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         struct task_struct *pm_task;
  65 };
  66
  67 static bool turbo_mode = true;
  68 module_param(turbo_mode, bool, 0644);
  69 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
  70
  71 static int __must_check __smsc95xx_read_reg(struct usbnet *dev, u32 index,
  72                                             u32 *data, int in_pm)
  73 {
  74         struct smsc95xx_priv *pdata = dev->driver_priv;
  75         u32 buf;
  76         int ret;
  77         int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
  78
  79         BUG_ON(!dev);
  80
  81         if (current != pdata->pm_task)
  82                 fn = usbnet_read_cmd;
  83         else
  84                 fn = usbnet_read_cmd_nopm;
  85
  86         ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
  87                  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  88                  0, index, &buf, 4);
  89         if (ret < 4) {
  90                 ret = ret < 0 ? ret : -ENODATA;
  91
  92                 if (ret != -ENODEV)
  93                         netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d\n",
  94                                     index, ret);
  95                 return ret;
  96         }
  97
  98         le32_to_cpus(&buf);
  99         *data = buf;
 100
 101         return ret;
 102 }
 103
 104 static int __must_check __smsc95xx_write_reg(struct usbnet *dev, u32 index,
 105                                              u32 data, int in_pm)
 106 {
 107         struct smsc95xx_priv *pdata = dev->driver_priv;
 108         u32 buf;
 109         int ret;
 110         int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
 111
 112         BUG_ON(!dev);
 113
 114         if (current != pdata->pm_task)
 115                 fn = usbnet_write_cmd;
 116         else
 117                 fn = usbnet_write_cmd_nopm;
 118
 119         buf = data;
 120         cpu_to_le32s(&buf);
 121
 122         ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
 123                  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 124                  0, index, &buf, 4);
 125         if (ret < 0 && ret != -ENODEV)
 126                 netdev_warn(dev->net, "Failed to write reg index 0x%08x: %d\n",
 127                             index, ret);
 128
 129         return ret;
 130 }
 131
 132 static int __must_check smsc95xx_read_reg_nopm(struct usbnet *dev, u32 index,
 133                                                u32 *data)
 134 {
 135         return __smsc95xx_read_reg(dev, index, data, 1);
 136 }
 137
 138 static int __must_check smsc95xx_write_reg_nopm(struct usbnet *dev, u32 index,
 139                                                 u32 data)
 140 {
 141         return __smsc95xx_write_reg(dev, index, data, 1);
 142 }
 143
 144 static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
 145                                           u32 *data)
 146 {
 147         return __smsc95xx_read_reg(dev, index, data, 0);
 148 }
 149
 150 static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
 151                                            u32 data)
 152 {
 153         return __smsc95xx_write_reg(dev, index, data, 0);
 154 }
 155
 156 /* Loop until the read is completed with timeout
 157  * called with phy_mutex held */
 158 static int __must_check __smsc95xx_phy_wait_not_busy(struct usbnet *dev,
 159                                                      int in_pm)
 160 {
 161         unsigned long start_time = jiffies;
 162         u32 val;
 163         int ret;
 164
 165         do {
 166                 ret = __smsc95xx_read_reg(dev, MII_ADDR, &val, in_pm);
 167                 if (ret < 0) {
 168                         /* Ignore -ENODEV error during disconnect() */
 169                         if (ret == -ENODEV)
 170                                 return 0;
 171                         netdev_warn(dev->net, "Error reading MII_ACCESS\n");
 172                         return ret;
 173                 }
 174
 175                 if (!(val & MII_BUSY_))
 176                         return 0;
 177         } while (!time_after(jiffies, start_time + HZ));
 178
 179         return -EIO;
 180 }
 181
 182 static u32 mii_address_cmd(int phy_id, int idx, u16 op)
 183 {
 184         return (phy_id & 0x1f) << 11 | (idx & 0x1f) << 6 | op;
 185 }
 186
 187 static int __smsc95xx_mdio_read(struct usbnet *dev, int phy_id, int idx,
 188                                 int in_pm)
 189 {
 190         u32 val, addr;
 191         int ret;
 192
 193         mutex_lock(&dev->phy_mutex);
 194
 195         /* confirm MII not busy */
 196         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 197         if (ret < 0) {
 198                 netdev_warn(dev->net, "%s: MII is busy\n", __func__);
 199                 goto done;
 200         }
 201
 202         /* set the address, index & direction (read from PHY) */
 203         addr = mii_address_cmd(phy_id, idx, MII_READ_ | MII_BUSY_);
 204         ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
 205         if (ret < 0) {
 206                 if (ret != -ENODEV)
 207                         netdev_warn(dev->net, "Error writing MII_ADDR\n");
 208                 goto done;
 209         }
 210
 211         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 212         if (ret < 0) {
 213                 netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
 214                 goto done;
 215         }
 216
 217         ret = __smsc95xx_read_reg(dev, MII_DATA, &val, in_pm);
 218         if (ret < 0) {
 219                 if (ret != -ENODEV)
 220                         netdev_warn(dev->net, "Error reading MII_DATA\n");
 221                 goto done;
 222         }
 223
 224         ret = (u16)(val & 0xFFFF);
 225
 226 done:
 227         mutex_unlock(&dev->phy_mutex);
 228
 229         /* Ignore -ENODEV error during disconnect() */
 230         if (ret == -ENODEV)
 231                 return 0;
 232         return ret;
 233 }
 234
 235 static void __smsc95xx_mdio_write(struct usbnet *dev, int phy_id,
 236                                   int idx, int regval, int in_pm)
 237 {
 238         u32 val, addr;
 239         int ret;
 240
 241         mutex_lock(&dev->phy_mutex);
 242
 243         /* confirm MII not busy */
 244         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 245         if (ret < 0) {
 246                 netdev_warn(dev->net, "%s: MII is busy\n", __func__);
 247                 goto done;
 248         }
 249
 250         val = regval;
 251         ret = __smsc95xx_write_reg(dev, MII_DATA, val, in_pm);
 252         if (ret < 0) {
 253                 if (ret != -ENODEV)
 254                         netdev_warn(dev->net, "Error writing MII_DATA\n");
 255                 goto done;
 256         }
 257
 258         /* set the address, index & direction (write to PHY) */
 259         addr = mii_address_cmd(phy_id, idx, MII_WRITE_ | MII_BUSY_);
 260         ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
 261         if (ret < 0) {
 262                 if (ret != -ENODEV)
 263                         netdev_warn(dev->net, "Error writing MII_ADDR\n");
 264                 goto done;
 265         }
 266
 267         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 268         if (ret < 0) {
 269                 netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
 270                 goto done;
 271         }
 272
 273 done:
 274         mutex_unlock(&dev->phy_mutex);
 275 }
 276
 277 static int smsc95xx_mdio_read_nopm(struct usbnet *dev, int idx)
 278 {
 279         struct smsc95xx_priv *pdata = dev->driver_priv;
 280
 281         return __smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, idx, 1);
 282 }
 283
 284 static void smsc95xx_mdio_write_nopm(struct usbnet *dev, int idx, int regval)
 285 {
 286         struct smsc95xx_priv *pdata = dev->driver_priv;
 287
 288         __smsc95xx_mdio_write(dev, pdata->phydev->mdio.addr, idx, regval, 1);
 289 }
 290
 291 static int smsc95xx_mdiobus_read(struct mii_bus *bus, int phy_id, int idx)
 292 {
 293         struct usbnet *dev = bus->priv;
 294
 295         return __smsc95xx_mdio_read(dev, phy_id, idx, 0);
 296 }
 297
 298 static int smsc95xx_mdiobus_write(struct mii_bus *bus, int phy_id, int idx,
 299                                   u16 regval)
 300 {
 301         struct usbnet *dev = bus->priv;
 302
 303         __smsc95xx_mdio_write(dev, phy_id, idx, regval, 0);
 304         return 0;
 305 }
 306
 307 static int __must_check smsc95xx_wait_eeprom(struct usbnet *dev)
 308 {
 309         unsigned long start_time = jiffies;
 310         u32 val;
 311         int ret;
 312
 313         do {
 314                 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
 315                 if (ret < 0) {
 316                         netdev_warn(dev->net, "Error reading E2P_CMD\n");
 317                         return ret;
 318                 }
 319
 320                 if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
 321                         break;
 322                 udelay(40);
 323         } while (!time_after(jiffies, start_time + HZ));
 324
 325         if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
 326                 netdev_warn(dev->net, "EEPROM read operation timeout\n");
 327                 return -EIO;
 328         }
 329
 330         return 0;
 331 }
 332
 333 static int __must_check smsc95xx_eeprom_confirm_not_busy(struct usbnet *dev)
 334 {
 335         unsigned long start_time = jiffies;
