target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/mdio.c

   1 /*   This program is free software; you can redistribute it and/or modify
   2  *   it under the terms of the GNU General Public License as published by
   3  *   the Free Software Foundation; version 2 of the License
   4  *
   5  *   Copyright (C) 2009-2015 John Crispin <blogic@openwrt.org>
   6  *   Copyright (C) 2009-2015 Felix Fietkau <nbd@nbd.name>
   7  *   Copyright (C) 2013-2015 Michael Lee <igvtee@gmail.com>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/phy.h>
  13 #include <linux/of_net.h>
  14 #include <linux/of_mdio.h>
  15
  16 #include "mtk_eth_soc.h"
  17 #include "mdio.h"
  18
  19 static int fe_mdio_reset(struct mii_bus *bus)
  20 {
  21         /* TODO */
  22         return 0;
  23 }
  24
  25 static void fe_phy_link_adjust(struct net_device *dev)
  26 {
  27         struct fe_priv *priv = netdev_priv(dev);
  28         unsigned long flags;
  29         int i;
  30
  31         spin_lock_irqsave(&priv->phy->lock, flags);
  32         for (i = 0; i < 8; i++) {
  33                 if (priv->phy->phy_node[i]) {
  34                         struct phy_device *phydev = priv->phy->phy[i];
  35                         int status_change = 0;
  36
  37                         if (phydev->link)
  38                                 if (priv->phy->duplex[i] != phydev->duplex ||
  39                                     priv->phy->speed[i] != phydev->speed)
  40                                         status_change = 1;
  41
  42                         if (phydev->link != priv->link[i])
  43                                 status_change = 1;
  44
  45                         switch (phydev->speed) {
  46                         case SPEED_1000:
  47                         case SPEED_100:
  48                         case SPEED_10:
  49                                 priv->link[i] = phydev->link;
  50                                 priv->phy->duplex[i] = phydev->duplex;
  51                                 priv->phy->speed[i] = phydev->speed;
  52
  53                                 if (status_change &&
  54                                     priv->soc->mdio_adjust_link)
  55                                         priv->soc->mdio_adjust_link(priv, i);
  56                                 break;
  57                         }
  58                 }
  59         }
  60         spin_unlock_irqrestore(&priv->phy->lock, flags);
  61 }
  62
  63 int fe_connect_phy_node(struct fe_priv *priv, struct device_node *phy_node)
  64 {
  65         const __be32 *_port = NULL;
  66         struct phy_device *phydev;
  67         int phy_mode, port;
  68
  69         _port = of_get_property(phy_node, "reg", NULL);
  70
  71         if (!_port || (be32_to_cpu(*_port) >= 0x20)) {
  72                 pr_err("%s: invalid port id\n", phy_node->name);
  73                 return -EINVAL;
  74         }
  75         port = be32_to_cpu(*_port);
  76         phy_mode = of_get_phy_mode(phy_node);
  77         if (phy_mode < 0) {
  78                 dev_err(priv->dev, "incorrect phy-mode %d\n", phy_mode);
  79                 priv->phy->phy_node[port] = NULL;
  80                 return -EINVAL;
  81         }
  82
  83         phydev = of_phy_connect(priv->netdev, phy_node, fe_phy_link_adjust,
  84                                 0, phy_mode);
  85         if (!phydev) {
  86                 dev_err(priv->dev, "could not connect to PHY\n");
  87                 priv->phy->phy_node[port] = NULL;
  88                 return -ENODEV;
  89         }
  90
  91         phydev->supported &= PHY_GBIT_FEATURES;
  92         phydev->advertising = phydev->supported;
  93         phydev->no_auto_carrier_off = 1;
  94
  95         dev_info(priv->dev,
  96                  "connected port %d to PHY at %s [uid=%08x, driver=%s]\n",
  97                  port, dev_name(&phydev->mdio.dev), phydev->phy_id,
  98                  phydev->drv->name);
  99
 100         priv->phy->phy[port] = phydev;
 101         priv->link[port] = 0;
 102
 103         return 0;
 104 }
 105
 106 static void phy_init(struct fe_priv *priv, struct phy_device *phy)
 107 {
 108         phy_attach(priv->netdev, dev_name(&phy->mdio.dev), PHY_INTERFACE_MODE_MII);
 109
 110         phy->autoneg = AUTONEG_ENABLE;
 111         phy->speed = 0;
 112         phy->duplex = 0;
 113         phy->supported &= PHY_BASIC_FEATURES;
 114         phy->advertising = phy->supported | ADVERTISED_Autoneg;
 115
 116         phy_start_aneg(phy);
 117 }
 118
 119 static int fe_phy_connect(struct fe_priv *priv)
 120 {
 121         int i;
 122
 123         for (i = 0; i < 8; i++) {
 124                 if (priv->phy->phy_node[i]) {
 125                         if (!priv->phy_dev) {
 126                                 priv->phy_dev = priv->phy->phy[i];
 127                                 priv->phy_flags = FE_PHY_FLAG_PORT;
