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         u8 addr[ETH_ALEN];
 759
 760         /* maybe the boot loader passed the MAC address in devicetree */
 761         if (!platform_get_ethdev_address(&dev->udev->dev, dev->net)) {
 762                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 763                         /* device tree values are valid so use them */
 764                         netif_dbg(dev, ifup, dev->net, "MAC address read from the device tree\n");
 765                         return;
 766                 }
 767         }
 768
 769         /* try reading mac address from EEPROM */
 770         if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN, addr) == 0) {
 771                 eth_hw_addr_set(dev->net, addr);
 772                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 773                         /* eeprom values are valid so use them */
 774                         netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
 775                         return;
 776                 }
 777         }
 778
 779         /* no useful static MAC address found. generate a random one */
 780         eth_hw_addr_random(dev->net);
 781         netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
 782 }
 783
 784 static int smsc95xx_set_mac_address(struct usbnet *dev)
 785 {
 786         u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
 787                 dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
 788         u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
 789         int ret;
 790
 791         ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
 792         if (ret < 0)
 793                 return ret;
 794
 795         return smsc95xx_write_reg(dev, ADDRH, addr_hi);
 796 }
 797
 798 /* starts the TX path */
 799 static int smsc95xx_start_tx_path(struct usbnet *dev)
 800 {
 801         struct smsc95xx_priv *pdata = dev->driver_priv;
 802         unsigned long flags;
 803         int ret;
 804
 805         /* Enable Tx at MAC */
 806         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 807         pdata->mac_cr |= MAC_CR_TXEN_;
 808         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 809
 810         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 811         if (ret < 0)
 812                 return ret;
 813
 814         /* Enable Tx at SCSRs */
 815         return smsc95xx_write_reg(dev, TX_CFG, TX_CFG_ON_);
 816 }
 817
 818 /* Starts the Receive path */
 819 static int smsc95xx_start_rx_path(struct usbnet *dev, int in_pm)
 820 {
 821         struct smsc95xx_priv *pdata = dev->driver_priv;
 822         unsigned long flags;
 823
 824         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 825         pdata->mac_cr |= MAC_CR_RXEN_;
 826         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 827
 828         return __smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr, in_pm);
 829 }
 830
 831 static int smsc95xx_reset(struct usbnet *dev)
 832 {
 833         struct smsc95xx_priv *pdata = dev->driver_priv;
 834         u32 read_buf, write_buf, burst_cap;
 835         int ret = 0, timeout;
 836
 837         netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
 838
 839         ret = smsc95xx_write_reg(dev, HW_CFG, HW_CFG_LRST_);
 840         if (ret < 0)
 841                 return ret;
 842
 843         timeout = 0;
 844         do {
 845                 msleep(10);
 846                 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 847                 if (ret < 0)
 848                         return ret;
 849                 timeout++;
 850         } while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
 851
 852         if (timeout >= 100) {
 853                 netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
 854                 return ret;
 855         }
 856
 857         ret = smsc95xx_write_reg(dev, PM_CTRL, PM_CTL_PHY_RST_);
 858         if (ret < 0)
 859                 return ret;
 860
 861         timeout = 0;
 862         do {
 863                 msleep(10);
 864                 ret = smsc95xx_read_reg(dev, PM_CTRL, &read_buf);
 865                 if (ret < 0)
 866                         return ret;
 867                 timeout++;
 868         } while ((read_buf & PM_CTL_PHY_RST_) && (timeout < 100));
 869
 870         if (timeout >= 100) {
 871                 netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
 872                 return ret;
 873         }
 874
 875         ret = smsc95xx_set_mac_address(dev);
 876         if (ret < 0)
 877                 return ret;
 878
 879         netif_dbg(dev, ifup, dev->net, "MAC Address: %pM\n",
 880                   dev->net->dev_addr);
 881
 882         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 883         if (ret < 0)
 884                 return ret;
 885
 886         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x\n",
 887                   read_buf);
 888
 889         read_buf |= HW_CFG_BIR_;
 890
 891         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 892         if (ret < 0)
 893                 return ret;
 894
 895         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 896         if (ret < 0)
 897                 return ret;
 898
 899         netif_dbg(dev, ifup, dev->net,
 900                   "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
 901                   read_buf);
 902
 903         if (!turbo_mode) {
 904                 burst_cap = 0;
 905                 dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
 906         } else if (dev->udev->speed == USB_SPEED_HIGH) {
 907                 burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
 908                 dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
 909         } else {
 910                 burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
 911                 dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
 912         }
 913
 914         netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld\n",
 915                   (ulong)dev->rx_urb_size);
 916
 917         ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
 918         if (ret < 0)
 919                 return ret;
 920
