git.oblomov.eu Git - linux-2.6/blob - 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                                         skb_copy_from_linear_data(skb,
 164                                                       skbn->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_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                                         skb_copy_from_linear_data(skb,
 298                                                       skbn->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_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                 CBDW_BUFADDR(bdp,
 520                         dma_map_single(fep->dev, skb->data,
 521                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 522                                 DMA_FROM_DEVICE));
 523                 CBDW_DATLEN(bdp, 0);    /* zero */
 524                 CBDW_SC(bdp, BD_ENET_RX_EMPTY |
 525                         ((i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP));
 526         }
 527         /*
 528          * if we failed, fillup remainder
 529          */
 530         for (; i < fep->rx_ring; i++, bdp++) {
 531                 fep->rx_skbuff[i] = NULL;
 532                 CBDW_SC(bdp, (i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP);
 533         }
 534
 535         /*
 536          * ...and the same for transmit.
 537          */
 538         for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
 539                 fep->tx_skbuff[i] = NULL;
 540                 CBDW_BUFADDR(bdp, 0);
 541                 CBDW_DATLEN(bdp, 0);
 542                 CBDW_SC(bdp, (i < fep->tx_ring - 1) ? 0 : BD_SC_WRAP);
 543         }
 544 }
 545
 546 void fs_cleanup_bds(struct net_device *dev)
 547 {
 548         struct fs_enet_private *fep = netdev_priv(dev);
 549         struct sk_buff *skb;
 550         cbd_t *bdp;
 551         int i;
 552
 553         /*
 554          * Reset SKB transmit buffers.
 555          */
 556         for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
 557                 if ((skb = fep->tx_skbuff[i]) == NULL)
 558                         continue;
 559
 560                 /* unmap */
 561                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 562                                 skb->len, DMA_TO_DEVICE);
 563
 564                 fep->tx_skbuff[i] = NULL;
 565                 dev_kfree_skb(skb);
 566         }
 567
 568         /*
 569          * Reset SKB receive buffers
 570          */
 571         for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
 572                 if ((skb = fep->rx_skbuff[i]) == NULL)
 573                         continue;
 574
 575                 /* unmap */
 576                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 577                         L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 578                         DMA_FROM_DEVICE);
 579
 580                 fep->rx_skbuff[i] = NULL;
 581
 582                 dev_kfree_skb(skb);
 583         }
 584 }
 585
 586 /**********************************************************************************/
 587
 588 static int fs_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
 589 {
 590         struct fs_enet_private *fep = netdev_priv(dev);
 591         cbd_t *bdp;
 592         int curidx;
 593         u16 sc;
 594         unsigned long flags;
 595
 596         spin_lock_irqsave(&fep->tx_lock, flags);
 597
 598         /*
 599          * Fill in a Tx ring entry
 600          */
 601         bdp = fep->cur_tx;
 602
 603         if (!fep->tx_free || (CBDR_SC(bdp) & BD_ENET_TX_READY)) {
 604                 netif_stop_queue(dev);
 605                 spin_unlock_irqrestore(&fep->tx_lock, flags);
 606
 607                 /*
 608                  * Ooops.  All transmit buffers are full.  Bail out.
 609                  * This should not happen, since the tx queue should be stopped.
 610                  */
 611                 printk(KERN_WARNING DRV_MODULE_NAME
 612                        ": %s tx queue full!.\n", dev->name);
 613                 return NETDEV_TX_BUSY;
 614         }
 615
 616         curidx = bdp - fep->tx_bd_base;
 617         /*
 618          * Clear all of the status flags.
 619          */
 620         CBDC_SC(bdp, BD_ENET_TX_STATS);
 621
 622         /*
 623          * Save skb pointer.
 624          */
 625         fep->tx_skbuff[curidx] = skb;
 626
 627         fep->stats.tx_bytes += skb->len;
 628
 629         /*
 630          * Push the data cache so the CPM does not get stale memory data.
 631          */
 632         CBDW_BUFADDR(bdp, dma_map_single(fep->dev,
 633                                 skb->data, skb->len, DMA_TO_DEVICE));
 634         CBDW_DATLEN(bdp, skb->len);
 635
 636         dev->trans_start = jiffies;
 637
 638         /*
 639          * If this was the last BD in the ring, start at the beginning again.
