1 files changed, 249 insertions, 0 deletions
diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
new file mode 100644
index 00000000..d5a57a9e
--- /dev/null
+++ b/drivers/of/of_mdio.c
@@ -0,0 +1,249 @@
+/*
+ * OF helpers for the MDIO (Ethernet PHY) API
+ *
+ * Copyright (c) 2009 Secret Lab Technologies, Ltd.
+ *
+ * This file is released under the GPLv2
+ *
+ * This file provides helper functions for extracting PHY device information
+ * out of the OpenFirmware device tree and using it to populate an mii_bus.
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/netdevice.h>
+#include <linux/err.h>
+#include <linux/phy.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_mdio.h>
+#include <linux/module.h>
+
+MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
+MODULE_LICENSE("GPL");
+
+/**
+ * of_mdiobus_register - Register mii_bus and create PHYs from the device tree
+ * @mdio: pointer to mii_bus structure
+ * @np: pointer to device_node of MDIO bus.
+ *
+ * This function registers the mii_bus structure and registers a phy_device
+ * for each child node of @np.
+ */
+int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
+{
+	struct phy_device *phy;
+	struct device_node *child;
+	const __be32 *paddr;
+	u32 addr;
+	bool is_c45, scanphys = false;
+	int rc, i, len;
+
+	/* Mask out all PHYs from auto probing.  Instead the PHYs listed in
+	 * the device tree are populated after the bus has been registered */
+	mdio->phy_mask = ~0;
+
+	/* Clear all the IRQ properties */
+	if (mdio->irq)
+		for (i=0; i<PHY_MAX_ADDR; i++)
+			mdio->irq[i] = PHY_POLL;
+
+	mdio->dev.of_node = np;
+
+	/* Register the MDIO bus */
+	rc = mdiobus_register(mdio);
+	if (rc)
+		return rc;
+
+	/* Loop over the child nodes and register a phy_device for each one */
+	for_each_available_child_of_node(np, child) {
+		/* A PHY must have a reg property in the range [0-31] */
+		paddr = of_get_property(child, "reg", &len);
+		if (!paddr || len < sizeof(*paddr)) {
+			scanphys = true;
+			dev_err(&mdio->dev, "%s has invalid PHY address\n",
+				child->full_name);
+			continue;
+		}
+
+		addr = be32_to_cpup(paddr);
+		if (addr >= 32) {
+			dev_err(&mdio->dev, "%s PHY address %i is too large\n",
+				child->full_name, addr);
+			continue;
+		}
+
+		if (mdio->irq) {
+			mdio->irq[addr] = irq_of_parse_and_map(child, 0);
+			if (!mdio->irq[addr])
+				mdio->irq[addr] = PHY_POLL;
+		}
+
+		is_c45 = of_device_is_compatible(child,
+						 "ethernet-phy-ieee802.3-c45");
+		phy = get_phy_device(mdio, addr, is_c45);
+
+		if (!phy || IS_ERR(phy)) {
+			dev_err(&mdio->dev,
+				"cannot get PHY at address %i\n",
+				addr);
+			continue;
+		}
+
+		/* Associate the OF node with the device structure so it
+		 * can be looked up later */
+		of_node_get(child);
+		phy->dev.of_node = child;
+
+		/* All data is now stored in the phy struct; register it */
+		rc = phy_device_register(phy);
+		if (rc) {
+			phy_device_free(phy);
+			of_node_put(child);
+			continue;
+		}
+
+		dev_dbg(&mdio->dev, "registered phy %s at address %i\n",
+			child->name, addr);
+	}
+
+	if (!scanphys)
+		return 0;
+
+	/* auto scan for PHYs with empty reg property */
+	for_each_available_child_of_node(np, child) {
+		/* Skip PHYs with reg property set */
+		paddr = of_get_property(child, "reg", &len);
+		if (paddr)
+			continue;
+
+		is_c45 = of_device_is_compatible(child,
+						 "ethernet-phy-ieee802.3-c45");
+
+		for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
