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/sched.h>
  22 #include <linux/string.h>
  23 #include <linux/ptrace.h>
  24 #include <linux/errno.h>
  25 #include <linux/ioport.h>
  26 #include <linux/slab.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/pci.h>
  29 #include <linux/init.h>
  30 #include <linux/delay.h>
  31 #include <linux/netdevice.h>
  32 #include <linux/etherdevice.h>
  33 #include <linux/skbuff.h>
  34 #include <linux/spinlock.h>
  35 #include <linux/mii.h>
  36 #include <linux/ethtool.h>
  37 #include <linux/bitops.h>
  38 #include <linux/fs.h>
  39 #include <linux/platform_device.h>
  40 #include <linux/phy.h>
  41
  42 #include <linux/vmalloc.h>
  43 #include <asm/pgtable.h>
  44
  45 #include <asm/pgtable.h>
  46 #include <asm/irq.h>
  47 #include <asm/uaccess.h>
  48
  49 #include "fs_enet.h"
  50
  51 /*************************************************/
  52
  53 static char version[] __devinitdata =
  54     DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")" "\n";
  55
  56 MODULE_AUTHOR("Pantelis Antoniou <panto@intracom.gr>");
  57 MODULE_DESCRIPTION("Freescale Ethernet Driver");
  58 MODULE_LICENSE("GPL");
  59 MODULE_VERSION(DRV_MODULE_VERSION);
  60
  61 int fs_enet_debug = -1;         /* -1 == use FS_ENET_DEF_MSG_ENABLE as value */
  62 module_param(fs_enet_debug, int, 0);
  63 MODULE_PARM_DESC(fs_enet_debug,
  64                  "Freescale bitmapped debugging message enable value");
  65
  66
  67 static void fs_set_multicast_list(struct net_device *dev)
  68 {
  69         struct fs_enet_private *fep = netdev_priv(dev);
  70
  71         (*fep->ops->set_multicast_list)(dev);
  72 }
  73
  74 /* NAPI receive function */
  75 static int fs_enet_rx_napi(struct net_device *dev, int *budget)
  76 {
  77         struct fs_enet_private *fep = netdev_priv(dev);
  78         const struct fs_platform_info *fpi = fep->fpi;
  79         cbd_t *bdp;
  80         struct sk_buff *skb, *skbn, *skbt;
  81         int received = 0;
  82         u16 pkt_len, sc;
  83         int curidx;
  84         int rx_work_limit = 0;  /* pacify gcc */
  85
  86         rx_work_limit = min(dev->quota, *budget);
  87
  88         if (!netif_running(dev))
  89                 return 0;
  90
  91         /*
  92          * First, grab all of the stats for the incoming packet.
  93          * These get messed up if we get called due to a busy condition.
  94          */
  95         bdp = fep->cur_rx;
  96
  97         /* clear RX status bits for napi*/
  98         (*fep->ops->napi_clear_rx_event)(dev);
  99
 100         while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
 101
 102                 curidx = bdp - fep->rx_bd_base;
 103
 104                 /*
 105                  * Since we have allocated space to hold a complete frame,
 106                  * the last indicator should be set.
 107                  */
 108                 if ((sc & BD_ENET_RX_LAST) == 0)
 109                         printk(KERN_WARNING DRV_MODULE_NAME
 110                                ": %s rcv is not +last\n",
 111                                dev->name);
 112
 113                 /*
 114                  * Check for errors.
 115                  */
 116                 if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
 117                           BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
 118                         fep->stats.rx_errors++;
 119                         /* Frame too long or too short. */
 120                         if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
 121                                 fep->stats.rx_length_errors++;
 122                         /* Frame alignment */
 123                         if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
 124                                 fep->stats.rx_frame_errors++;
 125                         /* CRC Error */
 126                         if (sc & BD_ENET_RX_CR)
 127                                 fep->stats.rx_crc_errors++;
 128                         /* FIFO overrun */
 129                         if (sc & BD_ENET_RX_OV)
 130                                 fep->stats.rx_crc_errors++;
 131
 132                         skb = fep->rx_skbuff[curidx];
 133
 134                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 135                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 136                                 DMA_FROM_DEVICE);
 137
 138                         skbn = skb;
 139
 140                 } else {
 141
 142                         /* napi, got packet but no quota */
 143                         if (--rx_work_limit < 0)
 144                                 break;
 145
 146                         skb = fep->rx_skbuff[curidx];
 147
 148                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 149                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 150                                 DMA_FROM_DEVICE);
 151
 152                         /*
 153                          * Process the incoming frame.
 154                          */
 155                         fep->stats.rx_packets++;
 156                         pkt_len = CBDR_DATLEN(bdp) - 4; /* remove CRC */
 157                         fep->stats.rx_bytes += pkt_len + 4;
 158
 159                         if (pkt_len <= fpi->rx_copybreak) {
 160                                 /* +2 to make IP header L1 cache aligned */
 161                                 skbn = dev_alloc_skb(pkt_len + 2);
 162                                 if (skbn != NULL) {
 163                                         skb_reserve(skbn, 2);   /* align IP header */
 164                                         memcpy(skbn->data, skb->data, pkt_len);
 165                                         /* swap */
 166                                         skbt = skb;
 167                                         skb = skbn;
 168                                         skbn = skbt;
 169                                 }
 170                         } else
 171                                 skbn = dev_alloc_skb(ENET_RX_FRSIZE);
 172
 173                         if (skbn != NULL) {
 174                                 skb->dev = dev;
 175                                 skb_put(skb, pkt_len);  /* Make room */
 176                                 skb->protocol = eth_type_trans(skb, dev);
 177                                 received++;
 178                                 netif_receive_skb(skb);
 179                         } else {
 180                                 printk(KERN_WARNING DRV_MODULE_NAME
 181                                        ": %s Memory squeeze, dropping packet.\n",
 182                                        dev->name);
 183                                 fep->stats.rx_dropped++;
 184                                 skbn = skb;
 185                         }
 186                 }
 187
 188                 fep->rx_skbuff[curidx] = skbn;
 189                 CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
 190                              L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 191                              DMA_FROM_DEVICE));
 192                 CBDW_DATLEN(bdp, 0);
 193                 CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
 194
 195                 /*
 196                  * Update BD pointer to next entry.
