Some controllers have been designed on the assumption that all transfers
will be 32-bit aligned, both in start address and in size. This is not a
guarantee the SDHCI specification provides and not one we can provide.

Revert back to PIO for individual requests in order to work around the
hardware bug.
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

We support 2.0 controllers, even though we don't use anything in the new
feature set.
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

Add a comment for each quirk to describe what it does and why.
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

Given the patch which simplifies the spi_sync calling convention, this one
updates the callers of that routine which tried using it according to the
previous specification.  (Most didn't.)
Signed-off-by: NMarc Pignat <marc.pignat@hevs.ch>
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

It is possible to handle arbitrary block sizes with tifm card reader by
conditionally switching to PIO in case such block has to be delivered. At
the beginning of each request, DMA is either disabled (non-power-of-2 block
size) or set to load time user preference.
Signed-off-by: NAlex Dubov <oakad@yahoo.com>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

Signed-off-by: NRolf Eike Beer <eike-kernel@sf-tec.de>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

Fix:

WARNING: at arch/arm/mach-pxa/clock.c:69 clk_disable()
[<c002d7c8>] (dump_stack+0x0/0x14) from [<c00334f4>] (clk_disable+0x34/0xa0)
[<c00334c0>] (clk_disable+0x0/0xa0) from [<c028a43c>] (pxamci_set_ios+0x74/0xf0)
[<c028a3c8>] (pxamci_set_ios+0x0/0xf0) from [<c0281548>] (mmc_power_off+0x90/0x9c)
[<c02814b8>] (mmc_power_off+0x0/0x9c) from [<c0281a30>] (mmc_start_host+0x18/0x28)
[<c0281a18>] (mmc_start_host+0x0/0x28) from [<c02825a0>] (mmc_add_host+0xe8/0x104)
[<c02824b8>] (mmc_add_host+0x0/0x104) from [<c028a7d0>] (pxamci_probe+0x24c/0x2f4)
[<c028a584>] (pxamci_probe+0x0/0x2f4) from [<c01e5948>] (platform_drv_probe+0x20/0x24)
...
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

The previous change omits "data->" prefix
in the "data->sg" case. This change fixes kernel
compilation.
Signed-off-by: NPavel Pisa <pisa@cmp.felk.cvut.cz>

 drivers/mmc/host/imxmmc.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
Signed-off-by: NJens Axboe <axboe@carl.home.kernel.dk>

 #include <scatterlist/scatterlist.h>
is an odd thing to do...
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Patch 49dce689 changed the sysfs data
structures for SPI in a way which broke the MMC-over-SPI host driver.

This patch fixes that regression by changing the scheme used to keep
from knowingly trying to use a shared bus segment, and updates the
adjacent comments slightly to better explain the issue.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

The flags parameter got removed in a previous commit, but some
references were overlooked.
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

Do a full scan of the directory to try and be a bit more proactive,
instead of waiting for things to break.
Signed-off-by: NJens Axboe <jens.axboe@oracle.com>

Commits

  58b053e4 ("Update arch/ to use sg helpers")
  45711f1a ("[SG] Update drivers to use sg helpers")
  fa05f128 ("Update net/ to use sg helpers")

converted many files to use the scatter gather helpers without ensuring
that the necessary headerfile <linux/scatterlist> is included.  This
happened to work for ia64, powerpc, sparc64 and x86 because they
happened to drag in that file via their <asm/dma-mapping.h>.

On most of the others this probably broke.

Instead of increasing the header file spider web I choose to include
<linux/scatterlist.h> directly into the affectes files.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Signed-off-by: NEmil Medve <Emilian.Medve@Freescale.com>
Signed-off-by: NJens Axboe <jens.axboe@oracle.com>

Signed-off-by: NJens Axboe <jens.axboe@oracle.com>

A small MMC driver cleanup.

Use the defined AT91_MCI_ERRORS in at91_mci_completed_command() instead
of specifying all the error bits individually.
Signed-off-by: NAndrew Victor <andrew@sanpeople.com>
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

AFAICS, fallout from repacing include of blkdev.h with include of bio.h.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Make the SPI framework and drivers stop using class_device.  Update docs
accordingly ...  highlighting just which sysfs paths should be
"safe"/stable.
Signed-off-by: NTony Jones <tonyj@suse.de>
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Make sure the mmc_spi driver can build without CONFIG_BLOCK.
Issue noted by "Avuton Olrich" <avuton@gmail.com> and randconfig.

