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 (ret < 0) {
  88                 if (ret != -ENODEV)
  89                         netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d\n",
  90                                     index, ret);
  91                 return ret;
  92         }
  93
  94         le32_to_cpus(&buf);
  95         *data = buf;
  96
  97         return ret;
  98 }
  99
 100 static int __must_check __smsc95xx_write_reg(struct usbnet *dev, u32 index,
 101                                              u32 data, int in_pm)
 102 {
 103         u32 buf;
 104         int ret;
 105         int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
 106
 107         BUG_ON(!dev);
 108
 109         if (!in_pm)
 110                 fn = usbnet_write_cmd;
 111         else
 112                 fn = usbnet_write_cmd_nopm;
 113
 114         buf = data;
 115         cpu_to_le32s(&buf);
 116
 117         ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
 118                  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 119                  0, index, &buf, 4);
 120         if (ret < 0 && ret != -ENODEV)
 121                 netdev_warn(dev->net, "Failed to write reg index 0x%08x: %d\n",
 122                             index, ret);
 123
 124         return ret;
 125 }
 126
 127 static int __must_check smsc95xx_read_reg_nopm(struct usbnet *dev, u32 index,
 128                                                u32 *data)
 129 {
 130         return __smsc95xx_read_reg(dev, index, data, 1);
 131 }
 132
 133 static int __must_check smsc95xx_write_reg_nopm(struct usbnet *dev, u32 index,
 134                                                 u32 data)
 135 {
 136         return __smsc95xx_write_reg(dev, index, data, 1);
 137 }
 138
 139 static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
 140                                           u32 *data)
 141 {
 142         return __smsc95xx_read_reg(dev, index, data, 0);
 143 }
 144
 145 static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
 146                                            u32 data)
 147 {
 148         return __smsc95xx_write_reg(dev, index, data, 0);
 149 }
 150
 151 /* Loop until the read is completed with timeout
 152  * called with phy_mutex held */
 153 static int __must_check __smsc95xx_phy_wait_not_busy(struct usbnet *dev,
 154                                                      int in_pm)
 155 {
 156         unsigned long start_time = jiffies;
 157         u32 val;
 158         int ret;
 159
 160         do {
 161                 ret = __smsc95xx_read_reg(dev, MII_ADDR, &val, in_pm);
 162                 if (ret < 0) {
 163                         /* Ignore -ENODEV error during disconnect() */
 164                         if (ret == -ENODEV)
 165                                 return 0;
 166                         netdev_warn(dev->net, "Error reading MII_ACCESS\n");
 167                         return ret;
 168                 }
 169
 170                 if (!(val & MII_BUSY_))
 171                         return 0;
 172         } while (!time_after(jiffies, start_time + HZ));
 173
 174         return -EIO;
 175 }
 176
 177 static u32 mii_address_cmd(int phy_id, int idx, u16 op)
 178 {
 179         return (phy_id & 0x1f) << 11 | (idx & 0x1f) << 6 | op;
 180 }
 181
 182 static int __smsc95xx_mdio_read(struct usbnet *dev, int phy_id, int idx,
 183                                 int in_pm)
 184 {
 185         u32 val, addr;
 186         int ret;
 187
 188         mutex_lock(&dev->phy_mutex);
 189
 190         /* confirm MII not busy */
 191         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 192         if (ret < 0) {
 193                 netdev_warn(dev->net, "%s: MII is busy\n", __func__);
 194                 goto done;
 195         }
 196
 197         /* set the address, index & direction (read from PHY) */
 198         addr = mii_address_cmd(phy_id, idx, MII_READ_ | MII_BUSY_);
 199         ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
 200         if (ret < 0) {
 201                 if (ret != -ENODEV)
 202                         netdev_warn(dev->net, "Error writing MII_ADDR\n");
 203                 goto done;
 204         }
 205
 206         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 207         if (ret < 0) {
 208                 netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
 209                 goto done;
 210         }
 211
 212         ret = __smsc95xx_read_reg(dev, MII_DATA, &val, in_pm);
 213         if (ret < 0) {
 214                 if (ret != -ENODEV)
 215                         netdev_warn(dev->net, "Error reading MII_DATA\n");
 216                 goto done;
 217         }
 218
 219         ret = (u16)(val & 0xFFFF);
 220
 221 done:
 222         mutex_unlock(&dev->phy_mutex);
 223
 224         /* Ignore -ENODEV error during disconnect() */
 225         if (ret == -ENODEV)
 226                 return 0;
 227         return ret;
 228 }
 229
 230 static void __smsc95xx_mdio_write(struct usbnet *dev, int phy_id,
 231                                   int idx, int regval, int in_pm)
 232 {
 233         u32 val, addr;
 234         int ret;
 235
 236         mutex_lock(&dev->phy_mutex);
 237
 238         /* confirm MII not busy */
 239         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 240         if (ret < 0) {
 241                 netdev_warn(dev->net, "%s: MII is busy\n", __func__);
 242                 goto done;
 243         }
 244
 245         val = regval;
 246         ret = __smsc95xx_write_reg(dev, MII_DATA, val, in_pm);
 247         if (ret < 0) {
 248                 if (ret != -ENODEV)
 249                         netdev_warn(dev->net, "Error writing MII_DATA\n");
 250                 goto done;
 251         }
 252
 253         /* set the address, index & direction (write to PHY) */
 254         addr = mii_address_cmd(phy_id, idx, MII_WRITE_ | MII_BUSY_);
 255         ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
 256         if (ret < 0) {
 257                 if (ret != -ENODEV)
 258                         netdev_warn(dev->net, "Error writing MII_ADDR\n");
 259                 goto done;
 260         }
 261
 262         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 263         if (ret < 0) {
 264                 netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
 265                 goto done;
 266         }
 267
 268 done:
 269         mutex_unlock(&dev->phy_mutex);
 270 }
 271
 272 static int smsc95xx_mdio_read_nopm(struct usbnet *dev, int idx)
 273 {
 274         struct smsc95xx_priv *pdata = dev->driver_priv;
 275
 276         return __smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, idx, 1);
 277 }
 278
 279 static void smsc95xx_mdio_write_nopm(struct usbnet *dev, int idx, int regval)
 280 {
 281         struct smsc95xx_priv *pdata = dev->driver_priv;
 282
 283         __smsc95xx_mdio_write(dev, pdata->phydev->mdio.addr, idx, regval, 1);
 284 }
 285
 286 static int smsc95xx_mdiobus_read(struct mii_bus *bus, int phy_id, int idx)
 287 {
 288         struct usbnet *dev = bus->priv;
 289
 290         return __smsc95xx_mdio_read(dev, phy_id, idx, 0);
 291 }
 292
 293 static int smsc95xx_mdiobus_write(struct mii_bus *bus, int phy_id, int idx,
 294                                   u16 regval)
 295 {
 296         struct usbnet *dev = bus->priv;
 297
 298         __smsc95xx_mdio_write(dev, phy_id, idx, regval, 0);
 299         return 0;
 300 }
 301
 302 static int __must_check smsc95xx_wait_eeprom(struct usbnet *dev)
 303 {
 304         unsigned long start_time = jiffies;
 305         u32 val;
 306         int ret;
 307
 308         do {
 309                 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
 310                 if (ret < 0) {
 311                         netdev_warn(dev->net, "Error reading E2P_CMD\n");
 312                         return ret;
 313                 }
 314
 315                 if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
 316                         break;
 317                 udelay(40);
 318         } while (!time_after(jiffies, start_time + HZ));
 319
 320         if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
 321                 netdev_warn(dev->net, "EEPROM read operation timeout\n");
 322                 return -EIO;
 323         }
 324
 325         return 0;
 326 }
 327
 328 static int __must_check smsc95xx_eeprom_confirm_not_busy(struct usbnet *dev)
 329 {
 330         unsigned long start_time = jiffies;
 331         u32 val;
 332         int ret;
 333
 334         do {
 335                 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
 336                 if (ret < 0) {
 337                         netdev_warn(dev->net, "Error reading E2P_CMD\n");
 338                         return ret;
 339                 }
 340
 341                 if (!(val & E2P_CMD_BUSY_))
 342                         return 0;
 343
 344                 udelay(40);
 345         } while (!time_after(jiffies, start_time + HZ));
 346
 347         netdev_warn(dev->net, "EEPROM is busy\n");
 348         return -EIO;
 349 }
 350
 351 static int smsc95xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
 352                                 u8 *data)