 197                  */
 198                 if ((sc & BD_ENET_RX_WRAP) == 0)
 199                         bdp++;
 200                 else
 201                         bdp = fep->rx_bd_base;
 202
 203                 (*fep->ops->rx_bd_done)(dev);
 204         }
 205
 206         fep->cur_rx = bdp;
 207
 208         dev->quota -= received;
 209         *budget -= received;
 210
 211         if (rx_work_limit < 0)
 212                 return 1;       /* not done */
 213
 214         /* done */
 215         netif_rx_complete(dev);
 216
 217         (*fep->ops->napi_enable_rx)(dev);
 218
 219         return 0;
 220 }
 221
 222 /* non NAPI receive function */
 223 static int fs_enet_rx_non_napi(struct net_device *dev)
 224 {
 225         struct fs_enet_private *fep = netdev_priv(dev);
 226         const struct fs_platform_info *fpi = fep->fpi;
 227         cbd_t *bdp;
 228         struct sk_buff *skb, *skbn, *skbt;
 229         int received = 0;
 230         u16 pkt_len, sc;
 231         int curidx;
 232         /*
 233          * First, grab all of the stats for the incoming packet.
 234          * These get messed up if we get called due to a busy condition.
 235          */
 236         bdp = fep->cur_rx;
 237
 238         while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
 239
 240                 curidx = bdp - fep->rx_bd_base;
 241
 242                 /*
 243                  * Since we have allocated space to hold a complete frame,
 244                  * the last indicator should be set.
 245                  */
 246                 if ((sc & BD_ENET_RX_LAST) == 0)
 247                         printk(KERN_WARNING DRV_MODULE_NAME
 248                                ": %s rcv is not +last\n",
 249                                dev->name);
 250
 251                 /*
 252                  * Check for errors.
 253                  */
 254                 if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
 255                           BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
 256                         fep->stats.rx_errors++;
 257                         /* Frame too long or too short. */
 258                         if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
 259                                 fep->stats.rx_length_errors++;
 260                         /* Frame alignment */
 261                         if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
 262                                 fep->stats.rx_frame_errors++;
 263                         /* CRC Error */
 264                         if (sc & BD_ENET_RX_CR)
 265                                 fep->stats.rx_crc_errors++;
 266                         /* FIFO overrun */
 267                         if (sc & BD_ENET_RX_OV)
 268                                 fep->stats.rx_crc_errors++;
 269
 270                         skb = fep->rx_skbuff[curidx];
 271
 272                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 273                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 274                                 DMA_FROM_DEVICE);
 275
 276                         skbn = skb;
 277
 278                 } else {
 279
 280                         skb = fep->rx_skbuff[curidx];
 281
 282                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 283                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 284                                 DMA_FROM_DEVICE);
 285
 286                         /*
 287                          * Process the incoming frame.
 288                          */
 289                         fep->stats.rx_packets++;
 290                         pkt_len = CBDR_DATLEN(bdp) - 4; /* remove CRC */
 291                         fep->stats.rx_bytes += pkt_len + 4;
 292
 293                         if (pkt_len <= fpi->rx_copybreak) {
 294                                 /* +2 to make IP header L1 cache aligned */
 295                                 skbn = dev_alloc_skb(pkt_len + 2);
 296                                 if (skbn != NULL) {
 297                                         skb_reserve(skbn, 2);   /* align IP header */
 298                                         memcpy(skbn->data, skb->data, pkt_len);
 299                                         /* swap */
 300                                         skbt = skb;
 301                                         skb = skbn;
 302                                         skbn = skbt;
 303                                 }
 304                         } else
 305                                 skbn = dev_alloc_skb(ENET_RX_FRSIZE);
 306
 307                         if (skbn != NULL) {
 308                                 skb->dev = dev;
 309                                 skb_put(skb, pkt_len);  /* Make room */
 310                                 skb->protocol = eth_type_trans(skb, dev);
 311                                 received++;
 312                                 netif_rx(skb);
 313                         } else {
 314                                 printk(KERN_WARNING DRV_MODULE_NAME
 315                                        ": %s Memory squeeze, dropping packet.\n",
 316                                        dev->name);
 317                                 fep->stats.rx_dropped++;
 318                                 skbn = skb;
 319                         }
 320                 }
 321
 322                 fep->rx_skbuff[curidx] = skbn;
 323                 CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
 324                              L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 325                              DMA_FROM_DEVICE));
 326                 CBDW_DATLEN(bdp, 0);
 327                 CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
 328
 329                 /*
 330                  * Update BD pointer to next entry.