 921         ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
 922         if (ret < 0)
 923                 return ret;
 924
 925         netif_dbg(dev, ifup, dev->net,
 926                   "Read Value from BURST_CAP after writing: 0x%08x\n",
 927                   read_buf);
 928
 929         ret = smsc95xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
 930         if (ret < 0)
 931                 return ret;
 932
 933         ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
 934         if (ret < 0)
 935                 return ret;
 936
 937         netif_dbg(dev, ifup, dev->net,
 938                   "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
 939                   read_buf);
 940
 941         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 942         if (ret < 0)
 943                 return ret;
 944
 945         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG: 0x%08x\n",
 946                   read_buf);
 947
 948         if (turbo_mode)
 949                 read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
 950
 951         read_buf &= ~HW_CFG_RXDOFF_;
 952
 953         /* set Rx data offset=2, Make IP header aligns on word boundary. */
 954         read_buf |= NET_IP_ALIGN << 9;
 955
 956         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 957         if (ret < 0)
 958                 return ret;
 959
 960         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 961         if (ret < 0)
 962                 return ret;
 963
 964         netif_dbg(dev, ifup, dev->net,
 965                   "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
 966
 967         ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
 968         if (ret < 0)
 969                 return ret;
 970
 971         ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
 972         if (ret < 0)
 973                 return ret;
 974         netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
 975
 976         /* Configure GPIO pins as LED outputs */
 977         write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
 978                 LED_GPIO_CFG_FDX_LED;
 979         ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
 980         if (ret < 0)
 981                 return ret;
 982
 983         /* Init Tx */
 984         ret = smsc95xx_write_reg(dev, FLOW, 0);
 985         if (ret < 0)
 986                 return ret;
 987
 988         ret = smsc95xx_write_reg(dev, AFC_CFG, AFC_CFG_DEFAULT);
 989         if (ret < 0)
 990                 return ret;
 991
 992         /* Don't need mac_cr_lock during initialisation */
 993         ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
 994         if (ret < 0)
 995                 return ret;
 996
 997         /* Init Rx */
 998         /* Set Vlan */
 999         ret = smsc95xx_write_reg(dev, VLAN1, (u32)ETH_P_8021Q);
1000         if (ret < 0)
1001                 return ret;
1002
1003         /* Enable or disable checksum offload engines */
1004         ret = smsc95xx_set_features(dev->net, dev->net->features);
1005         if (ret < 0) {
1006                 netdev_warn(dev->net, "Failed to set checksum offload features\n");
1007                 return ret;
1008         }
1009
1010         smsc95xx_set_multicast(dev->net);
1011
1012         ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
1013         if (ret < 0)
1014                 return ret;
1015
1016         /* enable PHY interrupts */
1017         read_buf |= INT_EP_CTL_PHY_INT_;
1018
1019         ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
1020         if (ret < 0)
1021                 return ret;
1022
1023         ret = smsc95xx_start_tx_path(dev);
1024         if (ret < 0) {
1025                 netdev_warn(dev->net, "Failed to start TX path\n");
1026                 return ret;
1027         }
1028
1029         ret = smsc95xx_start_rx_path(dev, 0);
1030         if (ret < 0) {
1031                 netdev_warn(dev->net, "Failed to start RX path\n");
1032                 return ret;
1033         }
1034
1035         netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1036         return 0;
1037 }
1038
1039 static const struct net_device_ops smsc95xx_netdev_ops = {
1040         .ndo_open               = usbnet_open,
1041         .ndo_stop               = usbnet_stop,
1042         .ndo_start_xmit         = usbnet_start_xmit,
1043         .ndo_tx_timeout         = usbnet_tx_timeout,
1044         .ndo_change_mtu         = usbnet_change_mtu,
1045         .ndo_get_stats64        = dev_get_tstats64,
1046         .ndo_set_mac_address    = eth_mac_addr,
1047         .ndo_validate_addr      = eth_validate_addr,
1048         .ndo_eth_ioctl          = smsc95xx_ioctl,
1049         .ndo_set_rx_mode        = smsc95xx_set_multicast,
1050         .ndo_set_features       = smsc95xx_set_features,
1051 };
1052
1053 static void smsc95xx_handle_link_change(struct net_device *net)
1054 {
1055         struct usbnet *dev = netdev_priv(net);
1056
1057         phy_print_status(net->phydev);
1058         usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1059 }
1060
1061 static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1062 {
1063         struct smsc95xx_priv *pdata;
1064         bool is_internal_phy;
1065         u32 val;
1066         int ret;
1067
1068         printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1069
1070         ret = usbnet_get_endpoints(dev, intf);
1071         if (ret < 0) {
1072                 netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1073                 return ret;
1074         }
1075
1076         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
1077         if (!pdata)
1078                 return -ENOMEM;
1079
1080         dev->driver_priv = pdata;
1081
1082         spin_lock_init(&pdata->mac_cr_lock);
1083
1084         /* LAN95xx devices do not alter the computed checksum of 0 to 0xffff.
1085          * RFC 2460, ipv6 UDP calculated checksum yields a result of zero must
1086          * be changed to 0xffff. RFC 768, ipv4 UDP computed checksum is zero,
1087          * it is transmitted as all ones. The zero transmitted checksum means
1088          * transmitter generated no checksum. Hence, enable csum offload only
1089          * for ipv4 packets.
