amd-xgbe: Add support for 10 Mbps speed

Add the necessary changes to support 10 Mbps speed for BaseT and SFP
port modes. This is supported in MAC ver >= 30H.

Signed-off-by: Raju Rangoju <Raju.Rangoju@amd.com>
Link: https://lore.kernel.org/r/20230109101819.747572-1-Raju.Rangoju@amd.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

4 files changed, 126 insertions, 10 deletions

diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
index 3936543a74d8..e033d6c819f3 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
@@ -807,6 +807,9 @@ static int xgbe_set_speed(struct xgbe_prv_data *pdata, int speed)
 	unsigned int ss;
 
 	switch (speed) {
+	case SPEED_10:
+		ss = 0x07;
+		break;
 	case SPEED_1000:
 		ss = 0x03;
 		break;
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c b/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c
index 0c5c1b155683..cde0f86791b6 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c
@@ -274,6 +274,15 @@ static void xgbe_sgmii_1000_mode(struct xgbe_prv_data *pdata)
 	pdata->phy_if.phy_impl.set_mode(pdata, XGBE_MODE_SGMII_1000);
 }
 
+static void xgbe_sgmii_10_mode(struct xgbe_prv_data *pdata)
+{
+	/* Set MAC to 10M speed */
+	pdata->hw_if.set_speed(pdata, SPEED_10);
+
+	/* Call PHY implementation support to complete rate change */
+	pdata->phy_if.phy_impl.set_mode(pdata, XGBE_MODE_SGMII_10);
+}
+
 static void xgbe_sgmii_100_mode(struct xgbe_prv_data *pdata)
 {
 	/* Set MAC to 1G speed */
@@ -306,6 +315,9 @@ static void xgbe_change_mode(struct xgbe_prv_data *pdata,
 	case XGBE_MODE_KR:
 		xgbe_kr_mode(pdata);
 		break;
+	case XGBE_MODE_SGMII_10:
+		xgbe_sgmii_10_mode(pdata);
+		break;
 	case XGBE_MODE_SGMII_100:
 		xgbe_sgmii_100_mode(pdata);
 		break;
@@ -1074,6 +1086,8 @@ static const char *xgbe_phy_fc_string(struct xgbe_prv_data *pdata)
 static const char *xgbe_phy_speed_string(int speed)
 {
 	switch (speed) {
+	case SPEED_10:
+		return "10Mbps";
 	case SPEED_100:
 		return "100Mbps";
 	case SPEED_1000:
@@ -1161,6 +1175,7 @@ static int xgbe_phy_config_fixed(struct xgbe_prv_data *pdata)
 	case XGBE_MODE_KX_1000:
 	case XGBE_MODE_KX_2500:
 	case XGBE_MODE_KR:
+	case XGBE_MODE_SGMII_10:
 	case XGBE_MODE_SGMII_100:
 	case XGBE_MODE_SGMII_1000:
 	case XGBE_MODE_X:
@@ -1222,6 +1237,8 @@ static int __xgbe_phy_config_aneg(struct xgbe_prv_data *pdata, bool set_mode)
 			xgbe_set_mode(pdata, XGBE_MODE_SGMII_1000);
 		} else if (xgbe_use_mode(pdata, XGBE_MODE_SGMII_100)) {
 			xgbe_set_mode(pdata, XGBE_MODE_SGMII_100);
+		} else if (xgbe_use_mode(pdata, XGBE_MODE_SGMII_10)) {
+			xgbe_set_mode(pdata, XGBE_MODE_SGMII_10);
 		} else {
 			enable_irq(pdata->an_irq);
 			ret = -EINVAL;
@@ -1301,6 +1318,9 @@ static void xgbe_phy_status_result(struct xgbe_prv_data *pdata)
 		mode = xgbe_phy_status_aneg(pdata);
 
