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 < 4) {
  99                 ret = ret < 0 ? ret : -ENODATA;
 100
 101                 if (ret != -ENODEV)
 102                         netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d\n",
 103                                     index, ret);
 104                 return ret;
 105         }
 106
 107         le32_to_cpus(&buf);
 108         *data = buf;
 109
 110         return ret;
 111 }
 112
 113 static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
 114                                            u32 data)
 115 {
 116         struct smsc95xx_priv *pdata = dev->driver_priv;
 117         u32 buf;
 118         int ret;
 119         int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
 120
 121         if (current != pdata->pm_task)
 122                 fn = usbnet_write_cmd;
 123         else
 124                 fn = usbnet_write_cmd_nopm;
 125
 126         buf = data;
 127         cpu_to_le32s(&buf);
 128
 129         ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
 130                  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 131                  0, index, &buf, 4);
 132         if (ret < 0 && ret != -ENODEV)
 133                 netdev_warn(dev->net, "Failed to write reg index 0x%08x: %d\n",
 134                             index, ret);
 135
 136         return ret;
 137 }
 138
 139 /* Loop until the read is completed with timeout
 140  * called with phy_mutex held */
 141 static int __must_check smsc95xx_phy_wait_not_busy(struct usbnet *dev)
 142 {
 143         unsigned long start_time = jiffies;
 144         u32 val;
 145         int ret;
 146
 147         do {
 148                 ret = smsc95xx_read_reg(dev, MII_ADDR, &val);
 149                 if (ret < 0) {
 150                         /* Ignore -ENODEV error during disconnect() */
 151                         if (ret == -ENODEV)
 152                                 return 0;
 153                         netdev_warn(dev->net, "Error reading MII_ACCESS\n");
 154                         return ret;
 155                 }
 156
 157                 if (!(val & MII_BUSY_))
 158                         return 0;
 159         } while (!time_after(jiffies, start_time + HZ));
 160
 161         return -EIO;
 162 }
 163
 164 static u32 mii_address_cmd(int phy_id, int idx, u16 op)
 165 {
 166         return (phy_id & 0x1f) << 11 | (idx & 0x1f) << 6 | op;
 167 }
 168
 169 static int smsc95xx_mdio_read(struct usbnet *dev, int phy_id, int idx)
 170 {
 171         u32 val, addr;
 172         int ret;
 173
 174         mutex_lock(&dev->phy_mutex);
 175
 176         /* confirm MII not busy */
 177         ret = smsc95xx_phy_wait_not_busy(dev);
 178         if (ret < 0) {
 179                 netdev_warn(dev->net, "%s: MII is busy\n", __func__);
 180                 goto done;
 181         }
 182
 183         /* set the address, index & direction (read from PHY) */
 184         addr = mii_address_cmd(phy_id, idx, MII_READ_ | MII_BUSY_);
 185         ret = smsc95xx_write_reg(dev, MII_ADDR, addr);
 186         if (ret < 0) {
 187                 if (ret != -ENODEV)
 188                         netdev_warn(dev->net, "Error writing MII_ADDR\n");
 189                 goto done;
 190         }
 191
 192         ret = smsc95xx_phy_wait_not_busy(dev);
 193         if (ret < 0) {
 194                 netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
 195                 goto done;
 196         }
 197
 198         ret = smsc95xx_read_reg(dev, MII_DATA, &val);
 199         if (ret < 0) {
 200                 if (ret != -ENODEV)
 201                         netdev_warn(dev->net, "Error reading MII_DATA\n");
 202                 goto done;
 203         }
 204
 205         ret = (u16)(val & 0xFFFF);
 206
 207 done:
 208         mutex_unlock(&dev->phy_mutex);
 209
 210         /* Ignore -ENODEV error during disconnect() */
 211         if (ret == -ENODEV)
 212                 return 0;
 213         return ret;
 214 }
 215
 216 static void smsc95xx_mdio_write(struct usbnet *dev, int phy_id, int idx,
 217                                 int regval)
 218 {
 219         u32 val, addr;
 220         int ret;
 221
 222         mutex_lock(&dev->phy_mutex);
 223
 224         /* confirm MII not busy */
 225         ret = smsc95xx_phy_wait_not_busy(dev);
 226         if (ret < 0) {
 227                 netdev_warn(dev->net, "%s: MII is busy\n", __func__);
 228                 goto done;
 229         }
 230
 231         val = regval;
 232         ret = smsc95xx_write_reg(dev, MII_DATA, val);
 233         if (ret < 0) {
 234                 if (ret != -ENODEV)
 235                         netdev_warn(dev->net, "Error writing MII_DATA\n");
 236                 goto done;
 237         }
 238
 239         /* set the address, index & direction (write to PHY) */
 240         addr = mii_address_cmd(phy_id, idx, MII_WRITE_ | MII_BUSY_);
 241         ret = smsc95xx_write_reg(dev, MII_ADDR, addr);
 242         if (ret < 0) {
 243                 if (ret != -ENODEV)
 244                         netdev_warn(dev->net, "Error writing MII_ADDR\n");
 245                 goto done;
 246         }
 247
 248         ret = smsc95xx_phy_wait_not_busy(dev);
 249         if (ret < 0) {
 250                 netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
 251                 goto done;
 252         }
 253
 254 done:
 255         mutex_unlock(&dev->phy_mutex);
 256 }
 257
 258 static int smsc95xx_mdiobus_reset(struct mii_bus *bus)
 259 {
 260         struct smsc95xx_priv *pdata;
 261         struct usbnet *dev;
 262         u32 val;
 263         int ret;
 264
 265         dev = bus->priv;
 266         pdata = dev->driver_priv;
 267
 268         if (pdata->is_internal_phy)
 269                 return 0;
 270
 271         mutex_lock(&dev->phy_mutex);
 272
 273         ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
 274         if (ret < 0)
 275                 goto reset_out;
 276
 277         val |= PM_CTL_PHY_RST_;
 278
 279         ret = smsc95xx_write_reg(dev, PM_CTRL, val);
 280         if (ret < 0)
 281                 goto reset_out;
 282
 283         /* Driver has no knowledge at this point about the external PHY.
 284          * The 802.3 specifies that the reset process shall
 285          * be completed within 0.5 s.
