[PATCH net-next v3 0/5] net: dsa: b53: SerDes support

[PATCH net-next v3 0/5] net: dsa: b53: SerDes support

[Florian Fainelli]

Hi all,

This patch series adds support for the SerDes found on NorthStar Plus
(NSP) which allows us to use the SFP port on the BCM958625HR board (and
other similar designs).

Changes in v3:

- properly hunk the request_threaded_irq() bits into patch #2

Changes in v2:

- migrate to threaded interrupt (Andrew)
- fixed a case where MLO_AN_FIXED's mac_config would still call into
  the serdes_config callback
- added an additional check on the phylink interface in mac_config
- default to ARCH_BCM_NSP instead of ARCH_BCM_IPROC which is really
  the NSP Kconfig bit we want


Florian Fainelli (5):
  net: dsa: b53: Add ability to enable/disable port interrupts
  net: dsa: b53: Make SRAB driver manage port interrupts
  net: dsa: b53: Add helper to set link parameters
  net: dsa: b53: Add PHYLINK support
  net: dsa: b53: Add SerDes support

 drivers/net/dsa/b53/Kconfig      |   7 +
 drivers/net/dsa/b53/Makefile     |   1 +
 drivers/net/dsa/b53/b53_common.c | 246 +++++++++++++++++++++++++++----
 drivers/net/dsa/b53/b53_priv.h   |  36 +++++
 drivers/net/dsa/b53/b53_serdes.c | 217 +++++++++++++++++++++++++++
 drivers/net/dsa/b53/b53_serdes.h | 121 +++++++++++++++
 drivers/net/dsa/b53/b53_srab.c   | 206 ++++++++++++++++++++++++++
 7 files changed, 805 insertions(+), 29 deletions(-)
 create mode 100644 drivers/net/dsa/b53/b53_serdes.c
 create mode 100644 drivers/net/dsa/b53/b53_serdes.h

-- 
2.17.1

[PATCH net-next v3 1/5] net: dsa: b53: Add ability to enable/disable port interrupts

[Florian Fainelli]

Some switches expose individual interrupt line(s) for port specific
event(s), allow configuring these interrupts at an appropriate time
during port_enable/disable callbacks where all port specific resources
are known to be set-up and ready for use.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/net/dsa/b53/b53_common.c | 9 +++++++++
 drivers/net/dsa/b53/b53_priv.h   | 2 ++
 2 files changed, 11 insertions(+)

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index d93c790bfbe8..85ed264bc163 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -502,8 +502,14 @@ int b53_enable_port(struct dsa_switch *ds, int port, struct phy_device *phy)
 {
 	struct b53_device *dev = ds->priv;
 	unsigned int cpu_port = ds->ports[port].cpu_dp->index;
+	int ret = 0;
 	u16 pvlan;
 
+	if (dev->ops->irq_enable)
+		ret = dev->ops->irq_enable(dev, port);
+	if (ret)
+		return ret;
+
 	/* Clear the Rx and Tx disable bits and set to no spanning tree */
 	b53_write8(dev, B53_CTRL_PAGE, B53_PORT_CTRL(port), 0);
 
@@ -536,6 +542,9 @@ void b53_disable_port(struct dsa_switch *ds, int port, struct phy_device *phy)
 	b53_read8(dev, B53_CTRL_PAGE, B53_PORT_CTRL(port), &reg);
 	reg |= PORT_CTRL_RX_DISABLE | PORT_CTRL_TX_DISABLE;
 	b53_write8(dev, B53_CTRL_PAGE, B53_PORT_CTRL(port), reg);
+
+	if (dev->ops->irq_disable)
+		dev->ops->irq_disable(dev, port);
 }
 EXPORT_SYMBOL(b53_disable_port);
 
diff --git a/drivers/net/dsa/b53/b53_priv.h b/drivers/net/dsa/b53/b53_priv.h
index df149756c282..2980a5838f58 100644
--- a/drivers/net/dsa/b53/b53_priv.h
+++ b/drivers/net/dsa/b53/b53_priv.h
@@ -43,6 +43,8 @@ struct b53_io_ops {
 	int (*write64)(struct b53_device *dev, u8 page, u8 reg, u64 value);
 	int (*phy_read16)(struct b53_device *dev, int addr, int reg, u16 *value);
 	int (*phy_write16)(struct b53_device *dev, int addr, int reg, u16 value);
+	int (*irq_enable)(struct b53_device *dev, int port);
+	void (*irq_disable)(struct b53_device *dev, int port);
 };
 
 enum {
-- 
2.17.1

Re: [PATCH net-next v3 1/5] net: dsa: b53: Add ability to enable/disable port interrupts

[Andrew Lunn]

On Wed, Sep 05, 2018 at 12:42:11PM -0700, Florian Fainelli wrote:
> Some switches expose individual interrupt line(s) for port specific
> event(s), allow configuring these interrupts at an appropriate time
> during port_enable/disable callbacks where all port specific resources
> are known to be set-up and ready for use.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

[PATCH net-next v3 2/5] net: dsa: b53: Make SRAB driver manage port interrupts

[Florian Fainelli]

Update the SRAB driver to manage per-port interrupts. Since we cannot
sleep during b53_io_ops, schedule a workqueue whenever we get a port
specific interrupt. We will later make use of this to call back into
PHYLINK when there is e.g: a link state change.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/net/dsa/b53/b53_srab.c | 105 +++++++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)

diff --git a/drivers/net/dsa/b53/b53_srab.c b/drivers/net/dsa/b53/b53_srab.c
index 91de2ba99ad1..645dde0d317d 100644
--- a/drivers/net/dsa/b53/b53_srab.c
+++ b/drivers/net/dsa/b53/b53_srab.c
@@ -19,6 +19,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/delay.h>
+#include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/platform_data/b53.h>
 #include <linux/of.h>
@@ -47,6 +48,7 @@
 
 /* command and status register of the SRAB */
 #define B53_SRAB_CTRLS			0x40
+#define  B53_SRAB_CTRLS_HOST_INTR	BIT(1)
 #define  B53_SRAB_CTRLS_RCAREQ		BIT(3)
 #define  B53_SRAB_CTRLS_RCAGNT		BIT(4)
 #define  B53_SRAB_CTRLS_SW_INIT_DONE	BIT(6)
@@ -60,8 +62,16 @@
 #define  B53_SRAB_P7_SLEEP_TIMER	BIT(11)
 #define  B53_SRAB_IMP0_SLEEP_TIMER	BIT(12)
 
+struct b53_srab_port_priv {
+	int irq;
+	bool irq_enabled;
+	struct b53_device *dev;
+	unsigned int num;
+};
+
 struct b53_srab_priv {
 	void __iomem *regs;
+	struct b53_srab_port_priv port_intrs[B53_N_PORTS];
 };
 
 static int b53_srab_request_grant(struct b53_device *dev)
@@ -344,6 +354,49 @@ static int b53_srab_write64(struct b53_device *dev, u8 page, u8 reg,
 	return ret;
 }
 
