drivers/net/usb/smsc95xx.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2  /***************************************************************************
   3  *
   4  * Copyright (C) 2007-2008 SMSC
   5  *
   6  *****************************************************************************/
   7
   8 #include <linux/module.h>
   9 #include <linux/kmod.h>
  10 #include <linux/netdevice.h>
  11 #include <linux/etherdevice.h>
  12 #include <linux/ethtool.h>
  13 #include <linux/mii.h>
  14 #include <linux/usb.h>
  15 #include <linux/bitrev.h>
  16 #include <linux/crc16.h>
  17 #include <linux/crc32.h>
  18 #include <linux/usb/usbnet.h>
  19 #include <linux/slab.h>
  20 #include <linux/of_net.h>
  21 #include <linux/mdio.h>
  22 #include <linux/phy.h>
  23 #include "smsc95xx.h"
  24
  25 #define SMSC_CHIPNAME                   "smsc95xx"
  26 #define SMSC_DRIVER_VERSION             "2.0.0"
  27 #define HS_USB_PKT_SIZE                 (512)
  28 #define FS_USB_PKT_SIZE                 (64)
  29 #define DEFAULT_HS_BURST_CAP_SIZE       (16 * 1024 + 5 * HS_USB_PKT_SIZE)
  30 #define DEFAULT_FS_BURST_CAP_SIZE       (6 * 1024 + 33 * FS_USB_PKT_SIZE)
  31 #define DEFAULT_BULK_IN_DELAY           (0x00002000)
  32 #define MAX_SINGLE_PACKET_SIZE          (2048)
  33 #define LAN95XX_EEPROM_MAGIC            (0x9500)
  34 #define EEPROM_MAC_OFFSET               (0x01)
  35 #define DEFAULT_TX_CSUM_ENABLE          (true)
  36 #define DEFAULT_RX_CSUM_ENABLE          (true)
  37 #define SMSC95XX_INTERNAL_PHY_ID        (1)
  38 #define SMSC95XX_TX_OVERHEAD            (8)
  39 #define SMSC95XX_TX_OVERHEAD_CSUM       (12)
  40 #define SUPPORTED_WAKE                  (WAKE_PHY | WAKE_UCAST | WAKE_BCAST | \
  41                                          WAKE_MCAST | WAKE_ARP | WAKE_MAGIC)
  42
  43 #define FEATURE_8_WAKEUP_FILTERS        (0x01)
  44 #define FEATURE_PHY_NLP_CROSSOVER       (0x02)
  45 #define FEATURE_REMOTE_WAKEUP           (0x04)
  46
  47 #define SUSPEND_SUSPEND0                (0x01)
  48 #define SUSPEND_SUSPEND1                (0x02)
  49 #define SUSPEND_SUSPEND2                (0x04)
  50 #define SUSPEND_SUSPEND3                (0x08)
  51 #define SUSPEND_ALLMODES                (SUSPEND_SUSPEND0 | SUSPEND_SUSPEND1 | \
  52                                          SUSPEND_SUSPEND2 | SUSPEND_SUSPEND3)
  53
  54 struct smsc95xx_priv {
  55         u32 mac_cr;
  56         u32 hash_hi;
  57         u32 hash_lo;
  58         u32 wolopts;
  59         spinlock_t mac_cr_lock;
  60         u8 features;
  61         u8 suspend_flags;
  62         struct mii_bus *mdiobus;
  63         struct phy_device *phydev;
  64 };
  65
  66 static bool turbo_mode = true;
  67 module_param(turbo_mode, bool, 0644);
  68 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
  69
  70 static int __must_check __smsc95xx_read_reg(struct usbnet *dev, u32 index,
  71                                             u32 *data, int in_pm)
  72 {
  73         u32 buf;
  74         int ret;
  75         int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
  76
  77         BUG_ON(!dev);
  78
  79         if (!in_pm)
  80                 fn = usbnet_read_cmd;
  81         else
  82                 fn = usbnet_read_cmd_nopm;
  83
  84         ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
  85                  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  86                  0, index, &buf, 4);
  87         if (unlikely(ret < 0)) {
  88                 netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d\n",
  89                             index, ret);
  90                 return ret;
  91         }
  92
  93         le32_to_cpus(&buf);
  94         *data = buf;
  95
  96         return ret;
  97 }
  98
  99 static int __must_check __smsc95xx_write_reg(struct usbnet *dev, u32 index,
 100                                              u32 data, int in_pm)
 101 {
 102         u32 buf;
 103         int ret;
 104         int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
 105
 106         BUG_ON(!dev);
 107
 108         if (!in_pm)
 109                 fn = usbnet_write_cmd;
 110         else
 111                 fn = usbnet_write_cmd_nopm;
 112
 113         buf = data;
 114         cpu_to_le32s(&buf);
 115
 116         ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
 117                  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 118                  0, index, &buf, 4);
 119         if (unlikely(ret < 0))
 120                 netdev_warn(dev->net, "Failed to write reg index 0x%08x: %d\n",
 121                             index, ret);
 122
 123         return ret;
 124 }
 125
 126 static int __must_check smsc95xx_read_reg_nopm(struct usbnet *dev, u32 index,
 127                                                u32 *data)
 128 {
 129         return __smsc95xx_read_reg(dev, index, data, 1);
 130 }
 131
 132 static int __must_check smsc95xx_write_reg_nopm(struct usbnet *dev, u32 index,
 133                                                 u32 data)
 134 {
 135         return __smsc95xx_write_reg(dev, index, data, 1);
 136 }
 137
 138 static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
 139                                           u32 *data)
 140 {
 141         return __smsc95xx_read_reg(dev, index, data, 0);
 142 }
 143
 144 static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
 145                                            u32 data)
 146 {
 147         return __smsc95xx_write_reg(dev, index, data, 0);
 148 }
 149
 150 /* Loop until the read is completed with timeout
 151  * called with phy_mutex held */
 152 static int __must_check __smsc95xx_phy_wait_not_busy(struct usbnet *dev,
 153                                                      int in_pm)
 154 {
 155         unsigned long start_time = jiffies;
 156         u32 val;
 157         int ret;
 158
 159         do {
 160                 ret = __smsc95xx_read_reg(dev, MII_ADDR, &val, in_pm);
 161                 if (ret < 0) {
 162                         netdev_warn(dev->net, "Error reading MII_ACCESS\n");
 163                         return ret;
 164                 }
 165
 166                 if (!(val & MII_BUSY_))
 167                         return 0;
 168         } while (!time_after(jiffies, start_time + HZ));
 169
 170         return -EIO;
 171 }
 172
 173 static u32 mii_address_cmd(int phy_id, int idx, u16 op)
 174 {
 175         return (phy_id & 0x1f) << 11 | (idx & 0x1f) << 6 | op;
 176 }
 177
 178 static int __smsc95xx_mdio_read(struct usbnet *dev, int phy_id, int idx,
 179                                 int in_pm)
 180 {
 181         u32 val, addr;
 182         int ret;
 183
 184         mutex_lock(&dev->phy_mutex);
 185
 186         /* confirm MII not busy */
 187         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 188         if (ret < 0) {
 189                 netdev_warn(dev->net, "%s: MII is busy\n", __func__);
 190                 goto done;
 191         }
 192
 193         /* set the address, index & direction (read from PHY) */
 194         addr = mii_address_cmd(phy_id, idx, MII_READ_ | MII_BUSY_);
 195         ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
 196         if (ret < 0) {
 197                 netdev_warn(dev->net, "Error writing MII_ADDR\n");
 198                 goto done;
 199         }
 200
 201         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 202         if (ret < 0) {
 203                 netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
 204                 goto done;
 205         }
 206
 207         ret = __smsc95xx_read_reg(dev, MII_DATA, &val, in_pm);
 208         if (ret < 0) {
 209                 netdev_warn(dev->net, "Error reading MII_DATA\n");
 210                 goto done;
 211         }
 212
 213         ret = (u16)(val & 0xFFFF);
 214
 215 done:
 216         mutex_unlock(&dev->phy_mutex);
 217         return ret;
 218 }
 219
 220 static void __smsc95xx_mdio_write(struct usbnet *dev, int phy_id,
 221                                   int idx, int regval, int in_pm)
 222 {
 223         u32 val, addr;
 224         int ret;
 225
 226         mutex_lock(&dev->phy_mutex);
 227
 228         /* confirm MII not busy */
 229         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 230         if (ret < 0) {
 231                 netdev_warn(dev->net, "%s: MII is busy\n", __func__);
 232                 goto done;
 233         }
 234
 235         val = regval;
 236         ret = __smsc95xx_write_reg(dev, MII_DATA, val, in_pm);
 237         if (ret < 0) {
 238                 netdev_warn(dev->net, "Error writing MII_DATA\n");
 239                 goto done;
 240         }
 241
 242         /* set the address, index & direction (write to PHY) */
 243         addr = mii_address_cmd(phy_id, idx, MII_WRITE_ | MII_BUSY_);
