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    Subject[PATCH net-next 04/11] net: stmmac: dwmac4/5: Add MAC loopback support
    Date
    In preparation for the addition of stmmac selftests we implement the MAC
    loopback callback in dwmac4/5 cores.

    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>
    ---
    drivers/net/ethernet/stmicro/stmmac/dwmac4.h | 1 +
    drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c | 15 +++++++++++++++
    2 files changed, 16 insertions(+)

    diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
    index eb013d54025a..3dddd7902b0f 100644
    --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
    +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
    @@ -160,6 +160,7 @@ enum power_event {
    #define GMAC_CONFIG_PS BIT(15)
    #define GMAC_CONFIG_FES BIT(14)
    #define GMAC_CONFIG_DM BIT(13)
    +#define GMAC_CONFIG_LM BIT(12)
    #define GMAC_CONFIG_DCRS BIT(9)
    #define GMAC_CONFIG_TE BIT(1)
    #define GMAC_CONFIG_RE BIT(0)
    diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
    index 7e5d5db0d516..2f1a2a6f9b33 100644
    --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
    +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
    @@ -701,6 +701,18 @@ static void dwmac4_debug(void __iomem *ioaddr, struct stmmac_extra_stats *x,
    x->mac_gmii_rx_proto_engine++;
    }

    +static void dwmac4_set_mac_loopback(void __iomem *ioaddr, bool enable)
    +{
    + u32 value = readl(ioaddr + GMAC_CONFIG);
    +
    + if (enable)
    + value |= GMAC_CONFIG_LM;
    + else
    + value &= ~GMAC_CONFIG_LM;
    +
    + writel(value, ioaddr + GMAC_CONFIG);
    +}
    +
    const struct stmmac_ops dwmac4_ops = {
    .core_init = dwmac4_core_init,
    .set_mac = stmmac_set_mac,
    @@ -730,6 +742,7 @@ const struct stmmac_ops dwmac4_ops = {
    .pcs_get_adv_lp = dwmac4_get_adv_lp,
    .debug = dwmac4_debug,
    .set_filter = dwmac4_set_filter,
    + .set_mac_loopback = dwmac4_set_mac_loopback,
    };

    const struct stmmac_ops dwmac410_ops = {
    @@ -761,6 +774,7 @@ const struct stmmac_ops dwmac410_ops = {
    .pcs_get_adv_lp = dwmac4_get_adv_lp,
    .debug = dwmac4_debug,
    .set_filter = dwmac4_set_filter,
    + .set_mac_loopback = dwmac4_set_mac_loopback,
    };

    const struct stmmac_ops dwmac510_ops = {
    @@ -797,6 +811,7 @@ const struct stmmac_ops dwmac510_ops = {
    .safety_feat_dump = dwmac5_safety_feat_dump,
    .rxp_config = dwmac5_rxp_config,
    .flex_pps_config = dwmac5_flex_pps_config,
    + .set_mac_loopback = dwmac4_set_mac_loopback,
    };

    int dwmac4_setup(struct stmmac_priv *priv)
    --
    2.7.4
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