Merge branch 'net-dsa-qca8k-Improve-SGMII-interface-handling'

Jonathan McDowell says:

====================
net: dsa: qca8k: Improve SGMII interface handling

This 3 patch series migrates the qca8k switch driver over to PHYLINK,
and then adds the SGMII clean-ups (i.e. the missing initialisation) on
top of that as a second patch. The final patch is a simple spelling fix
in a comment.

As before, tested with a device where the CPU connection is RGMII (i.e.
the common current use case) + one where the CPU connection is SGMII. I
don't have any devices where the SGMII interface is brought out to
something other than the CPU.

v5:
- Move spelling fix to separate patch
- Use ds directly rather than ds->priv
v4:
- Enable pcs_poll so we keep phylink updated when doing in-band
  negotiation
- Explicitly check for PHY_INTERFACE_MODE_1000BASEX when setting SGMII
  port mode.
- Address Vladimir's review comments
v3:
- Move phylink changes to separate patch
- Address rmk review comments
v2:
- Switch to phylink
- Avoid need for device tree configuration options
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/qca8k.c

@@ -14,6 +14,7 @@
 #include <linux/of_platform.h>
 #include <linux/if_bridge.h>
 #include <linux/mdio.h>
+#include <linux/phylink.h>
 #include <linux/gpio/consumer.h>
 #include <linux/etherdevice.h>
 
@@ -418,55 +419,6 @@ qca8k_mib_init(struct qca8k_priv *priv)
 	mutex_unlock(&priv->reg_mutex);
 }
 
-static int
-qca8k_set_pad_ctrl(struct qca8k_priv *priv, int port, int mode)
-{
-	u32 reg, val;
-
-	switch (port) {
-	case 0:
-		reg = QCA8K_REG_PORT0_PAD_CTRL;
-		break;
-	case 6:
-		reg = QCA8K_REG_PORT6_PAD_CTRL;
-		break;
-	default:
-		pr_err("Can't set PAD_CTRL on port %d\n", port);
-		return -EINVAL;
-	}
-
-	/* Configure a port to be directly connected to an external
-	 * PHY or MAC.
-	 */
-	switch (mode) {
-	case PHY_INTERFACE_MODE_RGMII:
-		/* RGMII mode means no delay so don't enable the delay */
-		val = QCA8K_PORT_PAD_RGMII_EN;
-		qca8k_write(priv, reg, val);
-		break;
-	case PHY_INTERFACE_MODE_RGMII_ID:
-		/* RGMII_ID needs internal delay. This is enabled through
-		 * PORT5_PAD_CTRL for all ports, rather than individual port
-		 * registers
-		 */
-		qca8k_write(priv, reg,
-			    QCA8K_PORT_PAD_RGMII_EN |
-			    QCA8K_PORT_PAD_RGMII_TX_DELAY(QCA8K_MAX_DELAY) |
-			    QCA8K_PORT_PAD_RGMII_RX_DELAY(QCA8K_MAX_DELAY));
-		qca8k_write(priv, QCA8K_REG_PORT5_PAD_CTRL,
-			    QCA8K_PORT_PAD_RGMII_RX_DELAY_EN);
-		break;
-	case PHY_INTERFACE_MODE_SGMII:
-		qca8k_write(priv, reg, QCA8K_PORT_PAD_SGMII_EN);
-		break;
-	default:
-		pr_err("xMII mode %d not supported\n", mode);
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
 static void
 qca8k_port_set_status(struct qca8k_priv *priv, int port, int enable)
 {
@@ -639,9 +591,7 @@ static int
 qca8k_setup(struct dsa_switch *ds)
 {
 	struct qca8k_priv *priv = (struct qca8k_priv *)ds->priv;
-	phy_interface_t phy_mode = PHY_INTERFACE_MODE_NA;
 	int ret, i;
-	u32 mask;
 
 	/* Make sure that port 0 is the cpu port */
 	if (!dsa_is_cpu_port(ds, 0)) {
@@ -661,24 +611,9 @@ qca8k_setup(struct dsa_switch *ds)
 	if (ret)
 		return ret;
 
