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);
  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, i;
 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         priv->mdio->irq = kzalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
 118         if (!priv->mdio->irq) {
 119                 ret = -ENOMEM;
 120                 goto mfree;
 121         }
 122         for (i = 0; i < PHY_MAX_ADDR; i++)
 123                 priv->mdio->irq[i] = PHY_POLL;
 124
 125         ret = mdiobus_register(priv->mdio);
 126         if (ret) {
 127                 netdev_err(dev->net, "Could not register MDIO bus\n");
 128                 goto ifree;
 129         }
 130
 131         netdev_info(dev->net, "registered mdio bus %s\n", priv->mdio->id);
 132         return 0;
 133
 134 ifree:
 135         kfree(priv->mdio->irq);
 136 mfree:
 137         mdiobus_free(priv->mdio);
 138         return ret;
 139 }
 140
 141 static void ax88172a_remove_mdio(struct usbnet *dev)
 142 {
 143         struct ax88172a_private *priv = dev->driver_priv;
 144
 145         netdev_info(dev->net, "deregistering mdio bus %s\n", priv->mdio->id);
 146         mdiobus_unregister(priv->mdio);
 147         kfree(priv->mdio->irq);
 148         mdiobus_free(priv->mdio);
 149 }
 150
 151 static const struct net_device_ops ax88172a_netdev_ops = {
 152         .ndo_open               = usbnet_open,
 153         .ndo_stop               = usbnet_stop,
 154         .ndo_start_xmit         = usbnet_start_xmit,
 155         .ndo_tx_timeout         = usbnet_tx_timeout,
 156         .ndo_change_mtu         = usbnet_change_mtu,
 157         .ndo_set_mac_address    = asix_set_mac_address,
 158         .ndo_validate_addr      = eth_validate_addr,
 159         .ndo_do_ioctl           = ax88172a_ioctl,
 160         .ndo_set_rx_mode        = asix_set_multicast,
 161 };
 162
 163 static int ax88172a_get_settings(struct net_device *net,
 164                                  struct ethtool_cmd *cmd)
 165 {
 166         if (!net->phydev)
 167                 return -ENODEV;
 168
 169         return phy_ethtool_gset(net->phydev, cmd);
 170 }
 171
 172 static int ax88172a_set_settings(struct net_device *net,
 173                                  struct ethtool_cmd *cmd)
 174 {
 175         if (!net->phydev)
 176                 return -ENODEV;
 177
 178         return phy_ethtool_sset(net->phydev, cmd);
 179 }
 180
 181 static int ax88172a_nway_reset(struct net_device *net)
 182 {
 183         if (!net->phydev)
 184                 return -ENODEV;
 185
 186         return phy_start_aneg(net->phydev);
 187 }
 188
 189 static const struct ethtool_ops ax88172a_ethtool_ops = {
 190         .get_drvinfo            = asix_get_drvinfo,
 191         .get_link               = usbnet_get_link,
 192         .get_msglevel           = usbnet_get_msglevel,
 193         .set_msglevel           = usbnet_set_msglevel,
 194         .get_wol                = asix_get_wol,
 195         .set_wol                = asix_set_wol,
 196         .get_eeprom_len         = asix_get_eeprom_len,
 197         .get_eeprom             = asix_get_eeprom,
 198         .set_eeprom             = asix_set_eeprom,
 199         .get_settings           = ax88172a_get_settings,
 200         .set_settings           = ax88172a_set_settings,
 201         .nway_reset             = ax88172a_nway_reset,
 202 };
 203
 204 static int ax88172a_reset_phy(struct usbnet *dev, int embd_phy)
 205 {
 206         int ret;
 207
 208         ret = asix_sw_reset(dev, AX_SWRESET_IPPD);
 209         if (ret < 0)
 210                 goto err;
 211
 212         msleep(150);
 213         ret = asix_sw_reset(dev, AX_SWRESET_CLEAR);
 214         if (ret < 0)
