drivers/net/fs_enet/fs_enet-main.c

   1 /*
   2  * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
   3  *
   4  * Copyright (c) 2003 Intracom S.A.
   5  *  by Pantelis Antoniou <panto@intracom.gr>
   6  *
   7  * 2005 (c) MontaVista Software, Inc.
   8  * Vitaly Bordug <vbordug@ru.mvista.com>
   9  *
  10  * Heavily based on original FEC driver by Dan Malek <dan@embeddededge.com>
  11  * and modifications by Joakim Tjernlund <joakim.tjernlund@lumentis.se>
  12  *
  13  * This file is licensed under the terms of the GNU General Public License
  14  * version 2. This program is licensed "as is" without any warranty of any
  15  * kind, whether express or implied.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/types.h>
  21 #include <linux/string.h>
  22 #include <linux/ptrace.h>
  23 #include <linux/errno.h>
  24 #include <linux/ioport.h>
  25 #include <linux/slab.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/pci.h>
  28 #include <linux/init.h>
  29 #include <linux/delay.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/skbuff.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/mii.h>
  35 #include <linux/ethtool.h>
  36 #include <linux/bitops.h>
  37 #include <linux/fs.h>
  38 #include <linux/platform_device.h>
  39 #include <linux/phy.h>
  40
  41 #include <linux/vmalloc.h>
  42 #include <asm/pgtable.h>
  43
  44 #include <asm/pgtable.h>
  45 #include <asm/irq.h>
  46 #include <asm/uaccess.h>
  47
  48 #include "fs_enet.h"
  49
  50 /*************************************************/
  51
  52 static char version[] __devinitdata =
  53     DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")" "\n";
  54
  55 MODULE_AUTHOR("Pantelis Antoniou <panto@intracom.gr>");
  56 MODULE_DESCRIPTION("Freescale Ethernet Driver");
  57 MODULE_LICENSE("GPL");
  58 MODULE_VERSION(DRV_MODULE_VERSION);
  59
  60 int fs_enet_debug = -1;         /* -1 == use FS_ENET_DEF_MSG_ENABLE as value */
  61 module_param(fs_enet_debug, int, 0);
  62 MODULE_PARM_DESC(fs_enet_debug,
  63                  "Freescale bitmapped debugging message enable value");
  64
  65
  66 static void fs_set_multicast_list(struct net_device *dev)
  67 {
  68         struct fs_enet_private *fep = netdev_priv(dev);
  69
  70         (*fep->ops->set_multicast_list)(dev);
  71 }
  72
  73 /* NAPI receive function */
  74 static int fs_enet_rx_napi(struct net_device *dev, int *budget)
  75 {
  76         struct fs_enet_private *fep = netdev_priv(dev);
  77         const struct fs_platform_info *fpi = fep->fpi;
  78         cbd_t *bdp;
  79         struct sk_buff *skb, *skbn, *skbt;
  80         int received = 0;
  81         u16 pkt_len, sc;
  82         int curidx;
  83         int rx_work_limit = 0;  /* pacify gcc */
  84
  85         rx_work_limit = min(dev->quota, *budget);
  86
  87         if (!netif_running(dev))
  88                 return 0;
  89
  90         /*
  91          * First, grab all of the stats for the incoming packet.
  92          * These get messed up if we get called due to a busy condition.
  93          */
  94         bdp = fep->cur_rx;
  95
  96         /* clear RX status bits for napi*/
  97         (*fep->ops->napi_clear_rx_event)(dev);
  98
  99         while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
 100
 101                 curidx = bdp - fep->rx_bd_base;
 102
 103                 /*
 104                  * Since we have allocated space to hold a complete frame,
 105                  * the last indicator should be set.
 106                  */
 107                 if ((sc & BD_ENET_RX_LAST) == 0)
 108                         printk(KERN_WARNING DRV_MODULE_NAME
 109                                ": %s rcv is not +last\n",
 110                                dev->name);
 111
 112                 /*
 113                  * Check for errors.
 114                  */
 115                 if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
 116                           BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
 117                         fep->stats.rx_errors++;
 118                         /* Frame too long or too short. */
 119                         if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
 120                                 fep->stats.rx_length_errors++;
 121                         /* Frame alignment */
 122                         if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
 123                                 fep->stats.rx_frame_errors++;
 124                         /* CRC Error */
 125                         if (sc & BD_ENET_RX_CR)
 126                                 fep->stats.rx_crc_errors++;
 127                         /* FIFO overrun */
 128                         if (sc & BD_ENET_RX_OV)
 129                                 fep->stats.rx_crc_errors++;
 130
 131                         skb = fep->rx_skbuff[curidx];
 132
 133                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 134                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 135                                 DMA_FROM_DEVICE);
 136
 137                         skbn = skb;
 138
 139                 } else {
 140
 141                         /* napi, got packet but no quota */
 142                         if (--rx_work_limit < 0)
 143                                 break;
 144
 145                         skb = fep->rx_skbuff[curidx];
 146
 147                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 148                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 149                                 DMA_FROM_DEVICE);
 150
 151                         /*
 152                          * Process the incoming frame.
