/* * 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; int rc, i; /* 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; /* 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_child_of_node(np, child) { const __be32 *paddr; u32 addr; int len; /* A PHY must have a reg property in the range [0-31] */ paddr = of_get_property(child, "reg", &len); if (!paddr || len < sizeof(*paddr)) { 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; } phy = get_phy_device(mdio, addr); if (!phy || IS_ERR(phy)) { dev_err(&mdio->dev, "error probing PHY at address %i\n", addr); continue; } phy_scan_fixups(phy); /* 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); } 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 successfull. 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, flags, 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, "0", be32_to_cpu(phy_id[0])); phy = phy_connect(dev, bus_id, hndlr, 0, iface); return IS_ERR(phy) ? NULL : phy; } EXPORT_SYMBOL(of_phy_connect_fixed_link);