drivers/net/usb/smsc95xx.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2  /***************************************************************************
   3  *
   4  * Copyright (C) 2007-2008 SMSC
   5  *
   6  *****************************************************************************/
   7
   8 #include <linux/module.h>
   9 #include <linux/kmod.h>
  10 #include <linux/netdevice.h>
  11 #include <linux/etherdevice.h>
  12 #include <linux/ethtool.h>
  13 #include <linux/mii.h>
  14 #include <linux/usb.h>
  15 #include <linux/bitrev.h>
  16 #include <linux/crc16.h>
  17 #include <linux/crc32.h>
  18 #include <linux/usb/usbnet.h>
  19 #include <linux/slab.h>
  20 #include <linux/of_net.h>
  21 #include <linux/mdio.h>
  22 #include <linux/phy.h>
  23 #include "smsc95xx.h"
  24
  25 #define SMSC_CHIPNAME                   "smsc95xx"
  26 #define SMSC_DRIVER_VERSION             "2.0.0"
  27 #define HS_USB_PKT_SIZE                 (512)
  28 #define FS_USB_PKT_SIZE                 (64)
  29 #define DEFAULT_HS_BURST_CAP_SIZE       (16 * 1024 + 5 * HS_USB_PKT_SIZE)
  30 #define DEFAULT_FS_BURST_CAP_SIZE       (6 * 1024 + 33 * FS_USB_PKT_SIZE)
  31 #define DEFAULT_BULK_IN_DELAY           (0x00002000)
  32 #define MAX_SINGLE_PACKET_SIZE          (2048)
  33 #define LAN95XX_EEPROM_MAGIC            (0x9500)
  34 #define EEPROM_MAC_OFFSET               (0x01)
  35 #define DEFAULT_TX_CSUM_ENABLE          (true)
  36 #define DEFAULT_RX_CSUM_ENABLE          (true)
  37 #define SMSC95XX_INTERNAL_PHY_ID        (1)
  38 #define SMSC95XX_TX_OVERHEAD            (8)
  39 #define SMSC95XX_TX_OVERHEAD_CSUM       (12)
  40 #define SUPPORTED_WAKE                  (WAKE_PHY | WAKE_UCAST | WAKE_BCAST | \
  41                                          WAKE_MCAST | WAKE_ARP | WAKE_MAGIC)
  42
  43 #define FEATURE_8_WAKEUP_FILTERS        (0x01)
  44 #define FEATURE_PHY_NLP_CROSSOVER       (0x02)
  45 #define FEATURE_REMOTE_WAKEUP           (0x04)
  46
  47 #define SUSPEND_SUSPEND0                (0x01)
  48 #define SUSPEND_SUSPEND1                (0x02)
  49 #define SUSPEND_SUSPEND2                (0x04)
  50 #define SUSPEND_SUSPEND3                (0x08)
  51 #define SUSPEND_ALLMODES                (SUSPEND_SUSPEND0 | SUSPEND_SUSPEND1 | \
  52                                          SUSPEND_SUSPEND2 | SUSPEND_SUSPEND3)
  53
  54 struct smsc95xx_priv {
  55         u32 mac_cr;
  56         u32 hash_hi;
  57         u32 hash_lo;
  58         u32 wolopts;
  59         spinlock_t mac_cr_lock;
  60         u8 features;
  61         u8 suspend_flags;
  62         struct mii_bus *mdiobus;
  63         struct phy_device *phydev;
  64 };
  65
  66 static bool turbo_mode = true;
  67 module_param(turbo_mode, bool, 0644);
  68 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
  69
  70 static int __must_check __smsc95xx_read_reg(struct usbnet *dev, u32 index,
  71                                             u32 *data, int in_pm)
  72 {
  73         u32 buf;
  74         int ret;
  75         int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
  76
  77         BUG_ON(!dev);
  78
  79         if (!in_pm)
  80                 fn = usbnet_read_cmd;
  81         else
  82                 fn = usbnet_read_cmd_nopm;
  83
  84         ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
  85                  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  86                  0, index, &buf, 4);
  87         if (unlikely(ret < 0)) {
  88                 netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d\n",
  89                             index, ret);
  90                 return ret;
  91         }
  92
  93         le32_to_cpus(&buf);
  94         *data = buf;
  95
  96         return ret;
  97 }
  98
  99 static int __must_check __smsc95xx_write_reg(struct usbnet *dev, u32 index,
 100                                              u32 data, int in_pm)
 101 {
 102         u32 buf;
 103         int ret;
 104         int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
 105
 106         BUG_ON(!dev);
 107
 108         if (!in_pm)
 109                 fn = usbnet_write_cmd;
 110         else
 111                 fn = usbnet_write_cmd_nopm;
 112
 113         buf = data;
 114         cpu_to_le32s(&buf);
 115
 116         ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
 117                  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 118                  0, index, &buf, 4);
 119         if (unlikely(ret < 0))
 120                 netdev_warn(dev->net, "Failed to write reg index 0x%08x: %d\n",
 121                             index, ret);
 122
 123         return ret;
 124 }
 125
 126 static int __must_check smsc95xx_read_reg_nopm(struct usbnet *dev, u32 index,
 127                                                u32 *data)
 128 {
 129         return __smsc95xx_read_reg(dev, index, data, 1);
 130 }
 131
 132 static int __must_check smsc95xx_write_reg_nopm(struct usbnet *dev, u32 index,
 133                                                 u32 data)
 134 {
 135         return __smsc95xx_write_reg(dev, index, data, 1);
 136 }
 137
 138 static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
 139                                           u32 *data)
 140 {
 141         return __smsc95xx_read_reg(dev, index, data, 0);
 142 }
 143
 144 static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
 145                                            u32 data)
 146 {
 147         return __smsc95xx_write_reg(dev, index, data, 0);
 148 }
 149
 150 /* Loop until the read is completed with timeout
 151  * called with phy_mutex held */
 152 static int __must_check __smsc95xx_phy_wait_not_busy(struct usbnet *dev,
 153                                                      int in_pm)
 154 {
 155         unsigned long start_time = jiffies;
 156         u32 val;
 157         int ret;
 158
 159         do {
 160                 ret = __smsc95xx_read_reg(dev, MII_ADDR, &val, in_pm);
 161                 if (ret < 0) {
 162                         netdev_warn(dev->net, "Error reading MII_ACCESS\n");
 163                         return ret;
 164                 }
 165
 166                 if (!(val & MII_BUSY_))
 167                         return 0;
 168         } while (!time_after(jiffies, start_time + HZ));
 169
 170         return -EIO;
 171 }
 172
 173 static u32 mii_address_cmd(int phy_id, int idx, u16 op)
 174 {
 175         return (phy_id & 0x1f) << 11 | (idx & 0x1f) << 6 | op;
 176 }
 177
 178 static int __smsc95xx_mdio_read(struct usbnet *dev, int phy_id, int idx,
 179                                 int in_pm)
 180 {
 181         u32 val, addr;
 182         int ret;
 183
 184         mutex_lock(&dev->phy_mutex);
 185
 186         /* confirm MII not busy */
 187         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 188         if (ret < 0) {
 189                 netdev_warn(dev->net, "%s: MII is busy\n", __func__);
 190                 goto done;
 191         }
 192
 193         /* set the address, index & direction (read from PHY) */
 194         addr = mii_address_cmd(phy_id, idx, MII_READ_ | MII_BUSY_);
 195         ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
 196         if (ret < 0) {
 197                 netdev_warn(dev->net, "Error writing MII_ADDR\n");
 198                 goto done;
 199         }
 200
 201         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 202         if (ret < 0) {
 203                 netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
 204                 goto done;
 205         }
 206
 207         ret = __smsc95xx_read_reg(dev, MII_DATA, &val, in_pm);
 208         if (ret < 0) {
 209                 netdev_warn(dev->net, "Error reading MII_DATA\n");
 210                 goto done;
 211         }
 212
 213         ret = (u16)(val & 0xFFFF);
 214
 215 done:
 216         mutex_unlock(&dev->phy_mutex);
 217         return ret;
 218 }
 219
 220 static void __smsc95xx_mdio_write(struct usbnet *dev, int phy_id,
 221                                   int idx, int regval, int in_pm)
 222 {
 223         u32 val, addr;
 224         int ret;
 225
 226         mutex_lock(&dev->phy_mutex);
 227
 228         /* confirm MII not busy */
 229         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 230         if (ret < 0) {
 231                 netdev_warn(dev->net, "%s: MII is busy\n", __func__);
 232                 goto done;
 233         }
 234
 235         val = regval;
 236         ret = __smsc95xx_write_reg(dev, MII_DATA, val, in_pm);
 237         if (ret < 0) {
 238                 netdev_warn(dev->net, "Error writing MII_DATA\n");
 239                 goto done;
 240         }
 241
 242         /* set the address, index & direction (write to PHY) */
 243         addr = mii_address_cmd(phy_id, idx, MII_WRITE_ | MII_BUSY_);
 244         ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
 245         if (ret < 0) {
 246                 netdev_warn(dev->net, "Error writing MII_ADDR\n");
 247                 goto done;
 248         }
 249
 250         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 251         if (ret < 0) {
 252                 netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
 253                 goto done;
 254         }
 255
 256 done:
 257         mutex_unlock(&dev->phy_mutex);
 258 }
 259
 260 static int smsc95xx_mdio_read_nopm(struct usbnet *dev, int idx)
 261 {
 262         struct smsc95xx_priv *pdata = dev->driver_priv;
 263
 264         return __smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, idx, 1);
 265 }
 266
 267 static void smsc95xx_mdio_write_nopm(struct usbnet *dev, int idx, int regval)
 268 {
 269         struct smsc95xx_priv *pdata = dev->driver_priv;
 270
 271         __smsc95xx_mdio_write(dev, pdata->phydev->mdio.addr, idx, regval, 1);
 272 }
 273
 274 static int smsc95xx_mdiobus_read(struct mii_bus *bus, int phy_id, int idx)
 275 {
