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, see <http://www.gnu.org/licenses/>.
  17  *
  18  *****************************************************************************/
  19
  20 #include <linux/module.h>
  21 #include <linux/kmod.h>
  22 #include <linux/init.h>
  23 #include <linux/netdevice.h>
  24 #include <linux/etherdevice.h>
  25 #include <linux/ethtool.h>
  26 #include <linux/mii.h>
  27 #include <linux/usb.h>
  28 #include <linux/bitrev.h>
  29 #include <linux/crc16.h>
  30 #include <linux/crc32.h>
  31 #include <linux/usb/usbnet.h>
  32 #include <linux/slab.h>
  33 #include "smsc95xx.h"
  34
  35 #define SMSC_CHIPNAME                   "smsc95xx"
  36 #define SMSC_DRIVER_VERSION             "1.0.4"
  37 #define HS_USB_PKT_SIZE                 (512)
  38 #define FS_USB_PKT_SIZE                 (64)
  39 #define DEFAULT_HS_BURST_CAP_SIZE       (16 * 1024 + 5 * HS_USB_PKT_SIZE)
  40 #define DEFAULT_FS_BURST_CAP_SIZE       (6 * 1024 + 33 * FS_USB_PKT_SIZE)
  41 #define DEFAULT_BULK_IN_DELAY           (0x00002000)
  42 #define MAX_SINGLE_PACKET_SIZE          (2048)
  43 #define LAN95XX_EEPROM_MAGIC            (0x9500)
  44 #define EEPROM_MAC_OFFSET               (0x01)
  45 #define DEFAULT_TX_CSUM_ENABLE          (true)
  46 #define DEFAULT_RX_CSUM_ENABLE          (true)
  47 #define SMSC95XX_INTERNAL_PHY_ID        (1)
  48 #define SMSC95XX_TX_OVERHEAD            (8)
  49 #define SMSC95XX_TX_OVERHEAD_CSUM       (12)
  50 #define SUPPORTED_WAKE                  (WAKE_PHY | WAKE_UCAST | WAKE_BCAST | \
  51                                          WAKE_MCAST | WAKE_ARP | WAKE_MAGIC)
  52
  53 #define FEATURE_8_WAKEUP_FILTERS        (0x01)
  54 #define FEATURE_PHY_NLP_CROSSOVER       (0x02)
  55 #define FEATURE_REMOTE_WAKEUP           (0x04)
  56
  57 #define SUSPEND_SUSPEND0                (0x01)
  58 #define SUSPEND_SUSPEND1                (0x02)
  59 #define SUSPEND_SUSPEND2                (0x04)
  60 #define SUSPEND_SUSPEND3                (0x08)
  61 #define SUSPEND_ALLMODES                (SUSPEND_SUSPEND0 | SUSPEND_SUSPEND1 | \
  62                                          SUSPEND_SUSPEND2 | SUSPEND_SUSPEND3)
  63
  64 struct smsc95xx_priv {
  65         u32 mac_cr;
  66         u32 hash_hi;
  67         u32 hash_lo;
  68         u32 wolopts;
  69         spinlock_t mac_cr_lock;
  70         u8 features;
  71         u8 suspend_flags;
  72 };
  73
  74 static bool turbo_mode = true;
  75 module_param(turbo_mode, bool, 0644);
  76 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
  77
  78 static int __must_check __smsc95xx_read_reg(struct usbnet *dev, u32 index,
  79                                             u32 *data, int in_pm)
  80 {
  81         u32 buf;
  82         int ret;
  83         int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
  84
  85         BUG_ON(!dev);
  86
  87         if (!in_pm)
  88                 fn = usbnet_read_cmd;
  89         else
  90                 fn = usbnet_read_cmd_nopm;
  91
  92         ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
  93                  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  94                  0, index, &buf, 4);
  95         if (unlikely(ret < 0))
  96                 netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d\n",
  97                             index, ret);
  98
  99         le32_to_cpus(&buf);
 100         *data = buf;
 101
 102         return ret;
 103 }
 104
 105 static int __must_check __smsc95xx_write_reg(struct usbnet *dev, u32 index,
 106                                              u32 data, int in_pm)
 107 {
 108         u32 buf;
 109         int ret;
 110         int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
 111
 112         BUG_ON(!dev);
 113
 114         if (!in_pm)
 115                 fn = usbnet_write_cmd;
 116         else
 117                 fn = usbnet_write_cmd_nopm;
 118
 119         buf = data;
 120         cpu_to_le32s(&buf);
 121
 122         ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
 123                  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 124                  0, index, &buf, 4);
 125         if (unlikely(ret < 0))
 126                 netdev_warn(dev->net, "Failed to write reg index 0x%08x: %d\n",
 127                             index, ret);
 128
 129         return ret;
 130 }
 131
 132 static int __must_check smsc95xx_read_reg_nopm(struct usbnet *dev, u32 index,
 133                                                u32 *data)
 134 {
 135         return __smsc95xx_read_reg(dev, index, data, 1);
 136 }
 137
 138 static int __must_check smsc95xx_write_reg_nopm(struct usbnet *dev, u32 index,
 139                                                 u32 data)
 140 {
 141         return __smsc95xx_write_reg(dev, index, data, 1);
 142 }
 143
 144 static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
 145                                           u32 *data)
 146 {
 147         return __smsc95xx_read_reg(dev, index, data, 0);
 148 }
 149
 150 static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
 151                                            u32 data)
 152 {
 153         return __smsc95xx_write_reg(dev, index, data, 0);
 154 }
 155
 156 /* Loop until the read is completed with timeout
 157  * called with phy_mutex held */
 158 static int __must_check __smsc95xx_phy_wait_not_busy(struct usbnet *dev,
 159                                                      int in_pm)
 160 {
 161         unsigned long start_time = jiffies;
 162         u32 val;
 163         int ret;
 164
 165         do {
 166                 ret = __smsc95xx_read_reg(dev, MII_ADDR, &val, in_pm);
 167                 if (ret < 0) {
 168                         netdev_warn(dev->net, "Error reading MII_ACCESS\n");
 169                         return ret;
 170                 }
 171
 172                 if (!(val & MII_BUSY_))
 173                         return 0;
 174         } while (!time_after(jiffies, start_time + HZ));
 175
 176         return -EIO;
 177 }
 178
 179 static int __smsc95xx_mdio_read(struct net_device *netdev, int phy_id, int idx,
 180                                 int in_pm)
 181 {
 182         struct usbnet *dev = netdev_priv(netdev);
 183         u32 val, addr;
 184         int ret;
 185
 186         mutex_lock(&dev->phy_mutex);
 187
 188         /* confirm MII not busy */
 189         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 190         if (ret < 0) {
 191                 netdev_warn(dev->net, "MII is busy in smsc95xx_mdio_read\n");
 192                 goto done;
 193         }
 194
 195         /* set the address, index & direction (read from PHY) */
 196         phy_id &= dev->mii.phy_id_mask;
 197         idx &= dev->mii.reg_num_mask;
 198         addr = (phy_id << 11) | (idx << 6) | MII_READ_ | MII_BUSY_;
 199         ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
 200         if (ret < 0) {
 201                 netdev_warn(dev->net, "Error writing MII_ADDR\n");
 202                 goto done;
 203         }
 204
 205         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 206         if (ret < 0) {
 207                 netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
 208                 goto done;
 209         }
 210
 211         ret = __smsc95xx_read_reg(dev, MII_DATA, &val, in_pm);
 212         if (ret < 0) {
 213                 netdev_warn(dev->net, "Error reading MII_DATA\n");
 214                 goto done;
 215         }
 216
 217         ret = (u16)(val & 0xFFFF);
 218
 219 done:
 220         mutex_unlock(&dev->phy_mutex);
 221         return ret;
 222 }
 223
 224 static void __smsc95xx_mdio_write(struct net_device *netdev, int phy_id,
 225                                   int idx, int regval, int in_pm)
 226 {
 227         struct usbnet *dev = netdev_priv(netdev);
 228         u32 val, addr;
 229         int ret;
 230
 231         mutex_lock(&dev->phy_mutex);
 232
 233         /* confirm MII not busy */
 234         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 235         if (ret < 0) {
 236                 netdev_warn(dev->net, "MII is busy in smsc95xx_mdio_write\n");
 237                 goto done;
 238         }
 239
 240         val = regval;
 241         ret = __smsc95xx_write_reg(dev, MII_DATA, val, in_pm);
 242         if (ret < 0) {
 243                 netdev_warn(dev->net, "Error writing MII_DATA\n");
 244                 goto done;
 245         }
 246
 247         /* set the address, index & direction (write to PHY) */
 248         phy_id &= dev->mii.phy_id_mask;
 249         idx &= dev->mii.reg_num_mask;
 250         addr = (phy_id << 11) | (idx << 6) | MII_WRITE_ | MII_BUSY_;
 251         ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
 252         if (ret < 0) {
 253                 netdev_warn(dev->net, "Error writing MII_ADDR\n");
 254                 goto done;
 255         }
 256
 257         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 258         if (ret < 0) {
 259                 netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
 260                 goto done;
 261         }
 262
 263 done:
