drivers/net/usb/asix_common.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * ASIX AX8817X based USB 2.0 Ethernet Devices
   4  * Copyright (C) 2003-2006 David Hollis <dhollis@davehollis.com>
   5  * Copyright (C) 2005 Phil Chang <pchang23@sbcglobal.net>
   6  * Copyright (C) 2006 James Painter <jamie.painter@iname.com>
   7  * Copyright (c) 2002-2003 TiVo Inc.
   8  */
   9
  10 #include "asix.h"
  11
  12 #define AX_HOST_EN_RETRIES      30
  13
  14 int __must_check asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
  15                                u16 size, void *data, int in_pm)
  16 {
  17         int ret;
  18         int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
  19
  20         BUG_ON(!dev);
  21
  22         if (!in_pm)
  23                 fn = usbnet_read_cmd;
  24         else
  25                 fn = usbnet_read_cmd_nopm;
  26
  27         ret = fn(dev, cmd, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  28                  value, index, data, size);
  29
  30         if (unlikely(ret < size)) {
  31                 ret = ret < 0 ? ret : -ENODATA;
  32
  33                 netdev_warn(dev->net, "Failed to read reg index 0x%04x: %d\n",
  34                             index, ret);
  35         }
  36
  37         return ret;
  38 }
  39
  40 int asix_write_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
  41                    u16 size, void *data, int in_pm)
  42 {
  43         int ret;
  44         int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
  45
  46         BUG_ON(!dev);
  47
  48         if (!in_pm)
  49                 fn = usbnet_write_cmd;
  50         else
  51                 fn = usbnet_write_cmd_nopm;
  52
  53         ret = fn(dev, cmd, USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  54                  value, index, data, size);
  55
  56         if (unlikely(ret < 0))
  57                 netdev_warn(dev->net, "Failed to write reg index 0x%04x: %d\n",
  58                             index, ret);
  59
  60         return ret;
  61 }
  62
  63 void asix_write_cmd_async(struct usbnet *dev, u8 cmd, u16 value, u16 index,
  64                           u16 size, void *data)
  65 {
  66         usbnet_write_cmd_async(dev, cmd,
  67                                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  68                                value, index, data, size);
  69 }
  70
  71 static int asix_set_sw_mii(struct usbnet *dev, int in_pm)
  72 {
  73         int ret;
  74
  75         ret = asix_write_cmd(dev, AX_CMD_SET_SW_MII, 0x0000, 0, 0, NULL, in_pm);
  76
  77         if (ret < 0)
  78                 netdev_err(dev->net, "Failed to enable software MII access\n");
  79         return ret;
  80 }
  81
  82 static int asix_set_hw_mii(struct usbnet *dev, int in_pm)
  83 {
  84         int ret;
  85
  86         ret = asix_write_cmd(dev, AX_CMD_SET_HW_MII, 0x0000, 0, 0, NULL, in_pm);
  87         if (ret < 0)
  88                 netdev_err(dev->net, "Failed to enable hardware MII access\n");
  89         return ret;
  90 }
  91
  92 static int asix_check_host_enable(struct usbnet *dev, int in_pm)
  93 {
  94         int i, ret;
  95         u8 smsr;
  96
  97         for (i = 0; i < AX_HOST_EN_RETRIES; ++i) {
  98                 ret = asix_set_sw_mii(dev, in_pm);
  99                 if (ret == -ENODEV || ret == -ETIMEDOUT)
 100                         break;
 101                 usleep_range(1000, 1100);
 102                 ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG,
 103                                     0, 0, 1, &smsr, in_pm);
 104                 if (ret == -ENODEV)
 105                         break;
 106                 else if (ret < 0)
 107                         continue;
 108                 else if (smsr & AX_HOST_EN)
 109                         break;
 110         }
 111
 112         return i >= AX_HOST_EN_RETRIES ? -ETIMEDOUT : ret;
 113 }
 114
 115 static void reset_asix_rx_fixup_info(struct asix_rx_fixup_info *rx)
 116 {
 117         /* Reset the variables that have a lifetime outside of
 118          * asix_rx_fixup_internal() so that future processing starts from a
 119          * known set of initial conditions.
 120          */
 121
 122         if (rx->ax_skb) {
 123                 /* Discard any incomplete Ethernet frame in the netdev buffer */
 124                 kfree_skb(rx->ax_skb);
 125                 rx->ax_skb = NULL;
 126         }
 127
 128         /* Assume the Data header 32-bit word is at the start of the current
 129          * or next URB socket buffer so reset all the state variables.
