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/pci.h>
  28 #include <linux/init.h>
  29 #include <linux/delay.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/skbuff.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/mii.h>
  35 #include <linux/ethtool.h>
  36 #include <linux/bitops.h>
  37 #include <linux/fs.h>
  38 #include <linux/platform_device.h>
  39 #include <linux/phy.h>
  40
  41 #include <linux/vmalloc.h>
  42 #include <asm/pgtable.h>
  43
  44 #include <asm/pgtable.h>
  45 #include <asm/irq.h>
  46 #include <asm/uaccess.h>
  47
  48 #include "fs_enet.h"
  49
  50 /*************************************************/
  51
  52 static char version[] __devinitdata =
  53     DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")" "\n";
  54
  55 MODULE_AUTHOR("Pantelis Antoniou <panto@intracom.gr>");
  56 MODULE_DESCRIPTION("Freescale Ethernet Driver");
  57 MODULE_LICENSE("GPL");
  58 MODULE_VERSION(DRV_MODULE_VERSION);
  59
  60 int fs_enet_debug = -1;         /* -1 == use FS_ENET_DEF_MSG_ENABLE as value */
  61 module_param(fs_enet_debug, int, 0);
  62 MODULE_PARM_DESC(fs_enet_debug,
  63                  "Freescale bitmapped debugging message enable value");
  64
  65
  66 static void fs_set_multicast_list(struct net_device *dev)
  67 {
  68         struct fs_enet_private *fep = netdev_priv(dev);
  69
  70         (*fep->ops->set_multicast_list)(dev);
  71 }
  72
  73 /* NAPI receive function */
  74 static int fs_enet_rx_napi(struct net_device *dev, int *budget)
  75 {
  76         struct fs_enet_private *fep = netdev_priv(dev);
  77         const struct fs_platform_info *fpi = fep->fpi;
  78         cbd_t *bdp;
  79         struct sk_buff *skb, *skbn, *skbt;
  80         int received = 0;
  81         u16 pkt_len, sc;
  82         int curidx;
  83         int rx_work_limit = 0;  /* pacify gcc */
  84
  85         rx_work_limit = min(dev->quota, *budget);
  86
  87         if (!netif_running(dev))
  88                 return 0;
  89
  90         /*
  91          * First, grab all of the stats for the incoming packet.
  92          * These get messed up if we get called due to a busy condition.
  93          */
  94         bdp = fep->cur_rx;
  95
  96         /* clear RX status bits for napi*/
  97         (*fep->ops->napi_clear_rx_event)(dev);
  98
  99         while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
 100
 101                 curidx = bdp - fep->rx_bd_base;
 102
 103                 /*
 104                  * Since we have allocated space to hold a complete frame,
 105                  * the last indicator should be set.
 106                  */
 107                 if ((sc & BD_ENET_RX_LAST) == 0)
 108                         printk(KERN_WARNING DRV_MODULE_NAME
 109                                ": %s rcv is not +last\n",
 110                                dev->name);
 111
 112                 /*
 113                  * Check for errors.
 114                  */
 115                 if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
 116                           BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
 117                         fep->stats.rx_errors++;
 118                         /* Frame too long or too short. */
 119                         if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
 120                                 fep->stats.rx_length_errors++;
 121                         /* Frame alignment */
 122                         if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
 123                                 fep->stats.rx_frame_errors++;
 124                         /* CRC Error */
 125                         if (sc & BD_ENET_RX_CR)
 126                                 fep->stats.rx_crc_errors++;
 127                         /* FIFO overrun */
 128                         if (sc & BD_ENET_RX_OV)
 129                                 fep->stats.rx_crc_errors++;
 130
 131                         skb = fep->rx_skbuff[curidx];
 132
 133                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 134                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 135                                 DMA_FROM_DEVICE);
 136
 137                         skbn = skb;
 138
 139                 } else {
 140
 141                         /* napi, got packet but no quota */
 142                         if (--rx_work_limit < 0)
 143                                 break;
 144
 145                         skb = fep->rx_skbuff[curidx];
 146
 147                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 148                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 149                                 DMA_FROM_DEVICE);
 150
 151                         /*
 152                          * Process the incoming frame.
 153                          */
 154                         fep->stats.rx_packets++;
 155                         pkt_len = CBDR_DATLEN(bdp) - 4; /* remove CRC */
 156                         fep->stats.rx_bytes += pkt_len + 4;
 157
 158                         if (pkt_len <= fpi->rx_copybreak) {
 159                                 /* +2 to make IP header L1 cache aligned */
 160                                 skbn = dev_alloc_skb(pkt_len + 2);
 161                                 if (skbn != NULL) {
 162                                         skb_reserve(skbn, 2);   /* align IP header */
 163                                         memcpy(skbn->data, skb->data, pkt_len);
 164                                         /* swap */
 165                                         skbt = skb;
 166                                         skb = skbn;
 167                                         skbn = skbt;
 168                                 }
 169                         } else
 170                                 skbn = dev_alloc_skb(ENET_RX_FRSIZE);
 171
 172                         if (skbn != NULL) {
 173                                 skb->dev = dev;
 174                                 skb_put(skb, pkt_len);  /* Make room */
 175                                 skb->protocol = eth_type_trans(skb, dev);
 176                                 received++;
 177                                 netif_receive_skb(skb);
 178                         } else {
 179                                 printk(KERN_WARNING DRV_MODULE_NAME
 180                                        ": %s Memory squeeze, dropping packet.\n",
 181                                        dev->name);
 182                                 fep->stats.rx_dropped++;
 183                                 skbn = skb;
 184                         }
 185                 }
 186
 187                 fep->rx_skbuff[curidx] = skbn;
 188                 CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
 189                              L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 190                              DMA_FROM_DEVICE));
 191                 CBDW_DATLEN(bdp, 0);
 192                 CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
 193
 194                 /*
 195                  * Update BD pointer to next entry.