 244         ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
 245         if (ret < 0) {
 246                 netdev_warn(dev->net, "Error writing MII_ADDR\n");
 247                 goto done;
 248         }
 249
 250         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 251         if (ret < 0) {
 252                 netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
 253                 goto done;
 254         }
 255
 256 done:
 257         mutex_unlock(&dev->phy_mutex);
 258 }
 259
 260 static int smsc95xx_mdio_read_nopm(struct usbnet *dev, int idx)
 261 {
 262         struct smsc95xx_priv *pdata = dev->driver_priv;
 263
 264         return __smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, idx, 1);
 265 }
 266
 267 static void smsc95xx_mdio_write_nopm(struct usbnet *dev, int idx, int regval)
 268 {
 269         struct smsc95xx_priv *pdata = dev->driver_priv;
 270
 271         __smsc95xx_mdio_write(dev, pdata->phydev->mdio.addr, idx, regval, 1);
 272 }
 273
 274 static int smsc95xx_mdiobus_read(struct mii_bus *bus, int phy_id, int idx)
 275 {
 276         struct usbnet *dev = bus->priv;
 277
 278         return __smsc95xx_mdio_read(dev, phy_id, idx, 0);
 279 }
 280
 281 static int smsc95xx_mdiobus_write(struct mii_bus *bus, int phy_id, int idx,
 282                                   u16 regval)
 283 {
 284         struct usbnet *dev = bus->priv;
 285
 286         __smsc95xx_mdio_write(dev, phy_id, idx, regval, 0);
 287         return 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 = dev->driver_priv;
 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)
 518 {
 519         u32 flow = 0, afc_cfg;
 520         struct smsc95xx_priv *pdata = dev->driver_priv;
 521         bool tx_pause, rx_pause;
 522
 523         int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
 524         if (ret < 0)
 525                 return ret;
 526
 527         if (pdata->phydev->duplex == DUPLEX_FULL) {
 528                 phy_get_pause(pdata->phydev, &tx_pause, &rx_pause);
 529
 530                 if (rx_pause)
 531                         flow = 0xFFFF0002;
 532
 533                 if (tx_pause) {
 534                         afc_cfg |= 0xF;
 535                         flow |= 0xFFFF0000;
 536                 } else {
 537                         afc_cfg &= ~0xF;
 538                 }
 539
 540                 netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
 541                           rx_pause ? "enabled" : "disabled",
 542                           tx_pause ? "enabled" : "disabled");
 543         } else {
 544                 netif_dbg(dev, link, dev->net, "half duplex\n");
 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 = dev->driver_priv;
 558         unsigned long flags;
 559         int ret;
 560
 561         ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
 562         if (ret < 0)
 563                 return ret;
 564
 565         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 566         if (pdata->phydev->duplex != DUPLEX_FULL) {
 567                 pdata->mac_cr &= ~MAC_CR_FDPX_;
 568                 pdata->mac_cr |= MAC_CR_RCVOWN_;
 569         } else {
 570                 pdata->mac_cr &= ~MAC_CR_RCVOWN_;
 571                 pdata->mac_cr |= MAC_CR_FDPX_;
 572         }
 573         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 574
 575         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 576         if (ret < 0)
 577                 return ret;
 578
 579         ret = smsc95xx_phy_update_flowcontrol(dev);
 580         if (ret < 0)
 581                 netdev_warn(dev->net, "Error updating PHY flow control\n");
 582
 583         return ret;
 584 }
 585
 586 static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
 587 {
 588         u32 intdata;
 589
 590         if (urb->actual_length != 4) {
 591                 netdev_warn(dev->net, "unexpected urb length %d\n",
 592                             urb->actual_length);
 593                 return;
 594         }
 595
 596         intdata = get_unaligned_le32(urb->transfer_buffer);
 597         netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
 598
 599         if (intdata & INT_ENP_PHY_INT_)
 600                 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
 601         else
 602                 netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
 603                             intdata);
 604 }
 605
 606 /* Enable or disable Tx & Rx checksum offload engines */
 607 static int smsc95xx_set_features(struct net_device *netdev,
 608         netdev_features_t features)
 609 {
 610         struct usbnet *dev = netdev_priv(netdev);
 611         u32 read_buf;
 612         int ret;
 613
 614         ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
 615         if (ret < 0)
 616                 return ret;
 617
 618         if (features & NETIF_F_IP_CSUM)
 619                 read_buf |= Tx_COE_EN_;
 620         else
 621                 read_buf &= ~Tx_COE_EN_;
 622
 623         if (features & NETIF_F_RXCSUM)
 624                 read_buf |= Rx_COE_EN_;
 625         else
 626                 read_buf &= ~Rx_COE_EN_;
 627
 628         ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
 629         if (ret < 0)
 630                 return ret;
 631
 632         netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
 633         return 0;
 634 }
 635
 636 static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
 637 {
 638         return MAX_EEPROM_SIZE;
 639 }
 640
 641 static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
 642                                        struct ethtool_eeprom *ee, u8 *data)
 643 {
 644         struct usbnet *dev = netdev_priv(netdev);
 645
 646         ee->magic = LAN95XX_EEPROM_MAGIC;
 647
 648         return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
 649 }
 650
 651 static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
 652                                        struct ethtool_eeprom *ee, u8 *data)
 653 {
 654         struct usbnet *dev = netdev_priv(netdev);
 655
 656         if (ee->magic != LAN95XX_EEPROM_MAGIC) {
 657                 netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
 658                             ee->magic);
 659                 return -EINVAL;
 660         }
 661
 662         return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
 663 }
 664
 665 static int smsc95xx_ethtool_getregslen(struct net_device *netdev)
 666 {
 667         /* all smsc95xx registers */
 668         return COE_CR - ID_REV + sizeof(u32);
 669 }
 670
 671 static void
 672 smsc95xx_ethtool_getregs(struct net_device *netdev, struct ethtool_regs *regs,
 673                          void *buf)
 674 {
 675         struct usbnet *dev = netdev_priv(netdev);
 676         unsigned int i, j;
 677         int retval;
 678         u32 *data = buf;
 679
 680         retval = smsc95xx_read_reg(dev, ID_REV, &regs->version);
 681         if (retval < 0) {
 682                 netdev_warn(netdev, "REGS: cannot read ID_REV\n");
 683                 return;
 684         }
 685
 686         for (i = ID_REV, j = 0; i <= COE_CR; i += (sizeof(u32)), j++) {
 687                 retval = smsc95xx_read_reg(dev, i, &data[j]);
 688                 if (retval < 0) {
 689                         netdev_warn(netdev, "REGS: cannot read reg[%x]\n", i);
 690                         return;
 691                 }
 692         }
 693 }
 694
 695 static void smsc95xx_ethtool_get_wol(struct net_device *net,
 696                                      struct ethtool_wolinfo *wolinfo)
 697 {
 698         struct usbnet *dev = netdev_priv(net);
 699         struct smsc95xx_priv *pdata = dev->driver_priv;
 700
 701         wolinfo->supported = SUPPORTED_WAKE;
 702         wolinfo->wolopts = pdata->wolopts;
 703 }
 704
 705 static int smsc95xx_ethtool_set_wol(struct net_device *net,
 706                                     struct ethtool_wolinfo *wolinfo)
 707 {
 708         struct usbnet *dev = netdev_priv(net);
 709         struct smsc95xx_priv *pdata = dev->driver_priv;
 710         int ret;
 711
 712         if (wolinfo->wolopts & ~SUPPORTED_WAKE)
 713                 return -EINVAL;
 714
 715         pdata->wolopts = wolinfo->wolopts & SUPPORTED_WAKE;
 716
 717         ret = device_set_wakeup_enable(&dev->udev->dev, pdata->wolopts);
 718         if (ret < 0)
 719                 netdev_warn(dev->net, "device_set_wakeup_enable error %d\n", ret);
 720
 721         return ret;
 722 }
 723
 724 static u32 smsc95xx_get_link(struct net_device *net)
 725 {
 726         phy_read_status(net->phydev);
 727         return net->phydev->link;
 728 }
 729
 730 static const struct ethtool_ops smsc95xx_ethtool_ops = {
 731         .get_link       = smsc95xx_get_link,