 276         struct usbnet *dev = bus->priv;
 277
 278         return __smsc95xx_mdio_read(dev, phy_id, idx, 0);
 279 }
 280
 281 static int smsc95xx_mdiobus_write(struct mii_bus *bus, int phy_id, int idx,
 282                                   u16 regval)
 283 {
 284         struct usbnet *dev = bus->priv;
 285
 286         __smsc95xx_mdio_write(dev, phy_id, idx, regval, 0);
 287         return 0;
 288 }
 289
 290 static int __must_check smsc95xx_wait_eeprom(struct usbnet *dev)
 291 {
 292         unsigned long start_time = jiffies;
 293         u32 val;
 294         int ret;
 295
 296         do {
 297                 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
 298                 if (ret < 0) {
 299                         netdev_warn(dev->net, "Error reading E2P_CMD\n");
 300                         return ret;
 301                 }
 302
 303                 if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
 304                         break;
 305                 udelay(40);
 306         } while (!time_after(jiffies, start_time + HZ));
 307
 308         if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
 309                 netdev_warn(dev->net, "EEPROM read operation timeout\n");
 310                 return -EIO;
 311         }
 312
 313         return 0;
 314 }
 315
 316 static int __must_check smsc95xx_eeprom_confirm_not_busy(struct usbnet *dev)
 317 {
 318         unsigned long start_time = jiffies;
 319         u32 val;
 320         int ret;
 321
 322         do {
 323                 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
 324                 if (ret < 0) {
 325                         netdev_warn(dev->net, "Error reading E2P_CMD\n");
 326                         return ret;
 327                 }
 328
 329                 if (!(val & E2P_CMD_BUSY_))
 330                         return 0;
 331
 332                 udelay(40);
 333         } while (!time_after(jiffies, start_time + HZ));
 334
 335         netdev_warn(dev->net, "EEPROM is busy\n");
 336         return -EIO;
 337 }
 338
 339 static int smsc95xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
 340                                 u8 *data)
 341 {
 342         u32 val;
 343         int i, ret;
 344
 345         BUG_ON(!dev);
 346         BUG_ON(!data);
 347
 348         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 349         if (ret)
 350                 return ret;
 351
 352         for (i = 0; i < length; i++) {
 353                 val = E2P_CMD_BUSY_ | E2P_CMD_READ_ | (offset & E2P_CMD_ADDR_);
 354                 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 355                 if (ret < 0) {
 356                         netdev_warn(dev->net, "Error writing E2P_CMD\n");
 357                         return ret;
 358                 }
 359
 360                 ret = smsc95xx_wait_eeprom(dev);
 361                 if (ret < 0)
 362                         return ret;
 363
 364                 ret = smsc95xx_read_reg(dev, E2P_DATA, &val);
 365                 if (ret < 0) {
 366                         netdev_warn(dev->net, "Error reading E2P_DATA\n");
 367                         return ret;
 368                 }
 369
 370                 data[i] = val & 0xFF;
 371                 offset++;
 372         }
 373
 374         return 0;
 375 }
 376
 377 static int smsc95xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
 378                                  u8 *data)
 379 {
 380         u32 val;
 381         int i, ret;
 382
 383         BUG_ON(!dev);
 384         BUG_ON(!data);
 385
 386         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 387         if (ret)
 388                 return ret;
 389
 390         /* Issue write/erase enable command */
 391         val = E2P_CMD_BUSY_ | E2P_CMD_EWEN_;
 392         ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 393         if (ret < 0) {
 394                 netdev_warn(dev->net, "Error writing E2P_DATA\n");
 395                 return ret;
 396         }
 397
 398         ret = smsc95xx_wait_eeprom(dev);
 399         if (ret < 0)
 400                 return ret;
 401
 402         for (i = 0; i < length; i++) {
 403
 404                 /* Fill data register */
 405                 val = data[i];
 406                 ret = smsc95xx_write_reg(dev, E2P_DATA, val);
 407                 if (ret < 0) {
 408                         netdev_warn(dev->net, "Error writing E2P_DATA\n");
 409                         return ret;
 410                 }
 411
 412                 /* Send "write" command */
 413                 val = E2P_CMD_BUSY_ | E2P_CMD_WRITE_ | (offset & E2P_CMD_ADDR_);
 414                 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 415                 if (ret < 0) {
 416                         netdev_warn(dev->net, "Error writing E2P_CMD\n");
 417                         return ret;
 418                 }
 419
 420                 ret = smsc95xx_wait_eeprom(dev);
 421                 if (ret < 0)
 422                         return ret;
 423
 424                 offset++;
 425         }
 426
 427         return 0;
 428 }
 429
 430 static int __must_check smsc95xx_write_reg_async(struct usbnet *dev, u16 index,
 431                                                  u32 data)
 432 {
 433         const u16 size = 4;
 434         u32 buf;
 435         int ret;
 436
 437         buf = data;
 438         cpu_to_le32s(&buf);
 439
 440         ret = usbnet_write_cmd_async(dev, USB_VENDOR_REQUEST_WRITE_REGISTER,
 441                                      USB_DIR_OUT | USB_TYPE_VENDOR |
 442                                      USB_RECIP_DEVICE,
 443                                      0, index, &buf, size);
 444         if (ret < 0)
 445                 netdev_warn(dev->net, "Error write async cmd, sts=%d\n",
 446                             ret);
 447         return ret;
 448 }
 449
 450 /* returns hash bit number for given MAC address
 451  * example:
 452  * 01 00 5E 00 00 01 -> returns bit number 31 */
 453 static unsigned int smsc95xx_hash(char addr[ETH_ALEN])
 454 {
 455         return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
 456 }
 457
 458 static void smsc95xx_set_multicast(struct net_device *netdev)
 459 {
 460         struct usbnet *dev = netdev_priv(netdev);
 461         struct smsc95xx_priv *pdata = dev->driver_priv;
 462         unsigned long flags;
 463         int ret;
 464
 465         pdata->hash_hi = 0;
 466         pdata->hash_lo = 0;
 467
 468         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 469
 470         if (dev->net->flags & IFF_PROMISC) {
 471                 netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
 472                 pdata->mac_cr |= MAC_CR_PRMS_;
 473                 pdata->mac_cr &= ~(MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 474         } else if (dev->net->flags & IFF_ALLMULTI) {
 475                 netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
 476                 pdata->mac_cr |= MAC_CR_MCPAS_;
 477                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_HPFILT_);
 478         } else if (!netdev_mc_empty(dev->net)) {
 479                 struct netdev_hw_addr *ha;
 480
 481                 pdata->mac_cr |= MAC_CR_HPFILT_;
 482                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);
 483
 484                 netdev_for_each_mc_addr(ha, netdev) {
 485                         u32 bitnum = smsc95xx_hash(ha->addr);
 486                         u32 mask = 0x01 << (bitnum & 0x1F);
 487                         if (bitnum & 0x20)
 488                                 pdata->hash_hi |= mask;
 489                         else
 490                                 pdata->hash_lo |= mask;
 491                 }
 492
 493                 netif_dbg(dev, drv, dev->net, "HASHH=0x%08X, HASHL=0x%08X\n",
 494                                    pdata->hash_hi, pdata->hash_lo);
 495         } else {
 496                 netif_dbg(dev, drv, dev->net, "receive own packets only\n");
 497                 pdata->mac_cr &=
 498                         ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 499         }
 500
 501         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 502
 503         /* Initiate async writes, as we can't wait for completion here */
 504         ret = smsc95xx_write_reg_async(dev, HASHH, pdata->hash_hi);
 505         if (ret < 0)
 506                 netdev_warn(dev->net, "failed to initiate async write to HASHH\n");
 507
 508         ret = smsc95xx_write_reg_async(dev, HASHL, pdata->hash_lo);
 509         if (ret < 0)
 510                 netdev_warn(dev->net, "failed to initiate async write to HASHL\n");
 511
 512         ret = smsc95xx_write_reg_async(dev, MAC_CR, pdata->mac_cr);
 513         if (ret < 0)
 514                 netdev_warn(dev->net, "failed to initiate async write to MAC_CR\n");
 515 }
 516
 517 static int smsc95xx_phy_update_flowcontrol(struct usbnet *dev)
 518 {
 519         u32 flow = 0, afc_cfg;
 520         struct smsc95xx_priv *pdata = dev->driver_priv;
 521         bool tx_pause, rx_pause;
 522
 523         int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
 524         if (ret < 0)
 525                 return ret;
 526
 527         if (pdata->phydev->duplex == DUPLEX_FULL) {
 528                 phy_get_pause(pdata->phydev, &tx_pause, &rx_pause);
 529
 530                 if (rx_pause)
 531                         flow = 0xFFFF0002;
 532
 533                 if (tx_pause) {
 534                         afc_cfg |= 0xF;
 535                         flow |= 0xFFFF0000;
 536                 } else {
 537                         afc_cfg &= ~0xF;
 538                 }
 539
 540                 netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
 541                           rx_pause ? "enabled" : "disabled",
 542                           tx_pause ? "enabled" : "disabled");
 543         } else {