 130          */
 131         rx->remaining = 0;
 132         rx->split_head = false;
 133         rx->header = 0;
 134 }
 135
 136 int asix_rx_fixup_internal(struct usbnet *dev, struct sk_buff *skb,
 137                            struct asix_rx_fixup_info *rx)
 138 {
 139         int offset = 0;
 140         u16 size;
 141
 142         /* When an Ethernet frame spans multiple URB socket buffers,
 143          * do a sanity test for the Data header synchronisation.
 144          * Attempt to detect the situation of the previous socket buffer having
 145          * been truncated or a socket buffer was missing. These situations
 146          * cause a discontinuity in the data stream and therefore need to avoid
 147          * appending bad data to the end of the current netdev socket buffer.
 148          * Also avoid unnecessarily discarding a good current netdev socket
 149          * buffer.
 150          */
 151         if (rx->remaining && (rx->remaining + sizeof(u32) <= skb->len)) {
 152                 offset = ((rx->remaining + 1) & 0xfffe);
 153                 rx->header = get_unaligned_le32(skb->data + offset);
 154                 offset = 0;
 155
 156                 size = (u16)(rx->header & 0x7ff);
 157                 if (size != ((~rx->header >> 16) & 0x7ff)) {
 158                         netdev_err(dev->net, "asix_rx_fixup() Data Header synchronisation was lost, remaining %d\n",
 159                                    rx->remaining);
 160                         reset_asix_rx_fixup_info(rx);
 161                 }
 162         }
 163
 164         while (offset + sizeof(u16) <= skb->len) {
 165                 u16 copy_length;
 166
 167                 if (!rx->remaining) {
 168                         if (skb->len - offset == sizeof(u16)) {
 169                                 rx->header = get_unaligned_le16(
 170                                                 skb->data + offset);
 171                                 rx->split_head = true;
 172                                 offset += sizeof(u16);
 173                                 break;
 174                         }
 175
 176                         if (rx->split_head == true) {
 177                                 rx->header |= (get_unaligned_le16(
 178                                                 skb->data + offset) << 16);
 179                                 rx->split_head = false;
 180                                 offset += sizeof(u16);
 181                         } else {
 182                                 rx->header = get_unaligned_le32(skb->data +
 183                                                                 offset);
 184                                 offset += sizeof(u32);
 185                         }
 186
 187                         /* take frame length from Data header 32-bit word */
 188                         size = (u16)(rx->header & 0x7ff);
 189                         if (size != ((~rx->header >> 16) & 0x7ff)) {
 190                                 netdev_err(dev->net, "asix_rx_fixup() Bad Header Length 0x%x, offset %d\n",
 191                                            rx->header, offset);
 192                                 reset_asix_rx_fixup_info(rx);
 193                                 return 0;
 194                         }
 195                         if (size > dev->net->mtu + ETH_HLEN + VLAN_HLEN) {
 196                                 netdev_dbg(dev->net, "asix_rx_fixup() Bad RX Length %d\n",
 197                                            size);
 198                                 reset_asix_rx_fixup_info(rx);
 199                                 return 0;
 200                         }
 201
 202                         /* Sometimes may fail to get a netdev socket buffer but
 203                          * continue to process the URB socket buffer so that
 204                          * synchronisation of the Ethernet frame Data header
 205                          * word is maintained.
