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, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include "asix.h"
  24
  25 int asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
  26                   u16 size, void *data)
  27 {
  28         int ret;
  29         ret = usbnet_read_cmd(dev, cmd,
  30                                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  31                                value, index, data, size);
  32
  33         if (ret != size && ret >= 0)
  34                 return -EINVAL;
  35         return ret;
  36 }
  37
  38 int asix_write_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
  39                    u16 size, void *data)
  40 {
  41         return usbnet_write_cmd(dev, cmd,
  42                                 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  43                                 value, index, data, size);
  44 }
  45
  46 void asix_write_cmd_async(struct usbnet *dev, u8 cmd, u16 value, u16 index,
  47                           u16 size, void *data)
  48 {
  49         usbnet_write_cmd_async(dev, cmd,
  50                                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  51                                value, index, data, size);
  52 }
  53
  54 int asix_rx_fixup_internal(struct usbnet *dev, struct sk_buff *skb,
  55                            struct asix_rx_fixup_info *rx)
  56 {
  57         int offset = 0;
  58
  59         while (offset + sizeof(u16) <= skb->len) {
  60                 u16 remaining = 0;
  61                 unsigned char *data;
  62
  63                 if (!rx->size) {
  64                         if ((skb->len - offset == sizeof(u16)) ||
  65                             rx->split_head) {
  66                                 if(!rx->split_head) {
  67                                         rx->header = get_unaligned_le16(
  68                                                         skb->data + offset);
  69                                         rx->split_head = true;
  70                                         offset += sizeof(u16);
  71                                         break;
  72                                 } else {
  73                                         rx->header |= (get_unaligned_le16(
  74                                                         skb->data + offset)
  75                                                         << 16);
  76                                         rx->split_head = false;
  77                                         offset += sizeof(u16);
  78                                 }
  79                         } else {
  80                                 rx->header = get_unaligned_le32(skb->data +
  81                                                                 offset);
  82                                 offset += sizeof(u32);
  83                         }
  84
  85                         /* get the packet length */
  86                         rx->size = (u16) (rx->header & 0x7ff);
  87                         if (rx->size != ((~rx->header >> 16) & 0x7ff)) {
  88                                 netdev_err(dev->net, "asix_rx_fixup() Bad Header Length 0x%x, offset %d\n",
  89                                            rx->header, offset);
  90                                 rx->size = 0;
  91                                 return 0;
  92                         }
  93                         rx->ax_skb = netdev_alloc_skb_ip_align(dev->net,
  94                                                                rx->size);
  95                         if (!rx->ax_skb)
  96                                 return 0;
  97                 }
  98
  99                 if (rx->size > dev->net->mtu + ETH_HLEN + VLAN_HLEN) {
 100                         netdev_err(dev->net, "asix_rx_fixup() Bad RX Length %d\n",
 101                                    rx->size);
 102                         kfree_skb(rx->ax_skb);
 103                         rx->ax_skb = NULL;
 104                         rx->size = 0U;
 105
 106                         return 0;
 107                 }
 108
 109                 if (rx->size > skb->len - offset) {
 110                         remaining = rx->size - (skb->len - offset);
 111                         rx->size = skb->len - offset;
 112                 }
 113
 114                 data = skb_put(rx->ax_skb, rx->size);
 115                 memcpy(data, skb->data + offset, rx->size);
 116                 if (!remaining)
 117                         usbnet_skb_return(dev, rx->ax_skb);
 118
 119                 offset += (rx->size + 1) & 0xfffe;
 120                 rx->size = remaining;
 121         }
 122
 123         if (skb->len != offset) {
 124                 netdev_err(dev->net, "asix_rx_fixup() Bad SKB Length %d, %d\n",
 125                            skb->len, offset);
 126                 return 0;
 127         }
 128
 129         return 1;
 130 }
 131
 132 int asix_rx_fixup_common(struct usbnet *dev, struct sk_buff *skb)
 133 {
 134         struct asix_common_private *dp = dev->driver_priv;
 135         struct asix_rx_fixup_info *rx = &dp->rx_fixup_info;
 136
 137         return asix_rx_fixup_internal(dev, skb, rx);
 138 }
 139
 140 struct sk_buff *asix_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
 141                               gfp_t flags)
 142 {
 143         int padlen;
 144         int headroom = skb_headroom(skb);
 145         int tailroom = skb_tailroom(skb);
 146         u32 packet_len;
 147         u32 padbytes = 0xffff0000;
 148
 149         padlen = ((skb->len + 4) & (dev->maxpacket - 1)) ? 0 : 4;
 150
 151         /* We need to push 4 bytes in front of frame (packet_len)
 152          * and maybe add 4 bytes after the end (if padlen is 4)
 153          *
 154          * Avoid skb_copy_expand() expensive call, using following rules :
 155          * - We are allowed to push 4 bytes in headroom if skb_header_cloned()
 156          *   is false (and if we have 4 bytes of headroom)
 157          * - We are allowed to put 4 bytes at tail if skb_cloned()
 158          *   is false (and if we have 4 bytes of tailroom)
 159          *
 160          * TCP packets for example are cloned, but skb_header_release()
 161          * was called in tcp stack, allowing us to use headroom for our needs.
