diff options
| -rw-r--r-- | drivers/mmc/mmc_block.c | 5 | ||||
| -rw-r--r-- | include/linux/mmc/protocol.h | 27 |
2 files changed, 31 insertions, 1 deletions
diff --git a/drivers/mmc/mmc_block.c b/drivers/mmc/mmc_block.c index b5b4a7b1190..d4eee99c2bf 100644 --- a/drivers/mmc/mmc_block.c +++ b/drivers/mmc/mmc_block.c @@ -383,7 +383,10 @@ static int mmc_blk_probe(struct mmc_card *card) struct mmc_blk_data *md; int err; - if (card->csd.cmdclass & ~0x1ff) + /* + * Check that the card supports the command class(es) we need. + */ + if (!(card->csd.cmdclass & CCC_BLOCK_READ)) return -ENODEV; if (card->csd.read_blkbits < 9) { diff --git a/include/linux/mmc/protocol.h b/include/linux/mmc/protocol.h index 7b904c5102f..896342817b9 100644 --- a/include/linux/mmc/protocol.h +++ b/include/linux/mmc/protocol.h @@ -195,6 +195,33 @@ struct _mmc_csd { #define MMC_VDD_35_36 0x00800000 /* VDD voltage 3.5 ~ 3.6 */ #define MMC_CARD_BUSY 0x80000000 /* Card Power up status bit */ +/* + * Card Command Classes (CCC) + */ +#define CCC_BASIC (1<<0) /* (0) Basic protocol functions */ + /* (CMD0,1,2,3,4,7,9,10,12,13,15) */ +#define CCC_STREAM_READ (1<<1) /* (1) Stream read commands */ + /* (CMD11) */ +#define CCC_BLOCK_READ (1<<2) /* (2) Block read commands */ + /* (CMD16,17,18) */ +#define CCC_STREAM_WRITE (1<<3) /* (3) Stream write commands */ + /* (CMD20) */ +#define CCC_BLOCK_WRITE (1<<4) /* (4) Block write commands */ + /* (CMD16,24,25,26,27) */ +#define CCC_ERASE (1<<5) /* (5) Ability to erase blocks */ + /* (CMD32,33,34,35,36,37,38,39) */ +#define CCC_WRITE_PROT (1<<6) /* (6) Able to write protect blocks */ + /* (CMD28,29,30) */ +#define CCC_LOCK_CARD (1<<7) /* (7) Able to lock down card */ + /* (CMD16,CMD42) */ +#define CCC_APP_SPEC (1<<8) /* (8) Application specific */ + /* (CMD55,56,57,ACMD*) */ +#define CCC_IO_MODE (1<<9) /* (9) I/O mode */ + /* (CMD5,39,40,52,53) */ +#define CCC_SWITCH (1<<10) /* (10) High speed switch */ + /* (CMD6,34,35,36,37,50) */ + /* (11) Reserved */ + /* (CMD?) */ /* * CSD field definitions |