 4fda063232
			
		
	
	
		4fda063232
		
	
	
	
	
		
			
			Copyright (c) 2006 Uwe Stuehler <uwe@openbsd.org> Change-Id: Ia183d522a6ef1528b045a6fc6cd2e8930c669c32
		
			
				
	
	
		
			356 lines
		
	
	
		
			14 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
			
		
		
	
	
			356 lines
		
	
	
		
			14 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
| /*	$NetBSD: sdmmcreg.h,v 1.8 2012/01/27 03:07:21 matt Exp $	*/
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| /*	$OpenBSD: sdmmcreg.h,v 1.4 2009/01/09 10:55:22 jsg Exp $	*/
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| 
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| /*
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|  * Copyright (c) 2006 Uwe Stuehler <uwe@openbsd.org>
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|  *
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|  * Permission to use, copy, modify, and distribute this software for any
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|  * purpose with or without fee is hereby granted, provided that the above
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|  * copyright notice and this permission notice appear in all copies.
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|  *
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|  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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|  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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|  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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|  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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|  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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|  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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|  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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|  */
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| 
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| #ifndef	_SDMMCREG_H_
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| #define	_SDMMCREG_H_
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| 
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| /* MMC commands */				/* response type */
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| #define MMC_GO_IDLE_STATE		0	/* R0 */
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| #define MMC_SEND_OP_COND		1	/* R3 */
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| #define MMC_ALL_SEND_CID		2	/* R2 */
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| #define MMC_SET_RELATIVE_ADDR 	  	3	/* R1 */
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| #define MMC_SWITCH			6	/* R1b */
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| #define MMC_SELECT_CARD			7	/* R1 */
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| #define MMC_SEND_EXT_CSD		8	/* R1 */
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| #define MMC_SEND_CSD			9	/* R2 */
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| #define MMC_SEND_CID			10	/* R2 */
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| #define MMC_STOP_TRANSMISSION		12	/* R1b */
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| #define MMC_SEND_STATUS			13	/* R1 */
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| #define MMC_INACTIVE_STATE		15	/* R0 */
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| #define MMC_SET_BLOCKLEN		16	/* R1 */
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| #define MMC_READ_BLOCK_SINGLE		17	/* R1 */
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| #define MMC_READ_BLOCK_MULTIPLE		18	/* R1 */
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| #define MMC_SET_BLOCK_COUNT		23	/* R1 */
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| #define MMC_WRITE_BLOCK_SINGLE		24	/* R1 */
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| #define MMC_WRITE_BLOCK_MULTIPLE	25	/* R1 */
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| #define MMC_PROGRAM_CSD			27	/* R1 */
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| #define MMC_SET_WRITE_PROT		28	/* R1b */
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| #define MMC_SET_CLR_WRITE_PROT		29	/* R1b */
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| #define MMC_SET_SEND_WRITE_PROT		30	/* R1 */
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| #define MMC_TAG_SECTOR_START		32	/* R1 */
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| #define MMC_TAG_SECTOR_END		33	/* R1 */
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| #define MMC_UNTAG_SECTOR		34	/* R1 */
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| #define MMC_TAG_ERASE_GROUP_START	35	/* R1 */
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| #define MMC_TAG_ERASE_GROUP_END		36	/* R1 */
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| #define MMC_UNTAG_ERASE_GROUP		37	/* R1 */
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| #define MMC_ERASE			38	/* R1b */
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| #define MMC_LOCK_UNLOCK			42	/* R1b */
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| #define MMC_APP_CMD			55	/* R1 */
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| #define MMC_READ_OCR			58	/* R3 */
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| 
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| /* SD commands */			/* response type */
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| #define SD_SEND_RELATIVE_ADDR 	  	3	/* R6 */