 206                          */
 207                         rx->ax_skb = netdev_alloc_skb_ip_align(dev->net, size);
 208
 209                         rx->remaining = size;
 210                 }
 211
 212                 if (rx->remaining > skb->len - offset) {
 213                         copy_length = skb->len - offset;
 214                         rx->remaining -= copy_length;
 215                 } else {
 216                         copy_length = rx->remaining;
 217                         rx->remaining = 0;
 218                 }
 219
 220                 if (rx->ax_skb) {
 221                         skb_put_data(rx->ax_skb, skb->data + offset,
 222                                      copy_length);
 223                         if (!rx->remaining) {
 224                                 usbnet_skb_return(dev, rx->ax_skb);
 225                                 rx->ax_skb = NULL;
 226                         }
 227                 }
 228
 229                 offset += (copy_length + 1) & 0xfffe;
 230         }
 231
 232         if (skb->len != offset) {
 233                 netdev_err(dev->net, "asix_rx_fixup() Bad SKB Length %d, %d\n",
 234                            skb->len, offset);
 235                 reset_asix_rx_fixup_info(rx);
 236                 return 0;
 237         }
 238
 239         return 1;
 240 }
 241
 242 int asix_rx_fixup_common(struct usbnet *dev, struct sk_buff *skb)
 243 {
 244         struct asix_common_private *dp = dev->driver_priv;
 245         struct asix_rx_fixup_info *rx = &dp->rx_fixup_info;
 246
 247         return asix_rx_fixup_internal(dev, skb, rx);
 248 }
 249
 250 void asix_rx_fixup_common_free(struct asix_common_private *dp)
 251 {
 252         struct asix_rx_fixup_info *rx;
 253
 254         if (!dp)
 255                 return;
 256
 257         rx = &dp->rx_fixup_info;
 258
 259         if (rx->ax_skb) {
 260                 kfree_skb(rx->ax_skb);
 261                 rx->ax_skb = NULL;
 262         }
 263 }
 264
 265 struct sk_buff *asix_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
 266                               gfp_t flags)
 267 {
 268         int padlen;
 269         int headroom = skb_headroom(skb);
 270         int tailroom = skb_tailroom(skb);
 271         u32 packet_len;
 272         u32 padbytes = 0xffff0000;
 273         void *ptr;
 274
 275         padlen = ((skb->len + 4) & (dev->maxpacket - 1)) ? 0 : 4;
 276
 277         /* We need to push 4 bytes in front of frame (packet_len)
 278          * and maybe add 4 bytes after the end (if padlen is 4)
 279          *
 280          * Avoid skb_copy_expand() expensive call, using following rules :
 281          * - We are allowed to push 4 bytes in headroom if skb_header_cloned()
 282          *   is false (and if we have 4 bytes of headroom)
 283          * - We are allowed to put 4 bytes at tail if skb_cloned()
 284          *   is false (and if we have 4 bytes of tailroom)
 285          *
 286          * TCP packets for example are cloned, but __skb_header_release()
 287          * was called in tcp stack, allowing us to use headroom for our needs.
 288          */
 289         if (!skb_header_cloned(skb) &&
 290             !(padlen && skb_cloned(skb)) &&
 291             headroom + tailroom >= 4 + padlen) {
 292                 /* following should not happen, but better be safe */
 293                 if (headroom < 4 ||
 294                     tailroom < padlen) {
 295                         skb->data = memmove(skb->head + 4, skb->data, skb->len);
 296                         skb_set_tail_pointer(skb, skb->len);
 297                 }
 298         } else {
 299                 struct sk_buff *skb2;
 300
 301                 skb2 = skb_copy_expand(skb, 4, padlen, flags);
 302                 dev_kfree_skb_any(skb);
 303                 skb = skb2;
 304                 if (!skb)
 305                         return NULL;
 306         }
 307
 308         packet_len = ((skb->len ^ 0x0000ffff) << 16) + skb->len;
 309         ptr = skb_push(skb, 4);
 310         put_unaligned_le32(packet_len, ptr);
 311
 312         if (padlen) {
 313                 put_unaligned_le32(padbytes, skb_tail_pointer(skb));