While that won't be a common configuration, sometimes embedded
boards use SDIO to interface WLAN or Bluetooth chips (vs some
parallel interface), and don't provide an MMC/SD socket for use
with flash memory cards.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Using weight32() to determine if a value is a power of 2 is a rather
heavi weight solution.  The classic idiom is (x & (x - 1)) == 0, but
the kernel already provide a is_power_of_2 function for it.
Signed-off-by: NNicolas Pitre <nico@cam.org>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

The PXA has two transmit FIFOes, each32 byte deep.  when one FIFO is
full and the other one has been transmitted, they are automatically
swapped and DMA is triggered for another 32 byte burst.  However, when
there is less than 32 bytes left to send, the FIFO swap has to be done
manually. This is required for some SDIO transfers which are not
required to be multiples of 32 bytes.

A DMA completion interrupt is set for each descriptor which length isn't
a multiple of 32 in order to force the FIFO swap.  While at it, the DMA
interrupt handler has been made a bit more resilient against errors.
Signed-off-by: NNicolas Pitre <nico@marvell.com>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

The forcedma and nodma module parameters can be replaced with the quirks
parameter, so remove the redundancy.
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

Some controllers like ENE712 can't work properly with DMA mode,
add this quirk to force these kinds of HW work with PIO mode
Signed-off-by: NFeng Tang <feng.tang@intel.com>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

Many host controllers don't fully follow the PCI spec to claim
whether they support DMA in PCI class register. Leave the driver
to judge it from the Capability register, quirks and module parameter
Signed-off-by: NFeng Tang <feng.tang@intel.com>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

Signed-off-by: NNicolas Pitre <nico@cam.org>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

Thanks to Matt Domsch and Rezwanul Kabir at Dell, we know how to disable the
MMC controller on the multi-function Ricoh R5C832. The MMC controller needs
to be disabled or it will steal MMC cards from the SD controller where they
would otherwise be supported by the Linux SDHCI driver.
Signed-off-by: NPhilipl Langdale <philipl@overt.org>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

Again, only available from PXA27x.
Signed-off-by: NBridge Wu <mingqiao.wu@gmail.com>
Signed-off-by: NNicolas Pitre <nico@marvell.com>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

From PXA27x, it is possible to do 4-bit data transfers.
Signed-off-by: NBridge Wu <mingqiao.wu@gmail.com>
Signed-off-by: NNicolas Pitre <nico@marvell.com>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

From PXA27x, it is possible to do 2048-byte block transfers.
Signed-off-by: NNicolas Pitre <nico@marvell.com>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

Pending interrupts should be determined from both I_REG and I_MASK
registers.
Signed-off-by: NBridge Wu <mingqiao.wu@gmail.com>
Signed-off-by: NNicolas Pitre <nico@marvell.com>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

The patch enables to define MMC host get_ro() method through platform data.
Signed-off-by: NPavel Pisa <pisa@cmp.felk.cvut.cz>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

This is the latest version of the MMC-over-SPI support.  It works
on 2.6.23-rc2 plus git-mmc (from rc1-mm2), along with the preceding
patches which teach the rest of the MMC stack about SPI.

The main issue of note is that sometimes cards need to be power cycled
to recover after certain faults.  Also, it may sometimes be necessary
to disable CRCs.  ("modprobe mmc_core use_spi_crc=n")
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Cc: mikael.starvik@axis.com,
Cc: Hans-Peter Nilsson <hp@axis.com>
Cc: Jan Nikitenko <jan.nikitenko@gmail.com>
Cc: Mike Lavender <mike@steroidmicros.com>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

Add support for relaying the sdio interrupt signal from the card.
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

This kind of transfer is not supported, so don't advertise it and make it
fail early.
Signed-off-by: NMarc Pignat <marc.pignat@hevs.ch>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

The MMC_DATA_MULTI flag never had a proper definition of what it
means, so remove it and let the drivers check the block count in
the request.
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

Remove the BYTEBLOCK capability and let the broken hosts fail the
requests with -EINVAL instead.
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

Convert the MMC layer to use standard error codes and not its own,
incompatible values.
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

This patch fixes a bug in AT91 mmc host driver, that enables the wakeup
from suspend on card detection pin even if the card detect pin is not
available (==0). If not card detection pin is defined, IRQ0 == FIQ gets
enabled and if some activity is present on that pin, the system gets a
FIQ request, that causes a crash.
Signed-off-by: NAnti Sullin <anti.sullin@artecdesign.ee>
Signed-off-by: NNicolas Ferre <nicolas.ferre@rfo.atmel.com>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

When we get unexpected interrupts, also print which interrupt it was.
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>