net: smc911x: Add pkt_data_pull and pkt_data_push function

The RSK7203 board has the SMSC9118 wired up 'incorrectly'.
Byte-swapping is necessary, and so poor performance is inevitable.
This problem cannot evade by the swap function of CHIP, this can
evade by software Byte-swapping.
And this has problem by FIFO access only. pkt_data_pull/pkt_data_push
functions necessary to solve this problem.
Signed-off-by: NNobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
Signed-off-by: NBen Warren <biggerbadderben@gmail.com>

drivers/net/smc911x.c

@@ -57,6 +57,11 @@ static inline void reg_write(u32 addr, u32 val)
 #error "SMC911X: undefined bus width"
 #endif /* CONFIG_DRIVER_SMC911X_16_BIT */
 
+u32 pkt_data_pull(u32 addr) \
+	__attribute__ ((weak, alias ("reg_read")));
+void pkt_data_push(u32 addr, u32 val) \
+	__attribute__ ((weak, alias ("reg_write")));
+
 #define mdelay(n)       udelay((n)*1000)
 
 /* Below are the register offsets and bit definitions
@@ -641,7 +646,7 @@ int eth_send(volatile void *packet, int length)
 	tmplen = (length + 3) / 4;
 
 	while (tmplen--)
-		reg_write(TX_DATA_FIFO, *data++);
+		pkt_data_push(TX_DATA_FIFO, *data++);
 
 	/* wait for transmission */
 	while (!((reg_read(TX_FIFO_INF) & TX_FIFO_INF_TSUSED) >> 16));
@@ -684,7 +689,7 @@ int eth_rx(void)
 
 		tmplen = (pktlen + 2+ 3) / 4;
 		while (tmplen--)
-			*data++ = reg_read(RX_DATA_FIFO);
+			*data++ = pkt_data_pull(RX_DATA_FIFO);
 
 		if (status & RX_STS_ES)
 			printf(DRIVERNAME