net: pcs: Introducing support for DWC xpcs Energy Efficient Ethernet

Add DWC xpcs EEE support callbacks.The callback function is used to
set EEE registers on xpcs.

xpcs transparent mode is enabled to allow PHY to detect MAC EEE status.

Signed-off-by: Michael Sit Wei Hong <michael.wei.hong.sit@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
index 944ba105cac16598865f3d245801a9b142cf0dc8..aa985a5aae8d699be267852512a8dac07d95fd30 100644 (file)
--- a/drivers/net/pcs/pcs-xpcs.c
+++ b/drivers/net/pcs/pcs-xpcs.c
@@ -63,6 +63,9 @@
 #define DW_VR_MII_DIG_CTRL1            0x8000
 #define DW_VR_MII_AN_CTRL              0x8001
 #define DW_VR_MII_AN_INTR_STS          0x8002
+/* EEE Mode Control Register */
+#define DW_VR_MII_EEE_MCTRL0           0x8006
+#define DW_VR_MII_EEE_MCTRL1           0x800b
 
 /* VR_MII_DIG_CTRL1 */
 #define DW_VR_MII_DIG_CTRL1_MAC_AUTO_SW                BIT(9)
@@ -86,6 +89,20 @@
 #define DW_VR_MII_C37_ANSGM_SP_1000            0x2
 #define DW_VR_MII_C37_ANSGM_SP_LNKSTS          BIT(4)
 
+/* VR MII EEE Control 0 defines */
+#define DW_VR_MII_EEE_LTX_EN           BIT(0)  /* LPI Tx Enable */
+#define DW_VR_MII_EEE_LRX_EN           BIT(1)  /* LPI Rx Enable */
+#define DW_VR_MII_EEE_TX_QUIET_EN              BIT(2)  /* Tx Quiet Enable */
+#define DW_VR_MII_EEE_RX_QUIET_EN              BIT(3)  /* Rx Quiet Enable */
+#define DW_VR_MII_EEE_TX_EN_CTRL               BIT(4)  /* Tx Control Enable */
+#define DW_VR_MII_EEE_RX_EN_CTRL               BIT(7)  /* Rx Control Enable */
+
+#define DW_VR_MII_EEE_MULT_FACT_100NS_SHIFT    8
+#define DW_VR_MII_EEE_MULT_FACT_100NS          GENMASK(11, 8)
+
+/* VR MII EEE Control 1 defines */
+#define DW_VR_MII_EEE_TRN_LPI          BIT(0)  /* Transparent Mode Enable */
+
 static const int xpcs_usxgmii_features[] = {
        ETHTOOL_LINK_MODE_Pause_BIT,
        ETHTOOL_LINK_MODE_Asym_Pause_BIT,
@@ -650,6 +667,39 @@ static int xpcs_validate(struct mdio_xpcs_args *xpcs,
        return 0;
 }
 
+static int xpcs_config_eee(struct mdio_xpcs_args *xpcs, int mult_fact_100ns,
+                          int enable)
+{
+       int ret;
+
+       if (enable) {
+       /* Enable EEE */
+               ret = DW_VR_MII_EEE_LTX_EN | DW_VR_MII_EEE_LRX_EN |
+                     DW_VR_MII_EEE_TX_QUIET_EN | DW_VR_MII_EEE_RX_QUIET_EN |
+                     DW_VR_MII_EEE_TX_EN_CTRL | DW_VR_MII_EEE_RX_EN_CTRL |
+                     mult_fact_100ns << DW_VR_MII_EEE_MULT_FACT_100NS_SHIFT;
+       } else {
+               ret = xpcs_read(xpcs, MDIO_MMD_VEND2, DW_VR_MII_EEE_MCTRL0);
+               if (ret < 0)
+                       return ret;
+               ret &= ~(DW_VR_MII_EEE_LTX_EN | DW_VR_MII_EEE_LRX_EN |
+                      DW_VR_MII_EEE_TX_QUIET_EN | DW_VR_MII_EEE_RX_QUIET_EN |
+                      DW_VR_MII_EEE_TX_EN_CTRL | DW_VR_MII_EEE_RX_EN_CTRL |
+                      DW_VR_MII_EEE_MULT_FACT_100NS);
+       }
+
+       ret = xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_EEE_MCTRL0, ret);
+       if (ret < 0)
+               return ret;
+
+       ret = xpcs_read(xpcs, MDIO_MMD_VEND2, DW_VR_MII_EEE_MCTRL1);
+       if (ret < 0)
+               return ret;
+
+       ret |= DW_VR_MII_EEE_TRN_LPI;
+       return xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_EEE_MCTRL1, ret);
+}
+
 static int xpcs_config_aneg_c37_sgmii(struct mdio_xpcs_args *xpcs)
 {
        int ret;
@@ -908,6 +958,7 @@ static struct mdio_xpcs_ops xpcs_ops = {
        .get_state = xpcs_get_state,
        .link_up = xpcs_link_up,
        .probe = xpcs_probe,
+       .config_eee = xpcs_config_eee,
 };
 
 struct mdio_xpcs_ops *mdio_xpcs_get_ops(void)

diff --git a/include/linux/pcs/pcs-xpcs.h b/include/linux/pcs/pcs-xpcs.h
index 2cb5188a7ef13900582ee89ffce15847e6555349..5938ced805f47e314154373a5b88d18426e56299 100644 (file)
--- a/include/linux/pcs/pcs-xpcs.h
+++ b/include/linux/pcs/pcs-xpcs.h
@@ -32,6 +32,8 @@ struct mdio_xpcs_ops {
        int (*link_up)(struct mdio_xpcs_args *xpcs, int speed,
                       phy_interface_t interface);
        int (*probe)(struct mdio_xpcs_args *xpcs, phy_interface_t interface);
+       int (*config_eee)(struct mdio_xpcs_args *xpcs, int mult_fact_100ns,
+                         int enable);
 };
 
 #if IS_ENABLED(CONFIG_PCS_XPCS)