| /* |
| * 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/phy_fixed.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"); |
| |
| /* Extract the clause 22 phy ID from the compatible string of the form |
| * ethernet-phy-idAAAA.BBBB */ |
| static int of_get_phy_id(struct device_node *device, u32 *phy_id) |
| { |
| struct property *prop; |
| const char *cp; |
| unsigned int upper, lower; |
| |
| of_property_for_each_string(device, "compatible", prop, cp) { |
| if (sscanf(cp, "ethernet-phy-id%4x.%4x", &upper, &lower) == 2) { |
| *phy_id = ((upper & 0xFFFF) << 16) | (lower & 0xFFFF); |
| return 0; |
| } |
| } |
| return -EINVAL; |
| } |
| |
| 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; |
| u32 phy_id; |
| |
| is_c45 = of_device_is_compatible(child, |
| "ethernet-phy-ieee802.3-c45"); |
| |
| if (!is_c45 && !of_get_phy_id(child, &phy_id)) |
| phy = phy_device_create(mdio, addr, phy_id, 0, NULL); |
| else |
| phy = get_phy_device(mdio, addr, is_c45); |
| if (!phy || IS_ERR(phy)) |
| return 1; |
| |
| rc = irq_of_parse_and_map(child, 0); |
| if (rc > 0) { |
| phy->irq = rc; |
| if (mdio->irq) |
| mdio->irq[addr] = rc; |
| } else { |
| if (mdio->irq) |
| phy->irq = mdio->irq[addr]; |
| } |
| |
| /* 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; |
| } |
| |
| dev_dbg(&mdio->dev, "registered phy %s at address %i\n", |
| child->name, addr); |
| |
| return 0; |
| } |
| |
| static int of_mdio_parse_addr(struct device *dev, const struct device_node *np) |
| { |
| u32 addr; |
| int ret; |
| |
| ret = of_property_read_u32(np, "reg", &addr); |
| if (ret < 0) { |
| dev_err(dev, "%s has invalid PHY address\n", np->full_name); |
| return ret; |
| } |
| |
| /* A PHY must have a reg property in the range [0-31] */ |
| if (addr >= PHY_MAX_ADDR) { |
| dev_err(dev, "%s PHY address %i is too large\n", |
| np->full_name, addr); |
| return -EINVAL; |
| } |
| |
| return addr; |
| } |
| |
| /** |
| * 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; |
| bool scanphys = false; |
| int addr, 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; |
| |
| 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) { |
| addr = of_mdio_parse_addr(&mdio->dev, child); |
| if (addr < 0) { |
| scanphys = true; |
| 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", NULL); |
| 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); |
| |
| /** |
| * of_mdiobus_link_phydev - Find a device node for a phy |
| * @mdio: pointer to mii_bus structure |
| * @phydev: phydev for which the of_node pointer should be set |
| * |
| * Walk the list of subnodes of a mdio bus and look for a node that matches the |
| * phy's address with its 'reg' property. If found, set the of_node pointer for |
| * the phy. This allows auto-probed pyh devices to be supplied with information |
| * passed in via DT. |
| */ |
| void of_mdiobus_link_phydev(struct mii_bus *mdio, |
| struct phy_device *phydev) |
| { |
| struct device *dev = &phydev->dev; |
| struct device_node *child; |
| |
| if (dev->of_node || !mdio->dev.of_node) |
| return; |
| |
| for_each_available_child_of_node(mdio->dev.of_node, child) { |
| int addr; |
| |
| addr = of_mdio_parse_addr(&mdio->dev, child); |
| if (addr < 0) |
| continue; |
| |
| if (addr == phydev->addr) { |
| dev->of_node = child; |
| return; |
| } |
| } |
| } |
| |
| /* 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_attach - Attach to a PHY without starting the state machine |
| * @dev: pointer to net_device claiming the phy |
| * @phy_np: Node pointer for the PHY |
| * @flags: flags to pass to the PHY |
| * @iface: PHY data interface type |
| */ |
| struct phy_device *of_phy_attach(struct net_device *dev, |
| struct device_node *phy_np, u32 flags, |
| phy_interface_t iface) |
| { |
| struct phy_device *phy = of_phy_find_device(phy_np); |
| |
| if (!phy) |
| return NULL; |
| |
| return phy_attach_direct(dev, phy, flags, iface) ? NULL : phy; |
| } |
| EXPORT_SYMBOL(of_phy_attach); |
| |
| #if defined(CONFIG_FIXED_PHY) |
| /* |
| * of_phy_is_fixed_link() and of_phy_register_fixed_link() must |
| * support two DT bindings: |
| * - the old DT binding, where 'fixed-link' was a property with 5 |
| * cells encoding various informations about the fixed PHY |
| * - the new DT binding, where 'fixed-link' is a sub-node of the |
| * Ethernet device. |
| */ |
| bool of_phy_is_fixed_link(struct device_node *np) |
| { |
| struct device_node *dn; |
| int len; |
| |
| /* New binding */ |
| dn = of_get_child_by_name(np, "fixed-link"); |
| if (dn) { |
| of_node_put(dn); |
| return true; |
| } |
| |
| /* Old binding */ |
| if (of_get_property(np, "fixed-link", &len) && |
| len == (5 * sizeof(__be32))) |
| return true; |
| |
| return false; |
| } |
| EXPORT_SYMBOL(of_phy_is_fixed_link); |
| |
| int of_phy_register_fixed_link(struct device_node *np) |
| { |
| struct fixed_phy_status status = {}; |
| struct device_node *fixed_link_node; |
| const __be32 *fixed_link_prop; |
| int len; |
| |
| /* New binding */ |
| fixed_link_node = of_get_child_by_name(np, "fixed-link"); |
| if (fixed_link_node) { |
| status.link = 1; |
| status.duplex = of_property_read_bool(np, "full-duplex"); |
| if (of_property_read_u32(fixed_link_node, "speed", &status.speed)) |
| return -EINVAL; |
| status.pause = of_property_read_bool(np, "pause"); |
| status.asym_pause = of_property_read_bool(np, "asym-pause"); |
| of_node_put(fixed_link_node); |
| return fixed_phy_register(PHY_POLL, &status, np); |
| } |
| |
| /* Old binding */ |
| fixed_link_prop = of_get_property(np, "fixed-link", &len); |
| if (fixed_link_prop && len == (5 * sizeof(__be32))) { |
| status.link = 1; |
| status.duplex = be32_to_cpu(fixed_link_prop[1]); |
| status.speed = be32_to_cpu(fixed_link_prop[2]); |
| status.pause = be32_to_cpu(fixed_link_prop[3]); |
| status.asym_pause = be32_to_cpu(fixed_link_prop[4]); |
| return fixed_phy_register(PHY_POLL, &status, np); |
| } |
| |
| return -ENODEV; |
| } |
| EXPORT_SYMBOL(of_phy_register_fixed_link); |
| #endif |