 732         .nway_reset     = phy_ethtool_nway_reset,
 733         .get_drvinfo    = usbnet_get_drvinfo,
 734         .get_msglevel   = usbnet_get_msglevel,
 735         .set_msglevel   = usbnet_set_msglevel,
 736         .get_eeprom_len = smsc95xx_ethtool_get_eeprom_len,
 737         .get_eeprom     = smsc95xx_ethtool_get_eeprom,
 738         .set_eeprom     = smsc95xx_ethtool_set_eeprom,
 739         .get_regs_len   = smsc95xx_ethtool_getregslen,
 740         .get_regs       = smsc95xx_ethtool_getregs,
 741         .get_wol        = smsc95xx_ethtool_get_wol,
 742         .set_wol        = smsc95xx_ethtool_set_wol,
 743         .get_link_ksettings     = phy_ethtool_get_link_ksettings,
 744         .set_link_ksettings     = phy_ethtool_set_link_ksettings,
 745         .get_ts_info    = ethtool_op_get_ts_info,
 746 };
 747
 748 static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
 749 {
 750         if (!netif_running(netdev))
 751                 return -EINVAL;
 752
 753         return phy_mii_ioctl(netdev->phydev, rq, cmd);
 754 }
 755
 756 static void smsc95xx_init_mac_address(struct usbnet *dev)
 757 {
 758         const u8 *mac_addr;
 759
 760         /* maybe the boot loader passed the MAC address in devicetree */
 761         mac_addr = of_get_mac_address(dev->udev->dev.of_node);
 762         if (!IS_ERR(mac_addr)) {
 763                 ether_addr_copy(dev->net->dev_addr, mac_addr);
 764                 return;
 765         }
 766
 767         /* try reading mac address from EEPROM */
 768         if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
 769                         dev->net->dev_addr) == 0) {
 770                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 771                         /* eeprom values are valid so use them */
 772                         netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
 773                         return;
 774                 }
 775         }
 776
 777         /* no useful static MAC address found. generate a random one */
 778         eth_hw_addr_random(dev->net);
 779         netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
 780 }
 781
 782 static int smsc95xx_set_mac_address(struct usbnet *dev)
 783 {
 784         u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
 785                 dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
 786         u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
 787         int ret;
 788
 789         ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
 790         if (ret < 0)
 791                 return ret;
 792
 793         return smsc95xx_write_reg(dev, ADDRH, addr_hi);
 794 }
 795
 796 /* starts the TX path */
 797 static int smsc95xx_start_tx_path(struct usbnet *dev)
 798 {
 799         struct smsc95xx_priv *pdata = dev->driver_priv;
 800         unsigned long flags;
 801         int ret;
 802
 803         /* Enable Tx at MAC */
 804         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 805         pdata->mac_cr |= MAC_CR_TXEN_;
 806         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 807
 808         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 809         if (ret < 0)
 810                 return ret;
 811
 812         /* Enable Tx at SCSRs */
 813         return smsc95xx_write_reg(dev, TX_CFG, TX_CFG_ON_);
 814 }
 815
 816 /* Starts the Receive path */
 817 static int smsc95xx_start_rx_path(struct usbnet *dev, int in_pm)
 818 {
 819         struct smsc95xx_priv *pdata = dev->driver_priv;
 820         unsigned long flags;
 821
 822         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 823         pdata->mac_cr |= MAC_CR_RXEN_;
 824         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 825
 826         return __smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr, in_pm);
 827 }
 828
 829 static int smsc95xx_reset(struct usbnet *dev)
 830 {
 831         struct smsc95xx_priv *pdata = dev->driver_priv;
 832         u32 read_buf, write_buf, burst_cap;
 833         int ret = 0, timeout;
 834
 835         netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
 836
 837         ret = smsc95xx_write_reg(dev, HW_CFG, HW_CFG_LRST_);
 838         if (ret < 0)
 839                 return ret;
 840
 841         timeout = 0;
 842         do {
 843                 msleep(10);
 844                 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 845                 if (ret < 0)
 846                         return ret;
 847                 timeout++;
 848         } while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
 849
 850         if (timeout >= 100) {
 851                 netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
 852                 return ret;
 853         }
 854
 855         ret = smsc95xx_write_reg(dev, PM_CTRL, PM_CTL_PHY_RST_);
 856         if (ret < 0)
 857                 return ret;
 858
 859         timeout = 0;
 860         do {
 861                 msleep(10);
 862                 ret = smsc95xx_read_reg(dev, PM_CTRL, &read_buf);
 863                 if (ret < 0)
 864                         return ret;
 865                 timeout++;
 866         } while ((read_buf & PM_CTL_PHY_RST_) && (timeout < 100));
 867
 868         if (timeout >= 100) {
 869                 netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
 870                 return ret;
 871         }
 872
 873         ret = smsc95xx_set_mac_address(dev);
 874         if (ret < 0)
 875                 return ret;
 876
 877         netif_dbg(dev, ifup, dev->net, "MAC Address: %pM\n",
 878                   dev->net->dev_addr);
 879
 880         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 881         if (ret < 0)
 882                 return ret;
 883
 884         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x\n",
 885                   read_buf);
 886
 887         read_buf |= HW_CFG_BIR_;
 888
 889         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 890         if (ret < 0)
 891                 return ret;
 892
 893         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 894         if (ret < 0)
 895                 return ret;
 896
 897         netif_dbg(dev, ifup, dev->net,
 898                   "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
 899                   read_buf);
 900
 901         if (!turbo_mode) {
 902                 burst_cap = 0;
 903                 dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
 904         } else if (dev->udev->speed == USB_SPEED_HIGH) {
 905                 burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
 906                 dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
 907         } else {
 908                 burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
 909                 dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
 910         }
 911
 912         netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld\n",
 913                   (ulong)dev->rx_urb_size);
 914
 915         ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
 916         if (ret < 0)
 917                 return ret;
 918
 919         ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
 920         if (ret < 0)
 921                 return ret;
 922
 923         netif_dbg(dev, ifup, dev->net,
 924                   "Read Value from BURST_CAP after writing: 0x%08x\n",
 925                   read_buf);
 926
 927         ret = smsc95xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
 928         if (ret < 0)
 929                 return ret;
 930
 931         ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
 932         if (ret < 0)
 933                 return ret;
 934
 935         netif_dbg(dev, ifup, dev->net,
 936                   "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
 937                   read_buf);
 938
 939         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 940         if (ret < 0)
 941                 return ret;
 942
 943         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG: 0x%08x\n",
 944                   read_buf);
 945
 946         if (turbo_mode)
 947                 read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
 948
 949         read_buf &= ~HW_CFG_RXDOFF_;
 950
 951         /* set Rx data offset=2, Make IP header aligns on word boundary. */
 952         read_buf |= NET_IP_ALIGN << 9;
 953
 954         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 955         if (ret < 0)
 956                 return ret;
 957
 958         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 959         if (ret < 0)
 960                 return ret;
 961
 962         netif_dbg(dev, ifup, dev->net,
 963                   "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
 964
