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         return skb;
 192 }
 193
 194 int asix_set_sw_mii(struct usbnet *dev)
 195 {
 196         int ret;
 197         ret = asix_write_cmd(dev, AX_CMD_SET_SW_MII, 0x0000, 0, 0, NULL);
 198         if (ret < 0)
 199                 netdev_err(dev->net, "Failed to enable software MII access\n");
 200         return ret;
 201 }
 202
 203 int asix_set_hw_mii(struct usbnet *dev)
 204 {
 205         int ret;
 206         ret = asix_write_cmd(dev, AX_CMD_SET_HW_MII, 0x0000, 0, 0, NULL);
 207         if (ret < 0)
 208                 netdev_err(dev->net, "Failed to enable hardware MII access\n");
 209         return ret;
 210 }
 211
 212 int asix_read_phy_addr(struct usbnet *dev, int internal)
 213 {
 214         int offset = (internal ? 1 : 0);
 215         u8 buf[2];
 216         int ret = asix_read_cmd(dev, AX_CMD_READ_PHY_ID, 0, 0, 2, buf);
 217
 218         netdev_dbg(dev->net, "asix_get_phy_addr()\n");
 219
 220         if (ret < 0) {
 221                 netdev_err(dev->net, "Error reading PHYID register: %02x\n", ret);
 222                 goto out;
 223         }
 224         netdev_dbg(dev->net, "asix_get_phy_addr() returning 0x%04x\n",
 225                    *((__le16 *)buf));
 226         ret = buf[offset];
 227
 228 out:
 229         return ret;
 230 }
 231
 232 int asix_get_phy_addr(struct usbnet *dev)
 233 {
 234         /* return the address of the internal phy */
 235         return asix_read_phy_addr(dev, 1);
 236 }
 237
 238
 239 int asix_sw_reset(struct usbnet *dev, u8 flags)
 240 {
 241         int ret;
 242
 243         ret = asix_write_cmd(dev, AX_CMD_SW_RESET, flags, 0, 0, NULL);
 244         if (ret < 0)
 245                 netdev_err(dev->net, "Failed to send software reset: %02x\n", ret);
 246
 247         return ret;
 248 }
 249
 250 u16 asix_read_rx_ctl(struct usbnet *dev)
 251 {
 252         __le16 v;
 253         int ret = asix_read_cmd(dev, AX_CMD_READ_RX_CTL, 0, 0, 2, &v);
 254
 255         if (ret < 0) {
 256                 netdev_err(dev->net, "Error reading RX_CTL register: %02x\n", ret);
 257                 goto out;
 258         }
 259         ret = le16_to_cpu(v);
 260 out:
 261         return ret;
 262 }
 263
 264 int asix_write_rx_ctl(struct usbnet *dev, u16 mode)
 265 {
 266         int ret;
 267
 268         netdev_dbg(dev->net, "asix_write_rx_ctl() - mode = 0x%04x\n", mode);
 269         ret = asix_write_cmd(dev, AX_CMD_WRITE_RX_CTL, mode, 0, 0, NULL);
 270         if (ret < 0)
 271                 netdev_err(dev->net, "Failed to write RX_CTL mode to 0x%04x: %02x\n",
 272                            mode, ret);
 273
 274         return ret;
 275 }
 276
 277 u16 asix_read_medium_status(struct usbnet *dev)
 278 {
 279         __le16 v;
 280         int ret = asix_read_cmd(dev, AX_CMD_READ_MEDIUM_STATUS, 0, 0, 2, &v);
 281
 282         if (ret < 0) {
 283                 netdev_err(dev->net, "Error reading Medium Status register: %02x\n",
 284                            ret);
 285                 return ret;     /* TODO: callers not checking for error ret */
 286         }
 287
 288         return le16_to_cpu(v);
 289
 290 }
 291
 292 int asix_write_medium_mode(struct usbnet *dev, u16 mode)
 293 {
 294         int ret;
 295
 296         netdev_dbg(dev->net, "asix_write_medium_mode() - mode = 0x%04x\n", mode);
 297         ret = asix_write_cmd(dev, AX_CMD_WRITE_MEDIUM_MODE, mode, 0, 0, NULL);
 298         if (ret < 0)
 299                 netdev_err(dev->net, "Failed to write Medium Mode mode to 0x%04x: %02x\n",
