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         spinlock_t mac_cr_lock;
  53         bool use_tx_csum;
  54         bool use_rx_csum;
  55 };
  56
  57 struct usb_context {
  58         struct usb_ctrlrequest req;
  59         struct usbnet *dev;
  60 };
  61
  62 static int 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         u32 hash_hi = 0;
 374         u32 hash_lo = 0;
 375         unsigned long flags;
 376
 377         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 378
 379         if (dev->net->flags & IFF_PROMISC) {
 380                 netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
 381                 pdata->mac_cr |= MAC_CR_PRMS_;
 382                 pdata->mac_cr &= ~(MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 383         } else if (dev->net->flags & IFF_ALLMULTI) {
 384                 netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
 385                 pdata->mac_cr |= MAC_CR_MCPAS_;
 386                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_HPFILT_);
 387         } else if (!netdev_mc_empty(dev->net)) {
 388                 struct netdev_hw_addr *ha;
 389
 390                 pdata->mac_cr |= MAC_CR_HPFILT_;
 391                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);
 392
 393                 netdev_for_each_mc_addr(ha, netdev) {
 394                         u32 bitnum = smsc95xx_hash(ha->addr);
 395                         u32 mask = 0x01 << (bitnum & 0x1F);
 396                         if (bitnum & 0x20)
 397                                 hash_hi |= mask;
 398                         else
 399                                 hash_lo |= mask;
 400                 }
 401
 402                 netif_dbg(dev, drv, dev->net, "HASHH=0x%08X, HASHL=0x%08X\n",
 403                                    hash_hi, hash_lo);
 404         } else {
 405                 netif_dbg(dev, drv, dev->net, "receive own packets only\n");
 406                 pdata->mac_cr &=
 407                         ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 408         }
 409
 410         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 411
 412         /* Initiate async writes, as we can't wait for completion here */
 413         smsc95xx_write_reg_async(dev, HASHH, &hash_hi);
 414         smsc95xx_write_reg_async(dev, HASHL, &hash_lo);
 415         smsc95xx_write_reg_async(dev, MAC_CR, &pdata->mac_cr);
 416 }
 417
 418 static void smsc95xx_phy_update_flowcontrol(struct usbnet *dev, u8 duplex,
 419                                             u16 lcladv, u16 rmtadv)
 420 {
 421         u32 flow, afc_cfg = 0;
 422
 423         int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
 424         if (ret < 0) {
 425                 netdev_warn(dev->net, "error reading AFC_CFG\n");
 426                 return;
 427         }
 428
 429         if (duplex == DUPLEX_FULL) {
 430                 u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
 431
 432                 if (cap & FLOW_CTRL_RX)
 433                         flow = 0xFFFF0002;
 434                 else
 435                         flow = 0;
 436
 437                 if (cap & FLOW_CTRL_TX)
 438                         afc_cfg |= 0xF;
 439                 else
 440                         afc_cfg &= ~0xF;
 441
 442                 netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
 443                                    cap & FLOW_CTRL_RX ? "enabled" : "disabled",
 444                                    cap & FLOW_CTRL_TX ? "enabled" : "disabled");
 445         } else {
 446                 netif_dbg(dev, link, dev->net, "half duplex\n");
 447                 flow = 0;
 448                 afc_cfg |= 0xF;
 449         }
 450
 451         smsc95xx_write_reg(dev, FLOW, flow);
 452         smsc95xx_write_reg(dev, AFC_CFG, afc_cfg);
 453 }
 454
 455 static int smsc95xx_link_reset(struct usbnet *dev)
 456 {
 457         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 458         struct mii_if_info *mii = &dev->mii;
 459         struct ethtool_cmd ecmd;
 460         unsigned long flags;
 461         u16 lcladv, rmtadv;
 462         u32 intdata;
 463
 464         /* clear interrupt status */
 465         smsc95xx_mdio_read(dev->net, mii->phy_id, PHY_INT_SRC);
 466         intdata = 0xFFFFFFFF;
 467         smsc95xx_write_reg(dev, INT_STS, intdata);
 468
 469         mii_check_media(mii, 1, 1);
 470         mii_ethtool_gset(&dev->mii, &ecmd);
 471         lcladv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_ADVERTISE);
 472         rmtadv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_LPA);
 473
 474         netif_dbg(dev, link, dev->net, "speed: %d duplex: %d lcladv: %04x rmtadv: %04x\n",
 475                   ecmd.speed, ecmd.duplex, lcladv, rmtadv);
 476
