net: ethernet: stmicro: stmmac: dwmac-rk: Add rv1126 support

Rockchip RV1126 has GMAC 10/100/1000M ethernet controller
via RGMII and RMII interfaces are configured via M0 and M1 pinmux.

This patch adds rv1126 support by adding delay lines of M0 and M1
simultaneously.
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Signed-off-by: David Wu <david.wu@rock-chips.com>
Signed-off-by: Anand Moon <anand@edgeble.ai>
Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Link: https://lore.kernel.org/r/20220920140944.2535-2-anand@edgeble.aiSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c

@@ -1297,6 +1297,130 @@ static const struct rk_gmac_ops rv1108_ops = {
 	.set_rmii_speed = rv1108_set_rmii_speed,
 };
 
+#define RV1126_GRF_GMAC_CON0		0X0070
+#define RV1126_GRF_GMAC_CON1		0X0074
+#define RV1126_GRF_GMAC_CON2		0X0078
+
+/* RV1126_GRF_GMAC_CON0 */
+#define RV1126_GMAC_PHY_INTF_SEL_RGMII	\
+		(GRF_BIT(4) | GRF_CLR_BIT(5) | GRF_CLR_BIT(6))
+#define RV1126_GMAC_PHY_INTF_SEL_RMII	\
+		(GRF_CLR_BIT(4) | GRF_CLR_BIT(5) | GRF_BIT(6))
+#define RV1126_GMAC_FLOW_CTRL			GRF_BIT(7)
+#define RV1126_GMAC_FLOW_CTRL_CLR		GRF_CLR_BIT(7)
+#define RV1126_GMAC_M0_RXCLK_DLY_ENABLE		GRF_BIT(1)
+#define RV1126_GMAC_M0_RXCLK_DLY_DISABLE	GRF_CLR_BIT(1)
+#define RV1126_GMAC_M0_TXCLK_DLY_ENABLE		GRF_BIT(0)
+#define RV1126_GMAC_M0_TXCLK_DLY_DISABLE	GRF_CLR_BIT(0)
+#define RV1126_GMAC_M1_RXCLK_DLY_ENABLE		GRF_BIT(3)
+#define RV1126_GMAC_M1_RXCLK_DLY_DISABLE	GRF_CLR_BIT(3)
+#define RV1126_GMAC_M1_TXCLK_DLY_ENABLE		GRF_BIT(2)
+#define RV1126_GMAC_M1_TXCLK_DLY_DISABLE	GRF_CLR_BIT(2)
+
+/* RV1126_GRF_GMAC_CON1 */
+#define RV1126_GMAC_M0_CLK_RX_DL_CFG(val)	HIWORD_UPDATE(val, 0x7F, 8)
+#define RV1126_GMAC_M0_CLK_TX_DL_CFG(val)	HIWORD_UPDATE(val, 0x7F, 0)
+/* RV1126_GRF_GMAC_CON2 */
+#define RV1126_GMAC_M1_CLK_RX_DL_CFG(val)	HIWORD_UPDATE(val, 0x7F, 8)
+#define RV1126_GMAC_M1_CLK_TX_DL_CFG(val)	HIWORD_UPDATE(val, 0x7F, 0)
+
+static void rv1126_set_to_rgmii(struct rk_priv_data *bsp_priv,
+				int tx_delay, int rx_delay)
+{
+	struct device *dev = &bsp_priv->pdev->dev;
+
+	if (IS_ERR(bsp_priv->grf)) {
+		dev_err(dev, "Missing rockchip,grf property\n");
+		return;
+	}
+
+	regmap_write(bsp_priv->grf, RV1126_GRF_GMAC_CON0,
+		     RV1126_GMAC_PHY_INTF_SEL_RGMII |
+		     RV1126_GMAC_M0_RXCLK_DLY_ENABLE |
+		     RV1126_GMAC_M0_TXCLK_DLY_ENABLE |
+		     RV1126_GMAC_M1_RXCLK_DLY_ENABLE |
+		     RV1126_GMAC_M1_TXCLK_DLY_ENABLE);
+
+	regmap_write(bsp_priv->grf, RV1126_GRF_GMAC_CON1,
+		     RV1126_GMAC_M0_CLK_RX_DL_CFG(rx_delay) |
+		     RV1126_GMAC_M0_CLK_TX_DL_CFG(tx_delay));
+
+	regmap_write(bsp_priv->grf, RV1126_GRF_GMAC_CON2,
+		     RV1126_GMAC_M1_CLK_RX_DL_CFG(rx_delay) |
+		     RV1126_GMAC_M1_CLK_TX_DL_CFG(tx_delay));
+}
+
+static void rv1126_set_to_rmii(struct rk_priv_data *bsp_priv)
+{
+	struct device *dev = &bsp_priv->pdev->dev;
+
+	if (IS_ERR(bsp_priv->grf)) {
+		dev_err(dev, "%s: Missing rockchip,grf property\n", __func__);
+		return;
+	}
+
+	regmap_write(bsp_priv->grf, RV1126_GRF_GMAC_CON0,
+		     RV1126_GMAC_PHY_INTF_SEL_RMII);
+}
+
+static void rv1126_set_rgmii_speed(struct rk_priv_data *bsp_priv, int speed)
+{
+	struct device *dev = &bsp_priv->pdev->dev;
+	unsigned long rate;
+	int ret;
+
+	switch (speed) {
+	case 10:
+		rate = 2500000;
+		break;
+	case 100:
+		rate = 25000000;
+		break;
+	case 1000:
+		rate = 125000000;
+		break;
+	default:
+		dev_err(dev, "unknown speed value for RGMII speed=%d", speed);
+		return;
+	}
+
+	ret = clk_set_rate(bsp_priv->clk_mac_speed, rate);
+	if (ret)
+		dev_err(dev, "%s: set clk_mac_speed rate %ld failed %d\n",
+			__func__, rate, ret);
+}
+
+static void rv1126_set_rmii_speed(struct rk_priv_data *bsp_priv, int speed)
+{
+	struct device *dev = &bsp_priv->pdev->dev;
+	unsigned long rate;
+	int ret;
+
+	switch (speed) {
+	case 10:
+		rate = 2500000;
+		break;
+	case 100:
+		rate = 25000000;
+		break;
+	default:
+		dev_err(dev, "unknown speed value for RGMII speed=%d", speed);
+		return;
+	}
+
+	ret = clk_set_rate(bsp_priv->clk_mac_speed, rate);
+	if (ret)
+		dev_err(dev, "%s: set clk_mac_speed rate %ld failed %d\n",
+			__func__, rate, ret);
+}
+
+static const struct rk_gmac_ops rv1126_ops = {
+	.set_to_rgmii = rv1126_set_to_rgmii,
+	.set_to_rmii = rv1126_set_to_rmii,
+	.set_rgmii_speed = rv1126_set_rgmii_speed,
+	.set_rmii_speed = rv1126_set_rmii_speed,
+};
+
 #define RK_GRF_MACPHY_CON0		0xb00
 #define RK_GRF_MACPHY_CON1		0xb04
 #define RK_GRF_MACPHY_CON2		0xb08
@@ -1836,6 +1960,7 @@ static const struct of_device_id rk_gmac_dwmac_match[] = {
 	{ .compatible = "rockchip,rk3568-gmac", .data = &rk3568_ops },
 	{ .compatible = "rockchip,rk3588-gmac", .data = &rk3588_ops },
 	{ .compatible = "rockchip,rv1108-gmac", .data = &rv1108_ops },
+	{ .compatible = "rockchip,rv1126-gmac", .data = &rv1126_ops },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, rk_gmac_dwmac_match);