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/irq.h>
  22 #include <linux/irqdomain.h>
  23 #include <linux/mdio.h>
  24 #include <linux/phy.h>
  25 #include <net/selftests.h>
  26
  27 #include "smsc95xx.h"
  28
  29 #define SMSC_CHIPNAME                   "smsc95xx"
  30 #define SMSC_DRIVER_VERSION             "2.0.0"
  31 #define HS_USB_PKT_SIZE                 (512)
  32 #define FS_USB_PKT_SIZE                 (64)
  33 #define DEFAULT_HS_BURST_CAP_SIZE       (16 * 1024 + 5 * HS_USB_PKT_SIZE)
  34 #define DEFAULT_FS_BURST_CAP_SIZE       (6 * 1024 + 33 * FS_USB_PKT_SIZE)
  35 #define DEFAULT_BULK_IN_DELAY           (0x00002000)
  36 #define MAX_SINGLE_PACKET_SIZE          (2048)
  37 #define LAN95XX_EEPROM_MAGIC            (0x9500)
  38 #define EEPROM_MAC_OFFSET               (0x01)
  39 #define DEFAULT_TX_CSUM_ENABLE          (true)
  40 #define DEFAULT_RX_CSUM_ENABLE          (true)
  41 #define SMSC95XX_INTERNAL_PHY_ID        (1)
  42 #define SMSC95XX_TX_OVERHEAD            (8)
  43 #define SMSC95XX_TX_OVERHEAD_CSUM       (12)
  44 #define SUPPORTED_WAKE                  (WAKE_PHY | WAKE_UCAST | WAKE_BCAST | \
  45                                          WAKE_MCAST | WAKE_ARP | WAKE_MAGIC)
  46
  47 #define FEATURE_8_WAKEUP_FILTERS        (0x01)
  48 #define FEATURE_PHY_NLP_CROSSOVER       (0x02)
  49 #define FEATURE_REMOTE_WAKEUP           (0x04)
  50
  51 #define SUSPEND_SUSPEND0                (0x01)
  52 #define SUSPEND_SUSPEND1                (0x02)
  53 #define SUSPEND_SUSPEND2                (0x04)
  54 #define SUSPEND_SUSPEND3                (0x08)
  55 #define SUSPEND_ALLMODES                (SUSPEND_SUSPEND0 | SUSPEND_SUSPEND1 | \
  56                                          SUSPEND_SUSPEND2 | SUSPEND_SUSPEND3)
  57
  58 #define SMSC95XX_NR_IRQS                (1) /* raise to 12 for GPIOs */
  59 #define PHY_HWIRQ                       (SMSC95XX_NR_IRQS - 1)
  60
  61 struct smsc95xx_priv {
  62         u32 mac_cr;
  63         u32 hash_hi;
  64         u32 hash_lo;
  65         u32 wolopts;
  66         spinlock_t mac_cr_lock;
  67         u8 features;
  68         u8 suspend_flags;
  69         bool is_internal_phy;
  70         struct irq_chip irqchip;
  71         struct irq_domain *irqdomain;
  72         struct fwnode_handle *irqfwnode;
  73         struct mii_bus *mdiobus;
  74         struct phy_device *phydev;
  75         struct task_struct *pm_task;
  76 };
  77
  78 static bool turbo_mode = true;
  79 module_param(turbo_mode, bool, 0644);
  80 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
  81
  82 static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
  83                                           u32 *data)
  84 {
  85         struct smsc95xx_priv *pdata = dev->driver_priv;
  86         u32 buf;
  87         int ret;
  88         int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
  89
  90         if (current != pdata->pm_task)
  91                 fn = usbnet_read_cmd;
  92         else
  93                 fn = usbnet_read_cmd_nopm;
  94
  95         ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
  96                  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  97                  0, index, &buf, 4);
  98         if (ret < 0) {
  99                 if (ret != -ENODEV)
 100                         netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d\n",
 101                                     index, ret);
 102                 return ret;
 103         }
 104
 105         le32_to_cpus(&buf);
 106         *data = buf;
 107
 108         return ret;
 109 }
 110
 111 static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
 112                                            u32 data)
 113 {
 114         struct smsc95xx_priv *pdata = dev->driver_priv;
 115         u32 buf;
 116         int ret;
 117         int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
 118
 119         if (current != pdata->pm_task)
 120                 fn = usbnet_write_cmd;
 121         else
 122                 fn = usbnet_write_cmd_nopm;
 123
 124         buf = data;
 125         cpu_to_le32s(&buf);
 126
 127         ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
 128                  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 129                  0, index, &buf, 4);
 130         if (ret < 0 && ret != -ENODEV)
 131                 netdev_warn(dev->net, "Failed to write reg index 0x%08x: %d\n",
 132                             index, ret);
 133
 134         return ret;
 135 }
 136
 137 /* Loop until the read is completed with timeout
 138  * called with phy_mutex held */
 139 static int __must_check smsc95xx_phy_wait_not_busy(struct usbnet *dev)
 140 {
 141         unsigned long start_time = jiffies;
 142         u32 val;
 143         int ret;
 144
 145         do {
 146                 ret = smsc95xx_read_reg(dev, MII_ADDR, &val);
 147                 if (ret < 0) {
 148                         /* Ignore -ENODEV error during disconnect() */
 149                         if (ret == -ENODEV)
 150                                 return 0;
 151                         netdev_warn(dev->net, "Error reading MII_ACCESS\n");
 152                         return ret;
 153                 }
 154
 155                 if (!(val & MII_BUSY_))
 156                         return 0;
 157         } while (!time_after(jiffies, start_time + HZ));
 158
 159         return -EIO;
 160 }
 161
 162 static u32 mii_address_cmd(int phy_id, int idx, u16 op)
 163 {
 164         return (phy_id & 0x1f) << 11 | (idx & 0x1f) << 6 | op;
 165 }
 166
 167 static int smsc95xx_mdio_read(struct usbnet *dev, int phy_id, int idx)
 168 {
 169         u32 val, addr;
 170         int ret;
 171
 172         mutex_lock(&dev->phy_mutex);
 173
 174         /* confirm MII not busy */
 175         ret = smsc95xx_phy_wait_not_busy(dev);
 176         if (ret < 0) {
 177                 netdev_warn(dev->net, "%s: MII is busy\n", __func__);
 178                 goto done;
 179         }
 180
 181         /* set the address, index & direction (read from PHY) */
 182         addr = mii_address_cmd(phy_id, idx, MII_READ_ | MII_BUSY_);
 183         ret = smsc95xx_write_reg(dev, MII_ADDR, addr);
 184         if (ret < 0) {
 185                 if (ret != -ENODEV)
 186                         netdev_warn(dev->net, "Error writing MII_ADDR\n");
 187                 goto done;
 188         }
 189
 190         ret = smsc95xx_phy_wait_not_busy(dev);
 191         if (ret < 0) {
 192                 netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
 193                 goto done;
 194         }
 195
 196         ret = smsc95xx_read_reg(dev, MII_DATA, &val);
 197         if (ret < 0) {
 198                 if (ret != -ENODEV)
 199                         netdev_warn(dev->net, "Error reading MII_DATA\n");
 200                 goto done;
 201         }
 202
 203         ret = (u16)(val & 0xFFFF);
 204
 205 done:
 206         mutex_unlock(&dev->phy_mutex);
 207
 208         /* Ignore -ENODEV error during disconnect() */
 209         if (ret == -ENODEV)
 210                 return 0;
 211         return ret;
 212 }
 213
 214 static void smsc95xx_mdio_write(struct usbnet *dev, int phy_id, int idx,
 215                                 int regval)
 216 {
 217         u32 val, addr;
 218         int ret;
 219
 220         mutex_lock(&dev->phy_mutex);
 221
 222         /* confirm MII not busy */
 223         ret = smsc95xx_phy_wait_not_busy(dev);
 224         if (ret < 0) {
 225                 netdev_warn(dev->net, "%s: MII is busy\n", __func__);
 226                 goto done;
 227         }
 228
 229         val = regval;
 230         ret = smsc95xx_write_reg(dev, MII_DATA, val);
 231         if (ret < 0) {
 232                 if (ret != -ENODEV)
 233                         netdev_warn(dev->net, "Error writing MII_DATA\n");
 234                 goto done;
 235         }
 236
 237         /* set the address, index & direction (write to PHY) */
 238         addr = mii_address_cmd(phy_id, idx, MII_WRITE_ | MII_BUSY_);
 239         ret = smsc95xx_write_reg(dev, MII_ADDR, addr);
 240         if (ret < 0) {
 241                 if (ret != -ENODEV)
 242                         netdev_warn(dev->net, "Error writing MII_ADDR\n");
 243                 goto done;
 244         }
 245
 246         ret = smsc95xx_phy_wait_not_busy(dev);
 247         if (ret < 0) {
 248                 netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
 249                 goto done;
 250         }
 251
 252 done:
 253         mutex_unlock(&dev->phy_mutex);
 254 }
 255
 256 static int smsc95xx_mdiobus_reset(struct mii_bus *bus)
 257 {
 258         struct smsc95xx_priv *pdata;
 259         struct usbnet *dev;
 260         u32 val;
 261         int ret;
 262
 263         dev = bus->priv;
 264         pdata = dev->driver_priv;
 265
 266         if (pdata->is_internal_phy)
 267                 return 0;
 268
 269         mutex_lock(&dev->phy_mutex);
 270
 271         ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
 272         if (ret < 0)
 273                 goto reset_out;
 274
 275         val |= PM_CTL_PHY_RST_;
 276
 277         ret = smsc95xx_write_reg(dev, PM_CTRL, val);
 278         if (ret < 0)
 279                 goto reset_out;
 280
 281         /* Driver has no knowledge at this point about the external PHY.