 477         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 478         if (ecmd.duplex != DUPLEX_FULL) {
 479                 pdata->mac_cr &= ~MAC_CR_FDPX_;
 480                 pdata->mac_cr |= MAC_CR_RCVOWN_;
 481         } else {
 482                 pdata->mac_cr &= ~MAC_CR_RCVOWN_;
 483                 pdata->mac_cr |= MAC_CR_FDPX_;
 484         }
 485         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 486
 487         smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 488
 489         smsc95xx_phy_update_flowcontrol(dev, ecmd.duplex, lcladv, rmtadv);
 490
 491         return 0;
 492 }
 493
 494 static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
 495 {
 496         u32 intdata;
 497
 498         if (urb->actual_length != 4) {
 499                 netdev_warn(dev->net, "unexpected urb length %d\n",
 500                             urb->actual_length);
 501                 return;
 502         }
 503
 504         memcpy(&intdata, urb->transfer_buffer, 4);
 505         le32_to_cpus(&intdata);
 506
 507         netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
 508
 509         if (intdata & INT_ENP_PHY_INT_)
 510                 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
 511         else
 512                 netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
 513                             intdata);
 514 }
 515
 516 /* Enable or disable Tx & Rx checksum offload engines */
 517 static int smsc95xx_set_csums(struct usbnet *dev)
 518 {
 519         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 520         u32 read_buf;
 521         int ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
 522         if (ret < 0) {
 523                 netdev_warn(dev->net, "Failed to read COE_CR: %d\n", ret);
 524                 return ret;
 525         }
 526
 527         if (pdata->use_tx_csum)
 528                 read_buf |= Tx_COE_EN_;
 529         else
 530                 read_buf &= ~Tx_COE_EN_;
 531
 532         if (pdata->use_rx_csum)
 533                 read_buf |= Rx_COE_EN_;
 534         else
 535                 read_buf &= ~Rx_COE_EN_;
 536
 537         ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
 538         if (ret < 0) {
 539                 netdev_warn(dev->net, "Failed to write COE_CR: %d\n", ret);
 540                 return ret;
 541         }
 542
 543         netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
 544         return 0;
 545 }
 546
 547 static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
 548 {
 549         return MAX_EEPROM_SIZE;
 550 }
 551
 552 static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
 553                                        struct ethtool_eeprom *ee, u8 *data)
 554 {
 555         struct usbnet *dev = netdev_priv(netdev);
 556
 557         ee->magic = LAN95XX_EEPROM_MAGIC;
 558
 559         return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
 560 }
 561
 562 static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
 563                                        struct ethtool_eeprom *ee, u8 *data)
 564 {
 565         struct usbnet *dev = netdev_priv(netdev);
 566
 567         if (ee->magic != LAN95XX_EEPROM_MAGIC) {
 568                 netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
 569                             ee->magic);
 570                 return -EINVAL;
 571         }
 572
 573         return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
 574 }
 575
 576 static u32 smsc95xx_ethtool_get_rx_csum(struct net_device *netdev)
 577 {
 578         struct usbnet *dev = netdev_priv(netdev);
 579         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 580
 581         return pdata->use_rx_csum;
 582 }
 583
 584 static int smsc95xx_ethtool_set_rx_csum(struct net_device *netdev, u32 val)
 585 {
 586         struct usbnet *dev = netdev_priv(netdev);
 587         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 588
 589         pdata->use_rx_csum = !!val;
 590
 591         return smsc95xx_set_csums(dev);
 592 }
 593
 594 static u32 smsc95xx_ethtool_get_tx_csum(struct net_device *netdev)
 595 {
 596         struct usbnet *dev = netdev_priv(netdev);
 597         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 598
 599         return pdata->use_tx_csum;
 600 }
 601
 602 static int smsc95xx_ethtool_set_tx_csum(struct net_device *netdev, u32 val)
 603 {
 604         struct usbnet *dev = netdev_priv(netdev);
 605         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 606
 607         pdata->use_tx_csum = !!val;
 608
 609         ethtool_op_set_tx_hw_csum(netdev, pdata->use_tx_csum);
 610         return smsc95xx_set_csums(dev);
 611 }
 612
 613 static const struct ethtool_ops smsc95xx_ethtool_ops = {
 614         .get_link       = usbnet_get_link,
 615         .nway_reset     = usbnet_nway_reset,
 616         .get_drvinfo    = usbnet_get_drvinfo,
