drivers/net/usb/ax88172a.c

   1 /*
   2  * ASIX AX88172A based USB 2.0 Ethernet Devices
   3  * Copyright (C) 2012 OMICRON electronics GmbH
   4  *
   5  * Supports external PHYs via phylib. Based on the driver for the
   6  * AX88772. Original copyrights follow:
   7  *
   8  * Copyright (C) 2003-2006 David Hollis <dhollis@davehollis.com>
   9  * Copyright (C) 2005 Phil Chang <pchang23@sbcglobal.net>
  10  * Copyright (C) 2006 James Painter <jamie.painter@iname.com>
  11  * Copyright (c) 2002-2003 TiVo Inc.
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  25  */
  26
  27 #include "asix.h"
  28 #include <linux/phy.h>
  29
  30 struct ax88172a_private {
  31         struct mii_bus *mdio;
  32         struct phy_device *phydev;
  33         char phy_name[20];
  34         u16 phy_addr;
  35         u16 oldmode;
  36         int use_embdphy;
  37         struct asix_rx_fixup_info rx_fixup_info;
  38 };
  39
  40 /* MDIO read and write wrappers for phylib */
  41 static int asix_mdio_bus_read(struct mii_bus *bus, int phy_id, int regnum)
  42 {
  43         return asix_mdio_read(((struct usbnet *)bus->priv)->net, phy_id,
  44                               regnum);
  45 }
  46
  47 static int asix_mdio_bus_write(struct mii_bus *bus, int phy_id, int regnum,
  48                                u16 val)
  49 {
  50         asix_mdio_write(((struct usbnet *)bus->priv)->net, phy_id, regnum, val);
  51         return 0;
  52 }
  53
  54 static int ax88172a_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
  55 {
  56         if (!netif_running(net))
  57                 return -EINVAL;
  58
  59         if (!net->phydev)
  60                 return -ENODEV;
  61
  62         return phy_mii_ioctl(net->phydev, rq, cmd);
  63 }
  64
  65 /* set MAC link settings according to information from phylib */
  66 static void ax88172a_adjust_link(struct net_device *netdev)
  67 {
  68         struct phy_device *phydev = netdev->phydev;
  69         struct usbnet *dev = netdev_priv(netdev);
  70         struct ax88172a_private *priv = dev->driver_priv;
  71         u16 mode = 0;
  72
  73         if (phydev->link) {
  74                 mode = AX88772_MEDIUM_DEFAULT;
  75
  76                 if (phydev->duplex == DUPLEX_HALF)
  77                         mode &= ~AX_MEDIUM_FD;
  78
  79                 if (phydev->speed != SPEED_100)
  80                         mode &= ~AX_MEDIUM_PS;
  81         }
  82
  83         if (mode != priv->oldmode) {
  84                 asix_write_medium_mode(dev, mode, 0);
  85                 priv->oldmode = mode;
  86                 netdev_dbg(netdev, "speed %u duplex %d, setting mode to 0x%04x\n",
  87                            phydev->speed, phydev->duplex, mode);
  88                 phy_print_status(phydev);
  89         }
  90 }
  91
  92 static void ax88172a_status(struct usbnet *dev, struct urb *urb)
  93 {
  94         /* link changes are detected by polling the phy */
  95 }
  96
  97 /* use phylib infrastructure */
  98 static int ax88172a_init_mdio(struct usbnet *dev)
  99 {
 100         struct ax88172a_private *priv = dev->driver_priv;
 101         int ret;
 102
 103         priv->mdio = mdiobus_alloc();
 104         if (!priv->mdio) {
 105                 netdev_err(dev->net, "Could not allocate MDIO bus\n");
 106                 return -ENOMEM;
 107         }
 108
 109         priv->mdio->priv = (void *)dev;
 110         priv->mdio->read = &asix_mdio_bus_read;