 331                  */
 332                 if ((sc & BD_ENET_RX_WRAP) == 0)
 333                         bdp++;
 334                 else
 335                         bdp = fep->rx_bd_base;
 336
 337                 (*fep->ops->rx_bd_done)(dev);
 338         }
 339
 340         fep->cur_rx = bdp;
 341
 342         return 0;
 343 }
 344
 345 static void fs_enet_tx(struct net_device *dev)
 346 {
 347         struct fs_enet_private *fep = netdev_priv(dev);
 348         cbd_t *bdp;
 349         struct sk_buff *skb;
 350         int dirtyidx, do_wake, do_restart;
 351         u16 sc;
 352
 353         spin_lock(&fep->lock);
 354         bdp = fep->dirty_tx;
 355
 356         do_wake = do_restart = 0;
 357         while (((sc = CBDR_SC(bdp)) & BD_ENET_TX_READY) == 0) {
 358
 359                 dirtyidx = bdp - fep->tx_bd_base;
 360
 361                 if (fep->tx_free == fep->tx_ring)
 362                         break;
 363
 364                 skb = fep->tx_skbuff[dirtyidx];
 365
 366                 /*
 367                  * Check for errors.
 368                  */
 369                 if (sc & (BD_ENET_TX_HB | BD_ENET_TX_LC |
 370                           BD_ENET_TX_RL | BD_ENET_TX_UN | BD_ENET_TX_CSL)) {
 371
 372                         if (sc & BD_ENET_TX_HB) /* No heartbeat */
 373                                 fep->stats.tx_heartbeat_errors++;
 374                         if (sc & BD_ENET_TX_LC) /* Late collision */
 375                                 fep->stats.tx_window_errors++;
 376                         if (sc & BD_ENET_TX_RL) /* Retrans limit */
 377                                 fep->stats.tx_aborted_errors++;
 378                         if (sc & BD_ENET_TX_UN) /* Underrun */
 379                                 fep->stats.tx_fifo_errors++;
 380                         if (sc & BD_ENET_TX_CSL)        /* Carrier lost */
 381                                 fep->stats.tx_carrier_errors++;
 382
 383                         if (sc & (BD_ENET_TX_LC | BD_ENET_TX_RL | BD_ENET_TX_UN)) {
 384                                 fep->stats.tx_errors++;
 385                                 do_restart = 1;
 386                         }
 387                 } else
 388                         fep->stats.tx_packets++;
 389
 390                 if (sc & BD_ENET_TX_READY)
 391                         printk(KERN_WARNING DRV_MODULE_NAME
 392                                ": %s HEY! Enet xmit interrupt and TX_READY.\n",
 393                                dev->name);
 394
 395                 /*
 396                  * Deferred means some collisions occurred during transmit,
 397                  * but we eventually sent the packet OK.
 398                  */
 399                 if (sc & BD_ENET_TX_DEF)
 400                         fep->stats.collisions++;
 401
 402                 /* unmap */
 403                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 404                                 skb->len, DMA_TO_DEVICE);
 405
 406                 /*
 407                  * Free the sk buffer associated with this last transmit.
 408                  */
 409                 dev_kfree_skb_irq(skb);
 410                 fep->tx_skbuff[dirtyidx] = NULL;
 411
 412                 /*
 413                  * Update pointer to next buffer descriptor to be transmitted.
 414                  */
 415                 if ((sc & BD_ENET_TX_WRAP) == 0)
 416                         bdp++;
 417                 else
 418                         bdp = fep->tx_bd_base;
 419
 420                 /*
 421                  * Since we have freed up a buffer, the ring is no longer
 422                  * full.
 423                  */
 424                 if (!fep->tx_free++)
 425                         do_wake = 1;
 426         }
 427
 428         fep->dirty_tx = bdp;
 429
 430         if (do_restart)
 431                 (*fep->ops->tx_restart)(dev);
 432
 433         spin_unlock(&fep->lock);
 434
 435         if (do_wake)
 436                 netif_wake_queue(dev);
 437 }
 438
 439 /*
 440  * The interrupt handler.
 441  * This is called from the MPC core interrupt.
 442  */
 443 static irqreturn_t
 444 fs_enet_interrupt(int irq, void *dev_id)
 445 {
 446         struct net_device *dev = dev_id;
 447         struct fs_enet_private *fep;
 448         const struct fs_platform_info *fpi;
 449         u32 int_events;
 450         u32 int_clr_events;
 451         int nr, napi_ok;
 452         int handled;
 453
 454         fep = netdev_priv(dev);
 455         fpi = fep->fpi;
 456
 457         nr = 0;
 458         while ((int_events = (*fep->ops->get_int_events)(dev)) != 0) {
 459
 460                 nr++;
 461
 462                 int_clr_events = int_events;
 463                 if (fpi->use_napi)
 464                         int_clr_events &= ~fep->ev_napi_rx;
 465
 466                 (*fep->ops->clear_int_events)(dev, int_clr_events);
 467
 468                 if (int_events & fep->ev_err)
 469                         (*fep->ops->ev_error)(dev, int_events);
 470
 471                 if (int_events & fep->ev_rx) {
 472                         if (!fpi->use_napi)
 473                                 fs_enet_rx_non_napi(dev);
 474                         else {
 475                                 napi_ok = netif_rx_schedule_prep(dev);
 476
 477                                 (*fep->ops->napi_disable_rx)(dev);
 478                                 (*fep->ops->clear_int_events)(dev, fep->ev_napi_rx);
 479
 480                                 /* NOTE: it is possible for FCCs in NAPI mode    */
 481                                 /* to submit a spurious interrupt while in poll  */
 482                                 if (napi_ok)
 483                                         __netif_rx_schedule(dev);
 484                         }
 485                 }
 486
 487                 if (int_events & fep->ev_tx)
 488                         fs_enet_tx(dev);
 489         }
 490
 491         handled = nr > 0;
 492         return IRQ_RETVAL(handled);
 493 }
 494
 495 void fs_init_bds(struct net_device *dev)
 496 {
 497         struct fs_enet_private *fep = netdev_priv(dev);
 498         cbd_t *bdp;
 499         struct sk_buff *skb;
 500         int i;
 501
 502         fs_cleanup_bds(dev);
 503
 504         fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
 505         fep->tx_free = fep->tx_ring;
 506         fep->cur_rx = fep->rx_bd_base;
 507
 508         /*
 509          * Initialize the receive buffer descriptors.