 162          */
 163         if (!skb_header_cloned(skb) &&
 164             !(padlen && skb_cloned(skb)) &&
 165             headroom + tailroom >= 4 + padlen) {
 166                 /* following should not happen, but better be safe */
 167                 if (headroom < 4 ||
 168                     tailroom < padlen) {
 169                         skb->data = memmove(skb->head + 4, skb->data, skb->len);
 170                         skb_set_tail_pointer(skb, skb->len);
 171                 }
 172         } else {
 173                 struct sk_buff *skb2;
 174
 175                 skb2 = skb_copy_expand(skb, 4, padlen, flags);
 176                 dev_kfree_skb_any(skb);
 177                 skb = skb2;
 178                 if (!skb)
 179                         return NULL;
 180         }
 181
 182         packet_len = ((skb->len ^ 0x0000ffff) << 16) + skb->len;
 183         skb_push(skb, 4);
 184         cpu_to_le32s(&packet_len);
 185         skb_copy_to_linear_data(skb, &packet_len, sizeof(packet_len));
 186
 187         if (padlen) {
 188                 cpu_to_le32s(&padbytes);
 189                 memcpy(skb_tail_pointer(skb), &padbytes, sizeof(padbytes));
 190                 skb_put(skb, sizeof(padbytes));
 191         }
 192         return skb;
 193 }
 194
 195 int asix_set_sw_mii(struct usbnet *dev)
 196 {
 197         int ret;
 198         ret = asix_write_cmd(dev, AX_CMD_SET_SW_MII, 0x0000, 0, 0, NULL);
 199         if (ret < 0)
 200                 netdev_err(dev->net, "Failed to enable software MII access\n");
 201         return ret;
 202 }
 203
 204 int asix_set_hw_mii(struct usbnet *dev)
 205 {
 206         int ret;
 207         ret = asix_write_cmd(dev, AX_CMD_SET_HW_MII, 0x0000, 0, 0, NULL);
 208         if (ret < 0)
 209                 netdev_err(dev->net, "Failed to enable hardware MII access\n");
 210         return ret;
 211 }
 212
 213 int asix_read_phy_addr(struct usbnet *dev, int internal)
 214 {
 215         int offset = (internal ? 1 : 0);
 216         u8 buf[2];
 217         int ret = asix_read_cmd(dev, AX_CMD_READ_PHY_ID, 0, 0, 2, buf);
 218
 219         netdev_dbg(dev->net, "asix_get_phy_addr()\n");
 220
 221         if (ret < 0) {
 222                 netdev_err(dev->net, "Error reading PHYID register: %02x\n", ret);
 223                 goto out;
 224         }
 225         netdev_dbg(dev->net, "asix_get_phy_addr() returning 0x%04x\n",
 226                    *((__le16 *)buf));
 227         ret = buf[offset];
 228
 229 out:
 230         return ret;
 231 }
 232
 233 int asix_get_phy_addr(struct usbnet *dev)
 234 {
 235         /* return the address of the internal phy */
 236         return asix_read_phy_addr(dev, 1);
 237 }
 238
 239
 240 int asix_sw_reset(struct usbnet *dev, u8 flags)
 241 {
 242         int ret;
 243
 244         ret = asix_write_cmd(dev, AX_CMD_SW_RESET, flags, 0, 0, NULL);
 245         if (ret < 0)
 246                 netdev_err(dev->net, "Failed to send software reset: %02x\n", ret);
 247
 248         return ret;
 249 }
 250
 251 u16 asix_read_rx_ctl(struct usbnet *dev)
 252 {
 253         __le16 v;
 254         int ret = asix_read_cmd(dev, AX_CMD_READ_RX_CTL, 0, 0, 2, &v);
 255
 256         if (ret < 0) {
 257                 netdev_err(dev->net, "Error reading RX_CTL register: %02x\n", ret);
 258                 goto out;
 259         }
 260         ret = le16_to_cpu(v);
 261 out:
 262         return ret;
 263 }
 264
 265 int asix_write_rx_ctl(struct usbnet *dev, u16 mode)
 266 {
 267         int ret;
 268
 269         netdev_dbg(dev->net, "asix_write_rx_ctl() - mode = 0x%04x\n", mode);
 270         ret = asix_write_cmd(dev, AX_CMD_WRITE_RX_CTL, mode, 0, 0, NULL);
 271         if (ret < 0)
 272                 netdev_err(dev->net, "Failed to write RX_CTL mode to 0x%04x: %02x\n",
 273                            mode, ret);
 274
