drivers/net/fs_enet/fs_enet-main.c

   1 /*
   2  * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
   3  *
   4  * Copyright (c) 2003 Intracom S.A.
   5  *  by Pantelis Antoniou <panto@intracom.gr>
   6  *
   7  * 2005 (c) MontaVista Software, Inc.
   8  * Vitaly Bordug <vbordug@ru.mvista.com>
   9  *
  10  * Heavily based on original FEC driver by Dan Malek <dan@embeddededge.com>
  11  * and modifications by Joakim Tjernlund <joakim.tjernlund@lumentis.se>
  12  *
  13  * This file is licensed under the terms of the GNU General Public License
  14  * version 2. This program is licensed "as is" without any warranty of any
  15  * kind, whether express or implied.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/types.h>
  21 #include <linux/string.h>
  22 #include <linux/ptrace.h>
  23 #include <linux/errno.h>
  24 #include <linux/ioport.h>
  25 #include <linux/slab.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/init.h>
  28 #include <linux/delay.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/skbuff.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/mii.h>
  34 #include <linux/ethtool.h>
  35 #include <linux/bitops.h>
  36 #include <linux/fs.h>
  37 #include <linux/platform_device.h>
  38 #include <linux/phy.h>
  39
  40 #include <linux/vmalloc.h>
  41 #include <asm/pgtable.h>
  42 #include <asm/irq.h>
  43 #include <asm/uaccess.h>
  44
  45 #include "fs_enet.h"
  46
  47 /*************************************************/
  48
  49 static char version[] __devinitdata =
  50     DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")" "\n";
  51
  52 MODULE_AUTHOR("Pantelis Antoniou <panto@intracom.gr>");
  53 MODULE_DESCRIPTION("Freescale Ethernet Driver");
  54 MODULE_LICENSE("GPL");
  55 MODULE_VERSION(DRV_MODULE_VERSION);
  56
  57 int fs_enet_debug = -1;         /* -1 == use FS_ENET_DEF_MSG_ENABLE as value */
  58 module_param(fs_enet_debug, int, 0);
  59 MODULE_PARM_DESC(fs_enet_debug,
  60                  "Freescale bitmapped debugging message enable value");
  61
  62
  63 static void fs_set_multicast_list(struct net_device *dev)
  64 {
  65         struct fs_enet_private *fep = netdev_priv(dev);
  66
  67         (*fep->ops->set_multicast_list)(dev);
  68 }
  69
  70 /* NAPI receive function */
  71 static int fs_enet_rx_napi(struct napi_struct *napi, int budget)
  72 {
  73         struct fs_enet_private *fep = container_of(napi, struct fs_enet_private, napi);
  74         struct net_device *dev = to_net_dev(fep->dev);
  75         const struct fs_platform_info *fpi = fep->fpi;
  76         cbd_t *bdp;
  77         struct sk_buff *skb, *skbn, *skbt;
  78         int received = 0;
  79         u16 pkt_len, sc;
  80         int curidx;
  81
  82         if (!netif_running(dev))
  83                 return 0;
  84
  85         /*
  86          * First, grab all of the stats for the incoming packet.
  87          * These get messed up if we get called due to a busy condition.
  88          */
  89         bdp = fep->cur_rx;
  90
  91         /* clear RX status bits for napi*/
  92         (*fep->ops->napi_clear_rx_event)(dev);
  93
  94         while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
  95                 curidx = bdp - fep->rx_bd_base;
  96
  97                 /*
  98                  * Since we have allocated space to hold a complete frame,
  99                  * the last indicator should be set.
 100                  */
 101                 if ((sc & BD_ENET_RX_LAST) == 0)
 102                         printk(KERN_WARNING DRV_MODULE_NAME
 103                                ": %s rcv is not +last\n",
 104                                dev->name);
 105
 106                 /*
 107                  * Check for errors.
 108                  */
 109                 if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
 110                           BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
 111                         fep->stats.rx_errors++;
 112                         /* Frame too long or too short. */
 113                         if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
 114                                 fep->stats.rx_length_errors++;
 115                         /* Frame alignment */
 116                         if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
 117                                 fep->stats.rx_frame_errors++;
 118                         /* CRC Error */
 119                         if (sc & BD_ENET_RX_CR)
 120                                 fep->stats.rx_crc_errors++;
 121                         /* FIFO overrun */
 122                         if (sc & BD_ENET_RX_OV)
 123                                 fep->stats.rx_crc_errors++;
 124
 125                         skb = fep->rx_skbuff[curidx];
 126
 127                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 128                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 129                                 DMA_FROM_DEVICE);
 130
 131                         skbn = skb;
 132
 133                 } else {
 134                         skb = fep->rx_skbuff[curidx];
 135
 136                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 137                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 138                                 DMA_FROM_DEVICE);
 139
 140                         /*
 141                          * Process the incoming frame.
