[PATCH v0 RFC RFT net-next 0/5] Use MMD/C45 helpers

[PATCH v0 RFC RFT net-next 0/5] Use MMD/C45 helpers

[Andrew Lunn]

MDIO busses can perform two sorts of bus transaction, defined in
clause 22 and clause 45 of 802.3. This results in two register
addresses spaces. The current driver structure for indicating if C22
or C45 should be used is messy, and many C22 only bus drivers will
wrongly interpret a C45 transaction as a C22 transaction.

This patchset is a preparation step to cleanup the situation. It
converts MDIO bus users to make use of existing _mmd and _c45 helpers
to perform accesses to C45 registers. This will later allow C45 and
C22 to be kept separate.

I don't have any of this hardware, so request testing where possible.

Andrew Lunn (5):
  net: phylink: Convert to mdiobus_c45_{read|write}
  net: phy: Convert to mdiobus_c45_{read|write}
  net: phy: bcm87xx: Use mmd helpers
  net: dsa: sja1105: Convert to mdiobus_c45_read
  net: pcs: pcs-xpcs: Convert to mdiobus_c45_read

 drivers/net/dsa/sja1105/sja1105_main.c |  5 ++--
 drivers/net/pcs/pcs-xpcs.c             |  6 ++---
 drivers/net/phy/bcm87xx.c              |  5 ++--
 drivers/net/phy/phy.c                  | 18 +++++++++------
 drivers/net/phy/phylink.c              | 32 ++++++++++++++------------
 5 files changed, 34 insertions(+), 32 deletions(-)

-- 
2.35.1

[PATCH v0 RFC RFT net-next 1/5] net: phylink: Convert to mdiobus_c45_{read|write}

[Andrew Lunn]

Stop using the helpers to construct a special phy address which
indicates C45. Instead use the C45 accessors, which will call the
busses C45 specific read/write API.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
---
 drivers/net/phy/phylink.c | 32 +++++++++++++++++---------------
 1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 06943889d747..a743472cb187 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -2301,8 +2301,11 @@ static int phylink_phy_read(struct phylink *pl, unsigned int phy_id,
 	if (mdio_phy_id_is_c45(phy_id)) {
 		prtad = mdio_phy_id_prtad(phy_id);
 		devad = mdio_phy_id_devad(phy_id);
-		devad = mdiobus_c45_addr(devad, reg);
-	} else if (phydev->is_c45) {
+		return mdiobus_c45_read(pl->phydev->mdio.bus, prtad, devad,
+					reg);
+	}
+
+	if (phydev->is_c45) {
 		switch (reg) {
 		case MII_BMCR:
 		case MII_BMSR:
@@ -2324,12 +2327,11 @@ static int phylink_phy_read(struct phylink *pl, unsigned int phy_id,
 			return -EINVAL;
 		}
 		prtad = phy_id;
-		devad = mdiobus_c45_addr(devad, reg);
-	} else {
-		prtad = phy_id;
-		devad = reg;
+		return mdiobus_c45_read(pl->phydev->mdio.bus, prtad, devad,
+					reg);
 	}
-	return mdiobus_read(pl->phydev->mdio.bus, prtad, devad);
+
+	return mdiobus_read(pl->phydev->mdio.bus, phy_id, reg);
 }
 
 static int phylink_phy_write(struct phylink *pl, unsigned int phy_id,
@@ -2341,8 +2343,11 @@ static int phylink_phy_write(struct phylink *pl, unsigned int phy_id,
 	if (mdio_phy_id_is_c45(phy_id)) {
 		prtad = mdio_phy_id_prtad(phy_id);
 		devad = mdio_phy_id_devad(phy_id);
-		devad = mdiobus_c45_addr(devad, reg);
-	} else if (phydev->is_c45) {
+		return mdiobus_c45_write(pl->phydev->mdio.bus, prtad, devad,
+					 reg, val);
+	}
+
+	if (phydev->is_c45) {
 		switch (reg) {
 		case MII_BMCR:
 		case MII_BMSR:
@@ -2363,14 +2368,11 @@ static int phylink_phy_write(struct phylink *pl, unsigned int phy_id,
 		default:
 			return -EINVAL;
 		}
-		prtad = phy_id;
-		devad = mdiobus_c45_addr(devad, reg);
-	} else {
-		prtad = phy_id;
-		devad = reg;
+		return mdiobus_c45_write(pl->phydev->mdio.bus, phy_id, devad,
+					 reg, val);
 	}
 
