drivers/net/fec_mpc52xx.c

   1 /*
   2  * Driver for the MPC5200 Fast Ethernet Controller
   3  *
   4  * Originally written by Dale Farnsworth <dfarnsworth@mvista.com> and
   5  * now maintained by Sylvain Munaut <tnt@246tNt.com>
   6  *
   7  * Copyright (C) 2007  Domen Puncer, Telargo, Inc.
   8  * Copyright (C) 2007  Sylvain Munaut <tnt@246tNt.com>
   9  * Copyright (C) 2003-2004  MontaVista, Software, Inc.
  10  *
  11  * This file is licensed under the terms of the GNU General Public License
  12  * version 2. This program is licensed "as is" without any warranty of any
  13  * kind, whether express or implied.
  14  *
  15  */
  16
  17 #include <linux/module.h>
  18
  19 #include <linux/kernel.h>
  20 #include <linux/types.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/errno.h>
  23 #include <linux/init.h>
  24 #include <linux/crc32.h>
  25 #include <linux/hardirq.h>
  26 #include <linux/delay.h>
  27 #include <linux/of_device.h>
  28 #include <linux/of_platform.h>
  29
  30 #include <linux/netdevice.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/ethtool.h>
  33 #include <linux/skbuff.h>
  34
  35 #include <asm/io.h>
  36 #include <asm/delay.h>
  37 #include <asm/mpc52xx.h>
  38
  39 #include <sysdev/bestcomm/bestcomm.h>
  40 #include <sysdev/bestcomm/fec.h>
  41
  42 #include "fec_mpc52xx.h"
  43
  44 #define DRIVER_NAME "mpc52xx-fec"
  45
  46 #define FEC5200_PHYADDR_NONE    (-1)
  47 #define FEC5200_PHYADDR_7WIRE   (-2)
  48
  49 /* Private driver data structure */
  50 struct mpc52xx_fec_priv {
  51         int duplex;
  52         int speed;
  53         int r_irq;
  54         int t_irq;
  55         struct mpc52xx_fec __iomem *fec;
  56         struct bcom_task *rx_dmatsk;
  57         struct bcom_task *tx_dmatsk;
  58         spinlock_t lock;
  59         int msg_enable;
  60
  61         /* MDIO link details */
  62         int phy_addr;
  63         unsigned int phy_speed;
  64         struct phy_device *phydev;
  65         enum phy_state link;
  66 };
  67
  68
  69 static irqreturn_t mpc52xx_fec_interrupt(int, void *);
  70 static irqreturn_t mpc52xx_fec_rx_interrupt(int, void *);
  71 static irqreturn_t mpc52xx_fec_tx_interrupt(int, void *);
  72 static void mpc52xx_fec_stop(struct net_device *dev);
  73 static void mpc52xx_fec_start(struct net_device *dev);
  74 static void mpc52xx_fec_reset(struct net_device *dev);
  75
  76 static u8 mpc52xx_fec_mac_addr[6];
  77 module_param_array_named(mac, mpc52xx_fec_mac_addr, byte, NULL, 0);
  78 MODULE_PARM_DESC(mac, "six hex digits, ie. 0x1,0x2,0xc0,0x01,0xba,0xbe");
  79
  80 #define MPC52xx_MESSAGES_DEFAULT ( NETIF_MSG_DRV | NETIF_MSG_PROBE | \
  81                 NETIF_MSG_LINK | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP)
  82 static int debug = -1;  /* the above default */
  83 module_param(debug, int, 0);
  84 MODULE_PARM_DESC(debug, "debugging messages level");
  85
  86 static void mpc52xx_fec_tx_timeout(struct net_device *dev)
  87 {
  88         dev_warn(&dev->dev, "transmit timed out\n");
  89
  90         mpc52xx_fec_reset(dev);
  91
  92         dev->stats.tx_errors++;
  93
  94         netif_wake_queue(dev);
  95 }
  96
  97 static void mpc52xx_fec_set_paddr(struct net_device *dev, u8 *mac)
  98 {
  99         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 100         struct mpc52xx_fec __iomem *fec = priv->fec;
 101
 102         out_be32(&fec->paddr1, *(u32 *)(&mac[0]));
 103         out_be32(&fec->paddr2, (*(u16 *)(&mac[4]) << 16) | FEC_PADDR2_TYPE);
 104 }
 105
 106 static void mpc52xx_fec_get_paddr(struct net_device *dev, u8 *mac)
 107 {
 108         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 109         struct mpc52xx_fec __iomem *fec = priv->fec;
 110
 111         *(u32 *)(&mac[0]) = in_be32(&fec->paddr1);
 112         *(u16 *)(&mac[4]) = in_be32(&fec->paddr2) >> 16;
 113 }
 114
 115 static int mpc52xx_fec_set_mac_address(struct net_device *dev, void *addr)
 116 {
 117         struct sockaddr *sock = addr;
 118
 119         memcpy(dev->dev_addr, sock->sa_data, dev->addr_len);
 120
 121         mpc52xx_fec_set_paddr(dev, sock->sa_data);
 122         return 0;
 123 }
 124
 125 static void mpc52xx_fec_free_rx_buffers(struct net_device *dev, struct bcom_task *s)
 126 {
 127         while (!bcom_queue_empty(s)) {
 128                 struct bcom_fec_bd *bd;
 129                 struct sk_buff *skb;
 130
 131                 skb = bcom_retrieve_buffer(s, NULL, (struct bcom_bd **)&bd);
 132                 dma_unmap_single(&dev->dev, bd->skb_pa, skb->len, DMA_FROM_DEVICE);
 133                 kfree_skb(skb);
 134         }
 135 }
 136
 137 static int mpc52xx_fec_alloc_rx_buffers(struct net_device *dev, struct bcom_task *rxtsk)
 138 {
 139         while (!bcom_queue_full(rxtsk)) {
 140                 struct sk_buff *skb;
 141                 struct bcom_fec_bd *bd;
 142
 143                 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
 144                 if (skb == NULL)
 145                         return -EAGAIN;
 146
 147                 /* zero out the initial receive buffers to aid debugging */
 148                 memset(skb->data, 0, FEC_RX_BUFFER_SIZE);
 149
 150                 bd = (struct bcom_fec_bd *)bcom_prepare_next_buffer(rxtsk);
 151
 152                 bd->status = FEC_RX_BUFFER_SIZE;
 153                 bd->skb_pa = dma_map_single(&dev->dev, skb->data,
 154                                 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
 155
 156                 bcom_submit_next_buffer(rxtsk, skb);
 157         }
 158
 159         return 0;
 160 }
 161
 162 /* based on generic_adjust_link from fs_enet-main.c */
