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