 965         ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
 966         if (ret < 0)
 967                 return ret;
 968
 969         ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
 970         if (ret < 0)
 971                 return ret;
 972         netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
 973
 974         /* Configure GPIO pins as LED outputs */
 975         write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
 976                 LED_GPIO_CFG_FDX_LED;
 977         ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
 978         if (ret < 0)
 979                 return ret;
 980
 981         /* Init Tx */
 982         ret = smsc95xx_write_reg(dev, FLOW, 0);
 983         if (ret < 0)
 984                 return ret;
 985
 986         ret = smsc95xx_write_reg(dev, AFC_CFG, AFC_CFG_DEFAULT);
 987         if (ret < 0)
 988                 return ret;
 989
 990         /* Don't need mac_cr_lock during initialisation */
 991         ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
 992         if (ret < 0)
 993                 return ret;
 994
 995         /* Init Rx */
 996         /* Set Vlan */
 997         ret = smsc95xx_write_reg(dev, VLAN1, (u32)ETH_P_8021Q);
 998         if (ret < 0)
 999                 return ret;
1000
1001         /* Enable or disable checksum offload engines */
1002         ret = smsc95xx_set_features(dev->net, dev->net->features);
1003         if (ret < 0) {
1004                 netdev_warn(dev->net, "Failed to set checksum offload features\n");
1005                 return ret;
1006         }
1007
1008         smsc95xx_set_multicast(dev->net);
1009
1010         ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
1011         if (ret < 0)
1012                 return ret;
1013
1014         /* enable PHY interrupts */
1015         read_buf |= INT_EP_CTL_PHY_INT_;
1016
1017         ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
1018         if (ret < 0)
1019                 return ret;
1020
1021         ret = smsc95xx_start_tx_path(dev);
1022         if (ret < 0) {
1023                 netdev_warn(dev->net, "Failed to start TX path\n");
1024                 return ret;
1025         }
1026
1027         ret = smsc95xx_start_rx_path(dev, 0);
1028         if (ret < 0) {
1029                 netdev_warn(dev->net, "Failed to start RX path\n");
1030                 return ret;
1031         }
1032
1033         netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1034         return 0;
1035 }
1036
1037 static const struct net_device_ops smsc95xx_netdev_ops = {
1038         .ndo_open               = usbnet_open,
1039         .ndo_stop               = usbnet_stop,
1040         .ndo_start_xmit         = usbnet_start_xmit,
1041         .ndo_tx_timeout         = usbnet_tx_timeout,
1042         .ndo_change_mtu         = usbnet_change_mtu,
1043         .ndo_get_stats64        = usbnet_get_stats64,
1044         .ndo_set_mac_address    = eth_mac_addr,
1045         .ndo_validate_addr      = eth_validate_addr,
1046         .ndo_do_ioctl           = smsc95xx_ioctl,
1047         .ndo_set_rx_mode        = smsc95xx_set_multicast,
1048         .ndo_set_features       = smsc95xx_set_features,
1049 };
1050
1051 static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1052 {
1053         struct smsc95xx_priv *pdata;
1054         bool is_internal_phy;
1055         u32 val;
1056         int ret;
1057
1058         printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1059
1060         ret = usbnet_get_endpoints(dev, intf);
1061         if (ret < 0) {
1062                 netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1063                 return ret;
1064         }
1065
1066         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
1067         if (!pdata)
1068                 return -ENOMEM;
1069
1070         dev->driver_priv = pdata;
1071
1072         spin_lock_init(&pdata->mac_cr_lock);
1073
1074         /* LAN95xx devices do not alter the computed checksum of 0 to 0xffff.
1075          * RFC 2460, ipv6 UDP calculated checksum yields a result of zero must
1076          * be changed to 0xffff. RFC 768, ipv4 UDP computed checksum is zero,
1077          * it is transmitted as all ones. The zero transmitted checksum means
1078          * transmitter generated no checksum. Hence, enable csum offload only
1079          * for ipv4 packets.
1080          */
1081         if (DEFAULT_TX_CSUM_ENABLE)
1082                 dev->net->features |= NETIF_F_IP_CSUM;
1083         if (DEFAULT_RX_CSUM_ENABLE)
1084                 dev->net->features |= NETIF_F_RXCSUM;
1085
1086         dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1087         set_bit(EVENT_NO_IP_ALIGN, &dev->flags);
1088
1089         smsc95xx_init_mac_address(dev);
1090
1091         /* Init all registers */
1092         ret = smsc95xx_reset(dev);
1093         if (ret)
1094                 goto free_pdata;
1095
1096         pdata->mdiobus = mdiobus_alloc();
1097         if (!pdata->mdiobus) {
1098                 ret = -ENOMEM;
1099                 goto free_pdata;
1100         }
1101
1102         ret = smsc95xx_read_reg(dev, HW_CFG, &val);
1103         if (ret < 0)
1104                 goto free_mdio;
1105
1106         is_internal_phy = !(val & HW_CFG_PSEL_);
1107         if (is_internal_phy)
1108                 pdata->mdiobus->phy_mask = ~(1u << SMSC95XX_INTERNAL_PHY_ID);
1109
1110         pdata->mdiobus->priv = dev;
1111         pdata->mdiobus->read = smsc95xx_mdiobus_read;
1112         pdata->mdiobus->write = smsc95xx_mdiobus_write;
1113         pdata->mdiobus->name = "smsc95xx-mdiobus";
1114         pdata->mdiobus->parent = &dev->udev->dev;
1115
1116         snprintf(pdata->mdiobus->id, ARRAY_SIZE(pdata->mdiobus->id),
1117                  "usb-%03d:%03d", dev->udev->bus->busnum, dev->udev->devnum);
1118
1119         ret = mdiobus_register(pdata->mdiobus);
1120         if (ret) {
1121                 netdev_err(dev->net, "Could not register MDIO bus\n");
1122                 goto free_mdio;
1123         }
1124
1125         pdata->phydev = phy_find_first(pdata->mdiobus);
1126         if (!pdata->phydev) {
1127                 netdev_err(dev->net, "no PHY found\n");
1128                 ret = -ENODEV;
1129                 goto unregister_mdio;
1130         }
1131
1132         pdata->phydev->is_internal = is_internal_phy;
1133
1134         /* detect device revision as different features may be available */
1135         ret = smsc95xx_read_reg(dev, ID_REV, &val);
1136         if (ret < 0)
1137                 goto unregister_mdio;
1138
1139         val >>= 16;
1140         if ((val == ID_REV_CHIP_ID_9500A_) || (val == ID_REV_CHIP_ID_9530_) ||
1141             (val == ID_REV_CHIP_ID_89530_) || (val == ID_REV_CHIP_ID_9730_))
1142                 pdata->features = (FEATURE_8_WAKEUP_FILTERS |
1143                         FEATURE_PHY_NLP_CROSSOVER |
1144                         FEATURE_REMOTE_WAKEUP);
1145         else if (val == ID_REV_CHIP_ID_9512_)
1146                 pdata->features = FEATURE_8_WAKEUP_FILTERS;
1147
1148         dev->net->netdev_ops = &smsc95xx_netdev_ops;
1149         dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1150         dev->net->flags |= IFF_MULTICAST;
1151         dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
1152         dev->net->min_mtu = ETH_MIN_MTU;
1153         dev->net->max_mtu = ETH_DATA_LEN;
1154         dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
1155         return 0;
1156
1157 unregister_mdio:
1158         mdiobus_unregister(pdata->mdiobus);
1159
1160 free_mdio:
1161         mdiobus_free(pdata->mdiobus);
1162
1163 free_pdata:
1164         kfree(pdata);
1165         return ret;
1166 }
1167
1168 static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1169 {
1170         struct smsc95xx_priv *pdata = dev->driver_priv;
1171
1172         mdiobus_unregister(pdata->mdiobus);
1173         mdiobus_free(pdata->mdiobus);
1174         netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1175         kfree(pdata);
1176 }
1177
1178 static void smsc95xx_handle_link_change(struct net_device *net)
1179 {
1180         phy_print_status(net->phydev);
1181 }
1182
1183 static int smsc95xx_start_phy(struct usbnet *dev)
1184 {
1185         struct smsc95xx_priv *pdata = dev->driver_priv;
1186         struct net_device *net = dev->net;
1187         int ret;
1188
1189         ret = smsc95xx_reset(dev);
1190         if (ret < 0)
1191                 return ret;
1192
1193         ret = phy_connect_direct(net, pdata->phydev,
1194                                  &smsc95xx_handle_link_change,
1195                                  PHY_INTERFACE_MODE_MII);
1196         if (ret) {
1197                 netdev_err(net, "can't attach PHY to %s\n", pdata->mdiobus->id);
1198                 return ret;
