[PATCH net-next 2/6] net: pcs: add C37 SGMII AN support for intel mGbE controller
From: Ong Boon Leong
Date: Mon Mar 15 2021 - 01:39:30 EST
XPCS IP supports C37 SGMII AN process and it is used in intel multi-GbE
controller as MAC-side SGMII.
Signed-off-by: Ong Boon Leong <boon.leong.ong@xxxxxxxxx>
---
drivers/net/pcs/pcs-xpcs.c | 167 ++++++++++++++++++++++++++++++++++-
include/linux/pcs/pcs-xpcs.h | 1 +
2 files changed, 167 insertions(+), 1 deletion(-)
diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
index 10def2d98696..944ba105cac1 100644
--- a/drivers/net/pcs/pcs-xpcs.c
+++ b/drivers/net/pcs/pcs-xpcs.c
@@ -15,6 +15,7 @@
#define SYNOPSYS_XPCS_USXGMII_ID 0x7996ced0
#define SYNOPSYS_XPCS_10GKR_ID 0x7996ced0
#define SYNOPSYS_XPCS_XLGMII_ID 0x7996ced0
+#define SYNOPSYS_XPCS_SGMII_ID 0x7996ced0
#define SYNOPSYS_XPCS_MASK 0xffffffff
/* Vendor regs access */
@@ -57,6 +58,34 @@
#define DW_C73_2500KX BIT(0)
#define DW_C73_5000KR BIT(1)
+/* Clause 37 Defines */
+/* VR MII MMD registers offsets */
+#define DW_VR_MII_DIG_CTRL1 0x8000
+#define DW_VR_MII_AN_CTRL 0x8001
+#define DW_VR_MII_AN_INTR_STS 0x8002
+
+/* VR_MII_DIG_CTRL1 */
+#define DW_VR_MII_DIG_CTRL1_MAC_AUTO_SW BIT(9)
+
+/* VR_MII_AN_CTRL */
+#define DW_VR_MII_AN_CTRL_TX_CONFIG_SHIFT 3
+#define DW_VR_MII_TX_CONFIG_MASK BIT(3)
+#define DW_VR_MII_TX_CONFIG_PHY_SIDE_SGMII 0x1
+#define DW_VR_MII_TX_CONFIG_MAC_SIDE_SGMII 0x0
+#define DW_VR_MII_AN_CTRL_PCS_MODE_SHIFT 1
+#define DW_VR_MII_PCS_MODE_MASK GENMASK(2, 1)
+#define DW_VR_MII_PCS_MODE_C37_1000BASEX 0x0
+#define DW_VR_MII_PCS_MODE_C37_SGMII 0x2
+
+/* VR_MII_AN_INTR_STS */
+#define DW_VR_MII_AN_STS_C37_ANSGM_FD BIT(1)
+#define DW_VR_MII_AN_STS_C37_ANSGM_SP_SHIFT 2
+#define DW_VR_MII_AN_STS_C37_ANSGM_SP GENMASK(3, 2)
+#define DW_VR_MII_C37_ANSGM_SP_10 0x0
+#define DW_VR_MII_C37_ANSGM_SP_100 0x1
+#define DW_VR_MII_C37_ANSGM_SP_1000 0x2
+#define DW_VR_MII_C37_ANSGM_SP_LNKSTS BIT(4)
+
static const int xpcs_usxgmii_features[] = {
ETHTOOL_LINK_MODE_Pause_BIT,
ETHTOOL_LINK_MODE_Asym_Pause_BIT,
@@ -105,6 +134,16 @@ static const int xpcs_xlgmii_features[] = {
__ETHTOOL_LINK_MODE_MASK_NBITS,
};
+static const int xpcs_sgmii_features[] = {
+ ETHTOOL_LINK_MODE_10baseT_Half_BIT,
+ ETHTOOL_LINK_MODE_10baseT_Full_BIT,
+ ETHTOOL_LINK_MODE_100baseT_Half_BIT,
+ ETHTOOL_LINK_MODE_100baseT_Full_BIT,
+ ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
+ ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
+ __ETHTOOL_LINK_MODE_MASK_NBITS,
+};
+
static const phy_interface_t xpcs_usxgmii_interfaces[] = {
PHY_INTERFACE_MODE_USXGMII,
PHY_INTERFACE_MODE_MAX,
@@ -120,6 +159,11 @@ static const phy_interface_t xpcs_xlgmii_interfaces[] = {
PHY_INTERFACE_MODE_MAX,
};
+static const phy_interface_t xpcs_sgmii_interfaces[] = {
+ PHY_INTERFACE_MODE_SGMII,
+ PHY_INTERFACE_MODE_MAX,
+};
+
static struct xpcs_id {
