[PATCH 1/6] net: hisilicon: add support for hisi_femac core on Hi3798MV200

[Yang Xiwen via B4 Relay <devnull+forbidden405.outlook.com@kernel.org>]

From: Yang Xiwen <forbidden405@outlook.com>

Considering that no users is found in the kernel, no backward
compatibility is maintained.

Signed-off-by: Yang Xiwen <forbidden405@outlook.com>
---
 drivers/net/ethernet/hisilicon/hisi_femac.c | 90 ++++++++++++++++++++++-------
 1 file changed, 68 insertions(+), 22 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hisi_femac.c b/drivers/net/ethernet/hisilicon/hisi_femac.c
index 2406263c9dd3..d72160efff9a 100644
--- a/drivers/net/ethernet/hisilicon/hisi_femac.c
+++ b/drivers/net/ethernet/hisilicon/hisi_femac.c
@@ -10,8 +10,10 @@
 #include <linux/etherdevice.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/of_mdio.h>
 #include <linux/of_net.h>
+#include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/reset.h>
 
@@ -97,6 +99,13 @@ enum phy_reset_delays {
 	DELAYS_NUM,
 };
 
+enum clk_type {
+	CLK_MAC,
+	CLK_BUS,
+	CLK_PHY,
+	CLK_NUM,
+};
+
 struct hisi_femac_queue {
 	struct sk_buff **skb;
 	dma_addr_t *dma_phys;
@@ -108,7 +117,7 @@ struct hisi_femac_queue {
 struct hisi_femac_priv {
 	void __iomem *port_base;
 	void __iomem *glb_base;
-	struct clk *clk;
+	struct clk *clks[CLK_NUM];
 	struct reset_control *mac_rst;
 	struct reset_control *phy_rst;
 	u32 phy_reset_delays[DELAYS_NUM];
@@ -116,6 +125,7 @@ struct hisi_femac_priv {
 
 	struct device *dev;
 	struct net_device *ndev;
+	struct platform_device *mdio_pdev;
 
 	struct hisi_femac_queue txq;
 	struct hisi_femac_queue rxq;
@@ -693,6 +703,7 @@ static const struct net_device_ops hisi_femac_netdev_ops = {
 static void hisi_femac_core_reset(struct hisi_femac_priv *priv)
 {
 	reset_control_assert(priv->mac_rst);
+	usleep_range(200, 300);
 	reset_control_deassert(priv->mac_rst);
 }
 
@@ -712,6 +723,10 @@ static void hisi_femac_sleep_us(u32 time_us)
 
 static void hisi_femac_phy_reset(struct hisi_femac_priv *priv)
 {
+	/* MAC clock must be disabled before PHY reset
+	 */
+	clk_disable(priv->clks[CLK_MAC]);
+	clk_disable(priv->clks[CLK_BUS]);
 	/* To make sure PHY hardware reset success,
 	 * we must keep PHY in deassert state first and
 	 * then complete the hardware reset operation
@@ -727,6 +742,9 @@ static void hisi_femac_phy_reset(struct hisi_femac_priv *priv)
 	reset_control_deassert(priv->phy_rst);
 	/* delay some time to ensure later MDIO access */
 	hisi_femac_sleep_us(priv->phy_reset_delays[POST_DELAY]);
+
+	clk_enable(priv->clks[CLK_MAC]);
+	clk_enable(priv->clks[CLK_BUS]);
 }
 
 static void hisi_femac_port_init(struct hisi_femac_priv *priv)
@@ -768,11 +786,17 @@ static void hisi_femac_port_init(struct hisi_femac_priv *priv)
 static int hisi_femac_drv_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct device_node *node = dev->of_node;
+	struct device_node *node = dev->of_node, *mdio_np;
 	struct net_device *ndev;
 	struct hisi_femac_priv *priv;
 	struct phy_device *phy;
-	int ret;
+	int ret, i;
+	bool mdio_registered = false;
+	static const char * const clk_strs[] = {
+		[CLK_MAC] = "mac",
+		[CLK_BUS] = "bus",
+		[CLK_PHY] = "phy",
+	};
 
 	ndev = alloc_etherdev(sizeof(*priv));
 	if (!ndev)
@@ -797,23 +821,20 @@ static int hisi_femac_drv_probe(struct platform_device *pdev)
 		goto out_free_netdev;
 	}
 