 142                          */
 143                         fep->stats.rx_packets++;
 144                         pkt_len = CBDR_DATLEN(bdp) - 4; /* remove CRC */
 145                         fep->stats.rx_bytes += pkt_len + 4;
 146
 147                         if (pkt_len <= fpi->rx_copybreak) {
 148                                 /* +2 to make IP header L1 cache aligned */
 149                                 skbn = dev_alloc_skb(pkt_len + 2);
 150                                 if (skbn != NULL) {
 151                                         skb_reserve(skbn, 2);   /* align IP header */
 152                                         skb_copy_from_linear_data(skb,
 153                                                       skbn->data, pkt_len);
 154                                         /* swap */
 155                                         skbt = skb;
 156                                         skb = skbn;
 157                                         skbn = skbt;
 158                                 }
 159                         } else
 160                                 skbn = dev_alloc_skb(ENET_RX_FRSIZE);
 161
 162                         if (skbn != NULL) {
 163                                 skb_put(skb, pkt_len);  /* Make room */
 164                                 skb->protocol = eth_type_trans(skb, dev);
 165                                 received++;
 166                                 netif_receive_skb(skb);
 167                         } else {
 168                                 printk(KERN_WARNING DRV_MODULE_NAME
 169                                        ": %s Memory squeeze, dropping packet.\n",
 170                                        dev->name);
 171                                 fep->stats.rx_dropped++;
 172                                 skbn = skb;
 173                         }
 174                 }
 175
 176                 fep->rx_skbuff[curidx] = skbn;
 177                 CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
 178                              L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 179                              DMA_FROM_DEVICE));
 180                 CBDW_DATLEN(bdp, 0);
 181                 CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
 182
 183                 /*
 184                  * Update BD pointer to next entry.
 185                  */
 186                 if ((sc & BD_ENET_RX_WRAP) == 0)
 187                         bdp++;
 188                 else
 189                         bdp = fep->rx_bd_base;
 190
 191                 (*fep->ops->rx_bd_done)(dev);
 192
 193                 if (received >= budget)
 194                         break;
 195         }
 196
 197         fep->cur_rx = bdp;
 198
 199         if (received >= budget) {
 200                 /* done */
 201                 netif_rx_complete(dev, napi);
 202                 (*fep->ops->napi_enable_rx)(dev);
 203         }
 204         return received;
 205 }
 206
 207 /* non NAPI receive function */
 208 static int fs_enet_rx_non_napi(struct net_device *dev)
 209 {
 210         struct fs_enet_private *fep = netdev_priv(dev);
 211         const struct fs_platform_info *fpi = fep->fpi;
 212         cbd_t *bdp;
 213         struct sk_buff *skb, *skbn, *skbt;
 214         int received = 0;
 215         u16 pkt_len, sc;
 216         int curidx;
 217         /*
 218          * First, grab all of the stats for the incoming packet.
 219          * These get messed up if we get called due to a busy condition.
 220          */
 221         bdp = fep->cur_rx;
 222
 223         while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
 224
 225                 curidx = bdp - fep->rx_bd_base;
 226
 227                 /*
 228                  * Since we have allocated space to hold a complete frame,
 229                  * the last indicator should be set.
 230                  */
 231                 if ((sc & BD_ENET_RX_LAST) == 0)
 232                         printk(KERN_WARNING DRV_MODULE_NAME
 233                                ": %s rcv is not +last\n",
 234                                dev->name);
 235
 236                 /*
 237                  * Check for errors.
 238                  */
 239                 if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
 240                           BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
 241                         fep->stats.rx_errors++;
 242                         /* Frame too long or too short. */
 243                         if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
 244                                 fep->stats.rx_length_errors++;
 245                         /* Frame alignment */
 246                         if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
 247                                 fep->stats.rx_frame_errors++;
 248                         /* CRC Error */
 249                         if (sc & BD_ENET_RX_CR)
 250                                 fep->stats.rx_crc_errors++;
 251                         /* FIFO overrun */
 252                         if (sc & BD_ENET_RX_OV)
 253                                 fep->stats.rx_crc_errors++;
 254
 255                         skb = fep->rx_skbuff[curidx];
 256
 257                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 258                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 259                                 DMA_FROM_DEVICE);
 260
 261                         skbn = skb;
 262
 263                 } else {
 264
 265                         skb = fep->rx_skbuff[curidx];
 266
 267                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 268                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 269                                 DMA_FROM_DEVICE);
 270
 271                         /*
 272                          * Process the incoming frame.
 273                          */
 274                         fep->stats.rx_packets++;
 275                         pkt_len = CBDR_DATLEN(bdp) - 4; /* remove CRC */
 276                         fep->stats.rx_bytes += pkt_len + 4;
 277
 278                         if (pkt_len <= fpi->rx_copybreak) {
 279                                 /* +2 to make IP header L1 cache aligned */
 280                                 skbn = dev_alloc_skb(pkt_len + 2);
 281                                 if (skbn != NULL) {
 282                                         skb_reserve(skbn, 2);   /* align IP header */
 283                                         skb_copy_from_linear_data(skb,
 284                                                       skbn->data, pkt_len);
 285                                         /* swap */
 286                                         skbt = skb;
 287                                         skb = skbn;
 288                                         skbn = skbt;
 289                                 }
 290                         } else
 291                                 skbn = dev_alloc_skb(ENET_RX_FRSIZE);
 292
 293                         if (skbn != NULL) {
 294                                 skb_put(skb, pkt_len);  /* Make room */
 295                                 skb->protocol = eth_type_trans(skb, dev);
 296                                 received++;
 297                                 netif_rx(skb);
 298                         } else {
 299                                 printk(KERN_WARNING DRV_MODULE_NAME
 300                                        ": %s Memory squeeze, dropping packet.\n",
 301                                        dev->name);
 302                                 fep->stats.rx_dropped++;
 303                                 skbn = skb;
 304                         }
 305                 }
 306
 307                 fep->rx_skbuff[curidx] = skbn;
 308                 CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
 309                              L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 310                              DMA_FROM_DEVICE));
 311                 CBDW_DATLEN(bdp, 0);
 312                 CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
 313
 314                 /*
 315                  * Update BD pointer to next entry.