 264         mutex_unlock(&dev->phy_mutex);
 265 }
 266
 267 static int smsc95xx_mdio_read_nopm(struct net_device *netdev, int phy_id,
 268                                    int idx)
 269 {
 270         return __smsc95xx_mdio_read(netdev, phy_id, idx, 1);
 271 }
 272
 273 static void smsc95xx_mdio_write_nopm(struct net_device *netdev, int phy_id,
 274                                      int idx, int regval)
 275 {
 276         __smsc95xx_mdio_write(netdev, phy_id, idx, regval, 1);
 277 }
 278
 279 static int smsc95xx_mdio_read(struct net_device *netdev, int phy_id, int idx)
 280 {
 281         return __smsc95xx_mdio_read(netdev, phy_id, idx, 0);
 282 }
 283
 284 static void smsc95xx_mdio_write(struct net_device *netdev, int phy_id, int idx,
 285                                 int regval)
 286 {
 287         __smsc95xx_mdio_write(netdev, phy_id, idx, regval, 0);
 288 }
 289
 290 static int __must_check smsc95xx_wait_eeprom(struct usbnet *dev)
 291 {
 292         unsigned long start_time = jiffies;
 293         u32 val;
 294         int ret;
 295
 296         do {
 297                 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
 298                 if (ret < 0) {
 299                         netdev_warn(dev->net, "Error reading E2P_CMD\n");
 300                         return ret;
 301                 }
 302
 303                 if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
 304                         break;
 305                 udelay(40);
 306         } while (!time_after(jiffies, start_time + HZ));
 307
 308         if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
 309                 netdev_warn(dev->net, "EEPROM read operation timeout\n");
 310                 return -EIO;
 311         }
 312
 313         return 0;
 314 }
 315
 316 static int __must_check smsc95xx_eeprom_confirm_not_busy(struct usbnet *dev)
 317 {
 318         unsigned long start_time = jiffies;
 319         u32 val;
 320         int ret;
 321
 322         do {
 323                 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
 324                 if (ret < 0) {
 325                         netdev_warn(dev->net, "Error reading E2P_CMD\n");
 326                         return ret;
 327                 }
 328
 329                 if (!(val & E2P_CMD_BUSY_))
 330                         return 0;
 331
 332                 udelay(40);
 333         } while (!time_after(jiffies, start_time + HZ));
 334
 335         netdev_warn(dev->net, "EEPROM is busy\n");
 336         return -EIO;
 337 }
 338
 339 static int smsc95xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
 340                                 u8 *data)
 341 {
 342         u32 val;
 343         int i, ret;
 344
 345         BUG_ON(!dev);
 346         BUG_ON(!data);
 347
 348         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 349         if (ret)
 350                 return ret;
 351
 352         for (i = 0; i < length; i++) {
 353                 val = E2P_CMD_BUSY_ | E2P_CMD_READ_ | (offset & E2P_CMD_ADDR_);
 354                 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 355                 if (ret < 0) {
 356                         netdev_warn(dev->net, "Error writing E2P_CMD\n");
 357                         return ret;
 358                 }
 359
 360                 ret = smsc95xx_wait_eeprom(dev);
 361                 if (ret < 0)
 362                         return ret;
 363
 364                 ret = smsc95xx_read_reg(dev, E2P_DATA, &val);
 365                 if (ret < 0) {
 366                         netdev_warn(dev->net, "Error reading E2P_DATA\n");
 367                         return ret;
 368                 }
 369
 370                 data[i] = val & 0xFF;
 371                 offset++;
 372         }
 373
 374         return 0;
 375 }
 376
 377 static int smsc95xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
 378                                  u8 *data)
 379 {
 380         u32 val;
 381         int i, ret;
 382
 383         BUG_ON(!dev);
 384         BUG_ON(!data);
 385
 386         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 387         if (ret)
 388                 return ret;
 389
 390         /* Issue write/erase enable command */
 391         val = E2P_CMD_BUSY_ | E2P_CMD_EWEN_;
 392         ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 393         if (ret < 0) {
 394                 netdev_warn(dev->net, "Error writing E2P_DATA\n");
 395                 return ret;
 396         }
 397
 398         ret = smsc95xx_wait_eeprom(dev);
 399         if (ret < 0)
 400                 return ret;
 401
 402         for (i = 0; i < length; i++) {
 403
 404                 /* Fill data register */
 405                 val = data[i];
 406                 ret = smsc95xx_write_reg(dev, E2P_DATA, val);
 407                 if (ret < 0) {
 408                         netdev_warn(dev->net, "Error writing E2P_DATA\n");
 409                         return ret;
 410                 }
 411
 412                 /* Send "write" command */
 413                 val = E2P_CMD_BUSY_ | E2P_CMD_WRITE_ | (offset & E2P_CMD_ADDR_);
 414                 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 415                 if (ret < 0) {
 416                         netdev_warn(dev->net, "Error writing E2P_CMD\n");
 417                         return ret;
 418                 }
 419
 420                 ret = smsc95xx_wait_eeprom(dev);
 421                 if (ret < 0)
 422                         return ret;
 423
 424                 offset++;
 425         }
 426
 427         return 0;
 428 }
 429
 430 static int __must_check smsc95xx_write_reg_async(struct usbnet *dev, u16 index,
 431                                                  u32 data)
 432 {
 433         const u16 size = 4;
 434         u32 buf;
 435         int ret;
 436
 437         buf = data;
 438         cpu_to_le32s(&buf);
 439
 440         ret = usbnet_write_cmd_async(dev, USB_VENDOR_REQUEST_WRITE_REGISTER,
 441                                      USB_DIR_OUT | USB_TYPE_VENDOR |
 442                                      USB_RECIP_DEVICE,
 443                                      0, index, &buf, size);
 444         if (ret < 0)
 445                 netdev_warn(dev->net, "Error write async cmd, sts=%d\n",
 446                             ret);
 447         return ret;
 448 }
 449
 450 /* returns hash bit number for given MAC address
 451  * example:
 452  * 01 00 5E 00 00 01 -> returns bit number 31 */
 453 static unsigned int smsc95xx_hash(char addr[ETH_ALEN])
 454 {
 455         return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
 456 }
 457
 458 static void smsc95xx_set_multicast(struct net_device *netdev)
 459 {
 460         struct usbnet *dev = netdev_priv(netdev);
 461         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 462         unsigned long flags;
 463         int ret;
 464
 465         pdata->hash_hi = 0;
 466         pdata->hash_lo = 0;
 467
 468         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 469
 470         if (dev->net->flags & IFF_PROMISC) {
 471                 netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
 472                 pdata->mac_cr |= MAC_CR_PRMS_;
 473                 pdata->mac_cr &= ~(MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 474         } else if (dev->net->flags & IFF_ALLMULTI) {
 475                 netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
 476                 pdata->mac_cr |= MAC_CR_MCPAS_;
 477                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_HPFILT_);
 478         } else if (!netdev_mc_empty(dev->net)) {
 479                 struct netdev_hw_addr *ha;
 480
 481                 pdata->mac_cr |= MAC_CR_HPFILT_;
 482                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);
 483
 484                 netdev_for_each_mc_addr(ha, netdev) {
 485                         u32 bitnum = smsc95xx_hash(ha->addr);
 486                         u32 mask = 0x01 << (bitnum & 0x1F);
 487                         if (bitnum & 0x20)
 488                                 pdata->hash_hi |= mask;
 489                         else
 490                                 pdata->hash_lo |= mask;
 491                 }
 492
 493                 netif_dbg(dev, drv, dev->net, "HASHH=0x%08X, HASHL=0x%08X\n",
 494                                    pdata->hash_hi, pdata->hash_lo);
 495         } else {
 496                 netif_dbg(dev, drv, dev->net, "receive own packets only\n");
 497                 pdata->mac_cr &=
 498                         ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 499         }
 500
 501         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 502
 503         /* Initiate async writes, as we can't wait for completion here */
 504         ret = smsc95xx_write_reg_async(dev, HASHH, pdata->hash_hi);
 505         if (ret < 0)
 506                 netdev_warn(dev->net, "failed to initiate async write to HASHH\n");
 507
 508         ret = smsc95xx_write_reg_async(dev, HASHL, pdata->hash_lo);
 509         if (ret < 0)
 510                 netdev_warn(dev->net, "failed to initiate async write to HASHL\n");