 286          */
 287         fsleep(500000);
 288
 289 reset_out:
 290         mutex_unlock(&dev->phy_mutex);
 291
 292         return 0;
 293 }
 294
 295 static int smsc95xx_mdiobus_read(struct mii_bus *bus, int phy_id, int idx)
 296 {
 297         struct usbnet *dev = bus->priv;
 298
 299         return smsc95xx_mdio_read(dev, phy_id, idx);
 300 }
 301
 302 static int smsc95xx_mdiobus_write(struct mii_bus *bus, int phy_id, int idx,
 303                                   u16 regval)
 304 {
 305         struct usbnet *dev = bus->priv;
 306
 307         smsc95xx_mdio_write(dev, phy_id, idx, regval);
 308         return 0;
 309 }
 310
 311 static int __must_check smsc95xx_wait_eeprom(struct usbnet *dev)
 312 {
 313         unsigned long start_time = jiffies;
 314         u32 val;
 315         int ret;
 316
 317         do {
 318                 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
 319                 if (ret < 0) {
 320                         netdev_warn(dev->net, "Error reading E2P_CMD\n");
 321                         return ret;
 322                 }
 323
 324                 if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
 325                         break;
 326                 udelay(40);
 327         } while (!time_after(jiffies, start_time + HZ));
 328
 329         if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
 330                 netdev_warn(dev->net, "EEPROM read operation timeout\n");
 331                 return -EIO;
 332         }
 333
 334         return 0;
 335 }
 336
 337 static int __must_check smsc95xx_eeprom_confirm_not_busy(struct usbnet *dev)
 338 {
 339         unsigned long start_time = jiffies;
 340         u32 val;
 341         int ret;
 342
 343         do {
 344                 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
 345                 if (ret < 0) {
 346                         netdev_warn(dev->net, "Error reading E2P_CMD\n");
 347                         return ret;
 348                 }
 349
 350                 if (!(val & E2P_CMD_BUSY_))
 351                         return 0;
 352
 353                 udelay(40);
 354         } while (!time_after(jiffies, start_time + HZ));
 355
 356         netdev_warn(dev->net, "EEPROM is busy\n");
 357         return -EIO;
 358 }
 359
 360 static int smsc95xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
 361                                 u8 *data)
 362 {
 363         u32 val;
 364         int i, ret;
 365
 366         BUG_ON(!dev);
 367         BUG_ON(!data);
 368
 369         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 370         if (ret)
 371                 return ret;
 372
 373         for (i = 0; i < length; i++) {
 374                 val = E2P_CMD_BUSY_ | E2P_CMD_READ_ | (offset & E2P_CMD_ADDR_);
 375                 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 376                 if (ret < 0) {
 377                         netdev_warn(dev->net, "Error writing E2P_CMD\n");
 378                         return ret;
 379                 }
 380
 381                 ret = smsc95xx_wait_eeprom(dev);
 382                 if (ret < 0)
 383                         return ret;
 384
 385                 ret = smsc95xx_read_reg(dev, E2P_DATA, &val);
 386                 if (ret < 0) {
 387                         netdev_warn(dev->net, "Error reading E2P_DATA\n");
 388                         return ret;
 389                 }
 390
 391                 data[i] = val & 0xFF;
 392                 offset++;
 393         }
 394
 395         return 0;
 396 }
 397
 398 static int smsc95xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
 399                                  u8 *data)
 400 {
 401         u32 val;
 402         int i, ret;
 403
 404         BUG_ON(!dev);
 405         BUG_ON(!data);
 406
 407         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 408         if (ret)
 409                 return ret;
 410
 411         /* Issue write/erase enable command */
 412         val = E2P_CMD_BUSY_ | E2P_CMD_EWEN_;
 413         ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 414         if (ret < 0) {
 415                 netdev_warn(dev->net, "Error writing E2P_DATA\n");
 416                 return ret;
 417         }
 418
 419         ret = smsc95xx_wait_eeprom(dev);
 420         if (ret < 0)
 421                 return ret;
 422
 423         for (i = 0; i < length; i++) {
 424
 425                 /* Fill data register */
 426                 val = data[i];
 427                 ret = smsc95xx_write_reg(dev, E2P_DATA, val);
 428                 if (ret < 0) {
 429                         netdev_warn(dev->net, "Error writing E2P_DATA\n");
 430                         return ret;
 431                 }
 432
 433                 /* Send "write" command */
 434                 val = E2P_CMD_BUSY_ | E2P_CMD_WRITE_ | (offset & E2P_CMD_ADDR_);
 435                 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 436                 if (ret < 0) {
 437                         netdev_warn(dev->net, "Error writing E2P_CMD\n");
 438                         return ret;
 439                 }
 440
 441                 ret = smsc95xx_wait_eeprom(dev);
 442                 if (ret < 0)
 443                         return ret;
 444
 445                 offset++;
 446         }
 447
 448         return 0;
 449 }
 450
 451 static int __must_check smsc95xx_write_reg_async(struct usbnet *dev, u16 index,
 452                                                  u32 data)
 453 {
 454         const u16 size = 4;
 455         u32 buf;
 456         int ret;
 457
 458         buf = data;
 459         cpu_to_le32s(&buf);
 460
 461         ret = usbnet_write_cmd_async(dev, USB_VENDOR_REQUEST_WRITE_REGISTER,
 462                                      USB_DIR_OUT | USB_TYPE_VENDOR |
 463                                      USB_RECIP_DEVICE,
 464                                      0, index, &buf, size);
 465         if (ret < 0)
 466                 netdev_warn(dev->net, "Error write async cmd, sts=%d\n",
 467                             ret);
 468         return ret;
 469 }
 470
 471 /* returns hash bit number for given MAC address
 472  * example:
 473  * 01 00 5E 00 00 01 -> returns bit number 31 */
 474 static unsigned int smsc95xx_hash(char addr[ETH_ALEN])
 475 {
 476         return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
 477 }
 478
 479 static void smsc95xx_set_multicast(struct net_device *netdev)
 480 {
 481         struct usbnet *dev = netdev_priv(netdev);
 482         struct smsc95xx_priv *pdata = dev->driver_priv;
 483         unsigned long flags;
 484         int ret;
 485
 486         pdata->hash_hi = 0;
 487         pdata->hash_lo = 0;
 488
 489         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 490
 491         if (dev->net->flags & IFF_PROMISC) {
 492                 netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
 493                 pdata->mac_cr |= MAC_CR_PRMS_;
 494                 pdata->mac_cr &= ~(MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 495         } else if (dev->net->flags & IFF_ALLMULTI) {
 496                 netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
 497                 pdata->mac_cr |= MAC_CR_MCPAS_;
 498                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_HPFILT_);
 499         } else if (!netdev_mc_empty(dev->net)) {
 500                 struct netdev_hw_addr *ha;
 501
 502                 pdata->mac_cr |= MAC_CR_HPFILT_;
 503                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);
 504
 505                 netdev_for_each_mc_addr(ha, netdev) {
 506                         u32 bitnum = smsc95xx_hash(ha->addr);
 507                         u32 mask = 0x01 << (bitnum & 0x1F);
 508                         if (bitnum & 0x20)
 509                                 pdata->hash_hi |= mask;
 510                         else
 511                                 pdata->hash_lo |= mask;
 512                 }
 513
 514                 netif_dbg(dev, drv, dev->net, "HASHH=0x%08X, HASHL=0x%08X\n",
 515                                    pdata->hash_hi, pdata->hash_lo);
 516         } else {
 517                 netif_dbg(dev, drv, dev->net, "receive own packets only\n");
 518                 pdata->mac_cr &=
 519                         ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 520         }
 521
 522         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 523
 524         /* Initiate async writes, as we can't wait for completion here */
 525         ret = smsc95xx_write_reg_async(dev, HASHH, pdata->hash_hi);
 526         if (ret < 0)
 527                 netdev_warn(dev->net, "failed to initiate async write to HASHH\n");
 528
 529         ret = smsc95xx_write_reg_async(dev, HASHL, pdata->hash_lo);
 530         if (ret < 0)
 531                 netdev_warn(dev->net, "failed to initiate async write to HASHL\n");
 532
 533         ret = smsc95xx_write_reg_async(dev, MAC_CR, pdata->mac_cr);
 534         if (ret < 0)
 535                 netdev_warn(dev->net, "failed to initiate async write to MAC_CR\n");
 536 }
 537
 538 static int smsc95xx_phy_update_flowcontrol(struct usbnet *dev)
 539 {
 540         u32 flow = 0, afc_cfg;
 541         struct smsc95xx_priv *pdata = dev->driver_priv;
 542         bool tx_pause, rx_pause;
 543
 544         int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
 545         if (ret < 0)
 546                 return ret;
 547
 548         if (pdata->phydev->duplex == DUPLEX_FULL) {
 549                 phy_get_pause(pdata->phydev, &tx_pause, &rx_pause);
 550
 551                 if (rx_pause)
 552                         flow = 0xFFFF0002;
 553
 554                 if (tx_pause) {
 555                         afc_cfg |= 0xF;
 556                         flow |= 0xFFFF0000;
 557                 } else {
 558                         afc_cfg &= ~0xF;
 559                 }
 560
 561                 netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
 562                           rx_pause ? "enabled" : "disabled",