 353 {
 354         u32 val;
 355         int i, ret;
 356
 357         BUG_ON(!dev);
 358         BUG_ON(!data);
 359
 360         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 361         if (ret)
 362                 return ret;
 363
 364         for (i = 0; i < length; i++) {
 365                 val = E2P_CMD_BUSY_ | E2P_CMD_READ_ | (offset & E2P_CMD_ADDR_);
 366                 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 367                 if (ret < 0) {
 368                         netdev_warn(dev->net, "Error writing E2P_CMD\n");
 369                         return ret;
 370                 }
 371
 372                 ret = smsc95xx_wait_eeprom(dev);
 373                 if (ret < 0)
 374                         return ret;
 375
 376                 ret = smsc95xx_read_reg(dev, E2P_DATA, &val);
 377                 if (ret < 0) {
 378                         netdev_warn(dev->net, "Error reading E2P_DATA\n");
 379                         return ret;
 380                 }
 381
 382                 data[i] = val & 0xFF;
 383                 offset++;
 384         }
 385
 386         return 0;
 387 }
 388
 389 static int smsc95xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
 390                                  u8 *data)
 391 {
 392         u32 val;
 393         int i, ret;
 394
 395         BUG_ON(!dev);
 396         BUG_ON(!data);
 397
 398         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 399         if (ret)
 400                 return ret;
 401
 402         /* Issue write/erase enable command */
 403         val = E2P_CMD_BUSY_ | E2P_CMD_EWEN_;
 404         ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 405         if (ret < 0) {
 406                 netdev_warn(dev->net, "Error writing E2P_DATA\n");
 407                 return ret;
 408         }
 409
 410         ret = smsc95xx_wait_eeprom(dev);
 411         if (ret < 0)
 412                 return ret;
 413
 414         for (i = 0; i < length; i++) {
 415
 416                 /* Fill data register */
 417                 val = data[i];
 418                 ret = smsc95xx_write_reg(dev, E2P_DATA, val);
 419                 if (ret < 0) {
 420                         netdev_warn(dev->net, "Error writing E2P_DATA\n");
 421                         return ret;
 422                 }
 423
 424                 /* Send "write" command */
 425                 val = E2P_CMD_BUSY_ | E2P_CMD_WRITE_ | (offset & E2P_CMD_ADDR_);
 426                 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 427                 if (ret < 0) {
 428                         netdev_warn(dev->net, "Error writing E2P_CMD\n");
 429                         return ret;
 430                 }
 431
 432                 ret = smsc95xx_wait_eeprom(dev);
 433                 if (ret < 0)
 434                         return ret;
 435
 436                 offset++;
 437         }
 438
 439         return 0;
 440 }
 441
 442 static int __must_check smsc95xx_write_reg_async(struct usbnet *dev, u16 index,
 443                                                  u32 data)
 444 {
 445         const u16 size = 4;
 446         u32 buf;
 447         int ret;
 448
 449         buf = data;
 450         cpu_to_le32s(&buf);
 451
 452         ret = usbnet_write_cmd_async(dev, USB_VENDOR_REQUEST_WRITE_REGISTER,
 453                                      USB_DIR_OUT | USB_TYPE_VENDOR |
 454                                      USB_RECIP_DEVICE,
 455                                      0, index, &buf, size);
 456         if (ret < 0)
 457                 netdev_warn(dev->net, "Error write async cmd, sts=%d\n",
 458                             ret);
 459         return ret;
 460 }
 461
 462 /* returns hash bit number for given MAC address
 463  * example:
 464  * 01 00 5E 00 00 01 -> returns bit number 31 */
 465 static unsigned int smsc95xx_hash(char addr[ETH_ALEN])
 466 {
 467         return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
 468 }
 469
 470 static void smsc95xx_set_multicast(struct net_device *netdev)
 471 {
 472         struct usbnet *dev = netdev_priv(netdev);
 473         struct smsc95xx_priv *pdata = dev->driver_priv;
 474         unsigned long flags;
 475         int ret;
 476
 477         pdata->hash_hi = 0;
 478         pdata->hash_lo = 0;
 479
 480         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 481
 482         if (dev->net->flags & IFF_PROMISC) {
 483                 netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
 484                 pdata->mac_cr |= MAC_CR_PRMS_;
 485                 pdata->mac_cr &= ~(MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 486         } else if (dev->net->flags & IFF_ALLMULTI) {
 487                 netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
 488                 pdata->mac_cr |= MAC_CR_MCPAS_;
 489                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_HPFILT_);
 490         } else if (!netdev_mc_empty(dev->net)) {
 491                 struct netdev_hw_addr *ha;
 492
 493                 pdata->mac_cr |= MAC_CR_HPFILT_;
 494                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);
 495
 496                 netdev_for_each_mc_addr(ha, netdev) {
 497                         u32 bitnum = smsc95xx_hash(ha->addr);
 498                         u32 mask = 0x01 << (bitnum & 0x1F);
 499                         if (bitnum & 0x20)
 500                                 pdata->hash_hi |= mask;
 501                         else
 502                                 pdata->hash_lo |= mask;
 503                 }
 504
 505                 netif_dbg(dev, drv, dev->net, "HASHH=0x%08X, HASHL=0x%08X\n",
 506                                    pdata->hash_hi, pdata->hash_lo);
 507         } else {
 508                 netif_dbg(dev, drv, dev->net, "receive own packets only\n");
 509                 pdata->mac_cr &=
 510                         ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 511         }
 512
 513         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 514
 515         /* Initiate async writes, as we can't wait for completion here */
 516         ret = smsc95xx_write_reg_async(dev, HASHH, pdata->hash_hi);
 517         if (ret < 0)
 518                 netdev_warn(dev->net, "failed to initiate async write to HASHH\n");
 519
 520         ret = smsc95xx_write_reg_async(dev, HASHL, pdata->hash_lo);
 521         if (ret < 0)
 522                 netdev_warn(dev->net, "failed to initiate async write to HASHL\n");
 523
 524         ret = smsc95xx_write_reg_async(dev, MAC_CR, pdata->mac_cr);
 525         if (ret < 0)
 526                 netdev_warn(dev->net, "failed to initiate async write to MAC_CR\n");
 527 }
 528
 529 static int smsc95xx_phy_update_flowcontrol(struct usbnet *dev)
 530 {
 531         u32 flow = 0, afc_cfg;
 532         struct smsc95xx_priv *pdata = dev->driver_priv;
 533         bool tx_pause, rx_pause;
 534
 535         int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
 536         if (ret < 0)
 537                 return ret;
 538
 539         if (pdata->phydev->duplex == DUPLEX_FULL) {
 540                 phy_get_pause(pdata->phydev, &tx_pause, &rx_pause);
 541
 542                 if (rx_pause)
 543                         flow = 0xFFFF0002;
 544
 545                 if (tx_pause) {
 546                         afc_cfg |= 0xF;
 547                         flow |= 0xFFFF0000;
 548                 } else {
 549                         afc_cfg &= ~0xF;
 550                 }
 551
 552                 netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
 553                           rx_pause ? "enabled" : "disabled",
 554                           tx_pause ? "enabled" : "disabled");
 555         } else {
 556                 netif_dbg(dev, link, dev->net, "half duplex\n");
 557                 afc_cfg |= 0xF;
 558         }
 559
 560         ret = smsc95xx_write_reg(dev, FLOW, flow);
 561         if (ret < 0)
 562                 return ret;
 563
 564         return smsc95xx_write_reg(dev, AFC_CFG, afc_cfg);
 565 }
 566
 567 static void smsc95xx_mac_update_fullduplex(struct usbnet *dev)
 568 {
 569         struct smsc95xx_priv *pdata = dev->driver_priv;
 570         unsigned long flags;
 571         int ret;
 572
 573         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 574         if (pdata->phydev->duplex != DUPLEX_FULL) {
 575                 pdata->mac_cr &= ~MAC_CR_FDPX_;
 576                 pdata->mac_cr |= MAC_CR_RCVOWN_;
 577         } else {
 578                 pdata->mac_cr &= ~MAC_CR_RCVOWN_;
 579                 pdata->mac_cr |= MAC_CR_FDPX_;
 580         }
 581         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 582
 583         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 584         if (ret < 0) {
 585                 if (ret != -ENODEV)
 586                         netdev_warn(dev->net,
 587                                     "Error updating MAC full duplex mode\n");
 588                 return;
 589         }
 590
 591         ret = smsc95xx_phy_update_flowcontrol(dev);
 592         if (ret < 0)
 593                 netdev_warn(dev->net, "Error updating PHY flow control\n");
 594 }
 595