 511
 512         ret = smsc95xx_write_reg_async(dev, MAC_CR, pdata->mac_cr);
 513         if (ret < 0)
 514                 netdev_warn(dev->net, "failed to initiate async write to MAC_CR\n");
 515 }
 516
 517 static int smsc95xx_phy_update_flowcontrol(struct usbnet *dev, u8 duplex,
 518                                            u16 lcladv, u16 rmtadv)
 519 {
 520         u32 flow, afc_cfg = 0;
 521
 522         int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
 523         if (ret < 0)
 524                 return ret;
 525
 526         if (duplex == DUPLEX_FULL) {
 527                 u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
 528
 529                 if (cap & FLOW_CTRL_RX)
 530                         flow = 0xFFFF0002;
 531                 else
 532                         flow = 0;
 533
 534                 if (cap & FLOW_CTRL_TX)
 535                         afc_cfg |= 0xF;
 536                 else
 537                         afc_cfg &= ~0xF;
 538
 539                 netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
 540                                    cap & FLOW_CTRL_RX ? "enabled" : "disabled",
 541                                    cap & FLOW_CTRL_TX ? "enabled" : "disabled");
 542         } else {
 543                 netif_dbg(dev, link, dev->net, "half duplex\n");
 544                 flow = 0;
 545                 afc_cfg |= 0xF;
 546         }
 547
 548         ret = smsc95xx_write_reg(dev, FLOW, flow);
 549         if (ret < 0)
 550                 return ret;
 551
 552         return smsc95xx_write_reg(dev, AFC_CFG, afc_cfg);
 553 }
 554
 555 static int smsc95xx_link_reset(struct usbnet *dev)
 556 {
 557         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 558         struct mii_if_info *mii = &dev->mii;
 559         struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
 560         unsigned long flags;
 561         u16 lcladv, rmtadv;
 562         int ret;
 563
 564         /* clear interrupt status */
 565         ret = smsc95xx_mdio_read(dev->net, mii->phy_id, PHY_INT_SRC);
 566         if (ret < 0)
 567                 return ret;
 568
 569         ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
 570         if (ret < 0)
 571                 return ret;
 572
 573         mii_check_media(mii, 1, 1);
 574         mii_ethtool_gset(&dev->mii, &ecmd);
 575         lcladv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_ADVERTISE);
 576         rmtadv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_LPA);
 577
 578         netif_dbg(dev, link, dev->net,
 579                   "speed: %u duplex: %d lcladv: %04x rmtadv: %04x\n",
 580                   ethtool_cmd_speed(&ecmd), ecmd.duplex, lcladv, rmtadv);
 581
 582         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 583         if (ecmd.duplex != DUPLEX_FULL) {
 584                 pdata->mac_cr &= ~MAC_CR_FDPX_;
 585                 pdata->mac_cr |= MAC_CR_RCVOWN_;
 586         } else {
 587                 pdata->mac_cr &= ~MAC_CR_RCVOWN_;
 588                 pdata->mac_cr |= MAC_CR_FDPX_;
 589         }
 590         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 591
 592         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 593         if (ret < 0)
 594                 return ret;
 595
 596         ret = smsc95xx_phy_update_flowcontrol(dev, ecmd.duplex, lcladv, rmtadv);
 597         if (ret < 0)
 598                 netdev_warn(dev->net, "Error updating PHY flow control\n");
 599
 600         return ret;
 601 }
 602
 603 static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
 604 {
 605         u32 intdata;
 606
 607         if (urb->actual_length != 4) {
 608                 netdev_warn(dev->net, "unexpected urb length %d\n",
 609                             urb->actual_length);
 610                 return;
 611         }
 612
 613         memcpy(&intdata, urb->transfer_buffer, 4);
 614         le32_to_cpus(&intdata);
 615
 616         netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
 617
 618         if (intdata & INT_ENP_PHY_INT_)
 619                 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
 620         else
 621                 netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
 622                             intdata);
 623 }
 624
 625 /* Enable or disable Tx & Rx checksum offload engines */
 626 static int smsc95xx_set_features(struct net_device *netdev,
 627         netdev_features_t features)
 628 {
 629         struct usbnet *dev = netdev_priv(netdev);
 630         u32 read_buf;
 631         int ret;
 632
 633         ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
 634         if (ret < 0)
 635                 return ret;
 636
 637         if (features & NETIF_F_HW_CSUM)
 638                 read_buf |= Tx_COE_EN_;
 639         else
 640                 read_buf &= ~Tx_COE_EN_;
 641
 642         if (features & NETIF_F_RXCSUM)
 643                 read_buf |= Rx_COE_EN_;
 644         else
 645                 read_buf &= ~Rx_COE_EN_;
 646
 647         ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
 648         if (ret < 0)
 649                 return ret;
 650
 651         netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
 652         return 0;
 653 }
 654
 655 static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
 656 {
 657         return MAX_EEPROM_SIZE;
 658 }
 659
 660 static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
 661                                        struct ethtool_eeprom *ee, u8 *data)
 662 {
 663         struct usbnet *dev = netdev_priv(netdev);
 664
 665         ee->magic = LAN95XX_EEPROM_MAGIC;
 666
 667         return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
 668 }
 669
 670 static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
 671                                        struct ethtool_eeprom *ee, u8 *data)
 672 {
 673         struct usbnet *dev = netdev_priv(netdev);
 674
 675         if (ee->magic != LAN95XX_EEPROM_MAGIC) {
 676                 netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
 677                             ee->magic);
 678                 return -EINVAL;
 679         }
 680
 681         return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
 682 }
 683
 684 static int smsc95xx_ethtool_getregslen(struct net_device *netdev)
 685 {
 686         /* all smsc95xx registers */
 687         return COE_CR - ID_REV + sizeof(u32);
 688 }
 689
 690 static void
 691 smsc95xx_ethtool_getregs(struct net_device *netdev, struct ethtool_regs *regs,
 692                          void *buf)
 693 {
 694         struct usbnet *dev = netdev_priv(netdev);
 695         unsigned int i, j;
 696         int retval;
 697         u32 *data = buf;
 698
 699         retval = smsc95xx_read_reg(dev, ID_REV, &regs->version);
 700         if (retval < 0) {
 701                 netdev_warn(netdev, "REGS: cannot read ID_REV\n");
 702                 return;
 703         }
 704
 705         for (i = ID_REV, j = 0; i <= COE_CR; i += (sizeof(u32)), j++) {
 706                 retval = smsc95xx_read_reg(dev, i, &data[j]);
 707                 if (retval < 0) {
 708                         netdev_warn(netdev, "REGS: cannot read reg[%x]\n", i);
 709                         return;
 710                 }
 711         }
 712 }
 713
 714 static void smsc95xx_ethtool_get_wol(struct net_device *net,
 715                                      struct ethtool_wolinfo *wolinfo)
 716 {
 717         struct usbnet *dev = netdev_priv(net);
 718         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 719
 720         wolinfo->supported = SUPPORTED_WAKE;
 721         wolinfo->wolopts = pdata->wolopts;
 722 }
 723
 724 static int smsc95xx_ethtool_set_wol(struct net_device *net,
 725                                     struct ethtool_wolinfo *wolinfo)
 726 {
 727         struct usbnet *dev = netdev_priv(net);
 728         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 729         int ret;
 730
 731         pdata->wolopts = wolinfo->wolopts & SUPPORTED_WAKE;
 732
 733         ret = device_set_wakeup_enable(&dev->udev->dev, pdata->wolopts);
 734         if (ret < 0)
 735                 netdev_warn(dev->net, "device_set_wakeup_enable error %d\n", ret);
 736
 737         return ret;
 738 }
 739
 740 static const struct ethtool_ops smsc95xx_ethtool_ops = {
 741         .get_link       = usbnet_get_link,
 742         .nway_reset     = usbnet_nway_reset,
 743         .get_drvinfo    = usbnet_get_drvinfo,
 744         .get_msglevel   = usbnet_get_msglevel,
 745         .set_msglevel   = usbnet_set_msglevel,
 746         .get_settings   = usbnet_get_settings,
 747         .set_settings   = usbnet_set_settings,
 748         .get_eeprom_len = smsc95xx_ethtool_get_eeprom_len,
 749         .get_eeprom     = smsc95xx_ethtool_get_eeprom,
 750         .set_eeprom     = smsc95xx_ethtool_set_eeprom,
 751         .get_regs_len   = smsc95xx_ethtool_getregslen,
 752         .get_regs       = smsc95xx_ethtool_getregs,
 753         .get_wol        = smsc95xx_ethtool_get_wol,
 754         .set_wol        = smsc95xx_ethtool_set_wol,
 755 };
 756
