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         struct irq_chip irqchip;
  70         struct irq_domain *irqdomain;
  71         struct fwnode_handle *irqfwnode;
  72         struct mii_bus *mdiobus;
  73         struct phy_device *phydev;
  74 };
  75
  76 static bool turbo_mode = true;
  77 module_param(turbo_mode, bool, 0644);
  78 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
  79
  80 static int __must_check __smsc95xx_read_reg(struct usbnet *dev, u32 index,
  81                                             u32 *data, int in_pm)
  82 {
  83         u32 buf;
  84         int ret;
  85         int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
  86
  87         BUG_ON(!dev);
  88
  89         if (!in_pm)
  90                 fn = usbnet_read_cmd;
  91         else
  92                 fn = usbnet_read_cmd_nopm;
  93
  94         ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
  95                  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  96                  0, index, &buf, 4);
  97         if (ret < 0) {
  98                 if (ret != -ENODEV)
  99                         netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d\n",
 100                                     index, ret);
 101                 return ret;
 102         }
 103
 104         le32_to_cpus(&buf);
 105         *data = buf;
 106
 107         return ret;
 108 }
 109
 110 static int __must_check __smsc95xx_write_reg(struct usbnet *dev, u32 index,
 111                                              u32 data, int in_pm)
 112 {
 113         u32 buf;
 114         int ret;
 115         int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
 116
 117         BUG_ON(!dev);
 118
 119         if (!in_pm)
 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 static int __must_check smsc95xx_read_reg_nopm(struct usbnet *dev, u32 index,
 138                                                u32 *data)
 139 {
 140         return __smsc95xx_read_reg(dev, index, data, 1);
 141 }
 142
 143 static int __must_check smsc95xx_write_reg_nopm(struct usbnet *dev, u32 index,
 144                                                 u32 data)
 145 {
 146         return __smsc95xx_write_reg(dev, index, data, 1);
 147 }
 148
 149 static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
 150                                           u32 *data)
 151 {
 152         return __smsc95xx_read_reg(dev, index, data, 0);
 153 }
 154
 155 static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
 156                                            u32 data)
 157 {
 158         return __smsc95xx_write_reg(dev, index, data, 0);
 159 }
 160
 161 /* Loop until the read is completed with timeout
 162  * called with phy_mutex held */
 163 static int __must_check __smsc95xx_phy_wait_not_busy(struct usbnet *dev,
 164                                                      int in_pm)
 165 {
 166         unsigned long start_time = jiffies;
 167         u32 val;
 168         int ret;
 169
 170         do {
 171                 ret = __smsc95xx_read_reg(dev, MII_ADDR, &val, in_pm);
 172                 if (ret < 0) {
 173                         /* Ignore -ENODEV error during disconnect() */
 174                         if (ret == -ENODEV)
 175                                 return 0;
 176                         netdev_warn(dev->net, "Error reading MII_ACCESS\n");
 177                         return ret;
 178                 }
 179
 180                 if (!(val & MII_BUSY_))
 181                         return 0;
 182         } while (!time_after(jiffies, start_time + HZ));
 183
 184         return -EIO;
 185 }
 186
 187 static u32 mii_address_cmd(int phy_id, int idx, u16 op)
 188 {
 189         return (phy_id & 0x1f) << 11 | (idx & 0x1f) << 6 | op;
 190 }
 191
 192 static int __smsc95xx_mdio_read(struct usbnet *dev, int phy_id, int idx,
 193                                 int in_pm)
 194 {
 195         u32 val, addr;
 196         int ret;
 197
 198         mutex_lock(&dev->phy_mutex);
 199
 200         /* confirm MII not busy */
 201         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 202         if (ret < 0) {
 203                 netdev_warn(dev->net, "%s: MII is busy\n", __func__);
 204                 goto done;
 205         }
 206
 207         /* set the address, index & direction (read from PHY) */
 208         addr = mii_address_cmd(phy_id, idx, MII_READ_ | MII_BUSY_);
 209         ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
 210         if (ret < 0) {
 211                 if (ret != -ENODEV)
 212                         netdev_warn(dev->net, "Error writing MII_ADDR\n");
 213                 goto done;
 214         }
 215
 216         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 217         if (ret < 0) {
 218                 netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
 219                 goto done;
 220         }
 221
 222         ret = __smsc95xx_read_reg(dev, MII_DATA, &val, in_pm);
 223         if (ret < 0) {
 224                 if (ret != -ENODEV)
 225                         netdev_warn(dev->net, "Error reading MII_DATA\n");
 226                 goto done;
 227         }
 228
 229         ret = (u16)(val & 0xFFFF);
 230
 231 done:
 232         mutex_unlock(&dev->phy_mutex);
 233
 234         /* Ignore -ENODEV error during disconnect() */
 235         if (ret == -ENODEV)
 236                 return 0;
 237         return ret;
 238 }
 239
 240 static void __smsc95xx_mdio_write(struct usbnet *dev, int phy_id,
 241                                   int idx, int regval, int in_pm)
 242 {
 243         u32 val, addr;
 244         int ret;
 245
 246         mutex_lock(&dev->phy_mutex);
 247
 248         /* confirm MII not busy */
 249         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 250         if (ret < 0) {
 251                 netdev_warn(dev->net, "%s: MII is busy\n", __func__);
 252                 goto done;
 253         }
 254
 255         val = regval;
 256         ret = __smsc95xx_write_reg(dev, MII_DATA, val, in_pm);
 257         if (ret < 0) {
 258                 if (ret != -ENODEV)
 259                         netdev_warn(dev->net, "Error writing MII_DATA\n");
 260                 goto done;
 261         }
 262
 263         /* set the address, index & direction (write to PHY) */
 264         addr = mii_address_cmd(phy_id, idx, MII_WRITE_ | MII_BUSY_);
 265         ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
 266         if (ret < 0) {
 267                 if (ret != -ENODEV)
 268                         netdev_warn(dev->net, "Error writing MII_ADDR\n");
 269                 goto done;
 270         }
 271
 272         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 273         if (ret < 0) {
 274                 netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
 275                 goto done;
 276         }
 277
 278 done:
 279         mutex_unlock(&dev->phy_mutex);
 280 }
 281
 282 static int smsc95xx_mdio_read_nopm(struct usbnet *dev, int idx)
 283 {
 284         struct smsc95xx_priv *pdata = dev->driver_priv;
 285
 286         return __smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, idx, 1);
 287 }
 288
 289 static void smsc95xx_mdio_write_nopm(struct usbnet *dev, int idx, int regval)
 290 {
 291         struct smsc95xx_priv *pdata = dev->driver_priv;
 292
 293         __smsc95xx_mdio_write(dev, pdata->phydev->mdio.addr, idx, regval, 1);
 294 }
 295
 296 static int smsc95xx_mdiobus_read(struct mii_bus *bus, int phy_id, int idx)
 297 {
 298         struct usbnet *dev = bus->priv;
 299
 300         return __smsc95xx_mdio_read(dev, phy_id, idx, 0);
 301 }
 302
 303 static int smsc95xx_mdiobus_write(struct mii_bus *bus, int phy_id, int idx,
 304                                   u16 regval)
 305 {
 306         struct usbnet *dev = bus->priv;
 307
 308         __smsc95xx_mdio_write(dev, phy_id, idx, regval, 0);
 309         return 0;
 310 }
 311
 312 static int __must_check smsc95xx_wait_eeprom(struct usbnet *dev)
 313 {
 314         unsigned long start_time = jiffies;
 315         u32 val;
 316         int ret;
 317
 318         do {
 319                 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
 320                 if (ret < 0) {
 321                         netdev_warn(dev->net, "Error reading E2P_CMD\n");
 322                         return ret;
 323                 }
 324
 325                 if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
 326                         break;
 327                 udelay(40);
 328         } while (!time_after(jiffies, start_time + HZ));
 329
 330         if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
 331                 netdev_warn(dev->net, "EEPROM read operation timeout\n");
 332                 return -EIO;
 333         }
 334
 335         return 0;
 336 }
 337
 338 static int __must_check smsc95xx_eeprom_confirm_not_busy(struct usbnet *dev)
 339 {
 340         unsigned long start_time = jiffies;
 341         u32 val;
 342         int ret;
 343
 344         do {
 345                 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
 346                 if (ret < 0) {
 347                         netdev_warn(dev->net, "Error reading E2P_CMD\n");
 348                         return ret;
 349                 }
 350
 351                 if (!(val & E2P_CMD_BUSY_))
 352                         return 0;
 353