 596 static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
 597 {
 598         u32 intdata;
 599
 600         if (urb->actual_length != 4) {
 601                 netdev_warn(dev->net, "unexpected urb length %d\n",
 602                             urb->actual_length);
 603                 return;
 604         }
 605
 606         intdata = get_unaligned_le32(urb->transfer_buffer);
 607         netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
 608
 609         if (intdata & INT_ENP_PHY_INT_)
 610                 ;
 611         else
 612                 netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
 613                             intdata);
 614 }
 615
 616 /* Enable or disable Tx & Rx checksum offload engines */
 617 static int smsc95xx_set_features(struct net_device *netdev,
 618         netdev_features_t features)
 619 {
 620         struct usbnet *dev = netdev_priv(netdev);
 621         u32 read_buf;
 622         int ret;
 623
 624         ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
 625         if (ret < 0)
 626                 return ret;
 627
 628         if (features & NETIF_F_IP_CSUM)
 629                 read_buf |= Tx_COE_EN_;
 630         else
 631                 read_buf &= ~Tx_COE_EN_;
 632
 633         if (features & NETIF_F_RXCSUM)
 634                 read_buf |= Rx_COE_EN_;
 635         else
 636                 read_buf &= ~Rx_COE_EN_;
 637
 638         ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
 639         if (ret < 0)
 640                 return ret;
 641
 642         netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
 643         return 0;
 644 }
 645
 646 static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
 647 {
 648         return MAX_EEPROM_SIZE;
 649 }
 650
 651 static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
 652                                        struct ethtool_eeprom *ee, u8 *data)
 653 {
 654         struct usbnet *dev = netdev_priv(netdev);
 655
 656         ee->magic = LAN95XX_EEPROM_MAGIC;
 657
 658         return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
 659 }
 660
 661 static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
 662                                        struct ethtool_eeprom *ee, u8 *data)
 663 {
 664         struct usbnet *dev = netdev_priv(netdev);
 665
 666         if (ee->magic != LAN95XX_EEPROM_MAGIC) {
 667                 netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
 668                             ee->magic);
 669                 return -EINVAL;
 670         }
 671
 672         return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
 673 }
 674
 675 static int smsc95xx_ethtool_getregslen(struct net_device *netdev)
 676 {
 677         /* all smsc95xx registers */
 678         return COE_CR - ID_REV + sizeof(u32);
 679 }
 680
 681 static void
 682 smsc95xx_ethtool_getregs(struct net_device *netdev, struct ethtool_regs *regs,
 683                          void *buf)
 684 {
 685         struct usbnet *dev = netdev_priv(netdev);
 686         unsigned int i, j;
 687         int retval;
 688         u32 *data = buf;
 689
 690         retval = smsc95xx_read_reg(dev, ID_REV, &regs->version);
 691         if (retval < 0) {
 692                 netdev_warn(netdev, "REGS: cannot read ID_REV\n");
 693                 return;
 694         }
 695
 696         for (i = ID_REV, j = 0; i <= COE_CR; i += (sizeof(u32)), j++) {
 697                 retval = smsc95xx_read_reg(dev, i, &data[j]);
 698                 if (retval < 0) {
 699                         netdev_warn(netdev, "REGS: cannot read reg[%x]\n", i);
 700                         return;
 701                 }
 702         }
 703 }
 704
 705 static void smsc95xx_ethtool_get_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
 711         wolinfo->supported = SUPPORTED_WAKE;
 712         wolinfo->wolopts = pdata->wolopts;
 713 }
 714
 715 static int smsc95xx_ethtool_set_wol(struct net_device *net,
 716                                     struct ethtool_wolinfo *wolinfo)
 717 {
 718         struct usbnet *dev = netdev_priv(net);
 719         struct smsc95xx_priv *pdata = dev->driver_priv;
 720         int ret;
 721
 722         if (wolinfo->wolopts & ~SUPPORTED_WAKE)
 723                 return -EINVAL;
 724
 725         pdata->wolopts = wolinfo->wolopts & SUPPORTED_WAKE;
 726
 727         ret = device_set_wakeup_enable(&dev->udev->dev, pdata->wolopts);
 728         if (ret < 0)
 729                 netdev_warn(dev->net, "device_set_wakeup_enable error %d\n", ret);
 730
 731         return ret;
 732 }
 733
 734 static u32 smsc95xx_get_link(struct net_device *net)
 735 {
 736         phy_read_status(net->phydev);
 737         return net->phydev->link;
 738 }
 739
 740 static const struct ethtool_ops smsc95xx_ethtool_ops = {
 741         .get_link       = smsc95xx_get_link,
 742         .nway_reset     = phy_ethtool_nway_reset,
 743         .get_drvinfo    = usbnet_get_drvinfo,
 744         .get_msglevel   = usbnet_get_msglevel,
 745         .set_msglevel   = usbnet_set_msglevel,
 746         .get_eeprom_len = smsc95xx_ethtool_get_eeprom_len,
 747         .get_eeprom     = smsc95xx_ethtool_get_eeprom,
 748         .set_eeprom     = smsc95xx_ethtool_set_eeprom,
 749         .get_regs_len   = smsc95xx_ethtool_getregslen,
 750         .get_regs       = smsc95xx_ethtool_getregs,
 751         .get_wol        = smsc95xx_ethtool_get_wol,
 752         .set_wol        = smsc95xx_ethtool_set_wol,
 753         .get_link_ksettings     = phy_ethtool_get_link_ksettings,
 754         .set_link_ksettings     = phy_ethtool_set_link_ksettings,
 755         .get_ts_info    = ethtool_op_get_ts_info,
 756 };
 757
 758 static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
 759 {
 760         if (!netif_running(netdev))
 761                 return -EINVAL;
 762
 763         return phy_mii_ioctl(netdev->phydev, rq, cmd);
 764 }
 765
 766 static void smsc95xx_init_mac_address(struct usbnet *dev)
 767 {
 768         /* maybe the boot loader passed the MAC address in devicetree */
 769         if (!eth_platform_get_mac_address(&dev->udev->dev,
 770                         dev->net->dev_addr)) {
 771                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 772                         /* device tree values are valid so use them */
 773                         netif_dbg(dev, ifup, dev->net, "MAC address read from the device tree\n");
 774                         return;
 775                 }
 776         }
 777
 778         /* try reading mac address from EEPROM */
 779         if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
 780                         dev->net->dev_addr) == 0) {
 781                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 782                         /* eeprom values are valid so use them */
 783                         netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
 784                         return;
 785                 }
 786         }
 787
 788         /* no useful static MAC address found. generate a random one */
 789         eth_hw_addr_random(dev->net);
 790         netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
 791 }
 792
 793 static int smsc95xx_set_mac_address(struct usbnet *dev)
 794 {
 795         u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
 796                 dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
 797         u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
 798         int ret;
 799
 800         ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
 801         if (ret < 0)
 802                 return ret;
 803
 804         return smsc95xx_write_reg(dev, ADDRH, addr_hi);
 805 }
 806
 807 /* starts the TX path */
 808 static int smsc95xx_start_tx_path(struct usbnet *dev)
 809 {
 810         struct smsc95xx_priv *pdata = dev->driver_priv;
 811         unsigned long flags;
 812         int ret;
 813
 814         /* Enable Tx at MAC */
 815         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 816         pdata->mac_cr |= MAC_CR_TXEN_;
 817         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 818
 819         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 820         if (ret < 0)
 821                 return ret;
 822
 823         /* Enable Tx at SCSRs */
 824         return smsc95xx_write_reg(dev, TX_CFG, TX_CFG_ON_);
 825 }
 826
 827 /* Starts the Receive path */
 828 static int smsc95xx_start_rx_path(struct usbnet *dev, int in_pm)
 829 {
 830         struct smsc95xx_priv *pdata = dev->driver_priv;
 831         unsigned long flags;
 832
 833         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 834         pdata->mac_cr |= MAC_CR_RXEN_;
 835         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 836
 837         return __smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr, in_pm);
 838 }
 839
 840 static int smsc95xx_reset(struct usbnet *dev)
 841 {
 842         struct smsc95xx_priv *pdata = dev->driver_priv;
 843         u32 read_buf, write_buf, burst_cap;
 844         int ret = 0, timeout;
 845
 846         netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
 847
 848         ret = smsc95xx_write_reg(dev, HW_CFG, HW_CFG_LRST_);
 849         if (ret < 0)
