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 "smsc95xx.h"
  26
  27 #define SMSC_CHIPNAME                   "smsc95xx"
  28 #define SMSC_DRIVER_VERSION             "2.0.0"
  29 #define HS_USB_PKT_SIZE                 (512)
  30 #define FS_USB_PKT_SIZE                 (64)
  31 #define DEFAULT_HS_BURST_CAP_SIZE       (16 * 1024 + 5 * HS_USB_PKT_SIZE)
  32 #define DEFAULT_FS_BURST_CAP_SIZE       (6 * 1024 + 33 * FS_USB_PKT_SIZE)
  33 #define DEFAULT_BULK_IN_DELAY           (0x00002000)
  34 #define MAX_SINGLE_PACKET_SIZE          (2048)
  35 #define LAN95XX_EEPROM_MAGIC            (0x9500)
  36 #define EEPROM_MAC_OFFSET               (0x01)
  37 #define DEFAULT_TX_CSUM_ENABLE          (true)
  38 #define DEFAULT_RX_CSUM_ENABLE          (true)
  39 #define SMSC95XX_INTERNAL_PHY_ID        (1)
  40 #define SMSC95XX_TX_OVERHEAD            (8)
  41 #define SMSC95XX_TX_OVERHEAD_CSUM       (12)
  42 #define SUPPORTED_WAKE                  (WAKE_PHY | WAKE_UCAST | WAKE_BCAST | \
  43                                          WAKE_MCAST | WAKE_ARP | WAKE_MAGIC)
  44
  45 #define FEATURE_8_WAKEUP_FILTERS        (0x01)
  46 #define FEATURE_PHY_NLP_CROSSOVER       (0x02)
  47 #define FEATURE_REMOTE_WAKEUP           (0x04)
  48
  49 #define SUSPEND_SUSPEND0                (0x01)
  50 #define SUSPEND_SUSPEND1                (0x02)
  51 #define SUSPEND_SUSPEND2                (0x04)
  52 #define SUSPEND_SUSPEND3                (0x08)
  53 #define SUSPEND_ALLMODES                (SUSPEND_SUSPEND0 | SUSPEND_SUSPEND1 | \
  54                                          SUSPEND_SUSPEND2 | SUSPEND_SUSPEND3)
  55 #define MAC_ADDR_LEN                    (6)
  56
  57 #define SMSC95XX_NR_IRQS                (1) /* raise to 12 for GPIOs */
  58 #define PHY_HWIRQ                       (SMSC95XX_NR_IRQS - 1)
  59
  60 struct smsc95xx_priv {
  61         u32 mac_cr;
  62         u32 hash_hi;
  63         u32 hash_lo;
  64         u32 wolopts;
  65         spinlock_t mac_cr_lock;
  66         u8 features;
  67         u8 suspend_flags;
  68         struct irq_chip irqchip;
  69         struct irq_domain *irqdomain;
  70         struct fwnode_handle *irqfwnode;
  71         struct mii_bus *mdiobus;
  72         struct phy_device *phydev;
  73         struct task_struct *pm_task;
  74 };
  75
  76 static bool turbo_mode = true;
  77 module_param(turbo_mode, bool, 0644);
  78 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
  79
  80 static bool truesize_mode = false;
  81 module_param(truesize_mode, bool, 0644);
  82 MODULE_PARM_DESC(truesize_mode, "Report larger truesize value");
  83
  84 static int packetsize = 2560;
  85 module_param(packetsize, int, 0644);
  86 MODULE_PARM_DESC(packetsize, "Override the RX URB packet size");
  87
  88 static char *macaddr = ":";
  89 module_param(macaddr, charp, 0);
  90 MODULE_PARM_DESC(macaddr, "MAC address");
  91
  92 static int __must_check __smsc95xx_read_reg(struct usbnet *dev, u32 index,
  93                                             u32 *data, int in_pm)
  94 {
  95         struct smsc95xx_priv *pdata = dev->driver_priv;
  96         u32 buf;
  97         int ret;
  98         int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
  99
 100         BUG_ON(!dev);
 101
 102         if (current != pdata->pm_task)
 103                 fn = usbnet_read_cmd;
 104         else
 105                 fn = usbnet_read_cmd_nopm;
 106
 107         ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
 108                  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 109                  0, index, &buf, 4);
 110         if (ret < 0) {
 111                 if (ret != -ENODEV)
 112                         netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d\n",
 113                                     index, ret);
 114                 return ret;
 115         }
 116
 117         le32_to_cpus(&buf);
 118         *data = buf;
 119
 120         return ret;
 121 }
 122
 123 static int __must_check __smsc95xx_write_reg(struct usbnet *dev, u32 index,
 124                                              u32 data, int in_pm)
 125 {
 126         struct smsc95xx_priv *pdata = dev->driver_priv;
 127         u32 buf;
 128         int ret;
 129         int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
 130
 131         BUG_ON(!dev);
 132
 133         if (current != pdata->pm_task)
 134                 fn = usbnet_write_cmd;
 135         else
 136                 fn = usbnet_write_cmd_nopm;
 137
 138         buf = data;
 139         cpu_to_le32s(&buf);
 140
 141         ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
 142                  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 143                  0, index, &buf, 4);
 144         if (ret < 0 && ret != -ENODEV)
 145                 netdev_warn(dev->net, "Failed to write reg index 0x%08x: %d\n",
 146                             index, ret);
 147
 148         return ret;
 149 }
 150
 151 static int __must_check smsc95xx_read_reg_nopm(struct usbnet *dev, u32 index,
 152                                                u32 *data)
 153 {
 154         return __smsc95xx_read_reg(dev, index, data, 1);
 155 }
 156
 157 static int __must_check smsc95xx_write_reg_nopm(struct usbnet *dev, u32 index,
 158                                                 u32 data)
 159 {
 160         return __smsc95xx_write_reg(dev, index, data, 1);
 161 }
 162
 163 static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
 164                                           u32 *data)
 165 {
 166         return __smsc95xx_read_reg(dev, index, data, 0);
 167 }
 168
 169 static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
 170                                            u32 data)
 171 {
 172         return __smsc95xx_write_reg(dev, index, data, 0);
 173 }
 174
 175 /* Loop until the read is completed with timeout
 176  * called with phy_mutex held */
 177 static int __must_check __smsc95xx_phy_wait_not_busy(struct usbnet *dev,
 178                                                      int in_pm)
 179 {
 180         unsigned long start_time = jiffies;
 181         u32 val;
 182         int ret;
 183
 184         do {
 185                 ret = __smsc95xx_read_reg(dev, MII_ADDR, &val, in_pm);
 186                 if (ret < 0) {
 187                         /* Ignore -ENODEV error during disconnect() */
 188                         if (ret == -ENODEV)
 189                                 return 0;
 190                         netdev_warn(dev->net, "Error reading MII_ACCESS\n");
 191                         return ret;
 192                 }
 193
 194                 if (!(val & MII_BUSY_))
 195                         return 0;
 196         } while (!time_after(jiffies, start_time + HZ));
 197
 198         return -EIO;
 199 }
 200
 201 static u32 mii_address_cmd(int phy_id, int idx, u16 op)
 202 {
 203         return (phy_id & 0x1f) << 11 | (idx & 0x1f) << 6 | op;
 204 }
 205
 206 static int __smsc95xx_mdio_read(struct usbnet *dev, int phy_id, int idx,
 207                                 int in_pm)
 208 {
 209         u32 val, addr;
 210         int ret;
 211
 212         mutex_lock(&dev->phy_mutex);
 213
 214         /* confirm MII not busy */
 215         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 216         if (ret < 0) {
 217                 netdev_warn(dev->net, "%s: MII is busy\n", __func__);
 218                 goto done;
 219         }
 220
 221         /* set the address, index & direction (read from PHY) */
 222         addr = mii_address_cmd(phy_id, idx, MII_READ_ | MII_BUSY_);
 223         ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
 224         if (ret < 0) {
 225                 if (ret != -ENODEV)
 226                         netdev_warn(dev->net, "Error writing MII_ADDR\n");
 227                 goto done;
 228         }
 229
 230         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 231         if (ret < 0) {
 232                 netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
 233                 goto done;
 234         }
 235
 236         ret = __smsc95xx_read_reg(dev, MII_DATA, &val, in_pm);
 237         if (ret < 0) {
 238                 if (ret != -ENODEV)
 239                         netdev_warn(dev->net, "Error reading MII_DATA\n");
 240                 goto done;
 241         }
 242
 243         ret = (u16)(val & 0xFFFF);
 244
 245 done:
 246         mutex_unlock(&dev->phy_mutex);
 247
 248         /* Ignore -ENODEV error during disconnect() */
 249         if (ret == -ENODEV)
 250                 return 0;
 251         return ret;
 252 }
 253
 254 static void __smsc95xx_mdio_write(struct usbnet *dev, int phy_id,
 255                                   int idx, int regval, int in_pm)
 256 {
 257         u32 val, addr;
 258         int ret;
 259
 260         mutex_lock(&dev->phy_mutex);
 261
 262         /* confirm MII not busy */
 263         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 264         if (ret < 0) {
 265                 netdev_warn(dev->net, "%s: MII is busy\n", __func__);
 266                 goto done;
 267         }
 268
 269         val = regval;
 270         ret = __smsc95xx_write_reg(dev, MII_DATA, val, in_pm);
 271         if (ret < 0) {
 272                 if (ret != -ENODEV)
 273                         netdev_warn(dev->net, "Error writing MII_DATA\n");
 274                 goto done;
 275         }
 276
 277         /* set the address, index & direction (write to PHY) */
 278         addr = mii_address_cmd(phy_id, idx, MII_WRITE_ | MII_BUSY_);
 279         ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
 280         if (ret < 0) {
 281                 if (ret != -ENODEV)
 282                         netdev_warn(dev->net, "Error writing MII_ADDR\n");
 283                 goto done;
 284         }
 285
 286         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
 287         if (ret < 0) {
 288                 netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
 289                 goto done;
 290         }
 291
 292 done:
 293         mutex_unlock(&dev->phy_mutex);
 294 }
 295
 296 static int smsc95xx_mdio_read_nopm(struct usbnet *dev, int idx)
 297 {
 298         struct smsc95xx_priv *pdata = dev->driver_priv;
 299
 300         return __smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, idx, 1);
 301 }
 302
 303 static void smsc95xx_mdio_write_nopm(struct usbnet *dev, int idx, int regval)
 304 {
 305         struct smsc95xx_priv *pdata = dev->driver_priv;
 306
 307         __smsc95xx_mdio_write(dev, pdata->phydev->mdio.addr, idx, regval, 1);
 308 }
 309
 310 static int smsc95xx_mdiobus_read(struct mii_bus *bus, int phy_id, int idx)