 617         .get_msglevel   = usbnet_get_msglevel,
 618         .set_msglevel   = usbnet_set_msglevel,
 619         .get_settings   = usbnet_get_settings,
 620         .set_settings   = usbnet_set_settings,
 621         .get_eeprom_len = smsc95xx_ethtool_get_eeprom_len,
 622         .get_eeprom     = smsc95xx_ethtool_get_eeprom,
 623         .set_eeprom     = smsc95xx_ethtool_set_eeprom,
 624         .get_tx_csum    = smsc95xx_ethtool_get_tx_csum,
 625         .set_tx_csum    = smsc95xx_ethtool_set_tx_csum,
 626         .get_rx_csum    = smsc95xx_ethtool_get_rx_csum,
 627         .set_rx_csum    = smsc95xx_ethtool_set_rx_csum,
 628 };
 629
 630 static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
 631 {
 632         struct usbnet *dev = netdev_priv(netdev);
 633
 634         if (!netif_running(netdev))
 635                 return -EINVAL;
 636
 637         return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
 638 }
 639
 640 static void smsc95xx_init_mac_address(struct usbnet *dev)
 641 {
 642         /* try reading mac address from EEPROM */
 643         if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
 644                         dev->net->dev_addr) == 0) {
 645                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 646                         /* eeprom values are valid so use them */
 647                         netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
 648                         return;
 649                 }
 650         }
 651
 652         /* no eeprom, or eeprom values are invalid. generate random MAC */
 653         random_ether_addr(dev->net->dev_addr);
 654         netif_dbg(dev, ifup, dev->net, "MAC address set to random_ether_addr\n");
 655 }
 656
 657 static int smsc95xx_set_mac_address(struct usbnet *dev)
 658 {
 659         u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
 660                 dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
 661         u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
 662         int ret;
 663
 664         ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
 665         if (ret < 0) {
 666                 netdev_warn(dev->net, "Failed to write ADDRL: %d\n", ret);
 667                 return ret;
 668         }
 669
 670         ret = smsc95xx_write_reg(dev, ADDRH, addr_hi);
 671         if (ret < 0) {
 672                 netdev_warn(dev->net, "Failed to write ADDRH: %d\n", ret);
 673                 return ret;
 674         }
 675
 676         return 0;
 677 }
 678
 679 /* starts the TX path */
 680 static void smsc95xx_start_tx_path(struct usbnet *dev)
 681 {
 682         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 683         unsigned long flags;
 684         u32 reg_val;
 685
 686         /* Enable Tx at MAC */
 687         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 688         pdata->mac_cr |= MAC_CR_TXEN_;
 689         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 690
 691         smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 692
 693         /* Enable Tx at SCSRs */
 694         reg_val = TX_CFG_ON_;
 695         smsc95xx_write_reg(dev, TX_CFG, reg_val);
 696 }
 697
 698 /* Starts the Receive path */
 699 static void smsc95xx_start_rx_path(struct usbnet *dev)
 700 {
 701         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 702         unsigned long flags;
 703
 704         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 705         pdata->mac_cr |= MAC_CR_RXEN_;
 706         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 707
 708         smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 709 }
 710
 711 static int smsc95xx_phy_initialize(struct usbnet *dev)
 712 {
 713         int bmcr, timeout = 0;
 714
 715         /* Initialize MII structure */
 716         dev->mii.dev = dev->net;
 717         dev->mii.mdio_read = smsc95xx_mdio_read;
 718         dev->mii.mdio_write = smsc95xx_mdio_write;
 719         dev->mii.phy_id_mask = 0x1f;
 720         dev->mii.reg_num_mask = 0x1f;
 721         dev->mii.phy_id = SMSC95XX_INTERNAL_PHY_ID;
 722
 723         /* reset phy and wait for reset to complete */
 724         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR, BMCR_RESET);
 725
 726         do {
 727                 msleep(10);
 728                 bmcr = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, MII_BMCR);
 729                 timeout++;
 730         } while ((bmcr & MII_BMCR) && (timeout < 100));
 731
 732         if (timeout >= 100) {
 733                 netdev_warn(dev->net, "timeout on PHY Reset");
 734                 return -EIO;
 735         }
 736
 737         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_ADVERTISE,
 738                 ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP |
 739                 ADVERTISE_PAUSE_ASYM);
