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