 354                 udelay(40);
 355         } while (!time_after(jiffies, start_time + HZ));
 356
 357         netdev_warn(dev->net, "EEPROM is busy\n");
 358         return -EIO;
 359 }
 360
 361 static int smsc95xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
 362                                 u8 *data)
 363 {
 364         u32 val;
 365         int i, ret;
 366
 367         BUG_ON(!dev);
 368         BUG_ON(!data);
 369
 370         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 371         if (ret)
 372                 return ret;
 373
 374         for (i = 0; i < length; i++) {
 375                 val = E2P_CMD_BUSY_ | E2P_CMD_READ_ | (offset & E2P_CMD_ADDR_);
 376                 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 377                 if (ret < 0) {
 378                         netdev_warn(dev->net, "Error writing E2P_CMD\n");
 379                         return ret;
 380                 }
 381
 382                 ret = smsc95xx_wait_eeprom(dev);
 383                 if (ret < 0)
 384                         return ret;
 385
 386                 ret = smsc95xx_read_reg(dev, E2P_DATA, &val);
 387                 if (ret < 0) {
 388                         netdev_warn(dev->net, "Error reading E2P_DATA\n");
 389                         return ret;
 390                 }
 391
 392                 data[i] = val & 0xFF;
 393                 offset++;
 394         }
 395
 396         return 0;
 397 }
 398
 399 static int smsc95xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
 400                                  u8 *data)
 401 {
 402         u32 val;
 403         int i, ret;
 404
 405         BUG_ON(!dev);
 406         BUG_ON(!data);
 407
 408         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 409         if (ret)
 410                 return ret;
 411
 412         /* Issue write/erase enable command */
 413         val = E2P_CMD_BUSY_ | E2P_CMD_EWEN_;
 414         ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 415         if (ret < 0) {
 416                 netdev_warn(dev->net, "Error writing E2P_DATA\n");
 417                 return ret;
 418         }
 419
 420         ret = smsc95xx_wait_eeprom(dev);
 421         if (ret < 0)
 422                 return ret;
 423
 424         for (i = 0; i < length; i++) {
 425
 426                 /* Fill data register */
 427                 val = data[i];
 428                 ret = smsc95xx_write_reg(dev, E2P_DATA, val);
 429                 if (ret < 0) {
 430                         netdev_warn(dev->net, "Error writing E2P_DATA\n");
 431                         return ret;
 432                 }
 433
 434                 /* Send "write" command */
 435                 val = E2P_CMD_BUSY_ | E2P_CMD_WRITE_ | (offset & E2P_CMD_ADDR_);
 436                 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 437                 if (ret < 0) {
 438                         netdev_warn(dev->net, "Error writing E2P_CMD\n");
 439                         return ret;
 440                 }
 441
 442                 ret = smsc95xx_wait_eeprom(dev);
 443                 if (ret < 0)
 444                         return ret;
 445
 446                 offset++;
 447         }
 448
 449         return 0;
 450 }
 451
 452 static int __must_check smsc95xx_write_reg_async(struct usbnet *dev, u16 index,
 453                                                  u32 data)
 454 {
 455         const u16 size = 4;
 456         u32 buf;
 457         int ret;
 458
 459         buf = data;
 460         cpu_to_le32s(&buf);
 461
 462         ret = usbnet_write_cmd_async(dev, USB_VENDOR_REQUEST_WRITE_REGISTER,
 463                                      USB_DIR_OUT | USB_TYPE_VENDOR |
 464                                      USB_RECIP_DEVICE,
 465                                      0, index, &buf, size);
 466         if (ret < 0)
 467                 netdev_warn(dev->net, "Error write async cmd, sts=%d\n",
 468                             ret);
 469         return ret;
 470 }
 471
 472 /* returns hash bit number for given MAC address
 473  * example:
 474  * 01 00 5E 00 00 01 -> returns bit number 31 */
 475 static unsigned int smsc95xx_hash(char addr[ETH_ALEN])
 476 {
 477         return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
 478 }
 479
 480 static void smsc95xx_set_multicast(struct net_device *netdev)
 481 {
 482         struct usbnet *dev = netdev_priv(netdev);
 483         struct smsc95xx_priv *pdata = dev->driver_priv;
 484         unsigned long flags;
 485         int ret;
 486
 487         pdata->hash_hi = 0;
 488         pdata->hash_lo = 0;
 489
 490         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 491
 492         if (dev->net->flags & IFF_PROMISC) {
 493                 netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
 494                 pdata->mac_cr |= MAC_CR_PRMS_;
 495                 pdata->mac_cr &= ~(MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 496         } else if (dev->net->flags & IFF_ALLMULTI) {
 497                 netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
 498                 pdata->mac_cr |= MAC_CR_MCPAS_;
 499                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_HPFILT_);
 500         } else if (!netdev_mc_empty(dev->net)) {
 501                 struct netdev_hw_addr *ha;
 502
 503                 pdata->mac_cr |= MAC_CR_HPFILT_;
 504                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);
 505
 506                 netdev_for_each_mc_addr(ha, netdev) {
 507                         u32 bitnum = smsc95xx_hash(ha->addr);
 508                         u32 mask = 0x01 << (bitnum & 0x1F);
 509                         if (bitnum & 0x20)
 510                                 pdata->hash_hi |= mask;
 511                         else
 512                                 pdata->hash_lo |= mask;
 513                 }
 514
 515                 netif_dbg(dev, drv, dev->net, "HASHH=0x%08X, HASHL=0x%08X\n",
 516                                    pdata->hash_hi, pdata->hash_lo);
 517         } else {
 518                 netif_dbg(dev, drv, dev->net, "receive own packets only\n");
 519                 pdata->mac_cr &=
 520                         ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 521         }
 522
 523         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 524
 525         /* Initiate async writes, as we can't wait for completion here */
 526         ret = smsc95xx_write_reg_async(dev, HASHH, pdata->hash_hi);
 527         if (ret < 0)
 528                 netdev_warn(dev->net, "failed to initiate async write to HASHH\n");
 529
 530         ret = smsc95xx_write_reg_async(dev, HASHL, pdata->hash_lo);
 531         if (ret < 0)
 532                 netdev_warn(dev->net, "failed to initiate async write to HASHL\n");
 533
 534         ret = smsc95xx_write_reg_async(dev, MAC_CR, pdata->mac_cr);
 535         if (ret < 0)
 536                 netdev_warn(dev->net, "failed to initiate async write to MAC_CR\n");
 537 }
 538
 539 static int smsc95xx_phy_update_flowcontrol(struct usbnet *dev)
 540 {
 541         u32 flow = 0, afc_cfg;
 542         struct smsc95xx_priv *pdata = dev->driver_priv;
 543         bool tx_pause, rx_pause;
 544
 545         int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
 546         if (ret < 0)
 547                 return ret;
 548
 549         if (pdata->phydev->duplex == DUPLEX_FULL) {
 550                 phy_get_pause(pdata->phydev, &tx_pause, &rx_pause);
 551
 552                 if (rx_pause)
 553                         flow = 0xFFFF0002;
 554
 555                 if (tx_pause) {
 556                         afc_cfg |= 0xF;
 557                         flow |= 0xFFFF0000;
 558                 } else {
 559                         afc_cfg &= ~0xF;
 560                 }
 561
 562                 netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
 563                           rx_pause ? "enabled" : "disabled",
 564                           tx_pause ? "enabled" : "disabled");
 565         } else {
 566                 netif_dbg(dev, link, dev->net, "half duplex\n");
 567                 afc_cfg |= 0xF;
 568         }
 569
 570         ret = smsc95xx_write_reg(dev, FLOW, flow);
 571         if (ret < 0)
 572                 return ret;
 573
 574         return smsc95xx_write_reg(dev, AFC_CFG, afc_cfg);
 575 }
 576
 577 static void smsc95xx_mac_update_fullduplex(struct usbnet *dev)
 578 {
 579         struct smsc95xx_priv *pdata = dev->driver_priv;
 580         unsigned long flags;
 581         int ret;
 582
 583         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 584         if (pdata->phydev->duplex != DUPLEX_FULL) {
 585                 pdata->mac_cr &= ~MAC_CR_FDPX_;
 586                 pdata->mac_cr |= MAC_CR_RCVOWN_;
 587         } else {
 588                 pdata->mac_cr &= ~MAC_CR_RCVOWN_;
 589                 pdata->mac_cr |= MAC_CR_FDPX_;
 590         }
 591         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 592
 593         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 594         if (ret < 0) {
 595                 if (ret != -ENODEV)
 596                         netdev_warn(dev->net,
 597                                     "Error updating MAC full duplex mode\n");
 598                 return;
 599         }
 600
 601         ret = smsc95xx_phy_update_flowcontrol(dev);
 602         if (ret < 0)