 	switch (mode) {
+	case XGBE_MODE_SGMII_10:
+		pdata->phy.speed = SPEED_10;
+		break;
 	case XGBE_MODE_SGMII_100:
 		pdata->phy.speed = SPEED_100;
 		break;
@@ -1443,6 +1463,8 @@ static int xgbe_phy_start(struct xgbe_prv_data *pdata)
 		xgbe_sgmii_1000_mode(pdata);
 	} else if (xgbe_use_mode(pdata, XGBE_MODE_SGMII_100)) {
 		xgbe_sgmii_100_mode(pdata);
+	} else if (xgbe_use_mode(pdata, XGBE_MODE_SGMII_10)) {
+		xgbe_sgmii_10_mode(pdata);
 	} else {
 		ret = -EINVAL;
 		goto err_irq;
@@ -1540,6 +1562,8 @@ static int xgbe_phy_best_advertised_speed(struct xgbe_prv_data *pdata)
 		return SPEED_1000;
 	else if (XGBE_ADV(lks, 100baseT_Full))
 		return SPEED_100;
+	else if (XGBE_ADV(lks, 10baseT_Full))
+		return SPEED_10;
 
 	return SPEED_UNKNOWN;
 }
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c b/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
index c731a04731f8..de7118cb10b8 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
@@ -124,6 +124,7 @@
 #include "xgbe.h"
 #include "xgbe-common.h"
 
+#define XGBE_PHY_PORT_SPEED_10		BIT(0)
 #define XGBE_PHY_PORT_SPEED_100		BIT(1)
 #define XGBE_PHY_PORT_SPEED_1000	BIT(2)
 #define XGBE_PHY_PORT_SPEED_2500	BIT(3)
@@ -759,6 +760,8 @@ static void xgbe_phy_sfp_phy_settings(struct xgbe_prv_data *pdata)
 		XGBE_SET_SUP(lks, Pause);
 		XGBE_SET_SUP(lks, Asym_Pause);
 		if (phy_data->sfp_base == XGBE_SFP_BASE_1000_T) {
+			if (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_10)
+				XGBE_SET_SUP(lks, 10baseT_Full);
 			if (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_100)
 				XGBE_SET_SUP(lks, 100baseT_Full);
 			if (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_1000)
@@ -1542,6 +1545,16 @@ static enum xgbe_mode xgbe_phy_an37_sgmii_outcome(struct xgbe_prv_data *pdata)
 		xgbe_phy_phydev_flowctrl(pdata);
 
 	switch (pdata->an_status & XGBE_SGMII_AN_LINK_SPEED) {
+	case XGBE_SGMII_AN_LINK_SPEED_10:
+		if (pdata->an_status & XGBE_SGMII_AN_LINK_DUPLEX) {
+			XGBE_SET_LP_ADV(lks, 10baseT_Full);
+			mode = XGBE_MODE_SGMII_10;
+		} else {
+			/* Half-duplex not supported */
+			XGBE_SET_LP_ADV(lks, 10baseT_Half);
+			mode = XGBE_MODE_UNKNOWN;
+		}
+		break;
 	case XGBE_SGMII_AN_LINK_SPEED_100:
 		if (pdata->an_status & XGBE_SGMII_AN_LINK_DUPLEX) {
 			XGBE_SET_LP_ADV(lks, 100baseT_Full);
@@ -1658,7 +1671,10 @@ static enum xgbe_mode xgbe_phy_an73_redrv_outcome(struct xgbe_prv_data *pdata)
 			switch (phy_data->sfp_base) {
 			case XGBE_SFP_BASE_1000_T:
 				if (phy_data->phydev &&
-				    (phy_data->phydev->speed == SPEED_100))
+				    (phy_data->phydev->speed == SPEED_10))
+					mode = XGBE_MODE_SGMII_10;
+				else if (phy_data->phydev &&
+					 (phy_data->phydev->speed == SPEED_100))
 					mode = XGBE_MODE_SGMII_100;
 				else
 					mode = XGBE_MODE_SGMII_1000;
@@ -1673,7 +1689,10 @@ static enum xgbe_mode xgbe_phy_an73_redrv_outcome(struct xgbe_prv_data *pdata)
 			break;
 		default:
 			if (phy_data->phydev &&
-			    (phy_data->phydev->speed == SPEED_100))
+			    (phy_data->phydev->speed == SPEED_10))
+				mode = XGBE_MODE_SGMII_10;
+			else if (phy_data->phydev &&
+				 (phy_data->phydev->speed == SPEED_100))
 				mode = XGBE_MODE_SGMII_100;
 			else
 				mode = XGBE_MODE_SGMII_1000;
@@ -2127,6 +2146,20 @@ static void xgbe_phy_sgmii_100_mode(struct xgbe_prv_data *pdata)
 	netif_dbg(pdata, link, pdata->netdev, "100MbE SGMII mode set\n");
 }
 