 757 static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
 758 {
 759         struct usbnet *dev = netdev_priv(netdev);
 760
 761         if (!netif_running(netdev))
 762                 return -EINVAL;
 763
 764         return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
 765 }
 766
 767 static void smsc95xx_init_mac_address(struct usbnet *dev)
 768 {
 769         /* try reading mac address from EEPROM */
 770         if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
 771                         dev->net->dev_addr) == 0) {
 772                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 773                         /* eeprom values are valid so use them */
 774                         netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
 775                         return;
 776                 }
 777         }
 778
 779         /* no eeprom, or eeprom values are invalid. generate random MAC */
 780         eth_hw_addr_random(dev->net);
 781         netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
 782 }
 783
 784 static int smsc95xx_set_mac_address(struct usbnet *dev)
 785 {
 786         u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
 787                 dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
 788         u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
 789         int ret;
 790
 791         ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
 792         if (ret < 0)
 793                 return ret;
 794
 795         return smsc95xx_write_reg(dev, ADDRH, addr_hi);
 796 }
 797
 798 /* starts the TX path */
 799 static int smsc95xx_start_tx_path(struct usbnet *dev)
 800 {
 801         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 802         unsigned long flags;
 803         int ret;
 804
 805         /* Enable Tx at MAC */
 806         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 807         pdata->mac_cr |= MAC_CR_TXEN_;
 808         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 809
 810         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 811         if (ret < 0)
 812                 return ret;
 813
 814         /* Enable Tx at SCSRs */
 815         return smsc95xx_write_reg(dev, TX_CFG, TX_CFG_ON_);
 816 }
 817
 818 /* Starts the Receive path */
 819 static int smsc95xx_start_rx_path(struct usbnet *dev, int in_pm)
 820 {
 821         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 822         unsigned long flags;
 823
 824         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 825         pdata->mac_cr |= MAC_CR_RXEN_;
 826         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 827
 828         return __smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr, in_pm);
 829 }
 830
 831 static int smsc95xx_phy_initialize(struct usbnet *dev)
 832 {
 833         int bmcr, ret, timeout = 0;
 834
 835         /* Initialize MII structure */
 836         dev->mii.dev = dev->net;
 837         dev->mii.mdio_read = smsc95xx_mdio_read;
 838         dev->mii.mdio_write = smsc95xx_mdio_write;
 839         dev->mii.phy_id_mask = 0x1f;
 840         dev->mii.reg_num_mask = 0x1f;
 841         dev->mii.phy_id = SMSC95XX_INTERNAL_PHY_ID;
 842
 843         /* reset phy and wait for reset to complete */
 844         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR, BMCR_RESET);
 845
 846         do {
 847                 msleep(10);
 848                 bmcr = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, MII_BMCR);
 849                 timeout++;
 850         } while ((bmcr & BMCR_RESET) && (timeout < 100));
 851
 852         if (timeout >= 100) {
 853                 netdev_warn(dev->net, "timeout on PHY Reset");
 854                 return -EIO;
 855         }
 856
 857         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_ADVERTISE,
 858                 ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP |
 859                 ADVERTISE_PAUSE_ASYM);
 860
 861         /* read to clear */
 862         ret = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, PHY_INT_SRC);
 863         if (ret < 0) {
 864                 netdev_warn(dev->net, "Failed to read PHY_INT_SRC during init\n");
 865                 return ret;
 866         }
 867
 868         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, PHY_INT_MASK,
 869                 PHY_INT_MASK_DEFAULT_);
 870         mii_nway_restart(&dev->mii);
 871
 872         netif_dbg(dev, ifup, dev->net, "phy initialised successfully\n");
 873         return 0;
 874 }
 875
 876 static int smsc95xx_reset(struct usbnet *dev)
 877 {
 878         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 879         u32 read_buf, write_buf, burst_cap;
 880         int ret = 0, timeout;
 881
 882         netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
 883
 884         ret = smsc95xx_write_reg(dev, HW_CFG, HW_CFG_LRST_);
 885         if (ret < 0)
 886                 return ret;
 887
 888         timeout = 0;
 889         do {
 890                 msleep(10);
 891                 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 892                 if (ret < 0)
 893                         return ret;
 894                 timeout++;
 895         } while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
 896
 897         if (timeout >= 100) {
 898                 netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
 899                 return ret;
 900         }
 901
 902         ret = smsc95xx_write_reg(dev, PM_CTRL, PM_CTL_PHY_RST_);
 903         if (ret < 0)
 904                 return ret;
 905
 906         timeout = 0;
 907         do {
 908                 msleep(10);
 909                 ret = smsc95xx_read_reg(dev, PM_CTRL, &read_buf);
 910                 if (ret < 0)
 911                         return ret;
 912                 timeout++;
 913         } while ((read_buf & PM_CTL_PHY_RST_) && (timeout < 100));
 914
 915         if (timeout >= 100) {
 916                 netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
 917                 return ret;
 918         }
 919
 920         ret = smsc95xx_set_mac_address(dev);
 921         if (ret < 0)
 922                 return ret;
 923
 924         netif_dbg(dev, ifup, dev->net, "MAC Address: %pM\n",
 925                   dev->net->dev_addr);
 926
 927         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 928         if (ret < 0)
 929                 return ret;
 930
 931         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x\n",
 932                   read_buf);
 933
 934         read_buf |= HW_CFG_BIR_;
 935
 936         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 937         if (ret < 0)
 938                 return ret;
 939
 940         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 941         if (ret < 0)
 942                 return ret;
 943
 944         netif_dbg(dev, ifup, dev->net,
 945                   "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
 946                   read_buf);
 947
 948         if (!turbo_mode) {
 949                 burst_cap = 0;
 950                 dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
 951         } else if (dev->udev->speed == USB_SPEED_HIGH) {
 952                 burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
 953                 dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
 954         } else {
 955                 burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
 956                 dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
 957         }
 958
 959         netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld\n",
 960                   (ulong)dev->rx_urb_size);
 961
 962         ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
 963         if (ret < 0)
 964                 return ret;
 965
 966         ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
 967         if (ret < 0)
 968                 return ret;
 969
 970         netif_dbg(dev, ifup, dev->net,
 971                   "Read Value from BURST_CAP after writing: 0x%08x\n",
 972                   read_buf);
 973
 974         ret = smsc95xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
 975         if (ret < 0)
 976                 return ret;
 977
 978         ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
 979         if (ret < 0)
 980                 return ret;
 981
 982         netif_dbg(dev, ifup, dev->net,
 983                   "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
 984                   read_buf);
 985
 986         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 987         if (ret < 0)
 988                 return ret;
 989
 990         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG: 0x%08x\n",
 991                   read_buf);
 992
 993         if (turbo_mode)
 994                 read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
 995
 996         read_buf &= ~HW_CFG_RXDOFF_;
 997
 998         /* set Rx data offset=2, Make IP header aligns on word boundary. */
 999         read_buf |= NET_IP_ALIGN << 9;
1000
1001         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