-	/* Initialize CPU port pad mode (xMII type, delays...) */
-	ret = of_get_phy_mode(dsa_to_port(ds, QCA8K_CPU_PORT)->dn, &phy_mode);
-	if (ret) {
-		pr_err("Can't find phy-mode for master device\n");
-		return ret;
-	}
-	ret = qca8k_set_pad_ctrl(priv, QCA8K_CPU_PORT, phy_mode);
-	if (ret < 0)
-		return ret;
-
-	/* Enable CPU Port, force it to maximum bandwidth and full-duplex */
-	mask = QCA8K_PORT_STATUS_SPEED_1000 | QCA8K_PORT_STATUS_TXFLOW |
-	       QCA8K_PORT_STATUS_RXFLOW | QCA8K_PORT_STATUS_DUPLEX;
-	qca8k_write(priv, QCA8K_REG_PORT_STATUS(QCA8K_CPU_PORT), mask);
+	/* Enable CPU Port */
 	qca8k_reg_set(priv, QCA8K_REG_GLOBAL_FW_CTRL0,
 		      QCA8K_GLOBAL_FW_CTRL0_CPU_PORT_EN);
-	qca8k_port_set_status(priv, QCA8K_CPU_PORT, 1);
-	priv->port_sts[QCA8K_CPU_PORT].enabled = 1;
 
 	/* Enable MIB counters */
 	qca8k_mib_init(priv);
@@ -693,10 +628,9 @@ qca8k_setup(struct dsa_switch *ds)
 		qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(i),
 			  QCA8K_PORT_LOOKUP_MEMBER, 0);
 
-	/* Disable MAC by default on all user ports */
+	/* Disable MAC by default on all ports */
 	for (i = 1; i < QCA8K_NUM_PORTS; i++)
-		if (dsa_is_user_port(ds, i))
-			qca8k_port_set_status(priv, i, 0);
+		qca8k_port_set_status(priv, i, 0);
 
 	/* Forward all unknown frames to CPU port for Linux processing */
 	qca8k_write(priv, QCA8K_REG_GLOBAL_FW_CTRL1,
@@ -713,7 +647,7 @@ qca8k_setup(struct dsa_switch *ds)
 				  QCA8K_PORT_LOOKUP_MEMBER, dsa_user_ports(ds));
 		}
 
-		/* Invividual user ports get connected to CPU port only */
+		/* Individual user ports get connected to CPU port only */
 		if (dsa_is_user_port(ds, i)) {
 			int shift = 16 * (i % 2);
 
@@ -739,48 +673,257 @@ qca8k_setup(struct dsa_switch *ds)
 	/* Flush the FDB table */
 	qca8k_fdb_flush(priv);
 
+	/* We don't have interrupts for link changes, so we need to poll */
+	ds->pcs_poll = true;
+
 	return 0;
 }
 
 static void
-qca8k_adjust_link(struct dsa_switch *ds, int port, struct phy_device *phy)
+qca8k_phylink_mac_config(struct dsa_switch *ds, int port, unsigned int mode,
+			 const struct phylink_link_state *state)
 {
 	struct qca8k_priv *priv = ds->priv;
-	u32 reg;
+	u32 reg, val;
+
+	switch (port) {
+	case 0: /* 1st CPU port */
+		if (state->interface != PHY_INTERFACE_MODE_RGMII &&
+		    state->interface != PHY_INTERFACE_MODE_RGMII_ID &&
+		    state->interface != PHY_INTERFACE_MODE_SGMII)
+			return;
+
+		reg = QCA8K_REG_PORT0_PAD_CTRL;
+		break;
+	case 1:
+	case 2:
+	case 3:
+	case 4:
+	case 5:
+		/* Internal PHY, nothing to do */
+		return;
+	case 6: /* 2nd CPU port / external PHY */
+		if (state->interface != PHY_INTERFACE_MODE_RGMII &&
+		    state->interface != PHY_INTERFACE_MODE_RGMII_ID &&
+		    state->interface != PHY_INTERFACE_MODE_SGMII &&
+		    state->interface != PHY_INTERFACE_MODE_1000BASEX)
+			return;
+
+		reg = QCA8K_REG_PORT6_PAD_CTRL;
+		break;
+	default:
+		dev_err(ds->dev, "%s: unsupported port: %i\n", __func__, port);
+		return;
+	}
+
+	if (port != 6 && phylink_autoneg_inband(mode)) {
+		dev_err(ds->dev, "%s: in-band negotiation unsupported\n",
+			__func__);
+		return;
+	}
+
+	switch (state->interface) {
+	case PHY_INTERFACE_MODE_RGMII:
+		/* RGMII mode means no delay so don't enable the delay */
+		qca8k_write(priv, reg, QCA8K_PORT_PAD_RGMII_EN);
+		break;
+	case PHY_INTERFACE_MODE_RGMII_ID:
+		/* RGMII_ID needs internal delay. This is enabled through
+		 * PORT5_PAD_CTRL for all ports, rather than individual port
+		 * registers
+		 */
+		qca8k_write(priv, reg,
+			    QCA8K_PORT_PAD_RGMII_EN |
+			    QCA8K_PORT_PAD_RGMII_TX_DELAY(QCA8K_MAX_DELAY) |
+			    QCA8K_PORT_PAD_RGMII_RX_DELAY(QCA8K_MAX_DELAY));
+		qca8k_write(priv, QCA8K_REG_PORT5_PAD_CTRL,
+			    QCA8K_PORT_PAD_RGMII_RX_DELAY_EN);
+		break;
+	case PHY_INTERFACE_MODE_SGMII:
+	case PHY_INTERFACE_MODE_1000BASEX:
+		/* Enable SGMII on the port */
+		qca8k_write(priv, reg, QCA8K_PORT_PAD_SGMII_EN);
 
