drivers/net/usb/asix_common.c

   1 /*
   2  * ASIX AX8817X based USB 2.0 Ethernet Devices
   3  * Copyright (C) 2003-2006 David Hollis <dhollis@davehollis.com>
   4  * Copyright (C) 2005 Phil Chang <pchang23@sbcglobal.net>
   5  * Copyright (C) 2006 James Painter <jamie.painter@iname.com>
   6  * Copyright (c) 2002-2003 TiVo Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "asix.h"
  23
  24 int asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
  25                   u16 size, void *data, int in_pm)
  26 {
  27         int ret;
  28         int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
  29
  30         BUG_ON(!dev);
  31
  32         if (!in_pm)
  33                 fn = usbnet_read_cmd;
  34         else
  35                 fn = usbnet_read_cmd_nopm;
  36
  37         ret = fn(dev, cmd, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  38                  value, index, data, size);
  39
  40         if (unlikely(ret < 0))
  41                 netdev_warn(dev->net, "Failed to read reg index 0x%04x: %d\n",
  42                             index, ret);
  43
  44         return ret;
  45 }
  46
  47 int asix_write_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
  48                    u16 size, void *data, int in_pm)
  49 {
  50         int ret;
  51         int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
  52
  53         BUG_ON(!dev);
  54
  55         if (!in_pm)
  56                 fn = usbnet_write_cmd;
  57         else
  58                 fn = usbnet_write_cmd_nopm;
  59
  60         ret = fn(dev, cmd, USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  61                  value, index, data, size);
  62
  63         if (unlikely(ret < 0))
  64                 netdev_warn(dev->net, "Failed to write reg index 0x%04x: %d\n",
  65                             index, ret);
  66
  67         return ret;
  68 }
  69
  70 void asix_write_cmd_async(struct usbnet *dev, u8 cmd, u16 value, u16 index,
  71                           u16 size, void *data)
  72 {
  73         usbnet_write_cmd_async(dev, cmd,
  74                                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  75                                value, index, data, size);
  76 }
  77
  78 int asix_rx_fixup_internal(struct usbnet *dev, struct sk_buff *skb,
  79                            struct asix_rx_fixup_info *rx)
  80 {
  81         int offset = 0;
  82         u16 size;
  83
  84         /* When an Ethernet frame spans multiple URB socket buffers,
  85          * do a sanity test for the Data header synchronisation.
  86          * Attempt to detect the situation of the previous socket buffer having
  87          * been truncated or a socket buffer was missing. These situations
  88          * cause a discontinuity in the data stream and therefore need to avoid
  89          * appending bad data to the end of the current netdev socket buffer.
  90          * Also avoid unnecessarily discarding a good current netdev socket
  91          * buffer.
  92          */
  93         if (rx->remaining && (rx->remaining + sizeof(u32) <= skb->len)) {
  94                 offset = ((rx->remaining + 1) & 0xfffe);
  95                 rx->header = get_unaligned_le32(skb->data + offset);
  96                 offset = 0;
  97
  98                 size = (u16)(rx->header & 0x7ff);
  99                 if (size != ((~rx->header >> 16) & 0x7ff)) {
 100                         netdev_err(dev->net, "asix_rx_fixup() Data Header synchronisation was lost, remaining %d\n",
 101                                    rx->remaining);
 102                         if (rx->ax_skb) {
 103                                 kfree_skb(rx->ax_skb);
 104                                 rx->ax_skb = NULL;
 105                                 /* Discard the incomplete netdev Ethernet frame
 106                                  * and assume the Data header is at the start of
 107                                  * the current URB socket buffer.