1002         if (ret < 0)
1003                 return ret;
1004
1005         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
1006         if (ret < 0)
1007                 return ret;
1008
1009         netif_dbg(dev, ifup, dev->net,
1010                   "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
1011
1012         ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
1013         if (ret < 0)
1014                 return ret;
1015
1016         ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
1017         if (ret < 0)
1018                 return ret;
1019         netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
1020
1021         /* Configure GPIO pins as LED outputs */
1022         write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
1023                 LED_GPIO_CFG_FDX_LED;
1024         ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
1025         if (ret < 0)
1026                 return ret;
1027
1028         /* Init Tx */
1029         ret = smsc95xx_write_reg(dev, FLOW, 0);
1030         if (ret < 0)
1031                 return ret;
1032
1033         ret = smsc95xx_write_reg(dev, AFC_CFG, AFC_CFG_DEFAULT);
1034         if (ret < 0)
1035                 return ret;
1036
1037         /* Don't need mac_cr_lock during initialisation */
1038         ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
1039         if (ret < 0)
1040                 return ret;
1041
1042         /* Init Rx */
1043         /* Set Vlan */
1044         ret = smsc95xx_write_reg(dev, VLAN1, (u32)ETH_P_8021Q);
1045         if (ret < 0)
1046                 return ret;
1047
1048         /* Enable or disable checksum offload engines */
1049         ret = smsc95xx_set_features(dev->net, dev->net->features);
1050         if (ret < 0) {
1051                 netdev_warn(dev->net, "Failed to set checksum offload features\n");
1052                 return ret;
1053         }
1054
1055         smsc95xx_set_multicast(dev->net);
1056
1057         ret = smsc95xx_phy_initialize(dev);
1058         if (ret < 0) {
1059                 netdev_warn(dev->net, "Failed to init PHY\n");
1060                 return ret;
1061         }
1062
1063         ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
1064         if (ret < 0)
1065                 return ret;
1066
1067         /* enable PHY interrupts */
1068         read_buf |= INT_EP_CTL_PHY_INT_;
1069
1070         ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
1071         if (ret < 0)
1072                 return ret;
1073
1074         ret = smsc95xx_start_tx_path(dev);
1075         if (ret < 0) {
1076                 netdev_warn(dev->net, "Failed to start TX path\n");
1077                 return ret;
1078         }
1079
1080         ret = smsc95xx_start_rx_path(dev, 0);
1081         if (ret < 0) {
1082                 netdev_warn(dev->net, "Failed to start RX path\n");
1083                 return ret;
1084         }
1085
1086         netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1087         return 0;
1088 }
1089
1090 static const struct net_device_ops smsc95xx_netdev_ops = {
1091         .ndo_open               = usbnet_open,
1092         .ndo_stop               = usbnet_stop,
1093         .ndo_start_xmit         = usbnet_start_xmit,
1094         .ndo_tx_timeout         = usbnet_tx_timeout,
1095         .ndo_change_mtu         = usbnet_change_mtu,
1096         .ndo_set_mac_address    = eth_mac_addr,
1097         .ndo_validate_addr      = eth_validate_addr,
1098         .ndo_do_ioctl           = smsc95xx_ioctl,
1099         .ndo_set_rx_mode        = smsc95xx_set_multicast,
1100         .ndo_set_features       = smsc95xx_set_features,
1101 };
1102
1103 static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1104 {
1105         struct smsc95xx_priv *pdata = NULL;
1106         u32 val;
1107         int ret;
1108
1109         printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1110
1111         ret = usbnet_get_endpoints(dev, intf);
1112         if (ret < 0) {
1113                 netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1114                 return ret;
1115         }
1116
1117         dev->data[0] = (unsigned long)kzalloc(sizeof(struct smsc95xx_priv),
1118                                               GFP_KERNEL);
1119
1120         pdata = (struct smsc95xx_priv *)(dev->data[0]);
1121         if (!pdata)
1122                 return -ENOMEM;
1123
1124         spin_lock_init(&pdata->mac_cr_lock);
1125
1126         if (DEFAULT_TX_CSUM_ENABLE)
1127                 dev->net->features |= NETIF_F_HW_CSUM;
1128         if (DEFAULT_RX_CSUM_ENABLE)
1129                 dev->net->features |= NETIF_F_RXCSUM;
1130
1131         dev->net->hw_features = NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1132
1133         smsc95xx_init_mac_address(dev);
1134
1135         /* Init all registers */
1136         ret = smsc95xx_reset(dev);
1137
1138         /* detect device revision as different features may be available */
1139         ret = smsc95xx_read_reg(dev, ID_REV, &val);
1140         if (ret < 0)
1141                 return ret;
1142         val >>= 16;
1143
1144         if ((val == ID_REV_CHIP_ID_9500A_) || (val == ID_REV_CHIP_ID_9530_) ||
1145             (val == ID_REV_CHIP_ID_89530_) || (val == ID_REV_CHIP_ID_9730_))
1146                 pdata->features = (FEATURE_8_WAKEUP_FILTERS |
1147                         FEATURE_PHY_NLP_CROSSOVER |
1148                         FEATURE_REMOTE_WAKEUP);
1149         else if (val == ID_REV_CHIP_ID_9512_)
1150                 pdata->features = FEATURE_8_WAKEUP_FILTERS;
1151
1152         dev->net->netdev_ops = &smsc95xx_netdev_ops;
1153         dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1154         dev->net->flags |= IFF_MULTICAST;
1155         dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
1156         dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
1157         return 0;
1158 }
1159
1160 static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1161 {
1162         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1163         if (pdata) {
1164                 netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1165                 kfree(pdata);
1166                 pdata = NULL;
1167                 dev->data[0] = 0;
1168         }
1169 }
1170
1171 static u32 smsc_crc(const u8 *buffer, size_t len, int filter)
1172 {
1173         u32 crc = bitrev16(crc16(0xFFFF, buffer, len));
1174         return crc << ((filter % 2) * 16);
1175 }
1176
1177 static int smsc95xx_enable_phy_wakeup_interrupts(struct usbnet *dev, u16 mask)
1178 {
1179         struct mii_if_info *mii = &dev->mii;
1180         int ret;
1181
1182         netdev_dbg(dev->net, "enabling PHY wakeup interrupts\n");
1183
1184         /* read to clear */
1185         ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, PHY_INT_SRC);
1186         if (ret < 0)
1187                 return ret;
1188
1189         /* enable interrupt source */
1190         ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, PHY_INT_MASK);
1191         if (ret < 0)
1192                 return ret;
1193
1194         ret |= mask;
1195
1196         smsc95xx_mdio_write_nopm(dev->net, mii->phy_id, PHY_INT_MASK, ret);
1197
1198         return 0;
1199 }
1200
1201 static int smsc95xx_link_ok_nopm(struct usbnet *dev)
1202 {
1203         struct mii_if_info *mii = &dev->mii;
1204         int ret;
1205
1206         /* first, a dummy read, needed to latch some MII phys */
1207         ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, MII_BMSR);
1208         if (ret < 0)
1209                 return ret;
1210
1211         ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, MII_BMSR);
1212         if (ret < 0)
1213                 return ret;
1214
1215         return !!(ret & BMSR_LSTATUS);
1216 }
1217
1218 static int smsc95xx_enter_suspend0(struct usbnet *dev)
1219 {
1220         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1221         u32 val;
1222         int ret;
1223
1224         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1225         if (ret < 0)
1226                 return ret;
1227
1228         val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
1229         val |= PM_CTL_SUS_MODE_0;
1230
1231         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1232         if (ret < 0)
1233                 return ret;
1234
1235         /* clear wol status */
1236         val &= ~PM_CTL_WUPS_;
1237         val |= PM_CTL_WUPS_WOL_;
1238
1239         /* enable energy detection */
1240         if (pdata->wolopts & WAKE_PHY)
1241                 val |= PM_CTL_WUPS_ED_;
1242
1243         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1244         if (ret < 0)
1245                 return ret;
1246
1247         /* read back PM_CTRL */
1248         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1249         if (ret < 0)
1250                 return ret;
1251
1252         pdata->suspend_flags |= SUSPEND_SUSPEND0;
1253
1254         return 0;
1255 }
1256
1257 static int smsc95xx_enter_suspend1(struct usbnet *dev)
1258 {
1259         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1260         struct mii_if_info *mii = &dev->mii;