+			/* skip already registered PHYs */
+			if (mdio->phy_map[addr])
+				continue;
+
+			/* be noisy to encourage people to set reg property */
+			dev_info(&mdio->dev, "scan phy %s at address %i\n",
+				 child->name, addr);
+
+			phy = get_phy_device(mdio, addr, is_c45);
+			if (!phy || IS_ERR(phy))
+				continue;
+
+			if (mdio->irq) {
+				mdio->irq[addr] =
+					irq_of_parse_and_map(child, 0);
+				if (!mdio->irq[addr])
+					mdio->irq[addr] = PHY_POLL;
+			}
+
+			/* Associate the OF node with the device structure so it
+			 * can be looked up later */
+			of_node_get(child);
+			phy->dev.of_node = child;
+
+			/* All data is now stored in the phy struct;
+			 * register it */
+			rc = phy_device_register(phy);
+			if (rc) {
+				phy_device_free(phy);
+				of_node_put(child);
+				continue;
+			}
+
+			dev_info(&mdio->dev, "registered phy %s at address %i\n",
+				 child->name, addr);
+			break;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(of_mdiobus_register);
+
+/* Helper function for of_phy_find_device */
+static int of_phy_match(struct device *dev, void *phy_np)
+{
+	return dev->of_node == phy_np;
+}
+
+/**
+ * of_phy_find_device - Give a PHY node, find the phy_device
+ * @phy_np: Pointer to the phy's device tree node
+ *
+ * Returns a pointer to the phy_device.
+ */
+struct phy_device *of_phy_find_device(struct device_node *phy_np)
+{
+	struct device *d;
+	if (!phy_np)
+		return NULL;
+
+	d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match);
+	return d ? to_phy_device(d) : NULL;
+}
+EXPORT_SYMBOL(of_phy_find_device);
+
+/**
+ * of_phy_connect - Connect to the phy described in the device tree
+ * @dev: pointer to net_device claiming the phy
+ * @phy_np: Pointer to device tree node for the PHY
+ * @hndlr: Link state callback for the network device
+ * @iface: PHY data interface type
+ *
+ * Returns a pointer to the phy_device if successful.  NULL otherwise
+ */
+struct phy_device *of_phy_connect(struct net_device *dev,
+				  struct device_node *phy_np,
+				  void (*hndlr)(struct net_device *), u32 flags,
+				  phy_interface_t iface)
+{
+	struct phy_device *phy = of_phy_find_device(phy_np);
+
+	if (!phy)
+		return NULL;
+
+	return phy_connect_direct(dev, phy, hndlr, iface) ? NULL : phy;
+}
+EXPORT_SYMBOL(of_phy_connect);
+
+/**
+ * of_phy_connect_fixed_link - Parse fixed-link property and return a dummy phy
+ * @dev: pointer to net_device claiming the phy
+ * @hndlr: Link state callback for the network device
+ * @iface: PHY data interface type
+ *
+ * This function is a temporary stop-gap and will be removed soon.  It is
+ * only to support the fs_enet, ucc_geth and gianfar Ethernet drivers.  Do
+ * not call this function from new drivers.
+ */
+struct phy_device *of_phy_connect_fixed_link(struct net_device *dev,
+					     void (*hndlr)(struct net_device *),
+					     phy_interface_t iface)
+{
+	struct device_node *net_np;
+	char bus_id[MII_BUS_ID_SIZE + 3];
+	struct phy_device *phy;
+	const __be32 *phy_id;
+	int sz;
+
+	if (!dev->dev.parent)
+		return NULL;
+
+	net_np = dev->dev.parent->of_node;
+	if (!net_np)
+		return NULL;
+
+	phy_id = of_get_property(net_np, "fixed-link", &sz);
+	if (!phy_id || sz < sizeof(*phy_id))
+		return NULL;
+
+	sprintf(bus_id, PHY_ID_FMT, "fixed-0", be32_to_cpu(phy_id[0]));
+
+	phy = phy_connect(dev, bus_id, hndlr, iface);
+	return IS_ERR(phy) ? NULL : phy;
+}
+EXPORT_SYMBOL(of_phy_connect_fixed_link);