drivers/net/usb/smsc95xx.c

   1  /***************************************************************************
   2  *
   3  * Copyright (C) 2007-2008 SMSC
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18  *
  19  *****************************************************************************/
  20
  21 #include <linux/module.h>
  22 #include <linux/kmod.h>
  23 #include <linux/init.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/etherdevice.h>
  26 #include <linux/ethtool.h>
  27 #include <linux/mii.h>
  28 #include <linux/usb.h>
  29 #include <linux/crc32.h>
  30 #include <linux/usb/usbnet.h>
  31 #include <linux/slab.h>
  32 #include "smsc95xx.h"
  33
  34 #define SMSC_CHIPNAME                   "smsc95xx"
  35 #define SMSC_DRIVER_VERSION             "1.0.4"
  36 #define HS_USB_PKT_SIZE                 (512)
  37 #define FS_USB_PKT_SIZE                 (64)
  38 #define DEFAULT_HS_BURST_CAP_SIZE       (16 * 1024 + 5 * HS_USB_PKT_SIZE)
  39 #define DEFAULT_FS_BURST_CAP_SIZE       (6 * 1024 + 33 * FS_USB_PKT_SIZE)
  40 #define DEFAULT_BULK_IN_DELAY           (0x00002000)
  41 #define MAX_SINGLE_PACKET_SIZE          (2048)
  42 #define LAN95XX_EEPROM_MAGIC            (0x9500)
  43 #define EEPROM_MAC_OFFSET               (0x01)
  44 #define DEFAULT_TX_CSUM_ENABLE          (true)
  45 #define DEFAULT_RX_CSUM_ENABLE          (true)
  46 #define SMSC95XX_INTERNAL_PHY_ID        (1)
  47 #define SMSC95XX_TX_OVERHEAD            (8)
  48 #define SMSC95XX_TX_OVERHEAD_CSUM       (12)
  49
  50 struct smsc95xx_priv {
  51         u32 mac_cr;
  52         u32 hash_hi;
  53         u32 hash_lo;
  54         spinlock_t mac_cr_lock;
  55 };
  56
  57 struct usb_context {
  58         struct usb_ctrlrequest req;
  59         struct usbnet *dev;
  60 };
  61
  62 static bool turbo_mode = true;
  63 module_param(turbo_mode, bool, 0644);
  64 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
  65
  66 static int smsc95xx_read_reg(struct usbnet *dev, u32 index, u32 *data)
  67 {
  68         u32 *buf = kmalloc(4, GFP_KERNEL);
  69         int ret;
  70
  71         BUG_ON(!dev);
  72
  73         if (!buf)
  74                 return -ENOMEM;
  75
  76         ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
  77                 USB_VENDOR_REQUEST_READ_REGISTER,
  78                 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  79                 00, index, buf, 4, USB_CTRL_GET_TIMEOUT);
  80
  81         if (unlikely(ret < 0))
  82                 netdev_warn(dev->net, "Failed to read register index 0x%08x\n", index);
  83
  84         le32_to_cpus(buf);
  85         *data = *buf;
  86         kfree(buf);
  87
  88         return ret;
  89 }
  90
  91 static int smsc95xx_write_reg(struct usbnet *dev, u32 index, u32 data)
  92 {
  93         u32 *buf = kmalloc(4, GFP_KERNEL);
  94         int ret;
  95
  96         BUG_ON(!dev);
  97
  98         if (!buf)
  99                 return -ENOMEM;
 100
 101         *buf = data;
 102         cpu_to_le32s(buf);
 103
 104         ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
 105                 USB_VENDOR_REQUEST_WRITE_REGISTER,
 106                 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 107                 00, index, buf, 4, USB_CTRL_SET_TIMEOUT);
 108
 109         if (unlikely(ret < 0))
 110                 netdev_warn(dev->net, "Failed to write register index 0x%08x\n", index);
 111
 112         kfree(buf);
 113
 114         return ret;
 115 }
 116
 117 /* Loop until the read is completed with timeout
 118  * called with phy_mutex held */
 119 static int smsc95xx_phy_wait_not_busy(struct usbnet *dev)
 120 {
 121         unsigned long start_time = jiffies;
 122         u32 val;
 123
 124         do {
 125                 smsc95xx_read_reg(dev, MII_ADDR, &val);
 126                 if (!(val & MII_BUSY_))
 127                         return 0;
 128         } while (!time_after(jiffies, start_time + HZ));
 129
 130         return -EIO;
 131 }
 132
 133 static int smsc95xx_mdio_read(struct net_device *netdev, int phy_id, int idx)
 134 {
 135         struct usbnet *dev = netdev_priv(netdev);
 136         u32 val, addr;
 137
 138         mutex_lock(&dev->phy_mutex);
 139
 140         /* confirm MII not busy */
 141         if (smsc95xx_phy_wait_not_busy(dev)) {
 142                 netdev_warn(dev->net, "MII is busy in smsc95xx_mdio_read\n");
 143                 mutex_unlock(&dev->phy_mutex);
 144                 return -EIO;
 145         }
 146
 147         /* set the address, index & direction (read from PHY) */
 148         phy_id &= dev->mii.phy_id_mask;
 149         idx &= dev->mii.reg_num_mask;
 150         addr = (phy_id << 11) | (idx << 6) | MII_READ_;
 151         smsc95xx_write_reg(dev, MII_ADDR, addr);
 152
 153         if (smsc95xx_phy_wait_not_busy(dev)) {
 154                 netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
 155                 mutex_unlock(&dev->phy_mutex);
 156                 return -EIO;
 157         }
 158
 159         smsc95xx_read_reg(dev, MII_DATA, &val);
 160
 161         mutex_unlock(&dev->phy_mutex);
 162
 163         return (u16)(val & 0xFFFF);
 164 }
 165
 166 static void smsc95xx_mdio_write(struct net_device *netdev, int phy_id, int idx,
 167                                 int regval)
 168 {
 169         struct usbnet *dev = netdev_priv(netdev);
 170         u32 val, addr;
 171
 172         mutex_lock(&dev->phy_mutex);
 173
 174         /* confirm MII not busy */
 175         if (smsc95xx_phy_wait_not_busy(dev)) {
 176                 netdev_warn(dev->net, "MII is busy in smsc95xx_mdio_write\n");
 177                 mutex_unlock(&dev->phy_mutex);
 178                 return;
 179         }
 180
 181         val = regval;
 182         smsc95xx_write_reg(dev, MII_DATA, val);
 183
 184         /* set the address, index & direction (write to PHY) */
 185         phy_id &= dev->mii.phy_id_mask;
 186         idx &= dev->mii.reg_num_mask;
 187         addr = (phy_id << 11) | (idx << 6) | MII_WRITE_;
 188         smsc95xx_write_reg(dev, MII_ADDR, addr);
 189
 190         if (smsc95xx_phy_wait_not_busy(dev))
 191                 netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
 192
 193         mutex_unlock(&dev->phy_mutex);
 194 }
 195
 196 static int smsc95xx_wait_eeprom(struct usbnet *dev)
 197 {