 544                 netif_dbg(dev, link, dev->net, "half duplex\n");
 545                 afc_cfg |= 0xF;
 546         }
 547
 548         ret = smsc95xx_write_reg(dev, FLOW, flow);
 549         if (ret < 0)
 550                 return ret;
 551
 552         return smsc95xx_write_reg(dev, AFC_CFG, afc_cfg);
 553 }
 554
 555 static int smsc95xx_link_reset(struct usbnet *dev)
 556 {
 557         struct smsc95xx_priv *pdata = dev->driver_priv;
 558         unsigned long flags;
 559         int ret;
 560
 561         ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
 562         if (ret < 0)
 563                 return ret;
 564
 565         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 566         if (pdata->phydev->duplex != DUPLEX_FULL) {
 567                 pdata->mac_cr &= ~MAC_CR_FDPX_;
 568                 pdata->mac_cr |= MAC_CR_RCVOWN_;
 569         } else {
 570                 pdata->mac_cr &= ~MAC_CR_RCVOWN_;
 571                 pdata->mac_cr |= MAC_CR_FDPX_;
 572         }
 573         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 574
 575         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 576         if (ret < 0)
 577                 return ret;
 578
 579         ret = smsc95xx_phy_update_flowcontrol(dev);
 580         if (ret < 0)
 581                 netdev_warn(dev->net, "Error updating PHY flow control\n");
 582
 583         return ret;
 584 }
 585
 586 static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
 587 {
 588         u32 intdata;
 589
 590         if (urb->actual_length != 4) {
 591                 netdev_warn(dev->net, "unexpected urb length %d\n",
 592                             urb->actual_length);
 593                 return;
 594         }
 595
 596         intdata = get_unaligned_le32(urb->transfer_buffer);
 597         netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
 598
 599         if (intdata & INT_ENP_PHY_INT_)
 600                 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
 601         else
 602                 netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
 603                             intdata);
 604 }
 605
 606 /* Enable or disable Tx & Rx checksum offload engines */
 607 static int smsc95xx_set_features(struct net_device *netdev,
 608         netdev_features_t features)
 609 {
 610         struct usbnet *dev = netdev_priv(netdev);
 611         u32 read_buf;
 612         int ret;
 613
 614         ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
 615         if (ret < 0)
 616                 return ret;
 617
 618         if (features & NETIF_F_IP_CSUM)
 619                 read_buf |= Tx_COE_EN_;
 620         else
 621                 read_buf &= ~Tx_COE_EN_;
 622
 623         if (features & NETIF_F_RXCSUM)
 624                 read_buf |= Rx_COE_EN_;
 625         else
 626                 read_buf &= ~Rx_COE_EN_;
 627
 628         ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
 629         if (ret < 0)
 630                 return ret;
 631
 632         netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
 633         return 0;
 634 }
 635
 636 static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
 637 {
 638         return MAX_EEPROM_SIZE;
 639 }
 640
 641 static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
 642                                        struct ethtool_eeprom *ee, u8 *data)
 643 {
 644         struct usbnet *dev = netdev_priv(netdev);
 645
 646         ee->magic = LAN95XX_EEPROM_MAGIC;
 647
 648         return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
 649 }
 650
 651 static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
 652                                        struct ethtool_eeprom *ee, u8 *data)
 653 {
 654         struct usbnet *dev = netdev_priv(netdev);
 655
 656         if (ee->magic != LAN95XX_EEPROM_MAGIC) {
 657                 netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
 658                             ee->magic);
 659                 return -EINVAL;
 660         }
 661
 662         return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
 663 }
 664
 665 static int smsc95xx_ethtool_getregslen(struct net_device *netdev)
 666 {
 667         /* all smsc95xx registers */
 668         return COE_CR - ID_REV + sizeof(u32);
 669 }
 670
 671 static void
 672 smsc95xx_ethtool_getregs(struct net_device *netdev, struct ethtool_regs *regs,
 673                          void *buf)
 674 {
 675         struct usbnet *dev = netdev_priv(netdev);
 676         unsigned int i, j;
 677         int retval;
 678         u32 *data = buf;
 679
 680         retval = smsc95xx_read_reg(dev, ID_REV, &regs->version);
 681         if (retval < 0) {
 682                 netdev_warn(netdev, "REGS: cannot read ID_REV\n");
 683                 return;
 684         }
 685
 686         for (i = ID_REV, j = 0; i <= COE_CR; i += (sizeof(u32)), j++) {
 687                 retval = smsc95xx_read_reg(dev, i, &data[j]);
 688                 if (retval < 0) {
 689                         netdev_warn(netdev, "REGS: cannot read reg[%x]\n", i);
 690                         return;
 691                 }
 692         }
 693 }
 694
 695 static void smsc95xx_ethtool_get_wol(struct net_device *net,
 696                                      struct ethtool_wolinfo *wolinfo)
 697 {
 698         struct usbnet *dev = netdev_priv(net);
 699         struct smsc95xx_priv *pdata = dev->driver_priv;
 700
 701         wolinfo->supported = SUPPORTED_WAKE;
 702         wolinfo->wolopts = pdata->wolopts;
 703 }
 704
 705 static int smsc95xx_ethtool_set_wol(struct net_device *net,
 706                                     struct ethtool_wolinfo *wolinfo)
 707 {
 708         struct usbnet *dev = netdev_priv(net);
 709         struct smsc95xx_priv *pdata = dev->driver_priv;
 710         int ret;
 711
 712         if (wolinfo->wolopts & ~SUPPORTED_WAKE)
 713                 return -EINVAL;
 714
 715         pdata->wolopts = wolinfo->wolopts & SUPPORTED_WAKE;
 716
 717         ret = device_set_wakeup_enable(&dev->udev->dev, pdata->wolopts);
 718         if (ret < 0)
 719                 netdev_warn(dev->net, "device_set_wakeup_enable error %d\n", ret);
 720
 721         return ret;
 722 }
 723
 724 static u32 smsc95xx_get_link(struct net_device *net)
 725 {
 726         phy_read_status(net->phydev);
 727         return net->phydev->link;
 728 }
 729
 730 static const struct ethtool_ops smsc95xx_ethtool_ops = {
 731         .get_link       = smsc95xx_get_link,
 732         .nway_reset     = phy_ethtool_nway_reset,
 733         .get_drvinfo    = usbnet_get_drvinfo,
 734         .get_msglevel   = usbnet_get_msglevel,
 735         .set_msglevel   = usbnet_set_msglevel,
 736         .get_eeprom_len = smsc95xx_ethtool_get_eeprom_len,
 737         .get_eeprom     = smsc95xx_ethtool_get_eeprom,
 738         .set_eeprom     = smsc95xx_ethtool_set_eeprom,
 739         .get_regs_len   = smsc95xx_ethtool_getregslen,
 740         .get_regs       = smsc95xx_ethtool_getregs,
 741         .get_wol        = smsc95xx_ethtool_get_wol,
 742         .set_wol        = smsc95xx_ethtool_set_wol,
 743         .get_link_ksettings     = phy_ethtool_get_link_ksettings,
 744         .set_link_ksettings     = phy_ethtool_set_link_ksettings,
 745         .get_ts_info    = ethtool_op_get_ts_info,
 746 };
 747
 748 static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
 749 {
 750         if (!netif_running(netdev))
 751                 return -EINVAL;
 752
 753         return phy_mii_ioctl(netdev->phydev, rq, cmd);
 754 }
 755
 756 static void smsc95xx_init_mac_address(struct usbnet *dev)
 757 {
 758         /* maybe the boot loader passed the MAC address in devicetree */
 759         if (!eth_platform_get_mac_address(&dev->udev->dev,
 760                         dev->net->dev_addr)) {
 761                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 762                         /* device tree values are valid so use them */
 763                         netif_dbg(dev, ifup, dev->net, "MAC address read from the device tree\n");
 764                         return;
 765                 }
 766         }
 767
 768         /* try reading mac address from EEPROM */
 769         if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
 770                         dev->net->dev_addr) == 0) {
 771                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 772                         /* eeprom values are valid so use them */
 773                         netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
 774                         return;
 775                 }
 776         }
 777
 778         /* no useful static MAC address found. generate a random one */
 779         eth_hw_addr_random(dev->net);
 780         netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
 781 }
 782
 783 static int smsc95xx_set_mac_address(struct usbnet *dev)
 784 {
 785         u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
 786                 dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
 787         u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
 788         int ret;
 789
 790         ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
 791         if (ret < 0)
 792                 return ret;
 793
 794         return smsc95xx_write_reg(dev, ADDRH, addr_hi);
 795 }
 796
 797 /* starts the TX path */
 798 static int smsc95xx_start_tx_path(struct usbnet *dev)
 799 {
 800         struct smsc95xx_priv *pdata = dev->driver_priv;
 801         unsigned long flags;
 802         int ret;
 803
 804         /* Enable Tx at MAC */
 805         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 806         pdata->mac_cr |= MAC_CR_TXEN_;
 807         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 808
 809         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 810         if (ret < 0)
 811                 return ret;
 812
