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