-	return mdiobus_write(phydev->mdio.bus, prtad, devad, val);
+	return mdiobus_write(phydev->mdio.bus, phy_id, reg, val);
 }
 
 static int phylink_mii_read(struct phylink *pl, unsigned int phy_id,
-- 
2.35.1

[PATCH v0 RFC RFT net-next 2/5] net: phy: Convert to mdiobus_c45_{read|write}

[Andrew Lunn]

Stop using the helpers to construct a special phy address which
indicates C45. Instead use the C45 accessors, which will call the
busses C45 specific read/write API.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
---
 drivers/net/phy/phy.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index beb2b66da132..9034c6a8e18f 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -295,20 +295,20 @@ int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
 		if (mdio_phy_id_is_c45(mii_data->phy_id)) {
 			prtad = mdio_phy_id_prtad(mii_data->phy_id);
 			devad = mdio_phy_id_devad(mii_data->phy_id);
-			devad = mdiobus_c45_addr(devad, mii_data->reg_num);
+			mii_data->val_out = mdiobus_c45_read(
+				phydev->mdio.bus, prtad, devad,
+				mii_data->reg_num);
 		} else {
-			prtad = mii_data->phy_id;
-			devad = mii_data->reg_num;
+			mii_data->val_out = mdiobus_read(
+				phydev->mdio.bus, mii_data->phy_id,
+				mii_data->reg_num);
 		}
-		mii_data->val_out = mdiobus_read(phydev->mdio.bus, prtad,
-						 devad);
 		return 0;
 
 	case SIOCSMIIREG:
 		if (mdio_phy_id_is_c45(mii_data->phy_id)) {
 			prtad = mdio_phy_id_prtad(mii_data->phy_id);
 			devad = mdio_phy_id_devad(mii_data->phy_id);
-			devad = mdiobus_c45_addr(devad, mii_data->reg_num);
 		} else {
 			prtad = mii_data->phy_id;
 			devad = mii_data->reg_num;
@@ -351,7 +351,11 @@ int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
 			}
 		}
 
-		mdiobus_write(phydev->mdio.bus, prtad, devad, val);
+		if (mdio_phy_id_is_c45(mii_data->phy_id))
+			mdiobus_c45_write(phydev->mdio.bus, prtad, devad,
+					  mii_data->reg_num, val);
+		else
+			mdiobus_write(phydev->mdio.bus, prtad, devad, val);
 
 		if (prtad == phydev->mdio.addr &&
 		    devad == MII_BMCR &&
-- 
2.35.1

[PATCH v0 RFC RFT net-next 3/5] net: phy: bcm87xx: Use mmd helpers

[Andrew Lunn]

Rather than construct special phy device addresses to access C45
registers, use the mmd helpers. These will directly call the C45 API
of the MDIO bus driver.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
---
 drivers/net/phy/bcm87xx.c | 36 ++++++++++++++++++++----------------
 1 file changed, 20 insertions(+), 16 deletions(-)

diff --git a/drivers/net/phy/bcm87xx.c b/drivers/net/phy/bcm87xx.c
index 313563482690..cc2858107668 100644
--- a/drivers/net/phy/bcm87xx.c
+++ b/drivers/net/phy/bcm87xx.c
@@ -10,12 +10,12 @@
 #define PHY_ID_BCM8706	0x0143bdc1
 #define PHY_ID_BCM8727	0x0143bff0
 
-#define BCM87XX_PMD_RX_SIGNAL_DETECT	(MII_ADDR_C45 | 0x1000a)
-#define BCM87XX_10GBASER_PCS_STATUS	(MII_ADDR_C45 | 0x30020)
-#define BCM87XX_XGXS_LANE_STATUS	(MII_ADDR_C45 | 0x40018)
+#define BCM87XX_PMD_RX_SIGNAL_DETECT	0x000a
+#define BCM87XX_10GBASER_PCS_STATUS	0x0020
+#define BCM87XX_XGXS_LANE_STATUS	0x0018
 