+static void xgbe_phy_sgmii_10_mode(struct xgbe_prv_data *pdata)
+{
+	struct xgbe_phy_data *phy_data = pdata->phy_data;
+
+	xgbe_phy_set_redrv_mode(pdata);
+
+	/* 10M/SGMII */
+	xgbe_phy_perform_ratechange(pdata, XGBE_MB_CMD_SET_1G, XGBE_MB_SUBCMD_10MBITS);
+
+	phy_data->cur_mode = XGBE_MODE_SGMII_10;
+
+	netif_dbg(pdata, link, pdata->netdev, "10MbE SGMII mode set\n");
+}
+
 static void xgbe_phy_kr_mode(struct xgbe_prv_data *pdata)
 {
 	struct xgbe_phy_data *phy_data = pdata->phy_data;
@@ -2185,6 +2218,7 @@ static enum xgbe_mode xgbe_phy_switch_baset_mode(struct xgbe_prv_data *pdata)
 		return xgbe_phy_cur_mode(pdata);
 
 	switch (xgbe_phy_cur_mode(pdata)) {
+	case XGBE_MODE_SGMII_10:
 	case XGBE_MODE_SGMII_100:
 	case XGBE_MODE_SGMII_1000:
 		return XGBE_MODE_KR;
@@ -2252,6 +2286,8 @@ static enum xgbe_mode xgbe_phy_get_baset_mode(struct xgbe_phy_data *phy_data,
 					      int speed)
 {
 	switch (speed) {
+	case SPEED_10:
+		return XGBE_MODE_SGMII_10;
 	case SPEED_100:
 		return XGBE_MODE_SGMII_100;
 	case SPEED_1000:
@@ -2269,6 +2305,8 @@ static enum xgbe_mode xgbe_phy_get_sfp_mode(struct xgbe_phy_data *phy_data,
 					    int speed)
 {
 	switch (speed) {
+	case SPEED_10:
+		return XGBE_MODE_SGMII_10;
 	case SPEED_100:
 		return XGBE_MODE_SGMII_100;
 	case SPEED_1000:
@@ -2343,6 +2381,9 @@ static void xgbe_phy_set_mode(struct xgbe_prv_data *pdata, enum xgbe_mode mode)
 	case XGBE_MODE_KR:
 		xgbe_phy_kr_mode(pdata);
 		break;
+	case XGBE_MODE_SGMII_10:
+		xgbe_phy_sgmii_10_mode(pdata);
+		break;
 	case XGBE_MODE_SGMII_100:
 		xgbe_phy_sgmii_100_mode(pdata);
 		break;
@@ -2399,6 +2440,9 @@ static bool xgbe_phy_use_baset_mode(struct xgbe_prv_data *pdata,
 	struct ethtool_link_ksettings *lks = &pdata->phy.lks;
 
 	switch (mode) {
+	case XGBE_MODE_SGMII_10:
+		return xgbe_phy_check_mode(pdata, mode,
+					   XGBE_ADV(lks, 10baseT_Full));
 	case XGBE_MODE_SGMII_100:
 		return xgbe_phy_check_mode(pdata, mode,
 					   XGBE_ADV(lks, 100baseT_Full));
@@ -2428,6 +2472,11 @@ static bool xgbe_phy_use_sfp_mode(struct xgbe_prv_data *pdata,
 			return false;
 		return xgbe_phy_check_mode(pdata, mode,
 					   XGBE_ADV(lks, 1000baseX_Full));
+	case XGBE_MODE_SGMII_10:
+		if (phy_data->sfp_base != XGBE_SFP_BASE_1000_T)
+			return false;
+		return xgbe_phy_check_mode(pdata, mode,
+					   XGBE_ADV(lks, 10baseT_Full));
 	case XGBE_MODE_SGMII_100:
 		if (phy_data->sfp_base != XGBE_SFP_BASE_1000_T)
 			return false;
@@ -2520,10 +2569,17 @@ static bool xgbe_phy_valid_speed_basex_mode(struct xgbe_phy_data *phy_data,
 	}
 }
 