u32 id;
u32 mask;
@@ -145,6 +189,12 @@ static struct xpcs_id {
.supported = xpcs_xlgmii_features,
.interface = xpcs_xlgmii_interfaces,
.an_mode = DW_AN_C73,
+ }, {
+ .id = SYNOPSYS_XPCS_SGMII_ID,
+ .mask = SYNOPSYS_XPCS_MASK,
+ .supported = xpcs_sgmii_features,
+ .interface = xpcs_sgmii_interfaces,
+ .an_mode = DW_AN_C37_SGMII,
},
};
@@ -207,6 +257,9 @@ static int xpcs_soft_reset(struct mdio_xpcs_args *xpcs)
case DW_AN_C73:
dev = MDIO_MMD_PCS;
break;
+ case DW_AN_C37_SGMII:
+ dev = MDIO_MMD_VEND2;
+ break;
default:
return -1;
}
@@ -597,6 +650,47 @@ static int xpcs_validate(struct mdio_xpcs_args *xpcs,
return 0;
}
+static int xpcs_config_aneg_c37_sgmii(struct mdio_xpcs_args *xpcs)
+{
+ int ret;
+
+ /* For AN for C37 SGMII mode, the settings are :-
+ * 1) VR_MII_AN_CTRL Bit(2:1)[PCS_MODE] = 10b (SGMII AN)
+ * 2) VR_MII_AN_CTRL Bit(3) [TX_CONFIG] = 0b (MAC side SGMII)
+ * DW xPCS used with DW EQoS MAC is always MAC side SGMII.
+ * 3) VR_MII_DIG_CTRL1 Bit(9) [MAC_AUTO_SW] = 1b (Automatic
+ * speed/duplex mode change by HW after SGMII AN complete)
+ *
+ * Note: Since it is MAC side SGMII, there is no need to set
+ * SR_MII_AN_ADV. MAC side SGMII receives AN Tx Config from
+ * PHY about the link state change after C28 AN is completed
+ * between PHY and Link Partner. There is also no need to
+ * trigger AN restart for MAC-side SGMII.
+ */
+ ret = xpcs_read(xpcs, MDIO_MMD_VEND2, DW_VR_MII_AN_CTRL);
+ if (ret < 0)
+ return ret;
+
+ ret &= ~(DW_VR_MII_PCS_MODE_MASK | DW_VR_MII_TX_CONFIG_MASK);
+ ret |= (DW_VR_MII_PCS_MODE_C37_SGMII <<
+ DW_VR_MII_AN_CTRL_PCS_MODE_SHIFT &
+ DW_VR_MII_PCS_MODE_MASK);
+ ret |= (DW_VR_MII_TX_CONFIG_MAC_SIDE_SGMII <<
+ DW_VR_MII_AN_CTRL_TX_CONFIG_SHIFT &
+ DW_VR_MII_TX_CONFIG_MASK);
+ ret = xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_AN_CTRL, ret);
+ if (ret < 0)
+ return ret;
+
+ ret = xpcs_read(xpcs, MDIO_MMD_VEND2, DW_VR_MII_DIG_CTRL1);
+ if (ret < 0)
+ return ret;
+
+ ret |= DW_VR_MII_DIG_CTRL1_MAC_AUTO_SW;
+
+ return xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_DIG_CTRL1, ret);
+}
+
static int xpcs_config(struct mdio_xpcs_args *xpcs,
const struct phylink_link_state *state)
{
@@ -610,6 +704,11 @@ static int xpcs_config(struct mdio_xpcs_args *xpcs,
return ret;
}
break;
+ case DW_AN_C37_SGMII:
+ ret = xpcs_config_aneg_c37_sgmii(xpcs);
+ if (ret)
+ return ret;
+ break;
default:
return -1;
}
@@ -650,6 +749,47 @@ static int xpcs_get_state_c73(struct mdio_xpcs_args *xpcs,
return 0;
}
+static int xpcs_get_state_c37_sgmii(struct mdio_xpcs_args *xpcs,
+ struct phylink_link_state *state)
+{
+ int ret;
+
+ /* Reset link_state */
+ state->link = false;
+ state->speed = SPEED_UNKNOWN;
+ state->duplex = DUPLEX_UNKNOWN;
+ state->pause = 0;
+
+ /* For C37 SGMII mode, we check DW_VR_MII_AN_INTR_STS for link
+ * status, speed and duplex.