 153                          */
 154                         fep->stats.rx_packets++;
 155                         pkt_len = CBDR_DATLEN(bdp) - 4; /* remove CRC */
 156                         fep->stats.rx_bytes += pkt_len + 4;
 157
 158                         if (pkt_len <= fpi->rx_copybreak) {
 159                                 /* +2 to make IP header L1 cache aligned */
 160                                 skbn = dev_alloc_skb(pkt_len + 2);
 161                                 if (skbn != NULL) {
 162                                         skb_reserve(skbn, 2);   /* align IP header */
 163                                         memcpy(skbn->data, skb->data, pkt_len);
 164                                         /* swap */
 165                                         skbt = skb;
 166                                         skb = skbn;
 167                                         skbn = skbt;
 168                                 }
 169                         } else
 170                                 skbn = dev_alloc_skb(ENET_RX_FRSIZE);
 171
 172                         if (skbn != NULL) {
 173                                 skb_put(skb, pkt_len);  /* Make room */
 174                                 skb->protocol = eth_type_trans(skb, dev);
 175                                 received++;
 176                                 netif_receive_skb(skb);
 177                         } else {
 178                                 printk(KERN_WARNING DRV_MODULE_NAME
 179                                        ": %s Memory squeeze, dropping packet.\n",
 180                                        dev->name);
 181                                 fep->stats.rx_dropped++;
 182                                 skbn = skb;
 183                         }
 184                 }
 185
 186                 fep->rx_skbuff[curidx] = skbn;
 187                 CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
 188                              L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 189                              DMA_FROM_DEVICE));
 190                 CBDW_DATLEN(bdp, 0);
 191                 CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
 192
 193                 /*
 194                  * Update BD pointer to next entry.
 195                  */
 196                 if ((sc & BD_ENET_RX_WRAP) == 0)
 197                         bdp++;
 198                 else
 199                         bdp = fep->rx_bd_base;
 200
 201                 (*fep->ops->rx_bd_done)(dev);
 202         }
 203
 204         fep->cur_rx = bdp;
 205
 206         dev->quota -= received;
 207         *budget -= received;
 208
 209         if (rx_work_limit < 0)
 210                 return 1;       /* not done */
 211
 212         /* done */
 213         netif_rx_complete(dev);
 214
 215         (*fep->ops->napi_enable_rx)(dev);
 216
 217         return 0;
 218 }
 219
 220 /* non NAPI receive function */
 221 static int fs_enet_rx_non_napi(struct net_device *dev)
 222 {
 223         struct fs_enet_private *fep = netdev_priv(dev);
 224         const struct fs_platform_info *fpi = fep->fpi;
 225         cbd_t *bdp;
 226         struct sk_buff *skb, *skbn, *skbt;
 227         int received = 0;
 228         u16 pkt_len, sc;
 229         int curidx;
 230         /*
 231          * First, grab all of the stats for the incoming packet.
 232          * These get messed up if we get called due to a busy condition.
 233          */
 234         bdp = fep->cur_rx;
 235
 236         while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
 237
 238                 curidx = bdp - fep->rx_bd_base;
 239
 240                 /*
 241                  * Since we have allocated space to hold a complete frame,
 242                  * the last indicator should be set.
 243                  */
 244                 if ((sc & BD_ENET_RX_LAST) == 0)
 245                         printk(KERN_WARNING DRV_MODULE_NAME
 246                                ": %s rcv is not +last\n",
 247                                dev->name);
 248
 249                 /*
 250                  * Check for errors.
 251                  */
 252                 if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
 253                           BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
 254                         fep->stats.rx_errors++;
 255                         /* Frame too long or too short. */
 256                         if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
 257                                 fep->stats.rx_length_errors++;
 258                         /* Frame alignment */
 259                         if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
 260                                 fep->stats.rx_frame_errors++;
 261                         /* CRC Error */
 262                         if (sc & BD_ENET_RX_CR)
 263                                 fep->stats.rx_crc_errors++;
 264                         /* FIFO overrun */
 265                         if (sc & BD_ENET_RX_OV)
 266                                 fep->stats.rx_crc_errors++;
 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                         skbn = skb;
 275
 276                 } else {
 277
 278                         skb = fep->rx_skbuff[curidx];
 279
 280                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 281                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 282                                 DMA_FROM_DEVICE);
 283
 284                         /*
 285                          * Process the incoming frame.
 286                          */
 287                         fep->stats.rx_packets++;
 288                         pkt_len = CBDR_DATLEN(bdp) - 4; /* remove CRC */
 289                         fep->stats.rx_bytes += pkt_len + 4;
 290
 291                         if (pkt_len <= fpi->rx_copybreak) {
 292                                 /* +2 to make IP header L1 cache aligned */
 293                                 skbn = dev_alloc_skb(pkt_len + 2);
 294                                 if (skbn != NULL) {
 295                                         skb_reserve(skbn, 2);   /* align IP header */
 296                                         memcpy(skbn->data, skb->data, pkt_len);
 297                                         /* swap */
 298                                         skbt = skb;
 299                                         skb = skbn;
 300                                         skbn = skbt;
 301                                 }
 302                         } else
 303                                 skbn = dev_alloc_skb(ENET_RX_FRSIZE);
 304
 305                         if (skbn != NULL) {
 306                                 skb_put(skb, pkt_len);  /* Make room */
 307                                 skb->protocol = eth_type_trans(skb, dev);
 308                                 received++;
 309                                 netif_rx(skb);
 310                         } else {
 311                                 printk(KERN_WARNING DRV_MODULE_NAME
 312                                        ": %s Memory squeeze, dropping packet.\n",
 313                                        dev->name);
 314                                 fep->stats.rx_dropped++;
 315                                 skbn = skb;
 316                         }
 317                 }
 318
 319                 fep->rx_skbuff[curidx] = skbn;
 320                 CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
 321                              L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 322                              DMA_FROM_DEVICE));
 323                 CBDW_DATLEN(bdp, 0);
 324                 CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
 325
 326                 /*
 327                  * Update BD pointer to next entry.