1199         }
1200
1201         phy_attached_info(net->phydev);
1202         phy_start(net->phydev);
1203         return 0;
1204 }
1205
1206 static int smsc95xx_disconnect_phy(struct usbnet *dev)
1207 {
1208         phy_stop(dev->net->phydev);
1209         phy_disconnect(dev->net->phydev);
1210         return 0;
1211 }
1212
1213 static u32 smsc_crc(const u8 *buffer, size_t len, int filter)
1214 {
1215         u32 crc = bitrev16(crc16(0xFFFF, buffer, len));
1216         return crc << ((filter % 2) * 16);
1217 }
1218
1219 static int smsc95xx_enable_phy_wakeup_interrupts(struct usbnet *dev, u16 mask)
1220 {
1221         int ret;
1222
1223         netdev_dbg(dev->net, "enabling PHY wakeup interrupts\n");
1224
1225         /* read to clear */
1226         ret = smsc95xx_mdio_read_nopm(dev, PHY_INT_SRC);
1227         if (ret < 0)
1228                 return ret;
1229
1230         /* enable interrupt source */
1231         ret = smsc95xx_mdio_read_nopm(dev, PHY_INT_MASK);
1232         if (ret < 0)
1233                 return ret;
1234
1235         ret |= mask;
1236
1237         smsc95xx_mdio_write_nopm(dev, PHY_INT_MASK, ret);
1238
1239         return 0;
1240 }
1241
1242 static int smsc95xx_link_ok_nopm(struct usbnet *dev)
1243 {
1244         int ret;
1245
1246         /* first, a dummy read, needed to latch some MII phys */
1247         ret = smsc95xx_mdio_read_nopm(dev, MII_BMSR);
1248         if (ret < 0)
1249                 return ret;
1250
1251         ret = smsc95xx_mdio_read_nopm(dev, MII_BMSR);
1252         if (ret < 0)
1253                 return ret;
1254
1255         return !!(ret & BMSR_LSTATUS);
1256 }
1257
1258 static int smsc95xx_enter_suspend0(struct usbnet *dev)
1259 {
1260         struct smsc95xx_priv *pdata = dev->driver_priv;
1261         u32 val;
1262         int ret;
1263
1264         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1265         if (ret < 0)
1266                 return ret;
1267
1268         val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
1269         val |= PM_CTL_SUS_MODE_0;
1270
1271         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1272         if (ret < 0)
1273                 return ret;
1274
1275         /* clear wol status */
1276         val &= ~PM_CTL_WUPS_;
1277         val |= PM_CTL_WUPS_WOL_;
1278
1279         /* enable energy detection */
1280         if (pdata->wolopts & WAKE_PHY)
1281                 val |= PM_CTL_WUPS_ED_;
1282
1283         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1284         if (ret < 0)
1285                 return ret;
1286
1287         /* read back PM_CTRL */
1288         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1289         if (ret < 0)
1290                 return ret;
1291
1292         pdata->suspend_flags |= SUSPEND_SUSPEND0;
1293
1294         return 0;
1295 }
1296
1297 static int smsc95xx_enter_suspend1(struct usbnet *dev)
1298 {
1299         struct smsc95xx_priv *pdata = dev->driver_priv;
1300         u32 val;
1301         int ret;
1302
1303         /* reconfigure link pulse detection timing for
1304          * compatibility with non-standard link partners
1305          */
1306         if (pdata->features & FEATURE_PHY_NLP_CROSSOVER)
1307                 smsc95xx_mdio_write_nopm(dev, PHY_EDPD_CONFIG,
1308                                          PHY_EDPD_CONFIG_DEFAULT);
1309
1310         /* enable energy detect power-down mode */
1311         ret = smsc95xx_mdio_read_nopm(dev, PHY_MODE_CTRL_STS);
1312         if (ret < 0)
1313                 return ret;
1314
1315         ret |= MODE_CTRL_STS_EDPWRDOWN_;
1316
1317         smsc95xx_mdio_write_nopm(dev, PHY_MODE_CTRL_STS, ret);
1318
1319         /* enter SUSPEND1 mode */
1320         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1321         if (ret < 0)
1322                 return ret;
1323
1324         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1325         val |= PM_CTL_SUS_MODE_1;
1326
1327         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1328         if (ret < 0)
1329                 return ret;
1330
1331         /* clear wol status, enable energy detection */
1332         val &= ~PM_CTL_WUPS_;
1333         val |= (PM_CTL_WUPS_ED_ | PM_CTL_ED_EN_);
1334
1335         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1336         if (ret < 0)
1337                 return ret;
1338
1339         pdata->suspend_flags |= SUSPEND_SUSPEND1;
1340
1341         return 0;
1342 }
1343
1344 static int smsc95xx_enter_suspend2(struct usbnet *dev)
1345 {
1346         struct smsc95xx_priv *pdata = dev->driver_priv;
1347         u32 val;
1348         int ret;
1349
1350         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1351         if (ret < 0)
1352                 return ret;
1353
1354         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1355         val |= PM_CTL_SUS_MODE_2;
1356
1357         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1358         if (ret < 0)
1359                 return ret;
1360
1361         pdata->suspend_flags |= SUSPEND_SUSPEND2;
1362
1363         return 0;
1364 }
1365
1366 static int smsc95xx_enter_suspend3(struct usbnet *dev)
1367 {
1368         struct smsc95xx_priv *pdata = dev->driver_priv;
1369         u32 val;
1370         int ret;
1371
1372         ret = smsc95xx_read_reg_nopm(dev, RX_FIFO_INF, &val);
1373         if (ret < 0)
1374                 return ret;
1375
1376         if (val & RX_FIFO_INF_USED_) {
1377                 netdev_info(dev->net, "rx fifo not empty in autosuspend\n");
1378                 return -EBUSY;
1379         }
1380
1381         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1382         if (ret < 0)
1383                 return ret;
1384
1385         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1386         val |= PM_CTL_SUS_MODE_3 | PM_CTL_RES_CLR_WKP_STS;
1387
1388         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1389         if (ret < 0)
1390                 return ret;
1391
1392         /* clear wol status */
1393         val &= ~PM_CTL_WUPS_;
1394         val |= PM_CTL_WUPS_WOL_;
1395
1396         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1397         if (ret < 0)
1398                 return ret;
1399
1400         pdata->suspend_flags |= SUSPEND_SUSPEND3;
1401
1402         return 0;
1403 }
1404
1405 static int smsc95xx_autosuspend(struct usbnet *dev, u32 link_up)
1406 {
1407         struct smsc95xx_priv *pdata = dev->driver_priv;
1408         int ret;
1409
1410         if (!netif_running(dev->net)) {
1411                 /* interface is ifconfig down so fully power down hw */
1412                 netdev_dbg(dev->net, "autosuspend entering SUSPEND2\n");
1413                 return smsc95xx_enter_suspend2(dev);
1414         }
1415
1416         if (!link_up) {
1417                 /* link is down so enter EDPD mode, but only if device can
1418                  * reliably resume from it.  This check should be redundant
1419                  * as current FEATURE_REMOTE_WAKEUP parts also support
1420                  * FEATURE_PHY_NLP_CROSSOVER but it's included for clarity */
1421                 if (!(pdata->features & FEATURE_PHY_NLP_CROSSOVER)) {
1422                         netdev_warn(dev->net, "EDPD not supported\n");
1423                         return -EBUSY;
1424                 }
1425
1426                 netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n");
1427
1428                 /* enable PHY wakeup events for if cable is attached */
1429                 ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1430                         PHY_INT_MASK_ANEG_COMP_);
1431                 if (ret < 0) {
1432                         netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1433                         return ret;
1434                 }
1435
1436                 netdev_info(dev->net, "entering SUSPEND1 mode\n");
1437                 return smsc95xx_enter_suspend1(dev);
1438         }
1439
1440         /* enable PHY wakeup events so we remote wakeup if cable is pulled */
1441         ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1442                 PHY_INT_MASK_LINK_DOWN_);
1443         if (ret < 0) {
1444                 netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1445                 return ret;
1446         }
1447
1448         netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n");
1449         return smsc95xx_enter_suspend3(dev);
1450 }
1451
1452 static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
1453 {
1454         struct usbnet *dev = usb_get_intfdata(intf);
1455         struct smsc95xx_priv *pdata = dev->driver_priv;
1456         u32 val, link_up;
1457         int ret;
1458
1459         ret = usbnet_suspend(intf, message);
1460         if (ret < 0) {