 108                                  */
 109                         }
 110                         rx->remaining = 0;
 111                 }
 112         }
 113
 114         while (offset + sizeof(u16) <= skb->len) {
 115                 u16 copy_length;
 116
 117                 if (!rx->remaining) {
 118                         if (skb->len - offset == sizeof(u16)) {
 119                                 rx->header = get_unaligned_le16(
 120                                                 skb->data + offset);
 121                                 rx->split_head = true;
 122                                 offset += sizeof(u16);
 123                                 break;
 124                         }
 125
 126                         if (rx->split_head == true) {
 127                                 rx->header |= (get_unaligned_le16(
 128                                                 skb->data + offset) << 16);
 129                                 rx->split_head = false;
 130                                 offset += sizeof(u16);
 131                         } else {
 132                                 rx->header = get_unaligned_le32(skb->data +
 133                                                                 offset);
 134                                 offset += sizeof(u32);
 135                         }
 136
 137                         /* take frame length from Data header 32-bit word */
 138                         size = (u16)(rx->header & 0x7ff);
 139                         if (size != ((~rx->header >> 16) & 0x7ff)) {
 140                                 netdev_err(dev->net, "asix_rx_fixup() Bad Header Length 0x%x, offset %d\n",
 141                                            rx->header, offset);
 142                                 return 0;
 143                         }
 144                         if (size > dev->net->mtu + ETH_HLEN + VLAN_HLEN) {
 145                                 netdev_dbg(dev->net, "asix_rx_fixup() Bad RX Length %d\n",
 146                                            size);
 147                                 return 0;
 148                         }
 149
 150                         /* Sometimes may fail to get a netdev socket buffer but
 151                          * continue to process the URB socket buffer so that
 152                          * synchronisation of the Ethernet frame Data header
 153                          * word is maintained.
 154                          */
 155                         rx->ax_skb = netdev_alloc_skb_ip_align(dev->net, size);
 156
 157                         rx->remaining = size;
 158                 }
 159
 160                 if (rx->remaining > skb->len - offset) {
 161                         copy_length = skb->len - offset;
 162                         rx->remaining -= copy_length;
 163                 } else {
 164                         copy_length = rx->remaining;
 165                         rx->remaining = 0;
 166                 }
 167
 168                 if (rx->ax_skb) {
 169                         skb_put_data(rx->ax_skb, skb->data + offset,
 170                                      copy_length);
 171                         if (!rx->remaining)
 172                                 usbnet_skb_return(dev, rx->ax_skb);
 173                 }
 174
 175                 offset += (copy_length + 1) & 0xfffe;
 176         }
 177
 178         if (skb->len != offset) {
 179                 netdev_err(dev->net, "asix_rx_fixup() Bad SKB Length %d, %d\n",
 180                            skb->len, offset);
 181                 return 0;
 182         }
 183
 184         return 1;
 185 }
 186
 187 int asix_rx_fixup_common(struct usbnet *dev, struct sk_buff *skb)
 188 {
 189         struct asix_common_private *dp = dev->driver_priv;
 190         struct asix_rx_fixup_info *rx = &dp->rx_fixup_info;
 191
 192         return asix_rx_fixup_internal(dev, skb, rx);
 193 }
 194
 195 struct sk_buff *asix_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
 196                               gfp_t flags)
 197 {
 198         int padlen;
 199         int headroom = skb_headroom(skb);
 200         int tailroom = skb_tailroom(skb);
 201         u32 packet_len;
 202         u32 padbytes = 0xffff0000;
 203
 204         padlen = ((skb->len + 4) & (dev->maxpacket - 1)) ? 0 : 4;
 205
 206         /* We need to push 4 bytes in front of frame (packet_len)
 207          * and maybe add 4 bytes after the end (if padlen is 4)
 208          *
 209          * Avoid skb_copy_expand() expensive call, using following rules :
 210          * - We are allowed to push 4 bytes in headroom if skb_header_cloned()
 211          *   is false (and if we have 4 bytes of headroom)
 212          * - We are allowed to put 4 bytes at tail if skb_cloned()
 213          *   is false (and if we have 4 bytes of tailroom)
 214          *
 215          * TCP packets for example are cloned, but skb_header_release()
 216          * was called in tcp stack, allowing us to use headroom for our needs.