 328                  */
 329                 if ((sc & BD_ENET_RX_WRAP) == 0)
 330                         bdp++;
 331                 else
 332                         bdp = fep->rx_bd_base;
 333
 334                 (*fep->ops->rx_bd_done)(dev);
 335         }
 336
 337         fep->cur_rx = bdp;
 338
 339         return 0;
 340 }
 341
 342 static void fs_enet_tx(struct net_device *dev)
 343 {
 344         struct fs_enet_private *fep = netdev_priv(dev);
 345         cbd_t *bdp;
 346         struct sk_buff *skb;
 347         int dirtyidx, do_wake, do_restart;
 348         u16 sc;
 349
 350         spin_lock(&fep->lock);
 351         bdp = fep->dirty_tx;
 352
 353         do_wake = do_restart = 0;
 354         while (((sc = CBDR_SC(bdp)) & BD_ENET_TX_READY) == 0) {
 355
 356                 dirtyidx = bdp - fep->tx_bd_base;
 357
 358                 if (fep->tx_free == fep->tx_ring)
 359                         break;
 360
 361                 skb = fep->tx_skbuff[dirtyidx];
 362
 363                 /*
 364                  * Check for errors.
 365                  */
 366                 if (sc & (BD_ENET_TX_HB | BD_ENET_TX_LC |
 367                           BD_ENET_TX_RL | BD_ENET_TX_UN | BD_ENET_TX_CSL)) {
 368
 369                         if (sc & BD_ENET_TX_HB) /* No heartbeat */
 370                                 fep->stats.tx_heartbeat_errors++;
 371                         if (sc & BD_ENET_TX_LC) /* Late collision */
 372                                 fep->stats.tx_window_errors++;
 373                         if (sc & BD_ENET_TX_RL) /* Retrans limit */
 374                                 fep->stats.tx_aborted_errors++;
 375                         if (sc & BD_ENET_TX_UN) /* Underrun */
 376                                 fep->stats.tx_fifo_errors++;
 377                         if (sc & BD_ENET_TX_CSL)        /* Carrier lost */
 378                                 fep->stats.tx_carrier_errors++;
 379
 380                         if (sc & (BD_ENET_TX_LC | BD_ENET_TX_RL | BD_ENET_TX_UN)) {
 381                                 fep->stats.tx_errors++;
 382                                 do_restart = 1;
 383                         }
 384                 } else
 385                         fep->stats.tx_packets++;
 386
 387                 if (sc & BD_ENET_TX_READY)
 388                         printk(KERN_WARNING DRV_MODULE_NAME
 389                                ": %s HEY! Enet xmit interrupt and TX_READY.\n",
 390                                dev->name);
 391
 392                 /*
 393                  * Deferred means some collisions occurred during transmit,
 394                  * but we eventually sent the packet OK.
 395                  */
 396                 if (sc & BD_ENET_TX_DEF)
 397                         fep->stats.collisions++;
 398
 399                 /* unmap */
 400                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 401                                 skb->len, DMA_TO_DEVICE);
 402
 403                 /*
 404                  * Free the sk buffer associated with this last transmit.
 405                  */
 406                 dev_kfree_skb_irq(skb);
 407                 fep->tx_skbuff[dirtyidx] = NULL;
 408
 409                 /*
 410                  * Update pointer to next buffer descriptor to be transmitted.
 411                  */
 412                 if ((sc & BD_ENET_TX_WRAP) == 0)
 413                         bdp++;
 414                 else
 415                         bdp = fep->tx_bd_base;
 416
 417                 /*
 418                  * Since we have freed up a buffer, the ring is no longer
 419                  * full.
 420                  */
 421                 if (!fep->tx_free++)
 422                         do_wake = 1;
 423         }
 424
 425         fep->dirty_tx = bdp;
 426
 427         if (do_restart)
 428                 (*fep->ops->tx_restart)(dev);
 429
 430         spin_unlock(&fep->lock);
 431
 432         if (do_wake)
 433                 netif_wake_queue(dev);
 434 }
 435
 436 /*
 437  * The interrupt handler.
 438  * This is called from the MPC core interrupt.
 439  */
 440 static irqreturn_t
 441 fs_enet_interrupt(int irq, void *dev_id)
 442 {
 443         struct net_device *dev = dev_id;
 444         struct fs_enet_private *fep;
 445         const struct fs_platform_info *fpi;
 446         u32 int_events;
 447         u32 int_clr_events;
 448         int nr, napi_ok;
 449         int handled;
 450
 451         fep = netdev_priv(dev);
 452         fpi = fep->fpi;
 453
 454         nr = 0;
 455         while ((int_events = (*fep->ops->get_int_events)(dev)) != 0) {
 456
 457                 nr++;
 458
 459                 int_clr_events = int_events;
 460                 if (fpi->use_napi)
 461                         int_clr_events &= ~fep->ev_napi_rx;
 462
 463                 (*fep->ops->clear_int_events)(dev, int_clr_events);
 464
 465                 if (int_events & fep->ev_err)
 466                         (*fep->ops->ev_error)(dev, int_events);
 467
 468                 if (int_events & fep->ev_rx) {
 469                         if (!fpi->use_napi)
 470                                 fs_enet_rx_non_napi(dev);
 471                         else {
 472                                 napi_ok = netif_rx_schedule_prep(dev);
 473
 474                                 (*fep->ops->napi_disable_rx)(dev);
 475                                 (*fep->ops->clear_int_events)(dev, fep->ev_napi_rx);
 476
 477                                 /* NOTE: it is possible for FCCs in NAPI mode    */
 478                                 /* to submit a spurious interrupt while in poll  */
 479                                 if (napi_ok)
 480                                         __netif_rx_schedule(dev);
 481                         }
 482                 }
 483
 484                 if (int_events & fep->ev_tx)
 485                         fs_enet_tx(dev);
 486         }
 487
 488         handled = nr > 0;
 489         return IRQ_RETVAL(handled);
 490 }
 491
 492 void fs_init_bds(struct net_device *dev)
 493 {
 494         struct fs_enet_private *fep = netdev_priv(dev);
 495         cbd_t *bdp;
 496         struct sk_buff *skb;
 497         int i;
 498
 499         fs_cleanup_bds(dev);
 500
 501         fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
 502         fep->tx_free = fep->tx_ring;
 503         fep->cur_rx = fep->rx_bd_base;
 504
 505         /*
 506          * Initialize the receive buffer descriptors.