 850                 return ret;
 851
 852         timeout = 0;
 853         do {
 854                 msleep(10);
 855                 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 856                 if (ret < 0)
 857                         return ret;
 858                 timeout++;
 859         } while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
 860
 861         if (timeout >= 100) {
 862                 netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
 863                 return ret;
 864         }
 865
 866         ret = smsc95xx_write_reg(dev, PM_CTRL, PM_CTL_PHY_RST_);
 867         if (ret < 0)
 868                 return ret;
 869
 870         timeout = 0;
 871         do {
 872                 msleep(10);
 873                 ret = smsc95xx_read_reg(dev, PM_CTRL, &read_buf);
 874                 if (ret < 0)
 875                         return ret;
 876                 timeout++;
 877         } while ((read_buf & PM_CTL_PHY_RST_) && (timeout < 100));
 878
 879         if (timeout >= 100) {
 880                 netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
 881                 return ret;
 882         }
 883
 884         ret = smsc95xx_set_mac_address(dev);
 885         if (ret < 0)
 886                 return ret;
 887
 888         netif_dbg(dev, ifup, dev->net, "MAC Address: %pM\n",
 889                   dev->net->dev_addr);
 890
 891         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 892         if (ret < 0)
 893                 return ret;
 894
 895         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x\n",
 896                   read_buf);
 897
 898         read_buf |= HW_CFG_BIR_;
 899
 900         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 901         if (ret < 0)
 902                 return ret;
 903
 904         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 905         if (ret < 0)
 906                 return ret;
 907
 908         netif_dbg(dev, ifup, dev->net,
 909                   "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
 910                   read_buf);
 911
 912         if (!turbo_mode) {
 913                 burst_cap = 0;
 914                 dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
 915         } else if (dev->udev->speed == USB_SPEED_HIGH) {
 916                 burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
 917                 dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
 918         } else {
 919                 burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
 920                 dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
 921         }
 922
 923         netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld\n",
 924                   (ulong)dev->rx_urb_size);
 925
 926         ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
 927         if (ret < 0)
 928                 return ret;
 929
 930         ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
 931         if (ret < 0)
 932                 return ret;
 933
 934         netif_dbg(dev, ifup, dev->net,
 935                   "Read Value from BURST_CAP after writing: 0x%08x\n",
 936                   read_buf);
 937
 938         ret = smsc95xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
 939         if (ret < 0)
 940                 return ret;
 941
 942         ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
 943         if (ret < 0)
 944                 return ret;
 945
 946         netif_dbg(dev, ifup, dev->net,
 947                   "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
 948                   read_buf);
 949
 950         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 951         if (ret < 0)
 952                 return ret;
 953
 954         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG: 0x%08x\n",
 955                   read_buf);
 956
 957         if (turbo_mode)
 958                 read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
 959
 960         read_buf &= ~HW_CFG_RXDOFF_;
 961
 962         /* set Rx data offset=2, Make IP header aligns on word boundary. */
 963         read_buf |= NET_IP_ALIGN << 9;
 964
 965         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 966         if (ret < 0)
 967                 return ret;
 968
 969         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 970         if (ret < 0)
 971                 return ret;
 972
 973         netif_dbg(dev, ifup, dev->net,
 974                   "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
 975
 976         ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
 977         if (ret < 0)
 978                 return ret;
 979
 980         ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
 981         if (ret < 0)
 982                 return ret;
 983         netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
 984
 985         /* Configure GPIO pins as LED outputs */
 986         write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
 987                 LED_GPIO_CFG_FDX_LED;
 988         ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
 989         if (ret < 0)
 990                 return ret;
 991
 992         /* Init Tx */
 993         ret = smsc95xx_write_reg(dev, FLOW, 0);
 994         if (ret < 0)
 995                 return ret;
 996
 997         ret = smsc95xx_write_reg(dev, AFC_CFG, AFC_CFG_DEFAULT);
 998         if (ret < 0)
 999                 return ret;
1000
1001         /* Don't need mac_cr_lock during initialisation */
1002         ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
1003         if (ret < 0)
1004                 return ret;
1005
1006         /* Init Rx */
1007         /* Set Vlan */
1008         ret = smsc95xx_write_reg(dev, VLAN1, (u32)ETH_P_8021Q);
1009         if (ret < 0)
1010                 return ret;
1011
1012         /* Enable or disable checksum offload engines */
1013         ret = smsc95xx_set_features(dev->net, dev->net->features);
1014         if (ret < 0) {
1015                 netdev_warn(dev->net, "Failed to set checksum offload features\n");
1016                 return ret;
1017         }
1018
1019         smsc95xx_set_multicast(dev->net);
1020
1021         ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
1022         if (ret < 0)
1023                 return ret;
1024
1025         /* enable PHY interrupts */
1026         read_buf |= INT_EP_CTL_PHY_INT_;
1027
1028         ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
1029         if (ret < 0)
1030                 return ret;
1031
1032         ret = smsc95xx_start_tx_path(dev);
1033         if (ret < 0) {
1034                 netdev_warn(dev->net, "Failed to start TX path\n");
1035                 return ret;
1036         }
1037
1038         ret = smsc95xx_start_rx_path(dev, 0);
1039         if (ret < 0) {
1040                 netdev_warn(dev->net, "Failed to start RX path\n");
1041                 return ret;
1042         }
1043
1044         netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1045         return 0;
1046 }
1047
1048 static const struct net_device_ops smsc95xx_netdev_ops = {
1049         .ndo_open               = usbnet_open,
1050         .ndo_stop               = usbnet_stop,
1051         .ndo_start_xmit         = usbnet_start_xmit,
1052         .ndo_tx_timeout         = usbnet_tx_timeout,
1053         .ndo_change_mtu         = usbnet_change_mtu,
1054         .ndo_get_stats64        = usbnet_get_stats64,
1055         .ndo_set_mac_address    = eth_mac_addr,
1056         .ndo_validate_addr      = eth_validate_addr,
1057         .ndo_do_ioctl           = smsc95xx_ioctl,
1058         .ndo_set_rx_mode        = smsc95xx_set_multicast,
1059         .ndo_set_features       = smsc95xx_set_features,
1060 };
1061
1062 static void smsc95xx_handle_link_change(struct net_device *net)
1063 {
1064         struct usbnet *dev = netdev_priv(net);
1065
1066         phy_print_status(net->phydev);
1067         smsc95xx_mac_update_fullduplex(dev);
1068         usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1069 }
1070
1071 static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1072 {
1073         struct smsc95xx_priv *pdata;
1074         bool is_internal_phy;
1075         u32 val;
1076         int ret;
1077
1078         printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1079
1080         ret = usbnet_get_endpoints(dev, intf);
1081         if (ret < 0) {
1082                 netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1083                 return ret;
1084         }
1085
1086         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
1087         if (!pdata)
1088                 return -ENOMEM;
1089
1090         dev->driver_priv = pdata;
1091
1092         spin_lock_init(&pdata->mac_cr_lock);
1093
1094         /* LAN95xx devices do not alter the computed checksum of 0 to 0xffff.
1095          * RFC 2460, ipv6 UDP calculated checksum yields a result of zero must
1096          * be changed to 0xffff. RFC 768, ipv4 UDP computed checksum is zero,
1097          * it is transmitted as all ones. The zero transmitted checksum means
1098          * transmitter generated no checksum. Hence, enable csum offload only
1099          * for ipv4 packets.
