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Message-Id: <20240501230552.53185-6-fujita.tomonori@gmail.com>
Date: Thu,  2 May 2024 08:05:51 +0900
From: FUJITA Tomonori <fujita.tomonori@...il.com>
To: netdev@...r.kernel.org
Cc: andrew@...n.ch,
	kuba@...nel.org,
	jiri@...nulli.us,
	horms@...nel.org
Subject: [PATCH net-next v4 5/6] net: tn40xx: add mdio bus support

This patch adds supports for mdio bus. A later path adds PHYLIB
support on the top of this.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@...il.com>
---
 drivers/net/ethernet/tehuti/Makefile    |   2 +-
 drivers/net/ethernet/tehuti/tn40.c      |   6 ++
 drivers/net/ethernet/tehuti/tn40.h      |   3 +
 drivers/net/ethernet/tehuti/tn40_mdio.c | 134 ++++++++++++++++++++++++
 4 files changed, 144 insertions(+), 1 deletion(-)
 create mode 100644 drivers/net/ethernet/tehuti/tn40_mdio.c

diff --git a/drivers/net/ethernet/tehuti/Makefile b/drivers/net/ethernet/tehuti/Makefile
index 1c468d99e476..7a0fe586a243 100644
--- a/drivers/net/ethernet/tehuti/Makefile
+++ b/drivers/net/ethernet/tehuti/Makefile
@@ -5,5 +5,5 @@
 
 obj-$(CONFIG_TEHUTI) += tehuti.o
 
-tn40xx-y := tn40.o
+tn40xx-y := tn40.o tn40_mdio.o
 obj-$(CONFIG_TEHUTI_TN40) += tn40xx.o
diff --git a/drivers/net/ethernet/tehuti/tn40.c b/drivers/net/ethernet/tehuti/tn40.c
index 6f9c5fc88d45..db1f781b8063 100644
--- a/drivers/net/ethernet/tehuti/tn40.c
+++ b/drivers/net/ethernet/tehuti/tn40.c
@@ -1776,6 +1776,12 @@ static int tn40_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		goto err_unset_drvdata;
 	}
 
+	ret = tn40_mdiobus_init(priv);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to initialize mdio bus.\n");
+		goto err_free_irq;
+	}
+
 	priv->stats_flag =
 		((tn40_read_reg(priv, TN40_FPGA_VER) & 0xFFF) != 308);
 
diff --git a/drivers/net/ethernet/tehuti/tn40.h b/drivers/net/ethernet/tehuti/tn40.h
index cbb7b80c66b1..ce991041caf9 100644
--- a/drivers/net/ethernet/tehuti/tn40.h
+++ b/drivers/net/ethernet/tehuti/tn40.h
@@ -160,6 +160,7 @@ struct tn40_priv {
 	char *b0_va; /* Virtual address of buffer */
 
 	struct tn40_rx_page_table rx_page_table;
+	struct mii_bus *mdio;
 };
 
 /* RX FREE descriptor - 64bit */
@@ -246,4 +247,6 @@ static inline void tn40_write_reg(struct tn40_priv *priv, u32 reg, u32 val)
 	writel(val, priv->regs + reg);
 }
 
