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 "smsc95xx.h"
  32
  33 #define SMSC_CHIPNAME                   "smsc95xx"
  34 #define SMSC_DRIVER_VERSION             "1.0.4"
  35 #define HS_USB_PKT_SIZE                 (512)
  36 #define FS_USB_PKT_SIZE                 (64)
  37 #define DEFAULT_HS_BURST_CAP_SIZE       (16 * 1024 + 5 * HS_USB_PKT_SIZE)
  38 #define DEFAULT_FS_BURST_CAP_SIZE       (6 * 1024 + 33 * FS_USB_PKT_SIZE)
  39 #define DEFAULT_BULK_IN_DELAY           (0x00002000)
  40 #define MAX_SINGLE_PACKET_SIZE          (2048)
  41 #define LAN95XX_EEPROM_MAGIC            (0x9500)
  42 #define EEPROM_MAC_OFFSET               (0x01)
  43 #define DEFAULT_TX_CSUM_ENABLE          (true)
  44 #define DEFAULT_RX_CSUM_ENABLE          (true)
  45 #define SMSC95XX_INTERNAL_PHY_ID        (1)
  46 #define SMSC95XX_TX_OVERHEAD            (8)
  47 #define SMSC95XX_TX_OVERHEAD_CSUM       (12)
  48
  49 struct smsc95xx_priv {
  50         u32 mac_cr;
  51         spinlock_t mac_cr_lock;
  52         bool use_tx_csum;
  53         bool use_rx_csum;
  54 };
  55
  56 struct usb_context {
  57         struct usb_ctrlrequest req;
  58         struct usbnet *dev;
  59 };
  60
  61 static int turbo_mode = true;
  62 module_param(turbo_mode, bool, 0644);
  63 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
  64
  65 static int smsc95xx_read_reg(struct usbnet *dev, u32 index, u32 *data)
  66 {
  67         u32 *buf = kmalloc(4, GFP_KERNEL);
  68         int ret;
  69
  70         BUG_ON(!dev);
  71
  72         if (!buf)
  73                 return -ENOMEM;
  74
  75         ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
  76                 USB_VENDOR_REQUEST_READ_REGISTER,
  77                 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  78                 00, index, buf, 4, USB_CTRL_GET_TIMEOUT);
  79
  80         if (unlikely(ret < 0))
  81                 netdev_warn(dev->net, "Failed to read register index 0x%08x\n", index);
  82
  83         le32_to_cpus(buf);
  84         *data = *buf;
  85         kfree(buf);
  86
  87         return ret;
  88 }
  89
  90 static int smsc95xx_write_reg(struct usbnet *dev, u32 index, u32 data)
  91 {
  92         u32 *buf = kmalloc(4, GFP_KERNEL);
  93         int ret;
  94
  95         BUG_ON(!dev);
  96
  97         if (!buf)
  98                 return -ENOMEM;
  99
 100         *buf = data;
 101         cpu_to_le32s(buf);
 102
 103         ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
 104                 USB_VENDOR_REQUEST_WRITE_REGISTER,
 105                 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 106                 00, index, buf, 4, USB_CTRL_SET_TIMEOUT);
 107
 108         if (unlikely(ret < 0))
 109                 netdev_warn(dev->net, "Failed to write register index 0x%08x\n", index);
 110
 111         kfree(buf);
 112
 113         return ret;
 114 }
 115
 116 /* Loop until the read is completed with timeout
 117  * called with phy_mutex held */
 118 static int smsc95xx_phy_wait_not_busy(struct usbnet *dev)
 119 {
 120         unsigned long start_time = jiffies;
 121         u32 val;
 122
 123         do {
 124                 smsc95xx_read_reg(dev, MII_ADDR, &val);
 125                 if (!(val & MII_BUSY_))
 126                         return 0;
 127         } while (!time_after(jiffies, start_time + HZ));
 128
 129         return -EIO;
 130 }
 131
 132 static int smsc95xx_mdio_read(struct net_device *netdev, int phy_id, int idx)
 133 {
 134         struct usbnet *dev = netdev_priv(netdev);
 135         u32 val, addr;
 136
 137         mutex_lock(&dev->phy_mutex);
 138
 139         /* confirm MII not busy */
 140         if (smsc95xx_phy_wait_not_busy(dev)) {
 141                 netdev_warn(dev->net, "MII is busy in smsc95xx_mdio_read\n");
 142                 mutex_unlock(&dev->phy_mutex);
 143                 return -EIO;
 144         }
 145
 146         /* set the address, index & direction (read from PHY) */
 147         phy_id &= dev->mii.phy_id_mask;
 148         idx &= dev->mii.reg_num_mask;
 149         addr = (phy_id << 11) | (idx << 6) | MII_READ_;
 150         smsc95xx_write_reg(dev, MII_ADDR, addr);
 151
 152         if (smsc95xx_phy_wait_not_busy(dev)) {
 153                 netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
 154                 mutex_unlock(&dev->phy_mutex);
 155                 return -EIO;
 156         }
 157
 158         smsc95xx_read_reg(dev, MII_DATA, &val);
 159
 160         mutex_unlock(&dev->phy_mutex);
 161
 162         return (u16)(val & 0xFFFF);
 163 }
 164
 165 static void smsc95xx_mdio_write(struct net_device *netdev, int phy_id, int idx,
 166                                 int regval)
 167 {
 168         struct usbnet *dev = netdev_priv(netdev);
 169         u32 val, addr;
 170
 171         mutex_lock(&dev->phy_mutex);
 172
 173         /* confirm MII not busy */
 174         if (smsc95xx_phy_wait_not_busy(dev)) {
 175                 netdev_warn(dev->net, "MII is busy in smsc95xx_mdio_write\n");
 176                 mutex_unlock(&dev->phy_mutex);
 177                 return;
 178         }
 179
 180         val = regval;
 181         smsc95xx_write_reg(dev, MII_DATA, val);
 182
 183         /* set the address, index & direction (write to PHY) */
 184         phy_id &= dev->mii.phy_id_mask;
 185         idx &= dev->mii.reg_num_mask;
 186         addr = (phy_id << 11) | (idx << 6) | MII_WRITE_;
 187         smsc95xx_write_reg(dev, MII_ADDR, addr);
 188
 189         if (smsc95xx_phy_wait_not_busy(dev))
 190                 netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
 191
 192         mutex_unlock(&dev->phy_mutex);
 193 }
 194
 195 static int smsc95xx_wait_eeprom(struct usbnet *dev)
 196 {
 197         unsigned long start_time = jiffies;
 198         u32 val;
 199
 200         do {
 201                 smsc95xx_read_reg(dev, E2P_CMD, &val);
 202                 if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
 203                         break;
 204                 udelay(40);
 205         } while (!time_after(jiffies, start_time + HZ));
 206
 207         if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
 208                 netdev_warn(dev->net, "EEPROM read operation timeout\n");