1261         u32 val;
1262         int ret;
1263
1264         /* reconfigure link pulse detection timing for
1265          * compatibility with non-standard link partners
1266          */
1267         if (pdata->features & FEATURE_PHY_NLP_CROSSOVER)
1268                 smsc95xx_mdio_write_nopm(dev->net, mii->phy_id, PHY_EDPD_CONFIG,
1269                         PHY_EDPD_CONFIG_DEFAULT);
1270
1271         /* enable energy detect power-down mode */
1272         ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, PHY_MODE_CTRL_STS);
1273         if (ret < 0)
1274                 return ret;
1275
1276         ret |= MODE_CTRL_STS_EDPWRDOWN_;
1277
1278         smsc95xx_mdio_write_nopm(dev->net, mii->phy_id, PHY_MODE_CTRL_STS, ret);
1279
1280         /* enter SUSPEND1 mode */
1281         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1282         if (ret < 0)
1283                 return ret;
1284
1285         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1286         val |= PM_CTL_SUS_MODE_1;
1287
1288         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1289         if (ret < 0)
1290                 return ret;
1291
1292         /* clear wol status, enable energy detection */
1293         val &= ~PM_CTL_WUPS_;
1294         val |= (PM_CTL_WUPS_ED_ | PM_CTL_ED_EN_);
1295
1296         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1297         if (ret < 0)
1298                 return ret;
1299
1300         pdata->suspend_flags |= SUSPEND_SUSPEND1;
1301
1302         return 0;
1303 }
1304
1305 static int smsc95xx_enter_suspend2(struct usbnet *dev)
1306 {
1307         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1308         u32 val;
1309         int ret;
1310
1311         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1312         if (ret < 0)
1313                 return ret;
1314
1315         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1316         val |= PM_CTL_SUS_MODE_2;
1317
1318         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1319         if (ret < 0)
1320                 return ret;
1321
1322         pdata->suspend_flags |= SUSPEND_SUSPEND2;
1323
1324         return 0;
1325 }
1326
1327 static int smsc95xx_enter_suspend3(struct usbnet *dev)
1328 {
1329         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1330         u32 val;
1331         int ret;
1332
1333         ret = smsc95xx_read_reg_nopm(dev, RX_FIFO_INF, &val);
1334         if (ret < 0)
1335                 return ret;
1336
1337         if (val & 0xFFFF) {
1338                 netdev_info(dev->net, "rx fifo not empty in autosuspend\n");
1339                 return -EBUSY;
1340         }
1341
1342         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1343         if (ret < 0)
1344                 return ret;
1345
1346         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1347         val |= PM_CTL_SUS_MODE_3 | PM_CTL_RES_CLR_WKP_STS;
1348
1349         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1350         if (ret < 0)
1351                 return ret;
1352
1353         /* clear wol status */
1354         val &= ~PM_CTL_WUPS_;
1355         val |= PM_CTL_WUPS_WOL_;
1356
1357         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1358         if (ret < 0)
1359                 return ret;
1360
1361         pdata->suspend_flags |= SUSPEND_SUSPEND3;
1362
1363         return 0;
1364 }
1365
1366 static int smsc95xx_autosuspend(struct usbnet *dev, u32 link_up)
1367 {
1368         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1369         int ret;
1370
1371         if (!netif_running(dev->net)) {
1372                 /* interface is ifconfig down so fully power down hw */
1373                 netdev_dbg(dev->net, "autosuspend entering SUSPEND2\n");
1374                 return smsc95xx_enter_suspend2(dev);
1375         }
1376
1377         if (!link_up) {
1378                 /* link is down so enter EDPD mode, but only if device can
1379                  * reliably resume from it.  This check should be redundant
1380                  * as current FEATURE_REMOTE_WAKEUP parts also support
1381                  * FEATURE_PHY_NLP_CROSSOVER but it's included for clarity */
1382                 if (!(pdata->features & FEATURE_PHY_NLP_CROSSOVER)) {
1383                         netdev_warn(dev->net, "EDPD not supported\n");
1384                         return -EBUSY;
1385                 }
1386
1387                 netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n");
1388
1389                 /* enable PHY wakeup events for if cable is attached */
1390                 ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1391                         PHY_INT_MASK_ANEG_COMP_);
1392                 if (ret < 0) {
1393                         netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1394                         return ret;
1395                 }
1396
1397                 netdev_info(dev->net, "entering SUSPEND1 mode\n");
1398                 return smsc95xx_enter_suspend1(dev);
1399         }
1400
1401         /* enable PHY wakeup events so we remote wakeup if cable is pulled */
1402         ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1403                 PHY_INT_MASK_LINK_DOWN_);
1404         if (ret < 0) {
1405                 netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1406                 return ret;
1407         }
1408
1409         netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n");
1410         return smsc95xx_enter_suspend3(dev);
1411 }
1412
1413 static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
1414 {
1415         struct usbnet *dev = usb_get_intfdata(intf);
1416         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1417         u32 val, link_up;
1418         int ret;
1419
1420         ret = usbnet_suspend(intf, message);
1421         if (ret < 0) {
1422                 netdev_warn(dev->net, "usbnet_suspend error\n");
1423                 return ret;
1424         }
1425
1426         if (pdata->suspend_flags) {
1427                 netdev_warn(dev->net, "error during last resume\n");
1428                 pdata->suspend_flags = 0;
1429         }
1430
1431         /* determine if link is up using only _nopm functions */
1432         link_up = smsc95xx_link_ok_nopm(dev);
1433
1434         if (message.event == PM_EVENT_AUTO_SUSPEND &&
1435             (pdata->features & FEATURE_REMOTE_WAKEUP)) {
1436                 ret = smsc95xx_autosuspend(dev, link_up);
1437                 goto done;
1438         }
1439
1440         /* if we get this far we're not autosuspending */
1441         /* if no wol options set, or if link is down and we're not waking on
1442          * PHY activity, enter lowest power SUSPEND2 mode
1443          */
1444         if (!(pdata->wolopts & SUPPORTED_WAKE) ||
1445                 !(link_up || (pdata->wolopts & WAKE_PHY))) {
1446                 netdev_info(dev->net, "entering SUSPEND2 mode\n");
1447
1448                 /* disable energy detect (link up) & wake up events */
1449                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1450                 if (ret < 0)
1451                         goto done;
1452
1453                 val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
1454
1455                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1456                 if (ret < 0)
1457                         goto done;
1458
1459                 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1460                 if (ret < 0)
1461                         goto done;
1462
1463                 val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
1464
1465                 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1466                 if (ret < 0)
1467                         goto done;
1468
1469                 ret = smsc95xx_enter_suspend2(dev);
1470                 goto done;
1471         }
1472
1473         if (pdata->wolopts & WAKE_PHY) {
1474                 ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1475                         (PHY_INT_MASK_ANEG_COMP_ | PHY_INT_MASK_LINK_DOWN_));
1476                 if (ret < 0) {
1477                         netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1478                         goto done;
1479                 }
1480
1481                 /* if link is down then configure EDPD and enter SUSPEND1,
1482                  * otherwise enter SUSPEND0 below
1483                  */
1484                 if (!link_up) {
1485                         netdev_info(dev->net, "entering SUSPEND1 mode\n");
1486                         ret = smsc95xx_enter_suspend1(dev);
1487                         goto done;
1488                 }
1489         }
1490
1491         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1492                 u32 *filter_mask = kzalloc(sizeof(u32) * 32, GFP_KERNEL);
1493                 u32 command[2];
1494                 u32 offset[2];
1495                 u32 crc[4];
1496                 int wuff_filter_count =
1497                         (pdata->features & FEATURE_8_WAKEUP_FILTERS) ?
