net: mt7628-eth: add support to isolate LAN/WAN ports

This patch add support for mt7628-eth to isolate LAN/WAN ports mainly to
prevent LAN devices from getting IP address from WAN.

Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>

diff --git a/drivers/net/mt7628-eth.c b/drivers/net/mt7628-eth.c
index d77da26..a1d12f6 100644 (file)
--- a/drivers/net/mt7628-eth.c
+++ b/drivers/net/mt7628-eth.c
@@ -57,6 +57,11 @@
 /* Ethernet switch register */
 #define MT7628_SWITCH_FCT0     0x0008
 #define MT7628_SWITCH_PFC1     0x0014
+#define MT7628_SWITCH_PVIDC0   0x0040
+#define MT7628_SWITCH_PVIDC1   0x0044
+#define MT7628_SWITCH_PVIDC2   0x0048
+#define MT7628_SWITCH_PVIDC3   0x004c
+#define MT7628_SWITCH_VMSC0    0x0070
 #define MT7628_SWITCH_FPA      0x0084
 #define MT7628_SWITCH_SOCPC    0x008c
 #define MT7628_SWITCH_POC0     0x0090
@@ -140,6 +145,8 @@ struct mt7628_eth_dev {
        struct reset_ctl        rst_ephy;
 
        struct phy_device *phy;
+
+       int wan_port;
 };
 
 static int mt7628_eth_free_pkt(struct udevice *dev, uchar *packet, int length);
@@ -272,6 +279,9 @@ static void mt7628_ephy_init(struct mt7628_eth_dev *priv)
 static void rt305x_esw_init(struct mt7628_eth_dev *priv)
 {
        void __iomem *base = priv->eth_sw_base;
+       void __iomem *reg;
+       u32 val = 0, pvid;
+       int i;
 
        /*
         * FC_RLS_TH=200, FC_SET_TH=160
@@ -293,6 +303,25 @@ static void rt305x_esw_init(struct mt7628_eth_dev *priv)
        /* 1us cycle number=125 (FE's clock=125Mhz) */
        writel(0x7d000000, base + MT7628_SWITCH_BMU_CTRL);
 
+       /* LAN/WAN partition, WAN port will be unusable in u-boot network */
+       if (priv->wan_port >= 0 && priv->wan_port < 6) {
+               for (i = 0; i < 8; i++) {
+                       pvid = i == priv->wan_port ? 2 : 1;
+                       reg = base + MT7628_SWITCH_PVIDC0 + (i / 2) * 4;
+                       if (i % 2 == 0) {
+                               val = pvid;
+                       } else {
+                               val |= (pvid << 12);
+                               writel(val, reg);
+                       }
+               }
+
+               val = 0xffff407f;
+               val |= 1 << (8 + priv->wan_port);
+               val &= ~(1 << priv->wan_port);
+               writel(val, base + MT7628_SWITCH_VMSC0);
+       }
+
        /* Reset PHY */
        reset_assert(&priv->rst_ephy);
        reset_deassert(&priv->rst_ephy);
@@ -543,6 +572,9 @@ static int mt7628_eth_probe(struct udevice *dev)
                return ret;
        }
 
+       /* WAN port will be isolated from LAN ports */
+       priv->wan_port = dev_read_u32_default(dev, "mediatek,wan-port", -1);
+
        /* Put rx and tx rings into KSEG1 area (uncached) */
        priv->tx_ring = (struct fe_tx_dma *)
                KSEG1ADDR(memalign(ARCH_DMA_MINALIGN,