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