 740
 741         /* read to clear */
 742         smsc95xx_mdio_read(dev->net, dev->mii.phy_id, PHY_INT_SRC);
 743
 744         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, PHY_INT_MASK,
 745                 PHY_INT_MASK_DEFAULT_);
 746         mii_nway_restart(&dev->mii);
 747
 748         netif_dbg(dev, ifup, dev->net, "phy initialised successfully\n");
 749         return 0;
 750 }
 751
 752 static int smsc95xx_reset(struct usbnet *dev)
 753 {
 754         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 755         struct net_device *netdev = dev->net;
 756         u32 read_buf, write_buf, burst_cap;
 757         int ret = 0, timeout;
 758
 759         netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
 760
 761         write_buf = HW_CFG_LRST_;
 762         ret = smsc95xx_write_reg(dev, HW_CFG, write_buf);
 763         if (ret < 0) {
 764                 netdev_warn(dev->net, "Failed to write HW_CFG_LRST_ bit in HW_CFG register, ret = %d\n",
 765                             ret);
 766                 return ret;
 767         }
 768
 769         timeout = 0;
 770         do {
 771                 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 772                 if (ret < 0) {
 773                         netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
 774                         return ret;
 775                 }
 776                 msleep(10);
 777                 timeout++;
 778         } while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
 779
 780         if (timeout >= 100) {
 781                 netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
 782                 return ret;
 783         }
 784
 785         write_buf = PM_CTL_PHY_RST_;
 786         ret = smsc95xx_write_reg(dev, PM_CTRL, write_buf);
 787         if (ret < 0) {
 788                 netdev_warn(dev->net, "Failed to write PM_CTRL: %d\n", ret);
 789                 return ret;
 790         }
 791
 792         timeout = 0;
 793         do {
 794                 ret = smsc95xx_read_reg(dev, PM_CTRL, &read_buf);
 795                 if (ret < 0) {
 796                         netdev_warn(dev->net, "Failed to read PM_CTRL: %d\n", ret);
 797                         return ret;
 798                 }
 799                 msleep(10);
 800                 timeout++;
 801         } while ((read_buf & PM_CTL_PHY_RST_) && (timeout < 100));
 802
 803         if (timeout >= 100) {
 804                 netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
 805                 return ret;
 806         }
 807
 808         smsc95xx_init_mac_address(dev);
 809
 810         ret = smsc95xx_set_mac_address(dev);
 811         if (ret < 0)
 812                 return ret;
 813
 814         netif_dbg(dev, ifup, dev->net,
 815                   "MAC Address: %pM\n", dev->net->dev_addr);
 816
 817         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 818         if (ret < 0) {
 819                 netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
 820                 return ret;
 821         }
 822
 823         netif_dbg(dev, ifup, dev->net,
 824                   "Read Value from HW_CFG : 0x%08x\n", read_buf);
 825
 826         read_buf |= HW_CFG_BIR_;
 827
 828         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 829         if (ret < 0) {
 830                 netdev_warn(dev->net, "Failed to write HW_CFG_BIR_ bit in HW_CFG register, ret = %d\n",
 831                             ret);
 832                 return ret;
 833         }
 834
 835         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 836         if (ret < 0) {
 837                 netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
 838                 return ret;
 839         }
 840         netif_dbg(dev, ifup, dev->net,
 841                   "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
 842                   read_buf);
 843
 844         if (!turbo_mode) {
 845                 burst_cap = 0;
 846                 dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
 847         } else if (dev->udev->speed == USB_SPEED_HIGH) {
 848                 burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
 849                 dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
 850         } else {
 851                 burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
 852                 dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
 853         }
 854
 855         netif_dbg(dev, ifup, dev->net,
 856                   "rx_urb_size=%ld\n", (ulong)dev->rx_urb_size);
 857
 858         ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
 859         if (ret < 0) {
 860                 netdev_warn(dev->net, "Failed to write BURST_CAP: %d\n", ret);
 861                 return ret;
 862         }
 863
