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)
  26 {
  27         int ret;
  28         ret = usbnet_read_cmd(dev, cmd,
  29                                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  30                                value, index, data, size);
  31
  32         if (ret != size && ret >= 0)
  33                 return -EINVAL;
  34         return ret;
  35 }
  36
  37 int asix_write_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
  38                    u16 size, void *data)
  39 {
  40         return usbnet_write_cmd(dev, cmd,
  41                                 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  42                                 value, index, data, size);
  43 }
  44
  45 void asix_write_cmd_async(struct usbnet *dev, u8 cmd, u16 value, u16 index,
  46                           u16 size, void *data)
  47 {
  48         usbnet_write_cmd_async(dev, cmd,
  49                                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  50                                value, index, data, size);
  51 }
  52
  53 int asix_rx_fixup_internal(struct usbnet *dev, struct sk_buff *skb,
  54                            struct asix_rx_fixup_info *rx)
  55 {
  56         int offset = 0;
  57
  58         while (offset + sizeof(u16) <= skb->len) {
  59                 u16 remaining = 0;
  60                 unsigned char *data;
  61
  62                 if (!rx->size) {
  63                         if ((skb->len - offset == sizeof(u16)) ||
  64                             rx->split_head) {
  65                                 if(!rx->split_head) {
  66                                         rx->header = get_unaligned_le16(
  67                                                         skb->data + offset);
  68                                         rx->split_head = true;
  69                                         offset += sizeof(u16);
  70                                         break;
  71                                 } else {
  72                                         rx->header |= (get_unaligned_le16(
  73                                                         skb->data + offset)
  74                                                         << 16);
  75                                         rx->split_head = false;
  76                                         offset += sizeof(u16);
  77                                 }
  78                         } else {
  79                                 rx->header = get_unaligned_le32(skb->data +
  80                                                                 offset);
  81                                 offset += sizeof(u32);
  82                         }
  83
  84                         /* get the packet length */
  85                         rx->size = (u16) (rx->header & 0x7ff);
  86                         if (rx->size != ((~rx->header >> 16) & 0x7ff)) {
  87                                 netdev_err(dev->net, "asix_rx_fixup() Bad Header Length 0x%x, offset %d\n",
  88                                            rx->header, offset);
  89                                 rx->size = 0;
  90                                 return 0;
  91                         }
  92                         rx->ax_skb = netdev_alloc_skb_ip_align(dev->net,
  93                                                                rx->size);
  94                         if (!rx->ax_skb)
  95                                 return 0;
  96                 }
  97
  98                 if (rx->size > dev->net->mtu + ETH_HLEN + VLAN_HLEN) {
  99                         netdev_err(dev->net, "asix_rx_fixup() Bad RX Length %d\n",
 100                                    rx->size);
 101                         kfree_skb(rx->ax_skb);
 102                         rx->ax_skb = NULL;
 103                         rx->size = 0U;
 104
 105                         return 0;
 106                 }
 107
 108                 if (rx->size > skb->len - offset) {
 109                         remaining = rx->size - (skb->len - offset);
 110                         rx->size = skb->len - offset;
 111                 }
 112
 113                 data = skb_put(rx->ax_skb, rx->size);
 114                 memcpy(data, skb->data + offset, rx->size);
 115                 if (!remaining)
 116                         usbnet_skb_return(dev, rx->ax_skb);
 117
 118                 offset += (rx->size + 1) & 0xfffe;
 119                 rx->size = remaining;
 120         }
 121
 122         if (skb->len != offset) {
 123                 netdev_err(dev->net, "asix_rx_fixup() Bad SKB Length %d, %d\n",
 124                            skb->len, offset);
 125                 return 0;
 126         }
 127
 128         return 1;
 129 }
 130
 131 int asix_rx_fixup_common(struct usbnet *dev, struct sk_buff *skb)
 132 {
 133         struct asix_common_private *dp = dev->driver_priv;
 134         struct asix_rx_fixup_info *rx = &dp->rx_fixup_info;
 135
 136         return asix_rx_fixup_internal(dev, skb, rx);
 137 }
 138
 139 struct sk_buff *asix_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
 140                               gfp_t flags)
 141 {
 142         int padlen;
 143         int headroom = skb_headroom(skb);
 144         int tailroom = skb_tailroom(skb);
 145         u32 packet_len;
 146         u32 padbytes = 0xffff0000;
 147
 148         padlen = ((skb->len + 4) & (dev->maxpacket - 1)) ? 0 : 4;
 149
 150         /* We need to push 4 bytes in front of frame (packet_len)
 151          * and maybe add 4 bytes after the end (if padlen is 4)
 152          *
 153          * Avoid skb_copy_expand() expensive call, using following rules :
 154          * - We are allowed to push 4 bytes in headroom if skb_header_cloned()
 155          *   is false (and if we have 4 bytes of headroom)
 156          * - We are allowed to put 4 bytes at tail if skb_cloned()
 157          *   is false (and if we have 4 bytes of tailroom)
 158          *
 159          * TCP packets for example are cloned, but skb_header_release()
 160          * was called in tcp stack, allowing us to use headroom for our needs.
