linux/drivers/of/of_mdio.c
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   1/*
   2 * OF helpers for the MDIO (Ethernet PHY) API
   3 *
   4 * Copyright (c) 2009 Secret Lab Technologies, Ltd.
   5 *
   6 * This file is released under the GPLv2
   7 *
   8 * This file provides helper functions for extracting PHY device information
   9 * out of the OpenFirmware device tree and using it to populate an mii_bus.
  10 */
  11
  12#include <linux/kernel.h>
  13#include <linux/device.h>
  14#include <linux/netdevice.h>
  15#include <linux/err.h>
  16#include <linux/phy.h>
  17#include <linux/of.h>
  18#include <linux/of_irq.h>
  19#include <linux/of_mdio.h>
  20#include <linux/module.h>
  21
  22MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
  23MODULE_LICENSE("GPL");
  24
  25/**
  26 * of_mdiobus_register - Register mii_bus and create PHYs from the device tree
  27 * @mdio: pointer to mii_bus structure
  28 * @np: pointer to device_node of MDIO bus.
  29 *
  30 * This function registers the mii_bus structure and registers a phy_device
  31 * for each child node of @np.
  32 */
  33int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
  34{
  35        struct phy_device *phy;
  36        struct device_node *child;
  37        const __be32 *paddr;
  38        u32 addr;
  39        bool is_c45, scanphys = false;
  40        int rc, i, len;
  41
  42        /* Mask out all PHYs from auto probing.  Instead the PHYs listed in
  43         * the device tree are populated after the bus has been registered */
  44        mdio->phy_mask = ~0;
  45
  46        /* Clear all the IRQ properties */
  47        if (mdio->irq)
  48                for (i=0; i<PHY_MAX_ADDR; i++)
  49                        mdio->irq[i] = PHY_POLL;
  50
  51        mdio->dev.of_node = np;
  52
  53        /* Register the MDIO bus */
  54        rc = mdiobus_register(mdio);
  55        if (rc)
  56                return rc;
  57
  58        /* Loop over the child nodes and register a phy_device for each one */
  59        for_each_available_child_of_node(np, child) {
  60                /* A PHY must have a reg property in the range [0-31] */
  61                paddr = of_get_property(child, "reg", &len);
  62                if (!paddr || len < sizeof(*paddr)) {
  63                        scanphys = true;
  64                        dev_err(&mdio->dev, "%s has invalid PHY address\n",
  65                                child->full_name);
  66                        continue;
  67                }
  68
  69                addr = be32_to_cpup(paddr);
  70                if (addr >= 32) {
  71                        dev_err(&mdio->dev, "%s PHY address %i is too large\n",
  72                                child->full_name, addr);
  73                        continue;
  74                }
  75
  76                if (mdio->irq) {
  77                        mdio->irq[addr] = irq_of_parse_and_map(child, 0);
  78                        if (!mdio->irq[addr])
  79                                mdio->irq[addr] = PHY_POLL;
  80                }
  81
  82                is_c45 = of_device_is_compatible(child,
  83                                                 "ethernet-phy-ieee802.3-c45");
  84                phy = get_phy_device(mdio, addr, is_c45);
  85
  86                if (!phy || IS_ERR(phy)) {
  87                        dev_err(&mdio->dev,
  88                                "cannot get PHY at address %i\n",
  89                                addr);
  90                        continue;
  91                }
  92
  93                /* Associate the OF node with the device structure so it
  94                 * can be looked up later */
  95                of_node_get(child);
  96                phy->dev.of_node = child;
  97
  98                /* All data is now stored in the phy struct; register it */
  99                rc = phy_device_register(phy);
 100                if (rc) {
 101                        phy_device_free(phy);
 102                        of_node_put(child);
 103                        continue;
 104                }
 105
 106                dev_dbg(&mdio->dev, "registered phy %s at address %i\n",
 107                        child->name, addr);
 108        }
 109
 110        if (!scanphys)
 111                return 0;
 112
 113        /* auto scan for PHYs with empty reg property */
 114        for_each_available_child_of_node(np, child) {
 115                /* Skip PHYs with reg property set */
 116                paddr = of_get_property(child, "reg", &len);
 117                if (paddr)
 118                        continue;
 119
 120                is_c45 = of_device_is_compatible(child,
 121                                                 "ethernet-phy-ieee802.3-c45");
 122
 123                for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
 124                        /* skip already registered PHYs */