 311 {
 312         struct usbnet *dev = bus->priv;
 313
 314         return __smsc95xx_mdio_read(dev, phy_id, idx, 0);
 315 }
 316
 317 static int smsc95xx_mdiobus_write(struct mii_bus *bus, int phy_id, int idx,
 318                                   u16 regval)
 319 {
 320         struct usbnet *dev = bus->priv;
 321
 322         __smsc95xx_mdio_write(dev, phy_id, idx, regval, 0);
 323         return 0;
 324 }
 325
 326 static int __must_check smsc95xx_wait_eeprom(struct usbnet *dev)
 327 {
 328         unsigned long start_time = jiffies;
 329         u32 val;
 330         int ret;
 331
 332         do {
 333                 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
 334                 if (ret < 0) {
 335                         netdev_warn(dev->net, "Error reading E2P_CMD\n");
 336                         return ret;
 337                 }
 338
 339                 if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
 340                         break;
 341                 udelay(40);
 342         } while (!time_after(jiffies, start_time + HZ));
 343
 344         if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
 345                 netdev_warn(dev->net, "EEPROM read operation timeout\n");
 346                 return -EIO;
 347         }
 348
 349         return 0;
 350 }
 351
 352 static int __must_check smsc95xx_eeprom_confirm_not_busy(struct usbnet *dev)
 353 {
 354         unsigned long start_time = jiffies;
 355         u32 val;
 356         int ret;
 357
 358         do {
 359                 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
 360                 if (ret < 0) {
 361                         netdev_warn(dev->net, "Error reading E2P_CMD\n");
 362                         return ret;
 363                 }
 364
 365                 if (!(val & E2P_CMD_BUSY_))
 366                         return 0;
 367
 368                 udelay(40);
 369         } while (!time_after(jiffies, start_time + HZ));
 370
 371         netdev_warn(dev->net, "EEPROM is busy\n");
 372         return -EIO;
 373 }
 374
 375 static int smsc95xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
 376                                 u8 *data)
 377 {
 378         u32 val;
 379         int i, ret;
 380
 381         BUG_ON(!dev);
 382         BUG_ON(!data);
 383
 384         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 385         if (ret)
 386                 return ret;
 387
 388         for (i = 0; i < length; i++) {
 389                 val = E2P_CMD_BUSY_ | E2P_CMD_READ_ | (offset & E2P_CMD_ADDR_);
 390                 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 391                 if (ret < 0) {
 392                         netdev_warn(dev->net, "Error writing E2P_CMD\n");
 393                         return ret;
 394                 }
 395
 396                 ret = smsc95xx_wait_eeprom(dev);
 397                 if (ret < 0)
 398                         return ret;
 399
 400                 ret = smsc95xx_read_reg(dev, E2P_DATA, &val);
 401                 if (ret < 0) {
 402                         netdev_warn(dev->net, "Error reading E2P_DATA\n");
 403                         return ret;
 404                 }
 405
 406                 data[i] = val & 0xFF;
 407                 offset++;
 408         }
 409
 410         return 0;
 411 }
 412
 413 static int smsc95xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
 414                                  u8 *data)
 415 {
 416         u32 val;
 417         int i, ret;
 418
 419         BUG_ON(!dev);
 420         BUG_ON(!data);
 421
 422         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 423         if (ret)
 424                 return ret;
 425
 426         /* Issue write/erase enable command */
 427         val = E2P_CMD_BUSY_ | E2P_CMD_EWEN_;
 428         ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 429         if (ret < 0) {
 430                 netdev_warn(dev->net, "Error writing E2P_DATA\n");
 431                 return ret;
 432         }
 433
 434         ret = smsc95xx_wait_eeprom(dev);
 435         if (ret < 0)
 436                 return ret;
 437
 438         for (i = 0; i < length; i++) {
 439
 440                 /* Fill data register */
 441                 val = data[i];
 442                 ret = smsc95xx_write_reg(dev, E2P_DATA, val);
 443                 if (ret < 0) {
 444                         netdev_warn(dev->net, "Error writing E2P_DATA\n");
 445                         return ret;
 446                 }
 447
 448                 /* Send "write" command */
 449                 val = E2P_CMD_BUSY_ | E2P_CMD_WRITE_ | (offset & E2P_CMD_ADDR_);
 450                 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
 451                 if (ret < 0) {
 452                         netdev_warn(dev->net, "Error writing E2P_CMD\n");
 453                         return ret;
 454                 }
 455
 456                 ret = smsc95xx_wait_eeprom(dev);
 457                 if (ret < 0)
 458                         return ret;
 459
 460                 offset++;
 461         }
 462
 463         return 0;
 464 }
 465
 466 static int __must_check smsc95xx_write_reg_async(struct usbnet *dev, u16 index,
 467                                                  u32 data)
 468 {
 469         const u16 size = 4;
 470         u32 buf;
 471         int ret;
 472
 473         buf = data;
 474         cpu_to_le32s(&buf);
 475
 476         ret = usbnet_write_cmd_async(dev, USB_VENDOR_REQUEST_WRITE_REGISTER,
 477                                      USB_DIR_OUT | USB_TYPE_VENDOR |
 478                                      USB_RECIP_DEVICE,
 479                                      0, index, &buf, size);
 480         if (ret < 0)
 481                 netdev_warn(dev->net, "Error write async cmd, sts=%d\n",
 482                             ret);
 483         return ret;
 484 }
 485
 486 /* returns hash bit number for given MAC address
 487  * example:
 488  * 01 00 5E 00 00 01 -> returns bit number 31 */
 489 static unsigned int smsc95xx_hash(char addr[ETH_ALEN])
 490 {
 491         return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
 492 }
 493
 494 static void smsc95xx_set_multicast(struct net_device *netdev)
 495 {
 496         struct usbnet *dev = netdev_priv(netdev);
 497         struct smsc95xx_priv *pdata = dev->driver_priv;
 498         unsigned long flags;
 499         int ret;
 500
 501         pdata->hash_hi = 0;
 502         pdata->hash_lo = 0;
 503
 504         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 505
 506         if (dev->net->flags & IFF_PROMISC) {
 507                 netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
 508                 pdata->mac_cr |= MAC_CR_PRMS_;
 509                 pdata->mac_cr &= ~(MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 510         } else if (dev->net->flags & IFF_ALLMULTI) {
 511                 netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
 512                 pdata->mac_cr |= MAC_CR_MCPAS_;
 513                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_HPFILT_);
 514         } else if (!netdev_mc_empty(dev->net)) {
 515                 struct netdev_hw_addr *ha;
 516
 517                 pdata->mac_cr |= MAC_CR_HPFILT_;
 518                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);
 519
 520                 netdev_for_each_mc_addr(ha, netdev) {
 521                         u32 bitnum = smsc95xx_hash(ha->addr);
 522                         u32 mask = 0x01 << (bitnum & 0x1F);
 523                         if (bitnum & 0x20)
 524                                 pdata->hash_hi |= mask;
 525                         else
 526                                 pdata->hash_lo |= mask;
 527                 }
 528
 529                 netif_dbg(dev, drv, dev->net, "HASHH=0x%08X, HASHL=0x%08X\n",
 530                                    pdata->hash_hi, pdata->hash_lo);
 531         } else {
 532                 netif_dbg(dev, drv, dev->net, "receive own packets only\n");
 533                 pdata->mac_cr &=
 534                         ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 535         }
 536
 537         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 538
 539         /* Initiate async writes, as we can't wait for completion here */
 540         ret = smsc95xx_write_reg_async(dev, HASHH, pdata->hash_hi);
 541         if (ret < 0)
 542                 netdev_warn(dev->net, "failed to initiate async write to HASHH\n");
 543
 544         ret = smsc95xx_write_reg_async(dev, HASHL, pdata->hash_lo);
 545         if (ret < 0)
 546                 netdev_warn(dev->net, "failed to initiate async write to HASHL\n");
 547
 548         ret = smsc95xx_write_reg_async(dev, MAC_CR, pdata->mac_cr);
 549         if (ret < 0)
 550                 netdev_warn(dev->net, "failed to initiate async write to MAC_CR\n");
 551 }
 552
 553 static int smsc95xx_phy_update_flowcontrol(struct usbnet *dev)
 554 {
 555         u32 flow = 0, afc_cfg;
 556         struct smsc95xx_priv *pdata = dev->driver_priv;
 557         bool tx_pause, rx_pause;
 558
 559         int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
 560         if (ret < 0)
 561                 return ret;
 562
 563         if (pdata->phydev->duplex == DUPLEX_FULL) {
 564                 phy_get_pause(pdata->phydev, &tx_pause, &rx_pause);
 565
 566                 if (rx_pause)
 567                         flow = 0xFFFF0002;
 568
 569                 if (tx_pause) {
 570                         afc_cfg |= 0xF;
 571                         flow |= 0xFFFF0000;
 572                 } else {
 573                         afc_cfg &= ~0xF;
 574                 }
 575
 576                 netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
 577                           rx_pause ? "enabled" : "disabled",
 578                           tx_pause ? "enabled" : "disabled");
 579         } else {
 580                 netif_dbg(dev, link, dev->net, "half duplex\n");
 581                 afc_cfg |= 0xF;
 582         }
 583
 584         ret = smsc95xx_write_reg(dev, FLOW, flow);
 585         if (ret < 0)
 586                 return ret;
 587
 588         return smsc95xx_write_reg(dev, AFC_CFG, afc_cfg);
 589 }
 590
 591 static void smsc95xx_mac_update_fullduplex(struct usbnet *dev)
 592 {
 593         struct smsc95xx_priv *pdata = dev->driver_priv;
 594         unsigned long flags;
 595         int ret;
 596
 597         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 598         if (pdata->phydev->duplex != DUPLEX_FULL) {
 599                 pdata->mac_cr &= ~MAC_CR_FDPX_;
 600                 pdata->mac_cr |= MAC_CR_RCVOWN_;