1090          */
1091         if (DEFAULT_TX_CSUM_ENABLE)
1092                 dev->net->features |= NETIF_F_IP_CSUM;
1093         if (DEFAULT_RX_CSUM_ENABLE)
1094                 dev->net->features |= NETIF_F_RXCSUM;
1095
1096         dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1097         set_bit(EVENT_NO_IP_ALIGN, &dev->flags);
1098
1099         smsc95xx_init_mac_address(dev);
1100
1101         /* Init all registers */
1102         ret = smsc95xx_reset(dev);
1103         if (ret)
1104                 goto free_pdata;
1105
1106         pdata->mdiobus = mdiobus_alloc();
1107         if (!pdata->mdiobus) {
1108                 ret = -ENOMEM;
1109                 goto free_pdata;
1110         }
1111
1112         ret = smsc95xx_read_reg(dev, HW_CFG, &val);
1113         if (ret < 0)
1114                 goto free_mdio;
1115
1116         is_internal_phy = !(val & HW_CFG_PSEL_);
1117         if (is_internal_phy)
1118                 pdata->mdiobus->phy_mask = ~(1u << SMSC95XX_INTERNAL_PHY_ID);
1119
1120         pdata->mdiobus->priv = dev;
1121         pdata->mdiobus->read = smsc95xx_mdiobus_read;
1122         pdata->mdiobus->write = smsc95xx_mdiobus_write;
1123         pdata->mdiobus->name = "smsc95xx-mdiobus";
1124         pdata->mdiobus->parent = &dev->udev->dev;
1125
1126         snprintf(pdata->mdiobus->id, ARRAY_SIZE(pdata->mdiobus->id),
1127                  "usb-%03d:%03d", dev->udev->bus->busnum, dev->udev->devnum);
1128
1129         ret = mdiobus_register(pdata->mdiobus);
1130         if (ret) {
1131                 netdev_err(dev->net, "Could not register MDIO bus\n");
1132                 goto free_mdio;
1133         }
1134
1135         pdata->phydev = phy_find_first(pdata->mdiobus);
1136         if (!pdata->phydev) {
1137                 netdev_err(dev->net, "no PHY found\n");
1138                 ret = -ENODEV;
1139                 goto unregister_mdio;
1140         }
1141
1142         pdata->phydev->is_internal = is_internal_phy;
1143
1144         /* detect device revision as different features may be available */
1145         ret = smsc95xx_read_reg(dev, ID_REV, &val);
1146         if (ret < 0)
1147                 goto unregister_mdio;
1148
1149         val >>= 16;
1150         if ((val == ID_REV_CHIP_ID_9500A_) || (val == ID_REV_CHIP_ID_9530_) ||
1151             (val == ID_REV_CHIP_ID_89530_) || (val == ID_REV_CHIP_ID_9730_))
1152                 pdata->features = (FEATURE_8_WAKEUP_FILTERS |
1153                         FEATURE_PHY_NLP_CROSSOVER |
1154                         FEATURE_REMOTE_WAKEUP);
1155         else if (val == ID_REV_CHIP_ID_9512_)
1156                 pdata->features = FEATURE_8_WAKEUP_FILTERS;
1157
1158         dev->net->netdev_ops = &smsc95xx_netdev_ops;
1159         dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1160         dev->net->flags |= IFF_MULTICAST;
1161         dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
1162         dev->net->min_mtu = ETH_MIN_MTU;
1163         dev->net->max_mtu = ETH_DATA_LEN;
1164         dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
1165
1166         ret = phy_connect_direct(dev->net, pdata->phydev,
1167                                  &smsc95xx_handle_link_change,
1168                                  PHY_INTERFACE_MODE_MII);
1169         if (ret) {
1170                 netdev_err(dev->net, "can't attach PHY to %s\n", pdata->mdiobus->id);
1171                 goto unregister_mdio;
1172         }
1173
1174         phy_attached_info(dev->net->phydev);
1175
1176         return 0;
1177
1178 unregister_mdio:
1179         mdiobus_unregister(pdata->mdiobus);
1180
1181 free_mdio:
1182         mdiobus_free(pdata->mdiobus);
1183
1184 free_pdata:
1185         kfree(pdata);
1186         return ret;
1187 }
1188
1189 static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1190 {
1191         struct smsc95xx_priv *pdata = dev->driver_priv;
1192
1193         phy_disconnect(dev->net->phydev);
1194         mdiobus_unregister(pdata->mdiobus);
1195         mdiobus_free(pdata->mdiobus);
1196         netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1197         kfree(pdata);
1198 }
1199
1200 static int smsc95xx_start_phy(struct usbnet *dev)
1201 {
1202         phy_start(dev->net->phydev);
1203
1204         return 0;
1205 }
1206
1207 static int smsc95xx_stop(struct usbnet *dev)
1208 {
1209         if (dev->net->phydev)
1210                 phy_stop(dev->net->phydev);
1211
1212         return 0;
1213 }
1214
1215 static u32 smsc_crc(const u8 *buffer, size_t len, int filter)
1216 {
1217         u32 crc = bitrev16(crc16(0xFFFF, buffer, len));
1218         return crc << ((filter % 2) * 16);
1219 }
1220
1221 static int smsc95xx_enable_phy_wakeup_interrupts(struct usbnet *dev, u16 mask)
1222 {
1223         int ret;
1224
1225         netdev_dbg(dev->net, "enabling PHY wakeup interrupts\n");
1226
1227         /* read to clear */
1228         ret = smsc95xx_mdio_read_nopm(dev, PHY_INT_SRC);
1229         if (ret < 0)
1230                 return ret;
1231
1232         /* enable interrupt source */
1233         ret = smsc95xx_mdio_read_nopm(dev, PHY_INT_MASK);
1234         if (ret < 0)
1235                 return ret;
1236
1237         ret |= mask;
1238
1239         smsc95xx_mdio_write_nopm(dev, PHY_INT_MASK, ret);
1240
1241         return 0;
1242 }
1243
1244 static int smsc95xx_link_ok_nopm(struct usbnet *dev)
1245 {
1246         int ret;
1247
1248         /* first, a dummy read, needed to latch some MII phys */
1249         ret = smsc95xx_mdio_read_nopm(dev, MII_BMSR);
1250         if (ret < 0)
1251                 return ret;
1252
1253         ret = smsc95xx_mdio_read_nopm(dev, MII_BMSR);
1254         if (ret < 0)
1255                 return ret;
1256
1257         return !!(ret & BMSR_LSTATUS);
1258 }
1259
1260 static int smsc95xx_enter_suspend0(struct usbnet *dev)
1261 {
1262         struct smsc95xx_priv *pdata = dev->driver_priv;
1263         u32 val;
1264         int ret;
1265
1266         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1267         if (ret < 0)
1268                 return ret;
1269
1270         val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
1271         val |= PM_CTL_SUS_MODE_0;
1272
1273         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1274         if (ret < 0)
1275                 return ret;
1276
1277         /* clear wol status */
1278         val &= ~PM_CTL_WUPS_;
1279         val |= PM_CTL_WUPS_WOL_;
1280
1281         /* enable energy detection */
1282         if (pdata->wolopts & WAKE_PHY)