 282          * The 802.3 specifies that the reset process shall
 283          * be completed within 0.5 s.
 284          */
 285         fsleep(500000);
 286
 287 reset_out:
 288         mutex_unlock(&dev->phy_mutex);
 289
 290         return 0;
 291 }
 292
 293 static int smsc95xx_mdiobus_read(struct mii_bus *bus, int phy_id, int idx)
 294 {
 295         struct usbnet *dev = bus->priv;
 296
 297         return smsc95xx_mdio_read(dev, phy_id, idx);
 298 }
 299
 300 static int smsc95xx_mdiobus_write(struct mii_bus *bus, int phy_id, int idx,
 301                                   u16 regval)
 302 {
 303         struct usbnet *dev = bus->priv;
 304
 305         smsc95xx_mdio_write(dev, phy_id, idx, regval);
 306         return 0;
 307 }
 308
 309 static int __must_check smsc95xx_wait_eeprom(struct usbnet *dev)
 310 {
 311         unsigned long start_time = jiffies;
 312         u32 val;
 313         int ret;
 314
 315         do {
 316                 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
 317                 if (ret < 0) {
 318                         netdev_warn(dev->net, "Error reading E2P_CMD\n");
 319                         return ret;
 320                 }
 321
 322                 if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
 323                         break;
 324                 udelay(40);
 325         } while (!time_after(jiffies, start_time + HZ));
 326
 327         if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
 328                 netdev_warn(dev->net, "EEPROM read operation timeout\n");
 329                 return -EIO;
 330         }
 331
 332         return 0;
 333 }
 334
 335 static int __must_check smsc95xx_eeprom_confirm_not_busy(struct usbnet *dev)
 336 {
 337         unsigned long start_time = jiffies;
 338         u32 val;
 339         int ret;
 340
 341         do {
 342                 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
 343                 if (ret < 0) {
 344                         netdev_warn(dev->net, "Error reading E2P_CMD\n");
 345                         return ret;
 346                 }
 347
 348                 if (!(val & E2P_CMD_BUSY_))
 349                         return 0;
 350
 351                 udelay(40);
 352         } while (!time_after(jiffies, start_time + HZ));
 353
 354         netdev_warn(dev->net, "EEPROM is busy\n");
 355         return -EIO;
 356 }
 357
 358 static int smsc95xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
 359                                 u8 *data)
 360 {
 361         u32 val;
 362         int i, ret;
 363
 364         BUG_ON(!dev);
 365         BUG_ON(!data);
 366
 367         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 368         if (ret)
 369                 return ret;
 370
 371         for (i = 0; i < length; i++) {
 372                 val = E2P_CMD_BUSY_ | E2P_CMD_READ_ | (offset & E2P_CMD_ADDR_);
 373                 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 374                 if (ret < 0) {
 375                         netdev_warn(dev->net, "Error writing E2P_CMD\n");
 376                         return ret;
 377                 }
 378
 379                 ret = smsc95xx_wait_eeprom(dev);
 380                 if (ret < 0)
 381                         return ret;
 382
 383                 ret = smsc95xx_read_reg(dev, E2P_DATA, &val);
 384                 if (ret < 0) {
 385                         netdev_warn(dev->net, "Error reading E2P_DATA\n");
 386                         return ret;
 387                 }
 388
 389                 data[i] = val & 0xFF;
 390                 offset++;
 391         }
 392
 393         return 0;
 394 }
 395
 396 static int smsc95xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
 397                                  u8 *data)
 398 {
 399         u32 val;
 400         int i, ret;
 401
 402         BUG_ON(!dev);
 403         BUG_ON(!data);
 404
 405         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 406         if (ret)
 407                 return ret;
 408
 409         /* Issue write/erase enable command */
 410         val = E2P_CMD_BUSY_ | E2P_CMD_EWEN_;
 411         ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 412         if (ret < 0) {
 413                 netdev_warn(dev->net, "Error writing E2P_DATA\n");
 414                 return ret;
 415         }
 416
 417         ret = smsc95xx_wait_eeprom(dev);
 418         if (ret < 0)
 419                 return ret;
 420
 421         for (i = 0; i < length; i++) {
 422
 423                 /* Fill data register */
 424                 val = data[i];
 425                 ret = smsc95xx_write_reg(dev, E2P_DATA, val);
 426                 if (ret < 0) {
 427                         netdev_warn(dev->net, "Error writing E2P_DATA\n");
 428                         return ret;
 429                 }
 430
 431                 /* Send "write" command */
 432                 val = E2P_CMD_BUSY_ | E2P_CMD_WRITE_ | (offset & E2P_CMD_ADDR_);
 433                 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 434                 if (ret < 0) {
 435                         netdev_warn(dev->net, "Error writing E2P_CMD\n");
 436                         return ret;
 437                 }
 438
 439                 ret = smsc95xx_wait_eeprom(dev);
 440                 if (ret < 0)
 441                         return ret;
 442
 443                 offset++;
 444         }
 445
 446         return 0;
 447 }
 448
 449 static int __must_check smsc95xx_write_reg_async(struct usbnet *dev, u16 index,
 450                                                  u32 data)
 451 {
 452         const u16 size = 4;
 453         u32 buf;
 454         int ret;
 455
 456         buf = data;
 457         cpu_to_le32s(&buf);
 458
 459         ret = usbnet_write_cmd_async(dev, USB_VENDOR_REQUEST_WRITE_REGISTER,
 460                                      USB_DIR_OUT | USB_TYPE_VENDOR |
 461                                      USB_RECIP_DEVICE,
 462                                      0, index, &buf, size);
 463         if (ret < 0)
 464                 netdev_warn(dev->net, "Error write async cmd, sts=%d\n",
 465                             ret);
 466         return ret;
 467 }
 468
 469 /* returns hash bit number for given MAC address
 470  * example:
 471  * 01 00 5E 00 00 01 -> returns bit number 31 */
 472 static unsigned int smsc95xx_hash(char addr[ETH_ALEN])
 473 {
 474         return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
 475 }
 476
 477 static void smsc95xx_set_multicast(struct net_device *netdev)
 478 {
 479         struct usbnet *dev = netdev_priv(netdev);
 480         struct smsc95xx_priv *pdata = dev->driver_priv;
 481         unsigned long flags;
 482         int ret;
 483
 484         pdata->hash_hi = 0;
 485         pdata->hash_lo = 0;
 486
 487         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 488
 489         if (dev->net->flags & IFF_PROMISC) {
 490                 netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
 491                 pdata->mac_cr |= MAC_CR_PRMS_;
 492                 pdata->mac_cr &= ~(MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 493         } else if (dev->net->flags & IFF_ALLMULTI) {
 494                 netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
 495                 pdata->mac_cr |= MAC_CR_MCPAS_;
 496                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_HPFILT_);
 497         } else if (!netdev_mc_empty(dev->net)) {
 498                 struct netdev_hw_addr *ha;
 499
 500                 pdata->mac_cr |= MAC_CR_HPFILT_;
 501                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);
 502
 503                 netdev_for_each_mc_addr(ha, netdev) {
 504                         u32 bitnum = smsc95xx_hash(ha->addr);
 505                         u32 mask = 0x01 << (bitnum & 0x1F);
 506                         if (bitnum & 0x20)
 507                                 pdata->hash_hi |= mask;
 508                         else
 509                                 pdata->hash_lo |= mask;
 510                 }
 511
 512                 netif_dbg(dev, drv, dev->net, "HASHH=0x%08X, HASHL=0x%08X\n",
 513                                    pdata->hash_hi, pdata->hash_lo);
 514         } else {
 515                 netif_dbg(dev, drv, dev->net, "receive own packets only\n");
 516                 pdata->mac_cr &=
 517                         ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 518         }
 519
 520         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 521
 522         /* Initiate async writes, as we can't wait for completion here */
 523         ret = smsc95xx_write_reg_async(dev, HASHH, pdata->hash_hi);
 524         if (ret < 0)
 525                 netdev_warn(dev->net, "failed to initiate async write to HASHH\n");
 526
 527         ret = smsc95xx_write_reg_async(dev, HASHL, pdata->hash_lo);
 528         if (ret < 0)
 529                 netdev_warn(dev->net, "failed to initiate async write to HASHL\n");
 530
 531         ret = smsc95xx_write_reg_async(dev, MAC_CR, pdata->mac_cr);
 532         if (ret < 0)
 533                 netdev_warn(dev->net, "failed to initiate async write to MAC_CR\n");
 534 }
 535
 536 static int smsc95xx_phy_update_flowcontrol(struct usbnet *dev)
 537 {
 538         u32 flow = 0, afc_cfg;
 539         struct smsc95xx_priv *pdata = dev->driver_priv;
 540         bool tx_pause, rx_pause;
 541
 542         int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
 543         if (ret < 0)
 544                 return ret;
 545
 546         if (pdata->phydev->duplex == DUPLEX_FULL) {
 547                 phy_get_pause(pdata->phydev, &tx_pause, &rx_pause);
 548
 549                 if (rx_pause)
 550                         flow = 0xFFFF0002;
 551
 552                 if (tx_pause) {
 553                         afc_cfg |= 0xF;
 554                         flow |= 0xFFFF0000;
 555                 } else {
 556                         afc_cfg &= ~0xF;
 557                 }
 558
 559                 netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
 560                           rx_pause ? "enabled" : "disabled",
 561                           tx_pause ? "enabled" : "disabled");