1498                         LAN9500A_WUFF_NUM : LAN9500_WUFF_NUM;
1499                 int i, filter = 0;
1500
1501                 if (!filter_mask) {
1502                         netdev_warn(dev->net, "Unable to allocate filter_mask\n");
1503                         ret = -ENOMEM;
1504                         goto done;
1505                 }
1506
1507                 memset(command, 0, sizeof(command));
1508                 memset(offset, 0, sizeof(offset));
1509                 memset(crc, 0, sizeof(crc));
1510
1511                 if (pdata->wolopts & WAKE_BCAST) {
1512                         const u8 bcast[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
1513                         netdev_info(dev->net, "enabling broadcast detection\n");
1514                         filter_mask[filter * 4] = 0x003F;
1515                         filter_mask[filter * 4 + 1] = 0x00;
1516                         filter_mask[filter * 4 + 2] = 0x00;
1517                         filter_mask[filter * 4 + 3] = 0x00;
1518                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1519                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1520                         crc[filter/2] |= smsc_crc(bcast, 6, filter);
1521                         filter++;
1522                 }
1523
1524                 if (pdata->wolopts & WAKE_MCAST) {
1525                         const u8 mcast[] = {0x01, 0x00, 0x5E};
1526                         netdev_info(dev->net, "enabling multicast detection\n");
1527                         filter_mask[filter * 4] = 0x0007;
1528                         filter_mask[filter * 4 + 1] = 0x00;
1529                         filter_mask[filter * 4 + 2] = 0x00;
1530                         filter_mask[filter * 4 + 3] = 0x00;
1531                         command[filter/4] |= 0x09UL << ((filter % 4) * 8);
1532                         offset[filter/4] |= 0x00  << ((filter % 4) * 8);
1533                         crc[filter/2] |= smsc_crc(mcast, 3, filter);
1534                         filter++;
1535                 }
1536
1537                 if (pdata->wolopts & WAKE_ARP) {
1538                         const u8 arp[] = {0x08, 0x06};
1539                         netdev_info(dev->net, "enabling ARP detection\n");
1540                         filter_mask[filter * 4] = 0x0003;
1541                         filter_mask[filter * 4 + 1] = 0x00;
1542                         filter_mask[filter * 4 + 2] = 0x00;
1543                         filter_mask[filter * 4 + 3] = 0x00;
1544                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1545                         offset[filter/4] |= 0x0C << ((filter % 4) * 8);
1546                         crc[filter/2] |= smsc_crc(arp, 2, filter);
1547                         filter++;
1548                 }
1549
1550                 if (pdata->wolopts & WAKE_UCAST) {
1551                         netdev_info(dev->net, "enabling unicast detection\n");
1552                         filter_mask[filter * 4] = 0x003F;
1553                         filter_mask[filter * 4 + 1] = 0x00;
1554                         filter_mask[filter * 4 + 2] = 0x00;
1555                         filter_mask[filter * 4 + 3] = 0x00;
1556                         command[filter/4] |= 0x01UL << ((filter % 4) * 8);
1557                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1558                         crc[filter/2] |= smsc_crc(dev->net->dev_addr, ETH_ALEN, filter);
1559                         filter++;
1560                 }
1561
1562                 for (i = 0; i < (wuff_filter_count * 4); i++) {
1563                         ret = smsc95xx_write_reg_nopm(dev, WUFF, filter_mask[i]);
1564                         if (ret < 0) {
1565                                 kfree(filter_mask);
1566                                 goto done;
1567                         }
1568                 }
1569                 kfree(filter_mask);
1570
1571                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1572                         ret = smsc95xx_write_reg_nopm(dev, WUFF, command[i]);
1573                         if (ret < 0)
1574                                 goto done;
1575                 }
1576
1577                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1578                         ret = smsc95xx_write_reg_nopm(dev, WUFF, offset[i]);
1579                         if (ret < 0)
1580                                 goto done;
1581                 }
1582
1583                 for (i = 0; i < (wuff_filter_count / 2); i++) {
1584                         ret = smsc95xx_write_reg_nopm(dev, WUFF, crc[i]);
1585                         if (ret < 0)
1586                                 goto done;
1587                 }
1588
1589                 /* clear any pending pattern match packet status */
1590                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1591                 if (ret < 0)
1592                         goto done;
1593
1594                 val |= WUCSR_WUFR_;
1595
1596                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1597                 if (ret < 0)
1598                         goto done;
1599         }
1600
1601         if (pdata->wolopts & WAKE_MAGIC) {
1602                 /* clear any pending magic packet status */
1603                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1604                 if (ret < 0)
1605                         goto done;
1606
1607                 val |= WUCSR_MPR_;
1608
1609                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1610                 if (ret < 0)
1611                         goto done;
1612         }
1613
1614         /* enable/disable wakeup sources */
1615         ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1616         if (ret < 0)
1617                 goto done;
1618
1619         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1620                 netdev_info(dev->net, "enabling pattern match wakeup\n");
1621                 val |= WUCSR_WAKE_EN_;
1622         } else {
1623                 netdev_info(dev->net, "disabling pattern match wakeup\n");
1624                 val &= ~WUCSR_WAKE_EN_;
1625         }
1626
1627         if (pdata->wolopts & WAKE_MAGIC) {
1628                 netdev_info(dev->net, "enabling magic packet wakeup\n");
1629                 val |= WUCSR_MPEN_;
1630         } else {
1631                 netdev_info(dev->net, "disabling magic packet wakeup\n");
1632                 val &= ~WUCSR_MPEN_;
1633         }
1634
1635         ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1636         if (ret < 0)
1637                 goto done;
1638
1639         /* enable wol wakeup source */
1640         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1641         if (ret < 0)
1642                 goto done;
1643
1644         val |= PM_CTL_WOL_EN_;
1645
1646         /* phy energy detect wakeup source */
1647         if (pdata->wolopts & WAKE_PHY)
1648                 val |= PM_CTL_ED_EN_;
1649
1650         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1651         if (ret < 0)
1652                 goto done;
1653
1654         /* enable receiver to enable frame reception */
1655         smsc95xx_start_rx_path(dev, 1);
1656
1657         /* some wol options are enabled, so enter SUSPEND0 */
1658         netdev_info(dev->net, "entering SUSPEND0 mode\n");
1659         ret = smsc95xx_enter_suspend0(dev);
1660
1661 done:
1662         /*
1663          * TODO: resume() might need to handle the suspend failure
1664          * in system sleep
1665          */
1666         if (ret && PMSG_IS_AUTO(message))
1667                 usbnet_resume(intf);
1668         return ret;
1669 }
1670
1671 static int smsc95xx_resume(struct usb_interface *intf)
1672 {
1673         struct usbnet *dev = usb_get_intfdata(intf);
1674         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1675         u8 suspend_flags = pdata->suspend_flags;
1676         int ret;
1677         u32 val;
1678
1679         BUG_ON(!dev);
1680
1681         netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags);
1682
1683         /* do this first to ensure it's cleared even in error case */
1684         pdata->suspend_flags = 0;
1685
1686         if (suspend_flags & SUSPEND_ALLMODES) {
1687                 /* clear wake-up sources */
1688                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1689                 if (ret < 0)
1690                         return ret;
1691
1692                 val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
1693
1694                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1695                 if (ret < 0)
1696                         return ret;
1697
1698                 /* clear wake-up status */
1699                 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1700                 if (ret < 0)
1701                         return ret;
1702
1703                 val &= ~PM_CTL_WOL_EN_;
1704                 val |= PM_CTL_WUPS_;
1705
1706                 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1707                 if (ret < 0)
1708                         return ret;
1709         }
1710
1711         ret = usbnet_resume(intf);
1712         if (ret < 0)
1713                 netdev_warn(dev->net, "usbnet_resume error\n");
1714
1715         return ret;
1716 }
1717
1718 static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1719 {
1720         skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
1721         skb->ip_summed = CHECKSUM_COMPLETE;
1722         skb_trim(skb, skb->len - 2);
1723 }
1724
1725 static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1726 {
1727         while (skb->len > 0) {
1728                 u32 header, align_count;
1729                 struct sk_buff *ax_skb;
1730                 unsigned char *packet;
1731                 u16 size;
1732
1733                 memcpy(&header, skb->data, sizeof(header));
1734                 le32_to_cpus(&header);
1735                 skb_pull(skb, 4 + NET_IP_ALIGN);
1736                 packet = skb->data;
1737
1738                 /* get the packet length */
1739                 size = (u16)((header & RX_STS_FL_) >> 16);
1740                 align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1741
1742                 if (unlikely(header & RX_STS_ES_)) {
1743                         netif_dbg(dev, rx_err, dev->net,
1744                                   "Error header=0x%08x\n", header);
1745                         dev->net->stats.rx_errors++;
1746                         dev->net->stats.rx_dropped++;
1747
1748                         if (header & RX_STS_CRC_) {
1749                                 dev->net->stats.rx_crc_errors++;
1750                         } else {
1751                                 if (header & (RX_STS_TL_ | RX_STS_RF_))
1752                                         dev->net->stats.rx_frame_errors++;
1753