 215                 goto err;
 216
 217         msleep(150);
 218
 219         ret = asix_sw_reset(dev, embd_phy ? AX_SWRESET_IPRL : AX_SWRESET_IPPD);
 220         if (ret < 0)
 221                 goto err;
 222
 223         return 0;
 224
 225 err:
 226         return ret;
 227 }
 228
 229
 230 static int ax88172a_bind(struct usbnet *dev, struct usb_interface *intf)
 231 {
 232         int ret;
 233         u8 buf[ETH_ALEN];
 234         struct ax88172a_private *priv;
 235
 236         usbnet_get_endpoints(dev, intf);
 237
 238         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 239         if (!priv)
 240                 return -ENOMEM;
 241
 242         dev->driver_priv = priv;
 243
 244         /* Get the MAC address */
 245         ret = asix_read_cmd(dev, AX_CMD_READ_NODE_ID, 0, 0, ETH_ALEN, buf);
 246         if (ret < 0) {
 247                 netdev_err(dev->net, "Failed to read MAC address: %d\n", ret);
 248                 goto free;
 249         }
 250         memcpy(dev->net->dev_addr, buf, ETH_ALEN);
 251
 252         dev->net->netdev_ops = &ax88172a_netdev_ops;
 253         dev->net->ethtool_ops = &ax88172a_ethtool_ops;
 254
 255         /* are we using the internal or the external phy? */
 256         ret = asix_read_cmd(dev, AX_CMD_SW_PHY_STATUS, 0, 0, 1, buf);
 257         if (ret < 0) {
 258                 netdev_err(dev->net, "Failed to read software interface selection register: %d\n",
 259                            ret);
 260                 goto free;
 261         }
 262
 263         netdev_dbg(dev->net, "AX_CMD_SW_PHY_STATUS = 0x%02x\n", buf[0]);
 264         switch (buf[0] & AX_PHY_SELECT_MASK) {
 265         case AX_PHY_SELECT_INTERNAL:
 266                 netdev_dbg(dev->net, "use internal phy\n");
 267                 priv->use_embdphy = 1;
 268                 break;
 269         case AX_PHY_SELECT_EXTERNAL:
 270                 netdev_dbg(dev->net, "use external phy\n");
 271                 priv->use_embdphy = 0;
 272                 break;
 273         default:
 274                 netdev_err(dev->net, "Interface mode not supported by driver\n");
 275                 ret = -ENOTSUPP;
 276                 goto free;
 277         }
 278
 279         priv->phy_addr = asix_read_phy_addr(dev, priv->use_embdphy);
 280         ax88172a_reset_phy(dev, priv->use_embdphy);
 281
 282         /* Asix framing packs multiple eth frames into a 2K usb bulk transfer */
 283         if (dev->driver_info->flags & FLAG_FRAMING_AX) {
 284                 /* hard_mtu  is still the default - the device does not support
 285                    jumbo eth frames */
 286                 dev->rx_urb_size = 2048;
 287         }
 288
 289         /* init MDIO bus */
 290         ret = ax88172a_init_mdio(dev);
 291         if (ret)
 292                 goto free;
 293
 294         return 0;
 295
 296 free:
 297         kfree(priv);
 298         return ret;
 299 }
 300
 301 static int ax88172a_stop(struct usbnet *dev)
 302 {
 303         struct ax88172a_private *priv = dev->driver_priv;
 304
 305         netdev_dbg(dev->net, "Stopping interface\n");
 306
 307         if (priv->phydev) {
 308                 netdev_info(dev->net, "Disconnecting from phy %s\n",
 309                             priv->phy_name);
 310                 phy_stop(priv->phydev);
 311                 phy_disconnect(priv->phydev);
 312         }
 313
 314         return 0;
 315 }
 316
 317 static void ax88172a_unbind(struct usbnet *dev, struct usb_interface *intf)
 318 {
 319         struct ax88172a_private *priv = dev->driver_priv;
 320
 321         ax88172a_remove_mdio(dev);
 322         kfree(priv);
 323 }
 324
 325 static int ax88172a_reset(struct usbnet *dev)
