ret = SD_JudgeResult(tmp);					/* 響應(yīng)指示寫(xiě)失敗 response indicate write fail */ 		if (ret != SD_NO_ERR) 			return ret;			     						 	}	ret = SD_ReadCard_Status(sds->RCA, 4, tmp);		if (ret != SD_NO_ERR)		return ret;  	ret = SD_DeSelectCard();						/* CMD7, 退出傳輸狀態(tài) */  	return ret;										/* 返回寫(xiě)入結(jié)果 return the result of writing */									}/********************************************************************************************************************* 函數(shù)名稱(chēng): INT8U SD_GetCardInfo()				Name:	  INT8U SD_GetCardInfo()** 功能描述: 獲得SD卡的信息						Function: get the information of SD card** 輸　  入: sd_struct *sds: SD卡信息結(jié)構(gòu)體 	Input:    sd_struct *sds: the information structure of SD Card** 輸 　 出: 0:   成功   > 0:   錯(cuò)誤碼			Output:	  0:  sucessfully	> 0:  error code*******************************************************************************************************************/INT8U SD_GetCardInfo(sd_struct *sds){	INT32U tmp;	INT8U time_u,time_v,fator;	INT8U recbuf[16],ret;		ret = SD_ReadCSD(sds->RCA, 16, recbuf);	 				    	    /* 讀CSD寄存器    read CSD register */	if (ret != SD_NO_ERR)			return ret;		/* 計(jì)算塊的最大長(zhǎng)度 calculate the size of a sector */	sds->block_len = 1 << (recbuf[READ_BL_LEN_POS] & READ_BL_LEN_MSK);  /* (2 ^ READ_BL_LEN) */		/* 計(jì)算卡中塊的個(gè)數(shù) calculate the sector numbers of the SD Card */	sds->block_num = ((recbuf[C_SIZE_POS1] & C_SIZE_MSK1) << 10) +	      			  (recbuf[C_SIZE_POS2] << 2) +	 	 			 ((recbuf[C_SIZE_POS3] & C_SIZE_MSK3) >> 6) + 1;	/* 計(jì)算(C_SIZE + 1)*/		 	  																tmp = ((recbuf[C_SIZE_MULT_POS1] & C_SIZE_MULT_MSK1) << 1) +   	      ((recbuf[C_SIZE_MULT_POS2] & C_SIZE_MULT_MSK2) >> 7) + 2;		/* 計(jì)算(C_SIZE_MULT + 2) */     																sds->block_num = sds->block_num * (1 << tmp);						/* 獲得卡中塊的數(shù)量: (C_SIZE + 1) * 2 ^ (C_SIZE_MULT + 2) */																		/* get the block numbers in card: (C_SIZE + 1) * 2 ^ (C_SIZE_MULT + 2) */	/* 計(jì)算扇區(qū)大小 calculate the size of sector */	tmp = ((recbuf[SECTOR_SIZE_POS1] & SECTOR_SIZE_MSK1) << 1) +  				      ((recbuf[SECTOR_SIZE_POS2] & SECTOR_SIZE_MSK2) >> 7) + 1;		/* 計(jì)算(SECTOR_SIZE + 1)*/		 			sds->sector_size = tmp;												/* 保存在sds中 save into sds */		    				return SD_NO_ERR;													/* 返回執(zhí)行成功 return perform sucessfully */}/*********************************************************************************************************** Function name: Card_Indentify** Descriptions:  identify card type: SD or MMC card**                判別卡的型號(hào):SD或MMC卡			** Input: 		  sd_struct *sds  : SD/MMC卡信息結(jié)構(gòu)體 	     sd_struct *sds  : the information structure of SD/MMC ** Output: 		  CARDTYPE_SD -- SD card     CARDTYPE_MMC -- MMC card   ** Created by:    MingYuan Zheng 鄭明遠(yuǎn) ** Created Date:  2006-01-09 **-------------------------------------------------------------------------------------------------------** Modified by:** Modified Date: **------------------------------------------------------------------------------------------------------********************************************************************************************************/INT8U Card_Indentify(void){	INT32U param = 0;	INT8U response[6],ret;	ret = SD_SendCommand(CMD55, param, CMD55_R, response);    if (ret == SD_NO_ERR)		return CARDTYPE_SD;	else		return CARDTYPE_MMC;}	/*********************************************************************************************************** Function name: SD_ActiveCard** Descriptions:  active card**                激活卡			** Input: 		  NULL** Output: 		  0:   成功    > 0:  錯(cuò)誤碼					0:  sucessfully	 > 0:  error code ** Created by:    MingYuan Zheng 鄭明遠(yuǎn) ** Created Date:  2006-01-09 **-------------------------------------------------------------------------------------------------------** Modified by:** Modified Date: **------------------------------------------------------------------------------------------------------********************************************************************************************************/INT8U SD_ActiveCard(sd_struct *sds){	INT8U ret,resp[4];	INT32U count = 0; 	do     {	    	if (sds->card_type == CARDTYPE_SD)			/* 讀OCR寄存器      read OCR register */        	ret = SD_ReadOCR(4, resp);        else        	ret = MMC_ReadOCR(4, resp);                if (ret != SD_NO_ERR)       		return ret;        if (count >= SD_IDLE_WAIT_MAX)            return SD_ERR_TIMEOUT_WAITIDLE;			/* 超時(shí),返回錯(cuò)誤碼  timeout,return error code */     	      	count ++;            }while ((resp[3] & MSK_READY) == 0x00);	    if ((resp[2] & MSK_OCR_33) != MSK_OCR_33)        return SD_ERR_VOL_NOTSUSP;					/* 卡不支3.3V電壓   card don't support 3.3V voltage */					