 196                  */
 197                 if ((sc & BD_ENET_RX_WRAP) == 0)
 198                         bdp++;
 199                 else
 200                         bdp = fep->rx_bd_base;
 201
 202                 (*fep->ops->rx_bd_done)(dev);
 203         }
 204
 205         fep->cur_rx = bdp;
 206
 207         dev->quota -= received;
 208         *budget -= received;
 209
 210         if (rx_work_limit < 0)
 211                 return 1;       /* not done */
 212
 213         /* done */
 214         netif_rx_complete(dev);
 215
 216         (*fep->ops->napi_enable_rx)(dev);
 217
 218         return 0;
 219 }
 220
 221 /* non NAPI receive function */
 222 static int fs_enet_rx_non_napi(struct net_device *dev)
 223 {
 224         struct fs_enet_private *fep = netdev_priv(dev);
 225         const struct fs_platform_info *fpi = fep->fpi;
 226         cbd_t *bdp;
 227         struct sk_buff *skb, *skbn, *skbt;
 228         int received = 0;
 229         u16 pkt_len, sc;
 230         int curidx;
 231         /*
 232          * First, grab all of the stats for the incoming packet.
 233          * These get messed up if we get called due to a busy condition.
 234          */
 235         bdp = fep->cur_rx;
 236
 237         while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
 238
 239                 curidx = bdp - fep->rx_bd_base;
 240
 241                 /*
 242                  * Since we have allocated space to hold a complete frame,
 243                  * the last indicator should be set.
 244                  */
 245                 if ((sc & BD_ENET_RX_LAST) == 0)
 246                         printk(KERN_WARNING DRV_MODULE_NAME
 247                                ": %s rcv is not +last\n",
 248                                dev->name);
 249
 250                 /*
 251                  * Check for errors.
 252                  */
 253                 if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
 254                           BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
 255                         fep->stats.rx_errors++;
 256                         /* Frame too long or too short. */
 257                         if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
 258                                 fep->stats.rx_length_errors++;
 259                         /* Frame alignment */
 260                         if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
 261                                 fep->stats.rx_frame_errors++;
 262                         /* CRC Error */
 263                         if (sc & BD_ENET_RX_CR)
 264                                 fep->stats.rx_crc_errors++;
 265                         /* FIFO overrun */
 266                         if (sc & BD_ENET_RX_OV)
 267                                 fep->stats.rx_crc_errors++;
 268
 269                         skb = fep->rx_skbuff[curidx];
 270
 271                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 272                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 273                                 DMA_FROM_DEVICE);
 274
 275                         skbn = skb;
 276
 277                 } else {
 278
 279                         skb = fep->rx_skbuff[curidx];
 280
 281                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 282                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 283                                 DMA_FROM_DEVICE);
 284
 285                         /*
 286                          * Process the incoming frame.
 287                          */
 288                         fep->stats.rx_packets++;
 289                         pkt_len = CBDR_DATLEN(bdp) - 4; /* remove CRC */
 290                         fep->stats.rx_bytes += pkt_len + 4;
 291
 292                         if (pkt_len <= fpi->rx_copybreak) {
 293                                 /* +2 to make IP header L1 cache aligned */
 294                                 skbn = dev_alloc_skb(pkt_len + 2);
 295                                 if (skbn != NULL) {
 296                                         skb_reserve(skbn, 2);   /* align IP header */
 297                                         memcpy(skbn->data, skb->data, pkt_len);
 298                                         /* swap */
 299                                         skbt = skb;
 300                                         skb = skbn;
 301                                         skbn = skbt;
 302                                 }
 303                         } else
 304                                 skbn = dev_alloc_skb(ENET_RX_FRSIZE);
 305
 306                         if (skbn != NULL) {
 307                                 skb->dev = dev;
 308                                 skb_put(skb, pkt_len);  /* Make room */
 309                                 skb->protocol = eth_type_trans(skb, dev);
 310                                 received++;
 311                                 netif_rx(skb);
 312                         } else {
 313                                 printk(KERN_WARNING DRV_MODULE_NAME
 314                                        ": %s Memory squeeze, dropping packet.\n",
 315                                        dev->name);
 316                                 fep->stats.rx_dropped++;
 317                                 skbn = skb;
 318                         }
 319                 }
 320
 321                 fep->rx_skbuff[curidx] = skbn;
 322                 CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
 323                              L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 324                              DMA_FROM_DEVICE));
 325                 CBDW_DATLEN(bdp, 0);
 326                 CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
 327
 328                 /*
 329                  * Update BD pointer to next entry.