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| #define SD_SEND_SWITCH_FUNC		6	/* R1 */
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| #define SD_SEND_IF_COND			8	/* R7 */
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| 
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| /* SD application commands */			/* response type */
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| #define SD_APP_SET_BUS_WIDTH		6	/* R1 */
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| #define SD_APP_OP_COND			41	/* R3 */
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| #define SD_APP_SEND_SCR			51	/* R1 */
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| 
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| /* OCR bits */
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| #define MMC_OCR_MEM_READY		(1U<<31)/* memory power-up status bit */
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| #define MMC_OCR_HCS			(1<<30)
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| #define MMC_OCR_3_5V_3_6V		(1<<23)
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| #define MMC_OCR_3_4V_3_5V		(1<<22)
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| #define MMC_OCR_3_3V_3_4V		(1<<21)
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| #define MMC_OCR_3_2V_3_3V		(1<<20)
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| #define MMC_OCR_3_1V_3_2V		(1<<19)
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| #define MMC_OCR_3_0V_3_1V		(1<<18)
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| #define MMC_OCR_2_9V_3_0V		(1<<17)
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| #define MMC_OCR_2_8V_2_9V		(1<<16)
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| #define MMC_OCR_2_7V_2_8V		(1<<15)
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| #define MMC_OCR_2_6V_2_7V		(1<<14)
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| #define MMC_OCR_2_5V_2_6V		(1<<13)
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| #define MMC_OCR_2_4V_2_5V		(1<<12)
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| #define MMC_OCR_2_3V_2_4V		(1<<11)
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| #define MMC_OCR_2_2V_2_3V		(1<<10)
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| #define MMC_OCR_2_1V_2_2V		(1<<9)
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| #define MMC_OCR_2_0V_2_1V		(1<<8)
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| #define MMC_OCR_1_9V_2_0V		(1<<7)
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| #define MMC_OCR_1_8V_1_9V		(1<<6)
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| #define MMC_OCR_1_7V_1_8V		(1<<5)
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| #define MMC_OCR_1_6V_1_7V		(1<<4)
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| 
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| /* R1 response type bits */
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| #define MMC_R1_READY_FOR_DATA		(1<<8)	/* ready for next transfer */
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| #define MMC_R1_APP_CMD			(1<<5)	/* app. commands supported */
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| 
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| /* 48-bit response decoding (32 bits w/o CRC) */
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| #define MMC_R1(resp)			((resp)[0])
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| #define MMC_R3(resp)			((resp)[0])
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| #define SD_R6(resp)			((resp)[0])
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| #define MMC_R7(resp)			((resp)[0])
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| #define MMC_SPI_R1(resp)		((resp)[0])
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| #define MMC_SPI_R7(resp)		((resp)[1])
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| 
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| /* RCA argument and response */
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| #define MMC_ARG_RCA(rca)		((rca) << 16)
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| #define SD_R6_RCA(resp)			(SD_R6((resp)) >> 16)
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| 
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| /* bus width argument */
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| #define SD_ARG_BUS_WIDTH_1		0
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| #define SD_ARG_BUS_WIDTH_4		2
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| 
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| /* EXT_CSD fields */
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| #define EXT_CSD_BUS_WIDTH		183	/* WO */
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| #define EXT_CSD_HS_TIMING		185	/* R/W */
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| #define EXT_CSD_REV			192	/* RO */
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| #define EXT_CSD_STRUCTURE		194	/* RO */
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| #define EXT_CSD_CARD_TYPE		196	/* RO */
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| 
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| /* EXT_CSD field definitions */
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| #define EXT_CSD_CMD_SET_NORMAL		(1U << 0)
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| #define EXT_CSD_CMD_SET_SECURE		(1U << 1)
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| #define EXT_CSD_CMD_SET_CPSECURE	(1U << 2)
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| 
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| /* EXT_CSD_BUS_WIDTH */