 316                  */
 317                 if ((sc & BD_ENET_RX_WRAP) == 0)
 318                         bdp++;
 319                 else
 320                         bdp = fep->rx_bd_base;
 321
 322                 (*fep->ops->rx_bd_done)(dev);
 323         }
 324
 325         fep->cur_rx = bdp;
 326
 327         return 0;
 328 }
 329
 330 static void fs_enet_tx(struct net_device *dev)
 331 {
 332         struct fs_enet_private *fep = netdev_priv(dev);
 333         cbd_t *bdp;
 334         struct sk_buff *skb;
 335         int dirtyidx, do_wake, do_restart;
 336         u16 sc;
 337
 338         spin_lock(&fep->lock);
 339         bdp = fep->dirty_tx;
 340
 341         do_wake = do_restart = 0;
 342         while (((sc = CBDR_SC(bdp)) & BD_ENET_TX_READY) == 0) {
 343
 344                 dirtyidx = bdp - fep->tx_bd_base;
 345
 346                 if (fep->tx_free == fep->tx_ring)
 347                         break;
 348
 349                 skb = fep->tx_skbuff[dirtyidx];
 350
 351                 /*
 352                  * Check for errors.
 353                  */
 354                 if (sc & (BD_ENET_TX_HB | BD_ENET_TX_LC |
 355                           BD_ENET_TX_RL | BD_ENET_TX_UN | BD_ENET_TX_CSL)) {
 356
 357                         if (sc & BD_ENET_TX_HB) /* No heartbeat */
 358                                 fep->stats.tx_heartbeat_errors++;
 359                         if (sc & BD_ENET_TX_LC) /* Late collision */
 360                                 fep->stats.tx_window_errors++;
 361                         if (sc & BD_ENET_TX_RL) /* Retrans limit */
 362                                 fep->stats.tx_aborted_errors++;
 363                         if (sc & BD_ENET_TX_UN) /* Underrun */
 364                                 fep->stats.tx_fifo_errors++;
 365                         if (sc & BD_ENET_TX_CSL)        /* Carrier lost */
 366                                 fep->stats.tx_carrier_errors++;
 367
 368                         if (sc & (BD_ENET_TX_LC | BD_ENET_TX_RL | BD_ENET_TX_UN)) {
 369                                 fep->stats.tx_errors++;
 370                                 do_restart = 1;
 371                         }
 372                 } else
 373                         fep->stats.tx_packets++;
 374
 375                 if (sc & BD_ENET_TX_READY)
 376                         printk(KERN_WARNING DRV_MODULE_NAME
 377                                ": %s HEY! Enet xmit interrupt and TX_READY.\n",
 378                                dev->name);
 379
 380                 /*
 381                  * Deferred means some collisions occurred during transmit,
 382                  * but we eventually sent the packet OK.
 383                  */
 384                 if (sc & BD_ENET_TX_DEF)
 385                         fep->stats.collisions++;
 386
 387                 /* unmap */
 388                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 389                                 skb->len, DMA_TO_DEVICE);
 390
 391                 /*
 392                  * Free the sk buffer associated with this last transmit.
 393                  */
 394                 dev_kfree_skb_irq(skb);
 395                 fep->tx_skbuff[dirtyidx] = NULL;
 396
 397                 /*
 398                  * Update pointer to next buffer descriptor to be transmitted.
 399                  */
 400                 if ((sc & BD_ENET_TX_WRAP) == 0)
 401                         bdp++;
 402                 else
 403                         bdp = fep->tx_bd_base;
 404
 405                 /*
 406                  * Since we have freed up a buffer, the ring is no longer
 407                  * full.
 408                  */
 409                 if (!fep->tx_free++)
 410                         do_wake = 1;
 411         }
 412
 413         fep->dirty_tx = bdp;
 414
 415         if (do_restart)
 416                 (*fep->ops->tx_restart)(dev);
 417
 418         spin_unlock(&fep->lock);
 419
 420         if (do_wake)
 421                 netif_wake_queue(dev);
 422 }
 423
 424 /*
 425  * The interrupt handler.
 426  * This is called from the MPC core interrupt.
 427  */
 428 static irqreturn_t
 429 fs_enet_interrupt(int irq, void *dev_id)
 430 {
 431         struct net_device *dev = dev_id;
 432         struct fs_enet_private *fep;
 433         const struct fs_platform_info *fpi;
 434         u32 int_events;
 435         u32 int_clr_events;
 436         int nr, napi_ok;
 437         int handled;
 438
 439         fep = netdev_priv(dev);
 440         fpi = fep->fpi;
 441
 442         nr = 0;
 443         while ((int_events = (*fep->ops->get_int_events)(dev)) != 0) {
 444
 445                 nr++;
 446
 447                 int_clr_events = int_events;
 448                 if (fpi->use_napi)
 449                         int_clr_events &= ~fep->ev_napi_rx;
 450
 451                 (*fep->ops->clear_int_events)(dev, int_clr_events);
 452
 453                 if (int_events & fep->ev_err)
 454                         (*fep->ops->ev_error)(dev, int_events);
 455
 456                 if (int_events & fep->ev_rx) {
 457                         if (!fpi->use_napi)
 458                                 fs_enet_rx_non_napi(dev);
 459                         else {
 460                                 napi_ok = napi_schedule_prep(&fep->napi);
 461
 462                                 (*fep->ops->napi_disable_rx)(dev);
 463                                 (*fep->ops->clear_int_events)(dev, fep->ev_napi_rx);
 464
 465                                 /* NOTE: it is possible for FCCs in NAPI mode    */
 466                                 /* to submit a spurious interrupt while in poll  */
 467                                 if (napi_ok)
 468                                         __netif_rx_schedule(dev, &fep->napi);
 469                         }
 470                 }
 471
 472                 if (int_events & fep->ev_tx)
 473                         fs_enet_tx(dev);
 474         }
 475
 476         handled = nr > 0;
 477         return IRQ_RETVAL(handled);
 478 }
 479
 480 void fs_init_bds(struct net_device *dev)
 481 {
 482         struct fs_enet_private *fep = netdev_priv(dev);
 483         cbd_t *bdp;
 484         struct sk_buff *skb;
 485         int i;
 486
 487         fs_cleanup_bds(dev);
 488
 489         fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
 490         fep->tx_free = fep->tx_ring;
 491         fep->cur_rx = fep->rx_bd_base;
 492
 493         /*
 494          * Initialize the receive buffer descriptors.