 217          */
 218         if (!skb_header_cloned(skb) &&
 219             !(padlen && skb_cloned(skb)) &&
 220             headroom + tailroom >= 4 + padlen) {
 221                 /* following should not happen, but better be safe */
 222                 if (headroom < 4 ||
 223                     tailroom < padlen) {
 224                         skb->data = memmove(skb->head + 4, skb->data, skb->len);
 225                         skb_set_tail_pointer(skb, skb->len);
 226                 }
 227         } else {
 228                 struct sk_buff *skb2;
 229
 230                 skb2 = skb_copy_expand(skb, 4, padlen, flags);
 231                 dev_kfree_skb_any(skb);
 232                 skb = skb2;
 233                 if (!skb)
 234                         return NULL;
 235         }
 236
 237         packet_len = ((skb->len ^ 0x0000ffff) << 16) + skb->len;
 238         skb_push(skb, 4);
 239         cpu_to_le32s(&packet_len);
 240         skb_copy_to_linear_data(skb, &packet_len, sizeof(packet_len));
 241
 242         if (padlen) {
 243                 cpu_to_le32s(&padbytes);
 244                 memcpy(skb_tail_pointer(skb), &padbytes, sizeof(padbytes));
 245                 skb_put(skb, sizeof(padbytes));
 246         }
 247
 248         usbnet_set_skb_tx_stats(skb, 1, 0);
 249         return skb;
 250 }
 251
 252 int asix_set_sw_mii(struct usbnet *dev, int in_pm)
 253 {
 254         int ret;
 255         ret = asix_write_cmd(dev, AX_CMD_SET_SW_MII, 0x0000, 0, 0, NULL, in_pm);
 256
 257         if (ret < 0)
 258                 netdev_err(dev->net, "Failed to enable software MII access\n");
 259         return ret;
 260 }
 261
 262 int asix_set_hw_mii(struct usbnet *dev, int in_pm)
 263 {
 264         int ret;
 265         ret = asix_write_cmd(dev, AX_CMD_SET_HW_MII, 0x0000, 0, 0, NULL, in_pm);
 266         if (ret < 0)
 267                 netdev_err(dev->net, "Failed to enable hardware MII access\n");
 268         return ret;
 269 }
 270
 271 int asix_read_phy_addr(struct usbnet *dev, int internal)
 272 {
 273         int offset = (internal ? 1 : 0);
 274         u8 buf[2];
 275         int ret = asix_read_cmd(dev, AX_CMD_READ_PHY_ID, 0, 0, 2, buf, 0);
 276
 277         netdev_dbg(dev->net, "asix_get_phy_addr()\n");
 278
 279         if (ret < 0) {
 280                 netdev_err(dev->net, "Error reading PHYID register: %02x\n", ret);
 281                 goto out;
 282         }
 283         netdev_dbg(dev->net, "asix_get_phy_addr() returning 0x%04x\n",
 284                    *((__le16 *)buf));
 285         ret = buf[offset];
 286
 287 out:
 288         return ret;
 289 }
 290
 291 int asix_get_phy_addr(struct usbnet *dev)
 292 {
 293         /* return the address of the internal phy */
 294         return asix_read_phy_addr(dev, 1);
 295 }
 296
 297
 298 int asix_sw_reset(struct usbnet *dev, u8 flags, int in_pm)
 299 {
 300         int ret;
 301
 302         ret = asix_write_cmd(dev, AX_CMD_SW_RESET, flags, 0, 0, NULL, in_pm);
 303         if (ret < 0)
 304                 netdev_err(dev->net, "Failed to send software reset: %02x\n", ret);
 305
 306         return ret;
 307 }
 308
 309 u16 asix_read_rx_ctl(struct usbnet *dev, int in_pm)
 310 {
 311         __le16 v;
 312         int ret = asix_read_cmd(dev, AX_CMD_READ_RX_CTL, 0, 0, 2, &v, in_pm);
 313
 314         if (ret < 0) {
 315                 netdev_err(dev->net, "Error reading RX_CTL register: %02x\n", ret);
 316                 goto out;
 317         }
 318         ret = le16_to_cpu(v);
 319 out:
 320         return ret;
 321 }
 322
 323 int asix_write_rx_ctl(struct usbnet *dev, u16 mode, int in_pm)
 324 {
 325         int ret;
 326
 327         netdev_dbg(dev->net, "asix_write_rx_ctl() - mode = 0x%04x\n", mode);
 328         ret = asix_write_cmd(dev, AX_CMD_WRITE_RX_CTL, mode, 0, 0, NULL, in_pm);
 329         if (ret < 0)