-#define BCM87XX_LASI_CONTROL (MII_ADDR_C45 | 0x39002)
-#define BCM87XX_LASI_STATUS (MII_ADDR_C45 | 0x39005)
+#define BCM87XX_LASI_CONTROL		0x9002
+#define BCM87XX_LASI_STATUS		0x9005
 
 #if IS_ENABLED(CONFIG_OF_MDIO)
 /* Set and/or override some configuration registers based on the
@@ -54,11 +54,10 @@ static int bcm87xx_of_reg_init(struct phy_device *phydev)
 		u16 reg		= be32_to_cpup(paddr++);
 		u16 mask	= be32_to_cpup(paddr++);
 		u16 val_bits	= be32_to_cpup(paddr++);
-		u32 regnum = mdiobus_c45_addr(devid, reg);
 		int val = 0;
 
 		if (mask) {
-			val = phy_read(phydev, regnum);
+			val = phy_read_mmd(phydev, devid, reg);
 			if (val < 0) {
 				ret = val;
 				goto err;
@@ -67,7 +66,7 @@ static int bcm87xx_of_reg_init(struct phy_device *phydev)
 		}
 		val |= val_bits;
 
-		ret = phy_write(phydev, regnum, val);
+		ret = phy_write_mmd(phydev, devid, reg, val);
 		if (ret < 0)
 			goto err;
 	}
@@ -104,21 +103,24 @@ static int bcm87xx_read_status(struct phy_device *phydev)
 	int pcs_status;
 	int xgxs_lane_status;
 
-	rx_signal_detect = phy_read(phydev, BCM87XX_PMD_RX_SIGNAL_DETECT);
+	rx_signal_detect = phy_read_mmd(phydev, MDIO_MMD_PMAPMD,
+					BCM87XX_PMD_RX_SIGNAL_DETECT);
 	if (rx_signal_detect < 0)
 		return rx_signal_detect;
 
 	if ((rx_signal_detect & 1) == 0)
 		goto no_link;
 
-	pcs_status = phy_read(phydev, BCM87XX_10GBASER_PCS_STATUS);
+	pcs_status = phy_read_mmd(phydev, MDIO_MMD_PCS,
+				  BCM87XX_10GBASER_PCS_STATUS);
 	if (pcs_status < 0)
 		return pcs_status;
 
 	if ((pcs_status & 1) == 0)
 		goto no_link;
 
-	xgxs_lane_status = phy_read(phydev, BCM87XX_XGXS_LANE_STATUS);
+	xgxs_lane_status = phy_read_mmd(phydev, MDIO_MMD_PHYXS,
+					BCM87XX_XGXS_LANE_STATUS);
 	if (xgxs_lane_status < 0)
 		return xgxs_lane_status;
 
@@ -139,25 +141,27 @@ static int bcm87xx_config_intr(struct phy_device *phydev)
 {
 	int reg, err;
 
-	reg = phy_read(phydev, BCM87XX_LASI_CONTROL);
+	reg = phy_read_mmd(phydev, MDIO_MMD_PCS, BCM87XX_LASI_CONTROL);
 
 	if (reg < 0)
 		return reg;
 
 	if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
-		err = phy_read(phydev, BCM87XX_LASI_STATUS);
+		err = phy_read_mmd(phydev, MDIO_MMD_PCS, BCM87XX_LASI_STATUS);
 		if (err)
 			return err;
 
 		reg |= 1;
-		err = phy_write(phydev, BCM87XX_LASI_CONTROL, reg);
+		err = phy_write_mmd(phydev, MDIO_MMD_PCS,
+				    BCM87XX_LASI_CONTROL, reg);
 	} else {
 		reg &= ~1;
-		err = phy_write(phydev, BCM87XX_LASI_CONTROL, reg);
+		err = phy_write_mmd(phydev, MDIO_MMD_PCS,
+				    BCM87XX_LASI_CONTROL, reg);
 		if (err)
 			return err;
 
