target/linux/ramips/files/drivers/net/ethernet/ralink/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, int port)
  64 {
  65         const __be32 *_phy_addr = NULL;
  66         struct phy_device *phydev;
  67         phy_interface_t phy_mode = PHY_INTERFACE_MODE_NA;
  68
  69         _phy_addr = of_get_property(phy_node, "reg", NULL);
  70
  71         if (!_phy_addr || (be32_to_cpu(*_phy_addr) >= 0x20)) {
  72                 pr_err("%s: invalid phy id\n", phy_node->name);
  73                 return -EINVAL;
  74         }
  75
  76         of_get_phy_mode(phy_node, &phy_mode);
  77         if (phy_mode == PHY_INTERFACE_MODE_NA) {
  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         phy_set_max_speed(phydev, SPEED_1000);
  92         linkmode_copy(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
 114         phy_set_max_speed(phy, IS_ENABLED(CONFIG_NET_RALINK_MDIO_MT7620) ?
 115                                        SPEED_1000 :
 116                                        SPEED_100);
 117         linkmode_copy(phy->advertising, phy->supported);
 118         linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phy->advertising);
 119
 120         phy_start_aneg(phy);
 121 }
 122
 123 static int fe_phy_connect(struct fe_priv *priv)
 124 {
 125         int i;
 126
 127         for (i = 0; i < 8; i++) {
 128                 if (priv->phy->phy_node[i]) {
 129                         if (!priv->phy_dev) {
 130                                 priv->phy_dev = priv->phy->phy[i];
 131                                 priv->phy_flags = FE_PHY_FLAG_PORT;
 132                         }
 133                 } else if (priv->mii_bus) {
 134                         struct phy_device *phydev;
 135
 136                         phydev = mdiobus_get_phy(priv->mii_bus, i);
 137                         if (!phydev || phydev->attached_dev)
 138                                 continue;
 139
 140                         phy_init(priv, phydev);
 141                         if (!priv->phy_dev) {
 142                                 priv->phy_dev = mdiobus_get_phy(priv->mii_bus, i);
 143                                 priv->phy_flags = FE_PHY_FLAG_ATTACH;
 144                         }
 145                 }
 146         }
 147
 148         return 0;
 149 }
 150
 151 static void fe_phy_disconnect(struct fe_priv *priv)
 152 {
 153         unsigned long flags;
 154         int i;
 155
 156         for (i = 0; i < 8; i++)
 157                 if (priv->phy->phy_fixed[i]) {
 158                         spin_lock_irqsave(&priv->phy->lock, flags);
 159                         priv->link[i] = 0;
 160                         if (priv->soc->mdio_adjust_link)
 161                                 priv->soc->mdio_adjust_link(priv, i);
 162                         spin_unlock_irqrestore(&priv->phy->lock, flags);
 163                 } else if (priv->phy->phy[i]) {
 164                         phy_disconnect(priv->phy->phy[i]);
 165                 } else if (priv->mii_bus && mdiobus_get_phy(priv->mii_bus, i)) {
 166                         phy_detach(mdiobus_get_phy(priv->mii_bus, i));
 167                 }
 168 }
 169
 170 static void fe_phy_start(struct fe_priv *priv)
 171 {
 172         unsigned long flags;
 173         int i;
 174
 175         for (i = 0; i < 8; i++) {
 176                 if (priv->phy->phy_fixed[i]) {
 177                         spin_lock_irqsave(&priv->phy->lock, flags);
 178                         priv->link[i] = 1;
 179                         if (priv->soc->mdio_adjust_link)
 180                                 priv->soc->mdio_adjust_link(priv, i);
 181                         spin_unlock_irqrestore(&priv->phy->lock, flags);
 182                 } else if (priv->phy->phy[i]) {
 183                         phy_start(priv->phy->phy[i]);
 184                 }
 185         }
 186 }
 187
 188 static void fe_phy_stop(struct fe_priv *priv)
 189 {
 190         unsigned long flags;
 191         int i;
 192
 193         for (i = 0; i < 8; i++)
 194                 if (priv->phy->phy_fixed[i]) {
 195                         spin_lock_irqsave(&priv->phy->lock, flags);
 196                         priv->link[i] = 0;
 197                         if (priv->soc->mdio_adjust_link)
 198                                 priv->soc->mdio_adjust_link(priv, i);
 199                         spin_unlock_irqrestore(&priv->phy->lock, flags);
 200                 } else if (priv->phy->phy[i]) {
 201                         phy_stop(priv->phy->phy[i]);
 202                 }
 203 }
 204
 205 static struct fe_phy phy_ralink = {
 206         .connect = fe_phy_connect,
 207         .disconnect = fe_phy_disconnect,
 208         .start = fe_phy_start,
 209         .stop = fe_phy_stop,
 210 };
 211
 212 int fe_mdio_init(struct fe_priv *priv)
 213 {
 214         struct device_node *mii_np;
 215         int err;
 216
 217         if (!priv->soc->mdio_read || !priv->soc->mdio_write)
 218                 return 0;
 219
 220         spin_lock_init(&phy_ralink.lock);
 221         priv->phy = &phy_ralink;
 222
 223         mii_np = of_get_child_by_name(priv->dev->of_node, "mdio-bus");
 224         if (!mii_np) {
 225                 dev_err(priv->dev, "no %s child node found", "mdio-bus");
 226                 err = 0;
 227                 goto err_no_bus;
 228         }
 229
 230         if (!of_device_is_available(mii_np)) {
 231                 err = 0;
 232                 goto err_put_node;
 233         }
 234
 235         priv->mii_bus = mdiobus_alloc();
 236         if (!priv->mii_bus) {
 237                 err = -ENOMEM;
 238                 goto err_put_node;
 239         }
 240
 241         priv->mii_bus->name = "mdio";
 242         priv->mii_bus->read = priv->soc->mdio_read;
 243         priv->mii_bus->write = priv->soc->mdio_write;
 244         priv->mii_bus->reset = fe_mdio_reset;
 245         priv->mii_bus->priv = priv;
 246         priv->mii_bus->parent = priv->dev;
 247
 248         snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s", mii_np->name);
 249         err = of_mdiobus_register(priv->mii_bus, mii_np);
 250         if (err)
 251                 goto err_free_bus;
 252
 253         return 0;
 254
 255 err_free_bus:
 256         kfree(priv->mii_bus);
 257 err_put_node:
 258         of_node_put(mii_np);
 259 err_no_bus:
 260         dev_err(priv->dev, "%s disabled", "mdio-bus");
 261         priv->mii_bus = NULL;
 262         return err;
 263 }
 264
 265 void fe_mdio_cleanup(struct fe_priv *priv)
 266 {
 267         if (!priv->mii_bus)
 268                 return;
 269
 270         mdiobus_unregister(priv->mii_bus);
 271         of_node_put(priv->mii_bus->dev.of_node);
 272         kfree(priv->mii_bus);
 273 }