 563                           tx_pause ? "enabled" : "disabled");
 564         } else {
 565                 netif_dbg(dev, link, dev->net, "half duplex\n");
 566                 afc_cfg |= 0xF;
 567         }
 568
 569         ret = smsc95xx_write_reg(dev, FLOW, flow);
 570         if (ret < 0)
 571                 return ret;
 572
 573         return smsc95xx_write_reg(dev, AFC_CFG, afc_cfg);
 574 }
 575
 576 static void smsc95xx_mac_update_fullduplex(struct usbnet *dev)
 577 {
 578         struct smsc95xx_priv *pdata = dev->driver_priv;
 579         unsigned long flags;
 580         int ret;
 581
 582         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 583         if (pdata->phydev->duplex != DUPLEX_FULL) {
 584                 pdata->mac_cr &= ~MAC_CR_FDPX_;
 585                 pdata->mac_cr |= MAC_CR_RCVOWN_;
 586         } else {
 587                 pdata->mac_cr &= ~MAC_CR_RCVOWN_;
 588                 pdata->mac_cr |= MAC_CR_FDPX_;
 589         }
 590         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 591
 592         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 593         if (ret < 0) {
 594                 if (ret != -ENODEV)
 595                         netdev_warn(dev->net,
 596                                     "Error updating MAC full duplex mode\n");
 597                 return;
 598         }
 599
 600         ret = smsc95xx_phy_update_flowcontrol(dev);
 601         if (ret < 0)
 602                 netdev_warn(dev->net, "Error updating PHY flow control\n");
 603 }
 604
 605 static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
 606 {
 607         struct smsc95xx_priv *pdata = dev->driver_priv;
 608         unsigned long flags;
 609         u32 intdata;
 610
 611         if (urb->actual_length != 4) {
 612                 netdev_warn(dev->net, "unexpected urb length %d\n",
 613                             urb->actual_length);
 614                 return;
 615         }
 616
 617         intdata = get_unaligned_le32(urb->transfer_buffer);
 618         netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
 619
 620         local_irq_save(flags);
 621
 622         if (intdata & INT_ENP_PHY_INT_)
 623                 generic_handle_domain_irq(pdata->irqdomain, PHY_HWIRQ);
 624         else
 625                 netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
 626                             intdata);
 627
 628         local_irq_restore(flags);
 629 }
 630
 631 /* Enable or disable Tx & Rx checksum offload engines */
 632 static int smsc95xx_set_features(struct net_device *netdev,
 633         netdev_features_t features)
 634 {
 635         struct usbnet *dev = netdev_priv(netdev);
 636         u32 read_buf;
 637         int ret;
 638
 639         ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
 640         if (ret < 0)
 641                 return ret;
 642
 643         if (features & NETIF_F_IP_CSUM)
 644                 read_buf |= Tx_COE_EN_;
 645         else
 646                 read_buf &= ~Tx_COE_EN_;
 647
 648         if (features & NETIF_F_RXCSUM)
 649                 read_buf |= Rx_COE_EN_;
 650         else
 651                 read_buf &= ~Rx_COE_EN_;
 652
 653         ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
 654         if (ret < 0)
 655                 return ret;
 656
 657         netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
 658         return 0;
 659 }
 660
 661 static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
 662 {
 663         return MAX_EEPROM_SIZE;
 664 }
 665
 666 static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
 667                                        struct ethtool_eeprom *ee, u8 *data)
 668 {
 669         struct usbnet *dev = netdev_priv(netdev);
 670
 671         ee->magic = LAN95XX_EEPROM_MAGIC;
 672
 673         return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
 674 }
 675
 676 static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
 677                                        struct ethtool_eeprom *ee, u8 *data)
 678 {
 679         struct usbnet *dev = netdev_priv(netdev);
 680
 681         if (ee->magic != LAN95XX_EEPROM_MAGIC) {
 682                 netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
 683                             ee->magic);
 684                 return -EINVAL;
 685         }
 686
 687         return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
 688 }
 689
 690 static int smsc95xx_ethtool_getregslen(struct net_device *netdev)
 691 {
 692         /* all smsc95xx registers */
 693         return COE_CR - ID_REV + sizeof(u32);
 694 }
 695
 696 static void
 697 smsc95xx_ethtool_getregs(struct net_device *netdev, struct ethtool_regs *regs,
 698                          void *buf)
 699 {
 700         struct usbnet *dev = netdev_priv(netdev);
 701         unsigned int i, j;
 702         int retval;
 703         u32 *data = buf;
 704
 705         retval = smsc95xx_read_reg(dev, ID_REV, &regs->version);
 706         if (retval < 0) {
 707                 netdev_warn(netdev, "REGS: cannot read ID_REV\n");
 708                 return;
 709         }
 710
 711         for (i = ID_REV, j = 0; i <= COE_CR; i += (sizeof(u32)), j++) {
 712                 retval = smsc95xx_read_reg(dev, i, &data[j]);
 713                 if (retval < 0) {
 714                         netdev_warn(netdev, "REGS: cannot read reg[%x]\n", i);
 715                         return;
 716                 }
 717         }
 718 }
 719
 720 static void smsc95xx_ethtool_get_wol(struct net_device *net,
 721                                      struct ethtool_wolinfo *wolinfo)
 722 {
 723         struct usbnet *dev = netdev_priv(net);
 724         struct smsc95xx_priv *pdata = dev->driver_priv;
 725
 726         wolinfo->supported = SUPPORTED_WAKE;
 727         wolinfo->wolopts = pdata->wolopts;
 728 }
 729
 730 static int smsc95xx_ethtool_set_wol(struct net_device *net,
 731                                     struct ethtool_wolinfo *wolinfo)
 732 {
 733         struct usbnet *dev = netdev_priv(net);
 734         struct smsc95xx_priv *pdata = dev->driver_priv;
 735         int ret;
 736
 737         if (wolinfo->wolopts & ~SUPPORTED_WAKE)
 738                 return -EINVAL;
 739
 740         pdata->wolopts = wolinfo->wolopts & SUPPORTED_WAKE;
 741
 742         ret = device_set_wakeup_enable(&dev->udev->dev, pdata->wolopts);
 743         if (ret < 0)
 744                 netdev_warn(dev->net, "device_set_wakeup_enable error %d\n", ret);
 745
 746         return ret;
 747 }
 748
 749 static u32 smsc95xx_get_link(struct net_device *net)
 750 {
 751         phy_read_status(net->phydev);
 752         return net->phydev->link;
 753 }
 754
 755 static void smsc95xx_ethtool_get_strings(struct net_device *netdev, u32 sset,
 756                                         u8 *data)
 757 {
 758         switch (sset) {
 759         case ETH_SS_TEST:
 760                 net_selftest_get_strings(data);
 761                 break;
 762         }
 763 }
 764
 765 static int smsc95xx_ethtool_get_sset_count(struct net_device *ndev, int sset)
 766 {
 767         switch (sset) {
 768         case ETH_SS_TEST:
 769                 return net_selftest_get_count();
 770         default:
 771                 return -EOPNOTSUPP;
 772         }
 773 }
 774
 775 static const struct ethtool_ops smsc95xx_ethtool_ops = {
 776         .get_link       = smsc95xx_get_link,
 777         .nway_reset     = phy_ethtool_nway_reset,
 778         .get_drvinfo    = usbnet_get_drvinfo,
 779         .get_msglevel   = usbnet_get_msglevel,
 780         .set_msglevel   = usbnet_set_msglevel,
 781         .get_eeprom_len = smsc95xx_ethtool_get_eeprom_len,
 782         .get_eeprom     = smsc95xx_ethtool_get_eeprom,
 783         .set_eeprom     = smsc95xx_ethtool_set_eeprom,
 784         .get_regs_len   = smsc95xx_ethtool_getregslen,
 785         .get_regs       = smsc95xx_ethtool_getregs,
 786         .get_wol        = smsc95xx_ethtool_get_wol,
 787         .set_wol        = smsc95xx_ethtool_set_wol,
 788         .get_link_ksettings     = phy_ethtool_get_link_ksettings,
 789         .set_link_ksettings     = phy_ethtool_set_link_ksettings,
 790         .get_ts_info    = ethtool_op_get_ts_info,
 791         .self_test      = net_selftest,
 792         .get_strings    = smsc95xx_ethtool_get_strings,
 793         .get_sset_count = smsc95xx_ethtool_get_sset_count,
 794 };
 795
 796 static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
 797 {
 798         if (!netif_running(netdev))
 799                 return -EINVAL;
 800
 801         return phy_mii_ioctl(netdev->phydev, rq, cmd);
 802 }
 803
 804 static void smsc95xx_init_mac_address(struct usbnet *dev)
 805 {
 806         u8 addr[ETH_ALEN];
 807
 808         /* maybe the boot loader passed the MAC address in devicetree */
 809         if (!platform_get_ethdev_address(&dev->udev->dev, dev->net)) {
 810                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 811                         /* device tree values are valid so use them */
 812                         netif_dbg(dev, ifup, dev->net, "MAC address read from the device tree\n");
 813                         return;
 814                 }
 815         }
 816
 817         /* try reading mac address from EEPROM */
 818         if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN, addr) == 0) {
 819                 eth_hw_addr_set(dev->net, addr);
 820                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 821                         /* eeprom values are valid so use them */
 822                         netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
 823                         return;
 824                 }
 825         }
 826
 827         /* no useful static MAC address found. generate a random one */
 828         eth_hw_addr_random(dev->net);
 829         netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
 830 }
 831
 832 static int smsc95xx_set_mac_address(struct usbnet *dev)
 833 {
 834         u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
 835                 dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