 163 static void mpc52xx_fec_adjust_link(struct net_device *dev)
 164 {
 165         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 166         struct phy_device *phydev = priv->phydev;
 167         int new_state = 0;
 168
 169         if (phydev->link != PHY_DOWN) {
 170                 if (phydev->duplex != priv->duplex) {
 171                         struct mpc52xx_fec __iomem *fec = priv->fec;
 172                         u32 rcntrl;
 173                         u32 tcntrl;
 174
 175                         new_state = 1;
 176                         priv->duplex = phydev->duplex;
 177
 178                         rcntrl = in_be32(&fec->r_cntrl);
 179                         tcntrl = in_be32(&fec->x_cntrl);
 180
 181                         rcntrl &= ~FEC_RCNTRL_DRT;
 182                         tcntrl &= ~FEC_TCNTRL_FDEN;
 183                         if (phydev->duplex == DUPLEX_FULL)
 184                                 tcntrl |= FEC_TCNTRL_FDEN;      /* FD enable */
 185                         else
 186                                 rcntrl |= FEC_RCNTRL_DRT;       /* disable Rx on Tx (HD) */
 187
 188                         out_be32(&fec->r_cntrl, rcntrl);
 189                         out_be32(&fec->x_cntrl, tcntrl);
 190                 }
 191
 192                 if (phydev->speed != priv->speed) {
 193                         new_state = 1;
 194                         priv->speed = phydev->speed;
 195                 }
 196
 197                 if (priv->link == PHY_DOWN) {
 198                         new_state = 1;
 199                         priv->link = phydev->link;
 200                 }
 201
 202         } else if (priv->link) {
 203                 new_state = 1;
 204                 priv->link = PHY_DOWN;
 205                 priv->speed = 0;
 206                 priv->duplex = -1;
 207         }
 208
 209         if (new_state && netif_msg_link(priv))
 210                 phy_print_status(phydev);
 211 }
 212
 213 static int mpc52xx_fec_init_phy(struct net_device *dev)
 214 {
 215         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 216         struct phy_device *phydev;
 217         char phy_id[BUS_ID_SIZE];
 218
 219         snprintf(phy_id, sizeof(phy_id), "%x:%02x",
 220                         (unsigned int)dev->base_addr, priv->phy_addr);
 221
 222         priv->link = PHY_DOWN;
 223         priv->speed = 0;
 224         priv->duplex = -1;
 225
 226         phydev = phy_connect(dev, phy_id, &mpc52xx_fec_adjust_link, 0, PHY_INTERFACE_MODE_MII);
 227         if (IS_ERR(phydev)) {
 228                 dev_err(&dev->dev, "phy_connect failed\n");
 229                 return PTR_ERR(phydev);
 230         }
 231         dev_info(&dev->dev, "attached phy %i to driver %s\n",
 232                         phydev->addr, phydev->drv->name);
 233
 234         priv->phydev = phydev;
 235
 236         return 0;
 237 }
 238
 239 static int mpc52xx_fec_phy_start(struct net_device *dev)
 240 {
 241         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 242         int err;
 243
 244         if (priv->phy_addr < 0)
 245                 return 0;
 246
 247         err = mpc52xx_fec_init_phy(dev);
 248         if (err) {
 249                 dev_err(&dev->dev, "mpc52xx_fec_init_phy failed\n");
 250                 return err;
 251         }
 252
 253         /* reset phy - this also wakes it from PDOWN */
 254         phy_write(priv->phydev, MII_BMCR, BMCR_RESET);
 255         phy_start(priv->phydev);
 256
 257         return 0;
 258 }
 259
 260 static void mpc52xx_fec_phy_stop(struct net_device *dev)
 261 {
 262         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 263
 264         if (!priv->phydev)
 265                 return;
 266
 267         phy_disconnect(priv->phydev);
 268         /* power down phy */
 269         phy_stop(priv->phydev);
 270         phy_write(priv->phydev, MII_BMCR, BMCR_PDOWN);
 271 }
 272
 273 static int mpc52xx_fec_phy_mii_ioctl(struct mpc52xx_fec_priv *priv,
 274                 struct mii_ioctl_data *mii_data, int cmd)
 275 {
 276         if (!priv->phydev)
 277                 return -ENOTSUPP;
 278
 279         return phy_mii_ioctl(priv->phydev, mii_data, cmd);
 280 }
 281
 282 static void mpc52xx_fec_phy_hw_init(struct mpc52xx_fec_priv *priv)
 283 {
 284         struct mpc52xx_fec __iomem *fec = priv->fec;
 285
 286         if (priv->phydev)
 287                 return;
 288
 289         out_be32(&fec->mii_speed, priv->phy_speed);
 290 }
 291
 292 static int mpc52xx_fec_open(struct net_device *dev)
 293 {
 294         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 295         int err = -EBUSY;
 296
 297         if (request_irq(dev->irq, &mpc52xx_fec_interrupt, IRQF_SHARED,
 298                         DRIVER_NAME "_ctrl", dev)) {
 299                 dev_err(&dev->dev, "ctrl interrupt request failed\n");
 300                 goto out;
 301         }
 302         if (request_irq(priv->r_irq, &mpc52xx_fec_rx_interrupt, 0,
 303                         DRIVER_NAME "_rx", dev)) {
 304                 dev_err(&dev->dev, "rx interrupt request failed\n");
 305                 goto free_ctrl_irq;
 306         }
 307         if (request_irq(priv->t_irq, &mpc52xx_fec_tx_interrupt, 0,
 308                         DRIVER_NAME "_tx", dev)) {
 309                 dev_err(&dev->dev, "tx interrupt request failed\n");
 310                 goto free_2irqs;
 311         }
 312
 313         bcom_fec_rx_reset(priv->rx_dmatsk);
 314         bcom_fec_tx_reset(priv->tx_dmatsk);
 315
 316         err = mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