 209                 return -EIO;
 210         }
 211
 212         return 0;
 213 }
 214
 215 static int smsc95xx_eeprom_confirm_not_busy(struct usbnet *dev)
 216 {
 217         unsigned long start_time = jiffies;
 218         u32 val;
 219
 220         do {
 221                 smsc95xx_read_reg(dev, E2P_CMD, &val);
 222
 223                 if (!(val & E2P_CMD_BUSY_))
 224                         return 0;
 225
 226                 udelay(40);
 227         } while (!time_after(jiffies, start_time + HZ));
 228
 229         netdev_warn(dev->net, "EEPROM is busy\n");
 230         return -EIO;
 231 }
 232
 233 static int smsc95xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
 234                                 u8 *data)
 235 {
 236         u32 val;
 237         int i, ret;
 238
 239         BUG_ON(!dev);
 240         BUG_ON(!data);
 241
 242         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 243         if (ret)
 244                 return ret;
 245
 246         for (i = 0; i < length; i++) {
 247                 val = E2P_CMD_BUSY_ | E2P_CMD_READ_ | (offset & E2P_CMD_ADDR_);
 248                 smsc95xx_write_reg(dev, E2P_CMD, val);
 249
 250                 ret = smsc95xx_wait_eeprom(dev);
 251                 if (ret < 0)
 252                         return ret;
 253
 254                 smsc95xx_read_reg(dev, E2P_DATA, &val);
 255
 256                 data[i] = val & 0xFF;
 257                 offset++;
 258         }
 259
 260         return 0;
 261 }
 262
 263 static int smsc95xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
 264                                  u8 *data)
 265 {
 266         u32 val;
 267         int i, ret;
 268
 269         BUG_ON(!dev);
 270         BUG_ON(!data);
 271
 272         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 273         if (ret)
 274                 return ret;
 275
 276         /* Issue write/erase enable command */
 277         val = E2P_CMD_BUSY_ | E2P_CMD_EWEN_;
 278         smsc95xx_write_reg(dev, E2P_CMD, val);
 279
 280         ret = smsc95xx_wait_eeprom(dev);
 281         if (ret < 0)
 282                 return ret;
 283
 284         for (i = 0; i < length; i++) {
 285
 286                 /* Fill data register */
 287                 val = data[i];
 288                 smsc95xx_write_reg(dev, E2P_DATA, val);
 289
 290                 /* Send "write" command */
 291                 val = E2P_CMD_BUSY_ | E2P_CMD_WRITE_ | (offset & E2P_CMD_ADDR_);
 292                 smsc95xx_write_reg(dev, E2P_CMD, val);
 293
 294                 ret = smsc95xx_wait_eeprom(dev);
 295                 if (ret < 0)
 296                         return ret;
 297
 298                 offset++;
 299         }
 300
 301         return 0;
 302 }
 303
 304 static void smsc95xx_async_cmd_callback(struct urb *urb)
 305 {
 306         struct usb_context *usb_context = urb->context;
 307         struct usbnet *dev = usb_context->dev;
 308         int status = urb->status;
 309
 310         if (status < 0)
 311                 netdev_warn(dev->net, "async callback failed with %d\n", status);
 312
 313         kfree(usb_context);
 314         usb_free_urb(urb);
 315 }
 316
 317 static int smsc95xx_write_reg_async(struct usbnet *dev, u16 index, u32 *data)
 318 {
 319         struct usb_context *usb_context;
 320         int status;
 321         struct urb *urb;
 322         const u16 size = 4;
 323
 324         urb = usb_alloc_urb(0, GFP_ATOMIC);
 325         if (!urb) {
 326                 netdev_warn(dev->net, "Error allocating URB\n");
 327                 return -ENOMEM;
 328         }
 329
 330         usb_context = kmalloc(sizeof(struct usb_context), GFP_ATOMIC);
 331         if (usb_context == NULL) {
 332                 netdev_warn(dev->net, "Error allocating control msg\n");
 333                 usb_free_urb(urb);
 334                 return -ENOMEM;
 335         }
 336
 337         usb_context->req.bRequestType =
 338                 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE;
 339         usb_context->req.bRequest = USB_VENDOR_REQUEST_WRITE_REGISTER;
 340         usb_context->req.wValue = 00;
 341         usb_context->req.wIndex = cpu_to_le16(index);
 342         usb_context->req.wLength = cpu_to_le16(size);
 343
 344         usb_fill_control_urb(urb, dev->udev, usb_sndctrlpipe(dev->udev, 0),
 345                 (void *)&usb_context->req, data, size,
 346                 smsc95xx_async_cmd_callback,
 347                 (void *)usb_context);
 348
 349         status = usb_submit_urb(urb, GFP_ATOMIC);
 350         if (status < 0) {
 351                 netdev_warn(dev->net, "Error submitting control msg, sts=%d\n",
 352                             status);
 353                 kfree(usb_context);
 354                 usb_free_urb(urb);
 355         }
 356
 357         return status;
 358 }
 359
 360 /* returns hash bit number for given MAC address
 361  * example:
 362  * 01 00 5E 00 00 01 -> returns bit number 31 */
 363 static unsigned int smsc95xx_hash(char addr[ETH_ALEN])
 364 {
 365         return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
 366 }
 367
 368 static void smsc95xx_set_multicast(struct net_device *netdev)
 369 {
 370         struct usbnet *dev = netdev_priv(netdev);
 371         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 372         u32 hash_hi = 0;
 373         u32 hash_lo = 0;
 374         unsigned long flags;
 375
 376         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 377
 378         if (dev->net->flags & IFF_PROMISC) {
 379                 netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
 380                 pdata->mac_cr |= MAC_CR_PRMS_;
 381                 pdata->mac_cr &= ~(MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 382         } else if (dev->net->flags & IFF_ALLMULTI) {
 383                 netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
 384                 pdata->mac_cr |= MAC_CR_MCPAS_;
 385                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_HPFILT_);
 386         } else if (!netdev_mc_empty(dev->net)) {
 387                 struct dev_mc_list *mc_list;
 388
 389                 pdata->mac_cr |= MAC_CR_HPFILT_;
 390                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);