 601         } else {
 602                 pdata->mac_cr &= ~MAC_CR_RCVOWN_;
 603                 pdata->mac_cr |= MAC_CR_FDPX_;
 604         }
 605         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 606
 607         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 608         if (ret < 0) {
 609                 if (ret != -ENODEV)
 610                         netdev_warn(dev->net,
 611                                     "Error updating MAC full duplex mode\n");
 612                 return;
 613         }
 614
 615         ret = smsc95xx_phy_update_flowcontrol(dev);
 616         if (ret < 0)
 617                 netdev_warn(dev->net, "Error updating PHY flow control\n");
 618 }
 619
 620 static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
 621 {
 622         struct smsc95xx_priv *pdata = dev->driver_priv;
 623         unsigned long flags;
 624         u32 intdata;
 625
 626         if (urb->actual_length != 4) {
 627                 netdev_warn(dev->net, "unexpected urb length %d\n",
 628                             urb->actual_length);
 629                 return;
 630         }
 631
 632         intdata = get_unaligned_le32(urb->transfer_buffer);
 633         netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
 634
 635         local_irq_save(flags);
 636
 637         if (intdata & INT_ENP_PHY_INT_)
 638                 generic_handle_domain_irq(pdata->irqdomain, PHY_HWIRQ);
 639         else
 640                 netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
 641                             intdata);
 642
 643         local_irq_restore(flags);
 644 }
 645
 646 /* Enable or disable Tx & Rx checksum offload engines */
 647 static int smsc95xx_set_features(struct net_device *netdev,
 648         netdev_features_t features)
 649 {
 650         struct usbnet *dev = netdev_priv(netdev);
 651         u32 read_buf;
 652         int ret;
 653
 654         ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
 655         if (ret < 0)
 656                 return ret;
 657
 658         if (features & NETIF_F_IP_CSUM)
 659                 read_buf |= Tx_COE_EN_;
 660         else
 661                 read_buf &= ~Tx_COE_EN_;
 662
 663         if (features & NETIF_F_RXCSUM)
 664                 read_buf |= Rx_COE_EN_;
 665         else
 666                 read_buf &= ~Rx_COE_EN_;
 667
 668         ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
 669         if (ret < 0)
 670                 return ret;
 671
 672         netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
 673         return 0;
 674 }
 675
 676 static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
 677 {
 678         return MAX_EEPROM_SIZE;
 679 }
 680
 681 static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
 682                                        struct ethtool_eeprom *ee, u8 *data)
 683 {
 684         struct usbnet *dev = netdev_priv(netdev);
 685
 686         ee->magic = LAN95XX_EEPROM_MAGIC;
 687
 688         return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
 689 }
 690
 691 static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
 692                                        struct ethtool_eeprom *ee, u8 *data)
 693 {
 694         struct usbnet *dev = netdev_priv(netdev);
 695
 696         if (ee->magic != LAN95XX_EEPROM_MAGIC) {
 697                 netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
 698                             ee->magic);
 699                 return -EINVAL;
 700         }
 701
 702         return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
 703 }
 704
 705 static int smsc95xx_ethtool_getregslen(struct net_device *netdev)
 706 {
 707         /* all smsc95xx registers */
 708         return COE_CR - ID_REV + sizeof(u32);
 709 }
 710
 711 static void
 712 smsc95xx_ethtool_getregs(struct net_device *netdev, struct ethtool_regs *regs,
 713                          void *buf)
 714 {
 715         struct usbnet *dev = netdev_priv(netdev);
 716         unsigned int i, j;
 717         int retval;
 718         u32 *data = buf;
 719
 720         retval = smsc95xx_read_reg(dev, ID_REV, &regs->version);
 721         if (retval < 0) {
 722                 netdev_warn(netdev, "REGS: cannot read ID_REV\n");
 723                 return;
 724         }
 725
 726         for (i = ID_REV, j = 0; i <= COE_CR; i += (sizeof(u32)), j++) {
 727                 retval = smsc95xx_read_reg(dev, i, &data[j]);
 728                 if (retval < 0) {
 729                         netdev_warn(netdev, "REGS: cannot read reg[%x]\n", i);
 730                         return;
 731                 }
 732         }
 733 }
 734
 735 static void smsc95xx_ethtool_get_wol(struct net_device *net,
 736                                      struct ethtool_wolinfo *wolinfo)
 737 {
 738         struct usbnet *dev = netdev_priv(net);
 739         struct smsc95xx_priv *pdata = dev->driver_priv;
 740
 741         wolinfo->supported = SUPPORTED_WAKE;
 742         wolinfo->wolopts = pdata->wolopts;
 743 }
 744
 745 static int smsc95xx_ethtool_set_wol(struct net_device *net,
 746                                     struct ethtool_wolinfo *wolinfo)
 747 {
 748         struct usbnet *dev = netdev_priv(net);
 749         struct smsc95xx_priv *pdata = dev->driver_priv;
 750         int ret;
 751
 752         if (wolinfo->wolopts & ~SUPPORTED_WAKE)
 753                 return -EINVAL;
 754
 755         pdata->wolopts = wolinfo->wolopts & SUPPORTED_WAKE;
 756
 757         ret = device_set_wakeup_enable(&dev->udev->dev, pdata->wolopts);
 758         if (ret < 0)
 759                 netdev_warn(dev->net, "device_set_wakeup_enable error %d\n", ret);
 760
 761         return ret;
 762 }
 763
 764 static u32 smsc95xx_get_link(struct net_device *net)
 765 {
 766         phy_read_status(net->phydev);
 767         return net->phydev->link;
 768 }
 769
 770 static const struct ethtool_ops smsc95xx_ethtool_ops = {
 771         .get_link       = smsc95xx_get_link,
 772         .nway_reset     = phy_ethtool_nway_reset,
 773         .get_drvinfo    = usbnet_get_drvinfo,
 774         .get_msglevel   = usbnet_get_msglevel,
 775         .set_msglevel   = usbnet_set_msglevel,
 776         .get_eeprom_len = smsc95xx_ethtool_get_eeprom_len,
 777         .get_eeprom     = smsc95xx_ethtool_get_eeprom,
 778         .set_eeprom     = smsc95xx_ethtool_set_eeprom,
 779         .get_regs_len   = smsc95xx_ethtool_getregslen,
 780         .get_regs       = smsc95xx_ethtool_getregs,
 781         .get_wol        = smsc95xx_ethtool_get_wol,
 782         .set_wol        = smsc95xx_ethtool_set_wol,
 783         .get_link_ksettings     = phy_ethtool_get_link_ksettings,
 784         .set_link_ksettings     = phy_ethtool_set_link_ksettings,
 785         .get_ts_info    = ethtool_op_get_ts_info,
 786 };
 787
 788 static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
 789 {
 790         if (!netif_running(netdev))
 791                 return -EINVAL;
 792
 793         return phy_mii_ioctl(netdev->phydev, rq, cmd);
 794 }
 795
 796 /* Check the macaddr module parameter for a MAC address */
 797 static int smsc95xx_is_macaddr_param(struct usbnet *dev, u8 *dev_mac)
 798 {
 799        int i, j, got_num, num;
 800        u8 mtbl[MAC_ADDR_LEN];
 801
 802        if (macaddr[0] == ':')
 803                return 0;
 804
 805        i = 0;
 806        j = 0;
 807        num = 0;
 808        got_num = 0;
 809        while (j < MAC_ADDR_LEN) {
 810                if (macaddr[i] && macaddr[i] != ':') {
 811                        got_num++;
 812                        if ('0' <= macaddr[i] && macaddr[i] <= '9')
 813                                num = num * 16 + macaddr[i] - '0';
 814                        else if ('A' <= macaddr[i] && macaddr[i] <= 'F')
 815                                num = num * 16 + 10 + macaddr[i] - 'A';
 816                        else if ('a' <= macaddr[i] && macaddr[i] <= 'f')
 817                                num = num * 16 + 10 + macaddr[i] - 'a';
 818                        else
 819                                break;
 820                        i++;
 821                } else if (got_num == 2) {
 822                        mtbl[j++] = (u8) num;
 823                        num = 0;
 824                        got_num = 0;
 825                        i++;
 826                } else {
 827                        break;
 828                }
 829        }
 830
 831        if (j == MAC_ADDR_LEN) {
 832                netif_dbg(dev, ifup, dev->net, "Overriding MAC address with: "
 833                "%02x:%02x:%02x:%02x:%02x:%02x\n", mtbl[0], mtbl[1], mtbl[2],
 834                                                mtbl[3], mtbl[4], mtbl[5]);
 835                for (i = 0; i < MAC_ADDR_LEN; i++)
 836                        dev_mac[i] = mtbl[i];
 837                return 1;
 838        } else {
 839                return 0;
 840        }
 841 }
 842
 843 static void smsc95xx_init_mac_address(struct usbnet *dev)
 844 {
 845         /* maybe the boot loader passed the MAC address in devicetree */
 846         if (!eth_platform_get_mac_address(&dev->udev->dev,
 847                         dev->net->dev_addr)) {
 848                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 849                         /* device tree values are valid so use them */
 850                         netif_dbg(dev, ifup, dev->net, "MAC address read from the device tree\n");
 851                         return;
 852                 }
 853         }
 854
 855         /* try reading mac address from EEPROM */
 856         if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
 857                         dev->net->dev_addr) == 0) {
 858                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 859                         /* eeprom values are valid so use them */
 860                         netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
 861                         return;
 862                 }
 863         }
 864
 865         /* Check module parameters */
 866         if (smsc95xx_is_macaddr_param(dev, dev->net->dev_addr))
 867                 return;
 868
 869         /* no useful static MAC address found. generate a random one */
 870         eth_hw_addr_random(dev->net);
 871         netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
 872 }
 873
 874 static int smsc95xx_set_mac_address(struct usbnet *dev)
 875 {
 876         u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
 877                 dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
 878         u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
 879         int ret;
 880
