[U-Boot] [PATCH 6/8] net/ethoc: support private memory configurations

[Max Filippov]

From: Chris Zankel <chris at zankel.net>

The 'ethoc' device could also be configured to have a private memory
region instead of having access to the main memory. In that case,
the packets must be copied into (transmit) or out of (receive) that
memory.

This behavior is configured by defining CONFIG_SYS_ETHOC_BUFFER_ADDR.
Make sure to have enough memory for the configured buffers
(one for transmit, and 'PKTBUFSRX' for receive)

Signed-off-by: Chris Zankel <chris at zankel.net>
Signed-off-by: Max Filippov <jcmvbkbc at gmail.com>
---
 drivers/net/ethoc.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/net/ethoc.c b/drivers/net/ethoc.c
index edb3c80..ee7c01e 100644
--- a/drivers/net/ethoc.c
+++ b/drivers/net/ethoc.c
@@ -248,6 +248,9 @@ static int ethoc_init_ring(struct eth_device *dev)
 {
 	struct ethoc *priv = (struct ethoc *)dev->priv;
 	struct ethoc_bd bd;
+#ifdef CONFIG_SYS_ETHOC_BUFFER_ADDR
+	unsigned long addr = CONFIG_SYS_ETHOC_BUFFER_ADDR;
+#endif
 	int i;
 
 	priv->cur_tx = 0;
@@ -258,6 +261,10 @@ static int ethoc_init_ring(struct eth_device *dev)
 	bd.stat = TX_BD_IRQ | TX_BD_CRC;
 
 	for (i = 0; i < priv->num_tx; i++) {
+#ifdef CONFIG_SYS_ETHOC_BUFFER_ADDR
+		bd.addr = addr;
+		addr += PKTSIZE_ALIGN;
+#endif
 		if (i == priv->num_tx - 1)
 			bd.stat |= TX_BD_WRAP;
 
@@ -267,7 +274,12 @@ static int ethoc_init_ring(struct eth_device *dev)
 	bd.stat = RX_BD_EMPTY | RX_BD_IRQ;
 
 	for (i = 0; i < priv->num_rx; i++) {
+#ifdef CONFIG_SYS_ETHOC_BUFFER_ADDR
+		bd.addr = addr;
+		addr += PKTSIZE_ALIGN;
+#else
 		bd.addr = (u32)net_rx_packets[i];
+#endif
 		if (i == priv->num_rx - 1)
 			bd.stat |= RX_BD_WRAP;
 
@@ -372,7 +384,12 @@ static int ethoc_rx(struct eth_device *dev, int limit)
 		if (ethoc_update_rx_stats(&bd) == 0) {
 			int size = bd.stat >> 16;
 			size -= 4;	/* strip the CRC */
+#ifdef CONFIG_SYS_ETHOC_BUFFER_ADDR
+			memcpy(net_rx_packets[0], (void *)bd.addr, size);
+			net_process_received_packet(net_rx_packets[0], size);
+#else
 			net_process_received_packet((void *)bd.addr, size);
+#endif
 		}
 
 		/* clear the buffer descriptor so it can be reused */
@@ -428,7 +445,11 @@ static int ethoc_send(struct eth_device *dev, void *packet, int length)
 		bd.stat |= TX_BD_PAD;
 	else
 		bd.stat &= ~TX_BD_PAD;
+#ifdef CONFIG_SYS_ETHOC_BUFFER_ADDR
+	memcpy((void *)bd.addr, (const void *)packet, length);
+#else
 	bd.addr = (u32)packet;
+#endif
 
 	flush_dcache_range(bd.addr, bd.addr + length);
 	bd.stat &= ~(TX_BD_STATS | TX_BD_LEN_MASK);
-- 
2.1.4