 836         u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
 837         int ret;
 838
 839         ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
 840         if (ret < 0)
 841                 return ret;
 842
 843         return smsc95xx_write_reg(dev, ADDRH, addr_hi);
 844 }
 845
 846 /* starts the TX path */
 847 static int smsc95xx_start_tx_path(struct usbnet *dev)
 848 {
 849         struct smsc95xx_priv *pdata = dev->driver_priv;
 850         unsigned long flags;
 851         int ret;
 852
 853         /* Enable Tx at MAC */
 854         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 855         pdata->mac_cr |= MAC_CR_TXEN_;
 856         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 857
 858         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 859         if (ret < 0)
 860                 return ret;
 861
 862         /* Enable Tx at SCSRs */
 863         return smsc95xx_write_reg(dev, TX_CFG, TX_CFG_ON_);
 864 }
 865
 866 /* Starts the Receive path */
 867 static int smsc95xx_start_rx_path(struct usbnet *dev)
 868 {
 869         struct smsc95xx_priv *pdata = dev->driver_priv;
 870         unsigned long flags;
 871
 872         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 873         pdata->mac_cr |= MAC_CR_RXEN_;
 874         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 875
 876         return smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 877 }
 878
 879 static int smsc95xx_reset(struct usbnet *dev)
 880 {
 881         struct smsc95xx_priv *pdata = dev->driver_priv;
 882         u32 read_buf, write_buf, burst_cap;
 883         int ret = 0, timeout;
 884
 885         netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
 886
 887         ret = smsc95xx_write_reg(dev, HW_CFG, HW_CFG_LRST_);
 888         if (ret < 0)
 889                 return ret;
 890
 891         timeout = 0;
 892         do {
 893                 msleep(10);
 894                 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 895                 if (ret < 0)
 896                         return ret;
 897                 timeout++;
 898         } while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
 899
 900         if (timeout >= 100) {
 901                 netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
 902                 return -ETIMEDOUT;
 903         }
 904
 905         ret = smsc95xx_set_mac_address(dev);
 906         if (ret < 0)
 907                 return ret;
 908
 909         netif_dbg(dev, ifup, dev->net, "MAC Address: %pM\n",
 910                   dev->net->dev_addr);
 911
 912         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 913         if (ret < 0)
 914                 return ret;
 915
 916         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x\n",
 917                   read_buf);
 918
 919         read_buf |= HW_CFG_BIR_;
 920
 921         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 922         if (ret < 0)
 923                 return ret;
 924
 925         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 926         if (ret < 0)
 927                 return ret;
 928
 929         netif_dbg(dev, ifup, dev->net,
 930                   "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
 931                   read_buf);
 932
 933         if (!turbo_mode) {
 934                 burst_cap = 0;
 935                 dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
 936         } else if (dev->udev->speed == USB_SPEED_HIGH) {
 937                 burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
 938                 dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
 939         } else {
 940                 burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
 941                 dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
 942         }
 943
 944         netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld\n",
 945                   (ulong)dev->rx_urb_size);
 946
 947         ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
 948         if (ret < 0)
 949                 return ret;
 950
 951         ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
 952         if (ret < 0)
 953                 return ret;
 954
 955         netif_dbg(dev, ifup, dev->net,
 956                   "Read Value from BURST_CAP after writing: 0x%08x\n",
 957                   read_buf);
 958
 959         ret = smsc95xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
 960         if (ret < 0)
 961                 return ret;
 962
 963         ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
 964         if (ret < 0)
 965                 return ret;
 966
 967         netif_dbg(dev, ifup, dev->net,
 968                   "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
 969                   read_buf);
 970
 971         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 972         if (ret < 0)
 973                 return ret;
 974
 975         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG: 0x%08x\n",
 976                   read_buf);
 977
 978         if (turbo_mode)
 979                 read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
 980
 981         read_buf &= ~HW_CFG_RXDOFF_;
 982
 983         /* set Rx data offset=2, Make IP header aligns on word boundary. */
 984         read_buf |= NET_IP_ALIGN << 9;
 985
 986         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 987         if (ret < 0)
 988                 return ret;
 989
 990         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 991         if (ret < 0)
 992                 return ret;
 993
 994         netif_dbg(dev, ifup, dev->net,
 995                   "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
 996
 997         ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
 998         if (ret < 0)
 999                 return ret;
1000
1001         ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
1002         if (ret < 0)
1003                 return ret;
1004         netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
1005
1006         /* Configure GPIO pins as LED outputs */
1007         write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
1008                 LED_GPIO_CFG_FDX_LED;
1009         ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
1010         if (ret < 0)
1011                 return ret;
1012
1013         /* Init Tx */
1014         ret = smsc95xx_write_reg(dev, FLOW, 0);
1015         if (ret < 0)
1016                 return ret;
1017
1018         ret = smsc95xx_write_reg(dev, AFC_CFG, AFC_CFG_DEFAULT);
1019         if (ret < 0)
1020                 return ret;
1021
1022         /* Don't need mac_cr_lock during initialisation */
1023         ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
1024         if (ret < 0)
1025                 return ret;
1026
1027         /* Init Rx */
1028         /* Set Vlan */
1029         ret = smsc95xx_write_reg(dev, VLAN1, (u32)ETH_P_8021Q);
1030         if (ret < 0)
1031                 return ret;
1032
1033         /* Enable or disable checksum offload engines */
1034         ret = smsc95xx_set_features(dev->net, dev->net->features);
1035         if (ret < 0) {
1036                 netdev_warn(dev->net, "Failed to set checksum offload features\n");
1037                 return ret;
1038         }
1039
1040         smsc95xx_set_multicast(dev->net);
1041
1042         ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
1043         if (ret < 0)
1044                 return ret;
1045
1046         /* enable PHY interrupts */
1047         read_buf |= INT_EP_CTL_PHY_INT_;
1048
1049         ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
1050         if (ret < 0)
1051                 return ret;
1052
1053         ret = smsc95xx_start_tx_path(dev);
1054         if (ret < 0) {
1055                 netdev_warn(dev->net, "Failed to start TX path\n");
1056                 return ret;
1057         }
1058
1059         ret = smsc95xx_start_rx_path(dev);
1060         if (ret < 0) {
1061                 netdev_warn(dev->net, "Failed to start RX path\n");
1062                 return ret;
1063         }
1064
1065         netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1066         return 0;
1067 }
1068
1069 static const struct net_device_ops smsc95xx_netdev_ops = {
1070         .ndo_open               = usbnet_open,
1071         .ndo_stop               = usbnet_stop,
1072         .ndo_start_xmit         = usbnet_start_xmit,
1073         .ndo_tx_timeout         = usbnet_tx_timeout,
1074         .ndo_change_mtu         = usbnet_change_mtu,
1075         .ndo_get_stats64        = dev_get_tstats64,
1076         .ndo_set_mac_address    = eth_mac_addr,
1077         .ndo_validate_addr      = eth_validate_addr,
1078         .ndo_eth_ioctl          = smsc95xx_ioctl,
1079         .ndo_set_rx_mode        = smsc95xx_set_multicast,
1080         .ndo_set_features       = smsc95xx_set_features,
1081 };
1082
1083 static void smsc95xx_handle_link_change(struct net_device *net)
1084 {
1085         struct usbnet *dev = netdev_priv(net);
1086
1087         phy_print_status(net->phydev);
1088         smsc95xx_mac_update_fullduplex(dev);
1089         usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1090 }
1091
1092 static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1093 {
1094         struct smsc95xx_priv *pdata;
1095         char usb_path[64];
1096         int ret, phy_irq;
1097         u32 val;
1098
1099         printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1100
1101         ret = usbnet_get_endpoints(dev, intf);
1102         if (ret < 0) {
1103                 netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1104                 return ret;
1105         }
1106
1107         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
1108         if (!pdata)
1109                 return -ENOMEM;
1110
1111         dev->driver_priv = pdata;
1112
1113         spin_lock_init(&pdata->mac_cr_lock);
1114
1115         /* LAN95xx devices do not alter the computed checksum of 0 to 0xffff.