 813         /* Enable Tx at SCSRs */
 814         return smsc95xx_write_reg(dev, TX_CFG, TX_CFG_ON_);
 815 }
 816
 817 /* Starts the Receive path */
 818 static int smsc95xx_start_rx_path(struct usbnet *dev, int in_pm)
 819 {
 820         struct smsc95xx_priv *pdata = dev->driver_priv;
 821         unsigned long flags;
 822
 823         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 824         pdata->mac_cr |= MAC_CR_RXEN_;
 825         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 826
 827         return __smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr, in_pm);
 828 }
 829
 830 static int smsc95xx_reset(struct usbnet *dev)
 831 {
 832         struct smsc95xx_priv *pdata = dev->driver_priv;
 833         u32 read_buf, write_buf, burst_cap;
 834         int ret = 0, timeout;
 835
 836         netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
 837
 838         ret = smsc95xx_write_reg(dev, HW_CFG, HW_CFG_LRST_);
 839         if (ret < 0)
 840                 return ret;
 841
 842         timeout = 0;
 843         do {
 844                 msleep(10);
 845                 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 846                 if (ret < 0)
 847                         return ret;
 848                 timeout++;
 849         } while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
 850
 851         if (timeout >= 100) {
 852                 netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
 853                 return ret;
 854         }
 855
 856         ret = smsc95xx_write_reg(dev, PM_CTRL, PM_CTL_PHY_RST_);
 857         if (ret < 0)
 858                 return ret;
 859
 860         timeout = 0;
 861         do {
 862                 msleep(10);
 863                 ret = smsc95xx_read_reg(dev, PM_CTRL, &read_buf);
 864                 if (ret < 0)
 865                         return ret;
 866                 timeout++;
 867         } while ((read_buf & PM_CTL_PHY_RST_) && (timeout < 100));
 868
 869         if (timeout >= 100) {
 870                 netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
 871                 return ret;
 872         }
 873
 874         ret = smsc95xx_set_mac_address(dev);
 875         if (ret < 0)
 876                 return ret;
 877
 878         netif_dbg(dev, ifup, dev->net, "MAC Address: %pM\n",
 879                   dev->net->dev_addr);
 880
 881         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 882         if (ret < 0)
 883                 return ret;
 884
 885         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x\n",
 886                   read_buf);
 887
 888         read_buf |= HW_CFG_BIR_;
 889
 890         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 891         if (ret < 0)
 892                 return ret;
 893
 894         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 895         if (ret < 0)
 896                 return ret;
 897
 898         netif_dbg(dev, ifup, dev->net,
 899                   "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
 900                   read_buf);
 901
 902         if (!turbo_mode) {
 903                 burst_cap = 0;
 904                 dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
 905         } else if (dev->udev->speed == USB_SPEED_HIGH) {
 906                 burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
 907                 dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
 908         } else {
 909                 burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
 910                 dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
 911         }
 912
 913         netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld\n",
 914                   (ulong)dev->rx_urb_size);
 915
 916         ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
 917         if (ret < 0)
 918                 return ret;
 919
 920         ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
 921         if (ret < 0)
 922                 return ret;
 923
 924         netif_dbg(dev, ifup, dev->net,
 925                   "Read Value from BURST_CAP after writing: 0x%08x\n",
 926                   read_buf);
 927
 928         ret = smsc95xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
 929         if (ret < 0)
 930                 return ret;
 931
 932         ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
 933         if (ret < 0)
 934                 return ret;
 935
 936         netif_dbg(dev, ifup, dev->net,
 937                   "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
 938                   read_buf);
 939
 940         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 941         if (ret < 0)
 942                 return ret;
 943
 944         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG: 0x%08x\n",
 945                   read_buf);
 946
 947         if (turbo_mode)
 948                 read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
 949
 950         read_buf &= ~HW_CFG_RXDOFF_;
 951
 952         /* set Rx data offset=2, Make IP header aligns on word boundary. */
 953         read_buf |= NET_IP_ALIGN << 9;
 954
 955         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 956         if (ret < 0)
 957                 return ret;
 958
 959         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 960         if (ret < 0)
 961                 return ret;
 962
 963         netif_dbg(dev, ifup, dev->net,
 964                   "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
 965
 966         ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
 967         if (ret < 0)
 968                 return ret;
 969
 970         ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
 971         if (ret < 0)
 972                 return ret;
 973         netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
 974
 975         /* Configure GPIO pins as LED outputs */
 976         write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
 977                 LED_GPIO_CFG_FDX_LED;
 978         ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
 979         if (ret < 0)
 980                 return ret;
 981
 982         /* Init Tx */
 983         ret = smsc95xx_write_reg(dev, FLOW, 0);
 984         if (ret < 0)
 985                 return ret;
 986
 987         ret = smsc95xx_write_reg(dev, AFC_CFG, AFC_CFG_DEFAULT);
 988         if (ret < 0)
 989                 return ret;
 990
 991         /* Don't need mac_cr_lock during initialisation */
 992         ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
 993         if (ret < 0)
 994                 return ret;
 995
 996         /* Init Rx */
 997         /* Set Vlan */
 998         ret = smsc95xx_write_reg(dev, VLAN1, (u32)ETH_P_8021Q);
 999         if (ret < 0)
1000                 return ret;
1001
1002         /* Enable or disable checksum offload engines */
1003         ret = smsc95xx_set_features(dev->net, dev->net->features);
1004         if (ret < 0) {
1005                 netdev_warn(dev->net, "Failed to set checksum offload features\n");
1006                 return ret;
1007         }
1008
1009         smsc95xx_set_multicast(dev->net);
1010
1011         ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
1012         if (ret < 0)
1013                 return ret;
1014
1015         /* enable PHY interrupts */
1016         read_buf |= INT_EP_CTL_PHY_INT_;
1017
1018         ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
1019         if (ret < 0)
1020                 return ret;
1021
1022         ret = smsc95xx_start_tx_path(dev);
1023         if (ret < 0) {
1024                 netdev_warn(dev->net, "Failed to start TX path\n");
1025                 return ret;
1026         }
1027
1028         ret = smsc95xx_start_rx_path(dev, 0);
1029         if (ret < 0) {
1030                 netdev_warn(dev->net, "Failed to start RX path\n");
1031                 return ret;
1032         }
1033
1034         netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1035         return 0;
1036 }
1037
1038 static const struct net_device_ops smsc95xx_netdev_ops = {
1039         .ndo_open               = usbnet_open,
1040         .ndo_stop               = usbnet_stop,
1041         .ndo_start_xmit         = usbnet_start_xmit,
1042         .ndo_tx_timeout         = usbnet_tx_timeout,
1043         .ndo_change_mtu         = usbnet_change_mtu,
1044         .ndo_get_stats64        = dev_get_tstats64,
1045         .ndo_set_mac_address    = eth_mac_addr,
1046         .ndo_validate_addr      = eth_validate_addr,
1047         .ndo_eth_ioctl          = smsc95xx_ioctl,
1048         .ndo_set_rx_mode        = smsc95xx_set_multicast,
1049         .ndo_set_features       = smsc95xx_set_features,
1050 };
1051
1052 static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1053 {
1054         struct smsc95xx_priv *pdata;
1055         bool is_internal_phy;
1056         u32 val;
1057         int ret;
1058
1059         printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1060
1061         ret = usbnet_get_endpoints(dev, intf);
1062         if (ret < 0) {
1063                 netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1064                 return ret;
1065         }
1066
1067         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
1068         if (!pdata)
1069                 return -ENOMEM;
1070
1071         dev->driver_priv = pdata;
1072
1073         spin_lock_init(&pdata->mac_cr_lock);
1074
1075         /* LAN95xx devices do not alter the computed checksum of 0 to 0xffff.
1076          * RFC 2460, ipv6 UDP calculated checksum yields a result of zero must
1077          * be changed to 0xffff. RFC 768, ipv4 UDP computed checksum is zero,
1078          * it is transmitted as all ones. The zero transmitted checksum means
1079          * transmitter generated no checksum. Hence, enable csum offload only
1080          * for ipv4 packets.
