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_get_stats64        = usbnet_get_stats64,
 147         .ndo_set_mac_address    = asix_set_mac_address,
 148         .ndo_validate_addr      = eth_validate_addr,
 149         .ndo_do_ioctl           = ax88172a_ioctl,
 150         .ndo_set_rx_mode        = asix_set_multicast,
 151 };
 152
 153 static const struct ethtool_ops ax88172a_ethtool_ops = {
 154         .get_drvinfo            = asix_get_drvinfo,
 155         .get_link               = usbnet_get_link,
 156         .get_msglevel           = usbnet_get_msglevel,
 157         .set_msglevel           = usbnet_set_msglevel,
 158         .get_wol                = asix_get_wol,
 159         .set_wol                = asix_set_wol,
 160         .get_eeprom_len         = asix_get_eeprom_len,
 161         .get_eeprom             = asix_get_eeprom,
 162         .set_eeprom             = asix_set_eeprom,
 163         .nway_reset             = phy_ethtool_nway_reset,
 164         .get_link_ksettings     = phy_ethtool_get_link_ksettings,
 165         .set_link_ksettings     = phy_ethtool_set_link_ksettings,
 166 };
 167
 168 static int ax88172a_reset_phy(struct usbnet *dev, int embd_phy)
 169 {
 170         int ret;
 171
 172         ret = asix_sw_reset(dev, AX_SWRESET_IPPD, 0);
 173         if (ret < 0)
 174                 goto err;
 175
 176         msleep(150);
 177         ret = asix_sw_reset(dev, AX_SWRESET_CLEAR, 0);
 178         if (ret < 0)
 179                 goto err;
 180
 181         msleep(150);
 182
 183         ret = asix_sw_reset(dev, embd_phy ? AX_SWRESET_IPRL : AX_SWRESET_IPPD,
 184                             0);
 185         if (ret < 0)
 186                 goto err;
 187
 188         return 0;
 189
 190 err:
 191         return ret;
 192 }
 193
 194
 195 static int ax88172a_bind(struct usbnet *dev, struct usb_interface *intf)
 196 {
 197         int ret;
 198         u8 buf[ETH_ALEN];
 199         struct ax88172a_private *priv;
 200
 201         usbnet_get_endpoints(dev, intf);
 202
 203         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 204         if (!priv)
 205                 return -ENOMEM;
 206
 207         dev->driver_priv = priv;
 208
 209         /* Get the MAC address */
 210         ret = asix_read_cmd(dev, AX_CMD_READ_NODE_ID, 0, 0, ETH_ALEN, buf, 0);
 211         if (ret < 0) {
 212                 netdev_err(dev->net, "Failed to read MAC address: %d\n", ret);
 213                 goto free;
 214         }
 215         memcpy(dev->net->dev_addr, buf, ETH_ALEN);
 216
 217         dev->net->netdev_ops = &ax88172a_netdev_ops;
 218         dev->net->ethtool_ops = &ax88172a_ethtool_ops;
 219
 220         /* are we using the internal or the external phy? */
 221         ret = asix_read_cmd(dev, AX_CMD_SW_PHY_STATUS, 0, 0, 1, buf, 0);
 222         if (ret < 0) {
 223                 netdev_err(dev->net, "Failed to read software interface selection register: %d\n",
 224                            ret);
 225                 goto free;
 226         }
 227
 228         netdev_dbg(dev->net, "AX_CMD_SW_PHY_STATUS = 0x%02x\n", buf[0]);
 229         switch (buf[0] & AX_PHY_SELECT_MASK) {
 230         case AX_PHY_SELECT_INTERNAL:
 231                 netdev_dbg(dev->net, "use internal phy\n");
 232                 priv->use_embdphy = 1;
 233                 break;
 234         case AX_PHY_SELECT_EXTERNAL:
 235                 netdev_dbg(dev->net, "use external phy\n");
 236                 priv->use_embdphy = 0;
 237                 break;
 238         default:
 239                 netdev_err(dev->net, "Interface mode not supported by driver\n");
 240                 ret = -ENOTSUPP;
 241                 goto free;
 242         }
 243
 244         priv->phy_addr = asix_read_phy_addr(dev, priv->use_embdphy);
 245         ax88172a_reset_phy(dev, priv->use_embdphy);
 246
 247         /* Asix framing packs multiple eth frames into a 2K usb bulk transfer */
 248         if (dev->driver_info->flags & FLAG_FRAMING_AX) {
 249                 /* hard_mtu  is still the default - the device does not support
 250                    jumbo eth frames */
 251                 dev->rx_urb_size = 2048;
 252         }
 253
 254         /* init MDIO bus */
 255         ret = ax88172a_init_mdio(dev);
 256         if (ret)
 257                 goto free;
 258
 259         return 0;
 260
 261 free:
 262         kfree(priv);
 263         return ret;
 264 }
 265
 266 static int ax88172a_stop(struct usbnet *dev)
