drivers/net/usb/mcs7830.c

   1 /*
   2  * MosChips MCS7830 based USB 2.0 Ethernet Devices
   3  *
   4  * based on usbnet.c, asix.c and the vendor provided mcs7830 driver
   5  *
   6  * Copyright (C) 2006 Arnd Bergmann <arnd@arndb.de>
   7  * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
   8  * Copyright (C) 2005 Phil Chang <pchang23@sbcglobal.net>
   9  * Copyright (c) 2002-2003 TiVo Inc.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24  */
  25
  26 #include <linux/crc32.h>
  27 #include <linux/etherdevice.h>
  28 #include <linux/ethtool.h>
  29 #include <linux/init.h>
  30 #include <linux/mii.h>
  31 #include <linux/module.h>
  32 #include <linux/netdevice.h>
  33 #include <linux/usb.h>
  34 #include <linux/usb/usbnet.h>
  35
  36 /* requests */
  37 #define MCS7830_RD_BMREQ        (USB_DIR_IN  | USB_TYPE_VENDOR | \
  38                                  USB_RECIP_DEVICE)
  39 #define MCS7830_WR_BMREQ        (USB_DIR_OUT | USB_TYPE_VENDOR | \
  40                                  USB_RECIP_DEVICE)
  41 #define MCS7830_RD_BREQ         0x0E
  42 #define MCS7830_WR_BREQ         0x0D
  43
  44 #define MCS7830_CTRL_TIMEOUT    1000
  45 #define MCS7830_MAX_MCAST       64
  46
  47 #define MCS7830_VENDOR_ID       0x9710
  48 #define MCS7830_PRODUCT_ID      0x7830
  49 #define MCS7730_PRODUCT_ID      0x7730
  50
  51 #define SITECOM_VENDOR_ID       0x0DF6
  52 #define LN_030_PRODUCT_ID       0x0021
  53
  54 #define MCS7830_MII_ADVERTISE   (ADVERTISE_PAUSE_CAP | ADVERTISE_100FULL | \
  55                                  ADVERTISE_100HALF | ADVERTISE_10FULL | \
  56                                  ADVERTISE_10HALF | ADVERTISE_CSMA)
  57
  58 /* HIF_REG_XX coressponding index value */
  59 enum {
  60         HIF_REG_MULTICAST_HASH                  = 0x00,
  61         HIF_REG_PACKET_GAP1                     = 0x08,
  62         HIF_REG_PACKET_GAP2                     = 0x09,
  63         HIF_REG_PHY_DATA                        = 0x0a,
  64         HIF_REG_PHY_CMD1                        = 0x0c,
  65            HIF_REG_PHY_CMD1_READ                = 0x40,
  66            HIF_REG_PHY_CMD1_WRITE               = 0x20,
  67            HIF_REG_PHY_CMD1_PHYADDR             = 0x01,
  68         HIF_REG_PHY_CMD2                        = 0x0d,
  69            HIF_REG_PHY_CMD2_PEND_FLAG_BIT       = 0x80,
  70            HIF_REG_PHY_CMD2_READY_FLAG_BIT      = 0x40,
  71         HIF_REG_CONFIG                          = 0x0e,
  72            HIF_REG_CONFIG_CFG                   = 0x80,
  73            HIF_REG_CONFIG_SPEED100              = 0x40,
  74            HIF_REG_CONFIG_FULLDUPLEX_ENABLE     = 0x20,
  75            HIF_REG_CONFIG_RXENABLE              = 0x10,
  76            HIF_REG_CONFIG_TXENABLE              = 0x08,
  77            HIF_REG_CONFIG_SLEEPMODE             = 0x04,
  78            HIF_REG_CONFIG_ALLMULTICAST          = 0x02,
  79            HIF_REG_CONFIG_PROMISCIOUS           = 0x01,
  80         HIF_REG_ETHERNET_ADDR                   = 0x0f,
  81         HIF_REG_22                              = 0x15,
  82         HIF_REG_PAUSE_THRESHOLD                 = 0x16,
  83            HIF_REG_PAUSE_THRESHOLD_DEFAULT      = 0,
  84 };
  85
  86 struct mcs7830_data {
  87         u8 multi_filter[8];
  88         u8 config;
  89 };
  90
  91 static const char driver_name[] = "MOSCHIP usb-ethernet driver";
  92
  93 static int mcs7830_get_reg(struct usbnet *dev, u16 index, u16 size, void *data)
  94 {
  95         struct usb_device *xdev = dev->udev;
  96         int ret;
  97
  98         ret = usb_control_msg(xdev, usb_rcvctrlpipe(xdev, 0), MCS7830_RD_BREQ,
  99                               MCS7830_RD_BMREQ, 0x0000, index, data,
 100                               size, MCS7830_CTRL_TIMEOUT);
 101         return ret;
 102 }
 103
 104 static int mcs7830_set_reg(struct usbnet *dev, u16 index, u16 size, void *data)
 105 {
 106         struct usb_device *xdev = dev->udev;
 107         int ret;
 108
 109         ret = usb_control_msg(xdev, usb_sndctrlpipe(xdev, 0), MCS7830_WR_BREQ,
 110                               MCS7830_WR_BMREQ, 0x0000, index, data,