 562         } else {
 563                 netif_dbg(dev, link, dev->net, "half duplex\n");
 564                 afc_cfg |= 0xF;
 565         }
 566
 567         ret = smsc95xx_write_reg(dev, FLOW, flow);
 568         if (ret < 0)
 569                 return ret;
 570
 571         return smsc95xx_write_reg(dev, AFC_CFG, afc_cfg);
 572 }
 573
 574 static void smsc95xx_mac_update_fullduplex(struct usbnet *dev)
 575 {
 576         struct smsc95xx_priv *pdata = dev->driver_priv;
 577         unsigned long flags;
 578         int ret;
 579
 580         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 581         if (pdata->phydev->duplex != DUPLEX_FULL) {
 582                 pdata->mac_cr &= ~MAC_CR_FDPX_;
 583                 pdata->mac_cr |= MAC_CR_RCVOWN_;
 584         } else {
 585                 pdata->mac_cr &= ~MAC_CR_RCVOWN_;
 586                 pdata->mac_cr |= MAC_CR_FDPX_;
 587         }
 588         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 589
 590         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 591         if (ret < 0) {
 592                 if (ret != -ENODEV)
 593                         netdev_warn(dev->net,
 594                                     "Error updating MAC full duplex mode\n");
 595                 return;
 596         }
 597
 598         ret = smsc95xx_phy_update_flowcontrol(dev);
 599         if (ret < 0)
 600                 netdev_warn(dev->net, "Error updating PHY flow control\n");
 601 }
 602
 603 static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
 604 {
 605         struct smsc95xx_priv *pdata = dev->driver_priv;
 606         unsigned long flags;
 607         u32 intdata;
 608
 609         if (urb->actual_length != 4) {
 610                 netdev_warn(dev->net, "unexpected urb length %d\n",
 611                             urb->actual_length);
 612                 return;
 613         }
 614
 615         intdata = get_unaligned_le32(urb->transfer_buffer);
 616         netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
 617
 618         local_irq_save(flags);
 619
 620         if (intdata & INT_ENP_PHY_INT_)
 621                 generic_handle_domain_irq(pdata->irqdomain, PHY_HWIRQ);
 622         else
 623                 netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
 624                             intdata);
 625
 626         local_irq_restore(flags);
 627 }
 628
 629 /* Enable or disable Tx & Rx checksum offload engines */
 630 static int smsc95xx_set_features(struct net_device *netdev,
 631         netdev_features_t features)
 632 {
 633         struct usbnet *dev = netdev_priv(netdev);
 634         u32 read_buf;
 635         int ret;
 636
 637         ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
 638         if (ret < 0)
 639                 return ret;
 640
 641         if (features & NETIF_F_IP_CSUM)
 642                 read_buf |= Tx_COE_EN_;
 643         else
 644                 read_buf &= ~Tx_COE_EN_;
 645
 646         if (features & NETIF_F_RXCSUM)
 647                 read_buf |= Rx_COE_EN_;
 648         else
 649                 read_buf &= ~Rx_COE_EN_;
 650
 651         ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
 652         if (ret < 0)
 653                 return ret;
 654
 655         netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
 656         return 0;
 657 }
 658
 659 static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
 660 {
 661         return MAX_EEPROM_SIZE;
 662 }
 663
 664 static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
 665                                        struct ethtool_eeprom *ee, u8 *data)
 666 {
 667         struct usbnet *dev = netdev_priv(netdev);
 668
 669         ee->magic = LAN95XX_EEPROM_MAGIC;
 670
 671         return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
 672 }
 673
 674 static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
 675                                        struct ethtool_eeprom *ee, u8 *data)
 676 {
 677         struct usbnet *dev = netdev_priv(netdev);
 678
 679         if (ee->magic != LAN95XX_EEPROM_MAGIC) {
 680                 netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
 681                             ee->magic);
 682                 return -EINVAL;
 683         }
 684
 685         return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
 686 }
 687
 688 static int smsc95xx_ethtool_getregslen(struct net_device *netdev)
 689 {
 690         /* all smsc95xx registers */
 691         return COE_CR - ID_REV + sizeof(u32);
 692 }
 693
 694 static void
 695 smsc95xx_ethtool_getregs(struct net_device *netdev, struct ethtool_regs *regs,
 696                          void *buf)
 697 {
 698         struct usbnet *dev = netdev_priv(netdev);
 699         unsigned int i, j;
 700         int retval;
 701         u32 *data = buf;
 702
 703         retval = smsc95xx_read_reg(dev, ID_REV, &regs->version);
 704         if (retval < 0) {
 705                 netdev_warn(netdev, "REGS: cannot read ID_REV\n");
 706                 return;
 707         }
 708
 709         for (i = ID_REV, j = 0; i <= COE_CR; i += (sizeof(u32)), j++) {
 710                 retval = smsc95xx_read_reg(dev, i, &data[j]);
 711                 if (retval < 0) {
 712                         netdev_warn(netdev, "REGS: cannot read reg[%x]\n", i);
 713                         return;
 714                 }
 715         }
 716 }
 717
 718 static void smsc95xx_ethtool_get_wol(struct net_device *net,
 719                                      struct ethtool_wolinfo *wolinfo)
 720 {
 721         struct usbnet *dev = netdev_priv(net);
 722         struct smsc95xx_priv *pdata = dev->driver_priv;
 723
 724         wolinfo->supported = SUPPORTED_WAKE;
 725         wolinfo->wolopts = pdata->wolopts;
 726 }
 727
 728 static int smsc95xx_ethtool_set_wol(struct net_device *net,
 729                                     struct ethtool_wolinfo *wolinfo)
 730 {
 731         struct usbnet *dev = netdev_priv(net);
 732         struct smsc95xx_priv *pdata = dev->driver_priv;
 733         int ret;
 734
 735         if (wolinfo->wolopts & ~SUPPORTED_WAKE)
 736                 return -EINVAL;
 737
 738         pdata->wolopts = wolinfo->wolopts & SUPPORTED_WAKE;
 739
 740         ret = device_set_wakeup_enable(&dev->udev->dev, pdata->wolopts);
 741         if (ret < 0)
 742                 netdev_warn(dev->net, "device_set_wakeup_enable error %d\n", ret);
 743
 744         return ret;
 745 }
 746
 747 static u32 smsc95xx_get_link(struct net_device *net)
 748 {
 749         phy_read_status(net->phydev);
 750         return net->phydev->link;
 751 }
 752
 753 static void smsc95xx_ethtool_get_strings(struct net_device *netdev, u32 sset,
 754                                         u8 *data)
 755 {
 756         switch (sset) {
 757         case ETH_SS_TEST:
 758                 net_selftest_get_strings(data);
 759                 break;
 760         }
 761 }
 762
 763 static int smsc95xx_ethtool_get_sset_count(struct net_device *ndev, int sset)
 764 {
 765         switch (sset) {
 766         case ETH_SS_TEST:
 767                 return net_selftest_get_count();
 768         default:
 769                 return -EOPNOTSUPP;
 770         }
 771 }
 772
 773 static const struct ethtool_ops smsc95xx_ethtool_ops = {
 774         .get_link       = smsc95xx_get_link,
 775         .nway_reset     = phy_ethtool_nway_reset,
 776         .get_drvinfo    = usbnet_get_drvinfo,
 777         .get_msglevel   = usbnet_get_msglevel,
 778         .set_msglevel   = usbnet_set_msglevel,
 779         .get_eeprom_len = smsc95xx_ethtool_get_eeprom_len,
 780         .get_eeprom     = smsc95xx_ethtool_get_eeprom,
 781         .set_eeprom     = smsc95xx_ethtool_set_eeprom,
 782         .get_regs_len   = smsc95xx_ethtool_getregslen,
 783         .get_regs       = smsc95xx_ethtool_getregs,
 784         .get_wol        = smsc95xx_ethtool_get_wol,
 785         .set_wol        = smsc95xx_ethtool_set_wol,
 786         .get_link_ksettings     = phy_ethtool_get_link_ksettings,
 787         .set_link_ksettings     = phy_ethtool_set_link_ksettings,
 788         .get_ts_info    = ethtool_op_get_ts_info,
 789         .self_test      = net_selftest,
 790         .get_strings    = smsc95xx_ethtool_get_strings,
 791         .get_sset_count = smsc95xx_ethtool_get_sset_count,
 792 };
 793
 794 static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
 795 {
 796         if (!netif_running(netdev))
 797                 return -EINVAL;
 798
 799         return phy_mii_ioctl(netdev->phydev, rq, cmd);
 800 }
 801
 802 static void smsc95xx_init_mac_address(struct usbnet *dev)
 803 {
 804         u8 addr[ETH_ALEN];
 805
 806         /* maybe the boot loader passed the MAC address in devicetree */
 807         if (!platform_get_ethdev_address(&dev->udev->dev, dev->net)) {
 808                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 809                         /* device tree values are valid so use them */
 810                         netif_dbg(dev, ifup, dev->net, "MAC address read from the device tree\n");
 811                         return;
 812                 }
 813         }
 814
 815         /* try reading mac address from EEPROM */
 816         if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN, addr) == 0) {
 817                 eth_hw_addr_set(dev->net, addr);
 818                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 819                         /* eeprom values are valid so use them */
 820                         netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
 821                         return;
 822                 }
 823         }
 824
 825         /* no useful static MAC address found. generate a random one */
 826         eth_hw_addr_random(dev->net);
 827         netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
 828 }
 829
 830 static int smsc95xx_set_mac_address(struct usbnet *dev)
 831 {
 832         u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
 833                 dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
 834         u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
 835         int ret;
 836
 837         ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
 838         if (ret < 0)