 881         ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
 882         if (ret < 0)
 883                 return ret;
 884
 885         return smsc95xx_write_reg(dev, ADDRH, addr_hi);
 886 }
 887
 888 /* starts the TX path */
 889 static int smsc95xx_start_tx_path(struct usbnet *dev)
 890 {
 891         struct smsc95xx_priv *pdata = dev->driver_priv;
 892         unsigned long flags;
 893         int ret;
 894
 895         /* Enable Tx at MAC */
 896         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 897         pdata->mac_cr |= MAC_CR_TXEN_;
 898         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 899
 900         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 901         if (ret < 0)
 902                 return ret;
 903
 904         /* Enable Tx at SCSRs */
 905         return smsc95xx_write_reg(dev, TX_CFG, TX_CFG_ON_);
 906 }
 907
 908 /* Starts the Receive path */
 909 static int smsc95xx_start_rx_path(struct usbnet *dev, int in_pm)
 910 {
 911         struct smsc95xx_priv *pdata = dev->driver_priv;
 912         unsigned long flags;
 913
 914         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 915         pdata->mac_cr |= MAC_CR_RXEN_;
 916         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 917
 918         return __smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr, in_pm);
 919 }
 920
 921 static int smsc95xx_reset(struct usbnet *dev)
 922 {
 923         struct smsc95xx_priv *pdata = dev->driver_priv;
 924         u32 read_buf, write_buf, burst_cap;
 925         int ret = 0, timeout;
 926
 927         netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
 928
 929         ret = smsc95xx_write_reg(dev, HW_CFG, HW_CFG_LRST_);
 930         if (ret < 0)
 931                 return ret;
 932
 933         timeout = 0;
 934         do {
 935                 msleep(10);
 936                 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 937                 if (ret < 0)
 938                         return ret;
 939                 timeout++;
 940         } while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
 941
 942         if (timeout >= 100) {
 943                 netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
 944                 return ret;
 945         }
 946
 947         ret = smsc95xx_write_reg(dev, PM_CTRL, PM_CTL_PHY_RST_);
 948         if (ret < 0)
 949                 return ret;
 950
 951         timeout = 0;
 952         do {
 953                 msleep(10);
 954                 ret = smsc95xx_read_reg(dev, PM_CTRL, &read_buf);
 955                 if (ret < 0)
 956                         return ret;
 957                 timeout++;
 958         } while ((read_buf & PM_CTL_PHY_RST_) && (timeout < 100));
 959
 960         if (timeout >= 100) {
 961                 netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
 962                 return ret;
 963         }
 964
 965         ret = smsc95xx_set_mac_address(dev);
 966         if (ret < 0)
 967                 return ret;
 968
 969         netif_dbg(dev, ifup, dev->net, "MAC Address: %pM\n",
 970                   dev->net->dev_addr);
 971
 972         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 973         if (ret < 0)
 974                 return ret;
 975
 976         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x\n",
 977                   read_buf);
 978
 979         read_buf |= HW_CFG_BIR_;
 980
 981         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 982         if (ret < 0)
 983                 return ret;
 984
 985         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 986         if (ret < 0)
 987                 return ret;
 988
 989         netif_dbg(dev, ifup, dev->net,
 990                   "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
 991                   read_buf);
 992
 993         if (!turbo_mode) {
 994                 burst_cap = 0;
 995                 dev->rx_urb_size = packetsize ? packetsize : MAX_SINGLE_PACKET_SIZE;
 996         } else if (dev->udev->speed == USB_SPEED_HIGH) {
 997                 dev->rx_urb_size = packetsize ? packetsize : DEFAULT_HS_BURST_CAP_SIZE;
 998                 burst_cap = dev->rx_urb_size / HS_USB_PKT_SIZE;
 999         } else {
1000                 dev->rx_urb_size = packetsize ? packetsize : DEFAULT_FS_BURST_CAP_SIZE;
1001                 burst_cap = dev->rx_urb_size / FS_USB_PKT_SIZE;
1002         }
1003
1004         netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld\n",
1005                   (ulong)dev->rx_urb_size);
1006
1007         ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
1008         if (ret < 0)
1009                 return ret;
1010
1011         ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
1012         if (ret < 0)
1013                 return ret;
1014
1015         netif_dbg(dev, ifup, dev->net,
1016                   "Read Value from BURST_CAP after writing: 0x%08x\n",
1017                   read_buf);
1018
1019         ret = smsc95xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
1020         if (ret < 0)
1021                 return ret;
1022
1023         ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
1024         if (ret < 0)
1025                 return ret;
1026
1027         netif_dbg(dev, ifup, dev->net,
1028                   "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
1029                   read_buf);
1030
1031         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
1032         if (ret < 0)
1033                 return ret;
1034
1035         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG: 0x%08x\n",
1036                   read_buf);
1037
1038         if (turbo_mode)
1039                 read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
1040
1041         read_buf &= ~HW_CFG_RXDOFF_;
1042
1043         /* set Rx data offset=2, Make IP header aligns on word boundary. */
1044         read_buf |= NET_IP_ALIGN << 9;
1045
1046         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
1047         if (ret < 0)
1048                 return ret;
1049
1050         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
1051         if (ret < 0)
1052                 return ret;
1053
1054         netif_dbg(dev, ifup, dev->net,
1055                   "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
1056
1057         ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
1058         if (ret < 0)
1059                 return ret;
1060
1061         ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
1062         if (ret < 0)
1063                 return ret;
1064         netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
1065
1066         /* Configure GPIO pins as LED outputs */
1067         write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
1068                 LED_GPIO_CFG_FDX_LED;
1069         ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
1070         if (ret < 0)
1071                 return ret;
1072
1073         /* Init Tx */
1074         ret = smsc95xx_write_reg(dev, FLOW, 0);
1075         if (ret < 0)
1076                 return ret;
1077
1078         ret = smsc95xx_write_reg(dev, AFC_CFG, AFC_CFG_DEFAULT);
1079         if (ret < 0)
1080                 return ret;
1081
1082         /* Don't need mac_cr_lock during initialisation */
1083         ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
1084         if (ret < 0)
1085                 return ret;
1086
1087         /* Init Rx */
1088         /* Set Vlan */
1089         ret = smsc95xx_write_reg(dev, VLAN1, (u32)ETH_P_8021Q);
1090         if (ret < 0)
1091                 return ret;
1092
1093         /* Enable or disable checksum offload engines */
1094         ret = smsc95xx_set_features(dev->net, dev->net->features);
1095         if (ret < 0) {
1096                 netdev_warn(dev->net, "Failed to set checksum offload features\n");
1097                 return ret;
1098         }
1099
1100         smsc95xx_set_multicast(dev->net);
1101
1102         ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
1103         if (ret < 0)
1104                 return ret;
1105
1106         /* enable PHY interrupts */
1107         read_buf |= INT_EP_CTL_PHY_INT_;
1108
1109         ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
1110         if (ret < 0)
1111                 return ret;
1112
1113         ret = smsc95xx_start_tx_path(dev);
1114         if (ret < 0) {
1115                 netdev_warn(dev->net, "Failed to start TX path\n");
1116                 return ret;
1117         }
1118
1119         ret = smsc95xx_start_rx_path(dev, 0);
1120         if (ret < 0) {
1121                 netdev_warn(dev->net, "Failed to start RX path\n");
1122                 return ret;
1123         }
1124
1125         netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1126         return 0;
1127 }
1128
1129 static const struct net_device_ops smsc95xx_netdev_ops = {
1130         .ndo_open               = usbnet_open,
1131         .ndo_stop               = usbnet_stop,
1132         .ndo_start_xmit         = usbnet_start_xmit,
1133         .ndo_tx_timeout         = usbnet_tx_timeout,
1134         .ndo_change_mtu         = usbnet_change_mtu,
1135         .ndo_get_stats64        = dev_get_tstats64,
1136         .ndo_set_mac_address    = eth_mac_addr,
1137         .ndo_validate_addr      = eth_validate_addr,
1138         .ndo_eth_ioctl          = smsc95xx_ioctl,
1139         .ndo_set_rx_mode        = smsc95xx_set_multicast,
1140         .ndo_set_features       = smsc95xx_set_features,
1141 };
1142
1143 static void smsc95xx_handle_link_change(struct net_device *net)
1144 {
1145         struct usbnet *dev = netdev_priv(net);
1146
1147         phy_print_status(net->phydev);
1148         smsc95xx_mac_update_fullduplex(dev);
1149         usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1150 }
1151
1152 static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1153 {
1154         struct smsc95xx_priv *pdata;
1155         bool is_internal_phy;
1156         char usb_path[64];
1157         int ret, phy_irq;
1158         u32 val;
1159
1160         printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1161
1162         ret = usbnet_get_endpoints(dev, intf);
1163         if (ret < 0) {
1164                 netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1165                 return ret;
1166         }
1167
1168         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
1169         if (!pdata)
1170                 return -ENOMEM;
1171
1172         dev->driver_priv = pdata;
1173
1174         spin_lock_init(&pdata->mac_cr_lock);
1175
1176         /* LAN95xx devices do not alter the computed checksum of 0 to 0xffff.