1116          * RFC 2460, ipv6 UDP calculated checksum yields a result of zero must
1117          * be changed to 0xffff. RFC 768, ipv4 UDP computed checksum is zero,
1118          * it is transmitted as all ones. The zero transmitted checksum means
1119          * transmitter generated no checksum. Hence, enable csum offload only
1120          * for ipv4 packets.
1121          */
1122         if (DEFAULT_TX_CSUM_ENABLE)
1123                 dev->net->features |= NETIF_F_IP_CSUM;
1124         if (DEFAULT_RX_CSUM_ENABLE)
1125                 dev->net->features |= NETIF_F_RXCSUM;
1126
1127         dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1128         set_bit(EVENT_NO_IP_ALIGN, &dev->flags);
1129
1130         smsc95xx_init_mac_address(dev);
1131
1132         /* Init all registers */
1133         ret = smsc95xx_reset(dev);
1134         if (ret)
1135                 goto free_pdata;
1136
1137         /* create irq domain for use by PHY driver and GPIO consumers */
1138         usb_make_path(dev->udev, usb_path, sizeof(usb_path));
1139         pdata->irqfwnode = irq_domain_alloc_named_fwnode(usb_path);
1140         if (!pdata->irqfwnode) {
1141                 ret = -ENOMEM;
1142                 goto free_pdata;
1143         }
1144
1145         pdata->irqdomain = irq_domain_create_linear(pdata->irqfwnode,
1146                                                     SMSC95XX_NR_IRQS,
1147                                                     &irq_domain_simple_ops,
1148                                                     pdata);
1149         if (!pdata->irqdomain) {
1150                 ret = -ENOMEM;
1151                 goto free_irqfwnode;
1152         }
1153
1154         phy_irq = irq_create_mapping(pdata->irqdomain, PHY_HWIRQ);
1155         if (!phy_irq) {
1156                 ret = -ENOENT;
1157                 goto remove_irqdomain;
1158         }
1159
1160         pdata->irqchip = dummy_irq_chip;
1161         pdata->irqchip.name = SMSC_CHIPNAME;
1162         irq_set_chip_and_handler_name(phy_irq, &pdata->irqchip,
1163                                       handle_simple_irq, "phy");
1164
1165         pdata->mdiobus = mdiobus_alloc();
1166         if (!pdata->mdiobus) {
1167                 ret = -ENOMEM;
1168                 goto dispose_irq;
1169         }
1170
1171         ret = smsc95xx_read_reg(dev, HW_CFG, &val);
1172         if (ret < 0)
1173                 goto free_mdio;
1174
1175         pdata->is_internal_phy = !(val & HW_CFG_PSEL_);
1176         if (pdata->is_internal_phy)
1177                 pdata->mdiobus->phy_mask = ~(1u << SMSC95XX_INTERNAL_PHY_ID);
1178
1179         pdata->mdiobus->priv = dev;
1180         pdata->mdiobus->read = smsc95xx_mdiobus_read;
1181         pdata->mdiobus->write = smsc95xx_mdiobus_write;
1182         pdata->mdiobus->reset = smsc95xx_mdiobus_reset;
1183         pdata->mdiobus->name = "smsc95xx-mdiobus";
1184         pdata->mdiobus->parent = &dev->udev->dev;
1185
1186         snprintf(pdata->mdiobus->id, ARRAY_SIZE(pdata->mdiobus->id),
1187                  "usb-%03d:%03d", dev->udev->bus->busnum, dev->udev->devnum);
1188
1189         ret = mdiobus_register(pdata->mdiobus);
1190         if (ret) {
1191                 netdev_err(dev->net, "Could not register MDIO bus\n");
1192                 goto free_mdio;
1193         }
1194
1195         pdata->phydev = phy_find_first(pdata->mdiobus);
1196         if (!pdata->phydev) {
1197                 netdev_err(dev->net, "no PHY found\n");
1198                 ret = -ENODEV;
1199                 goto unregister_mdio;
1200         }
1201
1202         pdata->phydev->irq = phy_irq;
1203         pdata->phydev->is_internal = pdata->is_internal_phy;
1204
1205         /* detect device revision as different features may be available */
1206         ret = smsc95xx_read_reg(dev, ID_REV, &val);
1207         if (ret < 0)
1208                 goto unregister_mdio;
1209
1210         val >>= 16;
1211         if ((val == ID_REV_CHIP_ID_9500A_) || (val == ID_REV_CHIP_ID_9530_) ||
1212             (val == ID_REV_CHIP_ID_89530_) || (val == ID_REV_CHIP_ID_9730_))
1213                 pdata->features = (FEATURE_8_WAKEUP_FILTERS |
1214                         FEATURE_PHY_NLP_CROSSOVER |
1215                         FEATURE_REMOTE_WAKEUP);
1216         else if (val == ID_REV_CHIP_ID_9512_)
1217                 pdata->features = FEATURE_8_WAKEUP_FILTERS;
1218
1219         dev->net->netdev_ops = &smsc95xx_netdev_ops;
1220         dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1221         dev->net->flags |= IFF_MULTICAST;
1222         dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
1223         dev->net->min_mtu = ETH_MIN_MTU;
1224         dev->net->max_mtu = ETH_DATA_LEN;
1225         dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
1226
1227         ret = phy_connect_direct(dev->net, pdata->phydev,
1228                                  &smsc95xx_handle_link_change,
1229                                  PHY_INTERFACE_MODE_MII);
1230         if (ret) {
1231                 netdev_err(dev->net, "can't attach PHY to %s\n", pdata->mdiobus->id);
1232                 goto unregister_mdio;
1233         }
1234
1235         phy_attached_info(dev->net->phydev);
1236
1237         return 0;
1238
1239 unregister_mdio:
1240         mdiobus_unregister(pdata->mdiobus);
1241
1242 free_mdio:
1243         mdiobus_free(pdata->mdiobus);
1244
1245 dispose_irq:
1246         irq_dispose_mapping(phy_irq);
1247
1248 remove_irqdomain:
1249         irq_domain_remove(pdata->irqdomain);
1250
1251 free_irqfwnode:
1252         irq_domain_free_fwnode(pdata->irqfwnode);
1253
1254 free_pdata:
1255         kfree(pdata);
1256         return ret;
1257 }
1258
1259 static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1260 {
1261         struct smsc95xx_priv *pdata = dev->driver_priv;
1262
1263         phy_disconnect(dev->net->phydev);
1264         mdiobus_unregister(pdata->mdiobus);
1265         mdiobus_free(pdata->mdiobus);
1266         irq_dispose_mapping(irq_find_mapping(pdata->irqdomain, PHY_HWIRQ));
1267         irq_domain_remove(pdata->irqdomain);
1268         irq_domain_free_fwnode(pdata->irqfwnode);
1269         netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1270         kfree(pdata);
1271 }
1272
1273 static int smsc95xx_start_phy(struct usbnet *dev)
1274 {
1275         phy_start(dev->net->phydev);
1276
1277         return 0;
1278 }
1279
1280 static int smsc95xx_stop(struct usbnet *dev)
1281 {
1282         phy_stop(dev->net->phydev);
1283
1284         return 0;
1285 }
1286
1287 static u32 smsc_crc(const u8 *buffer, size_t len, int filter)
1288 {
1289         u32 crc = bitrev16(crc16(0xFFFF, buffer, len));
1290         return crc << ((filter % 2) * 16);
1291 }
1292
1293 static int smsc95xx_link_ok(struct usbnet *dev)
1294 {
1295         struct smsc95xx_priv *pdata = dev->driver_priv;
1296         int ret;
1297
1298         /* first, a dummy read, needed to latch some MII phys */
1299         ret = smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, MII_BMSR);
1300         if (ret < 0)
1301                 return ret;
1302
1303         ret = smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, 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(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(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(dev, PM_CTRL, val);
1336         if (ret < 0)
1337                 return ret;
1338
1339         /* read back PM_CTRL */
1340         ret = smsc95xx_read_reg(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         int ret, phy_id = pdata->phydev->mdio.addr;
1353         u32 val;
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(dev, phy_id, PHY_EDPD_CONFIG,
1360                                     PHY_EDPD_CONFIG_DEFAULT);
1361
1362         /* enable energy detect power-down mode */
1363         ret = smsc95xx_mdio_read(dev, phy_id, PHY_MODE_CTRL_STS);
1364         if (ret < 0)
1365                 return ret;
1366
1367         ret |= MODE_CTRL_STS_EDPWRDOWN_;
1368
1369         smsc95xx_mdio_write(dev, phy_id, PHY_MODE_CTRL_STS, ret);
1370
1371         /* enter SUSPEND1 mode */
1372         ret = smsc95xx_read_reg(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(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(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(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(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(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(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(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(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         pdata->pm_task = current;
1494
1495         ret = usbnet_suspend(intf, message);
1496         if (ret < 0) {
1497                 netdev_warn(dev->net, "usbnet_suspend error\n");
1498                 pdata->pm_task = NULL;
1499                 return ret;
1500         }
1501
1502         if (pdata->suspend_flags) {
1503                 netdev_warn(dev->net, "error during last resume\n");
1504                 pdata->suspend_flags = 0;
1505         }
1506
1507         link_up = smsc95xx_link_ok(dev);