 391
 392                 netdev_for_each_mc_addr(mc_list, netdev) {
 393                         u32 bitnum = smsc95xx_hash(mc_list->dmi_addr);
 394                         u32 mask = 0x01 << (bitnum & 0x1F);
 395                         if (bitnum & 0x20)
 396                                 hash_hi |= mask;
 397                         else
 398                                 hash_lo |= mask;
 399                 }
 400
 401                 netif_dbg(dev, drv, dev->net, "HASHH=0x%08X, HASHL=0x%08X\n",
 402                                    hash_hi, hash_lo);
 403         } else {
 404                 netif_dbg(dev, drv, dev->net, "receive own packets only\n");
 405                 pdata->mac_cr &=
 406                         ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 407         }
 408
 409         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 410
 411         /* Initiate async writes, as we can't wait for completion here */
 412         smsc95xx_write_reg_async(dev, HASHH, &hash_hi);
 413         smsc95xx_write_reg_async(dev, HASHL, &hash_lo);
 414         smsc95xx_write_reg_async(dev, MAC_CR, &pdata->mac_cr);
 415 }
 416
 417 static void smsc95xx_phy_update_flowcontrol(struct usbnet *dev, u8 duplex,
 418                                             u16 lcladv, u16 rmtadv)
 419 {
 420         u32 flow, afc_cfg = 0;
 421
 422         int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
 423         if (ret < 0) {
 424                 netdev_warn(dev->net, "error reading AFC_CFG\n");
 425                 return;
 426         }
 427
 428         if (duplex == DUPLEX_FULL) {
 429                 u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
 430
 431                 if (cap & FLOW_CTRL_RX)
 432                         flow = 0xFFFF0002;
 433                 else
 434                         flow = 0;
 435
 436                 if (cap & FLOW_CTRL_TX)
 437                         afc_cfg |= 0xF;
 438                 else
 439                         afc_cfg &= ~0xF;
 440
 441                 netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
 442                                    cap & FLOW_CTRL_RX ? "enabled" : "disabled",
 443                                    cap & FLOW_CTRL_TX ? "enabled" : "disabled");
 444         } else {
 445                 netif_dbg(dev, link, dev->net, "half duplex\n");
 446                 flow = 0;
 447                 afc_cfg |= 0xF;
 448         }
 449
 450         smsc95xx_write_reg(dev, FLOW, flow);
 451         smsc95xx_write_reg(dev, AFC_CFG, afc_cfg);
 452 }
 453
 454 static int smsc95xx_link_reset(struct usbnet *dev)
 455 {
 456         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 457         struct mii_if_info *mii = &dev->mii;
 458         struct ethtool_cmd ecmd;
 459         unsigned long flags;
 460         u16 lcladv, rmtadv;
 461         u32 intdata;
 462
 463         /* clear interrupt status */
 464         smsc95xx_mdio_read(dev->net, mii->phy_id, PHY_INT_SRC);
 465         intdata = 0xFFFFFFFF;
 466         smsc95xx_write_reg(dev, INT_STS, intdata);
 467
 468         mii_check_media(mii, 1, 1);
 469         mii_ethtool_gset(&dev->mii, &ecmd);
 470         lcladv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_ADVERTISE);
 471         rmtadv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_LPA);
 472
 473         netif_dbg(dev, link, dev->net, "speed: %d duplex: %d lcladv: %04x rmtadv: %04x\n",
 474                   ecmd.speed, ecmd.duplex, lcladv, rmtadv);
 475
 476         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 477         if (ecmd.duplex != DUPLEX_FULL) {
 478                 pdata->mac_cr &= ~MAC_CR_FDPX_;
 479                 pdata->mac_cr |= MAC_CR_RCVOWN_;
 480         } else {
 481                 pdata->mac_cr &= ~MAC_CR_RCVOWN_;
 482                 pdata->mac_cr |= MAC_CR_FDPX_;
 483         }
 484         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 485
 486         smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 487
 488         smsc95xx_phy_update_flowcontrol(dev, ecmd.duplex, lcladv, rmtadv);
 489
 490         return 0;
 491 }
 492
 493 static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
 494 {
 495         u32 intdata;
 496
 497         if (urb->actual_length != 4) {
 498                 netdev_warn(dev->net, "unexpected urb length %d\n",
 499                             urb->actual_length);
 500                 return;
 501         }
 502
 503         memcpy(&intdata, urb->transfer_buffer, 4);
 504         le32_to_cpus(&intdata);
 505
 506         netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
 507
 508         if (intdata & INT_ENP_PHY_INT_)
 509                 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
 510         else
 511                 netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
 512                             intdata);
 513 }
 514
 515 /* Enable or disable Tx & Rx checksum offload engines */
 516 static int smsc95xx_set_csums(struct usbnet *dev)
 517 {
 518         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 519         u32 read_buf;
 520         int ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
 521         if (ret < 0) {
 522                 netdev_warn(dev->net, "Failed to read COE_CR: %d\n", ret);
 523                 return ret;
 524         }
 525
 526         if (pdata->use_tx_csum)
 527                 read_buf |= Tx_COE_EN_;
 528         else
 529                 read_buf &= ~Tx_COE_EN_;
 530
 531         if (pdata->use_rx_csum)
 532                 read_buf |= Rx_COE_EN_;
 533         else
 534                 read_buf &= ~Rx_COE_EN_;
 535
 536         ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
 537         if (ret < 0) {
 538                 netdev_warn(dev->net, "Failed to write COE_CR: %d\n", ret);
 539                 return ret;
 540         }
 541
 542         netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
 543         return 0;
 544 }
 545
 546 static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
 547 {
 548         return MAX_EEPROM_SIZE;
 549 }
 550
 551 static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
