[PATCH net-next v22 10/14] net: phy: marvell10g: Support SFP through phy_port

[Maxime Chevallier <maxime.chevallier@bootlin.com>]

Convert the Marvell10G driver to use the generic SFP handling, through a
dedicated .attach_port() handler to populate the port's supported
interfaces.

As the 88x3310 supports multiple MDI, the .attach_port() logic handles
both SFP attach with 10GBaseR support, and support for the "regular"
port that usually is a BaseT port.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Tested-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
---
 drivers/net/phy/marvell10g.c | 49 +++++++++++++++++++++---------------
 drivers/net/phy/phy_port.c   | 44 ++++++++++++++++++++++++++++++++
 include/linux/phy_port.h     |  1 +
 3 files changed, 74 insertions(+), 20 deletions(-)

diff --git a/drivers/net/phy/marvell10g.c b/drivers/net/phy/marvell10g.c
index 8fd42131cdbf..b40df82152cd 100644
--- a/drivers/net/phy/marvell10g.c
+++ b/drivers/net/phy/marvell10g.c
@@ -28,7 +28,7 @@
 #include <linux/hwmon.h>
 #include <linux/marvell_phy.h>
 #include <linux/phy.h>
-#include <linux/sfp.h>
+#include <linux/phy_port.h>
 #include <linux/netdevice.h>
 
 #define MV_PHY_ALASKA_NBT_QUIRK_MASK	0xfffffffe
@@ -463,30 +463,29 @@ static int mv3310_set_edpd(struct phy_device *phydev, u16 edpd)
 	return err;
 }
 
-static int mv3310_sfp_insert(void *upstream, const struct sfp_eeprom_id *id)
+static int mv3310_attach_mii_port(struct phy_device *phydev,
+				  struct phy_port *port)
 {
-	struct phy_device *phydev = upstream;
-	const struct sfp_module_caps *caps;
-	phy_interface_t iface;
+	__set_bit(PHY_INTERFACE_MODE_10GBASER, port->interfaces);
+	return 0;
+}
 
-	caps = sfp_get_module_caps(phydev->sfp_bus);
-	iface = sfp_select_interface(phydev->sfp_bus, caps->link_modes);
+static int mv3310_attach_mdi_port(struct phy_device *phydev,
+				  struct phy_port *port)
+{
+	/* This PHY can do combo-ports, i.e. 2 MDI outputs, usually one
+	 * of them going to an SFP and the other one to a RJ45
+	 * connector. If we don't have any representation for the port
+	 * in DT, and we are dealing with a non-SFP port, then we
+	 * mask the port's capabilities to report BaseT-only modes
+	 */
+	if (port->not_described)
+		return phy_port_restrict_mediums(port,
+						 BIT(ETHTOOL_LINK_MEDIUM_BASET));
 
-	if (iface != PHY_INTERFACE_MODE_10GBASER) {
-		dev_err(&phydev->mdio.dev, "incompatible SFP module inserted\n");
-		return -EINVAL;
-	}
 	return 0;
 }
 
-static const struct sfp_upstream_ops mv3310_sfp_ops = {
-	.attach = phy_sfp_attach,
-	.detach = phy_sfp_detach,
-	.connect_phy = phy_sfp_connect_phy,
-	.disconnect_phy = phy_sfp_disconnect_phy,
-	.module_insert = mv3310_sfp_insert,
-};
-
 static int mv3310_probe(struct phy_device *phydev)
 {
 	const struct mv3310_chip *chip = to_mv3310_chip(phydev);
@@ -544,7 +543,9 @@ static int mv3310_probe(struct phy_device *phydev)
 
 	chip->init_supported_interfaces(priv->supported_interfaces);
 