 510          */
 511         for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
 512                 skb = dev_alloc_skb(ENET_RX_FRSIZE);
 513                 if (skb == NULL) {
 514                         printk(KERN_WARNING DRV_MODULE_NAME
 515                                ": %s Memory squeeze, unable to allocate skb\n",
 516                                dev->name);
 517                         break;
 518                 }
 519                 fep->rx_skbuff[i] = skb;
 520                 skb->dev = dev;
 521                 CBDW_BUFADDR(bdp,
 522                         dma_map_single(fep->dev, skb->data,
 523                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 524                                 DMA_FROM_DEVICE));
 525                 CBDW_DATLEN(bdp, 0);    /* zero */
 526                 CBDW_SC(bdp, BD_ENET_RX_EMPTY |
 527                         ((i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP));
 528         }
 529         /*
 530          * if we failed, fillup remainder
 531          */
 532         for (; i < fep->rx_ring; i++, bdp++) {
 533                 fep->rx_skbuff[i] = NULL;
 534                 CBDW_SC(bdp, (i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP);
 535         }
 536
 537         /*
 538          * ...and the same for transmit.
 539          */
 540         for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
 541                 fep->tx_skbuff[i] = NULL;
 542                 CBDW_BUFADDR(bdp, 0);
 543                 CBDW_DATLEN(bdp, 0);
 544                 CBDW_SC(bdp, (i < fep->tx_ring - 1) ? 0 : BD_SC_WRAP);
 545         }
 546 }
 547
 548 void fs_cleanup_bds(struct net_device *dev)
 549 {
 550         struct fs_enet_private *fep = netdev_priv(dev);
 551         struct sk_buff *skb;
 552         cbd_t *bdp;
 553         int i;
 554
 555         /*
 556          * Reset SKB transmit buffers.
 557          */
 558         for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
 559                 if ((skb = fep->tx_skbuff[i]) == NULL)
 560                         continue;
 561
 562                 /* unmap */
 563                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 564                                 skb->len, DMA_TO_DEVICE);
 565
 566                 fep->tx_skbuff[i] = NULL;
 567                 dev_kfree_skb(skb);
 568         }
 569
 570         /*
 571          * Reset SKB receive buffers
 572          */
 573         for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
 574                 if ((skb = fep->rx_skbuff[i]) == NULL)
 575                         continue;
 576
 577                 /* unmap */
 578                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 579                         L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 580                         DMA_FROM_DEVICE);
 581
 582                 fep->rx_skbuff[i] = NULL;
 583
 584                 dev_kfree_skb(skb);
 585         }
 586 }
 587
 588 /**********************************************************************************/
 589
 590 static int fs_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
 591 {
 592         struct fs_enet_private *fep = netdev_priv(dev);
 593         cbd_t *bdp;
 594         int curidx;
 595         u16 sc;
 596         unsigned long flags;
 597
 598         spin_lock_irqsave(&fep->tx_lock, flags);
 599
 600         /*
 601          * Fill in a Tx ring entry
 602          */
 603         bdp = fep->cur_tx;
 604
 605         if (!fep->tx_free || (CBDR_SC(bdp) & BD_ENET_TX_READY)) {
 606                 netif_stop_queue(dev);
 607                 spin_unlock_irqrestore(&fep->tx_lock, flags);
 608
 609                 /*
 610                  * Ooops.  All transmit buffers are full.  Bail out.
 611                  * This should not happen, since the tx queue should be stopped.
 612                  */
 613                 printk(KERN_WARNING DRV_MODULE_NAME
 614                        ": %s tx queue full!.\n", dev->name);
 615                 return NETDEV_TX_BUSY;
 616         }
 617
 618         curidx = bdp - fep->tx_bd_base;
 619         /*
 620          * Clear all of the status flags.
 621          */
 622         CBDC_SC(bdp, BD_ENET_TX_STATS);
 623
 624         /*
 625          * Save skb pointer.
 626          */
 627         fep->tx_skbuff[curidx] = skb;
 628
 629         fep->stats.tx_bytes += skb->len;
 630
 631         /*
 632          * Push the data cache so the CPM does not get stale memory data.
 633          */
 634         CBDW_BUFADDR(bdp, dma_map_single(fep->dev,
 635                                 skb->data, skb->len, DMA_TO_DEVICE));
 636         CBDW_DATLEN(bdp, skb->len);
 637
 638         dev->trans_start = jiffies;
 639
 640         /*
 641          * If this was the last BD in the ring, start at the beginning again.