 603                 netdev_warn(dev->net, "Error updating PHY flow control\n");
 604 }
 605
 606 static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
 607 {
 608         struct smsc95xx_priv *pdata = dev->driver_priv;
 609         unsigned long flags;
 610         u32 intdata;
 611
 612         if (urb->actual_length != 4) {
 613                 netdev_warn(dev->net, "unexpected urb length %d\n",
 614                             urb->actual_length);
 615                 return;
 616         }
 617
 618         intdata = get_unaligned_le32(urb->transfer_buffer);
 619         netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
 620
 621         local_irq_save(flags);
 622
 623         if (intdata & INT_ENP_PHY_INT_)
 624                 generic_handle_domain_irq(pdata->irqdomain, PHY_HWIRQ);
 625         else
 626                 netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
 627                             intdata);
 628
 629         local_irq_restore(flags);
 630 }
 631
 632 /* Enable or disable Tx & Rx checksum offload engines */
 633 static int smsc95xx_set_features(struct net_device *netdev,
 634         netdev_features_t features)
 635 {
 636         struct usbnet *dev = netdev_priv(netdev);
 637         u32 read_buf;
 638         int ret;
 639
 640         ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
 641         if (ret < 0)
 642                 return ret;
 643
 644         if (features & NETIF_F_IP_CSUM)
 645                 read_buf |= Tx_COE_EN_;
 646         else
 647                 read_buf &= ~Tx_COE_EN_;
 648
 649         if (features & NETIF_F_RXCSUM)
 650                 read_buf |= Rx_COE_EN_;
 651         else
 652                 read_buf &= ~Rx_COE_EN_;
 653
 654         ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
 655         if (ret < 0)
 656                 return ret;
 657
 658         netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
 659         return 0;
 660 }
 661
 662 static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
 663 {
 664         return MAX_EEPROM_SIZE;
 665 }
 666
 667 static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
 668                                        struct ethtool_eeprom *ee, u8 *data)
 669 {
 670         struct usbnet *dev = netdev_priv(netdev);
 671
 672         ee->magic = LAN95XX_EEPROM_MAGIC;
 673
 674         return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
 675 }
 676
 677 static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
 678                                        struct ethtool_eeprom *ee, u8 *data)
 679 {
 680         struct usbnet *dev = netdev_priv(netdev);
 681
 682         if (ee->magic != LAN95XX_EEPROM_MAGIC) {
 683                 netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
 684                             ee->magic);
 685                 return -EINVAL;
 686         }
 687
 688         return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
 689 }
 690
 691 static int smsc95xx_ethtool_getregslen(struct net_device *netdev)
 692 {
 693         /* all smsc95xx registers */
 694         return COE_CR - ID_REV + sizeof(u32);
 695 }
 696
 697 static void
 698 smsc95xx_ethtool_getregs(struct net_device *netdev, struct ethtool_regs *regs,
 699                          void *buf)
 700 {
 701         struct usbnet *dev = netdev_priv(netdev);
 702         unsigned int i, j;
 703         int retval;
 704         u32 *data = buf;
 705
 706         retval = smsc95xx_read_reg(dev, ID_REV, &regs->version);
 707         if (retval < 0) {
 708                 netdev_warn(netdev, "REGS: cannot read ID_REV\n");
 709                 return;
 710         }
 711
 712         for (i = ID_REV, j = 0; i <= COE_CR; i += (sizeof(u32)), j++) {
 713                 retval = smsc95xx_read_reg(dev, i, &data[j]);
 714                 if (retval < 0) {
 715                         netdev_warn(netdev, "REGS: cannot read reg[%x]\n", i);
 716                         return;
 717                 }
 718         }
 719 }
 720
 721 static void smsc95xx_ethtool_get_wol(struct net_device *net,
 722                                      struct ethtool_wolinfo *wolinfo)
 723 {
 724         struct usbnet *dev = netdev_priv(net);
 725         struct smsc95xx_priv *pdata = dev->driver_priv;
 726
 727         wolinfo->supported = SUPPORTED_WAKE;
 728         wolinfo->wolopts = pdata->wolopts;
 729 }
 730
 731 static int smsc95xx_ethtool_set_wol(struct net_device *net,
 732                                     struct ethtool_wolinfo *wolinfo)
 733 {
 734         struct usbnet *dev = netdev_priv(net);
 735         struct smsc95xx_priv *pdata = dev->driver_priv;
 736         int ret;
 737
 738         if (wolinfo->wolopts & ~SUPPORTED_WAKE)
 739                 return -EINVAL;
 740
 741         pdata->wolopts = wolinfo->wolopts & SUPPORTED_WAKE;
 742
 743         ret = device_set_wakeup_enable(&dev->udev->dev, pdata->wolopts);
 744         if (ret < 0)
 745                 netdev_warn(dev->net, "device_set_wakeup_enable error %d\n", ret);
 746
 747         return ret;
 748 }
 749
 750 static u32 smsc95xx_get_link(struct net_device *net)
 751 {
 752         phy_read_status(net->phydev);
 753         return net->phydev->link;
 754 }
 755
 756 static void smsc95xx_ethtool_get_strings(struct net_device *netdev, u32 sset,
 757                                         u8 *data)
 758 {
 759         switch (sset) {
 760         case ETH_SS_TEST:
 761                 net_selftest_get_strings(data);
 762                 break;
 763         }
 764 }
 765
 766 static int smsc95xx_ethtool_get_sset_count(struct net_device *ndev, int sset)
 767 {
 768         switch (sset) {
 769         case ETH_SS_TEST:
 770                 return net_selftest_get_count();
 771         default:
 772                 return -EOPNOTSUPP;
 773         }
 774 }
 775
 776 static const struct ethtool_ops smsc95xx_ethtool_ops = {
 777         .get_link       = smsc95xx_get_link,
 778         .nway_reset     = phy_ethtool_nway_reset,
 779         .get_drvinfo    = usbnet_get_drvinfo,
 780         .get_msglevel   = usbnet_get_msglevel,
 781         .set_msglevel   = usbnet_set_msglevel,
 782         .get_eeprom_len = smsc95xx_ethtool_get_eeprom_len,
 783         .get_eeprom     = smsc95xx_ethtool_get_eeprom,
 784         .set_eeprom     = smsc95xx_ethtool_set_eeprom,
 785         .get_regs_len   = smsc95xx_ethtool_getregslen,
 786         .get_regs       = smsc95xx_ethtool_getregs,
 787         .get_wol        = smsc95xx_ethtool_get_wol,
 788         .set_wol        = smsc95xx_ethtool_set_wol,
 789         .get_link_ksettings     = phy_ethtool_get_link_ksettings,
 790         .set_link_ksettings     = phy_ethtool_set_link_ksettings,
 791         .get_ts_info    = ethtool_op_get_ts_info,
 792         .self_test      = net_selftest,
 793         .get_strings    = smsc95xx_ethtool_get_strings,
 794         .get_sset_count = smsc95xx_ethtool_get_sset_count,
 795 };
 796
 797 static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
 798 {
 799         if (!netif_running(netdev))
 800                 return -EINVAL;
 801
 802         return phy_mii_ioctl(netdev->phydev, rq, cmd);
 803 }
 804
 805 static void smsc95xx_init_mac_address(struct usbnet *dev)
 806 {
 807         u8 addr[ETH_ALEN];
 808
 809         /* maybe the boot loader passed the MAC address in devicetree */
 810         if (!platform_get_ethdev_address(&dev->udev->dev, dev->net)) {
 811                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 812                         /* device tree values are valid so use them */
 813                         netif_dbg(dev, ifup, dev->net, "MAC address read from the device tree\n");
 814                         return;
 815                 }
 816         }
 817
 818         /* try reading mac address from EEPROM */
 819         if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN, addr) == 0) {
 820                 eth_hw_addr_set(dev->net, addr);
 821                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 822                         /* eeprom values are valid so use them */
 823                         netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
 824                         return;
 825                 }
 826         }
 827
 828         /* no useful static MAC address found. generate a random one */
 829         eth_hw_addr_random(dev->net);
 830         netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
 831 }
 832
 833 static int smsc95xx_set_mac_address(struct usbnet *dev)
 834 {
 835         u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
 836                 dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
 837         u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
 838         int ret;
 839
 840         ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
 841         if (ret < 0)
 842                 return ret;
 843
 844         return smsc95xx_write_reg(dev, ADDRH, addr_hi);
 845 }
 846
 847 /* starts the TX path */
 848 static int smsc95xx_start_tx_path(struct usbnet *dev)
 849 {
 850         struct smsc95xx_priv *pdata = dev->driver_priv;
 851         unsigned long flags;
 852         int ret;
 853
 854         /* Enable Tx at MAC */
 855         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 856         pdata->mac_cr |= MAC_CR_TXEN_;
 857         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 858
