net: mdio: ipq4019: Separate C22 and C45 transactions

The ipq4019 driver can perform both C22 and C45 transfers.  Create
separate functions for each and register the C45 versions using the
new driver API calls.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 90 insertions, 64 deletions

diff --git a/drivers/net/mdio/mdio-ipq4019.c b/drivers/net/mdio/mdio-ipq4019.c
index 4eba5a91075c..78b93de636f5 100644
--- a/drivers/net/mdio/mdio-ipq4019.c
+++ b/drivers/net/mdio/mdio-ipq4019.c
@@ -53,7 +53,8 @@ static int ipq4019_mdio_wait_busy(struct mii_bus *bus)
 				  IPQ4019_MDIO_SLEEP, IPQ4019_MDIO_TIMEOUT);
 }
 
-static int ipq4019_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
+static int ipq4019_mdio_read_c45(struct mii_bus *bus, int mii_id, int mmd,
+				 int reg)
 {
 	struct ipq4019_mdio_data *priv = bus->priv;
 	unsigned int data;
@@ -62,61 +63,71 @@ static int ipq4019_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
 	if (ipq4019_mdio_wait_busy(bus))
 		return -ETIMEDOUT;
 
-	/* Clause 45 support */
-	if (regnum & MII_ADDR_C45) {
-		unsigned int mmd = (regnum >> 16) & 0x1F;
-		unsigned int reg = regnum & 0xFFFF;
+	data = readl(priv->membase + MDIO_MODE_REG);
 
-		/* Enter Clause 45 mode */
-		data = readl(priv->membase + MDIO_MODE_REG);
+	data |= MDIO_MODE_C45;
 
-		data |= MDIO_MODE_C45;
+	writel(data, priv->membase + MDIO_MODE_REG);
 
-		writel(data, priv->membase + MDIO_MODE_REG);
+	/* issue the phy address and mmd */
+	writel((mii_id << 8) | mmd, priv->membase + MDIO_ADDR_REG);
 
-		/* issue the phy address and mmd */
-		writel((mii_id << 8) | mmd, priv->membase + MDIO_ADDR_REG);
+	/* issue reg */
+	writel(reg, priv->membase + MDIO_DATA_WRITE_REG);
 
-		/* issue reg */
-		writel(reg, priv->membase + MDIO_DATA_WRITE_REG);
+	cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_ADDR;
 
-		cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_ADDR;
-	} else {
-		/* Enter Clause 22 mode */
-		data = readl(priv->membase + MDIO_MODE_REG);
+	/* issue read command */
+	writel(cmd, priv->membase + MDIO_CMD_REG);
 
-		data &= ~MDIO_MODE_C45;
+	/* Wait read complete */
+	if (ipq4019_mdio_wait_busy(bus))
+		return -ETIMEDOUT;
 
-		writel(data, priv->membase + MDIO_MODE_REG);
+	cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_READ;
 
-		/* issue the phy address and reg */
-		writel((mii_id << 8) | regnum, priv->membase + MDIO_ADDR_REG);
+	writel(cmd, priv->membase + MDIO_CMD_REG);
 
-		cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_READ;
-	}
+	if (ipq4019_mdio_wait_busy(bus))
+		return -ETIMEDOUT;
 
-	/* issue read command */
-	writel(cmd, priv->membase + MDIO_CMD_REG);
+	/* Read and return data */
+	return readl(priv->membase + MDIO_DATA_READ_REG);
+}
+
+static int ipq4019_mdio_read_c22(struct mii_bus *bus, int mii_id, int regnum)
+{
+	struct ipq4019_mdio_data *priv = bus->priv;
+	unsigned int data;
+	unsigned int cmd;
 
-	/* Wait read complete */
 	if (ipq4019_mdio_wait_busy(bus))
 		return -ETIMEDOUT;
 
-	if (regnum & MII_ADDR_C45) {
-		cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_READ;
+	data = readl(priv->membase + MDIO_MODE_REG);
 
-		writel(cmd, priv->membase + MDIO_CMD_REG);
+	data &= ~MDIO_MODE_C45;
 
-		if (ipq4019_mdio_wait_busy(bus))
-			return -ETIMEDOUT;
-	}
+	writel(data, priv->membase + MDIO_MODE_REG);
+
+	/* issue the phy address and reg */
+	writel((mii_id << 8) | regnum, priv->membase + MDIO_ADDR_REG);
+
+	cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_READ;
+
+	/* issue read command */
+	writel(cmd, priv->membase + MDIO_CMD_REG);
+
+	/* Wait read complete */
+	if (ipq4019_mdio_wait_busy(bus))
+		return -ETIMEDOUT;
 
