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8bc487d150
Add support for parsing the device tree for PHY devices on an MDIO bus. Currently many of the PowerPC ethernet drivers are open coding a solution for reading data out of the device tree to find the correct PHY device. This patch implements a set of common routines to: a) let MDIO bus drivers register phy_devices described in the tree, and b) let MAC drivers find the correct phy_device via the tree. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Andy Fleming <afleming@freescale.com> Signed-off-by: David S. Miller <davem@davemloft.net>
140 lines
3.6 KiB
C
140 lines
3.6 KiB
C
/*
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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/phy.h>
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#include <linux/of.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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/**
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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 phy_device *phy;
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struct device_node *child;
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int 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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/* 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_child_of_node(np, child) {
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const u32 *addr;
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int len;
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/* A PHY must have a reg property in the range [0-31] */
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addr = of_get_property(child, "reg", &len);
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if (!addr || len < sizeof(*addr) || *addr >= 32 || *addr < 0) {
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dev_err(&mdio->dev, "%s has invalid PHY address\n",
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child->full_name);
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continue;
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}
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if (mdio->irq) {
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mdio->irq[*addr] = irq_of_parse_and_map(child, 0);
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if (!mdio->irq[*addr])
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mdio->irq[*addr] = PHY_POLL;
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}
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phy = get_phy_device(mdio, *addr);
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if (!phy) {
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dev_err(&mdio->dev, "error probing PHY at address %i\n",
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*addr);
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continue;
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}
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phy_scan_fixups(phy);
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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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dev_archdata_set_node(&phy->dev.archdata, child);
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/* All data is now stored in the phy struct; 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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continue;
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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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}
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return 0;
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}
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EXPORT_SYMBOL(of_mdiobus_register);
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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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int match(struct device *dev, void *phy_np)
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{
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return dev_archdata_get_node(&dev->archdata) == phy_np;
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}
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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, 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 successfull. 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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return phy_connect_direct(dev, phy, hndlr, flags, iface) ? NULL : phy;
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}
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EXPORT_SYMBOL(of_phy_connect);
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