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sdmmcreg.h revision 1.7
      1 /*	$NetBSD: sdmmcreg.h,v 1.7 2011/02/13 07:25:56 nonaka Exp $	*/
      2 /*	$OpenBSD: sdmmcreg.h,v 1.4 2009/01/09 10:55:22 jsg Exp $	*/
      3 
      4 /*
      5  * Copyright (c) 2006 Uwe Stuehler <uwe (at) openbsd.org>
      6  *
      7  * Permission to use, copy, modify, and distribute this software for any
      8  * purpose with or without fee is hereby granted, provided that the above
      9  * copyright notice and this permission notice appear in all copies.
     10  *
     11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     18  */
     19 
     20 #ifndef	_SDMMCREG_H_
     21 #define	_SDMMCREG_H_
     22 
     23 /* MMC commands */				/* response type */
     24 #define MMC_GO_IDLE_STATE		0	/* R0 */
     25 #define MMC_SEND_OP_COND		1	/* R3 */
     26 #define MMC_ALL_SEND_CID		2	/* R2 */
     27 #define MMC_SET_RELATIVE_ADDR 	  	3	/* R1 */
     28 #define MMC_SWITCH			6	/* R1b */
     29 #define MMC_SELECT_CARD			7	/* R1 */
     30 #define MMC_SEND_EXT_CSD		8	/* R1 */
     31 #define MMC_SEND_CSD			9	/* R2 */
     32 #define MMC_SEND_CID			10	/* R2 */
     33 #define MMC_STOP_TRANSMISSION		12	/* R1b */
     34 #define MMC_SEND_STATUS			13	/* R1 */
     35 #define MMC_INACTIVE_STATE		15	/* R0 */
     36 #define MMC_SET_BLOCKLEN		16	/* R1 */
     37 #define MMC_READ_BLOCK_SINGLE		17	/* R1 */
     38 #define MMC_READ_BLOCK_MULTIPLE		18	/* R1 */
     39 #define MMC_SET_BLOCK_COUNT		23	/* R1 */
     40 #define MMC_WRITE_BLOCK_SINGLE		24	/* R1 */
     41 #define MMC_WRITE_BLOCK_MULTIPLE	25	/* R1 */
     42 #define MMC_PROGRAM_CSD			27	/* R1 */
     43 #define MMC_SET_WRITE_PROT		28	/* R1b */
     44 #define MMC_SET_CLR_WRITE_PROT		29	/* R1b */
     45 #define MMC_SET_SEND_WRITE_PROT		30	/* R1 */
     46 #define MMC_TAG_SECTOR_START		32	/* R1 */
     47 #define MMC_TAG_SECTOR_END		33	/* R1 */
     48 #define MMC_UNTAG_SECTOR		34	/* R1 */
     49 #define MMC_TAG_ERASE_GROUP_START	35	/* R1 */
     50 #define MMC_TAG_ERASE_GROUP_END		36	/* R1 */
     51 #define MMC_UNTAG_ERASE_GROUP		37	/* R1 */
     52 #define MMC_ERASE			38	/* R1b */
     53 #define MMC_LOCK_UNLOCK			42	/* R1b */
     54 #define MMC_APP_CMD			55	/* R1 */
     55 #define MMC_READ_OCR			58	/* R3 */
     56 
     57 /* SD commands */			/* response type */
     58 #define SD_SEND_RELATIVE_ADDR 	  	3	/* R6 */
     59 #define SD_SEND_SWITCH_FUNC		6	/* R1 */
     60 #define SD_SEND_IF_COND			8	/* R7 */
     61 
     62 /* SD application commands */			/* response type */
     63 #define SD_APP_SET_BUS_WIDTH		6	/* R1 */
     64 #define SD_APP_OP_COND			41	/* R3 */
     65 #define SD_APP_SEND_SCR			51	/* R1 */
     66 
     67 /* OCR bits */