1283                 val |= PM_CTL_WUPS_ED_;
1284
1285         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1286         if (ret < 0)
1287                 return ret;
1288
1289         /* read back PM_CTRL */
1290         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1291         if (ret < 0)
1292                 return ret;
1293
1294         pdata->suspend_flags |= SUSPEND_SUSPEND0;
1295
1296         return 0;
1297 }
1298
1299 static int smsc95xx_enter_suspend1(struct usbnet *dev)
1300 {
1301         struct smsc95xx_priv *pdata = dev->driver_priv;
1302         u32 val;
1303         int ret;
1304
1305         /* reconfigure link pulse detection timing for
1306          * compatibility with non-standard link partners
1307          */
1308         if (pdata->features & FEATURE_PHY_NLP_CROSSOVER)
1309                 smsc95xx_mdio_write_nopm(dev, PHY_EDPD_CONFIG,
1310                                          PHY_EDPD_CONFIG_DEFAULT);
1311
1312         /* enable energy detect power-down mode */
1313         ret = smsc95xx_mdio_read_nopm(dev, PHY_MODE_CTRL_STS);
1314         if (ret < 0)
1315                 return ret;
1316
1317         ret |= MODE_CTRL_STS_EDPWRDOWN_;
1318
1319         smsc95xx_mdio_write_nopm(dev, PHY_MODE_CTRL_STS, ret);
1320
1321         /* enter SUSPEND1 mode */
1322         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1323         if (ret < 0)
1324                 return ret;
1325
1326         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1327         val |= PM_CTL_SUS_MODE_1;
1328
1329         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1330         if (ret < 0)
1331                 return ret;
1332
1333         /* clear wol status, enable energy detection */
1334         val &= ~PM_CTL_WUPS_;
1335         val |= (PM_CTL_WUPS_ED_ | PM_CTL_ED_EN_);
1336
1337         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1338         if (ret < 0)
1339                 return ret;
1340
1341         pdata->suspend_flags |= SUSPEND_SUSPEND1;
1342
1343         return 0;
1344 }
1345
1346 static int smsc95xx_enter_suspend2(struct usbnet *dev)
1347 {
1348         struct smsc95xx_priv *pdata = dev->driver_priv;
1349         u32 val;
1350         int ret;
1351
1352         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1353         if (ret < 0)
1354                 return ret;
1355
1356         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1357         val |= PM_CTL_SUS_MODE_2;
1358
1359         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1360         if (ret < 0)
1361                 return ret;
1362
1363         pdata->suspend_flags |= SUSPEND_SUSPEND2;
1364
1365         return 0;
1366 }
1367
1368 static int smsc95xx_enter_suspend3(struct usbnet *dev)
1369 {
1370         struct smsc95xx_priv *pdata = dev->driver_priv;
1371         u32 val;
1372         int ret;
1373
1374         ret = smsc95xx_read_reg_nopm(dev, RX_FIFO_INF, &val);
1375         if (ret < 0)
1376                 return ret;
1377
1378         if (val & RX_FIFO_INF_USED_) {
1379                 netdev_info(dev->net, "rx fifo not empty in autosuspend\n");
1380                 return -EBUSY;
1381         }
1382
1383         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1384         if (ret < 0)
1385                 return ret;
1386
1387         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1388         val |= PM_CTL_SUS_MODE_3 | PM_CTL_RES_CLR_WKP_STS;
1389
1390         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1391         if (ret < 0)
1392                 return ret;
1393
1394         /* clear wol status */
1395         val &= ~PM_CTL_WUPS_;
1396         val |= PM_CTL_WUPS_WOL_;
1397
1398         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1399         if (ret < 0)
1400                 return ret;
1401
1402         pdata->suspend_flags |= SUSPEND_SUSPEND3;
1403
1404         return 0;
1405 }
1406
1407 static int smsc95xx_autosuspend(struct usbnet *dev, u32 link_up)
1408 {
1409         struct smsc95xx_priv *pdata = dev->driver_priv;
1410         int ret;
1411
1412         if (!netif_running(dev->net)) {
1413                 /* interface is ifconfig down so fully power down hw */
1414                 netdev_dbg(dev->net, "autosuspend entering SUSPEND2\n");
1415                 return smsc95xx_enter_suspend2(dev);
1416         }
1417
1418         if (!link_up) {
1419                 /* link is down so enter EDPD mode, but only if device can
1420                  * reliably resume from it.  This check should be redundant
1421                  * as current FEATURE_REMOTE_WAKEUP parts also support
1422                  * FEATURE_PHY_NLP_CROSSOVER but it's included for clarity */
1423                 if (!(pdata->features & FEATURE_PHY_NLP_CROSSOVER)) {
1424                         netdev_warn(dev->net, "EDPD not supported\n");
1425                         return -EBUSY;
1426                 }
1427
1428                 netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n");
1429
1430                 /* enable PHY wakeup events for if cable is attached */
1431                 ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1432                         PHY_INT_MASK_ANEG_COMP_);
1433                 if (ret < 0) {
1434                         netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1435                         return ret;
1436                 }
1437
1438                 netdev_info(dev->net, "entering SUSPEND1 mode\n");
1439                 return smsc95xx_enter_suspend1(dev);
1440         }
1441
1442         /* enable PHY wakeup events so we remote wakeup if cable is pulled */
1443         ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1444                 PHY_INT_MASK_LINK_DOWN_);
1445         if (ret < 0) {
1446                 netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1447                 return ret;
1448         }
1449
1450         netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n");
1451         return smsc95xx_enter_suspend3(dev);
1452 }
1453
1454 static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
1455 {
1456         struct usbnet *dev = usb_get_intfdata(intf);
1457         struct smsc95xx_priv *pdata = dev->driver_priv;
1458         u32 val, link_up;
1459         int ret;
1460
1461         ret = usbnet_suspend(intf, message);
1462         if (ret < 0) {
1463                 netdev_warn(dev->net, "usbnet_suspend error\n");
1464                 return ret;
1465         }