 336         u32 val;
 337         int ret;
 338
 339         do {
 340                 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
 341                 if (ret < 0) {
 342                         netdev_warn(dev->net, "Error reading E2P_CMD\n");
 343                         return ret;
 344                 }
 345
 346                 if (!(val & E2P_CMD_BUSY_))
 347                         return 0;
 348
 349                 udelay(40);
 350         } while (!time_after(jiffies, start_time + HZ));
 351
 352         netdev_warn(dev->net, "EEPROM is busy\n");
 353         return -EIO;
 354 }
 355
 356 static int smsc95xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
 357                                 u8 *data)
 358 {
 359         u32 val;
 360         int i, ret;
 361
 362         BUG_ON(!dev);
 363         BUG_ON(!data);
 364
 365         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 366         if (ret)
 367                 return ret;
 368
 369         for (i = 0; i < length; i++) {
 370                 val = E2P_CMD_BUSY_ | E2P_CMD_READ_ | (offset & E2P_CMD_ADDR_);
 371                 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 372                 if (ret < 0) {
 373                         netdev_warn(dev->net, "Error writing E2P_CMD\n");
 374                         return ret;
 375                 }
 376
 377                 ret = smsc95xx_wait_eeprom(dev);
 378                 if (ret < 0)
 379                         return ret;
 380
 381                 ret = smsc95xx_read_reg(dev, E2P_DATA, &val);
 382                 if (ret < 0) {
 383                         netdev_warn(dev->net, "Error reading E2P_DATA\n");
 384                         return ret;
 385                 }
 386
 387                 data[i] = val & 0xFF;
 388                 offset++;
 389         }
 390
 391         return 0;
 392 }
 393
 394 static int smsc95xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
 395                                  u8 *data)
 396 {
 397         u32 val;
 398         int i, ret;
 399
 400         BUG_ON(!dev);
 401         BUG_ON(!data);
 402
 403         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 404         if (ret)
 405                 return ret;
 406
 407         /* Issue write/erase enable command */
 408         val = E2P_CMD_BUSY_ | E2P_CMD_EWEN_;
 409         ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 410         if (ret < 0) {
 411                 netdev_warn(dev->net, "Error writing E2P_DATA\n");
 412                 return ret;
 413         }
 414
 415         ret = smsc95xx_wait_eeprom(dev);
 416         if (ret < 0)
 417                 return ret;
 418
 419         for (i = 0; i < length; i++) {
 420
 421                 /* Fill data register */
 422                 val = data[i];
 423                 ret = smsc95xx_write_reg(dev, E2P_DATA, val);
 424                 if (ret < 0) {
 425                         netdev_warn(dev->net, "Error writing E2P_DATA\n");
 426                         return ret;
 427                 }
 428
 429                 /* Send "write" command */
 430                 val = E2P_CMD_BUSY_ | E2P_CMD_WRITE_ | (offset & E2P_CMD_ADDR_);
 431                 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 432                 if (ret < 0) {
 433                         netdev_warn(dev->net, "Error writing E2P_CMD\n");
 434                         return ret;
 435                 }
 436
 437                 ret = smsc95xx_wait_eeprom(dev);
 438                 if (ret < 0)
 439                         return ret;
 440
 441                 offset++;
 442         }
 443
 444         return 0;
 445 }
 446
 447 static int __must_check smsc95xx_write_reg_async(struct usbnet *dev, u16 index,
 448                                                  u32 data)
 449 {
 450         const u16 size = 4;
 451         u32 buf;
 452         int ret;
 453
 454         buf = data;
 455         cpu_to_le32s(&buf);
 456
 457         ret = usbnet_write_cmd_async(dev, USB_VENDOR_REQUEST_WRITE_REGISTER,
 458                                      USB_DIR_OUT | USB_TYPE_VENDOR |
 459                                      USB_RECIP_DEVICE,
 460                                      0, index, &buf, size);
 461         if (ret < 0)
 462                 netdev_warn(dev->net, "Error write async cmd, sts=%d\n",
 463                             ret);
 464         return ret;
 465 }
 466
 467 /* returns hash bit number for given MAC address
 468  * example:
 469  * 01 00 5E 00 00 01 -> returns bit number 31 */
 470 static unsigned int smsc95xx_hash(char addr[ETH_ALEN])
 471 {
 472         return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
 473 }
 474
 475 static void smsc95xx_set_multicast(struct net_device *netdev)
 476 {
 477         struct usbnet *dev = netdev_priv(netdev);
 478         struct smsc95xx_priv *pdata = dev->driver_priv;
 479         unsigned long flags;
 480         int ret;
 481
 482         pdata->hash_hi = 0;
 483         pdata->hash_lo = 0;
 484
 485         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 486
 487         if (dev->net->flags & IFF_PROMISC) {
 488                 netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
 489                 pdata->mac_cr |= MAC_CR_PRMS_;
 490                 pdata->mac_cr &= ~(MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 491         } else if (dev->net->flags & IFF_ALLMULTI) {
 492                 netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
 493                 pdata->mac_cr |= MAC_CR_MCPAS_;
 494                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_HPFILT_);
 495         } else if (!netdev_mc_empty(dev->net)) {
 496                 struct netdev_hw_addr *ha;
 497
 498                 pdata->mac_cr |= MAC_CR_HPFILT_;
 499                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);
 500
 501                 netdev_for_each_mc_addr(ha, netdev) {
 502                         u32 bitnum = smsc95xx_hash(ha->addr);
 503                         u32 mask = 0x01 << (bitnum & 0x1F);
 504                         if (bitnum & 0x20)
 505                                 pdata->hash_hi |= mask;
 506                         else
 507                                 pdata->hash_lo |= mask;
 508                 }
 509
 510                 netif_dbg(dev, drv, dev->net, "HASHH=0x%08X, HASHL=0x%08X\n",
 511                                    pdata->hash_hi, pdata->hash_lo);
 512         } else {
 513                 netif_dbg(dev, drv, dev->net, "receive own packets only\n");
 514                 pdata->mac_cr &=
 515                         ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 516         }
 517
 518         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 519
 520         /* Initiate async writes, as we can't wait for completion here */
 521         ret = smsc95xx_write_reg_async(dev, HASHH, pdata->hash_hi);
 522         if (ret < 0)
 523                 netdev_warn(dev->net, "failed to initiate async write to HASHH\n");
 524
 525         ret = smsc95xx_write_reg_async(dev, HASHL, pdata->hash_lo);
 526         if (ret < 0)
 527                 netdev_warn(dev->net, "failed to initiate async write to HASHL\n");
 528
 529         ret = smsc95xx_write_reg_async(dev, MAC_CR, pdata->mac_cr);
 530         if (ret < 0)
 531                 netdev_warn(dev->net, "failed to initiate async write to MAC_CR\n");
 532 }
 533
 534 static int smsc95xx_phy_update_flowcontrol(struct usbnet *dev)
 535 {
 536         u32 flow = 0, afc_cfg;
 537         struct smsc95xx_priv *pdata = dev->driver_priv;
 538         bool tx_pause, rx_pause;
 539
 540         int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
 541         if (ret < 0)
 542                 return ret;
 543
 544         if (pdata->phydev->duplex == DUPLEX_FULL) {
 545                 phy_get_pause(pdata->phydev, &tx_pause, &rx_pause);
 546
 547                 if (rx_pause)
 548                         flow = 0xFFFF0002;
 549
 550                 if (tx_pause) {
 551                         afc_cfg |= 0xF;
 552                         flow |= 0xFFFF0000;
 553                 } else {
 554                         afc_cfg &= ~0xF;
 555                 }
 556
 557                 netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
 558                           rx_pause ? "enabled" : "disabled",
 559                           tx_pause ? "enabled" : "disabled");
 560         } else {
 561                 netif_dbg(dev, link, dev->net, "half duplex\n");
 562                 afc_cfg |= 0xF;
 563         }
 564
 565         ret = smsc95xx_write_reg(dev, FLOW, flow);
 566         if (ret < 0)
 567                 return ret;
 568
 569         return smsc95xx_write_reg(dev, AFC_CFG, afc_cfg);
 570 }
 571
 572 static void smsc95xx_mac_update_fullduplex(struct usbnet *dev)
 573 {
 574         struct smsc95xx_priv *pdata = dev->driver_priv;
 575         unsigned long flags;
 576         int ret;
 577
 578         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 579         if (pdata->phydev->duplex != DUPLEX_FULL) {
 580                 pdata->mac_cr &= ~MAC_CR_FDPX_;
 581                 pdata->mac_cr |= MAC_CR_RCVOWN_;
 582         } else {
 583                 pdata->mac_cr &= ~MAC_CR_RCVOWN_;
 584                 pdata->mac_cr |= MAC_CR_FDPX_;
 585         }
 586         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 587
 588         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 589         if (ret < 0) {