 198         unsigned long start_time = jiffies;
 199         u32 val;
 200
 201         do {
 202                 smsc95xx_read_reg(dev, E2P_CMD, &val);
 203                 if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
 204                         break;
 205                 udelay(40);
 206         } while (!time_after(jiffies, start_time + HZ));
 207
 208         if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
 209                 netdev_warn(dev->net, "EEPROM read operation timeout\n");
 210                 return -EIO;
 211         }
 212
 213         return 0;
 214 }
 215
 216 static int smsc95xx_eeprom_confirm_not_busy(struct usbnet *dev)
 217 {
 218         unsigned long start_time = jiffies;
 219         u32 val;
 220
 221         do {
 222                 smsc95xx_read_reg(dev, E2P_CMD, &val);
 223
 224                 if (!(val & E2P_CMD_BUSY_))
 225                         return 0;
 226
 227                 udelay(40);
 228         } while (!time_after(jiffies, start_time + HZ));
 229
 230         netdev_warn(dev->net, "EEPROM is busy\n");
 231         return -EIO;
 232 }
 233
 234 static int smsc95xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
 235                                 u8 *data)
 236 {
 237         u32 val;
 238         int i, ret;
 239
 240         BUG_ON(!dev);
 241         BUG_ON(!data);
 242
 243         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 244         if (ret)
 245                 return ret;
 246
 247         for (i = 0; i < length; i++) {
 248                 val = E2P_CMD_BUSY_ | E2P_CMD_READ_ | (offset & E2P_CMD_ADDR_);
 249                 smsc95xx_write_reg(dev, E2P_CMD, val);
 250
 251                 ret = smsc95xx_wait_eeprom(dev);
 252                 if (ret < 0)
 253                         return ret;
 254
 255                 smsc95xx_read_reg(dev, E2P_DATA, &val);
 256
 257                 data[i] = val & 0xFF;
 258                 offset++;
 259         }
 260
 261         return 0;
 262 }
 263
 264 static int smsc95xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
 265                                  u8 *data)
 266 {
 267         u32 val;
 268         int i, ret;
 269
 270         BUG_ON(!dev);
 271         BUG_ON(!data);
 272
 273         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 274         if (ret)
 275                 return ret;
 276
 277         /* Issue write/erase enable command */
 278         val = E2P_CMD_BUSY_ | E2P_CMD_EWEN_;
 279         smsc95xx_write_reg(dev, E2P_CMD, val);
 280
 281         ret = smsc95xx_wait_eeprom(dev);
 282         if (ret < 0)
 283                 return ret;
 284
 285         for (i = 0; i < length; i++) {
 286
 287                 /* Fill data register */
 288                 val = data[i];
 289                 smsc95xx_write_reg(dev, E2P_DATA, val);
 290
 291                 /* Send "write" command */
 292                 val = E2P_CMD_BUSY_ | E2P_CMD_WRITE_ | (offset & E2P_CMD_ADDR_);
 293                 smsc95xx_write_reg(dev, E2P_CMD, val);
 294
 295                 ret = smsc95xx_wait_eeprom(dev);
 296                 if (ret < 0)
 297                         return ret;
 298
 299                 offset++;
 300         }
 301
 302         return 0;
 303 }
 304
 305 static void smsc95xx_async_cmd_callback(struct urb *urb)
 306 {
 307         struct usb_context *usb_context = urb->context;
 308         struct usbnet *dev = usb_context->dev;
 309         int status = urb->status;
 310
 311         if (status < 0)
 312                 netdev_warn(dev->net, "async callback failed with %d\n", status);
 313
 314         kfree(usb_context);
 315         usb_free_urb(urb);
 316 }
 317
 318 static int smsc95xx_write_reg_async(struct usbnet *dev, u16 index, u32 *data)
 319 {
 320         struct usb_context *usb_context;
 321         int status;
 322         struct urb *urb;
 323         const u16 size = 4;
 324
 325         urb = usb_alloc_urb(0, GFP_ATOMIC);
 326         if (!urb) {
 327                 netdev_warn(dev->net, "Error allocating URB\n");
 328                 return -ENOMEM;
 329         }
 330
 331         usb_context = kmalloc(sizeof(struct usb_context), GFP_ATOMIC);
 332         if (usb_context == NULL) {
 333                 netdev_warn(dev->net, "Error allocating control msg\n");
 334                 usb_free_urb(urb);
 335                 return -ENOMEM;
 336         }
 337
 338         usb_context->req.bRequestType =
 339                 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE;
 340         usb_context->req.bRequest = USB_VENDOR_REQUEST_WRITE_REGISTER;
 341         usb_context->req.wValue = 00;
 342         usb_context->req.wIndex = cpu_to_le16(index);
 343         usb_context->req.wLength = cpu_to_le16(size);
 344
 345         usb_fill_control_urb(urb, dev->udev, usb_sndctrlpipe(dev->udev, 0),
 346                 (void *)&usb_context->req, data, size,
 347                 smsc95xx_async_cmd_callback,
 348                 (void *)usb_context);
 349
 350         status = usb_submit_urb(urb, GFP_ATOMIC);
 351         if (status < 0) {
 352                 netdev_warn(dev->net, "Error submitting control msg, sts=%d\n",
 353                             status);
 354                 kfree(usb_context);
 355                 usb_free_urb(urb);
 356         }
 357
 358         return status;
 359 }
 360
 361 /* returns hash bit number for given MAC address
 362  * example:
 363  * 01 00 5E 00 00 01 -> returns bit number 31 */
 364 static unsigned int smsc95xx_hash(char addr[ETH_ALEN])
 365 {
 366         return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
 367 }
 368
 369 static void smsc95xx_set_multicast(struct net_device *netdev)
 370 {
 371         struct usbnet *dev = netdev_priv(netdev);
 372         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 373         unsigned long flags;
 374
 375         pdata->hash_hi = 0;
 376         pdata->hash_lo = 0;
 377
 378         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 379
 380         if (dev->net->flags & IFF_PROMISC) {
 381                 netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
 382                 pdata->mac_cr |= MAC_CR_PRMS_;
 383                 pdata->mac_cr &= ~(MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 384         } else if (dev->net->flags & IFF_ALLMULTI) {