 330                 netdev_err(dev->net, "Failed to write RX_CTL mode to 0x%04x: %02x\n",
 331                            mode, ret);
 332
 333         return ret;
 334 }
 335
 336 u16 asix_read_medium_status(struct usbnet *dev, int in_pm)
 337 {
 338         __le16 v;
 339         int ret = asix_read_cmd(dev, AX_CMD_READ_MEDIUM_STATUS,
 340                                 0, 0, 2, &v, in_pm);
 341
 342         if (ret < 0) {
 343                 netdev_err(dev->net, "Error reading Medium Status register: %02x\n",
 344                            ret);
 345                 return ret;     /* TODO: callers not checking for error ret */
 346         }
 347
 348         return le16_to_cpu(v);
 349
 350 }
 351
 352 int asix_write_medium_mode(struct usbnet *dev, u16 mode, int in_pm)
 353 {
 354         int ret;
 355
 356         netdev_dbg(dev->net, "asix_write_medium_mode() - mode = 0x%04x\n", mode);
 357         ret = asix_write_cmd(dev, AX_CMD_WRITE_MEDIUM_MODE,
 358                              mode, 0, 0, NULL, in_pm);
 359         if (ret < 0)
 360                 netdev_err(dev->net, "Failed to write Medium Mode mode to 0x%04x: %02x\n",
 361                            mode, ret);
 362
 363         return ret;
 364 }
 365
 366 int asix_write_gpio(struct usbnet *dev, u16 value, int sleep, int in_pm)
 367 {
 368         int ret;
 369
 370         netdev_dbg(dev->net, "asix_write_gpio() - value = 0x%04x\n", value);
 371         ret = asix_write_cmd(dev, AX_CMD_WRITE_GPIOS, value, 0, 0, NULL, in_pm);
 372         if (ret < 0)
 373                 netdev_err(dev->net, "Failed to write GPIO value 0x%04x: %02x\n",
 374                            value, ret);
 375
 376         if (sleep)
 377                 msleep(sleep);
 378
 379         return ret;
 380 }
 381
 382 /*
 383  * AX88772 & AX88178 have a 16-bit RX_CTL value
 384  */
 385 void asix_set_multicast(struct net_device *net)
 386 {
 387         struct usbnet *dev = netdev_priv(net);
 388         struct asix_data *data = (struct asix_data *)&dev->data;
 389         u16 rx_ctl = AX_DEFAULT_RX_CTL;
 390
 391         if (net->flags & IFF_PROMISC) {
 392                 rx_ctl |= AX_RX_CTL_PRO;
 393         } else if (net->flags & IFF_ALLMULTI ||
 394                    netdev_mc_count(net) > AX_MAX_MCAST) {
 395                 rx_ctl |= AX_RX_CTL_AMALL;
 396         } else if (netdev_mc_empty(net)) {
 397                 /* just broadcast and directed */
 398         } else {
 399                 /* We use the 20 byte dev->data
 400                  * for our 8 byte filter buffer
 401                  * to avoid allocating memory that
 402                  * is tricky to free later */
 403                 struct netdev_hw_addr *ha;
 404                 u32 crc_bits;
 405
 406                 memset(data->multi_filter, 0, AX_MCAST_FILTER_SIZE);
 407
 408                 /* Build the multicast hash filter. */
 409                 netdev_for_each_mc_addr(ha, net) {
 410                         crc_bits = ether_crc(ETH_ALEN, ha->addr) >> 26;
 411                         data->multi_filter[crc_bits >> 3] |=
 412                             1 << (crc_bits & 7);
 413                 }
 414
 415                 asix_write_cmd_async(dev, AX_CMD_WRITE_MULTI_FILTER, 0, 0,
 416                                    AX_MCAST_FILTER_SIZE, data->multi_filter);
 417
 418                 rx_ctl |= AX_RX_CTL_AM;
 419         }
 420
 421         asix_write_cmd_async(dev, AX_CMD_WRITE_RX_CTL, rx_ctl, 0, 0, NULL);
 422 }
 423
 424 int asix_mdio_read(struct net_device *netdev, int phy_id, int loc)
 425 {
 426         struct usbnet *dev = netdev_priv(netdev);
 427         __le16 res;
 428         u8 smsr;
 429         int i = 0;
 430         int ret;
 431
 432         mutex_lock(&dev->phy_mutex);
 433         do {
 434                 ret = asix_set_sw_mii(dev, 0);
 435                 if (ret == -ENODEV || ret == -ETIMEDOUT)
 436                         break;