 314                 skb_put(skb, sizeof(padbytes));
 315         }
 316
 317         usbnet_set_skb_tx_stats(skb, 1, 0);
 318         return skb;
 319 }
 320
 321 int asix_read_phy_addr(struct usbnet *dev, bool internal)
 322 {
 323         int ret, offset;
 324         u8 buf[2];
 325
 326         ret = asix_read_cmd(dev, AX_CMD_READ_PHY_ID, 0, 0, 2, buf, 0);
 327         if (ret < 0)
 328                 goto error;
 329
 330         if (ret < 2) {
 331                 ret = -EIO;
 332                 goto error;
 333         }
 334
 335         offset = (internal ? 1 : 0);
 336         ret = buf[offset];
 337
 338         netdev_dbg(dev->net, "%s PHY address 0x%x\n",
 339                    internal ? "internal" : "external", ret);
 340
 341         return ret;
 342
 343 error:
 344         netdev_err(dev->net, "Error reading PHY_ID register: %02x\n", ret);
 345
 346         return ret;
 347 }
 348
 349 int asix_sw_reset(struct usbnet *dev, u8 flags, int in_pm)
 350 {
 351         int ret;
 352
 353         ret = asix_write_cmd(dev, AX_CMD_SW_RESET, flags, 0, 0, NULL, in_pm);
 354         if (ret < 0)
 355                 netdev_err(dev->net, "Failed to send software reset: %02x\n", ret);
 356
 357         return ret;
 358 }
 359
 360 u16 asix_read_rx_ctl(struct usbnet *dev, int in_pm)
 361 {
 362         __le16 v;
 363         int ret = asix_read_cmd(dev, AX_CMD_READ_RX_CTL, 0, 0, 2, &v, in_pm);
 364
 365         if (ret < 0) {
 366                 netdev_err(dev->net, "Error reading RX_CTL register: %02x\n", ret);
 367                 goto out;
 368         }
 369         ret = le16_to_cpu(v);
 370 out:
 371         return ret;
 372 }
 373
 374 int asix_write_rx_ctl(struct usbnet *dev, u16 mode, int in_pm)
 375 {
 376         int ret;
 377
 378         netdev_dbg(dev->net, "asix_write_rx_ctl() - mode = 0x%04x\n", mode);
 379         ret = asix_write_cmd(dev, AX_CMD_WRITE_RX_CTL, mode, 0, 0, NULL, in_pm);
 380         if (ret < 0)
 381                 netdev_err(dev->net, "Failed to write RX_CTL mode to 0x%04x: %02x\n",
 382                            mode, ret);
 383
 384         return ret;
 385 }
 386
 387 u16 asix_read_medium_status(struct usbnet *dev, int in_pm)
 388 {
 389         __le16 v;
 390         int ret = asix_read_cmd(dev, AX_CMD_READ_MEDIUM_STATUS,
 391                                 0, 0, 2, &v, in_pm);
 392
 393         if (ret < 0) {
 394                 netdev_err(dev->net, "Error reading Medium Status register: %02x\n",
 395                            ret);
 396                 return ret;     /* TODO: callers not checking for error ret */
 397         }
 398
 399         return le16_to_cpu(v);
 400
 401 }
 402
 403 int asix_write_medium_mode(struct usbnet *dev, u16 mode, int in_pm)
 404 {
 405         int ret;
 406
 407         netdev_dbg(dev->net, "asix_write_medium_mode() - mode = 0x%04x\n", mode);
 408         ret = asix_write_cmd(dev, AX_CMD_WRITE_MEDIUM_MODE,
 409                              mode, 0, 0, NULL, in_pm);
 410         if (ret < 0)
 411                 netdev_err(dev->net, "Failed to write Medium Mode mode to 0x%04x: %02x\n",
 412                            mode, ret);
 413
 414         return ret;
 415 }
 416
 417 /* set MAC link settings according to information from phylib */
 418 void asix_adjust_link(struct net_device *netdev)
 419 {
 420         struct phy_device *phydev = netdev->phydev;
 421         struct usbnet *dev = netdev_priv(netdev);
 422         u16 mode = 0;
 423
 424         if (phydev->link) {
 425                 mode = AX88772_MEDIUM_DEFAULT;
 426
 427                 if (phydev->duplex == DUPLEX_HALF)
 428                         mode &= ~AX_MEDIUM_FD;
 429
 430                 if (phydev->speed != SPEED_100)
 431                         mode &= ~AX_MEDIUM_PS;
 432         }
 433
 434         asix_write_medium_mode(dev, mode, 0);
 435         phy_print_status(phydev);
 436         usbnet_link_change(dev, phydev->link, 0);
 437 }
 438
 439 int asix_write_gpio(struct usbnet *dev, u16 value, int sleep, int in_pm)
 440 {
 441         int ret;
 442
 443         netdev_dbg(dev->net, "asix_write_gpio() - value = 0x%04x\n", value);