 330                  */
 331                 if ((sc & BD_ENET_RX_WRAP) == 0)
 332                         bdp++;
 333                 else
 334                         bdp = fep->rx_bd_base;
 335
 336                 (*fep->ops->rx_bd_done)(dev);
 337         }
 338
 339         fep->cur_rx = bdp;
 340
 341         return 0;
 342 }
 343
 344 static void fs_enet_tx(struct net_device *dev)
 345 {
 346         struct fs_enet_private *fep = netdev_priv(dev);
 347         cbd_t *bdp;
 348         struct sk_buff *skb;
 349         int dirtyidx, do_wake, do_restart;
 350         u16 sc;
 351
 352         spin_lock(&fep->lock);
 353         bdp = fep->dirty_tx;
 354
 355         do_wake = do_restart = 0;
 356         while (((sc = CBDR_SC(bdp)) & BD_ENET_TX_READY) == 0) {
 357
 358                 dirtyidx = bdp - fep->tx_bd_base;
 359
 360                 if (fep->tx_free == fep->tx_ring)
 361                         break;
 362
 363                 skb = fep->tx_skbuff[dirtyidx];
 364
 365                 /*
 366                  * Check for errors.
 367                  */
 368                 if (sc & (BD_ENET_TX_HB | BD_ENET_TX_LC |
 369                           BD_ENET_TX_RL | BD_ENET_TX_UN | BD_ENET_TX_CSL)) {
 370
 371                         if (sc & BD_ENET_TX_HB) /* No heartbeat */
 372                                 fep->stats.tx_heartbeat_errors++;
 373                         if (sc & BD_ENET_TX_LC) /* Late collision */
 374                                 fep->stats.tx_window_errors++;
 375                         if (sc & BD_ENET_TX_RL) /* Retrans limit */
 376                                 fep->stats.tx_aborted_errors++;
 377                         if (sc & BD_ENET_TX_UN) /* Underrun */
 378                                 fep->stats.tx_fifo_errors++;
 379                         if (sc & BD_ENET_TX_CSL)        /* Carrier lost */
 380                                 fep->stats.tx_carrier_errors++;
 381
 382                         if (sc & (BD_ENET_TX_LC | BD_ENET_TX_RL | BD_ENET_TX_UN)) {
 383                                 fep->stats.tx_errors++;
 384                                 do_restart = 1;
 385                         }
 386                 } else
 387                         fep->stats.tx_packets++;
 388
 389                 if (sc & BD_ENET_TX_READY)
 390                         printk(KERN_WARNING DRV_MODULE_NAME
 391                                ": %s HEY! Enet xmit interrupt and TX_READY.\n",
 392                                dev->name);
 393
 394                 /*
 395                  * Deferred means some collisions occurred during transmit,
 396                  * but we eventually sent the packet OK.
 397                  */
 398                 if (sc & BD_ENET_TX_DEF)
 399                         fep->stats.collisions++;
 400
 401                 /* unmap */
 402                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 403                                 skb->len, DMA_TO_DEVICE);
 404
 405                 /*
 406                  * Free the sk buffer associated with this last transmit.
 407                  */
 408                 dev_kfree_skb_irq(skb);
 409                 fep->tx_skbuff[dirtyidx] = NULL;
 410
 411                 /*
 412                  * Update pointer to next buffer descriptor to be transmitted.
 413                  */
 414                 if ((sc & BD_ENET_TX_WRAP) == 0)
 415                         bdp++;
 416                 else
 417                         bdp = fep->tx_bd_base;
 418
 419                 /*
 420                  * Since we have freed up a buffer, the ring is no longer
 421                  * full.
 422                  */
 423                 if (!fep->tx_free++)
 424                         do_wake = 1;
 425         }
 426
 427         fep->dirty_tx = bdp;
 428
 429         if (do_restart)
 430                 (*fep->ops->tx_restart)(dev);
 431
 432         spin_unlock(&fep->lock);
 433
 434         if (do_wake)
 435                 netif_wake_queue(dev);
 436 }
 437
 438 /*
 439  * The interrupt handler.
 440  * This is called from the MPC core interrupt.
 441  */
 442 static irqreturn_t
 443 fs_enet_interrupt(int irq, void *dev_id)
 444 {
 445         struct net_device *dev = dev_id;
 446         struct fs_enet_private *fep;
 447         const struct fs_platform_info *fpi;
 448         u32 int_events;
 449         u32 int_clr_events;
 450         int nr, napi_ok;
 451         int handled;
 452
 453         fep = netdev_priv(dev);
 454         fpi = fep->fpi;
 455
 456         nr = 0;
 457         while ((int_events = (*fep->ops->get_int_events)(dev)) != 0) {
 458
 459                 nr++;
 460
 461                 int_clr_events = int_events;
 462                 if (fpi->use_napi)
 463                         int_clr_events &= ~fep->ev_napi_rx;
 464
 465                 (*fep->ops->clear_int_events)(dev, int_clr_events);
 466
 467                 if (int_events & fep->ev_err)
 468                         (*fep->ops->ev_error)(dev, int_events);
 469
 470                 if (int_events & fep->ev_rx) {
 471                         if (!fpi->use_napi)
 472                                 fs_enet_rx_non_napi(dev);
 473                         else {
 474                                 napi_ok = netif_rx_schedule_prep(dev);
 475
 476                                 (*fep->ops->napi_disable_rx)(dev);
 477                                 (*fep->ops->clear_int_events)(dev, fep->ev_napi_rx);
 478
 479                                 /* NOTE: it is possible for FCCs in NAPI mode    */
 480                                 /* to submit a spurious interrupt while in poll  */
 481                                 if (napi_ok)
 482                                         __netif_rx_schedule(dev);
 483                         }
 484                 }
 485
 486                 if (int_events & fep->ev_tx)
 487                         fs_enet_tx(dev);
 488         }
 489
 490         handled = nr > 0;
 491         return IRQ_RETVAL(handled);
 492 }
 493
 494 void fs_init_bds(struct net_device *dev)
 495 {
 496         struct fs_enet_private *fep = netdev_priv(dev);
 497         cbd_t *bdp;
 498         struct sk_buff *skb;
 499         int i;
 500
 501         fs_cleanup_bds(dev);
 502
 503         fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
 504         fep->tx_free = fep->tx_ring;
 505         fep->cur_rx = fep->rx_bd_base;
 506
 507         /*
 508          * Initialize the receive buffer descriptors.