 300                            mode, ret);
 301
 302         return ret;
 303 }
 304
 305 int asix_write_gpio(struct usbnet *dev, u16 value, int sleep)
 306 {
 307         int ret;
 308
 309         netdev_dbg(dev->net, "asix_write_gpio() - value = 0x%04x\n", value);
 310         ret = asix_write_cmd(dev, AX_CMD_WRITE_GPIOS, value, 0, 0, NULL);
 311         if (ret < 0)
 312                 netdev_err(dev->net, "Failed to write GPIO value 0x%04x: %02x\n",
 313                            value, ret);
 314
 315         if (sleep)
 316                 msleep(sleep);
 317
 318         return ret;
 319 }
 320
 321 /*
 322  * AX88772 & AX88178 have a 16-bit RX_CTL value
 323  */
 324 void asix_set_multicast(struct net_device *net)
 325 {
 326         struct usbnet *dev = netdev_priv(net);
 327         struct asix_data *data = (struct asix_data *)&dev->data;
 328         u16 rx_ctl = AX_DEFAULT_RX_CTL;
 329
 330         if (net->flags & IFF_PROMISC) {
 331                 rx_ctl |= AX_RX_CTL_PRO;
 332         } else if (net->flags & IFF_ALLMULTI ||
 333                    netdev_mc_count(net) > AX_MAX_MCAST) {
 334                 rx_ctl |= AX_RX_CTL_AMALL;
 335         } else if (netdev_mc_empty(net)) {
 336                 /* just broadcast and directed */
 337         } else {
 338                 /* We use the 20 byte dev->data
 339                  * for our 8 byte filter buffer
 340                  * to avoid allocating memory that
 341                  * is tricky to free later */
 342                 struct netdev_hw_addr *ha;
 343                 u32 crc_bits;
 344
 345                 memset(data->multi_filter, 0, AX_MCAST_FILTER_SIZE);
 346
 347                 /* Build the multicast hash filter. */
 348                 netdev_for_each_mc_addr(ha, net) {
 349                         crc_bits = ether_crc(ETH_ALEN, ha->addr) >> 26;
 350                         data->multi_filter[crc_bits >> 3] |=
 351                             1 << (crc_bits & 7);
 352                 }
 353
 354                 asix_write_cmd_async(dev, AX_CMD_WRITE_MULTI_FILTER, 0, 0,
 355                                    AX_MCAST_FILTER_SIZE, data->multi_filter);
 356
 357                 rx_ctl |= AX_RX_CTL_AM;
 358         }
 359
 360         asix_write_cmd_async(dev, AX_CMD_WRITE_RX_CTL, rx_ctl, 0, 0, NULL);
 361 }
 362
 363 int asix_mdio_read(struct net_device *netdev, int phy_id, int loc)
 364 {
 365         struct usbnet *dev = netdev_priv(netdev);
 366         __le16 res;
 367
 368         mutex_lock(&dev->phy_mutex);
 369         asix_set_sw_mii(dev);
 370         asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
 371                                 (__u16)loc, 2, &res);
 372         asix_set_hw_mii(dev);
 373         mutex_unlock(&dev->phy_mutex);
 374
 375         netdev_dbg(dev->net, "asix_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n",
 376                    phy_id, loc, le16_to_cpu(res));
 377
 378         return le16_to_cpu(res);
 379 }
 380
 381 void asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val)
 382 {
 383         struct usbnet *dev = netdev_priv(netdev);
 384         __le16 res = cpu_to_le16(val);
 385
 386         netdev_dbg(dev->net, "asix_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
 387                    phy_id, loc, val);
 388         mutex_lock(&dev->phy_mutex);
 389         asix_set_sw_mii(dev);
 390         asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id, (__u16)loc, 2, &res);
 391         asix_set_hw_mii(dev);
 392         mutex_unlock(&dev->phy_mutex);