1466
1467         if (pdata->suspend_flags) {
1468                 netdev_warn(dev->net, "error during last resume\n");
1469                 pdata->suspend_flags = 0;
1470         }
1471
1472         /* determine if link is up using only _nopm functions */
1473         link_up = smsc95xx_link_ok_nopm(dev);
1474
1475         if (message.event == PM_EVENT_AUTO_SUSPEND &&
1476             (pdata->features & FEATURE_REMOTE_WAKEUP)) {
1477                 ret = smsc95xx_autosuspend(dev, link_up);
1478                 goto done;
1479         }
1480
1481         /* if we get this far we're not autosuspending */
1482         /* if no wol options set, or if link is down and we're not waking on
1483          * PHY activity, enter lowest power SUSPEND2 mode
1484          */
1485         if (!(pdata->wolopts & SUPPORTED_WAKE) ||
1486                 !(link_up || (pdata->wolopts & WAKE_PHY))) {
1487                 netdev_info(dev->net, "entering SUSPEND2 mode\n");
1488
1489                 /* disable energy detect (link up) & wake up events */
1490                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1491                 if (ret < 0)
1492                         goto done;
1493
1494                 val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
1495
1496                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1497                 if (ret < 0)
1498                         goto done;
1499
1500                 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1501                 if (ret < 0)
1502                         goto done;
1503
1504                 val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
1505
1506                 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1507                 if (ret < 0)
1508                         goto done;
1509
1510                 ret = smsc95xx_enter_suspend2(dev);
1511                 goto done;
1512         }
1513
1514         if (pdata->wolopts & WAKE_PHY) {
1515                 ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1516                         (PHY_INT_MASK_ANEG_COMP_ | PHY_INT_MASK_LINK_DOWN_));
1517                 if (ret < 0) {
1518                         netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1519                         goto done;
1520                 }
1521
1522                 /* if link is down then configure EDPD and enter SUSPEND1,
1523                  * otherwise enter SUSPEND0 below
1524                  */
1525                 if (!link_up) {
1526                         netdev_info(dev->net, "entering SUSPEND1 mode\n");
1527                         ret = smsc95xx_enter_suspend1(dev);
1528                         goto done;
1529                 }
1530         }
1531
1532         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1533                 u32 *filter_mask = kcalloc(32, sizeof(u32), GFP_KERNEL);
1534                 u32 command[2];
1535                 u32 offset[2];
1536                 u32 crc[4];
1537                 int wuff_filter_count =
1538                         (pdata->features & FEATURE_8_WAKEUP_FILTERS) ?
1539                         LAN9500A_WUFF_NUM : LAN9500_WUFF_NUM;
1540                 int i, filter = 0;
1541
1542                 if (!filter_mask) {
1543                         netdev_warn(dev->net, "Unable to allocate filter_mask\n");
1544                         ret = -ENOMEM;
1545                         goto done;
1546                 }
1547
1548                 memset(command, 0, sizeof(command));
1549                 memset(offset, 0, sizeof(offset));
1550                 memset(crc, 0, sizeof(crc));
1551
1552                 if (pdata->wolopts & WAKE_BCAST) {
1553                         const u8 bcast[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
1554                         netdev_info(dev->net, "enabling broadcast detection\n");
1555                         filter_mask[filter * 4] = 0x003F;
1556                         filter_mask[filter * 4 + 1] = 0x00;
1557                         filter_mask[filter * 4 + 2] = 0x00;
1558                         filter_mask[filter * 4 + 3] = 0x00;
1559                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1560                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1561                         crc[filter/2] |= smsc_crc(bcast, 6, filter);
1562                         filter++;
1563                 }
1564
1565                 if (pdata->wolopts & WAKE_MCAST) {
1566                         const u8 mcast[] = {0x01, 0x00, 0x5E};
1567                         netdev_info(dev->net, "enabling multicast detection\n");
1568                         filter_mask[filter * 4] = 0x0007;
1569                         filter_mask[filter * 4 + 1] = 0x00;
1570                         filter_mask[filter * 4 + 2] = 0x00;
1571                         filter_mask[filter * 4 + 3] = 0x00;
1572                         command[filter/4] |= 0x09UL << ((filter % 4) * 8);
1573                         offset[filter/4] |= 0x00  << ((filter % 4) * 8);
1574                         crc[filter/2] |= smsc_crc(mcast, 3, filter);
1575                         filter++;
1576                 }
1577
1578                 if (pdata->wolopts & WAKE_ARP) {
1579                         const u8 arp[] = {0x08, 0x06};
1580                         netdev_info(dev->net, "enabling ARP detection\n");
1581                         filter_mask[filter * 4] = 0x0003;
1582                         filter_mask[filter * 4 + 1] = 0x00;
1583                         filter_mask[filter * 4 + 2] = 0x00;
1584                         filter_mask[filter * 4 + 3] = 0x00;
1585                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1586                         offset[filter/4] |= 0x0C << ((filter % 4) * 8);
1587                         crc[filter/2] |= smsc_crc(arp, 2, filter);
1588                         filter++;
1589                 }
1590
1591                 if (pdata->wolopts & WAKE_UCAST) {
1592                         netdev_info(dev->net, "enabling unicast detection\n");
1593                         filter_mask[filter * 4] = 0x003F;
1594                         filter_mask[filter * 4 + 1] = 0x00;
1595                         filter_mask[filter * 4 + 2] = 0x00;
1596                         filter_mask[filter * 4 + 3] = 0x00;
1597                         command[filter/4] |= 0x01UL << ((filter % 4) * 8);
1598                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1599                         crc[filter/2] |= smsc_crc(dev->net->dev_addr, ETH_ALEN, filter);