 437                 usleep_range(1000, 1100);
 438                 ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG,
 439                                     0, 0, 1, &smsr, 0);
 440         } while (!(smsr & AX_HOST_EN) && (i++ < 30) && (ret != -ENODEV));
 441         if (ret == -ENODEV || ret == -ETIMEDOUT) {
 442                 mutex_unlock(&dev->phy_mutex);
 443                 return ret;
 444         }
 445
 446         asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
 447                                 (__u16)loc, 2, &res, 0);
 448         asix_set_hw_mii(dev, 0);
 449         mutex_unlock(&dev->phy_mutex);
 450
 451         netdev_dbg(dev->net, "asix_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n",
 452                         phy_id, loc, le16_to_cpu(res));
 453
 454         return le16_to_cpu(res);
 455 }
 456
 457 void asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val)
 458 {
 459         struct usbnet *dev = netdev_priv(netdev);
 460         __le16 res = cpu_to_le16(val);
 461         u8 smsr;
 462         int i = 0;
 463         int ret;
 464
 465         netdev_dbg(dev->net, "asix_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
 466                         phy_id, loc, val);
 467
 468         mutex_lock(&dev->phy_mutex);
 469         do {
 470                 ret = asix_set_sw_mii(dev, 0);
 471                 if (ret == -ENODEV)
 472                         break;
 473                 usleep_range(1000, 1100);
 474                 ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG,
 475                                     0, 0, 1, &smsr, 0);
 476         } while (!(smsr & AX_HOST_EN) && (i++ < 30) && (ret != -ENODEV));
 477         if (ret == -ENODEV) {
 478                 mutex_unlock(&dev->phy_mutex);
 479                 return;
 480         }
 481
 482         asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id,
 483                        (__u16)loc, 2, &res, 0);
 484         asix_set_hw_mii(dev, 0);
 485         mutex_unlock(&dev->phy_mutex);
 486 }
 487
 488 int asix_mdio_read_nopm(struct net_device *netdev, int phy_id, int loc)
 489 {
 490         struct usbnet *dev = netdev_priv(netdev);
 491         __le16 res;
 492         u8 smsr;
 493         int i = 0;
 494         int ret;
 495
 496         mutex_lock(&dev->phy_mutex);
 497         do {
 498                 ret = asix_set_sw_mii(dev, 1);
 499                 if (ret == -ENODEV || ret == -ETIMEDOUT)
 500                         break;
 501                 usleep_range(1000, 1100);
 502                 ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG,
 503                                     0, 0, 1, &smsr, 1);
 504         } while (!(smsr & AX_HOST_EN) && (i++ < 30) && (ret != -ENODEV));
 505         if (ret == -ENODEV || ret == -ETIMEDOUT) {
 506                 mutex_unlock(&dev->phy_mutex);
 507                 return ret;
 508         }
 509
 510         asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
 511                       (__u16)loc, 2, &res, 1);
 512         asix_set_hw_mii(dev, 1);
 513         mutex_unlock(&dev->phy_mutex);
 514
 515         netdev_dbg(dev->net, "asix_mdio_read_nopm() phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n",
 516                         phy_id, loc, le16_to_cpu(res));
 517
 518         return le16_to_cpu(res);
 519 }
 520
 521 void
 522 asix_mdio_write_nopm(struct net_device *netdev, int phy_id, int loc, int val)
 523 {
 524         struct usbnet *dev = netdev_priv(netdev);
 525         __le16 res = cpu_to_le16(val);
 526         u8 smsr;
 527         int i = 0;
 528         int ret;
 529
 530         netdev_dbg(dev->net, "asix_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
 531                         phy_id, loc, val);
 532
 533         mutex_lock(&dev->phy_mutex);
 534         do {
 535                 ret = asix_set_sw_mii(dev, 1);