-	return phy_sfp_probe(phydev, &mv3310_sfp_ops);
+	phydev->max_n_ports = 2;
+
+	return 0;
 }
 
 static void mv3310_remove(struct phy_device *phydev)
@@ -1405,6 +1406,8 @@ static struct phy_driver mv3310_drivers[] = {
 		.set_loopback	= genphy_c45_loopback,
 		.get_wol	= mv3110_get_wol,
 		.set_wol	= mv3110_set_wol,
+		.attach_mii_port = mv3310_attach_mii_port,
+		.attach_mdi_port = mv3310_attach_mdi_port,
 	},
 	{
 		.phy_id		= MARVELL_PHY_ID_88X3310,
@@ -1424,6 +1427,8 @@ static struct phy_driver mv3310_drivers[] = {
 		.set_tunable	= mv3310_set_tunable,
 		.remove		= mv3310_remove,
 		.set_loopback	= genphy_c45_loopback,
+		.attach_mii_port = mv3310_attach_mii_port,
+		.attach_mdi_port = mv3310_attach_mdi_port,
 	},
 	{
 		.phy_id		= MARVELL_PHY_ID_88E2110,
@@ -1444,6 +1449,8 @@ static struct phy_driver mv3310_drivers[] = {
 		.set_loopback	= genphy_c45_loopback,
 		.get_wol	= mv3110_get_wol,
 		.set_wol	= mv3110_set_wol,
+		.attach_mii_port = mv3310_attach_mii_port,
+		.attach_mdi_port = mv3310_attach_mdi_port,
 	},
 	{
 		.phy_id		= MARVELL_PHY_ID_88E2110,
@@ -1462,6 +1469,8 @@ static struct phy_driver mv3310_drivers[] = {
 		.set_tunable	= mv3310_set_tunable,
 		.remove		= mv3310_remove,
 		.set_loopback	= genphy_c45_loopback,
+		.attach_mii_port = mv3310_attach_mii_port,
+		.attach_mdi_port = mv3310_attach_mdi_port,
 	},
 };
 
diff --git a/drivers/net/phy/phy_port.c b/drivers/net/phy/phy_port.c
index 81e557aae0d6..ec93c8ca051e 100644
--- a/drivers/net/phy/phy_port.c
+++ b/drivers/net/phy/phy_port.c
@@ -149,6 +149,50 @@ void phy_port_update_supported(struct phy_port *port)
 }
 EXPORT_SYMBOL_GPL(phy_port_update_supported);
 
+/**
+ * phy_port_filter_supported() - Make sure that port->supported match port->mediums
+ * @port: The port to filter
+ *
+ * After updating a port's mediums to a more restricted subset, this helper will
+ * make sure that port->supported only contains linkmodes that are compatible
+ * with port->mediums.
+ */
+static void phy_port_filter_supported(struct phy_port *port)
+{
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(supported) = { 0 };
+	int i;
+
+	for_each_set_bit(i, &port->mediums, __ETHTOOL_LINK_MEDIUM_LAST)
+		phy_caps_medium_get_supported(supported, i, port->pairs);
+
+	linkmode_and(port->supported, port->supported, supported);
+}
+
+/**
+ * phy_port_restrict_mediums - Mask away some of the port's supported mediums
+ * @port: The port to act upon
+ * @mediums: A mask of mediums to support on the port
+ *
+ * This helper allows removing some mediums from a port's list of supported
+ * mediums, which occurs once we have enough information about the port to
+ * know its nature.
+ *
+ * Returns: 0 if the change was donne correctly, a negative value otherwise.
+ */
+int phy_port_restrict_mediums(struct phy_port *port, unsigned long mediums)
+{
+	/* We forbid ending-up with a port with empty mediums */
+	if (!(port->mediums & mediums))
+		return -EINVAL;
+
+	port->mediums &= mediums;
+
+	phy_port_filter_supported(port);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(phy_port_restrict_mediums);
+
 /**
  * phy_port_get_type() - get the PORT_* attribute for that port.
  * @port: The port we want the information from
diff --git a/include/linux/phy_port.h b/include/linux/phy_port.h
index 550c3f4ab19f..0ef0f5ce4709 100644
--- a/include/linux/phy_port.h
+++ b/include/linux/phy_port.h
@@ -92,6 +92,7 @@ static inline bool phy_port_is_fiber(struct phy_port *port)
 }
 
 void phy_port_update_supported(struct phy_port *port);
+int phy_port_restrict_mediums(struct phy_port *port, unsigned long mediums);
 
 int phy_port_get_type(struct phy_port *port);
 
-- 
2.49.0