 839                 return ret;
 840
 841         return smsc95xx_write_reg(dev, ADDRH, addr_hi);
 842 }
 843
 844 /* starts the TX path */
 845 static int smsc95xx_start_tx_path(struct usbnet *dev)
 846 {
 847         struct smsc95xx_priv *pdata = dev->driver_priv;
 848         unsigned long flags;
 849         int ret;
 850
 851         /* Enable Tx at MAC */
 852         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 853         pdata->mac_cr |= MAC_CR_TXEN_;
 854         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 855
 856         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 857         if (ret < 0)
 858                 return ret;
 859
 860         /* Enable Tx at SCSRs */
 861         return smsc95xx_write_reg(dev, TX_CFG, TX_CFG_ON_);
 862 }
 863
 864 /* Starts the Receive path */
 865 static int smsc95xx_start_rx_path(struct usbnet *dev)
 866 {
 867         struct smsc95xx_priv *pdata = dev->driver_priv;
 868         unsigned long flags;
 869
 870         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 871         pdata->mac_cr |= MAC_CR_RXEN_;
 872         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 873
 874         return smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 875 }
 876
 877 static int smsc95xx_reset(struct usbnet *dev)
 878 {
 879         struct smsc95xx_priv *pdata = dev->driver_priv;
 880         u32 read_buf, write_buf, burst_cap;
 881         int ret = 0, timeout;
 882
 883         netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
 884
 885         ret = smsc95xx_write_reg(dev, HW_CFG, HW_CFG_LRST_);
 886         if (ret < 0)
 887                 return ret;
 888
 889         timeout = 0;
 890         do {
 891                 msleep(10);
 892                 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 893                 if (ret < 0)
 894                         return ret;
 895                 timeout++;
 896         } while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
 897
 898         if (timeout >= 100) {
 899                 netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
 900                 return ret;
 901         }
 902
 903         ret = smsc95xx_set_mac_address(dev);
 904         if (ret < 0)
 905                 return ret;
 906
 907         netif_dbg(dev, ifup, dev->net, "MAC Address: %pM\n",
 908                   dev->net->dev_addr);
 909
 910         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 911         if (ret < 0)
 912                 return ret;
 913
 914         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x\n",
 915                   read_buf);
 916
 917         read_buf |= HW_CFG_BIR_;
 918
 919         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 920         if (ret < 0)
 921                 return ret;
 922
 923         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 924         if (ret < 0)
 925                 return ret;
 926
 927         netif_dbg(dev, ifup, dev->net,
 928                   "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
 929                   read_buf);
 930
 931         if (!turbo_mode) {
 932                 burst_cap = 0;
 933                 dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
 934         } else if (dev->udev->speed == USB_SPEED_HIGH) {
 935                 burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
 936                 dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
 937         } else {
 938                 burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
 939                 dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
 940         }
 941
 942         netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld\n",
 943                   (ulong)dev->rx_urb_size);
 944
 945         ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
 946         if (ret < 0)
 947                 return ret;
 948
 949         ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
 950         if (ret < 0)
 951                 return ret;
 952
 953         netif_dbg(dev, ifup, dev->net,
 954                   "Read Value from BURST_CAP after writing: 0x%08x\n",
 955                   read_buf);
 956
 957         ret = smsc95xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
 958         if (ret < 0)
 959                 return ret;
 960
 961         ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
 962         if (ret < 0)
 963                 return ret;
 964
 965         netif_dbg(dev, ifup, dev->net,
 966                   "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
 967                   read_buf);
 968
 969         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 970         if (ret < 0)
 971                 return ret;
 972
 973         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG: 0x%08x\n",
 974                   read_buf);
 975
 976         if (turbo_mode)
 977                 read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
 978
 979         read_buf &= ~HW_CFG_RXDOFF_;
 980
 981         /* set Rx data offset=2, Make IP header aligns on word boundary. */
 982         read_buf |= NET_IP_ALIGN << 9;
 983
 984         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 985         if (ret < 0)
 986                 return ret;
 987
 988         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 989         if (ret < 0)
 990                 return ret;
 991
 992         netif_dbg(dev, ifup, dev->net,
 993                   "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
 994
 995         ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
 996         if (ret < 0)
 997                 return ret;
 998
 999         ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
1000         if (ret < 0)
1001                 return ret;
1002         netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
1003
1004         /* Configure GPIO pins as LED outputs */
1005         write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
1006                 LED_GPIO_CFG_FDX_LED;
1007         ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
1008         if (ret < 0)
1009                 return ret;
1010
1011         /* Init Tx */
1012         ret = smsc95xx_write_reg(dev, FLOW, 0);
1013         if (ret < 0)
1014                 return ret;
1015
1016         ret = smsc95xx_write_reg(dev, AFC_CFG, AFC_CFG_DEFAULT);
1017         if (ret < 0)
1018                 return ret;
1019
1020         /* Don't need mac_cr_lock during initialisation */
1021         ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
1022         if (ret < 0)
1023                 return ret;
1024
1025         /* Init Rx */
1026         /* Set Vlan */
1027         ret = smsc95xx_write_reg(dev, VLAN1, (u32)ETH_P_8021Q);
1028         if (ret < 0)
1029                 return ret;
1030
1031         /* Enable or disable checksum offload engines */
1032         ret = smsc95xx_set_features(dev->net, dev->net->features);
1033         if (ret < 0) {
1034                 netdev_warn(dev->net, "Failed to set checksum offload features\n");
1035                 return ret;
1036         }
1037
1038         smsc95xx_set_multicast(dev->net);
1039
1040         ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
1041         if (ret < 0)
1042                 return ret;
1043
1044         /* enable PHY interrupts */
1045         read_buf |= INT_EP_CTL_PHY_INT_;
1046
1047         ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
1048         if (ret < 0)
1049                 return ret;
1050
1051         ret = smsc95xx_start_tx_path(dev);
1052         if (ret < 0) {
1053                 netdev_warn(dev->net, "Failed to start TX path\n");
1054                 return ret;
1055         }
1056
1057         ret = smsc95xx_start_rx_path(dev);
1058         if (ret < 0) {
1059                 netdev_warn(dev->net, "Failed to start RX path\n");
1060                 return ret;
1061         }
1062
1063         netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1064         return 0;
1065 }
1066
1067 static const struct net_device_ops smsc95xx_netdev_ops = {
1068         .ndo_open               = usbnet_open,
1069         .ndo_stop               = usbnet_stop,
1070         .ndo_start_xmit         = usbnet_start_xmit,
1071         .ndo_tx_timeout         = usbnet_tx_timeout,
1072         .ndo_change_mtu         = usbnet_change_mtu,
1073         .ndo_get_stats64        = dev_get_tstats64,
1074         .ndo_set_mac_address    = eth_mac_addr,
1075         .ndo_validate_addr      = eth_validate_addr,
1076         .ndo_eth_ioctl          = smsc95xx_ioctl,
1077         .ndo_set_rx_mode        = smsc95xx_set_multicast,
1078         .ndo_set_features       = smsc95xx_set_features,
1079 };
1080
1081 static void smsc95xx_handle_link_change(struct net_device *net)
1082 {
1083         struct usbnet *dev = netdev_priv(net);
1084
1085         phy_print_status(net->phydev);
1086         smsc95xx_mac_update_fullduplex(dev);
1087         usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1088 }
1089
1090 static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1091 {
1092         struct smsc95xx_priv *pdata;
1093         char usb_path[64];
1094         int ret, phy_irq;
1095         u32 val;
1096
1097         printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1098
1099         ret = usbnet_get_endpoints(dev, intf);
1100         if (ret < 0) {
1101                 netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1102                 return ret;
1103         }
1104
1105         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
1106         if (!pdata)
1107                 return -ENOMEM;
1108
1109         dev->driver_priv = pdata;
1110
1111         spin_lock_init(&pdata->mac_cr_lock);
1112
1113         /* LAN95xx devices do not alter the computed checksum of 0 to 0xffff.
1114          * RFC 2460, ipv6 UDP calculated checksum yields a result of zero must
1115          * be changed to 0xffff. RFC 768, ipv4 UDP computed checksum is zero,
1116          * it is transmitted as all ones. The zero transmitted checksum means
1117          * transmitter generated no checksum. Hence, enable csum offload only
1118          * for ipv4 packets.
