[U-Boot] [PATCH v4] arm: kirkwood: See to it that sent data is 8-byte aligned

[Simon Kagstrom]

U-boot might use non-8-byte-aligned addresses for sending data, which
the kwgbe_send doesn't accept (bootp does this for me). This patch
copies the data to be sent to a malloced temporary buffer if it is
non-aligned.

v2: Malloc send buffer
v3: No need to use jumbo frames, use 1518 bytes buffer instead
v4: Correct alignment passed to memalign (should be 8!),
    allocate buffer at initialization(), use PKTSIZE_ALIGN

Signed-off-by: Simon Kagstrom <simon.kagstrom at netinsight.net>
---
 drivers/net/kirkwood_egiga.c |   21 +++++++++++++++++----
 drivers/net/kirkwood_egiga.h |    1 +
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/net/kirkwood_egiga.c b/drivers/net/kirkwood_egiga.c
index 9ac9c1f..008c5dd 100644
--- a/drivers/net/kirkwood_egiga.c
+++ b/drivers/net/kirkwood_egiga.c
@@ -494,18 +494,26 @@ static int kwgbe_send(struct eth_device *dev, volatile void *dataptr,
 	struct kwgbe_device *dkwgbe = to_dkwgbe(dev);
 	struct kwgbe_registers *regs = dkwgbe->regs;
 	struct kwgbe_txdesc *p_txdesc = dkwgbe->p_txdesc;
+	void *p = (void *)dataptr;
 	u32 cmd_sts;
 
+	/* Copy buffer if it's misaligned */
 	if ((u32) dataptr & 0x07) {
-		printf("Err..(%s) xmit dataptr not 64bit aligned\n",
-			__FUNCTION__);
-		return -1;
+		if (datasize > PKTSIZE_ALIGN) {
+			printf("Non-aligned data too large (%d)\n",
+					datasize);
+			return -1;
+		}
+
+		memcpy(dkwgbe->p_aligned_txbuf, p, datasize);
+		p = dkwgbe->p_aligned_txbuf;
 	}
+
 	p_txdesc->cmd_sts = KWGBE_ZERO_PADDING | KWGBE_GEN_CRC;
 	p_txdesc->cmd_sts |= KWGBE_TX_FIRST_DESC | KWGBE_TX_LAST_DESC;
 	p_txdesc->cmd_sts |= KWGBE_BUFFER_OWNED_BY_DMA;
 	p_txdesc->cmd_sts |= KWGBE_TX_EN_INTERRUPT;
-	p_txdesc->buf_ptr = (u8 *) dataptr;
+	p_txdesc->buf_ptr = (u8 *) p;
 	p_txdesc->byte_cnt = datasize;
 
 	/* Apply send command using zeroth RXUQ */
@@ -622,8 +630,13 @@ int kirkwood_egiga_initialize(bd_t * bis)
 							* PKTSIZE_ALIGN + 1)))
 			goto error3;
 
+		if (!(dkwgbe->p_aligned_txbuf = memalign(8, PKTSIZE_ALIGN)))
+			goto error4;
+
 		if (!(dkwgbe->p_txdesc = (struct kwgbe_txdesc *)
 		      memalign(PKTALIGN, sizeof(struct kwgbe_txdesc) + 1))) {
+			free(dkwgbe->p_aligned_txbuf);
+		      error4:
 			free(dkwgbe->p_rxbuf);
 		      error3:
 			free(dkwgbe->p_rxdesc);
diff --git a/drivers/net/kirkwood_egiga.h b/drivers/net/kirkwood_egiga.h
index 9c893d1..16d5214 100644
--- a/drivers/net/kirkwood_egiga.h
+++ b/drivers/net/kirkwood_egiga.h
@@ -499,6 +499,7 @@ struct kwgbe_device {
 	struct kwgbe_rxdesc *p_rxdesc;
 	struct kwgbe_rxdesc *p_rxdesc_curr;
 	u8 *p_rxbuf;
+	u8 *p_aligned_txbuf;
 };
 
 #endif /* __EGIGA_H__ */
-- 
1.6.0.4