• Giuseppe CAVALLARO's avatar
    phy: add the EEE support and the way to access to the MMD registers. · a59a4d19
    Giuseppe CAVALLARO authored
    This patch adds the support for the Energy-Efficient Ethernet (EEE)
    to the Physical Abstraction Layer.
    To support the EEE we have to access to the MMD registers 3.20 and
    7.60/61. So two new functions have been added to read/write the MMD
    registers (clause 45).
    
    An Ethernet driver (I tested the stmmac) can invoke the phy_init_eee to properly
    check if the EEE is supported by the PHYs and it can also set the clock
    stop enable bit in the 3.0 register.
    The phy_get_eee_err can be used for reporting the number of time where
    the PHY failed to complete its normal wake sequence.
    
    In the end, this patch also adds the EEE ethtool support implementing:
     o phy_ethtool_set_eee
     o phy_ethtool_get_eee
    
    v1: initial patch
    v2: fixed some errors especially on naming convention
    v3: renamed again the mmd read/write functions thank to Ben's feedback
    v4: moved file to phy.c and added the ethtool support.
    v5: fixed phy_adv_to_eee, phy_eee_to_supported, phy_eee_to_adv return
        values according to ethtool API (thanks to Ben's feedback).
        Renamed some macros to avoid too long names.
    v6: fixed kernel-doc comments to be properly parsed.
        Fixed the phy_init_eee function: we need to check which link mode
        was autonegotiated and then the corresponding bits in 7.60 and 7.61
        registers.
    v7: reviewed the way to get the negotiated settings.
    v8: fixed a problem in the phy_init_eee return value erroneously added
        when included the phy_read_status call.
    v9: do not remove the MDIO_AN_EEE_ADV_100TX and MDIO_AN_EEE_ADV_1000T
        and fixed the eee_{cap,lp,adv} declaration as "int" instead of u16.
    Signed-off-by: default avatarGiuseppe Cavallaro <peppe.cavallaro@st.com>
    Reviewed-by: default avatarBen Hutchings <bhutchings@solarflare.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    a59a4d19
phy.c 30.3 KB