netdev - [PATCH net-next v2 04/11] net: stmmac: mdio: move stmmac_mdio_format

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Message-Id: <E1uu8o7-00000001vom-1pN8@rmk-PC.armlinux.org.uk>
Date: Thu, 04 Sep 2025 13:11:15 +0100
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-stm32@...md-mailman.stormreply.com,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net-next v2 04/11] net: stmmac: mdio: move
 stmmac_mdio_format_addr() into read/write

Move stmmac_mdio_format_addr() into stmmac_mdio_read() and
stmmac_mdio_write().

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 .../net/ethernet/stmicro/stmmac/stmmac_mdio.c | 46 ++++++++++---------
 1 file changed, 25 insertions(+), 21 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index 4294262c208d..d588475b4279 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -240,16 +240,20 @@ static u32 stmmac_mdio_format_addr(struct stmmac_priv *priv,
 	       MII_BUSY;
 }
 
-static int stmmac_mdio_read(struct stmmac_priv *priv, int data, u32 value)
+static int stmmac_mdio_read(struct stmmac_priv *priv, unsigned int pa,
+			    unsigned int gr, u32 cmd, int data)
 {
 	unsigned int mii_address = priv->hw->mii.addr;
 	unsigned int mii_data = priv->hw->mii.data;
+	u32 value;
 	int ret;
 
 	ret = stmmac_mdio_wait(priv->ioaddr + mii_address, MII_BUSY);
 	if (ret)
 		return ret;
 
+	value = stmmac_mdio_format_addr(priv, pa, gr) | cmd;
+
 	writel(data, priv->ioaddr + mii_data);
 	writel(value, priv->ioaddr + mii_address);
 
@@ -275,17 +279,18 @@ static int stmmac_mdio_read_c22(struct mii_bus *bus, int phyaddr, int phyreg)
 {
 	struct stmmac_priv *priv = netdev_priv(bus->priv);
 	int data = 0;
-	u32 value;
+	u32 cmd;
 
 	data = pm_runtime_resume_and_get(priv->device);
 	if (data < 0)
 		return data;
 
-	value = stmmac_mdio_format_addr(priv, phyaddr, phyreg);
 	if (priv->plat->has_gmac4)
-		value |= MII_GMAC4_READ;
+		cmd = MII_GMAC4_READ;
+	else
+		cmd = 0;
 
-	data = stmmac_mdio_read(priv, data, value);
+	data = stmmac_mdio_read(priv, phyaddr, phyreg, cmd, data);
 
 	pm_runtime_put(priv->device);
 
@@ -308,29 +313,29 @@ static int stmmac_mdio_read_c45(struct mii_bus *bus, int phyaddr, int devad,
 {
 	struct stmmac_priv *priv = netdev_priv(bus->priv);
 	int data = 0;
-	u32 value;
+	u32 cmd;
 
 	data = pm_runtime_resume_and_get(priv->device);
 	if (data < 0)
 		return data;
 
-	value = stmmac_mdio_format_addr(priv, phyaddr, devad);
-	value |= MII_GMAC4_READ;
-	value |= MII_GMAC4_C45E;
+	cmd = MII_GMAC4_READ | MII_GMAC4_C45E;
 
 	data |= phyreg << MII_GMAC4_REG_ADDR_SHIFT;
 
-	data = stmmac_mdio_read(priv, data, value);
+	data = stmmac_mdio_read(priv, phyaddr, devad, cmd, data);
 
 	pm_runtime_put(priv->device);
 
 	return data;
 }
 
-static int stmmac_mdio_write(struct stmmac_priv *priv, int data, u32 value)
+static int stmmac_mdio_write(struct stmmac_priv *priv, unsigned int pa,
+			     unsigned int gr, u32 cmd, int data)
 {
 	unsigned int mii_address = priv->hw->mii.addr;
 	unsigned int mii_data = priv->hw->mii.data;
+	u32 value;
 	int ret;
 
 	/* Wait until any existing MII operation is complete */
@@ -338,6 +343,8 @@ static int stmmac_mdio_write(struct stmmac_priv *priv, int data, u32 value)
 	if (ret)
 		return ret;
 
+	value = stmmac_mdio_format_addr(priv, pa, gr) | cmd;
+
 	/* Set the MII address register to write */
 	writel(data, priv->ioaddr + mii_data);
 	writel(value, priv->ioaddr + mii_address);
@@ -359,19 +366,18 @@ static int stmmac_mdio_write_c22(struct mii_bus *bus, int phyaddr, int phyreg,
 {
 	struct stmmac_priv *priv = netdev_priv(bus->priv);
 	int ret, data = phydata;
-	u32 value;
+	u32 cmd;
 
 	ret = pm_runtime_resume_and_get(priv->device);
 	if (ret < 0)
 		return ret;
 
-	value = stmmac_mdio_format_addr(priv, phyaddr, phyreg);
 	if (priv->plat->has_gmac4)
-		value |= MII_GMAC4_WRITE;
+		cmd = MII_GMAC4_WRITE;
 	else
-		value |= MII_WRITE;
+		cmd = MII_WRITE;
 
-	ret = stmmac_mdio_write(priv, data, value);
+	ret = stmmac_mdio_write(priv, phyaddr, phyreg, cmd, data);
 
 	pm_runtime_put(priv->device);
 
@@ -392,19 +398,17 @@ static int stmmac_mdio_write_c45(struct mii_bus *bus, int phyaddr,
 {
 	struct stmmac_priv *priv = netdev_priv(bus->priv);
 	int ret, data = phydata;
-	u32 value;
+	u32 cmd;
 
 	ret = pm_runtime_resume_and_get(priv->device);
 	if (ret < 0)
 		return ret;
 
-	value = stmmac_mdio_format_addr(priv, phyaddr, devad);
-	value |= MII_GMAC4_WRITE;
-	value |= MII_GMAC4_C45E;
+	cmd = MII_GMAC4_WRITE | MII_GMAC4_C45E;
 
 	data |= phyreg << MII_GMAC4_REG_ADDR_SHIFT;
 
-	ret = stmmac_mdio_write(priv, data, value);
+	ret = stmmac_mdio_write(priv, phyaddr, devad, cmd, data);
 
 	pm_runtime_put(priv->device);
 
-- 
2.47.2