1177          * RFC 2460, ipv6 UDP calculated checksum yields a result of zero must
1178          * be changed to 0xffff. RFC 768, ipv4 UDP computed checksum is zero,
1179          * it is transmitted as all ones. The zero transmitted checksum means
1180          * transmitter generated no checksum. Hence, enable csum offload only
1181          * for ipv4 packets.
1182          */
1183         if (DEFAULT_TX_CSUM_ENABLE)
1184                 dev->net->features |= NETIF_F_IP_CSUM;
1185         if (DEFAULT_RX_CSUM_ENABLE)
1186                 dev->net->features |= NETIF_F_RXCSUM;
1187
1188         dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1189         set_bit(EVENT_NO_IP_ALIGN, &dev->flags);
1190
1191         smsc95xx_init_mac_address(dev);
1192
1193         /* Init all registers */
1194         ret = smsc95xx_reset(dev);
1195         if (ret)
1196                 goto free_pdata;
1197
1198         /* create irq domain for use by PHY driver and GPIO consumers */
1199         usb_make_path(dev->udev, usb_path, sizeof(usb_path));
1200         pdata->irqfwnode = irq_domain_alloc_named_fwnode(usb_path);
1201         if (!pdata->irqfwnode) {
1202                 ret = -ENOMEM;
1203                 goto free_pdata;
1204         }
1205
1206         pdata->irqdomain = irq_domain_create_linear(pdata->irqfwnode,
1207                                                     SMSC95XX_NR_IRQS,
1208                                                     &irq_domain_simple_ops,
1209                                                     pdata);
1210         if (!pdata->irqdomain) {
1211                 ret = -ENOMEM;
1212                 goto free_irqfwnode;
1213         }
1214
1215         phy_irq = irq_create_mapping(pdata->irqdomain, PHY_HWIRQ);
1216         if (!phy_irq) {
1217                 ret = -ENOENT;
1218                 goto remove_irqdomain;
1219         }
1220
1221         pdata->irqchip = dummy_irq_chip;
1222         pdata->irqchip.name = SMSC_CHIPNAME;
1223         irq_set_chip_and_handler_name(phy_irq, &pdata->irqchip,
1224                                       handle_simple_irq, "phy");
1225
1226         pdata->mdiobus = mdiobus_alloc();
1227         if (!pdata->mdiobus) {
1228                 ret = -ENOMEM;
1229                 goto dispose_irq;
1230         }
1231
1232         ret = smsc95xx_read_reg(dev, HW_CFG, &val);
1233         if (ret < 0)
1234                 goto free_mdio;
1235
1236         is_internal_phy = !(val & HW_CFG_PSEL_);
1237         if (is_internal_phy)
1238                 pdata->mdiobus->phy_mask = ~(1u << SMSC95XX_INTERNAL_PHY_ID);
1239
1240         pdata->mdiobus->priv = dev;
1241         pdata->mdiobus->read = smsc95xx_mdiobus_read;
1242         pdata->mdiobus->write = smsc95xx_mdiobus_write;
1243         pdata->mdiobus->name = "smsc95xx-mdiobus";
1244         pdata->mdiobus->parent = &dev->udev->dev;
1245
1246         snprintf(pdata->mdiobus->id, ARRAY_SIZE(pdata->mdiobus->id),
1247                  "usb-%03d:%03d", dev->udev->bus->busnum, dev->udev->devnum);
1248
1249         ret = mdiobus_register(pdata->mdiobus);
1250         if (ret) {
1251                 netdev_err(dev->net, "Could not register MDIO bus\n");
1252                 goto free_mdio;
1253         }
1254
1255         pdata->phydev = phy_find_first(pdata->mdiobus);
1256         if (!pdata->phydev) {
1257                 netdev_err(dev->net, "no PHY found\n");
1258                 ret = -ENODEV;
1259                 goto unregister_mdio;
1260         }
1261
1262         pdata->phydev->irq = phy_irq;
1263         pdata->phydev->is_internal = is_internal_phy;
1264
1265         /* detect device revision as different features may be available */
1266         ret = smsc95xx_read_reg(dev, ID_REV, &val);
1267         if (ret < 0)
1268                 goto unregister_mdio;
1269
1270         val >>= 16;
1271         if ((val == ID_REV_CHIP_ID_9500A_) || (val == ID_REV_CHIP_ID_9530_) ||
1272             (val == ID_REV_CHIP_ID_89530_) || (val == ID_REV_CHIP_ID_9730_))
1273                 pdata->features = (FEATURE_8_WAKEUP_FILTERS |
1274                         FEATURE_PHY_NLP_CROSSOVER |
1275                         FEATURE_REMOTE_WAKEUP);
1276         else if (val == ID_REV_CHIP_ID_9512_)
1277                 pdata->features = FEATURE_8_WAKEUP_FILTERS;
1278
1279         dev->net->netdev_ops = &smsc95xx_netdev_ops;
1280         dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1281         dev->net->flags |= IFF_MULTICAST;
1282         dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
1283         dev->net->min_mtu = ETH_MIN_MTU;
1284         dev->net->max_mtu = ETH_DATA_LEN;
1285         dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
1286
1287         ret = phy_connect_direct(dev->net, pdata->phydev,
1288                                  &smsc95xx_handle_link_change,
1289                                  PHY_INTERFACE_MODE_MII);
1290         if (ret) {
1291                 netdev_err(dev->net, "can't attach PHY to %s\n", pdata->mdiobus->id);
1292                 goto unregister_mdio;
1293         }
1294
1295         phy_attached_info(dev->net->phydev);
1296
1297         return 0;
1298
1299 unregister_mdio:
1300         mdiobus_unregister(pdata->mdiobus);
1301
1302 free_mdio:
1303         mdiobus_free(pdata->mdiobus);
1304
1305 dispose_irq:
1306         irq_dispose_mapping(phy_irq);
1307
1308 remove_irqdomain:
1309         irq_domain_remove(pdata->irqdomain);
1310
1311 free_irqfwnode:
1312         irq_domain_free_fwnode(pdata->irqfwnode);
1313
1314 free_pdata:
1315         kfree(pdata);
1316         return ret;
1317 }
1318
1319 static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1320 {
1321         struct smsc95xx_priv *pdata = dev->driver_priv;
1322
1323         phy_disconnect(dev->net->phydev);
1324         mdiobus_unregister(pdata->mdiobus);
1325         mdiobus_free(pdata->mdiobus);
1326         irq_dispose_mapping(irq_find_mapping(pdata->irqdomain, PHY_HWIRQ));
1327         irq_domain_remove(pdata->irqdomain);
1328         irq_domain_free_fwnode(pdata->irqfwnode);
1329         netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1330         kfree(pdata);
1331 }
1332
1333 static int smsc95xx_start_phy(struct usbnet *dev)
1334 {
1335         phy_start(dev->net->phydev);
1336
1337         return 0;
1338 }
1339
1340 static int smsc95xx_stop(struct usbnet *dev)
1341 {
1342         phy_stop(dev->net->phydev);
1343
1344         return 0;
1345 }
1346
1347 static u32 smsc_crc(const u8 *buffer, size_t len, int filter)
1348 {
1349         u32 crc = bitrev16(crc16(0xFFFF, buffer, len));
1350         return crc << ((filter % 2) * 16);
1351 }
1352
1353 static int smsc95xx_link_ok_nopm(struct usbnet *dev)
1354 {
1355         int ret;
1356
1357         /* first, a dummy read, needed to latch some MII phys */
1358         ret = smsc95xx_mdio_read_nopm(dev, MII_BMSR);
1359         if (ret < 0)
1360                 return ret;
1361
1362         ret = smsc95xx_mdio_read_nopm(dev, MII_BMSR);
1363         if (ret < 0)
1364                 return ret;
1365
1366         return !!(ret & BMSR_LSTATUS);
1367 }
1368
1369 static int smsc95xx_enter_suspend0(struct usbnet *dev)
1370 {
1371         struct smsc95xx_priv *pdata = dev->driver_priv;
1372         u32 val;
1373         int ret;
1374
1375         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1376         if (ret < 0)
1377                 return ret;
1378
1379         val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
1380         val |= PM_CTL_SUS_MODE_0;
1381
1382         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1383         if (ret < 0)
1384                 return ret;
1385
1386         /* clear wol status */
1387         val &= ~PM_CTL_WUPS_;
1388         val |= PM_CTL_WUPS_WOL_;
1389
1390         /* enable energy detection */
1391         if (pdata->wolopts & WAKE_PHY)
1392                 val |= PM_CTL_WUPS_ED_;
1393
1394         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1395         if (ret < 0)
1396                 return ret;
1397
1398         /* read back PM_CTRL */
1399         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1400         if (ret < 0)
1401                 return ret;
1402
