net: gmac_rockchip: Add handling for RGMII_ID/RXID/TXID

Using PHY internal delays in combination with the phy-mode
rgmii-id/rxid/txid was not possible. Only rgmii was supported.

Now we can disable rockchip's gmac delay lines and also use
rgmii-id/rxid/txid.

Based on commit eaf70ad14cbb ("net: stmmac: dwmac-rk: Add
handling for RGMII_ID/RXID/TXID") for mainline linux kernel.

Signed-off-by: Janine Hagemann <j.hagemann@phytec.de>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: David Wu <david.wu@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

drivers/net/gmac_rockchip.c

@@ -24,6 +24,11 @@
 #include <dt-bindings/clock/rk3288-cru.h>
 #include "designware.h"
 
+DECLARE_GLOBAL_DATA_PTR;
+#define DELAY_ENABLE(soc, tx, rx) \
+	(((tx) ? soc##_TXCLK_DLY_ENA_GMAC_ENABLE : soc##_TXCLK_DLY_ENA_GMAC_DISABLE) | \
+	((rx) ? soc##_RXCLK_DLY_ENA_GMAC_ENABLE : soc##_RXCLK_DLY_ENA_GMAC_DISABLE))
+
 /*
  * Platform data for the gmac
  *
@@ -286,8 +291,7 @@ static void rk3228_gmac_set_to_rgmii(struct gmac_rockchip_platdata *pdata)
 		     RK3228_RXCLK_DLY_ENA_GMAC_MASK |
 		     RK3228_TXCLK_DLY_ENA_GMAC_MASK,
 		     RK3228_GMAC_PHY_INTF_SEL_RGMII |
-		     RK3228_RXCLK_DLY_ENA_GMAC_ENABLE |
-		     RK3228_TXCLK_DLY_ENA_GMAC_ENABLE);
+		     DELAY_ENABLE(RK3228, pdata->tx_delay, pdata->rx_delay));
 
 	rk_clrsetreg(&grf->mac_con[0],
 		     RK3228_CLK_RX_DL_CFG_GMAC_MASK |
@@ -310,8 +314,7 @@ static void rk3288_gmac_set_to_rgmii(struct gmac_rockchip_platdata *pdata)
 		     RK3288_TXCLK_DLY_ENA_GMAC_MASK |
 		     RK3288_CLK_RX_DL_CFG_GMAC_MASK |
 		     RK3288_CLK_TX_DL_CFG_GMAC_MASK,
-		     RK3288_RXCLK_DLY_ENA_GMAC_ENABLE |
-		     RK3288_TXCLK_DLY_ENA_GMAC_ENABLE |
+		     DELAY_ENABLE(RK3288, pdata->rx_delay, pdata->tx_delay) |
 		     pdata->rx_delay << RK3288_CLK_RX_DL_CFG_GMAC_SHIFT |
 		     pdata->tx_delay << RK3288_CLK_TX_DL_CFG_GMAC_SHIFT);
 }
@@ -350,8 +353,7 @@ static void rk3328_gmac_set_to_rgmii(struct gmac_rockchip_platdata *pdata)
 		     RK3328_RXCLK_DLY_ENA_GMAC_MASK |
 		     RK3328_TXCLK_DLY_ENA_GMAC_MASK,
 		     RK3328_GMAC_PHY_INTF_SEL_RGMII |
-		     RK3328_RXCLK_DLY_ENA_GMAC_ENABLE |
-		     RK3328_TXCLK_DLY_ENA_GMAC_ENABLE);
+		     DELAY_ENABLE(RK3328, pdata->tx_delay, pdata->rx_delay));
 