 590                 if (ret != -ENODEV)
 591                         netdev_warn(dev->net,
 592                                     "Error updating MAC full duplex mode\n");
 593                 return;
 594         }
 595
 596         ret = smsc95xx_phy_update_flowcontrol(dev);
 597         if (ret < 0)
 598                 netdev_warn(dev->net, "Error updating PHY flow control\n");
 599 }
 600
 601 static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
 602 {
 603         u32 intdata;
 604
 605         if (urb->actual_length != 4) {
 606                 netdev_warn(dev->net, "unexpected urb length %d\n",
 607                             urb->actual_length);
 608                 return;
 609         }
 610
 611         intdata = get_unaligned_le32(urb->transfer_buffer);
 612         netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
 613
 614         if (intdata & INT_ENP_PHY_INT_)
 615                 ;
 616         else
 617                 netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
 618                             intdata);
 619 }
 620
 621 /* Enable or disable Tx & Rx checksum offload engines */
 622 static int smsc95xx_set_features(struct net_device *netdev,
 623         netdev_features_t features)
 624 {
 625         struct usbnet *dev = netdev_priv(netdev);
 626         u32 read_buf;
 627         int ret;
 628
 629         ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
 630         if (ret < 0)
 631                 return ret;
 632
 633         if (features & NETIF_F_IP_CSUM)
 634                 read_buf |= Tx_COE_EN_;
 635         else
 636                 read_buf &= ~Tx_COE_EN_;
 637
 638         if (features & NETIF_F_RXCSUM)
 639                 read_buf |= Rx_COE_EN_;
 640         else
 641                 read_buf &= ~Rx_COE_EN_;
 642
 643         ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
 644         if (ret < 0)
 645                 return ret;
 646
 647         netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
 648         return 0;
 649 }
 650
 651 static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
 652 {
 653         return MAX_EEPROM_SIZE;
 654 }
 655
 656 static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
 657                                        struct ethtool_eeprom *ee, u8 *data)
 658 {
 659         struct usbnet *dev = netdev_priv(netdev);
 660
 661         ee->magic = LAN95XX_EEPROM_MAGIC;
 662
 663         return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
 664 }
 665
 666 static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
 667                                        struct ethtool_eeprom *ee, u8 *data)
 668 {
 669         struct usbnet *dev = netdev_priv(netdev);
 670
 671         if (ee->magic != LAN95XX_EEPROM_MAGIC) {
 672                 netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
 673                             ee->magic);
 674                 return -EINVAL;
 675         }
 676
 677         return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
 678 }
 679
 680 static int smsc95xx_ethtool_getregslen(struct net_device *netdev)
 681 {
 682         /* all smsc95xx registers */
 683         return COE_CR - ID_REV + sizeof(u32);
 684 }
 685
 686 static void
 687 smsc95xx_ethtool_getregs(struct net_device *netdev, struct ethtool_regs *regs,
 688                          void *buf)
 689 {
 690         struct usbnet *dev = netdev_priv(netdev);
 691         unsigned int i, j;
 692         int retval;
 693         u32 *data = buf;
 694
 695         retval = smsc95xx_read_reg(dev, ID_REV, &regs->version);
 696         if (retval < 0) {
 697                 netdev_warn(netdev, "REGS: cannot read ID_REV\n");
 698                 return;
 699         }
 700
 701         for (i = ID_REV, j = 0; i <= COE_CR; i += (sizeof(u32)), j++) {
 702                 retval = smsc95xx_read_reg(dev, i, &data[j]);
 703                 if (retval < 0) {
 704                         netdev_warn(netdev, "REGS: cannot read reg[%x]\n", i);
 705                         return;
 706                 }
 707         }
 708 }
 709
 710 static void smsc95xx_ethtool_get_wol(struct net_device *net,
 711                                      struct ethtool_wolinfo *wolinfo)
 712 {
 713         struct usbnet *dev = netdev_priv(net);
 714         struct smsc95xx_priv *pdata = dev->driver_priv;
 715
 716         wolinfo->supported = SUPPORTED_WAKE;
 717         wolinfo->wolopts = pdata->wolopts;
 718 }
 719
 720 static int smsc95xx_ethtool_set_wol(struct net_device *net,
 721                                     struct ethtool_wolinfo *wolinfo)
 722 {
 723         struct usbnet *dev = netdev_priv(net);
 724         struct smsc95xx_priv *pdata = dev->driver_priv;
 725         int ret;
 726
 727         if (wolinfo->wolopts & ~SUPPORTED_WAKE)
 728                 return -EINVAL;
 729
 730         pdata->wolopts = wolinfo->wolopts & SUPPORTED_WAKE;
 731
 732         ret = device_set_wakeup_enable(&dev->udev->dev, pdata->wolopts);
 733         if (ret < 0)
 734                 netdev_warn(dev->net, "device_set_wakeup_enable error %d\n", ret);
 735
 736         return ret;
 737 }
 738
 739 static u32 smsc95xx_get_link(struct net_device *net)
 740 {
 741         phy_read_status(net->phydev);
 742         return net->phydev->link;
 743 }
 744
 745 static const struct ethtool_ops smsc95xx_ethtool_ops = {
 746         .get_link       = smsc95xx_get_link,
 747         .nway_reset     = phy_ethtool_nway_reset,
 748         .get_drvinfo    = usbnet_get_drvinfo,
 749         .get_msglevel   = usbnet_get_msglevel,
 750         .set_msglevel   = usbnet_set_msglevel,
 751         .get_eeprom_len = smsc95xx_ethtool_get_eeprom_len,
 752         .get_eeprom     = smsc95xx_ethtool_get_eeprom,
 753         .set_eeprom     = smsc95xx_ethtool_set_eeprom,
 754         .get_regs_len   = smsc95xx_ethtool_getregslen,
 755         .get_regs       = smsc95xx_ethtool_getregs,
 756         .get_wol        = smsc95xx_ethtool_get_wol,
 757         .set_wol        = smsc95xx_ethtool_set_wol,
 758         .get_link_ksettings     = phy_ethtool_get_link_ksettings,
 759         .set_link_ksettings     = phy_ethtool_set_link_ksettings,
 760         .get_ts_info    = ethtool_op_get_ts_info,
 761 };
 762
 763 static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
 764 {
 765         if (!netif_running(netdev))
 766                 return -EINVAL;
 767
 768         return phy_mii_ioctl(netdev->phydev, rq, cmd);
 769 }
 770
 771 static void smsc95xx_init_mac_address(struct usbnet *dev)
 772 {
 773         /* maybe the boot loader passed the MAC address in devicetree */
 774         if (!eth_platform_get_mac_address(&dev->udev->dev,
 775                         dev->net->dev_addr)) {
 776                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 777                         /* device tree values are valid so use them */
 778                         netif_dbg(dev, ifup, dev->net, "MAC address read from the device tree\n");
 779                         return;
 780                 }
 781         }
 782
 783         /* try reading mac address from EEPROM */
 784         if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
 785                         dev->net->dev_addr) == 0) {
 786                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 787                         /* eeprom values are valid so use them */
 788                         netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
 789                         return;
 790                 }
 791         }
 792
 793         /* no useful static MAC address found. generate a random one */
 794         eth_hw_addr_random(dev->net);
 795         netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
 796 }
 797
 798 static int smsc95xx_set_mac_address(struct usbnet *dev)
 799 {
 800         u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
 801                 dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
 802         u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
 803         int ret;
 804
 805         ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
 806         if (ret < 0)
 807                 return ret;
 808
 809         return smsc95xx_write_reg(dev, ADDRH, addr_hi);
 810 }
 811
 812 /* starts the TX path */
 813 static int smsc95xx_start_tx_path(struct usbnet *dev)
 814 {
 815         struct smsc95xx_priv *pdata = dev->driver_priv;
 816         unsigned long flags;
 817         int ret;
 818
 819         /* Enable Tx at MAC */
 820         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 821         pdata->mac_cr |= MAC_CR_TXEN_;
 822         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 823
 824         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 825         if (ret < 0)
 826                 return ret;
 827
 828         /* Enable Tx at SCSRs */
 829         return smsc95xx_write_reg(dev, TX_CFG, TX_CFG_ON_);
 830 }
 831
 832 /* Starts the Receive path */
 833 static int smsc95xx_start_rx_path(struct usbnet *dev, int in_pm)
 834 {
 835         struct smsc95xx_priv *pdata = dev->driver_priv;
 836         unsigned long flags;
 837
 838         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 839         pdata->mac_cr |= MAC_CR_RXEN_;
 840         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 841
 842         return __smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr, in_pm);
 843 }
 844
 845 static int smsc95xx_reset(struct usbnet *dev)
 846 {
