Initialize GbEthernet dmac found on RZ/G2L SoC.
This patch also renames ravb_rcar_dmac_init to ravb_dmac_init_rcar
to be consistent with the naming convention used in sh_eth driver.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
 drivers/net/ethernet/renesas/ravb.h      |  4 ++
 drivers/net/ethernet/renesas/ravb_main.c | 84 +++++++++++++++++++++++-
 2 files changed, 85 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index 0ce0c13ef8cb..bee05e6fb815 100644
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h

@@ -81,6 +81,7 @@ enum ravb_reg {
 	RQC3	= 0x00A0,
 	RQC4	= 0x00A4,
 	RPC	= 0x00B0,
+	RTC	= 0x00B4,	/* RZ/G2L only */

 	UFCW	= 0x00BC,
 	UFCS	= 0x00C0,
 	UFCV0	= 0x00C4,

@@ -156,6 +157,7 @@ enum ravb_reg {
 	TIS	= 0x037C,
 	ISS	= 0x0380,
 	CIE	= 0x0384,	/* R-Car Gen3 only */
+	RIC3	= 0x0388,	/* RZ/G2L only */

 	GCCR	= 0x0390,
 	GMTT	= 0x0394,
 	GPTC	= 0x0398,

@@ -956,6 +958,8 @@ enum RAVB_QUEUE {
 
 #define RX_BUF_SZ	(2048 - ETH_FCS_LEN + sizeof(__sum16))
 
+#define RGETH_RX_BUFF_MAX 8192
+
 struct ravb_tstamp_skb {
 	struct list_head list;
 	struct sk_buff *skb;

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 2422e74d9b4f..54c4d31a6950 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c

@@ -83,6 +83,11 @@ static int ravb_config(struct net_device *ndev)
 	return error;
 }
 
+static void ravb_rgeth_set_rate(struct net_device *ndev)
+{
+	/* Place holder */
+}
+
 static void ravb_set_rate(struct net_device *ndev)
 {
 	struct ravb_private *priv = netdev_priv(ndev);

@@ -217,6 +222,11 @@ static int ravb_tx_free(struct net_device *ndev, int q, bool free_txed_only)
 	return free_num;
 }
 
+static void ravb_rx_ring_free_rgeth(struct net_device *ndev, int q)
+{
+	/* Place holder */
+}
+
 static void ravb_rx_ring_free(struct net_device *ndev, int q)
 {
 	struct ravb_private *priv = netdev_priv(ndev);

@@ -283,6 +293,11 @@ static void ravb_ring_free(struct net_device *ndev, int q)
 	priv->tx_skb[q] = NULL;
 }
 
+static void ravb_rx_ring_format_rgeth(struct net_device *ndev, int q)
+{
+	/* Place holder */
+}
+
 static void ravb_rx_ring_format(struct net_device *ndev, int q)
 {
 	struct ravb_private *priv = netdev_priv(ndev);

@@ -356,6 +371,12 @@ static void ravb_ring_format(struct net_device *ndev, int q)
 	desc->dptr = cpu_to_le32((u32)priv->tx_desc_dma[q]);
 }
 
+static void *ravb_rgeth_alloc_rx_desc(struct net_device *ndev, int q)
+{
+	/* Place holder */
+	return NULL;
+}
+
 static void *ravb_alloc_rx_desc(struct net_device *ndev, int q)
 {
 	struct ravb_private *priv = netdev_priv(ndev);

@@ -426,6 +447,11 @@ static int ravb_ring_init(struct net_device *ndev, int q)
 	return -ENOMEM;
 }
 
+static void ravb_rgeth_emac_init(struct net_device *ndev)
+{
+	/* Place holder */
+}
+
 static void ravb_rcar_emac_init(struct net_device *ndev)
 {
 	/* Receive frame limit set register */

@@ -461,7 +487,32 @@ static void ravb_emac_init(struct net_device *ndev)
 	info->emac_init(ndev);
 }
 
-static void ravb_rcar_dmac_init(struct net_device *ndev)
+static void ravb_dmac_init_rgeth(struct net_device *ndev)
+{
+	/* Set AVB RX */
+	ravb_write(ndev, 0x60000000, RCR);
+
+	/* Set Max Frame Length (RTC) */
+	ravb_write(ndev, 0x7ffc0000 | RGETH_RX_BUFF_MAX, RTC);