 385                 netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
 386                 pdata->mac_cr |= MAC_CR_MCPAS_;
 387                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_HPFILT_);
 388         } else if (!netdev_mc_empty(dev->net)) {
 389                 struct netdev_hw_addr *ha;
 390
 391                 pdata->mac_cr |= MAC_CR_HPFILT_;
 392                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);
 393
 394                 netdev_for_each_mc_addr(ha, netdev) {
 395                         u32 bitnum = smsc95xx_hash(ha->addr);
 396                         u32 mask = 0x01 << (bitnum & 0x1F);
 397                         if (bitnum & 0x20)
 398                                 pdata->hash_hi |= mask;
 399                         else
 400                                 pdata->hash_lo |= mask;
 401                 }
 402
 403                 netif_dbg(dev, drv, dev->net, "HASHH=0x%08X, HASHL=0x%08X\n",
 404                                    pdata->hash_hi, pdata->hash_lo);
 405         } else {
 406                 netif_dbg(dev, drv, dev->net, "receive own packets only\n");
 407                 pdata->mac_cr &=
 408                         ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 409         }
 410
 411         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 412
 413         /* Initiate async writes, as we can't wait for completion here */
 414         smsc95xx_write_reg_async(dev, HASHH, &pdata->hash_hi);
 415         smsc95xx_write_reg_async(dev, HASHL, &pdata->hash_lo);
 416         smsc95xx_write_reg_async(dev, MAC_CR, &pdata->mac_cr);
 417 }
 418
 419 static void smsc95xx_phy_update_flowcontrol(struct usbnet *dev, u8 duplex,
 420                                             u16 lcladv, u16 rmtadv)
 421 {
 422         u32 flow, afc_cfg = 0;
 423
 424         int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
 425         if (ret < 0) {
 426                 netdev_warn(dev->net, "error reading AFC_CFG\n");
 427                 return;
 428         }
 429
 430         if (duplex == DUPLEX_FULL) {
 431                 u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
 432
 433                 if (cap & FLOW_CTRL_RX)
 434                         flow = 0xFFFF0002;
 435                 else
 436                         flow = 0;
 437
 438                 if (cap & FLOW_CTRL_TX)
 439                         afc_cfg |= 0xF;
 440                 else
 441                         afc_cfg &= ~0xF;
 442
 443                 netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
 444                                    cap & FLOW_CTRL_RX ? "enabled" : "disabled",
 445                                    cap & FLOW_CTRL_TX ? "enabled" : "disabled");
 446         } else {
 447                 netif_dbg(dev, link, dev->net, "half duplex\n");
 448                 flow = 0;
 449                 afc_cfg |= 0xF;
 450         }
 451
 452         smsc95xx_write_reg(dev, FLOW, flow);
 453         smsc95xx_write_reg(dev, AFC_CFG, afc_cfg);
 454 }
 455
 456 static int smsc95xx_link_reset(struct usbnet *dev)
 457 {
 458         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 459         struct mii_if_info *mii = &dev->mii;
 460         struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
 461         unsigned long flags;
 462         u16 lcladv, rmtadv;
 463         u32 intdata;
 464
 465         /* clear interrupt status */
 466         smsc95xx_mdio_read(dev->net, mii->phy_id, PHY_INT_SRC);
 467         intdata = 0xFFFFFFFF;
 468         smsc95xx_write_reg(dev, INT_STS, intdata);
 469
 470         mii_check_media(mii, 1, 1);
 471         mii_ethtool_gset(&dev->mii, &ecmd);
 472         lcladv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_ADVERTISE);
 473         rmtadv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_LPA);
 474
 475         netif_dbg(dev, link, dev->net,
 476                   "speed: %u duplex: %d lcladv: %04x rmtadv: %04x\n",
 477                   ethtool_cmd_speed(&ecmd), ecmd.duplex, lcladv, rmtadv);
 478
 479         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 480         if (ecmd.duplex != DUPLEX_FULL) {
 481                 pdata->mac_cr &= ~MAC_CR_FDPX_;
 482                 pdata->mac_cr |= MAC_CR_RCVOWN_;
 483         } else {
 484                 pdata->mac_cr &= ~MAC_CR_RCVOWN_;
 485                 pdata->mac_cr |= MAC_CR_FDPX_;
 486         }
 487         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 488
 489         smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 490
 491         smsc95xx_phy_update_flowcontrol(dev, ecmd.duplex, lcladv, rmtadv);
 492
 493         return 0;
 494 }
 495
 496 static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
 497 {
 498         u32 intdata;
 499
 500         if (urb->actual_length != 4) {
 501                 netdev_warn(dev->net, "unexpected urb length %d\n",
 502                             urb->actual_length);
 503                 return;
 504         }
 505
 506         memcpy(&intdata, urb->transfer_buffer, 4);
 507         le32_to_cpus(&intdata);
 508
 509         netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
 510
 511         if (intdata & INT_ENP_PHY_INT_)
 512                 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
 513         else
 514                 netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
 515                             intdata);
 516 }
 517
 518 /* Enable or disable Tx & Rx checksum offload engines */
 519 static int smsc95xx_set_features(struct net_device *netdev,
 520         netdev_features_t features)
 521 {
 522         struct usbnet *dev = netdev_priv(netdev);
 523         u32 read_buf;
 524         int ret;
 525
 526         ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
 527         if (ret < 0) {
 528                 netdev_warn(dev->net, "Failed to read COE_CR: %d\n", ret);
 529                 return ret;
 530         }
 531
 532         if (features & NETIF_F_HW_CSUM)
 533                 read_buf |= Tx_COE_EN_;
 534         else
 535                 read_buf &= ~Tx_COE_EN_;
 536
 537         if (features & NETIF_F_RXCSUM)
 538                 read_buf |= Rx_COE_EN_;
 539         else
 540                 read_buf &= ~Rx_COE_EN_;
 541
 542         ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