 275         return ret;
 276 }
 277
 278 u16 asix_read_medium_status(struct usbnet *dev)
 279 {
 280         __le16 v;
 281         int ret = asix_read_cmd(dev, AX_CMD_READ_MEDIUM_STATUS, 0, 0, 2, &v);
 282
 283         if (ret < 0) {
 284                 netdev_err(dev->net, "Error reading Medium Status register: %02x\n",
 285                            ret);
 286                 return ret;     /* TODO: callers not checking for error ret */
 287         }
 288
 289         return le16_to_cpu(v);
 290
 291 }
 292
 293 int asix_write_medium_mode(struct usbnet *dev, u16 mode)
 294 {
 295         int ret;
 296
 297         netdev_dbg(dev->net, "asix_write_medium_mode() - mode = 0x%04x\n", mode);
 298         ret = asix_write_cmd(dev, AX_CMD_WRITE_MEDIUM_MODE, mode, 0, 0, NULL);
 299         if (ret < 0)
 300                 netdev_err(dev->net, "Failed to write Medium Mode mode to 0x%04x: %02x\n",
 301                            mode, ret);
 302
 303         return ret;
 304 }
 305
 306 int asix_write_gpio(struct usbnet *dev, u16 value, int sleep)
 307 {
 308         int ret;
 309
 310         netdev_dbg(dev->net, "asix_write_gpio() - value = 0x%04x\n", value);
 311         ret = asix_write_cmd(dev, AX_CMD_WRITE_GPIOS, value, 0, 0, NULL);
 312         if (ret < 0)
 313                 netdev_err(dev->net, "Failed to write GPIO value 0x%04x: %02x\n",
 314                            value, ret);
 315
 316         if (sleep)
 317                 msleep(sleep);
 318
 319         return ret;
 320 }
 321
 322 /*
 323  * AX88772 & AX88178 have a 16-bit RX_CTL value
 324  */
 325 void asix_set_multicast(struct net_device *net)
 326 {
 327         struct usbnet *dev = netdev_priv(net);
 328         struct asix_data *data = (struct asix_data *)&dev->data;
 329         u16 rx_ctl = AX_DEFAULT_RX_CTL;
 330
 331         if (net->flags & IFF_PROMISC) {
 332                 rx_ctl |= AX_RX_CTL_PRO;
 333         } else if (net->flags & IFF_ALLMULTI ||
 334                    netdev_mc_count(net) > AX_MAX_MCAST) {
 335                 rx_ctl |= AX_RX_CTL_AMALL;
 336         } else if (netdev_mc_empty(net)) {
 337                 /* just broadcast and directed */
 338         } else {
 339                 /* We use the 20 byte dev->data
 340                  * for our 8 byte filter buffer
 341                  * to avoid allocating memory that
 342                  * is tricky to free later */
 343                 struct netdev_hw_addr *ha;
 344                 u32 crc_bits;
 345
 346                 memset(data->multi_filter, 0, AX_MCAST_FILTER_SIZE);
 347
 348                 /* Build the multicast hash filter. */
 349                 netdev_for_each_mc_addr(ha, net) {
 350                         crc_bits = ether_crc(ETH_ALEN, ha->addr) >> 26;
 351                         data->multi_filter[crc_bits >> 3] |=
 352                             1 << (crc_bits & 7);
 353                 }
 354
 355                 asix_write_cmd_async(dev, AX_CMD_WRITE_MULTI_FILTER, 0, 0,
 356                                    AX_MCAST_FILTER_SIZE, data->multi_filter);
 357
 358                 rx_ctl |= AX_RX_CTL_AM;
 359         }
 360
 361         asix_write_cmd_async(dev, AX_CMD_WRITE_RX_CTL, rx_ctl, 0, 0, NULL);
 362 }
 363
 364 int asix_mdio_read(struct net_device *netdev, int phy_id, int loc)
 365 {
 366         struct usbnet *dev = netdev_priv(netdev);
 367         __le16 res;
 368
 369         mutex_lock(&dev->phy_mutex);
 370         asix_set_sw_mii(dev);
 371         asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
 372                                 (__u16)loc, 2, &res);
 373         asix_set_hw_mii(dev);
 374         mutex_unlock(&dev->phy_mutex);
 375
 376         netdev_dbg(dev->net, "asix_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n",
 377                    phy_id, loc, le16_to_cpu(res));
 378