1403         pdata->suspend_flags |= SUSPEND_SUSPEND0;
1404
1405         return 0;
1406 }
1407
1408 static int smsc95xx_enter_suspend1(struct usbnet *dev)
1409 {
1410         struct smsc95xx_priv *pdata = dev->driver_priv;
1411         u32 val;
1412         int ret;
1413
1414         /* reconfigure link pulse detection timing for
1415          * compatibility with non-standard link partners
1416          */
1417         if (pdata->features & FEATURE_PHY_NLP_CROSSOVER)
1418                 smsc95xx_mdio_write_nopm(dev, PHY_EDPD_CONFIG,
1419                                          PHY_EDPD_CONFIG_DEFAULT);
1420
1421         /* enable energy detect power-down mode */
1422         ret = smsc95xx_mdio_read_nopm(dev, PHY_MODE_CTRL_STS);
1423         if (ret < 0)
1424                 return ret;
1425
1426         ret |= MODE_CTRL_STS_EDPWRDOWN_;
1427
1428         smsc95xx_mdio_write_nopm(dev, PHY_MODE_CTRL_STS, ret);
1429
1430         /* enter SUSPEND1 mode */
1431         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1432         if (ret < 0)
1433                 return ret;
1434
1435         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1436         val |= PM_CTL_SUS_MODE_1;
1437
1438         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1439         if (ret < 0)
1440                 return ret;
1441
1442         /* clear wol status, enable energy detection */
1443         val &= ~PM_CTL_WUPS_;
1444         val |= (PM_CTL_WUPS_ED_ | PM_CTL_ED_EN_);
1445
1446         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1447         if (ret < 0)
1448                 return ret;
1449
1450         pdata->suspend_flags |= SUSPEND_SUSPEND1;
1451
1452         return 0;
1453 }
1454
1455 static int smsc95xx_enter_suspend2(struct usbnet *dev)
1456 {
1457         struct smsc95xx_priv *pdata = dev->driver_priv;
1458         u32 val;
1459         int ret;
1460
1461         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1462         if (ret < 0)
1463                 return ret;
1464
1465         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1466         val |= PM_CTL_SUS_MODE_2;
1467
1468         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1469         if (ret < 0)
1470                 return ret;
1471
1472         pdata->suspend_flags |= SUSPEND_SUSPEND2;
1473
1474         return 0;
1475 }
1476
1477 static int smsc95xx_enter_suspend3(struct usbnet *dev)
1478 {
1479         struct smsc95xx_priv *pdata = dev->driver_priv;
1480         u32 val;
1481         int ret;
1482
1483         ret = smsc95xx_read_reg_nopm(dev, RX_FIFO_INF, &val);
1484         if (ret < 0)
1485                 return ret;
1486
1487         if (val & RX_FIFO_INF_USED_) {
1488                 netdev_info(dev->net, "rx fifo not empty in autosuspend\n");
1489                 return -EBUSY;
1490         }
1491
1492         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1493         if (ret < 0)
1494                 return ret;
1495
1496         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1497         val |= PM_CTL_SUS_MODE_3 | PM_CTL_RES_CLR_WKP_STS;
1498
1499         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1500         if (ret < 0)
1501                 return ret;
1502
1503         /* clear wol status */
1504         val &= ~PM_CTL_WUPS_;
1505         val |= PM_CTL_WUPS_WOL_;
1506
1507         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1508         if (ret < 0)
1509                 return ret;
1510
1511         pdata->suspend_flags |= SUSPEND_SUSPEND3;
1512
1513         return 0;
1514 }
1515
1516 static int smsc95xx_autosuspend(struct usbnet *dev, u32 link_up)
1517 {
1518         struct smsc95xx_priv *pdata = dev->driver_priv;
1519
1520         if (!netif_running(dev->net)) {
1521                 /* interface is ifconfig down so fully power down hw */
1522                 netdev_dbg(dev->net, "autosuspend entering SUSPEND2\n");
1523                 return smsc95xx_enter_suspend2(dev);
1524         }
1525
1526         if (!link_up) {
1527                 /* link is down so enter EDPD mode, but only if device can
1528                  * reliably resume from it.  This check should be redundant
1529                  * as current FEATURE_REMOTE_WAKEUP parts also support
1530                  * FEATURE_PHY_NLP_CROSSOVER but it's included for clarity */
1531                 if (!(pdata->features & FEATURE_PHY_NLP_CROSSOVER)) {
1532                         netdev_warn(dev->net, "EDPD not supported\n");
1533                         return -EBUSY;
1534                 }
1535
1536                 netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n");
1537                 netdev_info(dev->net, "entering SUSPEND1 mode\n");
1538                 return smsc95xx_enter_suspend1(dev);
1539         }
1540
1541         netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n");
1542         return smsc95xx_enter_suspend3(dev);
1543 }
1544
1545 static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
1546 {
1547         struct usbnet *dev = usb_get_intfdata(intf);
1548         struct smsc95xx_priv *pdata = dev->driver_priv;
1549         u32 val, link_up;
1550         int ret;
1551
1552         pdata->pm_task = current;
1553
1554         ret = usbnet_suspend(intf, message);
1555         if (ret < 0) {
1556                 netdev_warn(dev->net, "usbnet_suspend error\n");
1557                 pdata->pm_task = NULL;
1558                 return ret;
1559         }
1560
1561         if (pdata->suspend_flags) {
1562                 netdev_warn(dev->net, "error during last resume\n");
1563                 pdata->suspend_flags = 0;
1564         }
1565
1566         /* determine if link is up using only _nopm functions */
1567         link_up = smsc95xx_link_ok_nopm(dev);
1568
1569         if (message.event == PM_EVENT_AUTO_SUSPEND &&
1570             (pdata->features & FEATURE_REMOTE_WAKEUP)) {
1571                 ret = smsc95xx_autosuspend(dev, link_up);
1572                 goto done;
1573         }
1574
1575         /* if we get this far we're not autosuspending */
1576         /* if no wol options set, or if link is down and we're not waking on
1577          * PHY activity, enter lowest power SUSPEND2 mode
1578          */
1579         if (!(pdata->wolopts & SUPPORTED_WAKE) ||
1580                 !(link_up || (pdata->wolopts & WAKE_PHY))) {
1581                 netdev_info(dev->net, "entering SUSPEND2 mode\n");
1582
1583                 /* disable energy detect (link up) & wake up events */
1584                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1585                 if (ret < 0)
1586                         goto done;
1587
1588                 val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
1589
1590                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1591                 if (ret < 0)
1592                         goto done;
1593
1594                 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1595                 if (ret < 0)
1596                         goto done;
1597
1598                 val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
1599
1600                 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1601                 if (ret < 0)
1602                         goto done;
1603
1604                 ret = smsc95xx_enter_suspend2(dev);
1605                 goto done;
1606         }
1607
1608         if (pdata->wolopts & WAKE_PHY) {
1609                 /* if link is down then configure EDPD and enter SUSPEND1,
1610                  * otherwise enter SUSPEND0 below
1611                  */
1612                 if (!link_up) {
1613                         netdev_info(dev->net, "entering SUSPEND1 mode\n");
1614                         ret = smsc95xx_enter_suspend1(dev);
1615                         goto done;
1616                 }
1617         }
1618
1619         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1620                 u32 *filter_mask = kcalloc(32, sizeof(u32), GFP_KERNEL);
1621                 u32 command[2];
1622                 u32 offset[2];
1623                 u32 crc[4];
1624                 int wuff_filter_count =
1625                         (pdata->features & FEATURE_8_WAKEUP_FILTERS) ?
