mci: imx-esdhc: lower timeout message priority to dev_dbg ...

The timeout when waiting for a command to complete is expected in
some cases, so do not bark loudly. This used to be dev_dbg() earlier
already.

Fixes: 4a7d7b16e2 ("mci: imx-esdhc: Share code for esdhc_send_cmd()")
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mci: imx-esdhc: Share code for esdhc_send_cmd() ...

Versions of esdhc_send_cmd() in imx-esdhc.c and imx-esdhc-pbl.c
implement almost the same algorithm. To avoid code repetition, move
that code to imx-esdhc-common.c and adjust all of the users
accordingly.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mci: imx-esdhc: Introduce esdhc_poll() ...

Replace all of the explcitly coded timeout loops with a shared
subroutine that is used by both regular driver and PBL code.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mci: imx-esdhc: Share code for esdhc_(setup|do)_data operations ...

PBL and PIO case of the regular driver do exaclty the same thing
during esdhc_(setup|do)_data stages of esdhc_send_cmd(). Move the code
to a common file and adjust all of the users accordingly.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mci: imx-esdhc-pbl: Share IO accessors with regular driver ...

With a bit of a change to PBL ESDHC initialization code it is possible
to share all of the low-level I/O accessor code with the regular
driver, including sharing definitions of flags describing HW's quirks.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>