+ */
+ ret = xpcs_read(xpcs, MDIO_MMD_VEND2, DW_VR_MII_AN_INTR_STS);
+ if (ret < 0)
+ return false;
+
+ if (ret & DW_VR_MII_C37_ANSGM_SP_LNKSTS) {
+ int speed_value;
+
+ state->link = true;
+
+ speed_value = (ret & DW_VR_MII_AN_STS_C37_ANSGM_SP) >>
+ DW_VR_MII_AN_STS_C37_ANSGM_SP_SHIFT;
+ if (speed_value == DW_VR_MII_C37_ANSGM_SP_1000)
+ state->speed = SPEED_1000;
+ else if (speed_value == DW_VR_MII_C37_ANSGM_SP_100)
+ state->speed = SPEED_100;
+ else
+ state->speed = SPEED_10;
+
+ if (ret & DW_VR_MII_AN_STS_C37_ANSGM_FD)
+ state->duplex = DUPLEX_FULL;
+ else
+ state->duplex = DUPLEX_HALF;
+ }
+
+ return 0;
+}
+
static int xpcs_get_state(struct mdio_xpcs_args *xpcs,
struct phylink_link_state *state)
{
@@ -661,6 +801,11 @@ static int xpcs_get_state(struct mdio_xpcs_args *xpcs,
if (ret)
return ret;
break;
+ case DW_AN_C37_SGMII:
+ ret = xpcs_get_state_c37_sgmii(xpcs, state);
+ if (ret)
+ return ret;
+ break;
default:
return -1;
}
@@ -682,6 +827,7 @@ static u32 xpcs_get_id(struct mdio_xpcs_args *xpcs)
int ret;
u32 id;
+ /* First, search C73 PCS using PCS MMD */
ret = xpcs_read(xpcs, MDIO_MMD_PCS, MII_PHYSID1);
if (ret < 0)
return 0xffffffff;
@@ -692,7 +838,26 @@ static u32 xpcs_get_id(struct mdio_xpcs_args *xpcs)
if (ret < 0)
return 0xffffffff;
- return id | ret;
+ /* If Device IDs are not all zeros, we found C73 AN-type device */
+ if (id | ret)
+ return id | ret;
+
+ /* Next, search C37 PCS using Vendor-Specific MII MMD */
+ ret = xpcs_read(xpcs, MDIO_MMD_VEND2, MII_PHYSID1);
+ if (ret < 0)
+ return 0xffffffff;
+
+ id = ret << 16;
+
+ ret = xpcs_read(xpcs, MDIO_MMD_VEND2, MII_PHYSID2);
+ if (ret < 0)
+ return 0xffffffff;
+
+ /* If Device IDs are not all zeros, we found C37 AN-type device */
+ if (id | ret)
+ return id | ret;
+
+ return 0xffffffff;
}
static bool xpcs_check_features(struct mdio_xpcs_args *xpcs,
diff --git a/include/linux/pcs/pcs-xpcs.h b/include/linux/pcs/pcs-xpcs.h
index a04e57c25fea..2cb5188a7ef1 100644
--- a/include/linux/pcs/pcs-xpcs.h
+++ b/include/linux/pcs/pcs-xpcs.h
@@ -12,6 +12,7 @@
/* AN mode */
#define DW_AN_C73 1
+#define DW_AN_C37_SGMII 2
struct mdio_xpcs_args {
__ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
--
2.25.1