 859         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 860         if (ret < 0)
 861                 return ret;
 862
 863         /* Enable Tx at SCSRs */
 864         return smsc95xx_write_reg(dev, TX_CFG, TX_CFG_ON_);
 865 }
 866
 867 /* Starts the Receive path */
 868 static int smsc95xx_start_rx_path(struct usbnet *dev, int in_pm)
 869 {
 870         struct smsc95xx_priv *pdata = dev->driver_priv;
 871         unsigned long flags;
 872
 873         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 874         pdata->mac_cr |= MAC_CR_RXEN_;
 875         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 876
 877         return __smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr, in_pm);
 878 }
 879
 880 static int smsc95xx_reset(struct usbnet *dev)
 881 {
 882         struct smsc95xx_priv *pdata = dev->driver_priv;
 883         u32 read_buf, write_buf, burst_cap;
 884         int ret = 0, timeout;
 885
 886         netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
 887
 888         ret = smsc95xx_write_reg(dev, HW_CFG, HW_CFG_LRST_);
 889         if (ret < 0)
 890                 return ret;
 891
 892         timeout = 0;
 893         do {
 894                 msleep(10);
 895                 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 896                 if (ret < 0)
 897                         return ret;
 898                 timeout++;
 899         } while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
 900
 901         if (timeout >= 100) {
 902                 netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
 903                 return ret;
 904         }
 905
 906         ret = smsc95xx_set_mac_address(dev);
 907         if (ret < 0)
 908                 return ret;
 909
 910         netif_dbg(dev, ifup, dev->net, "MAC Address: %pM\n",
 911                   dev->net->dev_addr);
 912
 913         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 914         if (ret < 0)
 915                 return ret;
 916
 917         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x\n",
 918                   read_buf);
 919
 920         read_buf |= HW_CFG_BIR_;
 921
 922         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 923         if (ret < 0)
 924                 return ret;
 925
 926         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 927         if (ret < 0)
 928                 return ret;
 929
 930         netif_dbg(dev, ifup, dev->net,
 931                   "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
 932                   read_buf);
 933
 934         if (!turbo_mode) {
 935                 burst_cap = 0;
 936                 dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
 937         } else if (dev->udev->speed == USB_SPEED_HIGH) {
 938                 burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
 939                 dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
 940         } else {
 941                 burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
 942                 dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
 943         }
 944
 945         netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld\n",
 946                   (ulong)dev->rx_urb_size);
 947
 948         ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
 949         if (ret < 0)
 950                 return ret;
 951
 952         ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
 953         if (ret < 0)
 954                 return ret;
 955
 956         netif_dbg(dev, ifup, dev->net,
 957                   "Read Value from BURST_CAP after writing: 0x%08x\n",
 958                   read_buf);
 959
 960         ret = smsc95xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
 961         if (ret < 0)
 962                 return ret;
 963
 964         ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
 965         if (ret < 0)
 966                 return ret;
 967
 968         netif_dbg(dev, ifup, dev->net,
 969                   "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
 970                   read_buf);
 971
 972         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 973         if (ret < 0)
 974                 return ret;
 975
 976         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG: 0x%08x\n",
 977                   read_buf);
 978
 979         if (turbo_mode)
 980                 read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
 981
 982         read_buf &= ~HW_CFG_RXDOFF_;
 983
 984         /* set Rx data offset=2, Make IP header aligns on word boundary. */
 985         read_buf |= NET_IP_ALIGN << 9;
 986
 987         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 988         if (ret < 0)
 989                 return ret;
 990
 991         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 992         if (ret < 0)
 993                 return ret;
 994
 995         netif_dbg(dev, ifup, dev->net,
 996                   "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
 997
 998         ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
 999         if (ret < 0)
1000                 return ret;
1001
1002         ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
1003         if (ret < 0)
1004                 return ret;
1005         netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
1006
1007         /* Configure GPIO pins as LED outputs */
1008         write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
1009                 LED_GPIO_CFG_FDX_LED;
1010         ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
1011         if (ret < 0)
1012                 return ret;
1013
1014         /* Init Tx */
1015         ret = smsc95xx_write_reg(dev, FLOW, 0);
1016         if (ret < 0)
1017                 return ret;
1018
1019         ret = smsc95xx_write_reg(dev, AFC_CFG, AFC_CFG_DEFAULT);
1020         if (ret < 0)
1021                 return ret;
1022
1023         /* Don't need mac_cr_lock during initialisation */
1024         ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
1025         if (ret < 0)
1026                 return ret;
1027
1028         /* Init Rx */
1029         /* Set Vlan */
1030         ret = smsc95xx_write_reg(dev, VLAN1, (u32)ETH_P_8021Q);
1031         if (ret < 0)
1032                 return ret;
1033
1034         /* Enable or disable checksum offload engines */
1035         ret = smsc95xx_set_features(dev->net, dev->net->features);
1036         if (ret < 0) {
1037                 netdev_warn(dev->net, "Failed to set checksum offload features\n");
1038                 return ret;
1039         }
1040
1041         smsc95xx_set_multicast(dev->net);
1042
1043         ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
1044         if (ret < 0)
1045                 return ret;
1046
1047         /* enable PHY interrupts */
1048         read_buf |= INT_EP_CTL_PHY_INT_;
1049
1050         ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
1051         if (ret < 0)
1052                 return ret;
1053
1054         ret = smsc95xx_start_tx_path(dev);
1055         if (ret < 0) {
1056                 netdev_warn(dev->net, "Failed to start TX path\n");
1057                 return ret;
1058         }
1059
1060         ret = smsc95xx_start_rx_path(dev, 0);
1061         if (ret < 0) {
1062                 netdev_warn(dev->net, "Failed to start RX path\n");
1063                 return ret;
1064         }
1065
1066         netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1067         return 0;
1068 }
1069
1070 static const struct net_device_ops smsc95xx_netdev_ops = {
1071         .ndo_open               = usbnet_open,
1072         .ndo_stop               = usbnet_stop,
1073         .ndo_start_xmit         = usbnet_start_xmit,
1074         .ndo_tx_timeout         = usbnet_tx_timeout,
1075         .ndo_change_mtu         = usbnet_change_mtu,
1076         .ndo_get_stats64        = dev_get_tstats64,
1077         .ndo_set_mac_address    = eth_mac_addr,
1078         .ndo_validate_addr      = eth_validate_addr,
1079         .ndo_eth_ioctl          = smsc95xx_ioctl,
1080         .ndo_set_rx_mode        = smsc95xx_set_multicast,
1081         .ndo_set_features       = smsc95xx_set_features,
1082 };
1083
1084 static void smsc95xx_handle_link_change(struct net_device *net)
1085 {
1086         struct usbnet *dev = netdev_priv(net);
1087
1088         phy_print_status(net->phydev);
1089         smsc95xx_mac_update_fullduplex(dev);
1090         usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1091 }
1092
1093 static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1094 {
1095         struct smsc95xx_priv *pdata;
1096         bool is_internal_phy;
1097         char usb_path[64];
1098         int ret, phy_irq;
1099         u32 val;
1100
1101         printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1102
1103         ret = usbnet_get_endpoints(dev, intf);
1104         if (ret < 0) {
1105                 netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1106                 return ret;
1107         }
1108
1109         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
1110         if (!pdata)
1111                 return -ENOMEM;
1112
1113         dev->driver_priv = pdata;
1114
1115         spin_lock_init(&pdata->mac_cr_lock);
1116
1117         /* LAN95xx devices do not alter the computed checksum of 0 to 0xffff.
