drivers: net: xgene: Add backward compatibility

This patch adds xgene_enet_check_phy_hanlde() function that checks whether
MDIO driver is probed successfully and sets pdata->mdio_driver to true.
If MDIO driver is not probed, ethernet driver falls back to backward
compatibility mode.

Since enum xgene_enet_cmd is used by MDIO driver, removing this from
ethernet driver.

Signed-off-by: Iyappan Subramanian <isubramanian@apm.com>
Tested-by: Fushen Chen <fchen@apm.com>
Tested-by: Toan Le <toanle@apm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/apm/xgene/xgene_enet_hw.c

@@ -572,7 +572,9 @@ static void xgene_gmac_init(struct xgene_enet_pdata *pdata)
 {
 	u32 value;
 
-	xgene_gmac_reset(pdata);
+	if (!pdata->mdio_driver)
+		xgene_gmac_reset(pdata);
+
 	xgene_gmac_set_speed(pdata);
 	xgene_gmac_set_mac_addr(pdata);
 
@@ -680,6 +682,11 @@ static int xgene_enet_reset(struct xgene_enet_pdata *pdata)
 	if (!xgene_ring_mgr_init(pdata))
 		return -ENODEV;
 
+	if (pdata->mdio_driver) {
+		xgene_enet_config_ring_if_assoc(pdata);
+		return 0;
+	}
+
 	if (dev->of_node) {
 		clk_prepare_enable(pdata->clk);
 		udelay(5);
@@ -799,21 +806,47 @@ static void xgene_enet_adjust_link(struct net_device *ndev)
 	}
 }
 
-static int xgene_enet_phy_connect(struct net_device *ndev)
+#ifdef CONFIG_ACPI
+static struct acpi_device *acpi_phy_find_device(struct device *dev)
+{
+	struct acpi_reference_args args;
+	struct fwnode_handle *fw_node;
+	int status;
+
+	fw_node = acpi_fwnode_handle(ACPI_COMPANION(dev));
+	status = acpi_node_get_property_reference(fw_node, "phy-handle", 0,
+						  &args);
+	if (ACPI_FAILURE(status)) {
+		dev_dbg(dev, "No matching phy in ACPI table\n");
+		return NULL;
+	}
+
+	return args.adev;
+}
+#endif
+
+int xgene_enet_phy_connect(struct net_device *ndev)
 {
 	struct xgene_enet_pdata *pdata = netdev_priv(ndev);
-	struct device_node *phy_np;
+	struct device_node *np;
 	struct phy_device *phy_dev;
 	struct device *dev = &pdata->pdev->dev;
+	struct acpi_device *adev;
+	int i;
 
 	if (dev->of_node) {
-		phy_np = of_parse_phandle(dev->of_node, "phy-handle", 0);
-		if (!phy_np) {
+		for (i = 0 ; i < 2; i++) {
+			np = of_parse_phandle(dev->of_node, "phy-handle", i);
+			if (np)
+				break;
+		}
+
+		if (!np) {
 			netdev_dbg(ndev, "No phy-handle found in DT\n");
 			return -ENODEV;
 		}
 
-		phy_dev = of_phy_connect(ndev, phy_np, &xgene_enet_adjust_link,
+		phy_dev = of_phy_connect(ndev, np, &xgene_enet_adjust_link,
 					 0, pdata->phy_mode);
 		if (!phy_dev) {
 			netdev_err(ndev, "Could not connect to PHY\n");
@@ -822,6 +855,11 @@ static int xgene_enet_phy_connect(struct net_device *ndev)
 
 		pdata->phy_dev = phy_dev;
 	} else {
+#ifdef CONFIG_ACPI
+		adev = acpi_phy_find_device(dev);
+		if (adev)
+			pdata->phy_dev =  adev->driver_data;
+
 		phy_dev = pdata->phy_dev;
 
 		if (!phy_dev ||
@@ -830,6 +868,7 @@ static int xgene_enet_phy_connect(struct net_device *ndev)
 			netdev_err(ndev, "Could not connect to PHY\n");
 			return  -ENODEV;
 		}
+#endif
 	}
 
 	pdata->phy_speed = SPEED_UNKNOWN;
@@ -930,6 +969,12 @@ int xgene_enet_mdio_config(struct xgene_enet_pdata *pdata)
 	return ret;
 }
 
