fec: use dma_alloc_coherent for descriptor ring

Signed-off-by: NSascha Hauer <s.hauer@pengutronix.de>
Acked-by: NGreg Ungerer <gerg@uclinux.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/fec.c

@@ -186,6 +186,7 @@ struct fec_enet_private {
 
 	/* CPM dual port RAM relative addresses.
 	*/
+	dma_addr_t	bd_dma;
 	cbd_t	*rx_bd_base;		/* Address of Rx and Tx buffers. */
 	cbd_t	*tx_bd_base;
 	cbd_t	*cur_rx, *cur_tx;		/* The next free ring entry */
@@ -2107,7 +2108,8 @@ int __init fec_enet_init(struct net_device *dev)
 
 	/* Allocate memory for buffer descriptors.
 	*/
-	mem_addr = __get_free_page(GFP_KERNEL);
+	mem_addr = (unsigned long)dma_alloc_coherent(NULL, PAGE_SIZE,
+			&fep->bd_dma, GFP_KERNEL);
 	if (mem_addr == 0) {
 		printk("FEC: allocate descriptor memory failed?\n");
 		return -ENOMEM;
@@ -2202,8 +2204,9 @@ int __init fec_enet_init(struct net_device *dev)
 
 	/* Set receive and transmit descriptor base.
 	*/
-	fecp->fec_r_des_start = __pa((uint)(fep->rx_bd_base));
-	fecp->fec_x_des_start = __pa((uint)(fep->tx_bd_base));
+	fecp->fec_r_des_start = fep->bd_dma;
+	fecp->fec_x_des_start = (unsigned long)fep->bd_dma + sizeof(cbd_t)
+				* RX_RING_SIZE;
 
 	/* Install our interrupt handlers. This varies depending on
 	 * the architecture.
@@ -2291,8 +2294,9 @@ fec_restart(struct net_device *dev, int duplex)
 
 	/* Set receive and transmit descriptor base.
 	*/
-	fecp->fec_r_des_start = __pa((uint)(fep->rx_bd_base));
-	fecp->fec_x_des_start = __pa((uint)(fep->tx_bd_base));
+	fecp->fec_r_des_start = fep->bd_dma;
+	fecp->fec_x_des_start = (unsigned long)fep->bd_dma + sizeof(cbd_t)
+				* RX_RING_SIZE;
 
 	fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
 	fep->cur_rx = fep->rx_bd_base;