 847         struct smsc95xx_priv *pdata = dev->driver_priv;
 848         u32 read_buf, write_buf, burst_cap;
 849         int ret = 0, timeout;
 850
 851         netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
 852
 853         ret = smsc95xx_write_reg(dev, HW_CFG, HW_CFG_LRST_);
 854         if (ret < 0)
 855                 return ret;
 856
 857         timeout = 0;
 858         do {
 859                 msleep(10);
 860                 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 861                 if (ret < 0)
 862                         return ret;
 863                 timeout++;
 864         } while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
 865
 866         if (timeout >= 100) {
 867                 netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
 868                 return -ETIMEDOUT;
 869         }
 870
 871         ret = smsc95xx_write_reg(dev, PM_CTRL, PM_CTL_PHY_RST_);
 872         if (ret < 0)
 873                 return ret;
 874
 875         timeout = 0;
 876         do {
 877                 msleep(10);
 878                 ret = smsc95xx_read_reg(dev, PM_CTRL, &read_buf);
 879                 if (ret < 0)
 880                         return ret;
 881                 timeout++;
 882         } while ((read_buf & PM_CTL_PHY_RST_) && (timeout < 100));
 883
 884         if (timeout >= 100) {
 885                 netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
 886                 return ret;
 887         }
 888
 889         ret = smsc95xx_set_mac_address(dev);
 890         if (ret < 0)
 891                 return ret;
 892
 893         netif_dbg(dev, ifup, dev->net, "MAC Address: %pM\n",
 894                   dev->net->dev_addr);
 895
 896         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 897         if (ret < 0)
 898                 return ret;
 899
 900         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x\n",
 901                   read_buf);
 902
 903         read_buf |= HW_CFG_BIR_;
 904
 905         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 906         if (ret < 0)
 907                 return ret;
 908
 909         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 910         if (ret < 0)
 911                 return ret;
 912
 913         netif_dbg(dev, ifup, dev->net,
 914                   "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
 915                   read_buf);
 916
 917         if (!turbo_mode) {
 918                 burst_cap = 0;
 919                 dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
 920         } else if (dev->udev->speed == USB_SPEED_HIGH) {
 921                 burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
 922                 dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
 923         } else {
 924                 burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
 925                 dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
 926         }
 927
 928         netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld\n",
 929                   (ulong)dev->rx_urb_size);
 930
 931         ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
 932         if (ret < 0)
 933                 return ret;
 934
 935         ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
 936         if (ret < 0)
 937                 return ret;
 938
 939         netif_dbg(dev, ifup, dev->net,
 940                   "Read Value from BURST_CAP after writing: 0x%08x\n",
 941                   read_buf);
 942
 943         ret = smsc95xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
 944         if (ret < 0)
 945                 return ret;
 946
 947         ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
 948         if (ret < 0)
 949                 return ret;
 950
 951         netif_dbg(dev, ifup, dev->net,
 952                   "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
 953                   read_buf);
 954
 955         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 956         if (ret < 0)
 957                 return ret;
 958
 959         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG: 0x%08x\n",
 960                   read_buf);
 961
 962         if (turbo_mode)
 963                 read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
 964
 965         read_buf &= ~HW_CFG_RXDOFF_;
 966
 967         /* set Rx data offset=2, Make IP header aligns on word boundary. */
 968         read_buf |= NET_IP_ALIGN << 9;
 969
 970         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 971         if (ret < 0)
 972                 return ret;
 973
 974         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 975         if (ret < 0)
 976                 return ret;
 977
 978         netif_dbg(dev, ifup, dev->net,
 979                   "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
 980
 981         ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
 982         if (ret < 0)
 983                 return ret;
 984
 985         ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
 986         if (ret < 0)
 987                 return ret;
 988         netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
 989
 990         /* Configure GPIO pins as LED outputs */
 991         write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
 992                 LED_GPIO_CFG_FDX_LED;
 993         ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
 994         if (ret < 0)
 995                 return ret;
 996
 997         /* Init Tx */
 998         ret = smsc95xx_write_reg(dev, FLOW, 0);
 999         if (ret < 0)
1000                 return ret;
1001
1002         ret = smsc95xx_write_reg(dev, AFC_CFG, AFC_CFG_DEFAULT);
1003         if (ret < 0)
1004                 return ret;
1005
1006         /* Don't need mac_cr_lock during initialisation */
1007         ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
1008         if (ret < 0)
1009                 return ret;
1010
1011         /* Init Rx */
1012         /* Set Vlan */
1013         ret = smsc95xx_write_reg(dev, VLAN1, (u32)ETH_P_8021Q);
1014         if (ret < 0)
1015                 return ret;
1016
1017         /* Enable or disable checksum offload engines */
1018         ret = smsc95xx_set_features(dev->net, dev->net->features);
1019         if (ret < 0) {
1020                 netdev_warn(dev->net, "Failed to set checksum offload features\n");
1021                 return ret;
1022         }
1023
1024         smsc95xx_set_multicast(dev->net);
1025
1026         ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
1027         if (ret < 0)
1028                 return ret;
1029
1030         /* enable PHY interrupts */
1031         read_buf |= INT_EP_CTL_PHY_INT_;
1032
1033         ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
1034         if (ret < 0)
1035                 return ret;
1036
1037         ret = smsc95xx_start_tx_path(dev);
1038         if (ret < 0) {
1039                 netdev_warn(dev->net, "Failed to start TX path\n");
1040                 return ret;
1041         }
1042
1043         ret = smsc95xx_start_rx_path(dev, 0);
1044         if (ret < 0) {
1045                 netdev_warn(dev->net, "Failed to start RX path\n");
1046                 return ret;
1047         }
1048
1049         netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1050         return 0;
1051 }
1052
1053 static const struct net_device_ops smsc95xx_netdev_ops = {
1054         .ndo_open               = usbnet_open,
1055         .ndo_stop               = usbnet_stop,
1056         .ndo_start_xmit         = usbnet_start_xmit,
1057         .ndo_tx_timeout         = usbnet_tx_timeout,
1058         .ndo_change_mtu         = usbnet_change_mtu,
1059         .ndo_get_stats64        = usbnet_get_stats64,
1060         .ndo_set_mac_address    = eth_mac_addr,
1061         .ndo_validate_addr      = eth_validate_addr,
1062         .ndo_do_ioctl           = smsc95xx_ioctl,
1063         .ndo_set_rx_mode        = smsc95xx_set_multicast,
1064         .ndo_set_features       = smsc95xx_set_features,
1065 };
1066
1067 static void smsc95xx_handle_link_change(struct net_device *net)
1068 {
1069         struct usbnet *dev = netdev_priv(net);
1070
1071         phy_print_status(net->phydev);
1072         smsc95xx_mac_update_fullduplex(dev);
1073         usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1074 }
1075
1076 static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1077 {
1078         struct smsc95xx_priv *pdata;
1079         bool is_internal_phy;
1080         u32 val;
1081         int ret;
1082
1083         printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1084
1085         ret = usbnet_get_endpoints(dev, intf);
1086         if (ret < 0) {
1087                 netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1088                 return ret;
1089         }
1090
1091         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
1092         if (!pdata)
1093                 return -ENOMEM;
1094
1095         dev->driver_priv = pdata;
1096
1097         spin_lock_init(&pdata->mac_cr_lock);
1098
1099         /* LAN95xx devices do not alter the computed checksum of 0 to 0xffff.
1100          * RFC 2460, ipv6 UDP calculated checksum yields a result of zero must
1101          * be changed to 0xffff. RFC 768, ipv4 UDP computed checksum is zero,
1102          * it is transmitted as all ones. The zero transmitted checksum means
1103          * transmitter generated no checksum. Hence, enable csum offload only
1104          * for ipv4 packets.