 111                               size, MCS7830_CTRL_TIMEOUT);
 112         return ret;
 113 }
 114
 115 static void mcs7830_async_cmd_callback(struct urb *urb)
 116 {
 117         struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
 118
 119         if (urb->status < 0)
 120                 printk(KERN_DEBUG "%s() failed with %d\n",
 121                        __FUNCTION__, urb->status);
 122
 123         kfree(req);
 124         usb_free_urb(urb);
 125 }
 126
 127 static void mcs7830_set_reg_async(struct usbnet *dev, u16 index, u16 size, void *data)
 128 {
 129         struct usb_ctrlrequest *req;
 130         int ret;
 131         struct urb *urb;
 132
 133         urb = usb_alloc_urb(0, GFP_ATOMIC);
 134         if (!urb) {
 135                 dev_dbg(&dev->udev->dev,
 136                         "Error allocating URB in write_cmd_async!\n");
 137                 return;
 138         }
 139
 140         req = kmalloc(sizeof *req, GFP_ATOMIC);
 141         if (!req) {
 142                 dev_err(&dev->udev->dev,
 143                         "Failed to allocate memory for control request\n");
 144                 goto out;
 145         }
 146         req->bRequestType = MCS7830_WR_BMREQ;
 147         req->bRequest = MCS7830_WR_BREQ;
 148         req->wValue = 0;
 149         req->wIndex = cpu_to_le16(index);
 150         req->wLength = cpu_to_le16(size);
 151
 152         usb_fill_control_urb(urb, dev->udev,
 153                              usb_sndctrlpipe(dev->udev, 0),
 154                              (void *)req, data, size,
 155                              mcs7830_async_cmd_callback, req);
 156
 157         ret = usb_submit_urb(urb, GFP_ATOMIC);
 158         if (ret < 0) {
 159                 dev_err(&dev->udev->dev,
 160                         "Error submitting the control message: ret=%d\n", ret);
 161                 goto out;
 162         }
 163         return;
 164 out:
 165         kfree(req);
 166         usb_free_urb(urb);
 167 }
 168
 169 static int mcs7830_get_address(struct usbnet *dev)
 170 {
 171         int ret;
 172         ret = mcs7830_get_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN,
 173                                    dev->net->dev_addr);
 174         if (ret < 0)
 175                 return ret;
 176         return 0;
 177 }
 178
 179 static int mcs7830_read_phy(struct usbnet *dev, u8 index)
 180 {
 181         int ret;
 182         int i;
 183         __le16 val;
 184
 185         u8 cmd[2] = {
 186                 HIF_REG_PHY_CMD1_READ | HIF_REG_PHY_CMD1_PHYADDR,
 187                 HIF_REG_PHY_CMD2_PEND_FLAG_BIT | index,
 188         };
 189
 190         mutex_lock(&dev->phy_mutex);
 191         /* write the MII command */
 192         ret = mcs7830_set_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
 193         if (ret < 0)
 194                 goto out;
 195
 196         /* wait for the data to become valid, should be within < 1ms */
 197         for (i = 0; i < 10; i++) {
 198                 ret = mcs7830_get_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
 199                 if ((ret < 0) || (cmd[1] & HIF_REG_PHY_CMD2_READY_FLAG_BIT))
 200                         break;
 201                 ret = -EIO;
 202                 msleep(1);
 203         }
 204         if (ret < 0)
 205                 goto out;
 206
 207         /* read actual register contents */
 208         ret = mcs7830_get_reg(dev, HIF_REG_PHY_DATA, 2, &val);
 209         if (ret < 0)
 210                 goto out;
 211         ret = le16_to_cpu(val);
 212         dev_dbg(&dev->udev->dev, "read PHY reg %02x: %04x (%d tries)\n",
 213                 index, val, i);
 214 out:
 215         mutex_unlock(&dev->phy_mutex);
 216         return ret;
 217 }
 218
 219 static int mcs7830_write_phy(struct usbnet *dev, u8 index, u16 val)
 220 {
 221         int ret;
 222         int i;
 223         __le16 le_val;
 224
 225         u8 cmd[2] = {
 226                 HIF_REG_PHY_CMD1_WRITE | HIF_REG_PHY_CMD1_PHYADDR,
 227                 HIF_REG_PHY_CMD2_PEND_FLAG_BIT | (index & 0x1F),
