net: macb: Disable half duplex gigabit on Zynq

According to the Zynq TRM, gigabit half duplex is not supported.  Add a
new cap and compatible string so Zynq can avoid advertising that mode.

Signed-off-by: Nathan Sullivan <nathan.sullivan@ni.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 13 insertions, 0 deletions

diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index 5f10dfc631d7..fc646a41d548 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -350,6 +350,9 @@ static int macb_mii_probe(struct net_device *dev)
         else
                 phydev->supported &= PHY_BASIC_FEATURES;
 
+        if (bp->caps & MACB_CAPS_NO_GIGABIT_HALF)
+                phydev->supported &= ~SUPPORTED_1000baseT_Half;
+
         phydev->advertising = phydev->supported;
 
         bp->link = 0;
@@ -2699,6 +2702,14 @@ static const struct macb_config emac_config = {
         .init = at91ether_init,
 };
 
+static const struct macb_config zynq_config = {
+        .caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE |
+                MACB_CAPS_NO_GIGABIT_HALF,
+        .dma_burst_length = 16,
+        .clk_init = macb_clk_init,
+        .init = macb_init,
+};
+
 static const struct of_device_id macb_dt_ids[] = {
         { .compatible = "cdns,at32ap7000-macb" },
         { .compatible = "cdns,at91sam9260-macb", .data = &at91sam9260_config },
@@ -2709,6 +2720,7 @@ static const struct of_device_id macb_dt_ids[] = {
         { .compatible = "atmel,sama5d4-gem", .data = &sama5d4_config },
         { .compatible = "cdns,at91rm9200-emac", .data = &emac_config },
         { .compatible = "cdns,emac", .data = &emac_config },
+        { .compatible = "cdns,zynq-gem", .data = &zynq_config },
         { /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, macb_dt_ids);
diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
index eb7d76f7bf6a..24b1d9bcd865 100644
--- a/drivers/net/ethernet/cadence/macb.h
+++ b/drivers/net/ethernet/cadence/macb.h
@@ -393,6 +393,7 @@
 #define MACB_CAPS_ISR_CLEAR_ON_WRITE            0x00000001
 #define MACB_CAPS_USRIO_HAS_CLKEN               0x00000002
 #define MACB_CAPS_USRIO_DEFAULT_IS_MII          0x00000004
+#define MACB_CAPS_NO_GIGABIT_HALF               0x00000008
 #define MACB_CAPS_FIFO_MODE                     0x10000000
 #define MACB_CAPS_GIGABIT_MODE_AVAILABLE        0x20000000
 #define MACB_CAPS_SG_DISABLED                   0x40000000