net: phy: add core phylib sfp support

Add core phylib help for supporting SFP sockets on PHYs.  This provides
a mechanism to inform the SFP layer about PHY up/down events, and also
unregister the SFP bus when the PHY is going away.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 73 insertions, 0 deletions

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 105d389b58e7..36d4ffe1cd3f 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -23,6 +23,7 @@
 #include <linux/ethtool.h>
 #include <linux/phy.h>
 #include <linux/phy_led_triggers.h>
+#include <linux/sfp.h>
 #include <linux/workqueue.h>
 #include <linux/mdio.h>
 #include <linux/io.h>
@@ -841,6 +842,9 @@ void phy_stop(struct phy_device *phydev)
 
 	mutex_lock(&phydev->lock);
 
+	if (phydev->sfp_bus)
+		sfp_upstream_stop(phydev->sfp_bus);
+
 	phydev->state = PHY_HALTED;
 
 	mutex_unlock(&phydev->lock);
@@ -875,6 +879,9 @@ void phy_start(struct phy_device *phydev)
 		goto out;
 	}
 
+	if (phydev->sfp_bus)
+		sfp_upstream_start(phydev->sfp_bus);
+
 	/* if phy was suspended, bring the physical link up again */
 	__phy_resume(phydev);
 
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index fa71998fea51..40f1942f1606 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -27,6 +27,7 @@
 #include <linux/bitmap.h>
 #include <linux/phy.h>
 #include <linux/phy_led_triggers.h>
+#include <linux/sfp.h>
 #include <linux/mdio.h>
 #include <linux/io.h>
 #include <linux/uaccess.h>
@@ -1175,6 +1176,65 @@ phy_standalone_show(struct device *dev, struct device_attribute *attr,
 static DEVICE_ATTR_RO(phy_standalone);
 
 /**
+ * phy_sfp_attach - attach the SFP bus to the PHY upstream network device
+ * @upstream: pointer to the phy device
+ * @bus: sfp bus representing cage being attached
+ *
+ * This is used to fill in the sfp_upstream_ops .attach member.
+ */
+void phy_sfp_attach(void *upstream, struct sfp_bus *bus)
+{
+	struct phy_device *phydev = upstream;
+
+	if (phydev->attached_dev)
+		phydev->attached_dev->sfp_bus = bus;
+	phydev->sfp_bus_attached = true;
+}
+EXPORT_SYMBOL(phy_sfp_attach);
+
+/**
+ * phy_sfp_detach - detach the SFP bus from the PHY upstream network device
+ * @upstream: pointer to the phy device
+ * @bus: sfp bus representing cage being attached
+ *
+ * This is used to fill in the sfp_upstream_ops .detach member.
+ */
+void phy_sfp_detach(void *upstream, struct sfp_bus *bus)
+{
+	struct phy_device *phydev = upstream;
+
+	if (phydev->attached_dev)
+		phydev->attached_dev->sfp_bus = NULL;
+	phydev->sfp_bus_attached = false;
+}
+EXPORT_SYMBOL(phy_sfp_detach);
+
+/**
+ * phy_sfp_probe - probe for a SFP cage attached to this PHY device
+ * @phydev: Pointer to phy_device
+ * @ops: SFP's upstream operations
+ */
+int phy_sfp_probe(struct phy_device *phydev,
+		  const struct sfp_upstream_ops *ops)
+{
+	struct sfp_bus *bus;
+	int ret;
+
+	if (phydev->mdio.dev.fwnode) {
+		bus = sfp_bus_find_fwnode(phydev->mdio.dev.fwnode);
+		if (IS_ERR(bus))
+			return PTR_ERR(bus);
+
+		phydev->sfp_bus = bus;
+
+		ret = sfp_bus_add_upstream(bus, phydev, ops);
+		sfp_bus_put(bus);
+	}
+	return 0;
+}
+EXPORT_SYMBOL(phy_sfp_probe);
+
+/**
  * phy_attach_direct - attach a network device to a given PHY device pointer
  * @dev: network device to attach
  * @phydev: Pointer to phy_device to attach
@@ -1249,6 +1309,9 @@ int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
 	if (dev) {
 		phydev->attached_dev = dev;
 		dev->phydev = phydev;
+
+		if (phydev->sfp_bus_attached)
+			dev->sfp_bus = phydev->sfp_bus;
 	}
 
 	/* Some Ethernet drivers try to connect to a PHY device before
@@ -2418,6 +2481,9 @@ static int phy_remove(struct device *dev)
 	phydev->state = PHY_DOWN;
 	mutex_unlock(&phydev->lock);
 
+	sfp_bus_del_upstream(phydev->sfp_bus);
+	phydev->sfp_bus = NULL;
+
 	if (phydev->drv && phydev->drv->remove) {
 		phydev->drv->remove(phydev);