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