 111         priv->mdio->write = &asix_mdio_bus_write;
 112         priv->mdio->name = "Asix MDIO Bus";
 113         /* mii bus name is usb-<usb bus number>-<usb device number> */
 114         snprintf(priv->mdio->id, MII_BUS_ID_SIZE, "usb-%03d:%03d",
 115                  dev->udev->bus->busnum, dev->udev->devnum);
 116
 117         ret = mdiobus_register(priv->mdio);
 118         if (ret) {
 119                 netdev_err(dev->net, "Could not register MDIO bus\n");
 120                 goto mfree;
 121         }
 122
 123         netdev_info(dev->net, "registered mdio bus %s\n", priv->mdio->id);
 124         return 0;
 125
 126 mfree:
 127         mdiobus_free(priv->mdio);
 128         return ret;
 129 }
 130
 131 static void ax88172a_remove_mdio(struct usbnet *dev)
 132 {
 133         struct ax88172a_private *priv = dev->driver_priv;
 134
 135         netdev_info(dev->net, "deregistering mdio bus %s\n", priv->mdio->id);
 136         mdiobus_unregister(priv->mdio);
 137         mdiobus_free(priv->mdio);
 138 }
 139
 140 static const struct net_device_ops ax88172a_netdev_ops = {
 141         .ndo_open               = usbnet_open,
 142         .ndo_stop               = usbnet_stop,
 143         .ndo_start_xmit         = usbnet_start_xmit,
 144         .ndo_tx_timeout         = usbnet_tx_timeout,
 145         .ndo_change_mtu         = usbnet_change_mtu,
 146         .ndo_set_mac_address    = asix_set_mac_address,
 147         .ndo_validate_addr      = eth_validate_addr,
 148         .ndo_do_ioctl           = ax88172a_ioctl,
 149         .ndo_set_rx_mode        = asix_set_multicast,
 150 };
 151
 152 static int ax88172a_nway_reset(struct net_device *net)
 153 {
 154         if (!net->phydev)
 155                 return -ENODEV;
 156
 157         return phy_start_aneg(net->phydev);
 158 }
 159
 160 static const struct ethtool_ops ax88172a_ethtool_ops = {
 161         .get_drvinfo            = asix_get_drvinfo,
 162         .get_link               = usbnet_get_link,
 163         .get_msglevel           = usbnet_get_msglevel,
 164         .set_msglevel           = usbnet_set_msglevel,
 165         .get_wol                = asix_get_wol,
 166         .set_wol                = asix_set_wol,
 167         .get_eeprom_len         = asix_get_eeprom_len,
 168         .get_eeprom             = asix_get_eeprom,
 169         .set_eeprom             = asix_set_eeprom,
 170         .nway_reset             = ax88172a_nway_reset,
 171         .get_link_ksettings     = phy_ethtool_get_link_ksettings,
 172         .set_link_ksettings     = phy_ethtool_set_link_ksettings,
 173 };
 174
 175 static int ax88172a_reset_phy(struct usbnet *dev, int embd_phy)
 176 {
 177         int ret;
 178
 179         ret = asix_sw_reset(dev, AX_SWRESET_IPPD, 0);
 180         if (ret < 0)
 181                 goto err;
 182
 183         msleep(150);
 184         ret = asix_sw_reset(dev, AX_SWRESET_CLEAR, 0);
 185         if (ret < 0)
 186                 goto err;
 187
 188         msleep(150);
 189
 190         ret = asix_sw_reset(dev, embd_phy ? AX_SWRESET_IPRL : AX_SWRESET_IPPD,
 191                             0);
 192         if (ret < 0)
 193                 goto err;
 194
 195         return 0;
 196
 197 err:
 198         return ret;
 199 }
 200
 201
 202 static int ax88172a_bind(struct usbnet *dev, struct usb_interface *intf)
 203 {
 204         int ret;
 205         u8 buf[ETH_ALEN];
 206         struct ax88172a_private *priv;
 207
 208         usbnet_get_endpoints(dev, intf);