1508
1509         if (message.event == PM_EVENT_AUTO_SUSPEND &&
1510             (pdata->features & FEATURE_REMOTE_WAKEUP)) {
1511                 ret = smsc95xx_autosuspend(dev, link_up);
1512                 goto done;
1513         }
1514
1515         /* if we get this far we're not autosuspending */
1516         /* if no wol options set, or if link is down and we're not waking on
1517          * PHY activity, enter lowest power SUSPEND2 mode
1518          */
1519         if (!(pdata->wolopts & SUPPORTED_WAKE) ||
1520                 !(link_up || (pdata->wolopts & WAKE_PHY))) {
1521                 netdev_info(dev->net, "entering SUSPEND2 mode\n");
1522
1523                 /* disable energy detect (link up) & wake up events */
1524                 ret = smsc95xx_read_reg(dev, WUCSR, &val);
1525                 if (ret < 0)
1526                         goto done;
1527
1528                 val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
1529
1530                 ret = smsc95xx_write_reg(dev, WUCSR, val);
1531                 if (ret < 0)
1532                         goto done;
1533
1534                 ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1535                 if (ret < 0)
1536                         goto done;
1537
1538                 val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
1539
1540                 ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1541                 if (ret < 0)
1542                         goto done;
1543
1544                 ret = smsc95xx_enter_suspend2(dev);
1545                 goto done;
1546         }
1547
1548         if (pdata->wolopts & WAKE_PHY) {
1549                 /* if link is down then configure EDPD and enter SUSPEND1,
1550                  * otherwise enter SUSPEND0 below
1551                  */
1552                 if (!link_up) {
1553                         netdev_info(dev->net, "entering SUSPEND1 mode\n");
1554                         ret = smsc95xx_enter_suspend1(dev);
1555                         goto done;
1556                 }
1557         }
1558
1559         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1560                 u32 *filter_mask = kcalloc(32, sizeof(u32), GFP_KERNEL);
1561                 u32 command[2];
1562                 u32 offset[2];
1563                 u32 crc[4];
1564                 int wuff_filter_count =
1565                         (pdata->features & FEATURE_8_WAKEUP_FILTERS) ?
1566                         LAN9500A_WUFF_NUM : LAN9500_WUFF_NUM;
1567                 int i, filter = 0;
1568
1569                 if (!filter_mask) {
1570                         netdev_warn(dev->net, "Unable to allocate filter_mask\n");
1571                         ret = -ENOMEM;
1572                         goto done;
1573                 }
1574
1575                 memset(command, 0, sizeof(command));
1576                 memset(offset, 0, sizeof(offset));
1577                 memset(crc, 0, sizeof(crc));
1578
1579                 if (pdata->wolopts & WAKE_BCAST) {
1580                         const u8 bcast[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
1581                         netdev_info(dev->net, "enabling broadcast detection\n");
1582                         filter_mask[filter * 4] = 0x003F;
1583                         filter_mask[filter * 4 + 1] = 0x00;
1584                         filter_mask[filter * 4 + 2] = 0x00;
1585                         filter_mask[filter * 4 + 3] = 0x00;
1586                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1587                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1588                         crc[filter/2] |= smsc_crc(bcast, 6, filter);
1589                         filter++;
1590                 }
1591
1592                 if (pdata->wolopts & WAKE_MCAST) {
1593                         const u8 mcast[] = {0x01, 0x00, 0x5E};
1594                         netdev_info(dev->net, "enabling multicast detection\n");
1595                         filter_mask[filter * 4] = 0x0007;
1596                         filter_mask[filter * 4 + 1] = 0x00;
1597                         filter_mask[filter * 4 + 2] = 0x00;
1598                         filter_mask[filter * 4 + 3] = 0x00;
1599                         command[filter/4] |= 0x09UL << ((filter % 4) * 8);
1600                         offset[filter/4] |= 0x00  << ((filter % 4) * 8);
1601                         crc[filter/2] |= smsc_crc(mcast, 3, filter);
1602                         filter++;
1603                 }
1604
1605                 if (pdata->wolopts & WAKE_ARP) {
1606                         const u8 arp[] = {0x08, 0x06};
1607                         netdev_info(dev->net, "enabling ARP detection\n");
1608                         filter_mask[filter * 4] = 0x0003;
1609                         filter_mask[filter * 4 + 1] = 0x00;
1610                         filter_mask[filter * 4 + 2] = 0x00;
1611                         filter_mask[filter * 4 + 3] = 0x00;
1612                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1613                         offset[filter/4] |= 0x0C << ((filter % 4) * 8);
1614                         crc[filter/2] |= smsc_crc(arp, 2, filter);
1615                         filter++;
1616                 }
1617
1618                 if (pdata->wolopts & WAKE_UCAST) {
1619                         netdev_info(dev->net, "enabling unicast detection\n");
1620                         filter_mask[filter * 4] = 0x003F;
1621                         filter_mask[filter * 4 + 1] = 0x00;
1622                         filter_mask[filter * 4 + 2] = 0x00;
1623                         filter_mask[filter * 4 + 3] = 0x00;
1624                         command[filter/4] |= 0x01UL << ((filter % 4) * 8);
1625                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1626                         crc[filter/2] |= smsc_crc(dev->net->dev_addr, ETH_ALEN, filter);
1627                         filter++;
1628                 }
1629
1630                 for (i = 0; i < (wuff_filter_count * 4); i++) {
1631                         ret = smsc95xx_write_reg(dev, WUFF, filter_mask[i]);
1632                         if (ret < 0) {
1633                                 kfree(filter_mask);
1634                                 goto done;
1635                         }
1636                 }
1637                 kfree(filter_mask);
1638
1639                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1640                         ret = smsc95xx_write_reg(dev, WUFF, command[i]);
1641                         if (ret < 0)
1642                                 goto done;
1643                 }
1644
1645                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1646                         ret = smsc95xx_write_reg(dev, WUFF, offset[i]);
1647                         if (ret < 0)
1648                                 goto done;
1649                 }
1650
1651                 for (i = 0; i < (wuff_filter_count / 2); i++) {
1652                         ret = smsc95xx_write_reg(dev, WUFF, crc[i]);
1653                         if (ret < 0)
1654                                 goto done;
1655                 }
1656
1657                 /* clear any pending pattern match packet status */
1658                 ret = smsc95xx_read_reg(dev, WUCSR, &val);
1659                 if (ret < 0)
1660                         goto done;
1661
1662                 val |= WUCSR_WUFR_;
1663
1664                 ret = smsc95xx_write_reg(dev, WUCSR, val);
1665                 if (ret < 0)
1666                         goto done;
1667         }
1668
1669         if (pdata->wolopts & WAKE_MAGIC) {
1670                 /* clear any pending magic packet status */
1671                 ret = smsc95xx_read_reg(dev, WUCSR, &val);
1672                 if (ret < 0)
1673                         goto done;
1674
1675                 val |= WUCSR_MPR_;
1676
1677                 ret = smsc95xx_write_reg(dev, WUCSR, val);
1678                 if (ret < 0)
1679                         goto done;
1680         }
1681
1682         /* enable/disable wakeup sources */
1683         ret = smsc95xx_read_reg(dev, WUCSR, &val);
1684         if (ret < 0)
1685                 goto done;
1686
1687         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1688                 netdev_info(dev->net, "enabling pattern match wakeup\n");
1689                 val |= WUCSR_WAKE_EN_;
1690         } else {
1691                 netdev_info(dev->net, "disabling pattern match wakeup\n");
1692                 val &= ~WUCSR_WAKE_EN_;
1693         }
1694
1695         if (pdata->wolopts & WAKE_MAGIC) {
1696                 netdev_info(dev->net, "enabling magic packet wakeup\n");
1697                 val |= WUCSR_MPEN_;
1698         } else {
1699                 netdev_info(dev->net, "disabling magic packet wakeup\n");
1700                 val &= ~WUCSR_MPEN_;
1701         }
1702
1703         ret = smsc95xx_write_reg(dev, WUCSR, val);
1704         if (ret < 0)
1705                 goto done;
1706
1707         /* enable wol wakeup source */
1708         ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1709         if (ret < 0)
