mmc: add missing printk levels

Some printk:s were missing an explicit level.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

mmc: be more verbose about card insertions/removal

Let the user know that the kernel actually detected the card
by printing some basic information in dmesg.

Signed-off-by: Pierr

mmc: be more verbose about card insertions/removal

Let the user know that the kernel actually detected the card
by printing some basic information in dmesg.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

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mmc: Don't hold lock when releasing an added card

When the card has been added to the device model, it might be bound
to a card driver. Therefore, we have to release the host lock when

mmc: Don't hold lock when releasing an added card

When the card has been added to the device model, it might be bound
to a card driver. Therefore, we have to release the host lock when
trying to remove it as we otherwise might deadlock with the driver.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

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mmc: update header file paths

Make sure all headers in the files reflect their true position
in the tree.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

mmc: fix silly copy-and-paste error

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

mmc: refactor bus operations

Move bus operations to its own file for the sake of clarity. Also
delegate sysfs attributes to bus handlers in preparation for other
more exotic types.

mmc: refactor bus operations

Move bus operations to its own file for the sake of clarity. Also
delegate sysfs attributes to bus handlers in preparation for other
more exotic types.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

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mmc: remove old card states

Remove card states that no longer make any sense.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

mmc: support unsafe resume of cards

Since many have the system root on MMC/SD we must allow some foot
shooting when it comes to resume.

We cannot detect if a card is removed and

mmc: support unsafe resume of cards

Since many have the system root on MMC/SD we must allow some foot
shooting when it comes to resume.

We cannot detect if a card is removed and reinserted during suspend,
so the safe approach would be to assume it was, avoiding potential
filesystem corruption. This will of course not work if you cannot
release the card before suspend.

This commit adds a compile time option that makes the MMC layer
assume the card wasn't touched if it is redetected upon resume.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

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mmc: separate out reading EXT_CSD

Separate the reading and decoding of the EXT_CSD register with the
actions taken on it.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

MMC: Fix handling of low-voltage cards

Fix handling of low voltage MMC cards.

The latest MMC and SD specs both agree that support for
low-voltage operations is indicated by bit

MMC: Fix handling of low-voltage cards

Fix handling of low voltage MMC cards.

The latest MMC and SD specs both agree that support for
low-voltage operations is indicated by bit 7 in the OCR.
The MMC spec states that the low voltage range is
1.65-1.95V while the SD spec leaves the actual voltage
range undefined - meaning that there is still no such
thing as a low voltage SD card.

However, an old Sandisk spec implied that bits 7.0
represented voltages below 2.0V in 1V or 0.5V increments,
and the code was accordingly written with that expectation.

This confusion meant that host drivers attempting to support
the typical low voltage (1.8V) would set the wrong bits in
the host OCR mask (usually bits 5 and/or 6) resulting in the
the low voltage mode never being used.

This change corrects the low voltage range and adds sanity
checks on the reserved bits (0-6) and for SD cards that
claim to support low-voltage operations.

Signed-off-by: Philip Langdale <philipl@overt.org>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

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mmc: add bus handler

Delegate protocol handling to "bus handlers". This allows the core to
just handle the task of arbitrating the bus. Initialisation and
pampering of cards is now d

mmc: add bus handler

Delegate protocol handling to "bus handlers". This allows the core to
just handle the task of arbitrating the bus. Initialisation and
pampering of cards is now done by the different bus handlers.

This design also allows MMC and SD (and later SDIO) to be more cleanly
separated, allowing easier maintenance.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

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