mdio: translation of MMD EEE registers to/from ethtool settings

The helper functions which translate IEEE MDIO Manageable Device (MMD)
Energy-Efficient Ethernet (EEE) registers 3.20, 7.60 and 7.61 to and from
the comparable ethtool supported/advertised settings will be needed by
drivers other than those in PHYLIB (e.g. e1000e in a follow-on patch).

In the same fashion as similar translation functions in linux/mii.h, move
these functions from the PHYLIB core to the linux/mdio.h header file so the
code will not have to be duplicated in each driver needing MMD-to-ethtool
(and vice-versa) translations.  The function and some variable names have
been renamed to be more descriptive.

Not tested on the only hardware that currently calls the related functions,
stmmac, because I don't have access to any.  Has been compile tested and
the translations have been tested on a locally modified version of e1000e.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 90 insertions, 67 deletions

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 7ca2ff97c368..ef9ea9248223 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -1035,66 +1035,6 @@ static void phy_write_mmd_indirect(struct mii_bus *bus, int prtad, int devad,
         bus->write(bus, addr, MII_MMD_DATA, data);
 }
 
-static u32 phy_eee_to_adv(u16 eee_adv)
-{
-        u32 adv = 0;
-
-        if (eee_adv & MDIO_EEE_100TX)
-                adv |= ADVERTISED_100baseT_Full;
-        if (eee_adv & MDIO_EEE_1000T)
-                adv |= ADVERTISED_1000baseT_Full;
-        if (eee_adv & MDIO_EEE_10GT)
-                adv |= ADVERTISED_10000baseT_Full;
-        if (eee_adv & MDIO_EEE_1000KX)
-                adv |= ADVERTISED_1000baseKX_Full;
-        if (eee_adv & MDIO_EEE_10GKX4)
-                adv |= ADVERTISED_10000baseKX4_Full;
-        if (eee_adv & MDIO_EEE_10GKR)
-                adv |= ADVERTISED_10000baseKR_Full;
-
-        return adv;
-}
-
-static u32 phy_eee_to_supported(u16 eee_caported)
-{
-        u32 supported = 0;
-
-        if (eee_caported & MDIO_EEE_100TX)
-                supported |= SUPPORTED_100baseT_Full;
-        if (eee_caported & MDIO_EEE_1000T)
-                supported |= SUPPORTED_1000baseT_Full;
-        if (eee_caported & MDIO_EEE_10GT)
-                supported |= SUPPORTED_10000baseT_Full;
-        if (eee_caported & MDIO_EEE_1000KX)
-                supported |= SUPPORTED_1000baseKX_Full;
-        if (eee_caported & MDIO_EEE_10GKX4)
-                supported |= SUPPORTED_10000baseKX4_Full;
-        if (eee_caported & MDIO_EEE_10GKR)
-                supported |= SUPPORTED_10000baseKR_Full;
-
-        return supported;
-}
-
-static u16 phy_adv_to_eee(u32 adv)
-{
-        u16 reg = 0;
-
-        if (adv & ADVERTISED_100baseT_Full)
-                reg |= MDIO_EEE_100TX;
-        if (adv & ADVERTISED_1000baseT_Full)
-                reg |= MDIO_EEE_1000T;
-        if (adv & ADVERTISED_10000baseT_Full)
-                reg |= MDIO_EEE_10GT;
-        if (adv & ADVERTISED_1000baseKX_Full)
-                reg |= MDIO_EEE_1000KX;
-        if (adv & ADVERTISED_10000baseKX4_Full)
-                reg |= MDIO_EEE_10GKX4;
-        if (adv & ADVERTISED_10000baseKR_Full)
-                reg |= MDIO_EEE_10GKR;
-
-        return reg;
-}
-
 /**
  * phy_init_eee - init and check the EEE feature
  * @phydev: target phy_device struct
@@ -1132,7 +1072,7 @@ int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
                 if (eee_cap < 0)
                         return eee_cap;
 
-                cap = phy_eee_to_supported(eee_cap);
+                cap = mmd_eee_cap_to_ethtool_sup_t(eee_cap);
                 if (!cap)
                         goto eee_exit;
 
@@ -1149,8 +1089,8 @@ int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
                 if (eee_adv < 0)
                         return eee_adv;
 