+void xgene_enet_phy_disconnect(struct xgene_enet_pdata *pdata)
+{
+	if (pdata->phy_dev)
+		phy_disconnect(pdata->phy_dev);
+}
+
 void xgene_enet_mdio_remove(struct xgene_enet_pdata *pdata)
 {
 	if (pdata->phy_dev)

drivers/net/ethernet/apm/xgene/xgene_enet_hw.h

@@ -301,11 +301,6 @@ enum xgene_enet_ring_bufnum {
 	RING_BUFNUM_INVALID
 };
 
-enum xgene_enet_cmd {
-	XGENE_ENET_WR_CMD = BIT(31),
-	XGENE_ENET_RD_CMD = BIT(30)
-};
-
 enum xgene_enet_err_code {
 	HBF_READ_DATA = 3,
 	HBF_LL_READ = 4,
@@ -351,6 +346,8 @@ void xgene_enet_parse_error(struct xgene_enet_desc_ring *ring,
 int xgene_enet_mdio_config(struct xgene_enet_pdata *pdata);
 void xgene_enet_mdio_remove(struct xgene_enet_pdata *pdata);
 bool xgene_ring_mgr_init(struct xgene_enet_pdata *p);
+int xgene_enet_phy_connect(struct net_device *ndev);
+void xgene_enet_phy_disconnect(struct xgene_enet_pdata *pdata);
 
 extern const struct xgene_mac_ops xgene_gmac_ops;
 extern const struct xgene_port_ops xgene_gport_ops;

drivers/net/ethernet/apm/xgene/xgene_enet_main.c

@@ -763,7 +763,7 @@ static int xgene_enet_close(struct net_device *ndev)
 	mac_ops->tx_disable(pdata);
 	mac_ops->rx_disable(pdata);
 
-	if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII)
+	if (pdata->phy_dev)
 		phy_stop(pdata->phy_dev);
 	else
 		cancel_delayed_work_sync(&pdata->link_work);
@@ -1295,6 +1295,23 @@ static int xgene_enet_get_irqs(struct xgene_enet_pdata *pdata)
 	return 0;
 }
 
+static int xgene_enet_check_phy_handle(struct xgene_enet_pdata *pdata)
+{
+	int ret;
+
+	if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII)
+		return 0;
+
+	if (!IS_ENABLED(CONFIG_MDIO_XGENE))
+		return 0;
+
+	ret = xgene_enet_phy_connect(pdata->ndev);
+	if (!ret)
+		pdata->mdio_driver = true;
+
+	return 0;
+}
+
 static int xgene_enet_get_resources(struct xgene_enet_pdata *pdata)
 {
 	struct platform_device *pdev;
@@ -1380,6 +1397,10 @@ static int xgene_enet_get_resources(struct xgene_enet_pdata *pdata)
 	if (ret)
 		return ret;
 
+	ret = xgene_enet_check_phy_handle(pdata);
+	if (ret)
+		return ret;
+
 	pdata->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(pdata->clk)) {
 		/* Firmware may have set up the clock already. */
@@ -1574,7 +1595,7 @@ static int xgene_enet_probe(struct platform_device *pdev)
 	struct net_device *ndev;
 	struct xgene_enet_pdata *pdata;
 	struct device *dev = &pdev->dev;
-	const struct xgene_mac_ops *mac_ops;
+	void (*link_state)(struct work_struct *);
 	const struct of_device_id *of_id;
 	int ret;
 
@@ -1636,14 +1657,17 @@ static int xgene_enet_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_netdev;
 