 864         ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
 865         if (ret < 0) {
 866                 netdev_warn(dev->net, "Failed to read BURST_CAP: %d\n", ret);
 867                 return ret;
 868         }
 869         netif_dbg(dev, ifup, dev->net,
 870                   "Read Value from BURST_CAP after writing: 0x%08x\n",
 871                   read_buf);
 872
 873         read_buf = DEFAULT_BULK_IN_DELAY;
 874         ret = smsc95xx_write_reg(dev, BULK_IN_DLY, read_buf);
 875         if (ret < 0) {
 876                 netdev_warn(dev->net, "ret = %d\n", ret);
 877                 return ret;
 878         }
 879
 880         ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
 881         if (ret < 0) {
 882                 netdev_warn(dev->net, "Failed to read BULK_IN_DLY: %d\n", ret);
 883                 return ret;
 884         }
 885         netif_dbg(dev, ifup, dev->net,
 886                   "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
 887                   read_buf);
 888
 889         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 890         if (ret < 0) {
 891                 netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
 892                 return ret;
 893         }
 894         netif_dbg(dev, ifup, dev->net,
 895                   "Read Value from HW_CFG: 0x%08x\n", read_buf);
 896
 897         if (turbo_mode)
 898                 read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
 899
 900         read_buf &= ~HW_CFG_RXDOFF_;
 901
 902         /* set Rx data offset=2, Make IP header aligns on word boundary. */
 903         read_buf |= NET_IP_ALIGN << 9;
 904
 905         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 906         if (ret < 0) {
 907                 netdev_warn(dev->net, "Failed to write HW_CFG register, ret=%d\n",
 908                             ret);
 909                 return ret;
 910         }
 911
 912         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 913         if (ret < 0) {
 914                 netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
 915                 return ret;
 916         }
 917         netif_dbg(dev, ifup, dev->net,
 918                   "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
 919
 920         write_buf = 0xFFFFFFFF;
 921         ret = smsc95xx_write_reg(dev, INT_STS, write_buf);
 922         if (ret < 0) {
 923                 netdev_warn(dev->net, "Failed to write INT_STS register, ret=%d\n",
 924                             ret);
 925                 return ret;
 926         }
 927
 928         ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
 929         if (ret < 0) {
 930                 netdev_warn(dev->net, "Failed to read ID_REV: %d\n", ret);
 931                 return ret;
 932         }
 933         netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
 934
 935         /* Configure GPIO pins as LED outputs */
 936         write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
 937                 LED_GPIO_CFG_FDX_LED;
 938         ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
 939         if (ret < 0) {
 940                 netdev_warn(dev->net, "Failed to write LED_GPIO_CFG register, ret=%d\n",
 941                             ret);
 942                 return ret;
 943         }
 944
 945         /* Init Tx */
 946         write_buf = 0;
 947         ret = smsc95xx_write_reg(dev, FLOW, write_buf);
 948         if (ret < 0) {
 949                 netdev_warn(dev->net, "Failed to write FLOW: %d\n", ret);
 950                 return ret;
 951         }
 952
 953         read_buf = AFC_CFG_DEFAULT;
 954         ret = smsc95xx_write_reg(dev, AFC_CFG, read_buf);
 955         if (ret < 0) {
 956                 netdev_warn(dev->net, "Failed to write AFC_CFG: %d\n", ret);
 957                 return ret;
 958         }
 959
 960         /* Don't need mac_cr_lock during initialisation */
 961         ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
 962         if (ret < 0) {
 963                 netdev_warn(dev->net, "Failed to read MAC_CR: %d\n", ret);
 964                 return ret;
 965         }
 966
 967         /* Init Rx */
 968         /* Set Vlan */
 969         write_buf = (u32)ETH_P_8021Q;
 970         ret = smsc95xx_write_reg(dev, VLAN1, write_buf);
 971         if (ret < 0) {
 972                 netdev_warn(dev->net, "Failed to write VAN1: %d\n", ret);
 973                 return ret;
 974         }
 975
 976         /* Enable or disable checksum offload engines */
 977         ethtool_op_set_tx_hw_csum(netdev, pdata->use_tx_csum);
 978         ret = smsc95xx_set_csums(dev);
 979         if (ret < 0) {
 980                 netdev_warn(dev->net, "Failed to set csum offload: %d\n", ret);
 981                 return ret;
 982         }
 983
 984         smsc95xx_set_multicast(dev->net);