 495          */
 496         for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
 497                 skb = dev_alloc_skb(ENET_RX_FRSIZE);
 498                 if (skb == NULL) {
 499                         printk(KERN_WARNING DRV_MODULE_NAME
 500                                ": %s Memory squeeze, unable to allocate skb\n",
 501                                dev->name);
 502                         break;
 503                 }
 504                 fep->rx_skbuff[i] = skb;
 505                 CBDW_BUFADDR(bdp,
 506                         dma_map_single(fep->dev, skb->data,
 507                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 508                                 DMA_FROM_DEVICE));
 509                 CBDW_DATLEN(bdp, 0);    /* zero */
 510                 CBDW_SC(bdp, BD_ENET_RX_EMPTY |
 511                         ((i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP));
 512         }
 513         /*
 514          * if we failed, fillup remainder
 515          */
 516         for (; i < fep->rx_ring; i++, bdp++) {
 517                 fep->rx_skbuff[i] = NULL;
 518                 CBDW_SC(bdp, (i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP);
 519         }
 520
 521         /*
 522          * ...and the same for transmit.
 523          */
 524         for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
 525                 fep->tx_skbuff[i] = NULL;
 526                 CBDW_BUFADDR(bdp, 0);
 527                 CBDW_DATLEN(bdp, 0);
 528                 CBDW_SC(bdp, (i < fep->tx_ring - 1) ? 0 : BD_SC_WRAP);
 529         }
 530 }
 531
 532 void fs_cleanup_bds(struct net_device *dev)
 533 {
 534         struct fs_enet_private *fep = netdev_priv(dev);
 535         struct sk_buff *skb;
 536         cbd_t *bdp;
 537         int i;
 538
 539         /*
 540          * Reset SKB transmit buffers.
 541          */
 542         for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
 543                 if ((skb = fep->tx_skbuff[i]) == NULL)
 544                         continue;
 545
 546                 /* unmap */
 547                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 548                                 skb->len, DMA_TO_DEVICE);
 549
 550                 fep->tx_skbuff[i] = NULL;
 551                 dev_kfree_skb(skb);
 552         }
 553
 554         /*
 555          * Reset SKB receive buffers
 556          */
 557         for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
 558                 if ((skb = fep->rx_skbuff[i]) == NULL)
 559                         continue;
 560
 561                 /* unmap */
 562                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 563                         L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 564                         DMA_FROM_DEVICE);
 565
 566                 fep->rx_skbuff[i] = NULL;
 567
 568                 dev_kfree_skb(skb);
 569         }
 570 }
 571
 572 /**********************************************************************************/
 573
 574 static int fs_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
 575 {
 576         struct fs_enet_private *fep = netdev_priv(dev);
 577         cbd_t *bdp;
 578         int curidx;
 579         u16 sc;
 580         unsigned long flags;
 581
 582         spin_lock_irqsave(&fep->tx_lock, flags);
 583
 584         /*
 585          * Fill in a Tx ring entry
 586          */
 587         bdp = fep->cur_tx;
 588
 589         if (!fep->tx_free || (CBDR_SC(bdp) & BD_ENET_TX_READY)) {
 590                 netif_stop_queue(dev);
 591                 spin_unlock_irqrestore(&fep->tx_lock, flags);
 592
 593                 /*
 594                  * Ooops.  All transmit buffers are full.  Bail out.
 595                  * This should not happen, since the tx queue should be stopped.
 596                  */
 597                 printk(KERN_WARNING DRV_MODULE_NAME
 598                        ": %s tx queue full!.\n", dev->name);
 599                 return NETDEV_TX_BUSY;
 600         }
 601
 602         curidx = bdp - fep->tx_bd_base;
 603         /*
 604          * Clear all of the status flags.
 605          */
 606         CBDC_SC(bdp, BD_ENET_TX_STATS);
 607
 608         /*
 609          * Save skb pointer.
 610          */
 611         fep->tx_skbuff[curidx] = skb;
 612
 613         fep->stats.tx_bytes += skb->len;
 614
 615         /*
 616          * Push the data cache so the CPM does not get stale memory data.
 617          */
 618         CBDW_BUFADDR(bdp, dma_map_single(fep->dev,
 619                                 skb->data, skb->len, DMA_TO_DEVICE));
 620         CBDW_DATLEN(bdp, skb->len);
 621
 622         dev->trans_start = jiffies;
 623
 624         /*
 625          * If this was the last BD in the ring, start at the beginning again.
