[U-Boot] [PATCH 3/3] net: zynq: Disable secondary queues

[Michal Simek]

From: "Edgar E. Iglesias" <edgar.iglesias at xilinx.com>

Zynq has no priority queues.
ZynqMP requires this change to get network working.
This patch was not needed on ep108 for uknown reason even it should be
used.
Tested on Zynq and ZynqMP.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias at xilinx.com>
Signed-off-by: Michal Simek <michal.simek at xilinx.com>
---

 drivers/net/zynq_gem.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/net/zynq_gem.c b/drivers/net/zynq_gem.c
index f32862fd0b2e..0e741dd605a6 100644
--- a/drivers/net/zynq_gem.c
+++ b/drivers/net/zynq_gem.c
@@ -131,6 +131,10 @@ struct zynq_gem_regs {
 	u32 reserved6[18];
 #define STAT_SIZE	44
 	u32 stat[STAT_SIZE]; /* 0x100 - Octects transmitted Low reg */
+	u32 reserved7[164];
+	u32 transmit_q1_ptr; /* 0x440 - Transmit priority queue 1 */
+	u32 reserved8[15];
+	u32 receive_q1_ptr; /* 0x480 - Receive priority queue 1 */
 };
 
 /* BD descriptors */
@@ -304,6 +308,8 @@ static int zynq_gem_init(struct eth_device *dev, bd_t * bis)
 	struct phy_device *phydev;
 	struct zynq_gem_regs *regs = (struct zynq_gem_regs *)dev->iobase;
 	struct zynq_gem_priv *priv = dev->priv;
+	struct emac_bd *dummy_tx_bd = &priv->tx_bd[4];
+	struct emac_bd *dummy_rx_bd = &priv->tx_bd[6];
 	const u32 supported = SUPPORTED_10baseT_Half |
 			SUPPORTED_10baseT_Full |
 			SUPPORTED_100baseT_Half |
@@ -352,6 +358,26 @@ static int zynq_gem_init(struct eth_device *dev, bd_t * bis)
 		/* Setup for Network Control register, MDIO, Rx and Tx enable */
 		setbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_MDEN_MASK);
 
+		/*
+		 * Disable the second priority queue.
+		 * FIXME: Consider GEMs with more than 2 queues.
+		 */
+		dummy_tx_bd->addr = 0;
+		dummy_tx_bd->status = ZYNQ_GEM_TXBUF_WRAP_MASK |
+				ZYNQ_GEM_TXBUF_LAST_MASK|
+				ZYNQ_GEM_TXBUF_USED_MASK;
+
+		dummy_rx_bd->addr = ZYNQ_GEM_RXBUF_WRAP_MASK |
+				ZYNQ_GEM_RXBUF_NEW_MASK;
+		dummy_rx_bd->status = 0;
+		flush_dcache_range((ulong)&dummy_tx_bd, (ulong)&dummy_tx_bd +
+				   sizeof(dummy_tx_bd));
+		flush_dcache_range((ulong)&dummy_rx_bd, (ulong)&dummy_rx_bd +
+				   sizeof(dummy_rx_bd));
+
+		writel((u32)dummy_tx_bd, &regs->transmit_q1_ptr);
+		writel((u32)dummy_rx_bd, &regs->receive_q1_ptr);
+
 		priv->init++;
 	}
 
-- 
2.5.0