323 lines
8.0 KiB
C
Executable File
323 lines
8.0 KiB
C
Executable File
/*
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* OF helpers for the MDIO (Ethernet PHY) API
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*
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* Copyright (c) 2009 Secret Lab Technologies, Ltd.
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*
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* This file is released under the GPLv2
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*
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* This file provides helper functions for extracting PHY device information
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* out of the OpenFirmware device tree and using it to populate an mii_bus.
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/netdevice.h>
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#include <linux/err.h>
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#include <linux/phy.h>
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#include <linux/phy_fixed.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/of_mdio.h>
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#include <linux/module.h>
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MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
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MODULE_LICENSE("GPL");
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/* Extract the clause 22 phy ID from the compatible string of the form
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* ethernet-phy-idAAAA.BBBB */
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static int of_get_phy_id(struct device_node *device, u32 *phy_id)
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{
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struct property *prop;
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const char *cp;
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unsigned int upper, lower;
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of_property_for_each_string(device, "compatible", prop, cp) {
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if (sscanf(cp, "ethernet-phy-id%4x.%4x", &upper, &lower) == 2) {
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*phy_id = ((upper & 0xFFFF) << 16) | (lower & 0xFFFF);
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return 0;
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}
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}
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return -EINVAL;
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}
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static int of_mdiobus_register_phy(struct mii_bus *mdio, struct device_node *child,
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u32 addr)
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{
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struct phy_device *phy;
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bool is_c45;
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int rc;
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u32 phy_id;
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is_c45 = of_device_is_compatible(child,
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"ethernet-phy-ieee802.3-c45");
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if (!is_c45 && !of_get_phy_id(child, &phy_id))
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phy = phy_device_create(mdio, addr, phy_id, 0, NULL);
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else
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phy = get_phy_device(mdio, addr, is_c45);
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if (!phy || IS_ERR(phy))
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return 1;
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rc = irq_of_parse_and_map(child, 0);
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if (rc > 0) {
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phy->irq = rc;
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if (mdio->irq)
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mdio->irq[addr] = rc;
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} else {
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if (mdio->irq)
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phy->irq = mdio->irq[addr];
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}
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/* Associate the OF node with the device structure so it
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* can be looked up later */
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of_node_get(child);
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phy->dev.of_node = child;
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/* All data is now stored in the phy struct;
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* register it */
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rc = phy_device_register(phy);
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if (rc) {
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phy_device_free(phy);
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of_node_put(child);
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return 1;
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}
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dev_dbg(&mdio->dev, "registered phy %s at address %i\n",
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child->name, addr);
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return 0;
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}
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static int of_mdio_parse_addr(struct device *dev, const struct device_node *np)
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{
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u32 addr;
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int ret;
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ret = of_property_read_u32(np, "reg", &addr);
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if (ret < 0) {
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dev_err(dev, "%s has invalid PHY address\n", np->full_name);
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return ret;
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}
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/* A PHY must have a reg property in the range [0-31] */
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if (addr >= PHY_MAX_ADDR) {
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dev_err(dev, "%s PHY address %i is too large\n",
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np->full_name, addr);
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return -EINVAL;
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}
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return addr;
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}
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/**
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* of_mdiobus_register - Register mii_bus and create PHYs from the device tree
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* @mdio: pointer to mii_bus structure
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* @np: pointer to device_node of MDIO bus.
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*
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* This function registers the mii_bus structure and registers a phy_device
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* for each child node of @np.
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*/
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int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
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{
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struct device_node *child;
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const __be32 *paddr;
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bool scanphys = false;
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int addr, rc, i;
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/* Mask out all PHYs from auto probing. Instead the PHYs listed in
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* the device tree are populated after the bus has been registered */
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mdio->phy_mask = ~0;
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/* Clear all the IRQ properties */
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if (mdio->irq)
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for (i=0; i<PHY_MAX_ADDR; i++)
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mdio->irq[i] = PHY_POLL;
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mdio->dev.of_node = np;
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/* Register the MDIO bus */
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rc = mdiobus_register(mdio);
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if (rc)
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return rc;
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/* Loop over the child nodes and register a phy_device for each one */
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for_each_available_child_of_node(np, child) {
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addr = of_mdio_parse_addr(&mdio->dev, child);
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if (addr < 0) {
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scanphys = true;
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continue;
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}
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rc = of_mdiobus_register_phy(mdio, child, addr);
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if (rc)
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continue;
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}
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if (!scanphys)
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return 0;
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/* auto scan for PHYs with empty reg property */
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for_each_available_child_of_node(np, child) {
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/* Skip PHYs with reg property set */
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paddr = of_get_property(child, "reg", NULL);
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if (paddr)
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continue;
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for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
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/* skip already registered PHYs */
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if (mdio->phy_map[addr])
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continue;
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/* be noisy to encourage people to set reg property */
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dev_info(&mdio->dev, "scan phy %s at address %i\n",
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child->name, addr);
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rc = of_mdiobus_register_phy(mdio, child, addr);
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if (rc)
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continue;
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}
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}
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return 0;
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}
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EXPORT_SYMBOL(of_mdiobus_register);
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/* Helper function for of_phy_find_device */
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static int of_phy_match(struct device *dev, void *phy_np)
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{
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return dev->of_node == phy_np;
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}
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/**
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* of_phy_find_device - Give a PHY node, find the phy_device
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* @phy_np: Pointer to the phy's device tree node
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*
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* Returns a pointer to the phy_device.