1626                         LAN9500A_WUFF_NUM : LAN9500_WUFF_NUM;
1627                 int i, filter = 0;
1628
1629                 if (!filter_mask) {
1630                         netdev_warn(dev->net, "Unable to allocate filter_mask\n");
1631                         ret = -ENOMEM;
1632                         goto done;
1633                 }
1634
1635                 memset(command, 0, sizeof(command));
1636                 memset(offset, 0, sizeof(offset));
1637                 memset(crc, 0, sizeof(crc));
1638
1639                 if (pdata->wolopts & WAKE_BCAST) {
1640                         const u8 bcast[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
1641                         netdev_info(dev->net, "enabling broadcast detection\n");
1642                         filter_mask[filter * 4] = 0x003F;
1643                         filter_mask[filter * 4 + 1] = 0x00;
1644                         filter_mask[filter * 4 + 2] = 0x00;
1645                         filter_mask[filter * 4 + 3] = 0x00;
1646                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1647                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1648                         crc[filter/2] |= smsc_crc(bcast, 6, filter);
1649                         filter++;
1650                 }
1651
1652                 if (pdata->wolopts & WAKE_MCAST) {
1653                         const u8 mcast[] = {0x01, 0x00, 0x5E};
1654                         netdev_info(dev->net, "enabling multicast detection\n");
1655                         filter_mask[filter * 4] = 0x0007;
1656                         filter_mask[filter * 4 + 1] = 0x00;
1657                         filter_mask[filter * 4 + 2] = 0x00;
1658                         filter_mask[filter * 4 + 3] = 0x00;
1659                         command[filter/4] |= 0x09UL << ((filter % 4) * 8);
1660                         offset[filter/4] |= 0x00  << ((filter % 4) * 8);
1661                         crc[filter/2] |= smsc_crc(mcast, 3, filter);
1662                         filter++;
1663                 }
1664
1665                 if (pdata->wolopts & WAKE_ARP) {
1666                         const u8 arp[] = {0x08, 0x06};
1667                         netdev_info(dev->net, "enabling ARP detection\n");
1668                         filter_mask[filter * 4] = 0x0003;
1669                         filter_mask[filter * 4 + 1] = 0x00;
1670                         filter_mask[filter * 4 + 2] = 0x00;
1671                         filter_mask[filter * 4 + 3] = 0x00;
1672                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1673                         offset[filter/4] |= 0x0C << ((filter % 4) * 8);
1674                         crc[filter/2] |= smsc_crc(arp, 2, filter);
1675                         filter++;
1676                 }
1677
1678                 if (pdata->wolopts & WAKE_UCAST) {
1679                         netdev_info(dev->net, "enabling unicast detection\n");
1680                         filter_mask[filter * 4] = 0x003F;
1681                         filter_mask[filter * 4 + 1] = 0x00;
1682                         filter_mask[filter * 4 + 2] = 0x00;
1683                         filter_mask[filter * 4 + 3] = 0x00;
1684                         command[filter/4] |= 0x01UL << ((filter % 4) * 8);
1685                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1686                         crc[filter/2] |= smsc_crc(dev->net->dev_addr, ETH_ALEN, filter);
1687                         filter++;
1688                 }
1689
1690                 for (i = 0; i < (wuff_filter_count * 4); i++) {
1691                         ret = smsc95xx_write_reg_nopm(dev, WUFF, filter_mask[i]);
1692                         if (ret < 0) {
1693                                 kfree(filter_mask);
1694                                 goto done;
1695                         }
1696                 }
1697                 kfree(filter_mask);
1698
1699                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1700                         ret = smsc95xx_write_reg_nopm(dev, WUFF, command[i]);
1701                         if (ret < 0)
1702                                 goto done;
1703                 }
1704
1705                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1706                         ret = smsc95xx_write_reg_nopm(dev, WUFF, offset[i]);
1707                         if (ret < 0)
1708                                 goto done;
1709                 }
1710
1711                 for (i = 0; i < (wuff_filter_count / 2); i++) {
1712                         ret = smsc95xx_write_reg_nopm(dev, WUFF, crc[i]);
1713                         if (ret < 0)
1714                                 goto done;
1715                 }
1716
1717                 /* clear any pending pattern match packet status */
1718                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1719                 if (ret < 0)
1720                         goto done;
1721
1722                 val |= WUCSR_WUFR_;
1723
1724                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1725                 if (ret < 0)
1726                         goto done;
1727         }
1728
1729         if (pdata->wolopts & WAKE_MAGIC) {
1730                 /* clear any pending magic packet status */
1731                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1732                 if (ret < 0)
1733                         goto done;
1734
1735                 val |= WUCSR_MPR_;
1736
1737                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1738                 if (ret < 0)
1739                         goto done;
1740         }
1741
1742         /* enable/disable wakeup sources */
1743         ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1744         if (ret < 0)
1745                 goto done;
1746
1747         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1748                 netdev_info(dev->net, "enabling pattern match wakeup\n");
1749                 val |= WUCSR_WAKE_EN_;
1750         } else {
1751                 netdev_info(dev->net, "disabling pattern match wakeup\n");
1752                 val &= ~WUCSR_WAKE_EN_;
1753         }
1754
1755         if (pdata->wolopts & WAKE_MAGIC) {
1756                 netdev_info(dev->net, "enabling magic packet wakeup\n");
1757                 val |= WUCSR_MPEN_;
1758         } else {
1759                 netdev_info(dev->net, "disabling magic packet wakeup\n");
1760                 val &= ~WUCSR_MPEN_;
1761         }
1762
1763         ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1764         if (ret < 0)
1765                 goto done;
1766
1767         /* enable wol wakeup source */
1768         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1769         if (ret < 0)
1770                 goto done;
1771
1772         val |= PM_CTL_WOL_EN_;
1773
1774         /* phy energy detect wakeup source */
1775         if (pdata->wolopts & WAKE_PHY)
1776                 val |= PM_CTL_ED_EN_;
1777
1778         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1779         if (ret < 0)
1780                 goto done;
1781
1782         /* enable receiver to enable frame reception */
1783         smsc95xx_start_rx_path(dev, 1);
1784
1785         /* some wol options are enabled, so enter SUSPEND0 */
1786         netdev_info(dev->net, "entering SUSPEND0 mode\n");
1787         ret = smsc95xx_enter_suspend0(dev);
1788
1789 done:
1790         /*
1791          * TODO: resume() might need to handle the suspend failure
1792          * in system sleep
1793          */
1794         if (ret && PMSG_IS_AUTO(message))
1795                 usbnet_resume(intf);
1796
1797         pdata->pm_task = NULL;
1798         return ret;
1799 }
1800
1801 static int smsc95xx_resume(struct usb_interface *intf)
1802 {
1803         struct usbnet *dev = usb_get_intfdata(intf);
1804         struct smsc95xx_priv *pdata;
1805         u8 suspend_flags;
1806         int ret;
1807         u32 val;
1808
1809         BUG_ON(!dev);
1810         pdata = dev->driver_priv;
1811         suspend_flags = pdata->suspend_flags;
1812
1813         netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags);
1814
1815         /* do this first to ensure it's cleared even in error case */
1816         pdata->suspend_flags = 0;
1817
1818         pdata->pm_task = current;
1819
1820         if (suspend_flags & SUSPEND_ALLMODES) {
1821                 /* clear wake-up sources */
1822                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1823                 if (ret < 0)
1824                         goto done;
1825
1826                 val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
1827
1828                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1829                 if (ret < 0)
1830                         goto done;
1831
1832                 /* clear wake-up status */
1833                 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1834                 if (ret < 0)
1835                         goto done;
1836
1837                 val &= ~PM_CTL_WOL_EN_;
1838                 val |= PM_CTL_WUPS_;
1839
1840                 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1841                 if (ret < 0)
1842                         goto done;
1843         }
1844
1845         phy_init_hw(pdata->phydev);
1846
1847         ret = usbnet_resume(intf);
1848         if (ret < 0)
1849                 netdev_warn(dev->net, "usbnet_resume error\n");
1850
1851 done:
1852         pdata->pm_task = NULL;
1853         return ret;
1854 }
1855
1856 static int smsc95xx_reset_resume(struct usb_interface *intf)
1857 {
1858         struct usbnet *dev = usb_get_intfdata(intf);
1859         struct smsc95xx_priv *pdata = dev->driver_priv;
1860         int ret;
1861
1862         pdata->pm_task = current;
1863         ret = smsc95xx_reset(dev);
1864         pdata->pm_task = NULL;
1865         if (ret < 0)
1866                 return ret;
1867
1868         return smsc95xx_resume(intf);
1869 }
1870
1871 static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1872 {
1873         skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
1874         skb->ip_summed = CHECKSUM_COMPLETE;
1875         skb_trim(skb, skb->len - 2);
1876 }
1877
1878 static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1879 {
1880         /* This check is no longer done by usbnet */
1881         if (skb->len < dev->net->hard_header_len)
1882                 return 0;
1883
1884         while (skb->len > 0) {
1885                 u32 header, align_count;
1886                 struct sk_buff *ax_skb;
1887                 unsigned char *packet;
1888                 u16 size;
1889
1890                 header = get_unaligned_le32(skb->data);
1891                 skb_pull(skb, 4 + NET_IP_ALIGN);
1892                 packet = skb->data;
1893
1894                 /* get the packet length */
1895                 size = (u16)((header & RX_STS_FL_) >> 16);
1896                 align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1897
1898                 if (unlikely(header & RX_STS_ES_)) {
1899                         netif_dbg(dev, rx_err, dev->net,
1900                                   "Error header=0x%08x\n", header);
1901                         dev->net->stats.rx_errors++;
1902                         dev->net->stats.rx_dropped++;
1903
1904                         if (header & RX_STS_CRC_) {
1905                                 dev->net->stats.rx_crc_errors++;
1906                         } else {
1907                                 if (header & (RX_STS_TL_ | RX_STS_RF_))
1908                                         dev->net->stats.rx_frame_errors++;
1909
1910                                 if ((header & RX_STS_LE_) &&
1911                                         (!(header & RX_STS_FT_)))
1912                                         dev->net->stats.rx_length_errors++;
1913                         }
1914                 } else {
1915                         /* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1916                         if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1917                                 netif_dbg(dev, rx_err, dev->net,
1918                                           "size err header=0x%08x\n", header);
1919                                 return 0;
1920                         }
1921
1922                         /* last frame in this batch */
1923                         if (skb->len == size) {
1924                                 if (dev->net->features & NETIF_F_RXCSUM)
1925                                         smsc95xx_rx_csum_offload(skb);
1926                                 skb_trim(skb, skb->len - 4); /* remove fcs */
1927                                 if (truesize_mode)
1928                                         skb->truesize = size + sizeof(struct sk_buff);
1929
1930                                 return 1;
1931                         }
1932
1933                         ax_skb = skb_clone(skb, GFP_ATOMIC);
1934                         if (unlikely(!ax_skb)) {
1935                                 netdev_warn(dev->net, "Error allocating skb\n");
1936                                 return 0;
1937                         }
1938
1939                         ax_skb->len = size;
1940                         ax_skb->data = packet;
1941                         skb_set_tail_pointer(ax_skb, size);
1942
1943                         if (dev->net->features & NETIF_F_RXCSUM)
1944                                 smsc95xx_rx_csum_offload(ax_skb);
1945                         skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1946                         if (truesize_mode)
1947                                 ax_skb->truesize = size + sizeof(struct sk_buff);
1948
1949                         usbnet_skb_return(dev, ax_skb);
1950                 }
1951
1952                 skb_pull(skb, size);
1953
1954                 /* padding bytes before the next frame starts */
1955                 if (skb->len)
1956                         skb_pull(skb, align_count);
1957         }
1958
1959         return 1;
1960 }
1961
1962 static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1963 {
1964         u16 low_16 = (u16)skb_checksum_start_offset(skb);
1965         u16 high_16 = low_16 + skb->csum_offset;
1966         return (high_16 << 16) | low_16;
1967 }
1968
1969 /* The TX CSUM won't work if the checksum lies in the last 4 bytes of the
1970  * transmission. This is fairly unlikely, only seems to trigger with some
1971  * short TCP ACK packets sent.