 393 }
 394
 395 void asix_get_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
 396 {
 397         struct usbnet *dev = netdev_priv(net);
 398         u8 opt;
 399
 400         if (asix_read_cmd(dev, AX_CMD_READ_MONITOR_MODE, 0, 0, 1, &opt) < 0) {
 401                 wolinfo->supported = 0;
 402                 wolinfo->wolopts = 0;
 403                 return;
 404         }
 405         wolinfo->supported = WAKE_PHY | WAKE_MAGIC;
 406         wolinfo->wolopts = 0;
 407         if (opt & AX_MONITOR_LINK)
 408                 wolinfo->wolopts |= WAKE_PHY;
 409         if (opt & AX_MONITOR_MAGIC)
 410                 wolinfo->wolopts |= WAKE_MAGIC;
 411 }
 412
 413 int asix_set_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
 414 {
 415         struct usbnet *dev = netdev_priv(net);
 416         u8 opt = 0;
 417
 418         if (wolinfo->wolopts & WAKE_PHY)
 419                 opt |= AX_MONITOR_LINK;
 420         if (wolinfo->wolopts & WAKE_MAGIC)
 421                 opt |= AX_MONITOR_MAGIC;
 422
 423         if (asix_write_cmd(dev, AX_CMD_WRITE_MONITOR_MODE,
 424                               opt, 0, 0, NULL) < 0)
 425                 return -EINVAL;
 426
 427         return 0;
 428 }
 429
 430 int asix_get_eeprom_len(struct net_device *net)
 431 {
 432         return AX_EEPROM_LEN;
 433 }
 434
 435 int asix_get_eeprom(struct net_device *net, struct ethtool_eeprom *eeprom,
 436                     u8 *data)
 437 {
 438         struct usbnet *dev = netdev_priv(net);
 439         u16 *eeprom_buff;
 440         int first_word, last_word;
 441         int i;
 442
 443         if (eeprom->len == 0)
 444                 return -EINVAL;
 445
 446         eeprom->magic = AX_EEPROM_MAGIC;
 447
 448         first_word = eeprom->offset >> 1;
 449         last_word = (eeprom->offset + eeprom->len - 1) >> 1;
 450
 451         eeprom_buff = kmalloc(sizeof(u16) * (last_word - first_word + 1),
 452                               GFP_KERNEL);
 453         if (!eeprom_buff)
 454                 return -ENOMEM;
 455
 456         /* ax8817x returns 2 bytes from eeprom on read */
 457         for (i = first_word; i <= last_word; i++) {
 458                 if (asix_read_cmd(dev, AX_CMD_READ_EEPROM, i, 0, 2,
 459                                   &(eeprom_buff[i - first_word])) < 0) {
 460                         kfree(eeprom_buff);
 461                         return -EIO;
 462                 }
 463         }
 464
 465         memcpy(data, (u8 *)eeprom_buff + (eeprom->offset & 1), eeprom->len);
 466         kfree(eeprom_buff);
 467         return 0;
 468 }
 469
 470 int asix_set_eeprom(struct net_device *net, struct ethtool_eeprom *eeprom,
 471                     u8 *data)
 472 {
 473         struct usbnet *dev = netdev_priv(net);
 474         u16 *eeprom_buff;
 475         int first_word, last_word;
 476         int i;
 477         int ret;
 478
 479         netdev_dbg(net, "write EEPROM len %d, offset %d, magic 0x%x\n",
 480                    eeprom->len, eeprom->offset, eeprom->magic);
 481
 482         if (eeprom->len == 0)
 483                 return -EINVAL;
 484
 485         if (eeprom->magic != AX_EEPROM_MAGIC)
 486                 return -EINVAL;
 487
 488         first_word = eeprom->offset >> 1;
 489         last_word = (eeprom->offset + eeprom->len - 1) >> 1;
 490
 491         eeprom_buff = kmalloc(sizeof(u16) * (last_word - first_word + 1),
 492                               GFP_KERNEL);
 493         if (!eeprom_buff)
 494                 return -ENOMEM;
 495
