Adding support for runtime power-management to the MMCIF driver allows
it to save power as long as no card is present. To also allow to turn
off the power domain at that time, we release DMA channels during that
time, since on some sh-mobile systems the DMA controller(s) and the
MMCIF block belong to the same power domain. System-wide power
management has been tested with experimental PM patches on AP4-based
systems.
Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: NChris Ball <cjb@laptop.org>

The MMC subsystem does not guarantee that host driver .request() and
.set_ios() callbacks are serialised. Such concurrent calls, however,
do not have to be meaningfully supported, drivers just have to make
sure to avoid any severe problems.
Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Simon Horman <horms@verge.net.au>
Cc: Magnus Damm <damm@opensource.se>
Signed-off-by: NChris Ball <cjb@laptop.org>

To support MMC aggressive clock gating the driver has to stop the
interface clock when the .set_ios() method is called with .clock == 0.
Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: NChris Ball <cjb@laptop.org>

Use the new dmaengine helper functions, and drop the error check
on the returned cookier from the dmaengine - we recently
established that this is really not allowed to fail.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

The host_sglen is now actually used to keep track of whether DMA
is active or not, so rename and retype it to bool.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

According to the DMA-API you shall unmap the sglists with the same
sglist length as passed into the mapping function, not the
returned value from the mapping function.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

As established for the MMCI, it is proper to map the DMA buffers
on the DMA engine which is the one actually performing the DMA.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

Simplify the driver by removing the possibility to build it without the DMA
support and remove the respective Kconfig parameter.
Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: NMagnus Damm <damm@opensource.se>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

The MMCIF controller on sh-mobile platforms can use the DMA controller for data
transfers. Interface to the SH dmaengine driver to enable DMA. We also have to
lower the maximum number of segments to match with the number od DMA
descriptors on SuperH, this doesn't significantly affect driver's PIO
performance.
Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Replace pr_* with respective dev_*, sort headers alphabetically, remove an
unused struct member, superfluous variable initialisations and type-casts.
Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

In sh_mmcif.c an event is used as a completion, switch over. When a
wait_for_completion*_timeout() returns, it suffices to check the remaining
time, setting an additional flag before waking up the waiting task only reduces
the race window, but does not eliminate it. This patch switches the driver to
use a completion to signal an interrupt, the only case, when an interrupt
should not wake up the waiter, is when an automatic CMD12 completes. Also fix
MODULE_ALIAS.
Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This moves some constants from sh_mmcif.c to sh_mmcif.h
so that they can be used in sh_mmcif_boot_init().

It also alters the definition of SOFT_RST_OFF from (0 << 31) to
~SOFT_RST_ON (= ~(1 << 31)). The former seems bogus.  The latter is
consistent with the code in sh_mmcif_boot_init().

Cc: Yusuke Goda <yusuke.goda.sx@renesas.com>
Cc: Magnus Damm <magnus.damm@gmail.com>
Signed-off-by: NSimon Horman <horms@verge.net.au>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

In some platforms (e.g. AP4EVB) the card detect pin of a slot is not
directly connected to the sh_mmcif controller, so that polling needs
to be used. To overcome the overhead induced by querying the controller
on each poll cycle, card detection can be handled in the platform code
more efficiently.
This patch exposes a get_cd hook for that purpose.
Signed-off-by: NArnd Hannemann <arnd@arndnet.de>
Tested-by: NYusuke Goda <yusuke.goda.sx@renesas.com>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

We have deprecated the distinction between hardware and physical
segments in the block layer.  Consolidate the two limits into one in
drivers/mmc/.
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

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: NMagnus Damm <damm@opensource.se>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

MMCIF is the MMC Host Interface in SuperH.
Signed-off-by: NYusuke Goda <yusuke.goda.sx@renesas.com>
Cc: Ben Hutchings <ben@decadent.org.uk>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>