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| #define EXT_CSD_BUS_WIDTH_1		0	/* 1 bit mode */
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| #define EXT_CSD_BUS_WIDTH_4		1	/* 4 bit mode */
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| #define EXT_CSD_BUS_WIDTH_8		2	/* 8 bit mode */
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| 
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| /* EXT_CSD_STRUCTURE */
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| #define EXT_CSD_STRUCTURE_VER_1_0	0	/* CSD Version No.1.0 */
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| #define EXT_CSD_STRUCTURE_VER_1_1	1	/* CSD Version No.1.1 */
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| #define EXT_CSD_STRUCTURE_VER_1_2	2	/* Version 4.1-4.2-4.3 */
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| 
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| /* EXT_CSD_CARD_TYPE */
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| #define EXT_CSD_CARD_TYPE_26M		(1 << 0)
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| #define EXT_CSD_CARD_TYPE_52M		(1 << 1)
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| 
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| /* MMC_SWITCH access mode */
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| #define MMC_SWITCH_MODE_CMD_SET		0x00	/* Change the command set */
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| #define MMC_SWITCH_MODE_SET_BITS	0x01	/* Set bits in value */
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| #define MMC_SWITCH_MODE_CLEAR_BITS	0x02	/* Clear bits in value */
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| #define MMC_SWITCH_MODE_WRITE_BYTE	0x03	/* Set target to value */
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| 
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| /* SPI mode reports R1/R2(SEND_STATUS) status. */
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| #define R1_SPI_IDLE		(1 << 0)
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| #define R1_SPI_ERASE_RESET	(1 << 1)
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| #define R1_SPI_ILLEGAL_COMMAND	(1 << 2)
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| #define R1_SPI_COM_CRC		(1 << 3)
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| #define R1_SPI_ERASE_SEQ	(1 << 4)
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| #define R1_SPI_ADDRESS		(1 << 5)
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| #define R1_SPI_PARAMETER	(1 << 6)
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| /* R1 bit 7 is always zero */
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| #define R2_SPI_CARD_LOCKED	(1 << 8)
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| #define R2_SPI_WP_ERASE_SKIP	(1 << 9)	/* or lock/unlock fail */
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| #define R2_SPI_LOCK_UNLOCK_FAIL	R2_SPI_WP_ERASE_SKIP
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| #define R2_SPI_ERROR		(1 << 10)
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| #define R2_SPI_CC_ERROR		(1 << 11)
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| #define R2_SPI_CARD_ECC_ERROR	(1 << 12)
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| #define R2_SPI_WP_VIOLATION	(1 << 13)
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| #define R2_SPI_ERASE_PARAM	(1 << 14)
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| #define R2_SPI_OUT_OF_RANGE	(1 << 15)	/* or CSD overwrite */
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| #define R2_SPI_CSD_OVERWRITE	R2_SPI_OUT_OF_RANGE
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| 
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| /* MMC R2 response (CSD) */
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| #define MMC_CSD_CSDVER(resp)		MMC_RSP_BITS((resp), 126, 2)
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| #define  MMC_CSD_CSDVER_1_0		0
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| #define  MMC_CSD_CSDVER_1_1		1
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| #define  MMC_CSD_CSDVER_1_2		2 /* MMC 4.1 - 4.2 - 4.3 */
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| #define  MMC_CSD_CSDVER_EXT_CSD		3 /* Version is coded in CSD_STRUCTURE in EXT_CSD */
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| #define MMC_CSD_MMCVER(resp)		MMC_RSP_BITS((resp), 122, 4)
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| #define  MMC_CSD_MMCVER_1_0		0 /* MMC 1.0 - 1.2 */
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| #define  MMC_CSD_MMCVER_1_4		1 /* MMC 1.4 */
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| #define  MMC_CSD_MMCVER_2_0		2 /* MMC 2.0 - 2.2 */
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| #define  MMC_CSD_MMCVER_3_1		3 /* MMC 3.1 - 3.3 */
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| #define  MMC_CSD_MMCVER_4_0		4 /* MMC 4.1 - 4.2 - 4.3 */
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| #define MMC_CSD_TAAC(resp)		MMC_RSP_BITS((resp), 112, 8)
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| #define MMC_CSD_TAAC_MANT(resp)		MMC_RSP_BITS((resp), 115, 4)
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| #define MMC_CSD_TAAC_EXP(resp)		MMC_RSP_BITS((resp), 112, 3)
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| #define MMC_CSD_NSAC(resp)		MMC_RSP_BITS((resp), 104, 8)
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| #define MMC_CSD_TRAN_SPEED(resp)	MMC_RSP_BITS((resp), 96, 8)
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| #define MMC_CSD_TRAN_SPEED_MANT(resp)	MMC_RSP_BITS((resp), 99, 4)