 161          */
 162         if (!skb_header_cloned(skb) &&
 163             !(padlen && skb_cloned(skb)) &&
 164             headroom + tailroom >= 4 + padlen) {
 165                 /* following should not happen, but better be safe */
 166                 if (headroom < 4 ||
 167                     tailroom < padlen) {
 168                         skb->data = memmove(skb->head + 4, skb->data, skb->len);
 169                         skb_set_tail_pointer(skb, skb->len);
 170                 }
 171         } else {
 172                 struct sk_buff *skb2;
 173
 174                 skb2 = skb_copy_expand(skb, 4, padlen, flags);
 175                 dev_kfree_skb_any(skb);
 176                 skb = skb2;
 177                 if (!skb)
 178                         return NULL;
 179         }
 180
 181         packet_len = ((skb->len ^ 0x0000ffff) << 16) + skb->len;
 182         skb_push(skb, 4);
 183         cpu_to_le32s(&packet_len);
 184         skb_copy_to_linear_data(skb, &packet_len, sizeof(packet_len));
 185
 186         if (padlen) {
 187                 cpu_to_le32s(&padbytes);
 188                 memcpy(skb_tail_pointer(skb), &padbytes, sizeof(padbytes));
 189                 skb_put(skb, sizeof(padbytes));
 190         }
 191
 192         usbnet_set_skb_tx_stats(skb, 1, 0);
 193         return skb;
 194 }
 195
 196 int asix_set_sw_mii(struct usbnet *dev)
 197 {
 198         int ret;
 199         ret = asix_write_cmd(dev, AX_CMD_SET_SW_MII, 0x0000, 0, 0, NULL);
 200         if (ret < 0)
 201                 netdev_err(dev->net, "Failed to enable software MII access\n");
 202         return ret;
 203 }
 204
 205 int asix_set_hw_mii(struct usbnet *dev)
 206 {
 207         int ret;
 208         ret = asix_write_cmd(dev, AX_CMD_SET_HW_MII, 0x0000, 0, 0, NULL);
 209         if (ret < 0)
 210                 netdev_err(dev->net, "Failed to enable hardware MII access\n");
 211         return ret;
 212 }
 213
 214 int asix_read_phy_addr(struct usbnet *dev, int internal)
 215 {
 216         int offset = (internal ? 1 : 0);
 217         u8 buf[2];
 218         int ret = asix_read_cmd(dev, AX_CMD_READ_PHY_ID, 0, 0, 2, buf);
 219
 220         netdev_dbg(dev->net, "asix_get_phy_addr()\n");
 221
 222         if (ret < 0) {
 223                 netdev_err(dev->net, "Error reading PHYID register: %02x\n", ret);
 224                 goto out;
 225         }
 226         netdev_dbg(dev->net, "asix_get_phy_addr() returning 0x%04x\n",
 227                    *((__le16 *)buf));
 228         ret = buf[offset];
 229
 230 out:
 231         return ret;
 232 }
 233
 234 int asix_get_phy_addr(struct usbnet *dev)
 235 {
 236         /* return the address of the internal phy */
 237         return asix_read_phy_addr(dev, 1);
 238 }
 239
 240
 241 int asix_sw_reset(struct usbnet *dev, u8 flags)
 242 {
 243         int ret;
 244
 245         ret = asix_write_cmd(dev, AX_CMD_SW_RESET, flags, 0, 0, NULL);
 246         if (ret < 0)
 247                 netdev_err(dev->net, "Failed to send software reset: %02x\n", ret);
 248
 249         return ret;
 250 }
 251
 252 u16 asix_read_rx_ctl(struct usbnet *dev)
 253 {
 254         __le16 v;
 255         int ret = asix_read_cmd(dev, AX_CMD_READ_RX_CTL, 0, 0, 2, &v);
 256
 257         if (ret < 0) {
 258                 netdev_err(dev->net, "Error reading RX_CTL register: %02x\n", ret);
 259                 goto out;
 260         }
 261         ret = le16_to_cpu(v);
 262 out:
 263         return ret;
 264 }
 265
 266 int asix_write_rx_ctl(struct usbnet *dev, u16 mode)
 267 {
 268         int ret;
 269
 270         netdev_dbg(dev->net, "asix_write_rx_ctl() - mode = 0x%04x\n", mode);
 271         ret = asix_write_cmd(dev, AX_CMD_WRITE_RX_CTL, mode, 0, 0, NULL);
 272         if (ret < 0)
 273                 netdev_err(dev->net, "Failed to write RX_CTL mode to 0x%04x: %02x\n",