 228         };
 229
 230         mutex_lock(&dev->phy_mutex);
 231
 232         /* write the new register contents */
 233         le_val = cpu_to_le16(val);
 234         ret = mcs7830_set_reg(dev, HIF_REG_PHY_DATA, 2, &le_val);
 235         if (ret < 0)
 236                 goto out;
 237
 238         /* write the MII command */
 239         ret = mcs7830_set_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
 240         if (ret < 0)
 241                 goto out;
 242
 243         /* wait for the command to be accepted by the PHY */
 244         for (i = 0; i < 10; i++) {
 245                 ret = mcs7830_get_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
 246                 if ((ret < 0) || (cmd[1] & HIF_REG_PHY_CMD2_READY_FLAG_BIT))
 247                         break;
 248                 ret = -EIO;
 249                 msleep(1);
 250         }
 251         if (ret < 0)
 252                 goto out;
 253
 254         ret = 0;
 255         dev_dbg(&dev->udev->dev, "write PHY reg %02x: %04x (%d tries)\n",
 256                 index, val, i);
 257 out:
 258         mutex_unlock(&dev->phy_mutex);
 259         return ret;
 260 }
 261
 262 /*
 263  * This algorithm comes from the original mcs7830 version 1.4 driver,
 264  * not sure if it is needed.
 265  */
 266 static int mcs7830_set_autoneg(struct usbnet *dev, int ptrUserPhyMode)
 267 {
 268         int ret;
 269         /* Enable all media types */
 270         ret = mcs7830_write_phy(dev, MII_ADVERTISE, MCS7830_MII_ADVERTISE);
 271
 272         /* First reset BMCR */
 273         if (!ret)
 274                 ret = mcs7830_write_phy(dev, MII_BMCR, 0x0000);
 275         /* Enable Auto Neg */
 276         if (!ret)
 277                 ret = mcs7830_write_phy(dev, MII_BMCR, BMCR_ANENABLE);
 278         /* Restart Auto Neg (Keep the Enable Auto Neg Bit Set) */
 279         if (!ret)
 280                 ret = mcs7830_write_phy(dev, MII_BMCR,
 281                                 BMCR_ANENABLE | BMCR_ANRESTART  );
 282         return ret < 0 ? : 0;
 283 }
 284
 285
 286 /*
 287  * if we can read register 22, the chip revision is C or higher
 288  */
 289 static int mcs7830_get_rev(struct usbnet *dev)
 290 {
 291         u8 dummy[2];
 292         int ret;
 293         ret = mcs7830_get_reg(dev, HIF_REG_22, 2, dummy);
 294         if (ret > 0)
 295                 return 2; /* Rev C or later */
 296         return 1; /* earlier revision */
 297 }
 298
 299 /*
 300  * On rev. C we need to set the pause threshold
 301  */
 302 static void mcs7830_rev_C_fixup(struct usbnet *dev)
 303 {
 304         u8 pause_threshold = HIF_REG_PAUSE_THRESHOLD_DEFAULT;
 305         int retry;
 306
 307         for (retry = 0; retry < 2; retry++) {
 308                 if (mcs7830_get_rev(dev) == 2) {
 309                         dev_info(&dev->udev->dev, "applying rev.C fixup\n");
 310                         mcs7830_set_reg(dev, HIF_REG_PAUSE_THRESHOLD,
 311                                         1, &pause_threshold);
 312                 }
 313                 msleep(1);
 314         }
 315 }
 316
 317 static int mcs7830_init_dev(struct usbnet *dev)
 318 {
 319         int ret;
 320         int retry;
 321
 322         /* Read MAC address from EEPROM */
 323         ret = -EINVAL;
 324         for (retry = 0; retry < 5 && ret; retry++)
 325                 ret = mcs7830_get_address(dev);
 326         if (ret) {
 327                 dev_warn(&dev->udev->dev, "Cannot read MAC address\n");
 328                 goto out;
 329         }
 330
 331         /* Set up PHY */
 332         ret = mcs7830_set_autoneg(dev, 0);
 333         if (ret) {
 334                 dev_info(&dev->udev->dev, "Cannot set autoneg\n");
 335                 goto out;
 336         }
 337
 338         mcs7830_rev_C_fixup(dev);
 339         ret = 0;
 340 out:
 341         return ret;
 342 }
 343
 344 static int mcs7830_mdio_read(struct net_device *netdev, int phy_id,
 345                              int location)
 346 {
 347         struct usbnet *dev = netdev->priv;
 348         return mcs7830_read_phy(dev, location);
