| /* |
| * 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"); |
| |
| static void of_set_phy_supported(struct phy_device *phydev, u32 max_speed) |
| { |
| phydev->supported |= PHY_DEFAULT_FEATURES; |
| |
| switch (max_speed) { |
| default: |
| return; |
| |
| case SPEED_1000: |
| phydev->supported |= PHY_1000BT_FEATURES; |
| case SPEED_100: |
| phydev->supported |= PHY_100BT_FEATURES; |
| case SPEED_10: |
| phydev->supported |= PHY_10BT_FEATURES; |
| } |
| } |
| |
| static int of_mdiobus_register_phy(struct mii_bus *mdio, struct device_node *child, |
| u32 addr) |
| { |
| struct phy_device *phy; |
| bool is_c45; |
| int rc, prev_irq; |
| u32 max_speed = 0; |
| |
| 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)) |
| return 1; |
| |
| if (mdio->irq) { |
| prev_irq = mdio->irq[addr]; |
| mdio->irq[addr] = |
| irq_of_parse_and_map(child, 0); |
| if (!mdio->irq[addr]) |
| mdio->irq[addr] = prev_irq; |
| } |
| |
| /* 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); |
| return 1; |
| } |
| |
| /* Set phydev->supported based on the "max-speed" property |
| * if present */ |
| if (!of_property_read_u32(child, "max-speed", &max_speed)) |
| of_set_phy_supported(phy, max_speed); |
| |
| dev_dbg(&mdio->dev, "registered phy %s at address %i\n", |
| child->name, addr); |
| |
| return 0; |
| } |
| |
| /** |
| * 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 device_node *child; |
| const __be32 *paddr; |
| u32 addr; |
| bool 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 >= PHY_MAX_ADDR) { |
| dev_err(&mdio->dev, "%s PHY address %i is too large\n", |
| child->full_name, addr); |
| continue; |
| } |
| |
| rc = of_mdiobus_register_phy(mdio, child, addr); |
| if (rc) |
| continue; |
| } |
| |
| 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; |
| |
| 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); |
| |
| rc = of_mdiobus_register_phy(mdio, child, addr); |
| if (rc) |
| continue; |
| } |
| } |
| |
| 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); |