1105          */
1106         if (DEFAULT_TX_CSUM_ENABLE)
1107                 dev->net->features |= NETIF_F_IP_CSUM;
1108         if (DEFAULT_RX_CSUM_ENABLE)
1109                 dev->net->features |= NETIF_F_RXCSUM;
1110
1111         dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1112         set_bit(EVENT_NO_IP_ALIGN, &dev->flags);
1113
1114         smsc95xx_init_mac_address(dev);
1115
1116         /* Init all registers */
1117         ret = smsc95xx_reset(dev);
1118         if (ret)
1119                 goto free_pdata;
1120
1121         pdata->mdiobus = mdiobus_alloc();
1122         if (!pdata->mdiobus) {
1123                 ret = -ENOMEM;
1124                 goto free_pdata;
1125         }
1126
1127         ret = smsc95xx_read_reg(dev, HW_CFG, &val);
1128         if (ret < 0)
1129                 goto free_mdio;
1130
1131         is_internal_phy = !(val & HW_CFG_PSEL_);
1132         if (is_internal_phy)
1133                 pdata->mdiobus->phy_mask = ~(1u << SMSC95XX_INTERNAL_PHY_ID);
1134
1135         pdata->mdiobus->priv = dev;
1136         pdata->mdiobus->read = smsc95xx_mdiobus_read;
1137         pdata->mdiobus->write = smsc95xx_mdiobus_write;
1138         pdata->mdiobus->name = "smsc95xx-mdiobus";
1139         pdata->mdiobus->parent = &dev->udev->dev;
1140
1141         snprintf(pdata->mdiobus->id, ARRAY_SIZE(pdata->mdiobus->id),
1142                  "usb-%03d:%03d", dev->udev->bus->busnum, dev->udev->devnum);
1143
1144         ret = mdiobus_register(pdata->mdiobus);
1145         if (ret) {
1146                 netdev_err(dev->net, "Could not register MDIO bus\n");
1147                 goto free_mdio;
1148         }
1149
1150         pdata->phydev = phy_find_first(pdata->mdiobus);
1151         if (!pdata->phydev) {
1152                 netdev_err(dev->net, "no PHY found\n");
1153                 ret = -ENODEV;
1154                 goto unregister_mdio;
1155         }
1156
1157         pdata->phydev->is_internal = is_internal_phy;
1158
1159         /* detect device revision as different features may be available */
1160         ret = smsc95xx_read_reg(dev, ID_REV, &val);
1161         if (ret < 0)
1162                 goto unregister_mdio;
1163
1164         val >>= 16;
1165         if ((val == ID_REV_CHIP_ID_9500A_) || (val == ID_REV_CHIP_ID_9530_) ||
1166             (val == ID_REV_CHIP_ID_89530_) || (val == ID_REV_CHIP_ID_9730_))
1167                 pdata->features = (FEATURE_8_WAKEUP_FILTERS |
1168                         FEATURE_PHY_NLP_CROSSOVER |
1169                         FEATURE_REMOTE_WAKEUP);
1170         else if (val == ID_REV_CHIP_ID_9512_)
1171                 pdata->features = FEATURE_8_WAKEUP_FILTERS;
1172
1173         dev->net->netdev_ops = &smsc95xx_netdev_ops;
1174         dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1175         dev->net->flags |= IFF_MULTICAST;
1176         dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
1177         dev->net->min_mtu = ETH_MIN_MTU;
1178         dev->net->max_mtu = ETH_DATA_LEN;
1179         dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
1180
1181         ret = phy_connect_direct(dev->net, pdata->phydev,
1182                                  &smsc95xx_handle_link_change,
1183                                  PHY_INTERFACE_MODE_MII);
1184         if (ret) {
1185                 netdev_err(dev->net, "can't attach PHY to %s\n", pdata->mdiobus->id);
1186                 goto unregister_mdio;
1187         }
1188
1189         phy_attached_info(dev->net->phydev);
1190
1191         return 0;
1192
1193 unregister_mdio:
1194         mdiobus_unregister(pdata->mdiobus);
1195
1196 free_mdio:
1197         mdiobus_free(pdata->mdiobus);
1198
1199 free_pdata:
1200         kfree(pdata);
1201         return ret;
1202 }
1203
1204 static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1205 {
1206         struct smsc95xx_priv *pdata = dev->driver_priv;
1207
1208         phy_disconnect(dev->net->phydev);
1209         mdiobus_unregister(pdata->mdiobus);
1210         mdiobus_free(pdata->mdiobus);
1211         netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1212         kfree(pdata);
1213 }
1214
1215 static int smsc95xx_start_phy(struct usbnet *dev)
1216 {
1217         phy_start(dev->net->phydev);
1218
1219         return 0;
1220 }
1221
1222 static int smsc95xx_stop(struct usbnet *dev)
1223 {
1224         if (dev->net->phydev)
1225                 phy_stop(dev->net->phydev);
1226
1227         return 0;
1228 }
1229
1230 static u32 smsc_crc(const u8 *buffer, size_t len, int filter)
1231 {
1232         u32 crc = bitrev16(crc16(0xFFFF, buffer, len));
1233         return crc << ((filter % 2) * 16);
1234 }
1235
1236 static int smsc95xx_enable_phy_wakeup_interrupts(struct usbnet *dev, u16 mask)
1237 {
1238         int ret;
1239
1240         netdev_dbg(dev->net, "enabling PHY wakeup interrupts\n");
1241
1242         /* read to clear */
1243         ret = smsc95xx_mdio_read_nopm(dev, PHY_INT_SRC);
1244         if (ret < 0)
1245                 return ret;
1246
1247         /* enable interrupt source */
1248         ret = smsc95xx_mdio_read_nopm(dev, PHY_INT_MASK);
1249         if (ret < 0)
1250                 return ret;
1251
1252         ret |= mask;
1253
1254         smsc95xx_mdio_write_nopm(dev, PHY_INT_MASK, ret);
1255
1256         return 0;
1257 }
1258
1259 static int smsc95xx_link_ok_nopm(struct usbnet *dev)
1260 {
1261         int ret;
1262
1263         /* first, a dummy read, needed to latch some MII phys */
1264         ret = smsc95xx_mdio_read_nopm(dev, MII_BMSR);
1265         if (ret < 0)
1266                 return ret;
1267
1268         ret = smsc95xx_mdio_read_nopm(dev, MII_BMSR);
1269         if (ret < 0)
1270                 return ret;
1271
1272         return !!(ret & BMSR_LSTATUS);
1273 }
1274
1275 static int smsc95xx_enter_suspend0(struct usbnet *dev)
1276 {
1277         struct smsc95xx_priv *pdata = dev->driver_priv;
1278         u32 val;
1279         int ret;
1280
1281         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1282         if (ret < 0)
1283                 return ret;
1284
1285         val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
1286         val |= PM_CTL_SUS_MODE_0;
1287
1288         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1289         if (ret < 0)
1290                 return ret;
1291
1292         /* clear wol status */
1293         val &= ~PM_CTL_WUPS_;
1294         val |= PM_CTL_WUPS_WOL_;
1295
1296         /* enable energy detection */
1297         if (pdata->wolopts & WAKE_PHY)
1298                 val |= PM_CTL_WUPS_ED_;
1299
1300         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1301         if (ret < 0)
1302                 return ret;
1303
1304         /* read back PM_CTRL */
1305         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1306         if (ret < 0)
1307                 return ret;
1308
1309         pdata->suspend_flags |= SUSPEND_SUSPEND0;
1310
1311         return 0;
1312 }
1313
1314 static int smsc95xx_enter_suspend1(struct usbnet *dev)
1315 {
1316         struct smsc95xx_priv *pdata = dev->driver_priv;
1317         u32 val;
1318         int ret;
1319
1320         /* reconfigure link pulse detection timing for
1321          * compatibility with non-standard link partners
1322          */
1323         if (pdata->features & FEATURE_PHY_NLP_CROSSOVER)
1324                 smsc95xx_mdio_write_nopm(dev, PHY_EDPD_CONFIG,
1325                                          PHY_EDPD_CONFIG_DEFAULT);
1326
1327         /* enable energy detect power-down mode */
1328         ret = smsc95xx_mdio_read_nopm(dev, PHY_MODE_CTRL_STS);
1329         if (ret < 0)
1330                 return ret;
1331
1332         ret |= MODE_CTRL_STS_EDPWRDOWN_;
1333
1334         smsc95xx_mdio_write_nopm(dev, PHY_MODE_CTRL_STS, ret);
1335
1336         /* enter SUSPEND1 mode */
1337         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1338         if (ret < 0)
1339                 return ret;
1340
1341         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1342         val |= PM_CTL_SUS_MODE_1;
1343
1344         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1345         if (ret < 0)
1346                 return ret;
1347
1348         /* clear wol status, enable energy detection */
1349         val &= ~PM_CTL_WUPS_;
1350         val |= (PM_CTL_WUPS_ED_ | PM_CTL_ED_EN_);
1351
1352         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1353         if (ret < 0)
1354                 return ret;
1355
1356         pdata->suspend_flags |= SUSPEND_SUSPEND1;
1357
1358         return 0;
1359 }
1360
1361 static int smsc95xx_enter_suspend2(struct usbnet *dev)
1362 {
1363         struct smsc95xx_priv *pdata = dev->driver_priv;
1364         u32 val;
1365         int ret;
1366
1367         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1368         if (ret < 0)
1369                 return ret;
1370
1371         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1372         val |= PM_CTL_SUS_MODE_2;
1373
1374         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1375         if (ret < 0)
1376                 return ret;
1377
1378         pdata->suspend_flags |= SUSPEND_SUSPEND2;
1379
1380         return 0;
1381 }
1382
1383 static int smsc95xx_enter_suspend3(struct usbnet *dev)
1384 {
1385         struct smsc95xx_priv *pdata = dev->driver_priv;
1386         u32 val;
1387         int ret;
1388
1389         ret = smsc95xx_read_reg_nopm(dev, RX_FIFO_INF, &val);
1390         if (ret < 0)
1391                 return ret;
1392
1393         if (val & RX_FIFO_INF_USED_) {
1394                 netdev_info(dev->net, "rx fifo not empty in autosuspend\n");
1395                 return -EBUSY;
1396         }
1397
1398         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1399         if (ret < 0)
1400                 return ret;
1401
1402         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1403         val |= PM_CTL_SUS_MODE_3 | PM_CTL_RES_CLR_WKP_STS;
1404
1405         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1406         if (ret < 0)
1407                 return ret;
1408
1409         /* clear wol status */
1410         val &= ~PM_CTL_WUPS_;
1411         val |= PM_CTL_WUPS_WOL_;
1412
1413         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1414         if (ret < 0)