-	/* Force fixed-link setting for CPU port, skip others. */
-	if (!phy_is_pseudo_fixed_link(phy))
+		/* Enable/disable SerDes auto-negotiation as necessary */
+		val = qca8k_read(priv, QCA8K_REG_PWS);
+		if (phylink_autoneg_inband(mode))
+			val &= ~QCA8K_PWS_SERDES_AEN_DIS;
+		else
+			val |= QCA8K_PWS_SERDES_AEN_DIS;
+		qca8k_write(priv, QCA8K_REG_PWS, val);
+
+		/* Configure the SGMII parameters */
+		val = qca8k_read(priv, QCA8K_REG_SGMII_CTRL);
+
+		val |= QCA8K_SGMII_EN_PLL | QCA8K_SGMII_EN_RX |
+			QCA8K_SGMII_EN_TX | QCA8K_SGMII_EN_SD;
+
+		if (dsa_is_cpu_port(ds, port)) {
+			/* CPU port, we're talking to the CPU MAC, be a PHY */
+			val &= ~QCA8K_SGMII_MODE_CTRL_MASK;
+			val |= QCA8K_SGMII_MODE_CTRL_PHY;
+		} else if (state->interface == PHY_INTERFACE_MODE_SGMII) {
+			val &= ~QCA8K_SGMII_MODE_CTRL_MASK;
+			val |= QCA8K_SGMII_MODE_CTRL_MAC;
+		} else if (state->interface == PHY_INTERFACE_MODE_1000BASEX) {
+			val &= ~QCA8K_SGMII_MODE_CTRL_MASK;
+			val |= QCA8K_SGMII_MODE_CTRL_BASEX;
+		}
+
+		qca8k_write(priv, QCA8K_REG_SGMII_CTRL, val);
+		break;
+	default:
+		dev_err(ds->dev, "xMII mode %s not supported for port %d\n",
+			phy_modes(state->interface), port);
 		return;
+	}
+}
 
-	/* Set port speed */
-	switch (phy->speed) {
-	case 10:
-		reg = QCA8K_PORT_STATUS_SPEED_10;
+static void
+qca8k_phylink_validate(struct dsa_switch *ds, int port,
+		       unsigned long *supported,
+		       struct phylink_link_state *state)
+{
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
+
+	switch (port) {
+	case 0: /* 1st CPU port */
+		if (state->interface != PHY_INTERFACE_MODE_NA &&
+		    state->interface != PHY_INTERFACE_MODE_RGMII &&
+		    state->interface != PHY_INTERFACE_MODE_RGMII_ID &&
+		    state->interface != PHY_INTERFACE_MODE_SGMII)
+			goto unsupported;
 		break;
-	case 100:
-		reg = QCA8K_PORT_STATUS_SPEED_100;
+	case 1:
+	case 2:
+	case 3:
+	case 4:
+	case 5:
+		/* Internal PHY */
+		if (state->interface != PHY_INTERFACE_MODE_NA &&
+		    state->interface != PHY_INTERFACE_MODE_GMII)
+			goto unsupported;
 		break;
-	case 1000:
-		reg = QCA8K_PORT_STATUS_SPEED_1000;
+	case 6: /* 2nd CPU port / external PHY */
+		if (state->interface != PHY_INTERFACE_MODE_NA &&
+		    state->interface != PHY_INTERFACE_MODE_RGMII &&
+		    state->interface != PHY_INTERFACE_MODE_RGMII_ID &&
+		    state->interface != PHY_INTERFACE_MODE_SGMII &&
+		    state->interface != PHY_INTERFACE_MODE_1000BASEX)
+			goto unsupported;
 		break;
 	default:
-		dev_dbg(priv->dev, "port%d link speed %dMbps not supported.\n",
-			port, phy->speed);
+unsupported:
+		linkmode_zero(supported);
 		return;
 	}
 