1100          */
1101         if (DEFAULT_TX_CSUM_ENABLE)
1102                 dev->net->features |= NETIF_F_IP_CSUM;
1103         if (DEFAULT_RX_CSUM_ENABLE)
1104                 dev->net->features |= NETIF_F_RXCSUM;
1105
1106         dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1107         set_bit(EVENT_NO_IP_ALIGN, &dev->flags);
1108
1109         smsc95xx_init_mac_address(dev);
1110
1111         /* Init all registers */
1112         ret = smsc95xx_reset(dev);
1113         if (ret)
1114                 goto free_pdata;
1115
1116         pdata->mdiobus = mdiobus_alloc();
1117         if (!pdata->mdiobus) {
1118                 ret = -ENOMEM;
1119                 goto free_pdata;
1120         }
1121
1122         ret = smsc95xx_read_reg(dev, HW_CFG, &val);
1123         if (ret < 0)
1124                 goto free_mdio;
1125
1126         is_internal_phy = !(val & HW_CFG_PSEL_);
1127         if (is_internal_phy)
1128                 pdata->mdiobus->phy_mask = ~(1u << SMSC95XX_INTERNAL_PHY_ID);
1129
1130         pdata->mdiobus->priv = dev;
1131         pdata->mdiobus->read = smsc95xx_mdiobus_read;
1132         pdata->mdiobus->write = smsc95xx_mdiobus_write;
1133         pdata->mdiobus->name = "smsc95xx-mdiobus";
1134         pdata->mdiobus->parent = &dev->udev->dev;
1135
1136         snprintf(pdata->mdiobus->id, ARRAY_SIZE(pdata->mdiobus->id),
1137                  "usb-%03d:%03d", dev->udev->bus->busnum, dev->udev->devnum);
1138
1139         ret = mdiobus_register(pdata->mdiobus);
1140         if (ret) {
1141                 netdev_err(dev->net, "Could not register MDIO bus\n");
1142                 goto free_mdio;
1143         }
1144
1145         pdata->phydev = phy_find_first(pdata->mdiobus);
1146         if (!pdata->phydev) {
1147                 netdev_err(dev->net, "no PHY found\n");
1148                 ret = -ENODEV;
1149                 goto unregister_mdio;
1150         }
1151
1152         pdata->phydev->is_internal = is_internal_phy;
1153
1154         /* detect device revision as different features may be available */
1155         ret = smsc95xx_read_reg(dev, ID_REV, &val);
1156         if (ret < 0)
1157                 goto unregister_mdio;
1158
1159         val >>= 16;
1160         if ((val == ID_REV_CHIP_ID_9500A_) || (val == ID_REV_CHIP_ID_9530_) ||
1161             (val == ID_REV_CHIP_ID_89530_) || (val == ID_REV_CHIP_ID_9730_))
1162                 pdata->features = (FEATURE_8_WAKEUP_FILTERS |
1163                         FEATURE_PHY_NLP_CROSSOVER |
1164                         FEATURE_REMOTE_WAKEUP);
1165         else if (val == ID_REV_CHIP_ID_9512_)
1166                 pdata->features = FEATURE_8_WAKEUP_FILTERS;
1167
1168         dev->net->netdev_ops = &smsc95xx_netdev_ops;
1169         dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1170         dev->net->flags |= IFF_MULTICAST;
1171         dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
1172         dev->net->min_mtu = ETH_MIN_MTU;
1173         dev->net->max_mtu = ETH_DATA_LEN;
1174         dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
1175
1176         ret = phy_connect_direct(dev->net, pdata->phydev,
1177                                  &smsc95xx_handle_link_change,
1178                                  PHY_INTERFACE_MODE_MII);
1179         if (ret) {
1180                 netdev_err(dev->net, "can't attach PHY to %s\n", pdata->mdiobus->id);
1181                 goto unregister_mdio;
1182         }
1183
1184         phy_attached_info(dev->net->phydev);
1185
1186         return 0;
1187
1188 unregister_mdio:
1189         mdiobus_unregister(pdata->mdiobus);
1190
1191 free_mdio:
1192         mdiobus_free(pdata->mdiobus);
1193
1194 free_pdata:
1195         kfree(pdata);
1196         return ret;
1197 }
1198
1199 static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1200 {
1201         struct smsc95xx_priv *pdata = dev->driver_priv;
1202
1203         phy_disconnect(dev->net->phydev);
1204         mdiobus_unregister(pdata->mdiobus);
1205         mdiobus_free(pdata->mdiobus);
1206         netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1207         kfree(pdata);
1208 }
1209
1210 static int smsc95xx_start_phy(struct usbnet *dev)
1211 {
1212         phy_start(dev->net->phydev);
1213
1214         return 0;
1215 }
1216
1217 static int smsc95xx_stop(struct usbnet *dev)
1218 {
1219         if (dev->net->phydev)
1220                 phy_stop(dev->net->phydev);
1221
1222         return 0;
1223 }
1224
1225 static u32 smsc_crc(const u8 *buffer, size_t len, int filter)
1226 {
1227         u32 crc = bitrev16(crc16(0xFFFF, buffer, len));
1228         return crc << ((filter % 2) * 16);
1229 }
1230
1231 static int smsc95xx_enable_phy_wakeup_interrupts(struct usbnet *dev, u16 mask)
1232 {
1233         int ret;
1234
1235         netdev_dbg(dev->net, "enabling PHY wakeup interrupts\n");
1236
1237         /* read to clear */
1238         ret = smsc95xx_mdio_read_nopm(dev, PHY_INT_SRC);
1239         if (ret < 0)
1240                 return ret;
1241
1242         /* enable interrupt source */
1243         ret = smsc95xx_mdio_read_nopm(dev, PHY_INT_MASK);
1244         if (ret < 0)
1245                 return ret;
1246
1247         ret |= mask;
1248
1249         smsc95xx_mdio_write_nopm(dev, PHY_INT_MASK, ret);
1250
1251         return 0;
1252 }
1253
1254 static int smsc95xx_link_ok_nopm(struct usbnet *dev)
1255 {
1256         int ret;
1257
1258         /* first, a dummy read, needed to latch some MII phys */
1259         ret = smsc95xx_mdio_read_nopm(dev, MII_BMSR);
1260         if (ret < 0)
1261                 return ret;
1262
1263         ret = smsc95xx_mdio_read_nopm(dev, MII_BMSR);
1264         if (ret < 0)
1265                 return ret;
1266
1267         return !!(ret & BMSR_LSTATUS);
1268 }
1269
1270 static int smsc95xx_enter_suspend0(struct usbnet *dev)
1271 {
1272         struct smsc95xx_priv *pdata = dev->driver_priv;
1273         u32 val;
1274         int ret;
1275
1276         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1277         if (ret < 0)
1278                 return ret;
1279
1280         val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
1281         val |= PM_CTL_SUS_MODE_0;
1282
1283         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1284         if (ret < 0)
1285                 return ret;
1286
1287         /* clear wol status */
1288         val &= ~PM_CTL_WUPS_;
1289         val |= PM_CTL_WUPS_WOL_;
1290
1291         /* enable energy detection */
1292         if (pdata->wolopts & WAKE_PHY)
1293                 val |= PM_CTL_WUPS_ED_;
1294
1295         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1296         if (ret < 0)
1297                 return ret;
1298
1299         /* read back PM_CTRL */
1300         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1301         if (ret < 0)
1302                 return ret;
1303
1304         pdata->suspend_flags |= SUSPEND_SUSPEND0;
1305
1306         return 0;
1307 }
1308
1309 static int smsc95xx_enter_suspend1(struct usbnet *dev)
1310 {
1311         struct smsc95xx_priv *pdata = dev->driver_priv;
1312         u32 val;
1313         int ret;
1314
1315         /* reconfigure link pulse detection timing for
1316          * compatibility with non-standard link partners
1317          */
1318         if (pdata->features & FEATURE_PHY_NLP_CROSSOVER)
1319                 smsc95xx_mdio_write_nopm(dev, PHY_EDPD_CONFIG,
1320                                          PHY_EDPD_CONFIG_DEFAULT);
1321
1322         /* enable energy detect power-down mode */
1323         ret = smsc95xx_mdio_read_nopm(dev, PHY_MODE_CTRL_STS);
1324         if (ret < 0)
1325                 return ret;
1326
1327         ret |= MODE_CTRL_STS_EDPWRDOWN_;
1328
1329         smsc95xx_mdio_write_nopm(dev, PHY_MODE_CTRL_STS, ret);
1330
1331         /* enter SUSPEND1 mode */
1332         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1333         if (ret < 0)
1334                 return ret;
1335
1336         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1337         val |= PM_CTL_SUS_MODE_1;
1338
1339         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1340         if (ret < 0)
1341                 return ret;
1342
1343         /* clear wol status, enable energy detection */
1344         val &= ~PM_CTL_WUPS_;
1345         val |= (PM_CTL_WUPS_ED_ | PM_CTL_ED_EN_);
1346
1347         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1348         if (ret < 0)
1349                 return ret;
1350
1351         pdata->suspend_flags |= SUSPEND_SUSPEND1;
1352
1353         return 0;
1354 }
1355
1356 static int smsc95xx_enter_suspend2(struct usbnet *dev)
1357 {
1358         struct smsc95xx_priv *pdata = dev->driver_priv;
1359         u32 val;
1360         int ret;
1361
1362         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1363         if (ret < 0)
1364                 return ret;
1365
1366         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1367         val |= PM_CTL_SUS_MODE_2;
1368
1369         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1370         if (ret < 0)
1371                 return ret;
1372
1373         pdata->suspend_flags |= SUSPEND_SUSPEND2;
1374
1375         return 0;
1376 }
1377
1378 static int smsc95xx_enter_suspend3(struct usbnet *dev)
1379 {
1380         struct smsc95xx_priv *pdata = dev->driver_priv;
1381         u32 val;
1382         int ret;
1383
1384         ret = smsc95xx_read_reg_nopm(dev, RX_FIFO_INF, &val);
1385         if (ret < 0)
1386                 return ret;
1387
1388         if (val & RX_FIFO_INF_USED_) {
1389                 netdev_info(dev->net, "rx fifo not empty in autosuspend\n");
1390                 return -EBUSY;
1391         }
1392
1393         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1394         if (ret < 0)
1395                 return ret;
1396
1397         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1398         val |= PM_CTL_SUS_MODE_3 | PM_CTL_RES_CLR_WKP_STS;
1399
1400         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1401         if (ret < 0)