1118          * RFC 2460, ipv6 UDP calculated checksum yields a result of zero must
1119          * be changed to 0xffff. RFC 768, ipv4 UDP computed checksum is zero,
1120          * it is transmitted as all ones. The zero transmitted checksum means
1121          * transmitter generated no checksum. Hence, enable csum offload only
1122          * for ipv4 packets.
1123          */
1124         if (DEFAULT_TX_CSUM_ENABLE)
1125                 dev->net->features |= NETIF_F_IP_CSUM;
1126         if (DEFAULT_RX_CSUM_ENABLE)
1127                 dev->net->features |= NETIF_F_RXCSUM;
1128
1129         dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1130         set_bit(EVENT_NO_IP_ALIGN, &dev->flags);
1131
1132         smsc95xx_init_mac_address(dev);
1133
1134         /* Init all registers */
1135         ret = smsc95xx_reset(dev);
1136         if (ret)
1137                 goto free_pdata;
1138
1139         /* create irq domain for use by PHY driver and GPIO consumers */
1140         usb_make_path(dev->udev, usb_path, sizeof(usb_path));
1141         pdata->irqfwnode = irq_domain_alloc_named_fwnode(usb_path);
1142         if (!pdata->irqfwnode) {
1143                 ret = -ENOMEM;
1144                 goto free_pdata;
1145         }
1146
1147         pdata->irqdomain = irq_domain_create_linear(pdata->irqfwnode,
1148                                                     SMSC95XX_NR_IRQS,
1149                                                     &irq_domain_simple_ops,
1150                                                     pdata);
1151         if (!pdata->irqdomain) {
1152                 ret = -ENOMEM;
1153                 goto free_irqfwnode;
1154         }
1155
1156         phy_irq = irq_create_mapping(pdata->irqdomain, PHY_HWIRQ);
1157         if (!phy_irq) {
1158                 ret = -ENOENT;
1159                 goto remove_irqdomain;
1160         }
1161
1162         pdata->irqchip = dummy_irq_chip;
1163         pdata->irqchip.name = SMSC_CHIPNAME;
1164         irq_set_chip_and_handler_name(phy_irq, &pdata->irqchip,
1165                                       handle_simple_irq, "phy");
1166
1167         pdata->mdiobus = mdiobus_alloc();
1168         if (!pdata->mdiobus) {
1169                 ret = -ENOMEM;
1170                 goto dispose_irq;
1171         }
1172
1173         ret = smsc95xx_read_reg(dev, HW_CFG, &val);
1174         if (ret < 0)
1175                 goto free_mdio;
1176
1177         is_internal_phy = !(val & HW_CFG_PSEL_);
1178         if (is_internal_phy)
1179                 pdata->mdiobus->phy_mask = ~(1u << SMSC95XX_INTERNAL_PHY_ID);
1180
1181         pdata->mdiobus->priv = dev;
1182         pdata->mdiobus->read = smsc95xx_mdiobus_read;
1183         pdata->mdiobus->write = smsc95xx_mdiobus_write;
1184         pdata->mdiobus->name = "smsc95xx-mdiobus";
1185         pdata->mdiobus->parent = &dev->udev->dev;
1186
1187         snprintf(pdata->mdiobus->id, ARRAY_SIZE(pdata->mdiobus->id),
1188                  "usb-%03d:%03d", dev->udev->bus->busnum, dev->udev->devnum);
1189
1190         ret = mdiobus_register(pdata->mdiobus);
1191         if (ret) {
1192                 netdev_err(dev->net, "Could not register MDIO bus\n");
1193                 goto free_mdio;
1194         }
1195
1196         pdata->phydev = phy_find_first(pdata->mdiobus);
1197         if (!pdata->phydev) {
1198                 netdev_err(dev->net, "no PHY found\n");
1199                 ret = -ENODEV;
1200                 goto unregister_mdio;
1201         }
1202
1203         pdata->phydev->irq = phy_irq;
1204         pdata->phydev->is_internal = is_internal_phy;
1205
1206         /* detect device revision as different features may be available */
1207         ret = smsc95xx_read_reg(dev, ID_REV, &val);
1208         if (ret < 0)
1209                 goto unregister_mdio;
1210
1211         val >>= 16;
1212         if ((val == ID_REV_CHIP_ID_9500A_) || (val == ID_REV_CHIP_ID_9530_) ||
1213             (val == ID_REV_CHIP_ID_89530_) || (val == ID_REV_CHIP_ID_9730_))
1214                 pdata->features = (FEATURE_8_WAKEUP_FILTERS |
1215                         FEATURE_PHY_NLP_CROSSOVER |
1216                         FEATURE_REMOTE_WAKEUP);
1217         else if (val == ID_REV_CHIP_ID_9512_)
1218                 pdata->features = FEATURE_8_WAKEUP_FILTERS;
1219
1220         dev->net->netdev_ops = &smsc95xx_netdev_ops;
1221         dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1222         dev->net->flags |= IFF_MULTICAST;
1223         dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
1224         dev->net->min_mtu = ETH_MIN_MTU;
1225         dev->net->max_mtu = ETH_DATA_LEN;
1226         dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
1227
1228         ret = phy_connect_direct(dev->net, pdata->phydev,
1229                                  &smsc95xx_handle_link_change,
1230                                  PHY_INTERFACE_MODE_MII);
1231         if (ret) {
1232                 netdev_err(dev->net, "can't attach PHY to %s\n", pdata->mdiobus->id);
1233                 goto unregister_mdio;
1234         }
1235
1236         phy_attached_info(dev->net->phydev);
1237
1238         return 0;
1239
1240 unregister_mdio:
1241         mdiobus_unregister(pdata->mdiobus);
1242
1243 free_mdio:
1244         mdiobus_free(pdata->mdiobus);
1245
1246 dispose_irq:
1247         irq_dispose_mapping(phy_irq);
1248
1249 remove_irqdomain:
1250         irq_domain_remove(pdata->irqdomain);
1251
1252 free_irqfwnode:
1253         irq_domain_free_fwnode(pdata->irqfwnode);
1254
1255 free_pdata:
1256         kfree(pdata);
1257         return ret;
1258 }
1259
1260 static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1261 {
1262         struct smsc95xx_priv *pdata = dev->driver_priv;
1263
1264         phy_disconnect(dev->net->phydev);
1265         mdiobus_unregister(pdata->mdiobus);
1266         mdiobus_free(pdata->mdiobus);
1267         irq_dispose_mapping(irq_find_mapping(pdata->irqdomain, PHY_HWIRQ));
1268         irq_domain_remove(pdata->irqdomain);
1269         irq_domain_free_fwnode(pdata->irqfwnode);
1270         netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1271         kfree(pdata);
1272 }
1273
1274 static int smsc95xx_start_phy(struct usbnet *dev)
1275 {
1276         phy_start(dev->net->phydev);
1277
1278         return 0;
1279 }
1280
1281 static int smsc95xx_stop(struct usbnet *dev)
1282 {
1283         phy_stop(dev->net->phydev);
1284
1285         return 0;
1286 }
1287
1288 static u32 smsc_crc(const u8 *buffer, size_t len, int filter)
1289 {
1290         u32 crc = bitrev16(crc16(0xFFFF, buffer, len));
1291         return crc << ((filter % 2) * 16);
1292 }
1293
1294 static int smsc95xx_link_ok_nopm(struct usbnet *dev)
1295 {
1296         int ret;
1297
1298         /* first, a dummy read, needed to latch some MII phys */
1299         ret = smsc95xx_mdio_read_nopm(dev, MII_BMSR);
1300         if (ret < 0)
1301                 return ret;
1302
1303         ret = smsc95xx_mdio_read_nopm(dev, MII_BMSR);
1304         if (ret < 0)
1305                 return ret;
1306
1307         return !!(ret & BMSR_LSTATUS);
1308 }
1309
1310 static int smsc95xx_enter_suspend0(struct usbnet *dev)
1311 {
1312         struct smsc95xx_priv *pdata = dev->driver_priv;
1313         u32 val;
1314         int ret;
1315
1316         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1317         if (ret < 0)
1318                 return ret;
1319
1320         val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
1321         val |= PM_CTL_SUS_MODE_0;
1322
1323         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1324         if (ret < 0)
1325                 return ret;
1326
1327         /* clear wol status */
1328         val &= ~PM_CTL_WUPS_;
1329         val |= PM_CTL_WUPS_WOL_;
1330
1331         /* enable energy detection */