 543         if (ret < 0) {
 544                 netdev_warn(dev->net, "Failed to write COE_CR: %d\n", ret);
 545                 return ret;
 546         }
 547
 548         netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
 549         return 0;
 550 }
 551
 552 static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
 553 {
 554         return MAX_EEPROM_SIZE;
 555 }
 556
 557 static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
 558                                        struct ethtool_eeprom *ee, u8 *data)
 559 {
 560         struct usbnet *dev = netdev_priv(netdev);
 561
 562         ee->magic = LAN95XX_EEPROM_MAGIC;
 563
 564         return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
 565 }
 566
 567 static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
 568                                        struct ethtool_eeprom *ee, u8 *data)
 569 {
 570         struct usbnet *dev = netdev_priv(netdev);
 571
 572         if (ee->magic != LAN95XX_EEPROM_MAGIC) {
 573                 netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
 574                             ee->magic);
 575                 return -EINVAL;
 576         }
 577
 578         return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
 579 }
 580
 581 static int smsc95xx_ethtool_getregslen(struct net_device *netdev)
 582 {
 583         /* all smsc95xx registers */
 584         return COE_CR - ID_REV + 1;
 585 }
 586
 587 static void
 588 smsc95xx_ethtool_getregs(struct net_device *netdev, struct ethtool_regs *regs,
 589                          void *buf)
 590 {
 591         struct usbnet *dev = netdev_priv(netdev);
 592         unsigned int i, j;
 593         int retval;
 594         u32 *data = buf;
 595
 596         retval = smsc95xx_read_reg(dev, ID_REV, &regs->version);
 597         if (retval < 0) {
 598                 netdev_warn(netdev, "REGS: cannot read ID_REV\n");
 599                 return;
 600         }
 601
 602         for (i = ID_REV, j = 0; i <= COE_CR; i += (sizeof(u32)), j++) {
 603                 retval = smsc95xx_read_reg(dev, i, &data[j]);
 604                 if (retval < 0) {
 605                         netdev_warn(netdev, "REGS: cannot read reg[%x]\n", i);
 606                         return;
 607                 }
 608         }
 609 }
 610
 611 static const struct ethtool_ops smsc95xx_ethtool_ops = {
 612         .get_link       = usbnet_get_link,
 613         .nway_reset     = usbnet_nway_reset,
 614         .get_drvinfo    = usbnet_get_drvinfo,
 615         .get_msglevel   = usbnet_get_msglevel,
 616         .set_msglevel   = usbnet_set_msglevel,
 617         .get_settings   = usbnet_get_settings,
 618         .set_settings   = usbnet_set_settings,
 619         .get_eeprom_len = smsc95xx_ethtool_get_eeprom_len,
 620         .get_eeprom     = smsc95xx_ethtool_get_eeprom,
 621         .set_eeprom     = smsc95xx_ethtool_set_eeprom,
 622         .get_regs_len   = smsc95xx_ethtool_getregslen,
 623         .get_regs       = smsc95xx_ethtool_getregs,
 624 };
 625
 626 static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
 627 {
 628         struct usbnet *dev = netdev_priv(netdev);
 629
 630         if (!netif_running(netdev))
 631                 return -EINVAL;
 632
 633         return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
 634 }
 635
 636 static void smsc95xx_init_mac_address(struct usbnet *dev)
 637 {
 638         /* try reading mac address from EEPROM */
 639         if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
 640                         dev->net->dev_addr) == 0) {
 641                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 642                         /* eeprom values are valid so use them */
 643                         netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
 644                         return;
 645                 }
 646         }
 647
 648         /* no eeprom, or eeprom values are invalid. generate random MAC */
 649         eth_hw_addr_random(dev->net);
 650         netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
 651 }
 652
 653 static int smsc95xx_set_mac_address(struct usbnet *dev)
 654 {
 655         u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
 656                 dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
 657         u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
 658         int ret;
 659
 660         ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
 661         if (ret < 0) {
 662                 netdev_warn(dev->net, "Failed to write ADDRL: %d\n", ret);
 663                 return ret;
 664         }
 665
 666         ret = smsc95xx_write_reg(dev, ADDRH, addr_hi);
 667         if (ret < 0) {
 668                 netdev_warn(dev->net, "Failed to write ADDRH: %d\n", ret);
 669                 return ret;
 670         }
 671
 672         return 0;
 673 }
 674
 675 /* starts the TX path */
 676 static void smsc95xx_start_tx_path(struct usbnet *dev)
 677 {
 678         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 679         unsigned long flags;
 680         u32 reg_val;
 681
 682         /* Enable Tx at MAC */
 683         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 684         pdata->mac_cr |= MAC_CR_TXEN_;
 685         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 686
 687         smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 688
 689         /* Enable Tx at SCSRs */
 690         reg_val = TX_CFG_ON_;
 691         smsc95xx_write_reg(dev, TX_CFG, reg_val);
 692 }
 693
 694 /* Starts the Receive path */
 695 static void smsc95xx_start_rx_path(struct usbnet *dev)
 696 {
 697         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 698         unsigned long flags;
 699
 700         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 701         pdata->mac_cr |= MAC_CR_RXEN_;
 702         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 703
 704         smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 705 }
 706
 707 static int smsc95xx_phy_initialize(struct usbnet *dev)
 708 {
 709         int bmcr, timeout = 0;
 710
 711         /* Initialize MII structure */
 712         dev->mii.dev = dev->net;
 713         dev->mii.mdio_read = smsc95xx_mdio_read;
 714         dev->mii.mdio_write = smsc95xx_mdio_write;
