switch all platform_bus device/driver registering to platform_driver/device_register ...

now register_driver and register_device are for bus only usage.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

mci: pxamci poweron ramp delay ...

As per MMC spec, once power has been applied to an SD card, the card
can take as much as 250ms to complete its power-up cycle, and become
responsive to CMD0.

When this delay was not in place, activating the SD card in the env
init failed sometimes. With it, no more failure are observed.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mci: pxamci fix R1b responses ...

The pxamci driver was not waiting for the BUSY line to be
deasserted. This was specifically breaking the CMD12 at
the end of block multiple writes, when the SD card had not
time enough to commit the last write.

Fix it by waiting for PRG_DONE bit (which is actually the
busy signal end condition).

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mci: pxamci fix CMD12 handling ...

The pxamci requires a bit to be set in the command control
register when a CMD12 is sent. Set it, as required in the
PXA Developer Manuel, chapter "Stop Data Transmission
Command (CMD12 or IO/Abort with CMD52)".

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mci: pxamci fix response type ...

When preparing a command, apply a mask so that only the command part
will be used for the switch case. This will be more robust
for future command response types.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mci: pxamci change clocks handling ...

Fix clock handling accordingly to PXA manual :
 - enable the MMC controller clock once and for all
 - only disable the MMC bus clock when changing the MMCLK by
 adjusting the clock ratio, else let the controller and SD
 card shut down the clock as the see fit.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mci: pxamci define timeouts ...

Instead of using hard encoded values in the code, use defines to setup
the timeouts of reads/writes/commands.
Fix the read timeout as defined in the PXA Developer Manual.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mci: remove unused device argument from set_ios ...

This argmuent is unused in all drivers, so remove it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mci core: replace discrete ios values with struct ios ...

As we'll need more arguments to set_ios over time put them
in a struct mci_ios like the kernel does.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers/mci: pxa fix clockrate ...

The clock rate was incorrectly calculated, leading to a
frequency of 19.5MHz / 64 instead of 19.5Mz for the host
controller.

with the fix applied, a copy of a file of 230 kB shrinks
from 6000ms to 123ms.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers/mci: pxa read data performance boost ...

Increase pxa reading performance by reading 4 bytes at a
time instead of 4 reads of 1 byte.
As the mci controller FIFO accepts reads on bytes, halfwords
or words, use words whenether possible.

The boost is for a 250KBytes file read and display (bmp):
 - before: 6900ms
 - after: 6000ms

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers/mci: pxa writedata timeout ...

The write data timeout is too small for old cards,
especially the Transcend 256MBytes SD card. Increase it from
10ms to 100ms.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers/mci: add PXA host controller ...

Add a simple PIO based host controller for MMC and SD cards
on PXA SoCs. Reads and writes are available, and no usage is
made of DMA or IRQs.
SPI mode is not supported yet.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>