Some SD card connectors do not have separate card detection pin. In that
case card detection has to be done on CD/DAT3 data line. This means
software (i.e. architecture level driver) has to take care of pin
configuration switching (pin has to be set as data pin in case of
transfer and as interrupt card detection pin when there is no action
on data line).
This commit adds CD/DAT3 line card detection support for SAMv7 MCU.
Signed-off-by: Michal Lenc <michallenc@seznam.cz>
The original code hard-coded card detection to the low when card is
inserted and high when not. This might not be true on every board
because it depends on the slot and wiring used. The second reason is
because it is also possible to detect card with D3 pin pull-up when the
slot does not provide dedicated card detection switch.
This introduces new argument to the sam_hsmci_initialize to allow
invert of card detection pin. It also applies this invert to existing
boards as that was the state up to this point.