 	/* Read and return data */
 	return readl(priv->membase + MDIO_DATA_READ_REG);
 }
 
-static int ipq4019_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
-							 u16 value)
+static int ipq4019_mdio_write_c45(struct mii_bus *bus, int mii_id, int mmd,
+				  int reg, u16 value)
 {
 	struct ipq4019_mdio_data *priv = bus->priv;
 	unsigned int data;
@@ -125,50 +136,63 @@ static int ipq4019_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
 	if (ipq4019_mdio_wait_busy(bus))
 		return -ETIMEDOUT;
 
-	/* Clause 45 support */
-	if (regnum & MII_ADDR_C45) {
-		unsigned int mmd = (regnum >> 16) & 0x1F;
-		unsigned int reg = regnum & 0xFFFF;
+	data = readl(priv->membase + MDIO_MODE_REG);
 
-		/* Enter Clause 45 mode */
-		data = readl(priv->membase + MDIO_MODE_REG);
+	data |= MDIO_MODE_C45;
 
-		data |= MDIO_MODE_C45;
+	writel(data, priv->membase + MDIO_MODE_REG);
 
-		writel(data, priv->membase + MDIO_MODE_REG);
+	/* issue the phy address and mmd */
+	writel((mii_id << 8) | mmd, priv->membase + MDIO_ADDR_REG);
 
-		/* issue the phy address and mmd */
-		writel((mii_id << 8) | mmd, priv->membase + MDIO_ADDR_REG);
+	/* issue reg */
+	writel(reg, priv->membase + MDIO_DATA_WRITE_REG);
 
-		/* issue reg */
-		writel(reg, priv->membase + MDIO_DATA_WRITE_REG);
+	cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_ADDR;
 
-		cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_ADDR;
+	writel(cmd, priv->membase + MDIO_CMD_REG);
 
-		writel(cmd, priv->membase + MDIO_CMD_REG);
+	if (ipq4019_mdio_wait_busy(bus))
+		return -ETIMEDOUT;
 
-		if (ipq4019_mdio_wait_busy(bus))
-			return -ETIMEDOUT;
-	} else {
-		/* Enter Clause 22 mode */
-		data = readl(priv->membase + MDIO_MODE_REG);
+	/* issue write data */
+	writel(value, priv->membase + MDIO_DATA_WRITE_REG);
 
-		data &= ~MDIO_MODE_C45;
+	cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_WRITE;
+	writel(cmd, priv->membase + MDIO_CMD_REG);
 
-		writel(data, priv->membase + MDIO_MODE_REG);
+	/* Wait write complete */
+	if (ipq4019_mdio_wait_busy(bus))
+		return -ETIMEDOUT;
 
-		/* issue the phy address and reg */
-		writel((mii_id << 8) | regnum, priv->membase + MDIO_ADDR_REG);
-	}
+	return 0;
+}
+
+static int ipq4019_mdio_write_c22(struct mii_bus *bus, int mii_id, int regnum,
+				  u16 value)
+{
+	struct ipq4019_mdio_data *priv = bus->priv;
+	unsigned int data;
+	unsigned int cmd;
+
+	if (ipq4019_mdio_wait_busy(bus))
+		return -ETIMEDOUT;
+
+	/* Enter Clause 22 mode */
+	data = readl(priv->membase + MDIO_MODE_REG);
+
+	data &= ~MDIO_MODE_C45;
+
+	writel(data, priv->membase + MDIO_MODE_REG);
+
+	/* issue the phy address and reg */
+	writel((mii_id << 8) | regnum, priv->membase + MDIO_ADDR_REG);
 
 	/* issue write data */
 	writel(value, priv->membase + MDIO_DATA_WRITE_REG);
 
 	/* issue write command */
-	if (regnum & MII_ADDR_C45)
-		cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_WRITE;
-	else
-		cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_WRITE;
+	cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_WRITE;
 
 	writel(cmd, priv->membase + MDIO_CMD_REG);
 
@@ -235,8 +259,10 @@ static int ipq4019_mdio_probe(struct platform_device *pdev)
 		priv->eth_ldo_rdy = devm_ioremap_resource(&pdev->dev, res);
 
 	bus->name = "ipq4019_mdio";
-	bus->read = ipq4019_mdio_read;
-	bus->write = ipq4019_mdio_write;
+	bus->read = ipq4019_mdio_read_c22;
+	bus->write = ipq4019_mdio_write_c22;
+	bus->read_c45 = ipq4019_mdio_read_c45;
+	bus->write_c45 = ipq4019_mdio_write_c45;
 	bus->reset = ipq_mdio_reset;
 	bus->parent = &pdev->dev;
 	snprintf(bus->id, MII_BUS_ID_SIZE, "%s%d", pdev->name, pdev->id);