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Message-Id: <20240603064955.58327-6-fujita.tomonori@gmail.com>
Date: Mon, 3 Jun 2024 15:49:54 +0900
From: FUJITA Tomonori <fujita.tomonori@...il.com>
To: netdev@...r.kernel.org
Cc: andrew@...n.ch,
horms@...nel.org,
kuba@...nel.org,
jiri@...nulli.us,
pabeni@...hat.com,
linux@...linux.org.uk,
hfdevel@....net,
naveenm@...vell.com,
jdamato@...tly.com
Subject: [PATCH net-next v8 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.h | 4 +
drivers/net/ethernet/tehuti/tn40_mdio.c | 143 ++++++++++++++++++++++++
3 files changed, 148 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.h b/drivers/net/ethernet/tehuti/tn40.h
index afe85ce44d41..05a9adf9fe5a 100644
--- a/drivers/net/ethernet/tehuti/tn40.h
+++ b/drivers/net/ethernet/tehuti/tn40.h
@@ -141,6 +141,8 @@ struct tn40_priv {
u32 b0_len;
dma_addr_t b0_dma; /* Physical address of buffer */
char *b0_va; /* Virtual address of buffer */
+
+ struct mii_bus *mdio;
};
/* RX FREE descriptor - 64bit */
@@ -218,4 +220,6 @@ 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..8a1f0c9f51b2
--- /dev/null
+++ b/drivers/net/ethernet/tehuti/tn40_mdio.c
@@ -0,0 +1,143 @@
+// 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"
+
+#define TN40_MDIO_DEVAD_MASK GENMASK(4, 0)
+#define TN40_MDIO_PRTAD_MASK GENMASK(9, 5)
+#define TN40_MDIO_CMD_VAL(device, port) \
+ (FIELD_PREP(TN40_MDIO_DEVAD_MASK, (device)) | \
+ (FIELD_PREP(TN40_MDIO_PRTAD_MASK, (port))))
+#define TN40_MDIO_CMD_READ BIT(15)
+
+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;
+ int ret;
+
+ ret = readx_poll_timeout_atomic(tn40_mdio_stat, priv, stat,
+ TN40_GET_MDIO_BUSY(stat) == 0, 10,
+ 10000);
+ if (val)
+ *val = stat;
+ return ret;
+}
+
+static int tn40_mdio_read(struct tn40_priv *priv, int port, int device,
+ u16 regnum)
+{
+ void __iomem *regs = priv->regs;
+ u32 i;
+
+ /* wait until MDIO is not busy */
+ if (tn40_mdio_get(priv, NULL))
+ return -EIO;
+
+ i = TN40_MDIO_CMD_VAL(device, port);
+ writel(i, regs + TN40_REG_MDIO_CMD);
+ writel((u32)regnum, regs + TN40_REG_MDIO_ADDR);
+ if (tn40_mdio_get(priv, NULL))
+ return -EIO;
+
+ writel(TN40_MDIO_CMD_READ | i, regs + TN40_REG_MDIO_CMD);
+ /* read CMD_STAT until not busy */
+ if (tn40_mdio_get(priv, NULL))
+ return -EIO;
+
+ return lower_16_bits(readl(regs + TN40_REG_MDIO_DATA));
+}
+
+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(TN40_MDIO_CMD_VAL(device, port), 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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