 626          */
 627         if ((CBDR_SC(bdp) & BD_ENET_TX_WRAP) == 0)
 628                 fep->cur_tx++;
 629         else
 630                 fep->cur_tx = fep->tx_bd_base;
 631
 632         if (!--fep->tx_free)
 633                 netif_stop_queue(dev);
 634
 635         /* Trigger transmission start */
 636         sc = BD_ENET_TX_READY | BD_ENET_TX_INTR |
 637              BD_ENET_TX_LAST | BD_ENET_TX_TC;
 638
 639         /* note that while FEC does not have this bit
 640          * it marks it as available for software use
 641          * yay for hw reuse :) */
 642         if (skb->len <= 60)
 643                 sc |= BD_ENET_TX_PAD;
 644         CBDS_SC(bdp, sc);
 645
 646         (*fep->ops->tx_kickstart)(dev);
 647
 648         spin_unlock_irqrestore(&fep->tx_lock, flags);
 649
 650         return NETDEV_TX_OK;
 651 }
 652
 653 static int fs_request_irq(struct net_device *dev, int irq, const char *name,
 654                 irq_handler_t irqf)
 655 {
 656         struct fs_enet_private *fep = netdev_priv(dev);
 657
 658         (*fep->ops->pre_request_irq)(dev, irq);
 659         return request_irq(irq, irqf, IRQF_SHARED, name, dev);
 660 }
 661
 662 static void fs_free_irq(struct net_device *dev, int irq)
 663 {
 664         struct fs_enet_private *fep = netdev_priv(dev);
 665
 666         free_irq(irq, dev);
 667         (*fep->ops->post_free_irq)(dev, irq);
 668 }
 669
 670 static void fs_timeout(struct net_device *dev)
 671 {
 672         struct fs_enet_private *fep = netdev_priv(dev);
 673         unsigned long flags;
 674         int wake = 0;
 675
 676         fep->stats.tx_errors++;
 677
 678         spin_lock_irqsave(&fep->lock, flags);
 679
 680         if (dev->flags & IFF_UP) {
 681                 phy_stop(fep->phydev);
 682                 (*fep->ops->stop)(dev);
 683                 (*fep->ops->restart)(dev);
 684                 phy_start(fep->phydev);
 685         }
 686
 687         phy_start(fep->phydev);
 688         wake = fep->tx_free && !(CBDR_SC(fep->cur_tx) & BD_ENET_TX_READY);
 689         spin_unlock_irqrestore(&fep->lock, flags);
 690
 691         if (wake)
 692                 netif_wake_queue(dev);
 693 }
 694
 695 /*-----------------------------------------------------------------------------
 696  *  generic link-change handler - should be sufficient for most cases
 697  *-----------------------------------------------------------------------------*/
 698 static void generic_adjust_link(struct  net_device *dev)
 699 {
 700        struct fs_enet_private *fep = netdev_priv(dev);
 701        struct phy_device *phydev = fep->phydev;
 702        int new_state = 0;
 703
 704        if (phydev->link) {
 705
 706                /* adjust to duplex mode */
 707                if (phydev->duplex != fep->oldduplex){
 708                        new_state = 1;
 709                        fep->oldduplex = phydev->duplex;
 710                }
 711
 712                if (phydev->speed != fep->oldspeed) {
 713                        new_state = 1;
 714                        fep->oldspeed = phydev->speed;
 715                }
 716
 717                if (!fep->oldlink) {
 718                        new_state = 1;
 719                        fep->oldlink = 1;
 720                        netif_schedule(dev);
 721                        netif_carrier_on(dev);
 722                        netif_start_queue(dev);
 723                }
 724
 725                if (new_state)
 726                        fep->ops->restart(dev);
 727
 728        } else if (fep->oldlink) {
 729                new_state = 1;
 730                fep->oldlink = 0;
 731                fep->oldspeed = 0;
 732                fep->oldduplex = -1;
 733                netif_carrier_off(dev);
 734                netif_stop_queue(dev);
 735        }
 736
 737        if (new_state && netif_msg_link(fep))
 738                phy_print_status(phydev);
 739 }
 740
 741
 742 static void fs_adjust_link(struct net_device *dev)
 743 {
 744         struct fs_enet_private *fep = netdev_priv(dev);
 745         unsigned long flags;
 746
 747         spin_lock_irqsave(&fep->lock, flags);
 748
 749         if(fep->ops->adjust_link)
 750                 fep->ops->adjust_link(dev);
 751         else
 752                 generic_adjust_link(dev);
 753
 754         spin_unlock_irqrestore(&fep->lock, flags);
 755 }
 756
 757 static int fs_init_phy(struct net_device *dev)
 758 {
 759         struct fs_enet_private *fep = netdev_priv(dev);
 760         struct phy_device *phydev;
 761
 762         fep->oldlink = 0;
 763         fep->oldspeed = 0;
 764         fep->oldduplex = -1;
 765         if(fep->fpi->bus_id)
 766                 phydev = phy_connect(dev, fep->fpi->bus_id, &fs_adjust_link, 0,
 767                                 PHY_INTERFACE_MODE_MII);
 768         else {
 769                 printk("No phy bus ID specified in BSP code\n");
 770                 return -EINVAL;
 771         }
 772         if (IS_ERR(phydev)) {
 773                 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
 774                 return PTR_ERR(phydev);
 775         }
 776
 777         fep->phydev = phydev;
 778
 779         return 0;