 507          */
 508         for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
 509                 skb = dev_alloc_skb(ENET_RX_FRSIZE);
 510                 if (skb == NULL) {
 511                         printk(KERN_WARNING DRV_MODULE_NAME
 512                                ": %s Memory squeeze, unable to allocate skb\n",
 513                                dev->name);
 514                         break;
 515                 }
 516                 fep->rx_skbuff[i] = skb;
 517                 CBDW_BUFADDR(bdp,
 518                         dma_map_single(fep->dev, skb->data,
 519                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 520                                 DMA_FROM_DEVICE));
 521                 CBDW_DATLEN(bdp, 0);    /* zero */
 522                 CBDW_SC(bdp, BD_ENET_RX_EMPTY |
 523                         ((i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP));
 524         }
 525         /*
 526          * if we failed, fillup remainder
 527          */
 528         for (; i < fep->rx_ring; i++, bdp++) {
 529                 fep->rx_skbuff[i] = NULL;
 530                 CBDW_SC(bdp, (i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP);
 531         }
 532
 533         /*
 534          * ...and the same for transmit.
 535          */
 536         for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
 537                 fep->tx_skbuff[i] = NULL;
 538                 CBDW_BUFADDR(bdp, 0);
 539                 CBDW_DATLEN(bdp, 0);
 540                 CBDW_SC(bdp, (i < fep->tx_ring - 1) ? 0 : BD_SC_WRAP);
 541         }
 542 }
 543
 544 void fs_cleanup_bds(struct net_device *dev)
 545 {
 546         struct fs_enet_private *fep = netdev_priv(dev);
 547         struct sk_buff *skb;
 548         cbd_t *bdp;
 549         int i;
 550
 551         /*
 552          * Reset SKB transmit buffers.
 553          */
 554         for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
 555                 if ((skb = fep->tx_skbuff[i]) == NULL)
 556                         continue;
 557
 558                 /* unmap */
 559                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 560                                 skb->len, DMA_TO_DEVICE);
 561
 562                 fep->tx_skbuff[i] = NULL;
 563                 dev_kfree_skb(skb);
 564         }
 565
 566         /*
 567          * Reset SKB receive buffers
 568          */
 569         for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
 570                 if ((skb = fep->rx_skbuff[i]) == NULL)
 571                         continue;
 572
 573                 /* unmap */
 574                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 575                         L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 576                         DMA_FROM_DEVICE);
 577
 578                 fep->rx_skbuff[i] = NULL;
 579
 580                 dev_kfree_skb(skb);
 581         }
 582 }
 583
 584 /**********************************************************************************/
 585
 586 static int fs_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
 587 {
 588         struct fs_enet_private *fep = netdev_priv(dev);
 589         cbd_t *bdp;
 590         int curidx;
 591         u16 sc;
 592         unsigned long flags;
 593
 594         spin_lock_irqsave(&fep->tx_lock, flags);
 595
 596         /*
 597          * Fill in a Tx ring entry
 598          */
 599         bdp = fep->cur_tx;
 600
 601         if (!fep->tx_free || (CBDR_SC(bdp) & BD_ENET_TX_READY)) {
 602                 netif_stop_queue(dev);
 603                 spin_unlock_irqrestore(&fep->tx_lock, flags);
 604
 605                 /*
 606                  * Ooops.  All transmit buffers are full.  Bail out.
 607                  * This should not happen, since the tx queue should be stopped.
 608                  */
 609                 printk(KERN_WARNING DRV_MODULE_NAME
 610                        ": %s tx queue full!.\n", dev->name);
 611                 return NETDEV_TX_BUSY;
 612         }
 613
 614         curidx = bdp - fep->tx_bd_base;
 615         /*
 616          * Clear all of the status flags.
 617          */
 618         CBDC_SC(bdp, BD_ENET_TX_STATS);
 619
 620         /*
 621          * Save skb pointer.
 622          */
 623         fep->tx_skbuff[curidx] = skb;
 624
 625         fep->stats.tx_bytes += skb->len;
 626
 627         /*
 628          * Push the data cache so the CPM does not get stale memory data.
 629          */
 630         CBDW_BUFADDR(bdp, dma_map_single(fep->dev,
 631                                 skb->data, skb->len, DMA_TO_DEVICE));
 632         CBDW_DATLEN(bdp, skb->len);
 633
 634         dev->trans_start = jiffies;
 635
 636         /*
 637          * If this was the last BD in the ring, start at the beginning again.