+static irqreturn_t b53_srab_port_thread(int irq, void *dev_id)
+{
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t b53_srab_port_isr(int irq, void *dev_id)
+{
+	struct b53_srab_port_priv *port = dev_id;
+	struct b53_device *dev = port->dev;
+	struct b53_srab_priv *priv = dev->priv;
+
+	/* Acknowledge the interrupt */
+	writel(BIT(port->num), priv->regs + B53_SRAB_INTR);
+
+	return IRQ_WAKE_THREAD;
+}
+
+static int b53_srab_irq_enable(struct b53_device *dev, int port)
+{
+	struct b53_srab_priv *priv = dev->priv;
+	struct b53_srab_port_priv *p = &priv->port_intrs[port];
+	int ret;
+
+	ret = request_threaded_irq(p->irq, b53_srab_port_isr,
+				   b53_srab_port_thread, 0,
+				   dev_name(dev->dev), p);
+	if (!ret)
+		p->irq_enabled = true;
+
+	return ret;
+}
+
+static void b53_srab_irq_disable(struct b53_device *dev, int port)
+{
+	struct b53_srab_priv *priv = dev->priv;
+	struct b53_srab_port_priv *p = &priv->port_intrs[port];
+
+	if (p->irq_enabled) {
+		free_irq(p->irq, p);
+		p->irq_enabled = false;
+	}
+}
+
 static const struct b53_io_ops b53_srab_ops = {
 	.read8 = b53_srab_read8,
 	.read16 = b53_srab_read16,
@@ -355,6 +408,8 @@ static const struct b53_io_ops b53_srab_ops = {
 	.write32 = b53_srab_write32,
 	.write48 = b53_srab_write48,
 	.write64 = b53_srab_write64,
+	.irq_enable = b53_srab_irq_enable,
+	.irq_disable = b53_srab_irq_disable,
 };
 
 static const struct of_device_id b53_srab_of_match[] = {
@@ -379,6 +434,52 @@ static const struct of_device_id b53_srab_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, b53_srab_of_match);
 
+static void b53_srab_intr_set(struct b53_srab_priv *priv, bool set)
+{
+	u32 reg;
+
+	reg = readl(priv->regs + B53_SRAB_CTRLS);
+	if (set)
+		reg |= B53_SRAB_CTRLS_HOST_INTR;
+	else
+		reg &= ~B53_SRAB_CTRLS_HOST_INTR;
+	writel(reg, priv->regs + B53_SRAB_CTRLS);
+}
+
+static void b53_srab_prepare_irq(struct platform_device *pdev)
+{
+	struct b53_device *dev = platform_get_drvdata(pdev);
+	struct b53_srab_priv *priv = dev->priv;
+	struct b53_srab_port_priv *port;
+	unsigned int i;
+	char *name;
+
+	/* Clear all pending interrupts */
+	writel(0xffffffff, priv->regs + B53_SRAB_INTR);
+
+	if (dev->pdata && dev->pdata->chip_id != BCM58XX_DEVICE_ID)
+		return;
+
+	for (i = 0; i < B53_N_PORTS; i++) {
+		port = &priv->port_intrs[i];
+
+		/* There is no port 6 */
+		if (i == 6)
+			continue;
+
+		name = kasprintf(GFP_KERNEL, "link_state_p%d", i);
+		if (!name)
+			return;
+
+		port->num = i;
+		port->dev = dev;
+		port->irq = platform_get_irq_byname(pdev, name);
+		kfree(name);
+	}
+
+	b53_srab_intr_set(priv, true);
+}
+
 static int b53_srab_probe(struct platform_device *pdev)
 {
 	struct b53_platform_data *pdata = pdev->dev.platform_data;
@@ -417,13 +518,17 @@ static int b53_srab_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, dev);
 
+	b53_srab_prepare_irq(pdev);
+
 	return b53_switch_register(dev);
 }
 
 static int b53_srab_remove(struct platform_device *pdev)
 {
 	struct b53_device *dev = platform_get_drvdata(pdev);
+	struct b53_srab_priv *priv = dev->priv;
 
+	b53_srab_intr_set(priv, false);
 	if (dev)
 		b53_switch_remove(dev);
 
-- 
2.17.1

Re: [PATCH net-next v3 2/5] net: dsa: b53: Make SRAB driver manage port interrupts

[Andrew Lunn]

On Wed, Sep 05, 2018 at 12:42:12PM -0700, Florian Fainelli wrote:
> Update the SRAB driver to manage per-port interrupts. Since we cannot
> sleep during b53_io_ops, schedule a workqueue whenever we get a port
> specific interrupt. We will later make use of this to call back into
> PHYLINK when there is e.g: a link state change.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

[PATCH net-next v3 3/5] net: dsa: b53: Add helper to set link parameters

[Florian Fainelli]

Extract the logic from b53_adjust_link() responsible for overriding a
given port's link, speed, duplex and pause settings and make two helper
functions to set the port's configuration and the port's link settings.
We will make use of both, as separate functions while adding PHYLINK
support next.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/net/dsa/b53/b53_common.c | 89 +++++++++++++++++++++-----------
 1 file changed, 60 insertions(+), 29 deletions(-)

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index 85ed264bc163..78aeaccf19a1 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -26,6 +26,7 @@
 #include <linux/module.h>
 #include <linux/platform_data/b53.h>
 #include <linux/phy.h>
+#include <linux/phylink.h>
 #include <linux/etherdevice.h>
 #include <linux/if_bridge.h>
 #include <net/dsa.h>
@@ -947,33 +948,50 @@ static int b53_setup(struct dsa_switch *ds)
 	return ret;
 }
 
-static void b53_adjust_link(struct dsa_switch *ds, int port,
-			    struct phy_device *phydev)
+static void b53_force_link(struct b53_device *dev, int port, int link)
 {
-	struct b53_device *dev = ds->priv;
-	struct ethtool_eee *p = &dev->ports[port].eee;
-	u8 rgmii_ctrl = 0, reg = 0, off;
-
-	if (!phy_is_pseudo_fixed_link(phydev))
-		return;
+	u8 reg, val, off;
 
 	/* Override the port settings */
 	if (port == dev->cpu_port) {
 		off = B53_PORT_OVERRIDE_CTRL;
-		reg = PORT_OVERRIDE_EN;
+		val = PORT_OVERRIDE_EN;
 	} else {
 		off = B53_GMII_PORT_OVERRIDE_CTRL(port);
-		reg = GMII_PO_EN;
+		val = GMII_PO_EN;
 	}
 
-	/* Set the link UP */
-	if (phydev->link)
+	b53_read8(dev, B53_CTRL_PAGE, off, &reg);
+	reg |= val;
+	if (link)
 		reg |= PORT_OVERRIDE_LINK;
+	else
+		reg &= ~PORT_OVERRIDE_LINK;
+	b53_write8(dev, B53_CTRL_PAGE, off, reg);
+}
+
+static void b53_force_port_config(struct b53_device *dev, int port,
+				  int speed, int duplex, int pause)
+{
+	u8 reg, val, off;
+
+	/* Override the port settings */
+	if (port == dev->cpu_port) {
+		off = B53_PORT_OVERRIDE_CTRL;
+		val = PORT_OVERRIDE_EN;
+	} else {
+		off = B53_GMII_PORT_OVERRIDE_CTRL(port);
+		val = GMII_PO_EN;
+	}
 