 780 }
 781
 782
 783 static int fs_enet_open(struct net_device *dev)
 784 {
 785         struct fs_enet_private *fep = netdev_priv(dev);
 786         int r;
 787         int err;
 788
 789         napi_enable(&fep->napi);
 790
 791         /* Install our interrupt handler. */
 792         r = fs_request_irq(dev, fep->interrupt, "fs_enet-mac", fs_enet_interrupt);
 793         if (r != 0) {
 794                 printk(KERN_ERR DRV_MODULE_NAME
 795                        ": %s Could not allocate FS_ENET IRQ!", dev->name);
 796                 napi_disable(&fep->napi);
 797                 return -EINVAL;
 798         }
 799
 800         err = fs_init_phy(dev);
 801         if(err) {
 802                 napi_disable(&fep->napi);
 803                 return err;
 804         }
 805         phy_start(fep->phydev);
 806
 807         return 0;
 808 }
 809
 810 static int fs_enet_close(struct net_device *dev)
 811 {
 812         struct fs_enet_private *fep = netdev_priv(dev);
 813         unsigned long flags;
 814
 815         netif_stop_queue(dev);
 816         netif_carrier_off(dev);
 817         napi_disable(&fep->napi);
 818         phy_stop(fep->phydev);
 819
 820         spin_lock_irqsave(&fep->lock, flags);
 821         (*fep->ops->stop)(dev);
 822         spin_unlock_irqrestore(&fep->lock, flags);
 823
 824         /* release any irqs */
 825         phy_disconnect(fep->phydev);
 826         fep->phydev = NULL;
 827         fs_free_irq(dev, fep->interrupt);
 828
 829         return 0;
 830 }
 831
 832 static struct net_device_stats *fs_enet_get_stats(struct net_device *dev)
 833 {
 834         struct fs_enet_private *fep = netdev_priv(dev);
 835         return &fep->stats;
 836 }
 837
 838 /*************************************************************************/
 839
 840 static void fs_get_drvinfo(struct net_device *dev,
 841                             struct ethtool_drvinfo *info)
 842 {
 843         strcpy(info->driver, DRV_MODULE_NAME);
 844         strcpy(info->version, DRV_MODULE_VERSION);
 845 }
 846
 847 static int fs_get_regs_len(struct net_device *dev)
 848 {
 849         struct fs_enet_private *fep = netdev_priv(dev);
 850
 851         return (*fep->ops->get_regs_len)(dev);
 852 }
 853
 854 static void fs_get_regs(struct net_device *dev, struct ethtool_regs *regs,
 855                          void *p)
 856 {
 857         struct fs_enet_private *fep = netdev_priv(dev);
 858         unsigned long flags;
 859         int r, len;
 860
 861         len = regs->len;
 862
 863         spin_lock_irqsave(&fep->lock, flags);
 864         r = (*fep->ops->get_regs)(dev, p, &len);
 865         spin_unlock_irqrestore(&fep->lock, flags);
 866
 867         if (r == 0)
 868                 regs->version = 0;
 869 }
 870
 871 static int fs_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 872 {
 873         struct fs_enet_private *fep = netdev_priv(dev);
 874         return phy_ethtool_gset(fep->phydev, cmd);
 875 }
 876
 877 static int fs_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 878 {
 879         struct fs_enet_private *fep = netdev_priv(dev);
 880         phy_ethtool_sset(fep->phydev, cmd);
 881         return 0;
 882 }
 883
 884 static int fs_nway_reset(struct net_device *dev)
 885 {
 886         return 0;
 887 }
 888
 889 static u32 fs_get_msglevel(struct net_device *dev)
 890 {
 891         struct fs_enet_private *fep = netdev_priv(dev);
 892         return fep->msg_enable;
 893 }
 894
 895 static void fs_set_msglevel(struct net_device *dev, u32 value)
 896 {
 897         struct fs_enet_private *fep = netdev_priv(dev);
 898         fep->msg_enable = value;
 899 }
 900
 901 static const struct ethtool_ops fs_ethtool_ops = {
 902         .get_drvinfo = fs_get_drvinfo,
 903         .get_regs_len = fs_get_regs_len,
 904         .get_settings = fs_get_settings,
 905         .set_settings = fs_set_settings,
 906         .nway_reset = fs_nway_reset,
 907         .get_link = ethtool_op_get_link,
 908         .get_msglevel = fs_get_msglevel,
 909         .set_msglevel = fs_set_msglevel,
 910         .get_tx_csum = ethtool_op_get_tx_csum,
 911         .set_tx_csum = ethtool_op_set_tx_csum,  /* local! */
 912         .get_sg = ethtool_op_get_sg,
 913         .set_sg = ethtool_op_set_sg,
 914         .get_regs = fs_get_regs,
 915 };
 916
 917 static int fs_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 918 {
 919         struct fs_enet_private *fep = netdev_priv(dev);
 920         struct mii_ioctl_data *mii = (struct mii_ioctl_data *)&rq->ifr_data;
 921         unsigned long flags;
 922         int rc;
 923
 924         if (!netif_running(dev))
 925                 return -EINVAL;
 926
 927         spin_lock_irqsave(&fep->lock, flags);
 928         rc = phy_mii_ioctl(fep->phydev, mii, cmd);
 929         spin_unlock_irqrestore(&fep->lock, flags);
 930         return rc;
 931 }
 932
 933 extern int fs_mii_connect(struct net_device *dev);
 934 extern void fs_mii_disconnect(struct net_device *dev);
 935
 936 static struct net_device *fs_init_instance(struct device *dev,
 937                 struct fs_platform_info *fpi)
 938 {
 939         struct net_device *ndev = NULL;