 379         return le16_to_cpu(res);
 380 }
 381
 382 void asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val)
 383 {
 384         struct usbnet *dev = netdev_priv(netdev);
 385         __le16 res = cpu_to_le16(val);
 386
 387         netdev_dbg(dev->net, "asix_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
 388                    phy_id, loc, val);
 389         mutex_lock(&dev->phy_mutex);
 390         asix_set_sw_mii(dev);
 391         asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id, (__u16)loc, 2, &res);
 392         asix_set_hw_mii(dev);
 393         mutex_unlock(&dev->phy_mutex);
 394 }
 395
 396 void asix_get_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
 397 {
 398         struct usbnet *dev = netdev_priv(net);
 399         u8 opt;
 400
 401         if (asix_read_cmd(dev, AX_CMD_READ_MONITOR_MODE, 0, 0, 1, &opt) < 0) {
 402                 wolinfo->supported = 0;
 403                 wolinfo->wolopts = 0;
 404                 return;
 405         }
 406         wolinfo->supported = WAKE_PHY | WAKE_MAGIC;
 407         wolinfo->wolopts = 0;
 408         if (opt & AX_MONITOR_LINK)
 409                 wolinfo->wolopts |= WAKE_PHY;
 410         if (opt & AX_MONITOR_MAGIC)
 411                 wolinfo->wolopts |= WAKE_MAGIC;
 412 }
 413
 414 int asix_set_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
 415 {
 416         struct usbnet *dev = netdev_priv(net);
 417         u8 opt = 0;
 418
 419         if (wolinfo->wolopts & WAKE_PHY)
 420                 opt |= AX_MONITOR_LINK;
 421         if (wolinfo->wolopts & WAKE_MAGIC)
 422                 opt |= AX_MONITOR_MAGIC;
 423
 424         if (asix_write_cmd(dev, AX_CMD_WRITE_MONITOR_MODE,
 425                               opt, 0, 0, NULL) < 0)
 426                 return -EINVAL;
 427
 428         return 0;
 429 }
 430
 431 int asix_get_eeprom_len(struct net_device *net)
 432 {
 433         return AX_EEPROM_LEN;
 434 }
 435
 436 int asix_get_eeprom(struct net_device *net, struct ethtool_eeprom *eeprom,
 437                     u8 *data)
 438 {
 439         struct usbnet *dev = netdev_priv(net);
 440         u16 *eeprom_buff;
 441         int first_word, last_word;
 442         int i;
 443
 444         if (eeprom->len == 0)
 445                 return -EINVAL;
 446
 447         eeprom->magic = AX_EEPROM_MAGIC;
 448
 449         first_word = eeprom->offset >> 1;
 450         last_word = (eeprom->offset + eeprom->len - 1) >> 1;
 451
 452         eeprom_buff = kmalloc(sizeof(u16) * (last_word - first_word + 1),
 453                               GFP_KERNEL);
 454         if (!eeprom_buff)
 455                 return -ENOMEM;
 456
 457         /* ax8817x returns 2 bytes from eeprom on read */
 458         for (i = first_word; i <= last_word; i++) {
 459                 if (asix_read_cmd(dev, AX_CMD_READ_EEPROM, i, 0, 2,
 460                                   &(eeprom_buff[i - first_word])) < 0) {
 461                         kfree(eeprom_buff);
 462                         return -EIO;
 463                 }
 464         }
 465
 466         memcpy(data, (u8 *)eeprom_buff + (eeprom->offset & 1), eeprom->len);
 467         kfree(eeprom_buff);
 468         return 0;
 469 }
 470
 471 int asix_set_eeprom(struct net_device *net, struct ethtool_eeprom *eeprom,
 472                     u8 *data)
 473 {
 474         struct usbnet *dev = netdev_priv(net);
 475         u16 *eeprom_buff;
 476         int first_word, last_word;
 477         int i;
 478         int ret;
 479
 480         netdev_dbg(net, "write EEPROM len %d, offset %d, magic 0x%x\n",
 481                    eeprom->len, eeprom->offset, eeprom->magic);
 482
 483         if (eeprom->len == 0)
 484                 return -EINVAL;
 485
 486         if (eeprom->magic != AX_EEPROM_MAGIC)
 487                 return -EINVAL;
 488
 489         first_word = eeprom->offset >> 1;