-	if (phydev->duplex == DUPLEX_FULL)
+	b53_read8(dev, B53_CTRL_PAGE, off, &reg);
+	reg |= val;
+	if (duplex == DUPLEX_FULL)
 		reg |= PORT_OVERRIDE_FULL_DUPLEX;
+	else
+		reg &= ~PORT_OVERRIDE_FULL_DUPLEX;
 
-	switch (phydev->speed) {
+	switch (speed) {
 	case 2000:
 		reg |= PORT_OVERRIDE_SPEED_2000M;
 		/* fallthrough */
@@ -987,21 +1005,41 @@ static void b53_adjust_link(struct dsa_switch *ds, int port,
 		reg |= PORT_OVERRIDE_SPEED_10M;
 		break;
 	default:
-		dev_err(ds->dev, "unknown speed: %d\n", phydev->speed);
+		dev_err(dev->dev, "unknown speed: %d\n", speed);
 		return;
 	}
 
+	if (pause & MLO_PAUSE_RX)
+		reg |= PORT_OVERRIDE_RX_FLOW;
+	if (pause & MLO_PAUSE_TX)
+		reg |= PORT_OVERRIDE_TX_FLOW;
+
+	b53_write8(dev, B53_CTRL_PAGE, off, reg);
+}
+
+static void b53_adjust_link(struct dsa_switch *ds, int port,
+			    struct phy_device *phydev)
+{
+	struct b53_device *dev = ds->priv;
+	struct ethtool_eee *p = &dev->ports[port].eee;
+	u8 rgmii_ctrl = 0, reg = 0, off;
+	int pause;
+
+	if (!phy_is_pseudo_fixed_link(phydev))
+		return;
+
 	/* Enable flow control on BCM5301x's CPU port */
 	if (is5301x(dev) && port == dev->cpu_port)
-		reg |= PORT_OVERRIDE_RX_FLOW | PORT_OVERRIDE_TX_FLOW;
+		pause = MLO_PAUSE_TXRX_MASK;
 
 	if (phydev->pause) {
 		if (phydev->asym_pause)
-			reg |= PORT_OVERRIDE_TX_FLOW;
-		reg |= PORT_OVERRIDE_RX_FLOW;
+			pause |= MLO_PAUSE_TX;
+		pause |= MLO_PAUSE_RX;
 	}
 
-	b53_write8(dev, B53_CTRL_PAGE, off, reg);
+	b53_force_port_config(dev, port, phydev->speed, phydev->duplex, pause);
+	b53_force_link(dev, port, phydev->link);
 
 	if (is531x5(dev) && phy_interface_is_rgmii(phydev)) {
 		if (port == 8)
@@ -1061,16 +1099,9 @@ static void b53_adjust_link(struct dsa_switch *ds, int port,
 		}
 	} else if (is5301x(dev)) {
 		if (port != dev->cpu_port) {
-			u8 po_reg = B53_GMII_PORT_OVERRIDE_CTRL(dev->cpu_port);
-			u8 gmii_po;
-
-			b53_read8(dev, B53_CTRL_PAGE, po_reg, &gmii_po);
-			gmii_po |= GMII_PO_LINK |
-				   GMII_PO_RX_FLOW |
-				   GMII_PO_TX_FLOW |
-				   GMII_PO_EN |
-				   GMII_PO_SPEED_2000M;
-			b53_write8(dev, B53_CTRL_PAGE, po_reg, gmii_po);
+			b53_force_port_config(dev, dev->cpu_port, 2000,
+					      DUPLEX_FULL, MLO_PAUSE_TXRX_MASK);
+			b53_force_link(dev, dev->cpu_port, 1);
 		}
 	}
 
-- 
2.17.1

Re: [PATCH net-next v3 3/5] net: dsa: b53: Add helper to set link parameters

[Andrew Lunn]

On Wed, Sep 05, 2018 at 12:42:13PM -0700, Florian Fainelli wrote:
> Extract the logic from b53_adjust_link() responsible for overriding a
> given port's link, speed, duplex and pause settings and make two helper
> functions to set the port's configuration and the port's link settings.
> We will make use of both, as separate functions while adding PHYLINK
> support next.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

[PATCH net-next v3 4/5] net: dsa: b53: Add PHYLINK support

[Florian Fainelli]

Add support for PHYLINK, things are reasonably straight forward since we
do not yet support SerDes interfaces, that leaves us with just
MLO_AN_PHY and MLO_AN_FIXED to deal with.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/net/dsa/b53/b53_common.c | 122 +++++++++++++++++++++++++++++++
 drivers/net/dsa/b53/b53_priv.h   |  17 +++++
 2 files changed, 139 insertions(+)

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index 78aeaccf19a1..3d5e822bb17c 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -1109,6 +1109,122 @@ static void b53_adjust_link(struct dsa_switch *ds, int port,
 	p->eee_enabled = b53_eee_init(ds, port, phydev);
 }
 
