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         int phy_mode;
  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         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 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 4, 0)
  92         phydev->supported &= PHY_GBIT_FEATURES;
  93         phydev->advertising = phydev->supported;
  94 #else
  95         phy_set_max_speed(phydev, SPEED_1000);
  96         linkmode_copy(phydev->advertising, phydev->supported);
  97 #endif
  98         phydev->no_auto_carrier_off = 1;
  99
 100         dev_info(priv->dev,
 101                  "connected port %d to PHY at %s [uid=%08x, driver=%s]\n",
 102                  port, dev_name(&phydev->mdio.dev), phydev->phy_id,
 103                  phydev->drv->name);
 104
 105         priv->phy->phy[port] = phydev;
 106         priv->link[port] = 0;
 107
 108         return 0;
 109 }
 110
 111 static void phy_init(struct fe_priv *priv, struct phy_device *phy)
 112 {
 113         phy_attach(priv->netdev, dev_name(&phy->mdio.dev), PHY_INTERFACE_MODE_MII);
 114
 115         phy->autoneg = AUTONEG_ENABLE;
 116         phy->speed = 0;
 117         phy->duplex = 0;
 118
 119 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 4, 0)
 120         phy->supported &= IS_ENABLED(CONFIG_NET_RALINK_MDIO_MT7620) ?
 121                         PHY_GBIT_FEATURES : PHY_BASIC_FEATURES;
 122         phy->advertising = phy->supported | ADVERTISED_Autoneg;
 123 #else
 124         phy_set_max_speed(phy, IS_ENABLED(CONFIG_NET_RALINK_MDIO_MT7620) ?
 125                                        SPEED_1000 :
 126                                        SPEED_100);
 127         linkmode_copy(phy->advertising, phy->supported);
 128         linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phy->advertising);
 129 #endif
 130
 131         phy_start_aneg(phy);
 132 }
 133
 134 static int fe_phy_connect(struct fe_priv *priv)
 135 {
 136         int i;
 137
 138         for (i = 0; i < 8; i++) {
 139                 if (priv->phy->phy_node[i]) {
 140                         if (!priv->phy_dev) {
 141                                 priv->phy_dev = priv->phy->phy[i];
 142                                 priv->phy_flags = FE_PHY_FLAG_PORT;
 143                         }
 144                 } else if (priv->mii_bus) {
 145                         struct phy_device *phydev;
 146
 147                         phydev = mdiobus_get_phy(priv->mii_bus, i);
 148                         if (!phydev || phydev->attached_dev)
 149                                 continue;
 150
 151                         phy_init(priv, phydev);
 152                         if (!priv->phy_dev) {
 153                                 priv->phy_dev = mdiobus_get_phy(priv->mii_bus, i);
 154                                 priv->phy_flags = FE_PHY_FLAG_ATTACH;
 155                         }
 156                 }
 157         }
 158
 159         return 0;
 160 }
 161
 162 static void fe_phy_disconnect(struct fe_priv *priv)
 163 {
 164         unsigned long flags;
 165         int i;
 166
 167         for (i = 0; i < 8; i++)
 168                 if (priv->phy->phy_fixed[i]) {
 169                         spin_lock_irqsave(&priv->phy->lock, flags);
 170                         priv->link[i] = 0;
 171                         if (priv->soc->mdio_adjust_link)
 172                                 priv->soc->mdio_adjust_link(priv, i);
 173                         spin_unlock_irqrestore(&priv->phy->lock, flags);
 174                 } else if (priv->phy->phy[i]) {
 175                         phy_disconnect(priv->phy->phy[i]);
 176                 } else if (priv->mii_bus && mdiobus_get_phy(priv->mii_bus, i)) {
 177                         phy_detach(mdiobus_get_phy(priv->mii_bus, i));
 178                 }
 179 }
 180
 181 static void fe_phy_start(struct fe_priv *priv)
 182 {
 183         unsigned long flags;
 184         int i;
 185
 186         for (i = 0; i < 8; i++) {
 187                 if (priv->phy->phy_fixed[i]) {
 188                         spin_lock_irqsave(&priv->phy->lock, flags);
 189                         priv->link[i] = 1;
 190                         if (priv->soc->mdio_adjust_link)
 191                                 priv->soc->mdio_adjust_link(priv, i);
 192                         spin_unlock_irqrestore(&priv->phy->lock, flags);
 193                 } else if (priv->phy->phy[i]) {
 194                         phy_start(priv->phy->phy[i]);
 195                 }
 196         }
 197 }
 198
 199 static void fe_phy_stop(struct fe_priv *priv)
 200 {
 201         unsigned long flags;
 202         int i;
 203
 204         for (i = 0; i < 8; i++)
 205                 if (priv->phy->phy_fixed[i]) {
 206                         spin_lock_irqsave(&priv->phy->lock, flags);
 207                         priv->link[i] = 0;
 208                         if (priv->soc->mdio_adjust_link)
 209                                 priv->soc->mdio_adjust_link(priv, i);
 210                         spin_unlock_irqrestore(&priv->phy->lock, flags);
 211                 } else if (priv->phy->phy[i]) {
 212                         phy_stop(priv->phy->phy[i]);
 213                 }
 214 }
 215
 216 static struct fe_phy phy_ralink = {
 217         .connect = fe_phy_connect,
 218         .disconnect = fe_phy_disconnect,
 219         .start = fe_phy_start,
 220         .stop = fe_phy_stop,
 221 };
 222
 223 int fe_mdio_init(struct fe_priv *priv)
 224 {
 225         struct device_node *mii_np;
 226         int err;
 227
 228         if (!priv->soc->mdio_read || !priv->soc->mdio_write)
 229                 return 0;
 230
 231         spin_lock_init(&phy_ralink.lock);
 232         priv->phy = &phy_ralink;
 233
 234         mii_np = of_get_child_by_name(priv->dev->of_node, "mdio-bus");
 235         if (!mii_np) {
 236                 dev_err(priv->dev, "no %s child node found", "mdio-bus");
 237                 return -ENODEV;
 238         }
 239
 240         if (!of_device_is_available(mii_np)) {
 241                 err = 0;
 242                 goto err_put_node;
 243         }
 244
 245         priv->mii_bus = mdiobus_alloc();
 246         if (!priv->mii_bus) {
 247                 err = -ENOMEM;
 248                 goto err_put_node;
 249         }
 250
 251         priv->mii_bus->name = "mdio";
 252         priv->mii_bus->read = priv->soc->mdio_read;
 253         priv->mii_bus->write = priv->soc->mdio_write;
 254         priv->mii_bus->reset = fe_mdio_reset;
 255         priv->mii_bus->priv = priv;
 256         priv->mii_bus->parent = priv->dev;
 257
 258         snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s", mii_np->name);
 259         err = of_mdiobus_register(priv->mii_bus, mii_np);
 260         if (err)
 261                 goto err_free_bus;
 262
 263         return 0;
 264
 265 err_free_bus:
 266         kfree(priv->mii_bus);
 267 err_put_node:
 268         of_node_put(mii_np);
 269         priv->mii_bus = NULL;
 270         return err;
 271 }
 272
 273 void fe_mdio_cleanup(struct fe_priv *priv)
 274 {
 275         if (!priv->mii_bus)
 276                 return;
 277
 278         mdiobus_unregister(priv->mii_bus);
 279         of_node_put(priv->mii_bus->dev.of_node);
 280         kfree(priv->mii_bus);
 281 }