1461                 netdev_warn(dev->net, "usbnet_suspend error\n");
1462                 return ret;
1463         }
1464
1465         if (pdata->suspend_flags) {
1466                 netdev_warn(dev->net, "error during last resume\n");
1467                 pdata->suspend_flags = 0;
1468         }
1469
1470         /* determine if link is up using only _nopm functions */
1471         link_up = smsc95xx_link_ok_nopm(dev);
1472
1473         if (message.event == PM_EVENT_AUTO_SUSPEND &&
1474             (pdata->features & FEATURE_REMOTE_WAKEUP)) {
1475                 ret = smsc95xx_autosuspend(dev, link_up);
1476                 goto done;
1477         }
1478
1479         /* if we get this far we're not autosuspending */
1480         /* if no wol options set, or if link is down and we're not waking on
1481          * PHY activity, enter lowest power SUSPEND2 mode
1482          */
1483         if (!(pdata->wolopts & SUPPORTED_WAKE) ||
1484                 !(link_up || (pdata->wolopts & WAKE_PHY))) {
1485                 netdev_info(dev->net, "entering SUSPEND2 mode\n");
1486
1487                 /* disable energy detect (link up) & wake up events */
1488                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1489                 if (ret < 0)
1490                         goto done;
1491
1492                 val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
1493
1494                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1495                 if (ret < 0)
1496                         goto done;
1497
1498                 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1499                 if (ret < 0)
1500                         goto done;
1501
1502                 val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
1503
1504                 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1505                 if (ret < 0)
1506                         goto done;
1507
1508                 ret = smsc95xx_enter_suspend2(dev);
1509                 goto done;
1510         }
1511
1512         if (pdata->wolopts & WAKE_PHY) {
1513                 ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1514                         (PHY_INT_MASK_ANEG_COMP_ | PHY_INT_MASK_LINK_DOWN_));
1515                 if (ret < 0) {
1516                         netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1517                         goto done;
1518                 }
1519
1520                 /* if link is down then configure EDPD and enter SUSPEND1,
1521                  * otherwise enter SUSPEND0 below
1522                  */
1523                 if (!link_up) {
1524                         netdev_info(dev->net, "entering SUSPEND1 mode\n");
1525                         ret = smsc95xx_enter_suspend1(dev);
1526                         goto done;
1527                 }
1528         }
1529
1530         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1531                 u32 *filter_mask = kcalloc(32, sizeof(u32), GFP_KERNEL);
1532                 u32 command[2];
1533                 u32 offset[2];
1534                 u32 crc[4];
1535                 int wuff_filter_count =
1536                         (pdata->features & FEATURE_8_WAKEUP_FILTERS) ?
1537                         LAN9500A_WUFF_NUM : LAN9500_WUFF_NUM;
1538                 int i, filter = 0;
1539
1540                 if (!filter_mask) {
1541                         netdev_warn(dev->net, "Unable to allocate filter_mask\n");
1542                         ret = -ENOMEM;
1543                         goto done;
1544                 }
1545
1546                 memset(command, 0, sizeof(command));
1547                 memset(offset, 0, sizeof(offset));
1548                 memset(crc, 0, sizeof(crc));
1549
1550                 if (pdata->wolopts & WAKE_BCAST) {
1551                         const u8 bcast[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
1552                         netdev_info(dev->net, "enabling broadcast detection\n");
1553                         filter_mask[filter * 4] = 0x003F;
1554                         filter_mask[filter * 4 + 1] = 0x00;
1555                         filter_mask[filter * 4 + 2] = 0x00;
1556                         filter_mask[filter * 4 + 3] = 0x00;
1557                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1558                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1559                         crc[filter/2] |= smsc_crc(bcast, 6, filter);
1560                         filter++;
1561                 }
1562
1563                 if (pdata->wolopts & WAKE_MCAST) {
1564                         const u8 mcast[] = {0x01, 0x00, 0x5E};
1565                         netdev_info(dev->net, "enabling multicast detection\n");
1566                         filter_mask[filter * 4] = 0x0007;
1567                         filter_mask[filter * 4 + 1] = 0x00;
1568                         filter_mask[filter * 4 + 2] = 0x00;
1569                         filter_mask[filter * 4 + 3] = 0x00;
1570                         command[filter/4] |= 0x09UL << ((filter % 4) * 8);
1571                         offset[filter/4] |= 0x00  << ((filter % 4) * 8);
1572                         crc[filter/2] |= smsc_crc(mcast, 3, filter);
1573                         filter++;
1574                 }
1575
1576                 if (pdata->wolopts & WAKE_ARP) {
1577                         const u8 arp[] = {0x08, 0x06};
1578                         netdev_info(dev->net, "enabling ARP detection\n");
1579                         filter_mask[filter * 4] = 0x0003;
1580                         filter_mask[filter * 4 + 1] = 0x00;
1581                         filter_mask[filter * 4 + 2] = 0x00;
1582                         filter_mask[filter * 4 + 3] = 0x00;
1583                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1584                         offset[filter/4] |= 0x0C << ((filter % 4) * 8);
1585                         crc[filter/2] |= smsc_crc(arp, 2, filter);
1586                         filter++;
1587                 }
1588
1589                 if (pdata->wolopts & WAKE_UCAST) {
1590                         netdev_info(dev->net, "enabling unicast detection\n");
1591                         filter_mask[filter * 4] = 0x003F;
1592                         filter_mask[filter * 4 + 1] = 0x00;
1593                         filter_mask[filter * 4 + 2] = 0x00;
1594                         filter_mask[filter * 4 + 3] = 0x00;
1595                         command[filter/4] |= 0x01UL << ((filter % 4) * 8);
1596                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1597                         crc[filter/2] |= smsc_crc(dev->net->dev_addr, ETH_ALEN, filter);
1598                         filter++;
1599                 }
1600
1601                 for (i = 0; i < (wuff_filter_count * 4); i++) {
1602                         ret = smsc95xx_write_reg_nopm(dev, WUFF, filter_mask[i]);
1603                         if (ret < 0) {
1604                                 kfree(filter_mask);
1605                                 goto done;
1606                         }
1607                 }
1608                 kfree(filter_mask);
1609
1610                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1611                         ret = smsc95xx_write_reg_nopm(dev, WUFF, command[i]);
1612                         if (ret < 0)
1613                                 goto done;
1614                 }
1615
1616                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1617                         ret = smsc95xx_write_reg_nopm(dev, WUFF, offset[i]);
1618                         if (ret < 0)
1619                                 goto done;
1620                 }
1621
1622                 for (i = 0; i < (wuff_filter_count / 2); i++) {
1623                         ret = smsc95xx_write_reg_nopm(dev, WUFF, crc[i]);
1624                         if (ret < 0)
1625                                 goto done;
1626                 }
1627
1628                 /* clear any pending pattern match packet status */
1629                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1630                 if (ret < 0)
1631                         goto done;
1632
1633                 val |= WUCSR_WUFR_;
1634
1635                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1636                 if (ret < 0)
1637                         goto done;
1638         }
1639
1640         if (pdata->wolopts & WAKE_MAGIC) {
1641                 /* clear any pending magic packet status */
1642                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1643                 if (ret < 0)
1644                         goto done;
1645
1646                 val |= WUCSR_MPR_;
1647
1648                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1649                 if (ret < 0)
