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>

Separate the reading and decoding of the EXT_CSD register with the
actions taken on it.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Break apart the SD switch function into one that reads the capabilities
and one that acts on them.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

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>

Consolidate the list of available voltages.

Up until now, a separate set of defines has been
used for host->vdd than that used for the OCR
voltage mask values. Having two sets of defines
allows them to get out of sync and the current
sets are already inconsistent with one claiming
to describe ranges and the other specific voltages.

Only the SDHCI driver uses the host->vdd defines and
it is easily fixed to use the OCR defines.
Signed-off-by: Philip Langdale <philipl@overt.org>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

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>

Move the check for supported data opcodes to the beginning of the
request function to avoid wedging the card.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Move protocol operations and definitions into their own files
in an effort to separate protocol handling and bus
arbitration more clearly.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Create a "core" subdirectory to house the central bus handling
functions.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

The classic MMC bus was defined as multi card bus
system, which is reflected in the design in the MMC
layer.

When SD showed up, the bus topology was abandoned
and a star topology (one card per host) was mandated.
MMC version 4 has followed this, officially deprecating
the bus topology.

As we do not have any known users of the bus
topology we can remove support for it. This will
simplify the code and rectify some incorrect
assumptions in the newer additions.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Suspending MMC/SD cards (versus removing and readding them) is an
inherently unsafe operation and has even been broken for some time.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Make sure we don't deadlock when removing a suspended block
queue, something that might happen if the card is removed during
suspend.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Make sure we kill of any pending detection runs when the host
is removed instead of when it is freed. Also add some debugging
to make sure the driver doesn't queue up more detection after it
has removed the host.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Clean up the drivers/mmc directory by moving card and host drivers
into subdirectories.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

The mmc block queue functions are tailored for the mmc_block
driver, so move those functions into that module.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

The "present" state indicates that the card is a registered device, so
it is more clear to put it together with the actual registration.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

All host drivers were #include:ing mmc/protocol.h just to
get access to the OCR bit defines. Move these to host.h instead.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Split out the type of card into its own field as it hardly
qualifies as a state.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Support for MMC 4.2 sector based cards. This tweaks the init a
bit and reads a new field out of the EXT_CSD.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Fix copy-n-paste error.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

sparc64:

drivers/misc/tifm_7xx1.c: In function `tifm_7xx1_probe':
drivers/misc/tifm_7xx1.c:294: error: `DMA_32BIT_MASK' undeclared
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Cosmetic changes to the code.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

It was found that delays associated with issue and completion of the commands
severely limit performance of the new, fast SD cards. To alleviate this issue
scatter-gather emulation in software is implemented for both dma and pio
transfer modes. Non-block aligned and high memory sg entries are accounted
for.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Resume should not explicitly check for media type. Instead, it may relay
on success of socket initialization.
Small changes are introduced to tifm_sd_initialize to make it more robust.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

State machine used to to track mmc command state was found to be fragile
and unreliable, making many cards unusable. The safer solution is to perform
all needed checks at every card event.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

To allow for switching of trasfer mode (dma/pio) on a per-request basis,
pio and dma request issue and completion function are now merged.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

host->flags variable was hosting a collection of bits with different
semantics. For clarity, hardware bit masks are now defined as macros,
socket flags represented as bit fields and flags (now cmd_flags) only
hosts command processing modifiers.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

This wait was needed because of the mmc layer failure to wait for completion
of all outstanding commands before host removal. It should be fixed now in
the mmc layer.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

tifm_sd_terminate can only lawfully be called on device removal so it can be
merged with tifm_sd_remove.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

A sysfs attribute reflecting current media type is added.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Fixes to the adapter resume function to correctly handle all possible cases:
1. Card is removed during suspend
2. Card is inserted during suspend into previously empty socket
3. Card is replaced during suspend by same or different media type card.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Some details of the device management (create, add, remove) are really
belong to the tifm_core, as they are not hardware specific.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Some details of the adapter management (create, add, remove) are really
belong to the tifm_core, as they are not hardware specific.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Remove unneeded conditions and change a sleeping regime a little in the
card type detection routine.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Freezeable workqueue makes sure that adapter work items (device insertions
and removals) would be handled after the system is fully resumed. Previously
this was achieved by explicit freezing of the kthread.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Remove code duplicating the kernel functionality and clean up data
structures involved in driver matching.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Instead of passing transformed value of adapter interrupt status to
socket drivers, implement two separate callbacks - one for card events
and another for dma events.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Block completion interrupts occur faster than we can process
them, so just ignore them competely.

Commit also fixes up some incorrect register defines.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

Now that we've fixed our only offender when it comes to strange sg
list, add a check so that future users keep the sg list proper with
regard to transfer size.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>