fec: use dma_alloc_coherent for descriptor ring

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

1 files changed, 9 insertions, 5 deletions

diff --git a/drivers/net/fec.c b/drivers/net/fec.c
index 1087c4da84a5..46a441a9c644 100644
--- a/drivers/net/fec.c
+++ b/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;