1600                         filter++;
1601                 }
1602
1603                 for (i = 0; i < (wuff_filter_count * 4); i++) {
1604                         ret = smsc95xx_write_reg_nopm(dev, WUFF, filter_mask[i]);
1605                         if (ret < 0) {
1606                                 kfree(filter_mask);
1607                                 goto done;
1608                         }
1609                 }
1610                 kfree(filter_mask);
1611
1612                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1613                         ret = smsc95xx_write_reg_nopm(dev, WUFF, command[i]);
1614                         if (ret < 0)
1615                                 goto done;
1616                 }
1617
1618                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1619                         ret = smsc95xx_write_reg_nopm(dev, WUFF, offset[i]);
1620                         if (ret < 0)
1621                                 goto done;
1622                 }
1623
1624                 for (i = 0; i < (wuff_filter_count / 2); i++) {
1625                         ret = smsc95xx_write_reg_nopm(dev, WUFF, crc[i]);
1626                         if (ret < 0)
1627                                 goto done;
1628                 }
1629
1630                 /* clear any pending pattern match packet status */
1631                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1632                 if (ret < 0)
1633                         goto done;
1634
1635                 val |= WUCSR_WUFR_;
1636
1637                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1638                 if (ret < 0)
1639                         goto done;
1640         }
1641
1642         if (pdata->wolopts & WAKE_MAGIC) {
1643                 /* clear any pending magic packet status */
1644                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1645                 if (ret < 0)
1646                         goto done;
1647
1648                 val |= WUCSR_MPR_;
1649
1650                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1651                 if (ret < 0)
1652                         goto done;
1653         }
1654
1655         /* enable/disable wakeup sources */
1656         ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1657         if (ret < 0)
1658                 goto done;
1659
1660         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1661                 netdev_info(dev->net, "enabling pattern match wakeup\n");
1662                 val |= WUCSR_WAKE_EN_;
1663         } else {
1664                 netdev_info(dev->net, "disabling pattern match wakeup\n");
1665                 val &= ~WUCSR_WAKE_EN_;
1666         }
1667
1668         if (pdata->wolopts & WAKE_MAGIC) {
1669                 netdev_info(dev->net, "enabling magic packet wakeup\n");
1670                 val |= WUCSR_MPEN_;
1671         } else {
1672                 netdev_info(dev->net, "disabling magic packet wakeup\n");
1673                 val &= ~WUCSR_MPEN_;
1674         }
1675
1676         ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1677         if (ret < 0)
1678                 goto done;
1679
1680         /* enable wol wakeup source */
1681         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1682         if (ret < 0)
1683                 goto done;
1684
1685         val |= PM_CTL_WOL_EN_;
1686
1687         /* phy energy detect wakeup source */
1688         if (pdata->wolopts & WAKE_PHY)
1689                 val |= PM_CTL_ED_EN_;
1690
1691         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1692         if (ret < 0)
1693                 goto done;
1694
1695         /* enable receiver to enable frame reception */
1696         smsc95xx_start_rx_path(dev, 1);
1697
1698         /* some wol options are enabled, so enter SUSPEND0 */
1699         netdev_info(dev->net, "entering SUSPEND0 mode\n");
1700         ret = smsc95xx_enter_suspend0(dev);
1701
1702 done:
1703         /*
1704          * TODO: resume() might need to handle the suspend failure
1705          * in system sleep
1706          */
1707         if (ret && PMSG_IS_AUTO(message))
1708                 usbnet_resume(intf);
1709
1710         return ret;
1711 }
1712
1713 static int smsc95xx_resume(struct usb_interface *intf)
1714 {
1715         struct usbnet *dev = usb_get_intfdata(intf);
1716         struct smsc95xx_priv *pdata;
1717         u8 suspend_flags;
1718         int ret;
1719         u32 val;
1720
1721         BUG_ON(!dev);
1722         pdata = dev->driver_priv;
1723         suspend_flags = pdata->suspend_flags;
1724
1725         netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags);
1726
1727         /* do this first to ensure it's cleared even in error case */
1728         pdata->suspend_flags = 0;
1729
1730         if (suspend_flags & SUSPEND_ALLMODES) {
1731                 /* clear wake-up sources */
1732                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1733                 if (ret < 0)
1734                         return ret;
1735
1736                 val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
1737
1738                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1739                 if (ret < 0)
1740                         return ret;
1741
1742                 /* clear wake-up status */
1743                 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1744                 if (ret < 0)
1745                         return ret;
1746
1747                 val &= ~PM_CTL_WOL_EN_;
1748                 val |= PM_CTL_WUPS_;
1749
1750                 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1751                 if (ret < 0)
1752                         return ret;
1753         }
1754
1755         ret = usbnet_resume(intf);
1756         if (ret < 0)
1757                 netdev_warn(dev->net, "usbnet_resume error\n");
1758
1759         phy_init_hw(pdata->phydev);
1760         return ret;
1761 }
1762
1763 static int smsc95xx_reset_resume(struct usb_interface *intf)
1764 {
1765         struct usbnet *dev = usb_get_intfdata(intf);
1766         int ret;
1767
1768         ret = smsc95xx_reset(dev);
1769         if (ret < 0)
1770                 return ret;
1771
1772         return smsc95xx_resume(intf);
1773 }
1774
1775 static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1776 {
1777         skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