 642          */
 643         if ((CBDR_SC(bdp) & BD_ENET_TX_WRAP) == 0)
 644                 fep->cur_tx++;
 645         else
 646                 fep->cur_tx = fep->tx_bd_base;
 647
 648         if (!--fep->tx_free)
 649                 netif_stop_queue(dev);
 650
 651         /* Trigger transmission start */
 652         sc = BD_ENET_TX_READY | BD_ENET_TX_INTR |
 653              BD_ENET_TX_LAST | BD_ENET_TX_TC;
 654
 655         /* note that while FEC does not have this bit
 656          * it marks it as available for software use
 657          * yay for hw reuse :) */
 658         if (skb->len <= 60)
 659                 sc |= BD_ENET_TX_PAD;
 660         CBDS_SC(bdp, sc);
 661
 662         (*fep->ops->tx_kickstart)(dev);
 663
 664         spin_unlock_irqrestore(&fep->tx_lock, flags);
 665
 666         return NETDEV_TX_OK;
 667 }
 668
 669 static int fs_request_irq(struct net_device *dev, int irq, const char *name,
 670                 irq_handler_t irqf)
 671 {
 672         struct fs_enet_private *fep = netdev_priv(dev);
 673
 674         (*fep->ops->pre_request_irq)(dev, irq);
 675         return request_irq(irq, irqf, IRQF_SHARED, name, dev);
 676 }
 677
 678 static void fs_free_irq(struct net_device *dev, int irq)
 679 {
 680         struct fs_enet_private *fep = netdev_priv(dev);
 681
 682         free_irq(irq, dev);
 683         (*fep->ops->post_free_irq)(dev, irq);
 684 }
 685
 686 static void fs_timeout(struct net_device *dev)
 687 {
 688         struct fs_enet_private *fep = netdev_priv(dev);
 689         unsigned long flags;
 690         int wake = 0;
 691
 692         fep->stats.tx_errors++;
 693
 694         spin_lock_irqsave(&fep->lock, flags);
 695
 696         if (dev->flags & IFF_UP) {
 697                 phy_stop(fep->phydev);
 698                 (*fep->ops->stop)(dev);
 699                 (*fep->ops->restart)(dev);
 700                 phy_start(fep->phydev);
 701         }
 702
 703         phy_start(fep->phydev);
 704         wake = fep->tx_free && !(CBDR_SC(fep->cur_tx) & BD_ENET_TX_READY);
 705         spin_unlock_irqrestore(&fep->lock, flags);
 706
 707         if (wake)
 708                 netif_wake_queue(dev);
 709 }
 710
 711 /*-----------------------------------------------------------------------------
 712  *  generic link-change handler - should be sufficient for most cases
 713  *-----------------------------------------------------------------------------*/
 714 static void generic_adjust_link(struct  net_device *dev)
 715 {
 716        struct fs_enet_private *fep = netdev_priv(dev);
 717        struct phy_device *phydev = fep->phydev;
 718        int new_state = 0;
 719
 720        if (phydev->link) {
 721
 722                /* adjust to duplex mode */
 723                if (phydev->duplex != fep->oldduplex){
 724                        new_state = 1;
 725                        fep->oldduplex = phydev->duplex;
 726                }
 727
 728                if (phydev->speed != fep->oldspeed) {
 729                        new_state = 1;
 730                        fep->oldspeed = phydev->speed;
 731                }
 732
 733                if (!fep->oldlink) {
 734                        new_state = 1;
 735                        fep->oldlink = 1;
 736                        netif_schedule(dev);
 737                        netif_carrier_on(dev);
 738                        netif_start_queue(dev);
 739                }
 740
 741                if (new_state)
 742                        fep->ops->restart(dev);
 743
 744        } else if (fep->oldlink) {
 745                new_state = 1;
 746                fep->oldlink = 0;
 747                fep->oldspeed = 0;
 748                fep->oldduplex = -1;
 749                netif_carrier_off(dev);
 750                netif_stop_queue(dev);
 751        }
 752
 753        if (new_state && netif_msg_link(fep))
 754                phy_print_status(phydev);
 755 }
 756
 757
 758 static void fs_adjust_link(struct net_device *dev)
 759 {
 760         struct fs_enet_private *fep = netdev_priv(dev);
 761         unsigned long flags;
 762
 763         spin_lock_irqsave(&fep->lock, flags);
 764
 765         if(fep->ops->adjust_link)
 766                 fep->ops->adjust_link(dev);
 767         else
 768                 generic_adjust_link(dev);
 769
 770         spin_unlock_irqrestore(&fep->lock, flags);
 771 }
 772
 773 static int fs_init_phy(struct net_device *dev)
 774 {
 775         struct fs_enet_private *fep = netdev_priv(dev);
 776         struct phy_device *phydev;
 777
 778         fep->oldlink = 0;
 779         fep->oldspeed = 0;
 780         fep->oldduplex = -1;
 781         if(fep->fpi->bus_id)
 782                 phydev = phy_connect(dev, fep->fpi->bus_id, &fs_adjust_link, 0,
 783                                 PHY_INTERFACE_MODE_MII);
 784         else {
 785                 printk("No phy bus ID specified in BSP code\n");
 786                 return -EINVAL;
 787         }
 788         if (IS_ERR(phydev)) {
 789                 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
 790                 return PTR_ERR(phydev);
 791         }
 792