1081          */
1082         if (DEFAULT_TX_CSUM_ENABLE)
1083                 dev->net->features |= NETIF_F_IP_CSUM;
1084         if (DEFAULT_RX_CSUM_ENABLE)
1085                 dev->net->features |= NETIF_F_RXCSUM;
1086
1087         dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1088         set_bit(EVENT_NO_IP_ALIGN, &dev->flags);
1089
1090         smsc95xx_init_mac_address(dev);
1091
1092         /* Init all registers */
1093         ret = smsc95xx_reset(dev);
1094         if (ret)
1095                 goto free_pdata;
1096
1097         pdata->mdiobus = mdiobus_alloc();
1098         if (!pdata->mdiobus) {
1099                 ret = -ENOMEM;
1100                 goto free_pdata;
1101         }
1102
1103         ret = smsc95xx_read_reg(dev, HW_CFG, &val);
1104         if (ret < 0)
1105                 goto free_mdio;
1106
1107         is_internal_phy = !(val & HW_CFG_PSEL_);
1108         if (is_internal_phy)
1109                 pdata->mdiobus->phy_mask = ~(1u << SMSC95XX_INTERNAL_PHY_ID);
1110
1111         pdata->mdiobus->priv = dev;
1112         pdata->mdiobus->read = smsc95xx_mdiobus_read;
1113         pdata->mdiobus->write = smsc95xx_mdiobus_write;
1114         pdata->mdiobus->name = "smsc95xx-mdiobus";
1115         pdata->mdiobus->parent = &dev->udev->dev;
1116
1117         snprintf(pdata->mdiobus->id, ARRAY_SIZE(pdata->mdiobus->id),
1118                  "usb-%03d:%03d", dev->udev->bus->busnum, dev->udev->devnum);
1119
1120         ret = mdiobus_register(pdata->mdiobus);
1121         if (ret) {
1122                 netdev_err(dev->net, "Could not register MDIO bus\n");
1123                 goto free_mdio;
1124         }
1125
1126         pdata->phydev = phy_find_first(pdata->mdiobus);
1127         if (!pdata->phydev) {
1128                 netdev_err(dev->net, "no PHY found\n");
1129                 ret = -ENODEV;
1130                 goto unregister_mdio;
1131         }
1132
1133         pdata->phydev->is_internal = is_internal_phy;
1134
1135         /* detect device revision as different features may be available */
1136         ret = smsc95xx_read_reg(dev, ID_REV, &val);
1137         if (ret < 0)
1138                 goto unregister_mdio;
1139
1140         val >>= 16;
1141         if ((val == ID_REV_CHIP_ID_9500A_) || (val == ID_REV_CHIP_ID_9530_) ||
1142             (val == ID_REV_CHIP_ID_89530_) || (val == ID_REV_CHIP_ID_9730_))
1143                 pdata->features = (FEATURE_8_WAKEUP_FILTERS |
1144                         FEATURE_PHY_NLP_CROSSOVER |
1145                         FEATURE_REMOTE_WAKEUP);
1146         else if (val == ID_REV_CHIP_ID_9512_)
1147                 pdata->features = FEATURE_8_WAKEUP_FILTERS;
1148
1149         dev->net->netdev_ops = &smsc95xx_netdev_ops;
1150         dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1151         dev->net->flags |= IFF_MULTICAST;
1152         dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
1153         dev->net->min_mtu = ETH_MIN_MTU;
1154         dev->net->max_mtu = ETH_DATA_LEN;
1155         dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
1156         return 0;
1157
1158 unregister_mdio:
1159         mdiobus_unregister(pdata->mdiobus);
1160
1161 free_mdio:
1162         mdiobus_free(pdata->mdiobus);
1163
1164 free_pdata:
1165         kfree(pdata);
1166         return ret;
1167 }
1168
1169 static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1170 {
1171         struct smsc95xx_priv *pdata = dev->driver_priv;
1172
1173         mdiobus_unregister(pdata->mdiobus);
1174         mdiobus_free(pdata->mdiobus);
1175         netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1176         kfree(pdata);
1177 }
1178
1179 static void smsc95xx_handle_link_change(struct net_device *net)
1180 {
1181         struct usbnet *dev = netdev_priv(net);
1182
1183         phy_print_status(net->phydev);
1184         usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1185 }
1186
1187 static int smsc95xx_start_phy(struct usbnet *dev)
1188 {
1189         struct smsc95xx_priv *pdata = dev->driver_priv;
1190         struct net_device *net = dev->net;
1191         int ret;
1192
1193         ret = smsc95xx_reset(dev);
1194         if (ret < 0)
1195                 return ret;
1196
1197         ret = phy_connect_direct(net, pdata->phydev,
1198                                  &smsc95xx_handle_link_change,
1199                                  PHY_INTERFACE_MODE_MII);
1200         if (ret) {
1201                 netdev_err(net, "can't attach PHY to %s\n", pdata->mdiobus->id);
1202                 return ret;
1203         }
1204
1205         phy_attached_info(net->phydev);
1206         phy_start(net->phydev);
1207         return 0;
1208 }
1209
1210 static int smsc95xx_disconnect_phy(struct usbnet *dev)
1211 {
1212         phy_stop(dev->net->phydev);
1213         phy_disconnect(dev->net->phydev);
1214         return 0;
1215 }
1216
1217 static u32 smsc_crc(const u8 *buffer, size_t len, int filter)
1218 {
1219         u32 crc = bitrev16(crc16(0xFFFF, buffer, len));
1220         return crc << ((filter % 2) * 16);
1221 }
1222
1223 static int smsc95xx_enable_phy_wakeup_interrupts(struct usbnet *dev, u16 mask)
1224 {
1225         int ret;
1226
1227         netdev_dbg(dev->net, "enabling PHY wakeup interrupts\n");
1228
1229         /* read to clear */
1230         ret = smsc95xx_mdio_read_nopm(dev, PHY_INT_SRC);
1231         if (ret < 0)
1232                 return ret;
1233
1234         /* enable interrupt source */
1235         ret = smsc95xx_mdio_read_nopm(dev, PHY_INT_MASK);
1236         if (ret < 0)
1237                 return ret;
1238
1239         ret |= mask;
1240
1241         smsc95xx_mdio_write_nopm(dev, PHY_INT_MASK, ret);
1242
1243         return 0;
1244 }
1245
1246 static int smsc95xx_link_ok_nopm(struct usbnet *dev)
1247 {
1248         int ret;
1249
1250         /* first, a dummy read, needed to latch some MII phys */
1251         ret = smsc95xx_mdio_read_nopm(dev, MII_BMSR);
1252         if (ret < 0)
1253                 return ret;
1254
1255         ret = smsc95xx_mdio_read_nopm(dev, MII_BMSR);
1256         if (ret < 0)
1257                 return ret;
1258
1259         return !!(ret & BMSR_LSTATUS);
1260 }
1261
1262 static int smsc95xx_enter_suspend0(struct usbnet *dev)
1263 {
1264         struct smsc95xx_priv *pdata = dev->driver_priv;
1265         u32 val;
1266         int ret;
1267
1268         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1269         if (ret < 0)
1270                 return ret;
1271
1272         val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
1273         val |= PM_CTL_SUS_MODE_0;
1274
1275         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1276         if (ret < 0)
1277                 return ret;
1278
1279         /* clear wol status */
1280         val &= ~PM_CTL_WUPS_;
1281         val |= PM_CTL_WUPS_WOL_;
1282
1283         /* enable energy detection */
1284         if (pdata->wolopts & WAKE_PHY)
1285                 val |= PM_CTL_WUPS_ED_;
1286
1287         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1288         if (ret < 0)
1289                 return ret;
1290
1291         /* read back PM_CTRL */
1292         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1293         if (ret < 0)
1294                 return ret;
1295
1296         pdata->suspend_flags |= SUSPEND_SUSPEND0;
1297
1298         return 0;
1299 }
1300
1301 static int smsc95xx_enter_suspend1(struct usbnet *dev)
1302 {
1303         struct smsc95xx_priv *pdata = dev->driver_priv;
1304         u32 val;
1305         int ret;
1306
1307         /* reconfigure link pulse detection timing for
1308          * compatibility with non-standard link partners
1309          */
1310         if (pdata->features & FEATURE_PHY_NLP_CROSSOVER)
1311                 smsc95xx_mdio_write_nopm(dev, PHY_EDPD_CONFIG,
1312                                          PHY_EDPD_CONFIG_DEFAULT);
1313
1314         /* enable energy detect power-down mode */
1315         ret = smsc95xx_mdio_read_nopm(dev, PHY_MODE_CTRL_STS);
1316         if (ret < 0)
1317                 return ret;
1318
1319         ret |= MODE_CTRL_STS_EDPWRDOWN_;
1320
1321         smsc95xx_mdio_write_nopm(dev, PHY_MODE_CTRL_STS, ret);
1322
1323         /* enter SUSPEND1 mode */