 509          */
 510         for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
 511                 skb = dev_alloc_skb(ENET_RX_FRSIZE);
 512                 if (skb == NULL) {
 513                         printk(KERN_WARNING DRV_MODULE_NAME
 514                                ": %s Memory squeeze, unable to allocate skb\n",
 515                                dev->name);
 516                         break;
 517                 }
 518                 fep->rx_skbuff[i] = skb;
 519                 skb->dev = dev;
 520                 CBDW_BUFADDR(bdp,
 521                         dma_map_single(fep->dev, skb->data,
 522                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 523                                 DMA_FROM_DEVICE));
 524                 CBDW_DATLEN(bdp, 0);    /* zero */
 525                 CBDW_SC(bdp, BD_ENET_RX_EMPTY |
 526                         ((i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP));
 527         }
 528         /*
 529          * if we failed, fillup remainder
 530          */
 531         for (; i < fep->rx_ring; i++, bdp++) {
 532                 fep->rx_skbuff[i] = NULL;
 533                 CBDW_SC(bdp, (i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP);
 534         }
 535
 536         /*
 537          * ...and the same for transmit.
 538          */
 539         for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
 540                 fep->tx_skbuff[i] = NULL;
 541                 CBDW_BUFADDR(bdp, 0);
 542                 CBDW_DATLEN(bdp, 0);
 543                 CBDW_SC(bdp, (i < fep->tx_ring - 1) ? 0 : BD_SC_WRAP);
 544         }
 545 }
 546
 547 void fs_cleanup_bds(struct net_device *dev)
 548 {
 549         struct fs_enet_private *fep = netdev_priv(dev);
 550         struct sk_buff *skb;
 551         cbd_t *bdp;
 552         int i;
 553
 554         /*
 555          * Reset SKB transmit buffers.
 556          */
 557         for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
 558                 if ((skb = fep->tx_skbuff[i]) == NULL)
 559                         continue;
 560
 561                 /* unmap */
 562                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 563                                 skb->len, DMA_TO_DEVICE);
 564
 565                 fep->tx_skbuff[i] = NULL;
 566                 dev_kfree_skb(skb);
 567         }
 568
 569         /*
 570          * Reset SKB receive buffers
 571          */
 572         for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
 573                 if ((skb = fep->rx_skbuff[i]) == NULL)
 574                         continue;
 575
 576                 /* unmap */
 577                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 578                         L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 579                         DMA_FROM_DEVICE);
 580
 581                 fep->rx_skbuff[i] = NULL;
 582
 583                 dev_kfree_skb(skb);
 584         }
 585 }
 586
 587 /**********************************************************************************/
 588
 589 static int fs_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
 590 {
 591         struct fs_enet_private *fep = netdev_priv(dev);
 592         cbd_t *bdp;
 593         int curidx;
 594         u16 sc;
 595         unsigned long flags;
 596
 597         spin_lock_irqsave(&fep->tx_lock, flags);
 598
 599         /*
 600          * Fill in a Tx ring entry
 601          */
 602         bdp = fep->cur_tx;
 603
 604         if (!fep->tx_free || (CBDR_SC(bdp) & BD_ENET_TX_READY)) {
 605                 netif_stop_queue(dev);
 606                 spin_unlock_irqrestore(&fep->tx_lock, flags);
 607
 608                 /*
 609                  * Ooops.  All transmit buffers are full.  Bail out.
 610                  * This should not happen, since the tx queue should be stopped.
 611                  */
 612                 printk(KERN_WARNING DRV_MODULE_NAME
 613                        ": %s tx queue full!.\n", dev->name);
 614                 return NETDEV_TX_BUSY;
 615         }
 616
 617         curidx = bdp - fep->tx_bd_base;
 618         /*
 619          * Clear all of the status flags.
 620          */
 621         CBDC_SC(bdp, BD_ENET_TX_STATS);
 622
 623         /*
 624          * Save skb pointer.
 625          */
 626         fep->tx_skbuff[curidx] = skb;
 627
 628         fep->stats.tx_bytes += skb->len;
 629
 630         /*
 631          * Push the data cache so the CPM does not get stale memory data.
 632          */
 633         CBDW_BUFADDR(bdp, dma_map_single(fep->dev,
 634                                 skb->data, skb->len, DMA_TO_DEVICE));
 635         CBDW_DATLEN(bdp, skb->len);
 636
 637         dev->trans_start = jiffies;
 638
 639         /*
 640          * If this was the last BD in the ring, start at the beginning again.