-	/* Set duplex mode */
-	if (phy->duplex == DUPLEX_FULL)
-		reg |= QCA8K_PORT_STATUS_DUPLEX;
+	phylink_set_port_modes(mask);
+	phylink_set(mask, Autoneg);
 
-	/* Force flow control */
-	if (dsa_is_cpu_port(ds, port))
-		reg |= QCA8K_PORT_STATUS_RXFLOW | QCA8K_PORT_STATUS_TXFLOW;
+	phylink_set(mask, 1000baseT_Full);
+	phylink_set(mask, 10baseT_Half);
+	phylink_set(mask, 10baseT_Full);
+	phylink_set(mask, 100baseT_Half);
+	phylink_set(mask, 100baseT_Full);
+
+	if (state->interface == PHY_INTERFACE_MODE_1000BASEX)
+		phylink_set(mask, 1000baseX_Full);
+
+	phylink_set(mask, Pause);
+	phylink_set(mask, Asym_Pause);
+
+	linkmode_and(supported, supported, mask);
+	linkmode_and(state->advertising, state->advertising, mask);
+}
+
+static int
+qca8k_phylink_mac_link_state(struct dsa_switch *ds, int port,
+			     struct phylink_link_state *state)
+{
+	struct qca8k_priv *priv = ds->priv;
+	u32 reg;
+
+	reg = qca8k_read(priv, QCA8K_REG_PORT_STATUS(port));
+
+	state->link = !!(reg & QCA8K_PORT_STATUS_LINK_UP);
+	state->an_complete = state->link;
+	state->an_enabled = !!(reg & QCA8K_PORT_STATUS_LINK_AUTO);
+	state->duplex = (reg & QCA8K_PORT_STATUS_DUPLEX) ? DUPLEX_FULL :
+							   DUPLEX_HALF;
+
+	switch (reg & QCA8K_PORT_STATUS_SPEED) {
+	case QCA8K_PORT_STATUS_SPEED_10:
+		state->speed = SPEED_10;
+		break;
+	case QCA8K_PORT_STATUS_SPEED_100:
+		state->speed = SPEED_100;
+		break;
+	case QCA8K_PORT_STATUS_SPEED_1000:
+		state->speed = SPEED_1000;
+		break;
+	default:
+		state->speed = SPEED_UNKNOWN;
+		break;
+	}
+
+	state->pause = MLO_PAUSE_NONE;
+	if (reg & QCA8K_PORT_STATUS_RXFLOW)
+		state->pause |= MLO_PAUSE_RX;
+	if (reg & QCA8K_PORT_STATUS_TXFLOW)
+		state->pause |= MLO_PAUSE_TX;
+
+	return 1;
+}
+
+static void
+qca8k_phylink_mac_link_down(struct dsa_switch *ds, int port, unsigned int mode,
+			    phy_interface_t interface)
+{
+	struct qca8k_priv *priv = ds->priv;
 
-	/* Force link down before changing MAC options */
 	qca8k_port_set_status(priv, port, 0);
+}
+
+static void
+qca8k_phylink_mac_link_up(struct dsa_switch *ds, int port, unsigned int mode,
+			  phy_interface_t interface, struct phy_device *phydev,
+			  int speed, int duplex, bool tx_pause, bool rx_pause)
+{
+	struct qca8k_priv *priv = ds->priv;
+	u32 reg;
+
+	if (phylink_autoneg_inband(mode)) {
+		reg = QCA8K_PORT_STATUS_LINK_AUTO;
+	} else {
+		switch (speed) {
+		case SPEED_10:
+			reg = QCA8K_PORT_STATUS_SPEED_10;
+			break;
+		case SPEED_100:
+			reg = QCA8K_PORT_STATUS_SPEED_100;
+			break;
+		case SPEED_1000:
+			reg = QCA8K_PORT_STATUS_SPEED_1000;
+			break;
+		default:
+			reg = QCA8K_PORT_STATUS_LINK_AUTO;
+			break;
+		}
+
+		if (duplex == DUPLEX_FULL)
+			reg |= QCA8K_PORT_STATUS_DUPLEX;
+
+		if (rx_pause || dsa_is_cpu_port(ds, port))
+			reg |= QCA8K_PORT_STATUS_RXFLOW;
+
+		if (tx_pause || dsa_is_cpu_port(ds, port))
+			reg |= QCA8K_PORT_STATUS_TXFLOW;
+	}
+
+	reg |= QCA8K_PORT_STATUS_TXMAC | QCA8K_PORT_STATUS_RXMAC;
+
 	qca8k_write(priv, QCA8K_REG_PORT_STATUS(port), reg);
-	qca8k_port_set_status(priv, port, 1);
 }
 
 static void
@@ -937,13 +1080,11 @@ qca8k_port_enable(struct dsa_switch *ds, int port,
 {
 	struct qca8k_priv *priv = (struct qca8k_priv *)ds->priv;
 