1119          */
1120         if (DEFAULT_TX_CSUM_ENABLE)
1121                 dev->net->features |= NETIF_F_IP_CSUM;
1122         if (DEFAULT_RX_CSUM_ENABLE)
1123                 dev->net->features |= NETIF_F_RXCSUM;
1124
1125         dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1126         set_bit(EVENT_NO_IP_ALIGN, &dev->flags);
1127
1128         smsc95xx_init_mac_address(dev);
1129
1130         /* Init all registers */
1131         ret = smsc95xx_reset(dev);
1132         if (ret)
1133                 goto free_pdata;
1134
1135         /* create irq domain for use by PHY driver and GPIO consumers */
1136         usb_make_path(dev->udev, usb_path, sizeof(usb_path));
1137         pdata->irqfwnode = irq_domain_alloc_named_fwnode(usb_path);
1138         if (!pdata->irqfwnode) {
1139                 ret = -ENOMEM;
1140                 goto free_pdata;
1141         }
1142
1143         pdata->irqdomain = irq_domain_create_linear(pdata->irqfwnode,
1144                                                     SMSC95XX_NR_IRQS,
1145                                                     &irq_domain_simple_ops,
1146                                                     pdata);
1147         if (!pdata->irqdomain) {
1148                 ret = -ENOMEM;
1149                 goto free_irqfwnode;
1150         }
1151
1152         phy_irq = irq_create_mapping(pdata->irqdomain, PHY_HWIRQ);
1153         if (!phy_irq) {
1154                 ret = -ENOENT;
1155                 goto remove_irqdomain;
1156         }
1157
1158         pdata->irqchip = dummy_irq_chip;
1159         pdata->irqchip.name = SMSC_CHIPNAME;
1160         irq_set_chip_and_handler_name(phy_irq, &pdata->irqchip,
1161                                       handle_simple_irq, "phy");
1162
1163         pdata->mdiobus = mdiobus_alloc();
1164         if (!pdata->mdiobus) {
1165                 ret = -ENOMEM;
1166                 goto dispose_irq;
1167         }
1168
1169         ret = smsc95xx_read_reg(dev, HW_CFG, &val);
1170         if (ret < 0)
1171                 goto free_mdio;
1172
1173         pdata->is_internal_phy = !(val & HW_CFG_PSEL_);
1174         if (pdata->is_internal_phy)
1175                 pdata->mdiobus->phy_mask = ~(1u << SMSC95XX_INTERNAL_PHY_ID);
1176
1177         pdata->mdiobus->priv = dev;
1178         pdata->mdiobus->read = smsc95xx_mdiobus_read;
1179         pdata->mdiobus->write = smsc95xx_mdiobus_write;
1180         pdata->mdiobus->reset = smsc95xx_mdiobus_reset;
1181         pdata->mdiobus->name = "smsc95xx-mdiobus";
1182         pdata->mdiobus->parent = &dev->udev->dev;
1183
1184         snprintf(pdata->mdiobus->id, ARRAY_SIZE(pdata->mdiobus->id),
1185                  "usb-%03d:%03d", dev->udev->bus->busnum, dev->udev->devnum);
1186
1187         ret = mdiobus_register(pdata->mdiobus);
1188         if (ret) {
1189                 netdev_err(dev->net, "Could not register MDIO bus\n");
1190                 goto free_mdio;
1191         }
1192
1193         pdata->phydev = phy_find_first(pdata->mdiobus);
1194         if (!pdata->phydev) {
1195                 netdev_err(dev->net, "no PHY found\n");
1196                 ret = -ENODEV;
1197                 goto unregister_mdio;
1198         }
1199
1200         pdata->phydev->irq = phy_irq;
1201         pdata->phydev->is_internal = pdata->is_internal_phy;
1202
1203         /* detect device revision as different features may be available */
1204         ret = smsc95xx_read_reg(dev, ID_REV, &val);
1205         if (ret < 0)
1206                 goto unregister_mdio;
1207
1208         val >>= 16;
1209         if ((val == ID_REV_CHIP_ID_9500A_) || (val == ID_REV_CHIP_ID_9530_) ||
1210             (val == ID_REV_CHIP_ID_89530_) || (val == ID_REV_CHIP_ID_9730_))
1211                 pdata->features = (FEATURE_8_WAKEUP_FILTERS |
1212                         FEATURE_PHY_NLP_CROSSOVER |
1213                         FEATURE_REMOTE_WAKEUP);
1214         else if (val == ID_REV_CHIP_ID_9512_)
1215                 pdata->features = FEATURE_8_WAKEUP_FILTERS;
1216
1217         dev->net->netdev_ops = &smsc95xx_netdev_ops;
1218         dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1219         dev->net->flags |= IFF_MULTICAST;
1220         dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
1221         dev->net->min_mtu = ETH_MIN_MTU;
1222         dev->net->max_mtu = ETH_DATA_LEN;
1223         dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
1224
1225         ret = phy_connect_direct(dev->net, pdata->phydev,
1226                                  &smsc95xx_handle_link_change,
1227                                  PHY_INTERFACE_MODE_MII);
1228         if (ret) {
1229                 netdev_err(dev->net, "can't attach PHY to %s\n", pdata->mdiobus->id);
1230                 goto unregister_mdio;
1231         }
1232
1233         phy_attached_info(dev->net->phydev);
1234
1235         return 0;
1236
1237 unregister_mdio:
1238         mdiobus_unregister(pdata->mdiobus);
1239
1240 free_mdio:
1241         mdiobus_free(pdata->mdiobus);
1242
1243 dispose_irq:
1244         irq_dispose_mapping(phy_irq);
1245
1246 remove_irqdomain:
1247         irq_domain_remove(pdata->irqdomain);
1248
1249 free_irqfwnode:
1250         irq_domain_free_fwnode(pdata->irqfwnode);
1251
1252 free_pdata:
1253         kfree(pdata);
1254         return ret;
1255 }
1256
1257 static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1258 {
1259         struct smsc95xx_priv *pdata = dev->driver_priv;
1260
1261         phy_disconnect(dev->net->phydev);
1262         mdiobus_unregister(pdata->mdiobus);
1263         mdiobus_free(pdata->mdiobus);
1264         irq_dispose_mapping(irq_find_mapping(pdata->irqdomain, PHY_HWIRQ));
1265         irq_domain_remove(pdata->irqdomain);
1266         irq_domain_free_fwnode(pdata->irqfwnode);
1267         netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1268         kfree(pdata);
1269 }
1270
1271 static int smsc95xx_start_phy(struct usbnet *dev)
1272 {
1273         phy_start(dev->net->phydev);
1274
1275         return 0;
1276 }
1277
1278 static int smsc95xx_stop(struct usbnet *dev)
1279 {
1280         phy_stop(dev->net->phydev);
1281
1282         return 0;
1283 }
1284
1285 static u32 smsc_crc(const u8 *buffer, size_t len, int filter)
1286 {
1287         u32 crc = bitrev16(crc16(0xFFFF, buffer, len));
1288         return crc << ((filter % 2) * 16);
1289 }
1290
1291 static int smsc95xx_link_ok(struct usbnet *dev)
1292 {
1293         struct smsc95xx_priv *pdata = dev->driver_priv;
1294         int ret;
1295
1296         /* first, a dummy read, needed to latch some MII phys */
1297         ret = smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, MII_BMSR);
1298         if (ret < 0)
1299                 return ret;
1300
1301         ret = smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, MII_BMSR);
1302         if (ret < 0)
1303                 return ret;
1304
1305         return !!(ret & BMSR_LSTATUS);
1306 }
1307
1308 static int smsc95xx_enter_suspend0(struct usbnet *dev)
1309 {
1310         struct smsc95xx_priv *pdata = dev->driver_priv;
1311         u32 val;
1312         int ret;
1313
1314         ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1315         if (ret < 0)
1316                 return ret;
1317
1318         val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
1319         val |= PM_CTL_SUS_MODE_0;
1320
1321         ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1322         if (ret < 0)
1323                 return ret;
1324
1325         /* clear wol status */
1326         val &= ~PM_CTL_WUPS_;
1327         val |= PM_CTL_WUPS_WOL_;
1328
1329         /* enable energy detection */
1330         if (pdata->wolopts & WAKE_PHY)
1331                 val |= PM_CTL_WUPS_ED_;
1332
1333         ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1334         if (ret < 0)
1335                 return ret;
1336
1337         /* read back PM_CTRL */
1338         ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1339         if (ret < 0)
1340                 return ret;
1341
1342         pdata->suspend_flags |= SUSPEND_SUSPEND0;
1343