 985
 986         if (smsc95xx_phy_initialize(dev) < 0)
 987                 return -EIO;
 988
 989         ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
 990         if (ret < 0) {
 991                 netdev_warn(dev->net, "Failed to read INT_EP_CTL: %d\n", ret);
 992                 return ret;
 993         }
 994
 995         /* enable PHY interrupts */
 996         read_buf |= INT_EP_CTL_PHY_INT_;
 997
 998         ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
 999         if (ret < 0) {
1000                 netdev_warn(dev->net, "Failed to write INT_EP_CTL: %d\n", ret);
1001                 return ret;
1002         }
1003
1004         smsc95xx_start_tx_path(dev);
1005         smsc95xx_start_rx_path(dev);
1006
1007         netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1008         return 0;
1009 }
1010
1011 static const struct net_device_ops smsc95xx_netdev_ops = {
1012         .ndo_open               = usbnet_open,
1013         .ndo_stop               = usbnet_stop,
1014         .ndo_start_xmit         = usbnet_start_xmit,
1015         .ndo_tx_timeout         = usbnet_tx_timeout,
1016         .ndo_change_mtu         = usbnet_change_mtu,
1017         .ndo_set_mac_address    = eth_mac_addr,
1018         .ndo_validate_addr      = eth_validate_addr,
1019         .ndo_do_ioctl           = smsc95xx_ioctl,
1020         .ndo_set_multicast_list = smsc95xx_set_multicast,
1021 };
1022
1023 static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1024 {
1025         struct smsc95xx_priv *pdata = NULL;
1026         int ret;
1027
1028         printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1029
1030         ret = usbnet_get_endpoints(dev, intf);
1031         if (ret < 0) {
1032                 netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1033                 return ret;
1034         }
1035
1036         dev->data[0] = (unsigned long)kzalloc(sizeof(struct smsc95xx_priv),
1037                 GFP_KERNEL);
1038
1039         pdata = (struct smsc95xx_priv *)(dev->data[0]);
1040         if (!pdata) {
1041                 netdev_warn(dev->net, "Unable to allocate struct smsc95xx_priv\n");
1042                 return -ENOMEM;
1043         }
1044
1045         spin_lock_init(&pdata->mac_cr_lock);
1046
1047         pdata->use_tx_csum = DEFAULT_TX_CSUM_ENABLE;
1048         pdata->use_rx_csum = DEFAULT_RX_CSUM_ENABLE;
1049
1050         /* Init all registers */
1051         ret = smsc95xx_reset(dev);
1052
1053         dev->net->netdev_ops = &smsc95xx_netdev_ops;
1054         dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1055         dev->net->flags |= IFF_MULTICAST;
1056         dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD;
1057         return 0;
1058 }
1059
1060 static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1061 {
1062         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1063         if (pdata) {
1064                 netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1065                 kfree(pdata);
1066                 pdata = NULL;
1067                 dev->data[0] = 0;
1068         }
1069 }
1070
1071 static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1072 {
1073         skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
1074         skb->ip_summed = CHECKSUM_COMPLETE;
1075         skb_trim(skb, skb->len - 2);
1076 }
1077
1078 static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1079 {
1080         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1081
1082         while (skb->len > 0) {
1083                 u32 header, align_count;
1084                 struct sk_buff *ax_skb;
1085                 unsigned char *packet;
1086                 u16 size;
1087
1088                 memcpy(&header, skb->data, sizeof(header));
1089                 le32_to_cpus(&header);
1090                 skb_pull(skb, 4 + NET_IP_ALIGN);
1091                 packet = skb->data;
1092
1093                 /* get the packet length */
1094                 size = (u16)((header & RX_STS_FL_) >> 16);
1095                 align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1096
1097                 if (unlikely(header & RX_STS_ES_)) {
1098                         netif_dbg(dev, rx_err, dev->net,
1099                                   "Error header=0x%08x\n", header);
1100                         dev->net->stats.rx_errors++;
1101                         dev->net->stats.rx_dropped++;
1102
1103                         if (header & RX_STS_CRC_) {
1104                                 dev->net->stats.rx_crc_errors++;
1105                         } else {
1106                                 if (header & (RX_STS_TL_ | RX_STS_RF_))
1107                                         dev->net->stats.rx_frame_errors++;
1108
1109                                 if ((header & RX_STS_LE_) &&
