1 files changed, 268 insertions, 0 deletions
diff --git a/drivers/net/ethernet/hisilicon/hibmcge/hbg_mdio.c b/drivers/net/ethernet/hisilicon/hibmcge/hbg_mdio.c
new file mode 100644
index 000000000000..42b0083c9193
--- /dev/null
+++ b/drivers/net/ethernet/hisilicon/hibmcge/hbg_mdio.c
@@ -0,0 +1,268 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright (c) 2024 Hisilicon Limited.
+
+#include <linux/phy.h>
+#include <linux/rtnetlink.h>
+#include "hbg_common.h"
+#include "hbg_hw.h"
+#include "hbg_mdio.h"
+#include "hbg_reg.h"
+
+#define HBG_MAC_GET_PRIV(mac) ((struct hbg_priv *)(mac)->mdio_bus->priv)
+#define HBG_MII_BUS_GET_MAC(bus) (&((struct hbg_priv *)(bus)->priv)->mac)
+
+#define HBG_MDIO_C22_MODE		0x1
+#define HBG_MDIO_C22_REG_WRITE		0x1
+#define HBG_MDIO_C22_REG_READ		0x2
+
+#define HBG_MDIO_OP_TIMEOUT_US		(1 * 1000 * 1000)
+#define HBG_MDIO_OP_INTERVAL_US		(5 * 1000)
+
+#define HBG_NP_LINK_FAIL_RETRY_TIMES	5
+
+static void hbg_mdio_set_command(struct hbg_mac *mac, u32 cmd)
+{
+	hbg_reg_write(HBG_MAC_GET_PRIV(mac), HBG_REG_MDIO_COMMAND_ADDR, cmd);
+}
+
+static void hbg_mdio_get_command(struct hbg_mac *mac, u32 *cmd)
+{
+	*cmd = hbg_reg_read(HBG_MAC_GET_PRIV(mac), HBG_REG_MDIO_COMMAND_ADDR);
+}
+
+static void hbg_mdio_set_wdata_reg(struct hbg_mac *mac, u16 wdata_value)
+{
+	hbg_reg_write_field(HBG_MAC_GET_PRIV(mac), HBG_REG_MDIO_WDATA_ADDR,
+			    HBG_REG_MDIO_WDATA_M, wdata_value);
+}
+
+static u32 hbg_mdio_get_rdata_reg(struct hbg_mac *mac)
+{
+	return hbg_reg_read_field(HBG_MAC_GET_PRIV(mac),
+				  HBG_REG_MDIO_RDATA_ADDR,
+				  HBG_REG_MDIO_WDATA_M);
+}
+
+static int hbg_mdio_wait_ready(struct hbg_mac *mac)
+{
+	struct hbg_priv *priv = HBG_MAC_GET_PRIV(mac);
+	u32 cmd = 0;
+	int ret;
+
+	ret = readl_poll_timeout(priv->io_base + HBG_REG_MDIO_COMMAND_ADDR, cmd,
+				 !FIELD_GET(HBG_REG_MDIO_COMMAND_START_B, cmd),
+				 HBG_MDIO_OP_INTERVAL_US,
+				 HBG_MDIO_OP_TIMEOUT_US);
+
+	return ret ? -ETIMEDOUT : 0;
+}
+
+static int hbg_mdio_cmd_send(struct hbg_mac *mac, u32 prt_addr, u32 dev_addr,
+			     u32 type, u32 op_code)
+{
+	u32 cmd = 0;
+
+	hbg_mdio_get_command(mac, &cmd);
+	hbg_field_modify(cmd, HBG_REG_MDIO_COMMAND_ST_M, type);
+	hbg_field_modify(cmd, HBG_REG_MDIO_COMMAND_OP_M, op_code);
+	hbg_field_modify(cmd, HBG_REG_MDIO_COMMAND_PRTAD_M, prt_addr);
+	hbg_field_modify(cmd, HBG_REG_MDIO_COMMAND_DEVAD_M, dev_addr);
+
+	/* if auto scan enabled, this value need fix to 0 */
+	hbg_field_modify(cmd, HBG_REG_MDIO_COMMAND_START_B, 0x1);
+
+	hbg_mdio_set_command(mac, cmd);
+
+	/* wait operation complete and check the result */
+	return hbg_mdio_wait_ready(mac);
+}
+
+static int hbg_mdio_read22(struct mii_bus *bus, int phy_addr, int regnum)
+{
+	struct hbg_mac *mac = HBG_MII_BUS_GET_MAC(bus);
+	int ret;
+
+	ret = hbg_mdio_cmd_send(mac, phy_addr, regnum, HBG_MDIO_C22_MODE,
+				HBG_MDIO_C22_REG_READ);
+	if (ret)
+		return ret;
+
+	return hbg_mdio_get_rdata_reg(mac);
+}
+
+static int hbg_mdio_write22(struct mii_bus *bus, int phy_addr, int regnum,
+			    u16 val)
+{
+	struct hbg_mac *mac = HBG_MII_BUS_GET_MAC(bus);
+
+	hbg_mdio_set_wdata_reg(mac, val);
+	return hbg_mdio_cmd_send(mac, phy_addr, regnum, HBG_MDIO_C22_MODE,
+				 HBG_MDIO_C22_REG_WRITE);
+}
+
+static void hbg_mdio_init_hw(struct hbg_priv *priv)
+{
+	u32 freq = priv->dev_specs.mdio_frequency;
+	struct hbg_mac *mac = &priv->mac;
+	u32 cmd = 0;
+
+	cmd |= FIELD_PREP(HBG_REG_MDIO_COMMAND_ST_M, HBG_MDIO_C22_MODE);
+	cmd |= FIELD_PREP(HBG_REG_MDIO_COMMAND_AUTO_SCAN_B, HBG_STATUS_DISABLE);
+
+	/* freq use two bits, which are stored in clk_sel and clk_sel_exp */
+	cmd |= FIELD_PREP(HBG_REG_MDIO_COMMAND_CLK_SEL_B, freq & 0x1);
+	cmd |= FIELD_PREP(HBG_REG_MDIO_COMMAND_CLK_SEL_EXP_B,