 640          */
 641         if ((CBDR_SC(bdp) & BD_ENET_TX_WRAP) == 0)
 642                 fep->cur_tx++;
 643         else
 644                 fep->cur_tx = fep->tx_bd_base;
 645
 646         if (!--fep->tx_free)
 647                 netif_stop_queue(dev);
 648
 649         /* Trigger transmission start */
 650         sc = BD_ENET_TX_READY | BD_ENET_TX_INTR |
 651              BD_ENET_TX_LAST | BD_ENET_TX_TC;
 652
 653         /* note that while FEC does not have this bit
 654          * it marks it as available for software use
 655          * yay for hw reuse :) */
 656         if (skb->len <= 60)
 657                 sc |= BD_ENET_TX_PAD;
 658         CBDS_SC(bdp, sc);
 659
 660         (*fep->ops->tx_kickstart)(dev);
 661
 662         spin_unlock_irqrestore(&fep->tx_lock, flags);
 663
 664         return NETDEV_TX_OK;
 665 }
 666
 667 static int fs_request_irq(struct net_device *dev, int irq, const char *name,
 668                 irq_handler_t irqf)
 669 {
 670         struct fs_enet_private *fep = netdev_priv(dev);
 671
 672         (*fep->ops->pre_request_irq)(dev, irq);
 673         return request_irq(irq, irqf, IRQF_SHARED, name, dev);
 674 }
 675
 676 static void fs_free_irq(struct net_device *dev, int irq)
 677 {
 678         struct fs_enet_private *fep = netdev_priv(dev);
 679
 680         free_irq(irq, dev);
 681         (*fep->ops->post_free_irq)(dev, irq);
 682 }
 683
 684 static void fs_timeout(struct net_device *dev)
 685 {
 686         struct fs_enet_private *fep = netdev_priv(dev);
 687         unsigned long flags;
 688         int wake = 0;
 689
 690         fep->stats.tx_errors++;
 691
 692         spin_lock_irqsave(&fep->lock, flags);
 693
 694         if (dev->flags & IFF_UP) {
 695                 phy_stop(fep->phydev);
 696                 (*fep->ops->stop)(dev);
 697                 (*fep->ops->restart)(dev);
 698                 phy_start(fep->phydev);
 699         }
 700
 701         phy_start(fep->phydev);
 702         wake = fep->tx_free && !(CBDR_SC(fep->cur_tx) & BD_ENET_TX_READY);
 703         spin_unlock_irqrestore(&fep->lock, flags);
 704
 705         if (wake)
 706                 netif_wake_queue(dev);
 707 }
 708
 709 /*-----------------------------------------------------------------------------
 710  *  generic link-change handler - should be sufficient for most cases
 711  *-----------------------------------------------------------------------------*/
 712 static void generic_adjust_link(struct  net_device *dev)
 713 {
 714        struct fs_enet_private *fep = netdev_priv(dev);
 715        struct phy_device *phydev = fep->phydev;
 716        int new_state = 0;
 717
 718        if (phydev->link) {
 719
 720                /* adjust to duplex mode */
 721                if (phydev->duplex != fep->oldduplex){
 722                        new_state = 1;
 723                        fep->oldduplex = phydev->duplex;
 724                }
 725
 726                if (phydev->speed != fep->oldspeed) {
 727                        new_state = 1;
 728                        fep->oldspeed = phydev->speed;
 729                }
 730
 731                if (!fep->oldlink) {
 732                        new_state = 1;
 733                        fep->oldlink = 1;
 734                        netif_schedule(dev);
 735                        netif_carrier_on(dev);
 736                        netif_start_queue(dev);
 737                }
 738
 739                if (new_state)
 740                        fep->ops->restart(dev);
 741
 742        } else if (fep->oldlink) {
 743                new_state = 1;
 744                fep->oldlink = 0;
 745                fep->oldspeed = 0;
 746                fep->oldduplex = -1;
 747                netif_carrier_off(dev);
 748                netif_stop_queue(dev);
 749        }
 750
 751        if (new_state && netif_msg_link(fep))
 752                phy_print_status(phydev);
 753 }
 754
 755
 756 static void fs_adjust_link(struct net_device *dev)
 757 {
 758         struct fs_enet_private *fep = netdev_priv(dev);
 759         unsigned long flags;
 760
 761         spin_lock_irqsave(&fep->lock, flags);
 762
 763         if(fep->ops->adjust_link)