return SD_NO_ERR;}/*********************************************************************************************************** Function name: sdmmc_interrupt** Descriptions:  SD/MMC card interrupt handler **                SD/MMC 卡中斷處理程序			** Input: 		  input parameter of linux interrupt handler** Output: 		  NULL ** Created by:    MingYuan Zheng 鄭明遠(yuǎn) ** Created Date:  2006-01-09 **-------------------------------------------------------------------------------------------------------** Modified by:** Modified Date: **------------------------------------------------------------------------------------------------------********************************************************************************************************/#if SD_INTERRUPT_ENvoid sdmmc_interrupt(int irq, void *dev_id, struct pt_regs *regs){	INT32U stat;	INT32U cnt;	INT32U tmp;	if (reading == 1)	{		stat = SDIFSTA;                            		  	  /* 讀FIFO狀態(tài)寄存器 */				/* FIFO 中的數(shù)據(jù)不足64個(gè)字節(jié) */		if (stat & SDIFSTA_RX_LAST)		{ 									                  /* 最后數(shù)據(jù)就緒 */                    			cnt = (stat & SDIFSTA_CNT) / sizeof(INT32U);      /* 取得FIFO中的“字”數(shù) */			while (cnt) 			{				tmp = SDIDAT;								  /* 從FIFO中讀出數(shù)據(jù) */				buffer[bufcnt] = (INT8U)(tmp); 				buffer[bufcnt + 1] = (INT8U)(tmp >> 8); 				buffer[bufcnt + 2] = (INT8U)(tmp >> 16); 				buffer[bufcnt + 3] = (INT8U)(tmp >> 24); 				bufcnt += sizeof(INT32U);				cnt--;			}					/* Rx FIFO為滿,那么讀64個(gè)字節(jié) */			}		else if (stat & SDIFSTA_RX_FULL)		{			cnt = SDI_MAX_RX_FIFO / sizeof(INT32U);			while (cnt && bufcnt < datalen) 			{				tmp = SDIDAT;								  /* 從FIFO中讀出數(shù)據(jù) */				buffer[bufcnt] = (INT8U)(tmp); 				buffer[bufcnt + 1] = (INT8U)(tmp >> 8); 				buffer[bufcnt + 2] = (INT8U)(tmp >> 16); 				buffer[bufcnt + 3] = (INT8U)(tmp >> 24); 				bufcnt += sizeof(INT32U);				cnt--;			}		}				stat = SDIDSTA;		if (stat & SDIDSTA_DFIN)		{             									 	   /* 數(shù)據(jù)傳輸完成 */			SDIDSTA = stat;			error = SD_NO_ERR;			wake_up_interruptible(&wq);		} 		else if (stat & SDIDSTA_TOUT) 		{       											   /* 數(shù)據(jù)/忙接收超時(shí) */    			SDIDSTA = stat;			error = SD_ERR_TIMEOUT_READ;			wake_up_interruptible(&wq);		}			}		/* 下面為寫(xiě)狀態(tài) */	else	{		stat = SDIFSTA;		if (stat & SDIFSTA_TX_EMP)		{               							    		/* TX FIFO 為空  */			cnt = SDI_MAX_TX_FIFO / sizeof(INT32U);			while (cnt && bufcnt < datalen) 			{ 	 												/* 往FIFO里寫(xiě)入數(shù)據(jù) */				SDIDAT = (buffer[bufcnt + 3] << 24) + (buffer[bufcnt + 2] << 16) +  						 (buffer[bufcnt + 1] << 8) + buffer[bufcnt];  				bufcnt += sizeof(INT32U);				cnt--;			}		}		stat = SDIDSTA;		if (stat & SDIDSTA_DFIN) 		{											     		/* 數(shù)據(jù)傳輸完成,使能等待任務(wù) */			SDIDSTA = stat;			error = SD_NO_ERR;			wake_up_interruptible(&wq);		} 		else if (stat & SDIDSTA_TOUT) 		{ 											     		/* 數(shù)據(jù)傳輸超時(shí) */			SDIDSTA = stat;			error = SD_ERR_TIMEOUT_WRITE;			wake_up_interruptible(&wq);		}		}		/* clear the interrupt of mcu */ 	SRCPND = 1 << 21;											/* 清除相關(guān)中斷標(biāo)志 */			INTPND = 1 << 21; 	}#endif/*********************************************************************************************************** Function name: card_detect_interrupt** Descriptions:  the interrupt handler of card insert detect**                卡插入檢測(cè)中斷處理函數(shù)			** Input: 		  input parameter of linux interrupt handler** Output: 		  NULL ** Created by:    MingYuan Zheng 鄭明遠(yuǎn) ** Created Date:  2006-01-09 **-------------------------------------------------------------------------------------------------------** Modified by:** Modified Date: **------------------------------------------------------------------------------------------------------********************************************************************************************************/void card_detect_interrupt(int irq, void *dev_id, struct pt_regs *regs){	int bempty;#ifdef SD_CD_LEVEL_LOW                          	/* 如果是低電平表示插入 */	bempty = read_gpio_bit(SD_GPIO_CD);#else	bempty = !read_gpio_bit(SD_GPIO_CD);#endif	if ((!card_insert) && (!bempty)) 	{		/* card inserted 卡插入 */		card_insert = 1;		card_change = 1;		printk("SD/MMC card insert!\n");	} 	else if (card_insert && bempty)	{	/* card ejected 卡拔出 */		card_insert = 0;		card_change = 1;#if SD_INTERRUPT_EN		error = SD_ERR_NO_CARD;						/* no card error code */		wake_up_interruptible(&wq);#endif		printk("SD/MMC card ejected!\n");	}	}/***********************************************************************************************************                            End Of File**********************************************************************************************************/