+void b53_port_event(struct dsa_switch *ds, int port)
+{
+	struct b53_device *dev = ds->priv;
+	bool link;
+	u16 sts;
+
+	b53_read16(dev, B53_STAT_PAGE, B53_LINK_STAT, &sts);
+	link = !!(sts & BIT(port));
+	dsa_port_phylink_mac_change(ds, port, link);
+}
+EXPORT_SYMBOL(b53_port_event);
+
+void b53_phylink_validate(struct dsa_switch *ds, int port,
+			  unsigned long *supported,
+			  struct phylink_link_state *state)
+{
+	struct b53_device *dev = ds->priv;
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
+
+	/* Allow all the expected bits */
+	phylink_set(mask, Autoneg);
+	phylink_set_port_modes(mask);
+	phylink_set(mask, Pause);
+	phylink_set(mask, Asym_Pause);
+
+	/* With the exclusion of 5325/5365, MII, Reverse MII and 802.3z, we
+	 * support Gigabit, including Half duplex.
+	 */
+	if (state->interface != PHY_INTERFACE_MODE_MII &&
+	    state->interface != PHY_INTERFACE_MODE_REVMII &&
+	    !phy_interface_mode_is_8023z(state->interface) &&
+	    !(is5325(dev) || is5365(dev))) {
+		phylink_set(mask, 1000baseT_Full);
+		phylink_set(mask, 1000baseT_Half);
+	}
+
+	if (!phy_interface_mode_is_8023z(state->interface)) {
+		phylink_set(mask, 10baseT_Half);
+		phylink_set(mask, 10baseT_Full);
+		phylink_set(mask, 100baseT_Half);
+		phylink_set(mask, 100baseT_Full);
+	}
+
+	bitmap_and(supported, supported, mask,
+		   __ETHTOOL_LINK_MODE_MASK_NBITS);
+	bitmap_and(state->advertising, state->advertising, mask,
+		   __ETHTOOL_LINK_MODE_MASK_NBITS);
+
+	phylink_helper_basex_speed(state);
+}
+EXPORT_SYMBOL(b53_phylink_validate);
+
+int b53_phylink_mac_link_state(struct dsa_switch *ds, int port,
+			       struct phylink_link_state *state)
+{
+	int ret = -EOPNOTSUPP;
+
+	return ret;
+}
+EXPORT_SYMBOL(b53_phylink_mac_link_state);
+
+void b53_phylink_mac_config(struct dsa_switch *ds, int port,
+			    unsigned int mode,
+			    const struct phylink_link_state *state)
+{
+	struct b53_device *dev = ds->priv;
+
+	if (mode == MLO_AN_PHY)
+		return;
+
+	if (mode == MLO_AN_FIXED) {
+		b53_force_port_config(dev, port, state->speed,
+				      state->duplex, state->pause);
+		return;
+	}
+}
+EXPORT_SYMBOL(b53_phylink_mac_config);
+
+void b53_phylink_mac_an_restart(struct dsa_switch *ds, int port)
+{
+}
+EXPORT_SYMBOL(b53_phylink_mac_an_restart);
+
+void b53_phylink_mac_link_down(struct dsa_switch *ds, int port,
+			       unsigned int mode,
+			       phy_interface_t interface)
+{
+	struct b53_device *dev = ds->priv;
+
+	if (mode == MLO_AN_PHY)
+		return;
+
+	if (mode == MLO_AN_FIXED) {
+		b53_force_link(dev, port, false);
+		return;
+	}
+}
+EXPORT_SYMBOL(b53_phylink_mac_link_down);
+
+void b53_phylink_mac_link_up(struct dsa_switch *ds, int port,
+			     unsigned int mode,
+			     phy_interface_t interface,
+			     struct phy_device *phydev)
+{
+	struct b53_device *dev = ds->priv;
+
+	if (mode == MLO_AN_PHY)
+		return;
+
+	if (mode == MLO_AN_FIXED) {
+		b53_force_link(dev, port, true);
+		return;
+	}
+}
+EXPORT_SYMBOL(b53_phylink_mac_link_up);
+
 int b53_vlan_filtering(struct dsa_switch *ds, int port, bool vlan_filtering)
 {
 	return 0;
@@ -1750,6 +1866,12 @@ static const struct dsa_switch_ops b53_switch_ops = {
 	.phy_read		= b53_phy_read16,
 	.phy_write		= b53_phy_write16,
 	.adjust_link		= b53_adjust_link,
+	.phylink_validate	= b53_phylink_validate,
+	.phylink_mac_link_state	= b53_phylink_mac_link_state,
+	.phylink_mac_config	= b53_phylink_mac_config,
+	.phylink_mac_an_restart	= b53_phylink_mac_an_restart,
+	.phylink_mac_link_down	= b53_phylink_mac_link_down,
+	.phylink_mac_link_up	= b53_phylink_mac_link_up,
 	.port_enable		= b53_enable_port,
 	.port_disable		= b53_disable_port,
 	.get_mac_eee		= b53_get_mac_eee,
diff --git a/drivers/net/dsa/b53/b53_priv.h b/drivers/net/dsa/b53/b53_priv.h
index 2980a5838f58..3f79dc07c00f 100644
--- a/drivers/net/dsa/b53/b53_priv.h
+++ b/drivers/net/dsa/b53/b53_priv.h
@@ -300,6 +300,23 @@ int b53_br_join(struct dsa_switch *ds, int port, struct net_device *bridge);
 void b53_br_leave(struct dsa_switch *ds, int port, struct net_device *bridge);
 void b53_br_set_stp_state(struct dsa_switch *ds, int port, u8 state);
 void b53_br_fast_age(struct dsa_switch *ds, int port);
+void b53_port_event(struct dsa_switch *ds, int port);
+void b53_phylink_validate(struct dsa_switch *ds, int port,
+			  unsigned long *supported,
+			  struct phylink_link_state *state);
+int b53_phylink_mac_link_state(struct dsa_switch *ds, int port,
+			       struct phylink_link_state *state);
+void b53_phylink_mac_config(struct dsa_switch *ds, int port,
+			    unsigned int mode,
+			    const struct phylink_link_state *state);
+void b53_phylink_mac_an_restart(struct dsa_switch *ds, int port);
+void b53_phylink_mac_link_down(struct dsa_switch *ds, int port,
+			       unsigned int mode,
+			       phy_interface_t interface);
+void b53_phylink_mac_link_up(struct dsa_switch *ds, int port,
+			     unsigned int mode,
+			     phy_interface_t interface,
+			     struct phy_device *phydev);
 int b53_vlan_filtering(struct dsa_switch *ds, int port, bool vlan_filtering);
 int b53_vlan_prepare(struct dsa_switch *ds, int port,
 		     const struct switchdev_obj_port_vlan *vlan);
-- 
2.17.1

Re: [PATCH net-next v3 4/5] net: dsa: b53: Add PHYLINK support

[Andrew Lunn]

On Wed, Sep 05, 2018 at 12:42:14PM -0700, Florian Fainelli wrote:
> Add support for PHYLINK, things are reasonably straight forward since we
> do not yet support SerDes interfaces, that leaves us with just
> MLO_AN_PHY and MLO_AN_FIXED to deal with.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

[PATCH net-next v3 5/5] net: dsa: b53: Add SerDes support

[Florian Fainelli]

Add support for the Northstar Plus SerDes which is accessed through a
special page of the switch. Since this is something that most people
probably will not want to use, make it a configurable option with a
default on ARCH_BCM_NSP where it is the most useful currently.

The SerDes supports both SGMII and 1000baseX modes for both lanes, and
2500baseX for one of the lanes, and is internally looking like a
seemingly standard MII PHY, except for the few bits that got repurposed.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/net/dsa/b53/Kconfig      |   7 +
 drivers/net/dsa/b53/Makefile     |   1 +
 drivers/net/dsa/b53/b53_common.c |  26 ++++
 drivers/net/dsa/b53/b53_priv.h   |  17 +++
 drivers/net/dsa/b53/b53_serdes.c | 217 +++++++++++++++++++++++++++++++
 drivers/net/dsa/b53/b53_serdes.h | 121 +++++++++++++++++
 drivers/net/dsa/b53/b53_srab.c   | 101 ++++++++++++++
 7 files changed, 490 insertions(+)
 create mode 100644 drivers/net/dsa/b53/b53_serdes.c
 create mode 100644 drivers/net/dsa/b53/b53_serdes.h

diff --git a/drivers/net/dsa/b53/Kconfig b/drivers/net/dsa/b53/Kconfig
index 37745f4bf4f6..e83ebfafd881 100644
--- a/drivers/net/dsa/b53/Kconfig
+++ b/drivers/net/dsa/b53/Kconfig
@@ -35,3 +35,10 @@ config B53_SRAB_DRIVER
 	help
 	  Select to enable support for memory-mapped Switch Register Access
 	  Bridge Registers (SRAB) like it is found on the BCM53010
+
+config B53_SERDES
+	tristate "B53 SerDes support"
+	depends on B53
+	default ARCH_BCM_NSP
+	help
+	  Select to enable support for SerDes on e.g: Northstar Plus SoCs.
diff --git a/drivers/net/dsa/b53/Makefile b/drivers/net/dsa/b53/Makefile
index 4256fb42a4dd..b1be13023ae4 100644
--- a/drivers/net/dsa/b53/Makefile
+++ b/drivers/net/dsa/b53/Makefile
@@ -5,3 +5,4 @@ obj-$(CONFIG_B53_SPI_DRIVER)	+= b53_spi.o
 obj-$(CONFIG_B53_MDIO_DRIVER)	+= b53_mdio.o
 obj-$(CONFIG_B53_MMAP_DRIVER)	+= b53_mmap.o
 obj-$(CONFIG_B53_SRAB_DRIVER)	+= b53_srab.o
+obj-$(CONFIG_B53_SERDES)	+= b53_serdes.o
diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index 3d5e822bb17c..ea4256cd628b 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -765,6 +765,8 @@ static int b53_reset_switch(struct b53_device *priv)
 	memset(priv->vlans, 0, sizeof(*priv->vlans) * priv->num_vlans);
 	memset(priv->ports, 0, sizeof(*priv->ports) * priv->num_ports);
 