 715         dev->mii.phy_id_mask = 0x1f;
 716         dev->mii.reg_num_mask = 0x1f;
 717         dev->mii.phy_id = SMSC95XX_INTERNAL_PHY_ID;
 718
 719         /* reset phy and wait for reset to complete */
 720         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR, BMCR_RESET);
 721
 722         do {
 723                 msleep(10);
 724                 bmcr = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, MII_BMCR);
 725                 timeout++;
 726         } while ((bmcr & BMCR_RESET) && (timeout < 100));
 727
 728         if (timeout >= 100) {
 729                 netdev_warn(dev->net, "timeout on PHY Reset");
 730                 return -EIO;
 731         }
 732
 733         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_ADVERTISE,
 734                 ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP |
 735                 ADVERTISE_PAUSE_ASYM);
 736
 737         /* read to clear */
 738         smsc95xx_mdio_read(dev->net, dev->mii.phy_id, PHY_INT_SRC);
 739
 740         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, PHY_INT_MASK,
 741                 PHY_INT_MASK_DEFAULT_);
 742         mii_nway_restart(&dev->mii);
 743
 744         netif_dbg(dev, ifup, dev->net, "phy initialised successfully\n");
 745         return 0;
 746 }
 747
 748 static int smsc95xx_reset(struct usbnet *dev)
 749 {
 750         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 751         u32 read_buf, write_buf, burst_cap;
 752         int ret = 0, timeout;
 753
 754         netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
 755
 756         write_buf = HW_CFG_LRST_;
 757         ret = smsc95xx_write_reg(dev, HW_CFG, write_buf);
 758         if (ret < 0) {
 759                 netdev_warn(dev->net, "Failed to write HW_CFG_LRST_ bit in HW_CFG register, ret = %d\n",
 760                             ret);
 761                 return ret;
 762         }
 763
 764         timeout = 0;
 765         do {
 766                 msleep(10);
 767                 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 768                 if (ret < 0) {
 769                         netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
 770                         return ret;
 771                 }
 772                 timeout++;
 773         } while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
 774
 775         if (timeout >= 100) {
 776                 netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
 777                 return ret;
 778         }
 779
 780         write_buf = PM_CTL_PHY_RST_;
 781         ret = smsc95xx_write_reg(dev, PM_CTRL, write_buf);
 782         if (ret < 0) {
 783                 netdev_warn(dev->net, "Failed to write PM_CTRL: %d\n", ret);
 784                 return ret;
 785         }
 786
 787         timeout = 0;
 788         do {
 789                 msleep(10);
 790                 ret = smsc95xx_read_reg(dev, PM_CTRL, &read_buf);
 791                 if (ret < 0) {
 792                         netdev_warn(dev->net, "Failed to read PM_CTRL: %d\n", ret);
 793                         return ret;
 794                 }
 795                 timeout++;
 796         } while ((read_buf & PM_CTL_PHY_RST_) && (timeout < 100));
 797
 798         if (timeout >= 100) {
 799                 netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
 800                 return ret;
 801         }
 802
 803         ret = smsc95xx_set_mac_address(dev);
 804         if (ret < 0)
 805                 return ret;
 806
 807         netif_dbg(dev, ifup, dev->net,
 808                   "MAC Address: %pM\n", dev->net->dev_addr);
 809
 810         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 811         if (ret < 0) {
 812                 netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
 813                 return ret;
 814         }
 815
 816         netif_dbg(dev, ifup, dev->net,
 817                   "Read Value from HW_CFG : 0x%08x\n", read_buf);
 818
 819         read_buf |= HW_CFG_BIR_;
 820
 821         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 822         if (ret < 0) {
 823                 netdev_warn(dev->net, "Failed to write HW_CFG_BIR_ bit in HW_CFG register, ret = %d\n",
 824                             ret);
 825                 return ret;
 826         }
 827
 828         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 829         if (ret < 0) {
 830                 netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
 831                 return ret;
 832         }
 833         netif_dbg(dev, ifup, dev->net,
 834                   "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
 835                   read_buf);
 836
 837         if (!turbo_mode) {
 838                 burst_cap = 0;
 839                 dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
 840         } else if (dev->udev->speed == USB_SPEED_HIGH) {
 841                 burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
 842                 dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
 843         } else {
 844                 burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
 845                 dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
 846         }
 847
 848         netif_dbg(dev, ifup, dev->net,
 849                   "rx_urb_size=%ld\n", (ulong)dev->rx_urb_size);
 850
 851         ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
 852         if (ret < 0) {
 853                 netdev_warn(dev->net, "Failed to write BURST_CAP: %d\n", ret);
 854                 return ret;
 855         }
 856
 857         ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
 858         if (ret < 0) {
 859                 netdev_warn(dev->net, "Failed to read BURST_CAP: %d\n", ret);
 860                 return ret;
 861         }
 862         netif_dbg(dev, ifup, dev->net,
 863                   "Read Value from BURST_CAP after writing: 0x%08x\n",
 864                   read_buf);
 865
 866         read_buf = DEFAULT_BULK_IN_DELAY;
 867         ret = smsc95xx_write_reg(dev, BULK_IN_DLY, read_buf);
 868         if (ret < 0) {
 869                 netdev_warn(dev->net, "ret = %d\n", ret);
 870                 return ret;
 871         }
 872
 873         ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
 874         if (ret < 0) {
