linux-toradex.git/include/linux/mmc/card.h, branch tegra-11.2.2

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

sdio: allow non-standard SDIO cards

2010-08-11T15:59:04+00:00

There are some chips (like TI WL12xx series) that can be interfaced over
SDIO but don't support the SDIO specification, meaning that they are
missing CIA (Common I/O Area) with all it's registers.  Current Linux SDIO
implementation relies on those registers to identify and configure the
card, so non-standard cards can not function and cause lots of warnings
from the core when it reads invalid data from non-existent registers.

After this patch, init_card() host callback can now set new quirk
MMC_QUIRK_NONSTD_SDIO, which means that SDIO core should not try to access
any standard SDIO registers and rely on init_card() to fill all SDIO
structures instead.  As those cards are usually embedded chips, all the
required information can be obtained from machine board files by the host
driver when it's called through init_card() callback.

Signed-off-by: Grazvydas Ignotas 
Cc: Adrian Hunter 
Cc: Tony Lindgren 
Cc: Bob Copeland 
Cc: Kalle Valo 
Cc: Madhusudhan Chikkature 
Cc: Kishore Kadiyala 
Cc: Russell King 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mmc: implement SD-combo (IO+mem) support

2010-08-11T15:59:03+00:00

Signed-off-by: Michal Miroslaw 
Cc: Adrian Hunter 
Cc: Chris Ball 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mmc: recognize CSD structure

2010-08-11T15:59:02+00:00

The eMMC spec 4.4 and 4.3 + additional feature chips has CSD structure
version 3 and version 3 have to check the CSD_STRUCTURE byte in the
EXT_CSD register.

Also fix EXT_CSD revision message.

[akpm@linux-foundation.org: fix comment, per Chris Ball]
Signed-off-by: Kyungmin Park 
Cc: Adrian Hunter 
Cc: Chris Ball 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

sdio: add quirk to clamp byte mode transfer

2010-03-06T19:26:36+00:00

Some SDIO cards expect byte transfers not to exceed the configured block
transfer size.  Add a quirk to that effect.

Patches to make use of this quirk will be sent separately.

Signed-off-by: Bing Zhao 
Signed-off-by: Nicolas Pitre 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

sdio: add MMC_QUIRK_LENIENT_FN0

2009-09-23T14:39:37+00:00

Normally writes to SDIO function 0 outside the vendor specific CCCR
registers are prohibited.

To support embedded devices that require writes to SDIO function 0 outside
this range (e.g.  TI WL127x embedded sdio wifi device),
MMC_QUIRK_LENIENT_FN0 is introduced.

A card quirks field is added to `struct mmc_card' to support non-standard
devices (e.g.  embedded sdio devices).

[akpm@linux-foundation.org: code in C, not cpp!]
Signed-off-by: Ohad Ben-Cohen 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

sdio: add CD disable support

2009-09-23T14:39:36+00:00

Add support to disconnect the pull-up resistor on CD/DAT[3] (pin 1)
of the card. This may be desired on certain setups of boards,
controllers and embedded sdio devices which do not need the card's
pull-up. As a result, card detection is disabled and power is saved.

[akpm@linux-foundation.org: simplify sdio_disable_cd() a bit]
Signed-off-by: Ohad Ben-Cohen 
Acked-by: Matt Fleming 
Cc: Ian Molton 
Cc: "Roberto A. Foglietta" 
Cc: Philip Langdale 
Cc: Pierre Ossman 
Cc: David Vrabel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mmc: add mmc card sleep and awake support

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

Add support for the new MMC command SLEEP_AWAKE.

Signed-off-by: Jarkko Lavinen 
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: struct device - replace bus_id with dev_name(), dev_set_name()

2008-11-08T20:37:46+00:00

Acked-by: Greg Kroah-Hartman 
Signed-Off-By: Kay Sievers 
Signed-off-by: Pierre Ossman

mmc: Add per-card debugfs support

2008-07-26T23:26:17+00:00

For each card successfully added to the bus, create a subdirectory under
the host's debugfs root with information about the card.

At the moment, only a single file is added to the card directory for
all cards: "state". It reflects the "state" field in struct mmc_card,
indicating whether the card is present, readonly, etc.

For MMC and SD cards (not SDIO), another file is added: "status".
Reading this file will ask the card about its current status and
return it. This can be useful if the card just refuses to respond to
any commands, which might indicate that the card state is not what the
MMC core thinks it is (due to a missing stop command, for example.)

Signed-off-by: Haavard Skinnemoen 
Signed-off-by: Pierre Ossman