- *((unsigned short *)(current_tx_ptr->packet)) =
- (unsigned short)(skb->len);
- memcpy((char *)(current_tx_ptr->packet + 2), skb->data,
- (skb->len));
- current_tx_ptr->desc_a.start_addr =
- (unsigned long)current_tx_ptr->packet;
- if (current_tx_ptr->status.status_word != 0)
- current_tx_ptr->status.status_word = 0;
- blackfin_dcache_flush_range((unsigned int)current_tx_ptr->
- packet,
- (unsigned int)(current_tx_ptr->
- packet + skb->len) +
- 2);
+ /*
+ * TXDWA feature is avaible to revision < 0.3 silicon of
+ * BF537 and always avaible to BF52x
+ */
+ u32 data_align = (u32)(skb->data) & 0x3;
+ if (data_align == 0x0) {
+ u16 sysctl = bfin_read_EMAC_SYSCTL();
+ sysctl |= TXDWA;
+ bfin_write_EMAC_SYSCTL(sysctl);
+
+ /* move skb->data to current_tx_ptr payload */
+ data = (u16 *)(skb->data) - 2;
+ *data = (u16)(skb->len);
+ current_tx_ptr->desc_a.start_addr = (u32)data;
+ /* this is important! */
+ blackfin_dcache_flush_range(
+ (u32)data,
+ (u32)((u8 *)data + skb->len + 4));
+ } else if (data_align == 0x2) {
+ u16 sysctl = bfin_read_EMAC_SYSCTL();
+ sysctl &= ~TXDWA;
+ bfin_write_EMAC_SYSCTL(sysctl);
+
+ /* move skb->data to current_tx_ptr payload */
+ data = (u16 *)(skb->data) - 1;
+ *data = (u16)(skb->len);
+ current_tx_ptr->desc_a.start_addr = (u32)data;
+ /* this is important! */
+ blackfin_dcache_flush_range(
+ (u32)data,
+ (u32)((u8 *)data + skb->len + 4));
+ } else {
+ u16 sysctl = bfin_read_EMAC_SYSCTL();
+ sysctl &= ~TXDWA;
+ bfin_write_EMAC_SYSCTL(sysctl);
+
+ *((u16 *)(current_tx_ptr->packet)) = (u16)(skb->len);
+ memcpy((u8 *)(current_tx_ptr->packet + 2), skb->data,
+ skb->len);
+ current_tx_ptr->desc_a.start_addr =
+ (u32)current_tx_ptr->packet;
+ if (current_tx_ptr->status.status_word != 0)
+ current_tx_ptr->status.status_word = 0;
+ blackfin_dcache_flush_range(
+ (u32)current_tx_ptr->packet,
+ (u32)(current_tx_ptr->packet + skb->len + 2));
+ }