1344         return 0;
1345 }
1346
1347 static int smsc95xx_enter_suspend1(struct usbnet *dev)
1348 {
1349         struct smsc95xx_priv *pdata = dev->driver_priv;
1350         int ret, phy_id = pdata->phydev->mdio.addr;
1351         u32 val;
1352
1353         /* reconfigure link pulse detection timing for
1354          * compatibility with non-standard link partners
1355          */
1356         if (pdata->features & FEATURE_PHY_NLP_CROSSOVER)
1357                 smsc95xx_mdio_write(dev, phy_id, PHY_EDPD_CONFIG,
1358                                     PHY_EDPD_CONFIG_DEFAULT);
1359
1360         /* enable energy detect power-down mode */
1361         ret = smsc95xx_mdio_read(dev, phy_id, PHY_MODE_CTRL_STS);
1362         if (ret < 0)
1363                 return ret;
1364
1365         ret |= MODE_CTRL_STS_EDPWRDOWN_;
1366
1367         smsc95xx_mdio_write(dev, phy_id, PHY_MODE_CTRL_STS, ret);
1368
1369         /* enter SUSPEND1 mode */
1370         ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1371         if (ret < 0)
1372                 return ret;
1373
1374         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1375         val |= PM_CTL_SUS_MODE_1;
1376
1377         ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1378         if (ret < 0)
1379                 return ret;
1380
1381         /* clear wol status, enable energy detection */
1382         val &= ~PM_CTL_WUPS_;
1383         val |= (PM_CTL_WUPS_ED_ | PM_CTL_ED_EN_);
1384
1385         ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1386         if (ret < 0)
1387                 return ret;
1388
1389         pdata->suspend_flags |= SUSPEND_SUSPEND1;
1390
1391         return 0;
1392 }
1393
1394 static int smsc95xx_enter_suspend2(struct usbnet *dev)
1395 {
1396         struct smsc95xx_priv *pdata = dev->driver_priv;
1397         u32 val;
1398         int ret;
1399
1400         ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1401         if (ret < 0)
1402                 return ret;
1403
1404         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1405         val |= PM_CTL_SUS_MODE_2;
1406
1407         ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1408         if (ret < 0)
1409                 return ret;
1410
1411         pdata->suspend_flags |= SUSPEND_SUSPEND2;
1412
1413         return 0;
1414 }
1415
1416 static int smsc95xx_enter_suspend3(struct usbnet *dev)
1417 {
1418         struct smsc95xx_priv *pdata = dev->driver_priv;
1419         u32 val;
1420         int ret;
1421
1422         ret = smsc95xx_read_reg(dev, RX_FIFO_INF, &val);
1423         if (ret < 0)
1424                 return ret;
1425
1426         if (val & RX_FIFO_INF_USED_) {
1427                 netdev_info(dev->net, "rx fifo not empty in autosuspend\n");
1428                 return -EBUSY;
1429         }
1430
1431         ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1432         if (ret < 0)
1433                 return ret;
1434
1435         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1436         val |= PM_CTL_SUS_MODE_3 | PM_CTL_RES_CLR_WKP_STS;
1437
1438         ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1439         if (ret < 0)
1440                 return ret;
1441
1442         /* clear wol status */
1443         val &= ~PM_CTL_WUPS_;
1444         val |= PM_CTL_WUPS_WOL_;
1445
1446         ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1447         if (ret < 0)
1448                 return ret;
1449
1450         pdata->suspend_flags |= SUSPEND_SUSPEND3;
1451
1452         return 0;
1453 }
1454
1455 static int smsc95xx_autosuspend(struct usbnet *dev, u32 link_up)
1456 {
1457         struct smsc95xx_priv *pdata = dev->driver_priv;
1458
1459         if (!netif_running(dev->net)) {
1460                 /* interface is ifconfig down so fully power down hw */
1461                 netdev_dbg(dev->net, "autosuspend entering SUSPEND2\n");
1462                 return smsc95xx_enter_suspend2(dev);
1463         }
1464
1465         if (!link_up) {
1466                 /* link is down so enter EDPD mode, but only if device can
1467                  * reliably resume from it.  This check should be redundant
1468                  * as current FEATURE_REMOTE_WAKEUP parts also support
1469                  * FEATURE_PHY_NLP_CROSSOVER but it's included for clarity */
1470                 if (!(pdata->features & FEATURE_PHY_NLP_CROSSOVER)) {
1471                         netdev_warn(dev->net, "EDPD not supported\n");
1472                         return -EBUSY;
1473                 }
1474
1475                 netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n");
1476                 netdev_info(dev->net, "entering SUSPEND1 mode\n");
1477                 return smsc95xx_enter_suspend1(dev);
1478         }
1479
1480         netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n");
1481         return smsc95xx_enter_suspend3(dev);
1482 }
1483
1484 static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
1485 {
1486         struct usbnet *dev = usb_get_intfdata(intf);
1487         struct smsc95xx_priv *pdata = dev->driver_priv;
1488         u32 val, link_up;
1489         int ret;
1490
1491         pdata->pm_task = current;
1492
1493         ret = usbnet_suspend(intf, message);
1494         if (ret < 0) {
1495                 netdev_warn(dev->net, "usbnet_suspend error\n");
1496                 pdata->pm_task = NULL;
1497                 return ret;
1498         }
1499
1500         if (pdata->suspend_flags) {
1501                 netdev_warn(dev->net, "error during last resume\n");
1502                 pdata->suspend_flags = 0;
1503         }
1504
1505         link_up = smsc95xx_link_ok(dev);
1506
1507         if (message.event == PM_EVENT_AUTO_SUSPEND &&
1508             (pdata->features & FEATURE_REMOTE_WAKEUP)) {
1509                 ret = smsc95xx_autosuspend(dev, link_up);
1510                 goto done;
1511         }
1512
1513         /* if we get this far we're not autosuspending */
1514         /* if no wol options set, or if link is down and we're not waking on
1515          * PHY activity, enter lowest power SUSPEND2 mode
1516          */
1517         if (!(pdata->wolopts & SUPPORTED_WAKE) ||
1518                 !(link_up || (pdata->wolopts & WAKE_PHY))) {
1519                 netdev_info(dev->net, "entering SUSPEND2 mode\n");
1520
1521                 /* disable energy detect (link up) & wake up events */
1522                 ret = smsc95xx_read_reg(dev, WUCSR, &val);
1523                 if (ret < 0)
1524                         goto done;
1525
1526                 val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
1527
1528                 ret = smsc95xx_write_reg(dev, WUCSR, val);
1529                 if (ret < 0)
1530                         goto done;
1531
1532                 ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1533                 if (ret < 0)
1534                         goto done;
1535
1536                 val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
1537
1538                 ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1539                 if (ret < 0)
1540                         goto done;
1541
1542                 ret = smsc95xx_enter_suspend2(dev);
1543                 goto done;
1544         }
1545
1546         if (pdata->wolopts & WAKE_PHY) {
1547                 /* if link is down then configure EDPD and enter SUSPEND1,
1548                  * otherwise enter SUSPEND0 below
1549                  */
1550                 if (!link_up) {
1551                         netdev_info(dev->net, "entering SUSPEND1 mode\n");
1552                         ret = smsc95xx_enter_suspend1(dev);
1553                         goto done;
1554                 }
1555         }
1556
1557         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1558                 u32 *filter_mask = kcalloc(32, sizeof(u32), GFP_KERNEL);
1559                 u32 command[2];
1560                 u32 offset[2];
1561                 u32 crc[4];
1562                 int wuff_filter_count =
1563                         (pdata->features & FEATURE_8_WAKEUP_FILTERS) ?
