linux-toradex.git/include/linux/mmc/core.h, branch tegra-11.2.10

MMC: Expose mmc_switch to higher drivers.

2011-04-08T00:53:31+00:00

Needed for Sandisk workaround (manipulate EXT_CSD).

Change-Id: I7bfe50a1503ac73ae072db718b60c27526521e41
Signed-off-by: Andrei Warkentin

mmc: add erase, secure erase, trim and secure trim operations

2010-08-12T15:43:30+00:00

SD/MMC cards tend to support an erase operation.  In addition, eMMC v4.4
cards can support secure erase, trim and secure trim operations that are
all variants of the basic erase command.

SD/MMC device attributes "erase_size" and "preferred_erase_size" have been
added.

"erase_size" is the minimum size, in bytes, of an erase operation.  For
MMC, "erase_size" is the erase group size reported by the card.  Note that
"erase_size" does not apply to trim or secure trim operations where the
minimum size is always one 512 byte sector.  For SD, "erase_size" is 512
if the card is block-addressed, 0 otherwise.

SD/MMC cards can erase an arbitrarily large area up to and
including the whole card.  When erasing a large area it may
be desirable to do it in smaller chunks for three reasons:

    1. A single erase command will make all other I/O on the card
       wait.  This is not a problem if the whole card is being erased, but
       erasing one partition will make I/O for another partition on the
       same card wait for the duration of the erase - which could be a
       several minutes.

    2. To be able to inform the user of erase progress.

    3. The erase timeout becomes too large to be very useful.
       Because the erase timeout contains a margin which is multiplied by
       the size of the erase area, the value can end up being several
       minutes for large areas.

"erase_size" is not the most efficient unit to erase (especially for SD
where it is just one sector), hence "preferred_erase_size" provides a good
chunk size for erasing large areas.

For MMC, "preferred_erase_size" is the high-capacity erase size if a card
specifies one, otherwise it is based on the capacity of the card.

For SD, "preferred_erase_size" is the allocation unit size specified by
the card.

"preferred_erase_size" is in bytes.

Signed-off-by: Adrian Hunter 
Acked-by: Jens Axboe 
Cc: Kyungmin Park 
Cc: Madhusudhan Chikkature 
Cc: Christoph Hellwig 
Cc: Ben Gardiner 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mmc: allow host claim / release nesting

2009-09-23T14:39:33+00:00

This change allows the MMC host to be claimed in situations where the host
may or may not have already been claimed.  Also 'mmc_try_claim_host()' is
now exported.

Signed-off-by: Adrian Hunter 
Acked-by: Matt Fleming 
Cc: Ian Molton 
Cc: "Roberto A. Foglietta" 
Cc: Jarkko Lavinen 
Cc: Denis Karpov 
Cc: Pierre Ossman 
Cc: Philip Langdale 
Cc: "Madhusudhan" 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mmc: Add mmc_vddrange_to_ocrmask() helper function

2008-12-31T17:18:13+00:00

This function sets the OCR mask bits according to provided voltage
ranges. Will be used by the mmc_spi OpenFirmware bindings.

Signed-off-by: Anton Vorontsov 
Signed-off-by: Pierre Ossman

mmc,sdio: helper function for transfer padding

2008-07-15T12:14:44+00:00

There are a lot of crappy controllers out there that cannot handle
all the request sizes that the MMC/SD/SDIO specifications require.
In case the card driver can pad the data to overcome the problems,
this commit adds a helper that calculates how much that padding
should be.

A corresponding helper is also added for SDIO, but it can also deal
with all the complexities of splitting up a large transfer efficiently.

Signed-off-by: Pierre Ossman

MMC headers learn about SPI

2007-09-23T19:37:51+00:00

Teach the MMC/SD/SDIO system headers that some hosts use SPI mode

 - New host capabilities and status bits
    * MMC_CAP_SPI, with mmc_host_is_spi() test
    * mmc_host.use_spi_crc flag

 - SPI-specific declarations:
    * Response types, MMC_RSP_SPI_R*
    * Two SPI-only commands
    * Status bits used native to SPI:  R1_SPI_*, R2_SPI_*

 - Fix a few (unrelated) whitespace bugs in the headers.

 - Reorder a few mmc_host fields, removing several bytes of padding

None of these changes affect current code.

Signed-off-by: David Brownell 
Signed-off-by: Pierre Ossman

sdio: allow for mmc_claim_host to be aborted

2007-09-23T18:55:13+00:00

It is sometimes necessary to give up on trying to claim the host lock,
especially if that happens in a thread that has to be stopped.

While at it, fix the description for mmc_claim_host() which was wrong.

Signed-off-by: Nicolas Pitre 
Signed-off-by: Pierre Ossman

mmc: implement SDIO IO_RW_DIRECT operation

2007-09-23T17:42:37+00:00

Signed-off-by: Pierre Ossman

mmc: detect SDIO cards

2007-09-23T17:40:07+00:00

Really basic init sequence for SDIO cards.

Signed-off-by: Pierre Ossman

mmc: remove confusing flag

2007-09-23T07:15:12+00:00

The MMC_DATA_MULTI flag never had a proper definition of what it
means, so remove it and let the drivers check the block count in
the request.

Signed-off-by: Pierre Ossman