 274                            mode, ret);
 275
 276         return ret;
 277 }
 278
 279 u16 asix_read_medium_status(struct usbnet *dev)
 280 {
 281         __le16 v;
 282         int ret = asix_read_cmd(dev, AX_CMD_READ_MEDIUM_STATUS, 0, 0, 2, &v);
 283
 284         if (ret < 0) {
 285                 netdev_err(dev->net, "Error reading Medium Status register: %02x\n",
 286                            ret);
 287                 return ret;     /* TODO: callers not checking for error ret */
 288         }
 289
 290         return le16_to_cpu(v);
 291
 292 }
 293
 294 int asix_write_medium_mode(struct usbnet *dev, u16 mode)
 295 {
 296         int ret;
 297
 298         netdev_dbg(dev->net, "asix_write_medium_mode() - mode = 0x%04x\n", mode);
 299         ret = asix_write_cmd(dev, AX_CMD_WRITE_MEDIUM_MODE, mode, 0, 0, NULL);
 300         if (ret < 0)
 301                 netdev_err(dev->net, "Failed to write Medium Mode mode to 0x%04x: %02x\n",
 302                            mode, ret);
 303
 304         return ret;
 305 }
 306
 307 int asix_write_gpio(struct usbnet *dev, u16 value, int sleep)
 308 {
 309         int ret;
 310
 311         netdev_dbg(dev->net, "asix_write_gpio() - value = 0x%04x\n", value);
 312         ret = asix_write_cmd(dev, AX_CMD_WRITE_GPIOS, value, 0, 0, NULL);
 313         if (ret < 0)
 314                 netdev_err(dev->net, "Failed to write GPIO value 0x%04x: %02x\n",
 315                            value, ret);
 316
 317         if (sleep)
 318                 msleep(sleep);
 319
 320         return ret;
 321 }
 322
 323 /*
 324  * AX88772 & AX88178 have a 16-bit RX_CTL value
 325  */
 326 void asix_set_multicast(struct net_device *net)
 327 {
 328         struct usbnet *dev = netdev_priv(net);
 329         struct asix_data *data = (struct asix_data *)&dev->data;
 330         u16 rx_ctl = AX_DEFAULT_RX_CTL;
 331
 332         if (net->flags & IFF_PROMISC) {
 333                 rx_ctl |= AX_RX_CTL_PRO;
 334         } else if (net->flags & IFF_ALLMULTI ||
 335                    netdev_mc_count(net) > AX_MAX_MCAST) {
 336                 rx_ctl |= AX_RX_CTL_AMALL;
 337         } else if (netdev_mc_empty(net)) {
 338                 /* just broadcast and directed */
 339         } else {
 340                 /* We use the 20 byte dev->data
 341                  * for our 8 byte filter buffer
 342                  * to avoid allocating memory that
 343                  * is tricky to free later */
 344                 struct netdev_hw_addr *ha;
 345                 u32 crc_bits;
 346
 347                 memset(data->multi_filter, 0, AX_MCAST_FILTER_SIZE);
 348
 349                 /* Build the multicast hash filter. */
 350                 netdev_for_each_mc_addr(ha, net) {
 351                         crc_bits = ether_crc(ETH_ALEN, ha->addr) >> 26;
 352                         data->multi_filter[crc_bits >> 3] |=
 353                             1 << (crc_bits & 7);
 354                 }
 355
 356                 asix_write_cmd_async(dev, AX_CMD_WRITE_MULTI_FILTER, 0, 0,
 357                                    AX_MCAST_FILTER_SIZE, data->multi_filter);
 358
 359                 rx_ctl |= AX_RX_CTL_AM;
 360         }
 361
 362         asix_write_cmd_async(dev, AX_CMD_WRITE_RX_CTL, rx_ctl, 0, 0, NULL);
 363 }
 364
 365 int asix_mdio_read(struct net_device *netdev, int phy_id, int loc)
 366 {
 367         struct usbnet *dev = netdev_priv(netdev);
 368         __le16 res;
 369
 370         mutex_lock(&dev->phy_mutex);
 371         asix_set_sw_mii(dev);
 372         asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
 373                                 (__u16)loc, 2, &res);
 374         asix_set_hw_mii(dev);
 375         mutex_unlock(&dev->phy_mutex);
 376
 377         netdev_dbg(dev->net, "asix_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n",
 378                    phy_id, loc, le16_to_cpu(res));