 764                 fep->ops->adjust_link(dev);
 765         else
 766                 generic_adjust_link(dev);
 767
 768         spin_unlock_irqrestore(&fep->lock, flags);
 769 }
 770
 771 static int fs_init_phy(struct net_device *dev)
 772 {
 773         struct fs_enet_private *fep = netdev_priv(dev);
 774         struct phy_device *phydev;
 775
 776         fep->oldlink = 0;
 777         fep->oldspeed = 0;
 778         fep->oldduplex = -1;
 779         if(fep->fpi->bus_id)
 780                 phydev = phy_connect(dev, fep->fpi->bus_id, &fs_adjust_link, 0,
 781                                 PHY_INTERFACE_MODE_MII);
 782         else {
 783                 printk("No phy bus ID specified in BSP code\n");
 784                 return -EINVAL;
 785         }
 786         if (IS_ERR(phydev)) {
 787                 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
 788                 return PTR_ERR(phydev);
 789         }
 790
 791         fep->phydev = phydev;
 792
 793         return 0;
 794 }
 795
 796
 797 static int fs_enet_open(struct net_device *dev)
 798 {
 799         struct fs_enet_private *fep = netdev_priv(dev);
 800         int r;
 801         int err;
 802
 803         /* Install our interrupt handler. */
 804         r = fs_request_irq(dev, fep->interrupt, "fs_enet-mac", fs_enet_interrupt);
 805         if (r != 0) {
 806                 printk(KERN_ERR DRV_MODULE_NAME
 807                        ": %s Could not allocate FS_ENET IRQ!", dev->name);
 808                 return -EINVAL;
 809         }
 810
 811         err = fs_init_phy(dev);
 812         if(err)
 813                 return err;
 814
 815         phy_start(fep->phydev);
 816
 817         return 0;
 818 }
 819
 820 static int fs_enet_close(struct net_device *dev)
 821 {
 822         struct fs_enet_private *fep = netdev_priv(dev);
 823         unsigned long flags;
 824
 825         netif_stop_queue(dev);
 826         netif_carrier_off(dev);
 827         phy_stop(fep->phydev);
 828
 829         spin_lock_irqsave(&fep->lock, flags);
 830         (*fep->ops->stop)(dev);
 831         spin_unlock_irqrestore(&fep->lock, flags);
 832
 833         /* release any irqs */
 834         phy_disconnect(fep->phydev);
 835         fep->phydev = NULL;
 836         fs_free_irq(dev, fep->interrupt);
 837
 838         return 0;
 839 }
 840
 841 static struct net_device_stats *fs_enet_get_stats(struct net_device *dev)
 842 {
 843         struct fs_enet_private *fep = netdev_priv(dev);
 844         return &fep->stats;
 845 }
 846
 847 /*************************************************************************/
 848
 849 static void fs_get_drvinfo(struct net_device *dev,
 850                             struct ethtool_drvinfo *info)
 851 {
 852         strcpy(info->driver, DRV_MODULE_NAME);
 853         strcpy(info->version, DRV_MODULE_VERSION);
 854 }
 855
 856 static int fs_get_regs_len(struct net_device *dev)
 857 {
 858         struct fs_enet_private *fep = netdev_priv(dev);
 859
 860         return (*fep->ops->get_regs_len)(dev);
 861 }
 862
 863 static void fs_get_regs(struct net_device *dev, struct ethtool_regs *regs,
 864                          void *p)
 865 {
 866         struct fs_enet_private *fep = netdev_priv(dev);
 867         unsigned long flags;
 868         int r, len;
 869
 870         len = regs->len;
 871
 872         spin_lock_irqsave(&fep->lock, flags);
 873         r = (*fep->ops->get_regs)(dev, p, &len);
 874         spin_unlock_irqrestore(&fep->lock, flags);
 875
 876         if (r == 0)
 877                 regs->version = 0;
 878 }
 879
 880 static int fs_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 881 {
 882         struct fs_enet_private *fep = netdev_priv(dev);
 883         return phy_ethtool_gset(fep->phydev, cmd);
 884 }
 885
 886 static int fs_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 887 {
 888         struct fs_enet_private *fep = netdev_priv(dev);
 889         phy_ethtool_sset(fep->phydev, cmd);
 890         return 0;
 891 }
 892
 893 static int fs_nway_reset(struct net_device *dev)
 894 {
 895         return 0;
 896 }
 897
 898 static u32 fs_get_msglevel(struct net_device *dev)