1402                 return ret;
1403
1404         /* clear wol status */
1405         val &= ~PM_CTL_WUPS_;
1406         val |= PM_CTL_WUPS_WOL_;
1407
1408         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1409         if (ret < 0)
1410                 return ret;
1411
1412         pdata->suspend_flags |= SUSPEND_SUSPEND3;
1413
1414         return 0;
1415 }
1416
1417 static int smsc95xx_autosuspend(struct usbnet *dev, u32 link_up)
1418 {
1419         struct smsc95xx_priv *pdata = dev->driver_priv;
1420         int ret;
1421
1422         if (!netif_running(dev->net)) {
1423                 /* interface is ifconfig down so fully power down hw */
1424                 netdev_dbg(dev->net, "autosuspend entering SUSPEND2\n");
1425                 return smsc95xx_enter_suspend2(dev);
1426         }
1427
1428         if (!link_up) {
1429                 /* link is down so enter EDPD mode, but only if device can
1430                  * reliably resume from it.  This check should be redundant
1431                  * as current FEATURE_REMOTE_WAKEUP parts also support
1432                  * FEATURE_PHY_NLP_CROSSOVER but it's included for clarity */
1433                 if (!(pdata->features & FEATURE_PHY_NLP_CROSSOVER)) {
1434                         netdev_warn(dev->net, "EDPD not supported\n");
1435                         return -EBUSY;
1436                 }
1437
1438                 netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n");
1439
1440                 /* enable PHY wakeup events for if cable is attached */
1441                 ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1442                         PHY_INT_MASK_ANEG_COMP_);
1443                 if (ret < 0) {
1444                         netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1445                         return ret;
1446                 }
1447
1448                 netdev_info(dev->net, "entering SUSPEND1 mode\n");
1449                 return smsc95xx_enter_suspend1(dev);
1450         }
1451
1452         /* enable PHY wakeup events so we remote wakeup if cable is pulled */
1453         ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1454                 PHY_INT_MASK_LINK_DOWN_);
1455         if (ret < 0) {
1456                 netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1457                 return ret;
1458         }
1459
1460         netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n");
1461         return smsc95xx_enter_suspend3(dev);
1462 }
1463
1464 static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
1465 {
1466         struct usbnet *dev = usb_get_intfdata(intf);
1467         struct smsc95xx_priv *pdata = dev->driver_priv;
1468         u32 val, link_up;
1469         int ret;
1470
1471         ret = usbnet_suspend(intf, message);
1472         if (ret < 0) {
1473                 netdev_warn(dev->net, "usbnet_suspend error\n");
1474                 return ret;
1475         }
1476
1477         if (pdata->suspend_flags) {
1478                 netdev_warn(dev->net, "error during last resume\n");
1479                 pdata->suspend_flags = 0;
1480         }
1481
1482         /* determine if link is up using only _nopm functions */
1483         link_up = smsc95xx_link_ok_nopm(dev);
1484
1485         if (message.event == PM_EVENT_AUTO_SUSPEND &&
1486             (pdata->features & FEATURE_REMOTE_WAKEUP)) {
1487                 ret = smsc95xx_autosuspend(dev, link_up);
1488                 goto done;
1489         }
1490
1491         /* if we get this far we're not autosuspending */
1492         /* if no wol options set, or if link is down and we're not waking on
1493          * PHY activity, enter lowest power SUSPEND2 mode
1494          */
1495         if (!(pdata->wolopts & SUPPORTED_WAKE) ||
1496                 !(link_up || (pdata->wolopts & WAKE_PHY))) {
1497                 netdev_info(dev->net, "entering SUSPEND2 mode\n");
1498
1499                 /* disable energy detect (link up) & wake up events */
1500                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1501                 if (ret < 0)
1502                         goto done;
1503
1504                 val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
1505
1506                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1507                 if (ret < 0)
1508                         goto done;
1509
1510                 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1511                 if (ret < 0)
1512                         goto done;
1513
1514                 val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
1515
1516                 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1517                 if (ret < 0)
1518                         goto done;
1519
1520                 ret = smsc95xx_enter_suspend2(dev);
1521                 goto done;
1522         }
1523
1524         if (pdata->wolopts & WAKE_PHY) {
1525                 ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1526                         (PHY_INT_MASK_ANEG_COMP_ | PHY_INT_MASK_LINK_DOWN_));
1527                 if (ret < 0) {
1528                         netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1529                         goto done;
1530                 }
1531
1532                 /* if link is down then configure EDPD and enter SUSPEND1,
1533                  * otherwise enter SUSPEND0 below
1534                  */
1535                 if (!link_up) {
1536                         netdev_info(dev->net, "entering SUSPEND1 mode\n");
1537                         ret = smsc95xx_enter_suspend1(dev);
1538                         goto done;
1539                 }
1540         }
1541
1542         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1543                 u32 *filter_mask = kcalloc(32, sizeof(u32), GFP_KERNEL);
1544                 u32 command[2];
1545                 u32 offset[2];
1546                 u32 crc[4];
1547                 int wuff_filter_count =
1548                         (pdata->features & FEATURE_8_WAKEUP_FILTERS) ?
1549                         LAN9500A_WUFF_NUM : LAN9500_WUFF_NUM;
1550                 int i, filter = 0;
1551
1552                 if (!filter_mask) {
1553                         netdev_warn(dev->net, "Unable to allocate filter_mask\n");
1554                         ret = -ENOMEM;
1555                         goto done;
1556                 }
1557
1558                 memset(command, 0, sizeof(command));
1559                 memset(offset, 0, sizeof(offset));
1560                 memset(crc, 0, sizeof(crc));
1561
1562                 if (pdata->wolopts & WAKE_BCAST) {
1563                         const u8 bcast[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
1564                         netdev_info(dev->net, "enabling broadcast detection\n");
1565                         filter_mask[filter * 4] = 0x003F;
1566                         filter_mask[filter * 4 + 1] = 0x00;
1567                         filter_mask[filter * 4 + 2] = 0x00;
1568                         filter_mask[filter * 4 + 3] = 0x00;
1569                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1570                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1571                         crc[filter/2] |= smsc_crc(bcast, 6, filter);
1572                         filter++;
1573                 }
1574
1575                 if (pdata->wolopts & WAKE_MCAST) {
1576                         const u8 mcast[] = {0x01, 0x00, 0x5E};
1577                         netdev_info(dev->net, "enabling multicast detection\n");
1578                         filter_mask[filter * 4] = 0x0007;
1579                         filter_mask[filter * 4 + 1] = 0x00;
1580                         filter_mask[filter * 4 + 2] = 0x00;
1581                         filter_mask[filter * 4 + 3] = 0x00;
1582                         command[filter/4] |= 0x09UL << ((filter % 4) * 8);
1583                         offset[filter/4] |= 0x00  << ((filter % 4) * 8);
1584                         crc[filter/2] |= smsc_crc(mcast, 3, filter);
1585                         filter++;
1586                 }
1587
1588                 if (pdata->wolopts & WAKE_ARP) {
1589                         const u8 arp[] = {0x08, 0x06};
1590                         netdev_info(dev->net, "enabling ARP detection\n");
1591                         filter_mask[filter * 4] = 0x0003;
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] |= 0x05UL << ((filter % 4) * 8);
1596                         offset[filter/4] |= 0x0C << ((filter % 4) * 8);
1597                         crc[filter/2] |= smsc_crc(arp, 2, filter);
1598                         filter++;
1599                 }
1600
1601                 if (pdata->wolopts & WAKE_UCAST) {
1602                         netdev_info(dev->net, "enabling unicast detection\n");
1603                         filter_mask[filter * 4] = 0x003F;
1604                         filter_mask[filter * 4 + 1] = 0x00;
1605                         filter_mask[filter * 4 + 2] = 0x00;
1606                         filter_mask[filter * 4 + 3] = 0x00;
1607                         command[filter/4] |= 0x01UL << ((filter % 4) * 8);
1608                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1609                         crc[filter/2] |= smsc_crc(dev->net->dev_addr, ETH_ALEN, filter);
1610                         filter++;
1611                 }
1612
1613                 for (i = 0; i < (wuff_filter_count * 4); i++) {
1614                         ret = smsc95xx_write_reg_nopm(dev, WUFF, filter_mask[i]);
1615                         if (ret < 0) {
1616                                 kfree(filter_mask);
1617                                 goto done;
1618                         }
1619                 }
1620                 kfree(filter_mask);
1621
1622                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1623                         ret = smsc95xx_write_reg_nopm(dev, WUFF, command[i]);
1624                         if (ret < 0)