 496         /* align data to 16 bit boundaries, read the missing data from
 497            the EEPROM */
 498         if (eeprom->offset & 1) {
 499                 ret = asix_read_cmd(dev, AX_CMD_READ_EEPROM, first_word, 0, 2,
 500                                     &(eeprom_buff[0]));
 501                 if (ret < 0) {
 502                         netdev_err(net, "Failed to read EEPROM at offset 0x%02x.\n", first_word);
 503                         goto free;
 504                 }
 505         }
 506
 507         if ((eeprom->offset + eeprom->len) & 1) {
 508                 ret = asix_read_cmd(dev, AX_CMD_READ_EEPROM, last_word, 0, 2,
 509                                     &(eeprom_buff[last_word - first_word]));
 510                 if (ret < 0) {
 511                         netdev_err(net, "Failed to read EEPROM at offset 0x%02x.\n", last_word);
 512                         goto free;
 513                 }
 514         }
 515
 516         memcpy((u8 *)eeprom_buff + (eeprom->offset & 1), data, eeprom->len);
 517
 518         /* write data to EEPROM */
 519         ret = asix_write_cmd(dev, AX_CMD_WRITE_ENABLE, 0x0000, 0, 0, NULL);
 520         if (ret < 0) {
 521                 netdev_err(net, "Failed to enable EEPROM write\n");
 522                 goto free;
 523         }
 524         msleep(20);
 525
 526         for (i = first_word; i <= last_word; i++) {
 527                 netdev_dbg(net, "write to EEPROM at offset 0x%02x, data 0x%04x\n",
 528                            i, eeprom_buff[i - first_word]);
 529                 ret = asix_write_cmd(dev, AX_CMD_WRITE_EEPROM, i,
 530                                      eeprom_buff[i - first_word], 0, NULL);
 531                 if (ret < 0) {
 532                         netdev_err(net, "Failed to write EEPROM at offset 0x%02x.\n",
 533                                    i);
 534                         goto free;
 535                 }
 536                 msleep(20);
 537         }
 538
 539         ret = asix_write_cmd(dev, AX_CMD_WRITE_DISABLE, 0x0000, 0, 0, NULL);
 540         if (ret < 0) {
 541                 netdev_err(net, "Failed to disable EEPROM write\n");
 542                 goto free;
 543         }
 544
 545         ret = 0;
 546 free:
 547         kfree(eeprom_buff);
 548         return ret;
 549 }
 550
 551 void asix_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
 552 {
 553         /* Inherit standard device info */
 554         usbnet_get_drvinfo(net, info);
 555         strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
 556         strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
 557         info->eedump_len = AX_EEPROM_LEN;
 558 }
 559
 560 int asix_set_mac_address(struct net_device *net, void *p)
 561 {
 562         struct usbnet *dev = netdev_priv(net);
 563         struct asix_data *data = (struct asix_data *)&dev->data;
 564         struct sockaddr *addr = p;
 565
 566         if (netif_running(net))
 567                 return -EBUSY;
 568         if (!is_valid_ether_addr(addr->sa_data))
 569                 return -EADDRNOTAVAIL;
 570
 571         memcpy(net->dev_addr, addr->sa_data, ETH_ALEN);
 572
 573         /* We use the 20 byte dev->data
 574          * for our 6 byte mac buffer
 575          * to avoid allocating memory that
 576          * is tricky to free later */
 577         memcpy(data->mac_addr, addr->sa_data, ETH_ALEN);
 578         asix_write_cmd_async(dev, AX_CMD_WRITE_NODE_ID, 0, 0, ETH_ALEN,
 579                                                         data->mac_addr);
 580
 581         return 0;
 582 }