-                adv = phy_eee_to_adv(eee_adv);
-                lp = phy_eee_to_adv(eee_lp);
+                adv = mmd_eee_adv_to_ethtool_adv_t(eee_adv);
+                lp = mmd_eee_adv_to_ethtool_adv_t(eee_lp);
                 idx = phy_find_setting(phydev->speed, phydev->duplex);
                 if ((lp & adv & settings[idx].setting))
                         goto eee_exit;
@@ -1210,21 +1150,21 @@ int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data)
                                     MDIO_MMD_PCS, phydev->addr);
         if (val < 0)
                 return val;
-        data->supported = phy_eee_to_supported(val);
+        data->supported = mmd_eee_cap_to_ethtool_sup_t(val);
 
         /* Get advertisement EEE */
         val = phy_read_mmd_indirect(phydev->bus, MDIO_AN_EEE_ADV,
                                     MDIO_MMD_AN, phydev->addr);
         if (val < 0)
                 return val;
-        data->advertised = phy_eee_to_adv(val);
+        data->advertised = mmd_eee_adv_to_ethtool_adv_t(val);
 
         /* Get LP advertisement EEE */
         val = phy_read_mmd_indirect(phydev->bus, MDIO_AN_EEE_LPABLE,
                                     MDIO_MMD_AN, phydev->addr);
         if (val < 0)
                 return val;
-        data->lp_advertised = phy_eee_to_adv(val);
+        data->lp_advertised = mmd_eee_adv_to_ethtool_adv_t(val);
 
         return 0;
 }
@@ -1241,7 +1181,7 @@ int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
 {
         int val;
 
-        val = phy_adv_to_eee(data->advertised);
+        val = ethtool_adv_to_mmd_eee_adv_t(data->advertised);
         phy_write_mmd_indirect(phydev->bus, MDIO_AN_EEE_ADV, MDIO_MMD_AN,
                                phydev->addr, val);
 
diff --git a/include/linux/mdio.h b/include/linux/mdio.h
index 7cccafe50e7b..6c406845f7e2 100644
--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -377,5 +377,88 @@ static inline void mdio45_ethtool_gset(const struct mdio_if_info *mdio,
 extern int mdio_mii_ioctl(const struct mdio_if_info *mdio,
                           struct mii_ioctl_data *mii_data, int cmd);
 
+/**
+ * mmd_eee_cap_to_ethtool_sup_t
+ * @eee_cap: value of the MMD EEE Capability register
+ *
+ * A small helper function that translates MMD EEE Capability (3.20) bits
+ * to ethtool supported settings.
+ */
+static inline u32 mmd_eee_cap_to_ethtool_sup_t(u16 eee_cap)
+{
+        u32 supported = 0;
+
+        if (eee_cap & MDIO_EEE_100TX)
+                supported |= SUPPORTED_100baseT_Full;
+        if (eee_cap & MDIO_EEE_1000T)
+                supported |= SUPPORTED_1000baseT_Full;
+        if (eee_cap & MDIO_EEE_10GT)
+                supported |= SUPPORTED_10000baseT_Full;
+        if (eee_cap & MDIO_EEE_1000KX)
+                supported |= SUPPORTED_1000baseKX_Full;
+        if (eee_cap & MDIO_EEE_10GKX4)
+                supported |= SUPPORTED_10000baseKX4_Full;
+        if (eee_cap & MDIO_EEE_10GKR)
+                supported |= SUPPORTED_10000baseKR_Full;
+
+        return supported;
+}
+
+/**
+ * mmd_eee_adv_to_ethtool_adv_t
+ * @eee_adv: value of the MMD EEE Advertisement/Link Partner Ability registers
+ *
+ * A small helper function that translates the MMD EEE Advertisment (7.60)
+ * and MMD EEE Link Partner Ability (7.61) bits to ethtool advertisement
+ * settings.
+ */
+static inline u32 mmd_eee_adv_to_ethtool_adv_t(u16 eee_adv)
+{
+        u32 adv = 0;
+
+        if (eee_adv & MDIO_EEE_100TX)
+                adv |= ADVERTISED_100baseT_Full;
+        if (eee_adv & MDIO_EEE_1000T)
+                adv |= ADVERTISED_1000baseT_Full;
+        if (eee_adv & MDIO_EEE_10GT)