 326 {
 327         struct asix_data *data = (struct asix_data *)&dev->data;
 328         struct ax88172a_private *priv = dev->driver_priv;
 329         int ret;
 330         u16 rx_ctl;
 331
 332         ax88172a_reset_phy(dev, priv->use_embdphy);
 333
 334         msleep(150);
 335         rx_ctl = asix_read_rx_ctl(dev);
 336         netdev_dbg(dev->net, "RX_CTL is 0x%04x after software reset\n", rx_ctl);
 337         ret = asix_write_rx_ctl(dev, 0x0000);
 338         if (ret < 0)
 339                 goto out;
 340
 341         rx_ctl = asix_read_rx_ctl(dev);
 342         netdev_dbg(dev->net, "RX_CTL is 0x%04x setting to 0x0000\n", rx_ctl);
 343
 344         msleep(150);
 345
 346         ret = asix_write_cmd(dev, AX_CMD_WRITE_IPG0,
 347                              AX88772_IPG0_DEFAULT | AX88772_IPG1_DEFAULT,
 348                              AX88772_IPG2_DEFAULT, 0, NULL);
 349         if (ret < 0) {
 350                 netdev_err(dev->net, "Write IPG,IPG1,IPG2 failed: %d\n", ret);
 351                 goto out;
 352         }
 353
 354         /* Rewrite MAC address */
 355         memcpy(data->mac_addr, dev->net->dev_addr, ETH_ALEN);
 356         ret = asix_write_cmd(dev, AX_CMD_WRITE_NODE_ID, 0, 0, ETH_ALEN,
 357                              data->mac_addr);
 358         if (ret < 0)
 359                 goto out;
 360
 361         /* Set RX_CTL to default values with 2k buffer, and enable cactus */
 362         ret = asix_write_rx_ctl(dev, AX_DEFAULT_RX_CTL);
 363         if (ret < 0)
 364                 goto out;
 365
 366         rx_ctl = asix_read_rx_ctl(dev);
 367         netdev_dbg(dev->net, "RX_CTL is 0x%04x after all initializations\n",
 368                    rx_ctl);
 369
 370         rx_ctl = asix_read_medium_status(dev);
 371         netdev_dbg(dev->net, "Medium Status is 0x%04x after all initializations\n",
 372                    rx_ctl);
 373
 374         /* Connect to PHY */
 375         snprintf(priv->phy_name, 20, PHY_ID_FMT,
 376                  priv->mdio->id, priv->phy_addr);
 377
 378         priv->phydev = phy_connect(dev->net, priv->phy_name,
 379                                    &ax88172a_adjust_link,
 380                                    PHY_INTERFACE_MODE_MII);
 381         if (IS_ERR(priv->phydev)) {
 382                 netdev_err(dev->net, "Could not connect to PHY device %s\n",
 383                            priv->phy_name);
 384                 ret = PTR_ERR(priv->phydev);
 385                 goto out;
 386         }
 387
 388         netdev_info(dev->net, "Connected to phy %s\n", priv->phy_name);
 389
 390         /* During power-up, the AX88172A set the power down (BMCR_PDOWN)
 391          * bit of the PHY. Bring the PHY up again.
 392          */
 393         genphy_resume(priv->phydev);
 394         phy_start(priv->phydev);
 395
 396         return 0;
 397
 398 out:
 399         return ret;
 400
 401 }
 402
 403 static int ax88172a_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
 404 {
 405         struct ax88172a_private *dp = dev->driver_priv;
 406         struct asix_rx_fixup_info *rx = &dp->rx_fixup_info;
 407
 408         return asix_rx_fixup_internal(dev, skb, rx);
 409 }
 410
 411 const struct driver_info ax88172a_info = {
 412         .description = "ASIX AX88172A USB 2.0 Ethernet",
 413         .bind = ax88172a_bind,
 414         .reset = ax88172a_reset,
 415         .stop = ax88172a_stop,
 416         .unbind = ax88172a_unbind,
 417         .status = ax88172a_status,
 418         .flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_LINK_INTR |
 419                  FLAG_MULTI_PACKET,
 420         .rx_fixup = ax88172a_rx_fixup,
 421         .tx_fixup = asix_tx_fixup,
 422 };