1564                         LAN9500A_WUFF_NUM : LAN9500_WUFF_NUM;
1565                 int i, filter = 0;
1566
1567                 if (!filter_mask) {
1568                         netdev_warn(dev->net, "Unable to allocate filter_mask\n");
1569                         ret = -ENOMEM;
1570                         goto done;
1571                 }
1572
1573                 memset(command, 0, sizeof(command));
1574                 memset(offset, 0, sizeof(offset));
1575                 memset(crc, 0, sizeof(crc));
1576
1577                 if (pdata->wolopts & WAKE_BCAST) {
1578                         const u8 bcast[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
1579                         netdev_info(dev->net, "enabling broadcast detection\n");
1580                         filter_mask[filter * 4] = 0x003F;
1581                         filter_mask[filter * 4 + 1] = 0x00;
1582                         filter_mask[filter * 4 + 2] = 0x00;
1583                         filter_mask[filter * 4 + 3] = 0x00;
1584                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1585                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1586                         crc[filter/2] |= smsc_crc(bcast, 6, filter);
1587                         filter++;
1588                 }
1589
1590                 if (pdata->wolopts & WAKE_MCAST) {
1591                         const u8 mcast[] = {0x01, 0x00, 0x5E};
1592                         netdev_info(dev->net, "enabling multicast detection\n");
1593                         filter_mask[filter * 4] = 0x0007;
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] |= 0x09UL << ((filter % 4) * 8);
1598                         offset[filter/4] |= 0x00  << ((filter % 4) * 8);
1599                         crc[filter/2] |= smsc_crc(mcast, 3, filter);
1600                         filter++;
1601                 }
1602
1603                 if (pdata->wolopts & WAKE_ARP) {
1604                         const u8 arp[] = {0x08, 0x06};
1605                         netdev_info(dev->net, "enabling ARP detection\n");
1606                         filter_mask[filter * 4] = 0x0003;
1607                         filter_mask[filter * 4 + 1] = 0x00;
1608                         filter_mask[filter * 4 + 2] = 0x00;
1609                         filter_mask[filter * 4 + 3] = 0x00;
1610                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1611                         offset[filter/4] |= 0x0C << ((filter % 4) * 8);
1612                         crc[filter/2] |= smsc_crc(arp, 2, filter);
1613                         filter++;
1614                 }
1615
1616                 if (pdata->wolopts & WAKE_UCAST) {
1617                         netdev_info(dev->net, "enabling unicast detection\n");
1618                         filter_mask[filter * 4] = 0x003F;
1619                         filter_mask[filter * 4 + 1] = 0x00;
1620                         filter_mask[filter * 4 + 2] = 0x00;
1621                         filter_mask[filter * 4 + 3] = 0x00;
1622                         command[filter/4] |= 0x01UL << ((filter % 4) * 8);
1623                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1624                         crc[filter/2] |= smsc_crc(dev->net->dev_addr, ETH_ALEN, filter);
1625                         filter++;
1626                 }
1627
1628                 for (i = 0; i < (wuff_filter_count * 4); i++) {
1629                         ret = smsc95xx_write_reg(dev, WUFF, filter_mask[i]);
1630                         if (ret < 0) {
1631                                 kfree(filter_mask);
1632                                 goto done;
1633                         }
1634                 }
1635                 kfree(filter_mask);
1636
1637                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1638                         ret = smsc95xx_write_reg(dev, WUFF, command[i]);
1639                         if (ret < 0)
1640                                 goto done;
1641                 }
1642
1643                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1644                         ret = smsc95xx_write_reg(dev, WUFF, offset[i]);
1645                         if (ret < 0)
1646                                 goto done;
1647                 }
1648
1649                 for (i = 0; i < (wuff_filter_count / 2); i++) {
1650                         ret = smsc95xx_write_reg(dev, WUFF, crc[i]);
1651                         if (ret < 0)
1652                                 goto done;
1653                 }
1654
1655                 /* clear any pending pattern match packet status */
1656                 ret = smsc95xx_read_reg(dev, WUCSR, &val);
1657                 if (ret < 0)
1658                         goto done;
1659
1660                 val |= WUCSR_WUFR_;
1661
1662                 ret = smsc95xx_write_reg(dev, WUCSR, val);
1663                 if (ret < 0)
1664                         goto done;
1665         }
1666
1667         if (pdata->wolopts & WAKE_MAGIC) {
1668                 /* clear any pending magic packet status */
1669                 ret = smsc95xx_read_reg(dev, WUCSR, &val);
1670                 if (ret < 0)
1671                         goto done;
1672
1673                 val |= WUCSR_MPR_;
1674
1675                 ret = smsc95xx_write_reg(dev, WUCSR, val);
1676                 if (ret < 0)
1677                         goto done;
1678         }
1679
1680         /* enable/disable wakeup sources */
1681         ret = smsc95xx_read_reg(dev, WUCSR, &val);
1682         if (ret < 0)
1683                 goto done;
1684
1685         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1686                 netdev_info(dev->net, "enabling pattern match wakeup\n");
1687                 val |= WUCSR_WAKE_EN_;
1688         } else {
1689                 netdev_info(dev->net, "disabling pattern match wakeup\n");
1690                 val &= ~WUCSR_WAKE_EN_;
1691         }
1692
1693         if (pdata->wolopts & WAKE_MAGIC) {
1694                 netdev_info(dev->net, "enabling magic packet wakeup\n");
1695                 val |= WUCSR_MPEN_;
1696         } else {
1697                 netdev_info(dev->net, "disabling magic packet wakeup\n");
1698                 val &= ~WUCSR_MPEN_;
1699         }
1700
1701         ret = smsc95xx_write_reg(dev, WUCSR, val);
1702         if (ret < 0)
1703                 goto done;
1704
1705         /* enable wol wakeup source */
1706         ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1707         if (ret < 0)
1708                 goto done;
1709
1710         val |= PM_CTL_WOL_EN_;
1711
1712         /* phy energy detect wakeup source */
1713         if (pdata->wolopts & WAKE_PHY)
1714                 val |= PM_CTL_ED_EN_;
1715
1716         ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1717         if (ret < 0)
1718                 goto done;
1719
1720         /* enable receiver to enable frame reception */
1721         smsc95xx_start_rx_path(dev);
1722
1723         /* some wol options are enabled, so enter SUSPEND0 */
1724         netdev_info(dev->net, "entering SUSPEND0 mode\n");
1725         ret = smsc95xx_enter_suspend0(dev);
1726
1727 done:
1728         /*
1729          * TODO: resume() might need to handle the suspend failure
1730          * in system sleep
1731          */
1732         if (ret && PMSG_IS_AUTO(message))
1733                 usbnet_resume(intf);
1734
1735         pdata->pm_task = NULL;
1736         return ret;
1737 }
1738
1739 static int smsc95xx_resume(struct usb_interface *intf)
1740 {
1741         struct usbnet *dev = usb_get_intfdata(intf);
1742         struct smsc95xx_priv *pdata;
1743         u8 suspend_flags;
1744         int ret;
1745         u32 val;
1746
1747         BUG_ON(!dev);
1748         pdata = dev->driver_priv;
1749         suspend_flags = pdata->suspend_flags;
1750
1751         netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags);
1752
1753         /* do this first to ensure it's cleared even in error case */
1754         pdata->suspend_flags = 0;
1755
1756         pdata->pm_task = current;
1757
1758         if (suspend_flags & SUSPEND_ALLMODES) {
1759                 /* clear wake-up sources */
1760                 ret = smsc95xx_read_reg(dev, WUCSR, &val);
1761                 if (ret < 0)
1762                         goto done;
1763
1764                 val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
1765
1766                 ret = smsc95xx_write_reg(dev, WUCSR, val);
1767                 if (ret < 0)
1768                         goto done;
1769
1770                 /* clear wake-up status */
1771                 ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1772                 if (ret < 0)
1773                         goto done;
1774
1775                 val &= ~PM_CTL_WOL_EN_;
1776                 val |= PM_CTL_WUPS_;
1777
1778                 ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1779                 if (ret < 0)
1780                         goto done;
1781         }
1782
1783         phy_init_hw(pdata->phydev);
1784
1785         ret = usbnet_resume(intf);
1786         if (ret < 0)
1787                 netdev_warn(dev->net, "usbnet_resume error\n");
1788
1789 done:
1790         pdata->pm_task = NULL;
1791         return ret;
1792 }
1793
1794 static int smsc95xx_reset_resume(struct usb_interface *intf)
1795 {
1796         struct usbnet *dev = usb_get_intfdata(intf);
1797         struct smsc95xx_priv *pdata = dev->driver_priv;
1798         int ret;
1799
1800         pdata->pm_task = current;
1801         ret = smsc95xx_reset(dev);
1802         pdata->pm_task = NULL;
1803         if (ret < 0)
1804                 return ret;
1805
1806         return smsc95xx_resume(intf);
1807 }
1808
1809 static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1810 {
1811         skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
1812         skb->ip_summed = CHECKSUM_COMPLETE;
1813         skb_trim(skb, skb->len - 2);
1814 }
1815
1816 static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1817 {
1818         /* This check is no longer done by usbnet */
1819         if (skb->len < dev->net->hard_header_len)
1820                 return 0;
1821
1822         while (skb->len > 0) {
1823                 u32 header, align_count;
1824                 struct sk_buff *ax_skb;
1825                 unsigned char *packet;
1826                 u16 size;
1827
1828                 header = get_unaligned_le32(skb->data);
1829                 skb_pull(skb, 4 + NET_IP_ALIGN);
1830                 packet = skb->data;
1831
1832                 /* get the packet length */
1833                 size = (u16)((header & RX_STS_FL_) >> 16);
1834                 align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1835
1836                 if (unlikely(header & RX_STS_ES_)) {
1837                         netif_dbg(dev, rx_err, dev->net,
1838                                   "Error header=0x%08x\n", header);
1839                         dev->net->stats.rx_errors++;
1840                         dev->net->stats.rx_dropped++;
1841
1842                         if (header & RX_STS_CRC_) {
1843                                 dev->net->stats.rx_crc_errors++;
1844                         } else {
1845                                 if (header & (RX_STS_TL_ | RX_STS_RF_))
1846                                         dev->net->stats.rx_frame_errors++;
1847
1848                                 if ((header & RX_STS_LE_) &&
1849                                         (!(header & RX_STS_FT_)))
1850                                         dev->net->stats.rx_length_errors++;
1851                         }
1852                 } else {
1853                         /* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1854                         if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1855                                 netif_dbg(dev, rx_err, dev->net,
1856                                           "size err header=0x%08x\n", header);
1857                                 return 0;
1858                         }
1859
1860                         /* last frame in this batch */
1861                         if (skb->len == size) {
1862                                 if (dev->net->features & NETIF_F_RXCSUM)
1863                                         smsc95xx_rx_csum_offload(skb);
1864                                 skb_trim(skb, skb->len - 4); /* remove fcs */
1865                                 skb->truesize = size + sizeof(struct sk_buff);
1866
1867                                 return 1;
1868                         }
1869
1870                         ax_skb = skb_clone(skb, GFP_ATOMIC);
1871                         if (unlikely(!ax_skb)) {
1872                                 netdev_warn(dev->net, "Error allocating skb\n");
1873                                 return 0;
1874                         }
1875
1876                         ax_skb->len = size;
1877                         ax_skb->data = packet;
1878                         skb_set_tail_pointer(ax_skb, size);
1879
1880                         if (dev->net->features & NETIF_F_RXCSUM)
1881                                 smsc95xx_rx_csum_offload(ax_skb);
1882                         skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1883                         ax_skb->truesize = size + sizeof(struct sk_buff);
1884
1885                         usbnet_skb_return(dev, ax_skb);
1886                 }
1887
1888                 skb_pull(skb, size);
1889
1890                 /* padding bytes before the next frame starts */
1891                 if (skb->len)
1892                         skb_pull(skb, align_count);
1893         }
1894
1895         return 1;
1896 }
1897
1898 static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1899 {
1900         u16 low_16 = (u16)skb_checksum_start_offset(skb);
1901         u16 high_16 = low_16 + skb->csum_offset;
1902         return (high_16 << 16) | low_16;
1903 }
1904
1905 /* The TX CSUM won't work if the checksum lies in the last 4 bytes of the
1906  * transmission. This is fairly unlikely, only seems to trigger with some
1907  * short TCP ACK packets sent.