 899 {
 900         struct fs_enet_private *fep = netdev_priv(dev);
 901         return fep->msg_enable;
 902 }
 903
 904 static void fs_set_msglevel(struct net_device *dev, u32 value)
 905 {
 906         struct fs_enet_private *fep = netdev_priv(dev);
 907         fep->msg_enable = value;
 908 }
 909
 910 static const struct ethtool_ops fs_ethtool_ops = {
 911         .get_drvinfo = fs_get_drvinfo,
 912         .get_regs_len = fs_get_regs_len,
 913         .get_settings = fs_get_settings,
 914         .set_settings = fs_set_settings,
 915         .nway_reset = fs_nway_reset,
 916         .get_link = ethtool_op_get_link,
 917         .get_msglevel = fs_get_msglevel,
 918         .set_msglevel = fs_set_msglevel,
 919         .get_tx_csum = ethtool_op_get_tx_csum,
 920         .set_tx_csum = ethtool_op_set_tx_csum,  /* local! */
 921         .get_sg = ethtool_op_get_sg,
 922         .set_sg = ethtool_op_set_sg,
 923         .get_regs = fs_get_regs,
 924 };
 925
 926 static int fs_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 927 {
 928         struct fs_enet_private *fep = netdev_priv(dev);
 929         struct mii_ioctl_data *mii = (struct mii_ioctl_data *)&rq->ifr_data;
 930         unsigned long flags;
 931         int rc;
 932
 933         if (!netif_running(dev))
 934                 return -EINVAL;
 935
 936         spin_lock_irqsave(&fep->lock, flags);
 937         rc = phy_mii_ioctl(fep->phydev, mii, cmd);
 938         spin_unlock_irqrestore(&fep->lock, flags);
 939         return rc;
 940 }
 941
 942 extern int fs_mii_connect(struct net_device *dev);
 943 extern void fs_mii_disconnect(struct net_device *dev);
 944
 945 static struct net_device *fs_init_instance(struct device *dev,
 946                 struct fs_platform_info *fpi)
 947 {
 948         struct net_device *ndev = NULL;
 949         struct fs_enet_private *fep = NULL;
 950         int privsize, i, r, err = 0, registered = 0;
 951
 952         fpi->fs_no = fs_get_id(fpi);
 953         /* guard */
 954         if ((unsigned int)fpi->fs_no >= FS_MAX_INDEX)
 955                 return ERR_PTR(-EINVAL);
 956
 957         privsize = sizeof(*fep) + (sizeof(struct sk_buff **) *
 958                             (fpi->rx_ring + fpi->tx_ring));
 959
 960         ndev = alloc_etherdev(privsize);
 961         if (!ndev) {
 962                 err = -ENOMEM;
 963                 goto err;
 964         }
 965         SET_MODULE_OWNER(ndev);
 966
 967         fep = netdev_priv(ndev);
 968         memset(fep, 0, privsize);       /* clear everything */
 969
 970         fep->dev = dev;
 971         dev_set_drvdata(dev, ndev);
 972         fep->fpi = fpi;
 973         if (fpi->init_ioports)
 974                 fpi->init_ioports((struct fs_platform_info *)fpi);
 975
 976 #ifdef CONFIG_FS_ENET_HAS_FEC
 977         if (fs_get_fec_index(fpi->fs_no) >= 0)
 978                 fep->ops = &fs_fec_ops;
 979 #endif
 980
 981 #ifdef CONFIG_FS_ENET_HAS_SCC
 982         if (fs_get_scc_index(fpi->fs_no) >=0 )
 983                 fep->ops = &fs_scc_ops;
 984 #endif
 985
 986 #ifdef CONFIG_FS_ENET_HAS_FCC
 987         if (fs_get_fcc_index(fpi->fs_no) >= 0)
 988                 fep->ops = &fs_fcc_ops;
 989 #endif
 990
 991         if (fep->ops == NULL) {
 992                 printk(KERN_ERR DRV_MODULE_NAME
 993                        ": %s No matching ops found (%d).\n",
 994                        ndev->name, fpi->fs_no);
 995                 err = -EINVAL;
 996                 goto err;
 997         }
 998
 999         r = (*fep->ops->setup_data)(ndev);
1000         if (r != 0) {
1001                 printk(KERN_ERR DRV_MODULE_NAME
1002                        ": %s setup_data failed\n",
1003                         ndev->name);
1004                 err = r;
1005                 goto err;
1006         }
1007
1008         /* point rx_skbuff, tx_skbuff */
1009         fep->rx_skbuff = (struct sk_buff **)&fep[1];
1010         fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;
1011
1012         /* init locks */
1013         spin_lock_init(&fep->lock);
1014         spin_lock_init(&fep->tx_lock);
1015
1016         /*
1017          * Set the Ethernet address.