1415                 return ret;
1416
1417         pdata->suspend_flags |= SUSPEND_SUSPEND3;
1418
1419         return 0;
1420 }
1421
1422 static int smsc95xx_autosuspend(struct usbnet *dev, u32 link_up)
1423 {
1424         struct smsc95xx_priv *pdata = dev->driver_priv;
1425         int ret;
1426
1427         if (!netif_running(dev->net)) {
1428                 /* interface is ifconfig down so fully power down hw */
1429                 netdev_dbg(dev->net, "autosuspend entering SUSPEND2\n");
1430                 return smsc95xx_enter_suspend2(dev);
1431         }
1432
1433         if (!link_up) {
1434                 /* link is down so enter EDPD mode, but only if device can
1435                  * reliably resume from it.  This check should be redundant
1436                  * as current FEATURE_REMOTE_WAKEUP parts also support
1437                  * FEATURE_PHY_NLP_CROSSOVER but it's included for clarity */
1438                 if (!(pdata->features & FEATURE_PHY_NLP_CROSSOVER)) {
1439                         netdev_warn(dev->net, "EDPD not supported\n");
1440                         return -EBUSY;
1441                 }
1442
1443                 netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n");
1444
1445                 /* enable PHY wakeup events for if cable is attached */
1446                 ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1447                         PHY_INT_MASK_ANEG_COMP_);
1448                 if (ret < 0) {
1449                         netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1450                         return ret;
1451                 }
1452
1453                 netdev_info(dev->net, "entering SUSPEND1 mode\n");
1454                 return smsc95xx_enter_suspend1(dev);
1455         }
1456
1457         /* enable PHY wakeup events so we remote wakeup if cable is pulled */
1458         ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1459                 PHY_INT_MASK_LINK_DOWN_);
1460         if (ret < 0) {
1461                 netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1462                 return ret;
1463         }
1464
1465         netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n");
1466         return smsc95xx_enter_suspend3(dev);
1467 }
1468
1469 static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
1470 {
1471         struct usbnet *dev = usb_get_intfdata(intf);
1472         struct smsc95xx_priv *pdata = dev->driver_priv;
1473         u32 val, link_up;
1474         int ret;
1475
1476         pdata->pm_task = current;
1477
1478         ret = usbnet_suspend(intf, message);
1479         if (ret < 0) {
1480                 netdev_warn(dev->net, "usbnet_suspend error\n");
1481                 pdata->pm_task = NULL;
1482                 return ret;
1483         }
1484
1485         if (pdata->suspend_flags) {
1486                 netdev_warn(dev->net, "error during last resume\n");
1487                 pdata->suspend_flags = 0;
1488         }
1489
1490         /* determine if link is up using only _nopm functions */
1491         link_up = smsc95xx_link_ok_nopm(dev);
1492
1493         if (message.event == PM_EVENT_AUTO_SUSPEND &&
1494             (pdata->features & FEATURE_REMOTE_WAKEUP)) {
1495                 ret = smsc95xx_autosuspend(dev, link_up);
1496                 goto done;
1497         }
1498
1499         /* if we get this far we're not autosuspending */
1500         /* if no wol options set, or if link is down and we're not waking on
1501          * PHY activity, enter lowest power SUSPEND2 mode
1502          */
1503         if (!(pdata->wolopts & SUPPORTED_WAKE) ||
1504                 !(link_up || (pdata->wolopts & WAKE_PHY))) {
1505                 netdev_info(dev->net, "entering SUSPEND2 mode\n");
1506
1507                 /* disable energy detect (link up) & wake up events */
1508                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1509                 if (ret < 0)
1510                         goto done;
1511
1512                 val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
1513
1514                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1515                 if (ret < 0)
1516                         goto done;
1517
1518                 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1519                 if (ret < 0)
1520                         goto done;
1521
1522                 val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
1523
1524                 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1525                 if (ret < 0)
1526                         goto done;
1527
1528                 ret = smsc95xx_enter_suspend2(dev);
1529                 goto done;
1530         }
1531
1532         if (pdata->wolopts & WAKE_PHY) {
1533                 ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1534                         (PHY_INT_MASK_ANEG_COMP_ | PHY_INT_MASK_LINK_DOWN_));
1535                 if (ret < 0) {
1536                         netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1537                         goto done;
1538                 }
1539
1540                 /* if link is down then configure EDPD and enter SUSPEND1,
1541                  * otherwise enter SUSPEND0 below
1542                  */
1543                 if (!link_up) {
1544                         netdev_info(dev->net, "entering SUSPEND1 mode\n");
1545                         ret = smsc95xx_enter_suspend1(dev);
1546                         goto done;
1547                 }
1548         }
1549
1550         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1551                 u32 *filter_mask = kcalloc(32, sizeof(u32), GFP_KERNEL);
1552                 u32 command[2];
1553                 u32 offset[2];
1554                 u32 crc[4];
1555                 int wuff_filter_count =
1556                         (pdata->features & FEATURE_8_WAKEUP_FILTERS) ?
1557                         LAN9500A_WUFF_NUM : LAN9500_WUFF_NUM;
1558                 int i, filter = 0;
1559
1560                 if (!filter_mask) {
1561                         netdev_warn(dev->net, "Unable to allocate filter_mask\n");
1562                         ret = -ENOMEM;
1563                         goto done;
1564                 }
1565
1566                 memset(command, 0, sizeof(command));
1567                 memset(offset, 0, sizeof(offset));
1568                 memset(crc, 0, sizeof(crc));
1569
1570                 if (pdata->wolopts & WAKE_BCAST) {
1571                         const u8 bcast[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
1572                         netdev_info(dev->net, "enabling broadcast detection\n");
1573                         filter_mask[filter * 4] = 0x003F;
1574                         filter_mask[filter * 4 + 1] = 0x00;
1575                         filter_mask[filter * 4 + 2] = 0x00;
1576                         filter_mask[filter * 4 + 3] = 0x00;
1577                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1578                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1579                         crc[filter/2] |= smsc_crc(bcast, 6, filter);
1580                         filter++;
1581                 }
1582
1583                 if (pdata->wolopts & WAKE_MCAST) {
1584                         const u8 mcast[] = {0x01, 0x00, 0x5E};
1585                         netdev_info(dev->net, "enabling multicast detection\n");
1586                         filter_mask[filter * 4] = 0x0007;
1587                         filter_mask[filter * 4 + 1] = 0x00;
1588                         filter_mask[filter * 4 + 2] = 0x00;
1589                         filter_mask[filter * 4 + 3] = 0x00;
1590                         command[filter/4] |= 0x09UL << ((filter % 4) * 8);
1591                         offset[filter/4] |= 0x00  << ((filter % 4) * 8);
1592                         crc[filter/2] |= smsc_crc(mcast, 3, filter);
1593                         filter++;
1594                 }
1595
1596                 if (pdata->wolopts & WAKE_ARP) {
1597                         const u8 arp[] = {0x08, 0x06};
1598                         netdev_info(dev->net, "enabling ARP detection\n");
1599                         filter_mask[filter * 4] = 0x0003;
1600                         filter_mask[filter * 4 + 1] = 0x00;
1601                         filter_mask[filter * 4 + 2] = 0x00;
1602                         filter_mask[filter * 4 + 3] = 0x00;
1603                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1604                         offset[filter/4] |= 0x0C << ((filter % 4) * 8);
1605                         crc[filter/2] |= smsc_crc(arp, 2, filter);
1606                         filter++;
1607                 }
1608
1609                 if (pdata->wolopts & WAKE_UCAST) {
1610                         netdev_info(dev->net, "enabling unicast detection\n");
1611                         filter_mask[filter * 4] = 0x003F;
1612                         filter_mask[filter * 4 + 1] = 0x00;
1613                         filter_mask[filter * 4 + 2] = 0x00;
1614                         filter_mask[filter * 4 + 3] = 0x00;
1615                         command[filter/4] |= 0x01UL << ((filter % 4) * 8);
1616                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1617                         crc[filter/2] |= smsc_crc(dev->net->dev_addr, ETH_ALEN, filter);
1618                         filter++;
1619                 }
1620
1621                 for (i = 0; i < (wuff_filter_count * 4); i++) {
1622                         ret = smsc95xx_write_reg_nopm(dev, WUFF, filter_mask[i]);
1623                         if (ret < 0) {
1624                                 kfree(filter_mask);
1625                                 goto done;
1626                         }
1627                 }
1628                 kfree(filter_mask);
1629
1630                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1631                         ret = smsc95xx_write_reg_nopm(dev, WUFF, command[i]);
1632                         if (ret < 0)
1633                                 goto done;
1634                 }
1635
1636                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1637                         ret = smsc95xx_write_reg_nopm(dev, WUFF, offset[i]);
1638                         if (ret < 0)
