netdev - [PATCH net-next 2/5] net: phy: marvell10g: add MDI swap reporting

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Date:   Fri, 29 Dec 2017 12:46:27 +0000
From:   Russell King <rmk+kernel@...linux.org.uk>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org
Subject: [PATCH net-next 2/5] net: phy: marvell10g: add MDI swap reporting

Add reporting of the MDI swap to the Marvell 10G PHY driver by providing
a generic implementation for the standard 10GBASE-T pair swap register
and polarity register.  We also support reading the MDI swap status for
1G and below from a PCS register.

Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
---
 drivers/net/phy/marvell10g.c | 31 +++++++++++++++++++++++++++++++
 drivers/net/phy/phy-c45.c    | 33 +++++++++++++++++++++++++++++++++
 include/linux/phy.h          |  1 +
 3 files changed, 65 insertions(+)

diff --git a/drivers/net/phy/marvell10g.c b/drivers/net/phy/marvell10g.c
index 0d503493ac14..632f2ec15e39 100644
--- a/drivers/net/phy/marvell10g.c
+++ b/drivers/net/phy/marvell10g.c
@@ -31,6 +31,11 @@ enum {
 	MV_PCS_BASE_R		= 0x1000,
 	MV_PCS_1000BASEX	= 0x2000,
 
+	MV_PCS_PAIRSWAP		= 0x8182,
+	MV_PCS_PAIRSWAP_MASK	= 0x0003,
+	MV_PCS_PAIRSWAP_AB	= 0x0002,
+	MV_PCS_PAIRSWAP_NONE	= 0x0003,
+
 	/* These registers appear at 0x800X and 0xa00X - the 0xa00X control
 	 * registers appear to set themselves to the 0x800X when AN is
 	 * restarted, but status registers appear readable from either.
@@ -267,6 +272,9 @@ static int mv3310_config_aneg(struct phy_device *phydev)
 	u32 advertising;
 	int ret;
 
+	/* We don't support manual MDI control */
+	phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
+
 	if (phydev->autoneg == AUTONEG_DISABLE) {
 		ret = genphy_c45_pma_setup_forced(phydev);
 		if (ret < 0)
@@ -356,6 +364,7 @@ static int mv3310_read_status(struct phy_device *phydev)
 	phydev->link = 0;
 	phydev->pause = 0;
 	phydev->asym_pause = 0;
+	phydev->mdix = 0;
 
 	val = phy_read_mmd(phydev, MDIO_MMD_PCS, MV_PCS_BASE_R + MDIO_STAT1);
 	if (val < 0)
@@ -410,6 +419,28 @@ static int mv3310_read_status(struct phy_device *phydev)
 			return val;
 	}
 
+	if (phydev->speed == SPEED_10000) {
+		val = genphy_c45_read_mdix(phydev);
+		if (val < 0)
+			return val;
+	} else {
+		val = phy_read_mmd(phydev, MDIO_MMD_PCS, MV_PCS_PAIRSWAP);
+		if (val < 0)
+			return val;
+
+		switch (val & MV_PCS_PAIRSWAP_MASK) {
+		case MV_PCS_PAIRSWAP_AB:
+			phydev->mdix = ETH_TP_MDI_X;
+			break;
+		case MV_PCS_PAIRSWAP_NONE:
+			phydev->mdix = ETH_TP_MDI;
+			break;
+		default:
+			phydev->mdix = ETH_TP_MDI_INVALID;
+			break;
+		}
+	}
+
 	if ((phydev->interface == PHY_INTERFACE_MODE_SGMII ||
 	     phydev->interface == PHY_INTERFACE_MODE_10GKR) && phydev->link) {
 		/* The PHY automatically switches its serdes interface (and
diff --git a/drivers/net/phy/phy-c45.c b/drivers/net/phy/phy-c45.c
index dada819c6b78..a4576859afae 100644
--- a/drivers/net/phy/phy-c45.c
+++ b/drivers/net/phy/phy-c45.c
@@ -233,6 +233,39 @@ int genphy_c45_read_pma(struct phy_device *phydev)
 }
 EXPORT_SYMBOL_GPL(genphy_c45_read_pma);
 
+/**
+ * genphy_c45_read_mdix - read mdix status from PMA
+ * @phydev: target phy_device struct
+ */
+int genphy_c45_read_mdix(struct phy_device *phydev)
+{
+	int val;
+
+	if (phydev->speed == SPEED_10000) {
+		val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD,
+				   MDIO_PMA_10GBT_SWAPPOL);
+		if (val < 0)
+			return val;
+
+		switch (val) {
+		case MDIO_PMA_10GBT_SWAPPOL_ABNX | MDIO_PMA_10GBT_SWAPPOL_CDNX:
+			phydev->mdix = ETH_TP_MDI;
+			break;
+
+		case 0:
+			phydev->mdix = ETH_TP_MDI_X;
+			break;
+
+		default:
+			phydev->mdix = ETH_TP_MDI_INVALID;
+			break;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(genphy_c45_read_mdix);
+
 /* The gen10g_* functions are the old Clause 45 stub */
 
 static int gen10g_config_aneg(struct phy_device *phydev)
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 0ee4ece312da..bb89a60716c2 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -943,6 +943,7 @@ int genphy_c45_read_lpa(struct phy_device *phydev);
 int genphy_c45_read_pma(struct phy_device *phydev);
 int genphy_c45_pma_setup_forced(struct phy_device *phydev);
 int genphy_c45_an_disable_aneg(struct phy_device *phydev);
+int genphy_c45_read_mdix(struct phy_device *phydev);
 
 static inline int phy_read_status(struct phy_device *phydev)
 {
-- 
2.7.4