 349 }
 350
 351 static void mcs7830_mdio_write(struct net_device *netdev, int phy_id,
 352                                 int location, int val)
 353 {
 354         struct usbnet *dev = netdev->priv;
 355         mcs7830_write_phy(dev, location, val);
 356 }
 357
 358 static int mcs7830_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
 359 {
 360         struct usbnet *dev = netdev_priv(net);
 361         return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
 362 }
 363
 364 /* credits go to asix_set_multicast */
 365 static void mcs7830_set_multicast(struct net_device *net)
 366 {
 367         struct usbnet *dev = netdev_priv(net);
 368         struct mcs7830_data *data = (struct mcs7830_data *)&dev->data;
 369
 370         data->config = HIF_REG_CONFIG_TXENABLE;
 371
 372         /* this should not be needed, but it doesn't work otherwise */
 373         data->config |= HIF_REG_CONFIG_ALLMULTICAST;
 374
 375         if (net->flags & IFF_PROMISC) {
 376                 data->config |= HIF_REG_CONFIG_PROMISCIOUS;
 377         } else if (net->flags & IFF_ALLMULTI
 378                    || net->mc_count > MCS7830_MAX_MCAST) {
 379                 data->config |= HIF_REG_CONFIG_ALLMULTICAST;
 380         } else if (net->mc_count == 0) {
 381                 /* just broadcast and directed */
 382         } else {
 383                 /* We use the 20 byte dev->data
 384                  * for our 8 byte filter buffer
 385                  * to avoid allocating memory that
 386                  * is tricky to free later */
 387                 struct dev_mc_list *mc_list = net->mc_list;
 388                 u32 crc_bits;
 389                 int i;
 390
 391                 memset(data->multi_filter, 0, sizeof data->multi_filter);
 392
 393                 /* Build the multicast hash filter. */
 394                 for (i = 0; i < net->mc_count; i++) {
 395                         crc_bits = ether_crc(ETH_ALEN, mc_list->dmi_addr) >> 26;
 396                         data->multi_filter[crc_bits >> 3] |= 1 << (crc_bits & 7);
 397                         mc_list = mc_list->next;
 398                 }
 399
 400                 mcs7830_set_reg_async(dev, HIF_REG_MULTICAST_HASH,
 401                                 sizeof data->multi_filter,
 402                                 data->multi_filter);
 403         }
 404
 405         mcs7830_set_reg_async(dev, HIF_REG_CONFIG, 1, &data->config);
 406 }
 407
 408 static int mcs7830_get_regs_len(struct net_device *net)
 409 {
 410         struct usbnet *dev = netdev_priv(net);
 411
 412         switch (mcs7830_get_rev(dev)) {
 413         case 1:
 414                 return 21;
 415         case 2:
 416                 return 32;
 417         }
 418         return 0;
 419 }
 420
 421 static void mcs7830_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *drvinfo)
 422 {
 423         usbnet_get_drvinfo(net, drvinfo);
 424         drvinfo->regdump_len = mcs7830_get_regs_len(net);
 425 }
 426
 427 static void mcs7830_get_regs(struct net_device *net, struct ethtool_regs *regs, void *data)
 428 {
 429         struct usbnet *dev = netdev_priv(net);
 430
 431         regs->version = mcs7830_get_rev(dev);
 432         mcs7830_get_reg(dev, 0, regs->len, data);
 433 }
 434
 435 static struct ethtool_ops mcs7830_ethtool_ops = {
 436         .get_drvinfo            = mcs7830_get_drvinfo,
 437         .get_regs_len           = mcs7830_get_regs_len,
 438         .get_regs               = mcs7830_get_regs,
 439
 440         /* common usbnet calls */
 441         .get_link               = usbnet_get_link,
 442         .get_msglevel           = usbnet_get_msglevel,
 443         .set_msglevel           = usbnet_set_msglevel,
 444         .get_settings           = usbnet_get_settings,
 445         .set_settings           = usbnet_set_settings,
 446         .nway_reset             = usbnet_nway_reset,
 447 };
 448
 449 static int mcs7830_set_mac_address(struct net_device *netdev, void *p)
 450 {
 451         int ret;
 452         struct usbnet *dev = netdev_priv(netdev);
 453         struct sockaddr *addr = p;