 317         if (err) {
 318                 dev_err(&dev->dev, "mpc52xx_fec_alloc_rx_buffers failed\n");
 319                 goto free_irqs;
 320         }
 321
 322         err = mpc52xx_fec_phy_start(dev);
 323         if (err)
 324                 goto free_skbs;
 325
 326         bcom_enable(priv->rx_dmatsk);
 327         bcom_enable(priv->tx_dmatsk);
 328
 329         mpc52xx_fec_start(dev);
 330
 331         netif_start_queue(dev);
 332
 333         return 0;
 334
 335  free_skbs:
 336         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
 337
 338  free_irqs:
 339         free_irq(priv->t_irq, dev);
 340  free_2irqs:
 341         free_irq(priv->r_irq, dev);
 342  free_ctrl_irq:
 343         free_irq(dev->irq, dev);
 344  out:
 345
 346         return err;
 347 }
 348
 349 static int mpc52xx_fec_close(struct net_device *dev)
 350 {
 351         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 352
 353         netif_stop_queue(dev);
 354
 355         mpc52xx_fec_stop(dev);
 356
 357         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
 358
 359         free_irq(dev->irq, dev);
 360         free_irq(priv->r_irq, dev);
 361         free_irq(priv->t_irq, dev);
 362
 363         mpc52xx_fec_phy_stop(dev);
 364
 365         return 0;
 366 }
 367
 368 /* This will only be invoked if your driver is _not_ in XOFF state.
 369  * What this means is that you need not check it, and that this
 370  * invariant will hold if you make sure that the netif_*_queue()
 371  * calls are done at the proper times.
 372  */
 373 static int mpc52xx_fec_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 374 {
 375         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 376         struct bcom_fec_bd *bd;
 377
 378         if (bcom_queue_full(priv->tx_dmatsk)) {
 379                 if (net_ratelimit())
 380                         dev_err(&dev->dev, "transmit queue overrun\n");
 381                 return 1;
 382         }
 383
 384         spin_lock_irq(&priv->lock);
 385         dev->trans_start = jiffies;
 386
 387         bd = (struct bcom_fec_bd *)
 388                 bcom_prepare_next_buffer(priv->tx_dmatsk);
 389
 390         bd->status = skb->len | BCOM_FEC_TX_BD_TFD | BCOM_FEC_TX_BD_TC;
 391         bd->skb_pa = dma_map_single(&dev->dev, skb->data, skb->len, DMA_TO_DEVICE);
 392
 393         bcom_submit_next_buffer(priv->tx_dmatsk, skb);
 394
 395         if (bcom_queue_full(priv->tx_dmatsk)) {
 396                 netif_stop_queue(dev);
 397         }
 398
 399         spin_unlock_irq(&priv->lock);
 400
 401         return 0;
 402 }
 403
 404 #ifdef CONFIG_NET_POLL_CONTROLLER
 405 static void mpc52xx_fec_poll_controller(struct net_device *dev)
 406 {
 407         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 408
 409         disable_irq(priv->t_irq);
 410         mpc52xx_fec_tx_interrupt(priv->t_irq, dev);
 411         enable_irq(priv->t_irq);
 412         disable_irq(priv->r_irq);
 413         mpc52xx_fec_rx_interrupt(priv->r_irq, dev);
 414         enable_irq(priv->r_irq);
 415 }
 416 #endif
 417
 418
 419 /* This handles BestComm transmit task interrupts
 420  */
 421 static irqreturn_t mpc52xx_fec_tx_interrupt(int irq, void *dev_id)
 422 {
 423         struct net_device *dev = dev_id;
 424         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 425
 426         spin_lock(&priv->lock);
 427
 428         while (bcom_buffer_done(priv->tx_dmatsk)) {
 429                 struct sk_buff *skb;
 430                 struct bcom_fec_bd *bd;
 431                 skb = bcom_retrieve_buffer(priv->tx_dmatsk, NULL,
 432                                 (struct bcom_bd **)&bd);
 433                 dma_unmap_single(&dev->dev, bd->skb_pa, skb->len, DMA_TO_DEVICE);
 434
 435                 dev_kfree_skb_irq(skb);
 436         }
 437
 438         netif_wake_queue(dev);
 439
 440         spin_unlock(&priv->lock);
 441
 442         return IRQ_HANDLED;
 443 }
 444
 445 static irqreturn_t mpc52xx_fec_rx_interrupt(int irq, void *dev_id)
 446 {
 447         struct net_device *dev = dev_id;
 448         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 449
 450         while (bcom_buffer_done(priv->rx_dmatsk)) {
 451                 struct sk_buff *skb;
 452                 struct sk_buff *rskb;
 453                 struct bcom_fec_bd *bd;
 454                 u32 status;
 455
 456                 rskb = bcom_retrieve_buffer(priv->rx_dmatsk, &status,
 457                                 (struct bcom_bd **)&bd);
 458                 dma_unmap_single(&dev->dev, bd->skb_pa, rskb->len, DMA_FROM_DEVICE);
 459
 460                 /* Test for errors in received frame */
 461                 if (status & BCOM_FEC_RX_BD_ERRORS) {
 462                         /* Drop packet and reuse the buffer */
 463                         bd = (struct bcom_fec_bd *)
 464                                 bcom_prepare_next_buffer(priv->rx_dmatsk);
 465
 466                         bd->status = FEC_RX_BUFFER_SIZE;
 467                         bd->skb_pa = dma_map_single(&dev->dev, rskb->data,
 468                                         FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
 469
 470                         bcom_submit_next_buffer(priv->rx_dmatsk, rskb);
 471
 472                         dev->stats.rx_dropped++;
 473
 474                         continue;
 475                 }
 476
 477                 /* skbs are allocated on open, so now we allocate a new one,
 478                  * and remove the old (with the packet) */
 479                 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
 480                 if (skb) {