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*/
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struct phy_device *of_phy_find_device(struct device_node *phy_np)
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{
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struct device *d;
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if (!phy_np)
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return NULL;
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d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match);
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return d ? to_phy_device(d) : NULL;
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}
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EXPORT_SYMBOL(of_phy_find_device);
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/**
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* of_phy_connect - Connect to the phy described in the device tree
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* @dev: pointer to net_device claiming the phy
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* @phy_np: Pointer to device tree node for the PHY
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* @hndlr: Link state callback for the network device
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* @iface: PHY data interface type
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*
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* Returns a pointer to the phy_device if successful. NULL otherwise
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*/
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struct phy_device *of_phy_connect(struct net_device *dev,
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struct device_node *phy_np,
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void (*hndlr)(struct net_device *), u32 flags,
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phy_interface_t iface)
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{
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struct phy_device *phy = of_phy_find_device(phy_np);
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if (!phy)
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return NULL;
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phy->dev_flags = flags;
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return phy_connect_direct(dev, phy, hndlr, iface) ? NULL : phy;
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}
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EXPORT_SYMBOL(of_phy_connect);
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/**
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* of_phy_attach - Attach to a PHY without starting the state machine
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* @dev: pointer to net_device claiming the phy
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* @phy_np: Node pointer for the PHY
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* @flags: flags to pass to the PHY
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* @iface: PHY data interface type
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*/
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struct phy_device *of_phy_attach(struct net_device *dev,
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struct device_node *phy_np, u32 flags,
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phy_interface_t iface)
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{
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struct phy_device *phy = of_phy_find_device(phy_np);
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if (!phy)
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return NULL;
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return phy_attach_direct(dev, phy, flags, iface) ? NULL : phy;
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}
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EXPORT_SYMBOL(of_phy_attach);
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#if defined(CONFIG_FIXED_PHY)
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/*
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* of_phy_is_fixed_link() and of_phy_register_fixed_link() must
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* support two DT bindings:
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* - the old DT binding, where 'fixed-link' was a property with 5
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* cells encoding various informations about the fixed PHY
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* - the new DT binding, where 'fixed-link' is a sub-node of the
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* Ethernet device.
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*/
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bool of_phy_is_fixed_link(struct device_node *np)
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{
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struct device_node *dn;
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int len;
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/* New binding */
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dn = of_get_child_by_name(np, "fixed-link");
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if (dn) {
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of_node_put(dn);
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return true;
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}
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/* Old binding */
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if (of_get_property(np, "fixed-link", &len) &&
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len == (5 * sizeof(__be32)))
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return true;
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return false;
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}
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EXPORT_SYMBOL(of_phy_is_fixed_link);
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int of_phy_register_fixed_link(struct device_node *np)
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{
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struct fixed_phy_status status = {};
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struct device_node *fixed_link_node;
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const __be32 *fixed_link_prop;
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int len;
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struct phy_device *phy;
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/* New binding */
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fixed_link_node = of_get_child_by_name(np, "fixed-link");
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if (fixed_link_node) {
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status.link = 1;
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status.duplex = of_property_read_bool(fixed_link_node,
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"full-duplex");
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if (of_property_read_u32(fixed_link_node, "speed", &status.speed))
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return -EINVAL;
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status.pause = of_property_read_bool(fixed_link_node, "pause");
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status.asym_pause = of_property_read_bool(fixed_link_node,
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"asym-pause");
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of_node_put(fixed_link_node);
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phy = fixed_phy_register(PHY_POLL, &status, np);
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return IS_ERR(phy) ? PTR_ERR(phy) : 0;
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}
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/* Old binding */
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fixed_link_prop = of_get_property(np, "fixed-link", &len);
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if (fixed_link_prop && len == (5 * sizeof(__be32))) {
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status.link = 1;
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status.duplex = be32_to_cpu(fixed_link_prop[1]);
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status.speed = be32_to_cpu(fixed_link_prop[2]);
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status.pause = be32_to_cpu(fixed_link_prop[3]);
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status.asym_pause = be32_to_cpu(fixed_link_prop[4]);
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phy = fixed_phy_register(PHY_POLL, &status, np);
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return IS_ERR(phy) ? PTR_ERR(phy) : 0;
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}
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return -ENODEV;
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}
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EXPORT_SYMBOL(of_phy_register_fixed_link);
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#endif
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