint32_t)buffer % 4 != 0) ||
        ((rt_uint32_t)buffer > 0x20080000))
		{
			for(index = 0;index < size;index++)
			{
				status = sd_readblock((part->offset + pos) * SECTOR_SIZE,ptr_sddev->sec_buf);
				if(status != RT_EOK)
					break;
	
				rt_memcpy((rt_uint8_t *)buffer + (index * SECTOR_SIZE),ptr_sddev->sec_buf,SECTOR_SIZE);
			}
		}
		else
		{
			 for(index = 0;index<size;index++)
			 {
			 	status = sd_readblock((pos) * SECTOR_SIZE,(rt_uint8_t*)buffer + index * SECTOR_SIZE);
				if(status != RT_EOK)
					break;
			 }
		}

    } 
	rt_sem_release(part->lock);

	if (status == RT_EOK) 
		return size;

	rt_kprintf("read failed: %d, buffer 0x%08x\n", status, buffer);
	return 0;  

}

/**
 * This function will set a hook function, which will be invoked when a memory
 * block is allocated from heap memory.
 *
 * @param hook the hook function
 */
static rt_size_t rt_sdcard_write (rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)
{
	int i;
	rt_uint8_t status;

	struct dfs_partition *part = (struct dfs_partition *)dev->user_data;

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

	rt_sem_take(part->lock, RT_WAITING_FOREVER);

    if (((rt_uint32_t)buffer % 4 != 0) ||
        ((rt_uint32_t)buffer > 0x20080000))
	{
		rt_uint32_t index;

		for(index=0;index<size;index++)
		{
			 rt_memcpy(ptr_sddev->sec_buf, ((rt_uint8_t*)buffer + index * SECTOR_SIZE), SECTOR_SIZE);
			 status = sd_writeblock((part->offset + index + pos)*SECTOR_SIZE,ptr_sddev->sec_buf);
		}
	}
	else
	{  

		for(i=0;i<size;i++)
		{
			status = sd_writeblock((part->offset + i + pos)*SECTOR_SIZE,
				(rt_uint8_t*)((rt_uint8_t*)buffer + i * SECTOR_SIZE));	
			if (status != RT_EOK) break;
		}
	}

	rt_sem_release(part->lock);

	if (status == RT_EOK) 
		return size;

	rt_kprintf("read failed: %d, buffer 0x%08x\n", status, buffer);
	return 0;
}


rt_err_t rt_hw_sdcard_exit()
{
	if(ptr_sddev->device != RT_NULL)
		rt_free(ptr_sddev->device);
	if(ptr_sddev->part != RT_NULL)
		rt_free(ptr_sddev->part);
	if(ptr_sddev != RT_NULL)
		rt_free(ptr_sddev);

	return RT_EOK;
}

/**
 * This function will init sd card
 *
 * @param void
 */
rt_err_t rt_hw_sdcard_init()
{
	/*For test*/
	rt_err_t err;
	rt_int32_t i;

	char dname[4];
	char sname[8];

	/*Initialize structure*/

	ptr_sddev = (struct sd_device*)rt_malloc(sizeof(struct sd_device));
	if(ptr_sddev == RT_NULL)
	{
		EOUT("Failed to allocate sdcard device structure\n");
		return RT_ENOMEM;		 	
	}

	/*sdcard intialize*/
	err = sd_init();
	if(err != RT_EOK)
	 	goto FAIL2;

	/*set sector buffer*/
	ptr_sddev->sec_buf = gsec_buf;
	ptr_sddev->buf_size = SECTOR_SIZE;
	ptr_sddev->sdc = (struct sd_c*)SD_BASE;

	//DBOUT("allocate partition sector buffer OK!");

	err = sd_readblock(0,ptr_sddev->sec_buf);
	if(err != RT_EOK)
	{
		EOUT("read first block error\n");
		goto FAIL2;
	}

	/*sdcard driver initialize*/
	ptr_sddev->part = (struct dfs_partition*)rt_malloc(4 * sizeof(struct dfs_partition));
	if(ptr_sddev->part == RT_NULL)
	{
		 EOUT("allocate partition failed\n");
		 err = 	RT_ENOMEM;
		 goto FAIL2;
	}

	/*alloc device buffer*/
	ptr_sddev->device = (struct rt_device*)rt_malloc(4 * sizeof(struct rt_device));
	if(ptr_sddev->device == RT_NULL)
	{
		 EOUT("allocate device failed\n");
		 err = RT_ENOMEM;
		 goto FAIL1;
	}

	ptr_sddev->part_num = 0;

	err = sd_readblock(0,ptr_sddev->sec_buf);

	if(err != RT_EOK)
	{
		EOUT("Read block 0 to initialize ERROR\n");
		goto FAIL1;
	}

	for(i=0; i<4; i++)
	{
		/* get the first partition */
		err = dfs_filesystem_get_partition(&(ptr_sddev->part[i]), ptr_sddev->sec_buf, i);
		if (err == RT_EOK)
		{
			rt_snprintf(dname, 4, "sd%d",  i);
			rt_snprintf(sname, 8, "sem_sd%d",  i);
			ptr_sddev->part[i].lock = rt_sem_create(sname, 1, RT_IPC_FLAG_FIFO);

			/* register sdcard device */
			ptr_sddev->device[i].init = rt_sdcard_init;
			ptr_sddev->device[i].open = rt_sdcard_open;
			ptr_sddev->device[i].close = rt_sdcard_close;
			ptr_sddev->device[i].read = rt_sdcard_read;
			ptr_sddev->device[i].write = rt_sdcard_write;
			ptr_sddev->device[i].control = rt_sdcard_control;
			ptr_sddev->device[i].user_data= &ptr_sddev->part[i];

			err = rt_device_register(&ptr_sddev->device[i], dname,
				RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_REMOVABLE | RT_DEVICE_FLAG_STANDALONE);

			if(err == RT_EOK)
				ptr_sddev->part_num++;
		}
		else
		{
			if(i == 0)
			{
				/* there is no partition table */
				ptr_sddev->part[0].offset = 0;
				ptr_sddev->part[0].size   = 0;
				ptr_sddev->part[0].lock = rt_sem_create("sem_sd0", 1, RT_IPC_FLAG_FIFO);

				/* register sdcard device */
				ptr_sddev->device[0].init = rt_sdcard_init;
				ptr_sddev->device[0].open = rt_sdcard_open;
				ptr_sddev->device[0].close = rt_sdcard_close;
				ptr_sddev->device[0].read = rt_sdcard_read;
				ptr_sddev->device[0].write = rt_sdcard_write;
				ptr_sddev->device[0].control = rt_sdcard_control;
				ptr_sddev->device[0].user_data= &ptr_sddev->part[0];

				err = rt_device_register(&ptr_sddev->device[0], "sd0",
					RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_REMOVABLE | RT_DEVICE_FLAG_STANDALONE);

				if(err == RT_EOK)
					ptr_sddev->part_num++;

				break;
			}
		}
	}

	if(ptr_sddev->part_num == 0)
		goto FAIL0;
	
	return err;

	FAIL0:
	rt_free(ptr_sddev->device);
	ptr_sddev->device = RT_NULL;

	FAIL1:
	rt_free(ptr_sddev->part);
	ptr_sddev->part = RT_NULL;

	FAIL2:
	rt_free(ptr_sddev);
	ptr_sddev = RT_NULL;

	return err;


}

#endif