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- /*
- * 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_gpio.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];
- }
- if (of_property_read_bool(child, "broken-turn-around"))
- mdio->phy_ignore_ta_mask |= 1 << 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;
- }
- 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;
- }
- EXPORT_SYMBOL(of_mdio_parse_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);
- /* 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
- *
- * If successful, returns a pointer to the phy_device with the embedded
- * struct device refcount incremented by one, or NULL on failure.
- */
- 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
- *
- * If successful, returns a pointer to the phy_device with the embedded
- * struct device refcount incremented by one, or NULL on failure. The
- * refcount must be dropped by calling phy_disconnect() or phy_detach().
- */
- 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);
- int ret;
- if (!phy)
- return NULL;
- phy->dev_flags = flags;
- ret = phy_connect_direct(dev, phy, hndlr, iface);
- /* refcount is held by phy_connect_direct() on success */
- put_device(&phy->dev);
- return ret ? 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
- *
- * If successful, returns a pointer to the phy_device with the embedded
- * struct device refcount incremented by one, or NULL on failure. The
- * refcount must be dropped by calling phy_disconnect() or phy_detach().
- */
- 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);
- int ret;
- if (!phy)
- return NULL;
- ret = phy_attach_direct(dev, phy, flags, iface);
- /* refcount is held by phy_attach_direct() on success */
- put_device(&phy->dev);
- return ret ? 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, err;
- const char *managed;
- /* New binding */
- dn = of_get_child_by_name(np, "fixed-link");
- if (dn) {
- of_node_put(dn);
- return true;
- }
- err = of_property_read_string(np, "managed", &managed);
- if (err == 0 && strcmp(managed, "auto") != 0)
- 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 link_gpio;
- int len, err;
- struct phy_device *phy;
- const char *managed;
- err = of_property_read_string(np, "managed", &managed);
- if (err == 0) {
- if (strcmp(managed, "in-band-status") == 0) {
- /* status is zeroed, namely its .link member */
- phy = fixed_phy_register(PHY_POLL, &status, -1, np);
- return IS_ERR(phy) ? PTR_ERR(phy) : 0;
- }
- }
- /* 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(fixed_link_node,
- "full-duplex");
- if (of_property_read_u32(fixed_link_node, "speed", &status.speed))
- return -EINVAL;
- status.pause = of_property_read_bool(fixed_link_node, "pause");
- status.asym_pause = of_property_read_bool(fixed_link_node,
- "asym-pause");
- link_gpio = of_get_named_gpio_flags(fixed_link_node,
- "link-gpios", 0, NULL);
- of_node_put(fixed_link_node);
- if (link_gpio == -EPROBE_DEFER)
- return -EPROBE_DEFER;
- phy = fixed_phy_register(PHY_POLL, &status, link_gpio, np);
- return IS_ERR(phy) ? PTR_ERR(phy) : 0;
- }
- /* 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]);
- phy = fixed_phy_register(PHY_POLL, &status, -1, np);
- return IS_ERR(phy) ? PTR_ERR(phy) : 0;
- }
- return -ENODEV;
- }
- EXPORT_SYMBOL(of_phy_register_fixed_link);
- #endif
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