1650                         goto done;
1651         }
1652
1653         /* enable/disable wakeup sources */
1654         ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1655         if (ret < 0)
1656                 goto done;
1657
1658         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1659                 netdev_info(dev->net, "enabling pattern match wakeup\n");
1660                 val |= WUCSR_WAKE_EN_;
1661         } else {
1662                 netdev_info(dev->net, "disabling pattern match wakeup\n");
1663                 val &= ~WUCSR_WAKE_EN_;
1664         }
1665
1666         if (pdata->wolopts & WAKE_MAGIC) {
1667                 netdev_info(dev->net, "enabling magic packet wakeup\n");
1668                 val |= WUCSR_MPEN_;
1669         } else {
1670                 netdev_info(dev->net, "disabling magic packet wakeup\n");
1671                 val &= ~WUCSR_MPEN_;
1672         }
1673
1674         ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1675         if (ret < 0)
1676                 goto done;
1677
1678         /* enable wol wakeup source */
1679         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1680         if (ret < 0)
1681                 goto done;
1682
1683         val |= PM_CTL_WOL_EN_;
1684
1685         /* phy energy detect wakeup source */
1686         if (pdata->wolopts & WAKE_PHY)
1687                 val |= PM_CTL_ED_EN_;
1688
1689         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1690         if (ret < 0)
1691                 goto done;
1692
1693         /* enable receiver to enable frame reception */
1694         smsc95xx_start_rx_path(dev, 1);
1695
1696         /* some wol options are enabled, so enter SUSPEND0 */
1697         netdev_info(dev->net, "entering SUSPEND0 mode\n");
1698         ret = smsc95xx_enter_suspend0(dev);
1699
1700 done:
1701         /*
1702          * TODO: resume() might need to handle the suspend failure
1703          * in system sleep
1704          */
1705         if (ret && PMSG_IS_AUTO(message))
1706                 usbnet_resume(intf);
1707
1708         return ret;
1709 }
1710
1711 static int smsc95xx_resume(struct usb_interface *intf)
1712 {
1713         struct usbnet *dev = usb_get_intfdata(intf);
1714         struct smsc95xx_priv *pdata;
1715         u8 suspend_flags;
1716         int ret;
1717         u32 val;
1718
1719         BUG_ON(!dev);
1720         pdata = dev->driver_priv;
1721         suspend_flags = pdata->suspend_flags;
1722
1723         netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags);
1724
1725         /* do this first to ensure it's cleared even in error case */
1726         pdata->suspend_flags = 0;
1727
1728         if (suspend_flags & SUSPEND_ALLMODES) {
1729                 /* clear wake-up sources */
1730                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1731                 if (ret < 0)
1732                         return ret;
1733
1734                 val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
1735
1736                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1737                 if (ret < 0)
1738                         return ret;
1739
1740                 /* clear wake-up status */
1741                 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1742                 if (ret < 0)
1743                         return ret;
1744
1745                 val &= ~PM_CTL_WOL_EN_;
1746                 val |= PM_CTL_WUPS_;
1747
1748                 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1749                 if (ret < 0)
1750                         return ret;
1751         }
1752
1753         ret = usbnet_resume(intf);
1754         if (ret < 0)
1755                 netdev_warn(dev->net, "usbnet_resume error\n");
1756
1757         phy_init_hw(pdata->phydev);
1758         return ret;
1759 }
1760
1761 static int smsc95xx_reset_resume(struct usb_interface *intf)
1762 {
1763         struct usbnet *dev = usb_get_intfdata(intf);
1764         int ret;
1765
1766         ret = smsc95xx_reset(dev);
1767         if (ret < 0)
1768                 return ret;
1769
1770         return smsc95xx_resume(intf);
1771 }
1772
1773 static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1774 {
1775         skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
1776         skb->ip_summed = CHECKSUM_COMPLETE;
1777         skb_trim(skb, skb->len - 2);
1778 }
1779
1780 static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1781 {
1782         /* This check is no longer done by usbnet */
1783         if (skb->len < dev->net->hard_header_len)
1784                 return 0;
1785
1786         while (skb->len > 0) {
1787                 u32 header, align_count;
1788                 struct sk_buff *ax_skb;
1789                 unsigned char *packet;
1790                 u16 size;
1791
1792                 header = get_unaligned_le32(skb->data);
1793                 skb_pull(skb, 4 + NET_IP_ALIGN);
1794                 packet = skb->data;
1795
1796                 /* get the packet length */
1797                 size = (u16)((header & RX_STS_FL_) >> 16);
1798                 align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1799
1800                 if (unlikely(header & RX_STS_ES_)) {
1801                         netif_dbg(dev, rx_err, dev->net,
1802                                   "Error header=0x%08x\n", header);
1803                         dev->net->stats.rx_errors++;
1804                         dev->net->stats.rx_dropped++;
1805
1806                         if (header & RX_STS_CRC_) {
1807                                 dev->net->stats.rx_crc_errors++;
1808                         } else {
1809                                 if (header & (RX_STS_TL_ | RX_STS_RF_))
1810                                         dev->net->stats.rx_frame_errors++;
1811
1812                                 if ((header & RX_STS_LE_) &&
1813                                         (!(header & RX_STS_FT_)))
1814                                         dev->net->stats.rx_length_errors++;
1815                         }
1816                 } else {
1817                         /* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1818                         if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1819                                 netif_dbg(dev, rx_err, dev->net,
1820                                           "size err header=0x%08x\n", header);
1821                                 return 0;
1822                         }
1823
1824                         /* last frame in this batch */
1825                         if (skb->len == size) {
1826                                 if (dev->net->features & NETIF_F_RXCSUM)
1827                                         smsc95xx_rx_csum_offload(skb);
1828                                 skb_trim(skb, skb->len - 4); /* remove fcs */
1829                                 skb->truesize = size + sizeof(struct sk_buff);
1830
1831                                 return 1;
1832                         }
1833
1834                         ax_skb = skb_clone(skb, GFP_ATOMIC);
1835                         if (unlikely(!ax_skb)) {
1836                                 netdev_warn(dev->net, "Error allocating skb\n");
1837                                 return 0;
1838                         }
1839
1840                         ax_skb->len = size;
1841                         ax_skb->data = packet;
1842                         skb_set_tail_pointer(ax_skb, size);
1843
1844                         if (dev->net->features & NETIF_F_RXCSUM)
1845                                 smsc95xx_rx_csum_offload(ax_skb);
1846                         skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1847                         ax_skb->truesize = size + sizeof(struct sk_buff);
1848
1849                         usbnet_skb_return(dev, ax_skb);
1850                 }
1851
1852                 skb_pull(skb, size);
1853
1854                 /* padding bytes before the next frame starts */
1855                 if (skb->len)
1856                         skb_pull(skb, align_count);
1857         }
1858
1859         return 1;
1860 }
1861
1862 static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1863 {
1864         u16 low_16 = (u16)skb_checksum_start_offset(skb);
1865         u16 high_16 = low_16 + skb->csum_offset;
1866         return (high_16 << 16) | low_16;
1867 }
1868
1869 /* The TX CSUM won't work if the checksum lies in the last 4 bytes of the
1870  * transmission. This is fairly unlikely, only seems to trigger with some
1871  * short TCP ACK packets sent.
1872  *
1873  * Note, this calculation should probably check for the alignment of the
1874  * data as well, but a straight check for csum being in the last four bytes
1875  * of the packet should be ok for now.