 552                                        struct ethtool_eeprom *ee, u8 *data)
 553 {
 554         struct usbnet *dev = netdev_priv(netdev);
 555
 556         ee->magic = LAN95XX_EEPROM_MAGIC;
 557
 558         return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
 559 }
 560
 561 static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
 562                                        struct ethtool_eeprom *ee, u8 *data)
 563 {
 564         struct usbnet *dev = netdev_priv(netdev);
 565
 566         if (ee->magic != LAN95XX_EEPROM_MAGIC) {
 567                 netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
 568                             ee->magic);
 569                 return -EINVAL;
 570         }
 571
 572         return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
 573 }
 574
 575 static u32 smsc95xx_ethtool_get_rx_csum(struct net_device *netdev)
 576 {
 577         struct usbnet *dev = netdev_priv(netdev);
 578         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 579
 580         return pdata->use_rx_csum;
 581 }
 582
 583 static int smsc95xx_ethtool_set_rx_csum(struct net_device *netdev, u32 val)
 584 {
 585         struct usbnet *dev = netdev_priv(netdev);
 586         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 587
 588         pdata->use_rx_csum = !!val;
 589
 590         return smsc95xx_set_csums(dev);
 591 }
 592
 593 static u32 smsc95xx_ethtool_get_tx_csum(struct net_device *netdev)
 594 {
 595         struct usbnet *dev = netdev_priv(netdev);
 596         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 597
 598         return pdata->use_tx_csum;
 599 }
 600
 601 static int smsc95xx_ethtool_set_tx_csum(struct net_device *netdev, u32 val)
 602 {
 603         struct usbnet *dev = netdev_priv(netdev);
 604         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 605
 606         pdata->use_tx_csum = !!val;
 607
 608         ethtool_op_set_tx_hw_csum(netdev, pdata->use_tx_csum);
 609         return smsc95xx_set_csums(dev);
 610 }
 611
 612 static const struct ethtool_ops smsc95xx_ethtool_ops = {
 613         .get_link       = usbnet_get_link,
 614         .nway_reset     = usbnet_nway_reset,
 615         .get_drvinfo    = usbnet_get_drvinfo,
 616         .get_msglevel   = usbnet_get_msglevel,
 617         .set_msglevel   = usbnet_set_msglevel,
 618         .get_settings   = usbnet_get_settings,
 619         .set_settings   = usbnet_set_settings,
 620         .get_eeprom_len = smsc95xx_ethtool_get_eeprom_len,
 621         .get_eeprom     = smsc95xx_ethtool_get_eeprom,
 622         .set_eeprom     = smsc95xx_ethtool_set_eeprom,
 623         .get_tx_csum    = smsc95xx_ethtool_get_tx_csum,
 624         .set_tx_csum    = smsc95xx_ethtool_set_tx_csum,
 625         .get_rx_csum    = smsc95xx_ethtool_get_rx_csum,
 626         .set_rx_csum    = smsc95xx_ethtool_set_rx_csum,
 627 };
 628
 629 static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
 630 {
 631         struct usbnet *dev = netdev_priv(netdev);
 632
 633         if (!netif_running(netdev))
 634                 return -EINVAL;
 635
 636         return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
 637 }
 638
 639 static void smsc95xx_init_mac_address(struct usbnet *dev)
 640 {
 641         /* try reading mac address from EEPROM */
 642         if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
 643                         dev->net->dev_addr) == 0) {
 644                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 645                         /* eeprom values are valid so use them */
 646                         netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
 647                         return;
 648                 }
 649         }
 650
 651         /* no eeprom, or eeprom values are invalid. generate random MAC */
 652         random_ether_addr(dev->net->dev_addr);
 653         netif_dbg(dev, ifup, dev->net, "MAC address set to random_ether_addr\n");
 654 }
 655
 656 static int smsc95xx_set_mac_address(struct usbnet *dev)
 657 {
 658         u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
 659                 dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
 660         u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
 661         int ret;
 662
 663         ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
 664         if (ret < 0) {
 665                 netdev_warn(dev->net, "Failed to write ADDRL: %d\n", ret);
 666                 return ret;
 667         }
 668
 669         ret = smsc95xx_write_reg(dev, ADDRH, addr_hi);
 670         if (ret < 0) {
 671                 netdev_warn(dev->net, "Failed to write ADDRH: %d\n", ret);
 672                 return ret;
 673         }
 674
 675         return 0;
 676 }
 677
 678 /* starts the TX path */
 679 static void smsc95xx_start_tx_path(struct usbnet *dev)
 680 {
 681         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 682         unsigned long flags;
 683         u32 reg_val;
 684
 685         /* Enable Tx at MAC */
 686         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 687         pdata->mac_cr |= MAC_CR_TXEN_;
 688         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 689
 690         smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 691
 692         /* Enable Tx at SCSRs */
 693         reg_val = TX_CFG_ON_;
 694         smsc95xx_write_reg(dev, TX_CFG, reg_val);
 695 }
 696
 697 /* Starts the Receive path */
 698 static void smsc95xx_start_rx_path(struct usbnet *dev)
 699 {
 700         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 701         unsigned long flags;
 702
 703         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 704         pdata->mac_cr |= MAC_CR_RXEN_;
 705         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 706
 707         smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 708 }
 709
 710 static int smsc95xx_phy_initialize(struct usbnet *dev)
 711 {
 712         int bmcr, timeout = 0;
 713
 714         /* Initialize MII structure */
 715         dev->mii.dev = dev->net;
 716         dev->mii.mdio_read = smsc95xx_mdio_read;
 717         dev->mii.mdio_write = smsc95xx_mdio_write;
 718         dev->mii.phy_id_mask = 0x1f;
 719         dev->mii.reg_num_mask = 0x1f;