-static bool xgbe_phy_valid_speed_baset_mode(struct xgbe_phy_data *phy_data,
+static bool xgbe_phy_valid_speed_baset_mode(struct xgbe_prv_data *pdata,
 					    int speed)
 {
+	struct xgbe_phy_data *phy_data = pdata->phy_data;
+	unsigned int ver;
+
 	switch (speed) {
+	case SPEED_10:
+		/* Supported in ver >= 30H */
+		ver = XGMAC_GET_BITS(pdata->hw_feat.version, MAC_VR, SNPSVER);
+		return (ver >= 0x30) ? true : false;
 	case SPEED_100:
 	case SPEED_1000:
 		return true;
@@ -2536,10 +2592,17 @@ static bool xgbe_phy_valid_speed_baset_mode(struct xgbe_phy_data *phy_data,
 	}
 }
 
-static bool xgbe_phy_valid_speed_sfp_mode(struct xgbe_phy_data *phy_data,
+static bool xgbe_phy_valid_speed_sfp_mode(struct xgbe_prv_data *pdata,
 					  int speed)
 {
+	struct xgbe_phy_data *phy_data = pdata->phy_data;
+	unsigned int ver;
+
 	switch (speed) {
+	case SPEED_10:
+		/* Supported in ver >= 30H */
+		ver = XGMAC_GET_BITS(pdata->hw_feat.version, MAC_VR, SNPSVER);
+		return (ver >= 0x30) && (phy_data->sfp_speed == XGBE_SFP_SPEED_100_1000);
 	case SPEED_100:
 		return (phy_data->sfp_speed == XGBE_SFP_SPEED_100_1000);
 	case SPEED_1000:
@@ -2586,12 +2649,12 @@ static bool xgbe_phy_valid_speed(struct xgbe_prv_data *pdata, int speed)
 	case XGBE_PORT_MODE_1000BASE_T:
 	case XGBE_PORT_MODE_NBASE_T:
 	case XGBE_PORT_MODE_10GBASE_T:
-		return xgbe_phy_valid_speed_baset_mode(phy_data, speed);
+		return xgbe_phy_valid_speed_baset_mode(pdata, speed);
 	case XGBE_PORT_MODE_1000BASE_X:
 	case XGBE_PORT_MODE_10GBASE_R:
 		return xgbe_phy_valid_speed_basex_mode(phy_data, speed);
 	case XGBE_PORT_MODE_SFP:
-		return xgbe_phy_valid_speed_sfp_mode(phy_data, speed);
+		return xgbe_phy_valid_speed_sfp_mode(pdata, speed);
 	default:
 		return false;
 	}
@@ -2862,6 +2925,12 @@ static int xgbe_phy_mdio_reset_setup(struct xgbe_prv_data *pdata)
 static bool xgbe_phy_port_mode_mismatch(struct xgbe_prv_data *pdata)
 {
 	struct xgbe_phy_data *phy_data = pdata->phy_data;
+	unsigned int ver;
+
+	/* 10 Mbps speed is not supported in ver < 30H */
+	ver = XGMAC_GET_BITS(pdata->hw_feat.version, MAC_VR, SNPSVER);
+	if (ver < 0x30 && (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_10))
+		return true;
 