 209
 210         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 211         if (!priv)
 212                 return -ENOMEM;
 213
 214         dev->driver_priv = priv;
 215
 216         /* Get the MAC address */
 217         ret = asix_read_cmd(dev, AX_CMD_READ_NODE_ID, 0, 0, ETH_ALEN, buf, 0);
 218         if (ret < 0) {
 219                 netdev_err(dev->net, "Failed to read MAC address: %d\n", ret);
 220                 goto free;
 221         }
 222         memcpy(dev->net->dev_addr, buf, ETH_ALEN);
 223
 224         dev->net->netdev_ops = &ax88172a_netdev_ops;
 225         dev->net->ethtool_ops = &ax88172a_ethtool_ops;
 226
 227         /* are we using the internal or the external phy? */
 228         ret = asix_read_cmd(dev, AX_CMD_SW_PHY_STATUS, 0, 0, 1, buf, 0);
 229         if (ret < 0) {
 230                 netdev_err(dev->net, "Failed to read software interface selection register: %d\n",
 231                            ret);
 232                 goto free;
 233         }
 234
 235         netdev_dbg(dev->net, "AX_CMD_SW_PHY_STATUS = 0x%02x\n", buf[0]);
 236         switch (buf[0] & AX_PHY_SELECT_MASK) {
 237         case AX_PHY_SELECT_INTERNAL:
 238                 netdev_dbg(dev->net, "use internal phy\n");
 239                 priv->use_embdphy = 1;
 240                 break;
 241         case AX_PHY_SELECT_EXTERNAL:
 242                 netdev_dbg(dev->net, "use external phy\n");
 243                 priv->use_embdphy = 0;
 244                 break;
 245         default:
 246                 netdev_err(dev->net, "Interface mode not supported by driver\n");
 247                 ret = -ENOTSUPP;
 248                 goto free;
 249         }
 250
 251         priv->phy_addr = asix_read_phy_addr(dev, priv->use_embdphy);
 252         ax88172a_reset_phy(dev, priv->use_embdphy);
 253
 254         /* Asix framing packs multiple eth frames into a 2K usb bulk transfer */
 255         if (dev->driver_info->flags & FLAG_FRAMING_AX) {
 256                 /* hard_mtu  is still the default - the device does not support
 257                    jumbo eth frames */
 258                 dev->rx_urb_size = 2048;
 259         }
 260
 261         /* init MDIO bus */
 262         ret = ax88172a_init_mdio(dev);
 263         if (ret)
 264                 goto free;
 265
 266         return 0;
 267
 268 free:
 269         kfree(priv);
 270         return ret;
 271 }
 272
 273 static int ax88172a_stop(struct usbnet *dev)
 274 {
 275         struct ax88172a_private *priv = dev->driver_priv;
 276
 277         netdev_dbg(dev->net, "Stopping interface\n");
 278
 279         if (priv->phydev) {
 280                 netdev_info(dev->net, "Disconnecting from phy %s\n",
 281                             priv->phy_name);
 282                 phy_stop(priv->phydev);
 283                 phy_disconnect(priv->phydev);
 284         }
 285
 286         return 0;
 287 }
 288
 289 static void ax88172a_unbind(struct usbnet *dev, struct usb_interface *intf)
 290 {
 291         struct ax88172a_private *priv = dev->driver_priv;
 292
 293         ax88172a_remove_mdio(dev);
 294         kfree(priv);
 295 }
 296
 297 static int ax88172a_reset(struct usbnet *dev)
 298 {
 299         struct asix_data *data = (struct asix_data *)&dev->data;
 300         struct ax88172a_private *priv = dev->driver_priv;
 301         int ret;
 302         u16 rx_ctl;
 303
 304         ax88172a_reset_phy(dev, priv->use_embdphy);
 305