     68 #define MMC_OCR_MEM_READY		(1U<<31)/* memory power-up status bit */
     69 #define MMC_OCR_HCS			(1<<30)
     70 #define MMC_OCR_3_5V_3_6V		(1<<23)
     71 #define MMC_OCR_3_4V_3_5V		(1<<22)
     72 #define MMC_OCR_3_3V_3_4V		(1<<21)
     73 #define MMC_OCR_3_2V_3_3V		(1<<20)
     74 #define MMC_OCR_3_1V_3_2V		(1<<19)
     75 #define MMC_OCR_3_0V_3_1V		(1<<18)
     76 #define MMC_OCR_2_9V_3_0V		(1<<17)
     77 #define MMC_OCR_2_8V_2_9V		(1<<16)
     78 #define MMC_OCR_2_7V_2_8V		(1<<15)
     79 #define MMC_OCR_2_6V_2_7V		(1<<14)
     80 #define MMC_OCR_2_5V_2_6V		(1<<13)
     81 #define MMC_OCR_2_4V_2_5V		(1<<12)
     82 #define MMC_OCR_2_3V_2_4V		(1<<11)
     83 #define MMC_OCR_2_2V_2_3V		(1<<10)
     84 #define MMC_OCR_2_1V_2_2V		(1<<9)
     85 #define MMC_OCR_2_0V_2_1V		(1<<8)
     86 #define MMC_OCR_1_9V_2_0V		(1<<7)
     87 #define MMC_OCR_1_8V_1_9V		(1<<6)
     88 #define MMC_OCR_1_7V_1_8V		(1<<5)
     89 #define MMC_OCR_1_6V_1_7V		(1<<4)
     90 
     91 /* R1 response type bits */
     92 #define MMC_R1_READY_FOR_DATA		(1<<8)	/* ready for next transfer */
     93 #define MMC_R1_APP_CMD			(1<<5)	/* app. commands supported */
     94 
     95 /* 48-bit response decoding (32 bits w/o CRC) */
     96 #define MMC_R1(resp)			((resp)[0])
     97 #define MMC_R3(resp)			((resp)[0])
     98 #define SD_R6(resp)			((resp)[0])
     99 #define MMC_R7(resp)			((resp)[0])
    100 #define MMC_SPI_R1(resp)		((resp)[0])
    101 #define MMC_SPI_R7(resp)		((resp)[1])
    102 
    103 /* RCA argument and response */
    104 #define MMC_ARG_RCA(rca)		((rca) << 16)
    105 #define SD_R6_RCA(resp)			(SD_R6((resp)) >> 16)
    106 
    107 /* bus width argument */
    108 #define SD_ARG_BUS_WIDTH_1		0
    109 #define SD_ARG_BUS_WIDTH_4		2
    110 
    111 /* EXT_CSD fields */
    112 #define EXT_CSD_BUS_WIDTH		183	/* WO */
    113 #define EXT_CSD_HS_TIMING		185	/* R/W */
    114 #define EXT_CSD_REV			192	/* RO */
    115 #define EXT_CSD_STRUCTURE		194	/* RO */
    116 #define EXT_CSD_CARD_TYPE		196	/* RO */
    117 
    118 /* EXT_CSD field definitions */
    119 #define EXT_CSD_CMD_SET_NORMAL		(1U << 0)
    120 #define EXT_CSD_CMD_SET_SECURE		(1U << 1)
    121 #define EXT_CSD_CMD_SET_CPSECURE	(1U << 2)
    122 
    123 /* EXT_CSD_BUS_WIDTH */
    124 #define EXT_CSD_BUS_WIDTH_1		0	/* 1 bit mode */
    125 #define EXT_CSD_BUS_WIDTH_4		1	/* 4 bit mode */
    126 #define EXT_CSD_BUS_WIDTH_8		2	/* 8 bit mode */
    127 
    128 /* EXT_CSD_STRUCTURE */
    129 #define EXT_CSD_STRUCTURE_VER_1_0	0	/* CSD Version No.1.0 */
    130 #define EXT_CSD_STRUCTURE_VER_1_1	1	/* CSD Version No.1.1 */
    131 #define EXT_CSD_STRUCTURE_VER_1_2	2	/* Version 4.1-4.2-4.3 */
    132 
    133 /* EXT_CSD_CARD_TYPE */
    134 #define EXT_CSD_CARD_TYPE_26M		(1 << 0)