 536                 if (ret == -ENODEV)
 537                         break;
 538                 usleep_range(1000, 1100);
 539                 ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG,
 540                                     0, 0, 1, &smsr, 1);
 541         } while (!(smsr & AX_HOST_EN) && (i++ < 30) && (ret != -ENODEV));
 542         if (ret == -ENODEV) {
 543                 mutex_unlock(&dev->phy_mutex);
 544                 return;
 545         }
 546
 547         asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id,
 548                        (__u16)loc, 2, &res, 1);
 549         asix_set_hw_mii(dev, 1);
 550         mutex_unlock(&dev->phy_mutex);
 551 }
 552
 553 void asix_get_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
 554 {
 555         struct usbnet *dev = netdev_priv(net);
 556         u8 opt;
 557
 558         if (asix_read_cmd(dev, AX_CMD_READ_MONITOR_MODE,
 559                           0, 0, 1, &opt, 0) < 0) {
 560                 wolinfo->supported = 0;
 561                 wolinfo->wolopts = 0;
 562                 return;
 563         }
 564         wolinfo->supported = WAKE_PHY | WAKE_MAGIC;
 565         wolinfo->wolopts = 0;
 566         if (opt & AX_MONITOR_LINK)
 567                 wolinfo->wolopts |= WAKE_PHY;
 568         if (opt & AX_MONITOR_MAGIC)
 569                 wolinfo->wolopts |= WAKE_MAGIC;
 570 }
 571
 572 int asix_set_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
 573 {
 574         struct usbnet *dev = netdev_priv(net);
 575         u8 opt = 0;
 576
 577         if (wolinfo->wolopts & WAKE_PHY)
 578                 opt |= AX_MONITOR_LINK;
 579         if (wolinfo->wolopts & WAKE_MAGIC)
 580                 opt |= AX_MONITOR_MAGIC;
 581
 582         if (asix_write_cmd(dev, AX_CMD_WRITE_MONITOR_MODE,
 583                               opt, 0, 0, NULL, 0) < 0)
 584                 return -EINVAL;
 585
 586         return 0;
 587 }
 588
 589 int asix_get_eeprom_len(struct net_device *net)
 590 {
 591         return AX_EEPROM_LEN;
 592 }
 593
 594 int asix_get_eeprom(struct net_device *net, struct ethtool_eeprom *eeprom,
 595                     u8 *data)
 596 {
 597         struct usbnet *dev = netdev_priv(net);
 598         u16 *eeprom_buff;
 599         int first_word, last_word;
 600         int i;
 601
 602         if (eeprom->len == 0)
 603                 return -EINVAL;
 604
 605         eeprom->magic = AX_EEPROM_MAGIC;
 606
 607         first_word = eeprom->offset >> 1;
 608         last_word = (eeprom->offset + eeprom->len - 1) >> 1;
 609
 610         eeprom_buff = kmalloc(sizeof(u16) * (last_word - first_word + 1),
 611                               GFP_KERNEL);
 612         if (!eeprom_buff)
 613                 return -ENOMEM;
 614
 615         /* ax8817x returns 2 bytes from eeprom on read */
 616         for (i = first_word; i <= last_word; i++) {
 617                 if (asix_read_cmd(dev, AX_CMD_READ_EEPROM, i, 0, 2,
 618                                   &eeprom_buff[i - first_word], 0) < 0) {
 619                         kfree(eeprom_buff);
 620                         return -EIO;
 621                 }
 622         }
 623
 624         memcpy(data, (u8 *)eeprom_buff + (eeprom->offset & 1), eeprom->len);
 625         kfree(eeprom_buff);
 626         return 0;
 627 }
 628
 629 int asix_set_eeprom(struct net_device *net, struct ethtool_eeprom *eeprom,
 630                     u8 *data)
 631 {
 632         struct usbnet *dev = netdev_priv(net);
 633         u16 *eeprom_buff;
 634         int first_word, last_word;
 635         int i;
 636         int ret;
 637
 638         netdev_dbg(net, "write EEPROM len %d, offset %d, magic 0x%x\n",
 639                    eeprom->len, eeprom->offset, eeprom->magic);
 640
 641         if (eeprom->len == 0)
 642                 return -EINVAL;
 643
 644         if (eeprom->magic != AX_EEPROM_MAGIC)