+	priv->serdes_lane = B53_INVALID_LANE;
+
 	return b53_switch_reset(priv);
 }
 
@@ -1128,6 +1130,9 @@ void b53_phylink_validate(struct dsa_switch *ds, int port,
 	struct b53_device *dev = ds->priv;
 	__ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
 
+	if (dev->ops->serdes_phylink_validate)
+		dev->ops->serdes_phylink_validate(dev, port, mask, state);
+
 	/* Allow all the expected bits */
 	phylink_set(mask, Autoneg);
 	phylink_set_port_modes(mask);
@@ -1164,8 +1169,13 @@ EXPORT_SYMBOL(b53_phylink_validate);
 int b53_phylink_mac_link_state(struct dsa_switch *ds, int port,
 			       struct phylink_link_state *state)
 {
+	struct b53_device *dev = ds->priv;
 	int ret = -EOPNOTSUPP;
 
+	if (phy_interface_mode_is_8023z(state->interface) &&
+	    dev->ops->serdes_link_state)
+		ret = dev->ops->serdes_link_state(dev, port, state);
+
 	return ret;
 }
 EXPORT_SYMBOL(b53_phylink_mac_link_state);
@@ -1184,11 +1194,19 @@ void b53_phylink_mac_config(struct dsa_switch *ds, int port,
 				      state->duplex, state->pause);
 		return;
 	}
+
+	if (phy_interface_mode_is_8023z(state->interface) &&
+	    dev->ops->serdes_config)
+		dev->ops->serdes_config(dev, port, mode, state);
 }
 EXPORT_SYMBOL(b53_phylink_mac_config);
 
 void b53_phylink_mac_an_restart(struct dsa_switch *ds, int port)
 {
+	struct b53_device *dev = ds->priv;
+
+	if (dev->ops->serdes_an_restart)
+		dev->ops->serdes_an_restart(dev, port);
 }
 EXPORT_SYMBOL(b53_phylink_mac_an_restart);
 
@@ -1205,6 +1223,10 @@ void b53_phylink_mac_link_down(struct dsa_switch *ds, int port,
 		b53_force_link(dev, port, false);
 		return;
 	}
+
+	if (phy_interface_mode_is_8023z(interface) &&
+	    dev->ops->serdes_link_set)
+		dev->ops->serdes_link_set(dev, port, mode, interface, false);
 }
 EXPORT_SYMBOL(b53_phylink_mac_link_down);
 
@@ -1222,6 +1244,10 @@ void b53_phylink_mac_link_up(struct dsa_switch *ds, int port,
 		b53_force_link(dev, port, true);
 		return;
 	}
+
+	if (phy_interface_mode_is_8023z(interface) &&
+	    dev->ops->serdes_link_set)
+		dev->ops->serdes_link_set(dev, port, mode, interface, true);
 }
 EXPORT_SYMBOL(b53_phylink_mac_link_up);
 
diff --git a/drivers/net/dsa/b53/b53_priv.h b/drivers/net/dsa/b53/b53_priv.h
index 3f79dc07c00f..ec796482792d 100644
--- a/drivers/net/dsa/b53/b53_priv.h
+++ b/drivers/net/dsa/b53/b53_priv.h
@@ -29,6 +29,7 @@
 
 struct b53_device;
 struct net_device;
+struct phylink_link_state;
 
 struct b53_io_ops {
 	int (*read8)(struct b53_device *dev, u8 page, u8 reg, u8 *value);
@@ -45,8 +46,23 @@ struct b53_io_ops {
 	int (*phy_write16)(struct b53_device *dev, int addr, int reg, u16 value);
 	int (*irq_enable)(struct b53_device *dev, int port);
 	void (*irq_disable)(struct b53_device *dev, int port);
+	u8 (*serdes_map_lane)(struct b53_device *dev, int port);
+	int (*serdes_link_state)(struct b53_device *dev, int port,
+				 struct phylink_link_state *state);
+	void (*serdes_config)(struct b53_device *dev, int port,
+			      unsigned int mode,
+			      const struct phylink_link_state *state);
+	void (*serdes_an_restart)(struct b53_device *dev, int port);
+	void (*serdes_link_set)(struct b53_device *dev, int port,
+				unsigned int mode, phy_interface_t interface,
+				bool link_up);
+	void (*serdes_phylink_validate)(struct b53_device *dev, int port,
+					unsigned long *supported,
+					struct phylink_link_state *state);
 };
 
+#define B53_INVALID_LANE	0xff
+
 enum {
 	BCM5325_DEVICE_ID = 0x25,
 	BCM5365_DEVICE_ID = 0x65,
@@ -109,6 +125,7 @@ struct b53_device {
 	/* connect specific data */
 	u8 current_page;
 	struct device *dev;
+	u8 serdes_lane;
 