1778         skb->ip_summed = CHECKSUM_COMPLETE;
1779         skb_trim(skb, skb->len - 2);
1780 }
1781
1782 static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1783 {
1784         /* This check is no longer done by usbnet */
1785         if (skb->len < dev->net->hard_header_len)
1786                 return 0;
1787
1788         while (skb->len > 0) {
1789                 u32 header, align_count;
1790                 struct sk_buff *ax_skb;
1791                 unsigned char *packet;
1792                 u16 size;
1793
1794                 header = get_unaligned_le32(skb->data);
1795                 skb_pull(skb, 4 + NET_IP_ALIGN);
1796                 packet = skb->data;
1797
1798                 /* get the packet length */
1799                 size = (u16)((header & RX_STS_FL_) >> 16);
1800                 align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1801
1802                 if (unlikely(header & RX_STS_ES_)) {
1803                         netif_dbg(dev, rx_err, dev->net,
1804                                   "Error header=0x%08x\n", header);
1805                         dev->net->stats.rx_errors++;
1806                         dev->net->stats.rx_dropped++;
1807
1808                         if (header & RX_STS_CRC_) {
1809                                 dev->net->stats.rx_crc_errors++;
1810                         } else {
1811                                 if (header & (RX_STS_TL_ | RX_STS_RF_))
1812                                         dev->net->stats.rx_frame_errors++;
1813
1814                                 if ((header & RX_STS_LE_) &&
1815                                         (!(header & RX_STS_FT_)))
1816                                         dev->net->stats.rx_length_errors++;
1817                         }
1818                 } else {
1819                         /* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1820                         if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1821                                 netif_dbg(dev, rx_err, dev->net,
1822                                           "size err header=0x%08x\n", header);
1823                                 return 0;
1824                         }
1825
1826                         /* last frame in this batch */
1827                         if (skb->len == size) {
1828                                 if (dev->net->features & NETIF_F_RXCSUM)
1829                                         smsc95xx_rx_csum_offload(skb);
1830                                 skb_trim(skb, skb->len - 4); /* remove fcs */
1831                                 skb->truesize = size + sizeof(struct sk_buff);
1832
1833                                 return 1;
1834                         }
1835
1836                         ax_skb = skb_clone(skb, GFP_ATOMIC);
1837                         if (unlikely(!ax_skb)) {
1838                                 netdev_warn(dev->net, "Error allocating skb\n");
1839                                 return 0;
1840                         }
1841
1842                         ax_skb->len = size;
1843                         ax_skb->data = packet;
1844                         skb_set_tail_pointer(ax_skb, size);
1845
1846                         if (dev->net->features & NETIF_F_RXCSUM)
1847                                 smsc95xx_rx_csum_offload(ax_skb);
1848                         skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1849                         ax_skb->truesize = size + sizeof(struct sk_buff);
1850
1851                         usbnet_skb_return(dev, ax_skb);
1852                 }
1853
1854                 skb_pull(skb, size);
1855
1856                 /* padding bytes before the next frame starts */
1857                 if (skb->len)
1858                         skb_pull(skb, align_count);
1859         }
1860
1861         return 1;
1862 }
1863
1864 static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1865 {
1866         u16 low_16 = (u16)skb_checksum_start_offset(skb);
1867         u16 high_16 = low_16 + skb->csum_offset;
1868         return (high_16 << 16) | low_16;
1869 }
1870
1871 /* The TX CSUM won't work if the checksum lies in the last 4 bytes of the
1872  * transmission. This is fairly unlikely, only seems to trigger with some
1873  * short TCP ACK packets sent.
1874  *
1875  * Note, this calculation should probably check for the alignment of the
1876  * data as well, but a straight check for csum being in the last four bytes
1877  * of the packet should be ok for now.
1878  */
1879 static bool smsc95xx_can_tx_checksum(struct sk_buff *skb)
1880 {
1881        unsigned int len = skb->len - skb_checksum_start_offset(skb);
1882
1883        if (skb->len <= 45)
1884                return false;
1885        return skb->csum_offset < (len - (4 + 1));
1886 }
1887
1888 static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1889                                          struct sk_buff *skb, gfp_t flags)
1890 {
1891         bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
1892         int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
1893         u32 tx_cmd_a, tx_cmd_b;
1894         void *ptr;
1895
1896         /* We do not advertise SG, so skbs should be already linearized */
1897         BUG_ON(skb_shinfo(skb)->nr_frags);
1898
1899         /* Make writable and expand header space by overhead if required */
1900         if (skb_cow_head(skb, overhead)) {
1901                 /* Must deallocate here as returning NULL to indicate error
1902                  * means the skb won't be deallocated in the caller.
1903                  */
1904                 dev_kfree_skb_any(skb);
1905                 return NULL;
1906         }
1907
1908         tx_cmd_b = (u32)skb->len;
1909         tx_cmd_a = tx_cmd_b | TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
1910
1911         if (csum) {
1912                 if (!smsc95xx_can_tx_checksum(skb)) {
1913                         /* workaround - hardware tx checksum does not work
1914                          * properly with extremely small packets */
1915                         long csstart = skb_checksum_start_offset(skb);
1916                         __wsum calc = csum_partial(skb->data + csstart,
1917                                 skb->len - csstart, 0);
1918                         *((__sum16 *)(skb->data + csstart
1919                                 + skb->csum_offset)) = csum_fold(calc);
1920
1921                         csum = false;
1922                 } else {
1923                         u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