1876  */
1877 static bool smsc95xx_can_tx_checksum(struct sk_buff *skb)
1878 {
1879        unsigned int len = skb->len - skb_checksum_start_offset(skb);
1880
1881        if (skb->len <= 45)
1882                return false;
1883        return skb->csum_offset < (len - (4 + 1));
1884 }
1885
1886 static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1887                                          struct sk_buff *skb, gfp_t flags)
1888 {
1889         bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
1890         int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
1891         u32 tx_cmd_a, tx_cmd_b;
1892         void *ptr;
1893
1894         /* We do not advertise SG, so skbs should be already linearized */
1895         BUG_ON(skb_shinfo(skb)->nr_frags);
1896
1897         /* Make writable and expand header space by overhead if required */
1898         if (skb_cow_head(skb, overhead)) {
1899                 /* Must deallocate here as returning NULL to indicate error
1900                  * means the skb won't be deallocated in the caller.
1901                  */
1902                 dev_kfree_skb_any(skb);
1903                 return NULL;
1904         }
1905
1906         tx_cmd_b = (u32)skb->len;
1907         tx_cmd_a = tx_cmd_b | TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
1908
1909         if (csum) {
1910                 if (!smsc95xx_can_tx_checksum(skb)) {
1911                         /* workaround - hardware tx checksum does not work
1912                          * properly with extremely small packets */
1913                         long csstart = skb_checksum_start_offset(skb);
1914                         __wsum calc = csum_partial(skb->data + csstart,
1915                                 skb->len - csstart, 0);
1916                         *((__sum16 *)(skb->data + csstart
1917                                 + skb->csum_offset)) = csum_fold(calc);
1918
1919                         csum = false;
1920                 } else {
1921                         u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
1922                         ptr = skb_push(skb, 4);
1923                         put_unaligned_le32(csum_preamble, ptr);
1924
1925                         tx_cmd_a += 4;
1926                         tx_cmd_b += 4;
1927                         tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
1928                 }
1929         }
1930
1931         ptr = skb_push(skb, 8);
1932         put_unaligned_le32(tx_cmd_a, ptr);
1933         put_unaligned_le32(tx_cmd_b, ptr+4);
1934
1935         return skb;
1936 }
1937
1938 static int smsc95xx_manage_power(struct usbnet *dev, int on)
1939 {
1940         struct smsc95xx_priv *pdata = dev->driver_priv;
1941
1942         dev->intf->needs_remote_wakeup = on;
1943
1944         if (pdata->features & FEATURE_REMOTE_WAKEUP)
1945                 return 0;
1946
1947         /* this chip revision isn't capable of remote wakeup */
1948         netdev_info(dev->net, "hardware isn't capable of remote wakeup\n");
1949
1950         if (on)
1951                 usb_autopm_get_interface_no_resume(dev->intf);
1952         else
1953                 usb_autopm_put_interface(dev->intf);
1954
1955         return 0;
1956 }
1957
1958 static const struct driver_info smsc95xx_info = {
1959         .description    = "smsc95xx USB 2.0 Ethernet",
1960         .bind           = smsc95xx_bind,
1961         .unbind         = smsc95xx_unbind,
1962         .link_reset     = smsc95xx_link_reset,
1963         .reset          = smsc95xx_start_phy,
1964         .stop           = smsc95xx_disconnect_phy,
1965         .rx_fixup       = smsc95xx_rx_fixup,
1966         .tx_fixup       = smsc95xx_tx_fixup,
1967         .status         = smsc95xx_status,
1968         .manage_power   = smsc95xx_manage_power,
1969         .flags          = FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
1970 };
1971
1972 static const struct usb_device_id products[] = {
1973         {
1974                 /* SMSC9500 USB Ethernet Device */
1975                 USB_DEVICE(0x0424, 0x9500),
1976                 .driver_info = (unsigned long) &smsc95xx_info,
1977         },
1978         {
1979                 /* SMSC9505 USB Ethernet Device */
1980                 USB_DEVICE(0x0424, 0x9505),
1981                 .driver_info = (unsigned long) &smsc95xx_info,
1982         },
1983         {
1984                 /* SMSC9500A USB Ethernet Device */
1985                 USB_DEVICE(0x0424, 0x9E00),
1986                 .driver_info = (unsigned long) &smsc95xx_info,
1987         },
1988         {
1989                 /* SMSC9505A USB Ethernet Device */
1990                 USB_DEVICE(0x0424, 0x9E01),
1991                 .driver_info = (unsigned long) &smsc95xx_info,
1992         },
1993         {
1994                 /* SMSC9512/9514 USB Hub & Ethernet Device */
1995                 USB_DEVICE(0x0424, 0xec00),
1996                 .driver_info = (unsigned long) &smsc95xx_info,
1997         },
1998         {
1999                 /* SMSC9500 USB Ethernet Device (SAL10) */
2000                 USB_DEVICE(0x0424, 0x9900),
2001                 .driver_info = (unsigned long) &smsc95xx_info,
2002         },
2003         {
2004                 /* SMSC9505 USB Ethernet Device (SAL10) */
2005                 USB_DEVICE(0x0424, 0x9901),
2006                 .driver_info = (unsigned long) &smsc95xx_info,
2007         },
2008         {
2009                 /* SMSC9500A USB Ethernet Device (SAL10) */
2010                 USB_DEVICE(0x0424, 0x9902),
2011                 .driver_info = (unsigned long) &smsc95xx_info,
2012         },
2013         {
2014                 /* SMSC9505A USB Ethernet Device (SAL10) */
2015                 USB_DEVICE(0x0424, 0x9903),
2016                 .driver_info = (unsigned long) &smsc95xx_info,
2017         },
2018         {
2019                 /* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
2020                 USB_DEVICE(0x0424, 0x9904),
2021                 .driver_info = (unsigned long) &smsc95xx_info,
2022         },
2023         {
2024                 /* SMSC9500A USB Ethernet Device (HAL) */
2025                 USB_DEVICE(0x0424, 0x9905),
2026                 .driver_info = (unsigned long) &smsc95xx_info,
2027         },
2028         {
2029                 /* SMSC9505A USB Ethernet Device (HAL) */
2030                 USB_DEVICE(0x0424, 0x9906),
2031                 .driver_info = (unsigned long) &smsc95xx_info,
2032         },
2033         {
2034                 /* SMSC9500 USB Ethernet Device (Alternate ID) */
2035                 USB_DEVICE(0x0424, 0x9907),
2036                 .driver_info = (unsigned long) &smsc95xx_info,
2037         },
2038         {
2039                 /* SMSC9500A USB Ethernet Device (Alternate ID) */
2040                 USB_DEVICE(0x0424, 0x9908),
2041                 .driver_info = (unsigned long) &smsc95xx_info,
2042         },
2043         {
2044                 /* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
2045                 USB_DEVICE(0x0424, 0x9909),
2046                 .driver_info = (unsigned long) &smsc95xx_info,
2047         },
2048         {
2049                 /* SMSC LAN9530 USB Ethernet Device */
2050                 USB_DEVICE(0x0424, 0x9530),
2051                 .driver_info = (unsigned long) &smsc95xx_info,
2052         },
2053         {
2054                 /* SMSC LAN9730 USB Ethernet Device */
2055                 USB_DEVICE(0x0424, 0x9730),
2056                 .driver_info = (unsigned long) &smsc95xx_info,
2057         },
2058         {
2059                 /* SMSC LAN89530 USB Ethernet Device */
2060                 USB_DEVICE(0x0424, 0x9E08),
2061                 .driver_info = (unsigned long) &smsc95xx_info,
2062         },
2063         { },            /* END */
2064 };
2065 MODULE_DEVICE_TABLE(usb, products);
2066
2067 static struct usb_driver smsc95xx_driver = {
2068         .name           = "smsc95xx",
2069         .id_table       = products,
2070         .probe          = usbnet_probe,
2071         .suspend        = smsc95xx_suspend,
2072         .resume         = smsc95xx_resume,
2073         .reset_resume   = smsc95xx_reset_resume,
2074         .disconnect     = usbnet_disconnect,
2075         .disable_hub_initiated_lpm = 1,
2076         .supports_autosuspend = 1,
2077 };
2078
2079 module_usb_driver(smsc95xx_driver);
2080
2081 MODULE_AUTHOR("Nancy Lin");
2082 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
2083 MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
2084 MODULE_LICENSE("GPL");