1018          */
1019         for (i = 0; i < 6; i++)
1020                 ndev->dev_addr[i] = fpi->macaddr[i];
1021
1022         r = (*fep->ops->allocate_bd)(ndev);
1023
1024         if (fep->ring_base == NULL) {
1025                 printk(KERN_ERR DRV_MODULE_NAME
1026                        ": %s buffer descriptor alloc failed (%d).\n", ndev->name, r);
1027                 err = r;
1028                 goto err;
1029         }
1030
1031         /*
1032          * Set receive and transmit descriptor base.
1033          */
1034         fep->rx_bd_base = fep->ring_base;
1035         fep->tx_bd_base = fep->rx_bd_base + fpi->rx_ring;
1036
1037         /* initialize ring size variables */
1038         fep->tx_ring = fpi->tx_ring;
1039         fep->rx_ring = fpi->rx_ring;
1040
1041         /*
1042          * The FEC Ethernet specific entries in the device structure.
1043          */
1044         ndev->open = fs_enet_open;
1045         ndev->hard_start_xmit = fs_enet_start_xmit;
1046         ndev->tx_timeout = fs_timeout;
1047         ndev->watchdog_timeo = 2 * HZ;
1048         ndev->stop = fs_enet_close;
1049         ndev->get_stats = fs_enet_get_stats;
1050         ndev->set_multicast_list = fs_set_multicast_list;
1051         if (fpi->use_napi) {
1052                 ndev->poll = fs_enet_rx_napi;
1053                 ndev->weight = fpi->napi_weight;
1054         }
1055         ndev->ethtool_ops = &fs_ethtool_ops;
1056         ndev->do_ioctl = fs_ioctl;
1057
1058         init_timer(&fep->phy_timer_list);
1059
1060         netif_carrier_off(ndev);
1061
1062         err = register_netdev(ndev);
1063         if (err != 0) {
1064                 printk(KERN_ERR DRV_MODULE_NAME
1065                        ": %s register_netdev failed.\n", ndev->name);
1066                 goto err;
1067         }
1068         registered = 1;
1069
1070
1071         return ndev;
1072
1073       err:
1074         if (ndev != NULL) {
1075
1076                 if (registered)
1077                         unregister_netdev(ndev);
1078
1079                 if (fep != NULL) {
1080                         (*fep->ops->free_bd)(ndev);
1081                         (*fep->ops->cleanup_data)(ndev);
1082                 }
1083
1084                 free_netdev(ndev);
1085         }
1086
1087         dev_set_drvdata(dev, NULL);
1088
1089         return ERR_PTR(err);
1090 }
1091
1092 static int fs_cleanup_instance(struct net_device *ndev)
1093 {
1094         struct fs_enet_private *fep;
1095         const struct fs_platform_info *fpi;
1096         struct device *dev;
1097
1098         if (ndev == NULL)
1099                 return -EINVAL;
1100
1101         fep = netdev_priv(ndev);
1102         if (fep == NULL)
1103                 return -EINVAL;
1104
1105         fpi = fep->fpi;
1106
1107         unregister_netdev(ndev);
1108
1109         dma_free_coherent(fep->dev, (fpi->tx_ring + fpi->rx_ring) * sizeof(cbd_t),
1110                           fep->ring_base, fep->ring_mem_addr);
1111
1112         /* reset it */
1113         (*fep->ops->cleanup_data)(ndev);
1114
1115         dev = fep->dev;
1116         if (dev != NULL) {
1117                 dev_set_drvdata(dev, NULL);
1118                 fep->dev = NULL;
1119         }
1120
1121         free_netdev(ndev);
1122
1123         return 0;
1124 }
1125
1126 /**************************************************************************************/
1127
1128 /* handy pointer to the immap */
1129 void *fs_enet_immap = NULL;
1130
1131 static int setup_immap(void)
1132 {
1133         phys_addr_t paddr = 0;
1134         unsigned long size = 0;
1135
1136 #ifdef CONFIG_CPM1
1137         paddr = IMAP_ADDR;
1138         size = 0x10000; /* map 64K */
1139 #endif
1140
1141 #ifdef CONFIG_CPM2
1142         paddr = CPM_MAP_ADDR;
1143         size = 0x40000; /* map 256 K */
1144 #endif
1145         fs_enet_immap = ioremap(paddr, size);
1146         if (fs_enet_immap == NULL)
1147                 return -EBADF;  /* XXX ahem; maybe just BUG_ON? */
1148
1149         return 0;
1150 }