 720         dev->mii.phy_id = SMSC95XX_INTERNAL_PHY_ID;
 721
 722         /* reset phy and wait for reset to complete */
 723         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR, BMCR_RESET);
 724
 725         do {
 726                 msleep(10);
 727                 bmcr = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, MII_BMCR);
 728                 timeout++;
 729         } while ((bmcr & MII_BMCR) && (timeout < 100));
 730
 731         if (timeout >= 100) {
 732                 netdev_warn(dev->net, "timeout on PHY Reset");
 733                 return -EIO;
 734         }
 735
 736         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_ADVERTISE,
 737                 ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP |
 738                 ADVERTISE_PAUSE_ASYM);
 739
 740         /* read to clear */
 741         smsc95xx_mdio_read(dev->net, dev->mii.phy_id, PHY_INT_SRC);
 742
 743         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, PHY_INT_MASK,
 744                 PHY_INT_MASK_DEFAULT_);
 745         mii_nway_restart(&dev->mii);
 746
 747         netif_dbg(dev, ifup, dev->net, "phy initialised successfully\n");
 748         return 0;
 749 }
 750
 751 static int smsc95xx_reset(struct usbnet *dev)
 752 {
 753         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 754         struct net_device *netdev = dev->net;
 755         u32 read_buf, write_buf, burst_cap;
 756         int ret = 0, timeout;
 757
 758         netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
 759
 760         write_buf = HW_CFG_LRST_;
 761         ret = smsc95xx_write_reg(dev, HW_CFG, write_buf);
 762         if (ret < 0) {
 763                 netdev_warn(dev->net, "Failed to write HW_CFG_LRST_ bit in HW_CFG register, ret = %d\n",
 764                             ret);
 765                 return ret;
 766         }
 767
 768         timeout = 0;
 769         do {
 770                 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 771                 if (ret < 0) {
 772                         netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
 773                         return ret;
 774                 }
 775                 msleep(10);
 776                 timeout++;
 777         } while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
 778
 779         if (timeout >= 100) {
 780                 netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
 781                 return ret;
 782         }
 783
 784         write_buf = PM_CTL_PHY_RST_;
 785         ret = smsc95xx_write_reg(dev, PM_CTRL, write_buf);
 786         if (ret < 0) {
 787                 netdev_warn(dev->net, "Failed to write PM_CTRL: %d\n", ret);
 788                 return ret;
 789         }
 790
 791         timeout = 0;
 792         do {
 793                 ret = smsc95xx_read_reg(dev, PM_CTRL, &read_buf);
 794                 if (ret < 0) {
 795                         netdev_warn(dev->net, "Failed to read PM_CTRL: %d\n", ret);
 796                         return ret;
 797                 }
 798                 msleep(10);
 799                 timeout++;
 800         } while ((read_buf & PM_CTL_PHY_RST_) && (timeout < 100));
 801
 802         if (timeout >= 100) {
 803                 netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
 804                 return ret;
 805         }
 806
 807         smsc95xx_init_mac_address(dev);
 808
 809         ret = smsc95xx_set_mac_address(dev);
 810         if (ret < 0)
 811                 return ret;
 812
 813         netif_dbg(dev, ifup, dev->net,
 814                   "MAC Address: %pM\n", dev->net->dev_addr);
 815
 816         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 817         if (ret < 0) {
 818                 netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
 819                 return ret;
 820         }
 821
 822         netif_dbg(dev, ifup, dev->net,
 823                   "Read Value from HW_CFG : 0x%08x\n", read_buf);
 824
 825         read_buf |= HW_CFG_BIR_;
 826
 827         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 828         if (ret < 0) {
 829                 netdev_warn(dev->net, "Failed to write HW_CFG_BIR_ bit in HW_CFG register, ret = %d\n",
 830                             ret);
 831                 return ret;
 832         }
 833
 834         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 835         if (ret < 0) {
 836                 netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
 837                 return ret;
 838         }
 839         netif_dbg(dev, ifup, dev->net,
 840                   "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
 841                   read_buf);
 842
 843         if (!turbo_mode) {
 844                 burst_cap = 0;
 845                 dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
 846         } else if (dev->udev->speed == USB_SPEED_HIGH) {
 847                 burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
 848                 dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
 849         } else {
 850                 burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
 851                 dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
 852         }
 853
 854         netif_dbg(dev, ifup, dev->net,
 855                   "rx_urb_size=%ld\n", (ulong)dev->rx_urb_size);
 856
 857         ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
 858         if (ret < 0) {
 859                 netdev_warn(dev->net, "Failed to write BURST_CAP: %d\n", ret);
 860                 return ret;
 861         }
 862
 863         ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
 864         if (ret < 0) {
 865                 netdev_warn(dev->net, "Failed to read BURST_CAP: %d\n", ret);
 866                 return ret;
 867         }
 868         netif_dbg(dev, ifup, dev->net,
 869                   "Read Value from BURST_CAP after writing: 0x%08x\n",
 870                   read_buf);
 871
 872         read_buf = DEFAULT_BULK_IN_DELAY;
 873         ret = smsc95xx_write_reg(dev, BULK_IN_DLY, read_buf);
 874         if (ret < 0) {
 875                 netdev_warn(dev->net, "ret = %d\n", ret);
 876                 return ret;
 877         }