1710                 goto done;
1711
1712         val |= PM_CTL_WOL_EN_;
1713
1714         /* phy energy detect wakeup source */
1715         if (pdata->wolopts & WAKE_PHY)
1716                 val |= PM_CTL_ED_EN_;
1717
1718         ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1719         if (ret < 0)
1720                 goto done;
1721
1722         /* enable receiver to enable frame reception */
1723         smsc95xx_start_rx_path(dev);
1724
1725         /* some wol options are enabled, so enter SUSPEND0 */
1726         netdev_info(dev->net, "entering SUSPEND0 mode\n");
1727         ret = smsc95xx_enter_suspend0(dev);
1728
1729 done:
1730         /*
1731          * TODO: resume() might need to handle the suspend failure
1732          * in system sleep
1733          */
1734         if (ret && PMSG_IS_AUTO(message))
1735                 usbnet_resume(intf);
1736
1737         pdata->pm_task = NULL;
1738         return ret;
1739 }
1740
1741 static int smsc95xx_resume(struct usb_interface *intf)
1742 {
1743         struct usbnet *dev = usb_get_intfdata(intf);
1744         struct smsc95xx_priv *pdata;
1745         u8 suspend_flags;
1746         int ret;
1747         u32 val;
1748
1749         BUG_ON(!dev);
1750         pdata = dev->driver_priv;
1751         suspend_flags = pdata->suspend_flags;
1752
1753         netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags);
1754
1755         /* do this first to ensure it's cleared even in error case */
1756         pdata->suspend_flags = 0;
1757
1758         pdata->pm_task = current;
1759
1760         if (suspend_flags & SUSPEND_ALLMODES) {
1761                 /* clear wake-up sources */
1762                 ret = smsc95xx_read_reg(dev, WUCSR, &val);
1763                 if (ret < 0)
1764                         goto done;
1765
1766                 val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
1767
1768                 ret = smsc95xx_write_reg(dev, WUCSR, val);
1769                 if (ret < 0)
1770                         goto done;
1771
1772                 /* clear wake-up status */
1773                 ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1774                 if (ret < 0)
1775                         goto done;
1776
1777                 val &= ~PM_CTL_WOL_EN_;
1778                 val |= PM_CTL_WUPS_;
1779
1780                 ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1781                 if (ret < 0)
1782                         goto done;
1783         }
1784
1785         phy_init_hw(pdata->phydev);
1786
1787         ret = usbnet_resume(intf);
1788         if (ret < 0)
1789                 netdev_warn(dev->net, "usbnet_resume error\n");
1790
1791 done:
1792         pdata->pm_task = NULL;
1793         return ret;
1794 }
1795
1796 static int smsc95xx_reset_resume(struct usb_interface *intf)
1797 {
1798         struct usbnet *dev = usb_get_intfdata(intf);
1799         struct smsc95xx_priv *pdata = dev->driver_priv;
1800         int ret;
1801
1802         pdata->pm_task = current;
1803         ret = smsc95xx_reset(dev);
1804         pdata->pm_task = NULL;
1805         if (ret < 0)
1806                 return ret;
1807
1808         return smsc95xx_resume(intf);
1809 }
1810
1811 static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1812 {
1813         skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
1814         skb->ip_summed = CHECKSUM_COMPLETE;
1815         skb_trim(skb, skb->len - 2);
1816 }
1817
1818 static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1819 {
1820         /* This check is no longer done by usbnet */
1821         if (skb->len < dev->net->hard_header_len)
1822                 return 0;
1823
1824         while (skb->len > 0) {
1825                 u32 header, align_count;
1826                 struct sk_buff *ax_skb;
1827                 unsigned char *packet;
1828                 u16 size;
1829
1830                 header = get_unaligned_le32(skb->data);
1831                 skb_pull(skb, 4 + NET_IP_ALIGN);
1832                 packet = skb->data;
1833
1834                 /* get the packet length */
1835                 size = (u16)((header & RX_STS_FL_) >> 16);
1836                 align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1837
1838                 if (unlikely(size > skb->len)) {
1839                         netif_dbg(dev, rx_err, dev->net,
1840                                   "size err header=0x%08x\n", header);
1841                         return 0;
1842                 }
1843
1844                 if (unlikely(header & RX_STS_ES_)) {
1845                         netif_dbg(dev, rx_err, dev->net,
1846                                   "Error header=0x%08x\n", header);
1847                         dev->net->stats.rx_errors++;
1848                         dev->net->stats.rx_dropped++;
1849
1850                         if (header & RX_STS_CRC_) {
1851                                 dev->net->stats.rx_crc_errors++;
1852                         } else {
1853                                 if (header & (RX_STS_TL_ | RX_STS_RF_))
1854                                         dev->net->stats.rx_frame_errors++;
1855
1856                                 if ((header & RX_STS_LE_) &&
1857                                         (!(header & RX_STS_FT_)))
1858                                         dev->net->stats.rx_length_errors++;
1859                         }
1860                 } else {
1861                         /* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1862                         if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1863                                 netif_dbg(dev, rx_err, dev->net,
1864                                           "size err header=0x%08x\n", header);
1865                                 return 0;
1866                         }
1867
1868                         /* last frame in this batch */
1869                         if (skb->len == size) {
1870                                 if (dev->net->features & NETIF_F_RXCSUM)
1871                                         smsc95xx_rx_csum_offload(skb);
1872                                 skb_trim(skb, skb->len - 4); /* remove fcs */
1873                                 skb->truesize = size + sizeof(struct sk_buff);
1874
1875                                 return 1;
1876                         }
1877
1878                         ax_skb = skb_clone(skb, GFP_ATOMIC);
1879                         if (unlikely(!ax_skb)) {
1880                                 netdev_warn(dev->net, "Error allocating skb\n");
1881                                 return 0;
1882                         }
1883
1884                         ax_skb->len = size;
1885                         ax_skb->data = packet;
1886                         skb_set_tail_pointer(ax_skb, size);
1887
1888                         if (dev->net->features & NETIF_F_RXCSUM)
1889                                 smsc95xx_rx_csum_offload(ax_skb);
1890                         skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1891                         ax_skb->truesize = size + sizeof(struct sk_buff);
1892
1893                         usbnet_skb_return(dev, ax_skb);
1894                 }
1895
1896                 skb_pull(skb, size);
1897
1898                 /* padding bytes before the next frame starts */
1899                 if (skb->len)
1900                         skb_pull(skb, align_count);
1901         }
1902
1903         return 1;
1904 }
1905
1906 static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1907 {
1908         u16 low_16 = (u16)skb_checksum_start_offset(skb);
1909         u16 high_16 = low_16 + skb->csum_offset;
1910         return (high_16 << 16) | low_16;
1911 }
1912
1913 /* The TX CSUM won't work if the checksum lies in the last 4 bytes of the
1914  * transmission. This is fairly unlikely, only seems to trigger with some
1915  * short TCP ACK packets sent.
1916  *
1917  * Note, this calculation should probably check for the alignment of the
1918  * data as well, but a straight check for csum being in the last four bytes
1919  * of the packet should be ok for now.
1920  */
1921 static bool smsc95xx_can_tx_checksum(struct sk_buff *skb)
1922 {
1923        unsigned int len = skb->len - skb_checksum_start_offset(skb);
1924
1925        if (skb->len <= 45)
1926                return false;
1927        return skb->csum_offset < (len - (4 + 1));
1928 }
1929
1930 static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1931                                          struct sk_buff *skb, gfp_t flags)
1932 {
1933         bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
1934         int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
1935         u32 tx_cmd_a, tx_cmd_b;
1936         void *ptr;
1937
1938         /* We do not advertise SG, so skbs should be already linearized */
1939         BUG_ON(skb_shinfo(skb)->nr_frags);
1940
1941         /* Make writable and expand header space by overhead if required */
1942         if (skb_cow_head(skb, overhead)) {
1943                 /* Must deallocate here as returning NULL to indicate error
1944                  * means the skb won't be deallocated in the caller.