1324         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1325         if (ret < 0)
1326                 return ret;
1327
1328         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1329         val |= PM_CTL_SUS_MODE_1;
1330
1331         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1332         if (ret < 0)
1333                 return ret;
1334
1335         /* clear wol status, enable energy detection */
1336         val &= ~PM_CTL_WUPS_;
1337         val |= (PM_CTL_WUPS_ED_ | PM_CTL_ED_EN_);
1338
1339         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1340         if (ret < 0)
1341                 return ret;
1342
1343         pdata->suspend_flags |= SUSPEND_SUSPEND1;
1344
1345         return 0;
1346 }
1347
1348 static int smsc95xx_enter_suspend2(struct usbnet *dev)
1349 {
1350         struct smsc95xx_priv *pdata = dev->driver_priv;
1351         u32 val;
1352         int ret;
1353
1354         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1355         if (ret < 0)
1356                 return ret;
1357
1358         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1359         val |= PM_CTL_SUS_MODE_2;
1360
1361         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1362         if (ret < 0)
1363                 return ret;
1364
1365         pdata->suspend_flags |= SUSPEND_SUSPEND2;
1366
1367         return 0;
1368 }
1369
1370 static int smsc95xx_enter_suspend3(struct usbnet *dev)
1371 {
1372         struct smsc95xx_priv *pdata = dev->driver_priv;
1373         u32 val;
1374         int ret;
1375
1376         ret = smsc95xx_read_reg_nopm(dev, RX_FIFO_INF, &val);
1377         if (ret < 0)
1378                 return ret;
1379
1380         if (val & RX_FIFO_INF_USED_) {
1381                 netdev_info(dev->net, "rx fifo not empty in autosuspend\n");
1382                 return -EBUSY;
1383         }
1384
1385         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1386         if (ret < 0)
1387                 return ret;
1388
1389         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1390         val |= PM_CTL_SUS_MODE_3 | PM_CTL_RES_CLR_WKP_STS;
1391
1392         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1393         if (ret < 0)
1394                 return ret;
1395
1396         /* clear wol status */
1397         val &= ~PM_CTL_WUPS_;
1398         val |= PM_CTL_WUPS_WOL_;
1399
1400         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1401         if (ret < 0)
1402                 return ret;
1403
1404         pdata->suspend_flags |= SUSPEND_SUSPEND3;
1405
1406         return 0;
1407 }
1408
1409 static int smsc95xx_autosuspend(struct usbnet *dev, u32 link_up)
1410 {
1411         struct smsc95xx_priv *pdata = dev->driver_priv;
1412         int ret;
1413
1414         if (!netif_running(dev->net)) {
1415                 /* interface is ifconfig down so fully power down hw */
1416                 netdev_dbg(dev->net, "autosuspend entering SUSPEND2\n");
1417                 return smsc95xx_enter_suspend2(dev);
1418         }
1419
1420         if (!link_up) {
1421                 /* link is down so enter EDPD mode, but only if device can
1422                  * reliably resume from it.  This check should be redundant
1423                  * as current FEATURE_REMOTE_WAKEUP parts also support
1424                  * FEATURE_PHY_NLP_CROSSOVER but it's included for clarity */
1425                 if (!(pdata->features & FEATURE_PHY_NLP_CROSSOVER)) {
1426                         netdev_warn(dev->net, "EDPD not supported\n");
1427                         return -EBUSY;
1428                 }
1429
1430                 netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n");
1431
1432                 /* enable PHY wakeup events for if cable is attached */
1433                 ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1434                         PHY_INT_MASK_ANEG_COMP_);
1435                 if (ret < 0) {
1436                         netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1437                         return ret;
1438                 }
1439
1440                 netdev_info(dev->net, "entering SUSPEND1 mode\n");
1441                 return smsc95xx_enter_suspend1(dev);
1442         }
1443
1444         /* enable PHY wakeup events so we remote wakeup if cable is pulled */
1445         ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1446                 PHY_INT_MASK_LINK_DOWN_);
1447         if (ret < 0) {
1448                 netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1449                 return ret;
1450         }
1451
1452         netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n");
1453         return smsc95xx_enter_suspend3(dev);
1454 }
1455
1456 static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
1457 {
1458         struct usbnet *dev = usb_get_intfdata(intf);
1459         struct smsc95xx_priv *pdata = dev->driver_priv;
1460         u32 val, link_up;
1461         int ret;
1462
1463         ret = usbnet_suspend(intf, message);
1464         if (ret < 0) {
1465                 netdev_warn(dev->net, "usbnet_suspend error\n");
1466                 return ret;
1467         }
1468
1469         if (pdata->suspend_flags) {
1470                 netdev_warn(dev->net, "error during last resume\n");
1471                 pdata->suspend_flags = 0;
1472         }
1473
1474         /* determine if link is up using only _nopm functions */
1475         link_up = smsc95xx_link_ok_nopm(dev);
1476
1477         if (message.event == PM_EVENT_AUTO_SUSPEND &&
1478             (pdata->features & FEATURE_REMOTE_WAKEUP)) {
1479                 ret = smsc95xx_autosuspend(dev, link_up);
1480                 goto done;
1481         }
1482
1483         /* if we get this far we're not autosuspending */
1484         /* if no wol options set, or if link is down and we're not waking on
1485          * PHY activity, enter lowest power SUSPEND2 mode
1486          */
1487         if (!(pdata->wolopts & SUPPORTED_WAKE) ||
1488                 !(link_up || (pdata->wolopts & WAKE_PHY))) {
1489                 netdev_info(dev->net, "entering SUSPEND2 mode\n");
1490
1491                 /* disable energy detect (link up) & wake up events */
1492                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1493                 if (ret < 0)
1494                         goto done;
1495
1496                 val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
1497
1498                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1499                 if (ret < 0)
1500                         goto done;
1501
1502                 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1503                 if (ret < 0)
1504                         goto done;
1505
1506                 val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
1507
1508                 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1509                 if (ret < 0)
1510                         goto done;
1511
1512                 ret = smsc95xx_enter_suspend2(dev);
1513                 goto done;
1514         }
1515
1516         if (pdata->wolopts & WAKE_PHY) {
1517                 ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1518                         (PHY_INT_MASK_ANEG_COMP_ | PHY_INT_MASK_LINK_DOWN_));
1519                 if (ret < 0) {
1520                         netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1521                         goto done;
1522                 }
1523
1524                 /* if link is down then configure EDPD and enter SUSPEND1,
1525                  * otherwise enter SUSPEND0 below
1526                  */
1527                 if (!link_up) {
1528                         netdev_info(dev->net, "entering SUSPEND1 mode\n");
1529                         ret = smsc95xx_enter_suspend1(dev);
1530                         goto done;
1531                 }
1532         }
1533
1534         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1535                 u32 *filter_mask = kcalloc(32, sizeof(u32), GFP_KERNEL);
1536                 u32 command[2];
1537                 u32 offset[2];
1538                 u32 crc[4];
1539                 int wuff_filter_count =
1540                         (pdata->features & FEATURE_8_WAKEUP_FILTERS) ?