 878
 879         ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
 880         if (ret < 0) {
 881                 netdev_warn(dev->net, "Failed to read BULK_IN_DLY: %d\n", ret);
 882                 return ret;
 883         }
 884         netif_dbg(dev, ifup, dev->net,
 885                   "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
 886                   read_buf);
 887
 888         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 889         if (ret < 0) {
 890                 netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
 891                 return ret;
 892         }
 893         netif_dbg(dev, ifup, dev->net,
 894                   "Read Value from HW_CFG: 0x%08x\n", read_buf);
 895
 896         if (turbo_mode)
 897                 read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
 898
 899         read_buf &= ~HW_CFG_RXDOFF_;
 900
 901         /* set Rx data offset=2, Make IP header aligns on word boundary. */
 902         read_buf |= NET_IP_ALIGN << 9;
 903
 904         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 905         if (ret < 0) {
 906                 netdev_warn(dev->net, "Failed to write HW_CFG register, ret=%d\n",
 907                             ret);
 908                 return ret;
 909         }
 910
 911         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 912         if (ret < 0) {
 913                 netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
 914                 return ret;
 915         }
 916         netif_dbg(dev, ifup, dev->net,
 917                   "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
 918
 919         write_buf = 0xFFFFFFFF;
 920         ret = smsc95xx_write_reg(dev, INT_STS, write_buf);
 921         if (ret < 0) {
 922                 netdev_warn(dev->net, "Failed to write INT_STS register, ret=%d\n",
 923                             ret);
 924                 return ret;
 925         }
 926
 927         ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
 928         if (ret < 0) {
 929                 netdev_warn(dev->net, "Failed to read ID_REV: %d\n", ret);
 930                 return ret;
 931         }
 932         netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
 933
 934         /* Configure GPIO pins as LED outputs */
 935         write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
 936                 LED_GPIO_CFG_FDX_LED;
 937         ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
 938         if (ret < 0) {
 939                 netdev_warn(dev->net, "Failed to write LED_GPIO_CFG register, ret=%d\n",
 940                             ret);
 941                 return ret;
 942         }
 943
 944         /* Init Tx */
 945         write_buf = 0;
 946         ret = smsc95xx_write_reg(dev, FLOW, write_buf);
 947         if (ret < 0) {
 948                 netdev_warn(dev->net, "Failed to write FLOW: %d\n", ret);
 949                 return ret;
 950         }
 951
 952         read_buf = AFC_CFG_DEFAULT;
 953         ret = smsc95xx_write_reg(dev, AFC_CFG, read_buf);
 954         if (ret < 0) {
 955                 netdev_warn(dev->net, "Failed to write AFC_CFG: %d\n", ret);
 956                 return ret;
 957         }
 958
 959         /* Don't need mac_cr_lock during initialisation */
 960         ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
 961         if (ret < 0) {
 962                 netdev_warn(dev->net, "Failed to read MAC_CR: %d\n", ret);
 963                 return ret;
 964         }
 965
 966         /* Init Rx */
 967         /* Set Vlan */
 968         write_buf = (u32)ETH_P_8021Q;
 969         ret = smsc95xx_write_reg(dev, VLAN1, write_buf);
 970         if (ret < 0) {
 971                 netdev_warn(dev->net, "Failed to write VAN1: %d\n", ret);
 972                 return ret;
 973         }
 974
 975         /* Enable or disable checksum offload engines */
 976         ethtool_op_set_tx_hw_csum(netdev, pdata->use_tx_csum);
 977         ret = smsc95xx_set_csums(dev);
 978         if (ret < 0) {
 979                 netdev_warn(dev->net, "Failed to set csum offload: %d\n", ret);
 980                 return ret;
 981         }
 982
 983         smsc95xx_set_multicast(dev->net);
 984
 985         if (smsc95xx_phy_initialize(dev) < 0)
 986                 return -EIO;
 987
 988         ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
 989         if (ret < 0) {
 990                 netdev_warn(dev->net, "Failed to read INT_EP_CTL: %d\n", ret);
 991                 return ret;
 992         }
 993
 994         /* enable PHY interrupts */
 995         read_buf |= INT_EP_CTL_PHY_INT_;
 996
 997         ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
 998         if (ret < 0) {
 999                 netdev_warn(dev->net, "Failed to write INT_EP_CTL: %d\n", ret);
1000                 return ret;
1001         }
1002
1003         smsc95xx_start_tx_path(dev);
1004         smsc95xx_start_rx_path(dev);
1005
1006         netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1007         return 0;
1008 }
1009
1010 static const struct net_device_ops smsc95xx_netdev_ops = {
1011         .ndo_open               = usbnet_open,
1012         .ndo_stop               = usbnet_stop,
1013         .ndo_start_xmit         = usbnet_start_xmit,
1014         .ndo_tx_timeout         = usbnet_tx_timeout,
1015         .ndo_change_mtu         = usbnet_change_mtu,
1016         .ndo_set_mac_address    = eth_mac_addr,
1017         .ndo_validate_addr      = eth_validate_addr,
1018         .ndo_do_ioctl           = smsc95xx_ioctl,
1019         .ndo_set_multicast_list = smsc95xx_set_multicast,
1020 };
1021
1022 static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1023 {
1024         struct smsc95xx_priv *pdata = NULL;
1025         int ret;
1026
1027         printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1028
1029         ret = usbnet_get_endpoints(dev, intf);
1030         if (ret < 0) {
1031                 netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1032                 return ret;
1033         }
1034
1035         dev->data[0] = (unsigned long)kzalloc(sizeof(struct smsc95xx_priv),
1036                 GFP_KERNEL);
1037
1038         pdata = (struct smsc95xx_priv *)(dev->data[0]);