 793         fep->phydev = phydev;
 794
 795         return 0;
 796 }
 797
 798
 799 static int fs_enet_open(struct net_device *dev)
 800 {
 801         struct fs_enet_private *fep = netdev_priv(dev);
 802         int r;
 803         int err;
 804
 805         /* Install our interrupt handler. */
 806         r = fs_request_irq(dev, fep->interrupt, "fs_enet-mac", fs_enet_interrupt);
 807         if (r != 0) {
 808                 printk(KERN_ERR DRV_MODULE_NAME
 809                        ": %s Could not allocate FS_ENET IRQ!", dev->name);
 810                 return -EINVAL;
 811         }
 812
 813         err = fs_init_phy(dev);
 814         if(err)
 815                 return err;
 816
 817         phy_start(fep->phydev);
 818
 819         return 0;
 820 }
 821
 822 static int fs_enet_close(struct net_device *dev)
 823 {
 824         struct fs_enet_private *fep = netdev_priv(dev);
 825         unsigned long flags;
 826
 827         netif_stop_queue(dev);
 828         netif_carrier_off(dev);
 829         phy_stop(fep->phydev);
 830
 831         spin_lock_irqsave(&fep->lock, flags);
 832         (*fep->ops->stop)(dev);
 833         spin_unlock_irqrestore(&fep->lock, flags);
 834
 835         /* release any irqs */
 836         phy_disconnect(fep->phydev);
 837         fep->phydev = NULL;
 838         fs_free_irq(dev, fep->interrupt);
 839
 840         return 0;
 841 }
 842
 843 static struct net_device_stats *fs_enet_get_stats(struct net_device *dev)
 844 {
 845         struct fs_enet_private *fep = netdev_priv(dev);
 846         return &fep->stats;
 847 }
 848
 849 /*************************************************************************/
 850
 851 static void fs_get_drvinfo(struct net_device *dev,
 852                             struct ethtool_drvinfo *info)
 853 {
 854         strcpy(info->driver, DRV_MODULE_NAME);
 855         strcpy(info->version, DRV_MODULE_VERSION);
 856 }
 857
 858 static int fs_get_regs_len(struct net_device *dev)
 859 {
 860         struct fs_enet_private *fep = netdev_priv(dev);
 861
 862         return (*fep->ops->get_regs_len)(dev);
 863 }
 864
 865 static void fs_get_regs(struct net_device *dev, struct ethtool_regs *regs,
 866                          void *p)
 867 {
 868         struct fs_enet_private *fep = netdev_priv(dev);
 869         unsigned long flags;
 870         int r, len;
 871
 872         len = regs->len;
 873
 874         spin_lock_irqsave(&fep->lock, flags);
 875         r = (*fep->ops->get_regs)(dev, p, &len);
 876         spin_unlock_irqrestore(&fep->lock, flags);
 877
 878         if (r == 0)
 879                 regs->version = 0;
 880 }
 881
 882 static int fs_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 883 {
 884         struct fs_enet_private *fep = netdev_priv(dev);
 885         return phy_ethtool_gset(fep->phydev, cmd);
 886 }
 887
 888 static int fs_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 889 {
 890         struct fs_enet_private *fep = netdev_priv(dev);
 891         phy_ethtool_sset(fep->phydev, cmd);
 892         return 0;
 893 }
 894
 895 static int fs_nway_reset(struct net_device *dev)
 896 {
 897         return 0;
 898 }
 899
 900 static u32 fs_get_msglevel(struct net_device *dev)
 901 {
 902         struct fs_enet_private *fep = netdev_priv(dev);
 903         return fep->msg_enable;
 904 }
 905
 906 static void fs_set_msglevel(struct net_device *dev, u32 value)
 907 {
 908         struct fs_enet_private *fep = netdev_priv(dev);
 909         fep->msg_enable = value;
 910 }
 911
 912 static const struct ethtool_ops fs_ethtool_ops = {
 913         .get_drvinfo = fs_get_drvinfo,
 914         .get_regs_len = fs_get_regs_len,
 915         .get_settings = fs_get_settings,
 916         .set_settings = fs_set_settings,
 917         .nway_reset = fs_nway_reset,
 918         .get_link = ethtool_op_get_link,
 919         .get_msglevel = fs_get_msglevel,
 920         .set_msglevel = fs_set_msglevel,
 921         .get_tx_csum = ethtool_op_get_tx_csum,
 922         .set_tx_csum = ethtool_op_set_tx_csum,  /* local! */
 923         .get_sg = ethtool_op_get_sg,
 924         .set_sg = ethtool_op_set_sg,
 925         .get_regs = fs_get_regs,
 926 };
 927
 928 static int fs_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 929 {
 930         struct fs_enet_private *fep = netdev_priv(dev);
 931         struct mii_ioctl_data *mii = (struct mii_ioctl_data *)&rq->ifr_data;
 932         unsigned long flags;
 933         int rc;
 934
 935         if (!netif_running(dev))
 936                 return -EINVAL;
 937
 938         spin_lock_irqsave(&fep->lock, flags);
 939         rc = phy_mii_ioctl(fep->phydev, mii, cmd);
 940         spin_unlock_irqrestore(&fep->lock, flags);
 941         return rc;
 942 }
 943
 944 extern int fs_mii_connect(struct net_device *dev);
 945 extern void fs_mii_disconnect(struct net_device *dev);
 946
 947 static struct net_device *fs_init_instance(struct device *dev,
 948                 struct fs_platform_info *fpi)
 949 {
 950         struct net_device *ndev = NULL;
 951         struct fs_enet_private *fep = NULL;
 952         int privsize, i, r, err = 0, registered = 0;
 953