1541                         LAN9500A_WUFF_NUM : LAN9500_WUFF_NUM;
1542                 int i, filter = 0;
1543
1544                 if (!filter_mask) {
1545                         netdev_warn(dev->net, "Unable to allocate filter_mask\n");
1546                         ret = -ENOMEM;
1547                         goto done;
1548                 }
1549
1550                 memset(command, 0, sizeof(command));
1551                 memset(offset, 0, sizeof(offset));
1552                 memset(crc, 0, sizeof(crc));
1553
1554                 if (pdata->wolopts & WAKE_BCAST) {
1555                         const u8 bcast[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
1556                         netdev_info(dev->net, "enabling broadcast detection\n");
1557                         filter_mask[filter * 4] = 0x003F;
1558                         filter_mask[filter * 4 + 1] = 0x00;
1559                         filter_mask[filter * 4 + 2] = 0x00;
1560                         filter_mask[filter * 4 + 3] = 0x00;
1561                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1562                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1563                         crc[filter/2] |= smsc_crc(bcast, 6, filter);
1564                         filter++;
1565                 }
1566
1567                 if (pdata->wolopts & WAKE_MCAST) {
1568                         const u8 mcast[] = {0x01, 0x00, 0x5E};
1569                         netdev_info(dev->net, "enabling multicast detection\n");
1570                         filter_mask[filter * 4] = 0x0007;
1571                         filter_mask[filter * 4 + 1] = 0x00;
1572                         filter_mask[filter * 4 + 2] = 0x00;
1573                         filter_mask[filter * 4 + 3] = 0x00;
1574                         command[filter/4] |= 0x09UL << ((filter % 4) * 8);
1575                         offset[filter/4] |= 0x00  << ((filter % 4) * 8);
1576                         crc[filter/2] |= smsc_crc(mcast, 3, filter);
1577                         filter++;
1578                 }
1579
1580                 if (pdata->wolopts & WAKE_ARP) {
1581                         const u8 arp[] = {0x08, 0x06};
1582                         netdev_info(dev->net, "enabling ARP detection\n");
1583                         filter_mask[filter * 4] = 0x0003;
1584                         filter_mask[filter * 4 + 1] = 0x00;
1585                         filter_mask[filter * 4 + 2] = 0x00;
1586                         filter_mask[filter * 4 + 3] = 0x00;
1587                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1588                         offset[filter/4] |= 0x0C << ((filter % 4) * 8);
1589                         crc[filter/2] |= smsc_crc(arp, 2, filter);
1590                         filter++;
1591                 }
1592
1593                 if (pdata->wolopts & WAKE_UCAST) {
1594                         netdev_info(dev->net, "enabling unicast detection\n");
1595                         filter_mask[filter * 4] = 0x003F;
1596                         filter_mask[filter * 4 + 1] = 0x00;
1597                         filter_mask[filter * 4 + 2] = 0x00;
1598                         filter_mask[filter * 4 + 3] = 0x00;
1599                         command[filter/4] |= 0x01UL << ((filter % 4) * 8);
1600                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1601                         crc[filter/2] |= smsc_crc(dev->net->dev_addr, ETH_ALEN, filter);
1602                         filter++;
1603                 }
1604
1605                 for (i = 0; i < (wuff_filter_count * 4); i++) {
1606                         ret = smsc95xx_write_reg_nopm(dev, WUFF, filter_mask[i]);
1607                         if (ret < 0) {
1608                                 kfree(filter_mask);
1609                                 goto done;
1610                         }
1611                 }
1612                 kfree(filter_mask);
1613
1614                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1615                         ret = smsc95xx_write_reg_nopm(dev, WUFF, command[i]);
1616                         if (ret < 0)
1617                                 goto done;
1618                 }
1619
1620                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1621                         ret = smsc95xx_write_reg_nopm(dev, WUFF, offset[i]);
1622                         if (ret < 0)
1623                                 goto done;
1624                 }
1625
1626                 for (i = 0; i < (wuff_filter_count / 2); i++) {
1627                         ret = smsc95xx_write_reg_nopm(dev, WUFF, crc[i]);
1628                         if (ret < 0)
1629                                 goto done;
1630                 }
1631
1632                 /* clear any pending pattern match packet status */
1633                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1634                 if (ret < 0)
1635                         goto done;
1636
1637                 val |= WUCSR_WUFR_;
1638
1639                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1640                 if (ret < 0)
1641                         goto done;
1642         }
1643
1644         if (pdata->wolopts & WAKE_MAGIC) {
1645                 /* clear any pending magic packet status */
1646                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1647                 if (ret < 0)
1648                         goto done;
1649
1650                 val |= WUCSR_MPR_;
1651
1652                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1653                 if (ret < 0)
1654                         goto done;
1655         }
1656
1657         /* enable/disable wakeup sources */
1658         ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1659         if (ret < 0)
1660                 goto done;
1661
1662         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1663                 netdev_info(dev->net, "enabling pattern match wakeup\n");
1664                 val |= WUCSR_WAKE_EN_;
1665         } else {
1666                 netdev_info(dev->net, "disabling pattern match wakeup\n");
1667                 val &= ~WUCSR_WAKE_EN_;
1668         }
1669
1670         if (pdata->wolopts & WAKE_MAGIC) {
1671                 netdev_info(dev->net, "enabling magic packet wakeup\n");
1672                 val |= WUCSR_MPEN_;
1673         } else {
1674                 netdev_info(dev->net, "disabling magic packet wakeup\n");
1675                 val &= ~WUCSR_MPEN_;
1676         }
1677
1678         ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1679         if (ret < 0)
1680                 goto done;
1681
1682         /* enable wol wakeup source */
1683         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1684         if (ret < 0)
1685                 goto done;
1686
1687         val |= PM_CTL_WOL_EN_;
1688
1689         /* phy energy detect wakeup source */
1690         if (pdata->wolopts & WAKE_PHY)
1691                 val |= PM_CTL_ED_EN_;
1692
1693         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1694         if (ret < 0)
1695                 goto done;
1696
1697         /* enable receiver to enable frame reception */
1698         smsc95xx_start_rx_path(dev, 1);
1699
1700         /* some wol options are enabled, so enter SUSPEND0 */
1701         netdev_info(dev->net, "entering SUSPEND0 mode\n");
1702         ret = smsc95xx_enter_suspend0(dev);
1703
1704 done:
1705         /*
1706          * TODO: resume() might need to handle the suspend failure
1707          * in system sleep
1708          */
1709         if (ret && PMSG_IS_AUTO(message))
1710                 usbnet_resume(intf);
1711
1712         return ret;
1713 }
1714
1715 static int smsc95xx_resume(struct usb_interface *intf)
1716 {
1717         struct usbnet *dev = usb_get_intfdata(intf);
1718         struct smsc95xx_priv *pdata;
1719         u8 suspend_flags;
1720         int ret;
1721         u32 val;
1722
1723         BUG_ON(!dev);
1724         pdata = dev->driver_priv;
1725         suspend_flags = pdata->suspend_flags;
1726
1727         netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags);
1728
1729         /* do this first to ensure it's cleared even in error case */
1730         pdata->suspend_flags = 0;
1731
1732         if (suspend_flags & SUSPEND_ALLMODES) {
1733                 /* clear wake-up sources */
1734                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1735                 if (ret < 0)
1736                         return ret;
1737
1738                 val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
1739
1740                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1741                 if (ret < 0)
1742                         return ret;
1743
1744                 /* clear wake-up status */
1745                 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1746                 if (ret < 0)
1747                         return ret;
1748
1749                 val &= ~PM_CTL_WOL_EN_;
1750                 val |= PM_CTL_WUPS_;
1751
1752                 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1753                 if (ret < 0)
1754                         return ret;
1755         }
1756
1757         ret = usbnet_resume(intf);
1758         if (ret < 0)
1759                 netdev_warn(dev->net, "usbnet_resume error\n");
1760
1761         phy_init_hw(pdata->phydev);
1762         return ret;
1763 }
1764
1765 static int smsc95xx_reset_resume(struct usb_interface *intf)
1766 {
1767         struct usbnet *dev = usb_get_intfdata(intf);
1768         int ret;
1769
1770         ret = smsc95xx_reset(dev);
1771         if (ret < 0)
1772                 return ret;
1773
1774         return smsc95xx_resume(intf);
1775 }
1776
1777 static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1778 {
1779         skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
1780         skb->ip_summed = CHECKSUM_COMPLETE;
1781         skb_trim(skb, skb->len - 2);
1782 }
1783
1784 static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1785 {
1786         /* This check is no longer done by usbnet */
1787         if (skb->len < dev->net->hard_header_len)
1788                 return 0;
1789
1790         while (skb->len > 0) {
1791                 u32 header, align_count;
1792                 struct sk_buff *ax_skb;
1793                 unsigned char *packet;
1794                 u16 size;
1795
1796                 header = get_unaligned_le32(skb->data);
1797                 skb_pull(skb, 4 + NET_IP_ALIGN);
1798                 packet = skb->data;
1799
1800                 /* get the packet length */
1801                 size = (u16)((header & RX_STS_FL_) >> 16);
1802                 align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1803
1804                 if (unlikely(header & RX_STS_ES_)) {
1805                         netif_dbg(dev, rx_err, dev->net,
1806                                   "Error header=0x%08x\n", header);
1807                         dev->net->stats.rx_errors++;
1808                         dev->net->stats.rx_dropped++;
1809
1810                         if (header & RX_STS_CRC_) {
1811                                 dev->net->stats.rx_crc_errors++;
1812                         } else {
1813                                 if (header & (RX_STS_TL_ | RX_STS_RF_))
1814                                         dev->net->stats.rx_frame_errors++;
1815
1816                                 if ((header & RX_STS_LE_) &&
1817                                         (!(header & RX_STS_FT_)))
1818                                         dev->net->stats.rx_length_errors++;
1819                         }
1820                 } else {
1821                         /* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1822                         if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1823                                 netif_dbg(dev, rx_err, dev->net,
1824                                           "size err header=0x%08x\n", header);
1825                                 return 0;
1826                         }
1827
1828                         /* last frame in this batch */
1829                         if (skb->len == size) {
1830                                 if (dev->net->features & NETIF_F_RXCSUM)
1831                                         smsc95xx_rx_csum_offload(skb);
1832                                 skb_trim(skb, skb->len - 4); /* remove fcs */
1833                                 skb->truesize = size + sizeof(struct sk_buff);
1834
1835                                 return 1;
1836                         }
1837
1838                         ax_skb = skb_clone(skb, GFP_ATOMIC);
1839                         if (unlikely(!ax_skb)) {
1840                                 netdev_warn(dev->net, "Error allocating skb\n");
1841                                 return 0;
1842                         }
1843
1844                         ax_skb->len = size;
1845                         ax_skb->data = packet;
1846                         skb_set_tail_pointer(ax_skb, size);
1847
1848                         if (dev->net->features & NETIF_F_RXCSUM)
1849                                 smsc95xx_rx_csum_offload(ax_skb);
1850                         skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1851                         ax_skb->truesize = size + sizeof(struct sk_buff);
1852
1853                         usbnet_skb_return(dev, ax_skb);
1854                 }
1855
1856                 skb_pull(skb, size);
1857
1858                 /* padding bytes before the next frame starts */
1859                 if (skb->len)
1860                         skb_pull(skb, align_count);
1861         }
1862
1863         return 1;
1864 }
1865
1866 static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1867 {
1868         u16 low_16 = (u16)skb_checksum_start_offset(skb);
1869         u16 high_16 = low_16 + skb->csum_offset;
1870         return (high_16 << 16) | low_16;
1871 }
1872
1873 /* The TX CSUM won't work if the checksum lies in the last 4 bytes of the
1874  * transmission. This is fairly unlikely, only seems to trigger with some
1875  * short TCP ACK packets sent.