1110                                         (!(header & RX_STS_FT_)))
1111                                         dev->net->stats.rx_length_errors++;
1112                         }
1113                 } else {
1114                         /* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1115                         if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1116                                 netif_dbg(dev, rx_err, dev->net,
1117                                           "size err header=0x%08x\n", header);
1118                                 return 0;
1119                         }
1120
1121                         /* last frame in this batch */
1122                         if (skb->len == size) {
1123                                 if (pdata->use_rx_csum)
1124                                         smsc95xx_rx_csum_offload(skb);
1125                                 skb_trim(skb, skb->len - 4); /* remove fcs */
1126                                 skb->truesize = size + sizeof(struct sk_buff);
1127
1128                                 return 1;
1129                         }
1130
1131                         ax_skb = skb_clone(skb, GFP_ATOMIC);
1132                         if (unlikely(!ax_skb)) {
1133                                 netdev_warn(dev->net, "Error allocating skb\n");
1134                                 return 0;
1135                         }
1136
1137                         ax_skb->len = size;
1138                         ax_skb->data = packet;
1139                         skb_set_tail_pointer(ax_skb, size);
1140
1141                         if (pdata->use_rx_csum)
1142                                 smsc95xx_rx_csum_offload(ax_skb);
1143                         skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1144                         ax_skb->truesize = size + sizeof(struct sk_buff);
1145
1146                         usbnet_skb_return(dev, ax_skb);
1147                 }
1148
1149                 skb_pull(skb, size);
1150
1151                 /* padding bytes before the next frame starts */
1152                 if (skb->len)
1153                         skb_pull(skb, align_count);
1154         }
1155
1156         if (unlikely(skb->len < 0)) {
1157                 netdev_warn(dev->net, "invalid rx length<0 %d\n", skb->len);
1158                 return 0;
1159         }
1160
1161         return 1;
1162 }
1163
1164 static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1165 {
1166         int len = skb->data - skb->head;
1167         u16 high_16 = (u16)(skb->csum_offset + skb->csum_start - len);
1168         u16 low_16 = (u16)(skb->csum_start - len);
1169         return (high_16 << 16) | low_16;
1170 }
1171
1172 static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1173                                          struct sk_buff *skb, gfp_t flags)
1174 {
1175         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1176         bool csum = pdata->use_tx_csum && (skb->ip_summed == CHECKSUM_PARTIAL);
1177         int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
1178         u32 tx_cmd_a, tx_cmd_b;
1179
1180         /* We do not advertise SG, so skbs should be already linearized */
1181         BUG_ON(skb_shinfo(skb)->nr_frags);
1182
1183         if (skb_headroom(skb) < overhead) {
1184                 struct sk_buff *skb2 = skb_copy_expand(skb,
1185                         overhead, 0, flags);
1186                 dev_kfree_skb_any(skb);
1187                 skb = skb2;
1188                 if (!skb)
1189                         return NULL;
1190         }
1191
1192         if (csum) {
1193                 if (skb->len <= 45) {
1194                         /* workaround - hardware tx checksum does not work
1195                          * properly with extremely small packets */
1196                         long csstart = skb->csum_start - skb_headroom(skb);
1197                         __wsum calc = csum_partial(skb->data + csstart,
1198                                 skb->len - csstart, 0);
1199                         *((__sum16 *)(skb->data + csstart
1200                                 + skb->csum_offset)) = csum_fold(calc);
1201
1202                         csum = false;
1203                 } else {
1204                         u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
1205                         skb_push(skb, 4);
1206                         memcpy(skb->data, &csum_preamble, 4);
1207                 }
1208         }
1209
1210         skb_push(skb, 4);
1211         tx_cmd_b = (u32)(skb->len - 4);
1212         if (csum)
1213                 tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
1214         cpu_to_le32s(&tx_cmd_b);
1215         memcpy(skb->data, &tx_cmd_b, 4);
1216
1217         skb_push(skb, 4);
1218         tx_cmd_a = (u32)(skb->len - 8) | TX_CMD_A_FIRST_SEG_ |