 638          */
 639         if ((CBDR_SC(bdp) & BD_ENET_TX_WRAP) == 0)
 640                 fep->cur_tx++;
 641         else
 642                 fep->cur_tx = fep->tx_bd_base;
 643
 644         if (!--fep->tx_free)
 645                 netif_stop_queue(dev);
 646
 647         /* Trigger transmission start */
 648         sc = BD_ENET_TX_READY | BD_ENET_TX_INTR |
 649              BD_ENET_TX_LAST | BD_ENET_TX_TC;
 650
 651         /* note that while FEC does not have this bit
 652          * it marks it as available for software use
 653          * yay for hw reuse :) */
 654         if (skb->len <= 60)
 655                 sc |= BD_ENET_TX_PAD;
 656         CBDS_SC(bdp, sc);
 657
 658         (*fep->ops->tx_kickstart)(dev);
 659
 660         spin_unlock_irqrestore(&fep->tx_lock, flags);
 661
 662         return NETDEV_TX_OK;
 663 }
 664
 665 static int fs_request_irq(struct net_device *dev, int irq, const char *name,
 666                 irq_handler_t irqf)
 667 {
 668         struct fs_enet_private *fep = netdev_priv(dev);
 669
 670         (*fep->ops->pre_request_irq)(dev, irq);
 671         return request_irq(irq, irqf, IRQF_SHARED, name, dev);
 672 }
 673
 674 static void fs_free_irq(struct net_device *dev, int irq)
 675 {
 676         struct fs_enet_private *fep = netdev_priv(dev);
 677
 678         free_irq(irq, dev);
 679         (*fep->ops->post_free_irq)(dev, irq);
 680 }
 681
 682 static void fs_timeout(struct net_device *dev)
 683 {
 684         struct fs_enet_private *fep = netdev_priv(dev);
 685         unsigned long flags;
 686         int wake = 0;
 687
 688         fep->stats.tx_errors++;
 689
 690         spin_lock_irqsave(&fep->lock, flags);
 691
 692         if (dev->flags & IFF_UP) {
 693                 phy_stop(fep->phydev);
 694                 (*fep->ops->stop)(dev);
 695                 (*fep->ops->restart)(dev);
 696                 phy_start(fep->phydev);
 697         }
 698
 699         phy_start(fep->phydev);
 700         wake = fep->tx_free && !(CBDR_SC(fep->cur_tx) & BD_ENET_TX_READY);
 701         spin_unlock_irqrestore(&fep->lock, flags);
 702
 703         if (wake)
 704                 netif_wake_queue(dev);
 705 }
 706
 707 /*-----------------------------------------------------------------------------
 708  *  generic link-change handler - should be sufficient for most cases
 709  *-----------------------------------------------------------------------------*/
 710 static void generic_adjust_link(struct  net_device *dev)
 711 {
 712        struct fs_enet_private *fep = netdev_priv(dev);
 713        struct phy_device *phydev = fep->phydev;
 714        int new_state = 0;
 715
 716        if (phydev->link) {
 717
 718                /* adjust to duplex mode */
 719                if (phydev->duplex != fep->oldduplex){
 720                        new_state = 1;
 721                        fep->oldduplex = phydev->duplex;
 722                }
 723
 724                if (phydev->speed != fep->oldspeed) {
 725                        new_state = 1;
 726                        fep->oldspeed = phydev->speed;
 727                }
 728
 729                if (!fep->oldlink) {
 730                        new_state = 1;
 731                        fep->oldlink = 1;
 732                        netif_schedule(dev);
 733                        netif_carrier_on(dev);
 734                        netif_start_queue(dev);
 735                }
 736
 737                if (new_state)
 738                        fep->ops->restart(dev);
 739
 740        } else if (fep->oldlink) {
 741                new_state = 1;
 742                fep->oldlink = 0;
 743                fep->oldspeed = 0;
 744                fep->oldduplex = -1;
 745                netif_carrier_off(dev);
 746                netif_stop_queue(dev);
 747        }
 748
 749        if (new_state && netif_msg_link(fep))
 750                phy_print_status(phydev);
 751 }
 752
 753
 754 static void fs_adjust_link(struct net_device *dev)
 755 {
 756         struct fs_enet_private *fep = netdev_priv(dev);
 757         unsigned long flags;
 758
 759         spin_lock_irqsave(&fep->lock, flags);
 760
 761         if(fep->ops->adjust_link)
 762                 fep->ops->adjust_link(dev);
 763         else
 764                 generic_adjust_link(dev);
 765
 766         spin_unlock_irqrestore(&fep->lock, flags);
 767 }
 768
 769 static int fs_init_phy(struct net_device *dev)
 770 {
 771         struct fs_enet_private *fep = netdev_priv(dev);
 772         struct phy_device *phydev;
 773
 774         fep->oldlink = 0;
 775         fep->oldspeed = 0;
 776         fep->oldduplex = -1;
 777         if(fep->fpi->bus_id)
 778                 phydev = phy_connect(dev, fep->fpi->bus_id, &fs_adjust_link, 0,
 779                                 PHY_INTERFACE_MODE_MII);
 780         else {
 781                 printk("No phy bus ID specified in BSP code\n");
 782                 return -EINVAL;
 783         }
 784         if (IS_ERR(phydev)) {
 785                 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
 786                 return PTR_ERR(phydev);
 787         }
 788