 125                        if (mdio->phy_map[addr])
 126                                continue;
 127
 128                        /* be noisy to encourage people to set reg property */
 129                        dev_info(&mdio->dev, "scan phy %s at address %i\n",
 130                                 child->name, addr);
 131
 132                        phy = get_phy_device(mdio, addr, is_c45);
 133                        if (!phy || IS_ERR(phy))
 134                                continue;
 135
 136                        if (mdio->irq) {
 137                                mdio->irq[addr] =
 138                                        irq_of_parse_and_map(child, 0);
 139                                if (!mdio->irq[addr])
 140                                        mdio->irq[addr] = PHY_POLL;
 141                        }
 142
 143                        /* Associate the OF node with the device structure so it
 144                         * can be looked up later */
 145                        of_node_get(child);
 146                        phy->dev.of_node = child;
 147
 148                        /* All data is now stored in the phy struct;
 149                         * register it */
 150                        rc = phy_device_register(phy);
 151                        if (rc) {
 152                                phy_device_free(phy);
 153                                of_node_put(child);
 154                                continue;
 155                        }
 156
 157                        dev_info(&mdio->dev, "registered phy %s at address %i\n",
 158                                 child->name, addr);
 159                        break;
 160                }
 161        }
 162
 163        return 0;
 164}
 165EXPORT_SYMBOL(of_mdiobus_register);
 166
 167/* Helper function for of_phy_find_device */
 168static int of_phy_match(struct device *dev, void *phy_np)
 169{
 170        return dev->of_node == phy_np;
 171}
 172
 173/**
 174 * of_phy_find_device - Give a PHY node, find the phy_device
 175 * @phy_np: Pointer to the phy's device tree node
 176 *
 177 * Returns a pointer to the phy_device.
 178 */
 179struct phy_device *of_phy_find_device(struct device_node *phy_np)
 180{
 181        struct device *d;
 182        if (!phy_np)
 183                return NULL;
 184
 185        d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match);
 186        return d ? to_phy_device(d) : NULL;
 187}
 188EXPORT_SYMBOL(of_phy_find_device);
 189
 190/**
 191 * of_phy_connect - Connect to the phy described in the device tree
 192 * @dev: pointer to net_device claiming the phy
 193 * @phy_np: Pointer to device tree node for the PHY
 194 * @hndlr: Link state callback for the network device
 195 * @iface: PHY data interface type
 196 *
 197 * Returns a pointer to the phy_device if successful.  NULL otherwise
 198 */
 199struct phy_device *of_phy_connect(struct net_device *dev,
 200                                  struct device_node *phy_np,
 201                                  void (*hndlr)(struct net_device *), u32 flags,
 202                                  phy_interface_t iface)
 203{
 204        struct phy_device *phy = of_phy_find_device(phy_np);
 205
 206        if (!phy)
 207                return NULL;
 208
 209        return phy_connect_direct(dev, phy, hndlr, iface) ? NULL : phy;
 210}
 211EXPORT_SYMBOL(of_phy_connect);
 212
 213/**
 214 * of_phy_connect_fixed_link - Parse fixed-link property and return a dummy phy
 215 * @dev: pointer to net_device claiming the phy
 216 * @hndlr: Link state callback for the network device
 217 * @iface: PHY data interface type
 218 *
 219 * This function is a temporary stop-gap and will be removed soon.  It is
 220 * only to support the fs_enet, ucc_geth and gianfar Ethernet drivers.  Do
 221 * not call this function from new drivers.
 222 */
 223struct phy_device *of_phy_connect_fixed_link(struct net_device *dev,
 224                                             void (*hndlr)(struct net_device *),
 225                                             phy_interface_t iface)
 226{
 227        struct device_node *net_np;
 228        char bus_id[MII_BUS_ID_SIZE + 3];
 229        struct phy_device *phy;
 230        const __be32 *phy_id;
 231        int sz;
 232
 233        if (!dev->dev.parent)
 234                return NULL;
 235
 236        net_np = dev->dev.parent->of_node;
 237        if (!net_np)
 238                return NULL;
 239
 240        phy_id = of_get_property(net_np, "fixed-link", &sz);
 241        if (!phy_id || sz < sizeof(*phy_id))
 242                return NULL;
 243
 244        sprintf(bus_id, PHY_ID_FMT, "fixed-0", be32_to_cpu(phy_id[0]));
 245
 246        phy = phy_connect(dev, bus_id, hndlr, iface);
 247        return IS_ERR(phy) ? NULL : phy;
 248}
 249EXPORT_SYMBOL(of_phy_connect_fixed_link);
 250
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