 128                         }
 129                 } else if (priv->mii_bus && mdiobus_get_phy(priv->mii_bus, i)) {
 130                         phy_init(priv, mdiobus_get_phy(priv->mii_bus, i));
 131                         if (!priv->phy_dev) {
 132                                 priv->phy_dev = mdiobus_get_phy(priv->mii_bus, i);
 133                                 priv->phy_flags = FE_PHY_FLAG_ATTACH;
 134                         }
 135                 }
 136         }
 137
 138         return 0;
 139 }
 140
 141 static void fe_phy_disconnect(struct fe_priv *priv)
 142 {
 143         unsigned long flags;
 144         int i;
 145
 146         for (i = 0; i < 8; i++)
 147                 if (priv->phy->phy_fixed[i]) {
 148                         spin_lock_irqsave(&priv->phy->lock, flags);
 149                         priv->link[i] = 0;
 150                         if (priv->soc->mdio_adjust_link)
 151                                 priv->soc->mdio_adjust_link(priv, i);
 152                         spin_unlock_irqrestore(&priv->phy->lock, flags);
 153                 } else if (priv->phy->phy[i]) {
 154                         phy_disconnect(priv->phy->phy[i]);
 155                 } else if (priv->mii_bus && mdiobus_get_phy(priv->mii_bus, i)) {
 156                         phy_detach(mdiobus_get_phy(priv->mii_bus, i));
 157                 }
 158 }
 159
 160 static void fe_phy_start(struct fe_priv *priv)
 161 {
 162         unsigned long flags;
 163         int i;
 164
 165         for (i = 0; i < 8; i++) {
 166                 if (priv->phy->phy_fixed[i]) {
 167                         spin_lock_irqsave(&priv->phy->lock, flags);
 168                         priv->link[i] = 1;
 169                         if (priv->soc->mdio_adjust_link)
 170                                 priv->soc->mdio_adjust_link(priv, i);
 171                         spin_unlock_irqrestore(&priv->phy->lock, flags);
 172                 } else if (priv->phy->phy[i]) {
 173                         phy_start(priv->phy->phy[i]);
 174                 }
 175         }
 176 }
 177
 178 static void fe_phy_stop(struct fe_priv *priv)
 179 {
 180         unsigned long flags;
 181         int i;
 182
 183         for (i = 0; i < 8; i++)
 184                 if (priv->phy->phy_fixed[i]) {
 185                         spin_lock_irqsave(&priv->phy->lock, flags);
 186                         priv->link[i] = 0;
 187                         if (priv->soc->mdio_adjust_link)
 188                                 priv->soc->mdio_adjust_link(priv, i);
 189                         spin_unlock_irqrestore(&priv->phy->lock, flags);
 190                 } else if (priv->phy->phy[i]) {
 191                         phy_stop(priv->phy->phy[i]);
 192                 }
 193 }
 194
 195 static struct fe_phy phy_ralink = {
 196         .connect = fe_phy_connect,
 197         .disconnect = fe_phy_disconnect,
 198         .start = fe_phy_start,
 199         .stop = fe_phy_stop,
 200 };
 201
 202 int fe_mdio_init(struct fe_priv *priv)
 203 {
 204         struct device_node *mii_np;
 205         int err;
 206
 207         if (!priv->soc->mdio_read || !priv->soc->mdio_write)
 208                 return 0;
 209
 210         spin_lock_init(&phy_ralink.lock);
 211         priv->phy = &phy_ralink;
 212
 213         mii_np = of_get_child_by_name(priv->dev->of_node, "mdio-bus");
 214         if (!mii_np) {
 215                 dev_err(priv->dev, "no %s child node found", "mdio-bus");
 216                 return -ENODEV;
 217         }
 218
 219         if (!of_device_is_available(mii_np)) {
 220                 err = 0;
 221                 goto err_put_node;
 222         }
 223
 224         priv->mii_bus = mdiobus_alloc();
 225         if (!priv->mii_bus) {
 226                 err = -ENOMEM;
 227                 goto err_put_node;
 228         }
 229
 230         priv->mii_bus->name = "mdio";
 231         priv->mii_bus->read = priv->soc->mdio_read;
 232         priv->mii_bus->write = priv->soc->mdio_write;
 233         priv->mii_bus->reset = fe_mdio_reset;
 234         priv->mii_bus->priv = priv;
 235         priv->mii_bus->parent = priv->dev;
 236
 237         snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s", mii_np->name);
 238         err = of_mdiobus_register(priv->mii_bus, mii_np);
 239         if (err)
 240                 goto err_free_bus;
 241
 242         return 0;
 243
 244 err_free_bus:
 245         kfree(priv->mii_bus);
 246 err_put_node:
 247         of_node_put(mii_np);
 248         priv->mii_bus = NULL;
 249         return err;
 250 }
 251
 252 void fe_mdio_cleanup(struct fe_priv *priv)
 253 {
 254         if (!priv->mii_bus)
 255                 return;
 256
 257         mdiobus_unregister(priv->mii_bus);
 258         of_node_put(priv->mii_bus->dev.of_node);
 259         kfree(priv->mii_bus);
 260 }