sh_eth: get R8A7740 Rx descriptor word 0 shift out of #ifdef

The only R8A7740 specific #ifdef hindering  ARM multiplatform build is  left in
sh_eth_rx(): it covers the code shifting Rx buffer descriptor word 0 by 16. Get
rid of the #ifdef by adding 'shift_rd0' field to the  'struct sh_eth_cpu_data',
making the shift dependent on it, and setting it to 1 for the R8A7740 case...

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/renesas/sh_eth.c

@@ -656,6 +656,7 @@ static struct sh_eth_cpu_data r8a7740_data = {
 	.no_ade		= 1,
 	.tsu		= 1,
 	.select_mii	= 1,
+	.shift_rd0	= 1,
 };
 
 static struct sh_eth_cpu_data sh7619_data = {
@@ -1259,16 +1260,15 @@ static int sh_eth_rx(struct net_device *ndev, u32 intr_status, int *quota)
 		if (!(desc_status & RDFEND))
 			ndev->stats.rx_length_errors++;
 
-#if defined(CONFIG_ARCH_R8A7740)
 		/*
 		 * In case of almost all GETHER/ETHERs, the Receive Frame State
 		 * (RFS) bits in the Receive Descriptor 0 are from bit 9 to
 		 * bit 0. However, in case of the R8A7740's GETHER, the RFS
 		 * bits are from bit 25 to bit 16. So, the driver needs right
 		 * shifting by 16.
 		 */
-		desc_status >>= 16;
-#endif
+		if (mdp->cd->shift_rd0)
+			desc_status >>= 16;
 
 		if (desc_status & (RD_RFS1 | RD_RFS2 | RD_RFS3 | RD_RFS4 |
 				   RD_RFS5 | RD_RFS6 | RD_RFS10)) {

drivers/net/ethernet/renesas/sh_eth.h

@@ -481,6 +481,7 @@ struct sh_eth_cpu_data {
 	unsigned no_ade:1;	/* E-DMAC DO NOT have ADE bit in EESR */
 	unsigned hw_crc:1;	/* E-DMAC have CSMR */
 	unsigned select_mii:1;	/* EtherC have RMII_MII (MII select register) */
+	unsigned shift_rd0:1;	/* shift Rx descriptor word 0 right by 16 */
 };
 
 struct sh_eth_private {