 641          */
 642         if ((CBDR_SC(bdp) & BD_ENET_TX_WRAP) == 0)
 643                 fep->cur_tx++;
 644         else
 645                 fep->cur_tx = fep->tx_bd_base;
 646
 647         if (!--fep->tx_free)
 648                 netif_stop_queue(dev);
 649
 650         /* Trigger transmission start */
 651         sc = BD_ENET_TX_READY | BD_ENET_TX_INTR |
 652              BD_ENET_TX_LAST | BD_ENET_TX_TC;
 653
 654         /* note that while FEC does not have this bit
 655          * it marks it as available for software use
 656          * yay for hw reuse :) */
 657         if (skb->len <= 60)
 658                 sc |= BD_ENET_TX_PAD;
 659         CBDS_SC(bdp, sc);
 660
 661         (*fep->ops->tx_kickstart)(dev);
 662
 663         spin_unlock_irqrestore(&fep->tx_lock, flags);
 664
 665         return NETDEV_TX_OK;
 666 }
 667
 668 static int fs_request_irq(struct net_device *dev, int irq, const char *name,
 669                 irq_handler_t irqf)
 670 {
 671         struct fs_enet_private *fep = netdev_priv(dev);
 672
 673         (*fep->ops->pre_request_irq)(dev, irq);
 674         return request_irq(irq, irqf, IRQF_SHARED, name, dev);
 675 }
 676
 677 static void fs_free_irq(struct net_device *dev, int irq)
 678 {
 679         struct fs_enet_private *fep = netdev_priv(dev);
 680
 681         free_irq(irq, dev);
 682         (*fep->ops->post_free_irq)(dev, irq);
 683 }
 684
 685 static void fs_timeout(struct net_device *dev)
 686 {
 687         struct fs_enet_private *fep = netdev_priv(dev);
 688         unsigned long flags;
 689         int wake = 0;
 690
 691         fep->stats.tx_errors++;
 692
 693         spin_lock_irqsave(&fep->lock, flags);
 694
 695         if (dev->flags & IFF_UP) {
 696                 phy_stop(fep->phydev);
 697                 (*fep->ops->stop)(dev);
 698                 (*fep->ops->restart)(dev);
 699                 phy_start(fep->phydev);
 700         }
 701
 702         phy_start(fep->phydev);
 703         wake = fep->tx_free && !(CBDR_SC(fep->cur_tx) & BD_ENET_TX_READY);
 704         spin_unlock_irqrestore(&fep->lock, flags);
 705
 706         if (wake)
 707                 netif_wake_queue(dev);
 708 }
 709
 710 /*-----------------------------------------------------------------------------
 711  *  generic link-change handler - should be sufficient for most cases
 712  *-----------------------------------------------------------------------------*/
 713 static void generic_adjust_link(struct  net_device *dev)
 714 {
 715        struct fs_enet_private *fep = netdev_priv(dev);
 716        struct phy_device *phydev = fep->phydev;
 717        int new_state = 0;
 718
 719        if (phydev->link) {
 720
 721                /* adjust to duplex mode */
 722                if (phydev->duplex != fep->oldduplex){
 723                        new_state = 1;
 724                        fep->oldduplex = phydev->duplex;
 725                }
 726
 727                if (phydev->speed != fep->oldspeed) {
 728                        new_state = 1;
 729                        fep->oldspeed = phydev->speed;
 730                }
 731
 732                if (!fep->oldlink) {
 733                        new_state = 1;
 734                        fep->oldlink = 1;
 735                        netif_schedule(dev);
 736                        netif_carrier_on(dev);
 737                        netif_start_queue(dev);
 738                }
 739
 740                if (new_state)
 741                        fep->ops->restart(dev);
 742
 743        } else if (fep->oldlink) {
 744                new_state = 1;
 745                fep->oldlink = 0;
 746                fep->oldspeed = 0;
 747                fep->oldduplex = -1;
 748                netif_carrier_off(dev);
 749                netif_stop_queue(dev);
 750        }
 751
 752        if (new_state && netif_msg_link(fep))
 753                phy_print_status(phydev);
 754 }
 755
 756
 757 static void fs_adjust_link(struct net_device *dev)
 758 {
 759         struct fs_enet_private *fep = netdev_priv(dev);
 760         unsigned long flags;
 761
 762         spin_lock_irqsave(&fep->lock, flags);
 763
 764         if(fep->ops->adjust_link)
 765                 fep->ops->adjust_link(dev);
 766         else
 767                 generic_adjust_link(dev);
 768
 769         spin_unlock_irqrestore(&fep->lock, flags);
 770 }
 771
 772 static int fs_init_phy(struct net_device *dev)
 773 {
 774         struct fs_enet_private *fep = netdev_priv(dev);
 775         struct phy_device *phydev;
 776
 777         fep->oldlink = 0;
 778         fep->oldspeed = 0;
 779         fep->oldduplex = -1;
 780         if(fep->fpi->bus_id)
 781                 phydev = phy_connect(dev, fep->fpi->bus_id, &fs_adjust_link, 0,
 782                                 PHY_INTERFACE_MODE_MII);
 783         else {
 784                 printk("No phy bus ID specified in BSP code\n");
 785                 return -EINVAL;
 786         }
 787         if (IS_ERR(phydev)) {