 875                 netdev_warn(dev->net, "Failed to read BULK_IN_DLY: %d\n", ret);
 876                 return ret;
 877         }
 878         netif_dbg(dev, ifup, dev->net,
 879                   "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
 880                   read_buf);
 881
 882         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 883         if (ret < 0) {
 884                 netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
 885                 return ret;
 886         }
 887         netif_dbg(dev, ifup, dev->net,
 888                   "Read Value from HW_CFG: 0x%08x\n", read_buf);
 889
 890         if (turbo_mode)
 891                 read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
 892
 893         read_buf &= ~HW_CFG_RXDOFF_;
 894
 895         /* set Rx data offset=2, Make IP header aligns on word boundary. */
 896         read_buf |= NET_IP_ALIGN << 9;
 897
 898         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 899         if (ret < 0) {
 900                 netdev_warn(dev->net, "Failed to write HW_CFG register, ret=%d\n",
 901                             ret);
 902                 return ret;
 903         }
 904
 905         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 906         if (ret < 0) {
 907                 netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
 908                 return ret;
 909         }
 910         netif_dbg(dev, ifup, dev->net,
 911                   "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
 912
 913         write_buf = 0xFFFFFFFF;
 914         ret = smsc95xx_write_reg(dev, INT_STS, write_buf);
 915         if (ret < 0) {
 916                 netdev_warn(dev->net, "Failed to write INT_STS register, ret=%d\n",
 917                             ret);
 918                 return ret;
 919         }
 920
 921         ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
 922         if (ret < 0) {
 923                 netdev_warn(dev->net, "Failed to read ID_REV: %d\n", ret);
 924                 return ret;
 925         }
 926         netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
 927
 928         /* Configure GPIO pins as LED outputs */
 929         write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
 930                 LED_GPIO_CFG_FDX_LED;
 931         ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
 932         if (ret < 0) {
 933                 netdev_warn(dev->net, "Failed to write LED_GPIO_CFG register, ret=%d\n",
 934                             ret);
 935                 return ret;
 936         }
 937
 938         /* Init Tx */
 939         write_buf = 0;
 940         ret = smsc95xx_write_reg(dev, FLOW, write_buf);
 941         if (ret < 0) {
 942                 netdev_warn(dev->net, "Failed to write FLOW: %d\n", ret);
 943                 return ret;
 944         }
 945
 946         read_buf = AFC_CFG_DEFAULT;
 947         ret = smsc95xx_write_reg(dev, AFC_CFG, read_buf);
 948         if (ret < 0) {
 949                 netdev_warn(dev->net, "Failed to write AFC_CFG: %d\n", ret);
 950                 return ret;
 951         }
 952
 953         /* Don't need mac_cr_lock during initialisation */
 954         ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
 955         if (ret < 0) {
 956                 netdev_warn(dev->net, "Failed to read MAC_CR: %d\n", ret);
 957                 return ret;
 958         }
 959
 960         /* Init Rx */
 961         /* Set Vlan */
 962         write_buf = (u32)ETH_P_8021Q;
 963         ret = smsc95xx_write_reg(dev, VLAN1, write_buf);
 964         if (ret < 0) {
 965                 netdev_warn(dev->net, "Failed to write VAN1: %d\n", ret);
 966                 return ret;
 967         }
 968
 969         /* Enable or disable checksum offload engines */
 970         smsc95xx_set_features(dev->net, dev->net->features);
 971
 972         smsc95xx_set_multicast(dev->net);
 973
 974         if (smsc95xx_phy_initialize(dev) < 0)
 975                 return -EIO;
 976
 977         ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
 978         if (ret < 0) {
 979                 netdev_warn(dev->net, "Failed to read INT_EP_CTL: %d\n", ret);
 980                 return ret;
 981         }
 982
 983         /* enable PHY interrupts */
 984         read_buf |= INT_EP_CTL_PHY_INT_;
 985
 986         ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
 987         if (ret < 0) {
 988                 netdev_warn(dev->net, "Failed to write INT_EP_CTL: %d\n", ret);
 989                 return ret;
 990         }
 991
 992         smsc95xx_start_tx_path(dev);
 993         smsc95xx_start_rx_path(dev);
 994
 995         netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
 996         return 0;
 997 }
 998
 999 static const struct net_device_ops smsc95xx_netdev_ops = {
1000         .ndo_open               = usbnet_open,
1001         .ndo_stop               = usbnet_stop,
1002         .ndo_start_xmit         = usbnet_start_xmit,
1003         .ndo_tx_timeout         = usbnet_tx_timeout,
1004         .ndo_change_mtu         = usbnet_change_mtu,
1005         .ndo_set_mac_address    = eth_mac_addr,
1006         .ndo_validate_addr      = eth_validate_addr,
1007         .ndo_do_ioctl           = smsc95xx_ioctl,
1008         .ndo_set_rx_mode        = smsc95xx_set_multicast,
1009         .ndo_set_features       = smsc95xx_set_features,
1010 };
1011
1012 static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1013 {
1014         struct smsc95xx_priv *pdata = NULL;
1015         int ret;
1016
1017         printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1018
1019         ret = usbnet_get_endpoints(dev, intf);
1020         if (ret < 0) {
1021                 netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1022                 return ret;
1023         }
1024
1025         dev->data[0] = (unsigned long)kzalloc(sizeof(struct smsc95xx_priv),
1026                 GFP_KERNEL);
1027
1028         pdata = (struct smsc95xx_priv *)(dev->data[0]);
1029         if (!pdata) {
1030                 netdev_warn(dev->net, "Unable to allocate struct smsc95xx_priv\n");
1031                 return -ENOMEM;
1032         }
1033
1034         spin_lock_init(&pdata->mac_cr_lock);
1035
1036         if (DEFAULT_TX_CSUM_ENABLE)
1037                 dev->net->features |= NETIF_F_HW_CSUM;