1945                  */
1946                 dev_kfree_skb_any(skb);
1947                 return NULL;
1948         }
1949
1950         tx_cmd_b = (u32)skb->len;
1951         tx_cmd_a = tx_cmd_b | TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
1952
1953         if (csum) {
1954                 if (!smsc95xx_can_tx_checksum(skb)) {
1955                         /* workaround - hardware tx checksum does not work
1956                          * properly with extremely small packets */
1957                         long csstart = skb_checksum_start_offset(skb);
1958                         __wsum calc = csum_partial(skb->data + csstart,
1959                                 skb->len - csstart, 0);
1960                         *((__sum16 *)(skb->data + csstart
1961                                 + skb->csum_offset)) = csum_fold(calc);
1962
1963                         csum = false;
1964                 } else {
1965                         u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
1966                         ptr = skb_push(skb, 4);
1967                         put_unaligned_le32(csum_preamble, ptr);
1968
1969                         tx_cmd_a += 4;
1970                         tx_cmd_b += 4;
1971                         tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
1972                 }
1973         }
1974
1975         ptr = skb_push(skb, 8);
1976         put_unaligned_le32(tx_cmd_a, ptr);
1977         put_unaligned_le32(tx_cmd_b, ptr+4);
1978
1979         return skb;
1980 }
1981
1982 static int smsc95xx_manage_power(struct usbnet *dev, int on)
1983 {
1984         struct smsc95xx_priv *pdata = dev->driver_priv;
1985
1986         dev->intf->needs_remote_wakeup = on;
1987
1988         if (pdata->features & FEATURE_REMOTE_WAKEUP)
1989                 return 0;
1990
1991         /* this chip revision isn't capable of remote wakeup */
1992         netdev_info(dev->net, "hardware isn't capable of remote wakeup\n");
1993
1994         if (on)
1995                 usb_autopm_get_interface_no_resume(dev->intf);
1996         else
1997                 usb_autopm_put_interface(dev->intf);
1998
1999         return 0;
2000 }
2001
2002 static const struct driver_info smsc95xx_info = {
2003         .description    = "smsc95xx USB 2.0 Ethernet",
2004         .bind           = smsc95xx_bind,
2005         .unbind         = smsc95xx_unbind,
2006         .reset          = smsc95xx_reset,
2007         .check_connect  = smsc95xx_start_phy,
2008         .stop           = smsc95xx_stop,
2009         .rx_fixup       = smsc95xx_rx_fixup,
2010         .tx_fixup       = smsc95xx_tx_fixup,
2011         .status         = smsc95xx_status,
2012         .manage_power   = smsc95xx_manage_power,
2013         .flags          = FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
2014 };
2015
2016 static const struct usb_device_id products[] = {
2017         {
2018                 /* SMSC9500 USB Ethernet Device */
2019                 USB_DEVICE(0x0424, 0x9500),
2020                 .driver_info = (unsigned long) &smsc95xx_info,
2021         },
2022         {
2023                 /* SMSC9505 USB Ethernet Device */
2024                 USB_DEVICE(0x0424, 0x9505),
2025                 .driver_info = (unsigned long) &smsc95xx_info,
2026         },
2027         {
2028                 /* SMSC9500A USB Ethernet Device */
2029                 USB_DEVICE(0x0424, 0x9E00),
2030                 .driver_info = (unsigned long) &smsc95xx_info,
2031         },
2032         {
2033                 /* SMSC9505A USB Ethernet Device */
2034                 USB_DEVICE(0x0424, 0x9E01),
2035                 .driver_info = (unsigned long) &smsc95xx_info,
2036         },
2037         {
2038                 /* SMSC9512/9514 USB Hub & Ethernet Device */
2039                 USB_DEVICE(0x0424, 0xec00),
2040                 .driver_info = (unsigned long) &smsc95xx_info,
2041         },
2042         {
2043                 /* SMSC9500 USB Ethernet Device (SAL10) */
2044                 USB_DEVICE(0x0424, 0x9900),
2045                 .driver_info = (unsigned long) &smsc95xx_info,
2046         },
2047         {
2048                 /* SMSC9505 USB Ethernet Device (SAL10) */
2049                 USB_DEVICE(0x0424, 0x9901),
2050                 .driver_info = (unsigned long) &smsc95xx_info,
2051         },
2052         {
2053                 /* SMSC9500A USB Ethernet Device (SAL10) */
2054                 USB_DEVICE(0x0424, 0x9902),
2055                 .driver_info = (unsigned long) &smsc95xx_info,
2056         },
2057         {
2058                 /* SMSC9505A USB Ethernet Device (SAL10) */
2059                 USB_DEVICE(0x0424, 0x9903),
2060                 .driver_info = (unsigned long) &smsc95xx_info,
2061         },
2062         {
2063                 /* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
2064                 USB_DEVICE(0x0424, 0x9904),
2065                 .driver_info = (unsigned long) &smsc95xx_info,
2066         },
2067         {
2068                 /* SMSC9500A USB Ethernet Device (HAL) */
2069                 USB_DEVICE(0x0424, 0x9905),
2070                 .driver_info = (unsigned long) &smsc95xx_info,
2071         },
2072         {
2073                 /* SMSC9505A USB Ethernet Device (HAL) */
2074                 USB_DEVICE(0x0424, 0x9906),
2075                 .driver_info = (unsigned long) &smsc95xx_info,
2076         },
2077         {
2078                 /* SMSC9500 USB Ethernet Device (Alternate ID) */
2079                 USB_DEVICE(0x0424, 0x9907),
2080                 .driver_info = (unsigned long) &smsc95xx_info,
2081         },
2082         {
2083                 /* SMSC9500A USB Ethernet Device (Alternate ID) */
2084                 USB_DEVICE(0x0424, 0x9908),
2085                 .driver_info = (unsigned long) &smsc95xx_info,
2086         },
2087         {
2088                 /* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
2089                 USB_DEVICE(0x0424, 0x9909),
2090                 .driver_info = (unsigned long) &smsc95xx_info,
2091         },
2092         {
2093                 /* SMSC LAN9530 USB Ethernet Device */
2094                 USB_DEVICE(0x0424, 0x9530),
2095                 .driver_info = (unsigned long) &smsc95xx_info,
2096         },
2097         {
2098                 /* SMSC LAN9730 USB Ethernet Device */
2099                 USB_DEVICE(0x0424, 0x9730),
2100                 .driver_info = (unsigned long) &smsc95xx_info,
2101         },
2102         {
2103                 /* SMSC LAN89530 USB Ethernet Device */
2104                 USB_DEVICE(0x0424, 0x9E08),
2105                 .driver_info = (unsigned long) &smsc95xx_info,
2106         },
2107         {
2108                 /* SYSTEC USB-SPEmodule1 10BASE-T1L Ethernet Device */
2109                 USB_DEVICE(0x0878, 0x1400),
2110                 .driver_info = (unsigned long)&smsc95xx_info,
2111         },
2112         {
2113                 /* Microchip's EVB-LAN8670-USB 10BASE-T1S Ethernet Device */
2114                 USB_DEVICE(0x184F, 0x0051),
2115                 .driver_info = (unsigned long)&smsc95xx_info,
2116         },
2117         { },            /* END */
2118 };
2119 MODULE_DEVICE_TABLE(usb, products);
2120
2121 static struct usb_driver smsc95xx_driver = {
2122         .name           = "smsc95xx",
2123         .id_table       = products,
2124         .probe          = usbnet_probe,
2125         .suspend        = smsc95xx_suspend,
2126         .resume         = smsc95xx_resume,
2127         .reset_resume   = smsc95xx_reset_resume,
2128         .disconnect     = usbnet_disconnect,
2129         .disable_hub_initiated_lpm = 1,
2130         .supports_autosuspend = 1,
2131 };
2132
2133 module_usb_driver(smsc95xx_driver);
2134
2135 MODULE_AUTHOR("Nancy Lin");
2136 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
2137 MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
2138 MODULE_LICENSE("GPL");