 444         ret = asix_write_cmd(dev, AX_CMD_WRITE_GPIOS, value, 0, 0, NULL, in_pm);
 445         if (ret < 0)
 446                 netdev_err(dev->net, "Failed to write GPIO value 0x%04x: %02x\n",
 447                            value, ret);
 448
 449         if (sleep)
 450                 msleep(sleep);
 451
 452         return ret;
 453 }
 454
 455 /*
 456  * AX88772 & AX88178 have a 16-bit RX_CTL value
 457  */
 458 void asix_set_multicast(struct net_device *net)
 459 {
 460         struct usbnet *dev = netdev_priv(net);
 461         struct asix_data *data = (struct asix_data *)&dev->data;
 462         u16 rx_ctl = AX_DEFAULT_RX_CTL;
 463
 464         if (net->flags & IFF_PROMISC) {
 465                 rx_ctl |= AX_RX_CTL_PRO;
 466         } else if (net->flags & IFF_ALLMULTI ||
 467                    netdev_mc_count(net) > AX_MAX_MCAST) {
 468                 rx_ctl |= AX_RX_CTL_AMALL;
 469         } else if (netdev_mc_empty(net)) {
 470                 /* just broadcast and directed */
 471         } else {
 472                 /* We use the 20 byte dev->data
 473                  * for our 8 byte filter buffer
 474                  * to avoid allocating memory that
 475                  * is tricky to free later */
 476                 struct netdev_hw_addr *ha;
 477                 u32 crc_bits;
 478
 479                 memset(data->multi_filter, 0, AX_MCAST_FILTER_SIZE);
 480
 481                 /* Build the multicast hash filter. */
 482                 netdev_for_each_mc_addr(ha, net) {
 483                         crc_bits = ether_crc(ETH_ALEN, ha->addr) >> 26;
 484                         data->multi_filter[crc_bits >> 3] |=
 485                             1 << (crc_bits & 7);
 486                 }
 487
 488                 asix_write_cmd_async(dev, AX_CMD_WRITE_MULTI_FILTER, 0, 0,
 489                                    AX_MCAST_FILTER_SIZE, data->multi_filter);
 490
 491                 rx_ctl |= AX_RX_CTL_AM;
 492         }
 493
 494         asix_write_cmd_async(dev, AX_CMD_WRITE_RX_CTL, rx_ctl, 0, 0, NULL);
 495 }
 496
 497 static int __asix_mdio_read(struct net_device *netdev, int phy_id, int loc,
 498                             bool in_pm)
 499 {
 500         struct usbnet *dev = netdev_priv(netdev);
 501         __le16 res;
 502         int ret;
 503
 504         mutex_lock(&dev->phy_mutex);
 505
 506         ret = asix_check_host_enable(dev, in_pm);
 507         if (ret == -ENODEV || ret == -ETIMEDOUT) {
 508                 mutex_unlock(&dev->phy_mutex);
 509                 return ret;
 510         }
 511
 512         ret = asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id, (__u16)loc, 2,
 513                             &res, in_pm);
 514         if (ret < 0)
 515                 goto out;
 516
 517         ret = asix_set_hw_mii(dev, in_pm);
 518 out:
 519         mutex_unlock(&dev->phy_mutex);
 520
 521         netdev_dbg(dev->net, "asix_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n",
 522                         phy_id, loc, le16_to_cpu(res));
 523
 524         return ret < 0 ? ret : le16_to_cpu(res);
 525 }
 526
 527 int asix_mdio_read(struct net_device *netdev, int phy_id, int loc)
 528 {
 529         return __asix_mdio_read(netdev, phy_id, loc, false);
 530 }
 531
 532 static int __asix_mdio_write(struct net_device *netdev, int phy_id, int loc,
 533                              int val, bool in_pm)
 534 {
 535         struct usbnet *dev = netdev_priv(netdev);
 536         __le16 res = cpu_to_le16(val);
 537         int ret;
 538
 539         netdev_dbg(dev->net, "asix_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
 540                         phy_id, loc, val);
 541
 542         mutex_lock(&dev->phy_mutex);
 543
 544         ret = asix_check_host_enable(dev, in_pm);
 545         if (ret == -ENODEV)
 546                 goto out;
 547
 548         ret = asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id, (__u16)loc, 2,
 549                              &res, in_pm);
 550         if (ret < 0)
 551                 goto out;
 552
 553         ret = asix_set_hw_mii(dev, in_pm);
 554 out:
 555         mutex_unlock(&dev->phy_mutex);
 556
 557         return ret < 0 ? ret : 0;
 558 }
 559
 560 void asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val)
 561 {
 562         __asix_mdio_write(netdev, phy_id, loc, val, false);
 563 }
 564
 565 /* MDIO read and write wrappers for phylib */
 566 int asix_mdio_bus_read(struct mii_bus *bus, int phy_id, int regnum)
 567 {
 568         struct usbnet *priv = bus->priv;
 569
 570         return __asix_mdio_read(priv->net, phy_id, regnum, false);
 571 }
 572
 573 int asix_mdio_bus_write(struct mii_bus *bus, int phy_id, int regnum, u16 val)
 574 {
 575         struct usbnet *priv = bus->priv;
 576
 577         return __asix_mdio_write(priv->net, phy_id, regnum, val, false);
 578 }
 579
 580 int asix_mdio_read_nopm(struct net_device *netdev, int phy_id, int loc)
 581 {
 582         return __asix_mdio_read(netdev, phy_id, loc, true);
 583 }
 584
 585 void
 586 asix_mdio_write_nopm(struct net_device *netdev, int phy_id, int loc, int val)
 587 {
 588         __asix_mdio_write(netdev, phy_id, loc, val, true);
 589 }
 590
 591 void asix_get_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
 592 {
 593         struct usbnet *dev = netdev_priv(net);
 594         u8 opt;
 595
 596         if (asix_read_cmd(dev, AX_CMD_READ_MONITOR_MODE,
 597                           0, 0, 1, &opt, 0) < 0) {
 598                 wolinfo->supported = 0;
 599                 wolinfo->wolopts = 0;
 600                 return;
 601         }
 602         wolinfo->supported = WAKE_PHY | WAKE_MAGIC;
 603         wolinfo->wolopts = 0;
 604         if (opt & AX_MONITOR_LINK)
 605                 wolinfo->wolopts |= WAKE_PHY;
 606         if (opt & AX_MONITOR_MAGIC)
 607                 wolinfo->wolopts |= WAKE_MAGIC;
 608 }
 609
 610 int asix_set_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
 611 {
 612         struct usbnet *dev = netdev_priv(net);
 613         u8 opt = 0;
 614
 615         if (wolinfo->wolopts & ~(WAKE_PHY | WAKE_MAGIC))
 616                 return -EINVAL;
 617
 618         if (wolinfo->wolopts & WAKE_PHY)
 619                 opt |= AX_MONITOR_LINK;
 620         if (wolinfo->wolopts & WAKE_MAGIC)
 621                 opt |= AX_MONITOR_MAGIC;
 622
 623         if (asix_write_cmd(dev, AX_CMD_WRITE_MONITOR_MODE,
 624                               opt, 0, 0, NULL, 0) < 0)
 625                 return -EINVAL;
 626
 627         return 0;
 628 }
 629
 630 int asix_get_eeprom_len(struct net_device *net)
 631 {
 632         return AX_EEPROM_LEN;
 633 }
 634
 635 int asix_get_eeprom(struct net_device *net, struct ethtool_eeprom *eeprom,
 636                     u8 *data)
 637 {
 638         struct usbnet *dev = netdev_priv(net);
 639         u16 *eeprom_buff;
 640         int first_word, last_word;
 641         int i;
 642
 643         if (eeprom->len == 0)
 644                 return -EINVAL;
 645
 646         eeprom->magic = AX_EEPROM_MAGIC;
 647
 648         first_word = eeprom->offset >> 1;
 649         last_word = (eeprom->offset + eeprom->len - 1) >> 1;
 650
 651         eeprom_buff = kmalloc_array(last_word - first_word + 1, sizeof(u16),
 652                                     GFP_KERNEL);
 653         if (!eeprom_buff)
 654                 return -ENOMEM;
 655
 656         /* ax8817x returns 2 bytes from eeprom on read */
 657         for (i = first_word; i <= last_word; i++) {
 658                 if (asix_read_cmd(dev, AX_CMD_READ_EEPROM, i, 0, 2,
 659                                   &eeprom_buff[i - first_word], 0) < 0) {
 660                         kfree(eeprom_buff);
 661                         return -EIO;
 662                 }
 663         }
 664
 665         memcpy(data, (u8 *)eeprom_buff + (eeprom->offset & 1), eeprom->len);
 666         kfree(eeprom_buff);
 667         return 0;
 668 }
 669
 670 int asix_set_eeprom(struct net_device *net, struct ethtool_eeprom *eeprom,
 671                     u8 *data)
 672 {
 673         struct usbnet *dev = netdev_priv(net);
 674         u16 *eeprom_buff;
 675         int first_word, last_word;
 676         int i;
 677         int ret;
 678
 679         netdev_dbg(net, "write EEPROM len %d, offset %d, magic 0x%x\n",