 306         msleep(150);
 307         rx_ctl = asix_read_rx_ctl(dev, 0);
 308         netdev_dbg(dev->net, "RX_CTL is 0x%04x after software reset\n", rx_ctl);
 309         ret = asix_write_rx_ctl(dev, 0x0000, 0);
 310         if (ret < 0)
 311                 goto out;
 312
 313         rx_ctl = asix_read_rx_ctl(dev, 0);
 314         netdev_dbg(dev->net, "RX_CTL is 0x%04x setting to 0x0000\n", rx_ctl);
 315
 316         msleep(150);
 317
 318         ret = asix_write_cmd(dev, AX_CMD_WRITE_IPG0,
 319                              AX88772_IPG0_DEFAULT | AX88772_IPG1_DEFAULT,
 320                              AX88772_IPG2_DEFAULT, 0, NULL, 0);
 321         if (ret < 0) {
 322                 netdev_err(dev->net, "Write IPG,IPG1,IPG2 failed: %d\n", ret);
 323                 goto out;
 324         }
 325
 326         /* Rewrite MAC address */
 327         memcpy(data->mac_addr, dev->net->dev_addr, ETH_ALEN);
 328         ret = asix_write_cmd(dev, AX_CMD_WRITE_NODE_ID, 0, 0, ETH_ALEN,
 329                              data->mac_addr, 0);
 330         if (ret < 0)
 331                 goto out;
 332
 333         /* Set RX_CTL to default values with 2k buffer, and enable cactus */
 334         ret = asix_write_rx_ctl(dev, AX_DEFAULT_RX_CTL, 0);
 335         if (ret < 0)
 336                 goto out;
 337
 338         rx_ctl = asix_read_rx_ctl(dev, 0);
 339         netdev_dbg(dev->net, "RX_CTL is 0x%04x after all initializations\n",
 340                    rx_ctl);
 341
 342         rx_ctl = asix_read_medium_status(dev, 0);
 343         netdev_dbg(dev->net, "Medium Status is 0x%04x after all initializations\n",
 344                    rx_ctl);
 345
 346         /* Connect to PHY */
 347         snprintf(priv->phy_name, 20, PHY_ID_FMT,
 348                  priv->mdio->id, priv->phy_addr);
 349
 350         priv->phydev = phy_connect(dev->net, priv->phy_name,
 351                                    &ax88172a_adjust_link,
 352                                    PHY_INTERFACE_MODE_MII);
 353         if (IS_ERR(priv->phydev)) {
 354                 netdev_err(dev->net, "Could not connect to PHY device %s\n",
 355                            priv->phy_name);
 356                 ret = PTR_ERR(priv->phydev);
 357                 goto out;
 358         }
 359
 360         netdev_info(dev->net, "Connected to phy %s\n", priv->phy_name);
 361
 362         /* During power-up, the AX88172A set the power down (BMCR_PDOWN)
 363          * bit of the PHY. Bring the PHY up again.
 364          */
 365         genphy_resume(priv->phydev);
 366         phy_start(priv->phydev);
 367
 368         return 0;
 369
 370 out:
 371         return ret;
 372
 373 }
 374
 375 static int ax88172a_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
 376 {
 377         struct ax88172a_private *dp = dev->driver_priv;
 378         struct asix_rx_fixup_info *rx = &dp->rx_fixup_info;
 379
 380         return asix_rx_fixup_internal(dev, skb, rx);
 381 }
 382
 383 const struct driver_info ax88172a_info = {
 384         .description = "ASIX AX88172A USB 2.0 Ethernet",
 385         .bind = ax88172a_bind,
 386         .reset = ax88172a_reset,
 387         .stop = ax88172a_stop,
 388         .unbind = ax88172a_unbind,
 389         .status = ax88172a_status,
 390         .flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_LINK_INTR |
 391                  FLAG_MULTI_PACKET,
 392         .rx_fixup = ax88172a_rx_fixup,
 393         .tx_fixup = asix_tx_fixup,
 394 };