linux-toradex.git/include/linux/mmc, branch v2.6.36-rc5

mmc: avoid getting CID on SDIO-only cards

2010-09-10T01:57:22+00:00

The introduction of support for SD combo cards breaks the initialization
of all CSR SDIO chips.  The GO_IDLE (CMD0) in mmc_sd_get_cid() causes CSR
chips to be reset (this is non-standard behavior).

When initializing an SDIO card check for a combo card by using the memory
present bit in the R4 response to IO_SEND_OP_COND (CMD5).  This avoids the
call to mmc_sd_get_cid() on an SDIO-only card.

Signed-off-by: David Vrabel 
Acked-by: Michal Mirolaw 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

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: fix all hangs related to mmc/sd card insert/removal during suspend/resume

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

If you don't use CONFIG_MMC_UNSAFE_RESUME, as soon as you attempt to
suspend, the card will be removed, therefore this patch doesn't change the
behavior of this option.

However the removal will be done by pm notifier, which runs while
userspace is still not frozen and thus can freely use del_gendisk, without
the risk of deadlock which would happen otherwise.

Card detect workqueue is now disabled while userspace is frozen, Therefore
if you do use CONFIG_MMC_UNSAFE_RESUME, and remove the card during
suspend, the removal will be detected as soon as userspace is unfrozen,
again at the moment it is safe to call del_gendisk.

Tested with and without CONFIG_MMC_UNSAFE_RESUME with suspend and hibernate.

[akpm@linux-foundation.org: clean up function prototype]
[akpm@linux-foundation.org: fix CONFIG_PM-n linkage, small cleanups]
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Maxim Levitsky 
Cc: David Brownell 
Cc: Alan Stern 
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

sh: add boot code to MMCIF driver header

2010-05-31T04:11:47+00:00

This patch adds a set of MMCIF functions for the romImage
boot loader that allows the kernel to be booted directly
from an MMC card.

Thanks to Jeremy Baker for the initial prototype.

Signed-off-by: Magnus Damm 
Signed-off-by: Paul Mundt

sh: prepare MMCIF driver header file

2010-05-31T04:11:41+00:00

Update the MMCIF driver to include register information
and register access functions in the header file.
The MMCIF boot code builds on top of this.

Signed-off-by: Magnus Damm 
Signed-off-by: Paul Mundt

sdhci-spear: ST SPEAr based SDHCI controller glue

2010-05-27T16:12:40+00:00

Add a glue layer to support the sdhci driver on the ST SPEAr platform.

Signed-off-by: Viresh Kumar 
Cc: 
Cc: Linus Walleij 
Cc: Russell King 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

sdio: add new function for RAW (Read after Write) operation

2010-05-27T16:12:40+00:00

SDIO specification allows RAW (Read after Write) operation using
IO_RW_DIRECT command (CMD52) by setting the RAW bit.  This operation is
similar to ordinary read/write commands, except that both write and read
are performed using single command/response pair.  The Linux SDIO layer
already supports this internaly, only external function is missing for
drivers to make use, which is added by this patch.

This type of command is required to implement proper power save mode
support in wl1251 wifi driver.

Android has similar patch for G1 in it's tree for the same reason:

http://android.git.kernel.org/?p=kernel/common.git;a=commitdiff;h=74a47786f6ecbe6c1cf9fb15efe6a968451deb52

Signed-off-by: Grazvydas Ignotas 
Acked-by: Kalle Valo 
Cc: Dmitry Shmidt 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds