net: w5100: move mmiowb into register access callbacks
Instead of sprinkle mmiowb over the driver code, move it into primary register write callbacks. (w5100_write, w5100_write16, w5100_writebuf) This is a preparation for supporting SPI interface which doesn't use MMIO for accessing w5100 registers. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: Mike Sinkovsky <msink@permonline.ru> Cc: David S. Miller <davem@davemloft.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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