 954         fpi->fs_no = fs_get_id(fpi);
 955         /* guard */
 956         if ((unsigned int)fpi->fs_no >= FS_MAX_INDEX)
 957                 return ERR_PTR(-EINVAL);
 958
 959         privsize = sizeof(*fep) + (sizeof(struct sk_buff **) *
 960                             (fpi->rx_ring + fpi->tx_ring));
 961
 962         ndev = alloc_etherdev(privsize);
 963         if (!ndev) {
 964                 err = -ENOMEM;
 965                 goto err;
 966         }
 967         SET_MODULE_OWNER(ndev);
 968
 969         fep = netdev_priv(ndev);
 970         memset(fep, 0, privsize);       /* clear everything */
 971
 972         fep->dev = dev;
 973         dev_set_drvdata(dev, ndev);
 974         fep->fpi = fpi;
 975         if (fpi->init_ioports)
 976                 fpi->init_ioports((struct fs_platform_info *)fpi);
 977
 978 #ifdef CONFIG_FS_ENET_HAS_FEC
 979         if (fs_get_fec_index(fpi->fs_no) >= 0)
 980                 fep->ops = &fs_fec_ops;
 981 #endif
 982
 983 #ifdef CONFIG_FS_ENET_HAS_SCC
 984         if (fs_get_scc_index(fpi->fs_no) >=0 )
 985                 fep->ops = &fs_scc_ops;
 986 #endif
 987
 988 #ifdef CONFIG_FS_ENET_HAS_FCC
 989         if (fs_get_fcc_index(fpi->fs_no) >= 0)
 990                 fep->ops = &fs_fcc_ops;
 991 #endif
 992
 993         if (fep->ops == NULL) {
 994                 printk(KERN_ERR DRV_MODULE_NAME
 995                        ": %s No matching ops found (%d).\n",
 996                        ndev->name, fpi->fs_no);
 997                 err = -EINVAL;
 998                 goto err;
 999         }
1000
1001         r = (*fep->ops->setup_data)(ndev);
1002         if (r != 0) {
1003                 printk(KERN_ERR DRV_MODULE_NAME
1004                        ": %s setup_data failed\n",
1005                         ndev->name);
1006                 err = r;
1007                 goto err;
1008         }
1009
1010         /* point rx_skbuff, tx_skbuff */
1011         fep->rx_skbuff = (struct sk_buff **)&fep[1];
1012         fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;
1013
1014         /* init locks */
1015         spin_lock_init(&fep->lock);
1016         spin_lock_init(&fep->tx_lock);
1017
1018         /*
1019          * Set the Ethernet address.
1020          */
1021         for (i = 0; i < 6; i++)
1022                 ndev->dev_addr[i] = fpi->macaddr[i];
1023
1024         r = (*fep->ops->allocate_bd)(ndev);
1025
1026         if (fep->ring_base == NULL) {
1027                 printk(KERN_ERR DRV_MODULE_NAME
1028                        ": %s buffer descriptor alloc failed (%d).\n", ndev->name, r);
1029                 err = r;
1030                 goto err;
1031         }
1032
1033         /*
1034          * Set receive and transmit descriptor base.
1035          */
1036         fep->rx_bd_base = fep->ring_base;
1037         fep->tx_bd_base = fep->rx_bd_base + fpi->rx_ring;
1038
1039         /* initialize ring size variables */
1040         fep->tx_ring = fpi->tx_ring;
1041         fep->rx_ring = fpi->rx_ring;
1042
1043         /*
1044          * The FEC Ethernet specific entries in the device structure.
1045          */
1046         ndev->open = fs_enet_open;
1047         ndev->hard_start_xmit = fs_enet_start_xmit;
1048         ndev->tx_timeout = fs_timeout;
1049         ndev->watchdog_timeo = 2 * HZ;
1050         ndev->stop = fs_enet_close;
1051         ndev->get_stats = fs_enet_get_stats;
1052         ndev->set_multicast_list = fs_set_multicast_list;
1053         if (fpi->use_napi) {
1054                 ndev->poll = fs_enet_rx_napi;
1055                 ndev->weight = fpi->napi_weight;
1056         }
1057         ndev->ethtool_ops = &fs_ethtool_ops;
1058         ndev->do_ioctl = fs_ioctl;
1059
1060         init_timer(&fep->phy_timer_list);
1061
1062         netif_carrier_off(ndev);
1063
1064         err = register_netdev(ndev);
1065         if (err != 0) {
1066                 printk(KERN_ERR DRV_MODULE_NAME
1067                        ": %s register_netdev failed.\n", ndev->name);
1068                 goto err;
1069         }
1070         registered = 1;
1071
1072
1073         return ndev;
1074
1075       err:
1076         if (ndev != NULL) {
1077
1078                 if (registered)
1079                         unregister_netdev(ndev);
1080
1081                 if (fep != NULL) {
1082                         (*fep->ops->free_bd)(ndev);
1083                         (*fep->ops->cleanup_data)(ndev);
1084                 }
1085
1086                 free_netdev(ndev);
1087         }
1088
1089         dev_set_drvdata(dev, NULL);
1090
1091         return ERR_PTR(err);
1092 }
1093
1094 static int fs_cleanup_instance(struct net_device *ndev)
1095 {
1096         struct fs_enet_private *fep;
1097         const struct fs_platform_info *fpi;
1098         struct device *dev;
1099
1100         if (ndev == NULL)
1101                 return -EINVAL;
1102
1103         fep = netdev_priv(ndev);
1104         if (fep == NULL)
1105                 return -EINVAL;
1106
1107         fpi = fep->fpi;
1108
1109         unregister_netdev(ndev);
1110
1111         dma_free_coherent(fep->dev, (fpi->tx_ring + fpi->rx_ring) * sizeof(cbd_t),