-		err = phy_read(phydev, BCM87XX_LASI_STATUS);
+		err = phy_read_mmd(phydev, MDIO_MMD_PCS, BCM87XX_LASI_STATUS);
 	}
 
 	return err;
-- 
2.35.1

[PATCH v0 RFC RFT net-next 4/5] net: dsa: sja1105: Convert to mdiobus_c45_read

[Andrew Lunn]

Stop using the helpers to construct a special phy address which
indicates C45. Instead use the C45 accessors, which will call the
busses C45 specific read/write API.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
---
 drivers/net/dsa/sja1105/sja1105_main.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index b33841c6507a..72b6fc1932b5 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -2252,14 +2252,13 @@ int sja1105_static_config_reload(struct sja1105_private *priv,
 	 * change it through the dynamic interface later.
 	 */
 	for (i = 0; i < ds->num_ports; i++) {
-		u32 reg_addr = mdiobus_c45_addr(MDIO_MMD_VEND2, MDIO_CTRL1);
-
 		speed_mbps[i] = sja1105_port_speed_to_ethtool(priv,
 							      mac[i].speed);
 		mac[i].speed = priv->info->port_speed[SJA1105_SPEED_AUTO];
 
 		if (priv->xpcs[i])
-			bmcr[i] = mdiobus_read(priv->mdio_pcs, i, reg_addr);
+			bmcr[i] = mdiobus_c45_read(priv->mdio_pcs, i,
+						   MDIO_MMD_VEND2, MDIO_CTRL1);
 	}
 
 	/* No PTP operations can run right now */
-- 
2.35.1

Re: [PATCH v0 RFC RFT net-next 4/5] net: dsa: sja1105: Convert to mdiobus_c45_read

[Vladimir Oltean]

On Fri, Apr 08, 2022 at 12:50:22AM +0200, Andrew Lunn wrote:
> Stop using the helpers to construct a special phy address which
> indicates C45. Instead use the C45 accessors, which will call the
> busses C45 specific read/write API.
> 
> Signed-off-by: Andrew Lunn <andrew@lunn.ch>
> ---

Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com>

[PATCH v0 RFC RFT net-next 5/5] net: pcs: pcs-xpcs: Convert to mdiobus_c45_read

[Andrew Lunn]

Stop using the helpers to construct a special mdio address which
indicates C45. Instead use the C45 accessors, which will call the
busses C45 specific read/write API.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
---
 drivers/net/pcs/pcs-xpcs.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
index 61418d4dc0cd..4cfd05c15aee 100644
--- a/drivers/net/pcs/pcs-xpcs.c
+++ b/drivers/net/pcs/pcs-xpcs.c
@@ -175,20 +175,18 @@ static bool __xpcs_linkmode_supported(const struct xpcs_compat *compat,
 
 int xpcs_read(struct dw_xpcs *xpcs, int dev, u32 reg)
 {
-	u32 reg_addr = mdiobus_c45_addr(dev, reg);
 	struct mii_bus *bus = xpcs->mdiodev->bus;
 	int addr = xpcs->mdiodev->addr;
 
-	return mdiobus_read(bus, addr, reg_addr);
+	return mdiobus_c45_read(bus, addr, dev, reg);
 }
 
 int xpcs_write(struct dw_xpcs *xpcs, int dev, u32 reg, u16 val)
 {
-	u32 reg_addr = mdiobus_c45_addr(dev, reg);
 	struct mii_bus *bus = xpcs->mdiodev->bus;
 	int addr = xpcs->mdiodev->addr;
 
-	return mdiobus_write(bus, addr, reg_addr, val);
+	return mdiobus_c45_write(bus, addr, dev, reg, val);
 }
 
 static int xpcs_read_vendor(struct dw_xpcs *xpcs, int dev, u32 reg)
-- 
2.35.1

Re: [PATCH v0 RFC RFT net-next 5/5] net: pcs: pcs-xpcs: Convert to mdiobus_c45_read

[Vladimir Oltean]

On Fri, Apr 08, 2022 at 12:50:23AM +0200, Andrew Lunn wrote:
> Stop using the helpers to construct a special mdio address which
> indicates C45. Instead use the C45 accessors, which will call the
> busses C45 specific read/write API.
> 
> Signed-off-by: Andrew Lunn <andrew@lunn.ch>
> ---

Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com>