1332         if (pdata->wolopts & WAKE_PHY)
1333                 val |= PM_CTL_WUPS_ED_;
1334
1335         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1336         if (ret < 0)
1337                 return ret;
1338
1339         /* read back PM_CTRL */
1340         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1341         if (ret < 0)
1342                 return ret;
1343
1344         pdata->suspend_flags |= SUSPEND_SUSPEND0;
1345
1346         return 0;
1347 }
1348
1349 static int smsc95xx_enter_suspend1(struct usbnet *dev)
1350 {
1351         struct smsc95xx_priv *pdata = dev->driver_priv;
1352         u32 val;
1353         int ret;
1354
1355         /* reconfigure link pulse detection timing for
1356          * compatibility with non-standard link partners
1357          */
1358         if (pdata->features & FEATURE_PHY_NLP_CROSSOVER)
1359                 smsc95xx_mdio_write_nopm(dev, PHY_EDPD_CONFIG,
1360                                          PHY_EDPD_CONFIG_DEFAULT);
1361
1362         /* enable energy detect power-down mode */
1363         ret = smsc95xx_mdio_read_nopm(dev, PHY_MODE_CTRL_STS);
1364         if (ret < 0)
1365                 return ret;
1366
1367         ret |= MODE_CTRL_STS_EDPWRDOWN_;
1368
1369         smsc95xx_mdio_write_nopm(dev, PHY_MODE_CTRL_STS, ret);
1370
1371         /* enter SUSPEND1 mode */
1372         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1373         if (ret < 0)
1374                 return ret;
1375
1376         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1377         val |= PM_CTL_SUS_MODE_1;
1378
1379         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1380         if (ret < 0)
1381                 return ret;
1382
1383         /* clear wol status, enable energy detection */
1384         val &= ~PM_CTL_WUPS_;
1385         val |= (PM_CTL_WUPS_ED_ | PM_CTL_ED_EN_);
1386
1387         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1388         if (ret < 0)
1389                 return ret;
1390
1391         pdata->suspend_flags |= SUSPEND_SUSPEND1;
1392
1393         return 0;
1394 }
1395
1396 static int smsc95xx_enter_suspend2(struct usbnet *dev)
1397 {
1398         struct smsc95xx_priv *pdata = dev->driver_priv;
1399         u32 val;
1400         int ret;
1401
1402         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1403         if (ret < 0)
1404                 return ret;
1405
1406         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1407         val |= PM_CTL_SUS_MODE_2;
1408
1409         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1410         if (ret < 0)
1411                 return ret;
1412
1413         pdata->suspend_flags |= SUSPEND_SUSPEND2;
1414
1415         return 0;
1416 }
1417
1418 static int smsc95xx_enter_suspend3(struct usbnet *dev)
1419 {
1420         struct smsc95xx_priv *pdata = dev->driver_priv;
1421         u32 val;
1422         int ret;
1423
1424         ret = smsc95xx_read_reg_nopm(dev, RX_FIFO_INF, &val);
1425         if (ret < 0)
1426                 return ret;
1427
1428         if (val & RX_FIFO_INF_USED_) {
1429                 netdev_info(dev->net, "rx fifo not empty in autosuspend\n");
1430                 return -EBUSY;
1431         }
1432
1433         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1434         if (ret < 0)
1435                 return ret;
1436
1437         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1438         val |= PM_CTL_SUS_MODE_3 | PM_CTL_RES_CLR_WKP_STS;
1439
1440         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1441         if (ret < 0)
1442                 return ret;
1443
1444         /* clear wol status */
1445         val &= ~PM_CTL_WUPS_;
1446         val |= PM_CTL_WUPS_WOL_;
1447
1448         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1449         if (ret < 0)
1450                 return ret;
1451
1452         pdata->suspend_flags |= SUSPEND_SUSPEND3;
1453
1454         return 0;
1455 }
1456
1457 static int smsc95xx_autosuspend(struct usbnet *dev, u32 link_up)
1458 {
1459         struct smsc95xx_priv *pdata = dev->driver_priv;
1460
1461         if (!netif_running(dev->net)) {
1462                 /* interface is ifconfig down so fully power down hw */
1463                 netdev_dbg(dev->net, "autosuspend entering SUSPEND2\n");
1464                 return smsc95xx_enter_suspend2(dev);
1465         }
1466
1467         if (!link_up) {
1468                 /* link is down so enter EDPD mode, but only if device can
1469                  * reliably resume from it.  This check should be redundant
1470                  * as current FEATURE_REMOTE_WAKEUP parts also support
1471                  * FEATURE_PHY_NLP_CROSSOVER but it's included for clarity */
1472                 if (!(pdata->features & FEATURE_PHY_NLP_CROSSOVER)) {
1473                         netdev_warn(dev->net, "EDPD not supported\n");
1474                         return -EBUSY;
1475                 }
1476
1477                 netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n");
1478                 netdev_info(dev->net, "entering SUSPEND1 mode\n");
1479                 return smsc95xx_enter_suspend1(dev);
1480         }
1481
1482         netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n");
1483         return smsc95xx_enter_suspend3(dev);
1484 }
1485
1486 static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
1487 {
1488         struct usbnet *dev = usb_get_intfdata(intf);
1489         struct smsc95xx_priv *pdata = dev->driver_priv;
1490         u32 val, link_up;
1491         int ret;
1492
1493         ret = usbnet_suspend(intf, message);
1494         if (ret < 0) {
1495                 netdev_warn(dev->net, "usbnet_suspend error\n");
1496                 return ret;
1497         }
1498
1499         if (pdata->suspend_flags) {
1500                 netdev_warn(dev->net, "error during last resume\n");
1501                 pdata->suspend_flags = 0;
1502         }
1503
1504         /* determine if link is up using only _nopm functions */
1505         link_up = smsc95xx_link_ok_nopm(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_nopm(dev, WUCSR, &val);
1523                 if (ret < 0)
1524                         goto done;
1525
1526                 val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
1527
1528                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1529                 if (ret < 0)
1530                         goto done;
1531
1532                 ret = smsc95xx_read_reg_nopm(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_nopm(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_nopm(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_nopm(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_nopm(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_nopm(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_nopm(dev, WUCSR, &val);
1657                 if (ret < 0)
1658                         goto done;
1659
1660                 val |= WUCSR_WUFR_;
1661
1662                 ret = smsc95xx_write_reg_nopm(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_nopm(dev, WUCSR, &val);
1670                 if (ret < 0)
1671                         goto done;
1672
1673                 val |= WUCSR_MPR_;
1674
1675                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1676                 if (ret < 0)
1677                         goto done;
1678         }
1679
1680         /* enable/disable wakeup sources */
1681         ret = smsc95xx_read_reg_nopm(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_nopm(dev, WUCSR, val);
1702         if (ret < 0)
1703                 goto done;
1704
1705         /* enable wol wakeup source */
1706         ret = smsc95xx_read_reg_nopm(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_nopm(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, 1);