 379
 380         return le16_to_cpu(res);
 381 }
 382
 383 void asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val)
 384 {
 385         struct usbnet *dev = netdev_priv(netdev);
 386         __le16 res = cpu_to_le16(val);
 387
 388         netdev_dbg(dev->net, "asix_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
 389                    phy_id, loc, val);
 390         mutex_lock(&dev->phy_mutex);
 391         asix_set_sw_mii(dev);
 392         asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id, (__u16)loc, 2, &res);
 393         asix_set_hw_mii(dev);
 394         mutex_unlock(&dev->phy_mutex);
 395 }
 396
 397 void asix_get_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
 398 {
 399         struct usbnet *dev = netdev_priv(net);
 400         u8 opt;
 401
 402         if (asix_read_cmd(dev, AX_CMD_READ_MONITOR_MODE, 0, 0, 1, &opt) < 0) {
 403                 wolinfo->supported = 0;
 404                 wolinfo->wolopts = 0;
 405                 return;
 406         }
 407         wolinfo->supported = WAKE_PHY | WAKE_MAGIC;
 408         wolinfo->wolopts = 0;
 409         if (opt & AX_MONITOR_LINK)
 410                 wolinfo->wolopts |= WAKE_PHY;
 411         if (opt & AX_MONITOR_MAGIC)
 412                 wolinfo->wolopts |= WAKE_MAGIC;
 413 }
 414
 415 int asix_set_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
 416 {
 417         struct usbnet *dev = netdev_priv(net);
 418         u8 opt = 0;
 419
 420         if (wolinfo->wolopts & WAKE_PHY)
 421                 opt |= AX_MONITOR_LINK;
 422         if (wolinfo->wolopts & WAKE_MAGIC)
 423                 opt |= AX_MONITOR_MAGIC;
 424
 425         if (asix_write_cmd(dev, AX_CMD_WRITE_MONITOR_MODE,
 426                               opt, 0, 0, NULL) < 0)
 427                 return -EINVAL;
 428
 429         return 0;
 430 }
 431
 432 int asix_get_eeprom_len(struct net_device *net)
 433 {
 434         return AX_EEPROM_LEN;
 435 }
 436
 437 int asix_get_eeprom(struct net_device *net, struct ethtool_eeprom *eeprom,
 438                     u8 *data)
 439 {
 440         struct usbnet *dev = netdev_priv(net);
 441         u16 *eeprom_buff;
 442         int first_word, last_word;
 443         int i;
 444
 445         if (eeprom->len == 0)
 446                 return -EINVAL;
 447
 448         eeprom->magic = AX_EEPROM_MAGIC;
 449
 450         first_word = eeprom->offset >> 1;
 451         last_word = (eeprom->offset + eeprom->len - 1) >> 1;
 452
 453         eeprom_buff = kmalloc(sizeof(u16) * (last_word - first_word + 1),
 454                               GFP_KERNEL);
 455         if (!eeprom_buff)
 456                 return -ENOMEM;
 457
 458         /* ax8817x returns 2 bytes from eeprom on read */
 459         for (i = first_word; i <= last_word; i++) {
 460                 if (asix_read_cmd(dev, AX_CMD_READ_EEPROM, i, 0, 2,
 461                                   &(eeprom_buff[i - first_word])) < 0) {
 462                         kfree(eeprom_buff);
 463                         return -EIO;
 464                 }
 465         }
 466
 467         memcpy(data, (u8 *)eeprom_buff + (eeprom->offset & 1), eeprom->len);
 468         kfree(eeprom_buff);
 469         return 0;
 470 }
 471
 472 int asix_set_eeprom(struct net_device *net, struct ethtool_eeprom *eeprom,
 473                     u8 *data)
 474 {
 475         struct usbnet *dev = netdev_priv(net);
 476         u16 *eeprom_buff;
 477         int first_word, last_word;
 478         int i;
 479         int ret;
 480
 481         netdev_dbg(net, "write EEPROM len %d, offset %d, magic 0x%x\n",
 482                    eeprom->len, eeprom->offset, eeprom->magic);
 483
 484         if (eeprom->len == 0)
 485                 return -EINVAL;
 486
 487         if (eeprom->magic != AX_EEPROM_MAGIC)
 488                 return -EINVAL;
 489
 490         first_word = eeprom->offset >> 1;
