linux-toradex.git/include/linux/mmc/mmc.h, branch v3.1.2

mmc: block: allow get_card_status() to return error status

2011-07-20T21:20:54+00:00

If the MMC_SEND_STATUS command is not successful, we should not return
a zero status word, but instead allow the caller to know positively
that an error occurred.

Convert the open-coded get_card_status() to use the helper function,
and provide definitions for the card state field.

Signed-off-by: Russell King 
Acked-by: Linus Walleij 
Tested-by: Pawel Moll 
Signed-off-by: Chris Ball

mmc: Standardize header file inclusion checks.

2011-07-20T21:20:48+00:00

Standardize the checks for multiple MMC header file inclusion,
including adding comments to terminating #endif's, and fixing
one incorrect comment.

Signed-off-by: Robert P. J. Day 
Signed-off-by: Chris Ball

mmc: core: Use CMD23 for multiblock transfers when we can.

2011-05-25T20:48:46+00:00

CMD23-prefixed instead of open-ended multiblock transfers
have a performance advantage on some MMC cards.

Signed-off-by: Andrei Warkentin 
Signed-off-by: Chris Ball

mmc: sd: add support for tuning during uhs initialization

2011-05-25T03:53:46+00:00

Host Controller needs tuning during initialization to operate SDR50
and SDR104 UHS-I cards. Whether SDR50 mode actually needs tuning is
indicated by bit 45 of the Host Controller Capabilities register.
A new command CMD19 has been defined in the Physical Layer spec
v3.01 to request the card to send tuning pattern.

We enable Buffer Read Ready interrupt at the very begining of tuning
procedure, because that is the only interrupt generated by the Host
Controller during tuning. We program the block size to 64 in the
Block Size register. We make sure that DMA Enable and Multi Block
Select in the Transfer Mode register are set to 0 before actually
sending CMD19. The tuning block is sent by the card to the Host
Controller using DAT lines, so we set Data Present Select (bit 5) in
the Command register. The Host Controller is responsible for doing
the verfication of tuning block sent by the card at the hardware
level. After sending CMD19, we wait for Buffer Read Ready interrupt.
In case we don't receive an interrupt after the specified timeout
value, we fall back on fixed sampling clock by setting Execute
Tuning (bit 6) and Sampling Clock Select (bit 7) of Host Control2
register to 0. Before exiting the tuning procedure, we disable Buffer
Read Ready interrupt and re-enable other interrupts.

Tested by Zhangfei Gao with a Toshiba uhs card and general hs card,
on mmp2 in SDMA mode.

Signed-off-by: Arindam Nath 
Reviewed-by: Philip Rakity 
Tested-by: Philip Rakity 
Acked-by: Zhangfei Gao 
Signed-off-by: Chris Ball

mmc: MMC boot partitions support.

2011-05-25T01:01:21+00:00

Allows device MMC boot partitions to be accessed. MMC partitions are
treated effectively as separate block devices on the same MMC card.

Signed-off-by: Andrei Warkentin 
Acked-by: Arnd Bergmann 
Signed-off-by: Chris Ball

mmc: Reliable write support.

2011-05-25T00:59:38+00:00

Allows reliable writes to be used for MMC writes. Reliable writes are used
to service write REQ_FUA/REQ_META requests. Handles both the legacy and
the enhanced reliable write support in MMC cards.

Signed-off-by: Andrei Warkentin 
Reviewed-by: Arnd Bergmann 
Signed-off-by: Chris Ball

mmc: Ensure linux starts in eMMC user partition

2011-05-25T00:59:13+00:00

uBoot sometimes leaves eMMC pointing to the private boot partition.
Ensure we always start looking at the user partition.

Signed-off-by: Philip Rakity 
Signed-off-by: Bruce Clemens 
Signed-off-by: Mark F. Brown 
Signed-off-by: Chris Ball

mmc: export eMMC4.4 enhanced area details to sysfs

2011-03-15T17:48:01+00:00

Enhanced area feature is a new feature defined in eMMC4.4 standard. This
user data area provides higher performance/reliability, at the expense
of using twice the effective media space due to the area using SLC.

The MMC driver now reads out the enhanced area offset and size and adds
them to the device attributes in sysfs. Enabling the enhanced area can
only be done once, and should be done in manufacturing. To use this
feature, bit ERASE_GRP_DEF should also be set.

Documentation/ABI/testing/sysfs-devices-mmc describes the two new
attributes.

Signed-off-by: Chuanxiao Dong 
Reviewed-by: Chris Ball 
Signed-off-by: Chris Ball

mmc: Test bus-width for old MMC devices

2011-01-09T04:52:09+00:00

Some old MMC devices fail with the 4/8 bits the driver tries to use
exclusively.  This patch adds a test for the given bus setup and falls
back to the lower bit mode (until 1-bit mode) when the test fails.

[Major rework and refactoring by tiwai]
[Quirk addition and many fixes by prakity]

Signed-off-by: Aries Lee 
Signed-off-by: Takashi Iwai 
Signed-off-by: Philip Rakity 
Tested-by: Philip Rakity 
Signed-off-by: Chris Ball

mmc: MMC 4.4 DDR support

2010-10-23T13:11:16+00:00

Add support for Dual Data Rate MMC cards as defined in the 4.4
specification.

Signed-off-by: Hanumath Prasad 
Cc: linux-mmc@vger.kernel.org
Acked-by: Linus Walleij 
Tested-by Zhangfei Gao 
Signed-off-by: Chris Ball