 454
 455         if (netif_running(netdev))
 456                 return -EBUSY;
 457
 458         if (!is_valid_ether_addr(addr->sa_data))
 459                 return -EINVAL;
 460
 461         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
 462
 463         ret = mcs7830_set_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN,
 464                         netdev->dev_addr);
 465
 466         if (ret < 0)
 467                 return ret;
 468
 469         return 0;
 470 }
 471
 472 static int mcs7830_bind(struct usbnet *dev, struct usb_interface *udev)
 473 {
 474         struct net_device *net = dev->net;
 475         int ret;
 476
 477         ret = mcs7830_init_dev(dev);
 478         if (ret)
 479                 goto out;
 480
 481         net->do_ioctl = mcs7830_ioctl;
 482         net->ethtool_ops = &mcs7830_ethtool_ops;
 483         net->set_multicast_list = mcs7830_set_multicast;
 484         mcs7830_set_multicast(net);
 485         net->set_mac_address = mcs7830_set_mac_address;
 486
 487         /* reserve space for the status byte on rx */
 488         dev->rx_urb_size = ETH_FRAME_LEN + 1;
 489
 490         dev->mii.mdio_read = mcs7830_mdio_read;
 491         dev->mii.mdio_write = mcs7830_mdio_write;
 492         dev->mii.dev = net;
 493         dev->mii.phy_id_mask = 0x3f;
 494         dev->mii.reg_num_mask = 0x1f;
 495         dev->mii.phy_id = *((u8 *) net->dev_addr + 1);
 496
 497         ret = usbnet_get_endpoints(dev, udev);
 498 out:
 499         return ret;
 500 }
 501
 502 /* The chip always appends a status bytes that we need to strip */
 503 static int mcs7830_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
 504 {
 505         u8 status;
 506
 507         if (skb->len == 0) {
 508                 dev_err(&dev->udev->dev, "unexpected empty rx frame\n");
 509                 return 0;
 510         }
 511
 512         skb_trim(skb, skb->len - 1);
 513         status = skb->data[skb->len];
 514
 515         if (status != 0x20)
 516                 dev_dbg(&dev->udev->dev, "rx fixup status %x\n", status);
 517
 518         return skb->len > 0;
 519 }
 520
 521 static const struct driver_info moschip_info = {
 522         .description    = "MOSCHIP 7830/7730 usb-NET adapter",
 523         .bind           = mcs7830_bind,
 524         .rx_fixup       = mcs7830_rx_fixup,
 525         .flags          = FLAG_ETHER,
 526         .in             = 1,
 527         .out            = 2,
 528 };
 529
 530 static const struct driver_info sitecom_info = {
 531         .description    = "Sitecom LN-30 usb-NET adapter",
 532         .bind           = mcs7830_bind,
 533         .rx_fixup       = mcs7830_rx_fixup,
 534         .flags          = FLAG_ETHER,
 535         .in             = 1,
 536         .out            = 2,
 537 };
 538
 539 static const struct usb_device_id products[] = {
 540         {
 541                 USB_DEVICE(MCS7830_VENDOR_ID, MCS7830_PRODUCT_ID),
 542                 .driver_info = (unsigned long) &moschip_info,
 543         },
 544         {
 545                 USB_DEVICE(MCS7830_VENDOR_ID, MCS7730_PRODUCT_ID),
 546                 .driver_info = (unsigned long) &moschip_info,
 547         },
 548         {
 549                 USB_DEVICE(SITECOM_VENDOR_ID, LN_030_PRODUCT_ID),
 550                 .driver_info = (unsigned long) &sitecom_info,
 551         },
 552         {},
 553 };
 554 MODULE_DEVICE_TABLE(usb, products);
 555
 556 static struct usb_driver mcs7830_driver = {
 557         .name = driver_name,
 558         .id_table = products,
 559         .probe = usbnet_probe,
 560         .disconnect = usbnet_disconnect,
 561         .suspend = usbnet_suspend,
 562         .resume = usbnet_resume,
 563 };
 564
 565 static int __init mcs7830_init(void)
 566 {
 567         return usb_register(&mcs7830_driver);
 568 }
 569 module_init(mcs7830_init);
 570
 571 static void __exit mcs7830_exit(void)
 572 {
 573         usb_deregister(&mcs7830_driver);
 574 }
 575 module_exit(mcs7830_exit);
 576
 577 MODULE_DESCRIPTION("USB to network adapter MCS7830)");
 578 MODULE_LICENSE("GPL");