    135 #define EXT_CSD_CARD_TYPE_52M		(1 << 1)
    136 
    137 /* MMC_SWITCH access mode */
    138 #define MMC_SWITCH_MODE_CMD_SET		0x00	/* Change the command set */
    139 #define MMC_SWITCH_MODE_SET_BITS	0x01	/* Set bits in value */
    140 #define MMC_SWITCH_MODE_CLEAR_BITS	0x02	/* Clear bits in value */
    141 #define MMC_SWITCH_MODE_WRITE_BYTE	0x03	/* Set target to value */
    142 
    143 /* SPI mode reports R1/R2(SEND_STATUS) status. */
    144 #define R1_SPI_IDLE		(1 << 0)
    145 #define R1_SPI_ERASE_RESET	(1 << 1)
    146 #define R1_SPI_ILLEGAL_COMMAND	(1 << 2)
    147 #define R1_SPI_COM_CRC		(1 << 3)
    148 #define R1_SPI_ERASE_SEQ	(1 << 4)
    149 #define R1_SPI_ADDRESS		(1 << 5)
    150 #define R1_SPI_PARAMETER	(1 << 6)
    151 /* R1 bit 7 is always zero */
    152 #define R2_SPI_CARD_LOCKED	(1 << 8)
    153 #define R2_SPI_WP_ERASE_SKIP	(1 << 9)	/* or lock/unlock fail */
    154 #define R2_SPI_LOCK_UNLOCK_FAIL	R2_SPI_WP_ERASE_SKIP
    155 #define R2_SPI_ERROR		(1 << 10)
    156 #define R2_SPI_CC_ERROR		(1 << 11)
    157 #define R2_SPI_CARD_ECC_ERROR	(1 << 12)
    158 #define R2_SPI_WP_VIOLATION	(1 << 13)
    159 #define R2_SPI_ERASE_PARAM	(1 << 14)
    160 #define R2_SPI_OUT_OF_RANGE	(1 << 15)	/* or CSD overwrite */
    161 #define R2_SPI_CSD_OVERWRITE	R2_SPI_OUT_OF_RANGE
    162 
    163 /* MMC R2 response (CSD) */
    164 #define MMC_CSD_CSDVER(resp)		MMC_RSP_BITS((resp), 126, 2)
    165 #define  MMC_CSD_CSDVER_1_0		0
    166 #define  MMC_CSD_CSDVER_1_1		1
    167 #define  MMC_CSD_CSDVER_1_2		2 /* MMC 4.1 - 4.2 - 4.3 */
    168 #define  MMC_CSD_CSDVER_EXT_CSD		3 /* Version is coded in CSD_STRUCTURE in EXT_CSD */
    169 #define MMC_CSD_MMCVER(resp)		MMC_RSP_BITS((resp), 122, 4)
    170 #define  MMC_CSD_MMCVER_1_0		0 /* MMC 1.0 - 1.2 */
    171 #define  MMC_CSD_MMCVER_1_4		1 /* MMC 1.4 */
    172 #define  MMC_CSD_MMCVER_2_0		2 /* MMC 2.0 - 2.2 */
    173 #define  MMC_CSD_MMCVER_3_1		3 /* MMC 3.1 - 3.3 */
    174 #define  MMC_CSD_MMCVER_4_0		4 /* MMC 4.1 - 4.2 - 4.3 */
    175 #define MMC_CSD_TAAC(resp)		MMC_RSP_BITS((resp), 112, 8)
    176 #define MMC_CSD_TAAC_MANT(resp)		MMC_RSP_BITS((resp), 115, 4)
    177 #define MMC_CSD_TAAC_EXP(resp)		MMC_RSP_BITS((resp), 112, 3)
    178 #define MMC_CSD_NSAC(resp)		MMC_RSP_BITS((resp), 104, 8)
    179 #define MMC_CSD_TRAN_SPEED(resp)	MMC_RSP_BITS((resp), 96, 8)
    180 #define MMC_CSD_TRAN_SPEED_MANT(resp)	MMC_RSP_BITS((resp), 99, 4)
    181 #define MMC_CSD_TRAN_SPEED_EXP(resp)	MMC_RSP_BITS((resp), 96, 3)
    182 #define MMC_CSD_READ_BL_LEN(resp)	MMC_RSP_BITS((resp), 80, 4)
    183 #define MMC_CSD_C_SIZE(resp)		MMC_RSP_BITS((resp), 62, 12)
    184 #define MMC_CSD_CAPACITY(resp)		((MMC_CSD_C_SIZE((resp))+1) << \
    185 					 (MMC_CSD_C_SIZE_MULT((resp))+2))