1112                           fep->ring_base, fep->ring_mem_addr);
1113
1114         /* reset it */
1115         (*fep->ops->cleanup_data)(ndev);
1116
1117         dev = fep->dev;
1118         if (dev != NULL) {
1119                 dev_set_drvdata(dev, NULL);
1120                 fep->dev = NULL;
1121         }
1122
1123         free_netdev(ndev);
1124
1125         return 0;
1126 }
1127
1128 /**************************************************************************************/
1129
1130 /* handy pointer to the immap */
1131 void *fs_enet_immap = NULL;
1132
1133 static int setup_immap(void)
1134 {
1135         phys_addr_t paddr = 0;
1136         unsigned long size = 0;
1137
1138 #ifdef CONFIG_CPM1
1139         paddr = IMAP_ADDR;
1140         size = 0x10000; /* map 64K */
1141 #endif
1142
1143 #ifdef CONFIG_CPM2
1144         paddr = CPM_MAP_ADDR;
1145         size = 0x40000; /* map 256 K */
1146 #endif
1147         fs_enet_immap = ioremap(paddr, size);
1148         if (fs_enet_immap == NULL)
1149                 return -EBADF;  /* XXX ahem; maybe just BUG_ON? */
1150
1151         return 0;
1152 }
1153
1154 static void cleanup_immap(void)
1155 {
1156         if (fs_enet_immap != NULL) {
1157                 iounmap(fs_enet_immap);
1158                 fs_enet_immap = NULL;
1159         }
1160 }
1161
1162 /**************************************************************************************/
1163
1164 static int __devinit fs_enet_probe(struct device *dev)
1165 {
1166         struct net_device *ndev;
1167
1168         /* no fixup - no device */
1169         if (dev->platform_data == NULL) {
1170                 printk(KERN_INFO "fs_enet: "
1171                                 "probe called with no platform data; "
1172                                 "remove unused devices\n");
1173                 return -ENODEV;
1174         }
1175
1176         ndev = fs_init_instance(dev, dev->platform_data);
1177         if (IS_ERR(ndev))
1178                 return PTR_ERR(ndev);
1179         return 0;
1180 }
1181
1182 static int fs_enet_remove(struct device *dev)
1183 {
1184         return fs_cleanup_instance(dev_get_drvdata(dev));
1185 }
1186
1187 static struct device_driver fs_enet_fec_driver = {
1188         .name           = "fsl-cpm-fec",
1189         .bus            = &platform_bus_type,
1190         .probe          = fs_enet_probe,
1191         .remove         = fs_enet_remove,
1192 #ifdef CONFIG_PM
1193 /*      .suspend        = fs_enet_suspend,      TODO */
1194 /*      .resume         = fs_enet_resume,       TODO */
1195 #endif
1196 };
1197
1198 static struct device_driver fs_enet_scc_driver = {
1199         .name           = "fsl-cpm-scc",
1200         .bus            = &platform_bus_type,
1201         .probe          = fs_enet_probe,
1202         .remove         = fs_enet_remove,
1203 #ifdef CONFIG_PM
1204 /*      .suspend        = fs_enet_suspend,      TODO */
1205 /*      .resume         = fs_enet_resume,       TODO */
1206 #endif
1207 };
1208
1209 static struct device_driver fs_enet_fcc_driver = {
1210         .name           = "fsl-cpm-fcc",
1211         .bus            = &platform_bus_type,
1212         .probe          = fs_enet_probe,
1213         .remove         = fs_enet_remove,
1214 #ifdef CONFIG_PM
1215 /*      .suspend        = fs_enet_suspend,      TODO */
1216 /*      .resume         = fs_enet_resume,       TODO */
1217 #endif
1218 };
1219
1220 static int __init fs_init(void)
1221 {
1222         int r;
1223
1224         printk(KERN_INFO
1225                         "%s", version);
1226
1227         r = setup_immap();
1228         if (r != 0)
1229                 return r;
1230
1231 #ifdef CONFIG_FS_ENET_HAS_FCC
1232         /* let's insert mii stuff */
1233         r = fs_enet_mdio_bb_init();
1234
1235         if (r != 0) {
1236                 printk(KERN_ERR DRV_MODULE_NAME
1237                         "BB PHY init failed.\n");
1238                 return r;
1239         }
1240         r = driver_register(&fs_enet_fcc_driver);
1241         if (r != 0)
1242                 goto err;
1243 #endif
1244
1245 #ifdef CONFIG_FS_ENET_HAS_FEC
1246         r =  fs_enet_mdio_fec_init();
1247         if (r != 0) {
1248                 printk(KERN_ERR DRV_MODULE_NAME
1249                         "FEC PHY init failed.\n");
1250                 return r;
1251         }
1252
1253         r = driver_register(&fs_enet_fec_driver);
1254         if (r != 0)
1255                 goto err;
1256 #endif
1257
1258 #ifdef CONFIG_FS_ENET_HAS_SCC
1259         r = driver_register(&fs_enet_scc_driver);
1260         if (r != 0)
1261                 goto err;
1262 #endif
1263
1264         return 0;
1265 err:
1266         cleanup_immap();
1267         return r;
1268
1269 }
1270
1271 static void __exit fs_cleanup(void)
1272 {
1273         driver_unregister(&fs_enet_fec_driver);
1274         driver_unregister(&fs_enet_fcc_driver);
1275         driver_unregister(&fs_enet_scc_driver);
1276         cleanup_immap();
1277 }
1278
1279 /**************************************************************************************/
1280
1281 module_init(fs_init);
1282 module_exit(fs_cleanup);