 490         last_word = (eeprom->offset + eeprom->len - 1) >> 1;
 491
 492         eeprom_buff = kmalloc(sizeof(u16) * (last_word - first_word + 1),
 493                               GFP_KERNEL);
 494         if (!eeprom_buff)
 495                 return -ENOMEM;
 496
 497         /* align data to 16 bit boundaries, read the missing data from
 498            the EEPROM */
 499         if (eeprom->offset & 1) {
 500                 ret = asix_read_cmd(dev, AX_CMD_READ_EEPROM, first_word, 0, 2,
 501                                     &(eeprom_buff[0]));
 502                 if (ret < 0) {
 503                         netdev_err(net, "Failed to read EEPROM at offset 0x%02x.\n", first_word);
 504                         goto free;
 505                 }
 506         }
 507
 508         if ((eeprom->offset + eeprom->len) & 1) {
 509                 ret = asix_read_cmd(dev, AX_CMD_READ_EEPROM, last_word, 0, 2,
 510                                     &(eeprom_buff[last_word - first_word]));
 511                 if (ret < 0) {
 512                         netdev_err(net, "Failed to read EEPROM at offset 0x%02x.\n", last_word);
 513                         goto free;
 514                 }
 515         }
 516
 517         memcpy((u8 *)eeprom_buff + (eeprom->offset & 1), data, eeprom->len);
 518
 519         /* write data to EEPROM */
 520         ret = asix_write_cmd(dev, AX_CMD_WRITE_ENABLE, 0x0000, 0, 0, NULL);
 521         if (ret < 0) {
 522                 netdev_err(net, "Failed to enable EEPROM write\n");
 523                 goto free;
 524         }
 525         msleep(20);
 526
 527         for (i = first_word; i <= last_word; i++) {
 528                 netdev_dbg(net, "write to EEPROM at offset 0x%02x, data 0x%04x\n",
 529                            i, eeprom_buff[i - first_word]);
 530                 ret = asix_write_cmd(dev, AX_CMD_WRITE_EEPROM, i,
 531                                      eeprom_buff[i - first_word], 0, NULL);
 532                 if (ret < 0) {
 533                         netdev_err(net, "Failed to write EEPROM at offset 0x%02x.\n",
 534                                    i);
 535                         goto free;
 536                 }
 537                 msleep(20);
 538         }
 539
 540         ret = asix_write_cmd(dev, AX_CMD_WRITE_DISABLE, 0x0000, 0, 0, NULL);
 541         if (ret < 0) {
 542                 netdev_err(net, "Failed to disable EEPROM write\n");
 543                 goto free;
 544         }
 545
 546         ret = 0;
 547 free:
 548         kfree(eeprom_buff);
 549         return ret;
 550 }
 551
 552 void asix_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
 553 {
 554         /* Inherit standard device info */
 555         usbnet_get_drvinfo(net, info);
 556         strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
 557         strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
 558         info->eedump_len = AX_EEPROM_LEN;
 559 }
 560
 561 int asix_set_mac_address(struct net_device *net, void *p)
 562 {
 563         struct usbnet *dev = netdev_priv(net);
 564         struct asix_data *data = (struct asix_data *)&dev->data;
 565         struct sockaddr *addr = p;
 566
 567         if (netif_running(net))
 568                 return -EBUSY;
 569         if (!is_valid_ether_addr(addr->sa_data))
 570                 return -EADDRNOTAVAIL;
 571
 572         memcpy(net->dev_addr, addr->sa_data, ETH_ALEN);
 573
 574         /* We use the 20 byte dev->data
 575          * for our 6 byte mac buffer
 576          * to avoid allocating memory that
 577          * is tricky to free later */
 578         memcpy(data->mac_addr, addr->sa_data, ETH_ALEN);
 579         asix_write_cmd_async(dev, AX_CMD_WRITE_NODE_ID, 0, 0, ETH_ALEN,
 580                                                         data->mac_addr);
 581
 582         return 0;
 583 }