    186 #define MMC_CSD_C_SIZE_MULT(resp)	MMC_RSP_BITS((resp), 47, 3)
    187 #define MMC_CSD_R2W_FACTOR(resp)	MMC_RSP_BITS((resp), 26, 3)
    188 #define MMC_CSD_WRITE_BL_LEN(resp)	MMC_RSP_BITS((resp), 22, 4)
    189 
    190 /* MMC v1 R2 response (CID) */
    191 #define MMC_CID_MID_V1(resp)		MMC_RSP_BITS((resp), 104, 24)
    192 #define MMC_CID_PNM_V1_CPY(resp, pnm)					\
    193 	do {								\
    194 		(pnm)[0] = MMC_RSP_BITS((resp), 96, 8);			\
    195 		(pnm)[1] = MMC_RSP_BITS((resp), 88, 8);			\
    196 		(pnm)[2] = MMC_RSP_BITS((resp), 80, 8);			\
    197 		(pnm)[3] = MMC_RSP_BITS((resp), 72, 8);			\
    198 		(pnm)[4] = MMC_RSP_BITS((resp), 64, 8);			\
    199 		(pnm)[5] = MMC_RSP_BITS((resp), 56, 8);			\
    200 		(pnm)[6] = MMC_RSP_BITS((resp), 48, 8);			\
    201 		(pnm)[7] = '\0';					\
    202 	} while (/*CONSTCOND*/0)
    203 #define MMC_CID_REV_V1(resp)		MMC_RSP_BITS((resp), 40, 8)
    204 #define MMC_CID_PSN_V1(resp)		MMC_RSP_BITS((resp), 16, 24)
    205 #define MMC_CID_MDT_V1(resp)		MMC_RSP_BITS((resp), 8, 8)
    206 
    207 /* MMC v2 R2 response (CID) */
    208 #define MMC_CID_MID_V2(resp)		MMC_RSP_BITS((resp), 120, 8)
    209 #define MMC_CID_OID_V2(resp)		MMC_RSP_BITS((resp), 104, 16)
    210 #define MMC_CID_PNM_V2_CPY(resp, pnm)					\
    211 	do {								\
    212 		(pnm)[0] = MMC_RSP_BITS((resp), 96, 8);			\
    213 		(pnm)[1] = MMC_RSP_BITS((resp), 88, 8);			\
    214 		(pnm)[2] = MMC_RSP_BITS((resp), 80, 8);			\
    215 		(pnm)[3] = MMC_RSP_BITS((resp), 72, 8);			\
    216 		(pnm)[4] = MMC_RSP_BITS((resp), 64, 8);			\
    217 		(pnm)[5] = MMC_RSP_BITS((resp), 56, 8);			\
    218 		(pnm)[6] = '\0';					\
    219 	} while (/*CONSTCOND*/0)
    220 #define MMC_CID_PSN_V2(resp)		MMC_RSP_BITS((resp), 16, 32)
    221 
    222 /* SD R2 response (CSD) */
    223 #define SD_CSD_CSDVER(resp)		MMC_RSP_BITS((resp), 126, 2)
    224 #define  SD_CSD_CSDVER_1_0		0
    225 #define  SD_CSD_CSDVER_2_0		1
    226 #define SD_CSD_MMCVER(resp)		MMC_RSP_BITS((resp), 122, 4)
    227 #define SD_CSD_TAAC(resp)		MMC_RSP_BITS((resp), 112, 8)
    228 #define SD_CSD_TAAC_EXP(resp)		MMC_RSP_BITS((resp), 115, 4)
    229 #define SD_CSD_TAAC_MANT(resp)		MMC_RSP_BITS((resp), 112, 3)
    230 #define  SD_CSD_TAAC_1_5_MSEC		0x26
    231 #define SD_CSD_NSAC(resp)		MMC_RSP_BITS((resp), 104, 8)
    232 #define SD_CSD_SPEED(resp)		MMC_RSP_BITS((resp), 96, 8)
    233 #define SD_CSD_SPEED_MANT(resp)		MMC_RSP_BITS((resp), 99, 4)
    234 #define SD_CSD_SPEED_EXP(resp)		MMC_RSP_BITS((resp), 96, 3)
    235 #define  SD_CSD_SPEED_25_MHZ		0x32
    236 #define  SD_CSD_SPEED_50_MHZ		0x5a
    237 #define SD_CSD_CCC(resp)		MMC_RSP_BITS((resp), 84, 12)
    238 #define  SD_CSD_CCC_BASIC		(1 << 0)	/* basic */
    239 #define  SD_CSD_CCC_BR			(1 << 2)	/* block read */
