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    Subject[RFC net-next v2 02/14] net: stmmac: dwmac100: Add MAC loopback support
    Date
    In preparation for the addition of stmmac selftests we implement the MAC
    loopback callback in dwmac100 core.

    Signed-off-by: Jose Abreu <joabreu@synopsys.com>
    Cc: Joao Pinto <jpinto@synopsys.com>
    Cc: David S. Miller <davem@davemloft.net>
    Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
    Cc: Alexandre Torgue <alexandre.torgue@st.com>
    Cc: Corentin Labbe <clabbe.montjoie@gmail.com>
    ---
    drivers/net/ethernet/stmicro/stmmac/dwmac100_core.c | 13 +++++++++++++
    1 file changed, 13 insertions(+)

    diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac100_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac100_core.c
    index b735143987e1..d621b5189c41 100644
    --- a/drivers/net/ethernet/stmicro/stmmac/dwmac100_core.c
    +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac100_core.c
    @@ -160,6 +160,18 @@ static void dwmac100_pmt(struct mac_device_info *hw, unsigned long mode)
    return;
    }

    +static void dwmac100_set_mac_loopback(void __iomem *ioaddr, bool enable)
    +{
    + u32 value = readl(ioaddr + MAC_CONTROL);
    +
    + if (enable)
    + value |= MAC_CONTROL_OM;
    + else
    + value &= ~MAC_CONTROL_OM;
    +
    + writel(value, ioaddr + MAC_CONTROL);
    +}
    +
    const struct stmmac_ops dwmac100_ops = {
    .core_init = dwmac100_core_init,
    .set_mac = stmmac_set_mac,
    @@ -171,6 +183,7 @@ const struct stmmac_ops dwmac100_ops = {
    .pmt = dwmac100_pmt,
    .set_umac_addr = dwmac100_set_umac_addr,
    .get_umac_addr = dwmac100_get_umac_addr,
    + .set_mac_loopback = dwmac100_set_mac_loopback,
    };

    int dwmac100_setup(struct stmmac_priv *priv)
    --
    2.7.4
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