 481                         /* Process the received skb */
 482                         int length = status & BCOM_FEC_RX_BD_LEN_MASK;
 483
 484                         skb_put(rskb, length - 4);      /* length without CRC32 */
 485
 486                         rskb->dev = dev;
 487                         rskb->protocol = eth_type_trans(rskb, dev);
 488
 489                         netif_rx(rskb);
 490                 } else {
 491                         /* Can't get a new one : reuse the same & drop pkt */
 492                         dev_notice(&dev->dev, "Memory squeeze, dropping packet.\n");
 493                         dev->stats.rx_dropped++;
 494
 495                         skb = rskb;
 496                 }
 497
 498                 bd = (struct bcom_fec_bd *)
 499                         bcom_prepare_next_buffer(priv->rx_dmatsk);
 500
 501                 bd->status = FEC_RX_BUFFER_SIZE;
 502                 bd->skb_pa = dma_map_single(&dev->dev, skb->data,
 503                                 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
 504
 505                 bcom_submit_next_buffer(priv->rx_dmatsk, skb);
 506         }
 507
 508         return IRQ_HANDLED;
 509 }
 510
 511 static irqreturn_t mpc52xx_fec_interrupt(int irq, void *dev_id)
 512 {
 513         struct net_device *dev = dev_id;
 514         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 515         struct mpc52xx_fec __iomem *fec = priv->fec;
 516         u32 ievent;
 517
 518         ievent = in_be32(&fec->ievent);
 519
 520         ievent &= ~FEC_IEVENT_MII;      /* mii is handled separately */
 521         if (!ievent)
 522                 return IRQ_NONE;
 523
 524         out_be32(&fec->ievent, ievent);         /* clear pending events */
 525
 526         /* on fifo error, soft-reset fec */
 527         if (ievent & (FEC_IEVENT_RFIFO_ERROR | FEC_IEVENT_XFIFO_ERROR)) {
 528
 529                 if (net_ratelimit() && (ievent & FEC_IEVENT_RFIFO_ERROR))
 530                         dev_warn(&dev->dev, "FEC_IEVENT_RFIFO_ERROR\n");
 531                 if (net_ratelimit() && (ievent & FEC_IEVENT_XFIFO_ERROR))
 532                         dev_warn(&dev->dev, "FEC_IEVENT_XFIFO_ERROR\n");
 533
 534                 mpc52xx_fec_reset(dev);
 535
 536                 netif_wake_queue(dev);
 537                 return IRQ_HANDLED;
 538         }
 539
 540         if (ievent & ~FEC_IEVENT_TFINT)
 541                 dev_dbg(&dev->dev, "ievent: %08x\n", ievent);
 542
 543         return IRQ_HANDLED;
 544 }
 545
 546 /*
 547  * Get the current statistics.
 548  * This may be called with the card open or closed.
 549  */
 550 static struct net_device_stats *mpc52xx_fec_get_stats(struct net_device *dev)
 551 {
 552         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 553         struct net_device_stats *stats = &dev->stats;
 554         struct mpc52xx_fec __iomem *fec = priv->fec;
 555
 556         stats->rx_bytes = in_be32(&fec->rmon_r_octets);
 557         stats->rx_packets = in_be32(&fec->rmon_r_packets);
 558         stats->rx_errors = in_be32(&fec->rmon_r_crc_align) +
 559                 in_be32(&fec->rmon_r_undersize) +
 560                 in_be32(&fec->rmon_r_oversize) +
 561                 in_be32(&fec->rmon_r_frag) +
 562                 in_be32(&fec->rmon_r_jab);
 563
 564         stats->tx_bytes = in_be32(&fec->rmon_t_octets);
 565         stats->tx_packets = in_be32(&fec->rmon_t_packets);
 566         stats->tx_errors = in_be32(&fec->rmon_t_crc_align) +
 567                 in_be32(&fec->rmon_t_undersize) +
 568                 in_be32(&fec->rmon_t_oversize) +
 569                 in_be32(&fec->rmon_t_frag) +
 570                 in_be32(&fec->rmon_t_jab);
 571
 572         stats->multicast = in_be32(&fec->rmon_r_mc_pkt);
 573         stats->collisions = in_be32(&fec->rmon_t_col);
 574
 575         /* detailed rx_errors: */
 576         stats->rx_length_errors = in_be32(&fec->rmon_r_undersize)
 577                                         + in_be32(&fec->rmon_r_oversize)
 578                                         + in_be32(&fec->rmon_r_frag)
 579                                         + in_be32(&fec->rmon_r_jab);
 580         stats->rx_over_errors = in_be32(&fec->r_macerr);
 581         stats->rx_crc_errors = in_be32(&fec->ieee_r_crc);
 582         stats->rx_frame_errors = in_be32(&fec->ieee_r_align);
 583         stats->rx_fifo_errors = in_be32(&fec->rmon_r_drop);
 584         stats->rx_missed_errors = in_be32(&fec->rmon_r_drop);
 585
 586         /* detailed tx_errors: */
 587         stats->tx_aborted_errors = 0;
 588         stats->tx_carrier_errors = in_be32(&fec->ieee_t_cserr);
 589         stats->tx_fifo_errors = in_be32(&fec->rmon_t_drop);
 590         stats->tx_heartbeat_errors = in_be32(&fec->ieee_t_sqe);
 591         stats->tx_window_errors = in_be32(&fec->ieee_t_lcol);
 592
 593         return stats;
 594 }
 595
 596 /*
 597  * Read MIB counters in order to reset them,
 598  * then zero all the stats fields in memory
 599  */
 600 static void mpc52xx_fec_reset_stats(struct net_device *dev)
 601 {
 602         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 603         struct mpc52xx_fec __iomem *fec = priv->fec;
 604
 605         out_be32(&fec->mib_control, FEC_MIB_DISABLE);
 606         memset_io(&fec->rmon_t_drop, 0,
 607                    offsetof(struct mpc52xx_fec, reserved10) -
 608                    offsetof(struct mpc52xx_fec, rmon_t_drop));
 609         out_be32(&fec->mib_control, 0);
 610
 611         memset(&dev->stats, 0, sizeof(dev->stats));
 612 }
 613
 614 /*
 615  * Set or clear the multicast filter for this adaptor.