 	/* Master MDIO bus we got probed from */
 	struct mii_bus *bus;
diff --git a/drivers/net/dsa/b53/b53_serdes.c b/drivers/net/dsa/b53/b53_serdes.c
new file mode 100644
index 000000000000..b45c55e0b8b4
--- /dev/null
+++ b/drivers/net/dsa/b53/b53_serdes.c
@@ -0,0 +1,217 @@
+// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
+/*
+ * Northstar Plus switch SerDes/SGMII PHY main logic
+ *
+ * Copyright (C) 2018 Florian Fainelli <f.fainelli@gmail.com>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/phy.h>
+#include <linux/phylink.h>
+#include <net/dsa.h>
+
+#include "b53_priv.h"
+#include "b53_serdes.h"
+#include "b53_regs.h"
+
+static void b53_serdes_write_blk(struct b53_device *dev, u8 offset, u16 block,
+				 u16 value)
+{
+	b53_write16(dev, B53_SERDES_PAGE, B53_SERDES_BLKADDR, block);
+	b53_write16(dev, B53_SERDES_PAGE, offset, value);
+}
+
+static u16 b53_serdes_read_blk(struct b53_device *dev, u8 offset, u16 block)
+{
+	u16 value;
+
+	b53_write16(dev, B53_SERDES_PAGE, B53_SERDES_BLKADDR, block);
+	b53_read16(dev, B53_SERDES_PAGE, offset, &value);
+
+	return value;
+}
+
+static void b53_serdes_set_lane(struct b53_device *dev, u8 lane)
+{
+	if (dev->serdes_lane == lane)
+		return;
+
+	WARN_ON(lane > 1);
+
+	b53_serdes_write_blk(dev, B53_SERDES_LANE,
+			     SERDES_XGXSBLK0_BLOCKADDRESS, lane);
+	dev->serdes_lane = lane;
+}
+
+static void b53_serdes_write(struct b53_device *dev, u8 lane,
+			     u8 offset, u16 block, u16 value)
+{
+	b53_serdes_set_lane(dev, lane);
+	b53_serdes_write_blk(dev, offset, block, value);
+}
+
+static u16 b53_serdes_read(struct b53_device *dev, u8 lane,
+			   u8 offset, u16 block)
+{
+	b53_serdes_set_lane(dev, lane);
+	return b53_serdes_read_blk(dev, offset, block);
+}
+
+void b53_serdes_config(struct b53_device *dev, int port, unsigned int mode,
+		       const struct phylink_link_state *state)
+{
+	u8 lane = b53_serdes_map_lane(dev, port);
+	u16 reg;
+
+	if (lane == B53_INVALID_LANE)
+		return;
+
+	reg = b53_serdes_read(dev, lane, B53_SERDES_DIGITAL_CONTROL(1),
+			      SERDES_DIGITAL_BLK);
+	if (state->interface == PHY_INTERFACE_MODE_1000BASEX)
+		reg |= FIBER_MODE_1000X;
+	else
+		reg &= ~FIBER_MODE_1000X;
+	b53_serdes_write(dev, lane, B53_SERDES_DIGITAL_CONTROL(1),
+			 SERDES_DIGITAL_BLK, reg);
+}
+EXPORT_SYMBOL(b53_serdes_config);
+
+void b53_serdes_an_restart(struct b53_device *dev, int port)
+{
+	u8 lane = b53_serdes_map_lane(dev, port);
+	u16 reg;
+
+	if (lane == B53_INVALID_LANE)
+		return;
+
+	reg = b53_serdes_read(dev, lane, B53_SERDES_MII_REG(MII_BMCR),
+			      SERDES_MII_BLK);
+	reg |= BMCR_ANRESTART;
+	b53_serdes_write(dev, lane, B53_SERDES_MII_REG(MII_BMCR),
+			 SERDES_MII_BLK, reg);
+}
+EXPORT_SYMBOL(b53_serdes_an_restart);
+
+int b53_serdes_link_state(struct b53_device *dev, int port,
+			  struct phylink_link_state *state)
+{
+	u8 lane = b53_serdes_map_lane(dev, port);
+	u16 dig, bmcr, bmsr;
+
+	if (lane == B53_INVALID_LANE)
+		return 1;
+
+	dig = b53_serdes_read(dev, lane, B53_SERDES_DIGITAL_STATUS,
+			      SERDES_DIGITAL_BLK);
+	bmcr = b53_serdes_read(dev, lane, B53_SERDES_MII_REG(MII_BMCR),
+			       SERDES_MII_BLK);
+	bmsr = b53_serdes_read(dev, lane, B53_SERDES_MII_REG(MII_BMSR),
+			       SERDES_MII_BLK);
+
+	switch ((dig >> SPEED_STATUS_SHIFT) & SPEED_STATUS_MASK) {
+	case SPEED_STATUS_10:
+		state->speed = SPEED_10;
+		break;
+	case SPEED_STATUS_100:
+		state->speed = SPEED_100;
+		break;
+	case SPEED_STATUS_1000:
+		state->speed = SPEED_1000;
+		break;
+	default:
+	case SPEED_STATUS_2500:
+		state->speed = SPEED_2500;
+		break;
+	}
+
+	state->duplex = dig & DUPLEX_STATUS ? DUPLEX_FULL : DUPLEX_HALF;
+	state->an_enabled = !!(bmcr & BMCR_ANENABLE);
+	state->an_complete = !!(bmsr & BMSR_ANEGCOMPLETE);
+	state->link = !!(dig & LINK_STATUS);
+	if (dig & PAUSE_RESOLUTION_RX_SIDE)
+		state->pause |= MLO_PAUSE_RX;
+	if (dig & PAUSE_RESOLUTION_TX_SIDE)
+		state->pause |= MLO_PAUSE_TX;
+
+	return 0;
+}
+EXPORT_SYMBOL(b53_serdes_link_state);
+
+void b53_serdes_link_set(struct b53_device *dev, int port, unsigned int mode,
+			 phy_interface_t interface, bool link_up)
+{
+	u8 lane = b53_serdes_map_lane(dev, port);
+	u16 reg;
+
+	if (lane == B53_INVALID_LANE)
+		return;
+
+	reg = b53_serdes_read(dev, lane, B53_SERDES_MII_REG(MII_BMCR),
+			      SERDES_MII_BLK);
+	if (link_up)
+		reg &= ~BMCR_PDOWN;
+	else
+		reg |= BMCR_PDOWN;
+	b53_serdes_write(dev, lane, B53_SERDES_MII_REG(MII_BMCR),
+			 SERDES_MII_BLK, reg);
+}
+EXPORT_SYMBOL(b53_serdes_link_set);
+
+void b53_serdes_phylink_validate(struct b53_device *dev, int port,
+				 unsigned long *supported,
+				 struct phylink_link_state *state)
+{
+	u8 lane = b53_serdes_map_lane(dev, port);
+
+	if (lane == B53_INVALID_LANE)
+		return;
+
+	switch (lane) {
+	case 0:
+		phylink_set(supported, 2500baseX_Full);
+		/* fallthrough */
+	case 1:
+		phylink_set(supported, 1000baseX_Full);
+		break;
+	default:
+		break;
+	}
+}
+EXPORT_SYMBOL(b53_serdes_phylink_validate);
+
+int b53_serdes_init(struct b53_device *dev, int port)
+{
+	u8 lane = b53_serdes_map_lane(dev, port);
+	u16 id0, msb, lsb;
+
+	if (lane == B53_INVALID_LANE)
+		return -EINVAL;
+
+	id0 = b53_serdes_read(dev, lane, B53_SERDES_ID0, SERDES_ID0);
+	msb = b53_serdes_read(dev, lane, B53_SERDES_MII_REG(MII_PHYSID1),