1754                                 if ((header & RX_STS_LE_) &&
1755                                         (!(header & RX_STS_FT_)))
1756                                         dev->net->stats.rx_length_errors++;
1757                         }
1758                 } else {
1759                         /* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1760                         if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1761                                 netif_dbg(dev, rx_err, dev->net,
1762                                           "size err header=0x%08x\n", header);
1763                                 return 0;
1764                         }
1765
1766                         /* last frame in this batch */
1767                         if (skb->len == size) {
1768                                 if (dev->net->features & NETIF_F_RXCSUM)
1769                                         smsc95xx_rx_csum_offload(skb);
1770                                 skb_trim(skb, skb->len - 4); /* remove fcs */
1771                                 skb->truesize = size + sizeof(struct sk_buff);
1772
1773                                 return 1;
1774                         }
1775
1776                         ax_skb = skb_clone(skb, GFP_ATOMIC);
1777                         if (unlikely(!ax_skb)) {
1778                                 netdev_warn(dev->net, "Error allocating skb\n");
1779                                 return 0;
1780                         }
1781
1782                         ax_skb->len = size;
1783                         ax_skb->data = packet;
1784                         skb_set_tail_pointer(ax_skb, size);
1785
1786                         if (dev->net->features & NETIF_F_RXCSUM)
1787                                 smsc95xx_rx_csum_offload(ax_skb);
1788                         skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1789                         ax_skb->truesize = size + sizeof(struct sk_buff);
1790
1791                         usbnet_skb_return(dev, ax_skb);
1792                 }
1793
1794                 skb_pull(skb, size);
1795
1796                 /* padding bytes before the next frame starts */
1797                 if (skb->len)
1798                         skb_pull(skb, align_count);
1799         }
1800
1801         if (unlikely(skb->len < 0)) {
1802                 netdev_warn(dev->net, "invalid rx length<0 %d\n", skb->len);
1803                 return 0;
1804         }
1805
1806         return 1;
1807 }
1808
1809 static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1810 {
1811         u16 low_16 = (u16)skb_checksum_start_offset(skb);
1812         u16 high_16 = low_16 + skb->csum_offset;
1813         return (high_16 << 16) | low_16;
1814 }
1815
1816 static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1817                                          struct sk_buff *skb, gfp_t flags)
1818 {
1819         bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
1820         int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
1821         u32 tx_cmd_a, tx_cmd_b;
1822
1823         /* We do not advertise SG, so skbs should be already linearized */
1824         BUG_ON(skb_shinfo(skb)->nr_frags);
1825
1826         if (skb_headroom(skb) < overhead) {
1827                 struct sk_buff *skb2 = skb_copy_expand(skb,
1828                         overhead, 0, flags);
1829                 dev_kfree_skb_any(skb);
1830                 skb = skb2;
1831                 if (!skb)
1832                         return NULL;
1833         }
1834
1835         if (csum) {
1836                 if (skb->len <= 45) {
1837                         /* workaround - hardware tx checksum does not work
1838                          * properly with extremely small packets */
1839                         long csstart = skb_checksum_start_offset(skb);
1840                         __wsum calc = csum_partial(skb->data + csstart,
1841                                 skb->len - csstart, 0);
1842                         *((__sum16 *)(skb->data + csstart
1843                                 + skb->csum_offset)) = csum_fold(calc);
1844
1845                         csum = false;
1846                 } else {
1847                         u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
1848                         skb_push(skb, 4);
1849                         cpu_to_le32s(&csum_preamble);
1850                         memcpy(skb->data, &csum_preamble, 4);
1851                 }
1852         }
1853
1854         skb_push(skb, 4);
1855         tx_cmd_b = (u32)(skb->len - 4);
1856         if (csum)
1857                 tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
1858         cpu_to_le32s(&tx_cmd_b);
1859         memcpy(skb->data, &tx_cmd_b, 4);
1860
1861         skb_push(skb, 4);
1862         tx_cmd_a = (u32)(skb->len - 8) | TX_CMD_A_FIRST_SEG_ |
1863                 TX_CMD_A_LAST_SEG_;
1864         cpu_to_le32s(&tx_cmd_a);
1865         memcpy(skb->data, &tx_cmd_a, 4);
1866
1867         return skb;
1868 }
1869
1870 static int smsc95xx_manage_power(struct usbnet *dev, int on)
1871 {
1872         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1873
1874         dev->intf->needs_remote_wakeup = on;
1875
1876         if (pdata->features & FEATURE_REMOTE_WAKEUP)
1877                 return 0;
1878
1879         /* this chip revision isn't capable of remote wakeup */
1880         netdev_info(dev->net, "hardware isn't capable of remote wakeup\n");
1881
1882         if (on)
1883                 usb_autopm_get_interface_no_resume(dev->intf);
1884         else
1885                 usb_autopm_put_interface(dev->intf);
1886
1887         return 0;
1888 }
1889
1890 static const struct driver_info smsc95xx_info = {
1891         .description    = "smsc95xx USB 2.0 Ethernet",
1892         .bind           = smsc95xx_bind,
1893         .unbind         = smsc95xx_unbind,
1894         .link_reset     = smsc95xx_link_reset,
1895         .reset          = smsc95xx_reset,
1896         .rx_fixup       = smsc95xx_rx_fixup,
1897         .tx_fixup       = smsc95xx_tx_fixup,
1898         .status         = smsc95xx_status,
1899         .manage_power   = smsc95xx_manage_power,
1900         .flags          = FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
1901 };
1902
1903 static const struct usb_device_id products[] = {
1904         {
1905                 /* SMSC9500 USB Ethernet Device */
1906                 USB_DEVICE(0x0424, 0x9500),
1907                 .driver_info = (unsigned long) &smsc95xx_info,
1908         },
1909         {
1910                 /* SMSC9505 USB Ethernet Device */
1911                 USB_DEVICE(0x0424, 0x9505),
1912                 .driver_info = (unsigned long) &smsc95xx_info,
1913         },
1914         {
1915                 /* SMSC9500A USB Ethernet Device */
1916                 USB_DEVICE(0x0424, 0x9E00),
1917                 .driver_info = (unsigned long) &smsc95xx_info,
1918         },
1919         {
1920                 /* SMSC9505A USB Ethernet Device */
1921                 USB_DEVICE(0x0424, 0x9E01),
1922                 .driver_info = (unsigned long) &smsc95xx_info,
1923         },
1924         {
1925                 /* SMSC9512/9514 USB Hub & Ethernet Device */
1926                 USB_DEVICE(0x0424, 0xec00),
1927                 .driver_info = (unsigned long) &smsc95xx_info,
1928         },
1929         {
1930                 /* SMSC9500 USB Ethernet Device (SAL10) */
1931                 USB_DEVICE(0x0424, 0x9900),
1932                 .driver_info = (unsigned long) &smsc95xx_info,
1933         },
1934         {
1935                 /* SMSC9505 USB Ethernet Device (SAL10) */
1936                 USB_DEVICE(0x0424, 0x9901),
1937                 .driver_info = (unsigned long) &smsc95xx_info,
1938         },
1939         {
1940                 /* SMSC9500A USB Ethernet Device (SAL10) */
1941                 USB_DEVICE(0x0424, 0x9902),
1942                 .driver_info = (unsigned long) &smsc95xx_info,
1943         },
1944         {
1945                 /* SMSC9505A USB Ethernet Device (SAL10) */
1946                 USB_DEVICE(0x0424, 0x9903),
1947                 .driver_info = (unsigned long) &smsc95xx_info,
1948         },
1949         {
1950                 /* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
1951                 USB_DEVICE(0x0424, 0x9904),
1952                 .driver_info = (unsigned long) &smsc95xx_info,
1953         },
1954         {
1955                 /* SMSC9500A USB Ethernet Device (HAL) */
1956                 USB_DEVICE(0x0424, 0x9905),
1957                 .driver_info = (unsigned long) &smsc95xx_info,
1958         },
1959         {
1960                 /* SMSC9505A USB Ethernet Device (HAL) */
1961                 USB_DEVICE(0x0424, 0x9906),
1962                 .driver_info = (unsigned long) &smsc95xx_info,
1963         },
1964         {
1965                 /* SMSC9500 USB Ethernet Device (Alternate ID) */
1966                 USB_DEVICE(0x0424, 0x9907),
1967                 .driver_info = (unsigned long) &smsc95xx_info,
1968         },
1969         {
1970                 /* SMSC9500A USB Ethernet Device (Alternate ID) */
1971                 USB_DEVICE(0x0424, 0x9908),
1972                 .driver_info = (unsigned long) &smsc95xx_info,
1973         },
1974         {
1975                 /* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
1976                 USB_DEVICE(0x0424, 0x9909),
1977                 .driver_info = (unsigned long) &smsc95xx_info,
1978         },
1979         {
1980                 /* SMSC LAN9530 USB Ethernet Device */
1981                 USB_DEVICE(0x0424, 0x9530),
1982                 .driver_info = (unsigned long) &smsc95xx_info,
1983         },
1984         {
1985                 /* SMSC LAN9730 USB Ethernet Device */
1986                 USB_DEVICE(0x0424, 0x9730),
1987                 .driver_info = (unsigned long) &smsc95xx_info,
1988         },
1989         {
1990                 /* SMSC LAN89530 USB Ethernet Device */
1991                 USB_DEVICE(0x0424, 0x9E08),
1992                 .driver_info = (unsigned long) &smsc95xx_info,
1993         },
1994         { },            /* END */
1995 };
1996 MODULE_DEVICE_TABLE(usb, products);
1997
1998 static struct usb_driver smsc95xx_driver = {
1999         .name           = "smsc95xx",
2000         .id_table       = products,
2001         .probe          = usbnet_probe,
2002         .suspend        = smsc95xx_suspend,
2003         .resume         = smsc95xx_resume,
2004         .reset_resume   = smsc95xx_resume,
2005         .disconnect     = usbnet_disconnect,
2006         .disable_hub_initiated_lpm = 1,
2007         .supports_autosuspend = 1,
2008 };
2009
2010 module_usb_driver(smsc95xx_driver);
2011
2012 MODULE_AUTHOR("Nancy Lin");
2013 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
2014 MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
2015 MODULE_LICENSE("GPL");