1151
1152 static void cleanup_immap(void)
1153 {
1154         if (fs_enet_immap != NULL) {
1155                 iounmap(fs_enet_immap);
1156                 fs_enet_immap = NULL;
1157         }
1158 }
1159
1160 /**************************************************************************************/
1161
1162 static int __devinit fs_enet_probe(struct device *dev)
1163 {
1164         struct net_device *ndev;
1165
1166         /* no fixup - no device */
1167         if (dev->platform_data == NULL) {
1168                 printk(KERN_INFO "fs_enet: "
1169                                 "probe called with no platform data; "
1170                                 "remove unused devices\n");
1171                 return -ENODEV;
1172         }
1173
1174         ndev = fs_init_instance(dev, dev->platform_data);
1175         if (IS_ERR(ndev))
1176                 return PTR_ERR(ndev);
1177         return 0;
1178 }
1179
1180 static int fs_enet_remove(struct device *dev)
1181 {
1182         return fs_cleanup_instance(dev_get_drvdata(dev));
1183 }
1184
1185 static struct device_driver fs_enet_fec_driver = {
1186         .name           = "fsl-cpm-fec",
1187         .bus            = &platform_bus_type,
1188         .probe          = fs_enet_probe,
1189         .remove         = fs_enet_remove,
1190 #ifdef CONFIG_PM
1191 /*      .suspend        = fs_enet_suspend,      TODO */
1192 /*      .resume         = fs_enet_resume,       TODO */
1193 #endif
1194 };
1195
1196 static struct device_driver fs_enet_scc_driver = {
1197         .name           = "fsl-cpm-scc",
1198         .bus            = &platform_bus_type,
1199         .probe          = fs_enet_probe,
1200         .remove         = fs_enet_remove,
1201 #ifdef CONFIG_PM
1202 /*      .suspend        = fs_enet_suspend,      TODO */
1203 /*      .resume         = fs_enet_resume,       TODO */
1204 #endif
1205 };
1206
1207 static struct device_driver fs_enet_fcc_driver = {
1208         .name           = "fsl-cpm-fcc",
1209         .bus            = &platform_bus_type,
1210         .probe          = fs_enet_probe,
1211         .remove         = fs_enet_remove,
1212 #ifdef CONFIG_PM
1213 /*      .suspend        = fs_enet_suspend,      TODO */
1214 /*      .resume         = fs_enet_resume,       TODO */
1215 #endif
1216 };
1217
1218 static int __init fs_init(void)
1219 {
1220         int r;
1221
1222         printk(KERN_INFO
1223                         "%s", version);
1224
1225         r = setup_immap();
1226         if (r != 0)
1227                 return r;
1228
1229 #ifdef CONFIG_FS_ENET_HAS_FCC
1230         /* let's insert mii stuff */
1231         r = fs_enet_mdio_bb_init();
1232
1233         if (r != 0) {
1234                 printk(KERN_ERR DRV_MODULE_NAME
1235                         "BB PHY init failed.\n");
1236                 return r;
1237         }
1238         r = driver_register(&fs_enet_fcc_driver);
1239         if (r != 0)
1240                 goto err;
1241 #endif
1242
1243 #ifdef CONFIG_FS_ENET_HAS_FEC
1244         r =  fs_enet_mdio_fec_init();
1245         if (r != 0) {
1246                 printk(KERN_ERR DRV_MODULE_NAME
1247                         "FEC PHY init failed.\n");
1248                 return r;
1249         }
1250
1251         r = driver_register(&fs_enet_fec_driver);
1252         if (r != 0)
1253                 goto err;
1254 #endif
1255
1256 #ifdef CONFIG_FS_ENET_HAS_SCC
1257         r = driver_register(&fs_enet_scc_driver);
1258         if (r != 0)
1259                 goto err;
1260 #endif
1261
1262         return 0;
1263 err:
1264         cleanup_immap();
1265         return r;
1266
1267 }
1268
1269 static void __exit fs_cleanup(void)
1270 {
1271         driver_unregister(&fs_enet_fec_driver);
1272         driver_unregister(&fs_enet_fcc_driver);
1273         driver_unregister(&fs_enet_scc_driver);
1274         cleanup_immap();
1275 }
1276
1277 /**************************************************************************************/
1278
1279 module_init(fs_init);
1280 module_exit(fs_cleanup);