 616  */
 617 static void mpc52xx_fec_set_multicast_list(struct net_device *dev)
 618 {
 619         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 620         struct mpc52xx_fec __iomem *fec = priv->fec;
 621         u32 rx_control;
 622
 623         rx_control = in_be32(&fec->r_cntrl);
 624
 625         if (dev->flags & IFF_PROMISC) {
 626                 rx_control |= FEC_RCNTRL_PROM;
 627                 out_be32(&fec->r_cntrl, rx_control);
 628         } else {
 629                 rx_control &= ~FEC_RCNTRL_PROM;
 630                 out_be32(&fec->r_cntrl, rx_control);
 631
 632                 if (dev->flags & IFF_ALLMULTI) {
 633                         out_be32(&fec->gaddr1, 0xffffffff);
 634                         out_be32(&fec->gaddr2, 0xffffffff);
 635                 } else {
 636                         u32 crc;
 637                         int i;
 638                         struct dev_mc_list *dmi;
 639                         u32 gaddr1 = 0x00000000;
 640                         u32 gaddr2 = 0x00000000;
 641
 642                         dmi = dev->mc_list;
 643                         for (i=0; i<dev->mc_count; i++) {
 644                                 crc = ether_crc_le(6, dmi->dmi_addr) >> 26;
 645                                 if (crc >= 32)
 646                                         gaddr1 |= 1 << (crc-32);
 647                                 else
 648                                         gaddr2 |= 1 << crc;
 649                                 dmi = dmi->next;
 650                         }
 651                         out_be32(&fec->gaddr1, gaddr1);
 652                         out_be32(&fec->gaddr2, gaddr2);
 653                 }
 654         }
 655 }
 656
 657 /**
 658  * mpc52xx_fec_hw_init
 659  * @dev: network device
 660  *
 661  * Setup various hardware setting, only needed once on start
 662  */
 663 static void mpc52xx_fec_hw_init(struct net_device *dev)
 664 {
 665         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 666         struct mpc52xx_fec __iomem *fec = priv->fec;
 667         int i;
 668
 669         /* Whack a reset.  We should wait for this. */
 670         out_be32(&fec->ecntrl, FEC_ECNTRL_RESET);
 671         for (i = 0; i < FEC_RESET_DELAY; ++i) {
 672                 if ((in_be32(&fec->ecntrl) & FEC_ECNTRL_RESET) == 0)
 673                         break;
 674                 udelay(1);
 675         }
 676         if (i == FEC_RESET_DELAY)
 677                 dev_err(&dev->dev, "FEC Reset timeout!\n");
 678
 679         /* set pause to 0x20 frames */
 680         out_be32(&fec->op_pause, FEC_OP_PAUSE_OPCODE | 0x20);
 681
 682         /* high service request will be deasserted when there's < 7 bytes in fifo
 683          * low service request will be deasserted when there's < 4*7 bytes in fifo
 684          */
 685         out_be32(&fec->rfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
 686         out_be32(&fec->tfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
 687
 688         /* alarm when <= x bytes in FIFO */
 689         out_be32(&fec->rfifo_alarm, 0x0000030c);
 690         out_be32(&fec->tfifo_alarm, 0x00000100);
 691
 692         /* begin transmittion when 256 bytes are in FIFO (or EOF or FIFO full) */
 693         out_be32(&fec->x_wmrk, FEC_FIFO_WMRK_256B);
 694
 695         /* enable crc generation */
 696         out_be32(&fec->xmit_fsm, FEC_XMIT_FSM_APPEND_CRC | FEC_XMIT_FSM_ENABLE_CRC);
 697         out_be32(&fec->iaddr1, 0x00000000);     /* No individual filter */
 698         out_be32(&fec->iaddr2, 0x00000000);     /* No individual filter */
 699
 700         /* set phy speed.
 701          * this can't be done in phy driver, since it needs to be called
 702          * before fec stuff (even on resume) */
 703         mpc52xx_fec_phy_hw_init(priv);
 704 }
 705
 706 /**
 707  * mpc52xx_fec_start
 708  * @dev: network device
 709  *
 710  * This function is called to start or restart the FEC during a link
 711  * change.  This happens on fifo errors or when switching between half
 712  * and full duplex.