 680                    eeprom->len, eeprom->offset, eeprom->magic);
 681
 682         if (eeprom->len == 0)
 683                 return -EINVAL;
 684
 685         if (eeprom->magic != AX_EEPROM_MAGIC)
 686                 return -EINVAL;
 687
 688         first_word = eeprom->offset >> 1;
 689         last_word = (eeprom->offset + eeprom->len - 1) >> 1;
 690
 691         eeprom_buff = kmalloc_array(last_word - first_word + 1, sizeof(u16),
 692                                     GFP_KERNEL);
 693         if (!eeprom_buff)
 694                 return -ENOMEM;
 695
 696         /* align data to 16 bit boundaries, read the missing data from
 697            the EEPROM */
 698         if (eeprom->offset & 1) {
 699                 ret = asix_read_cmd(dev, AX_CMD_READ_EEPROM, first_word, 0, 2,
 700                                     &eeprom_buff[0], 0);
 701                 if (ret < 0) {
 702                         netdev_err(net, "Failed to read EEPROM at offset 0x%02x.\n", first_word);
 703                         goto free;
 704                 }
 705         }
 706
 707         if ((eeprom->offset + eeprom->len) & 1) {
 708                 ret = asix_read_cmd(dev, AX_CMD_READ_EEPROM, last_word, 0, 2,
 709                                     &eeprom_buff[last_word - first_word], 0);
 710                 if (ret < 0) {
 711                         netdev_err(net, "Failed to read EEPROM at offset 0x%02x.\n", last_word);
 712                         goto free;
 713                 }
 714         }
 715
 716         memcpy((u8 *)eeprom_buff + (eeprom->offset & 1), data, eeprom->len);
 717
 718         /* write data to EEPROM */
 719         ret = asix_write_cmd(dev, AX_CMD_WRITE_ENABLE, 0x0000, 0, 0, NULL, 0);
 720         if (ret < 0) {
 721                 netdev_err(net, "Failed to enable EEPROM write\n");
 722                 goto free;
 723         }
 724         msleep(20);
 725
 726         for (i = first_word; i <= last_word; i++) {
 727                 netdev_dbg(net, "write to EEPROM at offset 0x%02x, data 0x%04x\n",
 728                            i, eeprom_buff[i - first_word]);
 729                 ret = asix_write_cmd(dev, AX_CMD_WRITE_EEPROM, i,
 730                                      eeprom_buff[i - first_word], 0, NULL, 0);
 731                 if (ret < 0) {
 732                         netdev_err(net, "Failed to write EEPROM at offset 0x%02x.\n",
 733                                    i);
 734                         goto free;
 735                 }
 736                 msleep(20);
 737         }
 738
 739         ret = asix_write_cmd(dev, AX_CMD_WRITE_DISABLE, 0x0000, 0, 0, NULL, 0);
 740         if (ret < 0) {
 741                 netdev_err(net, "Failed to disable EEPROM write\n");
 742                 goto free;
 743         }
 744
 745         ret = 0;
 746 free:
 747         kfree(eeprom_buff);
 748         return ret;
 749 }
 750
 751 void asix_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
 752 {
 753         /* Inherit standard device info */
 754         usbnet_get_drvinfo(net, info);
 755         strscpy(info->driver, DRIVER_NAME, sizeof(info->driver));
 756         strscpy(info->version, DRIVER_VERSION, sizeof(info->version));
 757 }
 758
 759 int asix_set_mac_address(struct net_device *net, void *p)
 760 {
 761         struct usbnet *dev = netdev_priv(net);
 762         struct asix_data *data = (struct asix_data *)&dev->data;
 763         struct sockaddr *addr = p;
 764
 765         if (netif_running(net))
 766                 return -EBUSY;
 767         if (!is_valid_ether_addr(addr->sa_data))
 768                 return -EADDRNOTAVAIL;
 769
 770         eth_hw_addr_set(net, addr->sa_data);
 771
 772         /* We use the 20 byte dev->data
 773          * for our 6 byte mac buffer
 774          * to avoid allocating memory that
 775          * is tricky to free later */
 776         memcpy(data->mac_addr, addr->sa_data, ETH_ALEN);
 777         asix_write_cmd_async(dev, AX_CMD_WRITE_NODE_ID, 0, 0, ETH_ALEN,
 778                                                         data->mac_addr);
 779
 780         return 0;
 781 }