+int tn40_mdiobus_init(struct tn40_priv *priv);
+
 #endif /* _TN40XX_H */
diff --git a/drivers/net/ethernet/tehuti/tn40_mdio.c b/drivers/net/ethernet/tehuti/tn40_mdio.c
new file mode 100644
index 000000000000..64ef7f40f25d
--- /dev/null
+++ b/drivers/net/ethernet/tehuti/tn40_mdio.c
@@ -0,0 +1,134 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* Copyright (c) Tehuti Networks Ltd. */
+
+#include <linux/netdevice.h>
+#include <linux/pci.h>
+#include <linux/phylink.h>
+
+#include "tn40.h"
+
+static void tn40_mdio_set_speed(struct tn40_priv *priv, u32 speed)
+{
+	void __iomem *regs = priv->regs;
+	int mdio_cfg;
+
+	mdio_cfg = readl(regs + TN40_REG_MDIO_CMD_STAT);
+	if (speed == 1)
+		mdio_cfg = (0x7d << 7) | 0x08;	/* 1MHz */
+	else
+		mdio_cfg = 0xA08;	/* 6MHz */
+	mdio_cfg |= (1 << 6);
+	writel(mdio_cfg, regs + TN40_REG_MDIO_CMD_STAT);
+	msleep(100);
+}
+
+static u32 tn40_mdio_stat(struct tn40_priv *priv)
+{
+	void __iomem *regs = priv->regs;
+
+	return readl(regs + TN40_REG_MDIO_CMD_STAT);
+}
+
+static int tn40_mdio_get(struct tn40_priv *priv, u32 *val)
+{
+	u32 stat;
+
+	return readx_poll_timeout_atomic(tn40_mdio_stat, priv, stat,
+					 TN40_GET_MDIO_BUSY(stat) == 0, 10,
+					 10000);
+}
+
+static int tn40_mdio_read(struct tn40_priv *priv, int port, int device,
+			  u16 regnum)
+{
+	void __iomem *regs = priv->regs;
+	u32 tmp_reg, i;
+
+	/* wait until MDIO is not busy */
+	if (tn40_mdio_get(priv, NULL))
+		return -EIO;
+
+	i = ((device & 0x1F) | ((port & 0x1F) << 5));
+	writel(i, regs + TN40_REG_MDIO_CMD);
+	writel((u32)regnum, regs + TN40_REG_MDIO_ADDR);
+	if (tn40_mdio_get(priv, NULL))
+		return -EIO;
+
+	writel(((1 << 15) | i), regs + TN40_REG_MDIO_CMD);
+	/* read CMD_STAT until not busy */
+	if (tn40_mdio_get(priv, NULL))
+		return -EIO;
+
+	tmp_reg = readl(regs + TN40_REG_MDIO_DATA);
+	return lower_16_bits(tmp_reg);
+}
+
+static int tn40_mdio_write(struct tn40_priv *priv, int port, int device,
+			   u16 regnum, u16 data)
+{
+	void __iomem *regs = priv->regs;
+	u32 tmp_reg = 0;
+	int ret;
+
+	/* wait until MDIO is not busy */
+	if (tn40_mdio_get(priv, NULL))
+		return -EIO;
+	writel(((device & 0x1F) | ((port & 0x1F) << 5)),
+	       regs + TN40_REG_MDIO_CMD);
+	writel((u32)regnum, regs + TN40_REG_MDIO_ADDR);
+	if (tn40_mdio_get(priv, NULL))
+		return -EIO;
+	writel((u32)data, regs + TN40_REG_MDIO_DATA);
+	/* read CMD_STAT until not busy */
+	ret = tn40_mdio_get(priv, &tmp_reg);
+	if (ret)
+		return -EIO;
+
+	if (TN40_GET_MDIO_RD_ERR(tmp_reg)) {
+		dev_err(&priv->pdev->dev, "MDIO error after write command\n");
+		return -EIO;
+	}
+	return 0;
+}
+
+static int tn40_mdio_read_cb(struct mii_bus *mii_bus, int addr, int devnum,
+			     int regnum)
+{
+	return tn40_mdio_read(mii_bus->priv, addr, devnum, regnum);
+}
+
+static int tn40_mdio_write_cb(struct mii_bus *mii_bus, int addr, int devnum,
+			      int regnum, u16 val)
+{
+	return  tn40_mdio_write(mii_bus->priv, addr, devnum, regnum, val);
+}
+
+int tn40_mdiobus_init(struct tn40_priv *priv)
+{
+	struct pci_dev *pdev = priv->pdev;
+	struct mii_bus *bus;
+	int ret;
+
+	bus = devm_mdiobus_alloc(&pdev->dev);
+	if (!bus)
+		return -ENOMEM;
+
+	bus->name = TN40_DRV_NAME;
+	bus->parent = &pdev->dev;
+	snprintf(bus->id, MII_BUS_ID_SIZE, "tn40xx-%x-%x",
+		 pci_domain_nr(pdev->bus), pci_dev_id(pdev));
+	bus->priv = priv;
+
+	bus->read_c45 = tn40_mdio_read_cb;
+	bus->write_c45 = tn40_mdio_write_cb;
+
+	ret = devm_mdiobus_register(&pdev->dev, bus);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register mdiobus %d %u %u\n",
+			ret, bus->state, MDIOBUS_UNREGISTERED);
+		return ret;
+	}
+	tn40_mdio_set_speed(priv, TN40_MDIO_SPEED_6MHZ);
+	priv->mdio = bus;
+	return 0;
+}
-- 
2.34.1


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