[U-Boot] [PATCH v2 1/2] net: fec_mxc: Adjust RX DMA alignment for mx6solox

[Fabio Estevam <festevam@gmail.com>]

From: Fabio Estevam <fabio.estevam@freescale.com>

mx6solox has a requirement for 64 bytes alignment for RX DMA transfer.

Adjust it accordingly.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
---
Changes since v1:
- Avoid too many ifdef's by providing a dma_rx_align() funtion as suggested
by Otavio

 drivers/net/fec_mxc.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
index 4cefda4..1a5105e 100644
--- a/drivers/net/fec_mxc.c
+++ b/drivers/net/fec_mxc.c
@@ -28,6 +28,8 @@ DECLARE_GLOBAL_DATA_PTR;
  */
 #define FEC_XFER_TIMEOUT	5000
 
+#define ARCH_DMA_MINALIGN_MX6SX	64
+
 #ifndef CONFIG_MII
 #error "CONFIG_MII has to be defined!"
 #endif
@@ -267,6 +269,15 @@ static int fec_tx_task_disable(struct fec_priv *fec)
 	return 0;
 }
 
+static int dma_rx_align(void)
+{
+#ifdef CONFIG_MX6SX
+	return	ARCH_DMA_MINALIGN_MX6SX;
+#else
+	return ARCH_DMA_MINALIGN;
+#endif
+}
+
 /**
  * Initialize receive task's buffer descriptors
  * @param[in] fec all we know about the device yet
@@ -286,7 +297,7 @@ static void fec_rbd_init(struct fec_priv *fec, int count, int dsize)
 	 * Reload the RX descriptors with default values and wipe
 	 * the RX buffers.
 	 */
-	size = roundup(dsize, ARCH_DMA_MINALIGN);
+	size = roundup(dsize, dma_rx_align());
 	for (i = 0; i < count; i++) {
 		data = (uint8_t *)fec->rbd_base[i].data_pointer;
 		memset(data, 0, dsize);
@@ -881,9 +892,9 @@ static int fec_alloc_descs(struct fec_priv *fec)
 	/* Allocate RX buffers. */
 
 	/* Maximum RX buffer size. */
-	size = roundup(FEC_MAX_PKT_SIZE, ARCH_DMA_MINALIGN);
+	size = roundup(FEC_MAX_PKT_SIZE, dma_rx_align());
 	for (i = 0; i < FEC_RBD_NUM; i++) {
-		data = memalign(ARCH_DMA_MINALIGN, size);
+		data = memalign(dma_rx_align(), size);
 		if (!data) {
 			printf("%s: error allocating rxbuf %d\n", __func__, i);
 			goto err_ring;
-- 
1.9.1