 	rk_clrsetreg(&grf->mac_con[0],
 		     RK3328_CLK_RX_DL_CFG_GMAC_MASK |
@@ -392,8 +394,7 @@ static void rk3368_gmac_set_to_rgmii(struct gmac_rockchip_platdata *pdata)
 		     RK3368_TXCLK_DLY_ENA_GMAC_MASK |
 		     RK3368_CLK_RX_DL_CFG_GMAC_MASK |
 		     RK3368_CLK_TX_DL_CFG_GMAC_MASK,
-		     RK3368_RXCLK_DLY_ENA_GMAC_ENABLE |
-		     RK3368_TXCLK_DLY_ENA_GMAC_ENABLE |
+		     DELAY_ENABLE(RK3368, pdata->tx_delay, pdata->rx_delay) |
 		     pdata->rx_delay << RK3368_CLK_RX_DL_CFG_GMAC_SHIFT |
 		     pdata->tx_delay << RK3368_CLK_TX_DL_CFG_GMAC_SHIFT);
 }
@@ -413,8 +414,7 @@ static void rk3399_gmac_set_to_rgmii(struct gmac_rockchip_platdata *pdata)
 		     RK3399_TXCLK_DLY_ENA_GMAC_MASK |
 		     RK3399_CLK_RX_DL_CFG_GMAC_MASK |
 		     RK3399_CLK_TX_DL_CFG_GMAC_MASK,
-		     RK3399_RXCLK_DLY_ENA_GMAC_ENABLE |
-		     RK3399_TXCLK_DLY_ENA_GMAC_ENABLE |
+		     DELAY_ENABLE(RK3399, pdata->tx_delay, pdata->rx_delay) |
 		     pdata->rx_delay << RK3399_CLK_RX_DL_CFG_GMAC_SHIFT |
 		     pdata->tx_delay << RK3399_CLK_TX_DL_CFG_GMAC_SHIFT);
 }
@@ -451,40 +451,86 @@ static int gmac_rockchip_probe(struct udevice *dev)
 
 	switch (eth_pdata->phy_interface) {
 	case PHY_INTERFACE_MODE_RGMII:
+		/* Set to RGMII mode */
+		if (ops->set_to_rgmii)
+			ops->set_to_rgmii(pdata);
+		else
+			return -EPERM;
+
 		/*
 		 * If the gmac clock is from internal pll, need to set and
 		 * check the return value for gmac clock at RGMII mode. If
 		 * the gmac clock is from external source, the clock rate
 		 * is not set, because of it is bypassed.
 		 */
+
 		if (!pdata->clock_input) {
 			rate = clk_set_rate(&clk, 125000000);
 			if (rate != 125000000)
 				return -EINVAL;
 		}
+		break;
 
+	case PHY_INTERFACE_MODE_RGMII_ID:
 		/* Set to RGMII mode */
-		if (ops->set_to_rgmii)
+		if (ops->set_to_rgmii) {
+			pdata->tx_delay = 0;
+			pdata->rx_delay = 0;
 			ops->set_to_rgmii(pdata);
-		else
+		} else
 			return -EPERM;
 
-		break;
-	case PHY_INTERFACE_MODE_RMII:
-		/* The commet is the same as RGMII mode */
 		if (!pdata->clock_input) {
-			rate = clk_set_rate(&clk, 50000000);
-			if (rate != 50000000)
+			rate = clk_set_rate(&clk, 125000000);
+			if (rate != 125000000)
 				return -EINVAL;
 		}
+		break;
 
+	case PHY_INTERFACE_MODE_RMII:
 		/* Set to RMII mode */
 		if (ops->set_to_rmii)
 			ops->set_to_rmii(pdata);
 		else
 			return -EPERM;
 
+		if (!pdata->clock_input) {
+			rate = clk_set_rate(&clk, 50000000);
+			if (rate != 50000000)
+				return -EINVAL;
+		}
+		break;
+
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+		 /* Set to RGMII_RXID mode */
+		if (ops->set_to_rgmii) {
+			pdata->tx_delay = 0;
+			ops->set_to_rgmii(pdata);
+		} else
+			return -EPERM;
+
+		if (!pdata->clock_input) {
+			rate = clk_set_rate(&clk, 125000000);
+			if (rate != 125000000)
+				return -EINVAL;
+		}
 		break;
+
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+		/* Set to RGMII_TXID mode */
+		if (ops->set_to_rgmii) {
+			pdata->rx_delay = 0;
+			ops->set_to_rgmii(pdata);
+		} else
+			return -EPERM;
+
+		if (!pdata->clock_input) {
+			rate = clk_set_rate(&clk, 125000000);
+			if (rate != 125000000)
+				return -EINVAL;
+		}
+		break;
+
 	default:
 		debug("NO interface defined!\n");
 		return -ENXIO;