drivers/staging/mt7621-eth/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) 2009-2016 John Crispin <blogic@openwrt.org>
   6  *   Copyright (C) 2009-2016 Felix Fietkau <nbd@openwrt.org>
   7  *   Copyright (C) 2013-2016 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 mtk_mdio_reset(struct mii_bus *bus)
  20 {
  21         /* TODO */
  22         return 0;
  23 }
  24
  25 static void mtk_phy_link_adjust(struct net_device *dev)
  26 {
  27         struct mtk_eth *eth = netdev_priv(dev);
  28         unsigned long flags;
  29         int i;
  30
  31         spin_lock_irqsave(&eth->phy->lock, flags);
  32         for (i = 0; i < 8; i++) {
  33                 if (eth->phy->phy_node[i]) {
  34                         struct phy_device *phydev = eth->phy->phy[i];
  35                         int status_change = 0;
  36
  37                         if (phydev->link)
  38                                 if (eth->phy->duplex[i] != phydev->duplex ||
  39                                     eth->phy->speed[i] != phydev->speed)
  40                                         status_change = 1;
  41
  42                         if (phydev->link != eth->link[i])
  43                                 status_change = 1;
  44
  45                         switch (phydev->speed) {
  46                         case SPEED_1000:
  47                         case SPEED_100:
  48                         case SPEED_10:
  49                                 eth->link[i] = phydev->link;
  50                                 eth->phy->duplex[i] = phydev->duplex;
  51                                 eth->phy->speed[i] = phydev->speed;
  52
  53                                 if (status_change &&
  54                                     eth->soc->mdio_adjust_link)
  55                                         eth->soc->mdio_adjust_link(eth, i);
  56                                 break;
  57                         }
  58                 }
  59         }
  60 }
  61
  62 int mtk_connect_phy_node(struct mtk_eth *eth, struct mtk_mac *mac,
  63                          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(eth->dev, "incorrect phy-mode %d\n", phy_mode);
  79                 eth->phy->phy_node[port] = NULL;
  80                 return -EINVAL;
  81         }
  82
  83         phydev = of_phy_connect(eth->netdev[mac->id], phy_node,
  84                                 mtk_phy_link_adjust, 0, phy_mode);
  85         if (!phydev) {
  86                 dev_err(eth->dev, "could not connect to PHY\n");
  87                 eth->phy->phy_node[port] = NULL;
  88                 return -ENODEV;
  89         }
  90
  91         phydev->supported &= PHY_GBIT_FEATURES;
  92         phydev->advertising = phydev->supported;
  93
  94         dev_info(eth->dev,
  95                  "connected port %d to PHY at %s [uid=%08x, driver=%s]\n",
  96                  port, phydev_name(phydev), phydev->phy_id,
  97                  phydev->drv->name);
  98
  99         eth->phy->phy[port] = phydev;
 100         eth->link[port] = 0;
 101
 102         return 0;
 103 }
 104
 105 static void phy_init(struct mtk_eth *eth, struct mtk_mac *mac,
 106                      struct phy_device *phy)
 107 {
 108         phy_attach(eth->netdev[mac->id], phydev_name(phy),
 109                    PHY_INTERFACE_MODE_MII);
 110
 111         phy->autoneg = AUTONEG_ENABLE;
 112         phy->speed = 0;
 113         phy->duplex = 0;
 114         phy->supported &= PHY_BASIC_FEATURES;
 115         phy->advertising = phy->supported | ADVERTISED_Autoneg;
 116
 117         phy_start_aneg(phy);
 118 }
 119
 120 static int mtk_phy_connect(struct mtk_mac *mac)
 121 {
 122         struct mtk_eth *eth = mac->hw;
 123         int i;
 124
 125         for (i = 0; i < 8; i++) {
 126                 if (eth->phy->phy_node[i]) {
 127                         if (!mac->phy_dev) {
 128                                 mac->phy_dev = eth->phy->phy[i];
 129                                 mac->phy_flags = MTK_PHY_FLAG_PORT;
 130                         }
 131                 } else if (eth->mii_bus) {
 132                         struct phy_device *phy;
 133                         phy = mdiobus_get_phy(eth->mii_bus, i);
 134                         if (phy) {
 135                                 phy_init(eth, mac, phy);
 136                                 if (!mac->phy_dev) {
 137                                         mac->phy_dev = phy;
 138                                         mac->phy_flags = MTK_PHY_FLAG_ATTACH;
 139                                 }
