Implement different ways of selecting driving capability(a necessary adjustment
along with voltage change). It was origionally in device-independent
mmc/host/rtsx_pci_sdmmc.c. Moving it here to support devices which may have a
different way of adjustment.
Signed-off-by: NRoger Tseng <rogerable@realtek.com>
Reviewed-by: NWei WANG <wei_wang@realsil.com.cn>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

Add callback function conv_clk_and_div_n to convert between SSC clock
and its divider N.
For rtl8411, the formula to calculate SSC clock divider N is different
with the other card reader models.
Signed-off-by: NWei WANG <wei_wang@realsil.com.cn>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

Different card reader has different method to switch output voltage,
add this callback to let the card reader implement its individual switch
function.
This is needed as rtl8411 has a specific switch output voltage procedure.
Signed-off-by: NWei WANG <wei_wang@realsil.com.cn>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

Realtek PCI-E card reader driver adapts requests from upper-level
sdmmc/memstick layer to the real physical card reader.
Signed-off-by: NWei WANG <wei_wang@realsil.com.cn>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Tested-by: NBorislav Petkov <bp@alien8.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Realtek PCI-E card reader driver adapts requests from upper-level
sdmmc/memstick layer to the real physical card reader.
Signed-off-by: NWei WANG <wei_wang@realsil.com.cn>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Tested-by: NBorislav Petkov <bp@alien8.de>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>