1908  *
1909  * Note, this calculation should probably check for the alignment of the
1910  * data as well, but a straight check for csum being in the last four bytes
1911  * of the packet should be ok for now.
1912  */
1913 static bool smsc95xx_can_tx_checksum(struct sk_buff *skb)
1914 {
1915        unsigned int len = skb->len - skb_checksum_start_offset(skb);
1916
1917        if (skb->len <= 45)
1918                return false;
1919        return skb->csum_offset < (len - (4 + 1));
1920 }
1921
1922 static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1923                                          struct sk_buff *skb, gfp_t flags)
1924 {
1925         bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
1926         int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
1927         u32 tx_cmd_a, tx_cmd_b;
1928         void *ptr;
1929
1930         /* We do not advertise SG, so skbs should be already linearized */
1931         BUG_ON(skb_shinfo(skb)->nr_frags);
1932
1933         /* Make writable and expand header space by overhead if required */
1934         if (skb_cow_head(skb, overhead)) {
1935                 /* Must deallocate here as returning NULL to indicate error
1936                  * means the skb won't be deallocated in the caller.
1937                  */
1938                 dev_kfree_skb_any(skb);
1939                 return NULL;
1940         }
1941
1942         tx_cmd_b = (u32)skb->len;
1943         tx_cmd_a = tx_cmd_b | TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
1944
1945         if (csum) {
1946                 if (!smsc95xx_can_tx_checksum(skb)) {
1947                         /* workaround - hardware tx checksum does not work
1948                          * properly with extremely small packets */
1949                         long csstart = skb_checksum_start_offset(skb);
1950                         __wsum calc = csum_partial(skb->data + csstart,
1951                                 skb->len - csstart, 0);
1952                         *((__sum16 *)(skb->data + csstart
1953                                 + skb->csum_offset)) = csum_fold(calc);
1954
1955                         csum = false;
1956                 } else {
1957                         u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
1958                         ptr = skb_push(skb, 4);
1959                         put_unaligned_le32(csum_preamble, ptr);
1960
1961                         tx_cmd_a += 4;
1962                         tx_cmd_b += 4;
1963                         tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
1964                 }
1965         }
1966
1967         ptr = skb_push(skb, 8);
1968         put_unaligned_le32(tx_cmd_a, ptr);
1969         put_unaligned_le32(tx_cmd_b, ptr+4);
1970
1971         return skb;
1972 }
1973
1974 static int smsc95xx_manage_power(struct usbnet *dev, int on)
1975 {
1976         struct smsc95xx_priv *pdata = dev->driver_priv;
1977
1978         dev->intf->needs_remote_wakeup = on;
1979
1980         if (pdata->features & FEATURE_REMOTE_WAKEUP)
1981                 return 0;
1982
1983         /* this chip revision isn't capable of remote wakeup */
1984         netdev_info(dev->net, "hardware isn't capable of remote wakeup\n");
1985
1986         if (on)
1987                 usb_autopm_get_interface_no_resume(dev->intf);
1988         else
1989                 usb_autopm_put_interface(dev->intf);
1990
1991         return 0;
1992 }
1993
1994 static const struct driver_info smsc95xx_info = {
1995         .description    = "smsc95xx USB 2.0 Ethernet",
1996         .bind           = smsc95xx_bind,
1997         .unbind         = smsc95xx_unbind,
1998         .reset          = smsc95xx_reset,
1999         .check_connect  = smsc95xx_start_phy,
2000         .stop           = smsc95xx_stop,
2001         .rx_fixup       = smsc95xx_rx_fixup,
2002         .tx_fixup       = smsc95xx_tx_fixup,
2003         .status         = smsc95xx_status,
2004         .manage_power   = smsc95xx_manage_power,
2005         .flags          = FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
2006 };
2007
2008 static const struct usb_device_id products[] = {
2009         {
2010                 /* SMSC9500 USB Ethernet Device */
2011                 USB_DEVICE(0x0424, 0x9500),
2012                 .driver_info = (unsigned long) &smsc95xx_info,
2013         },
2014         {
2015                 /* SMSC9505 USB Ethernet Device */
2016                 USB_DEVICE(0x0424, 0x9505),
2017                 .driver_info = (unsigned long) &smsc95xx_info,
2018         },
2019         {
2020                 /* SMSC9500A USB Ethernet Device */
2021                 USB_DEVICE(0x0424, 0x9E00),
2022                 .driver_info = (unsigned long) &smsc95xx_info,
2023         },
2024         {
2025                 /* SMSC9505A USB Ethernet Device */
2026                 USB_DEVICE(0x0424, 0x9E01),
2027                 .driver_info = (unsigned long) &smsc95xx_info,
2028         },
2029         {
2030                 /* SMSC9512/9514 USB Hub & Ethernet Device */
2031                 USB_DEVICE(0x0424, 0xec00),
2032                 .driver_info = (unsigned long) &smsc95xx_info,
2033         },
2034         {
2035                 /* SMSC9500 USB Ethernet Device (SAL10) */
2036                 USB_DEVICE(0x0424, 0x9900),
2037                 .driver_info = (unsigned long) &smsc95xx_info,
2038         },
2039         {
2040                 /* SMSC9505 USB Ethernet Device (SAL10) */
2041                 USB_DEVICE(0x0424, 0x9901),
2042                 .driver_info = (unsigned long) &smsc95xx_info,
2043         },
2044         {
2045                 /* SMSC9500A USB Ethernet Device (SAL10) */
2046                 USB_DEVICE(0x0424, 0x9902),
2047                 .driver_info = (unsigned long) &smsc95xx_info,
2048         },
2049         {
2050                 /* SMSC9505A USB Ethernet Device (SAL10) */
2051                 USB_DEVICE(0x0424, 0x9903),
2052                 .driver_info = (unsigned long) &smsc95xx_info,
2053         },
2054         {
2055                 /* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
2056                 USB_DEVICE(0x0424, 0x9904),
2057                 .driver_info = (unsigned long) &smsc95xx_info,
2058         },
2059         {
2060                 /* SMSC9500A USB Ethernet Device (HAL) */
2061                 USB_DEVICE(0x0424, 0x9905),
2062                 .driver_info = (unsigned long) &smsc95xx_info,
2063         },
2064         {
2065                 /* SMSC9505A USB Ethernet Device (HAL) */
2066                 USB_DEVICE(0x0424, 0x9906),
2067                 .driver_info = (unsigned long) &smsc95xx_info,
2068         },
2069         {
2070                 /* SMSC9500 USB Ethernet Device (Alternate ID) */
2071                 USB_DEVICE(0x0424, 0x9907),
2072                 .driver_info = (unsigned long) &smsc95xx_info,
2073         },
2074         {
2075                 /* SMSC9500A USB Ethernet Device (Alternate ID) */
2076                 USB_DEVICE(0x0424, 0x9908),
2077                 .driver_info = (unsigned long) &smsc95xx_info,
2078         },
2079         {
2080                 /* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
2081                 USB_DEVICE(0x0424, 0x9909),
2082                 .driver_info = (unsigned long) &smsc95xx_info,
2083         },
2084         {
2085                 /* SMSC LAN9530 USB Ethernet Device */
2086                 USB_DEVICE(0x0424, 0x9530),
2087                 .driver_info = (unsigned long) &smsc95xx_info,
2088         },
2089         {
2090                 /* SMSC LAN9730 USB Ethernet Device */
2091                 USB_DEVICE(0x0424, 0x9730),
2092                 .driver_info = (unsigned long) &smsc95xx_info,
2093         },
2094         {
2095                 /* SMSC LAN89530 USB Ethernet Device */
2096                 USB_DEVICE(0x0424, 0x9E08),
2097                 .driver_info = (unsigned long) &smsc95xx_info,
2098         },
2099         {
2100                 /* Microchip's EVB-LAN8670-USB 10BASE-T1S Ethernet Device */
2101                 USB_DEVICE(0x184F, 0x0051),
2102                 .driver_info = (unsigned long)&smsc95xx_info,
2103         },
2104         { },            /* END */
2105 };
2106 MODULE_DEVICE_TABLE(usb, products);
2107
2108 static struct usb_driver smsc95xx_driver = {
2109         .name           = "smsc95xx",
2110         .id_table       = products,
2111         .probe          = usbnet_probe,
2112         .suspend        = smsc95xx_suspend,
2113         .resume         = smsc95xx_resume,
2114         .reset_resume   = smsc95xx_reset_resume,
2115         .disconnect     = usbnet_disconnect,
2116         .disable_hub_initiated_lpm = 1,
2117         .supports_autosuspend = 1,
2118 };
2119
2120 module_usb_driver(smsc95xx_driver);
2121
2122 MODULE_AUTHOR("Nancy Lin");
2123 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
2124 MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
2125 MODULE_LICENSE("GPL");