    240 #define  SD_CSD_CCC_BW			(1 << 4)	/* block write */
    241 #define  SD_CSD_CCC_ERACE		(1 << 5)	/* erase */
    242 #define  SD_CSD_CCC_WP			(1 << 6)	/* write protection */
    243 #define  SD_CSD_CCC_LC			(1 << 7)	/* lock card */
    244 #define  SD_CSD_CCC_AS			(1 << 8)	/*application specific*/
    245 #define  SD_CSD_CCC_IOM			(1 << 9)	/* I/O mode */
    246 #define  SD_CSD_CCC_SWITCH		(1 << 10)	/* switch */
    247 #define SD_CSD_READ_BL_LEN(resp)	MMC_RSP_BITS((resp), 80, 4)
    248 #define SD_CSD_READ_BL_PARTIAL(resp)	MMC_RSP_BITS((resp), 79, 1)
    249 #define SD_CSD_WRITE_BLK_MISALIGN(resp)	MMC_RSP_BITS((resp), 78, 1)
    250 #define SD_CSD_READ_BLK_MISALIGN(resp)	MMC_RSP_BITS((resp), 77, 1)
    251 #define SD_CSD_DSR_IMP(resp)		MMC_RSP_BITS((resp), 76, 1)
    252 #define SD_CSD_C_SIZE(resp)		MMC_RSP_BITS((resp), 62, 12)
    253 #define SD_CSD_CAPACITY(resp)		((SD_CSD_C_SIZE((resp))+1) << \
    254 					 (SD_CSD_C_SIZE_MULT((resp))+2))
    255 #define SD_CSD_VDD_R_CURR_MIN(resp)	MMC_RSP_BITS((resp), 59, 3)
    256 #define SD_CSD_VDD_R_CURR_MAX(resp)	MMC_RSP_BITS((resp), 56, 3)
    257 #define SD_CSD_VDD_W_CURR_MIN(resp)	MMC_RSP_BITS((resp), 53, 3)
    258 #define SD_CSD_VDD_W_CURR_MAX(resp)	MMC_RSP_BITS((resp), 50, 3)
    259 #define  SD_CSD_VDD_RW_CURR_100mA	0x7
    260 #define  SD_CSD_VDD_RW_CURR_80mA	0x6
    261 #define SD_CSD_V2_C_SIZE(resp)		MMC_RSP_BITS((resp), 48, 22)
    262 #define SD_CSD_V2_CAPACITY(resp)	((SD_CSD_V2_C_SIZE((resp))+1) << 10)
    263 #define SD_CSD_V2_BL_LEN		0x9 /* 512 */
    264 #define SD_CSD_C_SIZE_MULT(resp)	MMC_RSP_BITS((resp), 47, 3)
    265 #define SD_CSD_ERASE_BLK_EN(resp)	MMC_RSP_BITS((resp), 46, 1)
    266 #define SD_CSD_SECTOR_SIZE(resp)	MMC_RSP_BITS((resp), 39, 7) /* +1 */
    267 #define SD_CSD_WP_GRP_SIZE(resp)	MMC_RSP_BITS((resp), 32, 7) /* +1 */
    268 #define SD_CSD_WP_GRP_ENABLE(resp)	MMC_RSP_BITS((resp), 31, 1)
    269 #define SD_CSD_R2W_FACTOR(resp)		MMC_RSP_BITS((resp), 26, 3)
    270 #define SD_CSD_WRITE_BL_LEN(resp)	MMC_RSP_BITS((resp), 22, 4)
    271 #define  SD_CSD_RW_BL_LEN_2G		0xa
    272 #define  SD_CSD_RW_BL_LEN_1G		0x9
    273 #define SD_CSD_WRITE_BL_PARTIAL(resp)	MMC_RSP_BITS((resp), 21, 1)
    274 #define SD_CSD_FILE_FORMAT_GRP(resp)	MMC_RSP_BITS((resp), 15, 1)
    275 #define SD_CSD_COPY(resp)		MMC_RSP_BITS((resp), 14, 1)
    276 #define SD_CSD_PERM_WRITE_PROTECT(resp)	MMC_RSP_BITS((resp), 13, 1)
    277 #define SD_CSD_TMP_WRITE_PROTECT(resp)	MMC_RSP_BITS((resp), 12, 1)
    278 #define SD_CSD_FILE_FORMAT(resp)	MMC_RSP_BITS((resp), 10, 2)
    279 
    280 /* SD R2 response (CID) */
    281 #define SD_CID_MID(resp)		MMC_RSP_BITS((resp), 120, 8)
    282 #define SD_CID_OID(resp)		MMC_RSP_BITS((resp), 104, 16)
    283 #define SD_CID_PNM_CPY(resp, pnm)					\