 789         fep->phydev = phydev;
 790
 791         return 0;
 792 }
 793
 794
 795 static int fs_enet_open(struct net_device *dev)
 796 {
 797         struct fs_enet_private *fep = netdev_priv(dev);
 798         int r;
 799         int err;
 800
 801         /* Install our interrupt handler. */
 802         r = fs_request_irq(dev, fep->interrupt, "fs_enet-mac", fs_enet_interrupt);
 803         if (r != 0) {
 804                 printk(KERN_ERR DRV_MODULE_NAME
 805                        ": %s Could not allocate FS_ENET IRQ!", dev->name);
 806                 return -EINVAL;
 807         }
 808
 809         err = fs_init_phy(dev);
 810         if(err)
 811                 return err;
 812
 813         phy_start(fep->phydev);
 814
 815         return 0;
 816 }
 817
 818 static int fs_enet_close(struct net_device *dev)
 819 {
 820         struct fs_enet_private *fep = netdev_priv(dev);
 821         unsigned long flags;
 822
 823         netif_stop_queue(dev);
 824         netif_carrier_off(dev);
 825         phy_stop(fep->phydev);
 826
 827         spin_lock_irqsave(&fep->lock, flags);
 828         (*fep->ops->stop)(dev);
 829         spin_unlock_irqrestore(&fep->lock, flags);
 830
 831         /* release any irqs */
 832         phy_disconnect(fep->phydev);
 833         fep->phydev = NULL;
 834         fs_free_irq(dev, fep->interrupt);
 835
 836         return 0;
 837 }
 838
 839 static struct net_device_stats *fs_enet_get_stats(struct net_device *dev)
 840 {
 841         struct fs_enet_private *fep = netdev_priv(dev);
 842         return &fep->stats;
 843 }
 844
 845 /*************************************************************************/
 846
 847 static void fs_get_drvinfo(struct net_device *dev,
 848                             struct ethtool_drvinfo *info)
 849 {
 850         strcpy(info->driver, DRV_MODULE_NAME);
 851         strcpy(info->version, DRV_MODULE_VERSION);
 852 }
 853
 854 static int fs_get_regs_len(struct net_device *dev)
 855 {
 856         struct fs_enet_private *fep = netdev_priv(dev);
 857
 858         return (*fep->ops->get_regs_len)(dev);
 859 }
 860
 861 static void fs_get_regs(struct net_device *dev, struct ethtool_regs *regs,
 862                          void *p)
 863 {
 864         struct fs_enet_private *fep = netdev_priv(dev);
 865         unsigned long flags;
 866         int r, len;
 867
 868         len = regs->len;
 869
 870         spin_lock_irqsave(&fep->lock, flags);
 871         r = (*fep->ops->get_regs)(dev, p, &len);
 872         spin_unlock_irqrestore(&fep->lock, flags);
 873
 874         if (r == 0)
 875                 regs->version = 0;
 876 }
 877
 878 static int fs_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 879 {
 880         struct fs_enet_private *fep = netdev_priv(dev);
 881         return phy_ethtool_gset(fep->phydev, cmd);
 882 }
 883
 884 static int fs_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 885 {
 886         struct fs_enet_private *fep = netdev_priv(dev);
 887         phy_ethtool_sset(fep->phydev, cmd);
 888         return 0;
 889 }
 890
 891 static int fs_nway_reset(struct net_device *dev)
 892 {
 893         return 0;
 894 }
 895
 896 static u32 fs_get_msglevel(struct net_device *dev)
 897 {
 898         struct fs_enet_private *fep = netdev_priv(dev);
 899         return fep->msg_enable;
 900 }
 901
 902 static void fs_set_msglevel(struct net_device *dev, u32 value)
 903 {
 904         struct fs_enet_private *fep = netdev_priv(dev);
 905         fep->msg_enable = value;
 906 }
 907
 908 static const struct ethtool_ops fs_ethtool_ops = {
 909         .get_drvinfo = fs_get_drvinfo,
 910         .get_regs_len = fs_get_regs_len,
 911         .get_settings = fs_get_settings,
 912         .set_settings = fs_set_settings,
 913         .nway_reset = fs_nway_reset,
 914         .get_link = ethtool_op_get_link,
 915         .get_msglevel = fs_get_msglevel,
 916         .set_msglevel = fs_set_msglevel,
 917         .get_tx_csum = ethtool_op_get_tx_csum,
 918         .set_tx_csum = ethtool_op_set_tx_csum,  /* local! */
 919         .get_sg = ethtool_op_get_sg,
 920         .set_sg = ethtool_op_set_sg,
 921         .get_regs = fs_get_regs,
 922 };
 923
 924 static int fs_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 925 {
 926         struct fs_enet_private *fep = netdev_priv(dev);
 927         struct mii_ioctl_data *mii = (struct mii_ioctl_data *)&rq->ifr_data;
 928         unsigned long flags;
 929         int rc;
 930
 931         if (!netif_running(dev))
 932                 return -EINVAL;
 933
 934         spin_lock_irqsave(&fep->lock, flags);
 935         rc = phy_mii_ioctl(fep->phydev, mii, cmd);
 936         spin_unlock_irqrestore(&fep->lock, flags);
 937         return rc;
 938 }
 939
 940 extern int fs_mii_connect(struct net_device *dev);
 941 extern void fs_mii_disconnect(struct net_device *dev);
 942
 943 static struct net_device *fs_init_instance(struct device *dev,
 944                 struct fs_platform_info *fpi)
 945 {
 946         struct net_device *ndev = NULL;
 947         struct fs_enet_private *fep = NULL;
 948         int privsize, i, r, err = 0, registered = 0;
 949