-	if (!dsa_is_user_port(ds, port))
-		return 0;
-
 	qca8k_port_set_status(priv, port, 1);
 	priv->port_sts[port].enabled = 1;
 
-	phy_support_asym_pause(phy);
+	if (dsa_is_user_port(ds, port))
+		phy_support_asym_pause(phy);
 
 	return 0;
 }
@@ -1026,7 +1167,6 @@ qca8k_get_tag_protocol(struct dsa_switch *ds, int port,
 static const struct dsa_switch_ops qca8k_switch_ops = {
 	.get_tag_protocol	= qca8k_get_tag_protocol,
 	.setup			= qca8k_setup,
-	.adjust_link            = qca8k_adjust_link,
 	.get_strings		= qca8k_get_strings,
 	.get_ethtool_stats	= qca8k_get_ethtool_stats,
 	.get_sset_count		= qca8k_get_sset_count,
@@ -1040,6 +1180,11 @@ static const struct dsa_switch_ops qca8k_switch_ops = {
 	.port_fdb_add		= qca8k_port_fdb_add,
 	.port_fdb_del		= qca8k_port_fdb_del,
 	.port_fdb_dump		= qca8k_port_fdb_dump,
+	.phylink_validate	= qca8k_phylink_validate,
+	.phylink_mac_link_state	= qca8k_phylink_mac_link_state,
+	.phylink_mac_config	= qca8k_phylink_mac_config,
+	.phylink_mac_link_down	= qca8k_phylink_mac_link_down,
+	.phylink_mac_link_up	= qca8k_phylink_mac_link_up,
 };
 
 static int

drivers/net/dsa/qca8k.h

@@ -36,6 +36,8 @@
 #define   QCA8K_MAX_DELAY				3
 #define   QCA8K_PORT_PAD_RGMII_RX_DELAY_EN		BIT(24)
 #define   QCA8K_PORT_PAD_SGMII_EN			BIT(7)
+#define QCA8K_REG_PWS					0x010
+#define   QCA8K_PWS_SERDES_AEN_DIS			BIT(7)
 #define QCA8K_REG_MODULE_EN				0x030
 #define   QCA8K_MODULE_EN_MIB				BIT(0)
 #define QCA8K_REG_MIB					0x034
@@ -69,6 +71,7 @@
 #define   QCA8K_PORT_STATUS_LINK_UP			BIT(8)
 #define   QCA8K_PORT_STATUS_LINK_AUTO			BIT(9)
 #define   QCA8K_PORT_STATUS_LINK_PAUSE			BIT(10)
+#define   QCA8K_PORT_STATUS_FLOW_AUTO			BIT(12)
 #define QCA8K_REG_PORT_HDR_CTRL(_i)			(0x9c + (_i * 4))
 #define   QCA8K_PORT_HDR_CTRL_RX_MASK			GENMASK(3, 2)
 #define   QCA8K_PORT_HDR_CTRL_RX_S			2
@@ -77,6 +80,16 @@
 #define   QCA8K_PORT_HDR_CTRL_ALL			2
 #define   QCA8K_PORT_HDR_CTRL_MGMT			1
 #define   QCA8K_PORT_HDR_CTRL_NONE			0
+#define QCA8K_REG_SGMII_CTRL				0x0e0
+#define   QCA8K_SGMII_EN_PLL				BIT(1)
+#define   QCA8K_SGMII_EN_RX				BIT(2)
+#define   QCA8K_SGMII_EN_TX				BIT(3)
+#define   QCA8K_SGMII_EN_SD				BIT(4)
+#define   QCA8K_SGMII_CLK125M_DELAY			BIT(7)
+#define   QCA8K_SGMII_MODE_CTRL_MASK			(BIT(22) | BIT(23))
+#define   QCA8K_SGMII_MODE_CTRL_BASEX			(0 << 22)
+#define   QCA8K_SGMII_MODE_CTRL_PHY			(1 << 22)
+#define   QCA8K_SGMII_MODE_CTRL_MAC			(2 << 22)
 
 /* EEE control registers */
 #define QCA8K_REG_EEE_CTRL				0x100