+			      SERDES_MII_BLK);
+	lsb = b53_serdes_read(dev, lane, B53_SERDES_MII_REG(MII_PHYSID2),
+			      SERDES_MII_BLK);
+	if (id0 == 0 || id0 == 0xffff) {
+		dev_err(dev->dev, "SerDes not initialized, check settings\n");
+		return -ENODEV;
+	}
+
+	dev_info(dev->dev,
+		 "SerDes lane %d, model: %d, rev %c%d (OUI: 0x%08x)\n",
+		 lane, id0 & SERDES_ID0_MODEL_MASK,
+		 (id0 >> SERDES_ID0_REV_LETTER_SHIFT) + 0x41,
+		 (id0 >> SERDES_ID0_REV_NUM_SHIFT) & SERDES_ID0_REV_NUM_MASK,
+		 (u32)msb << 16 | lsb);
+
+	return 0;
+}
+EXPORT_SYMBOL(b53_serdes_init);
+
+MODULE_AUTHOR("Florian Fainelli <f.fainelli@gmail.com>");
+MODULE_DESCRIPTION("B53 Switch SerDes driver");
+MODULE_LICENSE("Dual BSD/GPL");
diff --git a/drivers/net/dsa/b53/b53_serdes.h b/drivers/net/dsa/b53/b53_serdes.h
new file mode 100644
index 000000000000..e0674aa0167f
--- /dev/null
+++ b/drivers/net/dsa/b53/b53_serdes.h
@@ -0,0 +1,121 @@
+/* SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
+ *
+ * Northstar Plus switch SerDes/SGMII PHY definitions
+ *
+ * Copyright (C) 2018 Florian Fainelli <f.fainelli@gmail.com>
+ */
+
+#include <linux/phy.h>
+#include <linux/types.h>
+
+/* Non-standard page used to access SerDes PHY registers on NorthStar Plus */
+#define B53_SERDES_PAGE			0x16
+#define B53_SERDES_BLKADDR		0x3e
+#define B53_SERDES_LANE			0x3c
+
+#define B53_SERDES_ID0			0x20
+#define  SERDES_ID0_MODEL_MASK		0x3f
+#define  SERDES_ID0_REV_NUM_SHIFT	11
+#define  SERDES_ID0_REV_NUM_MASK	0x7
+#define  SERDES_ID0_REV_LETTER_SHIFT	14
+
+#define B53_SERDES_MII_REG(x)		(0x20 + (x) * 2)
+#define B53_SERDES_DIGITAL_CONTROL(x)	(0x18 + (x) * 2)
+#define B53_SERDES_DIGITAL_STATUS	0x28
+
+/* SERDES_DIGITAL_CONTROL1 */
+#define  FIBER_MODE_1000X		BIT(0)
+#define  TBI_INTERFACE			BIT(1)
+#define  SIGNAL_DETECT_EN		BIT(2)
+#define  INVERT_SIGNAL_DETECT		BIT(3)
+#define  AUTODET_EN			BIT(4)
+#define  SGMII_MASTER_MODE		BIT(5)
+#define  DISABLE_DLL_PWRDOWN		BIT(6)
+#define  CRC_CHECKER_DIS		BIT(7)
+#define  COMMA_DET_EN			BIT(8)
+#define  ZERO_COMMA_DET_EN		BIT(9)
+#define  REMOTE_LOOPBACK		BIT(10)
+#define  SEL_RX_PKTS_FOR_CNTR		BIT(11)
+#define  MASTER_MDIO_PHY_SEL		BIT(13)
+#define  DISABLE_SIGNAL_DETECT_FLT	BIT(14)
+
+/* SERDES_DIGITAL_CONTROL2 */
+#define  EN_PARALLEL_DET		BIT(0)
+#define  DIS_FALSE_LINK			BIT(1)
+#define  FLT_FORCE_LINK			BIT(2)
+#define  EN_AUTONEG_ERR_TIMER		BIT(3)
+#define  DIS_REMOTE_FAULT_SENSING	BIT(4)
+#define  FORCE_XMIT_DATA		BIT(5)
+#define  AUTONEG_FAST_TIMERS		BIT(6)
+#define  DIS_CARRIER_EXTEND		BIT(7)
+#define  DIS_TRRR_GENERATION		BIT(8)
+#define  BYPASS_PCS_RX			BIT(9)
+#define  BYPASS_PCS_TX			BIT(10)
+#define  TEST_CNTR_EN			BIT(11)
+#define  TX_PACKET_SEQ_TEST		BIT(12)
+#define  TX_IDLE_JAM_SEQ_TEST		BIT(13)
+#define  CLR_BER_CNTR			BIT(14)
+
+/* SERDES_DIGITAL_CONTROL3 */
+#define  TX_FIFO_RST			BIT(0)
+#define  FIFO_ELAST_TX_RX_SHIFT		1
+#define  FIFO_ELAST_TX_RX_5K		0
+#define  FIFO_ELAST_TX_RX_10K		1
+#define  FIFO_ELAST_TX_RX_13_5K		2
+#define  FIFO_ELAST_TX_RX_18_5K		3
+#define  BLOCK_TXEN_MODE		BIT(9)
+#define  JAM_FALSE_CARRIER_MODE		BIT(10)
+#define  EXT_PHY_CRS_MODE		BIT(11)
+#define  INVERT_EXT_PHY_CRS		BIT(12)
+#define  DISABLE_TX_CRS			BIT(13)
+
+/* SERDES_DIGITAL_STATUS */
+#define  SGMII_MODE			BIT(0)
+#define  LINK_STATUS			BIT(1)
+#define  DUPLEX_STATUS			BIT(2)
+#define  SPEED_STATUS_SHIFT		3
+#define  SPEED_STATUS_10		0
+#define  SPEED_STATUS_100		1
+#define  SPEED_STATUS_1000		2
+#define  SPEED_STATUS_2500		3
+#define  SPEED_STATUS_MASK		SPEED_STATUS_2500
+#define  PAUSE_RESOLUTION_TX_SIDE	BIT(5)
+#define  PAUSE_RESOLUTION_RX_SIDE	BIT(6)
+#define  LINK_STATUS_CHANGE		BIT(7)
+#define  EARLY_END_EXT_DET		BIT(8)
+#define  CARRIER_EXT_ERR_DET		BIT(9)
+#define  RX_ERR_DET			BIT(10)
+#define  TX_ERR_DET			BIT(11)
+#define  CRC_ERR_DET			BIT(12)
+#define  FALSE_CARRIER_ERR_DET		BIT(13)
+#define  RXFIFO_ERR_DET			BIT(14)
+#define  TXFIFO_ERR_DET			BIT(15)
+
+/* Block offsets */
+#define SERDES_DIGITAL_BLK		0x8300
+#define SERDES_ID0			0x8310
+#define SERDES_MII_BLK			0xffe0
+#define SERDES_XGXSBLK0_BLOCKADDRESS	0xffd0
+
+struct phylink_link_state;
+
+static inline u8 b53_serdes_map_lane(struct b53_device *dev, int port)
+{
+	if (!dev->ops->serdes_map_lane)
+		return B53_INVALID_LANE;
+
+	return dev->ops->serdes_map_lane(dev, port);
+}
+
+int b53_serdes_get_link(struct b53_device *dev, int port);
+int b53_serdes_link_state(struct b53_device *dev, int port,
+			  struct phylink_link_state *state);
+void b53_serdes_config(struct b53_device *dev, int port, unsigned int mode,
+		       const struct phylink_link_state *state);
+void b53_serdes_an_restart(struct b53_device *dev, int port);
+void b53_serdes_link_set(struct b53_device *dev, int port, unsigned int mode,
+			 phy_interface_t interface, bool link_up);
+void b53_serdes_phylink_validate(struct b53_device *dev, int port,
+				unsigned long *supported,
+				struct phylink_link_state *state);
+int b53_serdes_init(struct b53_device *dev, int port);
diff --git a/drivers/net/dsa/b53/b53_srab.c b/drivers/net/dsa/b53/b53_srab.c
index 645dde0d317d..149788697fd6 100644
--- a/drivers/net/dsa/b53/b53_srab.c
+++ b/drivers/net/dsa/b53/b53_srab.c
@@ -25,6 +25,7 @@
 #include <linux/of.h>
 
