[PATCH 22/29] net: mediatek: add support for GMAC/USB3 PHY mux mode for MT7981

[Weijie Gao]

MT7981 has its GMAC2 PHY shared with USB3. To enable GMAC2, mux
register must be set to connect the SGMII phy to GMAC2.

Signed-off-by: Weijie Gao <weijie.gao at mediatek.com>
---
 drivers/net/mtk_eth.c | 33 ++++++++++++++++++++++++++++++++-
 drivers/net/mtk_eth.h | 16 ++++++++++++++++
 2 files changed, 48 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mtk_eth.c b/drivers/net/mtk_eth.c
index e0064276d0..064b4a41db 100644
--- a/drivers/net/mtk_eth.c
+++ b/drivers/net/mtk_eth.c
@@ -103,6 +103,8 @@ struct mtk_eth_priv {
 
 	struct regmap *ethsys_regmap;
 
+	struct regmap *infra_regmap;
+
 	struct mii_dev *mdio_bus;
 	int (*mii_read)(struct mtk_eth_priv *priv, u8 phy, u8 reg);
 	int (*mii_write)(struct mtk_eth_priv *priv, u8 phy, u8 reg, u16 val);
@@ -186,6 +188,17 @@ static void mtk_ethsys_rmw(struct mtk_eth_priv *priv, u32 reg, u32 clr,
 	regmap_write(priv->ethsys_regmap, reg, val);
 }
 
+static void mtk_infra_rmw(struct mtk_eth_priv *priv, u32 reg, u32 clr,
+			  u32 set)
+{
+	uint val;
+
+	regmap_read(priv->infra_regmap, reg, &val);
+	val &= ~clr;
+	val |= set;
+	regmap_write(priv->infra_regmap, reg, val);
+}
+
 /* Direct MDIO clause 22/45 access via SoC */
 static int mtk_mii_rw(struct mtk_eth_priv *priv, u8 phy, u8 reg, u16 data,
 		      u32 cmd, u32 st)
@@ -1139,6 +1152,11 @@ static void mtk_mac_init(struct mtk_eth_priv *priv)
 		break;
 	case PHY_INTERFACE_MODE_SGMII:
 	case PHY_INTERFACE_MODE_2500BASEX:
+		if (MTK_HAS_CAPS(priv->soc->caps, MTK_GMAC2_U3_QPHY)) {
+			mtk_infra_rmw(priv, USB_PHY_SWITCH_REG, QPHY_SEL_MASK,
+				      SGMII_QPHY_SEL);
+		}
+
 		ge_mode = GE_MODE_RGMII;
 		mtk_ethsys_rmw(priv, ETHSYS_SYSCFG0_REG, SYSCFG0_SGMII_SEL_M,
 			       SYSCFG0_SGMII_SEL(priv->gmac_id));
@@ -1497,6 +1515,19 @@ static int mtk_eth_of_to_plat(struct udevice *dev)
 	if (IS_ERR(priv->ethsys_regmap))
 		return PTR_ERR(priv->ethsys_regmap);
 
+	if (MTK_HAS_CAPS(priv->soc->caps, MTK_INFRA)) {
+		/* get corresponding infracfg phandle */
+		ret = dev_read_phandle_with_args(dev, "mediatek,infracfg",
+						 NULL, 0, 0, &args);
+
+		if (ret)
+			return ret;
+
+		priv->infra_regmap = syscon_node_to_regmap(args.node);
+		if (IS_ERR(priv->infra_regmap))
+			return PTR_ERR(priv->infra_regmap);
+	}
+
 	/* Reset controllers */
 	ret = reset_get_by_name(dev, "fe", &priv->rst_fe);
 	if (ret) {
@@ -1614,7 +1645,7 @@ static const struct mtk_soc_data mt7986_data = {
 };
 
 static const struct mtk_soc_data mt7981_data = {
-	.caps = MT7986_CAPS,
+	.caps = MT7981_CAPS,
 	.ana_rgc3 = 0x128,
 	.pdma_base = PDMA_V2_BASE,
 	.txd_size = sizeof(struct mtk_tx_dma_v2),
diff --git a/drivers/net/mtk_eth.h b/drivers/net/mtk_eth.h
index 320266cd82..519986c01e 100644
--- a/drivers/net/mtk_eth.h
+++ b/drivers/net/mtk_eth.h
@@ -15,27 +15,38 @@
 enum mkt_eth_capabilities {
 	MTK_TRGMII_BIT,
 	MTK_TRGMII_MT7621_CLK_BIT,
+	MTK_U3_COPHY_V2_BIT,
+	MTK_INFRA_BIT,
 	MTK_NETSYS_V2_BIT,
 
 	/* PATH BITS */
 	MTK_ETH_PATH_GMAC1_TRGMII_BIT,
+	MTK_ETH_PATH_GMAC2_SGMII_BIT,
 };
 
 #define MTK_TRGMII			BIT(MTK_TRGMII_BIT)
 #define MTK_TRGMII_MT7621_CLK		BIT(MTK_TRGMII_MT7621_CLK_BIT)
+#define MTK_U3_COPHY_V2			BIT(MTK_U3_COPHY_V2_BIT)
+#define MTK_INFRA			BIT(MTK_INFRA_BIT)
 #define MTK_NETSYS_V2			BIT(MTK_NETSYS_V2_BIT)
 
 /* Supported path present on SoCs */
 #define MTK_ETH_PATH_GMAC1_TRGMII	BIT(MTK_ETH_PATH_GMAC1_TRGMII_BIT)
 
+#define MTK_ETH_PATH_GMAC2_SGMII	BIT(MTK_ETH_PATH_GMAC2_SGMII_BIT)
+
 #define MTK_GMAC1_TRGMII	(MTK_ETH_PATH_GMAC1_TRGMII | MTK_TRGMII)
 
+#define MTK_GMAC2_U3_QPHY	(MTK_ETH_PATH_GMAC2_SGMII | MTK_U3_COPHY_V2 | MTK_INFRA)
+
 #define MTK_HAS_CAPS(caps, _x)		(((caps) & (_x)) == (_x))
 
 #define MT7621_CAPS  (MTK_GMAC1_TRGMII | MTK_TRGMII_MT7621_CLK)
 
 #define MT7623_CAPS  (MTK_GMAC1_TRGMII)
 
+#define MT7981_CAPS  (MTK_GMAC2_U3_QPHY | MTK_NETSYS_V2)
+
 #define MT7986_CAPS  (MTK_NETSYS_V2)
 
 /* Frame Engine Register Bases */
@@ -56,6 +67,11 @@ enum mkt_eth_capabilities {
 #define ETHSYS_CLKCFG0_REG		0x2c
 #define ETHSYS_TRGMII_CLK_SEL362_5	BIT(11)
 
+/* Top misc registers */
+#define USB_PHY_SWITCH_REG		0x218
+#define QPHY_SEL_MASK			0x3
+#define SGMII_QPHY_SEL			0x2
+
 /* SYSCFG0_GE_MODE: GE Modes */
 #define GE_MODE_RGMII			0
 #define GE_MODE_MII			1
-- 
2.17.1