1625                                 goto done;
1626                 }
1627
1628                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1629                         ret = smsc95xx_write_reg_nopm(dev, WUFF, offset[i]);
1630                         if (ret < 0)
1631                                 goto done;
1632                 }
1633
1634                 for (i = 0; i < (wuff_filter_count / 2); i++) {
1635                         ret = smsc95xx_write_reg_nopm(dev, WUFF, crc[i]);
1636                         if (ret < 0)
1637                                 goto done;
1638                 }
1639
1640                 /* clear any pending pattern match packet status */
1641                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1642                 if (ret < 0)
1643                         goto done;
1644
1645                 val |= WUCSR_WUFR_;
1646
1647                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1648                 if (ret < 0)
1649                         goto done;
1650         }
1651
1652         if (pdata->wolopts & WAKE_MAGIC) {
1653                 /* clear any pending magic packet status */
1654                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1655                 if (ret < 0)
1656                         goto done;
1657
1658                 val |= WUCSR_MPR_;
1659
1660                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1661                 if (ret < 0)
1662                         goto done;
1663         }
1664
1665         /* enable/disable wakeup sources */
1666         ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1667         if (ret < 0)
1668                 goto done;
1669
1670         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1671                 netdev_info(dev->net, "enabling pattern match wakeup\n");
1672                 val |= WUCSR_WAKE_EN_;
1673         } else {
1674                 netdev_info(dev->net, "disabling pattern match wakeup\n");
1675                 val &= ~WUCSR_WAKE_EN_;
1676         }
1677
1678         if (pdata->wolopts & WAKE_MAGIC) {
1679                 netdev_info(dev->net, "enabling magic packet wakeup\n");
1680                 val |= WUCSR_MPEN_;
1681         } else {
1682                 netdev_info(dev->net, "disabling magic packet wakeup\n");
1683                 val &= ~WUCSR_MPEN_;
1684         }
1685
1686         ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1687         if (ret < 0)
1688                 goto done;
1689
1690         /* enable wol wakeup source */
1691         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1692         if (ret < 0)
1693                 goto done;
1694
1695         val |= PM_CTL_WOL_EN_;
1696
1697         /* phy energy detect wakeup source */
1698         if (pdata->wolopts & WAKE_PHY)
1699                 val |= PM_CTL_ED_EN_;
1700
1701         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1702         if (ret < 0)
1703                 goto done;
1704
1705         /* enable receiver to enable frame reception */
1706         smsc95xx_start_rx_path(dev, 1);
1707
1708         /* some wol options are enabled, so enter SUSPEND0 */
1709         netdev_info(dev->net, "entering SUSPEND0 mode\n");
1710         ret = smsc95xx_enter_suspend0(dev);
1711
1712 done:
1713         /*
1714          * TODO: resume() might need to handle the suspend failure
1715          * in system sleep
1716          */
1717         if (ret && PMSG_IS_AUTO(message))
1718                 usbnet_resume(intf);
1719
1720         return ret;
1721 }
1722
1723 static int smsc95xx_resume(struct usb_interface *intf)
1724 {
1725         struct usbnet *dev = usb_get_intfdata(intf);
1726         struct smsc95xx_priv *pdata;
1727         u8 suspend_flags;
1728         int ret;
1729         u32 val;
1730
1731         BUG_ON(!dev);
1732         pdata = dev->driver_priv;
1733         suspend_flags = pdata->suspend_flags;
1734
1735         netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags);
1736
1737         /* do this first to ensure it's cleared even in error case */
1738         pdata->suspend_flags = 0;
1739
1740         if (suspend_flags & SUSPEND_ALLMODES) {
1741                 /* clear wake-up sources */
1742                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1743                 if (ret < 0)
1744                         return ret;
1745
1746                 val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
1747
1748                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1749                 if (ret < 0)
1750                         return ret;
1751
1752                 /* clear wake-up status */
1753                 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1754                 if (ret < 0)
1755                         return ret;
1756
1757                 val &= ~PM_CTL_WOL_EN_;
1758                 val |= PM_CTL_WUPS_;
1759
1760                 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1761                 if (ret < 0)
1762                         return ret;
1763         }
1764
1765         ret = usbnet_resume(intf);
1766         if (ret < 0)
1767                 netdev_warn(dev->net, "usbnet_resume error\n");
1768
1769         phy_init_hw(pdata->phydev);
1770         return ret;
1771 }
1772
1773 static int smsc95xx_reset_resume(struct usb_interface *intf)
1774 {
1775         struct usbnet *dev = usb_get_intfdata(intf);
1776         int ret;
1777
1778         ret = smsc95xx_reset(dev);
1779         if (ret < 0)
1780                 return ret;
1781
1782         return smsc95xx_resume(intf);
1783 }
1784
1785 static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1786 {
1787         skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
1788         skb->ip_summed = CHECKSUM_COMPLETE;
1789         skb_trim(skb, skb->len - 2);
1790 }
1791
1792 static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1793 {
1794         /* This check is no longer done by usbnet */
1795         if (skb->len < dev->net->hard_header_len)
1796                 return 0;
1797
1798         while (skb->len > 0) {
1799                 u32 header, align_count;
1800                 struct sk_buff *ax_skb;
1801                 unsigned char *packet;
1802                 u16 size;
1803
1804                 header = get_unaligned_le32(skb->data);
1805                 skb_pull(skb, 4 + NET_IP_ALIGN);
1806                 packet = skb->data;
1807
1808                 /* get the packet length */
1809                 size = (u16)((header & RX_STS_FL_) >> 16);
1810                 align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1811
1812                 if (unlikely(header & RX_STS_ES_)) {
1813                         netif_dbg(dev, rx_err, dev->net,
1814                                   "Error header=0x%08x\n", header);
1815                         dev->net->stats.rx_errors++;
1816                         dev->net->stats.rx_dropped++;
1817
1818                         if (header & RX_STS_CRC_) {
1819                                 dev->net->stats.rx_crc_errors++;
1820                         } else {
1821                                 if (header & (RX_STS_TL_ | RX_STS_RF_))
1822                                         dev->net->stats.rx_frame_errors++;
1823
1824                                 if ((header & RX_STS_LE_) &&
1825                                         (!(header & RX_STS_FT_)))
1826                                         dev->net->stats.rx_length_errors++;
1827                         }
1828                 } else {
1829                         /* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1830                         if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1831                                 netif_dbg(dev, rx_err, dev->net,
1832                                           "size err header=0x%08x\n", header);
1833                                 return 0;
1834                         }
1835
1836                         /* last frame in this batch */
1837                         if (skb->len == size) {
1838                                 if (dev->net->features & NETIF_F_RXCSUM)
1839                                         smsc95xx_rx_csum_offload(skb);
1840                                 skb_trim(skb, skb->len - 4); /* remove fcs */
1841                                 skb->truesize = size + sizeof(struct sk_buff);
1842
1843                                 return 1;
1844                         }
1845
1846                         ax_skb = skb_clone(skb, GFP_ATOMIC);
1847                         if (unlikely(!ax_skb)) {
1848                                 netdev_warn(dev->net, "Error allocating skb\n");
1849                                 return 0;
1850                         }
1851
1852                         ax_skb->len = size;
1853                         ax_skb->data = packet;
1854                         skb_set_tail_pointer(ax_skb, size);
1855
1856                         if (dev->net->features & NETIF_F_RXCSUM)
1857                                 smsc95xx_rx_csum_offload(ax_skb);
1858                         skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1859                         ax_skb->truesize = size + sizeof(struct sk_buff);
1860
1861                         usbnet_skb_return(dev, ax_skb);
1862                 }
1863
1864                 skb_pull(skb, size);
1865
1866                 /* padding bytes before the next frame starts */
1867                 if (skb->len)
1868                         skb_pull(skb, align_count);
1869         }
1870
1871         return 1;
1872 }
1873
1874 static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1875 {
1876         u16 low_16 = (u16)skb_checksum_start_offset(skb);
1877         u16 high_16 = low_16 + skb->csum_offset;
1878         return (high_16 << 16) | low_16;
1879 }
1880
1881 /* The TX CSUM won't work if the checksum lies in the last 4 bytes of the
1882  * transmission. This is fairly unlikely, only seems to trigger with some
1883  * short TCP ACK packets sent.