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| #define MMC_CSD_TRAN_SPEED_EXP(resp)	MMC_RSP_BITS((resp), 96, 3)
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| #define MMC_CSD_READ_BL_LEN(resp)	MMC_RSP_BITS((resp), 80, 4)
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| #define MMC_CSD_C_SIZE(resp)		MMC_RSP_BITS((resp), 62, 12)
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| #define MMC_CSD_CAPACITY(resp)		((MMC_CSD_C_SIZE((resp))+1) << \
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| 					 (MMC_CSD_C_SIZE_MULT((resp))+2))
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| #define MMC_CSD_C_SIZE_MULT(resp)	MMC_RSP_BITS((resp), 47, 3)
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| #define MMC_CSD_R2W_FACTOR(resp)	MMC_RSP_BITS((resp), 26, 3)
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| #define MMC_CSD_WRITE_BL_LEN(resp)	MMC_RSP_BITS((resp), 22, 4)
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| 
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| /* MMC v1 R2 response (CID) */
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| #define MMC_CID_MID_V1(resp)		MMC_RSP_BITS((resp), 104, 24)
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| #define MMC_CID_PNM_V1_CPY(resp, pnm)					\
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| 	do {								\
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| 		(pnm)[0] = MMC_RSP_BITS((resp), 96, 8);			\
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| 		(pnm)[1] = MMC_RSP_BITS((resp), 88, 8);			\
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| 		(pnm)[2] = MMC_RSP_BITS((resp), 80, 8);			\
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| 		(pnm)[3] = MMC_RSP_BITS((resp), 72, 8);			\
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| 		(pnm)[4] = MMC_RSP_BITS((resp), 64, 8);			\
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| 		(pnm)[5] = MMC_RSP_BITS((resp), 56, 8);			\
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| 		(pnm)[6] = MMC_RSP_BITS((resp), 48, 8);			\
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| 		(pnm)[7] = '\0';					\
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| 	} while (/*CONSTCOND*/0)
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| #define MMC_CID_REV_V1(resp)		MMC_RSP_BITS((resp), 40, 8)
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| #define MMC_CID_PSN_V1(resp)		MMC_RSP_BITS((resp), 16, 24)
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| #define MMC_CID_MDT_V1(resp)		MMC_RSP_BITS((resp), 8, 8)
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| 
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| /* MMC v2 R2 response (CID) */
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| #define MMC_CID_MID_V2(resp)		MMC_RSP_BITS((resp), 120, 8)
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| #define MMC_CID_OID_V2(resp)		MMC_RSP_BITS((resp), 104, 16)
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| #define MMC_CID_PNM_V2_CPY(resp, pnm)					\
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| 	do {								\
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| 		(pnm)[0] = MMC_RSP_BITS((resp), 96, 8);			\
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| 		(pnm)[1] = MMC_RSP_BITS((resp), 88, 8);			\
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| 		(pnm)[2] = MMC_RSP_BITS((resp), 80, 8);			\
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| 		(pnm)[3] = MMC_RSP_BITS((resp), 72, 8);			\
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| 		(pnm)[4] = MMC_RSP_BITS((resp), 64, 8);			\
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| 		(pnm)[5] = MMC_RSP_BITS((resp), 56, 8);			\
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| 		(pnm)[6] = '\0';					\
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| 	} while (/*CONSTCOND*/0)
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| #define MMC_CID_PSN_V2(resp)		MMC_RSP_BITS((resp), 16, 32)
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| 
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| /* SD R2 response (CSD) */
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| #define SD_CSD_CSDVER(resp)		MMC_RSP_BITS((resp), 126, 2)
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| #define  SD_CSD_CSDVER_1_0		0
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| #define  SD_CSD_CSDVER_2_0		1
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| #define SD_CSD_MMCVER(resp)		MMC_RSP_BITS((resp), 122, 4)
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| #define SD_CSD_TAAC(resp)		MMC_RSP_BITS((resp), 112, 8)
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| #define SD_CSD_TAAC_EXP(resp)		MMC_RSP_BITS((resp), 115, 4)
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| #define SD_CSD_TAAC_MANT(resp)		MMC_RSP_BITS((resp), 112, 3)
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| #define  SD_CSD_TAAC_1_5_MSEC		0x26
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| #define SD_CSD_NSAC(resp)		MMC_RSP_BITS((resp), 104, 8)
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| #define SD_CSD_SPEED(resp)		MMC_RSP_BITS((resp), 96, 8)
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| #define SD_CSD_SPEED_MANT(resp)		MMC_RSP_BITS((resp), 99, 4)
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| #define SD_CSD_SPEED_EXP(resp)		MMC_RSP_BITS((resp), 96, 3)
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| #define  SD_CSD_SPEED_25_MHZ		0x32
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| #define  SD_CSD_SPEED_50_MHZ		0x5a
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| #define SD_CSD_CCC(resp)		MMC_RSP_BITS((resp), 84, 12)