 713  */
 714 static void mpc52xx_fec_start(struct net_device *dev)
 715 {
 716         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 717         struct mpc52xx_fec __iomem *fec = priv->fec;
 718         u32 rcntrl;
 719         u32 tcntrl;
 720         u32 tmp;
 721
 722         /* clear sticky error bits */
 723         tmp = FEC_FIFO_STATUS_ERR | FEC_FIFO_STATUS_UF | FEC_FIFO_STATUS_OF;
 724         out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status) & tmp);
 725         out_be32(&fec->tfifo_status, in_be32(&fec->tfifo_status) & tmp);
 726
 727         /* FIFOs will reset on mpc52xx_fec_enable */
 728         out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_ENABLE_IS_RESET);
 729
 730         /* Set station address. */
 731         mpc52xx_fec_set_paddr(dev, dev->dev_addr);
 732
 733         mpc52xx_fec_set_multicast_list(dev);
 734
 735         /* set max frame len, enable flow control, select mii mode */
 736         rcntrl = FEC_RX_BUFFER_SIZE << 16;      /* max frame length */
 737         rcntrl |= FEC_RCNTRL_FCE;
 738
 739         if (priv->phy_addr != FEC5200_PHYADDR_7WIRE)
 740                 rcntrl |= FEC_RCNTRL_MII_MODE;
 741
 742         if (priv->duplex == DUPLEX_FULL)
 743                 tcntrl = FEC_TCNTRL_FDEN;       /* FD enable */
 744         else {
 745                 rcntrl |= FEC_RCNTRL_DRT;       /* disable Rx on Tx (HD) */
 746                 tcntrl = 0;
 747         }
 748         out_be32(&fec->r_cntrl, rcntrl);
 749         out_be32(&fec->x_cntrl, tcntrl);
 750
 751         /* Clear any outstanding interrupt. */
 752         out_be32(&fec->ievent, 0xffffffff);
 753
 754         /* Enable interrupts we wish to service. */
 755         out_be32(&fec->imask, FEC_IMASK_ENABLE);
 756
 757         /* And last, enable the transmit and receive processing. */
 758         out_be32(&fec->ecntrl, FEC_ECNTRL_ETHER_EN);
 759         out_be32(&fec->r_des_active, 0x01000000);
 760 }
 761
 762 /**
 763  * mpc52xx_fec_stop
 764  * @dev: network device
 765  *
 766  * stop all activity on fec and empty dma buffers
 767  */
 768 static void mpc52xx_fec_stop(struct net_device *dev)
 769 {
 770         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 771         struct mpc52xx_fec __iomem *fec = priv->fec;
 772         unsigned long timeout;
 773
 774         /* disable all interrupts */
 775         out_be32(&fec->imask, 0);
 776
 777         /* Disable the rx task. */
 778         bcom_disable(priv->rx_dmatsk);
 779
 780         /* Wait for tx queue to drain, but only if we're in process context */
 781         if (!in_interrupt()) {
 782                 timeout = jiffies + msecs_to_jiffies(2000);
 783                 while (time_before(jiffies, timeout) &&
 784                                 !bcom_queue_empty(priv->tx_dmatsk))
 785                         msleep(100);
 786
 787                 if (time_after_eq(jiffies, timeout))
 788                         dev_err(&dev->dev, "queues didn't drain\n");
 789 #if 1
 790                 if (time_after_eq(jiffies, timeout)) {
 791                         dev_err(&dev->dev, "  tx: index: %i, outdex: %i\n",
 792                                         priv->tx_dmatsk->index,
 793                                         priv->tx_dmatsk->outdex);
 794                         dev_err(&dev->dev, "  rx: index: %i, outdex: %i\n",
 795                                         priv->rx_dmatsk->index,
 796                                         priv->rx_dmatsk->outdex);
 797                 }
 798 #endif
 799         }
 800
 801         bcom_disable(priv->tx_dmatsk);
 802
 803         /* Stop FEC */
 804         out_be32(&fec->ecntrl, in_be32(&fec->ecntrl) & ~FEC_ECNTRL_ETHER_EN);
 805
 806         return;
 807 }
 808
 809 /* reset fec and bestcomm tasks */
 810 static void mpc52xx_fec_reset(struct net_device *dev)
 811 {
 812         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 813         struct mpc52xx_fec __iomem *fec = priv->fec;
 814
 815         mpc52xx_fec_stop(dev);
 816
 817         out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status));
 818         out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_RESET_FIFO);
 819
 820         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
 821
 822         mpc52xx_fec_hw_init(dev);
 823
 824         phy_stop(priv->phydev);
 825         phy_write(priv->phydev, MII_BMCR, BMCR_RESET);
 826         phy_start(priv->phydev);
 827
 828         bcom_fec_rx_reset(priv->rx_dmatsk);
 829         bcom_fec_tx_reset(priv->tx_dmatsk);
 830
 831         mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
 832
 833         bcom_enable(priv->rx_dmatsk);
 834         bcom_enable(priv->tx_dmatsk);
 835
 836         mpc52xx_fec_start(dev);
 837 }
 838
 839
 840 /* ethtool interface */
 841 static void mpc52xx_fec_get_drvinfo(struct net_device *dev,
 842                 struct ethtool_drvinfo *info)
 843 {
 844         strcpy(info->driver, DRIVER_NAME);
 845 }
 846
 847 static int mpc52xx_fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 848 {
 849         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 850         return phy_ethtool_gset(priv->phydev, cmd);
 851 }
 852
 853 static int mpc52xx_fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 854 {
 855         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 856         return phy_ethtool_sset(priv->phydev, cmd);
 857 }
 858
 859 static u32 mpc52xx_fec_get_msglevel(struct net_device *dev)
 860 {
 861         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 862         return priv->msg_enable;
 863 }
 864
 865 static void mpc52xx_fec_set_msglevel(struct net_device *dev, u32 level)
 866 {