 267 {
 268         struct ax88172a_private *priv = dev->driver_priv;
 269
 270         netdev_dbg(dev->net, "Stopping interface\n");
 271
 272         if (priv->phydev) {
 273                 netdev_info(dev->net, "Disconnecting from phy %s\n",
 274                             priv->phy_name);
 275                 phy_stop(priv->phydev);
 276                 phy_disconnect(priv->phydev);
 277         }
 278
 279         return 0;
 280 }
 281
 282 static void ax88172a_unbind(struct usbnet *dev, struct usb_interface *intf)
 283 {
 284         struct ax88172a_private *priv = dev->driver_priv;
 285
 286         ax88172a_remove_mdio(dev);
 287         kfree(priv);
 288 }
 289
 290 static int ax88172a_reset(struct usbnet *dev)
 291 {
 292         struct asix_data *data = (struct asix_data *)&dev->data;
 293         struct ax88172a_private *priv = dev->driver_priv;
 294         int ret;
 295         u16 rx_ctl;
 296
 297         ax88172a_reset_phy(dev, priv->use_embdphy);
 298
 299         msleep(150);
 300         rx_ctl = asix_read_rx_ctl(dev, 0);
 301         netdev_dbg(dev->net, "RX_CTL is 0x%04x after software reset\n", rx_ctl);
 302         ret = asix_write_rx_ctl(dev, 0x0000, 0);
 303         if (ret < 0)
 304                 goto out;
 305
 306         rx_ctl = asix_read_rx_ctl(dev, 0);
 307         netdev_dbg(dev->net, "RX_CTL is 0x%04x setting to 0x0000\n", rx_ctl);
 308
 309         msleep(150);
 310
 311         ret = asix_write_cmd(dev, AX_CMD_WRITE_IPG0,
 312                              AX88772_IPG0_DEFAULT | AX88772_IPG1_DEFAULT,
 313                              AX88772_IPG2_DEFAULT, 0, NULL, 0);
 314         if (ret < 0) {
 315                 netdev_err(dev->net, "Write IPG,IPG1,IPG2 failed: %d\n", ret);
 316                 goto out;
 317         }
 318
 319         /* Rewrite MAC address */
 320         memcpy(data->mac_addr, dev->net->dev_addr, ETH_ALEN);
 321         ret = asix_write_cmd(dev, AX_CMD_WRITE_NODE_ID, 0, 0, ETH_ALEN,
 322                              data->mac_addr, 0);
 323         if (ret < 0)
 324                 goto out;
 325
 326         /* Set RX_CTL to default values with 2k buffer, and enable cactus */
 327         ret = asix_write_rx_ctl(dev, AX_DEFAULT_RX_CTL, 0);
 328         if (ret < 0)
 329                 goto out;
 330
 331         rx_ctl = asix_read_rx_ctl(dev, 0);
 332         netdev_dbg(dev->net, "RX_CTL is 0x%04x after all initializations\n",
 333                    rx_ctl);
 334
 335         rx_ctl = asix_read_medium_status(dev, 0);
 336         netdev_dbg(dev->net, "Medium Status is 0x%04x after all initializations\n",
 337                    rx_ctl);
 338
 339         /* Connect to PHY */
 340         snprintf(priv->phy_name, 20, PHY_ID_FMT,
 341                  priv->mdio->id, priv->phy_addr);
 342
 343         priv->phydev = phy_connect(dev->net, priv->phy_name,
 344                                    &ax88172a_adjust_link,
 345                                    PHY_INTERFACE_MODE_MII);
 346         if (IS_ERR(priv->phydev)) {
 347                 netdev_err(dev->net, "Could not connect to PHY device %s\n",
 348                            priv->phy_name);
 349                 ret = PTR_ERR(priv->phydev);
 350                 goto out;
 351         }
 352
 353         netdev_info(dev->net, "Connected to phy %s\n", priv->phy_name);
 354
 355         /* During power-up, the AX88172A set the power down (BMCR_PDOWN)
 356          * bit of the PHY. Bring the PHY up again.
 357          */
 358         genphy_resume(priv->phydev);
 359         phy_start(priv->phydev);
 360
 361         return 0;
 362
 363 out:
 364         return ret;
 365
 366 }
 367
 368 static int ax88172a_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
 369 {
 370         struct ax88172a_private *dp = dev->driver_priv;
 371         struct asix_rx_fixup_info *rx = &dp->rx_fixup_info;
 372
 373         return asix_rx_fixup_internal(dev, skb, rx);
 374 }
 375
 376 const struct driver_info ax88172a_info = {
 377         .description = "ASIX AX88172A USB 2.0 Ethernet",
 378         .bind = ax88172a_bind,
 379         .reset = ax88172a_reset,
 380         .stop = ax88172a_stop,
 381         .unbind = ax88172a_unbind,
 382         .status = ax88172a_status,
 383         .flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_LINK_INTR |
 384                  FLAG_MULTI_PACKET,
 385         .rx_fixup = ax88172a_rx_fixup,
 386         .tx_fixup = asix_tx_fixup,
 387 };