 788                 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
 789                 return PTR_ERR(phydev);
 790         }
 791
 792         fep->phydev = phydev;
 793
 794         return 0;
 795 }
 796
 797
 798 static int fs_enet_open(struct net_device *dev)
 799 {
 800         struct fs_enet_private *fep = netdev_priv(dev);
 801         int r;
 802         int err;
 803
 804         /* Install our interrupt handler. */
 805         r = fs_request_irq(dev, fep->interrupt, "fs_enet-mac", fs_enet_interrupt);
 806         if (r != 0) {
 807                 printk(KERN_ERR DRV_MODULE_NAME
 808                        ": %s Could not allocate FS_ENET IRQ!", dev->name);
 809                 return -EINVAL;
 810         }
 811
 812         err = fs_init_phy(dev);
 813         if(err)
 814                 return err;
 815
 816         phy_start(fep->phydev);
 817
 818         return 0;
 819 }
 820
 821 static int fs_enet_close(struct net_device *dev)
 822 {
 823         struct fs_enet_private *fep = netdev_priv(dev);
 824         unsigned long flags;
 825
 826         netif_stop_queue(dev);
 827         netif_carrier_off(dev);
 828         phy_stop(fep->phydev);
 829
 830         spin_lock_irqsave(&fep->lock, flags);
 831         (*fep->ops->stop)(dev);
 832         spin_unlock_irqrestore(&fep->lock, flags);
 833
 834         /* release any irqs */
 835         phy_disconnect(fep->phydev);
 836         fep->phydev = NULL;
 837         fs_free_irq(dev, fep->interrupt);
 838
 839         return 0;
 840 }
 841
 842 static struct net_device_stats *fs_enet_get_stats(struct net_device *dev)
 843 {
 844         struct fs_enet_private *fep = netdev_priv(dev);
 845         return &fep->stats;
 846 }
 847
 848 /*************************************************************************/
 849
 850 static void fs_get_drvinfo(struct net_device *dev,
 851                             struct ethtool_drvinfo *info)
 852 {
 853         strcpy(info->driver, DRV_MODULE_NAME);
 854         strcpy(info->version, DRV_MODULE_VERSION);
 855 }
 856
 857 static int fs_get_regs_len(struct net_device *dev)
 858 {
 859         struct fs_enet_private *fep = netdev_priv(dev);
 860
 861         return (*fep->ops->get_regs_len)(dev);
 862 }
 863
 864 static void fs_get_regs(struct net_device *dev, struct ethtool_regs *regs,
 865                          void *p)
 866 {
 867         struct fs_enet_private *fep = netdev_priv(dev);
 868         unsigned long flags;
 869         int r, len;
 870
 871         len = regs->len;
 872
 873         spin_lock_irqsave(&fep->lock, flags);
 874         r = (*fep->ops->get_regs)(dev, p, &len);
 875         spin_unlock_irqrestore(&fep->lock, flags);
 876
 877         if (r == 0)
 878                 regs->version = 0;
 879 }
 880
 881 static int fs_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 882 {
 883         struct fs_enet_private *fep = netdev_priv(dev);
 884         return phy_ethtool_gset(fep->phydev, cmd);
 885 }
 886
 887 static int fs_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 888 {
 889         struct fs_enet_private *fep = netdev_priv(dev);
 890         phy_ethtool_sset(fep->phydev, cmd);
 891         return 0;
 892 }
 893
 894 static int fs_nway_reset(struct net_device *dev)
 895 {
 896         return 0;
 897 }
 898
 899 static u32 fs_get_msglevel(struct net_device *dev)
 900 {
 901         struct fs_enet_private *fep = netdev_priv(dev);
 902         return fep->msg_enable;
 903 }
 904
 905 static void fs_set_msglevel(struct net_device *dev, u32 value)
 906 {
 907         struct fs_enet_private *fep = netdev_priv(dev);
 908         fep->msg_enable = value;
 909 }
 910
 911 static const struct ethtool_ops fs_ethtool_ops = {
 912         .get_drvinfo = fs_get_drvinfo,
 913         .get_regs_len = fs_get_regs_len,
 914         .get_settings = fs_get_settings,
 915         .set_settings = fs_set_settings,
 916         .nway_reset = fs_nway_reset,
 917         .get_link = ethtool_op_get_link,
 918         .get_msglevel = fs_get_msglevel,
 919         .set_msglevel = fs_set_msglevel,
 920         .get_tx_csum = ethtool_op_get_tx_csum,
 921         .set_tx_csum = ethtool_op_set_tx_csum,  /* local! */
 922         .get_sg = ethtool_op_get_sg,
 923         .set_sg = ethtool_op_set_sg,
 924         .get_regs = fs_get_regs,
 925 };
 926
 927 static int fs_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 928 {
 929         struct fs_enet_private *fep = netdev_priv(dev);
 930         struct mii_ioctl_data *mii = (struct mii_ioctl_data *)&rq->ifr_data;
 931         unsigned long flags;
 932         int rc;
 933
 934         if (!netif_running(dev))
 935                 return -EINVAL;
 936
 937         spin_lock_irqsave(&fep->lock, flags);
 938         rc = phy_mii_ioctl(fep->phydev, mii, cmd);
 939         spin_unlock_irqrestore(&fep->lock, flags);
 940         return rc;
 941 }
 942
 943 extern int fs_mii_connect(struct net_device *dev);
 944 extern void fs_mii_disconnect(struct net_device *dev);
 945