1038         if (DEFAULT_RX_CSUM_ENABLE)
1039                 dev->net->features |= NETIF_F_RXCSUM;
1040
1041         dev->net->hw_features = NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1042
1043         smsc95xx_init_mac_address(dev);
1044
1045         /* Init all registers */
1046         ret = smsc95xx_reset(dev);
1047
1048         dev->net->netdev_ops = &smsc95xx_netdev_ops;
1049         dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1050         dev->net->flags |= IFF_MULTICAST;
1051         dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
1052         dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
1053         return 0;
1054 }
1055
1056 static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1057 {
1058         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1059         if (pdata) {
1060                 netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1061                 kfree(pdata);
1062                 pdata = NULL;
1063                 dev->data[0] = 0;
1064         }
1065 }
1066
1067 static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1068 {
1069         skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
1070         skb->ip_summed = CHECKSUM_COMPLETE;
1071         skb_trim(skb, skb->len - 2);
1072 }
1073
1074 static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1075 {
1076         while (skb->len > 0) {
1077                 u32 header, align_count;
1078                 struct sk_buff *ax_skb;
1079                 unsigned char *packet;
1080                 u16 size;
1081
1082                 memcpy(&header, skb->data, sizeof(header));
1083                 le32_to_cpus(&header);
1084                 skb_pull(skb, 4 + NET_IP_ALIGN);
1085                 packet = skb->data;
1086
1087                 /* get the packet length */
1088                 size = (u16)((header & RX_STS_FL_) >> 16);
1089                 align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1090
1091                 if (unlikely(header & RX_STS_ES_)) {
1092                         netif_dbg(dev, rx_err, dev->net,
1093                                   "Error header=0x%08x\n", header);
1094                         dev->net->stats.rx_errors++;
1095                         dev->net->stats.rx_dropped++;
1096
1097                         if (header & RX_STS_CRC_) {
1098                                 dev->net->stats.rx_crc_errors++;
1099                         } else {
1100                                 if (header & (RX_STS_TL_ | RX_STS_RF_))
1101                                         dev->net->stats.rx_frame_errors++;
1102
1103                                 if ((header & RX_STS_LE_) &&
1104                                         (!(header & RX_STS_FT_)))
1105                                         dev->net->stats.rx_length_errors++;
1106                         }
1107                 } else {
1108                         /* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1109                         if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1110                                 netif_dbg(dev, rx_err, dev->net,
1111                                           "size err header=0x%08x\n", header);
1112                                 return 0;
1113                         }
1114
1115                         /* last frame in this batch */
1116                         if (skb->len == size) {
1117                                 if (dev->net->features & NETIF_F_RXCSUM)
1118                                         smsc95xx_rx_csum_offload(skb);
1119                                 skb_trim(skb, skb->len - 4); /* remove fcs */
1120                                 skb->truesize = size + sizeof(struct sk_buff);
1121
1122                                 return 1;
1123                         }
1124
1125                         ax_skb = skb_clone(skb, GFP_ATOMIC);
1126                         if (unlikely(!ax_skb)) {
1127                                 netdev_warn(dev->net, "Error allocating skb\n");
1128                                 return 0;
1129                         }
1130
1131                         ax_skb->len = size;
1132                         ax_skb->data = packet;
1133                         skb_set_tail_pointer(ax_skb, size);
1134
1135                         if (dev->net->features & NETIF_F_RXCSUM)
1136                                 smsc95xx_rx_csum_offload(ax_skb);
1137                         skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1138                         ax_skb->truesize = size + sizeof(struct sk_buff);
1139
1140                         usbnet_skb_return(dev, ax_skb);
1141                 }
1142
1143                 skb_pull(skb, size);
1144
1145                 /* padding bytes before the next frame starts */
1146                 if (skb->len)
1147                         skb_pull(skb, align_count);
1148         }
1149
1150         if (unlikely(skb->len < 0)) {
1151                 netdev_warn(dev->net, "invalid rx length<0 %d\n", skb->len);
1152                 return 0;
1153         }
1154
1155         return 1;
1156 }
1157
1158 static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1159 {
1160         u16 low_16 = (u16)skb_checksum_start_offset(skb);
1161         u16 high_16 = low_16 + skb->csum_offset;
1162         return (high_16 << 16) | low_16;
1163 }
1164
1165 static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1166                                          struct sk_buff *skb, gfp_t flags)
1167 {
1168         bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
1169         int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
1170         u32 tx_cmd_a, tx_cmd_b;
1171
1172         /* We do not advertise SG, so skbs should be already linearized */
1173         BUG_ON(skb_shinfo(skb)->nr_frags);
1174
1175         if (skb_headroom(skb) < overhead) {
1176                 struct sk_buff *skb2 = skb_copy_expand(skb,
1177                         overhead, 0, flags);
1178                 dev_kfree_skb_any(skb);
1179                 skb = skb2;
1180                 if (!skb)
1181                         return NULL;
1182         }
1183
1184         if (csum) {
1185                 if (skb->len <= 45) {
1186                         /* workaround - hardware tx checksum does not work
1187                          * properly with extremely small packets */