 940         struct fs_enet_private *fep = NULL;
 941         int privsize, i, r, err = 0, registered = 0;
 942
 943         fpi->fs_no = fs_get_id(fpi);
 944         /* guard */
 945         if ((unsigned int)fpi->fs_no >= FS_MAX_INDEX)
 946                 return ERR_PTR(-EINVAL);
 947
 948         privsize = sizeof(*fep) + (sizeof(struct sk_buff **) *
 949                             (fpi->rx_ring + fpi->tx_ring));
 950
 951         ndev = alloc_etherdev(privsize);
 952         if (!ndev) {
 953                 err = -ENOMEM;
 954                 goto err;
 955         }
 956         SET_MODULE_OWNER(ndev);
 957
 958         fep = netdev_priv(ndev);
 959         memset(fep, 0, privsize);       /* clear everything */
 960
 961         fep->dev = dev;
 962         dev_set_drvdata(dev, ndev);
 963         fep->fpi = fpi;
 964         if (fpi->init_ioports)
 965                 fpi->init_ioports((struct fs_platform_info *)fpi);
 966
 967 #ifdef CONFIG_FS_ENET_HAS_FEC
 968         if (fs_get_fec_index(fpi->fs_no) >= 0)
 969                 fep->ops = &fs_fec_ops;
 970 #endif
 971
 972 #ifdef CONFIG_FS_ENET_HAS_SCC
 973         if (fs_get_scc_index(fpi->fs_no) >=0 )
 974                 fep->ops = &fs_scc_ops;
 975 #endif
 976
 977 #ifdef CONFIG_FS_ENET_HAS_FCC
 978         if (fs_get_fcc_index(fpi->fs_no) >= 0)
 979                 fep->ops = &fs_fcc_ops;
 980 #endif
 981
 982         if (fep->ops == NULL) {
 983                 printk(KERN_ERR DRV_MODULE_NAME
 984                        ": %s No matching ops found (%d).\n",
 985                        ndev->name, fpi->fs_no);
 986                 err = -EINVAL;
 987                 goto err;
 988         }
 989
 990         r = (*fep->ops->setup_data)(ndev);
 991         if (r != 0) {
 992                 printk(KERN_ERR DRV_MODULE_NAME
 993                        ": %s setup_data failed\n",
 994                         ndev->name);
 995                 err = r;
 996                 goto err;
 997         }
 998
 999         /* point rx_skbuff, tx_skbuff */
1000         fep->rx_skbuff = (struct sk_buff **)&fep[1];
1001         fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;
1002
1003         /* init locks */
1004         spin_lock_init(&fep->lock);
1005         spin_lock_init(&fep->tx_lock);
1006
1007         /*
1008          * Set the Ethernet address.
1009          */
1010         for (i = 0; i < 6; i++)
1011                 ndev->dev_addr[i] = fpi->macaddr[i];
1012
1013         r = (*fep->ops->allocate_bd)(ndev);
1014
1015         if (fep->ring_base == NULL) {
1016                 printk(KERN_ERR DRV_MODULE_NAME
1017                        ": %s buffer descriptor alloc failed (%d).\n", ndev->name, r);
1018                 err = r;
1019                 goto err;
1020         }
1021
1022         /*
1023          * Set receive and transmit descriptor base.
1024          */
1025         fep->rx_bd_base = fep->ring_base;
1026         fep->tx_bd_base = fep->rx_bd_base + fpi->rx_ring;
1027
1028         /* initialize ring size variables */
1029         fep->tx_ring = fpi->tx_ring;
1030         fep->rx_ring = fpi->rx_ring;
1031
1032         /*
1033          * The FEC Ethernet specific entries in the device structure.
1034          */
1035         ndev->open = fs_enet_open;
1036         ndev->hard_start_xmit = fs_enet_start_xmit;
1037         ndev->tx_timeout = fs_timeout;
1038         ndev->watchdog_timeo = 2 * HZ;
1039         ndev->stop = fs_enet_close;
1040         ndev->get_stats = fs_enet_get_stats;
1041         ndev->set_multicast_list = fs_set_multicast_list;
1042         netif_napi_add(ndev, &fep->napi,
1043                        fs_enet_rx_napi, fpi->napi_weight);
1044
1045         ndev->ethtool_ops = &fs_ethtool_ops;
1046         ndev->do_ioctl = fs_ioctl;
1047
1048         init_timer(&fep->phy_timer_list);
1049
1050         netif_carrier_off(ndev);
1051
1052         err = register_netdev(ndev);
1053         if (err != 0) {
1054                 printk(KERN_ERR DRV_MODULE_NAME
1055                        ": %s register_netdev failed.\n", ndev->name);
1056                 goto err;
1057         }
1058         registered = 1;
1059
1060
1061         return ndev;
1062
1063       err:
1064         if (ndev != NULL) {
1065
1066                 if (registered)
1067                         unregister_netdev(ndev);
1068
1069                 if (fep != NULL) {
1070                         (*fep->ops->free_bd)(ndev);
1071                         (*fep->ops->cleanup_data)(ndev);
1072                 }
1073
1074                 free_netdev(ndev);
1075         }
1076
1077         dev_set_drvdata(dev, NULL);
1078
1079         return ERR_PTR(err);
1080 }
1081
1082 static int fs_cleanup_instance(struct net_device *ndev)
1083 {
1084         struct fs_enet_private *fep;
1085         const struct fs_platform_info *fpi;
1086         struct device *dev;
1087
1088         if (ndev == NULL)
1089                 return -EINVAL;
1090
1091         fep = netdev_priv(ndev);
1092         if (fep == NULL)
1093                 return -EINVAL;
1094
1095         fpi = fep->fpi;
1096
1097         unregister_netdev(ndev);
1098
1099         dma_free_coherent(fep->dev, (fpi->tx_ring + fpi->rx_ring) * sizeof(cbd_t),