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| #define  SD_CSD_CCC_BASIC		(1 << 0)	/* basic */
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| #define  SD_CSD_CCC_BR			(1 << 2)	/* block read */
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| #define  SD_CSD_CCC_BW			(1 << 4)	/* block write */
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| #define  SD_CSD_CCC_ERACE		(1 << 5)	/* erase */
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| #define  SD_CSD_CCC_WP			(1 << 6)	/* write protection */
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| #define  SD_CSD_CCC_LC			(1 << 7)	/* lock card */
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| #define  SD_CSD_CCC_AS			(1 << 8)	/*application specific*/
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| #define  SD_CSD_CCC_IOM			(1 << 9)	/* I/O mode */
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| #define  SD_CSD_CCC_SWITCH		(1 << 10)	/* switch */
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| #define SD_CSD_READ_BL_LEN(resp)	MMC_RSP_BITS((resp), 80, 4)
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| #define SD_CSD_READ_BL_PARTIAL(resp)	MMC_RSP_BITS((resp), 79, 1)
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| #define SD_CSD_WRITE_BLK_MISALIGN(resp)	MMC_RSP_BITS((resp), 78, 1)
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| #define SD_CSD_READ_BLK_MISALIGN(resp)	MMC_RSP_BITS((resp), 77, 1)
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| #define SD_CSD_DSR_IMP(resp)		MMC_RSP_BITS((resp), 76, 1)
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| #define SD_CSD_C_SIZE(resp)		MMC_RSP_BITS((resp), 62, 12)
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| #define SD_CSD_CAPACITY(resp)		((SD_CSD_C_SIZE((resp))+1) << \
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| 					 (SD_CSD_C_SIZE_MULT((resp))+2))
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| #define SD_CSD_VDD_R_CURR_MIN(resp)	MMC_RSP_BITS((resp), 59, 3)
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| #define SD_CSD_VDD_R_CURR_MAX(resp)	MMC_RSP_BITS((resp), 56, 3)
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| #define SD_CSD_VDD_W_CURR_MIN(resp)	MMC_RSP_BITS((resp), 53, 3)
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| #define SD_CSD_VDD_W_CURR_MAX(resp)	MMC_RSP_BITS((resp), 50, 3)
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| #define  SD_CSD_VDD_RW_CURR_100mA	0x7
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| #define  SD_CSD_VDD_RW_CURR_80mA	0x6
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| #define SD_CSD_V2_C_SIZE(resp)		MMC_RSP_BITS((resp), 48, 22)
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| #define SD_CSD_V2_CAPACITY(resp)	((SD_CSD_V2_C_SIZE((resp))+1) << 10)
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| #define SD_CSD_V2_BL_LEN		0x9 /* 512 */
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| #define SD_CSD_C_SIZE_MULT(resp)	MMC_RSP_BITS((resp), 47, 3)
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| #define SD_CSD_ERASE_BLK_EN(resp)	MMC_RSP_BITS((resp), 46, 1)
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| #define SD_CSD_SECTOR_SIZE(resp)	MMC_RSP_BITS((resp), 39, 7) /* +1 */
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| #define SD_CSD_WP_GRP_SIZE(resp)	MMC_RSP_BITS((resp), 32, 7) /* +1 */
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| #define SD_CSD_WP_GRP_ENABLE(resp)	MMC_RSP_BITS((resp), 31, 1)
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| #define SD_CSD_R2W_FACTOR(resp)		MMC_RSP_BITS((resp), 26, 3)
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| #define SD_CSD_WRITE_BL_LEN(resp)	MMC_RSP_BITS((resp), 22, 4)
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| #define  SD_CSD_RW_BL_LEN_2G		0xa
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| #define  SD_CSD_RW_BL_LEN_1G		0x9
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| #define SD_CSD_WRITE_BL_PARTIAL(resp)	MMC_RSP_BITS((resp), 21, 1)
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| #define SD_CSD_FILE_FORMAT_GRP(resp)	MMC_RSP_BITS((resp), 15, 1)
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| #define SD_CSD_COPY(resp)		MMC_RSP_BITS((resp), 14, 1)
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| #define SD_CSD_PERM_WRITE_PROTECT(resp)	MMC_RSP_BITS((resp), 13, 1)
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| #define SD_CSD_TMP_WRITE_PROTECT(resp)	MMC_RSP_BITS((resp), 12, 1)
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| #define SD_CSD_FILE_FORMAT(resp)	MMC_RSP_BITS((resp), 10, 2)
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| 
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| /* SD R2 response (CID) */
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| #define SD_CID_MID(resp)		MMC_RSP_BITS((resp), 120, 8)
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| #define SD_CID_OID(resp)		MMC_RSP_BITS((resp), 104, 16)
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| #define SD_CID_PNM_CPY(resp, pnm)					\
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| 	do {								\
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| 		(pnm)[0] = MMC_RSP_BITS((resp), 96, 8);			\
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| 		(pnm)[1] = MMC_RSP_BITS((resp), 88, 8);			\
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| 		(pnm)[2] = MMC_RSP_BITS((resp), 80, 8);			\
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| 		(pnm)[3] = MMC_RSP_BITS((resp), 72, 8);			\
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| 		(pnm)[4] = MMC_RSP_BITS((resp), 64, 8);			\
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| 		(pnm)[5] = '\0';					\