 946 static struct net_device *fs_init_instance(struct device *dev,
 947                 struct fs_platform_info *fpi)
 948 {
 949         struct net_device *ndev = NULL;
 950         struct fs_enet_private *fep = NULL;
 951         int privsize, i, r, err = 0, registered = 0;
 952
 953         fpi->fs_no = fs_get_id(fpi);
 954         /* guard */
 955         if ((unsigned int)fpi->fs_no >= FS_MAX_INDEX)
 956                 return ERR_PTR(-EINVAL);
 957
 958         privsize = sizeof(*fep) + (sizeof(struct sk_buff **) *
 959                             (fpi->rx_ring + fpi->tx_ring));
 960
 961         ndev = alloc_etherdev(privsize);
 962         if (!ndev) {
 963                 err = -ENOMEM;
 964                 goto err;
 965         }
 966         SET_MODULE_OWNER(ndev);
 967
 968         fep = netdev_priv(ndev);
 969         memset(fep, 0, privsize);       /* clear everything */
 970
 971         fep->dev = dev;
 972         dev_set_drvdata(dev, ndev);
 973         fep->fpi = fpi;
 974         if (fpi->init_ioports)
 975                 fpi->init_ioports((struct fs_platform_info *)fpi);
 976
 977 #ifdef CONFIG_FS_ENET_HAS_FEC
 978         if (fs_get_fec_index(fpi->fs_no) >= 0)
 979                 fep->ops = &fs_fec_ops;
 980 #endif
 981
 982 #ifdef CONFIG_FS_ENET_HAS_SCC
 983         if (fs_get_scc_index(fpi->fs_no) >=0 )
 984                 fep->ops = &fs_scc_ops;
 985 #endif
 986
 987 #ifdef CONFIG_FS_ENET_HAS_FCC
 988         if (fs_get_fcc_index(fpi->fs_no) >= 0)
 989                 fep->ops = &fs_fcc_ops;
 990 #endif
 991
 992         if (fep->ops == NULL) {
 993                 printk(KERN_ERR DRV_MODULE_NAME
 994                        ": %s No matching ops found (%d).\n",
 995                        ndev->name, fpi->fs_no);
 996                 err = -EINVAL;
 997                 goto err;
 998         }
 999
1000         r = (*fep->ops->setup_data)(ndev);
1001         if (r != 0) {
1002                 printk(KERN_ERR DRV_MODULE_NAME
1003                        ": %s setup_data failed\n",
1004                         ndev->name);
1005                 err = r;
1006                 goto err;
1007         }
1008
1009         /* point rx_skbuff, tx_skbuff */
1010         fep->rx_skbuff = (struct sk_buff **)&fep[1];
1011         fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;
1012
1013         /* init locks */
1014         spin_lock_init(&fep->lock);
1015         spin_lock_init(&fep->tx_lock);
1016
1017         /*
1018          * Set the Ethernet address.
1019          */
1020         for (i = 0; i < 6; i++)
1021                 ndev->dev_addr[i] = fpi->macaddr[i];
1022
1023         r = (*fep->ops->allocate_bd)(ndev);
1024
1025         if (fep->ring_base == NULL) {
1026                 printk(KERN_ERR DRV_MODULE_NAME
1027                        ": %s buffer descriptor alloc failed (%d).\n", ndev->name, r);
1028                 err = r;
1029                 goto err;
1030         }
1031
1032         /*
1033          * Set receive and transmit descriptor base.
1034          */
1035         fep->rx_bd_base = fep->ring_base;
1036         fep->tx_bd_base = fep->rx_bd_base + fpi->rx_ring;
1037
1038         /* initialize ring size variables */
1039         fep->tx_ring = fpi->tx_ring;
1040         fep->rx_ring = fpi->rx_ring;
1041
1042         /*
1043          * The FEC Ethernet specific entries in the device structure.
1044          */
1045         ndev->open = fs_enet_open;
1046         ndev->hard_start_xmit = fs_enet_start_xmit;
1047         ndev->tx_timeout = fs_timeout;
1048         ndev->watchdog_timeo = 2 * HZ;
1049         ndev->stop = fs_enet_close;
1050         ndev->get_stats = fs_enet_get_stats;
1051         ndev->set_multicast_list = fs_set_multicast_list;
1052         if (fpi->use_napi) {
1053                 ndev->poll = fs_enet_rx_napi;
1054                 ndev->weight = fpi->napi_weight;
1055         }
1056         ndev->ethtool_ops = &fs_ethtool_ops;
1057         ndev->do_ioctl = fs_ioctl;
1058
1059         init_timer(&fep->phy_timer_list);
1060
1061         netif_carrier_off(ndev);
1062
1063         err = register_netdev(ndev);
1064         if (err != 0) {
1065                 printk(KERN_ERR DRV_MODULE_NAME
1066                        ": %s register_netdev failed.\n", ndev->name);
1067                 goto err;
1068         }
1069         registered = 1;
1070
1071
1072         return ndev;
1073
1074       err:
1075         if (ndev != NULL) {
1076
1077                 if (registered)
1078                         unregister_netdev(ndev);
1079
1080                 if (fep != NULL) {
1081                         (*fep->ops->free_bd)(ndev);
1082                         (*fep->ops->cleanup_data)(ndev);
1083                 }
1084
1085                 free_netdev(ndev);
1086         }
1087
1088         dev_set_drvdata(dev, NULL);
1089
1090         return ERR_PTR(err);
1091 }
1092
1093 static int fs_cleanup_instance(struct net_device *ndev)
1094 {
1095         struct fs_enet_private *fep;