1972  *
1973  * Note, this calculation should probably check for the alignment of the
1974  * data as well, but a straight check for csum being in the last four bytes
1975  * of the packet should be ok for now.
1976  */
1977 static bool smsc95xx_can_tx_checksum(struct sk_buff *skb)
1978 {
1979        unsigned int len = skb->len - skb_checksum_start_offset(skb);
1980
1981        if (skb->len <= 45)
1982                return false;
1983        return skb->csum_offset < (len - (4 + 1));
1984 }
1985
1986 static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1987                                          struct sk_buff *skb, gfp_t flags)
1988 {
1989         bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
1990         int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
1991         u32 tx_cmd_a, tx_cmd_b;
1992         void *ptr;
1993
1994         /* We do not advertise SG, so skbs should be already linearized */
1995         BUG_ON(skb_shinfo(skb)->nr_frags);
1996
1997         /* Make writable and expand header space by overhead if required */
1998         if (skb_cow_head(skb, overhead)) {
1999                 /* Must deallocate here as returning NULL to indicate error
2000                  * means the skb won't be deallocated in the caller.
2001                  */
2002                 dev_kfree_skb_any(skb);
2003                 return NULL;
2004         }
2005
2006         tx_cmd_b = (u32)skb->len;
2007         tx_cmd_a = tx_cmd_b | TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
2008
2009         if (csum) {
2010                 if (!smsc95xx_can_tx_checksum(skb)) {
2011                         /* workaround - hardware tx checksum does not work
2012                          * properly with extremely small packets */
2013                         long csstart = skb_checksum_start_offset(skb);
2014                         __wsum calc = csum_partial(skb->data + csstart,
2015                                 skb->len - csstart, 0);
2016                         *((__sum16 *)(skb->data + csstart
2017                                 + skb->csum_offset)) = csum_fold(calc);
2018
2019                         csum = false;
2020                 } else {
2021                         u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
2022                         ptr = skb_push(skb, 4);
2023                         put_unaligned_le32(csum_preamble, ptr);
2024
2025                         tx_cmd_a += 4;
2026                         tx_cmd_b += 4;
2027                         tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
2028                 }
2029         }
2030
2031         ptr = skb_push(skb, 8);
2032         put_unaligned_le32(tx_cmd_a, ptr);
2033         put_unaligned_le32(tx_cmd_b, ptr+4);
2034
2035         return skb;
2036 }
2037
2038 static int smsc95xx_manage_power(struct usbnet *dev, int on)
2039 {
2040         struct smsc95xx_priv *pdata = dev->driver_priv;
2041
2042         dev->intf->needs_remote_wakeup = on;
2043
2044         if (pdata->features & FEATURE_REMOTE_WAKEUP)
2045                 return 0;
2046
2047         /* this chip revision isn't capable of remote wakeup */
2048         netdev_info(dev->net, "hardware isn't capable of remote wakeup\n");
2049
2050         if (on)
2051                 usb_autopm_get_interface_no_resume(dev->intf);
2052         else
2053                 usb_autopm_put_interface(dev->intf);
2054
2055         return 0;
2056 }
2057
2058 static const struct driver_info smsc95xx_info = {
2059         .description    = "smsc95xx USB 2.0 Ethernet",
2060         .bind           = smsc95xx_bind,
2061         .unbind         = smsc95xx_unbind,
2062         .reset          = smsc95xx_reset,
2063         .check_connect  = smsc95xx_start_phy,
2064         .stop           = smsc95xx_stop,
2065         .rx_fixup       = smsc95xx_rx_fixup,
2066         .tx_fixup       = smsc95xx_tx_fixup,
2067         .status         = smsc95xx_status,
2068         .manage_power   = smsc95xx_manage_power,
2069         .flags          = FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
2070 };
2071
2072 static const struct usb_device_id products[] = {
2073         {
2074                 /* SMSC9500 USB Ethernet Device */
2075                 USB_DEVICE(0x0424, 0x9500),
2076                 .driver_info = (unsigned long) &smsc95xx_info,
2077         },
2078         {
2079                 /* SMSC9505 USB Ethernet Device */
2080                 USB_DEVICE(0x0424, 0x9505),
2081                 .driver_info = (unsigned long) &smsc95xx_info,
2082         },
2083         {
2084                 /* SMSC9500A USB Ethernet Device */
2085                 USB_DEVICE(0x0424, 0x9E00),
2086                 .driver_info = (unsigned long) &smsc95xx_info,
2087         },
2088         {
2089                 /* SMSC9505A USB Ethernet Device */
2090                 USB_DEVICE(0x0424, 0x9E01),
2091                 .driver_info = (unsigned long) &smsc95xx_info,
2092         },
2093         {
2094                 /* SMSC9512/9514 USB Hub & Ethernet Device */
2095                 USB_DEVICE(0x0424, 0xec00),
2096                 .driver_info = (unsigned long) &smsc95xx_info,
2097         },
2098         {
2099                 /* SMSC9500 USB Ethernet Device (SAL10) */
2100                 USB_DEVICE(0x0424, 0x9900),
2101                 .driver_info = (unsigned long) &smsc95xx_info,
2102         },
2103         {
2104                 /* SMSC9505 USB Ethernet Device (SAL10) */
2105                 USB_DEVICE(0x0424, 0x9901),
2106                 .driver_info = (unsigned long) &smsc95xx_info,
2107         },
2108         {
2109                 /* SMSC9500A USB Ethernet Device (SAL10) */
2110                 USB_DEVICE(0x0424, 0x9902),
2111                 .driver_info = (unsigned long) &smsc95xx_info,
2112         },
2113         {
2114                 /* SMSC9505A USB Ethernet Device (SAL10) */
2115                 USB_DEVICE(0x0424, 0x9903),
2116                 .driver_info = (unsigned long) &smsc95xx_info,
2117         },
2118         {
2119                 /* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
2120                 USB_DEVICE(0x0424, 0x9904),
2121                 .driver_info = (unsigned long) &smsc95xx_info,
2122         },
2123         {
2124                 /* SMSC9500A USB Ethernet Device (HAL) */
2125                 USB_DEVICE(0x0424, 0x9905),
2126                 .driver_info = (unsigned long) &smsc95xx_info,
2127         },
2128         {
2129                 /* SMSC9505A USB Ethernet Device (HAL) */
2130                 USB_DEVICE(0x0424, 0x9906),
2131                 .driver_info = (unsigned long) &smsc95xx_info,
2132         },
2133         {
2134                 /* SMSC9500 USB Ethernet Device (Alternate ID) */
2135                 USB_DEVICE(0x0424, 0x9907),
2136                 .driver_info = (unsigned long) &smsc95xx_info,
2137         },
2138         {
2139                 /* SMSC9500A USB Ethernet Device (Alternate ID) */
2140                 USB_DEVICE(0x0424, 0x9908),
2141                 .driver_info = (unsigned long) &smsc95xx_info,
2142         },
2143         {
2144                 /* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
2145                 USB_DEVICE(0x0424, 0x9909),
2146                 .driver_info = (unsigned long) &smsc95xx_info,
2147         },
2148         {
2149                 /* SMSC LAN9530 USB Ethernet Device */
2150                 USB_DEVICE(0x0424, 0x9530),
2151                 .driver_info = (unsigned long) &smsc95xx_info,
2152         },
2153         {
2154                 /* SMSC LAN9730 USB Ethernet Device */
2155                 USB_DEVICE(0x0424, 0x9730),
2156                 .driver_info = (unsigned long) &smsc95xx_info,
2157         },
2158         {
2159                 /* SMSC LAN89530 USB Ethernet Device */
2160                 USB_DEVICE(0x0424, 0x9E08),
2161                 .driver_info = (unsigned long) &smsc95xx_info,
2162         },
2163         { },            /* END */
2164 };
2165 MODULE_DEVICE_TABLE(usb, products);
2166
2167 static struct usb_driver smsc95xx_driver = {
2168         .name           = "smsc95xx",
2169         .id_table       = products,
2170         .probe          = usbnet_probe,
2171         .suspend        = smsc95xx_suspend,
2172         .resume         = smsc95xx_resume,
2173         .reset_resume   = smsc95xx_reset_resume,
2174         .disconnect     = usbnet_disconnect,
2175         .disable_hub_initiated_lpm = 1,
2176         .supports_autosuspend = 1,
2177 };
2178
2179 module_usb_driver(smsc95xx_driver);
2180
2181 MODULE_AUTHOR("Nancy Lin");
2182 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
2183 MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
2184 MODULE_LICENSE("GPL");