 867         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 868         priv->msg_enable = level;
 869 }
 870
 871 static const struct ethtool_ops mpc52xx_fec_ethtool_ops = {
 872         .get_drvinfo = mpc52xx_fec_get_drvinfo,
 873         .get_settings = mpc52xx_fec_get_settings,
 874         .set_settings = mpc52xx_fec_set_settings,
 875         .get_link = ethtool_op_get_link,
 876         .get_msglevel = mpc52xx_fec_get_msglevel,
 877         .set_msglevel = mpc52xx_fec_set_msglevel,
 878 };
 879
 880
 881 static int mpc52xx_fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 882 {
 883         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 884
 885         return mpc52xx_fec_phy_mii_ioctl(priv, if_mii(rq), cmd);
 886 }
 887
 888 /* ======================================================================== */
 889 /* OF Driver                                                                */
 890 /* ======================================================================== */
 891
 892 static int __devinit
 893 mpc52xx_fec_probe(struct of_device *op, const struct of_device_id *match)
 894 {
 895         int rv;
 896         struct net_device *ndev;
 897         struct mpc52xx_fec_priv *priv = NULL;
 898         struct resource mem;
 899         struct device_node *phy_node;
 900         const phandle *phy_handle;
 901         const u32 *prop;
 902         int prop_size;
 903
 904         phys_addr_t rx_fifo;
 905         phys_addr_t tx_fifo;
 906
 907         /* Get the ether ndev & it's private zone */
 908         ndev = alloc_etherdev(sizeof(struct mpc52xx_fec_priv));
 909         if (!ndev)
 910                 return -ENOMEM;
 911
 912         priv = netdev_priv(ndev);
 913
 914         /* Reserve FEC control zone */
 915         rv = of_address_to_resource(op->node, 0, &mem);
 916         if (rv) {
 917                 printk(KERN_ERR DRIVER_NAME ": "
 918                                 "Error while parsing device node resource\n" );
 919                 return rv;
 920         }
 921         if ((mem.end - mem.start + 1) < sizeof(struct mpc52xx_fec)) {
 922                 printk(KERN_ERR DRIVER_NAME
 923                         " - invalid resource size (%lx < %x), check mpc52xx_devices.c\n",
 924                         (unsigned long)(mem.end - mem.start + 1), sizeof(struct mpc52xx_fec));
 925                 return -EINVAL;
 926         }
 927
 928         if (!request_mem_region(mem.start, sizeof(struct mpc52xx_fec), DRIVER_NAME))
 929                 return -EBUSY;
 930
 931         /* Init ether ndev with what we have */
 932         ndev->open              = mpc52xx_fec_open;
 933         ndev->stop              = mpc52xx_fec_close;
 934         ndev->hard_start_xmit   = mpc52xx_fec_hard_start_xmit;
 935         ndev->do_ioctl          = mpc52xx_fec_ioctl;
 936         ndev->ethtool_ops       = &mpc52xx_fec_ethtool_ops;
 937         ndev->get_stats         = mpc52xx_fec_get_stats;
 938         ndev->set_mac_address   = mpc52xx_fec_set_mac_address;
 939         ndev->set_multicast_list = mpc52xx_fec_set_multicast_list;
 940         ndev->tx_timeout        = mpc52xx_fec_tx_timeout;
 941         ndev->watchdog_timeo    = FEC_WATCHDOG_TIMEOUT;
 942         ndev->base_addr         = mem.start;
 943 #ifdef CONFIG_NET_POLL_CONTROLLER
 944         ndev->poll_controller = mpc52xx_fec_poll_controller;
 945 #endif
 946
 947         priv->t_irq = priv->r_irq = ndev->irq = NO_IRQ; /* IRQ are free for now */
 948
 949         spin_lock_init(&priv->lock);
 950
 951         /* ioremap the zones */
 952         priv->fec = ioremap(mem.start, sizeof(struct mpc52xx_fec));
 953
 954         if (!priv->fec) {
 955                 rv = -ENOMEM;
 956                 goto probe_error;
 957         }
 958
 959         /* Bestcomm init */
 960         rx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, rfifo_data);
 961         tx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, tfifo_data);
 962
 963         priv->rx_dmatsk = bcom_fec_rx_init(FEC_RX_NUM_BD, rx_fifo, FEC_RX_BUFFER_SIZE);
 964         priv->tx_dmatsk = bcom_fec_tx_init(FEC_TX_NUM_BD, tx_fifo);
 965
 966         if (!priv->rx_dmatsk || !priv->tx_dmatsk) {
 967                 printk(KERN_ERR DRIVER_NAME ": Can not init SDMA tasks\n" );
 968                 rv = -ENOMEM;
 969                 goto probe_error;
 970         }
 971
 972         /* Get the IRQ we need one by one */
 973                 /* Control */
 974         ndev->irq = irq_of_parse_and_map(op->node, 0);
 975
 976                 /* RX */
 977         priv->r_irq = bcom_get_task_irq(priv->rx_dmatsk);
 978
 979                 /* TX */
 980         priv->t_irq = bcom_get_task_irq(priv->tx_dmatsk);
 981
 982         /* MAC address init */
 983         if (!is_zero_ether_addr(mpc52xx_fec_mac_addr))
 984                 memcpy(ndev->dev_addr, mpc52xx_fec_mac_addr, 6);
 985         else
 986                 mpc52xx_fec_get_paddr(ndev, ndev->dev_addr);
 987
 988         priv->msg_enable = netif_msg_init(debug, MPC52xx_MESSAGES_DEFAULT);
 989
 990         /*
 991          * Link mode configuration
 992          */
 993
 994         /* Start with safe defaults for link connection */
 995         priv->phy_addr = FEC5200_PHYADDR_NONE;
 996         priv->speed = 100;
 997         priv->duplex = DUPLEX_HALF;
 998         priv->phy_speed = ((mpc52xx_find_ipb_freq(op->node) >> 20) / 5) << 1;
 999
1000         /* the 7-wire property means don't use MII mode */
1001         if (of_find_property(op->node, "fsl,7-wire-mode", NULL))
1002                 priv->phy_addr = FEC5200_PHYADDR_7WIRE;
1003
1004         /* The current speed preconfigures the speed of the MII link */
1005         prop = of_get_property(op->node, "current-speed", &prop_size);