1924                         ptr = skb_push(skb, 4);
1925                         put_unaligned_le32(csum_preamble, ptr);
1926
1927                         tx_cmd_a += 4;
1928                         tx_cmd_b += 4;
1929                         tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
1930                 }
1931         }
1932
1933         ptr = skb_push(skb, 8);
1934         put_unaligned_le32(tx_cmd_a, ptr);
1935         put_unaligned_le32(tx_cmd_b, ptr+4);
1936
1937         return skb;
1938 }
1939
1940 static int smsc95xx_manage_power(struct usbnet *dev, int on)
1941 {
1942         struct smsc95xx_priv *pdata = dev->driver_priv;
1943
1944         dev->intf->needs_remote_wakeup = on;
1945
1946         if (pdata->features & FEATURE_REMOTE_WAKEUP)
1947                 return 0;
1948
1949         /* this chip revision isn't capable of remote wakeup */
1950         netdev_info(dev->net, "hardware isn't capable of remote wakeup\n");
1951
1952         if (on)
1953                 usb_autopm_get_interface_no_resume(dev->intf);
1954         else
1955                 usb_autopm_put_interface(dev->intf);
1956
1957         return 0;
1958 }
1959
1960 static const struct driver_info smsc95xx_info = {
1961         .description    = "smsc95xx USB 2.0 Ethernet",
1962         .bind           = smsc95xx_bind,
1963         .unbind         = smsc95xx_unbind,
1964         .link_reset     = smsc95xx_link_reset,
1965         .reset          = smsc95xx_start_phy,
1966         .stop           = smsc95xx_stop,
1967         .rx_fixup       = smsc95xx_rx_fixup,
1968         .tx_fixup       = smsc95xx_tx_fixup,
1969         .status         = smsc95xx_status,
1970         .manage_power   = smsc95xx_manage_power,
1971         .flags          = FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
1972 };
1973
1974 static const struct usb_device_id products[] = {
1975         {
1976                 /* SMSC9500 USB Ethernet Device */
1977                 USB_DEVICE(0x0424, 0x9500),
1978                 .driver_info = (unsigned long) &smsc95xx_info,
1979         },
1980         {
1981                 /* SMSC9505 USB Ethernet Device */
1982                 USB_DEVICE(0x0424, 0x9505),
1983                 .driver_info = (unsigned long) &smsc95xx_info,
1984         },
1985         {
1986                 /* SMSC9500A USB Ethernet Device */
1987                 USB_DEVICE(0x0424, 0x9E00),
1988                 .driver_info = (unsigned long) &smsc95xx_info,
1989         },
1990         {
1991                 /* SMSC9505A USB Ethernet Device */
1992                 USB_DEVICE(0x0424, 0x9E01),
1993                 .driver_info = (unsigned long) &smsc95xx_info,
1994         },
1995         {
1996                 /* SMSC9512/9514 USB Hub & Ethernet Device */
1997                 USB_DEVICE(0x0424, 0xec00),
1998                 .driver_info = (unsigned long) &smsc95xx_info,
1999         },
2000         {
2001                 /* SMSC9500 USB Ethernet Device (SAL10) */
2002                 USB_DEVICE(0x0424, 0x9900),
2003                 .driver_info = (unsigned long) &smsc95xx_info,
2004         },
2005         {
2006                 /* SMSC9505 USB Ethernet Device (SAL10) */
2007                 USB_DEVICE(0x0424, 0x9901),
2008                 .driver_info = (unsigned long) &smsc95xx_info,
2009         },
2010         {
2011                 /* SMSC9500A USB Ethernet Device (SAL10) */
2012                 USB_DEVICE(0x0424, 0x9902),
2013                 .driver_info = (unsigned long) &smsc95xx_info,
2014         },
2015         {
2016                 /* SMSC9505A USB Ethernet Device (SAL10) */
2017                 USB_DEVICE(0x0424, 0x9903),
2018                 .driver_info = (unsigned long) &smsc95xx_info,
2019         },
2020         {
2021                 /* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
2022                 USB_DEVICE(0x0424, 0x9904),
2023                 .driver_info = (unsigned long) &smsc95xx_info,
2024         },
2025         {
2026                 /* SMSC9500A USB Ethernet Device (HAL) */
2027                 USB_DEVICE(0x0424, 0x9905),
2028                 .driver_info = (unsigned long) &smsc95xx_info,
2029         },
2030         {
2031                 /* SMSC9505A USB Ethernet Device (HAL) */
2032                 USB_DEVICE(0x0424, 0x9906),
2033                 .driver_info = (unsigned long) &smsc95xx_info,
2034         },
2035         {
2036                 /* SMSC9500 USB Ethernet Device (Alternate ID) */
2037                 USB_DEVICE(0x0424, 0x9907),
2038                 .driver_info = (unsigned long) &smsc95xx_info,
2039         },
2040         {
2041                 /* SMSC9500A USB Ethernet Device (Alternate ID) */
2042                 USB_DEVICE(0x0424, 0x9908),
2043                 .driver_info = (unsigned long) &smsc95xx_info,
2044         },
2045         {
2046                 /* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
2047                 USB_DEVICE(0x0424, 0x9909),
2048                 .driver_info = (unsigned long) &smsc95xx_info,
2049         },
2050         {
2051                 /* SMSC LAN9530 USB Ethernet Device */
2052                 USB_DEVICE(0x0424, 0x9530),
2053                 .driver_info = (unsigned long) &smsc95xx_info,
2054         },
2055         {
2056                 /* SMSC LAN9730 USB Ethernet Device */
2057                 USB_DEVICE(0x0424, 0x9730),
2058                 .driver_info = (unsigned long) &smsc95xx_info,
2059         },
2060         {
2061                 /* SMSC LAN89530 USB Ethernet Device */
2062                 USB_DEVICE(0x0424, 0x9E08),
2063                 .driver_info = (unsigned long) &smsc95xx_info,
2064         },
2065         { },            /* END */
2066 };
2067 MODULE_DEVICE_TABLE(usb, products);
2068
2069 static struct usb_driver smsc95xx_driver = {
2070         .name           = "smsc95xx",
2071         .id_table       = products,
2072         .probe          = usbnet_probe,
2073         .suspend        = smsc95xx_suspend,
2074         .resume         = smsc95xx_resume,
2075         .reset_resume   = smsc95xx_reset_resume,
2076         .disconnect     = usbnet_disconnect,
2077         .disable_hub_initiated_lpm = 1,
2078         .supports_autosuspend = 1,
2079 };
2080
2081 module_usb_driver(smsc95xx_driver);
2082
2083 MODULE_AUTHOR("Nancy Lin");
2084 MODULE_AUTHOR("Steve Glendinning <[email protected]>");
2085 MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
2086 MODULE_LICENSE("GPL");