1876  *
1877  * Note, this calculation should probably check for the alignment of the
1878  * data as well, but a straight check for csum being in the last four bytes
1879  * of the packet should be ok for now.
1880  */
1881 static bool smsc95xx_can_tx_checksum(struct sk_buff *skb)
1882 {
1883        unsigned int len = skb->len - skb_checksum_start_offset(skb);
1884
1885        if (skb->len <= 45)
1886                return false;
1887        return skb->csum_offset < (len - (4 + 1));
1888 }
1889
1890 static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1891                                          struct sk_buff *skb, gfp_t flags)
1892 {
1893         bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
1894         int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
1895         u32 tx_cmd_a, tx_cmd_b;
1896         void *ptr;
1897
1898         /* We do not advertise SG, so skbs should be already linearized */
1899         BUG_ON(skb_shinfo(skb)->nr_frags);
1900
1901         /* Make writable and expand header space by overhead if required */
1902         if (skb_cow_head(skb, overhead)) {
1903                 /* Must deallocate here as returning NULL to indicate error
1904                  * means the skb won't be deallocated in the caller.
1905                  */
1906                 dev_kfree_skb_any(skb);
1907                 return NULL;
1908         }
1909
1910         tx_cmd_b = (u32)skb->len;
1911         tx_cmd_a = tx_cmd_b | TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
1912
1913         if (csum) {
1914                 if (!smsc95xx_can_tx_checksum(skb)) {
1915                         /* workaround - hardware tx checksum does not work
1916                          * properly with extremely small packets */
1917                         long csstart = skb_checksum_start_offset(skb);
1918                         __wsum calc = csum_partial(skb->data + csstart,
1919                                 skb->len - csstart, 0);
1920                         *((__sum16 *)(skb->data + csstart
1921                                 + skb->csum_offset)) = csum_fold(calc);
1922
1923                         csum = false;
1924                 } else {
1925                         u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
1926                         ptr = skb_push(skb, 4);
1927                         put_unaligned_le32(csum_preamble, ptr);
1928
1929                         tx_cmd_a += 4;
1930                         tx_cmd_b += 4;
1931                         tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
1932                 }
1933         }
1934
1935         ptr = skb_push(skb, 8);
1936         put_unaligned_le32(tx_cmd_a, ptr);
1937         put_unaligned_le32(tx_cmd_b, ptr+4);
1938
1939         return skb;
1940 }
1941
1942 static int smsc95xx_manage_power(struct usbnet *dev, int on)
1943 {
1944         struct smsc95xx_priv *pdata = dev->driver_priv;
1945
1946         dev->intf->needs_remote_wakeup = on;
1947
1948         if (pdata->features & FEATURE_REMOTE_WAKEUP)
1949                 return 0;
1950
1951         /* this chip revision isn't capable of remote wakeup */
1952         netdev_info(dev->net, "hardware isn't capable of remote wakeup\n");
1953
1954         if (on)
1955                 usb_autopm_get_interface_no_resume(dev->intf);
1956         else
1957                 usb_autopm_put_interface(dev->intf);
1958
1959         return 0;
1960 }
1961
1962 static const struct driver_info smsc95xx_info = {
1963         .description    = "smsc95xx USB 2.0 Ethernet",
1964         .bind           = smsc95xx_bind,
1965         .unbind         = smsc95xx_unbind,
1966         .link_reset     = smsc95xx_link_reset,
1967         .reset          = smsc95xx_start_phy,
1968         .stop           = smsc95xx_disconnect_phy,
1969         .rx_fixup       = smsc95xx_rx_fixup,
1970         .tx_fixup       = smsc95xx_tx_fixup,
1971         .status         = smsc95xx_status,
1972         .manage_power   = smsc95xx_manage_power,
1973         .flags          = FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
1974 };
1975
1976 static const struct usb_device_id products[] = {
1977         {
1978                 /* SMSC9500 USB Ethernet Device */
1979                 USB_DEVICE(0x0424, 0x9500),
1980                 .driver_info = (unsigned long) &smsc95xx_info,
1981         },
1982         {
1983                 /* SMSC9505 USB Ethernet Device */
1984                 USB_DEVICE(0x0424, 0x9505),
1985                 .driver_info = (unsigned long) &smsc95xx_info,
1986         },
1987         {
1988                 /* SMSC9500A USB Ethernet Device */
1989                 USB_DEVICE(0x0424, 0x9E00),
1990                 .driver_info = (unsigned long) &smsc95xx_info,
1991         },
1992         {
1993                 /* SMSC9505A USB Ethernet Device */
1994                 USB_DEVICE(0x0424, 0x9E01),
1995                 .driver_info = (unsigned long) &smsc95xx_info,
1996         },
1997         {
1998                 /* SMSC9512/9514 USB Hub & Ethernet Device */
1999                 USB_DEVICE(0x0424, 0xec00),
2000                 .driver_info = (unsigned long) &smsc95xx_info,
2001         },
2002         {
2003                 /* SMSC9500 USB Ethernet Device (SAL10) */
2004                 USB_DEVICE(0x0424, 0x9900),
2005                 .driver_info = (unsigned long) &smsc95xx_info,
2006         },
2007         {
2008                 /* SMSC9505 USB Ethernet Device (SAL10) */
2009                 USB_DEVICE(0x0424, 0x9901),
2010                 .driver_info = (unsigned long) &smsc95xx_info,
2011         },
2012         {
2013                 /* SMSC9500A USB Ethernet Device (SAL10) */
2014                 USB_DEVICE(0x0424, 0x9902),
2015                 .driver_info = (unsigned long) &smsc95xx_info,
2016         },
2017         {
2018                 /* SMSC9505A USB Ethernet Device (SAL10) */
2019                 USB_DEVICE(0x0424, 0x9903),
2020                 .driver_info = (unsigned long) &smsc95xx_info,
2021         },
2022         {
2023                 /* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
2024                 USB_DEVICE(0x0424, 0x9904),
2025                 .driver_info = (unsigned long) &smsc95xx_info,
2026         },
2027         {
2028                 /* SMSC9500A USB Ethernet Device (HAL) */
2029                 USB_DEVICE(0x0424, 0x9905),
2030                 .driver_info = (unsigned long) &smsc95xx_info,
2031         },
2032         {
2033                 /* SMSC9505A USB Ethernet Device (HAL) */
2034                 USB_DEVICE(0x0424, 0x9906),
2035                 .driver_info = (unsigned long) &smsc95xx_info,
2036         },
2037         {
2038                 /* SMSC9500 USB Ethernet Device (Alternate ID) */
2039                 USB_DEVICE(0x0424, 0x9907),
2040                 .driver_info = (unsigned long) &smsc95xx_info,
2041         },
2042         {
2043                 /* SMSC9500A USB Ethernet Device (Alternate ID) */
2044                 USB_DEVICE(0x0424, 0x9908),
2045                 .driver_info = (unsigned long) &smsc95xx_info,
2046         },
2047         {
2048                 /* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
2049                 USB_DEVICE(0x0424, 0x9909),
2050                 .driver_info = (unsigned long) &smsc95xx_info,
2051         },
2052         {
2053                 /* SMSC LAN9530 USB Ethernet Device */
2054                 USB_DEVICE(0x0424, 0x9530),
2055                 .driver_info = (unsigned long) &smsc95xx_info,
2056         },
2057         {
2058                 /* SMSC LAN9730 USB Ethernet Device */
2059                 USB_DEVICE(0x0424, 0x9730),
2060                 .driver_info = (unsigned long) &smsc95xx_info,
2061         },
2062         {
2063                 /* SMSC LAN89530 USB Ethernet Device */
2064                 USB_DEVICE(0x0424, 0x9E08),
2065                 .driver_info = (unsigned long) &smsc95xx_info,
2066         },
2067         { },            /* END */
2068 };
2069 MODULE_DEVICE_TABLE(usb, products);
2070
2071 static struct usb_driver smsc95xx_driver = {
2072         .name           = "smsc95xx",
2073         .id_table       = products,
2074         .probe          = usbnet_probe,
2075         .suspend        = smsc95xx_suspend,
2076         .resume         = smsc95xx_resume,
2077         .reset_resume   = smsc95xx_reset_resume,
2078         .disconnect     = usbnet_disconnect,
2079         .disable_hub_initiated_lpm = 1,
2080         .supports_autosuspend = 1,
2081 };
2082
2083 module_usb_driver(smsc95xx_driver);
2084
2085 MODULE_AUTHOR("Nancy Lin");
2086 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
2087 MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
2088 MODULE_LICENSE("GPL");