 	switch (phy_data->port_mode) {
 	case XGBE_PORT_MODE_BACKPLANE:
@@ -2875,7 +2944,8 @@ static bool xgbe_phy_port_mode_mismatch(struct xgbe_prv_data *pdata)
 			return false;
 		break;
 	case XGBE_PORT_MODE_1000BASE_T:
-		if ((phy_data->port_speeds & XGBE_PHY_PORT_SPEED_100) ||
+		if ((phy_data->port_speeds & XGBE_PHY_PORT_SPEED_10) ||
+		    (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_100) ||
 		    (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_1000))
 			return false;
 		break;
@@ -2884,13 +2954,15 @@ static bool xgbe_phy_port_mode_mismatch(struct xgbe_prv_data *pdata)
 			return false;
 		break;
 	case XGBE_PORT_MODE_NBASE_T:
-		if ((phy_data->port_speeds & XGBE_PHY_PORT_SPEED_100) ||
+		if ((phy_data->port_speeds & XGBE_PHY_PORT_SPEED_10) ||
+		    (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_100) ||
 		    (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_1000) ||
 		    (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_2500))
 			return false;
 		break;
 	case XGBE_PORT_MODE_10GBASE_T:
-		if ((phy_data->port_speeds & XGBE_PHY_PORT_SPEED_100) ||
+		if ((phy_data->port_speeds & XGBE_PHY_PORT_SPEED_10) ||
+		    (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_100) ||
 		    (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_1000) ||
 		    (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_10000))
 			return false;
@@ -2900,7 +2972,8 @@ static bool xgbe_phy_port_mode_mismatch(struct xgbe_prv_data *pdata)
 			return false;
 		break;
 	case XGBE_PORT_MODE_SFP:
-		if ((phy_data->port_speeds & XGBE_PHY_PORT_SPEED_100) ||
+		if ((phy_data->port_speeds & XGBE_PHY_PORT_SPEED_10) ||
+		    (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_100) ||
 		    (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_1000) ||
 		    (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_10000))
 			return false;
@@ -3269,6 +3342,10 @@ static int xgbe_phy_init(struct xgbe_prv_data *pdata)
 		XGBE_SET_SUP(lks, Pause);
 		XGBE_SET_SUP(lks, Asym_Pause);
 		XGBE_SET_SUP(lks, TP);
+		if (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_10) {
+			XGBE_SET_SUP(lks, 10baseT_Full);
+			phy_data->start_mode = XGBE_MODE_SGMII_10;
+		}
 		if (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_100) {
 			XGBE_SET_SUP(lks, 100baseT_Full);
 			phy_data->start_mode = XGBE_MODE_SGMII_100;
@@ -3299,6 +3376,10 @@ static int xgbe_phy_init(struct xgbe_prv_data *pdata)
 		XGBE_SET_SUP(lks, Pause);
 		XGBE_SET_SUP(lks, Asym_Pause);
 		XGBE_SET_SUP(lks, TP);
+		if (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_10) {
+			XGBE_SET_SUP(lks, 10baseT_Full);
+			phy_data->start_mode = XGBE_MODE_SGMII_10;
+		}
 		if (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_100) {
 			XGBE_SET_SUP(lks, 100baseT_Full);
 			phy_data->start_mode = XGBE_MODE_SGMII_100;
@@ -3321,6 +3402,10 @@ static int xgbe_phy_init(struct xgbe_prv_data *pdata)
 		XGBE_SET_SUP(lks, Pause);
 		XGBE_SET_SUP(lks, Asym_Pause);
 		XGBE_SET_SUP(lks, TP);
+		if (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_10) {
+			XGBE_SET_SUP(lks, 10baseT_Full);
+			phy_data->start_mode = XGBE_MODE_SGMII_10;
+		}
 		if (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_100) {
 			XGBE_SET_SUP(lks, 100baseT_Full);
 			phy_data->start_mode = XGBE_MODE_SGMII_100;
@@ -3361,6 +3446,8 @@ static int xgbe_phy_init(struct xgbe_prv_data *pdata)
 		XGBE_SET_SUP(lks, Asym_Pause);
 		XGBE_SET_SUP(lks, TP);
 		XGBE_SET_SUP(lks, FIBRE);
+		if (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_10)
+			phy_data->start_mode = XGBE_MODE_SGMII_10;
 		if (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_100)
 			phy_data->start_mode = XGBE_MODE_SGMII_100;
 		if (phy_data->port_speeds & XGBE_PHY_PORT_SPEED_1000)
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe.h b/drivers/net/ethernet/amd/xgbe/xgbe.h
index 71f24cb47935..da37476a2848 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe.h
+++ b/drivers/net/ethernet/amd/xgbe/xgbe.h
@@ -293,6 +293,7 @@
 
 #define XGBE_SGMII_AN_LINK_STATUS	BIT(1)
 #define XGBE_SGMII_AN_LINK_SPEED	(BIT(2) | BIT(3))
+#define XGBE_SGMII_AN_LINK_SPEED_10	0x00
 #define XGBE_SGMII_AN_LINK_SPEED_100	0x04
 #define XGBE_SGMII_AN_LINK_SPEED_1000	0x08
 #define XGBE_SGMII_AN_LINK_DUPLEX	BIT(4)
@@ -594,6 +595,7 @@ enum xgbe_mode {
 	XGBE_MODE_KX_2500,
 	XGBE_MODE_KR,
 	XGBE_MODE_X,
+	XGBE_MODE_SGMII_10,
 	XGBE_MODE_SGMII_100,
 	XGBE_MODE_SGMII_1000,
 	XGBE_MODE_SFI,