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         return ret;
1736 }
1737
1738 static int smsc95xx_resume(struct usb_interface *intf)
1739 {
1740         struct usbnet *dev = usb_get_intfdata(intf);
1741         struct smsc95xx_priv *pdata;
1742         u8 suspend_flags;
1743         int ret;
1744         u32 val;
1745
1746         BUG_ON(!dev);
1747         pdata = dev->driver_priv;
1748         suspend_flags = pdata->suspend_flags;
1749
1750         netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags);
1751
1752         /* do this first to ensure it's cleared even in error case */
1753         pdata->suspend_flags = 0;
1754
1755         if (suspend_flags & SUSPEND_ALLMODES) {
1756                 /* clear wake-up sources */
1757                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1758                 if (ret < 0)
1759                         return ret;
1760
1761                 val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
1762
1763                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1764                 if (ret < 0)
1765                         return ret;
1766
1767                 /* clear wake-up status */
1768                 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1769                 if (ret < 0)
1770                         return ret;
1771
1772                 val &= ~PM_CTL_WOL_EN_;
1773                 val |= PM_CTL_WUPS_;
1774
1775                 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1776                 if (ret < 0)
1777                         return ret;
1778         }
1779
1780         phy_init_hw(pdata->phydev);
1781
1782         ret = usbnet_resume(intf);
1783         if (ret < 0)
1784                 netdev_warn(dev->net, "usbnet_resume error\n");
1785
1786         return ret;
1787 }
1788
1789 static int smsc95xx_reset_resume(struct usb_interface *intf)
1790 {
1791         struct usbnet *dev = usb_get_intfdata(intf);
1792         int ret;
1793
1794         ret = smsc95xx_reset(dev);
1795         if (ret < 0)
1796                 return ret;
1797
1798         return smsc95xx_resume(intf);
1799 }
1800
1801 static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1802 {
1803         skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
1804         skb->ip_summed = CHECKSUM_COMPLETE;
1805         skb_trim(skb, skb->len - 2);
1806 }
1807
1808 static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1809 {
1810         /* This check is no longer done by usbnet */
1811         if (skb->len < dev->net->hard_header_len)
1812                 return 0;
1813
1814         while (skb->len > 0) {
1815                 u32 header, align_count;
1816                 struct sk_buff *ax_skb;
1817                 unsigned char *packet;
1818                 u16 size;
1819
1820                 header = get_unaligned_le32(skb->data);
1821                 skb_pull(skb, 4 + NET_IP_ALIGN);
1822                 packet = skb->data;
1823
1824                 /* get the packet length */
1825                 size = (u16)((header & RX_STS_FL_) >> 16);
1826                 align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1827
1828                 if (unlikely(header & RX_STS_ES_)) {
1829                         netif_dbg(dev, rx_err, dev->net,
1830                                   "Error header=0x%08x\n", header);
1831                         dev->net->stats.rx_errors++;
1832                         dev->net->stats.rx_dropped++;
1833
1834                         if (header & RX_STS_CRC_) {
1835                                 dev->net->stats.rx_crc_errors++;
1836                         } else {
1837                                 if (header & (RX_STS_TL_ | RX_STS_RF_))
1838                                         dev->net->stats.rx_frame_errors++;
1839
1840                                 if ((header & RX_STS_LE_) &&
1841                                         (!(header & RX_STS_FT_)))
1842                                         dev->net->stats.rx_length_errors++;
1843                         }
1844                 } else {
1845                         /* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1846                         if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1847                                 netif_dbg(dev, rx_err, dev->net,
1848                                           "size err header=0x%08x\n", header);
1849                                 return 0;
1850                         }
1851
1852                         /* last frame in this batch */
1853                         if (skb->len == size) {
1854                                 if (dev->net->features & NETIF_F_RXCSUM)
1855                                         smsc95xx_rx_csum_offload(skb);
1856                                 skb_trim(skb, skb->len - 4); /* remove fcs */
1857                                 skb->truesize = size + sizeof(struct sk_buff);
1858
1859                                 return 1;
1860                         }
1861
1862                         ax_skb = skb_clone(skb, GFP_ATOMIC);
1863                         if (unlikely(!ax_skb)) {
1864                                 netdev_warn(dev->net, "Error allocating skb\n");
1865                                 return 0;
1866                         }
1867
1868                         ax_skb->len = size;
1869                         ax_skb->data = packet;
1870                         skb_set_tail_pointer(ax_skb, size);
1871
1872                         if (dev->net->features & NETIF_F_RXCSUM)
1873                                 smsc95xx_rx_csum_offload(ax_skb);
1874                         skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1875                         ax_skb->truesize = size + sizeof(struct sk_buff);
1876
1877                         usbnet_skb_return(dev, ax_skb);
1878                 }
1879
1880                 skb_pull(skb, size);
1881
1882                 /* padding bytes before the next frame starts */
1883                 if (skb->len)
1884                         skb_pull(skb, align_count);
1885         }
1886
1887         return 1;
1888 }
1889
1890 static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1891 {
1892         u16 low_16 = (u16)skb_checksum_start_offset(skb);
1893         u16 high_16 = low_16 + skb->csum_offset;
1894         return (high_16 << 16) | low_16;
1895 }
1896
1897 /* The TX CSUM won't work if the checksum lies in the last 4 bytes of the
1898  * transmission. This is fairly unlikely, only seems to trigger with some
1899  * short TCP ACK packets sent.
1900  *
1901  * Note, this calculation should probably check for the alignment of the
1902  * data as well, but a straight check for csum being in the last four bytes
1903  * of the packet should be ok for now.
1904  */
1905 static bool smsc95xx_can_tx_checksum(struct sk_buff *skb)
1906 {
1907        unsigned int len = skb->len - skb_checksum_start_offset(skb);
1908
1909        if (skb->len <= 45)
1910                return false;
1911        return skb->csum_offset < (len - (4 + 1));
1912 }
1913
1914 static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1915                                          struct sk_buff *skb, gfp_t flags)
1916 {
1917         bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
1918         int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
1919         u32 tx_cmd_a, tx_cmd_b;
1920         void *ptr;
1921
1922         /* We do not advertise SG, so skbs should be already linearized */
1923         BUG_ON(skb_shinfo(skb)->nr_frags);
1924
1925         /* Make writable and expand header space by overhead if required */
1926         if (skb_cow_head(skb, overhead)) {
1927                 /* Must deallocate here as returning NULL to indicate error
1928                  * means the skb won't be deallocated in the caller.