 950         fpi->fs_no = fs_get_id(fpi);
 951         /* guard */
 952         if ((unsigned int)fpi->fs_no >= FS_MAX_INDEX)
 953                 return ERR_PTR(-EINVAL);
 954
 955         privsize = sizeof(*fep) + (sizeof(struct sk_buff **) *
 956                             (fpi->rx_ring + fpi->tx_ring));
 957
 958         ndev = alloc_etherdev(privsize);
 959         if (!ndev) {
 960                 err = -ENOMEM;
 961                 goto err;
 962         }
 963         SET_MODULE_OWNER(ndev);
 964
 965         fep = netdev_priv(ndev);
 966         memset(fep, 0, privsize);       /* clear everything */
 967
 968         fep->dev = dev;
 969         dev_set_drvdata(dev, ndev);
 970         fep->fpi = fpi;
 971         if (fpi->init_ioports)
 972                 fpi->init_ioports((struct fs_platform_info *)fpi);
 973
 974 #ifdef CONFIG_FS_ENET_HAS_FEC
 975         if (fs_get_fec_index(fpi->fs_no) >= 0)
 976                 fep->ops = &fs_fec_ops;
 977 #endif
 978
 979 #ifdef CONFIG_FS_ENET_HAS_SCC
 980         if (fs_get_scc_index(fpi->fs_no) >=0 )
 981                 fep->ops = &fs_scc_ops;
 982 #endif
 983
 984 #ifdef CONFIG_FS_ENET_HAS_FCC
 985         if (fs_get_fcc_index(fpi->fs_no) >= 0)
 986                 fep->ops = &fs_fcc_ops;
 987 #endif
 988
 989         if (fep->ops == NULL) {
 990                 printk(KERN_ERR DRV_MODULE_NAME
 991                        ": %s No matching ops found (%d).\n",
 992                        ndev->name, fpi->fs_no);
 993                 err = -EINVAL;
 994                 goto err;
 995         }
 996
 997         r = (*fep->ops->setup_data)(ndev);
 998         if (r != 0) {
 999                 printk(KERN_ERR DRV_MODULE_NAME
1000                        ": %s setup_data failed\n",
1001                         ndev->name);
1002                 err = r;
1003                 goto err;
1004         }
1005
1006         /* point rx_skbuff, tx_skbuff */
1007         fep->rx_skbuff = (struct sk_buff **)&fep[1];
1008         fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;
1009
1010         /* init locks */
1011         spin_lock_init(&fep->lock);
1012         spin_lock_init(&fep->tx_lock);
1013
1014         /*
1015          * Set the Ethernet address.
1016          */
1017         for (i = 0; i < 6; i++)
1018                 ndev->dev_addr[i] = fpi->macaddr[i];
1019
1020         r = (*fep->ops->allocate_bd)(ndev);
1021
1022         if (fep->ring_base == NULL) {
1023                 printk(KERN_ERR DRV_MODULE_NAME
1024                        ": %s buffer descriptor alloc failed (%d).\n", ndev->name, r);
1025                 err = r;
1026                 goto err;
1027         }
1028
1029         /*
1030          * Set receive and transmit descriptor base.
1031          */
1032         fep->rx_bd_base = fep->ring_base;
1033         fep->tx_bd_base = fep->rx_bd_base + fpi->rx_ring;
1034
1035         /* initialize ring size variables */
1036         fep->tx_ring = fpi->tx_ring;
1037         fep->rx_ring = fpi->rx_ring;
1038
1039         /*
1040          * The FEC Ethernet specific entries in the device structure.
1041          */
1042         ndev->open = fs_enet_open;
1043         ndev->hard_start_xmit = fs_enet_start_xmit;
1044         ndev->tx_timeout = fs_timeout;
1045         ndev->watchdog_timeo = 2 * HZ;
1046         ndev->stop = fs_enet_close;
1047         ndev->get_stats = fs_enet_get_stats;
1048         ndev->set_multicast_list = fs_set_multicast_list;
1049         if (fpi->use_napi) {
1050                 ndev->poll = fs_enet_rx_napi;
1051                 ndev->weight = fpi->napi_weight;
1052         }
1053         ndev->ethtool_ops = &fs_ethtool_ops;
1054         ndev->do_ioctl = fs_ioctl;
1055
1056         init_timer(&fep->phy_timer_list);
1057
1058         netif_carrier_off(ndev);
1059
1060         err = register_netdev(ndev);
1061         if (err != 0) {
1062                 printk(KERN_ERR DRV_MODULE_NAME
1063                        ": %s register_netdev failed.\n", ndev->name);
1064                 goto err;
1065         }
1066         registered = 1;
1067
1068
1069         return ndev;
1070
1071       err:
1072         if (ndev != NULL) {
1073
1074                 if (registered)
1075                         unregister_netdev(ndev);
1076
1077                 if (fep != NULL) {
1078                         (*fep->ops->free_bd)(ndev);
1079                         (*fep->ops->cleanup_data)(ndev);
1080                 }
1081
1082                 free_netdev(ndev);
1083         }
1084
1085         dev_set_drvdata(dev, NULL);
1086
1087         return ERR_PTR(err);
1088 }
1089
1090 static int fs_cleanup_instance(struct net_device *ndev)
1091 {
1092         struct fs_enet_private *fep;
1093         const struct fs_platform_info *fpi;
1094         struct device *dev;
1095
1096         if (ndev == NULL)
1097                 return -EINVAL;
1098
1099         fep = netdev_priv(ndev);
1100         if (fep == NULL)
1101                 return -EINVAL;
1102
1103         fpi = fep->fpi;
1104
1105         unregister_netdev(ndev);
1106
1107         dma_free_coherent(fep->dev, (fpi->tx_ring + fpi->rx_ring) * sizeof(cbd_t),