1219                 TX_CMD_A_LAST_SEG_;
1220         cpu_to_le32s(&tx_cmd_a);
1221         memcpy(skb->data, &tx_cmd_a, 4);
1222
1223         return skb;
1224 }
1225
1226 static const struct driver_info smsc95xx_info = {
1227         .description    = "smsc95xx USB 2.0 Ethernet",
1228         .bind           = smsc95xx_bind,
1229         .unbind         = smsc95xx_unbind,
1230         .link_reset     = smsc95xx_link_reset,
1231         .reset          = smsc95xx_reset,
1232         .rx_fixup       = smsc95xx_rx_fixup,
1233         .tx_fixup       = smsc95xx_tx_fixup,
1234         .status         = smsc95xx_status,
1235         .flags          = FLAG_ETHER | FLAG_SEND_ZLP,
1236 };
1237
1238 static const struct usb_device_id products[] = {
1239         {
1240                 /* SMSC9500 USB Ethernet Device */
1241                 USB_DEVICE(0x0424, 0x9500),
1242                 .driver_info = (unsigned long) &smsc95xx_info,
1243         },
1244         {
1245                 /* SMSC9505 USB Ethernet Device */
1246                 USB_DEVICE(0x0424, 0x9505),
1247                 .driver_info = (unsigned long) &smsc95xx_info,
1248         },
1249         {
1250                 /* SMSC9500A USB Ethernet Device */
1251                 USB_DEVICE(0x0424, 0x9E00),
1252                 .driver_info = (unsigned long) &smsc95xx_info,
1253         },
1254         {
1255                 /* SMSC9505A USB Ethernet Device */
1256                 USB_DEVICE(0x0424, 0x9E01),
1257                 .driver_info = (unsigned long) &smsc95xx_info,
1258         },
1259         {
1260                 /* SMSC9512/9514 USB Hub & Ethernet Device */
1261                 USB_DEVICE(0x0424, 0xec00),
1262                 .driver_info = (unsigned long) &smsc95xx_info,
1263         },
1264         {
1265                 /* SMSC9500 USB Ethernet Device (SAL10) */
1266                 USB_DEVICE(0x0424, 0x9900),
1267                 .driver_info = (unsigned long) &smsc95xx_info,
1268         },
1269         {
1270                 /* SMSC9505 USB Ethernet Device (SAL10) */
1271                 USB_DEVICE(0x0424, 0x9901),
1272                 .driver_info = (unsigned long) &smsc95xx_info,
1273         },
1274         {
1275                 /* SMSC9500A USB Ethernet Device (SAL10) */
1276                 USB_DEVICE(0x0424, 0x9902),
1277                 .driver_info = (unsigned long) &smsc95xx_info,
1278         },
1279         {
1280                 /* SMSC9505A USB Ethernet Device (SAL10) */
1281                 USB_DEVICE(0x0424, 0x9903),
1282                 .driver_info = (unsigned long) &smsc95xx_info,
1283         },
1284         {
1285                 /* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
1286                 USB_DEVICE(0x0424, 0x9904),
1287                 .driver_info = (unsigned long) &smsc95xx_info,
1288         },
1289         {
1290                 /* SMSC9500A USB Ethernet Device (HAL) */
1291                 USB_DEVICE(0x0424, 0x9905),
1292                 .driver_info = (unsigned long) &smsc95xx_info,
1293         },
1294         {
1295                 /* SMSC9505A USB Ethernet Device (HAL) */
1296                 USB_DEVICE(0x0424, 0x9906),
1297                 .driver_info = (unsigned long) &smsc95xx_info,
1298         },
1299         {
1300                 /* SMSC9500 USB Ethernet Device (Alternate ID) */
1301                 USB_DEVICE(0x0424, 0x9907),
1302                 .driver_info = (unsigned long) &smsc95xx_info,
1303         },
1304         {
1305                 /* SMSC9500A USB Ethernet Device (Alternate ID) */
1306                 USB_DEVICE(0x0424, 0x9908),
1307                 .driver_info = (unsigned long) &smsc95xx_info,
1308         },
1309         {
1310                 /* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
1311                 USB_DEVICE(0x0424, 0x9909),
1312                 .driver_info = (unsigned long) &smsc95xx_info,
1313         },
1314         { },            /* END */
1315 };
1316 MODULE_DEVICE_TABLE(usb, products);
1317
1318 static struct usb_driver smsc95xx_driver = {
1319         .name           = "smsc95xx",
1320         .id_table       = products,
1321         .probe          = usbnet_probe,
1322         .suspend        = usbnet_suspend,
1323         .resume         = usbnet_resume,
1324         .disconnect     = usbnet_disconnect,
1325 };
1326
1327 static int __init smsc95xx_init(void)
1328 {
1329         return usb_register(&smsc95xx_driver);
1330 }
1331 module_init(smsc95xx_init);
1332
1333 static void __exit smsc95xx_exit(void)
1334 {
1335         usb_deregister(&smsc95xx_driver);
1336 }
1337 module_exit(smsc95xx_exit);
1338
1339 MODULE_AUTHOR("Nancy Lin");
1340 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@smsc.com>");
1341 MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
1342 MODULE_LICENSE("GPL");