 491         last_word = (eeprom->offset + eeprom->len - 1) >> 1;
 492
 493         eeprom_buff = kmalloc(sizeof(u16) * (last_word - first_word + 1),
 494                               GFP_KERNEL);
 495         if (!eeprom_buff)
 496                 return -ENOMEM;
 497
 498         /* align data to 16 bit boundaries, read the missing data from
 499            the EEPROM */
 500         if (eeprom->offset & 1) {
 501                 ret = asix_read_cmd(dev, AX_CMD_READ_EEPROM, first_word, 0, 2,
 502                                     &(eeprom_buff[0]));
 503                 if (ret < 0) {
 504                         netdev_err(net, "Failed to read EEPROM at offset 0x%02x.\n", first_word);
 505                         goto free;
 506                 }
 507         }
 508
 509         if ((eeprom->offset + eeprom->len) & 1) {
 510                 ret = asix_read_cmd(dev, AX_CMD_READ_EEPROM, last_word, 0, 2,
 511                                     &(eeprom_buff[last_word - first_word]));
 512                 if (ret < 0) {
 513                         netdev_err(net, "Failed to read EEPROM at offset 0x%02x.\n", last_word);
 514                         goto free;
 515                 }
 516         }
 517
 518         memcpy((u8 *)eeprom_buff + (eeprom->offset & 1), data, eeprom->len);
 519
 520         /* write data to EEPROM */
 521         ret = asix_write_cmd(dev, AX_CMD_WRITE_ENABLE, 0x0000, 0, 0, NULL);
 522         if (ret < 0) {
 523                 netdev_err(net, "Failed to enable EEPROM write\n");
 524                 goto free;
 525         }
 526         msleep(20);
 527
 528         for (i = first_word; i <= last_word; i++) {
 529                 netdev_dbg(net, "write to EEPROM at offset 0x%02x, data 0x%04x\n",
 530                            i, eeprom_buff[i - first_word]);
 531                 ret = asix_write_cmd(dev, AX_CMD_WRITE_EEPROM, i,
 532                                      eeprom_buff[i - first_word], 0, NULL);
 533                 if (ret < 0) {
 534                         netdev_err(net, "Failed to write EEPROM at offset 0x%02x.\n",
 535                                    i);
 536                         goto free;
 537                 }
 538                 msleep(20);
 539         }
 540
 541         ret = asix_write_cmd(dev, AX_CMD_WRITE_DISABLE, 0x0000, 0, 0, NULL);
 542         if (ret < 0) {
 543                 netdev_err(net, "Failed to disable EEPROM write\n");
 544                 goto free;
 545         }
 546
 547         ret = 0;
 548 free:
 549         kfree(eeprom_buff);
 550         return ret;
 551 }
 552
 553 void asix_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
 554 {
 555         /* Inherit standard device info */
 556         usbnet_get_drvinfo(net, info);
 557         strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
 558         strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
 559         info->eedump_len = AX_EEPROM_LEN;
 560 }
 561
 562 int asix_set_mac_address(struct net_device *net, void *p)
 563 {
 564         struct usbnet *dev = netdev_priv(net);
 565         struct asix_data *data = (struct asix_data *)&dev->data;
 566         struct sockaddr *addr = p;
 567
 568         if (netif_running(net))
 569                 return -EBUSY;
 570         if (!is_valid_ether_addr(addr->sa_data))
 571                 return -EADDRNOTAVAIL;
 572
 573         memcpy(net->dev_addr, addr->sa_data, ETH_ALEN);
 574
 575         /* We use the 20 byte dev->data
 576          * for our 6 byte mac buffer
 577          * to avoid allocating memory that
 578          * is tricky to free later */
 579         memcpy(data->mac_addr, addr->sa_data, ETH_ALEN);
 580         asix_write_cmd_async(dev, AX_CMD_WRITE_NODE_ID, 0, 0, ETH_ALEN,
 581                                                         data->mac_addr);
 582
 583         return 0;
 584 }