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path: root/drivers/net/phy/phy_device.c
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Diffstat (limited to 'drivers/net/phy/phy_device.c')
-rw-r--r--drivers/net/phy/phy_device.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index de2b6333e7ea..0af66f32d363 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1880,6 +1880,54 @@ int genphy_config_init(struct phy_device *phydev)
}
EXPORT_SYMBOL(genphy_config_init);
+/**
+ * genphy_read_abilities - read PHY abilities from Clause 22 registers
+ * @phydev: target phy_device struct
+ *
+ * Description: Reads the PHY's abilities and populates
+ * phydev->supported accordingly.
+ *
+ * Returns: 0 on success, < 0 on failure
+ */
+int genphy_read_abilities(struct phy_device *phydev)
+{
+ int val;
+
+ linkmode_set_bit_array(phy_basic_ports_array,
+ ARRAY_SIZE(phy_basic_ports_array),
+ phydev->supported);
+
+ val = phy_read(phydev, MII_BMSR);
+ if (val < 0)
+ return val;
+
+ linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->supported,
+ val & BMSR_ANEGCAPABLE);
+
+ linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, phydev->supported,
+ val & BMSR_100FULL);
+ linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, phydev->supported,
+ val & BMSR_100HALF);
+ linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, phydev->supported,
+ val & BMSR_10FULL);
+ linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, phydev->supported,
+ val & BMSR_10HALF);
+
+ if (val & BMSR_ESTATEN) {
+ val = phy_read(phydev, MII_ESTATUS);
+ if (val < 0)
+ return val;
+
+ linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
+ phydev->supported, val & ESTATUS_1000_TFULL);
+ linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
+ phydev->supported, val & ESTATUS_1000_THALF);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(genphy_read_abilities);
+
/* This is used for the phy device which doesn't support the MMD extended
* register access, but it does have side effect when we are trying to access
* the MMD register via indirect method.