1639                                 goto done;
1640                 }
1641
1642                 for (i = 0; i < (wuff_filter_count / 2); i++) {
1643                         ret = smsc95xx_write_reg_nopm(dev, WUFF, crc[i]);
1644                         if (ret < 0)
1645                                 goto done;
1646                 }
1647
1648                 /* clear any pending pattern match packet status */
1649                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1650                 if (ret < 0)
1651                         goto done;
1652
1653                 val |= WUCSR_WUFR_;
1654
1655                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1656                 if (ret < 0)
1657                         goto done;
1658         }
1659
1660         if (pdata->wolopts & WAKE_MAGIC) {
1661                 /* clear any pending magic packet status */
1662                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1663                 if (ret < 0)
1664                         goto done;
1665
1666                 val |= WUCSR_MPR_;
1667
1668                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1669                 if (ret < 0)
1670                         goto done;
1671         }
1672
1673         /* enable/disable wakeup sources */
1674         ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1675         if (ret < 0)
1676                 goto done;
1677
1678         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1679                 netdev_info(dev->net, "enabling pattern match wakeup\n");
1680                 val |= WUCSR_WAKE_EN_;
1681         } else {
1682                 netdev_info(dev->net, "disabling pattern match wakeup\n");
1683                 val &= ~WUCSR_WAKE_EN_;
1684         }
1685
1686         if (pdata->wolopts & WAKE_MAGIC) {
1687                 netdev_info(dev->net, "enabling magic packet wakeup\n");
1688                 val |= WUCSR_MPEN_;
1689         } else {
1690                 netdev_info(dev->net, "disabling magic packet wakeup\n");
1691                 val &= ~WUCSR_MPEN_;
1692         }
1693
1694         ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1695         if (ret < 0)
1696                 goto done;
1697
1698         /* enable wol wakeup source */
1699         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1700         if (ret < 0)
1701                 goto done;
1702
1703         val |= PM_CTL_WOL_EN_;
1704
1705         /* phy energy detect wakeup source */
1706         if (pdata->wolopts & WAKE_PHY)
1707                 val |= PM_CTL_ED_EN_;
1708
1709         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1710         if (ret < 0)
1711                 goto done;
1712
1713         /* enable receiver to enable frame reception */
1714         smsc95xx_start_rx_path(dev, 1);
1715
1716         /* some wol options are enabled, so enter SUSPEND0 */
1717         netdev_info(dev->net, "entering SUSPEND0 mode\n");
1718         ret = smsc95xx_enter_suspend0(dev);
1719
1720 done:
1721         /*
1722          * TODO: resume() might need to handle the suspend failure
1723          * in system sleep
1724          */
1725         if (ret && PMSG_IS_AUTO(message))
1726                 usbnet_resume(intf);
1727
1728         pdata->pm_task = NULL;
1729         return ret;
1730 }
1731
1732 static int smsc95xx_resume(struct usb_interface *intf)
1733 {
1734         struct usbnet *dev = usb_get_intfdata(intf);
1735         struct smsc95xx_priv *pdata;
1736         u8 suspend_flags;
1737         int ret;
1738         u32 val;
1739
1740         BUG_ON(!dev);
1741         pdata = dev->driver_priv;
1742         suspend_flags = pdata->suspend_flags;
1743
1744         netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags);
1745
1746         /* do this first to ensure it's cleared even in error case */
1747         pdata->suspend_flags = 0;
1748
1749         pdata->pm_task = current;
1750
1751         if (suspend_flags & SUSPEND_ALLMODES) {
1752                 /* clear wake-up sources */
1753                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1754                 if (ret < 0)
1755                         goto done;
1756
1757                 val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
1758
1759                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1760                 if (ret < 0)
1761                         goto done;
1762
1763                 /* clear wake-up status */
1764                 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1765                 if (ret < 0)
1766                         goto done;
1767
1768                 val &= ~PM_CTL_WOL_EN_;
1769                 val |= PM_CTL_WUPS_;
1770
1771                 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1772                 if (ret < 0)
1773                         goto done;
1774         }
1775
1776         ret = usbnet_resume(intf);
1777         if (ret < 0)
1778                 netdev_warn(dev->net, "usbnet_resume error\n");
1779
1780         phy_init_hw(pdata->phydev);
1781
1782 done:
1783         pdata->pm_task = NULL;
1784         return ret;
1785 }
1786
1787 static int smsc95xx_reset_resume(struct usb_interface *intf)
1788 {
1789         struct usbnet *dev = usb_get_intfdata(intf);
1790         struct smsc95xx_priv *pdata = dev->driver_priv;
1791         int ret;
1792
1793         pdata->pm_task = current;
1794         ret = smsc95xx_reset(dev);
1795         pdata->pm_task = NULL;
1796         if (ret < 0)
1797                 return ret;
1798
1799         return smsc95xx_resume(intf);
1800 }
1801
1802 static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1803 {
1804         skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
1805         skb->ip_summed = CHECKSUM_COMPLETE;
1806         skb_trim(skb, skb->len - 2);
1807 }
1808
1809 static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1810 {
1811         /* This check is no longer done by usbnet */
1812         if (skb->len < dev->net->hard_header_len)
1813                 return 0;
1814
1815         while (skb->len > 0) {
1816                 u32 header, align_count;
1817                 struct sk_buff *ax_skb;
1818                 unsigned char *packet;
1819                 u16 size;
1820
1821                 header = get_unaligned_le32(skb->data);
1822                 skb_pull(skb, 4 + NET_IP_ALIGN);
1823                 packet = skb->data;
1824
1825                 /* get the packet length */
1826                 size = (u16)((header & RX_STS_FL_) >> 16);
1827                 align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1828
1829                 if (unlikely(size > skb->len)) {
1830                         netif_dbg(dev, rx_err, dev->net,
1831                                   "size err header=0x%08x\n", header);
1832                         return 0;
1833                 }
1834
1835                 if (unlikely(header & RX_STS_ES_)) {
1836                         netif_dbg(dev, rx_err, dev->net,
1837                                   "Error header=0x%08x\n", header);
1838                         dev->net->stats.rx_errors++;
1839                         dev->net->stats.rx_dropped++;
1840
1841                         if (header & RX_STS_CRC_) {
1842                                 dev->net->stats.rx_crc_errors++;
1843                         } else {
1844                                 if (header & (RX_STS_TL_ | RX_STS_RF_))
1845                                         dev->net->stats.rx_frame_errors++;
1846
1847                                 if ((header & RX_STS_LE_) &&
1848                                         (!(header & RX_STS_FT_)))
1849                                         dev->net->stats.rx_length_errors++;
1850                         }
1851                 } else {
1852                         /* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1853                         if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1854                                 netif_dbg(dev, rx_err, dev->net,
1855                                           "size err header=0x%08x\n", header);
1856                                 return 0;
1857                         }
1858
1859                         /* last frame in this batch */
1860                         if (skb->len == size) {
1861                                 if (dev->net->features & NETIF_F_RXCSUM)
1862                                         smsc95xx_rx_csum_offload(skb);
1863                                 skb_trim(skb, skb->len - 4); /* remove fcs */
1864                                 skb->truesize = size + sizeof(struct sk_buff);
1865
1866                                 return 1;
1867                         }
1868
1869                         ax_skb = skb_clone(skb, GFP_ATOMIC);
1870                         if (unlikely(!ax_skb)) {
1871                                 netdev_warn(dev->net, "Error allocating skb\n");
1872                                 return 0;
1873                         }
1874
1875                         ax_skb->len = size;
1876                         ax_skb->data = packet;
1877                         skb_set_tail_pointer(ax_skb, size);
1878
1879                         if (dev->net->features & NETIF_F_RXCSUM)
1880                                 smsc95xx_rx_csum_offload(ax_skb);
1881                         skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1882                         ax_skb->truesize = size + sizeof(struct sk_buff);
1883
1884                         usbnet_skb_return(dev, ax_skb);
1885                 }
1886
1887                 skb_pull(skb, size);
1888
1889                 /* padding bytes before the next frame starts */
1890                 if (skb->len)
1891                         skb_pull(skb, align_count);
1892         }
1893
1894         return 1;
1895 }
1896
1897 static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1898 {
1899         u16 low_16 = (u16)skb_checksum_start_offset(skb);
1900         u16 high_16 = low_16 + skb->csum_offset;
1901         return (high_16 << 16) | low_16;
1902 }
1903
1904 /* The TX CSUM won't work if the checksum lies in the last 4 bytes of the
1905  * transmission. This is fairly unlikely, only seems to trigger with some
1906  * short TCP ACK packets sent.