1006         if (prop && (prop_size >= sizeof(u32) * 2)) {
1007                 priv->speed = prop[0];
1008                 priv->duplex = prop[1] ? DUPLEX_FULL : DUPLEX_HALF;
1009         }
1010
1011         /* If there is a phy handle, setup link to that phy */
1012         phy_handle = of_get_property(op->node, "phy-handle", &prop_size);
1013         if (phy_handle && (prop_size >= sizeof(phandle))) {
1014                 phy_node = of_find_node_by_phandle(*phy_handle);
1015                 prop = of_get_property(phy_node, "reg", &prop_size);
1016                 if (prop && (prop_size >= sizeof(u32)))
1017                         if ((*prop >= 0) && (*prop < PHY_MAX_ADDR))
1018                                 priv->phy_addr = *prop;
1019                 of_node_put(phy_node);
1020         }
1021
1022         /* Hardware init */
1023         mpc52xx_fec_hw_init(ndev);
1024
1025         mpc52xx_fec_reset_stats(ndev);
1026
1027         SET_NETDEV_DEV(ndev, &op->dev);
1028
1029         /* Register the new network device */
1030         rv = register_netdev(ndev);
1031         if (rv < 0)
1032                 goto probe_error;
1033
1034         /* Now report the link setup */
1035         switch (priv->phy_addr) {
1036          case FEC5200_PHYADDR_NONE:
1037                 dev_info(&ndev->dev, "Fixed speed MII link: %i%cD\n",
1038                          priv->speed, priv->duplex ? 'F' : 'H');
1039                 break;
1040          case FEC5200_PHYADDR_7WIRE:
1041                 dev_info(&ndev->dev, "using 7-wire PHY mode\n");
1042                 break;
1043          default:
1044                 dev_info(&ndev->dev, "Using PHY at MDIO address %i\n",
1045                          priv->phy_addr);
1046         }
1047
1048         /* We're done ! */
1049         dev_set_drvdata(&op->dev, ndev);
1050
1051         return 0;
1052
1053
1054         /* Error handling - free everything that might be allocated */
1055 probe_error:
1056
1057         irq_dispose_mapping(ndev->irq);
1058
1059         if (priv->rx_dmatsk)
1060                 bcom_fec_rx_release(priv->rx_dmatsk);
1061         if (priv->tx_dmatsk)
1062                 bcom_fec_tx_release(priv->tx_dmatsk);
1063
1064         if (priv->fec)
1065                 iounmap(priv->fec);
1066
1067         release_mem_region(mem.start, sizeof(struct mpc52xx_fec));
1068
1069         free_netdev(ndev);
1070
1071         return rv;
1072 }
1073
1074 static int
1075 mpc52xx_fec_remove(struct of_device *op)
1076 {
1077         struct net_device *ndev;
1078         struct mpc52xx_fec_priv *priv;
1079
1080         ndev = dev_get_drvdata(&op->dev);
1081         priv = netdev_priv(ndev);
1082
1083         unregister_netdev(ndev);
1084
1085         irq_dispose_mapping(ndev->irq);
1086
1087         bcom_fec_rx_release(priv->rx_dmatsk);
1088         bcom_fec_tx_release(priv->tx_dmatsk);
1089
1090         iounmap(priv->fec);
1091
1092         release_mem_region(ndev->base_addr, sizeof(struct mpc52xx_fec));
1093
1094         free_netdev(ndev);
1095
1096         dev_set_drvdata(&op->dev, NULL);
1097         return 0;
1098 }
1099
1100 #ifdef CONFIG_PM
1101 static int mpc52xx_fec_of_suspend(struct of_device *op, pm_message_t state)
1102 {
1103         struct net_device *dev = dev_get_drvdata(&op->dev);
1104
1105         if (netif_running(dev))
1106                 mpc52xx_fec_close(dev);
1107
1108         return 0;
1109 }
1110
1111 static int mpc52xx_fec_of_resume(struct of_device *op)
1112 {
1113         struct net_device *dev = dev_get_drvdata(&op->dev);
1114
1115         mpc52xx_fec_hw_init(dev);
1116         mpc52xx_fec_reset_stats(dev);
1117
1118         if (netif_running(dev))
1119                 mpc52xx_fec_open(dev);
1120
1121         return 0;
1122 }
1123 #endif
1124
1125 static struct of_device_id mpc52xx_fec_match[] = {
1126         { .type = "network", .compatible = "fsl,mpc5200b-fec", },
1127         { .type = "network", .compatible = "fsl,mpc5200-fec", },
1128         { .type = "network", .compatible = "mpc5200-fec", },
1129         { }
1130 };
1131
1132 MODULE_DEVICE_TABLE(of, mpc52xx_fec_match);
1133
1134 static struct of_platform_driver mpc52xx_fec_driver = {
1135         .owner          = THIS_MODULE,
1136         .name           = DRIVER_NAME,
1137         .match_table    = mpc52xx_fec_match,
1138         .probe          = mpc52xx_fec_probe,
1139         .remove         = mpc52xx_fec_remove,
1140 #ifdef CONFIG_PM
1141         .suspend        = mpc52xx_fec_of_suspend,
1142         .resume         = mpc52xx_fec_of_resume,
1143 #endif
1144 };
1145
1146
1147 /* ======================================================================== */
1148 /* Module                                                                   */
1149 /* ======================================================================== */
1150
1151 static int __init
1152 mpc52xx_fec_init(void)
1153 {
1154 #ifdef CONFIG_FEC_MPC52xx_MDIO
1155         int ret;
1156         ret = of_register_platform_driver(&mpc52xx_fec_mdio_driver);
1157         if (ret) {
1158                 printk(KERN_ERR DRIVER_NAME ": failed to register mdio driver\n");
1159                 return ret;
1160         }
1161 #endif
1162         return of_register_platform_driver(&mpc52xx_fec_driver);
1163 }
1164
1165 static void __exit
1166 mpc52xx_fec_exit(void)
1167 {
1168         of_unregister_platform_driver(&mpc52xx_fec_driver);
1169 #ifdef CONFIG_FEC_MPC52xx_MDIO
1170         of_unregister_platform_driver(&mpc52xx_fec_mdio_driver);
1171 #endif
1172 }
1173
1174
1175 module_init(mpc52xx_fec_init);
1176 module_exit(mpc52xx_fec_exit);
1177
1178 MODULE_LICENSE("GPL");
1179 MODULE_AUTHOR("Dale Farnsworth");
1180 MODULE_DESCRIPTION("Ethernet driver for the Freescale MPC52xx FEC");