 #include "b53_priv.h"
+#include "b53_serdes.h"
 
 /* command and status register of the SRAB */
 #define B53_SRAB_CMDSTAT		0x2c
@@ -62,15 +63,28 @@
 #define  B53_SRAB_P7_SLEEP_TIMER	BIT(11)
 #define  B53_SRAB_IMP0_SLEEP_TIMER	BIT(12)
 
+/* Port mux configuration registers */
+#define B53_MUX_CONFIG_P5		0x00
+#define  MUX_CONFIG_SGMII		0
+#define  MUX_CONFIG_MII_LITE		1
+#define  MUX_CONFIG_RGMII		2
+#define  MUX_CONFIG_GMII		3
+#define  MUX_CONFIG_GPHY		4
+#define  MUX_CONFIG_INTERNAL		5
+#define  MUX_CONFIG_MASK		0x7
+#define B53_MUX_CONFIG_P4		0x04
+
 struct b53_srab_port_priv {
 	int irq;
 	bool irq_enabled;
 	struct b53_device *dev;
 	unsigned int num;
+	phy_interface_t mode;
 };
 
 struct b53_srab_priv {
 	void __iomem *regs;
+	void __iomem *mux_config;
 	struct b53_srab_port_priv port_intrs[B53_N_PORTS];
 };
 
@@ -356,6 +370,11 @@ static int b53_srab_write64(struct b53_device *dev, u8 page, u8 reg,
 
 static irqreturn_t b53_srab_port_thread(int irq, void *dev_id)
 {
+	struct b53_srab_port_priv *port = dev_id;
+	struct b53_device *dev = port->dev;
+
+	b53_port_event(dev->ds, port->num);
+
 	return IRQ_HANDLED;
 }
 
@@ -371,6 +390,24 @@ static irqreturn_t b53_srab_port_isr(int irq, void *dev_id)
 	return IRQ_WAKE_THREAD;
 }
 
+static u8 b53_srab_serdes_map_lane(struct b53_device *dev, int port)
+{
+	struct b53_srab_priv *priv = dev->priv;
+	struct b53_srab_port_priv *p = &priv->port_intrs[port];
+
+	if (p->mode != PHY_INTERFACE_MODE_SGMII)
+		return B53_INVALID_LANE;
+
+	switch (port) {
+	case 5:
+		return 0;
+	case 4:
+		return 1;
+	default:
+		return B53_INVALID_LANE;
+	}
+}
+
 static int b53_srab_irq_enable(struct b53_device *dev, int port)
 {
 	struct b53_srab_priv *priv = dev->priv;
@@ -410,6 +447,14 @@ static const struct b53_io_ops b53_srab_ops = {
 	.write64 = b53_srab_write64,
 	.irq_enable = b53_srab_irq_enable,
 	.irq_disable = b53_srab_irq_disable,
+#if IS_ENABLED(CONFIG_B53_SERDES)
+	.serdes_map_lane = b53_srab_serdes_map_lane,
+	.serdes_link_state = b53_serdes_link_state,
+	.serdes_config = b53_serdes_config,
+	.serdes_an_restart = b53_serdes_an_restart,
+	.serdes_link_set = b53_serdes_link_set,
+	.serdes_phylink_validate = b53_serdes_phylink_validate,
+#endif
 };
 
 static const struct of_device_id b53_srab_of_match[] = {
@@ -480,6 +525,61 @@ static void b53_srab_prepare_irq(struct platform_device *pdev)
 	b53_srab_intr_set(priv, true);
 }
 
+static void b53_srab_mux_init(struct platform_device *pdev)
+{
+	struct b53_device *dev = platform_get_drvdata(pdev);
+	struct b53_srab_priv *priv = dev->priv;
+	struct b53_srab_port_priv *p;
+	struct resource *r;
+	unsigned int port;
+	u32 reg, off = 0;
+	int ret;
+
+	if (dev->pdata && dev->pdata->chip_id != BCM58XX_DEVICE_ID)
+		return;
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	priv->mux_config = devm_ioremap_resource(&pdev->dev, r);
+	if (IS_ERR(priv->mux_config))
+		return;
+
+	/* Obtain the port mux configuration so we know which lanes
+	 * actually map to SerDes lanes
+	 */
+	for (port = 5; port > 3; port--, off += 4) {
+		p = &priv->port_intrs[port];
+
+		reg = readl(priv->mux_config + B53_MUX_CONFIG_P5 + off);
+		switch (reg & MUX_CONFIG_MASK) {
+		case MUX_CONFIG_SGMII:
+			p->mode = PHY_INTERFACE_MODE_SGMII;
+			ret = b53_serdes_init(dev, port);
+			if (ret)
+				continue;
+			break;
+		case MUX_CONFIG_MII_LITE:
+			p->mode = PHY_INTERFACE_MODE_MII;
+			break;
+		case MUX_CONFIG_GMII:
+			p->mode = PHY_INTERFACE_MODE_GMII;
+			break;
+		case MUX_CONFIG_RGMII:
+			p->mode = PHY_INTERFACE_MODE_RGMII;
+			break;
+		case MUX_CONFIG_INTERNAL:
+			p->mode = PHY_INTERFACE_MODE_INTERNAL;
+			break;
+		default:
+			p->mode = PHY_INTERFACE_MODE_NA;
+			break;
+		}
+
+		if (p->mode != PHY_INTERFACE_MODE_NA)
+			dev_info(&pdev->dev, "Port %d mode: %s\n",
+				 port, phy_modes(p->mode));
+	}
+}
+
 static int b53_srab_probe(struct platform_device *pdev)
 {
 	struct b53_platform_data *pdata = pdev->dev.platform_data;
@@ -519,6 +619,7 @@ static int b53_srab_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, dev);
 
 	b53_srab_prepare_irq(pdev);
+	b53_srab_mux_init(pdev);
 
 	return b53_switch_register(dev);
 }
-- 
2.17.1

Re: [PATCH net-next v3 5/5] net: dsa: b53: Add SerDes support

[Andrew Lunn]

On Wed, Sep 05, 2018 at 12:42:15PM -0700, Florian Fainelli wrote:
> Add support for the Northstar Plus SerDes which is accessed through a
> special page of the switch. Since this is something that most people
> probably will not want to use, make it a configurable option with a
> default on ARCH_BCM_NSP where it is the most useful currently.
> 
> The SerDes supports both SGMII and 1000baseX modes for both lanes, and
> 2500baseX for one of the lanes, and is internally looking like a
> seemingly standard MII PHY, except for the few bits that got repurposed.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
 
Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

Re: [PATCH net-next v3 0/5] net: dsa: b53: SerDes support

[David Miller]

From: Florian Fainelli <f.fainelli@gmail.com>
Date: Wed,  5 Sep 2018 12:42:10 -0700

> This patch series adds support for the SerDes found on NorthStar Plus
> (NSP) which allows us to use the SFP port on the BCM958625HR board (and
> other similar designs).
> 
> Changes in v3:
> 
> - properly hunk the request_threaded_irq() bits into patch #2
> 
> Changes in v2:
> 
> - migrate to threaded interrupt (Andrew)
> - fixed a case where MLO_AN_FIXED's mac_config would still call into
>   the serdes_config callback
> - added an additional check on the phylink interface in mac_config
> - default to ARCH_BCM_NSP instead of ARCH_BCM_IPROC which is really
>   the NSP Kconfig bit we want

Series applied, thanks Florian.