 645                 return -EINVAL;
 646
 647         first_word = eeprom->offset >> 1;
 648         last_word = (eeprom->offset + eeprom->len - 1) >> 1;
 649
 650         eeprom_buff = kmalloc(sizeof(u16) * (last_word - first_word + 1),
 651                               GFP_KERNEL);
 652         if (!eeprom_buff)
 653                 return -ENOMEM;
 654
 655         /* align data to 16 bit boundaries, read the missing data from
 656            the EEPROM */
 657         if (eeprom->offset & 1) {
 658                 ret = asix_read_cmd(dev, AX_CMD_READ_EEPROM, first_word, 0, 2,
 659                                     &eeprom_buff[0], 0);
 660                 if (ret < 0) {
 661                         netdev_err(net, "Failed to read EEPROM at offset 0x%02x.\n", first_word);
 662                         goto free;
 663                 }
 664         }
 665
 666         if ((eeprom->offset + eeprom->len) & 1) {
 667                 ret = asix_read_cmd(dev, AX_CMD_READ_EEPROM, last_word, 0, 2,
 668                                     &eeprom_buff[last_word - first_word], 0);
 669                 if (ret < 0) {
 670                         netdev_err(net, "Failed to read EEPROM at offset 0x%02x.\n", last_word);
 671                         goto free;
 672                 }
 673         }
 674
 675         memcpy((u8 *)eeprom_buff + (eeprom->offset & 1), data, eeprom->len);
 676
 677         /* write data to EEPROM */
 678         ret = asix_write_cmd(dev, AX_CMD_WRITE_ENABLE, 0x0000, 0, 0, NULL, 0);
 679         if (ret < 0) {
 680                 netdev_err(net, "Failed to enable EEPROM write\n");
 681                 goto free;
 682         }
 683         msleep(20);
 684
 685         for (i = first_word; i <= last_word; i++) {
 686                 netdev_dbg(net, "write to EEPROM at offset 0x%02x, data 0x%04x\n",
 687                            i, eeprom_buff[i - first_word]);
 688                 ret = asix_write_cmd(dev, AX_CMD_WRITE_EEPROM, i,
 689                                      eeprom_buff[i - first_word], 0, NULL, 0);
 690                 if (ret < 0) {
 691                         netdev_err(net, "Failed to write EEPROM at offset 0x%02x.\n",
 692                                    i);
 693                         goto free;
 694                 }
 695                 msleep(20);
 696         }
 697
 698         ret = asix_write_cmd(dev, AX_CMD_WRITE_DISABLE, 0x0000, 0, 0, NULL, 0);
 699         if (ret < 0) {
 700                 netdev_err(net, "Failed to disable EEPROM write\n");
 701                 goto free;
 702         }
 703
 704         ret = 0;
 705 free:
 706         kfree(eeprom_buff);
 707         return ret;
 708 }
 709
 710 void asix_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
 711 {
 712         /* Inherit standard device info */
 713         usbnet_get_drvinfo(net, info);
 714         strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
 715         strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
 716 }
 717
 718 int asix_set_mac_address(struct net_device *net, void *p)
 719 {
 720         struct usbnet *dev = netdev_priv(net);
 721         struct asix_data *data = (struct asix_data *)&dev->data;
 722         struct sockaddr *addr = p;
 723
 724         if (netif_running(net))
 725                 return -EBUSY;
 726         if (!is_valid_ether_addr(addr->sa_data))
 727                 return -EADDRNOTAVAIL;
 728
 729         memcpy(net->dev_addr, addr->sa_data, ETH_ALEN);
 730
 731         /* We use the 20 byte dev->data
 732          * for our 6 byte mac buffer
 733          * to avoid allocating memory that
 734          * is tricky to free later */
 735         memcpy(data->mac_addr, addr->sa_data, ETH_ALEN);
 736         asix_write_cmd_async(dev, AX_CMD_WRITE_NODE_ID, 0, 0, ETH_ALEN,
 737                                                         data->mac_addr);
 738
 739         return 0;
 740 }