1096         const struct fs_platform_info *fpi;
1097         struct device *dev;
1098
1099         if (ndev == NULL)
1100                 return -EINVAL;
1101
1102         fep = netdev_priv(ndev);
1103         if (fep == NULL)
1104                 return -EINVAL;
1105
1106         fpi = fep->fpi;
1107
1108         unregister_netdev(ndev);
1109
1110         dma_free_coherent(fep->dev, (fpi->tx_ring + fpi->rx_ring) * sizeof(cbd_t),
1111                           fep->ring_base, fep->ring_mem_addr);
1112
1113         /* reset it */
1114         (*fep->ops->cleanup_data)(ndev);
1115
1116         dev = fep->dev;
1117         if (dev != NULL) {
1118                 dev_set_drvdata(dev, NULL);
1119                 fep->dev = NULL;
1120         }
1121
1122         free_netdev(ndev);
1123
1124         return 0;
1125 }
1126
1127 /**************************************************************************************/
1128
1129 /* handy pointer to the immap */
1130 void *fs_enet_immap = NULL;
1131
1132 static int setup_immap(void)
1133 {
1134         phys_addr_t paddr = 0;
1135         unsigned long size = 0;
1136
1137 #ifdef CONFIG_CPM1
1138         paddr = IMAP_ADDR;
1139         size = 0x10000; /* map 64K */
1140 #endif
1141
1142 #ifdef CONFIG_CPM2
1143         paddr = CPM_MAP_ADDR;
1144         size = 0x40000; /* map 256 K */
1145 #endif
1146         fs_enet_immap = ioremap(paddr, size);
1147         if (fs_enet_immap == NULL)
1148                 return -EBADF;  /* XXX ahem; maybe just BUG_ON? */
1149
1150         return 0;
1151 }
1152
1153 static void cleanup_immap(void)
1154 {
1155         if (fs_enet_immap != NULL) {
1156                 iounmap(fs_enet_immap);
1157                 fs_enet_immap = NULL;
1158         }
1159 }
1160
1161 /**************************************************************************************/
1162
1163 static int __devinit fs_enet_probe(struct device *dev)
1164 {
1165         struct net_device *ndev;
1166
1167         /* no fixup - no device */
1168         if (dev->platform_data == NULL) {
1169                 printk(KERN_INFO "fs_enet: "
1170                                 "probe called with no platform data; "
1171                                 "remove unused devices\n");
1172                 return -ENODEV;
1173         }
1174
1175         ndev = fs_init_instance(dev, dev->platform_data);
1176         if (IS_ERR(ndev))
1177                 return PTR_ERR(ndev);
1178         return 0;
1179 }
1180
1181 static int fs_enet_remove(struct device *dev)
1182 {
1183         return fs_cleanup_instance(dev_get_drvdata(dev));
1184 }
1185
1186 static struct device_driver fs_enet_fec_driver = {
1187         .name           = "fsl-cpm-fec",
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_scc_driver = {
1198         .name           = "fsl-cpm-scc",
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 struct device_driver fs_enet_fcc_driver = {
1209         .name           = "fsl-cpm-fcc",
1210         .bus            = &platform_bus_type,
1211         .probe          = fs_enet_probe,
1212         .remove         = fs_enet_remove,
1213 #ifdef CONFIG_PM
1214 /*      .suspend        = fs_enet_suspend,      TODO */
1215 /*      .resume         = fs_enet_resume,       TODO */
1216 #endif
1217 };
1218
1219 static int __init fs_init(void)
1220 {
1221         int r;
1222
1223         printk(KERN_INFO
1224                         "%s", version);
1225
1226         r = setup_immap();
1227         if (r != 0)
1228                 return r;
1229
1230 #ifdef CONFIG_FS_ENET_HAS_FCC
1231         /* let's insert mii stuff */
1232         r = fs_enet_mdio_bb_init();
1233
1234         if (r != 0) {
1235                 printk(KERN_ERR DRV_MODULE_NAME
1236                         "BB PHY init failed.\n");
1237                 return r;
1238         }
1239         r = driver_register(&fs_enet_fcc_driver);
1240         if (r != 0)
1241                 goto err;
1242 #endif
1243
1244 #ifdef CONFIG_FS_ENET_HAS_FEC
1245         r =  fs_enet_mdio_fec_init();
1246         if (r != 0) {
1247                 printk(KERN_ERR DRV_MODULE_NAME
1248                         "FEC PHY init failed.\n");
1249                 return r;
1250         }
1251
1252         r = driver_register(&fs_enet_fec_driver);
1253         if (r != 0)
1254                 goto err;
1255 #endif
1256
1257 #ifdef CONFIG_FS_ENET_HAS_SCC
1258         r = driver_register(&fs_enet_scc_driver);
1259         if (r != 0)
1260                 goto err;
1261 #endif
1262
1263         return 0;
1264 err:
1265         cleanup_immap();
1266         return r;
1267
1268 }
1269
1270 static void __exit fs_cleanup(void)
1271 {
1272         driver_unregister(&fs_enet_fec_driver);
1273         driver_unregister(&fs_enet_fcc_driver);
1274         driver_unregister(&fs_enet_scc_driver);
1275         cleanup_immap();
1276 }
1277
1278 /**************************************************************************************/
1279
1280 module_init(fs_init);
1281 module_exit(fs_cleanup);