1108                           fep->ring_base, fep->ring_mem_addr);
1109
1110         /* reset it */
1111         (*fep->ops->cleanup_data)(ndev);
1112
1113         dev = fep->dev;
1114         if (dev != NULL) {
1115                 dev_set_drvdata(dev, NULL);
1116                 fep->dev = NULL;
1117         }
1118
1119         free_netdev(ndev);
1120
1121         return 0;
1122 }
1123
1124 /**************************************************************************************/
1125
1126 /* handy pointer to the immap */
1127 void *fs_enet_immap = NULL;
1128
1129 static int setup_immap(void)
1130 {
1131         phys_addr_t paddr = 0;
1132         unsigned long size = 0;
1133
1134 #ifdef CONFIG_CPM1
1135         paddr = IMAP_ADDR;
1136         size = 0x10000; /* map 64K */
1137 #endif
1138
1139 #ifdef CONFIG_CPM2
1140         paddr = CPM_MAP_ADDR;
1141         size = 0x40000; /* map 256 K */
1142 #endif
1143         fs_enet_immap = ioremap(paddr, size);
1144         if (fs_enet_immap == NULL)
1145                 return -EBADF;  /* XXX ahem; maybe just BUG_ON? */
1146
1147         return 0;
1148 }
1149
1150 static void cleanup_immap(void)
1151 {
1152         if (fs_enet_immap != NULL) {
1153                 iounmap(fs_enet_immap);
1154                 fs_enet_immap = NULL;
1155         }
1156 }
1157
1158 /**************************************************************************************/
1159
1160 static int __devinit fs_enet_probe(struct device *dev)
1161 {
1162         struct net_device *ndev;
1163
1164         /* no fixup - no device */
1165         if (dev->platform_data == NULL) {
1166                 printk(KERN_INFO "fs_enet: "
1167                                 "probe called with no platform data; "
1168                                 "remove unused devices\n");
1169                 return -ENODEV;
1170         }
1171
1172         ndev = fs_init_instance(dev, dev->platform_data);
1173         if (IS_ERR(ndev))
1174                 return PTR_ERR(ndev);
1175         return 0;
1176 }
1177
1178 static int fs_enet_remove(struct device *dev)
1179 {
1180         return fs_cleanup_instance(dev_get_drvdata(dev));
1181 }
1182
1183 static struct device_driver fs_enet_fec_driver = {
1184         .name           = "fsl-cpm-fec",
1185         .bus            = &platform_bus_type,
1186         .probe          = fs_enet_probe,
1187         .remove         = fs_enet_remove,
1188 #ifdef CONFIG_PM
1189 /*      .suspend        = fs_enet_suspend,      TODO */
1190 /*      .resume         = fs_enet_resume,       TODO */
1191 #endif
1192 };
1193
1194 static struct device_driver fs_enet_scc_driver = {
1195         .name           = "fsl-cpm-scc",
1196         .bus            = &platform_bus_type,
1197         .probe          = fs_enet_probe,
1198         .remove         = fs_enet_remove,
1199 #ifdef CONFIG_PM
1200 /*      .suspend        = fs_enet_suspend,      TODO */
1201 /*      .resume         = fs_enet_resume,       TODO */
1202 #endif
1203 };
1204
1205 static struct device_driver fs_enet_fcc_driver = {
1206         .name           = "fsl-cpm-fcc",
1207         .bus            = &platform_bus_type,
1208         .probe          = fs_enet_probe,
1209         .remove         = fs_enet_remove,
1210 #ifdef CONFIG_PM
1211 /*      .suspend        = fs_enet_suspend,      TODO */
1212 /*      .resume         = fs_enet_resume,       TODO */
1213 #endif
1214 };
1215
1216 static int __init fs_init(void)
1217 {
1218         int r;
1219
1220         printk(KERN_INFO
1221                         "%s", version);
1222
1223         r = setup_immap();
1224         if (r != 0)
1225                 return r;
1226
1227 #ifdef CONFIG_FS_ENET_HAS_FCC
1228         /* let's insert mii stuff */
1229         r = fs_enet_mdio_bb_init();
1230
1231         if (r != 0) {
1232                 printk(KERN_ERR DRV_MODULE_NAME
1233                         "BB PHY init failed.\n");
1234                 return r;
1235         }
1236         r = driver_register(&fs_enet_fcc_driver);
1237         if (r != 0)
1238                 goto err;
1239 #endif
1240
1241 #ifdef CONFIG_FS_ENET_HAS_FEC
1242         r =  fs_enet_mdio_fec_init();
1243         if (r != 0) {
1244                 printk(KERN_ERR DRV_MODULE_NAME
1245                         "FEC PHY init failed.\n");
1246                 return r;
1247         }
1248
1249         r = driver_register(&fs_enet_fec_driver);
1250         if (r != 0)
1251                 goto err;
1252 #endif
1253
1254 #ifdef CONFIG_FS_ENET_HAS_SCC
1255         r = driver_register(&fs_enet_scc_driver);
1256         if (r != 0)
1257                 goto err;
1258 #endif
1259
1260         return 0;
1261 err:
1262         cleanup_immap();
1263         return r;
1264
1265 }
1266
1267 static void __exit fs_cleanup(void)
1268 {
1269         driver_unregister(&fs_enet_fec_driver);
1270         driver_unregister(&fs_enet_fcc_driver);
1271         driver_unregister(&fs_enet_scc_driver);
1272         cleanup_immap();
1273 }
1274
1275 /**************************************************************************************/
1276
1277 module_init(fs_init);
1278 module_exit(fs_cleanup);