net: gmac_rockchip: Add support for the RK3368 GMAC

The GMAC in the RK3368 once again is identical to the incarnation in
the RK3288 and the RK3399, except for where some of the configuration
and control registers are located in the GRF.

This adds the RK3368-specific logic necessary to reuse this driver.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

arch/arm/include/asm/arch-rockchip/grf_rk3368.h

@@ -129,4 +129,5 @@ enum {
 	MCU_CODE_BASE_BIT31_BIT28_SHIFT		= 0,
 	MCU_CODE_BASE_BIT31_BIT28_MASK		= GENMASK(3, 0),
 };
+
 #endif

drivers/net/gmac_rockchip.c

@@ -16,6 +16,7 @@
 #include <asm/arch/clock.h>
 #include <asm/arch/hardware.h>
 #include <asm/arch/grf_rk3288.h>
+#include <asm/arch/grf_rk3368.h>
 #include <asm/arch/grf_rk3399.h>
 #include <dm/pinctrl.h>
 #include <dt-bindings/clock/rk3288-cru.h>
@@ -83,6 +84,38 @@ static int rk3288_gmac_fix_mac_speed(struct dw_eth_dev *priv)
 	return 0;
 }
 
+static int rk3368_gmac_fix_mac_speed(struct dw_eth_dev *priv)
+{
+	struct rk3368_grf *grf;
+	int clk;
+	enum {
+		RK3368_GMAC_CLK_SEL_2_5M = 2 << 4,
+		RK3368_GMAC_CLK_SEL_25M = 3 << 4,
+		RK3368_GMAC_CLK_SEL_125M = 0 << 4,
+		RK3368_GMAC_CLK_SEL_MASK = GENMASK(5, 4),
+	};
+
+	switch (priv->phydev->speed) {
+	case 10:
+		clk = RK3368_GMAC_CLK_SEL_2_5M;
+		break;
+	case 100:
+		clk = RK3368_GMAC_CLK_SEL_25M;
+		break;
+	case 1000:
+		clk = RK3368_GMAC_CLK_SEL_125M;
+		break;
+	default:
+		debug("Unknown phy speed: %d\n", priv->phydev->speed);
+		return -EINVAL;
+	}
+
+	grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
+	rk_clrsetreg(&grf->soc_con15, RK3368_GMAC_CLK_SEL_MASK, clk);
+
+	return 0;
+}
+
 static int rk3399_gmac_fix_mac_speed(struct dw_eth_dev *priv)
 {
 	struct rk3399_grf_regs *grf;
@@ -129,6 +162,44 @@ static void rk3288_gmac_set_to_rgmii(struct gmac_rockchip_platdata *pdata)
 		     pdata->tx_delay << RK3288_CLK_TX_DL_CFG_GMAC_SHIFT);
 }
 
+static void rk3368_gmac_set_to_rgmii(struct gmac_rockchip_platdata *pdata)
+{
+	struct rk3368_grf *grf;
+	enum {
+		RK3368_GMAC_PHY_INTF_SEL_RGMII = 1 << 9,
+		RK3368_GMAC_PHY_INTF_SEL_MASK = GENMASK(11, 9),
+		RK3368_RMII_MODE_MASK  = BIT(6),
+		RK3368_RMII_MODE       = BIT(6),
+	};
+	enum {
+		RK3368_RXCLK_DLY_ENA_GMAC_MASK = BIT(15),
+		RK3368_RXCLK_DLY_ENA_GMAC_DISABLE = 0,
+		RK3368_RXCLK_DLY_ENA_GMAC_ENABLE = BIT(15),
+		RK3368_TXCLK_DLY_ENA_GMAC_MASK = BIT(7),
+		RK3368_TXCLK_DLY_ENA_GMAC_DISABLE = 0,
+		RK3368_TXCLK_DLY_ENA_GMAC_ENABLE = BIT(7),
+		RK3368_CLK_RX_DL_CFG_GMAC_SHIFT = 8,
+		RK3368_CLK_RX_DL_CFG_GMAC_MASK = GENMASK(14, 8),
+		RK3368_CLK_TX_DL_CFG_GMAC_SHIFT = 0,
+		RK3368_CLK_TX_DL_CFG_GMAC_MASK = GENMASK(6, 0),
+	};
+
+	grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
+	rk_clrsetreg(&grf->soc_con15,
+		     RK3368_RMII_MODE_MASK | RK3368_GMAC_PHY_INTF_SEL_MASK,
+		     RK3368_GMAC_PHY_INTF_SEL_RGMII);
+
+	rk_clrsetreg(&grf->soc_con16,
+		     RK3368_RXCLK_DLY_ENA_GMAC_MASK |
+		     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 |
+		     pdata->rx_delay << RK3368_CLK_RX_DL_CFG_GMAC_SHIFT |
+		     pdata->tx_delay << RK3368_CLK_TX_DL_CFG_GMAC_SHIFT);
+}
+
 static void rk3399_gmac_set_to_rgmii(struct gmac_rockchip_platdata *pdata)
 {
 	struct rk3399_grf_regs *grf;
@@ -208,6 +279,11 @@ const struct rk_gmac_ops rk3288_gmac_ops = {
 	.set_to_rgmii = rk3288_gmac_set_to_rgmii,
 };
 
+const struct rk_gmac_ops rk3368_gmac_ops = {
+	.fix_mac_speed = rk3368_gmac_fix_mac_speed,
+	.set_to_rgmii = rk3368_gmac_set_to_rgmii,
+};
+
 const struct rk_gmac_ops rk3399_gmac_ops = {
 	.fix_mac_speed = rk3399_gmac_fix_mac_speed,
 	.set_to_rgmii = rk3399_gmac_set_to_rgmii,
@@ -216,6 +292,8 @@ const struct rk_gmac_ops rk3399_gmac_ops = {
 static const struct udevice_id rockchip_gmac_ids[] = {
 	{ .compatible = "rockchip,rk3288-gmac",
 	  .data = (ulong)&rk3288_gmac_ops },
+	{ .compatible = "rockchip,rk3368-gmac",
+	  .data = (ulong)&rk3368_gmac_ops },
 	{ .compatible = "rockchip,rk3399-gmac",
 	  .data = (ulong)&rk3399_gmac_ops },
 	{ }