-	mac_ops = pdata->mac_ops;
-	if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII) {
-		ret = xgene_enet_mdio_config(pdata);
-		if (ret)
-			goto err_netdev;
-	} else {
-		INIT_DELAYED_WORK(&pdata->link_work, mac_ops->link_state);
+	link_state = pdata->mac_ops->link_state;
+	if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) {
+		INIT_DELAYED_WORK(&pdata->link_work, link_state);
+	} else if (!pdata->mdio_driver) {
+		if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII)
+			ret = xgene_enet_mdio_config(pdata);
+		else
+			INIT_DELAYED_WORK(&pdata->link_work, link_state);
 	}
+	if (ret)
+		goto err;
 
 	xgene_enet_napi_add(pdata);
 	ret = register_netdev(ndev);
@@ -1676,11 +1700,11 @@ static int xgene_enet_remove(struct platform_device *pdev)
 		dev_close(ndev);
 	rtnl_unlock();
 
-	mac_ops->rx_disable(pdata);
-	mac_ops->tx_disable(pdata);
-
-	if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII)
+	if (pdata->mdio_driver)
+		xgene_enet_phy_disconnect(pdata);
+	else if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII)
 		xgene_enet_mdio_remove(pdata);
+
 	unregister_netdev(ndev);
 	pdata->port_ops->shutdown(pdata);
 	xgene_enet_delete_desc_rings(pdata);

drivers/net/ethernet/apm/xgene/xgene_enet_main.h

@@ -38,6 +38,7 @@
 #include "xgene_enet_hw.h"
 #include "xgene_enet_cle.h"
 #include "xgene_enet_ring2.h"
+#include "../../../phy/mdio-xgene.h"
 
 #define XGENE_DRV_VERSION	"v1.0"
 #define XGENE_ENET_MAX_MTU	1536
@@ -214,6 +215,7 @@ struct xgene_enet_pdata {
 	u32 mss;
 	u8 tx_delay;
 	u8 rx_delay;
+	bool mdio_driver;
 };
 
 struct xgene_indirect_ctl {
@@ -223,34 +225,6 @@ struct xgene_indirect_ctl {
 	void __iomem *cmd_done;
 };
 
-/* Set the specified value into a bit-field defined by its starting position
- * and length within a single u64.
- */
-static inline u64 xgene_enet_set_field_value(int pos, int len, u64 val)
-{
-	return (val & ((1ULL << len) - 1)) << pos;
-}
-
-#define SET_VAL(field, val) \
-		xgene_enet_set_field_value(field ## _POS, field ## _LEN, val)
-
-#define SET_BIT(field) \
-		xgene_enet_set_field_value(field ## _POS, 1, 1)
-
-/* Get the value from a bit-field defined by its starting position
- * and length within the specified u64.
- */
-static inline u64 xgene_enet_get_field_value(int pos, int len, u64 src)
-{
-	return (src >> pos) & ((1ULL << len) - 1);
-}
-
-#define GET_VAL(field, src) \
-		xgene_enet_get_field_value(field ## _POS, field ## _LEN, src)
-
-#define GET_BIT(field, src) \
-		xgene_enet_get_field_value(field ## _POS, 1, src)
-
 static inline struct device *ndev_to_dev(struct net_device *ndev)
 {
 	return ndev->dev.parent;

drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c

@@ -366,7 +366,9 @@ static void xgene_sgmac_init(struct xgene_enet_pdata *p)
 	u32 cfg_bypass_reg, rx_dv_gate_reg;
 	u32 data, offset;
 
-	xgene_sgmac_reset(p);
+	if (!(p->enet_id == XGENE_ENET2 && p->mdio_driver))
+		xgene_sgmac_reset(p);
+
 	xgene_sgmii_enable_autoneg(p);
 	xgene_sgmac_set_speed(p);
 	xgene_sgmac_set_mac_addr(p);
@@ -445,6 +447,11 @@ static int xgene_enet_reset(struct xgene_enet_pdata *p)
 	if (!xgene_ring_mgr_init(p))
 		return -ENODEV;
 
+	if (p->mdio_driver && p->enet_id == XGENE_ENET2) {
+		xgene_enet_config_ring_if_assoc(p);
+		return 0;
+	}
+
 	if (p->enet_id == XGENE_ENET2)
 		xgene_enet_wr_clkrst_csr(p, XGENET_CONFIG_REG_ADDR, SGMII_EN);