 140                         }
 141                 }
 142         }
 143
 144         return 0;
 145 }
 146
 147 static void mtk_phy_disconnect(struct mtk_mac *mac)
 148 {
 149         struct mtk_eth *eth = mac->hw;
 150         unsigned long flags;
 151         int i;
 152
 153         for (i = 0; i < 8; i++)
 154                 if (eth->phy->phy_fixed[i]) {
 155                         spin_lock_irqsave(&eth->phy->lock, flags);
 156                         eth->link[i] = 0;
 157                         if (eth->soc->mdio_adjust_link)
 158                                 eth->soc->mdio_adjust_link(eth, i);
 159                         spin_unlock_irqrestore(&eth->phy->lock, flags);
 160                 } else if (eth->phy->phy[i]) {
 161                         phy_disconnect(eth->phy->phy[i]);
 162                 } else if (eth->mii_bus) {
 163                         struct phy_device *phy = mdiobus_get_phy(eth->mii_bus, i);
 164                         if (phy)
 165                                 phy_detach(phy);
 166                 }
 167 }
 168
 169 static void mtk_phy_start(struct mtk_mac *mac)
 170 {
 171         struct mtk_eth *eth = mac->hw;
 172         unsigned long flags;
 173         int i;
 174
 175         for (i = 0; i < 8; i++) {
 176                 if (eth->phy->phy_fixed[i]) {
 177                         spin_lock_irqsave(&eth->phy->lock, flags);
 178                         eth->link[i] = 1;
 179                         if (eth->soc->mdio_adjust_link)
 180                                 eth->soc->mdio_adjust_link(eth, i);
 181                         spin_unlock_irqrestore(&eth->phy->lock, flags);
 182                 } else if (eth->phy->phy[i]) {
 183                         phy_start(eth->phy->phy[i]);
 184                 }
 185         }
 186 }
 187
 188 static void mtk_phy_stop(struct mtk_mac *mac)
 189 {
 190         struct mtk_eth *eth = mac->hw;
 191         unsigned long flags;
 192         int i;
 193
 194         for (i = 0; i < 8; i++)
 195                 if (eth->phy->phy_fixed[i]) {
 196                         spin_lock_irqsave(&eth->phy->lock, flags);
 197                         eth->link[i] = 0;
 198                         if (eth->soc->mdio_adjust_link)
 199                                 eth->soc->mdio_adjust_link(eth, i);
 200                         spin_unlock_irqrestore(&eth->phy->lock, flags);
 201                 } else if (eth->phy->phy[i]) {
 202                         phy_stop(eth->phy->phy[i]);
 203                 }
 204 }
 205
 206 static struct mtk_phy phy_ralink = {
 207         .connect = mtk_phy_connect,
 208         .disconnect = mtk_phy_disconnect,
 209         .start = mtk_phy_start,
 210         .stop = mtk_phy_stop,
 211 };
 212
 213 int mtk_mdio_init(struct mtk_eth *eth)
 214 {
 215         struct device_node *mii_np;
 216         int err;
 217
 218         if (!eth->soc->mdio_read || !eth->soc->mdio_write)
 219                 return 0;
 220
 221         spin_lock_init(&phy_ralink.lock);
 222         eth->phy = &phy_ralink;
 223
 224         mii_np = of_get_child_by_name(eth->dev->of_node, "mdio-bus");
 225         if (!mii_np) {
 226                 dev_err(eth->dev, "no %s child node found", "mdio-bus");
 227                 return -ENODEV;
 228         }
 229
 230         if (!of_device_is_available(mii_np)) {
 231                 err = 0;
 232                 goto err_put_node;
 233         }
 234
 235         eth->mii_bus = mdiobus_alloc();
 236         if (!eth->mii_bus) {
 237                 err = -ENOMEM;
 238                 goto err_put_node;
 239         }
 240
 241         eth->mii_bus->name = "mdio";
 242         eth->mii_bus->read = eth->soc->mdio_read;
 243         eth->mii_bus->write = eth->soc->mdio_write;
 244         eth->mii_bus->reset = mtk_mdio_reset;
 245         eth->mii_bus->priv = eth;
 246         eth->mii_bus->parent = eth->dev;
 247
 248         snprintf(eth->mii_bus->id, MII_BUS_ID_SIZE, "%s", mii_np->name);
 249         err = of_mdiobus_register(eth->mii_bus, mii_np);
 250         if (err)
 251                 goto err_free_bus;
 252
 253         return 0;
 254
 255 err_free_bus:
 256         kfree(eth->mii_bus);
 257 err_put_node:
 258         of_node_put(mii_np);
 259         eth->mii_bus = NULL;
 260         return err;
 261 }
 262
 263 void mtk_mdio_cleanup(struct mtk_eth *eth)
 264 {
 265         if (!eth->mii_bus)
 266                 return;
 267
 268         mdiobus_unregister(eth->mii_bus);
 269         of_node_put(eth->mii_bus->dev.of_node);
 270         kfree(eth->mii_bus);
 271 }