diff options
| author | Philip Langdale <philipl@overt.org> | 2007-01-04 06:57:32 -0800 |
|---|---|---|
| committer | Pierre Ossman <drzeus@drzeus.cx> | 2007-02-04 20:54:07 +0100 |
| commit | fba68bd2dab1ac99af3c5a963ec9581cfa9f1725 (patch) | |
| tree | 72c43ca8611ebef145e17862189609eb28ecb2d3 /include/linux/mmc/protocol.h | |
| parent | 9e9dc5f29f2eb65153a15c4fdb12b4382e3a75b2 (diff) | |
mmc: Add support for SDHC cards
Thanks to the generous donation of an SDHC card by John Gilmore, and
the surprisingly enlightened decision by the SD Card Association to
publish useful specs, I've been able to bash out support for SDHC. The
changes are not too profound:
i) Add a card flag indicating the card uses block level addressing and
check it in the block driver. As we never took advantage of byte-level
addressing, this simply involves skipping the block -> byte
translation when sending commands.
ii) The layout of the CSD is changed - a set of fields are discarded
to make space for a larger C_SIZE. We did not reference any of the
discarded fields except those related to the C_SIZE.
iii) Read and write timeouts are fixed values and not calculated from
CSD values.
iv) Before invoking SEND_APP_OP_COND, we must invoke the new
SEND_IF_COND to inform the card we support SDHC.
Signed-off-by: Philipl Langdale <philipl@overt.org>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Diffstat (limited to 'include/linux/mmc/protocol.h')
| -rw-r--r-- | include/linux/mmc/protocol.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/include/linux/mmc/protocol.h b/include/linux/mmc/protocol.h index 2dce60c43f4..c90b6768329 100644 --- a/include/linux/mmc/protocol.h +++ b/include/linux/mmc/protocol.h @@ -79,9 +79,12 @@ #define MMC_GEN_CMD 56 /* adtc [0] RD/WR R1 */ /* SD commands type argument response */ - /* class 8 */ + /* class 0 */ /* This is basically the same command as for MMC with some quirks. */ #define SD_SEND_RELATIVE_ADDR 3 /* bcr R6 */ +#define SD_SEND_IF_COND 8 /* bcr [11:0] See below R7 */ + + /* class 10 */ #define SD_SWITCH 6 /* adtc [31:0] See below R1 */ /* Application commands */ @@ -115,6 +118,14 @@ */ /* + * SD_SEND_IF_COND argument format: + * + * [31:12] Reserved (0) + * [11:8] Host Voltage Supply Flags + * [7:0] Check Pattern (0xAA) + */ + +/* MMC status in R1 Type e : error bit |