1907  *
1908  * Note, this calculation should probably check for the alignment of the
1909  * data as well, but a straight check for csum being in the last four bytes
1910  * of the packet should be ok for now.
1911  */
1912 static bool smsc95xx_can_tx_checksum(struct sk_buff *skb)
1913 {
1914        unsigned int len = skb->len - skb_checksum_start_offset(skb);
1915
1916        if (skb->len <= 45)
1917                return false;
1918        return skb->csum_offset < (len - (4 + 1));
1919 }
1920
1921 static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1922                                          struct sk_buff *skb, gfp_t flags)
1923 {
1924         bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
1925         int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
1926         u32 tx_cmd_a, tx_cmd_b;
1927         void *ptr;
1928
1929         /* We do not advertise SG, so skbs should be already linearized */
1930         BUG_ON(skb_shinfo(skb)->nr_frags);
1931
1932         /* Make writable and expand header space by overhead if required */
1933         if (skb_cow_head(skb, overhead)) {
1934                 /* Must deallocate here as returning NULL to indicate error
1935                  * means the skb won't be deallocated in the caller.
1936                  */
1937                 dev_kfree_skb_any(skb);
1938                 return NULL;
1939         }
1940
1941         tx_cmd_b = (u32)skb->len;
1942         tx_cmd_a = tx_cmd_b | TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
1943
1944         if (csum) {
1945                 if (!smsc95xx_can_tx_checksum(skb)) {
1946                         /* workaround - hardware tx checksum does not work
1947                          * properly with extremely small packets */
1948                         long csstart = skb_checksum_start_offset(skb);
1949                         __wsum calc = csum_partial(skb->data + csstart,
1950                                 skb->len - csstart, 0);
1951                         *((__sum16 *)(skb->data + csstart
1952                                 + skb->csum_offset)) = csum_fold(calc);
1953
1954                         csum = false;
1955                 } else {
1956                         u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
1957                         ptr = skb_push(skb, 4);
1958                         put_unaligned_le32(csum_preamble, ptr);
1959
1960                         tx_cmd_a += 4;
1961                         tx_cmd_b += 4;
1962                         tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
1963                 }
1964         }
1965
1966         ptr = skb_push(skb, 8);
1967         put_unaligned_le32(tx_cmd_a, ptr);
1968         put_unaligned_le32(tx_cmd_b, ptr+4);
1969
1970         return skb;
1971 }
1972
1973 static int smsc95xx_manage_power(struct usbnet *dev, int on)
1974 {
1975         struct smsc95xx_priv *pdata = dev->driver_priv;
1976
1977         dev->intf->needs_remote_wakeup = on;
1978
1979         if (pdata->features & FEATURE_REMOTE_WAKEUP)
1980                 return 0;
1981
1982         /* this chip revision isn't capable of remote wakeup */
1983         netdev_info(dev->net, "hardware isn't capable of remote wakeup\n");
1984
1985         if (on)
1986                 usb_autopm_get_interface_no_resume(dev->intf);
1987         else
1988                 usb_autopm_put_interface(dev->intf);
1989
1990         return 0;
1991 }
1992
1993 static const struct driver_info smsc95xx_info = {
1994         .description    = "smsc95xx USB 2.0 Ethernet",
1995         .bind           = smsc95xx_bind,
1996         .unbind         = smsc95xx_unbind,
1997         .reset          = smsc95xx_reset,
1998         .check_connect  = smsc95xx_start_phy,
1999         .stop           = smsc95xx_stop,
2000         .rx_fixup       = smsc95xx_rx_fixup,
2001         .tx_fixup       = smsc95xx_tx_fixup,
2002         .status         = smsc95xx_status,
2003         .manage_power   = smsc95xx_manage_power,
2004         .flags          = FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
2005 };
2006
2007 static const struct usb_device_id products[] = {
2008         {
2009                 /* SMSC9500 USB Ethernet Device */
2010                 USB_DEVICE(0x0424, 0x9500),
2011                 .driver_info = (unsigned long) &smsc95xx_info,
2012         },
2013         {
2014                 /* SMSC9505 USB Ethernet Device */
2015                 USB_DEVICE(0x0424, 0x9505),
2016                 .driver_info = (unsigned long) &smsc95xx_info,
2017         },
2018         {
2019                 /* SMSC9500A USB Ethernet Device */
2020                 USB_DEVICE(0x0424, 0x9E00),
2021                 .driver_info = (unsigned long) &smsc95xx_info,
2022         },
2023         {
2024                 /* SMSC9505A USB Ethernet Device */
2025                 USB_DEVICE(0x0424, 0x9E01),
2026                 .driver_info = (unsigned long) &smsc95xx_info,
2027         },
2028         {
2029                 /* SMSC9512/9514 USB Hub & Ethernet Device */
2030                 USB_DEVICE(0x0424, 0xec00),
2031                 .driver_info = (unsigned long) &smsc95xx_info,
2032         },
2033         {
2034                 /* SMSC9500 USB Ethernet Device (SAL10) */
2035                 USB_DEVICE(0x0424, 0x9900),
2036                 .driver_info = (unsigned long) &smsc95xx_info,
2037         },
2038         {
2039                 /* SMSC9505 USB Ethernet Device (SAL10) */
2040                 USB_DEVICE(0x0424, 0x9901),
2041                 .driver_info = (unsigned long) &smsc95xx_info,
2042         },
2043         {
2044                 /* SMSC9500A USB Ethernet Device (SAL10) */
2045                 USB_DEVICE(0x0424, 0x9902),
2046                 .driver_info = (unsigned long) &smsc95xx_info,
2047         },
2048         {
2049                 /* SMSC9505A USB Ethernet Device (SAL10) */
2050                 USB_DEVICE(0x0424, 0x9903),
2051                 .driver_info = (unsigned long) &smsc95xx_info,
2052         },
2053         {
2054                 /* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
2055                 USB_DEVICE(0x0424, 0x9904),
2056                 .driver_info = (unsigned long) &smsc95xx_info,
2057         },
2058         {
2059                 /* SMSC9500A USB Ethernet Device (HAL) */
2060                 USB_DEVICE(0x0424, 0x9905),
2061                 .driver_info = (unsigned long) &smsc95xx_info,
2062         },
2063         {
2064                 /* SMSC9505A USB Ethernet Device (HAL) */
2065                 USB_DEVICE(0x0424, 0x9906),
2066                 .driver_info = (unsigned long) &smsc95xx_info,
2067         },
2068         {
2069                 /* SMSC9500 USB Ethernet Device (Alternate ID) */
2070                 USB_DEVICE(0x0424, 0x9907),
2071                 .driver_info = (unsigned long) &smsc95xx_info,
2072         },
2073         {
2074                 /* SMSC9500A USB Ethernet Device (Alternate ID) */
2075                 USB_DEVICE(0x0424, 0x9908),
2076                 .driver_info = (unsigned long) &smsc95xx_info,
2077         },
2078         {
2079                 /* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
2080                 USB_DEVICE(0x0424, 0x9909),
2081                 .driver_info = (unsigned long) &smsc95xx_info,
2082         },
2083         {
2084                 /* SMSC LAN9530 USB Ethernet Device */
2085                 USB_DEVICE(0x0424, 0x9530),
2086                 .driver_info = (unsigned long) &smsc95xx_info,
2087         },
2088         {
2089                 /* SMSC LAN9730 USB Ethernet Device */
2090                 USB_DEVICE(0x0424, 0x9730),
2091                 .driver_info = (unsigned long) &smsc95xx_info,
2092         },
2093         {
2094                 /* SMSC LAN89530 USB Ethernet Device */
2095                 USB_DEVICE(0x0424, 0x9E08),
2096                 .driver_info = (unsigned long) &smsc95xx_info,
2097         },
2098         { },            /* END */
2099 };
2100 MODULE_DEVICE_TABLE(usb, products);
2101
2102 static struct usb_driver smsc95xx_driver = {
2103         .name           = "smsc95xx",
2104         .id_table       = products,
2105         .probe          = usbnet_probe,
2106         .suspend        = smsc95xx_suspend,
2107         .resume         = smsc95xx_resume,
2108         .reset_resume   = smsc95xx_reset_resume,
2109         .disconnect     = usbnet_disconnect,
2110         .disable_hub_initiated_lpm = 1,
2111         .supports_autosuspend = 1,
2112 };
2113
2114 module_usb_driver(smsc95xx_driver);
2115
2116 MODULE_AUTHOR("Nancy Lin");
2117 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
2118 MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
2119 MODULE_LICENSE("GPL");