-	priv->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(priv->clk)) {
-		dev_err(dev, "failed to get clk\n");
-		ret = -ENODEV;
-		goto out_free_netdev;
-	}
-
-	ret = clk_prepare_enable(priv->clk);
-	if (ret) {
-		dev_err(dev, "failed to enable clk %d\n", ret);
-		goto out_free_netdev;
+	for (i = 0; i < CLK_NUM; i++) {
+		priv->clks[i] = devm_clk_get_enabled(&pdev->dev, clk_strs[i]);
+		if (IS_ERR(priv->clks[i])) {
+			dev_err(dev, "failed to get enabled clk %s: %ld\n", clk_strs[i],
+				PTR_ERR(priv->clks[i]));
+			ret = -ENODEV;
+			goto out_free_netdev;
+		}
 	}
 
 	priv->mac_rst = devm_reset_control_get(dev, "mac");
 	if (IS_ERR(priv->mac_rst)) {
 		ret = PTR_ERR(priv->mac_rst);
-		goto out_disable_clk;
+		goto out_free_netdev;
 	}
 	hisi_femac_core_reset(priv);
 
@@ -826,15 +847,32 @@ static int hisi_femac_drv_probe(struct platform_device *pdev)
 						 priv->phy_reset_delays,
 						 DELAYS_NUM);
 		if (ret)
-			goto out_disable_clk;
+			goto out_free_netdev;
 		hisi_femac_phy_reset(priv);
 	}
 
+	// Register the optional MDIO bus
+	for_each_available_child_of_node(node, mdio_np) {
+		if (of_node_name_prefix(mdio_np, "mdio")) {
+			priv->mdio_pdev = of_platform_device_create(mdio_np, NULL, dev);
+			of_node_put(mdio_np);
+			if (!priv->mdio_pdev) {
+				dev_err(dev, "failed to register MDIO bus device\n");
+				goto out_free_netdev;
+			}
+			mdio_registered = true;
+			break;
+		}
+	}
+
+	if (!mdio_registered)
+		dev_warn(dev, "MDIO subnode notfound. This is usually a bug.\n");
+
 	phy = of_phy_get_and_connect(ndev, node, hisi_femac_adjust_link);
 	if (!phy) {
 		dev_err(dev, "connect to PHY failed!\n");
 		ret = -ENODEV;
-		goto out_disable_clk;
+		goto out_unregister_mdio_bus;
 	}
 
 	phy_attached_print(phy, "phy_id=0x%.8lx, phy_mode=%s\n",
@@ -885,8 +923,8 @@ static int hisi_femac_drv_probe(struct platform_device *pdev)
 out_disconnect_phy:
 	netif_napi_del(&priv->napi);
 	phy_disconnect(phy);
-out_disable_clk:
-	clk_disable_unprepare(priv->clk);
+out_unregister_mdio_bus:
+	platform_device_unregister(priv->mdio_pdev);
 out_free_netdev:
 	free_netdev(ndev);
 
@@ -897,12 +935,15 @@ static void hisi_femac_drv_remove(struct platform_device *pdev)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct hisi_femac_priv *priv = netdev_priv(ndev);
+	int i;
 
 	netif_napi_del(&priv->napi);
 	unregister_netdev(ndev);
 
 	phy_disconnect(ndev->phydev);
-	clk_disable_unprepare(priv->clk);
+	platform_device_unregister(priv->mdio_pdev);
+	for (i = 0; i < CLK_NUM; i++)
+		clk_disable_unprepare(priv->clks[i]);
 	free_netdev(ndev);
 }
 
@@ -912,6 +953,7 @@ static int hisi_femac_drv_suspend(struct platform_device *pdev,
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct hisi_femac_priv *priv = netdev_priv(ndev);
+	int i;
 
 	disable_irq(ndev->irq);
 	if (netif_running(ndev)) {
@@ -919,7 +961,8 @@ static int hisi_femac_drv_suspend(struct platform_device *pdev,
 		netif_device_detach(ndev);
 	}
 
-	clk_disable_unprepare(priv->clk);
+	for (i = 0; i < CLK_NUM; i++)
+		clk_disable_unprepare(priv->clks[i]);
 
 	return 0;
 }
@@ -928,8 +971,10 @@ static int hisi_femac_drv_resume(struct platform_device *pdev)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct hisi_femac_priv *priv = netdev_priv(ndev);
+	int i;
 
-	clk_prepare_enable(priv->clk);
+	for (i = 0; i < CLK_NUM; i++)
+		clk_prepare_enable(priv->clks[i]);
 	if (priv->phy_rst)
 		hisi_femac_phy_reset(priv);
 
@@ -948,6 +993,7 @@ static const struct of_device_id hisi_femac_match[] = {
 	{.compatible = "hisilicon,hisi-femac-v1",},
 	{.compatible = "hisilicon,hisi-femac-v2",},
 	{.compatible = "hisilicon,hi3516cv300-femac",},
+	{.compatible = "hisilicon,hi3798mv200-femac",},
 	{},
 };
 

-- 
2.43.0