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| 	} while (/*CONSTCOND*/0)
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| #define SD_CID_REV(resp)		MMC_RSP_BITS((resp), 56, 8)
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| #define SD_CID_PSN(resp)		MMC_RSP_BITS((resp), 24, 32)
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| #define SD_CID_MDT(resp)		MMC_RSP_BITS((resp), 8, 12)
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| 
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| /* SCR (SD Configuration Register) */
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| #define SCR_STRUCTURE(scr)		MMC_RSP_BITS((scr), 60, 4)
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| #define  SCR_STRUCTURE_VER_1_0		0 /* Version 1.0 */
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| #define SCR_SD_SPEC(scr)		MMC_RSP_BITS((scr), 56, 4)
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| #define  SCR_SD_SPEC_VER_1_0		0 /* Version 1.0 and 1.01 */
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| #define  SCR_SD_SPEC_VER_1_10		1 /* Version 1.10 */
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| #define  SCR_SD_SPEC_VER_2		2 /* Version 2.00 or Version 3.0X */
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| #define SCR_DATA_STAT_AFTER_ERASE(scr)	MMC_RSP_BITS((scr), 55, 1)
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| #define SCR_SD_SECURITY(scr)		MMC_RSP_BITS((scr), 52, 3)
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| #define  SCR_SD_SECURITY_NONE		0 /* no security */
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| #define  SCR_SD_SECURITY_1_0		1 /* security protocol 1.0 */
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| #define  SCR_SD_SECURITY_1_0_2		2 /* security protocol 1.0 */
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| #define SCR_SD_BUS_WIDTHS(scr)		MMC_RSP_BITS((scr), 48, 4)
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| #define  SCR_SD_BUS_WIDTHS_1BIT		(1 << 0) /* 1bit (DAT0) */
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| #define  SCR_SD_BUS_WIDTHS_4BIT		(1 << 2) /* 4bit (DAT0-3) */
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| #define SCR_RESERVED(scr)		MMC_RSP_BITS((scr), 32, 16)
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| #define SCR_RESERVED2(scr)		MMC_RSP_BITS((scr), 0, 32)
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| 
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| /* Status of Switch Function */
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| #define SFUNC_STATUS_GROUP(status, group) \
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| 	be16toh(__bitfield((uint32_t *)(status), (7 - (group)) << 4, 16))
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| 
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| /* Might be slow, but it should work on big and little endian systems. */
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| 
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| 
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| /* The macro used to do a (start)-8 to work around a bug in hardware see sdhc.c
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|  * of the openbsd mmc code driver.
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|  */
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| #define MMC_RSP_BITS(resp, start, len)	__bitfield((resp), (start), (len))
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| static inline int
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| __bitfield(uint32_t *src, int start, int len)
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| {
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| 	uint8_t *sp;
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| 	uint32_t dst, mask;
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| 	int shift, bs, bc;
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| 
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| 	if (start < 0 || len < 0 || len > 32)
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| 		return 0;
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| 
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| 	dst = 0;
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| 	mask = len % 32 ? UINT_MAX >> (32 - (len % 32)) : UINT_MAX;
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| 	shift = 0;
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| 
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| 	while (len > 0) {
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| 		sp = (uint8_t *)src + start / 8;
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| 		bs = start % 8;
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| 		bc = 8 - bs;
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| 		if (bc > len)
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| 			bc = len;
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| 		dst |= (*sp >> bs) << shift;
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| 		shift += bc;
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| 		start += bc;
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| 		len -= bc;
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| 	}
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| 
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| 	dst &= mask;
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| 	return (int)dst;
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| }
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| 
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| #endif	/* _SDMMCREG_H_ */
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