    284 	do {								\
    285 		(pnm)[0] = MMC_RSP_BITS((resp), 96, 8);			\
    286 		(pnm)[1] = MMC_RSP_BITS((resp), 88, 8);			\
    287 		(pnm)[2] = MMC_RSP_BITS((resp), 80, 8);			\
    288 		(pnm)[3] = MMC_RSP_BITS((resp), 72, 8);			\
    289 		(pnm)[4] = MMC_RSP_BITS((resp), 64, 8);			\
    290 		(pnm)[5] = '\0';					\
    291 	} while (/*CONSTCOND*/0)
    292 #define SD_CID_REV(resp)		MMC_RSP_BITS((resp), 56, 8)
    293 #define SD_CID_PSN(resp)		MMC_RSP_BITS((resp), 24, 32)
    294 #define SD_CID_MDT(resp)		MMC_RSP_BITS((resp), 8, 12)
    295 
    296 /* SCR (SD Configuration Register) */
    297 #define SCR_STRUCTURE(scr)		MMC_RSP_BITS((scr), 60, 4)
    298 #define  SCR_STRUCTURE_VER_1_0		0 /* Version 1.0 */
    299 #define SCR_SD_SPEC(scr)		MMC_RSP_BITS((scr), 56, 4)
    300 #define  SCR_SD_SPEC_VER_1_0		0 /* Version 1.0 and 1.01 */
    301 #define  SCR_SD_SPEC_VER_1_10		1 /* Version 1.10 */
    302 #define  SCR_SD_SPEC_VER_2		2 /* Version 2.00 or Version 3.0X */
    303 #define SCR_DATA_STAT_AFTER_ERASE(scr)	MMC_RSP_BITS((scr), 55, 1)
    304 #define SCR_SD_SECURITY(scr)		MMC_RSP_BITS((scr), 52, 3)
    305 #define  SCR_SD_SECURITY_NONE		0 /* no security */
    306 #define  SCR_SD_SECURITY_1_0		1 /* security protocol 1.0 */
    307 #define  SCR_SD_SECURITY_1_0_2		2 /* security protocol 1.0 */
    308 #define SCR_SD_BUS_WIDTHS(scr)		MMC_RSP_BITS((scr), 48, 4)
    309 #define  SCR_SD_BUS_WIDTHS_1BIT		(1 << 0) /* 1bit (DAT0) */
    310 #define  SCR_SD_BUS_WIDTHS_4BIT		(1 << 2) /* 4bit (DAT0-3) */
    311 #define SCR_RESERVED(scr)		MMC_RSP_BITS((scr), 32, 16)
    312 #define SCR_RESERVED2(scr)		MMC_RSP_BITS((scr), 0, 32)
    313 
    314 /* Status of Switch Function */
    315 #define SFUNC_STATUS_GROUP(status, group) \
    316 	be16toh(__bitfield((uint32_t *)(status), (7 - (group)) << 4, 16))
    317 
    318 /* Might be slow, but it should work on big and little endian systems. */
    319 #define MMC_RSP_BITS(resp, start, len)	__bitfield((resp), (start)-8, (len))
    320 static inline int
    321 __bitfield(uint32_t *src, int start, int len)
    322 {
    323 	uint8_t *sp;
    324 	uint32_t dst, mask;
    325 	int shift, bs, bc;
    326 
    327 	if (start < 0 || len < 0 || len > 32)
    328 		return 0;
    329 
    330 	dst = 0;
    331 	mask = len % 32 ? UINT_MAX >> (32 - (len % 32)) : UINT_MAX;
    332 	shift = 0;
    333 
    334 	while (len > 0) {
    335 		sp = (uint8_t *)src + start / 8;
    336 		bs = start % 8;
    337 		bc = 8 - bs;
    338 		if (bc > len)
    339 			bc = len;
    340 		dst |= (*sp++ >> bs) << shift;
    341 		shift += bc;
    342 		start += bc;
    343 		len -= bc;
    344 	}
    345 
    346 	dst &= mask;
    347 	return (int)dst;
    348 }
    349 
    350 #endif	/* _SDMMCREG_H_ */
    351