+			  (freq >> 1) & 0x1);
+
+	hbg_mdio_set_command(mac, cmd);
+}
+
+static void hbg_flowctrl_cfg(struct hbg_priv *priv)
+{
+	struct phy_device *phydev = priv->mac.phydev;
+	bool rx_pause;
+	bool tx_pause;
+
+	if (!priv->mac.pause_autoneg)
+		return;
+
+	phy_get_pause(phydev, &tx_pause, &rx_pause);
+	hbg_hw_set_pause_enable(priv, tx_pause, rx_pause);
+}
+
+void hbg_fix_np_link_fail(struct hbg_priv *priv)
+{
+	struct device *dev = &priv->pdev->dev;
+
+	rtnl_lock();
+
+	if (priv->stats.np_link_fail_cnt >= HBG_NP_LINK_FAIL_RETRY_TIMES) {
+		dev_err(dev, "failed to fix the MAC link status\n");
+		priv->stats.np_link_fail_cnt = 0;
+		goto unlock;
+	}
+
+	if (!priv->mac.phydev->link)
+		goto unlock;
+
+	priv->stats.np_link_fail_cnt++;
+	dev_err(dev, "failed to link between MAC and PHY, try to fix...\n");
+
+	/* Replace phy_reset() with phy_stop() and phy_start(),
+	 * as suggested by Andrew.
+	 */
+	hbg_phy_stop(priv);
+	hbg_phy_start(priv);
+
+unlock:
+	rtnl_unlock();
+}
+
+static void hbg_phy_adjust_link(struct net_device *netdev)
+{
+	struct hbg_priv *priv = netdev_priv(netdev);
+	struct phy_device *phydev = netdev->phydev;
+	u32 speed;
+
+	if (phydev->link != priv->mac.link_status) {
+		if (phydev->link) {
+			switch (phydev->speed) {
+			case SPEED_10:
+				speed = HBG_PORT_MODE_SGMII_10M;
+				break;
+			case SPEED_100:
+				speed = HBG_PORT_MODE_SGMII_100M;
+				break;
+			case SPEED_1000:
+				speed = HBG_PORT_MODE_SGMII_1000M;
+				break;
+			default:
+				return;
+			}
+
+			priv->mac.speed = speed;
+			priv->mac.duplex = phydev->duplex;
+			priv->mac.autoneg = phydev->autoneg;
+			hbg_hw_adjust_link(priv, speed, phydev->duplex);
+			hbg_flowctrl_cfg(priv);
+		}
+
+		priv->mac.link_status = phydev->link;
+		phy_print_status(phydev);
+	}
+}
+
+static void hbg_phy_disconnect(void *data)
+{
+	phy_disconnect((struct phy_device *)data);
+}
+
+static int hbg_phy_connect(struct hbg_priv *priv)
+{
+	struct phy_device *phydev = priv->mac.phydev;
+	struct device *dev = &priv->pdev->dev;
+	int ret;
+
+	ret = phy_connect_direct(priv->netdev, phydev, hbg_phy_adjust_link,
+				 PHY_INTERFACE_MODE_SGMII);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to connect phy\n");
+
+	ret = devm_add_action_or_reset(dev, hbg_phy_disconnect, phydev);
+	if (ret)
+		return ret;
+
+	phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_1000baseT_Half_BIT);
+	phy_support_asym_pause(phydev);
+	phy_attached_info(phydev);
+
+	return 0;
+}
+
+void hbg_phy_start(struct hbg_priv *priv)
+{
+	phy_start(priv->mac.phydev);
+}
+
+void hbg_phy_stop(struct hbg_priv *priv)
+{
+	phy_stop(priv->mac.phydev);
+}
+
+int hbg_mdio_init(struct hbg_priv *priv)
+{
+	struct device *dev = &priv->pdev->dev;
+	struct hbg_mac *mac = &priv->mac;
+	struct phy_device *phydev;
+	struct mii_bus *mdio_bus;
+	int ret;
+
+	mac->phy_addr = priv->dev_specs.phy_addr;
+	mdio_bus = devm_mdiobus_alloc(dev);
+	if (!mdio_bus)
+		return dev_err_probe(dev, -ENOMEM,
+				     "failed to alloc MDIO bus\n");
+
+	mdio_bus->parent = dev;
+	mdio_bus->priv = priv;
+	mdio_bus->phy_mask = ~(1 << mac->phy_addr);
+	mdio_bus->name = "hibmcge mii bus";
+	mac->mdio_bus = mdio_bus;
+
+	mdio_bus->read = hbg_mdio_read22;
+	mdio_bus->write = hbg_mdio_write22;
+	snprintf(mdio_bus->id, MII_BUS_ID_SIZE, "%s-%s", "mii", dev_name(dev));
+
+	ret = devm_mdiobus_register(dev, mdio_bus);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to register MDIO bus\n");
+
+	phydev = mdiobus_get_phy(mdio_bus, mac->phy_addr);
+	if (!phydev)
+		return dev_err_probe(dev, -ENODEV,
+				     "failed to get phy device\n");
+
+	mac->phydev = phydev;
+	hbg_mdio_init_hw(priv);
+	return hbg_phy_connect(priv);
+}