1039         if (!pdata) {
1040                 netdev_warn(dev->net, "Unable to allocate struct smsc95xx_priv\n");
1041                 return -ENOMEM;
1042         }
1043
1044         spin_lock_init(&pdata->mac_cr_lock);
1045
1046         pdata->use_tx_csum = DEFAULT_TX_CSUM_ENABLE;
1047         pdata->use_rx_csum = DEFAULT_RX_CSUM_ENABLE;
1048
1049         /* Init all registers */
1050         ret = smsc95xx_reset(dev);
1051
1052         dev->net->netdev_ops = &smsc95xx_netdev_ops;
1053         dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1054         dev->net->flags |= IFF_MULTICAST;
1055         dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD;
1056         return 0;
1057 }
1058
1059 static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1060 {
1061         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1062         if (pdata) {
1063                 netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1064                 kfree(pdata);
1065                 pdata = NULL;
1066                 dev->data[0] = 0;
1067         }
1068 }
1069
1070 static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1071 {
1072         skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
1073         skb->ip_summed = CHECKSUM_COMPLETE;
1074         skb_trim(skb, skb->len - 2);
1075 }
1076
1077 static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1078 {
1079         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1080
1081         while (skb->len > 0) {
1082                 u32 header, align_count;
1083                 struct sk_buff *ax_skb;
1084                 unsigned char *packet;
1085                 u16 size;
1086
1087                 memcpy(&header, skb->data, sizeof(header));
1088                 le32_to_cpus(&header);
1089                 skb_pull(skb, 4 + NET_IP_ALIGN);
1090                 packet = skb->data;
1091
1092                 /* get the packet length */
1093                 size = (u16)((header & RX_STS_FL_) >> 16);
1094                 align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1095
1096                 if (unlikely(header & RX_STS_ES_)) {
1097                         netif_dbg(dev, rx_err, dev->net,
1098                                   "Error header=0x%08x\n", header);
1099                         dev->net->stats.rx_errors++;
1100                         dev->net->stats.rx_dropped++;
1101
1102                         if (header & RX_STS_CRC_) {
1103                                 dev->net->stats.rx_crc_errors++;
1104                         } else {
1105                                 if (header & (RX_STS_TL_ | RX_STS_RF_))
1106                                         dev->net->stats.rx_frame_errors++;
1107
1108                                 if ((header & RX_STS_LE_) &&
1109                                         (!(header & RX_STS_FT_)))
1110                                         dev->net->stats.rx_length_errors++;
1111                         }
1112                 } else {
1113                         /* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1114                         if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1115                                 netif_dbg(dev, rx_err, dev->net,
1116                                           "size err header=0x%08x\n", header);
1117                                 return 0;
1118                         }
1119
1120                         /* last frame in this batch */
1121                         if (skb->len == size) {
1122                                 if (pdata->use_rx_csum)
1123                                         smsc95xx_rx_csum_offload(skb);
1124                                 skb_trim(skb, skb->len - 4); /* remove fcs */
1125                                 skb->truesize = size + sizeof(struct sk_buff);
1126
1127                                 return 1;
1128                         }
1129
1130                         ax_skb = skb_clone(skb, GFP_ATOMIC);
1131                         if (unlikely(!ax_skb)) {
1132                                 netdev_warn(dev->net, "Error allocating skb\n");
1133                                 return 0;
1134                         }
1135
1136                         ax_skb->len = size;
1137                         ax_skb->data = packet;
1138                         skb_set_tail_pointer(ax_skb, size);
1139
1140                         if (pdata->use_rx_csum)
1141                                 smsc95xx_rx_csum_offload(ax_skb);
1142                         skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1143                         ax_skb->truesize = size + sizeof(struct sk_buff);
1144
1145                         usbnet_skb_return(dev, ax_skb);
1146                 }
1147
1148                 skb_pull(skb, size);
1149
1150                 /* padding bytes before the next frame starts */
1151                 if (skb->len)
1152                         skb_pull(skb, align_count);
1153         }
1154
1155         if (unlikely(skb->len < 0)) {
1156                 netdev_warn(dev->net, "invalid rx length<0 %d\n", skb->len);
1157                 return 0;
1158         }
1159
1160         return 1;
1161 }
1162
1163 static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1164 {
1165         int len = skb->data - skb->head;
1166         u16 high_16 = (u16)(skb->csum_offset + skb->csum_start - len);
1167         u16 low_16 = (u16)(skb->csum_start - len);
1168         return (high_16 << 16) | low_16;
1169 }
1170
1171 static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1172                                          struct sk_buff *skb, gfp_t flags)
1173 {
1174         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1175         bool csum = pdata->use_tx_csum && (skb->ip_summed == CHECKSUM_PARTIAL);
1176         int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
1177         u32 tx_cmd_a, tx_cmd_b;
1178
1179         /* We do not advertise SG, so skbs should be already linearized */
1180         BUG_ON(skb_shinfo(skb)->nr_frags);
1181
1182         if (skb_headroom(skb) < overhead) {
1183                 struct sk_buff *skb2 = skb_copy_expand(skb,
1184                         overhead, 0, flags);
1185                 dev_kfree_skb_any(skb);