1929                  */
1930                 dev_kfree_skb_any(skb);
1931                 return NULL;
1932         }
1933
1934         tx_cmd_b = (u32)skb->len;
1935         tx_cmd_a = tx_cmd_b | TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
1936
1937         if (csum) {
1938                 if (!smsc95xx_can_tx_checksum(skb)) {
1939                         /* workaround - hardware tx checksum does not work
1940                          * properly with extremely small packets */
1941                         long csstart = skb_checksum_start_offset(skb);
1942                         __wsum calc = csum_partial(skb->data + csstart,
1943                                 skb->len - csstart, 0);
1944                         *((__sum16 *)(skb->data + csstart
1945                                 + skb->csum_offset)) = csum_fold(calc);
1946
1947                         csum = false;
1948                 } else {
1949                         u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
1950                         ptr = skb_push(skb, 4);
1951                         put_unaligned_le32(csum_preamble, ptr);
1952
1953                         tx_cmd_a += 4;
1954                         tx_cmd_b += 4;
1955                         tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
1956                 }
1957         }
1958
1959         ptr = skb_push(skb, 8);
1960         put_unaligned_le32(tx_cmd_a, ptr);
1961         put_unaligned_le32(tx_cmd_b, ptr+4);
1962
1963         return skb;
1964 }
1965
1966 static int smsc95xx_manage_power(struct usbnet *dev, int on)
1967 {
1968         struct smsc95xx_priv *pdata = dev->driver_priv;
1969
1970         dev->intf->needs_remote_wakeup = on;
1971
1972         if (pdata->features & FEATURE_REMOTE_WAKEUP)
1973                 return 0;
1974
1975         /* this chip revision isn't capable of remote wakeup */
1976         netdev_info(dev->net, "hardware isn't capable of remote wakeup\n");
1977
1978         if (on)
1979                 usb_autopm_get_interface_no_resume(dev->intf);
1980         else
1981                 usb_autopm_put_interface(dev->intf);
1982
1983         return 0;
1984 }
1985
1986 static const struct driver_info smsc95xx_info = {
1987         .description    = "smsc95xx USB 2.0 Ethernet",
1988         .bind           = smsc95xx_bind,
1989         .unbind         = smsc95xx_unbind,
1990         .reset          = smsc95xx_reset,
1991         .check_connect  = smsc95xx_start_phy,
1992         .stop           = smsc95xx_stop,
1993         .rx_fixup       = smsc95xx_rx_fixup,
1994         .tx_fixup       = smsc95xx_tx_fixup,
1995         .status         = smsc95xx_status,
1996         .manage_power   = smsc95xx_manage_power,
1997         .flags          = FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
1998 };
1999
2000 static const struct usb_device_id products[] = {
2001         {
2002                 /* SMSC9500 USB Ethernet Device */
2003                 USB_DEVICE(0x0424, 0x9500),
2004                 .driver_info = (unsigned long) &smsc95xx_info,
2005         },
2006         {
2007                 /* SMSC9505 USB Ethernet Device */
2008                 USB_DEVICE(0x0424, 0x9505),
2009                 .driver_info = (unsigned long) &smsc95xx_info,
2010         },
2011         {
2012                 /* SMSC9500A USB Ethernet Device */
2013                 USB_DEVICE(0x0424, 0x9E00),
2014                 .driver_info = (unsigned long) &smsc95xx_info,
2015         },
2016         {
2017                 /* SMSC9505A USB Ethernet Device */
2018                 USB_DEVICE(0x0424, 0x9E01),
2019                 .driver_info = (unsigned long) &smsc95xx_info,
2020         },
2021         {
2022                 /* SMSC9512/9514 USB Hub & Ethernet Device */
2023                 USB_DEVICE(0x0424, 0xec00),
2024                 .driver_info = (unsigned long) &smsc95xx_info,
2025         },
2026         {
2027                 /* SMSC9500 USB Ethernet Device (SAL10) */
2028                 USB_DEVICE(0x0424, 0x9900),
2029                 .driver_info = (unsigned long) &smsc95xx_info,
2030         },
2031         {
2032                 /* SMSC9505 USB Ethernet Device (SAL10) */
2033                 USB_DEVICE(0x0424, 0x9901),
2034                 .driver_info = (unsigned long) &smsc95xx_info,
2035         },
2036         {
2037                 /* SMSC9500A USB Ethernet Device (SAL10) */
2038                 USB_DEVICE(0x0424, 0x9902),
2039                 .driver_info = (unsigned long) &smsc95xx_info,
2040         },
2041         {
2042                 /* SMSC9505A USB Ethernet Device (SAL10) */
2043                 USB_DEVICE(0x0424, 0x9903),
2044                 .driver_info = (unsigned long) &smsc95xx_info,
2045         },
2046         {
2047                 /* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
2048                 USB_DEVICE(0x0424, 0x9904),
2049                 .driver_info = (unsigned long) &smsc95xx_info,
2050         },
2051         {
2052                 /* SMSC9500A USB Ethernet Device (HAL) */
2053                 USB_DEVICE(0x0424, 0x9905),
2054                 .driver_info = (unsigned long) &smsc95xx_info,
2055         },
2056         {
2057                 /* SMSC9505A USB Ethernet Device (HAL) */
2058                 USB_DEVICE(0x0424, 0x9906),
2059                 .driver_info = (unsigned long) &smsc95xx_info,
2060         },
2061         {
2062                 /* SMSC9500 USB Ethernet Device (Alternate ID) */
2063                 USB_DEVICE(0x0424, 0x9907),
2064                 .driver_info = (unsigned long) &smsc95xx_info,
2065         },
2066         {
2067                 /* SMSC9500A USB Ethernet Device (Alternate ID) */
2068                 USB_DEVICE(0x0424, 0x9908),
2069                 .driver_info = (unsigned long) &smsc95xx_info,
2070         },
2071         {
2072                 /* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
2073                 USB_DEVICE(0x0424, 0x9909),
2074                 .driver_info = (unsigned long) &smsc95xx_info,
2075         },
2076         {
2077                 /* SMSC LAN9530 USB Ethernet Device */
2078                 USB_DEVICE(0x0424, 0x9530),
2079                 .driver_info = (unsigned long) &smsc95xx_info,
2080         },
2081         {
2082                 /* SMSC LAN9730 USB Ethernet Device */
2083                 USB_DEVICE(0x0424, 0x9730),
2084                 .driver_info = (unsigned long) &smsc95xx_info,
2085         },
2086         {
2087                 /* SMSC LAN89530 USB Ethernet Device */
2088                 USB_DEVICE(0x0424, 0x9E08),
2089                 .driver_info = (unsigned long) &smsc95xx_info,
2090         },
2091         { },            /* END */
2092 };
2093 MODULE_DEVICE_TABLE(usb, products);
2094
2095 static struct usb_driver smsc95xx_driver = {
2096         .name           = "smsc95xx",
2097         .id_table       = products,
2098         .probe          = usbnet_probe,
2099         .suspend        = smsc95xx_suspend,
2100         .resume         = smsc95xx_resume,
2101         .reset_resume   = smsc95xx_reset_resume,
2102         .disconnect     = usbnet_disconnect,
2103         .disable_hub_initiated_lpm = 1,
2104         .supports_autosuspend = 1,
2105 };
2106
2107 module_usb_driver(smsc95xx_driver);
2108
2109 MODULE_AUTHOR("Nancy Lin");
2110 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
2111 MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
2112 MODULE_LICENSE("GPL");