1100                           fep->ring_base, fep->ring_mem_addr);
1101
1102         /* reset it */
1103         (*fep->ops->cleanup_data)(ndev);
1104
1105         dev = fep->dev;
1106         if (dev != NULL) {
1107                 dev_set_drvdata(dev, NULL);
1108                 fep->dev = NULL;
1109         }
1110
1111         free_netdev(ndev);
1112
1113         return 0;
1114 }
1115
1116 /**************************************************************************************/
1117
1118 /* handy pointer to the immap */
1119 void *fs_enet_immap = NULL;
1120
1121 static int setup_immap(void)
1122 {
1123         phys_addr_t paddr = 0;
1124         unsigned long size = 0;
1125
1126 #ifdef CONFIG_CPM1
1127         paddr = IMAP_ADDR;
1128         size = 0x10000; /* map 64K */
1129 #endif
1130
1131 #ifdef CONFIG_CPM2
1132         paddr = CPM_MAP_ADDR;
1133         size = 0x40000; /* map 256 K */
1134 #endif
1135         fs_enet_immap = ioremap(paddr, size);
1136         if (fs_enet_immap == NULL)
1137                 return -EBADF;  /* XXX ahem; maybe just BUG_ON? */
1138
1139         return 0;
1140 }
1141
1142 static void cleanup_immap(void)
1143 {
1144         if (fs_enet_immap != NULL) {
1145                 iounmap(fs_enet_immap);
1146                 fs_enet_immap = NULL;
1147         }
1148 }
1149
1150 /**************************************************************************************/
1151
1152 static int __devinit fs_enet_probe(struct device *dev)
1153 {
1154         struct net_device *ndev;
1155
1156         /* no fixup - no device */
1157         if (dev->platform_data == NULL) {
1158                 printk(KERN_INFO "fs_enet: "
1159                                 "probe called with no platform data; "
1160                                 "remove unused devices\n");
1161                 return -ENODEV;
1162         }
1163
1164         ndev = fs_init_instance(dev, dev->platform_data);
1165         if (IS_ERR(ndev))
1166                 return PTR_ERR(ndev);
1167         return 0;
1168 }
1169
1170 static int fs_enet_remove(struct device *dev)
1171 {
1172         return fs_cleanup_instance(dev_get_drvdata(dev));
1173 }
1174
1175 static struct device_driver fs_enet_fec_driver = {
1176         .name           = "fsl-cpm-fec",
1177         .bus            = &platform_bus_type,
1178         .probe          = fs_enet_probe,
1179         .remove         = fs_enet_remove,
1180 #ifdef CONFIG_PM
1181 /*      .suspend        = fs_enet_suspend,      TODO */
1182 /*      .resume         = fs_enet_resume,       TODO */
1183 #endif
1184 };
1185
1186 static struct device_driver fs_enet_scc_driver = {
1187         .name           = "fsl-cpm-scc",
1188         .bus            = &platform_bus_type,
1189         .probe          = fs_enet_probe,
1190         .remove         = fs_enet_remove,
1191 #ifdef CONFIG_PM
1192 /*      .suspend        = fs_enet_suspend,      TODO */
1193 /*      .resume         = fs_enet_resume,       TODO */
1194 #endif
1195 };
1196
1197 static struct device_driver fs_enet_fcc_driver = {
1198         .name           = "fsl-cpm-fcc",
1199         .bus            = &platform_bus_type,
1200         .probe          = fs_enet_probe,
1201         .remove         = fs_enet_remove,
1202 #ifdef CONFIG_PM
1203 /*      .suspend        = fs_enet_suspend,      TODO */
1204 /*      .resume         = fs_enet_resume,       TODO */
1205 #endif
1206 };
1207
1208 static int __init fs_init(void)
1209 {
1210         int r;
1211
1212         printk(KERN_INFO
1213                         "%s", version);
1214
1215         r = setup_immap();
1216         if (r != 0)
1217                 return r;
1218
1219 #ifdef CONFIG_FS_ENET_HAS_FCC
1220         /* let's insert mii stuff */
1221         r = fs_enet_mdio_bb_init();
1222
1223         if (r != 0) {
1224                 printk(KERN_ERR DRV_MODULE_NAME
1225                         "BB PHY init failed.\n");
1226                 return r;
1227         }
1228         r = driver_register(&fs_enet_fcc_driver);
1229         if (r != 0)
1230                 goto err;
1231 #endif
1232
1233 #ifdef CONFIG_FS_ENET_HAS_FEC
1234         r =  fs_enet_mdio_fec_init();
1235         if (r != 0) {
1236                 printk(KERN_ERR DRV_MODULE_NAME
1237                         "FEC PHY init failed.\n");
1238                 return r;
1239         }
1240
1241         r = driver_register(&fs_enet_fec_driver);
1242         if (r != 0)
1243                 goto err;
1244 #endif
1245
1246 #ifdef CONFIG_FS_ENET_HAS_SCC
1247         r = driver_register(&fs_enet_scc_driver);
1248         if (r != 0)
1249                 goto err;
1250 #endif
1251
1252         return 0;
1253 err:
1254         cleanup_immap();
1255         return r;
1256
1257 }
1258
1259 static void __exit fs_cleanup(void)
1260 {
1261         driver_unregister(&fs_enet_fec_driver);
1262         driver_unregister(&fs_enet_fcc_driver);
1263         driver_unregister(&fs_enet_scc_driver);
1264         cleanup_immap();
1265 }
1266
1267 /**************************************************************************************/
1268
1269 module_init(fs_init);
1270 module_exit(fs_cleanup);