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 &= IS_ENABLED(CONFIG_NET_MEDIATEK_MDIO_MT7620) ?
 114                         PHY_GBIT_FEATURES : PHY_BASIC_FEATURES;
 115         phy->advertising = phy->supported | ADVERTISED_Autoneg;
 116
 117         phy_start_aneg(phy);
 118 }
 119
 120 static int fe_phy_connect(struct fe_priv *priv)
 121 {
 122         int i;
 123
 124         for (i = 0; i < 8; i++) {
 125                 if (priv->phy->phy_node[i]) {
 126                         if (!priv->phy_dev) {
 127                                 priv->phy_dev = priv->phy->phy[i];
 128                                 priv->phy_flags = FE_PHY_FLAG_PORT;
 129                         }
 130                 } else if (priv->mii_bus) {
 131                         struct phy_device *phydev;
 132
 133                         phydev = mdiobus_get_phy(priv->mii_bus, i);
 134                         if (!phydev || phydev->attached_dev)
 135                                 continue;
 136
 137                         phy_init(priv, phydev);
 138                         if (!priv->phy_dev) {
 139                                 priv->phy_dev = mdiobus_get_phy(priv->mii_bus, i);
 140                                 priv->phy_flags = FE_PHY_FLAG_ATTACH;
 141                         }
 142                 }
 143         }
 144
 145         return 0;
 146 }
 147
 148 static void fe_phy_disconnect(struct fe_priv *priv)
 149 {
 150         unsigned long flags;
 151         int i;
 152
 153         for (i = 0; i < 8; i++)
 154                 if (priv->phy->phy_fixed[i]) {
 155                         spin_lock_irqsave(&priv->phy->lock, flags);
 156                         priv->link[i] = 0;
 157                         if (priv->soc->mdio_adjust_link)
 158                                 priv->soc->mdio_adjust_link(priv, i);
 159                         spin_unlock_irqrestore(&priv->phy->lock, flags);
 160                 } else if (priv->phy->phy[i]) {
 161                         phy_disconnect(priv->phy->phy[i]);
 162                 } else if (priv->mii_bus && mdiobus_get_phy(priv->mii_bus, i)) {
 163                         phy_detach(mdiobus_get_phy(priv->mii_bus, i));
 164                 }
 165 }
 166
 167 static void fe_phy_start(struct fe_priv *priv)
 168 {
 169         unsigned long flags;
 170         int i;
 171
 172         for (i = 0; i < 8; i++) {
 173                 if (priv->phy->phy_fixed[i]) {
 174                         spin_lock_irqsave(&priv->phy->lock, flags);
 175                         priv->link[i] = 1;
 176                         if (priv->soc->mdio_adjust_link)
 177                                 priv->soc->mdio_adjust_link(priv, i);
 178                         spin_unlock_irqrestore(&priv->phy->lock, flags);
 179                 } else if (priv->phy->phy[i]) {
 180                         phy_start(priv->phy->phy[i]);
 181                 }
 182         }
 183 }
 184
 185 static void fe_phy_stop(struct fe_priv *priv)
 186 {
 187         unsigned long flags;
 188         int i;
 189
 190         for (i = 0; i < 8; i++)
 191                 if (priv->phy->phy_fixed[i]) {
 192                         spin_lock_irqsave(&priv->phy->lock, flags);
 193                         priv->link[i] = 0;
 194                         if (priv->soc->mdio_adjust_link)
 195                                 priv->soc->mdio_adjust_link(priv, i);
 196                         spin_unlock_irqrestore(&priv->phy->lock, flags);
 197                 } else if (priv->phy->phy[i]) {
 198                         phy_stop(priv->phy->phy[i]);
 199                 }
 200 }
 201
 202 static struct fe_phy phy_ralink = {
 203         .connect = fe_phy_connect,
 204         .disconnect = fe_phy_disconnect,
 205         .start = fe_phy_start,
 206         .stop = fe_phy_stop,
 207 };
 208
 209 int fe_mdio_init(struct fe_priv *priv)
 210 {
 211         struct device_node *mii_np;
 212         int err;
 213
 214         if (!priv->soc->mdio_read || !priv->soc->mdio_write)
 215                 return 0;
 216
 217         spin_lock_init(&phy_ralink.lock);
 218         priv->phy = &phy_ralink;
 219
 220         mii_np = of_get_child_by_name(priv->dev->of_node, "mdio-bus");
 221         if (!mii_np) {
 222                 dev_err(priv->dev, "no %s child node found", "mdio-bus");
 223                 return -ENODEV;
 224         }
 225
 226         if (!of_device_is_available(mii_np)) {
 227                 err = 0;
 228                 goto err_put_node;
 229         }
 230
 231         priv->mii_bus = mdiobus_alloc();
 232         if (!priv->mii_bus) {
 233                 err = -ENOMEM;
 234                 goto err_put_node;
 235         }
 236
 237         priv->mii_bus->name = "mdio";
 238         priv->mii_bus->read = priv->soc->mdio_read;
 239         priv->mii_bus->write = priv->soc->mdio_write;
 240         priv->mii_bus->reset = fe_mdio_reset;
 241         priv->mii_bus->priv = priv;
 242         priv->mii_bus->parent = priv->dev;
 243
 244         snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s", mii_np->name);
 245         err = of_mdiobus_register(priv->mii_bus, mii_np);
 246         if (err)
 247                 goto err_free_bus;
 248
 249         return 0;
 250
 251 err_free_bus:
 252         kfree(priv->mii_bus);
 253 err_put_node:
 254         of_node_put(mii_np);
 255         priv->mii_bus = NULL;
 256         return err;
 257 }
 258
 259 void fe_mdio_cleanup(struct fe_priv *priv)
 260 {
 261         if (!priv->mii_bus)
 262                 return;
 263
 264         mdiobus_unregister(priv->mii_bus);
 265         of_node_put(priv->mii_bus->dev.of_node);
 266         kfree(priv->mii_bus);
 267 }