1884  *
1885  * Note, this calculation should probably check for the alignment of the
1886  * data as well, but a straight check for csum being in the last four bytes
1887  * of the packet should be ok for now.
1888  */
1889 static bool smsc95xx_can_tx_checksum(struct sk_buff *skb)
1890 {
1891        unsigned int len = skb->len - skb_checksum_start_offset(skb);
1892
1893        if (skb->len <= 45)
1894                return false;
1895        return skb->csum_offset < (len - (4 + 1));
1896 }
1897
1898 static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1899                                          struct sk_buff *skb, gfp_t flags)
1900 {
1901         bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
1902         int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
1903         u32 tx_cmd_a, tx_cmd_b;
1904         void *ptr;
1905
1906         /* We do not advertise SG, so skbs should be already linearized */
1907         BUG_ON(skb_shinfo(skb)->nr_frags);
1908
1909         /* Make writable and expand header space by overhead if required */
1910         if (skb_cow_head(skb, overhead)) {
1911                 /* Must deallocate here as returning NULL to indicate error
1912                  * means the skb won't be deallocated in the caller.
1913                  */
1914                 dev_kfree_skb_any(skb);
1915                 return NULL;
1916         }
1917
1918         tx_cmd_b = (u32)skb->len;
1919         tx_cmd_a = tx_cmd_b | TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
1920
1921         if (csum) {
1922                 if (!smsc95xx_can_tx_checksum(skb)) {
1923                         /* workaround - hardware tx checksum does not work
1924                          * properly with extremely small packets */
1925                         long csstart = skb_checksum_start_offset(skb);
1926                         __wsum calc = csum_partial(skb->data + csstart,
1927                                 skb->len - csstart, 0);
1928                         *((__sum16 *)(skb->data + csstart
1929                                 + skb->csum_offset)) = csum_fold(calc);
1930
1931                         csum = false;
1932                 } else {
1933                         u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
1934                         ptr = skb_push(skb, 4);
1935                         put_unaligned_le32(csum_preamble, ptr);
1936
1937                         tx_cmd_a += 4;
1938                         tx_cmd_b += 4;
1939                         tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
1940                 }
1941         }
1942
1943         ptr = skb_push(skb, 8);
1944         put_unaligned_le32(tx_cmd_a, ptr);
1945         put_unaligned_le32(tx_cmd_b, ptr+4);
1946
1947         return skb;
1948 }
1949
1950 static int smsc95xx_manage_power(struct usbnet *dev, int on)
1951 {
1952         struct smsc95xx_priv *pdata = dev->driver_priv;
1953
1954         dev->intf->needs_remote_wakeup = on;
1955
1956         if (pdata->features & FEATURE_REMOTE_WAKEUP)
1957                 return 0;
1958
1959         /* this chip revision isn't capable of remote wakeup */
1960         netdev_info(dev->net, "hardware isn't capable of remote wakeup\n");
1961
1962         if (on)
1963                 usb_autopm_get_interface_no_resume(dev->intf);
1964         else
1965                 usb_autopm_put_interface(dev->intf);
1966
1967         return 0;
1968 }
1969
1970 static const struct driver_info smsc95xx_info = {
1971         .description    = "smsc95xx USB 2.0 Ethernet",
1972         .bind           = smsc95xx_bind,
1973         .unbind         = smsc95xx_unbind,
1974         .reset          = smsc95xx_reset,
1975         .check_connect  = smsc95xx_start_phy,
1976         .stop           = smsc95xx_stop,
1977         .rx_fixup       = smsc95xx_rx_fixup,
1978         .tx_fixup       = smsc95xx_tx_fixup,
1979         .status         = smsc95xx_status,
1980         .manage_power   = smsc95xx_manage_power,
1981         .flags          = FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
1982 };
1983
1984 static const struct usb_device_id products[] = {
1985         {
1986                 /* SMSC9500 USB Ethernet Device */
1987                 USB_DEVICE(0x0424, 0x9500),
1988                 .driver_info = (unsigned long) &smsc95xx_info,
1989         },
1990         {
1991                 /* SMSC9505 USB Ethernet Device */
1992                 USB_DEVICE(0x0424, 0x9505),
1993                 .driver_info = (unsigned long) &smsc95xx_info,
1994         },
1995         {
1996                 /* SMSC9500A USB Ethernet Device */
1997                 USB_DEVICE(0x0424, 0x9E00),
1998                 .driver_info = (unsigned long) &smsc95xx_info,
1999         },
2000         {
2001                 /* SMSC9505A USB Ethernet Device */
2002                 USB_DEVICE(0x0424, 0x9E01),
2003                 .driver_info = (unsigned long) &smsc95xx_info,
2004         },
2005         {
2006                 /* SMSC9512/9514 USB Hub & Ethernet Device */
2007                 USB_DEVICE(0x0424, 0xec00),
2008                 .driver_info = (unsigned long) &smsc95xx_info,
2009         },
2010         {
2011                 /* SMSC9500 USB Ethernet Device (SAL10) */
2012                 USB_DEVICE(0x0424, 0x9900),
2013                 .driver_info = (unsigned long) &smsc95xx_info,
2014         },
2015         {
2016                 /* SMSC9505 USB Ethernet Device (SAL10) */
2017                 USB_DEVICE(0x0424, 0x9901),
2018                 .driver_info = (unsigned long) &smsc95xx_info,
2019         },
2020         {
2021                 /* SMSC9500A USB Ethernet Device (SAL10) */
2022                 USB_DEVICE(0x0424, 0x9902),
2023                 .driver_info = (unsigned long) &smsc95xx_info,
2024         },
2025         {
2026                 /* SMSC9505A USB Ethernet Device (SAL10) */
2027                 USB_DEVICE(0x0424, 0x9903),
2028                 .driver_info = (unsigned long) &smsc95xx_info,
2029         },
2030         {
2031                 /* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
2032                 USB_DEVICE(0x0424, 0x9904),
2033                 .driver_info = (unsigned long) &smsc95xx_info,
2034         },
2035         {
2036                 /* SMSC9500A USB Ethernet Device (HAL) */
2037                 USB_DEVICE(0x0424, 0x9905),
2038                 .driver_info = (unsigned long) &smsc95xx_info,
2039         },
2040         {
2041                 /* SMSC9505A USB Ethernet Device (HAL) */
2042                 USB_DEVICE(0x0424, 0x9906),
2043                 .driver_info = (unsigned long) &smsc95xx_info,
2044         },
2045         {
2046                 /* SMSC9500 USB Ethernet Device (Alternate ID) */
2047                 USB_DEVICE(0x0424, 0x9907),
2048                 .driver_info = (unsigned long) &smsc95xx_info,
2049         },
2050         {
2051                 /* SMSC9500A USB Ethernet Device (Alternate ID) */
2052                 USB_DEVICE(0x0424, 0x9908),
2053                 .driver_info = (unsigned long) &smsc95xx_info,
2054         },
2055         {
2056                 /* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
2057                 USB_DEVICE(0x0424, 0x9909),
2058                 .driver_info = (unsigned long) &smsc95xx_info,
2059         },
2060         {
2061                 /* SMSC LAN9530 USB Ethernet Device */
2062                 USB_DEVICE(0x0424, 0x9530),
2063                 .driver_info = (unsigned long) &smsc95xx_info,
2064         },
2065         {
2066                 /* SMSC LAN9730 USB Ethernet Device */
2067                 USB_DEVICE(0x0424, 0x9730),
2068                 .driver_info = (unsigned long) &smsc95xx_info,
2069         },
2070         {
2071                 /* SMSC LAN89530 USB Ethernet Device */
2072                 USB_DEVICE(0x0424, 0x9E08),
2073                 .driver_info = (unsigned long) &smsc95xx_info,
2074         },
2075         { },            /* END */
2076 };
2077 MODULE_DEVICE_TABLE(usb, products);
2078
2079 static struct usb_driver smsc95xx_driver = {
2080         .name           = "smsc95xx",
2081         .id_table       = products,
2082         .probe          = usbnet_probe,
2083         .suspend        = smsc95xx_suspend,
2084         .resume         = smsc95xx_resume,
2085         .reset_resume   = smsc95xx_reset_resume,
2086         .disconnect     = usbnet_disconnect,
2087         .disable_hub_initiated_lpm = 1,
2088         .supports_autosuspend = 1,
2089 };
2090
2091 module_usb_driver(smsc95xx_driver);
2092
2093 MODULE_AUTHOR("Nancy Lin");
2094 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
2095 MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
2096 MODULE_LICENSE("GPL");