1188                         long csstart = skb_checksum_start_offset(skb);
1189                         __wsum calc = csum_partial(skb->data + csstart,
1190                                 skb->len - csstart, 0);
1191                         *((__sum16 *)(skb->data + csstart
1192                                 + skb->csum_offset)) = csum_fold(calc);
1193
1194                         csum = false;
1195                 } else {
1196                         u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
1197                         skb_push(skb, 4);
1198                         memcpy(skb->data, &csum_preamble, 4);
1199                 }
1200         }
1201
1202         skb_push(skb, 4);
1203         tx_cmd_b = (u32)(skb->len - 4);
1204         if (csum)
1205                 tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
1206         cpu_to_le32s(&tx_cmd_b);
1207         memcpy(skb->data, &tx_cmd_b, 4);
1208
1209         skb_push(skb, 4);
1210         tx_cmd_a = (u32)(skb->len - 8) | TX_CMD_A_FIRST_SEG_ |
1211                 TX_CMD_A_LAST_SEG_;
1212         cpu_to_le32s(&tx_cmd_a);
1213         memcpy(skb->data, &tx_cmd_a, 4);
1214
1215         return skb;
1216 }
1217
1218 static const struct driver_info smsc95xx_info = {
1219         .description    = "smsc95xx USB 2.0 Ethernet",
1220         .bind           = smsc95xx_bind,
1221         .unbind         = smsc95xx_unbind,
1222         .link_reset     = smsc95xx_link_reset,
1223         .reset          = smsc95xx_reset,
1224         .rx_fixup       = smsc95xx_rx_fixup,
1225         .tx_fixup       = smsc95xx_tx_fixup,
1226         .status         = smsc95xx_status,
1227         .flags          = FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
1228 };
1229
1230 static const struct usb_device_id products[] = {
1231         {
1232                 /* SMSC9500 USB Ethernet Device */
1233                 USB_DEVICE(0x0424, 0x9500),
1234                 .driver_info = (unsigned long) &smsc95xx_info,
1235         },
1236         {
1237                 /* SMSC9505 USB Ethernet Device */
1238                 USB_DEVICE(0x0424, 0x9505),
1239                 .driver_info = (unsigned long) &smsc95xx_info,
1240         },
1241         {
1242                 /* SMSC9500A USB Ethernet Device */
1243                 USB_DEVICE(0x0424, 0x9E00),
1244                 .driver_info = (unsigned long) &smsc95xx_info,
1245         },
1246         {
1247                 /* SMSC9505A USB Ethernet Device */
1248                 USB_DEVICE(0x0424, 0x9E01),
1249                 .driver_info = (unsigned long) &smsc95xx_info,
1250         },
1251         {
1252                 /* SMSC9512/9514 USB Hub & Ethernet Device */
1253                 USB_DEVICE(0x0424, 0xec00),
1254                 .driver_info = (unsigned long) &smsc95xx_info,
1255         },
1256         {
1257                 /* SMSC9500 USB Ethernet Device (SAL10) */
1258                 USB_DEVICE(0x0424, 0x9900),
1259                 .driver_info = (unsigned long) &smsc95xx_info,
1260         },
1261         {
1262                 /* SMSC9505 USB Ethernet Device (SAL10) */
1263                 USB_DEVICE(0x0424, 0x9901),
1264                 .driver_info = (unsigned long) &smsc95xx_info,
1265         },
1266         {
1267                 /* SMSC9500A USB Ethernet Device (SAL10) */
1268                 USB_DEVICE(0x0424, 0x9902),
1269                 .driver_info = (unsigned long) &smsc95xx_info,
1270         },
1271         {
1272                 /* SMSC9505A USB Ethernet Device (SAL10) */
1273                 USB_DEVICE(0x0424, 0x9903),
1274                 .driver_info = (unsigned long) &smsc95xx_info,
1275         },
1276         {
1277                 /* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
1278                 USB_DEVICE(0x0424, 0x9904),
1279                 .driver_info = (unsigned long) &smsc95xx_info,
1280         },
1281         {
1282                 /* SMSC9500A USB Ethernet Device (HAL) */
1283                 USB_DEVICE(0x0424, 0x9905),
1284                 .driver_info = (unsigned long) &smsc95xx_info,
1285         },
1286         {
1287                 /* SMSC9505A USB Ethernet Device (HAL) */
1288                 USB_DEVICE(0x0424, 0x9906),
1289                 .driver_info = (unsigned long) &smsc95xx_info,
1290         },
1291         {
1292                 /* SMSC9500 USB Ethernet Device (Alternate ID) */
1293                 USB_DEVICE(0x0424, 0x9907),
1294                 .driver_info = (unsigned long) &smsc95xx_info,
1295         },
1296         {
1297                 /* SMSC9500A USB Ethernet Device (Alternate ID) */
1298                 USB_DEVICE(0x0424, 0x9908),
1299                 .driver_info = (unsigned long) &smsc95xx_info,
1300         },
1301         {
1302                 /* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
1303                 USB_DEVICE(0x0424, 0x9909),
1304                 .driver_info = (unsigned long) &smsc95xx_info,
1305         },
1306         {
1307                 /* SMSC LAN9530 USB Ethernet Device */
1308                 USB_DEVICE(0x0424, 0x9530),
1309                 .driver_info = (unsigned long) &smsc95xx_info,
1310         },
1311         {
1312                 /* SMSC LAN9730 USB Ethernet Device */
1313                 USB_DEVICE(0x0424, 0x9730),
1314                 .driver_info = (unsigned long) &smsc95xx_info,
1315         },
1316         {
1317                 /* SMSC LAN89530 USB Ethernet Device */
1318                 USB_DEVICE(0x0424, 0x9E08),
1319                 .driver_info = (unsigned long) &smsc95xx_info,
1320         },
1321         { },            /* END */
1322 };
1323 MODULE_DEVICE_TABLE(usb, products);
1324
1325 static struct usb_driver smsc95xx_driver = {
1326         .name           = "smsc95xx",
1327         .id_table       = products,
1328         .probe          = usbnet_probe,
1329         .suspend        = usbnet_suspend,
1330         .resume         = usbnet_resume,
1331         .disconnect     = usbnet_disconnect,
1332         .disable_hub_initiated_lpm = 1,
1333 };
1334
1335 module_usb_driver(smsc95xx_driver);
1336
1337 MODULE_AUTHOR("Nancy Lin");
1338 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
1339 MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
1340 MODULE_LICENSE("GPL");