1186                 skb = skb2;
1187                 if (!skb)
1188                         return NULL;
1189         }
1190
1191         if (csum) {
1192                 if (skb->len <= 45) {
1193                         /* workaround - hardware tx checksum does not work
1194                          * properly with extremely small packets */
1195                         long csstart = skb->csum_start - skb_headroom(skb);
1196                         __wsum calc = csum_partial(skb->data + csstart,
1197                                 skb->len - csstart, 0);
1198                         *((__sum16 *)(skb->data + csstart
1199                                 + skb->csum_offset)) = csum_fold(calc);
1200
1201                         csum = false;
1202                 } else {
1203                         u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
1204                         skb_push(skb, 4);
1205                         memcpy(skb->data, &csum_preamble, 4);
1206                 }
1207         }
1208
1209         skb_push(skb, 4);
1210         tx_cmd_b = (u32)(skb->len - 4);
1211         if (csum)
1212                 tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
1213         cpu_to_le32s(&tx_cmd_b);
1214         memcpy(skb->data, &tx_cmd_b, 4);
1215
1216         skb_push(skb, 4);
1217         tx_cmd_a = (u32)(skb->len - 8) | TX_CMD_A_FIRST_SEG_ |
1218                 TX_CMD_A_LAST_SEG_;
1219         cpu_to_le32s(&tx_cmd_a);
1220         memcpy(skb->data, &tx_cmd_a, 4);
1221
1222         return skb;
1223 }
1224
1225 static const struct driver_info smsc95xx_info = {
1226         .description    = "smsc95xx USB 2.0 Ethernet",
1227         .bind           = smsc95xx_bind,
1228         .unbind         = smsc95xx_unbind,
1229         .link_reset     = smsc95xx_link_reset,
1230         .reset          = smsc95xx_reset,
1231         .rx_fixup       = smsc95xx_rx_fixup,
1232         .tx_fixup       = smsc95xx_tx_fixup,
1233         .status         = smsc95xx_status,
1234         .flags          = FLAG_ETHER | FLAG_SEND_ZLP,
1235 };
1236
1237 static const struct usb_device_id products[] = {
1238         {
1239                 /* SMSC9500 USB Ethernet Device */
1240                 USB_DEVICE(0x0424, 0x9500),
1241                 .driver_info = (unsigned long) &smsc95xx_info,
1242         },
1243         {
1244                 /* SMSC9505 USB Ethernet Device */
1245                 USB_DEVICE(0x0424, 0x9505),
1246                 .driver_info = (unsigned long) &smsc95xx_info,
1247         },
1248         {
1249                 /* SMSC9500A USB Ethernet Device */
1250                 USB_DEVICE(0x0424, 0x9E00),
1251                 .driver_info = (unsigned long) &smsc95xx_info,
1252         },
1253         {
1254                 /* SMSC9505A USB Ethernet Device */
1255                 USB_DEVICE(0x0424, 0x9E01),
1256                 .driver_info = (unsigned long) &smsc95xx_info,
1257         },
1258         {
1259                 /* SMSC9512/9514 USB Hub & Ethernet Device */
1260                 USB_DEVICE(0x0424, 0xec00),
1261                 .driver_info = (unsigned long) &smsc95xx_info,
1262         },
1263         {
1264                 /* SMSC9500 USB Ethernet Device (SAL10) */
1265                 USB_DEVICE(0x0424, 0x9900),
1266                 .driver_info = (unsigned long) &smsc95xx_info,
1267         },
1268         {
1269                 /* SMSC9505 USB Ethernet Device (SAL10) */
1270                 USB_DEVICE(0x0424, 0x9901),
1271                 .driver_info = (unsigned long) &smsc95xx_info,
1272         },
1273         {
1274                 /* SMSC9500A USB Ethernet Device (SAL10) */
1275                 USB_DEVICE(0x0424, 0x9902),
1276                 .driver_info = (unsigned long) &smsc95xx_info,
1277         },
1278         {
1279                 /* SMSC9505A USB Ethernet Device (SAL10) */
1280                 USB_DEVICE(0x0424, 0x9903),
1281                 .driver_info = (unsigned long) &smsc95xx_info,
1282         },
1283         {
1284                 /* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
1285                 USB_DEVICE(0x0424, 0x9904),
1286                 .driver_info = (unsigned long) &smsc95xx_info,
1287         },
1288         {
1289                 /* SMSC9500A USB Ethernet Device (HAL) */
1290                 USB_DEVICE(0x0424, 0x9905),
1291                 .driver_info = (unsigned long) &smsc95xx_info,
1292         },
1293         {
1294                 /* SMSC9505A USB Ethernet Device (HAL) */
1295                 USB_DEVICE(0x0424, 0x9906),
1296                 .driver_info = (unsigned long) &smsc95xx_info,
1297         },
1298         {
1299                 /* SMSC9500 USB Ethernet Device (Alternate ID) */
1300                 USB_DEVICE(0x0424, 0x9907),
1301                 .driver_info = (unsigned long) &smsc95xx_info,
1302         },
1303         {
1304                 /* SMSC9500A USB Ethernet Device (Alternate ID) */
1305                 USB_DEVICE(0x0424, 0x9908),
1306                 .driver_info = (unsigned long) &smsc95xx_info,
1307         },
1308         {
1309                 /* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
1310                 USB_DEVICE(0x0424, 0x9909),
1311                 .driver_info = (unsigned long) &smsc95xx_info,
1312         },
1313         { },            /* END */
1314 };
1315 MODULE_DEVICE_TABLE(usb, products);
1316
1317 static struct usb_driver smsc95xx_driver = {
1318         .name           = "smsc95xx",
1319         .id_table       = products,
1320         .probe          = usbnet_probe,
1321         .suspend        = usbnet_suspend,
1322         .resume         = usbnet_resume,
1323         .disconnect     = usbnet_disconnect,
1324 };
1325
1326 static int __init smsc95xx_init(void)
1327 {
1328         return usb_register(&smsc95xx_driver);
1329 }
1330 module_init(smsc95xx_init);
1331
1332 static void __exit smsc95xx_exit(void)
1333 {
1334         usb_deregister(&smsc95xx_driver);
1335 }
1336 module_exit(smsc95xx_exit);
1337
1338 MODULE_AUTHOR("Nancy Lin");
1339 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@smsc.com>");
1340 MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
1341 MODULE_LICENSE("GPL");